JPH01229929A - Method for investigating crack, gap and leakage of water of concrete structure - Google Patents

Abstract

PURPOSE:To contribute to the execution of repairing construction, by making it possible to grasp or estimate the internal state of the crack part of a concrete body by allowing the suction port of a suction horse to closely communicate with the crack part. CONSTITUTION:A switch S is operated to operate a vacuum pump 2, a timer and a vacuum gauge 201, and the suction of air from all of crack parts (a) is started. If there are cracks (a) communicating with the other side surface of a concrete body A, the light fluid in a fluid container 3 is sucked and detected by a detector 202. Since the non-communicated crack parts (a) on the other side surface of the concrete body A also become a non-communication state with respect to the container 3, the fluid of the container 3 is not emitted and safety is secured. When the crack part (a) from which the fluid is sucked is not made clear, the opening and closing cocks 102 provided to respective hoses 1 are closed in order from the end and suction is made clear by the hose 1 when the operation of the detector is stopped. Therefore, a measure for leakage of water can be established rapidly with respect to the crack parts (a).

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application The present invention is applicable to the case where cracks, voids, water leakage, etc. are found in concrete buildings, concrete bridges, concrete embankments, and other concrete structures. This paper relates to improvements in methods for preliminary investigation of the condition, capacity, and communication with the outside of voids, leakage areas, etc.

Prior art] When cracks, voids, etc. are found in concrete structures,
As in the prior art described in JP-A No. 62-215773, a repair agent is injected without conducting a preliminary investigation, or as proposed in the invention described in the publication, the interior of the crack is injected without conducting a preliminary investigation. A repair method has been used in which a repair agent is injected by forcibly lowering the internal pressure inside the void, etc., to a lower pressure than the external pressure.

On the other hand, if water leakage is discovered in a concrete structure, a preliminary investigation is conducted. One of them is
As with the prior art described in Publication No. 471, there is a method for locating the water leakage point on the roof surface from the leakage location in the attic in buildings, and the other method is the invention described in the publication itself. As suggested by , if a water leak is found on the inner wall surface of a building, install a gas injection hole of an appropriate size and depth in a part of the leak, and seal the other part with a fast-setting agent or tape. Then, carbon dioxide gas at the appropriate temperature and pressure is pumped into the gas injection hole. This method uses a detection tool to catch the carbon dioxide gas that leaks through the water channel and onto the outer wall surface due to this pressure feeding.

Problems to be Solved by the Invention In the conventional technique described in JP-A-62-215773, in which repair work is carried out by injecting a repair agent without conducting a preliminary investigation, it is difficult to complete accurate repair work. This is as stated in the publication. In addition, in the prior art proposed by the invention described in the publication, since the volume of the inside of the crack and the void is unknown, it is difficult to inject the correct amount of repair agent, resulting in wasted injection amount. It is easy to inject the repair agent, and the condition inside the area is unknown, so it is more efficient to inject the repair agent while keeping the pressure at an appropriate level. If the pressure is weak, it will take time to inject every corner of the cracks, voids, etc.; if the pressure is strong, the solution will overflow from the injection side of the cracks, voids, etc., making post-treatment troublesome.

If the inside of the crack or gap is in communication with the outside, the injected repair agent will be pushed out to the outside, which will also cause troublesome post-processing.

According to the prior art described in Japanese Patent Publication No. 4471/1983, which conducts a preliminary investigation, it is not possible to accurately identify 11 water leakage locations, as stated in the publication. The prior art proposed by the invention described in the publication may be effective if there is only one leakage point, but it is not suitable for cases where many cracks, voids, etc. are discovered and the location of the leakage is unclear. No mention was made.

The present invention was made in view of the above-mentioned matters↑#KM, and when cracks, voids, hot water, etc. are found in a concrete structure, it is possible to understand or estimate their internal condition, internal capacity, communication with the outside, etc. The purpose of this study is to propose a preliminary investigation method that will enable accurate repair work to be carried out while maintaining the appropriate injection amount and injection pressure of repair agent.

Means for Solving the Problems The technical means achieved by the present invention to achieve the above object are as follows:
The suction ports of an appropriate number of suction hoses are tightly inserted into the cracks in the concrete structure, the cracks are sealed, and a vacuum pump connected to the discharge ports of the suction hoses is operated to remove the air in the cracks. Calculate the amount of air sucked using an electronic computer and record it on a recording paper, and closely insert the suction port side of an appropriate number of suction hoses into the cracks on one side of the concrete IJ frame, and The above can be achieved by sealing one side of the crack, disposing a fluid container on the other side of the crack, and operating a vacuum pump connected to the outlet side of the suction hose and provided with a fluid detector. The means is that the fluid detector is activated when fluid in the fluid container is aspirated.

