JP4170955B2 - Construction method of concrete structure using residual formwork and soil concrete - Google Patents

Description

  In the present invention, when a concrete structure such as a retaining wall, a sabo dam, a water storage dam, etc. is constructed, a residual formwork is used to construct a strong concrete reinforcing wall corresponding to the outer wall portion. The present invention relates to a remaining formwork to be constructed using soil concrete and a method for constructing a concrete structure using soil concrete.

  Conventionally, when concrete structures such as retaining walls, sabo dams and water storage dams are constructed, soil concrete in which cement is added to raw soil generated from the site is used. As a method of constructing the concrete structure using this soil concrete, first, the concrete front reinforcing wall and the back reinforcing wall corresponding to the outer wall portion of the concrete structure are opposed to each other, This is a method in which soil concrete is placed between the two reinforcing walls and pressed and solidified.

  As a method for this, Japanese Patent Publication No. 56-11812 discloses that a large number of legged blocks, each having two legs protruding from a rectangular base, are staggered and the legs of the upper and lower legged blocks are mutually connected. The front wall and the rear wall are formed by stacking so as to be superposed on each other, and between the front wall and the rear wall, a large number of intermediate vertical walls are formed by joining a number of stacked cylindrical blocks with concrete. On the other hand, a method has been proposed in which the remaining space between the front wall and the rear wall is filled with a filler made of poor blended concrete or chestnut.

In JP-A-8-177035, when forming the sleeve portion of the sabo dam with a predetermined height and length, the sleeve portion should be formed at the portion where the sleeve portion is to be formed and located on both sides in the width direction of the sleeve portion. Blocks are arranged along the longitudinal direction to form block rows facing each other, then the generated soil generated by the sabo dam construction is thrown between the block rows, and a generated soil layer with a substantially flat top surface is formed between the block rows Then, the fluid with good fluidity is poured onto the upper surface, the concrete is impregnated into the generated soil layer to form a deposited layer, and thereafter this is repeated to form the sleeve portion. Thus, a method has been proposed in which a solid and stable sleeve portion is formed by a sedimentary layer and a block row using generated soil generated by sabo dam construction.
Japanese Examined Patent Publication No. 56-11812 JP-A-8-177035

  However, in the conventional construction method of soil structure using soil concrete, when constructing both the above-mentioned reinforcement walls, the formwork used is made of wood, metal, etc., so the formwork framed after construction is removed. There is a problem that the work is troublesome and time consuming, and waste materials are produced and the environment is bad.

  Moreover, since concrete structures, such as a dam, are narrowing upwards, they are constructed in a state where both reinforcing walls having a constant thickness corresponding to the outer wall part are also inclined upward. In this state, the inner wall surfaces of the two reinforcing walls are inclined inward, and after the soil concrete is placed between the two reinforcing walls, the soil concrete is compacted with a roller compactor or a vibration pressing machine. When compressing the soil concrete near both reinforcing walls, the reinforcing wall inclined inward gets in the way, and the roller compactor and the vibration pressing machine cannot move to the base of both reinforcing walls. There was a problem that soil concrete could not be compacted.

  Furthermore, in Japanese Examined Patent Publication No. 56-11812, since the block is used to construct the front wall and the rear wall, the shape of the block is complicated and the manufacturing cost increases, and the weight of the block itself is large, and it is carried into the construction site. The cost increases, and a large crane is required to stack them, and it takes a lot of labor to lift and stack the blocks one by one with a crane, and the heavy work at high places is dangerous. In addition, the construction of the front and rear walls by stacking the blocks is weaker than the integrated one where the front and rear walls are constructed by placing ready-mixed concrete, In particular, in the structure of a sabo dam where the interior is weak, such as filling the filler between the front wall and the rear wall, the strength of the front wall and the rear wall is required to be extremely high due to severe impact of sediment and rock from the upstream, etc. The use of the block has a problem in strength. Furthermore, in the block, there are places where stacking cannot be performed depending on the shape of the structure, and there is a problem that it takes time and effort.

  JP-A-8-177035 discloses a method for forming a sleeve part which is a part of a sabo dam. In the formation of the sleeve part, blocks are arranged to form a block row opposite to each other and generated between them. Since it was a method of throwing in soil, it had the same problems as the above-mentioned Japanese Patent Publication No. 56-11812.

