Hydraulic creeping formwork construction method for rectangular shaft tower construction

Abstract

The invention relates to the technical field of building construction, in particular to a hydraulic creeping formwork construction method for rectangular shaft tower construction. Comprising the following steps: mounting a creeping formwork device; layered climbing construction; inner and outer templates cooperatively work; safety protection; and a dismantling stage. According to the hydraulic climbing formwork construction method special for the rectangular shaft tower, through the technologies of an external climbing and internal attaching collaborative operation system, a sectional type hydraulic climbing rail, dynamic formwork height difference adjustment and the like, the construction efficiency is remarkably improved, the safety risk is reduced, meanwhile, standardized cyclic utilization of a formwork system is achieved, and the construction cost is reduced. And an innovative solution is provided for the construction of the towering rectangular concrete structure.

Description

Technical Field

[0001] The present invention relates to the technical field of building construction, and particularly relates to a hydraulic climbing formwork construction method for the construction of rectangular shaft towers. Background Art

[0002] In the construction of tall rectangular shaft towers in industrial and mining enterprises, traditional construction techniques such as the inverted formwork method and the slip formwork method have long dominated, but they have significant defects in terms of construction efficiency, safety, and economy.

[0003] The inverted formwork method uses a combination of scattered formwork and scaffolding for construction, and requires repeated erection of external cantilever scaffolds and formwork transportation. The process is cumbersome. For example, in the construction of a certain shaft tower, 25 times of inverted formwork are required, the single construction period reaches 7 - 8 days, the total construction period exceeds 200 days, and a large amount of turnover materials (such as steel sections, scaffolding) and labor costs need to be invested. In addition, the inverted formwork method relies on edge high-altitude operations, with great difficulty in safety protection, and is prone to quality problems such as formwork joint misalignment and concrete dripping, affecting the structural appearance and durability.

[0004] Although the slip formwork method can achieve continuous slip lifting, when encountering horizontal structures such as beam plates, it needs to stop and handle, resulting in construction interruption and extended construction period. At the same time, the slip formwork process has poor adaptability to changes in structural dimensions, and it is difficult to meet the design requirements of the shaft tower with a gradually reduced cross-section, and quality defects such as tensile cracks and pitted surfaces are prone to appear on the concrete surface.

[0005] In recent years, the climbing formwork technology has been gradually applied to high-rise buildings due to its characteristics of high modularization and mechanization, but there are still limitations in the field of rectangular shaft towers. Traditional climbing formwork systems are mostly designed for standard floor heights, and it is difficult to adapt to the special structure of shaft towers with variable floor heights and gradually reduced cross-sectional dimensions; the coordination between the inner and outer formworks is insufficient, resulting in too large an inclination angle of the tie bolts and affecting the wall verticality; in addition, the climbing of the formwork system relies on the cooperation of tower cranes, the construction efficiency is not fully released, and the safety protection measures have not formed a systematic plan. Summary of the Invention

[0006] The present invention proposes a hydraulic climbing formwork construction method dedicated to rectangular shaft towers. Through technologies such as a coordinated operation system of external climbing and internal attachment, segmented hydraulic climbing tracks, and dynamic formwork height difference adjustment, the construction efficiency is significantly improved, the safety risk is reduced, and at the same time, the standardized recycling of the formwork system is realized, providing an innovative solution for the construction of tall rectangular concrete structures.

