JP6253479B2 - Method for constructing concrete structure and formwork used for the method - Google Patents

Description

  The present invention relates to a method for constructing a concrete structure using rolled compacted concrete (hereinafter referred to as RCC concrete).

When building concrete structures such as sabo dams, floor works, revetments, etc. using RCC concrete, the earth and sand formwork is formed by compacting the earth and sand at the construction site of the concrete structure and forming the mold surface as a slope. The concrete structure is constructed by placing RCC concrete inside the earth and sand mold and rolling it.
In this method, the concrete portion placed on the slope of the earth and sand formwork is not regarded as a structure and becomes a useless portion. In addition, the concrete part formed by placing on the slope of the earth and sand formwork will be the edge of a concrete structure with a saw-shaped longitudinal section, and if the edge of this concrete structure is exposed, It is necessary to hang saw-shaped concrete protrusions that are not regarded as bodies and form them into a single plane.
Therefore, a method of constructing a concrete structure in which the mold surface of the earth and sand mold is formed in a vertical plane and the end portion is a vertical plane is known (see Patent Document 1).

JP 2007-231685 A

However, in the method of constructing a concrete structure in which the mold form surface of the earth and sand formwork is formed in a vertical plane and the end part is a vertical surface, in order to maintain the formwork surface of the earth and sand formwork in the vertical plane In addition, it is necessary to add chemicals such as sodium silicate, silica sol, aggregating agent, or a self-supporting material such as cement to increase the viscosity of the earth and sand, which increases costs and labor.
The present invention is a concrete structure constructed by using RCC concrete, and enables a concrete structure having an end portion to be a vertical surface or a surface close to the vertical surface easily and easily.

The method for constructing a concrete structure according to the present invention includes a mold plate that forms a mold surface, a self-supporting support plate attached to the back surface of the mold surface of the mold plate, and a hook portion for moving the mold frame. The mold plate is formed by a rectangular flat plate, the self-supporting support plate is formed by a flat plate, and the plate surface of the flat plate is a pair of opposing side end surfaces of the mold plate and the mold frame. A method for constructing a concrete structure using a formwork provided on one side of a pair of opposing sides of a mold plate, the hook being provided so as to be orthogonal to the back surface of the surface. a mold placed steps formwork surface of the mold is placed the mold so as to rise from the reference position of the concreting target surface on the concreting target surface, installed at the reference position of the concreting target surface Concrete separated by a defined formwork A step of placing concrete on the surface to be cast, and a step of rolling the concrete placed on the surface to be cast after removing the formwork from the surface to be cast. It is possible to easily and easily construct a concrete structure that is constructed using RCC concrete and that has a vertical surface or a surface close to the vertical surface.
Moreover, a concrete structure having a desired height can be easily and easily constructed by repeating a series of operations including the steps.
Further, when placing concrete for one lift on a concrete placement target surface, a concrete structure with higher quality can be constructed by performing concrete placement for one lift in multiple times.
The formwork used in the method for constructing a concrete structure according to the present invention includes a formwork plate forming a formwork surface, a self-supporting support plate attached to the back surface of the formwork surface of the formwork plate, and a formwork. And the mold plate is formed by a rectangular flat plate, the self-supporting support plate is formed by a flat plate, and the plate surfaces of the flat plate are opposed to a pair of mold plates. Since it is provided so as to be orthogonal to the side end face and the back surface of the formwork surface, the hook portion is provided on one side of the pair of opposing sides of the formwork plate. removal results in easier and to make it easy to name the task, so the concrete structure as described above can be constructed simply and easily.

The perspective view which shows a formwork installation state. Process drawing which shows the construction method of a concrete structure. Process drawing which shows the construction method of a concrete structure. The perspective view of a formwork. The perspective view which shows the hook member hooked on the hook part of a formwork. A formwork is shown, (a) is a top view, (b) is a front view, (c) is a side view.

