JP3032035B2 - Crack injection method and device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for injecting a water-stopping agent into cracks for repairing water leakage from fine cracks generated on crack-injected surfaces such as underground concrete structures.

[0002]

2. Description of the Related Art Old underground concrete structures such as road tunnels, subways, underground shopping malls, and underground passages are increasing year by year with the development of underground spaces. In general, underground structures are generally constructed below the groundwater level, and there is a problem of leakage of groundwater as a problem in maintenance of old underground structures. This water leakage is due to the occurrence of cracks and the like in the concrete of the underground structure. The causes of the cracks include excessive stress cracks, neutralization of concrete, alkali-aggregate reaction, and the effect of acids in the groundwater. Deterioration due to earthquakes and abnormal external forces due to earthquakes and the like. The above-mentioned water leakage cracks can be avoided to some extent due to reduction of generated stress or consideration of concrete mixing at the time of designing and constructing a concrete structure, but they cannot be completely prevented from occurring. Therefore, development of an effective crack repair method is finally desired.

Heretofore, a V-cut crack injection method can be cited as the most common crack repairing method for water stoppage in concrete structures such as underground structures. ◇ In the V-cut crack injection method, as shown in FIGS. 6 and 7, a V-cut 55 is applied along the water-leak crack 52 generated in the concrete 50, and then the water-leak crack 52 is injected into the water-leak crack 52. Injection tube 5
6 are attached at a predetermined interval, and the V cut 55 is sealed with a waterproof cement 57 made of quick setting cement or the like. This is a method of performing injection by a method of construction or the like.

On the other hand, in recent years, various improvements have also been made in the crack injection method, and some new methods have become known. For example, among known improvement methods, there is a low-pressure crack injection method called a squeeze method. This method is
Conventionally, a liquid agent injected at a high pressure tends to run linearly in a place where crack resistance is low, and in view of problems such as insufficient injection into a portion that is difficult to penetrate, it is an invention made, Specifically, as shown in FIG. 8, a ring-shaped squeeze plate 61 in which a rubber film 62 of, for example, natural rubber or silicon rubber is fixed in a frame is fixed on a crack 64 with a putty 63, and the rubber film 62 is formed. The rubber coating 62 is inflated into a balloon shape while injecting the injected resin into the inside, and the resin is injected to every corner of the crack 64 by utilizing the restoring force and the capillary phenomenon of the rubber coating 62.

[0005]

Generally, cracks generated in concrete structures and the like have different water leakage conditions depending on the nature of the cracks. In other words, when the crack width is relatively large, the leakage point is clear,
It is easy to limit the crack injection target location, and a sufficient water stopping effect can be expected even by the V-cut crack injection method described above. However, in the case where a large number of fine cracks are planarly generated, for example, in a turtle shape, The water leakage may ooze out from the entire surface where the crack has occurred, so that the injection site cannot be limited. In such a case, the above-described V-cut crack injection method is difficult and sufficient. The water stopping effect cannot be expected. In addition, in the case of the squeeze method described above, for fine cracks, even if some effective crack injection can be expected, since the injection pressure of the injected resin uses the restoring force of the rubber film, it may be high. The injection pressure can be set only to about 0.5 kgf / cm ² , and it is difficult to prevent water leakage.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention relates to water stopping of cracks and the like generated in underground structures and the like. In particular, an effective water stopping effect can be expected for fine cracks and crack injection can be performed efficiently. Methods and apparatus are provided.

[0007]

An object of the present invention is to provide a method for injecting a water-blocking agent into leaking fine cracks when water leaks from the entire surface where a plurality of fine cracks are generated. The packing body holding means, which is mechanically fixed to the crack injection target surface, is used as a seat, and the opposing surface portion facing the leaking fine crack and a ridge protruding from the peripheral portion of the opposing surface portion. A closed space is formed between the leaking fine cracks by holding the packing body having a pressure state, and a pressurizing agent is supplied to the closed space at a pressure equal to or higher than the water leakage pressure. This can be solved by a crack injection method characterized in that the inside of the water stopping agent is kept in a pressurized state equal to or higher than the leak pressure until the usable time of the water stopping agent elapses.