[0007] The technical solution adopted by the present invention is: a hydraulic climbing formwork construction method for the construction of rectangular shaft towers, including the following steps:

[0008] Step 1, Installation of climbing formwork device: After the concrete pouring of the first-floor wall is completed, embed the embedded wall hanging seat sleeve, install the load-bearing bolts and hook connection seats, hoist and connect the climbing frame body into a whole, set up protective railings and safety nets, and configure the hydraulic climbing system;

[0009] Step 2, Layered climbing construction: Each layer of construction includes binding steel bars, closing the formwork and pouring concrete. After curing to a strength ≥ 15 MPa, drive the frame body to climb along the embedded track through the hydraulic system, and synchronously adjust the positions of the inner and outer formworks;

[0010] Step 3, Cooperative operation of inner and outer formworks: The hydraulic climbing formwork system is used for the outer wall, and the attached large formwork is used for the inner wall. The main and secondary back ribs of the inner and outer formworks are respectively made of "I"-shaped double channel steels and "L"-shaped channel steels, and are fixed by tie bolts;

[0011] Step 4, Safety protection: A fully enclosed safety net is set on the outside of the climbing formwork frame body, steel pipe railings are used at the edge of the platform, and the climbing device is configured with a self-locking anti-falling function;

[0012] Step 5, Demolition stage: After the top-layer construction is completed, disassemble the climbing frame section by section and hoist it, and retain the formwork system for recycling.

[0013] As a further improvement of the present invention, in the above Step 1, the installation of the hook connection seat uses special load-bearing bolts. The horizontal and vertical positions are determined according to the bearing capacity calculation of the shear wall structure, and the installation deviation ≤ 5 mm. The hook connection seat is closely attached to the wall surface through fine-tuning bolts.

[0014] As a further improvement of the present invention, in the above Step 2, the formwork assembly includes the following steps: Fix the main and secondary back ribs on the assembly platform, weld the square tube formwork frame and the secondary ribs; Lay 15-mm-thick plywood, and seal the joints with double-sided adhesive strips. The edge of the board overlaps 30 mm on the center line of the square tube; An operation platform is added to the top of the outer formwork, and the inner formwork is configured with detachable legs, and the legs are fixed to the main and secondary back ribs through pin shafts.

[0015] As a further improvement of the present invention, in the above Step 2, the climbing track of the hydraulic climbing system adopts a segmented design. The length of each section of the track matches the floor height. During climbing, it is alternately fixed through the jacking seat and the hook connection seat to achieve continuous climbing of the frame body.

[0016] As a further improvement of the present invention, the assembly platform is built with scaffolding steel pipes. The platform size is 10 m in length × 4.5 m in width × 1.0 m in height, the spacing of the vertical poles is 1.2 m, and the error of the horizontal bars ≤ 2 mm to ensure the flatness of the formwork.

[0017] As a further improvement of the present invention, the height difference between the inner and outer formworks is controlled by adjusting the fine-tuning bolts of the inner formwork legs and the outer formwork moving device, so that the height difference between the main and secondary back ribs of the inner and outer formworks ≤ 100 mm, and the inclination angle of the tie bolts ≤ 5°.

[0018] As a further improvement of the present invention, the concrete pouring adopts the layered and segmented method, with each segment having a height of 3.9 - 4.0 m. After pouring, the verticality of the wall is monitored in real time by a laser rangefinder, and correction is immediately carried out when the deviation exceeds 3 mm.

[0019] As a further improvement of the present invention, the climbing formwork frame is connected into groups by Bailey trusses. Each group of climbing frames covers 3 - 4 positions, and adjacent climbing frames are rigidly connected by channel steel to form an integral stress system.

[0020] As a further improvement of the present invention, the optimization of the construction period includes: reducing the rental height of the external scaffolding to 12 m and shortening the rental period to 15 days; reducing the number of uses of the cantilevered steel profiles from 4 times to 1 time, and using a detachable steel structure for the diagonal bracing reinforcement of the cantilevered floors.

[0021] As a further improvement of the present invention, the method for recycling the formwork is as follows: the cut surface of the plywood is processed by a planer and used for non-exposed surfaces; the main back ribs and the square tube formwork frames are designed according to the modulus standardization and adapted to the shaft towers with different cross-sectional dimensions; after demolition, the formwork system is classified and coded for storage and directly used for the next project.

