JP7413158B2 - shoring structure - Google Patents

Description

The present invention relates to a shoring structure for an earth retaining wall.

BACKGROUND ART As a method for constructing a structure on the ground below a road or the like, there is an open-cut method in which the ground is excavated from the ground surface and a structure is constructed in the excavated portion. During construction, a lining plate will be placed above the excavation area as necessary to ensure road traffic.

In the open-cut method, earth retaining walls are installed on both sides of the planned excavation location, and the ground is excavated between the earth retaining walls. At this time, by providing struts or the like as shoring between the earth retaining walls, the earth retaining walls are supported against lateral pressure from the ground behind the earth retaining walls (see, for example, Patent Document 1).

Patent No. 3942152

However, in the conventional shoring structure as described above, the number of struts may increase, resulting in problems such as a decrease in workability and an increase in cost. In addition, the work space for underground construction becomes narrower.

The present invention has been made in view of the above problems, and its purpose is to provide a shoring structure that is excellent in terms of workability and cost.

To achieve the above-mentioned object, the present invention provides a shoring structure for an earth retaining wall used when excavating the ground between earth retaining walls, which includes a lining plate placed above an excavated part of the ground. In order to receive the earth retaining wall, a support girder is installed between the earth retaining walls, a reaction force receiving member is fixed to the lower surface of the earth retaining wall, and a bracket is fixed to the inner surface of the earth retaining wall. an upright provided on the inner surface; a transmission section provided on the side of the reaction force receiving member and transmitting the lateral pressure of the ground acting on the earth retaining wall from the upright to the reaction force receiving member; The reaction force receiving member has a plurality of plate members in the width direction of the support girder, each plate member being arranged perpendicularly to the lower surface of the support girder along the extending direction of the support girder. This shoring structure is characterized in that the upper side is directly welded to the lower surface of the support girder.

In the present invention, the lateral pressure of the ground acting on the earth retaining wall can be transmitted to the reaction force receiving member, transmitted to the receiving girder of the lining board via the reaction force receiving member, and resisted by the receiving girder. This allows the support girder to function as a strut, reducing the amount of struts provided between the earth retaining walls, improving workability and cost, and ensuring a wide working space within the excavation area.

The reaction force receiving member of the present invention has a plurality of plate materials arranged in the width direction of the support girder, which are arranged perpendicularly to the lower surface of the support girder along the extending direction of the support girder, and the upper side of each plate material. is welded to the lower surface of the support girder . For example, the plate material has a trapezoidal shape with vertical sides, a lower side is shorter than an upper side, and the side sides are fixed to a connecting plate for connecting the reaction force receiving member to the transmitting part.
The reaction force receiving member has multiple plates in the width direction of the receiving girder, and by welding these plate materials to the receiving girder and fixing the reaction force receiving member to the receiving girder, the lateral pressure acting on the earth retaining wall can be reduced. The welding length necessary to transmit the signal to the support girder can be secured using multiple plates, and the welding range of the support girder can be reduced. Therefore, the length of the reusable portion of the support girder is increased, and the material of the support girder can be used effectively. Further, by forming the plate material into the trapezoidal shape described above, the reaction force receiving member can be formed into the necessary minimum rational shape.

It is preferable that a jack is used as the transmission section.
By adjusting the expansion and contraction of the jack, the lateral pressure of the ground acting on the earth retaining wall can be suitably transmitted to the reaction force receiving member.

According to the present invention, it is possible to provide a shoring structure that is excellent in terms of workability and cost.

A diagram showing a shoring structure 1. FIG. 2 is a diagram showing range A in FIG. 1; FIG. 5 is a diagram showing a reaction force receiving member 5. FIG. The figure which shows the shoring structure 1a.

Hereinafter, preferred embodiments of the present invention will be described in detail based on the drawings.

FIG. 1 is a diagram showing a shoring structure 1 according to an embodiment of the present invention. Further, FIG. 2 is a diagram showing range A in FIG.

