JP2007197954A - Earth retaining wall construction method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To construct a highly accurate and strong earth retaining wall while restraining a cost increase. <P>SOLUTION: Reinforcing bodies 14 are buried in a multilayered shape in a banking part 5 formed by gradually banking up high by layering a banking layer. These reinforcing bodies 14 reinforce respective main piles 10 in the height direction in a large number of positions for gradually making large pressure act for increasing the height of the banking part 5, and restrain stress displacement of the main piles 10. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention sets up a self-supporting parent pile with a predetermined interval along a retaining line, and a retaining wall constructed by combining a plurality of horizontal sheet piles in the height direction of each of the parent piles. It relates to the construction method.

  The retaining wall is generally constructed by setting up self-supporting parent piles at predetermined intervals along the retaining line and combining each side pile with a plurality of horizontal sheet piles in the height direction. Hold the embankment raised to the height of. For example, the method called mountain retaining construction is a method that constructs earth retaining walls by adopting it for widening construction of roads constructed along slopes and roads constructed along places where the supporting capacity of foundation ground is weak. is there. For example, the pile construction method includes a pile construction method in which rail piles such as rails, I-shaped steels and H-shaped steels are placed on top of each other along the earth retaining line to construct reinforced standing walls, or relatively heavy precast concrete. The panel construction method etc. which construct a reinforcement standing wall by installing panel bodies, such as a panel adjacent, are carried out.

  In the retaining wall, in the case of a self-supporting parent pile made of, for example, H-shaped steel that does not have horizontal support, the bending stress increases due to the deformation from the wall surface by the embankment to the front side. For the retaining wall, a wall having a height of about 4 m is the applicable limit for this purpose, and it is possible to use an anchor material that applies tension from the front surface and a reinforcing material such as a retaining pile supported from the back surface. However, such a retaining wall also increases the construction cost, it is difficult to efficiently exert the anchor action by the anchor material, or the parent pile is moved forward by the embankment that is thrown in before the reinforcement material is installed. The problem of being inclined to occur.

  Moreover, in the panel method, it is possible to install the panel easily, and the problem of vibration and noise is reduced, and construction at a relatively low cost is possible. However, in such a panel construction method, the vertical ground reaction force of the wall surface part increases due to the weight of the panel itself, the vertical component force of the embankment, etc. There is a problem that it cannot be applied due to ground subsidence.

  As the mountain retaining method, a parent pile horizontal sheet pile method, which is a combination of the above-mentioned parent pile method and a kind of panel method, is also implemented. The main pile side sheet pile method is a method of using sheet piles such as wood sheet piles, lightweight steel sheet piles or concrete sheet piles selected according to the load in parallel with excavation between the parent piles placed at appropriate intervals along the retaining lines. It is a construction method that combines and holds the earth (see, for example, Patent Documents 1 to 3). The parent pile sheet pile method is lower in cost than the steel sheet pile method in which steel sheet piles are placed side by side, and it is effective for environmental measures such as noise and vibration, etc. It has the following features.

Japanese Patent Publication No. 6-99908 JP-A-9-95938 JP 2005-201209 A

  By the way, the parent pile horizontal sheet pile method disclosed in Patent Document 1 is filled with a foamable backfill material between the horizontal sheet pile and the excavation surface, and is made to face the earth pressure from the natural ground by the expansion pressure generated in the foaming stage. Like that. In such a main pile horizontal sheet pile method, since it receives the pressure from the excavation surface side by the main pile and the horizontal sheet pile, it cannot be applied to a retaining wall construction having a large height. Moreover, in this parent pile horizontal sheet pile construction method, there exists a problem that it becomes expensive because a foamable backfill material is used.

  Moreover, the main pile side sheet pile construction method disclosed in Patent Document 2 is connected to each other by inserting a plurality of horizontal sheet piles that are combined in multiple stages between the respective parent piles, thereby improving the strength. I try to figure it out. In such a main pile horizontal sheet pile method, a horizontal sheet pile in which a plurality of through holes for penetrating a steel bar is used, but each horizontal sheet pile forms a through hole, which increases the cost and mechanical strength. There is a problem that it falls. In addition, in such a main pile horizontal sheet pile method, for example, when construction is performed on soft ground, each parent pile is likely to cause a heaving phenomenon due to insufficient passive earth pressure at the basement part, and horizontal displacement is caused by pressure from the embankment. The problem that is likely to occur is not solved. In addition, in such a main pile horizontal sheet pile method, each horizontal sheet pile is supported by the main pile that is likely to be displaced, so it is extremely difficult to make the axis of the through-hole formed in each of them match and penetrate the steel rod. is there.

