Laminated slab construction and installation method

Abstract

The invention discloses a laminated slab construction and installation method, and belongs to the technical field of fabricated buildings. The method comprises the following five steps of: deeply designing a laminated slab prefabricated part and a set-shaped steel template; mounting an internal reinforcing steel bar and an embedded part (one end of the reinforcing steel bar is a straight reinforcing steel bar, and the other end of the reinforcing steel bar is connected with a bolt sleeve through an end plate); producing and trial-assembling in a factory; mounting the prefabricated part on site (the straight reinforcing steel bar end is anchored into a beam support); the support beam is installed and connected with the bolt sleeve through the bolt elbow to fix the other end. The method solves the problems that in traditional construction, it is difficult to anchor the reinforcing steel bar on one side of the laminated slab into the support beam, and repeated adjustment is needed, operation is easy and convenient, the installation efficiency can be improved, the construction quality is guaranteed, and the method is suitable for prefabricated building laminated slab construction.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of prefabricated building construction, and particularly relates to a laminated slab construction and installation method. BACKGROUND

[0002] In the prefabricated building construction process, the laminated slab is first hoisted to the designed position, the steel bars at both ends of the laminated slab are anchored into the side support beams, and then the concrete is poured to form an integral floor slab. However, due to design problems and on-site construction process problems, the laminated slab is difficult to be normally installed in place during the on-site construction process. The steel bars at the positions of the side support beams are pre-bound to form a dense steel skeleton, and then the prefabricated laminated slab is hoisted. Therefore, the steel bars on one side of the laminated slab can be normally anchored into the side support beam, and the steel bars on the other side are difficult to be normally anchored into the support beam, which needs to be adjusted back and forth, and the construction difficulty is large, which affects the overall installation efficiency and construction quality. SUMMARY

[0003] The technical problem to be solved by the present application is to provide a laminated slab construction and installation method, which can optimize the design during the prefabricated laminated slab design and installation process, speed up the construction and installation efficiency, and ensure the overall construction quality. The method has the advantages of simple operation and high installation efficiency.

[0004] To solve the above technical problems, the technical scheme adopted by the present application is: A laminated slab construction and installation method, comprising the following steps: Step 1: deepening the design of the laminated slab prefabricated component, and designing and processing the shaped steel formwork; Step 2: installing the steel bars and embedded parts inside the laminated slab prefabricated component; Step 3: factory production trial assembly of the laminated slab prefabricated component; Step 4: on-site installation of the laminated slab prefabricated component; Step 5: installing the support beam of the laminated slab prefabricated component, and binding the upper face steel bars.

[0005] Preferably, in step 1, the original design file is deepened, the steel plate is purchased, and the bottom plate and the side steel plate are welded to form the shaped steel formwork according to the size required by the deepened design file, wherein the side steel plate needs to reserve the steel bar position, and the position of the embedded part is accurate.

[0006] Preferably, in step 2, the steel bars (including bottom bars and surface bars) and truss steel bars are cut, made and bound according to the requirements of the design document, to ensure that the steel bar types, specifications and spacing meet the design requirements; one end of the steel bar remains in the form of straight steel bar and is anchored, and the other end is welded with an end plate, the end plate is connected with one end of a bolt sleeve and the other end of the bolt sleeve is exposed to the section of the laminated slab, and the exposed end of the bolt sleeve is blocked with a rubber protection pad; other embedded parts in the slab are accurately positioned according to the design document.

[0007] Preferably, in step 3, after the steel bars and embedded parts in the shaped steel formwork are checked and found to be correct, the concrete is poured, and at the same time, the finished laminated slab is steam cured in the factory, and the formwork is removed after reaching the design age; the rubber protection pad is pulled out and the embedded hole is cleaned, and the bolt elbow is tested for connection with the embedded hole to verify the feasibility of installation; the above operation is repeated to produce laminated slab prefabricated components in batches in the factory.

[0008] Preferably, in step 4, after all laminated slab prefabricated components pass the factory inspection, they are transported to the installation site; according to the design number, the laminated slab is lifted to the designed position using lifting equipment, the straight steel bar at one end of the laminated slab is anchored into the corresponding beam support, the other end is placed in the beam support on the other side at the same time, and the plane position and elevation are adjusted; this step is repeated until the lifting of all laminated slabs is completed.

