JP2013100700A - Repair method for joint gap inner face at end of concrete floor slab - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a repair method for enabling adequate repair of a joint gap inner face formed at the end of a concrete floor slab of a bridge while involving grinding work, although conventionally considered to be difficult.SOLUTION: A high pressure water injection nozzle 22 is inserted through an upper part opening 6a of a joint gap 6 formed at the end of the concrete floor slab of the bridge for grinding a concrete surface layer part of a joint gap inner face 8 with the high pressure water injection of the high pressure water injection nozzle to form a vertical ground space 9. A lower end 8a of the joint gap inner face is left without being ground during grinding work to form a projection 10 which restricts the vertical ground space. A concrete form is erected with reference to the end face of the projection, and a repair material is filled into the vertical ground space defined by the concrete form and the projection.

Description

  The present invention relates to a method for repairing the inner surface of a play extending in the width direction of a bridge formed at the end of a concrete floor slab in a bridge such as a river bridge, an overpass or a viaduct.

  The inner surface of the play gap formed at the end of the concrete floor slab in the bridge is easy to get wet due to rainwater leakage and poor ventilation, and the local deterioration tends to proceed, so local repair work in the local area Is required.

  However, since the gap is very narrow, it is difficult to repair the inner surface of the gap with a concrete shaving work. Conventionally, a water stop work in which the upper opening of the gap is closed with a water stop material or the like has been the mainstream. It has been difficult to effectively prevent water leakage to the inner surface of the play and concrete deterioration even by such a water stop construction.

  Therefore, it is desired to provide repair means for appropriately performing the above-described work of cutting the concrete surface layer on the inner surface of the play and the work of filling the repaired material into the portion cut by the work.

  As described above, leaving the deterioration of the inner surface of the idle floor formed at the end portion of the concrete slab, that is, the end surface of the concrete slab or the rising surface of the abutment, the deterioration of the concrete surface layer portion of the end surface of the concrete slab or the rising surface of the abutment In addition to this, corrosion of the reinforcing steel bars embedded in the concrete floor slab or in the abutment may be induced, leading to a decrease in strength of the entire bridge.

  The present invention provides a repair method capable of appropriately performing repair accompanied by a shaving operation of the inner surface of the play formed on the end portion of the concrete floor slab, which has been conventionally difficult.

  Briefly, a high-pressure water injection nozzle is inserted from the upper opening of the gap formed at the end of the concrete floor slab in the bridge, and the concrete surface layer portion of the inner surface of the gap is scraped vertically by high-pressure water injection by the high-pressure water injection nozzle. A direction-cutting space is formed, and an overhang is formed without cutting the lower end of the inner surface of the idle space during the cutting operation so as to limit the vertical direction cutting space, and a mold is erected with the end face of the overhang as a reference. A repair method for filling a repair material into the vertical direction cutting space defined by the formwork and the overhang, and repairing material into the vertical direction cutting space by the overhang while appropriately shaving the inner surface of the gap. Surely perform the filling.

  Preferably, the repair material to be filled in the longitudinal direction cutting space is a polymer cement mortar containing reinforcing fibers to realize a repair structure with high toughness and high strength.

  More preferably, the lower surface of the end portion of the concrete floor slab is repaired with a polymer cement mortar containing reinforcing fibers, and the high-toughness and high-strength overhang is formed with the polymer cement mortar containing reinforcing fibers. The above-mentioned polymer cement mortar with reinforcing fibers is a material that significantly improves the toughness during bending, tension, and compression failure by repeating fine cracks in the surface layer itself, contributing to higher toughness and strength of the filling area. To do.

  As a suitable example, the mold is formed of a see-through material, and the filling of the repair material into the vertical direction cutting space is confirmed through the mold to ensure reliable filling.

  In addition, the tube is expanded in the gap so that the form frame is pressed against the end face of the overhang to hold the standing posture, thereby realizing the quick and accurate standing of the form frame.

  The present invention appropriately repairs the inner surface of the free end of the concrete floor slab, which has been difficult to repair with shaving, and enables repair work to maintain the bridge soundly.

