A construction device for under-hanging cast-in-place slab of net rack under closed condition of upper chord roof panel

Abstract

The utility model provides a kind of upper chord roof panel under the net rack hanging cast-in-place slab construction device under closed condition, belong to closed construction technical field, the upper chord roof panel under the net rack hanging cast-in-place slab construction device of this utility model is characterized in that, including the support end large jig for net rack hovering, formwork assembly operating frame for construction operation, high-precision adjustable suspender for formwork fixed, and wood and precast concrete cushion block for reinforcing steel protection;Support end large jig height is higher than lower formwork and reinforcing steel operating frame, and height is adapted lower formwork assembly and personnel operating space requirement, support net rack hovering to provide formwork assembly space, simultaneously make net rack hanging I-beam and operating frame top keep the distance of adaptive personnel construction operation;High-precision adjustable suspender is bolted by lower clamping plate and formwork main keel, and upper is connected with net rack hanging I-beam through the U-shaped groove of C-shaped fastener, and C-shaped fastener and L-shaped clamping plate are locked by bolt;Wood is laid on formwork surface to protect formwork;It can solve the problem of material transportation difficulty and low operation efficiency in closed space, high-altitude operation safety risk, construction precision control difficulty, process connection is not smooth and leads to construction period delay.

Description

Technical Field

[0001] This utility model belongs to the field of enclosed construction technology, specifically, it relates to a construction device for hanging cast-in-place slabs under a space frame under the condition of enclosed upper chord roof panel. Background Technology

[0002] In roof structure construction, the construction sequence of first installing the upper chord roof concrete slab and then installing the cast-in-place slab under the space frame has gradually become the mainstream. However, the construction of the cast-in-place slab under the space frame with the upper chord roof panel closed faces multiple practical difficulties. These difficulties directly lead to low construction efficiency, prominent safety risks, and project delays, specifically in the following aspects: First, the working space is easily restricted, and the transportation of materials and personnel operations are difficult. After the upper chord roof panel is closed, a relatively enclosed space is formed between the roof and the lower space frame. If the space frame is lifted to the roof as a whole in the traditional way before constructing the cast-in-place slab formwork and reinforcement, the working surface within the enclosed space will be narrow. Materials (such as formwork, reinforcement, and hangers) need to be transported from limited entrances and exits to the high-altitude working surface. Not only is the transportation route tortuous, but the material accumulation due to space congestion is also prone to delay the construction progress. At the same time, when personnel are working at height in the enclosed space, their range of movement is limited, making it difficult to carry out multiple processes such as formwork assembly and reinforcement binding simultaneously, further reducing work efficiency.

[0003] Secondly, high-altitude operations pose significant safety risks and are difficult to protect against. The construction of cast-in-place slabs under a space frame requires tasks such as formwork fixing, rebar tying, and suspension rod installation to be completed at height. However, establishing a comprehensive safety protection system within an enclosed space is challenging. Firstly, traditional operating frames are often general-purpose structures, not designed for the specific scenarios of an enclosed upper chord and a space frame under the structure. For example, if the angle of the crossbars on the operating frame for sloping sections like the diffuser section does not match the inclination angle of the space frame, it can easily lead to instability for personnel, increasing the risk of falls from height. Secondly, if the supporting frame is not stable enough when the space frame is suspended, or if the connection structure between the formwork and the space frame (such as suspension rods) is loose, it can easily cause formwork to fall or objects to strike the site. Emergency response to accidents within an enclosed space is even more difficult and can lead to serious safety consequences. In summary, the construction sequence of first installing the upper chord roof and then hanging the cast-in-place slab under the space frame presents problems such as difficulty in transporting materials within an enclosed space, low work efficiency, high safety risks associated with high-altitude operations, difficulty in controlling construction precision, and delays due to poor workflow coordination. Utility Model Content

[0004] In view of this, the present invention provides a construction device for hanging cast-in-place slabs under a space frame under the closed condition of the upper chord roof panel, which can solve the problems of difficult material transportation and low operation efficiency in the closed space, high safety risks of high-altitude operation, difficulty in controlling construction accuracy, and delays in construction period caused by poor process connection.

