JP2006028881A - Self-propelled pc floor slab erecting machine and pc floor slab erecting method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a self-propelled PC floor slab erecting machine which is mechanized so as to efficiently set PC floor slabs, and to provide a PC floor slab erecting method. <P>SOLUTION: According to the structure of the self-propelled PC floor slab erecting machine, a frame-type front leg 2 and a frame-type rear leg 3 are arranged in an intermediate area of a girder 1 across an interval, and upper portions of the frame-type front leg 2 and the frame-type rear leg 3 which are each provided with erecting machine elevating jacks 7, are fixed to the intermediate area. The girder 1 is provided with traveling rails 10, along which a traveling trolley having a hanging device 18 and a rotary section 17 hanging from a lower portion thereof, travels. Then one side supporting rail 24 and the other side supporting rail 24 overhang outward are provided on both left and right sides of the frame-type front leg 2 and the frame-type rear leg 3, and one side protective scaffold-cum-timbering device 34a extending along the one side support rails 24 and the other side protective scaffold-cum-timbering device 34 extending along the other side support rails 24 are arranged so as to enclose steel girders 37 in a manner capable of approaching/separating from each other. The PC floor slab erecting method is for use in efficiently erecting the PC floor slab by using the erecting machine. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a self-propelled PC slab erection machine and a PC slab erection method for laying a PC (precast concrete) slab on a girder such as a steel girder.

Conventionally, as a method of installing PC floor slabs on steel girders, PC floor slabs have been erected with a truck crane, or one by one using a small erection machine. (For example, see Patent Documents 1 and 2)
Japanese Patent Laid-Open No. 2003-74018 Japanese Patent Laid-Open No. 6-306819

In the conventional method, the installation work efficiency of the PC floor slab is poor, leading to a cost increase. In addition, when building a new line in an urban area, the use of existing roads around is often restricted, and at night, a limited space and a long time are required.
In addition, when there is a floor slab placed between the PC slabs, it was necessary to prepare the formwork, scaffolding, and curing equipment for that part separately.
When building floor slabs for bridges that are parallel or three-dimensionally intersecting with cities and streets in urban areas, in addition to installing protective scaffolding to ensure street safety, and to use heavy machinery for floor slab construction, There is a problem that will obstruct street traffic.

  The present invention can efficiently install a PC floor slab, and can reduce or widen the distance between opposing protective scaffolds in response to changes in the width of the floor slab, ensuring street safety and traffic. It is an object of the present invention to provide a mechanized PC slab erection machine and a PC slab erection method that require little obstruction.

  In order to solve the above-mentioned problem advantageously, in the self-propelled PC floor slab erection machine of the first invention, in the self-propelled PC floor slab erection machine in which the PC floor slab is erected on the beam, it is extended in the front-rear direction. A frame-type front leg and a frame-type rear leg that are open on the inner side of the frame are arranged at intervals in the middle part of the girder, and the upper parts of the frame-type front leg and the frame-type rear leg are fixed. The front leg and the frame type rear leg are provided with jacks for raising and lowering the construction machine, and the girder is provided with running rails extending in the front-rear direction so as to pass through the frame type front leg and the frame type rear leg, The traveling rail is provided with a traveling trolley having a swivel portion at a lower portion thereof so as to be able to travel, and a suspension device is provided at the swivel portion.

  Further, in the second invention, in the self-propelled PC floor slab erection machine according to the first invention, the one side support rail and the other side support projecting outward on the left and right sides of the frame type front leg and the frame type rear leg, respectively. A rail is provided, and a traverse trolley supported on each side support rail and a traverse trolley supported on each other side support rail. The other side protection scaffolding / supporting device provided across is configured so as to be movable toward and away from each other so as to surround the beam.

  Further, in the PC floor slab erection method of the third invention, the self-propelled PC floor slab erection machine of the first invention or the second invention is used to jack up the self-propelled PC slab erection machine. The front traveling wheel is lifted from the front rail, the front part of the front rail is moved forward and the rear end of the front rail is transported and moved under the front traveling wheel, and the front rail is laid on the girder. After laying the PC floor slab on the girders of the removed section, a new floor slab upper rail is provided on the PC floor slab so as to be connected to the existing floor slab upper rail, and then the front rail and the floor slab upper rail The process of moving the self-propelled PC floor slab erection machine to the section where the PC floor slab is erected next is repeated.

According to the self-propelled PC floor slab erection machine of the first invention, the upper part of each of the front and rear frame-type legs with the frame-type front leg and the frame-type rear leg opened inside the frame spaced apart from the middle part of the girder Can secure a space where the side of the frame-type front leg and the frame-type rear leg can be opened to turn the PC floor slab. Using the suspension device provided on the swivel of the traveling trolley that runs along, the PC floor slab that is short in the direction of the bridge axis and long in the direction perpendicular to the bridge axis faces the long side in the direction of the bridge axis, and the front and rear frame legs After being suspended and conveyed between the two, the PC floor slab can be easily rotated and rotated in the direction of the width of the bridge to be installed with its orientation corrected.
Therefore, without lifting the PC floor slab from the narrow lower side road on the side of the elevated girder, it does not become a side road on the side of the wide elevated girder or traffic that is less behind the self-propelled PC floor slab erection machine. The PC floor slab can be transported to the rear part of the self-propelled PC floor slab erection machine with a dolly from the span, and the PC floor slab can be easily installed on the steel girder by day and night. Since the PC floor slab can be transported and installed at a high place on the steel girder, the installation of the PC floor slab can be carried out efficiently in a short construction period and economically.

  According to the second invention, the self-propelled PC floor slab erection machine according to the present invention is such that the one-side protective scaffolding / supporting device and the other-side protective scaffolding / supporting device are close to each other so as to surround the steel girder. Because it is configured to move away from each other, depending on the interval between parallel steel girders (change in width of PC slab), one side protection scaffolding / supporting device and the other side protection scaffolding / supporting device It is possible to easily arrange the protective scaffold and the support work using the scaffold by approaching or leaving the platform, ensuring the safety of the street while ensuring the safety of the worker, and also including the scaffolding on the PC floor The entire plate laying machine can be mechanized.

According to the third invention, the self-propelled PC floor slab erection machine according to the first or second invention can be used to efficiently and easily lay a PC floor slab on a narrow beam, The self-propelled PC slab erection machine can be easily moved to the section on the girder where the PC slab is installed next.

  First, with reference to FIGS. 1-5, the structure of the self-propelled PC floor slab erection machine of one Embodiment of this invention is demonstrated.

  The steel truss girder 1 extending in the front-rear direction is set to be longer than the distance between two diameters, and the frame-type front leg 2 and the frame-type rear leg 3 are approximately one diameter in the middle of the truss girder 1 extending in the front-rear direction. The middle part of the upper horizontal bar 4 in the steel-shaped frame-shaped front leg 2 is fixed by welding or the like, and the steel-shaped frame-shaped rear leg. 3 is fixed, and each frame-type front leg 2 and frame-type rear leg 3 are formed into a steel-shaped frame-shaped frame, and the inside of the frame is an open space to carry the PC floor slab.・ Swivel or rail transport is possible. The frame-type front leg 2 and the frame-type rear leg 3 are arranged at least at intervals that allow the PC floor slab to turn.

  The lower part of each frame-type front leg 2 and frame-type rear leg 3 is provided with traveling wheels 5 spaced apart in the left-right direction, and a wheel support portion that holds the guides engages with the rail side surface. A roller 6 is provided (see FIG. 4), and a frame raising / lowering jack 7 is provided on each of the left and right sides of the frame-type front leg 2. In the illustrated embodiment, the traveling wheels 5 provided on the frame-type rear legs 3 travel on a floor slab upper rail 9 installed on a PC floor slab 8 installed, and are traveling wheels made of pneumatic rubber tires. It is set to 5. Further, the traveling wheels 5 provided on the frame-type front legs 2 are rubber wheels, and are configured to travel on the front rails 40 installed on the girders 37.

