Earth retaining wall and method of constructing earth retaining wall

Abstract

The present invention provides a retaining wall or similar structure that allows for easy fixing of horizontal sheet piles to retaining piles, etc., primarily through work performed on the front side of the retaining piles, etc. [Solution] The retaining wall 1 comprises adjacent retaining piles 2, fixing members 4 fixed to the front side of each retaining pile 2 and extending laterally from the retaining piles 2, splice members 3 arranged in the height direction along each retaining pile 2 and fixed to the rear side of the fixing members 4, and horizontal sheet piles 5 arranged between adjacent retaining piles 2 and having both ends fixed to the splice members 3 arranged along each retaining pile 2.

Description

Technical Field

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[0001] The present invention relates to a retaining wall and a method for constructing the same.

Background Art

[0002] When excavating the ground, a retaining wall is often provided so that the surrounding ground does not collapse. As a general method for constructing a retaining wall, the parent pile horizontal sheeting method is known. When constructing a retaining wall by the parent pile horizontal sheeting method, after driving H-shaped steel, which is a retaining pile, into the ground, the operations of excavating the ground and inserting horizontal sheeting between the retaining piles are repeated. The excavated part on the back side of the horizontal sheeting is filled with a backfill material such as backfill soil.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] When constructing a retaining wall inside an existing structure, there is a case where a large cavity exists from the beginning on the back side of the retaining pile. In this case, no earth pressure is applied to the horizontal sheeting inserted between the retaining piles from the back, and the horizontal sheeting cannot be held in a predetermined position. When an operator enters the cavity on the back side, it is conceivable to fix the horizontal sheeting to the retaining wall by the work inside the cavity, but there are cases where the work inside the cavity is difficult due to problems such as space.

[0005] The present invention has been made in view of the above problems, and an object thereof is to provide a retaining wall or the like that can easily fix a horizontal sheeting to a retaining pile or the like mainly by the work on the front side of the retaining pile or the like.

Means for Solving the Problems

[0006] The first invention for achieving the aforementioned objective is a retaining wall characterized by comprising: adjacent vertical steel members; fixing members fixed to the front side of each vertical steel member and extending laterally to the vertical steel member; splice members arranged in the height direction along each vertical steel member and fixed to the rear side of the fixing member; and horizontal sheet piles arranged between adjacent vertical steel members, with both ends fixed to the splice members arranged along each vertical steel member.

[0007] In this invention, splice members positioned vertically along vertical steel members such as retaining piles are fixed to the front side of the vertical steel members and to the rear side of fixing members extending laterally from the vertical steel members, and the ends of horizontal sheet piles positioned between adjacent vertical steel members are fixed to the splice members. This allows horizontal sheet piles to be easily fixed to the vertical steel members by working on the front side of the vertical steel members.

[0008] It is desirable that the fixing member be positioned so as to span between adjacent vertical steel members. This allows the spacing between the vertical steel members to be kept constant by the fixing members.

[0009] At least one of the aforementioned vertical steel members is a retaining pile. Vertical steel members are typically retaining piles driven into the ground.

[0010] The retaining wall is provided inside the existing structure, and at least one of the vertical steel members is fixed to the front side of the existing structure via connecting steel members and positioned between the upper and lower existing beams. When constructing a retaining wall inside an existing structure, in areas where retaining piles cannot be driven due to the presence of existing beams, as described above, vertical steel members can be connected to the existing structure, and the ends of horizontal sheet piles can be fixed to splice members installed vertically along the vertical steel members.

[0011] The second invention is a method for constructing a retaining wall, comprising the steps of: arranging vertical steel members adjacent to each other; fixing a fixing member extending laterally to the front side of each vertical steel member; fixing a splice member arranged in the height direction along each vertical steel member to the rear side of the fixing member; and arranging horizontal sheet piles between adjacent vertical steel members and fixing both ends of the horizontal sheet piles to the splice members arranged along each vertical steel member. [Effects of the Invention]

[0012] According to the present invention, it is possible to provide a retaining wall or the like in which horizontal sheet piles can be easily fixed to retaining piles, etc., mainly by working on the front side of the retaining piles, etc. [Brief explanation of the drawing]

[0013] [Figure 1] A diagram showing the outline of retaining wall 1. [Figure 2] A plan view showing a portion of retaining wall 1. [Figure 3] A diagram showing the front of retaining wall 1. [Figure 4] A diagram illustrating the construction method of retaining wall 1. [Figure 5] An example of fastener 4. [Figure 6] A plan view showing a portion of retaining wall 1a. [Figure 7] A diagram showing the front of retaining wall 1a. [Figure 8] A diagram illustrating the construction method of retaining wall 1a. [Figure 9] A diagram illustrating the construction method of retaining wall 1a. [Modes for carrying out the invention]

[0014] Preferred embodiments of the present invention will be described in detail below with reference to the drawings.

