JPH0762638A - Multi-service culvert and construction method thereof - Google Patents

Abstract

PURPOSE:To form a multi-service culvert which has flexibility to follow with a displacement produced in the multi-service culvert and thereby protects a joint unit from water leakage, and what is more, which can be waterproofed with ease without generating public hazards and enhance construction accuracy as well. CONSTITUTION:A multi-service culvert 1 is constructed on a polyurethane resin layer of floor concrete 2 where a polyurethane concrete coating film 4 is coated at the thickness of about 3mm. A joint area is coating with a polyurethane coating band 4a at the thickness of about 5mm.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a common groove and its construction method.

[0002]

2. Description of the Related Art Normally, a common groove is constructed of cast-in-place concrete, but other than this, a method of constructing by connecting an underdrain block is used. In each of these cases, asphalt waterproofing is used, and as shown in FIG. 14, asphalt sheets 30 are wound in multiple layers on the outer peripheral front surface of the joint groove 20, and the joint portion is stopped all around the joint end surface. There is a water plate inside.

However, this asphalt waterproofing has a pollution problem that smoke and a bad odor are generated because a high heat treatment is required at the time of construction, and when the joint groove is backfilled, the asphalt waterproofing layer is made by a backfill material such as earth and sand. Since it was damaged or cracked, its surface was covered with a protective material. Therefore, in recent years, polymer-based sheet waterproofing has been used in place of this asphalt waterproofing.

[0004]

However, this sheet waterproofing also has a problem that the sheet seam construction accuracy is poor, and when the joint portion is displaced, it cannot follow this and there is a risk of water leakage.

Further, this method is not a flash which is relatively expensive, it has various problems such as poor adhesion of the wet surface and difficulty in the construction of the protruding corners, and is still a probable method. The current situation is that there are none.

The present invention has been made in view of the above problems, and an object thereof is to provide a joint groove that does not leak water from a joint portion even if the joint portion is displaced, following the displacement. When constructing a common groove, it is to prevent pollution during waterproof construction and to improve the construction accuracy.

[0007]

Means for Solving the Problems The gist of the common groove of the present invention for achieving the above object is to cover the entire outer peripheral surface of the common groove constructed by continuously connecting the underdrain blocks with a coating film. This means that the joint portion of the underdrain block is covered with a coating film thicker than the others. Further, the construction method of the common groove is that a synthetic resin layer having an appropriate thickness is formed on the floor concrete of the open-cut groove, and the underdrain block is continuously laid on the synthetic resin layer to construct the common groove, This is because the entire outer circumference of the common groove was covered with a coating film, and the joint portion of the underdrain block was covered with a coating band thicker than the others.

The coating film and the synthetic resin layer are polyurethane resins having a curing speed within 60 seconds to dry by touch. This is because a horizontal portion such as a floor or a ceiling and a vertical surface or an inclined surface such as a wall are simultaneously applied with the same material to obtain a seamless coating, and the most preferable dry time to touch is 4 to 30 seconds. Further, if the touch-drying time is 60 seconds or more, liquid sagging occurs on the vertical surface or the inclined surface, and it becomes impossible to obtain a uniform film thickness.

As the sprayable polyurethane resin, one having a specific gravity of 0.9 or more at the time of molding is used.
This is because the physical properties and waterproof performance tend to deteriorate as the specific gravity decreases.

The conditions for spraying the polyurethane resin are as follows:
The liquid pressure is set to about 100 kg / cm @ 2 and the liquid temperature is set to 40 to 70.degree. Therefore, the spray gun used for spray coating uses a collision mixing type, and in consideration of workability and environment, the cleaning method of the gun is a mechanical type by loading and unloading the rod without using a solvent, rather than a type using a solvent. The air cleaning type is preferable.

The coating film is applied at a discharge rate of the resin of about 5 to 10 kg / min per spray gun, and since the specific gravity of the polyurethane resin is about 1, it is 100 when applied to a thickness of 3 mm. It has a construction capacity of ~ 200m2 / hour. Therefore, it is possible to cover the necessary parts in a short time, and it is possible to reduce the influence of external factors such as rain after construction because the time required for curing is short.

