JP2642588B2 - Joint ditch and its construction method - Google Patents

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 a construction method thereof.

[0002]

2. Description of the Related Art Generally, a common ditch is constructed of cast-in-place concrete. In addition, a method of connecting a culvert block and constructing it is used. In each case, asphalt waterproofing is used. As shown in FIG. 14, an asphalt sheet 30 is wound around the outer peripheral front surface of the common groove 20 in multiple layers, and the joint portion thereof is fixed to the entire periphery of the joint end face. There is a water plate.

[0003] However, this asphalt waterproofing has a pollution problem that smoke and odor are generated because high heat treatment is required at the time of construction, and an asphalt waterproofing layer is made of backfill material such as earth and sand when backfilling the common groove. There damaged, crack
For example, the surface was covered with a protective material to cause the generation .
Therefore, in recent years, a polymer-based sheet waterproofing has been used in place of the asphalt waterproofing.

[0004]

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

Further, this method is not only relatively expensive, but also has various problems such as poor adhesion of the wet surface and difficulty in constructing the corners at the corners. There is no present.

The present invention has been made in view of such a problem, and an object of the present invention is to provide a joint groove that does not leak water from the joint part following the displacement of the joint part even when the displacement occurs. It is an object of the present invention to prevent pollution when constructing a common ditch and to increase the accuracy of the construction.

[0007]

[Means for Solving the Problems] To solve the above problems,
According to the means of the present invention, the common gutter is provided with a quick-curing hardening over the entire outer periphery of the common gutter constructed by continuously connecting the culvert blocks.
This means that a coating film made of synthetic resin was sprayed and applied. In addition, the construction method of the joint ditch has been
Fast curing of the synthetic resin layer was sprayed form, the synthesis of underdrain blocks on the resin layer <br/> continuously laid build a joint groove, synthesized in rapid curing the outer periphery entire co same groove This means that a resin coating film was applied by spraying.

[0008] The coating film and the synthetic resin layer are polyurethane resins having a curing speed of 60 seconds or less for touch drying. 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 formed with the same material to obtain a seamless coating, and the most preferable touch drying time is 4 to 30 seconds. If the touch drying time is 60 seconds or longer, liquid dripping occurs on a vertical surface or an inclined surface, and a uniform film thickness cannot be obtained.

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 when the specific gravity decreases, the physical properties and waterproof performance tend to decrease.

[0010] The spraying conditions of the polyurethane resin are as follows:
The liquid pressure is about 100 kg / cm 2, the liquid temperature is 40 to 70 ° C., and the two liquids are stirred and mixed with the energy at the time of collision. Therefore, the spray gun used for spray coating uses a collision mixing type, and in consideration of workability and environmental friendliness, the cleaning method of the gun is more mechanical than that of the type using a solvent by inserting and removing a rod that does not use a solvent. And an air cleaning type are preferable.

The coating film is applied at a rate of about 5 to 10 kg / min per spray gun, and the specific gravity of the polyurethane resin is about 1. Has a construction capacity of ~ 200m2 / hour. Therefore, necessary portions can be covered in a short time, and the time required for curing is short, so that the influence of external factors such as rain after construction can be reduced.

The thickness of the coating film is continuously laminated at 1 to 5 mm. The thickness of the joint varies depending on the joint width, the predicted displacement measurement value, and the like.
Spray construction with a width of 0 cm or more.

When a coating film is applied, the use of a primer makes it possible to improve the adhesive strength with the underlying concrete.

As this primer, various materials such as urethane, acrylic urethane, epoxy, epoxy urethane, synthetic rubber, and silane can be used. When a urethane having an isocyanate group at a terminal is used,
Even in a wet state where the base is slightly wet, the isocyanate groups react with the base moisture, so that a uniform coating film can be obtained by finishing the surface smoothly with mortar in advance. In particular, by applying a material in which cement is mixed with polymer cement (resin mortar) or one-component urethane primer, unevenness of concrete is eliminated, so that finishing is improved.

[0015]

According to 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 ensured regardless of the shape of the base, and the work can be applied to the corners outside the corners and around the accessory. Can be performed very easily. In addition, at the time of construction, the environment can be favorably maintained without generating pollution and the like, and the construction accuracy can be improved, so that perfect water leakage can be prevented.

