Method for preventing water leakage in the girder end face of a concrete bridge, and wire saw device.

Abstract

This technology allows for the reliable and highly precise formation of grooves on the target surface, expanding the range of application for construction and improving work efficiency and cost-effectiveness. [Solution] The method for preventing water leakage in the girder end face of a concrete bridge includes the steps of forming grooves 20 extending in the transverse direction Z on girder end faces 10a and 10b located on both sides of the gap and facing each other, placing elastic formwork members positioned below the grooves 20 to close the gap S in the vertical direction, and filling the upper part of the formwork members with elastic filler and hardening it to make the elastic filler adhere tightly to the grooves 20. In the step of forming the grooves 20, a wire saw device 50 equipped with a wire 51 that can travel along the transverse direction Z in the gap is used, and the grooves 20 are formed by pressing the wire 51 against the girder end faces 10a and 10b.

Description

Technical Field

[0001] The present invention relates to a method for preventing leakage through the clearance at the end face of a girder of a concrete bridge and a wire saw device.

Background Art

[0002] Conventionally, clearances are provided between structures such as bridge girders and floor slabs in a bridge. Even when there are seasonal variations in the lengths of the structures due to temperature changes of each structure or the ground moves due to an earthquake or the like, the clearances are provided to avoid damage caused by collision or contact between the structures. These clearances absorb the amount of movement of each structure due to deformation of the structure. It is common to provide a drain gutter or a waterstop material in such clearances to prevent rainwater or the like from being transmitted to abutments or piers that support the superstructure via the clearances. And deterioration of abutments, piers, etc. due to corrosion by rainwater or the like is suppressed to achieve a long service life of the bridge. In such clearances, there may be a case where a waterstop material having elasticity is provided so as not to impair the function as a clearance.

[0003] By the way, in a bridge, due to damage to the expansion joint or the waterstop structure of the ground covering part, deformation caused by water leakage from the clearance part has become a major issue in maintenance management. Especially in winter, since it contains an antifreeze agent, there are many cases where it causes salt damage to the end face of the girder or the like. In a concrete bridge, since the clearance width is narrow, it is difficult to take effective water leakage countermeasure construction methods other than replacing the expansion joint. Here, in a joint part extending in the transverse direction of a concrete bridge, for example, as shown in Patent Document 1, a method is known in which a water guide gutter is installed in the joint part, and water leakage falling from the bridge deck through the joint part is treated through a water guide member in the joint.

[0004] Also, in a clearance extending along the transverse direction between the end faces of girders in the bridge axis direction of a concrete bridge, after inserting a backup material such as sponge to block the clearance, a waterstop material such as a polybutadiene-based resin is poured into the clearance to stop the water. Such a structure has been implemented. Furthermore, some systems utilize a hose-shaped gutter material with a circular cross-section, inserting it into the gap and pressurizing the inside of the gutter material to expand it, thereby improving the adhesion between the gutter end face and the gutter material and achieving a watertight effect. [Prior art documents] [Patent Documents]

[0005] [Patent Document 1] Patent Application No. 2000-064224 [Overview of the Initiative] [Problems that the invention aims to solve]

[0006] However, in the water leakage prevention treatment method described in Patent Document 1 above, the transverse distance is generally 5 to 10 m, making it difficult to accurately position the drilling hole, for example, when drilling with a diamond core. As a result, the drilling portion of the diamond core used for drilling may be misaligned in the up, down, left, or right directions, potentially damaging the reinforcing steel within the concrete of the girder.

[0007] In particular, the process of applying surface treatment to the girder end faces in narrow gaps is extremely difficult, requiring reliable and precise construction, and there was room for improvement in this respect. Furthermore, when using water for cutting in surface treatment processes, there was the problem of the cost and time required to dispose of the cutting fluid.

[0008] Furthermore, when installing waterproofing materials or gutters that have been fitted with resin and backing material, the resin may not adhere sufficiently to the flat girder end surface. As a result, repeated thermal expansion and contraction may cause the waterproofing materials or gutters to fall off or gaps to form, leading to water leakage. Therefore, reliable installation was required.

[0009] The present invention has been made in view of the above-mentioned problems, and aims to provide a method for preventing water leakage in the girder end face of a concrete bridge, and a wire saw device, which can reliably form grooves on the construction target surface with high precision, increase the degree of freedom in the scope of application of construction, and improve work efficiency and cost. [Means for solving the problem]

[0010] To achieve the above objective, Embodiment 1 of the method for preventing water leakage in gaps at the end faces of a concrete bridge girder according to the present invention is a method for preventing water leakage in gaps extending transversely between girder end faces in the bridge axis direction of a concrete bridge, comprising the steps of: forming grooves extending transversely on the girder end faces located on both sides of the gap and facing each other; arranging elastic formwork members positioned below the grooves and closing the gaps so as to divide them vertically; and filling the upper part of the formwork members with elastic filler and hardening it to make the elastic filler adhere tightly to the grooves, wherein in the step of forming the grooves, a wire saw device equipped with a wire that can travel along the transverse direction is used in the gaps, and the grooves are formed by pressing the wire against the girder end faces.

[0011] In this invention, a wire saw device is placed in the narrow gap between the end faces of concrete bridge girders, and by pressing the moving wire against the end faces of the girders, a groove extending transversely can be formed on the opposing end faces of adjacent concrete bridges. Then, a formwork member is placed at the bottom of the groove, and the elastic filler material filled on the formwork member is hardened within the groove to ensure sufficient adhesion. This prevents the elastic filler material from falling out or gaps from forming between the groove and the girder end faces and the elastic filler material, even if the gap is displaced in the axial direction of the bridge due to repeated thermal contraction of the concrete bridge.

[0012] Furthermore, in this invention, since the wire saw device is configured to press the wire toward the girder end face where the groove is to be formed, it is possible to position the pressing structure in the gap. Therefore, compared to conventional configurations in which the wire is wrapped around the object to be cut and cut by rotation and tension, the structure is not complex, and grooves can be formed with high precision and reliably on the girder end face, which is the surface to be constructed. In other words, construction can be carried out using the wire saw device even in narrow areas, thus increasing the flexibility of the scope of application for construction.

[0013] Furthermore, since the wire saw device of the present invention employs a dry method that does not discharge cutting fluid, the time and cost associated with cleaning and other treatments of cutting fluid can be reduced. In addition, by not using cutting fluid, the time required to dry the concrete surface can be reduced.

[0014] Furthermore, in a second aspect of the present invention, in a method for preventing water leakage between the girder end faces of a concrete bridge according to aspect 1, the wire saw device comprises a wire, a pressing part positioned on the opposite side of the wire from one of the pair of girder end faces that forms the groove, and pressing the wire from the other girder end face toward the one girder end face, and a guide rail that moves the pressing part along the transverse direction, wherein the groove is formed by pressing the wire traveling in the transverse direction from the other girder end face toward the one girder end face with the pressing part moving along the guide rail.

[0015] In this case, by installing a guide rail in a narrow gap and pressing a portion of the running wire against one end face of the girder using a pressing part that moves transversely along the guide rail, the concrete on the end face of the girder can be cut by the wire, forming a groove that extends continuously in the transverse direction.

