JP2000087315A - Method and device for construction of floor slab - Google Patents

Abstract

PROBLEM TO BE SOLVED: To construct safely and efficiently a floor slab in a high accuracy. SOLUTION: A floor slab is constructed by placing concrete through a center form 18 and a wing form 22. The wing form 22 is arranged so as to be vertically movable and to be detachable on a scaffold 40 extended down from a gantry crane 38 arranged on the main girders of both sides of bridge girders 14 and the constructing slab to freely move the wing form 22 back and forth together with the transfer of the gantry crane 38. The wing form 22 is fixed by a fixing tool 52 constituted of a lateral beam 54 of the rear face of the wing form 22 and an expansible jack 56 pivoted to the basal end of the lateral beam 54.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method and an apparatus for constructing a concrete slab on a bridge girder composed of at least two main girders and arranged between a plurality of, for example, three or more pier diameters. It is about.

[0002]

2. Description of the Related Art Originally, concrete slabs constructed on bridge girders connecting a plurality of bridge pier spans include an intermediate slab located between the main girders on both sides of the bridge girders and a concrete slab located outside the main girders of the bridge girders. The construction method consists of an intermediate slab formwork movably disposed on the cross beam of the bridge girder and a scaffold movably disposed along the main girder on both sides of the bridge girder. It is common practice to place a reinforcing material such as a reinforcing bar in both forms via the upper side slab form, and then to cast concrete.

In addition, the reinforcing material has been moved into the formwork from above the pre-constructed floor slab, on the bridge girder before the construction of the slab, or below the construction part.

[0004] Further, since the side floor slab formwork is supported by a building frame and a pipe column separate from the moving mechanism during concrete casting, the building frame and the pipe column are arranged on the main girder. Pre-assembled on a scaffold that hangs on the side of the gantry that was set up, fixed to the main girder and side slab formwork, and suspended the side slab formwork from above the gantry with a hanging tool such as a turnbuckle. At the time of concrete placement and removal of the formwork after concrete placement, disassemble the building frame, pipe supports, and hanging tools, transfer them to the scaffold, and move the gantry to which the scaffold is connected. It was moved to the construction location.

[0005] Further, there is no work scaffold that can be moved between the cross beams located at the lower part of the intermediate floor slab formwork.

[0006] In addition, the continuous slab construction of a plurality of bridge pier spans has been constructed sequentially from both ends in the longitudinal direction of the bridge toward the center or from one end to the other end in the longitudinal direction of the bridge.

[0007]

Conventionally, as described above, the arrangement of the reinforcing material in each formwork is performed by moving the reinforcing material into the formwork from on the pre-constructed floor slab, on the bridge girder, or below the construction portion. Therefore, there has been a problem that the surface of the pre-constructed floor slab is soiled or damaged.

[0008] Further, since the supporting of the side floor slab form at the time of concrete casting is performed by a building frame, a pipe support, or the like, these members are hung down on the side of the gantry arranged on the main girder. It is necessary to assemble, disassemble, and move on a scaffold that is not good, and the workability is not good, and the size of the device is large.

Also, since the formwork on the building frame and the pipe support had to have a fixing mechanism formed on the main girder, this fixing mechanism penetrated the cast concrete floor slab or exposed to the surface of the floor slab. Not only requires repair work,
There has been a problem that the strength of the main girder and the floor slab is reduced and the appearance is impaired.

[0010] Further, since the scaffold suspended from the gantry is used to support the side slab formwork, it is not possible to move the scaffold together with the gantry to another location when constructing the side slab and work. However, not only the workability is not good, but also the construction period is significantly delayed.

In addition, the continuous slab construction of a plurality of bridge pier spans is performed from both ends in the longitudinal direction of the bridge toward the center or from one end to the other end in the longitudinal direction of the bridge. Since the middle part of each pier is constructed after the pier part, the bridge girder between the piers is easily bent, causing a decrease in strength.

The present invention has been made in view of the above-mentioned drawbacks, and has as its object to provide a method and apparatus capable of constructing a floor slab safely, efficiently, and with high precision.

