JP2008038546A - Pyron type overhang construction apparatus, and construction method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pyron type overhang construction apparatus and a construction method which reduce construction costs and a construction period. <P>SOLUTION: The pyron type overhang construction apparatus is used to support web members 7a (7b) or frame members of a PC bridge in an overhanging position. The pyron type overhang construction apparatus includes a pyron 1 anchored removably to the front end of an overhanging block at the existing side, a diagonal member 22 at the existing side which connects the pyron 1 to an existing block 23, and a diagonal member 5 at the new construction side which connects the front end of a web member 7a (7b) or frame member at the new construction side that is anchored in an overhanging position to a web member 7a (7b) or frame member of the existing block 23, to the pyron 1. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a pyrone-type overhanging device used when a PC bridge is overhanged and a construction method using the same.

  2. Description of the Related Art Conventionally, as a working device used when building a PC bridge overhanging, a construction device made up of a work vehicle (forverwagen) that can lay a rail on an existing bridge girder and travel on the rail in the bridge girder construction direction is known. (For example, refer to Patent Documents 1 and 4).

  Moreover, a construction apparatus having a jib crane on the upper part of the work vehicle (wagen) as described above is known (for example, see Patent Document 2).

In addition, there is also known a method of laying a bridge by installing a pyrone and supporting a girder with a diagonal material and suspending and supporting precast concrete as a main girder via the girder (for example, Patent Documents). 3).
JP 2001-200510 A JP 2003-166215 A JP 2004-270235 A Japanese Patent Laid-Open No. 5-79019

  When laying rails on a bridge body to allow a work vehicle (wagen) to travel, there is a problem that the apparatus becomes complicated and large, the apparatus becomes high, the construction period is long, and the construction cost is also high. .

When a work vehicle (wagen) is used as described above, a reaction force is applied to the rear of the work vehicle, so that the load and the overhang length in front of a new steel plate web or steel frame material are equivalent to one block ( For example, it is determined to be about 4m), and if you want to increase the forward load and overhang length, a large wage is required, and in order to make a large wage, it acts on the existing bridge girder (bridge body). Had to deal with the reaction force. Therefore, the steel plate web or the steel frame material cannot be extended for a long time on the new side.
The present invention advantageously eliminates the above-mentioned conventional problems, reduces the size and weight of the apparatus, and can extend the length of the steel sheet web or steel frame material to the new installation side, improve the construction efficiency, and reduce the construction cost and construction period. An object of the present invention is to provide a pyrone-type overhanging apparatus capable of shortening the length and a construction method using the same.

In order to solve the above-mentioned problem advantageously, in the pyrone-type overhanging device according to the first aspect of the present invention, in the pyrone-type overhanging device used for overhanging and supporting a web material or a frame material in a PC bridge, The equipment consists of a pyrone located at the tip of the existing extension block, an oblique member on the existing side connecting the pyrone and the existing block, and a new side fixed so as to overhang the web material or frame material of the existing block. It is characterized by comprising a diagonal member on the new side for connecting the tip of the web material or frame material and the pyrone.
In the second invention, in the pyrone-type overhanging apparatus according to the first invention, a detachable new anchor block is provided at the upper end of the web material or frame material on the new side, and the new side anchor block is interposed therebetween. The web material or frame material on the new installation side and the diagonal material are connected to each other.
In the third invention, in the pyrone-type overhanging apparatus according to the first or second invention, the suspension is supported on the upper side of the new web material or frame material via the new side front horizontal beam fixed to the new side anchor block. The pulling and pressing device for pulling out the working scaffold to be newly installed is detachably and positionally fixable.
In the pyrone-type overhanging construction method of the fourth invention, in the pyrone-type overhanging construction method using the pyrone-type overhanging device according to any one of claims 1 to 3, the pyrone can be attached to and detached from the tip of the existing overhanging block. The other end side of the existing diagonal member that is fixed and joined to the end of the web member or frame member of the existing overhanging block and integrated with the end of the existing web member or frame member and connected to one end of the pyrone Detachably fixed to the rear existing side block, the other end side of the other new side diagonal member connected one end side to the pyrone, removably connected to the tip of the web material or frame material on the new side, The web material or frame material on the new installation side is supported by extension, and then a new extension block including the web material or frame material on the new installation side is constructed.
In the fifth aspect of the invention, in the pyron overhang construction method of the fourth aspect of the invention, the working scaffold is moved forward by using the pulling and pressing device disposed on the upper side of the web material or the frame material. The end portion is connected to the leading end side of the new web material or frame material.
In a sixth invention, in the pyrone-type overhang construction method of the fourth or fifth invention, the web material comprises a web material comprising a corrugated steel web, or a web material core material assembled from a steel material. It is a web material made of a material.
In the seventh invention, in the pyrone overhang construction method according to any one of the fourth to sixth inventions, the pyrone can be transported and installed at the tip of the new bridge body by a traveling crane that moves on the existing overhang block. Features.

According to the first invention, it is possible to provide a simple and lightweight pyrone-type overhang erection device constituted by the pyrone and each diagonal member that connects this to the existing block or the new web material or frame material. .
In addition, in such a pyrone-type overhanging device, the block length that can be extended to the new installation side is determined by the strength of the pyrone, diagonal material, web material, or frame material. Compared to the case where a heavy wage is placed and used to support a work scaffold or a formwork, it is possible to extend and construct a longer work, for example, a web material or a frame material is a two block long member. can do. In addition, the apparatus of the present invention has a simple structure, and the apparatus can be easily transported and installed by a crane moving on an existing bridge body, and the crane needs to be always disposed on the front end side of the bridge body. Since there is no, the burden of the bridge body tip can be reduced. Moreover, since the transfer of the apparatus can be easily performed with a crane, the construction efficiency can be increased, the construction period can be shortened, and the construction cost can be reduced.
Further, the stiffening beam structure can be formed by the pyrone and the diagonal members on the existing side and the new side in the upper part of the existing side block and the new side web member or the frame member.
According to the second invention, when the diagonal material is directly connected to the web material or frame material on the new installation side, the diagonal material and the upper floor slab interfere with each other in the vicinity of the end portion. It is difficult to build up to the end of the material, but since the diagonal is connected via the new anchor block, there is no risk of interference between the diagonal and the upper floor slab. A new floor can be built.
According to the third aspect of the present invention, since the traction and pressing device is detachably and fixedly provided at the upper part of the newly installed web material or frame material, the working scaffold positioned on the existing side by the traction and pressing device. Can be easily pulled or pushed to the new side and placed at a predetermined position.
According to the fourth invention, the web material or frame material on the new installation side is fixed to the end of the web material or frame material of the existing extension block, and the pyrone is connected by connecting the diagonal material. The floor slab concrete and the formwork or work scaffold constructed on the new side in a state where the web material or the frame material can be reliably supported while being able to be a lightweight device with a simple configuration with the material, It can be reliably supported via a web material or a frame material.
In addition, in the upper part of the existing side block and the new side web material or frame material, the stiffening beam structure is formed by the pyrone and the existing side and the new side diagonal material, so that the work scaffold or floor slab on the new side Before placing the formwork or before placing the concrete on the new side, the existing side block and the new side web member or frame member can be in a more rigid state.
According to the fifth aspect of the present invention, the working scaffold can be moved forward by the pulling and pressing device and installed at a predetermined position. In addition, since the end of the diagonal member on the new side is connected to the tip side of the web material or frame material on the new side, work scaffolding, upper floor slab formwork, lower floor slab formwork, concrete load, etc. It is possible to load the existing block through the diagonal member connected thereto, and to the existing block through the diagonal member and the pyrone.
According to the sixth invention, when the web material is a web material provided with a corrugated steel web, the web material can be configured using an inexpensive corrugated steel plate, and the configuration of the web material is simplified. Further, if the frame material as the web material is a frame material provided with a web core material assembled from steel plates, the frame material provided with the web core material can be easily configured using various steel plates. It is possible to manufacture a frame material having a web core material at low cost by using an inexpensive steel plate and to increase the degree of freedom in designing the frame material.
According to the seventh invention, the traveling crane moving on the existing overhanging block can easily carry and install the pyrone on the new side, so the overhanging construction method that repeats the same process many times can increase the construction efficiency. The construction period and construction cost can be reduced.