  Further, as shown in FIGS. 3 and 5, traveling rails 10 are provided on both the left and right sides of the truss girder 1 so as to extend in the front-rear direction substantially over the entire length of the truss girder 1. A self-propelled trolley 12 having traveling wheels 11 spaced from each other in the front-rear direction on both the front and rear sides of the upper part of the trolley frame is suspended and supported on the rail 10 so as to be able to travel in the front-rear direction. It can run over the entire length in the front-rear direction.

  One self-propelled trolley 12 is supported by the pair of traveling rails 10, and the dimensions of the self-propelled trolley 12 in the left-right direction are the left and right dimensions of each frame-type front leg 2 and frame-type rear leg 3. Therefore, one self-propelled trolley 12 is configured to be able to travel substantially over the entire length in the front-rear direction of the truss girder 1.

  An upper part of a swivel support base 15 is fixed to a lower part of the frame 14 of the traveling trolley 12, and a swivel base 17 having an annular external tooth 16 is supported on the lower part of the swivel support base 15 so as to be turnable. The annular outer teeth 16 that are swung by an omitted drive device are supported so as to be pivotable about the longitudinal center axis. For example, a driving gear fixed to an output shaft of a driving device (not shown) provided on the swivel support base 15 side is meshed with the annular external gear 16 so that the swivel base 17 can be rotated forward or backward. Has been.

  Self-propelled PC floor slab erection machine by means of the truss girder 1, each frame type front leg 2 and frame type rear leg 3 and their wheels 5, erection jack elevating jack 7, self-propelled trolley 12, suspension device 18, etc. 39 is configured.

  A suspension device 18 is provided below the swivel base 17. In the suspension device 18 of the illustrated form, the upper part (for example, the upper hook or the upper annular portion) of the electric chain block 20 is suspended and locked to the suspension rod 19 provided on the swivel base 17, and the electric chain block. 20 is configured to be turnable by turning of the turntable 17.

  Therefore, the electric chain block 20 is turned by the turning of the turntable 17, and the new PC floor slab 8 is supported by being suspended from the lower hook 21 of the link chain fed out from the electric chain block 20 via the suspension strip 22. Can be rotated at an appropriate angle such as 90 degrees.

  Because of this construction, the new PC floor slab 8 with a short width in the bridge axis direction and a long length in the direction perpendicular to the bridge axis is oriented with the long part in the direction perpendicular to the bridge axis directed in the bridge axis direction. In the state, it is transported to just below the traveling rail 10 of the truss girder 1 by the transport carriage 23 traveling on the existing floor slab upper rail 9, and the PC floor slab 8 on the transport carriage 23 is transferred to the self-propelled trolley 12. The PC floor slab 8 is lifted by the lower suspension device 18 and suspended and conveyed in the bridge axis direction in the posture state, and the PC floor slab 8 is positioned between the frame-type rear leg 3 and the frame-type front leg 2. By rotating the swivel base 17 by 90 degrees, the PC floor slab 8 can be rotated 90 degrees to a predetermined arrangement posture, and in that state, it can be conveyed to the installation position and suspended. Can be installed at a predetermined installation position.

  In addition, when the installation position of the PC floor slab 8 is a position near the center of the frame-type rear leg 3 and the frame-type front leg 2, the swivel base 17 is turned 90 degrees at that position and hung down to be predetermined. The position for turning the PC floor slab may be appropriately set between the frame-type rear leg 3 and the frame-type front leg 2 depending on the installation location.

  In the illustrated form, the distance between the left and right vertical frames 13 of the frame-type rear leg 3 is smaller than the dimension in the direction perpendicular to the bridge axis (left and right direction) of the PC floor slab 8 in the installed state, and the PC Since the size of the floor slab 8 in the bridge axis direction is shorter than the distance between the left and right vertical frames 13 of the frame-type rear leg 3, as described above, all the PC slabs 8 are turned 90 degrees. To install.

  At the bottom of each frame-type rear leg 3 and frame-type front leg 2, there are base end portions of one side support rail 24a and other side support rail 24b made of an H beam projecting laterally laterally outward. A transverse rail is formed by being fixed, and an intermediate portion of each one side support rail 24a and the other side support rail 24b and an intermediate portion of each vertical frame 13 are connected by an oblique material, The traverse rails of the side support rail 24a and the other side support rail 24b are supported.

