JP5263897B2 - Yamatome and Yamatome construction method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide earth retaining which can securely obtain a reaction force of a strut without negotiation with an owner of an adjacent land even for the inclined ground. <P>SOLUTION: The earth retaining 1 is used for constructing a building on a site 10. The earth retaining 1 includes a first earth retaining wall 21 constructed at the mountain side of the site 10, a receiving part 40 provided on a floor surface 11 and fixed to pile heads of a plurality of piles 30A for a building, and a strut 52 bridged between the receiving part 40 and the first earth retaining wall 21. A frictional force between the receiving part 40 and the floor surface 11 and the shearing force of each pile 30A resist against a horizontal force working on the receiving part 40. Then, the horizontal load borne by each pile 30A can be reduced while dispensing with an anchor, so that the reaction force of the strut 52 can be securely obtained without negotiation with an owner of an adjacent land. Furthermore, the horizontal forces working on the pile heads of the piles 30A can be reduced to prevent the piles from being broken. <P>COPYRIGHT: (C)2011,JPO&amp;INPIT

Description

  The present invention relates to a yamadome and a yamadome construction method. More specifically, the present invention relates to a mountain tower for building a structure on an inclined land and a mountain building construction method.

  Conventionally, in order to construct a skeleton in the basement, there is a case where a mountain stop is provided. This mountain stop includes a mountain retaining wall constructed in a frame shape surrounding the position of the underground frame, and a supporting work spanned between the opposing portions of the mountain retaining wall. Since the earth and sand on the back acts as a lateral pressure on the retaining wall, reaction forces are taken by the retaining walls facing each other through this support.

  By the way, there are cases where the site is sloped and a mountain retaining wall is provided only on the mountain side of the site. In this case, since there is no mountain retaining wall on the valley side, the reaction force of the mountain retaining wall may not be taken.

Therefore, the earth anchor method and the island method are known.
The earth anchor construction method is a construction method in which an earth anchor is driven toward the ground on the back side of the mountain retaining wall and a reaction force is taken from the ground. On the other hand, the island construction method is a construction method in which a part of the building is constructed in the center of the site in advance, and a support work is constructed between the constructed building and the mountain retaining wall.

However, the earth anchor method may not be able to be carried out because it requires permission to drive the anchor to the owner of the adjacent land on the site.
In addition, the island method has a problem that since a part of the frame is constructed in advance, it takes time to construct the support work and the construction period becomes long.

  In order to solve the above problems, one support pile provided at the root of the root, a receiving foundation provided at the pile head of the supporting pile, and a drive from the receiving foundation toward the back of the mountain retaining wall. There has been proposed a mountain retaining structure including a ground anchor and a cutting beam constructed between a receiving foundation and a mountain retaining wall (see Patent Document 1).

JP-A-7-252835

However, in the mountain retaining structure shown in Patent Document 1, it is actually difficult to keep the anchor anchor length within the site, so it is still necessary to negotiate with the owner of the adjacent land to obtain permission. there were.
In addition, since the receiving foundation is supported by one pile, the horizontal load borne by the pile is increased, and it may be difficult to take the reaction force of the cut beam.

  An object of the present invention is to provide a mountain retaining and a method for constructing a mountain retaining that can reliably take a reaction force of a beam without negotiating with an owner of an adjacent land even on an inclined land.

The mountain stay according to claim 1 is a mountain stay for constructing a structure, comprising a mountain retaining wall constructed on a mountain side of a site, and a plurality of piles of the structure provided on a floor surface. A receiving portion fixed to the pile head, and a cut beam erected between the receiving portion and the mountain retaining wall, the receiving portion being unreasonably discarded fixed to the plurality of pile heads It is characterized by comprising a base made of concrete and a receiving beam made of reinforced concrete provided integrally with the base and connected to the cut beam.

The mountain retaining wall is constructed by, for example, a parent pile sheet pile method, a sheet pile method, or an SMW method.
According to the present invention, the mountain tower is constructed between the mountain retaining wall, the floor-attached surface, the receiving part fixed to the pile heads of the plurality of piles, and the receiving part and the mountain retaining wall. Consists of cut beams. Therefore, it resists with the frictional force of a receiving part and a floor surface and the shear force of each pile with respect to the horizontal force which acts on a receiving part. Therefore, since the horizontal load which each pile bears can be made small, an anchor becomes unnecessary and the reaction force of a cut beam can be taken reliably, without negotiating with the owner of an adjacent land. Moreover, since the horizontal force which acts on the pile head of each pile becomes small, it can prevent that a pile is damaged.

  According to a second aspect of the present invention, an existing structure is constructed on the sloped land, and the receiving portion includes a pile head of a pile of the existing structure in addition to a pile head of the pile of the structure. It is also characterized by being firmly attached to.

