JP3245712B2 - Countermeasures against debris flow and construction methods - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a countermeasure against debris flow, volcanic mudflow, and the like, and a method of constructing the structure.

[0002]

2. Description of the Related Art There has been no established countermeasure for urgently installing a debris flow or volcanic mudflow countermeasure facility immediately after a volcanic eruption.

[0003] In case of emergency, suitable for rapid construction is to manufacture a factory product such as a concrete block in advance, and transport this factory product to the construction site in the event of an emergency to construct a dam or dike. It is possible to do.

[0004]

However, when a debris flow or a volcanic mud flow flows down in a normal concrete block dam or dike, the individual may be transported by the fluid force and may be washed away.

[0005] An object of the present invention is to solve the above-mentioned disadvantages of the prior art and to obtain a sabo dam or a dike with high debris flow resistance to debris flow and volcanic mud flow. It is an object of the present invention to provide a countermeasure structure such as a debris flow that can be rapidly constructed, for example, which does not require a concrete placing operation or the like, and a construction method thereof.

[0006]

In order to achieve the above-mentioned object, the present invention provides, as a countermeasure for debris flow or the like, firstly, a rectangular parallelepiped in which a concrete-filled steel pipe is erected and a through-hole is formed in the steel pipe. It consists of a sabo dam or a dike built by stacking concrete blocks in a skewered manner on this concrete-filled steel pipe. The concrete block forms through-holes in the steel pipes that open vertically, and these through-holes Second, concrete-filled steel pipes have P inside
Prestressed concrete (PC) filled steel pipes with C steel rods placed. Third, concrete blocks covered with through holes in steel pipes with impact buffer. Fourth, concrete blocks penetrated steel pipes to the left and right. The gist of the present invention is to form holes and alternately stack them while aligning the through holes.

As a method of constructing a structure for preventing debris flow or the like, first, a rectangular parallelepiped concrete block in which through-holes of steel pipes opening vertically are formed on the left and right sides is formed in a zigzag or a staggered manner while the through-holes are aligned. The steel pipes are concrete-filled steel pipes by vertically stacking them one after another, inserting steel pipes into vertically continuous through holes and skewing the rectangular parallelepiped concrete block in a skewered manner to construct a sabo dam or a dike. The gist is a prestressed concrete (PC) -filled steel pipe in which a PC steel rod is arranged.

According to the first aspect of the present invention, it is possible to rapidly construct a sabo dam and a dike just by stacking rectangular parallelepiped concrete blocks, and the rectangular parallelepiped concrete blocks are concrete-filled steel pipes. Is fixed in a skewered manner with the shaft as an axis, the individual blocks do not flow away even when subjected to the fluid force of the debris flow, and the debris flow load can be absorbed by the deformation of the steel pipe at the time of the debris flow collision.

According to the second and fifth aspects of the present invention, in addition to the above functions, the concrete-filled steel pipe penetrating through the rectangular parallelepiped concrete block is made of a concrete-filled PC steel pipe having high strength against bending stress. It is possible to have a structure in which the connectivity of the blocks is enhanced, and it is possible to improve the ability to absorb debris flow load due to deformation.

According to the third aspect of the present invention, by covering the through-hole with the shock absorbing material, the rectangular parallelepiped concrete block collides with the concrete-filled steel pipe and breaks when installed or subjected to a debris flow load. Can be prevented, and the large toughness of the steel pipe can be effectively used.

According to the first and fourth aspects of the present invention, the rectangular parallelepiped concrete blocks can be stacked alternately to have a structure with improved connectivity.

According to the fourth aspect of the present invention, both the concrete block and the steel pipe are prepared before the eruption, stocked at an appropriate location, and transported to the construction location during the eruption for construction. Rapid construction is possible, for example, because the concrete pouring work and the like performed in a normal concrete sabo dam are not required.

