Cantilever formwork framework for double-chamber hollow thin-walled high-pier construction and construction method thereof

Abstract

The application discloses a kind of cantilever formwork framework and its construction method for double-chamber hollow thin-walled high pier construction, comprising: triangular support frame, separable fixed connection assembly in high pier;Hoisting platform, fixed connection assembly is in the bottom end of triangular support frame;Construction platform, fixed connection assembly is in the top end of triangular support frame;Main back frame, including back sliding cross, back vertical frame and inclined strut;Back sliding cross can be positioned sliding assembly in the top end surface of construction platform;The bottom end of back vertical frame and the end of back sliding cross close to high pier are hingedly connected assembly;Inclined strut is fixed telescopic rod, and the end of inclined strut along its telescopic direction and the side end surface of back vertical frame away from high pier are connected assembly, the other end of inclined strut along its telescopic direction and the end of back sliding cross away from high pier are connected assembly;Formwork body, separable fixed connection is connected between back vertical frame.Solve the technical problems existing in the formwork system of prior art for mountain high pier construction.

Description

Technical Field

[0001] This invention relates to the technical field of cantilever formwork systems for high piers in mountainous areas, and more specifically, to a cantilever formwork structure and its construction method for the construction of double-chamber hollow thin-walled high piers. Background Technology

[0002] Currently, the main formwork systems used for high pier construction in mountainous areas are hydraulic slipform, flip-form, climbing form, and cantilever formwork. Among these methods, slipform construction, while highly efficient, suffers from fundamental quality risks, resulting in a dull pier appearance and poor pier alignment. Formwork flipping, a large-formwork method, offers generally better concrete appearance, but its slower pace, requiring simultaneous construction at multiple piers, incurs significant costs, and hinders the turnover of machinery. Climbing formwork combines the advantages of large formwork and slipform, offering generally better concrete appearance, but its construction speed remains comparable to flip formwork, negatively impacting construction progress. Furthermore, traditional cantilever formwork, while using ordinary plywood panels and main back braces connecting the formwork, main beam triangular frame, and adjustable diagonal braces, suffers from low design and construction quality, complex and bulky formwork assembly, high site requirements and tower crane utilization, significant safety risks during installation, adjustment, demolding, and formwork retraction, long segmental construction cycles, and high costs, hindering the achievement of project progress targets.

[0003] Therefore, optimizing the formwork system, improving its adaptability, and enhancing construction efficiency are of paramount importance. Summary of the Invention

[0004] Therefore, the present invention provides a cantilever formwork structure and its construction method for the construction of double-chamber hollow thin-walled high piers, in order to solve the above-mentioned technical problems of the formwork system for the construction of high piers in mountainous areas.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A cantilever formwork structure for the construction of double-chamber hollow thin-walled high piers includes:

[0007] A triangular support frame is used for detachable and fixed assembly to the high pier;

[0008] The hoisting platform is fixedly assembled to the bottom end of the triangular support frame;

[0009] The construction platform is fixedly assembled to the top of the triangular support frame;

[0010] The main backrest frame comprises a backrest sliding cross frame, a backrest vertical frame and a diagonal support rod; the backrest sliding cross frame is fixedly and slidably arranged at the top end surface of the construction platform; the bottom end of the backrest vertical frame is hingedly connected to the end of the backrest sliding cross frame close to the high pier; the diagonal support rod is a fixed telescopic rod, and one end of the diagonal support rod along the telescopic direction is rotatably connected to the side end surface of the backrest vertical frame away from the high pier, and the other end of the diagonal support rod along the telescopic direction is rotatably connected to the end of the backrest sliding cross frame away from the high pier.

[0011] The template body is detachably connected to the backrest vertical frame.

[0012] Based on the above technical scheme, the present application is further described as follows:

[0013] As a further scheme of the present application, the triangular support frame comprises a support frame body, a mounting embedded part and an embedded part support;

[0014] The support frame body is a triangular support frame body, and the vertical side straight line edge of the triangular support frame body is fixedly connected with the embedded part support; the embedded part support is detachably and bucklingly connected to the mounting embedded part; the mounting embedded part is embedded in the high pier to fix the support frame body to the high pier.

