JP2022182213A - Cofferdam construction - Google Patents

Abstract

To provide a cofferdam construction in which the falling and flowing-out of sandbags hardly occur even when a water level rises.SOLUTION: A cofferdam construction in claim 1 is constituted by fixing a pair of facing panels using a strut to form a box frame and fixing the plurality of box frames using a connection member. In a cofferdam construction in claim 2, the box frame is constituted by attaching the struts between vertical beams provided at both side faces of the pair of facing panels in the invention of the claim 1. In a cofferdam construction in claim 3, the box frame is constituted by attaching the struts between slide rails provided at both side faces of the pair of facing panels in the invention of the claim 1.SELECTED DRAWING: Figure 1

Description

The present invention relates to so-called temporary cofferdam construction, in which water is coffered with a temporary embankment or the like in order to construct a structure underwater or at the water's edge under the same conditions as on land.

When constructing a structure in water or at the water's edge, such as river bank protection work, it is often the case that the necessary part of the construction is temporarily drained to dry work before construction is carried out. A temporary cofferdam construction method is known as this method.

When excavating a levee for construction work, a temporary coffering construction method called the steel sheet pile double construction method is adopted. A temporary embankment is constructed by connecting the steel sheet piles with tie rods after the steel sheet piles are doubled (in parallel).

In the case of construction work that does not require excavation of the embankment, an embankment method is used to build a temporary embankment by using large sandbags or building an earthen embankment, or a single sheet of steel sheet piles is driven in and the sheet piles are supported by embankments. and a temporary embankment will be adopted. Alternatively, a box frame may be formed by fixing opposing panels with struts, and a temporary embankment may be formed by filling the box frame with sandbags or the like.

In Patent Document 1, a plurality of main piles are driven at predetermined intervals, a waling material is laid around the outer periphery of the main piles, and a steel sheet pile is driven on the outer side of the waling. A temporary cofferdam construction method is disclosed.

Japanese Patent Application Laid-Open No. 2003-206539

In the cofferdam construction method using the above-mentioned large-sized sandbags, the large-sized sandbags are often overturned and washed away when the water level rises, and the impact on the construction site and its hinterland often poses a problem. Normally, large sandbags are piled up with cloth to ensure the stability of the structure by their own weight. easy to become This also applies to temporary embankments in which the box frame is stuffed with sandbags or the like.

SUMMARY OF THE INVENTION Accordingly, it is an object of the present invention to provide a temporary cofferdam that is less likely to overturn or be washed away even when the water level is high.

The configuration of the present invention for achieving the above object is as follows.

(1) The temporary cofferdam described in claim 1 is configured by fixing opposing panels with struts to form a box frame, and fixing a plurality of box frames with connecting members.

(2) In the temporary cofferdam described in claim 2, in the invention described in claim 1, the box frame is constructed by attaching struts between vertical beams provided on both side surfaces of a pair of facing panels.

(3) The temporary cofferdam described in claim 3 is the invention described in claim 1, wherein the box frame is configured by attaching struts between a pair of opposing slide rails provided on both sides of the panel. did.

How the present invention configured as described above works to solve the problems will be outlined with reference to the drawings. In each figure, F means forward, B means rearward, R means rightward, and L means leftward.

As shown in FIG. 4, a temporary cofferdam 10 according to the present invention is constructed by fixing a box frame 11 with a connecting member 12 .

The above-mentioned conventional example of a temporary embankment formed by fixing opposing panels with struts to form a box frame, and filling the box frame with sandbags, etc. It is composed of only one row of a plurality of box frames 11 in the direction. With such a structure, there is a risk of overturning due to the water pressure when the water level rises as described above.

However, in the case of the temporary coffering work 10 according to the present invention, the box frames 11 in the foremost left-right direction containing the sandbags 50 are fixed at the rear by a plurality of box frames 11 and connecting members 12, respectively. Therefore, by supporting each other between the box frames 11, it is possible to suppress the overturning and outflow due to the water pressure as much as possible even when the water level is high.

In addition, in the case of the box frame 11 that does not contain the sandbag 50, the fact that water can flow inside the box frame 11 also contributes to suppressing overturning and outflow.

