JPH0376999A - Joining method of concrete segment and joint structure of concrete segment - Google Patents

Abstract

PURPOSE:To increase joint strength, and to improve workability by bolt a segment in which a protruding section is formed to a junction and face and a clamping bolt is inserted previously into a bolt inserting hole, and a segment in which a groove section is shaped to a junction end face. CONSTITUTION:A segment 1' in which a protruding section 10 is formed to a junction end face 2 and a clamping bolt 7 is inserted into a bolt inserting hole 6 is prepared. A segment 1 in which a groove section 11 conformed to the shape of the protruding section 10 formed to the junction end face 2 is shaped is prepared. The mutual junction end faces 2, 2 are mated to make the bolt inserting holes 6, 6 communicate and screwed with the clamping bolt 7 to cement a pair of the segments 1, 1'. Accordingly, the protruding sections 10 and the groove sections 11 are formed to coupling flanges 5, 5 respectively and the segments 1, 1' are positioned easily while the clamping bolt 7 is inserted previously into the bolt inserting hole 6, and even the long-sized bolt 7 can be joined easily.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Application Field] The present invention relates to a concrete segment joining method and a concrete segment joint structure used, for example, in constructing railway tunnels and underground passages.

[Prior Art] Conventionally, in order to construct the walls of tunnels, sewers, etc., a plurality of arcuate plate-shaped concrete segments (hereinafter simply referred to as segments) that form a cylindrical shape when connected are generally used. A method is used in which these are successively connected in holes drilled underground.

For joining such concrete segments to each other, a joint structure as shown in FIGS. 4 and 5 is known. In this joint structure, the circumferential and axial joint end surfaces 2 of the segments 1 are joined together (in this figure, only the circumferential direction is joined).

A plurality of recesses 3 for attachment work are formed on the inner surface adjacent to the joint end surface 2 of each segment l, and from these recesses 3 one inner surface 4 facing the joint end surface 2 is formed. A joint flange 5 is formed in between, and a bolt insertion hole 6 is formed so as to pass through the joint flange 5 and connect the joint end surface 2 and the recess 3. A fastening bolt 7 is inserted into this bolt insertion hole 6, and both ends of the fastening bolt 7 are fitted with washers 8.
．． 8 and is fastened with a nut 9.

Segment 1 with the above joint structure. To join the segments I, 1, first support the pair of segments I, 1 to be joined using a lifting machine, align their joining end surfaces 2.2, and position them so that their respective bolt insertion holes 6.6 communicate with each other. Adjust. Then, this bolt insertion hole 6.6 is connected to the recess 3.
The fastening bolt 7 is inserted through the hole, and the threaded portions at both ends of the bolt 7 are respectively projected into the recess 3.3. Next, insert the washer 8.8 and nut 9.9 into this protruding thread part in sequence.
A pair of segments 15 screwed together and thus adjacent! can be joined.

[Problems to be Solved by the Invention] However, although the above-described joining method has the advantage that the joint structure is simple and the segments can be easily joined, the joining strength is limited by the thickness of the joint flange 5. Therefore, as the segment becomes larger, increasing the thickness of the joint flange 5 is being considered. However, when the thickness of the joint flange 5 is increased,
Since the fastening bolt 7 is very long, it is difficult to insert the fastening bolt 7 into the bolt insertion hole 6.6 through the recess 3, which is disadvantageous.

Furthermore, if the recess 3 is made larger for the purpose of making it easier to insert the fastening bolt 7 into the bolt insertion hole 6, there is a disadvantage that the strength of the segment 1 itself is reduced.

The present invention was made to solve the above problems, and an object of the present invention is to provide a concrete segment joining method and a concrete segment joint structure that are excellent in joint strength and workability.

[Means for Solving the Problems] The concrete segment joining method according to claim 1 of the present invention includes the above-mentioned method for joining a joint flange provided between a recess formed adjacent to the joining end surface and the joining end surface. In a method of connecting concrete segments by inserting a fastening bolt into the bolt insertion hole of a pair of concrete segments in which the bolt insertion hole is formed so as to penetrate from the joint end surface to the recess, and fastening the bolt with a nut, After inserting a fastening bolt into the bolt insertion hole of one concrete segment in advance, adjust the positions of the concrete segments so that the bolt insertion holes of both concrete segments communicate with each other, and then adjust the positions of the two concrete segments so that the bolt insertion holes of both concrete segments communicate with each other. The concrete segment joint structure according to claim 2 of the present invention has a method of solving the problem by passing the fastening bolt through the inside of the joint and then fastening the fastening bolt with a nut. A bolt insertion hole is formed in the joint flange provided between the joint end face and the joint end face so as to penetrate from the joint end face to the recess, and a fastening bolt is inserted into this bolt insertion hole and fastened with a nut. In a concrete segment joint structure in which concrete segments are connected to each other, a recess is formed in one of the concrete segments by enlarging the diameter of the recess side of the bolt insertion hole, and the recess is formed with an opening at the bottom. The solution is that a bottom cylindrical embedded washer is inserted, and the concrete segments are joined together by a fastening bolt inserted into a bolt insertion hole through this embedded washer.

