JP2988436B2 - Segment joint structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention particularly relates to constructing a plurality of small-section shield tunnels close to each other, joining and integrating the small-section shield tunnels, and excavating the inside thereof to construct a large-section tunnel. The present invention relates to a joint structure of segments for joining segments.

[0002]

2. Description of the Related Art The present applicant has proposed a method for constructing a large-section tunnel efficiently and economically, for example, by referring to FIG.
As shown in FIGS. 11 and 12, a plurality of small-section shield tunnels a are dug in close proximity, the small-section shield tunnels a are joined to each other, and the inside of each small-section shield tunnel a and the small-section shield tunnel a A large-section shield was constructed by casting concrete at the joint between, a and constructing a large-section shield, and then excavating the inside of the large-section shield by a conventional method.

[0003] In this case, the inner periphery of each small-section shield tunnel a is covered with a steel segment. At this time, at the junction A between the small-section shield tunnels a, a (see FIG. 12), a large-section tunnel is formed. By connecting the main girders of the steel segments adjacent in the circumferential direction to each other, the steel segments can effectively function as structural members (particularly, tensile resistance materials) of the large-section tunnel A. For this reason, in order for the steel segments to function effectively as structural members of the large-section tunnel, it is necessary to securely join the steel segments at the junction A between the small-section shield tunnels a.

[0004]

However, at the joint between the steel segments at the joint a, when the shield machine is excavated in the small-section shield tunnel a, the shield machine is moved in the tunnel axial direction (X).
Direction), the error caused by moving in the direction perpendicular to the tunnel axis (Y direction) and the direction perpendicular to the tunnel (Z direction), and the rotation of the shield machine around the tunnel axis direction, the direction perpendicular to the tunnel axis and the direction perpendicular to the tunnel ( An error caused by rolling, pitching, and yawing is combined to generate a three-dimensional relative error (see FIGS. 13A to 13G).

[0005] For this reason, there has been a problem that the required quality cannot be sufficiently satisfied due to the difficulty of construction and the like in the joining method such as welding or friction joining using a contact plate which is usually used.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-described problems, and in particular, absorbs three-dimensional relative errors between steel segments at a junction between small-sized shield tunnels to reduce the number of steel segments. It is an object of the present invention to provide a joint structure of segments which can reliably and easily join the segments.

[0007]

In order to solve the above-mentioned problems, a segment joint structure according to the present invention comprises a connecting rod for bridging a segment connecting bracket between adjacent segments, and a connecting rod vertically extending between both ends thereof. A triangular joint having a protruding support plate and having a triangular shape. The segment joint fitting is bridged between adjacent segments, and the triangular joint is attached to an end of the segment. Each of the triangular joints and the box-shaped joints has a synthetic resin material, mortar, high-strength concrete, or engages with a box-shaped joint formed in a box shape having a supporting plate opposed to the pressure plate. It is configured by filling a filler such as non-shrink mortar.

The connecting rod of the segment fitting is divided into a plurality of portions, and the plurality of portions are connected by connecting bolts.

Further, a plurality of plates are interposed between the support plate of the triangular joint and the support plate of the box joint, and a synthetic resin material, mortar, high-strength concrete, or non-shrink mortar is used as a filler. ing.

[0010]

1 to 10 show an embodiment of the present invention. In the drawings, a plurality of small-section shield tunnels a are dug in parallel with each other in close proximity to each other, and these small-section shield tunnels a are connected to each other. A rectangular large-section shield is constructed by joining together and continuously casting concrete b in each small-section shield tunnel a and at the junction a between the small-section shield tunnels a. The inside of the shield is excavated by a conventional construction method, and thus a shield tunnel A having a large cross section is constructed.

The inner periphery of each small-section shield tunnel a is covered with a plurality of steel segments 1, and the adjacent small-section shield tunnels a and a are connected at their upper and lower ends by a plurality of segment joints 2. Are joined. Further, a plurality of stiffening columns 3 and stiffening beams 4 are provided in each small-section shield tunnel a.

In the steel segment 1, a plurality of middle main girders 1a and side main girders 1b are installed in the circumferential direction of each small-section shield tunnel a in parallel with each other.
A plurality of end vertical ribs 1c and intermediate vertical ribs 1d are attached at predetermined intervals between 1a and the side main girder 1b, and a face plate 1e is attached to the outside of the frame formed in a lattice shape by these members to form a rectangular plate. Is configured.

