Deck cutting and separation system, and concrete deck and main girder cutting and separation method

Abstract

To efficiently cut and separate a concrete floor slab and a main girder by effectively utilizing a narrow working space under the existing floor block by utilizing an auxiliary device.SOLUTION: A floor slab cutting and separating system for cutting and separating a joint part between a concrete floor slab and a main girder of a bridge, comprises: a cutting device including a wire saw, a driven pulley around which the wire saw is wound, and a moving device which is provided with the driven pulley, forms a pair with the main girder interposed therebetween, and moves along the main girder below the concrete floor slab; an auxiliary device provided to assist the cutting and separating work of the joint part by the cutting device; and a rotational motion transmission mechanism to transmit the rotational motion of the driven pulley to the auxiliary device.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a deck cutting and separation system used when cutting and separating a joint between a concrete deck and a main girder, and a method for cutting and separating a concrete deck and a main girder using the deck cutting and separation system. [Background technology]

[0002] Bridge deck renewal work involves replacing deteriorated existing decks with new, more durable ones, and traffic must be blocked during this work. This means that construction traffic restrictions, such as road closures to general vehicles and various traffic restrictions, must be implemented, but the duration of these restrictions must be minimized to minimize the impact on existing traffic.

[0003] However, when replacing the deck with a new one, the existing deck must be removed from the existing girders, which takes a significant amount of time. In particular, removing the concrete around the shear stop of the composite girders, which were streamlined by integrating the behavior of the deck and steel girders, took longer than that of a non-composite structure.

[0004] Therefore, in order to minimize the time for traffic restrictions during construction, the inventors proposed a construction method in which all cutting equipment is located under the deck so that cutting of the existing deck for removal can begin as soon as traffic restrictions for construction begin, and filed a patent application for this method.The cutting equipment in Patent Document 1 uses a wire saw to form a cutting surface parallel to the existing girder at the haunch, which is the joint between the existing deck and the existing girder, and cuts and separates the existing deck and the existing girder. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] Patent Publication No. 2021-021227 Summary of the Invention [Problem to be solved by the invention]

[0006] According to Patent Document 1, because the work of cutting and separating the existing deck slab and existing girder is carried out underneath the existing deck slab, it is possible to shorten the traffic restriction period during deck renewal work. However, bridge structures are not necessarily uniform, with some bridges having existing decks installed at an angle perpendicular to the bridge axis relative to the existing girders, and others having low haunches, which are the joints between the existing deck slab and existing girders.

[0007] Therefore, when the cutting device is placed in a predetermined position, there is a risk that it may come into contact with the underside of the existing deck slab. In this case, it becomes necessary to perform additional, complicated work such as chipping the underside of the existing deck slab and cutting the lower reinforcement of the existing deck slab. For this reason, there has been a demand for auxiliary devices that allow the cutting device to be used appropriately under the existing deck slab, such as a device that can adjust the position of the cutting device to avoid contact with the existing deck slab.

[0008] Various devices that use wire saws to assist in the cutting and separating of existing deck slabs and existing girders are used, not limited to the cutting device of Patent Document 1. However, when a power supply is required for the device that assists in the cutting and separating work, including the power supply means makes the entire auxiliary device excessively large, occupying a large amount of work space, which creates a problem of interfering with work in the narrow space below the existing deck slab.

[0009] The present invention was developed in consideration of such problems, and its main purpose is to utilize an auxiliary device to effectively utilize the narrow working space under the existing deck, and to efficiently cut and separate the concrete deck and main girder. [Means for solving the problem]

[0010] In order to achieve this purpose, the deck cutting and separation system of the present invention is a deck cutting and separation system that cuts and separates the joint between the concrete deck and main girder of a bridge, and is characterized by comprising a cutting device that includes a wire saw, a driven pulley around which the wire saw is hung, and a moving device on which the driven pulley is mounted and which forms a pair across the main girder and moves along the main girder below the concrete deck, an auxiliary device that assists the cutting device in cutting and separating the joint, and a rotational motion transmission mechanism that transmits the rotational motion of the driven pulley to the auxiliary device.

[0011] According to the deck cutting and separation system of the present invention, the rotational motion of the driven pulley, which rotates as the wire saw travels in the extension direction, can be transmitted to the auxiliary device via a rotational motion transmission mechanism. As a result, the auxiliary device can use the transmitted rotational motion as power, eliminating the need for a power supply means and enabling a more compact design. Therefore, by using the auxiliary device, it is possible to effectively utilize the narrow working space under the existing deck and efficiently perform the work of separating the concrete deck and the main girder.

[0012] The deck cutting and separation system of the present invention is characterized in that the rotational motion transmission mechanism comprises a rotating source pulley that operates in conjunction with the driven pulley, a rotating receiving pulley that is equipped on the auxiliary device, and a rotational motion transmission belt that is wrapped around the rotating source pulley and the rotating receiving pulley.

[0013] According to the deck cutting and separation system of the present invention, the rotational motion of the driven pulley, which rotates as the wire saw travels in the extension direction, is transmitted to the rotation receiving pulley of the auxiliary device via the rotation source pulley and the rotational motion transmission belt. This makes it possible to transmit rotational motion that rotates at the traveling speed of the wire saw to the auxiliary device.

[0014] The deck cutting and separation system of the present invention is characterized in that the auxiliary device is provided with a guide roller that rotates around an axis on whose outer surface the rotary support pulley is installed, and the guide roller is positioned near the joint with the axis aligned with the main girder, and the wire saw is abutted across at a position opposite the back surface of the concrete deck.

[0016] According to the deck cutting and separation system of the present invention, the guide rollers provided on the auxiliary device can function as a wire saw extension direction changer. This allows the orientation of the moving device, which must be positioned parallel to the wire saw, to be freely adjusted by changing the extension direction of the wire saw via the guide rollers. Therefore, even if there is a risk of the moving device coming into contact with the concrete deck, it is possible to avoid contact with the concrete deck by adjusting the orientation of the moving device using the auxiliary device equipped with the guide rollers, for example by tilting it.

[0017] Furthermore, when a rotational motion transmission mechanism is provided, if a rotation receiving pulley is installed on the guide roller, the guide roller can be rotated at the speed at which the wire saw travels in the extension direction. This allows the guide roller to perform an auxiliary function in the cutting and separation work while suppressing the phenomenon in which the outer circumferential surface is cut by the traveling wire saw.

[0018] The method for cutting and separating a concrete deck and a main girder of the present invention is a method for cutting and separating a concrete deck and a main girder using the deck cutting and separation system of the present invention, characterized in that the wire saw is run in the extension direction and moved along the guide roller in the extension direction of the main girder, forming a cut surface at the joint that is approximately parallel to the main girder.

[0019] According to the method for cutting and separating a concrete deck and main girder of the present invention, even in a narrow working environment under an existing deck, the guide rollers are used to prevent loosening of the wire saw, to guide its movement direction, and as an extension direction change section, making it possible to efficiently cut and separate the concrete deck and main girder. [Effects of the Invention]

[0020] According to the present invention, by utilizing a cutting device and auxiliary device including a moving device that moves along the main girder below the concrete deck, it is possible to effectively utilize the narrow working space below the existing deck and efficiently cut and separate the concrete deck and the main girder. [Brief explanation of the drawings]

[0021] [Figure 1] 1A to 1C are diagrams illustrating a cutting and separating operation performed by the cutting device according to an embodiment of the present invention. [Figure 2] 1 is a diagram showing a deck slab cutting system according to an embodiment of the present invention. [Figure 3] 1 is a diagram showing a guide device according to an embodiment of the present invention (part 1). [Figure 4] FIG. 4 is a diagram showing a guide device according to an embodiment of the present invention (part 2). [Figure 5] 1 is a diagram showing a rotational motion transmission mechanism according to an embodiment of the present invention; [Figure 6] 3 is a view showing a first front support device according to the embodiment of the present invention. FIG. [Figure 7] 1 is a diagram showing the procedure for cutting and separating a concrete deck slab and a main girder using a deck cutting system according to an embodiment of the present invention. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0022] This invention uses a slab cutting and separation system equipped with an auxiliary device to perform the work of cutting and separating a concrete slab and main girder, which is one of the work processes carried out in road bridge slab renewal work. Below, we will explain in detail the slab cutting and separation system and the method of cutting and separating a concrete slab and main girder, using an example of cutting and separating the joint between the concrete slab and main girder using the push-cut method, with reference to Figures 1 to 7.

[0023] As shown in Figure 1, the bridge 400 has a steel main girder 401 and a concrete slab 402 placed on the main girder 401, with a haunch 404 formed on the underside of the concrete slab 402, which serves as the joint with the main girder 401. In addition, headed studs 4011 are embedded in the haunch 404 and are installed in the upper flange of the main girder 401. The headed studs 4011 are members that function to prevent displacement of the concrete slab 402 in the approximately horizontal direction (mainly in the bridge axis direction).

[0024] When carrying out deck replacement work on a composite bridge 400 in which the above-mentioned concrete deck 402 and steel main girder 401 are integrated, a cutting device 100 equipped with a wire saw 10 is first used to form a cut surface 403 on the haunch portion 404.

[0025] Specifically, while the wire saw 10, which has penetrated the haunch portion 404 in a direction perpendicular to the bridge axis, is made to travel in the extension direction, the first and second front support devices 40a, 40b that make up the cutting device 100 are moved along the main girder 401, as shown in Fig. 2. The first and second front support devices 40a, 40b will be described in detail later, and each include first to eighth driven pulleys 41a-48a, 41b-48b around which the wire saw 10 is hung. As a result, the wire saw 10 moves in the bridge axis direction along the main girder 401 while being pressed against the position within the haunch portion 404 where the cutting surface 403 is to be formed.

[0026] Then, a cut surface 403 is formed in the haunch portion 404 by the wire saw 10, and the main girder 401 is cut and separated from the concrete deck 402. After this, the concrete deck 402 that has been cut and separated from the main girder 401 is removed, and after preparatory work such as scraping is performed on the top surface of the upper flange of the main girder 401, a new deck slab is installed on the main girder 401.

[0027] The work of forming a cutting surface 403 in the haunch portion 404 using the above procedure and cutting and separating the main girder 401 and the concrete deck 402 is carried out using a deck cutting and separation system D including the above-mentioned cutting device 100, as shown in Figure 2.

[0028] <<<Deck Cutting and Separation System>> The deck cutting and separation system D comprises a cutting device 100 equipped with a wire saw 10, a guide device 300 that assists the cutting and separation work using the wire saw 10, and a rotational motion transmission mechanism 200 that transmits rotational motion from the cutting device 100 to operate the guide device 300.

[0029] It should be noted that the rotational motion transmission mechanism 200 does not necessarily have to be installed, and an auxiliary device other than the guide device 300 may be employed as long as it is a device that assists the cutting and separation work by the wire saw 10. Below, the details of the deck slab cutting and separation system D will be explained using an example in which the guide device 300 is employed as an auxiliary device and is operated using the rotational motion transmission mechanism 200.

[0030] <<Guide device>> 3(a), the guide device 300 includes a guide roller 301 against which the wire saw 10 crosses and abuts, a pair of cone members 303 connected to both ends of the guide roller 301, and a shaft 302 that supports the guide roller 301 via the cone members 303. The guide device 300 also includes an end jig 304, a suspender 305, and a bolt 306.

[0031] 3(b), shaft 302 is a core material inserted into guide roller 301, and is a long rod having shaft body 3021 and thin-diameter portions 3022 provided on both ends thereof. Each thin-diameter portion 3022 is connected to end jig 304 while passing through cone member 303, and end jig 304 and hanging tool 305 are fastened together by bolt 306.

[0032] Cone member 303 is a cylindrical body that is attached to small diameter portion 3022 of shaft main body 3021, and has a tapered surface 3031 formed on its outer circumferential surface that decreases in diameter toward the end facing guide roller 301. In addition, bearing 3032 is interposed on the inner circumferential surface side, and cone member 303 is rotatable around shaft 302 when attached to shaft 302.

[0033] Guide roller 301 is a cylindrical member that rotates around its axis, with shaft 302 as the rotation axis, and tapered surfaces 3011 are formed on the inner circumferential surfaces at both ends so that they can come into surface-to-surface contact with tapered surfaces 3031 of cone member 303. Therefore, when shaft 302 is inserted into guide roller 301 and cone member 303 is attached to narrow diameter portion 3022 of shaft 302, tapered surfaces 3011 of guide roller 301 come into contact with tapered surfaces 3031 of cone member 303, and cone member 303 is fitted in a wedge-like shape. As a result, guide roller 301 and cone member 303 can freely rotate while being supported by shaft 302 via bearings 3032, as shown in FIG. 3( c).

[0034] As shown in Figure 4(a), the above-mentioned guide device 300 is disposed near the haunch portion 404 so that the axis of the guide roller 301 is aligned with the main girder 401, and is installed on the underside of the concrete slab 402 via a hoisting device 305. The hoisting device 305 has a plurality of adjustment holes 3051, and the installation height of the guide roller 301 can be adjusted by using any of these adjustment holes 3051 to fasten the end jig 304 and the hoisting device 305 with bolts 306. The height of the guide roller 301 is adjusted to a height position where the wire saw 10 will not damage the main girder 401 and to correspond to the height position where the cutting surface 403 is formed.

[0035] Such guide roller 301 has the functions of preventing the wire saw 10 from damaging the main girder 401, guiding the wire saw 10 in the extension direction of the main girder 401 (bridge axis direction), and preventing loosening of the wire saw 10 as shown in Fig. 1, and also functions as a direction changing section for the wire saw 10. In other words, as shown in Fig. 1 and Fig. 4(b), with the guide roller 301 sandwiched between them, the haunch portion 404 side causes the wire saw 10 to extend substantially parallel to the cutting surface 403, and the cutting device 100 side changes the extension direction of the wire saw 10 so that it extends at a desired inclination angle.

[0036] Therefore, for example, as shown in Figure 1, even if the concrete deck 402 is installed at an angle perpendicular to the bridge axis relative to the main girder 401, the first front support device 40a constituting the cutting device 100 can be positioned near the underside of the concrete deck 402 without coming into contact with it.

