JP2020111995A - Fixture for temporary internal support - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fixing jig for temporary internal support capable of absorbing the influence of a construction error of an insert embedded in a segment of a shield tunnel. SOLUTION: This is a fixing jig 3 to a segment 12 of a temporary internal support 2 arranged along an inner surface of a shield tunnel T formed by a segment 12, and the fixing jig 3 is a holding member 31 and a bolt 32. The holding material 31 is fixed to the segment 12 by tightening bolts 32 to the insert 121 embedded in the segment 12, and the flange surface of the beam material 21 constituting the temporary internal support 2 which is in close contact with the inner surface of the segment 12. The ends on both sides of 211 were hooked by the holding members 31, 31 facing each other. [Selection diagram] Fig. 2

Description

TECHNICAL FIELD The present invention relates to a jig for fixing a temporary internal support work to a segment used for shield tunnel construction.

Of the tunnel construction in the shield construction method, especially in road tunnels, U-turn roads and connecting roads that connect adjacent vertical tunnels with sideways may be constructed for the purpose of emergency evacuation and inspection, These involve the work of cutting a part of the tunnel in the ground by the non-excavation method. Conventionally, a steel segment that can be melted by gas has been used for the segment of the same ring that includes the range to be cut.
In order to prevent the tunnel from becoming unstable due to cut-out work, reinforcement work will be performed in the tunnel by temporary internal support work. This temporary internal support is to be fixed along the shape of the inner surface of the tunnel that connects the temporary internal support and the tunnel, because the temporary internal support will bear the sectional force such as the axial force that has been acting on the segment until it is cut open. An excessive sliding force acts on the beam material. If the segment is made of steel, the beam member and the segment can be fixed relatively easily by using a temporary material such as a vertical rib material that constitutes the segment.
However, in recent years, from the viewpoint of mitigating the decrease in rigidity of the entire tunnel due to cutouts and cost reduction, even for the same ring, steel segments are applied only to the minimum range including the cutout points, and other than that, concrete segment When the installation range of the beam is related to the concrete segment, the means for fixing the beam to the segment becomes a problem.
As a method of fixing such a temporary material to the concrete-based segment, generally, a method of screwing a bolt to a female insert embedded in the segment in advance is adopted, but the segment ring that constitutes the tunnel is used when the shield machine is excavated. It is easily affected by construction errors in the tunnel cross-section direction such as yawing, rolling, and pitching, and expansion/contraction in the tunnel axial direction, and the insert may not be placed at a desired position.
For reference, in Patent Document 1, an internal support is installed in the tunnel, and a curved pipe roof is placed in a part of a widened section in the tunnel axial direction that connects a pair of tunnels. The upper space of the curved pipe roof installation section is formed in advance while supporting the mountain in advance, and a long steel pipe is driven in the tunnel axial direction through the upper space of the curved pipe roof installation section to create the upper space of the curved pipe roof installation section. There is a form in which the upper space communicating with the entire widening section is formed by excavating the natural ground above the long steel pipe installation section while receiving and supporting the natural ground with the long steel tube so as to sequentially extend in the tunnel axial direction. It is disclosed.

JP, 2009-46897, A

SUMMARY OF THE INVENTION An object of the present invention is to provide a fixing jig for temporary internal support which can absorb the influence of an installation error of an insert buried in a segment of a shield tunnel.

The fixing jig of the temporary internal support work of the present invention for solving the above-mentioned problem is a fixing jig to the segment of the temporary internal support work arranged along the inner surface of the shield tunnel formed by the segment, The fixing jig is composed of a retainer and a bolt, and the retainer is fixed to the segment by tightening the bolt in an insert embedded in the segment, and the temporary internal support work that adheres closely along the inner surface of the segment. It is characterized in that both ends of the flange surface of the constituting beam member are hooked by the pressing members facing each other.

By applying the fixing jig for temporary internal support according to the present invention, the temporary internal support can be reliably fixed to the inner surface of the segment even if the position of the insert changes due to various construction errors accompanying the shield work. ..

It is a tunnel sectional view at the time of temporary internal support work installation fixed to the inner surface of the tunnel by the fixing jig of the present invention. (A) It is a top view of the fixing jig of this invention (AA arrow of FIG. 1). (B) It is sectional drawing of the fixing jig of this invention (BB arrow of FIG. 2(a)).

Embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 shows a sectional view of a tunnel at the time of installation of a temporary internal support which is fixed to the inner surface of the tunnel by the fixing jig of the present invention.
The lining 1 composed of a plurality of segment pieces forming the outer shell of the circular tunnel T constructed in the ground G is composed of at least two kinds of segments, a steel segment 11 and a concrete-based segment 12, in one ring cross section. Has been done. Since it is connected to another tunnel that is installed side by side with the shaft S, the construction range of the chemical liquid injection pipe (not shown) and the pipe roof P, etc., which is performed for the purpose of stopping water and maintaining the ground, including the connection with the shaft S The steel segment 11 is applied because of the ease of cutting and opening due to gas fusing, attachment of temporary materials and equipment such as inlet pipes and pipe roof connections, and processing.

In order to prevent the tunnel from being destabilized by the opening of the steel segment 11, a temporary installation is made in the tunnel prior to the opening for the purpose of temporarily receiving the sectional force such as the axial force acting on the segment. Internal support 2 is arranged. The temporary internal support 2 is mainly composed of H-shaped steel material, and the beam members 21 and 21 arranged along the upper and lower inner surfaces of the lining 1 so as to face each other in the tunnel cross-section direction and a predetermined distance in the tunnel axial direction. The joist members 22, 22, 22, 22 that are erected on the left and right sides and above and below the upper and lower beam members 21, 21... Opened and arranged, and the pillar members that are disposed between the upper and lower facing joist members 22, 22. 23. In the present embodiment, the column member 23 is provided with a hydraulically expandable and contractible jack 24. By arranging a plurality of horizontal connecting members 26, 26... And diagonal connecting members 25, 25... Above and below the jack 24, respectively, adjacent column members 23, 23 are connected to each other with a space left and right. The rigidity of the entire temporary internal support structure 2 is improved, and the buckling of the jack 24 is prevented.

2A is a plan view of the fixing jig of the present invention taken along the line AA of FIG. 1, and FIG. 2B is a plan view of the fixing jig taken along the line BB of FIG. 2A. Sectional drawing of each ingredient|tool is shown.
The beam member 21 having an H-shaped steel material as a main material, which is arranged along the inner surface of the lining 1 in the tunnel cross-sectional direction, has an arc shape similar to the inner surface shape of the lining 1, and has flanges 211 facing each other in the vertical direction. , 211, the web 212, and a plurality of stiffening members 213, 213,...
The fixing jig 3 of the present invention comprises a pressing member 31 and a bolt 32 which are flat plate-shaped in a plan view, and the pressing member 31 is obtained by screwing the bolt 32 to a female insert 121 embedded in the concrete segment 12. It is fixed. The restraining member 31 has an L-shape in cross section, and has both ends of the flange 211, which are arranged so as to closely contact with each other along the inner surface of the concrete-based segment 12, are hooked by the restraining members 31 and 31 facing each other. In addition, fillet-welding 33 is applied along the peripheral surface of the restraining member 31 hanging on the flange 211. A gap is provided between both side surfaces of the flange 211 and the restraining members 31, 31, and between the stiffening members 213, 213... And the restraining members 31, 31,. This makes it possible to absorb various construction errors that occur in the tunnel cross section and axial direction due to construction. That is, if the beam member 21 is installed in the range of this gap, the total length of the weld 33 does not change, so that the fixing strength of the beam member 21 to the concrete-based segment 12 by the weld 33 is not affected.

By applying the fixing jig for temporary internal support according to the present invention, the temporary internal support can be reliably fixed to the inner surface of the segment even if the position of the insert changes due to various construction errors accompanying the shield work. ..

Although the embodiments of the present invention have been described above, the present invention is not limited to the above-described embodiments, and can be appropriately modified without departing from the spirit of the present invention.

G Ground T Tunnel P Pipe roof S Side pit 1 Lining 11 Steel segment 12 Concrete segment 121 Insert 2 Temporary internal support 21 Beam member 211 Flange 212 Web 213 Stiffener 22 Joist 23 Pillar 24 Jack 25 oblique connection Material 26 Horizontal tie material 3 Fixing jig 31 Holding material 32 Bolt 33 Welding

Claims (1)

A fixing jig for a segment of temporary internal support, which is arranged along the inner surface of the shield tunnel formed by the segment,
The fixing jig is composed of a retaining member and a bolt,
The restraining member is fixed to the segment by tightening the bolt in the insert embedded in the segment,
A fixing jig for temporary internal support, wherein both ends of a flange surface of a beam member constituting the temporary internal support, which are in close contact with each other along the inner surface of the segment, are hooked by the pressing members facing each other.

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