JP4793706B2 - A method of investigating the inside of concrete structures in water - Google Patents

Description

The present invention relates to an apparatus for underwater investigation of the degree of soundness inside a concrete structure, the diagnosis of cavities and cracks, and the state of reinforcing bars of buried reinforcement.

Cavity survey that can be detected by irradiating ultrasonic and electromagnetic waves while moving measuring equipment on land for diagnosing rebar status and soundness of existing structures and concrete structures with no design data remaining We are investigating the situation of cavities and reinforcing bars in concrete structures using equipment and reinforcing bar exploration equipment.

The internal inspection machine for concrete structures has advanced, and many high-performance devices that are small and can be operated by hand have been developed, making it easy to investigate the inside of concrete structures, calculating earthquake resistance and soundness The data is used for the data of the degree survey and seismic reinforcement.

In recent years, surveys of concrete structures have been conducted in various places in order to review the seismic resistance of concrete structures and diagnose the degree of deterioration. However, there are dam bodies such as dam lakes, incidental structures, river piers, port facilities, and power plant facilities. Internal investigations of underwater concrete structures have not been carried out, and it is necessary to take data such as internal conditions and bar arrangements as materials to judge when diagnosing the degree of deterioration and performing seismic reinforcement.

However, no device has been developed that can easily and inexpensively investigate the interior of concrete structures in the water.

Most of the equipment used to investigate the inside of concrete structures that are used in the air is made up of electronic equipment, and some of them are drip-proof, but they cannot be used directly in water. Most of the equipment.

In addition, even if the device is waterproofed and brought into the water, the distance cannot be measured. Even if a pressure-resistant box is made and placed in it, measurement failure due to the thickness of the part that maintains the pressure resistance occurs and the device does not operate normally. It was difficult to measure, and because there was water between the measurement part and the waterproof part, it could not be used because the data could not be taken accurately. For this reason, internal investigations of concrete structures in water have not been performed using commercially available measuring instruments.

Until now, in order to investigate the bar arrangement of concrete structures underwater, the method of investigating and revealing the reinforcing bars has been mainly taken up by removing the concrete underwater until it can be confirmed.

As another method, there is a method of enclosing the survey part from the water and draining the water to conduct the survey, but in order to make the survey area free of water, the survey surface is largely surrounded from the water surface to the measurement position. However, this construction method, which is a large-scale construction and expensive, was not carried out except in special cases.

In addition, there is a method of measuring by putting a surveying instrument that can inspect concrete inside into a pressure-resistant protective container. In this case, in most cases, water entered between the pressure-resistant protective container and the concrete structure to be measured, resulting in poor measurement accuracy and the required data could not be obtained.

Most reinforcing bar probes that measure by irradiating electromagnetic waves, etc., use wheels to measure the moving speed and moving distance. It is difficult to accurately measure the distance traveled by placing such equipment in a pressure-resistant protective box and moving it by hand. Since the frequency of use of underwater investigation is low, no dedicated concrete internal investigation equipment that can be used underwater has been developed.

The electromagnetic wave radar receiving / transmitting part protection part of the rebar probe, which is a general-purpose internal investigation device for concrete structures, is made as thin as possible and is not easily affected by the material of the protection part. In order to obtain accurate and reliable data, it is better that the survey surface and the transmitter / receiver are close, and there should be no obstacles such as liquids and solids, so there is thickness when creating a pressure protective container It becomes an obstacle to measurement.

Since the strength of the protection part of the transmission / reception part is small, there are many structures that cannot perform the pressure resistance function as they are, and even if they have a waterproof function, they can be used only at extremely shallow water depths. As for commercially available survey equipment, survey equipment for conducting an internal survey of concrete structures in water has not been developed.

Since a machine that can be easily measured in water has not been developed, it is not possible to collect data on the reinforcing bar arrangement of concrete structures, which is the basic data for conducting soundness surveys, repairs and reinforcements. Most of the concrete structures in the country have not been inspected.

In recent years, a portable independent investigation device has been developed that can confirm the internal conditions of concrete structures. Compared to conventional products, it is a lightweight, low-cost, high-performance device.

Some of these devices can operate normally even under high pressure if they are in the air. Even under pressure, the inside of a concrete structure can be normally examined, and the arrangement of reinforcing bars and cavities Something that can be investigated is sold.

A pressurization test was conducted in a 0.3 MPa pressurization chamber using a commercially available handy type reinforcing bar probe. A concrete sample with reinforcing bars was made and tested. As a result, it was confirmed that there was a device that could operate normally under a pressure of 0.3 MPa and obtain data, and that an internal investigation of the concrete structure was possible even under the pressure.

Up to now, as the internal investigation method for underwater concrete structures, only visual inspection, reinforcement inspection by crushing the concrete surface, sample collection investigation by core removal, etc. can be performed, and the soundness of the structure can be easily confirmed. Therefore, it is desired to develop an investigation method and apparatus capable of conducting an internal investigation of a concrete structure in water.

In the temporary closing structure and the temporary cutting method of the existing underwater structure described in Japanese Patent Application Laid-Open No. 2005-264500, the concrete surface in the underwater part is suspended from the surface of the water by a method in which the surface of the concrete is in the air like the land part. The survey position is a method of lowering the shield from the position above the water surface to the ground with the shield and surrounding the entire survey surface to make it in the atmosphere. However, there are many points that are limited to the method of investigating by removing the water only in the position to be investigated in any underwater part. In addition, it is easy and easy to remove water, so it is very cheap, the survey location can be varied in a wide range such as the ceiling, and the construction period is very different.

JP 2005-264500 A

A device that can easily and inexpensively underwater use investigation equipment used on land to conduct reinforcement inspection of underwater concrete structures and internal investigation of concrete structures.

If water enters between the survey surface of the concrete structure and the measurement wave receiving / transmitting part of the reinforcing bar probe, the measurement accuracy of the survey instrument will drop and accurate information will not be obtained. A method to prevent water from entering the survey position of the ceiling, wall, and floor of the survey surface of a concrete structure.

A pressure-resistant protective container that can store internal investigation equipment for concrete structures, and can be put in and out even under pressure without being damaged by pressure changes.

