JP2008019617A - Filling construction method of horizontal hole grave cavity part - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a filling construction method capable of closely filling a filler in a horizontal hole grave cavity part. <P>SOLUTION: This filling construction method of the horizontal hole grave cavity part injects, foams and fills field foaming hard polyurethane foam up to the height of a foaming styrene block of a first layer into a clearance formed of a wall surface of the horizontal hole grave cavity part and the foaming styrene block of an end part, by laying the foaming styrene block of the first layer all over, after sticking Japanese paper to a surface of the horizontal hole grave cavity part, and then, injects, foams and fills the field foaming hard polyurethane foam up to the height of a ceiling surface into a clearance formed of the ceiling surface of the horizontal hole grave cavity part and the foaming styrene block in a certain n-th stage being the uppermost stage, by repeating similar work up to the n-th stage. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a filling method for a side hole tomb cavity.

  A horizontal tomb is a tomb made in the latter half of the Kofun period. Specifically, it is a tomb dug in a horizontal hole on a steep slope, measuring 3m in height, 3m in width, and 5m in depth. There are many side-hole tombs consisting of hollow parts.

  Recently, in order to suppress the weathering of the side hole tomb cavity and prevent disasters caused by collapse, the side hole tomb cavity has been refilled. As a backfilling method, first, a foamed styrene block is laid in the side hole tomb cavity, and then foamed mortar is injected into the gap formed between the foamed styrene block and the wall surface or ceiling surface of the side hole tomb cavity. After that, the same work was repeated and the method of filling the side hole tomb cavity was adopted.

On the other hand, as a lightweight embankment method, after forming a waterproof primer having affinity with polyurethane on the ground surface as described in Patent Document 1, a hard synthetic resin foam block of the first layer is spread, and the ground and the block Light weight characterized by injecting a predetermined amount of hard foamed polyurethane forming composition into the gap with the layer, filling the foam up to the height of the first layer, and then repeating the same work for the second and subsequent layers The embankment method is described.
Japanese Patent No. 2775693

  However, the former has the following problems. Some of the side hole grave cavities are higher in the back than the entrance height, and when foamed mortar is injected at such a high place, the foamed mortar has high fluidity. The foamed mortar flowed into a low place, and it was difficult to foam and fill at a predetermined position. As a result, a gap was generated in the side hole tomb cavity, and the earth and sand of the ceiling and wall surface of the side hole tomb cavity collapsed, and there was a possibility that weathering of the side hole tomb was suppressed and collapse could not be prevented.

  Therefore, when filling a place that is higher than the entrance of the side hole tomb cavity, form a mold so that the foam mortar fills in place, and the foam mortar flows from the high place to the low place. Although the means to prevent it was considered, since the side hole grave cavity is a narrow space, it takes time and labor to assemble such a formwork, and there was a problem in workability.

  Moreover, when the latter method was diverted to the filling method for the side hole grave cavity, there were the following problems. The surface of the cave tomb was made of earth, sand, stone, etc., and was uneven. Therefore, with the latter primer having waterproofness, specifically, a primer made of synthetic resin, although waterproofness is surely obtained, the surface of the side hole tomb cavity, that is, the floor surface, wall surface, There was a problem that the followability with the ceiling surface was poor and the adhesion was not good. As a result, there are gaps between the primer and the floor surface, wall surface, and ceiling surface of the cavity, and there is a possibility that weathering cannot be suppressed and collapse cannot be prevented.

  This invention is made | formed in view of the subject of this prior art, and it aims at providing the filling construction method which can be filled with a filler without a clearance gap in a horizontal hole grave cavity part.

  According to claim 1 of the present invention, the filling method for the side hole tomb cavity part is a method of pasting Japanese paper on the surface of the side hole tomb cavity part, then laying a first layer of foamed styrene block, In-situ foamed rigid polyurethane foam is injected into the gap formed with the foamed styrene flock at the end and foamed and filled to the height of the foamed styrene block of the first layer. In the n-th stage, which is the uppermost stage, in-situ foamed rigid polyurethane foam is injected into the gap formed by the ceiling surface of the hollow grave cavity and the foamed styrene block, and the foam is filled to the height of the ceiling surface. It is characterized by that.

  Moreover, the filling method of the side hole grave cavity part of Claim 2 of this invention is characterized by the said clearance gap being 15 cm or less at the maximum width in a horizontal direction.

  According to the cavity filling method of the side hole tomb of the present invention, the filling material can be filled into the side hole tomb cavity without gaps, so that weathering of the side hole tomb cavity can be suppressed and disasters caused by collapse etc. can be prevented. I can do it. Furthermore, it is possible to return to the state before filling after filling.

  Below, one Embodiment of the filling method of the side hole grave cavity part of this invention is described, referring drawings.

