Caisson support structure and caisson construction method

Abstract

To provide a support structure of a caisson and a construction method of the caisson, capable of reducing construction cost, while securing work safety of a worker.SOLUTION: In the support structure of the caisson, which is interposed between the roof slab 5 of the working room of the caisson skeleton and the subsoil 6 thereunder and supported by the saddle 7 so as to prevent the caisson skeleton from being inclined or so as to correct the inclination of the caisson skeleton, the saddle 7 is formed by stacking a plurality of sets of foamed-resin blocks 8 composed of foamed-resin materials from the subsoil 6 to a height reaching the roof slab 5.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a support structure using sandles made of foamed resin blocks and a method for constructing a caisson using the support structure. [Background technology]

[0002] Conventionally, in the caisson construction method, as a measure to prevent uneven settlement of the caisson in the ground layer, steel or wooden sandals have been placed between the ceiling slab of the workroom of the caisson body and the ground below to prevent the caisson body from tilting or to correct the tilt of the caisson body. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 10-37203 [Patent Document 2] Japanese Patent Application Publication No. 2024-33824 Summary of the Invention [Problem to be solved by the invention]

[0004] For example, Patent Document 1 discloses a sandle with a cutting edge made of steel.

[0005] Furthermore, Patent Document 2 discloses a wooden sandle.

[0006] However, the steel sandole with cutting edge in Patent Document 1 and the wooden sandole in Patent Document 2 are heavy, and there is a problem that assembling and disassembling them every time the caisson is lowered is dangerous if it accidentally falls. Also, constructing a caisson using the steel sandole with cutting edge in Patent Document 1 or the wooden sandole in Patent Document 2 is hard work, which takes time and increases labor costs and construction costs.

[0007] For example, a typical wooden sandle is made of cedar, and is a square timber measuring 90mm x 90mm x 1000mm and weighing approximately 4kg. When using multiple square timbers (sandles), 5 to 10 timbers (the number varies depending on the site) are arranged widthwise in one layer, and by stacking them vertically in a grid pattern so that their longitudinal directions are perpendicular to each other, sandles of any desired height can be installed. If the sandle installation height is 2m, there will be more than 20 layers, and if 10 timbers (sandles) are lined up in one layer, the weight of each sandle will be more than 800kg.

[0008] Thus, even with wooden sanders, the problem of hard work for workers and danger if they accidentally fall has not been solved.

[0009] The present invention was made in consideration of the above-mentioned problems, and its purpose is to provide a caisson support structure and a caisson construction method that ensures the work safety of workers while also reducing construction costs. [Means for solving the problem]

[0010] The caisson support structure of the first invention is a caisson support structure that is interposed between the ceiling slab of the working room of the caisson body and the ground below it, and is supported by sandals to prevent the caisson body from tilting or to correct the tilt of the caisson body, and is characterized in that the sandals are made of multiple sets of foamed resin blocks made of foamed resin material stacked up to a height that reaches from the ground to the ceiling slab.

[0011] The caisson support structure of the second invention is characterized in that, in the first invention, the sandle is a polystyrene sandle made by combining multiple polystyrene foam blocks made of rectangular pillar-shaped polystyrene foam.

[0012] The caisson construction method of the third invention is a caisson construction method in which a caisson is constructed while being supported by sandals so that the caisson body does not tilt or so that the tilt of the caisson body is corrected, and is characterized by using the caisson support structure described in the first or second invention. [Effects of the Invention]

[0013] According to the first to third inventions, it is possible to realize a caisson support structure and a caisson construction method that ensures the work safety of workers and also reduces construction costs. [Brief explanation of the drawings]

[0014] [Figure 1] FIG. 1 is a cross-sectional view of a caisson support structure showing an embodiment of the present invention. [Figure 2] FIG. 2 is a diagram showing an example of the foamed resin block of FIG. [Figure 3] FIG. 3 is an enlarged view of the polystyrene foam sandle in the embodiment of the present invention of FIG. DETAILED DESCRIPTION OF THE INVENTION

[0015] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, exemplary embodiments of the present invention will be described with reference to the accompanying drawings.

[0016] First, a caisson support structure showing an embodiment of the present invention will be described with reference to Figs. 1, 2 and 3.

[0017] Figure 1 is a vertical cross-sectional view of a caisson support structure showing an embodiment of the present invention, Figure 2 is a diagram showing an example of a foamed resin block 8 of Figure 1, and Figure 3 is an enlarged view of a sander 7 in the embodiment of the present invention of Figure 2.

[0018] As shown in Figure 1, the lower part of the caisson body 2 in the caisson construction method to which the present invention is applied has a cutting edge 3, and is provided with a caisson support structure 1 interposed between the ceiling slab 5 of the workroom 4 and the ground 6 below it, and supported by sandles 7 to prevent the caisson body 2 from tilting or to correct any tilt of the caisson body. The caisson body 2 is a caisson used in the caisson construction method and pneumatic caisson construction method, and is a reinforced concrete structure that is mainly composed of a circular or rectangular shape. The caisson body 2 shown in Figure 1 shows its vertical cross-sectional structure.

[0019] In the caisson support structure 1 of this embodiment, as shown in FIG. 1, multiple sandles 7 are provided to support the caisson body 2 so as to prevent it from tilting or to correct the tilt of the caisson body. Each sandle 7 is made up of multiple sets of foamed resin blocks 8 made of a foamed resin material stacked up to a height that reaches from the ground 6 to the ceiling slab 5, constituting the caisson support structure 1. An enlarged view of this sandle 7 is shown in FIG. 3. These sandles 7 are installed at regular intervals throughout the caisson body 2, but are omitted from FIG. 1. The sandles 7 in FIG. 1 are shown schematically and are not to scale with the actual caisson body 2.

