JPH0467533B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a construction method for underground structures such as basements of buildings.

Problems to be Solved by the Prior Art and the Invention In general, the following structures such as basements require a lot of effort and cost to construct. Moreover, the underground pine slab and earth retaining wall need to have rigidity and water-stopping performance, so it is necessary to deal with earth pressure and water pressure by making them double-layered to treat spring water, and by installing thick slabs and highly rigid beams. Currently, most of the construction is done using cast-in-place concrete.

This invention was developed to provide a construction method that makes it easier to form drainage ditches by using precast plates, reduces the need for formwork, etc., and can also be used to stop water by simply treating the joints. It is.

Means for Solving the Problems This invention involves constructing an underground continuous wall using soil improvement columns or the like on the outer periphery of a basement to be constructed, cutting the roots of the ground inside the wall, and then cutting the roots at the bottom of the foundation floor. Arrange reinforcing bars and place matte concrete, then install a precast slab with a reverse slab-like cross section with drainage grooves on top of it, lay keystone plates, etc. on top of it, and pour concrete to complete the slab. This is a construction method for underground structures in which a precast slab that also serves as formwork is installed inside the continuous wall, and reinforced concrete is poured between the continuous wall and the precast slab that also serves as formwork.

Embodiments Hereinafter, embodiments of the present invention will be described with reference to the drawings. First, an underground continuous wall 1 is constructed on the outer periphery of the basement where construction is planned using soil concrete or other ground improvement columns, and then the root of the inner ground is cut, and level-adjusted concrete is placed at the bottom of the cut. 2. Next, reinforcing bars 3 are placed thereon and matte concrete 4 is poured. A precast concrete plate 6 having a reverse slab-like cross section with a drainage groove 5 and protruding ribs 6a and shear reinforcing bars 6b is installed on the mat concrete 4. Further, the U-shaped grooves 7 are arranged in reverse order to form a drainage ditch on the outer periphery of the basement.

Next, wall reinforcing bars 8 are arranged inside the continuous wall 1, and a precast plate 9 serving as a formwork with ribs 9a and shear reinforcing bars 9b protruding is erected, and supports 10 are placed.
The construction is adjusted according to the construction method, reinforcing bars 11 are placed between the continuous wall 1 and the precast slab 9 which also serves as formwork, and concrete is poured.

In addition, a keystone plate 12 is laid on the precast concrete slab 6 on the pine slab, mesh reinforcements 13 are arranged, and the concrete floor 1
4.

Further, a precast plate 15 serving as a formwork for the upper floor is placed over the precast plate 9 serving as a formwork, and concrete 16 is poured thereon to construct a composite floor.

Effects This invention has the above-mentioned configuration, and since ribbed precast plates are used for the pine slab and the wall portion of the outer periphery of the basement, rigidity can be increased as required, and water-stopping treatment can also be applied to the joints. The rigidity and water-stopping performance required for underground structures can be easily ensured.

Also, drainage bits and drainage grooves can be easily formed on the pine slab.

In addition, since precast plates that also serve as formwork are used during construction, it is possible to save labor on site, shorten the construction period, and reduce the amount of reinforcing bars and concrete.

[Brief explanation of drawings]

Figures 1 and 2 are longitudinal sectional views showing an overview of the construction process of this invention, Figures 3 and 4 are cross sectional views of the continuous wall section in the construction state, and Figures 5 and 6 are pine slabs. FIG. 3 is a longitudinal cross-sectional view of the section and the wall section; 1... underground continuous wall, 2... discarded concrete,
3...Reinforced steel, 4...Matsuto concrete, 5...
Drainage ditch, 6... Precast concrete version, 7
... U-shaped groove, 8 ... Reinforcement bar, 9 ... Precast version that can also be used as formwork, 10 ... Support, 11 ... Reinforcement bar, 1
2...Keystone plate, 13...Mesh reinforcement, 14...Concrete floor, 15...Precast plate that also serves as formwork, 16...Concrete.

Claims (1)

[Claims] 1. Construct a continuous wall around the outer periphery of the basement, cut the roots inward, then arrange reinforcing bars at the bottom of the foundation floor, pour concrete, and install a precast slab with drainage channels on top of it. A pine slab is formed, a precast slab that also serves as formwork is installed inside the continuous wall, reinforcing bars are placed between the continuous wall and the precast slab that also serves as formwork, and concrete is poured. A construction method for underground structures characterized by placing a concrete floor on a precast slab.