First, a formwork and a formwork collapse prevention member used in the method for constructing a concrete structure according to the embodiment will be described.
As shown in FIGS. 4 and 6, the mold 1 has a configuration including a mold plate 2, a self-supporting support plate 3, and a hook portion 4.
The mold plate 2 is formed of a long flat plate (a rectangular plate that is long in the horizontal direction) having a rectangular plate surface such as a metal such as steel, a synthetic resin, or wood, and one plate surface is a mold frame. It functions as the surface 21. A lower end surface 22 of the mold plate 2 is formed by one long side end surface of the mold plate 2.
The self-supporting support plate 3 is formed of, for example, a metal plate such as steel, a synthetic resin, or a wooden plate, and the back surface 23 of the mold plate 2 formed by the other plate surface of the mold plate 2 and the self-supporting support plate 3. The angle formed by the plate surface 30 is 90 ° (see FIG. 6A), and the angle formed by the same surface as the lower end surface 22 of the mold plate 2 and the plate surface 30 of the self-supporting support plate 3 is 90 °. As shown in FIG. 6B (see FIG. 6B), it is connected to the back surface 23 of the mold plate 2 by connecting means such as welding. That is, the self-supporting support plate 3 is formed of a flat plate, and the plate surface of the flat plate is provided so as to be orthogonal to the pair of long side end surfaces of the mold plate 2 and the back surface 23 of the mold frame surface 21.
The self-supporting support plate 3 includes a center-side self-supporting support plate 3A connected to a back surface 23 on the center side in the longitudinal direction of the mold plate 2 by a connecting means such as welding, and a back surface on the end side in the longitudinal direction of the mold plate 2 23 is provided with an end-side self-supporting support plate 3 </ b> B connected to a connecting means such as welding. The center side self-supporting support plates 3A are provided, for example, on the back surface 23 on the center side in the longitudinal direction of the mold plate 2, and the end side self-supporting support plates 3B are on both end sides of the mold plate 2 in the longitudinal direction. One is provided on the back surface 23 of each.

As shown in FIG. 6 (c), the center-side self-supporting support plate 3A has a height dimension of the connecting end surface 31 connected to the back surface 23 of the mold plate 2 that is the height of the mold plate 2 (short of the rectangular plate). It is formed to have a height dimension substantially the same as the side length dimension).
The end-side self-supporting support plate 3 </ b> B is formed such that the height dimension of the connecting end surface 32 connected to the back surface 23 of the mold plate 2 is approximately half the height of the mold plate 2. .
The center-side self-supporting support plate 3 </ b> A includes a lower end surface 33 extending from the lower end of the connection end surface 31 in a direction orthogonal to the rear surface 23 of the mold frame plate 2 so as to be separated from the mold surface 21, and a mold plate from the upper end of the connection end surface 31. 2 substantially has a trapezoidal shape including an upper end surface 34 extending away from the mold surface 21 in a direction orthogonal to the rear surface 23 of the two, and a rear end surface 35 connecting the rear end of the lower end surface 33 and the rear end of the upper end surface 34. It is formed of a plate.
The end-side self-supporting support plate 3B includes a lower end surface 36 that extends from the lower end of the connection end surface 32 in a direction orthogonal to the rear surface 23 of the mold plate 2 away from the mold surface 21, and an upper end and a lower end surface of the connection end surface 32. 36 is formed by a substantially triangular plate having a rear end surface 37 connecting the rear end of 36.
The lower end surface 22 of the mold plate 2, the lower end surface 33 of the center-side self-supporting support plate 3A, and the lower end surface 36 of the end-side self-supporting support plate 3B are orthogonal to the mold surface 21 and the back surface 23 of the mold plate 2. These lower end surfaces 22; 33; 36 constitute an installation surface in contact with the concrete placement target surface 72.
For example, when the mold plate 2 of the mold 1 is formed of a rectangular plate that is long in the horizontal direction, the long side of the rectangular plate has a length of 6000 mm, the short side has a length of 750 mm, and the center side self-supporting support plate 3A. The length of the lower end surface 33 is 525 mm, the length of the lower end surface 36 of the end-side self-supporting support plate 3B is 325 mm, and the length of the connecting end surface 32 of the end-side self-supporting support plate 3B is 400 mm.

  The hooking portion 4 is connected to the plate surface 30 on the upper end surface 34 side of the center side self-supporting support plate 3A by a connecting means such as welding or bolts and nuts, and is in the direction approaching the back surface 23 of the mold plate 2. A connecting part 41 extending rearward (see FIG. 4; FIG. 6C), which is a direction away from the back surface 23 of the plate 2, and a hook-shaped member extending forward from the rear side of the connecting part 41 and extending forward. A claw portion 42 is provided.

As shown in FIG. 1, the mold collapse prevention member is made of, for example, a weight 5. The weight 5 is configured by filling concrete into a rectangular box made of metal, for example.
The weight 5 includes, for example, a pair of hook portions 50; The hook portion 50 is provided so as to protrude upward from the upper ends of a pair of side surfaces of the rectangular box facing each other (see FIG. 1; FIG. 5), or provided so as to protrude from the upper plate of the rectangular box. It is done.
Similar to the hook portion 4 of the mold 1, the hook portion 50 includes a connecting portion 51 to the rectangular box and a hook-shaped engaging claw portion 52 that extends forward from the rear end side of the connecting portion 51 and then extends forward. (See FIG. 2B).