With reference to FIGS. 1 to 3 of the embodiment drawings, claim 1
Concrete frame (A) shows the case where the Funkrete structure is a concrete building, and to explain the case where one long crack (-) is found in the concrete frame (4) K, the crack Drill an insertion hole (a,) at one or more places on the part (a) (the figure shows an example of three places that can be formed as appropriate depending on the length of the crack), and insert each of the insertion holes. (aI
) to prevent air or water leakage from the suction hose (1
) into the suction port side. A suction pipe (101) is attached in advance to the suction port side of the suction hose (1), and this pipe is tightly inserted into the insertion hole (a). Suction hose (1
), a lock is interposed between the suction nozzle (101) and the hole wall of the insertion hole (aL) to prevent air leakage, water leakage, etc. Then, seal the crack (a) with a quick-setting agent, tape, or other sealing means (eL).
, ) to prevent air leakage, water leakage, etc., and centrally read the discharge rotor of each suction hose (1) to the distributor (4). This is a machine that has the same purpose, structure, and performs the same function as the machine known as a foreign matter tank in the above publication, and is connected to a vacuum pump (2). The vacuum pump (2) is a machine that has the same purpose and configuration as the machine known in the above-mentioned publication, and performs the same function, and is a machine that supplies electricity via the switch (8). (6), and the power is turned on and off by opening and closing the switch (S). The vacuum pump (2) is equipped with an analog vacuum gauge (201) having a timer (not shown) for automatic operation. This vacuum gauge is O
~lQ m, v + or 4 to 20 M, A, using an analog-to-digital converter (5
) to a small electronic computer (C!PU), and electrically connect the vacuum pump (2) - vacuum gauge (201) - converter (5) - electronic computer ((!PU) , when the vacuum pump (2) operates, the vacuum gauge (201)
and a timer operate at the same time, and the degree of air suction by the vacuum pump (2) is determined by the vacuum gauge (201), and the degree is sent as a signal to the converter (5), where it is converted into digital data and sent to the electronic computer (CPU). The timer automatically stops the vacuum pump (2) and at the same time the vacuum gauge (201) also stops working, and the signal is sent to the converter (5).
It is then sent to the electronic computer <CPU>1
Δ is calculated, and the amount of air sucked by the vacuum pump (2) is calculated by this calculator, and is recorded in a recording port (not shown) and sent out. The converter (5) is a well-known converter that converts quantities, measurements, etc. from analog to digital, and is electrically connected to a small electronic computer (cpU).

The computer (CPU) is made by Ogawa and is called a Micro Combiator, and the necessary data is inputted in advance of the survey work. Data necessary for the investigation work includes the suction capacity of the vacuum pump (2) x suction time, the capacity of the distributor (4) + the capacity of the suction hose, etc. here,
As for the suction time, a preliminary investigation is conducted to determine whether or not the crack (a) communicates with the outside to introduce outside air, and the time measured in this preliminary investigation is input into a computer (CpU). Then, if the preliminary investigation reveals that the cracks (&) are communicating with the outside, they will be sealed.

