JPH04179727A - Construction method of underground structure of building - Google Patents

Abstract

PURPOSE:To allow an earth retaining wall to have a strength as an underground outer wall at low cost by providing beam reinforcing bars, column reinforcing bars and foundation pile reinforcing bars in cages of earth retaining wall and counterfort which are constructed around the underground structure of a building. CONSTITUTION:Two cages 4, 4 for earth retaining wall in which horizontal beam reinforcing bars are provided are set in an excavated ditch 3 provided for an earth retaining wall, and concrete 7 is placed only between joint boxes 5, 5 on both sides. A cage 9 comprising horizontal reinforcing bars and vertical column reinforcing bars is provided in a ditch 8 for a countrfort excavated in a direction normal to the ditch 3 and, in a section of the ditch 5 to which the ditch 8 is connected in such a manner that such side of the cage 9 wherein column reinforcing bars are not provided comes into contact with an earth retaining wall 1 in which concrete 7 is placed. Concrete 10 is cast into the ditch 8, in said section of the ditch 3 and in the space of joint boxes 5 to construct a counterfort 2 integrally with the earth retaining wall 1.

Description

[Detailed Description of the Invention] (Industrial Application Field) This invention constructs a self-supporting earth retaining wall with a T-shaped retaining wall integrated on the inner surface around the basement of a building, and connects this earth retaining wall to the underground outer wall of the building. Concerning underground framework construction methods for buildings that are also used as buildings.

(Prior art) For example, as seen in Japanese Unexamined Patent Publication No. 2-29124, an earth retaining wall (underground continuous wall) constructed around the basement of a building is not simply an earth retaining wall, Research and development efforts are actively being carried out to actively utilize it as an underground structure.

A typical free-standing retaining wall with a T-shaped retaining wall integrated on the inner surface is not strong enough to be used as a permanent underground exterior wall, so underground beams are installed to obtain the strength required for an underground exterior wall. Usually, the main structure, such as pillars or pillars, is attached to the retaining wall.

(Problem to be Solved by the Invention) If the wall thickness of the retaining wall and the retaining wall is made sufficiently large, and reinforcing bars of sufficient density and structure are incorporated, the main body frame such as the above-mentioned underground beams and columns can be Even without installing a separate earth retaining wall, it is possible to obtain the necessary strength as a permanent underground external wall. However, in that case, the amount of concrete and reinforcing bars used for the retaining walls and retaining walls would be enormous, leading to an overall over-design and a significant increase in construction costs.

This invention was made in view of the above-mentioned conventional problems.The purpose of this invention is to improve the structure of the earth-retaining wall at a minimum cost by devising the reinforcement structure of the reinforcing bar cage built into the earth-retaining wall body and retaining wall. An object of the present invention is to provide an underground framework construction method for a building that can provide the necessary strength as an underground exterior wall.

(Means for Solving the Problem) Therefore, in this invention, an earth retaining wall with a T-shaped retaining wall integrated on the inner surface is constructed around the basement of a building, and this earth retaining wall is used as an underground outer wall of the building. In addition, reinforcing bars are densely arranged in the retaining wall reinforcing bar cage and the retaining wall reinforcing bar cage to provide horizontally long beam reinforcement, and reinforcing bars are densely arranged in the retaining wall reinforcing bar cage. Long column reinforcement was provided in the vertical direction.

In addition, reinforcing bars were further densely arranged on the reinforcing bar cage for the retaining wall to provide long foundation pile reinforcement in the vertical direction.

(Function) The beam reinforcement is built into the underground outer wall and the retaining wall at key points, and the column reinforcement is built into the retaining wall at key points, as well as the foundation pile reinforcement. This provides sufficient strength as the permanent underground framework of a building.

(Embodiment) Figs. 1 to 6 show the construction procedure of an underground framework construction method according to an embodiment of the present invention.

First, as shown in FIG. 1, a trench 3 for the retaining wall is excavated, and as shown in FIG. 2, two reinforcing bar baskets 4 for the retaining wall are set in the trench 3.

Details of the reinforcing bar cage 4 for the retaining wall are shown in Figure 7. A hollow rectangular tube consisting of a joint box 5 and a partition plate 6 is attached to both end portions of the reinforcing bar cage 4. The joint box 5 has a U-shaped cross section, and when combined with the partition plate 6, a hollow square tube is formed. The joint box 5 is fixed to the side end of the reinforcing bar basket 4, and the partition plate 6 is detachably attached to the joint box 5 by sliding in the vertical direction.

The side ends of the reinforcing bar cage 4 are housed in a hollow rectangular tube consisting of a joint box 5 and a partition plate 6.

Further, as shown in FIG. 2, the two reinforcing bar cages 4.4 are set in the groove 3 so as to maintain a predetermined distance between the partition plates 6.6.

Next, as shown in FIG.
Concrete 7 is poured in the space between. In other words, concrete is not poured in the area covered by the joint box 5 and the partition plate 6, and also in the space between the partition plates 6, 6 of the two reinforcing bar cages 4.

