Telescopic guide member for shoring, telescopic device for shoring, telescopic shoring, telescopic method for telescopic device for shoring, and telescopic method for shoring

Abstract

To provide an expansion / contraction guide member for a shoring, an expansion / contraction device for the shoring, an expansion / contraction shoring, a method of expansion / contraction of the expansion / contraction device for the shoring, and an expansion / contraction method of the shoring, which can be easily applied to vents of various shapes, can use a general-purpose jack, and can be constituted at a low cost.SOLUTION: An expansion / contraction guide member 12 for shoring is provided with a jack 30 capable of being extended / contracted in a fixed direction and is constituted so as to be extended / contracted in the fixed direction by the extension / contraction of the attached jack 30; the extension / contraction guide member 12 for shoring has a main body part 12A, which can extend / contract in the fixed direction, having a mounting part for mounting a jack 30; and a lock mechanism 16, which is provided in the main body part 12A and can switch between a restriction for preventing the main body part 12A from contracted below a predetermined length in the fixed direction and the release of the restriction, and the locking mechanism 16 allows repositioning of the load in the direction of contraction of the jack 30 between the jack 30 and the main body part 12A.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a telescopic guide member for shoring, an expansion device for shoring, an expansion shoring, a method for expanding and contracting an expansion device for shoring, and a method for expanding and contracting a shoring. [Background technology]

[0002] In one typical bridge erection method, the bridge girder block to be erected is lifted by a crane and temporarily supported by steel sandals stacked in multiple layers on a bent (temporary support equipment), and after adjusting the installation height of the bridge girder to match the design value, adjacent bridge girder blocks are connected in the bridge axis direction, and the length of the bridge girder to be erected is made longer than the distance between adjacent piers in the bridge axis direction. After that, the steel sandals are removed to release the temporary supports, and the bridge girder is placed on the pier to be erected, and the bent (temporary support equipment) is removed. Between the underside of the bridge girder to be erected and the top of the bent, multiple layers of steel sandles (sometimes multiple steel plates are stacked on top of the steel sandles to fine-tune the height) and low-stroke jacks are placed side by side, and when the bridge girder is lowered to adjust the installation height, the load is transferred between the steel sandles that support the load of the bridge girder to be erected from below and the jacks, and after the steel sandles and steel plates are removed so that the bridge girder is at the specified installation height, the bridge girder is lowered and the installation height of the bridge girder is adjusted.When the bridge girder is raised to adjust the installation height, the load is similarly transferred between the steel sandles that support the load of the bridge girder to be erected from below and the jacks, and after the bridge girder is raised with the jacks so that it is at the specified height, steel sandles and steel plates are added, and the load is transferred from the jacks to the steel sandles to adjust the installation height.

[0003] In this bridge girder installation height adjustment work, workers had to remove or add the steel sandles one layer at a time while shifting the load between the steel sandles and the jacks, which made the work inefficient, and because the distance between the bottom of the bridge girder to be erected and the top of the bent was short, it was difficult for workers to remove or add the steel sandles.In addition, because the distance between the bottom of the bridge girder and the top of the bent after the bridge girder was placed on the pier to be erected was short, it was also difficult to dismantle the bent after the bridge girder was placed on the pier to be erected.

[0004] A heavy-duty lifting device 300 described in Patent Document 1 is a technology that is thought to be able to deal with this problem. Fig. 29 is an external perspective view of the heavy-duty lifting device 300 described in Patent Document 1. This heavy-duty lifting device 300 is configured by connecting a lower frame 303 forming an installation surface and an upper frame 302 on which a heavy weight can be placed by a hollow telescopic guide post 304 provided in the center and a plurality of lifting cylinders 305, 306, 307, 308 arranged around the lower frame 303. The telescopic guide post 304 has a plurality of cylinders 304A, 304B, 304C slidably stacked so as to be able to support a horizontal load, and the lifting cylinders 306, 308 are provided with a locking mechanism that receives the load of the heavy weight and prevents it from falling in the event of an abnormality. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] JP 2007-320690 A Summary of the Invention [Problem to be solved by the invention]

[0006] However, the locking mechanism disclosed in the heavy load lifting device 300 described in Patent Document 1 is used in the auxiliary lifting cylinders 306, 308 that are used instead of the main lifting cylinders (main driving hydraulic cylinders) 305, 307 arranged around the telescopic guide post 304 when an abnormality such as oil leakage occurs in the main lifting cylinders (main driving hydraulic cylinders) 305, 307. The heavy load lifting device 300 described in Patent Document 1 is configured so that even if damage or the like occurs in the hydraulic circuits of the main driving hydraulic cylinders 305, 307, the locking mechanisms provided in the hydraulic cylinders 306, 308 mechanically receive the load to prevent them from falling, and drive the hydraulic cylinders 306, 308 to lift and lower them safely and reliably, and does not assume that the hydraulic cylinders 306, 308 themselves will not be subjected to a heavy load.

[0007] In addition, the telescopic guide post 304 is configured by stacking multiple cylindrical bodies 304A, 304B, 304C so that they can slide and support horizontal loads, but is unable to support vertical loads. In the heavy-duty lifting device 300 described in Patent Document 1, the lifting cylinders 305, 306, 307, 308 are responsible for receiving vertical loads, while the telescopic guide post 304 counters horizontal forces.

[0008] In other words, these cylinders (the telescopic guide post 304, and the lifting cylinders 305, 306, 307, and 308) have different roles and are integrally configured in the heavy load lifting device 300 described in Patent Document 1.

[0009] For this reason, the lifting cylinders 305, 306, 307, and 308 are specialized for use with the telescopic guide post 304, the upper frame 302, and the lower frame 303, and are not versatile, so that the sites where they can be applied are thought to be limited.

[0010] The present invention has been made in consideration of the above points, and an object of the present invention is to provide an expansion and contraction guide member for shoring, an expansion device for shoring, an expansion shoring work, an expansion method for an expansion device for shoring, and an expansion and contraction method for shoring, which can be easily applied to bents of various shapes, can be constructed at low cost so that general-purpose jacks can be used. [Means for solving the problem]

[0011] The present invention is an invention that solves the above-mentioned problems, and provides the following telescopic guide member for shoring, telescopic device for shoring, telescopic shoring, telescopic method for telescopic device for shoring, and telescopic method for shoring.

[0012] In other words, one aspect of the telescopic guide member for shoring according to the present invention is a telescopic guide member for shoring that has a jack that can be expanded and contracted in a fixed direction attached to it and is configured to be telescopic in the fixed direction by the expansion and contraction of the attached jack, wherein the telescopic guide member for shoring has a main body portion that can be expanded and contracted in the fixed direction and has an attachment portion for attaching the jack, and a locking mechanism that is provided on the main body portion and can switch between a restriction that prevents the main body portion from contracting below a predetermined length in the fixed direction and the release of the restriction, and the locking mechanism makes it possible to transfer the load in the contraction direction of the jack between the jack and the main body portion.

[0013] Here, "attaching the jack" means bringing the jack into a state in which at least a compressive force can be transmitted between the jack and an object to which the jack is attached. Similar descriptions in other parts of this application shall be interpreted in the same manner.

[0014] In addition, "attaching the jack" includes not only the case where the jack and the object to which the jack is attached are in direct contact with each other so that at least a compressive force can be transmitted, but also the case where another member is interposed between the jack and the object to which the jack is attached so that at least a compressive force can be transmitted. Similar descriptions in other parts of this application shall be interpreted in the same manner.

[0015] The mounting portion of the main body may be configured so that the mounted jack can be removed after the locking mechanism transfers the load in the contraction direction of the jack from the jack to the main body.

[0016] The main body may be configured to have three or more guide pillars with the fixed direction as its longitudinal direction, and to have the mounting portion in a jack arrangement area surrounded by the three or more guide pillars when viewed from the fixed direction.

[0017] Here, the jack arrangement area refers to the area inside a polygon formed by connecting the centers of the three or more guide pillars with straight lines when viewed from the certain direction.

[0018] The guide posts may be solid.

[0019] The jack may be configured to have a one-end fixing portion that connects and fixes one ends of the three or more guide pillars together, and one end of the jack that is attached to the mounting portion may be connected to the one-end fixing portion.

[0020] Here, "one end of the jack" being "connected to the one end fixing portion" means that the one end of the jack is in a state in which at least a compressive force can be transmitted between the one end of the jack and the one end fixing portion. Similar descriptions in other parts of this application shall be interpreted in the same manner.

[0021] In addition, "one end of the jack" being "connected to the one end fixing part" includes not only the case where one end of the jack is directly connected to the one end fixing part, but also the case where one end of the jack is indirectly connected via another member. Similar descriptions in other parts of this application shall be interpreted in the same manner.

[0022] The one end fixing portion may be provided with a columnar top end portion protruding in the direction in which the jack attached to the mounting portion extends, and the columnar top end portion may be configured so as to be connectable to another member located in the direction in which the jack extends.

[0023] The one end of the jack attached to the jack placement area may be configured to be connected to a portion of the one end fixing portion that extends the columnar top end in the direction in which the jack attached to the mounting portion contracts.

[0024] The shoring expansion and contraction guide member may be configured to have a base portion to which one end of the jack attached to the mounting portion is attached.

[0025] Here, the "base portion to which one end of the jack is attached" includes not only the case where one end of the jack is directly attached to the base portion, but also the case where one end of the jack is indirectly attached to the base portion via another member. Similar descriptions in other parts of this application shall be interpreted in the same manner.

[0026] The base portion may be configured to have through holes at positions corresponding to the three or more guide posts, and the three or more guide posts may be configured to pass through the corresponding through holes.

[0027] The three or more guide pillars may have a cutout portion that is cut out to reduce the cross section, and the locking mechanism may be configured so that a stopper member inserted into the cutout portion engages with the base portion, thereby restricting the contraction of the main body portion.

[0028] Here, in the three or more guide pillars, the "cross section" refers to a cross section obtained when the guide pillar is cut along a plane perpendicular to the longitudinal direction of the guide pillar.

[0029] Each of the three or more guide pillars may have a threaded portion on its outer circumferential surface and a nut that screws into the threaded portion, and the locking mechanism may be configured so that the nut engages with the base portion to limit contraction of the main body portion.

