JPS6121218A - Constructing method of ground improvement - Google Patents

Abstract

PURPOSE:To reduce the cost of construction, by a method wherein a suction apparatus for penetrating soft surface soil layer to intermediate superior layer is provided and superior layer earth is suck up at an overload section via the suction apparatus and surface soil layer is covered with the superior layer earth. CONSTITUTION:A slot through soft surface soil 1 to intermediate superior layer 2 is bored, and a feed and suction pipe 4 is inserted into a bored slot 3. Then, the superior earth 6 for the superior layer 2 is suck up at an overland section via a pump 5, and the surface soil layer 1 is covered with the superior earth 6 via the feed and suction pipe 4, a belt conveyor, a dump truck, or the like, and the surface soil layer 1 is replaced with the superior earth 6.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a soil improvement method in which an intermediate layer containing high-quality materials exists below a topsoil layer that requires soil improvement, including a soft layer, sludge, waste, etc.

Conventionally, this type of improved construction method involves large-scale excavation work, which requires temporary roads to ensure the access of construction machinery and the delivery of construction materials, which lengthens the construction period and increases construction costs. There was a problem.

The present invention has been proposed to solve these problems, and includes a suction device that penetrates the soft topsoil layer and reaches the middle quality layer at the bottom of the layer. The present invention relates to a ground improvement method characterized in that the soil of the intermediate good quality layer is sucked up to the ground surface and deposited on the soft topsoil layer.

In the present invention, as described above, the soil suction device is disposed so as to penetrate through the soft topsoil layer and reach the intermediate good quality layer of one part of the same layer, and the suction device removes the soil of the middle good quality layer from the upper surface layer. This method improves the soft ground by siphoning it up and covering it on top of the soft topsoil layer, replacing the topsoil layer with sand and sand from an intermediate layer of good quality.

Therefore, according to the present invention, it is only necessary to perform the drilling work to place the suction device into the ground, and large-scale construction machines etc. are not required, and it is necessary to carry out the passage of the machines, carry in construction materials, etc. This eliminates the need for temporary roads, making construction easier and improving construction efficiency. In addition, it is possible to secure the construction area within the construction area without having to bring in road flooring materials and foundations for buried objects.

Furthermore, according to the present invention, since the soft topsoil layer is replaced with sand from the middle good quality layer of the same layer, the need to bring in a small amount of good quality sand for the topsoil covering T becomes unnecessary, and dust, defective soil, etc. are removed from the ground. It is possible to push it deeply into the ground by securing a high quality development site with a top soil base with good drainage. Furthermore, the present invention has many advantages, such as improving the soil quality near the ground surface, increasing the lateral resistance of piles, and making it possible to design foundation piles with excellent economic efficiency.

The present invention will be described below with reference to the illustrated embodiments.

In Figure 1, (1) is a soft layer, a topsoil layer containing sludge and other garbage, and (2) is an intermediate quality layer at the bottom of the same layer.

A small hole is drilled through the topsoil layer (1) to reach the middle quality layer (2), and a suction pipe (4) is installed in the drilled hole (3).
The high-quality soil (6) of the intermediate high-quality layer (2) is sucked up to the ground surface through the pump (5), and the high-quality soil (6) is transferred to the above-mentioned feed/suction pipe (4) or belt conveyor/dump. The ground is improved by covering the topsoil layer (1)-F with soil 1 and replacing the topsoil layer (1) with a layer of high-quality soil (6) via a transportation and leveling device such as a truck.

According to the method of the above embodiment, only a small-scale drilling operation for inserting the feed/suction pipe (4) is required, without the need for large-scale excavation work as in the conventional method, and large construction machines, etc. This eliminates the need for temporary roads for the passage of the machinery and the delivery of construction materials, reducing construction time and construction costs. In addition, the soft topsoil layer (1) is the middle good quality layer (2) below the same layer (1).
), it eliminates the need to bring in a small amount of high-quality soil for topsoil lining, and it is possible to push discarded trash, defective materials, etc. deep into the ground, creating a surface soil with good drainage. is maintained.

Figure 2 shows the case where the suction pipe (4) penetrates diagonally across the topsoil layer (1) and the middle quality layer (2), and Figure 3 shows the case where the topsoil layer (1) and the middle quality layer are penetrated in the diagonal direction. A vertical hole (7) was excavated across the layer (2), and the tip of the suction pipe (4) was inserted horizontally into the vertical layer (2).

In FIGS. 2 and 3, parts that are equivalent to the embodiment shown in FIG. 1 are given the same reference numerals.

Although the embodiments of the present invention have been described above, the present invention is, of course, not limited to these embodiments, and can be modified in various ways without departing from the spirit of the present invention. .

[Brief explanation of drawings]

FIG. 1 is a longitudinal cross-sectional view showing the implementation status of one embodiment of the soil improvement method according to the present invention, and FIGS. 2 and 3 are longitudinal cross-sectional views showing the implementation status of other embodiments of the method of the present invention, respectively. It is. (1) ... Topsoil layer, (2) ... Intermediate quality layer, (4)
...Suction pipe, (5) ...Pump, (6) ...High-quality earth and sand agent Patent attorney Shige Okamoto 3 other people

Claims (1)

[Claims] A suction device is provided that penetrates the soft topsoil layer and reaches the middle good quality layer at the bottom of the same layer, and the soil in the middle good quality layer is sucked up to the ground surface through the suction device and covered with soil on the soft topsoil layer. A ground improvement method characterized by: