JPH0612997U - Temporary support beam structure for concrete placing - Google Patents

Abstract

(57) [Summary] [Purpose] To provide a temporary support beam structure for concrete pouring, which can prevent the liner from being damaged when the receiving beam is cut and can adjust the slab receiving level. [Structure] A receiving beam 12 having a substantially U-shaped cross section in a direction orthogonal to the longitudinal direction, in which granular materials such as sand 13 are filled.
And a plurality of shims 14 that are divided by a predetermined length in the longitudinal direction, are supported by the granular material so as to project above the upper end of the receiving beam 12, and support the liner 5 that receives the pouring concrete on the upper surface thereof. Prepared

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a temporary support beam structure for placing concrete in a concrete reactor containment vessel.

[0002]

[Prior art]

 FIG. 4 is a sectional view of a concrete reactor containment vessel.

In the figure, 1 is a concrete storage container, 1 a is its top slab, 2 is a hatch provided at a predetermined position on both side surfaces thereof for allowing workers and various equipment to come in and out, and 3 is a storage container 1 The reactor pressure vessels 4 attached to the central portion are steel pressure-resistant covers that cover the upper surface of the reactor pressure vessel 3.

Generally, in a concrete reactor containment vessel, there is a risk that steam containing radioactivity may leak from the wall surface of the containment vessel 1 or water may seep out. Steel liner 5 is provided.

By the way, when forming the containment vessel 1, that is, when pouring (pouring) concrete, the top slab liner 5a, which receives the top slab 1a in particular, does not bend downward under the load of concrete. 5a is supported by a beam from below. Reference numeral 6 is a beam for supporting the top slab liner 5a in a form described later. 7 is in an upper dry well 8 formed above the inside of the containment vessel 1. The lower end is abutted on the diaphragm floor 9 or the upper stage of the workbench 10 having a plurality of floors, and the upper end of the beam 6 is received. The support beams are provided upright so as to come into contact with the lower surface, and an appropriate number of support beams are provided as necessary.

FIG. 5 is a sectional view taken along the line AA in FIG. 4, in which a large number of the receiving beams 6 are provided radially outward from the central reactor pressure vessel 3 side, and are slightly different from the liner 5. Leaving a gap. Auxiliary beams 11 are provided in a multi-layer structure between the adjacent receiving beams 6 and 6 in a direction substantially perpendicular to the receiving beams 6 and 6 over the entire circumference. Therefore, it has a cobweb-like beam structure as a whole.

FIG. 6 is an enlarged view of the contact portion between the top slab liner 5a and the receiving beam 6, and in the past, for example, the receiving beam 6 made of H-shaped steel was brought into contact with the top slab liner 5a and directly supported. .

After the concrete is poured into the top slab 1 a, the hatch 2 is opened to allow a worker to enter, and a cutting machine such as a gas cutting machine and supporting equipment for cutting are carried into the storage container 1 to receive the beam 6. Further, the auxiliary beam 11 and further the support beam 7 were cut into a size that can be carried out from the hatch 2, and the cut beam pieces were carried out from the hatch 2 to the outside.

[0009]

[Problems to be solved by the device]

 However, in the above-mentioned conventional temporary support beam structure for concrete pouring, since the receiving beam is in contact with the top slab liner, the top slab liner may be damaged when the receiving beam is cut. If the liner is scratched, there is a problem that the accuracy of preventing steam and water from leaking from the concrete decreases. Another problem is that it is difficult to adjust the level of the beam to the top slab liner because the underside of the liner is uneven.

The present invention solves the above-mentioned drawbacks of the prior art, prevents the liner from being damaged when the receiving beam is cut, and provides a temporary support beam structure for concrete pouring that can adjust the slab receiving level. The purpose is to do.

[0011]

[Means for Solving the Problems]

 The above-mentioned purpose is to divide the receiving beam, which has an open upper surface and is filled with sand or other granular material, into a predetermined length in the longitudinal direction of the receiving beam, and to project above the upper end of the receiving beam. And a plurality of shims supported on the granular material and supporting a liner on the upper surface of which is stretched on the lower surface of the cast concrete.

[0012]

[Action]

 Granules for load transfer and level adjustment are filled in a beam with an open top surface, and the granules are supported by shims that are cut in the longitudinal direction. Then, the upper surface of this shim supports the lower surface of the liner that receives the poured concrete. Since the upper surface of the shim protrudes above the upper end of the beam, the beam is not in contact with the liner, and there is a distance between them.

[0013]

【Example】

 Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a partial cross-sectional front view of a temporary support beam structure for concrete placing according to an embodiment in a direction orthogonal to the longitudinal direction, and FIG. 2 is a partial longitudinal cross-sectional front view of the same.