A is a perspective view schematically showing a part of an expansion joint arranged at the upper opening between the ends of the concrete floor slab supported by the abutment, and B is a clearance between the ends of the concrete floor slab supported by the pier. The perspective view which outlines the expansion joint arrange | positioned in upper opening partly notched. A is sectional drawing which shows the removal process of the expansion joint in the gap of the concrete floor slab end part supported by the abutment, B is sectional drawing which shows the removal process of the expansion joint in the gap of the concrete floor slab end part supported by the pier. A is sectional drawing which shows the cutting process in the play inner surface of the concrete floor slab end part supported by the abutment, B is sectional drawing which shows the cutting process in the play inner surface of the concrete floor slab end supported by the pier. A is a cross-sectional view showing the filling process of the repair material into the longitudinal cutting space cut on the inner surface of the free end of the concrete floor slab supported by the abutment, and B is the free space of the end of the concrete floor slab supported by the pier. Sectional drawing which shows the filling process of the repair material in the vertical direction cutting space machined in the inner surface. A is a sectional view showing the installation process of a new expansion joint in the gap between the ends of the concrete slab supported by the abutment, and B is the installation process of a new expansion joint in the gap between the ends of the concrete slab supported by the pier. FIG. The perspective view of the shaving apparatus used at the shaving process of the repair construction method concerning this invention. The front view of the installation stand of the said cutting device. The side view of the mounting base of the said shaving apparatus. The top view of the bridge width direction frame of the said installation stand. The vertical sectional view of the above-mentioned bridge width direction frame. The horizontal sectional view of the up-and-down direction frame of the above-mentioned installation stand. Explanatory drawing which partially cuts out and outlines the pipe support body, high-pressure water supply pipe, and high-pressure water injection nozzle of the said shaving apparatus. The expanded sectional view of the said high pressure water injection nozzle. The expanded sectional view which shows the other example of the said high pressure water injection nozzle. Explanatory drawing of the rocking | fluctuation of the fan-shaped locus | trajectory of the said high pressure water injection nozzle. A is a principal part expanded sectional view of the cover of the scattering prevention apparatus provided in the shaving apparatus, B is a principal part enlarged plan view, C is a principal part enlarged sectional view showing another example of the lid of the scattering prevention apparatus, D Is an enlarged plan view of the main part, E is an enlarged sectional view of the main part showing still another example of the lid of the scattering prevention device, and F is an enlarged plan view of the main part.

  DESCRIPTION OF THE PREFERRED EMBODIMENTS The best mode of a method for repairing an inner surface of a loose floor of a concrete floor slab according to the present invention will be described with reference to FIGS.

  In the bridge supported by the floor slab support seating surface 4 of the abutment 2 in which the ends of the concrete slab 1 are arranged at both ends of the span span of the bridge, as shown in FIG. The expansion joint 3 is disposed in the upper opening 6a of the play 6 extending in the bridge width direction and penetrating in the vertical direction, which is formed between the end face 1a of the abutment 2 and the rising face 5 at the inner end of the floor slab support seat surface 4 of the abutment 2. Yes.

  Similarly, in the bridge in which the concrete floor slab 1 is supported by the floor slab support seat surface 4 of the bridge pier 2 'arranged in the middle of the span length of the bridge, as shown in FIG. The expansion joint 3 is disposed in the upper opening 6a of the play 6 extending in the bridge width direction and penetrating in the vertical direction formed between the end surface 1a of the section and the end surface 1'a of the adjacent concrete floor slab 1 'end. In the figure, reference numeral 3a denotes a water-stopping material made of foamed polystyrene or the like inserted in the upper opening 6a of the gap 6 immediately below the expansion joint 3.

  In addition, in the present application, the concrete floor slab 1 is a concrete floor slab formed by in-situ concrete, a PC concrete floor slab formed at a factory, or a steel girder (such as an H-shaped steel girder) and a cast concrete floor slab. Or all the concrete slabs in the composite bridge etc. which were formed with PC concrete slabs are included. In the present application, the concrete floor slab 1 includes a floor slab in which a road surface is paved with a paving material such as asphalt.

  The repair method includes repair of the inner surface 8 of the gap 6 when the expansion joint 3 is not disposed in the upper opening 6a of the gap 6.

  Hereinafter, specific examples of the present invention will be described step by step.

<See FIGS. 1A and 2A>
When the end portion of the concrete slab is supported by the abutment 2, the end surface 1a of the end portion of the concrete floor slab supported by the floor slab support seating surface 4 of the abutment 2 and the end surface 1a facing the same The expansion joint 3 disposed in the upper opening 6a of the gap 6 formed between the rising surfaces 5 at the inner end of the floor slab support seat surface 4 is removed together with the surrounding mounting portion concrete 16 to expand the upper opening 6a. A recessed space 7 is formed.

<See FIGS. 1B and 2B>
When the concrete floor slab 1 is supported by the pier 2 ', the end surface 1a of the end portion of the concrete floor slab 1 supported by the floor slab support seating surface 4 of the pier 2' and the end face 1a facing the same. The expansion joint 3 arranged in the upper opening 6a of the free space 6 formed between the end faces 1'a of the adjacent concrete floor slab 1 'end supported by the floor slab support seat surface 4 together with the surrounding mounting part concrete 16 A recessed space 7 is formed to remove and extend the upper opening 6a.

  The rising portion of the reinforcing reinforcing bar (vertical reinforcing bar) 15 embedded in the concrete floor slab 1 or the abutment 2 exposed in the recessed space 7 formed as described above is excised while leaving a certain length, and the placement described later after the repair. Embedded in the concrete 13.

<See FIG. 3A>
Next, when the end portion of the concrete slab 1 is supported by the abutment 2, the high pressure water jet nozzle 22 of the shaving device 21, which will be described later, is made vertical (on the upper surface 1 b of the concrete slab) from the upper opening 6 a of the gap 6. The inner surface 8 of the play 6, that is, the concrete floor slab end face 1 a and / or the rising surface 5 of the abutment 2 (concrete). The concrete surface layer portion of the floor slab end face 1a) is cut away to cut the vertical cutting space 9, and the lower end 8a of the inner surface 8 of the gap 6 remains without being cut during the cutting operation. An overhang 10 for limiting the cutting space 9 is formed.

  In other words, the high-pressure water supply pipe 23 and the high-pressure water injection nozzle 22 at the lower end of the pipe 23 are moved in the bridge width direction while maintaining the posture in which the high-pressure water supply pipe 23 described later is inserted vertically into the gap 6. Then, the shaving operation of the inner surface 8 of the gap 6 is performed. Therefore, the vertical direction cutting space 9 is cut over both ends of the gap 6 in the bridge width direction, and the lower end of the vertical direction cutting space 9 is limited by the overhang 10 and is formed on the end face 10a of the overhang 10. Opened by the lower opening 6b. The overhang 10 is formed over both ends of the gap 6 in the bridge width direction.

<See FIG. 3B>
Similarly, when the end portion of the concrete slab 1 is supported by the bridge pier 2 ′, a high-pressure water injection nozzle 22 of a shaving device 21, which will be described later, is inserted vertically from the upper opening 6 a of the gap 6, and the high-pressure water The internal space 8 of the gap 6, that is, the concrete surface layer end portion of the concrete floor slab end surface 1 ′ a and / or the adjacent concrete floor slab end surface 1 ′ is cut by the high pressure water injection by the injection nozzle 22 to cut the vertical direction cutting space 9. Then, an overhang 10 is formed that remains without cutting the lower end 8a of the inner surface 8 of the gap 6 during the cutting operation and restricts the vertical cutting space 9.

  In other words, the high-pressure water supply pipe 23 and the high-pressure water injection nozzle 22 at the lower end of the pipe 23 are moved in the bridge width direction while maintaining the posture in which the high-pressure water supply pipe 23 described later is inserted vertically into the gap 6. Then, the shaving operation of the inner surface 8 of the gap 6 is performed. Therefore, the vertical direction cutting space 9 is cut over both ends of the gap 6 in the bridge width direction, and the lower end of the vertical direction cutting space 9 is limited by the overhang 10 and is formed on the end face 10a of the overhang 10. Opened by the lower opening 6b. The overhang 10 is formed over both ends of the gap 6 in the bridge width direction.

  Preferably, as shown in FIG. 3B, the bottom surface 1c of the end portion of the concrete floor slab 1 and / or the bottom surface 1'c of the end portion of the adjacent concrete floor slab 1 'is reinforced with polymer cement mortar 12 before the shaving operation. By repairing with ′, the overhang 10 is formed with the polymer fiber mortar 12 ′ with reinforcing fibers, and the overhang 10 is made tough and high in strength, so that the mold 11 described later can be erected reliably. It is possible to appropriately hold the repair material 12 filled in the vertical direction cutting space 9.

  The high-pressure water injection nozzle 22 reciprocates in the vertical direction (vertical direction) and the bridge width direction (horizontal direction) within the gap 6 while swinging in a fan-shaped locus around the axial direction of the high-pressure water supply pipe 23. The concrete surface layer portion of the inner surface 8 of the gap 6 is cut without unevenness, and the vertical direction cutting space 9 is cut.

<See FIGS. 4A and 4B>
Next, a mold frame 11 is erected on the basis of the end face 10 a of the overhang 10, and a cement mortar 12 as a repair material is filled in the vertical direction cutting space 9 defined by the mold frame 11 and the overhang 10. . That is, it is possible to effectively prevent leakage of the cement mortar 12 to be filled by the cooperation of the mold 11 and the overhang 10 and perform an appropriate filling operation.

  The cement mortar 12 is a mixture of cement, mortar and water, and a polymer cement mortar to which a polymer resin is added, or a concrete to which an aggregate such as sand or gravel is added, or a resin or metal Includes cement mortar containing reinforcing fibers mixed with organic reinforcing fibers or polymer cement mortar containing reinforcing fibers. In the present application, cement mortar is a general term for these.

  Preferably, the longitudinal cutting space 9 is filled with polymer cement mortar 12 'containing reinforcing fibers to give a repair structure with high toughness and high strength.

  In the above-mentioned polymer cement mortar 12 ′ containing reinforcing fibers, vinylon fibers, polyethylene fibers, or mixed fibers of vinylon fibers and polyethylene fibers are mixed as reinforcing fibers, so-called high toughness cement composite materials (DFRCC) and Ductile Fiber Reinforced Cementitious Composites To do.

  The above-mentioned high-toughness cement composite material, which is a polymer cement mortar 12 'containing reinforcing fibers, is a material that significantly improves the toughness during bending, tension and compression failure by repeating microcracking in the surface layer part against the external force after curing. It contributes to higher toughness and strength of repaired parts.

  As a suitable example of standing the mold 11, a tube 14 extending in the bridge width direction is attached to the outer surface side of the mold 11, and the tube 14 is expanded in the gap 6 to form the mold 11. It is set as the structure which presses against the end surface 10a of the overhang | projection 10, and hold | maintains a standing posture. Preferably, the tube 14 is attached to the outer surface of the part of the mold 11 that faces the end surface 10a of the overhang 10.

  Further, as a suitable example, the mold 11 is formed of a see-through material, and filling of the repair material such as cement mortar 12 and polymer cement mortar 12 'with reinforcing fibers into the longitudinal direction cutting space 9 through the mold 11 is performed. Make sure to perform the filling work.

<See FIGS. 5A and 5B>
Next, after the repair material such as the cement mortar 12 filled in the vertical direction cutting space 9 and the polymer cement mortar 12 'with reinforcing fibers is hardened, the concrete 13 is placed in the concave space 7 and a new expansion joint 3 is placed. Buried.

  At this time, a hole is drilled in the bottom surface of the recessed space 7 to erect an insertion bar 17, the new expansion joint 3 is connected to the insertion line 17, and the insertion line 17 and the new expansion joint 3 are connected. Is buried in the cast concrete 13 to complete the repair work.

  In the above embodiment, an overhang 10 that remains without cutting the lower end 8a of the inner surface 8 of the gap 6 during the shaving operation and restricts the longitudinal shaving space 9 is formed, and the formwork is based on the end face 10a of the overhang 10. 11 is a repairing method in which the repair material 12 is filled in the longitudinal cutting space 9 defined by the mold 11 and the overhang 10, but the overhang that limits the longitudinal cutting space 9. The inner surface 8 is shaved from the upper opening 6a to the lower opening 6b of the gap 6 without forming the gap 10, and a mold is erected on the side surface and the lower surface of the vertical shaving space 9, and is defined by the mold. This is based on the premise of a repair method in which the repair material 12 is filled in the vertical direction cutting space 9.