The coating film has a thickness of 1 to 5 mm and is continuously laminated. Although the thickness of the joint differs depending on the joint width and the predicted displacement measurement value, it should be 30% or more thicker than other parts in order to cope with the occurrence of displacement, and the increased thickness should be 5%.
Spray construction with a width of 0 cm or more.

Further, when the coating film is applied, the use of a primer can improve the adhesive strength to the concrete foundation.

As the primer, various materials such as urethane type, acrylic urethane type, epoxy type, epoxy urethane type, synthetic rubber type and silane type can be used. However, when urethane type having an isocyanate group at the end is used,
Even in a wet state where the base is slightly wet, the isocyanate group reacts with the water content of the base, so that a uniform coating film can be obtained by finishing the surface with mortar in advance. In particular, by applying a material in which cement is mixed with polymer cement (resin mortar) or a one-component urethane primer, the finish of the concrete is improved because the concrete does not become unsteady.

[0015]

In the present invention, since the coating film on the outer peripheral surface of the common groove is sprayed with a liquid material, a constant thickness can be secured irrespective of the shape of the base, and the work can be applied to the corners of the projected corner or around the accessory. Can be done very easily. Further, at the time of construction, the environment can be kept good without causing pollution, etc., and the construction accuracy can be improved, so that perfect leakage prevention can be performed.

Further, since the joint portion of the underdrain block is coated thicker than the others, even if the joint portion is displaced, it can be easily followed and it is possible to prevent water leakage from the joint portion.

Further, it is possible to cope with a portion which is structurally prone to cracks other than the joint portion, and to form a coating film with a minimum necessary thickness on a portion having a long durability and long-term waterproofing. it can.

Further, after constructing the joint groove on the synthetic resin layer of the floor concrete, the entire circumference of the joint groove is covered with a coating film to waterproof the entire circumference of the joint groove including the lower surface. Became possible.

[0019]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is a sectional view in the longitudinal direction of a joint groove formed of cast-in-place concrete, FIG. 2 is a sectional view in the same transverse direction, and FIG. 3 is a sectional view of a joint portion of the joint groove. The common groove 1 is constructed by continuously connecting the underdrain blocks 1a made of cast-in-place concrete.

The common groove 1 is constructed on a polyurethane resin layer 3 formed on a floor concrete 2, and a polyurethane coating film 4 having a thickness of 3 mm is coated on the entire outer periphery thereof.
A polyurethane coating band 4a having a thickness of about 5 mm and a width of 60 cm is applied to the joint portion 5 by spraying over the polyurethane coating film 4, and both ends thereof are applied over the polyurethane resin layer 3 by spraying.

The joint portion 5 is a joint portion between the underdrain blocks 1a or a joint portion between the underdrain block 1a and the rising portion of the manhole. As shown in FIG. 3, a water stop plate 6 is inserted between the joint surfaces. The joint is filled with urethane joint material 6a and waterproofed. Therefore, (2) in FIG.
As shown in FIG. 6, even if the joint portion 5 is displaced, it can be easily followed, so that water does not leak from the joint portion.

As the polyurethane coating film 4 and the polyurethane coating band 4a, rim spray F-1000 (ultra-fast curing urethane spray material manufactured by Mitsui Toatsu Chemicals, Inc.) was used. This is a super-curable polyurethane resin in which an isocyanate component of the main material is mixed with a special mixed resin as a curing agent at a compounding ratio of 1: 1 and, as shown in FIG.
Two liquids at 0 ° C. are discharged from each discharge pump 7 to 80 to 12
It is discharged at a pressure of 0 kg / cm 2 and collided and mixed at the discharge port of the spray gun 8. As shown in Table 1 below, the pot life is several seconds, the touch dry time is 8 to 20 seconds,
It has physical properties such as curing time of 30 minutes and elongation of 410%.

[Table 1]

The construction method of this joint groove will be described below with reference to FIGS.
It will be described based on. First, as shown in FIG. 6, resin mortar 9 (cation tight:
(Made by Yabhara Sangyo Co., Ltd.) to smooth the surface, and then a polyurethane resin is spray-coated on the entire surface of the resin mortar 9 to form a polyurethane resin layer 3 having a thickness of about 3 mm.