[0030] The one end of the jack attached to the mounting portion may be configured to be connected to the one end fixing portion by a clevis joint.

[0031] The mounting portion may be configured to be composed of an abutment portion that abuts both one end and the other end of the jack, and the restriction by the locking mechanism and the contraction action of the jack may separate one end of the jack from the abutment portion of the main body portion, thereby transferring the load in the contraction direction of the jack to the main body portion, thereby making it possible to remove the jack.

[0032] One aspect of the shoring expansion device according to the present invention is a shoring expansion device characterized by having a shoring expansion guide member and the jack attached to the mounting portion of the main body.

[0033] One aspect of the expansion shoring according to the present invention is an expansion shoring characterized in that it comprises a plurality of the shoring expansion devices, which are shifted horizontally so that the expansion and contraction direction is the vertical direction.

[0034] The plurality of shoring expansion devices may be linked to each other by displacement control.

[0035] The plurality of shoring expansion joints may be arranged in the same horizontal plane.

[0036] A connecting member may be further provided to horizontally connect adjacent shoring expansion units within the same horizontal plane.

[0037] The connecting member may be a lattice member.

[0038] The object to be supported may be the superstructure of a bridge, in which case the support expansion devices may be arranged in a row in a direction perpendicular to the bridge axis of the bridge, and may also be arranged in a row in the direction of the bridge axis of the bridge.

[0039] In the expansion and contraction support, a plurality of the expansion devices for the support may be stacked vertically and arranged in a plurality of tiers.

[0040] A first aspect of the method for expanding and contracting a shoring expansion device according to the present invention is a method for expanding and contracting a shoring expansion device, comprising: a load transfer process of extending the jack by a predetermined length and transferring the load that was applied to the locking mechanism to the jack in a state in which the contraction of the shoring expansion guide member is limited by the locking mechanism and the shoring expansion guide member supports a load via the locking mechanism; an unlocking process of releasing the lock of the shoring expansion guide member by the locking mechanism after the load is transferred in the load transfer process, and releasing the restriction on the contraction of the shoring expansion guide member; and a contraction process of contracting the jack after the locking process.

[0041] A second aspect of the method for expanding and contracting a shoring expansion device according to the present invention is a method for expanding and contracting a shoring expansion device, comprising: a jack extension step of extending the jack by a predetermined length in a state in which the shoring expansion device supports a load via the jack; a locking step of locking the jack with the locking mechanism of the shoring expansion guide member after extending the jack by the predetermined length in the jack extension step, thereby limiting the contraction of the shoring expansion guide member; and a load transfer step of contracting the jack by the predetermined length after the locking step, and transferring the load that was applied to the jack to the locking mechanism.

[0042] In a second aspect of the method for expanding and contracting the shoring expansion device, in the load transfer process, after the load applied to the jack is transferred to the locking mechanism, the jack may be removed from the shoring expansion device.

[0043] A first aspect of the method for expanding and contracting a shoring work according to the present invention is a method for expanding and contracting a shoring work using the expansion and contraction work, comprising: a load transfer process in which, in a state in which the contraction of the plurality of shoring expansion guide members is limited by the respective locking mechanisms and the plurality of shoring expansion guide members support a load via the respective locking mechanisms, the plurality of jacks are extended by a predetermined length in conjunction with each other through displacement control, and the load that was applied to each of the locking mechanisms is transferred to the plurality of jacks; an unlocking process in which, after the load is transferred in the load transfer process, the lock of the plurality of shoring expansion guide members by the respective locking mechanisms is released, and the contraction limit of the plurality of shoring expansion guide members is released in the locking release process, and the shoring contraction process in which, after the contraction limit of the plurality of shoring expansion guide members is released in the locking release process, the plurality of jacks are contracted in conjunction with each other through displacement control, thereby lowering the height of the expansion and contraction work.

[0044] A second aspect of the shoring expansion and contraction method according to the present invention is a method for expanding and contracting a shoring using the expansion and contraction shoring, comprising: a jack extension step of extending the multiple jacks in conjunction with each other by a predetermined length under displacement control while the multiple shoring expansion devices support a load via the multiple jacks; a locking step of locking the multiple jacks with the multiple locking mechanisms of the multiple shoring expansion guide members after the multiple jacks have been extended in conjunction with each other by the predetermined length under displacement control in the jack extension step, thereby restricting contraction of the multiple shoring expansion guide members; and a load transfer step of contracting the multiple jacks in conjunction with each other by displacement control by a predetermined distance after restricting contraction of the multiple shoring expansion guide members in the locking step, thereby transferring the load that was applied to the multiple jacks to the multiple locking mechanisms.

[0045] In a second aspect of the shoring expansion and contraction method, after the load is transferred from the plurality of jacks to the plurality of locking mechanisms in the load transfer process, the jacks may be removed from the shoring expansion device. Effect of the Invention

[0046] According to the present invention, it is possible to provide an expansion and contraction guide member for shoring, an expansion device for shoring, an expansion shoring work, an expansion method for an expansion device for shoring, and an expansion and contraction method for shoring, which can be easily applied to bents of various shapes, can be constructed at low cost using a general-purpose jack, and can be used. [Brief description of the drawings]

[0047] [Figure 1] A front view of the shoring expansion device 10 according to the first embodiment of the present invention in an extended state. [Diagram 2] FIG. 1 is a side view of the shoring expansion device 10 according to the first embodiment of the present invention in an extended state (a side view seen from the direction of the arrow II in FIGS. 1 and 6). [Diagram 3] Cross-sectional view of line III-III in Figure 1 [Figure 4] Cross-sectional view of line IV-IV in Figure 1 [Diagram 5] Plan view from the direction of arrow V in Figure 1 [Figure 6] Cross section of line VI-VI in Figure 1 [Figure 7] Cross-sectional view of line VII-VII in Figure 1 [Figure 8] FIG. 1 is a front view of a shoring expansion device 10 in a contracted state according to a first embodiment of the present invention; [Figure 9] Cross-sectional view of line IX-IX in Figure 8 [Figure 10] FIG. 1 is an enlarged front view showing an upper portion of a shoring expansion device 10 according to a first embodiment of the present invention; [Figure 11] FIG. 1 is an enlarged front view showing a lower part of a shoring expansion device 10 in an extended state according to a first embodiment of the present invention. [Figure 12] FIG. 1 is an enlarged front view showing a lower part of a shoring expansion device 10 in a contracted state according to a first embodiment of the present invention. [Figure 13] 13A is a front view of the guide pillar 14, and FIG. 13B is an enlarged side view of the cutout portion 14X as viewed in the direction of the arrow B in FIG. 13A. [Figure 14]FIG. 1 is an enlarged front view showing a part of the base portion 20 of the shoring expansion device 10 according to the first embodiment of the present invention and a pressing plate 36A thereon. [Figure 15] 14 is an enlarged side view showing a part of the base portion 20 of the shoring expansion device 10 according to the first embodiment of the present invention and a pressing plate 36A thereon (an enlarged side view seen from the direction of the arrow XV in FIG. 14). [Figure 16] FIG. 1 is an enlarged front view showing a guide pillar 14, a locking mechanism 16, and a portion of a base portion 20 of a shoring extension device 10 according to a first embodiment of the present invention; [Figure 17] 1A is a front view of the insertion plate 36, (B) is a side view of the insertion plate 36, and (C) is a side view of the bolt 38. FIG. [Figure 18] A front view (as seen from the bridge axis direction) showing an expanded state of an expansion support 40 using multiple expansion devices 10 for support (bent) as part of a support (bent) for erecting a superstructure 102 of a bridge 100. [Figure 19] A front view (as seen from the bridge axis direction) showing a contracted state of an expansion support 40 using multiple expansion devices 10 for support (bent) as part of a support (bent) for erecting a superstructure 102 of a bridge 100. [Figure 20] A front view showing the expansion device 10 for the expansion support 40 [Figure 21] A front view of the shoring expansion device 50 according to the second embodiment of the present invention in an extended state. [Figure 22] Sectional view of line XXII-XXII in Figure 21 [Figure 23] A front view of the shoring expansion joint 50 in a contracted state according to the second embodiment of the present invention. [Figure 24] FIG. 11 is an enlarged front view showing the lower part of the shoring expansion device 50 in the extended state according to the second embodiment of the present invention. [Diagram 25] 6 (a horizontal cross-sectional view of a section corresponding to FIG. 6 (a cross-sectional view of line VI-VI in FIG. 1) and FIG. 22 (a cross-sectional view of line XXII-XXII in FIG. 21)) [Figure 26]FIG. 11 is a front view showing a state in which the shoring expansion device 70 according to the modified example of the first embodiment is extended. [Figure 27] FIG. 11 is a front view showing a contracted state of the shoring expansion device 70 according to the modified example of the first embodiment. [Figure 28] FIG. 11 is a front view showing a contracted state of the shoring telescopic guide member 72 of the shoring telescopic device 70 according to the modified example of the first embodiment. [Figure 29] FIG. 1 is an external perspective view showing a heavy-duty lifting device 300 described in Patent Document 1. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0048] Hereinafter, an embodiment of the present invention will be described in detail with reference to the drawings. In the description of the embodiment of the present invention, a case will be described in which the shoring expansion device according to the embodiment of the present invention expands and contracts in the vertical direction, but the expansion direction of the shoring expansion device according to the present invention is not limited to the vertical direction. In addition, in Figs. 18 and 19, a steel box girder bridge 100 is taken up as an application target of the embodiment of the present invention, but the application target of the present invention is not limited to steel box girder bridges, and the present invention can also be applied to, for example, plate girder bridges, and can also be applied to concrete bridges as well as steel bridges. Furthermore, the present invention can be applied to fields other than bridges, and the application target of the present invention is not limited to bridges.

[0049] (1) First embodiment (1-1) Configuration Fig. 1 is a front view of the shoring extension device 10 according to the first embodiment of the present invention in an extended state, and Fig. 2 is a side view (a side view seen from the direction of arrow II in Fig. 1 and Fig. 6) of the shoring extension device 10 according to the first embodiment of the present invention in an extended state. However, in Fig. 1, within the range of the base part 20, the guide pillar 14 is depicted without depicting the parts of the members located in front of the guide pillar 14.