[0013]

SUMMARY OF THE INVENTION The present invention relates to a method of constructing a floor slab by placing concrete through a center formwork and a wing formwork. The wing form is freely movable up and down and detachably mounted on a scaffold suspended from the gantry installed in the gantry. When placing concrete in the formwork, the crossbeam of the fixing tool consisting of a telescopic cross beam fixed to the back of the wing formwork and a telescopic jack pivotally supported on the outer base end of the wing formwork of the crossbeam. The main girder end is pivotally supported at the upper corner of the main girder, and the lower end of the telescopic jack is brought into contact with the lower edge of the main girder to fix the wing formwork. The over mold bottom, in crossbeam below the bridge girder,
And the work scaffolding located between the main girders on both sides is suspended via a pair of suspension members arranged detachably and at predetermined intervals in the front-rear direction on the front and rear sides on the left and right sides of the center form back. When the cross beams of the suspension members approach the cross beam associated with the movement of the center formwork, the cross beam contact side of each pair of suspension members is removed, and the pair of suspension members is supported and moved by the other suspension member of each pair. After the members have passed the cross beam, the suspension members are suspended again on the center formwork, the other cross beam abutment side of each pair of suspension members is removed, and after passing the cross beams, the suspension members are again re-centered. Move the work scaffold by hanging it on the frame, or move the reinforcing material such as reinforcing steel used for building the floor slab to the gantry movably arranged on the main girder on both sides of the bridge girder Moving mechanism and movable up and down The rails to be arranged on the main girder on both sides of the bridge girder for moving the gantry, or on the building floor slab, are composed of a long rail material and a short rail material. The lower side of the both ends of the long rail material is swelled outward to form a trapezoidal shape, and the upper ends of both ends of the short rail material in the length direction are swelled outward to form an inverted trapezoidal shape. After being arranged adjacently,
By inserting short rail members between the long rail members, the respective rail members are connected, and when moving, disassembling and moving by removing the short rail members first, or By continuously constructing a plurality of bridge pier spans from the middle part of each pier to the pier, the deflection of the bridge girder between the piers is suppressed.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION A floor slab construction apparatus according to the present invention includes a horizontal girder 16 in a width direction of a bridge girder 14 arranged between upper portions of a pier 12.
A center formwork 18 is provided so as to be movable in the front-back direction of the bridge and can move up and down, and is movable in the front-rear direction of the bridge along the main girder 20 on both sides in the longitudinal direction of the bridge girder 14 and can move up and down. It is composed of both wing forms 22, 22 freely arranged, and the structure thereof will be described in detail below as shown in FIGS.

In this embodiment, the bridge girder 14 is formed of a steel material and is disposed between two adjacent piers 12 (diameters) or between three or more piers 12 (diameters). Reference numeral 20 denotes two bridge girders provided on both sides in the length direction.

The center formwork 18 is provided on a beam 24 movably laid on the cross beam 16 so as to be movable up and down.

In this embodiment, the center form 18 is moved by fixing one end of the wire 26 to the main girder 20 or the horizontal girder 16 and fixing the other end of the wire 26 to a winch 28 mounted on the beam 24. This is performed by winding the winch 28 and sliding the beam 24 with respect to the cross beam 16.

The lifting means for the center form 18 is
4 is a lifting jack 30 installed in the apparatus.

At the lower part of the center formwork 18, the work scaffold 3 located below the cross beam 16 of the bridge beam 14 and between the main beams 20 on both sides.
2 are supported via a pair of suspension members 34 (34a, 34b), which are detachably attached to the front and rear four places on the left and right sides of the center formwork 18 at predetermined intervals in the front and rear direction, respectively. I have.

The wing formwork 22 is suspended on a gantry 38 movably disposed on the main girder 20 on either side of the bridge girder 14 or on the building floor slab 36, and a lifting / lowering means 42 is provided.
It is provided so as to be able to move up and down and to be detachable via the.