[0015] As a further scheme of the present application, the horizontal side straight line edge of the support frame body is further fixedly connected with a first platform vertical frame corresponding to the side of the construction platform away from the high pier.

[0016] As a further scheme of the present application, the hoisting platform is fixedly and slidably arranged at the bottom end of the vertical side straight line edge of the triangular support frame body, and the hoisting platform is arranged in abutment with the high pier.

[0017] The construction platform is fixedly and slidably arranged at the horizontal side straight line edge of the support frame body.

[0018] As a further scheme of the present application, the main backrest frame further comprises a backrest adjusting seat;

[0019] The backrest vertical frame comprises a plurality of assembly vertical rods and a plurality of assembly horizontal rods arranged perpendicularly; the bottom end of each of the assembly vertical rods is hingedly connected to the end of the backrest sliding cross frame close to the high pier, and each of the assembly horizontal rods is slidably arranged at the assembly vertical rods.

[0020] The backrest adjusting seat has a screw end, the assembly vertical rods are vertically provided with a plurality of positioning holes, and the screw end of the backrest adjusting seat is screw-connected to one of the positioning holes of the assembly vertical rods after extending through the assembly horizontal rods.

[0021] As a further scheme of the present application, a plurality of back brace members are respectively fixedly connected to the side end face of the assembly horizontal rod away from the assembly vertical rod.

[0022] The template body is detachably fixedly connected to a plurality of groups of connecting claws on the side end face facing the assembly horizontal rod, and a plurality of groups of the connecting claws and a plurality of the back brace members are respectively and one-to-one detachably connected.

[0023] As a further scheme of the present application, it further comprises:

[0024] The cantilevered platform comprises a cantilevered base plate and a second platform stand.

[0025] The cantilevered base plate is transversely fixedly connected to the top end of the template body, and the second platform stand is vertically fixedly connected to the side end of the cantilevered base plate away from the template body.

[0026] As a further scheme of the present application, it further comprises:

[0027] The spraying maintenance system comprises a water storage tank, a water pump and a spraying head.

[0028] The spraying head is provided with a plurality of groups, the water storage tank is connected to a plurality of groups of the spraying head through a water pipe, the water pipe is provided with the water pump corresponding to the water storage tank, and a plurality of groups of the spraying head are respectively arranged around the hoisting platform on the outer side of the high pier.

[0029] As a further scheme of the present application, the top end of the template body is further fixedly connected to a plurality of groups of hooks.

[0030] A construction method using the cantilevered formwork for the construction of a double-chamber hollow thin-walled high pier, specifically comprising the following steps:

[0031] S1: construction of a stiff skeleton;

[0032] S2: construction of pier body reinforcement;

[0033] S3: construction of pouring of the first section of the pier body;

[0034] S4: installation of a triangular support frame and a construction platform, installation of a cantilevered platform and pouring construction of the second section;

[0035] S401: installation of a triangular support frame;

[0036] S402: installation of a construction platform;

[0037] S403: hoisting of a triangular support frame and a construction platform;

[0038] S404: installation of a main back brace frame and a cantilevered platform;

[0039] S405: hoist the formwork body, the main back frame and the cantilever platform;

[0040] S5: formwork frame climbing, third section concrete pouring is carried out;

[0041] S6: top sealing section construction

[0042] The present application has the following beneficial effects:

[0043] The structure can facilitate the processing of embedded bolt holes and defects on the concrete surface by means of the hoisting platform, and can complete concrete curing by utilizing the hoisting platform and the spraying curing system, and the formwork body is a detachable formwork and the formwork body and the main back frame can be assembled, so that the overall disassembly is more convenient, and various sizes of formworks can be flexibly assembled within a certain range and degree. Compared with the traditional cantilever formwork, the formwork assembly is simple, fast, the site requirement is low, the tower crane utilization rate is low, it is economical and practical, the degree of mechanization and standardization is high, the segment construction period is reduced, the safety risk is low, and the functional practicability is improved. BRIEF DESCRIPTION OF DRAWINGS

