Temporary pier construction method and temporary pier demolition method

Abstract

To provide a method for constructing and removing a temporary pier by a simple and safe step.SOLUTION: A temporary pier construction method and a temporary pier demolition method provided with a boarding facility mechanism 20 comprise: a frame structural body installation step of a new stage for placing a front support E2, a front bearing girder B2 and side front main girders A2a in an erection direction from an existing stage 1; a front space reinforcing connection step in which a rail body 28 of the boarding facility mechanism 20 is laid between the side front main girders A2a in the transverse direction, and a horizontal crosspiece b2 and a brace C2 which are connected in the transverse direction are connected; a side surface space reinforcing connection step in which the rail body 28 of the boarding facility mechanism 20 is laid to an existing bearing girder B1 and a forward bearing girder B2 in the longitudinal direction, and a vertical crosspiece a2 and a brace D2 to be connected in the longitudinal direction are connected; and a lining plate laying step in which a central front main girder A2b is arranged between the side front main girders A2a so as to overhang from the existing main girder A1, and a lining plate 3 is provided.SELECTED DRAWING: Figure 5

Description

Technical Field

[0001] The present invention relates to a construction method and a dismantling method of a temporary trestle installed for the construction of elevated roads and the like.

Background Art

[0002] Conventionally, a temporary trestle has been assembled as temporary equipment for constructing roads and the like in mountainous areas and sloping lands. In Patent Document 1, a construction method of the temporary trestle is disclosed by a gondola support device installed on a main girder. Further, in Patent Document 2, it is disclosed that by mounting a gondola unit equipped with an elevating gondola on second horizontal steel materials and elevating the gondola, each member is removed or cut.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Patent Document 2

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, the construction method disclosed in Patent Document 1 requires the dismantling and installation of the gondola support device for each stage, which is very laborious. The dismantling method disclosed in Patent Document 2 can mount the gondola unit only between horizontal girders (receiving girders) occupying a unit space, and after removing the horizontal girders, it was necessary to remove braces and the like by a scaffolding bridging process. Therefore, a construction method and a dismantling method that can use a single boarding equipment mechanism to bridge between main girders and receiving girders for both construction and dismantling have been desired. In addition, it uses a gondola support device installed at a high place, and it cannot always be said that it is highly simple and safe in use.

[0005] Therefore, the present invention aims to provide a construction method and a dismantling method for a temporary bridge that can be constructed and dismantled by spanning between main girders or receiving girders using a single boarding facility mechanism and can be carried out in a simple and safe process.

Means for Solving the Problems

[0006] The temporary bridge construction method according to the present invention is a temporary bridge construction method provided with a boarding facility mechanism including a rail body, a rail attachment member, and a gondola suspended from the rail body so as to be movable up and down and left and right. A framework structure body installation step of a new construction stage in which a plurality of leading struts arranged in the transverse direction are driven in the erection direction from an existing stage, a leading receiving girder connecting between the heads of the leading struts is installed, and a side leading main girder among the leading main girders extending from the existing main girder to the leading receiving girder is arranged; a front space reinforcement connection step of connecting a cross beam and braces that are connected in the transverse direction by spanning between the side leading main girders so that the rail body of the boarding facility mechanism is in the transverse direction; a side space reinforcement connection step of connecting a longitudinal beam and braces that are connected in the longitudinal direction by spanning between the existing receiving girder and the leading receiving girder so that the rail body of the boarding facility mechanism is in the longitudinal direction; and a sheathing board laying step of arranging a central leading main girder by projecting it from the existing main girder between the side leading main girders and providing a sheathing board on the side leading main girder and the central leading main girder.

[0007] Further, in the temporary bridge construction method, the boarding facility mechanism preferably has a plurality of gondolas and a rail body composed of an H-beam sandwiched by trolleys, and the gondola moves in the longitudinal direction of the rail body and is lifted and lowered by a winch, and has a rail attachment member for attaching the rail body to the framework structure body.

[0008] In addition, the temporary trestle demolition method of the present invention is a temporary trestle demolition method provided with a boarding equipment mechanism including a rail body, a rail attachment member, and a gondola suspended from the rail body so as to be movable up and down, and includes a sheathing board laid on the side leading main girder and the central leading main girder among the leading main girders extending from the existing main girder to the leading receiving girder at the tip, a sheathing board removal step of removing the central leading main girder, and a side space reinforcement demolition step of disassembling the vertical crossbars and braces connected in the longitudinal direction by spanning the existing receiving girder and the leading receiving girder so that the rail body of the boarding equipment mechanism is in the longitudinal direction, and a front space reinforcement demolition step of disassembling the horizontal crossbars and braces connected in the transverse direction by spanning between the side leading main girders so that the rail body of the boarding equipment mechanism is in the transverse direction, and a framework structure installation step of the new construction stage of disassembling the side leading main girder, disassembling the leading receiving girder connecting between the heads of a plurality of leading columns arranged in the transverse direction, and disassembling the leading columns.

