JP2008075254A - Intercepting device for invert concrete - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To effectively prevent a segment from rising by quickly intercepting an invert concrete when the invert concrete is placed. <P>SOLUTION: This intercepting device 1 for invert concrete placed at the bottom of a tunnel T comprises an intercepting frame 2 having an arcuate lower end outer periphery along an inner peripheral surface F at the bottom of the tunnel T, a carriage 3 supporting the rear of the intercepting frame 2 and movable on the inner peripheral surface F in the longitudinal direction of the tunnel T, and a fixing means for fixing the carriage 3 to the inner peripheral surface F at a predetermined position. The fixing means has a supporting frame 65 fixed to the segment S with a bolt screwed to a nut for filling a grout of the segment S forming the inner peripheral surface F. The carriage 3 is connected to the supporting frame 65 by an extensible bar jack 64. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a damming device used when placing invert concrete in tunnel construction.

In the tunnel shield method, waste is reduced by using earth and sand excavated by a shield machine as aggregate in invert concrete. In this case, after laying the segment on the inner circumference of the natural ground excavated by the shield machine, it is necessary to place invert concrete as soon as possible to prevent its lifting, etc. Acceleration is required. Patent Document 1 discloses a cutting apparatus that can quickly perform invert cutting work of a tunnel.
JP-A-8-218776

  However, conventionally, the weir when placing invert concrete is based on a method of assembling a wooden weir frame each time, so that there is a problem that it is difficult to respond quickly.

  Accordingly, the present invention is to solve such problems, and an object thereof is to provide an invert concrete damming device that can quickly prevent damming when placing invert concrete and effectively prevent the lifting of the segment. To do.

  To achieve the above object, according to the first aspect of the present invention, there is provided an invert concrete weiring device (1, 7) placed on the bottom of the tunnel (T), the inner peripheral surface (F) of the bottom of the tunnel (T). ) Along the arcuate lower end of the dam frame (2, 71) and the back of the dam frame (2, 71) supporting the inner peripheral surface (F) in the longitudinal direction of the tunnel (T) A movable carriage (3, 8), and fixing means (64, 65, 72) for fixing the weir frame (2, 71) or the carriage (3, 8) to the inner peripheral surface (F) at a predetermined position; It has. Here, the term “invert concrete” is intended to broadly include invert backfill materials.

  In the first invention, after the weir frame is moved to a desired position by the carriage, the anchor frame or the carriage is fixed to the inner peripheral surface of the tunnel bottom by the fixing means, so that Damping that can withstand the load can be performed quickly.

  In the second aspect of the invention, the fixing means is fixed to the segment (S) by a bolt (67) screwed into a grout injection nut (66) of the segment (S) constituting the inner peripheral surface (F). A frame (65) is provided, and a carriage (3) is connected to the receiving frame (65) by an extendable rod jack (64).

  In the second aspect of the invention, the receiving frame is fixed to the segment using the grout injection nut, and the rod jacks are appropriately expanded and contracted in accordance with fluctuations in the relative distance between the fixed receiving frame and the carriage to connect the two. As a result, the carriage can be quickly and reliably fixed to the segment.

  In the third aspect of the invention, the fixing means includes a receiving beam (72) protruding from the damming frame (71), and the receiving beam (72) constitutes an inner peripheral surface (F). The trolley (8) is provided with a pallet truck (82) or a self-propelled device for conveying the damming frame (71).

  In the third aspect of the invention, the dam frame can be easily and easily moved using a pallet truck or a self-propelled device, and after movement, the receiving beam is fixed to the bolt using a grout injection nut. By doing so, the blocking frame can be securely fixed to the segment.

  In addition, the code | symbol in the said parenthesis shows the correspondence with the specific means as described in embodiment mentioned later.

  As described above, according to the invert concrete damming apparatus of the present invention, it is possible to quickly prevent damming when placing the invert concrete and effectively prevent the segment from being lifted.

