JPH08199539A - Checkdam precast form and usage thereof - Google Patents

Abstract

PURPOSE: To improve workability, to enhance safety and to prevent the infiltration of external rainwater by saving the waste of the labor and time of removing operation, avoiding the generation of a falling accident and eliminating the combination of a scaffolding for operation and a preventive fence for obviating accidents. CONSTITUTION: Forms 1 are formed in a precast concrete integrally molded form, in which a rectangular panel front plate 2 and a rectangular panel rear plate 3 are displaced in the diagonal direction and the panel rear plate 3 is projected in the lower lateral direction, an engaging projecting strip 4 is formed to an upper section at the upper end of the panel front plate 2, and an engaging recessed groove 5 is formed at the lower end of the panel front plate 2. A plurality of fixing reinforcements are protruded from the rear of the panel rear plate 3, and a plurality of connecting bolts are protruded from the rear of the projecting section of the panel front plate 2. Box battens 6 for inserting a plurality of connecting bolts penetrated from a front to the rear are arranged to the lower protruded section of the panel rear plate 3, anchor bolts for clamping the connecting bolts are mounted on the box battens 6, and a cut-off rubber seal 7 is disposed onto the protruded section front of the panel rear plate 3.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a discard formwork which is stretched on the front surface of a sabo dam for pouring dam concrete.

[0002]

2. Description of the Related Art A formwork is used for placing concrete in a dam body of a conventional sabo dam. In the old days, a wooden formwork was used. It was fixed, most recently metal foam is used, and it is fixed with tightening metal fittings and pipes. But,
Assembling and disassembling these forms takes time and effort, and the frequency of falling accidents that occur during the assembling and disassembling of forms is extremely high. It was necessary to use scaffolding and prevention fences together with the formwork.

[0003]

SUMMARY OF THE INVENTION The problem to be solved by the present invention is to solve the problems of the conventional formwork used for placing concrete in the dam body, and to provide a discard formwork which does not require removal work. By doing so, it is possible to save the labor and time of the dismounting work, to avoid the occurrence of a fall accident during the dismounting work, and to eliminate the combined use of work scaffolding and prevention fences to prevent accidents. By using the assembly method, the workability is improved to ensure safe and quick construction, and concrete can be placed in the dam body without scaffolding, and the retaining wall is eliminated to facilitate compaction after placing concrete. In the case of the RCD method, the bulldozer can be easily moved, concrete can be spliced easily, and since the formwork is a panel, the slope can be set freely and stability is good. And then, to have a resistance to the inner pressure of the dam concrete, it is to provide a further formwork dam concrete 設用 of check dams without entering the external rain water.

[0004]

The means of the present invention for solving the above-mentioned problems is, in the invention of claim 1, a waste form for dam concrete pouring of a sabo dam, in which the form is a rectangular panel. The front panel and the rectangular panel rear panel are diagonally displaced vertically or in a staggered manner to project the panel rear panel downward and laterally, and the panel front panel is relatively extended upward and laterally in the symmetrical direction. It is composed of an integrally molded body of precast concrete that is formed by tightening, the upper part of the panel front plate is formed with an engaging ridge with the rear part protruding upward, and the lower part of the panel front plate is fitted with the rear part of the engaging concave groove upward. A plurality of connecting bolts projecting on the rear surface of the panel front plate extension, and a plurality of connecting bolts penetrating from the front to the rear surface of the panel rear plate downward extension. Anchor for fastening connecting bolts It allowed comprising a plate, in front of the tension out of the panel after the panel is precast formwork check dams, characterized in that arranged the water stopping material in vertical and horizontal cross-shaped.

According to a second aspect of the present invention, a precast of the erosion control dam in the means of the first aspect is characterized in that an upper corner of the panel rear plate on the side overlapping with the panel front plate is cut out to form a panel rear plate cutout portion. It is a formwork.

According to the third aspect of the invention, in the downward extension of the panel rear plate, a bolt for adjusting the slope of the form is provided above the rear side of the panel rear plate and above the connecting bolt insertion box. It is the precast formwork of the sabo dam according to the means of any one of claims 1 and 2.

According to a fourth aspect of the present invention, there is provided a rectangular panel having the same thickness as the panel front plate of the mold and a leg portion extending rearward from the lower end of the panel to form a lower portion having an L-shaped cross section. A mold for a precast formwork of a sabo dam, characterized in that an engaging projection is formed on the upper end of the panel, the rear side of which projects upward, and a plurality of connecting bolts are provided on the rear surface of the rectangular panel. It is a frame basic block.