For example, the mold 1 and the weight 5 are lifted by using a hooking member 6 as shown in FIG. 5 held by an attachment provided at the tip of a backhoe arm (not shown).
The hook member 6 includes a hook plate 61 and a gripped portion 62.
The hook plate 61 is inserted from the opening 43 between the front side of the engaging claw portion 42 of the hook portion 4 and the front side of the connecting portion 41 and is hooked on the engaging claw portion 42, or the engaging claw portion of the hook portion 50. It is inserted from the opening 53 between the front side of 52 and the front side of the connecting portion 51 and is hooked on the engaging claw portion 52.
The gripped portion 62 is, for example, a gripping claw of an attachment (not shown) that is provided at the tip of an arm of a backhoe (not shown) and is rotatable about the central axis of the arm, and is indicated by arrows A and B in FIG. It is a site | part grasped from the front-back direction.
That is, the hook member 6 is held by the attachment at the tip of the backhoe arm by gripping the gripped portion 62 of the hook member 6 with the gripping claws of the attachment provided at the tip of the backhoe arm.

  Then, in a state where the hook member 6 is held by the attachment provided at the tip of the arm of the backhoe, the arm of the backhoe is moved, and the hook plate 61 of the hook member 6 is engaged with the engaging claw portion 42 or the hook portion of the hook portion 4. After engaging the 50 engaging claws 52, the mold 1 and the weight 5 are placed at a desired position by operating the backhoe so that the mold 1 and the weight 5 are lifted and moved to a desired location. Can be made.

Next, the construction method of a concrete structure is demonstrated.
As shown in FIG. 1, the concrete structure is constructed by placing the formwork 1 at the reference position of the concrete placement target surface 72 so as not to fall down, and placing the RCC concrete 71 on the concrete placement target surface 72. After that, the mold 1 was moved upward and removed, and then the RCC concrete 71 placed on the concrete placement target surface 72 was rolled.

  The construction method of the concrete structure is broadly divided into a mold installation step, a concrete placement step of placing RCC concrete 71 on a concrete placement target surface 72 partitioned by the mold 1, a mold removal step, A rolling step for rolling the RCC concrete 71 placed on the concrete placement target surface 72.

In the mold installation step, first, as shown in FIG. 2A, the concrete placement target surface 72 is formed by placing, for example, one lift of RCC concrete 71 on the concrete placement target portion 70 leveled at the site 69. Then, the height (level) of the concrete placement target surface 72 is measured.
The mold 1 is placed on the concrete placement target surface 72 so that the formwork surface 21 of the mold 1 preferably rises vertically from a reference position that is the position of the outer peripheral surface of the concrete structure. It installs on the surface 72 (refer FIG.2 (b)).
In the installation work of the mold 1, the weight 5 is set at a reference position on the concrete placing target surface 72, and then the mold surface 21 is supported by the weight 5 using the weight 5 as a ruler (mark) for the reference position. Thus, the mold 1 may be installed at the reference position on the concrete placing target surface 72, or after the mold 1 is installed at the reference position, the weight 5 is installed so as to support the mold surface 21. May be.
The weight 5 is preferably installed so as to straddle the end of one of the adjacent molds 1 and the end of the other mold 1 that are installed so as to be aligned along the reference position. That is, it is preferable to place the weight 5 at the joint portion 11 between the end of one mold 1 and the end of the other mold 1 (see FIG. 1).
And as shown in FIG.2 (c), the earth and sand 68 is piled up on the back surface 23 side of the formwork board 2 installed in the reference | standard position on the concrete placing object surface 72. FIG. In this case, at least below the self-supporting support plate 3 protruding from the back surface 23 of the mold plate 2 so that the mold surface 21 side of the mold 1 does not fall to the concrete placement target surface 72 side even if the weight 5 is removed later. The earth and sand 68 is piled up so that the side is covered with the earth and sand 68.
Thereafter, the weight 5 is removed from the concrete placing target surface 72.
Thus, the mold 1 is installed so as not to fall on the concrete placing target portion 70.

  In the concrete placement step, RCC concrete 71 is placed for one lift on the concrete placement target surface 72 partitioned by the mold 1. In this case, it is preferable to perform concrete placement for one lift in a plurality of times (see FIG. 3A; FIG. 3B). When the concrete placement for one lift is performed in a plurality of times, each time the RCC concrete 71 is placed, the surface of the RCC concrete 71 is spread with a bulldozer or the like. In this way, if the concrete placement for one lift is performed in a plurality of times, a higher quality concrete structure can be constructed.