  A self-propelled traversing trolley 25 is installed on each of the support rails 24 spaced apart in the left-right direction so as to be adjustable in the left-right direction. The upper part of the protective scaffold frame 27a extending substantially over one diameter in the front-rear direction over the outer lower part (outer lower part separated from the girder) of each frame 26 in the lateral and rear side trolleys 25 is fixed by welding or bolts. Of the protective scaffold frame 27b that is attached by means and extends substantially over one diameter in the front-rear direction over the outer lower portion (outer lower portion that is separated from the girder) of the front and rear trolley frames 26 on the other side in the left-right direction. The upper part is attached by fixing means such as welding or bolts.

  The bottom ends of the left and right protective scaffold frames 27a and 27b are respectively provided over the entire length of the protective scaffold frames 27a and 27b in the front-rear direction, and the base ends of the horizontal fixed scaffold plates 28 projecting inward toward the spar. The part is fixed. Although not shown, a vertical protection net 29 is stretched on the outer surface of the protective scaffold frame 27.

  The lateral adjustment of the self-propelled traversing trolley 25 is performed by temporarily fixing the traversing trolley frame 26 and one side support rail with a brake shoe attached to a traversing drive (not shown). (Or the other side support rail) 24 is provided with a hole in the traversing rail so that the position can be adjusted in the front-rear direction by a detachable position fixing bracket such as a pin, bolt or nut.

  A protective net support member 30 is pivotally attached to the lower part of each fixed scaffold plate 28 toward the spar side so that the turning position can be adjusted by a turning drive device 32 such as a rotary reactor about a longitudinal axis 31. It has been. A protective net 33a is stretched over and attached to each of the protective net support members 30 over the horizontal pivoting horizontal bar 38 of each protective net support member 30a on one side in the left-right direction. A protective net 33b is stretched and attached over each protective net support member 30 on the other side, and the protective nets 33a and 33b are supported by the protective net support members 30a (30b).

  One lateral support rail (transverse rail) 24a in the left-right direction, each traverse trolley 25, a protective scaffold frame 27a, a fixed scaffold plate 28, a protective net support member 30 and protective nets 29, 33a One protective scaffolding device that can be moved is constructed, and a supporting scaffold such as a telescopic column that can be tilted is attached to each fixed scaffolding plate 28 and the like, although not shown in the protective scaffolding device, and the protective scaffolding / supporting device 34a is formed, and the other side support rail (traversing rail) 24 on the other side in the left-right direction, each traversing trolley 25, the protective scaffold frame 27, the fixed scaffold plate 28, the protective net support member 30, and the protective net 29, 33 constitutes the other protective scaffolding device that can move in the left-right direction, and the protective scaffolding device is not shown in the figure but is attached to the scaffolding, such as a tiltable telescopic support. It has been protected scaffolding and shoring device 34b is configured. Although not shown in the figure, a detachable support such as a telescopic support is erected so as to be supported by the turning and swinging lever 38 in each of the protective scaffolding / supporting devices 34a and 34b. It can also be made to support.

Due to the configuration in which one and the other protective scaffolding / supporting devices 34a and 34b in the left and right direction are movable in the left and right direction, the distance between the beams 37 in the direction perpendicular to the bridge axis parallel to the bridge axis direction in the viaduct frame changes. Even if the projecting dimension of the cantilever support beam 35 projecting in the direction perpendicular to the bridge axis attached to the girder 37 is changed, it can be coped with. For example, when the distance between the steel girders parallel to the two rows on the bridge pier 36 is wide, as shown in FIG. As shown in FIG. 3, a protective scaffold may be formed so as to surround each side 37 and the entire side of the cantilevered support beam 35 and the entire lower side thereof. it can.
In this way, a self-propelled PC floor slab erection machine 39 having a protective scaffolding is configured.

  In addition, although illustration is abbreviate | omitted, the formwork board or curing equipment (illustration omitted) can be arrange | positioned and attached to the fixed scaffold board 28 to the self-propelled PC floor slab erection machine of the said embodiment. In this way, in the cast-in-place slab part at the end of the bridge axis direction where the PC floor slab 8 is not installed, the above-mentioned self-propelled PC floor slab erection machine is used to form a mold plate arranged in a direction perpendicular to the bridge axis. This is advantageous when cast-in-place concrete is cast in support and cured and cured to construct a cast-in-place slab.