[0037] In other words, the first front support device 40a, which is located on the side where the concrete slab 402 descends, cannot be positioned parallel to the height position of the wire saw 10 penetrating the haunch portion 404 (the position where the cutting surface 403 is formed) because there is a risk of it coming into contact with the underside of the concrete slab 402. However, by using the guide device 300 to change the extension direction of the wire saw 10 so that it is inclined diagonally downward, the first front support device 40a can be positioned in a position parallel to the wire saw 10 extending at an angle. This makes it possible to omit work such as chipping into the underside of the concrete slab 402. It also makes it possible to avoid the wire saw 10 coming into contact with and damaging the main girder 401.

[0038] On the other hand, the second front support device 40b, which is located on the side where the concrete deck 402 rises, can be positioned in a position parallel to the height position (the position where the cutting surface 403 is formed) of the wire saw 10 that penetrates the haunch portion 404. Therefore, the guide roller 301, which is located between the haunch portion 404 and the second front support device 40b, only fulfills the functions of preventing the wire saw 10 from damaging the main girder 401, guiding the wire saw 10 in the extension direction of the main girder 401 (the bridge axis direction), and preventing the wire saw 10 from slackening.

[0039] This assists the cutting device 100 in cutting and separating the concrete deck 402 and the main girder 401, and makes it possible to improve work efficiency in the narrow working environment below the concrete deck 402. As described above, the guide roller 301 is configured to be rotatable about its axis, and is rotated by the wire saw 10 that crosses and abuts it. As a result, its outer circumferential surface is cut over time by the wire saw 10. Therefore, a cylindrical member with high hardness, such as a stainless steel pipe, an iron pipe, or an SPG pipe, is suitable as a material for the guide roller 301.

[0040] Furthermore, if the guide roller 301 has been cut and worn down to the extent that it can no longer perform the above-mentioned functions, it is advisable to replace the guide roller 301. To perform the replacement work, as shown in Figure 3(c), the bolt 306, the end jig 304, and the cone member 303 are removed and disassembled. After that, the existing guide roller 301 is pulled out from the shaft 302, and a new guide roller 301 is used for reassembly.

[0041] As described above, the guide roller 301 can be configured to rotate passively due to the wire saw 10, depending on the material used and whether it is replaced at the appropriate time, or it can be actively rotated via the rotational motion transmission mechanism 200.

[0042] <<Rotational motion transmission mechanism>> 5, the rotational motion transmission mechanisms 200 are installed in pairs on both sides of the haunch portion 404. Details of the rotational motion transmission mechanisms 200 installed in the first front support device 40a and the guide device 300 will be described below as an example.

[0043] As shown in Figures 2 and 5, the rotational motion transmission mechanism 200 is a device that transmits the rotational motion of the fifth driven pulley 45a among the first to eighth driven pulleys 41a to 48a provided in the first front support device 40a to the guide device 300, and is equipped with a rotation receiving pulley 201, a rotation source pulley 202, a rotational motion transmission belt 203, and an adjustment pulley 204.

[0044] Both the rotation receiving pulley 201 and the rotation source pulley 202 are belt pulleys, and the rotation receiving pulley 201 is fixed to the outer circumferential surface of the guide roller 301 by a fixing means such as welding.

[0045] As shown in Fig. 5, the rotation source pulley 202 is provided at a position that forms the same vertical plane as the fifth driven pulley 45a provided on the first front support device 40a of the cutting device 100, together with the rotation receiving pulley 201. The rotation source pulley 202 and the fifth driven pulley 45a may be fixed coaxially as shown in Fig. 6, or pulleys made of separate members may be fixed together, or a so-called double pulley with double grooves may be used.

[0046] The rotational motion transmission belt 203 is looped around the rotation receiving pulley 201, the rotation source pulley 202, and an adjustment pulley 204 (described later), and transmits the rotational motion of the rotation source pulley 202 to the rotation receiving pulley 201. Figure 4(c) shows an example of a so-called V-belt with a V-shaped cross section. For this reason, both the rotation receiving pulley 201 and the rotation source pulley 202 employ belt pulleys with grooves corresponding to the V-belt.

[0047] The adjustment pulley 204 is a belt pulley similar to the rotation receiving pulley 201 and the rotation source pulley 202, and is arranged in a position that forms the same vertical plane together with the rotation receiving pulley 201 and the rotation source pulley 202, as shown in Figure 5. The adjustment pulley 204 is arranged so that it can move within this vertical plane, thereby making it possible to adjust the tension of the wound rotational motion transmission belt 203.

[0048] With the above configuration, when the wire saw 10 travels in its extension direction, the fifth driven pulley 45a rotates. Then, the rotational motion of the fifth driven pulley 45a is transmitted to the rotation receiving pulley 201 via the rotation source pulley 202, which rotates in conjunction with the fifth driven pulley 45a, and the rotational motion transmission belt 203. As a result, the guide roller 301 to which the rotation receiving pulley 201 is attached rotates at the speed at which the wire saw 10 travels.

