JPH10183651A - Construction method for structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a construction method capable of shortening the construction time period and reducing the cost by effectively utilizing a core material inside an earth-retaining wall as a bearing material for an above-ground structure. SOLUTION: A basement structure is constructed by a reverse pouring method, during which the inner side of an earth retaining wall 4 built in ground 2 is excavated. A core material 28 placed in the earth retaining wall 4 in vertical direction is exposed to the outside of the wall 4 because the wall surface of the earth retaining wall 4 exposed by the excavation is cut off. The exposed surface of the core material 28 is secured with stud connectors 30 in one united body. The stud connector 30 transmits a vertical load to the core material 28 which is given from above-ground structure to an outer peripheral column 42 built above in one united body.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for constructing a structure in which an underground structure is constructed inside a retaining wall by a back-inside construction method and an above-ground structure is constructed above the underground structure. is there.

[0002]

2. Description of the Related Art When constructing both an underground structure and an above-ground structure such as a high-rise building having an underground floor, in general, an earth retaining wall is constructed in the ground and then the inside of the earth retaining wall is excavated. In addition to constructing an underground structure in a space formed by excavation, an above-ground structure is constructed on the underground structure. As a method of constructing the underground structure, there is a reverse striking method in which the underground structure is sequentially constructed from the upper layer side according to each stage while the inside of the retaining wall is excavated stepwise. The reverse striking method is generally well known as a method of starting construction of an above-ground structure before completing construction of an underground structure.

FIGS. 9 (a) to 9 (d) show an example of a case where a structure is constructed by a reverse striking method. FIG.
As shown in (a), first, the earth retaining wall 4 is constructed in the ground 2, and in the ground 2 inside the earth retaining wall 4, corresponding to the column positions of the above-ground structure and the underground structure, A back-stake pile 6 is cast from cast-in-place concrete, and a back-stake support 8 is provided above the pile. Next, as shown in FIG. 9 (b), the area surrounded by the retaining wall 4 is excavated to a predetermined depth, and in the space formed by the excavation, the counter strut 8 is integrated with the first floor above the ground. The floor / beam 10 of the section is constructed. Then, FIG. 9 (c)
As shown in the figure, excavation is performed to a deeper position, and in the same manner as above,
The beam 10 and the underground pillar 12 are constructed. On the other hand, above the underground structure, the column member 14 is erected above the undercut support column 8 while being supported by the upper end thereof, and the frame 16 is started to be constructed.
Then, while the excavation is further advanced, the underground structure is successively constructed in the lower part, and finally, as shown in FIG.
To complete the construction of the underground structure. On the other hand, for underground structures, construction of underground structures can be continued one after another,
The construction of the underground structure can be advanced without being greatly influenced by the progress of the construction.

[0004]

The earth retaining wall constructed when constructing an underground structure is constructed for the purpose of preventing the collapse of the ground and the leakage of groundwater. The core material such as H-section steel, which is disposed along the vertical direction in the inside of the ground, causes the retaining wall to generate lateral pressure such as earth pressure and water pressure received from the ground, and also occurs on the retaining wall when excavating. It was provided for the purpose of reinforcing the retaining wall so as to be able to resist horizontal forces such as bending stress and shear stress. In other words, the core material is made of steel, etc., and although it has sufficient strength, it is used only as a reinforcing material that only counters horizontal force, and in some cases, such as beams of underground structures Although they may be temporarily supported, they have not been used at all as a support material for supporting a considerable vertical load such as a ground structure such as a pillar.

[0005] For this reason, in the conventional method of constructing a structure,
As shown in FIG. 10, even when the above-ground structure is constructed close to above the retaining wall 4, the reverse strut 8 and the reverse strut correspond to the positions of all the pillars of the ground structure. 6, the construction period was prolonged or the cost was increased.

The present invention has been made in view of the above circumstances, and an object of the present invention is to effectively use a core material inside a retaining wall as a support material for supporting a ground structure, thereby shortening the construction period and An object of the present invention is to provide a method for constructing a structure capable of reducing costs.

[0007]

In order to achieve the above-mentioned object, in the method of constructing a structure according to the present invention, a method of constructing a retaining wall constructed by embedding a core material into a retaining wall is carried out by a reverse striking method. When constructing the underground structure and constructing the above-ground structure on this underground structure, the core material exposed on the wall surface of the retaining wall excavated and exposed is attached to the underground structure side. And a load transmitting member for transmitting a vertical load to the core material by projecting the vertical load to the core member, and thereafter, an outer peripheral column receiving the vertical load integrally with the load transmitting member is constructed.

[0008] In the construction method of the above structure, when constructing an underground structure and an above-ground structure, a vertical load is applied to the core material exposed on the wall surface of the retaining wall excavated and exposed by the reverse hitting method. By providing a load transmitting member for transmitting to the material, and then constructing an outer peripheral column that receives a vertical load integrally with the load transmitting member, the vertical column received from the above-ground structure built on the underground structure The load can be received by the outer peripheral column and transmitted to the core material of the earth retaining wall via the load transmitting member. For this reason, even if the ground structure is constructed by, for example, erecting a ground column above the upper end portion of the outer peripheral column, the outer peripheral column can support this. Further, since the outer peripheral column can be constructed by exposing the wall surface of the retaining wall by excavation, construction of the above-ground structure can be started at a stage where construction of the underground structure has been advanced to some extent, as in the related art. From the above, it is not necessary to provide a back strut and a back pile around the underground structure.
The construction period can be shortened and costs can be reduced.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of a method for constructing a structure according to the present invention will be described below with reference to the accompanying drawings. The same components as those in the conventional example are denoted by the same reference numerals.

