KR20060109285A - Expandable injection bolt and grouting method using same - Google Patents

Abstract

An expandable injection bolt (1A) comprising an expandable section (3), which has a tubular shape capable of applying an internal pressure form a rear end portion and expands in a radial direction when the internal pressure is applied, and an injection port forming section (9A) which opens an injection port (7) when the internal pressure is applied, wherein the expandable section (3) is expanded by the internal pressure so as to tightly adhere to ground, then the injection port forming section (9A) is caused to open the injection port (7), and a grout can be injected into the ground through the injection port (7) to reinforce the ground.

Description

Expansion injection bolt and injection method using it {EXPANDABLE INJECTION BOLT AND GROUTING METHOD USING SAME}

The present invention is, for example, expansion reinforcing bolt used in combination with the rock bolt and the injection pipe of the injection material in the reinforcement work of Jisan during tunnel construction, and the like It relates to the injection method used.

Conventionally, a hole is drilled in the surface of Jishan by means of a cutting machine, an injection tube is inserted into the cutting hole to inject a curable injection material such as cement milk, and then is forced into the cutting hole. Iv) Insert the bolt-type rock bolt, harden the curable injection material to fix the rock bolt, and tighten the bolt part of the rock bolt protruding from the hole to the outside through the support plate with a nut. The method of implementation is known (for example, refer Unexamined-Japanese-Patent No. 2000-303480).

Moreover, as a lock bolt which can be fixed without using a curable injection material, the front end part is closed and it has a tubular shape which has a supply opening in a rear end part, Expansion bolts with expansion portions that expand in the radial direction by applying internal pressure are known (see, for example, Japanese Patent Publication No. 520, 1990). After the expansion bolt is inserted into the hole, an internal pressure is applied, whereby an expansion portion having a cross-sectional shape in which a part of the plastic pipe that can be plastically deformed is pushed inward is expanded in the radial direction to be in close contact with the hole.

However, in the case of a forced bolt-type rock bolt fixed by the curable injection material, there are the following problems.

In order to inject and reinforce the curable injection material into the ground around the hole, it is necessary to seal the gap between the injection pipe and the cutting hole opening sufficiently to supply the curable injection material at high pressure, and to sufficiently infiltrate the curable injection material into the surrounding ground. However, this seal is not only difficult to implement, but the seal must be removed when the injection tube is inserted, and the seal must be removed when the injection tube is pulled out and removed, resulting in poor workability. In particular, when there is spring water, even if the curable injection material is injected, the curable injection material flows down before hardening, and it becomes difficult to fix the rock bolt. Moreover, it is easy to generate a deformation | transformation of a fatty acid before hardening injection material hardens | cures, and the range from which a fatty acid recedes easily becomes large.

On the other hand, in the case of the expansion bolt, since it can be fixed without using the curable injection material, there is an advantage that the above problems do not occur.

However, in the case of the expansion bolt, when the surrounding ground is fragile, there is a problem that even if the expansion portion is expanded, the fixing force is insufficient and the reinforcing effect is easily insufficient. This can be solved by injecting the curable injection material into the hole by using an injection tube and injecting the curable injection material into the surrounding ground and strengthening it, similarly to the steel bolt of the steel bolt type. The same problem occurs with the type lock bolt.

This invention is made | formed in view of the said conventional problem, and aims at making it possible to easily strengthen the surrounding ground by injection | pouring of a curable injection | pouring material, while still having the advantage of an expansion bolt.

     For this purpose, the present invention is an expansion injection bolt having a tubular shape capable of applying internal pressure from the rear end, an expansion part for expanding in the radial direction by applying internal pressure, and an injection hole forming part for opening the injection port by applying internal pressure. To provide.

The inflation injection bolt according to the present invention can expand the inflation portion by bringing the internal pressure into close contact with the ground, and can also open the inlet opening in the inlet formation portion. After the close contact with the ground and the opening of the injection hole, the curable injection material can be injected into the surrounding ground through the opening by injecting the curable injection material from the rear end of the expansion injection bolt.

As described above, the inflation injecting bolt according to the present invention can inject the curable infusion material even in the presence of spring water, since the inflation portion expands and adheres to the ground and can seal between the inflation injecting bolt and the ground. It is possible to water still without waiting for hardening. In addition, the seal can prevent leakage of the curable injection material, and the workability of the curable injection material is good, and the surrounding ground can be strengthened by the injection of the curable injection material. Is obtained.

In addition, since the expansion injection bolt according to the present invention remains as a lock bolt after the injection of the curable injection material, the seal is maintained even after the injection of the curable injection material, and the outflow of the curable injection material can be prevented even at the spring water point. In addition, the expansion injection bolt according to the present invention is hardly curable because, even when the surrounding ground is fragile, if the expansion portion is inflated and closely adhered to the ground, even though it is insufficient, it is possible to obtain some reinforcing effect without waiting for injection curing of the curable injection material. It is possible to suppress the dropping of the fatty acid until the injection material is cured.

The inflation injection bolt according to the present invention uses a holding sleeve that is broken by internal pressure as an injection hole forming part, a cap and a cap sleeve that are separated by internal pressure, It is largely divided into using external structure. These details and advantages are mentioned later.

In addition, the present invention, by inserting the expansion injection bolt according to the present invention in the ground, by applying internal pressure to the expansion injection bolt to expand the expansion portion and opening the injection port, and supplying a curable injection material to the expansion injection bolt, the opening injection hole It is also to provide an injection method for injecting a curable injection material around.

The injection method according to the present invention is a method utilizing the characteristics of the expansion injection bolt of the present invention, as described above, early index of spring water, prevention of leakage and outflow of the curable injection material, before the curable injection material is cured Ground reinforcement work by injection | pouring of a curable injection material can be carried out, aiming at suppressing falling off etc.

In addition, embodiment of the injection method which concerns on this invention, and another advantage are mentioned later.

BRIEF DESCRIPTION OF THE DRAWINGS The perspective view which abbreviate | omitted the intermediate part which shows 1st Embodiment of the expansion injection bolt which concerns on this invention.

2 is a plan view of the expansion injection bolt shown in FIG.

3 is a cross-sectional view of the expansion injection bolt shown in FIG.

4A and 4B are explanatory views of the distal end portion of the expansion injection bolt shown in FIG. 1, FIG. 4A is an enlarged cross-sectional view, and FIG. 4B is a distal front view.

It is a figure which shows the formation process of a cutting hole.

6A and 6B are views showing the process of inserting the expansion injection bolt into the hole, Figure 6A is a view showing the expansion injection bolt inserted into the hole, Figure 6B is an enlarged cross-sectional view of the expansion portion in Figure 6A.

