JP6853453B2 - Waterproof sheet construction method and heat insulation sheet construction method - Google Patents

Description

The present invention relates to a method for constructing a waterproof sheet and a method for constructing a heat insulating sheet.

The problem when constructing a tunnel is the treatment of spring water. Conventionally, the treatment of spring water is performed by covering the bedrock in the tunnel with a waterproof sheet having a resin sheet lined with a non-woven fabric, and then pouring concrete from above (for example, Patent Document 1).

This waterproof sheet has a vertically long rectangular shape, and a plurality of adjacent waterproof sheets are welded so that the longitudinal direction passes from the lower left end to the ceiling and reaches the lower right end in the front view of the tunnel. ..

FIG. 8 is a diagram showing a method of constructing a conventional waterproof sheet. FIG. 8 is a cross-sectional view when the wall portion of the tunnel is cut by a plane parallel to the floor surface.

As shown in FIG. 8A, the resin sheet 71, which first fixes the non-woven fabric 72 to the bedrock 2 on the inner surface of the tunnel, is partially or planarly welded to the non-woven fabric 72.

As shown in FIG. 8B, the second tarpaulin is then arranged side by side with the first tarpaulin and fixed to the bedrock 2. At this time, the ends of the resin sheet are arranged so as to overlap each other.

As shown in FIG. 8C, the welding machine 31 welds the end portion of the first resin sheet and the end portion of the second resin sheet into a so-called welcoming state in which the back surfaces are aligned with each other.

As shown in FIG. 8D, the welded portion of the resin sheet protruding toward the inside of the tunnel is bent in one direction and welded by the hot air welding machine 33.

Depending on the conventional construction method of such a conventional waterproof sheet, the bent portion 7 of the resin sheet may have a raised shape. When the bent portion rises, the portion is often caught and damaged in the subsequent process, and the waterproof effect is reduced. In addition, when the conventional method is applied to the heat insulating material spraying sheet, a cavity is formed due to the swelling of the bent portion. In this case, urethane for heat insulation is sprayed while the cavity remains, and mortar for fire resistance is further sprayed on the surface thereof. Therefore, when the lining concrete is cast on the surface of the mortar, cavities remain behind the lining concrete, making it difficult to finish the mortar with good lining concrete. Further, according to the conventional construction method, a large amount of welding margin is required.

Special Fair 7-45797

An object to be solved by the present invention is to provide a resin sheet in which the welded portions of the waterproof sheets do not rise.

The present invention is from the A-plane and the other end of a hook-and-loop fastener that is formed of a flexible resin and is placed on the surface at a first distance, leaving a length of welding allowance from one end. Provided is a resin sheet having a B-side of a hook-and-loop fastener arranged at a distance of a second distance equal to the first distance.

According to the present invention, it is possible to provide a resin sheet in which the welded portions of the waterproof sheets do not rise.

The figure which shows the structure of the waterproof sheet of 1st Embodiment. The figure which shows the tunnel which constructed the waterproof sheet on the bedrock. The figure which shows the waterproof sheet construction method of 1st Embodiment. The partially enlarged view of the joint part at the time of construction by the waterproof sheet construction method of 1st Embodiment. Partial enlarged view of the joint by the conventional waterproof sheet and the conventional waterproof sheet construction method. The figure which shows the protrusion width of a resin sheet and a non-woven fabric. The figure which shows the heat insulating material construction method of 2nd Embodiment. The figure which shows the construction method of the conventional waterproof sheet.

Hereinafter, the waterproof sheet 1 and the waterproof sheet construction method according to an example of the embodiment of the present invention will be described with reference to the drawings.

(First Embodiment)
FIG. 1 is a diagram showing a configuration of a waterproof sheet 1 according to the present embodiment. 1 (A) is a front view of the waterproof sheet 1, FIG. 1 (B) is a sectional view taken along line BB in FIG. 1 (A) of the waterproof sheet 1, and FIG. 1 (C) is a view of FIG. 1 (A) of the waterproof sheet 1. It is a CC line sectional view.