[0009] In addition, in the temporary trestle demolition method, the boarding equipment mechanism has a plurality of gondolas and a rail body composed of H-shaped steel sandwiched by trolleys, and the gondola moves in the longitudinal direction of the rail body and moves up and down by a winch, and preferably has a rail attachment member for attaching the rail body to the framework structure.

Effects of the Invention

[0010] According to the temporary trestle construction method described in Claims 1 and 2, it is possible to construct vertical crossbars, horizontal crossbars, and braces by spanning between main girders and between receiving girders with a single boarding equipment mechanism, and it is possible to construct a temporary trestle by a simple method. Moreover, since the gondola can always be maintained inside the framework structure, the temporary trestle can be constructed in a safe process.

[0011] According to the temporary trestle demolition method described in Claims 3 and 4, it is possible to disassemble vertical crossbars, horizontal crossbars, and braces by spanning between main girders and between receiving girders with a single boarding equipment mechanism, and it is possible to construct a temporary trestle by a simple method. Moreover, since the gondola can always be maintained inside the framework structure, the temporary trestle can be disassembled in a safe process.

Brief Description of the Drawings

[0012]

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Embodiments for Carrying Out the Invention

[0013] An example of an embodiment of the present invention will be described with reference to FIGS. 1-10. In the present invention, a temporary trestle bridge for construction and dismantling refers to a bridge temporarily installed for constructing an elevated road or the like. The present invention constructs a future stage 2 newly installed from an existing stage 1 initially constructed by using a boarding equipment mechanism 20, and when dismantling, it dismantles from the future stage 2 located at the forefront. In this description, "forefront" refers to the portion constructed on the new erection side from the existing stage 1 in construction, and in dismantling, it refers to the portion where dismantling starts and is mainly located at the forefront side in the longitudinal direction (the erection side in the case of construction). Note that the longitudinal direction is the direction in which the falsework bridge is extended in the short side direction of the formwork 3 mounted on the existing stage 1 shown in FIG. 1, and the transverse direction is the direction in the longitudinal direction of the formwork 3 and the width of the falsework bridge itself.

[0014] The basic configuration of the existing stage 1 and the falsework bridge will be described with reference to FIG. 1. In FIG. 1, for the convenience of explanation, a state in which the formwork 3 and the stanchion 4 on the laborious side of the existing stage 1 are removed is shown.

[0015] The existing stage 1 includes a receiving girder B1 that transversely connects between the heads of a plurality of erected existing columns E1, an existing main girder A1 (a side existing main girder A1a and a central existing main girder A1b) spanning in the longitudinal direction, girder members (vertical crossbars a1 and horizontal crossbars b1) arranged substantially parallel to the main girder A1 and the receiving girder B1 below it, and braces C1, D1 (front space braces C1 and side space braces D1) spanning the outer longitudinal and transverse sections partitioned by these. The formwork 3 is mounted on the upper surface of the uppermost main girder A1 extending in the longitudinal direction of the existing stage 1. Further, stanchions 4 are joined around the uppermost surface of the existing stage 1.

[0016] The present invention constructs a future stage 2 projecting in the erection direction (longitudinal direction) from the existing stage 1 using a boarding equipment mechanism 20 described later, and constructs a falsework bridge by repeating this. The dismantling method is to dismantle from the future stage 2 and repeat this to dismantle the falsework bridge. Next, the construction method will be described.

[0017] [Steel Frame Structure Installation Process] Using FIGS. 2 and 3, the steel frame structure installation process for constructing the leading stage 2 from the existing stage 1 will be described. When constructing the leading stage 2 as the new stage in the erection direction (longitudinal direction) from the existing stage 1, each material is lifted by a crane. The guide pile 10 is driven into the ground with an electric vibratory hammer, the guide frame 11 is installed on the guide pile 10 exposed on the ground, and a hole is drilled for driving the leading column E2. The leading column 2 is driven into the drilled location, and the leading column E2 is driven into the bottom of the hole with an electric vibratory hammer. A plurality of leading columns E2 are driven in the transverse direction.

