JPH0657965A - Cut-off method of structure and cut-off device - Google Patents

Abstract

PURPOSE:To obviate the complicated and troublesome operation, reduce the material costs and personnel expenses and greatly shorten the working hours. CONSTITUTION:A long ditch is excavated along water leaking places of a concrete structure surface 1, and the surface of a contact plate unit 10 of chemical stability jellied synthetic rubber formed of a reinforced plate 5 of a longer rigid body loaded to the rear is pushed. A plurality of them are arranged in series to push, and the end of the other contact plate unit 10 linked with the end of one contact plate unit 10 in series is stably pushed from the upper part by a contact plate unit anchoring body 6 to inject hydrophilic one-liquid type polyurethane prepolymer into the longer ditch 3 from a hydrophilic one-liquid type polyurethane prepolymer injection hole 7. At the same time, air in the longer ditch 3 is exhausted from an air-hole 8, and after that, the polymer injection hole and air-hole are closed up to leave them alone.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waterproofing method for a concrete structure and a waterproofing tool.

[0001]

2. Description of the Related Art In the conventional water-stopping method using a hydrophilic one-component polyurethane prepolymer water-stopping method, a groove is dug in a cracked and leaky surface of a concrete structure. After making a waterproof groove injection pocket with a long groove and sealing the surface of the pocket, a hydrophilic one-pack type polyurethane prepolymer (hydrolysis type urethane resin prepolymer) is injected into the pocket and sealed.

Specifically, first, an electric cutter blade is pressed against the concrete surface to cut two strips in parallel to each other with a width of about 40 mm and a depth of about 5 mm, and then a groove is cut to a depth of about 40 mm between the two slits. Dig. Next, a plastic mesh hose is laid on the bottom of the finished long groove (pocket), the surface thereof is sealed with gum tape, and a quick-setting cement is built up on the surface and hardened and sealed.
At that time, aluminum pipes (for example, a diameter of 6 mm and a length of 100 mm) for injecting the waterproofing agent and for bleeding the air are separately provided upright on the long groove. After that, water is first injected from the opening of the aluminum pipe for waterproofing agent to make the inside of the groove moistened with water, then hydrophilic one-component polyurethane prepolymer is injected, and both aluminum pipe ends are filled. Seal the part. Then, the hydrophilic one-pack type polyurethane prepolymer foams while generating a carbon dioxide gas by reacting with the water in the groove or the water leak in the concrete structure, and the pressure (4-5
(kg / cm ² ), the hydrophilic one-pack type polyurethane prepolymer penetrates deep into the leakage channel, where it further reacts with water and foams and hardens, resulting in cracks and bubbles at the leakage point in the concrete structure. It closes all voids and restores water tightness. The above work is
The work of cutting and sharpening (harvesting) on the concrete surface was required, and the sealing with quick-setting cement mortar required a high level of technology and required a long time. Therefore, labor cost (labor cost) and material cost (mesh hose, gum tape, aluminum pipe, 4k per 1m of quick-setting cement)
The cost including g) was high.

[0003]

Means for Solving the Problems As a result of earnest research to solve the above-mentioned problems, the present inventor has found that cracks on the surface of concrete structures and leaked water from concrete joints can be cut along with them with an electric cutter or the like. U cut (width 10m
m, depth of about 10 mm (however, it depends on the thickness of the skeleton), and after forming a long groove with a U-shaped cross section, the surface of a concrete-like yokan type rubber whose back is not bent is attached to the surface of the concrete structure along the long groove. By pressing and following even the uneven surface of the concrete structure and completely adhering it, by injecting the same prepolymer from the hydrophilic one-pack type polyurethane prepolymer injection hole formed in the yokan-shaped silicone rubber, A method for injecting the hydrophilic one-pack type polyurethane prepolymer so as not to leak from the surface of the concrete structure was devised.