[0049] Therefore, even if the traveling speed of the wire saw 10 varies during cutting and separation operation by the cutting device 100, the guide roller 301 actively rotates at the same speed. Therefore, even if the wire saws 10 are in contact with each other in a crosswise manner, it is possible to reduce the phenomenon in which the outer circumferential surface of the wire saw 10 is cut and thinned by the wire saw 10. Note that in the second front support device 40b, as shown in FIG. 2, the rotational motion of the fifth driven pulley 45b is transmitted to the guide roller 301 of the guide device 300.

[0050] The rotational motion transmission mechanism 200 having the above-described configuration is not limited to the above configuration, as long as it can transmit the rotational motion of the fifth driven pulleys 45a, 45b generated by the wire saw 10 traveling in its extension direction to each of the paired guide devices 300. For example, a chain belt may be used for the rotational motion transmission belt 203, or instead of the rotation receiving pulley 201, the rotation source pulley 202, the rotational motion transmission belt 203, and the adjustment pulley 204, a configuration may be adopted in which the rotational motion is transmitted by combining a plurality of gears.

[0051] However, considering ease of maintenance and use in a work environment where the concrete deck slab 402 and the steel main girder 401 are cut and separated (for example, where dust and cooling water are scattered), the use of a V-belt and V-pulley is preferable.

[0052] Furthermore, the rotational motion transmission mechanism 200 can be used not only for the guide device 300 but also as an auxiliary device that assists in the work of cutting and separating the concrete deck slab 402 and the main girder 401 using the cutting device 100. An example of an auxiliary device that can be used together with the rotational motion transmission mechanism 200 is a dust suction device that sucks up dust generated during cutting and separation.

[0053] In such a case, it is preferable to provide the auxiliary device with a conversion mechanism that converts the rotational motion transmitted from the rotational motion transmission mechanism 200 into another motion depending on the operation of the auxiliary device. Specifically, a mechanism that converts the rotational motion into another motion, such as a link mechanism or crank mechanism that converts it into swinging motion or linear motion, is provided. In this case, the auxiliary device can operate using a motion different from the rotational motion transmitted from the rotational motion transmission mechanism as power.

[0054] Furthermore, the rotation source pulley 202 of the rotational motion transmission mechanism 200 may be installed on another pulley that rotates in a substantially vertical direction among the first to eighth driven pulleys 41a to 48a provided on the first front support device 40a, instead of the fifth driven pulley 45a.

[0055] Furthermore, the rotational motion transmission mechanism 200 may be arranged, for example, in a substantially horizontal plane instead of a substantially vertical plane, as long as it is arranged on the same plane. In this case, instead of the fifth driven pulley 45a, any one of the first to eighth driven pulleys 41a to 48a provided in the first front support device 40a that rotates in a substantially horizontal direction may be selected, and the rotation source pulley 202 may be installed on that pulley.

[0056] The first and second front support devices 40a and 40b, which include the first to eighth driven pulleys 41a to 48a and 41b to 48b on which the rotation source pulley 202 is installed, will be described in detail below together with an overview of the cutting device 100.

[0057] ≪≪Cutting device≫≫ 2, the cutting device 100 includes a wire saw 10 formed by processing a diamond saw wire into an endless shape, first and second rear support devices 50a, 50b, first and second front support devices 40a, 40b, a storage mechanism 30, and a drive mechanism 20, around which the wire saw 10 is hung.The cutting device 100 also includes a suspension frame 70 on which the drive mechanism 20 and the storage mechanism 30 are installed, and a pair of traveling rails 60 that guide the traveling direction of the first and second front support devices 40a, 40b and the first and second rear support devices 50a, 50b.

[0058] <First front support device 40a> 6, the first front support device 40a has first to eighth driven pulleys 41a to 48a around which the wire saw 10 is wound, and a pulley frame 49 that supports them. The pulley frame 49 has a front frame 491 and a rear frame 492 that are arranged in series. The front frame 491 and the rear frame 492 each have: A moving body 493 that moves along the running rail 60 A feeder 494 for driving the moving body 493 is provided.

[0059] The feeder 494 may be provided on each of the front frame 491 and the rear frame 492 to synchronize them, or may be provided on only one of them. When the feeder 494 is provided on only one of them, the rear frame 492 or the front frame 491, which does not have the feeder 494, may be configured to pull or push.

[0060] 1, angle adjustment members 495 are installed on the undersides of the front frame 491 and the rear frame 492. This allows the front frame 491 and the rear frame 492 to be tilted so as to be parallel to the wire saw 10 when the extending direction of the wire saw 10 is changed via the guide rollers 301 of the guide device 300.