In the mold removal step, RCC concrete 71 for one lift is placed and spread, and then a hook plate 61 provided at the tip of the arm of the backhoe is hooked on the engaging claw portion 42 of the mold 1 to form the mold. 1 is lifted upward and removed (see FIG. 3C).
If the concrete placement target surface 72 is a horizontal plane, the mold frame 1 has an installation surface (the lower end surface 22 of the mold plate 2, the lower end surface 33 of the center-side self-supporting support plate 3 </ b> A, the end portion on the horizontal plane. When the lower self-supporting support plate 3B is placed in contact with the lower end surface 36B, the plate surface of the mold plate 2 and the plate surface of the self-supporting support plate 3 are configured to be vertical surfaces. Therefore, when the mold 1 is moved upward and removed, the weight and resistance of the earth and sand 68 accumulated on the back surface 23 side of the mold 1 are less likely to be applied to the mold 1, so that the mold 1 is moved upward. The removal work to be removed can be easily and easily performed.

  In the rolling step, RCC concrete 71 for one lift is placed and spread on the concrete placement target surface 72, and after the formwork 1 is removed, the spread RCC concrete 71 of the RCC concrete 71 is spread. The RCC concrete 71 is rolled and compacted from the surface side with a vibrating roller 67 or the like (see FIG. 3D).

  The installation work and the removal work of the mold 1 and the weight 5 are performed by, for example, operating the backhoe by remote control or by operating the backhoe by a person.

  Then, after the mold surface 21 side of the mold 1 is prevented from falling to the concrete placement target surface 72 side, the weight 5 is removed, and the RCC concrete 71 is placed on the concrete placement target surface 72 partitioned by the mold 1. A concrete structure having a desired height is obtained by sequentially performing a series of operations for a plurality of lifts for the purpose of rolling the RCC concrete 71 after removing the formwork 1 after placing and leveling the lift. Things can be constructed easily and easily.

According to the present invention, the installation work and removal work of the mold 1 can be performed easily and easily. And since the end part of the concrete structure constructed by the method can be formed on a vertical surface or a surface close to the vertical surface, it is possible to eliminate an unnecessary portion that is not regarded as a structure. The amount of RCC concrete consumption can be reduced, and the work of picking up the excess concrete can be eliminated.
That is, according to the present invention, a concrete structure constructed by using RCC concrete, the end portion can be a vertical surface or a surface close to the vertical surface, and unnecessary portions that are not regarded as a structure are eliminated. It is possible to construct a concrete structure that can be used easily and easily.

In addition, without using the heavy stone 5 as a mold collapse prevention member, the end of one mold 1 adjacent to the other and the end of the other mold 1 are connected by a connecting means such as a removable connecting plate. May be.
Further, in the embodiment, the mold plate 2 formed by a flat plate having a long plate surface is exemplified, but the shape of the plate surface of the mold plate is not particularly limited, and for example, by a flat plate having a square plate surface. It may be a formed form plate. When the mold plate is formed by a flat plate having a square plate surface, the plate surface of the self-supporting support plate 3 formed by the flat plate is orthogonal to a pair of opposite side end surfaces of the mold plate and the back surface of the mold frame surface. The hook 4 may be configured to be provided on one side of the pair of opposing sides of the formwork plate.

1 Formwork, 2 Formwork plate, 3 Self-supporting support plate, 4 Hook, 21 Formwork surface,
23 Back side of formwork surface, 71 RCC concrete, 72 Concrete placement target surface.

Claims (4)

A mold plate that forms a mold surface, a self-supporting support plate attached to the back surface of the mold surface of the mold plate, and a hook portion for moving the mold frame, the mold plate having a rectangular shape The self-supporting support plate is formed of a flat plate, and the plate surface of the flat plate is provided so as to be orthogonal to a pair of opposing side end surfaces of the mold plate and the back surface of the mold frame surface, The hook is a method for constructing a concrete structure using a mold provided on one side of a pair of opposing sides of the mold plate,
A mold installation step for installing the mold on the concrete placement target surface so that the mold surface of the mold rises from the reference position of the concrete placement target surface;
Placing concrete on a concrete placement target surface separated by a formwork installed at a reference position of the concrete placement target surface;
After removing the formwork from the concrete placement target surface, rolling the concrete placed on the concrete placement target surface;
A method for constructing a concrete structure characterized by comprising:   2. The method for constructing a concrete structure according to claim 1, wherein a series of operations including the steps is repeated.   The concrete structure according to claim 1 or 2, wherein when placing concrete on the concrete placement target surface for one lift, the concrete placement for one lift is performed in a plurality of times. Construction method. It is a formwork used for the construction method of the concrete structure according to any one of claims 1 to 3,
A mold plate that forms the mold surface, a self-supporting support plate attached to the back surface of the mold surface in the mold plate, and a hook portion for moving the mold frame ,
The mold plate is formed by a rectangular flat plate,
The self-supporting support plate is formed of a flat plate, and the plate surface of the flat plate is provided so as to be orthogonal to a pair of opposing side-side end surfaces of the mold plate and the back surface of the mold frame surface,
The hook is provided on one side of a pair of opposite sides of the mold plate.

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