JP5309378B2 - Self-supporting retaining wall - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a self-supporting earth retaining wall with sufficient strength, which reduces weight. <P>SOLUTION: This self-supporting earth retaining wall comprises: a plurality of steel pipe piles which penetrate low land surface-side ground in a colonnade manner in an earth retaining area of a slope face positioned between lower and high land surfaces; wall surface forming reinforcements which are arranged in a grid pattern along the steel pipe piles in such a manner as to sandwich the steel pipe piles in between; and concrete which is infilled to embed the wall surface forming reinforcements. The self-supporting earth retaining wall also comprises an anchor portion which is buried in the low land surface side ground, and a wall portion which is erected almost to a position of the high land surface from the anchor portion. The steel pipe pile is elongated at a predetermined ratio in the wall surface forming reinforcement. <P>COPYRIGHT: (C)2009,JPO&amp;INPIT

Description

  The present invention relates to a self-supporting earth retaining wall that prevents outflow of earth and sand or collapse of a cliff slope on a side surface of a road, an established land, or a slope such as a mountain surface.

  Patent Document 1 discloses a standing part positioned at the end of the earth retaining part, and is provided perpendicular to the lower end of the standing part and embedded under the earth and sand to receive the weight of the earth and sand in a horizontal plane, and the standing part rolls or slides. An L-shaped retaining wall block main body having an L-shaped cross section having a counterweight action for preventing the bottom plate and the fixed end, and spaced apart from the fixed plate by a dimensional position longer than the outermost end position of the bottom plate, the longitudinal direction of the upright portion An anchor block embedded in the earth and sand column in a horizontal posture along the arrangement direction, and a linear binding material that joins the anchor block and the fixed end to each other in a tensioned and loose state, and L-type retaining wall block and anchor block in which the resultant force of earth pressure and other forces applied to the part is stopped by the resultant force of the counterweight action of the bottom plate and the anchor action of the anchor block Providing earth retaining structure.

  In Patent Document 2, a plurality of support piles are suspended at a predetermined interval on the ground, a part of the concrete panel is formed into a thick part, a support hole facing in the vertical direction is formed in that part, and the support hole is defined as predetermined By inserting the concrete panels into the support piles suspended at intervals and supporting the concrete panels by a predetermined height, in the retaining wall integrally formed with the support piles, the meat of the concrete panel loaded on the top stage The thick part is formed shorter than the end of the concrete panel, and the upper ends of a plurality of support piles that are inserted and protruded through the support hole are connected by a horizontal suspension member to reinforce the upper part of the laminated retaining wall. Is disclosed.

  Patent Document 3 describes an improved pile in which a mountain retaining wall that supports the end of the embankment part is constructed on a ground below a position where the mountain retaining wall is to be constructed at a predetermined interval, and each of the improved piles It is constructed on the valley side of the support column using a reinforcing steel material that is embedded and fixed, a supporting column made of reinforced concrete with the reinforcing steel material as a core, and a reinforcing bar that is combined with a reinforcing bar that is arranged on the supporting column. It discloses that it is comprised from a concrete retaining wall.

Patent document 4 is based on the applicant of the present invention, and a plurality of steel pipe piles whose bases are government-owned in the soil and fixed to the foundation are arranged on the side, and desired on one side and the other side of the plurality of steel pipe piles. A self-supporting retaining wall in which a concrete wall extending laterally by filling concrete with a steel pipe pile is disclosed.
JP 2003-74073 A JP 2001-31168 A JP 2000-257088 A Utility Model Registration No. 3113018

  The L-type retaining wall block disclosed in Patent Document 1 prevents the rolling or sliding of the upright portion by the counterweight action due to the weight of the earth and sand by backfilling the earth and sand on the bottom side. Is very loose compared to the ground before digging, especially the conventional ground near the backfill, and there is a concern that the ground strength will be insufficient and cause a subsidence accident. Therefore, it is known that the backfill portion is preferably as small as possible.

  Moreover, the retaining wall disclosed in Patent Document 2 is inserted through the entire support hole formed in the thick part of the plurality of panel plates on which the steel pipe piles are stacked. Similarly, also in the retaining wall disclosed in Patent Document 3, the reinforcing steel material of the concrete retaining wall is inserted over the entire height of the concrete retaining wall. This is because a sufficient amount of steel pipe piles need to be buried in the soil in order to have sufficient load resistance, so there is an emergency depending on the portion buried in the soil and the portion buried in the retaining wall. However, there is a problem that a long steel pipe pile is required. Similarly, in the self-supporting retaining wall of Patent Document 4 by the present applicant, it is necessary to increase the length of the steel pipe pile when retaining the soil to a very high position. Moreover, when a steel pipe pile etc. are extended to the upper part, the wall thickness of a self-supporting earth retaining wall becomes large, and the malfunction that the overturning moment by the load of self-supporting earth retaining wall itself will work also arises.