[0009] Preferably, in step 5, the rubber protection pad at the other end of the laminated slab is pulled out and the embedded hole is cleaned, the bolt elbow is installed in the beam support on the other side, the bolt elbow is tightly connected with the embedded bolt sleeve, and the upper surface bar is bound after the installation of the support beam is completed.

[0010] Preferably, a single laminated slab is formed as a whole structure by a shaped steel formwork, steel bars, bolt sleeves, end plates, rubber protection pads and concrete pouring; the steel bars are connected with the bolt sleeves through the welded end plates, and the bolt sleeves are tightly connected with the bolt elbows to form a whole force structure.

[0011] Preferably, in step 1, the thickness of the steel plate is 3-5mm, and the reserved steel bar position of the cut side steel plate needs to be consistent with the design document; when the bottom plate is welded with the side steel plate, the weld needs to be smooth without pores and slag, and if there are defects, they need to be repaired in time to ensure the overall stiffness of the shaped steel formwork.

[0012] Preferably, in step 2, the steel bars need to be straightened, cut, cut and bent, and the truss steel bars need to be welded in advance; the steel bar spacing and embedded part position are marked on the bottom plate of the shaped steel formwork, the steel bars and truss steel bars are bound and fixed according to the marks and protection layer cushion blocks are arranged to ensure that the steel bar protection layer thickness meets the design requirements.

[0013] Preferably, in step 3, the poured concrete must meet the design strength requirements, and must be horizontally vibrated to be dense and uniform in thickness during pouring; after the concrete reaches the initial setting strength, it must be roughened to form a rough surface; after the steam curing reaches the age, the formwork must be removed, the surface of the composite plate must be cleaned, the position and size of the embedded holes must be checked, and the connection accuracy of the bolt elbow and the bolt sleeve must be ensured.

[0014] The present invention can achieve the following beneficial effects: By maintaining the design at one end of the composite slab and continuing to anchor straight rebar, an end plate was welded to the end of the rebar at the other end. This end plate was then connected to one end of the bolt sleeve, allowing the other end of the bolt sleeve to protrude from the composite slab cross-section. Finally, a matching bolt elbow was designed and installed through the composite slab at the other end, facilitating on-site installation. This solved the problem of rebar on one side of the composite slab being able to anchor properly into the support beam on one side, but difficult to do so on the other side, requiring repeated adjustments and making construction difficult. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] The present invention will be further described below with reference to the accompanying drawings and examples: Figure 1 It is an overall schematic diagram of a single finished composite board; Figure 2 This is a schematic diagram of the internal reinforcement arrangement and embedded parts of a single composite slab; Figure 3 This is a schematic diagram of the internal reinforcement arrangement and overall installation of embedded parts of a single composite slab; Figure 4 This is a schematic diagram of the overall installation of embedded parts for a single finished composite panel sample; Figure 5 This is a schematic diagram of the overall installation of the finished composite panel; Figure 6 This is a schematic diagram of the installation at the support beam of the finished composite slab.

[0016] In the figure: 1-composite plate, 2-bolt sleeve, 3-end plate, 4-bolt elbow, 5-rebar, 6-beam support, 7-rubber protective pad, standard steel formwork A, frame support B. DETAILED DESCRIPTION

[0017] The preferred solution is Figures 1 to 6 As shown, a method for constructing and installing a composite slab is as follows: Step 1: Detailed design of prefabricated composite slab components and design and processing of standard steel formwork; In step 1, the steel plate is cut into the bottom plate and the side steel plates according to the requirements of the design drawing document, and the side steel plates are cut to reserve the position of the steel bars; the bottom plate and the side steel plates are welded into a whole to complete the construction of the single composite plate 1 fixed steel formwork; The steel plate is made of Q235 material, with a thickness of 3-5 mm to ensure the overall rigidity of the formwork; the cutting accuracy is controlled within ±1 mm, and the steel plate surface rust and impurities need to be cleaned before welding; the weld height is not less than 0.7 times the thickness of the steel plate; and 24h natural aging treatment is carried out after welding to reduce welding stress.