    Next, the present invention will be described in detail based on the illustrated embodiment.

(For telescopic pyrone and diagonal materials)

  FIGS. 1 to 13 show a state in which a pyrone-type overhanging device 49 according to an embodiment of the present invention is used. The telescopic pyrone (extensible telescopic vertical column) 1 is a lower flange for mounting. The hydraulic jack 2 having 2 a, the support 3 attached to the top of the hydraulic jack 2, and the diagonal material fixing bracket 4 provided on the support 3 are provided. An upper flange 2c for attachment is provided at the tip of the movable piston 2b in the hydraulic jack 2, and a lower flange 3a of a steel pipe column 3 is attached to the attachment upper flange 2c in a dismountable manner with bolts and nuts. (See, in particular, FIGS. 1, 6 and 9).

  A steel frame-shaped diagonal material fixing bracket 4 is fixed to the upper end portion of the steel pipe column 3 by welding or the like, and has a face plate extending in the bridge axis direction and spaced in the front-rear direction. A horizontal shaft 6a of a PC steel material support block 6 is rotatably supported on the front side (newly installed side) of the fixing bracket 4, and the PC steel material support block 6 is tilted on the new side made of PC steel material. The rear end portion of the material 5 is inserted, and on the rear surface side of the PC steel material support block 6, the female screw member 5b screwed into the male screw portion 5a of the rear end portion of the new diagonal member 5 is supported via the support plate. Thus, the rear end portion of the diagonal member 5 on the newly installed side is fixed.

  The front end portion of the new-side diagonal member 5 is used for supporting the PC steel material of the new-side anchor block 8 fixed to the upper end portion of the new-side corrugated steel web 7a made of steel and having a cross section made of trapezoidal square corrugated steel plate. Locked to the block 6 in tension. In order to fix the diagonal member 5 on the new side in a tensioned state, the front end portion of the diagonal member 5 is inserted into the PC steel support block 6, and the left and right ends of the PC steel support block 6 have the new side A horizontal shaft 6a for supporting the anchor block 8 is provided, and the horizontal shaft 6a is rotatably supported by the newly installed anchor block 8 so that the newly installed diagonal member 5 is provided with the newly installed anchor block 8. (See FIG. 8).

The upper part of the new anchor block 8 is provided with a horizontal support flange 8a for fixing the new front side cross beam 9 extending in a direction perpendicular to the bridge axis. As described above, a support portion including a pair of front and rear vertical steel plates 8b for rotatably supporting the horizontal axis of the PC steel support block 6 is provided, and a corrugated portion is provided below each vertical steel plate 8b of the newly installed anchor block 8. A plurality of bolt insertion lateral holes 10 in the direction perpendicular to the bridge axis for attaching to the vertical ribs 12 on the upper part of the steel plate web 7a are provided at intervals in the bridge axis direction (see FIGS. 8 and 22).
The bolt insertion horizontal holes 10 of the vertical steel plates 8b are provided at the same pitch in the bridge axis direction, and are spaced apart in the direction perpendicular to the bridge axis to the upper flange 11 fixed integrally to the corrugated steel web 7a. At the same time, the vertical ribs 12 of the strip-shaped steel plate are arranged in parallel with the bridge axis direction, the lower portion of the vertical rib 12 is fixed to the upper flange 11 by welding, and the vertical steel plates 8b are outside the vertical ribs 12. It is placed on the upper flange 11 so as to be positioned, and is attached / detached by a plurality of detachable bolts / nuts 12b inserted and arranged across the vertical steel plate 8b and the bolt insertion lateral holes 12a of the vertical ribs 12 It is attached as possible.

  As shown in FIGS. 8 and 9, the connecting structure between the front end portion of the new diagonal member 5 and the upper front end portion of the new corrugated steel web 7a is a longitudinal cross section of a trapezoidal square corrugation, etc. The upper flange 11 is arranged horizontally and continuously on the upper end of the corrugated steel web 7a facing in the bridge axis direction, and is fixed in a horizontal state by welding or the like. The upper flange 11 is provided in a direction perpendicular to the bridge flange. A pair of vertical mounting ribs 12 are continuously provided in parallel so as to extend in the direction of the bridge axis, and a large number of bolts can be inserted through the mounting vertical ribs 12 at intervals in the direction of the bridge axis. The horizontal holes 12a are provided at the same pitch.

  Next, the existing concrete bridge 13 on which the prestress is introduced by tension-fixing the PC steel material 55 for floor slab (see FIG. 25), and the rail 14 laid on the existing bridge 13 are provided. The structure with the rear frame 15 in the mobile work scaffold device 48 that travels above will be described (see FIGS. 1 to 4).

  The rear frame 15 is an inverted portal frame, and includes an inward arm 16 projecting inwardly in a cantilevered manner at the top, and is mounted on the rail 14 at the lower end on the tip side of the inward arm 16. A traveling wheel 17 is provided, and the inward arm 16 is integrally provided with a vertical frame member 16b. The vertical frame members 16b are integrated with each other by a lower horizontal horizontal frame member 18. The lower horizontal frame member 18 of the reverse portal type rear frame 15 supports the rear side of the work scaffold 19, and the work scaffold 19 is supported so as to be movable in the bridge axis direction together with the rear frame 15.

The front side of the work scaffold 19 includes a front horizontal beam 9 fixed to the anchor block 8 on the newly installed side by bolts and nuts, and a suspension support device 20 provided so as to be suspended and supported by the front horizontal beam 9. It is installed and supported on the front support frame 24 supported via the.
The left and right ends of the front support frame 24 are supported by suspension by a suspension support device 20 having one end suspended from and supported by the front transverse beam 9 supported by the new anchor block 8. The suspension support device 20 includes a vertically oriented total thread different diameter PC steel rod 37, a support member 63a and a nut 63b that are attached to the upper end of the steel bar and supported by the front transverse beam 9, and the total thread different diameter PC steel. The support member 64a is mounted on the lower end side of the rod 37 and supports the lower surface side of the lower horizontal frame member 18 and a nut 64b.
The suspension support device 20 is slidable in the bridge axis direction together with the new anchor block 8 by removing the detachable bolts and nuts 38 that fix the new anchor block 8 to the vertical ribs 12. . In this case, the lower part of the anchor block 8 is slid and moved on the upper flange 11 in the direction of the bridge axis on the upper flange 11 by a pulling means such as a crane or a pulling or pressing means such as a telescopic jack.
A front suspension support device 25 is configured by the front horizontal beam 9, the suspension support devices 20 disposed at both left and right ends thereof, and the front support frame 24. A movable work scaffold device 48 is constituted by the front suspension support device 25, the rear frame 15, and the work scaffold 19 that is installed and fixed over these.

