JP4035001B2 - Lock bolt pressurization / expansion seal head and multiple lockbolt simultaneous pressurization / expansion method - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a seal head that is attached to a steel pipe expansion type lock bolt inserted into a hole provided in a rock, and pressurizes / expands a fluid into the lock bolt, and a plurality of the seal heads. The present invention relates to a method for simultaneously pressurizing and expanding a plurality of lock bolts.
[0002]
[Prior art]
In recent years, tubular steel pipe expansion type lock bolts have come to be used in place of conventional bar-shaped lock bolts in order to consolidate rocks and ground that tend to collapse.
Insert a steel tube lock bolt with a recess for expansion in the longitudinal direction, closed at the tip and covered with a pressurized fluid press-fitting sleeve at the rear end into the hole in the rock, and place it on the side of the sleeve. A pressurizing fluid is press-fitted from the pressurized fluid press-fitting hole, and the steel pipe is pressurized and expanded to be brought into close contact with the hole so as to consolidate the rock and the ground with the steel pipe.
Various devices for expanding the steel pipe expansion type lock bolt are also used.
[0003]
For example, in Japanese Patent Publication No. 2-5238, as shown in FIG. 1, a sleeve 102 having a fluid inlet 101 closed at both ends and covered with one end is covered and communicated with the fluid inlet 101 to the inside. An end of a tubular steel pipe expansion lock bolt 103 having a fluid inlet therethrough is inserted into the socket 105 of the holder 104 together with the sleeve 102, and the lock bolt is pressurized and expanded using the socket 105. Proposed. In order to seal the sleeve 102 against the socket 105, two pairs of sealing rings 107, 108, 109, and 110 that are separated from each other in the axial direction with the supply ring 106 sandwiched in the socket 105 are arranged. Further, in order to press these sealing rings against the socket 105 and the sleeve 102, a piston 111 that operates with water pressure is provided. Then, in a state where the piston 111 is operated to press the sealing ring against the socket 105 and the sleeve 102, the pressurized fluid is supplied from the supply ring 106 in the socket 105 through the fluid inlet 101 provided in the sleeve 102 to the lock bolt. It is press-fitted into 103.
[0004]
[Problems to be solved by the invention]
This device is an excellent device in terms of being able to improve the sealing performance between the sleeve 102 and the socket 105 when trying to pressurize and expand the lock bolt 103. However, since the sealing mechanism is complicated and the piston 111 is reciprocally slid, and a large number of annular sealing members 107 are used, sealing is performed by using pressurized fluid mixed with foreign matter. If it tries, the annular sealing members 112 and 113 inserted in the annular groove part of the piston 111 which slides, and the annular sealing members 107-110 which receive compression deformation between piston-housing bodies have the fault that it deteriorates easily. Further, since the sleeve 102 cannot be fixed when the sleeve 102 is inserted into the socket 105, for example, when used for reinforcing the crown portion in the tunnel, it is necessary to hold the sleeve manually by the operator. Not good. Furthermore, since the insertion into the socket 105 and the pressurizing / expanding operation are repeated for each lock bolt 103, work efficiency is not good.
[0005]
The present invention has been devised to solve such problems. The lock bolt has a simple structure and is easy to fit into the sleeve, and can hold the sleeve when fitted into the sleeve. It is an object of the present invention to provide a pressure / expansion seal head and a simultaneous pressure / expansion method using a plurality of lock bolts.
[0006]
[Means for Solving the Problems]
In order to achieve the purpose, the lock bolt pressurizing / expanding seal head 1 of the present invention has a sleeve insertion port 2 at the front end and a stopper wall 3 at the rear end, and a small diameter portion 4 connected to the stopper wall 3 at the rear end. A cylindrical housing 6 having a large-diameter portion 5 connected to the sleeve insertion port 2 at the distal end, an annular packing 8 for holding a sleeve fitted in an annular recess 7 provided in the small-diameter portion 4, and the large-diameter portion 5. The inserted stopper wall side annular seal packing 9, the sleeve insertion port side annular seal packing 10 and the adapter ring 11 disposed therebetween, and the stopper wall side annular seal packing 9 inserted from the sleeve insertion port 2, the sleeve insertion port. A side ring seal packing 10 and a guide ring 12 for restricting movement of the adapter ring 11 in the axial direction are provided. An annular recess 13 is formed at the center in the axial direction, and a seal packing pressing recess 14 is formed at the axial center of the outer surface of the stopper wall side annular seal packing 9 and the sleeve insertion port side annular seal packing 10. The cylindrical housing 6 has a shape in which a fluid inflow port 15 is passed through a portion corresponding to the adapter ring 11 and a fluid circulation hole 16 is passed through the adapter ring 11.
