JP2002275922A - Reversed placing method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a reversed placing method capable of reducing a construction period or improving workability when, for example, a building having the first basement is constructed. SOLUTION: The reversed placing method is so constituted that an earth retaining wall 5 is constructed around the building, a buttress 6 at approximately right angles to the inside of part of the earth retaining wall 5 is constructed, an excavation is carried out by leaving the circumference section of the basement behind to erect a permanent column 8 from the bottom of the excavation, the earth retaining wall 5 is supported by the buttress 6 to construct the first floor and an underground skeleton and that the buttress 6 is dismantled together with the excavated soil of the circumference section after the upstairs have been constructed and, at the same time, the underground skeleton has supported the earth retaining wall 5.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reverse striking method for shortening a construction period or improving workability when a relatively lightweight building is provided with a first basement floor.

[0002]

2. Description of the Related Art Conventionally, as an approach to underground structure,
As shown in FIG. 9, a continuous wall for mountain retaining is constructed on the ground 1. The continuous wall 5 is, for example, a soil cement column constructed by drilling a hole in the ground with an earth auger or the like, inserting H steel into the hole, and hardening with soil cement (a mixture of cement and sand / soil). It is a row wall. Then, as shown in FIG. 9 (B), the ground 1 is cut down by one step, and erections such as the belly 15, the cut beam 16, and the blow beam are erected, and secondary excavation is performed.

[0003] After the secondary excavation, as shown in FIG. 9 (C), the second-stage support 17 is erected, and after the third excavation reaches the root excavation bottom 1a, FIG. As shown in (1), it is known to construct an underground frame 18 such as a foundation beam, an underground outer wall, and the like by assembling a formwork, and disassemble the support 17 sequentially.

[0004] In addition, as a method of reverse striking the underground structure, 1
The floor of the floor is constructed first, and this floor is used as a support to prevent the ground from collapsing, and the excavation span becomes longer due to the height of the basement floor and the foundation beam. 2. Description of the Related Art There is known a construction method in which an underground excavation is performed, a skeleton on an underground floor is constructed, work is performed in parallel with an upper skeleton, and the construction period is shortened.

[0005]

However, in the conventional direct-injection method, temporary supports such as erection and cutting beams are required, which hinders the construction of the concrete body, increases the cost and increases the construction period. Become. In addition, with the conventional reverse hitting method, it is possible to shorten the construction period by simultaneous construction with the upper skeleton, but at the basement of the underground, piles and straight columns are installed, and due to the height of the basement and Since the excavation span becomes long, it is necessary to provide a temporary support such as a cutting beam or the like, and there is a problem that it takes time and effort. The reverse strike method according to the present invention is proposed to solve such a problem.

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problem of the reverse hitting method according to the present invention, a gutter wall is constructed around a building, and a part of the gutter wall is substantially perpendicular to the inside of the gutter wall. A wall is constructed, root excavation is performed while leaving the outer peripheral part of the basement floor, and a main pillar is erected from the root of the basement, and the retaining wall is supported by the butting wall, and the first floor and the underground skeleton are connected. After the construction, the upper floor is constructed, and the underground skeleton supports the retaining wall, the retaining wall is dismantled together with the excavated soil at the outer peripheral portion.

[0007] The mountain retaining wall may be a continuous wall formed of a soil cement column, and the stay wall may be a soil cement column of an uncentered material.

[0008] According to the reverse striking method according to the present invention, the retaining wall provided on the retaining wall supports the retaining wall,
There is no need for temporary support such as cutting beams or uplifting in ground excavation. In addition, piles and
There is no need to provide straight pillars, and the efficiency of root cutting work is improved. Furthermore, after the first floor is constructed, the construction of the upper floor can be advanced, and the excavation of the outer peripheral portion and the dismantling and removal of the buttress can be simultaneously advanced, thereby shortening the construction period.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Next, a reverse striking method according to the present invention will be described with reference to the drawings. To facilitate understanding of the present invention, portions corresponding to those of the conventional example will be denoted by the same reference numerals as those of the conventional example.

First, as shown in FIG. 1, the procedure of the above-mentioned reverse beating method is as follows. The cement 3 is filled, and the H steel 4 is further inserted and hardened. The continuous wall 5 as a mountain retaining wall is constituted by this soil cement column.

Next, a buttress wall 6 is constructed using the drilling machine inside the continuous wall 5 in a direction substantially orthogonal to the continuous wall 5. The buttress wall 6 is an uncentered soil cement column array constructed by hardening soil cement without inserting H steel into the holes. The pitch of the retaining wall 6 is determined based on the spacing between the street cores and the ground conditions. The depth of the hole is substantially the same as the depth of the continuous wall 5. Further, the upper end position of the retaining wall 6 is a distance a (about 2 to 3 m) from the ground line (GL in the figure).

In the present invention, the retaining wall 6 is constructed as a double column of soil cement columns assuming that it can withstand the earth pressure of a span of one basement floor (a depth of about 6 to 8 m). . In addition, no piles and timber columns are provided in the normal reverse driving method.

Next, as shown in FIG. 2, the ground 1 is cut down to the upper end of the retaining wall 6 at the outer peripheral portion, and excavation is performed excluding the outer peripheral portion 10 at the central portion. As shown in FIG. 3, the outer peripheral portion 10 may be left, for example, by excavating every one span (approximately 6 to 8 m) depending on the independence of the ground 1, or by the outer peripheral portion of 2 to 3 spans. Or excavation for one span. The slope of the slope of the outer peripheral portion 10 is appropriately adjusted in consideration of the earth pressure.