[0044] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced below. The structures, proportions, sizes, etc. shown in the present specification are only used to cooperate with the content disclosed in the specification, so that those skilled in the art can understand and read. Any modification of structure, change of proportion relationship or adjustment of size, which does not affect the effects and purposes that can be achieved by the present application, should still fall within the scope of the technical content disclosed by the present application.

[0045] Figure 1 The top view structural schematic diagram of the cantilever formwork structure for double-chamber hollow thin-wall high pier construction provided by the embodiment of the present application after installation is complete.

[0046] Figure 2 The overall side view structural schematic diagram of the cantilever formwork structure for double-chamber hollow thin-wall high pier construction provided by the embodiment of the present application after installation is complete.

[0047] Figure 3 The arrangement structural schematic diagram of the spraying curing system in the cantilever formwork structure for double-chamber hollow thin-wall high pier construction provided by the embodiment of the present application.

[0048] Figure 4 The state structural schematic diagram of a single cantilever formwork in the cantilever formwork structure for double-chamber hollow thin-wall high pier construction provided by the embodiment of the present application when climbing.

[0049] Figure 5The installation structure diagram of the formwork body in the cantilever formwork framework for the double-chamber hollow thin-wall high-pier construction provided by the embodiment of the present application is shown.

[0050] Figure 6 The assembly structure diagram of the triangular support frame in the cantilever formwork framework for the double-chamber hollow thin-wall high-pier construction provided by the embodiment of the present application is shown.

[0051] Figure 7 The assembly structure diagram of the triangular support frame installation construction platform in the cantilever formwork framework for the double-chamber hollow thin-wall high-pier construction provided by the embodiment of the present application is shown.

[0052] Figure 8 The state structure diagram of the triangular support frame and the construction platform after installation in the cantilever formwork framework for the double-chamber hollow thin-wall high-pier construction provided by the embodiment of the present application is shown.

[0053] Figure 9 The assembly structure diagram of the main back frame, the formwork body and the cantilever platform in the cantilever formwork framework for the double-chamber hollow thin-wall high-pier construction provided by the embodiment of the present application is shown.

[0054] Figure 10 The isometric structure diagram of a single set of cantilever formwork in the cantilever formwork framework for the double-chamber hollow thin-wall high-pier construction provided by the embodiment of the present application is shown.

[0055] Figure 11 The assembly structure diagram of the installation embedded part in the cantilever formwork framework for the double-chamber hollow thin-wall high-pier construction provided by the embodiment of the present application is shown.

[0056] In the drawings, the component list represented by each sign is as follows:

[0057] Triangular support frame 1: support frame body 11, first platform vertical frame 12, installation embedded part 13, installation bolt 131, climbing cone 132, high-strength bolt 133, embedded part support 14;

[0058] Hoisting platform 2; construction platform 3;

[0059] Main back frame 4: back frame sliding horizontal frame 41, back frame vertical frame 42, assembly vertical rod 421, assembly horizontal rod 422, inclined support 43, inclined rod 44, back frame fastener 45, back frame adjusting seat 46;

[0060] Formwork body 5: connecting claw 51, lifting hook 52;

[0061] Cantilever platform 6: cantilever bottom plate 61, second platform vertical frame 62;

[0062] Spray maintenance system 7: water storage pool 71, water pump 72, spray head 73.

[0063] High pier a; cushion beam b. DETAILED DESCRIPTION

[0064] The present application will be described with respect to particular embodiments, with reference to the drawings, in which are shown by way of illustration embodiments in accordance with the application. These embodiments are described in sufficient detail to enable those skilled in the art to practice the application, and it is to be understood that other embodiments can be utilized and that logical, mechanical, electrical and other changes can be made without departing from the scope of the present application. The following detailed description is, therefore, not to be taken in a limiting sense.

