JP2005083096A - Lightweight banking method and lightweight banking structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To stably construct a lightweight banking structure without performing excavating operation into an earth surface with a stable gradient i of more than 45°. <P>SOLUTION: A column 4 for mounting a wall surface material is built by a setting system. The other end of the anchor 40 having one end fixed into the ground is fixed to the column 4. A backfilling material 30 is filled between the column 4 and the earth surface 1 to a height having a bottom plate area 31 for stably installing thereon the lightweight banking block 6a on the lowermost stage having a bottom area not deformed by a load placed thereon. The lightweight banking blocks 6 are stacked on the block as an installation base. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a lightweight embankment method using a polystyrene foam (EPS) block or the like as a lightweight embankment material and a lightweight embankment structure.

  As one of the embankment methods on soft ground or landslide land, for example, as in the EPS method, resin foam blocks such as expanded polystyrene (EPS) blocks are stacked in multiple stages to form a lightweight embankment layer on top of the road structure A lightweight embankment method in which a body or the like is installed is known (see, for example, Patent Document 1: JP 2002-294710 A). This construction method is widely used in various civil engineering works because it exerts excellent effects in reducing the cost for ground improvement and shortening the construction period.

  FIG. 3 shows an example of a structure constructed by a lightweight embankment method. After excavating an existing natural ground surface 1 to a stable slope i to form a new natural ground surface 2, a mounting material for the wall material 3. The pillar 4 which is a steel material such as H steel that functions as a mortar is built in by a rooting method. In some cases, the root-wrapped concrete 5 is driven around the support column 4. The support column 4 is constructed using the root-wrapped concrete 5 as an installation base or a back-filling material such as a crushed stone filled between the earth retaining panel 2 attached to the support column 4 and the ground surface 2 or a crushed material of a recovered resin ingot. And light weight embankment material 6 are piled up in multiple stages between the new ground surface 2. And the concrete floor slab 7 is made on it, and the road structure 8 etc. are made further. In order to ensure the stability of the lightweight embankment structure against the load from the road structure 8, an anchor 9 having one end fixed to the ground is attached to the concrete floor slab 7.

  In the lightweight embankment structure of the form shown in FIG. 3, when the back slope is equal to or less than the stable slope i, the back earth pressure applied to the light weight fill layer is zero, and the column 4 is stable. Since the back earth pressure acts when it is steeper than the stable slope, the ground is usually excavated to the stable slope i so as to eliminate the back earth pressure applied to the lightweight embankment layer. The stability gradient varies depending on the soil quality or the surface condition of the natural ground (for example, the natural ground on the stone surface), and there is a soil ground with a relatively steep slope.

  Even when the stability gradient i of the back ground is steep (for example, 45 ° or more), the back earth pressure applied to the lightweight embankment layer is almost zero, and the embedded support column 4 is stable. However, when the slope of the back ground is steep, the upper load acts on the bottom block 6a of the light-weight embankment piled up and may compress and deform. In order to prevent this deformation, the lowermost block 6a needs to have a certain receiving area, and when a light-weight embankment structure is constructed on a soil ground with a relatively steep slope i. Even in such a case, a certain amount of excavation work is required in order to secure an installation base having only the receiving area (block width) of the lowermost block 6a. The initial stable gradient may be lost by this excavation, and in that case, it is necessary to excavate the entire ground until a new stable gradient is obtained.

JP 2002-294710 A

  In the case of a natural mountain with a steep slope exceeding 45 °, if you can build up a pillar with a built-in type and use the natural mountain surface as a back natural mountain as it is, Since no excavation work is required for the natural ground, the construction cost is greatly reduced. However, as described above, it is necessary to provide the lowermost light-weight embankment block with an area that does not deform due to an overload, and excavation work in the vicinity where the column is built is inevitably necessary.