[0013]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, embodiments of the present invention will be described in detail. FIG. 1 is a front view showing an embodiment of a countermeasure structure against debris flow or the like according to the present invention, and FIG. FIG. 3 is an overhead view in the case where such a dam 1 is provided.
This indicates an area where there is a possibility of flooding, and where it is difficult to rapidly construct a sabo dam and save labor.

The countermeasure structure against debris flow or the like according to the present invention comprises a combination of a rectangular parallelepiped concrete block 2 and a concrete-filled steel pipe 3.

First, the rectangular parallelepiped concrete block 2 will be described. As an example, as shown in FIGS. 4 and 5, a rectangular parallelepiped block having two through holes 4 on the right and left of a concrete-filled steel pipe 3 is shown.

In order to facilitate the insertion of the concrete-filled steel pipe 3, the through-hole 4, which opens in the vertical direction, has a larger diameter with a margin as compared with the steel pipe diameter of the concrete-filled steel pipe 3. Further, the through hole 4 was covered with a butyl rubber seal or the like as an impact buffer 5. The impact buffer 5 may have a flange 5a in order to prevent the impact buffer 5 from coming out of the hole.

FIGS. 6 to 8 show concrete-filled steel pipes 3, which can be used as steel pipe piles and may be ordinary concrete-filled steel pipes. In order to increase the height, an anchor plate 6 as a horizontal partition plate is disposed at the upper and lower ends of the inside, and an unbonded PC steel rod 8 whose end is fastened to the anchor plate 6 with a nut 5 is disposed. Configured as prestressed concrete (PC) filled steel pipe.

The dam 1 is erected around a concrete-filled steel pipe 3 and is formed by stacking rectangular parallelepiped concrete blocks 2 in a skewered manner on the concrete-filled steel pipe 3. The dam 1 is a sabo dam or a dike.

Next, a method of constructing a structure for preventing debris flow or the like according to the present invention will be described. 2 and 3, reference numeral 9 denotes an embankment foundation, which is preliminarily constructed at a necessary place in a case where a debris flow and volcanic mudflow countermeasure facility needs to be constructed urgently. In addition, a flat step is secured for the sleeve 10 so that the rectangular parallelepiped concrete block 2 can be placed.

The rectangular parallelepiped concrete block 2 and the concrete-filled steel pipe 3 are prepared in advance before the eruption, a suitable number of them are stocked at an appropriate location, and transported to the construction location during the eruption for construction. At this time, the concrete-filled steel pipe 3 is configured as a prestressed concrete (PC) -filled steel pipe by disposing an unbonded PC steel rod 8.

[0021] Rectangular concrete block 2 with a crane
The through-holes 4 are vertically continuous in the rectangular parallelepiped concrete block 2 thus stacked, and the concrete-filled steel pipe 3 is inserted into the continuous through-holes 4.
And fix the rectangular parallelepiped concrete block 2 in a skewered manner. The gap between the concrete-filled steel pipe 3 and the rectangular parallelepiped concrete block 2 is filled with sand.

In the present embodiment, the rectangular parallelepiped concrete blocks 2 are stacked alternately (in a staggered or orthogonal manner). At this time, the rectangular parallelepiped concrete blocks 2 have through holes 4 on the left and right sides. Since the left and right through holes 4 alternately correspond to each other to form a continuous hole, the concrete-filled steel pipe 3 was inserted here.

As described above, in addition to the method of sequentially stacking the rectangular parallelepiped concrete blocks 2 and inserting the concrete-filled steel pipes 3 into the through holes 4, the rectangular parallelepiped concrete blocks 2 are inserted into the standing concrete-filled steel pipes 3. A method of stacking in a skewered shape can also be adopted.

FIGS. 1 and 2 show an example of a sabo dam. The concrete block has a rectangular parallelepiped shape.
The slope of the crotch is straight and the construction is simple.

FIG. 9 is a schematic diagram showing the construction of the sabo dam or the dike constructed as described above.
Since the concrete-filled steel pipe 3 and the rectangular parallelepiped concrete block 2 and the rectangular parallelepiped concrete block 2 are not integrated with each other, the debris flow load is absorbed by the deformation that the rectangular parallelepiped concrete block 2 shifts.

