Construction method of pre-tensioning prestressing prefabricated integral pouring structure system
By applying prestress to precast double-T slabs and precast beams in the factory, and by using technologies such as right-angle rods and limiting components, the problems of complex support systems and high difficulty in controlling the quality of node connections in pre-tensioned fully precast assembly structures have been solved, achieving an efficient and stable construction process and reducing costs.
Patent Information
- Application Number
- CN202511672097.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-11-14
- Publication Date
- 2026-01-30
AI Technical Summary
The support system in prefabricated assembly structures is complex, the quality control of node connections is difficult and the cost is high, which affects construction efficiency and cost control.
The construction method of prestressed precast monolithic structure system adopts the pre-tensioning method. By applying prestress to precast double T slabs and precast beams in the factory, a stable force transmission path is formed. During the construction stage, technologies such as right-angle rods, limiting components and hoisting water storage containers are used to improve hoisting efficiency and connection stability.
It improves the load-bearing capacity of precast double-T slabs, reduces the construction of supporting structures during the construction phase, simplifies node connections, reduces construction costs, and improves construction efficiency and overall structural stability.
Smart Images
Figure CN121429192A_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of building construction, and in particular to the construction method of prestressed precast monolithic structural systems using the prestressed prestressing method. Background Technology
[0002] In the construction of modern industrial plants, the efficiency and cost control of the main structure construction have a significant impact on the overall benefits of the project. Traditional construction methods for the main structure, such as cast-in-place construction, suffer from drawbacks including large amounts of formwork and long construction periods.
[0003] To address the shortcomings in the construction of the main structure of the factory building, modern main structure construction employs pre-tensioned precast component assembly, which can significantly shorten the construction period. However, while pre-tensioned fully precast assembly structures can shorten the construction period, the pre-tensioned support system is complex, the quality control of pre-tensioned node connections is difficult, and the pre-tensioning cost is relatively high. Summary of the Invention
[0004] To address the challenges of complex support systems and high difficulty in controlling the quality of node connections during the construction of pre-tensioned precast assembled structures, this application provides a construction method for pre-tensioned prestressed monolithic cast-in-place structures.
[0005] The construction method for the prestressed precast monolithic structure system provided in this application adopts the following technical solution: The construction method of the prestressed precast monolithic structure system using the pre-tensioning method includes the following steps: construction preparation; fabrication of precast double-T slabs and precast beams, with prestressing applied using the pre-tensioning method. The precast double-T slabs have a panel and two ribs located on one side of the panel, with anchor bars reserved on the side of the panel away from the two ribs; construction of cast-in-place frame columns; hoisting of precast beams; after each precast beam is hoisted, the reserved steel bars at the beam ends are tied to the steel bars at the top of the column; hoisting of precast double-T slabs. Before lifting the precast double-T slab, mark the slab position control line on the top surface of the precast beam, and control the gap between adjacent overlapping double ribs to 20~30mm; the lifting sequence of the precast double-T slab is to lift symmetrically from the middle of the span to both ends; slab surface reinforcement binding and concrete pouring; binding the slab surface main reinforcement and distribution reinforcement according to the design drawings, and binding the reinforcement to the precast double-T slab reserved anchor reinforcement; concrete pouring sequence proceeds from the middle of the span to both ends; concrete curing; after the concrete is poured, cover with geotextile and water for curing.
[0006] By adopting the above technical solutions, prestressing is applied to the components during the factory prefabrication stage of precast double-T slabs and precast beams to improve their load-bearing capacity. During the construction stage, the wide panels of the precast double-T slabs also serve as lateral load-bearing structures. Precast double-T slabs have a higher load-bearing capacity than conventional precast composite slabs. The precast double-T slabs and precast beams form a stable force transmission path, reducing the need for supporting structures during construction. In the connection process, the pre-embedded anchor bars at the top of the columns are connected to the reserved steel bars in the precast beams. The steel bars of the precast double-T slabs are tied to the steel bars of the precast beams before the composite layer of the slab is poured, ultimately forming a rigid spatial frame of "column-beam-slab," balancing the efficiency of prefabrication with the integrity of cast-in-place construction.