[0007]
The sleeve is held by the stopper wall side annular seal packing 9 and the sleeve insertion port side annular seal packing 10 while the inserted sleeve is held by the sleeve holding annular packing 8 fitted in the annular recess 7 provided in the small diameter portion 4. And pressurizing a pressurized fluid into the lock bolt to expand the lock bolt.
As a mode of holding the sleeve, instead of the annular packing 8 for holding the sleeve, the inner diameter of the stopper wall side annular seal packing 9 is made slightly smaller than the outer diameter of the sleeve to be inserted, and only the stopper wall side annular seal packing 9 is used. The sleeve may be held by action. At this time, as an aspect of reducing the inner diameter of the stopper wall side annular seal packing 9, the inner wall of the inner stopper wall may be inclined and reduced so that the inner diameter of the stopper wall side becomes smaller. Also good.
[0008]
By using this lock bolt pressurizing / expanding seal head, a plurality of lock bolts are simultaneously pressurized and expanded. That is, the lock bolt pressurizing / expanding seal head 1 is fitted and held on a sleeve placed on the lock bolt, and a pressurized fluid supply pipe is connected to the fluid inlet 15 of the seal head. A plurality of pressurized fluid supply pipes each connected to the fluid inlet 15 of the lock bolt pressurizing / expanding seal head 1 are connected to the water supply port of the joint block 25, and pressurized fluid from the pump is supplied to the joint block. Press fit.
[0009]
Embodiment
When inflating a steel pipe expansion type lock bolt, after the seal head is fitted into a sleeve having a through-hole connected to the lock bolt and connected to the inside of the lock bolt, pressurized fluid is supplied from a fluid inlet provided in the seal head. Press fit.
The inventors of the present invention have made various studies in order to make the structure so that the seal head is attached to the lock bolt and does not fall from the sleeve due to the weight of the seal head itself when the seal head is fitted into the sleeve. As a result, it has been found that it is effective to dispose the holding packing in the seal head housing separately from the packing that uses the water pressure to closely contact the inner surface of the seal head and the sleeve. Further, the present inventors have found that the inner diameter of a part of the packing that closely contacts the seal head and the sleeve may be reduced so that the packing itself has an action of holding the sleeve.
[0010]
A specific structure of the seal head will be described with reference to FIG. (See also Figure 3 as appropriate)
A cylindrical housing 6 constituting the seal head 1 is provided with a sleeve insertion port 2 at the front end and a stopper wall 3 at the rear end. The inner surface includes a small diameter portion 4 close to the stopper wall 3 and a large diameter portion 5 connected to the sleeve insertion port 2. An annular recess 7 is provided in the small diameter portion 4 close to the rear end stopper wall 3 of the cylindrical housing 6 and a sleeve holding annular packing 8 is fitted therein. If the inner diameter of the annular packing 8 is made slightly smaller than the outer diameter of the sleeve 22, the sleeve 22 inserted inside is held by the packing. Therefore, for example, even when the seal head 1 is attached to the sleeve 22 of the lock bolt 21 inserted into the tunnel hole of the tunnel, the seal head 1 does not fall off due to its own weight.
[0011]
A stopper wall side annular seal packing 9, an adapter ring 11 and a sleeve insertion port side annular seal packing 10 are inserted into the large diameter portion 5 of the cylindrical housing 6 in order from the back, and a guide ring 12 is further inserted from the sleeve insertion port 2. The stopper wall side annular seal packing 9, the adapter ring 11, and the sleeve insertion port side annular seal packing 10 are positioned so that they cannot move in the axial direction. Reference numeral 17 denotes an annular guide ring seal packing for sealing between the guide ring 12 and the cylindrical housing 6.
On the outer peripheral surfaces of the stopper wall side annular seal packing 9 and the sleeve insertion port side annular seal packing 10 are formed annular recesses 14 for pressing the annular seal packing itself inward when pressurized fluid is received on the surfaces thereof. An annular recess 13 is formed on the inner peripheral surface of the adapter ring 11 to efficiently disperse the pressurized fluid.