7A and 7B are views showing the expansion process of the expansion injection bolt, Figure 7A is a view showing the expansion injection bolt inflated expansion portion in the hole, Figure 7B is an enlarged cross-sectional view of the expansion portion in Figure 7A.

8A to 8C are views illustrating an injection hole forming process, FIG. 8A is a view showing an expansion injection bolt in which an injection hole is opened in a cutting hole, FIG. 8B is an enlarged perspective view of the vicinity of an injection hole forming portion immediately before the opening of the injection hole, and FIG. 8C is an injection hole. Is an enlarged perspective view of the vicinity of the injection hole forming portion, which is opened.

It is a figure which shows the injection process of a curable injection material.

10 is a diagram illustrating another example of the injection hole forming step.

It is sectional drawing which shows 2nd Embodiment of an injection hole formation part.

It is sectional drawing which shows 3rd Embodiment of an injection hole formation part.

It is sectional drawing which shows 4th Embodiment of an injection hole formation part.

14 is a perspective view in which an intermediate portion showing a second embodiment of the expansion injection bolt according to the present invention is omitted.

It is explanatory drawing in the case of locally applying internal pressure using a packer for opening the injection port formation part shown in FIG.

It is a perspective view which abbreviate | omitted the intermediate part which shows 3rd Embodiment of the expansion injection bolt which concerns on this invention.

17 is an external view showing a fourth embodiment of the expansion injection bolt according to the present invention.

18A and 18B are cross-sectional views of the rear end (supply side of the curable injection material) and the front end (the deepest part side of the cutting hole) of the expansion injection bolt shown in FIG. 17.

19A to 19C are cross-sectional views of A-A ', B-B', and C-C 'shown in FIGS. 18A and 18B.

20-22 is sectional drawing of the other structural example of the injection-port formation part which consists of a sleeve for a cap, and a cap which can be used by this invention, respectively.

Fig. 23 is a cross sectional view of the distal end portion of the inflation injecting bolt that becomes the rear end side after the connection is extended;

24 is a cross-sectional view of the rear end of the expansion injection bolt, which becomes the leading end side after the connection extension.

25A and 25B are explanatory views of the connection part of the expandable expansion injection bolt, FIG. 25A is a sectional view of the connection part of the two expansion injection bolt parts, and FIG. 25B is an external view of the connection part of the two expansion injection bolt parts.

Fig. 26A and Fig. 26B are cross-sectional views each showing an example of the configuration of an attachment attached to the expansion injection bolt and used.

It is a figure which shows the formation process of a cutting hole.

28A and 28B are views showing a process of inserting an expansion injection bolt into a hole, FIG. 28A is a view showing an expansion injection bolt inserted into a hole, and FIG. 28B is a sectional view taken along line A-A 'in FIG. 28A.

29A and 29B are views illustrating an expansion process of the expansion injection bolt, FIG. 29A is a view showing the expansion injection bolt in which the expansion portion is expanded in the hole, and FIG. 29B is a sectional view taken along line A-A 'of FIG. 29A.

It is a figure which shows the injection hole formation process and shows the state which removed the cap by applying higher internal pressure.

Fig. 31 is a sectional view of the vicinity of a face in a tunnel construction using the injection method of the present invention.

32 is a front view of the face.

       EMBODIMENT OF THE INVENTION Hereinafter, this invention is demonstrated based on drawing.

BRIEF DESCRIPTION OF THE DRAWINGS The perspective view which abbreviate | omitted the intermediate part which shows 1st Embodiment of the expansion injection bolt which concerns on this invention, FIG. 2 is a top view of the expansion injection bolt shown in FIG. 1, FIG. 3 is sectional drawing of the expansion injection bolt shown in FIG. 4A and 4B are enlarged cross-sectional views and an enlarged front view of the distal end portion of the expansion injection bolt shown in FIG. 1.

As shown in FIGS. 1-3, the expansion injection bolt 1A of this embodiment is integrally continuous in front of the mouth sleeve 2 formed in the rear end, and the front of this mouse sleeve 2 It has a tubular shape with an inflated portion 3 therein, and is capable of applying internal pressure via the mouse sleeve 2.

The mouse sleeve 2 has a cylindrical shape whose diameter does not substantially increase even by the internal pressure, communicates with the space in the expansion part 3, and is open in the axial direction. Moreover, the screw sleeve 5 is formed in the inner peripheral surface of the mouse sleeve 2, and is integrated with the expansion part 3 by the overlay weld 4. As shown in FIG. This screw part 5 is a mechanism used for the pressure-resistant supply mentioned later, supply of a curable injection | pouring material, the formation operation of the injection hole 7 (refer FIG. 8A and FIG. 8C) by the drilling tool 6 (refer FIG. 10), and the like. It is supposed to be connected. Although the screw part 5 in the example shown is formed in the inner peripheral surface of the mouse sleeve 2, you may form in the outer peripheral surface.

As can be seen from the cross-sectional portion of FIG. 1, the expanded portion 3 pushes a portion of the original tube inward along the axial direction, and has a C-shaped cross section having the curved pressed-in portion 8. It has a structure that makes up. The expansion portion 3 is capable of expansion in the radial direction by applying an internal pressure to push the indentation portion 8 outward.

The expansion part 3 of the expansion injection bolt 1A is made of a plastically deformable material which enables the above expansion and maintains this expansion shape even after releasing the internal pressure. Although metal, such as iron, copper, aluminum, or these alloys, can be used specifically, It is preferable to comprise with the steel pipe excellent in strength generally. Moreover, depending on a use, it can also be comprised from flexible materials, such as rubber | gum and synthetic resin, or the material which used these for the base material.

The expansion part 3 in this embodiment is continuous from the said mouse sleeve 2 vicinity to the front-end | tip, and the front-end | tip part of the expansion part 3 becomes 9 A of injection port formation parts. The injection hole formation part 9A forms the injection hole 7 (refer FIG. 8A and FIG. 8C) for inject | pouring the hardening injection material mentioned later into a ground by internal pressure, and the injection hole formation part 9A of this embodiment is And a breakable holding sleeve 10 cocked at the tip of the inflation section 3, and an embrittlement section formed in the inflation section 3 in the area where the holding sleeve 10 is caulked. It is not distinguished from other parts on drawing, and the welding part 11 (refer FIG. 3, FIG. 4A, 4B) which occludes the front end opening part of the expansion part 3 is provided.

