JP7201449B2 - Fixing jig for temporary internal shoring - Google Patents

Description

TECHNICAL FIELD The present invention relates to a jig for fixing temporary internal shoring to segments used in shield tunnel construction.

Among the tunnel constructions in the shield construction method, especially in road tunnels, there are cases where U-turn roads and connecting roads are constructed to connect adjacent up-and-down tunnels with lateral tunnels for the purpose of evacuation and inspection in an emergency. These work involves excavating a part of the tunnel by a non-cutting method in the ground. Conventionally, steel segments that can be cut by gas have been used for the segments of the same ring that include the target range of incision.
In order to prevent destabilization of the tunnel due to excision work, reinforcement work will be carried out inside the tunnel with temporary internal shoring. This temporary internal shoring is fixed along the shape of the inner surface of the tunnel that connects the temporary internal shoring and the tunnel, in order to bear cross-sectional forces such as axial force that had been acting on the segment until then by cutting the segment. Excessive sliding force acts on the beam material. If the segment is made of steel, it is possible to relatively easily fix the beam member and the segment by using a temporary member such as a vertical rib member that constitutes the segment.
However, in recent years, from the viewpoint of mitigating the decrease in rigidity of the entire tunnel due to the incision and reducing costs, even with the same ring, steel segments are applied only to the minimum range including the incision, and the rest is concrete-based segments. is increasing, and when the installation range of beams is related to concrete segments, the means of fixing the beams to the segments becomes a problem.
As a method of fixing such temporary materials to concrete segments, generally, a method of screwing bolts into female inserts embedded in the segments in advance is adopted. It is susceptible to installation errors in the tunnel cross-sectional direction, such as yawing, rolling, and pitching, and expansion and contraction in the axial direction of the tunnel, increasing the possibility that the insert will not be placed at the desired position.
For reference, in Patent Document 1, an internal shoring is installed in a tunnel, a curved pipe roof is placed in a part of a widened section in the tunnel axial direction that connects a pair of tunnels, and the curved pipe roof is used to support the ground. While pre-supporting the mountain, the upper space of the curved pipe roof installation section is formed in advance, and a long steel pipe is cast in the tunnel axial direction through the upper space of the curved pipe roof installation section to form the upper space of the curved pipe roof installation section. There is a form in which the ground above the section where the long steel pipe is installed is excavated while supporting the ground with long steel pipes so as to extend in the axial direction of the tunnel in order to form an upper space that communicates throughout the widened section. disclosed.

JP 2009-46897 A

An object of the present invention is to provide a fixture for temporary internal shoring that can absorb the effects of construction errors in inserts embedded in segments of a shield tunnel.

A fixing jig for a temporary internal shoring according to the present invention for solving the above-mentioned problems is a temporary internal shoring fixing jig for fixing a temporary internal shoring arranged along the inner surface of a shield tunnel formed by segments to the segments . The fixing jig comprises a holding member and a bolt, the holding member has an L-shaped cross section, and is attached to the segment by tightening the bolt to the insert embedded in the segment. Both ends of the flanges of the beam members that constitute the temporary internal shoring that are fixed and adhere closely along the inner surface of the segment are hooked by the opposing holding members, and both side surfaces of the flanges and the holding members are hooked. A gap is formed between them, and a gap is provided between a plurality of stiffeners arranged orthogonally to the web of the beam and the flange, and the restraining material. fillet welding is performed along the peripheral surface that hangs on the flange .

By applying the fixing jig for temporary internal shoring of the present invention, even if the position of the insert fluctuates due to various construction errors associated with shield construction, the temporary internal shoring can be reliably fixed to the inner surface of the segment. .

FIG. 4 is a cross-sectional view of a tunnel at the time of installation of a temporary inner shoring fixed to the inner surface of the tunnel by the fixing jig of the present invention; (a) is a plan view of the fixing jig of the present invention (as viewed from arrow AA in FIG. 1); (b) is a cross-sectional view of the fixing jig of the present invention (as viewed from arrow BB in FIG. 2(a)).

