Demounting-free bottom die steel bar truss floor support plate bottom supporting steel keel and supporting structure

Abstract

The utility model discloses a dismounting-free bottom die steel bar truss floor support plate bottom support steel keel and a support structure, the steel keel comprises a steel keel, the two ends of the steel keel are respectively provided with a tenon mortise and a tenon mortise, the tenon mortise comprises two first rectangular pipes which are arranged in parallel and opposite, and the two first rectangular pipes are respectively provided with a plurality of second rectangular pipes. The tenon mortise comprises two parallel and opposite second rectangular pipes, and a plurality of connecting holes are distributed in the first rectangular pipes and the second rectangular pipes in the length direction of the first rectangular pipes and the second rectangular pipes, the structure is simple, production is easy, assembling and disassembling are easy in a tenon-and-mortise connection mode, and the supporting structure formed by connecting the steel keels is convenient to assemble and disassemble. The advantage that the steel bar truss floor support plate free of dismantling the bottom die is large in span and free of supporting is effectively exerted, and the purposes of saving materials and improving work efficiency are achieved.

Description

Technical Field

[0001] This utility model relates to the field of building structure technology, and in particular to a steel keel and support structure for the bottom support of a steel truss floor deck without the need for dismantling the bottom formwork. Background Technology

[0002] The proportion of prefabricated building area is increasing year by year. Currently, prefabricated floor slabs are the most widely used, among which steel truss floor slabs without the need for formwork removal are widely used due to their advantages such as light weight and minimal occupation of tower crane space. However, many projects still use full-span supported steel pipe scaffolding, and the bottom joists are made of conventional timber. This fails to take full advantage of the large span without support of the steel truss floor slabs without formwork removal. The numerous supports result in narrow construction passages, hindering the interleaving of subsequent construction processes and wasting timber, which does not meet the requirements of industrialized construction and green construction in my country. To address these shortcomings, prefabricated floor slab systems with fewer supports have emerged. To adapt to these systems and reduce timber usage, a new type of bottom support structure for the slab is urgently needed. Utility Model Content

[0003] In view of the shortcomings of the prior art, the technical problem to be solved by this utility model is to provide a bottom support steel keel and support structure for a steel truss floor deck that does not require dismantling of the bottom formwork, which solves the problems of complex support structure, large construction space occupation, and failure to give full play to the advantages of less support for steel truss floor decks that do not require dismantling of the bottom formwork.

[0004] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0005] A type of steel keel for bottom support of a steel truss floor deck slab that does not require dismantling of the bottom formwork includes a steel keel. Each end of the steel keel has a mortise and tenon joint and a mortise and tenon head. The mortise and tenon head includes two parallel and oppositely arranged first rectangular tubes, and the mortise and tenon joint includes two parallel and oppositely arranged second rectangular tubes. Multiple connecting holes are distributed along the length direction of the first and second rectangular tubes. The length direction of the first and second rectangular tubes is consistent with the length direction of the steel keel. When multiple steel keels are connected end-to-end in sequence, the first rectangular tubes of the steel keel can be inserted into the gap between two second rectangular tubes of adjacent steel keels, and the first and second rectangular tubes are in contact with each other. At least one connecting hole on the first rectangular tube is opposite to a connecting hole on the second rectangular tube.

[0006] As an optimization, the steel keel is an extension of the second rectangular tube, and the first rectangular tube is fixed between the two second rectangular tubes to form the mortise and tenon head. A connecting plate is also fixed between the two second rectangular tubes so that the ends of the two second rectangular tubes away from the mortise and tenon head form the mortise and tenon eye.

[0007] As an optimization, the connecting hole is a strip-shaped hole, and its length direction is consistent with the length direction of the steel keel.

[0008] Based on the aforementioned steel keel, this utility model also provides a bottom support structure for a steel truss floor deck that does not require dismantling of the bottom formwork, including a steel truss floor deck that does not require dismantling of the bottom formwork and a plurality of the aforementioned steel keels. The plurality of steel keels are connected end to end, and screws are inserted into at least a pair of opposite connecting holes of the connected steel keels to form support beams. A support beam is provided on each of the opposite sides of the floor deck, and the support beam is perpendicular to the steel truss of the floor deck. The opposite sides of the floor deck overlap the upper side of the support beam, and the lower side of the support beam is supported by a support frame.

[0009] As an optimization, the support frame includes a steel pipe scaffold, and an adjustable drag-support top plate is provided on the uprights of the steel pipe scaffold, with the support beam overlapping the adjustable drag-support top plate.

[0010] Compared with the prior art, this application has the following advantages:

[0011] This utility model,

[0012] 1. Steel keel replaces timber as the bottom support for the steel truss floor deck that does not require dismantling of the bottom formwork, greatly reducing the use of timber and meeting the requirements of green construction;

[0013] 2. Reduce scaffolding support and eliminate secondary joists to effectively leverage the advantages of the large span of the steel truss floor slab that does not require dismantling of the bottom formwork, thereby achieving the goals of saving materials and improving work efficiency;

[0014] 3. The steel keel adopts a male and female mortise and tenon joint, and the length of the connection between the tenon end and the mortise end of the keel can be adjusted. By matching steel keels of different lengths and specifications, the bottom support of floor slabs with different spans and different scaffolding support spacing can be realized. The length of the combined keel is adjustable and has a wide range of applications.

