JP2004019181A - Lock bolt pressurizing/expanding seal head and simultaneously pressurizing/expanding method of a plurality of lock bolts - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lock bolt pressurizing/expanding seal head having a simple structure easily fittable to a sleeve, and holding the sleeve when fitted to the sleeve. <P>SOLUTION: The sleeve is held in a cylindrical housing 6 by the action of sleeve holding annular packing 8 fitted in an annular recessed part 7 arranged in a small diameter part 4 or stopper wall side annular seal packing 9 inserted into a large diameter part 5 and reducing an inner diameter a little smaller than an outer diameter of the sleeve. After sealing the stopper wall side annular seal packing 9 and sleeve inserting port side annular seal packing 10 by being brought into pressure contact with the sleeve by pressing in a pressurized fluid from a fluid inflow port 15, the pressurized fluid is pressed in the sleeve, that is, a lock bolt via a fluid flowing hole 16 arranged in an adapter ring 11, and the lock bolt is pressurized and expanded. Since this seal head does not fall off by a holding mechanism when installed on the lock bolt, the pressurized fluid can be simultaneously supplied from one pump to a plurality of seal heads installed on the lock bolt so that a plurality of lock bolts can be simultaneously pressurized and expanded. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
[Industrial applications]
The present invention is directed to a seal head for attaching to a steel pipe expansion type lock bolt inserted into a hole provided in a rock, press-fitting a fluid into the lock bolt to pressurize and expand, and a plurality of the seal heads. The present invention relates to a method for simultaneously pressing and expanding a plurality of lock bolts using the same.
[0002]
[Prior art]
In recent years, in order to solidify rocks and ground that are easily collapsed, tubular steel pipe expansion-type lock bolts have been used instead of conventional rod-shaped lock bolts.
It has a concave portion for expansion in the longitudinal direction, the front end is closed, and a lock bolt made of steel pipe with a rear end covered with a sleeve for pressurized fluid press-fit is inserted into the hole provided in the rock, and inserted into the side of the sleeve. A pressurized fluid is press-fitted through a pressurized fluid press-fitting hole, and the steel pipe is pressurized and expanded to adhere to the hole, thereby trying to solidify the rock or ground with the steel pipe.
Various devices have been used for expanding a steel pipe expansion type lock bolt.
[0003]
For example, in Japanese Patent Publication No. 2-5238, as shown in FIG. 1, a sleeve 102 closed at both ends and having a fluid inlet 101 at one end is covered, and communicates with the fluid inlet 101 to reach the inside. The end of a tubular steel pipe inflatable lock bolt 103 having a fluid inlet therethrough is inserted into a socket 105 of a holder 104 together with a sleeve 102, and the socket 105 is used to pressurize and expand the lock bolt. Proposed. In order to seal the sleeve 102 with respect to the socket 105, two pairs of sealing rings 107, 108, 109, 110 which are axially separated from each other with the supply ring 106 therebetween in the socket 105 are arranged. A hydraulically operated piston 111 is provided to press these sealing rings against the socket 105 and the sleeve 102. Then, while 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 port 101 provided in the sleeve 102. 103 is press-fitted.
[0004]
[Problems to be solved by the invention]
This device is an excellent device with respect to the fact that the sealing property between the sleeve 102 and the socket 105 can be improved when the lock bolt 103 is to be pressurized and expanded. However, since the sealing mechanism is complicated, the mode in which the piston 111 is reciprocally slid is employed, and a large number of annular sealing members 107 and the like are used, the sealing is performed using a pressurized fluid containing foreign matter. If this is attempted, the annular sealing members 112 and 113 inserted into the annular grooves of the sliding piston 111 and the annular sealing members 107 to 110 that are subjected to compression deformation between the piston and the housing main body have a disadvantage that they are easily deteriorated. In addition, when the sleeve 102 is inserted into the socket 105, the sleeve 102 cannot be fixed. For example, when the sleeve 102 is used to reinforce a crown portion in a tunnel, it is necessary to manually hold the sleeve. Not good. Further, since the insertion into the socket 105 and the pressurization / expansion operation are repeated for each lock bolt 103, the work efficiency is not good.
[0005]
The present invention has been devised to solve such a problem, and has a simple structure, is easily fitted to a sleeve, and is capable of holding a sleeve when fitted to the sleeve. It is an object of the present invention to provide a pressure / expansion seal head and a method for simultaneously pressing / expanding a plurality of lock bolts using the same.
