JP2011099228A - Method of compacting crest part of tunnel lining - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a method of compacting the crest part of a tunnel lining capable of improving construction quality by properly compacting the crest part of the tunnel lining. <P>SOLUTION: Vibrator insertion holes 10 are formed at any positions of a crest part form (center crown 24) or in inspection window parts 30 provided in the crest part form (center crown 24), and opening/closing covers are provided for opening/closing the vibrator insertion holes 10. After concrete is being placed or has been placed, a bar-like vibrator 40 is inserted into the concrete and the concrete is compacted while opening and closing the opening/closing door. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a tunnel lining top end compaction method, and in particular, a tunnel lining that can be suitably applied to both lap sections and emergency parking zone sections sandwiched between existing tunnel linings on both sides. It is related with the compaction method of the top end of the.

  Conventionally, in order to construct a tunnel lining, a formwork called a centle is installed inside the tunnel excavation surface, concrete is placed within the distance between the tunnel excavation surface and the formwork, and a vibrator is placed in the concrete. Was inserted and compacted. At this time, especially in the vicinity of the top end, a compaction method using a so-called extraction vibrator system is performed in order to prevent the occurrence of cavities due to insufficient compaction and the occurrence of defective parts such as variations in strength. Has been developed (see Patent Document 1).

  In the concrete compaction method for tunnel lining described in Patent Document 1, guide means for guiding the power supply cable of the vibrator is provided on the end face of the existing tunnel lining, and the inside of the gap between the tunnel excavation surface and the formwork is provided. Before placing concrete on the guide means, a power supply cable is movably attached to the guide means, and the vibrator is disposed within the distance between the tunnel excavation surface and the formwork. And, by pulling out the vibrator and compacting the concrete supplied near the top end near the existing tunnel lining, the concrete placed near the top end can be compacted in a wide range. ing.

JP 2000-356099 A

  However, although the technique described in Patent Document 1 described above is an extremely useful method in the standard construction section, it is necessary to install a guide means for guiding the power supply cable, a winding device for the power supply cable, and the like. Because of this limitation, it could not be applied to both lap sections sandwiched between existing tunnel linings on both sides. These both lap sections are construction sections that occur when construction is performed after the boundary of the construction zone or when the wellhead is constructed after construction. Also, in the construction section where the tunnel cross-sectional area and construction length are different from the standard construction section, such as the emergency parking zone section, from the cost-effective relationship, compaction using a pulling vibrator system etc. is not performed Currently.

  For this reason, in compaction of the top ends in both lap sections, etc., concrete is compacted by inserting a rod-shaped vibrator from the inspection window provided in the top end formwork as needed. In a general compaction method, concrete is cast from the placement hole provided on the lap side of the standard construction section toward the wife side in the standard construction method. Since the inspection window portion of the tunnel is closed, there is a case where sufficient compaction cannot be performed in this portion, and there are cases where the workmanship is not good, for example, a striped pattern appears on the surface of the tunnel lining after construction.

  The present invention has been proposed in view of the above-described circumstances, and a tunnel capable of improving construction quality by appropriately compacting the top end portion of the tunnel lining in both lap sections and the like. The object is to provide a method for compacting the top end of the lining.

  The top end compaction method of the tunnel lining of the present invention has the following features in order to achieve the above-described object. That is, the top end compaction method of the tunnel lining of the present invention is an arbitrary position of the top end formwork installed inside the tunnel excavation surface or an inspection window provided in the top end formwork, An opening / closing lid for opening and closing the vibrator insertion hole is provided while opening the vibrator insertion hole. Then, during or after concrete placement, the vibrator is inserted into the concrete and compacted while opening and closing the opening / closing lid.

  In such a tunnel lining top end compaction method, a vibrator insertion hole is previously formed in the top end formwork (centre crown), and an opening / closing lid is provided in the vibrator insertion hole. In both lap sections and emergency parking zone sections, when the concrete cast on the top end portion is compacted, a vibrator is inserted into the mold frame and compacted while opening and closing the lid. At this time, by moving the vibrator in the entire circumferential direction of the vibrator insertion hole, the vicinity of the vibrator insertion hole can be uniformly compacted.

