JP2014218886A - Survey and repair method for concrete structure facing narrow expansion gap - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a survey and repair method for a concrete structure facing a narrow expansion gap that can make a proper survey of flaw detection on an end of the concrete structure utilizing its narrow expansion gap and also make necessary repairs.SOLUTION: A survey and repair method for a concrete structure facing a narrow expansion gap comprises the steps of: arranging a supporting and moving means 22 for a survey unit 1 which supports and moves the survey unit in the narrow expansion gap 82; moving the survey unit 1 along a survey object surface S in a horizontal direction and in a vertical direction, and acquiring data associated with a surface and/or internal state thereof; analyzing the data on the spot or at a distance from the spot artificially or by using an analyzing device, diagnosing the analytic result, and specifying whether a repair is needed, and a repair object part and repair contents; and making the repair of the specified contents on the specified repair object part.

Description

  The present invention relates to a method for investigating and repairing a concrete structure facing a narrow gap, and more specifically, for example, an end of a concrete structure such as an end of a bridge girder on an elevated road, and a narrow gap between them. It relates to a method for performing flaw detection investigations and necessary repairs and treatments.

  In many elevated roads, a telescopic device is placed at the connection between the floor slab and the abutment that receives the floor slab, and the narrow gap between the end surface of the floor slab and the vertical surface of the abutment that is opposed to this is blocked. . However, water leakage from the telescopic device into the narrow gap is inevitable, and the leakage or the like causes deterioration and damage to the end of the beam. In particular, a lot of salt is contained in the antifreeze agent that is sprinkled on the road surface, and the salt mixes in the leaked water and penetrates into the concrete and corrodes the internal rebar.

When such a situation occurs, it is necessary to repair the bridge girder ends. Specifically, the following work is required.
・ Removal of styrofoam and other foreign materials existing in narrow gaps ・ Surface treatment of concrete ・ Identification of deteriorated parts and repair areas ・ Removal of deteriorated concrete, measurement of suspension depth and application of rust preventive agent to reinforcing bars ・ Refilling of repair materials Repair of missing concrete cross-section by surface coating ・ Application of surface impregnating agent and surface coating material to prevent ingress of deterioration factors

  By the way, the gap between the end of the bridge girder and the abutment is very narrow, 2-5 cm. In order to carry out many operations as described above for such a narrow gap, the main line (lane) It is necessary to carry out from the road after carrying out traffic regulation. Therefore, traffic congestion was inevitable during the survey and repair work.

  Conventionally, as in the case of the present invention, a proposal has been made for a method for repairing the end portion of a bridge girder (Patent Document 1: Japanese Patent Application Laid-Open No. 2006-161314). The construction method is roughly as follows: “The concrete surface layer on the lower surface of the end of the concrete floor slab is peeled over the required band by high-pressure water injection by a water jet device, and has bending elasticity within the longitudinal clearance of the end surface of the concrete floor slab. Insert the template, install a mold frame that covers the lower open surface of the chip band, abut the front end surface of the mold frame against the surface of the template, and defined by the template and the mold frame The repair zone is filled with repair cement mortar, and after the repair cement mortar is hardened, the mold is removed and the template remains. "

  However, the construction method according to this proposal is based on the premise that construction is performed from the back side of a concrete slab with a relatively wide gap, and the narrow gap assumed in the present invention, that is, the width is 2 It is not applicable to a narrow gap of about 5 cm. Of course, the molds and jigs used there are not configured to be applicable to narrow gaps having a width of about 2 to 5 cm. In addition, there is no description regarding the flaw detection survey specialized in narrow play that should be performed prior to repair work.

JP 2006-161314 A

  As mentioned above, conventionally, investigation and repair work of bridge girder ends, etc., where the surrounding gap is a narrow gap with a width of about 2 to 5 cm had to be performed from the road, so traffic regulation is necessary. Traffic congestion during construction was inevitable. In addition, the conventionally proposed repair method for the bottom surface of the concrete floor slab is not applicable to narrow play with a width of about 2 to 5 cm, and further, flaw detection investigation specialized for narrow play prior to repair work. No proposal was made regarding.

  The present invention has been made under such a background. For example, the end of a concrete structure such as an end of a bridge girder of an elevated road that has only a narrow gap of about 2 to 5 cm in width around the narrow gap is provided. Providing a survey and repair method for concrete structures facing narrow gaps, which makes it possible to conduct property surveys (mainly corrosion surveys due to salt damage) and to perform appropriate repairs based on the survey results Is an issue.