[0006]
[Means for Solving the Problems]
In order to achieve the object, the seal head 1 for pressurizing and expanding the lock bolt according to the present invention has a sleeve insertion port 2 at the front end, 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 opening 2 at the tip; an annular packing 8 for holding a sleeve fitted in an annular recess 7 provided in the small diameter portion 4; The inserted stopper-wall-side annular seal packing 9, the sleeve-insertion-portion-side annular seal packing 10, and the adapter ring 11 disposed therebetween, the stopper-wall-side annular seal packing 9, which is inserted from the sleeve insertion opening 2, and the sleeve insertion opening. A guide ring 12 for restricting axial movement of the side annular seal packing 10 and the adapter ring 11 is provided. An annular recess 13 is formed in the center of the stopper in the axial direction, and a recess 14 for pressing the seal packing is formed in the center of the outer surfaces of the stopper wall side annular seal packing 9 and the sleeve insertion port side annular seal packing 10 in the axial direction. A fluid inlet 15 penetrates a portion of the cylindrical housing 6 corresponding to the adapter ring 11, and a fluid flow hole 16 penetrates the adapter ring 11.
[0007]
While the inserted sleeve is held by the sleeve holding annular packing 8 fitted in the annular concave portion 7 provided in the small diameter portion 4, the stopper wall side annular seal packing 9 and the sleeve insertion opening side annular seal packing 10 are used to form the sleeve. And pressurized fluid is pressed into the lock bolt to expand the lock bolt.
As an aspect of the sleeve holding, instead of the sleeve holding annular packing 8, the inner diameter of the stopper wall side annular seal packing 9 is made slightly smaller than the outer diameter of the inserted sleeve, and only the stopper wall side annular seal packing 9 is used. The sleeve may be held in action. At this time, as a mode for reducing the inner diameter of the stopper wall side annular seal packing 9, the inner diameter of the stopper wall side may be inclined and reduced so as to decrease, or the center in the axial direction may be reduced, that is, as a so-called mountain-shaped cross section. Is also good.
[0008]
A plurality of lock bolts are simultaneously pressurized and expanded by using the seal head for pressurizing and expanding the lock bolts. That is, the seal head 1 for pressurizing and expanding the lock bolt is fitted and held on a sleeve covered by 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 seal head 1 for lock bolt pressurization / expansion, are connected to a water supply port of a joint block 25, and pressurized fluid from a pump is supplied to the joint block. Press in.
[0009]
Embodiment
When expanding the steel pipe expansion type lock bolt, 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, and then pressurized fluid is supplied from a fluid inlet provided in the seal head. It is press-fitted.
The present inventors have conducted various studies in order to form a structure in which the seal head is attached to the lock bolt and does not fall from the sleeve by 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 in which the inner surface of the seal head and the sleeve are brought into close contact with each other by using water pressure. Further, they have found that the inner diameter of a part of the packing for bringing the seal head into close contact with the sleeve may be reduced so that the packing itself may have an action of holding the sleeve.
[0010]
The specific structure of the seal head will be described with reference to FIG. (See also Fig. 3 as appropriate)
The cylindrical housing 6 constituting the seal head 1 is provided with a sleeve insertion port 2 at a front end and a stopper wall 3 at a rear end. The inner surface is composed of a small diameter portion 4 close to the stopper wall 3 and a large diameter portion 5 connected to the sleeve insertion opening 2. An annular concave portion 7 is provided in the small diameter portion 4 near the rear end stopper wall 3 of the cylindrical housing 6, and an annular packing 8 for holding a sleeve 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 crown hole of the tunnel, the seal head 1 does not fall off by 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 annular seal packing 9 on the stopper wall side, the adapter ring 11, and the annular seal packing 10 on the sleeve insertion port side are screwed and positioned so as not to 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 surface of the stopper wall side annular seal packing 9 and the sleeve insertion port side annular seal packing 10, an annular recess 14 is formed to press the annular seal packing itself inward when pressurized fluid is received on its surfaces. An annular recess 13 for efficiently dispersing the pressurized fluid is formed in the inner peripheral surface of the adapter ring 11.
[0012]
In addition, one fluid inflow port 15 penetrates through the cylindrical housing 6 at the place where the adapter ring 11 is installed, and the adapter ring 11 has two or three fluid flow holes 16 communicating with the inner annular recess. The fluid inlet 15 is provided with a female screw portion 18 for mounting a base.
In the embodiment shown in FIG. 2, the fluid inlet 15 is formed so as to open to the outer peripheral surface of the cylindrical housing 6. However, as shown in FIG. 3, the fluid inlet 15 is parallel to the axis of the cylindrical housing 6 and has a stopper. It may be connected to an insertion hole 19 formed so as to extend in the wall direction, and a female screw portion 20 for mounting a base may be provided at an end thereof. In this case, the opening of the fluid inlet 15 on the outer peripheral surface of the cylindrical housing is closed by welding screws or other members. When this mode is adopted, there is also an advantage that when the pressurized fluid is press-fitted, it is easy to perform on-site work with a small installation space for fittings and the like.
[0013]
In the above embodiment, 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 ring-shaped packing without the sleeve-holding annular packing 8. It is possible. The mode 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 therein. That is, when the sleeve is inserted into the annular seal packing having a small outer diameter, both are fixed.