Next, a mold is assembled on the polyurethane resin layer 3 to arrange reinforcing bars, and then concrete is placed in the mold to construct the underdrain block 1a. The underdrain block 1a has a length of about 30 m, and is constructed continuously, with a water stop plate 6 interposed in the joint portion 5, and the joint is filled with a urethane joint material 6a to connect them. By doing so, the joint groove 1 is constructed.

Next, the cement-based polymer 10 is applied to the outer peripheral surface of the joint groove 1 thus constructed, and a polyurethane resin is spray-applied from the cement-based polymer 10 on the outer surface of the common groove 1 to cover the polyurethane with a thickness of about 3 mm. The film 4 is formed.

Next, the joint portion 5 of the common groove 1, that is, the joint portion between the underdrain block 1a and the joint portion between the underdrain block 1a and the rising portion of the manhole is about 5 mm thick and 6
A polyurethane coating band 4a having a width of 0 cm is applied so as to be sprayed on the polyurethane coating film 4. In this way, by spraying the polyurethane coating band 4a over and applying it thickly, even if the joint portion 5 is displaced, it can be easily followed, so that water leakage from the joint portion 5 can be prevented.

In the above embodiments, the case where the joint groove 1 is constructed of cast-in-place concrete is described, but the present invention is not limited to this, and the precast underdrain block 1a is continuously formed. It can also be used in a joint groove constructed by connecting, and in this case, the polyurethane resin is spray-coated by the same method as described above.

Next, the adhesive portion of the polyurethane coating film,
That is, the test results of measuring the adhesive strength of the sprayed portion will be described. First, in the sheet pasting method, the sheets are adhered to each other by heat or an adhesive material, but it is impossible to completely adhere them due to manual work. For this reason, the adhesion area of the sheet is usually increased to prepare for partial adhesion failure.

However, when there is a step or unevenness in the projected corner entry portion or the bonded portion, a floating portion may occur on the sheet and adhesion failure may occur. On the other hand, according to the present invention, since the liquid resin is sprayed on and adhered to the existing portion, even if there is unevenness, the resin can be closely adhered in accordance with the shape of the base, and at the same time, the resin is changed from liquid to solid. Completely integrated because it is cured by reaction and adheres. Therefore, even when the body is displaced and stress is applied to the polyurethane coating film, the polyurethane coating film is not separated from the adhesive portion, that is, the sprayed portion.

FIG. 9 shows a sample 11 obtained by measuring the adhesive strength of the adhesive portion between the polyurethane coating films, that is, the blown-up portion, and the same rim spray as the above material (manufactured by Mitsui Toatsu Chemical Co., Ltd.). Ultra fast curing urethane spray material) was used. The molding conditions were such that the liquid temperature was 60 ° C. for both the main material and the solidifying agent, and then the pressure was 100 kg / each using a H-200 type high pressure spray machine (manufactured by Gasmer, USA).
The pressure was raised to cm2, a round chamber # 1 was attached to a propeller gun (two-liquid collision mixing gun manufactured by US Glasscraft Co., Ltd.), and a predetermined thickness was sprayed onto a polypropylene base plate 12.

After confirming that sufficient rubber elasticity was developed in the spray-overlapped portion (5 minutes after molding), it was spray-molded to a width of 40 mm to obtain Sample 11. As a comparison material, custom PA, which is a rubber asphalt sheet waterproofing material for room temperature method
(Manufactured by Nisshin Kogyo Co., Ltd.) was applied by roller bristles and adhered. Next, these samples 11 were placed in a thermostatic chamber (20 ° C, 55%
And RH) were left to stand for 10 days before measurement.

The shape of the sample 11 is as shown in FIG. 9, and the test conditions are a test humidity of 20 ° C. and a tensile strength of 2
The tester used was a Tensilon type tensile tester (manufactured by Toyo Baldwin) at 00 mm / min.

