JP4052002B2 - Notch construction method of bottom board joint position in underground wall - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a notch construction method for a bottom board joint position on an underground wall, for example.
[0002]
[Prior art]
When integrating the underground wall and the bottom plate by uneven connection, by forming a notch that becomes an uneven connection in advance at the bottom plate connection position at the bottom of the underground wall, then placing the concrete that will become the bottom plate underwater Then, the bottom base concrete goes around into the notch and is integrated.
[0003]
Conventionally, this notch has been formed by the following method.
(1) Insert a styrofoam block or box in the shape corresponding to the notch into the location corresponding to the notch, and place concrete in the underground wall side shaft. After the underground wall concrete is hardened, the bottom pit is excavated to expose these blocks or box and then removed.
(2) A boxing device is attached to a reinforcing bar or a steel core, and this boxing device is removed after placing concrete.
[0004]
[Problems to be solved by the invention]
However, in the ground with a high water pressure level, the excavation of the bottom pit after the construction of the underground wall is an underwater excavation because the underground wall is antagonized by the underground water pressure. Therefore, in the construction method (1), the removal work of the block or box and the cleaning work of the recessed portion formed thereafter are diving work in water, and the burden on the worker is great. In addition, in the construction method (2), it is inevitable that concrete wraps around between the wall surface of the underground wall and the boxing device, and it takes a lot of time to remove them. Therefore, compared with the removal method (1), There was an extra burden from diving work.
[0005]
The present invention has been made in order to solve the above-described problems, and its purpose is that there is no diving work associated with removal of the insertion material for forming irregularities, and cleaning work can be performed remotely from the ground. The method of notch construction of the bottom board joint position in the underground wall which was done is provided.
[0006]
[Means for Solving the Problems]
In order to achieve the above-mentioned object, the method of the present invention is a construction method in which a notch is formed in advance at the coupling position with the bottom plate on the bottom side surface of the underground wall, and the underground wall and the bottom plate are connected by unevenness by this notch, A notch forming means is incorporated in a reinforcing bar built in the vertical shaft that constitutes the underground wall, and this notch forming means is formed according to the notch shape of the bottom plate coupling position, and the opening surface is formed on the bottom plate side. A steel frame facing the surface, a water-impermeable biodegradable sheet covering the opening surface of the steel frame, and the sheet is filled inside to hold the sheet in an expanded state on the opening surface of the steel frame A biodegradable filler, and an injection pipe that penetrates through the steel frame and communicates its lower end with the interior of the seat and projects the upper end into the ground part. Injectable filler into the sheet and bulge the opening surface of the component frame After the concrete is placed and in close contact with the ground, the concrete is placed, and after the concrete is hardened, the biodegradation agent is injected into the sheet through the injection pipe, thereby biodegrading and extinguishing the filler and the sheet. The opening surface of the steel frame is opened toward the bottom plate side . Therefore, in the method of the present invention, the sheet and the filler forming the notch are naturally disappeared by the remote work from the ground part, so that the removal by the diving work can be omitted.
[0007]
Further, in the method of the present invention, after the disappearance of the sheet and the filler, a water jet is sprayed to the inside of the steel frame through the injection pipe to clean the inside of the steel frame, thereby making the steel after biodegradation. The inside of the frame can be cleaned remotely, and diving work for cleaning can also be omitted.
[0008]
Further, in the method of the present invention, the biodegradable sheet has a bag shape, and after the reinforcing bar is built, the biodegradable filler is injected and filled into the bag through the injection tube, so that the sheet is an opening surface of the steel frame. Since it bulges and adheres closely to the hole wall of the vertical shaft, it is possible to prevent the concrete from entering the opening surface side.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. 1, 2 (a) and 2 (b) show notch forming means used in the method of the present invention. This device 1 is a non-water-permeable bag made of a steel frame 3 assembled on the bottom side surface of a reinforcing bar 2 and a biodegradable sheet that is fixed inside the opening of the steel frame 3 and closes the opening surface. 4 and an injection pipe 5 whose lower end communicates with the opening side of the steel frame 3 and whose upper end passes through the inside of the reinforcing bar 2 and protrudes from the top.
