Sandvik Raise Boring Heads User manual

Raise Boring Heads are used for drilling large holes in rock. They are available in different types, including integral, segmented and extendable heads. They are designed for drilling ore passes, ventilation raises, penstocks etc., and also for civil construction applications such as cable tunnels, escape tunnels, and sewage tunnels. Sandvik reaming heads are designed with bolted components for improved flexibility and ease of service and assembly. This manual provides instructions on how to mount, maintain and operate the Raise Boring Heads.

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Raise Boring Heads

User manual

R a i s e b o r i n g h e a d s – user manual

Contents

Different raise boring methods ............................................. 4

General recommended drilling parameters .......................... 6

Mounting of saddles ............................................................... 8

Gauge saddle system to reduce reamer diameter ................ 10

Mounting of stem .................................................................... 11

Mounting of cutters ................................................................ 13

Cutter positioning .................................................................... 14

Cutter positions ........................................................................ 17

Mounting of segments ............................................................ 20

Segment positioning ................................................................ 22

Transport dimensions and weights ....................................... 26

Inspection and service ............................................................. 30

Removal of stem ...................................................................... 31

Wear pad replacement ............................................................. 32

Re-greasing of cutters ............................................................. 33

Seal replacement ....................................................................... 35

Reports ...................................................................................... 36

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R a i s e b o r i n g h e a d s – user manual

Raise boring methods

Raise boring

• Access on two rock faces.

• Ø 0.6 – 6 m range.

• Used for ore passes, ventilation raises, penstocks etc.

• Drill pipes under tension.

Horisontal boring

• Access on two rock faces.

• Ø 0.6 – 4.5 m range.

• Used in civil construction in urban areas ex. cable tunnel, escape tunnels, sewage tunnels etc.

• Rock stability important.

• Drill pipes under tension.

Blind boring

• Access on one rock face.

• Ø 0.6 – 1.8 m range.

• Used for slot raises, ore passes, manways.

• Drill pipes under compression.

• Needs drill pipe stabilisation.

Down boring with pre-drilled pilot hole

• Access on one rock face and an opening below.

• Ø 0.6 – 1.8 m range.

• Used for drilling large ﬁll holes.

• Drill pipes under compression.

• Needs drill pipe stabilisation.

R a i s e b o r i n g h e a d s – user manual

General recommended reaming parameters

Max recommended operating cutter load ......27 tonnes (60 000 Lbs)

Max recommended reaming head speed ........see graph below

The net operating cutter load is chosen depending on machine/ drill pipe capacity and rock characteristics.

Increase the cutter load ≤ max cutter load and/or the machine/ drill pipe capacity limit as long as increased load results in increased rate of penetration.

The reaming head speed (RPM) is chosen depending on reaming head diameter and rock characteristics.

Utilise the optimum (fastest) RPM the rock formation allows ≤ max recommended reaming head speed together with optimum net cutter load.

Reduce the RPM before reducing the cutter load.

Cutter maintenance

The raise boring cutter bearings are operating under extreme conditions, exposed to constant high operating loads, varying degree of uncontrolled shock loads in combination with high temperatures.

It is of vital importance to use the recommended type of lubricant suitable for these conditions and to relubricate the cutters on a regular basis in order to obtain an optimum cutter service life.

The interval between re-greasing needs to be more frequent with increased temperature as the lubricant properties are affected by increased operating temperatures.

See page 33 for the re-greasing instruction.

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R a i s e b o r i n g h e a d s – user manual

General recommended pilot drilling parameters

Max recommended operating bit load ............3 tonnes (6 600 Lbs) x bit diameter in inches

Max recommended speed .................................60 RPM

The net bit load and drilling speed (RPM) is chosen depending on rock characteristics ≤ max recommended bit load and RPM.

Utilise the highest RPM the rock formation and the machine allows ≤ max recommended bit RPM together with the correct bit load for optimum rate of penetration and bit service life.

Reduce the RPM before reducing the bit load.

For optimum performance use sufficient flushing to clean the hole and avoid regrinding of cuttings. Use min 800 litres/min of water for efficient flushing.

General information for Sandvik pilot bits

Part no Bit type Diameter Weight Pin connection Max. rec. bit load Rec. drilling speed mm inch Kg Lbs API reg Kg Lbs RPM

7006-7229-25XXX SCMH 229 9 45 100 Ø 4 1/2"

7006-7251-25XXX SCMH 251 9 7/8 62 137 Ø 6 5/8"

7006-7279-25XXX SCMH 279 11 75 165 Ø 6 5/8"

7006-7311-25XXX SCMH 311 12 1/4 100 220 Ø 6 5/8"

7006-7349-25XXX SCMH 349 13 3/4 120 164 Ø 6 5/8"

7006-7381-25XXX SCMH 381 15 160 353 Ø 7 5/8"

27 000 59 470 30–60

29 600 65 200 30–60

33 000 72 690 30–60

36 750 80 950 30–60

41 250 90 860

45 000 99 120

30–60

Note. Bit type SCMH is a selected bit for all rock formation. Approx. IADC code is 725.

R a i s e b o r i n g h e a d s – user manual

Sandvik reaming heads

The Sandvik reaming heads are available in different types:

Integral heads ex. CRH10D

Segmented heads ex. CRH10SD

Extendable heads ex. CRH10E

The ﬁgure in the name represents the reaming head diameter in feet (CRH10D=Ø 10′). Designs for other applications are available ex. blind boring up or down and for horizontal boring.

Segmented heads are used when reduced transport dimension and weight is required. Extendable heads are used for increased ﬂexibility to drill different diameters using the same base head. All Sandvik reaming heads have bolted components for improved ﬂexibility and ease of service and assembly.

The reaming heads are designed with different size of centre hole in order to ﬁt stems for different pilot hole sizes. Part- and serial numbers are welded on the side of the reamer as a reamer ID.

Integral head

CRH10D

Segmented head

CRH10SD

Extendable head

CRH10E

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R a i s e b o r i n g h e a d s – user manual

Mounting of saddles

The positions are marked on the side of the head frame. If there are two position marks, the upper one refers to the position nearest the head centre.

Dowel pins locate the saddles in the correct position.

Note. Do not attach the saddles for position 1 and 2 before the stem is mounted. All bolts, nuts and contact surfaces must be ﬂat, cleaned and oiled before mounting.

Tighten the bolts crosswise to 2/3 of full torque

(≈800 Nm).

Finish by tighten to full strength 1200 Nm.

Always use new bolts and nuts, even when re- assembling.

The

Nord-lock washers are reusable.

Bolt 7008-9134-01

Lock washer

7008-9135-01

Nut 7008-9135

8

Example of tool combination

R a i s e b o r i n g h e a d s – user manual

Mounting of saddles

Different saddle types are used depending on positioning and the reaming head type. The most frequent dressings as per the illustration below. The part numbers are 7008-

2XXX (some additional saddles modiﬁed for small diameters reaming heads are not shown below). The number of the different types varies with the reaming head diameter and type.

A new and improved gauge saddle system is implemented on all “D” type reaming heads to make it possible to reduce the reamer diameter by changing the gauge saddles only. See page 10 for more detailed information.

A special inner saddle, 7008-2013, is used to move cutter in position 1 closer to the pilot hole when required and is used to keep a maximum spacing to obtain efﬁcient spalling into the pilot hole. (See illustration below).

Saddle 7008-2013 is required in position 1 when :

- Ø 9 / 9 7/8″ stem is used in reaming heads with 340 mm stem fit,

- Ø 12 1/4″ stem is used in reaming heads with Ø 360 mm stem fit (exception CRH10SE),

- Ø 13 3/4″ stem is used in reaming heads with Ø 390 mm stem fit (exception CRH12E).

Integral & segmented heads

-2007 -2005 -2006

“D” type heads -2024 -2008 -2005 -2006

CRH 12E

-2030 -2008 -2005 -2006

Use saddle 7008-2013 to move cutter in pos.1

closer to the pilot hole.

-2006

-2013

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R a i s e b o r i n g h e a d s – user manual

Mounting of saddles

Gauge saddle system with reduced reamer diameter option

The gauge saddle system on “D”-type reaming heads makes it possible to reduce the reamer diameter in two steps by changing the gauge saddles only (see illustrations).

This option is valid on all Sandvik reaming heads that takes gauge saddles type 7008-2024 or 7008-2030. This option can be used in a long raise with heavy gauge button wear and makes it easier to reach the rock face again after lowering the reaming head for any service. The “D”-type gauge saddles have different part numbers and markings

(see table and illustrations) in order to reduce the risk of mixing different types on the same reamer.

Diameter Saddle step No part No

III

Marking on saddle side

7008-2024 ○ – one hole drilled

7008-2025 ○○ – two holes drilled

7008-2026 ○○○ – three holes drilled

7008-2030 ○ – one hole drilled

7008-2031 ○○ – two holes drilled

7008-2032 ○○○ – three holes drilled

STEP 1 D

GAUGE SADDLE 7008-2024 or -2030

Marking STEP I

STEP 2 D - 21 mm

GAUGE SADDLE 7008-2025 or -2031

Marking STEP II

STEP 3 D - 42 mm

GAUGE SADDLE 7008-2026 or -2032

Marking STEP III

Important!

Make sure to use four gauge saddles of the same type (same part no and marking) together on the reamer at all times to keep the correct proﬁle.

Mounting of stem

R a i s e b o r i n g h e a d s – user manual

Place the head on its side.

Clean the centre hole. Use a suitable solvent to remove the rust protection. Apply a lot of grease before ﬁtting the stem.

Insert the stem. Put a rod through the stem for easier handling. Clean and put a lot of grease on the inlet part of the stem. Use ordinary machine grease (0.5 kg).

Push the stem into position.

Oil the bolts. Pre-tighten the bolt crosswise to 800 Nm.

Tighten to full torque 1200 Nm.

Bolt 7008-9134-01

Lock washer

7008-9135-01

Clean the O-ring groove in the retainer ring and insert the

O-ring.

Nut 7008-9135

➛

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R a i s e b o r i n g h e a d s – user manual

Mounting of stem

6 7

Clean the seal seat. Slide the V-ring over the top of the stem and push it into position.

Note. Do not use the V-ring in

reaming head CRH3 and CRH4.

O-ring

Apply silicone sealant on top of the V-ring around the stem.

Lower the retainer ring over the stem into position. Make sure both seals are properly seated.

V-ring

Tighten the bolts cross-wise until the retainer ring is seated.

Make-up torque 220 Nm.