[0005] This utility model is implemented as follows: This utility model provides a construction device for a space frame under a closed roof panel, comprising a large support frame for suspending the space frame, a formwork assembly frame for construction operations, a high-precision adjustable hanger for fixing the formwork, and wooden strips and precast concrete blocks for protecting the reinforcing bars. The large support frame is higher than the lower formwork and the reinforcing bar frame, and its height is adapted to the space requirements for lower formwork assembly and personnel operation. It supports the suspension of the space frame to provide space for formwork assembly, while maintaining a suitable distance between the I-beams under the space frame and the top of the frame for personnel operation. The high-precision adjustable hanger is bolted to the main keel of the formwork through the lower clamping plate, and connected to the I-beams under the space frame through the U-shaped groove of the C-type clamp. The C-type clamp and the L-type clamp are locked with bolts. Wooden strips are laid on the formwork surface to protect the formwork.

[0006] The technical effects of this utility model on the construction device for suspended cast-in-place slabs under a space frame under the closed condition of the upper chord roof panel are as follows: By setting up a large support frame at the support end to support the suspension of the space frame and reserving space for operation, the problem of materials being difficult to reach the working surface after the upper chord roof panel is closed is solved, and personnel can safely transport materials below; the use of high-precision adjustable rods with double connections, the lower clamping plate being bolted and the upper C-shaped clamps being locked, achieves stable fixation of the formwork, avoiding safety risks caused by formwork shaking during construction; the use of wooden strips and precast concrete pads for phased protection not only prevents the steel bars from damaging the formwork, but also ensures that the thickness of the steel bar protective layer meets the standards in the later stage; the overall construction of a safe construction system in the closed space is achieved, the suspension of the support frame creates working space to solve the problem of material transportation, the operating frame improves work efficiency, the stable connection of the rods reduces the risk of falling, and the enhanced protection measures reduce rework and delays in the construction period, comprehensively addressing the key and difficult points of construction, and solving the problems of difficult material transportation, low efficiency of high-altitude operations, high safety risks, and easy delays in the construction of cast-in-place slabs under a space frame after the upper chord roof panel is closed.

[0007] Based on the above technical solution, the construction device for hanging cast-in-place slabs under a space frame under the closed condition of the upper chord roof panel of this utility model can be further improved as follows: The large support frame is made of Q235 steel, and the top of the frame is equipped with an anti-slip pad with a thickness of 10mm to prevent the grid structure from sliding.

[0008] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the large support frame made of Q235 steel has high strength, and with the 10mm thick anti-slip pad, it can stably support the weight of the grid frame and prevent the grid frame from sliding, ensuring safety and reliability in the suspended state.

[0009] Furthermore, when the height of the uprights of the template assembly operation frame is greater than 1.5m, a horizontal crossbar is added in the middle of the uprights, and the crossbar is firmly connected to the uprights by a cross-shaped fastener.

[0010] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: when the height of the upright exceeds 1.5m, a horizontal crossbar is added in the middle. By increasing the connection points of the frame nodes, the overall stability of the template assembly operation frame is improved, and the frame swaying or tilting is avoided; the rigidity of the frame is strengthened, which solves the problem of insufficient stability when the height of the operation frame is large, thus solving the problem of the risk of falling from height and ensuring the safety of personnel operation.

[0011] Furthermore, the upper part of the high-precision adjustable boom is equipped with a PTFE plate, an upper washer, and double nuts. The PTFE plate is 5mm thick and is used to reduce frictional damage between the boom and the I-beams of the space frame.

[0012] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: by setting a polytetrafluoroethylene plate on the upper part of the high-precision adjustable rod, the friction between the rod and the I-beam of the space frame can be reduced, and the upper gasket and double nuts enhance the connection tightness, preventing the rod from loosening or wearing and breaking.

[0013] Furthermore, the spacing of the wooden strips corresponds to the binding points of the reinforcing bars on the formwork surface, ensuring that each reinforcing bar is supported by a wooden strip to prevent the reinforcing bars from directly contacting the formwork.

[0014] The beneficial effects of adopting the above-mentioned improvement scheme are: by laying wooden strips, each steel bar is supported, avoiding the steel bars directly pressing on the formwork and causing damage or deformation to the formwork.

[0015] Furthermore, the number of large support frames at the support ends is determined according to the span of the space frame, with one frame set every 6m to ensure that the space frame is evenly stressed when suspended.

[0016] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: setting large support frames at fixed intervals makes the weight of the space frame evenly distributed to each support frame, avoiding excessive local stress that could lead to deformation of the support frame or deflection of the space frame.

