JPH1129920A - Driftwood prevention fence - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a driftwood fence which can be restored easily at low cost if broken by an avalanche of sand and stones, etc. SOLUTION: A driftwood fence is constructed by installing a plurality of fence component pieces 11 on the bed, etc., of a ravine at intervals. A plurality of buried rectangular steel pipes 13 are buried in a concrete foundation 12 at intervals to form a tubular hole. A rectangular steel pipe 15 for a pile is inserted into each buried rectangular steel pipe 13. Wedge parts 16, 17 are formed respectively on the inner surface of each buried rectangular steel pipe 13 and the outer surface of each rectangular steel pipe 15 for the pile. When the rectangular steel pipe 15 for the pile is inserted in the buried rectangular steel pipe 13, the rectangular steel pipe 15 for the pile is secured to the buried rectangular steel pipe 13 by wedge action that works between the wedge parts 16, 17. The rectangular steel pipe 15 for the pile is locked in place by passing a pin 18 through it. Should the rectangular steel pipe 15 for the pile be broken by an avalanche of sand and stones, etc., only the rectangular steel pipe 15 for the pile need be replaced, so that restoration work is easy and the cost of restoration can be reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a driftwood prevention fence installed on a riverbed or the like in order to stop drifting of driftwood.

[0002]

2. Description of the Related Art Driftwood prevention fences are installed on riverbeds in valleys to prevent driftwood from flowing further downstream and causing damage, and keep the driftwood without blocking the flow of water. Conventionally, for example, as a steel driftwood prevention fence, as shown in FIG.
As shown in FIG. 8, a separated type structure in which the concrete pipe 2 is laid directly across the flow and is directly embedded at an interval, or, although not shown, a grid fence in which steel pipes are assembled in a grid. An integrated structure in which the lower part of the body is directly embedded in a concrete foundation is used. There are various other structures for the fence components and the fence body, but all of the conventional driftwood prevention fences have a structure in which the lower part of the fence components and the fence body are directly embedded in a concrete foundation.

[0003]

However, not only driftwood does not always flow to the driftwood prevention fence, but also debris flows may come in. At that time, the fence component 1 and the fence body may be damaged. is there. If it is damaged, it is necessary to replace the fence component 1 or the fence, but it is not easy to replace the fence component 1 or the fence with the lower part embedded directly in the concrete foundation, and the cost is high. The present invention
An object of the present invention is to provide a driftwood prevention fence that can be easily and inexpensively replaced even if it is damaged by debris flow or the like.

[0004]

According to a first aspect of the present invention, there is provided a driftwood prevention fence, comprising: a plurality of cylindrical holes provided on a foundation of a driftwood prevention fence at intervals in a width direction of a river; Characterized in that the lower part of the is inserted detachably.

A second aspect of the present invention is the driftwood prevention fence according to the first aspect, wherein the cylindrical hole and the pile body are provided vertically.

According to a third aspect of the present invention, in the driftwood prevention fence of the first aspect, the cylindrical hole and the pile body are provided so as to be inclined in the upstream direction with respect to the flow direction of the river.

According to a fourth aspect of the present invention, there is provided a driftwood prevention fence, wherein a lower portion of a pile body is detachably inserted into a cylindrical hole provided at an interval in a driftwood prevention fence foundation, and an inner surface of the cylindrical hole and a pile are connected to each other. The pile body is fixed to a cylindrical hole by driving a wedge member into a gap between the body and the outer surface of the body.

According to a fifth aspect of the present invention, there is provided a driftwood preventing fence, wherein a lower portion of a pile body is detachably inserted into a cylindrical hole provided at an interval on a driftwood preventing fence foundation, and an inner surface of the cylindrical hole and a pile are provided. The pile body is fixed to the cylindrical hole by a wedge action between wedge portions formed on the outer surface of the body and contacting each other at an inclined surface.

According to a sixth aspect of the present invention, there is provided the driftwood prevention fence according to any one of the first to fifth aspects, wherein the tubular hole is formed by embedding a steel pipe in the driftwood prevention fence foundation, and a steel pipe having a diameter smaller than the inner diameter of the steel pipe is used as the pile body. It is characterized by having been.

