JPS60126465A - Repairing of concrete structure - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a method for repairing concrete structures.

Cracks in concrete structures have recently become a major problem. It is said that cracks are caused by aggregate or sea sand, but in either case, a large number of concrete structures are being constructed using mountain gravel and sea sand.

If cracks occur in these concrete structures, it is predicted that extensive repair work will be required (1) 21Q-.

Cracks in concrete structures have the problem that it is very difficult to reliably fill the cracks with filler because it is not possible to check the inside of the cracks, and it is not possible to guarantee whether the cracks have been filled.

Conventional filling injection methods can be broadly divided into two types: high-pressure, high-speed, short-time injection and low-pressure, low-speed, long-time injection.

The high-pressure, high-speed, short-time injection method cannot ensure reliable injection because the filler diffuses in shallow areas near the crack entrance, and the low-pressure, low-speed, and long-term injection method requires skill and is difficult to work with due to the long time. It had the disadvantage of falling and increasing costs.

The present invention has been made in view of the above circumstances, and its purpose is to inject a filler under pressure into a crack after the inside of the crack in a concrete structure reaches a predetermined negative pressure. The filler can be reliably filled up to the tip of the crack in a short time, and the filler can be filled at the entrance of the crack, which has been a drawback of conventional filler injection methods. The goal is to eliminate things that cannot be done, that require skill, poor workability, and high costs.

Hereinafter, the present invention will be explained with reference to the drawings.

In the drawing, 1 indicates a concrete structure, and 2 indicates a crack that has occurred in the concrete structure 1.

In the drawing, numeral 3 denotes a vacuum pump, and the suction side of the vacuum pump 3 is connected to one connection port 5 of a vacuum tank 4 via a conduit 6. The other connecting lower a of the vacuum pump 3 is connected to one connecting port 9 of the switching valve 8 via a pipe 7, and the other connecting port 10 of the switching valve 8 is connected to the filling B via a pipe 11. It is connected to the tank 13 of the injection liquid 12. A pressure introduction port 30 is provided in the upper part of this tank 13, and this pressure introduction port 30 is connected to the outlet side of the air tank 32 via an air pipe line 31. A pressure gauge 36 is provided. 34 in the drawing is a compressor, and the discharge side of this compressor 34 is connected to the inlet side of the air tank 320 via a pipe 35. Further, the conduit 11 is provided with a cock 14. One end of a connecting pipe 16 is connected to the other connecting port I5 of the switching valve 8, and a nut 17 is provided at the other end of the connecting pipe 16. This connecting pipe 16 is provided with a vacuum gauge 18 and a cock 19. Further, the vacuum tank 4 is provided with a vacuum gauge 20.

Reference numeral 21 in the drawing indicates a joint, and a threaded portion 22 is formed at the end of the joint 21, and a flange 23 is formed on the joint 21.
is formed.

24 in the drawing is a seal sheet.

Next, a repair method for concrete structures will be explained.

A cut is made in the crack 2 of the concrete structure 1 to form an injection port 25. A seal sheet 24 as a seal member A or a sealant is applied or applied to the crack 2.

The seal sheet 24 may be pasted along the crack 2, or
The entire crack 2 may be covered with a surface.

A joint 21 is attached to the injection port 25, a flange 23 is used to press the seal sheet 24, and this portion is sealed with a sealant. Note that the joint 21 may be provided at one or more locations for each crack 2, that is, for each crack 2 on the surface (the cracks 2 connected are defined as -).

The connecting pipe 16 is connected to the joint 21 by screwing the cap nut 17 of the connecting pipe I6 into the screw portion (22) of the joint 21.

At this time, the switching valve 8 is switched to the OFF position so as to cut off the vacuum circuit 26.

Next, the vacuum pump 3 is driven to lower the pressure inside the vacuum tank 4. When the vacuum gauge 20 reads that the internal pressure has decreased to the specified negative pressure, the cock 19 is set to the connection position, the switching valve 8 is switched, and the vacuum circuit 26 is opened. For this reason, the air within the crack 2 is sucked into the vacuum tank 4, and the pressure inside the crack 2 becomes negative.

Then, when the vacuum gauge 18 shows the specified negative pressure, the cock 1
Place 9 in the cut position.

After turning the cock 19 to the off position, check whether the pointer of the vacuum gauge 18 does not move at all. If the pointer moves, it means that there is an imperfection in the sealing of crack 2, so complete the sealing of crack 2 until the pointer stops completely.

When the pointer of vacuum gauge 18 stops moving completely, turn on cock 1.
4 to the connection position, the switching valve 8 is switched, and the injection liquid circuit 27 is opened.

The air tank 32 is filled with compressed air discharged from a compressor 34, and this compressed air is passed through a pressure gauge 36 and a pressure regulating valve 33 to maintain a preset pressure.
Since the injection liquid 12 is in a pressurized state as it is pressure regulated and introduced into the tank I3, the injection liquid circuit 2
By opening 7, the injection liquid 12 is pumped and filled into the crack 2 by the suction force and pressurizing force caused by the vacuum.

Even if the crack 2 has a complicated shape, the injection liquid 12 will fill up to the tip of the crack 2 if the specified negative pressure is maintained inside.

As described in detail above, the present invention isolates the inside of the crack 2 of the concrete structure 1 from the outside air with the sealing member A, and after creating a predetermined negative pressure inside the crack 2 with the vacuum generating means, pressurizes the inside of the crack 2. This is a method for repairing concrete structures characterized by adding filler B and injecting filler B.

Therefore, since the filler B is injected into the crack 2 by pressure after the inside of the crack 2 of the concrete structure 1 reaches a predetermined negative pressure, the filler B can be reliably delivered to the tip of the crack 2 in a short time. can be filled.

This eliminates the disadvantages of conventional filling injection methods, such as the filling spreading in shallow areas near the crack entrance, making it impossible to perform reliable injection, and requiring skill, resulting in poor workability and high costs. can.

[Brief explanation of the drawing]

FIG. 1 is an explanatory diagram of cracks in a concrete structure and sealing members, and FIG. 2 is an explanatory diagram of the configuration of a vacuum generating filling injection device used in the construction method of the present invention. 1 is a concrete structure, 2 is a crack, A is a sealing member,
B is the filling. Figure 1

Claims (1)

[Claims] The inside of the crack 2 of the concrete structure I is isolated from the outside air by the sealing member A, and after the inside of the crack 2 is brought to a predetermined negative pressure by the vacuum generating means, the filler B is injected by applying pressure inside the crack 2. A repair method for concrete structures characterized by: