JPH045324A - Widening civil engineering work method using foaming resin - Google Patents

Abstract

PURPOSE:To obtain a foaming unit, firmly connected to the ground, by implanting a stopper member for stopping the foaming unit about a half degree in the ground of a widening work site thereafter setting up a mold form coating this widening work site and inputting a predetermined amount of material beads into this mold form to heat and foam the material beads. CONSTITUTION:First a plurality of stopper members 10, having a suitable num ber of flanges 10a, are implanted about a half degree in a tilt wall surface 8 and a widening ground surface 9 and provided with a function for stopping a foaming unit. Then, jet pipes 2, hoses 3, steam storage tank 4, pressure regulat ing valve 5 and a pressure pump 6 or the like are provided by setting up a mold form 1 coating a widening work site. Next, material beads 11 are input, heated and foamed by jetting steam of about 100 deg.C from the jet pipe 3 for about 15min at a flow rate of about 0.4m<3> per minute. In this way, the foaming unit, which is compression-formed in a condition of holding the stopper member 10, can sufficiently function as the ground constitution of required strength.

Description

[Detailed description of the invention] [Industrial application field]

The present invention provides foaming properties that simplify the widening work by foaming foamable resin into the desired shape at the widening site to form a foam during civil engineering work such as widening sloped walls in golf course development sites and widening roads. Regarding widening civil engineering work using resin.

[Conventional technology]

Attempts have been made to take advantage of the lightweight nature of foamable resins to fill depressions or use them as part of artificial ground. For example, foamable resin is molded into foam blocks of a predetermined shape in a factory, the foam blocks are piled up on the original ground that is to be embanked, 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 a foundation by stacking foam blocks, misalignment is likely to occur between the foam blocks. Therefore,
Utility Model Application No. 63-81941, Utility Model Application No. 63-8194
In order to eliminate this misalignment, Patent Publications No. 2 and the like introduce 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. There is.

[Problem to be solved by the invention]

However, the method of transporting foam blocks that have been foamed in a factory to the site and stacking them into a predetermined shape requires time and effort to transport and handle. For example, a large block of about 2XIX 0.5 m is used as this type of block, but such a large block requires manpower to transport, although it is lightweight. Furthermore, the transportation is essentially like transporting air, which is wasteful. Moreover, as the blocks become larger, gaps are more likely to form between the original ground on which work such as embankment is to be performed and the blocks laid down, so it is necessary to form the original ground flat in advance. On the other hand, Japanese Patent Application Laid-Open No. 47-19 discloses that foamable resin is foamed on-site.
The method described in Japanese Patent No. 617 solves this problem. However, this publication does not specifically teach how to foam the foamable resin. By the way, if the resin is simply foamed, the surface of the foamed product often does not have the required contour due to non-uniform foaming or the like. In addition, when foaming occurs at the free interface,
The surface strength of the foam is insufficient, and dents are likely to occur when treading pressure is applied. In the case of widening civil engineering work, there is a risk that water may accumulate at the interface between the foam and the ground and the foam may be washed away by water pressure, or the foam may move due to vibrations in the ground.Therefore, the present invention The purpose is to form a foam with the required strength that is bonded to the ground at the widening site.

[Means to solve the problem] For this purpose, the present invention involves planting a foam locking member in the ground at the widening site, placing a required amount of foam resin raw material beads into a formwork set in the ground covering the widening site, and The method is characterized by supplying heated gas such as water vapor into the frame to heat and foam the raw material beads, and forming a compressed foam holding the locking member in the frame to widen the ground. [For production]

With such means, the foam holding the locking member is formed in a compressed state at the widening site within the formwork, so the foam has the required strength. Further, the foam is coupled to the ground by holding a locking member planted in the ground. The heated gas from the raw material beads is discharged out of the mold or recovered by appropriate means. Furthermore, it is preferable that the surface of the foam formed at the widening site be compacted using topsoil. Various foamable resins used in the present invention are commercially available, such as styrene resins, phenol resins, urea resins, and urethane resins. The foaming temperature of the foamable resin is determined appropriately depending on the type of resin, but is usually 70 to 2
A sufficient foaming reaction can proceed at about 00°C.