[0018] In this state, the bracket 12 is installed near the heads of the plurality of leading columns E2, the scaffold 13 is lifted and placed on the bracket 12, and the pile heads are cut at the indicated positions of the leading columns 2 to align the heights. The leading receiving girder B2 with a top plate and a handrail for connecting between the heads of the plurality of leading columns E2 is placed and installed. Then, the guide pile 10 and the guide frame 11 are removed.

[0019] Next, as shown in FIGS. 4(a) and 4(b), the side leading main girder A2a of the leading main girder A2 is lifted by a crane and joined to the upper sides of the leading columns E2 arranged on both sides in the transverse direction and the side main girder A1a of the existing main girder A1. However, in order to join the members, it is also possible to install the bracket 12 on the column 2 each time and place the boarding equipment 13 on the bracket 12 for construction, but the joining may also be performed using the boarding equipment mechanism 20 described later.

[0020] Among such main girders, the side-front main girder A2a refers to those located on both sides among a plurality of main girders arranged in the transverse direction, and those located inward other than the side-front main girder A2a are regarded as the center-front main girder A2b. In the present embodiment, in the framework structure installation process, the side space Y (see Fig. 4(a)) formed by the side-front main girder A2a protruding from the existing stage 1, the front support E2, and the existing support E1 in side view, and the space surrounded by the two side-front main girders A2a, A2a protruding from the existing stage 1, the front receiving girder B2, and the existing receiving girder B1 in plan view (see Fig. 4(b)), and the front space Z (see Fig. 6) surrounded by the front support E2 and the front receiving girder B2 in front view are formed. The framework structure in this description refers to the structure assembled by the front support E2, the front receiving girder B2, and the two side-front main girders A2a on the front stage 2.

[0021] [Front Space Reinforcement and Connection Process] As shown in Figs. 5(a) and (b), the boarding equipment mechanism 20 installed on the upper surface of the covering board 3 of the existing stage 1 is lifted by a crane, and both side ends of the rail body 28 are spanned over the side-front main girders A2a, A2a on both sides of the front stage, and the rail body 28 itself is fixed by rail mounting materials such as bullmen. For the spanning of the rail body 28, an installation platform may be attached so that the heights are aligned. Workers board the gondolas 21, 21 of the boarding equipment mechanism 20 to perform operations.

[0022] As shown in Figs. 6(a) and (b), in the front space reinforcement and connection process, cross beams b2, b2, which are a plurality of girder members, are spanned in the front space Z (see Fig. 4(c)) of the front stage 2 with an appropriate range left empty. The front space braces C2, C2 are spanned in an X shape in the space partitioned by the front receiving girder B2, the cross beams b2, the cross beams b2, and the cross beams b2. It becomes possible to join each brace by moving the gondola 21 vertically and horizontally.

[0023] [Side Space Reinforcement and Connection Process] As shown in FIGS. 5(a) and 5(c), the boarding equipment mechanism 20 installed on the upper surface of the formwork plate 3 of the existing stage 1 is lifted by a crane, and both side ends of the rail body 28 are spanned between the existing receiving girder B1 of the existing stage 1 and the forward receiving girder B2 of the forward stage 2, and the rail body 28 itself is fixed by a rail mounting member such as a bullhead. The bridging of the rail body 28 may be installed with an installation base so that the heights are aligned. Workers board the gondolas 21, 21 of the boarding equipment mechanism 20 and perform work.

[0024] As shown in FIG. 7, in the side space reinforcement connection process, in the side space Y (see FIG. 4(b)) of the forward stage 2, a plurality of longitudinal bars a2, a2, which are girder members, are spanned with an appropriate space. In the spaces partitioned by the side forward main girder A2a and the longitudinal bars a2, and between the longitudinal bars a2 and the longitudinal bars a2, the side space braces D2, D2 are spanned in an X shape. By moving the gondola 21 vertically and horizontally, it becomes possible to join each brace.

[0025] [Formwork Plate Laying Process] As shown in FIG. 8, after completing the side space reinforcement connection process and the front space reinforcement connection process, the central forward main girders A2b, A2b are spanned between the side forward main girders A2a, A2a on both sides. Formwork plates 3, 3 are laid on the upper surfaces of these forward main girders A2, and stands 4 are arranged on both sides, thereby completing the forward stage 2 (newly constructed stage). The constructed forward stage 2 becomes the existing stage 1, and by repeating the construction of the same forward stage 2, the temporary trestle is completed.

[0026] The disassembly method of the forward stage 2 will be described. The disassembly method is in the reverse order of the construction method of the forward stage 2 described above. In the disassembly method, the forward stage 2 refers to the stage located most forward during disassembly.