[0007] Optionally, when hoisting precast double-T slabs, if there are precast double-T slabs on the precast beam, multiple right-angle rods are placed on the previously hoisted precast double-T slab. Each right-angle rod has two side rods. One side rod of the right-angle rod abuts against the upward-facing surface of the precast double-T slab, and the other side rod hangs down and abuts against the side of the precast double-T slab. When hoisting the next precast double-T slab, the hanging side rod of the right-angle rod is used as a limiting structure between the subsequently hoisted precast double-T slab and the previous precast double-T slab.
[0008] By adopting the above technical solution, using the side bar of the right-angle rod as the limiting structure between the precast double-T slab and the previous precast double-T slab during hoisting, a uniform gap can be maintained between the two precast double-T slabs hoisted sequentially, eliminating the need for manual adjustment of the gap width between the two precast double-T slabs, which is more convenient. The installation and placement process of the right-angle rod is relatively simple, which helps to improve the work efficiency of hoisting precast double-T slabs.
[0009] Optionally, when hoisting a precast double-T slab on a precast beam, a sling is tied to the precast double-T slab during hoisting. After the sling passes around the precast double-T slab on the precast beam, a hoisting water storage container is tied to it. During the descent of the precast double-T slab during hoisting, the hoisting water storage container horizontally pulls the precast double-T slab through the sling, so that the precast double-T slab during hoisting is pressed against the drooping side bar of the right-angle bar.
[0010] By adopting the above technical solution, the weight of the hoisting water storage container forces the binding ropes to press against the precast double-T slabs on the precast beam, so that the binding ropes generate a horizontal component force on the precast double-T slabs during hoisting, thereby causing the precast double-T slabs to press against the drooping side bar of the right-angle rod during the descent; the precast double-T slabs during hoisting do not require manual traction, which is safer and more efficient.
[0011] Optionally, during the hoisting of precast double-T slabs, a water recovery container is placed at the construction site. The water recovery container is equipped with a water pump inside, which is used to pump clean water into the hoisting water recovery container. A drain pipe is provided at the bottom of the hoisting water recovery container, and the drain pipe is equipped with a switch valve.
[0012] By adopting the above technical solution, during the hoisting of precast double-T slabs, a water pump is used to fill the hoisting water storage container, increasing its weight and facilitating the application of traction force to the precast double-T slabs during hoisting. Once the precast double-T slab is in place, the valve is opened to drain the water from the hoisting water storage container into a recovery water storage container, emptying the hoisting water storage container. This allows the slings to be disassembled and connected to the subsequent hoisting of the precast double-T slabs. The water required for increasing the weight of the hoisting water storage container can flow back and forth between the hoisting and recovery water storage containers, eliminating the need for a continuous water supply to the construction site and continuous drainage, which is quite convenient.
[0013] Optionally, plastic buffer pads are installed at the reversing points of the precast double-T slabs on the slings. The plastic buffer pads are used to separate the slings from the corners of the precast double-T slabs.
[0014] By adopting the above technical solution, the plastic buffer pad can separate the slings and the precast double-T plates on the precast beams, so as to protect the edges and corners of the slings and the precast double-T plates on the precast beams.
