JPH06294295A - Structure for connecting segment to tie rod - Google Patents

Abstract

PURPOSE:To easily connect a tie rod to a segment by providing a tie-rod supporting portion having an insertion groove, with a space between the supporting portion and the side face of the segment, and fastening to one side of the segment a connection member having an engagement portion in the space for engagement with the end portion of the tie rod. CONSTITUTION:A projecting portion 11 is provided on the side face 10 of a segment 1 to which a tie rod 2 is joined. A tie-rod supporting portion 13 having an insertion groove 14 is attached to the end of the projecting portion 11 with a space 12 between the portion 13 and the side face 10 of the segment 13. A connecting portion 17 to be coupled to the end portion of the tie rod 2 is tightened in the space 12 in such a manner as to be movable toward the side face 10 when tightened. The middle portion of the tie rod 2 is inserted into the insertion groove 14. Next, the end portion of the tie rod is engaged with the engagement portion of the connecting member 17 and brought close to the side face of the segment 1 and tightened thereto. The connecting operation can thus be made very easy without the need for accurately positioning the end of the tie rod 2.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a connecting structure of arcuate plate-shaped segments that are joined together to form an elliptical tunnel wall and tie rods that connect these segments.

[0002]

2. Description of the Related Art In the recent tunnel construction method, while excavating the ground with a shield machine, arc-shaped segments (generally made of reinforced concrete) are sequentially joined behind the ground to construct a cylindrical tunnel wall. The so-called shield construction method has become popular.

In particular, in recent years, it has become necessary to construct a cross-section tunnel having an extremely large inner diameter as compared with the conventional one, such as a tunnel corresponding to a large amount of traffic or a tunnel combining a railway and a roadway. . In order to meet such demands, it has been proposed to make the cross-sectional shape of the tunnel elliptical.

When the tunnel has a horizontally long cross section, the strength against the load in the short axis direction (vertical direction) is weakened. Therefore, tie rods extending in the horizontal direction are provided at the top and bottom of the tunnel as reinforcements. Is being considered. The tie rods are aligned so that both ends thereof are coaxial with the tips of the bolts extending from the fittings provided in advance in the segments, and in this state, the two are brought close to each other via the coupler that is the connecting member. By being tightened, it is set at a predetermined position above and below the tunnel.

[0005]

In the connection structure of the tie rods described above, when one worker tries to perform the connection work on site, while supporting the tie rod with one hand, the tie rod is coaxial with the bolt of the mounting bracket. It is necessary to carry out the work of rotating the coupler with one hand remaining in this state by aligning so as to form a shape, which is a very troublesome work. In particular, when the cross-sectional area of the tunnel is large, the tie rod also becomes large in diameter and length, so that the weight tends to increase, and the connecting work becomes more difficult.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a connecting structure for a segment and a tie rod, which can easily connect the tie rod to the segment.

[0007]

In the present invention, in order to achieve the above object, a tie rod support portion having an insertion groove into which a middle portion of a tie rod is inserted is formed in a segment so that a gap is formed between the segment side surface and the tie rod support portion. A connecting member that is provided and has an engaging portion that engages with the tip portion of the tie rod is fastened to the side surface of the segment so as to be capable of being fastened and moved.

[0008]

Operation: To connect the tie rods, the middle portion of the tie rods is inserted into the insertion groove of the tie rod support portion. Then,
The tip portion of the tie rod is engaged with the engaging portion of the connecting member, and in this state, the connecting member is brought close to the side surface side of the segment and tightened. In the above connection structure, since the tie rod is supported by the tie rod support portion, it is not necessary for the worker to support the tie rod with one hand as described in the conventional example, and the tip of the tie rod is placed at a predetermined position. There is no need for the troublesome work of aligning accurately. Then, in order to apply a tension force to the tie rod, it suffices to tighten and fasten the connecting member with which the tip portion of the tie rod is engaged so as to approach the side surface of the segment, and the connecting work becomes extremely easy.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. 1 is a perspective view showing an essential part of the present invention, FIG. 2 is a transverse sectional view of a tunnel, FIG. 3 is a front view of an essential part of the tunnel, and FIG. 4 is a sectional view taken along line XX of FIG. As shown in FIG. 2, the tunnel according to this embodiment has a cross-sectional shape of a horizontally elongated elliptical shape by joining the joints 1 made of precast concrete to each other by joining their joining end faces to each other and joining them in the circumferential direction and the axial direction. It is configured to be.

Since the tunnel is formed in an elliptical shape in cross section, it is weak in strength against a load in the vertical direction and, for the purpose of reinforcing it, the thickness of the segment 1 arranged above and below is set to be thick and the upper and lower parts are horizontally oriented. A tie rod 2 made of steel is provided so as to extend to.

The connecting structure between the segment 1 and the tie rod 2 will be described by taking the tie rod arranged above the tunnel as an example. As shown in FIGS. 1 and 4, the side surface 10 of the segment 1 to which the tie rod 2 is joined is described. A protrusion 11 is formed in the lower portion, and a comb-shaped tie rod support portion 13 having a plurality of insertion grooves 14 on the upper side is formed on the upper surface of the tip of the protrusion 11 so as to leave a gap 12 between the side surface 10 of the segment. Provided and attached. The tie rod support portion 13 has a plurality of insertion grooves 14 formed by cutting one side of a rectangular steel plate at predetermined intervals along the length direction, and the tie rods are formed in the insertion groove 14. The middle part of 2 is inserted and supported.

Although the insertion groove 14 is cut out in a rectangular shape in the illustrated example, it is not necessarily cut out in a rectangular shape and may be cut out so as to have a semicircular bottom portion. It may be cut out in a tapered shape so that the upper portion expands. The width of the insertion groove 14 is set to a value slightly larger than the outer diameter of the tie rod 2, so that the tie rod 2 can freely move within the insertion groove 14. In FIG. 4, reference numeral 15 indicates an anchor portion of the tie rod support portion.

