JPH074600U - Injection fixing type support member - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a liquid injection fixing type supporting member capable of reliably sealing an infusion liquid without burdening an operator. [Structure] Attach the porous elastic members 36 to 40 to the outer peripheral surface of the lock bolt 30 on the proximal side so as to gently shield between the bore hole and the lock bolt 30 by elastic restoring force at the time of driving. The injection liquid injected into the bore hole through the inside of the lock bolt 30 can be retained on the tip side of the porous elastic member 36. The pouring liquid permeates the porous elastic member 36 that receives a weak initial pressure from the pouring liquid, but the speed is slow,
The hardening progresses in the porous elastic member 36, and even if the injection liquid is full in the bore hole, even if a high pressure is applied and a part leaks to the porous elastic member 38 side, the pressure is weak and Leakage of the infused liquid to the outside is prevented by stagnation and curing between the porous elastic members 36 and 38, permeation into the porous elastic member 38, and curing, and finally by the porous elastic member 40. ..

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a liquid injection fixing type support member mainly composed of lock bolts used in tunnel construction, retaining wall construction, etc., and particularly, the fixing injection liquid is a gap between the main body of rock bolts etc. and rock or ground. The present invention relates to a liquid injection fixing type supporting member that does not leak from the liquid.

[0002]

[Prior art]

 In the NATO method (NATM method), which is common in tunnel construction in mountains, etc., after excavating the natural ground (if necessary, after cementing the wall with cement), a number of rock bolts are vertically inserted from the wall into the bedrock. A predetermined injection liquid (injection material) such as implantation, mortar, fixing agent, ground improvement material, etc. is used to fix and prevent collapse around the inner wall. For the lock bolt, a hole (bore hole) is made in the rock bed in advance with a rock drill, etc., and the lock bolt is driven into the hole afterwards, or the self-drilling rock bolt is rotated by the rock drill through the adapter. Bits attached to the ends of self-drilling rock bolts are used to excavate rock while excavating.

FIG. 15 shows an example of use of a rock bolt in the case where a borehole is previously drilled in rock and an injection liquid is injected using an injection pipe and an exhaust pipe. After drilling a borehole 16 of a predetermined depth from the inner wall 14 of the tunnel 12 excavated in the natural ground 10 to the inside of the rock perpendicularly to the inner wall 14, the lock bolt 18 is driven. An injection pipe 20, an exhaust pipe 22, and a packer 24 are attached to the lock bolt 18 in advance. As shown in FIG. 16, the packer 24 is formed by attaching a cloth member to a predetermined position on the mouth of the lock bolt 18 with a tape or the like so as to form a bag shape. A jet port 26 is formed in the pipe 20.

When the injection liquid (mortar, fixing agent, ground improving agent, etc.) is injected from the injection pipe 20 while exhausting the air in the borehole from the exhaust pipe 22, the injection liquid is injected from the injection port 26 of the injection pipe 20 to the packer. Enter the inside of 24 and enlarge the packer 24. As a result, the gap between the lock bolt 18 and the bore hole 16 is sealed near the mouth of the lock bolt 18. On the other hand, the injection liquid also comes out from the tip of the injection pipe 20 into the bore hole, and fills the gap between the bore hole 16 and the lock bolt 18. At this time, the air in the borehole 16 is exhausted into the tunnel 12 through the exhaust pipe 22. However, since the packer 24 swelled with the injection liquid acts as a seal, no defective filling portion of the injection liquid occurs in the borehole.

The work is completed when a certain amount of the injection liquid is injected or when the injection liquid leaks from the exhaust pipe 22, and the injection of the injection liquid is stopped. After that, when the injected liquid hardens, the lock bolt 18 and the periphery of the inner wall are integrally fixed, and supported by the hard internal rock in which the tip of the lock bolt is hammered in, whereby the collapse of the periphery of the inner wall is prevented.

FIG. 17 is an explanatory diagram showing another example of the packer. In the packer 28, a rubber member is attached to a predetermined position on the mouth of the lock bolt 18 with a tape or the like so as to form a bag. At this time, an injection pipe 30 opening inside the packer 28 is also attached. Then, from before the start of the injection of the injection liquid until the completion of the injection, air, water, etc. are fed into the packer 28 through the injection pipe 30 to expand the packer 28. As a result, it is possible to close the gap between the lock bolt 18 and the borehole 16 near the mouth of the lock bolt 18, and prevent defective filling of the injection liquid.

[0007]

[Problems to be solved by the device]

 By the way, in the conventional packers 24 and 28, after inserting the lock bolt 18 into the bore hole 16 and driving it, it is possible to infuse injecting liquid, air, water or the like into the bag and inflate it like a balloon. Therefore, it can be formed only by a relatively flexible film member such as cloth or rubber. On the other hand, it is difficult to make the borehole 16 drilled in the bedrock a clean hole wall, and often sharp rocks are exposed inside or broken rocks fall. Therefore, when the lock bolt 18 is inserted into the bore hole 16 and driven in, the packers 24 and 28 rub against sharp rocks or crushed rocks and partly breaks, and even if injection liquid, air, water, etc. are sent in. There were times when it couldn't be overwhelmed.

In such a case, the packers 24 and 28 do not exert a sealing effect, and the injection liquid sent through the injection pipe 20 into the gap of the borehole 16 leaks out from the mouth of the borehole 16 and locks with the borehole 16. Poor filling will occur in the gap between the bolts 18. At this time, it is necessary to pack the waste cloth from the mouth, which requires extra time, and if the waste cloth could not be prevented from leaking due to poor packing of the waste cloth, the lock bolt 16 and the surroundings of the inner wall could not be fixed properly. There was a problem that the desired support strength could not be secured.