[0015] Optionally, during the fabrication of precast double-T slabs, several limiting components are welded onto the embedded reinforcing bars of the precast double-T slabs. These limiting components are spaced apart along the length of the precast double-T slab. Each limiting component includes a connecting rod, two internally threaded sleeves, and two threaded rods. The two internally threaded sleeves are connected to both ends of the connecting rod, and are used for threaded connection with the two threaded rods. Each threaded rod has two longitudinal sections, which are perpendicular to each other and have a clearance between them and the axis of the threaded rod. Insertion holes for the threaded rods are pre-drilled on both sides of the mold for the precast double-T slabs. During the casting of the precast double-T slab, the connecting rod of the limiting components is pre-fixed inside the mold of the precast double-T slab, and then the two threaded rods are inserted through the insertion holes on both sides of the mold and spirally inserted into the internally threaded sleeves. Inside the threaded sleeve, sealant is used to seal the gap between the screw and the internal threaded sleeve. After the precast double-T slab is cast, the two screws are removed, and the precast double-T slab is demolded. When hoisting the precast double-T slab, the internal threaded sleeve of the limiting component of the precast double-T slab is left empty. A screw is pre-installed in the internal threaded sleeve of the limiting component of the previously hoisted precast double-T slab, so that the length of the screw extension is less than the preset gap width between two adjacent precast double-T slabs. After the subsequent precast double-T slab is installed and the two ends of the precast double-T slabs are aligned, the screw is rotated using tools such as wrenches and pipe wrenches, so that the screw is gradually rotated and inserted into the subsequent precast double-T slab, so that the two adjacent precast double-T slabs are connected.
[0016] By adopting the above technical solution, when hoisting precast double-T slabs, the use of screws to connect two adjacent precast double-T slabs hoisted sequentially improves the stability of the connection between the precast double-T slabs. The screw has two mutually perpendicular longitudinal sections, allowing tools such as wrenches and pipe wrenches to rotate it, while also ensuring a larger distribution range of threads on the screw, thus guaranteeing the reliability of the threaded connection.
[0017] Optionally, when the screw passes through the insertion hole and is threaded into the internal threaded sleeve, a sealing material is used to seal the fit clearance between the screw and the insertion hole.
[0018] By adopting the above technical solution, the gap between the screw and the insertion hole can be sealed with sealing material, which can reduce the overflow of concrete from the insertion hole in the mold of the precast double-T plate.
[0019] Optionally, the end of the connecting rod has a square head structure, and the end of the internal threaded sleeve has a square hole. The square head structure of the connecting rod is clearance-fitted with the square hole, and the clearance between the connecting rod and the internal threaded sleeve is sealed with sealant.
[0020] By adopting the above technical solution, the square head structure at the end of the connecting rod and the square hole of the internal threaded sleeve are fitted with a clearance, so that the internal threaded sleeve and the square head structure form a non-rotation fit. When the screw spirals into the internal threaded sleeve on the prefabricated double-T plate that is hoisted later, the internal threaded sleeve on the prefabricated double-T plate that is hoisted later can rotate or move back and forth slightly to compensate for the misalignment angle when the screw and the internal threaded sleeve cannot be perfectly aligned.
[0021] Optionally, after the spacing between the precast double-T panels is adjusted, a plastic round rod is placed in the gap between adjacent precast double-T panels. The diameter of the plastic round rod is larger than the width of the gap between adjacent precast double-T panels.
[0022] By adopting the above technical solution, the plastic round bar can seal the gap between adjacent precast double-T panels, the plastic round bar can act as a template, and the spacing between adjacent precast double-T panels can be made more stable.
[0023] In summary, this application includes at least one of the following beneficial technical effects: During the construction phase, precast double-T slabs have a higher load-bearing capacity than conventional precast composite slabs. The precast double-T slabs and precast beams form a stable force transmission path, reducing the need for supporting structures during construction. In the connection stage, pre-embedded anchor bars at the column tops are connected to the pre-reserved reinforcing bars in the precast beams. The reinforcing bars of the precast double-T slabs are tied to the reinforcing bars of the precast beams before the composite layer of the slab is poured, ultimately forming a rigid "column-beam-slab" spatial frame that balances the efficiency of precasting with the integrity of cast-in-place construction.
[0024] Using the side members of a right-angled rod as a limiting structure between the precast double-T slabs during hoisting ensures a uniform gap between the two hoisted slabs, eliminating the need for manual adjustment of the gap width and making the process more convenient. The installation and placement of the right-angled rod are also simple, improving the efficiency of hoisting precast double-T slabs. Attached Figure Description
[0025] Figure 1 This is a flowchart of the construction method of the prestressed precast monolithic structure system of Example 1.