A method of constructing a structure according to the present invention is a method of constructing an above-ground structure on an underground structure. In the method of constructing an underground structure, the inside of a retaining wall constructed in the ground is excavated. In addition, a reverse striking method is applied in which an underground structure is sequentially constructed from an upper layer side in a space formed inside a retaining wall by excavation, and an overground structure is constructed on the underground structure. In the present embodiment, a case where the present invention is applied to the construction of a building having up to two basement floors will be described as one embodiment of a structure construction method according to the present invention.

FIGS. 1 to 8 show a case where the method of constructing a structure according to the present invention is applied to the construction of a building having up to two basement floors. First, as shown in FIG. 1, a retaining wall 4 is constructed in the ground 2, and a reverse driving pile 6 is provided by concrete inside the retaining wall 4, and a steel frame material such as H-section steel is provided above the pile 6. A reverse strut 8 is provided. The earth retaining wall 4 is constructed by arranging a core member 28 made of H-shaped steel inside in a vertical direction, and includes a soil cement column wall, an underground continuous wall, a parent pile horizontal sheet pile, and the like. Is done. The retaining wall 4 is similar to the reverse pile 6,
It is constructed so that its lower end reaches the stable ground 19 located at a great depth underground.

After constructing the retaining wall 4 and providing the upright pile 6 and the upright supporting column 8, as shown in FIG. 2, the area surrounded by the retaining wall 4 has a predetermined depth. Only the first excavation is performed to construct the floor / beam 26 on the first floor above the ground. When constructing the floor / beam 26 on the first floor above the ground, it is preferable to have a structural relationship with the core 28 embedded in the retaining wall 4. That is, a girder 20 is provided on a core material 28 exposed above the retaining wall 4, and a pillar / beam integrated as a support member for supporting the load of the first floor above the ground and the above-ground structure. The above-mentioned load is transmitted to the core material 28 by hanging the block 22. In detail, in this construction, first, a girder 20 made of steel reinforced concrete, reinforced concrete, or steel reinforced concrete is provided on the retaining wall 4 along the upper end. At this time, the upper end of the core material 28 is exposed to the upper end surface of the retaining wall 4, and the
8 and provided on the upper end thereof. Above the girder 20, a column / beam integrated block 22 is provided as a support member for supporting the load of the first floor above the ground and the above-ground structure. At this time, the column / beam integrated block 22 is disposed and provided immediately above the upper end of the core 28 with the girder 20 interposed therebetween. here,
The column / beam integrated block 22 includes a column joint 22a protruding upward and downward, and a beam joint 22b protruding laterally. This pillar
The beam integrated block 22 is also integrally attached to the upper end of the counter strut 8 exposed by excavation. Then, for example, H
Steel beam 24 made of shaped steel, etc.
It is integrally joined to the second beam joint 22b and installed.
Thereafter, the steel beam 24 and the column / beam integrated block 2
Concrete is integrally cast on 2 to construct a floor / beam 26 on the first floor above the ground. The column / beam integrated block 22
May be integrally processed with the floor / beam 26 and the factory.

Next, the inside of the area surrounded by the retaining wall 4 is excavated to a depth at which the first basement of the underground structure can be constructed (second excavation), and the first basement of the underground structure is excavated. To build.
In the construction of the first basement floor, first, as shown in FIG.
A column / beam integrated block 22 similar to that described above is attached to the outer periphery of the column, and a steel beam 24 is interposed between the column / beam integrated block 22. On the other hand, as shown in FIG. 4, the wall surface of the retaining wall 4 exposed by the excavation is cut into the wall surface of the retaining wall 4 so that the surface of the core 28 made of H-shaped steel inside the retaining wall 4 is removed. Make it appear outside. Then, the exposed surface 2 of the core material 28
On the lower side of 8a, a stud dowel 30 and a beam connecting member 32 are integrally provided as a load transmitting member for transmitting a vertical load to the core material.

As shown in FIGS. 5 and 6, a steel beam 24 is connected between the beam connecting member 32 and the corresponding beam connecting portion 22b of the integrated column / beam block 22. To construct a floor / beam 26 on the first basement floor using concrete. In addition, a steel column material 3 is attached to a lower column joint 22 a of the column / beam integrated block 22 provided on the girder 20.
The steel column members 34 are attached along the vertical direction by joining the upper ends of the four. A large number of stud dowels 36 project from the outer surface of the steel column member 34, and anchor bolts 38 project downward from the lower end. In addition to the anchor bolt 38, a stud dowel may be protruded from the lower end of the steel column member 34. In the gap formed between the lower end of the steel column member 34 and the floor / beam 26 on the first basement floor, a mortar 4 is provided outside the anchor bolt 38.
Zeros are packed, and the lower end of the steel column material 34 is temporarily fixed to the floor / beam 26 side of the first basement floor.

