JP2993859B2 - Sabo dam precast formwork and its use - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a dumping formwork which is stretched on the front side for placing concrete in a sabo dam.

[0002]

2. Description of the Related Art A formwork is used for placing concrete on a dam body of a conventional sabo dam. In the past, a wooden formwork was used mainly for vertical and horizontal fluttering materials. It has been fixed, and most of the time, metal foam has been used recently, and it is fixed with fasteners and pipes. But,
These forms take time and effort to assemble and remove, and the frequency of falling accidents during assembling and removing the forms is extremely high. Scaffolds and fences had to be used together with the formwork.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to solve the problems of the conventional formwork used for placing concrete in the dam body, and to provide a disposable formwork that does not require removal work. By doing so, the labor and time of the removal work are wasted, the fall accident during the removal work is avoided, and the use of work scaffolds and fences to prevent accidents is eliminated. The method of assembling improves the workability and allows for safe and fast construction, and allows the concrete to be poured into the dam body without scaffolding. In the case of the RCD method, the bulldozer can be easily moved, the concrete can be joined easily, and the slope can be set freely because the formwork is a panel. 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]

According to a first aspect of the present invention, there is provided a dumping form for dam concrete placement of a sabo dam, wherein the form is a rectangular panel. The front panel and the rectangular panel rear panel are shifted diagonally up and down or in a zigzag pattern, and the panel rear panel is extended in the lower horizontal direction. It is composed of an integrally molded precast concrete body, and has an engaging ridge on the upper end of the panel front plate with a rear portion projecting upward at the upper end, and an engagement groove with a rear portion fitted upward on the lower end of the panel front plate. A plurality of connecting bolts are projected from the back of the overhang of the front panel of the panel, and a plurality of connecting bolts are inserted through the bottom overhang of the rear of the panel from the front to the back. And an anchor for 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, the upper part of the panel rear plate on the side overlapping with the panel front plate is cut out to form a notch in the panel rear plate. It is a formwork.

According to the third aspect of the present invention, a bolt for adjusting the inclination of the formwork is inserted from the back to the front of the panel rear plate at a position above the box where the connecting bolt is inserted in the lower overhang portion of the panel rear plate. A precast mold for a sabo dam according to any one of claims 1 and 2, wherein:

According to a fourth aspect of the present invention, a rectangular panel having the same thickness as the panel front plate 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 are provided. 2. The means according to claim 1, wherein an engaging ridge is formed on the upper end of the panel, the rear side of which protrudes upward, and a plurality of connecting bolts are protrudingly provided on the back of the rectangular panel.
This is a formwork foundation block for precast formwork of sabo dams.

According to a fifth aspect of the present invention, a precast form 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 poured into the precast form. A method of forming a sabo dam by placing concrete up to the height of the upper end of the rear panel of the panel, and leaving an overhanging portion of the front panel as a fall prevention wall projecting upward. It is a casting method.

According to a sixth aspect of the present invention, a precast form 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 poured into the precast form. A method for forming a sabo dam, comprising: placing concrete to the height of the lower end of the panel front plate, leaving the panel front plate portion as a fall prevention wall projecting upward. It is.

According to a seventh aspect of the present invention, in the method for forming a sabo dam by placing concrete in a precast formwork, one of the dam front side and the dam back side is defined by the fifth or sixth aspect. 7. A concrete damping method for a sabo dam, characterized in that concrete is cast by any means, and the remaining one on the dam front side or the dam rear side is cast by the remaining means according to any one of claims 5 and 6. It is a setting method.

[0011]

According to the discarding formwork of the present invention, the front panel of the panel and the rear panel of the panel are displaced up and down or in a staggered diagonal direction, the front panel of the panel protrudes upward and laterally, and the rear panel of the panel relatively lowers. Since it is a symmetrically stretched precast concrete molded body in the horizontal direction, when the formwork is combined, not only the front panel and the rear panel of the vertically adjacent formwork overlap but also the horizontal The panel front plate and the panel rear plate of the formwork adjacent to each other in the direction also overlap, and the whole form is engaged with each other to form a large formwork. Therefore, water leakage can be completely prevented by arranging a waterproof material such as butyl rubber in a vertical and horizontal cross shape in front of the overhanging portion of the panel rear plate.

[0012] When concrete is poured into the laid formwork, in the method of placing concrete to the height of the upper end of the rear panel (referred to as the method A), the upper projecting portion of the front panel is an upper part. And acts as a fall prevention wall.

Furthermore, when concrete is poured into the laid formwork, in the method of placing concrete to the height of the lower end of the panel front plate (referred to as the method B), all portions of the panel front plate are formed. It remains protruding upward, and the height of the fall prevention wall can be increased. And in this case, the pressure on the concrete is all on the compression side.

