JPH01219201A - Foaming resin block for foundation of construction and manufacture thereof - Google Patents

Abstract

PURPOSE:To make it possible to show a drainage function in a laminated state and to drain the rain and the like into the foundation on the underside or the outside of the side by forming an appropriate number of perforated holes lengthwise and/or crosswise on foaming blocks of synthetic resin. CONSTITUTION:A number of perforated holes 2 are formed lengthwise or crosswise on foaming resin blocks 1. In case of constructing a laminated structure 10, foaming blocks are so piled up in the vertical direction that the perforated holes 2 of the foaming resin blocks 1 fit with each other. According to the constitution, in the execution at a watery site, the buoyance of resin blocks 1 can be reduced to facilitate the construction of a piling up of foaming blocks and the execution of laying them underground.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a foamed resin block for civil engineering foundations and a method for manufacturing the block.

(Prior art) In recent years, as an ultra-light embankment construction method especially for soft ground, a styrofoam embankment is constructed by stacking rectangular blocks of expanded polystyrene (EPS) one after another on soft ground, etc.
So-called styrofoam (styrofoam) on which paved roads, etc. are built
EPS) civil engineering method has been developed and is already being implemented on a trial basis or in actual road construction in European countries such as Norway and Sweden.

This Styrofoam civil engineering method reduces embankment settlement by approximately 1/2 compared to embankments made of earth and sand, because the Styrofoam is less than 17,100 yen lighter than earth and sand.
100%, and since the stacked foamed resin blocks are mutually self-supporting and the blocks themselves have non-pressure properties, it is possible to form upright walls, and therefore embankments on soft ground, Backfill material for abutments and retaining walls, sloping natural #! This is a useful construction method for constructing embankments using planks.

Recently, the foamed polystyrene civil engineering method has been introduced into Japan, and various tests are being conducted to put it into practical use.

(Problem to be Solved by the Invention) In the above-mentioned civil engineering method, it is necessary to provide a laminated structure of polystyrene foam blocks with drainage holes or drainage ditches for draining rainwater from the surface paved road to the ground below. Needed.

However, the conventional method of constructing drainage holes (grooves) is to separately form drainage holes by cutting and drilling after laminating foamed resin blocks, which is a very laborious process. Moreover, the appearance after completion was not at all good. Furthermore, it was very troublesome to clean up the foamed resin waste after processing.

In addition, in the EPS civil engineering method, the specific gravity of the Styrofoam blocks is extremely smaller than that of water, so the buoyancy of the Styrofoam blocks acts strongly, especially when construction is carried out in areas with a lot of water or during rain, and the laminated foam resin blocks are used as paving road material. The problem was that it was difficult to bury it, and drainage work required a lot of effort and time.

Furthermore, the above construction method has the problem that there is a risk that the laminate of Styrofoam blocks may collapse due to strong impact or vibration.

These points have traditionally been considered problems in practical tests aimed at establishing the technical establishment of Styrofoam civil engineering methods.

The present invention was made in consideration of the above-mentioned circumstances, and its purpose is to exert a drainage function in a layered state such as an embankment (also during layering work), and to drain rainwater etc. from the ground below. Foamed resin blocks for civil engineering foundations can also be flushed out to the side, and also allow for easy burying of the foamed resin blocks with road materials during construction, alignment of the blocks, and fixing work. Our goal is to provide the following.

Another object of the present invention is to form a foamed resin block for civil engineering foundations that can be used to form drainage holes in advance of civil engineering construction and to produce the foamed resin block of the present invention, which has excellent drainage properties and workability, by a simple method. An object of the present invention is to provide a method for manufacturing a resin block.

(Means for Solving the Problems) Therefore, the present invention is made of foamed synthetic resin,
The present invention relates to a foamed resin block for civil engineering foundations characterized by having an appropriate number of through holes formed in the vertical and/or horizontal directions.

The present invention also relates to a foamed resin block for civil engineering foundations, characterized in that, in the foamed resin block described above, the central portion of the through hole has a small diameter.

In the present invention, "forming a through hole in the vertical direction" means
A through hole is formed in the vertical direction so as to connect the upper and lower surfaces of the foamed resin block, and "through holes are formed in the horizontal direction" means that the through hole is formed in the opposite end of the foamed resin block. It is said to be formed in the horizontal direction so as to connect the side surface and the side surface on the other end side.

