Removal method for the upper bed version

Abstract

The objective is to provide a method for removing upper deck slabs that can efficiently remove upper deck slabs 12 installed near railway track 2 within a limited working time. [Solution] A method for removing an upper deck 12 installed near a railway track 2, which is removed by cutting it with an endless wire saw 6a, characterized in that it includes a temporary support step (step S101) in which the upper deck 12 to be removed is supported from below by a lifting trolley 5, a cutting step (step S106) in which a wire saw 6a, covered with an open cross-section protective body 7 that extends along a desired extension cutting line L1 of the upper deck 12, cuts the upper deck 12 along the extension cutting line L1, and a removal step (step S107) in which the separated upper deck 12 is removed at a predetermined location.

Description

Technical Field

[0001] The present invention relates to a method for removing a floor slab by cutting it with a wire saw and removing it, such as a floor slab of a box culvert buried near a track such as under a railway line.

Background Art

[0002] When damage due to aging or fatigue occurs in a floor slab of a box culvert buried underground, the floor slab may be cut with an endless wire saw and then replaced with a new floor slab or re-cast and remade.

[0003] At this time, as a method for cutting a concrete floor slab, for example, in Patent Document 1, which cuts near the boundary between the floor slab and the steel girder, while moving a cutting device arranged on a rail extending in the bridge axis direction in the bridge axis direction, a method of cutting the floor slab with a wire saw of a cutting device traveling in a direction perpendicular to the bridge axis is disclosed.

[0004] Furthermore, in Patent Document 1, it is stated that by covering the gantry of the cutting device arranged across both ends in the direction perpendicular to the bridge axis of the floor slab with a protective sheet, the protective sheet can also be moved following the movement of the cutting device.

[0005] By the way, when cutting and removing the floor slab of a box culvert buried near a track such as under a railway line, in a state where the floor slab to be removed is supported, an operator enters the construction site after the railway line is closed, and a series of work processes such as cutting preparation, cutting, and removal are carried out within the limited working time when the railway line is closed.

[0006] Specifically, at a construction site for removing the floor slab of a box culvert buried near a track such as under a railway line, many work processes such as preventing the scattering of fragments generated by cutting onto the railway line, installing a wire saw, cutting the floor slab, moving the floor slab, and cleaning up after removal are carried out within the limited working time when the railway line is closed.

[0007] However, depending on the conditions surrounding the construction site, additional time may be required for tasks such as preventing the scattering of debris or removing the upper deck slab after cutting. Therefore, in such construction sites, there was a need to reduce the man-hours required to remove the upper deck slab and to remove it efficiently within a limited time. [Prior art documents] [Patent Documents]

[0008] [Patent Document 1] Japanese Patent Publication No. 2023-37401 [Overview of the project] [Problems that the invention aims to solve]

[0009] In view of the above-mentioned problems, the present invention aims to provide a method for removing upper decks that can efficiently remove upper decks installed near railway tracks within a limited working time. [Means for solving the problem]

[0010] This invention relates to a method for removing an upper deck installed near a track by cutting it with an endless wire saw, characterized in that it includes a temporary support step of supporting the upper deck to be removed from below with a lifting trolley, a cutting step of the wire saw, covered with a protective body having an open cross-section shape that extends along a desired cutting line of the upper deck, cutting the upper deck along the cutting line, and a removal step of removing the separated upper deck.

[0011] The term "upper deck installed near the track" refers to an upper deck installed beneath the track, or an upper deck installed adjacent to the track. The protective body described above is a long member that has sufficient strength to withstand damage from fragments of the upper deck scattered during cutting or from a broken wire saw, and is, for example, a channel steel. Removing the separated upper deck slab as described above means transporting the upper deck slab to a designated location different from where it was cut and removing it there, or removing the upper deck slab at the location where it was cut.

[0012] According to this invention, since the wire saw traveling along the cutting line is covered by a protective body, the scattering of fragments of the upper deck slab during cutting and the scattering of wire saw fragments during breakage can be contained within the protective body. This allows the upper deck removal method to control the range of scattering of fragments from the upper deck and wire saw, thereby reducing the time required to remove scattered fragments.

[0013] Furthermore, while covering a wire saw with a large protective sheet requires the installation of a support structure and the deployment of the sheet, the upper deck removal method allows the wire saw to be covered simply by moving the protective body, thus simplifying the installation and removal of the protective body.

[0014] Therefore, the upper deck removal method reduces the man-hours required for installing protective structures and cleaning up after removal, allowing for the efficient removal of upper decks installed near the tracks within a limited working time.

[0015] In one aspect of this invention, the protective body may be made of channel steel. This configuration allows for cost reduction of the protective structure by using highly versatile channel steel. Furthermore, since the scattering of fragments can be suppressed by the weight of the protective body itself, even without fixing it to the upper deck slab, the upper deck slab removal method can reduce the man-hours required for installing the protective body.

[0016] This allows the upper deck removal method to suppress cost increases and to remove upper decks installed near the tracks more efficiently. In addition, even if unintended malfunctions occur in the wire saw, such as breakage during the cutting of the upper deck slab, the upper deck slab removal method ensures the safety of workers through a robust protective structure.