The lifting / lowering means 42 for moving the wing formwork 22 will be described in more detail. As shown in FIGS. 1 and 3, the wing formwork 22 is detachably mounted between the lower part of the scaffold 40 and both ends in the width direction of the wing formwork 22. First and second telescopic jacks 44, 46
And a third telescopic jack 48 detachably mounted between a side portion of the scaffold 40 and an outer widthwise end of the wing form 22.
And 4 are individually adjusted from the floor slab construction position to the scaffold 4
After the wing form 22 is positioned on the scaffold 40 and then the gantry 38 is moved, the wing form 22 is movable in the front-rear direction of the bridge.

A fixture 52 for supporting and fixing the wing formwork 22 during construction of the floor slab is shown in FIG. 3, the structure of which includes a stretchable cross beam 54 fixed to the back surface of the wing formwork 22, A telescopic jack 56 pivotally supported at a base end of the cross beam 54 on the outer side (right side in FIG. 3) of the wing formwork 22, and a tip of the cross beam 54 on the main girder 20 side (left side in FIG. 3) is main girder. Along with supporting the upper corner of 20,
The lower end of the telescopic jack 56 is brought into contact with the lower edge of the main girder 20 to form a triangular structure, and the wing form 22 is supported at three points.

A moving mechanism 60 for moving a reinforcing member 58 such as a reinforcing bar used when constructing a floor slab to the gantry 38.
Are movably and vertically movable.

In this example, the moving mechanism 60 is an electric trolley and an electric chain block.

The rails provided on the main girder 20 or the building floor slab 36 on both sides of the bridge girder 14 for moving the gantry 38 include a long rail member 62 and a short rail member 64.
The lower rails 62 are formed in a trapezoidal shape by bulging the lower sides of both ends in the length direction of the long rails 62 outward.
4, the upper ends of both ends in the length direction are bulged outward to form an inverted trapezoid, and the long rail members 62 are arranged adjacent to each other, and then the short rail members 64 are fitted between the long rail members 62. By doing so, the rail members 62 and 64 are connected.

When the rail is moved, both the long rail member 62 and the short rail member 64 are trapezoidal.
The connecting surface between the rail members 62 and 64 is not a vertical plane but an inclined surface, and the short rail 64 can be easily dismantled and moved by removing the short rail 64 first.

In the drawing, reference numeral 66 denotes a support jack for supporting the center form 18; 68, a drive roller of the gantry 38; 70, a position adjusting mechanism of the center form 18;
2 is a safety device such as a chain detachably mounted to prevent the work scaffold 32 from dropping from the center formwork 18;
Reference numeral 4 denotes a finisher for moving the gantry 38 and leveling a concrete casting surface suspended vertically.
Is a packing material interposed between the bridge girder 14 and the rail, 7
8 indicates concrete.

A method of constructing a concrete slab using the slab constructing apparatus according to the present invention will be described in detail below.

First, the center formwork 18 and the wing formwork 22 are moved to the slab construction position of the bridge girder 14 (span (intermediate) portion of each pier 12; reference numeral 1 in FIG. 4) (operation step 1).

At this time, the center form 18 is
The wire 26 fixed to the horizontal girder 16 or the main girder 20 is moved up by moving the
2 is moved by driving the drive roller 38 of the gantry 38.

Since the work scaffold 32 suspended from the center form 18 via the suspension member 34 needs to pass through the bridge girder 14, when the suspension member 34 approaches the cross beam 16, each pair of suspension members 34 Cross girder abutment side (hinders movement) 34
a of the pair, and moved by being supported at four points by the other suspension member 34b of each pair.
6, the suspension member 34a is again suspended from the center formwork 18, the other cross beam contact side 34b of each pair of suspension members 34 is removed and moved, and after passing through the cross beam 16, The work scaffold 32 is moved by suspending the suspension member 34b on the center formwork 18 (see FIG. 5).

Therefore, since the work scaffold 32 is always suspended below the center formwork 18, the work efficiency can be improved.

Further, each wing form 22 has first to third
Ascending / descending moving means 4 composed of telescopic jacks 44, 46, 48
2, the position can be adjusted, and even when the lengths of both ends of the slab are different, it can be easily adjusted.

Next, the center form 18 is moved up and down the jack 3.
0, and the wing form 22 is raised to a predetermined position via the lifting / lowering means 42 (operation process 2: see FIGS. 1 to 3).

