JPH0565655B2 - - Google Patents

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention relates to a slope protection structure constructed by assembling formwork on a slope and pouring concrete in order to prevent slope collapse. .

[Prior art]

In order to prevent slopes from collapsing, slope protection structures have been developed that are constructed by assembling formwork on the ground and pouring concrete. In such construction methods, porous weir plates that can be buried are widely used to simplify construction on slopes. A porous weir plate is one in which many voids are formed in the weir plate through which concrete can pass, and it is a plate-shaped punched metal, or a mesh-shaped one such as expanded metal or crimped wire mesh rather than a plate-shaped one. Can be widely adopted.

Two such porous weir plates are erected parallel to the ground, and concrete is poured between the weir plates to form a structure.

[Problems to be solved by this invention]

A problem when pouring concrete between porous weir plates is that relatively large aggregates in the concrete, often coarse aggregate, protrude outward from the mesh of the weir plates.

When finishing a structure, the surface is smoothed, but if aggregate is protruding, the surface cannot be made smooth. Also, during pouring, large aggregates collided with the weir plates, sometimes pushing and bending the weir plates themselves.

This invention was made in order to solve the above-mentioned problems, and the purpose is to provide a construction method for a slope protection structure that can smooth the surface and does not damage the weir board. shall be.

Another object of the present invention is to provide a porous double dam plate with good workability for use in the above-mentioned construction method.

[Means to solve the problem]

The method for constructing a slope protection structure according to this invention is as follows:
It uses two outer porous weir plates and two inner porous weir plates placed between the outer weir plates.

The use of pre-integrated porous double dam plates in this construction method simplifies construction. Porosity means that concrete has many voids through which large non-aggregate parts, i.e., paste-like parts, can pass through. In addition to plate-shaped punched metal, mesh-shaped materials such as expanded metal and crimped wire mesh can also be used. . The outer weir plate located on the outside and the inner weir plate located on the inside are faced in parallel and are separated by an appropriate distance so as to maintain the distance between them. A suitable distance between the two is about 10 to 50 mm, and in order to integrate them, it is conceivable to pass bolts through them and tighten both weir plates with nuts. Other methods such as welding and other methods can be used.

Use the same shape and size for the inner and outer weir plates, change the diameter of the punch holes if the weir plate is made of punched metal, change the flow of the slits cut into the steel plate if the weir plate is made of expanded metal, and change the width of the slits cut into the steel plate if the weir plate is made of punched metal. By changing the pitch between the wire rods, the area of each hole can be changed.

Furthermore, a long ruler can be fixed continuously in the longitudinal direction to the upper end of the outer weir plate. The long ruler can be made of stainless steel, ceramic, etc., and various shapes such as a narrow flat plate or a round bar can be used. Various means such as welding can be used for fixing.

The two sets of double weir plates integrated as described above are erected in parallel on the ground with the inner weir plates facing each other and the outer weir plates placed on the outside. Reinforcing bars will be placed between the double weir plates, and the distance between the double weir plates will be maintained by spacers.

Concrete will be poured between both inner weir plates.

[Effect]

Aggregates larger than each hole of the inner weir plate in the concrete poured between the inner weir plates are retained by the inner weir plate, and coarse aggregate smaller than each hole of the inner weir plate, that is, mostly fine aggregate, is retained by the inner weir plate. The paste-like cement containing the water flows through the holes in the inner weir plate and fills the space between the inner and outer weir plates. At this time, if the area of the hole in the inner weir plate is large, it is easy for the cement to pass through. In addition, large aggregates are retained by the inner weir plate and do not protrude to the surface through the holes in the outer weir plate.

By leveling the concrete surface according to the ruler at the top of the outer weir board, the surface can be easily and accurately finished.

〔Example〕

Hereinafter, the present invention will be explained in detail based on embodiments shown in the drawings.

In the figure, 1 is a porous outer weir plate, and 2 is a porous inner weir plate, both of which are made of expanded metal. In the embodiment, a porous double dam plate A in which both are integrated in advance is used.

Each hole in the inner weir plate 2 has a longer slit cut into the iron plate, and has a larger opening area than each hole in the outer weir plate 1. The length of the slit is 10 for inner weir plate 2.
~40mm, and the outer weir plate 1 is 30~100mm. Face both parallelly, pass bolt 3 between them,
They are integrated by tightening with nuts 4.

