JP2001248270A - Sheet waterproofing method, and band-shaped auxiliary device therefor and hot air melting machine used therefor - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an excellent waterproof method which does not cause wrinkles in the vicinity of joint portion of a waterproof sheet, a band-shaped auxiliary device and a hot air melting machine used therefor. SOLUTION: End portions of the waterproof sheets 1, 1' are overlapped and the overlapped portion 1a is jointed by heat melting, in this case, the overlapped portion 1a is covered with a flexible band-shaped auxiliary device 10, and hot air is injected into a space between the waterproof sheets 1 and 1' in the overlapped portion.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sheet waterproofing method in which a joint of a waterproof sheet has a good finish, a band-shaped auxiliary tool used therefor, and a hot air welding machine.

[0002]

2. Description of the Related Art As an example of a method of waterproofing a rooftop of a building, a polyvinyl chloride rubber (PVC rubber) has been conventionally used.
There is known a method (sheet waterproofing method) of applying a waterproof sheet such as that described above to a base surface by bonding or mechanical fixing. In these methods, it is necessary to overlap the edge portion of the waterproof sheet with the edge portion and join the overlapping portions, and the joining is usually performed by a solvent bonding method using tetrahydrofuran (THF). I have.

However, since the waterproof sheet using the PVC rubber contains chlorine atoms, dioxin may be generated if not properly treated at the time of disposal, which is not preferable in terms of environmental protection. There is a problem that THF used at the time of joining evaporates and a solvent odor is generated, and it is easy to catch fire and is dangerous. In addition, suction of THF vapor tends to cause drunkenness, which poses a problem that working at heights is dangerous for workers.

Accordingly, the present applicant has proposed a waterproof sheet as
By using a special sheet made of a polymer material mainly composed of an olefin-based thermoplastic elastomer at least on the front and back surfaces, the ends of the waterproof sheet can be easily and safely joined by heat fusion without solvent bonding. An excellent sheet waterproofing method that can be used has been developed and has already been filed (Japanese Patent Application No. Hei 10-235937, filed on August 21, 1998).

[0005]

However, in the above-mentioned joining by heat fusion, as shown in FIG.
The hot air blow-out nozzle 2 of the hot air fusing machine is inserted into the overlapping portion 1a of the ends of the 1 'and the hot air is supplied while hot air is being supplied thereto. Instead, the portions near the waterproof sheets 1 and 1 ′ are stretched by thermal expansion and are pulled, and after the construction, the portions near the waterproof sheets 1 and 1 ′, particularly hot air, enter from the inside along the joints. It was found that the area where heat was trapped became wavy and wrinkled. The wrinkles are indicated by 4. When the wrinkles 4 are generated in this way, it is not preferable from an aesthetic point of view, and there is a problem that rainwater or the like accumulates in the concave portions, and a problem that a local stress load is applied to the waterproof sheets 1 and 1 ′, leading to early deterioration of the portions. Therefore, a solution is strongly desired.

The present invention has been made in view of such circumstances, and an excellent sheet waterproofing method which does not cause wrinkles around a joint portion of a waterproof sheet, a band-shaped auxiliary tool used therefor, and hot air fusion used therefor Its purpose is to provide machines.

[0007]

In order to achieve the above object, the present invention provides a waterproofing method for laying and installing a waterproof sheet directly on a base surface or via an insulating sheet. When joining the overlapping portions by heat fusion, heat is concentrated only on the overlapping portions, and heat is prevented from diffusing to other portions. A first gist is a sheet waterproofing method in which hot air is blown to fuse the above-mentioned overlapping portions.

The present invention also provides a waterproofing method for laying a waterproofing sheet directly or via an insulating sheet on a ground surface, wherein the edges of the waterproofing sheet are overlapped with each other, and the upper edge of the upper waterproofing sheet in the overlapping portion. When a band of a predetermined width along the part is joined by heat fusion, heat is concentrated on only the above-mentioned band, and heat is prevented from diffusing to other parts, and the waterproof sheet and the waterproof of the band are waterproof. A second gist of the present invention is a sheet waterproofing method in which hot air is blown between sheets to fuse them.

Further, the present invention provides a waterproofing method in which a waterproof sheet is laid directly on a base surface or via an insulating sheet, wherein the ends of the waterproof sheet are overlapped with each other, and the entire overlapping portion or the upper portion of the overlapping portion is provided. When a predetermined width of the strip along the edge of the waterproof sheet is joined by heat fusion, the waterproof sheet of the portion to be thermally fused is covered with the flexible part to be thermally fused. A third aspect of the present invention is a sheet waterproofing method in which hot air is blown between the sheet and the waterproof sheet to fuse the two.

The present invention relates to an auxiliary tool used for the sheet waterproofing method according to the second and third aspects, wherein the auxiliary tool has a belt-like shape and is formed by a spring-type hardness test type A according to JIS K6301. Is 50-75, specific gravity is 0.
A band-like auxiliary tool having a size of 9 to 1.4 is defined as a fourth gist.