Bolt 7008-9137

12

Mount the saddles in position 1 and 2 (see picture on page

8). The head assembly is now complete.

Seal retainer

Part No.

7008-9380

7008-9381

7008-9398

Stem ﬁt “dia”, mm

340

360

390

Mounting of cutters

R a i s e b o r i n g h e a d s – user manual

1 2

The positions are marked on the side of the head frame. If there are two position marks, the upper one refers to the position nearest the head centre.

Bolt 7008-9119

Cutter

Saddle

Nord-Lock washer

7008-4341-19

Nut 7008-9120

Put some oil on the bolt before tightening.

Lift the cutters into position. See table on page 14-16 for correct positioning.

Tighten to 300 Nm.

Button row overlapping

On all Sandvik reaming heads there are button rows that are tracking (overlapping).

This feature (overlapping) can be used if there is a CMR41 cutter with button row No. 1 damaged or a CMR52 cutter with button row No. 1 or 5 damaged.

Mount them in overlapping positions to let the cutter next to it (outside or inside) without damaged button rows cut the rock in this track.

Row 1

CMR 41

Row 5

Row 1

CMR 52

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R a i s e b o r i n g h e a d s – user manual

Mounting of cutters

The cutters are to be placed in different positions, depending on which spacing is required.

25,5 mm spacing is recommended for medium to hard rock, 51 mm spacing is recommended for soft rock.

Cutter positioning on integral- and segmented heads

Reaming head type

CRH 2

CRH 3*

CRH 3

CRH 3**

CRH 4

CRH 5

CRH 6/6S

CRH 7/7S

CRH 8/8S/8D/8L

CRH 9L

CRH 10D/10SD

Head dia. mm

1524

1829

2134

2440

2749

3048

660

950

1060

1084*

1420

No. of Type of cutters cutter

CMR 41

CMR 52

CMR 41

CMR 52

CMR 41

CMR 52

CMR 41

CMR 52

CMR 41

CMR 52

CMR 41

CMR 52

CMR 41

CMR 52

CMR 41

CMR 52

CMR 41

CMR 52

CMR 41-27

CMR 52-27

CMR 41

CMR 52

Position

25.5 mm spacing

1, 3

2, 4

1, 3

2, 4

1, 3

2, 4

1, 3, 5

2, 4, 6

1, 5, 7

2, 3, 4, 6, 8

1, 3, 5, 7, 9

2, 4, 6, 8, 10

1, 3, 5, 7, 9, 11

2, 4, 6, 8, 10, 12

1, 3, 5, 7, 9, 11, 13

2, 4, 6, 8, 10, 12, 14

1, 3, 5, 7, 9, 11, 13

2, 4, 6, 8, 10, 12, 14

1, 3, 5, 7, 9, 11, 13, 15

2, 4, 6, 8, 10, 12, 14, 16

Position

51 mm spacing

1, 2

3, 4

1, 2

3, 4

1, 2

3, 4

1, 2

3, 4, 5, 6

1, 2, 3, 5, 6, 7, 8

3, 4, 5, 6

1, 2, 7, 8, 9, 10

3, 4, 5, 6, 7, 8

1, 2, 9, 10, 11, 12

3, 4, 5, 6, 7, 8, 9, 10

1, 2, 11, 12, 13, 14

3, 4, 5, 6, 7, 8, 9, 10

1, 2, 11, 12, 13, 14

5, 6, 7, 8, 9, 10, 11, 12

1, 2, 3, 4, 13, 14, 15, 16

Note! Cutter positioning when saddle 7008-2013 is used in position 1 (when a Ø 9″, 9 7/8″ stem is used in a reaming head with Ø 340 mm stem ﬁt or when a Ø 12 1/4″ stem is used in a reaming head with Ø 360 mm stem fit):

25,5 mm spacing: pos. 1, CMR 52; pos. 2, CMR 52.

51 mm spacing: pos. 1, CMR 52; pos. 2, CMR 41.

For cutter mounting of other Sandvik cutter types, consult your local Sandvik representative.

* CRH 3 Ø 950 mm, part number 7008-1009-30, is designed for 7 7/8″ stem only!

** CRH 3 Ø 1084 mm, part number 7008-1311-30, is designed for 9″ or 9 7/8″ stems and CMR 41-27 / CMR 52-27 cutters only!

R a i s e b o r i n g h e a d s – user manual

Mounting of cutters

The cutters are to be placed in different positions, depending on which spacing is required.

25,5 mm spacing is recommended for medium to hard rock, 51 mm spacing is recommended for soft rock.

Cutter positioning on extendable heads

CRH 10E

Reamer base 7008-1031-20, Ø360 stem ﬁt and 7008-1331-20, Ø390 stem ﬁt

Position

51 mm spacing

Reaming head type

Head No. of Type of Position dia. mm cutters cutter 25.5 mm spacing

CRH 10E

3130

3500

3824

CMR 41

CMR 52

CMR 41

CMR 52

CMR 41

CMR 52

1, 3, 5, 7, 9, 11, 13, 15

2, 4, 6, 8, 10, 12, 14, 16

1, 3, 5, 7, 9, 11, 14, 17, 19

2, 4, 6, 8, 10, 12, 16, 18, 20

1, 3, 5, 7, 9, 11, 14, 17, 19, 21

2, 4, 6, 8, 10, 12, 16, 18, 20, 22

3, 4, 5, 6, 7, 8, 9, 10

1, 2, 11, 12, 13, 14, 15, 16

3, 4, 5, 6, 7, 8, 9, 10

1, 2, 11, 12, 14, 16, 17, 18, 19, 20

3, 4, 5, 6, 7, 8, 9, 10, 11, 12

1, 2, 14, 16, 17, 18, 19, 20, 21, 22

CRH 10ED

Reamer base 7008-1440-20, Ø360 stem ﬁt and 7008-1340-20, Ø390 stem ﬁt

Reaming Head No. of Type of Position head type dia. cutters cutter 25.5 mm spacing mm