  The filling method of the horizontal hole grave cavity of the present invention is the method of filling Japanese paper on the surface of the horizontal hole grave cavity, then laying the first layer of foamed styrene block, and the expanded styrene flock on the wall and end of the horizontal hole grave cavity In-situ foamed rigid polyurethane foam is injected into the gap formed by filling the foamed foam to the height of the first layer of foamed styrene block, then the same operation as above is repeated until the nth stage, the top stage In the n-th stage, in-situ foamed rigid polyurethane foam is injected into the gap formed by the ceiling surface of the hollow grave cavity and the foamed styrene block, and the foam is filled to the height of the ceiling surface. FIG. 2 is a view completed by this filling method, and FIG. 3 is a sectional view thereof. As another embodiment, there is a side hole tomb cavity as shown in the sectional view of FIG.

  Further, as shown in FIGS. 3 and 4, after filling the side hole tomb cavity 1 as described above, the entire entrance 8 of the side hole tomb cavity is covered with the in-situ foamed rigid polyurethane foam 7, and the in-situ foamed rigid polyurethane is covered. The top surface of the foam 7 may be completed by applying a resin mortar.

  In the present invention, first, as shown in FIG. 1 (a), the Japanese paper 2 is pasted by applying a cover to the entire surface of the side hole tomb cavity 1. The Japanese paper 2 can follow the surface of the side hole grave cavity 1 even if the surface thereof is uneven, that is, has good adhesion. As a result, the Japanese paper 2 can be affixed to the surface without a gap, and the Japanese paper 2 is difficult to peel off from the surface over time. In addition, Japanese paper 2 has excellent flexibility so that its surface is not damaged, and when it is filled with a filler other than Japanese paper (laying sand, foamed styrene block, in-situ foamed rigid polyurethane foam), the surface is scratched. This prevents the film from sticking, that is, plays a role as a protective layer.

In addition, as long as the Japanese paper 2 can be pasted on the entire surface of the side hole tomb cavity 1, an adhesive other than furan may be used. Can be pasted and easily peeled off. As a result, when it is necessary to return to the state before filling after filling the above-mentioned filling material into the side hole grave cavity portion 1, it can be easily returned.
Next, as shown in FIG. 1B, the spread sand 4 is laid so that the floor surface 3a is flat. The spread sand 4 can flatten the floor surface 3a, and can easily install a foam styrene block to be spread next, and when a plurality of foam styrene blocks are spread, in the joint portion between the horizontal blocks, A gap can be prevented from being generated.

  Further, as long as the floor surface 3a can be flattened, for example, soil or stone, synthetic resin foam, those obtained by pulverizing them, or a combination of a plurality of them may be laid.

  Next, as shown in FIG. 1 (c), a first layer of expanded styrene block 5 a is spread on the spread sand 4. At this time, when a plurality of foamed styrene blocks are spread, the gaps are spread so as not to form gaps in the joint portions between the horizontal blocks.

  Further, as shown in FIG. 1 (c), the foamed styrene block 5a is spread so that the gap 6a formed by the foamed styrene block 5a at the end and the wall surface 3b has a maximum width of 15 cm or less in the horizontal direction. Is preferred. When this gap 6a exceeds 15 cm, when the in-situ foamed rigid polyurethane foam 7a is injected into the gap 6a and filled with foam, the reaction heat at the time of foaming of the in-situ foamed rigid polyurethane foam 7a is increased. There is a possibility that the foamed styrene block 5a is melted and its shape is deformed. As shown below, the gaps 6a to 6n formed by the foamed styrene blocks 5a to 5n and the wall surface 3b and the gap 6 formed by the foamed styrene block 5n and the ceiling surface 3c are also 15 cm or less at maximum. It is preferable to spread the foamed styrene blocks 5a to 5n so as to form a gap. In addition, you may use a metal fitting as a means to fix foaming styrene blocks.

  The foamed styrene blocks 5a to 5n of the present invention may be in the form of a block made of a rectangular parallelepiped or a cube, and the size is not particularly limited, but the basic dimension is 2000 (length) x 1000 ( It is a rectangular parallelepiped of (width) × 500 (height) mm square.

  Further, the gaps 6a to 6n formed by the foamed styrene blocks 5a to 5n and the wall surface 3b at the end are preferably 15 cm or less at the maximum width in the horizontal direction. Can be used to cut the foamed styrene block at the end and change the dimensions before spreading.

  Next, as shown in FIG. 1 (d), in-situ foamed rigid polyurethane foam 7a is injected into the gap 6a formed by the wall surface 3b and the foamed styrene flock 5a at the end, and the first layer of foamed styrene block is injected. Foam filled to a height of 5a. This in-situ foamed rigid polyurethane foam has good adhesion to the Japanese paper and the foamed styrene block, and when foaming the hard polyurethane foam, there is no risk of passing through the Japanese paper and sticking to the surface of the side hole tomb cavity 1, but temporarily sticking Even if this is the case, the surface can be easily removed without damaging the surface.