  The rear lower horizontal frame member 18 and the front support frame 24 include a pair of frame members that are spaced apart in the bridge axis direction and extend parallel to the direction perpendicular to the bridge axis. Further, a PC steel rod 37 having a different total thread diameter can be arranged. A scaffold frame member 39 having a length of about 4 blocks is installed in the bridge axis direction across the lower horizontal horizontal frame member 18 and the front support frame 24 at the rear part. In addition, the scaffolding frame material 41 is assembled and installed on the new side in a different stage, facilitating the installation work of the new side anchor block 8 or the new side end formwork.

  When the working scaffold device 48 is used in a fixed state, the rear lower horizontal frame member 18 and the concrete upper floor slab 26 in the existing bridge 13 are composed of a PC steel rod 37b having a total thread different diameter and its It is supported by support members 63a (64a) and nuts 63b (64b) installed on both upper and lower ends, and the front support frame 24 is fixed to the newly installed anchor block 8 so that the suspension support device 20 is interposed therebetween. Position is fixed. When the rear frame 15 is fixed in position, the intermediate portion of the lower horizontal frame member 18 in the rear frame 15 is supported by a suspension support device 89 supported by the existing bridge body 13, The bending load is prevented from acting greatly on the inward arm 16.

In the state where the fixed state is released and the rear frame 15 and the front suspension support device 25 are movable in the bridge axis direction, the front suspension support device 20 is moved forward, The rear frame 15, the front suspension support device 25, and the work scaffold device 48 can be moved together in the bridge axis direction. As the method of moving, the traction device (or the pushing device, details will be described later) on the new side (or the existing side) of the front suspension support device 20 in a state where the new corrugated steel web 7a is installed. A traction and pressing device or means) is provided and moved in the direction of the bridge axis.
The inward arm 16 and the front cross beam 9 in the rear frame 15 are integrally connected by a connecting frame 69 as shown in FIG.

  When the fixed state of the new anchor block (new fixing block) 8 is released and slid in the direction of the bridge axis, it will be newly added to the existing corrugated steel web 7b as will be described later. In the case where the corrugated steel web 7a is integrated by welding or bolts, the new anchor block 8 is moved when the work scaffold device 48 or the like is moved in the bridge axis direction. As the pulling device (or the pushing device or the pulling / pressing device or means) as the moving means, as shown in FIGS. 15 and 16 and FIGS. Alternatively, the reaction force body 21 is attached to the vertical rib 12 on the upper portion of the corrugated steel web 7a at the existing side position), and the PC steel material support block 6 and the reaction force body 21 in the newly installed anchor block 8 are supported by the reaction force body 21. By connecting the center hole jack 50 with the threaded connecting rod 23a and expanding and contracting the center hole jack 50, the bridge can be moved to the new side (or the existing side).

When the newly installed anchor block 8 slides on the newly installed corrugated steel web 7a, the bolts and nuts 38 fixing the lower part of the new anchor block 8 and the vertical ribs on the corrugated steel web 7a are removed. In this state, the working scaffold device 48 can be moved in the bridge axis direction using the reaction force body 21 and the center hole jack 50.
The newly constructed corrugated steel web 7a, the reaction force body 21 and the front suspension support device 25 are transported by a traveling crane 27 which is disposed so as to be able to travel on the existing bridge body 13. be able to.
As described above, in the present invention, the combination of the telescopic pyrone 1 and the endless track traveling crane 27 (see FIG. 14) traveling on the existing bridge body is used in comparison with the case of a conventional wage. As a result, it is possible to remarkably reduce the size and weight of the pyrone-type erection device excluding the crane 27 and improve the workability, and it is not necessary to arrange a reaction force receiver for the traveling crane 27 on the pier side. The reaction force receiving structure on the bridge body side becomes unnecessary, and only the pyrone side can be used.

A large number of upper floor slab form receiving beams 31 and lower floor slab form receiving beams 36 extending in the direction of the bridge axis are arranged above the work scaffold 19, and a large number of the lower floor slab form frame receiving beams 36 spaced in the direction perpendicular to the bridge axis are arranged. The floor slab form receiving beam 36 is supported by left and right moving beams 93 that extend in the direction perpendicular to the bridge axis, and is provided at the rear and front portions (also on the front side) of the upper slab form receiving beam 31. In the case where the upper floor slab is constructed and can be supported), each is a suspension support device supported by the existing upper floor slab 26, and the suspension vehicle type suspension support device 88 having a suspension vehicle 66 made of a support guide roller is used for the bridge. It is supported so as to be movable in the axial direction.
The movement beams 93 arranged at intervals in the left-right direction are supported by the upper floor slab form frame receiving beam 31 via the suspension support device 29, so that the bridge shaft is moved together with the movement of the upper floor slab form frame receiving beam 31. The suspension suspension support device 88 is supported by the upper floor slab 26 so as to be movable in the direction, and is moved in the direction of the bridge axis by the suspension suspension support device 88 having a suspension vehicle 66 composed of a support guide roller. Supported as possible.
The front part of the upper floor slab form receiving beam 31 and the front part of the moving beam 93 are both supported by the front side cross beam 9 on the new side via the suspension support devices 89 and 94 on the front side. By moving the front lateral beam 9 in the bridge axis direction, the upper floor slab form receiving beam 31 and the lower floor slab form receiving beam 36 can be moved so as to be drawn out to the bridge axis direction new side (see FIG. 3 and FIG. 4).
When the above suspension vehicle type suspension support device 88 is not used, a suspension support device 89 is provided on the upper floor slab form receiving beam 31 and the moving beam 93 and supported by the upper floor slab 26. It can be used fixed so as not to move.

Further, the support structure on the newly installed side of the upper floor slab form receiving beam 31 will be described with reference to FIGS. 1, 13 and 6. The existing upper floor slab 26 is projected to the newly built box girder block side. The upper floor slab form receiving beam 31 extending in the direction of the bridge axis is 3 blocks or more in the direction of the bridge axis from the new side to the new side (in the case of illustration, about half a block). Many are arranged at intervals in the direction perpendicular to the bridge axis. Each upper floor slab form receiving beam 31 has a structure in which a pair of support beam members 32 having a cross-sectional groove shape parallel to each other in the direction perpendicular to the bridge axis are connected by a connecting material.
The suspension wheel type suspension support device 88 that supports the front portion or the middle portion of the upper floor form receiving beam 31 is a suspension vehicle that includes a pair of support guide rollers that support the lower flange lower surface of each support beam member 32. The suspension support device main body 33 provided with 66 and a screw rod 34 on the upper portion thereof are provided. The upper screw rod 34 is inserted into the existing upper floor slab 26, and the existing upper floor slab 26 is supported by a support member 63a and a nut 63b. The support beam member 32 is supported through a suspension wheel 66 composed of the support guide roller (see FIG. 13).
In the gap between the pair of support beam members 32, a vertical screw rod such as the above-mentioned total thread different diameter PC steel bar is inserted and arranged.