As shown in FIGS. 1 (A) to 1 (C), the waterproof sheet 1 has a resin sheet 11 formed of a flexible resin and a length of a margin for welding to the surface of the resin sheet 11 from one end. Mushroom A surface 13 which is the A surface of the hook-and-loop fastener which is arranged by the first distance D1 and the other end are arranged apart by the second distance D2 which is equal to the first distance D1. A napping B surface 14, which is the B surface of the hook-and-loop fastener, and a non-woven fabric 12 that is at least partially welded to the resin sheet 11 at the welded portion 17.

The resin sheet 11 has a vertically long rectangle and has a center mark 16 indicating a central position in a central portion in the longitudinal direction. The resin sheet 11 is made of a flexible resin such as a polyolefin resin such as VLDPE (Very Low Density Polyethylene), EVA (ethylene vinyl acetate (copolymer)), vinyl chloride and the like. It is formed of vinyl resin. The length of the resin sheet 11 in the longitudinal direction is substantially equal to the length inside the front view of the tunnel. The thickness of the resin sheet 11 is within a thickness that allows the two resin sheets 11 to be welded and welded by the welding machine 31, and is a thickness that can exhibit a waterproof function, for example, 0.8 mm to 3.0 mm.

The non-woven fabric 12 is attached to the back surface of the resin sheet 11. The non-woven fabric 12 has substantially the same shape as the resin sheet 11, is thicker than the thickness of the resin sheet 11, and has a thickness that can be easily bent, for example, a thickness of 3.0 mm to 10.0 mm. The non-woven fabric 12 may have a backing tape 15 for fixing in the central portion.

The mushroom A side 13 and the napping B side 14 each include a mushroom A side and a napping B side of a hook-and-loop fastener. A hook of the surface fastener may be used instead of the mushroom A surface 13 which is the A surface of the surface fastener, and a loop of the surface fastener may be used instead of the napping B surface which is the B surface of the surface fastener. The mushroom A surface 13 and the napping B surface 14 are adhered to the surface of the resin sheet 11. The resin sheet 11 is equal to the first distance D1 from the mushroom A surface 13 and the other end, which are arranged on the surface at a distance of the first distance D1 leaving a length of welding allowance from one end. The napping B surface 14 is provided so as to be separated by a distance D2 of 2. Therefore, when two tarpaulins 1 are arranged facing each other, the mushroom A surface 13 of the first tarpaulin 1 becomes the napping B surface 14 of the second tarpaulin 1, and the first tarpaulin 1 The napping B surface 14 faces the mushroom A surface 13 of the second waterproof sheet 1, and the two waterproof sheets 1 can be fixed by the surface fastener.

FIG. 2 is a diagram showing a tunnel in which the waterproof sheet 1 is constructed on the bedrock 2. FIG. 3 is a diagram showing a waterproof sheet construction method of the present embodiment. FIG. 3 is a cross-sectional view taken along the line AA in FIG.

As shown in FIG. 3A, first, the first waterproof sheet 1 is locked to the bedrock 2 by fixing the non-woven fabric 12 or the backing tape 15 with the anchor 18. In this state, the mushroom A surface 13 and the napping B surface 14 face the tunnel underground direction.

As shown in FIG. 3B, the second tarpaulin 1 is then placed on the mushroom A side 13 of the first tarpaulin 1, and the napping B side 14 of the second tarpaulin 1 is placed on the mushroom A side 13. The mushroom A side 13 of the second tarpaulin 1 is arranged so as to face each other on the napping B side 14 of the tarpaulin 1 of the eye, and is locked to the first tarpaulin 1. In this state, the surface of the resin sheet 11 of the first waterproof sheet 1 faces the resin sheet 11 of the second waterproof sheet 1.

As shown in FIG. 3C, the two resin sheets 11 are welded together by a welding machine 31 with the surfaces facing each other.

As shown in FIG. 3D, the second waterproof sheet 1 is peeled off from the first waterproof sheet 1 by peeling off the mushroom A surface 13 and the napping B surface 14, and the construction direction X1 of the waterproof sheet 1 is removed. Spread to. Then, the second waterproof sheet 1 is fixed to the bedrock 2 by fixing the non-woven fabric 12 and the backing tape 15 with the anchor 18. After that, the above process is repeated.

