JP2000291202A - Steel deck web girder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure lateral rigidity without using a stiffening frame and lessen the restraint of prestress in the axial direction by attaching a flange comprising a horizontal piece and a vertical piece to the upper end of a web, and attaching a shape steel comprising the horizontal piece and the vertical piece to the side in the neighborhood of the lower end of the web. SOLUTION: For instance, a connection hole 2 with a girder material 1 continuously connecting to both the ends of a steel deck web 3 is drilled in the girder material 1 of the protrusion erection girder bridge of prestressed concrete structure. In addition, an inverted T-shaped split T steel is welded on the upper end of the girder material 1, and a penetration reinforcing bar hole 5 inserting a reinforcing bar is welded on the vertical piece. Furthermore, the horizontal piece of an angle steel 6 is made upward on the side in the neighborhood of the lower end, opposed to both the faces of the steel deck web 3 to be welded, and a penetration reinforcing bar hole 7 inserting the reinforcing bar is drilled in the steel deck web 3 of a web embedded part. The upper face of the horizontal piece of the angle steel 6 is made the upper face finished face of lower floor board concrete, and a lower part than it is embedded in the lower floor board concrete.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a corrugated steel web girder used for a structure such as a bridge having a prestressed concrete structure.

[0002]

2. Description of the Related Art An all-concrete bridge has features such as being excellent in silence due to its large mass and not rusting like a steel girder bridge.
There are problems such as disadvantageous seismic resistance and enlargement of substructures such as piers. Therefore, a bridge of a new structure type combining steel and concrete has been developed and put into practical use. The bridge of this composite structure is different from a conventional steel girder bridge in which a steel plate and a concrete are simply composited as illustrated in FIG. 15, and a corrugated steel plate which is bent so that a waveform is repeated in the bridge axis direction is used. It is a corrugated steel sheet web girder used as a sheet (web). Conventionally, as shown in FIG. 14, such a corrugated steel web girder is formed by forming through holes 7 near the upper and lower ends of a web 3 and inserting a through reinforcing bar 31, thereby forming upper and lower floor slabs 41 and 42 of concrete. , Forming a box-shaped section girder. This corrugated steel web girder can effectively introduce prestress into the upper and lower slab concrete without the axial force being restricted by the corrugation accordion effect. Thus, it is known that a corrugated steel plate has a good affinity for prestressed concrete.

As one of the techniques for suitably utilizing the new corrugated steel web girder, a bridge construction method using an overhanging work apparatus has been developed. In this construction method, a removable rail is temporarily fixed on an existing bridge block, and an overhanging work device is mounted on the rail so that it can move forward and backward, and formwork and scaffolds are suspended from this overhanging work device. The concrete block is cast, concrete is poured, and prestress is introduced into this concrete block.
Next, in preparation for the construction of the next block, the temporary fixing of the rail is released, the rail is advanced to the next block position and temporarily fixed again, and the overhanging work device is advanced to the next block construction position to construct the block. This process is repeated to overhang the girders one after another to construct a bridge.

FIG. 16 shows an example. FIG. 16 is a part of a side view of the overhanging girder bridge 60, and shows a state in which the blocks are extended one block at a time from the pier 63 using the overhanging work device 64 while being balanced in the bridge axis direction left and right. For the pier 62, the overhanging of the bridge body 65 is completed, and a separate support structure is constructed between the pier 62 and the abutment 61, and the pier 62 is connected with cast-in-place concrete. The other waits for the bridge 65 extending from the pier 63 and closes and connects it to the bridge 65 at the center to complete a series of bridges. 17 is a view taken in the direction of arrows FF in FIG. 16, and FIG. 18 is a view taken in the direction of arrows GG in FIG. 16. The box girder has a concrete upper slab 66 and a concrete lower slab 67 connected by a corrugated steel web 68. It shows a cross section.