[0010]
The steel frame 3 includes a top plate 3a, a side plate 3b integrated with a taper on both sides thereof, and a notch cross-sectional shape formed of a back plate 3c and a bottom plate 3d integrated on the back of the side plates 3b. The opening surface is directed to the bottom plate forming position side. The periphery of the distal end portion of the injection tube 5 passes through the upper part of the back plate 3c and is fixed by welding or the like, and communicates with a space formed between the bag body 4 and the opening.
[0011]
Then, as shown in FIG. 2B, the biodegradable gel 6 is injected and filled into the space through the injection pipe 5 when the underground wall described later is constructed. As a result, the bag body 4 expands and is made of steel. It protrudes to the opening surface of the frame 3 and closes the inside of the opening surface. In FIG. 2 (b), it is the hole wall of the vertical shaft that is in contact with the bag body 4, and the bag body 4 adheres along the uneven surface of the hole wall.
[0012]
The biodegradable sheet constituting the bag body 4 is, for example, Kanebo Synthetic Co., Ltd. Lactron (trade name) mainly composed of polylactic acid, and the biodegradable gel 6 as a biodegradable filler is, for example, A biodegradable plastic material such as KT gel (trade name) made by Keihin Soil Co., Ltd., which is mainly composed of cellulose, is processed into a bag-like sheet and a gel-like substance by secondary processing. When left untreated, the tissue is gradually degraded by underground microorganisms and disappears naturally. These materials also have the property of dissolving in the presence of alkali. Furthermore, when these materials are brought into contact with a biodegradable drug, for example, a drug containing bacteria for degrading, a devising agent, and the like, the decomposition action is accelerated at an early stage.
[0013]
In addition, in FIG. 1, although the case where the steel frame 3 was arrange | positioned only in one place on the bottom side surface of the reinforcing bar 2 is shown, in practice, a plurality of places are arranged in parallel at predetermined intervals, or the entire side surface is covered. It is also possible to provide the steel frame 3 and divide the bag body 4 into a plurality of locations inside the opening, and to arrange the injection tube 5 for each bag body 4 accordingly.
[0014]
FIG. 3 shows a construction procedure of the method of the present invention using the notch forming means 1 described above. First, as shown to (a), the apparatus 1 is located in the bottom board opposing position in the bottom part of the reinforcing bar 2 by constructing the reinforcing bar 2 which assembled | attached the apparatus 1 in the vertical shaft 7 filled with muddy water. . In this state, the injection tube 5 protrudes from the ground part.
[0015]
Next, the biodegradable gel 6 is injected and filled into the bag 4 from the ground through the injection tube 5, so that the bag 4 expands against mud pressure and adheres to the hole wall of the vertical shaft 7. Then, the periphery and the inside of the opening surface of the steel frame 3 are completely sealed.
[0016]
Next, as shown in (b), the underground wall 8 is completed by placing concrete in the vertical shaft 7 and replacing it with muddy water. By placing the concrete, the periphery of the bag body 4 becomes an alkaline atmosphere and gradually dissolves from the surface, but the shape is maintained until the concrete is solidified. In addition, it is also possible to inject and fill the biodegradable gel 6 into the inside of the bag body 4 after pouring the concrete by reversing the above order.
[0017]
After the concrete is solidified, by injecting the biodegradable agent described above through the injection tube 5, this agent permeates and disperses in each part of the gel 6, and as a result, the gel 6 is devisced and the bag 4 is contracted. . And by the action of this chemical, the gel 6 and the bag body 4 wrapping the surface of the gel 6 naturally disintegrate with time, dissolved and disappeared in the presence of alkali of the underground wall 8, and after being left for a predetermined period, As shown in (c), only the steel frame 3 is left on the bottom side surface of the underground wall 8, and the opening surface opens on the side surface of the underground wall 8.
