JPH08291602A - Floating preventive method of waterproof sheet in flat roof - Google Patents

Abstract

PURPOSE: To prevent the damage of a waterproof sheet, and to waterproof a flat roof surely by balancing air pressure on the inside and outside of the waterproof sheet or holding air pressure on the inside of the waterproof sheet so as to reach slight negative pressure and obviating the floating of the waterproof sheet when negative pressure is generated on the flat roof by a wind, etc., in the waterproof-sheet stretched flat roof. CONSTITUTION: Pressure balancers 10 are arranged at a plurality of places of a flat roof 1, on which a waterproof sheet 3 is stretched. Each pressure balancer 10 has a cylindrical body 11 and a pressure adjusting piece 12 receiving by a seat 13 for a seal held in the cylindrical body 11 in a freely vertically movable manner and fitted inside the cylindrical body 11. The cylindrical bodies 11 of the pressure balancers 10 are installed onto the wall to be waterproofed 2 of the flat roof 1 so that voids between the wall 2 and the waterproof sheet 3 and the outside air are communicated through the cylindrical bodies 11. Internal air in the voids is passed in the cylindrical bodies 11 while lifting the pressure adjusting pieces 12 from lower sections and flowed out to the outside in a negative pressure section on the flat roof 1.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of preventing a waterproof sheet from rising in a flat roof, particularly a waterproof sheet stretched flat roof.

[0002]

2. Description of the Related Art Conventionally, for example, on a flat roof of a concrete structure, that is, on a rooftop of a building, a waterproof sheet made of synthetic resin is fixed to a wall surface to be waterproof only through a joining piece, and the rest is left. It is stretched by the so-called insulation method, in which most of it is left alone. According to this insulating construction method, waterproofing can be surely performed without being affected by the uneven state of the surface of the concrete wall or the like during waterproofing.

[0003]

However, in such a flat roof on which the waterproof sheet is stretched, the external pressure is lower than the internal pressure of the void inside the waterproof sheet (so-called negative pressure) due to, for example, wind. In the flat roof part where it becomes, the phenomenon that the waterproof sheet floats up due to the internal air having a relatively high pressure inside the waterproof sheet,
In severe cases, when a suction force (negative pressure) greater than the fixing strength of the joining piece acts, the joining and fixing portion of the waterproof sheet may be broken.

Therefore, in order to solve this problem, conventionally, the number of attachments of the waterproof sheet joining pieces has been increased. However, if the number of attachments of the joining pieces increases, the attaching work and the joining work of the waterproof sheets are performed. There was a problem that it was very troublesome and the construction cost increased.

Further, conventionally, in order to prevent the above-mentioned waterproof sheet from floating, it has been proposed to seal the waterproof sheet and the lower skeleton along the periphery of the flat roof in a secret manner (for example, Japanese Patent Publication No. 1-44863). See the bulletin).

According to this conventional method, when a negative pressure is generated on the surface of the waterproof sheet, the waterproof sheet is lifted by the negative pressure. Due to the volume expansion of the space inside the waterproof sheet, the internal space also becomes negative pressure. , It was to fix the waterproof sheet by using the decompression force.

[0007] However, according to such a conventional method, if the airtightness between the waterproof sheet and the lower skeleton is impaired due to, for example, a crack in the concrete wall portion on the lower skeleton side of the flat roof, the There is a problem that even if the negative pressure of the air is applied, the decompressing force is not generated in the inner space portion of the waterproof sheet, and the floating of the waterproof sheet cannot be prevented.

The object of the present invention is to solve the above-mentioned problems of the prior art, and in a waterproof sheet stretched flat roof, when negative pressure is generated on the flat roof due to wind or the like, the air pressure inside and outside the waterproof sheet is balanced or The air pressure inside the tarpaulin can be maintained so that it is slightly negative, and the tarpaulin can be prevented from rising and damage to the tarpaulin can be prevented. It is an object of the present invention to provide a waterproof sheet floating prevention method for a flat roof, which enables quick and reliable waterproofing of the flat roof.