  The face plate-like lower floor slab form receiving beam 36, which is disposed below the lower floor slab 35 in the existing bridge 13 and has a length of two blocks or more in the bridge axis direction, is 2 blocks in the bridge axis direction. The length is about half the length, and the intermediate portion in the direction perpendicular to the bridge axis is supported by the moving beam 93 via the suspension type suspension support device 88 and the suspension support device 29 supported by the suspension type suspension support device 88. Thus, it can be moved in the direction of the bridge axis together with the upper floor formwork receiving beam 31 (see FIG. 4). The vertical screw rod 34 at the upper part of the suspension type suspension support device 88 is supported by the upper floor slab 26, and the vertical total thread different diameter PC steel rod 37c in the suspension support device 29 connected to the suspension connection member 42 is provided. The upper end portion of the frame is configured to be supported by a support member 63a and a nut 63b disposed on the upper surface of the suspension connection member 42 that connects the upper floor slab form receiving beams 31 spaced apart in the direction perpendicular to the bridge axis. (See FIG. 4).

At both ends of the moving transverse beam 93 in the direction perpendicular to the bridge axis, the front receiving beam 9 (or the upper floor slab 26 in the existing bridge 13) is vertically moved via a level adjusting suspension support device 94 having a chain block 92. It is supported so that the level of the direction can be adjusted (see FIG. 3).
The lower part of the vertical total thread different diameter PC steel rod 37b is inserted in the middle part of the movable transverse beam 93 in the direction perpendicular to the bridge axis, and the total thread is formed on the lower surface side of the lower floor slab form receiving beam 36. It is supported by a bearing member 64a and a nut 64b mounted on the different diameter PC steel rod 37b, and the upper end portion of each total screw different diameter PC steel rod 37c is inserted into the suspension connection member 42 and the suspension connection member. 42, and is supported on the suspension coupling member 42 by a bearing member and a nut mounted on the PC steel rod 37c having a total thread different diameter, and an end portion of the suspension coupling member 42 is a bridge shaft. An existing box is provided via a suspension-car-type suspension support device 88 having suspension vehicles 66 each composed of an upper floor slab form frame receiving beam 31 on the side end in the perpendicular direction and a support guide roller for supporting the upper floor slab form frame reception beam 31. Digit bro It is supported by the top floor plate 26 in the click 23.

The both ends of the suspension connecting member 42 are supported on the lower surface side by a support member and a nut attached to the total thread different diameter PC steel rod 37c, and an upper end portion is provided at an intermediate portion of the suspension connecting member 42. The lower part of the PC screw rod having a vertical total thread different diameter that is locked is inserted into the moving beam 93, and the PC screw bar having a different total screw diameter (or a vertical screw rod) on the lower surface side of the moving beam member 93. It is supported by a support member and a nut attached to the.
A lower floor slab formwork 85 is installed on the lower floor slab form receiving beam 36 on the moving beam 93 supported so as to be adjustable in the vertical direction so that the height can be adjusted.

  In order to fix the new anchor block 8, a plurality of bolt insertion lateral holes 10 are provided at the lower end of the new anchor block 8 at intervals in the bridge axis direction. A plurality of bolt insertion lateral holes 12a are provided at an upper end portion on the new side of the steel plate web 7a at intervals in the bridge axis direction. Bolts are inserted through the lateral holes and the nuts are tightened. The new anchor block 8 is detachably attached to the front end portion of the new corrugated steel web 7a.

Next, a structure in which the existing side diagonal member 22 provided with the PC steel material made of the PC steel stranded wire in the intermediate portion is fixed to the existing side anchor block 30 will be described with reference to FIGS. 1 and 7.
On the rear side (existing side) of the fixing bracket 4, a horizontal shaft 6a of a PC steel material support block 6 is rotatably supported, and a PC having a threaded sleeve provided at both ends of a PC steel stranded wire. The front end portion of the PC steel material 22c in the diagonal member 22 on the existing side provided with the steel material is inserted into the PC steel material support block 6, and on the front side of the PC steel material support block 6, the front end portion of the PC steel material 22c. The front end portion of the PC steel material 22a is supported by a support plate inserted into the male screw portion 22a and a screwed female screw member 22b.

The rear end portion of the PC steel material 22a in the existing diagonal member 22 is inserted into a PC steel material support block 6 rotatably attached to the front end portions of the pair of connecting arms 46, and the PC steel material support block 6 is inserted. It is locked by a support plate disposed on the rear surface side and a female screw member 22b mounted on the PC steel material 22a. The existing diagonal member 22 includes a PC steel member 22c, a connecting arm 46, and the like.
The rear end portion of the connecting arm 46 is pivotally connected to the existing anchor block 30 by a horizontal shaft 47, and the existing oblique member 22 is fixed to the fixing bracket 4 and the existing bridge body 13. Are connected in tension to the existing bridge body 13 via the existing anchor block 30.
As the PC steel material of the diagonal member 5 on the new side and the diagonal member 22 on the existing side, a steel sleeve is fitted and fixed to the end portion of the PC steel material made of PC steel stranded wire, and a male thread portion is formed on the outer surface of the sleeve. If both ends are equipped with male threaded shafts, and the middle part is made of PC steel made of PC steel stranded wire, it is easy to mount and remove, and because it is flexible, the diagonal member is bent on the bridge body. Even when the telescopic pyrone 1 is lifted and transported, it can be transported and installed with one side of the diagonal member connected to the telescopic pyrone 1.

  Next, the configuration of the existing anchor block 30 that is detachably installed on the upper floor slab 13 and the relationship with the upper floor slab 13 will be described.

First, the configuration of the existing anchor block 30 will be described. The existing anchor block 30 is made of a steel material, has a hanging metal fitting 44 having a horizontal hole on the upper surface, and protrudes downward on the lower surface side. A columnar shear key 43 is provided. At the four corners in the front-rear direction and the left-right direction, there are provided PC steel material insertion holes penetrating in the vertical direction for fixing them to the existing upper floor slab 26 with the vertical PC steel material 90 for anchor block fixing, By fitting and arranging in the recess or the vertical hole 45 provided in the upper floor slab 26, the diagonal material 22 is put in a tension state, the work scaffold on the new side, the formwork receiving beam, the formwork, and the concrete to be placed When bearing a load, it is configured to be able to counter the horizontal shearing force acting on the existing anchor block 30 together with the above-mentioned vertical PC steel member 90 with a screw (see FIG. 7).
As a form in the case of fixing the existing anchor block 30, as shown in the figure, an anchored female screw fitting 91 is embedded and fixed in the existing upper floor plate 26, and the lower end portion of the vertical PC steel member 90 is connected. You can also
A base end side of a pair of connecting arms 46 is pivotally attached to a lower portion of the existing anchor block 30 by a horizontal shaft 47. The PC steel material support block 6 is disposed on the new side between the pair of connection arms 46, and the support shafts 6a on both the front and rear sides of the PC steel material support block 6 are rotatably supported by the connection arm 46. (See FIG. 7).

  More specifically, a connecting arm 46 in which connecting arm pieces are arranged on both front and rear sides of the PC steel material support block 6 so as to fit the support shafts 6a on both front and rear sides of the PC steel material support block 6 is provided. Yes.

  The rear end portion (existing side end portion) of the connecting arm 46 is rotatably connected to the existing side anchor block 30 by a horizontal shaft 47, and the existing side anchor block 30 is connected to the existing side bridge body 13. A concrete upper floor slab 26 is detachably connected.