  Furthermore, in the parent pile side sheet pile method disclosed in Patent Document 3, a cross wall constructed by combining a side sheet pile between parent piles is fixed across each parent pile, and the cross member and the mountain side Reinforced by anchor members disposed between the soils. Even if it is possible to construct a retaining wall with a large mechanical strength, such a pile pile sheet pile construction method is costly for the cross member and its mounting, and the support pressure for the soft ground and the pile pile is sufficient. In construction at the site that cannot be secured, there is a problem that the function of the cross member and the anchor member is not exhibited.

  Therefore, the present invention suppresses the stress displacement of the parent pile to which a gradually increasing pressure is applied as the height of the embankment portion is increased by simple construction, and allows the construction of a strong earth retaining wall. It was proposed for the purpose of providing a retaining wall construction method.

  The retaining wall construction method according to the present invention that achieves the above-described object is to provide a self-supporting parent pile with a predetermined interval along the retaining line, and a plurality of horizontal A retaining wall is constructed to hold the embankment part that is embanked at a predetermined height by combining sheet piles in the height direction. The earth retaining wall construction method is a unit embankment layer forming step for forming an embankment layer with a height that exposes the upper part of each lateral sheet pile by performing earthing and rolling, compacting and compacting the earth retaining wall, The reinforcing body laying step of laying the free end side of the reinforcing body having one end side fixed to the back side of the horizontal sheet pile or the main pile on the foundation surface or the surface of the unit embankment layer formed by the embankment layer forming step is repeatedly performed. . In the retaining wall construction method, unit embankment layers are stacked to form the embankment part of a predetermined height that is held by the earth retaining wall composed of the main pile and cross-sheet piles, and embedded in multiple layers within this embankment part. Reinforced bodies reinforce each parent pile in multiple stages in the height direction.

  According to the earth retaining wall construction method according to the present invention, the reinforcing body is embedded in multiple layers in the embankment portion formed by laminating the embankment layer and gradually raising the embedding layer, and these reinforcement bodies increase the height of the embankment portion. Accordingly, each of the parent piles to which a large pressure is applied is reinforced to suppress the stress displacement of the parent pile. According to the retaining wall construction method, it is possible to construct a strong retaining wall by suppressing the stress displacement of each parent pile. According to the earth retaining wall construction method, even on the ground where it is difficult to secure sufficient ground pressure or sufficient support pressure, the reinforcement piles are used to reinforce each parent pile from the formation of the lower layer of the embankment and suppress its horizontal displacement. At the same time, it is possible to construct a high-accuracy and strong earth retaining wall by eliminating the supporting force and settlement of each sheet pile. The retaining wall construction method eliminates the need for new components and construction procedures, and can reduce the number of low-standard parent piles or the distance between the parent piles. Reduced to

  Hereinafter, the retaining wall construction for constructing the retaining wall 4 along the excavation site 3 is carried out in road construction for widening the road 2 provided along the inclined surface 1 shown in the drawings as an embodiment of the present invention. The method will be described in detail. The retaining wall construction method is not limited to such road construction, for example, a place where the supporting capacity of the foundation ground such as soft ground is weak, a place where underground buried objects are congested and its avoidance treatment is difficult, or noise and vibration The present invention is also effectively applied to the construction of the retaining wall 4 that holds the embankment part 5 such as construction work of an underground structure in a place where environmental measures are required. The retaining wall construction method is also employed when the retaining wall 4 that holds the embankment raised at a predetermined height on a flat ground or the like is constructed.

  In road construction work, details will be described later. As shown in FIG. 1, excavation is performed along the inclined surface 1 with a predetermined width and depth, and earth and sand are put into the excavation site 3 for compaction and compaction. By doing so, the embankment portion 5 having a predetermined height is formed on the bottom surface 3A of the excavation portion. In road construction work, the embedding part 5 is configured by laminating embankment layers 5A to 5U in a predetermined height on the excavation part bottom surface 3A. In road construction work, the embankment part 5 is held by a retaining wall 4 (retaining wall) constructed along a retaining line 6 by a retaining wall construction method described in detail later. In the road construction work, after ancillary work such as raising the top end and installing the capstone 7 is performed, a predetermined pavement 8 including the embedding part 5 is performed on the surface to complete the road 2.

  The retaining wall construction method is, as will be described later, a large number of self-supporting parent piles, such as H-shaped steels 10A to 10N (hereinafter individually described), which are erected at predetermined intervals along the retaining line 6. And a plurality of cross-sheets, for example, precast concrete panels 11A to 11M (hereinafter, individually described) combined in the height direction between adjacent H-shaped steels 10A and 10B. The retaining wall 4 having a predetermined height is constructed by a general name of the concrete panel 11 unless otherwise specified). In the earth retaining wall construction method, reinforcing bodies, for example, geotextiles 14A to 14K (hereinafter collectively referred to as geotextile 14 unless otherwise described) are provided on the back side of each concrete panel 11, and support steel pipes 12A to 12K. (Hereinafter collectively referred to as the support steel pipe 12 except when individually described) and connecting rods 13A to 13K (hereinafter collectively referred to as the connecting rod 13 except when individually described). The