On both ends of the holding sleeve 10 cocked at the distal end of the inflation section 3, on the indentation port (approximately C-shaped discontinuity) of the indentation section 8 formed in the inflation section 3 Slits 12 are formed at corresponding positions. Although this slit 12 is not essential, it is preferable to form in order to make it easy to adjust the breaking pressure of the holding sleeve 10 mentioned later. The holding sleeve 10 may be made of the same material as that of the material constituting the inflation portion 3, but may be made of another material in order to adjust the breaking pressure to be described later.

In particular, as shown in FIGS. 4A and 4B, the tip opening of the expanded portion 3 is closed by a welded portion 11 that can suppress the diameter from expanding by pushing the indented portion 8. This welding part 11 follows the substantially C-shaped shape of the front end of the expansion part 3, and does not connect the indentation part of the indentation part 8, but between the front end of the expansion part 3 and the holding sleeve 10. The tip opening of the expansion part 3 is formed and covered. Therefore, when internal pressure is applied to the inflation section 3, as shown by the arrow in Fig. 4B, the tip of the inflation section 3 does not enlarge in diameter, but a force is applied to the left and right from the indentation opening, so that the slit ( The holding sleeve 10 can be broken through 12).

Some or all of the tip portion of the inflated portion 3 to which the holding sleeve 10 is caulked is a brittle portion (not distinguished from other portions on the drawing) physically or chemically weakened. This embrittlement portion refers to a portion where tearing and cracking are likely to occur so as to break along with the breaking of the holding sleeve 10 and to open the injection port 7 (see FIGS. 8A and 8C).

The embrittlement unit is, for example, work hardening by drawing processing or the like, weakening by heating or cooling treatment, weakening by hydrogen gas or acetylene gas, weakening by carburizing treatment or acid or alkali treatment, And combinations thereof. For example, the brittle part by work hardening can be formed by caulking the holding sleeve 10 and reducing the diameter of the inflation part 3 of the said part. Moreover, the brittle part can also be formed by the heat at the time of forming the welding part 11.

In the present embodiment, the holding sleeve 10 is caulked until the diameter of the inflating portion 3 is reduced in the vicinity of the bottom of the press-fitting portion 8 that is weakened by work hardening at the time of its formation. By forming the weld part 11 together, it hardens | cures further and it is set as the embrittlement part. In addition, the bottom part vicinity of the press-fit part 8 is preferable as a embrittlement part in the point which a large force is easy to be applied by the breaking of the holding sleeve 10, as mentioned later.

In the expansion injection bolt 1A of the present embodiment, a sealing material 13 is wound on the outer circumferential surface of the vicinity of the rear end portion and the distal end portion of the expansion portion 3. As this sealing material 13, fabrics, such as a woven fabric and a nonwoven fabric, can also be used besides elastic materials, such as rubber and an elastomer. In the case where the sealing material 13 is an elastic material capable of following the expansion of the expansion part 3, the sealing material 13 may be brought into close contact with the outer circumferential surface of the expansion part 3, but in the case of using a fabric or the like, It is preferable to wind it loose enough to allow expansion of the inflation section 3. Moreover, it is preferable to fill the recessed part of the press-in part 8 also.

When the sealing material 13 is formed, the expansion part 3 is brought into close contact with the ground through the sealing material 13 with its expansion, so that the sealing property can be improved, thereby preventing leakage of the curable injection material and The index is more certain. In the present embodiment, the sealing material 13 is formed in two places near the rear end and in the vicinity of the front end, but the sealing material 13 is formed in only one place near the rear end, or the sealing material 13 in three or more places. ) May be formed.

Moreover, although the expansion injection bolt 1A of this embodiment is a series of inflation part 3 in front of the mouse sleeve 2, the rear end part and the front end part of the inflation part 3 shown are simple of appropriate length. A plurality of inflated portions 3 may be formed by pipes, and the inflated portion 3 is formed to be biased toward the front end side or the rear end side, or the plurality of inflated portions 3 are connected by a tubular material in a state of communicating with each other in the axial direction. It is also possible to set it as the expansion injection bolt 1A which has ().

Next, an example of the injection method of the present invention using the expansion injection bolt 1A described in Figs. 1 to 4A and 4B will be described.

5 to 9 are views showing a first embodiment of the injection method procedure of the present invention, FIG. 5 is a view showing a step of forming a hole, and FIGS. 6A and 6B show a step of inserting an expansion injection bolt into the hole. 6A is a view showing an expansion injection bolt inserted into the hole, Figure 6B is an enlarged cross-sectional view of the expansion portion in Figure 6A, Figures 7A and 7B shows an expansion process of the expansion injection bolt, Figure 7A is a cutting hole Fig. 7B is an enlarged cross-sectional view of the inflation portion in Fig. 7A, Figs. 8A to 8C are views illustrating an injection hole forming process, and Fig. 8A is an expansion injection bolt in which the injection hole is opened in the cut hole. 8B is an enlarged perspective view of the vicinity of the injection hole forming portion immediately before the opening of the injection hole, FIG. 8C is an enlarged perspective view of the vicinity of the injection hole formation portion, in which the injection hole is opened, and FIG. It is a figure which shows the injection process of a curable injection material. In these drawings, the same symbols as those in Figs. 1 to 4A and 4B denote the same members or parts.

First, as shown in FIG. 5, the cutting hole 15 of the required depth is formed with the cutting hole drill 14. As shown in FIG.

After forming the cutting hole 15, as shown to FIG. 6A, the expansion injection bolt 1A is inserted in the said cutting hole 15 from the front end side (inlet formation part 9A side), and is inserted in the ground. In this state, as shown in FIGS. 6A and 6B, the expansion injection bolt 1A is in a state in which the expansion part 3 is not expanded and there is room around the expansion part 3 and the sealing material 13. It is inserted in the hole 15.

In addition, in inserting the expansion injection bolt 1A into the ground, the formation of the cutting hole 15 is not essential, and for example, for the soft ground such as clay, the cutting hole 15 is not directly formed but is pushed directly by a hydraulic machine or the like. It is also possible to insert the expansion injection bolt 1A into the ground by inserting it.

Reference numeral 16 shown in Fig. 6A is an accessory for connecting a pressure hose 17 (see Fig. 7A) to be described later, and has a supply hole 18 for supplying pressure into the expansion injection bolt 1A. The pressure feed hose 17 can be connected in a state of communicating with the supply hole 18. The accessory device 16 is attached by turning the screw portion 44 to the screw portion 5 formed on the mouse sleeve 2 of the expansion injection bolt 1A. This accessory 16 may be attached before inserting the expansion injection bolt 1A into the cutting hole 15, or may be attached after insertion.

