Laminated board thickness control device and use method, fabricated laminated board manufacturing process

Abstract

The application provides a laminated slab thickness control device, which comprises a first slab thickness controller and a second slab thickness controller, the first slab thickness controller comprises a base and a leveling rod, the base is used for fixing a bottom form plate arranged between two adjacent prefabricated slabs, the base is provided with a fixed hole with internal threads, one end of the leveling rod is threadedly connected to the fixed hole, and the other end of the leveling rod is provided with a rotating handle, the leveling rod is vertically arranged, and a plane where a lower edge of the rotating handle is located is a first pouring stop surface; the second slab thickness controller is a clamp, a clamping end of the clamp is used for clamping a truss rib on an upper surface of the prefabricated slab, and the clamp is in a vertical state when clamping, and the clamp is provided with a second pouring stop surface at a position close to a top portion. The application further provides a use method of the laminated slab thickness control device and a fabricated laminated slab manufacturing process, and the scheme provided by the application can accurately control the pouring thickness of the floor concrete and effectively solves the common problem of over-thickness of the laminated slab construction.

Description

Technical Field

[0001] This invention relates to the field of prefabricated structure engineering construction technology, and in particular to a composite slab thickness control device and its usage method, as well as a prefabricated composite slab manufacturing process. Background Technology

[0002] Composite floor slabs are widely used in prefabricated building construction. A composite floor slab is a prefabricated floor slab composed of precast slabs and a cast-in-place reinforced concrete layer. The precast slab is both a component of the floor slab structure and a permanent formwork for the cast-in-place composite layer, which can also accommodate embedded electrical conduits. The commonly used reinforced concrete composite slab has a precast slab thickness of 60mm and a cast-in-place concrete layer thickness of 70mm. A 300mm wide, separate cast-in-place joint is used between the precast slabs, designed as a two-way slab. To ensure the integrity of the floor slab and meet the requirements for transferring horizontal loads, the reinforcing bars within the precast slab extend into the supports at the slab ends and comply with the structural requirements for the longitudinal reinforcement of the bottom of the cast-in-place slab.

[0003] During actual construction, after the composite floor layer was poured and the formwork was removed, structural testing revealed that the composite slabs were generally too thick. The theoretical thickness of the composite slab = design value of precast slab thickness 60mm + height of concealed pipelines and reinforcing bars + thickness of reinforcing bar protective layer = 130mm. The actual thickness of the composite slab consists of the following components:

[0004] (1) Actual thickness of precast slab;

[0005] (2) Required thickness for electrical wiring;

[0006] (3) Required thickness for reinforcement arrangement;

[0007] (4) Gaps between reinforcing bars, pipelines, and precast base slabs;

[0008] (5) Actual thickness of the concrete cover for reinforcing bars.

[0009] Based on on-site investigation, the main reasons for the excessive thickness of the composite slab are as follows:

[0010] 1. Thickness deviation exists during the fabrication of precast slabs.

[0011] The standard requires that the allowable deviation of the precast slab thickness be ±5mm. However, due to the lack of strict control over the production process of the precast component factory or the lack of meticulous acceptance of the components upon arrival at the site, as well as the roughness and unevenness of the top surface of the slab after roughening, the actual thickness of the precast slab in some cases exceeds 65mm. In addition, the lack of strict control over the height of the embedded truss reinforcement during the component production process has led to the truss reinforcement floating upwards, which has also had an adverse effect on the overall thickness of the composite slab.

[0012] 2. The space occupied by concealed electrical wiring conduits

[0013] Electrical installation regulations stipulate that "only two layers of conduits are allowed to cross at the same location, and three or more layers are not permitted." When laying conduits, they are installed according to the lighting plan. This often results in double-layer conduits crossing at concentrated areas, and sometimes even overlapping with reinforcing steel bars. Generally, concealed high-voltage electrical conduits are 20mm diameter PVC pipes, while main lines use 32mm diameter PVC pipes. In areas where main lines intersect with ordinary conduits in the cast-in-place concrete, the required conduit height increases, even encroaching on the space available for reinforcing steel bars.

[0014] 3. The space occupied by the floor reinforcement layout affects

[0015] The cast-in-place composite layer is equipped with structural reinforcement such as bottom reinforcement, support negative reinforcement, and negative reinforcement distribution reinforcement. Radial reinforcement is also required at the external corners of the structure. Crack-resistant steel mesh is required in areas with dense concealed conduits. Additional reinforcement is required at the bottom of the slab at the lightweight partition wall of the building. The overall reinforcement layout space requirement increases. Furthermore, because truss reinforcement is used to replace stirrup reinforcement, the support negative reinforcement, negative reinforcement distribution reinforcement, and crack-resistant steel mesh are all placed on the truss reinforcement. In areas with dense reinforcement, the reinforcement even encroaches on the concrete cover of the cast-in-place layer.

[0016] 4. Error accumulation

[0017] There are various errors in the various processes of composite slab construction, such as positive tolerance of precast slab thickness, positive tolerance of protective layer, and gaps between steel bars, pipelines and precast slabs. The accumulation of various errors is also one of the reasons for the excessive thickness of composite slabs, which is not conducive to effectively controlling the design thickness of composite slabs.

[0018] Due to deficiencies in design, production, and construction, excessively thick composite slabs have become a common problem in prefabricated buildings. Excessive thickness of composite slabs not only leads to significant material consumption and increased building load, but also directly results in excessive floor elevation and insufficient interior height, making it difficult for the building's structural quality to pass inspection.

[0019] Based on the analysis and demonstration of the main reasons for the excessive thickness of composite slabs, control measures should be taken in all aspects of composite slab construction, including design, production and construction. In addition to strengthening the process technology in terms of design optimization, control of precast slab production, and refined construction in component installation, effective construction measures should also be taken in the final stage of composite layer pouring to accurately control the thickness of floor concrete pouring and effectively solve the common problem of excessive thickness in composite slab construction. Summary of the Invention

[0020] The purpose of this invention is to provide a composite slab thickness control device and its usage method, as well as a prefabricated composite slab manufacturing process, to solve the problems existing in the prior art, accurately control the pouring thickness of floor concrete, and effectively solve the common problem of excessive thickness in composite slab construction.

[0021] To achieve the above objectives, the present invention provides the following solution:

[0022] This invention provides a composite plate thickness control device, comprising:

[0023] The first plate thickness controller includes a base and a leveling rod. The base is used to be fixedly installed on the bottom template between two adjacent precast slabs. The base is provided with a fixing hole with internal thread. One end of the leveling rod is threaded to the fixing hole, and the other end is provided with a rotating handle. The leveling rod is set vertically, and the plane where the lower edge of the rotating handle is located is the first pouring cut-off surface.

[0024] The second plate thickness controller is a clamp. The clamping end of the clamp is used to clamp the truss reinforcement on the upper surface of the precast slab. The clamp is in a vertical state when clamping. A second pouring stop surface is provided near the top of the clamp.

[0025] The first pouring cutoff surface and the second pouring cutoff surface are coplanar.

[0026] Preferably, the depth to which the leveling rod is screwed into the fixing hole is adjustable.

[0027] Preferably, the clamping end of the clamp is provided with a plurality of clamping grooves along the height direction, and the clamp can clamp the truss reinforcement using any one of the clamping grooves.

[0028] Preferably, the clamp includes two fixed clamping plates and a torsion spring, with the two fixed clamping plates connected by the torsion spring.

[0029] Preferably, the bottom of the base is provided with an outwardly extending annular flange, and the base is fixed to the bottom template by screws on the annular flange.

[0030] The present invention also provides a method of using the composite plate thickness control device as described above, comprising:

[0031] Before pouring the floor concrete, the first slab thickness controller is set on the bottom template between two adjacent precast slabs, and the second slab thickness controller is set on the truss reinforcement on the upper surface of the precast slab.

[0032] After the floor concrete is poured, the leveling rods and clamps are removed and reused during the second finishing process before the initial setting of the floor concrete, and the floor surface is smoothed.

[0033] Preferably, multiple first plate thickness controllers and multiple second plate thickness controllers are used each time. The multiple bases are all fixedly set on the centerline of the gap between two adjacent precast slabs and are arranged along the centerline. The distance between two adjacent bases is 0.8 to 1.2 m. The multiple second plate thickness controllers are arranged in a matrix. The distance between any two adjacent rows of second plate thickness controllers is 0.8 to 1.2 m. The distance between any two adjacent columns of second plate thickness controllers is 0.8 to 1.2 m.