[0016] Furthermore, in a third aspect of the present invention, in a method for preventing water leakage between the girder end face of a concrete bridge according to aspect 2, the pressing portion is preferably equipped with a pulley that rotates in contact with the wire, and the pulley has a guide groove formed around its entire circumference in the circumferential direction through which the wire can pass.

[0017] In this case, the wire is guided through the guide groove of the pulley, and the guide groove presses the wire against the end face of the girder. As a result, the wire, which travels in the transverse direction, can be kept at a constant height on the outer surface of the pulley without vibrating up and down, and the precision of the groove formed by the transverse direction can be improved.

[0018] Furthermore, in embodiment 4 of the present invention, in the method for preventing water leakage between the girder end face of a concrete bridge according to embodiment 3, it is preferable that the pulley is replaceable with one having a different height position in the guide groove.

[0019] In this case, multiple grooves of different heights can be easily formed by replacing the pulley with one that has a guide groove of a different height.

[0020] Furthermore, in embodiment 5 of the present invention, in the method for preventing water leakage between the girder end face of a concrete bridge according to embodiment 3 or embodiment 4, it is preferable that the pulley is replaceable with one having a different depth of the guide groove.

[0021] In this case, by replacing the pulley with one that has a different guide groove depth, it is possible to easily create grooves of different depths.

[0022] Furthermore, in embodiment 6 of the present invention, in a method for preventing water leakage between the girder end face of a concrete bridge, which is one of embodiments 2 to 5, it is preferable that the wire saw device is provided with a reaction force receiving part that takes up the reaction force caused by the pressing of the pressing part.

[0023] In this case, when the wire is pressed against one end face of the girder by the pressing portion, the reaction force receiving portion provided on the pressing portion can be pressed against the other end face of the girder to receive the reaction force. Thereby, a stable pressing force can be generated with respect to the wire by the pressing portion.

[0024] Moreover, Embodiment 7 of the present invention is a method for preventing leakage of play water at the end face of a girder of a concrete bridge according to any one of Embodiments 2 to 6. In the method, the wire saw device includes a main head portion having the pressing portion, and guide head portions disposed before and after in the transverse direction of the main head portion. The guide head portion preferably guides the running of the wire in the transverse direction.

[0025] In this case, the upstream side and the downstream side portions of the portion of the running wire that is pressed by the pressing portion are guided by the guide head portion. Therefore, the sway during the running of the wire can be suppressed and stable running is possible, and precise cutting can be performed on the end face of the girder to form a concave groove.

[0026] Moreover, Embodiment 8 of the present invention is a method for preventing leakage of play water at the end face of a girder of a concrete bridge according to any one of Embodiments 1 to 7. After forming one concave groove on the one end face of the girder using the wire saw device, the wire is disposed between the pressing portion and the other end face of the girder, and the other concave groove is formed on the other end face of the girder. It is preferable to form the concave grooves that are symmetrical about the left and right on both sides of the play.

[0027] In this case, after forming the concave groove on one end face of the girder, the pressing direction with respect to the wire is switched and installed within the play, and the concave groove is formed on the other end face of the girder, so that the concave grooves that are symmetrical about the left and right can be formed. Therefore, the elastic filler filled in the concave grooves that are symmetrical about the left and right has a symmetrical shape about the left and right, and a structure that can improve the water stop performance and prevent water leakage can be provided.

[0028] Furthermore, in aspect 9 of the present invention, in a method for preventing water leakage between the girder end face of a concrete bridge, which is one of aspects 2 to 7, it is preferable that after forming the groove, a nozzle head capable of blowing high-pressure air toward the groove is moved along the guide rail, and the groove is cleaned by blowing high-pressure air from the nozzle head toward the inner surface of the groove.

[0029] In this case, after forming a groove with a wire saw device, the nozzle head is mounted to move along the guide rail of the wire saw device, and cleaning can be performed by blowing high-pressure air from the nozzle head towards the inner surface of the groove. Since the nozzle head can move at the same height as the pressing part, a separate mechanism to guide the nozzle head is not required, which can reduce costs and improve construction efficiency.

[0030] Furthermore, in embodiment 10 of the present invention, in a method for preventing water leakage between the girder end face of a concrete bridge, which is one of embodiments 1 to 9, it is preferable that multiple inner grooves having the same diameter as the wire diameter of the wire saw device are formed at the bottom of the groove in cross-section.

[0031] In this case, by cutting each internal groove section with a wire to form multiple stages of internal grooves, it is possible to create recessed grooves with a groove width larger than the wire diameter dimension.

[0032] Furthermore, embodiment 11 of the wire saw device according to the present invention is a wire saw device for forming a groove extending in one direction on a concrete surface, comprising: a wire that can travel along the one direction; a pressing part positioned on the opposite side of the wire from the concrete surface and pressing the wire toward the concrete surface from the opposite side; and a guide rail that moves the pressing part along the one direction, wherein the groove is formed by pressing the wire traveling in the one direction toward the concrete surface from the opposite side with the pressing part moving along the guide rail.

[0033] In this invention, by installing a guide rail in a narrow space and pressing a portion of the wire running along the guide rail in one direction against the concrete surface to be cut, the concrete can be cut with the wire, forming a continuous groove extending in one direction. Because this configuration involves pressing a wire against the concrete surface to be grooved, the pressing structure can be placed in confined spaces. Therefore, compared to conventional configurations where the wire is wrapped around the object to be cut and cutting is performed by rotation and tension, it is possible to form grooves on the concrete surface with high precision and reliability without requiring a complex structure. In other words, since construction can be carried out using a wire saw device even in confined spaces, the degree of freedom in the scope of application of construction can be increased.

[0034] Furthermore, the wire saw device according to the present invention employs a dry method that does not discharge cutting fluid, thereby reducing the time and cost associated with cleaning and other treatments of cutting fluid. In addition, by not using cutting fluid, the time required to dry the concrete surface can be reduced.

[0035] Furthermore, in embodiment 12 of the present invention, in the wire saw device of embodiment 11, the pressing portion is preferably equipped with a pulley that rotates in contact with the wire, and the pulley has a guide groove formed around its entire circumference in the circumferential direction, through which the wire can pass.

[0036] In this case, the wire is guided through the guide groove of the pulley, and the guide groove presses the wire against the concrete surface. As a result, the wire, which is traveling in one direction, can be kept at a constant height without vibrating up and down on the outer surface of the pulley, thereby improving the precision of the groove formed by the wire extending in one direction.

[0037] Furthermore, in embodiment 13 of the present invention, it is preferable that the pulley in the wire saw device of embodiment 12 is replaceable with one having a different height position of the guide groove.

[0038] In this case, multiple grooves of different heights can be easily formed by replacing the pulley with one that has a guide groove of a different height.

[0039] Furthermore, in embodiment 14 of the present invention, in the wire saw device of embodiment 12 or embodiment 13, it is preferable that the pulley is replaceable with one having a different depth of the guide groove.

[0040] In this case, by replacing the pulley with one that has a different guide groove depth, it is possible to easily create grooves of different depths.

