JP3738354B2 - Waterproof sheet laying method and sheet edge processing apparatus - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention is a waterproof sheet laying construction method suitable for waterproofing or water shielding of tunnels, shafts, waterways, garbage disposal sites, etc., and more specifically, heat-sealable waterproof sheets are overlapped in the form of roof tiles and stretched to construction sites, The present invention relates to a waterproof sheet laying construction method and a sheet end processing apparatus in which the overlap portion is welded and joined in a belt shape along the length direction of the portion by a welding machine.
[0002]
[Prior art]
For example, as shown in FIG. 7, the waterproof sheet laying construction method is a tunnel sheet waterproofing method in which a heat-weldable waterproof sheet A is stretched over a nonwoven fabric stretched on a sprayed concrete surface that is a primary lining surface of a tunnel ground. As shown in FIG. 8, it is adopted in a water shielding work in which a waterproof sheet A is stretched on a slope such as a general treatment plant. In any case, as shown in FIG. 9, the waterproof sheet A is stretched in a roof tile shape so that the end portions overlap each other in the warp direction and the weft direction, and the overlap portion A1 uses a welding machine 100. Further, as shown in FIG. 7 and FIG. 8, the portion X where the corner portions of the waterproof sheet A overlap is overlapped.
[0003]
On the other hand, the welder 100 of the waterproof sheet A shown in FIG. 10 and FIG. 11 is a self-propelled type, and a pair for compressing the wheel (auxiliary wheel) 101 and the overlap portion A1 of the two waterproof sheets A. Pinch rolls 102, 102, an electric heating type hot plate (not shown) disposed near the pinch roll 102 in front of the pinch roll 102, and a handle 103. Then, the welding machine 100 travels in the direction of the arrow shown in the figure while the other pinch roll 102 rotates together with the rotational drive of one pinch roll 102, and after the waterproof sheet A is melted by the hot water, the pinch roll 102 By overlapping the overlap portion A1, the overlap portions B of the two waterproof sheets A are welded.
[0004]
The welding machine 100 also includes an end portion of the waterproof sheet A that overlaps the lower portion and an end portion of the waterproof sheet A that overlaps the upper portion in order to compress the overlap portion B of the two waterproof sheets A to be welded by the pinch roll 102. It has a frame structure in which the part can be inserted in the left-right direction, and the end portion of the waterproof sheet A is used as a guide when moving by itself.
[0005]
And the overlap part A1 of the longitudinal direction and the weft direction of the waterproof sheet A is welded in a belt shape along the length direction of the part A1 by the welding machine 100, and the laying of the water sheet A in the weft direction is preceded. For example, after the overlap portion A1 of the waterproof sheet A arranged in the weft direction is welded, the end portion of the waterproof sheet A that is overlapped in the warp direction, that is, the overlap portion A2 is welded. As shown in FIG. 11, unwelded ears B1 remain on both sides of the welded portion B in the overlapped portion A1 of the waterproof sheet A that is overlapped two in the weft direction or the warp direction. The central portion of the overlap portion A1 (welded portion B) is a non-welded portion, and an air check groove B2 is formed by the non-welded portion. Then, air is passed through the air check groove B2, and whether or not the air pressure in the air check groove B2 is maintained at a predetermined value for a predetermined time is determined to determine whether or not the welded state of the welded portion B is good.
[0006]
As described above, since the non-welding ear B1 remains in the configuration of the welding machine 100, when the two waterproof sheets A are first welded and then the other waterproof sheet A is stacked and welded. When the welding machine 100 crosses the two-layer welding part B, the non-welding ear part B1 is caught in the sheet insertion gap of the welding machine 100, thereby obstructing the crossing of the welding machine 100, and the other one waterproof sheet. There was a problem that the sheet A could not be welded. Note that the same problem occurs even if the waterproof sheet A is preceded in the warp direction.
[0007]
Therefore, in the conventional waterproof sheet laying construction method, as shown in FIG. 12, before the third waterproof sheet A is welded, the non-welding ears of the two waterproof sheets A are attached to the portion where the three sheets are stacked. The part B1 was excised from the root (see, for example, Patent Document 1).
[0008]
However, while the waterproof sheet A is thick and excellent in waterproofness and tear strength, the excision work of the waterproof sheet A is performed manually with a tool, and after excision, the excised surface is smoothed with a sander. It is necessary to. Therefore, the excision work of the waterproof sheet A becomes extremely inefficient, and when excising the non-welding ear portion B1 of the three-layered part, the work is performed by estimating the three-layered part. Since the operation depends on intuition to be performed, there is a problem in that excess or deficiency occurs in the non-welded ear B1 to be excised.