(First embodiment)
FIG. 1 shows a cross section of a lower half portion of a tunnel excavated by a shield method or a propulsion method, and FIG. 2 shows a vertical cross section thereof. Along the inner peripheral surface of the tunnel T excavated in a circle by the shield machine, a number of segments S having a constant thickness and an appropriate shape are connected to each other by a known method to form a primary lining surface F. ing. Invert concrete is placed on the bottom of the primary lining surface F of the tunnel T through which the shield machine has passed and the segment S is laid, using a weir device 1 described below. In FIG. 2, the code | symbol C is existing invert concrete, has a flat upper surface on the primary lining surface F, and is formed by fixed height. The damming device 1 is positioned at a predetermined distance from the existing invert concrete (hereinafter referred to as existing concrete) C to the shield machine side (right side in FIG. 2). Then, new inverted concrete is placed in the space Sp between the end face of the existing concrete C and the damming frame 2 of the damming device 1 facing substantially parallel thereto. In FIG. 1 and FIG. 2, symbol B is a temporary sleeper made of H-shaped steel constructed between the inner peripheral side surfaces of the primary lining surface F in order to support rails for work vehicles.

  The dam frame 2 is a vertically divided plate body, and the upper plate 21 and the lower plate 22 are coupled by a hinge mechanism 23, and the upper plate 21 is moved backward by a bar jack 51 disposed between the carriage 3. It can be tilted. The upper plate 21 can be tilted forward (the chain line in FIG. 2). In the state where the upper plate 21 is erected, the weir frame 2 becomes almost the same height as the existing concrete C, and the overall shape thereof is the inner peripheral surface of the segment S at the bottom end of the tunnel T, that is, the primary covering. In addition to the arc shape along the work surface F, the upper end surface is a straight line crossing the tunnel T space. In addition, an air-filled seal tube 24 is attached to the outer periphery of the damming frame 2 to prevent the leakage of invert concrete, and this is in close contact with the primary lining surface F.

  The lower plate 22 of the weir frame 2 is supported by the carriage 3 in the back. The carriage 3 is a combination of beams, and has a lower beam 31 that curves downward and a horizontal upper beam 32 in a front view (FIG. 1), and a plurality of vertical beams 33 are connected at intervals. is doing. The cart 3 has a rectangular shape with an oblique beam 34 in a side view (FIG. 2), and one end of the upper beam 35 and the lower beam 36 is fixed to the back surface of the lower plate 22 of the blocking frame 2. A counterweight 37 in which a container is filled with concrete is provided at the center of the top of the carriage 3, and support beams 38 and 39 (only one is shown in FIG. 1) extending horizontally in the tunnel width direction are provided below the counterweight 37. It is arranged.

  Support legs 40 are provided at both ends of each of the support beams 38 and 39 toward the primary lining surface F, and a front tire 41 and a rear tire 42 are rotatably mounted thereon (FIG. 2). Among these, the left and right rear tires 41 are connected to a motor 43 and driven to rotate. By rotating the rear tire 41 forward and backward, the weiring device 1 is moved forward and backward on the primary lining surface F in the longitudinal direction of the tunnel while being supported by the front and rear tires 41 and 42.

  A lifting jack 61 is suspended from the lower end of the bracket at the lower left and right positions of the front and rear support beams 38 and 39, and a transverse jack 62 is provided below the lifting jack 61. A leg plate 63 projects from the lower surface of the transverse jack 62 toward the primary lining surface F. One end of a bar jack 64 is connected to the lower end of each vertical beam 33 of the carriage 3, each bar jack 64 extends forward in the longitudinal direction of the tunnel T, and the other end is coupled to the receiving frame 65. The receiving frame 65 is formed by bending U-shaped steel into an arc shape along the primary lining surface F (see FIG. 1), and the other end of the bar jack 64 is coupled to the rear side surface of the receiving frame 65.

  As shown in FIG. 3, the receiving frame 65 is fixed to each segment S by bolts 67 screwed into the grout injection nuts 66 of the segments S constituting the primary lining surface F at a plurality of locations in the longitudinal direction of the bottom wall. Has been. One end of a suitable number of jack jacks 68 (FIG. 2) is connected to the front side of the receiving frame 65, and the other ends of these jack jacks 68 formed in a U-shape are provided in other segments S as shown in FIG. The bolt 67 is engaged with the rod-shaped portion 671 of the bolt 67 from the rear. Note that a work table 44 having a ladder and a handrail is provided on the carriage 3.