  The retaining wall construction method is a state in which the concrete panel 11 is combined between the H-shaped steels 10A and 10B, and the geotextile 14 is placed on the support steel pipe 12 which is positioned on the back side of the concrete panel 11 and combined between the H-shaped steels 10A and 10B. One end side is wound and fixed by the connecting rod 13. The earth retaining wall construction method lays the free end side of the geotextile 14 having one end fixed between the H-shaped steels 10A and 10B via the support steel pipe 12 on the embankment portion 5 formed in the lower layer, and on the geotextile 14 An upper embankment portion 5 is formed. In the earth retaining wall construction method, a large number of geotextiles 14 are embedded in multiple layers in the embankment portion 5.

  In the earth retaining wall construction method, not only the H-shaped steel 10 but also an appropriate pile member such as a rail, an I-shaped steel, or a steel pipe pile, which is generally used in conventional mountain retaining works, may be used as the parent pile. In the earth retaining wall construction method, instead of the geotextile 14, for example, a steel rod with an anchor plate or a strip-shaped steel material may be used as the reinforcing body.

  As is well known, the H-shaped steel 10 is a pile member formed in an H-shaped cross-section by connecting the opposing flange portions 16F and 16B over the entire length with a web 15, and flanges are formed along both side surfaces of the web 15. Space portions 17R and 17L surrounded by the portions 16F and 16B are configured over the entire length. In the retaining wall construction method, as shown in FIG. 2, each H-shaped steel 10 causes the space portion 17 </ b> R of the adjacent H-shaped steel 10 </ b> A and the opposed space portion 17 </ b> L of the H-shaped steel 10 </ b> B to face each other, Along the distance, the inclined surface 1 is driven to a predetermined depth with an interval of about 1.5 m to 2.5 m so as to stand upright.

  The H-shaped steel 10 constitutes a so-called horizontal support pile member that holds the retaining wall 4 constructed by receiving the pressure applied from the embankment portion 5 as in the prior art, and constitutes an attachment member for the concrete panel 11. The H-shaped steel 10 is reinforced at multiple points with respect to the height direction by a reinforcing body, which will be described later, so that the occurrence of stress displacement is suppressed and a strong earth retaining wall 4 is constructed.

  As shown in FIG. 2, the concrete panel 11 is formed to have a length substantially equal to the interval between the adjacent H-shaped steels 10A and 10B and a thickness slightly smaller than the width of the space portions 17R and 17L. The concrete panel 11 holds the embedding portion 5 and also has an effect of reinforcing the H-shaped steel 10 by the anchor action of each geotextile 14. In the retaining wall construction method, the suspended concrete panels 11 are dropped from the upper sides of the H-shaped steels 10A and 10B by fitting both ends into the opposing space portions 17R and 17L. Are combined sequentially. In addition, about the concrete panel 11, it is not limited to a precast concrete panel, It is also possible to use appropriate panels, such as a concrete panel formed in the field, and a corrugated sheet steel plate.

  As shown in FIG. 2, the support steel pipe 12 has a length substantially equal to the interval between adjacent H-shaped steels 10 </ b> A and 10 </ b> B and a gap formed between the flange portions 16 </ b> F and 16 </ b> B of the H-shaped steel 10 and the concrete panel 11. Slightly smaller diameter. The support steel pipe 12 is a state in which the concrete panel 11 is combined between the adjacent H-shaped steels 10A and 10B, and the space portion 17R of the adjacent H-shaped steel 10A and the H-shaped steel 10B facing both ends from the back side of the concrete panel 11. It is fitted and assembled in the opposing space portion 17L. The support steel pipe 12 can be assembled so as to be dropped from above between the H-shaped steels 10A and 10B according to the above-described outer diameter. The support steel pipe 12 constitutes a mounting member for the geotextile 14 as will be described later.

  Since the support steel pipe 12 is assembled so as to be sandwiched between the mountain side flange portion 16B of the H-shaped steel 10 and the end portion of the concrete panel 11, the support steel pipe 12 slides in the height direction according to the height of the embankment portion 5. It is possible to make it. Therefore, the support steel pipe 12 can be assembled easily by moving the geotextile 14 downward so that the geotextile 14 is laid on the embankment 5 in a state where the geotextiles 14 are crossed. In addition, about the support steel pipe 12, you may make it use appropriate support members, such as various steel pipes, such as L type steel material, I type steel material, or a square type, for example.

  As is well known, the geotextile 14 is made of a polymer fiber or synthetic resin sheet, and has a reinforcing effect and a drainage reinforcing effect when laid on the embankment. As shown in FIG. 2, the geotextile 14 has a width slightly shorter than the depth of the excavation site, and has a width substantially equal to the interval between the adjacent H-shaped steels 10 </ b> A and 10 </ b> B. In the retaining wall construction method, the geotextile 14 is wound around the support steel pipe 12 that is positioned on the back side of the concrete panel 11 and is supported between the H-shaped steels 10A and 10B, and the folded portion is fixed by the connecting rod 13. The end side is laid on the embankment 5 or the bottom of the excavation.