The present invention also provides a waterproofing method for laying a waterproofing sheet directly or through an insulating sheet on a ground surface, wherein the waterproofing sheet has ends overlapped with each other, and the entire overlapping portion or the upper portion of the overlapping portion is provided. When joining a band-shaped portion having a predetermined width along the edge portion of the waterproof sheet by heat fusion, an adjacent area shifted from the heat-sealing scheduled portion toward the upper waterproof sheet is pressed from above with a band-shaped auxiliary tool. A fifth aspect of the present invention is a sheet waterproofing method in which hot air is blown between the waterproof sheet and the waterproof sheet in a portion to be heat-sealed to fuse the two sheets in a state where they are urged. An annular band, pressing means for constantly pressing and pressing a predetermined length of the outer peripheral surface of the band downward, and pressing the band by the pressing means. The band aid that includes a holding means for holding the circumferential direction so as to be rotatable with Chi and sixth gist of the.

The present invention relates to a self-propelled hot-air fusing machine used in the above-mentioned sheet waterproofing method, wherein a plurality of compaction rolls which run while applying a load to a portion to be subjected to heat fusing between ends of the waterproof sheet are provided. A main body portion to which a roller is attached, and a hot-air blowing nozzle set so that a root portion is attached to the main body portion and a tip nozzle opening is set to be inserted between the waterproof sheet and the waterproof sheet of the portion to be heat-sealed, In the main body,
The band-shaped auxiliary tool always presses a predetermined length portion of the outer peripheral surface of the band-shaped body against an adjacent area displaced toward the upper waterproof sheet from a portion to be heat-sealed where the rolling roller runs. A seventh aspect of the present invention is a hot-air fusing machine attached so as to follow the vehicle in a state where the vehicle is running.

[0013]

Next, an embodiment of the present invention will be described.

First, the waterproof sheet used in the present invention is:
Any material can be used as long as it can be joined by heat fusion, but for example, it is preferable to use a sheet made of a polymer material mainly containing an olefin-based thermoplastic elastomer. is there.

The above-mentioned olefin-based thermoplastic elastomer (hereinafter abbreviated as "TPO") is a polymer material which comprises a thermoplastic olefin-based resin and a rubber component, is moldable at high temperatures, and exhibits rubber elasticity at room temperature. . As the olefin resin component, polyethylene, polypropylene, or the like is used, and as the rubber component, ethylene-propylene-diene rubber (EPDM), butadiene rubber, isoprene rubber, or the like is used. Both the resin component and the rubber component may be used alone or in combination of two or more. Especially, what consists of polypropylene and EPDM is used suitably. In particular, for the purpose of improving solvent resistance, oil resistance, and mechanical properties such as fatigue resistance and compression resistance, it is preferable to use a partially cross-linked resin and rubber blend. It is also possible to use a resin-rubber blend type in which the technique of dynamic cross-linking is adopted for rubber blended with rubber. Alternatively, a TPO type in which an olefin-based monomer gas is directly polymerized in a reactor to obtain a resin component and a rubber component simultaneously may be used. In this case, generally, the resin component is polypropylene and polyethylene, and the rubber component is ethylene-propylene rubber.

The waterproof sheet used in the present invention does not need to be entirely formed of a heat-fusible polymer material such as the above-mentioned TPO. For example, a sheet whose front and back surfaces are made of a polymer material containing TPO as a main component (hereinafter referred to as “TPO”)
Sheet), or a single-layer sheet composed of only the above-mentioned TPO sheet,
Meanwhile, a laminated sheet in which one or more sheets other than the TPO sheet are laminated may be used.

The thickness of the waterproof sheet used in the present invention, whether it is a single-layer sheet or a laminated sheet, is usually 0.7 to 5.0 mm, especially 1.0 to 3.0 mm.
It is preferable to set it to 0 mm. That is, 0.7
If it is less than 5 mm, it is lightweight, but it may lack reliability as a waterproofing material. Conversely, if it exceeds 5.0 mm, the reliability as a waterproofing material increases, but the weight is large and handling at the time of work deteriorates. It is not economical.

In the sheet waterproofing method of the present invention, when joining the waterproof sheets made of the heat-fusible material, for example, as shown in FIG. 1A, heat is concentrated only on the overlapping portion 1a. And hot air is blown between the waterproof sheet 1 and the waterproof sheet 1 ′ of the overlapping portion 1 a while blocking the diffusion of heat to other portions, so that the overlapping portion 1 a is fused. . That is, as shown in FIG. 1 (b), when the hot air diffuses widely over the overlapping portion 1a and into the lower gap of the upper waterproof sheet 1 ', the waterproof sheet 1' is thermally expanded over a wide range, This is because it causes wrinkles. The hot air blowing region is indicated by S. On the other hand, in the present invention, as shown in FIG. 1A, the hot air blowing region S is limited to the overlapping portion 1a to be thermally fused.

