JP5395548B2 - Joint structure - Google Patents

Description

  The present invention relates to a joint structure of a water channel.

  Water tanks for concrete structures and expansion joints for waterways are used to prevent water leakage with waterstops and elastite. There is water leakage from the expansion joint due to aging deterioration of the water stop plate, rubber packing, and sealing material, etc. As a repair, sealing material filling, rubber packing mounting, flexible polymer cement coating, etc. are performed. Due to these deteriorations, water leakage and inflow of backwater, that is, spring water are generated. Repair with rubber packing is performed by cutting the concrete joints to widen the joint width, which increases the construction cost and cannot be adopted when the damage is wider than the packing width or when the shape is complicated.

  Various structures and construction methods as described below are disclosed, but not all of workability and durability are satisfactory.

  In agricultural canals formed by arranging a large number of U-shaped concrete blocks, packing is filled in the gaps between the blocks so that they are flush with the inner surface of the water channel or dropped from the inner surface, along the joints A series of 0.5 mm to 3 mm thick coating strips made of a solvent-free polyurethane resin coating is formed from the upper left edge of the block to the upper right edge with a width covering the edge of the block and the joint. It is disclosed that the provided agricultural waterway has a joint portion having high followability to the displacement between concrete blocks and deformation of the concrete, and there is little water leakage. (Patent Document 1)

  Apply a primer with a constant width on the surface of the filler and the left and right sides of the joint of the agricultural waterway, and apply an elastic resin material with a constant thickness within the range of the width of the primer. A mesh-like sheet material made of a low-stretch material is placed, and an elastic resin material is applied on the sheet material with a certain thickness to cure these resin materials and prevent joint damage. It is disclosed to suppress aging degradation. (Patent Document 2)

  However, these are intended to suppress aging deterioration such as followability and joint breakage, but the process is complicated and concrete joint durability against repeated expansion and contraction due to temperature changes of concrete is not obtained. There wasn't.

JP-A-9-31944 JP 2001-271326 A

  The problem to be solved is the provision of a joint structure having the stretching and durability of the irrigation joint and the wear resistance.

The invention of claim 1, concrete canal, Ri joint structure der waterways type gutter, sealant filling is subjected coated further over the joints both sides joints, urea-urethane resin coating is applied thereon The joint structure is characterized in that the thickness of the sealing material applied to both sides of the joint part is 1 mm or more and the width is 20 mm or more. In addition, the workability is high, it can be applied to existing joints, and in a concrete length of 10 m, which is generally used, it is durable to cope with the distortion to the joint part of thermal expansion / contraction.

The invention according to claim 2 is the joint structure according to claim 1, wherein the sealing material is a silyl group-terminated polyalkylene oxide resin or an epoxy resin-modified resin of a silyl group-terminated polyalkylene oxide resin. Excellent adhesion to water and water and alkali.

  According to the present invention, stretch durability that can withstand the warm and cold stretch of concrete in the irrigation canal is obtained, the processing operation is simple, and the existing repair can be easily performed.

FIG. 1 is an explanatory diagram of dimensions of an experimental example.

  The present invention fills the joint with a sealing material with high stretchability and is applied to both sides of the joint, and is coated with urea urethane resin with high strength, high elongation and high wear resistance. Improve the reliability, wear resistance, water stop function, and reliability of joint expansion and contraction of concrete.

  The width of the joints of the irrigation channels for concrete or concrete secondary products varies depending on the environment, shape, construction method, materials used, and the like. With concrete and joints, it is possible to grasp the general movements of the coefficient of thermal expansion of the concrete, with a variable temperature range. Although a safety factor is applied in terms of design, the content designed at the time of new installation may increase the risk due to ground changes, changes over time, etc. The present invention reduces this.

