JPH0230560Y2 - - Google Patents

Description

[Detailed explanation of the invention] (Industrial application field) This invention is based on the shield type tunnel construction method.
Concerning concrete segments used for tunnel lining.

(Prior Art) FIG. 4 shows a conventional concrete segment, in which a joint fitting 3 is buried in the joint end of a concrete segment main body 2, and the joint fitting 3 is
A corner protector 4 whose front end surface 5 is flush with the joint end surface 6 of the segment main body 2, and whose upper end surface 7 is exposed to the outer surface 8 of the segment main body 2 and is buried outwardly.
, a joint portion 9 whose front end surface 10a is flush with the joint end surface 6 and is buried inward, and a connecting portion 15 that connects the corner protection portion 4 and the joint portion 9. A peripheral wall 12 extends rearward from the periphery of the front end wall 10, and is surrounded by the front end wall 10, the peripheral wall 12, and the segment body 2 to form a space 28 into which a segment joining bolt is inserted. Here, the exposed surface 27 of the segment main body 2 to the space 28 is located at the rear of the rear end surface 14 of the peripheral wall 12. Further, the rear end surface 13 of the corner protection portion 4 is flush with the rear end surface 14 of the peripheral wall 12.

Then, the front end wall 10 of the joint portion 9 of the joint fitting 3
Adjacent segments are joined by a segment joining bolt inserted through a through hole 11 formed in the segment. In addition, on the joint end surface, the joint fitting triangular protection part 4
By pressing them together, the upper edges of the joint end surfaces 6 of the segment bodies 2 are prevented from being pressed against each other and being damaged.

(Problem that the invention attempts to solve) In concrete segments like the above,
If water springs from the tunnel ground, there is a risk that water will enter through the gap between the joint fitting 3 and the segment main body 2 and leak into the segment. In this case, when the invading water reaches the rear end surface 13 of the peripheral wall 12 of the joint part 9 of the joint fitting 3, the water will not be subjected to resistance because the space 28 for inserting the joining bolt is formed beyond that point. Insertion space 2 as shown by the arrow in Figure 4.
8 and leaks into the segment. Furthermore, since the rear end surface 13 of the corner protector 4 is flush with the rear end surface 14 of the peripheral wall 12, the flow path for water entering from the rear end of the corner protector 4 to reach the insertion space 28 is one with little resistance. Therefore, water leakage was likely to occur.

In view of the above, the present invention has been developed so that water that has entered through the gap between the joint fitting and the segment main body is
2 to the rear end surface 14 of the insertion space 28 from there.
An object of the present invention is to provide a concrete segment that can prevent water from leaking into the segment by preventing water from reaching the inside of the segment.

(Means for Solving the Problems) The technical measures taken by the present invention to solve the problems of the prior art are characterized by the fact that the joint fittings 3 are attached to the joint ends of the segment bodies 2 made of concrete. The joint fitting 3 has a front end surface 5 flush with the joint end surface 6 of the segment main body 2, and an upper end surface 7 is exposed to the outer surface 8 of the segment main body 2 and is buried outward. part 4 and front end surface 1
0a is flush with the joint end face 6 and is buried inward, and a connecting part 15 connects the corner protection part 4 and the joint part 9, and a front end wall 10 of the joint part 9. In concrete tunnel segment 1, a peripheral wall 12 extends rearward from the periphery, and is surrounded by front end wall 10, peripheral wall 12, and segment main body 2 to form a space 28 into which a segment joining bolt is inserted. The surface 27 of the main body 2 exposed to the space 28 is the rear end surface 1 of the peripheral wall 12.
4, and the rear end surface 1 of the corner protector 4
3 is located forward of the rear end surface 14 of the peripheral wall 12.

(Function) Since the exposed surface 27 of the segment main body 2 to the space 28 that forms the insertion space 28 for the segment joining bolt is located forward of the rear end surface 14 of the peripheral wall 12, the rear end surface 14 of the peripheral wall 12 In order for the water that has entered the end surface 14 to reach the insertion space 28, it is necessary to once flow between the inner surface 26 of the peripheral wall 12 and the segment main body 2.

In addition, since the rear end surface 13 of the corner protection part 4 is located forward of the rear end surface 14 of the peripheral wall 12, water that has entered from the rear end of the corner protection part 4 can flow to the rear end surface 14 of the peripheral wall 12. The path becomes tortuous and the resistance to the flow increases.

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

Figures 1 to 3 show a concrete segment 1 used for tunnel lining in the shield tunnel construction method, in which a joint fitting 3 is embedded in the joint end of a concrete segment body 2. . The segment 1 has an arc shape, and a plurality of segments are joined to form a ring shape.

In the joint fitting 3, reference numeral 4 denotes a rectangular plate-shaped corner protector embedded in the outer side of the segment main body 2, the front end surface 5 is flush with the joint end surface 6 of the segment main body 2, and the upper end surface 7 is flush with the joint end surface 6 of the segment main body 2. exposed on the outer surface 8 of 2.