The invention described in claim 1 for solving the above-described problem is to investigate the end of a concrete structure having a narrow gap around the periphery using the narrow gap, and perform necessary repairs based on the result of the investigation. It is a construction method for
-A survey unit setting step for arranging a unit support / moving means for moving in the narrow gap while supporting the survey unit in the narrow gap;
A survey / data acquisition step of moving the survey unit in the horizontal direction and the vertical direction along the survey target part, and acquiring data on the surface and / or internal properties;
-Analyzing the acquired data on the spot or in a place away from the site artificially or using an analysis device, judging whether or not repair is necessary based on the analysis result, and determining the repair target part and repair contents. A diagnostic process to identify;
-A repair process for repairing the specified content for the repair target part specified in the diagnosis process;
It is an investigation and repair method for concrete structures facing the narrow gap characterized by comprising

  In one embodiment, the investigation / data acquisition step includes an appearance investigation by a camera unit, a salt content investigation by collecting a sample, a sound investigation by a sound collection unit, and a natural potential by a natural potential measuring device. Including surveys.

  In one embodiment, the repairing process includes a concrete suspending process, a suspending depth measuring process, a rust preventive agent applying process to a reinforcing bar, a formwork setting process, a cross-section repair process, a formwork removal process, and a post-repair surface treatment. Process.

  In one embodiment, a filler removal step is included before the investigation and data collection step, and the RC is used to confirm the position of the reinforcing bars prior to the collection of the sample in the investigation of the salt content contained in the sample. Use a radar.

  In one embodiment, the suspended depth is measured by using a laser distance meter and refracting the laser beam toward the suspended portion by a deflection mirror disposed in the narrow gap.

  In one embodiment, the mold frame is provided with a holding air balloon on the back side of the regulation surface that presses the regulation surface facing the repair target surface from behind to hold the entire mold frame in a normal position. A peeling air balloon into which air is introduced when the mold is removed is provided on the regulation surface. Further, the mold frame is provided with a sponge seal frame that can surround the repaired portion on the regulation surface.

  In one embodiment, the unit supporting / moving means includes a pair of wire conveying means provided outside the narrow gap across the investigation target portion in the narrow gap, and the survey unit is fixed in the middle. A horizontal movement mechanism comprising wires passed between the wire conveying means, a pair of racks vertically arranged outside the narrow gap across the investigation target portion in the narrow gap, and the wire conveying means It is a wire moving system comprising a combination of an elevating mechanism comprising a pinion that is deployed and meshes with the rack, and a rotation driving means for the pinion.

  In a preferred embodiment, a position information display device for detecting the position of the investigation unit is installed in the pair of wire conveying means.

  The present invention is as described above, and the investigation / repair or processing of the end of the concrete structure such as the end of a bridge girder of an elevated road having a narrow gap of about 2 to 5 cm in width is investigated, repaired or processed. Can be appropriately performed by introducing the unit having the function of the unit into the narrow gap through the unit support / moving means, and since those operations can be performed from the side of the concrete structure, There is an effect that it is not necessary to apply traffic regulations during the work.

  In the inventions according to claims 7 to 9, the regulating surface is not displaced because it is held down by the holding air balloon from the back when supplying the restoration material, and at that time, air escapes from the air vent hole, Further, since the sponge seal frame 57 acts to suck and discharge, the repair portion does not include air bubbles, and a repair surface having a regulated surface is created. With this, there is an effect that mold release becomes easy.

  In the inventions according to claims 10 and 11, there is an effect that unit support / moving means which can be suitably used for investigation, repair and other various work in the narrow gap is obtained.

