JPH0646100U - 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. By mounting a porous elastic member 36 on the outer surface of a predetermined portion of the lock bolt 30 on the proximal side, even if a part of the porous elastic member 30 is damaged during driving, the porous elastic member 36 is damaged. If 30 has a sufficient length, the gap between the bore hole and the lock bolt can be closed by the elastic restoring force, and the porous elastic member 30 will be visible when the injection liquid injected into the bore hole then seeps. Along with clogging or hardening, a sufficient shielding effect can be exerted.

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. It is designed to prevent collapse around the inner wall by fixing it with a prescribed injection liquid such as implantation, mortar, and fixing agent. 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. 8 shows an example of using a lock bolt in the case where a borehole is previously drilled in rock. 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. 9, 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. An injection corresponding to the mounting position of the packer 24 on the lock bolt 18 is performed. A hole 26 is formed in the pipe 20.

When the injection liquid (mortar, fixing agent, etc.) is injected from the injection pipe 20 while exhausting the air in the borehole from the exhaust pipe 22, the injection liquid enters the inside of the packer 24 from the hole 26 of the injection pipe 20, Enlarge the packer 24. This closes the gap between the lock bolt 18 and the bore hole 16 near the mouth of the lock bolt 18. On the other hand, the injection liquid also exits from the tip of the injection pipe 20 into the borehole, and fills the gap between the borehole 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.

When the injection liquid starts to leak from the exhaust pipe 22, the work is completed, and the injection of the injection liquid is stopped. After that, when the injected liquid hardens, the lock bolt 18 and the inner wall periphery are integrally fixed, and supported by the hard internal rock with the tip of the lock bolt hammered in, thereby preventing the collapse of the inner wall periphery.

FIG. 10 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 from the mouth, which requires extra time, and if the waste liquid cannot be prevented from leaking due to poor packing of the waste, the lock bolt 16 and the periphery of the inner wall may not be firmly fixed. 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, and the packer cannot be installed in the first place, and after driving, waste cloth or quick-setting cement is packed in the mouth of the bore hole. However, the work load was heavy and there was a risk that the injection liquid would leak out due to improper packing due to work variations.

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]

 In the present invention, the above object is achieved by mounting a porous elastic member or a water-absorptive member on the outer surface of a predetermined location of a liquid injection fixing type support member body such as a lock bolt, an anchor, and a grout pipe.

[0012]

[Action]

 According to the present invention, since the porous elastic member is easily compressed by an external force, there is no obstruction when driving the liquid injection fixing type supporting member, and at the time of driving, for example, the porosity elastic member Even if a part is damaged, if the porous elastic member has a sufficient length, the elastic restoring force can close the gap between the bore hole and the body of the liquid injection fixing type supporting member, and then the inside of the bore hole. In addition to clogging or hardening of the porous elastic member due to the seepage of the injection liquid to be injected into the body, it exhibits a sufficient shielding effect, so the injection liquid leaks and the injection fixing type support Poor filling of the injection liquid does not occur in the gap between the member body and the borehole. Therefore, as in the past, the packer should be inflated, leakage should be prevented if the packer is broken, and a rag or quick-setting cement should be filled in, as in the case of the self-drilling fixing fixing type support member body. This eliminates the need for it and greatly reduces the work load on site.

Further, since the water-swelling expansive member is mounted on the outer surface of the predetermined position of the liquid-pouring fixing type supporting member main body, after the completion of driving, the water-swelling expansive member is water-expanded to make the borehole and the liquid filling. It is possible to reliably shield the gap between the fixing type supporting member bodies in a short time.

Further, a porous elastic member or a water-swelling expansive member that has been contracted by compression is attached to the outer surface of a predetermined location of the liquid injection fixing type supporting member body such as a lock bolt, an anchor, a grout pipe, etc. It is possible to release the porous elastic member or water-swellable member from the contracted state at a specified time by removing or breaking the holding member to hold the elastic material or the water-swellable member so as to keep it in the contracted state. Since it is configured so that it is formed in advance, when inserting and fixing the liquid injection fixing type supporting member into the pre-drilled bore hole, while pouring the porous elastic member or water absorbing expansive member, The liquid fixing type supporting member can be easily inserted and driven into the bore hole, which simplifies the on-site work, and after the driving, the holding member can be removed or destroyed, or the porous elastic member can be removed. Alternatively, it is possible to easily close the gap between the bore hole and the liquid injection fixing type supporting member main body by elastically restoring the water absorbing expansion member and further absorbing and expanding the water absorbing expansion member. Even in the case of the self-drilling liquid-fixing type supporting member body, by making the holding member removable and having sufficient strength, the pouring due to the rotation of the liquid-fixing type supporting member is possible. It is possible to prevent the elastic member or the water-absorbent expansive member from being damaged.If the holding member is removed after the completion of driving, the porous elastic member or the water-absorbent expansive member will elastically restore, and the water-absorbent expansive member will be further absorbed and expanded. By doing so, the gap between the borehole and the body of the liquid injection fixing type supporting member can be surely closed, and the work of filling waste cloth or quick-setting cement becomes unnecessary.