[0017] In another aspect of this invention, after the temporary support step, a continuous core forming step may be performed in which a hole is drilled into the lower surface of the upper floor slab to a predetermined depth that does not penetrate the upper floor slab, thereby forming a continuous core on the cutting line. The continuous core mentioned above refers to a continuous core formed over the entire cutting line, or a continuous core formed in part of the cutting line, etc.

[0018] With this configuration, in the cutting process, the remaining portion of the continuous core only needs to be cut with a wire saw, thus reducing the man-hours required for the cutting process compared to when a continuous core is not formed. Therefore, the upper deck removal method can remove the upper deck installed near the track more efficiently.

[0019] In another aspect of this invention, after the temporary support step, a continuous core forming step is performed in which the lower surface of the upper deck is drilled to a predetermined depth that does not penetrate the upper deck, and a continuous core is formed on the cutting line along the intersecting direction that intersects the extension direction of the track, and the cutting step may be a step in which the cutting line along the extension direction is cut with the wire saw, and the cutting line along the intersecting direction is cut by the lowering of the lifting trolley.

[0020] The continuous cores mentioned above refer to continuous cores composed of boreholes of a predetermined depth, continuous cores composed of boreholes of a predetermined depth and through-holes penetrating the upper deck slab, and so on. Cutting the above cutting line by the descent of the lifting trolley means that the remaining portion of the continuous core is fractured and cut by the weight of the upper deck, or by the weight of a heavy object placed on the upper deck and the weight of the upper deck itself fracture and cut the remaining portion of the continuous core.

[0021] This configuration allows for the formation of a continuous core along the cutting line in the intersecting direction, thereby reducing the thickness of the upper deck slab along the cutting line in the intersecting direction. Therefore, when the lifting trolley is lowered, the upper deck slab removal method can cause the thinned portion along the cutting line in the intersecting direction to break, for example, due to the weight of the upper deck slab itself.

[0022] Thus, even when the upper floor slab removal method cuts a part of the upper floor slab installed near the track so as to cut out the part, the upper floor slab can be cut along a cutting line in the crossing direction without using a wire saw. Furthermore, since the continuous core is formed while the upper floor slab is supported by the lifting carriage, the upper floor slab removal method can form the continuous core in advance even outside the time period when the railway line is closed, for example.

[0023] Therefore, compared with the case where both the cutting line along the extending direction and the cutting line along the crossing direction are cut with a wire saw while the railway line is closed, for example, the upper floor slab removal method can reduce the man-hours required for the cutting process performed within the limited working hours when the railway line is closed. Thus, even when the upper floor slab removal method cuts a part of the upper floor slab so as to cut out the part, the upper floor slab installed near the track can be removed more efficiently.

[0024] Also, as an aspect of this invention, in the removal step, as the separated upper floor slab is carried out along the carrying-out direction toward a predetermined place, after the temporary support step, a continuous core forming step is performed in which the lower surface of the upper floor slab is drilled at a predetermined depth that does not penetrate the upper floor slab to form a continuous core on the cutting line along the carrying-out direction, and the cutting step may be a step in which the cutting line along the crossing direction that intersects the carrying-out direction is cut with the wire saw, and the cutting line along the carrying-out direction is cut by the lowering of the lifting carriage.

[0025] The above continuous core refers to a continuous core composed of excavation holes of a predetermined depth, a continuous core composed of excavation holes of a predetermined depth and through holes penetrating the upper floor slab, and the like. Cutting the above cutting line by the lowering of the lifting carriage means breaking and cutting the remaining part of the continuous core by the self-weight of the upper floor slab, or breaking and cutting the remaining part of the continuous core by the self-weight of a heavy object placed on the upper floor slab and the self-weight of the upper floor slab.

[0026] This configuration allows for the formation of a continuous core along the cutting line in the removal direction, thereby reducing the thickness of the upper deck slab along the cutting line in the removal direction. As a result, when the lifting trolley is lowered, the upper deck slab removal method can cause the thinned portion along the cutting line in the removal direction to break, for example, due to the weight of the upper deck slab itself.

[0027] Furthermore, by cutting the cutting line along the removal direction by fracturing a continuous core, the upper deck removal method allows for a wider gap between the cut upper deck and the remaining portion in the intersecting direction compared to when the cutting line along the removal direction is cut with a wire saw.

[0028] Therefore, when transporting the separated upper deck slab to a designated location, the upper deck slab removal method can prevent the transport of the separated upper deck slab in the transport direction from being hindered, for example, by contact between opposing cut surfaces in intersecting directions.

[0029] As a result, even when removing a portion of the upper deck slab by cutting it out and transporting it to a designated location, the separated upper deck slab can be transported smoothly, allowing for more efficient removal of upper deck slabs installed near the tracks.

[0030] In another aspect of this invention, the cutting step may be a step of cutting the upper floor slab while the protective body is covered with a protective sheet. With this configuration, for example, the protective sheet can prevent fragments of the upper deck or broken wire saw fragments from scattering through the gap between the protective body and the upper deck. Therefore, the upper deck removal method can reliably reduce the amount of work required to remove scattered fragments and reliably ensure the safety of the workers.