When the inner diameter of the annular seal packing is gradually reduced toward the back in the direction in which the sleeve is inserted, the sleeve is easily inserted and hardly removed. When the cross section of the packing is formed into a mountain shape, the packing can be inserted in either direction.
Needless to say, 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 may be adopted.
[0014]
As a material of the cylindrical housing 6, a general structural steel or a stainless steel is usually used, but it is also advantageous to use a high-tensile 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, the housing 6 has an inner diameter enough to receive 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 the lateral width of the holding packing, but a depth of 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 annular ring 8 for holding the sleeve also varies depending on the hardness and the lateral width of the packing for holding, it is sufficient that the inner diameter is 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 to increase the size to some extent in order to withstand the pressure applied during sealing and sufficiently exhibit the sealing effect.
In order to provide the stopper wall side annular seal packing 9 with the sleeve holding function, the minimum inner diameter thereof is sufficient to be 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 seal head 1 for pressurizing and expanding the lock bolt of the present invention will be described.
The seal head 1 for pressurizing and expanding the lock bolt of the present invention is fitted to the sleeve 22 of the lock bolt 21 in which a recess for expansion is formed, the front end is closed, and the sleeve 22 for pressurized fluid press-fit is covered on the rear end. Match. In FIG. 4, reference numeral 23 denotes a pressurized fluid press-fitting hole provided in the sleeve 22.
The sleeve 22 is held in the seal head 1 in such a manner that the sleeve is inserted so as to oppose the sleeve holding annular packing 8 and / or the stopper wall side annular seal packing 9. Therefore, for example, even when the seal head is fitted to the lock bolt inserted into the 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 of the sleeve 22 to / from the seal head 1 can be easily removed manually. Is preferred.
[0017]
A pressurized fluid injecting cap is screwed into a cap mounting female screw section 18 provided at an end of a fluid inlet 15 formed in the cylindrical housing 6 of the seal head 1 to start press-fitting the pressurized fluid.
The pressurized fluid that has been pressed is guided to the outer peripheral surface of the adapter ring 11 in the cylindrical housing 6. Since only two or three fluid communication holes 16 communicating with the inside are provided in the adapter ring 11, the pressurized fluid has two annular seal packings before reaching the fluid communication holes 16, that is, the stopper wall side annular seal packing. Acting on the pressing recess 14 provided on the outer peripheral surface of the annular seal packing 9 and the sleeve insertion port side, the two annular seal packings are moved inward, that is, pressed against the sleeve. The inner surface of the seal head 1 and the outer surface of the sleeve 22 are sealed by using an annular seal packing. Thereafter, the pressurized fluid passes through the fluid flow hole 16 formed in the adapter ring 11, passes through the annular recess 13 on the inner circumference of the adapter ring 11 and the through hole of the sleeve, that is, the pressurized fluid press-in hole 23, and enters the lock bolt. The press-fitting causes the lock bolt 21 to expand.
[0018]
In the above embodiment, one lock bolt is pressurized and expanded. However, a plurality of lock bolt pressurized and expanded seal heads are used to simultaneously pressurize and 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 and holding a sleeve 22 attached to the lock bolts 21 are pressurized attached to individual seal head housings. The pressurized fluid supply pipes are separately connected to the fluid inlet. A plurality of pressurized fluid supply pipes, each connected to a fluid inlet of a seal head for lock bolt pressurization / expansion, are connected to a water supply port of a joint block 25, and this joint block 25 is connected to a pump 24.
By the operation of the pump 24, a pressurized fluid is simultaneously pumped to a plurality of seal heads 1 for pressurization and expansion via the joint block 25, and the inner surface of each seal head and the outer surface of the sleeve are hermetically sealed in exactly the same manner as described above. Thereafter, the plurality of lock bolts are press-fitted and expanded at the same time by being pressed into the lock bolts.
By simultaneously expanding a plurality of lock bolts, for example, the work of reinforcing a partially soft portion of the rock can be efficiently performed in a very short time, and the stability of the tunnel is significantly improved.
[0019]
【The invention's effect】
As described above, by the development of the seal head for lock bolt pressurization / expansion of the present invention, by arranging the annular packing for holding the sleeve, or by providing the annular seal packing on the stopper wall side with the sleeve holding function, The seal head can be easily attached to and detached from the sleeve, so-called one-touch operation. In addition, since the seal head does not drop under its own weight due to the holding force of the holding packing, the seal head can be efficiently mounted by a small number of workers. Furthermore, if a plurality of seal heads are mounted on a plurality of sleeves, and 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 can be simultaneously applied. Since it can be compressed and expanded, the work of reinforcing the rock can be performed very efficiently.