[0009]

SUMMARY OF THE INVENTION In order to achieve the above object, the invention according to claim 1 is such that a waterproof sheet is joined to a surface of a wall to be waterproofed only at a required portion such as a peripheral portion. Pressure equalizers are arranged at a plurality of points on the flat roof that is joined to one piece and the rest of it is stretched, and each pressure equalizer is held in a tubular body and inside the tubular body so that it can be lifted and lowered. A pressure adjuster that can be received by a sealing seat provided inside, and a cylindrical main body of the pressure balancing device is provided on a wall of a flat roof to be waterproofed, and a gap between the wall and the waterproof sheet and outside air are provided. It is installed so that it communicates via the tubular body, and on the flat roof where the outside air pressure is higher than the inside pressure of the void inside the waterproof sheet, the pressure regulator inside the tubular body of the pressure balancing device is exposed to the outside air. It is pressed from above and abuts on the sealing seat. In the part where the external pressure is lower than the internal pressure of the void inside the waterproof sheet, the internal air in the void passes through the tubular body while lifting the pressure regulator from below and flows out to the outside. The feature of this method is to prevent the waterproof sheet from rising on the flat roof.

Next, the invention according to claim 2 is the invention of the method for preventing floating of a waterproof sheet in a flat roof according to claim 1, wherein an air passage speed increasing mechanism is attached to an upper end portion of each pressure balancing device, The air passage speed increasing mechanism is composed of an upper umbrella-shaped body having a substantially elliptical vertical cross section, a lower annular body, and a rod-shaped connecting member connecting the both at a predetermined interval. Between the upper umbrella-shaped body and the lower annular body, an air circulation portion that is wide in the peripheral portion and narrowed in the center portion is formed, and the flow of air passing through this air circulation portion is narrow. It is characterized in that the flow velocity is increased in the central portion where

[0011]

According to the invention of the method for preventing the waterproof sheet from rising in the flat roof according to the above-mentioned claim 1, the pressure balancing devices are arranged at a plurality of locations on the wall of the flat roof to be waterproofed, and the cylindrical main body of the pressure balancing device is mounted on the flat roof. Is attached to the wall to be waterproofed so that the air gap between the wall and the waterproof sheet and the outside air communicate with each other through the tubular main body. In the positive pressure portion higher than the internal pressure of the air gap, the pressure regulator inside the cylindrical body of the pressure balancing device is pressed from the outside by the outside air and is brought into contact with the sealing seat to be sealed. In the negative pressure part where the external pressure is lower than the internal pressure of the void inside the waterproof sheet,
Since the internal air in the void passes through the inside of the tubular body while lifting the pressure regulator from below and flows out to the outside, at the negative pressure portion on the flat roof, the internal air having a relatively high pressure inside the waterproof sheet is removed. , It can be released to the outside through a pressure balance device, so that the air pressure inside and outside the tarpaulin can be held in equilibrium, or the air pressure inside the tarpaulin can be maintained at a slight negative pressure, and the tarpaulin rises. Therefore, the waterproof sheet can be prevented from being damaged and the waterproof sheet can be prevented from being broken.

In addition, the wall to be waterproofed of the flat roof is usually
The joining pieces are arranged and fixed at a rate of about 3 pieces / m ² , but as described above, the internal air having a relatively high pressure inside the waterproof sheet is removed by the pressure balancing device by the action of the pressure balancing device. It can be released to the outside through the air, and the air pressure inside and outside the waterproof sheet can be held in equilibrium, or the air pressure inside the waterproof sheet can be held to be a slight negative pressure, so the number of connecting pieces to be attached can be small, Since the time and effort for waterproofing can be reduced, it is possible to shorten the overall work time for waterproofing the flat roof and to reliably carry out the waterproofing of the flat roof.

