JP3248554B2 - Waterproof membrane construction method for buildings - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waterproofing film forming method for forming a urethane waterproofing film on the roof of a concrete building or on the bottom or side of a pool.

[0002]

2. Description of the Related Art As a method of forming a waterproof film on the roof of a concrete building, a urethane waterproof film is formed on the surface of a construction by impinging and mixing a high-speed curing urethane resin base liquid and the curing agent liquid during spraying. The method of doing so is conventionally known.

[0003]

However, when a urethane waterproofing film is formed on the surface of the work such as concrete or mortar by the conventional method, water vapor evaporating from the inside of the concrete or the like over time is trapped in the back surface of the urethane waterproofing film. As a result, a blistering phenomenon was observed in which the urethane waterproofing membrane was swelled by the pressure. In order to prevent this blistering phenomenon, as shown in FIG. 8, a ventilation spacer 93 such as a glass mesh is provided between a work 91 made of concrete or the like and a urethane waterproof film 92, and the ventilation spacer 93 is A communicating deaerator 90 is provided so that water vapor does not accumulate on the back surface of the urethane waterproof film 92.
However, such a construction method is not only complicated and costly, but also reduces the adhesion strength between the urethane waterproof film 92 and the work 91, and is not used for a waterproof film such as a pool. there were.

Further, in the conventional method, it is difficult to form a urethane waterproofing film having a predetermined thickness by one spraying, and several spraying operations are required, resulting in poor work efficiency.

Further, the conventional method has a problem that the adhesion strength between the urethane waterproofing film and the work is insufficient.

An object of the present invention is to solve the above-mentioned problems of the conventional method.

[0007]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a high-speed curable urethane resin base liquid and a hardener liquid in a static mixing section formed by a screw guide. After the two liquids are mixed by a static mixing section under pressure, the mixed liquid is supplied to an outlet of the static mixing section.
Between the static mixing section and the outer cylinder that covers it
The compressed air flowing through the air path formed above is jetted from the nozzle portion and blown onto the work to form a urethane waterproof film on the surface thereof.

In the present invention, when the two liquids are fed to the static mixing section by adjusting the total supply amount of the two liquids while maintaining the mixing ratio at a predetermined value, the urethane waterproofing membrane becomes high. It is preferable because the urethane waterproofing film can be easily formed to a predetermined thickness while maintaining the quality and increasing the adhesion strength.

Further, in the present invention, if both of the liquids are pressure-fed to the static mixing section by using a gear pump, pulsation at the time of pressure-feeding can be prevented. Since the pumping was performed, pulsation occurred during the pumping.) It is preferable because the urethane waterproofing membrane can be maintained at a high quality.

[0010]

According to the present invention, the fast-curing urethane resin base material liquid and the curing agent solution after thoroughly mixed with <br/> static mixing portion formed in the screw guide, Static
At the outlet of the mixing section, the mixture is ejected by the flow of compressed air from the nozzle, resulting in the formation of a urethane waterproof film on the surface of the workpiece that does not transmit water but transmits water vapor. Was successful.

Although the reason is not always clear, the mixture of the base liquid and the curing agent liquid is sufficiently mixed, and the mixed liquid droplets which are starting to be cured are ejected from the nozzles on the compressed air, whereby the mixed liquid is hardened. The droplets have a relatively large particle size, that is, a particle size of 1.0 to 3.0 μm, and have a homogeneous material (the particle size of a mixed droplet is approximately 0.2 to 0.5 μm in the conventional method). When the mixed droplets were laminated on the surface of the workpiece to form a urethane waterproof film, relatively large and hardly crushed pores were formed. As a result of the increased probability that these pores are continuous, it is presumed that a urethane waterproofing film that does not transmit water but transmits water vapor is formed.

In addition, since the hardening of the mixed droplet is started early, the mixed droplet can be easily laminated on the surface of the workpiece, so that the urethane waterproofing film having a thickness of about 2 to 3 mm is formed. Forming is possible with a single spray.

Further, since the material of the mixed droplet can be made uniform and the energy of the semi-cured mixed droplet at the time of collision with the workpiece is increased, high quality is achieved. Thus, a urethane waterproofing film having high adhesion strength can be formed.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS.