[0050] Fig. 3 is a cross-sectional view taken along line III-III in Fig. 1, Fig. 4 is a cross-sectional view taken along line IV-IV in Fig. 1, Fig. 5 is a plan view taken from the direction of arrow V in Fig. 1, Fig. 6 is a cross-sectional view taken along line VI-VI in Fig. 1, Fig. 7 is a cross-sectional view taken along line VII-VII in Fig. 1, Fig. 8 is a front view of the shoring extension device 10 according to the first embodiment of the present invention in a contracted state, Fig. 9 is a cross-sectional view taken along line IX-IX in Fig. 8, Fig. 10 is an enlarged front view of the upper part of the shoring extension device 10 according to the first embodiment of the present invention in an enlarged state, Fig. 11 is an enlarged front view of the lower part of the shoring extension device 10 according to the first embodiment of the present invention in an extended state, and Fig. 12 is an enlarged front view of the lower part of the shoring extension device 10 according to the first embodiment of the present invention in a contracted state. However, in Figs. 8, 11, and 12, the guide pillar 14 is depicted without depicting the parts of the members located in front of the guide pillar 14 within the range of the base portion 20.

[0051] 13 to 17 are detailed views of the various portions and parts related to the locking mechanism 16 of the shoring expansion device 10 according to the first embodiment of the present invention.

[0052] The shoring expansion device 10 according to the first embodiment of the present invention comprises a shoring expansion guide member 12 and a jack 30, and is configured to expand and contract in the same direction as the jack 30 in conjunction with the expansion and contraction of the jack 30.

[0053] The shoring telescopic guide member 12 includes four guide posts 14, a locking mechanism 16, an upper fixing portion 18, and a base portion 20. The four guide posts 14, the upper fixing portion 18, and the base portion 20 form a main body portion 12A of the shoring telescopic guide member 12.

[0054] A jack 30 can be attached to the main body 12A of the shoring telescopic guide member 12 via clevis joints 32, 34, and the main body 12A of the shoring telescopic guide member 12 telescopically expands and contracts in the same direction as the attached jack 30 telescopically expands and contracts (this telescopic mechanism will be described later). Furthermore, in the shoring telescopic guide member 12, a locking mechanism 16 is provided on the main body 12A to limit the contraction of the main body 12A and to support a load applied to the main body 12A in the direction of contraction of the main body 12A without using the jack 30. Therefore, the shoring telescopic guide member 12 can support a vertical load with the main body 12A by locking the main body 12A with the locking mechanism 16 to limit the contraction of the main body 12A, and the jack 30 can be removed from the shoring telescopic guide member 12 even when a load is applied to the main body 12A in the direction of contraction of the main body 12A. In addition, a jack that is attached together with the main body 12A of the shoring telescopic guide member 12 to constantly share and bear the load in the direction in which the main body 12A contracts cannot be removed from the shoring telescopic guide member 12 when a load is applied to the main body 12A in the direction in which the main body 12A contracts.

[0055] As shown in FIG. 3 and other figures, the four guide columns 14 are arranged at positions corresponding to the vertices of a square when viewed from above, so that the jack 30 can be arranged inside the square. As shown in FIG. 1 and other figures, the upper ends of the four guide columns 14 are fixed to the upper fixing part 18, and as shown in FIG. 13(A), the lower ends of the four guide columns 14 are attached to the lower end plate 14A by bolts 14A2. The four guide columns 14 connected in this manner are inserted through the base pipes 20C of the base part 20 arranged at the corresponding positions (see FIG. 1, FIG. 7, FIG. 8, etc.). The four guide columns 14 move relative to the base part 20 while passing through the base pipes 20C of the base part 20 in conjunction with the extension and contraction of the jack 30, so that the relative distance between the upper fixing part 18 and the base part 20 is extended and contracted, and the entire shoring extension device 10 is extended and contracted in the vertical direction. As shown in Figure 9, a lower end plate through hole 14A1 with an inner diameter larger than the outer diameter of the base end pipe 24A is provided in the center of the lower end plate 14A, and when the entire support expansion device 10 expands and contracts in the vertical direction, the lower end plate 14A moves in the vertical direction with the base end pipe 24A inserted through the lower end plate through hole 14A1.

[0056] The four guide pillars 14 of the shoring expansion device 10 according to the first embodiment are solid round steel bars, which are designed to increase the vertical load bearing capacity. The outer diameter of the guide pillars 14, which are solid round steel bars, may be appropriately determined according to the magnitude of the vertical load borne by each guide pillar 14, and when bearing the load of the steel superstructure of a bridge, the outer diameter is typically set to about 80 to 200 mm. Depending on the magnitude of the vertical load borne by each guide pillar 14, it is also possible to use steel pipes instead of solid round steel bars.

[0057] The length of the guide pillar 14 is typically about 2000 to 3000 mm when the extension amount is about 500 mm, and it is typically designed so that the guide pillar 14 moves relatively 400 to 600 mm with respect to the base portion 20 as the jack 30 extends or retracts.

[0058] 1 etc., the upper fixed part 18 has two steel flanges (upper fixed part upper flange 18A and upper fixed part lower flange 18B) at the top and bottom at a predetermined interval (for example, an interval of about 150 to 250 mm), and four guide pillars 14 are welded to the underside of the upper fixed part upper flanges 18A. In addition, the four guide pillars 14 penetrate the upper fixed part lower flange 18B, and the upper fixed part lower flange 18B is welded to the outer circumferential surface of the four guide pillars 14. As shown in Figures 3 and 4, the upper fixed part upper flange 18A and the upper fixed part lower flange 18B are substantially square in shape, but as shown in Figure 1 etc., the upper fixed part upper flange 18A is slightly larger than the upper fixed part lower flange 18B, and specifically, for example, when the outer diameter of the guide pillar 14 is about 100 mm, the shape of the upper fixed part upper flange 18A is substantially square with a side length of about 700 to 750 mm, and the shape of the upper fixed part lower flange 18B is substantially square with a side length of about 630 to 680 mm. The thickness of the upper fixed part upper flange 18A and the upper fixed part lower flange 18B is typically about 20 to 30 mm.

[0059] Ribs 18C are welded to the outer peripheral surfaces of the four guide posts 14 (portions located at the upper fixed portion 18), the upper surface of the upper fixed portion lower flange 18B, and the lower surface of the upper fixed portion upper flange 18A so as to form approximately a square when viewed in the longitudinal direction of the guide posts 14, as shown in Figures 3 and 10.

[0060] In addition, a top end tube 22A is disposed in the vertical direction in the center of the upper fixing part 18. The lower end of the top end tube 22A is welded to the upper surface of the upper fixing part lower flange 18B, and the top end tube 22A penetrates the center of the upper fixing part upper flange 18A and protrudes upward from the upper fixing part upper flange 18A of the upper fixing part 18. The upper fixing part upper flange 18A is welded to the outer peripheral surface near the center in the height direction of the top end tube 22A. The outer diameter of the top end tube 22A is typically about 200 to 500 mm, the thickness of the top end tube 22A is typically about 6 to 15 mm, and the top end tube 22A typically protrudes upward from the upper surface of the upper fixing part upper flange 18A by about 150 to 250 mm.

[0061] 3 and 4, ribs 18D are erected along the diagonals of the approximately square formed by the four guide columns 14 when viewed from the longitudinal direction of the guide columns 14, and the ribs 18D are welded to the upper surface of the upper fixing part lower flange 18B and the lower surface of the upper fixing part upper flange 18A, as well as to the outer circumferential surface of the guide columns 14 in the upper fixing part 18 and the outer circumferential surface of the top end tube body 22A in the upper fixing part 18. Furthermore, in the upper fixing part 18, ribs 18E are erected along the diagonals of the approximately square inside the top end tube body 22A, and the ribs 18E intersect each other at the center of the cross section of the top end tube body 22A. The ribs 18E may be attached to the inner circumferential surface of the top end tube body 22A in the upper fixing part 18 by welding.

[0062] As described above, the upper ends of the four guide posts 14 are firmly fixed by the upper fixing part 18. Moreover, the upper fixing part 18 that fixes the upper ends of the four guide posts 14 connects and fixes one ends of the four guide posts 14 together, and can be called a one-end fixing part.

[0063] As shown in Figure 1 etc., the upper fixed part 18 has a columnar top end 22 that protrudes upward, and the columnar top end 22 is connectable to other components located above, and the upper end of the jack 30 that connects to the underside of the upper fixed part lower flange 18B of the upper fixed part 18 is located below the columnar top end 22.

[0064] The columnar top end 22 includes a top end tube 22A and a top end plate 22B, and is a portion that protrudes above the upper fixing portion 18 and is a portion for connecting with other members located above. As shown in Figs. 4, 5, 10, etc., ribs 22C are welded to the outer peripheral surface of the top end tube 22A, the lower surface of the top end plate 22B, and the upper surface of the upper fixing portion upper flange 18A, and are erected at a position where they overlap with the rib 18D of the upper fixing portion 18 when viewed from above, as shown in Fig. 4. As described above, the lower portion of the top end tube 22A is included in the upper fixing portion 18, and the top end tube 22A is a member that belongs to both the columnar top end 22 and the upper fixing portion 18.

[0065] The base part 20 is provided with through holes so that the four guide pillars 14 can be inserted and moved freely in the vertical direction, and is configured so that the lower end of the jack 30 can be attached to the base part upper flange 20A, and is also a portion where the insertion plate 36 of the locking mechanism 16 that limits the movement of the four guide pillars 14 in the downward direction (the direction in which the shoring extension device 10 contracts) is engaged. In the shoring extension device 10 according to the first embodiment, the four guide pillars 14 move relative to the base part 20 while inserting them through the base part tube body 20C of the base part 20 in conjunction with the extension and contraction of the jack 30, so that the relative distance between the upper fixing part 18 and the base part 20 expands and contracts, and the entire shoring extension device 10 expands and contracts in the vertical direction, but the insertion plate 36 of the locking mechanism 16 engages with the base part 20 to limit the movement of the four guide pillars 14 in the downward direction (the direction in which the shoring extension device 10 contracts). As a result, the vertical downward load applied to the four guide pillars 14 is transmitted from the four guide pillars 14 via the insertion plates 36 of the locking mechanism 16 to the base portion 20, then to the column-shaped base end portion 24, and further to the ground 200 (see Figure 18) via other components below that are connected to the column-shaped base end portion 24.