[0009]
[Patent Document 1]
Japanese Patent Publication No. 7-72479 (all pages, FIG. 2, FIG. 4, FIG. 5)
[0010]
[Problems to be solved by the invention]
The present invention provides a waterproof sheet laying construction method and a sheet edge processing apparatus that can easily and reliably process a three-layered waterproof sheet without excising a non-welded ear.
[0011]
[Means for Solving the Problems]
In the waterproof sheet laying construction method of the present invention, two heat-weldable waterproof sheets are arranged side by side so that the end portions overlap each other, and the end portions of the waterproof sheet are welded along the overlap portions. the welded portion of the strip-shaped non-weld ears remains formed on both sides by, then the the side edges along the arrangement direction of the tarpaulin to overlap the side edges of the other of the waterproof sheet, the other waterproof in the waterproof sheet laid construction methods to weld the entire length of the overlap portion of the sheet, after the non-welded ears, to form ears welded portion welded to the tarpaulin between which overlap to form a non-welded ears The side welded portion of the waterproof sheet is overlapped with the ear welded portion.
[0012]
In the sheet edge processing apparatus of the present invention, two heat-weldable waterproof sheets are arranged side by side so that the ends overlap each other, and the ends of the waterproof sheets are welded along the overlap. A sheet end processing apparatus used in a waterproof sheet laying construction method for forming a belt-like welded portion in which a non-welded ear portion remains on both sides, the non-welded ear portion positioned on one side of the welded portion. The first hot metal welded to the waterproof sheet that overlaps the non-welding ear and the first scissor holder opposed thereto, and the non-welding ear located on the other side of the welded part overlaps the non-welding ear. A second hot metal welded to the waterproof sheet, a second hot metal receptacle opposite to the second hot metal, a heating means for heating the first and second hot metal, the first and second hot metal, and the first and second And a driving means for bringing the second saddle receiver into proximity and separation. And wherein the door.
[0013]
In addition, the first hot metal melts the non-welding ear part located on one side of the welded part and welds it to the waterproof sheet, and the second hot metal is located on the other side of the welded part. It is desirable that the non-welding ear is melted and welded to the waterproof sheet.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
[0015]
FIG. 1 shows a sheet end processing apparatus C used in a waterproof sheet laying construction method, and non-welding ears B1 on both sides of a welded part B of a heat-weldable waterproof sheet A formed as described above. This is for welding to the waterproof sheet A that overlaps the welding ear B1.
[0016]
The sheet edge processing apparatus C includes a first hot metal 1, a metal plate-shaped first hot metal receiver 1 a facing the first hot metal 1, a second hot metal 2, and the second hot metal 2. A metal plate-like second metal plate receiver 2a opposite to the first plate, an electric heater (not shown) that heats the first and second hot metal plates 1 and 2, an example of the heating device, An upper support 3 that supports the two rod holders 2a, a lower support 4 that supports the second hot rod 2 and the first rod receiver 1a, and a drive cylinder that brings the upper support 3 and the lower support 4 close to and away from each other. (An example of a drive means) 5, The cooling means which cools the non-welding ear | edge part B1 of the waterproof sheet A fuse | melted with the 1st and 2nd hot irons 1 and 2 is provided.
[0017]
The upper support 3 is formed by filling a metal box-shaped main body 6 opened downward with a refractory material 7, and the first support 1 and the second support 2a are fixed to the upper support 3. The first hot metal 1 is disposed so as to be inclined with respect to the second hot metal receiver 2a.
[0018]
The lower support 4 is formed by filling a metal box-shaped main body 8 opened upward with a refractory material 7, and the second support 4 and the first support 1a are fixed to the lower support 4. The second hot metal 2 is disposed to be inclined with respect to the first hot metal receptacle 1a.
[0019]
A sheet adhesion preventing layer 10 made of a Teflon (R) sheet or the like is formed on the sheet contact surfaces of the first and second hot metal rods 1 and 2 and the sheet contact surfaces of the first and second rod holders 1a and 2a, respectively. ing.
[0020]
The upper support 3 is attached to the upper frame 11, and the lower support 4 is attached to the lower frame 12. The rear sides of the upper and lower frames 11 and 12 are connected to the connecting frame 13 so that a predetermined interval is provided between the upper support 3 and the lower support 4, and the front of the sheet end processing apparatus C is indicated by an arrow D. The waterproof sheet A is inserted between the upper and lower supports 3 and 4. The connecting frame 13 is detachably attached to the upper and lower frames 11 and 12 by a connecting tool such as a screw, and the front sides of the upper and lower frames 11 and 12 are connected to each other as shown by a two-dot chain line in FIG. The waterproof sheet A can be inserted between the upper and lower supports 3 and 4 from the rear side of the sheet end processing apparatus C by connecting with each other. A cooling port portion 14 of the cooling means is attached to the connecting frame 13, and a cooling hose (not shown) for sending cooling air is connected to the cooling port portion 14.