According to a seventh aspect of the present invention, in the driftwood prevention fence according to the sixth aspect, the steel pipe forming the cylindrical hole and the steel pipe for the pile body each use a square steel pipe, and the inner surface of the square steel pipe in the cylindrical hole has a surface. A wide plate-shaped wedge portion is formed, and a tapered rib-shaped wedge portion is formed on an outer surface of the square steel pipe as the pile body.

According to an eighth aspect of the present invention, in the driftwood prevention fence of the first to seventh aspects, a hook hook for lifting is attached to an upper end of the pile body.

[0012]

FIG. 1 is a block diagram showing an embodiment of the present invention.
This will be described with reference to the embodiment shown in FIG. FIG. 1 is a front view of a driftwood prevention fence 10 according to one embodiment of the present invention, FIG. 2 is an enlarged view of one fence component piece 11 in FIG. 1, and FIG.
FIG. 3B is a plan view of FIG. 3A, and FIG.
It is a partial notch enlarged view of the principal part in (a). As shown in these figures, this driftwood prevention fence 10 has a plurality of square steel pipes 13 with a base plate 13a welded and fixed to a concrete foundation (driftwood prevention fence foundation) 12 which is cast to cross the flow. The hollow steel pipe (embedded square steel pipe) 13 is pierced so as to be slightly exposed at its upper end to form a cylindrical hole. 15), and the wedge portion 1 fixed to the inner surface of the embedded square steel pipe 13
The square steel pipe 15 for the pile body is embedded by the wedge action between the steel pipe 6 and the wedge part 17 formed on the outer surface of the square steel pipe 15 for the pile body.
It is fixed to 3. Further, in this embodiment, a pin 18 is penetrated through the embedded square steel pipe 13 and the pile steel pipe 15 for the pile at the portion of the embedded square steel pipe 13 protruding from the concrete foundation 12 to prevent the square steel pipe 15 for the pile from coming off. I have. A hook hook 15 for lifting the square steel pipe 15 for piles at the time of construction is provided at the upper end of the square steel pipe 15 for piles.
a is fixed by welding.

The details of the wedge portions 16 and 17 will be described.
As shown in FIG. 6, which is a sectional view taken along the line AA in FIG. 4 and in which the main portions of FIGS. 5 and 4 are enlarged in width and shortened in height, the wedge portion 16 on the inner surface of the embedded square steel pipe 13 is Wedge plate 16a having a width close to the width of one side of embedded square steel pipe 13
Are welded and fixed via three tapered ribs 16b, and the wedge portion 17 on the outer surface of the square steel pipe 15 for piles is formed by welding and fixing taper ribs at two locations. The surface on which the wedge portions 16 and 17 are provided may be in any of the upstream and downstream sides of the square steel pipes 13 and 15 or a direction perpendicular to the flow. Also, the wedge portions 16 and 17 are connected to the square steel pipes 13 and 15
Not only one surface but also a plurality of surfaces such as two orthogonal surfaces may be provided. In addition, the wedge part 1 provided in the square steel pipes 13 and 15
Each of the members 6, 17 is not limited to the structure of the embodiment, and may have a shape in which they are in contact with each other on a slope and perform a wedge action.

When constructing the driftwood preventing fence 10 described above, the embedded square steel pipe 13 to which the base plate 13a and the wedge portion 16 on the inner surface are welded and fixed is embedded in the concrete foundation 12 at intervals. After hardening concrete, square steel pipe for pile 1
When the hook for lifting the work machine is hooked on the hook hooking portion 15a at the upper end of 5 and the square steel pipe 15 for the pile body is lifted up and inserted into the embedded square steel pipe 13 in the correct orientation, the square steel pipe 15 for the pile body The wedge action between the wedge part 16 of the pile and the wedge part 17 on the inner surface of the embedded square steel pipe 13 causes the square steel pipe 15
Is fixed in the embedded square steel pipe 13 so as not to rattle. Next, when the pin 18 is penetrated through the square steel pipes 13 and 15, the square steel pipe 15 for pile body is prevented from coming off, and the installation of the fence constituent piece 11 is completed. When the square steel pipe 13 for piles is similarly inserted into the other embedded square steel pipes 13, the construction of the driftwood preventing fence 10 is completed.