If you find this one long crack (=), the investigation method is as follows: If there is only one suction hose (1), the opening/closing cock (10
2), close the switch (8) and turn on the vacuum pump (
2) Activate the vacuum gauge (201) and timer to start sucking air into the sealed crack (a), and watch the pointer on the vacuum gauge (201). Vacuum gauge (201)
If the pointer moves and points away from 0 on the scale, it means that the inside of the crack (a) is in a vacuum or near-vacuum condition, and conversely, the pointer hardly moves and points at the scale at O or 0. If the scale is close to , it means that there is no vacuum inside the crack (=). When the vacuum pump (2) is automatically stopped by a timer after a preset suction time has elapsed, an electronic meter 141 (cpU) calculates the air suction amount, records it, and sends it out. If the amount of air suction from the recording paper reaches a certain level, it can be determined that the inside of the crack (-) has become a vacuum, and the crack does not communicate with the outside and does not introduce outside air. However, if the amount of suction is not constant, it can be assumed that the crack (-) is communicating with the outside somewhere and introducing outside air (for example, if the concrete frame (A ), it can be assumed that it penetrates the side of the room and communicates with the outside). If there is only one suction hose (1), the investigation results can be easily determined as described above, but if one or more suction hoses (1) are used, the opening/closing cock (102) of each suction hose (1) is required. )
are closed one after another, and the suction level of the last remaining suction hose (1) is checked with the vacuum gauge (201). If the suction time elapses with the pointer of the vacuum gauge (201) pointing to 0 on the scale during suction with the last suction hose, the crack (a)
) are in communication with each other at some point and communicate with the outside to introduce outside air (in this case, it can be estimated in the same way as in the above parentheses). If the cracks (a) are in communication with each other but not with the outside, use a vacuum gauge (20
If you look at 1), you can determine that the crack part (a) has become a vacuum due to the simultaneous air suction of one or more suction hoses (1), and at the same time, the amount of air suction can be determined by the computer (CPU). . Once the amount of air suction is known, the volume inside the crack (a) can be calculated. In addition, a suction hose (1
), if the crack part (a) is not vacuumed within the preset suction time, continue suctioning air again and remove the crack part (-) within the above suction time again, regardless of the number of pipes used. Once a vacuum is created, it is possible to estimate the internal state of the crack (8L) based on the total suction time for two times. In other words, if the total suction time until the inside of the crack (target) reaches a vacuum is short, the crack width is wide and the suction resistance is low; if the time is long, the crack width is narrow and the suction resistance is low. Therefore, if the internal volume of the crack (-) can be calculated, it becomes possible to calculate the appropriate amount of repair agent to be injected, and the appropriate repair agent injection pressure can be determined based on the total suction time. If it can be estimated that the crack (a) is communicating with the outside, it is possible to establish water leakage countermeasures before water leakage occurs at the time of investigation.

Next, if many small cracks (a) are found as shown in Figure 4, insert the suction hose (1) tightly into only one arbitrary crack (lL) and seal the crack. Activate the suction pump (2) and start suction. The above crack (
If a) is an independent crack that does not communicate with other cracks (&), the pointer of the vacuum y-ji (201) will swing significantly and move away from 0 on the scale, indicating that a vacuum has been created. At the same time, the amount of air suction is calculated by electronic calculation g (CPU), recorded on recording paper, and sent out.
), the pointer of the vacuum gauge (2o1) either does not swing at all and points to O on the scale, or swings slightly and points to a mark close to 0 on the scale.

If the pointer of the vacuum gauge (201) does not swing or swings slightly in this way, seal all other unsealed cracks and perform suction again. If it is known that a vacuum has been created by this re-suction work, it is possible to calculate the volume of all the cracks (a) and the communication part based on the amount of air suction, and then calculate the appropriate amount of repair agent to be injected. As the cracks appear, the width of the cracks in the invisible communicating parts may be wide or narrow depending on the internal state in which all the cracks (a) communicate with each other in the invisible depths and the re-suction time. Since the internal state can be assumed, the appropriate repair agent injection pressure can be determined. Even though all the small cracks (-) are sealed and air suction is performed, the pointer of the vacuum gauge (201) does not swing or only swings rapidly, and there is no record on the recording paper. If the amount of air suction is not constant, the crack part (a) during air suction
It can be assumed that it is communicating with the outside at some point and introducing outside air (for example, it can be estimated that it is communicating with the outside by penetrating the indoor side of the concrete frame (A))
. Therefore, if it can be estimated that the crack (IIL) is communicating with the outside, it becomes possible to take measures against water leakage before water leakage occurs at the time of investigation.

Next, a water leakage investigation method (Section 2) for establishing water leakage countermeasures will be explained with reference to FIG.

As shown in the illustrated example, multiple cracks (a) are found on one side (outdoor side) of the outer wall of the concrete frame (A), and a number of cracks (a) different from the above cracks (a) are found on the other side (indoor side). A case in which a crack (a) in a book (a small number of books is shown) is discovered and it is unclear which crack (a) on one side and which crack (a) on the other side are connected is explained. Then, all the cracks (-) on the other side and the parts on the other side corresponding to the crack (a) that can only be seen on one side are filled with odorous gases, colored gases, coal seam gas, etc. that are different from air. A fluid container such as a cylinder or balloon filled with a light fluid (4
). On the other hand, on one side of the concrete frame (I-), before installing the fluid containers (4) on the other side, install the same number of suction hoses (1) as there are cracks (a).
Insert the suction vibrator (101) into all the cracks (IL). Then, each suction hose (1) is centrally read to a distributor (4), and the distributor is connected to a vacuum pump (2) having a vacuum gauge (201) with a timer (not shown).
This vacuum pump is provided with a fluid detector (202) for detecting the fluid in the fluid container (3), and the vacuum pump (2) is electrically connected to a power source (e) via a switch (8). , so that the power can be turned on and off by opening and closing the switch. The fluid detector (202) of the vacuum pump (2) has a similar configuration to a well-known gas leak alarm, and when a specific gas is detected, it sounds a detection sound,
Alternatively, if the fluid container (3) is a cylinder, the discharge port should be connected to a crack on the other side of the concrete structure (A). A holding band (not shown) is placed from the bottom or peripheral wall of the cylinder to the other side, and is bonded to the concrete body (A) to prevent fluid leakage. Temporarily fix it by bolting using a packing, etc. If it is something like a balloon, temporarily fix it by gluing the discharge port to the concrete body (A) to prevent fluid leakage. The fluid container (3) is configured so that when it is sucked by the vacuum pump (2), the discharge port opens and the fluid is discharged, and the discharge port does not open except during investigation to maintain safety. Configure it so that