[0026] Figure 2 This is a schematic diagram of the prefabricated double-T plate being hoisted and positioned in Example 1.
[0027] Figure 3 This is a schematic diagram showing the hoisting process of the prefabricated double-T plate from another perspective in Example 1.
[0028] Figure 4 This is a schematic diagram of the hoisting process of the prefabricated double-T plate in Example 2.
[0029] Figure 5 This is a schematic diagram of the limiting component in Embodiment 3.
[0030] Figure 6 This is a schematic diagram used in Example 3 to illustrate the engagement state of the wrench and the screw.
[0031] Explanation of reference numerals in the attached figures: 1. Precast double-T slab; 11. Panel; 12. Rib; 13. Limiting assembly; 131. Connecting rod; 132. Internal threaded sleeve; 133. Screw; 1331. Longitudinal section; 14. Plastic round bar; 2. Precast beam; 3. Cast-in-place frame column; 4. Right angle bar; 41. Edge bar; 5. Lifting sling; 6. Lifting water storage container; 61. Drainage pipe; 62. Switch valve; 7. Plastic buffer pad; 8. Recycling water storage container; 9. Water pump. Detailed Implementation Example 1
[0032] The following is in conjunction with the appendix Figure 1-6 This application will be described in further detail.
[0033] This application discloses a construction method for a prestressed precast monolithic structure system using the pre-tensioned method. (Refer to...) Figure 1 , Figure 2 and Figure 3 The construction method of the prestressed precast monolithic structure system includes the following steps: Step 1, Construction preparation; Modify the mold of precast double T slab 1 to make precast double T slab 1 and precast beam 2. The precast double T slab 1 and precast beam 2 are prestressed by pre-tensioning. The precast beam 2 is an inverted T-shaped frame beam. Rubber pads are embedded in the precast beam 2 for the precast double T slab 1 to overlap. The precast double T slab 1 has a panel 11 and two ribs 12 located on one side of the panel 11. Anchor bars are reserved on the side of the panel 11 away from the two ribs 12. Step 2, construction of cast-in-place frame column 3; first, tie the reinforcing bars for cast-in-place frame column 3, then set up the formwork, and then pour the concrete. After the concrete has solidified, remove the formwork for curing. Step 3, hoisting of precast beam 2; precast beam 2 is hoisted at two points (the hoisting point is 1 / 3 of the span away from the beam end). When the precast beam 2 is hoisted to 500mm above the top of the column, the beam position is slowly adjusted so that the reserved steel bars at the beam end are aligned with the steel bars at the top of the column, and then the beam is slowly lowered; after each precast beam 2 is hoisted, the elevation and axis position of the beam are checked. After the adjustment is qualified, the reserved steel bars at the beam end are tied to the steel bars at the top of the column. Step 4, hoisting of precast double T slab 1; before hoisting the precast double T slab 1, the slab position control line is marked on the top surface of the precast beam 2. When the precast double T slab 1 is hoisted to 300mm above the precast beam 2, the position of the precast double T slab 1 is adjusted and slowly placed on the rubber pad pre-embedded on the precast beam 2. The gap between adjacent overlapping double ribs is controlled at 20~30mm. The two ends of the precast double-T slab 1 are respectively connected to the two precast beams 2. The precast double-T slab 1 is hoisted symmetrically from the middle of the span to both ends to avoid excessive stress on one side of the beam and deformation. Step 5, precast double T slab 1 node treatment; after the precast double T slab 1 is hoisted, plastic round rods 14 are placed in the gap between adjacent precast double T slabs 1. The plastic round rods 14 are round PE rods with a diameter slightly larger than the gap width between adjacent precast double T slabs 1. Then, fine stone concrete is poured, and the concrete pouring height is flush with the top surface of the precast double T slab 1. Step 6: Binding of reinforcing bars and pouring of concrete on the slab surface; According to the design drawings, tie the slab surface reinforcing bars and distribution bars, and tie the reinforcing bars to the precast double-T slab 1 reserved anchor bars, with the tying point spacing ≤200mm; After the reinforcing bars are tied, set up the stirrups, and place 50mm×50mm square timber at the bottom of the stirrups.
