JP2002317561A - Wall surface repairing method and wall surface repairing gun - Google Patents

Abstract

PROBLEM TO BE SOLVED: To develop a wall surface repairing method which allows effective injection of a wall surface grouting/repairing material even into microcracks, the injection of the material into the microcracks having been impossible by a conventional method. SOLUTION: The wall surface repairing method is carried out by inserting a repairing member (40) into a portion (h) of a wall surface (H) to be repaired, connecting a wall surface repairing gun (A) to the repairing member (40), and press-fitting the wall surface grouting/repairing material (J) into the portion (h) of the wall surface (H) to be repaired. According to the method, the wall surface repairing gun (A) is oscillated, and while the wall surface grouting/ repairing material (J) is subjected to oscillation in an injecting direction, the wall surface grouting/ repairing material (J) is press-fitted into the portion (h) of the wall surface (H) to be repaired.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method for repairing a wall surface capable of effectively injecting a repair material into a crack generated in a concrete structure such as a building or a sewer, a breakwater, a sabo dam, a pier, and the like. Related to wall repair guns.

[0002]

2. Description of the Related Art In recent years, cracks have occurred in the above-mentioned various concrete buildings, such as aging buildings constructed 20 to 30 years ago, causing various problems.
For example, if a crack on the wall is left as it is, acid rainwater will enter the inside of the crack and corrode the reinforcing steel, thereby accelerating the aging of concrete structures and causing partial collapse of concrete. Therefore, the manager of the aging concrete building needs to carry out the repair work on a regular basis.

[0003] In the maintenance of such a concrete building, it is important that (a) it is confirmed that the wall-injection repair material is injected into every corner of the crack, and that the crack is surely closed. (B) that the moisture present inside the crack does not hinder the hardening / adhesion effect of the wall-injected repair material, (c) that it can reliably fill even micro cracks branched inside, (d) ) It is required that the penetration of water into the cracked part after the repair is approximately the same as that of the part without cracks. However, with the conventional maintenance method, the filling of the wall-injected repair material is possible to some extent for large or medium cracks, but the filling of the wall-injected repair material tends to be insufficient for small to fine cracks. . In addition, when water is present in the crack, the adhesion and obstruction of the wall-injected repair material is hindered, and insufficient filling of such small to fine cracks cannot completely prevent rainwater intrusion. The effect of the repair was only limited.

[0004] The insufficient filling and hardening of the repair material for wall injection in the above-mentioned micro-cracks is presumed to be due to the following effects according to the studies of the inventors. (a)
There are various types of wall-injected repair materials, but when they are injected from small to fine cracks, the surface tension of the wall-injected repair material makes it difficult for the wall-injected repair material to penetrate into the microcracks. (B) In addition, hardening or adhesion inhibition of the wall-injected repair material due to the presence of moisture in the crack, (c)
It is considered that the reason is that the component of the wall-injection repair material has a large particle size and is hard to enter into a fine crack.

[0005]

The problem to be solved by the present invention is as follows.
It is an object of the present invention to develop a wall repair method capable of effectively injecting a wall repair material into a micro-crack that cannot be injected conventionally, and a wall repair gun for performing the method.

[0006]

Means for Solving the Problems "Claim 1" refers to "wall surface".
Insert the repair member (40) into the repair part (h) of (H), connect the wall repair gun (A) to the repair member (40), and replace the wall injection material (J) with the wall (H). This is a method of repairing the wall surface by press-fitting into the repaired part (h) of the above, which generates vibration in the wall repair gun (A) and applies vibration to the wall injection repair material (J) in the direction of injection. (J) is pressed into the repaired part (h) of the wall (H). "

According to this method, vibration is applied to the wall-injection repair material (J) in the direction of injection, so that the surface tension at the tip of the material is destroyed, and fine cracks which have been considered impossible in the past are considered.
The wall-injection repair material (J) is easily pushed into the (repair portion (h)), and the degree of completion of the wall repair can be increased. In addition,
The vibration applied to the wall-injection repair material (J) is 5,000 Hz to 20,000 H in order to effectively perform the surface tension breaking.
z is preferred.

