JP3117819B2 - Lining method for shield tunnel with rectangular cross section - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for lining a shield tunnel having a rectangular section used as an underground sidewalk, underground road, subway, common ditch, or the like.

[0002]

2. Description of the Related Art Generally, a circular cross section, which is mechanically stable, is often used as a tunnel cross section. However, in a tunnel used as an underground sidewalk, an underground roadway, an underground parking lot network network, a common ditch, etc. From the viewpoint of arbitrarily and occupation width, a rectangular cross section is often more advantageous.

Conventionally, it is difficult to construct such a tunnel having a rectangular cross section by a shield method using segments, and at present, there are few construction examples.

[0004]

When the shield tunnel formed by the segments has a rectangular cross-section, the bending moment generated in the segments increases, and the corresponding member cross-sections and member strengths that are strong against the bending moments, and furthermore, the segments are connected to each other. It is a major issue how to secure the joint strength and the workability of the joint.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned conventional problems, the present invention digs into a desired rectangular section by a rectangular section cutter device of a shield machine, and then cuts the right and left corners at the lower part of the section. An SRC corner segment 1 or 1 formed in an angled cross section from a horizontal portion and a vertical portion is installed, and a flat SRC slab segment 2 is provided between the horizontal portions on mutually facing surfaces. Joint 7, 7 '
And the corner segment 1 and the slab segment 2 are temporarily fixed with joint fittings (bolts and nuts 12, 13 and the like) at their mutually joined ends, and the lower left and right corner segments 1, 1 are joined. The vertical portions of the left and right corner segments 1, 1 at the top of the excavated cross section formed into an angled cross section from the horizontal portion and the vertical portion are placed on the vertical portion of the joint, and joint fittings (bolts and nuts 12, 13), and slab segments 2 are inserted between the horizontal portions of the left and right corner segments 1 and 1 while engaging joints 7 and 7 'such as phased joints provided on mutually facing surfaces. , The corner segment 1 and the slab segment 2 are joined together at their mutually joined ends (bolts and bolts).
Nut 12, 13 etc.), and the H-shaped cross section 9 is provided inside one of the joining ends of the segments.
The joint type steel 8 fitted slidably in the axial direction from the inside to the outside is slid in the outside direction, and the first half thereof is provided at the joint end of the other segment corresponding to the slot 9. After inserting and connecting to the slot 9 ′ of the cross section, a hardening material liquid such as high-strength high-strength cement milk is injected into the slots 9, 9 ′ to solidify and integrate the joint steel 8. It proposes a method of lining a shield tunnel with a rectangular cross section.

[0006]

[Function] The corner segment 1 and the slab segment 2 have an SRC structure that is strong against bending moment, and these are temporarily provided at joint ends thereof by joints 7 and 7 'such as phased joints and joint hardware such as bolts and nuts 12 and 13. The first half of the joint steel 8 fitted into one of the slots 9 provided correspondingly to the joint ends is inserted and fitted into the other slot 9 ′. By injecting a high-strength, high-strength hardening material liquid into 9 'and solidifying and integrating the joint-type steel 8, the lining body has a rectangular cross section that is strong against bending moment without increasing its thickness and weight so much. Segment lining is possible.

Further, the segments can be integrated simply by temporarily moving the joint type steel 8 by sliding the joint steel 8 and injecting the hardening material liquid into the slots after temporarily fixing the joints at the joining ends thereof, so that the workability is good and the joint strength is high. Is obtained.

[0008]

FIG. 4 shows a rectangular segment ring as a lining body.
As shown in the figure, an angle type corner segment 1 disposed at four corners of a rectangular lining section, and upper and lower trapezoidal plate-like slab segments 2 and 2 disposed between horizontal portions of the corner segments 1 and 1 opposed to each other. Assembled from.

In the corner segment 1 and the slab segment 2, as shown in FIG. 5, a plurality of H-section steels 3, 3,... H-shaped steels 3, 3 are stiffeners 4 for joining the upper and lower flange inner surfaces to each other.
And these integrated H-section steels 3, 3
A mesh bar 5 is arranged around the .. and a cavity 6 for reducing the weight is provided in the concrete portion between the H-shaped steels 3.

As shown in FIG. 6, the corners of the corner segments 1 are integrated by welding the horizontal and vertical H-shaped steels 3, 3 via a diagonal H-shaped steel 3 'cut into a trapezoidal shape. A stiffener 4 'is fixed by welding between the upper and lower flanges of each H-shaped steel, thereby securing a strength capable of opposing the bending moment.

