JP2012077546A - Expansion joint removing method and road cutting method - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an expansion joint removing method that suppresses water leakage from an expansion spacing section and that enables an expansion joint to be removed in a short amount of time without cutting of a reinforcement, and a road cutting method.SOLUTION: The formation of a weir 7b can inhibit water, which is jetted from a collision nozzle 41, from flowing into an expansion spacing section 2, restrain a noise, which is generated by water injection, from being propagated to the expansion spacing section 2, prevent the water from falling onto a store installed below a bridge 52, a parked vehicle and the like, and restrain a noise problem from being caused by the reverberation of the noise in the expansion spacing section 2.

Description

  TECHNICAL FIELD The present invention relates to a removal method and a road cutting method for removing an expansion joint for renewal when an expansion joint connecting a plurality of floor slabs constituting a bridge is aged.

  A plurality of floor slabs constituting the bridge are juxtaposed on the bridge girder along the front-rear direction, and a gap is provided between the opposing floor slabs to absorb the expansion and contraction of the floor slab due to temperature changes. Yes. In general, the idler portion is provided with an expansion joint reinforced by reinforcing bars in order to make the idler portion function as a road surface. The impact is repeatedly propagated to the expansion joint by the passage of the vehicle, and the aging progresses. Aged expansion joints generate large noises and vibrations, and the water tightness decreases. Therefore, it is necessary to remove the existing expansion joints in order to install new expansion joints.

  Patent Document 1 describes a method of removing an expansion joint using a wire saw device, and the removal method forms a groove using a cutter disk in concrete that fixes the periphery of the expansion joint, Since the cutting wire of the wire saw device runs in the groove, the expansion joint can be removed together with the reinforcing bar and the concrete.

JP 2006-183408 A

  However, in the method for removing the expansion joint described in Patent Document 1, in order to cut the reinforcing bar that reinforces the expansion joint, when installing a new expansion joint, a large number of anchors must be placed for reinforcement. Moreover, in order to prevent the water supplied in order to reduce the friction of a cutting wire from splashing downward from a loose part, it is necessary to prepare a large-scale drainage curing equipment beforehand. Another problem is that it takes a long time (approximately two days) to be removed.

  The present invention has been made in view of such circumstances, and has an expansion joint removal method and water leakage that can suppress the leakage from the gap and can remove the expansion joint in a short time without cutting the reinforcing bar. An object of the present invention is to provide a road cutting method that can suppress and cut a road in a short time without cutting a reinforcing bar.

  The expansion joint removing method according to the present invention includes a floor slab that connects expansion slabs that face each other along the width direction at a free space formed between a plurality of floor slabs arranged side by side on a bridge girder. In the method of removing the expansion joint, the fixed portion fixed to the surface is removed and the expansion joint is removed. The step of forming a water storage portion for storing water by spraying water from a nozzle to cut the fixed portion, and the water storage And a step of removing the expansion joint after the drainage from the water storage unit is completed.

  In the present invention, the fixed portion is cut to form a water storage portion, and the water stored in the water storage portion is discharged, thereby preventing the water sprayed from the nozzle from flowing into the idler portion, It suppresses that the sound which arises by injecting propagates to an idle part. The water pressure required to remove the fixed portion made of concrete is not large enough to cut the rebar, but only the fixed portion is removed. The time required for removal is short (approximately 2.5 to 3 hours).

  The expansion joint removing method according to the present invention is such that the water storage part is formed on the side of the idler part of the fixed part by cutting the opposite side of the idler part of the fixed part, and water is supplied to the idler part. A weir for preventing inflow is provided, and the method further comprises a step of removing the weir before removing the expansion joint.

  In the present invention, by forming a weir on the idler side of the fixed part, water sprayed from the nozzle is reliably prevented from flowing into the idler part.

  The expansion joint removing method according to the present invention is characterized in that the weir is positioned next to the idler portion in a state of protruding upward from the water storage portion.

  In this invention, the weir which protruded upwards rather than the water storage part is formed next to a play part, and the inflow prevention of the water from a water storage part to a play part is implement | achieved.

  The expansion joint removing method according to the present invention is characterized by further comprising a step of providing a water stop portion for preventing water leakage on the upper side of the gap portion or in the gap portion.

  In the present invention, even if water enters over the water storage section or the weir and enters the play section, the water stop section prevents water from splashing downward.

  In the method for removing an expansion joint according to the present invention, the nozzle includes a plurality of injection ports, and adjusts the direction of the nozzles so that water injected from each injection port collides with each other at a predetermined position. A depth at which the fixed portion is cut is set in advance.

  In the present invention, the depth that can be cut by the nozzle is up to the vicinity of the position where water jetted from each jetting port collides, so the depth at which the fixed part is cut by appropriately adjusting the position where the water collides. Set the thickness to prevent over-shaving.

  The method for removing an expansion joint according to the present invention further comprises a step of supporting the nozzle on a moving device that moves on a rail parallel to the floor slab and installing the moving device on the upper side of the expansion joint. And

  In the present invention, a moving device is installed on the upper side of the expansion joint, the drive of the moving device is controlled, a nozzle is arranged at a desired position near the expansion joint, and the fixed portion is cut accurately and in a short time. Can do. Moreover, a fixed part can be cut to the back side of a reinforcing bar.