  In the case where the existing diagonal member 22 made of an existing PC steel material whose intermediate portion is a PC steel stranded wire is placed in tension in the connecting arm 46, as shown in FIG. 7B. The hollow steel 51 of the center hole jack (tensioning jack) 50 is engaged with the PC steel material support block 6 side, and the tensioning screw rod 52 is attached to the rear end portion of the existing side diagonal member 22 as a female screw member. 53, the tension screw rod 52 is disposed in the center hole jack 50, and a female screw member 54 screwed into the tension screw rod 52 is attached to the rear portion of the tension jack. The jack 50 is extended so that the existing PC steel material 22c is pulled, and the female screw member 22b that is separated from the PC steel material support block 6 is replaced with a PC steel material support block. Is rotated in a direction to approach by engaging, it can be fixed across the diagonal members 22 including the existing side of the PC steel 22c under tension to.

The existing anchor block 30 is detachably fixed to the existing bridge 13.
Since the shear key 43 protruding downward is provided at the lower part of the existing anchor block 30 as described above, even when a large tensile force in the bridge axis direction acts on the existing diagonal member 22, it is possible to bear a sufficient burden. Has been made possible.

  The lower end of the lifting-use locking metal fitting 30a is fixed to the upper end of the existing anchor block 30, and the existing vertical anchor block 30 is removed by removing the threaded vertical PC steel member 90 fixing the existing anchor block 30. In the free state, the crane can be transported to the new side by the traveling crane 27 that travels on the bridge body using the lifting latch 30a.

By using the existing side anchor block 30, the existing side diagonal member 22, the telescopic pyrone 1, the new side diagonal member 5, and the new side anchor block 8, a pyrone type overhanging device unit on one side in the direction perpendicular to the bridge axis. 56, and the above-described pyrone-type overhanging device units 56 are installed in parallel in the direction perpendicular to the bridge axis and spaced in parallel, and the fixing bracket 4 between the pyrone-type overhanging device units 56 adjacent to each other in the direction perpendicular to the bridge axis. They are connected to each other by an extendable horizontal connecting member 57 that is detachable and adjustable in length. The outside of the fixing bracket 4 in the direction perpendicular to the bridge axis and the existing block are connected by a detachable diagonal member in the direction perpendicular to the bridge axis provided with tension means such as a chain block to hold the telescopic pyrone 1 in a predetermined standing position. is doing. The extendable pyrone 1 is detachably fixed to the tip of the existing extension block.
The telescopic horizontal connecting member 57 is screwed and connected to the housings 62 arranged on both sides thereof via intermediate members 61 with handles having right male screw shaft portions or left male screw shaft portions having different screw directions at both ends. By rotating the intermediate member 61 with a handle for rotation, it can be shortened or extended.
The telescopic horizontal connecting member 57 is connected to a connecting bracket 58 provided on the fixing bracket 4 so as to project in a direction perpendicular to the bridge axis by a detachable horizontal shaft such as a bolt and a nut (see FIG. 9).

  As described above, each of the pyrone-type overhanging device units 56 is provided so that it can be assembled and disassembled, and is provided so as to be connectable to and detachable from the telescopic horizontal connecting member 57. A pyrone type overhanging device 65 according to an embodiment of the present invention is configured by the type overhanging device unit 56. It should be noted that only the pyrone-type overhanging device unit 56 may constitute the pyrone-type overhanging device 65, and three or more pyrone-type overhanging device units 56 are connected and arranged at intervals in the bridge axis direction. Thus, the pyrone overhanging device 65 may be configured.

  Next, the rear part of the bridge axis direction (existing side) with respect to the formwork receiving beam for supporting the formwork and the apparatus for suspending and supporting the formwork receiving beam that is arranged on the lower side of the upper floor slab 13 on the existing side or on the new side. And the front part (new side) will be described separately. First, the existing side will be described with reference to FIGS.

On the lower side of the concrete upper floor slab 26 in the existing bridge body 13, an upper floor slab form receiving beam 31 having a pair of cross-sectional groove-shaped members is disposed in parallel with a gap in a direction perpendicular to the bridge axis. The intermediate portion of the frame receiving beam 31 is supported by a suspension-type suspension support device 88 having a suspension vehicle 66 provided on the distal end side of the existing bridge body 13 so as to be slidable in the bridge axis direction. A vertical rod 60a such as a PC steel rod having a different total screw diameter in the suspension wheel type suspension support device 88 is inserted and disposed in a vertical hole of the concrete upper floor slab 26 of the existing bridge body 13, and a support member (support washer) 63a and It is supported by a female screw member 63d such as a nut.
The movable horizontal beam 93 is moved up and down via the suspension connecting member 42 and suspension support devices 29 and 94 supported by a pair of upper floor slab form receiving beams 31 spaced at both ends in the direction perpendicular to the bridge axis. It is supported so that the level can be adjusted in the direction and can be pulled out in the direction of the bridge axis.

  Forms 84 and 85 indicated by a two-dot chain line in FIG. 3 and the like are supported via the upper floor form frame receiving beam 31 or the lower floor form form receiving beam 36 so that the position in the vertical direction can be adjusted.

  The upper floor slab form receiving beam 31 and the movable lateral beam 93 positioned on the front side in the bridge axis direction are supported by the suspension support devices 89 and 94 supported on the upper floor slab 26 or the front lateral beam 9 to thereby determine the predetermined value. The position can be held in a stable state.

  When supporting the formwork or the concrete placed in the formwork without moving the upper floor formwork receiving beam 31 and the moving lateral beam 93, the suspension supported from the existing upper floorboard 26 is used. Supported by a lowering support device.

  Next, referring to FIG. 17 and FIG. 24, a traction moving device (or a traction and pressing device capable of traction movement or pressing movement) 70 that moves each upper floor formwork receiving beam 31 and the like to the new installation side will be described. explain.