[0005]

Since a corrugated steel sheet has a high degree of freedom in deformation, a technique has been proposed in which a round steel or the like is welded to the upper and lower ends of the corrugated steel sheet to impart rigidity. However, it is difficult to obtain sufficient lateral rigidity by using only this round steel, and the present applicant has filed Japanese Patent Application No. 9-71815 and Japanese Patent Application No. 10-2809.
In the 67th application and the like, it has been proposed to mount a stiffening frame across a corrugated steel sheet in order to restrict the deformability of the corrugated steel sheet and control the deformation. An object of the present invention is to provide a corrugated steel sheet web girder which can secure lateral rigidity and restrain deformation without using a stiffening frame, and is less restricted by axial prestress. Furthermore, in the case of the concrete frame of the upper floor slab, it was necessary to make the corrugated portion coincide with the steel plate surface, and the processing was complicated, and it was necessary to take measures to prevent the mortar from leaking. It is an object of the present invention to develop a corrugated steel web girder having a flange structure that facilitates management of the length of the girder material embedded in slab concrete.

[0006]

SUMMARY OF THE INVENTION The present invention relates to a girder material using a corrugated steel sheet which is bent so that a waveform is repeated in the longitudinal direction of a structure as a web. A corrugated steel sheet web girder attached to an upper end and a section steel formed of a horizontal piece and a vertical piece attached to a side face near a lower end of the web.
The attachment may be performed by any known means, but it is preferable because welding is simple and can be easily and firmly joined. The flange is a member in which the horizontal piece continuously welds the corrugated steel sheet, and a vertical piece is a member that secures a strong connection with the concrete and increases the bending rigidity of the corrugated steel sheet. In this case, a ready-made inverted T steel, channel steel, or H-shaped steel can be used for the flange, which is preferable. The section steel to be attached to the side face near the lower end of the web may be an angle steel, a channel steel or a C-section steel, or may be a combination of these as appropriate.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. This embodiment is an example in which the present invention is applied to an overhanging girder bridge of a prestressed concrete structure as shown in FIG. 16, but illustration of PC steel is omitted.

FIGS. 1 to 3 show a girder member 1 of an overhanging girder bridge shown in FIG. 16, FIG. 1 is a side view, and FIG.
FIG. 3 is a view taken in the direction of arrow A, and FIG. 3 is a view taken in the direction of arrow BB in FIG. The corrugated steel sheet web 3 has a corrugated shape in which irregularities are repeated, and connection holes 2 for connecting the beam members 1 to be connected are formed at both ends.
An inverted T-shaped split T steel 4 is welded to the upper end of the girder 1, and a through hole 5 for penetrating a reinforcing bar is drilled in a vertical piece thereof. In the vicinity of the lower end, an angle iron 6 is welded to the side face of the corrugated steel sheet web 3 with both horizontal pieces facing upward. A portion below the vertical piece of the angle iron 6 is buried in the lower slab concrete, and the corrugated steel sheet web of the web embedding portion is provided with a through-hole 7 through which a reinforcing bar is inserted. The upper surface of the horizontal piece of the angle iron 6 is the upper surface finishing surface 9 of the lower slab concrete, and the lower portion is embedded in the lower slab concrete.

The horizontal pieces of the split T steel 4 at both ends of the girder 1 are connected to a girder connected continuously with a splice plate 8 so as to transmit the axial tensile force at the time of overhanging. The reverse T steel 4 used here may be a flat steel combined with a T-shape and welded. However, it is convenient to use a split T steel as a commercially available product with selected dimensions.

FIG. 4 is a side view of the overhanging work apparatus 10 when the bridge shown in FIG. 16 is constructed using the girder 1 shown in FIG. On a rail 12 temporarily fixed to the upper surface of an existing block (bridge) 11, via a wheel 13 of a traveling device, a parallel front main structure 14, a rear main structure 15, and a parallel lower longitudinal beam 16,
An overhanging longitudinal beam 17 that is longer than the lower longitudinal beam that overhangs the new girder block; a suspending member 18 that suspends the overhanging longitudinal beam 17 from the top end of the front main structure 14; A twill structure 19 for stiffening the beam and a work table 20 suspended from the overhanging work apparatus 10 are shown. The overhanging vertical beam 17 is disposed at a position sufficiently high from above the bridge surface so that the corrugated steel beam 1 can pass thereunder. In addition, since the support 21 is vertically provided in front of the overhanging vertical beam 17 and the corrugated steel web girder 1 has a flange on itself, the girder's own weight, the weight of the upper and lower concrete slabs, the weight of the formwork, etc. It is not necessary to apply all the load to the erection work device, which can be simplified as compared with the conventional one, indicating that the method is suitable for such a construction method.