  The purpose of the present invention was made in order to solve such conventional problems, and when constructing a concrete structure using soil concrete, the construction of the concrete reinforcing walls corresponding to both the outer wall portions, The remaining formwork can be used to improve workability and to construct concrete structures without generating waste materials, and to ensure that the pressed concrete in the vicinity of the reinforcing wall can be compacted, and both reinforcing walls are integrated. An object of the present invention is to provide a method for constructing a concrete structure using a residual formwork and soil concrete which can be formed into an arbitrary shape and are strong.

When constructing a concrete structure using soil concrete (A), after constructing the front reinforcing wall (2) and the back reinforcing wall (3) made of concrete corresponding to both outer walls, the both reinforcing walls (2) In the construction method in which the soil concrete (A) is placed and pressed into the interior between (2) and (3), the construction of the front reinforcing wall (2) and the back reinforcing wall (3) is a residual type. The frame (4) is used to form a frame with a certain height so that the inner wall surface angle (θ) of both the reinforcing walls (2) and (3) can be formed at a right angle or an obtuse angle, and then green concrete is placed in the frame. When the soil concrete (A) is placed between the reinforcing walls (2) and (3) where the remaining formwork (4) is fixed to the surface, and then placed , Drive lower than the upper ends of both reinforcing walls (2) and (3) and push it When the next self-reinforcing walls (2) and (3) are stacked on the two reinforcing walls (2) and (3), the respective reinforcing walls (2) and (3) are moved up and down. After that, in accordance with the shape of the concrete structure, the frame of the remaining mold (4) and the casting of the ready-mixed concrete and the casting and pressing of the soil concrete (A) are sequentially performed. It is characterized by carrying out to a predetermined height while repeating.

  It is preferable to form a frame by using the remaining formwork (4) having a makeup on the front side of the front reinforcing wall (2).

Each time the soil concrete (A) is placed, the reinforcing concrete (B) having a predetermined thickness is placed on the top of the soil concrete (A) from the upper ends of the two reinforcing walls (2) and (3). It is preferable to place the upper surface of (B) low.

  The soil concrete (A) of the present invention refers to one formed by kneading earth and sand, admixture, cement and the like generated on site. In addition, depending on the case, a material obtained by further adding a small amount of water to the above-mentioned material may be used.

  The ready-mixed concrete of the present invention is a general ready-mixed concrete formed by kneading cement, sand, stone, admixture, water, etc. and not solidified. Therefore, unlike soil concrete (A), since there is no earth and sand generated in the field, the concrete is strong in strength. In addition, the front reinforcing wall (2) and the back reinforcing wall (3) of the present invention are made by placing ready-mixed concrete and solidifying it.

  The remaining formwork (4) of the present invention is a formwork that has been pre-fabricated into a precast concrete panel at the factory, and is framed as a formwork. After the cast concrete has solidified, it remains on the surface of the cast concrete. This refers to a residual formwork made of concrete or metal. And as this residual formwork (4), there are a front residual formwork with various makeup on the surface and a back residual formwork without makeup. The front residual formwork is generally made of a concrete structure. On the front side that is visible to the human eye and on the back side that is not visible to the human eye, the remaining mold for back side is used.

  In the present invention, the front reinforcing wall (2) and the back reinforcing wall (3) can be constructed by using the remaining mold (4). The construction of (2) and (3) is completed and the removal of the formwork is not required. Therefore, there is no need for labor, and no waste material is produced. The wall surface angle (θ) is secured at a right angle or an obtuse angle with respect to the shape.

  In the present invention, the inner wall surface angle (θ) of both the reinforcing walls (2) and (3) is formed to be a right angle or an obtuse angle, so that the two reinforcing walls (2) and (3) are struck. When pressing down the soil concrete (A), the inner walls of both reinforcing walls (2) and (3) are not obstructed even if a roller compactor or a vibration pressing machine is used for pressing. The placed concrete concrete (A) in the vicinity of the walls (2) and (3) can also be compacted, and the entire placed concrete (A) can be compacted. Therefore, the problem that the pressing machine cannot enter near the inside of the two reinforcing walls (2) and (3) as in the prior art and the pressing cannot be performed can be solved.