Small internal inspection equipment for general-purpose concrete structures is about 20cm x 20cm at the bottom, and the electromagnetic wave receiving / transmitting part can only be separated from the surface of the structure by 1cm to 2cm. Many of these devices are said to be inaccurate if they take a longer distance, making it impossible to conduct accurate surveys. The pressure-resistant protective container that holds the internal investigation equipment for concrete structures brought into the water is a pressure-resistant structure to prevent the effects of electromagnetic wave attenuation and to obtain accurate data, but the pressure-resistant protective part of the electromagnetic wave transmitting / receiving part is made as thin as possible. There is a need to. Development of a pressure-resistant protective container that can reduce the pressure-resistant protective part of the electromagnetic wave transmission / reception part.

The investigation position of the concrete structure in the water must be assumed even when the water depth is 50 m. The pressure resistance of the pressure protective container is required to be 0.5 MPa. Development of pressure-resistant protective containers that can be used at this depth.

Rather than a method of taking distance measurement data by rotating tires, etc., development of a concrete internal investigation device that can take measurement distance data underwater in a pressure-resistant container.

This invention is an apparatus which can investigate the inside of an underwater concrete structure made in view of said subject, and the condition of a reinforcing bar underwater.

A pressure-resistant protective container that can be used for underwater inspection equipment for concrete structures used in land. This pressure-resistant protective container has the ability to withstand more than the pressure of the working water depth, and a pressure equalizing device that can easily bring the inside of the container to the same pressure as the external pressure even after the pressure changes at a place where it is in the middle of the water. Therefore, the device can easily open and close the lid of the pressure-resistant protective container. If the pressure drops below the water depth, the protective container is prevented from expanding and a pressure relief device that reduces the pressure is provided to prevent damage caused by the expansion of the container. Will be able to.

If the survey area is a ceiling by removing the water at the survey location and making it feel in the water, surround the survey area, open the part that hits the bottom, and send air from the open part. Drain the water, bring in a measuring instrument, such as a reinforcing bar probe, placed in a pressure protective container, put it in from the surface of the water that hits the bottom, and operate the pressure equalization equipment equipped in the pressure protective container in it to detect the reinforcing bar The diver who took out the machine and entered the aerial part in the investigation area that became the aerial part can investigate the arrangement situation of the reinforcing bars.

If the survey area is a wall surface by removing the water at the survey location and putting it in the air, surround the survey section from the side, open the part that hits the bottom, and send in air from the open part. Drain the water, bring in a measuring instrument, such as a reinforcing bar probe, placed in a pressure protective container, put it in from the surface of the water that hits the bottom, and operate the pressure equalization equipment equipped in the pressure protective container in it to detect the reinforcing bar The diver who took out the machine and entered the aerial part in the investigation area that became the aerial part can investigate the arrangement situation of the reinforcing bars.

If the survey location is the ceiling or side by removing the water at the survey location and placing it in the water, you can easily install a box that can be placed in the mid-air, but for the bottom portion where the survey location is the bottom. Even if you make an aerial part in the investigation part position, water will invade when you try to enter it. For this purpose, a door is attached to the enclosure, and the diver brings the investigation device into the enclosure installed at the bottom, closes the door and drains the water. Operate the pressure equalization device of the pressure-protection container of the internal investigation equipment for concrete structures and take out, for example, a reinforcing bar probe, and a diver conducts an internal investigation of the concrete structure, and investigates the situation of the reinforcing bars in the investigation room that is in the air. Can be done.

If the survey area is at the bottom by removing the water at the survey location and taking the air into the water, and it takes too much time to drain the internal water, the dive time will be longer. Install a box. After draining the water in the enclosure of the research room in advance, the diver enters the sub room and brings in a measuring device, such as a reinforcing bar probe, that has been placed in a pressure-resistant protective container, and then removes the water in the sub room. Then, the pressure equalization device is operated and the rebar probe is taken out, and the diver can investigate the inside of the concrete structure and the state of the rebar in the investigation room.

The pressure-adjusted pressure-resistant protective container is brought into the water with the concrete structure investigation device inside, and a pressure slightly higher than the pressure applied from the outside into the pressure-adjusted pressure-resistant protective container, for example, a pressure of 0.003 MPa. Gas is automatically fed and this pressure difference is always maintained. If this state is maintained, the pressure-adjusted pressure-resistant protective container may be a pressure-resistant container that can withstand a pressure of about 0.003 MPa, and will not be broken even at a deep water depth, for example, a water depth of 50 m. By adopting this method, the electromagnetic wave transmission / reception part of the pressure-adjusting pressure-resistant protective container can be made of a thin material. The pressure-resistant waterproof protection part of the electromagnetic wave transmission / reception part can be easily made with a thin material such as acrylic material that is difficult to influence the electromagnetic wave radar transmission / reception, and pressurization that provides accurate data Adjustable pressure-proof protective container can be made.

Furthermore, a cover is formed around the front surface of the transmission / reception unit of the pressure-adjusted pressure-resistant protective container, and a device that can remove water by sending gas from the outside to the water between the measurement surface and the electromagnetic wave transmission / reception unit is attached. Use a waterproof waterproof seal for the cover. The method for stopping water is to send gas into the inside to suppress the waterproof seal. In addition, the waterproof seal that has been restrained should be made of a material having such a strength that it cannot be swept outside by pressure. Provide a drainage outlet that can drain water deeper than the lower end when using a pressure-adjustable pressure-resistant protective container. Since the drainage port is also used to maintain the pressure of the pressurized gas supply unit in a state slightly higher than the external pressure, the drainage position is always installed deeper than the lowermost part of the pressure-adjusting pressure-resistant protective container. If a plurality of drain outlets are collectively installed deeper than the lowermost part, a pressurized state is obtained, and the internal pressure is always higher than the external pressure in the space between the electromagnetic wave transmission / reception unit and the investigation surface. Moreover, the same effect can be acquired by providing a drain outlet in the circumference | surroundings and pressing a drain outlet with a spring etc. so that it cannot drain unless it is a pressure higher than the circumference. Since the waterproof seal part is suppressed by the increased pressure, it is possible to prevent inundation and to eliminate water, and to create an aerial part between the electromagnetic wave transmission / reception part and the investigation surface. By this method, even if an internal investigation device for a concrete structure is placed in a pressure-adjusted pressure-resistant protective container, water is excluded, so an accurate investigation can be performed.