  The distance between the frame-type rear leg 3 and the frame-type front leg 2 is approximately the same length as the length, and the length of the front rail 40 is also approximately the same.

  Next, with reference to FIG. 1 and FIGS. 6-8, the method of erection construction of PC floor slabs on the parallel girder 37 using the mobile erection machine of this invention is demonstrated.

  First, in the state of FIG. 1 and FIG. 6, a large number of PC floor slabs 8 are arranged side by side across the parallel girders 37 in the direction perpendicular to the bridge axis and have PC steel material insertion holes in the bridge axis direction. PC steel is inserted into the plate 8 in the direction of the bridge axis, the joint mortar is filled and hardened between the upper parts of the PC floor slab 8, and the PC steel is tensioned and fixed and integrated on the existing PC floor slab 8a. Rails (floor slab upper rails) 9 are installed, and wheels 5 equipped with rubber tires in the frame-type rear legs 3 of the self-propelled erection machine 39 of the present invention are placed on the slab upper rails 9 in the direction of the bridge axis. The front rail 40 (the rail with the receiving bracket 47) between which the PC floor slab 8 is to be newly installed is removed, and the front rail 40 is removed. Is moved on the steel girder 37 between the spans on the new side, Front wheel 5 of the frame type Zenbuashi 2 in the self-propelled construction machine 39 on the front rail 40 of a state of being placed.

  In the state shown in FIG. 6, the PC floor slab 8 is transported directly below the rear portion of the self-propelled erection machine 39 by the transport carriage 23 from the rear moving on the floor slab upper rail 9, and then to the self-propelled erection machine 39. The newly installed PC floor slab 8 is lifted by the attached suspension device 18 that can be transported in the bridge axis direction, and is transported to the bridge axis direction new installation side. The step of placing the PC floor slab 8 on the transport carriage 23 is not shown in the figure, but the side between the steel legs before the erection of the rear girder and the erection of the rear side is relatively small. A mobile crane is placed on a road such as a road, and is lifted and placed by the mobile crane.

  Since the PC floor slab 8 is transported in the direction perpendicular to the bridge axis in the direction of the bridge axis, the suspension device 18 is placed at an appropriate position between the frame-type front leg 2 and the frame-type rear leg 3. The PC floor slab is rotated 90 degrees so that the PC floor slab is rotated to a predetermined orientation. In this state, the PC floor slab is transported adjacent to the existing PC floor slab 8 and suspended on the girder 37. To do.

  The PC floor slab 8 transfer and installation process is repeated as many times as necessary, and a large number of PC floor slabs 8 are transferred and installed at predetermined positions as shown in FIG. The PC floor slab 8 and the steel girder 37 are integrated by filling a mortar with a stud bolt 52 fixed to the steel girder 37 positioned in a rectangular through-hole penetrating up and down the PC floor slab 8.

  As shown in FIG. 8, after a predetermined number of PC floor slabs 8 are installed near or on the next pier 36, as shown in FIG. The sheath is disposed so that the insertion holes communicate with each other, the joint portion is filled with the non-shrink mortar 42 and hardened, and then the PC steel material 44 is crossed over the PC steel material insertion holes 43 in the bridge axis direction of the PC floor slabs 8. Is inserted and arranged, and the end of each PC steel material 44 is tension-fixed to the end of the end PC floor slab 8 (see FIG. 11B), and each PC floor slab 8 is integrated. (See FIGS. 11a-c)

  The PC floor slab 8 at the end is overlaid with an embedded connecting rebar 45 for integration with the floor slab 44 made of cast-in-place concrete, integrated with the floor slab 44 made of cast-in-place concrete, and the existing floor slab 8a. Build up. (See FIG. 11b)

  If necessary, the formwork (not shown) for placing concrete (or non-shrink mortar) on the place-to-place slab at the end of the PC slab and the adjustment joint between the PC slabs is omitted from the truss. Placing the assembled concrete (or non-shrink mortar) using the suspended scaffolding and curing device.