FIG. 4 is a partially enlarged view of the welded portion 4 when the waterproof sheet is constructed by the waterproof sheet construction method of the present embodiment. As shown in FIG. 4, by pulling the second waterproof sheet 1 in the construction direction X2 of the waterproof sheet 1, it is possible to prevent the welded portion 4 from rising.

Further, since the welded portion 42 comes to the end of the bent portion of the welded portion 4, it becomes easy to find a poorly welded portion in the pressure inspection. Specifically, the pressurization inspection is performed as follows.

First, both ends of the welded portion in the longitudinal direction are closed with vise pliers or the like. Next, 0.15 to 0.2 Mpa of air is press-fitted into the pressurized inspection groove 41 using an inspection needle. Then, the airtightness of the welded portion is confirmed from the holding state of the pressure.

When the pressure is not maintained, the unwelded portion is searched for by spraying soapy water or the like on the welded portion 42A inside the mine on the right side of FIG. 4, and the unwelded portion is repaired using a hot air welder or the like. If an unwelded portion is not found in the welded portion 42A inside the mine, it means that there is an unwelded portion only in the welded portion 42B on the bedrock side, so that repair is not necessary.

Here, according to the waterproof sheet 1 and the waterproof sheet construction method of the present embodiment, since the welded portion 42A inside the mine is exposed at the end portion, it is easy to confirm the unwelded portion.

FIG. 5 is a partially enlarged view of the conventional waterproof sheet and the welded portion 5 by the conventional waterproof sheet construction method. As shown in FIG. 5, according to the prior art, the well-inside welded portion 42A is hidden between the two resin sheets 11. Therefore, the confirmation of the unwelded portion must be performed while turning over the two resin sheets 11 that have been prayed and welded so as to open each other, which requires man-hours and labor.

FIG. 6 is a diagram showing the protruding widths of the resin sheet 11 and the non-woven fabric 12. In FIG. 6, anchors, hook-and-loop fasteners, and the like are omitted. As shown in FIG. 6, in the waterproof sheet 1, the resin sheet 11 protrudes from the non-woven fabric 12 at one end in the extension direction of the tunnel, and the non-woven fabric 12 is made of resin from the resin sheet 11 at the other end in the extension direction of the tunnel. It protrudes by a length shorter than the protruding width of the sheet 11.

When the construction is completed, the folded-back portion has a play width that absorbs the thickness of the resin sheet 11 and the tolerance of the resin sheet 11 in the welding width W from the end of the welded portion 42A inside the mine to the end of the welded portion 42B on the bedrock side. When added, the folding width becomes the length W + α. Therefore, the protruding width of the resin sheet 11 is 2 (W + α), which is twice the folding width.

On the other hand, the protruding width of the non-woven fabric 12 is longer than the folding width (W + α) by a length β shorter than the folding width (W + α).

If you take the length like this,
Folded width (W + α) <Non-woven fabric protruding width (W + α) + β <Resin sheet protruding width 2 (W + α)
It becomes a relationship. That is, the protruding width of the resin sheet 11 is longer than the protruding width of the non-woven fabric 12.

With such a length, the extra nonwoven fabric 12 is not folded into the folded portion, the folded portion becomes flatter, and the first nonwoven fabric 12 and the second nonwoven fabric 12 overlap each other. Therefore, there is an effect that the cushioning function of the non-woven fabric is not impaired.

As described above, the waterproof sheet 1 of the present embodiment leaves a welding margin length from one end on the surface of the resin sheet 11 formed of the flexible resin and the resin sheet 11. Welded to the resin sheet 11 and the mushroom A surface 13 arranged apart from the first distance D1 and the napping B surface 14 arranged separated from the other end by the second distance D2 equal to the first distance D1. A non-woven fabric 12 that is partially welded in the portion 17 is provided.

