JPH0734786A - Joint structure of segment for use in lining - Google Patents

Abstract

PURPOSE:To facilitate construction work and improve water-sealing in tunnel construction in the case of great depth, large section or underground river, or in tunnel construction at a sharp curve. CONSTITUTION:A loosening prevention element 11 is secured to the head of a bolt 6 for use in an ordinary segment joint plate. The element 11 has a U-shaped section 12 on one end of a steel bar, whereby joint plates 4 are clamped by the section 12 and segments are joined together by tightening the bolt 6 with loosening prevention element 11 which is inserted into a bolt hole 5 of the plate 4 and a nut 7. By bringing a slippage prevention protrusion 13 inside the section 12 of the element 11 into engagement with a slippage prevention recess 14 of the plate 4, the location of the section 12 is fixed, thereby preventing slippage thereof.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a joint structure for a lining segment used in a shield construction method or the like.

[0002]

2. Description of the Related Art In a tunnel, a common groove, etc., as shown in FIG. 4, a plurality of arc-shaped segments 1 are circumferentially connected to form a circular tube, and a plurality of them are axially connected to form a tunnel. To be done.

The segment 1 is a steel segment,
In addition to reinforced concrete segments, composite segments having a composite structure of steel plate and concrete (for example, Japanese Patent Laid-Open No.
1-286497, JP-A-3-59300, JP-A-3-286097, etc.) and the like,
In each case, a joint (a segment joint 2 in the circumferential direction and an inter-ring joint 3 in the axial direction) for connecting the adjacent segments 1 is provided, and a sealing material for stopping water is interposed on the joint surface of the segment 1. is doing.

By the way, as a conventional joint of steel segment, reinforced concrete segment, and composite segment, as shown in FIG. 5, a bolt hole 5 is provided in a joint plate 4, a bolt 6 is inserted therein, and a nut 7 is tightened to make the segment. It is common to connect one to the other.

Further, in a sharp curve tunnel or the like, a clip type tightening metal fitting 8 as shown in FIG. There is one in which the joint plate 4 is sandwiched by hitting with.

[0006]

When constructing a tunnel in an urban area or the like, there is a tendency for a large depth, a large section, and a sharp curve.

In addition, as a recent trend in particular, there is an increasing need for constructing underground rivers with shield tunnels.

In the case of large depth, large cross section and underground river, high water pressure acts on the tunnel. Conventionally, the waterproof property is secured by providing a seal groove on the segment joint surface and installing a sealing material, but it is difficult to secure the excellent waterproof property under these conditions.

Further, when the shield machine excavates a steep curve portion of the tunnel, the jerk thrust is applied to a part of the segment ring to adjust the excavation direction of the shield machine. For this reason, an eccentric moment acts on the segment ring, which may cause a gap in the joint surface between the rings of the segment.

In this case, since there is a concern that groundwater may leak from the openings, it is the current situation to install opening prevention fittings depending on the situation in order to secure water stoppage. However, the above-described conventional fastening member 8 of FIG. 6 may come off after installation, which is dangerous and requires a considerable amount of labor for its installation.

The present invention is intended for tunnel construction for large depths, large cross-sections, underground rivers, or tunnel construction of steep curves, and is a joint for a lining segment that is easy to construct and has excellent waterproofness. It is intended to provide a structure.

[0012]

SUMMARY OF THE INVENTION The present invention provides a joint structure for a conventional lining segment in which joint plates of adjacent segments are fastened together with bolts and nuts that pass through bolt holes of the joint plates. Hook-shaped U that sandwiches each other
An opening prevention metal fitting with a mold is provided integrally with the bolt or nut to enable jointing of segments by tightening bolts and nuts, and prevention of opening by sandwiching the joint plate by the U-shape at the same time. It is a thing.

In addition, when the U-shaped portion of the opening prevention fitting and the joint plate sandwiched inside the U-shaped portion are provided with protrusions and recesses for engaging with each other to prevent slippage, when tightening bolts and nuts, When high water pressure acts on the assembled segment ring, it is possible to prevent the opening prevention fitting from shifting.

[0014]

In the joint structure of the present invention, at the same time as tightening the bolts and nuts, the joint plate is sandwiched between the U-shaped portions of the opening preventive metal fittings to improve the adhesion of the joint plate, and high water pressure acts on the segment ring. In this case, it is possible to prevent the opening of the joint plate at the position of the joint plate when an eccentric moment acts, and to secure high water shutoff.

Further, since the opening prevention fitting is integrated with the bolt or the nut, there is no fear that only the opening prevention fitting will come off.

[0016]

EXAMPLES Next, the illustrated examples will be described.

