An assembly tool type truss composite plate and construction method thereof

Abstract

A construction method for an assembly tool type truss composite plate includes sequentially manufacturing a shear steel support bracket, a support pole, a truss support beam, and a bottom plate; connecting and assembling the shear steel support bracket, the support pole, and the truss support beam; laying the truss support beam assembly on the longitudinal and transverse steel bars; pouring the prestressed composite plate concrete; installing the prestressed composite plate; pouring the second layer of composite concrete; and disassembling the truss support beam. The assembly tool type truss composite plate also includes a shear steel support bracket, a support pole, a truss support beam, and a bottom plate; the bottom of the shear steel support bracket of the assembly tool type truss composite plate has a bottom plate, and longitudinal and transverse bottom bars are arranged on the bottom plate. The bottom bars in the long side direction are prestressed bars, and the short side direction is non-prestressed bars. The shear steel support bracket is connected to the longitudinal and transverse bottom bars by binding.

Description

Technical Field

[0001] The invention belongs to the technical field of construction, and in particular relates to an assembly tool type truss composite plate, which is a support-free composite plate. Background Art

[0002] Traditional composite slab components frequently used in the construction field can reduce wet work steps and construction formwork during the construction process, thereby improving construction efficiency. The shortcomings of traditional composite slabs are low overall stiffness, poor bending resistance, easy cracking, large amount of steel bars, and a large number of bottom supports. The traditional reinforced truss composite slab structure produces large deflection deformation during the hoisting process, and may even cause the base plate to crack. During the construction of the composite layer, a large number of supports must be set at the bottom of the slab to increase the overall vertical bearing capacity of the composite slab, reduce the deflection of the base plate, and avoid cracking of the base plate. Therefore, the construction of traditional composite slabs requires a lot of manpower and material resources, resulting in a high overall construction cost.

[0003] The existing traditional reinforced truss composite slab consists of a prefabricated reinforced truss and a reinforced concrete base plate. When the reinforced concrete base plate is poured, the lower chord of the reinforced truss composed of the upper chord, the web and the lower chord is embedded to form an integral load-bearing composite slab component. The reinforced truss in the composite slab provides vertical stiffness when pouring the cast-in-place concrete of the composite layer, which can improve the bearing capacity of the composite slab during the construction process. The web connects the upper and lower chords to form a spatially stable structure and improves the shear resistance of the interface between the new and old concrete. After the concrete is poured, the reinforced truss is completely embedded in the concrete, resulting in excessive redundancy in the configuration of the floor slab steel bars, resulting in "waste" of steel bars, and increasing the comprehensive manufacturing cost of the composite slab components. Summary of the invention

[0004] The object of the present invention is to provide an assembly tool type truss composite plate and a construction method thereof, which can solve the deficiencies of the prior art.

[0005] The present invention provides an assembly tool type truss, which comprises a shear steel bar support, a support pole, and a truss support beam.

[0006] The shear steel support is composed of a first bent steel bar, a second bent steel bar, a third bent steel bar, and a vertical bar, and the shear steel support is in a triangular shape. During the construction of the on-site superimposed layer, the shear steel support and the supporting pole are mainly used to connect the superimposed slab concrete and the assembled tool-type truss support beam into a whole to form a truss structure, so that the superimposed slab has the ability to bear the construction load and the self-weight of the structure during the pouring of concrete, and provide stiffness guarantee when the overall strength does not meet the design requirements.

[0007] The first bent steel bar, the second bent steel bar and the third bent steel bar are triangular structures, the end of the first bent steel bar is welded and fixed to the tail of the third bent steel bar, and the tail of the third bent steel bar is connected to the vertical bar.

[0008] The angles between the first bent steel bar, the second bent steel bar and the third bent steel bar are 45-75 degrees, the vertical bar is perpendicular to the second bent steel bar, and the ends of the vertical bar are provided with threads;

[0009] The first bent steel bar, the second bent steel bar, the third bent steel bar and the vertical bar are integrally formed.

[0010] The support pole is an inverted T-shaped structure, which includes a horizontal pole and a vertical pole. The vertical pole is provided with a thread on the inner side, and a hole is opened in the horizontal direction at the bottom of the vertical pole. The horizontal pole passes through the hole and is welded and fixed at the intersection.

