JPH07305594A - Blocking structure for joint recessed section in concrete segment - Google Patents

Abstract

PURPOSE:To enable the recessed joint sections of concrete segments to be easily blocked flat in a short time, and also prevent fillers from falling off. CONSTITUTION:A blocking cover 20 provided with a spring hook 22 to be engaged with an engaging groove 11 formed in each joint fitting 7, is employed in the back face of a cover main body 21 which blocks two adjacent joint recessed sections 8 in a lump. In actions for blocking the joint recessed sections 8, when the spring hook 22 is engaged with the engaging groove 11 of each joint fitting 7, let the cover main body 21 simultaneously block the joint recessed sections 6 in a state that it is flush with the inner surface 3 of each segment 1, and mortar M is then filled in the insides of the joint recessed sections 8.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a concrete segment in which a large number are connected to form a tunnel wall, and a joint recess for bolt connection formed on the inner surface of the joint is closed to finish the inner surface of the tunnel smooth. Regarding

[0002]

2. Description of the Related Art A so-called shield construction method for constructing a tunnel is generally constructed by assembling a cylindrical wall body by installing a large number of arc-shaped segments on a peripheral wall having a substantially circular cross section obtained by excavating the ground with a shield machine. This is a construction method in which this is used as a primary lining, and the inner surface of the lining is then subjected to secondary winding with concrete or the like for secondary lining.

FIG. 4 shows an example of a conventional RC (reinforced concrete) segment 1. This segment 1 is formed of reinforced concrete into an arc plate shape, and has a segment body 4 having a curved outer surface 2 and inner surface 3.
On the inner surface 3 side of each joint end surface 5 along the width direction (axial direction) and the length direction (circumferential direction), a plate-shaped joint fitting (joint member) 7 having a bolt insertion hole 6 in the center is embedded. A joint recess 8 for connecting bolts is formed in the segment main body 4 at the inner side of the joint fitting 7. Then, as shown in FIG. 5, bolts 9 are inserted from the joint recesses 8 of the one segment 1 into the bolt insertion holes 6 which are aligned at the same time when the joining end faces 5 are aligned with each other, and the nuts 10 are inserted from the joint recesses 8 of the other. Is screwed onto the bolt 9 and the joint fittings 7 are fastened to connect the segments 1 to each other.

By the way, in the shield construction method, secondary lining is carried out by performing secondary winding with concrete after the primary lining. In recent years, however, the appearance of concrete segments having good corrosion resistance and the improvement of economic efficiency have been considered. In view of this, it has been desired to obtain the tunnel peripheral wall only by the primary lining without applying the secondary lining.

When only the primary lining is used as described above, in the segment 1 shown in FIGS. 4 and 5, the appearance is improved, the joint fitting 7, the bolt 9, the nut 10, etc. are rustproofed, and the segment 1 For the purpose of improving the strength of 1 itself, a solidifying material such as mortar is embedded in the joint recess 8 and its surface is flush with the inner surface 3 of the segment body 4. In filling the joint recess 8 with a solidifying material such as mortar, a method of closing the joint recess 8 with a plate or the like, injecting the solidifying material through a hole formed in the plate, and removing the plate after curing Is being considered.

[0006]

The joint recess 8 is formed by the above method.
It is easily assumed that the method of closing the surface of the joint is complicated and time-consuming, and there is a concern that the solidified material after curing may fall from the joint recess 8.

The present invention has been made in view of the above circumstances, and has a structure for closing a joint recess of a concrete segment which can easily close the joint recess of the concrete segment in a short time without causing the filler to drop. Is intended to provide.

[0008]

SUMMARY OF THE INVENTION The present invention has been made to achieve the above object, and an engaging portion is formed on each of inner surfaces of a pair of joint members to be fastened facing the joint recess. An elastic engaging member of the closing lid, which includes a plate-shaped lid main body and an elastic engaging member which is provided on the back surface of the lid main body and elastically engages with the engaging portion, In this state, the surface of the lid body is substantially flush with the inner surface of the segment.

Further, an elastic piece elastically deformed by slidingly contacting the elastic engaging member of the closing lid with the joint member in the process of moving the lid main body toward the joint recess, and the lid main body are fitted in the joint recess. And a configuration in which the elastic piece is engaged with the engaging portion by the returning operation of the elastic piece.