As described above, the following two methods are conceivable as methods for concentrating the heat of the hot air only on the overlapping portion 1a and not diffusing it to other portions. That is, in the first method, the overlapping portion 1 of the two waterproof sheets 1 and 1 'is used.
A method is adopted in which a load is applied to the entire a from the top in advance, and a hot-air blowing nozzle 2 is inserted against the load to perform a heat-sealing operation, thereby preventing the upper waterproof sheet 1 ′ from rising around it. is there. The second method is
A load is applied from above to an adjacent region shifted from the overlapping portion 1a of the two waterproof sheets 1 and 1 'toward the upper waterproof sheet 1', and the front and rear portions of the overlapping portion 1a where the hot air blowing nozzle 2 is inserted, This is a method in which the upper waterproof sheet 1 'is prevented from being lifted around the periphery thereof by pressing with a pressure roller or the like of a heat fusing machine.

When the first method is performed, as shown in FIG. 2, it is preferable to use a band-shaped auxiliary tool 10 capable of covering the entire overlapping portion 1a of the waterproof sheets 1 and 1 '. However, the phrase “covering the entirety” does not necessarily mean that it is necessary to cover the entire lengthwise overlapping portion 1a in the longitudinal direction.
At the time of the heat fusion work, it suffices to cover the overlapping portion 1a to be joined by blowing hot air.

Such a band-shaped auxiliary tool 10 has a certain flexibility and weight so that it can be overlapped with the waterproof sheets 1 and 1 'along the steps of the overlapping portion 1a and the unevenness of the base surface. It is necessary.

That is, the degree of the "flexibility" is determined by JI
SK6301 is required to have a hardness in the range of 50 to 75 according to a spring type hardness test A type. If the above-mentioned value is less than 50, the pressure roller 3
When rolling is applied (see FIG. 17), the rolling roller 3 bites into the belt-shaped auxiliary tool 10 and does not rotate smoothly, so that the rolling pressure becomes uneven and wrinkles are likely to occur. On the other hand, a hard material having the above value of more than 75 has poor followability to the waterproof sheet 1 and does not easily overlap the waterproof sheet 1, so that the effect of preventing wrinkles cannot be obtained.

In order to apply a certain weight to the overlapping portion 1a of the waterproof sheet 1 in the above-mentioned band-shaped auxiliary tool 10, it depends on the size and thickness of the band-shaped auxiliary tool 10. In consideration of the handling workability and the like, it is optimal to set the specific gravity to 0.9 to 1.4. That is, when the specific gravity is less than 0.9, the load of the band-shaped auxiliary tool 10 is insufficient, and the effect of the present invention is insufficient. On the other hand, when the specific gravity is more than 1.4, the handling workability is poor and not practical. Because.

The band-shaped auxiliary tool 10 may be made of any material as long as it has the above-mentioned flexibility and weight. , A resin elastomer or the like is used. For example, butyl rubber (IIR), EPDM, or a blend thereof, or a blend thereof in which a resin is blended at a predetermined ratio as a main component, and a vulcanizing agent, a vulcanization accelerator, a process oil, carbon black, an inorganic material, A material obtained by adding a filler or the like and vulcanizing and forming into a belt shape by a known method can be suitably used.

Further, the dimensions of the band-shaped auxiliary device 10 are appropriately set according to the type of the waterproof sheet 1, the width of the overlapping portion 1a, and the like, but the width (indicated by W in FIG. 3) is usually set. It is preferable to set the length to about 1.5 to 5 times the width of the overlapping portion 1a. That is, if the width W of the band-shaped auxiliary tool 10 is too short with respect to the width of the overlapped section 1a, it is difficult to completely cover the overlapped section 1a from above, and the effect of overlapping the band-shaped auxiliary tool 10 cannot be obtained much. It is. On the other hand, if the width W of the band-shaped auxiliary tool 10 is too long with respect to the width of the overlapping portion 1a, the work of laying the band-shaped auxiliary tool 10 is not easy, and further effects cannot be obtained at the cost of material cost, which is not economical. Because.

The thickness (indicated by T in FIG. 3) of the band-shaped auxiliary tool 10 depends on the material thereof, but is usually 3 to 10 mm.
It is preferable to set it to 10 mm, especially about 4 to 6 mm. That is, if the thickness is too thin, the band-shaped auxiliary tool 1
0 is too light, easily slips from the overlapping portion 1a of the waterproof sheet 1, and does not easily overlap with this. On the other hand, if the thickness is too large, the workability and the economic efficiency deteriorate as in the case where the width W is too long. However, the band-shaped auxiliary tool 10
May be set to the above-mentioned suitable thickness by stacking and laminating a plurality of thin sheets having a thickness of, for example, 1 mm.