As a result, as shown in Table 2 below, in the rim spray, peeling did not occur because the adhesive portion was completely integrated. For this reason, when a tensile test was conducted, the strength of the adhesive portion increased because the thickness of the adhesive portion was doubled, and the fracture occurred at a portion other than the adhesive portion.

On the other hand, the rubber asseat is peeled off and its strength is lower than that of the rim spray. Moreover, when the thickness of the rim spray is increased, the strength at break also increases. From the above, it can be seen that the polyurethane coating film of the present invention is wholly integrated and has high strength.

[Table 2]

Next, the test results of the watertightness of the adhesive portion of the polyurethane coating film will be described. Also in this case, the sample 11 was prepared by using the same material and method as described above, but was also performed when the base had irregularities.

That is, as shown in (1) of FIG. 10 with a rim spray and a rubber ass sheet, a flat surface of 20 m
As shown in (2) of FIG. 11, the sample 11 spray-formed or adhered to a width of m, and a cylinder of 2.5 mm in diameter was put in a flat base plate and sprayed to a width of 20 mm on a convex base plate. Alternatively, the adhered sample 11 was subjected to a water tightness test by applying it to a water pressure tester 13 shown in FIG. In this test, the number of test pieces is 4, the test water pressure is 3 kg / cm 2, and the test time is 1 week.
And

As shown in Table 3 below, the above test results show that when the conventional method has irregularities on the base, the rigidity of the sheet itself does not allow the base sheet to adhere to the base sheet, resulting in insufficient adhesion and water leakage. There is a case. On the other hand, according to the method of the present invention, since the liquid resin is sprayed even in the presence of irregularities, the adhesion to the base is sufficient, and the adhesive strength is ensured and sufficient watertightness can be maintained.

[Table 3]

Next, the test results regarding the relationship between the coating thickness and the crack resistance will be described. This is because the joint portion of the common groove may be moved by an external force, so that the polyurethane coating film is subjected to tensile stress. Therefore, in the present invention, the joint portion is made thicker than the other portions, but the degree of hardening is tested.

This test method was carried out in accordance with "Test method for coating film waterproof material (KMK method)" of the Housing and Urban Development Corporation. That is, as the base plate 12, the surface of the asbestos cement plate (flat plate 8 mm) specified in JIS A5403 (asbestos slate) is # 4.
After polishing with No. 0 sandpaper, 150 g / m @ 2 of Sun-PC (one-component moisture-curing urethane primer: manufactured by Mitsui Toatsu Chemical Co., Inc.) was applied as a primer and dried for 2 hours. Then, a rim spray (ultra-fast curing type urethane spray material manufactured by Mitsui Toatsu Chemical Co., Inc.) was sprayed on this by a predetermined thickness in the same manner as described above, and sample 11 as shown in (1) and (2) of FIG. Was prepared and tested by the method shown in (3) of FIG.

The above test results show that, as shown in Table 4 below, as the coating thickness of the rim spray is increased, the strength of the waterproof layer is improved, the elongation of the reference line is decreased, and the crack resistance index of the base is also reduced. It can be seen that it will decrease. Therefore, when the joint portion moves, the coating film is adhered to the base, and therefore the movement can be dealt with only in the thickness direction, and the thickness is increased (the coating film is stretched). Therefore, the thicker the film, the more advantageous it is and the more difficult it is to break.

The strength of the waterproof material in Table 4 below is almost equal to the breaking strength at the maximum value in the tensile test, and the elongation rate of the reference line is the elongation rate of the reference line when the base crack width is 5 mm. The crack load resistance index is a load resistance index when the base crack width is 5 mm.

[Table 4]

Next, the test results of the adhesive force with the base will be described. This was subjected to an adhesion test on the same substrate (asbestos slate) as described above. As shown in FIG. 13, after polishing the surface of the base plate 12 with # 40 sandpaper, a two-component epoxy urethane UP-10 was used as a primer.
00 was used at 120 g / m 2.

Then, after air drying for 3 hours, rim spray was applied to a thickness of 3 mm under the same conditions as described above to form Sample 11. This coating method is 1 mm at a time,
The rubber assheet used above for comparison was adhered by using the custom primer PB on the base plate 12 treated in the same manner as above.

