JPS5940966B2 - Steel slit erosion control dam - Google Patents

Description

[Detailed Description of the Invention] The present invention aims to prevent instability of the structure and a decrease in the slit effect due to the expansion of the scale of a steel slit sabo dam that traps debris flows and has a certain sand storage function. This relates to a steel slit erosion control dam with a joint beam installed above the structure.

The scale of conventional steel slit erosion control dams is usually within a range of about 3 to 4 meters, with the height of the dam being the height of the tip of the debris flow.

However, there are problems: 1) Debris flows may occur continuously or several times in one season.

2) If boulders are involved, the boulders will be trapped in the slits between the structures of the steel slit erosion control dam, and the slits will be in a closed state, and the subsequent mudflow will also be impounded by this influence.

Therefore, on a conventional scale, it has been difficult to adequately respond to situations 1) and 2) above.

Increasing the height of the structure in order to expand the scale poses problems in terms of structural stability.

The present invention has been made to eliminate the above-mentioned drawbacks of the prior art.

The present invention necessarily requires a structure (
The height of the steel main column AIC restraining material 8 (connected) is 4 to 15.
It is necessary to expand the range to m.

However, if the main pillar A of the structure is made higher, the slit interval λ(
Lambda) becomes difficult to hold, and although the upper slit of main pillar A is enlarged by the boulders, the slits next to it become narrower, causing the boulders to flow out and debris flows smaller than the boulders to no longer flow. The invention is for prevention, and the composition of the invention is as follows.

(1) A plurality of structures consisting of steel main pillars and steel plugs are fixed to the river bed parallel to the flow direction of the river with intervals between each structure to prevent only boulders, and A steel slit erosion control dam characterized by connecting the upper parts of each structure with joint beams.

(2) A plurality of structures made of eight steel members joined to a steel main column are fixed to the riverbed parallel to the river flow direction at intervals that only block boulders at intervals between each structure, and A steel slit erosion control dam characterized by connecting the upper parts of each structure with joint beams, and fixing both ends of the joint beams to battlements on both banks of the river.

(3) A plurality of structures consisting of eight steel members joined to a steel main pillar are fixed to the river bed parallel to the flow direction of the river with intervals between each structure to prevent only boulders, and It is a steel slit erosion control da h0 characterized by connecting the upper parts of each structure with joint beams and installing diagonal members in the structure near both banks of the river in a direction almost perpendicular to the flow direction of the river. .

The structure of a conventional steel slit erosion control dam is as shown in the side views shown in Figs. 1 and 4, and in contrast to this conventional structure 1,
As shown in the plan view of the entire steel slit erosion control dam shown in Figure 2, the trajectory direction a of the debris flow is perpendicular to the dam structure 1, or at an angle α, where the debris flow is parallel as shown in Figure 5. In the case of a collision in the direction P2, the structure 1 exhibits a stable function, but in the case of a collision in the diagonal direction P at an angle α with respect to the structure 1, the structure 1 exhibits a load force in the direction of the interval λ (lambda). Due to the action of P1, the structure 1 cannot maintain a predetermined spacing, and it is difficult to increase the height of the structure 1. There must be.

Therefore, due to the problems 1) and 2), it is required to increase the size of the structure 1.

However, when the conventional structure 1 shown in Figs. 1 and 4 is enlarged, the load component P1 shown in Fig. 5 acts, so it must be supported as a cantilever. is structure 1
However, the maximum bending stress occurs at the lower fixed position, so the cross section of the main column A is enlarged, resulting in an overall uneconomical structure without losing the original effect of the steel slit erosion control dam.

As shown in FIGS. 6 to 9, the present invention solves the above-mentioned conventional deficiencies by constructing a plurality of structures 1 in which eight steel members are connected to a steel main column at intervals that only prevent boulders. A joint beam whose lower part is fixed to the river bed parallel to the flow direction of the river, and a joint beam 2 is provided at the top or slightly below the top of each structure 1 to connect each structure's body 1 upward. 2, the slit spacing of each structure 1 can be maintained, and the bending moment, which is an element that determines the structural cross section, can be reduced to approximately one-fourth at the lower fixed position. A steel slit sabo dam with a stable and economical cross section can be obtained without losing a certain slit effect.

In the present invention, the joint beam 2 connecting each structure 1 is the seventh
It is also possible to provide the joint beams 2 at a plurality of locations in the upper part of the drawing, and the vertical interval between the connecting beams 2 is preferably about 3 to 6 m, so that the slit effect does not deteriorate.

In addition, as shown in Figure 6 or Figure 9, the joint beam 2 is supported by materials such as steel pipes, shaped steel, and steel bars against both tensile and compressive forces, and is supported only by tensile force. In this case, the tie rod method shown in FIG. 9 is used.

