JP2007162436A - Earth retaining wall method by integration of almost l type retaining wall with curved surface and basic pile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an earth retaining wall which balances a rotating force in an overturning direction by earth pressure against a back surface or the like with an almost L type retaining wall body having a curved surface and allows the almost L type retaining wall body (ashika wall) to be integrated with a basic pile and transmits only a horizontal force to the basic pile. <P>SOLUTION: The rotating force in the overturning direction of the earth pressure applied to the back surface is interfered with an overturning prevention directional force caused by earth pressure applied to the back surface and the weight of banking at the back surface applied to the curved surface and a bottom plate by a pillow-shaped beam conforming to the curved surface of the almost L type retaining wall body having the curved surface and the basic pile embedded in the pillow-shaped beam, and only the horizontal force caused by the earth pressure is transmitted to the basic pile and the support ground. The length of the bottom plate of a wall body is shortened by the method and sliding since the horizontal force is resisted by the basic pile. Pillow-shaped beam concrete integrated with the basic pile is driven by using the inner surface of a curved part of the almost L type wall body as a form, so that a structure in which a precast wall body, the pillow-shaped beam, and the basic pile are integrated is constructed. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The construction and construction method for the construction of the retaining wall for the cut slope and the embankment slope in road construction and the construction of the retaining wall for the slope in the residential land construction work are provided.

  Reinforced concrete retaining walls that resist the earth pressure acting on the back surface and the inertial force at the time of earthquake by the body weight and the back soil weight acting on the body bottom slab are represented by L-shaped retaining walls and have many construction examples. In addition, the precast retaining wall has only a method of complementing only the supporting force with the pile foundation, and there is no method for constructing a rational retaining wall structure integrated with the pile foundation.

The conventional techniques have the following problems.
(1) The L-shaped retaining wall has the disadvantage that the size of the bottom slab becomes longer and the amount of excavated soil on the back side increases due to the balance of force.
(2) Due to transportation restrictions, it was difficult to transport precast products with long bottom plate dimensions.
(3) There was no method to integrate the precast retaining wall and foundation pile.

  With a pillow-shaped beam that matches the curved surface of a substantially L-shaped retaining wall body (sea lion wall) having a curved surface, and a foundation pile embedded in the pillow-shaped beam, Then, the earth pressure acting on the back surface and the curved surface and the backfill weight acting on the bottom slab are caused to interfere, and only the horizontal force caused by the earth pressure is transmitted to the foundation pile and the supporting ground. Thus, by the method of separating and stabilizing the rotational force and the horizontal force, the bottom plate length of the wall body can be shortened, and the sliding due to the horizontal force can be resisted by the foundation pile. In addition, since the inner surface of the curved part of the L-shaped wall body is also used as a formwork and the pillow-shaped beam concrete with the foundation pile integrated is placed, the structure in which the precast wall body, the pillow-shaped beam and the foundation pile are integrated. It becomes possible to construct.

By using the present invention, the following effects can be obtained.
(1) Since the length of the bottom plate portion of the wall body is shortened, the amount of excavation on the back surface is reduced.
(2) In the case of a precast product, the range of the retaining wall height that can be transported within the transport limit is widened.
(3) Integration of precast products and foundation piles is possible.

  The foundation pile (8) is placed on the support ground (16), and the crushed stone foundation (10) and the leveled concrete (9) are constructed. After assembling the rebar (7) of the pillow beam and installing the installation support (11), the sea lion wall is installed at a predetermined position. The front formwork (12) was installed, and the inside of the curved wall (3) of the sea lion wall (1) was also used as the formwork, and the concrete was placed from the concrete placement opening (13), and integrated with the foundation pile. Build a pillow beam. Naturally, the convex curved surface of the pillow-shaped beam (6) and the concave curved surface of the sea lion wall (1) are matched and integrated. When the backfill (17) is constructed on the back of the sea lion wall, the earth wall pressure (14) acts on the vertical wall (2) with the rotation center (5) as a fulcrum, and at the same time, the curved wall (3) and the bottom plate (4) The anti-rotation direction earth pressure (15) acts on. Further, a force in the rotation preventing direction acts on the curved wall (3) and the bottom plate (4) due to the weight of the back embankment (17). Eventually, when the rotational forces interfere with each other, a horizontal force due to earth pressure acts on the foundation pile, and the force is transmitted from the foundation pile to the support ground (16).

Standard cross section when sea lion wall is completed Cross section of foundation construction stage Cross section of reinforcing bar arrangement of pillow beam Askai all and formwork assembly drawing just before cockleet of pillow beam

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Sea lion wall 2 Vertical wall 3 Curved wall 4 Bottom plate 5 Rotation center 6 Pillow beam 7 Pillar beam reinforcement 8 Foundation pile 9 Leveling concrete 10 Crushed stone 11 Installation support 12 Front formwork 13 Concrete placement port 14 Rotation direction Earth pressure 15 Anti-rotation direction earth pressure 16 Support ground 17 Back embankment

Claims (2)

  A retaining wall composed of a rectangular surface or a curved surface in which a joint portion between a vertical wall lower portion and a bottom plate front portion of a substantially L-shaped retaining wall is convex in a vertical wall back direction and a bottom plate upper direction; A soil retaining structure in which a pillow-shaped beam having a shape matching a curved surface and a foundation pile having a head embedded in the pillow-shaped beam are combined together.   By a retaining wall composed of a rectangular surface or curved surface in which the joint between the lower part of the vertical wall and the front part of the bottom plate is convex in the back direction of the vertical wall and the upward direction of the bottom plate, and using the top part of the pillow beam as a fulcrum , Due to the falling moment due to earth pressure acting on the vertical wall above the fulcrum, the resistance moment due to earth pressure and earth weight acting on the vertical wall and rectangular surface or curved surface below the fulcrum, and the earth weight acting on the bottom slab A method in which the resistance moment is caused to interfere, and as a result, horizontal and vertical forces are transmitted to the foundation through the pillow beam and further supported on the support ground through the foundation pile.

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