JPS6257800B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to lock bolts.

When the applicant first fixes a lock bolt inside a hole drilled in the ground on the inner periphery of a tunnel, the applicant inserts the lock bolt into the hole, fixes the lock bolt to the ground, and closes the entrance of the hole. proposed a method of directly filling the inside of the hole with a filler such as mortar or cement paste.

However, with this method, if there is a crack in the ground that opens on the inner wall surface of the hole, there is a problem that the filler flows out through the crack and is not filled into the hole. Further, when spring water flows into the hole, there is a problem that the filling material is pushed out from the entrance of the hole by the spring water or the filling material is diluted by the spring water.

In view of the above-mentioned points, the present invention provides a lock bolt that can be securely fixed inside the hole even if there is a crack in the ground opening on the inner wall surface of the hole or when spring water flows into the inside of the hole. An example of this will be described below with reference to the drawings.

In Fig. 1, reference numeral 1 denotes a shaft made of a steel rod or the like inserted into a hole 3 made diagonally upward in the ground 2 on the inner circumference of the tunnel. A bottomed cylindrical body made of synthetic resin or the like is covered from its opening side, and the bottomed cylindrical body is fitted over almost the entire length of the shaft 1 except for a predetermined length on one end side of the shaft 1. are doing. This bottomed cylindrical body is fixed to the shaft body 1 with adhesive or adhesive tape at a position near the opening thereof and at a position separated by a predetermined length from the position near the opening, thereby forming the bag body 4. As a result, a first closed space 5 is formed around one end of the shaft 1, and a portion other than the portion of the shaft 1 located within the first closed space 5 is formed. A second closed space 6 is formed around the entire end side. These first and second closed spaces 5 and 6 are filled with a filler 7 such as mortar or cement paste, and the bag body 4 covers the hole 3 except for the portion fixed to the outer peripheral surface of the shaft body 1. Closely attached to the inner wall surface. On the outer peripheral surface of the shaft 1, there is a first tube 8 extending from one end of the shaft 1 to the other end and opening inside the first closed space 5, and a first tube 8 having one end inside the first closed space 5. It is open and the other end is the second closed space 6
a second tube 9 that opens near one end of the inner shaft 1; and a third tube 10 that extends from one end of the shaft 1 to near the other end of the shaft 1 and opens in the second closed space 6. and are fixed along the axial direction with adhesive or a band. These tubes 8,
9 and 10 are made of synthetic resin tubes, etc., and the bag body 4 covers these tubes 8, 9, and 10.

When fixing the lock bolt having the above structure into the hole 3 that is diagonally upwardly drilled in the ground 2, first insert the lock bolt into the hole 3 from the other end of the shaft 1, and insert the lock bolt into the hole 3 from the other end of the shaft 1 to the end of the bag 4 on the one end side of the shaft 1. Insert until it reaches the opening of hole 3. At this time, since the first and second closed spaces 5 and 6 are not filled with the filler 7,
The lock bolt can be easily inserted into the hole 3.
Next, in this state, when the filler 7 is injected from one end side of the shaft body 1 of the first tube 8, the filler 7 is filled into the first closed space 5 through the opening of the first tube 8, and this filling The portion of the bag 4 forming the first closed space 5 is pressed against the inner wall surface of the hole 3 by the material 7 . At this time, since the filler 7 is a fluid,
Even if the inner wall surface near the entrance of the hole 3 is uneven, the portion of the bag 4 forming the first closed space 5 is reliably pressed against the inner wall surface of the hole 3. Thus, after filling the first closed space 5 with the filler 7, the lock bolt is fixed inside the hole 3. Thereafter, when the filler 7 is further injected from one end of the shaft body 1 of the first tube 8, the filler 7 passes through the second tube 9 and is filled into the second closed space 6. Filled filler 7
The air in the second closed space 6, which is pushed toward the other end of the shaft body 1, is evacuated to the outside of the hole 3 through the third tube 10. In this case, when the bag body 4 is made of breathable cloth, the air between the bag body 4 and the inner circumferential wall of the hole 3 passes through the bag body 4 and enters the bag body 4, and the third tube 10 The air is evacuated to the outside of the hole 3 through. When the bag body 4 is made of a non-breathable synthetic resin membrane, a small hole is made in the bag body 4 to serve as a ventilation hole,
Alternatively, a small hole communicating with the hole 3 may be formed in the tube 10 at a position between the first and second closed spaces 5 and 6 to serve as a ventilation hole. The small hole in the bag body 4 is preferably provided near the opening of the third tube 10. When the second closed space 6 is completely filled with the filling material 7, the filling material 7
flows out of the hole 3 through the third tube 10, confirming completion of filling. Since the filler 7 is a fluid, even if the inner wall surface of the hole 3 is uneven, the portion of the bag 4 forming the second closed space 6 is reliably pressed against the inner wall surface of the hole 3. In addition, filler 7
is filled inside the bag body 4, so even if there is a ground crack (not shown) opening on the inner wall surface of the hole 3, there is no fear that the filling material 7 will flow out through the ground crack, and there is no possibility that the filling material 7 will flow out through the ground crack. Even if spring water flows into the hole 3, there is no fear that the filling material 7 will be pushed out from the entrance of the hole 3 or that the filling material will be diluted by the spring water. Thereafter, the filler 7 filled in the first and second closed spaces 5 and 6 solidifies, thereby fixing the lock bolt inside the hole 3.