[0017] Furthermore, the operating platform area of ​​the template assembly operation frame shall not be less than 1.2 times the template area, in order to reserve space for material stacking and personnel operation.

[0018] Furthermore, the diameter of the high-precision adjustable hanger is 20mm, and the length of the hanger is adapted according to the distance between the I-beams hanging under the space frame and the template, ensuring that the adjustable range is not less than 100mm.

[0019] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: by setting a high-precision adjustable hanger with a diameter of 20mm, the strength is sufficient, and the adjustment range of more than 100mm can flexibly adapt to the changes in the distance between the space frame and the template, ensuring the accuracy of the template elevation.

[0020] Furthermore, the thickness of the precast concrete spacer is the same as the thickness of the concrete cover for the reinforcing bars, and the surface of the spacer is provided with grooves to fix the position of the reinforcing bars and prevent them from shifting.

[0021] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: by making the thickness of the precast concrete pad block consistent with the concrete cover of the steel reinforcement, and fixing the position of the steel reinforcement with the groove on the surface, the steel reinforcement is prevented from shifting and causing the concrete cover thickness to exceed the standard or the steel reinforcement to be exposed.

[0022] Furthermore, the U-shaped groove width of the C-type clamp is adapted to the diameter of the high-precision adjustable lifting rod, and the groove depth is not less than 20mm, ensuring that the lifting rod is stably clamped and not easily detached.

[0023] The beneficial effects of adopting the above-mentioned improvement scheme are as follows: the U-shaped groove width of the C-type clamp is adapted to the diameter of the hanger rod, and the groove depth of more than 20mm ensures that the hanger rod is firmly clamped, thus preventing the hanger rod from detaching from the clamp during construction and causing the formwork to fall.

[0024] Compared with existing technologies, the beneficial effects of this utility model's construction device for suspended cast-in-place slabs under a space frame in a closed roof panel environment are as follows: This utility model uses a large support frame at the support end to suspend the space frame, creating a suitable operating space. Materials can be directly delivered to the work surface, increasing transportation efficiency by over 40%. The formwork assembly operation frame is designed differently for inclined and flat sections, improving the ease of operation for personnel and increasing high-altitude work efficiency by 30%. The double connection structure of the high-precision adjustable suspension rod increases the formwork's fixing firmness by 50%, significantly reducing the risk of falls. The phased protection of wooden strips and precast concrete blocks reduces formwork damage and rebar displacement, lowering the rework rate by 60%. Overall, it achieves safe and efficient construction within a closed space, shortening the construction period by over 20%, while ensuring that the construction accuracy of the cast-in-place slab meets design requirements. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 A schematic diagram of a construction device for hanging cast-in-place slabs under a space frame under a closed roof panel; Figure 2 This is a schematic diagram showing the connection between the C-type clip and the L-type clamp. The attached diagram lists the components represented by each number as follows: 10. Large support frame at the support end; 11. Template assembly operating frame; 12. High-precision adjustable hanger; 13. Lower template; 14. Rebar operating frame; 15. Space frame; 16. C-type clamp; 17. U-shaped channel; 18. L-shaped clamp; 19. Anti-slip mat; 20. Polytetrafluoroethylene sheet; 21. Upper gasket; 22. Double nuts; 23. Wooden strip. Detailed Implementation

[0027] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings.

[0028] like Figure 1 Figure 2 shows an embodiment of a construction device for a space frame under a closed roof panel provided by this utility model. In this embodiment, it includes a large support frame 10 for suspending the space frame 15, a template assembly operation frame 11 for construction operations, a high-precision adjustable hanger 12 for fixing the template, and wooden strips 23 and precast concrete pads for protecting the reinforcing bars. The height of the large support frame is higher than that of the lower template and the reinforcing bar operation frame 14, and the height is adapted to the space requirements for lower template assembly and personnel operation. It supports the suspension of the space frame to provide space for template assembly, while maintaining a suitable distance between the I-beams under the space frame and the top of the operation frame for personnel operation. The high-precision adjustable hanger is bolted to the main keel of the template through the lower clamp 13, and connected to the I-beams under the space frame through the U-shaped groove 17 of the C-type clamp 16. The C-type clamp and the L-type clamp 18 are locked with bolts. Wooden strips are laid on the template surface to protect the template.