Further, according to the invention of the method for preventing the floating of the waterproof sheet in the flat roof according to the second aspect, the umbrella-shaped body and the lower portion of the upper portion of the air passage speed increasing mechanism attached to the upper end portion of each pressure balancing device are provided. Between the annular body, an air circulating portion that is wide in the peripheral portion and narrow in the central portion is formed, and the flow of air passing through this air circulating portion is
Since the flow velocity is accelerated in the narrowed central portion, for example, in the negative pressure portion, the internal air having a relatively high pressure inside the gap inside the waterproof sheet moves inside the pressure balancing device. When it leaks to the outside,
Since the flow velocity is increased in the narrow air circulation portion at the center of the air passage speed increasing mechanism, and the outflow of the internal air is promoted by this, the waterproof sheet can be prevented from rising quickly.

[0014]

Embodiments of the present invention will now be described with reference to the drawings.

1 to 4 show a first embodiment of the present invention.

First, in FIG. 1, a curing sheet (5) is first laid over the entire surface of the concrete top wall (2) of the flat roof (1) to be waterproofed. Connect the required parts to the connecting piece (4) and the fixture (6).
Secure to the wall (2) to be waterproofed by.

Then, the waterproof sheet (3) is stretched by joining only the peripheral portion and a required intermediate portion to the joining piece (4) and leaving the rest of the portion as it is. The waterproof sheet (3)
Will also be laid on the surface of the concrete wall of the parapet (1a) of the flat roof (1).

In the present invention, as shown in FIG. 2, pressure balancing devices (10) are provided at eight locations on the top wall (2) of the flat roof (1).
To place.

As shown in FIGS. 3 and 4, the pressure balance device (1
To attach (0), attach the balancer mounting plate (20) from the top of the curing sheet (5) to the fixture (6) at the required location on the top surface of the top wall (2).
Fixed by.

Here, the waterproof sheet (3) is made of a soft polyvinyl chloride sheet and has a width of, for example, about 1 to 2 m.
Is long and its thickness is usually about 1.0 to 2.5 mm
Is. In addition, the side edge portions of the adjacent waterproof sheets (3) and (3) are bonded to each other over the entire length with an adhesive in a state of being superposed on each other.

On the other hand, the curing sheet (5) is composed of a composite sheet of polyethylene foam and the same resin film, and is a long sheet having a width of about 1 to 2 m. Then, the side edge portions of the curing sheets (5) and (5) adjacent to each other are partially joined together by an adhesive or heat fusion in the superposed state. Therefore, the layer of the curing sheet (5) is not airtight, and the gap (8) between the wall (2) to be waterproofed of the flat roof (1) and the curing sheet (5) and the curing sheet (5) ) And the space (7) between the waterproof sheet (3) communicate with each other.

The presence of the curing sheet (5) can prevent the waterproof sheet (3) from being damaged by the concrete top wall (2) and the fixture (6), resulting in water leakage. The fear can be eliminated.

As the joining piece (4) for joining the waterproof sheet (3) and the balancer mounting plate (20), a vinyl chloride steel plate consisting of steel plates coated on both sides with vinyl chloride resin is used and fixed. An open-nail nail was used as the tool (6).

In the middle portion of the top wall (2) of the flat roof (1), for example, a circular joining piece (not shown) and a flat strip-like joining piece (not shown) are used, and the top wall (2) is A strip-shaped joining piece (4) having a substantially L-shaped cross section and a substantially inverted L-shaped cross section was used at the corners and the outer peripheral edge of the parapet part (1a). The equilibrium device mounting plate (20) had a substantially rectangular shape when seen from a plane and had nail holes at its four corners.

As an adhesive agent for joining the waterproof sheet (3) to the joining piece (4) or the balancer mounting plate (20), a tetrahydrofuran solvent type adhesive agent is used, and a joining layer excellent in durability is obtained. It was

As shown in detail in FIG. 4, the pressure balance device (1
0) is the same as the cylindrical main body (11) made of synthetic resin, which is received inside the cylindrical main body (11) and is supported by the sealing receiving seat (13) provided inside the cylindrical main body (11). And a pressure regulator (12) made of synthetic resin.