  A stable installation base for a wide, lightweight embankment material can be constructed by building a support in front of the position to be built and filling it with a backfill material. However, this method increases the amount of lightweight embankment as long as it projects forward, and increases the required land area. Further, when the amount of backfilling material to be filled increases, the side pressure applied to the support by the backfilling material becomes a value that cannot be ignored. Although it is conceivable to fill the backfilling material to a high level until the required installation base area (width) is obtained, the backfilling material is lighter than concrete but heavier than the lightweight embankment. When the material is filled, it acts as a side pressure on the support. As a result, there is a risk that the column becomes unstable.

  When the lightweight embankment material is a foamed resin block, the necessary installation base area (width) can be reduced to some extent by using a block with a higher density than the other blocks as the bottom block or its nearby block, There is a limit. In addition, the cost of the high-density foamed resin block is high, and further, the construction is troublesome in that different types of foamed resin blocks are used at the same site.

  The present invention has been made in view of the circumstances as described above, and it is possible to maintain a stable slope as it is even for a steep slope that exceeds 45 ° and is special. A new lightweight embankment method and a lightweight embankment structure that enable stable construction of light-weight embankment materials without using a light-weight embankment material and without using land that is larger than the required land area. The purpose is to provide a body.

  The light weight embankment method according to the present invention for solving the above-mentioned problem is that the wall material mounting support is built into the ground by the rooting method, and the light weight embankment material is piled up in multiple stages between the support and the ground, and then lightweight. In the lightweight embankment method having at least a step of building a road structure on the embankment material, a step of attaching the other end of the anchor having one end fixed in the ground to the built-in wall material attachment strut, and the strut and the ground And a step of filling a backfill material that serves as an installation base for the lightweight embankment material between the mountains.

  In the construction method of the present invention, a step of placing root-wrapped concrete may be included in order to stabilize the built-up struts. In addition, as a back-filling material that functions as an installation base for a lightweight embankment material, a material such as crushed stone or a crushed material of a recovered resin ingot can be used.

  The construction method of the present invention, except for the process that the present inventors have performed for the first time, attaches the other end of the anchor, one end of which is fixed in the ground, to a pillar such as H-steel built into the ground by a rooting type. The other steps may be basically the same as those of the conventionally known lightweight embankment method. In addition, the construction method of the present invention is particularly effective as a construction method in the case of constructing a lightweight embankment structure for a natural ground that is stable at a steep slope exceeding 45 °, but has a gentler stable slope. The same applies to the construction of a lightweight embankment structure for natural ground.

  In the construction method of the present invention, the other end of the anchor having one end fixed in the ground is attached to the support built in the ground, and has high stability against the side pressure from the backfilling material. Therefore, even if the backfill material is filled from the ground to a high position, the standing state of the support column does not become unstable due to the side pressure received from the backfill material. Therefore, when construction is performed on a stable ground with a steep slope exceeding 45 °, it is a low plate that can stably install the lowermost light-weight embankment block with an area that does not deform due to an overload. Until the area is obtained, the filling height of the backfill material can be increased. This means that the excavation work conventionally required for the natural ground to be constructed can be omitted, which leads to a significant reduction in construction cost.

  The upper surface of the backfill material filled in such a manner is used as an installation base, and between the embedded strut and the existing ground surface, in the same manner as in the conventional construction method, for example, an EPS block A lightweight banking structure according to the present invention can be obtained by stacking various lightweight banking materials in multiple stages and further building a road structure or the like thereon in the same manner as in the conventional construction method.

  In the lightweight embankment structure according to the present invention, the method of attaching the other end of the anchor to the column is arbitrary, but the anchor pedestal is attached to the column, and the other end of the anchor having one end fixed in the ground is used for the anchor pedestal. The fixing mode is preferable in terms of work efficiency. Construction efficiency can be further improved by manufacturing a column with an anchor base attached integrally by welding or bolting at the factory and bringing it into the construction site. Only the anchor pedestal may be manufactured at the factory, and may be fixed integrally to the support column by appropriate means such as bolting at the construction site. This method is desirable in construction sites that require long struts. In the latter case, it is possible to proceed with the construction while easily adjusting the attachment position of the other end of the anchor to the column so as to be an optimum position at each construction site.