[0021]
The drive cylinder 5 moves the upper support 3 so as to approach and separate from the lower support 4. The drive cylinder 5 is fixed to the upper frame 11, and the tip of the piston rod 5 a of the drive cylinder 5 extends from the upper frame 11. It protrudes downward and is fixed to the upper support 3. The upper support 3 and the lower support 4 are fixed, and the first hot rod 1 and the second hot plate receiver 2a (or the second hot plate 2 and the first hot plate receiver 1a) are moved by the drive cylinder 5. Also good.
[0022]
Further, the first hot metal 1 is separated from the upper support 3 to form a gap between the first hot metal 1 and the upper support 3, and the second hot metal 2 is separated from the lower support 4 to be second. A gap may be formed between the hot metal 2 and the lower support 4, and cooling air may flow through these gaps.
[0023]
As shown in FIG. 4 (a), the waterproof sheet laying method is such that after the waterproof sheet A is laid in advance in the weft direction, the overlap portion A1 of the waterproof sheet A aligned in the weft direction using the welding machine is provided. A belt-like welded portion B is formed by welding and leaving the non-welded ears B1 on both sides. One non-welding ear portion B1 is located on the front surface side of the waterproof sheet A continuous body by the welding portion B, and the other non-welding ear portion B1 is located on the back surface side of the waterproof sheet A continuous body.
[0024]
Next, as shown in FIG. 4 (b), by using the sheet end processing apparatus C, on both sides of the end of the welded portion B of the overlap portion A1 (the portion where the third waterproof sheet A overlaps). The welded part B2 is formed by welding the formed non-welded ear part B1 to the waterproof sheet A overlapping the non-welded ear part B1.
[0025]
That is, as shown in FIGS. 2 and 3, the waterproof sheet A is inserted between the upper and lower supports 3 and 4 of the sheet end processing apparatus C, and the non-welding ears B1 remaining on both sides of the welding part B The waterproof sheet A positioned on the surface side of the continuous sheet of the waterproof sheet A and the waterproof sheet A overlapping the non-welded ear part B1 are sandwiched between the first hot rod 1 and the first brim receiver 1a, and the first hot rod 1 To melt the non-welding ear B1. Further, the non-welding ear A1 positioned on the back side of the continuous sheet of the waterproof sheet A and the waterproof sheet A overlapping the non-welding ear A1 are sandwiched by the second hot metal 2 and the second hot metal receiver 2a, and the second hot metal 2 melts the non-welding ear B1. As a result, as shown in FIG. 3, the non-welding ear B1 is chamfered by the first and second hot irons 1 and 2 and welded to the waterproof sheet A, and the three-layer overlapped portion of the waterproof sheet A The level difference due to the non-welding ear B1 and the non-welding ear B1 is eliminated.
[0026]
In addition, about the heating temperature and heating time of the non-welding ear | edge part B1, for example, when the material is polyethylene (PE) and the waterproof sheet A having a thickness of 1.5 mm, the heating is performed at a temperature of 350 ° C. for 1 minute and 30 seconds. When the waterproof sheet A is made of high density polyethylene (HDPE) and has a thickness of 2 mm, it is heated at a temperature of 300 ° C. for 40 seconds.
[0027]
Next, as shown in FIG. 4C, a waterproof sheet A is laid in the warp direction, and the end of the waterproof sheet A and the end of the waterproof sheet A that has already been welded and continue in the weft direction are overlaid. The overlap part A1 is welded by using the welding machine and moving the welding machine using the end part of the waterproof sheet A as a guide as described above. In this case, since the non-welding ear portion B1 of the waterproof sheet A continuous in the weft direction has been eliminated, the movement of the welding machine is not hindered by the non-welding ear portion B1, and three sheets of the waterproof sheet A are stacked. The parts can be welded and joined smoothly. Moreover, since a water passage space is not formed on the back surface of the non-welding ear B1, it is possible to prevent water leakage from occurring in the overlap portion A1 of another waterproof sheet A through this.
[0028]
FIG. 5 shows how the end portions of the waterproof sheet A are overlapped, and FIG. 5 (b) is upside down with respect to FIG. 5 (a). In the case where the form in which the waterproof sheets A are stacked is turned upside down, the connecting frame 13 of the sheet end processing apparatus C is replaced as described above to enable the insertion of the waterproof sheet A from the reverse direction. .
[0029]
FIG. 6 shows an application example to a construction method in which a buffer layer 201 such as a nonwoven fabric is formed on the surface of the spray concrete 200 of the tunnel, and the waterproof sheet A is laid on the surface of the buffer layer 201. FIG. 7 shows an example of application to a construction method in which a protective mat 301 is covered on an inclined ground 300 of a disposal site, and a waterproof sheet A is laid on the surface of the protective mat 301.