  Next, the frame raising / lowering jack 7 of the frame-type rear leg 3 in the self-propelled PC floor slab erection machine 39 or the frame raising / lowering jack 7 of the front and rear frame-type legs 2, 3 is extended and seated on the steel girder 37. And further extended to jack up the rear part or the whole of the self-propelled PC slab erection machine 39. When the self-propelled PC floor slab erection machine 39 is moved forward in the direction of the bridge axis, the protective scaffold device 34 and the turning and turning reed 38 and the protective net 33 attached thereto do not interfere with the pier 36 and the like. Then, move backward as appropriate.

  In this state, in a state where the wheel 5 attached to the frame-type rear leg 3 is floating near the end of the existing floor slab upper rail 9, it is connected to the end of the existing floor slab upper rail 9. A new floor slab upper rail 9 in which a pair of parallel rails are assembled in a ladder shape or the like is installed on a PC floor slab 8 integrated in the bridge axis direction.

  In order to construct the above-described newly installed floor slab upper rail 9, the rail 7 on the floor slab is transported to the rear part of the PC floor slab erection machine 39 by the rear transport carriage 23, and is lifted and transported by the electric chain block 20. It may be installed on the newly installed PC floor slab 8.

  The length of the newly installed floor slab upper rail 9 is approximately equal to the distance between the centers of the front and rear frame-type legs 2 and 3 in the self-propelled PC floor slab erection machine 39 (in the illustrated case). It is desirable that the length is equal to the length of one span because only one installation work is required. The floor slab upper rail 9 is appropriately fixed to the PC floor slab 8 by a detachable fixing means. For example, an anchor hole is drilled in the PC floor slab 8, an internal thread insert is embedded, and the floor slab upper rail 9 is bolted or the like. Fix the bottom of the.

  After laying the floor slab upper rail 9 on the newly installed PC slab 8 as described above, the laying machine lifting jack 7 is shortened and the wheels 5 of the PC floor slab erection machine 39 are placed on the floor slab upper rail 9. In this state, the wheel 5 attached to the frame type rear leg 3 of the PC floor slab erection machine 39 and the frame type front leg 2 are attached to the newly installed floor slab upper rail 9 and the front rail 40, respectively. The PC floor slab erection machine 39 is moved forward to a new section for approximately one span in which the PC floor slab 8 is newly installed so as to roll the wheels 5. The front rail 40 is supported by a steel beam 37 and the like via a steel bracket 47 having a T-shaped cross section. The front rail 40 is detachably attached to the receiving bracket 47 with bolts 48, and the receiving bracket 47 is fixed to the steel girders 37 and the like by appropriate means such as bolts. The receiving bracket 47 is supported via the receiving bracket 47 so that the stud rails 52 in the two bridge axial directions fixed on the steel girders 37 and the front rail 40 do not interfere with each other. A groove 53 for receiving the head of 52 is provided.

  If the front rail 40 is removed in this state, the PC floor slab 8 can be newly installed on the steel girder 37 in that section, so that the rail suspended by the transport carriage 23 is conveyed to the rear part of the PC floor slab erection machine. The lowering jig 49 is suspended and conveyed by the electric chain block 20 so as to be positioned between the frame-type front leg 2 and the frame-type rear leg 3, and the receiving bracket 47 is removed from the steel beam 37 and the front rail 40. After connecting the connecting bracket 50 of the rail hanging jig 49 to the frame-type front leg 2 in the self-propelled PC floor slab laying machine 39, the frame raising / lowering jack 7 of the frame type front leg 2 or the front and rear frame type legs 2 and 3 The construction machine elevating jack 7 is extended and seated on the steel girder 37 and further extended to jack up the front part or the whole of the self-propelled PC floor siding construction machine 39. In addition, it is efficient if the front rail 40 is transported and installed in a state where a pair of parallel rails are assembled in a ladder shape or the like.