According to the invention of claim 5, a precast formwork comprising the panel front plate and the panel backplate according to any one of claims 1 to 3 is laid, and concrete is poured into the precast formwork. In the method of forming a sabo dam by using the concrete, the concrete of the sabo dam is characterized by placing concrete up to the height of the upper end of the panel rear plate and leaving the upward protrusion of the panel front plate as a fall prevention wall protruding upward. It is a setting method.

In a sixth aspect of the present invention, a precast formwork comprising the panel front plate and the panel rear plate according to any one of the first to third aspects is laid, and concrete is placed in the precast formwork. In the method of forming a sabo dam, the concrete placing method of the sabo dam is characterized by placing concrete to the height of the lower end of the panel front plate and leaving the panel front plate part as a fall prevention wall protruding upward. Is.

According to the invention of claim 7, in a method for forming concrete in a precast form to form a sabo dam, either the dam front surface side or the dam back surface side is claimed in claim 5 or claim 6. Concrete pouring by any means, and the other remaining on the dam front side or the back side of the dam is concrete pouring by any of the remaining means according to claim 5 or claim 6, It is the setting method.

[0011]

In the discarding form according to the present invention, the panel front plate and the panel rear plate are diagonally displaced vertically or in a staggered manner, the panel front plate is projected upward and laterally, and the panel rear plate is relatively lower. Since it is an integrally molded body of precast concrete that is laid out symmetrically in the horizontal direction, when combining the formwork, not only the front panel and the rear panel of the formwork adjacent to each other in the vertical direction overlap but also the horizontal direction. The panel front plate and the panel rear plate, which are adjacent to each other in the direction, are overlapped with each other, and the whole is engaged with each other to form a large mold. Therefore, water leakage can be completely prevented by arranging a water blocking material such as butyl rubber in a vertical and horizontal cross shape on the front surface of the protruding portion of the panel rear plate.

When pouring concrete into the laid formwork, in the method of pouring concrete to the height position of the upper end of the panel rear plate (referred to as method A), the upper projecting portion of the panel front plate is the upper part. It protrudes and remains, and acts as a fall prevention wall.

Further, in the case of placing concrete in the laid formwork, in the method of placing concrete up to the height position of the lower end of the panel front plate (referred to as method B), the entire front plate portion of the panel is used. The top of the fall-prevention wall can be made high by protruding above and remaining. And in this case, the pressure on the concrete is entirely on the compression side.

Usually, the slope of the front surface and the back surface of the dam are different,
Therefore, if the same form is used for both of them, the vertical height of each piece is different between the front and back of the dam, and the connecting joints in the vertical direction do not come to the same height position on the front and back as shown by reference numerals 34 and 35 in FIG. Therefore, for example, when concrete is placed on the front and back of the dam only by the method A, two types of formwork are required on the front and back, which is inconvenient. However, depending on the difference in the slope between the front and back, the above A and B
By using the above method in combination, it is possible to drive with one type of form, and the panel itself becomes self-supporting regardless of the position of the panel, which is good.

Since the rear side of the panel front plate is formed with an engaging convex strip protruding upward, and the front side of the panel front plate is formed with an engaging concave groove in which the rear side is fitted upward, the lower formwork is formed. When the upper mold is placed on the upper side, these engaging ridges engage with the engaging concave grooves. Further, this engaging portion acts as a fulcrum, and when the formwork is installed so as to be inclined rearward, when the upper formwork is suspended and lowered, the lower end of the panel front plate of the upper formwork is placed on the lower side. When placed on the upper end of the panel front plate of the form, the upper form rotates by its own weight to the rear so that the engaging convex strips and the engaging concave grooves of the upper and lower forms fit and engage with each other.

Since the connecting bolts are fastened to the anchor plates inside the box, the upper, lower, left and right molds after assembly are supported by the upper and lower three points for safety. Further, since the fixing reinforcing bars are projected rearward from the panel rear plate of the form, the form is securely fastened by the cast concrete.

One upper corner of the panel rear plate, which overlaps with the panel front plate, is cut out to form a panel rear plate cutout portion to reduce the weight of the mold and to optimize the rotational moment due to its own weight on the back surface.

Since the formwork has the bolts for adjusting the slope of the formwork, it is possible to adjust the inclination of the formwork inclining to the back side.

Since the formwork basic block having an L-shaped cross section having the leg portion extending from the lower end of the panel to the back side is provided, the leg portion is cast into the foundation concrete of the sabo dam, and the leg portion is located below the base concrete. The angle of the bottom surface can be adjusted with adjustable concrete, and the slope of the panel can be adjusted arbitrarily.

[0020]

An embodiment of the present invention will be described with reference to the drawings.
1 to 14 are views relating to a precast mold of the present invention, and FIGS. 15 to 16 are views relating to a mold base block.