【Example】

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention applied to civil engineering work to widen a sloped wall in a golf course development site will be described in detail below with reference to the accompanying drawings. FIG. 1 shows the equipment used in this embodiment, which includes a formwork 11 that covers the ground widening site, an ejection pipe 2 that ejects water vapor as a heated gas into the formwork 1, and a hose that distributes the water vapor to each ejection pipe 2. 3. It is composed of a water vapor storage tank 4 to which a hose 3 is connected, a pressure pump 6 that communicates with the water vapor storage tank 4 via a pressure regulating valve 5, a boiler 7 that supplies water vapor to the pressure pump 6, and the like. First, a foam locking member 10 is planted on the ground at the widening site, that is, on the inclined wall surface 8 and the ground 9 where the width is to be widened. As this locking member 1O, an appropriate member such as a rod-shaped member having an appropriate number of flanges 10a is used, and this is implanted with half exposed. Next, formwork 1 is installed to cover the ground widening site. As shown in Fig. 2, this formwork 1 is shaped to cover the top, front, and left and right sides of the widening site.
The flange portion 1a is fixed to the inclined wall surface 8 and the ground 9 whose width is to be widened by appropriate means such as piling. Here, the above-mentioned formwork l has an opening/closing lid 1c having a large number of small holes 1b for releasing steam in the earthen wall, and has a structure in which the left and right side walls can be attached and detached by connecting bottles, etc., and the left and right side walls are provided with appropriate intervals. An appropriate number (four in this embodiment) of vibrator insertion holes 1d are provided. Then, four ejection vibrators 2 are installed between the left and right side walls of the formwork 1 through the vibrator insertion holes 1d of the installed formwork 1. This jetting vibrator 2 is provided with a large number of jetting holes 2a on its circumferential surface, each having a diameter smaller than that of the raw material beads 11 of foamable resin.
One end is closed to prevent water vapor from escaping. Then, each hose 3 is attached to the open end of each squirt vibrator 2.
Connect. Next, the opening/closing lid 1c is opened in the mold l, a required amount of raw material beads 11 are introduced, and the opening/closing lid 1c is closed and fixed to complete the preparation. After the above preparations are completed, the steam S generated by the boiler 7 is pressurized by the pressure pump 6, adjusted to a predetermined pressure by the pressure regulating valve 5, and stored in the storage tank 4. Then, the water vapor S in the storage tank 4 is ejected into the formwork 1 from the four ejection vibrators 2 via each hose 3. Here, the input amount of the raw material beads 11 was 90 kg, assuming that the internal volume of the widening site covered with the formwork 1 was 3 m3. Moreover, as the raw material beads 11, styrene resin beads with an average particle size of 0.9 mm were used. The foaming reaction of these resin beads changes as shown in Figure 3 in relation to temperature and time, and when foaming stops, the resin beads expand into a foam with an expansion ratio of about 30 to 45 times, and the density of the foam is about 0. .015 g/c
m3. The temperature of the water vapor S injected as a heated gas is 10
The temperature was 0°C, and this was ejected for 15 minutes at a flow rate of 0.4rr13 per minute. Under such conditions, the raw material beads 11 in the formwork l
was uniformly heated and foamed as the air in the mold l was pushed out through the upper small holes 1b and replaced with water vapor S. At this time, since the foaming volume is regulated by the formwork 1, the raw material beads 11 are subjected to a compressive load in the latter stage of foaming, and the highly dense compressed foam 12 is placed inside the formwork 1 without any gaps (formed). Figure 4 shows the foam 12 obtained by removing the formwork l;
Each locking member 10 is carried by and integrated with the foam 12 and connects the foam 12 to the sloped wall surface 8 and the widening ground surface 9. The formed foam 12 had a foaming ratio of about 35 times, a density of about 30 kg/m3, and a dense surface. Here, FIG. 5 is a graph showing the experimental results of determining the relationship between the density and compressive stress of foams formed under various conditions.
The compressive stress value was measured when a compressive strain of 4% was applied to a test piece measuring 50 mm by 50 mm. As is clear from FIG. 5, the strength of the foam increases as the density increases, and at a density of 30 kg/m3, a compressive strength of about 1.3 kg/cm2 is obtained. This compressive strength indicates that the ground has sufficient tread pressure strength, considering that the stress generated under the pavement surface under normal traffic loads is 0.5 kg/cm2 or less. It is. In addition, even if the foam density is 20 kg/m3, the foam density is 0.5 kg/m3.
Since compressive strength of cm2 or more can be obtained, when considering raw material consumption and weight reduction, it is recommended to lower the foaming density to the extent possible (
It is advantageous to do so. In addition, in the above embodiment, a relatively short line 1 along the inclined wall surface 8
However, in order to obtain a continuous long foam, a long formwork along the inclined wall surface 8 may be used. It may be formed in the direction. [Effects of the Invention] As explained above, according to the present invention, the foam holding the locking member is formed in a compressed state at the widening site in the formwork, so the foam develops the necessary strength to withstand treading pressure. It functions well as a ground construction material. Furthermore, since the foam is connected to the ground by holding the locking member planted in the ground, it will not be washed away by water pressure or moved by vibration.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of an embodiment of the present invention, and is a side view showing the widening site in cross section along with the equipment configuration. FIG. 2 is a perspective view of the formwork portion in one embodiment. A graph showing the foaming reaction of the styrene resin beads used in the example as a function of temperature and time. Figure 4 is a cross-sectional view of a foam formed according to an example. Figure 5 is the density and compression of the foam. It is a graph showing the relationship with stress. 1... Formwork, 1a... Flange portion, 1b... Small hole, 1c... Opening/closing lid, 1d... Vibrator insertion hole, 2... Ejection pipe, 2a... Ejection hole, 3...Hose, 4...Steam storage tank, 5...Pressure adjustment valve, 6...Pressure pump, 7
...boiler, 8...slanted wall surface, 9...
Ground to be widened, 10...Locking member, 10a...Brim, 1...Raw material beads,

Claims (1)

[Claims] A foam locking member is planted in the ground at the widening site, and the required amount of foam resin raw material beads is poured into a formwork set in the ground covering the widening site, and heated gas such as steam is poured into the formwork. A widening civil engineering method using foamable resin, which is characterized by supplying raw material beads to heat and foam them, forming a compressed foam body holding a locking member in a formwork, and widening the ground.