JP5017528B2 - Cast-in-place concrete earth retaining method - Google Patents

Description

  The present invention relates to an iron temporary frame box and earth retaining method. In the case of relatively shallow earth retaining, the simple construction method along the planned underground structure eliminates the influence on the adjacent ground, shortens the construction period, eliminates vibration, and reduces noise. This technology relates to a technology that can reduce obstacles, make it easier to remove obstacles on the earth retaining part, and can be used in narrow spaces.

  The conventional earth retaining method is generally a method that involves steel sheet piles, H steel, etc. with driving and drawing (for example, see Non-Patent Documents 1 and 2). For this reason, when the adjacent land is close to the earth retaining, Disadvantages associated with vibration and noise are pointed out.

In addition, when the volume of the struck object was pulled out, voids were created in the soil, which caused an influence on the adjacent ground.

In addition, there is a disadvantage that it takes a construction period because it is necessary to perform once-in-place construction, once the construction is interrupted, and after the foundation structure and backfilling are completed, the drawing work is performed again.

And the equipment used is relatively large, the vibration noise is likely to increase, and it is difficult to work in a small site.
Professional Course Architectural Construction (2nd Edition) 5.2.3 See page 30-33 Yamazuchi Construction Method Kensaku Fukuda + Ryoichi Watanabe Gakugei Shuppan Co., Ltd. issued on March 30, 2004 Building construction textbook 4th edition 5.4 Refer to pages 51-54 for hill retaining works. Published by Shokokusha July 10, 2006.

  For this reason, the present invention eliminates the influence on the adjacent ground, eliminates vibrations, reduces noise, shortens the construction period, and easily removes the obstacles corresponding to the earth retaining part by a simple construction method along the planned underground structure. The purpose is to be able to work on a small site.

  The iron temporary frame box is made by cutting down the ground on the adjacent ground side by the weight of the iron temporary frame box while letting the lead steel settle down first and guiding it to the lead steel along the width of the earth retaining thickness and a certain interval from the foundation structure. As the soil is excavated, it is allowed to settle down to a predetermined depth, and the structural steel and reinforcing bar are assembled in the steel temporary frame box, the foundation base and the retaining wall concrete are driven in, the iron temporary frame box is pulled out, and cast in the ground. Creating and continuing L-shaped structures.

  In order to achieve the above-mentioned purpose, the lead steel 6 (FIGS. 3 and 4) is first settled along a certain distance (the thickness of the retaining wall) from the foundation structure and guided to the lead steel while the iron temporary frame box ( 1 and 2) are excavated in the manner of excavating a hole in the excavation portion 12 (Figs. 3 and 4) for earth retaining work, in which case the adjacent ground side ground 11 (Figs. 3 and 4) is replaced by an iron temporary frame box. Because it sinks while cutting the ground, and the steel plate 2 of the iron temporary frame box prevents the soil from collapsing, the influence on the adjacent ground is eliminated.

Also, when sinking the iron temporary frame box, removal of underground obstacles can be easily removed.

After that, the steel plate temporary frame box is allowed to sink to a predetermined depth, the structural steel material 7 (FIGS. 3 and 4) is press-fitted into the iron temporary frame box, and the pre-assembled reinforcing bars 8 (FIGS. 3 and 4) are assembled. The side wall L-type earth retaining concrete base part 9 (Figs. 5, 6 and 7) is casted concrete and backfilled to the top of the iron plate 3 (Fig. 3) of the iron temporary frame box. Place the lower part of the vertical part of the earth retaining concrete, and pull out the steel temporary frame box to the lower part where it was just placed, let the soil act as a temporary frame, refill this, put concrete, pull out the steel temporary frame box By repeating the work and placing concrete up to the entire L-shaped retaining concrete vertical part 10, that is, the ground surface (the situation of FIGS. 5, 6, and 7) Gap, the size of the specific gravity of the concrete (the heavier the soil), the fluidity is filled under pressure, is no longer the influence of the neighboring land ground.

In addition, this L-shaped concrete soil retainer 14 (FIGS. 8 and 9) is spaced by one sheet, and after the portion 14 is finished, the same L-shaped concrete soil retainer 15 is disposed between the portions as shown in FIGS. Since this series of operations is performed by an excavator (backhoe) so that the entire L-type earth retaining concrete is continued, there is no vibration due to driving and pulling out, and noise can be greatly reduced.