Furthermore, if a lining board is placed on the upper part of the box frame 11, there is also an advantage that work can be performed on the lining board.

Perspective view of temporary cofferdam according to the present invention A perspective view of the box frame according to claim 2 A perspective view of the box frame according to claim 3 Explanatory diagram showing the implementation state of the present invention Perspective view of connecting member

Preferred embodiments of the invention are outlined below with reference to the drawings. It should be noted that the embodiments of the constituent elements of the present invention are not limited to the following embodiments, and can take various forms as long as they fall within the technical scope of the present invention.

As shown in FIG. 1 , the temporary cofferdam 10 according to claim 1 is constructed by fixing a plurality of box frames 11 with a plurality of connecting members 12 . Specifically, the box frames 11 adjacent to each other in the front-rear direction are fixed by connecting members 12 . Although the box frames 11 aligned in the left-right direction in the figure are not fixed to each other, the present invention does not exclude a mode in which the box frames lined up in the left-right direction are fixed by connecting members.

The box frame 11 is formed by fixing a pair of opposing panels 13 with one or more struts 14 .

The panel 13 is made of a rectangular steel material having a required size and having a strength corresponding to a required water pressure or a required earth pressure. A strut 14 has a jack structure around the panel 13 , and both ends of the strut 14 are fixed to the vertical support members 15 of the panel 13 .

Both proximal ends of the struts 14 are provided with detachable support structures for the panels 13 . A well-known structure is adopted as this detachable support structure. For example, although not shown, a bracket for mounting is provided at a predetermined position of the vertical support member 15, and the proximal end of the strut 14 is fitted to this bracket for mounting so that it can be detachably fixed with a pin or the like. Structured. Of course, it is not limited to this.

The connecting member 12 is substantially U-shaped as shown in FIG. 5 and is a steel material having a required strength. Of course, this is just an example, and any shape can be adopted as long as the box frames 11 can be connected and fixed to each other.

In the second aspect of the invention, as shown in FIG. 2, the box frame 20 is constructed by attaching struts 14 between vertical beams 21 provided on both side surfaces of a pair of panels 13 facing each other.

The vertical beam 21 is a rectangular column made of steel, and is provided with a concave receiving portion corresponding to the convex inserting portion provided on the panel 13 . The panel 13 is fixed to the vertical beam 21 by fitting the insertion portion into the receiving portion.

Of course, the above structure of the vertical beams is an example, and vertical grooves may be provided in the longitudinal direction of the vertical beams 21 and the panels 13 may be fitted into the vertical grooves, or the vertical beams 21 may be formed into elongated members having a U-shaped cross section. , and the panel 13 may be fitted inside.

In the third aspect of the invention, as shown in FIG. 3, the box frame 30 is constructed by attaching struts 14 between a pair of facing slide rails 31 provided on both sides of the panel 13 .

The slide rail 31 is formed to have a required length by combining structural materials, and guide grooves 32, 32 are formed along the axis on both sides in the front-rear direction during use. In the embodiment shown in FIG. 3, lipped channel steel is superimposed on the web surface side to form an integral shape, and the inner side thereof is formed to serve as the guide groove 32 . The slide rail 31 is not limited to this embodiment, and is provided with a guide groove that can obtain the required cross-sectional strength by using other members and that can hold the edge of the panel 13 by fitting it. Anything is fine.

10 Temporary cofferdam 11 Box frame 12 Connecting member 13 Panel 14 Strut 20 Box frame 21 Vertical beam 30 Box frame 31 Slide rail 32 Guide groove

The connecting member 12 is substantially U-shaped as shown in FIG. 5 and is a steel material having a required strength.

Claims (3)

Forming a box frame by fixing opposing panels with struts;
Fixing a plurality of box frames with connecting members,
A temporary cofferdam characterized by A temporary cofferdam according to claim 1, wherein the box frame is constructed by attaching struts between a pair of facing longitudinal beams provided on both sides of the panel. A temporary cofferdam according to claim 1, wherein a strut is attached between a pair of slide rails provided on both sides of the panel facing each other.

Images