[Brief description of the drawings]
FIG. 1 is a diagram illustrating a conventional seal head structure for lock bolt pressurization / expansion. FIG. 2 is a diagram illustrating a seal head structure for lock bolt pressurization / expansion of the present invention. FIG. FIG. 4 is a diagram illustrating a seal head structure for pressurizing and expanding a lock bolt. FIG. 4 is a diagram illustrating a mode of pressurizing and expanding a lock bolt using a seal head. FIG. 5 is a pressurizing and expanding a lock bolt of the present invention. For explaining a mode in which a plurality of lock bolts are simultaneously pressurized and expanded by using a sealing head for [Description of reference numerals]
1: Seal head 2: Sleeve insertion opening 3: Stopper wall 4: Small diameter section 5: Large diameter section 6: Cylindrical housing 7: Annular concave section 8: Annular packing for holding sleeve 9: Stopper wall side annular seal packing 10: Sleeve insertion Mouth side annular seal packing 11: Adapter ring 12: Guide ring 13: Annular dent 14: Seal packing pressing dent 15: Fluid inflow port 16: Fluid flow hole 17: Packing for guide ring seal 18: Female screw part for fitting base 19 : Insertion hole 20: female screw part for mounting a base 21: lock bolt 22: sleeve 23: pressurized fluid press-in hole 24: pump 25: joint block

Claims (7)

It has a sleeve insertion port (2) at the front end and a stopper wall (3) at the rear end, and is composed of a small diameter section (4) connected to the rear end stopper wall and a large diameter section (5) connected to the front end sleeve insertion port. 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). An annular seal packing (9), a sleeve insertion port side annular seal packing (10) and an adapter ring (11) arranged therebetween, and the stopper wall side annular seal packing (9) fitted through the sleeve insertion port (2). A guide ring (12) for restricting axial movement of the annular seal packing (10) on the sleeve insertion port side and the adapter ring (11), and a shaft on the inner surface of the adapter ring (11). An annular recess (13) is formed at the center in the opposite 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). Is formed, and a fluid inlet (15) is made to penetrate a portion corresponding to the adapter ring (11) of the cylindrical housing (6), and a fluid flow hole (16) is made to penetrate the adapter ring (11). A seal head for pressurizing and expanding a lock bolt, comprising: 2. A seal head for pressurizing and expanding a lock bolt according to claim 1, wherein the inner diameter of the stopper wall-side annular seal packing (9) is slightly smaller than the outer diameter of the sleeve into which the stopper is inserted. It has a sleeve insertion port (2) at the front end and a stopper wall (3) at the rear end, and is composed of a small diameter section (4) connected to the rear end stopper wall and a large diameter section (5) connected to the front end sleeve insertion port. A cylindrical housing (6), a stopper wall side annular seal packing (9) inserted into the large diameter portion (5), a sleeve insertion side annular seal packing (10), and an adapter ring (11) arranged therebetween. And a guide ring (9) fitted through the sleeve insertion opening (2) to restrict axial movement of the stopper wall side annular seal packing (9), the sleeve insertion opening side annular seal packing (10) and the adapter ring (11). 12), the inner diameter of the stopper wall side annular seal packing (9) is made slightly smaller than the outer diameter of the sleeve into which the stopper is inserted, and the adapter (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 recess (14) for packing pressing is formed, and a fluid inlet (15) is made to penetrate a portion corresponding to the adapter ring (11) of the cylindrical housing (6), and a fluid flow hole (16) is formed in the adapter ring (11). ). A seal head for pressurizing and expanding a lock bolt, characterized in that the seal head has a shape penetrating through. 4. The seal head according to claim 2, wherein an inner surface of the stopper wall-side annular seal packing (9) is formed so as to be inclined so as to become smaller as approaching the stopper wall (3). 4. The seal head for pressurizing and expanding a lock bolt according to claim 2, wherein the inner surface of the stopper-wall-side annular seal packing (9) is formed to have a mountain-shaped cross-section such that a central portion in the axial direction is reduced. The fluid inlet (15) provided in the cylindrical housing (6) is connected to the stopper wall side end through an insertion hole (19) formed parallel to the axis of the cylindrical housing (6) and extending in the direction of the stopper wall. The seal head for pressurizing and expanding a lock bolt according to any one of claims 1 to 5, wherein the seal head has an opening in a portion. A sleeve (22) in which the lock bolt press / expansion seal head (1) according to any one of claims 1 to 6 is covered by a lock bolt (21), and the seal head (1) is fluidized. A pressurized fluid supply pipe is connected to the inflow port (15), and a plurality of pressurized fluid supply pipes each connected to the fluid inflow port of the seal head for lock bolt pressurization and expansion are connected to the joint block (25). A method for simultaneously pressurizing and expanding a plurality of lock bolts, comprising connecting to a water supply port and pressurizing a pressurized fluid from a pump (24) into the joint block (25).

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