JPH033677Y2 - - Google Patents

Description

[Detailed Description of the Invention] (Industrial Application Field) The present invention relates to a joint fitting for a concrete segment used for lining a tunnel in a shield type tunnel construction method.

(Prior Art) FIG. 6 shows a conventional joint fitting 1, in which the front end surface 2 is flush with the joint end surface 4 of the concrete segment body 3, and the upper end surface 5 is exposed to the outer surface 6 of the segment body 3. Buried. Adjacent segments are then joined together via bolts inserted into through holes 7 formed in the front end surface 2. Also,
At the joining end surfaces 4 of the segments, the front edges 8 of the upper end surfaces 5 of the joint fittings 1 are pressed against each other, thereby preventing the upper end edges of the joining end surfaces 4 of the segments from being pressed against each other and damaged. Note that 9 is a seal filled in the groove 10 of the joint end surface 4.

(Problem that the invention attempts to solve) In concrete segments like the above,
There is a very small gap at the boundary between the upper end surface 5 of the fitting 1 and the outer surface 6 of the segment main body 3, and at the boundary between the front end surface 2 of the fitting 1 above the seal 9 and the joint end surface 4 of the segment main body 3. Therefore, if water springs from the ground, there is a risk that water may enter through the gaps and leak into the interior. In this case, the larger the circumferential length of the upper end surface 5 of the joint fitting 1, the larger the water flow path becomes, making it easier for water to enter. However, since the front edge 8 of the upper end surface 5 of the fitting 1 comes into pressure contact with the front edge of the upper end surface of the adjacent fitting, its circumference must have a certain dimension, and a certain amount of spring water may enter from the ground. is unavoidable.

In view of the above, the present invention has been developed to prevent water from entering the inside of the segment through the gap between the upper end surface of the fitting and the outer surface of the segment body, and the boundary between the front end surface of the fitting and the joint end surface of the segment main body. The purpose of the present invention is to provide a fitting that can prevent water from leaking.

(Means for Solving the Problems) The technical measures taken by the present invention to solve the problems of the prior art are characterized by a joint buried in the joint end of the concrete segment body 11a. A corner protection part 13 of the metal fitting 12, in which the front end surface 14 is flush with the joint end surface 15 of the segment main body 11a, and the upper end surface 16 is exposed to the outer surface 17 of the segment main body 11a and is buried on the outer side. , a joint portion 18 whose front end surface 19 is flush with the joint end surface 14 and is buried inward; and a front end surface 26 which is located rearward of the front end surface 14 of the corner protector 13 and which is located on the left and right sides. 27 and 28 are provided with a connecting portion 25 which is located inwardly than the left and right side surfaces 29 and 30 of the corner protecting portion 13 and connects the corner protecting portion 13 and the joining portion 18.

(Function) The front end surface 26 of the connecting portion 25 is located rearward than the front end surface 14 of the corner protecting portion 13, and the left and right side surfaces 27, 28 of the connecting portion 25 are located closer to the left and right side surfaces 29, 28 of the corner protecting portion 13.
30, the circumferential length of the connecting portion 25 is shorter than the circumferential length of the corner protecting portion 13. Therefore, the upper end surface 1b of the corner protector 13, the outer surface 17 of the segment main body 11a, and the corner protector 13
Since water entering through the gap between the front end surface 14 of the front end surface 14 and the joint cross section 15 of the segment main body 11a must pass through the outer periphery of the connecting portion 25 in order to reach the inside of the segment, the circumferential length of the corner protecting portion 13 is shortened. This means that the flow path for water into the interior of the segment has been reduced without causing any damage.

In addition, in order for the water that has entered through the gap between the front end surface 14 and the left and right side surfaces 29 and 30 of the corner protection part 13 to reach around the connecting part 25, it is necessary to flow down the bottom surface 34 of the corner protection part 13, and the water flows The road is said to be winding, making it difficult for water to flow.

(Example) Hereinafter, an example of the present invention will be described based on the drawings.