[0034] When pouring concrete, a plate vibrator is used for compaction. The concrete pouring sequence is from the middle of the span to both ends to avoid the displacement of components caused by concentrated pouring at a single point. During the pouring process, the sealing of joints is checked and any leakage is repaired in time. Step 7, concrete curing; cover the concrete with geotextile within 4 hours after pouring and water it for curing.
[0035] The implementation principle of the prestressed precast monolithic structure system construction method in this application embodiment is as follows: During the factory prefabrication stage, prestress is applied to the precast double-T slab 1 and precast beam 2 to improve their load-bearing capacity. This prestress can counteract the bending moment of the load during service, reducing the required cross-sectional dimensions of the components, decreasing concrete usage, delaying crack formation, and improving structural durability to meet the long-term heavy load and vibration conditions of the factory building. The standardized factory production of precast components helps ensure quality. The environmental protection and energy-saving effects are outstanding.
[0036] During the construction phase, the hoisting of the inverted T-shaped frame beam and precast double T-slab 1 relies on the inherent rigidity of the components and precise positioning technology, eliminating the need for a temporary support system. The wide panel 11 of the precast double T-slab 1 also serves as a lateral load-bearing structure. The precast double T-slab 1 has a higher load-bearing capacity than conventional precast composite slabs. The inverted T-shaped frame beam enhances its bending and shear resistance through cross-sectional design. The precast double T-slab 1 and the precast beam 2 form a stable force transmission path, reducing the need for the erection of support structures during the cast-in-place construction phase. In the connection process, the pre-embedded anchor bars at the top of the column are connected to the reserved steel bars of the precast beam 2. The precast double-T slab 1 is placed on the flange of the beam. The steel bars of the precast double-T slab 1 are tied to the steel bars of the precast beam 2 and then the slab surface is poured to form a composite layer, which ultimately forms a spatial frame with rigid connection of "column-beam-slab", taking into account both the efficiency of prefabrication and the integrity of cast-in-place. Example 2
[0037] Reference Figure 4 The difference between this embodiment and embodiment 1 is that: in this embodiment, when hoisting the precast double-T slab 1 in step 3, if the precast double-T slab 1 exists on the precast beam 2, multiple right-angle rods 4 are placed on the previously hoisted precast double-T slab 1. The right-angle rod 4 has two side rods 41. One side rod 41 of the right-angle rod 4 abuts against the upward-facing surface of the precast double-T slab 1, and the other side rod 41 hangs down and abuts against the side of the precast double-T slab 1. When hoisting the next precast double-T slab 1, the hanging side rod 41 of the right-angle rod 4 is used as a limiting structure between the subsequently hoisted precast double-T slab 1 and the previous precast double-T slab 1.
[0038] A sling 5 is tied to the precast double-T slab 1 during hoisting. After the sling 5 passes around the precast double-T slab 1 on the precast beam 2, a hoisting water storage container 6 is tied to it. The bottom of the hoisting water storage container 6 is equipped with a drain pipe 61, and the drain pipe 61 is equipped with a switch valve 62. A plastic buffer pad 7 is set at the reversing point of the precast double-T slab 1. The plastic buffer pad 7 has an L-shaped structure to fasten the corners of the precast double-T slab 1. The plastic buffer pad 7 can protect the sling 5 and the corners of the precast double-T slab 1. At the same time, a recovery water storage container 8 is placed at the construction site. A water pump 9 is installed inside the recovery water storage container 8. The water pump 9 is a submersible pump. The outlet end of the submersible pump 9 is connected to a hose. The water pump 9 is used to pump clean water into the hoisting water storage container 6. During the descent of the precast double-T slab 1 during hoisting, the hoisting water storage container 6 pulls the precast double-T slab 1 horizontally through the sling 5, so that the precast double-T slab 1 during hoisting is pressed against the drooping side bar 41 of the right angle bar 4.