[0012]
Further, one fluid inflow port 15 is made to pass through the installation place of the adapter ring 11 of the cylindrical housing 6, and two to three fluid circulation holes 16 communicating with the annular recess on the inner surface are made to pass through the adapter ring 11. The fluid inlet 15 is provided with a female thread portion 18 for attaching a base.
In the embodiment shown in FIG. 2, the fluid inlet 15 is bored so as to open to the outer peripheral surface of the cylindrical housing 6, but as seen in FIG. 3, the fluid inlet 15 is parallel to the axis of the cylindrical housing 6 and the stopper. It may be connected to an insertion hole 19 that is drilled so as to extend in the wall direction, and a female screw part 20 for attaching a base may be provided at the end thereof. At this time, the opening of the outer peripheral surface of the cylindrical housing of the fluid inlet 15 is closed by welding screws or other members. When this mode is adopted, there is an advantage that it is easy to perform on-site work in a small installation space such as a metal fitting when pressurizing a pressurized fluid.
[0013]
In the above aspect, the seal head 1 and the sleeve 22 are fixed by the sleeve holding annular packing 8, but they may be fixed by the sealing annular packing without the sleeve holding annular packing 8. Is possible. This aspect will be described.
The stopper wall side annular seal packing 9 can be held slightly smaller than the outer diameter of the sleeve without using the annular recess 7 and the sleeve holding annular packing 8 fitted thereto. That is, when the sleeve is inserted into the annular seal packing having a small outer diameter, both are fixed.
If the inner diameter of the annular seal packing is gradually decreased toward the back in the direction in which the sleeve is inserted, the sleeve is easy to insert and difficult to remove. Further, when the packing cross section is a mountain shape, the packing can be inserted in either direction.
Of course, it is possible to adopt a mode in which the inserted sleeve is held by the action of both the stopper wall side annular seal packing 9 and the sleeve holding annular packing 8.
[0014]
As the material of the cylindrical housing 6, general structural steel or stainless steel is usually used, but it is also advantageous to use a high-strength aluminum alloy in consideration of improvement in workability due to weight reduction.
Since a sleeve having an outer diameter of about 40 to 50 mm is used as the sleeve, the housing 6 has an inner diameter enough to accept the sleeve, and a length of about 60 to 70 mm is sufficient. The depth of the annular recess 7 into which the sleeve holding annular packing 8 is fitted depends on the hardness and width of the holding packing, but about several mm is sufficient. As the holding packing, it is preferable to use nitrile rubber having a Shore A hardness of about 70 to 90 degrees. Although the inner diameter of the sleeve holding annular packing 8 also varies depending on the hardness and width of the holding packing, it is sufficient to make it slightly smaller than the outer diameter of the sleeve. A width of about several mm is sufficient.
[0015]
The stopper wall side annular seal packing 9 and the sleeve insertion port side annular seal packing 10 are also preferably made of nitrile rubber or urethane rubber having the same hardness as the holding packing 8. In terms of size, it is preferable that the size is increased to some extent in order to withstand the pressure applied at the time of sealing and to fully exhibit the sealing effect.
In order to provide the stopper wall side annular seal packing 9 with a sleeve holding function, it is sufficient that the inner diameter of the minimum portion is slightly smaller than the outer diameter of the sleeve. The material of the adapter ring 11 is the same as that of the cylindrical housing 6.
[0016]
Next, a mode in which the lock bolt 21 is pressurized and expanded using the lock bolt pressurizing / expanding seal head 1 of the present invention will be described.
The lock bolt pressurizing / expanding seal head 1 of the present invention is fitted into the sleeve 22 of the lock bolt 21 in which the indentation for expansion is formed, the front end is closed, and the pressurizing fluid press-fitting sleeve 22 is covered at the rear end. Match. In FIG. 4, reference numeral 23 denotes a pressurized fluid press-fitting hole provided in the sleeve 22.
The sleeve is inserted into the sleeve holding annular packing 8 and / or the stopper wall side annular seal packing 9 so that the sleeve 22 is held in the seal head 1. Therefore, for example, even when the seal head is fitted to a lock bolt inserted in a hole formed in the crown portion of the tunnel, the seal head 1 does not fall from the sleeve 22 by its own weight. The size and material of the sleeve-holding annular packing 8 and / or the stopper wall-side annular seal packing 9 are adjusted and set so that the attachment / detachment force is within a range where the attachment / detachment of the sleeve 22 to / from the seal head 1 can be easily performed manually. It is preferable.