[0061] Of the front and rear frames 491 and 492 tilted in this manner, the front frame 491 has seventh and eighth driven pulleys 47a and 48a mounted on its upper surface, as shown in Fig. 2. These guide the wound wire saw 10 in a substantially horizontal direction. On the other hand, the rear frame 492 not only has first and sixth driven pulleys 41a and 46a mounted on its upper surface for guiding the wire saw 10 in a substantially horizontal direction, but also has second to fifth driven pulleys 42a to 45a mounted on its side surfaces for guiding the wire saw 10 in a substantially vertical direction.

[0062] As a result, the wire saw 10 supplied from the first front support device 40b is hooked around the eighth, seventh and sixth driven pulleys 48a, 47a and 46a and travels, and then, as shown in Figure 6, is changed direction by the fifth driven pulley 45a and then hooked around the fourth, third, second and first driven pulleys 44a, 43a, 42a and 41a.

[0063] <<Second front support device 40b>> The second front support device 40b has the same configuration as the first front support device 40a, and includes first to eighth driven pulleys 41a to 48b. The pulley stand 49 that supports these also has the same configuration.

[0064] The wire saw 10 supplied from the first rear support device 50b is wound around the first driven pulley 41b, changes direction, and travels around the second to fifth driven pulleys 42b to 45b to the second front support device 40b. After that, it changes direction and travels around the sixth to eighth driven pulleys 46b to 48b.

[0065] Regarding the cutting device 100 equipped with the above-mentioned first front support device 40a and first front support device 40b, the details of the structure are given in JP 2021-21227 A, but the outline thereof is as follows.

[0066] <Outline of cutting device> As shown in Figures 2 and 7(a), the pair of traveling rails 60 are installed in pairs with the haunch portion 404 in between, and include a guide portion 61 extending along the main girder 401, and a guide support 62 that supports the guide portion 61. The guide support 62 is installed detachably on the underside of the concrete deck 402, and suspends the guide portion 61. Also, as shown in Figures 7(b) and (c), the guide support 62 is connected to the guide portion 61 so as to be slidable, and the guide portion 61 is connected to the guide support 62 so as to be movable in the height direction.

[0067] 2, the suspension frame 70 includes a horizontal member 71 installed in a suspended state on the underside of the concrete slab 402. On the horizontal member 71, first and second twisting units 72, 74 around which the wire saw 10 is hung, a drive mechanism 20, and a storage mechanism 30 are installed. The first and second twisting units 72, 74 are both mechanisms for twisting the running direction of the wire saw 10 from a vertical direction to a vertical direction or vice versa, and include horizontal pulleys 721, 741 and vertical pulleys 722, 742.

[0068] The storage mechanism 30 stores the excess length of the wire saw 10 while maintaining a constant tension, and is a mechanism that gradually unwinds the wire saw 10 as the cutting operation of the haunch portion 404 progresses and the first and second front support devices 40a, 40b move forward. Any structure may be used as long as it has these functions, but here, a pulley holder 31 is provided in which a plurality of guide pulleys 32 that rotate vertically are arranged in a row in the height direction.

[0069] The pulley holder 31 is suspended from a horizontal member 71 of a suspension frame 70, and a direction-changing pulley 33 that rotates vertically is installed next to it. The direction-changing pulley 33 supplies the wire saw 10, which is wound around the guide pulley 32, to the drive mechanism 20. The excess length of the wire saw 10 may be wound around the multiple guide pulleys 32 and direction-changing pulleys 33 provided in the storage mechanism 30 in any way as long as a certain tension is maintained.

[0070] The drive mechanism 20 applies a constant tension and high-speed rotational force to the wire saw 10, and includes a drive pulley 21 around which the wire saw 10 is wound, a pulley guide 22 suspended from the suspension frame 70, and an elevating device 23 that moves up and down along the pulley guide 22. The elevating device 23 has the drive pulley 21 disposed on the front side facing the main girder 401, and a drive unit 24 that rotates the drive pulley 21 on the rear side. The drive pulley 21 is attached to the elevating device 23 via a horizontal shaft, and rotates vertically around the horizontal shaft to apply high-speed rotational force to the wound wire saw 10.

[0071] Further, first and second rear support devices 50a and 50b are disposed on the rearward side in the traveling direction of the first and second front support devices 40a and 40b, respectively.

[0072] 1 and 3, the first and second rear support devices 50a, 50b have first to fourth driven pulleys 51a to 54a, 51b to 54b around which the wire saw 10 is respectively hung and which rotate in the horizontal direction, and a pulley stand 55 that supports these. Although details of the pulley stand 55 are omitted, similar to the first front support device 40a and the first front support device 40b, the pulley stand 55 is equipped with a moving body that moves along the traveling rail 60, and a feed device that drives the moving body to move the first and second rear support devices 50a, 50b.