CRH 10ED 3500

CRH 10ED 3687

CRH 10ED 3824

CRH 10ED 4042

CMR 41

CMR 52

CMR 41

CMR 52

CMR 41

CMR 52

CMR 41

CMR 52

1, 3, 5, 7, 9, 11, 13B, 15,17

2, 4, 6, 8, 10, 12, 14B, 16,18

1, 3, 5, 7, 9, 11, 13, 15, 17, 19

2, 4, 6, 8, 10, 12, 14, 16, 18, 20

Position

51 mm spacing

3, 4, 5, 6, 7, 8, 9, 10

1, 2, 11, 12, 13B, 14B, 15, 16,17,18

3, 4, 5, 6, 7, 8, 9, 10,11,12

1, 2, 13, 14, 15, 16, 17, 18, 19, 20

1, 3, 5, 7, 9, 11, 13B, 15, 17, 19

2, 4, 6, 8, 10, 12,14B, 16, 18, 20

3, 4, 5, 6, 7, 8, 9, 10, 11, 12

1, 2, 13B, 14B, 15, 16, 17, 18, 19, 20

1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21 3, 4, 5, 6, 7, 8, 9, 10, 11, 12

2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22 1, 2,13, 14, 15, 16, 17, 18, 19, 20, 21, 22

CRH 10SE

Reamer base 7008-1630-20, Ø360 stem ﬁt

Reaming Head No. of Type of Position head type dia. cutters cutter 25.5 mm spacing mm

CRH 10SE

3047

3372

3696

CMR 41

CMR 52

CMR 41

CMR 52

CMR 41

CMR 52

1, 3, 5, 7, 9, 11, 13, 15

2, 4, 6, 8, 10, 12, 14, 16

1, 3, 5, 7, 9, 11, 13, 15, 17

2, 4, 6, 8, 10, 12, 14, 16, 18

1, 3, 5, 7, 9, 11, 13, 15, 17, 19

2, 4, 6, 8, 10, 12, 14, 16, 18, 20

Position

51 mm spacing

3, 4, 5, 6, 7, 8, 9, 10

1, 2, 11, 12, 13, 14, 15, 16

3, 4, 5, 6, 7, 8, 9, 10

1, 2, 11, 12, 13, 14, 15, 16, 17, 18

3, 4, 5, 6, 7, 8, 9, 10, 11, 12

1, 2, 13, 14, 15, 16, 17, 18, 19, 20

Note!

Cutter positioning when saddle 7008-2013 is used in position 1 (when a Ø 12 1/4″ stem is used in a reaming head with Ø

360 mm stem ﬁt with exception for CRH10SE or when a Ø 13 3/4″ stem is used in a reaming head with Ø 390 mm stem fit with exception for CRH12SE):

25,5 mm spacing: pos. 1, CMR 52; pos. 2, CMR 52.

51 mm spacing: pos. 1, CMR 52; pos. 2, CMR 41.

For cutter mounting of other Sandvik cutter types, consult your local Sandvik representative.

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R a i s e b o r i n g h e a d s – user manual

Mounting of cutters

The cutters are to be placed in different positions, depending on which spacing is required.

25,5 mm spacing is recommended for medium to hard rock, 51 mm spacing is recommended for soft rock.

Cutter positioning on extendable heads

CRH 12E

Reamer base 7008-1338-20, Ø390 stem ﬁt

Reaming Head No. of Type of Position head type dia. cutters cutter 25.5 mm spacing mm

Position

51 mm spacing

3534

3840

4146

4500

5000

5100

5520

5876

CRH 12E

CMR 41

CMR 53

CMR 41

CMR 52

CMR 41

CMR 52

CMR 41

CMR 52

CMR 41

CMR 52

CMR 41

CMR 52

30 (32) CMR 41

CMR 52

32 (36) CMR 41

CMR 52

1, 3, 5, 7, 9, 11, 13, 15, 17

2, 4, 6, 8, 10, 12, 14, 16, 18

1, 3, 5, 7, 9, 11, 13, 15, 17, 19

2, 4, 6, 8, 10, 12, 14, 16, 18, 20

3, 4, 5, 6, 7, 8, 9, 10

1, 2, 11, 12, 13, 14, 15, 16, 17, 18

3, 4, 5, 6, 7, 8, 9, 10, 11, 12

1, 2, 13, 14, 15, 16, 17, 18, 19, 20

1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21 3, 4, 5, 6, 7, 8, 9, 10, 11, 12

2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22 1, 2, 13, 14, 15, 16, 17, 18, 19, 20, 21, 22

1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14

2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 24 1, 2, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24

1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14

2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 1, 2, 15, 16, 17, 18, 19, 20, 21, 22, 23,