In the illustrated embodiment, the pulling and moving device 70 includes a movable cross beam 72a that supports the upper portion of a vertical rod 60a made of a PC steel material that is connected to and suspended from the upper floor form receiving beam 31. In the lower part, a vehicle body 71 with a roller is provided. That is, each roller-equipped vehicle body 71 is placed on the upper flange of each corrugated steel web (web material or frame material) so as to be movable in the bridge axis direction, and the cross beam 72 is constructed and fixed over the upper portion of each roller-equipped vehicle body 71. By synchronously driving the center hole jacks 50 arranged at intervals in the direction perpendicular to the bridge axis, the vehicle bodies 71 with rollers adjacent in the direction perpendicular to the bridge axis can be simultaneously moved in the bridge axis direction.
A movable horizontal beam 72 with a vehicle body that is fixed to the roller-equipped vehicle body 71 so as to be movable in the direction of the bridge axis together with the vehicle body 71 with a roller, and a PC that is rotatably provided on the vehicle body 73 in the movable lateral beam 72 with the vehicle body by a horizontal shaft 6a. Bridge bolts 23a that are connected in the bridge axis direction through the steel support block 6 and nuts 75 that are attached to both ends thereof, and bolt insertion holes in the upper part of the new web material (or frame material). A reaction force body 21 that is detachably fixed to the vertical rib 12 and a center hole jack 77 that is disposed on the back surface of the reaction force body 21 and is engaged with a nut 75 that is attached to the connecting bolt 23a. Has been.
The lower part of the reaction force body 21 is formed as a bifurcated leg portion 21a and includes a plurality of bolt insertion through holes spaced in the bridge axis direction. The leg portion 21a of the reaction force body 21 includes Similarly to the anchor block 8 on the newly installed side, a plurality of position fixing members are arranged so as to straddle the longitudinal ribs 12 spaced in the front-rear direction and are inserted through the leg portions 21 a and the longitudinal ribs 12. The bolts and nuts 38 are detachably fixed.
In the case of moving to the newly installed side in the bridge axis direction, the bolts and nuts 38 for fixing the position are removed, and the reaction force body 21 is slid and fixed in the direction of the bridge axis by an operator etc. By extending the hole jack 77, the upper floor slab form receiving beam 31 can be moved to the new side via the horizontal beam 72.
Further, when the upper floor slab form receiving beam 31 is further moved to the bridge axis direction newly installed side, as shown in FIG. 20, the reaction force body 21 is moved by a crane or the like so as to be positioned on the existing side of the movable horizontal beam 72. The movable horizontal beam 72 is pushed to the front end of the newly installed web member 7a by moving and fixing to the vertical rib 12 and extending the center hole jack 77 provided on the reaction body 21 so as to push the movable horizontal beam 72. By locating in the part, the upper floor slab form receiving beam 31 and the movable horizontal beam 93 and the lower floor slab form receiving beam 36 suspended and supported via the upper floor slab form receiving beam 31 can be moved to a predetermined new construction position.
Then, with the upper floor form receiving beam 31 and the movable horizontal beam 93 arranged at predetermined positions as described above, the upper floor is removed from the suspension support state via the suspension-type suspension support device 88 provided with the support roller 66. The plate 26 or the front cross beam 9 is suspended and supported so as to take a reaction force, and is replaced with a suspension support device including a support plate and a female screw member, and the position is reliably fixed by adjusting the level to a predetermined level. The In order to install the suspension support device, the upper floor slab 26 is appropriately provided with a vertical hole.

  Next, a construction method and a construction procedure for sequentially building the box girder PC bridge 80 in the direction of the bridge axis using the above-described pyrone-type overhanging device 65 of the present invention, the traveling crane 27, and the traction moving device 70. Will be described with reference to FIGS.

(First step)
In the state of FIG. 14, the box girder block at the end in the bridge axis direction is built, placed in the concrete upper floor slab and in the concrete lower floor slab, connected to the existing side block and tension fixed. It is integrated with PC steel (see FIG. 25), and the pyrone type overhanging device 65 and the traveling crane 27 of the present invention are installed on the bridge 13, and the corrugated steel web (web) 7b is installed on the new side. It is a figure which shows the 1st process.
By the traveling crane 27 arranged on the existing box girder block 23, the web material (or frame material) 7 b on the new side is integrated with the web material 7 a in the existing box girder block 23 integrated with the existing bridge body 13. In order to construct a new box girder block 82, the new side web member 7b is installed and fixed on the new side. The connection and integration of the existing and new web members 7b are integrated by welding or bolts.
As the new web material, a web material or a frame material having a length of one block may be continuously constructed for two blocks, and the web material has a length of about two blocks in the bridge axis direction. Alternatively, a frame material may be used and is advantageously as long as possible.

  When constructing the next new box girder block, it is necessary to support the load when placing concrete by the pyrone-type overhanging device 65, but the pyrone-type overhanging device 65 of the present invention has been relocated. The timing to do can be set according to the weight of the work scaffold device 48.

That is, depending on whether the weight of the work scaffold device 48 is heavy or light, the pyrone overhanging device 65 is moved before the forward movement of the work scaffold device 48 to improve the support performance; It is a form which moves after the movement of the working scaffold apparatus 48, and improves support performance. A case where the weight of the work scaffold device 48 is heavy and the pyrone overhanging device 65 needs to be transferred first will be described as a second step.
When the work scaffold device 48 is light and the weight of the scaffold is supported only by the mutual joining of the webs 7a and 7b (or 7b and 7b), the work platform 19 is advanced, and then the pyrone-type overhanging device 65 is moved forward. Is moved to support the work scaffold device 48 and the upper floor formwork receiving beam 31 or the moving beam 93, but the structure is the same as described above. When the pyrone overhanging device 65 is moved, the telescopic pyrone 1 and the diagonal members 5 and 22 may be lifted by the traveling crane 27 and transported and installed on the new upper floor slab 26. In order to move the front horizontal beam 9 or the movable horizontal beam 71, the reaction force body 21 may be installed, slid over the upper flange 11, and then attached to a predetermined position.

(Part 2 of the second step: When the weight of the scaffolding material is heavy and the weight of the scaffolding cannot be supported only by joining the web material)
FIG. 15 shows a second step, in which a new web (or frame material) 7a is newly attached to the new side of the existing web 7b by welding or bolts, and then each diagonal member 5, 22 is shown. Remove the connecting part with the bridge body 13 or web material on the opposite side to the telescopic type pyrone side, attach the diagonal members 5 and 22 to the telescopic type pyrone 1, and fix the lower part of the telescopic type pyrone 1 with the screw The PC steel material 86 is removed, the telescopic pyrone 1 is lifted by the traveling crane 27, and is transported forward in the direction of the bridge axis, and the telescopic pyrone 1 and the existing diagonal member 22 attached thereto are placed on the new upper floor slab 26. The diagonal member 5 on the new side is fixed in the same manner as described above. Further, the traveling crane 27 is set at a position appropriately separated from the end of the existing box girder block 23.
In addition, the existing side diagonal member 22 and the new side diagonal member 5 are respectively connected to the upper floor slab 26 of the existing side and the upper end portion of the new side web member 7a (or frame member) in the same manner as described above.

  A tensioning device such as a center hole jack 50 is arranged outside the PC steel material support block 6 at the end of each diagonal material 5, 22 to tension the diagonal materials 5, 22. Further, if necessary, the telescopic hydraulic jack 2 in the telescopic pyrone 1 may be extended to tension the entire apparatus including the diagonal members 5 and 22 so as to exhibit the supporting performance.

  As described above, immediately after the installation of the new web material 7b, the telescopic pyrone 1 is immediately fixed to the bridge 13, and the diagonal members 5, 22 are attached to the existing bridge 13 or the new corrugated steel web 7a. It stiffens by connecting. The upper floor slab 26 is provided with a recess or a through hole in advance so that the vertical shear key 43 in the existing anchor block 30 can be fitted and installed.

(Third step)
As described above, after moving the work scaffold 19 to a predetermined position on the new installation side, the upper floor slab form receiving beam 31 and the moving beam joint 93 and the lower floor slab form receiving beam 36 on the existing side and The formwork 84, 85 (see FIG. 3) of the supported upper and lower floor slabs is moved to the new installation side. When moving the molds 84 and 85, the fixed state portion by the existing side bridge body 13 and the vertical PC steel material with the screw is opened in advance, and the slide side can be moved to the new side in the bridge axis direction. Keep it.