[0008] Further, the device is a device for injecting a water-stopping agent into the leaking fine cracks when the leaking water leaks from the entire surface on which the plurality of fine cracks are generated. Packing having an opposing surface portion facing the micro-crack that is formed and projecting from the periphery of the opposing surface portion to form a closed space between the micro-crack and the leaking water. Body, packing body holding means mechanically fixed to the surface to be injected with cracks, and a packing body holding means for holding the packing body in a pressed state with respect to the surface to be injected with cracks, and a stopper in a closed space formed by the packing body. A water stoppage for supplying a liquid agent at a pressure equal to or higher than the water leak pressure and maintaining the water stop agent in the closed space under a pressure equal to or higher than the water leak pressure until the pot life of the water stop agent elapses. Drug delivery And it is made of a pressure retaining means.

Further, the pressing force of the packing body against the crack injection target surface can be adjusted freely, and the pressing and holding of the packing body by the packing body holding means is made to be one point at the center of the packing body. It becomes suitable.

[0010]

According to the present invention, in connection with the crack injection operation,
Concrete, the packing body holding means is mechanically fixed to a crack injection target surface such as a mortar surface with a bolt or the like after drilling, and the packing body holding means is held in a pressed state against the crack injection target surface by the packing body holding means. Compared with chemical means by curing of an adhesive or the like, secure fixing can be achieved, and rapid construction can be expected without having to wait for the curing time to elapse.

The packing body has an opposing surface portion facing a leaking fine crack (hereinafter, also simply referred to as a crack), and a ridge is projected around a peripheral portion of the opposing surface portion. By being held in a pressed state by the body holding means, a closed space having a good sealing property is formed between the convex cracks and the minute cracks leaking water. Furthermore, by making the pressing force of the packing body adjustable, when the water-stopping agent is pressurized and supplied at a predetermined pressure, if there is a leak from the gap of the packing body, the pressing force is increased and the injection is performed. The leakage of the agent can be eliminated. Further, by pressing the central portion of the surface of the packing body at one point to maintain the pressed state of the packing body, the packing body can be maintained in a uniformly pressed state. The shape of the facing surface portion of the packing body is not limited at all, and may be an appropriate surface shape such as a flat surface or a concave surface. In the present invention, since the pouring operation can be performed with the above-described action, it is possible to effectively stop water leakage from fine cracks.

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail based on specific examples with reference to the drawings. FIG. 1 is a plan view of the crack injection device according to the present invention, and FIG. 2 is a view taken along line 2-2 of FIG.
FIG. 3 is a view taken along line 3-3 of FIG. The crack injection device according to the present invention includes a packing body holder 1 mainly fixedly attached to the concrete W, a packing body 2 for forming a closed space P between the packing body and the concrete surface, A waterproofing agent supply device 3 for pressurizingly supplying the waterproofing agent to the closed space.

The packing body holder 1 is composed of a horizontal member 10 that straddles a crack occurrence site and a screw jack 11 that is a pressing means of the packing body 2. The horizontal member 10 is formed into a cross shape in a plane by a steel plate 10c, and the steel plate 10c is used as a reinforcing member.
d is erected along the edge of the steel plate 10c, and as shown in FIG. 3, a seat 10a for fixing to the concrete W is further formed to form a hat-shaped cross-sectional shape. In this specific example, as described above, the shape is a cross in a plan view, but the present invention is not limited to this, and may be simply formed into a single character. Further, as shown in FIG. 4, the holders 1 ', 1',... Having the edges of the packing body 2 'as supporting points without traversing the packing body 2'.
It may be that. As shown in FIG. 2, a fitting ring 10b is provided at the center of the horizontal member 10, and the screw jack is inserted into a screw groove hole 10e formed on the inner diameter side of the fitting ring 10b. 11 is screwed and penetrated. The screw jack 11 has a screw portion 1
1a and a handle 11b for the rotation of the screw 1a. The tip of the threaded portion 11a fits into the hole 24 of the packing body 2, and the fluid in the hole 24 is sealed by an O-ring 13 provided on the outer periphery of the tip. A Bourdon tube pressure gauge 12 is provided at the head of the screw portion 11a, and communicates with the hole portion 24 through a passage 11c formed inside the screw portion 11a. The pressing force of the packing body 2 can be measured by sensing an increase or decrease in the internal pressure of the part 24. When mounting the packing body holder 1, an anchor bolt 4 having a threaded head is used.
Is embedded in the concrete W in advance, and the anchor bolt 4 is passed through the through hole of the seat 10 a of the packing body holder 1 and fastened by the nut 5.