FIG. 5 is a view as viewed in the direction of arrows CC in FIG. 4, and FIG. 6 is a view as viewed in the direction of arrows DD in FIG. 4. The overhanging work apparatus 10 has a substantially gate-shaped structure. A two-way overhead traveling crane 24 is suspended on the front cross beam 22 and the rear cross beam 23, an electric chain block 25 is suspended, and the corrugated steel web girder 1 supplied from behind the overhanging work apparatus 10 is taken in. , Can be suspended and arranged at a predetermined position.

FIGS. 7 to 9 are explanatory views of variations of the combination of the flange structures of the girder 1 according to the present invention. FIG. 7 shows the most preferable one described above, which is provided with a split T steel 4 at the upper end and an angle iron 6 near the lower end. The penetrating rebar 31 is shown. FIG. 8 shows an H-shaped steel 32 used at the upper end. FIG. 9 shows a channel (channel steel) 33 in place of the angle iron near the lower end. These may be combined by appropriately changing the combination.

FIG. 10 is an explanatory view of the connection between the conventional corrugated steel web girder 1 and the upper deck slab concrete formwork 35.
FIG. 12 is a view taken in the direction of arrows EE in FIG. 12, and FIG. 12 is a detailed view of a portion H in FIG. There is a problem that the processing of the form plate is complicated for the corrugated steel sheet web 3 in which the waveform is repeated, and there is a problem that the mortar leaks from a contact portion between the form plate end face and the steel sheet, and the sealing material 36 such as a rubber plate is required. There was a problem to do.

In the corrugated steel sheet web girder of the present invention, a flange provided with a horizontal plate is provided at the upper end of the corrugated steel sheet.
What is necessary is just to make the form contact with this horizontal plate, and it is not necessary to process a form plate according to a waveform. Therefore, the sealing was simplified, and the mortar and paste did not leak.

Although the above embodiment has been described with reference to an example of an overhanging girder bridge, the present invention is not limited to this. For example, the present invention is applied to a corrugated steel web girder used for an extrusion method or a cast-in-place girder bridge. The same effect can be expected without any problem.

The flange structure of the corrugated steel sheet web girder of the present invention increases the Y-axis rigidity of the girder by attaching a shaped steel having horizontal pieces, reduces the deformation flexibility of the corrugated steel sheet, and improves the X-axis cross-sectional performance. , So that it can bear the load of the concrete on the upper and lower floor slabs. In addition, the type, structure, and mounting method of the shaped steel used are merely examples, and are not limited as long as the rigidity in the Y-axis direction of the corrugated steel web, which is the gist of the present invention, can be ensured. Of course not.

[0017]

According to the corrugated steel sheet web girder of the present invention, a girder material used as a web is formed of a corrugated steel sheet which is bent so that the corrugation is repeated in the longitudinal direction of a structure such as a bridge.
At the upper end of the web, a section steel such as a split T steel or an H section steel having a horizontal piece and a vertical piece is welded, and a section steel such as an angle steel or a channel steel having a horizontal piece and a vertical piece on the side near the lower end. Welding reduces the inherent freedom of deformation of corrugated steel sheets, increases Y-axis rigidity, simplifies the connection with the upper deck slab concrete form, and makes the finished surface of the lower deck slab concrete more accurate. It is possible to construct a precise and accurate structure.

[Brief description of the drawings]

FIG. 1 is a side view of a girder member.

FIG. 2 is a view taken along the line AA of FIG. 1;

FIG. 3 is a view taken in the direction of arrows BB in FIG. 1;

FIG. 4 is a side view of the overhanging work apparatus.

FIG. 5 is a view taken in the direction of the arrows CC in FIG. 4;

FIG. 6 is a view as seen from the direction of the arrow DD in FIG. 4;

FIG. 7 is an explanatory diagram showing a configuration example of a girder member of the embodiment.

FIG. 8 is an explanatory diagram illustrating a configuration example of a girder member according to the embodiment.

FIG. 9 is an explanatory diagram showing a configuration example of a girder member of the embodiment.

FIG. 10 is an explanatory view showing a conventional corrugated steel sheet web and an upper floor slab form.