Next, as shown in FIG. 7A, the pressure feed hose 17 is connected to the accessory 16, and the internal pressure is applied to the expansion injection bolt 1A from the pressure feed hose 17 via the accessory 16. . This internal pressure is applied as the fluid pressure. For example, although it can also carry out by pressurized gas, such as compressed air, pressurized liquid which is easy to apply a big pressure, especially pressurized water is preferable.

As shown in Fig. 7B, the expansion injection bolt 1A expands in the radial direction due to the internal pressure and adheres to the inner circumferential surface of the cutting hole 15, so that the spring water from the cutting hole 15 Even if there is, it is possible to index this. Especially in the place where the sealing material 13 was formed, since this sealing material 13 raises a contact state, an index effect can be heightened further. In addition, due to the expansion of the expanded portion 3, even when the surrounding ground is fragile, a certain amount of fixing force of the expansion injection bolt 1A is obtained.

The inflation section 3 is preferably inflated at a pressure lower than the pressure at which the inlet 7 (see FIGS. 8A and 8C) is opened in the inlet formation section 9A. Specifically, it is preferable to inflate at a pressure higher than the minimum pressure necessary for obtaining the desired expansion and lower than the pressure for opening the injection hole 7 shown in Figs. 8A and 8C in the injection hole forming portion 9A. If the inlet 7 is opened before the expansion portion 3 is fully inflated, an internal pressure leak occurs, and since the internal pressure above this leak must be supplied (supplied with pressurized water), it becomes difficult to perform the expansion operation.

The inlet 7 shown in Figs. 8A and 8C is opened in the inlet port forming section 9A by supplying a higher pressure after expanding the inflated section 3 of the inflation injecting bolt 1A in the required amount.

The opening mechanism of the injection hole 7 in the injection hole forming portion 9A will be described.

First, as explained with reference to FIGS. 4A and 4B, the tip portion of the inflation section 3 in the present embodiment does not enlarge in diameter, but a force to be opened left and right from the indentation opening of the indentation section 8 is applied to this. As a result, the holding sleeve 10 can be broken through the slit 12. For this reason, if a pressure higher than the pressure necessary to obtain expansion is supplied, as shown in Fig. 8B, the tip of the expansion portion 3 breaks the holding sleeve 10 through the slit 12 and opens to the left and right. The bottom part of the indentation part 8 (see FIG. 1) is exposed while the welding part 11 deforms following the deformation of the holding sleeve 10. And the force of the direction shown by the arrow in a figure acts in the vicinity of the bottom part of the press-fit part 8 by internal pressure. Accordingly, the embrittlement portion formed near the bottom of the press-fit portion 8, on which this force acts, is ruptured, and the injection port 7 shown in Fig. 8C is opened. As described above, in particular, the vicinity of the bottom of the press-fitting part 8 is weakened by work hardening at the time of formation, and is suitable as a brittle part because a large force is easily applied when the holding sleeve 10 is broken. .

After the opening of the inlet 7, the internal pressure is released as necessary (after the pressurized water is discharged), and then the accessory 16 is mounted through the feed hose 17, or the accessory 16 is provided. Is removed and a curable injection material is supplied from the mouse sleeve (2). Examples of the curable injectable material include cement water suspension, bentonite-water glass suspension, water glass aqueous solution, chromenigrin aqueous solution, urea resin aqueous solution, acrylamide aqueous solution and acrylate. ) Aqueous solution, urethane resin liquid, etc. can be used, and it can select according to the property of soil, etc.

In the injection of the curable injection material, as described above, since the gap between the ground and the expansion injection bolt 1A is sealed, leakage of the curable injection material can be suppressed, and desired curable injection material injection is shown in FIG. 9. The area 19 can be surely obtained. In addition, since the expansion injection bolt 1A is left as a lock bolt even after completion of injection, even if there is spring water, it is possible to prevent the outflow of the curable injection material by the seal due to the expansion of the expansion portion 3, thereby ensuring a necessary area. We can plan ground improvement.

Although injection of a curable injection material can also be performed by inject | pouring a single type of curable injection material, you may inject a some kind of curable injection material by changing the kind of curable injection material on the way. As a combination example of plural kinds of curable injectors, the injectable curable injectable material is first injected to promote the injection into a wide range, and then the permeability is decreased but the curable injector having high strength after curing is injected to improve the ambient strength. However, in the place where there is a spring water, injecting a curable injection material with a short hardening time (gel time) first and restraining spring water, and inject | pouring a curable injection material with a long hardening time, etc., etc. are aimed at penetration. have.

In the above example, the injection port forming portion 9A is provided with the holding sleeve 10, but may be configured without the holding sleeve 10. That is, it can also be set as the above structure except not having the holding sleeve 10. FIG. However, in order to make it easy to adjust the forming pressure of the injection hole 7 (refer FIG. 8A and FIG. 8C), the holding sleeve 10 is formed, and when it becomes more than predetermined pressure, the holding sleeve 10 is broken and it is large in embrittlement part. It is preferable to set it as the structure which a force acts on.

10 is a view showing another embodiment of the injection hole forming step, in which reference numerals denote only relevant recesses.

In the present embodiment, the pressure feed hose 17 and the accessory 16 are removed from the mouse sleeve 2 of the expansion injection bolt 1A after the cutting process, insertion process, and expansion process described in FIGS. 5 to 7A and 7B. The mouse sleeve is removed by inserting the rod-like drilling tool 6 into the expansion injection bolt 1A from the mouse sleeve 2 and replacing it, and operating the drilling tool 6 instead. Attached to (2), the tip of the expansion injection bolt 1A is stuck with the drilling tool 6 to open the injection port 7. In this way, even if the pressure is increased, even when the injection hole 7 cannot be formed in the injection hole formation part 9A, the injection hole 7 can be formed reliably. In the case of the injection hole forming step, the injection hole forming portion 9A is not formed in advance, but after the expansion step, the subsequent injection step shown in FIG. 9 is formed by forcibly forming the injection hole 7 by the drilling tool 6. It can be carried out.

As the drilling tool 6, in addition to a simple rod-shaped body, a rod-shaped body with a sharp tip, a drill-shaped rod-shaped body, and the like can be used, and a hydraulic device or the like can be used as the operating device. In the case of using the drilling tool 6, it is preferable that the opening of the rear end is largely opened in the axial direction so that it is easy to insert into the expansion injection bolt 1A, but when the opening of the rear end is the small expansion injection bolt 1A, After the expansion process, the rear end may be cut to enlarge the opening and insert the drilling tool 6. When the screw part 5 is formed in the mouse sleeve 2 especially, the reaction force 20, such as a hydraulic jack, can be rotated and connected to remove reaction force, and the force pushed in the drilling tool 6 can be made to act correctly. .

It is sectional drawing which shows 2nd Embodiment of an injection hole formation part.