  In the earth retaining wall construction method, as will be described in detail later, each geotextile 14 having one end fixed between the H-shaped steels 10A and 10B via the support steel pipe 12 is embedded in the embankment portion 5 and has an anchoring action. Thus, the H-shaped steel 10 that receives the pressure from the embankment 5 is held in multiple stages in the height direction. As each of the H-shaped steels 10 is formed by laminating the embankment layers 5 </ b> A to 5 </ b> U, a gradually increasing pressure is applied from the embankment portion 5. In the earth retaining wall construction method, as described above, the geotextiles 14 are embedded at predetermined heights from the initial stage of the embankment construction and are provided in multiple layers in the embankment portion 5 so that the H-shaped steels 10 are arranged in the height direction. Reinforce at multiple locations.

  In the earth retaining wall construction method, each geotextile 14 is fixed to the H-shaped steel 10 by the support steel pipe 12 and the connecting rod 13, but it is needless to say that the structure is not limited to this fixing structure. In the retaining wall construction method, instead of the support steel pipe 12 and the connecting rod 13, for example, a mounting member fixed by welding or the like is provided on the mountain side flange portion 16B of the H-shaped steel 10, and the support steel pipe 12 or the like is directly or directly attached to this mounting member. The geotextile 14 may be combined with a support. In the retaining wall construction method, for example, a key-shaped attachment portion is formed in advance on the back surface of the concrete panel 11, and the geotextile 14 is fixed to the attachment portion directly or by supporting the support steel pipe 12 or the like. It may be.

  Hereinafter, the construction process of the road construction work that employs the retaining wall construction method using the above-described components will be described with reference to FIGS. 1 and 3 to 8. The road construction work shown as the embodiment is a work for widening the cliff side of the road 2 constructed along the inclined surface 1 as shown in FIG. The road construction work is, for example, excavating a region along the road 2 indicated by a chain line with heavy equipment or the like with a predetermined width and height, and having an excavation inclined surface 3B that gradually inclines from the top toward the bottom. Site 3 is formed. In road construction work, the bottom wall 3A of the excavation site 3 is flattened by shaping and sufficient rolling and compacting to flatten the earth retaining wall 4 constructed by the earth retaining wall construction method described later. Use as a reference plane.

  In the road construction work, as shown in FIG. 4, the above-described multiple H-shaped steels 10 along the retaining lines 6 on the bottom surface 3A of the excavated part are replaced with the space parts 17R, 17L facing each other of the adjacent H-shaped steels 10A, 10B. Are driven with a predetermined interval. Each H-shaped steel 10 has an upper end portion that is substantially flush with the road 2 and is driven with a depth that allows it to stand on its own. In road construction work, for example, the ground between the H-shaped steel 10 and the road 2 may be excavated after the H-shaped steel 10 is driven into the inclined surface 1 according to the situation at the site. It is. In the road construction work, the retaining wall 4 is constructed by the retaining wall construction method, which will be described in detail later, with each H-shaped steel 10 as a support member.

  In the retaining wall construction method, the lowermost first concrete panel 11A is lifted by a crane or the like, and the first concrete panel 11A is opposed to adjacent H-shaped steels 10A and 10B as shown by arrows in FIG. Both ends are fitted and combined between 17R and 17L. In the retaining wall construction method, the first concrete panels 11A are abutted against the bottom surface 3A of the excavation part constituting the reference plane between the H-shaped steels 10 and are combined with each other. It is possible to perform the combination while maintaining the degree, and it is possible to accurately combine the plurality of concrete panels 11 with each other.

  In the earth retaining wall construction method, as shown in FIG. 6 with the first concrete panel 11A combined, earth and sand are poured onto the bottom surface 3A of the excavation part, and the earth and sand are pressed and compacted to form the first embankment. Layer 5A is formed. In the earth retaining wall construction method, the first embankment layer 5A is formed with a height that exposes the upper portion of the first concrete panel 11A as shown in FIG. In the earth retaining wall construction method, sufficient rolling pressure and compaction are applied to the input earth and sand to form a strong first embankment layer 5A constituting the lowermost layer of the embankment part 5.

  In the earth retaining wall construction method, as shown in FIG. 7, the first wall is located above the first concrete panel 11 </ b> A exposed from the first embankment layer 5 </ b> A, and the first steel via the support steel pipe 12 and the connecting rod 13. Geotextile 14A is assembled. In the retaining wall construction method, the support steel pipe 12 is suspended by fitting both ends into the opposing space portions 17R and 17L of the adjacent H-shaped steels 10A and 10B. In the retaining wall construction method, the first geotextile 14A is wound around one end side of the support steel pipe 12, and the back of the first concrete panel 11A is fixed by fixing the overlapped portion by the connecting rod 13. It is fixed to the H-shaped steels 10A and 10B on the side. In the retaining wall construction method, the first geotextile 14A has a length in which the tip is opposed to the excavation inclined surface 3B and has a width substantially equal to the interval between the H-shaped steels 10A and 10B. It is done.

  In the retaining wall construction method, the support steel pipe 12 is combined with the H-shaped steels 10A and 10B so as to be dropped into the space portions 17R and 17L from above. In the retaining wall construction method, the support steel pipe 12 interposes the end portion of the first concrete panel 11A between the opposed flange-side flange portions 16F and 16F as shown in FIG. In the earth retaining wall construction method, with the first geotextile 14A fixed, the support steel pipe 12 is positioned between the mountain side flange portions 16B and 16B opposite to the first concrete panel 11A. As shown in the figure, the first geotextile 14A is laid on the first embankment layer 5A.

  In the earth retaining wall construction method, the first geotextile 14A is laid on the surface of the first embankment layer 5A formed on the excavation bottom surface 5A as described above. However, the method is not limited to this process. No. In the retaining wall construction method, in the pre-process for forming the first embankment layer 5A, the assembly process of the support steel pipe 12, the connecting rod 13, and the first geotextile 14A described above is performed to form the first on the bottom surface 3A of the excavation part. Geotextile 14A may be laid. In the retaining wall construction method, in this case, the first geotextile 14 </ b> A is embedded in the lowermost layer of the embankment portion 5.

  In the retaining wall construction method, the lowermost first concrete panel 11A is combined between the adjacent H-shaped steels 10A and 10B through the above steps, and the first concrete panel 11A is formed on the bottom surface 3A of the excavated part. The firm first embankment layer 5A is soiled, and a lowermost layer portion in which the first geotextile 14A is laid is formed on the first embankment layer 5A. In the retaining wall construction method, the formation process of the second layer embankment layer 5B to the U layer embankment layer 5U is performed on the lowermost layer portion.

  In the retaining wall construction method, the step of forming the second layer portion includes the step of combining the second concrete panel 11B on the first concrete panel 11A between the adjacent H-shaped steels 10A and 10B, And a step of forming the second embankment layer 5B by rolling and compacting the earth and sand on the 1 embankment layer 5A. Further, in the retaining wall construction method, the second layer portion forming step includes a step of assembling the support steel pipe 12 and the connecting rod 13 between the adjacent H-shaped steels 10A and 10B, and the supporting steel pipe 12 and the connecting rod 13 And attaching the second geotextile 14B to the second embedding layer 5B by sliding the support steel pipe 12 downward along the H-shaped steels 10A and 10B.

  In the retaining wall construction method, the second geotextile 14B having a slightly larger length than the first concrete panel 11A is used, but the tip is laid close to the excavation inclined surface 3B. It is. In addition, each process of the formation process of a 2nd layer site | part is performed similarly to each process of the formation process of the lowest layer mentioned above.

  In the retaining wall construction method, each process equivalent to the process of forming the second layer portion described above is sequentially repeated so that the H-shaped steel 10 and the concrete panel 11 are used on the excavation portion 3 as shown in FIG. The earth retaining wall 4 is constructed to hold the embankment part 5 formed by laminating the first embankment layer 5A to the U-th embankment layer 5U and having a predetermined height. In the road construction work, the road 2 widened to the inclined surface 1 shown in FIG. 1 is applied to the embankment portion 5 formed by the above-described retaining wall construction method by raising the top and pavement. Finalize.

  By the way, in the retaining wall construction method, as the embankment layer is stacked and the embedding portion 5 becomes gradually higher, a gradually greater pressure is applied to the H-shaped steel 10 from the embedding portion 5 through the concrete panel 11. . In the retaining wall construction method, when each embankment layer 5A to 5U is formed as described above, one end side is fixed between the H-shaped steel 10 via the support steel pipe 12 and the connecting rod 13 on each surface each time. The H-shaped steel 10 is reinforced at a predetermined height by laying the geotextile 14 thus prepared.

  That is, in the retaining wall construction method, as described above, the geotextile 14 that is embedded at a predetermined height from the initial stage of the embankment construction is gradually loaded with a large pressure from the embedding portion 5 as the process proceeds. Reinforcement is performed by holding the shape steel 10 in the horizontal direction at multiple points in the height direction. Therefore, in the retaining wall construction method, stress displacement is applied to the H-shaped steel 10 at the time of construction or after completion as compared with the conventional method of reinforcing the H-shaped steel 10 with an anchor member or a retaining pile member. The strong earth retaining wall 4 is constructed by suppressing the occurrence of. Moreover, in the retaining wall construction method, the geotextile 14 of each layer reduces the pressure concentration from the embankment portion 5 on the H-shaped steel 10 and the concrete panel 11. In the retaining wall construction method, a stronger retaining wall 4 is thereby constructed.