It is a figure which shows the investigation unit setting process in the investigation and repair method of the concrete structure which faces the narrow play concerning this invention. It is a schematic diagram which shows the position confirmation method of the reinforcing bar in the investigation and repair method of the concrete structure which faces the narrow play concerning this invention. It is a perspective view which shows an example of the unit support and moving means used in the investigation and repair method of the concrete structure which faces the narrow play concerning this invention. It is a middle abbreviation front view showing another example of the unit support and movement means which can be used in the investigation and repair method of the concrete structure facing the narrow play according to the present invention. It is a middle abbreviation top view which shows another example of the unit support and movement means used in the investigation and repair method of the concrete structure which faces the narrow play concerning the present invention. It is a schematic diagram which shows the filler removal process in the investigation and repair method of the concrete structure which faces the narrow play concerning this invention. It is a perspective view which shows an example (camera unit) of the investigation unit used in the investigation and repair method of the concrete structure which faces the narrow play concerning this invention. It is the top view and front view which show another example (hitting sound collection unit) of the investigation unit used in the investigation and repair method of the concrete structure which faces the narrow play concerning this invention. It is a front view which shows another example (natural potential measuring device) of the investigation unit used in the investigation and repair method of the concrete structure which faces the narrow play concerning this invention. It is a contour map which shows the corrosion state of the reinforcing bar in the investigation object part measured by the natural potential measuring device in the investigation and repair method of the concrete structure facing the narrow play according to the present invention. It is a front view which shows the example (water jet nozzle) of the unit for repair used in the investigation and repair method of the concrete structure which faces the narrow play concerning this invention. It is a schematic diagram which shows the 1st step of the hanging process in the investigation and repair method of the concrete structure which faces the narrow play concerning this invention. It is a schematic diagram which shows the 2nd step of the suspension process in the investigation and repair method of the concrete structure which faces the narrow play concerning this invention. It is a schematic diagram which shows the hanger depth measuring method in the investigation and repair method of the concrete structure which faces the narrow play concerning this invention. It is a schematic diagram which shows the form setting process in the investigation and repair method of the concrete structure which faces the narrow play concerning this invention. It is the front side and back side perspective view which shows the structure of the formwork used in the investigation and repair method of the concrete structure which faces the narrow play concerning this invention. It is a longitudinal cross-sectional view which shows the form installation condition in the investigation and repair construction method of the concrete structure which faces the narrow play concerning this invention. It is a schematic diagram which shows the restoration | restoration material supply process in the investigation and repair method of the concrete structure which faces the narrow play concerning this invention. It is a schematic diagram which shows the restoration material supply completion process in the investigation and repair method of the concrete structure which faces the narrow play concerning this invention. It is a schematic diagram which shows the 1st process of the repair surface post-processing work in the investigation and repair method of the concrete structure which faces the narrow play concerning this invention. It is a schematic diagram which shows the 2nd process of the repair surface post-processing work in the investigation and repair construction method of the concrete structure which faces the narrow play concerning this invention.

  A mode for carrying out the present invention will be described with reference to the accompanying drawings. The construction method according to the present invention is not limited, but mainly covers the ends of concrete structures that have only a narrow gap of about 2 to 5 cm, such as the end of a bridge girder on an elevated road. However, the following explanation is about the investigation and repair of the bridge girder ends, but the same applies to other concrete structures.

The investigation and repair method for concrete structures facing the narrow play according to the present invention is as follows.
-A survey unit setting step for arranging a unit support / moving means for moving in the narrow gap while supporting the survey unit in the narrow gap;
A survey / data acquisition step of moving the survey unit in the horizontal direction and the vertical direction along the survey target part, and acquiring data on the surface and / or internal properties;
-Analyzing the acquired data on the spot or in a place away from the site artificially or using an analysis device, judging whether or not repair is necessary based on the analysis result, and determining the repair target part and repair contents. A diagnostic process to identify;
-A repair process for repairing the specified content for the repair target part specified in the diagnosis process;
It is characterized by comprising. Hereinafter, each process will be described in more detail with reference to the drawings.

Survey unit setting process The construction method according to the present invention is roughly classified into a preparation process, a survey / diagnosis process, and a repair process. The survey unit setting process and the filler removal process described later belong to the preparation process. This investigation unit setting step is a step of carrying in and setting the investigation unit 1 necessary for investigating the surface and internal properties of the investigation target surface S in the narrow gap 82 existing around the investigation target surface S.

  There are various types of survey units 1 used in the present invention, and unit support / moving means described later includes a utility head 24 having versatility for mounting these various types of survey units 1. It is said. The utility head 24 is composed of, for example, a unit mounting plate and a frame disposed on the side thereof. The unit supporting / moving means provided with the utility head 24 is not limited to the deterioration range investigation with the investigation unit 1 mounted, but also foreign matter (such as polystyrene foam) existing in the narrow gap with the unit corresponding to the purpose. ) Removal, surface treatment of concrete inside the narrow gap (roughening), investigation of degradation range, concrete suspension, application of reinforced anticorrosive agent, investigation of deterioration prevention measures after cross-section repair, repair, treatment, etc. It can be used for work.

  The survey unit 1 is supported by the unit support / moving means and moves in the narrow gap 82 along the survey target surface S in the X-axis direction and the Y-axis direction. Various means for supporting the investigation unit 1 in the narrow gap 82 and moving it in the X-axis direction and the Y-axis direction are conceivable. For example, a configuration in which the guide rail 21 is laid on the upper surface of the abutment 81 under the narrow gap 82 and jacks 22 and 23 (see FIGS. 1 and 2) as lifting means are arranged on the guide rail 21 so as to be able to travel is considered. It is done. As the jacks 22 and 23, screw type, air type, hydraulic type or electric pantograph jacks are suitable. In addition, the jacks 22 and 23 referred to here include a type generally called a table lift.

