JPH0649982B2 - Construction method of underground structure - Google Patents

Description

The present invention relates to a method for constructing an underground structure such as a basement of a general house.

[Prior Art] Conventionally, when constructing underground structures such as a basement of a general house, a cut-out garage, a domestic pool, an underground water tank, and an underdrain, a steel sheet pile is driven around the construction site and the steel sheet pile is directly attached. The supporting waving is fixed in the horizontal direction inside the steel sheet pile, and the burrs are fixed at right angles to the digging for earth retaining at the excavation site, and the excavation machine excavates to a predetermined depth. The bottom of the mold with cocrete, and then the mold is erected on the bottom of the mold and concrete is poured into the mold, and after solidification, the mold, steel sheet pile, and upset,
An underground opening was formed by removing the shavings, and the underground structure was constructed by performing a predetermined construction depending on the purpose.

[Problems to be Solved by the Invention] However, with the above-mentioned conventional method, construction cannot be carried out in a place where construction heavy equipment such as a crane truck, steel sheet pile driving machine, and excavator cannot be carried in, and the construction heavy equipment can be temporarily carried in. However, there is a problem that it takes time to carry in and out, and especially in a residential area, it is difficult to construct because there is often little space with the adjacent land, and noise and vibration pollution are caused during construction. There was a problem of getting up.

The present invention has been made to solve the above problems, does not use any heavy equipment other than the excavator or belt conveyor, does not provide a construction method for underground structures without the risk of noise and vibration pollution. It is what

[Means for Solving the Problems] The present invention forms a edging concrete portion by arranging a plurality of H-shaped column holding metal fittings on the inner side surface portion at equal intervals on the periphery of the construction ground surface of the structure. One step, while excavating the construction ground surface while inserting the H type support into the H type support holding metal fitting of the edging concrete part and inserting it into the soil, while holding the earth retaining plate also as an outer frame between each H type support holding metal fitting After the second step of fixing the construction and the construction ground surface to a predetermined depth, the floorboard concrete is placed, and the H-shaped column holding metal fittings, H-shaped column and earth retaining plate are buried to the front of the earth retaining plate. The above-mentioned problems were solved by performing the construction in the third step of forming the frame concrete.

[Operation] According to the present invention constructed by the above-mentioned steps, after forming the edging concrete portion, the H-shaped support pillar is fitted and inserted into the digging portion to excavate the edging concrete portion. Also,
Since the H-shaped strut holding metal fitting, the H-shaped strut, and the retaining plate are buried, the implementation can be simplified.

[Embodiment] The first embodiment of the present invention will be described in detail with reference to the drawings.
The step is a step of forming the edging concrete portion 2 on the peripheral edge on the construction ground surface based on the size of the structure 1 to be constructed. That is, the edging concrete part 2 first sets the concrete formwork on the periphery of the construction ground surface based on the vertical and horizontal dimensions of the structure 1 to be constructed, and arranges the reinforcing bars 3 in the concrete formwork. Further, it is not necessary to particularly limit the plurality of H-shaped column holding metal fittings 4 provided on the inner side surface, but preferably, they are arranged vertically at equal intervals of about 1 m, and then concrete is placed in the concrete formwork. 5 is placed so that the front part of the H-shaped support bracket 4 is flush with the concrete 5 surface, and the edging concrete part 2 having the same thickness as the height of the H-supported bracket 4 is placed on the ground surface. To form.

The H-shaped strut holding metal fitting 4 is not particularly limited, but is preferably two equilateral mountain-shaped steels 6 and a slit 9 having a width in which a connecting plate 8 of an H-shaped strut 7, which will be described later, can be loosely inserted in the front longitudinal direction. In order to have the equilateral angle type steels 6 respectively, the inner side surfaces of the equilateral angle type steels 6 are held by the fixing plates 12 while holding the gap portions 11 into which the rear flanges 10 of the H-shaped support columns 7 can be inserted and fixed.
It is formed by proudly fixing one or a plurality of anchor streaks 13 to the rear end portion. Further, the height of the H-shaped strut holding metal fitting 4 is not particularly limited, but preferably 50 cm or more is recommended from the viewpoint of maintaining strength.

Next, as a second step, after the edging concrete 2 is formed on the periphery of the construction ground surface by the first step, H retaining pillars 7 for retaining soil formed of H steel are arranged at the equal intervals. The construction ground is excavated by the excavating machine 15 while being successively inserted into the model prop holding metal fitting 4 and inserted into the soil by using the vibration of the vibration generating device 14 or being pressed by the tip of the excavating machine 15. Enter the process of cutting.

