A prefabricated column steel precise positioning and efficient sealing device and a construction method thereof

Abstract

The application discloses a kind of assembled precast column reinforcing bar precision positioning and high-efficiency warehouse sealing device and its construction method, belong to assembled building construction technical field, including positioning plate, warehouse sealing bottom plate, warehouse sealing side plate, fixed sheet, embedded bolt and side plate connecting bolt;Positioning plate passes through reserved reinforcing bar by reinforcing bar hole, all reserved reinforcing bars are uniformly constrained and accurately positioned before floor concrete pouring;Warehouse sealing bottom plate and warehouse sealing side plate are welded into L-shaped combination, after floor concrete pouring, it is lowered to floor and fixed, form the closed cavity around the bottom of precast column.The application integrates reinforcing bar positioning and column bottom warehouse sealing, reinforcing bar position deviation can be controlled within ±2mm, without later strong correction;Significantly improve reinforcing bar positioning accuracy, warehouse sealing efficiency and grouting density, eliminate structural safety hazard, device can be reused, construction cost is low, short construction period, applicable to the construction of precast column in various assembled concrete structures.

Description

Technical Field

[0001] This invention belongs to the technical field of prefabricated building construction, specifically relating to a device for precise positioning and efficient sealing of prefabricated column steel bars and its construction method. Background Technology

[0002] Precast concrete structures are widely used in modern construction projects due to their advantages such as fast construction speed, high degree of industrialization, and good environmental benefits. Among them, precast columns, as the main vertical load-bearing components, have their installation quality directly affecting the safety and durability of the overall structure.

[0003] In traditional prefabricated building construction, the positioning and control of the precast column bottom reinforcement bars have long relied on manual operation. Specifically, construction workers mainly adjust the position of the precast reinforcement bars one by one according to the design drawings after the floor slab reinforcement bars are tied, and temporarily fix them by welding them to the beam and slab reinforcement bars. After the structural floor slab concrete is poured and reaches a certain strength, the reinforcement bars that have been misaligned during construction are then manually and forcefully corrected. This extensive operation method has the following prominent problems:

[0004] The process is cumbersome and precision is difficult to guarantee: manual adjustment and welding of each rebar is inefficient, resulting in large deviations in rebar position and failing to meet the high-precision positioning requirements of modern prefabricated structures. Post-correction damage is severe: using brute force to correct misaligned rebars easily damages hardened concrete components and the rebars themselves, affecting structural durability and load-bearing capacity. Labor intensity is high and standardization is low: varying skill levels among construction workers lead to significant fluctuations in rebar positioning quality, and a lack of unified standardized constraints further complicates the process.

[0005] On the other hand, in the sealing process at the bottom of precast columns, the traditional method usually involves manually sealing the area around the bottom of the column with cement mortar after the precast column has been hoisted into place. This approach has the following drawbacks:

[0006] The sealing process is inefficient and labor-intensive: it requires experienced workers to apply grout section by section, resulting in slow construction. The sealing quality is unreliable: the bonding strength between cement mortar and concrete is limited, leading to poor overall integrity and a tendency for cracks or localized detachment. Grout leakage is severe: during subsequent grouting operations, the cement mortar sealing layer is highly susceptible to leakage and runoff under pressure, resulting in incomplete filling of the column base with grout, creating internal voids or weak areas, posing a serious threat to the structural safety.

[0007] In summary, existing technologies lack an integrated device that can simultaneously solve the problems of precise positioning of precast column reinforcement and efficient and reliable sealing of the column base. Therefore, developing a device that can uniformly constrain the position of reinforcement, achieve rapid sealing, and avoid post-correction and grout leakage problems has significant engineering practical value and promising prospects for widespread application. Summary of the Invention

[0008] The technical problem to be solved by the present invention is to provide a device for precise positioning and efficient sealing of precast column reinforcement bars and its construction method to solve the problems mentioned in the background art or achieve better technical effects.

[0009] In order to solve the above-mentioned technical problems, the inventors derived the technical solution of the present invention through practice and summary. The present invention discloses a prefabricated column steel bar precise positioning and efficient sealing device, including: positioning plate, sealing bottom plate, sealing side plate, fixing plate, pre-embedded bolts and matching nuts and side plate connecting bolts.

[0010] The positioning plate has steel bar holes corresponding to the reserved steel bar positions of the precast column;

[0011] The sealing base plate is set between the bottom of the precast column and the floor surface;

[0012] The sealing side plate is fixedly connected to the sealing bottom plate and forms a closed cavity around the bottom of the precast column;

[0013] The fixing piece is detachably connected to the positioning plate and the sealing chamber bottom plate;

[0014] The pre-embedded bolts are used to fix the bottom plate of the sealed chamber to the floor.

[0015] The side plate connecting bolts are used to connect the sealing side plate to the bottom of the precast column.

[0016] Preferably, the sealing base plate and sealing side plate are four independent sets of components, corresponding to the four sides of the precast column, and the sealing base plate and sealing side plate in each set are connected by welding.

[0017] Preferably, the bolt holes on the sealing side plate are oblong or elongated holes to provide installation adjustment margin.

[0018] Preferably, the sealing bottom plate and sealing side plate are made of square steel.

[0019] Preferably, the outer plane dimension of the positioning plate is consistent with the side length of the cross-section of the precast column.

[0020] Preferably, both ends of the fixing plate are detachably connected to the positioning plate and the sealing chamber bottom plate by fixing plate bolts and fixing plate nuts, respectively.

[0021] Preferably, the length of the pre-embedded bolt is greater than the design thickness of the floor slab.

[0022] As a preferred embodiment, the construction method for the precast column reinforcement precise positioning and efficient sealing device described above comprises the following steps:

[0023] S1: Based on the location and diameter of the reserved steel bars in the precast column, make a positioning plate, and based on the side length of the precast column, make a sealing bottom plate and sealing side plate;

[0024] S2: After the precast column is hoisted into place, the positioning plate is passed through the rebar hole and the reserved rebar is fixed in a unified manner;

[0025] S3: Insert the pre-embedded bolts into the floor slab through the bolt holes on the positioning plate;

[0026] S4: The positioning plate and the sealing chamber bottom plate are detachably connected as one unit using a fixing plate;

[0027] S5: Pour the floor slab concrete and cure it to the design strength;

[0028] S6: Loosen the fixing piece and remove the positioning plate;

[0029] S7: Lower the sealing base plate and sealing side plate as a whole to the floor level, and fix the sealing base plate to the floor level using pre-embedded bolts and nuts;

[0030] S8: The sealing side plate is fastened to the pre-reserved bolt holes at the bottom of the precast column by the side plate connecting bolts to form a closed cavity;

[0031] S9: Perform grouting at the bottom of the precast column;

[0032] S10: After the grouting material reaches the design strength, remove the bottom plate and side plate of the sealing chamber, and cut off the pre-embedded bolts exposed on the floor slab.

[0033] Preferably, in step S4, one end of the fixing plate is connected to the positioning plate and the other end is connected to the sealing chamber bottom plate, and the connection and separation of the two are achieved by rotating the fixing plate.

[0034] Preferably, in step S7, after the sealing base plate is fixed to the floor, the installation position is adjusted by the elongated bolt holes on the sealing side plate to overcome the deviation of the floor flatness.

[0035] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0036] (1) The present invention uses a positioning plate to uniformly constrain all reserved steel bars, thereby achieving one-time precise forming of the steel bar position, avoiding deviations caused by manual adjustment and welding, and significantly improving the positioning accuracy.

[0037] (2) The steel bars of the present invention do not shift during the concrete pouring process and do not require strong correction in the later stage, thus fundamentally protecting the formed concrete components and the steel bars themselves from damage.

[0038] (3) The present invention uses a combined steel sealing plate to replace the traditional cement mortar manual sealing, which is quick to install, has good sealing performance, and fits tightly with the column bottom and floor to form a stable and reliable closed cavity.

[0039] (4) The steel sealing structure of the present invention has high strength and good integrity. It does not deform or fall off under the grouting pressure, effectively preventing grout leakage, ensuring that the grouting material is full and dense, and eliminating the hidden danger of internal voids.

[0040] (5) The device disclosed in this invention has a robust structure, is easy to assemble and disassemble, and can be reused multiple times, which greatly reduces construction costs. In addition, this invention simplifies two key processes: steel bar positioning and column bottom sealing, shortens the construction cycle, and saves manpower and resources. Attached Figure Description

[0041] Figure 1 This is a schematic diagram of the overall structure of the precast column and the reserved reinforcing steel bars of the present invention;

[0042] Figure 2 This is a schematic diagram of the horizontal structure of the positioning plate of the present invention;

[0043] Figure 3 This is a schematic diagram of the structure of the present invention, showing the pre-embedded bolts passing through the positioning plate;

[0044] Figure 4 This is a top view of the fixing plate of the present invention;

[0045] Figure 5 This is a side view of the fixing plate of the present invention.

[0046] Figure label:

[0047] 1. Closure floor;

[0048] 2. Positioning plate;

[0049] 3. Reinforcing bar holes;

[0050] 4. Bolt holes;

[0051] 5. Nuts;

[0052] 6. Pre-embedded bolts;

[0053] 7. Fixing plate bolts;

[0054] 8. Fixing plate nut;

[0055] 9. Film negatives;

[0056] 10. Sealing side panels;

[0057] 11. Bolt holes;

[0058] 12. Precast columns;

[0059] 13. Reserve steel reinforcement;

[0060] 14. Fixing plate. Detailed Implementation

[0061] To make the above-mentioned objectives, features and advantages of the present invention more apparent and understandable, the specific embodiments of the present invention will be described in detail below with reference to specific examples.

[0062] Example 1

[0063] like Figures 1-5 As shown, a prefabricated column reinforcement precise positioning and efficient sealing device includes: positioning plate 2, sealing bottom plate 1, sealing side plate 10, fixing plate 14, pre-embedded bolts 6 and matching nuts 5 and connecting bolts to the side plate.

[0064] Functionally, this device has two operating states:

[0065] Reinforcing bar positioning status: Before the floor slab concrete is poured, the positioning plate 2 passes through the reinforcing bar hole 3 through the reserved reinforcing bar 13 at the bottom of the precast column 12 to uniformly constrain and precisely limit all the reserved reinforcing bars 13, preventing them from deviating during the concrete pouring process.

[0066] Sealing status: After the floor slab concrete is poured, the positioning plate 2 is removed, and the sealing bottom plate 1 and sealing side plate 10 are lowered to the floor and fixed to form a closed cavity around the bottom of the precast column 12 for subsequent grouting operations.

[0067] The entire device has a modular structure that can be completely disassembled, making it easy to transport, store and reuse.

[0068] The positioning plate 2 is made of steel plate with a certain rigidity, and its outer plane dimensions are consistent with the cross-sectional side length of the precast column 12. Multiple rebar holes 3 are precisely drilled on the positioning plate 2 according to the position, diameter, and quantity of the reserved rebars 13 in the design drawings. The diameter of the rebar holes 3 is slightly larger than the diameter of the reserved rebars 13, so that the positioning plate 2 can smoothly pass through the reserved rebars 13, while also effectively constraining the rebars.

[0069] The positioning plate 2 also has holes on its four sides (or four corners) for installing the fixing plate 14 and the pre-embedded bolts 6.

[0070] The sealing base plate 1 is a strip-shaped plate component made of square steel or steel plate. Its length dimension is consistent with the side length of a single side of the precast column 12. The four sealing base plates 1 correspond to the four sides of the precast column 12, and together they form a rectangular frame base plate.

[0071] The upper surface of the sealing base plate 1 is used to contact or seal the bottom of the precast column 12, and its lower surface contacts the floor. The sealing base plate 1 is provided with mounting holes corresponding to the pre-embedded bolts 6.

[0072] The sealing side plate 10 is a vertically arranged plate-shaped component, also made of square steel or steel plate. The lower end of the sealing side plate 10 is fixedly connected to the outer edge of the sealing bottom plate 1, preferably by welding, forming an assembly with an overall "L" shaped cross-section. Each set of sealing bottom plate 1 and sealing side plate 10 corresponds to one side of the precast column 12.

[0073] Bolt holes 11 are provided on the side plate 10 of the sealing chamber for fastening to the pre-drilled bolt holes at the bottom of the precast column 12 via the side plate connecting bolts. To overcome the problem of misalignment of the holes that may be caused by the flatness deviation of the floor concrete, the bolt hole 11 is designed as an elongated oval hole or an extended hole to provide installation adjustment margin.

[0074] The fixing piece 14 is a strip-shaped metal connector with holes at both ends. The fixing piece 14 is used to detachably connect the positioning plate 2 and the sealing bottom plate 1 into one piece when the reinforcing bar is in the positioning state.

[0075] One end of the fixing plate 14 is connected to the positioning plate 2 via the base plate 9, the fixing plate bolt 7, and the fixing plate nut 8; the other end, after being installed in place, is also connected to the sealing chamber bottom plate 1 via the fixing plate bolt 7 and the fixing plate nut 8. The fixing plate 14 can rotate around the fixing plate bolt 7 to achieve connection or disconnection.

[0076] The embedded bolt 6 is a long bolt, the length of which is greater than the design thickness of the floor slab. Before the floor slab concrete is poured, the embedded bolt 6 is pre-embedded in the floor slab through the bolt holes 4 on the sealing base plate 1. During the sealing stage, the embedded bolt 6 is used to fix the sealing base plate 1, and the sealing base plate 1 is pressed tightly onto the floor surface by tightening the nuts 5.

[0077] The side plate connecting bolts are finished standard parts, used to pass through the bolt holes 11 on the sealing side plate 10 and be fastened to the bolt holes reserved at the bottom of the precast column 12 in the sealed state, so that the sealing side plate 10 is tightly attached to the side of the precast column 12 to form a seal.

[0078] Example 2

[0079] A construction method for a precise positioning and efficient sealing device for precast column reinforcement bars, comprising the following steps:

[0080] S1: Prefabrication of device components

[0081] Based on the cross-sectional side length of the precast column 12, the diameter, quantity, and location of the reserved reinforcing bars 13 in the design drawings, the following components are fabricated:

[0082] Process positioning plate 2, accurately drill rebar holes 3 and fixing plate 14, bolt mounting holes;

[0083] Based on the side length of the precast column 12, four sets of sealing bottom plates 1 and sealing side plates 10 are processed respectively, and the two are welded into an "L" shaped assembly.

[0084] Prepare standard auxiliary materials such as fixing plate 14, base plate 9, fixing plate bolt 7, fixing plate nut 8, pre-embedded bolt 6, nut 5, and side plate connecting bolts.

[0085] S2: Precast column hoisting and placement

[0086] Following the standard prefabricated construction process, the precast column 12 is hoisted to the designed position, and the pre-reserved steel bars 13 at its bottom are inserted into the formwork of the floor beam and slab.

[0087] S3: Installation of positioning plate (reinforcing bar positioning status)

[0088] After the floor reinforcement is tied and before the floor slab concrete is poured, the positioning plate 2 is passed through the reinforcement holes 3 on it from top to bottom through all the reserved reinforcement bars 13, so that the positioning plate 2 is placed horizontally at the set elevation of the reserved reinforcement bars 13. At this time, all the reserved reinforcement bars 13 are uniformly constrained by the positioning plate 2 and cannot be displaced in the horizontal direction.

[0089] S4: Installation of pre-embedded bolts

[0090] Insert the pre-embedded bolt 6 through the bolt hole 4 on the positioning plate 2 and extend it downwards into the floor slab formwork. The length of the pre-embedded bolt 6 should be greater than the design thickness of the floor slab to ensure that its lower end can be reliably anchored in the floor slab concrete. The upper end of the pre-embedded bolt 6 protrudes from the upper surface of the positioning plate 2 for subsequent installation of nuts.

[0091] S5: Temporary connection between the sealing bottom plate and the positioning plate

[0092] Place the four sets of sealing base plates 1 and sealing side plates 10 at their respective positions around the precast column 12. Adjust the position of the sealing base plates 1 so that they are directly below the positioning plate 2.

[0093] Using fixing plate 14: First, connect one end of fixing plate 14 to positioning plate 2 via base plate 9, fixing plate bolt 7, and fixing plate nut 8 (do not tighten). Then, rotate fixing plate 14 to align with the corresponding connecting hole on sealing chamber base plate 1, and then connect fixing plate 14 to sealing chamber base plate 1 via another set of fixing plate bolts 7 and fixing plate nuts 8. Finally, tighten all fixing plate nuts 8 to form a rigid whole between positioning plate 2 and sealing chamber base plate 1.

[0094] At this time, the sealing bottom plate 1 and the sealing side plate 10 are suspended below the positioning plate 2 and do not contact the floor formwork.

[0095] S6: Pouring floor slab concrete

[0096] The floor slab concrete was poured according to the design requirements and then vibrated and cured. During the concrete pouring process, the pre-reserved reinforcing bars 13 were effectively restrained by the positioning plate 2 and would not shift horizontally. The pre-embedded bolts 6 were firmly anchored in the floor slab concrete.

[0097] S7: Remove the positioning plate

[0098] This step should be performed after the floor slab concrete has reached its design strength.

[0099] First, loosen the fixing nut 8 on the fixing plate 14 that connects to one end of the sealing chamber bottom plate 1, and rotate the fixing plate 14 to disengage it from the sealing chamber bottom plate 1. At this time, the positioning plate 2 separates from the sealing chamber bottom plate 1.

[0100] Then, pull up or remove the positioning plate 2 to detach it from the reserved reinforcing bar 13. The positioning plate 2 can be retained for reuse on the next floor or in the next construction section.

[0101] S8: The bottom plate and side plates of the sealing chamber are installed in place (sealed chamber state).

[0102] Lower the four sets of sealing base plates 1 and sealing side plates 10 as a whole, so that the sealing base plates 1 land smoothly on the floor. Adjust the position so that the sealing base plates 1 are tightly attached to the bottom perimeter of the precast columns 12.

[0103] Insert the pre-embedded bolts 6 through the corresponding mounting holes on the sealing base plate 1, and tighten them initially with nuts 5 to fix the sealing base plate 1 to the floor.

[0104] S9: The sealing side panel is securely connected to the precast column.

[0105] The bolts are connected to the pre-drilled bolt holes at the bottom of the precast column 12 via bolts passing through bolt holes 11 on the side plate 10. Since bolt holes 11 are oblong, the vertical or horizontal position of the side plate 10 can be adjusted appropriately to overcome the misalignment of holes caused by floor flatness deviations.

[0106] Tighten all the side plate connecting bolts and nuts to ensure that the sealing side plate 10 fits tightly against the side wall of the precast column 12. At this time, the sealing bottom plate 1 and the sealing side plate 10 together form a closed, stable, and sealed cavity around the bottom of the precast column 12.

[0107] S10: Check the seal

[0108] Visually inspect for gaps between the sealing base plate 1 and the floor, and between the sealing side plate 10 and the side wall of the precast column 12. If necessary, flexible sealing strips or thin layers of sealant can be added to the contact surfaces, but in general, hard contact between metal plates is sufficient to meet the grouting sealing requirements.

[0109] S11: Grouting operation is carried out.

[0110] Grouting material is injected into the cavity between the column base and the floor through the pre-set grouting holes of the precast column 12. Due to the good overall rigidity and sealing performance of the sealing device, there will be no leakage or runoff of grout during the grouting process. The grouting material can fully fill the entire column base area to form a dense and void-free grouting layer.

[0111] S12: Dismantling device

[0112] Once the grouting material reaches the design and specification requirements, the equipment will be dismantled.

[0113] Loosen and remove the side panel connecting bolts and nuts;

[0114] Loosen and remove the nut 5 on the pre-embedded bolt 6;

[0115] Remove the four sets of sealing bottom plates 1 and sealing side plates 10;

[0116] Use a cutting tool to cut off the pre-embedded bolts 6 that are exposed on the floor slab surface (the exposed part is no longer used).

[0117] S13: Equipment Cleaning and Turnover

[0118] Clean, remove rust, and apply oil to the dismantled components such as the bottom plate 1, side plate 10, fixing plate 14, bolts, and nuts. Store them in a dry place for reuse in the next construction section or on the next floor.

[0119] Example 3

[0120] To verify the actual effect of the technical solution of the present invention, 32 prefabricated columns of a standard floor were selected as application objects in a prefabricated housing project and divided into an experimental group and a control group, with 16 prefabricated columns in each group. The same batch of prefabricated components, the same construction personnel and environmental conditions were used.

[0121] Experimental group: The prefabricated column reinforcement precise positioning and efficient sealing device and construction method described in Examples 1 and 2 above are adopted (the specific steps are as described in S1 to S13 in Example 2).

[0122] Control group: using traditional methods, i.e.:

[0123] Reinforcing bar positioning: The position of each reserved reinforcing bar is manually adjusted and welded to the beam and slab reinforcing bars. After the floor slab concrete is poured, the misaligned reinforcing bars are manually and forcefully corrected.

[0124] Column base sealing: After the precast column is hoisted into place, cement mortar is manually applied to seal the bottom of the column around its perimeter.

[0125] Both construction processes were subject to quality control and testing in accordance with relevant specifications.

[0126] The comparison of rebar positioning, sealing construction, grouting operation, quality and safety, and turnover cost between the experimental group and the control group is shown in Tables 1 to 5 below.

[0127] Table 1. Rebar positioning results in the experimental and control groups.

[0128]

[0129] Table 2. Sealing construction results of the experimental group and the control group.

[0130]

[0131] Table 3. Grouting results of the experimental group and the control group.

[0132]

[0133] Table 4. Construction quality and safety results of the experimental group and the control group.

[0134]

[0135] Table 5. Comparison of turnover costs between the experimental group and the control group.

[0136]

[0137] The data in Table 1 above show that the average deviation of the reinforcing bar position in the experimental group was only ±1.6 mm, with a maximum of ±2.5 mm, far less than the average deviation of ±8.3 mm and the maximum deviation of ±15.0 mm in the control group. This indicates that the present invention, through the uniform constraint of the positioning plate, can achieve one-time precise forming of the reinforcing bar position, completely eliminating the reliance on manual experience. In the control group, all reinforcing bars required strong correction after concrete pouring, a process that was not only time-consuming and labor-intensive but also inevitably caused damage to the hardened concrete and the reinforcing bars themselves. The present invention avoids this problem.

[0138] The data in Table 2 show that the sealing installation time of the experimental group was only 18 min / column, which was nearly 60% shorter than the 45 min / column of the control group. In addition, in the 0.3 MPa pressure sealing test, the experimental group showed no air leakage, while the control group showed multiple air leaks. This directly verifies the essential difference between steel sealing plates and cement mortar sealing in terms of integrity and sealing reliability.

[0139] Table 3 shows that the experimental group achieved zero grout leakage and a 100% pass rate for grout filling. In contrast, 43.75% of the precast columns in the control group experienced grout leakage or runoff during grouting, and ultrasonic testing revealed obvious voids or loose areas at the bottom of three columns. These voids directly weaken the force transmission capacity between the precast columns and the floor slab, posing a potential safety hazard. This invention eliminates this risk at its source.

[0140] The data in Tables 4 and 5 show that the experimental setup can be reused more than 10 times, with a single-use cost of only 38 yuan per column, far lower than the material and labor costs of the cement mortar in the control group. Furthermore, by eliminating the need for rebar alignment, cement mortar sealing, and repair after leakage, the experimental setup saves approximately 0.8 man-days of labor per column, reducing the standard floor construction period from 6.5 days to 4.5 days, a 31% reduction in construction time.

[0141] Therefore, this invention significantly outperforms traditional processes in key indicators such as rebar positioning accuracy, sealing performance, grouting quality, construction efficiency, and economy. In particular, the two core indicators of 0% grout leakage rate and 100% grout filling directly demonstrate that this invention can fundamentally solve the two long-standing quality problems in precast column construction: rebar misalignment and incomplete grouting.