In the foamed resin block of the present invention, the through holes function as drainage passages (rainwater distribution passages), as water suction passages in the installation ground, and as insertion passages for fixing members such as pipes, as described below. It is. The size, number, cross-sectional shape, etc. of the through holes are arbitrary, but
It is preferable to make the through-holes have different diameters, with the central part of the through-hole having a small diameter and the opposite ends thereof having a large diameter, since the fixing member can be shortened and the mutual alignment of the blocks is extremely easy. Further, in order to fix the blocks to each other, it is preferable that the through-holes of the resin block and the through-hole of the adjacent resin block be provided at the same position so as to coincide with each other when stacked or placed side by side.

The foamed resin block in the present invention is made of bead fusion molded expanded polystyrene foam, crosslinked polyethylene foam,
Preferred is a closed-cell synthetic resin foam having a specific gravity of 18 to SOg/l, such as polypropylene foam.

The foamed resin block of the present invention is usually a rectangular parallelepiped, and the above-mentioned EP
According to the S civil engineering method, a laminated structure can be created by arranging materials vertically and horizontally to form a horizontal plane and stacking them one above the other to form a three-dimensional structure.

In this case, it is preferable for the through holes to be continuous vertically or horizontally across a plurality of resin blocks for purposes such as drainage equipment, and foamed resin blocks with through holes provided at the same position are preferably used. It is better.

The foamed resin blocks for civil engineering foundations can be stacked either by aligning the ends of the blocks or stacking the blocks in a so-called houndstooth pattern with the ends offset from each other. If desired, apply adhesive to the protrusions and depressions. The bonding between the foamed resin blocks may be strengthened by interposing them between the foamed resin blocks.

As the adhesive, synthetic rubber, synthetic resin latex, emulsion adhesive, etc. are used.

The present invention also provides a method for manufacturing the above-mentioned foamed resin block, using a foaming mold in which an appropriate number of rods are provided on the inside of the concave mold or on the back surface of the flat mold with a length approximately equal to the depth of the concave mold in the mold opening/closing direction. The present invention also relates to a method for manufacturing a foamed resin block for civil engineering foundations, which comprises filling a synthetic resin foamed block material into the mold, subjecting it to heating and foaming, and then removing the mold.

The rod is a member corresponding to the through hole, and is provided in the mold opening/closing direction of the foam molding mold, that is, in the vertical or horizontal direction of the foamed resin block to be molded, and its length is set so that it forms a through hole. The length is set to be approximately equal to the depth of the concave mold, that is, the length is approximately equal to the height, width, and length of the foamed resin block to be molded.

The cross-sectional shape of the rod may be either round or polygonal, and is appropriately selected. Although the thickness of the rod is arbitrary, it is preferable that the rod be of such a thickness that it will form a through hole large enough to insert the block fixing pipe. Also, rods tapered at an angle of 1" to about 10" are particularly preferred as they make demolding of the foamed resin block easier.

The rods can be attached by fixing them to the inside bottom of the concave mold in the mold opening/closing direction (Figure 8), fixing the rod to the back of the flat mold in the mold opening/closing direction (Figure 9), There is a method of connecting the rod integrally with the recessed ejector in the direction of its movement (Fig. 1O), but it is fixed to the inside bottom of the recess and the back of the flat mold so that their tip surfaces touch each other when the mold is closed. There is no way.

In order to manufacture a foamed resin block in which through-holes with different diameters are formed with a narrow center part, two rods are provided facing each of the concave bottom surface and the flat back surface and in contact with each other when the mold is closed. Both tips of the rod may be made small in diameter (FIG. 11), or only the tip of at least one of them may be made small in diameter.

Also, in order to make demolding of the foam-molded block easier, it is preferable that the rod is movable in the direction of opening and closing the mold.
A drive device for this purpose may be coupled to the rod. Furthermore, it is most preferable to use a hollow rod so that the heating for foam molding can be supplied from the inside of the rod to the inside of the mold.

For other configurations of the foam mold, conventionally known configurations can be used as appropriate.