On the other hand, since the self-drilling lock bolt is rotated, there is a high risk of damaging the packer, so the packer cannot be used, and after driving, waste or quick-setting cement is placed at the mouth of the borehole. Since it was packed, the work load was heavy, and there was a risk that the injection liquid would leak out due to poor packing due to variations in the work.

In view of the above, an object of the present invention is to provide a liquid injection fixing type supporting member capable of reliably sealing an injecting liquid without imposing a burden on an operator.

[0011]

[Means for Solving the Problems]

 SUMMARY OF THE INVENTION In the present invention, the above-mentioned problem is to wrap the outer peripheral surface with a gap in the axial direction near the body of the liquid injection fixing type support member such as a lock bolt, an anchor, and a grout tube, and near the hand of the liquid injection fixing type support member main body. This is achieved by providing a plurality of porous elastic members thus mounted.

[0012]

According to the present invention, when the liquid injection fixing type supporting member is driven into the ground, the porous elastic member is compressed, and the elastic restoring force makes the gap between the bore hole and the liquid fixing type supporting member main body loose. To be sealed. In this state, when the injection liquid is injected into the borehole by passing it through the body of the liquid injection fixing type support member or the injection pipe, the tip of the liquid injection fixing type support member is located at the most tip end between the main body and the hole. The first space on the tip side when viewed from the porous elastic member is filled with the injection liquid, and a part of the liquid permeates into the ground. Then, when receiving a weak initial pressure from the injecting liquid, the injecting liquid permeates into the porous elastic member closest to the tip, but the initial permeation rate is low because of resistance from the porous elastic member. After that, when the injection liquid becomes full and the pressure increases in the first space, the injection liquid enters the porous elastic member in a clogged state, and the hardening progresses to a certain degree. Since the injection liquid does not leak to the outside at a stretch, and when it is not completely cured in the porous elastic member, part of it is the most distal porosity and the second is the most distal porosity. It gradually leaks into the second space between the members and permeates the second porous porous member near the tip. The pressure in the second space is much weaker than that in the first space, and the rate of penetration into the porous elastic member that is the second closest to the tip is fairly slow, so that retention and hardening proceed in the second space, and Second, the hardening of the injecting liquid proceeds in the porous elastic member closer to the tip. When completely cured, a large pressure resistance is generated and the injected liquid in the second space does not leak outside, and along with this, the permeation of the injected liquid into the porous elastic member closest to the tip also stops. Since the porous elastic member also hardens and exhibits a large pressure resistance, it is possible to reliably fill the first space with the injecting liquid, and to retain and harden it, so that the desired supporting strength can be realized. In addition, since the second space was filled with the injection liquid and the pressure increased before the injection liquid was hardened in the second porous elastic member near the tip, the porous elasticity near the second end was increased. Even if it leaks into the space nearer to the member, the amount is no longer small. If there is a third porous elastic member, the leakage of the infused liquid to the outside will be the same as for the second porous elastic member. Is blocked.

In this way, the pouring liquid can be reliably shielded by the plurality of porous elastic members mounted near the body of the pouring fixing type supporting member body, so that the pouring liquid leaks to the outside during the pouring operation. As a result, there is no possibility of inadequate filling of the injection liquid in the gap between the body of the liquid injection fixing type support member and the borehole. In addition, unlike the case where the body of the liquid injection fixing type supporting member is self-drilling type, there is no need to pack waste cloth or quick-setting cement, and the work load on site is greatly reduced.

In addition, in a liquid injection fixing type supporting member having a liquid injection fixing type supporting member main body such as a lock bolt, an anchor, a grout tube, etc., which is hollow and has one or a plurality of jet ports at its tip or the like, Provided near the body of the liquid-fixing type supporting member main body are a plurality of porous elastic members mounted so as to wrap around the outer peripheral surface while leaving a gap in the axial direction, and to the liquid-fixing type supporting member main body between the porous elastic members. Drill a spout. As a result, when the injection fixing type support member main body is driven into the ground and then the injection liquid is injected, first, the injection liquid enters the space between the porous elastic members from the jet outlet near the hand, and the porous elastic member is injected. It also penetrates into the members. If the ejection port is not so large, the pressure applied to the porous elastic member is weak and the permeation speed is slow, so hardening proceeds. After that, the injection liquid enters the bore hole from the ejection port such as the tip of the body of the liquid injection fixing type supporting member, and the space on the tip side of the porous elastic member closest to the tip of the body of the liquid fixing fixing type supporting member is filled with the injection liquid. Will be done. When the space is filled with the injection liquid, a high pressure is applied to the porous elastic member closest to the tip, but since the range over the plurality of porous elastic members has already hardened, a sufficient shielding effect is exerted, The injected liquid does not leak outside. Therefore, the inside of the borehole is hardened when it is filled with the injection liquid, and the desired supporting strength is achieved.As a conventional packer used, the packer is broken, so that leakage is prevented and waste cloth or quick-setting cement is filled. There is no need to do it, and on-site work can be performed easily.