  Further, in the earth retaining wall construction method, each geotextile 14 reinforces each H-shaped steel 10 from the formation of the lower layer portion of the embankment portion 5 even in a site where it is difficult to secure a sufficient ground pressure or soft ground. It is possible to construct a highly accurate and strong earth retaining wall 4 by suppressing the horizontal displacement and reducing the supporting force of each concrete panel 11 and the occurrence of settlement. The retaining wall construction method eliminates the need for new components and construction procedures, and can reduce the number of low-standard H-shaped steels 10 or H-shaped steels 10 by increasing the distance between them. To be.

  In the earth retaining wall construction method described above, each embankment layer is formed according to the height of each concrete panel 11, and the geotextile 14 is laid on these embankment layers. Not. In the retaining wall construction method, as the height of the embankment portion 5 increases, the pressure applied to the H-shaped steel 10 and the concrete panel 11 from the embankment portion 5 also decreases. Therefore, in the retaining wall construction method, the geotextile 14 is laid with a close interval in the lower layer region of the embankment portion 5 corresponding to the lower portion of the H-shaped steel 10 to which a greater pressure is applied, and becomes the upper portion. According to the above, the intervals may be coarsened and spread.

  In the above-described embodiment, the geotextile 14 of each layer is assembled to the support steel pipe 12 supported between the H-shaped steels 10 via the connecting rod 13, but the present invention is not limited to such a configuration. . The earth retaining wall 20 shown as the second embodiment in FIG. 9 is the earth retaining described in the basic construction method using the H-shaped steel 10 as the parent pile member to which the concrete panel 11 is assembled and the geotextile 14 as the reinforcing body. The same as the wall 4. The earth retaining wall 20 is attached to the front surface side of the H-shaped steel 10, that is, the front surface of the flange portion 16 </ b> F on the valley side by arranging a plurality of concrete panels 11 in a height direction via an appropriate mounting mechanism. The structure does not appear. In the earth retaining wall 20, a flat front surface is configured by abutting and combining the opposite end portions of the concrete panels 11 adjacent in the length direction on the front surface of the H-shaped steel 10.

  In the earth retaining wall 20, for example, at least a pair of attachment portions 21 </ b> A and 21 </ b> B for attaching the geotextile 14 is integrally formed on the back surface of the concrete panel 11 at both ends in the length direction. In the earth retaining wall 20, for example, the support steel pipe 12 is supported between the attachment portions 21 </ b> A and 21 </ b> B with respect to the concrete panel 11, and the geotextile 14 is attached to the support steel pipe 12 via the connecting rod 13.

  In the retaining wall construction method for constructing the retaining wall 20 configured as described above, a plurality of concrete panels 11 are arranged on the front surface of adjacent H-shaped steels 10A and 10B which are erected at a predetermined interval. Combined in direction. In the retaining wall construction method, the combination of the concrete panels 11 is performed in the pre-process for forming the embankment part 5, but the combination of the concrete panels 11 and the formation of the embankment layer are alternately performed in the same manner as the above-described construction method. Also good.

  In the earth retaining wall construction method, after forming the embankment layer of a predetermined height, the attaching step of the geotextile 14 to the concrete panel 11 is performed, and further, the geotextile 14 is laid on the embankment layer. In the retaining wall construction method, an upper embankment layer is formed on the geotextile 14, and the retaining wall 20 that holds the embankment part 5 having a predetermined height is constructed by sequentially repeating the same steps below. To do.

  In the retaining wall 25 shown as the third embodiment in FIG. 10, a steel pipe 26 is used instead of the H-shaped steel 10 described above as a parent pile member, and is integrally formed on the valley side outer surface of the steel pipe 26. A plurality of panels 28 are mounted side by side in the height direction via the mounting bracket portion 27 in the height direction so that the front surface is configured to be flat. Also in the retaining wall 25, as in the retaining wall 20 described above, for example, at least a pair of attachment portions 29 </ b> A and 29 </ b> B for attaching the geotextile 14 located on both ends in the length direction on the back surface of the panel 28 are integrally formed. Is formed. Also in the earth retaining wall 25, for example, the support steel pipe 12 is supported between the attachment portions 29 </ b> A and 29 </ b> B with respect to the panel 28, and the geotextile 14 is attached to the support steel pipe 12 via the connecting rod 13.