[0014] Usually, the slope of the front and back of the dam is different,
Therefore, when the same formwork is used for both, the vertical height of each sheet differs between the front and back of the dam, and the vertical joints 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, if concrete is installed 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 between the front and back slopes, the above A and B
By using the above method in combination, it is possible to drive with one type of formwork, and the panel itself becomes independent at any position of the driving height of the panel, which is good.

The upper end of the panel front plate is formed with an engagement ridge projecting upward on the rear side, and the lower end of the panel front plate is formed with an engagement concave groove with the rear side fitted upward. When the upper formwork is placed on top, these engagement ridges engage with the engagement grooves. Furthermore, this engaging portion acts as a fulcrum, and when the formwork is installed inclined backward, 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 formwork, the upper formwork rotates upward by its own weight to the back, and the engaging ridges and engaging grooves of the upper and lower formwork fit and engage.

The assembled upper, lower, left and right forms are secured at the upper and lower three points because the connecting bolts are fastened to the anchor plate inside the box, so that they are safe. Furthermore, since the fixing reinforcing bar projects rearward from the panel rear plate of the formwork, the formwork is securely fastened by the cast concrete.

One upper corner of the rear panel on the side overlapping with the front panel is cut out to form a notch in the rear panel, so that the form is reduced in weight and the rotational moment due to its own weight on the back is optimized.

Since the mold has bolts for adjusting the slope of the mold, it is possible to adjust the inclination of the mold to incline to the rear side.

Since a form base block having an L-shaped cross section having legs extending from the lower end of the panel to the rear side is provided, the legs are cast into the foundation concrete of the sabo dam, and the legs are provided at the lower portion thereof. The angle of the bottom can be adjusted with the adjustment 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.
FIGS. 1 to 14 are diagrams related to the precast formwork of the present invention, and FIGS. 15 to 16 are diagrams related to the formwork base block.

In FIGS. 1 to 14, the sacrificial formwork for placing dam concrete of the sabo dam of the present invention comprises a precast formwork 1 formed of an integrally molded precast concrete body. The precast formwork 1 has 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 panel rear panel 3 having a width of 1950 mm and a vertical length of 990 mm and a thickness of 70 mm and having a width of 350 mm diagonally.
The panel rear plate 3 is shifted in a zigzag shape by 350 mm in length, and has a shape in which the rear panel 3 is extended in the lower horizontal direction. Therefore, the panel front other 2 has a shape of 400 mm wide and 360 mm long extending upward and downward. The upper end of the panel front plate 2 has an engaging ridge 4 whose rear side protrudes upward by 46 mm. The lower end of the panel front plate 2 has an engagement groove 5 whose rear side is fitted upward by 46 mm. On the back of the panel rear panel 3, each row is divided into two rows,
A total of six fixing rebars 8 are provided projecting rearward. On the back of the overhang of the panel front plate 2, a total of three connecting bolts 9 are projected rearward, one on each side of the upper part and one on the lateral lower part. At the lower overhang portion of the panel rear plate 3, there are provided a total of three connecting bolt insertion boxes 6 which penetrate from the front surface to the rear surface, one each at the left and right at the bottom and one at the horizontal upper portion. As shown in FIG. 11, the box blanks 6 are provided with embedded anchor plates 19 for fastening connection bolts on the front side 17 of the rear panel panel. Further, a waterproof material 7 made of butyl rubber is disposed on the front surface 17 of the overhanging portion of the panel rear plate 3 in a vertical and horizontal cross shape.

Panel rear plate 3 on the side overlapping panel front plate 2
The upper corner is cut out at a width of 1200 mm and a height of 240 mm to form a notch 10 at the rear of the panel.

In the lower overhang portion of the panel rear plate 3, a slope adjusting bolt 18 of the formwork 1 is inserted from the rear surface to the front surface 17 of the panel rear plate 3 at a position above the connecting bolt insertion box blank 6. .

On the other hand, FIGS. 15 and 16 show a formwork base block 28 for supporting the precast formwork 1 at the lowest stage. The formwork foundation block 28 is 2000m wide.
m, a rectangular panel 29 with a length of 700 mm and a thickness of 80 mm,
It comprises legs 30 extending rearward from the lower end of the rectangular panel 29 and forming a lower part having an L-shaped cross section. This rectangular panel 29 corresponds to the panel front plate 2 of the precast mold 1.
Therefore, at the upper end of the rectangular panel 29, the engaging ridge 4 is provided so that the rear side protrudes upward.

FIG. 6 is a view of the assembled state of the precast mold 1 as viewed from the rear side. As can be seen from this figure, each precast form 1 is bolted 11 to adjacent precast forms 1 in the left, right, up and down directions.