FIG. 1 is a view showing the main components of the high-speed curing urethane resin of the present invention and the route of the curing agent. 1a is a main agent composed of a polyether-based polyol, and 1b is a curing agent composed of an isocyanate prepolymer. 2a is a gear pump for pumping the liquid base material 1a, and 2b is a gear pump for pumping the liquid hardener 1b.
Reference numerals 3a and 3b denote pressure gauges for measuring the pressures of the main agent 1a and the curing agent 1b, respectively, and reference numerals 4a and 4b denote pressure switches for releasing the main agent 1a and the curing agent 1b, respectively. Reference numerals 5a and 5b denote flow meters for detecting the flow rates of the main agent 1a and the curing agent 1b, respectively. Reference numeral 7 denotes a hose for pressure-feeding the main agent 1a and the curing agent 1b, and reference numeral 8 denotes an ejector for ejecting a mixed solution 9 of the main agent 1a and the curing agent 1b. Reference numeral 10 denotes a surface (base) of a work to be provided with a waterproof film, which is already coated with a primer. 11
Reference numerals a and 11b denote motors for driving gear pumps 2a and 2b for pumping the main agent 1a and the curing agent 1b, respectively.

FIG. 2 is a circuit diagram showing a control structure of the apparatus used in the present embodiment. Reference numeral 14 denotes an operation panel for designating an amount of the main agent 1a and the hardener 1b to be pumped per unit time by an operator. . 6a and 6b are magnetic sensors attached to the flow meters 5a and 5b, respectively. A control unit 13 provides motor control information to drivers 12a and 12b, which will be described later, based on information obtained from the magnetic sensors 6a and 6b. Reference numerals 12a and 12b denote drivers for the motors 11a and 11b, which respectively drive the main agent pumping gear pump 2a and the curing agent pumping gear pump 2b.
11b is controlled.

FIG. 3 is a detailed view of the jetting machine 8. 21 is a trigger of the ejector 8, 22 is a pipe for introducing the air supplied from the compressor to the ejector 8, 23 is a valve for controlling the supply of air, and 24 is a trigger 21 for adjusting the opening and closing of the valve 23. An axis 25 is an air path through which air flows when the trigger 21 is pulled. 27 is a nozzle and 28 is a static mixing unit, which is made of resin. Reference numeral 26 denotes an outer cylinder that covers the static mixing section 28, and an air path through which air is guided to the nozzle 27 is provided between the outer cylinder 26 and the static mixing section 28. Reference numeral 7 denotes a hose that guides the main agent 1a and the curing agent 1b to the ejector 8, and is connected to both sides of the ejector 8. Reference numeral 30 denotes a path through which the main agent 1a and the curing agent 1b supplied from the hose 7 flow.

FIG. 4 is an enlarged sectional view of the vicinity of the ejection port of the ejector 8. An air path 33 guides compressed air to the air path 31 of the outer cylinder 26 and is connected to the air path 25.
Reference numeral 31 denotes an air path provided between the outer cylinder 26 and the static mixing section 28, which is constituted by a plurality of grooves as shown in FIG. Reference numeral 29 denotes a spiral screw guide in the static mixing section 28. Reference numeral 38 denotes an outlet of the mixed liquid 9 in the static mixing section 28. Here, the mixed liquid 9 is sucked by the compressed air flowing through the air path 31, guided to the outlet 27a of the nozzle 27, and ejected from the outlet 27a. The air is sprayed to the outside in the form of a mist on the compressed air flow.

FIG. 5 is an exploded view of the vicinity of the ejection port of the ejection device 8. 37a and 37b are inlets for the main agent 1a and the hardener 1b, respectively, from which the main agent 1a and the hardener 1b are sent to the static mixing section 28. Reference numeral 36 denotes a nut for fixing the static mixing section 28 to the jetting machine 35.

FIG. 6 is a diagram showing the gears 41 of the flow meters 5a and 5b and the sensors 6a and 6b. Gear 41 made of resin
A change in the magnetic field caused by the embedded magnet 42 is detected by the sensors 6a and 6b. Although no bearing is provided in the bearing portion of the gear 41, it has sufficient lubricity because of self-lubrication by resin.

FIG. 7 is a view showing a state of packing at bearing portions of the gear pumps 2a and 2b.

Reference numeral 43 denotes a bearing part of the gear pump case,
Is the rotating shaft, 45 is the packing, 46 is the packing holder, 4
7a and 47b are Teflon rings.

A method for applying a waterproofing film using the jetting machine 8 will be described below.

First, the operator inputs the amount of the main agent 1a and the hardener 1b to be pumped per unit time from the operation panel 14. The controller 13 controls a motor driver 12 for controlling the motors 11a and 11b for driving the main agent gear pump 2a and the curing agent gear pump 2b based on the values input by the operator.
a, 12b. Based on this information, the motor drivers 12a and 12b drive the motors 11a and 11b, and pump the main agent 1a and the hardener 1b by the gear pumps 2a and 2b. This pumping amount is measured by the flow meters 5a and 5b, and information on the flow rate is sent to the control unit 13. The control unit 13 adjusts the flow rate by controlling the rotation speed of the motors 11a and 11b based on this information.

The flow rate measurement uses a resin gear 41 shown in FIG. 6. A permanent magnet 42 is embedded in the gear 41, and the sensors 6a and 6b read the change in the magnetic field due to the rotation of the gear 41. The method detects the rotation of the gear.
Almost no pressure difference was observed between the outlets and the inlets of the flow meters 5a, 5b. This is the gear 41 of the flow meters 5a, 5b.
Is small, and the rotational load by measurement is small. That is, the influence of inserting the flow meter in the flow path of the liquid is small, and a more accurate flow rate can be measured. Therefore, the amount of liquid sent to the jetting machine 8 can be accurately controlled, so that the mixing ratio can be accurately controlled, and the quality of the waterproof film can be made uniform.

Further, Teflon rings 47a, 47b are provided on the bearings of the gears of the gear pumps 2a, 2b for feeding the main agent 1a and the hardener 1b under pressure, so that the packing 45 is protected. Therefore, the packing 45 can be prevented from being out of shape, and the sealing performance of the bearing portion is improved. Therefore,
A high pressure can be applied to the gear pumps 2a and 2b, the discharge amount of the pumps 2a and 2b increases, and a waterproof film can be applied over a wide area in a short time.

In the jetting machine 8, the compressed air inlet 22
Is connected to a compressor, and compressed air of a predetermined pressure is introduced. The liquid main agent 1a and the hardener 1b are separately introduced into the hoses 7 from the left and right. The main agent 1a and the curing agent 1b supplied from the hoses 7, 7 are sent by a pressure feeding mechanism having the gear pumps 2a, 2b shown in FIGS. When the trigger 21 is pulled, the valve 23 is opened via the shaft 24, and the compressed air flows through the air paths 25, 3
Outlets 38 of the static mixing section 28 through
It is led to the vicinity. On the other hand, the main agent 1a and the curing agent 1b are supplied from hoses or 7, 7 provided on both sides, respectively.
It is sent to the static mixing unit 28 from the introduction ports 37a and 37b through the introduction paths 30 and 30. In the static mixing section 28, a screw guide 29 disposed inside the static mixing section 28
As a result, both liquids are sufficiently mixed and stirred while passing therethrough, and are discharged from the outlet 38 in a state of being sufficiently mixed. At the outlet 38, compressed air passes through this area at high speed,
The liquid sucked and mixed by the nozzle 27 rides on the flow of the compressed air to form a mist and is ejected from the ejection port 27 a of the nozzle 27. The particle size of the mist state of the mixed liquid 9 at the time of this ejection is 2 to 2.
3 μm. The operator moves the jetting machine 8 while
A mist mixture 9 spouted from a nozzle 27 on a concrete surface (base) 10 such as the roof of a building or the floor or side surface of a pool
To form a urethane waterproof film having a predetermined thickness.

In order to confirm the effects of the present embodiment, while maintaining the pressure of the compressed air at 5 kg / cm ² at the nozzle tip using the jetting machine 8 and the control mechanism, a polyether-based polyol as the main agent 1a and a curing agent A mixed solution in which the isocyanate prepolymer as 1b was mixed at a weight ratio of 100: 80 was jetted at a rate of 3 L / min to a workpiece 1 m away from the work, a 2 mm thick waterproof film was formed, and the physical properties were measured.

First, the moisture permeability was examined as follows.
500 g of anhydrous calcium chloride was placed in a glass container having an opening area of 200 cm ² , and a 2 mm-thick waterproof film applied as described above was peeled off from the base and closed, and the periphery was sealed. The humidity in the glass container is maintained at 0% by anhydrous calcium chloride. The glass container thus closed with the waterproof film was placed in a constant temperature and humidity room at a temperature of 25 ° C. and a humidity of 90%. The saturated steam pressure in steam at 25 ° C. is 23.
Since it is 76 mmHg, the water vapor pressure difference between the constant temperature and humidity chamber and the glass container is 21.38 mmHg. After placing this glass container in a constant temperature and humidity chamber for 24 hours, it was taken out and the total weight of the glass container was examined.
Was increasing. Breathable waterproof film construction in the present embodiment from the experiment, i.e., waterproof film of 1 m ² was confirmed that the amount of water vapor to be transmitted per 24 hours is 87.01G. Also, from this experiment, the moisture permeability coefficient, that is, 1 m
^The amount of water vapor permeated per hour under the environment of water vapor pressure difference of 1 mmHg by the waterproofing membrane of No. 2 was 0.1696 g.
Since the moisture permeability coefficient of the waterproof film having a thickness of 2 mm constructed by the conventional construction method is about 0.08 g, it can be seen that the moisture permeability in this embodiment is about twice as high. Due to this moisture permeability, the water vapor generated from the underlayer can be sufficiently radiated to the outside, so the strength is obtained, but the underlayer that may release the water vapor such as on concrete that has not been dried sufficiently yet. , The water vapor can be radiated to the outside. Therefore, even if a waterproofing membrane is applied when the strength of the concrete is obtained, water will not collect between the waterproofing membrane and the concrete surface, preventing blisters, etc., and deteriorating the adhesion between the waterproofing membrane and the concrete surface. There is no.

