JP3218185B2 - Injection hole plug for tunnel segment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION The present invention is to permit the injection of grout, to the inner peripheral surface of the female screw portion grout injection hole provided on the segment side substrate while having a sealing member
The present invention relates to an injection hole plug of a tunnel segment having a male screw portion that can be screwed into a state in which the grout injection hole is closed by being sandwiched .

[0002]

2. Description of the Related Art In a conventional injection plug for a tunnel segment, connection between segments is terminated, grout is injected from the grout injection hole, and then screwed into the grout injection hole to close the grout injection hole. It is for doing. Some conventional injection hole plugs are simply formed by casting or the like.

[0003]

However, the above-mentioned conventional injection hole plug has the following problems. For example, in a portion connecting tunnels dug from two directions, a so-called freezing method of freezing nearby soil may be used in order to temporarily harden soft ground or to increase water stoppage. On the other hand, although grout has already been injected, groundwater and the like may accumulate outside the injection hole plug. In this case, when the freezing method is performed, there is an inconvenience that water accumulated outside the injection hole plug solidifies and expands, and the injection hole plug is damaged.

[0004] An object of the present invention is to solve the above-mentioned drawbacks of the prior art, and even if water accumulated outside the injection hole plug solidifies, it absorbs the volume expansion of the water and does not break. An object of the present invention is to provide an injection hole plug for a tunnel segment.

[0005]

(Structure 1) The injection hole plug of the tunnel segment according to the present invention is characterized in that:
As described in the above, having a concave portion facing the outside of the tunnel, non- water permeable, and water intrusion of the sealing material
It is characterized in that a buffer capable of contracting volume is provided inside the recessed portion while maintaining the function of preventing the above. (Operation / Effect) According to the injection hole plug of the present configuration, the amount of water that has conventionally accumulated in the recessed portion outside the injection hole plug itself can be reduced, and water that cannot prevent storage is solidified. Also, when the volume expansion, the function of preventing water from entering the sealing material
Can be absorbed by the shrinkage of the buffer while maintaining the above condition .
Therefore, excessive pressure does not act on the injection hole plug, so that damage to the injection hole plug can be prevented, and water leakage from the injection hole into the tunnel can be prevented. In addition, the injection hole plug of the present invention is simply provided with the above-mentioned buffer inside the conventional injection hole plug, so that it is easy to improve and economical.

(Structure 2) The injection hole plug of the tunnel segment according to the present invention is described in claim 2.
As described in the above, the buffer can be made of a resin having an independent space inside. (Operation / Effect) As the buffer of this configuration having an independent space inside, for example, a substantially cylindrical bag-shaped member molded of resin can be considered, but it is relatively difficult to manufacture a buffer of such a configuration. Easy. Moreover, it is easy to mount the buffer body formed alone inside the injection hole plug, and in this case, the injection hole plug can be used without any improvement from the conventional one. .

[0007]

Embodiments of the present invention will be described below with reference to the drawings. The injection hole plug 1 of the tunnel segment according to the present invention (hereinafter simply referred to as “injection hole plug 1”) is attached to a tunnel segment for constructing the inner peripheral wall of the tunnel, for example, as shown in FIG. This tunnel segment is, for example, a ductile segment,
Alternatively, any of a concrete segment, a steel segment and the like may be used. In the present embodiment,
An example will be described in which the antenna is attached to a ductile segment (hereinafter, simply referred to as “segment S”). In FIG.
The injection hole plug 1 is shown attached to a grout injection hole 2 (hereinafter simply referred to as “injection hole 2”) provided in the segment S. FIG. 2 shows an example in which the injection hole 2 is provided directly to the segment S.
Separately, a member provided with the injection hole 2 may be formed by attaching to the segment S. Therefore, hereinafter, the portion provided with the injection hole 2 is referred to as a segment-side substrate S1.

(Injection Hole) The injection hole 2 is provided substantially at the center of the segment S so as to penetrate in the thickness direction of the segment S. The injection hole 2 is for injecting the grout 3 into the gap between the excavated tunnel shaft and the segment S when the connection of the series of the segments S arranged in the circumferential direction of the tunnel is completed. The injection hole 2
A female screw portion 4 for screwing the injection hole plug 1 is provided on the peripheral wall portion. At the end of the injection hole 2 on the inner surface side of the tunnel, a large-diameter hole portion 5 having an inner diameter larger than the outer diameter of the female screw portion 4 is continuously provided.

