JP6310362B2 - A hanging bracket that fixes the floor slab formwork to the main girder. - Google Patents

Description

  The present invention relates to a support for supporting a formwork for forming a concrete floor slab of a bridge, and more particularly to a hanging mold for holding a lower formwork of a concrete floor slab on an I-type main girder.

In general, the concrete slab of the bridges, a slab mold frame arranged between the main girder between a plurality of type I was installed at prescribed intervals on the support surface of the pier, the rebar reinforcement Mr on formwork It is formed by casting concrete.

  In this case, as a method of fixing the floor slab formwork, the floor slab formwork is received by a support material such as a beam material, and the beam material is supported by a support material such as a pipe support, A suspension bolt holder that is welded to the upper flange of the I-type main girder, and a method of suspending the mold holder by holding a mold support such as a beam material with the suspension bolt suspended from the suspension bolt receiver ( There exists patent document 1).

JP 2008-291606 A

  In support method formwork support, a large number of formwork support materials and support materials are placed in the space under the bridge, and roots are required to connect the support materials. However, there is a problem that a large amount of material is required for supporting the formwork and the amount of work increases.

  On the other hand, in the case of holding a formwork support material such as a beam material with a suspension bolt, the suspension bolt support bracket is attached to the flange portion of the main girder, which is an important structural member of the bridge. Since welding is fixed, there is a concern that the girders may be adversely affected by heat input, and members of a material that cannot be welded may be specified by design specifications.

  The present invention has been proposed in view of the above points, and mainly uses a floor slab form capable of constructing a bridge floor slab form with less man-hours without adversely affecting structural members such as girders. An object of the present invention is to provide a hanging bracket that is relatively fixed to a girder.

In order to achieve the above-mentioned object, the invention disclosed in claim 1 forms a concrete floor slab on the upper surface of the main girder by fixing and fixing the formwork for the floor slab between a plurality of main girders installed on the upper surface of the pier. In doing so, it is a hanging bracket that suspends and holds the beam material holding the floor slab formwork on the main girder,
A flat bar formed by welding a cap nut to the peripheral edge of the opening in a state of surrounding the upper surface opening of the bolt insertion hole provided through the longitudinal end;
A threaded rod having one end screwed to the cap nut through the pre Symbol bolt insertion hole is welded to the flat bar,
It consists of a nut that is screwed to the other end of this threaded rod,
The screw rod screwed to the flat bar passes through a bolt insertion hole formed in the claw portion of the beam material and protrudes to the lower side of the beam material. A nut is screwed into the protruding portion of the screw rod and the floor slab is inserted. Securely fix the formwork and beam material in place,
Wherein the setup muscles that are anchored member arranged along the longitudinal direction on the upper surface of the main girder of the upper flange configured in type I material and the flat bar is characterized in that it is fixed by spot welding.

  Further, the present invention disclosed in claim 2 is characterized in that, in addition to the structure of claim 1, a receiving portion of the spacer block is installed on the lower surface of the flat bar.

In the present invention, a set bar is fixed to the upper surface of the upper flange of the main girder with an anchor material, a bolt insertion hole is formed through the end portion, and a cap nut is welded corresponding to the bolt insertion hole. Since the flat bar is fixed relative to the main girder by spot welding to the set-up bars, the main material which is a structural material is used when fixing the flat bar for suspending and holding the beam material for the formwork. There is almost no thermal effect on the girder and the bridge strength is not reduced.

Further, in the case of forming a receiving portion of the spacer blocks to the lower surface of the flat bar, because the distance between the main beam and the flat bar can be sufficiently maintained, it is possible to secure the head size of the concrete.

It is an extraction sectional view of the important section showing at the time of formation of a concrete floor slab. It is an extraction perspective view in the state where the formwork support beam was supported by the main girder. It is a perspective view which shows one Embodiment of a hanging type | mold metal fitting. It is a perspective view which shows another embodiment of a hanging type | mold metal fitting.

  As shown in Fig. 1, the concrete floor slab in the bridge is composed of a plurality of main girders (1) made of I-type steel installed on the pier (not shown) and a floor slab form (2) as a beam material ( 3) It is formed in a state in which the upper flange (1a) of the main girder is taken in by fixing and holding relatively, and placing concrete after placing reinforcing bars on the upper surface of the floor slab formwork (2). .

  This floor slab formwork (2) is composed of a plywood panel (2a) having an end inclined downwardly to form a haunch part, and a plywood panel (2a) in order to maintain the flatness of the plywood panel (2a). (2a) having a plurality of single tubes (2b) arranged in parallel to the back surface, and a downwardly inclined portion of the plywood panel (2a) formed at the end portion of the upper flange (1a) of the main girder (1) ) To contact from below.

The beam material (3) holding the floor slab formwork (2) is a bite beam composed of an outer beam and an inner beam, and a claw portion (3c) formed at the end of the beam material (3) is a hanging metal fitting (described later). The floor slab form (2) can be fixed and held relatively to the main girder (1) by being suspended and supported in 5).

