JP3289658B2 - Segment joint structure and joint method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a joint structure and a joint method for a steel segment used as a primary lining material of a shield tunnel.

[0002]

2. Description of the Related Art As a method for joining segments adjacent to each other in the circumferential direction of a tunnel, for example, as shown in FIG. A method of joining by bolting with a plurality of high-strength bolts 22 penetrating in the direction is generally known, and is widely applied particularly when lining the inner periphery of a tunnel having a circular cross section.

By the way, the applicant of the present invention has proposed a method of constructing a large-section tunnel efficiently and economically, for example, by excavating a plurality of small-section shield tunnels 23 as shown in FIG. The small-section shield tunnel 23 is joined to each other, and concrete is cast into the small-section shield tunnel 23 to form a large-section shield tunnel 23.
Tunnel construction method for constructing a large-section tunnel by excavating the inside of this large-section shield 24 (MMS
T method) and several patents have already been filed in this regard. In this method, the inner periphery of the small-section shield tunnel is lined with steel segments, and the adjacent steel segments are joined by bolting with high-strength bolts.

[0004]

However, in the conventional joint structure as described above, the transmission of bending stress and tensile stress at the joint portion is performed through the joint plate 21. And the joint plate 21 may be easily deformed as shown in FIGS. 4 (b) and 4 (c).
FIG. 4B shows a deformed state of the joint plate 21 when a bending moment is applied, and FIG. 4C shows a deformed state of the joint plate 21 when a tensile stress is applied.

As described above, if the joint plate 21 is easily deformed, there is a problem in that the joint plate 21 cannot function as a primary lining material for stopping water in the shield tunnel and maintaining the shape of the segment ring.

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and is a segment joint in which segments adjacent to each other in the circumferential direction of a shield tunnel can be securely and firmly joined together, and high water stopping performance can be maintained. It is an object to provide a structure and a joint method thereof.

[0007]

According to a first aspect of the present invention, there is provided a joint structure for a segment, wherein a plurality of main girders installed in parallel with a circumferential direction of the tunnel and a shaft of the tunnel are provided between ends of the main girders. In the joint structure of the segment that joins the segments having the longitudinal rib material for the joint installed in the direction in the circumferential direction of the tunnel by the joint plate and the joint bolt,
Propulsion reaction of shield jack between adjacent main girders
Prescribed vertical ribs for reinforcement at predetermined intervals in the longitudinal direction of the main girder
Attached to the notice, the main spar and the longitudinal rib material for a joint formed at substantially the same height as, the joint plate in the longitudinal rib material for the joint respectively the opening of the slidable size, the
Temporary fastener for temporarily fixing the joint plate near the opening
Attached , and while bridging the joint plate between the ends of the main girder material through the opening, both ends thereof are attached to the side of the end of the main girder material, and the end of the joint plate and the end It is characterized in that the end of the main girder is joined with a plurality of joint bolts.

[0008] The joint structure of the segment according to the second aspect,
In the joint structure of a segment according to claim 1, the opening in the longitudinal rib material for a joint provided located on opposite sides of the main spar, the opening
A plurality of joint plates are bridged between the mouths , both ends of which are respectively attached to both sides of the main girder material end, and the end of the joint plate and the end of the main girder material are connected to a plurality of joints. It is characterized by being joined by bolts. Further, the joint structure of the segment according to the third aspect is characterized in that, in the joint structure of the segment according to the first or second aspect, horizontal reinforcing ribs are protruded from the vertical rib material for the joint. .

According to a fourth aspect of the present invention, there is provided a method of joining segments.
4. The method for joining segments according to claim 1, 2 or 3, wherein said segments are overlapped with each other in the circumferential direction of the tunnel, and then one segment is installed. The joint plate that has been temporarily attached to the side of the main girder material with the temporary fastener is slid in the opening in the circumferential direction of the tunnel and extruded toward the other segment side, so that the main girder material of both segments is The present invention is characterized in that the joint plate and the end of the main beam are bolted with a plurality of joint bolts.