The longitudinal one edge 10a (see FIG. 2) of the band-shaped auxiliary device 10 may be arranged so as to be aligned with the one edge of the waterproof sheet 1 'arranged above the waterproof sheet overlapping portion. preferable. That is, since the hot air blowing nozzle 2 (see FIG. 4) is inserted from the edge side, if the belt-shaped auxiliary tool 10 is protruded from one edge of the waterproof sheet 1 ', workability is reduced. is there. The other edge portion 10b in the longitudinal direction of the band-shaped auxiliary tool 10 is shifted laterally from the overlapping portion 1a of the waterproof sheets 1 and 1 ', and is provided on the base surface or the insulating sheet of the waterproof sheet 1' arranged on the upper side. It is preferable to set so as to overlap with the contacting part.
By doing so, it is possible to press the portion where the hot air easily enters from above, thereby completely blocking the surrounding gap.

Using the band-shaped auxiliary tool 10, the ends of the waterproof sheets 1 and 1 'can be joined together as follows. That is, as shown in FIG. 4, similar to a normal sheet waterproofing method, a general base material 11 such as concrete is used.
First, the insulating sheet 12 is laid, and the first
The waterproof sheet 1 is laid. Then, the end of the second waterproof sheet 1 'is overlapped with the end of the first waterproof sheet 1 to form an overlap portion 1a to be joined.

Next, the band-shaped auxiliary tool 10 is superimposed on the overlapping portion 1a so that the overlapping portion 1a is completely covered. In this state, as shown in FIG. Of the nozzle opening 2
a, while blowing and supplying hot air,
Apply compaction from above. By performing this operation while moving little by little along the longitudinal direction, the entire overlapping portion 1a can be thermally fused and joined.

When the ends of the waterproof sheets 1 and 1 'are joined in this manner, wrinkles (see FIG. 17) as in the related art are not generated at all around the joined portions, and a good finish is obtained. This is because the overlapping portion 1a of the waterproof sheets 1 and 1 'is pressed from above by using the band-shaped auxiliary tool 10,
It is considered that even if the hot air blowing nozzle 2 is inserted, no extra space is formed except for the inserted portion.

That is, the hot air is supplied to the hot air blowing nozzle 2
Fills the minimum space formed around the insertion tip, and prevents diffusion to other parts. Is hardly affected by heat. Therefore, it is considered that thermal expansion does not occur in the peripheral waterproof sheets 1 and 1 ', and the generation of wrinkles is suppressed. Then, the hot air is concentrated on the portion to be heat-sealed and the heat efficiency is improved, so that the heat-sealing operation can be performed more quickly than in the past. In the portion to be heat-sealed, the temperature rises sharply, and the waterproof sheets 1 and 1 ′ tend to be greatly deformed by thermal expansion in that portion, but are subjected to the load of the band-shaped auxiliary tool 10 overlapping thereover. For,
No displacement occurs, and heat fusion is performed while maintaining the same clean state as before heating. This is also considered to be one of the causes of no wrinkles around.

The hot-air fusing machine used for the sheet waterproofing method may be any known hot-air fusing machine. It may be of the traveling type.

The conditions for the heat-sealing are not particularly limited, and are appropriately set according to the material and thickness of the waterproof sheets 1 and 1 '. For example, when joining a waterproof sheet made of a polymer material containing TPO as a main component, it is preferable to set the blowing temperature at 500 to 700 ° C., especially 550 to 650 ° C. It is a traveling type, and it is preferable to set the temperature at 400 to 600 ° C, especially 450 to 550 ° C. Further, the fusing speed is of a hand type, and is 0.5 to 2.0 m / min.
It is preferable to set the speed to 7 to 1.0 m / min, and it is a self-propelled type and 3.0 to 6.0 m / min, especially 3.5.
It is preferable to set it to 5.0 m / min. Since the work stability of the self-propelled type is better than that of the hand type, the above-described difference occurs in a suitable range. Here, “work stability” means that the bonding reliability of the heat-sealed portion is high. In other words, while the self-propelled type can control the width for performing the heat fusion, the heating temperature of the fusion portion, and the self-propelling speed constantly, the hand-type type is difficult to keep these constant. Therefore, in order to enhance the bonding reliability, the heat fusion must be performed slowly.

On the other hand, when performing the second method, it is preferable to use a self-propelled hot-air fusion machine 50 as shown in FIG. 5, for example. That is, the hot air fusion machine 50
Similar to a normal self-propelled hot-air fusing machine, it runs while applying a load to the overlapping portion 1a of the waterproof sheets 1 and 1 'to be joined for the purpose of preventing displacement of the overlapping portion 1a and rolling at the time of heat fusion. A main body 52 to which a compacting roller 51 is attached;
A hot-air blowing nozzle 2 is provided such that the tip nozzle opening is inserted between the waterproof sheet 1 and the waterproof sheet 1 'of the overlapping portion 1a. Then, the main body 52
On the surface on the opposite side of the hot air blowing nozzle 2 mounting surface,
6 (viewed from arrow A in FIG. 5) and FIG. 7 (viewed from arrow B in FIG. 6)
As shown in FIG.
Is attached.