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 shows a cross-sectional view of a tunnel at the time of installation of temporary inner shoring fixed to the inner surface of the tunnel by the fixing jig of the present invention.
A lining 1 consisting of a plurality of segment pieces forming the outer shell of a circular tunnel T constructed in the ground G is composed of at least two types of segments, a steel segment 11 and a concrete segment 12, in one ring cross section. It is Since it is connected to another tunnel to be connected by the sideway S, the construction range of chemical injection pipes (not shown) and pipe roof P, etc. for the purpose of water stoppage and ground maintenance, including the connection with the sideway S The steel segment 11 is applied because of the ease of installation and processing of temporary materials and equipment such as incisions by gas fusion cutting, injection pipes and pipe roof joints.

In order to prevent the tunnel from becoming unstable due to the incision in the steel segment 11, a temporary structure was installed in the tunnel prior to the incision in order to temporarily receive the sectional force such as the axial force acting on the segment. An internal shoring 2 is placed. The temporary internal support 2 is mainly made of H-shaped steel material, and consists of beam members 21, 21 arranged along the upper and lower inner surfaces of the lining 1 so as to face each other in the tunnel cross-sectional direction, and a predetermined interval in the tunnel axial direction. Joist members 22, 22, 22, 22 installed on the left and right and upper and lower sides of the upper and lower beam members 21, 21, . 23 and . In this embodiment, a jack 24 that can be expanded and contracted by hydraulic pressure is interposed in the pillar member 23 . A plurality of horizontal joint members 26, 26, ... and diagonal joint members 25, 25, ... are arranged above and below the jack 24, respectively, so that the pillar members 23, 23 adjacent to each other with an interval left and right are connected. , to improve the rigidity of the entire temporary internal shoring 2 and prevent the buckling of the jack 24 portion.

FIG. 2(a) is a plan view of the fixing jig of the present invention taken along line AA in FIG. 1, and FIG. 4A and 4B respectively show cross-sectional views of the tools.
The beam material 21 mainly made of H-shaped steel and arranged along the inner surface of the lining 1 in the tunnel cross-sectional direction has an arc shape similar to the shape of the inner surface of the lining 1, and vertically opposed flanges 211. , 211, a web 212 and a plurality of stiffeners 213, 213 .
The fixing jig 3 of the present invention comprises a plate-like holding member 31 and a bolt 32 in plan view. Fixed. The restraining member 31 has an L-shaped cross section, and the opposite restraining members 31, 31 hold both side ends of a flange 211 arranged in close contact along the inner surface of the concrete-based segment 12. As shown in FIG. A fillet weld 33 is applied along the peripheral surface of the retaining member 31 over the flange 211 . Clearances are provided between both side surfaces of the flange 211 and the holding members 31, 31 and between the stiffening members 213, 213 . . . and the holding members 31, 31 . It is possible to absorb various construction errors that occur in the tunnel cross section and axial direction during construction. That is, if the beam 21 is installed within this gap, the overall length of the weld 33 does not change, so the fixing strength of the beam 21 to the concrete-based segment 12 by the weld 33 is not affected.

By applying the fixing jig for temporary internal shoring of the present invention, even if the position of the insert fluctuates due to various construction errors associated with shield construction, the temporary internal shoring can be reliably fixed to the inner surface of the segment. .

Although the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and can be modified as appropriate without departing from the scope of the present invention.

G Ground T Tunnel P Pipe Roof S Adit 1 Lining 11 Steel segment 12 Concrete segment 121 Insert 2 Temporary internal support 21 Beam 211 Flange 212 Web 213 Stiffener 22 Joist 23 Column 24 Jack 25 Diagonal joint Material 26 Horizontal connecting material 3 Fixing jig 31 Retaining material 32 Bolt 33 Welding

Claims (1)

A fixture for temporary internal shoring for securing to said segments a temporary internal shoring located along the inner surface of a shield tunnel formed by a segment, comprising:
The fixing jig is composed of a restraining material and a bolt,
The restraining material has an L-shaped cross section and is fixed to the segment by tightening the bolt to an insert embedded in the segment,
both side ends of the flanges of the beam member constituting the temporary internal support that adheres closely along the inner surface of the segment are latched by the opposing holding members;
A gap is formed between both sides of the flange and the restrainer, and a plurality of stiffeners arranged perpendicular to the web of the beam and the flange are spaced from the restrainer. A gap is provided,
Fillet welding is performed along the peripheral surface of the restraining material that hangs over the flange.
A fixing jig for temporary internal shoring, characterized by:

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