In this embodiment, the tubular main body (11) has an upper half (1
1a) and the lower half (11b) are divided into a male screw part (24) of small diameter provided at the lower end of the former and a female screw part (25) provided at the upper end of the latter. These are connected to each other, and the tip of the upper half body (11a) is received by the step portion (26) provided inside the upper end portion of the lower half body (11b).

The seal receiving seat (13) for receiving the pressure regulator (12) is provided on the inner peripheral surface of the lower half body (11b) of the cylindrical main body (11), and A concave groove having a substantially semicircular cross section is provided at the tip portion, and an O-ring (14) is fitted in the concave groove. An annular inwardly projecting portion (15) is provided inside the upper half body (11a) of the tubular body (11).

The pressure regulator (12) is disc-shaped, and a shaft portion (17) extending up and down both sides is provided in the central portion thereof. The upper shaft (17) consists of an upper small diameter shaft (17a) and a lower large diameter shaft (17a).
b) and the lower shank (17) is
c).

Bearing members (18) and (19) are provided on the upper end and the lower end of the cylindrical main body (11), respectively. Upper bearing member (1
8) is substantially cross-shaped when viewed from above, and a sliding bush (28) with a flange is attached to the center of the cross-shaped side part of the upper half of the tubular body (11). An upper horizontal portion (18a) fitted into a groove (29) provided on the upper surface of 11a), and a vertical portion (18b) extending downward from the inner end of the upper horizontal portion (11a) along the inner surface of the upper half body (11a), The lower horizontal part (1
8c) and. On the other hand, the lower bearing member
(19) is substantially cross-shaped when viewed from above, and a sliding bush (28) with a flange is attached to the center of the cross-shaped side part of the lower half of the tubular body (11) ( 11b) It is attached to the inner circumference of the bottom end.

The small diameter shafts (17a) (17c) on both the upper and lower sides of the pressure regulator (12) are respectively bushes for both upper and lower slides.
(28) When it is inserted into (28) and the pressure regulator (12) is raised and lowered,
These small diameter shafts (17a) (17c) are guided by the bushes (28) (28) so that the disc-shaped pressure regulator (12) can move up and down while maintaining a horizontal state. In addition, pressure regulator
The upper end of the upward movement of (12) is the large diameter shaft part (17) of the upper shaft part (17).
b) The position where the step (17d) at the upper end abuts on the bush (28).

By the way, at the required location of the top wall (2) of the flat roof (1), the equilibrium device mounting plate (20) fixed with the fixture (6) from above the curing sheet (5) has a ventilation hole ( 21) has been opened. And a waterproof sheet is provided on the upper surface of the mounting plate (20).
Joining the corresponding part (3a) of (3), the waterproof sheet
A ventilation hole (23) communicating with the ventilation hole (21) of the mounting plate (20) is formed in the corresponding portion (3a) of (3). Therefore, the balancer mounting plate (2
0) also serves as a joining piece for partially fixing the waterproof sheet (3) in the middle portion of the top wall (2).

At the peripheral portion of the ventilation hole (23) of the waterproof sheet portion (3a) joined to the upper surface of the balancer mounting plate (20), the lower surface of the tubular main body (11) of the pressure balancer (10). Are bonded to each other via a solvent-type adhesive in which a small amount of vinyl chloride resin is dissolved in tetrahydrofuran. This ensures that the void inside the tarpaulin (3)
The internal air of (7), in other words, the gap (7) between the waterproof sheet (3) and the curing sheet (5) is the ventilation hole (23) of the waterproof sheet portion (3a) and the balancer mounting plate. It communicates with the space (16) in the cylindrical body (11) through the ventilation hole (21) of (20), and further communicates with the outside air from the upper end of the cylindrical body (11). In addition, in order to improve the sealing property of the mounting portion of the pressure balance device (10), an annular shape is formed so as to straddle the outer peripheral surface of the lower end portion of the tubular body (11) and the upper surface of the waterproof sheet portion (3a). The waterproof sheet fragment (22) was applied and bonded through a similar tetrahydrofuran solvent-based adhesive. Further, between the outer peripheral edge portion of the annular waterproof sheet fragment (22) and the waterproof sheet portion (3a), tetrahydrofuran is used, and more vinyl chloride resin, which is the material of the waterproof sheet (3), is used than in the case of the above adhesive. The sealing material (36) dissolved in the eyes was applied.