24, 26 24, 25, 26

1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14

2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 1, 2, 15, 16, 17, 18, 19, 20, 21, 22, 23,

24, 26 24, 25, 26

1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16

25, 27, 29, (31)

2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 1, 2, 17, 18, 19, 20, 21, 22, 23, 24, 25,

24, 26, 28, 30, (32) 26, 27, 28, 29, 30, (31), (32)

1, 3, 5, 7, 9, 11, 13, 15, 17, 19, 21, 23, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16,

25, 27, (29), (31), 33, 35 17, 18

2, 4, 6, 8, 10, 12, 14, 16, 18, 20, 22, 1, 2, 19, 20, 21, 22, 23, 24, 25, 26, 27,

24, 26, 28, (30), (32), 34, 36 28, (29), (30), (31), (32), 33, 34, 35, 36

For cutter mounting of other Sandvik cutter types, consult your local Sandvik representative.

Cutter positions in parantheses ( X ), are for optional use, when heavy gauge wear is expected.

Mounting of cutters

CRH 2

Ø 660/26

″

1 2

CRH 3

Ø 950/37

″

Ø 1060/42

″

Ø 1084/43

″

3 4

CRH 4

Ø 1420/56

″

R a i s e b o r i n g h e a d s – user manual

CRH 5

Ø 1524/60

″

CRH 6

Ø 1829/72

″

CRH 6S

Ø 1829/72

″

CRH 8D

Ø 2447/96

″

CRH 7

Ø 2134/84

″

CRH 8S

Ø 2440/96

″

CRH 7S

Ø 2134/84

″

CRH 8/8L

Ø 2440/96

″

CRH 9L

Ø 2749/108

″

CRH 10D

Ø 3094/122

″

CRH 10SD

Ø 3094/122

″

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R a i s e b o r i n g h e a d s – user manual

Mounting of cutters

CRH 10E

Ø 3130/123

″

Ø 3500/138

″

Ø 3824/151

″

CRH 10ED

Ø 3500/138

″

13B

14B 11

Ø 3824/151

″

13B

14B 11

Ø 3687/145

″

Ø 4042/159

″

CRH 10SE

Ø 3047/120

″

Ø 3372/133

″

Ø 3696/146

″

R a i s e b o r i n g h e a d s – user manual

Mounting of cutters

CRH 12E

Ø 3534/139

″

Ø 3840/151

″

Ø 4146/163

″

Ø 4500/177

″

Ø 5000/197

″

Ø 5100/201

″

Ø 5520/217

″

27 24

23 29

Ø 5876/231

″

18 12

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R a i s e b o r i n g h e a d s – user manual

Mounting of segments

CRH 6S, 7S, 8S, 10SD

CRH 10E, 10ED, 10SE

Segmented heads are designed in order to facilitate transportation through narrow openings. The reamer base is transported with the segments dismounted until the collaring site is reached.

Reaming head type

CRH 6S

CRH 7S

CRH 8S

CRH 10SD

Base head part no.

Segment part no.

No. of cutters

7008-1418-21 7008-2101-20 10

7008-1421-21 7008-2101-20 12

7008-1424-21 7008-2101-20 14

7008-1831-21 7008-2142-20 16

1 2

Segment

Reamer base

Clean all contact surfaces. Oil bolts, nuts, wedge and slotwedge. Hook the segment on to the head as shown. Start to tighten the upper wedge joint.

Fit the upper wedge.

Bolt 7008-9134-01

7008-9134

Lock washer

7008-9135-01

20

Fit the slot wedge. Tighten all bolt joints to 2/3 torque

(≈800 Nm). Tighten to full torque 1200 Nm. Begin with upper wedge. Repeat on slot-wedge.

Segment part number: 7008-XXXX-YY ex: 7008-2109-20 (without saddles)

7008-2109-30 (with saddles)

Nut 7008-9135

Complete the segment assembly by tightening the bolt/nut joints. Start with 2/3 torque (≈800 Nm). Tighten to full torque 1200 Nm.

Example of tool combination see page 8.

R a i s e b o r i n g h e a d s – user manual

Mounting of segments

Segment positioning on CRH 10E

Reamer base 7008-1031-20, Ø360 stem ﬁt and 7008-1331-20, Ø390 stem ﬁt

Reaming Head head type dia. mm

No. of cutters

No. of Segment segments part number

Segment part number

CRH 10E 3130 16 base only

CRH 10E

3500

3824

2 + 2

2 + 2 + 2

7008-2109-20

7008-2110-20

7008-2110-20 7008-2111-20

Segment positioning on CRH 10ED

Reamer base 7008-1440-20, Ø360 stem ﬁt and 7008-1340-20, Ø390 stem ﬁt

Reaming Head head type dia. mm

No. of cutters

No. of Segment segments part number

Segment part number

CRH 10ED 3500

CRH 10ED 3687

CRH 10ED 3824

CRH 10ED 4042

2 + 2

2 + 2 + 2

2 + 2

7008-2109-20

7008-2152-20

7008-2109-20

7008-2144-20

7008-2110-20

7008-2153-20

7008-2110-20

7008-2145-20

7008-2111-20

Segment positioning on CRH 10SE

Reamer base 7008-1630-20, Ø360 stem ﬁt

Reaming Head head type dia. mm

No. of cutters

No. of Segment segments part number

CRH 10SE 3047 16 2 7008-2134-20

CRH 10SE 3372

CRH 10SE 3696

2 + 2

2 + 2 + 2

7008-2135-20

Segment part number

7008-2136-20

7008-2136-20 7008-2138-20

21

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R a i s e b o r i n g h e a d s – user manual