[0018] Step 2: Installation of internal reinforcement and embedded parts of laminated slab prefabricated components; In step 2, the reinforcement 5 is cut and processed into semi-finished products according to the design drawing file requirements, including longitudinal and transverse reinforcement of the bottom plate and truss reinforcement; the bottom reinforcement 5 is welded to the end plate 3, the end plate 3 is welded to the bolt sleeve 2, the bolt sleeve 2 is embedded in the rubber protection pad 7, and the rubber protection pad 7 is blocked and solid; mark the spacing of the reinforcement and the position of the embedded parts on the bottom steel plate; bind and fix the reinforcement 5 according to the positioning spacing; embed and fix the embedded parts according to the positioning position; check and accept to ensure that the construction is correct and accurate; The binding overlap length of the reinforcement 5 is not less than 35d (d is the diameter of the reinforcement), the truss reinforcement and the bottom plate reinforcement are fixed by binding and spot welding, and the welding point spacing is ≤500mm; the embedded part is fixed with the formwork by φ8 expansion bolts, and the fixing force is ≥5kN; the reinforcement protection layer pad uses C40 concrete prefabricated block, the spacing is ≤1m, and the reinforcement protection layer thickness meets the design requirements (generally 20mm).

[0019] Step 3: In-plant production and trial assembly of laminated slab prefabricated components; In step 3, the design concrete is poured into the laminated slab 1 formwork, horizontally vibrated, and roughened in time after initial setting to make a rough surface, and in-plant steam curing is carried out; after reaching the curing age, the steel formwork is removed, and the surface of the laminated slab is cleaned; the rubber protection pad 7 embedded in the bolt sleeve 2 is taken out, and the embedded hole is cleaned; the bolt elbow 4 is tightly connected with the bolt sleeve 2, and the installation effect is detected to be feasible; repeat step 3 to produce all laminated slabs according to the design file requirements; The poured concrete strength grade is C30-C40, the slump control is within 180±20mm, the vibration uses φ50 vibrating rod, and the vibration spacing is ≤300mm; the steam curing is divided into four stages of static stop (2h, temperature ≥5℃), temperature rise (2h, temperature rise rate ≤15℃ / h), constant temperature (6-8h, temperature 60-80℃), and temperature drop (2h, temperature drop rate ≤10℃ / h); when the formwork is removed, the concrete strength is ≥75% of the design strength, the embedded hole needs to be blown by compressed air after cleaning to ensure that the inner wall is free of impurities, smooth and without burrs, and the bolt connection detection uses torque wrench, and the initial pre-tightening torque is 30-50N·m. Step 4: On-site installation of laminated slab prefabricated components; In step 4, all the laminated boards 1 are transported to the construction site after passing the factory acceptance test; the laminated boards 1 are bound firmly with lifting belts, and are lifted to the designed position by using hoisting equipment; one end of the straight steel bars 5 of the laminated boards 1 is anchored into the beam support 6; the other end of the laminated boards 1 is placed on the other end beam support 6; the single laminated board 1 is adjusted to the correct plane and elevation position; step 4 is repeated to place all the laminated boards 1 at the position required by the design document; When transported, the laminated boards 1 are stacked in 6 layers or less, and 100*100mm square wood pads are arranged between the layers, and the pad positions correspond to the lifting points; the lifting is performed by using special lifting belts, the lifting points are arranged at the nodes of the upper chord of the truss reinforcement, and the lifting angle is greater than or equal to 60 degrees; the plane position adjustment is performed by using a crowbar combined with a level, and the error is controlled within ±5mm, the elevation adjustment is performed by using 1-3mm thick stainless steel shims, and the height difference between adjacent boards is ensured to be less than or equal to 3mm. Step 5: installation of laminated board prefabricated component support beam and binding of upper reinforcement.

[0020] In step 5, the rubber protection pads 7 at the other end of all the laminated boards 1 are pulled out, and the embedded holes are cleaned; the finished bolt elbow 4 is inserted into the other side beam support 6 and is tightly connected with the embedded bolt sleeve 2.

[0021] After the rubber protection pads 7 are pulled out, the thread integrity in the bolt sleeve 2 needs to be checked, and if damaged, it needs to be repaired by using a tap; the embedded hole cleaning is performed by using a high-pressure air gun to blow, so that there is no dust and water accumulation; when the bolt elbow 4 is connected with the bolt sleeve 2, a torque wrench is used to tighten twice, the first pre-tightening is to 50% of the design torque, and the second tightening is to the design torque (40-60N·m), and after connection, the exposed thread is 2-3 teeth, and when accepted, the torque recheck method is used to ensure that the tightening is reliable.

[0022] The above embodiments are only preferred technical solutions of the present application, and should not be regarded as limitations of the present application, and the protection scope of the present application should be the technical solutions recited in the claims, including equivalent replacement solutions of the technical features recited in the claims. That is, within this range, equivalent replacement improvements are also within the protection scope of the present application.