[0039] The implementation principle of this embodiment is as follows: when hoisting the precast double-T slab 1, water is injected into the hoisting water storage container 6 by the water pump 9. After the hoisting water storage container 6 is injected with water, it becomes heavier, so as to apply traction force to the precast double-T slab 1 during hoisting.
[0040] The weight of the hoisting water storage container 6 forces the binding ropes to press against the precast double-T slab 1 on the precast beam 2, causing the binding ropes to generate a horizontal component force on the precast double-T slab 1 during hoisting. This causes the precast double-T slab 1 to press against the drooping side bar 41 of the right-angle rod 4 during its descent. The side bar 41 of the right-angle rod 4 serves as a limiting structure between the precast double-T slab 1 during hoisting and the previous precast double-T slab 1, ensuring a uniform gap between the two precast double-T slabs 1 hoisted successively. This eliminates the need for manual adjustment of the gap width between the two precast double-T slabs 1, making it more convenient.
[0041] After the precast double-T slab 1 is hoisted into place, the switch valve 62 is opened to drain the water in the hoisting water storage container 6 into the recovery water storage container 8 through the drain pipe 61, thus emptying the hoisting water storage container 6. This allows the lifting slings 5 to be disassembled and connected to the subsequent hoisted precast double-T slab 1. The water required for the weight increase of the hoisting water storage container 6 can flow back and forth between the hoisting water storage container 6 and the recovery water storage container 8, eliminating the need for a continuous water supply to the construction site and continuous drainage, which is quite convenient. Example 3
[0042] Reference Figure 5 and Figure 6The difference between this embodiment and embodiment 1 is that, in step 1, when manufacturing the precast double-T slab 1, several limiting components 13 are welded to the pre-embedded steel bars of the precast double-T slab 1. The limiting components 13 are distributed at intervals along the length direction of the precast double-T slab 1. The limiting components 13 include a connecting rod 131, two internal threaded sleeves 132 and two screws 133. The two internal threaded sleeves 132 are respectively connected to both ends of the connecting rod 131. The end of the connecting rod 131 is a square head structure. The connecting rod 131 can be set as a square rod or a round rod with square heads at both ends. The end of the internal threaded sleeve 132 is provided with a square hole. The square head structure of the connecting rod 131 is clearance-fitted with the square hole. The clearance between the connecting rod 131 and the internal threaded sleeve 132 is sealed with sealant.
[0043] Two screws 133 are used to thread into two internally threaded sleeves 132. Each screw 133 has two longitudinal sections 1331, which are perpendicular to each other and have a clearance between them and the axis of the screw 133. The mold for the precast double-T plate 1 has pre-drilled insertion holes on both sides for the screws 133 to pass through. When casting the precast double-T plate 1, the connecting rod 131 of the limiting assembly 13 is pre-fixed inside the mold of the precast double-T plate 1. Then, the two screws 133 are inserted through the insertion holes on both sides of the mold and spirally inserted into the internally threaded sleeves 132. The clearance between the screws 133 and the internally threaded sleeves 132 is sealed with sealing material, and the clearance between the screws 133 and the insertion holes is also sealed with sealing material. After the precast double-T plate 1 is cast and formed, the two screws 133 are removed, and the precast double-T plate 1 is demolded.
[0044] When hoisting the precast double-T slab 1, the internal threaded sleeve 132 of the limiting component 13 of the precast double-T slab 1 remains empty. A screw 133 is pre-installed in the internal threaded sleeve 132 of the limiting component 13 of the previously hoisted precast double-T slab 1, so that the length of the screw 133 extending out is less than the preset gap width between two adjacent precast double-T slabs 1. After the subsequent precast double-T slab 1 is installed and the two ends of the two precast double-T slabs 1 are aligned, the screw 133 is rotated using tools such as adjustable wrenches, open-end wrenches, and pipe wrenches. The open-end wrench can be customized according to the cross-sectional dimensions of the screw 133, so that the screw 133 is gradually rotated and inserted into the subsequent hoisted precast double-T slab 1, so that a connection is formed between two adjacent precast double-T slabs 1, which helps to improve the stability of the connection between the precast double-T slabs 1.
[0045] The screw 133 has two mutually perpendicular longitudinal sections 1331, which allow tools such as wrenches and pipe wrenches to rotate the screw 133, while also ensuring a large distribution range of the threads on the screw 133 to guarantee the reliability of the threaded connection. To make it easier for the screw 133 to engage with the internal threaded sleeve 132, chamfers should be provided at the end of the screw 133 and the outer port of the internal threaded sleeve 132.
[0046] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.
Claims
1. A construction method of a precast monolithic structure system by the pretensioning method, characterized in that, It comprises the following steps: construction preparation; manufacturing prefabricated double T plate (1) and prefabricated beam (2), the prefabrication of prefabricated double T plate (1) and prefabricated beam (2) adopts pre-tensioning method to apply prestress, prefabricated double T plate (1) has face plate (11) and two rib plates (12) on one side of face plate (11), the side of face plate (11) away from two rib plates (12) is provided with anchoring rib; Cast-in-situ frame column (3) construction; Prefabricated beam (2) hoisting; after the hoisting of each prefabricated beam (2) is completed, the beam end reserved steel bar is bound and connected with the column top steel bar; Prefabricated double T plate (1) hoisting; before the prefabricated double T plate (1) is hoisted, the plate position control line is popped up on the top surface of prefabricated beam (2), and the gap between adjacent superimposed double ribs is controlled to be 20-30 mm; the hoisting sequence of prefabricated double T plate (1) is symmetrically hoisted from the middle span to both ends; Plate surface steel bar binding and concrete pouring; According to the design drawing, the plate surface stress steel bar and distribution rib are bound, and the steel bar is bound and connected with the prefabricated double T plate (1) reserved anchoring rib; the concrete pouring sequence is advanced from the middle span to both ends. Concrete curing; after the concrete pouring is completed, the geotextile is covered, and the water is poured for curing.
2. The construction method of the pre-tensioned prestressed precast monolithic structural system according to claim 1, characterized in that: When the prefabricated double T plate (1) is hoisted, a plurality of right angle bars (4) are placed on the prefabricated beam (2) in the case that the prefabricated double T plate (1) exists on the prefabricated beam (2), the right angle bar (4) has two edge bars (41), one edge bar (41) of the right angle bar (4) abuts against the upward surface of the prefabricated double T plate (1) where it is located, and the other edge bar (41) is downward and abuts against the side of the prefabricated double T plate (1) where it is located; when the latter prefabricated double T plate (1) is hoisted, the downward edge bar (41) of the right angle bar (4) is used as the limiting structure between the hoisted prefabricated double T plate (1) and the former prefabricated double T plate (1).
3. The construction method of the pre-tensioned prestressed precast monolithic structural system according to claim 2, characterized in that: When the prefabricated double T plate (1) is hoisted in the case that the prefabricated double T plate (1) exists on the prefabricated beam (2), the hoisting cable (5) is bound on the hoisted prefabricated double T plate (1), and the hoisting water storage container (6) is bound after the hoisting cable (5) passes through the prefabricated double T plate (1) on the prefabricated beam (2); in the process of the hoisted prefabricated double T plate (1) descending, the hoisting water storage container (6) horizontally pulls the prefabricated double T plate (1) through the hoisting cable (5), so that the hoisted prefabricated double T plate (1) abuts against the downward edge bar (41) of the right angle bar (4).