After providing the steel column material 34 in this way, concrete is integrally cast on the steel column material 34,
As shown in FIG. 7, an outer peripheral pillar 42 on the first basement is integrally formed with the retaining wall 4. Also, concrete is cast on the outer periphery of the upright support column 8 to construct the intermediate column 44 on the first basement floor. Here, the vertical load input to the outer peripheral pillar 42 is transmitted to the core material 28 of the retaining wall 4 via the stud dowel 30 or the beam connecting member 32 provided integrally with the core material 28 of the retaining wall 4. Accordingly, as in the case of the intermediate column 44, the skeleton 16 can be assembled from the column members 14 and the beam members 15 of the ground structure above the outer peripheral column 42, and construction of the ground structure can be started.

Thereafter, as shown in FIG. 8, the inside of the retaining wall 4 is further excavated (third excavation), and the second floor 46 of the underground structure, the underground foundation beam 18 and the like are constructed to underground. Along with the construction of structures, the construction of ground structures will also be promoted.

As described above, in the method of constructing a structure, the underground structure is formed by the outer peripheral columns 42 capable of transmitting a vertical load to the core material 28 of the retaining wall 4 via the stud dowel 30 or the beam connecting member 32. Since it is possible to build while supporting the above-ground structure built on the structure, the conventionally used reverse struts and reverse piles on the outer periphery of the underground structure can be unnecessary, shortening the construction period or reducing the cost. Reduction can be achieved.

Further, since the column / beam integrated block 22 as a support member is disposed immediately above the upper end of the core member 28 via the girder 20, the floor of the first floor above the ground and the above-mentioned ground structure are not disposed. The load can be satisfactorily transmitted to the core 28, and the strength of the core 28 can be rationally utilized for supporting the vertical load.

In the above embodiment, the underground structure is made of steel reinforced concrete. However, either the column or the beam, or both the column and the beam may be made of steel.

[0020]

According to the method for constructing a structure according to the present invention as described in the embodiment of the present invention, when constructing an underground structure and an above-ground structure, excavation and exposing are carried out by a reverse strike method. To the core material exposed on the wall of the retaining wall,
By providing a load transmitting member to transmit the vertical load to the core material by projecting to the underground structure side, and then constructing an outer pillar that receives the vertical load integrally with this load transmitting member, Since the vertical load of the ground structure constructed on the object is received by the outer peripheral pillar and transmitted to the core material of the retaining wall via the load transmitting member, the ground structure can be supported. The necessity of a back strut or a back-stake pile on the outer periphery becomes unnecessary, and the construction period can be shortened and the cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view when a retaining wall, a back strut and the like are constructed in a method for constructing a structure according to the present invention.

FIG. 2 is a vertical cross-sectional view when the inside of a retaining wall is excavated and a floor / beam on the first floor above the ground is constructed in the method for constructing a structure according to the present invention.

FIG. 3 is a longitudinal sectional view showing a state in which the inside of the retaining wall is further excavated to construct the first basement underground in the method for constructing a structure according to the present invention.

FIG. 4 is a perspective view showing a state in which a load transmitting member is provided on a core material of a retaining wall in the method for constructing a structure according to the present invention.

FIG. 5 is a perspective view showing a state when an outer peripheral column is constructed in the method for constructing a structure according to the present invention.

FIG. 6 is a partial longitudinal sectional view showing a state when an outer peripheral column is constructed in the method for constructing a structure according to the present invention.

FIG. 7 is a longitudinal sectional view showing a state when an outer peripheral column is constructed in the method for constructing a structure according to the present invention.

FIG. 8 is a longitudinal sectional view showing a state when the construction of the underground structure is completed in the method of constructing a structure according to the present invention.

FIGS. 9A to 9D are explanatory diagrams for explaining an example of a conventional method of constructing a structure.

FIG. 10 is an explanatory diagram for explaining a problem of a conventional structure building method.

[Explanation of symbols]

 2 Ground 4 Earth retaining wall 6 Backlashing pile 8 Backlashing strut 20 Spreader 22 Pillar / beam integrated block 24 Beam member 28 Core material 30 Stud dowel 32 Beam connection member 34 Steel column material 42 Outer pillar

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hiroshi Nagase 4-33, Kitahama-higashi, Chuo-ku, Osaka-shi, Osaka Inside the Obayashi-Gumi head office (72) Inventor Chihiro Tsuji 4-33, Kitahama-higashi, Chuo-ku, Osaka-shi, Osaka Obayashi head office

Claims (1)

[Claims] 1. An underground structure is constructed inside a retaining wall constructed by burying a core material by a reverse striking method,
When constructing an aboveground structure on this underground structure, the core material exposed on the excavated and exposed wall surface of the retaining wall is projected from the underground structure side so that the vertical load is A method for constructing a structure, comprising: providing a load transmitting member for transmitting to a core material; and thereafter, constructing an outer peripheral column that receives a vertical load integrally with the load transmitting member.