As described above, since the layer of the curing sheet (5) does not have airtightness, the void (8) between the top wall (2) of the flat roof (1) and the curing sheet (5). And curing sheet (5)
And the space (7) between the waterproof sheets (3) communicates with each other.

Further, in this embodiment, FIGS.
As shown in, an air passage speed increasing mechanism (30) is provided at the upper end of each pressure balancing device (10). Here, the air passage speed increasing mechanism (30) is made of stainless steel and has an upper elliptical body (31) having a substantially elliptical longitudinal section, and a lower annular body (32) also made of stainless steel. A female threaded portion (34) provided on the inner surface of the lower annular body (32), which is constituted by a stainless steel rod-shaped coupling member (33) that is coupled at a predetermined interval.
By being screwed to the male screw portion (27) provided on the outer periphery of the upper end of the cylindrical main body (11) of the pressure balancer (10),
An air passage velocity increasing mechanism (30) is attached to the upper end of the pressure balancing device (10).

Umbrella at the top of the air passage speed increasing mechanism (30)
Between the (31) and the lower annular body (32), an air circulation portion (35) that is wide in the peripheral portion and narrow in the central portion is formed, and therefore, this air circulation portion (35) is formed. The flow rate of the air passing therethrough is increased at the narrowed central portion.

In the above, for example, as shown in FIG.
Cross wind from outside the parapet (1a) against the flat roof (1)
When (A) blows, a so-called negative pressure is generated above the top wall (2) inside the parapet part (1a), and the external pressure is applied to the waterproof sheet.
(3) It becomes lower than the internal pressure of the inner void (7). The positive pressure is above the top wall (2) of the other part, and the external atmospheric pressure is higher than the internal pressure of the void (7) inside the waterproof sheet (3).

At the negative pressure portion, as shown on the left side of FIG. 3, since the outside air pressure is low, the internal air having a relatively high pressure in the void (7) is used for ventilation of the waterproof sheet portion (3a). Hole
(23) and the ventilation hole (21) of the balancer mounting plate (20), while passing through the space (16) in the tubular body (11) while lifting the pressure regulator (12) from below, Spill to. In other words,
The internal air having a relatively high pressure in the void (7) is sucked by the negative pressure, and the tubular main body (11) of the pressure balancing device (10).
It leaks to the outside through. As a result, the air pressure inside the air gap (7) inside the tarpaulin (3) is lowered, and eventually the tarpaulin
(3) The air pressure inside and outside is balanced or the waterproof sheet (3)
The inside air pressure is maintained so as to be a slight negative pressure to prevent the waterproof sheet (3) from rising.

In this embodiment, the pressure balance device (10)
Since the air passage speed increasing mechanism (30) is attached to the upper end of the, the internal air having a relatively high pressure inside the air gap (7) inside the waterproof sheet (3) in the negative pressure portion,
When flowing out through the tubular main body (11) of the pressure balancing device (10), its flow velocity can be increased in the narrow air circulation portion (35) at the center of the air passage velocity increasing mechanism (30), which allows Since the outflow of the internal air is promoted, it is possible to quickly prevent the waterproof sheet (3) from rising.