Sealing material <br/> The sealing material is set according to the length of the concrete block, the length of the concrete secondary product, the environment, and workability, giving a safety factor to the dimensional change, and setting the elongation rate Further, it is determined in consideration of the result of the evaluation test by repeated expansion and contraction according to the environmental temperature. Although it can be used with a general-purpose sealing material, a silyl group-terminated polyalkylene oxide resin or an epoxy resin-modified resin of a silyl group-terminated polyalkylene oxide resin is more preferable from the viewpoint of adhesion of concrete and stretching durability. Furthermore, an epoxy resin-modified resin of a silyl group-terminated polyalkylene oxide resin is preferred from the standpoint of water resistance. In the invention of the present application which is coated with urea urethane resin, it has been found that stretching durability is greatly improved by applying this sealing material to the flat portion from the edge of the joint portion. As this method, a tape or the like as a spacer is applied, and a sealing material is applied to this with a scissors or the like. Actually on site, flatness, smoothness, etc. are poor, so it is difficult to secure a predetermined thickness stably, but by applying expansion and contraction repeatedly by applying a thickness of about 1 mm or more and a width of 20 mm or more from the joint edge. Fatigue can be eliminated. The joint depth is about 10 mm or more.
An example of the sealing material for the epoxy resin-modified resin of the silyl group-terminated polyalkylene oxide resin is Joliseal JB-40 (Aika Kogyo Co., Ltd., trade name, representative physical property tensile elongation: 258%, tensile strength: 1.56 MPa). .

  Since the sealing material further improves the adhesion to concrete, an epoxy resin primer or the like can be used as necessary.

Urea urethane resin coating Urea urethane resin coating has high strength, high elongation and high wear resistance, and covers the sealing material to the same width as or more than the coating width. Durability can be imparted by suppressing deformation of the sealing material during repeated expansion and contraction. The urea urethane resin is preferably an amine having an amino group directly attached to the aromatic ring, which can be manually applied in terms of workability, adhesion, and uniform film thickness. This polyureaurethane can be suitably prepared with an elongation ratio, strength, etc., depending on the amine main chain and the polyol used when synthesizing the isocyanate prepolymer. As the physical properties of the coating, the tensile elongation is 200 to 800%, the tensile strength is 1 to 11 MPa, and the thickness is set according to the joint width and environment. The thickness is set in the range of 0.5 to 5 mm. As this urea urethane resin coating material, Jolliseal JBX-152 (Aika Industry Co., Ltd., trade name, aminobenzoic acid type, representative physical properties, tensile strength 10.2 MPa, tensile elongation 700%, tear strength 40 N / mm) is available. .

  After applying the sealing material, a primer is applied as necessary, but may be omitted if the sealing material and the urea urethane resin coating have sufficient adhesion.

  In order to prevent discoloration and gloss change of the urea urethane resin, it is possible to apply a topcoat material having good weather resistance.

  When installing on existing joints, remove the sealing material from the existing joints. For example, in the case of a mortar sealant, the existing sealant is removed to the required depth with a diamond cutter or chisel, and the brittle concrete is removed together with the area where the urea urethane resin coating is applied. In contrast, the processing of the present invention is performed.

  As the environment of the examples, the joint spacing (concrete part) was 10 m, the existing joint width was 20 mm, and the annual temperature difference was 60 ° C. The theoretical movement multiplied by the thermal expansion coefficient of concrete is 6 mm.

The joint part having an existing joint width of 20 mm is removed by 20 mm in depth, and at least 30 mm of the surface from the inner surface and the end part of the joint part is washed with high-pressure water to remove fragile concrete, and after drying, Aikajoly Seal JB-40P ), 0.15 kg / m ² (trade name, solvent-type epoxy resin primer) was applied, and after 2 hours, the side thickness (Fig. 1) 1 side coating thickness D) is filled and applied so as to be 1 mm, and left to stand for half a day. Next day, Joliseal JB-40P2 (Aika Industry Co., Ltd., trade name, solvent-type epoxy resin primer) is set to 0.00. 15 kg / ^{m 2} was applied, the Joli seal JBX-152 over to 30mm surface than 2 hours after joint end denoted coating to a thickness 1 mm, after 5 hours, further, a topcoat material Joli seal JBX-153 (Aica Kogyo (Co.), acrylic urethane coating agent) was 0.2 kg / ^{m 2} coated as in Example 1.

The same as Example 1 except that the side face width C was 20 mm. The joint portion having an existing joint width of 20 mm is removed by 20 mm in depth, and at least 20 mm of the surface from the inner surface and the joint portion end portion is washed with high-pressure water to remove brittle concrete. After drying, Aikajoly Seal JB-40P (Aika Industry Co., Ltd. ), 0.15 kg / m ² (trade name, solvent-type epoxy resin primer) was applied, and after 2 hours, Joliseal JB-40 was filled from the joint edge part to 20 mm part so that the side face thickness would be 1 mm, half a day Stand still, and apply Joliseal JB-40P2 (Aika Kogyo Co., Ltd., trade name, solvent-type epoxy resin primer) 0.15 kg / m ² the next day, and after 2 hours from joint end to 20 mm surface Jolliseal JBX -152 was applied to a thickness of 1 mm, and after 5 hours, Jolliseal JBX-153 (Aika Industry Co., Ltd.), acrylic urethane The coating agent) was 0.2 kg / ^{m 2} coated Example 2.