The joint end of the horizontal portion of the corner segment 1, the joint end of both sides of the slab segment 2 and the joint end of the vertical portion of the upper and lower corner segments 1, 1 are provided on mutually opposing surfaces as shown in FIGS. As shown in FIG. 2, lap joints 7 and 7 'such as phased joints which are engaged in the vertical direction are provided, and the insides of the mutually joined ends are substantially the same as the cross-sectional shape of the joint steel 8 such as an H-section steel. The joint type steel 8 is slidably inserted into one of the slots 9 from inside to outside.

An operation opening 10 for sliding the joint steel 8 from the inside of the groove 9 to the outside is provided on the inner peripheral side of the lining of the segment 1 or 2 having the groove 9 into which the joint steel 8 is inserted. Are formed.

Further, box joints 11 for bolt joints are provided corresponding to joint ends of the horizontal and vertical portions of the corner segment 1 and joint ends of both sides of the slab segment 2 respectively. .

At the time of construction, in the same manner as in the ordinary shield method, after excavating to an intended rectangular section by a rectangular section cutter device of a shield machine, a corner segment 1 and a slab segment 2 are used behind the excavation to obtain a rectangular section shown in FIG. Assemble into a cross-section ring.

For assembling the ring, first, corner segments 1 and 1 are installed at the left and right corners at the lower part of the excavated cross section, and the slab segment 2 is connected between the horizontal portions thereof with the lap joints 7 and 7 'such as joints. Then, the corner segment 1 and the slab segment 2 are temporarily fixed to the box joint 11 by bolts and nuts 12 and 13.

Next, the vertical portions of the left and right corner segments 1, 1 on the excavated cross section are placed on the vertical portions of the lower left and right corner segments 1, 1 installed as described above, and the boxes at the mutually joined ends are removed. The joints 11, 11 are temporarily fixed with bolts and nuts 12, 13, and the slab segment 2 is engaged between the horizontal portions of the left and right corner segments 1, 1 while the lap joints 7, 7 'such as phased joints are engaged. The corner segment 1 and the slab segment 2 are temporarily fixed at the boxed joint portion 11 by bolts and nuts 12 and 13.

At each of the joint ends, the joint steel 8 inserted into the slot 9 is slid through the operation opening 10 (by grasping a handle or the like attached to the joint steel 8), and the first half of the joint steel 8 is removed. After being inserted and connected into the other opposing slot 9 ′, the operation opening 10 is filled with mortar or the like and closed.

Next, a hardening material liquid such as high-strength, high-strength cement milk or the like is injected into the slots 9, 9 'to solidify and integrate the joint type steel 8.

In addition, bolts and bolts are used as temporary fixing joint hardware.
Instead of the nuts 12 and 13, a cotter joint or the like may be used.

[0020]

As described above, according to the present invention, it is possible to lining a shield tunnel having a rectangular cross section having a sufficient strength against bending moment without using an excessive lining member, and to improve the workability of a joint portion. Good and high joint strength can be obtained.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional side view showing a joined state of segments according to the present invention.

FIG. 2 is a longitudinal sectional side view showing a state before joining segments used in the present invention.

FIG. 3 is a front view of a joining surface of a segment according to the present invention.

FIG. 4 is a front view of a rectangular segment ring assembled according to the present invention.

FIG. 5 is a sectional view taken along line AA in FIG. 4;

FIG. 6 is a vertical sectional front view of a corner portion of a corner segment according to the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Corner segment 2 Slab segment 3 H-shaped steel 4 Stiffener 4 'Stiffener 5 Mesh bar 6 Cavity 7 Lap joint 8 Joint type steel 9 Slot 9' Slot 10 Operation opening 11 Boxed joint 12 Bolt 13 Nut

Claims (1)

(57) [Claims] 1. A corner segment of an SRC formed by digging into an intended rectangular section by a rectangular section cutter device of a shield machine, and then forming a horizontal angle and a vertical section at left and right corners at a lower portion of the digging section. Is installed, and a flat SRC slab segment is inserted between its horizontal portions while engaging a joint such as a phased joint provided on the mutually facing surfaces, and the corner segment and the slab segment are joined to each other. Temporarily fixed by a joint at the end, and on the vertical part of the lower left and right corner segments, put the vertical parts of the left and right corner segments of the upper part of the excavated cross section formed into an angled cross section from the horizontal part and the vertical part, Joints which are temporarily fixed with joint fittings at the joint ends of the slab segments and slab segments are provided on the mutually facing surfaces between the horizontal portions of the left and right corner segments. And the like, and the corner segment and the slab segment are temporarily fixed by a joint at the mutual joint end, and an H-shaped groove provided inside one of the joint ends of the segments. An H-shaped cross section in which a joint type steel fitted slidably in the axial direction from the inside to the outside in the hole is slid outwardly, and the first half thereof is provided at the joining end of the other segment corresponding to the slot. After being inserted and connected to the slots, a hardening liquid such as a high-strength high-strength cement milk is injected into the slots to solidify and integrate the joint-type steel. Lining method of shield tunnel.