[0031] In another aspect of this invention, the removal step may be a step of moving the lifting trolley that supports the separated upper floor slab to a predetermined location using a chill wheel operated by a worker. This configuration eliminates the need for power devices and other equipment to move the lifting trolley to a designated location. As a result, the upper deck removal method can save space by reducing the installation area required for the equipment that moves the lifting trolley, and can also reduce the cost required to remove the upper deck.

[0032] Furthermore, by, for example, moving the upper deck slab to a designated location away from the vicinity of the tracks, the upper deck slab removal method allows the upper deck slab to be loaded onto a vehicle or other means and transported away after the track closure is lifted, thus reducing the amount of work that can be performed within the limited working time while the tracks are closed.

[0033] As a result, the upper deck removal method not only allows for the more efficient removal of upper decks installed near the tracks within a limited working time, but also reduces the burden on workers performing the work within that limited time.

[0034] In another aspect of this invention, the upper deck is configured to be positioned below the track, and the cutting step may be a step of cutting the upper deck with the wire saw covered by the protective body along the cutting line that does not intersect the track.

[0035] With this configuration, the wire saw and protective body do not intersect the track extending in the direction of extension, thus preventing damage to the track due to contact with the wire saw or protective body, and also facilitating the installation of the wire saw and protective body. [Effects of the Invention]

[0036] The present invention provides a method for removing upper decks that can efficiently remove upper decks installed near the tracks within a limited working time. [Brief explanation of the drawing]

[0037] [Figure 1] A cross-sectional view showing the cross-section of the underground passage in a vertical section along the direction of extension. [Figure 2] A cross-sectional view showing the cross-section of an underpass in a vertical section along the width direction. [Figure 3] A schematic diagram illustrating the general cutting lines of the upper floor slab in a plan view. [Figure 4] A flowchart showing the process flow in the upper deck removal method. [Figure 5] An explanatory diagram illustrating the temporary receiving process. [Figure 6] An explanatory diagram illustrating the general structure of a continuous core from a bottom view. [Figure 7] An explanatory diagram illustrating the general structure of a continuous core in cross-section. [Figure 8] An explanatory diagram illustrating the installation process of the cutting device. [Figure 9] An explanatory diagram illustrating the protective process. [Figure 10] An explanatory diagram illustrating the cutting process. [Figure 11] An explanatory diagram illustrating the movement process. [Figure 12] An explanatory diagram illustrating the removal process. [Figure 13] An explanatory diagram illustrating the transfer process in another embodiment. [Figure 14] An explanatory diagram illustrating the transfer process in another embodiment. [Modes for carrying out the invention]

[0038] One embodiment of this invention will be described below with reference to the drawings. The upper deck removal method in this embodiment is a method of removing the upper deck 12 in the underpass 1 beneath the railway tracks 2 by cutting it with a wire saw 6a. This upper deck removal method will be explained using Figures 1 to 12.

[0039] Figure 1 shows a cross-sectional view of the underground passage 1 in a vertical section along the extension direction X, Figure 2 shows a cross-sectional view of the underground passage 1 in a vertical section along the width direction Y, Figure 3 shows a schematic diagram illustrating the general cutting line of the upper deck slab 12 in a plan view, and Figure 4 shows a flowchart illustrating the process flow in the upper deck slab removal method.

[0040] Furthermore, Figure 5 shows an explanatory diagram illustrating the temporary support process, Figure 6 shows an explanatory diagram illustrating the general outline of the continuous core 12a from a bottom view, Figure 7 shows an explanatory diagram illustrating the general outline of the continuous core 12a from a cross-sectional view, and Figure 8 shows an explanatory diagram illustrating the cutting device installation process.

[0041] In addition, Figure 9 shows an explanatory diagram illustrating the protection process, Figure 10 shows an explanatory diagram illustrating the cutting process, Figure 11 shows an explanatory diagram illustrating the movement process, and Figure 12 shows an explanatory diagram illustrating the removal process.

[0042] Furthermore, in Figure 3, track 2 is depicted using rails and sleepers for clarity. Furthermore, arrow X in the figure indicates the direction along the extension direction of track 2 (hereinafter referred to as extension direction X), and arrow Y in the figure indicates the direction approximately perpendicular to extension direction X in a plan view (hereinafter referred to as width direction Y).

[0043] First, as shown in Figures 1 and 2, the underground passage 1 is composed of a box culvert buried underground, forming an overpass that is erected underground along the extension direction X of the railway line 2. Within the internal space S of this underground passage 1, there is a road 3 that extends along the width direction Y of the railway track 2.

[0044] Furthermore, as shown in Figure 2, track 2 is arranged to pass above underpass 1 at a predetermined distance, and two tracks are arranged side by side in the width direction Y. In other words, the underpass 1 is constructed near the railway tracks 2 so as to straddle the road 3, which extends in the width direction Y of the railway tracks 2, along the extension direction X of the railway tracks 2.

[0045] Specifically, as shown in Figures 1 and 2, the underpass 1 consists of a pair of side walls 11 facing each other in the extension direction X of the railway track 2, and an upper deck 12 installed at a height above the girder that allows, for example, a person to pass through.

[0046] In this method of removing the upper deck slab 12 of the underground passage 1, as shown in Figure 3, in a plan view, the upper deck slab 12 is divided into multiple removal blocks B of a predetermined size (three removal blocks B in this embodiment) at predetermined intervals in the width direction Y.

[0047] Here, the removal block B of the upper floor slab 12 is defined as the portion enclosed in a plan view by a cutting line (hereinafter referred to as the extension direction cutting line L1), which is a virtual straight line extending in the extension direction X at positions separated by a predetermined interval in the width direction Y, and a pair of cutting lines (hereinafter referred to as the width direction cutting lines L2), which are virtual straight lines extending in the width direction Y through positions separated by a predetermined interval from the boundary 1a with the side wall 11 toward the other side wall 11.

[0048] In this embodiment, the upper deck slab 12 of the underpass 1 is cut into each removal block B using a wire saw 6a, which will be described later. Then, the cut removal blocks B are moved to a predetermined location P (see Figure 5) spaced apart from the underpass 1 in the width direction Y, and removed.

[0049] In this embodiment, the three removal blocks B are designated as the first removal block B1, the second removal block B2, and the third removal block B3, starting from the leftmost side in the width direction Y (the left side in Figure 2), and are removed in the order of the first removal block B1, the second removal block B2, and the third removal block B3.

[0050] Next, we will describe in detail the method for removing the upper deck slab in this embodiment. First, in the upper deck removal method, for example, with the underpass 1 closed to traffic, materials and equipment are brought into the internal space S of the underpass 1 during the daytime or nighttime hours, and materials and equipment are brought onto the upper deck 12 during the hours when the railway tracks are closed.

[0051] Subsequently, in the upper deck removal method, as shown in Figure 4, a temporary support process is carried out at the construction site during the daytime or nighttime to support the upper deck 12 from below for each removal block B (step S101). Specifically, as shown in Figure 5, the workers first lay a pair of rails 4 extending in the width direction Y on the road 3 in the internal space S of the underpass 1, and then assemble two lifting trolleys 5 that support the upper deck 12 on the rails 4.

[0052] Although a detailed explanation will be omitted, this lifting platform 5 is constructed by assembling multiple wheels on the lower part of a frame that is roughly shaped like a grid in plan view, and multiple journal jacks on the upper part of the frame. Once the two lifting trolleys 5 are assembled, the workers move the two lifting trolleys 5 along the rails 4, as shown in Figure 5, and position them below the first removal block B1, which is to be removed first, and the second removal block B2, which is to be removed second.

[0053] Furthermore, the workers raise the journal jacks of the two lifting trolleys 5 to support the undersides of the first removal block B1 and the second removal block B2 from below, thereby completing the temporary support process. Once the temporary support process is complete, the upper deck removal method proceeds to a cutting preparation process for cutting the removal block B, as shown in Figure 4 (step S102).

[0054] Specifically, the cutting preparation process involves the following steps in this order: a continuous core formation step (step S103) in which a continuous core 12a is formed on the upper deck slab 12; a cutting device placement step (step S104) in which the cutting device 6 is positioned; and a protective step (step S105) to suppress the scattering of fragments during cutting. In the upper deck removal method, the continuous core formation process is carried out during daytime or nighttime hours, while the cutting equipment installation and protection processes are carried out during times when the railway tracks are closed.

[0055] More specifically, in the continuous core formation process of step S103, the worker forms a continuous core 12a on the widthwise cutting line L2 of the first removal block B1 using a drilling machine (not shown) as shown in Figures 5 and 6.

[0056] Specifically, the worker drills holes in the lower surface of the upper deck 12 to a predetermined depth that does not penetrate the upper deck 12, thereby forming a continuous core 12a and completing the continuous core formation process. At this time, the worker drills holes of the predetermined depth so that they are connected to each other to form the continuous core 12a. Furthermore, the thin-walled portion between the upper surface of the upper floor slab 12 and the bottom of the continuous core 12a is left as the retained portion.

[0057] Subsequently, in the cutting device installation process of step S104, worker M, as shown in Figure 8, core-drills near both ends of the extension cutting line L1 of the first removal block B1 to form two through-holes 12b through which the wire saw 6a of the cutting device 6 is inserted.

[0058] Furthermore, worker M positions the cutting device 6 for cutting the upper deck 12 directly below the extension cutting line L1 of the first removal block B1. Then, as shown in Figure 8, worker M routes the endless wire saw 6a so as to wrap around the upper deck 12 along the extension cutting line L1.

[0059] More specifically, worker M completes the installation process of the cutting device by passing the wire saw 6a of the cutting device 6 through one through hole 12b, the upper surface of the upper floor slab 12, and the other through hole 12b in that order, thereby wrapping it around the upper floor slab 12.

[0060] Once the cutting device installation process is complete, in the protective process of step S105, the worker places a protective body 7, made of horizontal grooved steel extending in a predetermined direction, on the upper surface of the upper deck 12 so as to cover the wire saw 6a passing through the upper surface of the upper deck 12, as shown in Figure 9. Furthermore, as shown in Figure 8, the protective body 7 is a channel steel having a length X in the extension direction from one side wall 11 to the other side wall 11.