[0041] Furthermore, in embodiment 15 of the present invention, in any one of embodiments 11 to 14, it is preferable that the wire saw device is provided with a reaction force receiving part that takes up the reaction force caused by the pressing of the pressing part.

[0042] In this case, when the wire is pressed against one concrete surface by the pressing part, the reaction force receiving part provided on the pressing part can be pressed against the other concrete surface opposite the first concrete surface to obtain a reaction force. This makes it possible to generate a stable pressing force on the wire with the pressing part. [Effects of the Invention]

[0043] According to the present invention, a method for preventing water leakage between the girder end faces of concrete bridges and a wire saw device, it is possible to reliably form grooves on the construction target surface with high precision, expand the range of application for construction, and improve work efficiency and cost. [Brief explanation of the drawing]

[0044] [Figure 1] A side view from the bridge axis direction illustrating a method for preventing water leakage between bridge gaps according to an embodiment of the present invention. [Figure 2] This is a partial cross-sectional view of the construction status of the leak prevention method for gaps, seen from a transverse direction. [Figure 3]This is a cross-sectional view showing the structure for preventing water leakage in the gap between play areas. [Figure 4] This is a cross-sectional view showing the surface treatment process for preventing water leakage between gaps. [Figure 5] This is a construction flow chart for preventing water leakage in gaps. [Figure 6] This is a perspective view of a wire saw device. [Figure 7] This is a perspective view of the main head and guide head of the wire saw device, seen from the wire side. [Figure 8] This is a perspective view of the main head and guide head of the wire saw device, seen from the opposite side of the wire. [Figure 9] This is a cross-sectional view showing the relationship between the pulley, wire, and groove. [Figure 10] (a) to (c) are side views of pulleys with different guide groove height positions. [Figure 11] (a) to (c) are side views of pulleys with different guide groove depths. [Figure 12] This is a side view of the second piece of equipment used in the method for preventing water leakage between pipes. [Figure 13] This is a side view of the third work device used in the method for preventing water leakage between pipes. [Figure 14] This is a side view of the fourth piece of equipment used in the method for preventing water leakage between gaps. [Figure 15] This is a cross-sectional view showing a method for preventing water leakage between gaps. [Figure 16] This is a longitudinal cross-sectional view showing the process of installing end-end formwork members for a method of preventing water leakage between gaps. [Modes for carrying out the invention]

[0045] The following describes, with reference to the drawings, a method for preventing water leakage between the girder end faces of a concrete bridge and a wire saw device according to embodiments of the present invention.

[0046] As shown in Figures 1 and 2, the gap leakage prevention method of this embodiment involves constructing a gap leakage prevention structure 1 between the girder end faces 10a and 10b in the bridge axis direction X of the concrete bridge 10, using a wire saw device 50 to prevent leakage in the gap S extending along the transverse direction Z.

[0047] In Figure 1, the concrete bridge 10 is shown, where reference numeral 11 denotes the substructure and reference numeral 12 denotes the deck slab. As shown in Figure 2, the gap S of the concrete bridge 10 is an elongated groove-shaped gap extending in the transverse direction Z, with its end faces (girder end faces 10a, 10b) appearing on the side of the concrete bridge 10. The length direction of the gap S is the transverse direction Z. The dimension of the gap S in the bridge axis direction X (gap width) is, for example, 50 mm or more. Leakage water W (arrow shown in Figure 2) flowing through the gap S is discharged to one side in the transverse direction Z via the gap leakage prevention structure 1.

[0048] As shown in Figure 3, the gap leakage prevention structure 1 is provided in the gap S between concrete bridges 10A and 10B. The gap leakage prevention structure 1 comprises grooves 20 (20A, 20B) formed on the opposing girder end faces 10a and 10b of concrete bridges 10 (10A, 10B) adjacent in the bridge axis direction X, extending in the transverse direction Z; elastic formwork members 22 positioned below the grooves 20 to close the gap S so as to divide it in the vertical direction Y; and elastic filler material 40 that is filled on top of the formwork members 22 and other components and adheres tightly to the grooves 20 in a hardened state.

[0049] The grooves 20A and 20B on either side of the gap S have the same groove cross-sectional shape and face each other in the bridge axis direction X. That is, the height position of groove 20A on one concrete bridge 10A coincides with the height position of groove 20B on the other concrete bridge 10B.

[0050] At the bottom 20a of the recessed groove 20, multiple (in this case, three) internal groove sections 21 (21A, 21B, 21C) are formed in a cross-sectional view, arranged in the vertical direction Y. Each of the internal groove sections 21A, 21B, and 21C extends in the transverse direction Z. A formwork member 22 (formwork member) made of a rubber plate extending in the transverse direction Z is placed in the lowest internal groove section 21A. The groove depth of the recessed groove 20 (depth from the girder end faces 10a, 10b to the bottom of the internal groove section 21) is, for example, 8 to 12 mm. The height of the recessed groove 20 in the vertical direction Y (corresponding to the groove width) is, for example, 25 mm to 40 mm. The height (corresponding to the groove width) of each internal groove section 21A, 21B, and 21C is set to, for example, about 10 mm. The recessed groove 20 and the inner groove portion 21 are constructed using the wire saw device 50 shown in Figure 4.

[0051] The formwork member 22 is strip-shaped and extends in the transverse direction Z (see Figure 14). The thickness of the formwork member 22 is approximately the same as the height of the inner groove 21, for example, about 10 mm. As described above, the formwork member 22 has elasticity that allows it to be elastically deformed at least in the width direction (bridge axis direction X when installed). The formwork member 22 is positioned in the recessed groove 20 by the engagement of both rubber side edges 22b in the width direction with the inner groove 21A at the bottom of the recessed groove 20. The formwork member 22 functions as a lower formwork for the elastic filler material 40 that is filled after the formwork member 22 is installed, and also has the function of preventing the elastic filler material 40 from falling out after it has hardened. Therefore, the formwork member 22 remains in the gap S even after the elastic filler material 40 has been filled and hardened, forming the gap water leakage prevention structure 1. The formwork members 22 are constructed using the fourth work equipment 64 (see Figure 14), which will be described later.

[0052] The elastic filler 40 is filled onto the formwork member 22 of the gap S, and also into the interior of the opposing pair of grooves 20. The elastic filler 40 is made of a material such as silicone resin that can be elastically deformed in accordance with the amount of expansion and contraction of the concrete bridge 10 due to temperature changes after hardening. Preferably, the elastic filler 40 is a material that undergoes a hardening reaction after being filled onto the upper surface of the formwork member 22 that serves as the formwork.

[0053] The filling height of the elastic filler 40 from the formwork member 22 (height of the upper surface 40a) is set to be approximately the same level as the upper end 20b of the groove 20, but it may be above (as shown in Figure 3) or below the level of the upper end 20b of the groove 20. In short, it is sufficient that the elastic filler 40 is filled in such a way that it is in contact with at least a portion of the groove bottom 20a of the groove 20. The elastic filler 40 is applied using a fifth work device (not shown), which will be described later.

[0054] Next, the construction procedure for preventing water leakage between the girder end faces 10a and 10b of the concrete bridge 10 described above will be explained in detail with reference to Figure 5, etc.