On the other hand, as shown in detail in FIG. 2, the packing body 2 comprises a pressing plate 20 disposed on the outside and a packing plate 21 disposed on the concrete W surface side. Concave and convex engagements are formed on the close contact surfaces of the pressing plate 20 and the packing plate 21 so that they are not easily displaced. In this specific example, the packing body 2 is constituted by the pressing plate 20 and the packing plate 21 as described above, but may be constituted integrally by a single member. Concrete W of the packing plate 21
A seal packing 22 made of, for example, synthetic rubber as an elastic ridge that closes in an annular shape is provided along the edge of the opposite surface, and the packing body 2 is attached to the concrete W surface by the screw jack 11. As a result, a closed space P is formed on the surface of the concrete W. As shown in the figure, the seal packing 22 may be of any suitable shape, such as a rectangular cross-section, a circular cross-section, a V-shape, and a W-shape with two tongues. The seal packing 22 is preferably an elastic body such as natural rubber or synthetic rubber.

[0015] Leather, asbestos, clay, soft synthetic resin, lead or the like can also be used. Further, the thickness of the closed space P is within 20 mm, preferably within 10 mm.
The pressure plate 20 may be, for example, a normal steel material, but the packing plate 21 is in direct contact with the water stopping agent, so that the cured product is easily peeled off. It is preferable to use various kinds of synthetic resins. Further, a water-stopping agent supply passage 21a for supplying a water-stopping agent is formed in the packing plate 21 so that the water-stopping agent is supplied by a water-stopping agent supply pipe 6 connected via an adapter 23. It has become.

On the other hand, the water-stopping agent supply device 3 for pressurizing and supplying the water-stopping agent through the water-stopping agent supply pipe 6 is provided on the bottom end surface of the transparent cylindrical body 31. A bottom lid 33 to which the liquid medication supply pipe 6 is connected is attached, and an upper lid 32 provided with a waterproofing agent supply port 32a, an air supply port 32b, and a pressure gauge 37 is attached to an upper end surface thereof.
The bottom cover 33 and the top cover 32 are connected by connecting bolts 34, 34,. At the time of injection of the water-stopping agent, the water-stopping agent supplied to the cylindrical body portion 31 is extruded by the pressurized air supplied from the air supply port 32b, and is inserted into the closed space P through the water-stopping agent supply pipe 6. To pump. Further, the water-stopping agent supply device 3 functions as a pressure holding device for holding the water-stopping agent supplied to the closed space P in a pressurized state.

In the crack injection operation using such a crack injection device, first, preferably, the seal packing 2 of the packing plate 21 at the crack occurrence site is used.
In addition to performing unevenness adjustment (Keren) near the abutment part of 2,
After the anchor bolts 4 for fixing the packing body holder 1 to the concrete W are buried in the concrete W, the packing body holder 1 and the packing body holder 1 are attached thereto. In addition, in the case where there are a plurality of crack injection target locations, the work can be performed if the anchoring bolts 4 are buried in the respective locations and the packing body 2 and the packing body holder 1 are attached prior to the injection work. It can be done efficiently.

After such work, the screw jack 11
The screw jack 11 is screwed in the direction of pressing the packing body by rotating the handle portion 11b, and the packing body 2 is pressed and held against the concrete W surface. Supply.

At the time of pressurized supply of the water-stopping agent, a water-stopping agent is supplied to the cylindrical body 31 from the water-stopping agent supply port 32a, and an on-off valve 35 provided in the communication passage of the water-stopping agent supply port 32a. Is closed, and then pressurized air is supplied from an air supply port 32b by an air compressor or the like, and the water stopping agent in the cylindrical body 31 is sent to the closed space P formed by the packing body 2, and compressed air is supplied. The supply valve 36 is closed to maintain the supplied water stopping agent in a predetermined pressurized state.