The concrete 7 poured in this process forms the bulk of the retaining wall.

Next, as shown in FIG. 4, a groove 8 for the retaining wall is excavated so as to be perpendicular to the groove 3 for the retaining wall in a T-shape. This groove 8
is continuous with the groove 3 in the space between the two joint boxes 5.5.

Next, as shown in FIG. 5, a reinforcing bar basket 9 for the retaining wall is set in the groove 8 for the retaining wall and a part of the groove 3 continuous thereto, and at the same time two bars located on both sides of the reinforcing bar basket 9 are set. The partition plate 6 is pulled upward to expose the side end portion of the reinforcing bar cage 4 for the retaining wall inside the joint box 5.5. Note that FIG. 8 shows details of the reinforcing bar cage 9 for the retaining wall.

Next, as shown in FIG. 6, concrete 1o is placed in a part of 7s8 and 3, where the reinforcing bar cage 9 for the retaining wall is set, and in the space inside the joint box 5.

At this time, column reinforcement may be arranged in the space between the joint boxes 5 as necessary to construct the column portions 32 (
(See Figures 9 and 10). The retaining wall is constructed using this concrete 10, and the earth retaining wall made of the divided concrete 7 is continued, and the retaining wall and the retaining wall are integrated including the internal reinforcing bar cage.

As shown in FIG. 7, a horizontally long beam reinforcement 4a is provided at a predetermined position of the earth retaining wall reinforcing bar cage 4, with reinforcing bars arranged densely. Similarly, as shown in FIG. 8, at predetermined positions of the reinforcing bar cage 9 for the retaining wall, there are provided beam reinforcements 9a that are long in the horizontal direction and have reinforcing bars arranged densely. A vertically long column reinforcement 9b is provided. The retaining wall reinforcing bar cage 9 is arranged so that the side without the column reinforcement 9b is in contact with the retaining wall.

Although not shown in the drawings, the reinforcing bar cage 9 for the retaining wall is equipped with foundation pile reinforcement that reaches the supporting ground, so that the retaining wall 30
The foundation pile portion 31 is formed in such a way that it is built into the foundation pile (the first
(See figure 0).

With the structure and construction method explained above, as shown in Figures 9 and 10, an earth retaining wall 20 with retaining walls 30 integrated into the inner surface at appropriate intervals in a T-shape is constructed around the basement of the building. In addition to using the earth retaining wall 20 as an underground outer wall of a building,
The retaining wall 30 is used as a partition wall or foundation pile for the basement floor. In addition, 32 is a column part, and 33 is a post-cast underground beam part.

(Effects of the Invention) As explained in detail above, in this invention, beam reinforcement, column reinforcement, and foundation pile reinforcement are partially provided in the retaining wall reinforcing bar cage and the retaining wall reinforcing bar cage, and the retaining wall and retaining wall The strength of the retaining wall can be greatly improved with the minimum amount of frame material required, so we use underground beams and columns like conventional ones.

There is no need to add a main body frame consisting of foundation piles, and the earth retaining wall, which can be constructed relatively inexpensively by the construction method of the present invention, can be fully utilized as the permanent underground outer wall of a building.

[Brief explanation of drawings]

Figures 1 to 6 are diagrams showing the construction procedure of an underground framework construction method according to an embodiment of the present invention, Figure 7 is a perspective view of a reinforcing bar cage for earth retaining walls in the above embodiment, and Figure 8 is a diagram showing the construction procedure of an underground framework construction method according to the above embodiment. FIG. 9 is a perspective view of a reinforcing bar cage for retaining walls, and FIG.
Figure 0 is a plan view showing the whole. 1... Retaining wall body 2... Retaining wall 3.
... Groove for earth retaining wall 4 ... Reinforcement cage 4a for earth retaining wall ... Beam reinforcement 5 ... Joint box 6 ... Partition plate 7・・・・・・
・Concrete 8...Groove for retaining wall 9...
...Reinforcing bar cage for retaining wall 9a...Beam reinforcement 9b.
... Column reinforcement 10 ... Concrete 20 ... Retaining wall 30 ... Retaining wall 31 ... Foundation pile portion patent applicant Obayashi Kumijo Co., Ltd.
Patent Attorney - Ken Iro Axis
Patent Attorney Masatoshi Matsumoto Figure 1 Figure 3

Claims (2)

[Claims] (1) In a construction method in which an earth retaining wall with a T-shaped retaining wall integrated on the inner surface is constructed around the basement of a building and this earth retaining wall is used as an underground outer wall of the building, the steel cage for the earth retaining wall and the retaining wall The reinforcing bar basket is densely arranged to provide horizontally long beam reinforcement, and the retaining wall reinforcing bar cage is densely arranged to provide vertically long column reinforcement. Underground construction method for buildings. (2) The underground framework construction method for a building according to claim 1, characterized in that reinforcing bars are further arranged densely in the reinforcing bar cage for retaining walls to provide vertically long foundation pile reinforcement.