  In addition, the method of compacting the top end of the tunnel lining of the present invention is a dam that surrounds the periphery of the inspection window portion at both ends of both lap sections and emergency parking zone sections sandwiched between existing tunnel linings. Including a step of compacting the concrete while preventing the concrete from flowing out from the inspection window portion to the outside of the top end formwork when the concrete is placed with the member provided and the inspection window portion opened. preferable. Then, after the process is completed, the weir member is disassembled and taken out from the inspection window portion, the inspection window portion is closed, and the vibrator is inserted into the concrete while opening and closing the opening / closing lid of the vibrator insertion hole. To perform the compaction process.

  Furthermore, it is preferable that the weir member is formed so that the upstream side in the flow direction of the placed concrete is higher than the downstream side. In such a tunnel lining top end compaction method, the concrete cast from the existing tunnel lining flows toward the inspection window on the wife side, but this concrete is dammed by the dam member. .

  According to the tunnel lining top end compaction method of the present invention, the vibrator can be inserted into the concrete and compacted while opening / closing the opening / closing lid of the vibrator insertion hole provided in the centle crown. As a result, unlike the standard construction section, it is possible to perform sufficient compaction in both lap sections and emergency parking section sections where the normally used compaction method cannot be applied. Thus, no striped pattern or the like is generated, and the construction quality can be improved.

  In addition, a special device is not required when compacting, and it is only necessary to provide a vibrator insertion hole at an arbitrary position of the center crown or an existing inspection window portion, and the construction cost can be reduced.

  In addition, a dam member surrounding the inspection window is provided on both lap sections and emergency parking zone sections sandwiched between existing tunnel linings on both sides, and concrete is driven with the inspection window open. In the case where the step of installing is included, it is possible to reduce concrete leakage from the inspection window. Furthermore, by using a weir member formed so that the upstream side in the flow direction of the concrete to be placed is higher than the downstream side, by performing the compacting operation, the upstream of the inspection window portion where the concrete leakage is particularly noticeable. Since concrete can be dammed on the side, it is possible to further reduce concrete leakage more reliably.

The schematic sectional drawing of the tunnel which applies the top end part compaction method of the tunnel lining which concerns on embodiment of this invention. Explanatory drawing which shows the compaction range by a vibrator insertion hole and a rod-shaped vibrator. The side view (a) and top view (b) of an opening-and-closing lid. The perspective view of the dam member installed in the inside of a top end part formwork. Sectional drawing of the dam member installed in the inside of a top end part formwork.

<Outline of top end compaction method>
Embodiments of the tunnel lining top end compaction method of the present invention will be described below.
The top end compaction method of the tunnel lining according to the embodiment of the present invention is a method suitably applied to both lap sections and emergency parking zone sections sandwiched between existing tunnel linings on both sides. A vibrator insertion hole is opened at an arbitrary position of the top end formwork (centre crown) installed inside the tunnel excavation surface or an existing inspection window part provided on the top end formwork (centre crown). To do. Further, the vibrator insertion hole is provided with an opening / closing lid for opening and closing the insertion hole. The opening / closing lid is normally closed, and can be opened when the vibrator is inserted.

  In the present embodiment, a vibrator (for example, a rod-like vibrator) is inserted into the concrete and compacted while opening and closing the opening / closing lid during or after the concrete is placed. The weir that surrounds the inspection window when the concrete is placed with the inspection window open in both lap sections and emergency parking zone sections that are sandwiched between existing tunnel linings on both sides. By providing the members, the concrete being placed is prevented from flowing out of the inspection window portion to the outside of the top end formwork (centre crown).