Mounting of segments

Segment positioning

CRH 10E

Ø 3130

Ø 3500

CRH 10ED

Ø 3500

-2109

13B

-2110

14B

-2111

Ø 3687

-2109

-2110

Ø 3824

-2153

-2152

Ø 3824

Ø 4042 14

14B 11

13B

-2110

-2109

-2111

-2144

-2110

-2109

-2145

CRH 10SE

-2136

-2134

Ø 3047 Ø 3372

Ø 3696

-2135

-2136

-2138

R a i s e b o r i n g h e a d s – user manual

Mounting of segments

CRH 12E

The CRH 12E system is a user friendly design which facilitates transportation through narrow openings and substancially reduces the time for assembly.

The reamer base is transported with the segments dismounted until the collaring site is reached.

Reamer base

Segments

Bolt 7008-9134-01

Lock washer

7008-9135-01

Clean all contact surfaces, oil bolts, nuts and wedges. Hook the segments on to the head as shown. Start to tighten the upper wedge joints.

Nut

7008-9135

Begin with the wedge in the middle and work your way outwards. Tighten the bolts to 2/3 torque (800 Nm).

Continue with the bolt joints on the sides and at the bottom of the segments. Tighten to 2/3 torque(800 Nm).

Tighten to full torque (1200 Nm). Use the same sequense as when tightening to 2/3 torque.

Use the slot-wedge bolts if it is impossible to mount the bolts at the bottom of the segments.

Example of tool combination see page 8.

23

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R a i s e b o r i n g h e a d s – user manual

Mounting of segments

Segment positioning on CRH 12E

Reamer base 7008-1338-20, Ø390 stem ﬁt

Reaming Head head type dia. mm

No. of cutters

No. of Segment (small) segments part number

CRH 12E

3534

3840

4146

4500

5000

5100

5520

5876

30 (32)

32 (36)

2 + 2

7008-2150-20

7008-2161-20

7008-2149-20

7008-2147-20

7008-2159-20

7008-2154-20

7008-2156-20

Segment (large) part number

7008-2164-20

7008-2151-20

7008-2162-20

7008-2148-20

7008-2146-20

7008-2160-20

7008-2155-20

7008-2158-20

R a i s e b o r i n g h e a d s – user manual

Mounting of segments

CRH 12E

Ø 3534

-2164

-2150

Ø 3840

-2151

13 19

-2150

Ø 4146

-2162

-2161

Ø 4500

18 12

-2148

-2149

Ø 5520

-2155

27 24

-2154

23 29

Ø 5000

-2146

-2147

Ø 5100

-2160

-2159

Ø 5876

18 12

-2158

-2156

25

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R a i s e b o r i n g h e a d s – user manual

Transport dimensions and weights

Integral reaming heads

Note. Weights as noted in tables are only to be used as a guide.

Reaming head type

Transport dimensions, mm

A B C D

Weight Weight complete incl. saddles incl. saddles & stem kg kg

CRH 2

CRH 3

CRH 4

CRH 5

CRH 6

CRH 7

CRH 8

CRH 8D

CRH 8L

CRH 9

CRH 10D

Stem 12 1/4" – 30*

Stem 12 1/4" – 40**

Stem 13 3/4" – 40***

2040

1930

2200

2280

655

850

1010

1220

1510

1720

1930

4150

4250

5100

6750

1200

1300

1800

1000

1450

2050

2650

3200

3900

1900

2100

2600

1900

2100

2700

1500

1900

826

926

826

400

500

400

800

2200*

2650*

3250*

3850*

4400*

5100*

5350*

5550**

6400**

8550***

R a i s e b o r i n g h e a d s – user manual

Transport dimensions and weights

Segmented reaming heads

Note. Weights as noted in tables are only to be used as a guide.

Item Transport dimensions, mm

A B C D

Weight/piece Weight complete incl. incl. saddles saddles, segments & stem kg kg

CRH 6S reamer base

CRH 7S reamer base

CRH 8S reamer base

CRH 10SD reamer base

Segment to CRH 6S, 7S, 8S 430

Segment to CRH 10SD 770

Stem 12 1/4" – 30*

1631

1560

Stem 12 1/4" – 40

Stem 13 3/4" – 40***

1050

1325

400

500

400

500

1900

2700

1900

2100

2700

826

926

826

926

2300

2950

3950

4950

225

1000

1200

1300

1800

3950*

4600*

5600*

8750***

27

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R a i s e b o r i n g h e a d s – user manual

Transport dimensions and weights

Extendable reaming heads

Note. Weights as noted in tables are only to be used as a guide.