In FIG. 2, reference numeral 11 indicates a concrete segment, which is used for lining a tunnel in the shield tunnel construction method. The segment body 11a has an arc shape, and a plurality of segment bodies 11a are joined in a ring shape, and a joint fitting 12 as shown in FIG. 1 is embedded in the joint end of the segment body 11a made of reinforced concrete. .

In the joint fitting 12, reference numeral 13 denotes a rectangular plate-shaped corner protector, whose front end surface 14 is flush with the joint end surface 15 of the segment body 11a, and whose upper end surface 16 is exposed to the outer surface 17 of the segment body 11a. It is buried on the outer side of the main body 11a.

Reference numeral 18 denotes a joint part, which is buried inside the segment so that its front end surface 19 is flush with the joint end surface 15 of the segment main body 11a, and a joint bolt insertion space 37 is formed inside. There is. The joint portion 18 has a semi-elliptical front end wall surface 20 and a peripheral wall 21 extending rearward from the periphery of the front end wall surface 20 except for the lower edge, and the lower surface and the rear surface are open. A bolt through hole 22 is formed in the front end wall surface 20, and an anchor reinforcing bar screwing part 23 is formed in the outer surface of the peripheral wall 21. An anchor reinforcing bar 25 screwed into the threading part 23 connects the joint fitting 12 to the segment main body. 1
Fixed within 1a.

Reference numeral 25 denotes a rectangular plate-shaped connecting portion, which connects the corner protecting portion 13 and the joint portion 18, and has a front end surface 26 located behind the front end surface 14 of the corner protecting portion 13, and left and right side surfaces 27, 28 is located more inward than the left and right side surfaces 29 and 30 of the corner protection portion 13. A water leakage prevention seal member 31 is wrapped around the outer periphery of the connecting portion 25. The seal member 31
For example, there are rubber materials that have the property of expanding when they absorb water, and materials that contain active groups such as carboxy groups, such as recycled butyl rubber, and that chemically bond with metal hydroxides in ready-mixed concrete to produce an adhesive effect. preferable.

Then, the joint end surface 15 of the segment main body 11a
There is a groove 32 between the corner protection part 13 and the joint part 18.
is formed, and the groove 32 is filled with a sealing member 33.

Segment body 1 in which the above-mentioned joint fittings 12 are embedded
1a is joined to the adjacent segment by inserting a bolt into the bolt through hole 22 from the open lower surface of the joint portion 18. In this bonded state, the corner protector 1
By pressing the three comrades, the segment main body 11a
This prevents the upper edges of the joining end surfaces 15 from coming into contact with each other and being damaged.

If spring water comes from the tunnel ground,
The water leaks through a very small gap at the boundary between the upper end surface 16 of the corner protector 13 and the outer surface 17 of the segment body 11a, and at the boundary between the front end surface 14 of the corner protector 13 and the joint end surface 14 of the segment body 11a. Trying to get in through the smallest of gaps. In order for the water to reach the inside of the segment main body 11a, it needs to flow from the lower surface 34 of the corner protection part 13 to the outer periphery of the connecting part 25. Here, the front end surface 26 of the connecting portion 25 is located rearward than the front end surface 14 of the corner protecting portion 13, and the left and right side surfaces 27, 28 of the connecting portion 25 are located more inwardly than the left and right side surfaces 29, 30 of the corner protecting portion 13. Therefore, the circumferential length of the connecting portion 25 is shorter than the circumferential length of the corner protecting portion 13. As a result, even if the flow path through which spring water from the ground reaches the inside of the segment main body 11a is large at the outer periphery of the corner protection part 13, which is the water inlet, it can be made small at the outer periphery of the connecting part 25. , water can be prevented from leaking into the segment.

In addition, in order for the water that has entered through the gap between the front end surface 14 and the left and right side surfaces 29 and 30 of the corner protection part 13 to reach around the connecting part 25, it is necessary to flow down the bottom surface 34 of the corner protection part 13, and the water flows The road is said to be winding, making it difficult for water to flow through it. This prevents water from leaking into the segment.