Further, the tarpaulin construction method of the present embodiment includes a step of fixing the first tarpaulin 1 to the bedrock 2 with the surface of the resin sheet 11 inside the mine, and A of the surface fastener of the first tarpaulin 1. The surface of the second tarpaulin 1 is aligned with the surface of the second tarpaulin, the surface of the tarpaulin, which is the surface of the tarpaulin, and the surface of the tarpaulin is the surface of the tarpaulin. The process of detachably locking the second tarpaulin 1 to the first tarpaulin 1 by aligning the mushroom A side 13 of the first tarpaulin 1 and the end of the resin sheet 11 of the first tarpaulin 1. The process of aligning the surfaces of the ends of the resin sheet 11 of the second tarpaulin 1 and welding, the process of peeling off the mushroom A surface 13 and the napping B surface 14 and spreading them in the construction direction X1, and the second sheet. The process of fixing the tarpaulin 1 to the bedrock 2 is included.

Therefore, it has the following effects.

(1) The welded portion 4 of the resin sheet 11 does not swell, and the risk of catching and damaging the resin sheet 11 is reduced.

(2) The leaked portion can be easily found in the pressure inspection of the welded portion.

(3) In the conventional construction method, the mating portion was welded to the resin sheet 11, but in the construction method of the present embodiment, this step is not required, so that the waterproof sheet 1 is damaged by being melted too much at the time of welding. There is no longer any danger of letting it go.

(4) Since the welding margin is small, the yield is improved. Specifically, the loss rate in the tunnel extension direction was 15% or more in the conventional construction method, but it becomes 5 to 10% in the construction method of the present embodiment.

(Second embodiment)
The heat insulating material construction method of the present embodiment is obtained by applying the waterproof sheet 1 and the waterproof sheet construction method of the first embodiment to the heat insulating material spraying sheet.

The structure of the resin sheet 11 of the heat insulating material spraying sheet of the present embodiment is the same as the structure of the resin sheet 11 of the waterproof sheet 1 except that the non-woven fabric 12 is not provided on the back surface.

FIG. 7 is a diagram showing a heat insulating material construction method of the present embodiment. As shown in FIG. 7A, first, the non-woven fabric 51 is spread and fixed to the bedrock 2 by using a resin disk 52 as a fixing means. Then, the resin sheet 11 is welded and fixed by the resin disk 52 and the electromagnetic induction welder 32.

As shown in FIG. 7B, the second resin sheet 11 is placed on the mushroom A side 13 of the first resin sheet 11, and the napping B side 14 of the second resin sheet 11 is the first sheet. The mushroom A surface 13 of the second resin sheet 11 is arranged so as to face the napping B surface 14 of the resin sheet 11 and pressed against the first resin sheet 11. In this state, the surface of the first resin sheet 11 faces the surface of the second resin sheet 11.

As shown in FIG. 7C, the two resin sheets 11 are welded together by a welding machine 31 with the surfaces facing each other.

As shown in FIG. 7D, the second resin sheet 11 is peeled off from the first resin sheet 11 by peeling off the mushroom A surface 13 and the napping B surface 14, and the resin sheet 11 is installed in the construction direction X3. Spread to. Then, the resin sheet 11 is fixed to the resin disk 52 by the electromagnetic induction welder 32, so that the second resin sheet 11 is fixed to the bedrock 2. After that, the above process is repeated.

As described above, the resin sheet 11 of the heat insulating material spraying sheet of the present embodiment is formed of a flexible resin, and the first distance is left on the surface for the length of the welding margin from one end. It includes a mushroom A surface 13 arranged apart by D1 and a napping B surface 14 arranged apart by a second distance D2 equal to the first distance D1 from the other end.

Further, the heat insulating sheet construction method of the present embodiment includes a step of fixing the first resin sheet 11 to the bedrock 2 by using a fixing means so that the surface is inside the mine, and a mushroom of the first resin sheet 11. Two sheets by aligning the napping B surface 14 of the second resin sheet 11 with the A surface 13 and aligning the napping B surface 14 of the first resin sheet 11 with the mushroom A surface 13 of the second resin sheet 11. The process of detachably locking the resin sheet of the eye to the first resin sheet 11 and the end of the first resin sheet 11 and the end of the second resin sheet 11 are aligned on the surface. It includes a step of welding, a step of peeling off the mushroom A surface 13 and the napping B surface 14 and spreading them in the construction direction X3, and a step of fixing the second resin sheet 11 to the bedrock 2 by using a fixing means.