As described above, the square steel pipe 1 for a pile
In the driftwood prevention fence 10 in which the 5 are lined, the interval is set to a distance appropriately determined by various experiments and the like, so that the driftwood that flows can be almost certainly captured, and the driftwood flows downstream. Damage can be prevented from occurring.

When the debris flow rushes against the driftwood prevention fence 10 and the like, the pile steel pipe 15 for the pile body is broken, the pin 18 is pulled out, the square steel pipe 15 for the pile body is pulled out from the embedded square steel pipe 13, and the pile steel pipe 15 is removed. The square steel pipe 15 is inserted into the embedded square steel pipe 13. In this case, since the embedded square steel pipe 13 embedded in the concrete foundation 12 is hardly damaged, it is sufficient to replace only the replaceable square steel pipe 15 for piles, and the replacement work is simple and the cost is low. I'm done.

The detachable pile-shaped fences may have a lower strength than the conventional A-shaped fences 1 or lattice-shaped fences. Square steel pipe 15
Debris flow is rare enough to damage
At that time, the idea of replacement was adopted, and there was no hindrance to the work as a driftwood prevention fence.
In addition, the overall cost of construction of the driftwood prevention fence and maintenance costs, including repairs in case of damage, can be reduced.

In the above-described embodiment, the wedge portions 16 and 17 are fixed to the embedded square steel pipe 13 and the pile steel pipe 15, respectively.
A separate wedge member is prepared without providing a wedge portion at the bottom, and this wedge member is driven into the gap between the embedded square steel pipe 13 and the square steel pipe 15 for the pile body, and the square steel pipe 15 for the pile body is embedded into the embedded square steel pipe. 13
It is also possible to fix to.

Further, in the above embodiment, the pile body is fixed in the cylindrical hole by the wedge action, but the fixing means is not limited to the one utilizing the wedge action. Only the pin 18 in the above-described embodiment may be used for fixing, or various other fixing means may be employed.

In the above-described embodiment, the cylindrical hole and the pile body are provided vertically. However, as shown in FIG. 7, the square steel pipe 13 'forming the cylindrical hole and the square steel pipe 15 'May be provided to be inclined upward (rightward in FIG. 7) with respect to the flow direction (arrow direction) of the river. According to this configuration, when the driftwood 20 flows, the driftwood is fastened to the driftwood that is first fastened to the driftwood prevention fence, so that the subsequent driftwood is below the previous driftwood ( The driftwood will be pushed down to the bottom, preventing driftwood from climbing over the driftwood prevention fence.

In the above embodiment, a square steel pipe is used as the steel pipe forming the cylindrical hole and the steel pipe for the pile body, but a round steel pipe may be used.

Further, in the above embodiment, a steel pipe is used as a pile, but a concrete pile can be used. Also in this case, either a structure in which a wedge portion is formed on each of the pile body side and the cylindrical hole or a structure in which a separate wedge member is driven may be used. In addition, concrete foundation 1
The cylindrical hole formed on the two sides is not limited to the case where the cylindrical hole is formed by a steel pipe as in the embodiment, but the cylindrical hole may be formed by another cylindrical material. A cylindrical hole may be formed in the hole.

[0023]

According to the present invention, the lower portion of the pile is detachably inserted into a plurality of cylindrical holes provided on the driftwood prevention fence foundation at intervals in the width direction of the river. If the damage is later caused by debris flow, it can be repaired simply by replacing the pile, making the repair work extremely simple and reducing the cost of repair.

