JP2797143B2 - Side hole embedding method - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial applications]

TECHNICAL FIELD The present invention relates to a method for embedding a horizontal hole in a stratum formed by a quarry trace or an air raft shelter to reinforce the ground.

[Prior art]

If there is a horizontal hole due to quarry traces such as Otani stone or air raft shelter, the ground is at risk of collapse and it is necessary to take safety measures. In order to fill this side hole, it is the present situation that a worker enters the site and performs a long time of embedding work using the soil.

[Problems to be solved by the invention]

In the method of embedding with soil, it takes 3 to 5 years for the soil layer to be naturally consolidated and the soil to be stabilized, and during that period it is necessary to prohibit entry to the site, and construction that allows early access The emergence of the law is under way. Also, a method of loading a foam block (900 mm in length, 1800 mm in width, and 450 mm in height) into a side hole and filling a gap between the side hole and the foam block with a urethane graft material is considered as a technique for embedding the side hole. However, it is always dangerous to work in the implantation site, and it is a fact that the operator wants to minimize the working time in the side hole of the implantation site. The present invention has been made in order to solve the above-mentioned problem, and the purpose is to fill the pre-expanded thermoplastic resin particles in the lateral hole by using an air-pumping means instead of embedding work with the soil, and fill the filled hole. A foam molded article formed by heating the pre-expanded thermoplastic resin particles by steam and foaming the particles while simultaneously fusing the particles to each other to fill the side holes, bonding the ground with a foam layer to fill the side holes, and forming the inside of the side holes. It is an object of the present invention to provide an embedding method in which the ground can be reinforced by a layer. According to the method of the present invention, not only the labor saving can be achieved and the operation can be performed safely, but also there is an advantage that the period for compacting the buried layer is not required.

[Means for Solving the Problems]

In order to achieve the above object, a method of burying a lateral hole characterized by the present invention is to partition the space on the back side of the lateral hole such as the quarry mark of Oya stone by a partition plate having a filling port, and then to expand the foaming ratio from the filling port. After 10 to 100 times the pre-expanded thermoplastic resin particles are filled into the space with compressed air, the pre-expanded thermoplastic resin particles are foamed by heating with steam, and the particles are simultaneously fused together. To form a foamed molded article, and then partition the space on the entrance side of the side hole after the foamed molded article is formed with a partition plate having a filling port, and thereafter, filling with pre-expanded thermoplastic resin particles, by steam heating The process of molding the foamed article is repeated, and the lateral hole is filled with the foamed article.