In addition, in a liquid injection fixing type supporting member having a liquid injection fixing type supporting member main body such as a lock bolt, an anchor, a grout tube, etc., which is hollow and has one or a plurality of jet ports at its tip or the like, Provide one or more porous elastic members mounted so as to wrap around the outer peripheral surface near the body of the liquid fixing type supporting member main body, and at the place where the multi-hole elastic member of the liquid fixing type supporting member main body is mounted. Drill a spout. As a result, when the injection fixing type support member main body is driven into the ground and then the injection liquid is injected, first, the injection liquid permeates into each porous elastic member from the ejection port near the hand. If the ejection port is not so large, the pressure applied to the porous elastic member will be weak and the permeation rate will be slow, so hardening will proceed. After that, the injection liquid enters the borehole from the ejection port such as the tip of the main body of the injection fixing type support member, and the space between the support member and the porous elastic member is filled with the injection liquid. When the space is filled with the injection liquid, a high pressure is applied to the porous elastic member, but the porosity elastic member has already hardened to some extent, and the injection liquid permeates the porous elastic member first. Since the pressure of the jet outlet is also increased and the porous elastic member is pressed against the hole wall side, a sufficient shielding effect is exhibited, and the injected liquid does not leak outside. Therefore, the inside of the borehole is hardened in a state where it is filled with the injecting liquid, and the desired supporting strength is achieved. There is no need to do it, and on-site work can be performed easily.

In addition, in a liquid injection fixing type supporting member having a liquid injection fixing type supporting member main body such as a lock bolt, an anchor and a grout pipe, and one or a plurality of injection pipes attached to an outer surface of the liquid injection fixing type supporting member main body. In the vicinity of the body of the liquid injection fixing type supporting member, a plurality of porous elastic members mounted so as to wrap around the outer peripheral surface while providing a gap in the axial direction are provided, and at least one injection pipe is provided between the porous elastic members. There should be a spout that is open at. As a result, when the body of the liquid injection fixing type supporting member is driven into the ground and then the liquid is injected through the injection pipe, first, the liquid enters the space between the porous elastic members from the ejection port near the hand. , Penetrates into the porous elastic member. If the ejection port is not so large, the pressure applied to the porous elastic member will be weak and the permeation speed will be slow, so hardening will proceed. After that, the injection liquid enters the borehole from the other ejection port of the injection pipe, and the space on the tip side of the porous elastic member closest to the tip of the injection fixing type supporting member body is filled with the injection liquid. When the space is filled with the injection liquid, a high pressure is applied to the porous elastic member closest to the tip, but since the range over multiple porous elastic members has already been hardened, a sufficient shielding effect is exerted and injection is performed. The liquid does not leak outside. As a result, the inside of the borehole is hardened with the injection liquid filled, and the desired support strength is achieved.Therefore, as in the conventional case, the used packer broke, so leakage was prevented and waste cloth and quick-setting cement were used. You don't have to pack it, and you can easily perform on-site work.

Further, in a liquid injection fixing type supporting member having a liquid injection fixing type supporting member main body such as a lock bolt, an anchor, a grout pipe, etc., and one or a plurality of injection pipes attached to an outer surface of the liquid injection fixing type supporting member main body. , One or more porous elastic members mounted so as to wrap around the outer peripheral surface were provided near the body of the liquid injection fixing type supporting member main body, and at least one injection pipe was mounted with the porous elastic member. There should be a jet outlet that opens at the location. As a result, when the body of the liquid injection fixing type supporting member is driven into the ground and then the liquid is injected through the injection pipe, first the liquid permeates into each porous elastic member from the jet outlet near the hand. . If the ejection port is not so large, the pressure received by the porous elastic member is weak and the permeation rate is slow, so hardening proceeds. After that, the injection liquid enters the borehole from the other ejection port of the injection pipe, and the space between the injection hole and the porous elastic member is filled with the injection liquid. When the space is filled with the injection liquid, a high pressure is applied to the porous elastic member, but the hardening of the porous elastic member has already progressed to some extent, and the injection liquid permeates into the porous elastic member first. Since the pressure of the ejected port is also increased and the porous elastic member is pressed against the hole wall side, a sufficient shielding effect is exhibited and the injected liquid does not leak outside. Therefore, the inside of the borehole is hardened with the injection liquid filled, and the desired supporting strength is achieved, so that the used packer broke and the leak was prevented and the waste cloth and quick-setting cement were packed. There is no need to worry, and on-site work can be done easily.

[0018]

【Example】

 FIG. 1 is an external perspective view of a liquid injection fixing type supporting member according to a first embodiment of the present invention. Fig. 1 is a type that is inserted into a bore hole that has been drilled in advance in a rock bed, and uses a lock bolt that does not require an injection pipe as the main body of the liquid injection fixing type support member. In FIG. 1, reference numeral 30 denotes a hollow lock bolt as an example of a main body of a liquid injection fixing type supporting member, through which injection liquid is press-fitted into the bore hole from the jet side 32, 34 provided through the inside through the tip and near the tip. It is like this. Numerals 36 to 40 are three porous bodies of a predetermined length and a predetermined thickness, which are adhered to the proximal side of the lock bolt 30 (corresponding to the mouth side of the borehole) so as to wrap the outer peripheral surface while being separated by a predetermined interval in the axial direction. It is an elastic member. These porous elastic members 36 to 40 may be, for example, ordinary sponge materials (open cells), but may also be members having water-swelling expansibility. The thickness of the porous elastic members 36 to 40 is such that the outer diameter of the porous elastic members 36 to 40 when bonded to the lock bolt 30 is slightly larger than the hole diameter of the bore hole.

As shown in FIG. 2, the porous elastic members 36 to 40 are attached to the lock bolt 30 by previously inserting a cylindrical shape into the lock bolt 30 or by inserting a square shape into the lock bolt 30. It should be wrapped around 30. The lock bolt 30 and the porous elastic members 36 to 40 constitute a liquid injection fixing type supporting member 42.

FIG. 3 and FIG. 4 are explanatory views of the usage state of this embodiment. A borehole 16 having a predetermined depth is bored from the inner wall 14 of the tunnel 12 excavated in the natural ground 10 to the inside of the rock perpendicularly to the inner wall 14 (see FIG. 3 (1)). Next, the liquid injection fixing type supporting member 42 in which the lock bolt 30 and the porous elastic members 36 to 40 are integrated is inserted into the bore hole 16 and driven therein (see FIG. 3 (2)). At this time, since the porous elastic members 36 to 40 are easily compressed by the external force received from the hole wall, they do not hinder the insertion and the driving. When the injection fixing support member 42 is inserted and hammered in, the elastic restoring force causes the gap between the bore hole 16 and the lock bolt 30 to be shielded relatively gently by the porous elastic members 36-40. When inserting or driving the liquid injection fixing type supporting member 42, it is considered that any one of the porous elastic members 36 to 40 is partially damaged by the hole wall or is dented against rocks protruding from the hole wall after the driving is completed. However, since the other porous elastic member is in close contact with the hole wall, the shielding property is secured.

After that, an injection liquid (a mortar, a fixing agent, a ground improvement material, etc., which has a relatively short gel time (curing time: about 30 to 70 seconds) here) is supplied from the near side of the lock bolt 30. When injected, it first comes out from the ejection ports 32, 34 such as the tip into the bore hole, and between the bore hole 16 and the lock bolt 30, into the first space A closer to the tip than the porous elastic member 36 closest to the tip. If it is filled and the geology of the natural ground 10 is permeable, part of it will penetrate into the ground (see Fig. 3 (3)).

While the first space A is not yet filled with the injection liquid, a relatively weak initial pressure is applied to the porous elastic member 36 closest to the tip, which is relatively weaker than that of the injection liquid in the first space A. The shield action of the porous elastic member 36 is superior, most of the injected liquid is retained in the first space A, and only a part thereof penetrates into the porous elastic member 36. However, since the resistance is received from the porous elastic member 36, the initial permeation rate is slow and the filling of the injection liquid into the first space A proceeds (see FIG. 4 (1)).

After that, when the injection liquid is filled in the first space A and the pressure is increased, the injection liquid is clogged in the porous elastic member 36, and the curing is advanced to some extent. Therefore, the pressure resistance of the porous elastic member 36 is high, the injected liquid does not leak to the outside at once, and if the inside of the porous elastic member 36 is not completely cured, some Is gradually leaked into the second space B between the porous elastic members 36 and 38 closest to the tip and the second tip, and permeates into the second porous elastic member 38 ( See FIG. 4 (2).

Since the pressure of the injecting liquid in the second space B is much weaker than that in the first space A, and the permeation rate into the porous elastic member 38 is considerably slow, the porous elastic member 38 has a low pressure. The curing of the injecting liquid proceeds in the middle and the second space B. When completely cured, a large pressure resistance is generated and the injected liquid in the second space does not leak to the outside. Along with this, permeation of the injected liquid into the porous elastic member 36 is stopped and the porous elastic Since the member 36 also hardens and exhibits a large pressure resistance, it is possible to reliably fill the first space A with the injection liquid and retain and harden it.

It should be noted that the second space B was filled with the injecting liquid and the pressure was increased before the injecting liquid was hardened in the second porous elastic member 38 near the tip, so that the porous elastic member 38 was formed. Therefore, even if it leaks into the third space C on the near side, the amount is no longer small, and the third liquid penetrates into the porous elastic member 40 and is hardened to prevent the infused liquid from leaking to the outside (Fig. 4). (See (3)).

When a predetermined amount of the injection liquid is injected, the work is completed, and the injection of the injection liquid is stopped. After that, when the entire injected liquid in the borehole 16 hardens, the lock bolt 30 and the periphery of the inner wall of the tunnel are integrally fixed, and the rock bolt 30 is supported by the hard internal rock mass at the tip of the rock bolt, causing the inner wall to collapse. Is prevented.

According to the first embodiment, since the pouring liquid can be reliably shielded by the plurality of porous elastic members 36, 38, 40 mounted near the lock bolt 30, the pouring liquid can be securely The injected liquid does not leak to the outside and the gap between the lock bolt 30 and the bore hole 16 does not cause defective filling of the injected liquid. Therefore, as in the conventional case, the packer is inflated by some method or the packer is broken. In this case, there is no need to prevent leaks and the work load on site is greatly reduced.

The porous elastic members 36 to 40 may be attached to the lock bolt 30 by adhesion, or may be attached by winding tape at both ends. Further, only two porous elastic members may be provided, or four or more may be provided. Further, in the case of the type in which the lock bolt is solid and the injection liquid is injected into the borehole using the injection pipe, as shown in FIG. 5, the injection pipe 44 and the necessary exhaust pipe 46 are attached to the lock bolt 30A by tape or the like. The liquid injection fixing type supporting member 42A may be configured by mounting the plurality of porous elastic members 36 to 40 on top of the mounting. It should be noted that the gap generated between the lock bolt 30A and the porous elastic members 36 to 40 at the injection pipe 44 and the necessary exhaust pipe 46 may be filled with a filler 48 as shown in FIG.

Further, in the case of a self-drilling type rock bolt in which the bore hole is drilled with the bit at the tip while rotating itself, as shown in FIG. 7 (1), a multi-hole type bolt mounted near the self-drilling lock bolt 30B. The porous elastic members 36 to 40 are slightly compressed with respect to the elastic members 36 to 40, and a collar 50 made of a rigid thin-walled steel pipe or a plastic pipe is detachably fitted to the liquid elastic fixing member 36 to 40. The formula support member 42B should be configured. The collar 50 has a diameter slightly smaller than the diameter of the borehole so as not to hinder the drilling work. The collar 50 covering the porous elastic members 36 to 40 can be easily removed by pulling it out by applying an external force.