At this time, the two forms 18 and 22 are moved so that the end of the pre-constructed floor slab and the ends of the center form 18 and the wing form 22 overlap each other.
8 is adjusted by the position adjusting mechanism 70, and the wing form 22 is adjusted by the lifting / lowering moving means 42.

Next, a reinforcing member 58 such as a reinforcing bar is disposed in the center formwork 18 and the wing formwork 22 via a moving mechanism 60 mounted on the gantry 38 (operation step 3).

At this time, the reinforcing members 58 are loaded in advance from the ground side at both ends of the bridge, and are laid on the main girder 20 of the bridge girder 14 or on the already built floor slab (the long rail member 62 and the short rail member 62). By moving the gantry 38 on the member 64) via the drive roller 68, the reinforcing member 58 is supported by the moving mechanism 60 and moved to a predetermined position.

Next, the center form 18 is supported by the support jack 6.
6 and supported and fixed, and both wing forms 22
Is supported and fixed by supporting the front end of the cross beam 54 of the fixing tool 52 on the main girder side at the upper corner portion of the main girder 20 and attaching the lower end of the extendable jack 56 to the lower edge of the main girder 20 ( Working process 4).

At this time, the fixing tool 52 for supporting and fixing the two wing form frames 22 has a horizontal beam 54 and a telescopic jack 62 which are extendable and contractible. By adjusting the lengths of the extension 54 and the extendable jack 56, the length can be easily changed, and the workability is good.

When the wing form 22 is supported and fixed by the fixing tool 52, the lifting / lowering moving means 42 of the wing form 22
By removing the gantry 38 from the wing formwork 22, the gantry 38 can be moved together with the scaffold 40 to another work place, and the workability is good.

Further, in supporting and fixing the wing form 22, the fixing tool 52 including the cross beam 54 and the expansion / contraction jack 56 does not require any fixing mechanism to be formed on the main girder 20. No repair work is required, and the strength of the main girder 20 and the floor slab 36 is not reduced and the appearance is not impaired.

Further, the work scaffold 32 suspended from the center form 18 via the suspension member 34 removes the lateral beam contacting sides 34a, 34b of the pair of suspension members 34, respectively, and suspends the bridge beam to form a bridge girder. Since the work 14 can pass through the cross beam 16, the work scaffold 32 can always be formed below the center formwork 18, and workability can be improved.

Next, concrete 78 is poured into the center formwork 18 and both wing formworks 22 (work step 5).

Next, the concrete surfaces cast into the center formwork 18 and both wing formworks 22 are leveled by the finisher 74 (operation step 6: see FIGS. 6 and 7).

For the movement of the finisher 74, it is desirable to use the rails (long rail member 62 and short rail member 64) arranged on the pre-constructed floor slab or on the main girder 20 of the bridge girder 14. An electric trolley and an electric chain block similar to the moving mechanism 60 of the reinforcing member 58 of 38 may be used.

Thereafter, the center formwork 18 and the two wing formworks 22 are removed from the mold to construct the floor slab 36.

Thereafter, the center formwork 18 and both wing forms 22 are moved to the next floor slab construction position (reference numeral 2 in FIG. 4), and the floor slab 36 is constructed.

At this time, the fixing tool 52 for supporting and fixing the wing formwork 22 releases the pivot between the tip of the cross beam 54 and the upper corner of the main girder 20 and shortens the extendable jack 56. The horizontal beam 54 and the expansion jack 56 can be moved together with the wing form 22 while being suspended by the wing form 22. Assembling, dismantling,
There is no moving and fixing work, and workability is good.

Further, since the gantry 38 is moved via a rail composed of a trapezoidal long rail member 62 and a short rail member 64, the connecting surface of each rail member 62, 64 is not a vertical plane, but Because of the inclined surface, the disassembly and connection of the rail members 62 and 64 accompanying the movement of the gantry 38 are facilitated, the movement lane of the gantry 38 can be easily secured, and the movement of the gantry 38 can be performed extremely easily. (See FIG. 8).