[0066] The base portion 20 comprises a base portion upper flange 20A, a base portion lower flange 20B, and a base portion tube 20C, and the base portion upper flange 20A and the base portion lower flange 20B are arranged vertically at an interval (e.g., about 150 to 250 mm) equivalent to the height of the base portion tube 20C. The base portion tube 20C is open at the top and bottom, and the thickness of the tube wall of the base portion tube 20C is, for example, about 4 to 5 mm. The base portion tube 20C is provided with four guide posts 14 at positions corresponding to the four guide posts 14, the same number as the four guide posts 14. The base portion upper flange 20A has four through holes 20A1 (see Figs. 11, 12 and 14) at positions corresponding to the four guide posts 14, and the base portion lower flange 20B has four through holes 20B1 (see Figs. 11, 12 and 14) at positions corresponding to the four guide posts 14. The inner diameters of these through holes 20A1, 20B1 are slightly larger (e.g., about 2 to 4 mm larger) than the outer diameter of the guide posts 14, and the base portion tube 20C has an inner diameter slightly larger (e.g., about 4 to 5 mm larger) than the inner diameters of these through holes 20A1, 20B1. The upper end of the base pipe 20C is welded to the lower surface of the base upper flange 20A, and the lower end of the base pipe 20C is welded to the upper surface of the base lower flange 20B so that the through holes 20A1 and 20B1 are continuous with the inner hollow of the base pipe 20C. Therefore, the guide pillars 14 can penetrate the base 20 by inserting them through the through holes 20A1 of the base upper flange 20A, the inner hollow of the base pipe 20C, and the through holes 20B1 of the base lower flange 20B. The four guide pillars 14 move relative to the base 20 while passing through the inner hollow and the through holes 20A1 and 20B1 of the base pipe 20C of the base 20 in conjunction with the extension and contraction of the jack 30, so that the relative distance between the upper fixing part 18 and the base 20 is extended and contracted, and the entire support extension device 10 is extended and contracted in the vertical direction.

[0067] As shown in Figures 7, 11 and 12, ribs 20D are welded to the outer peripheral surface of the base pipe 20C, the upper surface of the base lower flange 20B, and the lower surface of the base upper flange 20A so as to form an approximately square shape when viewed from above.

[0068] In addition, a base end tube 24A is disposed in the center of the base portion 20 in the vertical direction. The upper end of the base end tube 24A is welded to the lower surface of the base portion upper flange 20A, and the base end tube 24A penetrates the center of the base portion lower flange 20B and protrudes downward from the base portion lower flange 20B of the base portion 20. The base portion lower flange 20B is welded to the outer circumferential surface of the base end tube 24A. The outer diameter of the base end tube 24A is typically about 200 to 500 mm, and the thickness of the tube wall of the base end tube 24A is typically about 6 to 15 mm. The length of the base end tube 24A is determined according to the amount of expansion and contraction. For example, when the amount of expansion and contraction is 500 mm, it is standard to protrude about 500 to 700 mm downward from the lower surface of the base portion lower flange 20B.

[0069] 7, ribs 20E are erected along the diagonals of a substantially square formed by the four base tubes 20C when viewed from above, and the ribs 20E are welded to the upper surface of the base lower flange 20B, the lower surface of the base upper flange 20A, the outer circumferential surface of the base tube 20C, and the outer circumferential surface of the base end tube 24A in the base portion 20. Furthermore, in the base portion 20, ribs 20F are erected along the diagonals of the substantially square inside the base end tube 24A, and the ribs 20F intersect with each other at the center of the cross section of the base end tube 24A. The ribs 20F may be attached to the inner circumferential surface of the base end tube 24A in the base portion 20 by welding.

[0070] As shown in Figure 1 etc., the base portion 20 is provided with a columnar base end 24 that protrudes downward, and the columnar base end 24 is connectable to other components located below, and the lower end of the jack 30 that connects to the upper surface of the base portion upper flange 20A of the base portion 20 is located above the columnar base end 24.

[0071] The columnar base end 24 includes a base end tube 24A and a base end plate 24B, and is a portion that protrudes downward from the base portion 20 and is a portion for connecting to another member located below. As described above, the upper portion of the base end tube 24A is included in the base portion 20, and the base end tube 24A is a member that belongs to both the columnar base end 24 and the base portion 20. The base end plate 24B (for example, a steel plate having a substantially square shape with a side length of about 400 to 500 mm and a thickness of about 10 to 15 mm) is attached to the lower end of the base end tube 24A, and a rib 24C is provided between the outer circumferential surface of the base end tube 24A and the upper surface of the base end plate 24B.

[0072] The jack 30 is disposed between the upper fixed part 18 and the base part 20, with one end connected to the upper fixed part 18 and the other end connected to the base part 20. As the jack 30 extends and retracts, the distance between the upper fixed part 18 and the base part 20 extends and retracts, and the entire support expansion device 10 extends and retracts.

[0073] Specifically, the upper end of the jack 30 is connected to the center of the lower surface of the upper fixing part lower flange 18B of the upper fixing part 18 via a clevis joint 32 (i.e., the part of the upper fixing part 18 where the columnar top end 22 is extended in the direction in which the shoring expansion device 10 contracts), and the lower end of the jack 30 is connected to the center of the upper surface of the base part upper flange 20A of the base part 20 via a clevis joint 34 (i.e., the part of the base part 20 where the columnar base end 24 is extended in the direction in which the shoring expansion device 10 expands). In conjunction with the extension and contraction of the jack 30, the four guide pillars 14 move relative to the base part 20 while passing through the inner space and the through holes 20A1 and 20B1 of the base part pipe body 20C of the base part 20, and the relative distance between the upper fixing part 18 and the base part 20 expands and contracts, and the entire shoring expansion device 10 expands and contracts in the vertical direction.

[0074] As shown in Figures 2 and 10, the clevis joint 32 is a joint formed by connecting three members, with an insertion plate-like body 32B disposed between two opposing plate-like bodies 32A, through a pin 32C, and the clevis joint 34 is a joint formed by connecting three members, with an insertion plate-like body 34B disposed between two opposing plate-like bodies 34A, through a pin 34C, as shown in Figures 2, 11, and 12. By removing the pin 32C of the clevis joint 32 and the pin 34C of the clevis joint 34, the jack 30 can be removed from the shoring expansion device 10. When the jack 30 is attached to the shoring expansion guide member 12 to form the shoring expansion device 10, the three components in a state in which the insertion plate body 32B is positioned between the two opposing plate bodies 32A are connected by a pin 32C, and the three components in a state in which the insertion plate body 34B is positioned between the two opposing plate bodies 34A are connected by a pin 34C.

[0075] The jack placement area in which the jack 30 is placed is a space surrounded by four guide pillars 14, and when installing it, it is only necessary to connect the upper end of the jack 30 to the upper fixed portion 18 with a clevis joint 32 and the lower end of the jack 30 to the base portion 20 with a clevis joint 34, so a general-purpose jack can be used.

[0076] As the jack 30, a hydraulic jack is typically used, but a mechanical jack may also be used.

[0077] The locking mechanism 16 is a locking mechanism that restricts the movement of the support telescopic guide member 12 in the contracting direction (the movement in the direction in which the four guide pillars 14 move downward and the height of the support telescopic guide member 12 decreases) so that the load attempting to contract the support telescopic guide member 12 can be supported and transmitted downward without using the jack 30.

[0078] Specifically, the lock mechanism 16 is a mechanism that includes the base portion 20, a notch portion 14X provided in the lower portion of the guide post 14, an insertion plate 36, a pressing plate 36A, a bolt 38, and a nut 38A, all of which are associated with one another.

[0079] In the lower part of the guide post 14 (for example, in a region about 200 to 400 mm from the lower end of the guide post 14 when the extension amount is about 500 mm), as shown in Fig. 12, cutout parts 14X are provided on both sides of the guide post 14 so that they are the same distance from the lower end and have the same rectangular shape when viewed from the side. The shape of the cutout parts 14X when viewed from the side is a long and narrow rectangle as shown in Figs. 12 and 13, and the shape when viewed from the side is, for example, about 20 to 30 mm in width and about 130 to 170 mm in height.

[0080] The insertion plate 36 is a steel plate that is inserted into the cutout portion 14X of the guide column 14. The thickness of the insertion plate 36 is the same as the width of the cutout portion 14X, and the height of the insertion plate 36 is about 20 mm smaller than the height of the cutout portion 14X. The length of the insertion plate 36 (depth length in Figs. 11 and 16) is set to, for example, about 160 to 200 mm or more so that the lower surface of the end portion (end portion in the depth direction in Figs. 11 and 16) of the insertion plate 36 can be sufficiently engaged with the upper surface of the base portion upper flange 20A when the insertion plate 36 is arranged upright in the cutout portion 14X so as to contact the upper surface of the base portion upper flange 20A. The underside of the end of the insertion plate 36 inserted into the cutout portion 14X engages with the upper surface of the base portion upper flange 20A, so that a lower end space 14X1 of the cutout portion 14X exists below the insertion plate 36 inserted into the cutout portion 14X, as shown in Figure 16.

[0081] As shown in Figures 11 and 16, by arranging the lower end of the guide pillar 14 in an upright position so that it is in contact with the upper surface of the base upper flange 20A of the base 20, the insertion plate 36 is sandwiched between the upper surface of the base upper flange 20A and the upper end surface of the cutout 14X, and even if the guide pillar 14 is moved downward, the insertion plate 36 restricts the movement. As a result, the vertical downward load applied to the four guide pillars 14 is transmitted to the base 20 via the insertion plate 36 of the locking mechanism 16, then to the column base ends 24, and further to the ground 200 (see Figure 18) via the lower member connected to the column base ends 24.

