JP3809340B2 - Reverse strike method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a reverse driving method that shortens the work period or improves workability when a building is constructed with an n-th floor underground (n ≧ 1).
[0002]
[Prior art]
Conventionally, as an underground construction method, as shown in FIG. 11, a continuous wall for retaining is constructed on the ground 1. This continuous wall 5 is a soil cement column constructed by drilling a hole in the ground with an earth auger or the like, putting H steel into the hole, and hardening it with soil cement (a mixture of cement, sand and soil). It is a row wall. Then, as shown in FIG. 11 (B), the ground 1 is rooted by one step, and support works such as the erection 15 and the piercing beam 16 / fired beam are erected and secondary excavation is performed.
[0003]
After the secondary excavation, as shown in FIG. 11 (C), the second stage support 17 is installed, and after the third excavation and reaching the root cutting bottom 1a, as shown in FIG. 11 (D). In addition, it is known that an underground frame 18 such as a foundation beam, an underground outer wall, and the like are constructed by forming a formwork, and the support work 17 is sequentially disassembled.
[0004]
In addition, as the reverse construction method of the underground structure, the floor on the first floor is constructed first, and this floor is used as a supporting work to prevent the collapse of the ground. A construction method is known in which a basement frame is constructed and work is carried out in parallel with the upper frame to shorten the construction period.
[0005]
[Problems to be solved by the invention]
However, the conventional order construction method requires temporary support work such as raising the bellows and cutting beams, which obstructs the construction of the concrete frame, increases the cost, and increases the construction period. In addition, with the conventional reverse driving method, it is possible to shorten the work period by simultaneous construction with the upper frame, but in underground root cutting, the excavation span becomes longer due to the height of the underground floor and the foundation beam (usually 6-8m), and it is necessary to use a temporary support such as a cut beam, which is troublesome. The reverse driving method according to the present invention is proposed to solve such a problem.
[0006]
[Means for Solving the Problems]
The gist of the reverse driving method according to the present invention is to construct a retaining wall around the building, substantially perpendicular to the inside of a part of the retaining wall, After constructing a retaining wall, after constructing the first floor, basement of the underground floor is performed from the central part, and the outer peripheral part is left in accordance with the independence of the ground and the slope of the slope is appropriately adjusted. Excavating the space, and supporting the mountain retaining wall by the retaining wall and the earth and sand of the outer peripheral portion without using the erection or temporary support of the beam, and constructing the underground frame.
[0007]
The retaining wall and the earth and sand at the outer periphery include that the underground frame is constructed between the retaining walls and supports the retaining wall, and then dismantled together with the excavated soil .
[0008]
According to the reverse striking method according to the present invention, when constructing a retaining wall, by constructing a retaining wall, during construction of the underground frame in the reverse striking method, such as a cut beam, an upset, a steel beam, etc. There is no need to provide a temporary support.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Next, the reverse driving method according to the present invention will be described with reference to the drawings. In order to facilitate understanding of the invention, portions corresponding to the conventional example are denoted by the same reference numerals as those of the conventional example.
[0010]
As shown in FIG. 1, first, the reverse cementing method is performed by drilling a soil cement 3 in the hole 2 while drilling the ground 1 along the periphery of the building with a drilling machine such as an earth auger. Filled, and further inserted H steel 4 and hardened. This soil cement column array constitutes a continuous wall 5 as a retaining wall.
[0011]
Next, the retaining wall 6 is constructed on the inner side of the continuous wall 5 in a direction substantially orthogonal to the continuous wall 5 by using the drilling machine. The retaining wall 6 is a coreless column of soil cement pillars constructed by hardening the soil cement without inserting H steel into the hole. The pitch of the retaining wall 6 is determined from the center distance of the building 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).
[0012]
The retaining wall 6 is constructed with two series of soil cement columns, but when there are a plurality of underground floors and strong earth pressure is generated, for example, three series of soil cement columns It is something to do.
[0013]
Next, as shown in FIG. 2, a pile 7 and a construction pillar (main pillar) 8 are constructed at a position to be a pillar of the underground frame. Then, as shown in FIG. 3, the ground 1 is rooted to the position of the upper end of the retaining wall 6, concrete is laid with a floor formwork on the first floor, and the floor 9 on the first floor of the building is placed. To construct.
[0014]
After the floor 9 is constructed, as shown in FIG. 4, root cutting for the first basement is performed from the central portion, and excavation is performed leaving the outer peripheral portion 10. As shown in FIG. 5, for example, the outer peripheral portion 10 can be left by excavating between the retaining walls 6 and 6 every 1 span (about 6 to 8 m) according to the independence of the ground 1 or Excavation between the retaining walls 6 and 6 for one span is performed while leaving the outer peripheral portion for two to three spans. In addition, the slope of the slope of the outer peripheral portion 10 is appropriately handled in consideration of earth pressure.
[0015]
In the state shown in FIG. 4, the earth pressure from the surrounding ground 1 is supported by the retaining wall 6 and the earth and sand 10 a of the remaining outer peripheral portion 10, and a temporary support such as a bellow or a beam is not used. Then, as shown in FIG. 6, the slab 11 of the 1st basement floor is constructed.
[0016]
In the central part of the slab 11, an opening is provided for excavation of the lower floor. As shown in FIG. 7, the slab 11 and the beam 11b are constructed in the outer peripheral portion 10 of the slab 11.
[0017]