FIG. 1 and FIG. 2 show an embodiment in which a bolt 6 is provided with an opening prevention fitting 11 as one embodiment of the present invention.

In the present embodiment, the opening preventing fitting 11 is attached to the head of the bolt 6 for a normal segment joint plate.

The opening preventive metal fitting 11 is formed by forming a U-shaped portion 12 at one end of a steel rod. As shown in FIG. 1, a bolt 6 with the opening preventive metal fitting 11 is inserted through the bolt holes 5 between the joint plates 4. The segments are joined together by tightening the nut 7 and the nut 7, and the U-shaped portion 12 of the opening prevention fitting 11 is joined.
Thus, the joint plates 4 have a structure in which the inner ends of the segment rings are sandwiched.

As a construction method in this case, generally, the bolts 6 are inserted into the bolt holes 5 so that the joint plates 4 are sandwiched by the U-shaped portions 12, and the nuts 7 are tightened mainly by rotation.

Further, in this embodiment, a deviation preventing projection 13 is provided inside the U-shaped portion 12 of the opening prevention fitting 11, and on the other hand, the joint plate 4 is engaged with the deviation preventing projection 13 and is displaced. A stopper recess 14 is provided so that the position of the U-shaped portion 12 when the joint plate 4 is sandwiched is fixed so as not to shift.

The shift-preventing projection 13 and the shift-preventing recess 14
The relationship of the concavities and convexities may be reversed, and it is also possible to provide the joint plate 4 with a deviation preventing projection and the U-shaped portion 12 with a deviation preventing recess.

FIG. 3 shows another embodiment of the present invention in which the opening preventing fitting 11 is integrated with the nut 7.

In this embodiment, the opening preventing fitting 11 is attached by welding in the direction perpendicular to the axis of the nut 7 for a normal segment joint.

The basic structure of the opening prevention fitting 11 is similar to that of the embodiment shown in FIGS. 1 and 2, and in this embodiment, two nut opening prevention fittings 11 are welded to one nut 7. Further, a deviation preventing projection 13 is provided inside the U-shaped portion 12 of the opening prevention fitting 11 to prevent deviation from the joint plate 4. As in the case of the embodiment of FIGS. 1 and 2, it is possible to provide the U-shaped portion 12 with a shift preventing recess.

As a construction method in this case, generally, the nut 7 is held in the bolt hole 5 position by sandwiching the joint plates 4 by the U-shaped portion 12, and the bolt 6 passed through the bolt hole 5 is tightened by rotation. go.

[0027]

[Effects of the Invention] At the same time as tightening the bolts and nuts, the joint plate is sandwiched between the U-shaped portions of the opening preventive metal fittings to improve the adhesion of the joint plate. It is possible to prevent the opening at the joint plate position when it acts and to secure high water shutoff.

Since the opening prevention fitting is integrated with the bolt or the nut, there is no fear that only the opening prevention fitting will come off.

As compared with the case where the opening prevention fitting is a separate part, the number of parts is reduced, which facilitates management and field work.

Since it can be integrated with a conventional bolt or nut by welding or the like, it can be easily and inexpensively manufactured.

[Brief description of drawings]

FIG. 1 is a front view of a joined state according to an embodiment of the present invention viewed from the inside of a segment ring.

FIG. 2 is a plan view of a bolt provided with an opening prevention fitting according to the present invention.

FIG. 3 is a perspective view of a nut provided with an opening prevention fitting according to the present invention.

FIG. 4 is a perspective view of a general lining segment ring.

FIG. 5 is a cross-sectional view showing a conventional general joint structure.

FIG. 6 is a perspective view showing an example of a conventional clip-type tightening fitting.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Segment, 2 ... Segment joint, 3 ... Ring joint, 4 ... Joint plate, 5 ... Bolt hole, 6 ... Bolt, 7 ... Nut, 8 ... Tightening metal fitting, 9 ... Washer, 11 ... Opening prevention metal fitting, 12 ... U-shaped portion, 13 ... Misalignment projection, 14 ... Misalignment recess

Claims (2)

[Claims] 1. In a joint structure of a lining segment, which is formed by fastening joint plates of adjacent segments with bolts and nuts passed through bolt holes of the joint plates, a U-shaped portion for sandwiching the joint plates is formed. A joint structure for a lining segment, characterized in that an opening prevention fitting is provided integrally with the bolt or nut. 2. The lining segment according to claim 1, wherein the U-shaped portion of the opening prevention metal fitting is provided with recesses and projections for engaging with each other at a contact position between the U-shaped portion and a joint plate sandwiched inside thereof. Joint structure.