[0017]
A pressurizing fluid injection cap is screwed into a cap mounting female screw portion 18 provided at an end of the fluid inflow port 15 formed in the cylindrical housing 6 of the seal head 1, and press-fitting of the pressurizing fluid is started.
The pressurized fluid that has been press-fitted is guided to the outer peripheral surface of the adapter ring 11 in the cylindrical housing 6. Since the adapter ring 11 has only two or three fluid circulation holes 16 communicating with the inside thereof, two annular seal packings, that is, stopper wall side annular seal packings, before the pressurized fluid reaches the fluid circulation holes 16. 9 and the pressing recess 14 provided on the outer peripheral surface of the sleeve insertion port side annular seal packing 10, and the two annular seal packings are moved inward, that is, pressed against the sleeve. An annular seal packing is used to seal the inner surface of the seal head 1 and the outer surface of the sleeve 22. Thereafter, the pressurized fluid passes through the fluid circulation hole 16 formed in the adapter ring 11, passes through the annular recess 13 on the inner periphery of the adapter ring 11 and the through hole of the sleeve, that is, the pressurized fluid press-fitting hole 23, and enters the lock bolt. The lock bolt 21 is inflated by being press-fitted.
[0018]
In the above embodiment, one lock bolt is pressurized / expanded, but the present invention uses a plurality of lock bolt pressurizing / expanding seal heads to simultaneously pressurize / expand a plurality of lock bolts. Is also possible.
That is, as shown in FIG. 5, a plurality of lock bolt pressurizing / expanding seal heads 1 for fitting / holding sleeves 22 attached to the lock bolts 21 are attached to individual seal head housings. A pressurized fluid supply pipe is separately connected to the fluid injection cap. A plurality of pressurized fluid supply pipes each connected to the fluid inlet of the lock bolt pressurizing / expanding seal head are connected to the water supply port of the joint block 25, and the joint block 25 is connected to the pump 24.
By the operation of the pump 24, the pressurized fluid is simultaneously pumped to the plurality of pressurizing / expanding seal heads 1 through the joint block 25, and the inner surfaces of the respective seal heads and the outer surfaces of the sleeves are hermetically sealed by the same action as described above. Then, it press-fits into the lock bolt and pressurizes and expands the plurality of lock bolts simultaneously.
By simultaneously expanding the plurality of rock bolts, for example, the reinforcement work of the soft part of the rock can be performed efficiently in a very short time, and the stability of the tunnel is greatly improved.
[0019]
【The invention's effect】
As described above, by the development of the seal head for pressurizing and expanding the lock bolt of the present invention, by arranging the sleeve holding annular packing, or by giving the stopper wall side annular seal packing a sleeve holding function, The seal head can be easily attached to and detached from the sleeve with a so-called one-touch operation. In addition, since the sealing head does not drop by its own weight due to the holding force of the holding packing, the sealing head can be mounted efficiently by a small number of workers. Furthermore, after attaching a plurality of seal heads to a plurality of sleeves, if each pressurized fluid supply pipe connected to the fluid inlet of the seal head is connected to one joint block, a plurality of lock bolts are applied simultaneously. Because it can be pressurized and expanded, the work to reinforce the rock mass can be performed very efficiently.