Reference numeral 9 denotes a joint part buried inside the segment main body 2, and its front end wall 10 has a semi-elliptical plate shape, and its front end face 10a is flush with the joint end face 6 of the segment main body 2. . The front end wall 10 has an insertion hole 11 for a segment joining bolt, and a peripheral wall 12 extends rearward from the periphery of the front end wall 10 except for the lower end edge. Here, the rear end surface 13 of the corner protector 4 is located further forward than the rear end surface 14 of the peripheral wall 12.

Reference numeral 15 denotes a rectangular plate-shaped connecting portion that connects the corner protection portion 4 and the joint portion 9, and the front end surface 16 is connected to the segment main body 2.
The left and right side surfaces 17 and 18 are flush with the joint end surface 6 of the
is a straight surface located more inward than the left and right side surfaces 19 and 20 of the outer portion 4.

Reference numeral 21 denotes an anchor reinforcing bar threading portion, which is formed in a bulging shape at three positions on the rear end of the outer peripheral surface of the peripheral wall 12. Anchor reinforcing bars 22 that are screwed into the threaded portions 21 are embedded in the segment body 2, thereby firmly fixing the joint fitting 3 to the segment body 2.

A sealing material 23 is filled in a groove 24 formed on the front end surface of the joint fitting 3 and the joint end surface 6 of the segment body 2 to prevent water from leaking between the joints with adjacent segments.

A space 28 is formed surrounded by the joint portion 9, the peripheral wall 12, and the segment main body 2, into which a segment joint bolt is inserted. Here, the space 2 of the segment body 2 forming the space 28 is
The exposed surface 27 to the peripheral wall 12 is located further forward than the rear end surface 14 of the peripheral wall 12 . The space 28 is formed by placing the core at the space forming position and then pouring concrete for the segment body.

According to the segment 1 having the above configuration, the corner protector 4
The rear end surface 13 is located forward of the rear end surface 14 of the peripheral wall 12. Therefore, when water enters through the gap between the rear end of the corner protector 4 and the segment main body 2, the water must pass through a curved flow path as shown by the arrow in FIG. , and the resistance to flow is greater than that shown in the conventional Figure 4.

Further, the exposed surface 27 of the segment main body 2 to the joining bolt insertion space 28 is connected to the rear end surface 1 of the peripheral wall 12.
It is located further forward than 4. Therefore, in order for the water that has flowed up to the rear end surface 14 of the peripheral wall 12 to reach the bolt insertion space 28, it needs to flow through the gap between the inner surface 26 of the peripheral wall 12 and the segment body 2, as shown by the arrow in FIG. be. As a result, in the conventional case shown in FIG. 4, there is little resistance for the invading water to reach the accommodation space 28 from the rear end surface 14 of the peripheral wall 12, but the water encounters a large resistance.
The rear end surface 13 of the corner protection part 4 is the rear end surface 14 of the peripheral wall 12.
This combined with the fact that it is located further forward than the segment, makes it difficult for water to leak into the segment.

(Effects of the invention) According to the invention, when water enters through the gap between the joint fitting and the segment main body, the flow path on the rear end surface of the peripheral wall of the joint becomes curved, increasing resistance to the flow. In addition, in order for the invading water to reach the space for inserting the segment joining bolt from the rear end surface of the peripheral wall, it must flow between the inner surface of the peripheral wall and the segment body, and as a result of encountering resistance, it is difficult to enter the inside of the segment. It is said to be less likely to cause water leaks.

[Brief explanation of the drawing]

FIG. 1 is a side sectional view of a main part of a segment according to an embodiment of the present invention, FIG. 2 is a front view of the same, FIG. 3 is a perspective view of the same, and FIG. 4 is a side sectional view of a main part of a segment according to a conventional example. It is. 1...Segment, 2...Segment body {6
... joint end surface, 8 ... outer surface, 27 ... exposed surface},
3... Joint fitting, 4... Corner protection part {5... Front end surface, 7... Upper end surface, 13... Rear end surface}, 9... Joint part {10... Front end wall, 10a... Front end surface} ,
12... Peripheral wall {14... Rear end surface}, 15... Connection portion, 28... Space for bolt insertion.

Claims (1)

[Scope of utility model registration request] A joint fitting 3 is buried in the joint end of the segment body 2 made of concrete, and the front end surface 5 of the joint metal fitting 3 is flush with the joint end surface 6 of the segment body 2, and the upper end surface 7 is flush with the joint end surface 6 of the segment body 2. External surface 8
a corner protection part 4 that is exposed to the outside and buried on the outside;
The joint portion 9 includes a joint portion 9 whose front end surface 10a is flush with the joint end surface 6 and is buried inward, and a connecting portion 15 that connects the corner protection portion 4 and the joint portion 9.
A concrete segment for tunnels in which a peripheral wall 12 extends rearward from the periphery of the front end wall 10, and is surrounded by the front end wall 10, the peripheral wall 12, and the segment body 2 to form a space 28 into which a segment joining bolt is inserted. 1, the exposed surface 27 of the segment body 2 to the space 28 is located forward of the rear end surface 14 of the peripheral wall 12, and the rear end surface 13 of the corner protection part 4 is located forward of the rear end surface 14 of the peripheral wall 12. Concrete segment for tunnels characterized by: