JPH101957A - Underground construction method for building - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve work efficiency of construction by a method wherein a first floor beam frame constructed in a preceding construction step can be joined integrally to an underground outer wall constructed in a succeeding construction step without causing a defect in the joined part to provide high strength therein. SOLUTION: A waling 6 in the form of a foundation beam, which is connected to an earth retaining wall 2 along the top end thereof, is provided on a ground surface, and a plurality of earth pressure receiving materials 8 are interposed, at proper intervals, between a preceding above-ground frame 7 integral to a first floor beam frame 3 constructed in a preceding step and the waling 6, whereby the frame 3 functions as a support for the wall 2. An opening is formed between the side end of the frame 3 and the wall 2 and waling 6 and when an underground outer wall 5 is constructed, concrete is cast from the opening and also concrete is filled into the opening to make the frame 3 integral to the wall 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a construction underground construction method for constructing a floor beam skeleton of a permanent construction from the first floor to a basement one by one, mainly based on a reverse striking method, and particularly to a floor girder skeleton and an underground floor on the first floor. The present invention relates to a construction method for constructing a subterranean outer wall that connects floor beam frames on a floor by post-casting concrete work.

[0002]

2. Description of the Related Art As is well known, in this type of construction underground construction method, which is mainly based on the reverse casting method, concrete is placed below the first-floor beam frame structure that was previously constructed and the underground outer wall is left behind. There is a basic problem that the construction work is extremely complicated and that the joint between the first-floor floor beam structure of the preceding construction and the underground wall of the subsequent construction is likely to be defective. Therefore, various construction methods have been attempted in the past.

For example, in the method disclosed in Japanese Patent Laid-Open No. 63-44052, a pipe for concrete pouring vertically penetrates at a predetermined position of a floor beam skeleton, which has been previously constructed.
The underground wall for the post-construction will be constructed by placing concrete from this pipe. Further, in the construction method of Japanese Patent Laid-Open No. 3-260226, when pipes for concrete placement are vertically arranged along the inside of the mountain retaining wall and the floor girder body is constructed and then the underground outer wall is constructed. Then, concrete is poured into the underground outer wall through the pipe. Also, JP-A-5-17
In the method of No. 9804, a number of small holes for concrete casting are formed at the joint between the first-story floor beam skeleton and the retaining wall of the preceding construction, and concrete is poured through the small holes for the underground outer wall of the later construction. Build by things.

[0004] In any of these conventional methods, the workability of concrete placement of the underground outer wall can be improved from the above-ground portion, so that the workability is improved to some extent. However, since concrete is poured through the pipes and small holes, it is difficult to fill concrete in the final stage, and it is still difficult to bring the top of the underground outer wall into close contact with the lower surface of the preceding floor beam frame without defects. . Increasing the number of concrete casting pipes and small holes can improve the concrete filling performance to some extent, but doing so complicates the concrete casting work.

[0005]

As one means for solving the above-mentioned problems, an abdomen is provided at the upper end of the mountain retaining wall, and a jack is interposed between this and the first floor floor structure of the building. ,
While supporting the earth pressure on the Yamadome wall,
It is known that an opening is formed between the floor and the skeleton and concrete is poured from the opening (Magazine: Construction and Technology "Construction" June 1993 issue 78-79).
page). However, in this conventional method, since the jack is to be provided through the outer wall of the underground, there is a drawback that the installation / removal of the jack and the treatment after the removal are required, which is troublesome.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and an object of the present invention is to provide a high-strength integration of a joint between a first-story floor beam structure of a preceding construction and an underground outer wall of a later construction without defects. Another object of the present invention is to provide a construction underground construction method with good construction workability.

[0007]

According to the construction underground construction method of the present invention, the excavation work of the internal ground is basically performed together with the construction of the retaining wall surrounding the construction site, and the underground construction method is used from the first floor to the underground floor. The main floor beam frame will be constructed sequentially, and the underground outer wall connecting the floor beam frame on the first floor and the floor beam frame on the basement floor will be constructed by post-cast concrete work. In this method, the characteristic feature of the present invention is that a foundation beam-like uprising connected to the mountain retaining wall is installed along the upper end of the mountain retaining wall in the ground surface portion, and the preceding construction is performed 1 By interposing a plurality of earth pressure receiving members at appropriate intervals between the preceding ground portion skeleton integral with the floor beam skeleton and the foundation beam-shaped protuberance, the first floor floor beam skeleton is connected to the mountain Along with functioning as a support for the retaining wall, an opening is formed between a side end of the first-floor floor beam frame and the retaining wall and the foundation beam-shaped bulge, and the construction of the underground outer wall is Concrete is poured from the opening, and the opening is also filled with concrete to form a frame integral with the first-floor floor beam skeleton and the underground outer wall. It is preferable that a steel column on the ground floor is used as the preceding above-ground structure. The abdomen can be effectively used as an outer groove for running dogs, balconies, flower beds and the like.