  Next, with reference to the drawings, a tunnel lining top end compaction method according to an embodiment of the present invention will be described in detail. FIGS. 1 to 5 illustrate a method for compacting the top end of a tunnel lining according to an embodiment of the present invention. FIG. 1 is a schematic sectional view of the tunnel, and FIG. 2 is a tightening by a vibrator insertion hole and a rod-shaped vibrator. FIG. 3A is a side view of the opening / closing lid, FIG. 3B is a plan view of the opening / closing lid, FIG. 4 is a perspective view of the weir member, and FIG. 5 is a cross-sectional view of the weir member. .

<Centle (form for tunnel lining)>
To construct the tunnel lining, a centle (tunnel lining formwork) 20 as shown in FIG. 1 is used. The centle 20 is unique to the present invention in that the vibrator insertion hole 10 is provided, but other structures used for general tunnel lining work can be used. As shown in FIG. 1, a general centle 20 is used for placing concrete lining, supported by a main body carriage 21 that travels on rails laid in the direction of tunnel extension, and supported by the main body carriage 21. A steel mold 22 and a center jack 23 for setting the steel mold 22 at a construction position are main components. The length of the general centle 20 in the tunnel extending direction is about 10.5 m.

<Vibrator insertion hole>
As shown in FIG. 2, the centle crown (top end formwork) 24 of the present embodiment is provided with inspection window parts 30 for observing the concrete placement condition inside the formwork at appropriate intervals. Yes. The inspection window 30 includes a lid member 31, and one side of the lid member 31 is attached to the center crown 24 so as to be rotatable (see FIG. 5). Therefore, the inspection window part 30 can be opened and closed by rotating the cover member 31 with one side of the cover member 31 as a rotation fulcrum. In addition, in FIG. 2, the code | symbol 80 shows the existing concrete in both lap areas.

  A circular vibrator insertion hole 10 is opened in the inspection window 30 located at the top end. The size of a general inspection window 30 is about 450 mm × 550 mm. The vibrator insertion hole 10 has an inner diameter into which the rod-like vibrator 40 and the power supply cable 41 can be inserted. In the present embodiment, the vibrator insertion hole 10 has a diameter of about 10 cm. Instead of providing the vibrator insertion hole 10 in the inspection window 30, the vibrator insertion hole 10 may be provided at an appropriate position of the centle crown 24. Moreover, the shape of the vibrator insertion hole 10 is not limited to a circular shape, and may be a polygon such as a quadrangular shape, a hexagonal shape, or an octagonal shape, or other shapes.

  Since the reach distance of the rod-like vibrator 40 in one vibrator insertion hole 10 is about 2 m, when the centle 20 having a length in the tunnel extension direction of about 10.5 m is used, about four vibrators are inserted in the tunnel extension direction. What is necessary is just to provide the hole 10 (refer FIG. 2). Further, in the case of an emergency parking zone whose length in the tunnel extension direction is about 6.2 m, it is only necessary to provide about two vibrator insertion holes 10 in the tunnel extension direction.

<Open / close lid>
An opening / closing lid 50 is attached to the vibrator insertion hole 10. As shown in FIGS. 3A and 3B, the opening / closing lid 50 is made of a disk-shaped member that fits into the vibrator insertion hole 10, and the opening / closing lid 50 is pressed against the center crown 24 side. A pressing member 60 is attached. The pressing member 60 includes a support portion 61 provided on the center crown 24, an arm portion 62 that is rotatably attached to the support portion 61, a nut portion 63 provided at a distal end portion of the arm portion 62, and a nut portion And a holding screw 64 screwed to 63. Note that the shape of the opening / closing lid 50 is not limited to a disk shape, and may be an appropriate shape according to the shape of the vibrator insertion hole 10.