  For this reason, this invention is providing the self-supporting earth retaining wall which aimed at weight reduction while maintaining sufficient intensity | strength.

  Therefore, the present invention provides a plurality of steel pipe piles that are columnarly inserted into the low ground surface ground with respect to the earth retaining region of the slope located between the low ground surface and the high ground surface, and the steel pipe so as to sandwich the steel pipe pile. An anchor embedded in the low ground surface side ground in a self-supporting earth retaining wall composed of wall-forming reinforcing bars arranged in a grid along the pile and concrete filled so as to bury the wall-forming reinforcing bars And a wall portion standing from the anchor portion to substantially the high ground surface position, and the steel pipe pile extends in the wall forming reinforcing bar at a predetermined rate.

  Moreover, it is desirable that the wall portion gradually decrease the wall thickness along the height direction from the anchor portion.

Further, the embedded portion of the steel pipe pile below the low ground surface is within a range of 0.1 to 0.3, particularly 0.2 with respect to the wall height above the low ground surface of the wall portion, and the steel pipe pile portion extending up from the lowland surface is in the range of 0.3 from 0 to 0.50 with respect to the wall height, and it is particularly desirable that 0.35.

Furthermore, it is desirable that the steel pipe pile is buried by rotational penetration. Moreover, it is desirable that an auxiliary steel pipe pile is provided on the anchor portion so as to form a staggered pattern with the steel pipe pile.

  According to the present invention, since the embedment length of the steel pipe pile placed on the self-supporting retaining wall is reduced, the weight of the self-supporting retaining wall itself can be reduced, and the thickness of the wall surface can be reduced. Therefore, further weight reduction can be achieved. Further, along with this, the amount of concrete can be reduced, so that the economic efficiency can be improved.

  Embodiments of the present invention will be described below with reference to the drawings.

  As shown in FIG. 1 and FIG. 2, the self-supporting retaining wall 1 according to the first embodiment of the present invention is formed on the base 4 of the inclined surface 3 of the natural ground 2 between the low ground surface 10 and the high ground surface 11. A plurality of steel pipe piles 5 penetrating in a columnar manner along the inclined surface 3 and a latticed wall-formed reinforcing bar 6 arranged along these steel pipe piles 5 so as to sandwich these steel pipe piles 5 (6A, 6B) and concrete 7 filled so as to embed the wall-forming reinforcing bars 6 therein.

  In the self-supporting retaining wall 1, the steel pipe pile 5 is penetrated into the ground from the base portion 4 leaving a predetermined length so as to extend a predetermined length from below the self-supporting retaining wall 1. . As a result, the lower portion of the wall-forming bar 6 is joined to the protruding portion of the steel pipe pile 5 within a predetermined range.

  The length in which the steel pipe pile 5 is embedded in the self-supporting retaining wall 1 is determined by the portion HL embedded below the low surface 10 and the portion HU extending upward from the low surface 10. Furthermore, the embedded part of the retaining wall 1 according to the first embodiment is formed to have a width and thickness to form the anchor portion 7B. Accordingly, the self-supporting retaining wall 1 is constituted by the wall portion 7A and the anchor portion 7B.

  As described above, the above-mentioned self-supporting retaining wall 1 has a plurality of steel pipe piles 5 penetrating into the base part 4 along the slope 3 in such a manner that the steel bars 5 are sandwiched between the steel pipe piles 5. Arrangement is made to form a lattice-like wall-forming reinforcing bar 6, and the mold is removed from both sides of the wall-forming reinforcing bar 6 and filled with concrete, and the mold is removed after a predetermined curing period. Thereafter, the space between the self-supporting retaining wall 1 and the slope is backfilled to form a backfill portion 8 and further a backfill portion 9 to complete the construction. In addition, as said penetration method, there exist methods, such as placement penetration and rotation penetration, but rotation penetration is especially desirable.

  The burying amount HL below the low-pitch surface 10 of the steel pipe pile 5 is a ratio of 0.1 to 0.3 of the height H from the low-pitch surface 10 of the wall portion 7A of the self-supporting retaining wall 1, particularly 0. .2. The length HU extending upward from the low ground surface 10 of the steel pipe pile 5 is in the range of 0.3 to 0.5 of the height H of the wall portion 7A, particularly 0.35. This is obtained from the balance between the weight of the self-supporting retaining wall and the overturning moment of the self-supporting retaining wall, and the numerical value is obtained by experiment. Thereby, weight reduction can be achieved while ensuring the strength of the self-supporting retaining wall 1.