[0065] The terms such as "upper", "lower", "left", "right", "intermediate" and the like as used herein are only intended to facilitate the description of the present application and are not intended to limit the scope of the present application. Changes in relative positions or adjustments without substantial changes in technical content are also considered to be within the scope of the present application.

[0066] As shown in Figures 1 to 10 , the embodiment of the present application provides a cantilever formwork framework for double-chamber hollow thin-walled high pier construction, which comprises a triangular support frame 1, a hoisting platform 2, a construction platform 3, a main back frame 4, a formwork body 5, a cantilever platform 6 and a spraying maintenance system 7, so as to facilitate the processing of pre-buried bolt holes and defects on the surface of concrete by means of the hoisting platform 2, and to complete the concrete maintenance by cooperation of the hoisting platform 2 and the spraying maintenance system 7. The formwork body 5 is a detachable formwork, and the formwork body 5 and the main back frame 4 can be assembled, so that the overall assembly is more convenient, and various sizes of formworks can be flexibly assembled within a certain range and degree. Compared with the traditional cantilever formwork, the present application has the advantages of simple and fast formwork assembly, low site requirement, low utilization rate of tower crane, economy and practicality, high degree of mechanization and standardization, reduced segment construction period, low safety risk and the like, and improved functional practicality. The specific settings are as follows:

[0067] Please refer to Figures 1 to 5 , the triangular support frame 1 comprises a support frame body 11, a mounting pre-buried part 13 and a buried part support 14; wherein the support frame body 11 is a triangular support frame body, and the vertical side straight line edge of the triangular support frame body 11 is fixedly connected and assembled with the buried part support 14, and the buried part support 14 and the mounting pre-buried part 13 are connected by separable buckling fixed assembly, so as to realize separable fixed assembly of the support frame body 11 on the high pier a by pre-buried mounting pre-buried part 13 on the high pier a.

[0068] The hoisting platform 2 is fixedly assembled at the bottom end of the vertical side straight edge of the triangular support frame body 11, and is arranged in abutment with the high pier a, so as to facilitate the processing of the embedded bolt hole formed by the demolition and the surface defect of the concrete in the construction process by means of the hoisting platform 2, and the spraying maintenance system 7 can be used to effectively complete the spraying maintenance of the poured concrete by cooperating with the hoisting platform 2.

[0069] The construction platform 3 is fixedly assembled at the horizontal side straight edge of the support frame body 11, so that the construction platform 3 can be used as a working platform for completing the main construction, thereby ensuring the overall functionality.

[0070] Preferably, the horizontal side straight edge of the support frame body 11 is further fixedly assembled with a first platform stand 12 on the side away from the high pier a, so as to use the first platform stand 12 as a protective guardrail, thereby effectively improving the work safety of the construction personnel on the construction platform 3.

[0071] Please refer to Figures 4 to 10 The main back brace frame 4 comprises a back brace sliding cross frame 41, a back brace stand 42, a diagonal support base 43, a diagonal support rod 44, a back brace fastener 45, and a back brace adjusting seat 46. The back brace sliding cross frame 41 is fixedly assembled at the top end face of the construction platform 3, so that the back brace sliding cross frame 41 can slide based on the construction platform 3. The bottom end of the back brace stand 42 is hingedly assembled with one end of the back brace sliding cross frame 41 close to the high pier a, and the side end face of the back brace stand 42 away from the high pier a is fixedly assembled with the diagonal support base 43. The diagonal support rod 44 is a fixed telescopic rod, one end of the diagonal support rod 44 along the telescopic direction is rotatably connected with the diagonal support base 43, and the other end of the diagonal support rod 44 along the telescopic direction is rotatably connected with the other end of the back brace sliding cross frame 41 away from the high pier a. The length of the diagonal support rod 44 can be adjusted, the inclination angle of the back brace stand 42 based on the back brace sliding cross frame 41 can be adjusted, and the inclination angle of the formwork body 5 can be flexibly adjusted, so as to more flexibly adapt to the construction requirements of different concrete surfaces.