In the present embodiment, the resin sheet 11 is fixed to the bedrock 2 by using the resin disk 52 as the fixing means, but the fixing method to the bedrock 2 is not limited to this method. For example, the non-woven fabric 12 can be fixed to the bedrock 2 with an arbitrary fixing tool, and can be fixed by pressing the mushroom A surface as a fixing means provided in advance on the resin sheet 11. Further, it is also possible to use both the resin disk 52 and the mushroom A surface in a mixed manner.

Therefore, it has the following effects.

(1) The welded portion 4 of the resin sheet 11 does not swell, and no voids remain on the back surface side of the resin sheet 11. Therefore, even when a heat insulating material such as urethane is sprayed and mortar for fire resistance is sprayed on the surface thereof, no cavity remains on the back of the lining concrete, and a good lining concrete can be finished. ..

(2) The welded portion 4 of the resin sheet 11 does not swell, and the risk of catching and damaging the resin sheet 11 is reduced.

(3) The leaked portion can be easily found in the pressure inspection of the welded portion.

(4) In the conventional construction method, the mating portion was welded to the resin sheet 11, but in the construction method of the present embodiment, this step is not required, so that the waterproof sheet 1 is damaged by being melted too much at the time of welding. There is no longer any danger of letting it go.

(5) Since the welding margin is small, the yield is improved. Specifically, the loss rate in the tunnel extension direction was 15% or more in the conventional construction method, but it becomes 5 to 10% in the construction method of the present embodiment.

1 Waterproof sheet 2 Bedrock 4 Welding part 5 Welding part 7 Folded part 11 Resin sheet 12 Non-woven fabric 13 Mushroom A side 14 Napping B side 15 Tape 16 Center mark 17 Welding part 18 Anchor 31 Welding machine 32 Electromagnetic induction welding machine 33 Hot air welding machine 41 Pressurized inspection groove 42 Welding part 42A Welding part inside the mine 42B Welding part on the bedrock side 51 Non-woven fabric 52 Resin disk 71 Resin sheet 72 Non-woven fabric

Claims (2)

A first distance from the A side and the other end of a hook-and-loop fastener that is formed of a flexible resin and is placed on the surface at a first distance, leaving the length of the weld margin from one end. The resin is a first waterproof sheet including a resin sheet having a B surface of a hook-and-loop fastener arranged at a distance equal to the second distance equal to and a non-woven fabric partially welded to the resin sheet at a welded portion. The process of fixing the sheet to the bedrock with the surface inside the mine,
Align the A side of the surface fastener of the first tarpaulin with the B surface of the surface fastener of the second tarpaulin, and align the B surface of the surface fastener of the first tarpaulin with the second sheet. A step of detachably locking the second tarpaulin to the first tarpaulin by aligning it with the A surface of the hook-and-loop fastener of the tarpaulin.
A step of welding the end portion of the resin sheet of the first waterproof sheet and the end portion of the resin sheet of the second waterproof sheet together with each other.
The process of peeling off the A side of the hook-and-loop fastener and the B side of the hook-and-loop fastener and expanding them in the construction direction.
The process of fixing the second tarpaulin to the bedrock and
Tarpaulin construction method including. The process of fixing the non-woven fabric to the bedrock and
The A side of the hook-and-loop fastener, which is formed of a flexible resin and is arranged on the surface at a distance of the first distance from one end, leaving a welding margin length, and the first distance from the other end. A step of fixing the first resin sheet having the B side of the hook-and-loop fasteners arranged at a distance equal to the second distance to the bedrock by a fixing means so that the surface is inside the mine.
Align the A side of the surface fastener of the first resin sheet with the B surface of the surface fastener of the second resin sheet, and align the B surface of the surface fastener of the first resin sheet with the second sheet. A step of detachably locking the second resin sheet to the first resin sheet by aligning the resin sheet with the A surface of the hook-and-loop fastener.
A step of welding the end portion of the first resin sheet and the end portion of the second resin sheet so that the surfaces are aligned with each other.
The process of peeling off the A side of the hook-and-loop fastener and the B side of the hook-and-loop fastener and expanding them in the construction direction.
A step of fixing the second resin sheet to the bedrock using the fixing means, and
Insulation sheet construction method including.

Images