[0027] [Formwork Plate Removal Process] As shown in FIG. 6(c), on the completed forward stage 2, the formwork plates 3 and the stands 4 located on the upper surface are disassembled by workers manually or by lifting. Further, the central forward main girders A2b, A2b located between the side forward main girders A2a, A2a on both sides are removed.

[0028] [Side space reinforcement removal process] As shown in FIGS. 5(a) and 5(c), the boarding equipment mechanism 20 installed on the upper surface of the formwork 3 of the existing stage 1 is lifted by a crane, and both side ends of the rail body 28 are spanned between the existing receiving girders B1 of the existing stage 1 and the forward receiving girders B2 of the forward stage 2, and the rail body 28 itself is fixed by rail mounting materials such as bullmen. The bridging of the rail body 28 may be installed with an installation platform so that the heights are aligned. Workers board the gondolas 21, 21 of the boarding equipment mechanism 20 to perform operations.

[0029] In the side space reinforcement removal process, in the side space Y (see FIG. 4(a)) of the forward stage 2, a plurality of girder members, i.e., vertical bars a2, a2, are removed with an appropriate range left empty. The side space braces D2, D2 that are X-shapedly spanned in the space partitioned by the side forward main girder A2a and the vertical lines a2, the vertical lines a2 and the vertical bars a2 are also removed. These vertical bars a2 and side space braces D2 may be completely removed, or may simply be cut and then removed from the columns and girder members after disassembly. Each brace can be disassembled by moving the gondola 21 vertically and horizontally.

[0030] [Front space reinforcement disassembly process] The boarding equipment mechanism 20 installed on the upper surface of the formwork 3 of the existing stage 1 is lifted by a crane, and both side ends of the rail body 28 are spanned between the side forward main girders A2a, A2a on both sides of the forward stage 2, and the rail body 28 itself is fixed by rail mounting materials such as bullmen. The bridging of the rail body 28 may be installed with an installation platform so that the heights are aligned. Workers board the gondolas 21, 21 of the boarding equipment mechanism 20 to perform operations.

[0031] In the front space reinforcement and disassembly process, appropriate spaces are left in the front space Z (see Fig. 4(c)) of the leading stage 2, and the horizontal crossbars b2, b2, which are a plurality of girder members, are cut. In the spaces partitioned by the leading receiving girder B2 and the horizontal and vertical b2, and between the horizontal crossbars b2 and b2, the front space braces D2, D2 in an X shape are also cut. These horizontal lines b2 and braces D2 may be completely removed, or they may simply be cut and then removed from the columns and girder members after disassembly. By moving the gondola 21 vertically, horizontally, and in all directions, each brace can be disassembled.

[0032] [Frame structure disassembly process] As shown in Figs. 4(a) and 4(b), for the side leading main girder A2a among the leading main girders A2, the connection between the upper part of the leading columns E2 arranged on both sides in the transverse direction and the side existing main girder A1a among the existing main girders A1 is released, and it is hoisted and removed by a crane. The connection of the leading receiving girder B1 that connects between the heads of the plurality of leading columns E2 is also released and removed. With only the leading columns E2 remaining, the leading columns E2 are removed. As shown in Fig. 9, the remaining leading columns 2 are cut down by making a cut near the ground surface of the columns 2 while being supported by a crane near the pile head. By carrying out the cut-down columns 2 out, the existing stage 1 is disassembled. The most leading stage that has been disassembled becomes the new leading stage 2, and by repeating the disassembly of the same leading stage 2, the temporary trestle can be disassembled.

[0033] Next, the boarding equipment mechanism 20 used in the present invention will be described. As shown in FIGS. 10(a) and 10(b), two gondolas 21 are suspended and supported on a rail body 28 made of H-shaped steel. Inside the gondola 21, a boarding cage 22 moves up and down or down by a winch 23 provided on the ceiling of the boarding cage 22. The winch 23 is suspended and supported by a cage body 25 provided with a control panel 24 having a power source and is supplied with power from the control panel 24. An electric trolley 26 and a pantograph trolley 27 supplied with power from the control panel 24 are arranged at the upper part of the cage body 25, and the peripheral surfaces of the pulleys of the trolleys 26 and 27 are brought into contact with the flange of the rail body 28 made of H-shaped steel so as to sandwich it. The winch 23 and the trolleys 26 and 27 can be operated by an operation panel, and the boarding equipment 21 can be slid in the longitudinal direction of the rail body 28 made of H-shaped steel. That is, the boarding equipment 21 can be smoothly and stably suspended by the trolleys 26 and 27 which are supports.