A water-swellable expansive member is attached to an outer surface of a fixed location of the liquid-fixing type supporting member body such as a lock bolt, an anchor, and a grout pipe, and the outer surface of the water-swellable expansive member is removable. Since the water-swellable member is protected against damage when it is driven in, it is possible to prevent leakage of the injecting liquid more reliably.

[0016]

【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 shows a rocking bolt of a type that is inserted into a bore hole previously drilled in a rock bed and used as a main body for injecting and fixing a supporting member. In FIG. 1, reference numeral 30 denotes a lock bolt, and an injection pipe 32 for injecting an injection liquid into a borehole along an outer surface of the lock bolt along a longitudinal direction, and an exhaust pipe for exhausting air from the borehole. 34 is attached by tape winding or the like. Reference numeral 36 denotes a porous elastic member having a predetermined length and a predetermined thickness, which is adhered so as to wrap a predetermined portion on the hand side (corresponding to the mouth side of the borehole) of the lock bolt 30 together with the injection pipe 32 and the exhaust pipe 34. Is. The porous elastic member 36 may be, for example, an ordinary sponge material (open-celled body) or a member having water-swelling expansibility. The thickness of the porous elastic member 36 is such that the outer diameter after being bonded to the lock bolt 30 is sufficiently larger than the hole diameter of the borehole, and when it is inserted into the borehole, it is ensured that the hole wall is not disturbed. The space between the lock bolt 30 and the borehole can be closed.

To attach the porous elastic member 36 to the lock bolt 30, as shown in FIG. 2, a cylindrical one is fitted into the lock bolt 30 in advance, or a prismatic one is attached to the lock bolt 30. Wrap it around.

If the injection pipe 32 and the exhaust pipe 34 have a large outer diameter and a gap is formed between the porous elastic member 36 and the lock bolt 30, as shown in FIG. 3, filling of foam plastic or the like is performed. It suffices to fill the gap with the material 38, and the filling material 38 can shape the cross-sectional shape of the porous elastic member 36 after being bonded to the lock bolt 30 into a shape closer to a circle.

FIG. 4 is an explanatory view of a 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. 4 (1)). Next, the liquid injection fixing type supporting member in which the lock bolt 30, the injection pipe 32, the exhaust pipe 34, and the porous elastic member 36 are integrated is inserted into the bore hole 16 and driven (see FIG. 4 (2)). At this time, since the porous elastic member 36 is easily compressed by the external force received from the hole wall, it does not hinder the insertion and the driving. Even if the portion is damaged, the thickness of the porous elastic member 36 is such that the outer diameter after bonding to the lock bolt 30 is made sufficiently larger than the hole diameter of the bore hole, so that the porous elastic member 36 has a sufficient length. If so, the elastic restoring force can surely close the gap between the bore hole 16 and the lock bolt 30.

After that, while injecting the injection liquid (mortar, fixing agent, etc.) from the injection pipe 32 while exhausting the air in the bore hole from the exhaust pipe 34, the injection liquid is discharged from the tip of the injection pipe 32 into the bore hole. As a result, the gap between the bore hole 16 and the lock bolt 30 is filled. At this time, the air in the borehole 16 is exhausted into the tunnel 12 through the exhaust pipe 34 (see FIG. 4C). As the injection into the borehole 16 progresses, the injection liquid permeates into the porous elastic member 36, the porous elastic member 36 is clogged, and the injection liquid is hardened inside the porous elastic member 36. In the vicinity of the mouth of the borehole 16, the gap between the lock bolt 30 and the borehole 16 is sufficiently shielded. Therefore, the injection liquid does not leak from the mouth of the bore hole 16 and the filling failure of the injection liquid between the lock bolt 30 and the bore hole 16 does not occur. Therefore, unlike the conventional case, it is not necessary to inflate the packer or to prevent leakage when the packer is broken, and the work load on site is greatly reduced.