[0018]
After that, as shown in (d), the bottom surface side vertical shaft 9 is excavated underwater by an ordinary method, so that the opening surface of the steel frame 3 is exposed to the vertical shaft 9 side. At this stage, the inside of the opening is cleaned by spraying a water jet into the inside of the steel frame 3 from the ground through the injection tube 5 and blowing away the bag 4 and the residue of the gel 6 accumulated at the bottom. . The presence or absence of exposure of the opening surface and the cleaning status of the cleaning surface can be confirmed with an underwater camera.
[0019]
Next, as shown in (e), concrete is poured in water to construct the bottom board 10. And the concrete of the edge part of the bottom board 10 goes around and fills the inside of opening of the notch formation means 1 or the steel frame 3, and the underground wall 8 and the bottom board 10 are integrated firmly by the uneven | corrugated coupling | bonding. After the concrete is hardened, draining water as shown in (f) completes an underground structure in which the underground wall 8 and the bottom board 10 are integrated.
[0020]
Further, as shown in FIGS. 4A and 4B, an attachment hardware 21 such as a gibber bar 20 and a gusset may be attached in advance to the inside of the steel frame 3. In this case, after the disappearance of the gel 6 and the bag body 4, the underground wall 8-the bottom plate 10 is obtained by connecting the gibber bars 20 and the mounting hardware 21 to the reinforcing bars, steel frames and the like arranged inside the bottom plate 10. The bond between them can be further strengthened.
[0021]
【The invention's effect】
As is clear from the above description, according to the notch construction method of the bottom board coupling position in the underground wall according to the present invention, there is no diving work associated with removal of the insertion material for uneven coupling, and cleaning work is also performed from the ground part. Can be done remotely.
[Brief description of the drawings]
FIG. 1 is a perspective view of notch forming means used in the method of the present invention.
FIGS. 2A and 2B are cross-sectional views showing a non-filled state and a filled state of a biodegradable gel in the same device.
FIGS. 3A to 3F are cross-sectional explanatory views showing a construction procedure of the present invention.
4A and 4B are cross-sectional views showing another embodiment of notch forming means. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Notch formation means 2 Reinforcing bar 3 Steel frame 4 Non-permeable bag body 5 made of biodegradable sheet Injection pipe 6 Biodegradable gel (biodegradable filler)
7 vertical shaft 8 underground wall 9 bottom plate side vertical shaft 10 bottom plate

Claims (3)

In the construction method in which a notch is formed in advance at the position of coupling with the bottom plate on the bottom side surface of the underground wall, and the underground wall and the bottom plate are unevenly connected by this notch,
Incorporating notch forming means into the reinforcing bars built in the vertical shaft that constitutes the underground wall,
This notch forming means is formed according to the notch shape of the bottom plate coupling position, and has a steel frame whose opening surface faces the bottom plate side, and a water-impermeable biodegradable covering the opening surface of the steel frame. A sheet, a biodegradable filler that holds the sheet in an expanded state on the opening surface of the steel frame by being filled inside the sheet, and the lower end of the steel frame is communicated with the inside of the sheet, And an injection tube with the upper end protruding above the ground,
The rebar is built in a vertical shaft, the biodegradable filler is injected into the sheet, the opening surface of the component frame is swelled and brought into close contact with the natural ground, and then concrete is cast, After hardening, the biodegradation agent is injected into the sheet through the injection tube to biodegrade and disappear the filler and the sheet, and the opening surface of the steel frame is opened toward the bottom plate side. The notch construction method of the bottom board joint position in the underground wall which characterizes. 2. The inside of the steel frame is cleaned by spraying a water jet to the inside of the steel frame through the injection pipe after the biodegradable sheet and the biodegradable filler are extinguished. Cutout method of bottom plate joint position on the underground wall of the ground. The bottom plate in the underground wall according to claim 1 or 2, wherein the biodegradable sheet is formed in a bag shape, and the biodegradable filler is injected and filled into the bag through an injection pipe after the reinforcement is built. Notch construction method at the joint position.

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