[0055] As shown in Figures 1 and 4, the method for preventing water leakage in gaps in this embodiment involves constructing a gap leakage prevention structure 1, which serves as a new drainage channel, within the gap S of a narrow concrete bridge 10, and constructing it from the substructure side without requiring traffic restrictions on the bridge, using guide rails 53. First, in step S1, guide rails 53 are installed within the gap S. The height and slope of the guide rails 53 are adjusted to match the gap leakage prevention structure 1 to be constructed.

[0056] Subsequently, in each of the operations in steps S2 to S7, the pressing section 52, described later, is mounted on the guide rail 53 that constitutes the wire saw device 50 so as to be movable, and various construction machines (work equipment 60) are mounted on the guide rail 53. The gap water leakage prevention structure 1 is then constructed by moving the wire saw device 50 and the work equipment 60 along the guide rail 53 in the transverse direction Z.

[0057] In this embodiment of the method for preventing water leakage in gaps, taking into account the performance of the wire saw device 50 and the work equipment 60, concrete bridges 10 with a gap width S of 50 mm or more are targeted for application. Although concrete bridges 10 with a gap width of 50 mm or more are used as an example, it is of course possible to apply the method to concrete bridges with a gap width of less than 50 mm, provided that the size, performance, and construction method of the wire saw device 50 and the work equipment 60 are met.

[0058] As shown in Figures 2 and 3, the method for preventing water leakage in the gap includes a groove formation step (step S2) in which a groove 20 extending in the transverse direction Z is formed on the opposing girder end faces 10a and 10b of concrete bridges 10A and 10B adjacent in the bridge axis direction X, a formwork member installation step (step S5) in which an elastic formwork member 22 is placed at the bottom of the groove 20 and closes the gap S so as to divide it in the vertical direction Y, and a filling step (step S7) in which an elastic filler 40 is filled on the upper part of the formwork member 22 and hardened so that the elastic filler 40 adheres tightly to the groove 20.

[0059] As shown in Figures 1 and 4, in the guide rail installation work of step S1, a guide rail 53 is installed by connecting multiple rail materials, each manufactured to a fixed length such as 1.0 m or 2.0 m, in series, and matching the length of the gap S in the transverse direction Z.

[0060] The guide rail 53 is part of the wire saw device 50, which will be described later. The guide rail 53 is installed with a downward slope toward at least one end of the transverse direction Z. The slope of the guide rail 53 is set to, for example, about 2.0%. The guide rail 53 is made of an H-shaped steel or an I-shaped steel having an upper flange 53A with its upper surface 53a facing upward.

[0061] The guide rail 53 is supported from below by multiple (four in Figure 1) telescopic jacks 54 arranged at intervals along the transverse direction Z, and is installed at a predetermined height and gradient. The height of the guide rail 53 can be adjusted by extending or retracting each of the multiple telescopic jacks 54. Specifically, if the telescopic jacks 54 are hydraulic jacks, the telescopic jacks 54 are attached to the upper surface 11a of the substructure 11, and the telescopic jacks 54 are operated by a hydraulic pump, allowing for fine adjustment of the height (gradient) remotely. The number of telescopic jacks 54 and the type of jacks can be set arbitrarily.

[0062] As shown in Figure 1, the pressing section 52 of the wire saw device 50 and each working device 60 are pulled in the transverse direction Z by the traction device 55 and are mounted so as to be able to travel on the upper surface 53a of the upper flange 53A of the guide rail 53. Different working devices with different functions are used for each task in the process described later.

[0063] The traction device 55 has a traction wire 56 that can be unwound and retracted, and is installed at positions on both the outer sides in the transverse direction Z of the gap S on the upper surface 11a of the substructure 11. The traction wire 56 guides the pressing part 52 and the working equipment 60 of the wire saw device 50 along the guide rail 53 by unwinding and retracting the traction device 55 (see Figure 6). The traction wire 56 is provided to be movable along the transverse direction Z above the guide rail 53. The pressing part 52 of the wire saw device 50 (see Figure 6) and the working equipment 60 are connected to the tip of the traction wire 56. When the wire saw device 50 and the working equipment 60 are to be driven from the starting point side P1 (left side in Figure 1) to the ending point side P2 (right side in Figure 1), the traction wire 56 is retracted by the first traction device 55A located at the ending point side P2. When returning the pressing section 52 or working equipment 60 of the wire saw device 50 located at the endpoint P2 to the starting point P1 (left side in Figure 1), the second traction device 55B located at the starting point P1 is used to wind up the traction wire 56.

[0064] As in this embodiment, when two traction devices 55A and 55B are installed at the starting point P1 and the ending point P2, the wire saw device 50's pressing section 52 and the work equipment 60 can be moved in either direction to perform the work. Furthermore, if the work for each process is carried out by moving the pressing section 52 and the work equipment 60 of the wire saw device 50 in only one direction, the transverse direction Z, then, for example, a configuration in which one traction device 55 is provided only on the terminal side P2 may be used.

[0065] When installing the guide rail 53, marking work is performed to mark the position of the upper surface 53a of the guide rail 53 and the cutting positions of the three inner groove sections 21A, 21B, and 21C (see Figure 3) in the recessed groove 20, while taking into consideration the gradient in the transverse direction Z.

[0066] In the guide rail installation work of step S1, the protrusion of the guide rail 53 at the starting point P1 and the ending point P2, as well as the fixing position of the telescopic jack 54, are determined. Then, the telescopic jack 54 is fixed in the predetermined position, and multiple guide rails 53 are inserted into the gap S from one side to the other in the transverse direction Z, while connecting them together. After the insertion of the guide rails 53 into the gap S is complete, the level of the guide rails 53 is adjusted using the telescopic jack 54 and a laser level or the like.

[0067] Next, as shown in Figure 4, in step S2, a surface treatment process is performed to form a groove 20 using a wire saw device 50. The surface treatment process is the groove formation process described above. In the surface treatment process, the wire 51 of the wire saw device 50 is pressed against the girder end faces 10a and 10b and moved in the transverse direction Z, thereby cutting the girder end faces 10a and 10b to form a groove 20 that extends in the transverse direction Z.

[0068] As shown in Figures 6 to 8, the wire saw device 50 comprises a wire 51, a pressing section 52, and the guide rail 53 described above. The wire saw device 50 comprises a main head section 50A equipped with the pressing section 52, and a pair of guide head sections 50B positioned at intervals on both the front and rear sides of the main head section 50A in the transverse direction Z. The main head section 50A and the pair of guide head sections 50B are connected to each other by a traction wire 56 and are movable along the guide rail 53 while maintaining a constant distance from each other in the transverse direction Z.

[0069] As described above, the guide rail 53 is installed so as to extend in the transverse direction Z within the gap S. The guide rail 53 moves the main head section 50A and the guide head section 50B, which are equipped with a pressing section 52, along the transverse direction Z. The guide rail 53 is used not only for the wire saw device 50 but also when moving each work device 60 in the transverse direction Z, as will be described later.

[0070] The wire 51 is made of a material such as brass or copper-plated high-carbon steel. The wire 51 is endless and is driven by a drive device (not shown), with a portion of the wire 51 passing through the gap S in the transverse direction Z. The wire 51 is guided by the main head portion 50A and the guide head portion 50B and is provided to be able to travel on one side in the transverse direction Z.