[0061] Specifically, the worker uses heavy machinery to position the protective body 7, with its opening facing downwards, above the upper deck slab 12 so that the longitudinal direction of the protective body 7 is approximately aligned with the extension cutting line L1. Then, worker M places the protective body 7 on the upper surface of the upper deck slab 12 so that the wire saw 6a is positioned in the internal space formed by the protective body 7 and the upper deck slab 12.

[0062] Furthermore, the workers complete the protection process by covering the protective body 7, which is placed on the upper deck slab 12, with a protective sheet 8 that is long in the extension direction X. Furthermore, when removing the third removal block B3, which is located on the far side in the width direction Y in Figure 3, the upper deck removal method skips the cutting device installation step S104 and the protection step S105.

[0063] Once the preparation process for cutting is complete, in the upper deck removal method, as shown in Figure 4, the cutting process of cutting the upper deck 12 with a wire saw 6a that is covered by the upper deck 12 and the protective body 7 is carried out during the time when the railway line is closed (step S106). More specifically, worker M operates the cutting device 6 to rotate the endless wire saw 6a, thereby cutting along the extension cutting line L1 on the upper deck 12. In this process, the fragments generated by the cutting of the upper deck 12 are scattered inside the protective body 7, which is covered with a protective sheet 8.

[0064] Then, when the upper slab 12 is cut by the wire saw 6a, the first removal block B1 is connected to the side wall 11 of the underground passage 1 by the remaining portion between the upper surface of the upper slab 12 and the bottom of the continuous core 12a, where the widthwise cutting line L2 is located.

[0065] Once the cutting with the wire saw 6a is complete, the workers remove the protective body 7 and protective sheet 8, clean up by removing any debris, and then, as shown in Figure 10, shorten the journal jacks of the lifting trolley 5 by a predetermined length shorter than the thickness of the upper floor slab 12.

[0066] At this point, the remaining portion of the upper deck 12 breaks due to the weight of the first removal block B1, and as the journal jacks of the lifting trolley 5 descend, the first removal block B1 separates from the side wall 11 of the underpass 1 and moves downward.

[0067] Once the cutting process is complete, the upper deck removal method performs a removal process in which the separated first removal block B1 is removed from the cutting site, as shown in Figure 4 (step S107). Specifically, the removal process consists of a moving process (step S108) in which the separated first removal block B1 is moved to a predetermined location P, and a removal process (step S109) in which the moved first removal block B1 is divided and removed, performed in this order during daytime or nighttime hours.

[0068] More specifically, in the movement process of step S108, worker M connects the chill wheels 9 to both ends of the lifting platform 5 in the width direction Y via chains (not shown), as shown in Figure 11.

[0069] Subsequently, the two workers M operate the till wheels 9 almost simultaneously, as shown in Figure 11, to move the first removal block B1 to the designated location P indicated by the dashed line in the figure. In this process, the lifting trolley 5 moves along the rails 4 laid on the road 3, towards the discharge direction Y1, which is one side of the width direction Y.

[0070] Specifically, one of the two workers M operates the chill wheel 9 on the side opposite to the removal direction Y1 of the first removal block B1 to loosen the tension of the chain, while the other worker M operates the chill wheel 9 on the side of the removal direction Y1 to pull the lifting trolley 5, thereby moving the first removal block B1 toward the removal direction Y1.

[0071] Once the first removal block B1 is transported to a designated location P, in the transport process of step S109, worker M cuts the first removal block B1 into sections using a wire saw, for example, along roughly grid-like cutting lines in plan view, as shown in Figure 12.

[0072] Furthermore, worker M moves a portion of the divided and cut first removal block B1 from road 3 using heavy machinery such as a crane, and loads it onto transport vehicles. Worker M then repeats the process of dividing and cutting the first removal block B1 and moving the divided and cut portions of the first removal block B1 until the removal of the first removal block B1 from the construction site is completed.

[0073] In this way, the upper deck removal method removes the upper deck 12 in the underpass 1 near the railway track 2 by repeating the process from step S101 to step S109 until the removal of the three removal blocks B is completed.

[0074] As described above, the upper deck removal method of this embodiment is a method of removing the upper deck 12 installed near the railway tracks 2 by cutting it with an endless wire saw 6a. This upper deck removal method involves a temporary support step (step S101) in which the upper deck 12 to be removed is supported from below by a lifting trolley 5.

[0075] Furthermore, in the upper deck removal method, a wire saw 6a covered with an open-section protective body 7 that extends along the desired extension cutting line L1 of the upper deck 12 performs a cutting process (step S106) in which the upper deck 12 is cut along the extension cutting line L1. Subsequently, the upper deck removal method involves a removal process (step S107) in which the separated upper deck slab 12 is removed.

[0076] With this configuration, since the wire saw 6a running along the extension cutting line L1 is covered by the protective body 7, the scattering of fragments of the upper deck 12 due to cutting and the scattering of fragments of the wire saw 6a due to fracture can be contained within the protective body 7. As a result, the upper deck removal method can control the range of scattering of fragments from the upper deck 12 and wire saw 6a, thereby reducing the time required to remove scattered fragments.