1 to 14, the waste formwork for dam concrete pouring of the sabo dam of the present invention comprises a precast formwork 1 made of an integrally formed body of precast concrete. The precast formwork 1 is a rectangular front panel 2 having a width of 2000 mm and a vertical length of 1000 mm and a thickness of 80 mm, and a rectangular rear panel 3 having a width of 1950 mm and a vertical length of 990 mm and a thickness of 70 mm, and a width of 350 mm in a diagonal direction.
It is staggered by 350 mm vertically, and the rear panel 3 of the panel is extended horizontally downward. Therefore, the front panel 2 and the like have a shape that extends 400 mm horizontally and 360 mm vertically. At the upper end of the panel front plate 2, there is an engaging ridge 4 whose rear side projects upward by 46 mm. At the lower end of the front panel 2 of the panel, there is an engaging groove 5 whose rear side is fitted upward by 46 mm. On the back side of the panel rear plate 3, each row is arranged in two rows in the U-shape in the horizontal direction.
A total of six fixing reinforcing bars 8 are arranged so as to project rearward one by one. On the rear surface of the protruding portion of the panel front plate 2, three connecting bolts 9 are provided so as to project rearward, one at each of the left and right of the upper part and one at the lateral lower part. On the downward extending portion of the panel rear plate 3, there are provided a connecting bolt insertion box punch 6 penetrating from the front surface to the rear surface, one at each of the left and right lower portions and one at the lateral upper portion. As shown in FIG. 11, an anchor plate 19 for fastening a connecting bolt is embedded in the box-out 6 on the front surface 17 side of the panel rear plate. Further, on the front surface 17 of the protruding portion of the panel rear plate 3, a water blocking material 7 made of butyl rubber is arranged in a vertical and horizontal cross shape.

The panel front plate 2 and the panel rear plate 3 on the side overlapping with the panel front plate 2.
An upper corner of the panel is cut out in a width of 1200 mm and a length of 240 mm to form a panel rear plate cutout portion 10.

In the downwardly extending portion of the panel rear plate 3, a gradient adjusting bolt 18 of the form 1 is inserted from a rear surface to a front surface 17 of the panel rear plate 3 at a position above the connecting bolt insertion box opening 6. .

On the other hand, FIGS. 15 and 16 show a formwork basic block 28 which supports the precast formwork 1 at the lowermost stage. Formwork basic block 28 has a width of 2000 m
m, length 700 mm, thickness 80 mm rectangular panel 29,
It is composed of legs 30 extending rearward from the lower end of the rectangular panel 29 and forming a lower portion having an L-shaped cross section. This rectangular panel 29 corresponds to the panel front plate 2 of the precast formwork 1.
Therefore, at the upper end of the rectangular panel 29, the engaging projection 4 is provided with the back side protruding upward.

FIG. 6 is a view showing the assembled state of the precast mold 1 as seen from the back side. As can be seen from this figure, each precast mold 1 is bolted 11 to the precast molds 1 that are adjacent in the left, right, up, and down directions.

A method for placing concrete in a dam body concrete of a sabo dam using the precast mold 1 of the present invention will be described.
First, as shown in FIG. 16, the formwork base block 28 is located at the bottom of the dam construction site, and the adjustment bottom 32 of the leg portion 30 of the formwork base block 28 is adjusted by the adjustment concrete 32 to adjust the inclination gradient of the rectangular panel 29. To the front of the dam. Next, the foundation concrete 33 is cast to form the first stage.

Next, a method of laying the precast formwork 1 and a method of placing dam concrete will be described with reference to FIGS. 7 to 13. As shown in FIG. 7, the hanging metal fitting 12 attached to the hanging wire 13 hung from a crane (not shown) is hooked on the connecting bolt 9 of the panel front plate 2 of the precast mold 1 and pressed by the fixing pin 14 to hold the precast mold 1 Is hung vertically and brought onto the existing lower precast formwork 1. Then, as shown in FIG. 8, the front surface 17 of the panel rear plate 3 of the suspended precast formwork 1 is vertically brought into contact with the back surface of the engaging ridge 4 at the upper end of the panel front plate 2 of the lower precast formwork 1. take down. Next, as shown in FIG. 9, after lowering the precast formwork 1 that has been hung down to the engaging meshing portion formed by the engaging projections 4 and the engaging recess grooves 5 of the upper and lower precast formwork 1, Loosen the hanging wire 13. As shown in FIG. 10, the precast mold 1 in the upper stage in which the hanging wire 13 is loosened rotates by its own weight in the rotation direction 19 with the engaging meshing portion serving as a fulcrum and the upper portion moving backward.
The upper and lower precast forms 1 are engaged. At this time, a rotational force in the direction of the locus 21 as shown in FIG. 11 (a) acts on the upper precast mold 1. Therefore, the connecting bolt 9 protruding from the panel front plate 2 of the lower precast mold 1 is inserted into the anchor plate 19 of the bolt connecting box 6 of the panel rear plate 3 of the upper precast mold 1, and the gradient adjusting bolt is attached. The gradient of the upper precast mold 1 is adjusted with 18 and fixed with a fixing nut 20.

At this time, the water blocking material 7 made of butyl rubber disposed on the front surface 17 of the panel rear plate 3 of the upper precast mold 1 is pressed against the panel plates of the upper, lower, left, and right precast molds 1 to form the mutual panels. The space is made watertight, and the internal pressure of the pouring dam concrete is used for crimping to prevent rainwater from entering from the outside.

Explaining concrete pouring,
As shown in FIG. 12, concrete has already been poured up to the upper end of the panel rear plate 3 of the lower precast mold 1 in the method A of the present invention, and the cast concrete 15 has been cast into the joint surface 23. When the upper precast mold 1 is arranged and fixed by the connecting bolts 9 as described above, concrete is poured up to the upper end of the panel rear plate 3 of the upper precast mold 1 to form the new concrete 24. Therefore, concrete is not placed in the upper protruding portion of the panel front plate 2 of the upper precast formwork 1 and the upper protruding portion of the panel front plate 2 extends upwards as a wall, so that it does not fall down. It acts as a prevention wall 27.

In the method A, the resistance of the internal pressure applied from the dam concrete to the precast mold 1 is determined by the fulcrum 22 near the center of the precast mold 1 as shown in FIG.
Are divided into upper and lower parts, and resistance is achieved by the balance between the upper falling side concrete pressure 26 and the lower large resistance side concrete pressure 27.

On the other hand, as shown in FIG. 13, concrete has already been poured up to the lower end of the panel front plate 2 of the lower precast formwork 1 in the method B of the present invention to form the joining surface 23 and the already-cast concrete. There is 15. When the upper precast formwork 1B is arranged and fixed with the connecting bolts 9 as described above, concrete is poured up to the lower end of the panel front plate 2 of the upper stage precast formwork 1B, and the new concrete 2
Set to 4. Therefore, not all the partial concrete of the panel front plate 2 of the upper stage precast form 1B is placed, and the panel front plate 2 part extends upward as a wall. In this case, the method A is used. Larger fall prevention wall 2
Acts 7.

In this case, all the pressure applied from the precast formwork 1 to the dam concrete is on the compression side.

[0033]

As described above, the precast formwork of the present invention is a waste formwork, does not require scaffolding during construction, does not need to be removed after concrete placement, and utilizes its own weight and interlocking to make anchors. The engagement ensures reliable engagement, the anchor does not rust with alkali and can be used for a long time, the construction method is not complicated, it can be assembled safely and in a short time, and the splicing of concrete can be done easily. Is. Also, by combining two types of concrete pouring methods, even on the front and back surfaces of a dam with different slopes, it is economical to place concrete with the same formwork, which is extremely economical compared to conventional dam concrete pouring. It has an excellent effect.

[Brief description of drawings]

FIG. 1 is a perspective view of a sabo dam precast formwork of the present invention.

FIG. 2 is a plan view of a sabo dam precast formwork of the present invention.

FIG. 3 is a front view of a sabo dam precast formwork of the present invention.

FIG. 4 is a side view of the sabo dam precast formwork of the present invention.

FIG. 5 is a rear view of the sabo dam precast formwork of the present invention.

FIG. 6 is a rear view assembly view of the sabo dam precast formwork of the present invention.

FIG. 7 is an assembly procedure diagram showing a lifting state of the sabo dam precast formwork of the present invention by means of a dedicated hanging metal fitting.

FIG. 8 is an assembly procedure diagram showing a vertically suspended state of the sabo dam precast formwork of the present invention using a dedicated suspension fitting.

FIG. 9 is an assembly procedure diagram showing a vertically suspended engagement state in the meshing portion of the sand dam dam precast formwork of the present invention.

FIG. 10 is an assembly procedure diagram showing the engagement rotation state in the meshing portion of the sand erosion dam precast formwork of the present invention.

FIG. 11 is an assembly procedure diagram showing a slope adjustment and a fixing state in the meshing portion of the sabo dam precast formwork of the present invention.

FIG. 12 is a diagram illustrating a method A of concrete pouring for explaining the resistance of the dam body concrete to internal pressure.