Further, an underlayer adhesion strength experiment as described below was performed. A one-component moisture-curable polyurethane resin primer is applied on a JIS walking board at 0.2 kg / cm ² and left at room temperature for 6 hours after application, and then a waterproofing film is formed to a thickness of 3 mm by the working method of this embodiment. And cured for one week. Thereafter, the adhesive strength was measured to be 30.9 kg / cm ² per 1 cm ^{2 according} to the Kenken formula. The waterproofing membrane constructed by the present inventors' conventional method has an adhesion strength measured by the same method as described above of 21.4 kg / cm ² , and it can be seen that the adhesion strength is improved as compared with the conventional case. .

The other physical properties were as follows. The touch drying time is 10 seconds, the time to be able to walk on the waterproof film is 20 minutes, and the complete curing time is 26 hours, and there are some fluctuations depending on the ambient temperature and humidity. Also, JIS
The hardness was 7 as measured by the method according to K 6301.
Four degrees, the tensile strength was 115 kg / cm ² , the elongation at break was 380%, and the tear strength was 49 kg / cm ² .

When the main component 1a of the polyether polyol used in the present embodiment and the curing agent 1b of the isocyanate prepolymer are mixed, the mixture cures in 5 to 15 seconds.
When the jetting is completed, the mixed liquid remaining in the static mixing section 28 starts to harden. In this embodiment, the static mixing unit 28 is made of a cheap resin material and is disposable, so that it can be easily attached and detached.
Maintenance of the jetting machine 8 is also easy.

[0033]

According to the present invention, it is possible to efficiently form a urethane waterproofing film having excellent moisture permeability and excellent adhesion strength to a workpiece.

[Brief description of the drawings]

FIG. 1 is a schematic diagram showing the configuration of an embodiment of the present invention.

FIG. 2 is a block diagram of a mechanism for controlling a mixing ratio of a main agent and a curing agent in the embodiment.

FIG. 3 is a side view of the jetting machine used in the embodiment.

FIG. 4 is a sectional view of the vicinity of a nozzle of the ejector of FIG. 3;

FIG. 5 is an exploded perspective view of the vicinity of a nozzle of the ejector of FIG. 3;

FIG. 6 is a perspective view showing a gear used for the flow meter of the embodiment.

FIG. 7 is a sectional view of the vicinity of a bearing portion of the liquid pressure feeding gear pump of the embodiment.

FIG. 8 is a view showing a problem of a waterproofing membrane constructed by a conventional method.

[Explanation of symbols]

 Reference Signs List 1a Main agent 1b Hardener 2a Gear pump for pumping main agent 2b Gear pump for pumping hardener 5a Flowmeter for main agent flow measurement 5b Flowmeter for measurement for hardener flow 6 Magnetic sensor 8 Ejector 10 Primer-coated base 26 Outer cylinder 26 27 Nozzle 28 Static mixing section 29 Screw guide 41 Resin gear 42 Packing 47 Teflon ring

──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Yoshito Kawada 2-27-204 Takasu-cho, Nishinomiya City, Hyogo Prefecture Kawata Giken Co., Ltd. Address (56) References JP-A-4-131156 (JP, A) JP-A-62-14969 (JP, A) JP-B-54-32014 (JP, B2) (58) Fields investigated (Int. ⁷ , DB name) E04D 7

Claims (3)

(57) [Claims] 1. A high-speed curable urethane resin base liquid and a curing agent liquid thereof are fed under pressure to a static mixing section formed by a screw guide, and these two liquids are mixed in a static mixing section. Outlet of the mixed liquid to the static mixing section
Between the static mixing section and the outer cylinder that covers it
Waterproofing construction in buildings characterized by forming a urethane waterproofing film on the surface by spraying it from the nozzle part on the flow of compressed air flowing through the air path formed in the building and spraying it on the work piece Method. 2. A high-speed curable urethane resin base material liquid and its hardener liquid are fed to a static mixing section while the mixing ratio is maintained at a predetermined value, with the total supply amount of both liquids being adjustable. The method for constructing a waterproofing film in a building according to claim 1, wherein: 3. The method for constructing a waterproof film in a building according to claim 1, wherein the high-speed curing urethane resin base solution and the curing agent solution are pressure-fed to a static mixing section using a gear pump.