When the injection liquid starts to leak from the exhaust pipe 34, the work is completed, and the injection of the injection liquid is stopped. After that, if the entire injected liquid in the borehole 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 collapse of the inner wall periphery. Is prevented.

The porous elastic member 36 may be attached to the lock bolt 30 by adhesion, or may be attached by winding a tape at both ends. Also, if the porous elastic member is replaced with a water-swelling expansive member having less elasticity, the cross-sectional outer diameter of the water-swelling expansive member attached to the lock bolt is made smaller than the hole diameter of the borehole in advance, so that the borehole is formed. Inserting and supporting the liquid injection fixing type supporting member can be performed smoothly, the water absorbing expansive member is less likely to be damaged, and after the driving is completed, the water absorbing expansive member absorbs water, injection liquid, etc. By inflating it, the gap between the borehole and the lock bolt can be shielded more reliably in a short time. Of course, if the water-swellable member has a relatively large elasticity, the cross-sectional outer diameter of the water-swellable member mounted on the lock bolt can be set to be equal to or larger than the hole diameter of the bore hole.

Further, as shown in FIG. 5, the square porous elastic member 36 is put into a bag body 40 formed of a vinyl sheet or the like, and the air inside is sucked from the mouth by a pump or the like to obtain the porous elastic member. After the member 36 is compressed at atmospheric pressure and sufficiently reduced, the mouth of the bag body 40 is sealed (for example, if a heat-meltable resin sheet is attached to the inner surface of the bag body, it can be heat-sealed). ). Then, while the bag body 40 is used as a holding member that keeps the porous elastic member 36 in a contracted state, the bag body 40 is wrapped around the bag body while being adhered to a predetermined position of the lock bolt 30 to form a liquid injection fixing type support member. . By doing so, since the porous elastic member 36 becomes thin, the liquid injection fixing type supporting member can be easily inserted and driven into the bore hole, which simplifies the site work and, after the insertion, the bag 40. Since the porous elastic member 36 is elastically restored when the break is broken (air, water, etc. may be sent into the bag body 40 to facilitate the restoration), so that the gap between the bore hole and the lock bolt 30 can be easily closed. You can

FIG. 6 is a cross-sectional view of the liquid injection fixing type supporting member according to the second embodiment of the present invention with a part thereof omitted. FIG. 6 shows a self-drilling lock bolt of the type in which the rock bit is drilled by the bit at the tip while rotating itself as the main body of the liquid injection fixing type support member. Reference numeral 30A is a hollow self-drilling lock bolt, which is designed to press the injection liquid into the borehole through the hollow interior 42, and does not require an injection pipe or an exhaust pipe. Reference numeral 36 is a porous elastic member having a predetermined length and a predetermined thickness, which is adhered so as to wrap around a predetermined portion of the self-drilling lock bolt 30A on the hand side (the mouth side of the borehole). The porous elastic member 36 may be, for example, a normal sponge material (open-cell body), but may be a member having a water-absorbing expansivity. The thickness of the porous elastic member 36 is such that the outer diameter at the stage of being bonded to the self-piercing lock bolt 30A (before covering with a collar described later) is larger than the hole diameter of the bore hole.

Reference numeral 44 denotes a collar composed of a thin-walled steel pipe removably covered on the outer side of the porous elastic member 36, a plastic pipe having rigidity, etc., and the outer diameter of the collar 44 is made slightly smaller than the bore diameter of the bore hole. , So as not to hinder the drilling work. By covering the porous elastic member 36 with the collar 44, the porous elastic member 36 is compressed and brought into a contracted state, so that it is possible to save the trouble of compressing and contracting by suction as shown in FIG. Further, the collar 44 covering the porous elastic member 36 can be easily removed by applying an external force and pulling it out.