The injection pressure of the supplied water-stopping agent is not less than the water leakage pressure, and when the potable time of the water-stopping agent (time during which injection can be used) elapses, pressurization is stopped, and the packing body 2 and the packing body holding are held. The fixture 1 is removed, the concrete surface is finished, and the water stopping operation is completed.

By the way, the crack injection device according to the present invention may use any pressurizing source. For example, as shown in FIG. An injection can also be performed. In FIG. 5, pressurized air sent from an air compressor 40 through an air reservoir 41 is sent to each crack injection device via a pressure reducing valve 42, 42. As described above, when a plurality of injection points are performed in parallel, the permeability of the water-stopping agent generally varies depending on the injection points. There is a tendency that the injection tends to be carried out only to the portion, and the phenomenon that almost no injection is made to the portion having poor permeability may occur. To solve this problem, for example, as disclosed in JP-A-63-63661, when the water-stopping agent pressure exceeds a predetermined pressure at each crack injection site, the water-stopping agent is discharged from the injection site. By combining flow paths provided with a pressure adjusting mechanism, uniform crack injection can be achieved.

The water-blocking agent used in the present invention is not particularly limited, and may be a cement, a water glass, an epoxy, a urethane, an acrylamide, or a urea which is usually used for crack injection. Curable polymers such as aldehyde condensates can be used.

[0023]

As described above, according to the present invention, the crack injection work can be made more efficient. In particular, it is effective when stopping water leakage from fine cracks.

[Brief description of the drawings]

FIG. 1 is a plan view of a crack injection device according to the present invention.

FIG. 2 is a view taken along line 2-2 of FIG. 1;

FIG. 3 is a view taken along line 3-3 of FIG. 1;

FIG. 4 is a plan view of another example of the crack injection device according to the present invention.

FIG. 5 is a schematic system diagram when crack injection at a plurality of locations is performed in parallel.

FIG. 6 is a view of a conventional crack injection repair from the front of concrete.

FIG. 7 is a longitudinal sectional view of a conventional crack injection repair.

FIG. 8: Known improved crack injection method (squeeze method)
FIG.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Packing body holding | maintenance, 2 ... Packing body, 3 ... Waterproofing agent supply apparatus, 4 ... Anchor bolt, 6 ... Waterproofing agent supply pipe,
11 screw jack, 12 pressure gauge, 20 pressure plate, 21 packing plate, W concrete

Continuation of front page (58) Field surveyed (Int.Cl. ⁷ , DB name) E04G 23/02

Claims (4)

(57) [Claims] 1. A method for injecting a water-stopping agent into leaking fine cracks when water leaks from the entire surface where a plurality of fine cracks are generated. A packing body having an opposing surface portion facing the leaking fine cracks and a ridge protruding from a periphery of the opposing surface portion is pressed against the packing body holding means, which is mechanically and fixedly fixed, as a seat. To form a closed space between the leaking fine cracks and a pressurized water supply to the closed space at a pressure equal to or higher than the water leak pressure, and to apply the water stopping agent in the closed space to the water leak pressure. A method for injecting a crack, wherein the pressurized state is maintained until the pot life of the water stopping agent has elapsed. 2. An apparatus for injecting a water-stopping agent into leaking fine cracks when water leaks from the entire surface on which a plurality of fine cracks are generated, wherein the leaking fine cracks are provided. A packing body having a facing surface facing the crack and forming a space closed between the leaking fine cracks and a ridge protruding around the periphery of the facing surface; Packing body holding means mechanically fixed to the surface to be injected with cracks and holding the packing body in a pressed state against the surface to be injected with cracks; leaking a water stopping agent into a closed space formed by the packing body A pressurizing supply at a pressure equal to or higher than a pressure, and a pressurizing agent supply and pressure for maintaining the water stopping agent in the closed space in a pressurized state equal to or higher than a leak pressure until the usable time of the water stopping agent elapses. Retention Crack injection apparatus characterized by comprising a stage. 3. The crack injection device according to claim 2, wherein the pressing force of the packing body against the crack injection target surface is adjustable. 4. The crack injection device according to claim 2, wherein the holding of the packing body by the packing body holding means is performed at one point at the center of the packing body.