Then, the self-drilling lock bolt 30B equipped with the porous elastic members 36 to 40 and the collar 50 is rotated by the rock drill 54 via the adapter 52, and the bit is fitted to the tip of the self-drilling lock bolt 30B. While excavating the bedrock at 56, it is driven to a predetermined depth (see Fig. 7 (1)). At this time, since the porous elastic members 36 to 40 are protected by the collar 50 having a smaller outer diameter than the bore hole 16 drilled by the bit 56 and having strength, it does not hinder the driving operation, and The porous elastic members 36-40 are not damaged. Further, since the collar 50 is pushed by the adapter 52, even if the self-drilling lock bolt 30B is driven into the rock, the collar 50 will not come off from the porous elastic members 36-40.

When the driving of the self-drilling lock bolt 30B is completed, the adapter 52 and the color 50 are removed (see FIGS. 7 (2) and 7 (3)). Then, the porous elastic members 36 to 40 are elastically restored, and the gap between the bore hole 16 and the self-drilling lock bolt 30B near the mouth of the bore hole 16 can be loosely sealed. Since the porous elastic members 36 to 40 are covered with the collar 50 when the self-drilling rock bolt 30B is driven, the porous elastic members 36 to 40 are not damaged and the gap can be closed with certainty.

After that, if the injection liquid is press-fitted through the hollow inside of the self-drilling lock bolt 30B (see FIG. 7 (4)), the injection liquid is surely injected into the borehole in the same manner as in the first embodiment described above. The desired supporting strength can be realized by filling the inside of 16, filling and stagnating. When the self-drilling lock bolt is used as the liquid injection fixing type supporting member main body, the collar does not necessarily have to be used.

FIG. 8 is an explanatory view of a use state of the second embodiment according to the present invention, in which the same components as those in FIG. 1 are designated by the same reference numerals. In the liquid injection fixing type supporting member 42C of FIG. 8, the jet port 58 is provided in the lock bolt 30, between the porous elastic members 36 and 38, and between the porous elastic members 38 and 40. 60 is drilled.

Next, a usage state of the liquid injection fixing type supporting member 42C in the second embodiment will be described. When the injection fixing support member 42C is inserted and driven in, the gap between the borehole 16 and the lock bolt 30 is relatively gently shielded by the porous elastic members 36 to 40 due to the elastic restoring force (see FIG. 8). (See (1)). After that, when the injection liquid is injected from the proximal side of the lock bolt 30 from 32, first, the third space C between the porous elastic members 36 and 38 and the space between the porous elastic members 38 and 40 from the ejection ports 58 and 60. The injecting liquid enters the second space B and penetrates into the porous elastic members 36 to 40. If the ejection ports 58 and 60 are not so large, the pressure applied to each of the porous elastic members 36 to 40 is weak and the permeation rate is slow, so that the curing proceeds (see FIG. 8 (2)).

After that, the injection liquid enters the borehole 16 through the ejection ports 32, 34 such as the tip of the lock bolt 30, and the tip end side of the porous elastic member 36 located closest to the tip between the bore hole 16 and the lock bolt 30. The first space A is filled with the injection liquid (see FIG. 8 (3)). When the first space A is filled with the injection liquid, a high pressure is applied to the porous elastic member 36, but since the range extending over the plurality of porous elastic members 36 to 40 has already been hardened, a sufficient shielding effect is exerted. As a result, the injected liquid does not leak outside, and the first space A can be reliably filled with the injected liquid and retained and cured.

The work is completed when a predetermined amount of the injection liquid is injected, and the injection of the injection liquid is stopped. After that, when the entire injected liquid in the borehole 16 hardens, the lock bolt 30 and the periphery of the inner wall of the tunnel are integrally fixed, and the rock bolt 30 is supported by the hard internal rock mass at the tip of the rock bolt, causing the inner wall to collapse. Is prevented.

Also according to the second embodiment, the injection liquid can be surely shielded by the plurality of multi-hole elastic members 36, 38, 40 mounted near the lock bolt 30, so that the injection work can be performed. In addition, the injected liquid does not leak to the outside and the gap between the lock bolt 30 and the borehole 16 does not cause defective filling of the injected liquid. Therefore, as in the conventional case, the packer is inflated by some method or the packer is not used. There is no need to prevent leaks when the torn parts are broken, which greatly reduces the work load on site. It should be noted that each of the second and third spaces B and C may be provided with one or more ejection ports provided between the porous elastic members.

When the injection liquid is injected using the injection pipe, as shown in FIG. 9, in the injection pipe 44, between the porous elastic members 36 and 38 and between the porous elastic members 38 and 40. The injection ports 62 and 64 may be provided at positions corresponding to the space between the porous elastic members 36 and 38, and the inside of the injection pipe 440 provided separately from the injection pipe 44 as shown in FIG. If the ejection ports 62 and 64 are provided at the corresponding positions between the elastic materials 38 and 40, the time from the first space (see A in FIG. 8) can be increased similarly to the second embodiment in FIG. First, the range of the porous elastic members 36 to 40 is hardened first, so that the filling liquid filled in the first space can be reliably retained and hardened.

FIG. 11 is an explanatory view of a usage state of the third embodiment according to the present invention, in which the same components as those in FIG. 1 are designated by the same reference numerals. In the liquid injection fixing type supporting member 42D shown in FIG. 11, jet ports 66, 68, 70 are formed in the lock bolt 30 at positions corresponding to the porous elastic members 36, 38, 40.