  In the case of the example shown in FIG. 1, it is not shown between the motor 21 a installed at the upper surface end of the abutment 81 outside the narrow gap 82 and the folded portion 21 b installed at the opposite end of the upper surface of the abutment 81. A wire is passed and connected to the jack 22. Thus, the jack 22 moves back and forth on the guide rail 21 as the wire is driven forward and backward by the motor 21. The example shown in FIG. 2 can also be configured similarly. Thus, without laying the guide rail 21, it is possible to attach a wheel to the jacks 22 and 23 so that the vehicle can run on its own. In any of these cases, the survey unit 1 is installed on the utility head 24 disposed on the upper surfaces of the jacks 22 and 23.

  Further, as another unit supporting / moving means, a traveling body 25 is arranged on the guide rail 21 laid as described above, and a pair of intermediate parts are connected via a connecting rod 26 to form a parallel link. A configuration in which the swing arms 26a and 26b are pivotally mounted can be employed (see FIG. 3). In this case, the survey unit 1 is installed on the utility head 24 disposed on the upper surfaces of the pair of swing arms 26a and 26b. In this case, for example, the traveling body 25 can travel on the guide rail 21 by the same method as described with reference to FIG. 1 (movement in the X-axis direction). Further, the utility head 24 (investigation unit 1) can be moved up and down (moved in the Y-axis direction) by swinging the pair of swing arms 26a and 26b by the action of the cylinder 28 provided on the traveling body 25. .

  Further, as another unit support / moving means, a wire moving system configured by combining a horizontal moving mechanism that supports the survey unit 1 and moves it horizontally and an elevating mechanism that moves the moving mechanism up and down can be adopted. (See FIGS. 4 and 5).

  The horizontal movement mechanism in this case includes, for example, a pair of wire conveying means 31 and 31a that are opposed to the outside of the narrow gap 82 across the investigation target surface S, and the investigation unit 1 is fixed in the middle and the wire conveying means 31 and It consists of the wire 32 passed between 31a. Further, the elevating mechanism is provided in, for example, a pair of racks 33 and 33a that are vertically opposed to the outside of the narrow gap 82 across the surface S to be investigated in the narrow gap 82, and the wire transfer means 31 and 31a. Pinions 34 and 34a meshing with the racks 33 and 33a, respectively, and rotation driving means (for example, lifting handles 35 and 35a or motors) of the pinions 34 and 34a are included.

  The wire 32 is an endless one that is wound around the driving pulley 36 on the wire conveying means 31 side and the driven pulley 36a on the wire conveying means 31a side, and the investigation unit 1 is fixedly supported on the upper portion during the operation. An attachment jig 37 (utility head 24) to be attached is attached. The driving pulley 36 is appropriately provided with driving means. The driving means in the illustrated example is a hand-operated wire moving handle 38, and a rotational driving force transmission belt is wound around the handle shaft and the shaft of the driving pulley 36.

  In the case of this wire moving system, since the pulley 36 can be rotationally driven by turning the wire moving handle 38 to move the wire 32 forward and backward, while moving the investigation unit 1 in the horizontal direction by the handle operation, Searching at the height can be performed. Further, by operating the lifting handles 35 and 35a to rotate the pinions 34 and 34a, the entire horizontal movement mechanism can be moved up and down along the racks 33 and 33a. It is possible to change this. In a preferred embodiment, a position information display device (position meter) 39 for detecting the position of the investigation unit 1 is installed on each handle shaft of the lifting handles 35, 35 a and the wire moving handle 38.

  In addition, although the raising / lowering operation | movement and horizontal movement operation | movement in the wire movement system of the example mentioned above are the structures by manual operation, either one or both of raising / lowering operation | movement and horizontal movement operation | movement can also be made into a mechanical drive. For this purpose, for example, a motor for rotationally driving the pulley 36 is disposed instead of providing the wire moving handle 38, and a motor for rotationally driving the pinions 34, 34a is disposed instead of providing the lifting handles 35, 35a. And these motors may be operated in synchronization with each other.

  As described above, each unit support / moving means can be used as a means for supporting / moving the repair equipment in the narrow gap 82 in the subsequent repair process. In such a case, the inspection unit 1 is removed. At this time, only the survey unit 1 can be removed, and the supporting / moving means can be used as it is.

In the case of the bridge beam end 80 of the filler removal process , a narrow gap 82 is formed between the side surface and the vertical surface of the abutment 81, and the upper end of the narrow gap 82 is closed by the expansion / contraction device 83. The side is filled with a filler 84 such as expanded polystyrene (styrofoam) (see FIG. 6). Therefore, it is necessary to remove the filler 84 before setting the survey unit 1. The removal of the filler 84 can be performed by water injection using the injection device 85.