[0082] In the shoring expansion device 10 according to the first embodiment equipped with the lock mechanism 16, in order to hold the insertion plate 36 from the outside so as not to come off the cutout portion 14X, as shown in Figures 11, 12, 14 to 16, a holding plate 36A is welded and attached to the upper surface of the base upper flange 20A of the base portion 20. As shown in Figure 14, the holding plate 36A is arranged so as to circumscribe the through hole 20A1 of the base upper flange 20A, and the gap between the inner surface of the holding plate 36A (the surface on the guide pillar 14 side) and the outer surface of the insertion plate 36 inserted into the cutout portion 14X (the surface opposite to the guide pillar 14) is, for example, about 1 to 2 mm.

[0083] As shown in Fig. 13, a through hole 14X0 is provided so as to be perpendicular to the cut surface of the cutout portion 14X of the guide post 14. Also, as shown in Figs. 2 and 15, the pressing plate 36A is provided with a long hole 36A1 that is long in the vertical direction so as to be in a positional relationship continuous with the through hole 14X0. Furthermore, as shown in Fig. 17(A), the insertion plate 36 is provided with a long hole 36X that is long in the vertical direction and has the same shape as the long hole 36A1.

[0084] When inserting the insertion plate 36 into the cutout portion 14X, as shown in Fig. 16, the position of the long hole 36X of the insertion plate 36 is inserted so as to be continuous with the position of the long hole 36A1 of the pressing plate 36A and the through hole 14X0 of the cutout portion 14X. After inserting the insertion plate 36 into the cutout portions 14X on both sides of the guide column 14, the bolt 38 is inserted so as to pass through the long holes 36X of the two insertion plates 36, the long holes 36A1 of the two pressing plates 36A, and the through hole 14X0 of the cutout portion 14X, and the nut 38A is screwed. Since the pressing plate 36A is for preventing the insertion plate 36 from coming off the cutout portion 14X, it is not necessary to strongly screw in the nut 38A, and it is sufficient to lightly screw it in.

[0085] Since the through hole provided in the insertion plate 36 is a long hole 36X that is long in the vertical direction, and the through hole provided in the holding plate 36A is also a long hole 36A1 that is long in the vertical direction, even in the extended state of the shoring expansion device 10 (shoring expansion guide member 12) shown in Figures 1, 2 and 16 (a state in which the downward movement of the guide pillar 14 is restricted by the locking mechanism 16 and the locking mechanism 16 supports a downward load), the jack 30 attached to the shoring expansion guide member 12 can be slightly extended, and by slightly extending the jack 30, the load can be transferred from the locking mechanism 16 to the jack 30, and the downward load that was applied to the insertion plate 36 can be removed. The load is transferred from the locking mechanism 16 to the jack 30, and the downward load applied to the insertion plate 36 is released. Then, the bolt 38 is removed and the insertion plate 36 is pulled out from the cutout portion 14X, thereby releasing the lock provided by the locking mechanism 16 and allowing the guide pillar 14 to be moved downward and the support telescopic guide member 12 to be contracted.

[0086] The configuration of the shoring expansion device 10 according to the first embodiment of the present invention has been described above, but the steel materials used for the shoring expansion guide member 12 are all commonly used steel plates, steel pipes, and round steel bars, and as mentioned above, a general-purpose jack can also be used for the jack 30. Therefore, the shoring expansion device 10 according to the first embodiment can be constructed at low cost.

[0087] (1-2) Expansion method The method of expanding and contracting the shoring expansion device 10 according to the first embodiment of the present invention will be described separately for contraction and extension.

[0088] <When shrinking> When contracting the shoring expansion device 10 (shoring expansion guide member 12) from the extended state (a state in which the downward movement of the guide pillar 14 is restricted by the locking mechanism 16 and the locking mechanism 16 supports the downward load) shown in Figures 1, 2 and 16, the following procedure is performed.

[0089] (Step S1a (load changing process)) In the extended state of the shoring expansion device 10 (shoring expansion guide member 12) shown in Figures 1, 2 and 16, a downward load is applied to the insertion plate 36 from the guide pillar 14, so that the insertion plate 36 cannot be removed from the cutout portion 14X to release the lock by the locking mechanism 16.

[0090] Therefore, in this step S1a (load transfer process), a load transfer is performed to remove the load that has been applied downward from the guide pillar 14 to the insertion plate 36. Specifically, the load is transferred from the lock mechanism 16 to the jack 30 by slightly extending the jack 30, and the load that has been applied downward from the guide pillar 14 to the insertion plate 36 is removed. As described above, the through hole provided in the insertion plate 36 is the long hole 36X that is long in the vertical direction, and the through hole provided in the holding plate 36A is also the long hole 36A1 that is long in the vertical direction. Therefore, even when the shoring expansion device 10 (shoring expansion guide member 12) shown in Figures 1, 2 and 16 is in an extended state (a state in which the downward movement of the guide pillar 14 is restricted by the locking mechanism 16 and a downward load is supported via the locking mechanism 16), the jack 30 attached to the shoring expansion guide member 12 can be slightly extended, and by slightly extending the jack 30, the load can be transferred from the locking mechanism 16 to the jack 30, and the downward load that was applied to the insertion plate 36 can be released.

[0091] (Step S2a (unlocking process)) In step S1a (load transfer process), the downward load applied to the insertion plate 36 from the guide pillar 14 is removed, and then the nut 38A is removed from the bolt 38, and the bolt 38 inserted through the long holes 36A1, 36X and the through hole 14X0 is removed. Then, the insertion plate 36 is removed from the cutout portion 14X of the guide pillar 14, and the lock by the locking mechanism 16 is released. This allows the shoring telescopic guide member 12 to telescope in conjunction with the contraction of the jack 30.

[0092] (Step S3a (shrinkage process)) After the locking by the locking mechanism 16 is released in step S1a (load transfer process), the jack 30 is contracted to contract the support telescopic guide member 12.

[0093] <When extending> When extending the shoring expansion device 10 (shoring expansion guide member 12) from the contracted state (state in which it is not locked by the locking mechanism 16 and supports a downward load via the jack 30) shown in Figure 8, the procedure is as follows.

[0094] (Step S1b (Jack extension process)) In the contracted state of the shoring expansion device 10 (shoring expansion guide member 12) shown in Figure 8, it is not locked by the locking mechanism 16, so the jack 30 can be extended to extend the shoring expansion device 10 (shoring expansion guide member 12).

[0095] Therefore, in this step S1b (jack extension step), the jack 30 is extended by a predetermined length. To perform locking by the locking mechanism 16 in the next step S2b (locking step), specifically, the jack 30 is extended so as to raise the guide pillar 14 to a position where locking by the locking mechanism 16 can be performed (a position where the through hole 14X0 of the cutout portion 14X of the guide pillar 14 is horizontally continuous with the long hole 36A1 of the pressing plate 36A).

[0096] (Step S2b (locking process)) In step S1b (jack extension process), the guide pillar 14 is raised to a position where it can be locked by the locking mechanism 16 (a position where the through-hole 14X0 of the cutout portion 14X of the guide pillar 14 is horizontally continuous with the long hole 36A1 of the pressing plate 36A), and then the insertion plate 36 is inserted into the cutout portion 14X of the guide pillar 14. Then, the bolt 38 is inserted through the long holes 36A1, 36X and the through-hole 14X0, and the nut 38A is screwed onto the bolt 38. In this way, the locking mechanism 16 locks the guide pillar 14 to restrict its downward movement.

[0097] (Step S3b (load replacement process)) After setting the lock (which restricts the downward movement of the guide pillar 14) by the lock mechanism 16 in step S2b (locking process), the jack 30 is contracted and the load applied to the jack 30 is transferred to the lock mechanism 16. As a result, the load to contract the shoring telescopic guide member 12 is supported and transmitted downward via the guide pillar 14 and the lock mechanism 16, etc., without going through the jack 30. Therefore, after performing this step S3b (load transfer process), the load to contract the shoring telescopic guide member 12 is no longer transmitted to the jack 30, and it also becomes possible to remove the jack 30 from the shoring telescopic guide member 12.

[0098] (1-3) Application to bridges When the shoring expansion device 10 according to the first embodiment of the present invention is used for shoring (bent) during the erection of the superstructure 102 of a bridge 100, from the standpoint of load-bearing capacity, it is preferable to arrange multiple shoring expansion devices 10 in the direction perpendicular to the bridge axis and in the bridge axis direction to form the shoring (bent).

[0099] Fig. 18 is a front view (as viewed from the bridge axis direction) showing an expanded state of an expansion shoring 40 using a plurality of shoring expansion devices 10 as a part of a shoring (bent) for erecting a superstructure 102 of a bridge 100, and Fig. 19 is a front view (as viewed from the bridge axis direction) showing a contracted state of an expansion shoring 40 using a plurality of shoring expansion devices 10 as a part of a shoring (bent) for erecting a superstructure 102 of a bridge 100. Fig. 20 is a front view showing the shoring expansion device 10 used for the expansion shoring 40. A lattice joint opening 42 is provided in the shoring expansion device 10 used for the expansion shoring 40.

[0100] 18 and 19, in the expansion shoring 40, four first-stage shoring expansion devices 10 are arranged at intervals in the direction perpendicular to the bridge axis on a mounting 90, and the column-shaped base ends 24 (see FIG. 1, etc.) of the first-stage shoring expansion devices 10 are connected to the mounting 90. In addition, adjacent first-stage shoring expansion devices 10 in the direction perpendicular to the bridge axis are connected to each other by a lattice 44.

[0101] In addition, four second-stage shoring expansion devices 10 are arranged at intervals in the direction perpendicular to the bridge axis above the first-stage shoring expansion devices 10, and the columnar base end portions 24 (see Figure 1, etc.) of the second-stage shoring expansion devices 10 are connected to the columnar top end portions 22 (see Figure 1, etc.) of the first-stage shoring expansion devices 10. In addition, second-stage shoring expansion devices 10 adjacent to each other in the direction perpendicular to the bridge axis are connected by lattices 44.

[0102] In addition, four conventional-type supports 92 without telescopic function are arranged at intervals in the direction perpendicular to the bridge axis on top of the second-stage shoring expansion device 10, and the third-stage conventional-type support 92 is connected to the column-shaped top end 22 (see Figure 1, etc.) of the second-stage shoring expansion device 10. Adjacent third-stage conventional-type supports 92 in the direction perpendicular to the bridge axis are connected by a lattice 44.

[0103] In this way, the expansion support 40 is constructed by stacking supports in three tiers, but in the expansion support 40, the same three-tier configuration is set at a specified interval (for example, about 2 to 3 m) in the bridge axis direction, and the members arranged at the ends perpendicular to the bridge axis in each tier are connected in the bridge axis direction by lattices 44 (not shown), and furthermore, a top end frame 94 is provided at the top to constitute the expansion support 40. Therefore, the overall shape of the expansion support 40 is a rectangular parallelepiped.

[0104] The lattice 44 that connects the shoring expansion devices 10 together has its lower part connected to the lattice joint opening 42 (see FIG. 20) and its upper part connected to the upper flange 18A of the upper fixing part 18.

[0105] The number of support expansion devices 10 to be arranged perpendicular to the bridge axis and in the bridge axis direction, as well as the number of tiers in which the support expansion devices 10 are stacked upward, can be appropriately determined according to the conditions at the site to which they are to be applied, making the support expansion devices 10 easy to apply to bents of various shapes.

[0106] In addition, in the telescopic support 40 in the extended state shown in Fig. 18, each shoring expansion device 10 is locked by its own locking mechanism 16, and the telescopic support 40 supports the superstructure 102 of the bridge 100 from below without placing a load on the jack 30. Therefore, it is also possible to remove the jack 30 from the telescopic support 40 in the extended state shown in Fig. 18.

[0107] In the superstructure 102 supported by the expansion shoring 40 in the extended state shown in Fig. 18, when the girder blocks are connected to each other and preparations for lowering the superstructure 102 onto the pier are completed, each shoring expansion device 10 is contracted by the method described in "(1-2) Expansion method", and the superstructure 102 is lowered and placed on the pier. At that time, the jacks 30 of the first and second shoring expansion devices 10 are linked and expanded by displacement control for each stage. The order of the expansion work of the first stage and the expansion work of the second stage is not particularly limited, but it is better to perform the expansion work of the first stage and the expansion work of the second stage separately, rather than simultaneously.

[0108] After the first and second stages of telescopic operation have been completed and the telescopic support 40 has been contracted, as shown in Figure 19, a sufficient working space, the under-girder space 46, can be secured between the top frame 94 and the superstructure 102 of the bridge 100, and the subsequent removal of the telescopic support 40 can also be easily performed.

[0109] (2) Second embodiment Fig. 21 is a front view of the shoring extension unit 50 according to the second embodiment of the present invention in an expanded state, Fig. 22 is a cross-sectional view of line XXII-XXII in Fig. 21, Fig. 23 is a front view of the shoring extension unit 50 according to the second embodiment of the present invention in a contracted state, and Fig. 24 is an enlarged front view of the lower part of the shoring extension unit 50 according to the second embodiment of the present invention in an expanded state. However, in Figs. 21 and 23, the guide pillar 54 is depicted without depicting the parts of the members located in front of the guide pillar 54 within the range of the base part 20. Also, in Figs. 21 and 23, the lattice joint opening 42 is depicted on the shoring extension unit 50, but when the shoring extension units 50 are not connected to each other horizontally, it is not necessary to provide the lattice joint opening 42.

[0110] In the shoring telescopic device 10 according to the first embodiment, a locking mechanism 16 is provided in which the guide column 14 is provided with a cutout portion 14X, and the insertion plate 36 inserted into the cutout portion 14X is engaged with the base portion 20 to restrict the shoring telescopic device 10 (the shoring telescopic guide member 12) from contracting. However, in the shoring telescopic device 50 according to the second embodiment, a locking mechanism 56 (a locking mechanism in which a nut 58 screwed into the guide column 54 is engaged with the base portion 20 to restrict the downward movement of the guide column 54 and restrict the contraction of the shoring telescopic device 50) is provided, which is different from the locking mechanism 16 in the shoring telescopic device 10 according to the first embodiment. Except for the locking mechanism 56 and the configuration changed in relation thereto, the shoring telescopic device 50 according to the second embodiment is similar to the shoring telescopic device 10 according to the first embodiment, and therefore the same reference numerals are used for the same components as those of the shoring telescopic device 10 according to the first embodiment, and the description thereof is omitted in principle.

[0111] The shoring expansion and contraction device 50 according to the second embodiment of the present invention comprises a shoring expansion and contraction guide member 52 and a jack 30, and is configured to expand and contract in the same direction as the jack 30 in conjunction with the expansion and contraction of the jack 30.

[0112] The shoring telescopic guide member 52 includes four guide posts 54, a locking mechanism 56, an upper fixing portion 18, and a base portion 20. The four guide posts 54, the upper fixing portion 18, and the base portion 20 form a main body portion 52A of the shoring telescopic guide member 52.

[0113] The jack 30 can be attached to the main body 52A of the shoring telescopic guide member 52 via clevis joints 32, 34, and the main body 52A of the shoring telescopic guide member 52 expands and contracts in the same direction as the jack 30 expands and contracts with a mechanism similar to that of the main body 12A of the shoring telescopic guide member 12 in the first embodiment. Furthermore, in the shoring telescopic guide member 52, a locking mechanism 56 is provided in the main body 52A that limits the contraction of the main body 52A and enables the load applied to the main body 52A in the direction in which the main body 52A contracts to be supported without the jack 30. Therefore, by locking the main body 52A with the locking mechanism 56 to limit the contraction of the main body 52A, the main body 52A can support a vertical load, and even when a load is applied to the main body 52A in the direction in which the main body 52A contracts, the jack 30 can be removed from the shoring telescopic guide member 52. Note that a jack that is attached to always share and bear the load in the direction in which the main body 52A contracts together with the main body 52A of the shoring telescopic guide member 52 cannot be removed from the shoring telescopic guide member 52 when a load is applied to the main body 52A in the direction in which the main body 52A contracts.

[0114] 21 and 23, the four guide pillars 54 are each provided with a thread on the outer peripheral surface of a predetermined region of the lower part (for example, in the case where the expansion and contraction amount is about 500 mm, the outer peripheral surface in a range of about 200 to 1000 mm from the lower end of the guide pillar 54) by cutting a thread, and a nut 58 is screwed into this threaded portion 54X. The nut 58 screwed into the threaded portion 54X is engaged with the base portion 20, thereby restricting the downward movement of the guide pillar 54 and restricting the contraction of the shoring expansion device 50.

[0115] In the shoring extension device 10 according to the first embodiment, a locking mechanism 16 is used in which a cutout portion 14X is provided in the guide pillar 14 and an insertion plate 36 inserted into the cutout portion 14X engages with the base portion 20 to restrict the contraction of the shoring extension device 10 (shoring extension guide member 12). Therefore, in order to hold the insertion plate 36 from the outside so as not to come off the cutout portion 14X, a pressing plate 36A is welded and attached to the upper surface of the base portion upper flange 20A of the base portion 20, as shown in Figures 11, 12, and 14 to 16. However, in the locking mechanism 56 of the shoring extension device 50 according to the second embodiment of the present invention, a nut 58 screwed into the threaded portion 54X of the guide pillar 54 engages with the base portion 20. For this reason, the pressing plate 36A is not necessary in the shoring expansion device 50 according to the second embodiment, and the pressing plate 36A is not attached to the base part 20 of the shoring expansion device 50 according to the second embodiment. Meanwhile, since the nut 58 is used as an engaging stopper member in the shoring expansion device 50 according to the second embodiment, the washer 58A is attached to the upper surface of the base part upper flange 20A so that the through hole 20A1 of the base part upper flange 20A and the through hole of the washer 58A are continuous so that the nut 58 is engaged with the base part 20 via the washer 58A as shown in FIG.

[0116] As shown in Fig. 22, the four guide pillars 54 are arranged at positions corresponding to the vertices of a square when viewed from above, so that the jack 30 can be arranged inside the square. As shown in Fig. 21, the upper ends of the four guide pillars 54 are fixed to the upper fixing part 18, and as shown in Figs. 21 and 23, the lower ends of the four guide pillars 54 are attached to the lower end plate 14A. Although not shown, the lower ends of the four guide pillars 54 are attached to the lower end plate 14A by bolts 14A2, similar to the shoring extension device 10 of the first embodiment. The four guide pillars 54 connected in this manner are inserted through the base pipes 20C of the base 20 arranged at the corresponding positions (see Figs. 21 and 23). As the jack 30 extends and retracts, the four guide posts 54 move relative to the base portion 20 while passing through the base portion tube 20C of the base portion 20, thereby expanding and contracting the relative distance between the upper fixed portion 18 and the base portion 20, and the entire support expansion device 50 expands and contracts in the vertical direction.

[0117] The four guide columns 54 of the shoring extension device 50 according to the second embodiment are solid round steel like the four guide columns 14 of the shoring extension device 10 according to the first embodiment, and are designed to have a large vertical load bearing capacity. The outer diameter of the guide columns 54, which are solid round steel, may be appropriately determined according to the magnitude of the vertical load borne by each guide column 54, and when bearing the load of the steel superstructure of a bridge, the outer diameter is typically set to about 80 to 200 mm. Depending on the magnitude of the vertical load borne by each guide column 54, it is also possible to use steel pipes instead of solid round steel.

[0118] The length of the guide pillar 54 is typically about 2000 to 3000 mm when the extension amount is about 500 mm, and it is typically designed so that the guide pillar 54 moves relatively 400 to 600 mm with respect to the base portion 20 as the jack 30 extends or retracts.