FIG. 13 is a diagram related to a B method of concrete pouring, illustrating the resistance of the dam body concrete to internal pressure.

FIG. 14 is a diagram showing a difference in joint height position between front and back of a dam using the same mold.

15A and 15B are views for explaining a formwork basic block, FIG. 15A is a view seen from an upper end of a standing panel, FIG. 15B is a front view of the formwork basic block, and FIG. It is a side view of a block.

FIG. 16 is a view for explaining the laying condition of the formwork basic block.

[Explanation of symbols]

 1 Precast Formwork 2 Panel Front Plate 3 Panel Rear Plate 4 Engagement Convex Line 5 Engagement Groove 6 Bolt Connecting Box Removal 7 Water Stopper 8 Fixing Reinforcing Bar 9 Connecting Bolt 10 Panel Rear Plate Notch 11 Bolt Connecting 12 Hanging Metal Fittings 13 Hanging wire 14 Fixing pin 15 Precast concrete 16 Rear surface 17 Front surface 18 Gradient adjusting bolt 19 Anchor plate 20 Fixing nut 21 Locus 22 Support point 23 Connecting surface 24 New concrete 25 Resistance side concrete pressure 26 Falling side concrete pressure 27 Fall prevention wall 28 Formwork Basic Block 29 Rectangular Panel 30 Leg 31 Adjusting Bottom 32 Adjusting Concrete 33 Basic Concrete 34 Front Side Joint 35 Backside Joint 1A Existing Form 1B New Form

 ─────────────────────────────────────────────────── ─── Continuation of front page (72) Inventor Keihei Aoki 1-7-1, Kyobashi, Chuo-ku, Tokyo Toda Construction Co., Ltd. Incorporated (72) Inventor Yukio Tanada 225 Yodohoncho, Fushimi-ku, Kyoto City Keihan Concrete Industry Co., Ltd.

Claims (7)

[Claims] 1. In a discard formwork for dam concrete pouring of a sabo dam, the formwork is a rectangular panel front plate and a rectangular panel rear plate which are diagonally displaced vertically or in a staggered manner to lower the panel rear plate. It is composed of an integral molded body of precast concrete that is stretched in the lateral direction and the front panel of the panel is relatively stretched in the upper and horizontal directions of the symmetrical direction. An engaging ridge is formed, an engaging groove is formed at the lower end of the panel front plate, the rear side of which is fitted upward, and a plurality of connecting bolts are provided on the rear surface of the protruding portion of the panel front plate. A plurality of connecting bolt insertion box punches that penetrate from the front surface to the rear surface are provided in the downward extension of the panel rear plate, and an anchor plate for fastening the connecting bolts is provided in the box punch, and the panel rear plate tension is set. Water-blocking materials are arranged in a cross shape on the front of the dashi section. A precast formwork for a sabo dam that is characterized by being installed. 2. The precast formwork for a sabo dam according to claim 1, wherein one upper corner of the panel rear plate on the side overlapping with the panel front plate is notched to form a panel rear plate notch. 3. In the lower protruding portion of the panel rear plate,
The erosion control dam according to claim 1 or 2, wherein a bolt for adjusting the slope of the form is inserted from the rear side to the front side of the panel rear plate at a position above the box where the connecting bolt is inserted. Precast formwork. 4. A rectangular panel having the same thickness as that of the front panel of the formwork, and a leg portion extending rearward from the lower end of the panel to form a lower portion having an L-shaped cross section. A formwork basic block for a precast formwork of a sabo dam, characterized in that a rear side of the rectangular panel is formed with engaging ridges, and a plurality of connecting bolts are provided on the back surface of the rectangular panel. 5. A sabo dam is formed by laying a precast formwork comprising a panel front plate and a panel backplate according to any one of claims 1 to 3 and placing concrete in the precast formwork. The concrete pouring method for a sabo dam, characterized in that concrete is poured up to the height of the upper end of the panel rear plate, and the upward projecting portion of the panel front plate is left as a fall prevention wall projecting upward. 6. A sabo dam is formed by laying a precast formwork comprising a panel front plate and a panel backplate according to any one of claims 1 to 3 and placing concrete in the precast formwork. The concrete pouring method for a sabo dam, characterized in that concrete is poured to the height of the lower end of the panel front plate, and the panel front plate is left as a fall prevention wall protruding upward. 7. A method for placing concrete in a precast mold to form a sabo dam, wherein either one of the dam front surface side and the dam back surface side is formed by the method according to claim 5 or 6. A concrete pouring method for a sabo dam, characterized in that concrete pouring is carried out by the remaining method of any one of claims 5 and 6 remaining on the dam front side or the dam back side.