FIG. 7 is an explanatory diagram of a usage state of the second embodiment. The self-drilling rock bolt 30A equipped with the porous elastic member 36 and the collar 44 is rotated by the rock drill 48 through the adapter 46, and the rock is excavated with the bit 50 mounted on the tip of the self-drilling lock bolt 30A. While driving, it is driven to a predetermined depth (see Fig. 7 (1)). At this time, since the porous elastic member 36 is in the contracted state and is protected by the collar 44 having a smaller outer diameter than the bore diameter of the bore hole 16 drilled by the bit 50 and having strength, it prevents the driving operation. In addition, the porous elastic member 36 is not damaged. Further, since the collar 44 is pushed by the adapter 46, the collar 44 will not come off from the porous elastic member 36 even if the self-drilling lock bolt 30A is driven into the rock.

When the driving of the self-drilling lock bolt 30A is completed, the adapter 46 and the color 44 are removed (see FIGS. 7 (2) and 7 (3)). Then, the porous elastic member 36 is elastically restored, and the gap between the bore hole 16 and the self-drilling rock bolt 30A near the mouth of the bore hole 16 can be closed. When the self-drilling lock bolt 30A is driven in, the porous elastic member 36 is covered with the collar 44, so that the porous elastic member 36 is not damaged, and the gap can be surely closed. The length of the porous elastic member 36 can be shorter than that of the first embodiment shown in FIG.

After that, when the injection liquid (mortar, fixing agent, etc.) is press-fitted through the hollow interior 42 of the self-drilling lock bolt 30A, the injection liquid comes out from the tip of the self-drilling lock bolt 30A into the bore hole, The gap between the bore hole 16 and the self-drilling lock bolt 30A is filled (see FIG. 7 (4)).

As the injection into the borehole 16 progresses, the injection liquid permeates into the porous elastic member 36, the porous elastic member 36 is clogged, and the injection liquid is cured inside the porous elastic member 36. Therefore, in the vicinity of the mouth of the borehole 16, the gap between the self-drilling lock bolt 30A and the borehole 16 is sufficiently shielded. Therefore, the injection liquid does not leak from the mouth of the bore hole 16 and the filling failure of the injection liquid between the lock bolt 30 and the bore hole 16 does not occur. Therefore, unlike the conventional method, it is not necessary to pack waste and quick-setting cement, and the work load on site is greatly reduced.

When the infusion liquid starts to seep out from the porous elastic member 36, the work is completed, and the injection of the infusion liquid is stopped. After that, if the whole injection liquid in the borehole hardens, the self-drilling rock bolt 30A and the periphery of the inner wall of the tunnel are integrally fixed, and the inner wall is supported by the hard internal rock with the tip of the self-drilling rock bolt. The collapse of the surrounding area is prevented.

The porous elastic member 36 may be attached to the self-piercing lock bolt 30A by adhesion, or may be attached by winding a tape at both ends. Also, if the porous elastic member is replaced with a water-swelling and expansive member that does not have much elasticity, the collar can be easily covered and at the same time, the self-drilling lock bolt is driven in and the collar is removed, then water or pouring is applied. By absorbing the liquid etc. into the water-absorptive expansive member and expanding it, the gap between the bore hole and the self-drilling lock bolt can be more reliably shielded in a short time. Also, if the porous elastic member (including the water-absorptive member having relatively large elasticity) is previously compressed and contracted in the bag body as in FIG. 5, the collar can be easily covered. You can also Further, also in the self-drilling lock bolt, as in the case of the first embodiment, the porous elastic member and the water-absorptive member are simply attached to the outer surface of the self-drilling lock bolt, and the collar is not provided. Good.

In each of the above-mentioned embodiments, the rock bolts used in the tunnel construction etc. by the NATOM method are mentioned as an example, but in the anchors used for the retaining wall construction, the ground improvement work and the ground reinforcement work etc. The present invention can be similarly applied to other types of liquid injection fixing type supporting member bodies such as grout tubes used.

[0033]

As described above, according to the present invention, the porous elastic member is attached to the outer surface of the body of the liquid injection fixing type supporting member such as the lock bolt, the anchor, the grout pipe, etc. Since it is easily compressed by external force, there is no obstacle when driving the liquid injection fixing type supporting member, and even if a part of the porous elastic member is damaged at the time of driving, If the elastic material has a sufficient length, the elastic restoring force can close the gap between the borehole and the body of the liquid injection fixing type support member, and then the infusion liquid injected into the borehole will seep. In addition to clogging or hardening of the porous elastic member, the injection liquid leaks and is injected into the gap between the injection fixing type support member body and the bore hole. Poor filling of liquid It never happens. Therefore, as in the conventional case, the packer should be inflated, leakage should be prevented if the packer is broken, and waste cloth or quick-setting cement should be filled in, as in the case of the self-drilling fixing fixing type support member body. This eliminates the need for work and greatly reduces the work load on site.