After completing the preparations for the investigation, press the switch (8).
) to activate the vacuum pump (2), timer, and vacuum gauge (201) to begin suctioning air from all cracks (a). If there is a crack (a) communicating with the other side of the 5 concrete bodies (A), that is, if there is a crack (a) communicating with the other side of the 5 concrete bodies (A),
), if there is a crack (a) communicating with the fluid container (3
) is suctioned, detected by the fluid detector (202), and notified to the operator by a detector, detector, etc. The crack part (a) that does not pass through the other side of the concrete frame (A) also has no communication with the fluid container (3), so the fluid in the container will not be discharged and is safe. However, if you are not sure from which crack (a) the fluid is being sucked, try closing the opening/closing cock (102) provided on each suction hose (1) sequentially from the end, and the fluid will be detected. It can be seen that suction was being carried out by the suction hose (1) when the operation of the device (3) stopped. Therefore, water leakage countermeasures can be promptly established for the crack portion (a).

If a ceiling board, an interior board, etc. are installed, they must be peeled off to install the fluid container (3).

As is clear from the explanation of claim 2 mentioned above, the crack portion (
=), if the crack exists in the concrete frame (
If it is found that one side (outdoor side) of A) is not connected to the outside, it means that the other side (indoor side) of the building body is penetrated and connected to the outside, so immediately connect the other side. As soon as the crack (=) is found, a fluid container (3) can be installed to investigate and confirm.

Effects of the Invention Since the present invention has the first claim as described above, it becomes possible to understand or estimate the internal condition of the crack, the internal capacity, the communication condition with the outside, etc., so that appropriate repair can be carried out. It can contribute to the construction of repair work while maintaining the appropriate amount of injection agent and appropriate injection pressure of repair agent. and,
Since claim 2 is configured as described above, cracks that are leaking water or that are likely to leak water can be detected reliably and early using a vacuum pump, fluid, fluid detector, etc. This can contribute to the early establishment of water leakage countermeasures such as appropriate waterproofing repair work.

[Brief explanation of the drawing]

FIG. 1 is a front view schematically showing an investigation device used in the method for investigating cracks, voids, etc. of the present invention and its usage, and FIG. 2 is an enlarged front view showing a part of the device, partially cut away. Fig. 3 is a side view showing the crack in Fig. 2, Fig. 4 is a side view showing the other side of the crack, and Fig. 5 is a front view showing an outline of the investigation device used in the water leak investigation method and its usage. A partial longitudinal section is shown in the figure. In the figure (A)...Concrete frame (a)--Crack (CPU)--'Meiko calculation (Kaku (1)...Suction hose (2)...Vacuum pump (3)--Fluid container C2,)2)...Fluid detector patent applicant Akiyoshi Matsunaga
Masa Hayakawa Figure 2)○1

Claims (2)

[Claims] (1) Closely insert the suction ports of an appropriate number of suction hoses into the cracks in the concrete structure, seal the cracks, and operate the vacuum pump connected to the discharge ports of the suction hoses to fill the cracks. A method for investigating cracks, voids, etc. in concrete structures, characterized by sucking air, calculating the amount of air suction using an electronic computer, and recording it on recording paper. (2) Closely insert the suction ports of an appropriate number of suction hoses into a crack on one side of the concrete frame, seal one side of the crack, and place a fluid container on the other side of the crack. When the fluid in the fluid container is sucked by operating a vacuum pump to which the discharge port side of the suction hose is connected and a fluid detector is installed, the fluid detector is activated. Method for investigating water leakage in concrete structures.