JP2013199746A - Earth retaining wall - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an economical earth retaining wall having a structure with an optimal rigidity corresponding to water pressure and earth pressure, which can be constructed by combining steel sheet piles, combination steel sheet piles, and beam members, and of which material cost and construction cost are reduced.SOLUTION: An earth retaining wall 1 is constructed by steel sheet piles 3 and combination steel sheet piles 5 each of which is constituted by arranging a stiffening member 4 along the longitudinal direction of the steel sheet pile 3. The stiffening members 4 are installed at intervals each at least equal to or more than the width of the steel sheet pile, and a beam member 6 is disposed between the adjacent stiffening members 4 so as to come into contact with the steel sheet piles 3.

Description

The present invention relates to a retaining wall constructed when building a revetment, retaining wall or underground structure.

In general, when constructing an underground structure, a retaining wall is constructed so as to surround the structure at a position where the structure is to be installed, and the structure is constructed by discharging sediment in front of the retaining wall. Steel sheet piles and steel pipe sheet piles are widely used for the structure of the retaining wall used at that time.
Although earth pressure and water pressure act on the retaining wall, the magnitude of these pressures varies depending on the ground conditions and usage conditions. However, because the rigidity of steel sheet piles and the like is constant for each size, the rigidity of the retaining wall is sometimes greater than the earth pressure or water pressure, and as a result, the construction of the retaining wall may be uneconomical.

  Therefore, as in the invention described in Patent Document 1, the retaining wall is composed of a combined steel sheet pile in which the shape steel is added to the longitudinal direction of the steel sheet pile, and the flank (beam member) is installed in contact with the shape steel. A retaining wall has been proposed.

JP 2011-247050 A

According to the invention of Patent Document 1, a combination of a steel sheet pile and a shape steel can be set so as to have an appropriate rigidity according to the earth pressure and water pressure acting on the earth retaining wall, so an economical earth retaining wall is constructed. Is possible.

However, in the invention described in the above-mentioned Patent Document 1, since the flank (5) is not in contact with the steel sheet pile (2), the shape steel (3) is not installed for each steel sheet pile, and the span of the shape steel and the shape steel is increased. Then, the steel sheet pile (2) where the shape steel (3) is not installed has a large deformation mode in the lateral direction inside the continuous wall (1) due to earth pressure or water pressure, and the ground surface around the continuous wall (1) There is a risk that settlement will occur and the function of the wall structure for earth retaining and water stoppage cannot be maintained.

Therefore, the structure does not have an optimum rigidity according to earth pressure or water pressure acting on the retaining wall, and there is a problem that the selection width of the combined steel sheet pile is limited.

  The present invention solves the problems of the conventional retaining wall as described above. By combining a steel sheet pile, a combined steel sheet pile, and a beam member, a retaining wall having an optimum rigidity structure corresponding to earth pressure or water pressure is obtained. The purpose is to provide an economical retaining wall that can be constructed and reduces the material cost and construction cost of the retaining wall.

Invention of Claim 1 is the earth retaining wall constructed | assembled by the steel sheet pile and the combination steel sheet pile comprised by attaching a stiffening member to the longitudinal direction of a steel sheet pile, The said stiffening member is at least steel It is a earth retaining wall which is installed with an interval of one or more sheet piles, and a beam member is disposed between the stiffening member and the stiffening member so as to contact the steel sheet pile.

According to a second aspect of the present invention, the beam member is a retaining wall horizontally arranged and connected between steel sheet piles on which the stiffening member is not installed.

According to the retaining wall of the first aspect, since the retaining wall having an optimum rigidity structure according to the earth pressure and water pressure can be constructed, the material cost and the construction cost of the retaining wall can be reduced.
Further, unlike the conventional steel sheet pile wall structure, a combined steel sheet pile with a stiffening member arranged on the construction extension of the steel sheet pile is arranged.
In the case of a conventional spare work, it was necessary to use a vibro hammer method or the like in order to dispose the spare piles discretely, but in the present invention, a steel sheet pile was placed in advance, and the reaction force from the steel sheet pile It becomes possible to construct a steel pipe by the press fitting method. Further, it is not necessary to transmit the force acting on the laying work by the tie material, and a wall body that reduces the displacement while omitting the space on the back side can be constructed.
Since the beam member is disposed between the stiffening member and the stiffening member so as to contact the steel sheet pile, a structure with a reduced wall width can be obtained. Moreover, a beam member can be easily installed using a steel pipe.

According to the earth retaining wall according to claim 2, since the beam member is arranged so as not to contact the steel sheet pile on which the stiffening member is not installed, the beam member can be shortened and the material cost can be reduced. Thus, the construction is facilitated, and the generation of local stress at the contact point between the beam member and the stiffening member can be prevented.

The top view of Embodiment 1 of the retaining wall of the present invention Side view of Embodiment 1 of the retaining wall of the present invention The top view which shows the example of installation of the beam member of Embodiment 2 of the retaining wall of this invention The top view which shows the example of installation of the beam member of Embodiment 3 of the retaining wall of this invention

The retaining wall according to the first embodiment of the present invention will be described with reference to FIGS. 1 and 2.
The retaining wall 1 is constructed by a wall body 2 that is formed by pressing a plurality of hat-shaped steel sheet piles 3 continuously into the ground and having a substantially corrugated shape in which a peak 3b and a valley 3a of the steel sheet pile 3 are repeated. Yes. A combination steel sheet pile 5 in which a steel pipe pile 4 as a stiffening member is attached to the longitudinal direction of the steel sheet pile 3 is disposed in a valley portion 3a of a part of the steel sheet pile 3 of the wall body 2.

