JPS6339749B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method of injecting a hardening agent into cracks in order to repair cracks in concrete structures and improve their physical properties.

Generally, when cracks occur in concrete beams, columns, walls, etc., physical properties such as bending stress are significantly reduced. Therefore, in recent years, high-performance solidifying agents have been injected into the cracks in order to repair the cracks and improve the physical properties of the beams, columns, walls, etc.

When injecting a solidifying agent into these cracks, conventionally, as shown in Japanese Patent Publication No. 10573/1983, the openings of each crack were left as injection ports at regular intervals, and other parts were injected into the cracks. The common method was to apply a sealant to close the opening, and then use a pump to inject a solidifying agent through the opening.

However, as shown in Figure 1, in general, structures have a large number of cracks a, a, ... that radiate from a part A where stress is concentrated, and these cracks can be fixed using the conventional method described above. When injecting binder, it was necessary to inject it many times for each crack, which caused problems in workability.

In addition, in this conventional method, the worker visually confirms the location of the crack and repairs that part, so it is difficult to pick up so-called hair cracks that are difficult to see, and this makes it difficult to maintain the strength of the structure. There was a problem that no proper repairs could be made.

Furthermore, the solidifying agents to be injected are usually polyester resin-based, acrylic resin-based, and epoxy resin-based, and these solidifying agents become more viscous as the temperature decreases, so they cannot be used at low temperatures. If it has fluidity that allows it to be injected, it will not solidify. Therefore, in order to have the desired solidification performance at low temperatures, a viscosity above a certain level is required, which makes it impossible to inject the resin into cracks sufficiently.

In addition, these solidifying agents generally have the property that their viscosity decreases and their fluidity increases as the temperature rises, and by raising the temperature of the bonded part higher than the temperature of the solidifying agent injected, This improves the ability to flow into details and improves adhesion. On the other hand, when the temperature of the part to be adhered becomes low, the inflow is inhibited and the adhesion is reduced. Due to these properties, there have been problems in repairing cracks, especially in cold regions.

The present invention was conceived in view of these problems, and its first objective is to improve workability by enabling simultaneous injection of a solidifying agent into multiple cracks. , Second, it is necessary to inject the hardening agent into so-called hair cracks that are invisible or often overlooked by workers. Third, the hardening agent can be injected into minute gaps deep inside the cracks and hair cracks on the surface. The goal is to ensure that this is done well.

The gist of the present invention is, firstly, to provide a method for injecting a solidifying agent into cracks using a pump into cracks that have occurred in a structure such as concrete. The surface of the object is scraped to form grooves that intersect with multiple cracks, a wire material is placed in the grooves, and the wire material is applied to the surface of the structure so as to intersect with each crack. After embedding and solidifying the sealant, the linear material is pulled out to form a solidifying agent injection path communicating with each crack, and the surface opening of each crack is covered with a sealant, and the solidifying agent injection path is Second, in the method of injecting cement into cracks using a pump to inject solidifying agent into cracks that have occurred in structures such as concrete, it is possible to The surface of the structure is scraped to form a groove, an adhesive tape is applied to the outside of the groove, and a sealant is applied to the outside of the adhesive tape to create a hardening agent injection path that communicates with each crack. At the same time, the surface opening of each crack is covered with a sealing agent, and a solidifying agent is press-fitted from the injection path.

Next, an embodiment of the present invention will be described with reference to FIG. 2 and subsequent figures.

First, as shown in FIG. 2, while applying the wire materials 1, 1... at appropriate intervals across the plurality of cracks a, a... exposed on the surface of the structure, the third
As shown in the figure and FIG. Only one end of it is exposed. As the sealant, conventionally used hot melt, quick setting cement, etc. are used.

Further, as the wire material 1, a stretchable rod-like or pipe-like material made of a vinyl-based synthetic resin material can also be 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 the sealant 2 has solidified, and as the wire material 1 is pulled out, as shown in FIG. A binder injection path 3 is formed.