The injection hole formation part 9B of this embodiment blocks the injection hole 7 previously formed in the expansion part 3 with the stopper 21. As shown in FIG.

In the case of the said injection hole formation part 9B, this stopper 21 is comprised from the material which is less ductile than the material which comprises the expansion part 3, for example, and the stopper 21 and the expansion part 3 are made into, for example. When integrated by welding or the like, stress concentrates on the stopper 21 at the time of expansion of the inflation portion 3, and when the pressure is increased, the stress is broken and the inlet 7 can be opened. In addition, when the stopper 21 is peeled off by a predetermined internal pressure (screw type) or when pressurized water is used for supplying the internal pressure, the stopper 21 is integrated into the expansion part 3 with a water-soluble adhesive. It is also possible to weaken and rupture the adhesive force with the pressurized water supplied. The injection port formation part 9B by this stopper 21 can be easily formed not only in the front end part of the expansion part 3, but also in the vicinity of the rear end of the expansion part 3, or in the middle part.

It is sectional drawing which shows 3rd Embodiment of an injection hole formation part.

The injection hole formation part 9C of this embodiment forms the tubular lid | cover material holding part 22 which continues to the front-end | tip of the expansion part 3, and does not expand a diameter substantially by internal pressure, and a lid | cover material The tip opening of the holding part 22 is made into the inlet 7, and the inlet 7 is attached to the tip of the lid member holding part 22 by an annular cap 23. It is supposed to block at (24).

In the case of the injection hole forming portion 9C, the lid member 24 is made to have a strength to be broken by a predetermined internal pressure, and after the expansion of the inflation section 3, the internal pressure is increased to break the lid member 24 and the injection hole ( 7) can be opened. Moreover, since this lid | cover material 24 is easy to penetrate with the drilling tool 6 demonstrated in FIG. 10, this injection hole formation part 9C is suitable for the other example of the injection hole formation process especially demonstrated in FIG. .

It is sectional drawing which shows 4th Embodiment of an injection hole formation part.

The injection hole forming portion 9D of the present embodiment uses the same holding sleeve 10 as described with reference to FIGS. 1 to 4A and 4B, and is a position corresponding to the injection hole 7 formed in advance in the expansion portion 3. The holding sleeve 10 is caulked and the injection port 7 is closed by the holding sleeve 10. In addition, the holding sleeve 10 is provided with slits 12 at both ends.

In the case of the injection hole forming portion 9D, when the inflating portion 3 is inflated, the expansion of the portion caulking the holding sleeve 10 is suppressed, and the other inflating portion 3 is expanded without greatly inflating this portion. After the internal pressure is increased, the injection port 7 can be opened by breaking the holding sleeve 10 by increasing the internal pressure. In addition, a packing (not shown) for sealing the injection hole 7 between the holding sleeve 10 and the expansion part 3 in order to ensure the closed state of the injection hole 7 until the holding sleeve 10 is broken. You can also intervene. The injection hole formation part 9D of this embodiment can be easily formed not only in the front end part of the expansion part 3, but also in the vicinity of the rear end of the expansion part 3, or an intermediate part.

FIG. 14 is a perspective view in which an intermediate portion showing a second embodiment of the inflation bolt according to the present invention is omitted, and FIG. 15 is a description of a case where the internal pressure for opening the injection hole forming portion shown in FIG. 14 is locally applied using a packer. It is a figure and the code | symbol shows only a principal part.

In the expansion injection bolt 1B of the present embodiment, the tip is closed with the closing cap 25, and the stopper 21 is inserted into the injection hole 7 formed in advance in the middle of the expansion portion 3. The injection hole formation part 9B (refer FIG. 15) which was enclosed is formed in multiple numbers at moderate intervals in the axial direction. This injection hole formation part 9B is the same as what was demonstrated in FIG. 11 by opening the injection hole 7 by opening the stopper 21 by raising internal pressure after the expansion part 3 expands.

By the way, in the case of the expansion injection bolt 1B having the plurality of injection hole formation portions 9B as shown in FIG. 14, the injection ports 7 (see FIG. 15) of all the injection hole formation portions 9B simultaneously open due to internal pressure. The opening timing is shifted, respectively, and it may happen that all the injection holes 7 cannot be opened because the internal pressure escapes from the opened injection holes 7. In order to prevent the internal pressure from escaping when opening the inlet 7 and to selectively open only a part of the inlet 7, as shown in FIG. 15, the packer 26 is used locally. It is preferable to apply internal pressure.

To explain a little more, first, an internal pressure necessary to inflate the inflation section 3 is applied to inflate the inflation section 3 as shown in Fig. 7B. As a result, the press-in portion 8 is extended, and the inner space of the inflation portion 3 is enlarged to approximate a circle. In this state, the injection pipe 27 (double packer mounting injection pipe) with the packer 26 attached to it before and after shown in FIG. 15 is inserted into the expansion injection bolt 1B from the mouse sleeve 2 shown in FIG. .

The packer 26 is a bag that can be inflated by a pressurized fluid such as pressurized water, for example, and the fluid pressure is applied to the two packers 26 at a position where the injection hole forming portion 9B is fitted between the two packers 26. Is added to inflate, and the injection hole forming portion 9B is sandwiched between and sealed in the axial direction of the expansion injection bolt 1B. In this state, when a pressurized fluid is supplied from the injection pipe 27 to the area sandwiched between the two packers 26 and locally pressurized inside the expansion injection bolt 1B, an injection hole is formed at a position sandwiched by the two packers 26. The injection port 7 of the portion 9B can be reliably and selectively opened. And the injection pipe 27 with the packer 26 mounted can be easily moved to the axial direction of the expansion injection bolt 1B by releasing the pressure of the packer 26. As shown in FIG.

By opening the injection hole 7 selectively from the plurality of injection hole forming portions 9B as described above, not only the plurality of injection holes 7 can be reliably opened, but only some of the injection holes 7 are selectively opened. It is also possible to open or to inject another kind of curable injection material through the other injection port (7). For example, after injecting the curable injection material by opening only the inlet 7 near the tip portion, the curable injection material in the expansion injection bolt 1B is rinsed in the yet uncured vortex or punched out after curing, and then removed. Another type of curable injection material is injected in the axial direction of the expansion injection bolt 1B by opening the injection port 7 near the rear end, filling the filler on the tip side as necessary, and then injecting another type of curable injection material. can do. In addition, it is also possible to re-expand the inflated inflated portion 3 by local pressurization using the packer 26.

It is a perspective view which abbreviate | omitted the intermediate part which shows 3rd Embodiment of the expansion injection bolt which concerns on this invention, and a code | symbol shows only a recess.