  In the method of removing an expansion joint according to the present invention, the moving device includes a plurality of support portions on the moving shaft that support the nozzle, the support of the nozzle in one support portion is released, and the support portion supports the nozzle. The method further includes a step of supporting the nozzle.

  In this invention, the location of the fixed part which cannot be cut with the nozzle supported by one support part is cut with the nozzle supported by the other support part, and the whole fixed part is reliably removed.

  The expansion joint removal method according to the present invention further includes a step of providing a soundproof wall around the expansion joint.

  In the present invention, the noise generated during the removal of the expansion joint is absorbed or blocked by the soundproof wall, thereby avoiding the occurrence of noise damage to nearby stores and houses.

  A road cutting method according to the present invention includes a nozzle that injects water, a moving device that supports the nozzle and moves on a rail parallel to the road, and a frame that is disposed around the moving device. A step of installing a cutting unit on the road, a step of jetting water from the nozzle to cut the road, forming a water storage unit for storing water, and a step of discharging the water stored in the water storage unit It is characterized by that.

  In the present invention, the frame, the moving device, and the nozzle are quickly installed at a construction site on the road (for example, on an expansion joint) and are quickly removed from the construction site by manufacturing the cutting unit in advance.

  In the expansion joint removal method according to the present invention, the water injected from the nozzle flows into the gap portion by cutting the fixed portion to form the water storage portion and discharging the water stored in the water storage portion. In addition, the sound generated by jetting water is prevented from propagating to the gap, preventing water from falling into stores and vehicles parked under the bridge. In addition, it is possible to suppress the occurrence of a noise problem due to the sound reverberating in the gap portion. Also, the water pressure required to remove the fixed part made of concrete is not the size to cut the reinforcing bar, only the fixed part is removed, and the reinforcing bar can be reused when installing a new expansion joint. There is no need to place a new anchor. Moreover, the time required for removal is a short time (approximately 2.5 to 3 hours), and the removal work can be completed quickly and the removal cost can be reduced compared to the case of using a wire saw device. it can. Further, when a breaker is used for cutting the fixed portion, minute cracks (microcracks) are generated in the casing including the floor slab, but no microcracks are generated when cutting is performed with water pressure.

  In addition, by forming a weir on the side of the idler portion of the fixed portion, it is possible to reliably prevent water sprayed from the nozzle from flowing into the idler portion.

  In addition, even if water enters over the water storage section or weir, the water stop section prevents water from splashing downward, and stores and vehicles that are parked under the bridge It is possible to more reliably prevent water from falling on the surface.

  In addition, the depth at which the fixed part is cut can be set by appropriately adjusting the position where the water jetted from each jetting port collides, so it is possible to respond flexibly according to the design of the bridge. It can be prevented.

  In addition, since the drive of the moving device is controlled by the control device and the nozzle is positioned at a desired position near the expansion joint, it is more accurate and shorter than when the worker uses the breaker to cut the fixed portion. The fixed portion can be cut by the above, and the quality of the removal operation can be maintained constant and the removal cost can be reduced.

  Further, by supporting the nozzle at different positions along the moving axis of the moving device, the fixed portion that cannot be included in the ejection range of the nozzle supported by the one supporting portion, for example, movement of the moving device The portion of the fixed portion in the vicinity of the start position and the movement end position is cut with a nozzle supported by another support portion, and the entire fixed portion is reliably removed.

  In addition, noise generated during removal of the expansion joint can be absorbed or blocked by the soundproof wall, and noise damage to nearby stores and houses can be avoided.

  Further, by manufacturing the cutting unit in advance, the frame body, the moving device, and the nozzle are quickly installed at the construction site (for example, on the expansion joint), and are quickly removed from the construction site. Therefore, the time required for preparation before the start of the cutting operation and removal of the equipment after the end of the cutting work can be significantly reduced as compared with the conventional method in which the equipment to be used is assembled, disassembled and removed at the construction site. In addition, problems associated with leakage of water from the construction site by forming a water reservoir and draining water (for example, noise from leakage into the water from the play area and water to the stores and vehicles below the construction site) ) Can be prevented. In addition, sound leakage can be suppressed by appropriately attaching necessary components such as a soundproof sheet to the frame. In addition, when the cutting unit is operated by automatic control, the operator can cut the road only by operating the switch. Compared to when the operator uses a breaker to cut the road, The burden can be greatly reduced.