[0119] The locking mechanism 56 is a locking mechanism that restricts the movement of the shoring telescopic guide member 52 in the contracting direction (the movement in the direction in which the four guide pillars 54 move downward and the height of the shoring telescopic guide member 52 decreases) to support and transmit downward the load attempting to contract the shoring telescopic guide member 52 without using the jack 30. The locking mechanism 56 is constituted by the base portion 20, a threaded portion 54X provided on the outer peripheral surface of the lower part of the guide pillar 54, a nut 58, and a washer 58A which are all related to each other. Specifically, the nut 58 screwed into the threaded portion 54X of the guide pillar 54 engages with the base portion 20 via the washer 58A, thereby restricting the movement of the support telescopic guide member 52 in the contracting direction (the movement in the direction in which the four guide pillars 54 move downward and the height of the support telescopic guide member 52 decreases), allowing the load attempting to contract the support telescopic guide member 52 to be supported and transmitted downward without using the jack 30.

[0120] In the lock mechanism 56, the position of the nut 58 screwed into the threaded portion 54X of the guide pillar 54 can be changed arbitrarily within the range of the threaded portion 54X, so that the position at which the nut 58 engages with the base portion 20 can be set arbitrarily within a range according to the threaded portion 54X. Therefore, for example, the screwed position of the nut 58 can be changed in conjunction with the rise and fall of the guide pillar 54, so that even if the hydraulic pressure of the jack 30 suddenly disappears, the amount of contraction of the shoring telescopic guide member 52 (the distance the guide pillar 54, upper fixed portion 18, and columnar top end portion 22 fall) can be kept small.

[0121] In addition, a plurality of shoring expansion devices 50 according to the second embodiment can be used to configure an expansion shoring similar to the expansion shoring 40 described in "(1-3) Application to bridges." In other words, the expansion shoring can be configured by replacing the shoring expansion device 10 with the shoring expansion device 50 in the expansion shoring 40.

[0122] (3) Third embodiment FIG. 25 is a horizontal cross-sectional view of the shoring expansion joint 60 according to the third embodiment of the present invention in an extended state (a horizontal cross-sectional view at a cutting position corresponding to FIG. 6 (cross-sectional view along line VI-VI in FIG. 1) and FIG. 22 (cross-sectional view along line XXII-XXII in FIG. 21)).

[0123] In the shoring telescopic device 10 according to the first embodiment, a cutout portion 14X is provided in the guide column 14, and an insertion plate 36 inserted into the cutout portion 14X is engaged with the base portion 20 to restrict the downward movement of the guide column 14, thereby restricting the contraction of the shoring telescopic device 10. In the shoring telescopic device 50 according to the second embodiment, a threaded portion 54X is provided in the guide column 54, and a nut 58 screwed into the threaded portion 54X is engaged with the base portion 20 to restrict the contraction of the guide column 54. In the third embodiment, the lock mechanism 56 is provided to restrict the downward movement of the shoring extension device 50 in the shoring extension device 50 and restrict the contraction of the shoring extension device 50, but in the shoring extension device 60 according to the third embodiment, the guide supports 14 of the shoring extension device 10 are used for two of the four guide supports, and the guide supports 54 of the shoring extension device 50 are used for the remaining two guide supports, and this is an embodiment in which both the lock mechanism 16 of the shoring extension device 10 and the lock mechanism 56 of the shoring extension device 50 are used as lock mechanisms. Other points are the same as those of the shoring extension device 10 according to the first embodiment and the shoring extension device 50 according to the second embodiment, and therefore a description thereof will be omitted in principle.

[0124] The shoring expansion and contraction device 60 according to the third embodiment of the present invention comprises a shoring expansion and contraction guide member 62 and a jack 30, and is configured to expand and contract in the same direction as the jack 30 in conjunction with the expansion and contraction of the jack 30.

[0125] The shoring telescopic guide member 62 includes four guide posts (two guide posts 14 and two guide posts 54), a locking mechanism 66, an upper fixing portion 18, and a base portion 20. The four guide posts (two guide posts 14 and two guide posts 54), the upper fixing portion 18, and the base portion 20 form a main body portion 62A of the shoring telescopic guide member 62. As shown in Fig. 25, when viewed from above, the two guide posts 14 are disposed at positions that form one diagonal of a substantially square, and the two guide posts 54 are disposed at a position that form the other diagonal of the substantially square.

[0126] The jack 30 can be attached to the main body 62A of the shoring telescopic guide member 62 via clevis joints 32, 34, and the main body 62A of the shoring telescopic guide member 62 expands and contracts in the same direction as the jack 30 expands and contracts with a mechanism similar to that of the main body 12A of the shoring telescopic guide member 12 in the first embodiment. Furthermore, in the shoring telescopic guide member 62, a locking mechanism 66 is provided in the main body 62A that limits the contraction of the main body 62A and enables the load applied to the main body 62A in the direction in which the main body 62A contracts to be supported without the jack 30. Therefore, by locking the main body 62A with the locking mechanism 66 to limit the contraction of the main body 62A, the main body 62A can support a vertical load, and even when a load is applied to the main body 62A in the direction in which the main body 62A contracts, the jack 30 can be removed from the shoring telescopic guide member 62. Note that a jack that is attached to always share and bear the load in the direction in which the main body 62A contracts together with the main body 62A of the shoring telescopic guide member 62 cannot be removed from the shoring telescopic guide member 62 when a load is applied to the main body 62A in the direction in which the main body 62A contracts.

[0127] The locking mechanism 66 of the shoring expansion device 60 according to the third embodiment is a locking mechanism constituted by combining the locking mechanism 16 for the two guide pillars 14 and the locking mechanism 56 for the two guide pillars 54.

[0128] When a horizontal force is applied to the shoring extension device 50 according to the second embodiment, as shown in Fig. 23, in the base portion 20, the edge surface of the base portion upper flange 20A comes into contact with the threaded portion 54X of the guide pillar 54 and resists the horizontal force, so there is a risk that the threads of the threaded portion 54X will be crushed. The shoring extension device 60 according to the third embodiment includes two guide pillars 14 that are not threaded on their outer circumferential surfaces and two guide pillars 54 that are equipped with threaded portions 54X, so that the horizontal force can be resisted mainly by the two guide pillars 14 that are not threaded on their outer circumferential surfaces, and crushing of the threads of the threaded portion 54X of the guide pillar 54 can be suppressed.

[0129] Furthermore, the shoring expansion and contraction device 60 of this third embodiment is provided with two guide pillars 54 each having a threaded portion 54X and a nut 58 that screws into the threaded portion 54X. Therefore, the screwing position of the nut 58 can be changed in these two guide pillars 54 in conjunction with the ascent and descent of the guide pillars 54. Therefore, even in the event that the hydraulic pressure of the jack 30 is suddenly lost, the amount by which the shoring expansion and contraction guide member 62 (the distance by which the guide pillars 14, 54, upper fixed portion 18 and columnar top end 22 fall) can be kept small.

[0130] Moreover, a plurality of shoring expansion devices 60 according to the third embodiment can be used to configure an expansion shoring similar to the expansion shoring 40 described in "(1-3) Application to bridges". In other words, an expansion shoring can be configured by replacing the shoring expansion device 10 with the shoring expansion device 60 in the expansion shoring 40.

[0131] (4) Supplementary information The number of guide pillars in the shoring expansion device 10, 50, 60 according to the first to third embodiments described above was four, but in the shoring expansion device according to the present invention, the number of guide pillars may be three, or may be five or more.

[0132] Furthermore, in the shoring extension devices according to the first to third embodiments, the cutout portions 14X and threaded portions 54X constituting the locking mechanisms 16, 56, 66 are formed only in one region of the guide pillars 14, 54, but this is not particularly limited, and similar cutout portions 14X and threaded portions 54X may be formed in multiple regions in the longitudinal direction of the guide pillars 14, 54, so that the locking mechanisms 16, 56, 66 can be operated at multiple points in the longitudinal direction of the guide pillars 14, 54.

[0133] In addition, in the support expansion devices 10, 50, and 60 according to the first to third embodiments, the jack 30 and the upper fixed portion lower flange 18B of the upper fixed portion 18 are connected by a clevis joint 32, and the jack 30 and the base portion upper flange 20A of the base portion 20 are connected by a clevis joint 34, but the connection manner between the upper fixed portion 18 and the base portion 20 and the jack is not limited to the connection manner using a clevis joint.

[0134] For example, the upper fixing portion 18 and the base portion 20 may be connected to the jack 30 by bolts or screws.

[0135] Also, instead of these connection modes, as in the shoring extension device 70 according to the modification of the first embodiment shown in Fig. 26 and Fig. 27, the upper end of the jack 74 may be abutted against the abutment portion 18B1 on the lower surface of the upper fixing portion lower flange 18B of the upper fixing portion 18, and the lower end of the jack 74 may be abutted against the abutment portion 20A2 on the upper surface of the base portion upper flange 20A of the base portion 20. Fig. 26 is a front view showing the extended state of the shoring extension device 70 according to the modification of the first embodiment, and Fig. 27 is a front view showing the contracted state of the shoring extension device 70 according to the modification of the first embodiment. Fig. 28 is a front view showing the contracted state of the shoring extension guide member 72 of the shoring extension device 70 according to the modification of the first embodiment.

[0136] That is, in the shoring telescopic device 70 according to the modified example of the first embodiment, the upper end of the jack 74 abuts against the abutment portion 18B1 on the lower surface of the upper fixing portion lower flange 18B of the upper fixing portion 18, applying an upward force to the upper fixing portion 18, and the lower end of the jack 74 abuts against the abutment portion 20A2 on the upper surface of the base portion upper flange 20A of the base portion 20, applying a downward force to the base portion 20. In addition, the upper fixing portion 18 is subjected to a downward load due to its own weight and the weight of the guide pillar 14 and the columnar top end portion 22, etc. Therefore, when the jack 74 is extended or retracted, the upper fixing portion 18 moves relative to the base portion 20 in conjunction with the extension or retraction of the shoring. As a result, the relative distance between the upper fixing portion 18 and the base portion 20 is extended or retracted, the shoring telescopic guide member 72 is extended or retracted in the vertical direction, and the entire shoring telescopic device 70 is extended or retracted in the vertical direction.

[0137] The same locking mechanism 16 as that of the shoring extension device 10 of the first embodiment described above limits the contraction of the main body 72A of the shoring extension guide member 72 (the configuration of the main body 72A is the same as that of the main body 12A of the shoring extension guide member 12 of the shoring extension device 10 of the first embodiment), making it possible to support the load applied to the main body 72A in the direction in which the main body 72A contracts without using the jack 74.By transferring the load in the contraction direction to the main body 72A and then further contracting the jack 74, the jack 74 can be removed as is, as shown in Figure 27 (before the jack 74 is removed) and Figure 28 (after the jack 74 is removed).