As shown in FIG. 1, in this embodiment, a pair of earth retaining walls 2 are formed in the ground 11, and the excavated portion 12 is formed by excavating the ground 11 between the earth retaining walls 2. Further, a lining plate 13 is arranged above the excavation part 12 for the passage of vehicles and the like.

The earth retaining wall 2 is, for example, a soil cement wall made of H-shaped steel and soil cement, but the earth retaining wall 2 is not particularly limited.

A rib 3 is provided on the inner surface of the earth retaining wall 2 along the extending direction of the earth retaining wall 2 (corresponding to the direction normal to the plane of the paper in FIGS. 1 and 2). For example, H-beam steel is used for the riser 3. The lining 3 is installed on a bracket 9 fixed to the earth retaining wall 2, and a backing material 31 is arranged between the lining 3 and the earth retaining wall 2.

During ground excavation, earth pressure and water pressure act on the retaining wall 2 from the ground 11 behind it. In order to prevent deformation of the earth retaining wall 2 due to these lateral pressures, a shoring structure 1 is formed near the upper end of the earth retaining wall 2 in this embodiment.

The shoring structure 1 includes a receiving girder 4, a reaction force receiving member 5, a jack 6, and the like.

The support girder 4 is a girder material that receives the lining plate 13, and is spanned between the tops of the earth retaining walls 2. In this embodiment, H-beam steel is used for the support girder 4, but the invention is not limited to this. Further, behind the earth retaining wall 2, girder support members 10 and the like for supporting the support girders 4 are also installed.

The reaction force receiving member 5 is fixed to the flange 41 on the lower surface of the receiving girder 4 by welding. The reaction force receiving member 5 is fixed to the receiving girder 4 in advance before the receiving girder 4 is installed.

The jack 6 is disposed on the side of the reaction force receiving member 5 and has a function as a transmission section that transmits the lateral pressure acting on the earth retaining wall 2 to the reaction force receiving member 5. One end of the jack 6 is connected to the connecting piece 7 in advance. The jack 6 is installed by connecting the other end of the jack 6 to the reaction force receiving member 5 and arranging the filler 8 between the riser 3 and the connecting piece 7.

FIG. 3 is a diagram showing the reaction force receiving member 5. As shown in FIG. As shown in FIG. 3, the reaction force receiving member 5 has a flange plate 51 and a web plate 52.

The flange plate 51 is a rectangular connecting plate for connecting the reaction force receiving member 5 to the jack 6, and extends along the width direction of the receiving girder 4 (corresponding to the depth direction in FIG. 3). It is arranged perpendicularly to the flange 41. The upper side of the flange plate 51 is fixed to the flange 41 on the lower surface of the support girder 4 by welding. The jack 6 and the flange plate 51 are connected using bolts and nuts, and the flange plate 51 is also provided with holes (not shown) for passing the bolts.

The web plate 52 is a trapezoidal plate material, and one side extending in the vertical direction is fixed to the flange plate 51 by welding or the like. The other side slopes away from the flange plate 51 as it goes upward.

The web plate 52 is arranged along the extending direction of the support beam 4 (corresponding to the left-right direction in FIG. 3) and perpendicular to the flange 41 of the support beam 4. A plurality of web plates 52 are provided at intervals in the width direction of the support girder 4. In the example of FIG. 3, three web plates 52 are provided, but the number of web plates 52 is not particularly limited as long as it is two or more.

The lower side of each web plate 52 is shorter than the upper side, and the upper side of each web plate 52 is welded to the lower surface of the flange 41. Regarding welding, for example, fillet welding is performed on the upper side of the web plate 52.

In the shoring structure 1, the lateral pressure from the ground 11 acting on both retaining walls 2 is transmitted from the upright 3 to the reaction force receiving member 5 via the jack 6, and the reaction force receiving member 5 is transferred to the receiving girder 4. The shear force in the welding range d (see FIGS. 1 and 2) is transmitted to the support girder 4 and resisted by the support girder 4. Thereby, the support girder 4 functions as the uppermost strut that prevents the earth retaining wall 2 from deforming.