  The backfilling material is lighter than concrete and can effectively reduce the lateral pressure acting on the struts and effectively function as a drainage layer. On the other hand, there is a risk that the backfill material will be washed away with drainage while scraping the ground. In order to avoid that, it is a preferable aspect that the bottom end of the earth retaining panel attached between the support columns is in a state of entering the ground.

  In the lightweight embankment structure of the present invention, the attachment position of the support column and the other end of the anchor is arbitrary on the condition that stability is provided to the embedded support column, and can be appropriately set while considering the ease of work. Good. Usually, it is easy to attach the anchor so that the other end of the anchor is fixed at a position close to the foundation ground of the support, but the degree of the effect on the stability of the support is small. The higher the fixing position of the other end of the anchor, the greater the degree of influence on the stability of the column, but the anchor mounting operation becomes difficult. When the anchor protrudes to the lightweight embankment layer, it becomes difficult to stack the light embankment material. On the other hand, when light-weight embankment materials such as foamed resin blocks are piled up on a natural ground under a stable slope as described above, the back-surface earth pressure applied to the light-weight embankment layer becomes substantially zero, and the effect of the light-weight embankment layer on the struts Is small. However, the backfilling material is heavier than the lightweight embankment material, even if it is lighter than the concrete. Therefore, when the backfilling material is filled at a high height, it acts as a side pressure on the column. Therefore, it is most effective in terms of cost effectiveness to attach the anchor so that the other end of the anchor is fixed near the upper end surface of the backfill material.

  In the lightweight embankment method and the lightweight embankment structure of the present invention, the other end of the anchor having one end fixed in the ground is attached to the pierced support column, and the height of the backfill material that becomes the installation base of the lightweight embankment material Even if the height is increased, the posture of the column does not become unstable due to the lateral pressure. Therefore, it becomes possible to fill the backfilling material at an arbitrary height, and as a result, even when a light weight embankment method is applied to a ground that is stable at a steep slope exceeding 45 °, it is conventional. As described above, the work of excavating the ground and ground can be omitted so as to obtain a low plate area that can stably install the lowermost lightweight embankment block having an area that does not deform due to the overload, Construction costs are greatly reduced.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic view showing a lightweight embankment structure constructed according to the present invention, and FIG. 2 is a schematic view showing one form for fixing the other end of an anchor having one end fixed in the ground to a column. . In the present invention, the natural ground surface 1 to be constructed is a surface of the masonry 10 with an angle exceeding 45 °, for example, and therefore, the stable gradient i is formed as it is. As described above, in such a case, in the conventional construction method, in order to obtain an upper area of the backfilling material that can stably install the lowermost light weight embankment block 6a having a bottom area that does not deform due to an overload. In addition, excavation work near the foundation ground of the support and the natural ground surface was absolutely necessary.

  In the embodiment shown in FIG. 1, a high backfill with a bottom slab area 31 that can stably install the lowermost light-weight embankment block 6a having a bottom area that does not deform due to an overload without performing such excavation. The material 30 is filled between the support column 4 and the natural ground surface 1. In construction, the anchor hole 41 is drilled at a predetermined angle at a predetermined position on the natural ground, and one end of the anchor 40 is fixed thereto by an appropriate means such as concrete placement. Next, using a heavy machine such as a boring machine, the column 4 is built in a predetermined position at a predetermined position.