FIG. 11 is a view as seen in the direction of arrows EE in FIG. 10;

FIG. 12 is a detailed view of a portion H in FIG. 11;

FIG. 13 is an explanatory diagram of the connection with the upper and lower floor slab concrete of the embodiment.

FIG. 14 is an explanatory diagram of connection with conventional upper and lower floor slab concrete.

FIG. 15 is an explanatory view for connection with a conventional upper slab concrete.

FIG. 16 is an explanatory view of an overhanging girder bridge.

FIG. 17 is a view as viewed in the direction of arrows FF in FIG. 16;

18 is a view taken in the direction of arrows GG in FIG.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Girder material 2 Connection hole 3 Corrugated steel plate web 4 T steel 5 Penetrating rebar hole 6 Angle steel 7 Penetrating rebar hole 8 Splice plate 9 Concrete finishing surface 10 Overhanging work equipment 11 Existing block (bridge) 12 Rail 13 Wheel 14 Front Main structure 15 Rear main structure 16 Lower vertical beam 17 Overhanging vertical beam 18 Suspension member 19 Aya structure 20 Work table 21 Support column 22 Front cross beam 23 Rear cross beam 24 Ceiling crane 25 Electric chain block 26 Form receiving beam 31 Penetrating steel 32 H-shaped Steel 33 Channel (channel steel) 35 Formwork 36 Packing (sealant) 41 Upper deck concrete 42 Lower deck concrete 43 Round steel 51 Steel girder 52 Upper flange 53 Lower flange 54 Stiffener 55 Stud dowel 60 Overhanging girder bridge 61 Abutment 62 Bridge pier 63 Bridge pier 64 Installation work equipment 65 Bridge body 66 Conch REIT upper floor slab 67 concrete lower floor slab 68 web

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[Procedure amendment]

[Submission date] March 27, 2000 (2003.
7)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] 0013

[Correction method] Change

[Correction contents]

FIG. 10 is an explanatory view of the connection between the conventional corrugated steel web girder 1 and the upper deck slab concrete formwork 35.
10 is a view as seen from the direction of arrows EE in FIG. 10 , and FIG. 12 is a detailed view of a portion H in FIG. There is a problem that the processing of the form plate is complicated for the corrugated steel sheet web 3 in which the waveform is repeated, and there is a problem that the mortar leaks from a contact portion between the form plate end face and the steel sheet, and the sealing material 36 such as a rubber plate is required. There was a problem to do.

[Procedure amendment 2]

[Document name to be amended] Statement

[Correction target item name] Explanation of sign

[Correction method] Change

[Correction contents]

[Description of Signs] 1 girder material 2 connection hole 3 corrugated steel plate web 4 T steel 5 penetrating rebar hole 6 angle steel 7 penetrating rebar hole 8 splice plate 9 concrete surface 10 overhanging work device 11 existing block (bridge) 12 Rail 13 Wheel 14 Front main structure 15 Rear main structure 16 Lower vertical beam 17 Overhanging vertical beam 18 Suspension member 19 Aya structure 20 Workbench 21 Support post 22 Front cross beam 23 Rear cross beam 24 Ceiling crane 25 Electric chain block 26 Formwork beam 31 Penetrating rebar 32 H-section steel 33 Channel (channel steel) 35 Formwork 36 Packing (seal material) 41 Upper deck slab concrete 42 Lower deck slab concrete 43 Round steel 51 Steel girder 52 Upper flange 53 Lower flange 54 Stiffener 55 Stud dowel 60 Tension Girder bridge to be built 61 Abutment 62 Bridge pier 63 Bridge pier 64 Overhang work device 65 Bridge Body 66 Concrete upper slab 67 Concrete lower slab 68 Web

Claims (3)

[Claims] 1. A girder material using a corrugated steel sheet bent as a web in a longitudinal direction of a structure as a web, wherein a flange composed of a horizontal piece and a vertical piece is attached to an upper end of the web, and a horizontal piece is provided. A corrugated steel web girder, wherein a shape steel comprising a vertical piece and a vertical piece is attached to a side surface near a lower end of the web. 2. The web girder according to claim 1, wherein the flange is made of an inverted T steel or an H-section steel. 3. The corrugated steel web girder according to claim 1, wherein the section steel attached to the side face near the lower end of the web is an angle iron or a channel steel.