It is a top view which shows schematically the composition of the bridge near an expansion joint. It is sectional drawing in the II-II line of FIG. It is process drawing which shows the process from the removal start in the removal method of an expansion joint to moving apparatus installation. It is process drawing which shows the process from the removal start in the removal method of an expansion joint to moving apparatus installation. It is process drawing which shows the process from the removal start in the removal method of an expansion joint to moving apparatus installation. It is process drawing which shows the process from the removal start in the removal method of an expansion joint to moving apparatus installation. It is a top view which shows a moving apparatus schematically. It is a front view which outlines a collision nozzle. It is a schematic diagram which shows the drive state of a collision nozzle. It is process drawing which shows the installation operation | work of the protective frame and sound absorption panel in the removal method of an expansion joint. It is process drawing which shows the installation operation | work of the protective frame and sound absorption panel in the removal method of an expansion joint. It is a schematic enlarged view of the lower part of a protective frame and a sound absorption panel. It is a figure which shows an example of the method of installing a cutting unit in a construction place. It is a figure which shows an example of the method of installing a cutting unit in a construction place. It is process drawing which shows the cutting operation of a fixing | fixed part. FIG. 16 is a schematic side view seen from the XVI direction shown in FIG. 15. It is a front view which briefly shows the movement state of a collision nozzle. It is a top view which shows schematically the movement state of a collision nozzle. It is process drawing which shows the removal process of a weir. It is process drawing which shows the removal process of a weir. It is drawing which shows schematically the moving apparatus which supported the collision nozzle on the back-and-front slider on the opposite side to a support stand. It is drawing which shows schematically the moving apparatus which supported the collision nozzle with the support stand. It is sectional drawing which shows schematically the bridge which installed the expansion joint 3 which uses an elastic member. FIG. 3 is an enlarged cross-sectional view schematically showing the vicinity of a free space portion 2 that has been subjected to water stopping work.

Hereinafter, the present invention will be described in detail based on the drawings showing a method for removing an expansion joint according to an embodiment. In the present embodiment, the road width direction is the left-right direction, and the parallel arrangement direction of the floor slabs is the front-rear direction. FIG. 1 is a plan view schematically showing the structure of a bridge near the expansion joint, and FIG. 2 is a cross-sectional view taken along the line II-II in FIG. For the sake of explanation, FIG. 1 clearly shows the configuration embedded in the fixed portion with a solid line.
In the figure, reference numeral 1 denotes a plurality of floor slabs arranged in parallel in the front-rear direction on a bridge girder (see FIG. 3), which will be described later. The floor slabs 1 face each other with a gap 2 between them. The floor slabs 1 and 1 facing each other are connected by an expansion joint 3. A pavement 4 (for example, asphalt) is provided on the floor slab 1 except for the vicinity of the expansion joint 3.

  The expansion joint 3 is bolted to a pair of serrated portions 5 and 5 opposed to each other in the front-rear direction on the gap portion 2 so as to mesh with each other at a predetermined interval, and to each serrated portion 5 and 5. , And frames 6, 6 protruding in a direction away from the play gap portion 2. The frame 6 is embedded in a fixed portion 7 made of concrete, and is fixed to one and the other floor slabs 1 and 1, respectively. The serrated portion 5 is also embedded in the fixed portion 7 leaving the upper surface. In addition, the concrete which comprises the fixing | fixed part 7 is hardened in a short time after placement. An adhesive 8 is provided between the fixed portion 7 and the floor slab 1, and the fixed portion 7 and the floor slab 1 are fixed to each other by the adhesive 8. In addition, the expansion joint 3 mentioned above is an example, and is not limited to this, It cannot be overemphasized that the removal method which concerns on a present Example is applicable also to another type of expansion joint.

  A sealing member 9 that closes the gap and a backup member 10 that supports the sealing member 9 from below are sandwiched between the serrated portions 5 and 5. The sealing member 9 and the backup member 10 have elasticity and can absorb thermal deformation of the floor slab 1.

  Two fixing members 11, 11 having an L-shaped cross section for fixing the backup member 10 in the play space 2 are provided below the backup member 10. The fixtures 11 and 11 are arranged side by side in the front-rear direction with a gap, and are fixed to the two serrated portions 5 respectively. The fixture 11 includes a part parallel to the left and right and a part parallel to the top and bottom perpendicular to the part. The part parallel to the left and right supports the lower side of the backup member 10, and the part parallel to the top and bottom is It is bolted to the idler portion 2 side of the serrated portion 5. A seal rubber 12 for preventing water leakage is provided in a watertight manner in the gap between the fixtures 11 and 11.

  On the upper side of the frame 6, a plurality of reinforcing bars 20, 20,... A plurality of sleeve-type anchors 21, 21,..., 21 are driven into the frame 6 vertically with an appropriate distance in the front-rear direction.

  Next, a method for removing the expansion joint 3 will be described. 3-6 is process drawing which shows the process from the removal start in the removal method of the expansion joint 3 to installation of a moving apparatus.

  As shown in FIG. 3, before the expansion joint 3 is removed, the floor slab 1 installed on the upper side of each of the plurality of bridge girders 50, 50,... They are connected by an expansion joint 3 provided near the portion 2. The bridge girder 50 is also opposed to the gap portion 2. Further, the opposing bridge girders 50 are supported by the bridge pier 52 via the supports 51, 51.

  As shown in FIG. 4, in order to cure drainage, a simple weir 55 is provided on the periphery of the pier 52, and a curing sheet 56 is installed on the weir 55 and the pier 52. The curing sheet 56 extends to the upper side so as to cover the upper surface of the pier 52 and also surround the idler portion 2. The upper part of the curing sheet 56 is fixed to the bridge girder 50 via a hook 57. A suction pump 58 is provided on the curing sheet 56, and the water stored on the curing sheet 56 is sucked upward by the suction pump 58, as shown by the arrows in FIG.