[0015] [First Embodiment] FIG. 1 is a diagram showing an outline of the retaining wall 1 according to the first embodiment of the present invention. As shown in FIG. 1, the retaining wall 1 is provided in an existing structure 6 having an existing wall 61, an existing column 62, an existing beam 63, etc., and the existing wall 61 exists on the rear side thereof. A cavity 10 is formed between the existing wall 61 and the retaining wall 1. Here, the "rear (rear side)" refers to the ground side behind the existing structure 6. The opposite side, that is, the inner side of the existing structure 6, is referred to as the "front".

[0016] The retaining wall 1 is formed by the parent pile cross-lumber method in which cross-lumber 5 is arranged between a plurality of retaining piles 2. Details thereof will be described later. The retaining piles 2 are arranged at intervals in the extending direction in the plane of the existing wall 6 (corresponding to the direction normal to the plane of FIG. 1), and a plurality of upper and lower stages of cross-lumber 5 are provided between adjacent retaining piles 2.

[0017] Vertical steel materials such as H-shaped steel are used for the retaining piles 2. In the example of FIG. 1, a soil-cement diaphragm wall S is formed in the foundation ground of the existing structure 6, and the retaining pile 2 is an extension upward of the core material driven into the soil-cement diaphragm wall S. That is, below the existing structure 6, the soil-cement diaphragm wall S is provided as a retaining structure, and inside the existing structure 6, the retaining wall 1 by the parent pile cross-lumber method is provided. However, it is not limited to this, and the retaining pile 2 may be directly driven into the foundation ground of the existing structure 6.

[0018] FIG. 2 is a plan view showing a part of the retaining wall 1. FIG. 3 is a view showing the front surface of the retaining wall 1 in FIG. 2. As shown in FIGS. 2 and 3, the retaining wall 1 has, in addition to the above-described retaining piles 2 and cross-lumber 5, an attachment member 3, a fixing member 4, etc.

[0019] The attachment member 3 is a columnar member used for attaching the cross-lumber 5, and is arranged in the height direction along both end portions of the flange on the front surface side of the retaining pile 2. Wood is used as the attachment member 3, but it is not limited to this.

[0020] The fixing member 4 is a component for attaching the splice member 3 to the retaining pile 2. The fixing member 4 is made of steel material such as angle material and is fixed to the flange on the front side of the retaining pile 2 by welding or the like. The fixing member 4 is positioned horizontally in front of the retaining pile 2, spanning between adjacent retaining piles 2. The splice member 3 is attached to the retaining pile 2 via the fixing member 4 by fixing the splice member 3 to the rear side of the fixing member 4 with screws 31.

[0021] The horizontal sheet pile 5 is a rectangular plate, and both ends in the longitudinal direction are fixed by screws 51 to splice members 3 that are positioned along the opposing side ends of the flanges of adjacent retaining piles 2.

[0022] To construct the retaining wall 1, first, as shown in Figure 4(a), retaining piles 2 are installed at predetermined intervals, and then, as shown in Figure 4(b), the fixing members 4 are fixed to the flanges on the front side of the retaining piles 2 by welding or other means.

[0023] Next, as shown in Figure 4(c), splice members 3 are placed along both ends of the flange on the front side of the retaining pile 2, and the splice members 3 are fixed to the rear side of the fixing member 4 with screws 31. In addition, the distance D between adjacent retaining piles 2 is measured at multiple points in the height direction, and the sheet piles 5 are cut according to the measurement results.

[0024] In this embodiment, the length of the horizontal sheet pile 5 is cut to be greater than the maximum value of the spacing D, and markings (not shown) for checking the insertion length are placed at positions away from both ends in the longitudinal direction of the horizontal sheet pile 5 (towards the longitudinal center of the horizontal sheet pile 5). For example, the length of the horizontal sheet pile 5 is 100 mm greater than the maximum value of the spacing D, and the markings are placed at positions 110 mm inward from both ends in the longitudinal direction of the horizontal sheet pile 5, but this is not the only example.

[0025] Subsequently, as shown in Figure 2, horizontal sheet piles 5 are placed between adjacent retaining piles 2, and both longitudinal ends of the horizontal sheet piles 5 are fixed with screws 51 to splice members 3 placed along each retaining pile 2. At this time, the distance from the side end of the flange on the front side of the retaining pile 2 to the marking position of the horizontal sheet pile 5 is measured and controlled so that the overlap d of the horizontal sheet pile 5 on the retaining pile 2 is a predetermined length (for example, 40 mm or more).