Claims

1. A device for precise positioning and efficient sealing of precast column reinforcing bars, characterized in that, include: Positioning plate (2), sealing bottom plate (1), sealing side plate (10), fixing plate (14), pre-embedded bolts (6) and matching nuts (5) and connecting bolts to the side plate; The positioning plate (2) has a steel bar hole (3) corresponding to the position of the reserved steel bar (13) of the precast column (12); The sealing base plate (1) is set between the bottom of the precast column (12) and the floor surface; The sealing side plate (10) is fixedly connected to the sealing bottom plate (1) and forms a closed cavity around the bottom of the precast column (12); The fixing piece (14) is detachably connected to the positioning plate (2) and the sealing bottom plate (1). The pre-embedded bolts (6) are used to fix the bottom plate (1) of the sealing chamber to the floor. The side plate connecting bolts are used to connect the sealing side plate (10) to the bottom of the precast column (12).

2. The prefabricated column reinforcement precise positioning and efficient sealing device according to claim 1, characterized in that, The sealing base plate (1) and sealing side plate (10) are four independent assembly components, corresponding to the four sides of the precast column (12). The sealing base plate (1) and sealing side plate (10) in each assembly are connected by welding.

3. The prefabricated column reinforcement precise positioning and efficient sealing device according to claim 1, characterized in that, The bolt holes (11) on the sealing side plate (10) are oblong or elongated holes to provide installation adjustment margin.

4. The prefabricated column reinforcement precise positioning and efficient sealing device according to claim 1, characterized in that, The sealing bottom plate (1) and sealing side plate (10) are made of square steel.

5. The prefabricated column reinforcement precise positioning and efficient sealing device according to claim 1, characterized in that, The outer plane dimension of the positioning plate (2) is consistent with the cross-sectional side length of the precast column (12).

6. The prefabricated column reinforcement precise positioning and efficient sealing device according to claim 1, characterized in that, The two ends of the fixing plate (14) are detachably connected to the positioning plate (2) and the sealing bottom plate (1) respectively by fixing plate bolts (7) and fixing plate nuts (8).

7. The prefabricated column reinforcement precise positioning and efficient sealing device according to claim 1, characterized in that, The length of the pre-embedded bolt (6) is greater than the design thickness of the floor slab.

8. A construction method for a precast column reinforcement precision positioning and efficient sealing device as described in any one of claims 1 to 7, characterized in that, The steps are as follows: S1: Based on the position and diameter of the reserved steel bar (13) of the precast column (12), make a positioning plate (2), and make a sealing bottom plate (1) and sealing side plate (10) based on the side length of the precast column (12). S2: After the precast column (12) is hoisted into place, the positioning plate (2) is passed through the steel bar hole (3) and the reserved steel bar (13) is uniformly limited; S3: Insert the pre-embedded bolts (6) through the bolt holes (4) on the positioning plate (2) into the floor slab; S4: The positioning plate (2) and the sealing bottom plate (1) are detachably connected as one unit using a fixing piece (14); S5: Pour the floor slab concrete and cure it to the design strength; S6: Loosen the fixing piece (14) and remove the positioning plate (2); S7: Lower the sealing base plate (1) and sealing side plate (10) as a whole to the floor, and fix the sealing base plate (1) to the floor by pre-embedded bolts (6) and nuts (5); S8: The sealing side plate (10) is fastened to the pre-reserved bolt holes at the bottom of the precast column (12) by the side plate connecting bolts to form a closed cavity; S9: Perform grouting at the bottom of the precast column; S10: After the grouting material reaches the design strength, remove the bottom plate (1) and side plate (10) of the sealing chamber, and cut off the pre-embedded bolts (6) exposed on the floor slab.

9. The construction method of the prefabricated column reinforcement precise positioning and efficient sealing device according to claim 8, characterized in that, In S4, one end of the fixing plate (14) is connected to the positioning plate (2), and the other end is connected to the sealing bottom plate (1). The connection and separation of the two are achieved by rotating the fixing plate (14).

10. The construction method of the prefabricated column reinforcement precise positioning and efficient sealing device according to claim 8, characterized in that, In S7, after the sealing base plate (1) is fixed to the floor, the installation position is adjusted by the elongated bolt holes (11) on the sealing side plate (10) to overcome the floor flatness deviation.

Images