The band-shaped auxiliary member 60 includes an annular band-shaped body 61.
Are rotatably supported by a plurality of rollers (five in the figure) 62, and a compression coil spring 64 that presses and urges the roller 62 downward is attached to a mounting shaft 63 of each roller 62.
Is attached. Therefore, the portion of the annular band 61 that overlaps the waterproof sheet 1 ′ always presses and urges the waterproof sheet 1 ′ downward.

According to the self-propelled hot-air fusing machine 50, when hot air is blown out from the nozzle tip opening 2a to perform heat fusing,
At the same time as applying a load to the overlapping portion 1 a by the rolling roller 51, the overlapping portion 1 a is
Since a load can be applied to the adjacent area shifted from the a to the upper waterproof sheet 1 ', the heat fusion can be performed in a state where the hot air is sufficiently blocked without diffusing to the waterproof sheet 1' side. it can. Therefore, similarly to the case where the straight band-shaped auxiliary tool 10 (see FIG. 2) is used, no wrinkles are generated in the surroundings, and the finished state is good.

The band-shaped auxiliary member 60 is not limited to the literal "band-shaped", but may have another shape, for example, a string-shaped shape. The material forming the annular band-shaped body 61 may be the same as or different from that of the straight band-shaped auxiliary tool 10, but is rotated in a state of being urged against the waterproof sheet 1 '. Those having a certain flexibility and strength are preferred. Therefore, the most suitable materials include butyl rubber, ethylene-propylene rubber, ethylene-propylene-diene rubber and the like.

The pressing load of the compression coil spring 64 for pressing the annular band 61 against the waterproof sheet 1 'depends on the number of rollers 62, the material and thickness of the waterproof sheets 1 and 1', and the like. But, in general,
It is preferable to set it to 40 to 100 N / m ² . The width of the region to be pressed and urged (the width of the annular band 61 and the roller 62) depends on the strength of the pressing load, but is usually preferably set to 5 to 15 mm. In addition, as described above, in the case where the shape of the annular band-shaped body 61 is a string shape, it is necessary to secure a diameter of at least 5 mm in order to block the blowing of hot air.

Furthermore, the conditions for heat fusion by the self-propelled hot air fusion machine 50 are not particularly limited.

It is not always necessary to attach the belt-shaped auxiliary tool 60 to the self-propelled hot-air fusing machine 50 as in the above example. For example, a caterpillar-shaped band-shaped auxiliary tool 6
It may be configured such that only 0 can be run manually or automatically, and heat fusion is performed while running in parallel with a normal self-propelled hot air fusion machine. It is also possible to use a device in which the rolling roller 51 and the caterpillar-shaped band-shaped auxiliary tool 60 are combined, and carry out heat fusion with a hand-type hot-air fusion machine while manually moving this.

By the way, in the above series of examples, all the overlapping portions 1a of the ends of the waterproof sheets 1 and 1 'are joined by heat fusion. In the present invention, the portions to be heat fused are:
It is not always necessary to cover the entire overlapping portion of the waterproof sheets 1 and 1 '. For example, as shown in FIG.
Are fixed at regular intervals by a normal disc steel plate 40 and an anchor 41, and the ends of the upper waterproof sheet 1 'are overlapped so as to cover this fixed portion. The same idea as in the above series of examples can be applied to the case where the band-like portion (shown by oblique lines in the drawing) 1b along the edge of the upper waterproof sheet 1 is heat-sealed. That is, in this case, heat is concentrated only on the strip-shaped portion 1b indicated by the diagonal lines, and the heat is prevented from diffusing to other portions. By blowing hot air between them and fusing them together, the same effect as in the above example can be obtained.

Hot air for heat fusion is applied to the belt-like portion 1b.
As a method of concentrating on only the above, it is preferable to use the self-propelled hot-air fusing machine 50 to which the band-shaped auxiliary tool 10 or the special band-shaped auxiliary tool 60 is attached, as described above.

For example, when the band-shaped auxiliary tool 10 is used, as shown in FIG. 9, an insulating sheet 12 is laid on a base 11, then a first waterproof sheet 1 is laid, and the end of the first waterproof sheet 1 is disc-shaped. 40 and anchor 41.
Then, the end of the second waterproof sheet 1 'is overlapped with this end to form an overlapping portion 1a. Then, the overlapping portion 1
8A, at least a band-shaped portion 1b for performing heat fusion (FIG. 8)
Band-shaped auxiliary tool 10 so as to completely cover
In this state, as shown in the drawing, a rolling pressure is applied from above the belt-shaped auxiliary tool 10 while blowing and supplying hot air from the nozzle opening 2a of the hot air blowing nozzle 2 of the hot air fusing machine. By performing this operation while gradually moving along the longitudinal direction, the entire belt-like portion 1b can be thermally fused and joined. According to this method, similar to the above-described case where the entire overlapping portion 1a is joined,
Wrinkles (see FIG. 17) as in the related art are not generated at all, and a good finish is obtained.