  According to this invention, in addition to the pile head of the pile of a new structure, the receiving part was also fixed to the pile head of the pile of the existing structure. In this way, the horizontal force applied to the piles of the new structure can be further reduced by applying the horizontal force to the piles of the existing structure, so the piles of the new structure have a large diameter to support the mountain retaining wall. The construction cost can be reduced.

  According to the present invention, the receiving portion is provided with a base portion made of unreinforced concrete fixed to the pile head and a receiving beam made of reinforced concrete that is provided integrally with the base portion and connected to the cut beam. Therefore, unlike conventional receiving foundations, most of the receiving part can be made of unreinforced concrete, and it is easy to construct and greatly shortens the time required to support the retaining wall with a cut beam. it can.

A method for constructing a mountain retaining structure according to claim 3 is a method for constructing a mountain retaining structure for constructing a structure, the step of constructing a retaining wall on a mountain side of a site, and a pile of the structure A plurality of steps, excavating a part of the site to a floored surface, exposing the pile heads of the plurality of piles, and cutting beams from the retaining wall toward the exposed pile heads A step of constructing a receiving portion provided with a base portion made of unreinforced discarded concrete that is arranged and fixed to the plurality of pile heads, and a receiving beam that is integrally provided on the base portion and fixed to the cut beam. And.

  According to the present invention, the mountain tower is constructed between the mountain retaining wall, the flooring surface, the receiving part fixed to the pile heads of the plurality of piles, and the receiving part and the mountain retaining wall. Consists of cut beams. The horizontal force acting on the receiving part is resisted by the frictional force between the receiving part and the floor surface and the shearing force of each pile. Therefore, since the horizontal load which each pile bears can be made small, an anchor becomes unnecessary and the reaction force of a cut beam can be taken reliably, without negotiating with the owner of an adjacent land. Moreover, since the horizontal force which acts on the pile head of each pile becomes small, it can prevent that a pile is damaged.

It is sectional drawing which shows the site where the mountain stop concerning one Embodiment of this invention was applied. It is a partial top view of the site concerning the embodiment. It is a fragmentary sectional view of the receiving part of the mountain stop concerning the embodiment. It is sectional drawing and a top view of the lower end part of the cut beam of the mountain stop concerning the embodiment.

FIG. 1 is a cross-sectional view of a site 10 to which a mountain stay 1 according to an embodiment of the present invention is applied. FIG. 2 is a plan view of a part of the site 10.
The site 10 is an inclined land, and a plurality of building piles 30 as newly constructed structures are constructed on the site 10. The pile 30A is located near the center of the building. The pile 30 reaches the support layer. Moreover, the part shown with the broken line in FIG. 1 is the foundation of a building.
The site 10 is provided with a Yamato 1 for constructing a building. The mountain stay 1 includes a mountain retaining wall 20 constructed along the periphery of the site 10, a receiving portion 40 provided on the floored surface 11 and fixed to the pile heads of a plurality of piles 30A, and the receiving portion 40. And a support work 50 installed between the upper part of the mountain retaining wall 20.

  The mountain retaining wall 20 is constructed by the parent pile side sheet pile method. The mountain retaining wall 20 includes a first mountain retaining wall 21 constructed on the mountain side of the site 10 and a second mountain retaining wall 22 constructed on the valley side of the site 10. Since the site 10 is inclined, the second mountain retaining wall 22 is lower than the first mountain retaining wall 21. Therefore, it is difficult to take the reaction force of the first mountain retaining wall 21 from the second mountain retaining wall 22.

The support 50 is provided on the upper portion of the first mountain retaining wall 21 and extends substantially horizontally, and a cut beam 52 extends downward from the erection 51 toward the receiving beam 42 of the receiving portion 40. .
The upper end portion of the cut beam 52 is pin-joined to the flank 51.

FIG. 3 is a partial cross-sectional view of the receiving portion 40.
The receiving portion 40 is provided integrally with a base portion 41 made of flat unreinforced concrete having a thickness of about 50 cm fixed integrally with the pile 30 and an end portion of the base portion 41 on the first mountain retaining wall 21 side. Receiving beam 42 made of reinforced concrete. Specifically, the base 41 is abandoned concrete. A lower end portion of the cut beam 52 on the receiving beam 42 side is embedded in the receiving beam 42.

FIG. 4 is a cross-sectional view and a plan view of the lower end portion of the cut beam 52.
The beam 52 includes a main body 521 made of H steel, an end plate 522 joined to the lower end of the main body, a rib plate 523 joined to the web of the main body 521 and the end plate 522, and a flange of the main body 521. And a joining plate 524 joined to the end plate 522.

  As shown in FIG. 1, the angle of the cut beam 52 is about 30 ° with respect to the horizontal plane, and is smaller than the angle of the cut beam used in the conventional island method or the method using the receiving foundation.

  As described above, since the angle of the cut beam 52 with respect to the horizontal plane is small, the cut beam 52 reduces the vertical force and bending moment acting on the receiving portion 40 and mainly transmits the horizontal force to the receiving portion 40. As a result, it is possible to reduce the cross-sectional area of the receiving portion 40 to suppress the thickness, and to make the base portion 41 a plain and flat concrete body.