As described above, the floor slabs are constructed sequentially from the span (intermediate) portion of each pier 12 toward the pier 12 (construction of the slabs in the order of reference numerals 1 to 9 in FIG. 4). After placing a heavy object on the center of the beam supporting both ends, utilizing the effect of suppressing the deflection of the beam played when the heavy object is placed on both ends of the beam, The deflection of the bridge girder 14 between the piers 12 can be suppressed.

By repeating this operation sequentially,
A concrete floor slab 36 can be constructed on the bridge girder 14.

FIGS. 9 and 10 show another example of the present invention.

In this example, a floor slab is constructed on a bridge girder 14 having a long distance between the main girders 20 on both sides of the bridge girder 12 or on a bridge girder 14 on which three or more main girders 20 are arranged. Digit 1
Except that the center formwork 18 is juxtaposed on the horizontal girder 6 or on each horizontal girder 16 divided by three or more main girders 20, the description is omitted.

In this embodiment, the bridge girder 14 is formed of a steel material. However, it is obvious that the bridge girder 14 is formed of a concrete material or another material.

The moving means and the elevating means of the center form 18 are the beam 24, the wire 26, the winch 28
And the lifting / lowering jack 30, but any other movable mechanism and a vertically movable mechanism may be used.

The suspension member 3 for suspending the work scaffold 32
4, a fixture 5 for supporting and fixing the wing formwork 22
The number of 2 can be freely changed according to the situation.

It is obvious that the gantry 38 can be moved up and down and the height can be adjusted.

[0058]

According to the method and apparatus for constructing a floor slab according to the present invention, a stretchable cross beam fixed to the back surface of a wing form, and a telescopic jack pivotally supported on the outer base end of the wing form of the cross beam. Supporting and fixing the wing formwork by supporting the top end of the main girder side of the cross beam of the fixture consisting of and the upper girder of the main girder, and attaching the lower end of the telescopic jack to the lower edge of the main girder Therefore, after supporting and fixing, the wing form can be separated from the gantry, so that the gantry can be moved to another work place for work, and workability is extremely good.

After the floor slab is constructed, the wing form is moved together with the fixture to the scaffold side of the gantry.
Since the fixture can be moved together with the wing form while being hung on the wing form, assembling, dismantling, etc. of the conventional wing form fixtures such as building frames, pipe columns, and hanging parts. There is no moving and fixing work, and workability is improved.

Further, in supporting and fixing the wing formwork, the fixing tool including the cross beam and the expansion / contraction jack can be supported and fixed to the main girder without forming any fixing mechanism on the concrete slab. Therefore, the strength of the main girder and the floor slab is not reduced, and the appearance is not impaired.

In the fixing device for supporting and fixing the wing formwork, since the cross beam and the expansion / contraction jack are respectively extendable and contractible, the length of the cross beam and the expansion / contraction jack is adjusted in accordance with the length of the slab on the wing side. By adjusting, it can be easily changed and workability is good.

Further, a work scaffold is hung below the center form via a pair of suspension members which are detachably mounted on the left and right sides of the back side of the center form at predetermined intervals in the front-rear direction. By doing so, when the cross members of the suspension members are close to each other, the cross beam contact side of each pair of suspension members is removed, and the pair of suspension members is supported and moved by the other suspension member of each pair. After passing, this suspension member is suspended again on the center formwork, and the other cross beam contact side of each pair of suspension members is removed and moved, and after passing the cross beam, this suspension member is again attached to the center formwork. By suspending and moving the work scaffold, the work scaffold is always formed below the center formwork, so that work efficiency can be improved.

A moving mechanism for moving a reinforcing material such as a reinforcing bar used at the time of building a slab is provided on a gantry movably disposed on a main girder on both sides of the bridge girder or on a building slab. By freely arranging the reinforcing members, it is possible to easily move the reinforcing members arranged in the respective molds when constructing the floor slab.

Further, rails to be disposed on the main girder on both sides of the bridge girder or on the building floor slab for moving the gantry,
By constructing a trapezoidal long rail material and short rail material, the connecting surface of each rail material is not a vertical plane but an inclined surface, so disassembly and connection of each rail material due to gantry movement The gantry can be easily moved, and the gantry can be moved very easily.