Accordingly, the manufacturing method of the present invention involves filling the above-mentioned foam mold with pre-expanded polystyrene particles, and closing the foam mold so that the rod is located in the cavity consisting of a concave mold and a flat mold. Then, a rectangular parallelepiped-shaped foamed resin block is formed through a molding process such as steam heating, and after the mold is opened, the foamed resin block of the present invention is taken out from the mold using an ejector. Regarding the temperature, pressure, etc. for foam molding, the conditions used in conventional conventional manufacturing methods can be applied.

(Function) In the foamed resin block of the present invention, the vertical/horizontal through holes can be used as vertical or horizontal drainage passages. Therefore, when the through holes are provided continuously, the state of the laminated structure is Rainwater, groundwater, etc. can be drained downward or to the sides. Vertical through holes are usually more advantageous as drainage holes, but when building a stack of resin blocks on a mountain slope or the like, drainage through horizontal through holes becomes important.

Furthermore, when the resin block of the present invention having vertical through-holes is installed on a place with a lot of water or on ground that is muddy due to rain, as shown in FIG. 12, 11! !
The water 17 in the board I enters into the through hole 2, thereby reducing the buoyancy of the resin block I itself and increasing the stability of the block. Therefore, stacking and burying the foamed resin blocks becomes much easier. .

Furthermore, in the foamed resin blocks of the present invention, when stacking or placing them side by side, it is possible to align them by looking through the through holes, and by inserting pipes, shafts, etc. into the continuous through holes, the foamed resin blocks can be aligned. combine,
Misalignment can be prevented.

(Examples) Hereinafter, the present invention will be explained in more detail by showing examples, but the following examples are not intended to limit the present invention.

Example 1 As shown in FIG. 1, the foamed resin block l of this example
is 1820mm long, 920m5 wide, 420mm thick
A rectangular polystyrene foam block with a diameter of 50 mm.
Three through-holes 2 with m■φ in the vertical direction (so that the block top surface 3 and block bottom surface 4 communicate) 15
They are provided at equal intervals of 0 mm.

This block l has a length of 410 m as shown in Figure 8.
Rods 13 with a bottom diameter of 50 mm and a Taber angle of 2'' are installed on the inner bottom surface of the concave mold 8 at equal intervals of 150 mm, and are movable in the mold opening/closing direction (±X direction in the figure) by a drive cylinder 14. Using a mold, the ratio g11 is placed in the mold.
While filling 0 kg/am' of polystyrene pre-expanded particles, the rod 13... is set so as to protrude into the inside of the concave mold 8, and then the mold is closed with the flat mold 9, followed by steam heating, and after foaming is completed. This is obtained by retracting the contact 13 from the inside of the concave mold 8, and then ejecting the finished foamed resin block from the mold using an ejector 15.

Examples of the foaming mold include a mold in which a rod 13 having the same shape as the one described above is attached to the back surface of a flat mold 9 so as to be movable in the mold opening/closing direction by a drive cylinder 14, as shown in FIG.
A similar foamed resin block l can also be produced by using a mold in which a rod 13 of the same shape as above is integrally connected to the ejector 16 of the concave mold 8 in its moving direction, as shown in the figure. Ta.

When making a laminated structure 10 of resin blocks, the foamed resin blocks are stacked one on top of the other as shown in FIG. Vibrator 18 or continuous through hole 2
and the blocks are fixed together.

As shown in Figure 7, this structure is a place where about 30cm of rainwater has accumulated! It was constructed on top of 111 and a concrete ground 12 was placed on top of it to form a simple civil engineering foundation. Since the buoyancy of the foamed resin blocks was significantly reduced compared to the conventional one, stacking and burying them became very easy, and the through-holes 2 made it possible to drain water smoothly. Furthermore, since post-processing of the drainage hole is no longer necessary, the construction time is shortened to 273 mm or less compared to the conventional case, and construction efficiency is significantly improved.

Example 2 As shown in FIG. 2, the foamed resin block 1 of this example
is the same size as the block of Example 1, and has a diameter of 5
Three through-holes 5 having a diameter of 0 mm are provided at equal intervals of 150 mm in the lateral direction (so that the side surface 6 on one end of the block and the side surface 7 on the other end of the block are connected).