The usage state of the liquid injection fixing type supporting member 42D will be described with reference to FIG. When the injection fixing support member 42D is inserted and driven in, the gap between the borehole 16 and the lock bolt 30 is relatively gently shielded by the porous elastic members 36 to 40 due to the elastic restoring force (FIG. 11). (See (1)). After that, when the injection liquid is injected from the proximal side of the lock bolt 30, first, the injection liquid permeates into the porous elastic members 36 to 40 from the ejection ports 66 to 70 near the proximal side. If the ejection ports 66 to 70 are not so large, the pressure applied to the porous elastic members 36 to 40 is weak and the permeation speed is slow, so that the curing proceeds (see FIG. 11 (2)).

After that, the injection liquid enters the borehole 16 from the ejection ports 32, 34 such as the tip of the lock bolt 30, and the first space A between the porous elastic member 36 and the tip closest to the tip is filled with the injection liquid. (See FIG. 11 (3)). When the first space A is filled with the injection liquid, a high pressure is applied to the porous elastic members 36, but the hardening of each of the porous elastic members 36 to 40 has already progressed to some extent, and The pressure of the ejection ports 66 to 70 infiltrated with the injection liquid in the elastic members 36 to 40 is also increased, and the porous elastic members 36 to 40 are pressed against the hole wall side, so that a sufficient shielding effect is exerted and the injection liquid is injected. Does not leak outside. Therefore, the inside of the borehole 16 is retained and hardened in a state of being filled with the injection liquid.

When a predetermined amount of the injection liquid is injected, the work is completed, and the injection of the injection liquid is stopped. After that, when the entire injected liquid in the borehole 16 hardens, the lock bolt 30 and the periphery of the inner wall of the tunnel are integrally fixed, and the rock bolt 30 is supported by the hard internal rock mass at the tip of the rock bolt, causing the inner wall to collapse. Is prevented.

Also according to the third embodiment, the injecting liquid can be reliably shielded by the plurality of multi-hole elastic members 36, 38, 40 mounted near the lock bolt 30. In addition, the injected liquid does not leak to the outside and the gap between the lock bolt 30 and the borehole 16 does not cause defective filling of the injected liquid. Therefore, as in the conventional case, the packer is inflated by some method or the packer is not used. There is no need to prevent leaks when the torn parts are broken, which greatly reduces the work load on site. The number of ejection ports provided at the position of the porous elastic member may be one or plural per one porous elastic member.

When the injection liquid is injected using the injection pipe, as shown in FIG. 12, the injection ports 72 to 76 are provided in the injection pipe 44 at positions corresponding to the porous elastic members 36 to 40. 13 or, as shown in FIG. 13, if the injection pipes 440 provided separately from the injection pipe 44 are provided with the ejection ports 72 to 76 at positions corresponding to the porous elastic members 36 to 40. Similarly to the third embodiment of FIG. 11, the range of the porous elastic members 36 to 40 is hardened before the first space (see A of FIG. 11), and the first space is filled. The injected liquid can be reliably retained and cured.

Further, the second embodiment and the third embodiment are combined to correspond to the space between the porous elastic members 36 to 40 of the lock bolt (see FIG. 14) or the injection hype (not shown). The ejection ports 58, 60, 66 to 70 may be provided at locations corresponding to both the location and the locations of the respective porous elastic members 36, 38, 40. Further, in each of the above-described embodiments and modifications, three porous elastic members are provided, but in the first and second embodiments and their modifications, two or four or more may be provided. In the third embodiment and its modification, the number may be one, two, or four or more.

Further, in each of the embodiments and the modifications, the lock bolt used in the tunnel construction by the NATOM method etc. is taken as an example, but it is used in the anchor used in the retaining wall construction etc., the ground improvement construction and the ground reinforcement construction etc. The same can be applied to other types of liquid injection fixing type supporting member bodies such as grout tubes used.

[0047]

[Effect of device]

 As described above, according to the present invention, a plurality of porous elastic members mounted so as to wrap around the outer peripheral surface are provided in the vicinity of the body of the liquid injection fixing type support member main body at intervals in the axial direction. When the member is driven into the ground, the porous elastic member is compressed, and the elastic restoring force gently seals the gap between the bore hole and the body of the liquid injection fixing type supporting member. In this state, if the injection liquid is injected into the bore hole by passing through the body of the liquid injection fixing type supporting member or the injection pipe, the tip of the injection fixing type supporting member main body and the bore hole are located at the most distal end. The first space on the tip side when viewed from the porous elastic member is filled with the injection liquid, and part of the liquid permeates into the ground. Then, when receiving a weak initial pressure from the injecting liquid, the injecting liquid permeates into the porous elastic member closest to the tip, but the initial permeation rate is low because of resistance from the porous elastic member. After that, when the injection liquid becomes full and the pressure increases in the first space, the injection liquid enters the porous elastic member in a clogged state, and the hardening progresses to a certain degree. Since the injection liquid does not leak to the outside at a stretch, and when it is not completely cured in the porous elastic member, part of it is the most distal porosity and the second is the most distal porosity. It gradually leaks into the second space between the members and permeates the second porous porous member near the tip. The pressure in the second space is much weaker than that in the first space, and the rate of penetration into the porous elastic member that is the second closest to the tip is fairly slow, so that retention and hardening proceed in the second space, and Second, the hardening of the injecting liquid proceeds in the porous elastic member closer to the tip. When completely cured, a large pressure resistance is generated and the injected liquid in the second space does not leak outside, and along with this, the permeation of the injected liquid into the porous elastic member closest to the tip also stops. Since the porous elastic member also hardens and exhibits a large pressure resistance, it is possible to reliably fill the first space with the injecting liquid, and to retain and harden it, so that the desired supporting strength can be realized. In addition, since the second space was filled with the injection liquid and the pressure increased before the injection liquid was hardened in the second porous elastic member near the tip, the porous elasticity near the second end was increased. Even if it leaks into the space nearer to the member, the amount is no longer small. If there is a third porous elastic member, the leakage of the infused liquid to the outside will be the same as for the second porous elastic member. Is blocked.

