JP3020087U - Lock bolt fixing material leakage prevention tool - Google Patents

Abstract

(57) [Abstract] [Purpose] Lock bolt fixing material leakage prevention device that prevents the fixing material 2 from leaking when the fixing material 2 such as mortar is injected into the drilled portion 1 and the lock bolt is inserted. I will provide a. A jig for preventing the fixing material 2 injected into the perforated portion 1 from leaking by being attached to the perforated portion 1 formed in the inner wall of the tunnel, and is formed into a conical shape with a flexible material. At the same time, the diameter of the bottom part is set to be slightly larger than that of the perforated part 1, while a plurality of cut parts are formed from the top part to the midway part toward the bottom part, and the lock bolt insertion hole that does not penetrate from the center of the bottom part to the cut part direction. 4 was formed.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a fixing material leakage preventive tool used when a lock bolt is attached to an inner wall of a tunnel during tunnel construction.

[0002]

[Prior art]

 For tunnel excavation work, it is necessary to give a certain support capacity to the excavated tunnel for safety. There are various reinforcing methods, but in recent years, the NATM method has been used as a method capable of efficiently reinforcing. As shown in FIG. 7, a perforated portion 1 is formed on the inner wall 10 of the tunnel with a drill (not shown), and a fixing material 2 (mortar) is injected into the perforated portion 1 by a mortar feeder 11. In addition, at the time of injection, the hose 9 connected to the mortar feeder 11 is used and the hose 9 is inserted into the drilled portion 1.

After the injection of the mortar, the mortar easily leaks from the drilled portion 1, so the lock bolt 6 is inserted into the drilled portion 1 as soon as possible. Here, since the mortar has a certain degree of viscosity, it will not leak out immediately, but it is unavoidable that a cavity 8 or air bubbles form in the inner part (upper part). When the lock bolt 6 is inserted in this state (FIG. 8), the pressure causes the mortar to flow out, and eventually the lock bolt 6 is fixed in a state where a cavity is formed around the lock bolt 6.

There is a step of spraying concrete on the inner wall of the tunnel before the above work, and a step of spraying mortar on the inner wall of the tunnel after the above work, if necessary.

[0005]

[Problems to be solved by the device]

 However, if a cavity is formed around the rock bolt, it becomes impossible to secure the fixing force with the ground and the corrosion resistance on the surface of the rock bolt is reduced. Therefore, the tunnel strength is reduced.

[0006] Further, it is not preferable that the leakage of mortar not only pollutes the surroundings of the site but also causes a risk of getting into the eyes of the operator. The present invention has been made in view of the above-mentioned matters.A lock bolt fixing material leak that prevents the fixing material from leaking out when pouring a fixing material such as mortar into the hole and inserting the lock bolt It is a technical issue to provide a preventive tool.

[0007]

[Means for Solving the Problems]

 The present invention has the following configuration in order to solve the above technical problems. That is, the jig is a jig for preventing leakage of the fixing material 2 injected into the perforated portion 1 by mounting it on the perforated portion 1 formed in the inner wall of the tunnel, and is formed into a conical shape by a flexible material. In addition, the diameter of the bottom portion is set to be slightly larger than that of the perforated portion 1, while a plurality of cut portions 3 are formed from the top portion to a midway portion toward the bottom portion, and do not penetrate from the center of the bottom portion to the cut portion 3 direction. The technical means is to form the lock bolt insertion hole 4. [Drilling portion 1] This is a hole portion where the lock bolt fixing material leakage prevention tool is mounted, and is drilled on the inner wall of the tunnel by a drill or the like. [Fixing material 2] A concept that includes mortar, concrete, and other hardening accelerators, and is injected into the perforated portion 1 by a pressure pump. [Flexible Material] Deformable rubber, synthetic resin, or the like, and it is preferable to form the whole with such a flexible material. [Cut portion 3] The cut portion 3 is formed by radially forming 4 to 8 pieces from the top of the lock bolt fixing material leakage prevention tool, and does not necessarily have to be completely cut, and may be a broken line broken portion or a broken portion. It may be a possible thin film. The part partitioned by these cutting parts 3 has a triangular shape with the bottom part connected to the main body, and expands by the force from the lock bolt insertion hole 4 side. As a result, the lock bolt insertion holes 4 communicate with each other in the vertical direction. On the other hand, the triangular portion does not move by the force from the top side, and the lock bolt insertion hole 4 is closed.

The lock bolt fixing material leakage preventive tool is made of a flexible material such as natural or synthetic rubber, flexible synthetic resin, or foamed resin. Further, the diameter of the bottom portion is preferably set to be larger than the diameter of the perforated portion 1 by about 5% to 30%. [Lock bolt insertion hole 4] The lock bolt fixing member is formed so as not to always penetrate from the center of the bottom of the fixing material leakage prevention tool in the direction of the cut portion. That is, only when the rod-shaped lock bolt is inserted from the bottom center side of the lock bolt fixing material leakage prevention tool, the cut portion 3 is cracked and the lock bolt is exposed from the top.

[0009]

[Action]

 After injecting the fixing material 2 into the perforated portion 1, a lock bolt fixing material leakage prevention tool is attached to the entrance of the perforated portion 1. This prevents the fixing material 2 from leaking to the outside. Here, when the lock bolt is strongly inserted through the lock bolt insertion hole 4, the cut portion 3 breaks and penetrates to the top of the lock bolt fixing material leakage preventive tool. As a result, the lock bolt is mounted at an appropriate position in the hole 1. After this, tighten the washer and nut on the lock bolt to fix the lock bolt. Since the peripheral side wall is tapered, if it is inserted into the hole portion 1 from the small-diameter top portion, the hole can be deformed to accommodate any diameter.