[0022] The beneficial effects of the present invention are as follows: (1) Through the "cooperative operation system of external climbing and internal attachment" and the "segmented hydraulic climbing track" technologies, the present invention realizes the synchronous construction of the internal and external formworks and the continuous climbing of the formwork frame. The single-layer construction period is shortened to 7 days, and the total construction period is reduced by more than 10 days compared with the traditional inverted formwork method. Combining the dynamic adjustment of the formwork height difference (the height difference of the main back ribs ≤ 100 mm, the inclination of the tie bolts ≤ 5°) and the real-time monitoring by the laser rangefinder, the verticality deviation of the wall is controlled within 3 mm, effectively solving the common quality problems such as offset and running down in the traditional process, and ensuring the flatness of the appearance and the structural safety of the shaft tower.

[0023] (2) The standardized formwork system (modular design of the main back ribs, secondary utilization of the cut surface of the plywood) and the detachable cantilever reinforcement structure of the present invention improve the formwork turnover utilization rate by 60% and reduce the rental costs of steel profiles and scaffolding by 70%. At the same time, the application of the fully enclosed protective net and the self-locking anti-falling climbing device reduces the risk of high-altitude operations, comprehensively saving 30% of the safety protection investment, and achieving a double breakthrough in economy and safety. Description of the Drawings

[0024] Figure 1 It is a flow chart of a hydraulic climbing formwork construction method for the construction of a rectangular shaft tower according to the present invention. Detailed Embodiments

[0025] In order to make the technical problems, technical solutions and beneficial effects to be solved by the present application clearer, the present application will be further described in detail below with reference to the drawings and embodiments. It should be understood that the embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0026] The present invention provides a hydraulic climbing formwork construction method for the construction of rectangular shaft towers, including the following steps:

[0027] Step 1, installation of the climbing formwork device: After the concrete pouring of the first-floor wall is completed, embed the wall-attached hanging seat sleeve, install the load-bearing bolts and hook connection seats, hoist and connect the climbing frame body into a whole, erect the protective railing and safety net, and configure the hydraulic climbing system;

[0028] Step 2, layered climbing construction: Each layer of construction includes binding steel bars, closing the formwork and pouring concrete, and after curing to a strength ≥ 15 MPa, drive the frame body to climb along the embedded track through the hydraulic system, and synchronously adjust the positions of the inner and outer formworks;

[0029] Step 3, coordinated operation of the inner and outer formworks: The outer wall adopts a hydraulic climbing formwork system, and the inner wall adopts attached large formworks. The main and secondary back ribs of the inner and outer formworks respectively adopt "one"-shaped double channel steels and "L"-shaped channel steels, and are fixed by tie bolts;

[0030] Step 4, safety protection: A fully enclosed protective net is arranged on the outside of the climbing formwork frame body, the edge of the platform is provided with steel pipe railings, and the climber is configured with a self-locking anti-falling function;

[0031] Step 5, demolition stage: After the top-layer construction is completed, disassemble the climbing frame section by section and hoist it, and retain the formwork system for recycling.

[0032] In step 1 of the present invention, the installation of the hook connection seat adopts special load-bearing bolts, and the horizontal and vertical positions are determined according to the bearing capacity calculation of the shear wall structure. The installation deviation ≤ 5 mm, and the hook connection seat is closely attached to the wall surface through fine-tuning bolts. The concrete pouring adopts the layered and segmented method, with each section height of 3.9 - 4.0 m. After pouring, the wall verticality is monitored in real time by a laser rangefinder, and when the deviation exceeds 3 mm, it is corrected immediately.

[0033] In step 2 of the present invention, the formwork assembly includes the following steps: Fix the main and secondary back ribs on the assembly platform, weld the square tube formwork frame and the secondary ribs; Lay 15-mm-thick plywood, and seal the joints with double-sided adhesive strips. The edge of the board overlaps the center line of the square tube by 30 mm; An upper operation platform is added to the outer formwork, and the inner formwork is configured with detachable legs, and the legs are fixed to the main and secondary back ribs through pin shafts. The climbing track of the hydraulic climbing system adopts a segmented design, and the length of each section of the track matches the storey height. During climbing, it is alternately fixed through the jacking seat and the hook connection seat to realize the uninterrupted climbing of the frame body. The assembly platform is erected with scaffolding steel pipes, the platform size is 10 m in length × 4.5 m in width × 1.0 m in height, the vertical rod spacing is 1.2 m, and the horizontal rod error ≤ 2 mm to ensure the formwork flatness.

