JPH0810604Y2 - Concrete segment joint structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a joint structure for a concrete segment used when constructing a railway tunnel, an underpass, or the like.

[Prior Art] Conventionally, a concrete segment is usually formed in an arc plate shape. By aligning both end faces and both side faces with side faces of adjacent segments, and fastening them with bolts to join them, It is used as a concrete structure that forms the inner wall of tunnels and underpasses.

As one means for joining these concrete segments, at the position facing the joint end surface of each concrete segment, a recess in which a joint box is embedded is formed,
There is a method of linearly penetrating the joint end face to insert an insertion hole connecting these joint boxes, inserting a bolt into the insertion hole, and fastening both ends of the joint box in the joint box. Has been adopted.

[Problems to be Solved by the Invention] By the way, in such a joint structure of concrete segments, one bolt is arranged between two joint boxes. That is, when attempting to join each concrete segment with sufficient joining strength, the number of recesses is twice as many as the number of bolts required for that, and
This is a calculation in which a joint box must be embedded in each one.

By the way, in recent years, construction of concrete segments without secondary lining has been carried out, and when a large number of recesses are formed as described above, it is extremely difficult to embed a joint box in each of these recesses. Takes time,
There was a problem that the work efficiency of the construction work was significantly reduced.

Further, the formation of the recess and the embedding of the joint box cause many defects in the main body of the concrete segment, which also causes a decrease in rigidity of the concrete segment. Therefore, downsizing of the joint box has been demanded so far, but there is a limit to the miniaturization because bolts are tightened in the joint box, and it is necessary to reduce the defective portion. Was difficult.

The present invention has been made in view of the above circumstances,
An object of the present invention is to provide a joint structure for a concrete segment that reduces the number of joint boxes to enhance the rigidity of the concrete segment and allows a large number of bolts to be inserted to achieve joints with high joint strength.

[Means for Solving the Problems] The present invention provides a recess in which a joint box is embedded at a position facing each joint end surface of concrete segments to be jointed to each other, and these joints are penetrated through the joint end surface. The insertion holes that connect the boxes for operation are formed in an annular shape having a diameter at least between the boxes for the joints, and two bending bolts that are curved in a semi-circular shape are provided in the insertion hole of the annular shape. With the curved inner surfaces of the
A solution means is that the joint end faces are respectively inserted and inserted, and both end portions of these bending bolts are respectively fastened in the joint box.

[Operation] According to the joint structure of the concrete segment of the present invention, an annular insertion hole that connects between a pair of joint boxes is provided, and a semi-circular bent bolt is inserted into the insertion hole. Since both ends of these bent bolts are fastened in the joint box, the number of bolts can be reduced by half without reducing the number of bolts compared to the conventional joint structure. Can be reduced.

[Embodiment] Hereinafter, the joint structure of the concrete segment of the present invention will be described with reference to FIGS. 1 to 3 showing an embodiment.

In these figures, the concrete segment is designated by 1. A concrete segment (hereinafter, simply referred to as a segment) 1 is formed by bending a rectangular plate body in an arc plate shape in its longitudinal direction, and both end faces of each segment (piece P). The substantially circular tubular concrete ring (hereinafter simply referred to as ring) R is configured by joining 1a and 1a together with the end faces 1a and 1a of the adjacent pieces P and P, respectively. In addition, the ring R thus formed is joined in a state in which both side surfaces 1b, 1b are combined with the side surfaces 1b, 1b of the adjacent rings R, R, respectively,
The desired concrete structure is constructed.

In such a concrete structure, as shown in FIG. 1, inside each segment 1, a concave portion for a joint is formed at a desired position on the side surfaces 1b, 1b which are the joint end surfaces S between the respective rings R, R. Location 2 is formed. The recess 2 has a box shape with a substantially trapezoidal cross section, and is provided in a state where the smaller area 2a of the two bottom surface portions 2a, 2b faces the joint end surface S. In addition, a joint box 3 for protecting the inner wall surface and performing bolting work described later is embedded in the recess 2 along the inner wall surface of the recess 2.

An insertion hole that penetrates the joint end surface S and connects the joint boxes 3 and 3 between the pair of joint boxes 3 and 3 provided on the segments 1 and 1 on both sides of the joint end surface S. Four
Is provided. The insertion hole 4 is formed in an annular shape having two joint boxes 3 and 3 at both ends in the diametrical direction, and is provided so as to communicate with the side surfaces of the joint boxes 3 and 3. .

The bolts 5, 5 are inserted in the insertion hole 4. The bolt 5 is a bent bolt that is curved and formed in a semi-arcuate shape in accordance with the curvature of the insertion hole 4, and the two bolts are respectively inserted through the joint end surface S in a state where their curved inner surfaces face each other. There is. And these bent bolts
Both ends of 5,5 are inserted into the joint boxes 3,3, respectively, and nuts are provided on the side surfaces of the joint boxes 3,3.
It is concluded with 6,6. By this, each ring R, R is
The side faces 1b and 1b are joined together firmly.

Further, even in each of the rings R, a recess 2 having a joint box 3 embedded therein is provided at a desired position on the end surface 1a which is the joint end surface T between the individual segments (pieces P). An annular insertion hole 4 is provided so that the joint boxes 3 and 3 serve as both ends in the diametrical direction. Then, the semi-circular bending bolts 5, 5 similar to those described above are inserted into the insertion holes 4, and both ends thereof are nut-tightened in the joint boxes 3 and 3, whereby each piece P , P are firmly joined to each other with their end faces 1a, 1a aligned.

Next, a method of obtaining the joint structure of the concrete segment of the present embodiment will be described with reference to FIGS. 2 and 3. 2 and 3 show a method of joining the rings R and R formed of the segment 1 in the order of steps.