[0026] Once the horizontal sheet piles 5 are fixed in place, sealant (not shown) is applied between the upper and lower horizontal sheet piles 5, and between the flange on the front side of the retaining pile 2 and the splice material 3, and backfill material (not shown) is filled into the cavity 10. The backfill material may be, but is not limited to, man-made soil (fluidized soil), sand, or soil.

[0027] As described above, in this embodiment, the splice member 3, which is positioned in the height direction along the retaining pile 2 driven into the ground, is fixed to the front side of the retaining pile 2 and to the rear side of the fixing member 4 that extends laterally from the retaining pile 2, and the ends of the horizontal sheet piles 5, which are positioned between adjacent retaining piles 2, are fixed to the splice member 3. This makes it possible to easily fix the horizontal sheet piles 5 to the retaining piles 2 mainly by working on the front side of the retaining piles 2.

[0028] In this embodiment, the fixing member 4 is positioned to span between adjacent retaining piles 2, and the fixing member 4 can maintain a constant distance between the retaining piles 2.

[0029] However, the present invention is not limited to the embodiments described above. For example, in this embodiment, the fixing member 4 is continuous at the position of the retaining pile 2, but as shown in Figure 5(a), the fixing member 4 may be divided at the position of the retaining pile 2 and placed only between a pair of adjacent retaining piles 2. Also, in this embodiment, the fixing member 4 is arranged to span between adjacent retaining piles 2, but as shown in Figure 5(b), the fixing member 4 may be made into shorter pieces and be discontinuous between adjacent retaining piles 2.

[0030] In this embodiment, the horizontal sheeting 5 is attached to the retaining pile 2, but the vertical steel members to which the horizontal sheeting 5 is attached are not limited to this. Below, an example in which the vertical steel members to which the horizontal sheeting 5 is attached are different will be described as a second embodiment. The differences between the second embodiment and the first embodiment will be explained, and similar components will be denoted by the same reference numerals in the figures, etc., and their explanation will be omitted.

[0031] [Second Embodiment] Figure 6 is a plan view showing a part of the retaining wall 1a according to the second embodiment of the present invention. Figure 7 is a view showing the front of the retaining wall 1a in Figure 6. The retaining wall 1a of the second embodiment is an example in which, in a location where retaining piles 2 cannot be driven due to the presence of existing beams 63 (see Figure 1) connected to existing columns 62, vertical steel members 8 are provided instead of retaining piles 2, thereby reducing the length of the horizontal sheet piles 5 and ensuring the pressure resistance performance of the retaining wall 1a.

[0032] The retaining wall 1a includes retaining piles 2, splice members 3, fixing members 4, horizontal sheeting 5, connecting steel members 7, vertical steel members 8, etc., with the horizontal sheeting 5 positioned between the retaining piles 2 and the vertical steel members 8.

[0033] The vertical steel member 8 is a steel member such as an H-beam arranged vertically, and is installed in the planar position where the existing beam 63 exists. The existing beam 63 is connected to the existing column 62 located behind the vertical steel member 8. The vertical steel member 8 is fixed to the front side of the existing column 62 via a connecting steel member 7. The vertical steel member 8 is positioned between the upper and lower existing beams 63.

[0034] The connecting steel member 7 is, for example, a steel member such as an angle iron, and is positioned horizontally so as to extend forward from the existing column 62. A fixing piece 71, which is a steel member such as an angle iron positioned vertically, is fixed to one end of the connecting steel member 7 in the longitudinal direction by welding or the like. The fixing piece 71 is fixed to the front of the existing column 62 using a fixing material such as a chemical anchor 72.

[0035] A support member 81 made of steel, such as an angle material, is fixed to the rear flange of the vertical steel member 8 by welding or the like, and the other end of the connecting steel member 7 in the longitudinal direction is fixed to the support member 81 by welding or the like.

[0036] A support member 82 made of steel, such as an angle steel, is fixed to the front flange of the vertical steel member 8 by welding or the like. The middle section of the fixing member 4 in the longitudinal direction is fixed to the support member 82 by welding or the like.

[0037] The splice members 3 are positioned in the height direction along both ends of the front flange of the vertical steel member 8. One end of the horizontal sheet pile 5 in the longitudinal direction is fixed to the splice member 3 using screws 51, as in the first embodiment. The splice member 3 is also fixed to the fixing member 4 using screws 31, as in the first embodiment. As a result, one end of the horizontal sheet pile 5 in the longitudinal direction is attached to the vertical steel member 8 via the fixing member 4.

[0038] The other end of the horizontal sheet pile 5 in the longitudinal direction is attached to the retaining pile 2 using the splice material 3 and the fixing material 4 in the same manner as in the first embodiment.

[0039] To construct the retaining wall 1a, first, as shown in Figure 8(a), retaining piles 2 are installed at predetermined intervals, and as shown in Figure 8(b), fixing pieces 71 are fixed to the front of the existing columns 62 using chemical anchors 72. Then, as shown in Figure 8(c), one end of the connecting steel material 7 in the longitudinal direction is fixed to the fixing piece 71 by welding or the like.