[0034] In step three of the present invention, the height difference between the inner and outer formworks is controlled by adjusting the fine-tuning bolts of the inner formwork legs and the outer formwork moving device, so that the height difference between the main back ribs of the inner and outer formworks ≤ 100 mm, and the inclination angle of the tie bolts ≤ 5°.

[0035] In step four of the present invention, the climbing formwork frame is connected into groups by Bailey trusses. Each group of climbing frames covers 3 - 4 machine positions, and adjacent climbing frames are rigidly connected by channel steel to form an integral stress-bearing system.

[0036] The optimization of the construction period in the present invention includes: reducing the rental height of the external scaffolding to 12 m and shortening the rental period to 15 days; reducing the number of uses of the cantilevered profiled steel from 4 times to 1 time, and using a detachable steel structure for the diagonal bracing reinforcement of the cantilevered floor.

[0037] The method for recycling the formworks in the present invention is as follows: the cut surface of the plywood is processed by an electric planer and used for non-exposed surfaces; the main back ribs and the square tube formwork frames are designed standardly according to the modulus to adapt to shaft towers with different cross-sectional sizes; after demolition, the formwork system is classified and coded for storage and directly used for the next project.

[0038] Example:

[0039] (I) Project overview

[0040] The main shaft tower is a rectangular concrete structure with a total building height of 99 m, a total of 9 floors, and a plane size of 18 m × 20 m (the cross-section changes to 18 m × 24 m above 80.15 m). The thickness of the outer wall is reduced in segments (1000 mm below 7 m, 700 mm below 25 m, 500 mm below 60.65 m, and 400 mm above 60.65 m). The design requires a tight construction period, and it is necessary to shorten the construction period and control the cost while ensuring the quality.

[0041] (II) Construction preparation

[0042] Materials and equipment: (1) Formwork system: The outer formwork uses "I"-shaped double 12# channel steel main back ribs, and the inner formwork uses "L"-shaped channel steel main back ribs; 15 mm thick plywood, square tube secondary ribs (2.5 × 60 × 80 mm). (2) Climbing device: Hydraulic climbing system (including segmented tracks, jacking seats, self-locking anti-falling devices), Bailey truss frame, detachable cantilevered profiled steel. (3) Monitoring instruments: Laser rangefinder, concrete strength rebound instrument.

[0043] Personnel allocation: Professional climbing formwork technical team (including 1 technical person in charge and 5 operators), who are on duty after passing the safety training.

[0044] (III) Implementation steps

[0045] Step 1, Installation of climbing formwork device: (1) Construction of the first-floor wall: Pour the concrete of the first-floor wall, and embed the wall-attached hanging seat sleeves. The sleeve spacing is determined according to the bearing capacity of the shear wall (horizontal spacing ≤ 1.2 m, vertical spacing ≤ 1.5 m). (2) Installation of hook connection seats: Fix the hook connection seats with special load-bearing bolts, with an installation deviation ≤ 5 mm, and closely fit with the wall surface through fine-tuning bolts. (3) Assembly of the frame: Lift and install the climbing frame, and rigidly connect adjacent frames into groups using channel steel (each group covers 4 positions), erect a fully enclosed safety net and steel pipe railings, and configure a hydraulic climbing system.