First, the side surface 1b inside the segment 1 to be the joint end surface S
At the desired positions, the recesses 2 in which the joint boxes 3 are embedded are formed, and the annular insertion holes 4 are provided so that these joint boxes 3 serve as diametrically opposite ends.

Then, as shown in FIG. 2, the semicircular arc-shaped bending bolt 5 is inserted into the insertion holes 4 provided in each segment 1 and is left completely immersed in the insertion holes 4.

In this state, as shown in FIG. 3, both segments 1
Side walls 1b and 1
Match b. And the bent bolts 5,5 inserted earlier
Is moved along the inside of the insertion hole 4 so that the joint end surface S is penetrated.

Then, both ends of these bending bolts 5, 5 are tightened with nuts 6, 6 in the joint boxes 3, 3 to join the segments 1, 1.

As described above, according to the joint structure of the concrete segment of the present embodiment, two joint boxes 3 are provided between the joint end surfaces S and T of the respective segments 1, and two joint boxes are provided between the joint boxes.
Bent bolts 5, 5 of the book are inserted, and the bent bolts 5, 5 join the pieces P, P and the rings R, R. That is, a set of joint boxes 3,
Compared to the conventional joint structure in which one bolt is provided for three, only the number of joint boxes 3 can be reduced to half without reducing the number of bolts 5. Therefore, since a joint strength equal to or higher than the conventional one can be obtained by forming a small number of joint boxes 3, it is possible to reduce the occurrence of a defective portion of the segment 1 due to the formation of the joint bolts 3 The rigidity of can be improved. Further, the work of embedding the joint bolts required in the segment 1 without the secondary lining can be reduced, and the work can be simplified and the labor can be saved.

Moreover, according to the joint structure of the concrete segment of the above-mentioned embodiment, as described above, the bending bolt 5 is inserted into the insertion hole 4 provided in the segment 1 in advance, and the bending bolt 5 is completely immersed in the insertion hole 4. By keeping it in this state, there is no obstructive protrusion when transporting or storing the segment 1, which is very convenient. Further, at the time of joining, since the bending bolt 5 may be moved along the inside of the insertion hole 4, the joining workability is very good.

The joint structure of the concrete segment of the present invention is not limited to the structure shown in the above embodiment, and the concrete structure such as the shape and size of each member can be appropriately changed.

For example, in the above-described embodiment, as shown in FIG. 1, for each piece P, P and each ring R, R, two bending bolts 5, 5 are provided for one set of joint boxes 3, 3. Although an example in which 5 is provided and joined by this is shown, other than this, as shown in FIG. 4, for example, between each piece P, P is 2 for one set of joint boxes 3, 3. It is also possible to provide bending bolts 5 and 5 and a linear bolt 7 and to join them.

In the joint structure of the concrete segment of this embodiment, the joint end surface T is provided between the pair of joint boxes 3, 3.
Through an insertion hole 4 having an annular shape such that these joint boxes 3, 3 serve as diametrically opposite ends, and a straight line between the two joint boxes 3, 3 penetrating the joint end surface T. And an insertion hole 8 extending in a circular shape. Two semi-circular bent bolts 5, 5 similar to those in the above-described embodiment are inserted in the annular insertion hole 4, and a linear bolt 7 is inserted in the linear insertion hole 8. Has been done. Then, by tightening both ends of these three bolts 5, 5, 7 with nuts 6, 6, 9 in the joint boxes 3, 3, respectively, both pieces P, P
Are joined.

According to this embodiment, three bolts are provided between the pieces P, P.
Since it is fastened with 5, 5 and 7 and joined, higher joining strength can be obtained. Moreover, since the number of the joint boxes 3 does not change, the rigidity of the concrete segment 1 is maintained, and the labor for embedding the joint box 3 is not increased.

[Effects of the Invention] As described above, according to the joint structure of the concrete segment of the present invention, at least two joint boxes are provided between the pair of joint boxes provided at positions where the joint end faces of the concrete segments are sandwiched. Bent bolts are inserted,
This joins each concrete segment. That is, compared to the conventional joint structure in which one straight bolt is provided for one set of joint boxes,
The number of joint boxes can be cut in half without reducing the number of bolts. Therefore, by forming a small number of joint boxes, it is possible to obtain a joint strength equal to or higher than that of the conventional one, so that the occurrence of defective portions of concrete segments due to the formation of joint bolts can be reduced and the rigidity of concrete segments can be reduced. Can be improved. Further, the work of embedding the joint bolts required in the concrete segment without the secondary lining can be reduced, and the work can be simplified and the labor can be saved.

[Brief description of drawings]

1 to 3 show an embodiment of the present invention. FIG. 1 is a sectional view of an essential part showing a joint structure of a concrete segment, and FIGS. 2 and 3 are joint structures of this concrete segment. FIG. 4 is a cross-sectional view showing the procedure for obtaining the same, and FIG. 4 is a cross-sectional view of the essential parts showing another embodiment of the joint structure for the concrete segment of the present invention. 1 ... Concrete segment, 2 ... Recess, 3 ... Joint box, 4 ... Insertion hole, 5 ... Bending bolt, P
...... Piece, R …… Ring, S, T …… Joint end face.

Claims (1)

[Scope of utility model registration request] 1. A recess in which a joint box is embedded is provided at a position facing each joint end face of concrete segments to be jointed to each other, and a through hole for penetrating the joint end face and connecting these joint boxes. The hole is formed in an annular shape having a diameter between at least the joint boxes, and two bending bolts curved in a semi-arcuate shape are arranged in the annular insertion hole so that their curved inner surfaces face each other. A joint structure for a concrete segment, characterized in that each joint is inserted through the joint end face, and both ends of these bending bolts are respectively fastened in the joint box.