The sand packed in the gap between the rectangular parallelepiped concrete block 2 and the concrete-filled steel pipe 3 allows the concrete steel pipe to deform here.

Further, since the rectangular parallelepiped concrete block 2 and the concrete-filled steel pipe 3 are not integrated, when the basin changes due to an eruptive activity, it can be dismantled and moved to another area.

[0028]

As described above, the countermeasure structure against debris flow and the like and the method of construction according to the present invention can provide a sabo dam or a dike with high debris flow resistance to debris flow and volcanic mud flow. Rapid construction is possible, for example, by eliminating the need for concrete pouring work and the like performed in ordinary concrete sabo dams.

[Brief description of the drawings]

FIG. 1 is a front view showing an embodiment of a countermeasure structure against debris flow or the like of the present invention.

FIG. 2 is a plan view showing an embodiment of a countermeasure structure against debris flow or the like according to the present invention.

FIG. 3 is an overhead view showing one embodiment of a countermeasure structure against debris flow or the like according to the present invention.

FIG. 4 is a plan view of a rectangular parallelepiped concrete block used in the present invention.

FIG. 5 is a partially cutaway side view of a rectangular parallelepiped concrete block used in the present invention.

FIG. 6 is a cross-sectional plan view of a concrete-filled steel pipe used in the present invention.

FIG. 7 is a partially cutaway plan view of a concrete-filled steel pipe used in the present invention.

FIG. 8 is a partially cutaway side view of a concrete-filled steel pipe used in the present invention.

FIG. 9 is a schematic diagram illustrating an operation of a countermeasure structure for debris flow or the like according to the present invention.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Dam 2 ... Rectangular parallelepiped concrete block 3 ... Concrete filled steel pipe 4 ... Through-hole 5 ... Impact buffer 5a ... Flange 6 ... Anchor plate 7 ... Nut 8 ... PC steel bar 9 ... Embankment base 10 ... Sleeve

Continuation of the front page (72) Inventor Komatsuzawa No. 121-1, Shibukawa-shi, Gunma Prefecture Ministry of Construction Kanto District Construction Bureau Tonegawa Water System Sabo Works Office (72) Inventor Kenji Nagata 1-1-10 Nakameguro, Meguro-ku, Tokyo No. 21 Yachiyo Engineering Co., Ltd. (56) References JP-A-9-228348 (JP, A) JP-A-61-151303 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB (Name) E02B 7/02

Claims (5)

(57) [Claims] 1. A sabo dam or a dike constructed by erected around a concrete-filled steel pipe and stacking rectangular parallelepiped concrete blocks having through-holes in the steel pipe in a skewered manner. The concrete block is a countermeasure against debris flow or the like, characterized in that the through holes of steel pipes which open vertically are formed on the left and right, and the through holes are aligned and stacked in a staggered or orthogonal manner. 2. The structure according to claim 1, wherein the concrete-filled steel pipe is a prestressed concrete (PC) -filled steel pipe in which a PC steel rod is disposed. 3. The structure for preventing debris flow or the like according to claim 1, wherein the concrete block covers a through hole of the steel pipe with an impact buffer. 4. A rectangular parallelepiped concrete block in which through-holes of steel pipes opening in the vertical direction are formed on the left and right is stacked in a staggered or orthogonal manner while aligning the through-holes, and the steel pipes are inserted into vertically continuous through-holes. A method for constructing a structure for countermeasures against debris flow, comprising constructing a sabo dam or a dike by fixing a rectangular parallelepiped concrete block in a skewered manner. 5. The steel pipe is a concrete-filled steel pipe, and a prestressed concrete (P) having a PC steel rod disposed therein.
C) The method for constructing a structure for preventing debris flow or the like according to claim 4, wherein the structure is a filled steel pipe.