JPH10169387A - Long bolt type composite segment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the weak points of impervious function, deformation, and strength of joints connecting segments. SOLUTION: Lining steel plates are attached to the bottom of a steel frame constituted of a main girder extending in the right angled direction against a tunnel axis, joint plates 2 attached to both ends, and a plurality of ribs provided at every specified distance in the right angled direction against the main girder, in the segment. Holes to insert long bolts in the right angled direction against the tunnel axis are made in the joint plates and the ribs of steel frames and short bolt holes for the joints are made in the axial direction of the tunnel. Holes 8 inserting connecting long bolts in the right angled direction of the tunnel axis, additional holes 9 for the long bolts, boxes 10 for fastening the long bolts, and boxes 11 for fastening the connection bolts in the tunnel axis are provided in the inside of the frame and concrete is placed. The rigidity of the joint can be further increased by giving a prestress to the long bolts.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a segment for lining a shield tunnel, and more particularly to a long bolt type composite segment in which a steel shell structure is filled with concrete and a connection portion of each segment is fastened with a long bolt.

[0002]

2. Description of the Related Art Conventionally, this kind of segment has a so-called joint structure in which a joint plate 21 of both segments 20 is fastened by a connecting bolt 22 on a joint surface 20a of the segment 20 to be joined. Bolted joint structures are generally known. FIG. 5 is a view showing a joint structure of a conventional steel segment.

However, transmission of bending and tensile stress in such a conventional joint structure is performed through the joint plate 21. Therefore, in such a conventional joint structure, stress concentrates on the joint plate 21 and the joint plate 21 is deformed. FIG. 6 is a diagram showing a deformed state when a bending moment is applied, and FIG. 7 is a diagram showing a deformed state when a tensile force is applied.

[0004] When the joint plate 21 is deformed in this way, it is impossible to bring the connecting surfaces 20a of the two segments 20 into contact with no gap in connecting the two segments 20 to be connected. Therefore, there is a possibility that the function as a member for tunnel lining, that is, water blocking of the shield tunnel formed of each segment to be connected and maintenance of the shape as a lining plate may not be achieved.

[0005] Further, as a method of constructing a large-section tunnel efficiently and economically, the applicant has constructed a plurality of small-section shield tunnels a close to each other and joined the small-section shield tunnels a to each other. A method of constructing the large-section tunnel A by laying out the concrete of the large-section tunnel A and then excavating the inside of the large-section tunnel A constituted by the small-section shield tunnel a by a conventional method. Was developed.

FIG. 8 is a process diagram of constructing a small-section shield tunnel in close proximity, and thereafter constructing a large-section tunnel. FIG. 8A is a view in which a small-section tunnel a is constructed in close proximity, and FIG. () Is a view in which small-section tunnels a constructed in (a) are connected to each other, and a concrete body is cast.
(C) is a figure which constructs the large-section tunnel A by digging the internal soil of the large-section tunnel A after placing concrete in (b).

[0007] In this case, after excavation of the inside of the large-section tunnel A, the lining material of the small-section tunnel a is changed to the large-section tunnel A.
Will function as a structural member.

Therefore, in order for the composite segment to function as a tension member of the large-section tunnel A, it is required that the rigidity and strength of the connecting portion between the segments be large and that the composite segment be integrated with the concrete. Will be done.

The present invention has been made in view of such circumstances, and each of the composite segments serving as lining segments is
Provided is a long-bolt composite segment in which the strength and rigidity of a joint portion are increased and segments can be easily and reliably connected.

[0010]

SUMMARY OF THE INVENTION A primary lining segment for a shield tunnel is provided. The segment includes a main girder passing in a direction perpendicular to the tunnel axis, joint plates attached to both ends, and a direction perpendicular to the main girder. A steel plate serving as a lining plate is attached to the bottom of a steel frame composed of a plurality of ribs provided at predetermined intervals, and the joint plate and the rib of the steel frame are perpendicular to the tunnel axis. A hole for inserting a long bolt in the direction, a short bolt hole for a joint in the tunnel axis direction, and a hole for inserting a long bolt for connection in a direction perpendicular to the tunnel axis inside the frame. A long bolt type synthetic segment characterized by being provided with a retaining hole for the long bolt, a box for fastening the long bolt, and a box for fastening the connection bolt in the tunnel axial direction, and being filled with concrete. And

Next, the operation of the present invention will be described.

Since the long bolts are used, stress is not concentrated on the joint plate as compared with the conventional short bolt joint, and the stress is applied via the member from the joint plate to the bolt head or the nut of the long bolt. Is transmitted, so that the stress is dispersed at the joint portion and does not cause local deformation of the joint plate.

In particular, the outer periphery is constructed with a small-section tunnel,
When used as a body of a large-section tunnel where a large external force acts, such as a large-section tunnel, a rib in a direction perpendicular to the main girder resists shearing force and contributes to the integration of the segments. Since it is a composite structure in which a steel frame is filled with concrete, the rigidity of the joint is extremely high with respect to bending moment and tensile force.