In this way, the pouring liquid can be reliably shielded by the plurality of porous elastic members mounted near the body of the pouring fixing type supporting member body, so that the pouring liquid leaks to the outside during the pouring operation. As a result, there is no possibility of inadequate filling of the injection liquid in the gap between the body of the liquid injection fixing type support member and the borehole. In addition, unlike the case where the body of the liquid injection fixing type supporting member is self-drilling type, there is no need to pack waste cloth or quick-setting cement, and the work load on site is greatly reduced.

Further, in a liquid injection fixing type supporting member having a liquid injection fixing type supporting member main body such as a lock bolt, an anchor, a grout tube, etc., which is hollow and provided with one or a plurality of ejection ports at its tip or the like, Provided near the body of the liquid-fixing type supporting member main body are a plurality of porous elastic members mounted so as to wrap around the outer peripheral surface while leaving a gap in the axial direction, and to the liquid-fixing type supporting member main body between the porous elastic members. Drill a spout. As a result, when the injection fixing type support member main body is driven into the ground and then the injection liquid is injected, first, the injection liquid enters the space between the porous elastic members from the jet outlet near the hand, and the porous elastic member is injected. It also penetrates into the members. If the ejection port is not so large, the pressure applied to the porous elastic member is weak and the permeation speed is slow, so hardening proceeds. After that, the injection liquid enters the bore hole from the ejection port such as the tip of the body of the liquid injection fixing type supporting member, and the space on the tip side of the porous elastic member closest to the tip of the body of the liquid fixing fixing type supporting member is filled with the injection liquid. Will be done. When the space is filled with the injection liquid, a high pressure is applied to the porous elastic member closest to the tip, but since the range over the plurality of porous elastic members has already hardened, a sufficient shielding effect is exerted, The injected liquid does not leak outside. Therefore, the inside of the borehole is hardened when it is filled with the injection liquid, and the desired supporting strength is achieved.As a conventional packer used, the packer is broken, so that leakage is prevented and waste cloth or quick-setting cement is filled. There is no need to do it, and on-site work can be performed easily.

In addition, in a liquid injection fixing type supporting member having a liquid injection fixing type supporting member main body such as a lock bolt, an anchor, a grout tube, etc., which is hollow and has one or a plurality of jet ports at its tip or the like, Provide one or more porous elastic members mounted so as to wrap around the outer peripheral surface near the body of the liquid fixing type supporting member main body, and at the place where the multi-hole elastic member of the liquid fixing type supporting member main body is mounted. Since the ejection port was bored, when the injection liquid was injected after the main body of the liquid injection fixing type support member was driven into the ground, the injection liquid was first injected into each porous elastic member from the ejection port near the hand. Penetrate. If the ejection port is not so large, the pressure applied to the porous elastic member will be weak and the permeation rate will be slow, so hardening will proceed. After that, the injection liquid enters the borehole from the ejection port such as the tip of the main body of the injection fixing type support member, and the space between the support member and the porous elastic member is filled with the injection liquid. When the space is filled with the injection liquid, a high pressure is applied to the porous elastic member, but the porosity elastic member has already hardened to some extent, and the injection liquid permeates the porous elastic member first. Since the pressure of the jet outlet is also increased and the porous elastic member is pressed against the hole wall side, a sufficient shielding effect is exhibited, and the injected liquid does not leak outside. Therefore, the inside of the borehole is hardened in a state where it is filled with the injecting liquid, and the desired supporting strength is achieved. There is no need to do it, and on-site work can be performed easily.

In addition, in a liquid injection fixing type support member having a liquid injection fixing type supporting member main body such as a lock bolt, an anchor, a grout pipe, etc., and one or a plurality of injection pipes mounted on the outer surface of the liquid injection fixing type supporting member main body. In the vicinity of the body of the liquid injection fixing type supporting member, a plurality of porous elastic members mounted so as to wrap around the outer peripheral surface while providing a gap in the axial direction are provided, and at least one injection pipe is provided between the porous elastic members. Since it has an ejection port that opens at the end, when the injection fixing type support member main body is driven into the ground and then the injection liquid is injected through the injection pipe, first, from the ejection port near the hand to the porous elastic member The injection liquid enters the space of and penetrates into the porous elastic member. If the ejection port is not so large, the pressure applied to the porous elastic member is weak and the permeation rate is slow, so hardening progresses. After that, the injection liquid enters the borehole from the other ejection port of the injection pipe, and the space on the tip side of the porous elastic member closest to the tip of the injection fixing type supporting member body is filled with the injection liquid. When the space is filled with the injection liquid, a high pressure is applied to the porous elastic member closest to the tip, but since the range over multiple porous elastic members has already been hardened, a sufficient shielding effect is exerted and injection is performed. The liquid does not leak outside. As a result, the inside of the borehole is hardened with the injection liquid filled, and the desired support strength is achieved.Therefore, as in the conventional case, the used packer broke, so leakage was prevented and waste cloth and quick-setting cement were used. You don't have to pack it, and you can easily perform on-site work.