Investigation / Data Acquisition Process After the filler 84 is removed, the surface and internal properties of the surface to be investigated S and the deterioration are investigated. The survey unit 1 is for conducting a property survey and a degradation survey, and various types of units can be used. The order of investigation is not particularly limited. For example, the appearance investigation by the camera unit, the salt content investigation, the sound investigation by the sound collection unit, and the natural potential measurement investigation by the natural potential measuring device are performed in this order.

<Appearance survey using camera unit>
As the survey unit 1, for example, an irradiation unit 3 such as an LED, a deflection mirror 4 for deflecting the irradiation direction by the irradiation unit 3 toward the survey target surface S, and the survey target surface S projected on the deflection mirror 4 It is possible to use a camera unit 2 in which one or a plurality of CCD cameras 5 for photographing a map are housed in a thin case 6 (which can be substituted by the utility head 24) that can move in the narrow gap 82 (FIG. 7). reference).

  Information obtained when the investigation unit 1 is the camera unit 2 includes surface deformation of the investigation target surface S (for example, occurrence of fine cracks and floating due to corrosion of internal rebar), partial collapse, etc. It is the image data regarding the surface property of. The image data acquired by the camera unit 2 is sent to analysis / display means arranged outside the narrow gap 82, and is appropriately processed and displayed in a visually observable form for evaluation. In addition, this image data is transmitted to a remote place via a public communication network, or recorded on a portable data recording medium and sent to a remote place, where it is evaluated personally, and if necessary Analyze using an analyzer as appropriate. The same applies to the survey unit described below.

<Survey of salt content>
This survey is a survey of the salinity content in the survey target part, which is necessary for specifying the repair target part and the repair contents. This investigation is carried out by drilling the investigation target surface S with a drill and collecting a sample. In order to prevent damage to the reinforcing bar T during drilling, the location of the reinforcing bar T is confirmed in advance. It will be necessary.

  The presence position of the reinforcing bar T can be confirmed using the RC radar 41, for example. The RC radar 41 transmits electromagnetic waves inward from the surface of the concrete, and receives reflected signals from foreign objects such as reinforcing bars and pipes that have different electrical characteristics from the concrete, thereby removing the foreign substances in the concrete. It is a device for exploration. The RC radar 41 searches for reinforcing bars by moving the RC radar 41 in the gap 82a between the lower surface of the bridge girder end 80 and the upper surface of the abutment 81. In general, the RC radar 41 causes the traveling body to travel. However, since it is configured to transmit an electromagnetic wave downward, in this case, the vehicle is searched from the lower surface of the bridge beam end 80 by traveling in the upside down direction (see FIG. 2).

<Sound investigation by sound collection unit>
As another investigation unit 1, a rolling element 9 that abuts and moves along the investigation target surface S to generate a rolling sound and a sound collecting microphone 10 that picks up the rolling sound are arranged in a narrow space 82. A sound collection unit 7 incorporated in a slender and long frame case 8 (which can be substituted by the utility head 24) that can move can be used (see FIG. 8). In this case, the rolling element 9 is rotatably installed in one half of the frame case 8, and the receiving roller 11 corresponding to the rolling element 9 is rotatably installed in the other half of the frame case 8.

  Further, an urging roller 12 is provided at the front and rear portions of the frame case 8 for reliably bringing the rolling element 9 into contact with the surface S to be examined. For example, the urging roller 12 is assumed to move up and down via a torsion coil spring 13, and is in an uplifted state (see the solid line in FIG. 8B) by the action of the torsion coil spring 13 when no load is applied. When the urging roller 12 receives a pressing force exceeding the spring pressure of the torsion coil spring 13 from the wall surface by being inserted into the narrow gap 82, the prone state (see the phantom line in FIG. 8B) Become. In this lying state, the frame case 8 is strongly pressed toward the inspection target surface S by the restoring force of the torsion coil spring 13, so that the rolling element 9 always comes into contact with the inspection target surface S without fail, and the flaw detection work Continue to produce appropriate tapping sound.

  The information obtained in the case of the sound collection unit 7 is a sound reflecting the deterioration state inside the surface S to be investigated, that is, the float and separation inside the concrete (both are caused by corrosion of the rebar due to salt damage). It is data. In this case, the sound data of the hitting sound acquired through the sound collecting microphone 10 is directly listened to by the person in charge on the spot, or recorded on a recording medium for artificial evaluation. In addition, the voice data is transmitted to a remote place through a public communication network, or is recorded on a portable voice data recording medium and sent to a remote place, where it is evaluated personally, or an analysis device is appropriately used. Sometimes used to analyze.