4. The construction method of the pre-tensioned prestress prefabricated monolithic structure system according to claim 3, characterized in that: In the process of hoisting the prefabricated double T plate (1), a recovery water storage container (8) is placed in the construction site, a water pump (9) is arranged on the inner side of the recovery water storage container (8), and the water pump (9) is used for pumping clean water into the hoisting water storage container (6); a drain pipe (61) is arranged at the bottom of the hoisting water storage container (6), and the drain pipe (61) is provided with an on-off valve (62).
5. The construction method of the pre-tensioned prestressed precast monolithic structural system according to claim 3, characterized in that: The plastic buffer pad (7) is arranged at the reversing position of the hoisting cable (5) of the prefabricated double T plate (1), and the plastic buffer pad (7) is used for separating the hoisting cable (5) and the edge corner of the prefabricated double T plate (1).
6. The construction method of the pre-tensioned prestress prefabricated monolithic structure system according to claim 1, characterized in that: In the prefabricated double T plate (1) is made, in the prefabricated double T plate (1) embedded steel welding is provided with several limiting components (13), limiting components (13) along the length direction of prefabricated double T plate (1) interval distribution;Limiting components (13) include connecting rod (131), two internal thread sleeve (132) and two screw rods (133), two internal thread sleeve (132) are connected with the two ends of connecting rod (131) respectively, two internal thread sleeve (132) are used for screwing with two screw rods (133) respectively, screw rod (133) is provided with two longitudinal section (1331), two longitudinal section (1331) perpendicular to each other, and there is a spacing margin between the axis of screw rod (133), the mold of prefabricated double T plate (1) is provided with two insertion hole for screw rod (133) to pass through in advance;Pouring prefabricated double T plate (1) when, the connecting rod (131) of limiting component (13) is fixed in the mold of prefabricated double T plate (1) in advance, then two screw rods (133) are respectively inserted from the insertion hole of the mold on both sides, and are screwed into the internal thread sleeve (132) again, and then the cooperation gap between screw rod (133) and internal thread sleeve (132) is sealed by sealing material;When prefabricated double T plate (1) is poured and formed, two screw rods (133) are taken out, and prefabricated double T plate (1) is demoulded; When hoisting prefabricated double T plate (1), the internal thread sleeve (132) of the limiting component (13) of prefabricated double T plate (1) remains empty, the internal thread sleeve (132) of the limiting component (13) of the prefabricated double T plate (1) hoisted in place in the previous is preloaded with screw rod (133), so that the length of screw rod (133) extending is less than the preset gap width between adjacent two prefabricated double T plates (1), when the latter prefabricated double T plate (1) is installed in place, and the alignment of the two ends of the two prefabricated double T plates (1) is adjusted, the screw rod (133) is rotated by using wrench, pipe wrench and other tools, so that the screw rod (133) is gradually inserted into the latter hoisted prefabricated double T plate (1), so that the connection between the adjacent two prefabricated double T plates (1) is formed.
7. The construction method of the pre-tensioned prestress prefabricated monolithic structure system according to claim 6, characterized in that: When the screw rod (133) is screwed through the insertion hole and the internal thread sleeve (132), the cooperation gap between the screw rod (133) and the insertion hole is sealed by using sealing material.
8. The construction method of the pre-tensioned prestress prefabricated monolithic structure system according to claim 6, characterized in that: The end of the connecting rod (131) is square head structure, the end of the internal thread sleeve (132) is provided with square hole, the square head structure of the connecting rod (131) is matched with the square hole, and the cooperation gap between the connecting rod (131) and the internal thread sleeve (132) is sealed by using sealing glue. 9.The construction method of the pre-tensioned prestress prefabricated monolithic cast structure system according to claim 1, characterized in that: After the spacing adjustment between prefabricated double T plates (1) is completed, plastic round bar (14) is placed in the gap between adjacent prefabricated double T plates (1), and the diameter of plastic round bar (14) is greater than the gap width between adjacent prefabricated double T plates (1).