Further, in a liquid injection fixing type supporting member having a liquid injection fixing type supporting member main body such as a lock bolt, an anchor and a grout pipe, and one or a plurality of injection pipes attached to an outer surface of the liquid injection fixing type supporting member main body. , One or more porous elastic members mounted so as to wrap around the outer peripheral surface were provided near the body of the liquid injection fixing type supporting member main body, and at least one injection pipe was mounted with the porous elastic member. Since there is a spout that opens at the location, when the injection fixing type support member main body is driven into the ground and then the injection liquid is injected through the injection pipe, first, each porosity is released from the spout near the hand. The injection liquid penetrates into the elastic material. If the ejection port is not so large, the pressure applied to the porous elastic member will be weak and the permeation rate will be slow, so hardening will proceed. After that, the injection liquid enters the borehole from the other ejection port of the injection pipe, and the space between the injection hole and the porous elastic member is filled with the injection liquid. When the space is filled with the injection liquid, a high pressure is applied to the porous elastic member, but the hardening of the porous elastic member has already progressed to some extent, and the injection liquid permeates into the porous elastic member first. Since the pressure of the ejected port is also increased and the porous elastic member is pressed against the hole wall side, a sufficient shielding effect is exhibited and the injected liquid does not leak outside. Therefore, the inside of the borehole is hardened with the injection liquid filled, and the desired supporting strength is achieved, so that the used packer broke and the leak was prevented and the waste cloth and quick-setting cement were packed. There is no need to worry, and on-site work can be done easily.

[Brief description of drawings]

FIG. 1 is an external perspective view of a liquid injection fixing type supporting member according to a first embodiment of the present invention.

FIG. 2 is an explanatory diagram of a method of mounting a porous elastic member on a lock bolt.

FIG. 3 is a first explanatory diagram showing a usage state of the first embodiment.

FIG. 4 is a second explanatory diagram showing a usage state of the first embodiment.

FIG. 5 is an external perspective view showing a modified example of the first embodiment.

FIG. 6 is a cross-sectional view of a liquid injection fixing type supporting member.

FIG. 7 is a diagram illustrating a usage state of another modification of the first embodiment.

FIG. 8 is a diagram illustrating a usage state of the second embodiment.

FIG. 9 is a configuration diagram of a modification of the second embodiment.

FIG. 10 is a configuration diagram of another modification of the second embodiment.

FIG. 11 is an explanatory diagram of a usage state of the third embodiment.

FIG. 12 is a configuration diagram of a modification of the third embodiment.

FIG. 13 is a block diagram of another modification of the third embodiment.

FIG. 14 is a configuration diagram of a liquid injection fixing type supporting member in which the second embodiment and the third embodiment are combined.

FIG. 15 is an explanatory diagram showing a usage example of a conventional lock bolt.

16 is a configuration diagram of the packer in FIG.

FIG. 17 is a configuration diagram of another type of packer.

[Explanation of symbols]

30, 30A Lock bolt 30B Self-drilling lock bolt 36, 38, 40 Porous elastic member 32, 34, 58, 60, 62, 64, 66, 68, 7
0, 72, 74 Jet port 42, 42A, 42B, 42C, 42D Injection fixing fixing support member 44, 440 Injection pipe

Claims (5)

[Scope of utility model registration request] 1. A liquid injection fixing type supporting member having a liquid injection fixing type supporting member main body such as a lock bolt, an anchor, a grout pipe, etc., with an axial space provided near the liquid injection fixing type supporting member main body. A liquid injection fixing type supporting member, comprising a plurality of porous elastic members mounted so as to wrap around the outer peripheral surface. 2. A liquid injection fixing type supporting member having a hollow liquid injection fixing type supporting member main body such as a lock bolt, an anchor, a grout tube, etc., provided with one or a plurality of jet holes at its tip or the like. Around the hand of the supporting member body, a plurality of porous elastic members mounted so as to wrap around the outer peripheral surface at intervals in the axial direction are provided, and a spout is provided in the liquid injection fixing type supporting member body between the porous elastic members. A liquid injection fixing type supporting member characterized by having been drilled. 3. A liquid injection fixing type supporting member having a hollow liquid injection fixing type supporting member main body such as a lock bolt, an anchor, a grout tube, etc., provided with one or a plurality of ejection ports at its tip or the like. Provide one or more porous elastic members mounted so as to wrap around the outer peripheral surface near the support member main body, and make a spout at the place where the porous elastic member of the liquid injection fixing type support member main body is mounted. A liquid injection fixing type support member characterized by being installed. 4. A liquid injection fixing type support member having a liquid injection fixing type supporting member main body such as a lock bolt, an anchor, a grout pipe, etc., and one or a plurality of injection pipes mounted on an outer surface of the liquid injection fixing type supporting member main body. , A plurality of porous elastic members mounted so as to wrap around the outer peripheral surface while providing a space in the axial direction near the body of the liquid injection fixing type supporting member main body, and at least one injection pipe between the porous elastic members. An injecting and fixing type supporting member, characterized in that it has an open ejection port. 5. A liquid injection fixing type support member having a liquid injection fixing type supporting member main body such as a lock bolt, an anchor and a grout tube, and one or a plurality of injection pipes mounted on the outer surface of the liquid injection fixing type supporting member main body. , One or more porous elastic members mounted so as to wrap around the outer peripheral surface are provided near the body of the liquid injection fixing type supporting member main body, and at least one injection pipe is opened at the position where the porous elastic member is mounted. A liquid injection fixing type supporting member, characterized in that it has a spout.