The middle main girder 1a, the side main girder 1b, the end vertical rib 1c and the intermediate vertical rib 1d are all made of flat steel or a shaped steel such as an H-shaped steel or an I-shaped steel. These members are formed of a steel plate, and these members are integrally joined to each other by welding or joining bolts.

The segment joint fitting 2 is formed by projecting triangular joints 6 at both ends of a connecting rod 5 made of flat steel, shaped steel, reinforcing steel, PC steel (PC steel rod, PC steel strand), or the like. Is formed. The triangular joint 6 has supporting plates 6a vertically protruding on both sides of the end of the connecting rod 5, respectively, and a stiffening plate 6b is formed between the ends of the left and right supporting plates 6a and the end of the connecting rod 5. By attaching the side plates 6c between the edges of the supporting plate 6a and the stiffening plate 6b, the center main girder 1a
It is formed in a triangular shape in plan view such that it can be fitted between 1a and the side main girder 1b. The support plate 6a is attached to both sides of the connecting rod 5 by welding, and the stiffening plate 6b and the side plate 6b are also attached by welding.

A plurality of the segment joint fittings 2 formed as described above are bridged between the upper end and the lower end of the adjacent small-section shield tunnels a, a, and the triangular joints 6 at both ends are made of steel segments. It is engaged between adjacent main main beams 1a, 1a and between the main main beam 1a and the side main beam 1b through a slit 1f formed in the one end vertical rib 1c.

At the end between the adjacent main girders 1a, 1a, and between the middle main girder 1a and the side main girder 1b, a partition plate is provided close to the end vertical rib 1c.
By attaching 1 g, box joints 7 for engaging the triangular joint 6 are formed in a box shape. Further, the box-shaped joint 7 is filled with a filler 8 made of a synthetic resin material, mortar, high-strength concrete, or non-shrink mortar after engaging the triangular joint 6.

The filling property can be enhanced by partially filling the box-shaped joint 7 only with a synthetic resin material, mortar, high-strength concrete, or non-shrink mortar as the filler material 8. Shield tunnel a, a
The same concrete as the concrete filled in the joint between them may be filled simultaneously with the joint.

When the filling material 8 is filled, at the upper end side between the small-section shield tunnels a, a,
Is filled in an upward state (see FIG. 7), and is filled in a downward state at the lower end side between the small-section shield tunnels a, a (see FIG. 8).

Since the synthetic resin material is extremely expensive, it is desirable to fill only a very limited portion of the box-shaped joint 7. If the resin is to be filled upward, an airbag-like material must be installed in advance. Further, by press-fitting the filler, sagging (falling) and leakage of the filler can be prevented, and high filling properties can be ensured.

In this manner, the triangular joint 6 of the segment joint 2 is integrally fixed to the end of the steel segment 1, and thus the adjacent small-section shield tunnels a are connected to each other via the plurality of segment joints 2. Are joined together.

The tensile stress between the steel segment 1 and the segment joint 2 is mainly the supporting plate of the triangular joint 6.
6a, the filler 8, and the end vertical rib 1c (support plate), and thus the tensile stress between the adjacent small-section shield tunnels a, a is transmitted.

Reference numeral 1h denotes a stiffening rib for reinforcing the end vertical rib 1c. In addition, the connecting rod 5 of the segment joining fitting 2
Is formed by connecting the two rods 5a with a plurality of high-strength bolts 9 so that the segment joining metal fitting 2 can be divided into two parts at the center part, so that transportation, loading and mounting can be performed. In this case, workability can be improved by weight reduction (see FIG. 2). At that time, the high-strength bolt 9
The length of the connecting rod 5 can be freely adjusted by making the bolt holes (not shown) of the present invention into elongated holes, so that the installation interval between adjacent small-section shield tunnels a, a can be freely dealt with.

Further, the connecting rod 5 of the segment joining metal fitting 2 is joined with two connecting rods 5a, and these two are connected to the high-strength bolt 9
It is also possible to reduce the weight by forming a part so that the segment joint fitting 2 can be divided into two parts on the left and right (see FIG. 10). Furthermore, a plurality of plates 10 having an appropriate thickness are interposed between the end vertical rib 1c (support plate) of the box-shaped joint 7 and the support plate 6a of the triangular joint 6 to reduce the swallow length of the triangular joint 6. By making the adjustment possible, the installation interval between the steel segments 1 and 1 can be freely adjusted (see FIG. 6).