[0072] Specifically, the backrest stand 42 comprises a plurality of assembly vertical rods 421 and a plurality of assembly horizontal rods 422 which are assembled perpendicularly; wherein the bottom ends of the plurality of assembly vertical rods 421 are respectively hingedly connected to one end of the backrest sliding horizontal frame 41 close to the high pier a, and the plurality of assembly horizontal rods 422 are all slidingly assembled on the plurality of assembly vertical rods 421; the backrest adjusting seat 46 has a screw end, the assembly vertical rod 421 is vertically provided with a plurality of positioning holes, and the screw end of the backrest adjusting seat 46 is screw-connected to one of the positioning holes of the assembly vertical rod 421 after extending through the assembly horizontal rod 422, so that the assembly horizontal rod 422 can be vertically positioned and fixed based on the assembly vertical rod 421.

[0073] The plurality of assembly horizontal rods 422 are respectively fixedly connected to a plurality of backrest fasteners 45 on the side end face away from the assembly vertical rods 421; the template body 5 is detachably fixedly connected to a plurality of groups of connecting claws 51 on the side end face facing the assembly horizontal rods 422, and a plurality of groups of the connecting claws 51 are respectively and correspondingly detachably connected to the plurality of backrest fasteners 45; so as to realize the detachable and same-direction setting of the template body 5 on the backrest stand 42, and then the template body 5 is combined as a construction template for concrete pouring; the top end of the template body 5 is further fixedly connected to a plurality of groups of lifting hooks 52, so as to realize the lifting and climbing construction of the template body 5 by the lifting hooks 52 cooperating with an external crane.

[0074] The cantilever platform 6 comprises a cantilever bottom plate 61 and a second platform stand 62; wherein the cantilever bottom plate 61 is transversely fixedly connected to the top end of the template body 5, and the second platform stand 62 is vertically fixedly connected to the side end of the cantilever bottom plate 61 away from the template body 5, so as to further improve the flexibility of construction operation by the cantilever platform 6, and improve the construction safety by the second platform stand 62.

[0075] Please refer to Figures 1 to 3 The spraying maintenance system 7 comprises a water tank 71, a water pump 72 and a plurality of groups of spraying heads 73; wherein the water tank 71 is connected to the plurality of groups of spraying heads 73 through water pipes, the water pump 72 corresponding to the water tank 71 is arranged in the water pipe, and the plurality of groups of spraying heads 73 are arranged around the lifting platform 2 on the periphery of the high pier a, so as to complete the concrete maintenance by the spraying maintenance system 7 arranged on the lifting platform 2.

[0076] The embodiment of the present application also provides a construction method of the cantilever template frame structure for the double-chamber hollow thin-wall high pier construction.

[0077] S1: stiff skeleton construction;

[0078] Specifically, the stiff skeleton is arranged inside the main reinforcement of the high pier a, the stiff skeleton is pre-buried 2.5 m and exposed 0.5 m during the construction of the pile cap of the high pier a, the inclined brace is arranged in each stiff skeleton, the stiff skeletons are welded into pieces before the installation of the stiff skeletons, the stiff skeletons are hoisted in sequence in pieces, and the horizontal angle steel is arranged at the position 80 cm above the top surface of the pile cap.

[0079] More specifically, first, the first stiff skeleton is installed and fixed by welding, the welding adopts the help strip welding, and the length of the help strip is not less than 49 cm; second, the remaining stiff skeletons are installed by the same method, welded into pieces, and hoisted in sequence in pieces.

[0080] S2: pier body reinforcement construction;

[0081] Specifically, the pile cap surface is used as the operation platform for the reinforcement binding during the construction of the first pier body.