The survey equipment for concrete structures is usually equipped with a tire on the machine to output distance data, but it has a function that can measure the position or distance at the time of measurement using light waves or lasers. By using a thing, the distance at the time of movement measurement can be taken out. Also, water can be eliminated by installing a soft auxiliary measurement sheet on the measurement surface in water and keeping it in close contact with the surface. Since the water on the front side of the transmitter / receiver can be eliminated by pressing the transmitter / receiver of the device against the measurement auxiliary sheet and moving it in close contact with the measurement auxiliary sheet, the inside of the concrete structure in the water is investigated. be able to.

By using this device, internal investigations such as reinforcing bar arrangement and cavities of concrete structures can be conducted without destroying concrete structures in the water. Will be obtained.

Using electromagnetic radar equipment of concrete internal investigation equipment, investigation inside concrete structures in underwater areas such as dam lake levee body and incidental structures, river piers, harbor facilities, power plant facilities, etc. Such a survey can be easily performed in a short time.

Compared with the conventional method in which the water in the survey area is enclosed from the position above the surface of the water and all the water is removed, the cost is very low and the construction period is shortened.

Compared to investigating cracks and reinforcing bars on the concrete surface using the conventional investigation methods, it is possible to easily and accurately conduct a wide-range investigation in a short time without damaging the concrete structure.

Since the basic data for diagnosing a concrete structure is output as electronic data, it is possible to easily perform underwater reinforcement work, for example, seismic reinforcement construction planning and position determination during construction.

Conceptual diagram of a diver exploring reinforcing bars on an underwater wall Conceptual diagram of the cross section of the enclosure attached to the wall Conceptual diagram of the side of the box attached to the wall Conceptual diagram of a cross section of a box attached to the ceiling Conceptual drawing of the cross section of a box with a subchamber attached to the bottom Conceptual drawing of the plane of a box with a subchamber attached to the bottom Conceptual diagram of an example of the survey equipment in a pressure-resistant protective container Conceptual diagram of an example of the survey situation when the survey department is a slope Conceptual diagram of the cross section of a pressure-adjustable pressure-resistant protective container Conceptual diagram of the side of a pressure-adjustable pressure-resistant protective container Conceptual diagram of the plane of a pressure-adjustable pressure-resistant protective container Conceptual diagram of the cross-section investigated by inserting a measurement auxiliary sheet between the tires coming out of the pressure adjustment pressure-resistant protective container Conceptual diagram of the cross section where the tire coming out of the pressure-adjusting pressure-resistant protective container runs through the measurement auxiliary seat groove

Fig. 1 is a conceptual diagram of a diver exploring reinforcing bars on an underwater wall. Fig. 2 is a conceptual diagram of a section of a box attached to the wall. Fig. 3 is a side view of the side of the box attached to the wall. FIG. 4 is a conceptual diagram, and FIG. 4 is a conceptual diagram of a section of a box attached to the ceiling surface. It is a figure showing that the investigation position of the concrete structure in the water is the wall surface and the ceiling, and that the middle part is made using the enclosure at the investigation position.
An electromagnetic wave type reinforcing bar probe which is a typical internal inspection device for concrete structures will be described as an example.

FIG. 1 is a conceptual diagram in which rebar exploration is performed on an underwater wall surface. For example, an electromagnetic wave type reinforcing bar exploration device that is an internal investigation device for concrete structures, it is easier to use a handy type in a pressure-resistant protective container. An example in which a wire-type structure can be used by providing a penetration portion and waterproofing is shown. Moreover, it is the conceptual diagram showing the investigation method and apparatus which can confirm the measurement condition also by the person on land by installing an underwater video camera from the land part.

Figure 1 shows the case where the survey area is a wall surface underwater. A wall box is installed in the wall so that the survey area can be in the air. It is a conceptual diagram which is investigating a concrete structure using a reinforcing bar probe in the aerial part. A diver puts the rebar probe in a pressure-resistant protective container with a waterproof function and brings it into the air in the enclosure, and takes out the rebar probe in the inside of the concrete structure. It is a conceptual diagram which is investigating the situation of reinforcing bar arrangement.

Reference numeral 1 in the figure denotes a pressure protective container. It is a pressure-resistant protective container with a waterproof function that has a structure in which a rebar probe can be put in the water, put it in the water, put it in the water, and put it in and out in the air inside the enclosure. This pressure-resistant protective container has a strength that can withstand the pressure of the investigation water depth, and has a structure that can be easily taken out of the enclosure. Furthermore, since it is put in a pressure-resistant protective container in the atmosphere of a pressurized enclosure, if it rises in the water surface direction, the external pressure will decrease, so the internal pressure will increase and internal expansion will occur. It is a pressure-resistant protective container provided with the pressure relief device which discharge | releases in.

Reference numeral 2 in the figure is a concrete structure internal inspection device. Investigation equipment inside concrete with the ability to operate normally in the air under pressure, investigation equipment using electromagnetic waves that can investigate the inside of concrete structures without breaking down, the state of cavities, vinyl chloride and reinforcing bars (common name) Reinforcing bar probe).

Reference numeral 3 in the figure is a box. It is a box that is fixed to a concrete structure with an anchor, and it has a structure in which gas can be stored in the box and an air in the same pressure as the outside can be made in water. The size of the enclosure can be determined each time depending on the survey area and construction status.
If the wall surface is as shown in FIG. 1, a structure in which a diver can carry out investigations from the lower part of the enclosure by taking investigation equipment into the air of the enclosure, taking it out of the pressure-resistant protective container 1 and operating it. It has become.