In this way, since the inside of the bag body 4 is filled with the filler material 7, even if there is a crack in the ground opening on the inner wall surface of the hole 3, or even if spring water flows into the inside of the hole 3,
There is no fear that the filling material 7 will flow out of the hole 3 or that the filling material will be diluted by spring water, and therefore the lock bolt is securely fixed inside the hole 3. In addition, since the lock bolt is fixed inside the hole 3 by filling the first closed space 5 with the filler 7, a cylindrical elastic body is fitted around the shaft body 1 as in the conventional case, and this elastic body is inserted into the hole. Compared to a method in which the lock bolt is fixed by forcefully inserting it into the hole 3, the structure is simpler and can be produced at a lower cost, and the lock bolt can be easily inserted into the hole 3.

Note that even if the hole 3 is drilled vertically upward in the ground 2, the lock bolt can be fixed inside the hole 3 using the same procedure as described above.

Also, the first tube 8 and the second tube 9
Instead of providing the shaft body 1 as shown in FIG.
A tube 11 that extends from one end to the other end and opens near one end of the shaft 1 in the second closed space 6 is fixed to the outer peripheral surface of the shaft 1 along the axial direction. The notch 12 may be formed in a portion located within the first closed space 5.

FIG. 3 shows another embodiment, in which the hole 3 is drilled diagonally downward in the ground 2, vertically downward or horizontally, from one end of the shaft 1. A first tube 13 extending toward the other end and opening in the first closed space 5; and a shaft body 1 having one end opening in the first closed space 5 and the other end opening in the second closed space 6. A second tube 14 that opens near the other end, and a third tube 15 that extends from one end of the shaft 1 toward the other end and opens near the end of the shaft 1 in the second closed space 6. Shaft body 1
A lock bolt is used that is fixed along the axial direction on the outer peripheral surface of the The other end of the second tube 14 is the shaft body 1
The second tube 14 may be shortened and opened at any location within the second closed space 6, even if not near the other end. The fixing work of the lock bolt is exactly the same as in the first embodiment, and
Filling material 7 is filled through the second tubes 13 and 14, and the bag body 4 is filled through the third tube 15.
Evacuate the air inside. The air between the bag body 4 and the inner wall surface of the hole 3 passes through the bag body 4 or into the tube 15 between the first and second closed spaces 5 and 6 as in the first embodiment. The gas is degassed through a small hole drilled in the air. In this case as well, the same effects as in the first embodiment can be obtained.

In the above embodiment, an example was described in which the first closed space 5 and the second closed space 6 were formed by one bag body 4, but the first closed space 5 and the second closed space 6 and may be formed by separate bags.

As explained above, according to the lock bolt according to the present invention, since the first and second closed spaces are filled with the filler, even if there is a crack in the ground that opens on the inner wall surface of the hole, Even if spring water flows into the inside of the hole, there is no fear that the filling material will flow out of the hole or be diluted by the spring water, and therefore it can be reliably fixed inside the hole. Also the first
Since it is fixed inside the hole by filling the closed space of the hole with a filler, the structure is simple and can be manufactured at low cost compared to conventional ones using elastic bodies.
It can be inserted into the hole very easily.

[Brief explanation of the drawing]

The drawings show an embodiment of the present invention; FIG. 1 is a vertical sectional view of the lock bolt fixed inside the hole, FIG. 2 is an enlarged vertical sectional view of the main part showing a modified example of the tube, and FIG. FIG. 3 is a longitudinal cross-sectional view of the lock bolt fixed inside the hole in the embodiment. DESCRIPTION OF SYMBOLS 1... Shaft body, 4... Bag body, 5... First closed space, 6...
Second closed space, 8-11, 13-15...tube.

Claims (1)

[Claims] 1. A bottomed cylindrical body fitted over almost the entire length of the shaft body except for a predetermined length on one end side of the shaft body is attached to the shaft body at a position near the opening thereof and at a position separated from the position near the opening by a predetermined length. to form a first sealed space around one end of the shaft, and a second sealed space around the entire other end of the shaft located in the first sealed space. a tube extending from one end of the shaft body to the other end and opening in the first sealed space; one end opening in the first sealed space and the other end opening in the second sealed space; an open tube, and a second tube extending from one end of the shaft body toward the other end.
A lock bolt characterized in that a tube that opens in a closed space is provided along a shaft body.