[0077] Furthermore, while covering the wire saw 6a with a large protective sheet requires the installation of a support frame for the protective sheet and the deployment of the protective sheet, the upper deck removal method allows the wire saw 6a to be covered simply by moving the protective body 7, thus making the installation and removal of the protective body 7 easier.

[0078] Therefore, the upper deck removal method reduces the man-hours required for protective processes and cleanup after removal, allowing for the efficient removal of the upper deck 12 installed near the railway track 2 within a limited working time.

[0079] Furthermore, since the protective body 7 is made of channel steel, the upper deck removal method allows for cost reduction of the protective body 7 by using highly versatile channel steel. Furthermore, since the scattering of fragments can be suppressed by the weight of the protective body 7 even without fixing it to the upper deck slab 12, the upper deck slab removal method can reduce the man-hours required for the protection process.

[0080] As a result, the upper deck removal method can suppress cost increases and more efficiently remove the upper deck 12 installed near the railway track 2. In addition, even if an unintended malfunction occurs in the wire saw 6a, such as breakage during the cutting of the upper deck slab 12, the upper deck slab removal method ensures the safety of workers through the robustly constructed protective body 7.

[0081] Furthermore, in the upper deck removal method, after the temporary support process, a continuous core formation process (step S103) is performed in which a hole is drilled into the lower surface of the upper deck 12 to a predetermined depth that does not penetrate the upper deck 12, and a continuous core 12a is formed on a widthwise cutting line L2 along the widthwise direction Y that intersects the extension direction X of the railway track 2.

[0082] The cutting process involves cutting the extension direction cutting line L1 along the extension direction X with a wire saw 6a, and cutting the extension direction cutting line L1 along the width direction Y by lowering the lifting trolley 5.

[0083] With this configuration, by forming a continuous core 12a on the widthwise cutting line L2 along the width direction Y, the thickness of the upper deck slab 12 on the widthwise cutting line L2 can be reduced. Therefore, when the lifting trolley 5 is lowered, the upper deck slab removal method can cause the thinned portion (remaining portion) on the widthwise cutting line L2 to break due to the weight of the upper deck slab 12.

[0084] As a result, even when the upper deck removal method involves cutting a portion of the upper deck 12 installed near the railway tracks 2, the upper deck 12 can be cut along the widthwise cutting line L2 without using a wire saw 6a. Furthermore, since the continuous core 12a is formed with the upper deck 12 supported by the lifting trolley 5, the upper deck removal method allows the continuous core 12a to be formed in advance even outside of the time when the railway tracks are closed.

[0085] Therefore, compared to, for example, cutting both the extension direction cutting line L1 and the width direction cutting line L2 with a wire saw 6a while the railway tracks are closed, the upper deck removal method can reduce the man-hours required for the protective and cutting processes to be performed within the limited working time while the railway tracks are closed. As a result, the upper deck removal method allows for more efficient removal of the upper deck 12 installed near the railway tracks 2, even when a portion of the upper deck 12 is cut out.

[0086] Furthermore, in the removal process, assuming that the separated upper deck slab 12 is transported along the transport direction Y1 toward a predetermined location P, the upper deck slab removal method involves, after the temporary support process, drilling holes in the lower surface of the upper deck slab 12 to a predetermined depth that does not penetrate the upper deck slab 12, and performing a continuous core formation process (step S103) to form a continuous core 12a on a widthwise cutting line L2 along the transport direction Y1.

[0087] The cutting process involves cutting the extension direction cutting line L1 along the extension direction X that intersects the discharge direction Y1 with a wire saw 6a, and cutting the width direction cutting line L2 along the discharge direction Y1 by lowering the lifting trolley 5.

[0088] With this configuration, by forming a continuous core 12a on the widthwise cutting line L2 along the transport direction Y1, the thickness of the upper deck slab 12 on the widthwise cutting line L2 can be reduced. Therefore, when the lifting trolley 5 is lowered, the upper deck slab removal method can cause the thinned portion on the widthwise cutting line L2 to break due to the weight of the upper deck slab 12.

[0089] Furthermore, by cutting the widthwise cutting line L2 by fracturing the continuous core 12a, the upper deck removal method can widen the gap between the cut upper deck 12 and the remaining portion (side wall 11) in the extension direction X compared to when the widthwise cutting line L2 is cut with a wire saw 6a.

[0090] Therefore, when transporting the separated upper deck slab 12 to a designated location P, the upper deck slab removal method can prevent the transport of the separated upper deck slab 12 in the transport direction Y1 from being hindered, for example, by contact between opposing cut surfaces in the extension direction X.

[0091] As a result, even when the upper deck removal method involves hollowing out a portion of the upper deck 12 and transporting it to a designated location P, the separated upper deck 12 can be transported smoothly, allowing for more efficient removal of the upper deck 12 installed near the railway tracks 2.

[0092] Furthermore, the cutting process involves cutting the upper deck slab 12 while the protective body 7 is covered with a protective sheet 8. With this configuration, for example, the protective sheet 8 can prevent fragments of the upper deck 12 or fragments of the broken wire saw 6a from scattering through the gap between the protective body 7 and the upper deck 12. Therefore, the upper deck removal method can reliably reduce the amount of work required to remove scattered fragments and reliably ensure the safety of the workers.