  As shown in FIG. 2, a retaining panel (lateral sheet pile) 32 is attached between the built-in columns 4 and 4 so as to be along the ground. The height of the earth retaining panel 32 is substantially the same as the height of the upper surface of the backfill material 30 to be filled. Preferably, the lower end side 32a of the earth retaining panel 32 enters the ground. The anchor base 41 is fixed at a predetermined position of the column 4, preferably at substantially the same height as the upper surface height of the backfill material 30 to be filled, and the other end 42 of the anchor 40 is tensioned by using the anchor base 41. Fix it. As shown in FIG. 2, the base plate 43 may be welded to the support column 4, and an anchor base 41 manufactured separately at the factory may be attached with bolts 44. The support base 41 is fixed in advance at the factory. You may make it and bring it to the construction site. Instead of using such an anchor base 41, the other end of the anchor 40 may be directly fixed to the column 4 by an appropriate means.

  In this state, a backfilling material 30 such as a crushed stone or a crushed product of a recovered resin ingot is filled between the earth retaining panel 32 and the ground surface 1 to a predetermined height. Here, as described above, the height of the backfilling material 30 is such that a bottom slab area 31 capable of stably installing the lowermost light-weight embankment block 6a having a bottom area that does not deform due to an overload is obtained. Set as height. Due to the high height, the support column 4 receives the lateral pressure of the backfilling material 30 heavier than the lightweight embankment material 6, but the support column 4 is supported by the anchor 40 and the posture does not become unstable. .

  The upper surface side of the filled backfill material 30 is used as an installation base, and a light-weight embedding material 6 such as an EPS block is stacked between the support column 4 and the ground surface 1 in the same manner as in the conventional method. Layer. Further, an appropriate wall surface material 3 is attached to the column 4. A concrete floor slab 7 is installed on the stacked lightweight embankment layer, and is stably fixed with anchors 9. Then, the road structure 8 etc. are made and the lightweight embankment structure by this invention is completed.

  In the construction method of the present invention, the backfilling material 30 is used as an installation base for the lightweight embankment material 6. The backfilling material 30 is lighter than concrete, and this construction method can be suitably used even in the field where the ground is soft. Further, the side surface of the backfilling material 30 on the column 4 side is suppressed by the earth retaining panel 32 in which the lower end portion 32a is embedded in the ground, and the backfilling material 30 does not flow out together with the drainage.

Schematic which shows an example of the lightweight banking structure constructed | assembled by this invention. Schematic which shows one form for fixing the other end of the anchor which fixed one end in the ground to a support | pillar. Schematic which shows an example of the structure constructed by the lightweight embankment method.

Explanation of symbols

  i ... stable slope, 1 ... existing ground surface, 2 ... new ground surface after excavation, 3 ... wall material, 4 ... strut, 5 ... root-wrapped concrete, 6 ... lightweight embankment material (block), 6a ... Lightweight embankment block at the bottom, 7 ... Concrete slab, 8 ... Road structure, 9 ... Anchor for concrete slab, 30 ... Backfill, 31 ... Bottom plate area of backfill, 32 ... Earth retaining panel , 40 ... Anchor for the support, 41 ... Anchor base

Claims (4)

  Lightweight with at least a process of building road structures etc. on the lightweight embankment after building up the wall material mounting struts in the ground by the rooting method, stacking light weight embankment materials in multiple stages between the struts and the ground In the embankment method, the process of attaching the other end of the anchor with one end fixed in the ground to the built-in wall material mounting support, and the backfill material that becomes the installation base of the lightweight embankment between the support and the ground A lightweight embankment method characterized by having a filling step.   Wall support brackets built into the ground using the rooting method, anchors with one end fixed in the ground and the other end attached to the column, backfill material filled between the support and ground, and backfill material A lightweight embankment structure comprising at least a light-weight embankment material stacked in a multi-stage as an installation base, and a road structure constructed on the light embankment material.   The lightweight embankment structure according to claim 2, wherein the support has an anchor base, and the other end of the anchor is fixed to the anchor base.   The lightweight embankment structure according to claim 2 or 3, wherein a retaining panel for preventing outflow of the backfilling material is attached to the support column, and a lower end of the retaining panel enters the ground.

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