[0034] According to the boarding equipment mechanism 20 used in the present invention, by directly attaching the rail body 28 to the main girder or the receiving girder with a fixture such as a bullman, a simple configuration can achieve safe work. That is, by spanning the rail body 28, the gondola 21 itself will be located inside the frame structure of the leading stage 2, and it is not suspended from above the leading stage 2 as in the prior art. Therefore, even when there is unexpected rain or wind, it is possible to suppress the sway of the gondola.

[0035] Also, according to the boarding equipment mechanism used in the present invention, the reinforcement of the side space and the reinforcement of the front space can be performed by a single mechanism, and the gondola 21 can be mounted and moved not only in the longitudinal direction described above but also in the transverse direction. Therefore, when constructing or disassembling the leading stage 2, it is also possible to move the gondola up, down, left, and right, and perform the work of attaching and disassembling braces and crossbars at both end positions with two gondolas.

Explanation of Reference Numerals

[0036] 1... Existing stage, 2... Leading stage, 3... Sheathing board, 4... Stand 10…Guide post, 11…Guide frame, 12…Bracket, 20…Ride equipment mechanism, 21…Gondola, 22…Ride cage, 23…Winch, 24…Control panel, 25…Cage body, 26…Electric trolley, 27…Plenum trolley, 28…Rail body, A…Main girder, A1…Existing main girder, A1a…Side existing main girder, A1b…Central existing main girder, A2…Leading main girder, A2a…Side leading main girder, A2b…Central leading main girder, a1·a2…Vertical crossbars, B…Receiving girder, B1…Existing receiving girder, B2…Leading receiving girder, b1·b2…Horizontal crossbars, C…Brace, C1·C2…Front space brace, D…Brace, D1·D2…Side space brace, E…Support column, E1…Existing support column, E2…Leading support column, Y…Side space, Z…Front space.

Claims

1. A temporary trestle construction method comprising a riding equipment mechanism including a rail body, a rail mounting member, and a gondola suspended from the rail body so as to be movable up and down and left and right, A step of installing a framework structure of a new construction stage in which a plurality of leading struts arranged in the transverse direction are driven in the erection direction from an existing stage, a leading receiving girder connecting between the heads of the leading struts is installed, and a side leading main girder among the leading main girders extending from the existing main girder to the leading receiving girder is arranged, A front space reinforcement connection step of connecting a cross beam and a brace that are connected in the transverse direction by spanning between the side leading main girders so that the rail body of the riding equipment mechanism is in the transverse direction, A side space reinforcement connection step of connecting a longitudinal beam and a brace that are connected in the longitudinal direction by spanning between the existing receiving girder and the leading receiving girder so that the rail body of the riding equipment mechanism is in the longitudinal direction, A formwork laying step of arranging a central leading main girder by projecting it from the existing main girder between the side leading main girders and providing a formwork on the side leading main girder and the central leading main girder, characterized in that the temporary trestle construction method has the above steps.

2. The riding equipment mechanism has a plurality of gondolas and a rail body composed of H-shaped steel sandwiched by trolleys, The gondola moves in the longitudinal direction of the rail body and is lifted and lowered by a winch, The temporary trestle construction method according to claim 1, characterized in that it has a rail mounting member for attaching the rail body to the framework structure.

3. A temporary trestle demolition method comprising a riding equipment mechanism including a rail body, a rail mounting member, and a gondola suspended from the rail body so as to be movable up and down, A formwork removal step of removing the formwork laid on the side leading main girder and the central leading main girder among the leading main girders extending from the existing main girder to the leading receiving girder and removing the central leading main girder, A side space reinforcement demolition step of demolishing the longitudinal beam and the brace connected in the longitudinal direction by spanning between the existing receiving girder and the leading receiving girder so that the rail body of the riding equipment mechanism is in the longitudinal direction, A front space reinforcement and disassembly process of disassembling a cross bar and a brace that are horizontally connected by spanning between the side front main girders so that the rail body of the boarding equipment mechanism is in the transverse direction. A temporary trestle demolition method characterized by having a framework structure installation process for a new construction stage of disassembling the side front main girders, disassembling the front receiving girder that connects between the heads of a plurality of front columns arranged in the transverse direction, and disassembling the front columns.

4. The boarding equipment mechanism has a plurality of gondolas and a rail body made of H-shaped steel clamped by trolleys. The gondola moves in the longitudinal direction of the rail body and is lifted and lowered by a winch. The temporary trestle demolition method according to claim 3, characterized by having a rail attachment member for attaching the rail body to the framework structure.

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