[0011] The present invention provides an assembly tool type truss, wherein the truss support beam is an assembly tool type structure, the truss support beam is a rectangular steel pipe, and a circular hole is set at the connection position with the shear steel bar support; the truss support beam is arranged in sections, and the truss support beams are connected by a socket and spigot manner.

[0012] The truss support beam is a rectangular steel pipe with a socket end at one end. The size of the socket end is slightly smaller than the inner diameter of the rectangular steel pipe, and a slope is provided at the end of the socket end to facilitate the socketing between the truss support beams. An ear plate is welded on the outside of the other end of the truss support beam, and a reliable connection between the truss support beams is ensured by knocking the ear plate.

[0013] The vertical reinforcement of the shear steel bar bracket is passed through the holes of the truss support beam and is tightened and fixed by nuts. Nut pads are set at the bending positions of the vertical reinforcement and the third bent reinforcement to ensure that the shear steel bar bracket is tightly combined with the truss support beam and is firmly connected.

[0014] The support upright is connected to the truss support beam via an extended screw rod, which can be screwed into the support upright, and the other end of the extended screw rod passes through the truss support beam and is tightened and fixed by a nut.

[0015] The present invention provides an assembly tool type truss composite plate, which comprises the above-mentioned shear-resistant steel bar bracket, a truss support beam, a support vertical pole, and a bottom plate.

[0016] There is a bottom plate at the bottom of the shear steel bar bracket, on which longitudinal and transverse bottom bars are arranged. The bottom bars in the long side direction are prestressed bars, and the bottom bars in the short side direction are non-prestressed bars. The shear steel bar bracket is connected to the longitudinal and transverse bottom bars by binding.

[0017] The entire first bent steel bar, the second bent steel bar, and part of the third bent steel bar of the shear steel bar support are buried in the bottom plate to form a certain anchoring length. After the bottom plate is processed, it forms a whole with the shear steel bar support.

[0018] The entire horizontal rod and part of the vertical rod of the support pole are buried in the base plate to form a certain anchoring length. After the base plate is processed, it forms a whole with the support pole. When pouring concrete on the construction site, the bolts are tightly connected, which can reduce the connection deformation of the assembled truss itself. The assembly rigidity is large and the deflection of the composite plate under load during construction is small.

[0019] A construction method for assembling a tool-type truss composite plate comprises the following steps:

[0020] Step 1: Fabrication of shear reinforcement support

[0021] A: According to the construction requirements, cut the steel bars with a diameter of 6-10mm;

[0022] B: Thread one end of the cut steel bar with a thread length of 30-50mm;

[0023] C: Bend the first bent steel bar, the second bent steel bar and the third bent steel bar continuously to form a triangular structure, and then bend the vertical bar. The vertical bar is perpendicular to the second bent steel bar. The first bent steel bar, the third bent steel bar and the vertical bar are welded and connected at the intersection.

[0024] Step 2: Making the support pole

[0025] A: Make horizontal rods according to construction requirements;

[0026] B: A thread is set inside the vertical pole, the thread depth is two-thirds of the length of the vertical pole, and a horizontal hole is set at the other end of the vertical pole;

[0027] C: The horizontal rod passes through the horizontal hole and is welded and fixed at the cross position;

[0028] Step 3: Make the truss support beam

[0029] A: The truss support beam is made of rectangular steel pipe, and holes are provided in the rectangular steel pipe corresponding to the support poles and shear steel support brackets;

[0030] B: Install the ear plate at the beginning of the truss support beam;

[0031] C: A socket is made at the end of the truss supporting beam, and the end of the socket is in a prism shape to facilitate the insertion of the truss supporting beam.

[0032] Step 4: Make the base

[0033] A: The production of the base plate is completed on the mold table. Before production, the templates are installed on the four sides of the base plate to control the size of the composite plate;

[0034] B: After installing multiple bottom plate formworks, lay the short side steel bars, then lay the long side full-length steel bars, use tensioning equipment to tension the full-length steel bars, and tie and connect the longitudinal and transverse steel bars.

[0035] Step 5: Connection combination of shear reinforcement bracket, support pole and truss support beam.

[0036] A: Assemble the truss support beams according to your needs.

