JPS63201217A - Construction of beam buried in ground - Google Patents

Abstract

PURPOSE:To construct a foundation without effected by building, etc., on the ground's surface by a method in which a path to connect excavated pits under the ground is provided, and reinforced concrete is placed into the space of the path. CONSTITUTION:A pair of pits 2 and 2a are excavated in both sides of a path 1 which is a general purpose use, and an excavating pipe is driven between the pits 2 and 2a one of which is starting pit and the other is an arrival pit, forming communicating paths 3 and 3a. A stand pipe 4 vertically crossing the path 3 is driven and a foundation pile 5 is driven into the bottom of the pipe 4. Reinforced concrete is placed into the paths 3 and 3a to complete the foundation work. A structure 6 can thus be constructed even when buildings, etc., are present in the surrounding.

Description

DETAILED DESCRIPTION OF THE INVENTION A. Field of Industrial Application The present invention relates to a method of constructing a beam in a buried state when a rigid frame structure or a foundation beam, etc. classified as 4I with columns and beams, is formed underground. .

Conventional technology Conventionally, in order to construct underground beams, a space for construction is formed underground using the open-cut construction method or the earth retaining method, and the beam is constructed in that space. They were backfilling the area.

C. Problems to be solved by the invention In order to implement the plain excavation method and the earth retaining method, it is not only necessary to secure a large area for construction on the ground, but also the noise and vibrations generated by the excavation work are large in the surrounding area. This has a major impact on the ground and structures of the area. In particular, when constructing elevated double-track railways and roads or constructing narrow sites due to active urban redevelopment, existing roads, railways, rivers, Naturally, it is expected that there will be buildings, etc., and in that case, temporary temporary construction work will be carried out to detour the area, or large-scale auxiliary construction work such as temporarily relocating and returning to the original place after the construction is completed, etc. It will be necessary to occupy a vast amount of land. Especially if it is a route that is currently being operated by a railway.
This may obstruct the operation of the train, make significant time changes, make operation regulations such as driving slowly, or force emergency work to be carried out at night.

2. Means for solving the problem The present invention is a method for constructing underground beams that can be constructed inexpensively and in a short period of time by significantly reducing the impact on the ground and surrounding areas without excavation. Its structure consists of providing a horizontal communication path underground that connects the dug vertical shafts, and pouring reinforced concrete into the hollow part of the communication path.

E. The horizontal communication passage connecting the working shafts can be formed without regard to the conditions on the ground, simply by opening the entrance of the combing to the ground, and the hollow part itself serves as a formwork. Therefore, the reinforced concrete that is poured into it is left as is and does not require any post-treatment.

Embodiment Next, an embodiment of the method for constructing a beam according to the present invention will be described with respect to a rigid frame structure constructed in double-track construction of an elevated railway constructed parallel to an above-ground commercial line.

First, on both sides of the commercial route 1, a pair of combs 2.2a are dug at predetermined intervals in two locations that have little impact on the ground. The depth of this combing should be ensured at least to the position of the buried beam, and if there are multiple beams, this position will be the position of the deepest beam. If the ground between the combs does not have sufficient strength,
Zero-order vertical shaft 2 where ground improvement treatment is performed by injecting chemical solutions, etc.
．． Assuming that one side of 2a is the starting combing and the other is the final combing, drive a propulsion tube (huyum tube) corresponding to the thickness of the beam from the starting combing toward the final combing, and make the inside of the propulsion tube hollow. A communication path 3 is formed. At the same time, there are communication paths 3a, 3 in other combing gaps 2.2 or 2m, 2a (direction perpendicular to the line).
0 Next, stand pipes 4.4 perpendicular to the communicating path 3 in the vertical direction are driven vertically into the designated areas and into the combing, if piling is required due to ground conditions. At the same time as the stand pipe 4 is being driven, the foundation piles 5 are leveled and driven into the bottom of the stand pipe 4.

As a result, a framework of a hollow rigid-frame structure is formed in the ground above the foundation piles 5 that have been driven, consisting of columns formed by the vertical holes formed by the stand pipes 4 and beams formed by the communication passages 2 and 2a. Reinforcing steel is placed in the hollow area, and concrete is poured and reinforced concrete is placed. Once the concrete has hardened, a foundation consisting of a rigid frame structure is completed underground, and the above-ground structure is continuously built on top of that foundation. Build object 6.

In this way, there will be no large vibrations and no large-scale excavation work will be required, except when driving stand pipes or driving foundation piles, so construction work can be carried out regardless of structures on the ground, roads, rivers, etc. However, the impact on the surrounding ground and buildings is extremely small, and since such auxiliary work is no longer required, the construction period is low, the construction period is short, and construction can be carried out even during daytime business hours.

In the above embodiment, the communication path is a propulsion tube (Hyum tube).
Although the tunnel was formed by driving, it is also possible to adopt a tunnel construction method in which the tunnel is formed by sheet piles with H shoring as the axis, which makes it easy to demolish them. In addition to forming a vertical hole by driving a standpipe, it is also possible to excavate it downward from the ground surface or upward from within a communication passage, or by using the propulsion method from the bottom upward. The number of holes, their cross-sectional shape, above-ground structures, etc. can be changed as appropriate depending on the construction purpose, and the number of pile driving operations and the formation of vertical holes perpendicular to the communication path may be increased, decreased, or omitted depending on the structure and ground conditions. Can be done.

G. Effect According to the construction method of the present invention, existing roads, railways,
Even if there are rivers, buildings, etc., there is no need for temporary temporary construction work or auxiliary work such as relocation, and the impact on surrounding buildings and ground is extremely small, so it is an existing building.

Foundation work underground for structures that are installed parallel to or intersecting with commercial routes does not affect anything above ground, and can be carried out simultaneously with other above-ground construction work that is unrelated to the foundation work. The benefits brought about by urban redevelopment in the future are enormous.

[Brief explanation of the drawing]

The drawings show the construction method according to the present invention in the order of steps,
Figure 1 is an explanatory diagram showing the state in which the leveling comb has been dug, Figure 2 is an explanatory diagram showing the state in which the dug shafts are connected by a communicating passage, and Figure 3 is an explanatory diagram showing the communicating passage and the shaft. FIG. 3 is an explanatory diagram showing a state in which a hollow frame of a rigid frame structure is formed. Figure 4 is an explanatory diagram showing the foundation of a rigid-frame structure completed by driving foundation piles down the shaft and pouring reinforced concrete into the hollow framework. It is an explanatory view showing a state where a building is constructed. l...Business route, 2.2a...Smoothing, 3.3a...Communicating path, 4...Stand pipe, 5...Foundation pile, 6...Ground structure

Claims (1)

[Claims] 1. Construction of an underground beam characterized by providing a horizontal communication path that connects dug vertical shafts underground, and pouring reinforced concrete into the hollow part of the communication path. Method. 2. Construction of an underground beam according to claim 1, wherein the communicating path forms a frame shape of a rigid frame structure consisting of a hollow part underground by a vertical hole orthogonal to the communicating path. Method.