The continuous wall 5 is supported by the slab 11 and the beam 11b in the lower part of the first-floor space. Therefore, the continuous wall 5 that receives the earth pressure of the ground 1 is combined with the first floor 9 and the slab 11. The support of is strengthened.
[0018]
Thus, when the continuous wall 5 is supported in the horizontal direction and there is no risk of collapsing, the remaining earth and sand 10a and the retaining wall 6 of the outer peripheral portion 10 are disassembled together with a working machine such as a backhoe and removed. Although the said retaining wall 6 is a soil cement pillar row | line | column, since it is a coreless material soil cement pillar row | line | column without core materials, such as H steel, it can be demolished with earth and sand.
[0019]
And as shown in FIG. 8, after removing the said retaining wall 6 and earth and sand 10a, the slab and the beam 11b are constructed | assembled. Then, as shown in FIG. 9, the outer peripheral wall 12 for the first basement is constructed. Of course, at the same time as the construction of this basement, one or more upper floors are constructed at the same time.
[0020]
Next, the lower floor is excavated and earthed from the opening at the center of the slab 11 to proceed to the construction of the second basement floor. In the construction of the second basement floor, as in the construction of the first basement floor, the central part is excavated without using a temporary support, and the outer peripheral part 10 is excavated every span, for example, by leaving one span. To do.
[0021]
Further, for example, in the case of the end on the second basement floor, as shown in FIG. 10, an underground frame 13 such as a foundation beam and a spring pit is constructed. And after the underground housing 13 is completed and the continuous wall 5 is supported, the retaining wall 6 and the earth and sand 10a of the outer peripheral part 10 left together are disassembled and removed. Then, the outer peripheral wall 14 is constructed.
[0022]
In this way, the underground structure is supported by the retaining wall without using a temporary support such as a cut beam or a wake, and the reverse driving method is performed.
[0023]
【The invention's effect】
As described above, the reverse driving method according to the present invention constructs a retaining wall around a building, and is substantially perpendicular to the inside of a part of the retaining wall, and also has a retaining wall of an uncentered soil cement column array. After the first floor is constructed, the basement of the basement floor is cut from the center part, and the outer peripheral part is excavated between the retaining walls with the slope of the slope corresponding to the independence of the ground. However, since the mountain retaining wall is constructed by supporting the retaining wall by the retaining wall and the earth and sand of the outer peripheral portion without using the temporary support for the erection or the beam, the temporary support is provided in the construction of the underground structure. The work to install and dismantle the work is omitted, it is easy to work in the underground space without being interrupted by the beam, etc., and it is possible to simultaneously work with the upper floor and shorten the work period. It is.
[0024]
In addition, the retaining wall is a coreless soil cement column, so it can be constructed simultaneously with the continuous wall. Further, the retaining wall and the earth and sand on the outer periphery are dismantled together with the excavated soil after the underground frame is constructed between the retaining walls and the mountain retaining wall is supported. It can be removed and the dismantling work becomes easy.
[Brief description of the drawings]
BRIEF DESCRIPTION OF DRAWINGS FIG. 1 is a diagram for explaining a reverse driving method according to the present invention, which is a plan view (A) and a partial cross-sectional view (B) of a continuous wall.
FIG. 2 is an explanatory view showing that piles and construction pillars are provided by the reverse driving method according to the present invention.
FIG. 3 is an explanatory view showing a state in which a first floor is constructed by a reverse driving method according to the present invention.
FIG. 4 is an explanatory view of a state where excavation is performed with the outer peripheral portion left by the reverse driving method according to the present invention.
FIG. 5 is an explanatory view of the outer peripheral portion in the reverse driving method according to the present invention.
FIG. 6 is an explanatory diagram of a state in which a slab on the first basement floor is constructed by the back-strike method according to the present invention.
FIG. 7 is an explanatory view showing a state of construction of a slab between retaining walls in the reverse driving method according to the present invention.
FIG. 8 is an explanatory view showing a state in which the retaining wall is removed by the reverse driving method according to the present invention.
FIG. 9 is an explanatory view showing a state in which the frame construction on the first basement floor is completed by the reverse driving method according to the present invention.
FIG. 10 is an explanatory view showing a state in which the frame construction up to the second basement floor is completed by the reverse driving method according to the present invention.
FIGS. 11A and 11B are explanatory diagrams (A), (B), (C), and (D) of a conventional striking method according to a conventional example.
[Explanation of symbols]
1 ground, 2 holes, 3 soil cement, 4 H steel, 5 continuous walls,
6 Reservation wall, 7 piles, 8 true pillars, 9 floor on the 1st floor, 10 outer periphery,
10a earth and sand, 11 slab, 11b beam, 12 outer peripheral wall,
13 underground building, 14 outer peripheral wall, 15 upset, 16 cut beam,
17 Supporting work, 18 underground building.

Claims (2)

A mountain retaining wall is built around the building, and a part of the mountain retaining wall is substantially orthogonal to the inside. Excluded from the central portion, excavating between the retaining walls, leaving the outer periphery in accordance with the independence of the ground and appropriately adjusting the slope of the slope, and do not use the erection or temporary support of the beam In order to support the mountain retaining wall by the retaining wall and the earth and sand of the outer peripheral portion, to construct an underground frame,
A reverse hammering method characterized by The retaining wall and the earth and sand of the outer peripheral part are dismantled together with the excavated soil after an underground frame is built between the retaining walls and supports the retaining wall,
The reverse driving method according to claim 1.

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