  And as shown in FIG. 5, the water stop iron plate 30 for water stop is installed above the serrated part 5. Moreover, the curing iron plates 31 and 31 for curing the edge portion of the water storage section 7a (see FIG. 15), which will be described later, are installed on the pavement 4 at a position separated from the play section 2 by an appropriate length. Instead of the water-stopping iron plate 30, urethane foam for water-stopping may be applied to the serrated portion 5, and urethane foam may be further applied to the upper side of the water-stopping iron plate 30.

  Next, as shown in FIG. 6, a moving device 40 that supports the collision nozzle 41 and moves in the left-right direction and the front-rear direction is installed on the pavement 4 across the idler portion 2. The moving device 40 is installed on the pavement 4 from the transport vehicle using a crane.

FIG. 7 is a plan view schematically showing the moving device 40.
The moving device 40 includes two left and right rails 42 and 42 that are long in the left and right direction, and the left and right rails 42 and 42 are separately arranged on the front and rear sides of the play portion 2. The left and right rails 42 and 42 are respectively provided with left and right sliders 43 and 43 that move in the left and right direction. Left and right belts 44 and 44 having a large number of teeth formed along the left and right direction are provided on both upper sides of the left and right rails 42 and 42, with both ends supported. The left and right belts 44 penetrate through the left and right sliders 43. . The left and right sliders 43 rotatably support left and right sprockets 43a having the front-rear direction as an axial direction, and the left and right sprockets 43a and the left and right belts 44 are engaged with each other. Left and right motors 45 are provided on the rear side of the left and right sliders 43 located behind the idler portion 2, and the rotational power of the left and right motors 45 is transmitted to the left and right sprockets 43a. The left and right motors 45 may be provided on the front side of the left and right sliders 43 positioned in front of the gap portion 2.

  The two left and right sliders 43, 43 oppose each other in the front-rear direction, and are connected by two front and rear rails 46, 46 that are long in the front-rear direction. A front / rear slider 48 that moves in the front / rear direction is provided across the two front / rear rails 46, 46. Front and rear belts 47 and 47 having a large number of teeth formed along the front and rear direction are provided on both upper sides of the front and rear rails 46 and 46, with both ends supported. The front and rear belts 47 and 47 penetrate through the front and rear slider 48. ing. The front / rear slider 48 rotatably supports two front / rear sprockets 48a, 48a whose axial direction is the left / right direction, and the front / rear sprockets 48a, 48a mesh with the front / rear belts 47, 47. A front / rear motor 49 is screwed to the right side of the front / rear slider 48, and the rotational power of the front / rear motor 49 is transmitted to the front / rear sprockets 48a, 48a. The front / rear motor 49 may be provided on the left side of the front / rear slider 48.

  As the front / rear motor 49 rotates, the front / rear sprocket 48a moves on the front / rear belt 47, and the front / rear slider 48 moves in the front / rear direction. On the other hand, by the rotation of the left and right motor 45, the left and right sprockets 43a move on the left and right belts 44, and the front and rear rails 46 move in the left and right direction, that is, the front and rear slider 48 moves in the left and right direction. The front-rear motor 49 and the left-right motor 45 are connected to an operation panel 60 having a control circuit and operation switches. Note that a control program for executing a cutting operation is stored in advance in the control circuit. Necessary settings are made to the control circuit by operating the operation switch, and the driving of the front and rear motors 49 and the left and right motors 45 is controlled based on a drive command from the control circuit.

  The configuration in which the front / rear slider 48 moves on the two front / rear rails 46, 46 described above is merely an example of the present invention, and any configuration may be used as long as the front / rear slider 48 moves in the front / rear direction. For example, one front and rear rail 46 may be disposed between the left and right rails 42 and 42, and the front and rear slider 48 may move on the front and rear rail 46. In this case, it goes without saying that one front and rear belt 47 and one front and rear sprocket 48a are sufficient.

A collision nozzle 41 is provided on the left side of the front / rear slider 48. FIG. 8 is a front view schematically showing the collision nozzle 41.
The collision nozzle 41 includes a swivel 41a that can rotate about an axis, and two nozzle portions 41b and 41b are connected to the swivel 41a. The collision nozzle 41 is configured such that water jetted from the jetting ports 41d and 41d of the nozzle portions 41b and 41b collides, a line segment connecting the collision point and one jetting port 41d, a collision point, An angle formed by a line segment connecting to the other injection port 41d (hereinafter referred to as a collision angle α) is set in advance according to the dimensions of the expansion joint 3 and the strength of the fixing portion 7. The collision angle α can be changed by changing the direction of the injection port 41d. High pressure water is supplied to the swivel 41a, and water is jetted from the nozzle portion 41b. The collision nozzle 41 further includes an air motor 41c. The air motor 41c is driven by the supply of compressed air and rotates the swivel 41a.