When the self-propelled hot-air fusing machine 50 is used, as shown in FIG. 10, when hot air is blown out from the nozzle tip opening 2a to perform hot-sealing, the roller portion 51b is applied to the belt-like portion 1b. At the same time as applying load, hot air fusion machine 5
A load is applied to an adjacent region shifted from the band-shaped portion 1b toward the upper waterproof sheet 1 'by the band-shaped auxiliary tool 60 attached to the zero. Thereby, it is possible to perform the heat fusion in a state where the hot air is sufficiently blocked without diffusing to the waterproof sheet 1 ′ side, and the case where the above-mentioned straight band-shaped auxiliary tool 10 is used (see FIG. 9). Similarly, there are no wrinkles around,
Good finish.

In these examples, the fixing means for fixing the lower waterproof sheet 1 is not limited to the disk steel plate 40 but may be a plate steel plate. Also,
The TPO-coated metal fitting having the surface of the disk steel plate 40 or the plate steel coated with TPO is fixed to the lower side of the waterproof sheet 1 in advance, and the waterproof sheet 1 is placed thereon.
, The TPO-covered metal fitting and the waterproof sheet 1 are fused and fixed by applying an electromagnetic induction heating tool from above the waterproof sheet 1, and then a strip-shaped portion or a fusion fixed part which has passed over the fused fixed part. The method can be applied to a method in which the end portion of the upper waterproof sheet 1 'is overlapped with the band-shaped portion on the front side of the above and is fusion-bonded.

Next, examples will be described together with comparative examples.

[0047]

EXAMPLE 1 A rubber composition having the following composition was vulcanized and formed by a known method to prepare a 1.2 mm thick rubber sheet, which was cut into a 150 mm wide strip and laminated in four layers. By integrating with an adhesive, a band-shaped auxiliary tool 10 having a thickness of 4.8 mm was produced. JIS K630 of this thing
The hardness according to the spring type hardness test A of No. 1 was 59. The specific gravity was 1.15.

[Rubber composition of band-shaped auxiliary tool 10] Ethylene-propylene-diene rubber 60 parts by weight butyl rubber 40 {ZnO 5} carbon black 50 {inorganic filler (clay light carbon) 50} vulcanizing agent 20 {naphthenic oil 20} Vulcanization accelerator 3-5 〃 Sulfur 1-2 〃

Then, using the obtained band-shaped auxiliary tool 10,
According to the method shown in FIG.
1 ′ were joined together. In addition, waterproof sheet 1,
As 1 ′, a TPO sheet having a thickness of 1.2 mm was used, and the width of the joined portion (the width of the overlapping portion between the end portions) was set to 40 mm. In addition, the heat fusion is performed using the variant automatic hot air welding machine No.
No. 4 (self-propelled type, manufactured by Leister Co., Ltd., the width of the nozzle outlet is 40 mm), and the thermal fusion conditions were as follows: hot air blowing temperature: 600 ° C .; fusion speed: 4.0 m / min.

The thus obtained waterproof sheet 1,
The joint 1 'had no wrinkles around it and had a good finish.

[0051]

COMPARATIVE EXAMPLE For the sake of comparison, the waterproof sheet 1 and the belt-like auxiliary tool 10 were not used, and the other conditions were the same as in the above embodiment.
1 ′ were joined together. This joint had many wrinkles toward its periphery, resulting in an unattractive finish.

In order to examine how the internal temperature of the joint obtained by the above Example 1 and the joint obtained by the comparative example are increased during heat fusion, the following was performed. Such an experiment was performed. That is, first,
As shown in FIG. 11, X, A,
Six points of B, C, D, and E were determined as temperature measurement points, and thermocouples were attached to the respective points, and a time-dependent temperature change immediately after thermal fusion by blowing hot air was examined. The description of each measurement point is shown below (the reference numerals are omitted in FIG. 11).

X: between the sheets at a position 20 mm away from the upper sheet end surface A: between the sheet and the band-shaped auxiliary tool at a position 20 mm away from the upper sheet end surface B: 80 mm away from the upper sheet end surface And between the sheet and the band-shaped auxiliary tool C: between the sheet and the band-shaped auxiliary tool at a position 160 mm away from the upper sheet end face D: between the sheet back surface and the base at a position 80 mm away from the upper sheet end face E: upper sheet Between the back surface of the sheet and the base at a position 160 mm away from the end face * However, in the comparative example, the portion "between the sheet and the band-shaped auxiliary tool" is read as "the sheet surface".

Based on the obtained data, A
FIG. 12 shows the time-dependent changes in temperature at the points B, C, and C, and FIG. 13 shows the results of the comparative example. FIG. 14 shows the time-dependent changes in temperature at points X, D, and E of the example product.
And that of the comparative example is shown in FIG.

From these figures, it can be seen that at the measurement point A, there is almost no difference between the product of the example and the product of the comparative example immediately after the thermal fusion, but the temperature of the product of the comparative example greatly decreases over time, and Are diffused and the thermal efficiency is poor. Conversely, in the example product, the measurement points A and X consistently maintain a higher temperature than the other measurement points.
It can be seen that the temperature is suppressed to 0 ° C. or less. In the comparative example, the temperature of the measurement points A and X and the temperature of the other measurement points approached with time, and the temperature at the other measurement point was 40 ° C.
It can be seen that the state where the temperature greatly exceeds ℃ has been continued for a long time.