[0082] After the vertical main reinforcement is transported to the site, 10-15 vertical main reinforcements are bound into a bundle, the upper middle part of each bundle of vertical main reinforcements is bound with a hoisting steel rope, the bottom is bound with a steel basket, the vertical main reinforcement is lifted to the top of the pier by the tower crane and temporarily placed on the operation platform, and two bundles of steel reinforcements are placed on each operation platform simultaneously and symmetrically; then the vertical main reinforcement is lifted to the joint by manpower, and the threaded joint is tightened by the torque wrench, and the vertical main reinforcement is connected and positioned; after the threaded joint of the two ends is tightened, the sleeve is tightened; after the vertical main reinforcement is connected and positioned, the horizontal stirrup arrangement interval is drawn on the vertical main reinforcement with a stone pen, the stirrup is bound according to the determined position, and the process is repeated until the position 30-40 cm above the top surface of the concrete to be poured, and finally the verticality of the steel reinforcement cage is checked by the total station and the deviation is corrected.

[0083] The steel reinforcement installation platform is welded by ∠100x100x10 / Q235 angle steel, the height is 4 m, and the platform is divided into two layers, one layer is arranged at the height of 1.5 m, and the second layer is arranged at the position of 3 m; the width of the platform is 80 cm, the platform is welded by ∠100x100x10 / Q235 angle steel, and φ16 steel mesh is laid on the platform.

[0084] S3: first pier body pouring construction;

[0085] Specifically, before the first segment construction, the formwork body 5 is assembled first, and after the assembly is completed, it is hoisted to the pile cap, the position of the formwork body 5 is adjusted according to the ink line on the top surface of the pile cap, and the formwork body 5 is fixed by using a pull rod; the first segment is poured at one time, the solid section concrete is poured first, and then the variable cross-section section concrete is poured after the vibration and compaction, 12 groups of installation embedded parts 13 are installed around the high pier a pier body at a position of 65 cm below the top end of the formwork before the mold closing, i.e. 3.95 m of the pier body; the installation embedded part 13 is composed of installation bolts 131, climbing cones 132, high-strength screw rods 133, the climbing cone 132 is fixed on the formwork body 5 by using the installation bolt 131, the high-strength screw rod 133 is tightened after the hole in the climbing cone 132 is greased, the concrete cannot flow into the thread of the climbing cone 132, the outside of the climbing cone 132 is smeared with a release agent to facilitate the recovery of the climbing cone 132, and the embedded part plate is screwed on the other end of the high-strength screw rod 133, the conical surface faces the formwork body 5 and is in the opposite direction of the climbing cone 132; if the installation embedded part 13 conflicts with the steel bars, the steel bars are relocated and then the mold is closed, and then the installation embedded part 13 is configured at the corresponding position before each concrete pouring.

[0086] S4: The triangular support frame 1 and the construction platform 3 are installed, the support platform 6 is installed, and the second segment pouring construction tool body is:

[0087] 1) Install the triangular support frame 1

[0088] Two wooden boards are placed on the horizontal ground; it is ensured that the two groups of climbing cones 132 of the installation embedded part 13 correspond to two axes that are absolutely parallel, and the angle between the axis of the climbing cone 132 and the connecting line of the wooden boards is 90°; the triangular support frame 1 is buckled on the installation embedded part 13; the first platform stand 12 is installed on the support frame body 11, and is connected by using a steel pipe buckle. The two groups of support frame bodies 11 are also connected by using a steel pipe buckle.

[0089] 2) Install the construction platform 3

[0090] The construction platform 3 is flat and firm, and is holed at the position where it conflicts with the triangular support frame 1 part to ensure the use of the frame body, and the distance between the two support frame bodies 11 to the middle is again corrected to be the distance between the climbing cone 132 to the middle during the first pouring.

[0091] 3) Hoist the triangular support frame 1 and the construction platform 3

[0092] After the first mold concrete reaches a strength of 15 MPa, the triangular support frame 1 and the construction platform 3 that are assembled are hoisted as a whole, are hung on the installation embedded part 13 that is pre-buried during the first pouring of the high pier a, and are inserted into a safety pin.