The expansion injection bolt 1C according to the present embodiment has a cutting hole bit 28 at its tip.

When the above-mentioned cutting hole bit 28 is formed, the expansion hole bolt 1C can be inserted into the cutting hole 15 at the same time while forming the cutting hole 15 (see FIG. 5) using the cutting hole bit 28. Work time can be shortened.

Next, a fourth embodiment of the expansion injection bolt according to the present invention will be described.

FIG. 17 is a view showing a fourth embodiment of the expansion injection bolt according to the present invention, and FIGS. 18A and 18B are the rear end (supply side of the hardened injection material) and the front end (the deepest part side of the hole) of the expansion injection bolt shown in FIG. 19A to 19C are cross-sectional views of A-A ', B-B', and CC 'shown in FIGS. 18A and 18B.

As shown in FIG. 17, FIG. 18A, and FIG. 18B, the expansion injection bolt 1D of this embodiment is the cap 30 which blocks the front end of the expansion part 3, the cap sleeve 29, and the cap sleeve 29. As shown to FIG. Has an injection hole forming portion 9E.

In addition, the front end sleeve 31 and the rear end sleeve 32 are caulked at the front end and the rear end of the expansion part 3, respectively. The rear end portion of the cap sleeve 29 of the injection hole forming portion 9E is integrated in the front end sleeve 31 by the welding portion 33, and the rear end sleeve 32 is provided with the mouth sleeve 2 by the welding portion 34. It is integrated. The mouse sleeve 2 has a screw portion 5 formed therein, and is the same as the embodiment described with reference to FIGS. 1 to 4A and 4B. Reference numeral 35 denotes a convex portion for mounting the plate 36 (see FIG. 28A) when the expansion injection bolt 1D is fixed to the ground.

As can be seen from the cross-sectional view shown in FIG. 19B, the expanded portion 3 of the expanded injection bolt 1D according to the present embodiment pushes a part of the original tube inward along the axial direction, and a part of the push-in portion that is pushed into the original tube. It has the substantially C shape which has (8). Therefore, the expansion part 3 pushes out the indentation part 8 outward by applying internal pressure to an internal space, and is expandable in a radial direction.

As shown in FIG. 19A, in order to prevent the internal pressure from leaking to the outside and suppress the expansion of the diameter, the rear end portion of the inflation portion 3 applies an internal pressure to the expansion injection bolt 1D. The outer space between the press-fit portion 8 and the rear end sleeve 32 is filled up. In addition, as shown in FIG. 19C, in order to suppress the diameter expansion, the front end of the expansion part 3 is filled with the external space between the press-fit part 8 and the front end sleeve 31 by the welding part 38.

The constituent material of the expansion part 3 of the expansion injection bolt 1D of this embodiment is the same as that of the expansion injection bolt 1A demonstrated in FIGS. 1-4A and 4B.

The injection port forming portion 9E composed of the cap sleeve 29 and the cap 30, which is attached to the distal end portion of the expansion injection bolt 1D of the present embodiment, is an integral molded body, and is formed between the cap sleeve 29 and the cap 30. Is formed thin, the thickness of the thin portion is broken by the internal pressure, the cap 30 is separated from the sleeve for the cap 29 to open the inlet 7 at the distal end of the expansion injection bolt 1D. It is supposed to be.

As the cap sleeve 29 and the cap 30, the same material as that of the inflation portion 3 can be used, and the cap sleeve 29 is formed by a predetermined internal pressure, specifically, higher internal pressure than when the inflation portion 3 is inflated. ), The cap 30 may be configured to be separated. In addition, the connection form with the expansion part 3 is also not limited to welding.

20-22, sectional drawing of another structural example of the inlet_port | hole formation part which consists of a cap sleeve and a cap which can be used by this invention is shown.

The injection hole formation part 9E of FIG. 20 is screwed together with the cap 30 made of synthetic resin which provided the screw bone in the outer side in the metal sleeve rib 29 which provided the screw bone in the inside. The injection hole formation part 9E of FIG. 21 is screwed so that the cap 30 made from the synthetic resin which formed the screw bone in the outer side may be screwed together so that it may be embed | buried in the cap sleeve 29, and it may be carried out by the conveyance, the collision during operation, etc. The cap 30 is easily prevented from being damaged. The injection hole formation part 9E of FIG. 20 and FIG. 21 is a form in which the cap 30 is isolate | separated from the cap sleeve 29 using the flexibility and elasticity of the synthetic resin which comprises the cap 30 all. 22 shows the thickness of the front-end | tip part of the synthetic resin cap 29 which formed the screw bone on the outer side thinly, arrange | positions the ball 39 inside, and the ball 39 protrudes outward by internal pressure. The inlet 7 is opened. Examples of the synthetic resin constituting the cap 30 as shown in FIGS. 20 to 22 include polyvinyl chloride, ABS (acrylonitrile butadiene styrene) resin, PET (polyethylene terephthalate), and poly Carbonate and the like can be used.

The expansion injection bolt 1D using the injection hole formation part 9E which consists of the cap sleeve 29 and the cap 30 is one of the characteristics that it is easy to improve so that it may connect and extend two or three or more. This will be described with reference to FIGS. 23 to 25A and 25B.

Fig. 23 is a sectional view of the distal end of the expansion injection bolt, which is the rear end side after the connection extension, and Fig. 24 is a sectional view of the rear end of the expansion injection bolt, which is the front end side after the connection extension, Figs. 25A and 25B 25A is a sectional view of a connection of two expansion injection bolts, and FIG. 25B is an external view of a connection of two expansion injection bolts.

As shown in FIG. 23, in the front end sleeve 31 of the expansion injection bolt 1D of FIG. 17, the extension front end sleeve 40 which formed the screw bone instead of the cap sleeve 29 and the cap 30 was welded ( 33), it is set as the rear-end expansion injection bolt part 1D 'which becomes a rear-end side after connection extension. On the other hand, as shown in FIG. 24, instead of the mouse sleeve 2, the screw bone corresponding to the screw bone of the said extended front sleeve 40 was formed in the rear sleeve 32 of another expansion injection bolt 1D. An extension rear end sleeve 41 is mounted by the weld part 34, and it is set as the front end side expansion injection bolt part 1D "which becomes a front end side after connection extension.

As shown in FIG. 25A, by screwing together the extension front end sleeve 40 and the extension rear end sleeve 41, the rear end expansion injection bolt portion 1D 'and the front end expansion injection bolt portion 1D " The internal spaces are connected in a continuous state by the flow paths 42 and 43 to form a series of expansion injection bolts (not shown).

