Prefabricated multi-rib plate

Abstract

The utility model relates to the technical field of building prefabricated slabs, in particular to a prefabricated multi-rib plate which comprises an upper flange, ribs and steel strands which are integrally formed, the ribs are perpendicularly connected to the lower side of the upper flange, and the multiple ribs are evenly distributed at intervals; the steel strands are arranged at the ends, away from the upper flange, of the ribs. According to the prefabricated multi-rib plate, the rib distance is increased, the rib height is increased, a lower flange is omitted, the aperture ratio reaches 55%-65%, and cost is saved; after the rib height is increased, the sectional inertia moment is increased, the bearing capacity of the component is improved, and deflection cracks are reduced; during pushing forming, the upper flange is located on the lower side of the prefabricated multi-rib plate, hole collapse of concrete is avoided in the pushing forming process, and it is only needed to guarantee that the rib beams stand by itself; the height H of each rib is 150-350 mm, the rib distance D between every two adjacent ribs is 200-300 mm, the requirement for the span within 10 m can be met, when the slope of the rib beam is smaller, the rib beam can be made higher, the rib distance can be made larger, and the requirement for the larger span is met.

Description

Technical Field

[0001] The utility model relates to the technical field of building prefabricated panels, in particular to a prefabricated multi-ribbed panel. Background Art

[0002] Buildings with cast-in-place structures use a lot of concrete and steel bars, and the amount of formwork and concrete wet work on site is quite large, with large investments, long construction periods, and serious noise and dust pollution. Compared with cast-in-place structures, prefabricated construction methods require a large number of concrete components to be produced indoors in factories, which are not affected by natural conditions. They are cast in steel formworks, have good maintenance conditions, can be operated around the clock, are easy to control in quality, and have high output. Prefabricated components are transported to the site for installation, which saves formwork and scaffolding, reduces dust, reduces labor intensity, reduces high-altitude work, shortens the construction period, and is civilized, with better comprehensive benefits.

[0003] As a major category of prefabricated buildings, floor prefabricated panels account for about one-third of the total structural concrete usage, so it is necessary to choose a prefabricated floor panel that can both reduce material usage and improve production efficiency. However, for multi-story industrial buildings, due to their large spans and large live loads on the floor, conventional prefabricated porous panels cannot meet the bearing capacity requirements, and the amount of concrete used is also large, which cannot effectively save costs.

[0004] The opening rate of conventional prefabricated porous plates (SP plates) is generally 40% to 50%. Figure 1 As shown, conventional prefabricated porous plates have upper and lower flanges, small rib spacing, low opening rate, large amount of concrete, and relatively high cost; and in order to ensure that the concrete does not collapse during the extrusion molding of the porous plate, the holes are narrow, the rib spacing is small, and the amount of concrete is large. Utility Model Content

[0005] The technical problem to be solved by the utility model is: to provide a prefabricated multi-ribbed plate in order to overcome the deficiencies in the prior art.

[0006] The technical solution adopted by the utility model to solve the technical problem is: a prefabricated multi-rib plate, including an integrally formed upper flange, ribs and steel strands,

[0007] The rib is vertically connected to the lower side of the upper flange, and the rib is provided with several ribs arranged evenly at intervals.

[0008] The height H of the ribs is 150-350 mm, and the rib distance D between adjacent ribs is 200-300 mm;

[0009] The steel strand is arranged at one end of the rib away from the upper flange.

[0010] Furthermore, during extrusion molding, the upper flange is located at the lower side of the prefabricated multi-ribbed plate;

[0011] When in use, the steel strands are located at the lower side of the prefabricated multi-ribbed plate, and the upper flange is located at the upper side of the multi-ribbed plate.

[0012] Furthermore, the connection between the rib and the upper flange is chamfered.

[0013] Furthermore, the height of the upper flange is ≥30 mm.

[0014] The beneficial effects of the utility model are as follows: the prefabricated multi-ribbed plate of the utility model increases the rib distance, increases the rib height, cancels the lower flange, and makes the opening rate reach 55%-65%, saving costs; after increasing the rib height, the cross-sectional inertia moment increases, the bearing capacity of the component is improved, and the deflection crack is reduced; during push-extrusion forming, the upper flange is located at the lower side of the prefabricated multi-ribbed plate, and the concrete will not collapse during the push-extrusion forming process, and it is only necessary to ensure that the rib beam is self-supporting; the rib height H is 150-350mm, and the rib distance D between adjacent ribs is 200-300mm, which can meet the span requirement within 10m, and when the rib beam slope is smaller, the rib beam can be made higher and the rib distance can be made larger to meet the requirement of a larger span. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0016] Figure 1 It is a cross-sectional schematic diagram of the conventional prefabricated porous plate;

[0017] Figure 2 is a cross-sectional schematic diagram of the utility model when in use;

[0018] Figure 3 It is a cross-sectional schematic diagram of the utility model during extrusion molding;

[0019] Figure 4 It is a structural schematic diagram of the turning clamp of the utility model;

[0020] Figure 5 It is a plan view of the production line of the utility model;

[0021] Figure 6 It is a side elevation schematic diagram of the utility model when it is lifted and reversed;

[0022] Figure 7 This utility model Figure 6 Bending moment diagram;

[0023] Figure 8It is a side elevation schematic diagram of the utility model when stacked and in use;

[0024] Fig. 9 This utility model Figure 8 Bending moment diagram.