Further, since the water-swelling expansive member is attached to the outer surface of the predetermined position of the liquid-pouring fixing type supporting member main body, after the completion of driving, the water-swelling expansive member is expanded by pouring water or the like to form the borehole. The gap between the body of the liquid injection fixing type supporting member can be more surely shielded in a short time.

Further, a porous elastic member or a water-swelling expansive member that has been contracted by compression is attached to the outer surface of a predetermined location of the liquid injection fixing type supporting member body such as a lock bolt, an anchor, a grout pipe, etc. It is possible to release the porous elastic member or water-swellable member from the contracted state at a specified time by removing or breaking the holding member to hold the elastic material or the water-swellable member so as to keep it in the contracted state. Since it was configured to be formed in advance, when inserting and supporting the liquid injection fixing type support member into the pre-drilled bore hole, the porous elastic member or the water absorbing expansive member is kept in the contracted state before pouring. The liquid fixing type supporting member can be easily inserted and driven into the borehole, which simplifies the work at the site and, after the driving, removes the holding member or breaks it so that the porous elastic member or It is possible to easily close the gap between the bore hole and the main body of the liquid injection fixing type supporting member by elastically restoring the water absorbing expansive member and further absorbing and expanding the water absorbing expansive member. Even in the case of the self-drilling liquid-fixing type supporting member main body, by removing the holding member and providing sufficient strength, the pouring due to the rotation of the liquid-fixing type supporting member is possible. It is possible to prevent damage to the elastic material or the water-swellable member, and if the holding member is removed after the driving is completed, the porous elastic member or the water-swellable member will recover elastically. The gap between the borehole and the body of the liquid fixing fixing support member can be surely closed by absorbing water, and the work such as packing waste cloth and quick-setting cement is unnecessary.

Further, a water absorbing expansive member is attached to an outer surface of a predetermined position of the liquid injection fixing type supporting member main body such as a lock bolt, an anchor, a grout pipe, etc., and the outer surface of the water absorbing expansive member is removable. Since the water-swellable member is protected against damage when it is driven in, it is possible to prevent leakage of the injecting liquid more reliably.

[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 cross-sectional view of the liquid injection fixing type supporting member of FIG.

FIG. 4 is an explanatory view of a usage state of the liquid injection fixing type supporting member of the first embodiment.

FIG. 5 is a diagram illustrating a modified example of the first embodiment.

FIG. 6 is a cross-sectional view of the liquid injection fixing type supporting member according to the second embodiment of the present invention with a part thereof omitted.

FIG. 7 is an explanatory view of a usage state of the liquid injection fixing type supporting member of the second embodiment.

FIG. 8 is an explanatory diagram showing an example of use of a conventional liquid injection fixing type supporting member.

9 is a configuration diagram of the packer in FIG.

FIG. 10 is a configuration diagram of another type of packer.

[Explanation of symbols]

 30 lock bolt 30A self-drilling lock bolt 36 porous elastic member 40 bag body 44 collar

Claims (3)

[Scope of utility model registration request] 1. A liquid injection fixing type supporting member main body such as a lock bolt, an anchor or a grout tube, and a porous elastic member or a water absorbing expansive member mounted on an outer surface of a predetermined portion of the liquid injection fixing type supporting member main body. A liquid injection fixing type support member characterized by being provided with. 2. A liquid injection fixing type supporting member main body such as a lock bolt, an anchor, a grout tube, etc., and a porous elastic member attached to an outer surface of a predetermined portion of the liquid injection fixing type supporting member main body, which is in a contracted state by compression. Or a water-swellable member and a holding member for holding the porous elastic member or the water-swellable member so as to keep the contracted state. The liquid injection fixing type supporting member, wherein the member or the water-swellable member is formed to be releasable from the contracted state. 3. A liquid injection fixing type supporting member main body such as a lock bolt, an anchor, a grout pipe, etc., a water absorbing expansive member mounted on an outer surface of a predetermined portion of the liquid injection fixing type supporting member main body, and the water absorbing expansivity And a protection member for protecting an outer surface of the member, wherein the protection member is detachable.