<Study on natural potential measurement using a natural potential measuring device>
Still another survey unit 1 is a natural potential measuring device using a small reference electrode that detects the degree of corrosion of reinforcing bars in concrete. This natural potential measuring apparatus uses an electrochemical method for diagnosing corrosion from the potential of the reinforcing bar surface that changes as the reinforcing bar corrodes, and is generally used widely. FIG. 9 shows a configuration example of the natural potential measuring device 14 having a configuration suitable for use in the present invention, which is disposed on the utility head 24, the small verification electrode 15, and the electrode end. A unit comprising a measuring sponge 16, a small air cylinder 17 that acts to press the measuring sponge 16, and a water spray nozzle 18 that sprays water on the investigation target part is assembled and covered with a cover 19. .

  In the case of the natural potential measuring device 14, the cover 19 is arranged with the investigation target portion side so that the measurement sponge 16 is in contact with the investigation target surface S. At that time, the measuring sponge 16 is pressed by the small air cylinder 17 and bulged toward the investigation target surface S, so that the measurement sponge 16 is surely brought into contact with the investigation target surface S. Thus, the natural potential measuring device 14 moves with the movement of the utility head 24, and the natural potential of the investigation target portion is measured by the small verification electrode 15 through the measuring sponge 16. FIG. 10 is a contour diagram showing the corrosion state of the reinforcing bar in the investigation target portion measured by the natural potential measuring device 14, and the hatched portion in the drawing represents the corrosion portion.

  In addition to the above, there are various investigation units for exploring the surface or the inside of a concrete structure, but it can be adopted as long as it is a size that fits within the narrow gap 82, and not only one type but also a plurality of types. It goes without saying that things can be used together.

Diagnosis step Next, the data obtained in the above survey / data acquisition step is artificially evaluated, or analyzed using an analysis device installed at the site or an analysis device located at a remote location, and the result. , Whether or not the surface S to be surveyed is in a state to be repaired immediately, the range of the surface S to be repaired (identification of the site to be repaired), and how much repair should be performed (concrete Diagnosis of whether or not the cross-sectional repair is necessary completely or partially, and whether or not the surface treatment is sufficient).

Repair process Next, repair work is performed based on the diagnosis result in the above-described diagnosis process. When the degree of repair is sufficient only for the concrete surface treatment, a surface coating or the like is appropriately performed. In addition, when full or partial cross-section repair is required, concrete hang-up work, hang-up depth measurement work, application of rust inhibitor to reinforcing bars, form setting work, cross-section repair work, form removal Work and post-repair work are performed in this order. Hereinafter, each work process will be described in detail.

<Concrete lifting process>
It is recommended that the lifting work be performed by the water jet method using ultra-high pressure water. In the case of this water jet method, there is an advantage that the working environment can be improved because there are no micro cracks in the concrete and there is no problem of dust generation or vibration. Depending on the degree of damage, the cross-section repair may be a full cross-section repair or a partial cross-section repair. In the case of full-section restoration, since the suspension operation can be performed from the side, a commercially available water jet nozzle can be used (adjusting the nozzle ejection angle, etc., if necessary), but partial cross-section restoration. In this case, since the lifting work needs to be performed in the narrow gap 82, a commercially available water jet nozzle cannot be used.

  Therefore, in the present invention, in order to carry out this water jet method, a small-sized water jet nozzle 43 that fits in the narrow gap 82 is prepared. The water jet nozzle 43 has one or a plurality of jet injection holes 43a facing the surface to be suspended (see FIG. 11), and is inserted into the narrow gap 82 to allow ultrahigh pressure water to flow toward the surface to be suspended. By spraying, the concrete at that location is partially destroyed. When the salinity content of the repair target portion is large, the rebar T is exposed until it is exposed (see FIGS. 12 and 13). In that case, an air balloon 44 is arranged at the upper part in the narrow gap 82 in order to reliably prevent dust that may be generated during the lifting work from scattering on the main road. It may be blocked.

<Hassing depth measurement process>
In order to confirm the hanger depth determined from the investigation / diagnosis results and to set the supply amount of restoration material for repair, the hanger depth is measured after the hanger work is completed. The measurement of the hanger depth can be performed using a laser distance meter 45, for example. In this case, the laser distance meter 45 is disposed outside the narrow gap 82, and a mirror unit 46 having a pair of refracting mirrors in a square shape and a target plate 47 in the center is disposed in the narrow gap 82 (see FIG. 14). The laser distance meter 45 is installed so as to be movable in parallel with the narrow gap 82 outside the narrow gap 82, and the mirror unit 46 is suspended by a wire 47 that moves in the vertical direction so that it can move up and down and move laterally. Is done.