Reference numeral 4 in the figure is an anchor for fixing the enclosure. The enclosure stores gas therein, so that when the gas is fed in, water is removed and buoyancy is generated. The buoyancy is an anchor for keeping the enclosure from moving.
For example, if the survey area of the enclosure is 1m x 5m and the thickness required for a diver to work is 0.5m, the buoyancy will be about 2.5 tons. Since the enclosure can be fixed, installation is easy.

Reference numeral 5 in the figure denotes an aerial part in the water created in the enclosure. If the wall and ceiling are to be surveyed, the space is large enough to investigate if there is enough space for the divers' hands and heads. In addition, if a larger space is required for the investigation, it is easy to create an aerial part adapted to the size.

Reference numeral 6 in the figure is a diver. Work in the water, such as installing a box with the survey area in the air, sending in gas to bring it into the air, or bringing in the survey machine, and operate the survey machine at the survey location in the air And conduct surveys. It is also possible to send video and data to the land via a cable using a video camera, etc., and to search for instructions using an underwater phone.

Reference numeral 7 in the figure denotes an underwater video camera. The survey status can be confirmed from the land.

Reference numeral 8 in the figure is a monitor television. It is a device that can check the underwater situation even on land, and it shows the image captured by the underwater video camera 7.

Reference numeral 9 in the figure is a cable in the case of a wired survey device. Reinforcing bar exploration device that can be used not only in the reinforcing bar probe that is an internal investigation device for handy type 2 concrete structures but also in the aerial part under pressure in water In the case of, survey data can be sent to the land through a cable that is stored in a pressure-resistant container equipped with an underwater connector.

Reference numeral 10 in the figure is a monitor controller of a wired survey device. It is a machine that operates and surveys the reinforcing bar probe, which is the internal investigation device for the concrete structure of code 2, with the cable of code 9, and receives and records the data after the survey.

Reference numeral 11 in the figure denotes a concrete structure. It is a concrete structure in the water which becomes a part which performs an internal investigation with the reinforcing bar probe which is an internal investigation apparatus of the concrete structure of the code | symbol 2.

Reference numeral 12 in the figure is the bottom of the aerial part in the water made in the enclosure. If the survey location is the wall or ceiling, a rebar probe, which is the internal investigation device for the concrete structure of code 2 inserted in the pressure protective container of code 1, was created in the enclosure of code 3 from this part. This is the part that divers bring into the aerial part of the water and take it out. This bottom portion also serves as a drain outlet for sending gas into the enclosure 3 and removing water in the enclosure.

5 and 6 are conceptual diagrams of the enclosure when the bottom is the survey position. This enclosure has an investigation room and a sub-room, and is an installation situation diagram of the enclosure that can be investigated with the investigation range at the bottom as the air. If there is no sub-room, the water is drained in the state where the diver is directly in the enclosure, and the survey is conducted, but the survey room tends to be large, so draining and water injection takes time.

The work procedure when the investigation position of the underwater concrete structure in FIGS. 5 and 6 is at the bottom will be described with a box device having a sub chamber capable of shortening the dive time. A box with an integrated investigation room and sub-room is installed at the investigation location with an anchor. The door between the investigation room of reference numeral 14 and the sub-chamber of reference numeral 15 is closed, gas is sent from the outside using the water supply / drainage facility of the investigation room of reference numeral 18, and the water in the investigation room of reference numeral 14 is drained. At that time, the door between the sub chamber denoted by reference numeral 17 and the outside is opened. When the drainage of the water in the investigation room of reference numeral 14 is completed, the diver of reference numeral 6 is a reinforcing bar probe which is an internal investigation device of the concrete structure of reference numeral 2 in the pressure protection container of reference numeral 1 in the sub chamber of reference numeral 15 Enter with. When the diver of reference 6 enters the sub chamber of reference 15, the door between the sub chamber of reference 17 and the outside is closed and the water supply / drainage facility of the sub chamber of reference 19 is used, and gas is supplied to the sub chamber of reference 15 from the outside. Feed and drain the water. After draining the water in the subchamber 15, the diver 6 opens the door between the subchamber 16 and the research room and enters the investigation room 14. If drainage at the survey location is inadequate, the diver will allow the water to be removed from the water leak protection enclosure at 20 before the survey. After the cleaning is completed, the rebar exploration machine, which is the internal investigation device for the concrete structure with reference numeral 2, is taken out from the pressure-resistant protective container with reference numeral 1 in the investigation room, and the investigation is started in the same manner as the investigation on land.

When the survey is completed, the rebar exploration device, which is the internal investigation device for the concrete structure of reference numeral 2, is placed in the pressure protection container of reference numeral 1, and the diver of reference numeral 6 having the pressure protection container of reference numeral 1 is the sub chamber of reference numeral 15. The door between the subchamber 16 and the investigation room is closed, and the water supply / drainage facility 19 is operated to fill the subchamber with water. When the water is filled and the pressure is the same as the outside, the door between the sub-chamber 17 and the outside is opened, and the diver holds the pressure-protection container 1 and the enclosure with the survey room 13 and the sub-chamber 13 Go out and finish the survey.

Reference numeral 13 in FIGS. 5 and 6 is a box provided with an investigation room and a sub-room. When the survey position is the bottom, unlike the case where the wall surface and the ceiling are the survey position, the aerial part in the water made in the encircling code box 12 in the encircling box code 3 that brings in the equipment. There is no bottom, so a box with a different basic structure from the wall and top is required. Even if you try to operate by putting your hands inside from the outside of the box, it is difficult to investigate because water enters from the outside because there is a difference that the outside is water and the inside is air. In the case of the investigation by the reinforcing bar probe which is the internal investigation device of the concrete structure of the code 2 put in the pressure-resistant protective container of the code 1, the diver will enter the enclosure completely, It is necessary to remove the water inside and investigate. In order to facilitate access to the study room, a box with a study room and sub-room was installed. In addition, when the survey surface is the bottom compared to the wall surface and the ceiling surface, a relatively large enclosure is required because it requires a size for a person to enter.

Even if it is a relatively large enclosure, the size of what is shown in the conceptual diagram in FIGS. 5 and 6 is 2.5 m × 6 m × 1.5 m and the buoyancy is about 22.5 tons. The pressure applied to is the same pressure as the outside, so it doesn't need to be so strong. Since it can be placed on the survey position of the concrete structure and installed with an anchor, installation and fixing can be easily performed, and drainage can be easily performed because water is pushed out by simply sending gas from the compressor.