[0034] The present invention also provides a manufacturing process for prefabricated composite panels, comprising:

[0035] Step 1: Erection of the formwork support system;

[0036] Step 2: Install the precast panels in place;

[0037] Step 3: Reinforcing steel tying and pipeline pre-embedding;

[0038] Step 4: Install the composite plate thickness control device as described above;

[0039] Step 5: Integral pouring of floor slab concrete;

[0040] Step 6: Disassemble the clamps and leveling rods.

[0041] The present invention achieves the following technical effects compared to the prior art:

[0042] The composite slab thickness control device provided by this invention has the characteristics of simple structure, convenient operation, strong versatility and high turnover rate. It can accurately control the structural thickness of prefabricated composite slab floors, effectively solve the common quality problem of excessive thickness in composite slab construction, prevent a large amount of material waste and increased building load, ensure that the floor elevation and indoor net height meet the design and specification requirements, and promote the overall quality improvement of prefabricated structure engineering.

[0043] Furthermore, the composite slab thickness control assembly is simple, and can be fabricated on-site or in a factory. On-site installation is easy and disassembly is quick, simplifying the construction process. The thickness of the composite slab can be controlled precisely to the millimeter, ensuring construction accuracy. Major components are reusable, reducing construction costs and saving significant expenses. This cost reduction also achieves energy conservation and environmental protection, fully complying with green building principles and possessing significant promotional value. Attached Figure Description

[0044] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0045] Figure 1 This is a schematic diagram of the installation of the composite plate thickness control device provided in Embodiment 1;

[0046] Figure 2 for Figure 1 Sectional view from direction 1-1;

[0047] Figure 3 This is a schematic diagram of the structure of the first plate thickness controller;

[0048] Figure 4 This is a cross-sectional view of the controller for the first plate thickness.

[0049] Figure 5 This is a schematic diagram of the second plate thickness controller.

[0050] Figure 6 This is a cross-sectional view of the second plate thickness controller;

[0051] In the diagram: 1-cast-in-place concrete; 2-precast slab; 3-bottom formwork; 4-first slab thickness controller; 5-top slab reinforcing steel; 6-truss reinforcement; 7-second slab thickness controller; 8-screw; 71-fixing clip; 72-torsion spring; 73-wedge handle; 41-leveling rod; 42-base; 43-rotating handle. Detailed Implementation

[0052] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0053] The purpose of this invention is to provide a composite slab thickness control device and its usage method, as well as a prefabricated composite slab manufacturing process, to solve the problems existing in the prior art, accurately control the pouring thickness of floor concrete, and effectively solve the common problem of excessive thickness in composite slab construction.

[0054] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0055] Example 1

[0056] This embodiment provides a composite plate thickness control device, such as... Figures 1-2 As shown, it includes: a first plate thickness controller 4 and a second plate thickness controller 7;

[0057] Among them, such as Figure 3 and Figure 4As shown, the first slab thickness controller 4 includes a base 42 and a leveling rod 41. The base 42 is fixedly installed on the bottom template 3 between two adjacent precast slabs 2. The base 42 is provided with a fixing hole with internal threads. One end of the leveling rod 41 is threaded to the fixing hole, and the other end is provided with a rotating handle 43. The leveling rod 41 is set vertically, and the plane where the lower edge of the rotating handle 43 is located is the first pouring cut-off surface. When pouring the floor, the lower edge of the rotating handle 43 is used as the basis for precise leveling, that is, the concrete height is poured to the first pouring cut-off surface during pouring. In a preferred embodiment, in order to achieve the purpose of adjusting the height of the cast-in-place concrete, the depth of the leveling rod 41 screwed into the fixing hole is adjustable, and the thread is a fine thread to facilitate precise adjustment of the height of the first pouring cut-off surface. In use, the height of the first pouring cut-off surface is adjusted by rotating the leveling rod 41 according to the design thickness of the composite slab.

[0058] like Figure 5 and Figure 6 As shown, the second plate thickness controller 7 is a clamp. The clamping end of the clamp is used to clamp the truss reinforcement 6 on the upper surface of the precast slab 2. The clamp is in a vertical state when clamping. A second pouring cut-off surface is provided near the top of the clamp, that is, the concrete is poured to the first pouring cut-off surface during pouring. In a preferred embodiment, the clamping end of the clamp is provided with multiple clamping grooves along the height direction. The clamp can use any one of the clamping grooves to clamp the truss reinforcement 6, so as to adjust the height of the second pouring cut-off surface.

[0059] After installation, it is necessary to ensure that the first pouring stop surface and the second pouring stop surface are coplanar.

[0060] Therefore, the composite slab thickness control device provided by the present invention has the characteristics of simple structure, convenient operation, strong versatility and high turnover rate. It can accurately control the structural thickness of prefabricated composite slab floors, effectively solve the common quality problem of excessive thickness in composite slab construction, prevent a large amount of material waste and increased building load, ensure that the floor elevation and indoor net height meet the design and specification requirements, and promote the overall quality improvement of prefabricated structure engineering.

[0061] Furthermore, the composite slab thickness control assembly is simple, and can be fabricated on-site or in a factory. On-site installation is easy and disassembly is quick, simplifying the construction process. The thickness of the composite slab can be controlled precisely to the millimeter, ensuring construction accuracy. Major components are reusable, reducing construction costs and saving significant expenses. This cost reduction also achieves energy conservation and environmental protection, fully complying with green building principles and possessing significant promotional value.

[0062] In some embodiments, the clamp includes two fixed clamping plates 71 and a torsion spring 72. The two fixed clamping plates 71 are connected by the torsion spring 72, and the two end feet of the torsion spring 72 are respectively inserted into the two fixed clamping plates 71. Correspondingly, the fixed clamping plates 71 are provided with foot holes for inserting the foot.

[0063] In some embodiments, the bottom of the base 42 is provided with an outwardly extending annular flange, and the base 42 is fixed to the bottom template 3 by screws 8 on the annular flange. The base 42 is fixed to the bottom template 3 by passing M3 self-tapping screws through the bolt holes on the annular flange, so that its positioning is accurate and stable, and prevents it from floating during the pouring of concrete at the joint of the slab.

[0064] Steps for manufacturing a composite slab thickness control device

[0065] The first plate thickness controller 4 is composed of a base 42 and a leveling rod 41, and is also composed of a fixing clip 71 and a torsion spring 72. The specific dimensions and manufacturing methods of each component are as follows:

[0066] (1) Make the base 42

[0067] The base 42 is made of PE material. The base 42 is cylindrical in shape with a diameter of 20mm and a height of 57mm. The fixing hole is opened from the top of the column and extends downward. The length of the fixing hole is 40mm and the wall thickness is 5mm. The lower solid column is 17mm high. A circular base plate is fixed at the bottom of the column. The circular base plate has a diameter of 40mm and a thickness of 3mm. Two bolt holes with a diameter of 3mm are drilled on both sides of the base plate.

[0068] (2) Make leveling rod 41

[0069] The leveling rod 41 uses an M10 screw with a length of 130mm and a bottom thread length of 40mm. The top is connected to a plum blossom-shaped rotating handle 43, which is 30mm high and painted with red reflective paint.

[0070] (3) First plate thickness controller 4

[0071] Screw the leveling rod 41 into the fixing hole on the base 42. Based on the design thickness of 130mm for the composite plate, rotate the plum blossom-shaped rotating handle 43 at the top of the leveling rod 41 to adjust the vertical height from the lower edge of the rotating handle 43 to the bottom surface of the base 42 to be the same as the design plate thickness.

[0072] (4) Making the fixing clip 71

[0073] The fixing clip 71 is made of PE material and consists of two symmetrical clips. The clip is 40mm wide, 15mm thick, and 70mm high. A wedge-shaped handle 73 is set on the upper part, which is 20mm wide and 35mm high. An 8mm diameter semi-circular hole is reserved 15mm from the top of the clip. A serrated anti-slip structure is set on the inner side of the clip. A 1mm diameter pin hole is drilled on the side of the clip.

[0074] (5) Make a torsion spring with a diameter of 8mm 72

[0075] The torsion spring 72 is made of spring steel wire with a diameter of 1mm, a length of 40mm and a diameter of 8mm. The steel wires at both ends extend symmetrically in a straight line and are then bent vertically.

[0076] (6) Second plate thickness controller 7

[0077] The inner sides of the two fixing clips 71 are joined together, and the 8mm diameter torsion spring 72 is embedded in the 8mm diameter combined round hole at the top of the clip. The bent sections of the steel wires at both ends of the torsion spring 72 are respectively inserted into the 1mm diameter pin holes drilled on the side of the clip.

[0078] Example 2

[0079] This embodiment provides a method for using the composite plate thickness control device as described in Embodiment 1, including:

[0080] Before pouring the floor concrete, the first slab thickness controller 4 is set on the bottom template 3 between two adjacent precast slabs 2, and the second slab thickness controller 7 is set on the truss reinforcement 6 on the upper surface of the precast slab 2.

[0081] After pouring the floor concrete, remove the leveling rod 41 and clamps for reuse during the second finishing process before the initial setting of the floor concrete, and smooth the floor surface.

[0082] The process involves pouring the floor concrete monolithically after the composite slab thickness control device is installed. The wall concrete is poured first, followed by the floor concrete. After vibration, the surface can be finished. The composite slab thickness control device is used for precise leveling during the finishing process. Construction workers should avoid stepping on or tripping over the thickness control device during pouring and finishing, and should also avoid direct impact from pumped concrete. After the floor surface is finished, it should be promptly covered with plastic film for curing, with a curing period of no less than 14 days.

[0083] During the second finishing process before the initial setting of the cast-in-place floor concrete, remove the leveling rod 41 and the clamps. Rotate to remove the leveling rod 41, pinch the wedge-shaped handle 73 at the top of the clamps to open the clamps and detach them from the truss reinforcement 6, then remove them vertically and smooth the concrete at the extraction point. After disassembly, collect all components promptly and clean the mortar for reuse.

[0084] In some embodiments, multiple first plate thickness controllers 4 and multiple second plate thickness controllers 7 are used each time. Multiple bases 42 are fixedly arranged on the centerline of the gap between two adjacent precast plates 2 and extend along the centerline. The distance between two adjacent bases 42 is 0.8 to 1.2 m, preferably 1 m. The multiple second plate thickness controllers 7 are arranged in a matrix. The distance between any two adjacent rows of second plate thickness controllers 7 is 0.8 to 1.2 m. The distance between any two adjacent columns of second plate thickness controllers 7 is 0.8 to 1.2 m, preferably 1 m.

[0085] Example 3

[0086] This embodiment provides a prefabricated composite panel manufacturing process, including:

[0087] Step 1: Erection of the formwork support system;

[0088] Step 2: Install precast slab 2 into place;

[0089] Step 3: Reinforcing steel tying and pipeline pre-embedding;

[0090] Step 4: Install the composite plate thickness control device as described in Example 1;

[0091] Step 5: Integral pouring of floor slab concrete;

[0092] Step 6: Disassemble the clamps and leveling rod 41.

[0093] Specific manufacturing process steps for prefabricated composite panels

[0094] (1) Erection of formwork support system

[0095] The entire floor concrete is poured in one go using an integral formwork process. The support system consists of frame uprights, adjusting screws, and main and secondary joists. Within the span of the composite slab, support uprights are erected from both sides of the cast-in-place slab joints, with a longitudinal and transverse spacing of 1500mm and a distance of ≤400mm from the wall. The uprights supported on the cast-in-place floor surface have 150mm side-length wooden formwork laid at the bottom, with the center of the pad arranged on the axis of the upright and in stable and close contact with the base layer to distribute the load. The top of the upright is initially adjusted for elevation using adjustable top supports.

[0096] Double steel pipe main keel is arranged in the adjustable top support at the top of the upright, followed by 50*80mm square timber secondary keel with a net spacing of no more than 200mm. The arrangement direction of the secondary keel should be perpendicular to the direction of the composite slab truss reinforcement. The elevation of the top surface of the formwork is accurately adjusted by using a level and string line to check, and leveling is achieved by adjusting the top support screw.

[0097] (2) Precast slab 2 is installed in place

[0098] The positioning lines of the precast slab 2 are marked on the formwork, and then the precast slab 2 is installed. The lifting equipment is pre-tested for safety. The lifting points are located on the truss bars 6 at both ends of the precast slab 2. Red paint is applied to the lifting points before leaving the factory. Chain slings are used for four-point balanced lifting, and the slab is lifted into place with reference to the positioning lines on the formwork.

[0099] The hoisting of precast slab 2 adopts a slow start, fast lift, and gentle lowering operation. The slings and the truss reinforcement 6 of precast slab 2 are secured with shackles to ensure the smooth lifting of precast slab 2. The line of action of the resultant force at the lifting point coincides with the center of gravity of the component, and the horizontal angle between the slings and the hook should not be less than 45°. When the slings are lifted to 500mm from the ground, pause briefly to reconfirm the security of the lifting equipment, and then continue lifting closer to the installation work surface. When the slings are 200mm from the support surface, pause again, and the operator stabilizes the precast slab 2, directing the tower crane to slowly lower it into place according to the positioning lines on the formwork. Only after the precast slab 2 is in place and stable can the hook be removed and the slings adjusted.