Since the adjacent small-section shield tunnels a, a are joined to each other in this manner, the segment joining metal fitting 2 is filled before filling the gap between the triangular joint 6 and the box joint 7 with the filler 8. By changing the direction freely,
The three-dimensional relative error between the steel segments 1 at the joint between the small-section shield tunnels a, a can be easily absorbed, and the steel segments 1 can be easily joined together.

In the embodiment of the invention, the steel segment 1 at the junction between the small-section shield tunnels a, a
Although the structure of the joints between them has been described, it is needless to say that the present invention can be applied to the joints between the segments that line the inner periphery of the single tunnel, and also to the joints between the concrete segments. Needless to say, the present invention can be applied to a junction between any segments for constructing a rectangular shield tunnel and a circular shield tunnel.

[0026]

The segment joint structure according to the present invention has the above-described structure, and has a connecting rod for bridging the segment connecting bracket between the segments, and a supporting plate projecting vertically at both ends thereof. And a triangular joint having a triangular shape.The segment joint metal is bridged between the adjacent segments, and the triangular joint has a bearing plate facing the bearing plate at an end of the segment. Respectively engaged with the box-shaped joint formed in a box shape,
And since the adjacent segments are joined by filling the gap between the triangular joint and the box-shaped joint with the filler, before filling the gap between the square joint and the box-shaped joint with the filler. By freely changing the direction of the segment joining bracket, it is possible to easily absorb the three-dimensional relative error between the segments at the joining portion between the small-section shield tunnels, and to have an effect that the segments can be joined reliably and easily. .

[Brief description of the drawings]

FIG. 1 is a sectional view of a large section tunnel.

FIG. 2 is a partial perspective view of a steel segment.

FIG. 3 is a partial cross-sectional view of a steel segment joint.

FIG. 4 is a sectional view taken along line aa in FIG. 3;

FIG. 5 is a sectional view taken along line bb in FIG. 3;

FIG. 6 is a sectional view taken along line aa in FIG. 3;

FIG. 7 is a partial sectional view of a steel segment joint.

FIG. 8 is a partial sectional view of a steel segment joint.

FIG. 9 is a partial perspective view of a steel segment joint.

FIG. 10 is a partial side view of the segment joining fitting.

FIG. 11 is a partial perspective view of a large-section tunnel.

FIG. 12 is a sectional view of a large section tunnel.

13 (a), (b), (d), (e), (f), (g) are perspective views showing the behavior of a small-section shield tunnel during excavation.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Steel segment 1a Middle main girder 1b Side main girder 1c End vertical rib 1d Intermediate vertical rib 1e Face plate 1f Slit 1g Partition plate 1h Stiffening rib 2 Segment joint fitting 3 Stiffening column 4 Stiffening beam 5 Connecting rod 5a Connection Rod 6 Triangular joint 6a Support plate 6b Stiffening plate 6c Side plate 7 Box-shaped joint 7a Support plate 8 Filler 9 High-strength bolt

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-10-115176 (JP, A) JP-A-9-296693 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) E21D 11/04 E21D 11/14

Claims (4)

(57) [Claims] 1. A segment joint structure for joining segments adjacent to each other in the circumferential direction of a tunnel through a segment joining metal fitting, wherein the segment joining metal fitting has a connecting rod, and a supporting plate vertically projecting from both ends thereof. And a triangular joint formed into a triangular shape, and the segment joining bracket is bridged between the adjacent segments, and the triangular joint is provided at the end of the segment at the end of the segment and the support plate facing the support plate. And a gap between the triangular joint and the box-shaped joint is filled with a filler to engage with the box-shaped joint having a box shape. . 2. The segment joint structure according to claim 1, wherein a connecting rod of the segment connecting bracket is divided into a plurality of portions, and the plurality of portions are connected by connecting bolts. 3. The segment joint according to claim 1, wherein a plurality of plates are interposed between the support plate of the triangular joint and the support plate of the box-like joint. Construction. 4. The joint structure for a segment according to claim 1, wherein the filler is a synthetic resin material, mortar, high-strength concrete, or non-shrinkable mortar. .