[0037] B: Connect and fix the shear reinforcement bracket to the truss support beam through nuts and nut washers, and firmly connect the support pole to the truss support beam through nuts and extended bolts;

[0038] Step 6: Lay the truss support beam assembly on the longitudinal and transverse reinforcement

[0039] A: Place the shear reinforcement bracket, support pole and truss support beam assembly at the corresponding position as required, and connect the shear reinforcement bracket with the longitudinal and transverse reinforcements by binding;

[0040] Step 7: Prestressed composite slab concrete pouring

[0041] A: After the steel trusses and truss support beams are placed, concrete is poured with a thickness of 3.5-5cm. After the concrete pouring is completed, the upper surface is roughened.

[0042] B: After pouring concrete, the composite slab is cured. After reaching a certain strength, the prestressed steel bars are cut off and the formwork is removed. After reaching the lifting strength, the truss support beams are removed and the composite slab is transported to the yard or construction site. The truss support beams used in this step are only used to fix the position and elevation of the shear steel support brackets in the production of the composite slab. They do not bear the load during the construction process. They are different in specifications and function from the truss support beams used for on-site lifting and pouring of the concrete composite layer.

[0043] Step 8: Prestressed composite slab installation

[0044] A: Before installing the prestressed composite slab, install the truss support beam assembly to the composite slab and fix it. Then, hoist the composite slab to the corresponding position according to the position requirements of the drawing. Place the two ends of the composite slab on the structural beams on both sides.

[0045] B: After the composite slab is hoisted, tie the upper reinforcement of the composite slab;

[0046] Step 9: Pour the second layer of laminated concrete

[0047] After tying the upper steel bars, pour the second layer of composite concrete on the upper part. The concrete pouring height is 2-3cm from the bottom of the truss support beam.

[0048] Step 10: Remove the truss support beams

[0049] After pouring the upper concrete, the concrete surface is polished. When the concrete reaches a certain strength, the truss support beam is removed. When removing the truss support beam, the nuts are removed first, and then the truss support beam and the extension bolts are removed in turn. After the nuts, truss support beam and extension bolts are removed, the subsequent composite slab can be used.

[0050] The advantages of the present invention are: it can be processed in a streamlined manner on a production line, the bending strength of the composite plate components is improved, the rigidity is large, and it is not easy to produce excessive deflection and deformation; the amount of steel trusses used is small, saving a lot of steel; no bottom support frame needs to be set up during on-site construction, and the construction is convenient; the truss support beam can be removed after the concrete is poured and can be recycled. The above characteristics can reduce the processing and construction costs of the composite plate, and help promote the rapid and efficient development of the prefabricated industry. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] The present invention is further described below in conjunction with the accompanying drawings:

[0052] Attached Figure 1 It is a structural schematic diagram of the present invention.

[0053] Attached Figure 2 It is a front view of the present invention.

[0054] Attached Figure 3 It is a side view of the present invention.

[0055] Attached Figure 4 It is an enlarged view of the shear-resistant steel bar support node of the present invention.

[0056] Attached Figure 5 It is an enlarged view of the node of the supporting pole of the present invention.

[0057] Attached Figure 6 It is a partial schematic diagram of a truss support beam of the present invention.

[0058] Attached Figure 7 It is a structural schematic diagram of the support pole of the present invention.

[0059] Attached Figure 8 It is a structural schematic diagram of the shear-resistant steel bar support of the present invention.

[0060] In the picture

[0061] 1 is the bottom plate

[0062] 2 is the shear reinforcement support

[0063] 3 is the truss support beam

[0064] 4 is the support pole

[0065] 5 is prestressed tendon

[0066] 6 for nuts

[0067] 7 is an extension bolt.

[0068] 21 is the first bending steel bar

[0069] 22 is the second bent steel bar

[0070] 23 is the third bent steel bar

[0071] 24 is the vertical reinforcement

[0072] 25 is the nut spacer

[0073] 31 is the socket end

[0074] 32 for ear plate

[0075] 41 is the vertical pole

[0076] 42 is a horizontal rod. DETAILED DESCRIPTION

[0077] The following describes the embodiments of the present invention through specific examples, and those skilled in the art can easily understand other advantages and effects of the present invention from the contents disclosed in this specification. The present invention can also be implemented or applied through other different specific embodiments, and the details in this specification can also be modified or changed in various ways based on different viewpoints and applications without departing from the spirit of the present invention.