[0100] After the precast slab 2 is installed, it is inspected and corrected using a plumb line and a straightedge. If it exceeds the quality control requirements, or if the deviation affects the hoisting of the next slab, it should be hoisted and placed again until it meets the requirements. The bottom elevation of the slab is adjusted by fine-tuning the support frame, with an allowable deviation of ±5mm.

[0101] (3) Floor reinforcement binding and pipeline pre-embedding

[0102] ①Beam reinforcement binding

[0103] The binding of beam reinforcement is different from that of normal frame beams. The reserved reinforcement bars around the precast slab 2 extend into both sides of the beam. Therefore, the beam reinforcement bars need to be bound after the precast slab 2 is installed. Using square timber crossbeams as temporary supports, the beam reinforcement bars are erected on the top of the precast slab 2 and bound into a reinforcement cage before the whole beam is lowered into the formwork.

[0104] ② Reinforcement binding of cast-in-place composite layer

[0105] Clean the debris on the precast slab 2, remove and clean the loose parts on the joint surface, and tie the cast-in-place composite layer steel mesh to the truss steel bars on the precast slab 2 according to the design spacing. The anchorage length extending into the support should meet the design requirements, and additional steel bars should be set at the joint of the cast-in-place slab.

[0106] When the diameter and spacing of the bottom reinforcement bars in adjacent bays are the same, they should be arranged as long as possible. At the junction of the negative reinforcement bars of the slab, the distribution bars should be tied below the truss reinforcement bars 6 of the composite slab to avoid the cross-section of multiple layers of reinforcement bars, which would reduce the protective layer and affect the floor thickness and flatness. After the reinforcement bars are tied, steel stirrups should be used as a pedestrian walkway to prevent the top slab reinforcement bars from being deformed by stepping on them.

[0107] ③Electrical wiring and junction box pre-embedding

[0108] The junction box is pre-installed according to the detailed design drawings during the fabrication of precast slab 2. A sleeve is led out from the junction box. After the beam reinforcement is tied, the pre-embedded electrical conduit in the cast-in-place composite layer is laid. The pre-embedded sleeve is used to extend the conduit. The conduit is run under the truss reinforcement 6 of precast slab 2 and secured with nylon cable ties. This not only protects the conduit from being stepped on and damaged, but also serves to position and fix it. The conduit is laid strictly according to the design, along the shortest direction, so that the route is straight and bends are reduced. More than two layers of pipelines are strictly prohibited from crossing or overlapping in the cast-in-place composite layer. Ensure that the concrete protective layer thickness of the conduit is not less than 20mm.

[0109] (4) Install the first plate thickness controller 4 and the second plate thickness controller 7.

[0110] The first slab thickness controller 4 is set on the bottom formwork at the joint of the two-way slab, with a longitudinal spacing of 1m. First, the bases 42 are arranged on the bottom formwork at the spacing. M3 self-tapping screws are passed through the bolt holes on the base plate of the base 42 to fix the base 42 to the bottom formwork, so that its positioning is accurate and stable and to prevent the concrete of the slab joint from floating up during the pouring. Then, the leveling rod is screwed into the threaded fixing hole on the base 42. According to the design thickness of the composite slab, the plum blossom-shaped handle at the top of the leveling bolt is rotated so that the vertical height from the bottom of the handle to the bottom formwork is the same as the design slab thickness. The bottom of the rotating handle serves as the basis for accurate leveling during the pouring of the floor.

[0111] The second slab thickness controller 7 is installed within the cast-in-place composite layer above the precast slab 2, with a longitudinal and transverse spacing of 1m. The second slab thickness controller 7 uses a fixing principle similar to clothespins. By holding the wedge-shaped handle 73 at the top and squeezing it firmly, the fixing clip 71 opens and inserts into the truss reinforcement 6 at the top of the precast slab 2, clamping the truss reinforcement 6 into the serrated groove on the inner side of the fixing clip 71. The serrated structure on the inner side of the clip prevents slippage between the clip and the truss reinforcement 6. The top of the fixing clip 71 is at the same elevation as the top surface of the cast-in-place layer, serving as a reference for precise leveling during floor pouring.