That is, the present invention includes (1) a first step of forming a long groove along a water leakage point on a concrete structure surface;
Along the long groove of the concrete structure surface, press the surface of the chemically stable yokan-like synthetic rubber touch plate unit that has a hydrophilic one-component polyurethane prepolymer injection hole at one end and an air vent hole at the other end. The second step of stably pressing the end portion of the contact plate unit from above with a fixing member of the contact plate unit composed of a rigid pressing plate, and the same polymer from the hydrophilic one-component polyurethane prepolymer injection hole of the contact plate unit. Is injected into the long groove of the concrete structure surface, and at the same time, the air in the long groove is discharged from the air vent hole of the plate unit, and then a fourth step of sealing both holes and leaving them to stand. A method of waterproofing a concrete structure, characterized in that (2) a bottom portion of a long rigid body having an inverted T-shaped cross section, and a hydrophilic one-pack type polyurethane prepolymer injection hole at one end, A plate unit mounted on the back of a chemically stable yokan-like synthetic rubber having an air vent hole at the end, and a deep groove for fitting and holding the inverted protrusion of the inverted T-shaped long section rigid suspension in the center. And a plate unit fixing body having wings having L-shaped grooves for fixing to a concrete structure on both sides, for use in carrying out the waterproofing method according to (1) above. It is a waterproofing tool for concrete structures.

In the above, the chemically stable yokan-like synthetic rubber (for example, silicone rubber) is provided with a long rigid reinforcing plate on the back, and for example, the bottom of the long rigid body having an inverted T-shaped cross section is chemically stable yokan. It is preferable that the synthetic rubber be attached to the back of the synthetic rubber, and even if the concrete concrete has fine irregularities, it can follow the irregularities and make close contact. Further, by providing long through holes on the left and right sides of the yokan-like synthetic rubber, the flexibility of the surface portion is increased, so that even the rough surface of the concrete structure can be brought into close contact without forming a gap. be able to. Further, it is preferable that the fixing unit of the contact plate unit, which is made of a rigid pressing plate, is provided with an L-shaped groove into which an anchor bolt is inserted and attached on a side portion thereof. Further, in order to uniformly transmit the pressing force to the surface portion of the yokan-like synthetic rubber contact plate, it is preferable that the long rigid plate has ribs on its back, for example, a substantially inverted T-shaped cross section. It is also preferable that a long groove of the mold is formed in the back of the yokan-shaped synthetic rubber plate, and a long rigid body (for example, made of steel) having an inverted T-shaped cross section is inserted therein. The chemically stable yokan-like synthetic rubber is preferably a flexible elastic body that does not react with a hydrophilic one-pack type polyurethane prepolymer such as silicone rubber or fluororubber, and these are flexible after water-stop treatment. It can be removed and reused any number of times.

In the above, the fixing unit for the plate unit having the deep groove for fitting and holding the protruding portion of the elongated rigid body having the inverted T-shaped cross section in the central portion and having the blade portions on both sides is fixed to both the blade portions. It is preferable to provide a small hole or a through groove so that it can be easily attached to a support body such as an anchor bolt attached to the surface layer of the concrete structure for pressure fastening. The fixing small holes can be used for various planting positions of anchor bolts.
It is also preferable to dispose a plurality of adjacent holes, and the through-grooves may be horizontally elongated or bent further so as to correspond to various anchoring positions of the anchor bolts, or a plurality of them may be provided. You may provide in proximity.

[0007]

Embodiments of the present invention will now be described with reference to the drawings. FIG. 1 is a cross-sectional reverse T used in the embodiment of the present invention.
Partially cutaway perspective view of a yokan-shaped synthetic rubber patch unit with a long rigid R-shaped body attached to the back. Fig. 2 shows that the yokan-shaped synthetic rubber patch unit is pressed at its ends or pressed together to connect. FIG. 3 is a perspective view of a contact plate unit fixing body for use in FIG. 3, and FIG. 3 is a front view of a state in which the yokan-shaped synthetic rubber contact plate unit of FIG. 1 and the contact plate unit fixing body of FIG. FIG. 4 is a sectional view taken along line AA of FIG.