In the gap 12 between the side surface 10 of the segment and the tie rod support portion 11, there is provided a connecting member 17 which engages with the tip portion of the tie rod, and the connecting member 17 is tightened on the side surface 10 side of the segment. Attached so that it can be moved.

As shown in FIG. 1, the connecting member 17 is formed with a plurality of engaging grooves 18 which open downward and are arranged at predetermined intervals.
It has a shape that is upside down. The engagement groove 18 is set to a value slightly larger than the outer diameter of the tie rod 2 and smaller than the outer diameter of the large diameter portion 19 so that it can be engaged with the large diameter portion 2a provided at the tip of the tie rod 2. .

A plurality of upper and lower bolt insertion holes 20 are formed in the connecting member 17 in the middle of the engaging grooves 18. Bolts 21 are inserted into these bolt insertion holes 20 with their heads 21a engaged, and by tightening the bolts 21, the tie rods 2 are brought closer to the side surface 10 side so as to give a predetermined tension force. Have been concluded. Reference numeral 23 is an insert fitting to which the tip of the bolt 21 is screwed, and 24 is a tie rod support portion 13.
It is a hole for inserting a fastening tool provided in the. The above-mentioned connecting structure of the segment and the tie rod has been described only on one side of the tie rod 2, but the connecting structure of the other one of the tie rods is also the same as that described above, and the description thereof is omitted here.

Next, a procedure for constructing the connecting structure of the segments and the tie rods will be described. Lift the tie rod 2 to be set, and in advance, the protrusion 1 of the segment 1.
Insertion groove 1 of tie rod support 13 attached to the tip of 1
4 is positioned right above, and in this state, it is lowered to fit the tie rod 2 into the insertion groove 14. The above work is performed for each of the plurality of tie rods 2. When these operations are completed, the connecting member 17 is then lifted to lift the side surface of the segment 1 and the tie rod support portion 13.
And the engaging groove 18 directed downward.
Are positioned so that they are directly above the tie rods 2, and then the connecting member 17 is lowered to fit the tie rods 2 into the engagement grooves 18.

Next, the connecting member 17 is moved to the side surface 10 side of the segment, so that the tie rod 2 is inserted into the engaging groove 18.
Of the bolt 21 inserted into the bolt insertion hole 20 in this state by engaging the tip large diameter portion 2a of the insert metal fitting 23
Tighten firmly by screwing. As a result, the connecting member 17 can be moved to the side surface 10 side of the segment to apply a predetermined tension to the tie rod 2.

With such a connecting structure, a tension force is applied to the tie rod 2 while being supported by the tie rod support portion 13. Therefore, as described in the conventional example, an operator supports the tie rod with one hand. This eliminates the need for work, and also eliminates the troublesome work of accurately aligning the tip end of the tie rod 2 with a predetermined position as in the case of coupling using a coupler. Then, an operator can apply a predetermined tension to the tie rod 2 to connect the tie rod 2 to the segment 1 by a simple work of tightening the bolt 21 inserted into the bolt connecting member 17. In addition, the tie rods 2 are independently segment 1
Connecting member 17 which is a common member, not connected to
Since it is a structure that is connected to the segment 1 via the, it is possible to uniformly apply tension to the plurality of tie rods 2, and it is possible to provide a connection structure with good balance and excellent strength.

In the above embodiment, the example in which the present invention is applied to the connecting structure of the tie rods arranged in the upper part of the tunnel has been described, but the present invention is not limited to this, and the present invention is arranged in the lower part of the tunnel. The same applies to the tie rod connection structure. In this case, the tie rod support 1
3 is arranged with the opening of the tie rod insertion groove facing the side. Further, in the above embodiment, the case where the precast concrete segment 1 and the tided 2 are connected has been described as an example, but the present invention is not limited to this, and when the steel segment is connected to the tie rod 2. But of course it is applicable.

[0020]

As described above, according to the present invention, the tie rod support portion having the insertion groove into which the intermediate portion of the tie rod is inserted is provided in the segment with a gap between the tie rod support portion and the side surface of the segment. In the conventional example, the tie rod is supported by the tie rod support portion because the connecting member having the engaging portion that engages with the tip portion of the tie rod is fastened to the side surface of the segment in the gap so that the tie rod can be moved. As explained, the worker does not need to support the tie rod with one hand, and the troublesome work of accurately aligning the tip of the tie rod to a predetermined position is no longer necessary. In order to give, it is only necessary to tighten and tighten the connecting member that engages the tip of the tie rod so that it approaches the side surface of the segment,
The connection work becomes extremely easy.

[Brief description of drawings]

FIG. 1 is a perspective view of an essential part for explaining an embodiment of the present invention.

FIG. 2 is a sectional view of a tunnel to which the present invention is applied.

FIG. 3 is a front view of a side surface of a segment.

4 is a sectional view taken along line XX of FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 segment 2 tie rod 10 side surface of segment 11 protruding portion 12 gap between side surface of segment and tie rod support portion 13 tie rod support portion 17 connecting member 18 engaging groove 20 bolt insertion hole 21 bolt 23 insert metal fitting

Claims (1)

[Claims] 1. A tie rod support portion having an insertion groove into which an intermediate portion of the tie rod is inserted is provided in the segment with a gap between the segment and a side surface of the segment, and the tip portion of the tie rod is engaged with the gap. A connecting structure of a segment and a tie rod, wherein a connecting member having an engaging portion is fastened to a side surface of the segment so as to be able to be fastened and moved.