[0008] Claim 2 relates to a wall repair gun (A) for carrying out the method described in Claim 1, wherein "the wall injection repair material (J) is replaced by a repair portion (h) of the wall (H)." Injection member to inject into
A piston (3) which is attached to the tip and pushes out the wall injection repair material (J) housed through the injection member (60).
A wall repair gun (A) having
(J) A vibration generator (4) for generating vibration in the injection direction is provided. " The vibration generator (4),
Any of a mechanical type using air pressure and an electric type using an electromagnetic solenoid, which will be described later, may be used, but a type that can realize the above-described vibration frequency is preferable.

Claim 3 is a specific example of the vibration generator (4) of the wall repair gun (A) according to Claim 2, wherein the vibration generator (4) is a wall injection repair material (J). ), And a vibration generating piston body (31) disposed reciprocally in the vibration generating cylinder (30).
a).

[0010] Claim 4 is a further specific example of the vibration generating device (4) according to Claim 3.
A compressed air inlet (33) and a compressed air outlet (34) are provided on the outer peripheral surface of the compressed air inlet (33) and the compressed air inlet (33) and the compressed air outlet (34). 33a) (33
b) and the compressed air outlet openings (34a) (34b)
The piston (31a), which is open to the inner peripheral surface of the piston (31) and constitutes the vibration generating piston member (31), reciprocates in the vibration generating cylinder (30). Operating grooves (36a) (36b) alternately connected to the compressed air inlet openings (33a) (33b), and the operating grooves (3
6a) An end opening (37a) (37b) opening from the (36b) to the end of the piston body (31a) and an outer peripheral surface of the end of the piston body (31a), the piston body (31a) generates vibration. When reciprocating in the cylinder (30), there are formed concave recessed steps (38a) (38b) for connection to the compressed air outlet openings (34a) (34b), respectively.
A spring (31b) that presses and biases the piston body (31a) in one direction between one end of the vibration generating cylinder (30) and the piston body (31a).
Is arranged ".

[0011]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A wall repair gun according to the present invention will be described below.
(A) will be described with reference to the illustrated embodiment. Wall repair gun (A)
A cylinder hole (2) is formed in the main body (1), and a piston (3) is disposed so as to be able to reciprocate. At the front of the main body (1), a gun front (6) provided with a vibration generator (4) and an injection member mounting part (5) is detachably screwed, and the main body (1) A gun rear portion (9) having a handle portion (7) and a piston guide (8) is screwed to the rear portion.

A valve unit (11), which is opened and closed by a trigger (10) attached to the main body (1), is attached to the handle (7) at the rear part (9) of the gun. A compressed air supply hole (12) provided at the bottom communicates with the rear space (K1) of the cylinder hole (2) through the valve device (11). Further, a branch pipe (3) branched on the downstream side of the valve device (11).
2) is connected to a vibration generator (4) described later.

The valve device (11) includes a bush (13) having a compressed air passage hole (14) opened in the inner surface thereof, inserted into and fixed to the handle (7), and slidably inserted into the bush (13). And a pair of O-rings (15a) (15b) for connecting / disconnecting the inlet / outlet side compressed air passage holes (14a) (14b) are pushed into the slide valve pin (16) and the bush (13). And a push-out spring (17) for urging the slide valve pin (16) in the push-out direction. (18) Bush (13)
The outer flange of the slide valve pin (16) that engages with.

The piston guide (8) has a guide rod (21) disposed at the center of the cylinder hole (2) of the main body (1), and a grip (22) screwed and fixed to the rear end thereof. It is composed of The guide rod (21) has a rear portion of the main body (1) screwed therein, and can slide into a slide hole (23) formed in a screwed portion (20) at an upper portion of the handle (7). Has been inserted. The piston (3) arranged reciprocally in the cylinder hole (2) described above is not fixed to the guide rod (21), but is inserted into the guide hole (24) formed in the piston (3). The guide rod (21)
Is inserted, and the piston (3) can reciprocate along the guide rod (21) in the cylinder hole (2).
(25) and (26) are O-rings fitted on the outer peripheral surface of the piston (3) and the inner peripheral surface of the guide hole (24), and the compressed air supply holes (12) before and after the piston (3) are supplied. This ensures airtightness between the rear space (K1) and the repair material filling space (K2) filled with the wall surface filling repair material (J). (27) is a stopper provided at the tip of the guide rod (21), and defines the advance limit of the piston (3).