  Next, a shaving device 21 for shaving the inner surface 8 of the gap 6 used in the shaving process of the repair method according to the present invention will be described with reference to FIGS.

  As shown in FIG. 6, the shaving device 21 is provided with a high-pressure water supply pipe 23 having a high-pressure water injection nozzle 22 at the lower end, and the high-pressure water supply pipe 23 is moved up and down to move the high-pressure water injection nozzle 22. The high-pressure water supply pipe 23 is reciprocated in the bridge width direction so that the high-pressure water injection nozzle 22 can reciprocate along the gap 6. The upper surface 1b of the concrete floor slab 1 (the upper surface 1'b of the adjacent concrete floor slab 1 'or the upper surface 2a of the abutment 2) is supported by the mounting base 24 that supports the vertical movement and the reciprocating motion in the bridge width direction while suspending 23. The high-pressure water jet nozzle 22 is inserted into the gap 6 from above the concrete floor slab 1 and moved in the bridge width direction to cut the inner surface of the gap 6.

  As shown in FIGS. 7 and 8, the mounting base 24 supports the high-pressure water supply pipe 23 vertically while supporting it so as to be movable in the bridge width direction (X direction in the figure), that is, in the horizontal direction. 24A extending in the vertical direction and the vertical direction extending in the vertical direction (Y direction in the figure), ie, supporting the bridge width direction structural body 24A movably in the vertical direction via the frame support 24C. The frame 24B is installed to withstand the reaction of the high pressure water injection by the high pressure water injection nozzle 22 at the lower end of the high pressure water supply pipe 23 and the weight of the bridge width direction frame 24A.

  The mounting base 24 supports the high-pressure water supply pipe 23 vertically while supporting the high-pressure water supply pipe 23 so as to be movable in the bridge width direction (X direction in the figure) and the vertical direction (Y direction in the figure). If possible, the present invention is not limited to the above configuration. For example, the high-pressure water supply pipe 23 is vertically supported on the vertical frame 24B while being supported so as to be movable in the vertical direction, and the vertical frame 24B is supported on the bridge-width frame 24A so as to be movable in the bridge width direction. Do not exclude doing.

  As shown in FIGS. 9 and 10, the bridge-width-direction frame body 24 </ b> A is vertically attached to a pipe support 25 that vertically supports the high-pressure water supply pipe 23 and a plurality of upper rollers 26 that the pipe support 25 includes. A pair of upper bridge width direction guide rails 27 which are held from the side and guide the upper roller 26 in the bridge width direction, and a plurality of lower rollers 28 provided in the pipe support 25 are supported from the front and rear sides to bridge the lower roller 28. And a lower bridge width direction guide rail 29 for guiding in the width direction.

  The pipe support is provided with a bridge width direction moving rack 32 that rotates and rotates the bridge width direction pinion gear 31 with the hydraulic motor 30 as a power source and meshes with the pinion gear 31. 25 is reciprocated in the bridge width direction, and the high-pressure water supply pipe 23 is reciprocated in the bridge width direction (X direction in the figure) while maintaining a vertical posture.

  As shown in FIG. 11, the vertical frame 24B is supported by a plurality of rear rollers 33 of the frame support 24C from the front and rear sides and from the left and right sides to guide the rear rollers 33 in the vertical direction. The guide rail 34 is provided, and the vertical movement pinion gear 36 is rotated by using the vertical movement hydraulic motor 35 provided in the frame support 24C as a power source, and the vertical movement rack 37 is engaged with the pinion gear 36. The bridge width direction frame body 24A is reciprocated in the vertical direction, so that the high-pressure water supply pipe 23 is reciprocated in the vertical direction (Y direction in the figure) while maintaining the vertical posture.

  The bridge width direction moving mechanism of the bridge width direction frame 24A and the vertical direction moving mechanism of the vertical frame 24B do not exclude application of a known moving mechanism.

