JPH05133199A - Installing method of waterstop - Google Patents

Abstract

PURPOSE:To prevent the deformation of a waterstop on the arch side by external stress such as the fluid pressure and buoyancy and the like of concrete at the time of the placing of concrete in an arch section by a fixture while drawing the fixture without deforming the waterstop during the placing of concrete, and to flow concrete naturally into said drawing hole section and block the hole section in the installing method of the waterstop mounted to the jointing of successive pours of concrete of the arch section and invert section of tunnel lining concrete. CONSTITUTION:A block (c) for a ruler is laid along the external surface of the leg section of an arch section B, a waterstop (b), to which fixtures (a) are annexed under the state, in which the fixtures are held at regular intervals in the longitudinal direction previously, is placed on the block (c) while an arch type frame (d) is built onto the block (c), and the arch-side carrying-out section of the waterstop (b) is supported by the arch type frame (d), the block (c) and the fixture (a). The fixtures (a) are extracted while selecting the state, in which external stress such as the fluid pressure, buoyancy, etc., of concrete in the periphery of the waterstop (b) is balanced, during the placing of concrete in the arch section B.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of installing a water stop plate to be installed in a concrete splicing portion of an arch portion and an invert portion of tunnel lining concrete.

[0002]

2. Description of the Related Art Conventionally, a method of installing a water stop plate for a concrete splicing part of a tunnel lining concrete arch part and an invert part is such that concrete is placed before the arch part of the tunnel. A wooden rootstock is installed along the outer surface of the leg, and the widthwise half of the waterstop board is taken out from the side of the footstock to the arch side. The remaining half of the waterstop board is placed on the rootstock and nailed. After temporarily fixing it with, etc., form the arch formwork on the basestock, and sandwich the waterstop plate between the basestock and the formwork so that the widthwise center part of the waterstop plate on the arch side is one side. Then fix it and place concrete in the arch. Next, after the concrete in the arch portion has hardened, the formwork and rootstock of the arch portion are dismantled, and the remaining half of the water blocking plate is carried out to the invert side, and the concrete in the invert portion is placed, whereby the tunnel arch A water stop plate is installed at the splice part between the invert and invert parts.

[0003]

In the conventional method of installing the water stop plate on the arch side, since the water stop plate is supported in the state of a cantilever whose half in the width direction is brought out substantially horizontally to the arch portion,
When the casting height of concrete is high like the arch part, the arch-side tip of the water stop plate is bent upward or the longitudinal direction is wavy due to large external stress such as concrete flow pressure and buoyancy. It transforms by doing. For this reason, there are problems that bubble nests and a concrete separation layer are formed in the deformed portion of the water blocking plate, leading to a reduction in structural strength of the splicing portion and a reduction in water blocking ability. The present invention has been proposed in view of the above problems of the prior art, and an object thereof is to stop the arch side due to external stress such as fluid pressure or buoyancy of concrete when concrete is cast in the arch portion. Preventing the water plate from being deformed by the fixed metal fitting, the fixed metal material is pulled out without deforming the water stop plate during concrete pouring, and the concrete is allowed to naturally flow into the extraction hole to block it. The point is to provide a method of installing the plate.

[0004]

DISCLOSURE OF THE INVENTION The present invention has achieved the above object in a method of installing a water stop plate to be installed at a concrete splicing portion of an arch portion and an invert portion of tunnel lining concrete. Therefore, laying a rootstock for fixed trees along the outer surface of the legs of the arch portion, while mounting a water stop plate attached with a fixed hardware in a state of being sandwiched in advance in the longitudinal direction at a predetermined interval, An arch frame is erected on the rootstock, and the arch-side carry-out portion of the water stop plate is supported by the arch frame, the rootstock, and a fixed hardware. Then, while placing the concrete in the arch portion, the fixed hardware is pulled out while observing the state where the external stress such as the flow pressure and buoyancy of the concrete around the water stop plate is balanced. The fixed hardware is composed of a pair of holding pieces for holding the water stop plate, a pulling piece for pulling out the main body, and a mounting member for fixing to the base. Then, the bent portion of the sandwiching piece and the pull-out piece were welded.