This in-situ foamed rigid polyurethane foam contains, for example, a polyol component, a polyol, a catalyst, a viscosity reducing agent, a flame retardant, a foaming agent, etc., and this is mixed with a polyisocyanate component and foamed and cured, in accordance with JIS-A9526. It is preferable that the density is 30 to 50 kg / m ³ and the compressive strength at 1% strain based on JIS-K7220 is about 5 N / cm ² or more.

  Moreover, although there exist ester type and ether type | mold, a polyol is used suitably from the point of durability, especially hydrolysis resistance. Although it does not restrict | limit especially as a polyisocyanate component, Generally organic diisocyanate, such as crude MDI, is used. Although it does not restrict | limit especially as a foaming agent, It is preferable on an environmental measure to use 100% of water and not using CFCs together.

  Next, as shown in FIG. 1 (e), a second layer of foamed styrene block 5b is spread, and then, as shown in FIG. 1 (f), a wall surface 3b and an end of foamed styrene block 5b are formed. The in-situ foamed rigid polyurethane foam 7b is injected into the gap 7b and foamed and filled up to the height of the foamed styrene block 5b of the second layer, and then the third stage, the fourth stage, and so on up to the nth stage. In the n-th stage, which is the uppermost stage, in-situ foamed rigid polyurethane foam is injected into the gap between the ceiling surface 3c and the foamed styrene block 5n and foam-filled. As shown in FIG. The tomb cavity 1 was filled without any gaps.

  First, as shown in FIG. 1 (a), Japanese paper 2 was pasted by applying a cover to the entire surface of the side hole tomb cavity 1.

  Next, as shown in FIG.1 (b), the covering sand 4 was spread | laid so that the floor surface 4a might become flat.

  Next, as shown in FIG. 1 (c), the first layer of expanded styrene block 5a (2000 (length) × 1000 (width) × 500 (height) mm square) on the floor sand 4 Laid down. In addition, in the foamed styrene block at the end, the block was cut and spread on the site using a simple nichrome hot wire cutter or the like so that the maximum width of the gap 6a in the horizontal direction was 15 cm.

Next, as shown in FIG. 1 (d), in-situ foamed rigid polyurethane foam 7a is injected into the gap 6a formed by the wall surface 3b and the foamed styrene flock 5a, and the height of the first layer of foamed styrene block 5a is increased. Foam filled until The in-situ foamed rigid polyurethane foam used had a density of 34 ± 2 kg / m ³ according to JIS A9526 and a compressive stress of 17 kN / m ² according to JIS K7220.

  Next, as shown in FIG. 1E, the second layer of expanded styrene block 5b was spread. In addition, in the foamed styrene block at the end, a simple nichrome heat ray cutter or the like is used on site so that the maximum width of the gap 6b in the horizontal direction is 15 cm or less, like the foamed styrene block at the end of the first layer. The blocks were cut and spread.

  Next, as shown in FIG. 1 (f), in-situ foamed rigid polyurethane foam 7b is injected into the gap 7b formed by the wall surface 3b and the foamed styrene block 5b, and the height of the second layer of foamed styrene block 5b is increased. This was foam filled.

  Next, although not shown, the same operation is repeated up to the third stage, the fourth stage, ... the nth stage, and in the nth stage, which is the uppermost stage, the ceiling surface 3c and the expanded styrene block 5n In-situ foamed rigid polyurethane foam was injected into the gap and foamed and filled, and as shown in FIG. FIG. 3 is a cross-sectional view of the state of FIG.

It is drawing for demonstrating the filling construction method of the side hole grave cavity part of this invention. It is a completed drawing in the filling method of the side hole grave cavity part of this invention. It is sectional drawing in the filling method of the side hole grave cavity part of this invention. Sectional drawing in the filling method of the other side hole grave cavity part of this invention

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Side hole grave cavity part 2 Japanese paper 3a Floor surface 3b Wall surface 3c Ceiling 4 Laying sand 5 (5a-5n) Expanded styrene block 6 (6a-6n) Crevice 7 (7a-7n) In-situ foaming rigid polyurethane foam 8 Cavity hole grave cavity part Entrance

Claims (2)

After pasting Japanese paper on the surface of the hollow grave cavity, spread the first layer of foamed styrene block, and in-situ foamed rigid polyurethane in the gap formed by the wall of the hollow grave cavity and the foamed styrene flock at the end Inject foam and fill with foam to the height of the first layer of expanded styrene block,
Then, repeat the same operation as above ... up to the nth stage,
In the n-th stage, which is the uppermost stage, in-situ foamed rigid polyurethane foam is injected into the gap formed by the ceiling surface of the hollow grave cavity and the foamed styrene block, and the foam is filled up to the height of the ceiling surface. The filling method of the side hole grave cavity.   The filling method for a side hole tomb cavity according to claim 1, wherein the gap has a maximum width in the horizontal direction of 15 cm or less.