[0020] The foamed resin block 8 is made of a foamed resin material. For example, as shown in FIG. 2, it may be made of a foamed polystyrene block made of expanded polystyrene in the shape of a rectangular column. Preferably, a large, hard foamed polystyrene block is suitable, since it supports the caisson body 2 so as to prevent it from tilting or to correct the tilt of the caisson body. Specifically, an EPS (Expanded Polystyrene) block (bead method foamed polystyrene), a urethane foamed resin block, or the like can be used. For example, the dimensions of the foamed resin block 8 can be 500 mm (width) x 500 mm (thickness) x 1000 mm (length). The unit weight of the foamed resin block 8 is 0.12 to 0.63 (kN / m 3 ), and that of lightweight aggregate is 3.5 to 8 (kN / m 3), the weight is considerably lighter than that of a conventional slab, which reduces the workload of workers and ensures their safety. In this embodiment, the unit weight is 0.20 (kN / m 3 ), compressive strength 100 (kN / m 3 ), allowable compressive stress 50 (kN / m 3 The foamed resin block 8 is used according to the construction site of the caisson method, and is not limited to the foamed resin block described above, and may be modified in design as appropriate.

[0021] The sandle 7 may be a polystyrene foam sandle made by combining a plurality of polystyrene foam blocks each having a rectangular column shape. 2 When installing a sander 7 with a height of 2 m, the desired sander can be installed by stacking four layers of foamed resin blocks of the above size in a grid pattern. 2 To install a 2-meter-high sander 7, two foam resin blocks of the above size are used, combining their long and short sides to form 1.5-meter steps, and four layers are stacked in a grid pattern to create the desired sander. Sander 7 can be constructed using the present invention, as long as it is larger than a wooden sander with a 90-cm square bead angle (wood) weighing approximately 4 kg per meter, but is within the maximum size of the foam resin block described above. In other words, if it is larger than a wooden sander with a 90-cm square bead angle (wood) but is within the maximum size of the foam resin block, it can reduce the number of worker steps, ensure worker safety, and reduce construction costs. If a sander for the caisson construction method is constructed using foam resin blocks larger than the maximum size of general-purpose foam resin blocks, the foam resin blocks must be custom-made, which increases material costs and construction costs. Using foam resin blocks within the maximum size of general-purpose foam resin blocks is effective in reducing construction costs.

[0022] The following describes a caisson construction method using the caisson support structure of the present embodiment using the sandle 7. This is a caisson construction method in which the caisson body 2 is constructed while being supported by the sandle 7 so as not to tilt or to correct the tilt of the caisson body, and the caisson is constructed using the caisson support structure using the sandle 7 described above.

[0023] The workers are in a workroom 7 and install sanders 7 by stacking multiple sets of foam resin blocks 8 up to a height that reaches from the ground 6 to the ceiling slab 5. As the excavation work of the caisson body 2 progresses, the workers will be required to assemble and remove the sanders 7 multiple times.

[0024] During the assembly and removal work, the foam resin blocks 8 that make up the sander 7 are lightweight, so even if the foam resin blocks 8 collapse during work, the safety of the workers can be ensured. In particular, with pneumatic caissons, the work chamber 4 is high-pressure, so it takes time to enter and exit the work chamber 4 from the outside, which is at normal atmospheric pressure, and once an accident occurs, it is extremely difficult to remove injured people, so improving safety to prevent personal injury accidents is extremely effective in terms of work efficiency.

[0025] Furthermore, the worker can complete the installation of the sander 7 simply by stacking multiple sets of foam resin blocks 8, which simplifies the assembly and disassembly work and allows the work to be completed in a short time.

[0026] The sandle 7 is a polystyrene foam sandle made up of a plurality of polystyrene foam blocks, each of which is made of a rectangular pillar-shaped polystyrene foam. The polystyrene foam blocks are made up of large, hard polystyrene foam blocks.

[0027] 3, a base plate 10 may be provided on the bottom surface 9 of the sandle when the foamed resin block 8 is installed. The base plate 10 is, for example, a plywood board or a board.

[0028] As described above, according to the embodiment of the present invention, since the foam resin blocks 8 constituting the sander 7 are lightweight, the safety of workers can be ensured even if the foam resin blocks 8 collapse during the assembly work. The worker can complete the installation of the sander 7 simply by stacking multiple sets of foam resin blocks 8, which has the effect of simplifying the assembly work. Moreover, since the foam resin blocks 8 are lightweight and inexpensive, the number of work steps can be reduced, and construction costs can also be reduced. [Explanation of symbols]

[0029] 1. Caisson support structure 2 Caisson body 3 Blade mouth part 4. Workroom 5 Ceiling slab 6 Ground 7 Sandor 8 foam resin blocks 9 Bottom of Sandle 10 Bottom plate

Claims

1. In a caisson support structure, a sandle is placed between the ceiling slab of the workroom of the caisson body and the ground below it to prevent the caisson body from tilting or to correct the tilt of the caisson body. The sandle is made up of a plurality of foam resin blocks made of foam resin material stacked up to a height from the ground to the ceiling slab. A caisson support structure characterized by:

2. The sandle is a polystyrene foam sandle made by combining multiple polystyrene foam blocks made of rectangular pillar-shaped polystyrene foam. The support structure for a caisson according to claim 1.

3. A caisson construction method in which a caisson is constructed while being supported by a sandle so that the caisson body does not tilt or so that the tilt of the caisson body is corrected, The support structure of the caisson according to claim 1 or 2 is used. A caisson construction method characterized by the following.

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