The grip portion (22) is provided with the guide bar (21) as described above.
The screwed portion (20) is screwed and fixed to the rear end of the
It is detachably screwed to a screw portion (29) of a protruding portion (28) protruding from the rear end.

The vibration generating device (4) is composed of a vibration generating cylinder (30) drilled below the front part (6) of the gun and a vibration generating piston member (31). The vibration generating cylinder (30) has a branch pipe (32) branched from the compressed air supply hole (12).
Connected to the compressed air inlet (3
3) and a compressed air outlet (34) for releasing the compressed air to the atmosphere are provided on the opposite side. The compressed air inlet openings (33a) and (33b) and the compressed air outlet openings (34a) and (34b) which are opened on the inner peripheral surface of the vibration generating cylinder (30) of the compressed air inlet (33) and the compressed air outlet (34). ) Is branched into an outbound route and a return route.

On the other hand, the vibration generating piston member (31) is provided between the piston body (31a) and the closing screw plug (35) constituting one end of the vibration generating cylinder (30) and the piston body (31a). And a spring (31b) disposed at Piston body (31
In (a), when the piston body (31a) reciprocates in the vibration generating cylinder (30), it is recessed on the outer periphery of the piston body (31a),
Actuating grooves (33a) (33b) alternately connected to the compressed air inlet openings (33a) (33b), and openings from the operating grooves (33a) (33b) to the end of the piston body (31a). End opening (37a) (37b)
When the piston body (31a) reciprocates in the vibration generating cylinder (30), the compressed air outlet opening (34a) ( Actuating concave steps (38a) and (38b) connected to 34b) are formed. One end of the spring (36) is fitted in the outward step side operation concave step (38b), and urges the piston body (31a) in the backward movement direction.

Next, the injection member mounting portion (5) located above the vibration generator (4) will be described. Injection member mounting section
(5) is screwed to the front part (6) of the gun (of course, it may be an integral structure), and a ball valve (52) is provided in a valve space (51) formed inside.
And the ball valve (52) is provided with a liquid leakage prevention spring (53).
Is pressed in one direction to prevent liquid leakage from the wall-injection repair material (J).

At the tip of the injection member mounting portion (5), various injection members (60) applied to the wall repair situation can be mounted.
It is configured to communicate with a repair material supply passage (54) extending from the valve space (51) to the tip of the injection member mounting portion (5). Injection member
From (60), when the injection member (60) is pressed against the wall surface, the liquid leakage prevention spring (53) is bent to separate the ball valve (52) from the repair material extrusion port (55) of the valve space (51). A pressing pin (61) for opening the opening is provided. The rear end of the valve space (51) and the front end of the repair material filling space (K2) are connected by a repair material communication passage (56).

Wall repair material used in the method of the present invention
As (J), various types such as inorganic or organic type, one-pack type or two-pack type are used, but here, "It can be injected into micro cracks branching into concrete" Even when water is present, the filled wall-injection repair material (J) forms a dense hardened body so that cracks can be completely closed and re-integrated. '' It is easy to judge and it is possible to inject large quantities with pumps and guns etc. "
The penetration of water into the repaired crack should be about the same as that of the crack-free part '', which is a specification required for a wall-injected repair material (J). A slurry of hydraulic filler using ultra-fine blast furnace slag cement is used. Hereinafter, the ultrafine blast furnace slag cement will be described as a typical example.