[0112] (5) Integral concrete pouring of the floor

[0113] After the slab thickness controller is installed, the floor concrete is poured as a whole. The wall concrete is poured first, followed by the floor concrete. After vibration, the surface can be finished. The slab thickness controller is used for precise leveling during finishing. Construction workers should avoid stepping on or tripping over the slab thickness controller during pouring and finishing, and should avoid direct impact from pumped concrete. The plum blossom-shaped handle of the first slab thickness controller (4) is painted with red reflective paint as a conspicuous marker for nighttime construction. After the floor surface is finished, it should be covered with plastic film for curing, with a curing period of no less than 14 days.

[0114] (6) Disassemble the first and second plate thickness controllers and reuse them.

[0115] During the second finishing process before the initial setting of the cast-in-place floor concrete, remove the slab thickness controller, rotate and remove the leveling rod 41 from the first slab thickness controller 4, pinch the wedge-shaped handle 73 at the top of the second slab thickness controller 7 to open the fixing clip 71 and detach it from the truss reinforcement 6, then remove it vertically and smooth the concrete surface of the removed part. After disassembly, collect all components in a timely manner and clean the mortar for reuse.

[0116] Specific examples have been used to illustrate the principles and implementation methods of this invention. The descriptions of the above embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A laminated board thickness control device characterized by: The application relates to a composite slab thickness control device. The first slab thickness controller comprises a base and a leveling rod, the base is used for fixing a bottom formwork arranged between two adjacent prefabricated slabs, a fixed hole with internal threads is arranged on the base, one end of the leveling rod is threadedly connected to the fixed hole, and the other end of the leveling rod is provided with a rotating handle; the leveling rod is vertically arranged, and the plane where the lower edge of the rotating handle is located is a first pouring stop surface. The second slab thickness controller is a clamp, the clamping end of the clamp is used for clamping a truss rib on the upper surface of a prefabricated slab, the clamp is in a vertical state when clamping, and a second pouring stop surface is arranged at the position close to the top of the clamp. The first pouring stop surface and the second pouring stop surface are coplanar; a plurality of clamping grooves are arranged on the clamping end of the clamp in the height direction, and the clamp can clamp the truss rib by using any one of the clamping grooves.

2. The laminated board thickness control device according to claim 1, characterized by: The depth of the leveling rod screwed into the fixed hole is adjustable.

3. The laminated board thickness control apparatus according to claim 1, characterized by: The clamp comprises two fixed clamping pieces and a torsion spring, and the two fixed clamping pieces are connected through the torsion spring.

4. The laminated board thickness control apparatus according to claim 1, characterized by: An annular flange extending outward is arranged at the bottom of the base, and the base is fixed on the bottom formwork by screwing on the annular flange.

5. A method of using the thickness control device for a laminated board according to any one of claims 1 to 4, characterized by: The application relates to a composite slab thickness control device. Before pouring floor concrete, the first slab thickness controller is arranged on the bottom formwork between two adjacent prefabricated slabs, and the second slab thickness controller is arranged on the truss rib on the upper surface of the prefabricated slab; After pouring the floor concrete, the leveling rod and the clamp are removed for reuse before the secondary surface collection of the floor concrete before initial setting of the floor concrete, and the floor surface is smoothed.

6. The method of using a laminated board thickness control device of claim 5, wherein: A plurality of the first slab thickness controllers and a plurality of the second slab thickness controllers are used each time, the plurality of bases are fixedly arranged on the center lines of the gaps between two adjacent prefabricated slabs and are arranged along the center lines, the spacing between two adjacent bases is 0.8-1.2 m, a plurality of the second slab thickness controllers are arranged in a matrix, the spacing between any two adjacent rows of the second slab thickness controllers is 0.8-1.2 m, and the spacing between any two adjacent columns of the second slab thickness controllers is 0.8-1.2 m.

7. A prefabricated laminated slab manufacturing process, characterized in that: The application relates to a composite slab thickness control device. Step one, erecting a formwork support system; Step two, installing prefabricated slabs in place; Step three, binding floor steel bars and pre-burying pipelines; Step four, installing the composite slab thickness control device according to any one of claims 1-4; Step five, pouring floor concrete as a whole; Step six, removing the clamp and the leveling rod.

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