JPH0480422A - Civil engineering method using foamable resin - Google Patents

Abstract

PURPOSE:To form lightweight concrete having a shape necessary for the field ground by spouting foamed particles of foamable resin, which is foamed preliminarily and aged, together with mortar or aerated mortar, and filling the field ground therewith to solidify. CONSTITUTION:Foaming particles 4 of foamable resin preliminarily foamed and aged are spouted together with mortar or aerated mortar to fill the field ground such as a hollow 9, etc. therewith. By solidifying it, lightweight concrete 10 having strength necessary for a shape of the field ground is formed. According to the constitution, field work for preliminary foaming and aging, etc. can be obviated.

Description

[Detailed Description of the Invention] [Industrial Application Field 1] The present invention is applicable to civil engineering works such as filling potholes, creating mounds, and widening roads by forming lightweight concrete in a desired shape on the ground at the site. Concerning a civil engineering method using foamable resin to simplify the process.

[Prior Art 1] Attempts have been made to take advantage of the lightweight nature of foamable resin and use it as a filling material for depressions or as part of artificial ground.

For example, foamed resin is molded into foam blocks of a predetermined shape in a factory, and the foam blocks are piled up on the ground at the site where the embankment is to be made, and the surface layer is finished with concrete floor plates, wall protection materials, etc.

Additionally, reinforcing materials such as reinforcing bars are placed inside to improve structural strength.

When forming the ground by stacking foam blocks, misalignment is likely to occur between the foam blocks. Therefore, Utility Model Application No. 63-81941, Utility Model Application No. 63-819
In order to eliminate this misalignment, Japanese Patent Publication No. 42 and the like introduces the method of forming irregularities on the surface of the foam block and interlocking the irregularities.

Furthermore, Japanese Patent Application Laid-Open No. 47-19617 discloses that after spraying an unfoamed resin such as urethane, vinyl chloride, or styrene onto a depression or roadbed, a foaming reaction is caused to fill the depression. [Problem to be Solved by the Invention 1] By the way, when using foam blocks that are pre-produced in a factory as described above, it is necessary to prepare the ground in advance so that the foam blocks can be laid without gaps and stacked. It needs to be created flat.

Also, if the foam block used is large (2XIX
(about 0.5 m) requires manpower to transport and stack on-site, making on-site work more troublesome than expected.

On the other hand, as described in Japanese Patent Application Laid-Open No. 47-19617,
Although this problem does not arise in the method of foaming the foamable resin on-site, the publication does not specifically teach how to foam the foamable resin.

Here, in order to form a foam of a desired shape using a foamable resin, steps such as pre-foaming, aging, and pressure molding are generally required. However, in order to form a large foam suitable for the soil at the site of civil engineering work, uniform pre-foaming and aging must be performed, and it is expected that it will be difficult to perform site work reliably and easily.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to enable civil engineering work that fully utilizes the lightness of foamable resin while ensuring reliable and simple on-site work.

[Means for Solving the Problems] For this purpose, the present invention provides foamed particles of foamable resin that have been pre-foamed and matured together with mortar or foam mortar to fill the ground at the site, and solidify the mortar to form the site. It is characterized by forming lightweight concrete in the required shape on the ground.

[Function 1] With such means, the foamed particles of the foamable resin filled in the ground at the site are bonded to each other as the mortar or cellular mortar solidifies, and the ground at the site is filled with a lightweight material with the required strength according to its shape. Concrete is formed.

[Embodiment] Hereinafter, an embodiment of the present invention applied to the filling work of a depression will be specifically described with reference to the attached drawings.

First, the schematic configuration of one embodiment will be explained with reference to FIG.
As the material for filling the depression, foamed resin is pre-foamed with water vapor, and then foamed granules aged by air drying are used, and mortar (foamed mortar may be used) is used as the binding material.

Then, these foamed particles are placed on a blower air stream and are forcedly conveyed, and
By force-feeding the mortar with a force-feeding machine, both are mixed and ejected to fill the hollow. Thereafter, after waiting for the mortar to harden, lightweight concrete of the desired shape is formed in the depression.

Various types of foamable resins are commercially available, such as styrene resins, phenol resins, urea resins, and urethane resins. Therefore, a styrene resin raw material with a particle size of 0.7 to 0.9 mm mixed with a blowing agent such as butane or pentane is used. Then, water vapor at around 100° C. is supplied to this styrene resin raw material to pre-foam it. Approximately 12 hours after that,
It is matured by blow drying to obtain foamed grains. The expanded beads of the expandable resin thus obtained have an expansion ratio of about 30 to 50 times.

FIG. 2 shows the configuration of the device used in this example.
A hose 3 is installed at the outlet of the blower 2 that sucks air through the
is connected to the hose 3, and a hopper 5 into which the foamed beads 4 are introduced is connected in the middle of the hose 3. This hopper 5 includes a screw auger 5 which is rotationally driven by a motor 5a.
b allows the inserted foam particles 4 to be fed into the hose 3. In addition, near the discharge port of the hose 3,
A pressure feed t1117 for force-feeding the mortar 6 is connected via a hose 8. And with the operation of blower 2,
The foamed grains 4 supplied from the hopper 5 into the hose 3 are fed under pressure by the blower airflow, and the mortar 6 in the pressure sending machine 7 is
is mixed into the foamed beads 4 via a hose 8.

Therefore, the blower 2 and the pressure feeder 7 are operated, and the foamed particles 4 are mixed with the mortar 6 and ejected into the depression 9 where the hole is to be filled. In this case, in order to fully utilize the lightness of the foamable resin, in this example, the foamed particles 4 and the mortar 6 are
The standard mixing ratio was 1=2.

After filling the depression 9, the individual foam particles 4 are bonded to each other by solidification of the mortar 6, and as shown in FIG. 3, a lightweight concrete 10 corresponding to the shape of the depression 9 is formed within the depression 9.

The compressive strength of the lightweight concrete 10 thus obtained is 1
．． Considering that the stress generated under the paved road surface under normal traffic loads is 0.5 kg/cm2 or less, it can be seen that it has sufficient tread pressure strength.

In addition, although the above-mentioned embodiment explained the work of filling in a depression, the present invention is also applicable to work of filling in a continuous long trench,
It can also be applied to the creation of rockeries and road widening work using formwork.

(Effect of the invention 1 As explained above, according to the present invention, the foamed particles of the foamable resin filled in the ground at the site are bonded to each other as the mortar solidifies, and the ground at the site has the required strength according to its shape. of lightweight concrete is formed.

Therefore, it becomes possible to carry out civil engineering work that takes full advantage of the lightweight nature of the foamable resin.

In addition, since the foamable resin handled at the site is pre-foamed and matured encapsulated granules, the site work of pre-foaming and ripening is not required, making the site work reliable and simple.

[Brief explanation of drawings]

FIG. 1 is a block diagram showing a schematic configuration of an embodiment of the present invention, FIG. 2 is a side view showing the configuration of a device used in the embodiment, and FIG. 3 is a block diagram of a lightweight concrete formed according to the embodiment. FIG. 1... Heater, 2... Pro Otsu 3... Hose, 4... Foaming pellets, 5... Hopper, 5a... Motor, 5b... Screw auger, 6...
... Mortar, 7... Pressure feeder, 8... Hose, 9... Depression, 10... Lightweight concrete.

Claims (1)

[Claims] Fill the ground at the site by ejecting foamed resin particles that have been pre-foamed and matured together with mortar or foam mortar.
A civil engineering method using foamable resin that is characterized by forming lightweight concrete in the desired shape on site by solidifying mortar.