  FIG. 9 is a schematic diagram showing a driving state of the collision nozzle. FIG. 9A is a plan view schematically showing the driving state of the collision nozzle 41, and FIG. 9B is a side view schematically showing the driving state of the collision nozzle 41. The inclination of the nozzle portion 41b with respect to the axial direction of the swivel 41a (hereinafter referred to as swing angle β, see FIG. 9B) is set in advance according to the dimensions of the expansion joint 3 and the strength of the fixing portion 7. The swing angle β can be changed by changing the direction of the injection port 41d.

  As shown in FIG. 9A, the collision nozzle 41 rotates around the swivel 41a, moves with the front / rear slider 48, and cuts the fixed portion 7 by the pressure of water ejected from the ejection port 41d. As shown in FIG. 9B, the collision nozzle 41 cuts the fixed portion 7 up to a substantially collision point (up to a collision point or a position about 1 cm deeper than the collision point). Therefore, by adjusting the collision angle α and the swing angle β, the cutting depth of the fixing portion 7 can be set as appropriate, and the fixing portion 7 on the back side of the reinforcing bar 20 can be cut.

FIGS. 10 and 11 are process diagrams showing the installation work of the protective frame 70 and the sound absorbing panel 72 in the method of removing the expansion joint 3, and FIG. 12 is a schematic enlarged view of the lower part of the protective frame 70 and the sound absorbing panel 72.
After installation of the moving device 40 (see FIG. 6), as shown in FIG. 10, a protective frame 70 made of a steel pipe is installed around the moving device 40, and a thickness of about 1. A soundproof sheet 71 of 0 mm is provided. A soundproof sheet 71 parallel to the left-right direction is provided with elongated rectangular openings 71a on the left and right. A rubber cover sheet 73 facing the opening 71 a is provided outside the protective frame 70. The vertical and horizontal dimensions of the cover sheet 73 are larger than the opening 71a, and the cover sheet 73 covers the opening 71a. The upper part of the cover sheet 73 is fixed to the protective frame 70, and the lower part thereof can swing back and forth with the upper part as a fulcrum. Under the opening 71a, insertion holes 71b and 71b into which two connecting members 78 and 78 for connecting a vacuum hose to be described later are respectively provided on the left and right sides (see FIG. 17 to be described later).
Then, as shown in FIG. 11, the entire protective frame 70 is surrounded by a plastic sound absorbing panel 72. The sound absorbing panel 72 includes an opening 72a facing the opening 71a. The opening 72 a is substantially the same size as the opening 71 a, and a rubber cover sheet 74 facing the opening 72 a is provided inside the sound absorbing panel 72. The vertical and horizontal dimensions of the cover sheet 74 are larger than the opening 72a, and the cover sheet 74 covers the opening 72a. The upper part of the cover sheet 74 is fixed to the sound absorbing panel 72, and the lower part thereof can swing back and forth with the upper part as a fulcrum. In addition, insertion holes 72b and 72b corresponding to the insertion holes 71b and 71b are provided in the sound absorbing panel 72.

  Under each of the protective frame 70 and the sound absorbing panel 72, an ethylene-propylene-diene rubber (EPDM) sponge 75 is provided. As shown in FIG. 12, the EPDM sponge 75 seals the space between the protective frame 70 and the sound absorbing panel 72 and the pavement 4 in a watertight manner to prevent water leakage. For this reason, it is possible to prevent water from adhering to the vehicle passing through the lane next to the work location.

The protective frame 70, the soundproof sheet 71, the moving device 40, and the collision nozzle 41 may be integrated to manufacture the cutting unit 170 in advance, and the manufactured cutting unit 170 may be installed at a construction site where the expansion joint is removed. . 13 and 14 are diagrams showing an example of a method for installing the cutting unit 170 at a construction site.
As shown in FIG. 13, the cutting unit 170 is placed on the pavement 4 by the crane 100. Then, the cutting unit 170 is jacked up, and the wheels 76, 76,... 76 are attached to the corners of the protective frame 70. Next, as shown in FIG. 14, the operator 200 moves the cutting unit 170 to a desired position. Then, the wheels 76, 76,... 76 are removed, the cutting unit 170 is installed at the construction site, and the entire cutting unit 170 is surrounded by the sound absorbing panel 72. By manufacturing the cutting unit 170 in advance, the protective frame 70, the soundproof sheet 71, the moving device 40, and the collision nozzle 41 can be quickly installed at the construction site and can be quickly removed from the construction site. Therefore, the time required for preparation before starting the cutting work and withdrawal after the end of the cutting work can be greatly reduced compared to the conventional method of assembling, disassembling and removing the equipment to be used at the construction site. The expansion joint removal work can be completed within a short time. In addition, you may manufacture the cutting unit which added the wheel 76 or the sound absorption panel 72, or both to the protective frame 70, the sound-insulation sheet | seat 71, the moving apparatus 40, and the collision nozzle 41, and integrated them.

FIG. 15 is a process diagram showing the cutting operation of the fixed portion, and FIG. 16 is a schematic side view in the XVI direction shown in FIG.
The pipes 80 and 81 for supplying compressed air and high-pressure water pass through the lower side of the cover sheets 73 and 74 and are inserted into the openings 71a and 72a. The compressor and the high-pressure pump (not shown) and the collision nozzle 41 are connected to each other. Connected. A conducting wire 61 for transmitting electric power and a driving signal passes through the lower side of the cover sheets 73 and 74 and is inserted into the opening 71a and the opening 72a, and connects the operation panel 60 to the front and rear motors 49 and the left and right motors 45. ing. Further, one end portion is protruded outside the sound absorbing panel 72 and the other end portion is protruded inside the sound absorbing panel 72, so that the connecting members 78 and 78 are inserted into the insertion holes 71b and 72b. A bellows-like vacuum hose 82 connected to a vacuum device (not shown) is connected to one end of the connecting officer 78.