  In such a configuration, three laser beams L <b> 1 to L <b> 3 are emitted from the laser distance meter 45 toward the narrow gap 82. Of these, the middle laser beam L3 hits the target plate 47 and returns to the laser distance meter 45, but the distance from the laser distance meter 45 to the mirror unit 46 can be known from the round-trip time. Further, the pair of left and right laser beams L1 and L2 go straight and hit the refracting mirror and refract in the opposite directions, respectively, and one laser beam L1 hits the suspension surface 48 of the repair target part and reflects, hits the refracting mirror and laser distance meter Returning to 45, the other laser beam L2 hits the side surface of the abutment 81 facing the surface S1 to be repaired, and similarly returns to the laser distance meter 45.

  And the depth of the suspension surface 48 can be calculated from the difference between the measured values before and after the suspension for the time when the laser beams L1 and L3 are reflected from the target surface and returned. By repeating this operation while moving the laser distance meter 45 laterally and moving the mirror unit 46 up and down and laterally, it is possible to measure the depth over the entire area of the suspension surface 48.

<Rust preventive spraying process for reinforcing bars>
In the above case, when the reinforcing bar T is exposed by the fishing, a paste-like rust preventive is sprayed on the reinforcing bar T before supplying the repairing material to the repair site. The rust preventive is preferably sprayed to the back side of the reinforcing bar T using, for example, a Y-shaped multi-directional spray nozzle having a plurality of jet outlets facing in different directions.

<Formwork setting process>
Next, the mold 51 is inserted and installed from the side into the narrow gap 82 (see FIG. 15). The mold 51 used in the present invention has an L-shaped cross section, and preferably faces the repair target surface S1. A holding air balloon 53 for holding the mold 51 in a normal position is provided on the back side of the regulating surface 52, and the mold 51 is placed on the regulating surface 52 and / or the horizontal portion 54 after the repair work is completed. It is assumed that a peeling air balloon 55 for peeling from the repair surface is provided (see FIGS. 16 and 17).

  An air hose extending from the compressor via an on-off valve is connected to the holding air balloon 53 and the peeling air balloon 55 to supply and discharge air. Typically, the air hose 56 for supplying and discharging air to and from the holding air balloon 53 and the air hose 56 a for supplying and discharging air to and from the peeling air balloon 55 are separate systems. Although it is performed independently, in some cases, this may be a single system, and the holding air balloon 53 and the peeling air balloon 55 may be connected via an on-off valve.

  The mold 51 is provided with an injection hose 58 extending through the restriction surface 52 and extending onto the horizontal portion 54, and an air vent hole 60 extending from the restriction surface 52 to the back surface is provided at the top of the mold 51. . Preferably, a sponge seal frame 57 having a size capable of enclosing the repair portion is provided from the regulation surface 52 to the horizontal surface 54 to prevent the repair material from leaking out when the repair material is injected. The injection hose 58 is opened at the lower part in the seal frame 57, and the air vent hole 60 is opened at the upper part in the seal frame 57.

  In the case of the mold 51 having such a configuration, after being introduced into the narrow gap 82 from the side, the regulation surface 52 is applied to the surface S1 to be repaired so as to cover the repaired portion, and temporarily fixed by some means. Or positioning the cradle. For example, the guide square member 62 supported by the jack 61 is supported by lifting from below (see FIG. 17). After that, when air is supplied to the holding air balloon 53 to expand it, the restriction surface 52 is pushed and strongly pressed against the surface S1 to be repaired. Therefore, displacement of the entire mold 51 is prevented. During this operation, the air hose 56a on the side of the peeling air balloon 55 is left in a blocked state, so that the peeling air balloon 55 remains deflated.

<Cross-section repair process>
After the mold 51 is set as described above, the restoration material 59 is supplied from the injection hose 58 to the restoration site, but the supplied restoration material 59 is prevented from leaking to the surroundings by the seal frame 57. At this time, the air pressure associated with the filling of the restoration material 59 is applied to the restricting surface 52. However, as described above, the restricting surface 52 is restrained by the holding air balloon 53 from behind and is not displaced. Since air escapes from the hole 60 and the sponge seal frame 57 acts to suck and discharge, the repair portion does not include bubbles, and a repair surface having a regulated surface is created ( (See FIGS. 18 and 19).

