A steel bar truss floor support plate under-embedded groove structure and construction method

Abstract

The application belongs to the field of building construction, and particularly relates to a steel bar truss floor support plate embedded groove structure and a construction method, wherein the structure comprises a top fixed rod, a vertical fixed part, a bottom fixed rod, a top support rod, a steel plate and a square frame. The square frame is distributed in an up-down mode, the upper and lower ends of the vertical fixed part are fixedly connected with the upper and lower square frames respectively, the side of the upper square frame is fixedly connected with a plurality of top fixed rods, the inner ring of the lower square frame is fixedly connected with a plurality of bottom fixed rods, the inner ring of the upper square frame is fixedly connected with a plurality of top support rods, the steel plate is arranged on the outer side of the vertical fixed part and the bottom fixed rod, and the top fixed rod is fixed with the floor plate. Compared with the traditional embedded groove formwork method, the application adopts a support-free formwork installation and reinforcement mode, and has the characteristics of simple construction, cost saving, engineering safety and easy quality guarantee.

Description

Technical Field

[0001] This invention relates to the field of building construction, specifically to a steel truss floor deck with an embedded groove structure and construction method. Background Technology

[0002] With the rapid development of steel structure buildings, the manufacturing process and application scope of steel truss floor decking have been continuously expanding, gradually becoming an important part of modern building construction. In my country, the application of steel truss floor decking started relatively late, but due to its advantages such as high structural strength, convenient construction, energy saving and environmental protection, and good fire resistance, it has been widely used in various industrial and civil buildings, especially high-rise, super high-rise buildings, and large commercial buildings.

[0003] With the increasing number of large-space buildings such as multi-story exhibition halls, airports, and conference centers in China, more and more steel truss floor slabs require embedded fire boxes and other equipment to meet the fire protection needs of these buildings. However, the traditional embedded groove structure for steel truss floor slabs in large spaces presents challenges such as the large height of the formwork support frame, the complexity of formwork installation and reinforcement procedures, cumbersome operation, and significant quality and safety risks.

[0004] Therefore, in order to solve the above-mentioned problems, a steel truss floor deck embedded groove structure and construction method were designed. Summary of the Invention

[0005] This invention addresses the problems mentioned above by designing a recessed groove structure and construction method for steel truss floor decking. Compared with the traditional recessed groove formwork method, this application adopts a support-free formwork installation and reinforcement mode, which has the characteristics of simple construction, cost saving, project safety, and easy quality assurance.

[0006] To achieve the above objectives, the present invention provides a recessed groove structure for a steel truss floor slab, comprising: a top fixing member, a vertical fixing member, a bottom fixing member, a top support member, a steel plate, and a square frame. There are two square frames, arranged vertically. The top and bottom ends of the vertical fixing member are fixedly connected to the upper and lower square frames, respectively. A plurality of top fixing members are fixedly connected to the side of the upper square frame. A plurality of bottom fixing members are fixedly connected to the inner ring of the lower square frame. A plurality of top support members are fixedly connected to the inner ring of the upper square frame. The steel plate covers the outside of the vertical fixing member and the bottom fixing member. The top fixing member is fixed to the floor slab.

[0007] Using the above method, a template frame is formed. The template frame is placed in the opening made in the floor slab, and concrete is poured into the template frame. After it is formed, it can be used as an area to place fire extinguisher boxes and other equipment.

[0008] Furthermore, it also includes an inner mold, which is disposed on the top support rod.

[0009] Furthermore, the inner mold is provided with a slot, a blocking plate, a fixing plate and screws. The side wall of the inner mold is provided with a slot of the same width as the top support rod. The top support rod is placed in the slot. The blocking plate is fixedly connected to the fixing plate. The blocking plate is slidably connected in the slot and located at the lower part of the top support rod. The fixing plate is fixedly connected to the inner mold by the screws.

[0010] In the above manner, the inner mold is installed by hoisting. First, the inner mold is positioned above the top support rod through the slot. Then, the blocking plate is installed below the slot. As the inner mold descends, the blocking plate is pushed up simultaneously. Finally, the inner mold is supported on the top support rod, and the blocking plate below is connected to the lower part of the top support rod.