  In this state, since the wheel 5 attached to the frame-type front leg 2 is floating near the front end portion of the front rail 40, the self-propelled trolley 12 is moved forward so that the rail suspension treatment is performed. The tool 49 and the front rail 40 with the bracket are suspended and moved to the front section, and the rear end of the front rail 40 is suspended and lowered so as to be inserted under the wheel at the lower part of the frame type front leg. Then, after attaching the receiving bracket 47 to the steel girder 37 or the like with a bolt or the like, the construction machine elevating jack 7 is driven to be shortened, and the self-propelled PC floor slab erection machine 39 is placed on the front rail 40. The rail hanging jig 49 is transported to an appropriate rear position by the electric chain block 20 and the transport carriage 23.

  After that, the protective scaffold device 34, the turning swivel pad 38 and the protection net 33 attached thereto are moved forward and swiveled in the direction perpendicular to the bridge axis and installed at a predetermined position, and in parallel as described above. The PC floor slab 8 is installed in the bridge axis direction on the steel girder 37.

  Such a process is repeated as many times as necessary to construct the PC floor slab 8 in the direction of the bridge axis on the steel girder 37 and to construct the cast-in-place slab at the end.

The construction procedure of the PC floor slab using the above-mentioned PC floor slab erection machine is simply described as follows.
(1) The PC floor slab 8 is placed on the transport carriage 23 by a mobile crane from the ground.
(2) The transport carriage 23 on which the PC floor slab 8 is placed is moved to the self-propelled construction machine 39.
(3) The PC floor slab 8 is lifted, moved, swiveled and suspended and lowered by the traveling trolley attached to the self-propelled erection machine 39 and the electric chain block suspended below the traveling trolley.
(4) Repeat steps (1) to (3) to install the required number of PC floor slabs 8 on the girders 37.
(5) After the self-propelled erection machine 39 is jacked up by the lifting jack 7, the floor slab upper rail 9 is placed on the PC floor slab 8 using the electric chain block 20 with a trolley.
(6) The lifting jack 7 is shortened, and the self-propelled erection machine 39 is moved down in the erection progressing direction after being jacked down.
(7) After elevating the lifting jack 7 in the self-propelled erection machine 39 and jacking up, the electric rail block 20 with a trolley lifts the front rail 40 scheduled to be placed on the PC floor slab and moves it forward to the next diameter. The front rail 40 is laid in between.
(8) The operations (1) to (7) are repeated.

  As described above, when the mobile erection machine 39 of the present invention is used, even when the road (side road 51) below the elevated girder 37 is narrow, a mobile crane (not shown) is placed on the road near the mobile erection machine 39. The PC floor slab 8 can be efficiently installed on the elevated girder 37 without arranging the above.

  When implementing this invention, it is good to set it as the construction machine which has arrange | positioned the frame type front part leg 2 and the frame type rear leg 3 so that it may fit between pier center (between fulcrum).

  In the above embodiment, since each protective scaffolding / supporting device has a length corresponding to one span, the protective scaffolding / supporting device can be surely installed between the piers only by moving the PC slab erection machine. It can be easily configured.

  Further, in the above-described embodiment, the protective net support member provided with the pivoting recumbent that can be rotated to protrude from the fixed scaffolding plate or retreat at the lower end of the inner side of the fixed scaffolding plate in each protective scaffolding / supporting device. The protective net can be rotated and retracted so that the protective net can be unfolded or folded to the retracted position simply by providing the protective net.

  Further, in the above-described embodiment, the protective net can be expanded and retracted only by turning the protective net support member by a predetermined angle. Therefore, in the section where the steel girder width between the piers is narrow, the underside It can be deployed so as to wrap the whole, or in a section with a wide steel girder width between piers, it can be deployed so as to surround the underside of the girder. The outside can be passed.