[0073] In the cutting device 100 having the above configuration, the wire saw 10, whose excess length is stored in the storage mechanism 30, is wound around the drive pulley 21. After that, the wire saw 10 is wound around the first and second driven pulleys 51a and 52a of the first rear support device 50a via the first torsion part 72, and then around the first and fourth driven pulleys 51b and 54b provided on the second rear support device 50b. Next, the wire saw 10 is wound around the first to eighth driven pulleys 41b to 48b of the second front support device 40b, and passes through the haunch portion 404.

[0074] After passing through the haunch portion 404, it is hooked around the eighth to first driven pulleys 48a to 41a of the first front support device 40a, and then hooked around the third and fourth driven pulleys 53a, 54a of the first rear support device 50a via the second torsion portion 74 and the storage mechanism 30.

[0075] As a result, when the first and second front support devices 40a, 40b are advanced along the pair of traveling rails 60, the wire saw 10 is constantly pressed against the haunch portion 404 in the intended direction of forming the cut surface 403. By operating the drive mechanism 20 in this state, the wire saw 10 travels in the extension direction and advances while widening the range in which the cut surface 403 is formed within the haunch portion 404.

[0076] <<<Method for cutting and separating concrete deck slabs and main girders using a deck slab cutting and separation system>> The following describes the procedure for forming a cutting surface 403 in the haunch portion 404 and cutting and separating the concrete deck 402 and the main girder 401 using the deck cutting and separation system D, which is equipped with the above-mentioned cutting device 100, rotational motion transmission mechanism 200, and guide device 300.

[0077] <<Preparation>> First, as shown in Fig. 2, the above-described cutting device 100 is installed on the underside of the concrete slab 402. In Fig. 2, since a pre-existing cutting surface 403 exists in the haunch portion 404, the wire saw 10 is passed through the haunch portion 404 using this cutting surface 403, and is then hooked around the first and second rear support devices 50a, 50b, the first and second front support devices 40a, 40b, the storage mechanism 30, and the drive mechanism 20. Simultaneously with or before or after these operations, the guide device 300 is assembled in the above-described procedure and installed on the underside of the concrete slab 402.

[0078] At this time, the first front support device 40a tilts the front frame 491 using the angle adjustment member 495 to prevent contact between the eighth driven pulley 48b and the concrete floor slab 402. Even if the first front support device 40a is tilted, the wire saw 10 does not affect the cutting operation because its extension direction is changed via the guide roller 301 of the guide device 300 as described above. Note that the height of the guide device 300 is adjusted so that the height position at which the guide roller 301 abuts against the underside of the concrete floor slab 402 is equal to the height position of the cutting surface 403.

[0079] A rotational motion transmission belt 203 is wound around a rotation source pulley 202 provided on the first front support device 40a of the cutting device 100 and a rotation receiving pulley 201 provided on the guide roller 301 of the guide device 300, and a rotational motion transmission mechanism 200 is provided on one side of the main girder 401. Similarly, a rotational motion transmission belt 203 is wound around a rotation source pulley 202 provided on the second front support device 40b of the cutting device 100 and a rotation receiving pulley 201 provided on the guide roller 301 of the guide device 300, and a rotational motion transmission mechanism 200 is provided on the other side of the main girder 401.

[0080] ≪Cut surface formation work≫ After the above-mentioned preparations are completed, the drive mechanism 20 of the cutting device 100 is operated to move the wire saw 10 in the extension direction. Then, the movement of the wire saw 10 rotates the fifth driven pulley 45a provided on the first front support device 40a, and accordingly, the rotation source pulley 202 of the rotational motion transmission mechanism 200 also rotates.

[0081] Therefore, the rotational motion transmission mechanism 200 can transmit rotational motion to the guide roller 301 via the rotational motion transmission belt 203 and the rotation source pulley 202. The rotational motion transmission mechanism 200 connected to the second front support device 40b functions in the same manner, so that the guide rollers 301 of the pair of guide devices 300 sandwiching the main beam 401 both rotate in the same direction as the traveling direction of the wire saw 10 at the same speed.

[0082] In this state, as shown in Figure 7(a), the first and second front support devices 40a, 40b start traveling, and the wire saw 10 forms a cut surface 403 in the haunch portion 404, expanding the range in the extension direction of the main girder 401. Thereafter, as shown in Figure 7(b), when the wire saw 10 reaches the vicinity of the suspender 305 of the guide roller 301 of the guide device 300 or the vicinity of the guide support 62 of the traveling rail 60, the traveling of the first and second front support devices 40a, 40b is temporarily stopped, and the rotation of the wire saw 10 in the extension direction is interrupted.

[0083] As shown in Figure 7(c), the guide support 62 of the traveling rail 60 is moved to avoid interference with the wire saw 10, and the guide device 300 is moved to a position forward of the first front support device 40a in the direction of travel. After this reloading operation is completed, the drive mechanism 20 is operated again, and the first and second front support devices 40a, 40b are caused to travel, and as shown in Figure 7(d), the wire saw 10 resumes forming the cut surface 403 on the haunch portion 404. These operations are repeated to form the cut surface 403 over a predetermined range.