The materials, manufacturing method, and other matters are the same as in Example 1.

The block l of this example also has the through hole 2 as a drainage hole,
It could also be used as an insertion hole for a fixing pipe.

Example 3 As shown in FIG. 3, the foamed resin block l of this example
The block has the same size as the block of Example 1, and has three through holes 2' with different diameters, each having a diameter of 3 hmφ at the center and a diameter of 50 mm at the upper and lower ends, at equal intervals of 150 mm in the vertical direction. .

The through holes 2' are each 150 m from the upper and lower surfaces of the block.
The inner part has a smaller diameter of 30 mmφ than the depth of m.

When making a construction lO with this foamed resin block l,
As shown in FIG. 6, the fixing member 18'' can be short, and the mutual positioning of the resin blocks l is extremely easy.It goes without saying that the through hole 2' can be used as a drainage hole.

This foamed resin block l consists of two rods 13 with different diameters, the base end having a large diameter and the distal end having a small diameter, as shown in FIG.
A foaming mold was used in which the sets of ' and 13' were arranged so as to face the inner bottom surface of the concave mold 8 and the back surface of the flat mold 9, and to come into contact with each other when the mold was closed, and the materials and other conditions were as in Example 1. It can be made in the same manner as in Example 1.

(Effects of the Invention) As explained above, the foamed resin block for civil engineering foundations of the present invention has a drainage function due to the formation of through holes, allowing rainwater etc. to pass through the inside of the block and flow out to the outside. Furthermore, when vertical through-holes are formed, the buoyancy of the resin blocks can be reduced during construction in locations with a lot of water, making stacking and burying construction much easier. Furthermore, it is possible to align the resin blocks using the through holes as a reference, and by inserting other shaft-like members, the foamed resin blocks can be stably and easily fixed to each other, especially with through holes of different diameters as mentioned above. If so, the resin block can be fixed even more easily using a short shaft-like member, and unlike conventional fixing processes, the resin block does not deform.

In addition, the method for manufacturing the foamed resin block for civil engineering foundations of the present invention allows the foamed resin block of the present invention to be manufactured at the same time as foam molding, that is, through pre-processing, and is extremely simple, and post-processing at the construction site is not required. Therefore, the workability of construction is greatly improved, the construction period is shortened, and there is no processing waste, which is economically advantageous.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing a foamed resin block for civil engineering foundations according to Example 1 of the present invention, FIG. 2 is a perspective view showing a foamed resin block according to Example 2, and FIG. 3 is a perspective view showing a foamed resin block according to Example 3. FIG. 4 is a sectional view showing a laminate of foamed resin blocks of Example 1, FIG. 5 is a sectional view of a modified example of a laminate of foamed resin blocks, and FIG. 6 is a sectional view of a laminate of foamed resin blocks of Example 3. 7 is a cross-sectional view showing a laminate of resin blocks, FIG. 7 is a diagram showing a civil engineering structure made using the foamed resin blocks of the example, and FIGS. 8 to 11 are foam molds for manufacturing the foamed resin blocks. FIG. 12 is a cross-sectional view showing the buoyancy reducing effect of the foamed resin block of Example 1. In the figure, l...Foamed resin block 2.2', 5...Through hole 3...Top surface 4...Bottom surface 6...One end side surface 7...Other end side surface 8... Concave
9...Flat type 10...Construction 13.13"
...Bar 18 battle...Pipe Fig. 1 Fig. 2 Fig. 3 Fig. 5 Fig. 6]] Fig. 8 Fig. 9 @ Fig. 10

Claims (3)

[Claims] (1) A foamed resin block for civil engineering foundations, which is made of a synthetic resin foamed block and has an appropriate number of through holes formed in the vertical and/or horizontal directions. (2) The foamed resin block for civil engineering foundations according to claim 1, characterized in that the central portion of the through hole has a small diameter. (3) Using a foam mold with an appropriate number of rods installed on the inside of the concave mold or on the back of the flat mold with a length approximately equal to the depth of the concave mold in the mold opening/closing direction, the synthetic resin foam block material is placed inside the mold. A method for producing a foamed resin block for civil engineering foundations, which comprises filling, heating and foaming, and then demolding.