  As shown in FIG. 12, the pipe support 25 includes a swivel joint 38 connected to a high-pressure water hose that supplies water to the high-pressure water supply pipe 23, and a swing hydraulic motor 39. The high-pressure water supply pipe 23 is swayed in a fan shape (oscillating in the Z direction in the figure) through the link mechanism 40 known as a source, and the high-pressure water jet at the lower end together with the high-pressure water supply pipe 23. The nozzle 22 is swung.

  The fan-shaped rocking angle of the high-pressure water supply pipe 23 and the high-pressure water injection nozzle 22 is preferably 90 degrees, and the rocking effectively performs the cutting work in a narrow space, thereby cutting the vertical cutting space 9 free from cutting unevenness. Can be made.

  The above-described mounting table 24 is directly installed on the upper surface 1b of the concrete floor slab 1. Or you may install directly on the upper surface 1'b of the adjacent concrete floor slab 1 ', or on the upper surface 2a of the abutment 2.

  Alternatively, the above-described installation base 24 is installed on a vehicle 50 that can run on its own and moves on the upper surface 1b of the concrete floor slab 1 (or the upper surface 1'b of the adjacent concrete floor slab 1 'or the upper surface 2a of the abutment 2), The installation location can be changed freely. In this case, an engine or a hydraulic motor known as a self-propelled power source can be used as the power source.

  In particular, if the self-propelled power source is a hydraulic motor, the power source can be shared with the bridge width direction moving hydraulic motor 30, the vertical direction moving hydraulic motor 35, and the swinging hydraulic motor 39, and no exhaust gas is emitted. It can be set as an apparatus with little load.

  Preferably, the self-propelled hydraulic motor, the bridge-direction moving hydraulic motor 30, the up-and-down moving hydraulic motor 35, and the swinging hydraulic motor 39 are controlled unmanned by wired or wireless via a known remote controller. Enable operation.

  Note that reference numeral 41 in FIG. 6 denotes a counterweight that is supported behind the self-propelled vehicle 50 and prevents the installation base 24 from toppling over. The counterweight 41 is supported at a distance from the upper surface 1b of the concrete slab 1 so as to maintain the balance of the mounting table 24 and to reduce shaking due to the reaction of the high pressure water injection from the high pressure water injection nozzle 22. .

  As shown in FIG. 12, the high-pressure water supply pipe 23 has a double pipe structure including an outer pipe 23A and an inner pipe 23B, and the inner pipe 23B is supported at a plurality of locations by bearings 42 such as ball bearings and needle bearings. It is firmly supported while being allowed to swing about the axial direction (swing in the Z direction in the figure).

  The outer diameter of the outer pipe 23A is set slightly smaller than the width in the bridge length direction of the gap 6 so that the outer pipe 23A can move within the gap 6. For example, when the width of the gap 6 in the bridge length direction is 70 mm, it is set to about 50 mm.

  The high-pressure water injection nozzle 22 is provided at the lower end of the high-pressure water supply pipe 23, specifically, the lower end of the inner pipe 23B. As shown in FIG. 13, a nozzle unit 22b having an injection port 22a and the nozzle unit 22b are connected to each other. A metal cylindrical nozzle unit protection part 22c to be protected is provided, the nozzle unit 22b is screwed into a screw hole 22d cut in the nozzle unit protection part 22c, and high pressure water is injected through the injection port 22a. While swinging together with the inner pipe 23B of the high-pressure water supply pipe 23.

  The outer diameter of the nozzle unit protection part 22c is set slightly smaller than the width of the gap 6 in the bridge length direction like the outer pipe 23A of the high-pressure water supply pipe 23, and the high-pressure water jet in the gap 6 is set. The nozzle 22 can be moved. Furthermore, the tip surface of the nozzle unit 22b is provided so as not to protrude from the nozzle unit protection part 22c, and the high-pressure water spray nozzle 22 can be reliably moved within the gap 6.

  The high pressure water injection nozzle 22 can change the opening angle of the injection port 22a of the nozzle unit 22b by changing the cutting angle of the screw hole 22d, and the injection angle of the high pressure water from the injection port 22a. Can be varied.