[0071] The pressing section 52 comprises a plurality of pulleys 31 (in this case, three) and a movable body 32 that rotatably supports the plurality of pulleys 31 and also supports them so as to be movable along the guide rail 53. The number of pulleys 31 provided in the pressing section 52 is not limited to three.

[0072] The movable body 32 has a lower guide portion 321 that engages with the upper flange 53A of the guide rail 53, and an upper guide portion 322 fixed above the lower guide portion 321 via a support column 323. The lower guide portion 321 and the upper guide portion 322 support three pulleys 31 from the vertical direction Y. Each pulley 31 is supported by the lower guide portion 321 and the upper guide portion 322 with its rotation center O (see Figures 4 and 9) facing the vertical direction Y. As shown in Figure 4, the movable body 32 supported by the guide rail 53 is positioned with its width direction facing the bridge axis direction X. A wire 51 is positioned on one side of the movable body 32 in the bridge axis direction X (the girder end face 10a side on the left side of the page in Figure 4).

[0073] The pulley 31 is positioned on the opposite side of the wire 51 from one of the pair of girder end faces 10a and 10b that forms the groove 20 (the left side of the paper in Figures 4 and 9). The pulley 31 presses the wire 51 from the other girder end face 10b toward the one girder end face 10a, and rotates in contact with the wire 51. Here, the symbol F in Figure 9 indicates the direction of pressing. The rotation center O of the pulley 31 is positioned to press the wire 51 most towards the girder end face 10a. In other words, the wire 51 passing through the pulley 31 forms a groove 20 with a desired groove depth dp (described later). The pulley 31 is made of, for example, steel.

[0074] In Figure 4, the pulley 31 moves together with the moving body 32 which moves along the guide rail 53, and forms a groove 20A by pressing the wire 51, which is traveling in the transverse direction Z, from the other girder end face 10b toward the one girder end face 10a. When forming a groove 20B on the other girder end face 10b, the pulley 31 presses the wire 51, which is traveling in the transverse direction Z, toward the one girder end face 10a toward the other girder end face 10b by the pressing part 52 which moves along the guide rail 53.

[0075] Furthermore, the position in which the wire 51 cuts the girder end faces 10a and 10b is, as shown in Figure 9, only when the wire 51 passes through the pulley 31 and is pressed against the girder end faces 10a and 10b by the pulley 31. Therefore, by moving the main head portion 50A equipped with the pressing portion 52 on the guide rail 53 (see Figure 6), a groove 20 continuous in the transverse direction Z can be formed on the girder end faces 10a and 10b.

[0076] As shown in Figure 9, a guide groove 31a (see Figures 7 and 8) is formed on the outer circumferential surface 31b of the pulley 31, allowing the wire 51 to pass through the entire circumference. The groove depth dp of the guide groove 31a is determined by the wire diameter dw of the wire 51, the groove depth dm of the groove 20 to be formed, and the pressing distance L between the outer circumferential surface 31b of the pulley 31 and the girder end face 10a. For example, the groove depth dp of the pulley 31 is set to satisfy equation (1). Here, the pressing distance L is the position (maximum pressing position) where the wire 51 is pressed most firmly against the groove 20 side in the width direction (bridge axis direction X) by the guide groove 31a of the pulley 31, and is the distance between the outer surface 31b of the pulley 31 and the girder end face 10a. dp = dw - dm - L ... (1)

[0077] As shown in Figures 7 and 8, the lower guide portion 321 and upper guide portion 322 of the movable body 32 are each provided with a reaction force receiving portion 33 to receive the reaction force caused by the pressing portion 52. The reaction force receiving portion 33 is provided on the side in the width direction opposite to the side through which the wire 51 of the pressing portion 52 passes. In other words, as shown in Figure 4, when the wire 51 forms a groove 20 on one girder end face 10a, the reaction force can be received by pressing the reaction force receiving portion 33 against the other girder end face 10b. In this embodiment, a leaf spring is used for the reaction force receiving portion 33.

[0078] Each pulley 31 is detachably attached to the moving body 32 and is replaceable. For example, pulleys 31 can be appropriately selected and replaced with those having different height positions of the guide grooves 31a, as shown in Figures 10(a) to (c). The pulleys 31A, 31B, and 31C shown in Figures 10(a) to (c) show examples of cases where the height position of the guide grooves 31a is different. The pulley 31A shown in Figure 10(a) has the guide groove 31a on the upper side. The pulley 31B shown in Figure 10(b) has the guide groove 31a in the center in the vertical direction. The pulley 31C shown in Figure 10(c) has the guide groove 31a on the lower side. Note that by using the pulley 31A with the guide groove 31a on the upper side upside down, it can be used interchangeably with the pulley 31C with the guide groove 31a on the lower side. In the case of the recessed groove 20 of this embodiment, which has three stages of internal grooves 21A, 21B, and 21C as described later, the work can be carried out sequentially by replacing the pulley 31 with one that has a different height position of the guide groove 31a.

[0079] Furthermore, for example, the pulley 31 can be appropriately selected and replaced with one having a different guide groove depth 31a (groove depth dp as described above), as shown in Figures 11(a) to (c). The pulleys 31D, 31E, and 31F shown in Figures 11(a) to (c) are examples of cases where the guide groove depth 31a is different. The pulley 31E shown in Figure 11(a) has a guide groove depth 31a that is smaller than, for example, the wire radius. The pulley 31E shown in Figure 11(b) has a guide groove depth 31a that is equal to, for example, the wire radius. The pulley 31F shown in Figure 11(c) has a guide groove depth 31a that is larger than the wire radius.

[0080] As shown in Figure 6, the guide head section 50B is positioned in front of and behind the main head section 50A in the transverse direction Z, and guides the movement of the wire 51 in the transverse direction Z. As shown in Figures 7 and 8, the guide head section 50B includes a guide roller 57 and a guide body 58 that rotatably supports the guide roller 57 and is also movably supported along the guide rail 53.

[0081] The guide body 58 has a lower guide portion 581 that engages with the upper flange 53A of the guide rail 53, and an upper guide portion 582 fixed above the lower guide portion 581 via a support column 583. The guide roller 57 is supported from the vertical direction Y by the lower guide portion 581 and the upper guide portion 582. The guide roller 57 is supported by the lower guide portion 581 and the upper guide portion 582 with its center of rotation facing the vertical direction Y.

[0082] Similar to the pulley 31, a guide groove 57a is formed on the outer circumferential surface 57b of the guide roller 57, extending around its entire circumference. The guide roller 57 rotates around its center of rotation when the wire 51 comes into contact with the guide groove 57a, guiding the wire 51 in the transverse direction Z. In other words, the guide head portion 50B guides the upstream and downstream portions of the wire 51 that are pressed against the pressing portion 52 as it travels.

[0083] Next, in the cleaning step S3 shown in Figure 5, as shown in Figure 12, the second work device 62 is used to remove cutting debris, slag, etc., adhering to the groove 20 cut in step S2. Note that the wire saw device 50 used in this embodiment is a dry type, so no slag is generated.

