JPH04247126A - Construction works for underground structure - Google Patents

Abstract

PURPOSE:To shorten the term of construction and lower costs by constructing land slide protection walls, individual continuous walls and individual pits underground until they come down to a support ground, and thereby using these construction members as the outer walls, the bearing walls and the columns of an underground floor. CONSTITUTION:Individual continuous walls 2 and individual pits 3 are constructed in the inner sides of land slid protection walls 1 until they come down to the depth of a support ground by means of poured reinforced concrete. In this case, ready-made pits such as PC pits and steel pits may be used as the pit 3. The land slide protection walls 1, the continuous walls 2 and the pits 3 are made to function as the foundation of a structure, and they can concurrently be used as the outer walls, the bearing walls and columns of an underground structure. By this constitution, the execution of construction can be simplified, and cost can also be lowered.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention This invention relates to a method for constructing underground structures.

0002

BACKGROUND OF THE INVENTION Various methods have been used to construct underground structures. Most of these involve root cutting work that involves digging deep beneath the ground surface. Root cutting work requires a lot of supporting materials such as retaining walls and cut beams, and a lot of manpower. Furthermore, not only is the construction period unavoidably long, but the work is carried out below the ground level, which is very dangerous.

[0003] This invention was proposed in order to solve the above-mentioned problems of the prior art, and its purpose is to provide a construction method for underground structures that enables short-term construction and safe construction. .

0004

[Means for Solving the Problems] In order to solve the above problems, the method for constructing an underground structure according to the present invention is such that a retaining wall is used as the outer wall of the basement floor, an independent continuous wall is used as the load-bearing wall of the basement floor, and , construct an underground structure using support piles as pillars of the basement floor.

[0005]

[Embodiment] The present invention will be explained below based on an illustrated embodiment. Figs. 1 to 7 show a method of constructing an underground structure according to the present invention. In the figures, number 1 indicates a retaining wall, 2 is an independent wall, and number 3 is a support pile.

[0006] The construction method will be explained step by step below.

[0007] First, a retaining wall 1, an independent wall 2, and a support pile 3 are constructed in the ground using the ground surface as a working floor. The retaining wall 1 serves as the outer wall of the underground structure, and is constructed continuously along the outer periphery of the underground structure. In addition, the independent wall 2 serves as a load-bearing wall for the underground structure, and is constructed integrally with the retaining wall 1 and the retaining wall 3 between the supporting piles 3 and between the supporting pile 3 and the retaining wall 1. do. The support piles 3 serve as pillars of the underground structure, and are constructed with equal spans in the front, back, left and right directions.

Furthermore, in principle, the retaining wall 1, independent wall 2, and support pile 3 are all constructed of cast-in-place reinforced concrete to a depth that reaches the supporting ground, and by providing a foundation portion 3a at the base of the support pile 3. The support strength of the support pile 3 shall be increased as much as possible (see Figure 2). In addition,
The support pile 3 does not necessarily have to be a cast-in-place concrete structure, and ready-made piles such as PC piles and steel piles may be used.

[0009] Subsequently, a steel frame member 4 is erected at the upper ends of the retaining wall 1, independent wall 2, and support pile 3, and the steel frame member 4 is used as an anchor member for the column 5 on the ground floor. The steel frame members 4 shall be made of steel sections such as H-beams or steel pipes such as square steel pipes and circular steel pipes, and the concrete of the retaining walls 1, independent walls 2, and supporting piles 3 should be at least as deep as the first floor underground. The base of the column 5 is completely fixed by embedding it deeply.

[0010] Next, the ground surface is dug to a predetermined depth, and the beams 6 and floor slabs 7 of the first floor are constructed in the dug-out portion. The beam 6 may be a steel beam, a PC beam, or a cast-in-place reinforced concrete beam, and the floor slab 7 may also have a PC board structure or a cast-in-place reinforced concrete structure, but the beam 6 may be a steel beam or a cast-in-place reinforced concrete beam. If the floor slab 7 is made of a beam and the floor slab 7 is made of a PC board structure, on-site construction can be simplified and the construction period can be shortened.

[0011] The reason why the floor slab 7 on the first floor is not made of a flat slab but has a structure in which a beam is provided is to increase the degree of fixation of the base portion of the column 5 and to smoothen the transmission of stress.

[0012] Next, the ground directly below the beam 6 and floor slab 7 that has just been constructed is further dug down to the position of the floor slab on the first basement floor. In such a case, the retaining wall 1 prevents the surrounding slope from collapsing, and the beam 6 and floor slab 7 prevent the retaining wall 1 from collapsing.
There is no need to intentionally install retaining walls or cut beams.

[0013] Subsequently, the root cut bottom is made flat, and a floor slab 8 for the first basement floor is constructed on it using a cast-in-place reinforced concrete structure or a PC board structure. Furthermore, the floor slab 8 is constructed integrally with the surrounding retaining walls 1, independent walls 2, and support columns 3.

[0014] Next, the ground immediately below the floor slab 8 just created is dug down to the position of the floor slab on the second basement floor. In such a case, the beams 6 and floor slabs 7 on the first floor above ground, and the floor slabs 8 on the first basement floor serve as the cut beams of the retaining wall 1, so there is no need to provide cut beams.

[0015] Thereafter, in the same manner, the construction of the basement floor slab and the ground excavation are performed alternately to construct the basement to the lowest floor, and the floor slab of the lowest floor is made thicker than the floor slab of the intermediate floor. Accordingly, the foundation slab 9 is obtained. Additionally, the ground floor will be constructed in parallel with the construction of the basement floor (see Figures 5, 6, and 7).

[0016]

[Effects of the Invention] Since the present invention has the above configuration, it has the following effects.

[0017] Once the floor slab for the first floor above ground has been constructed, the construction of the basement floor below this can be carried out completely unaffected by the weather.

[0018] ■ The retaining wall that will be the outer wall of the basement floor, the independent wall that will be the load-bearing wall, and the support piles that will be the pillars of the basement floor will all be constructed in the ground, so any formwork work can be omitted. Furthermore, when excavating the ground, each floor slab of the basement floor can be used as a cut beam or support for a retaining wall, so there is no need to intentionally provide a cut beam or support. Furthermore, since the construction of the ground floor can be carried out at the same time as the construction of the basement floor, the construction period can be significantly shortened and the construction cost can be significantly reduced.

[0019] Also, the retaining wall can be used as an outer wall of an underground structure, the independent wall can be used as a load-bearing wall of an underground structure, and
It is extremely economical because the support piles can be used as pillars for underground structures.

[Brief explanation of the drawing]

FIG. 1 is a partial plan view showing one step of the underground structure construction method.

FIG. 2 is a partial vertical sectional view showing one step of the underground structure construction method.

FIG. 3 is a partial vertical sectional view showing one step of the underground structure construction method.

FIG. 4 is a partial vertical sectional view showing one step of the underground structure construction method.

FIG. 5 is a partial vertical sectional view showing one step of the underground structure construction method.

FIG. 6 is a partial vertical sectional view showing one step of the underground structure construction method.

FIG. 7 is a partial vertical sectional view showing one step of the underground structure construction method.

[Explanation of symbols]

1... Mountain retaining wall, 2... Independent wall, 3... Independent pile, 4... Steel frame member, 5... Column, 6... Beam, 7... Floor slab on the ground floor, 8... Floor slab on the first basement floor, 9... Foundation slab.

Claims (1)

[Claims] Claim 1: An underground structure characterized in that the retaining wall is used as the outer wall of the basement floor, the independent continuous wall is the load-bearing wall of the basement floor, and the supporting pile is used as the column of the basement floor. construction method.