Item

Reamer base CRH 10E

Segment – 2109

Segment – 2110

Segment – 2111

Reamer base CRH 10ED

Segment – 2144

Segment – 2145

Segment – 2152

Segment – 2153

Reamer base CRH 10SE

Segment – 2134

Segment – 2135

Segment – 2136

Segment – 2138

Stem Ø 12 1/4" – 40

Stem Ø 13 3/4" – 40

Stem Ø 15" – 50

Reamer

Ø mm

Transport dimensions, mm

A B C D

3130 2140

3500 and 3824 610

3500 and 3824 720

3824

4042

610

2140

610

965

3687

785

610

1560

3047 815

3372 and 3696 950

3372 and 3696 610

3696 610

590

590 1015

1015

2100

2700

3100

2600

Weight / piece incl. saddles kg

1050

550

6725

700

1250

400

500

7700

375

825

500

7550

750

1625

1300

1800

2400

Reaming head type

CRH 10SE

CRH 10ED

CRH 10SE

Complete reamer incl. base, segments and Ø 13 3/4" stem weight / diameter, kg

Ø 3130 Ø 3500 Ø 3824 Ø 3687 Ø 4042 Ø 3047 Ø 3372 Ø 3696

9500 11750

11750

12750

12750 12550 14100

9925 11825 12825

R a i s e b o r i n g h e a d s – user manual

Transport dimensions and weights

CRH 12E

Note. Weights as noted in tables are only to be used as a guide.

Reaming head

CRH 12E

Ø 3534

Ø 3840

Ø 4100

Ø 4500

Ø 5000

Ø 5100

Ø 5520

Ø 5876

Stem Ø 13 3/4" – 50

Stem Ø 15" – 50

Transport dimensions, mm

2200

1600

1105

1530

3100

2700

3100

2470

2800

3000

3230

3550

3810

4090

910

1145

1155

1470

1700

1975

2170

645

925

1140

1190

1215

1783

990

Reaming Weight

head Reamer base Large segment Small segment Ø 15" Complete incl. base,

CRH 12E kg/pce incl. saddles kg/pce incl. saddles kg/pce incl. saddles Stem, kg segments and stem, kg

Ø 3534

Ø 3840

Ø 4100

Ø 4500

Ø 5000

Ø 5100

Ø 5520

Ø 5876

8200

3580

4775

5360

5655

6650

9200

10000

1250

1300

1550

1700

1925

2400

20260

22650

23920

25010

27300

32850

34450

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R a i s e b o r i n g h e a d s – user manual

Inspection

In order to keeep your reaming head in good working conditioning we recommend an inspection after each raise.

Check the following.

• Wear pad diameter on stem

• For cracks in the wrench ﬂats and in the thread of the stem

• Stem/reamer base bolt joints

• Saddle bolts

• Conditioning of the journal seats in the saddles

• Contact surface between saddle/reamer base

Check the following on the cutters.

• Button condition, use cutter gauge 7008-9445

• Seal/bearing. If the cutter is easy to rotate it needs

re-greasing, follow the instructions on page 33.

Serial number location on the different components see below.

Cutter serial number is found on the shaft end of the narrow part of the cutter and on the ball plug retainer.

The stem is marked at the bottom ﬂange and on the thread top.

Head serial number is found on one side of the head frame.

Cutter gauge 7008-9445 for measuring of button wear over the gauge button row of the cutters. The ﬁgures tell you the percentage of the protrosion left.

Removal of stem

R a i s e b o r i n g h e a d s – user manual

Remove the inner saddles from position 1 and 2.

Use the tool combination on page 8.

Dismount the seal retainer ring. Use the two releasing holes and tighten cross-wise until the retainer ring comes loose.

Dismount the twelve clamping bolts. Remove the protection bolts from the jacking holes in the stem ﬂange. Insert four of the loose bolts and tighten cross-wise until the stem is released.

Put a rod through the stem and attach the lifting equipment.

Pull the stem out.

Important!

When the stem and the saddles are reassembled, new bolts and nuts must be used.

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R a i s e b o r i n g h e a d s – user manual

Wear pad replacement

Replace the wear pads when the diameter D is less than shown in the table below.

Pilot hole diameter

1 7 7/8"

1 9"

1 9 7/8"

11"

12 1/4"

13 3/4"

15"

Ø D mm

192

220

242

271

303

341

373

Wear pads Wear pads thin type

Quantity Part No.

1 4

1 5

1 6

7008-9020

7008-9023

7008-9025-05

7008-9028-05

7008-9031-05

7008-9034-05

7008-9038-05

1 2

Remove the worn out wear pads by grinding away the welding joint. Pre-heat the area where the wear pads are to be welded to 370-450° C. Should the temperature drop to below 370°. Reheat before continuing.

Fix the wear pads in position with clamps. Important!

Make sure the ID of the wear pad corresponds with the OD of the stem.

32

Tack weld the pads to the stem.

Make the welding joints ± 10 mm longer than the wear pad and end with a smooth ﬁnish.

Fill the welding points properly using our recommended welding wire.After welding, the diameter over the wear pads must be checked. If some peeks exceed D-max, grind with a silicon carbide grinding wheel.

Recommended diameter over wear pads;

Pilot hole D-max, mm

1 7 7/8"

1 9"

1 9 7/8"

11"

12 1/4"

13 3/4"

15"

200

228

251

280

311

349

381

R a i s e b o r i n g h e a d s – user manual

Re-greasing of cutters

1 2

Remove the plastic protection cup and the snap ring.

Pull out the ball plug retainer.

Remove the conical plugs (7008-9257) from the seal retainers. Use proper allen key wrench (7008-9447).

Clean the centre hole carefully. Install the re-greasing plug and attach the grease gun.

Start pumping until grease comes out through one of the relief holes. Clean the thread and mount the plug. Put some

Loctite222 on the thread before tightening. Use the allen key wrench.