  In the retaining wall construction method for constructing the retaining wall 25 configured as described above, a plurality of mounting bracket portions 27A and 27B are provided on the front surfaces of adjacent steel pipes 26A and 26B which are erected at a predetermined interval. The panel 28 is combined in the height direction. Also in the earth retaining wall construction method, the combination of the panels 28 is performed in the previous step of forming the embankment portion 5, but the combination of the panels 28 and the formation of the embankment layer may be performed alternately as in the above-described construction method. . In the retaining wall construction method, after the embankment layer of a predetermined height is formed, the attachment step of the geotextile 14 is performed on the attachment portions 29A and 29B of the panel 28 via the support steel pipe 12 and the connecting rod 13, The geotextile 14 is laid on the embankment layer. In the retaining wall construction method, an upper embankment layer is formed on the geotextile 14, and the following steps are sequentially repeated to construct the retaining wall 25 that holds the embankment portion 5 having a predetermined height. To do.

  The earth retaining wall 30 shown as the fourth embodiment in FIG. 11 uses the H-shaped steel 10 described above as a parent pile member, and the panel 31 is arranged so that the H-shaped steel 10 is accommodated therein. Combined in the height direction. In the earth retaining wall 30, the panel 31 has a predetermined thickness and is formed to have a length slightly larger than the interval between the adjacent H-shaped steels 10A and 10B. The panel 31 is formed with assembly guide holes 32 </ b> A and 32 </ b> B in the height direction that penetrate the H-shaped steel 10 and are located in the vicinity of both ends in the length direction. The panel 31 is integrally formed with a fitting protrusion 33A in the height direction on one side surface in the length direction, and a fitting recess 33B in the height direction on the other side surface opposite to the panel 31. The panel 31 is integrally formed with at least a pair of attachment portions 34A and 34B for attaching the geotextile 14 located on both ends in the length direction on the back surface.

  As will be described later, panels 31A and 31B adjacent to each other in the length direction of the earth retaining wall 30 are combined with the H-shaped steel 10 by fitting the opposing fitting projections 33A and fitting fittings 33B. Also in the earth retaining wall 30, for example, the support steel pipe 12 is supported between the attachment portions 34 </ b> A and 34 </ b> B with respect to the panel 31, and the geotextile 14 is attached to the support steel pipe 12 via the connecting rod 13.

  In the retaining wall construction method for constructing the retaining wall 30 configured as described above, adjacent H-shaped steels 10A and 10B erected with a predetermined interval are passed through the assembly guide holes 32A and 32B. A plurality of panels 31 are combined in the height direction. Also in the retaining wall construction method, the combination of the panels 31 is performed in the previous step of forming the embankment portion 5, but the combination of the panels 31 and the formation of the embankment layer may be alternately performed in the same manner as the above-described construction method. . Also in the retaining wall construction method, after forming the embankment layer of a predetermined height, the attachment step of the geotextile 14 is performed on the attachment portions 34A and 34B of the panel 31 via the support steel pipe 12 and the connecting rod 13, The geotextile 14 is laid on the embankment layer. In the retaining wall construction method, an upper embankment layer is formed on the geotextile 14, and the following steps are sequentially repeated to construct the retaining wall 30 for retaining the embankment portion 5 having a predetermined height. To do.

  In each of the embodiments described above, the geotextile 14 is used as the reinforcing body, but the present invention is not limited to such a configuration. In the earth retaining wall 35 shown as the fifth embodiment in FIG. 12, as a reinforcing body, for example, a band-shaped reinforcing steel material 38A whose one end is integrated with mounting bracket members 37A and 37B fixed to a square steel pipe 36, for example. , 38B. The earth retaining wall 35 is formed such that the square steel pipe 36 has a length substantially equal to the interval between the H-shaped steels 10A and 10B, as shown in FIG. Mounting bracket members 37A and 37B for fixing the reinforcing steel members 38A and 38B, which are positioned at both ends in the length direction on the back side, are integrated with the square steel pipe 36 by welding or the like, as shown in FIG. Formed.

  Note that the mounting bracket members 37A and 37B are integrally formed on one end side of the reinforcing steel members 38A and 38B, respectively. In addition, the mounting bracket members 37A and 37B are integrated with the square steel pipe 36 by welding. However, for example, the mounting bracket members 37A and 37B may be integrally attached to the peak flange portion 16B of the H-shaped steels 10A and 10B. Such a structure may be formed on the back side of the concrete panel 11.

  In the retaining wall construction method for constructing the retaining wall 35 configured as described above, the plurality of concrete panels 11 are higher than the adjacent H-shaped steels 10A and 10B erected at a predetermined interval. Combined in direction. Also in the retaining wall construction method, the combination of the concrete panels 11 is performed in the previous process of forming the embankment part 5, but the combination of the concrete panels 11 and the formation of the embankment layer are alternately performed in the same manner as the above-described construction method. Also good. In the retaining wall construction method, a square steel pipe is supported between the H-shaped steels 10A and 10B, located on the back side of the concrete panel 11, after a bank layer of a predetermined height is formed. The square steel pipe 36 is integrally formed with reinforcing steel members 38A and 38B by welding bracket members 39A and 39B in advance. In the retaining wall construction method, the reinforcing steel materials 38A and 38B are laid on the embankment layer. In the retaining wall construction method, an upper embankment layer is formed on the reinforcing steel members 38A and 38B, and the following steps are repeated in order to keep the embankment part 5 having a predetermined height. Build 35.