Reference numeral 14 in FIGS. 5 and 6 denotes an investigation room. The enclosure at the bottom of the survey is relatively large because a diver enters inside, and it takes time to drain water and conduct a survey at once, with the diver inside. Drain the water and go in and out in a small subchamber. If it is a small sub-room, the construction time can be reduced because it does not take as much time for water injection and drainage as the survey room. In addition, it is possible to easily carry out survey equipment.

Reference numeral 15 in FIGS. 5 and 6 denotes a sub chamber. It is a room for entering and exiting the investigation room.

Reference numeral 16 in FIGS. 5 and 6 denotes a door between the sub chamber and the investigation chamber. When a diver who is an investigator enters the research room, it is a partition door with a sub-chamber for preventing external water from entering and draining the research room in advance.

Reference numeral 17 in FIGS. 5 and 6 denotes a door between the sub chamber and the outside. This is a door between the outside so as not to allow water to enter when the investigator enters and exits the enclosure provided with the investigation room of reference numeral 13 and the sub-chamber of reference numeral 14.

Reference numeral 18 in FIGS. 5 and 6 denotes a water supply / drainage facility in the research room. Several places can be provided for faster drainage. In addition, this facility can be used to feed gas and ventilate the investigation room 14.

Reference numeral 19 in FIGS. 5 and 6 denotes a sub-chamber water supply / drainage facility. Drainage and water injection can be performed even when a diver who is an investigator is in this sub-room. In addition, gas can be fed and the sub-chamber 15 can be ventilated using this equipment.

Reference numeral 20 in FIGS. 5 and 6 is installed in an investigation room 14 which is a water leakage countermeasure enclosure. If the interior of the research room is low, the surface is slightly sloped, or there are irregularities on the side of the meter, drainage to the point where it is impossible to measure even the slight intrusion water required for the survey with the water supply / drainage system of number 18 alone. It is difficult, and as a countermeasure against this, for example, a water stop weir plate having a height of about 5 cm is arranged so that water can be easily removed.

FIG. 7 is a conceptual diagram of an example of a state in which the investigation device is placed in a pressure-resistant protective container. The pressure-resistant protective container 1 is waterproof and can withstand pressure changes. Since this protective container is brought to the survey position at a depth of 50 m, for example, in accordance with the survey position, it is necessary to have strength to withstand the pressure. In addition, the aerial part of the survey position in the water is in a pressurized state at that depth. In order to take out from the pressure protective container, the pressure in the pressure protective container and the pressure in the air in the enclosure It is necessary to equalize the pressure, so a device that can equalize pressure is installed. Further, when returning to the land after the survey is completed, the pressure-resistant protective container is stored at the pressure in the enclosure, so that the pressure is higher than that on the land. Normally, the pressure vessel has a structure that can withstand the pressure applied from the outside, but there are not so many countermeasures against pressure and expansion pressure applied from the inside. In this state, it is easy to break if it is lifted to the water surface, and a pressure-resistant protective container having a considerably strong structure is required to withstand the internal pressure and the expansion pressure. In order to prevent breakage, a pressure-resistant protective container with a pressure relief function that has a structure in which the internal pressure is always the same as the external pressure is shown.

Reference numeral 21 in the figure is a pressure relief device. It has a check valve function, and the pressure and water from the outside do not enter the pressure-resistant protective container, and it is a device that has the function of releasing the pressure when the internal pressure becomes higher than the set value from the outside. .

Reference numeral 22 in the figure is a pressure equalizing device. When the reinforcing bar probe, which is the internal investigation device for the concrete structure of reference numeral 2, is taken out from the pressure protection container of reference numeral 1, the lid is pushed by pressure, and the lid of the pressure protection container of reference numeral 1 cannot be opened. In order to prevent this, it is a pressure equalizing device for making the pressure inside and outside the same.

FIG. 8 is a conceptual diagram of the exploration situation when the survey section is a slope. It is a figure in the case of being able to continuously measure while the investigation equipment is moving by its own weight or by remote operation, and is a figure showing that the investigation can be performed without entering a person. Also, by specifying and marking any position such as the device data and the operation start position, it becomes possible to identify the location of the reinforcing bars and the location of the damage even after the box 3 is removed. .

Check carefully again from here. Fig. 9, Fig. 10, Fig. 11, Fig. 12 and Fig. 13 show that the inside investigation of the concrete structure can be investigated while moving in the pressure-adjusted pressure-resistant protective container of reference numeral 23. It is a conceptual diagram of the investigation equipment which can be done. By using this device, the concrete structure can be investigated without providing the enclosure. For example, in the case of a reinforcing bar probe using electromagnetic waves for the internal investigation of a concrete structure with reference numeral 2, four tires are attached, and the travel distance can be measured by the rotation of the tires. The measurement method of a rebar probe that is a normal electromagnetic wave radar is a specification that can measure the position and size of the rebar by irradiating the electromagnetic wave with changing position while moving, so the distance of movement, reception and transmission of electromagnetic waves It is important to determine the position of. When the reinforcing bar probe, which is an internal investigation device for the concrete structure of reference numeral 2, is put in the pressure protective container of reference numeral 1, the tire does not rotate even if it moves because the tire enters the pressure protective container of reference numeral 1, Therefore, it is difficult to accurately determine the distance of movement. The axis of the tire that measures the distance attached to the reinforcing bar probe, which is the internal investigation device for the concrete structure No. 2 in the No. 1 pressure protection container, is extended to the outside of the No. 1 pressure protection container and extended It is a conceptual diagram of the pressure adjustment pressure-resistant protective container of the code | symbol 23 which pressure-proofed and improved the pressure-resistant protective container of the code | symbol 1 in the condition which does not interfere even if the part and the part which a protection container touches are rotated.
Although it is not currently developed, if a machine that measures the distance by launching a laser wave, ultrasonic wave, light wave, etc. to check the distance by providing a starting point or reflector, etc., a tire for measuring the distance Therefore, measurement can be performed by putting the shaft and tire in a pressure-resistant protective container of reference number 1 without taking them out. The figure will be described by taking as an example a reinforcing bar probe which is an internal investigation device for a concrete structure of reference number 2 using electromagnetic waves, which is a popular product currently being marketed and is an investigation device using tires. Although not illustrated in the figure, in the case of a wired type reinforcing bar probe that can be used not only in a handy type reinforcing bar probe but also in the aerial part under pressure, a pressure-adjusted pressure-resistant protective container of reference numeral 23 provided with an underwater connector or the like. You can store it in the water and use it in the same way.