[0093] Furthermore, the removal process involves moving the lifting trolley 5, which supports the separated upper floor slab 12, to a designated location P using a chill wheel 9 operated by worker M. This configuration eliminates the need for power devices and other equipment to move the lifting trolley 5 to a predetermined location P. Therefore, the upper deck removal method can reduce the space required for installing the device that moves the lifting trolley 5, and can also reduce the cost required to remove the upper deck 12.

[0094] Furthermore, by moving the upper deck 12 to a designated location P separated from the tracks 2, the upper deck removal method allows the upper deck 12 to be loaded onto a vehicle and transported away after the track closure is lifted, thus reducing the amount of work that can be performed within the limited working time while the tracks are closed.

[0095] As a result, the upper deck removal method not only allows for the more efficient removal of the upper deck 12 installed near the railway tracks 2 within a limited working time, but also reduces the burden on the workers M who are working within that limited time.

[0096] Furthermore, with the upper deck 12 positioned below the track 2, the cutting process involves cutting the upper deck 12 with a wire saw 6a covered by a protective body 7 along an extension cutting line L1 that does not intersect the track 2.

[0097] With this configuration, the wire saw 6a and protective body 7 do not intersect the track 2 extending in the extension direction X, thereby preventing damage to the track 2 due to contact with the wire saw 6a and protective body 7, and also facilitating the installation of the wire saw 6a and protective body 7.

[0098] In the correspondence between the structure of this invention and the embodiments described above, The track of this invention corresponds to the track 2 of the embodiment, The same applies to the following: The temporary receiving process corresponds to step S101, The cutting line, the cutting line along the extension direction, and the cutting line along the intersecting direction that intersects the discharge direction correspond to the extension direction cutting line L1. The cutting process corresponds to step S106, The removal process corresponds to step S107, The continuous core formation process corresponds to step S103, The intersecting direction that crosses the extension direction corresponds to the width direction Y, The intersecting direction that crosses the discharge direction corresponds to the extension direction X. The cutting lines along the intersecting direction that cross the extension direction, and the cutting lines along the discharge direction, correspond to the widthwise cutting line L2, This invention is not limited to the configuration of the embodiments described above, and many other embodiments can be obtained.

[0099] For example, in the embodiment described above, the railway track 2 is described as passing above the underpass 1, but it is not limited to this, and the railway track 2 may be laid on the upper surface of the underpass 1. In this case, in the temporary support step S101, the railway track 2 is supported using appropriate support members in addition to the removal block B of the upper deck slab 12.

[0100] Furthermore, although the upper floor slab 12 was divided and cut into three removal blocks B, the number of removal blocks B is not limited to this, and may be an appropriate number depending on the size of the upper floor slab 12. Alternatively, instead of setting up multiple removal blocks B, the upper floor slab 12 may be removed in a single cutting process.

[0101] Furthermore, while the removal block B of the upper deck 12 was defined as the portion enclosed by the extension direction cutting line L1 along the extension direction X of the track 2 and the width direction cutting line L2 along the width direction Y of the track 2, the removal block may also be defined as the portion enclosed by the cutting line along the direction intersecting the extension direction X in a plan view. Furthermore, the positions of the extension direction cutting line L1 and the width direction cutting line L2 are not limited to the embodiments described above, but may be at any appropriate position.

[0102] Furthermore, although the protective body 7 is made of channel steel, it is not limited to this, and angle steel, H-beams, or open-section steel materials such as lip channel steel may also be used. Alternatively, the protective body may be made of long members that have sufficient strength to withstand the fragments of the upper deck 12 scattered during cutting or the broken wire saw 6a.

[0103] Furthermore, although the protective body 7 is described as having a length in the extension direction X from one side wall 11 to the other side wall 11, it is not limited to this, and multiple protective bodies of a predetermined length may be placed side by side from one side wall 11 to the other side wall 11.

[0104] Furthermore, in the continuous core formation step S103, a continuous core 12a was formed on the widthwise cutting line L2, but the process is not limited to this, and a continuous core may also be formed on the stretching direction cutting line L1 in addition to the widthwise cutting line L2. In this case, the continuous core on the extension cutting line L1 is formed by drilling a hole in the lower surface of the upper floor slab 12 to a predetermined depth that does not penetrate the upper floor slab 12, similar to the continuous core 12a on the width cutting line L2.

[0105] With this configuration, in the cutting process, the remaining portion of the continuous core only needs to be cut with a wire saw 6a, thus reducing the man-hours required for the cutting process compared to when a continuous core is not formed. Therefore, the upper deck removal method can remove the upper deck 12 installed near the railway tracks 2 more efficiently.

[0106] Furthermore, although a continuous core 12a was formed by excavation holes of a predetermined depth that do not penetrate the upper deck 12, the method is not limited to this, and a continuous core may also be composed of excavation holes drilled to a predetermined depth that do not penetrate the upper deck 12 and through holes that penetrate the upper deck 12.

[0107] Furthermore, although the widthwise cutting line L2 was cut by the continuous core 12a and the weight of the removed block B, the method is not limited to this, and the widthwise cutting line L2 may also be cut with a wire saw 6a, similar to the extension cutting line L1.