Claims

1. A method for construction and installation of a composite panel, characterized in that The following steps are involved: Step 1: Conduct in-depth design of prefabricated composite slab components, and design and process standardized steel formwork; Step 2: Install the steel bars and embedded parts inside the prefabricated components of the composite slab; Step 3: Conduct trial assembly of prefabricated components of composite slabs in the factory; Step 4: On-site installation of prefabricated components of composite slabs; Step 5: Install the support beams of the prefabricated components of the composite slab and tie the upper reinforcement.

2. A composite slab construction and installation method according to claim 1, characterized in that: In step 1, the original design document is further designed, steel plates are purchased and cut, cut and welded according to the dimensions required by the further design document, and the bottom plate and side steel plates are welded to form a standard steel formwork. The side steel plates need to reserve positions for steel bars, and the positions of embedded parts must be accurate.

3. The method for constructing and installing a composite slab according to claim 1, wherein: In step 2, the steel bars and truss steel bars are cut, manufactured and tied in accordance with the requirements of the design documents to ensure that the steel bar model, specification and spacing meet the design requirements; one end of the steel bar is kept in the form of a straight steel bar and anchored out, and the other end is welded to the end plate, the end plate is connected to one end of the bolt sleeve and the other end of the bolt sleeve is exposed from the composite plate section, and the exposed end of the bolt sleeve is blocked with a rubber protective pad; other embedded parts in the plate are accurately positioned according to the design documents; the steel bars include bottom bars and surface bars.

4. The method for constructing and installing a composite slab according to claim 1, characterized in that: In step 3, after checking that the steel bars and embedded parts in the standard steel formwork are correct, concrete is poured. At the same time, the finished composite slabs are steam-cured in the factory and the formwork is removed after reaching the design age. The rubber protective pads are pulled out and the embedded holes are cleaned. The bolt elbows are tested to connect with the embedded holes to verify the feasibility of the installation. The above operations are repeated to mass-produce composite slab prefabricated components in the factory.

5. The method for constructing and installing a composite slab according to claim 1, characterized in that: In step 4, all prefabricated components of the composite slab are transported to the installation site after passing factory inspection. According to the design number, the composite slab is lifted to the designed position using lifting equipment. The straight steel bars at one end of the composite slab are first anchored into the corresponding beam support, and the other end is simultaneously placed in the beam support on the other side. The plane position and elevation are adjusted. Repeat this step until all composite slabs are hoisted.

6. The method for constructing and installing a composite slab according to claim 1, characterized in that: In step 5, pull out the rubber protective pad at the other end of the composite plate and clean the embedded hole, install the bolt elbow in the other side beam support, and fasten the bolt elbow to the embedded bolt sleeve. After completing the installation of the support beam, tie the upper surface reinforcement.

7. The method for constructing and installing a composite slab according to claim 1, characterized in that: A single composite slab is formed into an integral structure by a standard steel formwork, steel bars, bolt sleeves, end plates, rubber protective pads and concrete pouring; the steel bars are connected to the bolt sleeves through welded end plates, and the bolt sleeves are fastened to the bolt elbows to form an integral force-bearing structure.

8. The method for constructing and installing a composite slab according to claim 2, characterized in that: In step 1, the thickness of the steel plate is 3-5mm, and the position of the reserved steel bars on the side steel plate after cutting must be consistent with the design documents; when welding the bottom plate and the side steel plates, the weld must be smooth without pores and slag inclusions. If there are defects, they must be repaired in time to ensure the overall rigidity of the standard steel formwork.

9. The method for constructing and installing a composite slab according to claim 3, characterized in that: In step 2, the steel bars need to be straightened, blanked, cut, and bent, and the truss steel bars need to be welded in advance; the steel bar spacing and embedded parts positions are pre-marked on the bottom plate of the standard steel formwork, and the steel bars and truss steel bars are tied and fixed according to the marks and protective layer pads are set to ensure that the thickness of the steel bar protective layer meets the design requirements.

10. The method for constructing and installing a composite slab according to claim 4, characterized in that: In step 3, the poured concrete must meet the design strength requirements, and must be vibrated horizontally to ensure density and uniform thickness during pouring. After the concrete reaches the initial setting strength, it must be roughened to form a rough surface. After the steam curing period reaches the end, the formwork must be removed, the surface of the composite slab must be cleaned, and the position and size of the embedded holes must be checked to ensure the connection accuracy between the bolt elbow and the bolt sleeve.

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