[0078] See also Figures 1 to 8 . It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings in this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change in the proportional relationship, or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. Changes or adjustments in their relative relationships should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0079] The present invention provides an assembly tool type truss, which comprises a shear steel bar support, a support pole, and a truss support beam.

[0080] The shear steel support is composed of a first bent steel bar, a second bent steel bar, a third bent steel bar, and a vertical bar, and the shear steel support is in a triangular shape. During the construction of the on-site superimposed layer, the shear steel support and the supporting pole are mainly used to connect the superimposed slab concrete and the assembled tool-type truss support beam into a whole to form a truss structure, so that the superimposed slab has the ability to bear the construction load and the self-weight of the structure during the pouring of concrete, and provide stiffness guarantee when the overall strength does not meet the design requirements.

[0081] The first bent steel bar, the second bent steel bar and the third bent steel bar are triangular structures, the end of the first bent steel bar is welded and fixed to the tail of the third bent steel bar, and the tail of the third bent steel bar is connected to the vertical bar.

[0082] The angles between the first bent steel bar, the second bent steel bar and the third bent steel bar are 45-75 degrees, the vertical bar is perpendicular to the second bent steel bar, and the ends of the vertical bar are provided with threads;

[0083] The first bent steel bar, the second bent steel bar, the third bent steel bar and the vertical bar are integrally formed.

[0084] The support pole is an inverted T-shaped structure, which includes a horizontal pole and a vertical pole. The vertical pole is provided with a thread on the inner side, and a hole is opened in the horizontal direction at the bottom of the vertical pole. The horizontal pole passes through the hole and is welded and fixed at the intersection.

[0085] The present invention provides an assembly tool type truss, wherein the truss support beam is an assembly tool type structure, the truss support beam is a rectangular steel pipe, and a circular hole is set at the connection position with the shear steel bar support; the truss support beam is arranged in sections, and the truss support beams are connected by a socket and spigot manner.

[0086] The truss support beam is a rectangular steel pipe with a socket end at one end. The size of the socket end is slightly smaller than the inner diameter of the rectangular steel pipe, and a slope is provided at the end of the socket end to facilitate the socketing between the truss support beams. An ear plate is welded on the outside of the other end of the truss support beam, and a reliable connection between the truss support beams is ensured by knocking the ear plate.

[0087] The vertical reinforcement of the shear steel bar bracket is passed through the holes of the truss support beam and is tightened and fixed by nuts. Nut pads are set at the bending positions of the vertical reinforcement and the third bent reinforcement to ensure that the shear steel bar bracket is tightly combined with the truss support beam and is firmly connected.

[0088] The support upright is connected to the truss support beam via an extended screw rod, which can be screwed into the support upright, and the other end of the extended screw rod passes through the truss support beam and is tightened and fixed by a nut.

[0089] The present invention provides an assembly tool type truss composite plate, which comprises the above-mentioned shear-resistant steel bar bracket, a truss support beam, a support vertical pole, and a bottom plate.

[0090] There is a bottom plate at the bottom of the shear steel bar bracket, on which longitudinal and transverse bottom bars are arranged. The bottom bars in the long side direction are prestressed bars, and the bottom bars in the short side direction are non-prestressed bars. The shear steel bar bracket is connected to the longitudinal and transverse bottom bars by binding.

[0091] The entire first bent steel bar, the second bent steel bar, and part of the third bent steel bar of the shear steel bar support are buried in the bottom plate to form a certain anchoring length. After the bottom plate is processed, it forms a whole with the shear steel bar support.

[0092] The entire horizontal rod and part of the vertical rod of the support pole are buried in the base plate to form a certain anchoring length. After the base plate is processed, it forms a whole with the support pole. When pouring concrete on the construction site, the bolts are tightly connected, which can reduce the connection deformation of the assembled truss itself. The assembly rigidity is large and the deflection of the composite plate under load during construction is small.