  The steel pipe piles 4 are discretely provided with a certain span S in a valley portion 3a of a steel sheet pile 3 which is a part of the continuously pressed steel sheet pile.

A beam member 6 made of H-section steel is disposed between the steel pipe piles 4 and 4 in order to suppress the lateral deformation of the wall body 2 on the steel sheet pile 3 on which the steel pipe pile 4 is not provided.
The beam member 6 is set to be shorter than the span S of the two steel pipe piles 4, 4 so as to be in a direction orthogonal to the steel pipe pile 4 (horizontal direction) and both ends thereof abut against the steel pipe pile 4. It is arranged.
Further, as shown in FIG. 2, the beam member 6 is required to have an arbitrary interval h1, h2,... Hn with respect to the excavation depth H according to the lateral deformation of the wall body 2. The number of steps can be entered.

According to the first embodiment configured as described above, the steel pipe pile 4 and the beam member 6 have sufficient strength against the earth pressure and water pressure applied from the outside of the retaining wall 1 (upper side in FIG. 1). While suppressing the deformation | transformation to the inner side of the body 2, the effect sufficient as a retaining wall can be exhibited.

Furthermore, since the beam member 6 can be easily installed using the steel pipe pile 4 and the lateral displacement of the steel sheet pile 3 toward the inside of the retaining wall 2 can be suppressed, the span S of the steel pipe pile 4 can be increased.
In addition, since the rigid retaining wall 1 with sufficient strength according to the earth pressure or water pressure acting can be freely constructed, the amount of steel materials can be optimized, and costs such as reduction of useless materials can be reduced, which is economical.

In the said Embodiment 1, although a hat-shaped steel sheet pile was used as the steel sheet pile 3, it is not limited to this, A U-shaped steel sheet pile, a Z-shaped steel sheet pile, etc. can also be used. However, the hat-shaped steel sheet pile has superior workability compared to U-shaped steel sheet piles and Z-shaped steel sheet piles, and can reduce the construction cost and the construction period. In addition, the hat-shaped steel sheet pile does not cause longitudinal displacement at the joint, and the cross-sectional performance is efficient and clear. Since it becomes the smallest among various steel sheet piles such as steel sheet piles, the effect of facilitating the management of construction and ensuring of accuracy can be expected by making the wall body combining the steel pipe and the steel sheet pile more stable. For this reason, in order to construct a steel sheet pile wall, it is preferable to use a hat-shaped steel sheet pile.
Instead of the steel pipe pile 4, H-shaped steel, I-shaped steel or the like can be applied. However, if a steel pipe is used, it can be rotated and penetrated into the ground, and workability is improved.
The material used for the beam member 6 may be steel material such as H-shaped steel, concrete column material, wood, or the like. Further, the beam member 6 and the steel pipe pile 4 can be fixed by welding or bolting.

As a construction method of the combined steel sheet pile 5, the steel sheet pile 3 and the steel pipe pile 4 can be integrally joined in advance, but both may be joined after being separately placed in the ground. In the former construction, it is only necessary to use a vibro hammer, and in the latter case, construction using a pile press-fitting and drawing machine can be performed.
If construction is performed separately, a steel sheet pile can be placed in advance, a reaction force can be taken from the steel sheet pile, and a stiffening member can be press-fitted.

FIG. 3 is a plan view of Embodiment 2 of the present invention.
In the present embodiment, the beam member 6 is set to be shorter than the span S of the two steel pipe piles 4, 4, and in a direction (horizontal direction) orthogonal to the steel pipe pile 4, both ends thereof are the steel pipe pile 4. It arrange | positions so that it may not contact, It fixes to the surface of the steel sheet pile 3 inside the retaining wall 1, The both ends are not contacting the steel pipe piles 4 and 4, The effect | action similar to the said Embodiment 1, In addition to the effect, the amount of material used can be reduced, the construction is facilitated, and the generation of local stress generated from the contact point between the beam member 6 and the steel pipe pile 4 can be prevented.
The distance D between the steel pipe pile 4 and the end of the beam member 6 is preferably smaller than the width of one steel sheet pile in order to maintain the strength of the wall body 2 and prevent deformation.

FIG. 4 is a plan view of Embodiment 3 of the present invention.
In this embodiment, the beam member 6 is fixed to the outer surface of the steel sheet pile 3 in a state of being disposed between the steel pipe piles 4, 4, and both end portions thereof are not in contact with the steel pipe piles 4, 4. The same operations and effects as those of the second embodiment are achieved.

DESCRIPTION OF SYMBOLS 1 Earth retaining wall 2 Wall body 3 Steel sheet pile 4 Steel pipe pile (stiffening member)
5 Combination steel sheet pile 6 Beam member

Claims (2)

In the earth retaining wall constructed by a steel sheet pile and a combination steel sheet pile constructed by adding a stiffening member in the longitudinal direction of the steel sheet pile, the stiffening member has at least one steel sheet pile interval. A retaining wall in which a beam member is disposed between the stiffening member and the stiffening member so as to contact the steel sheet pile.   The retaining wall according to claim 1, wherein the beam member is horizontally arranged and connected between steel sheet piles on which the stiffening member is not installed.

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