The blast furnace slag cement is obtained by pulverizing blast furnace slag, Portland cement clinker and gypsum with a crusher so that the maximum particle diameter is 10 μm and the maximum amount of 2 μm is 30%, and then a predetermined amount of a high performance water reducing agent is mixed. Manufactured. At the time of use, a predetermined amount of a non-shrinking agent and water are kneaded with this blast furnace slag cement and used as a slurry.

Next, a construction method will be described. FIG.
As shown in (a), a hole for driving a repair member (40) into the wall (H) at an appropriate position (generally along a crack at a predetermined interval).
(70) is drilled at a predetermined depth x diameter. One or a plurality of cracks, which are repaired portions (h), communicate with this hole (70).
A large amount of concrete powder adheres to the inside of the drilled hole (70) and closes the crack (h), so a suction nozzle (not shown) is inserted into the hole (70), and the hole (70) is inserted. Suction the concrete powder in 70). Since the concrete powder in the hole (70) cannot be sufficiently removed only by suction, water is then blown into the mist with compressed air using a cleaning device (not shown), and the inside of the hole (70) is blown. Clean up to fine parts.
Subsequently, water is sprayed with compressed air to further clean the inside of the hole (70) and to sufficiently wet the inside of the hole (70) as well as the crack (h) communicating with the hole (70). I do.

When the washing and moistening inside the hole (70) is completed,
Then, it moves to the injection of the wall injection material (J). First, the hole (70)
Insert the repair member (40) into the
At (80), drive the repair member (40) all the way into the hole (70) (Fig. 6
(b) (c)). The repair member (40) has a slit at the insertion end (40a).
(41) is formed in a hollow cylindrical shape, a large diameter injection member mounting hole (42) is formed on the driving end side, and a small diameter hole (43) is formed on the insertion end side. A hollow wedge (44) is accommodated in a tapered hole (45) extending from the injection member mounting hole (42) to the small diameter hole (43). Therefore, the slit (41) is expanded by driving the wedge (44) into the small-diameter hole (43) with the second driving punch (81), and the insertion end (40) of the repairing member (40) is opened.
a) is firmly fixed in the hole (70).

After that, the injection member (60) is replaced with a wall repair gun.
(A) is mounted on the injection member mounting portion (5), and the tip of the injection member (60) is connected to the injection member mounting hole (42) of the repair member (40), thereby completing injection preparation. Reference numeral (46) denotes an O-ring for liquid tightness between the repair member (40) and the injection member (60).

At this time, the cylinder hole of the wall repair gun (A)
The piston (3) in (2) is retracted to the retreat limit of the cylinder hole (2), and the cylinder hole (2) is filled with a wall surface injection repair material (J). In addition, the ball valve (5) of the revenue member mounting part (5)
Is the repair material extrusion port (55) by the resilience of the liquid leakage prevention spring (53).
Is closed.

In this state, when the worker pulls the trigger (10),
The slide valve pin (16) of the valve device (11) is pushed into the bush (13) while bending the push-out spring (17), and the O-ring (15a) comes out of the rear end of the bush (13) and is compressed on the inlet side. The air supply hole (12a) communicates with the outlet side compressed air supply hole (12b), and compressed air passes through the valve device (11) and the cylinder hole (2).
Is supplied to the rear space (K1). This allows the piston
(3) is urged forward to compress the wall-injection repair material (J). In this state, the repair material extrusion port (5
Since 5) is closed, injection of the wall injection repair material (J) is not performed.

Then, when the wall repair gun (A) is pressed against the wall (H) immediately before or after the operation of the trigger (10), the pressing pin (61) attached to the injection member (60) is retracted. Ball valve (5
2) is projected, the ball valve (52) is separated from the repair material extrusion port (55), and the repair material extrusion port (55) is opened. Then the piston (3)
The more compressed wall injection repair material (J) passes through the repair material communication passage
(56), valve space (51), repair material through repair material supply path (54)
It is extruded into (40) and is pressed into crack (h) as shown in FIG. 6 (e).