This test method was performed under the same conditions as the adhesive strength of the adhesive portion of the polyurethane coating film 4 described above. From these results, as shown in Table 5 below, it can be seen that the adhesive strength is better than that of the conventional method.

[Table 5]

[0045]

EFFECT OF THE INVENTION Since the polyurethane coating film is coated more thickly than the others in the joint portion of the joint groove, even if the joint groove is displaced, it can easily follow this, preventing water leakage from the joint portion. can do.

Further, by constructing the joint groove on the polyurethane resin layer of the floor concrete and then covering the entire outer periphery of the joint groove with the polyurethane coating film, the waterproof construction can be carried out efficiently and without causing pollution. It can be done easily and the construction accuracy can be improved.

Since the concrete surface can be smoothed by applying the cement-based polymer before applying the polyurethane coating film, the adhesive force of the polyurethane coating film can be increased and the occurrence of pinholes can be reduced. You can

Since the polyurethane coating film can be continuously spray-applied by a machine, liquid dripping does not occur, and the horizontal surface as well as the vertical surface can be simultaneously constructed with the same material, so that it is possible to apply it in the corner The construction can be easily performed, and a uniform and seamless polyurethane coating film can be formed.

[Brief description of drawings]

FIG. 1 is a sectional view of a common groove.

FIG. 2 is a sectional view taken along line aa of FIG.

FIG. 3 is an enlarged sectional view of a joint portion.

FIG. 4A is a cross-sectional view of the joint portion, and FIG. 4B is a cross-sectional view of the joint portion with displacement.

FIG. 5 is a perspective view of a spraying device.

FIG. 6 is a cross-sectional view of floor concrete.

FIG. 7 is a plan view of floor concrete.

FIG. 8 is a cross-sectional view of a common groove constructed on floor concrete.

FIG. 9 (1) is a plan view of a sample of a spray-overlaid portion of a polyurethane coating film, and FIG. 9 (2) is a side view of the same.

FIG. 10 (1) is a plan view of a sample of a polyurethane coating film on which sprayed parts are overlapped, and FIG. 10 (2) is a side view of a sample having the same convex part.

FIG. 11 is a front view of a water pressure tester.

FIG. 12 (1) is a plan view of a sample in which a polyurethane coating film is sprayed on a base plate, (2) is a side view of the sample, and (3) is a plan view showing a test method.

13A is a plan view of a sample in which a polyurethane coating film is sprayed on a base plate, and FIG. 13B is a side view thereof.

FIG. 14 is a cross-sectional view of a conventional joint groove.

[Explanation of symbols]

 1 Common groove 2 Floor concrete 3 Polyurethane resin layer 4 Polyurethane coating film 4a Polyurethane coating band 5 Joint part 6 Water stop plate 8 Spray gun 9 Resin mortar 10 Cement-based polymer

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hirohide Sakaguchi 1190 Kasama-cho, Sakae-ku, Yokohama-shi, Kanagawa Mitsui Toatsu Chemical Co., Ltd. (72) Kazuo Taniguchi 1190 Kasama-cho, Sakae-ku, Yokohama, Kanagawa Mitsui Toatsu Inside Chemicals Co., Ltd. (72) Inventor Tetsuyoshi Ogura 1190 Kasama-cho, Sakae-ku, Yokohama-shi, Kanagawa Mitsui Toatsu Chemicals, Inc.

Claims (3)

[Claims] 1. A joint groove, characterized in that the joint groove, which is constructed by continuously connecting the underdrain blocks, has an outer peripheral surface entirely covered with a coating film. 2. A polyurethane resin layer having an appropriate thickness is formed on the floor concrete of the open cut groove, and a underdrain block is continuously laid on the polyurethane resin layer to construct a common groove, and the entire outer circumference of the common groove is formed. A method for constructing a joint groove, which is characterized in that the above is covered with a coating film. 3. The joint groove according to claim 1, wherein the joint portion of the joint groove is covered with a cover band thicker than the other joints.