The expansion injection bolt 1D using the injection hole forming portion 9E composed of the cap sleeve 29 and the cap 30 is not only extended by two connections but also improved to connect and extend three or more. It is easy.

That is, instead of the cap sleeve 29 and the cap 30, an extension front sleeve 40 is attached to the front end of the expansion injection bolt 1D of FIG. 17, and the mouse is attached to the rear end of the same expansion injection bolt 1D. An extension rear end sleeve 41 mounted in place of the sleeve 2 was prepared as the intermediate expansion injection bolt portion of the extension intermediate portion, and at least one of the intermediate expansion injection bolt portions, the rear end expansion shown in Figs. 23 and 24. By arranging between the injection bolt portion 1D 'and the tip-side expansion injection bolt portion 1D ", it can be extended by a desired number. In the present invention, the extension member is an extension tip sleeve 40 and an extension. It is only necessary to separately prepare two types of the rear end sleeve 41 for the extension, and the extension work only needs to screw the extension front sleeve 40 for extension and the rear end sleeve 41 for extension. I can do the work, Chapter can be transported to the previous length.

Next, the injection method of this invention using the expansion injection bolt 1D demonstrated in FIG. 17 is demonstrated using FIG. 26A and FIG. 26B-FIG.

Fig. 26A and Fig. 26B are cross-sectional views showing an example of the configuration of an accessory device mounted and used in the expansion injection bolt, Fig. 27 is a view showing a step of forming a hole, and Figs. 28A and 28B are steps of inserting an expansion injection bolt into the hole. 28A is a view showing the expansion injection bolt inserted into the hole, Figure 28B is a cross-sectional view AA 'in Figure 28A, Figures 29A and 29B shows the expansion process of the expansion injection bolt, Figure 29A FIG. 29B is a sectional view taken along line AA ′ of FIG. 29A, and FIG. 30 is a view illustrating an injection hole forming process, showing a state in which the cap is removed by applying a higher internal pressure.

First, as shown in FIG. 27, the cutting hole 15 is formed in the ground. In the formation of the cutting hole 15, a drilling auger or the like of a drill jumbo generally used may be used.

After formation of the cut hole 15, as shown to FIG. 28A, the expansion injection bolt 1D which pinched the plate 36 to the convex part 35 position in the said cut hole 15 is a front end side (cap 30 side). Insert it into the ground. In this state, as shown in FIG. 28A and FIG. 28B, the expansion part 3 of the expansion injection bolt 1D is not inflated, and there is a space between the expansion part 3 and the inner wall of the ablation hole 15. It is inserted in the cutting hole 15 in a state.

Next, as shown in FIG. 29A, the accessory 16 is attached to the mouse sleeve 2, and a pressure feed hose (not shown) is connected to the accessory 16 to apply internal pressure in the expansion injection bolt 1D. . This internal pressure is applied as the fluid pressure. For example, although it can also carry out by pressurized gas, such as compressed air, pressurized liquid which is easy to apply a big pressure, especially pressurized water is preferable.

As shown in FIG. 26A, the accessory 16 has a screw portion 44, which is screwed into the mouse sleeve 2 of FIG. 17 to the expansion injection bolt 1D. I can attach it. The accessory 16 is provided with a supply hole 18 for supplying pressure into the expansion injection bolt 1D, and can connect a pressure feed hose (not shown) in a state of communicating with the supply hole 18. It is. The accessory device 16 may be mounted before the expansion injection bolt 1D is inserted into the cutting hole 15, or may be mounted after the insertion. In addition, as shown to FIG. 26B, the accessory 16 'which does not have the screw part 44 can be directly welded to the rear end sleeve 32, without using the mouse sleeve 2. As shown in FIG.

As shown in Fig. 29B, the expansion injection bolt 1D expands in the radial direction due to the internal pressure and adheres to the inner wall of the cutting hole 15, so that the spring water from the cutting hole 15 Even if there is, it is possible to index this. In addition, due to the expansion of the expanded portion 3, even when the surrounding ground is fragile, a certain amount of fixing force of the expansion injection bolt 1D is obtained.

It is preferable that the expansion part 3 be inflated at a pressure lower than the pressure at which the cap 30 is separated from the sleeve 29 for the cap. If the cap 30 is separated from the cap sleeve 29 before the expansion portion 3 is sufficiently inflated, an internal pressure leak occurs from the opening, and the expansion operation is necessary because the internal pressure above this leak must be supplied (pressurized water is supplied). It becomes difficult to carry out.

By inflating the inflated portion 3 of the inflation injecting bolt 1D after the required amount and supplying a higher pressure, as shown in FIG. 30, the cap 30 is separated from the cap sleeve 29 and the inflation injecting bolt 1D The injection port 7 is opened at the tip of the head.

Thereafter, if necessary, the internal pressure is released (after draining the pressurized water), and then the accessory 16 is mounted through the feeding hose (not shown), or the accessory 16 is removed and the mouse sleeve is removed. The curable injection material is supplied from (2). This curable injection material is the same as what was demonstrated in the example of the injection method using the expansion injection bolt which concerns on 1st Embodiment.

In the injection of the curable injection material, as described above, since the gap between the ground and the expansion injection bolt 1D is sealed, leakage of the curable injection material to the outside can be suppressed and the deepest portion of the cutting hole 15 ( Curable injection can be injected towards the outermost side. In addition, since the expansion injection bolt 1D remains as a lock bolt even after the completion of injection, even if there is spring water, it is possible to prevent the outflow of the curable injection material by the seal due to the expansion of the expansion portion 3, thereby ensuring a necessary area. We can plan ground improvement.

Also in this embodiment, although inject | pouring of a curable injection material may be performed by inject | pouring a single type of curable injection material, you may change the kind of curable injection material on the way, and can also inject a some type of curable injection material. The combination example of a some kind of curable injection material is also the same as that demonstrated in the example of the injection method using the expansion injection bolt which concerns on 1st Embodiment.

Fig. 31 is a sectional view of the vicinity of a face in a tunnel construction using the injection method of the present invention, Fig. 32 is a front view of the face, reference numeral 101 is an expansion injection bolt of the present invention, 102 is a curable injection material injection region, and 103 Is the face side.

As shown, the injection method using the expansion injection bolt 101 of the present invention, the ground stabilization of the face surface 103 in the tunnel construction, reinforcement of the ceiling near the face surface 103 and the tunnel inner wall It can be used to reinforce the leg of arched concrete. In tunnel construction, the expansion injection bolt 101 is inserted into the ground surface immediately after the excavation and a curable injection material is injected to stabilize the excavated tunnel and stabilize the ground to be excavated from now on.