Other struts are also installed at the bottom of the retaining walls 2, but by using the support girders 4 as struts as in this embodiment, some of the struts between the retaining walls 2 can be omitted. It becomes possible to widen the spacing between the struts, which is superior in terms of workability and cost, and allows a wide working space to be secured in the excavation section 12. Furthermore, by using the jack 6 as a transmission section that transmits the lateral pressure acting on the earth retaining wall 2 to the reaction force receiving member 5, the lateral pressure can be suitably transmitted by adjusting the expansion and contraction of the jack 6.

However, the present invention is not limited to the above embodiments. For example, the structure of the transmission part that transmits the lateral pressure acting on the earth retaining wall 2 to the reaction force receiving member 5 is not particularly limited as long as it can transmit the lateral pressure.

Further, the configuration of the reaction force receiving member 5 is not particularly limited, as long as it can transmit the side pressure acting on the earth retaining wall 2 to the receiving girder 4. For example, as shown in the reaction force receiving member 5a of the shoring structure 1a in FIG. 4, an H-shaped steel 52a may be provided on the end plate 51a.

The end plate 51a is a connecting plate for connecting the reaction force receiving member 5a to the jack 6, and has substantially the same configuration as the flange plate 51 described above.

The H-shaped steel 52a is arranged so that its axial direction extends along the extending direction of the support girder 4. One axial end of the H-beam 52a is fixed to the end plate 51a, and the flange 53 on the upper surface of the H-beam 52a is welded and fixed to the flange 41 on the lower surface of the support girder 4. In the example shown in FIG. 4, the connecting piece 7 and the filler 8 are omitted, and the end of the jack 6 opposite to the reaction force receiving member 5a is directly connected to the riser 3.

This also allows the lateral pressure acting on the earth retaining wall 2 to be transmitted to the support girder 4 so that the support girder 4 can function as the uppermost strut. However, in this case, it is necessary to ensure the welding length of the reaction force receiving member 5a necessary for transmitting the lateral pressure acting on the earth retaining wall 2 to the receiving girder 4 with one H-beam 52a, and the welding range d becomes longer.

In this respect, as shown in FIG. 3, the reaction force receiving member 5 can secure the necessary welding length with a plurality of web plates 52, shorten the welding length per web plate 52, and reduce the welding range d. is better, the length of the reusable part of the support girder 4 (the part inside the welding range d in FIG. 1) increases, and the material of the support girder 4 can be used effectively. In addition, by forming the web plate 52 into the trapezoidal shape described above, the reaction force receiving member 5 can be formed into the minimum necessary and rational shape.

Although preferred embodiments according to the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to such examples. It is clear that those skilled in the art can come up with various changes or modifications within the scope of the technical idea disclosed in this application, and these naturally fall within the technical scope of the present invention. Understood.

1, 1a: Shoring structure 2: Earth retaining wall 4: Support girders 5, 5a: Reaction force receiving member 6: Jack 11: Ground 12: Excavation section 13: Lining plates 41, 53: Flange 51: Flange plate 51a: End plate 52: Web plate 52a: H-beam steel

Claims (3)

A shoring structure for earth retaining walls used when excavating the ground between earth retaining walls,
In order to receive the lining plate placed above the excavated part of the ground, a support girder is installed between the earth retaining walls,
a reaction force receiving member fixed to the lower surface of the receiving girder;
an upright provided on the inner surface of the earth retaining wall on a bracket fixed to the inner surface of the earth retaining wall;
a transmission part that is provided on a side of the reaction force receiving member and transmits the lateral pressure of the ground acting on the earth retaining wall from the upright to the reaction force receiving member;
Equipped with
The reaction force receiving member has a plurality of plate members arranged in the width direction of the support girder, which are arranged perpendicularly to the lower surface of the support girder along the extending direction of the support girder,
A shoring structure characterized in that the upper side of each plate is directly welded to the lower surface of the support girder . The plate material has a trapezoidal shape with vertical sides, the lower side is shorter than the upper side,
The shoring structure according to claim 1 , wherein the side edge is fixed to a connecting plate for connecting the reaction force receiving member to the transmitting part. 3. The shoring structure according to claim 1 , wherein a jack is used as the transmission section.

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