[0084] The second work device 62 comprises a base 621 and a cleaning nozzle 622 (nozzle head) supported on the base 621 and having a nozzle 622A. The base 621 is flat and is movably placed on the upper surface 53a of the upper flange 53A of the guide rail 53. The width dimension (length dimension in the bridge axis direction X) of the base 621 is set to be smaller than the bridge axis direction X dimension of the gap S. During the cleaning process, the second work device 62 is positioned on the guide rail 53 with the nozzle 622A of the cleaning nozzle 622 facing the direction of movement (transverse direction Z).

[0085] In the cleaning process, the second work equipment 62 is placed on the guide rail 53, and the second work equipment 62 is moved from the starting point P1 to the ending point P2 using the traction device 55 (see Figure 1) while high-pressure air is blown from the nozzle 622A of the cleaning nozzle 622, thereby cleaning the girder end faces 10a and 10b where the groove 20 is formed with high-pressure air.

[0086] Next, in the primer application step S4 shown in Figure 5, as shown in Figure 13, the primer is applied to the groove 20 that was cleaned in step S3 using the third work device 63.

[0087] The third work device 63 comprises a base 631, a spray gun 632 for application supported on the base 631, and a primer pump (not shown) for pressurizing and supplying primer to the spray gun 632. The base 631 is flat and is movably mounted on the upper surface 53a of the upper flange 53A of the guide rail 53. The width dimension (length dimension in the bridge axis direction X) of the base 631 is set to be smaller than the bridge axis direction X dimension of the gap S. The spray gun 632 has a nozzle 632A for spraying primer and a supply port 632B to which a hose connected to the primer pump is connected. When applying primer, the third work device 63 is positioned on the guide rail 53 with the nozzle 632A of the spray gun 632 facing the end point P2 in the direction of movement (transverse direction Z).

[0088] In the primer application process, after drying and curing in the cleaning process of step S3, the third work equipment 63 is placed on the guide rail 53, and while spraying primer from the nozzle 632A of the spray gun 632, the third work equipment 63 is moved from the starting point P1 to the ending point P2 using the traction device 55 (see Figure 1), thereby applying primer to the girder end faces 10a and 10b where the groove 20 is formed.

[0089] Next, in the formwork member installation process of step S5 shown in Figure 5, as shown in Figures 14 and 15, the formwork member 22 is installed in the groove 20 to which the primer was applied in step S4 using the fourth work device 64. In the formwork member installation work in which the formwork member 22 is installed, the formwork member tip 22a of the formwork member 22 is gripped by the fourth work device 64 placed on the guide rail 53, and the fourth work device 64 is moved toward the terminal side P2 while gripping, thereby pulling and positioning the formwork member 22 into the lower inner groove 21A of the groove 20. The purpose of installing the formwork member 22 is to function as a lower formwork for filling with elastic filler 40 in a later process, and to prevent the filled elastic filler 40 from falling out after it hardens.

[0090] The fourth working device 64 comprises a base 641 movably supported on the upper flange 53A of the guide rail 53, and a formwork member gripping portion 642 supported on the base 641. The base 641 is flat and slidably placed on the upper surface 53a of the upper flange 53A of the guide rail 53. The base 641 is provided with locking grooves 641a that lock the upper flange 53A from both sides in the width direction. The width dimension of the base 641 (length dimension in the bridge axis direction X) is set to be smaller than the bridge axis direction X dimension of the gap S.

[0091] The formwork member gripping section 642 comprises a lower base 642A and an upper pressing piece 642B that presses down on the formwork member 22 with the formwork member tip 22a interposed between the lower base 642A and the upper pressing piece 642B. The upper pressing piece 642B is detachably fixed to the lower base 642A by bolts. The formwork member gripping section 642 is positioned such that the rubber side edges 22b at both widthwise ends of the gripped formwork member 22 are at a height that faces the lowest inner groove 21A of the recessed groove 20. The formwork member 22 gripped by the formwork member gripping section 642 is pulled into the gap S and installed with the formwork member tip 22a fixed to the formwork member gripping section 642.

[0092] In the formwork member installation process, after the primer application process in step S4, the fourth work device 64 is placed on the guide rail 53, and while the formwork member gripping portion 642 grips the tip portion 22a of the formwork member, the fourth work device 64 is moved from the starting point P1 to the ending point P2 using the traction device 55 (see Figure 1), thereby pulling the formwork member 22 into the gap S and installing it. Subsequently, the formwork member 22 is cut at a position where it protrudes, for example, about 10 cm from the gap S, and the upper retaining piece 642B is detached from the lower base 642A at the formwork member gripping portion 642 to release the tip portion 22a of the formwork member. The formwork member 22, released from the formwork member gripping portion 642, is fixed in a predetermined position in the groove 20 by the rubber side edges 22b on both the left and right sides fitting into the inner groove portion 21 of the groove 20.

[0093] Next, as shown in Figure 16, in the end formwork installation step S6, end formwork members 23 are installed at both ends in the transverse direction Z of the elastic filler material 40 (see Figure 3), which will be filled in a later step (step S7). The end formwork members 23 are manufactured from, for example, thin steel plates to match the shape of the concrete bridge 10, the cross-sectional shape of the gap S, and the gap width. The end formwork members 23 are used when filling the elastic filler material 40 and are removed after construction.

[0094] Next, as shown in Figure 3, in the filling step of step S7, the elastic filler material 40 is filled using the formwork member 22 installed in step S5 and the toe formwork member 23 (see Figure 16) installed in step S6 as formwork using a fifth working device (not shown). The fifth working device is moved in the transverse direction Z along the formwork member 22 installed on the guide rail 53, thereby filling the filling area R surrounded by the formwork member 22 and the toe formwork member 23 with the elastic filler material 40.

[0095] The fifth work device is a frame-shaped member having a filling / discharging section at one end, and is movably mounted on the formwork member 22 by a traction device 55 shown in Figure 1. The filling / discharging section is connected by a hose to a filling pump located outside the filling area. The filling pump is equipped with a hopper. The filling / discharging section discharges the elastic filler 40 that has been pumped from the filling pump. The filling pump is supplied with elastic filler 40 such as silicone resin, whose mixing ratio has been confirmed and whose main agent and hardener have been stirred in a stirrer, and then pumped to the filling / discharging section of the fifth work device.

[0096] In the filling process, after the end-end formwork member installation step S6, a fifth working device (not shown) is placed on the guide rail 53 (on the formwork member 22). Then, while the elastic filler 40 pumped from the filling pump is being discharged from the filling discharge section, the fifth working device is moved from the starting point P1 to the ending point P2 using the traction device 55, thereby filling the filling area R on the formwork member 22 with the elastic filler 40 as shown in Figure 3. At this time, for example, by installing a micro camera or the like at the filling discharge section of the fifth working device, it is possible to adjust the movement speed by the traction device 55 while checking the discharge and filling status. The filling height of the elastic filler 40 (height to the top surface 40a) can be set as appropriate, but it is set to a height at which the groove 20 is filled with the elastic filler 40. In this embodiment, the elastic filler 40 is filled up to a position above the groove 20. As a result, the elastic filler 40 is filled into the groove 20, providing sufficient adhesive strength and shear performance, and preventing the elastic filler 40 from falling out.