  In order to close the vibrator insertion hole 10, the opening / closing lid 50 is fitted into the vibrator insertion hole 10, and the arm portion 62 is rotated to a position where the holding screw 64 faces the opening / closing lid 50 with the support portion 61 as a rotation fulcrum. In this state, the holding screw 64 is rotated and the tip of the holding screw 64 is pressed against the opening / closing lid 50, thereby holding the opening / closing lid 50 in the vibrator insertion hole 10. On the other hand, to open the vibrator insertion hole 10, the holding screw 64 is rotated so that the tip of the holding screw 64 is separated from the opening / closing lid 50. In this state, the support portion 61 is used as a rotation fulcrum, and the arm portion 62 is rotated to a position where the holding screw 64 is removed from the opening / closing lid 50, and the opening / closing lid 50 is removed from the vibrator insertion hole 10.

<Weir member>
The weir member 70 is attached to the inside of the center crown 24 and surrounds the periphery of the inspection window portion 30, so that when the concrete 81 is placed with the inspection window portion 30 in the open state, the concrete 81 is removed from the inspection window portion 30. It is a member for preventing outflow. As shown in FIGS. 4 and 5, the dam member 70 is a pair of rod-like members 71 ((90 mm × 90 mm cross section (for example, thick end)) that spans the inspection window portion 30 in the tunnel extending direction. )), An upstream dam plate 72 that spans one side of both rod-shaped members 71, a downstream dam plate 73 that spans substantially the middle of both rod-shaped members 71, and the side surfaces of the pair of rod-shaped members 71. The upstream side weir plate 72 and the downstream side weir plate 73 include a pair of side surface weir plates 74. The upstream side or the downstream side is a direction with respect to the flow of the concrete 81 to be placed. The casting start side of the concrete 81 is the upstream side, and the wife side is the downstream side.

  In the dam member 70 of the present embodiment, the height of the upstream dam plate 72 is higher than the height of the downstream dam plate 73. Further, the height of the side dam plate 74 is inclined downwardly from the upstream dam plate 72 toward the downstream dam plate 73. As a result, the concrete 81 can be dammed particularly on the upstream side where leakage of the concrete 81 during placement becomes significant.

  In order to assemble the dam member 70, the rod-shaped member 71, the upstream dam plate 72, the downstream dam plate 73, the side dam plate 74, the inside of the center crown 24 from the inspection window portion 30 in which the lid member 31 is in the open state, And other members necessary for assembling the weir member 70 are carried in. Then, a pair of rod-like members 71 are spanned over the inspection window portion 30, and an upstream dam plate 72, a downstream dam plate 73, and a side dam plate 74 are attached to the rod-like member 71. On the other hand, the dam member 70 can be disassembled by removing the upstream dam plate 72, the downstream dam plate 73, and the side dam plate 74 from the rod-shaped member 71. The disassembled dam member 70 is taken out from the inspection window portion 30 in which the lid member 31 is in the open state. The dam member 70 is disassembled and taken out when the step of placing the concrete 81 is completed with the inspection window 30 opened. In the subsequent process, the inspection window 30 is closed, and the rod-like vibrator 40 is inserted from the vibrator insertion hole 10 and compacted.

<Vibrator>
The vibrator used in this embodiment is a rod-like vibrator 40 that is normally used for compacting the concrete 81. A flexible power supply cable 41 is connected to the rod-like vibrator 40. When the rod-like vibrator 40 is inserted into the concrete 81 from the vibrator insertion hole 10, the rod-like vibrator 40 hangs downward due to its own weight. By moving the rod-like vibrator 40 with the power supply cable 41, compaction can be performed over the entire circumference of the vibrator insertion hole 10. The vibrator used for compaction is not limited to the rod-shaped vibrator 40, and other shapes of vibrators may be used in accordance with the situation of the construction site.

  In addition, the expansion-contraction vibrator system is known as an existing technique. In this telescopic vibrator system, a vibrator attached with a hydraulic cylinder is attached to the opening provided in the centle, and by driving the hydraulic cylinder, the vibrator is inserted into the centre from the opening to compact the concrete. It has become. That is, in the conventional telescopic vibrator system, the vibrator simply advances and retreats linearly with respect to the concrete to be compacted, and in order to perform compaction over a wide range, a large number of openings are provided in the centle. It is necessary to attach a vibrator to each part. In contrast, the rod-like vibrator 40 used in the present embodiment can be clamped in a wide range around the vibrator insertion hole 10 by operating with the power supply cable 41. In this respect, the existing extension / contraction It is a different technology from the vibrator system. In the present embodiment, for example, by inserting one rod-like vibrator 40 from one vibrator insertion hole 10, compaction can be performed at a depth of about 2 m to 3 m over all directions around the vibrator insertion hole 10.