Further, by continuously constructing a continuous slab of a plurality of pier spans from the middle of each pier to the pier, a heavy object is placed at the center of the beam supported at both ends. By utilizing the effect of suppressing the deflection of the beam that occurs when a heavy object is placed on the support portion at both ends of the beam, the deflection of the bridge girder between the piers can be suppressed.

[Brief description of the drawings]

FIG. 1 is a front view of a floor slab construction apparatus according to the present invention.

FIG. 2 is a side view of the same.

FIG. 3 is an enlarged front view of a main part showing a support and fixing mechanism of the wing formwork.

FIG. 4 is a simplified front view showing the sequence of building a plurality of continuous span slabs.

FIG. 5 is a side view showing a procedure for moving the work scaffold.

FIG. 6 is a side view showing the operation procedure of the finisher.

FIG. 7 is an enlarged front view of the same.

FIG. 8 is a side view showing a disassembly and movement procedure of the rail.

FIG. 9 is a front view of another floor slab construction apparatus according to the present invention.

FIG. 10 is a side view of the same.

[Explanation of symbols]

 Reference Signs List 12 bridge pier 14 bridge girder 16 cross girder 18 center form 20 main girder 22 wing form 32 working scaffold 34 suspension member 36 floor slab 38 gantry 42 elevating and moving means 52 fixing tool 54 cross beam 56 telescopic jack 58 reinforcing material 60 moving mechanism 62 long Rail material 64 Short rail material 78 Concrete

 ────────────────────────────────────────────────── ─── Continuing from the front page (72) Inventor Mitsuru Morimoto 144 Jijo-jo, Masamasa-cho, Motosu-gun, Gifu F-term (reference) 2D059 AA14 CC04 CC09 DD09 DD17 GG55

Claims (10)