[0097] Subsequently, in step S8, after the elastic filler 40 filled in the filling area R has hardened and cured, the toe formwork member 23 and the guide rail 53 are removed. Specifically, the telescopic jack 54 for adjusting the rail height is depressurized and the cylinder is lowered, and the guide rail 53 is pulled out from the gap S while being dismantled. With the above steps, the construction of the gap water leakage prevention structure 1 is completed. After the gap leakage prevention structure 1 is installed, a drainage treatment structure for the end of the flow, which includes drainage pipes and catch basins connected to the gap leakage prevention structure 1, will be installed, but a detailed explanation will be omitted here.

[0098] Next, the method for preventing water leakage at the end face of the girder of the concrete bridge and the operation of the wire saw device 50 will be explained in detail based on Figures 1 to 16 described above. In this embodiment, a wire saw device 50 is placed in the narrow gap S between the girder end faces 10a and 10b of the concrete bridge 10, and by pressing the running wire 51 against the girder end faces 10a and 10b, a groove 20 extending in the transverse direction Z can be formed on the opposing girder end faces 10a and 10b of adjacent concrete bridges 10A and 10B. A formwork member 22 is then placed below the groove 20, and the elastic filler material 40 filled on the formwork member 22 is hardened within the groove 20 to ensure sufficient adhesion. This prevents the elastic filler material 40 from falling out or gaps from forming between the groove 20 and the girder end face 10a and the elastic filler material 40, thus preventing water leakage, even if the gap is displaced in the bridge axis direction X due to repeated thermal contraction of the concrete bridge 10.

[0099] Furthermore, in this embodiment, since the wire saw device 50 is configured to press the wire 51 toward the girder end faces 10a and 10b that are the targets for groove formation 20, it is possible to place the pressing structure in the gap S. Therefore, compared to the conventional configuration in which the wire 51 is wrapped around the object to be cut and cut by rotation and tension, the structure is not complex, and the groove 20 can be formed with high precision and reliably on the girder end face 10a, which is the surface to be worked on. In other words, since the wire saw device 50 can be used even in narrow areas, the degree of freedom in the scope of application of the work can be increased.

[0100] Furthermore, the wire saw device 50 of this embodiment employs a dry method that does not discharge cutting water, thus reducing the time and cost required for cleaning and other treatments of cutting water. In addition, by not using cutting water, the time required to dry the concrete surface can be reduced.

[0101] Furthermore, in this embodiment, the wire saw device 50 includes a wire 51, a pressing part 52 positioned on the opposite side of the wire 51 from one of the pair of girder end faces 10a and 10b that forms the groove 20, and which presses the wire 51 from the other girder end face 10b toward the one girder end face 10a, and a guide rail 53 that moves the pressing part 52 along the transverse direction Z. The pressing part 52 moving along the guide rail 53 presses the wire 51 traveling in the transverse direction Z from the other girder end face 10b toward the one girder end face 10a to form the groove 20. Therefore, by installing the guide rail 53 in a narrow gap S and pressing a portion of the running wire 51 against one girder end face 10a using a pressing portion 52 that is moved transversely in the Z direction along the guide rail 53, the concrete of the girder end face 10a can be cut by the wire 51, forming a groove 20 that extends continuously in the transverse direction Z.

[0102] Furthermore, in this embodiment, the pressing portion 52 includes a pulley 31 that rotates in contact with the wire 51. The pulley 31 has a guide groove 31a formed around its entire circumference, through which the wire 51 can pass. Therefore, the wire 51 is guided by the guide groove 31a of the pulley 31 as it travels, and the guide groove 31a presses the wire 51 against the girder end faces 10a and 10b. As a result, the wire 51 traveling in the transverse direction Z can be kept at a constant height on the outer circumferential surface 31b of the pulley 31 without vibrating up and down, thereby improving the accuracy of the groove 20 that extends in the transverse direction Z and is formed.

[0103] Furthermore, in this embodiment, it is preferable that the pulley 31 is replaceable with one having a different height position of the guide groove 31a. With this configuration, multiple grooves 20 of different heights can be easily formed by replacing the pulley 31 with one having a guide groove 31a of a different height.

[0104] Furthermore, in this embodiment, the pulley 31 can be replaced with one having a different depth of guide groove 31a. With this configuration, grooves 20 of different depths can be easily formed by replacing the pulley 31 with one having a different guide groove 31a depth.

[0105] Furthermore, in this embodiment, the wire saw device 50 is equipped with a reaction force receiving part 33 that takes up the reaction force caused by the pressing part 52. Therefore, when the pressing portion 52 presses the wire 51 against one girder end face 10a, the reaction force receiving portion 33 provided on the pressing portion 52 can be pressed against the other girder end face 10b to obtain a reaction force. This allows the pressing portion 52 to generate a stable pressing force against the wire 51.

[0106] Furthermore, in this embodiment, the wire saw device 50 includes a main head section 50A equipped with a pressing section 52, and guide head sections 50B positioned before and after the main head section 50A in the transverse direction Z. The guide head sections 50B guide the movement of the wire 51 in the transverse direction Z. Therefore, the upstream and downstream portions of the wire 51 that are pressed by the pressing portion 52 are guided by the guide head portion 50B. As a result, vibration of the wire 51 during its movement can be suppressed, enabling stable movement, and allowing for high-precision cutting of the girder end faces 10a and 10b to form the grooves 20.

[0107] Furthermore, in this embodiment, after forming one groove 20 on one girder end face 10a using the wire saw device 50, the wire 51 is placed between the pressing portion 52 and the other girder end face 10b to form the other groove 20 on the other girder end face 10b, thereby forming symmetrical grooves 20 on both sides of the gap S. Therefore, after forming a groove 20 on one girder end face 10a, the direction of pressing against the wire 51 is reversed within the gap S and installed, and a groove 20 is formed on the other girder end face 10b, thereby creating a symmetrical groove 20. As a result, the elastic filler material 40 that fills the symmetrical groove 20 has a symmetrical shape, improving watertightness and providing a structure that can prevent water leakage.

[0108] In this embodiment, after forming the groove 20, a cleaning nozzle 622 capable of blowing high-pressure air towards the groove 20 is moved along the guide rail 53, and the groove 20 is cleaned by blowing high-pressure air from the cleaning nozzle 622 towards its inner surface. Therefore, after forming the groove 20 with the wire saw device 50, the cleaning nozzle 622 is mounted to move using the guide rail 53 of the wire saw device 50, and the groove 20 can be cleaned by blowing high-pressure air from the cleaning nozzle 622 toward the inner surface of the groove 20. Since the cleaning nozzle 622 can move at the same height as the pressing part 52, a separate mechanism to guide the cleaning nozzle 622 is not required, which can reduce costs and improve construction efficiency.

[0109] Furthermore, in this embodiment, multiple inner grooves 21 are formed in the groove bottom 20a of the recessed groove 20, with a cross-sectional view showing that the grooves have the same diameter as the wire diameter of the wire saw device 50. Therefore, by cutting each internal groove 21 with the wire 51 to form multiple stages of internal grooves 21, it is possible to form a recessed groove 20 with a groove width larger than the wire diameter dimension.