From these results, the band-shaped auxiliary tool 10 efficiently cuts off the temperature of only the portion to be heat-sealed by blocking the blown hot air from entering the outside of the portion to be heat-sealed and dispersing the heat. It can be seen that the function is performed. Then, since the surrounding temperature does not greatly rise above 40 ° C., it is considered that no displacement occurs due to thermal expansion of the waterproof sheets 1 and 1 ′ in the peripheral portion, and no wrinkles occur.

It should be noted that the waterproof sheet 1,
The following test was conducted in order to confirm whether changes such as wrinkles and sagging appeared in 1 '. First, as shown in FIG. 16, a strip-shaped waterproof sheet 1 cut into a length of 360 mm and a width of 30 mm is prepared, and in a state where the waterproof sheet 1 is tightened, portions of both ends 30 mm are thermally fused to the TPO coating plate 20. To make a test body. Then, the test body was heated in a constant temperature chamber, and at every predetermined temperature, the waterproof sheet 1 was visually inspected for any abnormality such as wrinkles and sagging. The results are shown in Table 1 below.

[0058]

[Table 1]

From the above results, the waterproof sheet 1 was heated at 40 ° C.
It can be seen that sagging occurs when the ratio exceeds. Therefore, it can be seen that in the above-described embodiment, it was supported that the band-shaped auxiliary tool 10 was considered to prevent the occurrence of wrinkles because the surrounding temperature rise was suppressed to approximately 40 ° C. or less.

[0060]

Example 2 A rubber composition having the following composition was vulcanized and molded by a known method to produce an annular strip 61 having a thickness of 7.0 mm, a width of 20 mm and a length of 360 mm. And FIG.
7 was attached to a self-propelled hot air fusion machine 50 shown in FIG. It should be noted that 5 is used to press and urge the annular band 61.
The total load of pressing the sheet by the compression coil spring 64 was 400 N / m ² .

[Rubber composition of the band-shaped auxiliary tool 10] Ethylene-propylene-diene rubber 60 parts by weight butyl rubber 40 {ZnO 5} carbon black 50 {inorganic filler (clay light carbon) 50} vulcanizing agent 20 {naphthenic oil 20} Vulcanization accelerator 3-5 〃 Sulfur 1-2 〃

Then, when the waterproof sheets 1 and 1 'were joined under the same heat fusion conditions as in Example 1, no wrinkles were generated around the waterproof sheets, and a good finish was obtained.

[0063]

As described above, according to the sheet waterproofing method of the present invention, when joining the ends of the waterproof sheet by heat fusion, a special band-shaped auxiliary tool is used to concentrate only on the portion to be thermally fused. To prevent heat from diffusing to other parts. Therefore, according to this method, the periphery of the joint is not affected by thermal expansion during the thermal fusion, and a good finished surface without wrinkles can be obtained.

Then, JIS K6 is used as a band-shaped auxiliary tool.
Spring type hardness test of Type 301: hardness of 50-
75, a specific gravity of 0.9 to 1.4 can provide excellent effects.

As another band-shaped auxiliary tool, an annular band, pressing means for constantly pressing a predetermined length portion of the outer peripheral surface of the band downward, and pressing the band,
The same excellent effect can be obtained by using a device provided with a holding means for holding the urging force by the pressing means so as to be able to travel straight ahead while maintaining the urging force.

Further, the annular band, pressing means for constantly pressing a predetermined length portion of the outer peripheral surface of the band downward, and pressing the belt by pressing the band by the pressing means. By using a self-propelled hot-air fusing machine to which a belt-shaped auxiliary tool provided with a holding means for rotatably holding, the above-mentioned excellent effects can be obtained more easily.

[Brief description of the drawings]

FIG. 1 (a) is an explanatory view of a sheet waterproofing method of the present invention,
(B) is an explanatory view of a conventional sheet waterproofing method.

FIG. 2 is an explanatory diagram of one embodiment of the present invention.

FIG. 3 is an explanatory view of a band-shaped auxiliary tool used in the embodiment.

FIG. 4 is an explanatory diagram of a construction procedure in the embodiment.

FIG. 5 is an explanatory view of a self-propelled hot-air fusing machine used in another embodiment of the present invention.

6 is a view as viewed in the direction of the arrow A in FIG. 5;

FIG. 7 is a view as viewed in the direction of the arrow B in FIG. 6;

FIG. 8 is an explanatory view of another sheet waterproofing method to which the present invention can be applied.

FIG. 9 is an explanatory view of an embodiment in the other sheet waterproofing method.

FIG. 10 is an explanatory view of another embodiment of the other sheet waterproofing method.

FIG. 11 is an explanatory diagram of a temperature change test in the embodiment.