(Fourth process)
Reinforcing bars and PC steel are assembled in the upper floor slab form 84 and the lower floor slab form 85. Further, as shown in FIG. 25, the floor slab PC steel material 55 arranged in the bridge axis direction sideways in the sheath of the upper floor slab 26 and the lower floor slab 35 on the existing side in the bridge axis direction is used for the floor slab on the new side. The PC steel material 55 is connected by a connecting joint 95 such as a coupler.
(Fifth step)
Next, as shown by two-dot chain lines in FIGS. 1, 3, and 4, concrete 83 (shown by a solid line in FIG. 13) is placed in the new upper floor formwork 84 and in the new lower floor formwork 85. Curing and curing. After confirming that the concrete 83 exhibited a predetermined strength, the PC steel material 55 for the new floor slab is tensioned to fix the end portion thereof, and the existing side floor slabs 26 and 35 and the new side floor slab 26 are fixed. , 35 are integrated. That is, the new box girder block 82 is integrated with the existing box girder block 23.

(Sixth step)
In order to open the existing side end of the existing diagonal member 22 to which the telescopic pyrone 1 is fixed and the new side end of the new diagonal member 5, the diagonal members 5, 22 are loosened. In such a case, each of the diagonal members 5 and 22 is loosened by shortening the telescopic pyrone 1 or rotating the nuts (female screw members) of the fixing portions at the ends of the diagonal members 5 and 22 themselves. Can be made. Further, the connection with the existing anchor block 30 at the end of the existing diagonal member 22 on the opposite side of the telescopic pyrone 1 is released, and the vertical PC steel member 90 fixing the existing anchor block 30 is removed to provide the existing The new diagonal member 5 is separated from the new anchor block 8, and the new anchor block 8 and the front cross beam 9 are movable in the direction of the bridge axis. Using the traveling crane 27, the telescopic pyrone 1 is moved to the vicinity of the tip of the new block (front block), and the vertical PC steel material 90 is reused and fixed to the new upper floor slab 26 equally. (See Figures 1 and 13)

  15 shows that the new anchor block 8 and the front cross beam 9 are pulled to the new installation side by the reaction force body 21 and slid on the upper flange 11 at the upper end of the corrugated steel sheet web 7a on the new installation side. It is process drawing which shows the state in the middle of moving the apparatus 48 to the new installation side.

  In FIG. 16, the reaction force body 21 is arranged on the upper flange 11 side on the existing side in the bridge axis direction with respect to the newly installed side anchor block 8 and the front cross beam 9 and fixed to the vertical rib 12. FIG. 6 is a process diagram showing a state in which the front cross beam 9 is slid on the upper flange 11 at the upper end of the corrugated steel web 7a (7b) and the work scaffold device 48 is slid to the new side end.

  In the illustrated embodiment, the corrugated steel web 7a (7b) is provided with an upper flange 11 and a rear frame 11b above and below, and the vertical ribs 12 are spaced from the upper flange 11 in the direction perpendicular to the bridge axis so as to extend in the bridge axis direction. In this embodiment, a plurality of bolt insertion holes are provided in the longitudinal ribs 12 at intervals in the bridge axis direction. However, instead of the corrugated steel web 7a (7b), a diagonal member or a frame member is provided. The main girder web material may be formed in the same manner as the corrugated steel web, etc., and the main girder web material is provided with the upper flange 11 as described above, and the pair of vertical ribs 12 are fixed to the upper flange 11. You may make it do.

  When the present invention is carried out, the reaction force body 21 is installed on the vertical rib 12 on the upper flange 11 to move the new anchor block 8, the front horizontal beam 9 as the moving beam, or the movable horizontal beam 72 with the vehicle body. As a means, it may be suitably towed and moved by a towing device provided with a rope or a chain, etc., or the rear frame 15 may be pushed by a towing and pressing device or means equipped with a hydraulic jack or the like. The rear part of the formwork receiving beam 31 may be pushed and moved to the new installation side.

Moreover, when implementing this invention, what is necessary is just to provide the shear key 43 of the existing side anchor block 30, and may omit this. Moreover, in the case of the said embodiment, although the form which uses an expansion-contraction type pyrone was shown, when implementing this invention, it is good also as a pyrone (vertical support | pillar) of the form which does not expand-contract.
When the present invention is implemented, digit blocks other than box digit blocks may be constructed.

  When practicing the present invention, instead of a web material such as a corrugated steel web or a flanged corrugated steel web, a frame material such as a truss structure may be used as the web material, or later coated with mortar, concrete, or the like. A steel web core material may be used as the web material. As the core material for the web material, a frame material obtained by assembling a steel material into a girder structure such as a truss structure by bolts or welding, etc. may be used as the core material for the web material and later fire-resistant coated with concrete or the like. You may make it use the flame | frame material by which the core material for material was fire-proof coated.

  As described above, after moving the scaffold forward using the front cross beam provided movably along the upper side of the web material or the frame material, it is efficient to connect the other diagonal member to the tip of the corrugated steel sheet. The scaffold can be moved to the new side.

  When the telescopic pyrone 1 can be expanded and contracted and the lengths of the diagonal members 5 and 22 can be adjusted as described above, the tension to be introduced to the diagonal materials 5 and 22 can be adjusted. Or by extending and retracting the pyrone 1, it is possible to efficiently adjust the tension of the diagonal members 5, 22, and to remove the diagonal members 5, 22, shorten the pyrone 1 side. Accordingly, the diagonal members 5 and 22 can be easily relaxed, and in the relaxed state, the fixing work on the lower end side of the PC steel materials 5C and 22 can be easily removed.

  As described above, the end portions of the diagonal members 5 and 22 are supported by the PC steel material support block 6 rotatably supported via the female screw members. Can be made to act only on axial force.

  As described above, if the end side of the existing diagonal member 22 is connected to the existing anchor block 30 via the connecting arm 46, the tensioning device cannot be disposed outside the existing anchor block 30. Even in this case, a tensioning device such as a center hole jack can be arranged between the connecting arm pieces spaced apart from each other in the connecting arm 46 so that the PC steel material 22C can be easily tensioned or relaxed, or the tension can be adjusted. Can be improved.