  When necessary, the high-pressure water spray nozzle 22 protrudes from the lower end of the gap 6, that is, the lower opening 6 b of the gap 6, by the downward movement of the vertical frame 24 </ b> B, and the concrete slab end face 1 a and the lower face 1 c You can cut out the corner where the crosses.

  In addition, when the jet port 22a of the high pressure water jet nozzle 22 is arranged to open downward in the gap 6 and a protrusion is formed in the gap 6, the protrusion 6 is shaved to remove the gap 6 The width in the bridge length direction can be expanded to a width in which the high-pressure water injection nozzle 22 can be inserted. Similarly, when the injection port 22a is arranged so as to open downward in the gap 6, the water stop material made of foamed polystyrene or the like already installed in the gap 6 can be removed.

  Further, as shown in FIG. 14, the lower surface of the high-pressure water supply pipe 23 has an injection port 22 a for injecting high-pressure water that cuts one inner surface 8 that forms the play 6 and the other inner face 8 that forms the play 6. The high-pressure water injection nozzle 22 having the injection port 22a for injecting the high-pressure water that cuts the surface can be provided.

  In other words, the high pressure water supply pipe 23 is provided with a high pressure water injection nozzle 22 having a pair of nozzle units 22b whose injection directions by the injection ports 22a are opposite to each other at the lower end, and both inner surfaces 8 forming the clearance 6 are simultaneously scraped. be able to.

  Further, as shown in FIGS. 6 and 16, the shaving device 21 is made of the upper surface 1 b of the concrete floor slab 1 of the concrete piece shaved by the high-pressure water jet nozzle 22 (or the upper surface 1 ′ of the adjacent concrete floor slab 1 ′). b or a device 43 for preventing scattering to the upper surface 2 a) of the abutment 2 is installed along the upper opening 6 a of the gap 6. If it is impossible to close the entire road during repair work, such as a bridge on an expressway, if a concrete piece hits a vehicle passing by the side of the shaving device 21, it may lead to a serious accident. The scattering to the upper surface 1b of the concrete floor slab 1 is surely prevented.

  The scattering prevention device 43 is an iron plate laid from the upper surface 1b of the concrete floor slab 1 to the upper surface 2a of the abutment 2 or from the upper surface 1b of the concrete floor slab 1 to the upper surface 1'b of the adjacent concrete floor slab 1 '. And a first slit 45 through which the high-pressure water injection nozzle 22 and the high-pressure water supply pipe 23 are inserted. The first slit 45 is provided with the high-pressure water injection nozzle 22 and the high-pressure water supply pipe 23. While the water jet nozzle 22 and the high-pressure water supply pipe 23 are inserted, the concrete piece cut by the high-pressure water jet nozzle 22 is prevented from being scattered on the upper surface 1b of the concrete floor slab 1 by the back surface.

  Further, as shown in FIG. 16A and FIG. 16B, a lid body 46 having a U-shaped section or a U-shaped section that is installed across the first slit 45 of the installation plate 44 is provided. A second slit 47 that opens from the slit 45 through a required height and passes through the high-pressure water injection nozzle 22 and the high-pressure water supply pipe 23 is formed. The scattering of the concrete pieces that have jumped out from the first slit 45 of the installation plate 44 on the inner wall surface and the inner top surface of the lid 46 is prevented.

  Preferably, as shown in FIGS. 16C and 16D, a brush 48 is provided along an edge 47a extending in the bridge width direction of the second slit 47 of the lid 46, or as shown in FIGS. 16E and 16F. A flexible piece 49 made of a rubber piece or the like is provided along the edge portion 47a extending in the bridge width direction of the second slit 47 of the lid body 46 to prevent the concrete piece from scattering more reliably.

  As described above, the repair method according to the present invention can appropriately repair the inner surface of the play formed at the end of the concrete floor slab in the bridge, which has been considered difficult in the past, thereby contributing to the sound maintenance of the bridge. be able to.

  Further, the shaving device 21 swings the high-pressure water injection nozzle 22 around the axial direction of the high-pressure water supply pipe 23 (swings in the Z direction in the figure) and the vertical direction (X direction in the figure) and the bridge width direction ( It is possible to move freely in the Y direction in the figure, and the inner surface 8 of the gap 6 can be cut evenly, and by providing the anti-scattering device 43 in the cutting device 21, the safety of workers and bridge users can be improved. Appropriate repair work can be performed while ensuring.