<Form removal process>
After the restoration material 52 is solidified, the mold 51 is removed. However, since the restoration material 59 is adhered and solidified to the regulation surface 52, the mold 51 is not easily peeled off from the restoration surface. However, in the case of the mold 51 according to the present invention, the peeling air balloon 55 is provided on the regulation surface 52 and / or the horizontal plane 54, so that the mold 51 can be expanded by supplying air thereto. It can be peeled off from the repair surface very easily.

<Repair surface post-treatment process>
After the repair work is completed, post-processing is performed on the repair surface as necessary. For example, after roughening the repaired surface (see FIG. 20), the concrete surface protective layer 65 is applied by applying or painting an impregnating material or a surface covering material (see FIG. 21).

  Although the invention has been described in some detail in its most preferred embodiments, it will be appreciated that a wide variety of embodiments can be constructed without departing from the spirit and scope of the invention. Accordingly, the invention is not limited to that particular embodiment, except as limited in the appended claims.

DESCRIPTION OF SYMBOLS 1 Investigation unit 2 Camera unit 7 Sound collection unit 21 Guide rail 22, 23 Jack 24 Utility head 31, 31a Wire conveyance means 32 Wire 41 RC radar 45 Laser distance meter 46 Mirror unit 51 Form frame 52 Restriction surface 53 Air balloon for holding 55 Air Balloon for Separation 57 Seal Frame 80 Bridge Girder Edge 81 Abutment 82 Narrow Spacing 83 Telescopic Device

Claims (11)

It is a method for investigating the end of a concrete structure having a narrow gap around it using the narrow gap and performing the necessary repairs based on the survey results,
-A survey unit setting step for arranging a unit support / moving means for moving in the narrow gap while supporting the survey unit in the narrow gap;
A survey / data acquisition step of moving the survey unit in the horizontal direction and the vertical direction along the survey target part, and acquiring data on the surface and / or internal properties;
-Analyzing the acquired data on the spot or in a place away from the site artificially or using an analysis device, judging whether or not repair is necessary based on the analysis result, and determining the repair target part and repair contents. A diagnostic process to identify;
-A repair process for repairing the specified content for the repair target part specified in the diagnosis process;
An investigation and repair method for concrete structures facing a narrow gap characterized by comprising   The survey and data acquisition step includes an appearance survey by a camera unit, a salt content survey by collecting a sample, a hammering survey by a hammering sound collection unit, and a natural potential survey by a natural potential measuring device. Item 1. Survey and repair method for concrete structures facing narrow gaps.   The repair process includes a concrete hanger process, a hanger depth measurement process, a rust preventive agent application process, a form setting process, a cross section repair process, a mold removal process, and a repair surface post-treatment process. The investigation and repair method for concrete structures facing the narrow play as described in 1 or 2.   The method for investigating and repairing a concrete structure facing a narrow gap according to any one of claims 1 to 3, further comprising a filler removing step before the survey and data collecting step.   The method for investigating and repairing a concrete structure facing a narrow gap according to claim 2, wherein the RC is used to confirm the position of a reinforcing bar prior to the collection of the sample when the content of the salt is collected.   4. The concrete facing the narrow gap according to claim 3, wherein the hanging depth is measured by using a laser distance meter and refracting the laser beam toward the suspended portion by a deflection mirror disposed in the narrow gap. Construction survey and repair method.   4. The narrow gap according to claim 3, wherein the mold frame is provided with a holding air balloon on the back side of the regulation surface that presses a regulation surface facing the repair target surface from behind to hold the entire mold frame in a normal position. Survey and repair method for concrete structures facing the sea.   The method for investigating and repairing a concrete structure facing a narrow gap according to claim 7, wherein the mold frame is provided with a peeling air balloon into which air is introduced when the mold frame is removed on the regulation surface.   The method for investigating and repairing a concrete structure facing a narrow gap according to claim 7 or 8, wherein the mold frame is provided with a seal frame capable of enclosing a repaired portion on a restriction surface thereof.   The unit supporting / moving means includes a pair of wire conveying means provided outside the narrow gap with the investigation target portion in the narrow gap interposed therebetween, and the investigation unit is fixed midway between the wire conveying means. A horizontal movement mechanism comprising a wire to be passed, a pair of racks vertically arranged outside the narrow gap across the investigation target portion in the narrow gap, and the racks respectively disposed on the wire conveying means The method for investigating and repairing a concrete structure facing a narrow gap according to claim 1, wherein the wire moving system is a combination of a lifting mechanism composed of a pinion meshing with the pinion and a rotation driving means of the pinion.   The method for investigating and repairing a concrete structure facing a narrow gap according to claim 10, wherein a position information display device for detecting the position of the investigation unit is installed on the pair of wire conveying means.

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