【Example】

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. Using a small boiler, a continuous prefoaming machine with a diameter of 0.5m and a height of 1.5m and a steam supply pipe, first prefoam the foamable thermoplastic resin particles to the desired magnification (10 to 100 times) on site. To obtain pre-expanded thermoplastic resin particles. In this case, as the expandable thermoplastic resin particles, those having a particle size of 0.5 to 5 mm, such as polystyrene, polyethylene, and polypropylene, containing 3 to 20% by weight of a volatile blowing agent such as butane, heptane, and pentane are used. . As shown in FIG. 1 and FIG.
A partition plate 6 such as a veneer plate or a metal plate provided with a filling port 4 and a hole 5 for inserting a steam supply pipe 10 at a position 5 to 6 m closer to the inlet 2 side of the lateral hole 1 is mounted upright. And
A space 3 partitioned from the entrance 2 is formed. As shown in FIGS. 5 and 6, the tip of each of the branch pipes 11 (six in the drawing) is made blind, and the peripheral wall of the branch pipe 11 has a diameter of 0.8.
The branch pipe 11 of the steam supply pipe 10 in which holes 13 of about 2 mm are provided in a staggered manner at a pitch of 10 mm is inserted into the space 3 from the insertion hole 5 of the partition plate 6. On the other hand, the distal end of a hose (not shown) is inserted into the space 3 from the filling port 4 of the partition plate 6, and the base end of the hose is sent to a pressurizing apparatus (not shown) for pre-expanded thermoplastic resin particles by compressed air. After the connection, the pre-expanded thermoplastic resin particles b are supplied into the space 3, and after filling the resin particles b, the hose is pulled out from the partition plate 6, and the filling port 4 is closed with soil, plate, plastic or the like. Next, 0.1 to 4 kg / c is added to the steam supply pipe 10.
m ² steam is supplied, and the pre-expanded thermoplastic resin particles in the space 3 are heated by steam to foam (expand) and fuse to form a foam molded article that fills the space 3 (indicated by f ₁ in FIG. 3). )
Is molded. In this case, the supplied steam has no risk of causing an accident such as an explosion at the construction site since the soil of the ground is permeable and escapes from the ground, and the partition plate 6 is moved by the foaming pressure. If there is a concern, it is desirable to reinforce the outside of the partition plate 6 with reinforcing columns or girders. Next, the third
As shown, after the molding of the foamed molded product f _1, by mounting the partition plate 10 in a portion of the front 5~6m of the foamed molded f ₁ towards the re inlet 2 side of the lateral hole 1, sectioned Next, a space 3 'is formed, and the space 3' is filled with the pre-expanded thermoplastic resin particles b, and a foamed molded article by steam heat (see FIG. 4).
The molding shown in f ₂₎ repeating a required number of times, the inside lateral hole 1 as shown in FIG. 4 so as to be embedded in the foamed molded _{f 1, f 2, f 3} ...... practicing the present invention. In addition, the partition plate 6 and the steam supply pipe 10 are made of a foam molded body f ₁ ,
It is advantageous from the viewpoint of work to be buried in the horizontal hole 1 together with f ₂ , f ₃ ... When it is desired to improve the appearance of the entrance 2 side of the horizontal hole 1 after completion of the embedding work, as shown in FIG. Entrance 2
With the retaining wall 7 and fill the gap inside the retaining wall 7 with earth and sand or quarry 8.

【The invention's effect】

The present invention is as described above, and a foam molded article can be easily obtained from pre-expanded thermoplastic resin particles at a construction site (in a horizontal hole). Then, the obtained foamed molded product has the usual required performance (compression strength of 1.0 kg /
cm ² or more), and there is no fear that the side hole will collapse even if a car moves on the soil layer of the side hole. Also, the filling of the pre-expanded thermoplastic resin particles can be pumped by compressed air,
The time required for an operator to enter the lateral hole for filling the resin particles into the lateral hole is short, which is effective in ensuring work safety.

[Brief description of the drawings]

The drawings show an embodiment of the present invention. FIG. 1 is a side sectional view showing an initial filling molding operation state in a lateral hole, FIG. 2 is a front view of a partition plate, and FIG. FIG. 4 is a side cross-sectional view showing a molding operation state, FIG. 4 is a side cross-sectional view in a state where embedding is completed, FIG. 5 is a perspective view of a steam supply pipe, and FIG. 6 is an enlarged cross-sectional view of a portion A in FIG. In the figure, 1 is a lateral hole, 2 is an inlet, 3 and 3 'are spaces, 6 is a partition plate, 10 is a steam supply pipe, b is a pre-expanded thermoplastic resin particle, f ₁ , f _2, ... is there.

Claims (1)

(57) [Claims] 1. A space on the inner side of a side hole such as a quarry trace of Otani stone is partitioned by a partition plate having a filling port, and then the pre-expanded thermoplastic resin particles having an expansion ratio of 10 to 100 are squeezed from the filling port. After filling the space with air, the pre-expanded thermoplastic resin particles are foamed by heating with steam, and at the same time, the particles are fused together to form a foamed molded article. The space on the entrance side of the horizontal hole after the formation of the horizontal hole is partitioned by a partition plate having a filling port, and thereafter, the steps of filling the pre-expanded thermoplastic resin particles and forming the foam molded article by steam heating are repeated, and the horizontal hole is foam-formed. A method for embedding a side hole, characterized by embedding in the body.