[0010]

1 and 2 show an embodiment of the present invention, in which the inner periphery of a tunnel is covered with a plurality of steel segments 1, and a steel adjacent to the tunnel in the circumferential direction of the tunnel is used. The segments 1 are joined to each other by high-strength bolt joining with a plurality of joint plates 2 and a plurality of joint bolts 3 and 4 (hereinafter, referred to as “high-strength bolt 3” and “high-strength bolt 4”).

In the steel segment 1, a plurality of main girder members 5 are installed in parallel in the circumferential direction of the tunnel, and longitudinal rib members 6 for joints are respectively provided on both ends of the plurality of main girder members 5 along the tunnel axial direction. A plurality of reinforcing vertical rib members 7 are installed at predetermined intervals in the longitudinal direction of the main girder members 5 between the adjacent main girder members 5 to form a rectangular lattice frame 8. A skin plate 9 is attached to one side of the frame 8, and all of these members are integrally joined to each other by welding.

Each of the main girder member 5, the joint vertical rib member 6 and the reinforcing vertical rib member 7 is formed in a strip shape having a predetermined beam height (height). Horizontal reinforcing ribs 6a and 7a protrude from the edges of the reinforcing rib member 6 and the reinforcing vertical rib member 7 in order to obtain sufficient strength as a reaction force receiving member for obtaining the propulsive force of the shield jack (not shown). I have. Further, the main girder member 5 and the joint vertical rib member 6 are formed in substantially the same beam structure, and the reinforcing vertical rib member 7 is formed in a smaller beam member. Further, the reinforcing ribs 7 are effective to act as a reaction force receiver for obtaining the propulsive force of the shield jack (not shown), and are also effective as a buckling prevention material for the main girder 5 so that the installation interval is set. It has been adjusted.

The joint vertical rib 6 and the horizontal reinforcing rib 6a
Has a cross-sectional design in which two joint vertical rib members 6 to be joined and these horizontal reinforcing ribs 6a are integrated to form a set of reaction force receiving members. 7A
And the horizontal reinforcing ribs 7a protruding from the upper end thereof,
A cross-sectional design is made so that each of these two parts forms a set of reaction force receivers.

Further, a vertical rib member 6 for a joint and a vertical rib member for reinforcement
7A is designed in cross section in consideration of a cross section defect due to an opening 11 described later.

Accordingly, the thickness of the joint vertical rib member 6, the reinforcing vertical rib members 7, 7A, and the horizontal reinforcing rib 6a are not uniform, and the plate thickness of the joint vertical rib member 6 and the horizontal reinforcing rib 6a are not uniform. Is thinner than the thickness of the reinforcing vertical rib member 7A and the horizontal reinforcing rib 7a protruding from the upper end thereof, and the projecting length of the horizontal reinforcing rib 6a is also shorter than the projecting length of the horizontal reinforcing rib 7a in principle.

The thickness of the reinforcing vertical rib member 7 and the horizontal reinforcing rib 7a protruding from the upper end thereof are, in principle, the same as the reinforcing vertical rib member 7A and the horizontal reinforcing rib 7a protruding from the upper end thereof. The thickness of the horizontal reinforcing rib 7a protruding from the reinforcing vertical rib 7 is shorter than the length of the horizontal reinforcing rib 7a protruding from the reinforcing vertical rib 7a. .

Further, a bolt hole 10 for tightening the high-strength bolts 3 and 4 is formed in the end of the main beam 5 and the longitudinal rib 6 for the joint.
a and 10b are respectively formed at predetermined intervals, and the joint plate 2 is temporarily attached to the joint longitudinal rib member 6 and the reinforcing longitudinal rib member 7A along with the main girder member 5 on the reinforcing longitudinal rib member 7A. Openings 11 are respectively formed. A temporary fixing hole 13 is formed near the opening 11 for passing a temporary fixing metal 12 for temporarily fixing the joint plate 2.

The openings 11 are located on both sides of the main girder 5 and are formed in a rectangular shape having a size such that the joint plate 2 can slide along both sides of the main girder 5. Further, when the joint plate 2 is particularly long, the opening 11 is also formed in the reinforcing vertical rib material adjacent to the reinforcing vertical rib material 7A. Further, since the reinforcing vertical rib member 7A has the opening 11, the reinforcing vertical rib member 7A is formed to have substantially the same beam structure as the joint vertical rib member 6 in principle. The joint plate 2 is bridged between the opening 11 of the joint vertical rib member 6 and the opening 11 of the reinforcing vertical rib member 7a,
A temporary fixing metal fitting 12 is passed through a temporary fixing hole 13 and a temporary fixing bolt 15 is inserted into a bolt hole 14 of the joint plate 2 and a bolt hole 10a of the main girder material 5 so that the side of the main girder material 5 is formed. Temporarily attach and attach.

The joint plate 2 has a plurality of bolt holes 14. The joint plate 2 is extended between the ends of the main beam members 5, 5 of the steel segment 1 adjacent to the tunnel in the circumferential direction, attached to both sides thereof. The main girder members 5 are joined to each other by inserting the high-strength bolts 3 into the bolt holes 14 of the joint plate 2 and the bolt holes 10a of the main girder member 5, and the joint reinforcing rib members 6 are overlapped.
The joint reinforcing rib members 6 are joined together by inserting the high-strength bolts 4 into the bolt holes 10b. Thus, the steel segments 1 adjacent in the circumferential direction of the tunnel are joined to the joint plates 2 and High-strength bolts 3 and 4 respectively.

In such a configuration, a method of joining steel segments will be described (see FIGS. 2A to 2E).

First, prior to installing the steel segment 1A, the joint plate 2 is temporarily attached to the steel segment 1A in advance (see (a)).

Next, the steel segment 1A is installed adjacent to the steel segment 1B in the circumferential direction of the tunnel by an erector (not shown). And with steel segment 1A
The joint vertical rib members 6 of 1B are overlapped with each other so that both bolt holes 10b coincide (see (b)). that time,
The joint vertical rib members 6 are securely brought into close contact with each other so that no gap is formed between the joint vertical rib members 6.

Next, the high-strength bolts 4 are respectively fastened to the bolt holes 10b to join the joint vertical rib members 6 together.
At that time, the construction error between the steel segments 1A and 1B is corrected.

Next, the temporary fixing bolts 15 and the temporary fixing fittings 12 are removed, and the temporary attachment of each joint plate 2 is released. Then, the joint plate 2 is pushed out to the steel segment 1B side, slid along the main girder member 5 toward the steel segment 1B, and both ends between the ends of the main girder members 5, 5 are connected to the main girder member 5B. Hang along the side of. Then, the high-strength bolts 3 are fastened to the bolt holes 10a of the main girder member 5 and the bolt holes 14 of the joint plate 2, respectively, and the end of the main girder member 5 and the joint plate 2 are joined. In this way, the steel segments 1A and 1B can be reliably joined by high-strength bolt joining.

[0025]

The present invention has the above-described structure,
In particular, since the segments adjacent to each other in the circumferential direction of the tunnel are joined at the ends of both main beam members continuous in the circumferential direction of the tunnel by high-strength bolt joining with a plurality of joint plates and joint bolts, bending force, etc. Large tensile force can be reliably received, and the strength is extremely excellent.

Further, since the two longitudinal rib members for the joint that are continuous in the axial direction of the tunnel are overlapped with each other and are bolted with a plurality of joint bolts, the water stopping property of the joint portion can be reliably maintained. . In addition, since the main girder member directly receives and bears the large tensile force of the joint portion, the vertical rib material for the joint is not deformed and the water stopping property of the joint portion is not impaired.