 In the case of placing invert concrete with the damming device 1 having such a structure, the front tire 41 is rotationally driven by the motor 43 while the upper plate 21 of the damming frame 2 is tilted forward, and the damming is performed. The frame 2 is positioned at a predetermined forward position with respect to the existing concrete C as shown in FIG. Thereafter, the upper plate 21 is erected and the lifting jack 61 is extended to bring the leg plate 63 into pressure contact with the primary lining surface F, thereby positioning the carriage 3 and the dam frame 2 in the longitudinal direction of the tunnel T. In this state, the carriage 3 and the weir frame 2 are positioned and adjusted in the width direction of the tunnel T by the transverse jack 62. Next, the bar jack 64 is expanded and contracted, the receiving frame 65 is moved in the front-rear direction, and the mounting hole 651 (FIG. 3) is made to coincide with the female thread portion of the nut 66 of the segment S. Then, a bolt 67 is screwed into the nut 66 to fix the receiving frame 65. Further, if necessary, a rod jack 68 (FIG. 2) extending forward from the receiving frame 65 is appropriately expanded and contracted, and its tip is engaged with a rod-shaped portion 671 of a bolt 67 (FIG. 4) attached to the segment S from the rear. Combine.

  In this state, when new invert concrete is placed in the space Sp between the existing concrete C and the weir frame 2, the placed concrete is stored in the space Sp without leaking by the weir frame 2. At this time, a large load of the placed concrete is applied to the damming frame 2, which is received from the carriage 3 via the bar jack 64 by the receiving frame 65 fixed to the segment S. The concrete load is also received by the bolt 67 of the segment S via the bar jack 68 if necessary.

  As described above, the damming device 1 according to the present embodiment quickly moves on the inner peripheral surface of the tunnel after the primary lining, positions the damming frame 2 at a predetermined position, and loads the newly injected invert concrete. Can be surely received, enabling a quick concrete placing operation and effectively preventing the segment S from being lifted.

  In addition, when damage such as perforation occurs in the seal tube 24 that is in close contact with the primary lining surface F on the outer periphery of the lower plate 22 of the damming frame 2, an example is taken to prevent leakage of the placed invert concrete. As shown in FIG. As shown in FIG. 5, an L-shaped auxiliary pressing metal fitting 102 having a vertical wall and a horizontal wall is positioned behind the seal tube 24, and the seal tube 24 is backed by sponge rubber 101 adhered to the surface of each wall. The lower gap of the lower plate 22 is sealed. The back of the auxiliary presser fitting 102 is supported by a bar jack 100.

(Second Embodiment)
FIG. 6 shows a rear view of the weir device 7 installed in the lower half of the tunnel T excavated by the shield method, and FIGS. 7 and 8 show the lines VII-VII and VIII-VIII in FIG. 6, respectively. FIG. The damming device 7 includes a damming frame 71, and the damming frame 71 has a circular arc shape along the inner circumferential surface of the segment S disposed at the bottom of the tunnel T, that is, the primary lining surface F. The upper end surface is a straight line that crosses the tunnel space. On the outer periphery of the lower end of the weir frame 71, receiving beams 72 made of U-shaped steel project forwardly at a plurality of locations at intervals in the circumferential direction (FIG. 8), and are provided on the bottom wall of these receiving beams 72. Bolts 73 (FIG. 9) inserted through a plurality of mounting holes 721 are screwed into grout injection nuts 74 embedded in the segment S constituting the primary lining surface F to receive beams 72, that is, weir frames 71. Is fixed to the segment S.

  A pair of U-shaped steels, which are spaced downward at a certain distance above and parallel to the primary lining surface F and extend downward, extend forward as main beams 75 at the left and right positions of the central portion of the weir frame 71 (see FIG. 7). The main beam 75 is provided with a leg arm 751 which can be rotated in a tilted state (the state shown in FIG. 7) and a standing state at the base end portion, and a caster 752 is attached to the tip of the leg arm 751. An oblique beam 76 is installed between the main beam 75 and the damming frame 71, and a counterweight 81 is placed on the rear end portion of the main beam 75. Further, a fork 821 of the pallet truck 82 is inserted below the main beam 75. Such a main beam 75, an oblique beam 76, casters 752 and a pallet truck 82 constitute a carriage 8.