[0093] A construction method for assembling a tool-type truss composite plate comprises the following steps:

[0094] Step 1: Fabrication of shear reinforcement support

[0095] A: According to the construction requirements, cut the steel bars with a diameter of 6-10mm;

[0096] B: Thread one end of the cut steel bar with a thread length of 30-50mm;

[0097] C: Bend the first bent steel bar, the second bent steel bar and the third bent steel bar continuously to form a triangular structure, and then bend the vertical bar. The vertical bar is perpendicular to the second bent steel bar. The first bent steel bar, the third bent steel bar and the vertical bar are welded and connected at the intersection.

[0098] Step 2: Making the support pole

[0099] A: Make horizontal rods according to construction requirements;

[0100] B: A thread is set inside the vertical pole, the thread depth is two-thirds of the length of the vertical pole, and a horizontal hole is set at the other end of the vertical pole;

[0101] C: The horizontal rod passes through the horizontal hole and is welded and fixed at the cross position;

[0102] Step 3: Make the truss support beam

[0103] A: The truss support beam is made of rectangular steel pipe, and holes are provided in the rectangular steel pipe corresponding to the support poles and shear steel support brackets;

[0104] B: Install the ear plate at the beginning of the truss support beam;

[0105] C: A socket is made at the end of the truss supporting beam, and the end of the socket is in a prism shape to facilitate the insertion of the truss supporting beam.

[0106] Step 4: Make the base

[0107] A: The production of the base plate is completed on the mold table. Before production, the templates are installed on the four sides of the base plate to control the size of the composite plate;

[0108] B: After installing multiple bottom plate formworks, lay the short side steel bars, then lay the long side full-length steel bars, use tensioning equipment to tension the full-length steel bars, and tie and connect the longitudinal and transverse steel bars.

[0109] Step 5: Connection combination of shear reinforcement bracket, support pole and truss support beam.

[0110] A: Assemble the truss support beams according to your needs.

[0111] B: Connect and fix the shear reinforcement bracket to the truss support beam through nuts and nut washers, and firmly connect the support pole to the truss support beam through nuts and extended bolts;

[0112] Step 6: Lay the truss support beam assembly on the longitudinal and transverse reinforcement

[0113] A: Place the shear reinforcement bracket, support pole and truss support beam assembly at the corresponding position as required, and connect the shear reinforcement bracket with the longitudinal and transverse reinforcements by binding;

[0114] Step 7: Prestressed composite slab concrete pouring

[0115] A: After the steel trusses and truss support beams are placed, concrete is poured with a thickness of 3.5-5cm. After the concrete pouring is completed, the upper surface is roughened.

[0116] B: After pouring concrete, the composite slab is cured. After reaching a certain strength, the prestressed steel bars are cut off and the formwork is removed. After reaching the lifting strength, the truss support beams are removed and the composite slab is transported to the yard or construction site. The truss support beams used in this step are only used to fix the position and elevation of the shear steel support brackets in the production of the composite slab. They do not bear the load during the construction process. They are different in specifications and function from the truss support beams used for on-site lifting and pouring of the concrete composite layer.

[0117] Step 8: Prestressed composite slab installation

[0118] A: Before installing the prestressed composite slab, install the truss support beam assembly to the composite slab and fix it. Then, hoist the composite slab to the corresponding position according to the position requirements of the drawing. Place the two ends of the composite slab on the structural beams on both sides.

[0119] B: After the composite slab is hoisted, tie the upper reinforcement of the composite slab;

[0120] Step 9: Pour the second layer of laminated concrete

[0121] After tying the upper steel bars, pour the second layer of composite concrete on the upper part. The concrete pouring height is 2-3cm from the bottom of the truss support beam.

[0122] Step 10: Remove the truss support beams

[0123] After pouring the upper concrete, the concrete surface is polished. When the concrete reaches a certain strength, the truss support beam is removed. When removing the truss support beam, the nuts are removed first, and then the truss support beam and the extension bolts are removed in turn. After the nuts, truss support beam and extension bolts are removed, the subsequent composite slab can be used. Example

[0124] The main difference from Example 1 is that the structure of the truss support beam is a circular steel pipe, the shear steel bar bracket involved has a bottom plate at the bottom, longitudinal and transverse bottom bars are arranged on the bottom plate, the bottom bars in the long side direction are non-prestressed bars, and the bottom bars in the short side direction are non-prestressed bars, and the shear steel bar bracket is connected to the longitudinal and transverse bottom bars by binding.