[Function] Since the fastening bolt is inserted in advance into the bolt insertion hole of one of the segments to be joined to each other, workability during joining does not deteriorate even if the joint flange is thick and the fastening bolt is long.

Further, in the joint structure according to claim 2, the diameter of the recess side of the bolt insertion hole of one segment is expanded to form a recess,
Since the embedded washer is provided in the O recess, the fastening bolt can be fastened at the bottom of the embedded washer, so even if the joint flange is thick, the fastening bolt can be shortened.

Examples] Hereinafter, this invention will be explained in detail along with examples.

FIG. 1 shows a pair of segments joined by the segment joining method according to claim 1 of the present invention. The difference between the joint structure shown in Fig. 1 and the joint structure shown in Fig. 5 is that the joint end face 2 of one segment 1°
As shown in FIG. 3, an annular convex portion 10 is provided around the periphery of the bolt insertion hole 6, and a groove portion 11 that fits into the convex portion 10 is provided on the joint end surface 2 of the other segment l. By the way. Other identical parts are given the same reference numerals and their explanations will be omitted.

The convex portion IO formed around the periphery of the bolt insertion hole 6 is connected to the bolt insertion hole 6.6 of the pair of segments 1 and B to be joined.
It is formed for positioning when connecting the bolts, and can be made longer by protruding the holding length of the fastening bolt 7, which is previously inserted into one bolt insertion hole 6 and held. This is to protect the fastening bolt 7. By providing the convex portion lO around the periphery of the bolt insertion hole 6 in this manner, the bolt insertion holes 6.6 between the segments 111 can be communicated more easily.

A pair of segments with such a joint structure! , Bi by the joining method according to claim 1 of the present invention,
First, a segment I'' is prepared in which a convex portion 10 is formed on the joint end surface 2 and a fastening bolt 7 is inserted into a bolt insertion hole 6.

In order to insert and hold the fastening bolt 7 into the bolt insertion hole 6, the fastening bolt 7 is loosely fitted into the bolt insertion hole 6, and one end of the fastening bolt 7 where the threaded portion is provided faces the joint end surface 2 side. It is possible to use a method of manufacturing segmented concrete by pouring concrete in such a way that it is facing the same direction. Here, the fastening bolt 7 may be a single-threaded bolt with a threaded portion at one end, or a bolt as shown in FIG. A screw portion may be provided at both ends.

Next, prepare a segment l in which a groove 11 matching the shape of the convex part IO formed on the joint end surface 2 is formed, and prepare a segment l' in which the fastening bolt 7 is inserted into the bolt insertion hole 6 in advance; They are aligned vertically so that their joint end surfaces 2.2 are aligned and their respective bolt insertion holes 6.6 communicate with each other. At this time, be careful not to damage the fastening bolt 7 that has been inserted into the bolt insertion hole 6 in advance.
Pull the fastening bolt 7 inside so that it does not protrude from the protrusion 10 (.

After the bolt insertion holes 6.6 are connected, the fastening bolt 7 is moved so that both ends of the fastening bolt 7 are stored in the recesses 3.3, and the ends of the fastening bolt 7 stored in the recesses 3. A washer 8 and a nut 9 are sequentially inserted into the section and screwed together to join the pair of segments 11.

In this joining method, the fastening bolt 7 is inserted into the bolt insertion hole 6 in advance when driving the segment, and then the joining end face 2.2 is fitted together. Therefore, even if the fastening bolt 7 is very long, the segment 1. Via can be easily joined.

Further, the fastening bolt 7 is inserted in advance into the bolt insertion hole 6 of one segment I'', and the fastening bolt 7 is inserted into the bolt insertion hole 6 of one segment I''. Since it is inserted into the bolt insertion hole 6 of the other segment l after positioning [', it is not necessary to enlarge the recess 3 even if the thickness of the joint flange 5 is increased, and sufficient joint strength can be obtained. .

Furthermore, a convex portion IO and a groove portion 1 are provided on the joint flange 5.5, respectively.
1, it becomes very easy to align the segments 11 when making the bolt insertion holes 6 communicate with each other.

FIG. 2 shows an embodiment of a concrete segment joint structure according to claim 2 of the present invention. Second
The difference between the joint structure shown in the figure and the conventional one shown in FIG.
is formed, and the embedded washer 13 is attached within this recess 12.