Further, longitudinal rib members for joints continuous in the axial direction of the tunnel are respectively installed at both axial end portions of the main girder material, and reinforcing longitudinal ribs continuous in the axial direction of the tunnel between the main girder materials. Since a plurality of members are installed at predetermined intervals in the circumferential direction of the tunnel, and furthermore, horizontal reinforcing ribs are projected from the joint vertical rib members, or the joint vertical rib members and the reinforcing vertical rib members, respectively, these members are used. It can be used as a reaction force receiver to obtain the propulsion of the shield jack.

The method for joining segments according to the present invention comprises:
A joint plate is temporarily attached to the side of the main girder material of one segment in advance, and after installing this one segment at a predetermined position with an erector, the joint plate is extruded to the other segment side to end the main girder material. Since the bridge is fastened to the bridge, there is no need to carry the joint plate to the joint part again, so that extra manual work can be omitted and the segments can be joined very efficiently.

[Brief description of the drawings]

1 (a) and 1 (b) both show a joint portion of a steel segment, (a) is a perspective view showing a state before joining, and (b) is a perspective view showing a state after joining.

FIGS. 2 (a) to 2 (e) are process diagrams showing a method of joining steel segments.

FIG. 3 is a longitudinal sectional view of a large section shield tunnel having a rectangular section.

4A is a cross-sectional view showing an example of a conventional joint of a steel segment, and FIGS. 4B and 4C are cross-sectional views showing a state after deformation of the steel segment joint. FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Steel segment 1A Steel segment 1B Steel segment 2 Joint plate 3 High strength bolt 4 High strength bolt 5 Main girder material 6 Vertical rib material for joint 7 Vertical rib material for reinforcement 7A Vertical rib material for reinforcement 8 Grid frame 9 Skin plate 10a Bolt hole 10b Bolt hole 11 Opening 12 Temporary fixing bracket 13 Temporary fixing hole 14 Bolt hole 15 Temporary fixing bolt

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-9-291795 (JP, A) JP-A-9-242480 (JP, A) JP-A-4-106299 (JP, A) 46194 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) E21D 11/04-11/14

Claims (4)

(57) [Claims] 1. A segment comprising a plurality of main girder members installed in parallel with a circumferential direction of a tunnel, and a longitudinal rib member for a joint installed between ends of the main girder members in an axial direction of the tunnel. the in joint structure of the segment to be joined by the joint plates and the joint bolt in the circumferential direction of the tunnel, adjacent
Receiving propulsion reaction force of shield jack between the main girder members
Vertical ribs for reinforcement at predetermined intervals in the longitudinal direction of the main girder.
Attached to come, the main the spar and the longitudinal rib material for a joint formed at substantially the same height as, the joint plate respectively the opening of the slidable magnitude longitudinal rib material for the joint, the open
Near the mouth to temporarily fix the joint plate
Mounting , bridging the joint plate between the ends of the main girder material through the opening, attaching both ends thereof to the sides of the main girder material end portions, and connecting the end of the joint plate to the main girder material end portion. A joint structure for a segment, wherein an end of a girder member is joined with a plurality of joint bolts. 2. A longitudinal rib member for a joint is provided with openings on both sides of a main girder member, a plurality of joint plates are bridged between the openings , and both ends of the longitudinal rib member are on both sides of an end of the main girder member. 2. The joint structure for a segment according to claim 1, wherein the joint plate is attached to each of the joints, and an end of the joint plate and an end of the main girder are joined by a plurality of joint bolts. 3. The joint structure for a segment according to claim 1, wherein horizontal reinforcing ribs are projected from the vertical rib material for the joint. 4. The joint structure for a segment according to claim 1, wherein the segments are joined in the circumferential direction of the tunnel, and the segment is provided by overlapping both longitudinal rib members for the joint in the circumferential direction of the tunnel. After that, the joint plate, which has been temporarily attached to the side of the main girder member of one segment by a temporary fixing metal, is slid in the opening in the circumferential direction of the tunnel and extruded toward the other segment, thereby forming a joint between the two segments. A method for joining a segment, comprising bridging between main girder members, and bolting the joint plate and an end of the main girder member with a plurality of joint bolts.