[0008]

1 to 3 show an example of an embodiment of a building underground construction method according to the present invention. First, the construction of the retaining wall with the parent pile horizontal sheet pile surrounding the underground building to be constructed and the excavation work of the internal ground will be advanced. That is, the parent pile 1 made of H-shaped steel is vertically driven into the ground G at appropriate intervals, and the horizontal piles 2 are stretched between the parent piles 1 while excavating the internal ground as appropriate to construct a mountain retaining wall.

The upper end of the parent pile 1 of the retaining wall is appropriately exposed to the ground surface. In the ground surface portion, a foundation beam-shaped uprising 6 connected to the protruding portion of the main pile 1 of the mountain retaining wall is installed along the upper end of the mountain retaining wall.

[0010] Then, firstly, the main construction of the floor beam frame 3 on the first floor is performed by the reverse hitting method, and then, the main construction of the floor beam frame (not shown) on the first basement floor is performed. The floor beam structure 3 is preferably made of steel-framed concrete or reinforced steel-framed concrete.
A structure using beams can also be adopted. This first floor floor beam frame 3
A steel frame column 7 is attached to this. This steel column 7
Is used as the above-mentioned preceding ground part frame.

As shown in FIG. 2 which is a plan view of the ground surface portion, the side of the retaining walls 1 and 2 and the foundation beam-shaped protuberance 6, the first-story floor beam frame 3 and the steel column 7, which were previously constructed. Although there is a relatively large space between them, this space is maintained by the earth pressure receiving member 8 provided between the foundation beam-like uprising 6 and the steel column 7. That is, the large earth pressure applied to the mountain retaining wall is the main pile 1 of the mountain retaining wall, the foundation beam-like uprising 6 connected to the upper end of the parent pile 1, the earth pressure receiving material 8, the steel frame of the preceding ground part frame. It is received by the pillar 7 and the first-floor floor beam frame 3. These foundation beam-shaped protuberances 6, earth pressure receiving members 8, and ground parts (steel columns 7 and 1)
The floor beam structure 3) functions as a support for the retaining walls 1 and 2.

As shown in FIG. 2, the steel columns 7 are arranged at necessary places at appropriate intervals, and an earth pressure receiving member 8 interposed between the steel columns 7 and the base beam-shaped protuberances 6 is provided. Is a small block type member, for example, in which an earth pressure receiving member 8 is provided for each steel column 7. That is, a large number of small earth pressure receiving members 8 are installed at large intervals. Therefore, a large gap is maintained between the foundation beam-shaped upholstery 6 and the side end portion of the first-floor beam frame body 3, and this gap portion serves as an opening for concrete pouring as described below. .

[0013] Further, as shown in FIG.
The formwork 4 is installed vertically below the beam to form a concrete casting space for the underground outer wall 5 to be constructed. Of course, before the formwork 4 is installed, necessary reinforcing bars (not shown) are installed in the concrete casting space. In other words, rebar work and formwork for the underground outer wall 5 are performed, and the parent pile 1, the horizontal sheet pile 2, the formwork 4, and the concrete placing space surrounded by the side ends of the preceding first-floor floor beam frame 3 are formed. The concrete underground wall 5 is constructed by filling with concrete.

Here, the feature of the background of the present invention is that the uppermost part of the concrete placing space is a large opening that opens upward. That is, although the earth pressure receiving members 8 are present at appropriate intervals, a large opening is formed between the side end portion of the first-floor floor beam frame 3 and the foundation beam-shaped bulge 6. Since concrete is poured from this really large opening, the work is extremely easy,
Efficiency is good and the filling property of concrete is also good.

As shown in FIG. 3, finally, at the space (the opening) between the side end of the first-story floor beam frame 3 and the retaining walls 1 and 2 and the foundation beam-shaped protuberance 6. Is also filled with concrete to form a skeleton integrally connected to the first-floor floor beam skeleton 3 and the underground outer wall 5. Therefore, the structural connectivity between the first-floor floor beam frame 3 of the preceding construction and the underground outer wall 5 of the subsequent construction is extremely high. Finally, the base beam-shaped prow 6 can be used as a veranda or a dog running on the parent pile 1 of the retaining wall.

[0016]

According to the present invention, a foundation beam-shaped waving that is connected to the mountain retaining wall is installed along the upper end of the mountain retaining wall at the ground surface portion, and the first-floor floor beam that is constructed in advance is installed. By interposing a plurality of earth pressure receiving members at appropriate intervals between the preceding ground part skeleton integral with the skeleton and the foundation beam-shaped protuberance, the first-floor floor beam skeleton is connected to the retaining wall of the mountain retaining wall. While functioning as a support work, an opening is formed between the side end of the first-floor floor beam skeleton and the mountain retaining wall and the foundation beam-shaped uprising. In other words, since the earth pressure receiving material is interposed between the preceding ground part frame higher than the first floor floor beam frame of the building and the bulge, it is necessary to provide a jack through the underground outer wall as in the conventional case. No, for this, jack installation
There is no need for removal and post-removal treatment, thus speeding up construction and saving costs.

Further, according to the present invention, the foundation beam-shaped uprising provided in connection with the upper end of the main pile of the retaining wall can be effectively utilized as a veranda or a dog running. In this case, at the time of underground excavation, the outer ditch has already been constructed ahead of time, and it can be used as a work passage and also as a basis for assembling scaffolds for ground work, improving safety and speeding up work Contribute. Further, if a steel column is used as the preceding ground part body for installing the earth pressure receiving material, the installation level of the foundation beam-shaped uprising is not restricted, and the present invention can be easily applied.

[Brief description of the drawings]

FIG. 1 is a construction drawing showing an example of an embodiment of a construction underground construction method according to the present invention.

FIG. 2 is a schematic plan view showing an arrangement of a ground surface portion in the embodiment.

[Fig. 3] Fig. 3 is a construction drawing at the stage of placing concrete on the underground outer wall in the same example.

[Explanation of symbols]

 1 Parent pile of retaining wall 2 Horizontal sheet pile of retaining wall 3 Main 1st floor beam frame 4 Formwork for underground outer wall 5 Underground outer wall 6 Base beam-shaped bulging 7 Steel column (preceding aboveground frame) 8 Earth pressure receiving material

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Nobuhiko Suzuki 2-3-3 Kandaji-cho, Chiyoda-ku, Tokyo Co., Ltd. Obayashi-gumi Tokyo head office (72) Inventor Shokichi Gokan 2-3-3 Kandaji-cho, Chiyoda-ku, Tokyo Obayashi Corporation Tokyo Head Office (72) Inventor Koichiro Kurisu 4-640 Shimoseito, Kiyose-shi, Tokyo Inside Obayashi Corporation Technical Research Institute

Claims (3)

[Claims] 1. Excavation work of the inner ground together with construction of a retaining wall surrounding a building site, and a permanent floor frame is sequentially constructed from a first floor to a basement floor by a reverse striking method, and a floor frame of the first floor is constructed. In the construction underground construction method in which the underground outer wall that connects the floor structure of the basement and the basement floor is constructed by post-concrete construction work, in the ground surface part, along the upper end of the mountain retaining wall, Along with setting up a belly,
By interposing a plurality of earth pressure receiving materials at appropriate intervals between the preceding ground part frame body integrated with the first-floor floor beam structure that was constructed in advance and the foundation beam-shaped uprising, the first-floor floor beam The skeleton body functions as a support for the retaining wall, and an opening is formed between a side end of the first-floor floor beam skeleton and the retaining wall and the foundation beam-shaped bulge, and the underground outer wall is formed. In the construction, the concrete is poured from the opening, and the opening is also filled with concrete to form a structure integrated with the first-floor floor beam structure and the underground outer wall. 2. The method according to claim 1, wherein a steel column on a ground floor is used as the preceding ground part frame. 3. The construction underground construction method according to claim 1, wherein the abdomen is used as an outer groove for running dogs, balconies, flower beds and the like.