[0110] As described above, the method for preventing water leakage in the girder end face of a concrete bridge and the wire saw device 50 according to this embodiment can reliably form grooves 20 on the work surface with high precision, expand the range of application for construction, and improve work efficiency and cost.

[0111] The embodiments of the method for preventing water leakage between the girder end faces of a concrete bridge and the wire saw device according to the present invention have been described above. However, the present invention is not limited to the embodiments described above and can be modified as appropriate without departing from the spirit of the invention.

[0112] For example, the above-described embodiment shows an example in which the wire saw device 50 is used as a method for preventing water leakage in the gaps at the end faces of the girders of a concrete bridge, but the wire saw device 50 can also be used for other construction work.

[0113] Furthermore, the pressing portion 52 of the wire saw device 50 is not limited to having a pulley 31 as in this embodiment. In short, any configuration that presses the wire 51 against the surface of the groove 20 to be formed from the opposite side of that surface is sufficient. Furthermore, it is possible to omit the reaction force receiving portion 33 as in this embodiment, and the reaction force receiving portion 33 is not limited to the leaf spring exemplified in this embodiment.

[0114] Furthermore, in this embodiment, multiple internal groove sections 21 are formed in cross-sectional view at the bottom 20a of the groove 20, but it is also possible to omit the multiple internal groove sections 21.

[0115] In this embodiment, the formwork member 22 (formwork member) is placed in the lowest inner groove portion 21A of the inner groove portion 21, but it may also be configured in which it is not placed in the inner groove portion 21A.

[0116] In this embodiment, the guide rail 53 is supported from below by a plurality of telescopic jacks 54 and is provided so as to be height-adjustable by the telescopic jacks 54. However, the height of the guide rail 53 is not limited to being adjusted by such telescopic jacks 54.

[0117] The shape of the guide rail 53 is not limited to the above embodiment. In other words, it is not limited to a guide rail 53 having an upper flange 53A with its upper surface 53a facing upward.

[0118] In this embodiment, a formwork member 22 made of a strip-shaped rubber sheet extending in the transverse direction is used as the formwork member, but it is not limited to a rubber sheet, and other materials may be used as the formwork member.

[0119] Furthermore, it is possible to replace the components in the above-described embodiments with well-known components as appropriate, without departing from the spirit of the present invention. [Explanation of symbols]

[0120] 1. Structure to prevent water leakage between gaps 10, 10A, 10B Concrete Bridges 10a, 10b girder end faces 20, 20A, 20B groove 20a groove bottom 21 Inner groove section 22 Formwork members 23. Formwork member 31 Pulley 31a Guide groove 31b Outer surface 32 Mobile Units 33 Reaction force receiving section 40 Elastic filler 50 Wire saw device 50A Main Head Section 50B Guide Head Section 51 Wire 52 Pressing part 53 Guide rail 53A Upper flange 53a Top side 57 Guide roller 57a Guide groove 58 Guide Body 60 Work equipment 62 2nd work equipment 63 Third work equipment 64 4th work equipment 622 Cleaning nozzle (nozzle head) R filling area S Shortstop X Bridge axis direction Y vertical direction Z-direction (transverse direction)

Claims

1. A method for preventing water leakage in gaps extending transversely between girder end faces in the bridge axis direction of a concrete bridge, wherein A step of forming grooves extending in the transverse direction on the girder end faces located on both sides of the gap and facing each other, A step of arranging an elastic formwork member that is positioned at the lower part of the groove and closes the gap so as to divide it vertically, The process includes filling the upper part of the formwork member with an elastic filler and hardening it to make the elastic filler adhere tightly to the groove, A method for preventing water leakage in the girder end face of a concrete bridge, wherein in the step of forming the groove, a wire saw device equipped with a wire that can travel along the transverse direction is used in the gap, and the groove is formed by pressing the wire against the girder end face.

2. The wire saw device is The aforementioned wire and, A pressing portion is positioned on the opposite side of the wire from one of the pair of girder end faces that forms the groove, and presses the wire from the other girder end face toward the first girder end face, The pressing portion is provided with a guide rail that moves along the transverse direction, A method for preventing water leakage between the girder end faces of a concrete bridge according to claim 1, wherein the pressing part moves along the guide rail to press the wire traveling in the transverse direction from the other girder end face toward the one girder end face, thereby forming the groove.

3. The pressing portion includes a pulley that rotates in contact with the wire, The method for preventing water leakage at the end face of a girder of a concrete bridge according to claim 2, wherein the pulley has a guide groove formed around its entire circumference in the circumferential direction through which the wire can pass.

4. The method for preventing water leakage in the gap at the end face of a girder of a concrete bridge according to claim 3, wherein the pulley can be replaced with one that has a different height position of the guide groove.

5. The method for preventing water leakage at the girder end face of a concrete bridge according to claim 3, wherein the pulley is replaceable with one having a different depth of guide groove.

6. The method for preventing water leakage in the gap at the end face of a girder of a concrete bridge according to claim 2, wherein the wire saw device is provided with a reaction force receiving part that takes the reaction force caused by the pressing of the pressing part.

7. The wire saw device is The main head portion having the aforementioned pressing portion, The main head portion comprises guide head portions positioned before and after the main head portion in the transverse direction, The method for preventing water leakage in the gap at the end face of a girder of a concrete bridge according to claim 2, wherein the guide head portion guides the wire's movement in the transverse direction.

8. A method for preventing water leakage in a gap at the end face of a girder of a concrete bridge, according to claim 2, wherein after forming one groove on one girder end face using the wire saw device, the wire is positioned between the pressing portion and the other girder end face to form the other groove on the other girder end face, thereby forming symmetrical grooves on both sides of the gap.

9. A method for preventing water leakage between the girder end face of a concrete bridge, according to claim 2, wherein after forming the groove, a nozzle head capable of blowing high-pressure air toward the groove is moved along the guide rail, and the groove is cleaned by blowing high-pressure air toward the inner surface of the groove from the nozzle head.

10. A method for preventing water leakage between the girder end face of a concrete bridge according to claim 1, wherein multiple inner grooves are formed at the bottom of the groove, in cross-sectional view, having the same diameter as the wire diameter of the wire saw device.

11. A wire saw device for forming a groove extending in one direction on a concrete surface, A wire that can travel along the aforementioned one direction, A pressing portion is positioned on the opposite side of the concrete surface from the wire, and presses the wire toward the concrete surface from the opposite side, The pressing portion is provided with a guide rail that moves along the one direction, A wire saw device that forms a groove by pressing the wire, which is traveling in one direction, from the opposite side toward the concrete surface using the pressing part that moves along the guide rail.

12. The pressing portion includes a pulley that rotates in contact with the wire, The wire saw device according to claim 11, wherein the pulley has a guide groove formed around its entire circumference in the circumferential direction, through which the wire can pass.

13. The wire saw device according to claim 12, wherein the pulley is replaceable with one having a different height position of the guide groove.

14. The wire saw device according to claim 12, wherein the pulley is replaceable with one having a different depth of guide groove.

15. The wire saw device according to claim 11, further comprising a reaction force receiving portion that takes up the reaction force caused by the pressing of the pressing portion.

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