JP2000226840A - Construction method for sand control dam using precast concrete block and joining member therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a construction method for a highly economically efficient sand control dam using precast concrete blocks instead of a cast-in-place construction method, and a joining member used therefor. SOLUTION: A sand control dam 1 is formed by inputting and embedding pebbles 6 in a space part formed between the wall bodies 5, 5 by forming a pair of almost recessed wall bodies 5, 5 by muitually joining blocks 2 by inserting a joining member 4 into a through hole 3 formed by gathering corner parts of the respective blocks 2 by geometrically arranging and heaping up the blocks 2 composed of a plurality of almost triangular precast concrete. Then, the blocks 2 have truncated parts 7 in respective top parts, and these blocks are gathered to form the through hole 3 in a central part. The joining member 4 is composed of a tube body 10 or a bar body 12 having a block sandwiching member 11 for sandwiching the blocks 2 by a pair of plate bodies 15 in both end parts.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing a sabo dam using precast concrete blocks and a connecting member thereof, and more particularly, to a method for constructing a sabo dam on a river in a mountainous remote area, which is convenient, easy and economical. It is formed of precast concrete blocks interconnected by connecting members so that they can be constructed with high efficiency.

[0002]

2. Description of the Related Art Sabo dams are dams that prevent conglomerate from flowing downstream in order to prevent the riverbed of rivers containing a large amount of conglomerate from rising, and are used in quite a number of rivers in Japan.

Conventionally, in order to construct a sabo dam, an in-situ casting method is generally used. That is, concrete casting equipment and materials are transported to a remote mountainous area, a formwork is built in a river, and ready-mixed concrete is used in the formwork. It is cast and solidified after curing.

[0004]

However, transporting equipment and materials to a remote mountainous area is not necessary when the road is constructed so that vehicles can pass through it. It is limited, and there is no other than relying on a ropeway with small carrying capacity and manual transportation,
Therefore, it is known that building one sabo dam that meets the design is very costly.

Accordingly, the present invention provides a convenient and economical construction method of a sabo dam using a precast concrete block instead of a cast-in-place method, and a connecting member used therefor.

[0006]

According to the present invention, there is provided a method for constructing a sabo dam using a precast concrete block, comprising a plate of a specific shape formed of a precast concrete block, and a plurality of the plates are geometrically formed. When aligned, a plurality of blocks whose corners are gathered to form a through hole at the center are stacked, and the blocks are inclined with respect to each other on the upstream side and the downstream side separated by the required width of the dam or A pair of vertical and parallel walls is constructed by inserting a connecting member into the through hole and integrally connecting the pair of walls on the upstream side and the downstream side. It is characterized by the construction of a sabo dam by introducing conglomerate etc. into the space formed in the area.

The block is a polygonal precast concrete slab, and a truncated portion for forming the through hole is formed at each corner, and the connecting member is It is characterized by comprising a pipe or a rod inserted into the through hole, and a block holding member detachably connected to both ends of the pipe or the rod and holding the thick portion of the block.

[0008] Therefore, there is the convenience and economy that a sabo dam can be constructed with a concrete block that is extremely portable as compared with equipment and materials, instead of being cast in place.

The connecting member of the sabo dam using the precast concrete block according to the present invention is a polygonal precast concrete slab in which a plurality of blocks each having a truncated head at each corner are provided. A pipe or rod inserted in a through-hole formed in the truncated portion in a geometrically aligned manner, and a thick portion of the block detachably connected to both ends of the pipe or rod. And a block holding member for holding the block.

[0010] The block holding member is characterized in that a pair of plate members abutting on the front surface or the back surface of the block are separated by the thickness of the block and integrally connected by a spacer member. . Further, the block holding member is disposed at the both ends symmetrically at a predetermined angle with respect to the tube or the rod. Further, the block holding member is provided with an angled member having an inclined surface slidably in contact with the pair of plate members so as to have the predetermined angle of inclination.

Further, the spacer is a circular or polygonal cylinder, and the tube or rod and the block holding member are each made of metal. Alternatively, the bar and the block holding member are each made of metal, concrete, plastic, or a combination thereof.

Therefore, a sabo dam can be constructed by stacking concrete blocks.
Since the sabo dam is easy to work without transporting materials, it is possible to eliminate various inconveniences caused when concrete is cast in remote mountainous areas as a sabo dam.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, a sabo dam 1 is formed by stacking a plurality of substantially triangular precast concrete blocks 2 in a geometrically aligned manner, and a through hole 3 formed by collecting the corners of each block 2. A pair of substantially concave walls 5 and 5 are formed by inserting the connecting members 4 (see FIGS. 2 and 3) into each other and connecting the blocks 2 to each other, and formed between the walls 5 and 5. It is formed by burying a conglomerate 6 into the space. As shown in FIG. 9, the block 2 has a truncated portion 7 at each apex and has a concave shape in which the through holes 3 are formed at the center when they are assembled. A slit 2b for punching is formed. In addition, it is good also as a mere lithographic plate, without forming the peripheral wall part 2a.