Comparative Example 1
Example 1 and Jolliseal JB-40 were the same except that they were not applied to the surface. The joint part having an existing joint width of 20 mm is removed by 20 mm in depth, and at least 30 mm of the surface from the inner surface and the end part of the joint part is washed with high-pressure water to remove fragile concrete, and after drying, Aikajoly Seal JB-40P ), 0.15 kg / m ² (trade name, solvent-type epoxy resin primer) was applied, and after 2 hours, Joliseal JB-40 was filled so as to be flush with the concrete surface, left for half a day, and then Joliseal the next day. JB-40P2 (Aika Industry Co., Ltd., trade name, solvent-type epoxy resin primer) was applied at 0.15 kg / m ² , and after 2 hours, the Joliseal JBX-152 became 1 mm thick from the joint edge to the surface 30 mm. subjected Yo coating, after 5 hours, further, Joris seal JBX-153 (Aica Kogyo (Co.)), 0.2 kg / m acrylic urethane coating agent) Coated as Comparative Example 1

  As a situation after one year, Example 1 had no abnormality, Example 2 had a fine crack, and Comparative Example 1 had a clear crack. Example 2 was significant as compared to Comparative Example 1, and it was estimated that this could be achieved by reducing the concrete span (joint spacing) and increasing the joint width.

  The wear resistance of the JBX-152 used was 0.4 g / 1000 times according to JIS K7204 when the wear wheel H22 and the load 1 kg were rotated 1000 times.

The relationship between the coating thickness and width (FIGS. 1C and 1D) of the sealing material and the urea urethane resin coating coating thickness (FIG. 1E) confirmed the effect of the present invention by the following experimental example.
The joint depth (FIG. 1A) was 10 mm, and the joint width (FIG. 1B) was 20 mm.

Stretch Durability Evaluation: Samples of the above configuration experiment were performed by Shimadzu Servo Pulser (Shimadzu Corporation, trade name, fatigue test equipment) with the following condition steps to check whether the paint film floated / cracked and the paint film was broken. The presence or absence of mortar and the presence or absence of cracking of the mortar were confirmed at the end of the step. The case where a defect occurred in any of the items was evaluated as x, the case where the defect was fine was evaluated as △, and the case where there was no defect was evaluated as ◯.
Step 1: Amplitude ± 2mm, 11000 cycles / 23 ° C
Step 2: Perform other than x in Step 1, amplitude ± 3 mm, 11000 cycles / 23 ° C.
Step 3: Perform other than x in Step 2, amplitude ± 4 mm, 11000 cycles / 23 ° C.
Step 4: Other than x in Step 3, amplitude ± 5 mm, 11000 cycles / 23 ° C.
Step 5: Other than x in Step 4, amplitude ± 6 mm, 11000 cycles / 23 ° C.

  When applying urea urethane coatings that improve water-stopping, scouring resistance, and corrosion resistance from inside and outside, the stress of dimensional change concentrates on the joints by implementing the present invention, preventing deterioration of urea urethane coating due to this stress In addition to existing repairs, it can be applied as a new installation, and the same effect can be obtained outside the irrigation canal.

1 Waterway concrete 2 Sealing material 3 Urea urethane coating A Joint depth B Joint width C Side width (sealing material)
D Side coating thickness E Urea urethane resin coating thickness

Claims (2)

Concrete canal, Ri joint structure der waterways type gutter, sealant filling the joints, marked coated further over the joints on both sides, a joint structure urea urethane resin coating is applied thereon, the A joint structure characterized in that the thickness of the sealing material applied to both sides of the joint part is 1 mm or more and the width is 20 mm or more.   The joint structure according to claim 1, wherein the sealing material is a silyl group-terminated polyalkylene oxide resin or an epoxy resin-modified resin of a silyl group-terminated polyalkylene oxide resin.

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