CN201125533Y - Preflex beam turning rotary table - Google Patents

Abstract

The utility model pertains to the field of wide span pre-bending combination beam construction equipment, specially relates to a rotary plate for pre-bending beam, which solves the problem of easiness of twist when rotating pre-bending beam in prior art, leading to cracking of high-grade concrete above the upper beam. The rotary plate for pre-bending beam comprises upper rotary plate in semi-circular shape and lower rotary plate in semi-circular shape with same diameter. The upper and lower rotary plates are connected by a connecting bolt. The rotary plate is movably mounted on the substrate, a rolling bearing is fixed on the upper portion of the substrate, and the lower portion of the substrate is connected with rigid foundation by a embedded member. A hard maple is dispose on the site where upper rotary plate and lower rotary plate meets beam body. The utility model has advantages that beam body is not twisted during rotation process of upper semi-manufactured beam, concrete can not split, operation is simple, control is easy, and construction quality and construction process can be guaranteed.

Description

Preflex beam upset dish

Technical field

The utility model belongs to the technical field of Large Span Pre-bent Combination Beam construction equipment, is specifically related to a kind of preflex beam upset dish.

Background technology

Biplate is when pressing that biplate is to the naked beam of compressed steel in the construction technology, in order to make up and down two beam mechanical states symmetry substantially, last slice girder steel is falling to put, and is promptly just putting by two

Beam is placed to

Shape waits bottom flange (last slice beam top, following sheet beam below) high-grade concrete to build and finish, promptly Shape discharges (discharge loading force and promptly concrete is applied prestressing force) behind the loading force, and last slice beam need overturn, the setting up of the web concrete of can then constructing and beam body.

Because last slice beam is inverted, beam is very long, and very thin again, the traditional upset mode of whole I shape semiproduct beam, is turned round easily in the switching process, causes bottom flange (last slice beam top) high-grade concrete cracking, so the upset of beam body is one of main key point of construction.

Summary of the invention

The utility model is turned round easily in order to solve existing Pre-bent Combination Beam upset, causes a problem of beam top high-grade concrete cracking, provides a kind of Large Span Pre-bent Combination Beam to construct with preflex beam upset dish.

The utility model adopts following technical scheme to realize: preflex beam upset dish, comprise semicircular top rotary table and isodiametric semicircular lower rotary table with it, upper and lower rotating disk connects by connecting bolt, the upset disk activity is installed on the base, base top is rolling bearing fixedly, and the base bottom is connected with rigid foundation by built-in fitting.Top rotary table, lower rotary table are provided with hardwood with the position that the beam body contacts.

The utlity model has following beneficial effect: guaranteed that last slice semiproduct beam switching process central sill body can not turned round, concrete can not ftracture, and operation is easy, control is easy, has guaranteed construction quality and construction speed.

Description of drawings

Fig. 1 is a structural representation of the present utility model

Among the figure: 1-top rotary table, 2-connecting bolt, 3-lower rotary table, 4-rolling bearing, 5-base, 6-hardwood, 7-built-in fitting, 8-rigid foundation, 9-beam body

The specific embodiment

In conjunction with the accompanying drawings the specific embodiment of the present utility model is described further, embodiment is used for illustrating of the present utility model, rather than it is imposed any restrictions.

Preflex beam upset dish, it is characterized in that comprising semicircular top rotary table 1 and isodiametric semicircular lower rotary table 3 with it, upper and lower rotating disk connects by connecting bolt 2, rotating disk is movably arranged on the base 5, base 5 tops are rolling bearing 4 fixedly, and base 5 bottoms are connected with rigid foundation 8 by built-in fitting 7.The position that top rotary table 1, lower rotary table 3 contact with beam body 9 is provided with hardwood 6.

Base 5, the horizontal force and the vertical support force that provide the beam body to produce, upper and lower rotating disk constitutes the full circle dish together, finishes 180 degree upsets.Upper and lower rotating disk connects by connecting bolt 2, makes it become rigid unitary.Hardwood 6 avoids beam body 9 to contact with the rotating disk rigidity, and the semiproduct beam is protected.Rolling bearing 4 rotates rotating disk on base 5.Built-in fitting 7 connects base 5 and rigid foundation 8, and enough support forces are provided.

Originally be as follows with the novel course of work:

1, after two pre-bending girder steels load, build fist stage concrete and unloading simultaneously, last slice beam is hung out afterburning support, place on the mounted upset pedestal, support and firm beam body, the situation of checkout facility can begin turning after ready.

2, on the upset pedestal three turning devices are set, are placed on 0.13L and 1/2L place (the upset disc radius is 1.0m) respectively, each turning device is made up of upper and lower two rotating disks.Earlier preflex beam is hung in lower rotary table during use, cover top rotary table then, preflex beam is fixed on the inside casing of turning device, in climbing over journey, produce changing of the relative positions distortion to prevent preflex beam with crane.

3, because of precasting yard is the beta site, mechanical drive mode is not set during upset, but realizes the upset of beam by the rolling bearing that is installed in upset disk both sides.

4, for remaining on three upset dish basic synchronization in the switching process, mark marker line and reading every 5mm, with the simultaneously operating of three disks of time control that rotate at the disc face table.

5, last slice beam is before upset, be shaped as down parabola shaped, fist stage concrete in the above, centroid position has moved on the girder steel state, has promptly increased the unstability of beam.Therefore, upset disk and beam body are lowerd as far as possible, and braking and anti-dumping measure will be arranged when overturning simultaneously.

6, in the switching process, along with the not same-action of gravity in structural change, different distortion will take place in different phase in the distortion during the preflex beam upset, therefore, also will keep the scalability of beam during upset.

7, consider that the span of compound beam is big, lateral stiffness is little, and the stability when increasing upset is set up support bar and used to do to reinforce in preflex beam.

8, upset center of gravity control.Turning device is provided with three at 0.13L and 1/2L place, and three upset circle disk centers draw a straight line.Regulate the position of rotating disk central sill, make preflex beam barycenter 5～10cm on the upset disc centre, make when upset, preflex beam produces moment of torsion by the self gravitation effect and rotates, after 180 ° of upsets, the pre-bending center of gravity is positioned under the center of circle, makes overall structure be in stable state simultaneously.

9, owing to the action of gravity when overturning, the preflex beam amount of deflection changes, and when rotating to 0～90 °, the amount of deflection direction is consistent with gravity direction, and because of gravity reduces the frange plate metamorphosis, amount of deflection reduces; When rotating to 90 °, web produces amount of deflection under the deadweight effect, and the support in the turning device of span centre at this moment will prevent that the lateral deformation of web amount of deflection is excessive; When rotating to 90 °～180 °, amount of deflection direction and gravity direction are opposite, and amount of deflection reduces.So the fulcrum in the turning device should be able to keep beam along the axis direction Free Transform.

When 10, overturning, by the omnidistance observation of transit, the reading on the control upset disk, when three rotating disk deviations surpass lattice (5mm), stop immediately and adjust three rotating disks to sync bit, this moment is if occur significantly asynchronous, support bar will have part to come off, the beam body destruction that easily twists.

Claims (2)

1, a kind of preflex beam upset dish, it is characterized in that comprising semicircular top rotary table (1) and isodiametric semicircular lower rotary table (3) with it, upper and lower rotating disk connects by connecting bolt (2), the upset disk activity is installed on the base (5), base (5) top is rolling bearing (4) fixedly, and base (5) bottom is connected with rigid foundation (8) by built-in fitting (7).

2, preflex beam upset dish according to claim 1 is characterized in that the position that top rotary table (1), lower rotary table (3) contact with beam body (9) is provided with hardwood (6).

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