  Based on the drive command from the control circuit of the operation panel 60, the drive of the front and rear motor 49 and the left and right motor 45 is controlled, and the fixed portion 7 is moved in front of and behind the idler portion 2 by water sprayed from the collision nozzle 41. Cut to depth. And the fixing | fixed part 7 is cut to the gap | interval part 2 vicinity, and the concave water storage part 7a which stores water is formed. Further, a weir 7b that is integrated with the side surface of the water storage portion 7a, is located next to the idler portion 2 in a state of protruding upward from the bottom surface of the reservoir 7a, and prevents the inflow of water from the reservoir portion 7a to the idler portion 2. Form. In the water storage section 7a, water sprayed from the collision nozzle 41 is stored and sucked up by a vacuum wheel (not shown). The weir 7b may be formed as close as possible to the gap portion 2 and may be adjacent to the gap portion 2. Since the pipes 80 and 81 and the conducting wire 61 connected to the collision nozzle 41 move left and right along the openings 71a and 72a as the collision nozzle 41 moves left and right, the collision nozzle 41 can move smoothly. Further, although steam of about 80 ° C. is generated by the water sprayed from the collision nozzle 41, the steam is sucked by the vacuum hose 82, and the steam is hardly leaked from the sound absorbing panel 72. The pipes 80 and 81 and the conducting wire 61 pass through a slight gap between the lower ends of the cover sheets 73 and 74 and the lower edges of the openings 71a and 72a. The cover sheets 73 and 74 allow the openings 71a and 72a to Since substantially the entire surface is covered, steam and noise generated inside the sound absorbing panel 72 hardly leak from the openings 71a and 72a. Further, since the cutting work is performed inside the sound absorbing panel 72, pebbles, gravel, etc. generated by the cutting work are not scattered on the lane beside the construction site, and the vehicle passing through the lane is not damaged.

  The pressure of the water sprayed from the collision nozzle 41 is set to a size that cuts the fixed portion 7 but does not cut the reinforcing bar 20, so that the reinforcing bar 20 remains. Moreover, the collision angle α and the swing angle β are set to angles at which the fixed portion 7 on the back side of the reinforcing bar 20 can be cut.

FIG. 17 is a front view schematically showing the movement state of the collision nozzle 41, and FIG. 18 is a plan view schematically showing the movement state of the collision nozzle 41. In FIG. 17, the description of the side portion of the sound absorbing panel 72 is omitted, and the description of the ceiling portion of the sound absorbing panel 72 is omitted in FIG.
The initial position of the collision nozzle 41 in one fixed part 7 is the position farthest from the expansion joint 3 in the front-rear direction, and is on the left or right end of the fixed part 7. As shown by solid line arrows in FIGS. 17 and 18, the collision nozzle 41 is moved back and forth in the left and right directions by the moving device 40 by the moving device 40 and then as shown by the broken line arrows in FIG. 18. Then, it moves a predetermined distance in the direction approaching the expansion joint 3. The reciprocating movement and the movement in the direction approaching the expansion joint 3 are repeated, and the movement of the collision nozzle 41 and the cutting of the fixed portion 7 are finished with the weir 7b remaining. Next, the collision nozzle 41 is moved in the front-rear direction beyond the expansion joint 3 by the moving device 40 and disposed at the initial position in the other fixing portion 7. And the operation | movement similar to the operation | movement mentioned above is performed, and the other fixing | fixed part 7 is cut.

  The driving of the front / rear motor 49 and the left / right motor 45 and the water pressure control of the collision nozzle 41 are executed based on a control program stored in advance in the control circuit of the operation panel 60. By simply inputting a start command to 60, the cutting operation of the fixed portion 7 is automatically executed. Therefore, the quality of the cutting work is not affected by the level of skill of the worker compared to the case where the worker cuts using the breaker, and can maintain a constant quality. The burden can be reduced, the number of workers can be reduced, and cutting work with a small number of people can be realized. The control program can change the settings relating to the water pressure and the number of rotations of the motor by operating the operation panel 60.

19 and 20 are process diagrams showing the weir 7b removal process. In FIG. 19, the description of the moving device 40 and the protective frame 70 is omitted.
After cutting each fixed part 7 leaving the weir 7b and sucking up the water stored in the water storage part 7a, the soundproof sheet 71 and the sound absorbing panel 72 are removed and the weir 7b is removed by the hand crusher 90 as shown in FIG. To do. The weir 7b may be removed with a hammer or chipper instead of the hand crusher 90. Next, the moving device 40 and the protective frame 70 are removed, and the expansion joint 3 is removed as shown in FIG. 20 so that a new expansion joint 3 can be installed. Then, a new expansion joint 3 is arranged on the free space 2 and reinforced with the existing reinforcing bars 20, concrete is cast to form a fixing portion 7, and the new expansion joint 3 is fixed to the floor slab 1. Finally, the weir 55, the curing sheet 56, the hook 57, and the suction pump 58 are removed.
The order in which the moving device 40, the protective frame 70, the soundproof sheet 71, and the sound absorbing panel 72 are removed may be appropriate for removing the weir 7b and removing and installing the expansion joint 3, and is not limited to the above order.