[Claims] 1. A center type which is arranged on a cross beam (16) in a width direction of a bridge girder (14) arranged between upper portions of a pier (12) so as to be movable in the front-rear direction of the bridge and to be able to move up and down. Frame (18) and bridge girder (1
4) Both wing forms (2) that are movable in the front-back direction of the bridge along the main girders (20)
In the method of constructing the floor slab (36) by placing concrete through (2) and (22), the main girder on both sides of the bridge girder (14)
(20) or a wing formwork (22) on a scaffold (40) suspended on a gantry (38) movably disposed on a building floor slab (36).
The gantry (3
8) By moving, the wing formwork (22) can be freely moved in the front-rear direction of the bridge, and when placing concrete (78) in the center formwork (18) and the wing formwork (22), the wing formwork ( Telescopic cross beam (54) fixed to the back of (22) and telescopic jack (56) pivotally supported on the outer base end of wing formwork (22) of cross beam (54)
The main girder end of the cross beam (54) of the fixture (52) consisting of
(20) The wing formwork (22) is fixed by being pivotally supported at the upper corner and by attaching the lower end of the telescopic jack (56) to the lower edge of the main girder (20). How to build a floor slab. 2. A work scaffold located below the center formwork (18), below the cross beam (16) of the bridge girder (14), and between the main girder (20) on both sides.
(32) is suspended from the left and right sides of the back of the center formwork (18) via a pair of suspension members (34) that are detachably mounted and are disposed at predetermined intervals in the front-rear direction. When the cross beam (16) of the suspension member (34) comes close to the movement of the center formwork (18), the cross beam contact side (34a) of each pair of suspension members (34) is removed, and the other side of each pair is removed. After being supported and moved by the suspension member (34b) and the removed suspension member (34a) having passed through the cross beam (16),
This suspension member (34a) is again suspended from the center formwork (18), the other cross beam contact side (34b) of each pair of suspension members (34) is removed, and after passing through the cross beam (16), 2. A method according to claim 1, wherein said suspension member is hung on a center formwork to move a work scaffold. 3. A moving mechanism (60) for moving a reinforcing material (58) such as a reinforcing bar used in building a slab to a gantry (38).
The floor slab construction method according to claim 1 or 2, wherein the slab is arranged so as to be movable and vertically movable. 4. A bridge girder for moving a gantry (38).
(14) The rails to be disposed on the main girder (20) or the building slab (36) on both sides are long rail material (62), short rail material (64),
The long rail material (62) is formed into a trapezoidal shape by swelling the lower ends of both ends in the length direction outward, and the upper ends of the short rail materials (64) in the length direction are swelled outward. Inverted trapezoidal shape,
After arranging the long rail members (62) adjacent to each other, the short rail members (64) are inserted between the long rail members (62) so that the respective rail members (62) and (64) are inserted. 4. The method according to claim 3, wherein the slab is disassembled and moved by removing the short rail material (64) first when connecting and moving. 5. A method for constructing a continuous slab of a plurality of pier spans,
2) The deflection of the bridge girder (14) between the piers (12) is suppressed by sequentially performing the operation from the intermediate portion toward the pier (12). The method for constructing a floor slab according to claim 3 or 4. 6. A center type movable in the front-rear direction of a bridge and vertically movable on a horizontal girder (16) of a bridge girder (14) disposed between upper portions of a pier (12). Frame (18) and bridge girder (1
4) Both wing forms (2) that are movable in the front-back direction of the bridge along the main girders (20)
2), (22), in a device for constructing a floor slab (36) by placing concrete, the main girder (2) on both sides of the bridge girder (14)
(0) or the wing form (22) is moved up and down via the elevating movement means (42) to the scaffold (40) suspended on the gantry (38) movably disposed on the construction floor slab (36). The gantry (38) is moved freely and detachably, and the wing formwork (2
2) is movable in the front-rear direction of the bridge, and when concrete (78) is poured into the center formwork (18) and the wing formwork (22), it is stretchable and fixed to the back of the wing formwork (22). Cross beam
(54) and a telescopic jack (56) pivotally supported on the outer base end of the wing formwork (22) of the cross beam (54).
The main girder end of (54) is pivotally supported at the upper corner of the main girder (20), and the lower end of the telescopic jack (56) is brought into contact with the lower edge of the main girder (20), thereby forming a wing formwork. A floor slab construction apparatus characterized by fixing (22). 7. A work scaffold located below the center formwork (18), below the cross beam (16) of the bridge beam (14), and between the main beams (20) on both sides.
(32) is suspended from the left and right sides of the back of the center formwork (18) via a pair of suspension members (34) that are detachably mounted and are disposed at predetermined intervals in the front-rear direction. When the cross beam (16) of the suspension member (34) comes close to the movement of the center formwork (18), the cross beam contact side (34a) of each pair of suspension members (34) is removed, and the other side of each pair is removed. After the suspension member (34a) on the removed side has passed through the cross beam (14), the suspension member (34a) is again suspended on the center formwork (18). Then, the other cross beam contact side (34b) of each pair of suspension members (34) is removed, and after passing the cross beam (16), the suspension member (34b) is again suspended on the center formwork (18). The floor slab construction apparatus according to claim 6, wherein the work scaffold (32) is moved. 8. A moving mechanism (60) for moving a reinforcing material (58) such as a reinforcing bar used for building a slab to a gantry (38).
The floor slab construction apparatus according to claim 6 or 7, wherein the floor slab is arranged so as to be movable and vertically movable. 9. A bridge girder for moving a gantry (38).
(14) The rails to be disposed on the main girder (20) or the building slab (36) on both sides are long rail material (62), short rail material (64),
The long rail material (62) is formed into a trapezoidal shape by swelling the lower ends of both ends in the length direction outward, and the upper ends of the short rail materials (64) in the length direction are swelled outward. Inverted trapezoidal shape,
After arranging the long rail members (62) adjacent to each other, the short rail members (64) are inserted between the long rail members (62) so that the respective rail members (62) and (64) are inserted. 9. The floor slab construction apparatus according to claim 8, wherein the slabs are connected and disassembled and moved by removing the short rail member (64) first when moving. 10. A method for constructing a continuous slab of a plurality of pier spans,
(12) The deflection of the bridge girders (14) between the piers (12) is performed sequentially from the intermediate portion toward the pier (12), whereby the deflection is suppressed. The floor slab construction apparatus according to claim 8 or 9.