[0015] 4. The wider keel reduces the bending moment borne by the bottom formwork when the keel is located between the steel truss connectors, thereby reducing the stress on the bottom formwork and increasing the adaptability of the support system to steel truss floor decks with different connector spacings that do not require dismantling the bottom formwork.

[0016] 5. The keel is made of steel rectangular tubes and steel plates welded together. It is simple to manufacture, lightweight, easy to disassemble and assemble, and can be recycled and reused, thus reducing costs. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the main structure of the steel keel in this utility model;

[0018] Figure 2 This is a top view of the steel keel structure in this utility model;

[0019] Figure 3 This is a schematic diagram of the support structure in this utility model;

[0020] Figure 4 This is a schematic diagram of the connection and support of the steel keel in this utility model;

[0021] In the diagram, 1 is the steel keel, 2 is the first rectangular tube, 3 is the second rectangular tube, 4 is the connecting hole, 5 is the screw, 6 is the support frame, 7 is the adjustable support top plate, and 8 is the cantilever structure. Detailed Implementation

[0022] The present invention will now be described in further detail with reference to the accompanying drawings.

[0023] For specific implementation: see: Figures 1-4 ,

[0024] An embodiment provides a steel keel for bottom support of a steel truss floor slab that does not require dismantling of the bottom formwork. The steel keel 1 has mortise and tenon joints and tenon heads at both ends. Each tenon head includes two parallel and oppositely arranged first rectangular tubes 2, and each mortise and tenon joint includes two parallel and oppositely arranged second rectangular tubes 3. Multiple connecting holes 4 are distributed along the length of the first and second rectangular tubes 2 and 3. The length directions of the first and second rectangular tubes 2 and 3 are consistent with the length direction of the steel keel 1. When multiple steel keels 1 are connected end-to-end in sequence, the first rectangular tubes 2 of the steel keel 1 can be inserted into the gap between the two second rectangular tubes 3 of adjacent steel keels 1, and the first rectangular tubes 2 and 3 are in contact. At least one connecting hole 4 on the first rectangular tube 2 is opposite to a connecting hole 4 on the second rectangular tube 3.

[0025] In this embodiment, the steel keel 1 is equipped with male and female tenon and mortise keels of types 1400, 1100, 800, and 500, respectively, according to the commonly used horizontal bar distances of 600mm, 900mm, and 1200mm for steel pipe scaffolding. The lengths of the four types of keels are 1440mm, 1140mm, 840mm, and 500mm, respectively.

[0026] The steel keel 1 is an extension of the second rectangular tube 3. The first rectangular tube 2 is fixed between the two second rectangular tubes 3 to form the mortise and tenon head. A connecting plate is also fixed between the two second rectangular tubes 3 so that the ends of the two second rectangular tubes 3 away from the mortise and tenon head form the mortise and tenon eye.

[0027] The connecting hole 4 is a strip-shaped hole, and its length direction is consistent with the length direction of the steel keel 1, so as to facilitate adjustment.

[0028] Based on the aforementioned steel keel, this application also provides a bottom support structure for a steel truss floor deck that does not require dismantling of the bottom formwork, comprising a steel truss floor deck that does not require dismantling of the bottom formwork and a plurality of the aforementioned steel keels. The plurality of steel keels 1 are connected end to end, and at least one pair of opposite connecting holes 4 of the connected steel keels 1 are inserted with screws 5 to form support beams. A support beam is provided on each of the opposite sides of the floor deck, and the support beam is perpendicular to the steel truss of the floor deck. The opposite sides of the floor deck overlap the upper side of the support beam, and the lower side of the support beam is supported by a support frame 6.

[0029] The support frame 6 includes a steel pipe scaffold, and an adjustable support plate 7 is provided on the uprights of the steel pipe scaffold. The support beam is attached to the adjustable support plate 7 to perform the load-bearing work.

[0030] In this embodiment, the mortise and tenon joints and mortise holes have a 300mm adjustment space. By adjusting the joint length of the mortise and tenon joints and mortise holes, and inserting screws 5 in the joint area, the relative displacement of the two keels is restricted, while the combined keel forms a supporting beam, improving the load-bearing capacity. It should be noted that, except for the cantilever keel on the side of the slab which requires two screws 5, the other keels may not have screws 5 or only have one screw 5, depending on the situation. The cantilever structure 8 can be a separate keel structure or an extension of a longer keel. At the same time, the cross-sectional dimensions of the rectangular tubes that make up the keel can be selected according to the load transmitted by the steel truss floor slab of different non-removable bottom formwork, after verifying that the strength, stability and deformation of the keel meet the requirements.

[0031] During implementation, temporary supports for steel pipe scaffolding are erected. After the adjustable supports are installed, based on the floor slab span and support spacing, a central keel is first arranged vertically along the steel truss, with both ends of the central keel resting on the top plate of the adjustable supports. Another central keel is then arranged in the same way, with the mortise and tenon joints of the two keels connected end-to-end, and the mortise and tenon joint of one keel inserted into the mortise and tenon joint of the other keel. After the central keels are arranged, end keels are arranged at both ends of the slab side, with the mortise and tenon joints of the end keels inserted into the mortise and tenon joints of the central keels, or vice versa. The mortise and tenon joint lengths between each keel are adjusted to match the length of the entire row of keels with the floor slab span. This completes the arrangement of one row of keels forming a supporting beam. Based on the unsupported span of the steel truss floor slab without the need for formwork removal, one or more rows of keels are then arranged, thus completing the bottom support arrangement for one room's floor slab.

[0032] In summary, this utility model,

[0033] 1. Steel keel replaces timber as the bottom support for the steel truss floor deck that does not require dismantling of the bottom formwork, greatly reducing the use of timber and meeting the requirements of green construction;

[0034] 2. Reduce scaffolding support and eliminate secondary joists to effectively leverage the advantages of the large span of the steel truss floor slab that does not require dismantling of the bottom formwork, thereby achieving the goals of saving materials and improving work efficiency;

[0035] 3. The steel keel adopts a male and female mortise and tenon joint, and the length of the connection between the tenon end and the mortise end of the keel can be adjusted. By matching steel keels of different lengths and specifications, the bottom support of floor slabs with different spans and different scaffolding support spacing can be realized. The length of the combined keel is adjustable and has a wide range of applications.

[0036] 4. The wider keel reduces the bending moment borne by the bottom formwork when the keel is located between the steel truss connectors, thereby reducing the stress on the bottom formwork and increasing the adaptability of the support system to steel truss floor decks with different connector spacings that do not require dismantling the bottom formwork.

[0037] 5. The keel is made of steel rectangular tubes and steel plates welded together. It is simple to manufacture, lightweight, easy to disassemble and assemble, and can be recycled and reused, thus reducing costs.

[0038] Although embodiments of the present invention have been shown and described, those skilled in the art can make various changes, modifications, substitutions and alterations to these embodiments without departing from the principles and basis of the present invention. The scope of the present invention is defined by the appended claims and their equivalents. Therefore, the embodiments of the present invention are merely illustrative examples and do not constitute a limitation on the present invention in any way.

Claims

1. A bottom support steel joist for a non-removable bottom form steel rebar truss floor deck, characterized by, The steel keel comprises a tenon eye and a tenon head at two ends of the steel keel, wherein the tenon head comprises two first parallel and opposite rectangular tubes, the tenon eye comprises two second parallel and opposite rectangular tubes, and a plurality of connecting holes are distributed on the first and second rectangular tubes along the length direction of the first and second rectangular tubes; the length direction of the first and second rectangular tubes is consistent with the length direction of the steel keel; when a plurality of steel keels are connected in sequence, the first rectangular tube of the steel keel can be inserted into the space between the two second rectangular tubes of the adjacent steel keel, the first rectangular tube is in close contact with the second rectangular tube, and at least one connecting hole in the first rectangular tube is opposite to the connecting hole in the second rectangular tube.

2. The bottom support steel joist of the disassembly-free bottom die steel bar truss floor bottom support steel joist according to claim 1, characterized in that, The steel keel is formed by extending the second rectangular tube, the first rectangular tube is fixed between the two second rectangular tubes to form the tenon head, and a connecting plate is further fixed between the two second rectangular tubes to form the tenon eye at the end of the two second rectangular tubes away from the tenon head.

3. The bottom support steel joist of the disassembly-free bottom die steel bar truss floor bottom support steel joist according to claim 2, characterized in that, The connecting hole is a strip hole, and the length direction of the connecting hole is consistent with the length direction of the steel keel.

4. A bottom support structure of a removable form steel bar truss floor deck, comprising a removable form steel bar truss floor deck and a plurality of steel studs as claimed in any one of claims 1 to 3, characterized in that, A plurality of steel keels are connected in sequence, a screw rod is inserted into at least one pair of opposite connecting holes of the connected steel keels to form a support beam, one support beam is arranged on each of the opposite sides of the floor support plate, and the support beam is perpendicular to the steel bar truss of the floor support plate, wherein the opposite sides of the floor support plate are overlapped on the upper side of the support beam, and the lower side of the support beam is supported by a support frame.

5. The disassembly-free bottom die steel bar truss floor support structure according to claim 4, characterized in that, The support frame comprises a steel pipe scaffold, and an adjustable support top plate is arranged on the vertical rod of the steel pipe scaffold, and the support beam is overlapped on the adjustable support top plate.

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