Further, by applying a predetermined tightening force to the long bolt, a prestress is applied to the joint portion, and the rigidity of the joint portion can be increased.

[0015]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a perspective view showing the entire structure of the long bolt type synthetic segment of the present invention, FIG. 2 is a top view of the long bolt type synthetic segment, and FIG. 3 is a sectional view taken along line AA of FIG. It is.

A main girder 1 is passed in a direction perpendicular to the tunnel axis, and joint plates 2 are welded to both end faces. Further, the ribs 3 are welded in the axial direction of the tunnel at predetermined intervals in a direction perpendicular to the main girder, and a steel plate 4 serving as a lining plate is welded to the bottom of the frame thus formed.

A hole 5 for inserting a long bolt is formed in the joint plate 2 and the rib 3 in advance. Further, bolt holes 6 for fastening bolts in the tunnel axial direction are formed in the main girders 1 at both ends.

In FIG. 2, a cap nut 7 is welded to the main girder 1 on one side for bolting in the axial direction of the tunnel, and the bolt is tightened up from the opposite side.

In FIG. 2, the direction perpendicular to the tunnel axis is divided into eight parts by the ribs 3. However, it is needless to say that the rib is not necessarily divided into eight parts. I just need.

A hole 8 for inserting a long bolt, a bolt holding hole 9 for inserting the long bolt, and two bolts for inserting the long bolt are inserted into the space thus partitioned. A long bolt-type composite segment is formed by filling concrete 12 provided with a bolt box 10 for connecting segments and a bolt box 11 for fastening bolts in the tunnel axial direction.

FIG. 4 is a view showing an example of a development view of the inside of a tunnel incorporating a long bolt type composite segment.

[0023]

The effects of the present invention are as follows.

Since the long bolts are used, the stress is not concentrated on the joint plate as compared with the conventional short bolt joint, and the stress is applied via the member from the joint plate to the bolt head or the nut of the long bolt. Is transmitted, so that the stress is dispersed at the joint portion and does not cause local deformation of the joint plate.

In particular, the outer periphery is constructed with a tunnel having a small section,
When used as a body of a large-section tunnel where a large external force acts, such as a large-section tunnel, a rib in a direction perpendicular to the main girder resists shearing force and contributes to the integration of the segments. Since it is a composite structure in which a steel frame is filled with concrete, the rigidity of the joint is extremely high with respect to bending moment and tensile force.

Further, by applying a predetermined tightening force to the long bolt, a prestress is applied to the joint portion, and the rigidity of the joint portion can be increased.

[Brief description of the drawings]

FIG. 1 is a perspective view showing the overall configuration of a long bolt type composite segment of the present invention.

FIG. 2 is a top view of a long bolt type composite segment.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a diagram showing an example of a development view of the inside of a tunnel incorporating a long bolt type synthetic segment.

FIG. 5 is a view showing a joint structure of a conventional steel segment.

FIG. 6 is a diagram showing a deformed state when a bending moment acts on a conventional segment structure.

FIG. 7 is a diagram showing a deformed state when a tensile force acts on a conventional segment structure.

[Fig. 8] A small section shield tunnel is built close to
It is a process diagram of constructing a tunnel with a large section thereafter.
(A) is a diagram in which small-section tunnels a are constructed close to each other, and (b) is a diagram in which the small-section tunnels a constructed in (a) are connected to each other and concrete is cast.
(C) is a figure which constructs the large-section tunnel A by digging the internal soil of the large-section tunnel A after placing concrete in (b).

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Main girder, 2 ... Joint plate, 3 ... Rib, 4 ... Steel plate to be lining plate, 5 ... Hole for inserting long bolt, 6 ... Bolt for fastening bolt in tunnel axis direction Hole 7: Cap nut, 8: Hole for inserting long bolt, 9: Bolt retaining hole, 10: Bolt box, 11: Bolt box, 12: Concrete 20: Segment, 20a: Connection Surface, 21: Joint plate, 22: Connection bolt a: Small-section shield tunnel, A: Large-section tunnel, A: Joint between small-section tunnels

Claims (1)

[Claims] 1. A primary lining segment for a shield tunnel, the segment comprising a main girder passing in a direction perpendicular to the tunnel axis, a joint plate attached to both ends, and a predetermined spacing in a direction perpendicular to the main girder. A steel plate serving as a lining plate is attached to the bottom of a steel frame consisting of a plurality of ribs provided by opening, and a long bolt is attached to the joint plate and the rib of the steel frame in a direction perpendicular to the tunnel axis. A short bolt hole for a joint in the axial direction of the tunnel, a hole for inserting a long bolt for connection in a direction perpendicular to the tunnel axis inside the frame, and the long bolt. A long bolt type synthetic segment characterized by being provided with a retaining hole for use, a box for fastening a long bolt, and a box for fastening a connecting bolt in the tunnel axial direction, and filled with concrete.