<Consolidation>
The present invention is preferably applied to both lap sections and emergency parking zone sections, and up to the vicinity of the top end portion, the concrete 81 is placed and compacted in the same manner as a conventional tunnel lining construction method. Do. Further, as described above, the rod-like vibrator 40 is inserted into the concrete 81 from the vibrator insertion port 10 and compacted on both ends of both lap sections and emergency parking zone sections sandwiched between the existing tunnel linings. In the previous process, the inspection window portion 30 is opened, and the weir member 70 is assembled around the inspection window portion 30 inside the center crown 24, and the concrete is placed and compacted.

  Then, in the vicinity of the top end where the concrete 81 should be placed with the inspection window 30 closed, the concrete 81 is placed inside the concrete 81 while opening and closing the opening / closing lid 50 during or after the concrete 81 is placed. Then, the rod-like vibrator 40 is inserted and compacted. At this time, in an appropriate work process, the weir member 70 is assembled in the vicinity of the inspection window 30 in the center crown 24 to prevent leakage of the concrete 81. In the compacting process, the power supply cable 41 of the rod-like vibrator 40 is held and the rod-like vibrator 40 is moved in the entire circumferential direction of the vibrator insertion hole 10 so that the vicinity of the vibrator insertion hole 10 is uniformly compacted. Thereafter, when the work process is close to completion, the weir member 70 is disassembled at an appropriate timing, the lid member 31 of the inspection window 30 is opened, and is taken out of the center crown 24.

  In an actual construction site, compaction with a depth of about 2 m to 3 m could be performed in all directions around the vibrator insertion hole 10. Furthermore, the quality of the tunnel lining can be further improved by pressing the vibrating portion of the formwork vibrator from the outer surface of the center crown 24 in a state in which the opening / closing lid 50 is closed, and tightening the periphery of the opening / closing lid 50. it can.

DESCRIPTION OF SYMBOLS 10 Vibrator insertion hole 20 Centle 21 Main body trolley 22 Steel formwork 23 Centle jack 24 Centle crown 30 Inspection window part 31 Cover member 40 Bar-shaped vibrator 41 Power supply cable 50 Opening and closing cover 60 Holding member 61 Support part 62 Arm part 63 Nut part 64 Holding screw 70 Dam member 71 Bar-shaped member 72 Upstream dam plate 73 Downstream dam plate 74 Side dam plate 80 Existing concrete 81 Concrete being placed

Claims (3)

A tunnel lining top end compaction method,
An opening / closing lid that opens a vibrator insertion hole and opens / closes the vibrator insertion hole at an arbitrary position of the ceiling end formwork installed inside the tunnel excavation surface or an inspection window provided in the ceiling end formwork Provided,
During concrete placement or after completion of placement, the vibrator is inserted into the concrete and compacted while opening and closing the lid.
A tunnel lining top end compaction method characterized by A dam member surrounding the inspection window is provided on both lap sections and emergency parking zone sections between both sides of the existing tunnel lining, and concrete is placed with the inspection window open. When performing, including the step of compacting while preventing the concrete from flowing out from the inspection window portion to the outside of the top end formwork,
After the process is completed, the weir member is disassembled and taken out from the inspection window portion, and the inspection window portion is closed, and the vibrator is inserted into the concrete while opening and closing the opening / closing lid of the vibrator insertion hole. And carry out the compacting process,
The tunnel lining top end compaction method according to claim 1. The dam member is formed such that the upstream side in the flow direction of the concrete to be placed is higher than the downstream side,
The method for compacting the top end of the tunnel lining according to claim 2.

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