That is, in a plate of a specific shape made of a precast concrete block, when a plurality of them are geometrically aligned, corners are gathered to form a through hole at the center thereof. A plurality of blocks 2 are stacked, and a pair of walls 5 inclined or perpendicular to each other are provided on the upstream side and the downstream side separated therefrom by a required width of the dam.
5, a connecting member 4 is inserted into the through hole 3 of the pair of upstream and downstream walls 5, 5 to be integrally connected, and the pair of walls 5, 5 are connected to each other. Then, the natural stone, the conglomerate 6 and the like 6 on the site are charged and filled into the space formed at the site to construct the sabo dam 1.

As shown in FIG. 4, the connecting member 4 includes a block holding member 11 at both ends of a pipe 10 made of metal having a length substantially equal to the required width W (wall thickness) of the sabo dam 1. The pipe body 10 is symmetrically connected and arranged, and the pipe body 10 projects from the wall body 5 and is open to the outside. Therefore, water stored in the upstream wall body 5 flows into the pipe body 10 and flows downstream. It can be released from the side wall 5 side.

As shown in FIG. 5, the connecting member 4 includes a block holding member 11 at both ends of a rod 12 made of metal having a length substantially equal to the required width W (thickness dimension) of the sabo dam 1. They may be arranged orthogonally or inclined inwardly to be symmetrically connected to each other. The connecting members 4 are distinguished into those of the tube body 10 and those of the rod body 12, and the places to be arranged are selected and appropriately mounted as necessary. Further, a concrete coupling member 4 shown in FIG. 6 described later is also an object to be selected.

As shown in FIGS. 2 and 3, the sabo dam 1 is a wall 5 at a portion of the riverbed 8 which comes into contact with the foundation stone 9.
Since the distance between them is the largest, and it is customary to construct them gradually smaller upward, the lengths of the coupling members 4 are different at the upper and lower stages. However, since the inclination angles θ of the wall bodies 5 and 5 are the same in the uppermost stage and the lower stage, the same angling members 17 to be described later can all be used, and only one type is sufficient. Further, the walls 5, 5 may be vertically erected without being inclined and may be constructed in parallel with each other.

As shown in FIGS. 4 and 5, the block holding member 11 covers a pair of substantially circular or square (see FIG. 8) plate bodies 15 having an area covering the through holes 3 and covering the corners of the block 2. The plate body 15 and the spacer 16 are made of metal such as steel, and the tube body 10 and the rod body 12 can be loosely fitted to the center of the plate body 15 and the spacer 16. It has a shaft hole 15a, and the spacer 16 surrounds the shaft hole 15a.

On both left and right sides of the block holding member 11, nuts 18 and 17 are attached to both ends of the tube 10 or the rod 12 so as to abut against the plates 15 and 15.
At 18, it is arranged by tightening. The distance between the plates 15, that is, the axial length of the spacer is substantially equal to the thickness of the block 2, that is, the thickness at the truncated corner.
The angle members 17, 17 are not used when the walls 5, 5 are constructed vertically and parallel to each other.

As shown in FIGS. 7 and 8, the angling member 17 is a wedge-shaped member having one side surface having an inclined surface 19 having the same angle as the inclination angle θ of the wall member 5. 19
The shaft hole 20 is formed so as to be arranged symmetrically at both ends of the tube body 10 or the rod body 12 so as to be in contact with each other. The shaft hole 20 can loosely fit the tube body 10 and the rod body 12. The nut 18 can be screwed into a thread portion 21 formed at the end of the tube 10 or the rod 12. When the pair of the angle holding members 17 hold the block holding member 11 and pass through the tube 10 or the rod 12, the block holding member 11 is inclined with respect to them as shown in FIGS. It is attached. This inclination angle is the same as the inclination angle θ of the wall 5.

As shown in FIG. 6, the connecting member 4 can be integrally formed of concrete. That is, as in the usual way of concrete molding, the shape of the connecting member 4 is created by a core material, fitted to a mold, and covered with concrete. In the figure, the portion 22 corresponding to the block holding member is formed perpendicularly to the portion 23 corresponding to the tube or the rod, but it is also possible to form it symmetrically and inclined in the same manner as described above. Further, the portion 22 corresponding to the tube or the rod can be freely formed as a tube. 24 is a portion corresponding to the spacer 16.