[0010]

According to the present invention, when the elastic engaging member of the closing lid is elastically engaged with the engaging portion of the joint member, the lid body closes the joint recess flush with the inner surface of the segment. Since the work of closing the joint recess is completed easily and in a short time, and the closing lid is engaged with the joint member and cannot be disengaged, there is no fear that the solidified material such as mortar filled in the joint recess falls.

An elastic piece elastically deformed by slidingly contacting the elastic engagement member of the closing lid with the joint member in the process of moving the lid body toward the joint recess, and the lid body are fitted in the joint recess. When the elastic piece is configured to include an engaging piece that engages with the engaging portion by the returning operation of the elastic piece at the time point, the closing lid is pushed toward the joint concave portion to the joint member of the elastic engaging member by one operation. And the lid body closes the joint recess.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 shows a state in which concrete segments 1 are connected to each other by the structure of one embodiment.
The same components as those in FIG. 5 are designated by the same reference numerals to simplify the description. An engagement groove 11 extending in the width direction of the segment 1 is formed on the inner surface of the joint fitting 7 facing the joint recess 8 on the inner surface 3 side of the bolt insertion hole 6 in this case. A counterbore 12 that widens in the opening direction is formed at the peripheral edge portion of the opening of the joint recess 8 in the segment body 4.

Reference numeral 20 is a closing lid, and this closing lid 20
As shown in FIG. 2, includes a lid body 21 and a spring hook (elastic engagement member) 22 provided on the back surface of the lid body 21. The lid main body 21 is formed into a rectangular shape that exactly closes the openings of the pair of joint recesses 8 that are adjacent to each other by joining the segments 1 together.
A tapered surface 23 is formed to fit. The lid body 21 is
It is preferably made of a material having high corrosion resistance such as fiber concrete. A pair of recesses 24 are formed in the center of the back surface of the lid main body 21 and are aligned in the lengthwise direction, and a fixing portion 25 is provided between them.
The spring hook 22 is fixed to the fixing portion 25. In addition, mortar inlets 26 are formed near both ends of the lid body 21.

In the spring hook 22, a base portion 30 extending in the longitudinal direction of the lid body 21, an arm portion 31 extending orthogonally from both ends of the base portion 30, and a tip portion 32 bending inward from the tip of the arm portion 31 are elastic. The leaf spring material has a substantially C-shape integrally formed and is an elastic piece as a whole, so that the tip end portion 32 is elastically deformed such that the tip end portion 32 moves away from or approaches the tip end portion 32. The spring hook 22 has a base portion 30 housed in a recess 24 of the lid body 21 so as to be elastically deformable, and the center of the base portion 30 is embedded flush with the fixing portion 25. That is, the recess 24 is set to a size that allows the spring hook 22 to elastically deform.

The closing lid 20 having the above-described structure is provided with a spring hook 22.
End portion 32 of each of the fittings 7 engages with the engaging groove 11 of each fitting 7, and the arm portion 31 abuts on the inner surface of the fitting 7.
The tapered surface 23 of the lid body 21 is aligned with the spot facing 12,
Its surface is flush with the inner surface 3 of the segment 1 and closes the openings of both joint recesses 8. Then, after both joint recesses 8 are closed by one closing lid 20 in this way,
The mortar (solidifying material) M is filled into each joint recess 8 from the mortar inlet 26. The filling of the mortar M is optional, and if not necessary, the mortar inlet 26 is not formed in the lid body 21.

In order to close both joint recesses 8 with the closing lid 20 as described above, as shown in FIGS. 3 (a) to 3 (c), the joint fittings 7 are fastened with bolts 9 and nuts 10. Then, attach both ends 32 of the spring hook 22 to the fitting 7
, And the closing lid 20 is pressed against the joint recess 8 side from that state. Then, the tip end portion 32 is elastically deformed and spreads by being pushed by the joint fitting 7, and the closing lid 20 can be moved to the joint recess 8 side. During the movement, the tip portion 32 slides on the inner surface of the fitting 7, and the tip portion 32 fits into the engagement groove 11, and at the same time, the lid body 21 closes the joint recess 8. In addition, a notch 13 is formed at the center of the end of the fitting 7 on the inner surface 3 side as an escape for accommodating the closing lid 20.