[0011] Furthermore, it also includes a positioning device, which is detachably connected to the top support rod, and the two sides of the positioning device are respectively connected to the upper frame and the inner mold.

[0012] Furthermore, the positioning device includes a housing and a connecting rod. There are two housings, and the two ends of the connecting rod are respectively fixedly connected to the two housings. The housings are fastened to the top support rod and located on the side of the frame.

[0013] By using the above method, the outer casing is fastened to the top support rod next to the frame, and then the inner mold is installed next to the outer casing, thus controlling the installation position of the inner mold.

[0014] Furthermore, the steel plate is a galvanized steel plate.

[0015] This invention also discloses a construction method for a steel truss floor deck embedded groove structure, comprising the following steps: Step 1: Calculate the plane coordinates of the opening using the floor plan control points, use a GPS measuring instrument to locate and mark the four corners of the opening on site, then use an ink line to mark the edge line of the opening, and try to cut the galvanized base plate from bottom to top using a plasma cutting machine. Step 2: Manually install the standardized template frame in place using a small forklift; Step 3: Tie the reinforcing bars on the sides and ground of the formwork frame, according to the design requirements; Step 4: First, pour the bottom concrete of the formwork frame to form the concrete in one go, without leaving construction joints or cold joints. Use a chute to pour the concrete at the bottom, and gradually move from one side to the other. Use a vibrator during pouring to guide the flow and compact the concrete after pouring. Step 5: Before pouring concrete on the side, the formwork needs to be reinforced and verified to ensure that the strength meets the requirements. Then, the concrete is poured on the side. If the strength does not meet the requirements, the side formwork needs to be reinforced. Step 6: After the side formwork is reinforced, the inside of the formwork is cleaned manually with a blower to ensure that there are no debris. The contact surface between the new and old concrete is moistened with clean water. Before pouring the side wall concrete, the contact surface between the new and old concrete is moistened with pure cement slurry. The concrete is transported to the concrete pouring site by a concrete truck. The concrete truck transports the concrete to the pouring location through a chute. The concrete is manually poured into the formwork and then mechanically vibrated to form the concrete. Step 7: After the concrete for the formwork frame is poured, the concrete shall be cured with a film and felt within 12 hours, and the curing time shall not be less than seven days.

[0016] Furthermore, in step three, when tying the reinforcing bars, the tying of the side reinforcing bars must ensure the anchorage length of the reinforcing bars inserted into the bottom slab and the floor slab of the floor structure steel truss, and effective fixing and protection measures must be taken to ensure that the reinforcing bars do not shift or become contaminated by the concrete during the concrete pouring process.

[0017] Furthermore, in step five, before pouring, the construction joint of the side wall needs to be chiseled to remove the upper laitance layer and expose the concrete aggregate, ensuring that the joint is horizontal and straight. After chiseling, the reinforcing steel of the side wall is cleaned.

[0018] Furthermore, in step one, after the floor slab is cut, a reinforcing rib should be pre-set around the hole. The reinforcing rib is placed below the surface reinforcement, and the opening is sealed with a plug plate during cutting.

[0019] In summary, the steel truss floor deck slab embedded groove structure and construction method of the present invention have the following advantages and beneficial technical effects: 1. The embedded groove structure for reinforced steel truss floor decking of this invention is superior to traditional installation methods. Compared with the traditional embedded groove formwork method, this invention adopts a support-free formwork installation and reinforcement mode, which has the advantages of simple construction, cost saving, project safety, and easy quality assurance. 2. This invention is simple to construct, using a standardized template frame for direct installation, which solves the problems of complex procedures and cumbersome operations in traditional support and reinforcement methods; 3. This invention saves costs, requires no support during construction, is easy to install, reduces the difficulty of construction operations, and effectively reduces the input of turnover materials such as steel pipes and construction labor; 4. This invention eliminates high-altitude operations. The standardized template frame is entirely processed in the factory and installed on-site, thus eliminating high-altitude operations and reducing the risks of project safety management. 5. The quality of this invention is easy to guarantee. The integrated template frame solves the problem of poor adhesion between the steel truss floor deck and the groove vertical template in the traditional support and reinforcement method, which easily leads to grout leakage during concrete pouring. Attached Figure Description

[0020] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a structural schematic diagram of a steel truss floor deck embedded groove structure according to the present invention; Figure 2 This is a schematic diagram of the structure of the steel truss floor deck embedded groove structure after casting according to the present invention; Figure 3 This is a bottom view of a steel truss floor deck embedded groove structure according to the present invention; Figure 4 This is a schematic diagram of the embedded groove structure and blocking plate of the steel truss floor deck of the present invention; Figure 5 This is a schematic diagram of the positioning device in this invention.

[0021] The reference numerals in the attached figures are: 1-Top fixing rod; 2-Vertical fixing member; 3-Bottom fixing rod; 4-Top support rod; 5-Steel plate; 6-Square frame; 7-Inner mold; 71-Slot; 72-Blocking plate; 73-Fixing plate; 74-Screw; 8-Positioning device; 81-Casing; 82-Connecting rod; 9-Pouring section. Detailed Implementation

[0022] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of the embodiments of this invention will be described in more detail below with reference to the accompanying drawings. In the drawings, the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout; the described embodiments are some embodiments of this invention, but not all embodiments; the embodiments and directional terms described below with reference to the accompanying drawings are exemplary and intended to explain this invention, and should not be construed as limiting this invention; all other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention. The parts and equipment all adopt conventional models in the prior art, and the circuit connections adopt conventional connection methods in the prior art, which will not be described in detail here. Contents not described in detail in this specification belong to the prior art known to those skilled in the art. The embodiments of this invention will be described in detail below with reference to the accompanying drawings: like Figure 1 , Figure 2 and Figure 3 As shown, it includes: a top fixing rod 1, a vertical fixing rod 2, a bottom fixing rod 3, a top support rod 4, a steel plate 5, and a square frame 6. There are two square frames 6, which are distributed vertically. The top and bottom ends of the vertical fixing rod 2 are fixedly connected to the upper and lower square frames 6, respectively. Several top fixing rods 1 are fixedly connected to the side of the upper square frame 6. Several bottom fixing rods 3 are fixedly connected to the inner circle of the lower square frame 6. Several top support rods 4 are fixedly connected to the inner circle of the upper square frame 6. The steel plate 5 is wrapped around the outside of the vertical fixing rod 2 and the bottom fixing rod 3. The top fixing rod 1 is fixed to the floor slab. The top fixing rod 1, vertical fixing rod 2, bottom fixing rod 3, top support rod 4 and square frame 6 are all fixed by tungsten inert gas welding to form a template skeleton. The steel plate 5 is made of galvanized steel plate. The galvanized steel plate 5 is fixed to the vertical fixing rod 2 and the bottom fixing rod 3 by large brim pop rivets. The parts of the steel plate 5 that contact the square frame 6 are also fixed by large brim pop rivets at intervals.

[0023] like Figure 1 , Figure 2 , Figure 3 and Figure 4 As shown, the inner mold 7 is provided with a slot 71, a blocking plate 72, a fixing plate 73, and screws 74. A slot 71, the same width as the top support rod 4, is opened on the side wall of the inner mold 7. The top support rod 4 is placed in the slot 71. The blocking plate 72 and the fixing plate 73 are integrally formed. The blocking plate 72 is slidably connected in the slot 71 and located below the top support rod 4. The fixing plate 73 is fixedly connected to the inner mold 7 by screws 74. The inner mold 7 is installed by hoisting. First, the inner mold 7 is positioned above the top support rod 4 through the slot 71 for positioning. Then, the blocking plate 72 is installed below the slot 71. During the descent of the inner mold 7, the blocking plate 72 is simultaneously pushed upwards. Finally, the inner mold 7 is supported on the top support rod 4, and the lower blocking plate 72 abuts against the lower part of the top support rod 4. Finally, the fixing plate 73 is fixed to the inner mold 7 by screws 74.

[0024] like Figure 1 , Figure 3 and Figure 5 As shown, it also includes a positioning device 8, which is detachably connected to the top support rod 4. The two sides of the positioning device 8 are respectively connected to the upper frame 6 and the inner mold 7.

[0025] like Figure 5 As shown, the positioning device 8 includes a housing 81 and a connecting rod 82. There are two housings 81. The two ends of the connecting rod 82 are fixedly connected to the two housings 81 by welding. The housings 81 are fastened to the top support rod 4 and are located on the side of the frame 6.

[0026] Design parameters of the formwork frame: Based on the required equipment dimensions to be installed in the recessed groove, A (length) mm × B (width) mm × H (height) mm. Considering the installation space requirements, the length and width of each side of the structural groove are increased by 50 mm, and the depth is increased by 60 mm. The adjusted dimensions of the structural groove are (A+100) mm × (B+100) mm × (H+60) mm. Considering the floor slab thickness C (mm), and the side length D (mm) of the standardized formwork frame stainless steel square tube, the dimensions of the standardized formwork frame are (A+2C+2D+100) mm × (B+2C+2D+100) mm × (H+D+60) mm.

[0027] 30mm×30mm×2mm square steel pipes are used as the fixing rods in the template frame. The factory welding method adopts tungsten inert gas welding. This method can not only fully ensure good penetration at the root of the steel pipe and good weld formation, but also improve the plasticity and toughness of the root weld, reduce welding stress, thereby avoiding root cracks. Defects such as incomplete penetration, slag inclusion and porosity are not easy to occur during welding. Steel plate 5 is made of 0.5mm thick galvanized steel plate and is fixed to the square steel pipe with M6×16@150mm large cap pop rivets.

[0028] This application also discloses a construction method for a steel truss floor slab with an embedded groove structure, including the following steps: Step 1: Calculate the plane coordinates of the opening using the floor plan control points, use a GPS measuring instrument to locate and mark the four corners of the opening on site, then use an ink line to mark the edge line of the opening, and try to cut the galvanized base plate from bottom to top using a plasma cutting machine. Step 2: Manually install the standardized template frame in place using a small forklift; Step 3: Tie the reinforcing bars on the sides and ground of the formwork frame, according to the design requirements; Step 4: First, pour the bottom concrete of the formwork frame to form the concrete in one go, without leaving construction joints or cold joints. Use a chute to pour the concrete at the bottom, and gradually move from one side to the other. Use a vibrator during pouring to guide the flow and compact the concrete after pouring. Step 5: Before pouring concrete on the side, the formwork needs to be reinforced and verified to ensure that the strength meets the requirements. Then, the concrete is poured on the side. If the strength does not meet the requirements, the side formwork needs to be reinforced. Step 6: After the side formwork is reinforced, the inside of the formwork is cleaned manually with a blower to ensure that there are no debris. The contact surface between the new and old concrete is moistened with clean water. Before pouring the side wall concrete, the contact surface between the new and old concrete is moistened with pure cement slurry. The concrete is transported to the concrete pouring site by a concrete truck. The concrete truck transports the concrete to the pouring location through a chute. The concrete is manually poured into the formwork and then mechanically vibrated to form the concrete. Step 7: After the concrete for the formwork frame is poured, the concrete shall be cured with a film and felt within 12 hours, and the curing time shall not be less than seven days.

[0029] In step three, when tying the reinforcing bars, the side reinforcing bars must be tied in a way that ensures the anchorage length of the reinforcing bars inserted into the bottom slab and the floor slab of the floor slab structural steel truss. Effective fixing and protection measures should be taken to ensure that the reinforcing bars do not shift or become contaminated by the concrete during the concrete pouring process.

[0030] In step five, before pouring, the construction joint of the side wall needs to be chiseled to remove the upper laitance layer and expose the concrete aggregate, ensuring that the joint is horizontal and straight. After chiseling, the side wall reinforcement is cleaned.

[0031] In step one, after the floor slab is cut, a reinforcing rib should be pre-set around the hole. The reinforcing rib should be placed below the surface reinforcement. When cutting, the opening should be sealed with a plug plate.