Further, the joint of the culvert block is provided with a joint groove.
Fast curing and synthetic resin thicker than the coating film on the entire outer circumference
Changed to the joint part by spray coating
Position can easily follow this,
Prevents water leakage from

Furthermore, it is possible to cope with a portion which is easily cracked structurally other than the joint portion, and to form a coating film with a minimum necessary thickness at a place where the durability is long and a long-term waterproofing is required. it can.

Further, after the common groove is constructed on the synthetic resin layer of the floor concrete, the entire periphery of the common groove including the low surface is waterproofed by covering the entire outer periphery of the common groove with a coating film. Became possible.

[0019]

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

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

The joint 5 is a joint between the culvert blocks 1a and a joint between the culvert block 1a and the rising portion of the manhole. As shown in FIG. The joint is filled with a urethane joint material 6a and subjected to a waterproof treatment. Therefore, (2) of FIG.
As shown in (1), even when displacement occurs in the joint portion 5, it can easily follow the displacement, so that water does not leak from the joint portion.

As the polyurethane coating film 4 and the polyurethane coating band 4a, a rim spray F-1000 (ultrafast-curing urethane spray material manufactured by Mitsui Toatsu Chemicals, Inc.) was used. This is a super-curable polyurethane resin obtained by mixing a special mixed resin as a curing agent in a mixing ratio of 1: 1 with an isocyanate component of a main material. As shown in FIG.
The two liquids at 0 ° C. are supplied from each discharge pump 7 to
It discharges at a pressure of 0 kg / cm @ 2 and causes collision mixing at the discharge port of the spray gun 8. As shown in Table 1 below, the usable time is several seconds, the dry time for touch is 8 to 20 seconds,
It has physical properties such as a curing time of 30 minutes and an elongation of 410%.

[Table 1]

The construction method of this common groove will be described below with reference to FIGS.
It will be described based on. First, as shown in FIG. 6, a resin mortar 9 (cation tight:
Then, a polyurethane resin is sprayed on the entire surface of the resin mortar 9 to form a polyurethane resin layer 3 having a thickness of about 3 mm.

Next, after forming a formwork on the polyurethane resin layer 3 and arranging reinforcing bars, concrete is poured into the formwork to construct the culvert block 1a. The culvert block 1a has a length of about 30 m and is continuously constructed, a water stop plate 6 is interposed in the joint portion 5, and the joint is filled with a urethane joint material 6a to connect them. By doing so, the common groove 1 is constructed.

Next, a cement-based polymer 10 is applied to the outer peripheral surface of the common groove 1 constructed as described above, and a polyurethane resin is sprayed and applied on the cement-based polymer 10 by a spray gun 8 to form a polyurethane coating having a thickness of about 3 mm. The film 4 is formed.

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

In the above embodiment, the case where the common groove 1 is constructed of cast-in-place concrete has been described. However, the present invention is not limited to this, and the precast culvert block 1a is continuously connected. It can also be used for a joint groove constructed by connection, and in this case, a polyurethane resin is sprayed and applied by the same method as described above.

Next, an adhesive portion between the polyurethane coating films,
That is, a test result obtained by measuring the adhesive strength of the blown portion will be described. First, in the sheet sticking method, the sheets are bonded to each other by heat or an adhesive, but it is impossible to completely bond the sheets due to work by hand. For this reason, the bonding area of the sheet is usually increased to prepare for partial bonding failure.

However, if there is a step or unevenness in the corners at the corners of the outgoing corners or at the bonded portion, a floating portion may be formed on the sheet and poor bonding may occur. On the other hand, in the present invention, the adhesive with the existing part is sprayed with the liquid resin, so that even if there are irregularities, the resin can be adhered to the shape of the base, and at the same time, the resin is changed from a liquid to a solid. To be completely integrated for reaction curing and bonding. Therefore, even when the body is displaced and stress is applied to the polyurethane coating film, the polyurethane body does not peel off from the bonded portion, that is, the blown portion.

FIG. 9 shows a sample 11 when the bonding strength between the polyurethane coating films, that is, the bonding strength of the blown portion was measured, and the same rim spray (manufactured by Mitsui Toatsu Chemicals, Inc.) was used as a material. (Ultra fast curing type urethane spraying material) was used. The molding conditions were as follows: the liquid temperature was set to 60 ° C. for both the main material and the solidifying agent, and then the pressure was set to 100 kg / h using an H-200 type high-pressure spray machine (manufactured by Gasmer, USA)
The pressure was increased to cm 2, and a round chamber # 1 was attached to a propeller gun (a two-liquid collision mixing gun manufactured by Glasscraft Co., USA), and a predetermined thickness was sprayed on a polypropylene base plate 12.

The blown overlapped part after confirming that sufficient rubber elasticity is expressed in (molding 5 minutes after), to obtain a sample 11 by spray molding in 40mm width. As a comparison material, a rubber asphalt sheet waterproofing material for the normal temperature method (hereinafter referred to as rubber asphalt )
A custom PA (manufactured by Nissin Kogyo Co., Ltd.), which is a sheet, was applied and adhered with roller bristles. Next, measurement was performed after leaving these samples 11 in a constant temperature room (20 ° C., 55% and RH) for 10 days.

The shape of the sample 11 was as shown in FIG. 9, and the test conditions were a test humidity of 20 ° C. and a tensile strength of 2
The test machine 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, no peeling occurred because the bonded portion was completely integrated. For this reason, when a tensile test was performed, the strength was increased because the thickness of the bonded portion was doubled, and the fracture occurred at a portion other than the bonded portion.

On the other hand, the rubber assheet is peeled off, and its strength is lower than that of the rim spray. 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 entirely integrated and has high strength.

[Table 2]

Next, the results of a test on the watertightness of the bonded portion of the polyurethane coating film will be described. In this case, the sample 11 was prepared using the same material and method as described above.

That is, as shown in (1) of FIG.
The sample 11 spray-molded or adhered to the m-width and, as shown in (2) of the same figure, a cylinder having a diameter of 2.5 mm is put in a flat underplate and sprayed to a 20 mm-width on the convex underplate. Alternatively, a water tightness test was performed on the bonded sample 11 using a hydraulic tester 13 shown in FIG. In this test, the number of test pieces was four, the test water pressure was 3 kg / cm2, and the test time was one week (the situation was observed as appropriate from the surface of the acrylic plate).
And

The results of the above test are shown in Table 3 below. In the conventional method, if there is unevenness in the base, the sheet does not adhere to the base sheet due to the rigidity of the sheet itself, resulting in insufficient adhesion and water leakage. May be. On the other hand, according to the method of the present invention, even when unevenness is present, the liquid resin is sprayed, so that the adhesion to the base is sufficient, and the adhesive strength is secured, and sufficient watertightness can be maintained.

[Table 3]

Next, test results on 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 a tensile stress. Therefore, in the present invention, the joint portion is made thicker than other portions, but the degree of hardening is tested.

This test method was carried out in accordance with the Housing and Urban Development Corporation “Test Method for Waterproofing Materials for Coating Films (KMK Method)”. That is, the surface of the asbestos cement plate (flat plate 8 mm) specified by JIS 5403 (asbestos slate) is # 4.
After polishing with No. 0 sandpaper, Sun-PC (one-component moisture-curable urethane primer: manufactured by Mitsui Toatsu Chemicals, Inc.) was applied as a primer at 150 g / m 2 and dried for 2 hours. Then, a rim spray (ultrafast-curing urethane spray material manufactured by Mitsui Toatsu Chemicals Co., Ltd.) is sprayed thereon to a predetermined thickness in the same manner as described above, and the sample 11 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 rim spray coating thickness increases, the strength of the waterproof layer increases, the elongation percentage of the reference line also decreases, and the cracking load resistance index of the substrate decreases. It turns out that it falls. Therefore, when the joint moves, the coating is adhered to the base, so that the movement can be dealt with only in the thickness direction, and the increase in the thickness (extension of the coating) corresponds. For this reason, a thicker film is more advantageous and less likely to break.