[0108] Furthermore, the remaining portion of the continuous core 12a along the widthwise cutting line L2 was fractured by the weight of the removal block B, but this is not limited to this. For example, before lowering the lifting trolley 5, a portion of the remaining portion of the continuous core 12a may be thinned or cut with a concrete cutter or concrete breaker, and then the remaining portion of the continuous core 12a may be fractured by the weight of the removal block B by lowering the lifting trolley 5.

[0109] Alternatively, before lowering the lifting trolley 5, the remaining portion of the continuous core 12a may be thinned using a concrete cutter or concrete breaker, and then the lifting trolley 5 may be lowered so that the remaining portion of the continuous core 12a is broken by the weight of the removal block B. Alternatively, before lowering the lifting trolley 5, the entire remaining portion of the continuous core 12a may be cut with a concrete cutter or concrete breaker, and then completely separated by lowering the lifting trolley 5.

[0110] Furthermore, before lowering the lifting platform 5, heavy objects such as heavy machinery may be placed on the removal block B, and then the lifting platform 5 may be lowered so that the remaining portion of the continuous core 12a is fractured by the combined weight of the removal block B and the heavy objects. Furthermore, although the separated removal block B was moved to a designated location P during the removal process, the method is not limited to this; the separated removal block B may also be divided and cut and then transported away without being moved.

[0111] Furthermore, although the removal blocks B were removed sequentially from one side in the width direction Y, the order in which the removal blocks B are removed is not limited to this, and any order in which they are removed may be used. For example, as shown in Figure 13, which illustrates the moving process in another embodiment, the second removal block B counting from one end in the width direction Y may be removed first.

[0112] In this case, as shown in Figure 14, which illustrates the movement process in another embodiment, the removal block B is lowered using the lifting trolley 5 until the upper end of the removal block B is below the lower end of the upper floor slab 12. Then, the removal block B, separated from the upper floor slab 12, is moved to a predetermined location P using a chill wheel.

[0113] Furthermore, the flow of the upper deck removal method shown in Figure 4 is just one example and is not limited to this; an appropriate flow may be used depending on the available working hours. Furthermore, as an example, the temporary receiving process in step S101, the continuous core formation process in step S102, the moving process in step S108, and the unloading process in step S109 are performed during daytime or nighttime hours, while the cutting device installation process in step S104, the protection process in step S105, and the cutting process in step S106 are performed during the time when the railway line is closed. However, this is not limited to this, and these processes may be performed at any appropriate time. [Explanation of symbols]

[0114] 2...Railway 5… Lifting platform 6a... Wire saw 7...Protective body 8… Protective film 9... Chill Wheel 12…Upper floor version 12a...Continuous core L1…Cutting line in the extension direction L2...Width-direction cutting line P…Specified place X…Stretching direction Y...Width direction Y1…Export direction

Claims

1. This is a method for removing upper deck slabs installed near the track, which involves cutting and removing them with an endless wire saw. A temporary support step in which the upper floor slab to be removed is supported from below by a lifting trolley, The wire saw, covered with a protective body having an open cross-section shape extending along the desired cutting line of the upper deck, performs a cutting step of cutting the upper deck along the cutting line, The removal process involves removing the separated upper deck slab. Top slab removal method.

2. The protective body is made of channel steel. The method for removing the upper deck slab according to claim 1.

3. After the temporary support step, a continuous core forming step is performed in which a hole is drilled into the lower surface of the upper floor slab to a predetermined depth that does not penetrate the upper floor slab, thereby forming a continuous core on the cutting line. The method for removing the upper deck slab according to claim 1.

4. After the temporary support step, a continuous core forming step is performed in which a hole is drilled into the lower surface of the upper deck to a predetermined depth that does not penetrate the upper deck, and a continuous core is formed on the cutting line along the intersecting direction that intersects the extension direction of the track. The aforementioned cutting process is, The process involves cutting the cutting line along the extension direction with the wire saw, and cutting the cutting line along the intersecting direction by lowering the lifting platform. The method for removing the upper deck slab according to claim 1.

5. In the aforementioned removal process, the separated upper floor slab is transported out along the transport direction toward a predetermined location. After the temporary support step, a continuous core formation step is performed in which a hole is drilled into the lower surface of the upper floor slab to a predetermined depth that does not penetrate the upper floor slab, and a continuous core is formed on the cutting line along the removal direction. The aforementioned cutting process is, The process involves cutting the cutting line along the intersecting direction that intersects the discharge direction with the wire saw, and cutting the cutting line along the discharge direction by lowering the lifting trolley. The method for removing the upper deck slab according to claim 1.

6. The aforementioned cutting process is, This is a step of cutting the upper floor slab while the protective body is covered with a protective sheet. The method for removing the upper deck slab according to claim 1.

7. The aforementioned removal process is as follows: This process involves moving the lifting trolley, which supports the separated upper floor slab, to a predetermined location using a till wheel operated by a worker. The method for removing the upper deck slab according to claim 1.

8. The upper deck is configured to be positioned below the track, The aforementioned cutting process is, The process involves cutting the upper deck slab with the wire saw, which is covered with the protective body, along the cutting line that does not intersect the aforementioned track. A method for removing an upper deck slab according to any one of claims 1 to 7.

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