The sabo dam 1 thus constructed is shown in FIG.
As shown in the figure, water flows to the downstream side from a concave portion 25 formed in a substantially central portion of the pair of wall bodies 5 and 5 as usual, and
As shown in FIG. 3, the water 27 blocked by the high convex portions 26 on both sides of the concave portion 24 is discharged from the pipe 10 to the downstream side,
Sand, stones 28 and the like are blocked by the wall 5 on the upstream side. A structure that can sufficiently withstand water pressure and conglomerate pressure can be provided by making the left and right end portions of the wall bodies 5 and 5 deeply supported by the banks 29 and 29 (see FIG. 1) of the river.

In the above embodiment, the block 2
Used a block made of a substantially triangular precast concrete slab. However, the shape of the block 2 may be a polygon other than a triangle, such as a quadrangle, a pentagon, or a hexagon. As long as the through-hole 3 through which the member 4 is inserted can be formed, several types of precast concrete slabs such as rectangular or trapezoidal lithographic plates obtained by appropriately cutting the entire shape of the wall 5 with high portability may be used.

[0024]

According to the present invention described above, the convenience and economy that the sabo dam can be constructed with high efficiency rather than cast-in-place with a concrete block having extremely high portability as compared with equipment and materials for concrete placing. Has the property. Also,
By stacking concrete blocks, a sabo dam can be constructed with high efficiency, making it easy to work without transporting equipment and materials, and eliminating various inconveniences associated with placing concrete as a sabo dam in remote mountainous areas. it can.

[Brief description of the drawings]

FIG. 1 is a perspective view of a sabo dam according to the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view taken along the line BB of FIG. 1;

FIG. 4 is a front view (A) and a side view (B) of the coupling member.

FIG. 5 is a front view (A) and a side view (B) showing another example of the coupling member.

FIG. 6 is a front view (A) and a side view (B) showing still another example of the coupling member.

FIG. 7 is an exploded front view of the coupling member.

FIG. 8 is a perspective view of a main part of the coupling member.

FIG. 9 is a front view (A), a side view (B), and an AA sectional view (C) of the precast concrete block.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Sabo dam 2 ... Block 3 ... Through-hole 4 ... Coupling member 5 ... Wall body 6 ... Conglomerate etc. 7 ... Truncated part 10 ... Tube body 11 ... Block holding member 12 ... Bar body 15 ... Plate body 16 ... Spacer 17 ... Angling member 18 ... Nut 19 ... Slope 20 ... Shaft hole

Claims (9)

[Claims] 1. A slab of a specific shape comprising a precast concrete block, wherein when a plurality of them are geometrically aligned, corners are gathered to form a through hole at the center thereof. A plurality of blocks are stacked, and a pair of walls inclined or perpendicular to each other are inserted into the through hole at the upstream side and at the downstream side separated therefrom by a required width of the dam, and the upstream side is inserted through the through-hole. And a pair of wall bodies on the downstream side are integrally connected to each other, while a conglomerate or the like is injected into a space formed between the pair of joined wall bodies to construct a sabo dam. Construction method of sabo dam using precast concrete block. 2. The precast concrete according to claim 1, wherein said block is a polygonal precast concrete slab, and each corner has a truncated portion for forming said through hole. Construction method of sabo dam using concrete block. 3. The connecting member is a tube or rod inserted into the through hole, and a block holding member detachably connected to both ends of the tube or rod so as to hold a thick portion of the block. The method for constructing a sabo dam using the precast concrete block according to claim 1 or 2. 4. A polygonal precast concrete slab, wherein a plurality of blocks each having a truncation at each corner are geometrically aligned to form a through-hole formed at said truncation. A precast concrete block, comprising: a pipe or a rod inserted into the pipe; and a block holding member that is detachably connected to both ends of the pipe or the rod and holds the thick portion of the block. The connecting member of the used sabo dam. 5. The block holding member is characterized in that a pair of plate members abutting on the front surface or the back surface of the block are integrally separated by a spacer member while separating the thickness of the block. A connecting member for a sabo dam using the precast concrete block according to claim 4. 6. The precast concrete according to claim 4, wherein the block holding members are disposed at the both ends symmetrically with respect to the pipe or the rod at a predetermined angle. A connecting member for a sabo dam using blocks. 7. The block holding member is disposed with an angle member having an inclined surface that slides on the pair of plates to have the predetermined angle of inclination. 7. A connecting member for a sabo dam using the precast concrete block according to any one of 6 above. 8. The connecting member for a sabo dam using a precast concrete block according to claim 5, wherein the spacer is a circular or polygonal cylindrical body. 9. The system according to claim 4, wherein the tube or the rod and the block holding member are each made of metal, concrete, plastic or a combination thereof.
A connecting member for a sabo dam using the precast concrete block according to any one of the above.