Rotate the cutter 20 revolutions. Continue to pump until grease comes out through the other relief hole. Mount a conical plug in this hole in the same way.

Re-install the ball plug retainer. Mount a new snap ring and a plastic protection cap together with new o-rings.

Spares for re-greasing/ cutter

Pcs Part No. Item

7008-9115

7008-9257

7008-9114

7008-9482

7008-9132-01

O-ring

Conical plug

Snap ring

Protection plug

Cutter grease 0,4 kg tube

33

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R a i s e b o r i n g h e a d s – user manual

Re-greasing option

If it is not possible to re-grease the cutter through the centre hole as described on page 33, we recommend to re-grease the cutter through the seal retainer.

1 2

Disconnect the two conical plugs in the seal retainers. Mount a grease nipple in one of the holes.

Attach a grease pump and start pumping.

Continue to pump until grease comes out through the relief hole in the opposite seal retainer. Rotate the cutters ±

20 revolutions. Mount two new conical plugs in each seal retainer.

Seal replacement

1 2

R a i s e b o r i n g h e a d s – user manual

Cut the four welding joints on the seal retainer. Use a small cutting disc. Remove protection ring 7008-9113.

Remove the snap ring 7008-9111. Use a hammer and a small chisel. Fill the cutter with grease before dismantling the seals to avoid dirt coming into the bearing system.

4 5

Make a puller tool by using two bolts, nuts and a small U-beam. Tack weld the two bolts to the retainer ring. Remove the retainer ring by tightening the nuts and tapping the retainer ring with a hammer. The retainer ring can be reused if it is not damaged.

Remove the two seal halves from both the retainer ring and the cutter shell.

Remove the O-ring 7008-9112 from the journal.

Clean the snap ring groove, the O-ring groove and the seal seat carefully. Ensure that the seal seat is in good condition. If not, ﬁle the marks and nicks. Make sure no muck or dirt comes in to the bearing system.

Inspect the retainer pin 7008-9118. Replace if showing excessive wear.

Install the two seal halves (7008-9110) in both the retainer ring and the cutter shell.

Important! Follow the mounting instructions from the seal manufacturer carefully.

Instructions can be obtained from your local

Sandvik representative.

Mount the O-ring 7008-9112. Mount the retainer ring carefully. E.g. use a hammer and clamp for smooth mounting. Mount the snap ring 7008-9111. Note! Always use a new O-ring and snap ring.

Mount the protection ring 7008-9113 and weld four joints 90° apart. Use MIG welding. Recommended welding wire Ø 1,2 mm

OK AUT-ROD 12,51 or similar.

Re-grease the cutter according to the regreasing instruction. This completes the seal change.

Spares to re-seal/ cutter

Pcs Part No.

7008-9110

7008-9101

7008-9111

7008-9115

7008-9113

Item

Seal

Seal retainer

Snap ring

O-ring

Lock ring

35

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R a i s e b o r i n g h e a d s – user manual

Inspection report

Raise No.:

Reaming head: CRH

Reaming head No:

Stem dia.:

Stem No.:

Date:

Dia.: mm

Stem check list

Wear pad dia.:

Wear pad OK:

Wrench ﬂats OK:

Thread OK:

Bolt joints OK:

Stem OK for use

in next raise:

Other:

Yes

Yes mm

Sign: mm

Saddle check list

Bolt joints OK:

OK for use

in next raise:

Others:

Yes

Cutter check list

Pos Cutter

Serial No.

1 9

1 5

1 6

1 7

1 8

1 1

1 2

1 3

1 4

Type

Re-grease Seal change Button Total

Yes No Yes No Life % Meters

Others

R a i s e b o r i n g h e a d s – user manual

37

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R a i s e b o r i n g h e a d s – user manual

HR-13121

Sandvik Mining and Construction Tools AB

SE-811 81 Sandviken, Sweden. Tel +46 26 26 20 00 Fax +46 26 26 23 00

Key features

Integral, segmented and extendable heads
Bolted components for flexibility
Different centre hole sizes for stems
Gauge saddle system for diameter reduction
Cutter positioning for different spacing
Wear pad replacement
Re-greasing of cutters
Seal replacement

Frequently asked questions

The manual describes four raise boring methods: raise boring, horizontal boring, blind boring, and down boring with a pre-drilled pilot hole. Each method has different applications and requirements, such as access points, diameter range, and drill pipe tension or compression.

The maximum recommended cutter load is 27 tonnes and the maximum recommended reaming head speed varies depending on the diameter. You should choose the net cutter load and speed based on the machine/drill pipe capacity and rock characteristics, using the fastest RPM the rock formation allows while maintaining the optimum cutter load for maximum rate of penetration.

The saddles are located in specific positions marked on the side of the head frame. They are secured using bolts, nuts, and Nord-lock washers. The tightening procedure requires a specific torque value and the use of new bolts and nuts, even during reassembly.

Different saddle types are used depending on positioning and the reaming head type. The most frequent dressings are shown in the illustration, and their part numbers are 7008-2XXX. The number of each type varies with the reaming head diameter and type.

Replace the wear pads when the diameter D is less than the maximum value specified in the table. The replacement involves grinding away the welding joint, preheating the area, fixing the pads with clamps, tack welding, filling welding points, and checking the diameter. If necessary, grind the peeks using a silicon carbide grinding wheel.