The working state of the water stopping method of this embodiment will be described below in order. (1) First, in FIG. 3, a plurality of the contact plate units 10 shown in FIG. 1 are temporarily placed in series along the cracked surface of the concrete structure surface 1 and trimmed with a marker. (2) Next, as shown in FIG. 3, the fixing plate unit fixing body 6 is temporarily placed on the end portion of the pressing plate unit 10, the anchor bolt planting positions are marked, and they are removed. (3) Therefore, 30 mm from both ends of the contact plate unit 10
Using an electric cutter, one surface of the concrete structure during the return is cut into a long groove 3 having a U-shaped cross section with a width of 10 mm and a depth of 10 mm as shown in FIG. Since the width and the depth of the long groove 3 need to be changed depending on the thickness of the skeleton and the like, the above dimensions are only one example. (4) Further, the marking portion for anchor bolt planting is bored and the anchor bolt 9 is planted. In addition, the surface is sealed by filling quick-setting cement, underwater bond, or the like in the recesses or cracked portions that are cut out and cut out except the long groove 3 for injecting the waterproofing material.

(5) Then, the contact plate unit 10 is pressed against the surface of the concrete structure 1 along the long groove 3, and further, the contact plate unit is placed on the long rigid body 5 having an inverted T-shaped cross section at the back of the end thereof. By inserting the deep groove 6a portion of the fixing body 6, inserting the anchor bolt 9 into the fixing small hole 6b at the same time, and tightening with the nut 9a, the lower surface of the silicone rubber contact plate 4 of the contact plate unit 10 is uniformly made of a concrete structure. Thing 1
Make a close contact with the surface. (6) Next, water is injected into the long groove 3 through the injection pipe 7a inserted into the hydrophilic one-liquid type polyurethane prepolymer injection hole 7 formed in the plate unit 10. At this time, the silicone rubber contact plate 4 and the concrete structure 1
Check and adjust so that water does not flow out between the surfaces. (7) After about 30 minutes have passed since the injection of water was stopped, "NL paste" was introduced from the injection pipe 7a at the lowermost end or the lower end (trade name: hydrophilic one-component polyurethane manufactured by Takeda Pharmaceutical Co., Ltd.). (Prepolymer) is injected into the long groove 3, and when the NL paste flows out from the air vent pipe 8a of the air vent hole 8 at the other end, the injection hole 7 and the air vent hole 8 are plugged.

(8) The above steps are sequentially repeated along the cracked portion of the surface of the concrete structure. (9) Then, after leaving for 12 to 24 hours, the contact plate unit fixing body 6, the contact plate unit 10, and the anchor bolt 9 are removed, and the surface finishing is performed by filling the anchor bolt planting hole with quick setting cement.

Generally, when the anchor bolt 9 is planted, if the reinforcing bar is buried at a required position on the surface of the concrete structure, the reinforcing bar becomes an obstacle.
The situation arises where it is necessary to shift the position and plant.
Therefore, if a large number of fixing small holes 6b provided in the wing portion of the plate unit fixing body 6 in the above-described embodiment are provided in close proximity to each other, even if the anchor bolt 9 is displaced a little. By selecting and inserting an appropriate small hole, the fixing can be performed properly. In addition, as shown in FIG.
If the fixing groove 6b 'is provided in the L-shape, the anchor bolt 9 located at an appropriate position of the L-shape groove is inserted,
Can be fixed. Furthermore, silicone rubber plate 4
Since the long through holes 4a, one left and one right, are formed in both side portions of the silicone rubber, the surface portion of the silicone rubber contact plate 4 has increased flexibility and adheres well to a considerably rough uneven surface, No gap was formed between the concrete structure and one surface.

[0012]

As described above, according to the present invention, As in the conventional technology, complicated and labor-intensive operations such as laying a plastic mesh hose on the bottom of the long groove (pocket), sealing the surface with gum tape, and laying quick-setting cement on the surface and hardening and sealing are performed. It becomes unnecessary, material cost and labor cost can be reduced, and working time can be greatly reduced. ． The finishing process after the water-stopping agent injection process is also easy, and the concrete structure can be water-stopped cleanly in a short time. ． Since the yokan-like synthetic rubber plate is chemically stable such as silicone rubber, it can be spun off after water-stop treatment and reused any number of times, and the cost can be greatly reduced. ． Further, according to the method of the present invention in which a long groove is formed by using an electric cutter or the like, it is possible to easily form a long groove in a short time without the need for a chipping work which was very difficult and took a long time in the conventional method. You can

[Brief description of drawings]

FIG. 1 is a partially cutaway perspective view of a cannibal-shaped synthetic rubber hitting plate unit in which a long rigid body having an inverted T-shaped cross section used in an embodiment of the present invention is attached to a back portion;

FIG. 2 is a perspective view of a contact plate unit fixing member for pressing and connecting the yokan-shaped synthetic rubber contact plates at their ends.