[0125] The structure of the truss is not limited to rectangular steel pipes, and circular steel pipes may also be used. The material is not limited, and I-beams and channel steels may also be used. The structure of the connector is not limited to pins, threads, etc.

[0126] The above embodiments are merely illustrative of the principles and effects of the present invention, and are not intended to limit the present invention. Anyone familiar with the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by a person of ordinary skill in the art without departing from the spirit and technical concept disclosed by the present invention shall still be covered by the claims of the present invention.

Claims

1. A construction method for assembling a tool-type truss composite plate, characterized in that: The following steps are involved: Step 1: Fabrication of shear reinforcement support A: According to the construction requirements, cut the steel bars with a diameter of 6-10mm; B: Thread one end of the cut steel bar with a thread length of 30-50mm; C: Continuously bend the first bent steel bar, the second bent steel bar, and the third bent steel bar to form a triangular structure, and then bend the vertical bar, the vertical bar is perpendicular to the second bent steel bar, and the first bent steel bar, the third bent steel bar, and the vertical bar are welded and connected at the intersection; Step 2: Making the support pole A: Make horizontal rods according to construction requirements; B: A thread is set inside the vertical pole, the thread depth is two-thirds of the length of the vertical pole, and a horizontal hole is set at the other end of the vertical pole; C: The horizontal rod passes through the horizontal hole and is welded and fixed at the cross position; Step 3: Make the truss support beam A: The truss support beam is made of rectangular steel pipe, and holes are provided in the rectangular steel pipe corresponding to the support poles and shear steel support brackets; B: Install the ear plate at the beginning of the truss support beam; C: A socket is made at the end of the truss support beam, and the end of the socket is a prism shape to facilitate the insertion of the truss support beam; Step 4: Make the base A: The production of the base plate is completed on the mold table. Before production, the templates are installed on the four sides of the base plate to control the size of the composite plate; B: After installing multiple bottom plate templates, lay the short side steel bars, then lay the long side full-length steel bars, and use tensioning equipment to tension the full-length steel bars, and tie and link the longitudinal and transverse steel bars; Step 5: Connection combination of shear reinforcement bracket, support pole and truss support beam A: Assemble the truss support beams according to the needs; B: Connect and fix the shear reinforcement bracket to the truss support beam through nuts and nut washers, and firmly connect the support pole to the truss support beam through nuts and extended bolts; Step 6: Lay the truss support beam assembly on the longitudinal and transverse reinforcement A: Place the shear reinforcement bracket, support pole and truss support beam assembly at the corresponding position as required, and connect the shear reinforcement bracket with the longitudinal and transverse reinforcements by binding; Step 7: Prestressed composite slab concrete pouring A: After the steel truss and truss support beams are placed, concrete is poured with a thickness of 3.5-5cm. After the concrete pouring is completed, the upper surface is roughened; B: After pouring the concrete, the composite slab is cured. After reaching a certain strength, the prestressed steel bars are cut off and the formwork is removed. After reaching the lifting strength, the truss support beams are removed and the composite slab is transported to the yard or construction site. The truss support beams used in this step are only used to fix the position and elevation of the shear steel support brackets in the production of the composite slab, and do not bear the load during the construction process. The specifications and functions of the truss support beams used for on-site lifting and pouring of the concrete composite layer are different; Step 8: Prestressed composite slab installation A: Before installing the prestressed composite slab, install the truss support beam assembly to the composite slab and fix it, then hoist the composite slab to the corresponding position according to the position requirements of the drawing, and place the two ends of the composite slab on the structural beams on both sides; B: After the composite slab is hoisted, tie the upper reinforcement of the composite slab; Step 9: Pour the second layer of laminated concrete After tying the upper reinforcement, pour the second layer of upper composite concrete. The concrete pouring height is 2-3cm from the bottom of the truss support beam. After pouring the upper concrete, the concrete surface is polished. After the concrete reaches a certain strength, the truss support beam is removed. When removing the truss support beam, the nuts are removed first. After removing the nuts, the truss support beam and the extension bolts are removed in turn. After the nuts, truss support beam and extension bolts are removed, the subsequent composite slabs can be used.

Images