[0032] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, and not to limit them. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A recessed groove structure under a steel truss floor slab, characterized in that, include: The structure includes a top fixing rod (1), a vertical fixing rod (2), a bottom fixing rod (3), a top support rod (4), a steel plate (5), and a square frame (6). There are two square frames (6), which are arranged vertically. The top and bottom ends of the vertical fixing rod (2) are fixedly connected to the upper and lower square frames (6), respectively. Several top fixing rods (1) are fixedly connected to the side of the upper square frame (6), several bottom fixing rods (3) are fixedly connected to the inner circle of the lower square frame (6), and several top support rods (4) are fixedly connected to the inner circle of the upper square frame (6). The steel plate (5) covers the outside of the vertical fixing rod (2) and the bottom fixing rod (3), and the top fixing rod (1) is fixed to the floor slab. It also includes an inner mold (7), which is disposed on the top support rod (4); The inner mold (7) is provided with a slot (71), a blocking plate (72), a fixing plate (73) and screws (74). The side wall of the inner mold (7) is provided with a slot (71) of the same width as the top support rod (4). The top support rod (4) is placed in the slot (71). The blocking plate (72) is fixedly connected to the fixing plate (73). The blocking plate (72) is slidably connected in the slot (71) and located at the lower part of the top support rod (4). The fixing plate (73) is fixedly connected to the inner mold (7) by the screws (74). It also includes a positioning device (8), which is detachably connected to the top support rod (4). The two sides of the positioning device (8) are respectively connected to the upper frame (6) and the inner mold (7).

2. The embedded groove structure under a steel truss floor slab according to claim 1, characterized in that, The positioning device (8) includes a housing (81) and a connecting rod (82). There are two housings (81). The two ends of the connecting rod (82) are fixedly connected to the two housings (81) respectively. The housings (81) are fastened to the top support rod (4) and located on the side of the frame (6).

3. The embedded groove structure under a steel truss floor slab according to claim 1, characterized in that, The steel plate (5) is a galvanized steel plate.

4. The construction method of the under-groove structure of the steel truss floor slab according to claim 1, characterized in that, Includes the following steps: Step 1: Calculate the plane coordinates of the opening using the floor plan control points, use a GPS measuring instrument to locate and mark the four corners of the opening on site, then use an ink line to mark the edge line of the opening, and try to cut the galvanized base plate from bottom to top using a plasma cutting machine. Step 2: Manually install the standardized template frame in place using a small forklift; Step 3: Tie the reinforcing bars on the sides and ground of the formwork frame, according to the design requirements; Step 4: First, pour the bottom concrete of the formwork frame to form the concrete in one go, without leaving construction joints or cold joints. Use a chute to pour the concrete at the bottom, and gradually move from one side to the other. Use a vibrator during pouring to guide the flow and compact the concrete after pouring. Step 5: Before pouring concrete on the side, the formwork needs to be reinforced and verified to ensure that the strength meets the requirements. Then, the concrete is poured on the side. If the strength does not meet the requirements, the side formwork needs to be reinforced. Step 6: After the side formwork is reinforced, the inside of the formwork is cleaned manually with a blower to ensure that there are no debris. The contact surface between the new and old concrete is moistened with clean water. Before pouring the side wall concrete, the contact surface between the new and old concrete is moistened with pure cement slurry. The concrete is transported to the concrete pouring site by a concrete truck. The concrete truck transports the concrete to the pouring location through a chute. The concrete is manually poured into the formwork and then mechanically vibrated to form the concrete. Step 7: After the concrete for the formwork frame is poured, the concrete shall be cured with a film and felt within 12 hours, and the curing time shall not be less than seven days.

5. The construction method of the embedded groove structure under the steel truss floor slab according to claim 4, characterized in that, In step three, when tying the reinforcing bars, the tying of the side reinforcing bars must ensure the anchorage length of the reinforcing bars inserted into the bottom slab and the floor slab of the floor structure steel truss, and effective fixing and protection measures must be taken to ensure that the reinforcing bars do not shift or become contaminated by the concrete during the concrete pouring process.

6. The construction method of the under-groove structure of the steel truss floor slab according to claim 4, characterized in that, In step five, before pouring, the construction joint of the side wall needs to be chiseled to remove the upper laitance layer and expose the concrete aggregate, ensuring that the joint is horizontal and straight. After chiseling, the reinforcing steel of the side wall needs to be cleaned.

7. The construction method of the under-groove structure of the steel truss floor slab according to claim 4, characterized in that, In step one, after the floor slab is cut, a reinforcing rib should be pre-set around the hole. The reinforcing rib is placed below the surface reinforcement. When cutting, the hole is sealed with a plug plate.

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