9 is a conceptual diagram of a cross section of a pressure-adjusted pressure-resistant protective container, FIG. 10 is a conceptual diagram of a side surface of the pressure-adjusted pressure-resistant protective container, and FIG. 11 is a conceptual diagram of a plane of the pressure-adjusted pressure-resistant protective container. An investigation of the inside of a concrete structure can be conducted while being moved in a pressure-adjusted pressure-resistant protective container denoted by reference numeral 23. It shows a method that excludes water on the survey surface with gas.

The pressure-adjusted pressure-resistant protective container denoted by reference numeral 23 is not only the whole pressure-resistant protective container by taking a method of reducing the difference between the internal pressure and the external pressure, but particularly the thickness of the protective part of the measurement wave receiving / transmitting part denoted by reference numeral 25. Can be made extremely thin. For example, in a reinforcing bar probe which is an internal investigation device for a concrete structure with reference numeral 2, it is said that the thickness of the protective plate of the electromagnetic wave irradiation part is within 10 mm so that the measurement is not hindered. Although measures such as reinforcement can be taken if it is other than the measurement wave transmission / reception unit, it is difficult to make a pressure-resistant protective container of reference numeral 1 having a strength capable of withstanding a pressure of, for example, a depth of 50 m using a material within this thickness. As a countermeasure against this, provide a gas supply device that pressurizes the inside so that the pressure difference between the inside and the outside does not occur so much that the state is always maintained, and a pressure relief that can arbitrarily adjust the pressure difference between the inside and the outside. By providing a device, the inside of the protective container can be constantly pressurized and depressurized in water, which can reduce the pressure-resistant capacity of the pressure-resistant protective container and can withstand deep water depth even if it is made of a thin material. The pressure adjustment pressure-resistant protective container of the code | symbol 23 to be produced is made.

The pressure-adjusted pressure-resistant protective container denoted by reference numeral 23 can exclude water in front of the measurement wave receiving / transmitting part denoted by reference numeral 25. Surrounding the measurement wave receiving / transmitting part of reference numeral 25 with a pressurized waterproof sheet of reference numeral 33, a pressure slightly higher than the outside, for example, 0.03 MPa (generated at a distance from the upper side to the lower side of the reinforcing bar probe) The pressure waterproof seal 33 is pressed against the surface of the concrete structure in the water 11 to stop water by applying a pressure slightly larger than the pressure difference. Further, since the water stop portion is pressurized at a higher pressure than the outside, water hardly enters from the outside. Depending on the material of the pressure waterproof waterproof seal part 34, for example, if it is a soft, rubbery material of about 1 mm, the portion corresponding to the survey surface of the concrete structure 11 of the pressure waterproof seal part 34 is wide. If there is about 3 cm, the surface will stop, so water will hardly enter even if it moves during measurement. Further, by attaching a thin rubber sheet or the like as a measurement auxiliary sheet of reference numeral 24 on the survey surface of the concrete structure of reference numeral 11, the pressure waterproof seal of reference numeral 34 can smoothly slide, and the pressure adjustment pressure resistance protection of reference numeral 23 Measurement can be performed smoothly by moving the container easily.

Reference numeral 23 in the figure denotes a pressure-adjusting pressure-resistant protective container. Reinforcing bar exploration equipment, which is a survey device for the concrete structure with reference numeral 2, can be built in, and in this state, it has a function that allows the inside of the concrete structure with reference numeral 11 to be investigated. Further, the container can be equipped with a device for removing water between the pressurization and decompression device, the survey surface of the concrete structure of reference numeral 11 and the measurement wave receiving / transmitting portion of reference numeral 25 by the water removal method. .

Reference numeral 24 in the figure denotes a measurement auxiliary sheet. The thickness varies depending on the accuracy of the measuring device, but may be any material and thickness that does not hinder measurement. Electromagnetic waves are often used for the measurement waves of the reinforcing bar probe, which is a concrete structure internal inspection device. If there are obstacles, these electromagnetic waves will interfere with the measurement. For example, most of the measuring devices have a measurement failure when there is liquid between the side surface and the measurement wave transmission / reception unit. The more accurate the investigation is, the less influence can be removed by eliminating these obstacles as much as possible. Therefore, in order to eliminate this liquid, a sheet of a flexible material with a thickness that does not affect the measurement, such as a soft rubbery several millimeters. By simply pressing the sheet with the pressure-adjusted pressure-proof protective box 23, water between the sheets can be pushed out from the measuring position to the extent that it does not affect the measurement (for example, softly placed on the concrete surface) When the rubber sheet is pushed and rotated with a roller and moved, water is removed from the surface that is in contact with the roller, and the measurement is currently on the market as long as the transmitter / receiver and the installation surface are wet. Reinforcing bar probe hardly causes measurement errors, and water can be easily removed by using a material that is more slippery between the pressure-resistant protective container surface and the sheet surface). Since adjusting the breakdown voltage protection container it is allowed to easily move over the measuring auxiliary sheet code 24 will be able to easily measure.

FIG. 12 is a conceptual view of a cross section in which a measurement auxiliary sheet is sandwiched between tires coming out from the pressure adjustment pressure-resistant protective container. The figure shows an example in which the outer side of the auxiliary measurement sheet is being investigated while the wheel 26 of the reinforcing bar exploration machine, which is the internal investigation device for the concrete structure of the reference numeral 2, runs and measures the distance.