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

Next, the method of laying the precast formwork 1 and placing the dam concrete will be described with reference to FIGS. As shown in FIG. 7, a hanging metal fitting 12 attached to a 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 is held down by a fixing pin 14. Is vertically suspended and brought on the existing lower precast formwork 1. Next, as shown in FIG. 8, the front surface 17 of the suspended panel rear plate 3 of the precast form 1 is vertically contacted with the back surface of the engaging ridge 4 at the upper end of the panel front plate 2 of the lower precast form 1. take down. Next, as shown in FIG. 9, after lowering the precast mold 1 suspended to the engagement meshing portion formed by the engaging ridges 4 and the engaging grooves 5 of the upper and lower precast molds 1, Loosen the suspension wire 13. As shown in FIG. 10, the upper portion of the precast mold 1 in which the suspension wires 13 are loosened is rotated by its own weight, with the upper portion rotating backward in the rotation direction 19 with the engagement meshing portion as a fulcrum,
The upper and lower precast forms 1 are engaged. At this time, a rotating force in the direction of the trajectory 21 acts on the upper precast mold 1 as shown in FIG. Then, the connecting bolt 9 projecting from the panel front plate 2 of the lower precast form 1 is inserted into the anchor plate 19 of the bolt connecting box 6 of the panel rear plate 3 of the upper precast form 1, and the slope adjusting bolt At 18, the gradient of the upper precast mold 1 is adjusted and fixed with the fixing nut 20.

At this time, the butyl rubber waterproof material 7 disposed on the front surface 17 of the panel rear plate 3 of the upper precast mold frame 1 is pressed by the panel plates of the upper, lower, left and right precast mold frames 1 to each other. The space between them is made watertight, and pressure is applied using the internal pressure of the dam concrete to prevent rainwater from entering from outside.

To explain concrete casting,
As shown in FIG. 12, in the method A of the present invention, up to the upper end of the panel rear plate 3 of the lower precast formwork 1, concrete has already been cast and becomes the joint surface 23, and there is the cast concrete 15. When the upper precast form 1 is disposed and fixed with the connecting bolts 9 as described above, concrete is poured to the upper end of the panel rear plate 3 of the upper precast form 1 to form a new concrete 24. Therefore, concrete is not poured into the upper overhang of the panel front plate 2 of the upper precast formwork 1, and the upper overhang of the panel front plate 2 extends upward as a wall. Acts as a prevention wall 27.

According to the method A, the resistance of the internal pressure from the dam concrete applied to the precast form 1 to the fulcrum 22 near the center of the precast form 1 as shown in FIG.
And the upper and lower resistive concrete pressures 26 and 27 are pressed against each other.

On the other hand, as shown in FIG. 13, in the method B of the present invention, concrete has already been cast up to the lower end of the panel front plate 2 of the lower precast formwork 1 and has become the jointing surface 23. There are fifteen. When the upper precast form 1B is disposed and fixed with the connecting bolts 9 as described above, concrete is poured to the lower end of the panel front plate 2 of the upper precast form 1B, and the new concrete 2 is formed.
4 is assumed. Therefore, all the concrete of the panel front plate 2 of the upper precast form 1B is not cast, and the portion of the panel front plate 2 extends upward as a wall. Fall prevention wall 2 larger than
7 works.

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

[0033]

As described above, the precast formwork of the present invention is a discarded formwork, which eliminates the need for scaffolding during construction, does not need to be removed after placing concrete, and uses its own weight and engagement to secure the anchor. Engagement ensures secure engagement, anchors do not rust with alkali, can withstand long-term use, and can be assembled safely and in a short time without complicated construction methods. It is. Also, by combining two types of concrete casting methods, the same formwork can be used to cast concrete on the front and back surfaces of dams with different slopes, making it extremely economical. It has excellent effects.

[Brief description of the 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 the 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 an assembled rear view of the sabo dam precast formwork of the present invention.

FIG. 7 is an assembly procedure diagram showing a state in which the sabo dam precast formwork of the present invention is lifted by a dedicated hanging metal.

FIG. 8 is an assembling diagram showing a vertically suspended state of the sabo dam precast formwork of the present invention using a dedicated hanging bracket.

FIG. 9 is an assembling view showing a vertically suspended engagement state at an engagement portion of the sabo dam precast formwork of the present invention.

FIG. 10 is an assembly procedure diagram showing an engaged rotation state at a meshing portion of the sabo dam precast formwork of the present invention.

FIG. 11 is an assembling procedure diagram showing how the slope is adjusted and fixed at the engagement portion of the sabo dam precast formwork of the present invention.