The H-shaped pillar 7 is used as a soil retaining material for the local soil G.
It is made of steel, and the tip is formed as a sharpened portion 16 so that it can be easily inserted into the construction ground, and a plurality of small holes 18 are formed in the front flange 17 in two rows in the longitudinal direction at equal intervals. Has been formed.

Then, the connecting plate 8 of the H-shaped strut 7 is fitted and inserted into the slit 9 of the H-shaped strut holding fitting 4 of the edging concrete portion 2, and the rear flange 10 is fitted and inserted into the gap portion 11 to form the H-shaped strut 7. It excavates with the excavator 15 while inserting it into the construction ground surface. At this time, if the ground is hard, it is recommended to excavate it while pouring water with the zet pump 19 as necessary.

When the excavated area expands, the earth and sand are prevented from being broken between the H-shaped columns 7, and the earth retaining plate 21 that also serves as the outer form of the frame concrete 20 is flush with the front flange 17 of the H-shaped columns 7. Secure so that There are various fixing means for the earth retaining plate 21, but in the embodiment of the present invention, a pipe 23 having a small diameter is fitted into a pipe 22 having a large diameter so that the length thereof can be freely adjusted. With each pipe 2
Small holes 18 drilled in each H-shaped column 7 at the outer ends of 2, 23
A stop plate furring strip 25 is formed by providing a bolt receiving portion 24 in which a bolt is inserted and the earth retaining plate 21 can be pressed and fixed from the front.

In addition, for example, the H-shaped support columns 7 may be attached to the respective H-shaped support columns 7 as needed.
It is not necessary to specifically limit the case where the vibration generator 14 is placed, the case where it is used as a foot stand for work, etc., but it is preferable to mount the bracket on the right triangle as shown in FIG. 26 and the through holes 28 formed in the vertical plate 27 of the pedestal bracket 26 at the same intervals as the small holes 18 formed in the H-shaped support 7, and the H-shaped support 7 is bolted.
It is used by fixing it to the front surface of the (Fig. 1).

When the construction ground is excavated to a predetermined depth in the second step, the finishing step of the third step is started. That is, in the third step, after placing the floor slab concrete 29, side wall reinforcement is applied to the front surface of the earth retaining plate 21 which also serves as the outer formwork, and the inner formwork or slab is set to make the frame waterproof concrete formwork. The construction is completed by pouring it inside to form the skeleton concrete 20, and the H-shaped column holding metal fitting 4, the H-shaped column 7 for earth retaining and the earth retaining plate 21 are buried.

[Effects of the Invention] Since the method of the present invention is as described above, since the edging concrete portion is fixed to the peripheral edge of the construction ground surface, and the H-shaped support is inserted and implanted in the edging concrete portion, The strength around the construction ground is maintained, there is no need for conventional cutting and cutting, and there is no need to use heavy machinery other than a belt excavator and belt conveyor, so there is no risk of noise or vibration pollution. Since the H-shaped strut holding metal fitting, the H-shaped strut and the retaining plate are buried, the construction can be simplified, which can greatly contribute to the shortening of the construction period and the reduction of the construction cost.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a schematic explanatory view showing a construction state, FIG. 2 is a perspective view after construction is completed, FIG. 3 is a partially enlarged perspective view of the same part, and FIG. 4 is a edging concrete. FIG. 5 is an enlarged perspective view of an H-shaped support bracket, and FIG. 6 is an enlarged perspective view of an H-shaped support.
FIG. 7 is an exploded enlarged perspective view of the furring strip material for the stop plate, and FIG. 8 is an enlarged perspective view of the frame bracket. In the figure, 1 is a structure, 2 is a edging concrete part, 4 is an H-shaped support fixture, 7 is an H-shaped support, 20 is a skeleton concrete, 21 is a retaining plate, and 29 is a floorboard concrete.

Claims (1)

[Claims] 1. A first step of forming a edging concrete portion by arranging a plurality of H-shaped column holding metal fittings on the inner side surface portion at equal intervals on the periphery of the construction ground surface of a structure, and H of the edging concrete portion. While inserting the H-shaped support pillar into the mold support bracket and inserting it into the soil, excavate the construction ground surface,
The second step of fixing the earth retaining plate that also serves as the outer frame between the H-shaped column holding metal fittings, after excavating the construction ground surface to a predetermined depth, placing the floor slab concrete, and further the H-shaped column holding metal fittings, A method for constructing an underground structure, which comprises performing a third step of burying an H-shaped support pillar and an earth retaining plate and forming a skeleton concrete on the front surface of the earth retaining plate.