Furthermore, in this embodiment, by wrapping the sealing member 31 around the connecting portion 25, water leakage can be more completely prevented.

FIG. 3 shows an embodiment different from the embodiment described above, and the difference is that the rear end surface 35 of the connecting part 25 is located forward of the rear end surface 36 of the corner protection part 13 in the embodiment described above. In this embodiment, they are flush. The other configurations are the same as those of the previous embodiment and are indicated by the same reference numerals. This embodiment also provides the same effects as the previous embodiment. However, in the embodiment described above, the flow path of water entering from the rear end surface 36 of the corner protection part 13 to the outer periphery of the connecting part 25 is bent, so that the water leakage prevention effect is greater.

FIGS. 4 and 5 relate to embodiments that are further different from each of the embodiments described above, and the differences will be explained below.

In the joint fitting 12, since it is necessary to insert a bolt for connecting adjacent segments into the bolt through hole 22, a bolt insertion space 37 which is not filled with concrete is required behind the front wall 20 of the joint portion 18. Therefore, in each embodiment, the joint portion 1
A portion surrounded by the peripheral wall 21 of 8 is a bolt insertion space 37. In each of the embodiments described above, the rear end surface 38 of the peripheral wall 21 of the joint portion 18 is parallel to the front wall 20, but in the present embodiment, the upper end 39 of the peripheral wall 21 is projected more rearward than the lower end surface. As a result, as shown in FIG.
9 is a bolt insertion space 37 and a segment body 1
It is buried in the segment body 11a deeper than the interface 40 with the segment body 1a. Then, corner protection part 1
In order for water entering from the outer periphery of the peripheral wall 21 to reach the inside of the segment, it flows through the gap between the joint fitting 12 and the segment main body 11a as a flow path. The more buried it is, the longer the water flow path becomes, which helps prevent water leakage. The rest of the structure is similar to that of FIG. 1 and is designated by the same reference numerals.

(Effect of the invention) According to the invention, the circumferential length of the connecting part is made shorter than the circumferential length of the corner protecting part, thereby reducing the flow path of water entering the segment from the outer periphery of the corner protecting part. , the circumferential length of the corner protector can be made smaller without shortening it. Thereby, it is possible to prevent water from leaking into the segment while maintaining the effect of preventing the joint end surface of the segment from being damaged by the front edge of the upper end surface of the corner protector. Furthermore, water leakage can be prevented by making the water flow path curved and making it difficult for water to flow.

[Brief explanation of the drawing]

FIG. 1 is a perspective view of a joint fitting according to an embodiment of the present invention, FIG. 2 is a perspective view of a joint end of the same segment,
3 is a side view of a fitting according to a different embodiment, FIG. 4 is a perspective view of a fitting according to a further different embodiment, FIG. 5 is a side view of the same, and FIG. 6 is a segment according to a conventional example. FIG. 11... Segment, 11a... Segment body, {15... Joint end surface, 17... Outer surface}, 12...
...Joint fitting, 13... Corner protection part, {14... Front end surface, 16... Upper end surface, 29, 30... Left and right side surfaces},
18... Joint portion {19... Front end surface}, 25... Connection portion {26... Front end surface, 27, 28... Left and right side surfaces}.

Claims (1)

[Scope of utility model registration request] A joint fitting 12 buried in a joint end of a concrete segment main body 11a, which has a front end surface 1.
4 is flush with the joint end surface 15 of the segment body 11a, and the upper end surface 16 is flush with the joint end surface 15 of the segment body 11a.
a corner protection part 13 that is exposed on the outer surface 17 of a and buried on the outside side, and a joint part 18 whose front end surface 19 is flush with the joint end surface 14 and is buried on the inside side.
The front end surface 26 is located rearward of the front end surface 14 of the corner protection part 13, and the left and right side surfaces 27, 28 are located inwardly of the left and right sides 29, 30 of the corner protection part 13. A joint fitting for a concrete segment, characterized in that it is provided with a connecting part 25 that connects the and the joint part 18.