[0005]

According to the present invention, when the water stop plate is installed on the arch side, the take-out portion of the water stop plate which is brought out substantially horizontally to the arch side by the arch frame, the base and the fixed hardware is sandwiched by three sides. By wearing it, the longitudinal direction of the water stop plate is fixed hardware and has a short span of 2
The sides are fixed, and one side of the central portion in the width direction of the water blocking plate is fixed, and structurally, the take-out portion of the water blocking plate forms a three side fixing plate. Therefore, deformation of the water stop plate due to external stress such as concrete flow pressure and buoyancy at the time of placing concrete in the arch portion is supported in the state of three side fixing plate, so it is much larger than that of the conventional takeout beam. Can be reduced to. In addition, during casting of the concrete in the arch part, the fixed metal parts are pulled out in anticipation of the external stress such as the flow pressure and buoyancy of the concrete around the water stop plate, so that the water stop plate is not deformed. Concrete naturally flows into the cavity of the fixed metal object that was inserted in the part and closes the extraction hole.

[0006]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the water blocking plate according to the method of the present invention will be described with reference to the drawings. FIG. 1 is a transverse cross-sectional view showing a cross section of the tunnel lining concrete A, showing a state in which a water stop plate b is installed at the concrete joints of the arch portion B and the invert portion C. In the step of installing the water blocking plate b, the water blocking plate b on the arch side is mounted in advance in order to pour concrete ahead of the arch portion of the tunnel. 2, 3
FIG. 3 is an enlarged cross-sectional view of an essential part showing an embodiment in which a water stop plate b is installed on the arch side and a perspective view showing a state in which a water stop plate is laid on a rootstock. In order to drive, the root c is laid along the outer surface of the leg of the arch portion B. In order to install the fixed hardware a on the base c at intervals (usually 30 cm pitch) at which the water blocking plate b will not be deformed by external stress such as flowing pressure and buoyancy of concrete at the time of placing concrete, holding pieces at the same intervals. The groove where 1'is completely buried is carved. Then, the water blocking plate b is previously sandwiched by the sandwiching pieces 1, 1'of each fixed metal a at the above intervals,
In this state, the water blocking plate b is laid on the base c, and nails 4 are driven from the nail holes 3a of the mounting member 3 of the fixed metal fitting to temporarily fix the base c. After that, an arch form frame d having a groove in which the sandwiching piece 1 is completely depressed is cut at the bottom at the same interval as the installation interval of the fixed hardware a, and the fixed hardware a is attached by the same frame d and the root c. The water blocking plate b is sandwiched. Next, concrete is poured into the arch portion B by a concrete pump. During concrete pouring of the arch part B, external stress such as flow pressure and buoyancy of the concrete around the water stop plate b acting on the water stop plate b is balanced, that is, the top of the concrete is approximately 1 m from the water stop plate b. At a time when it reaches the highest position, pull out the nail 4 driven into the nail hole 3a of the mounting member 3, insert an iron rod or the like into the opening 2a of the pulling piece 2, and pull the fixed metal a by the lever principle. Pull out. Further, after the concrete in the arch portion B is hardened, the arch form d and the rootstock c are disassembled, the remaining half of the water blocking plate b is brought out to the invert side, and the concrete in the invert portion C is placed by a concrete pump. Then, a water stop plate b is installed at the joints of the arch portion B and the invert portion C of the concrete lining concrete A.

FIG. 4 is a perspective view showing an embodiment of a fixed metal a for a water blocking plate, wherein the pair of holding pieces 1, 1'for holding a water blocking plate b made of synthetic resin have a fixed length. The steel bar is bent at the central bent portion 1a to have a substantially horizontal U-shape having a width substantially the same as the width of the water plate b and a distance between the sandwiching pieces 1 and 1'which is substantially the same as the thickness of the water stop plate b. The pull-out piece 2 for pulling out the main body is made of a square washer-shaped steel plate and has an opening 2a at the center. Mounting member 3 fixed to the rootstock c
Is a strip-shaped steel plate and has a nail hole 3a formed in the lower portion along the center line in the long side direction. Then, the central bent portions 1a of the sandwiching pieces 1 and 1'and the pull-out piece 2 are welded at centrally symmetrical positions on both upper surfaces along the center line in the long side direction of the mounting member 3 to sandwich the sandwiching pieces 1 and 1 '. The pull-out piece 2 and the pull-out piece 2 are integrated so as to project at a right angle from the mounting member 3.