  DESCRIPTION OF SYMBOLS 1 ... Concrete floor slab, 1a ... Concrete floor slab edge end surface, 1b ... Concrete floor slab edge upper surface, 1c ... Concrete floor slab edge lower surface, 1 '... Adjacent concrete floor slab, 1'a ... Adjacent concrete floor slab edge Part end surface, 1'b ... Adjacent concrete floor slab end top surface, 1'c ... Adjacent concrete floor slab end bottom surface, 2 ... Abutment, 2 '... Bridge pier, 3 ... Expansion joint, 4 ... Floor slab support seat surface, 5 ... Rising surface, 6 ... Gap, 6a ... Upper opening, 6b ... Lower opening, 7 ... Recessed space, 8 ... Gap inner surface, 8a ... Lower edge of gage inner surface, 9 ... Vertical shaving space, 10 ... Overhang, 10a ... Overhang end surface 11 ... Formwork, 12 ... Cement mortar (repair material), 12 '... Reinforced fiber-reinforced polymer cement mortar (repair material), 13 ... Casting concrete, 14 ... Tube, 15 ... Reinforcement reinforcement, 16 ... Mounting part concrete, 17 Insertion line, 21 ... shaving device, 22 ... high pressure water injection nozzle, 22a ... injection port, 22b ... nozzle unit, 22c ... nozzle unit protection section, 22d ... screw hole, 23 ... high pressure water supply pipe, 23A ... outer pipe, 23B ... inner pipe, 24 ... mounting base, 24A ... bridge width direction frame, 24B ... vertical frame, 24C ... frame body support, 25 ... pipe support, 26 ... upper roller, 27 ... upper bridge width direction guide rail 28 ... Lower roller, 29 ... Lower bridge width direction guide rail, 30 ... Bridge width direction movement hydraulic motor, 31 ... Bridge width direction movement pinion gear, 32 ... Bridge width direction movement rack, 33 ... Rear roller, 34 ... Up and down direction guide rail, 35 ... Up and down direction hydraulic motor, 36 ... Up and down direction pinion gear, 37 ... Up and down direction movement rack, 38 ... Swivel joint, DESCRIPTION OF SYMBOLS 9 ... Hydraulic motor for oscillation, 40 ... Link mechanism, 41 ... Counterweight, 42 ... Bearing, 43 ... Anti-scattering device, 44 ... Installation plate, 45 ... First slit, 46 ... Lid, 47 ... Second slit, 47a ... an edge extending in the bridge width direction, 48 ... a brush, 49 ... a flexible piece, 50 ... a self-propelled vehicle.

Claims (5)

  A high-pressure water injection nozzle is inserted from the upper opening between the gaps formed at the end of the concrete floor slab in the bridge, and the vertical surface cutting space is created by cutting the concrete surface layer on the inner surface of the gap by high-pressure water injection by the high-pressure water injection nozzle. Forming a bulge that remains without cutting the lower end of the inner surface of the gap during the cutting operation and restricts the vertical cutting space, and stands the mold frame on the basis of the end surface of the bulge, A repair method for the inner surface of the loose floor of the concrete floor slab characterized in that a repair material is filled in the vertical direction cutting space defined by the overhang and the overhang.   2. The method of repairing a loose inner surface of an end portion of a concrete floor slab according to claim 1, wherein the repair material to be filled into the longitudinal direction cutting space is a polymer cement mortar containing reinforcing fibers.   The lower surface of the end part of the concrete floor slab is repaired with a polymer cement mortar containing reinforcing fibers, and the overhang is formed with the polymer cement mortar containing reinforcing fibers. Repair method for the inner surface of the gap between the ends of the concrete floor slab.   The said formwork is formed with a fluoroscopy material, It was set as the structure which confirms filling of the repair material in the said vertical direction cutting space through this formwork. Repair method for the inner surface of the loose floor of the concrete floor slab.   The concrete floor slab according to any one of claims 1 to 4, wherein a tube is expanded in the gap to press the formwork against an end face of the overhang to maintain a standing posture. Repair method for the inner surface of the gap between the ends.

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