[0029] Preferably, the template assembly operation frame is a 48 series improved cross-shaped disc buckle frame, the spacing of the uprights meets the requirements of the frame's stress stability, the height of the uppermost horizontal bar of the inclined section (diffusion section) from the ground is adapted to the inclined surface construction requirements and is parallel to the tilt angle of the grid frame, and the height of the uppermost horizontal bar of the flat section (corner section) from the ground is adapted to the flat surface construction requirements and remains horizontal.

[0030] The wooden strips were designed to fit the requirements of rebar tying and formwork protection, and were later replaced with precast concrete blocks that matched the thickness of the rebar protective layer.

[0031] In the above technical solution, the large support frame is made of Q235 steel, and the top of the support frame is equipped with an anti-slip pad 19 with a thickness of 10mm to prevent the grid frame from sliding.

[0032] Furthermore, in the above technical solution, when the height of the uprights of the template assembly operation frame is greater than 1.5m, a horizontal crossbar is added in the middle of the uprights, and the crossbar is firmly connected to the uprights by a cross-shaped fastener.

[0033] Furthermore, in the above technical solution, a polytetrafluoroethylene plate 20, an upper gasket 21, and double nuts 22 are installed on the upper part of the high-precision adjustable rod. The polytetrafluoroethylene plate is 5mm thick and is used to reduce frictional damage between the rod and the I-beam of the space frame.

[0034] Furthermore, in the above technical solution, the spacing of the wooden strips corresponds to the binding points of the reinforcing bars on the formwork surface, ensuring that each reinforcing bar is supported by a wooden strip and avoiding direct contact between the reinforcing bars and the formwork.

[0035] Furthermore, in the above technical solution, the number of large support frames at the support end is determined according to the span of the space frame, with one frame set every 6m to ensure that the space frame is evenly stressed when suspended.

[0036] Furthermore, in the above technical solution, the operating platform area of ​​the template assembly operation frame is not less than 1.2 times the template area, which is used to reserve space for material stacking and personnel operation.

[0037] Furthermore, in the above technical solution, the diameter of the high-precision adjustable hanger is 20mm, and the length of the hanger is adapted according to the distance between the I-beams hanging under the space frame and the template, ensuring that the adjustable range is not less than 100mm.

[0038] Furthermore, in the above technical solution, the thickness of the precast concrete spacer is consistent with the thickness of the steel reinforcement protective layer, and the surface of the spacer is provided with grooves to fix the position of the steel reinforcement and prevent the steel reinforcement from shifting.

[0039] Furthermore, in the above technical solution, the width of the U-shaped groove of the C-type clamp is adapted to the diameter of the high-precision adjustable lifting rod, and the groove depth is not less than 20mm, to ensure that the lifting rod is stably clamped and not easily detached.

[0040] The method of using this utility model is as follows: When using it, a truck crane is used to lift the large support frame at the support end to the installation position marked on the ground, ensuring that the center line of the frame base coincides with the line of the layout, with a deviation of ≤3mm; adjust the verticality of the frame, and use a level to check the verticality of the frame's vertical support, with the deviation controlled within 1 / 1000 (i.e., a deviation of ≤1mm per 1m height). If there is a deviation, it is adjusted by placing a thin steel plate (2-5mm thick) under the frame base; according to the requirement of "6m interval, covering the support points of the grid structure", the remaining frames are installed in sequence, ensuring that the tops of all frames are on the same horizontal plane (horizontal deviation ≤2mm). After installation, the frame base is connected and fixed to the pre-embedded steel plate in the ground by spot welding to enhance the stability of the frame.

[0041] Using a truck crane, the I-beams are hoisted to the bottom of the space frame, ensuring a vertical connection between the I-beams and the space frame nodes. The connection method is either welding (weld height ≥ 8mm) or bolting (M24 bolts, tightening torque ≥ 40N・m), ensuring a secure connection. The levelness of the I-beams is adjusted using a level, with the deviation controlled within 3mm / m. If deviation exists, thin steel plates are placed at the connection points between the I-beams and the space frame to make adjustments. Simultaneously, ensure the spacing of the I-beams matches the space frame nodes (e.g., if the space frame node spacing is 3m, the I-beam spacing should also be 3m). After installation, the installation quality of the I-beams is inspected, including the appearance of the welds (no porosity, slag inclusions, cracks, or other defects) and the tightness of the bolts.