[0025] Numbers in the figure: 1-upper flange, 2-rib, 3-steel strand, 4-I-beam, 5-clamp, 6-mold table, 7-tensioning base, 8-cutting line, 9-lifting point, 11-lower flange. DETAILED DESCRIPTION

[0026] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0027] Figure 2 A prefabricated multi-ribbed plate is shown, comprising an integrally formed upper flange 1, ribs 2 and steel strands 3, wherein the height of the upper flange 1 is ≥30 mm.

[0028] The rib 2 is vertically connected to the lower side of the upper flange 1, and the rib 2 is provided with several ribs arranged evenly at intervals.

[0029] The height H of rib 2 is 150-350mm, and the rib distance D between adjacent ribs 2 is 200-300mm, which can generally meet the span requirements within 10m. When the rib beam slope is smaller, the rib beam can be made higher and the rib distance can be made larger to meet the requirements of larger spans. After increasing the rib distance and rib height, the amount of concrete used is reduced; after increasing the rib height, the section inertia moment increases, the bearing capacity of the component is improved, and the deflection cracks are reduced.

[0030] The steel strand 3 is disposed at one end of the rib 2 away from the upper flange 1 .

[0031] The connection between the rib 2 and the upper flange 1 is chamfered.

[0032] During production, if Figure 5 As shown, the tensioned steel strands 3 are arranged between the two tensioning pedestals 7, and the extrusion molding machine runs between the two tensioning pedestals 7. Since the bottom of the production line is composed of a mold platform 6 composed of I-beams 4 and steel plates, the total length can be hundreds of meters, and the extrusion molding machine runs on it; after the steel strands 3 are tensioned on the tensioning pedestals 7 at both ends, the extrusion molding machine feeds and pushes out concrete to automatically form a prefabricated multi-ribbed plate; after the concrete strength reaches 80% of the design strength, the special cutting machine cuts the multi-ribbed plate into the required length along the cutting line 8.

[0033] like Figure 3 As shown, during push-extrusion molding, the upper flange 1 is located at the lower side of the prefabricated multi-ribbed plate. After the rib spacing is increased, in order to prevent the concrete from collapsing during push-extrusion molding, the upper flange 1 needs to be at the lower side during push-extrusion molding and be molded against the bottom template.

[0034] When in use, the steel strand 3 is located at the lower side of the prefabricated multi-ribbed plate, and the upper flange 1 is located at the upper side of the multi-ribbed plate. Figure 4 As shown, the prefabricated multi-ribbed plate needs to be turned over by a tool, specifically: an I-beam 4 is placed on the side of the prefabricated multi-ribbed plate close to the rib 2, corresponding to the position of the I-beams 4 on the lower side; and then the I-beams 4 on the upper and lower sides are clamped with a clamp 5.

[0035] like Figure 6 As shown, the upper and lower I-beams 4 of the multi-ribbed plate are set at about 1 / 3 of the length of a single plate, and the I-beams 4 are lifted, and the multi-ribbed plate is lifted into the air.

[0036] The lifting point 9 is set on the I-beam 4, and the bending moment is as follows Figure 7 As shown, the multi-ribbed plate has negative bending moment over its entire length, and the upper part is under tension. A steel strand 3 is arranged on the tension side, which can meet the bearing capacity requirements of the lifting stage. After the multi-ribbed plate is turned over, the resting point is at the end of the plate beam, as shown in Figure 8 As shown, a simply supported plate is formed. At this time, the bending moment is Fig. 9 As shown, the tension side is at the bottom, which is the side where the steel strand 3 is arranged, and can meet the bearing capacity requirements of the multi-ribbed plate in the laying stage and the use stage.

[0037] The present application utilizes the high efficiency of extrusion molding to produce prefabricated multi-ribbed plates. The cross-sectional shape is improved on the basis of the prefabricated porous plates, so that the physical and mechanical properties of the plate type are better, such as reducing material weight, increasing moment of inertia, improving bearing capacity, reducing deflection cracks, etc. Compared with conventional prefabricated porous plates, the main measures for improving the cross-sectional shape of the prefabricated multi-ribbed plates of the present application are to cancel the lower flange 11 of the porous plate, increase the rib spacing, and increase the rib height. In view of the improved cross-sectional shape, the present application has further improved the production method. After the extrusion molding is completed, special tools are needed to flip the prefabricated multi-ribbed plates from the production state to the use state according to the stress characteristics of different heights at the front and back.

[0038] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A prefabricated multi-ribbed slab, characterized in that: It comprises an upper flange (1), a rib (2) and a steel strand (3) which are integrally formed. The rib (2) is vertically connected to the lower side of the upper flange (1), and the rib (2) is provided with a plurality of ribs arranged at even intervals. The height H of the ribs (2) is 150-350 mm, and the rib distance D between adjacent ribs (2) is 200-300 mm; The steel strand (3) is arranged at one end of the rib (2) away from the upper flange (1).

2. The prefabricated multi-ribbed slab according to claim 1, characterized in that: During extrusion molding, the upper flange (1) is located at the lower side of the prefabricated multi-rib plate; When in use, the steel strands (3) are located on the lower side of the prefabricated multi-ribbed plate, and the upper flange (1) is located on the upper side of the multi-ribbed plate.

3. The prefabricated multi-ribbed slab according to claim 1, characterized in that: The connection between the rib (2) and the upper flange (1) is chamfered.

4. The prefabricated multi-ribbed slab according to claim 1, characterized in that: The height of the upper flange (1) is ≥30 mm.

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