On the other hand, in the positive pressure portion above the flat roof (1), as shown on the right side of FIG. 3 and FIG.
(3) Since it is higher than the internal pressure of the inner space (7), the waterproof sheet (3) does not rise, but the pressure balance device (10) has a cylindrical body (11) inside. The pressure regulator (12) is pressed by the outside air from above and brought into contact with the O-ring (14) of the sealing seat (13), and the pressure balancer (10) itself is sealed.

Experimental Example Next, in order to confirm the effect of the present invention, in the flat roof (1) having the above-mentioned sheet waterproof structure and having an area of, for example, 15 m × 25 m, from the inner surface of the parapet part (1a). On the upper surface of the concrete top wall (2) 500 mm apart, a total of eight pressure balancers (10) were installed at intervals of 7 m.

Here, the cylindrical main body (1) of each pressure balancing device (10) is
The outer diameter of 1) is 100 mm, and the air passage speed increasing mechanism (30)
The outer diameter of the upper umbrella-shaped body (31) was 200 mm.

For a flat roof (1) with a waterproof sheet equipped with such a pressure balancing device (10), strong winds actually blown and the wind speed of 30 m / sec was measured, but the floating phenomenon of the waterproof sheet (3) occurred. Was not observed at all.

Further, since the joining pieces (4) are normally arranged and fixed at a rate of 3 pieces / m ² in the middle portion of the top wall (2) of the flat roof (1), the above-mentioned area of 15 m × 25 m Having a flat roof
In (1), usually about 500 joint pieces (4) are arranged and fixed, but according to the method of the present invention, by the action of the eight pressure balancing devices (10) as described above. , Tarpaulin
Since it is possible to prevent (3) from rising,
The number of installations of (4) was about 300, and the workability of the installation of the waterproof sheet (3) on the flat roof (1) was greatly improved, and the overall work time for waterproofing was shortened.

In the above embodiment, the top wall of the flat roof (1) is
Although the pressure equalizers (10) are arranged at 8 points in (2), the number of pressure equalizers (10) may be plural, which is the top wall (2) of the flat roof (1) to be waterproofed. ) Of the waterproof sheet (3), that is, the number that can prevent the floating phenomenon of the waterproof sheet (3) from occurring.

FIG. 5 shows a second embodiment of the present invention. Here, the difference from the case of the first embodiment is that
The point is that the cylindrical body (11) of the pressure balancer (10) is made by integral molding.

That is, in the second embodiment, the first
Inner bulge (15) of the upper half of the tubular body (11) in the example
Is omitted, and the tubular main body (11) is made by integral molding. Therefore, the tubular body (11) is
It is also possible to omit the screwing of the male screw part (24) and the female screw part (25) without separating the 1a) and the lower half body (11b).

Since the other points of the second embodiment are the same as those of the first embodiment, the same parts are designated by the same reference numerals in the drawings.

As described above, the structure of the pressure balancing device (10) used in the method of the present invention is not limited to that shown in the figure. In short, the pressure balancing device (10) includes the tubular body (11) and the cylindrical body (11). A pressure regulator that is held in the inside of the cylinder so that it can move up and down and that is received by a sealing seat (13) provided inside the tubular body (11)
(12) and, on the flat roof (1), where the outside pressure is higher than the inside pressure of the air gap (7) inside the tarpaulin (3), the cylindrical shape of the pressure balancer (10) Pressure regulator (1
2) is pressed from above by the outside air and is brought into contact with the sealing seat (13) to be sealed, and conversely the outside air pressure is a waterproof sheet.
(3) In the negative pressure part lower than the internal pressure of the inner void (7),
The internal air in the air gap (7) flows through the cylindrical body (11) inside the pressure regulator (1
Anything can be used as long as it is designed to pass through 2) while being lifted from below and flow out.

In the above embodiments, the soft polyvinyl chloride sheet is used as the waterproof sheet (3), but the waterproof sheet (3) may be made of a thermoplastic synthetic resin sheet such as polyethylene or polypropylene, or a non-plastic sheet. A vulcanized rubber-based sheet, a rubber asphalt-based sheet or the like may be used. However, it is preferable to use a sheet made of soft polyvinyl chloride, particularly in terms of adhesion between the sheets.