In these figures, 7 is a support beam, and 12 is a receiving beam placed on the upper end of the support beam 7 or fixed by bolts. As is clear from FIG. 1, the receiving beam 12 has a substantially U-shaped cross section in a direction orthogonal to the longitudinal direction, in other words, it is like a gutter, and inside the sand, it has a sand to a predetermined height. (Particulate matter) 13 is filled. Then, a shim 14 is placed on the sand 13. As is apparent from FIG. 2, the shim 14 is divided into a plurality of pieces in the longitudinal direction, and the plurality of shims 14 receive the top slub liner 5a.

A sufficient amount of sand 13 is put in the receiving beam 12 so that the upper surface of the shim 14 projects upward from the upper end of the receiving beam 12, and the top slab receiving member is adjusted by adjusting the amount of the sand 13. It is possible to make fine adjustments to the operating level later.

FIG. 3 is an explanatory view showing a state at the time of cutting work of the receiving beam after placing concrete.

First, the structure of the support device will be described. Reference numeral 15 is a trolley that moves on a platform (not shown) by wheels 16 and 16 provided on the front and rear bottoms inside the upper dry well 8, and 17 is a receiving portion of the dolly 15. A sand pan placed on the surface, 18 is two hollow lower supports fixed to the surface of the sand pan 17, 19 is a bolt provided toward the hollow portion of the lower support 18, and 20 is fitted to each lower support 18. They are two upper supports that can be vertically moved together, and a sliding slit 20a that is long in the vertical direction is formed in the substantially central portion. The bolt 19 is engaged with the slit 20a for sliding, and by tightening the bolt 19, the upper support 20 is positioned at a predetermined height. The upper surface of the upper support 20 supports the receiving beam 12, and gas cutting of the receiving beam 12 is performed in this state.

Next, the operation of the receiving beams 12 at the time of gas cutting will be described. With the receiving beams 12 supported by the two upper supports 20 in front of and behind the moving direction of the truck 15, in the vicinity of the outside of each upper support 20. The gas cutting point 12a of the receiving beam 12 is gas-cut to obtain a receiving beam piece 12b having a predetermined length L in the longitudinal direction. The size and size of the receiving beam piece 12b are set so that they can be carried out from the hatch 2 shown in FIG.

When the gas cutting work for obtaining one receiving beam piece 12 b is completed, the truck 15 is moved from right to left in the figure (or vice versa), and the same work is repeated up to the end of the receiving beam 12. To do.

By the way, the sand 13 inside is spilled by cutting the receiving beam 12, but since the spilled sand 13 is received and stored in the sand tray 17, it does not scatter to the outside. Further, since the shim 14 is finely divided from the beginning, it is not necessary to cut the shim 14 itself.

Since the receiving beam 12 is separated from the top slab liner 5a as described above during the gas cutting of the receiving beam 12 as described above, the receiving beam 12 can be cut without damaging the top slab liner 5a. .

When the cutting operation of the receiving beam 12 is completed, each receiving beam piece 12 b, the shim 14, the supporting device, and the like are carried out of the hatch 2 to the outside of the storage container 1.

In the embodiment of the present invention, the case where the cross-sectional shape of the receiving beam is substantially U-shaped has been described, but it is not limited to the U-shaped as long as the upper surface is open. Besides, it goes without saying that various changes can be made without departing from the scope of the present invention.

[0025]

[Effect of device]

 As described above, according to the present invention, the granular material is put in the receiving beam, the granular material is made to support the shim divided in the longitudinal direction, and the liner is supported by this shim, whereby the receiving beam and the liner are supported. Since the gap is formed between them, the liner is not affected when the receiving beam is cut, and the liner can be prevented from being damaged.

Further, the top slab receiving level can be finely adjusted by adjusting the amount of the particulate matter.

[Brief description of drawings]

FIG. 1 is a partial sectional front view of a temporary support beam structure for concrete placing according to an embodiment of the present invention in a direction orthogonal to the longitudinal direction.

FIG. 2 is a front view in longitudinal section of a temporary support beam structure for concrete placing according to an embodiment of the present invention.

FIG. 3 is an explanatory view showing a state at the time of a receiving beam cutting operation after placing concrete.

FIG. 4 is a cross-sectional view of a concrete reactor containment vessel.

5 is a cross-sectional view taken along the line AA of FIG.

FIG. 6 is an enlarged view of a contact portion between a top slab liner and a receiving beam.

[Explanation of symbols]

 5 Liner 5a Top Slab Liner 12 Receiving Beam 13 Sand (Granular Material) 14 Shim

Claims (1)

[Scope of utility model registration request] 1. A receiving beam having an upper surface opened and having a granular material such as sand filled inside, and a receiving beam divided into a predetermined length in the longitudinal direction of the receiving beam so as to project upward from the upper end of the receiving beam. A temporary support beam structure for concrete pouring, comprising: a plurality of shims supported by the granular material and supporting an upper surface of a liner stretched on a lower surface of the concrete.