  Next, a case where the collision nozzle 41 is supported at a plurality of positions of the front / rear slider 48 will be described. FIG. 21 is a schematic view of a moving device in which the collision nozzle is supported by the front and rear sliders on the side opposite to the support base, and FIGS. 21A and 21B show the collision nozzle 41 on the front and rear sliders 48 on the side opposite to the support base 13. It is the side view and top view which show schematically the supported moving apparatus. FIG. 22 is a schematic view of a moving device in which a collision nozzle is supported by a support base, and FIGS. 22A and 22B are a side view and a plan view schematically showing a moving device 40 in which a collision nozzle 41 is supported by a support base 13. FIG.

As shown in FIGS. 21A and 21B, a steel material is assembled, and a support base 13 that supports the collision nozzle 41 is fixed to the right side of the front / rear slider 48 so as to surround the front / rear motor 49.
When the collision nozzle 41 is screwed to the front / rear slider 48 on the side opposite to the support base 13 (left side), the region of the fixed portion 7 indicated by the solid line hatching in FIG. 21B can be cut. However, when the left / right slider 43 is moved to the right end of the left / right rail 42, the left / right slider 43 cannot be moved to the right side of the right end of the left / right rail 42. The part 7 cannot be cut.

  When the screwing of the collision nozzle 41 and the left side of the front / rear slider 48 is released and the collision nozzle 41 is screwed by the support base 13 as shown in FIGS. 22A and 22B, the movement range of the collision nozzle 41 in the left-right direction Is biased to the right side as compared with the case where the screw is attached to the left side of the front / rear slider 48, and therefore, when screwed to the region indicated by the broken line hatching in FIG. The entire fixed portion 7 can be cut reliably without leaving the weir 7b. Further, when the moving device 40 is not configured to be able to attach and detach the collision nozzle 41 to the left and right of the front and rear slider 48, the front and rear rails 46 are removed and the front and rear rails 46 are removed in order to cut the region indicated by the broken line hatching. However, it is not necessary to perform such a large-scale work, and the work time can be shortened.

  The support 13 is designed to be small so that the load on the moving device 40 due to the injection force of the collision nozzle 41 centered on the front and rear rails 46 can be minimized and handled easily by the user. Yes. In the embodiment described above, the moving device 40 can support the collision nozzle 41 at two locations along the movement axis (left-right direction), but supports it at three or more locations along the movement axis. The structure which can be used may be sufficient.

  Next, the water stop operation when the expansion joint 3 uses an elastic member (for example, rubber) will be described. FIG. 23 is a cross-sectional view schematically showing a bridge on which the expansion joint 3 using an elastic member is installed, and FIG. 24 is an enlarged cross-sectional view schematically showing the vicinity of the idler portion 2 subjected to water stopping work. As shown in FIG. 23, the expansion joint 3 includes an expansion / contraction portion 3a made of an elastic member and disposed on the gap portion 2. The expansion / contraction portion 3a is bolted to the anchor bolt 3b embedded in the fixing portion 7. It is tightened. The anchor bolt 3 b is reinforced around its periphery by a reinforcing bar 20.

  When water stop work is performed before cutting the fixed portion 7, first, the stretchable portion 3a is lifted to release the bolting between the anchor bolt 3b and the stretchable portion 3a. And the expansion-contraction part 3a is removed, and as shown in FIG. 24, the backup member 18 which consists of sponges is arrange | positioned in the gap | interval part 2, and the urethane foam 19 is given to the upper side. Further, a still water iron plate 30 is installed on the gap portion 2. The water stop iron plate 30, the urethane foam 19 and the backup member 18 can prevent water from leaking to the lower side of the idle space 2.

  In the removal method of the expansion joint 3 according to the embodiment, the water storage portion 7a is formed, the water stored in the water storage portion 7a is drained, and further the weir 7b is formed, and then injected from the collision nozzle 41. Store water and parked under the bridge to prevent the water from flowing into the gap part 2 and to prevent the sound generated by jetting water from propagating to the gap part 2 It is possible to prevent water from falling on a vehicle or the like, and it is possible to suppress the occurrence of a noise problem due to the sound reverberating in the play section 2. Also, the water pressure required to remove the fixed portion 7 made of concrete is not large enough to cut the rebar 20, but only the fixed portion 7 is removed and the rebar 20 is re-installed when a new expansion joint 3 is installed. It can be used, and it is not necessary to place a new anchor for reinforcement. Moreover, the time required for removal is a short time (approximately 2.5 to 3 hours), and the removal work can be completed quickly and the removal cost can be reduced compared to the case of using a wire saw device. it can.