During the excavation, the continuous wall 5 receiving the earth pressure from the surrounding ground 1 is supported by the butting wall 6 and the remaining outer peripheral portion 10, and the temporary supporting structure such as a bulge or a cut beam is provided. Is not used.

When the excavation reaches the root cutting bottom 1a,
As shown in FIG. 4, the foundation 7 and the main pillar 8 are respectively erected at predetermined positions. Then, as shown in FIGS.
Underground structures 9 such as foundation beams and spring pits are respectively constructed on the floor 9 and the excavated portions in the central portion and the outer peripheral portion 10. Regarding which of the first floor 9 and the underground skeleton 11 is to be constructed first, for example, by constructing the first floor 9 first, it becomes a support member for the head of the continuous wall 5, and Floor construction can be performed at the same time. It does not prevent the underground skeleton 11 from being constructed first and the first floor 9 from being constructed thereafter.

The construction of the underground frame 11 allows the continuous wall 5
Is supported at the lower part of the first basement space, so that the first floor 9 and the underground skeleton 11 together support the continuous wall 5 receiving the earth pressure of the ground 1.

Therefore, as shown in FIGS. 6 and 7, the remaining earth and sand of the outer peripheral portion 10 and the retaining wall 6 are dismantled and removed together with a working machine such as a backhoe. Although the retaining wall 6 is a column of soil cement, it is a coreless column of soil cement having no core such as H steel, and can be dismantled together with earth and sand.

Then, as shown in FIG. 8, an outer peripheral wall 12 for one basement floor is constructed. It goes without saying that one or more upper floors are constructed simultaneously with the construction of the basement floor.

As described above, in a building having a first basement floor, the basement floor is provided with a retaining wall on a retaining wall without a pile or a straight pillar and without a temporary support in excavation of the ground. In order to prevent the collapse of the retaining wall by supporting the earth pressure, a reverse striking method is performed.

[0020]

As described above, according to the reverse striking method according to the present invention, a retaining wall is constructed around a building, and a retaining wall which is substantially perpendicular to the inside is constructed on a part of the retaining wall, and a basement floor is constructed. Excavation is carried out leaving the outer periphery of the base, and a main pillar is erected from the excavation bottom, and the retaining wall is supported by the retaining wall, thereby constructing the first floor and the underground skeleton, and constructing the upper floor And after the underground skeleton supports the retaining wall,
Since the buttress wall is dismantled together with the excavated soil at the outer periphery, the reverse striking method can be adopted in the construction of the first basement floor, and the underground skeleton can be constructed without providing piles and straight pillars, and temporary support structures are installed and installed. The dismantling work is omitted, the work in the underground space is facilitated without being disturbed by the cutting beams, etc., and the simultaneous construction with the upper floor is made possible, thereby achieving an excellent effect of shortening the construction period.

The retaining wall is a continuous wall composed of soil cement column walls, and the retaining wall can be constructed by using a working machine for constructing the continuous wall, thereby improving work efficiency. Also,
Since the buttress wall is a column of soil cement column made of a hollow material, it can be constructed simultaneously with the continuous wall.

[Brief description of the drawings]

FIG. 1 is a plan view (A) and a partial cross-sectional view (B) of a continuous wall, illustrating a reverse striking method according to the present invention.

FIG. 2 is a view for explaining the reverse driving method according to the present invention, and is an explanatory view of a state where the ground is cut off.

FIG. 3 is an explanatory view of an outer peripheral portion in the reverse striking method according to the present invention.

FIG. 4 is an explanatory view showing a state in which a foundation and a main pillar are provided by the reverse striking method according to the present invention.

FIG. 5 is an explanatory view showing a state in which a first floor and an underground skeleton are constructed by the reverse striking method according to the present invention.

FIG. 6 is an explanatory view showing an underground skeleton at an outer peripheral portion by the reverse striking method according to the present invention.

FIG. 7 is an explanatory view showing a state in which the butter wall and the soil on the outer peripheral portion are dismantled and removed by the reverse striking method according to the present invention.

FIG. 8 is an explanatory view showing a state where the construction of the underground skeleton is completed by the upside down method according to the present invention.

FIG. 9 is an explanatory view (A) of a conventional driving method according to a conventional example,
(B), (C) and (D).

[Explanation of symbols]

1 Ground, 2 holes, 3 soil cement, 4 H steel, 5
Continuous wall, 6 buttress wall, 7 piles, 8 pillars, 9 floor, 10 outer floor, 10 perimeter, 10a earth and sand, 11 basement, 1
2 Outer wall, 15 upset, 16 beam, 17 shoring, 18 basement.

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[Procedure amendment]

[Submission date] March 16, 2001 (2001.3.1.
6)

[Procedure amendment 1]

[Document name to be amended] Drawing

[Correction target item name] All figures

[Correction method] Change

[Correction contents]

FIG.

FIG. 2

FIG. 4

FIG. 5

FIG. 7

FIG. 3

FIG. 6

FIG. 8

FIG. 9

Claims (3)

[Claims] 1. A mountain retaining wall is constructed around a building, a buttress wall substantially perpendicular to the inside is constructed on a part of the mountain retaining wall, and excavation is performed by leaving an outer peripheral portion of a basement floor. And the main pillars are erected, and the retaining wall is supported by the retaining wall to construct the first floor and the underground skeleton. The upper floor is constructed, and the underground skeleton supports the retaining wall. And dismantling the butting wall together with the excavated soil at the outer periphery. 2. The method according to claim 1, wherein the retaining wall is a continuous wall formed of soil cement column walls. 3. The method according to claim 1, wherein the stay wall is a column of a soil cement column made of an uncentered material.