[Brief description of the drawings]
FIG. 1 is a diagram for explaining a conventional lock bolt pressurizing / expanding seal head structure. FIG. 2 is a diagram for explaining a lock bolt pressurizing / expanding seal head structure according to the present invention. FIG. 4 is a diagram for explaining a seal head structure for pressurizing and expanding a lock bolt. FIG. 4 is a diagram for explaining a mode of pressurizing and expanding a lock bolt using the seal head. FIG. Explaining how to pressurize and expand multiple lock bolts simultaneously using a sealing head
1: Seal head 2: Sleeve insertion port 3: Stopper wall 4: Small diameter portion 5: Large diameter portion 6: Cylindrical housing 7: Annular recess 8: Annular packing for holding sleeve 9: Annular seal packing for stopper wall 10: Inserting a sleeve Port side annular seal packing 11: Adapter ring 12: Guide ring 13: Ring recess 14: Seal packing pressing recess 15: Fluid inlet 16: Fluid flow hole 17: Guide ring seal packing 18: Female thread portion 19 for attaching the cap : Insertion hole 20: Female thread part for attaching cap 21: Lock bolt 22: Sleeve 23: Pressurized fluid press-fitting hole 24: Pump 25: Joint block

Claims (7)

It has a sleeve insertion port (2) at the tip, a stopper wall (3) at the rear end, and consists of a small diameter portion (4) connected to the stopper wall at the rear end and a large diameter portion (5) connected to the sleeve insertion port at the tip. A cylindrical housing (6), an annular packing (8) for holding a sleeve fitted in an annular recess (7) provided in the small diameter portion (4), and a stopper wall side inserted in the large diameter portion (5) The annular seal packing (9), the sleeve insertion port side annular seal packing (10), the adapter ring (11) disposed therebetween, and the stopper wall side annular seal packing (9) inserted from the sleeve insertion port (2) A sleeve insertion port side annular seal packing (10) and a guide ring (12) for restricting axial movement of the adapter ring (11), and an inner shaft of the adapter ring (11) An annular recess (13) is formed at the center in the direction, and a seal packing pressing recess (14) at the axial center of the outer surface of the stopper wall side annular seal packing (9) and the sleeve insertion port side annular seal packing (10). In addition, a fluid inflow port (15) is passed through the cylindrical housing (6) corresponding to the adapter ring (11), and a fluid circulation hole (16) is passed through the adapter ring (11). A lock head for pressurizing and expanding a lock bolt, characterized by comprising: 2. The lock head for pressurizing and expanding a lock bolt according to claim 1, wherein an inner diameter of the stopper wall side annular seal packing (9) is slightly smaller than an outer diameter of a sleeve to be inserted. It has a sleeve insertion port (2) at the tip, a stopper wall (3) at the rear end, and consists of a small diameter portion (4) connected to the stopper wall at the rear end and a large diameter portion (5) connected to the sleeve insertion port at the tip. Cylindrical housing (6), stopper wall side annular seal packing (9) inserted into the large diameter part (5), sleeve insertion port side annular seal packing (10), and adapter ring (11) disposed therebetween And a guide ring that is inserted from the sleeve insertion port (2) and regulates axial movement of the stopper wall side annular seal packing (9), the sleeve insertion port side annular seal packing (10), and the adapter ring (11). 12), the stopper wall side annular seal packing (9) has an inner diameter slightly smaller than the outer diameter of the sleeve to be inserted, (11) An annular recess (13) is formed at the axial center of the inner surface, and a seal is formed at the axial center of the outer surface of the stopper wall side annular seal packing (9) and the sleeve insertion port side annular seal packing (10). A depression (14) for packing pressing is formed, and a fluid inflow port (15) is passed through a portion corresponding to the adapter ring (11) of the cylindrical housing (6), and a fluid circulation hole (16) is formed in the adapter ring (11). ), A seal head for pressurizing and expanding a lock bolt. The lock bolt pressurizing / expanding seal head according to claim 2 or 3, wherein an inner surface of the stopper wall side annular seal packing (9) is formed to be inclined so as to become smaller as it approaches the stopper wall (3). 4. The lock bolt pressurizing / expanding seal head according to claim 2 or 3, wherein the inner surface of the stopper wall side annular seal packing (9) is formed in a mountain-shaped cross section so that the central portion in the axial direction is small. The fluid inlet (15) provided in the cylindrical housing (6) is connected to the end of the stopper wall via an insertion hole (19) drilled so as to extend parallel to the axis of the cylindrical housing (6) and toward the stopper wall. The seal head for pressurizing / expanding a lock bolt according to any one of claims 1 to 5, wherein the seal head is opened in a portion. A sleeve (22) covered with the lock bolt pressurizing / expanding seal head (1) according to any one of claims 1 to 6 on a lock bolt (21) is fitted and held, and the fluid of the seal head (1) A pressurized fluid supply pipe is connected to the inlet (15), and a plurality of pressurized fluid supply pipes each connected to a fluid inlet of the lock bolt pressurizing / expanding seal head are connected to the joint block (25). A method for simultaneously pressurizing and expanding a plurality of lock bolts, wherein the pressurized fluid is press-fitted from a pump (24) into the joint block (25) by being connected to a water supply port.

Images