FIG. 12 is a diagram related to a method A of concrete placing for explaining resistance to internal pressure of dam body concrete.

FIG. 13 is a diagram relating to a method B of concrete placing for explaining the resistance of the dam body concrete to internal pressure.

FIG. 14 is a diagram showing a difference in height position of joints on the front and back of a dam using the same formwork.

15A and 15B are diagrams illustrating a formwork base block, where FIG. 15A is a view as viewed from the upper end of an erected panel, FIG. 15B is a front view of the formwork base block, and FIG. It is a side view of a block.

FIG. 16 is a diagram for explaining a laying state of a formwork foundation block.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Precast formwork 2 Panel front plate 3 Panel rear plate 4 Engagement ridge 5 Engagement groove 6 Bolt connection box removal 7 Waterproof material 8 Fixing rebar 9 Connection bolt 10 Panel rear plate notch 11 Bolt connection 12 Hanging bracket DESCRIPTION OF SYMBOLS 13 Suspension wire 14 Fixing pin 15 Pre-cast concrete 16 Back 17 Front 18 Gradient adjusting bolt 19 Anchor plate 20 Fixing nut 21 Locus 22 Support point 23 Joint surface 24 New concrete 25 Resistance concrete pressure 26 Falling concrete pressure 27 Fall prevention wall 28 Formwork foundation block 29 Rectangular panel 30 Leg 31 Adjustment base 32 Adjustment concrete 33 Foundation concrete 34 Surface joint 35 Back joint 1A Existing form 1B New form

Continuing on the front page (72) Kyohei Aoki 1-7-1, Kyobashi, Chuo-ku, Tokyo Inside Toda Construction Co., Ltd. (72) Inventor Shunichi Hara 225 Yodohoncho, Fushimi-ku, Kyoto Inside Keihan Concrete Corporation ( 72) Inventor Yukio Tanada 225 Yodohoncho, Fushimi-ku, Kyoto-shi Inside Keihan Concrete Industry Co., Ltd. (58) Field surveyed (Int.Cl. ⁶ , DB name) 9/00 101

Claims (7)

(57) [Claims] In a dumping formwork for dam concrete of a sabo dam, a formwork is formed by shifting a rectangular panel front plate and a rectangular panel rear plate up and down or in a zigzag direction in a diagonal direction to lower the panel rear plate. It is composed of an integrally molded precast concrete body that is stretched in the horizontal direction and the panel front plate is relatively stretched in the upper horizontal direction in the symmetrical direction, and the rear side protrudes upward at the upper end of the panel front plate. Forming an engaging ridge, forming an engaging concave groove in which the rear side is fitted upward at the lower end of the panel front plate, and projecting a plurality of connecting bolts on the back surface of the overhanging portion of the panel front plate, At the lower overhang of the panel rear panel, a plurality of connection bolt insertion boxes are provided to penetrate from the front to the rear, and the box extraction is provided with an anchor plate for connecting bolt fastening, and the panel rear panel is tensioned. Water-stopping materials are arranged in a vertical and horizontal cross on the front of the stocking part. A precast formwork for a sabo dam characterized by being installed. 2. A precast mold for a sabo dam according to claim 1, wherein 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. 3. In a lower overhang portion of the panel rear plate,
The sabo dam according to any one of claims 1 and 2, wherein a bolt for adjusting the slope of the formwork is inserted from the back to the front of the rear panel of the panel at a position above the connecting bolt insertion box. Precast formwork. 4. A rectangular panel having the same thickness as a panel front plate of a formwork, and a leg extending rearward from a lower end of the panel to form a lower portion having an L-shaped cross section. 2. The precast mold for a sabo dam according to claim 1, wherein the rear side forms an engaging ridge protruding upward, and a plurality of connecting bolts project from the back surface of the rectangular panel. Formwork foundation block. 5. A precast formwork comprising the panel front plate and the panel rear plate according to claim 1 is laid, and concrete is poured into the precast formwork to form a sabo dam. A method for casting concrete for a sabo dam, characterized in that concrete is poured to the height of the upper end of the rear panel of the panel, and the overhang of the front panel is left as a fall prevention wall protruding upward. 6. A precast formwork comprising the panel front plate and the panel rear plate according to claim 1 is laid, and concrete is poured into the precast formwork to form a sabo dam. A method of placing concrete in 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 projecting upward. 7. A method for forming a sabo dam by placing concrete in a precast formwork, wherein one of the dam front surface side and the dam back surface side is formed by the method according to claim 5 or 6. 7. A concrete pouring method for a sabo dam, characterized in that concrete is poured, and the remaining one on the dam front side or the dam rear side is cast by the remaining method according to any one of claims 5 and 6.