By the way, the ground surface, which has been excavated and exposed, is likely to recede. Accordingly, looseness occurs near the mouth of the mouth of the hole into which the expansion injection bolt 101 is inserted at the time of injection of the curable injection material, and leakage of the curable injection material is likely to occur.

However, according to the present invention, as described above, it is possible to seal this by bringing it into close contact with the inner surface of the hole by expanding the expanded portion. Moreover, since the spring water can also be sealed at the same time, the work in the tunnel construction performed while repeating excavation and ground reinforcement can be greatly improved.

Claims (24)

An expansion injection bolt having a tubular shape capable of applying internal pressure from a rear end thereof, an expansion part that expands in the radial direction by applying internal pressure, and an injection hole forming part that opens the injection port by applying internal pressure. The expansion injection bolt according to claim 1, wherein the expansion portion has a structure in which a portion of the plastic pipe capable of plastic deformation is pushed inward along the axial direction to form a press-fit portion. The welded portion according to claim 2, wherein the distal end portion is an inflation portion, and the injection hole forming portion allows the distal end of the inflation portion to be opened from side to side from the indentation portion of the indentation portion, and a weld portion for blocking the enlargement of diameter; An expansion injection bolt formed in the press-fitting portion near the welded portion and having an embrittlement portion that is ruptured by the internal pressure to open the injection port. 4. The inlet forming portion has a holding sleeve for caulking at the outer periphery of the inflation portion at a position corresponding to the embrittlement portion, and broken by internal pressure to rupture the embrittlement portion to open the inlet opening. Expansion injection bolt made. The inflation injection bolt according to claim 2, wherein the injection hole forming portion has an injection hole previously formed in the expansion portion, and a stopper for closing the injection hole and opening the injection hole by internal pressure. The inflation injection bolt according to claim 2, wherein the injection hole forming portion has an injection hole formed in advance in the expansion portion, and a holding sleeve that is in close contact with the injection hole and is caulked on the outer periphery of the expansion portion, and is broken by internal pressure to open the injection hole. . The expansion injection bolt according to claim 1, wherein a seal material is wound around the outer circumferential surface of the inflation portion. The expansion injection bolt according to claim 1, wherein the rear end portion is a mouth sleeve that opens in the axial direction. The expansion injection bolt according to claim 1, wherein the expansion injection bolt has a cutting hole bit at its tip. 3. The cap according to claim 2, wherein the inlet forming portion has a cap sleeve whose rear end is attached to the tip of the expansion portion, and a cap separated from the cap sleeve by closing the tip of the cap sleeve and applying an internal pressure. An expansion injection bolt, characterized in that it has a. 11. The expansion injection bolt according to claim 10, having a tip sleeve attached to the tip end of the inflation section, and a rear end of the cap sleeve is attached to the tip sleeve. 11. The cap sleeve and the cap are integrally molded, and the thickness of the connecting portion is formed thinner than other portions, and the connecting portion is broken by applying internal pressure, so that the cap is separated from the cap sleeve. Expansion injection bolt. The expansion injection bolt according to claim 10, wherein the cap is made of synthetic resin and is mounted to be embedded in the cap sleeve. 12. The expansion injection bolt according to claim 11, wherein a mouth sleeve having a rear end sleeve mounted to the rear end of the inflation portion is attached to the rear end sleeve, the rear end of which is opened in the axial direction. 3. The inflation-side expansion injection bolt portion according to claim 2, which is divided into a rear-end expansion injection bolt portion having an extension front end sleeve mounted at the front end of the inflation portion, and a front-side expansion injection bolt portion having an extension rear end sleeve mounted at the rear end of the expansion portion. An expansion injection bolt, wherein an inner space is continuously connected through an extension front end sleeve and an extension rear end sleeve. 16. The apparatus according to claim 15, wherein one or more intermediate expansion injection bolts each having an extension front end sleeve and an extension rear end sleeve are connected between the rear end expansion injection bolt part and the front end expansion injection bolt part, respectively. Expansion injection bolt, characterized in that. The inflation injection bolt according to any one of claims 1 to 16, wherein the inlet forming portion opens the inlet at a pressure higher than the minimum pressure necessary to inflate the inflating portion. The inflation injecting bolt is formed by using an inflation injecting bolt having a tubular shape capable of applying internal pressure from the rear end and having an inflation portion that expands in the radial direction by applying an internal pressure and an inlet forming portion for opening the inlet by applying an internal pressure. Inserting into the ground, applying an internal pressure to the expansion injection bolt to expand the inflation section and opening the injection port, and then supplying a curable injection material to the expansion injection bolt, and injecting the curable injection material around the opening through the injection hole. Method. 19. The inlet forming portion of the inflation injecting bolt has a sleeve that is caulked around the inflation portion and is broken by internal pressure to open the inlet, and after inflating the inflation portion, the inlet is broken by applying a higher internal pressure. Injecting method, characterized in that for opening the inlet. 19. The inlet forming portion of the inflation injecting bolt according to claim 18, wherein the inlet forming portion of the inflation injecting bolt has a cap sleeve whose rear end is attached to the distal end of the inflation portion, and a cap separated from the cap sleeve by closing the tip of the cap sleeve and applying an internal pressure, And inflating the inflation section and then applying a higher internal pressure to separate the cap from the cap sleeve to open the inlet. The inflation injecting bolt is formed by using an inflation injecting bolt having a tubular shape capable of applying internal pressure through a mouth sleeve opening in the axial direction and formed in the rear end and having an inflation portion which expands in the radial direction by applying an internal pressure. Insert the ground, apply internal pressure to the expansion injection bolt to expand the expansion portion, insert a drilling tool from the mouth sleeve of the expansion injection bolt to form an injection hole in the expansion injection bolt, and supply the curable injection material to the expansion injection bolt, Injection method, characterized in that to inject a curable injection material around. 19. The injection method according to claim 18, wherein an expansion injection bolt having a cutting hole bit at its tip is used to insert the expansion injection bolt into the cutting hole while simultaneously drilling a hole. A cap having a tubular shape capable of applying internal pressure from the rear end, a main body expanding in the radial direction by applying internal pressure, and a cap having a sleeve from which the cap and the sleeve are separated by applying an internal pressure; Using the inflation injection bolt attached to the front end of the main body, the inflation injection bolt is inserted into a ground hole formed in the ground, and the main body is expanded by applying internal pressure to the inflation injection bolt, and then the higher end pressure is applied. The capping method is characterized in that the cap is removed, and the curable injection material is supplied into the expansion injection bolt and the curable injection material is injected from the distal end into the hole. The injection method according to any one of claims 18 to 23, wherein the type of the curable injection material supplied to the expansion injection bolt is changed on the way.

Images