It is a schematic side view which shows the state which is using the self-propelled PC floor slab erection machine of one Embodiment of this invention on an elevated girder. It is a side view which expands and shows a part of FIG. It is the sectional view on the AA line of FIG. (A) is a schematic front view which shows the relationship between the cradle provided on a steel girder, a front part side rail, and a traveling wheel, (b) is a partially vertical side view. It is a partial longitudinal cross-sectional front view which shows the state which moved each trolley for trolleys and a protective scaffold apparatus to the outer side when the width | variety is wide. It is a schematic side view which shows the arrangement | positioning state of each apparatus in the case of constructing a PC floor slab on a steel girder using a self-propelled PC floor slab erection machine. It is a schematic side view which shows the state which built the PC floor slab on the steel girder using the self-propelled PC floor slab erection machine. It is a schematic side view showing a state immediately before jacking up a self-propelled PC floor slab erection machine and suspending and conveying the front rail to the next span side. It is a schematic plan view which shows an example of the arrangement | positioning form of the PC floor slab of a bridge axis direction, and the arrangement | positioning form of a place-placed slab part. It is a schematic plan view which expands and shows a part of PC floor slab part in FIG. (A) is a longitudinal side view showing a state in which PC steel materials are inserted and arranged between PC floor slab joints and PC floor slabs, and (b) is a connection between the PC floor slab and the cast-in-place slab. FIG. 4C is a longitudinal side view showing a structure when a PC steel material is fixed by a PC floor slab in an intermediate part in the bridge axis direction. (A) And (b) is a front view which shows the example of the PC floor slab which has PC steel material penetration hole, respectively.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Steel truss girder 2 Frame type front leg 3 Frame type rear leg 4 Upper side rail 5 Traveling wheel 6 Guide roller 7 Construction machine raising / lowering jack 8 Built-in PC floor slab 9 Floor slab upper rail 10 Traveling rail 11 Travel Wheel 12 Self-propelled trolley 13 Vertical frame 14 Traveling trolley frame 15 Swivel support base 16 Annular external teeth 17 Swivel base 18 Suspension device 19 Suspension rod 20 Electric chain block 21 Lower hook 22 Suspension strip 23 Transport carriage 24a One side Part support rail (traverse rail)
24b Support rail on the other side (rail for traversing)
25 Traversing trolley 26 Traversing trolley frame 27a Protective scaffold frame 27b Protective scaffold frame 28 Fixed scaffold plate 29 Vertical protective net 30 Protective net support member 31 Vertical axis 32 Rotating drive 33a Protective net 33b Protective net 34a Protective Scaffolding / supporting device 34b Protective scaffolding / supporting device 35 Support beam 36 Bridge pier 37 Girder 39 Self-propelled erection machine 40 Front rail 41 Joint part 42 Non-shrink mortar 43 PC steel material insertion hole 44 Cast-in-place slab 45 Embedded connecting reinforcing bar 46 Jack for elevating machine 47 Receptacle bracket 48 Bolt 49 Rail hanging bracket 50 Connecting bracket 51 Side road 52 Stud bolt 53 Groove 54 Through hole

Claims (3)

  In a self-propelled PC floor slab erection machine that lays a PC floor slab on a girder, a frame-type front leg and a frame-type rear leg that are open inside the frame are spaced apart from the middle part of the girder that extends in the front-rear direction. The upper part of the frame type front leg and the frame type rear leg are fixed, the frame type front leg and the frame type rear leg have jacks for raising and lowering the construction machine, and the girder extends in the front-rear direction. A traveling rail is provided so as to pass through the frame-type front leg and the frame-type rear leg. A self-propelled PC floor slab erection machine characterized in that a suspension device is provided.   One side support rail and the other side support rail that protrude outward are provided on the left and right sides of the frame type front leg and the frame type rear leg, respectively, and cross over the traversing trolley supported by each one side support rail. 1 side protection scaffolding / supporting device provided on the other side and the other side protection scaffolding / supporting device provided across the traversing trolley supported by each other side support rail surround the girder The self-propelled PC floor slab erection machine according to claim 1, wherein the self-propelled PC floor slab erection machine is configured to be movable toward and away from each other.   Using the self-propelled PC floor slab erection machine according to claim 1 or claim 2, the self-propelled PC floor slab erection machine is jacked up to lift the front traveling wheel from the front rail. After moving the front part forward and the rear end of the front rail under the front traveling wheel and laying it on the girders, laying the PC floor slab on the girders in the section where the front rails were removed, A new floor slab upper rail is provided on the PC floor slab so as to be connected to an existing floor slab upper rail, and then a self-propelled PC floor slab erection machine is next utilized using the front rail and the floor slab upper rail. A PC floor slab erection method characterized by repeating the process of moving the PC slab to the section where it is erected.

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