[0040] Subsequently, as shown in Figure 9(a), the rear support member 81 of the vertical steel member 8 is fixed to the other end of the connecting steel member 7 in the longitudinal direction by welding or the like. This fixes the vertical steel member 8 to the other end of the connecting steel member 7. The connecting steel members 7 are arranged in multiple layers vertically, and the vertical steel member 8 is fixed to the other end of each connecting steel member 7. The vertical steel member 8 is positioned between the upper and lower existing beams 63.

[0041] Next, as shown in Figure 9(b), a fixing member 4 is placed in front of the vertical steel member 8. The fixing member 4 is fixed by welding or the like to the flange on the front side of the retaining pile 2 or to the receiving member 82 on the front side of the vertical steel member 8.

[0042] Subsequently, as shown in Figure 9(c), splice members 3 are placed along both ends of the front flange of the retaining pile 2 and along both ends of the front flange of the vertical steel member 8, and these splice members 3 are fixed to the rear side of the fixing member 4 with screws 31, as described above. Then, as described above, the distance between adjacent retaining piles 2 and vertical steel members 8 is measured, and the horizontal sheet piles 5 are cut according to the measurement results.

[0043] Next, as shown in Figure 6, horizontal sheet piles 5 are placed between adjacent retaining piles 2 and vertical steel members 8. One end of the horizontal sheet pile 5 in the longitudinal direction is fixed to the splice member 3 on the vertical steel member 8 side with screws 51. The other end of the horizontal sheet pile 5 in the longitudinal direction is fixed to the splice member 3 on the retaining pile 2 side with screws 51. After fixing the horizontal sheet piles 5, as described above, sealant is applied to the gaps between the upper and lower horizontal sheet piles 5 and the gaps between the flanges of the vertical steel members 8 and retaining piles 2 and the splice member 3, and backfill material is filled into the cavity 10.

[0044] In the second embodiment, when constructing a retaining wall 1a inside the existing structure 6, in locations where retaining piles 2 cannot be driven due to the presence of existing beams 63, a vertical steel member 8 can be connected to the existing column 62 of the existing structure 6, and the ends of the horizontal sheet piles 5 can be fixed to the splice members 3 provided along the vertical steel member 8. This provides the same effects as in the first embodiment. Furthermore, since the vertical steel member 8 is supported from the rear side of the existing structure 6 (existing column 62), it does not interfere with work performed on the front side of the retaining wall 1a.

[0045] In addition, in the retaining wall 1a, reinforcing steel materials such as structural steel or angle materials (not shown) may be provided between the retaining piles 2 and the connecting steel material 7 to reinforce the support mechanism of the vertical steel material 8.

[0046] Preferred embodiments of the present invention have been described above with reference to the attached drawings, but the present invention is not limited to these examples. It will be obvious to those skilled in the art that various modifications or alterations can be conceived within the scope of the technical idea disclosed herein, and these will naturally also fall within the technical scope of the present invention. [Explanation of Symbols]

[0047] 1, 1a: Mountain retaining wall 2: Yamadome pile 3: Adhesive material 4:Fixing material 5: Horizontal sheet piles 6: Existing structure 7: Connecting steel material 8: Vertical steel 31, 51: Bis 10: Cavity 61: Existing wall 62: Existing pillars 63: Existing beams

Claims

1. The vertical steel members are placed next to each other, A fixing member is fixed to the front side of each vertical steel member and extends laterally to the vertical steel member, A splice member is positioned in the height direction along each vertical steel member and fixed to the rear side of the fixing member, A horizontal sheet pile is positioned between adjacent vertical steel members, and both ends of the sheet pile are fixed to the splice members positioned along each vertical steel member, A retaining wall characterized by having the following features.

2. The retaining wall according to claim 1, characterized in that the fixing member is arranged to span between adjacent vertical steel members.

3. The retaining wall according to claim 1, characterized in that at least one of the vertical steel members is a retaining pile.

4. The aforementioned retaining wall is installed inside the existing structure. The retaining wall according to claim 1, characterized in that at least one of the vertical steel members is fixed to the front side of the existing structure via a connecting steel member and is positioned between the upper and lower existing beams.

5. The process of arranging vertical steel members adjacent to each other, The process involves fixing a fixing member that extends laterally to the vertical steel member to the front side of each vertical steel member, The process involves fixing splice members, which are positioned in the height direction along each vertical steel member, to the rear side of the fixing member. The process involves arranging horizontal sheet piles between adjacent vertical steel members and fixing both ends of the horizontal sheet piles to the splice members arranged along each vertical steel member, A method for constructing a retaining wall characterized by comprising the following:

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