JPH089868B2 - Construction method of main slab in underground space - Google Patents

Description

TECHNICAL FIELD The present invention relates to a method for constructing a permanent slab that supports a side surface portion of an underground space during an underground construction for constructing a building.

[Prior Art] Conventionally, in an underground space formed by digging down the ground to construct a building, the abdomen is laterally passed to a sheet pile or the like arranged on the side surface of the underground space to raise the abdomen. The soil pressure around the underground space is supported by connecting the cut soil, and in this underground space where a lot of cut soil is placed, which is angry, further underground work such as digging and foundation work is performed.

[Problems to be Solved by the Invention]

However, as mentioned above, since a large number of cut soil is passed to support the abdomen as described above, lifting work in underground work such as excavation work and foundation work is restricted, and large-sized members such as Because lifting is not possible,
There was an inconvenience that there were restrictions on the underground structure and construction method.

Therefore, in the present invention, it is an object to surely support earth pressure around the underground space and to form an opening portion in which lifting work is easily performed, and an object thereof is to improve work efficiency in underground work.

[Means for solving the problem]

The present invention has been made in consideration of the above problems,
Over the inner circumference of the underground space to be dug down, by precedingly striking the slab that corresponds to the outer peripheral span of the structure to be built in the underground space, by constructing a mouth-shaped main slab that resists earth pressure, It solves the problem.

[Action]

In the present invention, a mouth-shaped main slab is constructed to support earth pressure in an underground space in place of abdominal acclimation and cuts, and an opening is formed in the center of the main slab, and the main slab is formed. The slab is used as a gantry for carrying in, and the lifting work is performed from the opening.

〔Example〕

Next, the present invention will be described in detail based on the embodiments shown in FIGS. 1 to 3.

In the figure, reference numeral 1 is an underground space for constructing an underground portion such as a building, which is formed by digging the inside surrounded by an earth retaining wall 2 such as a sheet pile. Then, while digging down to a predetermined depth, a main slab 4 having a slab 40 and a slab 41 extending over the inner circumference of the underground space 1 is constructed with a plurality of true columns 3 as supports.

The main slab 4 is provided by precedingly striking the slab corresponding to the outer peripheral span of the structure to be built in the underground space 1.
It is provided so as to receive and support earth pressure A around the underground space 1. After constructing the first-floor permanent slab 4 on the highest floor, the lower-floor permanent slab 4 is constructed by sequentially digging down the ground.

By excavating the underground space 1 and constructing the lowest permanent slab, a plurality of permanent slabs 4 support earth pressure around the underground space 1 as shown in FIG. At the center of the space 1, there is formed an open space B formed of the above-mentioned opening 5 in which a conventional supporting portion such as cut rice cake does not exist.

After that, the uppermost permanent slab 4 and the like are used as a gantry for loading, and large members and equipment are hoisted in the open space B to perform underground construction.

Further, since the outer wall portion in the underground space 1 also works as a seismic element, the main slab 4 can be a flat slab as shown in FIG. Since the earth pressure around the slab is particularly large, it is necessary to make the slab thick. However, by using this flat slab, the flat shape can be omitted, and conversely, the main slab 4 which is this flat slab.
Can be used as a gruel, which makes it more economical.

In the open space B, the construction method similar to that on the ground can be selected.

(Effects of the Invention) As described above, according to the present invention, the slab corresponding to the outer peripheral span portion of the structure constructed in the underground space is preliminarily striking over the inner circumference of the underground space to be dug, and the earth pressure is increased. Since a mouth-shaped main slab that resists construction is constructed, an open space is created in the central part of the underground space, so the main slab can be used as a gantry for carrying in, and large parts and equipment can be lifted from the central part. Can be overweight, angry,
It will be possible to significantly reduce temporary costs such as cuts and boarding gantry. For this reason, various methods can be adopted for underground construction without being restricted by cutting and polishing, and efficient work can be performed.

Also, if the main slab is a flat slab, it is possible to reduce the work of formwork, reduce costs and improve workability,
It is also possible to use soil as a formwork. Then, the entire slab becomes a soil that receives earth pressure, and it is extremely effective against bending due to earth pressure, and it has excellent practical effects.

[Brief description of drawings]

FIG. 1 is an explanatory view showing an embodiment of a method for constructing a permanent slab in an underground space according to the present invention, FIG. 2 is an explanatory diagram showing a state in which the permanent slabs are arranged in layers, and FIG. 3 is a book. It is explanatory drawing which shows the other example of an installation slab. 1 …… Underground space 3 …… Structured pillar 4 …… Main slab 5 …… Opening A …… Soil pressure B …… Open space

 ─────────────────────────────────────────────────── ─── Continued Front Page (72) Inventor Toshiyuki Yamada 2-16-1 Kyobashi, Chuo-ku, Tokyo Shimizu Construction Co., Ltd. (72) Inventor Shoji Fukushi 2-16-1 Kyobashi, Chuo-ku, Tokyo Shimizu Construction Co., Ltd. (72) Inventor Norihiro Shoto 2-16-1 Kyobashi, Chuo-ku, Tokyo Shimizu Construction Co., Ltd. (72) Inventor Kazunobu Yamamoto 2-16-1 Kyobashi, Chuo-ku, Tokyo Ken Shimizu (72) Inventor Masami Tozawa 2-16-1, Kyobashi, Chuo-ku, Tokyo Shimizu Ken Co., Ltd.

Claims (2)

[Claims] 1. A mouth-shaped permanent slab that resists earth pressure is constructed by preliminarily striking the slab that corresponds to the outer peripheral span of the structure constructed in the underground space over the inner circumference of the underground space dug down. A construction method of a permanent slab in an underground space characterized by: 2. The method for constructing a main slab in an underground space according to claim 1, wherein the mouth-shaped main slab is a flat slab.