[0030]
The sheet edge processing apparatus C is not limited to the above.
[0031]
【The invention's effect】
According to the laying construction method of the waterproof sheet of the present invention, the non-welded ear portion of the waterproof sheet is welded to the waterproof sheet overlapping the non-welded ear portion, so that the non-welded ear portion is eliminated from the non-welded ear portion. The excision work of the non-welding ear is not necessary, and the processing of the three-layered portion of the waterproof sheet can be performed easily and reliably.
[0032]
According to the sheet edge processing apparatus of the present invention, the overlap portion of the waterproof sheet is inserted between the first and second hot rods and the first and second rod holders, By sandwiching, the non-welding ears on both sides of the welding portion can be welded to the waterproof sheet at the same time, and the processing of the non-welding ears can be performed quickly.
[0033]
In addition, the first hot metal contacts the non-welded ear portion located on one side of the welded portion and melts the non-welded ear portion, and the second hot metal is located on the other side of the welded portion. The non-welded lug is brought into contact with the non-welded lug, and the non-welded lug is melted. The first hot metal bowl and the second hot metal bowl are supported by an upper support, and the first hot metal bowl and the second hot metal bowl are lower. If it is supported by a support and the upper support and the lower support are brought close to and separated from each other by the driving means, they are located on the non-welded ear portion and the back side of the overlap portion of the waterproof sheet. The non-welding ear can be welded simultaneously, and the non-welding ear can be processed quickly.
[Brief description of the drawings]
FIG. 1A is a front view of a sheet edge processing apparatus according to an embodiment of the present invention, FIG. 1B is a front view thereof, and FIG. 1C is a view as viewed in the Y direction of FIG.
FIG. 2 is an explanatory diagram of use of the sheet edge processing apparatus.
FIG. 3 is a diagram illustrating use of the sheet edge processing apparatus.
FIG. 4 is a front view showing a method for laying a waterproof sheet according to an embodiment of the present invention.
FIG. 5 is a perspective view showing how the end portions of the waterproof sheet are stacked.
FIG. 6 is a cross-sectional view showing a method for laying a waterproof sheet according to an embodiment of the present invention.
FIG. 7 is a perspective view showing a construction state of the waterproof sheet.
FIG. 8 is a perspective view showing another construction state of the waterproof sheet.
FIG. 9 is a front view showing a construction state of the waterproof sheet.
FIG. 10 is a perspective view showing a construction method of a waterproof sheet using a welding machine.
FIG. 11 is a perspective view showing a construction method of a waterproof sheet using a welding machine.
FIG. 12 is a perspective view showing a conventional waterproof sheet laying method.
[Explanation of symbols]
A Waterproof sheet A1 Overlap part B Welding part B1 Non-welding ear part C Sheet end processing apparatus 1 1st hot metal 1a 1st hot metal receiver 2 2nd hot metal 2a 2nd hot metal receiver 3 Upper support 4 Lower support

Claims (3)

Two heat-weldable waterproof sheets are arranged side by side so that the end portions overlap each other, and the end portions of the waterproof sheet are welded along the overlap portions, thereby leaving unwelded ears on both sides. forming a strip-shaped welded portion, then said to overlap the side edges of the other of the waterproof sheet to the side edges along the arrangement direction of the tarpaulin, welded over the entire length of the overlap portion between the other tarpaulin In the waterproof sheet laying construction method to
After forming the ear welded portion by welding the overlapped waterproof sheets forming the non -welded ear to the non-welded ear, the side weld of the other waterproof sheet overlaps the ear welded portion. A waterproof sheet laying construction method characterized in that it is made to do. Two heat-weldable waterproof sheets are arranged side by side so that the end portions overlap each other, and the end portions of the waterproof sheet are welded along the overlap portions, thereby leaving unwelded ears on both sides. A sheet edge processing device used in a waterproof sheet laying construction method for forming a belt-like welded portion,
A first hot metal which welds the non-welded lug located on one side of the welded part to the waterproof sheet overlapping the non-welded lug, a first brim receptacle facing the first hot metal, and the other side of the welded part A second hot metal which welds the non-welded ear part positioned on the waterproof sheet overlapping the non-welded ear part, a second hot metal receptacle facing the second hot metal, and a heating means for heating the first and second hot metal And a sheet end portion processing apparatus comprising: drive means for bringing the first and second scissors and the first and second scissors receptacles close to and away from each other.   The first hot metal melts the non-welding lug located on one side of the welded portion and welds it to the waterproof sheet, and the second hot metal is located on the other side of the welded portion. The sheet end processing apparatus according to claim 2, wherein the welding edge portion is melted and welded to the waterproof sheet.

Images