[0010]

【Example】

 An embodiment of the present invention will be described with reference to FIGS. As shown in FIG. 1, the lock bolt fixing material leakage preventive tool 5 described in this embodiment, after the fixing material 2 is injected into the perforated portion 1 formed in the tunnel inner wall 10, the lock bolt 6 is inserted into the perforated portion 1. It is used in the process of inserting and tightening. The inner wall 10 of the tunnel is sprayed with mortar 10a, which is the primary lining, and the drilling operation is performed thereafter.

As shown in FIGS. 2 and 3, the lock bolt fixing material leakage preventive tool 5 is made of rubber and is formed into a generally conical shape. The diameter of the bottom is larger than that of the perforated portion 1 by about 20%. Six cutting portions 3 are formed on the top portion (tip portion) of the lock bolt fixing material leakage prevention tool 5 with an angle difference of 60 degrees. The cutting portion 3 is formed to a length of about 1/3 of the height of the cone. As a result, the non-cut inclined portion 5a is formed.

By forming the cutting portions 3, six valve portions 3a are formed between the cutting portions 3 and can be expanded only in the F direction shown by the arrow. Further, a lock bolt insertion hole 4 that does not penetrate from the center of the bottom of the lock bolt fixing material leakage prevention tool 5 toward the cutting portion 3 is formed. The lock bolt insertion hole 4 is stopped midway without penetrating the island portion 3a, but is in communication with the cutting portion 3, and when the valve portion 3a is expanded as shown in FIG. It is designed to penetrate completely.

A tunnel reinforcing process using the lock bolt fixing material leakage preventive tool 5 having the above-described structure will be described with reference to FIGS. 1 and 4 to 6. First, the mortar 10a is sprayed on the inner wall of the tunnel, and the primary lining is applied. Then, the perforated portion 1 is formed with a drill (not shown). Then, after the fixing material 2 is injected into the perforated portion 1 by the mortar feeder 11 and the hose 9 connected thereto (FIG. 4), the lock bolt fixing material leakage prevention device 5 is attached to the entrance of the perforated portion 1 ( Figure 5). This prevents the fixing material 2 from leaking to the outside. This is because the valve portion 3a functions as a valve that can be opened only in the direction of the arrow F, and therefore the cutting portion 3 is in a close contact state. Therefore, even if the fixing material 2 falls, it does not leak to the outside.

Then, as shown in FIG. 1, when the lock bolt 6 is strongly inserted through the lock bolt insertion hole 4, the cut portion 3 is cracked and penetrates to the top of the lock bolt fixing material leakage preventive tool 5. As a result, the lock bolt 6 is mounted at an appropriate position inside the punched portion 1. At this time, the fixing material 2 may leak a little with the insertion of the lock bolt 6, but since the inside is hermetically closed, no cavity is formed in the perforated portion 1.

Subsequently, as shown in FIG. 6, the large washer 7 and the small washer 8 are inserted into the lock bolt 6, and the nut 12 is tightened to fix the lock bolt 6. In this way, the fixing material 2 is filled all around the lock bolt 6.

[0016]

[Effect of device]

 According to the present invention, when the fixing material such as mortar is injected into the drilled portion and the lock bolt is inserted, after the fixing material is injected, the lock bolt fixing material leakage preventive tool is mounted in the drilled portion to fix the fixing material. It is possible to prevent the material from leaking.

Further, since the lock bolt fixing material leakage prevention tool has the lock bolt insertion hole through which the lock bolt penetrates and the cut portion which acts as a valve, the lock bolt can be easily inserted into the drilled portion. .

As described above, since it is possible to prevent the fixing material from leaking, it is possible to secure the fixing force of the lock bolt to the inner wall of the tunnel. Furthermore, since no cavity can be formed around the lock bolt, the resistance to corrosion is further improved.

Further, it is possible to reduce the contamination of the work site with the fixing material, prevent the fixing material from being applied to the worker, and improve the working environment.

[Brief description of drawings]

FIG. 1 is a sectional view of an essential part showing an embodiment of the present invention.

FIG. 2 is a side view of a lock bolt fixing material leakage prevention device main body portion showing an embodiment of the present invention.

FIG. 3 is a bottom view of a lock bolt fixing material leakage prevention device main body according to an embodiment of the present invention.

FIG. 4 is a sectional view showing an initial state of a construction process showing an embodiment of the present invention.

FIG. 5 is a cross-sectional view showing an intermediate state of a construction process showing an embodiment of the present invention.

FIG. 6 is a cross-sectional view showing a late state of a construction process showing an embodiment of the present invention.

FIG. 7 is a cross-sectional view showing a conventional method of mounting a lock bolt.

FIG. 8 is a cross-sectional view showing a conventional lock bolt mounting method.

[Explanation of symbols]

 1 ・ ・ Drilling part, 2 ・ ・ Fixing material, 3 ・ ・ Cutting part, 4 ・ ・ Rock bolt insertion hole, 5 ・ ・ Lock bolt fixing material leakage prevention tool, 6 ・ ・ Lock bolt, 10 ・ ・ Inner wall of tunnel .

Claims (1)

[Scope of utility model registration request] 1. A jig for preventing leakage of a fixing material injected into a perforated portion by being mounted on a perforated portion formed in an inner wall of a tunnel, which is formed in a conical shape by a flexible material. While setting the diameter of the bottom part slightly larger than that of the perforated part, a plurality of cut parts are formed from the top part to the middle part to the bottom part, and a lock bolt insertion hole that does not penetrate from the center of the bottom part to the cut part is formed. A lock bolt fixing material leakage prevention device characterized in that