FIG. 13 is a conceptual view of a cross section in which a tire coming out of a pressure-adjusting pressure-resistant protective container travels through a measurement auxiliary sheet groove and is investigated. The figure of the example of the method of improving workability | operativity by installing the groove | channel which the wheel part of a code | symbol 26 can drive | work to a measurement auxiliary seat is shown. In this way, by changing the shape of the measurement auxiliary sheet of reference numeral 24, water between the pressure adjustment pressure-resistant protective container of reference numeral 23, the survey surface of the concrete structure of reference numeral 11, and the measurement auxiliary sheet of reference numeral 24 is transferred to the reference numeral 23. Investigation can be performed more easily while pressing the measurement wave receiving / transmitting part of reference numeral 25, which is a pressure-adjusting pressure-resistant protective container, to eliminate water.

In the case of measuring equipment that does not need to measure distance data by rotating the tire unlike the above measuring instrument (for example, in the case of a machine that can measure the moving distance by light waves, etc.), install this measurement auxiliary sheet and press it as described above By removing the water, the internal investigation of the concrete structure with the reference numeral 11 in the water is carried out, and the pressure protection container containing the investigation equipment inside the concrete structure with the reference numeral 2 is pressed to remove the water. This is a measurement auxiliary sheet that enables investigation without placing gas between the box or the transmitting / receiving unit and the side of the meter.

Reference numeral 25 in the figure denotes a measurement wave receiving / transmitting unit. It is a protection part of the pressure adjustment pressure-resistant protective container of the code | symbol 23 which transmits or receives the electromagnetic waves etc. of the reinforcing bar probe which can investigate the inside of the concrete structure in water.

Reference numeral 26 in the figure denotes a wheel. In addition to moving the rebar probe and the pressure-adjusted pressure-resistant protective container 23, which is an internal investigation device for the concrete structure of reference 2, the measurement device can read the travel distance data through the shaft by rotating it. It is a wheel with a transmission shaft attached.

Reference numeral 27 in the figure denotes a pressurizing gas supply unit. This is a storage facility for gas to be fed into the pressure-adjusted pressure-resistant protective container denoted by reference numeral 23. Gases to be pressurized include containers brought into the water, air containers held by divers, hoses for sending gas from the land, etc., but are shown as examples of air cylinders brought into the water.

Reference numeral 28 in the figure is a pressure regulator. This is a pressure adjusting machine that adjusts the pressure of the gas sent from the pressurizing gas supply unit 27.

It is the code | symbol 29 measuring instrument gas inflow valve in a figure. This is a valve having a function of further adjusting the gas sent from the pressure regulator of the reference numeral 28 after the pressure is adjusted, and sending it to the pressure-adjusted pressure resistant protective container of the reference numeral 23 with a necessary pressure.

Reference numeral 30 in the figure is a total side gas inlet valve. This is a valve having a function of further adjusting the gas sent from the pressure regulator of reference numeral 28 and feeding it to the metering side pressurizing portion of reference numeral 31 with the required pressure.

Reference numeral 31 in the figure is a total side pressure unit. This is a pressurized space part slightly higher than the outside, which is made by excluding water on the receiving and transmitting part of the pressure-adjusted pressure-resistant protective container 23 and water on the total side of the concrete structure.

Reference numeral 32 in the figure is a pressure relief valve. The pressure-adjusted pressure-resistant protective container denoted by reference numeral 23 is pressurized from a pressurized gas supply section denoted by reference numeral 27. If the pressure-adjusting pressure-resistant protective container 23 is moved in the water surface direction in the pressurized state, the external pressure is reduced, so that the internal pressure becomes higher than the external pressure. It is a valve having a function of keeping the pressure difference of the pressurization adjustment pressure-resistant protective container of reference numeral 23 constant by releasing the pressure higher than the strength setting to the outside.

Reference numeral 33 in the figure is a safety valve. This is a spare valve in the event of a failure of the pressure relief valve 32, which prevents the pressure adjustment pressure protective container 23 from being destroyed.

Reference numeral 34 in the figure denotes a pressurized waterproof seal. It is attached around the measurement receiving / transmitting part of the reference numeral 25 of the pressure-adjusted pressure-resistant protective container of the reference numeral 23, and excludes water between the measurement wave receiving / transmitting part of the reference numeral 25 and the survey surface of the concrete structure of the reference numeral 11. It is made of a gas-impervious material with elasticity and flexibility at the seal part that prevents water from entering. For example, rubber-like material is soft, wide and elastic, and has a side pressure of 31 It has a structure capable of stopping water by receiving a higher pressure from the inside of the part than the outside. Since the internal pressure is slightly higher than the outside, water can be excluded from the lower part of the measuring instrument, and since a space with a higher pressure than the outside is created, the intrusion of water can be prevented. Furthermore, the portion of the pressurized waterproof seal that is in contact with the concrete surface is wide and serves as water stoppage. For this reason, even when moving, there is almost no water immersion, and when used together with the measurement auxiliary sheet of reference numeral 24, it has a water stop effect and a function that facilitates measurement by improving sliding during movement.

The code | symbol 35 in a figure is a pressurization part drain valve. It is a valve which excludes the water in the measurement surface pressurization part of the code | symbol 31, and the sent-in gas outside. In the figure, two places are provided because the place where water is removed changes depending on the usage form of the pressure-adjusted pressure-resistant protective container denoted by reference numeral 23. This number can be changed depending on the use situation. This pressurized drain valve has a function of adjusting the drain pressure so that the internal pressure can be increased so that water does not enter from the outside during measurement. For example, the valve is controlled using a spring or spring, and pressure is applied to the drain to increase the internal pressure. Moreover, the internal pressure of the side surface pressurization part of a code | symbol 31 can be raised by lengthening a drain outlet with a hose etc. and installing it collectively below the pressurization adjustment pressure-resistant protective container of the code | symbol 23. FIG. Depending on the position of the valve, the measurement surface pressurizing unit 31 can maintain a constant pressure difference even if a slight pressure change occurs. The repulsive force generated when the internal pressure increases is, for example, in the case of a pressure-adjusted pressure-resistant protective container of reference numeral 23 having a receiving and transmitting part of reference numeral 25 having a size of 20 cm × 20 cm, the gap distance is 2 cm, which is higher than the outside. If the pressure is 1.03 MPa, the volume is 800 cc, which is about 1 kg of buoyancy of 1.03 times the volume and about 1 kg of repulsive force. It is easy to operate the container. In the figure, it is shown with a structure that suppresses the drain valve.