[0084] According to the above configuration, the guide device 300 can be used to adjust the posture of the first front support device 40a to avoid contact with the concrete slab 402, thereby eliminating the need for the conventional work of chipping the underside of the concrete slab 402. Furthermore, the guide roller 301 rotates due to the rotational motion transmitted via the rotational motion transmission mechanism 200. Therefore, the guide device 300 does not require a separate drive mechanism such as a motor to provide power, which allows for compactness while reducing the phenomenon in which the outer peripheral surface where the wire saws 10 intersect and come into contact is thinned due to cutting.

[0085] In this way, the guide device 300 can be used to effectively utilize the narrow working space below the concrete slab 402, and the work of forming the cutting surface 403 can be carried out efficiently.

[0086] The deck cutting and separation system and the method for cutting and separating a concrete deck and a main girder of the present invention are not limited to the above-described embodiments, and various modifications are possible within the scope of the spirit of the present invention.

[0087] For example, in this embodiment, the cutting device 100 is used to form the cut surface 403 on the haunch portion 404 by a push-cutting method, and cut and separate the concrete deck slab 402 and the main girder 401. However, this is not limited to this, and any cutting device that includes a wire saw 10 and a driven pulley around which the wire saw is hung can also be used as a pull-cutting method cutting device. Furthermore, the wire saw 10 may or may not be endless, and further, the wire saw 10 may or may not have an excess length.

[0088] Furthermore, the rotational motion transmission mechanism 200 and the guide device 300 do not necessarily have to be arranged in pairs on both sides of the main girder 401. Furthermore, the rotational motion transmission mechanism 200 and the guide device 300 may be provided on the first and second rear support devices 50a, 50b. [Explanation of symbols]

[0089] 100 cutting equipment 10 Wire Saw 20 Drive mechanism 21 Drive pulley 22 Pulley guide 23 Lifting device 24 Drive unit 30 Storage Mechanism 31 Pulley holder 32 Guide pulley 40a First front support device (moving device) 40b Second front support device (moving device) 41a~48a 1st to 8th driven pulleys 41b~48b 1st to 8th driven pulleys 49 Pulley stand 491 Front Mount 492 Rear mount 493 Mobile 494 Feeder 495 Angle adjustment member 50a First rear support device (moving device) 50b Second rear support device (moving device) 51a to 54a 1st to 4th driven pulleys 51b~54b 1st~4th driven pulleys 55 Pulley stand 60 Running rail 61 Guide part 62 Guide support 70 Hanging stand 71 Horizontal Member 72 First Torsion 721 Horizontal Pulley 722 Vertical Pulley 73 Direction change pulley 74 Second Torsion 741 Horizontal Pulley 742 Vertical Pulley 200 Rotational motion transmission mechanism 201 Rotation receiving pulley 202 Rotation source pulley 203 Rotational motion transmission belt 204 Adjustment pulley 300 Guide device (auxiliary device) 301 Guide roller 302 Shaft 3021 Shaft body 3022 Thin diameter part 303 Cone member 304 End jig 305 Lifting equipment 306 volts 400 Bridges 401 Main girder 4011 Headed stud 402 Concrete deck 403 Cut surface 404 Haunch part (joint part) D Deck cutting and separation system

Claims

1. A deck cutting and separation system that cuts and separates a joint between a concrete deck and a main girder of a bridge, a cutting device including a wire saw, a driven pulley around which the wire saw is wound, and a moving device provided with the driven pulley, which is paired with the main girder and moves along the main girder below the concrete deck; an auxiliary device that assists the cutting device in cutting and separating the joint; a rotational motion transmission mechanism that transmits the rotational motion of the driven pulley to the auxiliary device; A deck cutting and separation system comprising:

2. The deck cutting and separating system according to claim 1, The rotational motion transmission mechanism is a rotation source pulley that interlocks with the driven pulley; a rotation receiving pulley provided on the auxiliary device; a rotational motion transmission belt wound around the rotation source pulley and the rotation receiving pulley; A deck cutting and separation system comprising:

3. The deck cutting and separating system according to claim 2, The auxiliary device includes a guide roller that rotates around an axis on the outer circumferential surface of which the rotation receiving pulley is installed, The guide roller is disposed near the joint with the axis aligned along the main girder, A slab cutting and separation system characterized in that the wire saws are abutted crosswise at a position opposite the back surface of the concrete slab.

4. A method for cutting and separating a concrete deck and a main girder using the deck cutting and separation system according to claim 3, A method for cutting and separating a concrete deck and a main girder, characterized in that the wire saw is run in the extension direction and moved along the guide roller in the extension direction of the main girder, thereby forming a cutting surface at the joint that is approximately parallel to the main girder.

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