In this way, the outside is covered with the sealant 2, and the solidifying agent injection channels 3, 3... which are connected to each other by crossing the plurality of cracks a, a... are sequentially formed at appropriate intervals. As shown in FIG. 6, hot air is blown from the injection path 3 through the hot air injection pipe 4. At this time, the other openings of the injection path 3 except for the part connecting the hot air injection pipe 4 and the part for exhausting the air are closed with plugs 5. As a result, the hot air sent from the pipe 4 passes through the cracks a, a, . . . from the injection path 3 to which the pipe 4 is connected, and 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. 7 and 8. .

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.

In the above embodiment, when forming the injection path 3, the surface of the structure is scraped off to form a groove 7 as shown in FIG. Alternatively, as shown in FIG. 10, a tape 8 may be attached to the surface of the groove 7, and a sealant 2 may be applied to the outside of the tape 8, so that the groove 7 can be used as a hardening agent injection path 3. Furthermore, as shown in FIG. 11, the entire surface of the structure may be flattened with a sealing agent 2, or a solidifying agent 6 may be injected without going through the hot air blowing step described above. It is.

The method of injecting a solidifying agent into cracks according to the present invention is configured as described above, in which the surface of a structure is scraped to form a groove that intersects with a plurality of cracks, and a wire material is inserted into the groove to form a groove. The linear material applied across each crack is embedded in the surface with a sealant, and after the sealant solidifies, the linear material is pulled out to form a solidifying agent injection path communicating with each crack. By covering the surface openings of each of the cracks with a sealant and press-fitting the solidifying agent through the injection path, simultaneous injection into multiple cracks becomes possible, and the installation of the injection path becomes easy. , workability has been significantly improved.

In addition, since the injection channel is installed continuously on the surface of the structure, it is also installed over the hair cracks that are invisible to the worker, and as a result, the setting agent cannot be injected into such hair cracks. This is what has become the norm.

Furthermore, in the present invention, grooves are formed by scraping the surface of the structure across a plurality of cracks, adhesive tape is applied to the outside of the grooves, and a sealant is applied to the outside of the adhesive tape to seal each crack. By forming a communicating solidifying agent injection path, covering the surface opening of each crack with a sealant, and press-fitting the solidifying agent through the injection path, not only the same effects as described above can be obtained, but also After press-fitting the solidifying agent and solidifying the solidifying agent, it is very easy and convenient to peel off the adhesive tape and level out the unevenness of the surface.

[Brief explanation of the drawing]

Fig. 1 is a plan view showing an example of a crack in a structure, Fig. 2 is a plan view of a wire material placed across the crack, and Fig. 3 is a plan view of a state in which the wire is buried and covered with a sealant. , Figure 4 is a cross-sectional view taken along the line in Figure 3,
FIG. 5 is a plan view of the state in which the solidifying agent injection path is formed;
Figure 6 is a plan view of the hot air blowing state, Figure 7 is a cross-sectional view of the solidifying agent injected state, Figure 8 is a cross-sectional view taken along the - line in Figure 7, and Figures 9 to 11 are of the injection path. FIG. 7 is a cross-sectional view showing another example of the attachment method. a...Crack, 1...Wire material, 2...Sealant,
3... Solidifying agent injection path, 4... Hot air injection pipe, 5
...Plug, 6...Cagulating agent, 7...Groove, 8...Tape.

Claims (1)

[Claims] 1. In a method of injecting a solidifying agent into cracks in a structure such as concrete using a pump, the surface of the structure is scraped to form multiple cracks. A wire material is placed in the groove to form a groove, and the wire material is applied to the surface of the structure so as to intersect each crack, and the wire material is embedded with a sealant, and after the sealant solidifies. Pulling out the wire material to form a solidifying agent injection path communicating with each crack, and covering the surface opening of each crack with a sealant,
A method for injecting a solidifying agent into a crack, which comprises pressurizing the solidifying agent through the injection path. 2 In the method of injecting cement into cracks using a pump into cracks that occur in structures such as concrete, grooves are created by scraping the surface of the structure across multiple cracks. , apply adhesive tape to the outside of the groove, and apply a sealant to the outside of the adhesive tape to form a hardening agent injection path communicating with each crack, and seal the surface opening of each crack. 1. A method for injecting a solidifying agent into a crack, the method comprising: coating the crack with a hardening agent, and press-fitting the solidifying agent into the crack through the injection path.