Reference numeral 36 in the figure denotes an axle waterproof seal portion. This is an improvement of the axle part of a general-purpose rebar exploration machine, which is a concrete structure internal inspection device indicated by reference numeral 2, in the pressure adjustment pressure protection container indicated by reference numeral 23. It is a waterproof seal part of the axle part extended outside. Such a waterproof seal usually has an O-ring seal structure, and can be easily rotated while waterproofing even under pressure, and is highly reliable and generally used.

12 and 13 are a pressure-adjusting pressure-resistant protective container of reference numeral 23 without a measuring surface pressurizing unit device, and using a measurement auxiliary sheet of reference numeral 24 to conduct an internal investigation of a concrete structure by removing water. It is a conceptual diagram. In this case, the measurement auxiliary sheet 24 is made of a material that does not interfere with the measurement, is made of a material having thickness and flexibility and strength that can almost eliminate water only by pressing, and pressure adjustment pressure resistance protection of code 23 It is the figure showing the method of draining and investigating the water between a container and the concrete surface of an investigation position to such an extent that it does not affect a measurement part.

FIG. 12 is a conceptual diagram in which a measurement auxiliary sheet denoted by reference numeral 24 is sandwiched between tires coming out of the pressure adjustment pressure-resistant protective container. Reinforcing bar probe, which is a concrete structure internal inspection device of reference number 2 capable of performing internal inspection of a concrete structure of reference number 11 in water, is a pressure-adjusted pressure-resistant protective container of reference number 23 without a measuring surface pressurized drainage device. And press against the part where the measurement auxiliary sheet 24 is installed, and water so that almost no water enters between the pressure adjustment pressure-resistant protective container 23 and the measurement auxiliary sheet 24. The pressure-adjusted pressure-resistant protective container of reference numeral 23, which can be moved and investigated while the wheel of reference numeral 26 is measured on the concrete structure of reference numeral 11 next to the auxiliary measurement sheet of reference numeral 24. It is a conceptual diagram of the system which moves while rotating so that the distance of time can be calculated and inspects the inside of concrete.

FIG. 13 is a conceptual diagram in which the tire coming out of the pressure-adjusted pressure-resistant protective container travels through the measurement auxiliary sheet groove and is investigated. Reinforcing bar exploration machine, which is an internal investigation equipment for the concrete structure of code 2 that can conduct an internal investigation of the concrete structure of code 11 in the water, is a pressure-adjusted pressure-resistant protective container of code 23 without a measuring surface pressurized drainage device. And press against the part where the measurement auxiliary sheet 24 is installed, and water so that almost no water enters between the pressure adjustment pressure-resistant protective container 23 and the measurement auxiliary sheet 24. The pressure-adjusted pressure-resistant protective container of reference numeral 23 that can be moved and investigated while removing the wheel, and the wheel of reference numeral 26 on the measurement auxiliary sheet traveling groove of reference numeral 37 in the measurement auxiliary seat of reference numeral 24 at this time However, it is a conceptual diagram of a method of moving inside while rotating so that the distance can be calculated and conducting an internal investigation of concrete

Reference numeral 37 in FIG. 13 denotes a measurement auxiliary seat travel groove. The measurement of the reference numeral 24 is performed so that the reference numeral 23 of the pressure-adjusting pressure-resistant protective container used for the internal investigation of the concrete structure of the reference numeral 11 is in close contact with the measurement auxiliary sheet of the reference numeral 24 so that the wheel of the reference numeral 26 can easily travel. It is the part of the groove | channel for driving processed into the auxiliary sheet. As a result, it is possible to easily travel on the measurement auxiliary sheet 24 and to investigate it.

The internal investigation of underwater concrete structures that could hardly be done so far can be easily performed, so that it can greatly contribute to the maintenance and repair of underwater structures.

DESCRIPTION OF SYMBOLS 1 Pressure-resistant protective container 2 Concrete structure inside investigation equipment 3 Enclosure box 4 Fixed anchor 5 Air part 6 in the enclosure 6 Diver 7 Underwater video camera 8 Monitor television 9 Cable of wired investigation equipment 10 Monitor controller of wired investigation equipment DESCRIPTION OF SYMBOLS 11 Concrete structure 12 Bottom part of the aerial part in the water made in the enclosure 13 Enclosure 14 provided with the investigation room and the sub room Investigation room 15 Sub room 16 Door 17 between the sub room and the investigation room Water supply / drainage equipment 19 in the survey room Water supply / drainage equipment 20 in the sub chamber Water leakage countermeasure enclosure 21 Pressure relief device 22 Pressure equalizing device 23 Pressure adjustment pressure-resistant protective container 24 Measurement auxiliary sheet 25 Measurement wave reception Transmitter 26 Wheel 27 Gas supply unit for pressurization 28 Pressure regulator 29 Gas inflow valve 30 in measuring instrument Side gas inflow valve 31 Side surface pressurization unit 32 Pressure relief valve 33 The valve 34 pressurized 圧防 water seal 35 pressing drain valve 36 axle waterproof seal portion 37 measured auxiliary sheet running groove

Claims (1)

Concrete underwater using a pressure-resistant protective container that houses an electromagnetic radar type concrete internal investigation device that can be investigated while traveling on the investigation target surface of a concrete structure and that can travel on the investigation target surface together with the investigation device A method of investigating the inside of a structure, wherein a rubbery measurement auxiliary sheet is attached to either or both of the investigation object surface in water and the electromagnetic wave receiving / transmitting part of the pressure-resistant protective container, and the investigation When the pressure-resistant protective container integrated with the device is surveyed while traveling on the surface of the concrete structure, it is moved between the survey surface and the pressure-resistant protective container by traveling while pressing the measurement auxiliary sheet with the protective container. A method for investigating the interior of a concrete structure in water, characterized by eliminating water.

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