  The self-supporting retaining wall 1 according to the second embodiment of the present invention is formed in the same manner as the self-supporting retaining wall 1 according to the first embodiment. The feature of the self-supporting retaining wall 1 according to the second embodiment is that the anchor portion 7B is formed with a predetermined wall thickness to the extending position of the steel pipe pile 5, and the wall portion 7A of the self-supporting retaining wall 1 is provided. The inclined side surface 7C is formed so as to be inclined so that the wall thickness of the self-supporting retaining wall 1 gradually decreases upward from the anchor portion 7B. Accordingly, along with this, the internal slope-side reinforcing bar 6B is arranged to be inclined with respect to the front-side reinforcing bar 6A.

  As a result, the wall width becomes narrower toward the upper side of the self-supporting retaining wall 1, and the weight of the self-supporting retaining wall 1 can be further reduced. In the second embodiment, the same portions as those in the first embodiment and the portions having the same effects are denoted by the same reference numerals, and the description thereof is omitted.

  The self-supporting retaining wall 1 according to the third embodiment of the present invention is formed in the same manner as in the first and second embodiments, but as shown in FIG. However, it is formed to be inclined so that the wall thickness gradually decreases from the base portion 4 side.

  Therefore, in this Example 3, the weight of the self-supporting retaining wall 1 can be further reduced. In the third embodiment, the same portions as those in the first and second embodiments and the portions having the same effects are denoted by the same reference numerals, and the description thereof is omitted.

  Moreover, as for the lower end width B0 of the anchor part 7B of the self-supporting earth retaining wall 1 which concerns on Example 3, it is desirable to set with B0> = pile diameter + rebar diameter x2 + 60mm + 80mm. 60 mm is the outer concrete cover thickness, and 80 mm is the inner concrete cover thickness.

  As shown in FIGS. 5 and 6, the self-supporting retaining wall 1 according to the fourth embodiment of the present invention is changed to have a larger width of the anchor portion 7 </ b> B of the self-supporting retaining wall described in the third embodiment. In addition, the anchor portion 7B is provided with the steel pipe pile 5 and an auxiliary steel pipe pile 5A in a staggered manner.

  Thereby, in this Example 4, since the weight of the wall part 7A of the self-supporting earth retaining wall 1 can be reduced and the weight of the anchor part 7B can be increased, the stability of the self-supporting earth retaining wall 1 is improved. It is something that can be done. In the fourth embodiment, the same portions as those of the first, second, or third embodiment and the portions having the same effects are denoted by the same reference numerals and the description thereof is omitted.

1 is a schematic side sectional view showing a configuration of a self-supporting retaining wall according to Example 1 of the present invention. It is the schematic explanatory drawing which showed the structure of the self-supporting earth retaining wall which concerns on Example 1 of this invention. It is the schematic side sectional drawing which showed the structure of the self-supporting earth retaining wall which concerns on Example 2 of this invention. It is the schematic side sectional drawing which showed the structure of the self-supporting earth retaining wall which concerns on Example 3 of this invention. It is the schematic side sectional drawing which showed the structure of the self-supporting earth retaining wall which concerns on Example 4 of this invention. It is explanatory drawing explaining arrangement | positioning of the steel pipe pile of the self-supporting earth retaining wall which concerns on Example 4. FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Self-supporting retaining wall 2 Ground mountain 3 Inclined surface 4 Base part 5 Steel pipe pile 6 Wall-forming reinforcement 7 Concrete 8,9 Backfill part 10 Low ground surface 11 High ground surface

Claims (4)

A plurality of steel pipe piles penetrating into the low ground surface side ground with respect to the earth retaining region of the slope located between the low ground surface and the high ground surface, and a grid along the steel pipe pile so as to sandwich the steel pipe pile In a self-supporting earth retaining wall composed of wall-formed reinforcing bars arranged in a shape and concrete filled so as to bury the wall-forming reinforcing bars,
It is constituted by an anchor part embedded in the low ground surface side ground, and a wall part standing from the anchor part to the high ground surface position.
Said steel pipe piles, said to extend in a predetermined ratio to the wall forming the reinforcement, the lower portions of the wall forming reinforcement is joined in a predetermined range, and,
The amount of burial from the low ground surface of the steel pipe pile is within a range of 0.1 to 0.3 with respect to the wall height above the low ground surface of the wall, and extends upward from the low ground surface of the steel pipe pile. The self-supporting earth retaining wall is characterized in that the length of the wall is 0.3 to 0.5 with respect to the wall height.   The self-supporting retaining wall according to claim 1, wherein the wall portion gradually decreases the wall thickness along the height direction from the anchor portion.   The self-supporting retaining wall according to claim 1 or 2, wherein the steel pipe pile is rotationally inserted.   The self-supporting earth retaining wall according to any one of claims 1 to 3, wherein an auxiliary steel pipe pile is provided in the anchor portion so as to form a staggered pattern with the steel pipe pile.

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