On the other hand, a part of the compressed air flowing into the outlet side compressed air supply hole (12b) is supplied to the vibration generator (4) through the branch pipe (32). As shown in FIG. 4, before the compressed air is supplied to the vibration generating device (4), the piston body (31a) comes into contact with the retreating wall of the vibration generating cylinder (30) by the elastic force of the spring (31b). ing. When the compressed air is supplied to the compressed air inlet (33), the compressed air is retreated from the outward compressed air inlet opening (33a) on the retreat wall side communicating with the one operating groove (36a) of the piston body (31a). It is supplied to the forward pressure space (M) through the wall-side end opening (37a) and moves the piston body (31a) away from the retreating wall of the vibration generating cylinder (30) against the spring (36). Move.

When the spring (36) bends and the piston body (31a) collides with the closing screw plug (35), the recessed step portion (38a) on the receding wall side.
Communicates with the compressed air outlet opening (34a) on the retreat wall side, and the forward pressure space (M) formed between the rear end of the piston body (31a) and the retreat wall of the vibration generating cylinder (30) is The compressed air released to the atmosphere escapes from the compressed air outlet (34) through the compressed air outlet opening (34a). Then, the compressed spring (31b)
The piston body (31a) tries to return due to the resilience of the piston. At the same time, the compressed air inlet opening (33b) on the forward wall side branched from the compressed air inlet (33) communicates with the operating groove (36b) on the forward wall side of the piston body (31a) to compress. Air is supplied into the retreat pressure space (m) formed between the front end of the piston body (31a) and the closing screw plug (35) through the forward end opening (37b), and the piston body (31a ) Vibrating cylinder (3
0) Push back toward the retreating wall and collide with the retreating wall.

When the piston body (31a) collides against the retreating wall, the operating concave step (38b) on the advancing wall side of the piston body (31a) communicates with the compressed air outlet opening (34b) on the advancing wall side. The use pressure space (m) is opened to the atmosphere, and the air inside is released. By continuously repeating the above operation, it is possible to generate the axial vibration of the vibration generating cylinder (30). The frequency of this vibration is determined by the pressure of the supplied compressed air, the strength of the spring (31b) and the sliding state of the piston body (31a).
Preferably, it is in the range of 20,000 Hz.

The vibration is transmitted to the wall-injected repair material (J) as vibration in the injection direction, and is transmitted to the entire wall-injected repair material (J) during injection. As shown in Fig. 6 (e), the vibration in the injection direction transmitted to the tip of the wall injection repair material (J) penetrating the micro crack (h) destroys the surface tension generated on the surface. And make it easier to proceed. In addition, due to the presence of water injected prior to the injection of the wall injection repair material (J), the ultrafine blast furnace slag cement slurry does not absorb its moisture by the surrounding cracks (h), and therefore, its viscosity is increased It will invade without. When the crack (h) is penetrable, the wall-injected repair material (J) injected from one repair member (40)
Will flow out of the other repairing member (40), and the amount of the outflow is measured, and the actual amount of the injected slurry can be calculated by subtracting the amount from the injected amount. The actual filling amount also deducts the water content.

The frequency of the wall repair gun (A) is 5.0
When the vibration is as low as 00 Hz or less, the vibration may be transmitted to the worker's arm and cause white wax,
Since the frequency is 0 Hz or more, the health of the worker is not impaired. On the other hand, when the frequency is 20,000 Hz or more, the vibration energy transmitted to the tip of the wall-injected repair material (J) filled in the fine crack (h) is small, the surface tension is insufficiently broken, and the fine crack (h) Although the penetration into the inside becomes insufficient, the vibration is sufficiently transmitted to the wall-injection repair material (J) since the frequency is 20,000 Hz or less, and the filling performance thereof can be greatly improved.

Example 1 A plurality of repair members were driven into a cracked concrete sewer into a hole formed along the crack, the inside of the hole was cleaned, and vibration was applied in the pouring direction. While filling the wall surface, the crack was filled with the repair material. The next day, after removing the deposits on the injection surface of the wall injection repair material, a water stop test was performed. As a result, the cracks were completely closed and there was no water leakage.