[0046] Step 2, Layered climbing construction: (1) Formwork assembly: Fix the main backing ribs on the assembly platform (10 m × 4.5 m × 1.0 m, vertical rod spacing 1.2 m), weld the square tube formwork frame and secondary ribs. Lay plywood, seal the joints with double-sided adhesive strips, and the edge of the board overlaps 30 mm with the center line of the square tube. Install an operation platform (cantilever scaffold + double-layer plywood) at the top of the outer formwork. (2) Concrete pouring: The height of each section is 3.9 m, pour in layers and vibrate thoroughly. After pouring, use a laser rangefinder to monitor the verticality in real time (correct immediately when the deviation exceeds 3 mm). (3) Climbing operation: After the concrete strength reaches 15 MPa, start the hydraulic system to drive the frame to climb along the segmented track (the length of each track is 3.9 m), and alternately fix through the jacking seat and the hook connection seat to achieve continuous climbing.

[0047] Step 3, Coordinated operation of inner and outer formworks: The outer formwork climbs synchronously through the hydraulic system, and the inner formwork uses attached large formworks, which are quickly installed through detachable legs (fixed with pins). Dynamically adjust the height difference between the inner and outer formworks: Through the fine-tuning bolts of the inner formwork legs and the moving device of the outer formwork, control the height difference of the main backing ribs ≤ 80 mm, and the inclination angle of the tie bolts ≤ 3°.

[0048] Step 4, Safety protection: A fully enclosed safety net (outer hanging dense mesh safety net) is installed on the outside of the frame, and 1.2 m high steel pipe railings are set at the edge of the platform. The climber is equipped with a self-locking anti-falling function to ensure zero risk during the climbing process.

[0049] Step 5, Demolition and recycling: After the top-layer construction is completed, disassemble the climbing frame into single bays and lift them to the ground by tower crane. Classify and code-store the formwork system: The cut surface of the plywood is processed by an electric planer and used for non-exposed surfaces; the main backing ribs and formwork frames are designed according to the modulus standardization and are adapted to the cross-section size of the next project.

[0050] (4) Construction optimization and effect verification

[0051] Duration optimization: The rental height of the external scaffolding is reduced from the original 25 m to 12 m, and the rental period is shortened from 209 days to 15 days; the number of uses of the cantilever steel profiles is reduced from 4 times to 1 time, saving 10 days of construction period (total construction period 199 days).

[0052] Cost control: The formwork turnover rate is increased by 60%, and the rental costs of profiled steel and scaffolding are reduced by 70% (the total cost is reduced from 397,888 yuan to 130,355 yuan).

[0053] Quality acceptance: The deviation of the wall verticality is ≤2mm, without any offset or running down phenomenon, and the main structure acceptance is qualified at one time.

[0054] (V) Conclusion

[0055] Through the efficient collaborative operation, dynamic adjustment and standardized recycling of the hydraulic climbing formwork technology in this embodiment, the construction period of the rectangular shaft tower is compressed, the cost is reduced and the quality is improved, verifying the feasibility and superiority of this method, and providing a reliable technical reference for similar projects.

[0056] In summary, a hydraulic climbing formwork construction method for rectangular shaft tower construction of the present invention not only significantly improves the construction efficiency, reduces the cost, but also ensures the project quality, demonstrating its great potential and broad application prospects in the field of high-rise building construction. Through refined management and technological innovation, this method has successfully overcome many limitations of traditional construction methods, providing new ideas and solutions for the rapid, safe and high-quality construction of rectangular shaft towers and other similar structures. In the future, with the continuous progress of technology and the in-depth application, this method is expected to be further optimized and popularized, contributing to the sustainable development of the construction industry.