[0138] A configuration similar to that in the shoring expansion device 70 relating to the modified example of the first embodiment (a configuration in which the upper end of the jack 74 abuts against the abutment portion 18B1 on the underside of the upper fixed portion lower flange 18B of the upper fixed portion 18, applying an upward force to the upper fixed portion 18, and the lower end of the jack 74 abuts against the abutment portion 20A2 on the upper surface of the base portion upper flange 20A of the base portion 20, applying a downward force to the base portion 20) can also be applied to the shoring expansion device 50 relating to the second embodiment and the shoring expansion device 60 relating to the third embodiment, to form a modified example of the shoring expansion device 50 relating to the second embodiment and a modified example of the shoring expansion device 60 relating to the third embodiment. [Explanation of symbols]

[0139] 10, 50, 60, 70...Expansion device for shoring 12, 52, 62, 72...Stretchable guide members for shoring 12A, 52A, 62A, 72A...Main body 14, 54…Guide posts 14A…Lower end plate 14A1…Lower end plate through hole 14A2…Bolt 14X…Notch 14X0…Through hole 14X1: Space at the lower end of the cutout portion 14X 16, 56, 66…locking mechanism 18...Top fixing part 18A…Upper flange of upper fixing part 18B…Upper fixed part lower flange 18B1…Contact part 18C, 18D, 18E...Rib 20…Base section 20A…Base upper flange 20A1…Through hole 20A2…Abutting part 20B…Base lower flange 20B1…Through hole 20C…Base tube 20D, 20E, 20F...Ribs 22...Column top 22A…Top end tube body 22B…Top plate 22C…Rib 24...Columnar base end 24A…Base end tube 24B…Base plate 24C…Rib 30, 74…Jack 32, 34...Clevis fitting 32A, 34A...Facing plate-like bodies 32B, 34B...insertion plate-shaped body 32C, 34C…pin 36…Insertion plate 36A…Press plate 36A1, 36X…long hole 38…Bolt 38A…Nut 40...Extensible shoring 42...Lattice joint opening 44…Lattice 46…Space under the beam 54X…Threaded section 58...Nut 58A…Washer 90…Frame 92...Conventional type of support 94…Top mount 100…Bridge 102...Superstructure 200...ground 300…Heavy lifting equipment 302…Upper frame 303…Lower frame 304...Telescopic guide post 304A, 304B, 304C...Cylinder 305, 306, 307, 308...Lifting cylinders

Claims

1. A shoring telescopic guide member to which a jack capable of expanding and contracting in a certain direction is attached and configured to be telescopic in the certain direction by the expansion and contraction of the attached jack, The support telescopic guide member is A main body portion that is extendable in a certain direction and has an attachment portion for attaching the jack; a lock mechanism provided on the main body portion and capable of switching between restricting the main body portion from contracting to a predetermined length or less in the certain direction and releasing the restriction; having The main body portion has three or more solid guide pillars with the certain direction as a longitudinal direction, and the mounting portion is provided in a jack arrangement area surrounded by the three or more solid guide pillars when viewed from the certain direction, A telescopic guide member for shoring, characterized in that the locking mechanism enables the load in the contraction direction of the jack to be transferred between the jack and the main body.

2. The telescopic guide member for support as described in claim 1, characterized in that the mounting portion of the main body is configured so that the attached jack can be removed after the load in the contraction direction of the jack is transferred from the jack to the main body by the locking mechanism.

3. The telescopic guide member for shoring as described in claim 1 or 2, characterized in that it has a one-end fixing portion that connects and fixes one ends of the three or more guide pillars together, and one end of the jack attached to the mounting portion is connected to the one-end fixing portion.

4. The telescopic guide member for support as described in claim 3, characterized in that the one end fixing portion is provided with a columnar top end portion that protrudes in the direction in which the jack attached to the mounting portion extends, and the columnar top end portion is connectable to another member located in the extension direction of the jack.

5. The telescopic guide member for support as described in claim 4, characterized in that the one end of the jack attached to the jack arrangement area is connected to a portion of the one end fixing portion that extends the columnar top end in the direction in which the jack attached to the mounting portion contracts.

6. The telescopic guide member for support according to any one of claims 3 to 5, characterized in that it has a base portion to which one end of the jack attached to the mounting portion is attached.

7. The telescopic guide member for support as described in claim 6, characterized in that the base portion has through holes at positions corresponding to the three or more guide posts, and the three or more guide posts are inserted into the corresponding through holes.

8. The three or more guide posts are provided with cutout portions having a smaller cross-section, and the locking mechanism is configured so that a stopper member inserted into the cutout portion engages with the base portion, thereby restricting the contraction of the main body portion.

9. The three or more guide posts each have a threaded portion on its outer circumferential surface, and a nut that screws into the threaded portion, and the locking mechanism is configured so that the nut engages with the base portion, thereby restricting the contraction of the main body portion.

10. The telescopic guide member for shoring as described in any one of claims 3 to 9, characterized in that the one end of the jack attached to the mounting portion is connected to the one end fixing portion by a clevis joint.

11. The telescopic guide member for shoring described in any one of claims 1 to 9, characterized in that the mounting portion is composed of an abutment portion against which both one end side and the other end side of the jack abut, and the restriction by the locking mechanism and the contraction action of the jack separate the one end side of the jack from the abutment portion of the main body portion, thereby transferring the load in the contraction direction of the jack to the main body portion, thereby making it possible to remove the jack.

12. The telescopic guide member for shoring according to any one of claims 1 to 11, The jack attached to the mounting portion of the main body; A support expansion device comprising:

13. 13. An expansion shoring structure comprising a plurality of the shoring expansion devices according to claim 12, the expansion shoring devices being shifted horizontally so that the expansion and contraction directions are vertical.

14. The expansion and contraction support according to claim 13, characterized in that the plurality of expansion and contraction devices for the support are linked and contracted under displacement control.

15. The expansion and contraction support according to claim 13 or 14, characterized in that the plurality of expansion joints for shoring are arranged in the same horizontal plane.

16. The expansion and contraction support according to claim 15, further comprising connecting members for horizontally connecting adjacent ones of the shoring expansion assemblies in the same horizontal plane.

17. The expansion support according to claim 16, characterized in that the connecting members are lattice members.

18. The expansion support structure according to any one of claims 13 to 17, characterized in that the object to be supported is the superstructure of a bridge, and the support expansion devices are arranged in a row in a direction perpendicular to the bridge axis of the bridge, and also in a row in the bridge axis direction of the bridge.

19. The expansion and contraction support according to any one of claims 13 to 18, characterized in that a plurality of the expansion devices for the support are stacked vertically and arranged in a plurality of tiers.

20. A method for expanding and contracting the shoring expansion device according to claim 12, a load transfer process in which the jack is extended by a predetermined length in a state in which the contraction of the shoring telescopic guide member is restricted by the locking mechanism and the shoring telescopic guide member supports a load via the locking mechanism, and the load applied to the locking mechanism is transferred to the jack; an unlocking process of unlocking the lock of the shoring telescopic guide member by the locking mechanism after the load is transferred in the load transfer process, and releasing the restriction on the contraction of the shoring telescopic guide member; a contracting step of contracting the jack after the unlocking step; A method for expanding and contracting a shoring expansion device, comprising:

21. A method for expanding and contracting the shoring expansion device according to claim 12, a jack extension process for extending the jack by a predetermined length in a state in which the shoring expansion device supports a load via the jack; a locking step of extending the jack by the predetermined length in the jack extension step, and then locking the jack with the locking mechanism of the shoring telescopic guide member to limit the contraction of the shoring telescopic guide member; a load transfer process in which the jack is contracted by a predetermined length after the locking process, and the load applied to the jack is transferred to the locking mechanism; A method for expanding and contracting a shoring expansion device, comprising:

22. The method for expanding and contracting a shoring extension device according to claim 21, characterized in that, in the load transferring step, after the load applied to the jack is transferred to the locking mechanism, the jack is removed from the shoring extension device.

23. A method for expanding and contracting a support using the expansion and contraction support according to any one of claims 13 to 19, a load transfer process in which the plurality of shoring telescopic guide members are restricted in contraction by the respective locking mechanisms, and in a state in which the plurality of shoring telescopic guide members support a load via the respective locking mechanisms, the plurality of jacks are linked together by displacement control to be extended by a predetermined length, and the load applied to each of the locking mechanisms is transferred to the plurality of jacks; an unlocking process for unlocking the locking mechanisms of the plurality of shoring telescopic guide members after the load is transferred in the load transfer process, thereby releasing the restriction on the contraction of the plurality of shoring telescopic guide members; a support contraction process in which the lock release process releases the restriction on the contraction of the plurality of support telescopic guide members, and then the plurality of jacks are contracted in conjunction with each other by displacement control to lower the height of the telescopic support; A method for expanding and contracting a support structure, comprising the steps of:

24. A method for expanding and contracting a support using the expansion and contraction support according to any one of claims 13 to 19, A jack extension process in which the plurality of jacks are linked and extended by a predetermined length by displacement control in a state in which the plurality of shoring extension devices support a load via the plurality of jacks; In the jack extension step, the plurality of jacks are interlocked and extended by the predetermined length by displacement control, and then the plurality of shoring telescopic guide members are locked by the plurality of locking mechanisms to limit the contraction of the plurality of shoring telescopic guide members; a load transfer process in which, after restricting the contraction of the plurality of shoring telescopic guide members in the locking process, the plurality of jacks are contracted in conjunction with each other by a predetermined distance through displacement control, and the load applied to the plurality of jacks is transferred to the plurality of locking mechanisms; A method for expanding and contracting a support structure, comprising the steps of:

25. The method for expanding and contracting a shoring structure according to claim 24, characterized in that, after the loads are transferred from the plurality of jacks to the plurality of locking mechanisms in the load transferring step, the jacks are removed from the shoring expansion device.

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