The above-mentioned joint beams are attached to the structure 1 in advance, and at the time of on-site assembly for construction of a river dam, the joint beams protruding from each other are welded, riveted, bolted, etc. using an appropriate connection force method approximately at the center of the slit. are connected at the connection part 9.

In addition, when connecting each structure 1 using the tie rod method, the ninth
As shown in FIGS. 1 and 10, the tie rod 3 connected to the tie rod mounting bracket 5Vc attached to the structure 1 is stretched by a tongue buckle 4 at approximately the center of the slit, and each structure 1
The slit interval λ (lambda) is maintained at a specified interval.

The first specific invention, as shown in Fig. 8, connects the structure 1 with a joint beam 2, and the lower end is fixed to the river bed, and the second invention, as shown in Fig. The joint beams 2 at both ends are fixed to the concrete battlements 8 provided on both banks by an appropriate fixing method.

As an example of the fixing force method, as shown in FIG. 11, an anchor 6 is buried inside the concrete of the parapet 8, and the end of the tie rod 3 is fixed to the anchor 6Vc.

In addition, in the case of a joint beam 2 made of materials such as steel pipes, shaped steel, steel bars, etc., the ends of the joint beam 2 are welded to the plate 10 provided on the anchor 7 buried inside the concrete of the parapet 8, as shown in Fig. 12. They are connected using appropriate fixing means such as rivets, bolts and nuts.

The third invention is a structure 1 near both banks as shown in Fig. 13.
The diagonal members 11 and 12 are provided in a figure-eight shape in a direction substantially perpendicular to the flow direction of the river, or the diagonal members 11 are provided in the structure 1 near both banks as shown in FIG. In this invention, the structure 1 can be firmly supported by being fixed to the river bed without fixing both ends of the joint beam 2 to the battlements 8 as in the second invention of Ilma, and the upper part of each structure 1 can be jointed. The beam 2 can maintain sufficient slit spacing.

In addition. When diagonal members 11, 12 or diagonal members 11 are provided in the structure 1, the strength of the present invention increases even if both ends of the upper joint beam 2 are connected and fixed to the parapet 8. It is also within the technical scope to fix it to .

The present invention handles the reaction force generated from the joint beam 2 connecting a plurality of structures as a reaction force by using the concrete and diagonal members 11 and 12 of the parapet 8, and also uses the steel structure 1 itself. By supporting it as a cantilever structure, it is possible to support a structure reinforced by adding outer diameter, wall thickness, or material strength, and as shown in FIG. 8, any one or more of the structures 1 It is possible to target books.

In the above-mentioned first and second inventions, the spacing between each structure is maintained by connecting beams, and one or more connecting beams are provided above the structures, and the connecting beams are arranged in one or more steps above the structures to prevent soil and stones from collapsing. Since the spacing is maintained to prevent only the mixed boulders, the purpose of the dam is fully achieved and the sabo dam exhibits an erosion control effect, and an enlarged sabo dam can be easily constructed on-site, and the deficiencies of the conventional dam can be fully resolved. There are other effects.

[Brief explanation of the drawing]

Fig. 1 is a side view of the A-type structure, Fig. 2 is a plan view of the conventional sabo 2hiro, Fig. 3 is a plan view of the conventional structures arranged side by side, and Fig. 4 is a side view of the humanoid structure. , Fig. 5 is an explanatory diagram of the action of a debris flow, Figs. 6 and 7 are front views of a part of the present invention, Fig. 8 is a front view of the present invention, Fig. 9 is a front view of the tie rod force type, and Fig. 10 The figure is a front view of the same fixing part as above, FIG. 11 is a front view of the joint beam fixed to the parapet, and FIGS. 12, 13, and 14 are front views of the diagonal member. A is the earth pillar, B is the frame material, 1 is the structure, 2 is the joint beam, 3 is the tie rod, 4 is the tongue buckle, 5 &! (Lot installation money included) 6 is the anchor, 7 is the anchor, 8 is the parapet, 9 is the connection part, 10 is the plate, 11° 12 is the diagonal member.

Claims (1)

[Claims] 1. A plurality of structures in which steel plugs are connected to steel main pillars are installed on the riverbed parallel to the flowing direction of the river, with intervals between each structure to prevent only boulders. A steel slit erosion control dam that is fixed and connected at the top of each structure with joint beams. 2. A plurality of structures consisting of steel main pillars and steel plugs are fixed to the river bed parallel to the flow direction of the river, with intervals between each structure to prevent only boulders, and each structure A steel slit erosion control dam characterized by connecting the upper part of the body with joint beams, and fixing both ends of the joint beams to battlements on both banks of the river. 3. A plurality of structures consisting of steel main columns and steel plugs are fixed to the riverbed parallel to the flow direction of the river with intervals between each structure to prevent only boulders, and each structure A steel slit erosion control dam, which is characterized by connecting the upper part of the body with joint beams and installing diagonal members in the structure near both banks of the river in a direction almost perpendicular to the flow direction of the river.