According to the third aspect of the present invention, when the cylindrical hole and the pile body are provided so as to be inclined in the upstream direction with respect to the flow direction of the river, the driftwood that has flowed and stayed at the driftwood prevention fence is removed later. Since the driftwood that has flowed down is pushed down, it can be effectively prevented that the driftwood gets over the driftwood prevention fence.

According to the fourth or fifth aspect, if the pile is fixed to the cylindrical hole using the wedge action, the pile can be easily fixed. In particular, when wedge portions are formed in the cylindrical hole and the pile body, respectively, it is not necessary to handle a separate wedge member, and the operator simply inserts the pile body into the cylindrical hole. Construction is easy.

In the case where a steel pipe is used as in claim 6,
Since no separate formwork is needed to form the cylindrical hole,
It is easy to form a cylindrical hole, and a cylindrical hole having a certain diameter can be obtained.

According to the seventh aspect, since the square steel pipe is used as the steel pipe and the wedge part is formed by the plate-shaped wedge part and the tapered rib-shaped wedge part, a wedge part which performs a smooth wedge action can be obtained.

[Brief description of the drawings]

FIG. 1 is a front view of a driftwood prevention fence according to an embodiment of the present invention.

FIG. 2 is an enlarged view of one fence component in FIG. 1;

3A is a right side view of FIG. 2, and FIG. 3B is a plan view of FIG.

FIG. 4 is a partially cutaway enlarged view of a main part in FIG. 3;

FIG. 5 is an enlarged sectional view taken along line AA in FIG. 4;

FIG. 6 is an enlarged view showing a main part of FIG. 4 with a reduced height dimension.

FIG. 7 is a cross-sectional view of one fence component piece in a driftwood prevention fence according to another embodiment of the present invention.

FIG. 8 is a front view of a conventional driftwood prevention fence.

9 is an enlarged cross-sectional view taken along the line CC in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Driftwood prevention fence 11 Fence constituent piece 12 Concrete foundation 13 Embedded square steel pipe (cylindrical hole) 15 Square steel pipe for pile body (pile body) 15a Hook hook part 16 Wedge part (cylindrical hole side wedge part) 16a Wedge plate 16b Tapered rib 17 Wedge part (pile side wedge part) 18 pin

Claims (8)

[Claims] 1. A driftwood prevention fence having a lower part of a pile body removably inserted into a plurality of cylindrical holes provided on a driftwood prevention fence foundation at intervals in the width direction of a river. 2. The driftwood prevention fence according to claim 1, wherein the cylindrical hole and the pile body are provided vertically. 3. The driftwood prevention fence according to claim 1, wherein the cylindrical hole and the pile body are provided so as to be inclined upward in the river with respect to the flow direction of the river. 4. A lower portion of a pile body is removably inserted into a cylindrical hole provided at an interval in a driftwood prevention fence foundation, and a gap between an inner surface of the cylindrical hole and an outer surface of the pile body is provided. A driftwood prevention fence, wherein the pile body is fixed to a cylindrical hole by driving a wedge member. 5. A lower portion of a pile body is detachably inserted into a cylindrical hole provided at an interval on a driftwood prevention fence foundation, and slopes formed on an inner surface of the cylindrical hole and an outer surface of the pile body, respectively. A driftwood prevention fence, wherein the pile body is fixed to a cylindrical hole by a wedge action between wedge portions that come into contact with each other. 6. The steel pipe according to claim 1, wherein said tubular hole is formed by embedding a steel pipe in a driftwood prevention fence foundation, and a steel pipe having a diameter smaller than the inner diameter of said steel pipe is used as said pile body. , 4 or 5 driftwood prevention fence. 7. A square steel pipe is used as both a steel pipe forming the cylindrical hole and a steel pipe for a pile body, and a wide plate-shaped wedge portion is formed on the inner surface of the square steel pipe of the cylindrical hole. The driftwood prevention fence according to claim 6, wherein a tapered rib-shaped wedge portion is formed on an outer surface of the square steel pipe as a body. 8. The lifting device according to claim 1, wherein a hook hook for lifting is attached to an upper end of the pile.
The driftwood prevention fence according to 4, 5, 6, or 7.