  In this hill 1, the lateral pressure acting on the first hill wall 21 is transmitted to the receiving beam 42 of the receiving portion 40 via the cutting beam 52. The horizontal force transmitted to the receiving beam 42 is transmitted to the pile 30 via the base 41. At this time, the horizontal force is resisted by the frictional force between the receiving beam 42 and the floor surface 11 and the shearing force of each pile 30.

Further, the above-mentioned Yamadome 1 is constructed by the following procedure.
First, the first mountain retaining wall 21 is constructed on the mountain side of the site 10 and the building pile 30 is constructed. Next, a part of the site 10 is excavated to the floored surface 11 to expose at least the pile head of the pile 30A. Next, an erection 51 is provided on the upper portion of the first mountain retaining wall 21, and a cut beam 52 is disposed toward the pile head of the pile 30 </ b> A exposed from the erection 51 and exposed on the floored surface 11. The receiving part 40 fixed to the pile head and the cut beam 52 is constructed. In this way, the cut beam 52 is installed between the receiving portion 40 and the first mountain retaining wall 21.

According to this embodiment, there are the following effects.
(1) The first retaining wall 21 is provided on the first retaining wall 21, the floored surface 11, and fixed to the pile heads of the plurality of piles 30A, and the receiving part 40 and the first retaining wall. 21 includes a cutting beam 52 erected between the two. Therefore, it resists with respect to the horizontal force which acts on the receiving part 40 with the frictional force of the receiving part 40 and the floor surface 11 and the shear force of each pile 30A. Therefore, since the horizontal load which each pile 30A bears can be made small, an anchor becomes unnecessary and the reaction force of the cut beam 52 can be taken reliably, without negotiating with the owner of an adjacent land. Moreover, since the horizontal force which acts on the pile head of each pile 30A becomes small, it can prevent the pile 30A being damaged.

  (2) A base 41 made of unreinforced concrete fixed to the pile head of the pile 30 </ b> A on the receiving portion 40, and a receiving beam 42 made of reinforced concrete provided integrally with the base 41 and fixed to the cut beam 52. , Provided. Therefore, unlike the conventional receiving foundation, most of the receiving portion 40 can be formed from unreinforced concrete discarded concrete, so that the construction is easy and the first retaining wall 21 is supported by the cut beam 52. The period can be greatly shortened.

  It should be noted that the present invention is not limited to the above-described embodiment, and modifications, improvements, etc. within a scope that can achieve the object of the present invention are included in the present invention.

For example, in this embodiment, although the receiving part 40 was fixed to the pile head of the pile 30A of a new building, it is not restricted to this. That is, in addition to the pile head of the building pile, the pile head of the remaining pile in the existing building may be fixed. In this way, the following effects are obtained.
(3) In addition to the pile heads of the piles of the new building, the receiving part was also fixed to the pile heads of the existing building piles. In this way, the horizontal force applied to the piles of the new building can be further reduced by applying the horizontal force to the piles of the existing building. Therefore, the piles of the new building can be increased to support the first mountain retaining wall on the mountain side. There is no need for diameter reduction, and construction costs can be reduced.

  Further, in the present embodiment, the present invention is applied to an inclined land where the heights of the mountain walls facing each other are different. it can.

DESCRIPTION OF SYMBOLS 1 ... Yamato 10 ... Site 11 ... Floor surface 20 ... Yamato wall 21 ... 1st mountain retaining wall 22 ... 2nd mountain retaining wall 30, 30A ... Pile 40 ... Receiving part 41 ... Base 42 ... Receiving beam 50 ... Support Work 51 ... Raised 52 ... Cut beam

Claims (3)

Yamatome to build a structure,
A mountain wall built on the mountain side of the site,
A receiving portion provided on a floor surface and fixed to a pile head of a plurality of piles of the structure;
A beam constructed between the receiving portion and the mountain retaining wall ,
The receiving portion includes a base portion made of unreinforced concrete fixed to the plurality of pile heads, and a receiving beam made of reinforced concrete provided integrally with the base portion and connected to the cut beam. Yamatome characterized by. An existing structure is constructed on the site,
The pile according to claim 1, wherein the receiving portion is fixed to a pile head of the pile of the existing structure in addition to a pile head of the pile of the structure. A mountain construction method for constructing a mountain for constructing a structure,
The process of building a mountain wall on the mountain side of the site;
Building a plurality of piles of the structure;
Excavating a part of the site to a floored surface, exposing the pile heads of the plurality of piles;
A base beam made of unreinforced concrete that is disposed on the pile wall from the pile wall toward the exposed pile head and fixed to the plurality of pile heads, and is integrally provided on the base portion. A mountain construction method comprising: a receiving beam made of reinforced concrete to be fixed; and a step of constructing a receiving portion to be provided.

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