[0057] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A hydraulic climbing formwork construction method for rectangular well tower construction, characterized in that: The following steps are involved: Step 1: Installation of climbing formwork device: After the first floor wall concrete is poured, pre-embed the wall mount sleeve, install the load-bearing bolts and hook connector, hoist the climbing frame and connect it into a whole, set up guardrails and safety nets, and configure the hydraulic climbing system; Step 2: Layered climbing construction: Each layer of construction includes tying steel bars, closing the mold to pour concrete, and curing until the strength is ≥15MPa. The frame is driven by the hydraulic system to climb along the embedded track and the positions of the inner and outer templates are adjusted synchronously. Step 3: The inner and outer formworks work together: the outer wall uses a hydraulic climbing formwork system, the inner wall uses an attached large formwork, and the inner and outer formworks use "I" type double channel steel and "L" type channel steel as the main back ribs, and are fixed by tension bolts; Step 4: Safety protection: A fully enclosed protective net is set on the outside of the climbing formwork frame, steel pipe railings are used on the edge of the platform, and the climber is equipped with a self-locking anti-fall function; Step 5, dismantling stage: After the top floor construction is completed, disassemble the climbing frame section by section and lift it, retaining the formwork system for recycling.

2. A hydraulic climbing formwork construction method for rectangular shaft tower construction according to claim 1, characterized in that: In the step 1, the hook connection seat is installed using special load-bearing bolts, and the horizontal and vertical positions are determined according to the shear wall structure bearing capacity calculation, the installation deviation is ≤5mm, and the hook connection seat is tightly fitted to the wall surface through fine-tuning bolts.

3. A hydraulic climbing formwork construction method for rectangular shaft tower construction according to claim 1, characterized in that: In the step 2, the template assembly includes the following steps: fixing the main back rib on the assembly platform, welding the square tube template frame and the secondary rib; laying 15mm thick plywood, sealing the joints with double-sided tape, and overlapping the board edges 30mm from the center line of the square tube; adding a top operating platform to the outer template, and configuring the inner template with detachable legs, which are fixed to the main back rib by pins.

4. A hydraulic climbing formwork construction method for rectangular shaft tower construction according to claim 1, characterized in that: In the step 2, the climbing track of the hydraulic climbing system adopts a segmented design, and the length of each track section matches the floor height. During climbing, the jacking seat and the hook connecting seat are alternately fixed to achieve uninterrupted climbing of the frame.

5. A hydraulic climbing formwork construction method for rectangular shaft tower construction according to claim 3, characterized in that: The assembly platform is constructed with scaffolding steel pipes, the platform dimensions are 10m long × 4.5m wide × 1.0m high, the vertical pole spacing is 1.2m, and the horizontal pole error is ≤2mm to ensure the flatness of the template.

6. A hydraulic climbing formwork construction method for rectangular shaft tower construction according to claim 1, characterized in that: In the step three, the height difference between the inner and outer templates is controlled by adjusting the fine-tuning bolts of the inner template legs and the outer template moving device, so that the height difference between the main back ribs of the inner and outer templates is ≤100mm and the inclination angle of the tension bolts is ≤5°.

7. A hydraulic climbing formwork construction method for rectangular shaft tower construction according to claim 1, characterized in that: In the step 1, the concrete is poured in layers and sections, with each section being 3.9-4.0 m high. After pouring, the verticality of the wall is monitored in real time by a laser rangefinder, and correction is made immediately when the deviation exceeds 3 mm.

8. A hydraulic climbing formwork construction method for rectangular shaft tower construction according to claim 1, characterized in that: In the step 4, the climbing formwork frames are connected into groups using Bailey plates, each group of climbing frames covers 3-4 machine positions, and adjacent climbing frames are rigidly connected by channel steel to form an overall force-bearing system.

9. A hydraulic climbing formwork construction method for rectangular shaft tower construction according to claim 1, characterized in that: The construction period optimization includes: the rental height of the external scaffolding is reduced to 12m, and the rental period is shortened to 15 days; the number of times the cantilever steel is used is reduced from 4 times to 1 time, and the cantilever layer diagonal brace reinforcement adopts a detachable steel structure.

10. A hydraulic climbing formwork construction method for rectangular shaft tower construction according to claim 1, characterized in that: The template recycling method is as follows: the plywood cut surface is processed by an electric planer and then used for non-exposed surfaces; the main back ribs and square tube template frames are designed according to modular standardization to adapt to well towers of different cross-sectional sizes; after dismantling, the template system is classified, coded and stored and directly used in the next project.

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