FIG. 3 is a front view showing a state where the yokan-shaped synthetic rubber contact plate unit of FIG. 1 and the contact plate unit fixing member of FIG. 2 are arranged in series on the concrete structure surface;

4 is a sectional view taken along line AA of FIG.

[Explanation of symbols]

 1: Concrete structure 2: Cracked 3: Long groove 4: Silicone rubber plate 4a: Long through hole 5: Reverse T-shaped cross section rigid body 6: Plate unit fixing body 6a: Deep groove 6b: Small hole for fixing 6b ': L-shaped groove for fixing 7: Hydrophilic one-component polyurethane prepolymer injection hole 7a: Injection pipe 8: Air vent hole 8a: Air vent pipe 9: Anchor bolt 9a: Nut 10: Plate unit

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Matsubayashi Matsuju 3-11-6 Konan, Naka-ku, Hiroshima City, Hiroshima Prefecture (72) Inventor Shoji Saito 5-2-4-512 Prince, Kita-ku, Tokyo (72) Invention Hiroshi Miura 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Construction Co., Ltd. (72) Inventor Tadashi Ishikawa 1-3-2 Shibaura, Minato-ku, Tokyo Shimizu Construction Co., Ltd. (72) Inventor Tadashi Ono Tokyo Shimizuura 1-3-2 Shibaura, Minato-ku, Shimizu Corporation (72) Inventor Yukimasa Kikuchi 1-6-4-103 Kizawa, Toda City, Saitama Prefecture (72) Tamio Maki, 3-8 Hinode, Honjo City, Saitama Prefecture -24-409 (72) Inventor Machii Politics 30-10 Futaba-cho, Itabashi-ku, Tokyo (72) Inventor Naoyuki Nakayama 3-37-12 Kitanodai, Hachioji City, Tokyo (72) Inventor Shuichi Moriyama Kamifukuoka City, Saitama Prefecture 1-4-13 Kamifukuoka

Claims (5)

[Claims] 1. A first step of forming a long groove along a water leakage point on a concrete structure surface, and a hydrophilic one-pack type polyurethane prepolymer injection hole at one end along the long groove on the concrete structure surface. The surface of a chemically stable yokan-like synthetic rubber pressing plate unit having an air vent hole at the other end is pressed, and the end part of the pressing plate unit is stably fixed from above by a pressing plate fixing unit composed of a rigid pressing plate. In the second step of pressing and injecting the same polymer into the long groove of the concrete structure surface from the hydrophilic one-component polyurethane prepolymer injection hole of the contact plate unit, at the same time, from the air vent hole of the contact plate unit into the long groove. A method of waterproofing a concrete structure, comprising a third step of discharging the air and a fourth step of thereafter sealing both holes and leaving them to stand. 2. The concrete structure according to claim 1, wherein the chemically stable yokan-like synthetic rubber contact plate unit has a long rigid reinforcing plate attached to the back thereof. Water stop method. 3. The fixing plate fixing member, which is a rigid pressing plate, is provided with an L-shaped groove into which an anchor bolt is inserted and mounted on a side portion thereof. Water stop method for concrete structures. 4. A long groove is formed by U with an electric cutter or the like.
The method for waterproofing a concrete structure according to claim 1, wherein the method is performed by cutting work. 5. A chemically stable yokan-like synthesis having a bottom of a long rigid body having an inverted T-shaped cross section, a hydrophilic one-pack type polyurethane prepolymer injection hole at one end, and an air vent hole at the other end. A plate unit mounted on the back of the rubber, and a deep groove for fitting and holding the inverted protrusion of the T-shaped long rigid body having the inverted cross section in the center, and for fixing to the concrete structure on both sides. A waterproofing tool for a concrete structure for use in carrying out the waterproofing method according to any one of claims 1 to 4, which comprises a contact plate unit fixing body having a wing portion having an L-shaped groove.