  In the right half of the front surface of the weir frame 71, sub beams 77 extending forward from the front surface are provided at two locations in the width direction of the tunnel T (FIG. 8), and between each sub beam 77 and the weir frame 71. An oblique beam 78 is installed. Further, leg beams 771 that protrude toward the primary lining surface F and abut against the primary lining surface F are provided on the lower surfaces of the distal ends of the sub beams 77.

  When such a damming device 7 is used, the damming frame 71 is lifted by the pallet truck 82 via the main beam 75. Then, the leg arm 751 is turned upright to cause the caster 752 to protrude onto the primary lining surface F below the main beam 75. In this state, after the weir frame 71 is moved to an appropriate position, the leg arm 751 is tilted to raise and retract the casters 752, and the weir frame 71 is lowered by the pallet truck 82. Thereby, the outer periphery of the lower end of the damming frame 71 is in contact with the primary lining surface F. Thereafter, the damming frame 71 is fixed to the segment S via the beam 72.

  When new invert concrete is placed in the space between the existing concrete C (see FIG. 2) and the dam frame 71, the placed concrete is stored in the space without leaking by the dam frame 71. At this time, a large load of the placed concrete is applied to the damming frame 71, which is received by the receiving beam 72 fixed to the segment S. The effect similar to 1st Embodiment can be acquired also by the damming apparatus 7 of this embodiment.

  In addition, the said dam frame 71 may be used together with the dam frame 1 of 1st Embodiment as an apparatus on the safety management at the time of construction. In this case, when placing new inverted concrete with the damming frame 1, the damming frame 71 is positioned closer to the tunnel face than the rod-shaped portion 671 of the bolt 67 (see FIG. 4). Thereby, even if the dam frame 1 collapses and the concrete flows out at the time of placing, it functions as a safety device that can be dammed by the dam frame 71. In such an implementation, in consideration of safety in traffic when the worker goes to the construction site of the weir frame 1, as shown in FIG. 8, it is strengthened by the secondary beam 77, the diagonal beam 78, and the leg beam 771. The work staircase 9 is installed on the right half of the damming frame 71, with the top portion 91 positioned so as to descend forward and rearward of the damming frame 71.

  In the first embodiment and the second embodiment, in the shield method, the earth and sand excavated by the shield machine is described as being used as aggregate in the invert concrete, but tunnel excavation methods other than the shield method and other It may be a tunnel machine.

It is a lower half cross section of the tunnel excavated with the shield construction method in 1st Embodiment of this invention. It is a lower half longitudinal cross-sectional view of the tunnel excavated by the shield method. It is a vertical sectional view of a receiving frame fixing part. It is a vertical sectional view of a bar jack locking part. It is an enlarged vertical sectional view of the lower part of the lower plate of the weir frame. It is a rear view of the damming apparatus installed in the lower half part of the tunnel excavated by the shield method in 2nd Embodiment of this invention. FIG. 7 is a vertical sectional view taken along line VII-VII in FIG. 6. FIG. 7 is a vertical sectional view taken along line VIII-VIII in FIG. 6. It is a vertical sectional view of a receiving beam fixing part.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Damping device, 2 ... Damping frame, 3 ... Bogie, 41, 42 ... Tire, 64 ... Bar jack (fixing means), 65 ... Receptacle frame (fixing means), 7 ... Damping device, 71 ... Damping Frame, 72 ... receiving beam (fixing means), 8 ... bogie, F ... primary lining surface (inner peripheral surface), T ... tunnel.

Claims (3)

An invert concrete damming device placed at the bottom of a tunnel, comprising a damming frame having an arcuate lower end outer periphery along the inner peripheral surface of the tunnel bottom, and supporting the rear of the damming frame An invert concrete damming device comprising: a carriage movable on a circumferential surface in a tunnel longitudinal direction; and a fixing means for fixing the damming frame or the carriage to the inner circumferential surface at a predetermined position. The fixing means includes a receiving frame fixed to the segment by a bolt screwed into a grout injection nut of the segment constituting the inner peripheral surface, and the cart can be extended and retracted to the receiving frame. The invert concrete damming device according to claim 1, which is connected by The fixing means includes a receiving beam protruding from the damming frame, and the receiving beam is fixed to a segment constituting the inner peripheral surface, and the carriage transports the damming frame. Alternatively, the invert concrete damming device according to claim 1, further comprising a self-propelled device.

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