FIG. 12 is a diagram showing a time-dependent temperature change in a predetermined portion of an example product.

FIG. 13 is a diagram showing temperature change over time in a predetermined portion of a comparative example product.

FIG. 14 is a diagram showing a temperature change over time in a predetermined portion of an example product.

FIG. 15 is a diagram showing a time-dependent temperature change in a predetermined portion of a comparative example product.

FIG. 16 is an explanatory diagram of a test method for examining a state change of the waterproof sheet due to heat.

FIG. 17 is an explanatory view of a conventional sheet waterproofing method.

[Explanation of symbols]

 1, 1 'tarpaulin 1a overlapping part 10 belt-shaped auxiliary tool

Claims (10)

[Claims] In a waterproofing method for laying and installing a waterproof sheet directly on an underground or via an insulating sheet, when the ends of the waterproof sheet are overlapped with each other and the overlap portion is joined by heat fusion, the overlap portion is formed. Only by applying heat to the area and blocking the diffusion of heat to other parts, while blowing hot air between the waterproof sheets in the overlapping area to fuse them. Characteristic sheet waterproofing method. 2. A waterproofing method in which a waterproof sheet is laid directly on a lower ground or via an insulating sheet. In this method, the ends of the waterproof sheet are overlapped with each other, and a predetermined portion along an upper edge of the waterproof sheet among the overlapping portions. When joining the strips of width by heat fusion, heat is concentrated only on the strips and the heat is prevented from diffusing to other parts. A sheet waterproofing method wherein hot air is blown to fuse the two. 3. A waterproofing method in which a waterproofing sheet is laid directly on a lower ground or via an insulating sheet, and the ends of the waterproofing sheet are overlapped with each other, and the entirety of the overlapping portions or the upper one of the overlapping portions is provided. When joining a band portion having a predetermined width along the edge portion by heat fusion, the waterproof sheet of the portion to be thermally fused and the waterproof sheet are sealed in a state where the portion to be thermally fused is covered with a flexible band-shaped auxiliary tool. A sheet waterproofing method wherein hot air is blown in between to fuse the two. 4. The band-like auxiliary tool is arranged so that one edge in the longitudinal direction is aligned with the edge of the waterproof sheet disposed above the portion to be heat-sealed with the waterproof sheet. The sheet waterproofing method according to claim 3, wherein an edge portion is set to be shifted laterally from the portion to be heat-sealed and overlap a portion other than the portion to be heat-sealed of the waterproof sheet disposed on the upper side. . 5. An auxiliary tool used in the sheet waterproofing method according to claim 3 or 4, wherein the auxiliary tool is entirely band-shaped and conforms to JIS.
K6301 spring hardness test type A hardness is 5
A band-shaped auxiliary tool having a specific gravity of 0.9 to 1.4 and a specific gravity of 0.9 to 1.4. 6. The band-shaped auxiliary tool according to claim 5, wherein the whole is obtained by vulcanizing and molding a rubber composition containing butyl rubber and ethylene-propylene-diene rubber as main components. 7. When the width of the portion to be heat-sealed between the ends of the waterproof sheet is 1, the width of the band-shaped auxiliary tool is 1.5 to 1.5.
The band-shaped auxiliary tool according to claim 5, wherein the number is set to 5. 8. A waterproofing method in which a waterproofing sheet is laid directly on a lower ground or via an insulating sheet, and the ends of the waterproofing sheet are overlapped with each other, and the entire overlapping portion or the upper one of the overlapping portions is provided. When joining the band-shaped portion of a predetermined width along the edge by heat fusion, the adjacent area shifted toward the upper waterproof sheet from the heat fusion scheduled part,
A sheet waterproofing method characterized in that hot air is blown between a waterproof sheet and a waterproof sheet at a portion to be heat-sealed while being pressed and urged from above by a band-shaped auxiliary tool to fuse the two. 9. An auxiliary tool for use in the sheet waterproofing method according to claim 8, wherein: an annular band-shaped member; and pressing means for constantly pressing a predetermined length portion of an outer peripheral surface of the band-shaped body downward. Holding means for holding the band-like body so as to be rotatable in the circumferential direction while keeping the pressing force by the pressing means. 10. A self-propelled hot-air fusing machine used in the sheet waterproofing method according to claim 8, wherein a plurality of compaction rolls run while applying a load to a portion to be heat-fused between ends of the waterproof sheet. A main body portion to which a roller is attached, and a hot-air blowing nozzle set so that a root portion is attached to the main body portion and a tip nozzle opening is set to be inserted between the waterproof sheet and the waterproof sheet of the portion to be heat-sealed, The belt-shaped auxiliary tool according to claim 9 is provided on the main body portion, wherein a predetermined length of the outer peripheral surface of the band-shaped body is always moved toward the upper waterproof sheet from a portion to be heat-sealed where the pressure roller runs. A hot-air fusing machine mounted so as to follow the vehicle while being pressed against and biased to an adjacent area deviated from the hot air.