It is a partial longitudinal cross-sectional side view which shows the state which has extended the PC bridge using the pyrone type extension installation apparatus of one Embodiment of this invention. It is a top view of FIG. FIG. 3 is a partially omitted front view seen from the front side in FIG. 2. FIG. 3 is a partially longitudinal front view seen from the vicinity of an existing block in FIG. 2. It is a front view which expands and shows a part in FIG. It is a figure which expands and shows the pyrone base end part and existing bridge body vicinity in FIG. (A) is a partially longitudinal side view in which the vicinity of the existing anchor block in FIG. 1 is enlarged, and (b) is a female screw member connected to the end of the diagonal member and a male screw attached to the female screw member in order to tension the diagonal member. It is a partially longitudinal side view of a state in which a rod-shaped member, a center hole jack and a nut are mounted. FIG. 2 is an enlarged view of the vicinity of a front cross beam in the upper right part in FIG. 1. FIG. 3 is a partially cutaway plan view showing a part of FIG. 2 in an enlarged manner. It is a top view which expands and shows the front horizontal beam vicinity of FIG. (A) is a front view which shows the support apparatus which has a guide roller, (b) is the side view. 3 shows a part of FIG. 3, wherein (a) is a partially longitudinal side view showing the relationship between an existing side upper floor slab, an upper floor slab form receiving beam, and a support device, and (b) is an existing side upper floor. It is a partially longitudinal side view which shows the relationship between a plate | version | printing, a lower formwork receiving beam, and a support apparatus. The rear part of the upper slab formwork receiving beam is supported on the existing upper floor slab by the vertical PC steel material and the supporting members and nuts attached thereto, and the front part of the upper slab formwork receiving beam is supported by the front receiving beam on the new side. FIG. 3 is a partially longitudinal side view of a state in which concrete can be placed in a mold frame supported by each mold frame receiving beam, supported by a vertical PC steel material, a support member attached thereto, and a nut. It is a partial longitudinal cross-sectional side view which shows the 1st process which shows the process in the case of transferring the pyrone type overhang | projection installation apparatus of this invention, and the apparatus relevant to this. It is a partially longitudinal cross-sectional side view which shows the 2nd process which shows the process in the case of transferring the pyrone type overhang | projection installation apparatus of this invention, and the apparatus relevant to this. It is a partial longitudinal cross-sectional side view which shows the 3rd process which shows the process in the case of transferring the pyrone type overhang | projection installation apparatus of this invention, and the apparatus relevant to this. It is a partial longitudinal cross-sectional side view which shows the 4th process which shows the process in the case of transferring the pyrone overhang | extension installation apparatus of this invention, and the apparatus relevant to this. It is a partial longitudinal cross-sectional side view which shows the 5th process which shows the process in the case of transferring the pyrone type overhang | projection installation apparatus of this invention, and the apparatus relevant to this. It is a partial longitudinal cross-sectional side view which shows the 6th process which shows the process in the case of transferring the pyrone type overhang | projection installation apparatus of this invention, and the apparatus relevant to this. It is a partial longitudinal cross-sectional side view which shows the 7th process which shows the process in the case of transferring the pyrone type overhang construction apparatus of this invention, and the apparatus relevant to this. It is a partial longitudinal cross-sectional side view which shows the 7th process which shows the process in the case of transferring the pyrone type overhang construction apparatus of this invention, and the apparatus relevant to this. It is a figure which expands and shows a part of FIG. It is a partially longitudinal front view showing the vicinity of the corrugated steel web, the upper flange and the vertical rib. It is a figure which expands and shows the movable horizontal beam vicinity of FIG. It is a figure which shows the connection fixation part of the newly installed floor slab with respect to the existing floor slab by fixing the tension | tensile_strength PC steel material for floor slab.

Explanation of symbols

1 Telescopic pyrone (pylon)
2 Hydraulic Jack 2a Lower Flange 2b Movable Piston 2c Upper Flange 3 Strut 4 Diagonal Material Fixing Bracket 5 Diagonal Material 5a Male Screw 5b Female Screw Member 6 PC Steel Bearing Block 6a Horizontal Shaft 7a Corrugated Steel Plate Web (Web Material) on the New Installation Side
7b Corrugated steel web on existing side (web material)
8 New installation side anchor block 8a Support flange 8b Vertical steel plate 9 New installation side front beam 9a Support beam material 10 Bolt insertion side hole 11 Upper flange 11b Lower flange 12a Bolt insertion side hole 12 Vertical rib 13 Existing side bridge Body 14 Rail 15 Rear frame 16 Inward arm 16b Vertical frame member 17 Traveling wheel 18 Lower horizontal frame member 19 Working scaffold 20 Front suspension support device 21 Reaction force body 21a Leg portion 22 Diagonal member 22a on the existing side Male thread portion 22b Female thread member 22c PC steel 23 Existing box girder block (Existing block)
23a Threaded connecting rod 24 Front support frame 25 Front suspension support device 26 Upper floor slab 27 Traveling crane 29 Suspension support device 30 Existing anchor block 30a Lifting locking bracket 31 Upper floor slab frame receiving beam 32 Support beam Material 33 Suspension support device main body 34 Screw rod 35 Lower floor slab 36 Lower floor slab form receiving beam 37 Vertically oriented total screw different diameter PC steel rod 37b Total screw different diameter PC steel rod 37c Bearing member and nut 38 Bolt 39 Scaffolding Frame 40 Scaffolding plate 41 Scaffolding frame member 42 Suspension connecting member 43 Steel shear key 44 Suspension bracket 45 Vertical hole 46 Connecting arm 47 Horizontal shaft 48 Mobile work scaffold device 49 Pilon type extension installation device 50 Center hole jack (for tension) jack)
51 Hollow piston 52 Tension screw rod 53 Female screw member 54 Female screw member 55 PC steel material for floor slab 56 Pilon-type overhanging construction device 57 Telescopic horizontal connecting member 58 Connecting bracket 59 Intermediate member 60a with pivot handle 61 Vertical rod 61 With handle Intermediate member 62 Housing 63a Bearing member 63b Nut 64a Bearing member 64b Nut 65 Pilon type overhanging device 66 Suspension wheel 69 Connection frame 70 Towing movement device (traction and pressing device)
71 Car body with roller 72 Moving cross beam with car body 74 Car body 74 Screwed PC steel 75 Nut 77 Center hole jack 79 Screwed PC steel 80 Box girder PC bridge 81 Bolt / nut 82 New box girder block 83 Concrete 84 Upper floor formwork 85 Below Floor slab form 86 Threaded vertical PC steel 88 Suspension wheel type suspension support device 89 Suspension support device 90 Vertical PC steel material 91 for anchor block fixation Female thread metal fitting 92 with anchor 92 Chain block 93 Moving beam 94 Suspension support device 95 Connecting joint

Claims (7)

  In the pyrone-type overhanging device used when the web material or the frame material is stretched and supported on the PC bridge, the pyrone-type overhanging device includes a pyrone located at a tip portion of an existing overhanging block, a pyrone and an existing block A diagonal member on the existing side that connects the front end portion of the web material or frame material on the new side fixed so as to overhang the web material or frame material of the existing block, and a diagonal member on the new side that connects the pyrone A pyrone-type overhanging device characterized by comprising:   A detachable new anchor block is provided at the top end of the new web member or frame member, and the new web member or frame member and the diagonal member are connected via the new anchor block. The pyrone-type overhanging device according to claim 1.   A pulling and pressing device for pulling out the working scaffold supported by hanging on the new side front beam that is fixed to the new side anchor block to the new side is detachable on the new side web material or frame material. The pyrone overhanging device according to claim 1 or 2, wherein the pyrone type overhanging device is provided.   In the pyrone-type overhang construction method using the pyrone-type overhang construction device according to any one of claims 1 to 3, the pyrone is detachably fixed to the tip of the overhanging block on the existing side, and the end of the newly installed web material or frame material The unit is joined and integrated with the end of the web member or frame member of the existing overhanging block, and the other end side of the existing side slant member connected to one end side to the pyrone is detachably fixed to the rear side existing block. The other end of the other diagonal member connected to the pyrone is detachably connected to the tip of the new web member or frame member to support the new member web member or frame member. Then, a pyrone-type overhang construction method characterized by constructing a new-side extension block including a new-side web material or frame material.   Using the pulling and pressing device arranged on the upper side of the web material or the frame material, the work scaffold is moved forward, and then the end of the new diagonal member is moved to the front side of the new web material or frame material. The pyrone overhang construction method according to claim 4, wherein connection is made.   The pyrone-type overhang construction method according to claim 4 or 5, wherein the web material is a web material comprising a web material comprising a corrugated steel web or a frame material comprising a core material for a web material assembled from a steel material. .   The pyrone overhanging construction method according to any one of claims 4 to 6, wherein the pyrone can be transported and installed at the tip of the new bridge body by a traveling crane that moves on an existing overhanging block.

Images