  Further, by forming a weir 7b that protrudes upward from the bottom surface of the water storage portion 7a next to the gap portion 2, the water sprayed from the collision nozzle 41 is stored in the water storage portion 7a and does not flow into the gap portion 2. . Moreover, the volume of the water storage part 7a can be enlarged as much as possible by making the weir 7b adjoin to the idler part 2. FIG.

  In addition, noise generated during removal of the expansion joint 3 can be absorbed or blocked by the soundproof wall, and noise damage to nearby stores and houses can be avoided. In addition, even if water enters the play gap 2 over the weir 7b, the water-stopping iron plate 30 and the urethane foam 19 prevent the water from splashing downward, and stores and parks installed under the bridge Thus, it is possible to more reliably prevent water from falling on a vehicle or the like.

  In addition, the collision angle α and the swing angle β of the collision nozzle 41 can be appropriately adjusted to set the depth at which the fixed portion 7 is cut. It can be prevented. Moreover, since the drive of the moving device 40 is controlled by the operation panel 60 and the nozzle is positioned at a desired position in the vicinity of the expansion joint 3, the accuracy is higher than when the worker uses the breaker to cut the fixed portion 7. The fixing part 7 can be cut well and in a short time, and the quality of the removal operation can be maintained constant and the removal cost can be reduced. Further, by using the relatively light and compact moving device 40, it is possible to improve the mobility at the time of preparation and withdrawal of work. In addition, by using general-purpose products such as H-shaped steel and square steel pipes as rails used for the moving device 40, it is possible to easily cope with field conditions.

  Further, by supporting the collision nozzle 41 at different positions along the movement axis of the moving device 40, an area of the fixed portion 7 that is not included in the movement range of the collision nozzle 41 supported by one support portion, for example, left and right The region in the vicinity of the end of the rail 42 can be cut by the collision nozzle 41 supported by another support portion, and the entire fixing portion 7 can be reliably removed.

  In addition, although the nozzle which concerns on embodiment cuts the fixed part which fixes an expansion joint, it can also cut roads other than a fixed part. For example, a nozzle may be used when cutting road pavements. In that case, the above-described advantages of using the nozzle can be enjoyed, and the advantages of these can also be enjoyed by forming the water storage section and the weir and installing the sound absorbing panel. In addition, when the cutting unit 170 is used for road paving work, the above-described advantages of using the cutting unit 170 can be enjoyed.

  The embodiment described above is an exemplification of the present invention, and the present invention can be implemented in various modified forms within the scope defined by the matters described in the claims and the description of the claims. it can.

DESCRIPTION OF SYMBOLS 1 Floor slab 2 Spacing part 3 Expansion joint 13 Support stand (support part)
DESCRIPTION OF SYMBOLS 7 Fixed part 7a Water storage part 7b Weir 20 Reinforcing bar 40 Moving device 41 Collision nozzle 41b Nozzle part 41a Swivel 41c Air motor 41d Injection port 43 Left and right slider 48 Front and rear slider (support part)
50 Bridge girder 60 Operation panel 70 Protective frame (frame)
72 Sound absorption panel (sound barrier)
170 Cutting unit

Claims (9)

Cutting the fixed part that fixes the expansion joint that connects each floor slab facing along the width direction at the gap between the floor slabs arranged side by side on the bridge girder. In the removal method of the expansion joint that removes the joint,
A step of cutting water from the nozzle to cut the fixed portion and forming a water storage portion for storing water;
Discharging the water stored in the water reservoir;
And a step of removing the expansion joint after drainage from the water storage section is completed. A method for removing the expansion joint. The water storage part is formed on the side of the idler part of the fixed part by cutting the opposite side of the idler part of the fixed part, and includes a weir that prevents inflow of water into the idler part,
The method for removing an expansion joint according to claim 1, further comprising a step of removing the weir before removing the expansion joint. The expansion joint removal method according to claim 2, wherein the weir is positioned next to the idler portion in a state of protruding upward from the water storage portion. The removal method of the expansion joint as described in any one of Claim 1 to 3 further equipped with the process of providing the water stop part which prevents a water leak above the said idle part or in the said idle part. The nozzle includes a plurality of injection ports,
The direction in which the nozzles are adjusted so that the water jetted from each jetting port collides with each other at a predetermined position, and the depth at which the fixed portion is cut by the nozzles is preset. The removal method of the expansion joint as described in any one of 1-4. 6. The method according to claim 1, further comprising a step of supporting the nozzle on a moving device that moves on a rail parallel to the floor slab, and installing the moving device on an upper side of the expansion joint. The removal method of the expansion joint as described in one. The moving device includes a plurality of support portions for supporting the nozzle on a moving shaft,
The removal method of the expansion joint according to claim 6, further comprising a step of releasing the support of the nozzle in one support part and supporting the nozzle in another support part. The method for removing an expansion joint according to any one of claims 1 to 7, further comprising a step of providing a soundproof wall around the expansion joint. A step of installing on the road a cutting unit having a nozzle for injecting water, a moving device that supports the nozzle and moves on a rail parallel to the road, and a frame disposed around the moving device; ,
A step of jetting water from the nozzle to cut the road and forming a water storage section for storing water;
And a step of discharging the water stored in the water storage section.

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