JPS63585B2 - - Google Patents

Description

[Detailed description of the invention]

The present invention relates to an improvement in a crack repair method that involves injecting an adhesive solidifying agent into cracks that occur in concrete structures, stones, etc. Generally, when cracks occur in structures such as concrete beams, columns, and walls, the physical properties of the structure deteriorate significantly, and internal reinforcing bars and steel frames are exposed to the outside air and corrode. Therefore, in recent years, with the development of highly adhesive hardening agents, a crack repair method has been developed in which this is injected into cracks to perform waterproofing treatment and at the same time improve physical properties. However, the curing agents normally used for this type of repair are polyester resin-based, acrylic resin-based, and epoxy resin-based adhesives.The lower the viscosity of these adhesives, the better they can be injected into small areas, and the adhesive after hardening. Although it has high performance, its viscosity increases as the temperature decreases, so if the viscosity is adjusted to be low under low temperature conditions, the adhesion and solidification performance will decrease, and it may not be possible to use it as a consolidation agent. You won't get any more.
For this reason, in the past, cracks could not be repaired under low temperature conditions in winter or in cold regions, and sufficient strength could not be obtained. The present invention was made to solve such problems, and its gist is to form a hardening agent injection path by communicating with a part of the opening of a crack that has occurred in concrete, stone, etc. The other opening of the crack is closed with a sealant, hot air is sent from the solidifying agent injection path to warm the inner surface of the crack, and then the solidifying agent is press-fitted from the solidifying agent injection path. It is characterized by its method of repairing cracks in concrete structures, etc. Next, embodiments of the present invention will be described with reference to the drawings. First, as shown in Fig. 1, wire rods 1,
... at appropriate intervals, apply the sealant 2 to the outside of the wire material 1 as shown in FIGS. 2 and 3, bring the wire material 1 into contact with the surface of the structure, and apply the sealant. Embed within 2. At this time, only one end of each wire member 1 is exposed. As the sealant, conventionally used hot melt, quick setting cement, etc. are used. Further, as the wire material 1, a stretchable rod-shaped or pipe-shaped material such as a vinyl-based synthetic resin material is also used. At the same time, the remaining openings of each of the cracks a, a... and, if the crack a reaches the back surface of the structure, the openings on the back surface are closed with the same sealant 2. The wire material 1 embedded in this way is pulled out after waiting for the sealant 2 to solidify. As the wire material 1 is pulled out, each crack a, as shown in FIG.
A solidifying agent injection path 3 communicating with a is formed. In this way, solidifying agent injection channels 3, 3..., which are covered on the outside with the sealant 2 and communicate with the plurality of cracks a, a..., are sequentially formed at appropriate intervals,
Thereafter, as shown in FIG. 5, hot air is blown from the injection path 3 through the hot air injection pipe 4. At this time, the openings of the injection path 3 except for the part connecting the hot air injection pipe 4 and the part for exhausting air are closed with plugs 5. As a result, the hot air sent from the pipe 4 flows from the injection path 3 to which the pipe 4 is connected to each crack a,
a... is exhausted from the open injection path 3. In this way, the inner surface of the crack is raised to a predetermined temperature, and then the pipe 4 and plug 5 are removed, and the solidifying agent 6 is press-fitted sequentially from the injection path 3 on the end side as shown in FIGS. 6 and 7. . As the solidifying agent 6, a conventionally used polyester resin type, acrylic resin type, or epoxy resin type is used. For press-fitting, a conventionally used manual or power pump is used. Although the above-mentioned embodiment shows an example in which the injection path is formed across a plurality of cracks, in addition to this embodiment, the present invention is applicable to a single crack a as shown in FIG.
Each time, the opening is covered with the sealant 2, and a plurality of injection channels 3' are opened at regular intervals, and after hot air is sent through the injection channels 3', the solidifying agent is injected. It's also good. The present invention is constructed as described above, and by blowing hot air into the crack to heat the inner surface of the crack, and then press-fitting the solidifying agent, it can be heated even in winter or in a cold region. It is possible to inject a solidifying agent, and since the solidifying agent can be further warmed inside or injected without being cooled, the solidifying agent can sufficiently penetrate into the minute gaps within the crack. Moreover, it has become possible to use a highly viscous curing agent with high adhesive and curing performance. Test Example Next, we will show a test example in which heating was performed through hot air. As shown in Fig. 9, a cylindrical concrete block 10 is compressed from both sides using a splitting tester to form a half-split shape, which is then tightened with a wire to form a vertical crack 11 in the center. Then, the opening around the crack 11 except for the top surface of the block 10 was closed with an epoxy resin sealant 12, and an injection port 13 was formed at the bottom of the side surface to communicate with the crack 11. The crack width of this test block 10 is 0.5m/m/
It was in the range of 1.0m/m. A caking agent was injected from the injection port 13 of this block 10 under the following conditions at a pressure of about 10 kg/cm ² . Injection solidifying agent (A) Two-component epoxy compound resin “ThreeBond 2022/” manufactured by ThreeBond Co., Ltd.
2105C” (B) Two-component epoxy compound resin “ThreeBond 2023/” manufactured by ThreeBond Co., Ltd.
2105C”

[Table] Injection conditions (1) Hot air at 100°C was blown from the injection port for 1 hour, and the cement was injected when the internal crack surface temperature was approximately 50°C. (2) Hot air at 200°C was blown from the injection port for 1 hour to inject the cement at an internal crack surface temperature of approximately 80°C. (3) Results without blowing hot air When the caking agent was injected under the above conditions, the results shown in the table below were obtained.

【table】 [Brief explanation of the drawing]

Fig. 1 is a plan view of the wire material placed across the crack, Fig. 2 is a plan view of the wire material buried and covered with a sealant, Fig. 3 is a sectional view taken along the line in Fig. 2, Figure 4 is a cross-sectional view of the solidifying agent injection path formed, Figure 5 is a plan view of the hot air blowing state, Figure 6 is a cross-sectional view of the solidifying agent injected state, and Figure 7 is a cross-sectional view of the solidifying agent injected state.
A line sectional view, FIG. 8 is a plan view of another embodiment, and FIG. 9 is a plan view of another embodiment.
The figure is a perspective view of the test block with the cracks sealed. A... Crack, 1... Linear material, 2... Sealing material, 3... Consolidating agent injection path, 4... Hot air injection pipe, 5... Plug, 6...
Consolidating agent.

Claims (1)

[Claims] 1. Form a solidification agent injection path by communicating with a part of the opening of a crack that has occurred in concrete, stone, etc., and close other openings of the crack with a sealant to close the solidification agent injection path. A method for repairing cracks in concrete structures, etc., characterized by heating the inner surface of the crack by sending hot air through the crack, and then press-fitting a hardening agent from the hardening agent injection path.