In the embodiment, a vinyl chloride steel plate composed of steel plates coated on both sides with vinyl chloride resin is used as the joining piece (4) for joining the waterproof sheet and the balancer mounting plate (20). (4) and the balancer mounting plate (20),
In addition, a plate material such as a hard or semi-hard synthetic resin plate, a metal plate, or a steel plate having one surface coated with vinyl chloride resin may be used.

Furthermore, although the open leg nail is used as the fixing tool (6), a curl plug or the like may be used instead.

In the above embodiment, the waterproof sheet (3) is attached to the joining piece.
(4) and the equilibrium device mounting plate (20) are bonded with a solvent-based adhesive in which a small amount of vinyl chloride resin is dissolved in tetrahydrofuran. When both the sheet (3) and the joining surface of the joining piece (4) are made of thermoplastic synthetic resin, they can be joined by heat fusion without using an adhesive.

Further, in the embodiment, in order to protect the waterproof sheet (3), a curing sheet (5) made of a composite sheet of polyethylene foam and the same resin film is interposed, but such a curing sheet ( 5) includes a foamed sheet having a thickness of 1 to 4 mm, which is made of an independent foamed material of thermoplastic resin such as polyethylene, polypropylene, polyurethane and polyvinyl chloride, or these foamed sheets and, for example, polyethylene, polypropylene, polyvinyl chloride and A composite sheet may be used in which a reinforcing layer made of a polyester film or a woven or non-woven fabric made of these resins is attached to the entire surface with an adhesive or by heating. In particular, it is desirable to use a polyethylene or polypropylene film, or a foam, and further a composite sheet of a foam of these resins and a resin film, a woven cloth or a non-woven cloth.

The curing sheet (5) may be omitted in some cases.

Further, the wall (2) to be waterproof of the flat roof (1) is
It is usually made of concrete, but it may be made of other materials such as precast concrete board, lightweight cellular concrete board and metal roof board.

[0057]

As described above, according to the method of the present invention, in the invention described in claim 1, the waterproof sheet is joined to the surface of the wall to be waterproofed only at the required portion such as the peripheral portion and the remaining portion. Most of the pressure balancing devices are placed in multiple places on the flat roof that is left standing and stretched. Each pressure balancing device is a cylindrical main body and a seal that is held inside the cylindrical main body so that it can move up and down and is installed inside the cylindrical main body. It has a pressure adjuster that can be received in the receiving seat,
The tubular body of the pressure balancing device is attached to a waterproof wall of a flat roof so that the void between the wall and the waterproof sheet and the outside air communicate with each other through the tubular body, and on the flat roof, by wind or the like. , At the portion where the outside air pressure is higher than the inside pressure of the void inside the waterproof sheet, the pressure regulator inside the cylindrical body of the pressure balancing device is pressed from above by the outside air and abuts against the sealing seat to be sealed. On the contrary, in the part where the external pressure is lower than the internal pressure of the void inside the waterproof sheet, the internal air in the void passes through the tubular main body while lifting the pressure regulator from below and flows out to the outside. Therefore, in the negative pressure portion on the flat roof, the internal air having a relatively high pressure inside the tarpaulin can be released to the outside through the pressure balancing device, so that the air pressure inside or outside the tarpaulin is balanced or not. The air pressure inside the tarpaulin can be maintained so as to be a slight negative pressure, so that the tarpaulin can be prevented from rising, and damage to the tarpaulin can be prevented in advance. It is possible to prevent breakage.

Then, by the action of the pressure balancing device,
Internal air having a relatively high pressure inside the waterproof sheet can be released to the outside through a pressure balancing device,
Since the air pressure inside and outside the tarpaulin can be maintained in a balanced manner or the air pressure inside the tarpaulin becomes a slight negative pressure, the number of connecting pieces to be attached is much smaller than in the case of normal waterproof construction. Therefore, since the time and effort for waterproofing can be reduced, it is possible to reduce the total work time for waterproofing the flat roof and to reliably perform the waterproofing of the flat roof.