The method of installing the water stop plate on the arch side is as follows. The half of the water stop plate b taken out substantially horizontally to the arch side by the arch frame d, the base c and the fixed hardware a is sandwiched by three sides. By doing so, the longitudinal direction of the water blocking plate b is fixed to two sides of the short span by the fixing hardware, and the width direction of the water blocking plate b is fixed to one side of the central part, so that the water blocking plate is structurally taken out. The part forms a three-sided fixed plate. Therefore, the deformation of the water blocking plate b due to external stress such as concrete flow pressure and buoyancy at the time of placing the concrete in the arch portion B is supported in the state of the three side fixing plate, so that it is compared with the state of the conventional take-out beam. It is possible to significantly reduce it.
The water blocking plate b on the invert side is flat even in the conventional method and has a low concrete pouring height, and external stress such as flow pressure and buoyancy of the concrete is small, so that the water blocking plate b is slightly deformed, Even if there is deformation, the deformation of the water blocking plate b can be corrected while pouring concrete. Further, the fixed hardware a supporting the arch-side water stop plate b is the arch portion B.
Of the arch part without deforming the water blocking plate b by extracting the water blocking plate b while the external stress such as the flow pressure and buoyancy of the concrete acting around the water blocking plate b during the concrete pouring is balanced out. Concrete naturally flows into the pull-out holes of the sandwiching pieces 1 and 1'inserted in B and is closed.

[0009]

According to the present invention, when the water blocking plate is installed on the arch side, the width half of the water blocking plate taken out substantially horizontally on the arch side by the arch frame, the rootstock and the fixed hardware is set to three. By sandwiching the sides, structurally, the take-out part of the water blocking plate forms a three side fixing plate, so that the water blocking plate due to external stress such as concrete flow pressure and buoyancy at the time of placing concrete in the arch part The deformation is supported in the state of the three-side fixing plate, and is greatly reduced as compared with the state of the conventional take-out beam. Therefore, to provide a concrete splicing part for the arch part and the invert part of the tunnel lining concrete that keeps the position of the water stop plate accurately, has few bubble nests and concrete separation layer, and is structurally stable and has high water stop. Is possible. In addition, during casting of concrete in the arch part, the fixed hardware is pulled out in anticipation of the external stress such as the flow pressure and buoyancy of the concrete around the water stop plate, so that the water stop plate is not deformed. Concrete naturally flows into the cavity of the fixed metal object inserted in the part and closes the extraction hole. Therefore, the filling operation is not necessary and the water blocking property is not hindered.
Further, since the fixed metal piece is a simple material and has a shape, it can be manufactured at low cost, and can be diverted many times, which is economical.

[Brief description of drawings]

FIG. 1 is a transverse sectional view showing a section of tunnel lining concrete.

FIG. 2 is an enlarged sectional view of an essential part showing an embodiment in which a water blocking plate is installed on the arch side.

FIG. 3 is a perspective view showing an embodiment in which a water blocking plate is laid on a rootstock.

FIG. 4 is a perspective view showing an example of a fixed hardware.

[Explanation of symbols]

 a Fixed hardware b Water stop plate c Rootstock d Arch form frame 1 Clamping piece 1'Clamping piece 2 Extraction piece 3 Mounting member

Claims (2)

[Claims] 1. A method of installing a water stop plate to be installed in a concrete splicing portion of an arch portion and an invert portion of tunnel lining concrete, in which a rootstock for a constant tree is laid along an outer surface of a leg portion of the arch portion, The fixed hardware is fixed to the rootstock in a state in which the fixed hardware is sandwiched at predetermined intervals in the longitudinal direction of the water blocking plate in advance, and an arch frame is erected on the rootstock,
The arch side frame, rootstock and fixed hardware support the arch side carry-out part of the water stop plate, and during the concrete placement of the arch part,
A method of installing a water stop plate, characterized in that a fixed metal object is removed by observing a state where external stress such as flow pressure and buoyancy of concrete around the water stop plate is balanced. 2. The fixing hardware comprises a pair of holding pieces for holding a water blocking plate, a pulling piece for pulling out a main body, and a mounting member for fixing to a base. The holding piece and the pulling piece are provided on both sides of the mounting member. The method of installing the water blocking plate according to claim 1, wherein the water blocking plates are separately welded.