The recess (2) is formed by enlarging the diameter of one end of the bolt insertion hole 6 on the recess 3 side. The inner surface of this recess 12 has a recess 12
An embedded washer 13 is disposed which covers the segment 1° and partially embeds it inside the segment 1°. The embedded washer 13 is a cylindrical body with a bottom, and an opening 4 communicating with the bolt insertion hole 6 is formed at the bottom thereof. Then, the fastening bolt 7 is inserted into the bolt insertion hole 6 through this opening 14.
is inserted.

In such a joint structure, in order to insert the fastening bolt 7 into the bolt insertion hole 6, the fastening bolt 7 is inserted into the bolt insertion hole 6 in advance when driving the segment 1' in exactly the same manner as the joining method according to claim 1 above. 6 can be used.

With such a joint structure, the length of the fastening bolt 7 can be shortened without reducing the thickness of the joint flange 5. Therefore, similar to the joint structure shown in Figure 1,
Workability during welding can be improved, and there is also an effect that the arm length of the automatic introduction robot used during welding is not limited.

In addition, in the joint structure shown in Fig. 1 and Fig. 2,
In both cases, the fastening bolt 7 is provided with a threaded portion at both ends, but the fastening bolt used in the joining method of the present invention is not limited to these examples, and may be provided with a threaded portion only at one end. Also good.

[Effects of the Invention] As explained above, the concrete segment joining method according to claim I of the present invention provides a joint flange provided between a recess formed adjacent to the joint end surface and the joint end surface. , a method of connecting concrete segments by inserting a fastening bolt into the bolt insertion hole of a pair of concrete segments in which a bolt insertion hole is formed so as to pass through the recess from the joint end surface, and fastening the bolt with a nut. After inserting a fastening bolt in advance into the bolt insertion hole of one concrete segment, the positions of the concrete segments are adjusted so that the bolt insertion holes of both concrete segments communicate with each other, and then the connected bolts are Since the fastening bolt is passed through the insertion hole and then fastened with a nut, workability when joining the segments is good.

Furthermore, the joint structure obtained by the joining method of this invention is
This shows sufficient bonding strength.

Further, in the concrete segment joint structure according to claim 2 of the present invention, a joint flange provided between a recess formed adjacent to the joint end face and the joint end face is provided with a joint structure that penetrates from the joint end face to the recess. Bolt insertion holes are formed in a sliding manner,
The concrete segments are connected to each other by inserting a fastening bolt into the bolt insertion hole and fastening it with a nut. In a concrete segment joint structure, a recess is formed in one concrete segment by enlarging the diameter of the recess side of the bolt insertion hole, and a bottomed cylindrical embedded washer with an opening formed at the bottom is inserted into the recess. Since the concrete segments are joined together by the fastening bolt inserted into the bolt insertion hole through the embedded washer, the fastening bolt can be shortened without reducing the thickness of the joint flange. Therefore, work efficiency can be improved without reducing the joint strength of the segments.

[Brief explanation of drawings]

Fig. 1 is a schematic sectional view showing a joint of concrete segments joined by the joining method described in claim 2 of the present invention, and Fig. 2 shows an embodiment of the joint structure according to claim 2 of this invention. Figure 3 is an enlarged view of the main parts of the bolt insertion hole and convex part of the joint part of the concrete segment shown in Figure 1, and Figures 4 and 5 both show conventional technology. FIG. 4 is a perspective view of the entire segment, and FIG. 5 is a schematic sectional view showing the joined state of the segment. 1.1... Concrete segment, 2... Joint end surface, 3... Recess, 5... Joint flange, 6... Bolt insertion hole, 7... Fastening bolt, 9... Nut , 13...Embedded washer, 14...Opening.

Claims (2)

[Claims] (1) A pair of bolt insertion holes formed in a joint flange provided between recesses formed adjacent to the joint end faces and the joint end faces so as to penetrate from the joint end faces to the recesses. In the method of connecting concrete segments by inserting a fastening bolt into the bolt insertion hole of a concrete segment and fastening it with a nut, after inserting the fastening bolt into the bolt insertion hole of one concrete segment in advance, both The concrete segments are adjusted in position so that the bolt insertion holes of the concrete segments communicate with each other, and then the above-mentioned fastening bolt is passed through the communicated bolt insertion holes, and then the fastening bolt is fastened with a nut. Concrete segment joining method. (2) A bolt insertion hole is formed in the joint flange provided between the recesses formed adjacent to the joint end face and the joint end face so as to penetrate from the joint end face to the recess, and the bolt is inserted through the joint flange. In a concrete segment joint structure in which concrete segments are connected by inserting a fastening bolt into the hole and fastening with a nut, a recess is formed in one of the concrete segments by expanding the diameter of the recess side of the bolt insertion hole. A bottomed cylindrical embedded washer with an opening formed at the bottom is inserted into the recess, and the concrete segments are joined together by a fastening bolt inserted through the bolt insertion hole through the embedded washer. Features concrete segment joint structure.