Further, in particular, according to the invention described in claim 2, between the upper umbrella-shaped body and the lower annular body of the air passage velocity increasing mechanism attached to the upper end of each pressure balancing device,
An air circulation portion that is wide in the peripheral portion and narrowed in the center portion is formed, and the flow rate of the air passing through the air circulation portion is increased in the narrowed central portion. Therefore, for example, in the negative pressure portion, when the internal air having a relatively high pressure in the void inside the waterproof sheet flows out through the inside of the pressure balancing device to the outside, the narrow air in the central portion of the air passage speed increasing mechanism is used. Since the flow velocity is increased in the circulation portion, and the outflow of the internal air is promoted thereby, it is possible to quickly prevent the waterproof sheet from rising.

[Brief description of drawings]

FIG. 1 is a schematic vertical sectional view of a flat roof showing a first embodiment of the present invention, showing a state in which a pressure balance device is installed on the flat roof.

FIG. 2 is a schematic plan view of the flat roof.

FIG. 3 is a partially enlarged cross-sectional view of the flat roof of FIG. 1, showing the action of the pressure balancing device in the negative pressure portion and the positive pressure portion.

FIG. 4 is an enlarged cross-sectional view of a pressure balancing device installed on a waterproof sheet stretched flat roof.

FIG. 5 is an enlarged cross-sectional view of a pressure balancing device installed on a waterproof sheet stretched flat roof according to a second embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Flat roof 2 Wall to be waterproofed (top wall made of concrete) 3 Waterproof sheet 4 Joining piece 7 Void 10 Pressure balancing device 11 Cylindrical body 12 Pressure regulator 13 Sealing seat 30 Air passage speed increasing mechanism 31 Umbrella 32 Ring Body 33 Rod-shaped connection member 35 Air circulation unit

Claims (2)

[Claims] 1. A waterproof sheet is provided on the surface of a wall (2) to be waterproofed.
The pressure balancing devices (10) are placed at multiple points on the flat roof (1) where (3) is joined to the joining piece (4) only at the required portion such as the peripheral edge and most of the rest is left standing. The pressure balancing device (10) includes a tubular body (11) and a pressure regulator (12) which is held in the tubular body (11) so as to be able to move up and down and is received by a sealing seat (13) provided inside the tubular body (11). ) And a pressure balance device (10)
The tubular body (11) of the above is placed on the wall (2) of the flat roof (1) to be waterproof, and the void (7) between the wall (2) and the waterproof sheet (3) and the outside air are tubular body (11). Attached so that they can communicate with each other,
On the flat roof (1), the outside air pressure is the air gap inside the waterproof sheet (3).
At a portion higher than the internal pressure of (7), the pressure regulator (12) in the tubular main body (11) of the pressure balancing device (10) is pressed from above by the outside air and hits the seal seat (13). In the part where the external air pressure is lower than the internal pressure of the air gap (7) inside the waterproof sheet (3), the internal air in the air gap (7) presses the inside of the tubular body (11). A method for preventing the waterproof sheet from floating on a flat roof, which is designed to pass through the regulator (12) while being lifted from below and to flow out. 2. An air passage speed increasing mechanism (30) is attached to an upper end of each pressure balancing device (10), and the air passing speed increasing mechanism (30) has an umbrella-shaped body ( 31), a lower annular body (32), and a rod-shaped connecting member (33) that connects the two at a predetermined interval, and an upper umbrella-shaped body (30) of the air passage speed increasing mechanism (30). An air circulation portion (35) that is wide in the peripheral portion and narrow in the center portion is formed between the lower portion (31) and the lower annular body (32).
The method for preventing the floating of a waterproof sheet on a flat roof according to claim 1, wherein the flow rate of the air passing through (35) is increased in the central portion having a narrow width.