JPS6040434A - How to build underground structures - Google Patents

Abstract

PURPOSE:To shorten the period of construction as well as reduce the cost thereof by a method in which side walls and the surrounding earth pressures are supported by water stored on the excavated side of an underground structure buried in the ground, slab is orderly formed on them from above to below while lowering the level of water. CONSTITUTION:A formwork is set on the ground's surface, concrete is placed into the formwork to form an underground structure A. While supporting the four- side walls 1 of the structure A by beams 2, water jet is jetted from the lower end and the structure A is settled into the ground with reaction of the stage, etc. Water B is stored to a given level on the excavated side of the structure A to support earth pressures to the side walls 1, and underwater concrete 4 is placed on the bottom and hardened. Afterwards, deck plates are placed on the beams 2, concrete is poured to form slab 3a, and while supporting the earth pressures by the slab 3a and lowering the level of water in order, slabs 3b, 3c... are orderly formed. The water on the final excavated side is drained by a pump. The effect on the surrounding earth pressures can thus be lessened, and therefore, the period and cost of the construction work can be reduced.

Description

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

BACKGROUND ART When root cutting and underground framework work is carried out on ground with a high groundwater level, the conventional temporary walls, shears, drainage facilities, etc. that are used as temporary structures put pressure on the construction period and cost. The reason why underground construction is considerably more expensive than above-ground construction is the expense involved in this temporary construction.

Analyzing these from a technical perspective, an important reason is that most of the construction work in the current underground framework construction is based on dry work, and the fact that the root cut 1111 is made dry is the main reason. ``It floats as `` two come.

Purpose of the Invention The present invention has been made to improve the conventional problems as described above, and it is a method to actively use water, which has conventionally been treated in the direction of being eliminated by various construction methods in the construction of underground structures. The purpose of this invention is to shorten the construction period and reduce the construction cost.The method of constructing an underground structure according to the present invention is to reduce the construction period and cost. The above purpose is achieved by storing water and supporting the surrounding earth pressure with the fFl wall of the underground structure main body by waterproofing, forming a slab from the upper part and lowering the water level5 to form a further lower slab. .

EXAMPLES Hereinafter, the present invention will be explained in detail based on examples shown in the drawings.

In the figure, A is the main body of the underground structure, which is formed by pouring concrete into a formwork set above ground. Jet water is ejected from the bottom of the structure using underground water, and the reaction force is applied to the gantry. It was sunk underground. Underground structure body A
In this example, four side walls 1 are supported by beams 2.

Water B is stored on the root cutting side of the underground structure main body A. Water B naturally infiltrates into the underground structure body A in areas where the groundwater level is high. If the water level is low, inject it to reach a predetermined water level. This water B supports the surrounding earth pressure applied to the side wall 1 of the underground structure main body A.

Under the above conditions, underwater concrete 4 is placed at the bottom of the main body A of the underground structure (Fig. 1). After the underwater concrete 4 has hardened, the slab 3 is formed on the beam 2 starting from the top of the main body A (Figures 2 and 5). Formed by laying concrete on top.

A slab 5a on the first floor above ground is formed (Fig. 2). Next, b is formed on the slab on the first basement floor, but the water level is at slab 5b.
The water level is lowered below the beam 2 because the bridge is above the girder 2. Even if the water level is lowered, since the slab 5a has already been formed, it is possible to sufficiently support the surrounding earth pressure with the slab 3a.

After lowering the water level, a deck plate is attached to the beam 2 to form a crossing slab 3b. (Fig. 5) As described above, the slab 5 is formed to support the surrounding earth pressure and lower the water level.
Repeat the process of forming 14 rows.

After forming the slab directly above the lowest floor, water accumulated on the cut side of the underground structure main body A is drained by a pump. (
(Figure 4) Effects of the Invention This invention has the above-mentioned configuration, and because it uses water such as groundwater to support the surrounding earth pressure, there is less temporary construction work such as retaining walls and shedding, and the construction period can be shortened. It is possible to significantly reduce underground construction costs. In addition, there is no need to constantly pump up groundwater, so there is little impact on the surrounding earth pressure.

[Brief explanation of drawings]

FIGS. 1 to 4 are longitudinal cross-sectional views of a biliary system constructed in accordance with an embodiment of the present invention. A...Main body of the basement, B...Water, 1...Side wall, 2. ,
Beam, 3 (a, b, c), - slab, 4... underwater concrete

Claims (1)

[Claims] Water is collected on the root cutting side of the underground structure buried underground, and by waterproofing it supports the surrounding earth pressure along with the side walls of the underground structure body, forming a slab from above and lowering the water level.
0, which relates to a method for constructing an underground structure characterized by further forming a lower slab.