According to the structure for closing the joint recess 8 of the present embodiment, the closing lid 20 is pressed toward the joint recess 8 so that the tip 32 of the spring hook 22 is engaged with the engaging groove 11 of the joint fitting 7. With such a simple operation as described above, the joint recesses 8 of both the connected segments 1 can be collectively closed by the closing lid 20. That is, the work of closing the joint recess 8 can be performed easily and in a short time. Further, in the closing lid 20, the spring hook 22 elastically engages with the engaging groove 11 of the joint fitting 7, and therefore, there is no fear that the mortar M filled in the joint recess 8 falls.

[0018]

As described above, according to the joint recess closing structure in the concrete segment of the present invention, the engaging portions are respectively formed on the inner surfaces of the pair of joint members to be fastened facing the joint recess. , A plate-shaped lid main body, and an elastic engaging member of a closing lid, which is provided on the back surface of the lid main body and elastically engages with the engaging portion, engages with the engaging portion,
In this state, the surface of the lid main body is made to be substantially flush with the inner surface of the segment, and the closing work of the joint recess is completed easily and in a short time, and the closing lid engages with the joint member. Therefore, there is no possibility that the solidified material such as mortar filled in the joint recess falls. Also, when the elastic engagement member of the closing lid is elastically deformed by sliding contact with the joint member in the process of moving the lid body toward the joint recess, and when the lid body is fitted into the joint recess. When the elastic piece is configured to include an engaging piece that engages with the engaging portion by the returning operation of the elastic piece, the elastic engaging member is moved to the joint member by one operation of pressing the closing lid toward the joint recess. Engagement and closure of the joint recess by the lid body facilitate the work.

[Brief description of drawings]

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

FIG. 2 is a plan view of a closing lid.

FIG. 3 is a side view showing a procedure for closing the joint recess with a closing lid, where (a) is an initial stage, (b) is an intermediate stage,
(C) is an end state.

FIG. 4 is a perspective view showing a general example of a concrete segment.

FIG. 5 is a side sectional view of a joint portion of the same segment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Concrete segment 3 Inner surface of segment 4 Segment body 5 Joining end face 7 Joint fitting (joint member) 8 Joint recess 9 Bolt 11 Engagement groove 20 Closing lid 21 Lid body 22 Spring hook (elastic engaging member) 26 Mortar injection port 30 Base 31 Arm 32 Tip M Mortar

Claims (3)

[Claims] 1. A joint member embedded in a joint end face of a concrete segment to be joined is joined together,
After fastening these joint members with a bolt that penetrates both joint members from one of the joint recesses formed inside both joint members, each joint recess is formed into a segment in which the joint recess is formed. A structure that closes substantially flat along the inner surface, wherein an engaging portion is formed on the inner surface facing the joint recess of the pair of joint members to be fastened, and a plate-shaped lid main body and the lid main body Of the closing lid, which is provided on the back surface of the closing lid and elastically engages with the engaging portion, by engaging the elastic engaging member with the engaging portion, A closure structure for a joint recess in a concrete segment, characterized in that the lid main bodies are fitted in both joint recesses so as to be substantially flush with the inner surface of the segment. 2. The joint members embedded in the joint end faces of the concrete segments to be joined are joined together,
After fastening these joint members with a bolt that penetrates both joint members from one of the joint recesses formed inside both joint members, each joint recess is formed into a segment in which the joint recess is formed. A structure that closes substantially flat along the inner surface, wherein an engaging portion is formed on the inner surface facing the joint recess of the pair of joint members to be fastened, and a plate-shaped lid main body and the lid main body Of the closing lid, which is provided on the back surface of the closing lid and elastically engages with the engaging portion, by engaging the elastic engaging member with the engaging portion, The lid body is fitted into both joint recesses so that they are substantially flush with the inner surface of the segment, and the joint recess is filled with a solidifying material such as mortar, etc. Closed structure. 3. The elastic engagement member of the closing lid elastically deforms by slidingly contacting the joint member in the course of the closing operation of moving the lid main body toward the joint recess, and The joint recess of the concrete segment according to claim 1 or 2, further comprising an elastic piece that engages with the engaging portion by an elastic return operation when the main body is fitted into the joint recess. Closed structure.