Example 2 Holes were drilled at predetermined intervals along cracks generated in the concrete on the wall of a breakwater, a plurality of repair members were driven into the holes, and the inside of the driven holes was cleaned. The cracks were filled with the wall injection repair material while giving. The filled wall injection repair material completely closed the cracks and was integrated with the parapet concrete, thereby eliminating water leakage and concrete peeling.

Example 3 A hole was made along a crack generated in a sabo dam, a plurality of repair members were driven into the hole, and the inside of the driven hole was cleaned. Was filled in the crack. The filled wall-injection repair material completely closed the cracks and integrated with the concrete, eliminating water leakage.

[0036]

According to the present invention, since the wall-injection repair material is vibrated in the injection direction, the surface tension at the tip portion is broken, and the material can be easily embedded in the fine cracks which have been considered impossible. The wall injection repair material is pushed in, and the degree of completion of the wall repair can be increased.

[Brief description of the drawings]

FIG. 1 is a partially cutaway front view of a wall injection repair gun according to the present invention.

FIG. 2 is a detailed sectional view of the valve device of the wall injection repair gun according to the present invention.

FIG. 3 is a detailed sectional view of an injection member mounted on the wall injection repair gun according to the present invention.

FIG. 4 is a cross-sectional view of the vibration generating device of the present invention when the vibration generating piston is located on the retreat wall side.

FIG. 5 is a cross-sectional view of the vibration generating device of the present invention when the vibration generating piston is located on the forward wall side.

FIG. 6 is a sectional view showing a crack repairing procedure of the present invention.

[Explanation of symbols] (A) Wall repair gun (H) Wall (h) Repair part (J) Wall injection repair material (I) Surface injection repair material (40) Repair member

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme court ゛ (Reference) E02B 3/06 301 E02B 3/06 301 4F041 7/02 7/02 B (72) Inventor Masaharu Tsujimoto Tokyo 4-30-2 Koenji Kita, Suginami-ku TS Planning Co., Ltd. (72) Koichi Tanaka 3-7-1, Tatsumi Nishi, Ikuno-ku, Osaka-shi Matsui Kogyo Co., Ltd. (72) Kazuhiro Saijo, Inventor Matsui Kogyo Co., Ltd. F term (3-7-7 Tatsuminishi, Ikuno-ku, Osaka-shi) F-term (reference) AA17 AB01 BA04 CB08 CB30

Claims (4)

[Claims] 1. A method of repairing a wall, comprising inserting a repair member into a repair portion of a wall surface, connecting a repair gun to the repair member, and pressing a wall injection repair material into the repair portion of the wall. A wall repair method characterized by generating vibrations in a gun and press-fitting the wall repair material into the repair portion of the wall while giving vibration in the injection direction to the wall repair material. 2. An injecting member for injecting a wall-injection repair material into a repaired portion of a wall surface is attached to a tip, and has a piston for pushing out a wall-injection repair material housed through the injecting member. A gun for wall repair, comprising a vibration generator for generating vibration in the direction of injection of the wall injection repair material. 3. A vibration generating device comprising: a vibration generating cylinder provided in a direction in which a wall surface injection repair material is injected; and a vibration generating piston body reciprocally disposed in the vibration generating cylinder. 3. The wall repair gun according to claim 2, wherein: 4. A compressed air inlet and a compressed air outlet are provided on an outer peripheral surface of the vibration generating cylinder, and a forward and a return compressed air inlet opening and a compressed air outlet opening branched from the compressed air inlet and the compressed air outlet. Are respectively opened on the inner peripheral surface of the vibration generating cylinder. When the piston body reciprocates in the vibration generating cylinder, the compressed air inlet opening is recessed in the outer periphery of the piston body constituting the vibration generating piston member. The piston is reciprocated in the vibration generating cylinder, and is formed on the outer peripheral surface of the piston body at the end of the piston body. When it is moved, a recessed step for operation is formed to be connected to the compressed air outlet opening, and a valve for pressing and biasing the piston body in one direction is provided between one end of the vibration generating cylinder and the piston body. Wall repair gun according to claim 3, characterized in that are disposed.