  In addition, about a reinforcement body, you may make it use not only the strip | belt-shaped reinforcement steel material 38 mentioned above but general anchor members, such as a steel rod with an anchor plate currently used in the conventional retaining wall construction method, for example. . Further, the reinforcing material may be a plate-like member laid on the embankment layer in the same manner as the geotextile 14.

It is principal part sectional drawing which shows the outline | summary of the road widening construction along the inclined surface which employ | adopted the retaining wall construction method concerning this invention, and constructed the retaining wall. It is a principal part perspective view of the retaining wall constructed | assembled by the same retaining wall construction method. It is principal part sectional drawing of the inclined surface which performs widening construction. It is principal part sectional drawing of the state which struck H-shaped steel in the inclined surface which gave excavation. It is principal part sectional drawing of the state which combined the 1st concrete panel between the H-shaped steel standingly arranged along the earth retaining line. It is principal part sectional drawing in which the 1st embankment layer was formed on the bottom face of an excavation site | part. It is principal part sectional drawing of the state which laid down the 1st geotextile which fixed the end to the 1st concrete panel on the 1st embankment layer. It is principal part sectional drawing of the state which hold | maintained the embankment part which consists of a multi-layer embankment layer formed in the excavation site | part with the earth retaining wall. It is a principal part top view of the earth retaining wall shown as 2nd Embodiment. It is a principal part top view of the earth retaining wall shown as 3rd Embodiment. It is a principal part top view of the earth retaining wall shown as 4th Embodiment. It is the earth retaining wall shown as 5th Embodiment, The figure (A) is a principal part top view, The figure (B) is a principal part perspective view.

Explanation of symbols

  1 slope, 2 road, 3 excavation site, 3A bottom of excavation part, 3B excavation part slope, 4 earth retaining wall, 5 embankment part, 5A-5U embankment layer, 6 earth retaining line, 10 H section steel, 11 concrete panel, 12 Support steel pipe, 13 Connecting rod, 14 Geotextile, 15 Web, 16 Flange part, 17 Space part, 20 Earth retaining wall, 25 Earth retaining wall, 26 Steel pipe, 30 Earth retaining wall, 31 Panel, 32 Assembly guide hole, 33A Mating Convex part, 33B fitting concave part, 35 retaining wall, 36 square steel pipe, 37 mounting bracket member, 38 reinforcing steel material

Claims (6)

For the earth retaining wall constructed by combining a plurality of horizontal sheet piles in the height direction with each of the parent piles standing upright with a predetermined interval along the earth retaining line.
The embankment layer forming step of putting in sand, rolling and compacting so that the upper part of each side sheet pile is exposed, and the freedom of the reinforcing body with one end fixed to the back part of the side sheet pile or the parent pile Each of the parent piles is formed at a predetermined height by a multi-layered embankment layer by repeatedly applying a reinforcing body laying step of laying the end side on the bottom surface or the surface of the embankment layer formed by the embankment layer forming step. And the reinforcing body is embedded in multiple layers in the embankment portion held by the earth retaining wall constituted by each of the horizontal sheet piles,
Each of the parent piles is reinforced in multiple stages in the height direction by the reinforcing bodies laid when the embankment layer is laminated, thereby suppressing the occurrence of stress displacement against gradually increasing pressure. A retaining wall construction method characterized by that.   The earth retaining wall is composed of a parent pile made of H-shaped steel formed in an H-shaped cross section by connecting the opposing flange portions over the entire length with a web, and the flange portion and the web of the parent pile. The earth retaining wall construction method according to claim 1, wherein the earth retaining wall construction method is configured by a side sheet pile fitted with a side edge portion fitted to the space portion.   The said retaining wall is comprised from the parent pile which consists of a shape steel or a cylindrical steel pipe, and the cross-sheet pile which a side edge part is fixed to the front surface or back surface of this parent pile, and is combined. The retaining wall construction method described.   The earth retaining wall construction method according to claim 1, wherein the earth retaining wall is configured by passing the parent piles through a fitting portion in a height direction and combining the horizontal sheet piles.   The said reinforcement body is fixed to the back part of the said horizontal sheet pile or the said parent pile through the supporting member by which an edge part is combined with the said parent pile, The any one of Claim 1 thru | or 4 characterized by the above-mentioned. The retaining wall construction method described in 1.   The reinforcing body is embedded and embedded on the surface of the embankment layer formed by fixing the one end side to the back portion of the cross pile or the main pile and forming the free end side by the bottom surface or the embankment layer forming step. It is a geotextile, The earth retaining wall construction method of any one of Claim 1 thru | or 5 characterized by the above-mentioned.

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