A ruler 5 made of stainless steel is fixed to the upper end of the outer weir plate 1 continuously in the longitudinal direction. A ruler is fixed to the back of the surface of the outer weir board 1 facing the inner weir board 2.

The double weir plates A, A as described above are replaced with inner weir plates 2, 2.
stand parallel to the ground, facing each other.
In the embodiment, the entire structure is assembled in a grid pattern with vertical structures that slope along the slope and horizontal structures that intersect with the vertical structures, and the formwork is assembled in this way.

Reinforcing bars 6 are arranged between double dam plates A and A. The reinforcing bars 6 may be provided only in the longitudinal direction as shown in FIG. 3, but hoop reinforcing bars 7 may be arranged so as to wrap around their outer peripheries as shown in FIG. 9.

A spacer 8 made of a steel rod or the like is inserted between the double weir plates A and A, and the spacer 8 is bent or fixed with a nut to maintain the distance between the two.

Concrete 9 is placed between the left and right inner weir plates 2, 2 of the formwork assembled as described above. Aggregates 10 larger than each hole of the inner weir plate in the concrete 9 are retained by the inner weir plate 2, and only paste-like cement containing small aggregates flows between the inner weir plate 2 and the outer weir plate 1. .

The top and side surfaces of the structure are leveled along the rulers at the upper ends of the outer weir plates 1 and 1, and the surface of the concrete 9 is finished smooth.

In the above-mentioned embodiment, a porous double dam board in which the outer dam board 1 and the inner dam board 2 were integrated in advance was used, but they may be erected separately on the ground to maintain the respective intervals.

〔Effect of the invention〕

The present invention has the above configuration and can obtain the following effects.

○B Since the structure is doubled by the outer weir plate located on the outside and the inner weir plate located between them, large aggregates in the concrete poured between the inner weir plates are retained and the holes in the outer weir plate are It does not protrude from the surface, and the surface can be finished smoothly using only the paste-like cement.

○B By using a porous double dam board in which the outer dam board and the inner dam board are integrated in advance, it is possible to save labor in erecting the dam board, making construction easier and faster. .

○C By making each hole in the inner weir plate larger than the opening area of each hole in the outer weir plate, the passage of cement becomes easier, and a gap is created between the outer weir plate and the inner weir plate. It becomes difficult.

○D By fixing a ruler to the upper end of the outer weir board, the concrete surface can be finished smoothly and easily.

[Brief explanation of the drawing]

Fig. 1 is a perspective view of the construction state of this invention, Fig. 2 is a sectional view of the structure constructed according to this invention, and Fig. 3 is a perspective view of the construction state of the invention.
The figure is a partial perspective view of the structure, and FIG. 4 is a sectional view of the structure with the formwork assembled. A... Porous double dam board, 1... Outer dam board, 2...
Inner weir board, 3... bolt, 4... nut, 5... ruler, 6... reinforcing bar, 7... hoop reinforcement, 8... spacer, 9... concrete, 10... aggregate.

Claims (1)

[Scope of Claims] 1. In the case of constructing a slope protection structure with a rectangular cross section, which is constructed by building a formwork on the ground and pouring concrete into the formwork, two porous outer weirs are used. A board is erected parallel to the ground, two porous inner dam boards are erected in parallel between these two outer dam boards, and an inner formwork and an outer formwork are assembled, and each of the inner dam boards is The holes are made larger than each hole in the outer weir plate, concrete is poured into the inner formwork, and the inner weir plate is used to prevent aggregates larger than the holes in the inner weir plate from flowing outward in the concrete. A construction method for a slope protection structure, characterized in that aggregate and cement smaller than each hole in the inner weir plate are allowed to flow out of the concrete between the inner weir plate and the outer weir plate. 2. The method for constructing a slope protection structure according to claim 1, wherein expanded metal is used as the porous weir plate. 3. The method for constructing a slope protection structure according to claim 1, wherein a crimp wire mesh is used as the porous weir plate. 4. A porous double dam board, characterized in that a porous inner dam board and a porous outer dam board are appropriately separated and faced in parallel, and fixed while maintaining the distance between them.