  Furthermore, in the present invention, since the upper and lower layers of the two reinforcing walls (2) and (3) are integrally joined by placing the ready-mixed concrete, the two reinforcing walls (2) , (3) are stacked in layers, so that the two reinforcing walls (2), (3) are stacked more firmly without being displaced by the internal pressure of the soil concrete (A). it can.

  Further, in the present invention, the surface of the front reinforcing wall (2) is decorated with makeup and the remaining formwork (4) is used, so that the concrete structure on the side of the human eye has an aesthetics such as natural stone or wood grain. be able to.

  Further, in the present invention, every time the concrete concrete (A) is placed, the concrete concrete is made to be inside the concrete structure by placing the reinforcing concrete (B) having a predetermined thickness on the top of the soil concrete (A). Compared with (A) alone, the strength is increased, and in particular, the compressive strength between the two reinforcing walls (2) and (3) is increased, so that the side pressure applied to the concrete structure is sufficiently durable.

  Hereinafter, the embodiment of the present invention will be described in detail with reference to the drawings. FIG. 1 shows an embodiment of the present invention, and is an explanatory view of a method for constructing a sabo dam. The construction method of the present invention will be described with reference to FIG. 1. First, in order to construct the concrete front reinforcing wall (2) and the back reinforcing wall (3) corresponding to the outside of the concrete structure, both the reinforcing walls are used in advance. The foundation concrete (1) is constructed at the construction position of (2) and (3), and the remaining formwork (4) is used on each foundation concrete (1), downstream (left side of the figure). The front reinforcing wall (2) and the upstream (right side in the figure) back reinforcing wall (3) are framed.

  In this framework, the outer remaining formwork (4a) and the inner remaining formwork (4b) are separated from each other by a predetermined distance, and the outer remaining formwork (4a) is inclined according to the inclination of the structure. The frame (4b) is framed so that the inner wall surface angle (θ) of both reinforcing walls (2) and (3) is a right angle or an obtuse angle, and FIG. 1 shows a frame framed at a right angle. And, as the outer remaining formwork (4a) for the front reinforcing wall (2), it is preferable to use the remaining formwork for the front face with makeup on the surface. Since there is no sticking, the remaining residual formwork without makeup, including all remaining formwork (4) for the back reinforcing wall (3), is used. In the case where the outer side of the back reinforcing wall (3) is conspicuous, the outer remaining formwork (4a) may be used as a front remaining formwork with makeup.

  The remaining formwork (4) is generally in the form of a concrete panel, and is precast concrete manufactured in advance in a factory. For example, a material having a thickness of 30 to 40 mm, a width of 900 to 1200 mm, and a height of about 600 mm is used, but is not limited to this dimension. The remaining formwork (4) is stacked on the foundation concrete (1) and is connected and fixed to each other with a connecting metal fitting. Further, as the remaining formwork (4) used in the present invention, as an example, Japanese Patent Application No. 10-204900 is used as the front formwork proposed by the present inventor and Japanese Patent Application No. 10-306461 is used as the remaining formwork for the back. However, the present invention is not limited to this example. (5) is an anchor rebar that protrudes and is fixed to the foundation concrete (1) within the framework, and (6) is a support rebar that supports the spacing of the remaining formwork (4).

  After the frame for the lowermost reinforcing walls (2) and (3) is completed in this way, when the ready-mixed concrete is placed and solidified in the frame, the remaining formwork (4) is directly placed. It adheres to the surface of the concrete and adheres and remains as a part of both reinforcing walls (2) and (3). Therefore, if the remaining formwork (4) is used to form the frame, it will be time-consuming to remove the formwork because the construction of both reinforcing walls (2) and (3) is completed by placing ready-mixed concrete. In addition, workability is extremely good and there is no waste material.

  After the cast concrete is solidified and the construction of the lowest reinforcement walls (2) and (3) is completed, the soil concrete (A) is placed inside the reinforcement walls (2) and (3). Then, the soil concrete (A) is pressed and solidified from above with a roller compactor, a vibration press or the like. At this time, since the wall surface angle (θ) on the inner side of both reinforcing walls (2) and (3) is a right angle or an obtuse angle, a compacting machine is used to compact the placed concrete (A). However, the inner sides of both the reinforcing walls (2) and (3) do not get in the way, and the soil concrete (A) in the vicinity of both the reinforcing walls (2) and (3) is also firmly pressed.