The strength of the waterproofing material in Table 4 below is almost equal to the breaking strength at the maximum value in the tensile test, and the elongation of the reference line is the elongation 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 strength to the base will be described. For this, an adhesion test was performed on the same base (asbestos slate) as described above. As shown in FIG. 13, after polishing the surface of the base plate 12 with a # 40 sandpaper, a two-pack type epoxy urethane UP-10 is used as a primer.
00 was used at 120 g / m2.

After air-drying for 3 hours, a rim spray was applied to a thickness of 3 mm under the same conditions as above to form Sample 11. This coating method is vertical 1mm at a time,
The horizontal and vertical directions were changed, and the rubber asseat used above for comparison was stuck on the base plate 12 treated in the same manner as described above using a custom primer PB.

This test method was carried out under the same conditions as the bonding strength of the bonding portion of the polyurethane coating 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]

According to the present invention , a synthetic resin is provided on the entire outer periphery of the joint groove with a quick-curing synthetic resin.
By spraying and applying a grease coating,
Perfectly prevents water leakage. In addition, uniform thickness and joint
And a coating film without any can be formed.

The joint section of the culvert block is thicker than the coating film.
Sprayed with a fast-curing synthetic resin coating
This makes it easy to follow even when displacement occurs at the joint.
Water leakage from the joint can be prevented because it can be attached.

It is structurally easy to crack other than at the joint.
Places that require long-term waterproofing,
Coating film is required in places where construction is difficult, such as corners and around corners
It can be easily formed with a minimum thickness.

Rapid hardening sprayed on concrete floor
After forming a common groove on the plasticizable synthetic resin layer,
Spraying a coating film made of synthetic resin with a quick-curing property over the entire outer periphery of the groove
It is easy to waterproof construction by applying
In addition, the entire circumference of the common groove including the bottom surface can be waterproofed. Ma
Pollution does not occur during waterproof construction
The construction environment can be maintained.

[Brief description of the 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.

4A is a cross-sectional view of a joint, and FIG. 4B is a cross-sectional view of the joint in a state where displacement occurs.

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

FIG. 6 is a sectional view of floor concrete.

FIG. 7 is a plan view of floor concrete.

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

FIG. 9A is a plan view of a sample of a blown portion of a polyurethane coating film, and FIG. 9B is a side view of the same.

FIG. 10A is a plan view of a sample of a blow-up portion of a polyurethane coating film, and FIG. 10B is a side view of a sample having the convex portion.

FIG. 11 is a front view of the hydraulic tester.

12A is a plan view of a sample in which a polyurethane coating film is sprayed on a base plate, FIG. 12B is a side view of the sample, and FIG. 12B is a plan view showing a test method.

FIG. 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 of the same.

FIG. 14 is a sectional view of a conventional common groove.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Joint 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 polymer

 ──────────────────────────────────────────────────続 き Continued on the front page (72) Inventor Hirohide Sakaguchi 1190 Kasama-cho, Sakae-ku, Yokohama-shi, Kanagawa Prefecture Inside Mitsui Toatsu Chemicals Co., Ltd. (72) Inventor Kazuo Taniguchi 1190 Kasama-cho, Sakae-ku, Yokohama-shi, Kanagawa Mitsui Within Chemical Co., Ltd. (72) Inventor Tetsuyoshi Ogura, 1190 Kasama-cho, Sakae-ku, Yokohama-shi, Kanagawa Mitsui Toatsu Chemicals Co., Ltd. (56) References JP-A-56-25525 (JP, A) JP-A-63-167814 ( JP, A) JP-A-3-103554 (JP, A)

Claims (3)

(57) [Claims] 1. A coating film made of a fast-curing synthetic resin over the entire outer periphery of a common groove constructed by continuously connecting culvert blocks.
The joint groove is characterized by being spray-coated . 2. The hardening of the hardened concrete on the floor concrete in the cut trench
Synthetic resin layer sprayed form, the underdrain blocks on top of the synthetic resin layer is continuously laid build a joint groove blows periphery entire surface fast curing synthetic resin coating film of the co same groove
Construction method of joint groove characterized by being applied . 3. The joint section of the culvert block has a common groove.
Synthetic resin with faster curing than the coating film on the entire outer circumference
Joint grooves in serial mounting with claim 1, characterized in that coated blowing fat made of the coating zone.