  The hanging metal fitting (5) is a steel flat in which a bolt insertion hole (6) is formed through both ends and a cap nut (7) is welded to the peripheral edge of the upper surface side opening of the bolt insertion hole (6). A screw rod (10) that passes through a bolt insertion hole (9) that is screwed into the bar (8) and the cap nut (7) and formed in the claw portion (3c) of the beam member (3); The beam member (3) includes a washer (11) and a nut (12) screwed into the screw rod (10) below the claw portion (3c).

  In addition, two pairs of round steel short pieces (13) project along the long axis side edge of the flat bar (8) on the lower surface of the flat bar (8) constituting the hanging metal fitting (5). The receiving portion (15) of the spacer block (14) is formed by the short pieces (13) opposed in the short axis direction.

  The hanging metal fitting (5) having the above-described structure is engaged with an anchor member (16) arranged in the longitudinal direction at a predetermined pitch on the upper surface of the upper flange (1a) of the main girder (1). The flat bar (8) of the hanging bracket (5) is fixed to the set-up bar (17) supported on the upper surface of the main girder (1) by spot welding, and the flat bar ( Insert the spacer block (14) between the lower surface of 8) and the upper surface of the upper flange (1a) of the main girder (1) to ensure the fog size on the upper surface of the upper flange (1a) of the main girder (1). I have to do it.

  For the floor slab between the adjacent main girders (1) with the flat bar (8) constituting the hanging bracket (5) held by the main girders (1) via the setup bars (17) The formwork (2) and the beam material (3) for holding the formwork for floor slab (2) are arranged, and the bolt insertion hole (9) formed in the claw portion (3c) of the beam material (3) is disposed. The screw rod (10) is inserted, and the upper end of the screw rod (10) is screwed into the cap nut (7) through the bolt insertion hole (6) formed in the flat bar (8), and the claw portion of the beam member (3) ( 3c) Attach the washer (11) and nut (12) to the screw rod (10) that continues to the lower side, and operate the nut (12) to form the slab formwork (2) and beam material ( 3) is firmly fixed at a predetermined position. At this time, a synthetic resin tube (not shown) is fitted into the portion located between the flat bar (8) of the screw rod (10) and the claw portion (3c) of the beam member (3), and concrete Is prevented from adhering to the screw rod (10).

  FIG. 4 shows a hanging metal fitting (5) of a different embodiment, which is used when a floor slab form (2) is supported on one side of a main girder (1), and a cap nut (7) is provided. A bolt insertion hole (6) welded to the peripheral edge of the upper surface opening is formed on one side of the flat bar (8).

  In the hanging metal fitting (5) having the above-described structure, the hanging tool (5) is formed on the set-up bar (17) supported by the anchor material (16) on the upper surface of the upper flange of the main girder (1). By fixing the flat bar (8) by spot welding, it is possible to almost eliminate the thermal effect of welding on the main girder, which is the main structural material, and the bridge strength is not lowered. Further, a bolt insertion hole (9) is formed through the flat bar (8), a cap nut (7) is welded and fixed, and a screw rod (10 ) Beam material for supporting the formwork (3) is suspended and held to hold the formwork for floor slab (2), thus simplifying the space under the bridge and providing various support materials. Arrangement is simplified, and the workability of formwork installation work and formwork work can be improved.

  The present invention is most suitable when a bridge deck is manufactured on-site.

  DESCRIPTION OF SYMBOLS 1 ... Main girder, 2 ... Formwork for floor slabs, 3 ... Beam material for formwork holding, 5 ... Hanging metal fitting, 6 ... Port insertion hole, 7 ... Cap nut, 8 ... Flat bar, 10 ... Screw rod, 12 ... Nut, 14 ... Spacer block, 15 ... Spacer block receiving part, 16 ... Anchor material, 17 ... Setup line.

Claims (2)

The floor slab formwork (2) is fixedly held between the main girder (1) installed on the pier upper surface, and the concrete slab is formed on the upper surface of the main girder (1). 2) a hanging bracket (5) for suspending and holding the beam member (3) for holding the main beam (1),
A flat bar (8) formed by welding a cap nut (7) to the peripheral edge of the opening in a state of surrounding the upper surface opening of the bolt insertion hole (6) provided through the longitudinal end;
A screw rod (10) having one end screwed into a cap nut (7) welded to the flat bar (8) through the bolt insertion hole ( 6 );
It consists of a nut (12) screwed to the other end of this threaded rod (10),
The screw rod (10) screwed to the flat bar (8) passes through the bolt insertion hole ( 9 ) formed in the claw portion (3c) of the beam material (3), and is below the beam material (3). And the nut (12) is screwed into the protruding portion of the threaded rod (10) to securely fix the floor slab form (2) and the beam material (3) in place,
The setup bar (17) fixed by the anchor material (16) arranged along the longitudinal direction on the upper surface of the upper flange of the main girder (1) made of I-shaped material and the flat bar ( 8) A hanging type metal fitting for fixing a floor slab form to a main girder, which is fixed by welding.   2. A hanging metal fitting for fixing a floor slab form frame to a main girder according to claim 1, wherein a receiving portion (15) of a spacer block (14) is installed on the lower surface of the flat bar (8).

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