FIG. 2 shows the best embodiment of claim 1 of the present invention. In this FIG. 2, when the soil concrete (A) is placed, it is placed lower than the upper ends of both reinforcing walls (2) and (3). Then, when stacking the next self-reinforcing walls (2), (3) on both the reinforcing walls (2), (3), the inner residual formwork (4b) is placed on the top of the soil concrete (A). After installation, the outer remaining formwork (4a) is stacked on the lower remaining formwork (4a) that has already been installed. Next, the ready-mixed concrete is placed in this framework and solidified to complete the construction of the second reinforcing walls (2) and (3). In this state, the respective upper and lower reinforcing walls (2) and (3) are stacked in layers. Thereafter, the construction of the reinforcing walls (2) and (3) and the placement of the soil concrete (A) are repeated until the desired height is achieved. These upper and lower reinforcing walls (2) and (3) are stacked in layers and stacked, so that the reinforcing walls (2) and (2) in the stacked state against the internal pressure of the cast concrete (A) are stacked. The strength of (3) is increased and it is safe to stack high.

3 and 4 show an embodiment of claim 2 of the present invention. FIG. 3 shows a reinforced concrete (B) having a predetermined thickness placed on top of the soil concrete (A). Fig. 4 shows reinforced concrete (B) placed on top of soil concrete (A), but the upper surface of reinforced concrete (B) is placed lower than the upper ends of both reinforcing walls (2) and (3). As described above, this is because the upper and lower surfaces of the two reinforcing walls (2) and (3) are complicatedly constructed. This reinforced concrete (B) is a general concrete kneaded with cement, gravel, stone, admixture, water, etc., and it is preferable to insert a reinforcing material such as a reinforcing bar in the concrete.

  INDUSTRIAL APPLICABILITY The present invention can be used when constructing concrete structures such as sabo dams, retaining walls, and water storage dams using soil concrete during civil engineering work.

It is explanatory drawing of the construction method which shows embodiment of this invention. It is explanatory drawing which shows other embodiment of this invention. It is explanatory drawing which shows the construction method which provided the reinforced concrete of this invention. It is explanatory drawing which shows the other construction method which provided the reinforced concrete of this invention.

Explanation of symbols

A Soil concrete B Reinforced concrete 2 Front reinforcing wall 3 Back reinforcing wall 4 Remaining formwork θ Wall angle

Claims (2)

When constructing a concrete structure using soil concrete (A), after constructing the front reinforcing wall (2) and the back reinforcing wall (3) made of concrete corresponding to both outer walls, the both reinforcing walls (2) In the construction method in which the soil concrete (A) is placed and pressed into the interior between (2) and (3), the construction of the front reinforcing wall (2) and the back reinforcing wall (3) is a residual type. The frame (4) is used to form a frame with a certain height so that the inner wall surface angle (θ) of both the reinforcing walls (2) and (3) can be formed at a right angle or an obtuse angle. When the soil concrete (A) is placed between the reinforcing walls (2) and (3) where the remaining formwork (4) is fixed to the surface, and then placed , Drive lower than the upper ends of both reinforcing walls (2) and (3) and push it When the next self-reinforcing walls (2) and (3) are stacked on the two reinforcing walls (2) and (3), the respective reinforcing walls (2) and (3) are moved up and down. After that, in accordance with the shape of the concrete structure, the frame of the remaining mold (4) and the casting of the ready-mixed concrete and the casting and pressing of the soil concrete (A) are sequentially performed. A method for constructing a concrete structure using a residual formwork and soil concrete, which is repeated to a predetermined height. Each time the soil concrete (A) is placed, the reinforcing concrete (B) having a predetermined thickness is placed on the top of the soil concrete (A) from the upper ends of the two reinforcing walls (2) and (3). The method for constructing a concrete structure using the residual formwork and soil concrete according to claim 1, wherein the upper surface of (B) is placed low .