[0042] Assemble the template and operating frame below the jig; first install the flat section of the jig, then install the uprights, with 50×100mm square timber placed at the bottom of the uprights (to enhance stability), and set the spacing between the uprights according to the "meeting the stress requirements" (usually 1.5m×1.5m). Then install the horizontal crossbars, and connect the crossbars and uprights firmly with connecting plates and pins to ensure that the horizontal deviation of the crossbars is ≤2mm / m. Installation on the sloping section: Determine the inclination angle of the horizontal bars on the sloping section according to the inclination angle of the space frame (e.g., 30°). Use an angle gauge to check the angle of the horizontal bars, and control the deviation within ±1°. The connection method between the horizontal bars and the vertical bars is the same as that of the flat section. At the same time, ensure that the height of the uppermost horizontal bar from the ground is suitable for the sloping construction (e.g., the height of the uppermost horizontal bar from the ground is 1.8m, which is convenient for construction personnel to operate). Install the diagonal bars of the operating frame. The diagonal bars, vertical bars, and horizontal bars form a stable triangular structure to enhance the overall load-bearing capacity of the operating frame. The spacing between the diagonal bars is consistent with the spacing between the vertical bars, and the connection is firm. After installation, perform load-bearing capacity verification on the operating frame. Use a sandbag loading test to observe whether there is any deformation or displacement of the operating frame. If no abnormalities are found, the installation of the operating frame is qualified.

[0043] The main and secondary keels are laid above the operating frame. The main keel is made of 12# channel steel and is laid along the length of the operating frame at a spacing of 1.2m. The secondary keel is made of 50×100mm square timber and is laid perpendicular to the main keel at a spacing of 300mm. The main and secondary keels are connected by bolts of type M12 with a tightening torque of ≥20N・m to ensure that the "main and secondary keel node connection" is firm.

[0044] The template is laid on top of the main and secondary joists. The template is made of phenolic film-coated plywood. When laying the template, ensure that the surface of the template is flat and the gap between adjacent templates is ≤2mm. The gap is sealed with tape to prevent leakage of grout during subsequent concrete pouring. The template is connected to the secondary joists with self-tapping screws. The screws are sunk 1-2mm into the template surface to avoid protruding and affecting the flatness of the concrete surface.

[0045] After installation, use a level to check the levelness of the template surface, and control the deviation within 3mm / 2m. At the same time, check the stability of the template.

[0046] Place a 5mm thick polytetrafluoroethylene (PTFE) sheet on the lower flange surface of the I-beam under the space frame, ensuring that the PTFE sheet and the I-beam are in close contact without gaps. Attach the C-type clamp (opening upwards) to the lower flange of the I-beam. Insert the U-shaped groove of the C-type clamp into the boom. Adjust the position of the C-type clamp to make the boom vertical. Then cover the top of the C-type clamp with the L-type clamp and lock the L-type clamp and C-type clamp with M16 bolts. The bolt tightening torque is ≥30 N·m.

[0047] Wrap the metal clamp around the bottom of the 12# channel steel main keel and the hanger, adjust the position of the clamp to ensure that the hanger is vertically connected to the I-beam and the main keel, and use M16 bolts to bolt the clamp to the main keel. The bolt tightening torque is ≥30N・m.

[0048] According to the spacing requirements between the I-beam and the formwork, adjust the height of the hanger by rotating the double nuts (M20) of the hanger rod to ensure that the gap between the top of the hanger rod and the lower flange of the I-beam is ≤1mm (to ensure uniform force transmission), and at the same time ensure that the adjustable range of the hanger rod is ≥100mm; install the remaining high-precision adjustable hangers in sequence. After installation, check the verticality of the hangers (deviation ≤1mm / m) and the connection firmness. After passing the inspection, proceed to the next step of construction.

[0049] Finally, lay wooden strips on the template surface with a spacing of 1000×1000mm. When laying the strips, ensure that they are in close contact with the template surface. Fix the strips to the template with self-tapping screws, while avoiding the rebar tying points and leaving space for tying to avoid conflict with the wooden strips when tying the rebar later.

[0050] Before binding the reinforcing bars of the cast-in-place slab, precast spacers are laid on the surface of the formwork according to the requirements of the protective layer thickness. The spacers are spaced 1000mm×1000mm apart, and each spacer bears a uniform load to ensure that the protective layer thickness meets the design requirements after the reinforcing bars are bound.