Furthermore, because of the work on the excavator, work can be done without using large equipment, and work in narrow spaces is easy.

  Hereinafter, an example of the present invention will be described with reference to the drawings. First, the iron temporary frame box used in the present invention will be described with reference to FIGS. As shown in the figure, the steel plates 2, 3 and 4 form a cylindrical shape having a rectangular cross section, and are not vertically arranged. Moreover, the wire 1 (FIG. 1) for suspending an upper part is installed. The iron plate has a required depth and a thickness that can withstand earth pressure depending on the ground conditions.

  If the water level is high before the earth retaining work is started, the water level is lowered from the bottom of the root cutting. And the lead steel 6 (Figs. 3 and 4) is first settled along a certain interval (thickness of the retaining wall) of the iron temporary frame box from the foundation structure and guided to the lead steel, for the soil retaining work. Excavation is performed in the manner of excavating a hole in the excavation portion 12 (FIGS. 3 and 4), and at that time, the iron temporary frame box sinks in the portion of the adjacent ground side ground 11 (FIGS. 3 and 4).

Also, when sinking the iron temporary frame box, if there are any underground obstacles, remove them while excavating.

Thereafter, the iron plate temporary frame box is allowed to sink to a predetermined depth, the structural steel material 7 (FIGS. 3 and 4) is press-fitted into the iron temporary frame box, and the rebar assembly 8 (FIGS. 3 and 4) assembled in advance is incorporated.

Then, the L-type earth retaining concrete base part (Fig. 5) was cast in less time, and it was backfilled up to the upper part of the iron plate 2 of the iron temporary frame box (Fig. 3). Place the part and pull out the steel temporary frame box to the lower part where it was just placed, repeat this backfilling, L-type earth retaining concrete vertical part placement, and pull out the iron temporary frame box, and cast the concrete to the ground surface. (Situation in FIG. 3).

Further, the L-shaped concrete earth retaining primary 14 (FIG. 9) is constructed with an interval of one sheet.

After the L-type concrete earth retaining primary 14 is hardened, the joint portion of the partial L-type concrete earth retaining secondary 15 and 14 between them is covered with the panel temporary frame 16 as shown in FIG. The entire L-shaped earth retaining can be continued simultaneously with the concrete placing.

FIG. 10 shows the situation after culling and finishing the chestnut bed 17, the sutecon 18, the foundation structure base 19, the foundation structure pillar 20, and the foundation structure underground beam 21 as a reference after the construction work.

The present invention is used in building foundation construction and civil engineering foundation construction.

  Iron temporary frame box elevation   Iron box longitudinal section   Vertical section after structural steel and rebar assembly after drilling to desired position   Horizontal sectional view of FIG.   Vertical section at the end of the earth retaining concrete (before pulling out the iron temporary frame box)   Upper horizontal section of FIG.   Lower horizontal sectional view of FIG.   Horizontal sectional view when connected   Connection explanation top view   Reference cross section after earth retaining work showing an example

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Hanging wire 2 Next ground side iron plate of an iron temporary frame box 3 Ironing side iron plate of an iron temporary frame box 4 Lateral side iron plate of an iron temporary frame box 5 Ground surface soil surface (GL)
6 Steel for lead 7 Structural steel 8 Reinforcing bar 9 L-type retaining concrete base part 10 L-shaped retaining concrete vertical part 11 Adjacent land side ground 12 Excavation part 13 for soil retaining work Lumping side ground 14 L-type concrete earth retaining primary 15 L-type concrete earth retaining secondary 16 Panel panel 17 Kurashiki 18 Stecon 19 Base structure base 20 Base structure pillar 21 Base structure underground beam

Claims (1)

  The lead steel is first settled along the width of the earth retaining thickness and a certain distance from the foundation structure and guided to the lead steel, while the ground of the adjacent ground side is shaved by the weight of the iron temporary frame box, Sink down to a predetermined depth with excavation, and put structural steel and reinforcing bar into the steel temporary frame box, drive the foundation base and retaining wall concrete, pull out the steel temporary frame box, cast in-place L-shaped concrete in the ground Earth retaining method characterized by creating a structure

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