(Injection Hole Plug) As shown in FIGS. 2 and 3, the injection hole plug 1 has a male screw portion 1A and a flange portion 6, and closes the injection hole 2 with respect to the injection hole 2. It can be screwed into a state where it does. In a state after the injection hole plug 1 is screwed into the injection hole 2, the flange portion 6 is located inside the enlarged diameter hole portion 5, and the end face of the flange portion 6 on the inner side of the tunnel is The segment base material S1 is flush with the inner surface of the tunnel or retreated from the surface of the segment base material S1. A recess 7 is formed at the end of the injection hole plug 1 on the outside of the tunnel. The concave portion 7 is provided with the male screw portion 1.
A is drilled from the end of A along the axis X direction of the injection hole plug 1, and the male screw portion 1 along the direction of the axis X is provided.
It is formed to a depth substantially equal to the length of A. A buffer 8 that is non-immersible and that can contract in volume is attached to the recess 7. At the time of this mounting, it is desirable that the exposed side end of the buffer 8 should not be withdrawn as much as possible from the end of the male screw portion 1A. In other words, after the injection hole plug 1 is mounted, the amount of water accumulated inside the injection hole 2 is reduced as much as possible to suppress the total volume expansion when water solidifies. The buffer 8 has a shape having an independent space 9 inside, for example, in a sealed bag shape, and is made of resin,
It is formed of rubber or metal. The male screw portion 1A
The external thread 1 is located at the boundary between the
A seal member 10 is attached around A. When the injection hole plug 1 is screwed into the injection hole 2, the sealing material 10 is sandwiched between the enlarged diameter hole portion 5 and the flange portion 6 to prevent groundwater and the like from entering the tunnel. It has a function to do. The injection hole plug 1 can be manufactured, for example, by casting, or by machining a metal material.
Alternatively, it can be manufactured by a method such as injection molding of a resin.

(Check Valve) Prior to screwing the injection hole plug 1 into the injection hole 2, a check valve 11 is usually screwed into the injection hole 2. As shown in FIG. 2, the check valve 11 has a male screw portion 11A on its outer peripheral portion.
And a through hole 12 in the same direction as the direction in which the injection hole 2 extends. The through holes 12 allow the grout 3 to be injected.
Is provided with a valve 13. The valve body 13 has, for example, a semicircular shape, and two valve bodies 13 are attached to the support 14. The support 14 is, for example, a rod-shaped member, and is attached to the inner wall of the through hole 12 so as to be located in the radial direction of the through hole 12. The two valve bodies 13 are swingable about the support 14. Also, at the inner end of the check valve 11 on the inner side of the tunnel,
A valve body stopper 15 protruding toward the center of the through hole 12 is provided over the entire circumference. Thereby, grout injection toward the outside of the segment S can be permitted, and backflow of the grout 3 once injected can be prevented. The support 14 or the valve 13 can be formed using any material. Further, it is not always necessary to form both parts separately, and they may be integrally formed using a resin or the like. However, the check valve 11 is
Although the grout 3 has a check function, it does not have a check function for groundwater or the like.

(Function) After the check valve 11 is screwed into the injection hole 2 to a predetermined position, the injection hole plug 1 is screwed into the injection hole 2 continuously. The injection hole plug 1 is screwed into the sealing material 10.
However, this is performed so as to be in a state in which it is subjected to appropriate deformation due to the pressure between the stepped portion 5A of the enlarged diameter hole portion 5 and the flange portion 6 of the injection hole plug 1 so that the water stopping function can be exhibited.

Now, assume that the soil around the segment S is frozen using the freezing method. In this case, the grout 3 has already been injected to the outside of the segment S, but the cold heat reaches the segment S via the grout 3 as the soil freezes. As a result, the water accumulated outside the injection hole plug 1 is also cooled and solidified. However, although the volume of water expands, the buffer 8 can absorb the expanded amount of water by contracting its own volume. Therefore, excessive pressure is not applied to the injection hole plug 1, and breakage can be prevented.
The volume contraction of the buffer 8 is elastic or
Any of plastic ones may be used. However, the buffer 8 is made of, for example, a resin having a space inside,
If it is configured to be capable of elastic contraction, it can be used repeatedly. In addition, even when not repeatedly used, the injection hole plug 1 according to the present invention is the same as the conventional injection hole plug 1.
Since it is only necessary to mount the buffer body 8 inside the device, the improvement is easy and the cost increase accompanying the improvement can be slightly suppressed, which is economically advantageous.

In the description of the means for solving the above problems, reference is made to the drawings and, in order to facilitate comparison with the drawings, reference numerals are used, but the invention is limited to the configuration shown in the accompanying drawings. Not something.

[Brief description of the drawings]

FIG. 1 is an explanatory view showing a mounting position of an injection hole stopper according to the present invention.

FIG. 2 is a longitudinal sectional view showing a state where an injection hole stopper according to the present invention is attached.

FIG. 3 is an exploded perspective view showing a procedure for installing an injection hole stopper according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Injection hole plug of tunnel segment 1A Male screw part 2 Grout injection hole 3 Grout 4 Female screw part 7 Depressed part 8 Buffer 9 Independent space 10 Sealing material S1 Segment side base material

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-7-279590 (JP, A) JP-A-8-100654 (JP, A) JP-A-7-49029 (JP, A) JP-A-7-279 331852 (JP, A) Utility model registration 3018611 (JP, U) Utility model registration 3021700 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B65D 39/08 E21D 11/08 E04F 15 / 04 E05F 15/18

Claims (2)

(57) [Claims] 1. To enable the grout (3) to be injected,
To grout injection hole on the inner peripheral surface provided on the female threaded portion (4) while having a segment-side substrate (S1) (2), sheet
An injection hole plug (1) for a tunnel segment having a male thread portion (1A) that can be screwed into a state in which the grout injection hole (2) is closed with a steel material (10) interposed therebetween; And has a concave portion (7) facing the outside, is non- water permeable, and prevents water from entering the sealing material (10).
An injection hole plug for a tunnel segment provided with a buffer (8) capable of contracting volume while maintaining a stopping function inside the recess (7). 2. The injection hole plug for a tunnel segment according to claim 1, wherein said buffer (8) is made of a resin having an independent space (9) inside.