[0051] Specifically, the principle of this utility model is as follows: The construction device first suspends the space frame using a large support frame, ensuring that the distance between the I-beams hanging below the space frame and the top of the operating frame is suitable for construction; then, the template assembly operating frame is erected according to the section type, with the horizontal bars of the inclined section parallel to the inclination angle of the space frame and the horizontal bars of the flat section horizontal, ensuring operational stability; subsequently, high-precision adjustable suspension rods connect the template and the space frame, the lower clamping plate fixes the keel, and the upper C-shaped clamps lock the I-beams, achieving precise positioning of the template; finally, wooden strips are laid to protect the template, and after the reinforcement is tied, they are replaced with precast concrete blocks. All components work together to form a construction system within a closed space, taking into account safety, efficiency, and precision.

Claims

1. A construction device for suspending cast-in-place slabs under a space frame under closed roof panels, characterized in that, This includes a large support frame for suspending the space frame, a formwork assembly frame for construction operations, high-precision adjustable hangers for fixing the formwork, and wooden strips and precast concrete blocks for protecting the reinforcing bars. The large support frame is higher than the lower formwork and reinforcing bar frame, and its height is adapted to the space requirements for lower formwork assembly and personnel operation. It supports the suspension of the space frame to provide space for formwork assembly, while maintaining a suitable distance between the I-beams hanging below the space frame and the top of the frame for personnel operation. The high-precision adjustable hangers are bolted to the main keel of the formwork through the lower clamping plate, and connected to the I-beams hanging below the space frame through the U-shaped groove of the C-type clamps. The C-type clamps and L-type clamping plates are locked with bolts. Wooden strips are laid on the formwork surface to protect the formwork.

2. The construction device for a space frame suspended from a cast-in-place slab under a closed roof panel as described in claim 1, characterized in that, The large support frame is made of Q235 steel, and the top of the frame is equipped with an anti-slip pad with a thickness of 10mm to prevent the grid frame from sliding.

3. The construction device for a space frame under a closed roof panel as described in claim 2, characterized in that, When the height of the uprights of the template assembly frame is greater than 1.5m, a horizontal bar is added in the middle of the uprights, and the horizontal bar is firmly connected to the uprights by a cross-shaped fastener.

4. The construction device for hanging cast-in-place slabs under a space frame under the closed condition of the upper chord roof panel as described in claim 3, characterized in that, The high-precision adjustable boom is equipped with a PTFE plate, an upper washer, and double nuts. The PTFE plate is 5mm thick and is used to reduce frictional damage between the boom and the I-beams of the space frame.

5. A construction device for a space frame under a closed roof panel as described in claim 4, characterized in that, The spacing of the wooden strips should correspond to the binding points of the reinforcing bars on the formwork surface to ensure that each reinforcing bar is supported by a wooden strip and to prevent the reinforcing bars from directly contacting the formwork.

6. A construction device for hanging cast-in-place slabs under a space frame under closed roof panel conditions, as described in claim 5, is characterized in that... The number of large support frames at the support end is determined according to the span of the space frame, with one frame set every 6m to ensure that the space frame is evenly stressed when it is suspended.

7. A construction device for a space frame under a closed roof panel as described in claim 6, characterized in that, The operating platform area of ​​the template assembly operation frame shall not be less than 1.2 times the template area, and shall be used to reserve space for material stacking and personnel operation.

8. A construction device for a space frame under a closed roof panel as described in claim 7, characterized in that, The high-precision adjustable hanger has a diameter of 20mm, and the length of the hanger is adapted to the distance between the I-beams hanging under the space frame and the template, ensuring that the adjustable range is not less than 100mm.

9. A construction device for a space frame under a closed roof panel as described in claim 8, characterized in that, The thickness of the precast concrete spacer is the same as the thickness of the concrete cover for the reinforcing bars. The surface of the spacer has grooves to fix the position of the reinforcing bars and prevent them from shifting.

10. A construction device for a space frame under a closed roof panel as described in claim 9, characterized in that, The U-shaped groove width of the C-type clamp is adapted to the diameter of the high-precision adjustable lifting rod, and the groove depth is not less than 20mm, ensuring that the lifting rod is stably clamped and not easy to fall off.

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