[0093] 4) Install the main back frame 4 and the support platform 6

[0094] First, four cushion beams b are laid under the template body 5, and then the main back brace 4 and the cantilever platform 6 are installed on the template body 5 in sequence, the main back brace 4 is fixedly connected with the template body 5 through installation of a back brace fastener 45, the cantilever platform 6 is connected with the template body 5 firmly by a steel pipe fastener, and a cable-stayed steel pipe is assembled.

[0095] 5) Hoisting the template body 5, the main back brace 4 and the cantilever platform 6

[0096] The assembled template body 5, the main back brace 4 and the cantilever platform 6 are hoisted as a whole by hoisting equipment, are hung stably on the installation pre-buried part 13 buried during the first pouring, and are inserted with a safety bolt; the angle is adjusted by using a diagonal brace, and the template is corrected; then the template is closed to pour the second segment of concrete.

[0097] S5: Template frame climbing, third segment of concrete pouring

[0098] Specifically, after the second segment of concrete reaches a strength of 15 MPa, the template body 5 is removed stably and placed on a flat ground by sliding the main back brace 4 backward, then the safety bolt at the climbing cone 132 is pulled out, the triangular support frame 1 is hoisted to the second layer of pre-buried climbing cone 132, i.e. the initial installation of the template body 5 above the climbing cone 132, and the safety bolt is inserted; after the triangular support frame 1 is installed, the third mold steel bar is bound, then the template is hoisted and installed to the backward platform, the template is closed to pour the third segment of concrete, and the step S5 is repeated until the high pier a column is capped.

[0099] S6: Capping segment construction

[0100] Specifically, the solid segment of the pier body and the pier top is 2 m high, and since there is no manhole, if the bracket method is used for pouring, the internal bracket cannot be removed, and the construction materials are wasted greatly, therefore, the way of laying a concrete precast slab on the top of the last segment is used to close the inner box first, and then the concrete is poured.

[0101] Before the capping segment construction, the last segment is a 2.5 m inner box with a chamfered segment, when the concrete of this segment is poured, a 45 cm long φ25 steel bar is pre-buried every 30 cm at 20 cm below the top surface of the concrete, of which 30 cm is pre-buried and 15 cm is exposed, as a precast cover plate installation support.

[0102] Although the present application has been described in detail by the general description and specific embodiments above, some modifications or improvements can be made on the basis of the present application, which is obvious to those skilled in the art. Therefore, these modifications or improvements made on the basis of not deviating from the spirit of the present application are within the scope of the present application.

Claims

1. A construction method for a cantilever formwork framework for the construction of a double-chambered hollow thin-walled high pier, characterized in that, Specifically comprising the following steps: S1: construction of the rigid skeleton; Specifically, the rigid skeleton is arranged inside the main reinforcement of the high pier, and the rigid skeleton is pre-buried 2.5 m and exposed 0.5 m during the construction of the high pier pile cap, and each section of the rigid skeleton is provided with a diagonal brace, before the installation of the rigid skeleton, each section of the rigid skeleton is welded into a piece, and the pieces are hoisted in sequence, and the horizontal angle steel is arranged at 80 cm above the top surface of the pile cap; More specifically, first, the first section of the rigid skeleton is installed and fixed by welding, and the welding adopts a help strip welding, and the length of the help strip is not less than 49 cm; second, the remaining sections of the rigid skeleton are installed by the same method, welded into a piece, and hoisted in sequence; S2: construction of the pier body reinforcement; Specifically, during the construction of the first section of the pier body, the pile cap surface is used as an operation platform for reinforcement binding; After the vertical main reinforcement is transported to the site, 10-15 reinforcements are bound into a bundle, the upper part of each bundle of vertical main reinforcement is bound with a hoisting steel rope, and the bottom is bound with a steel basket, the vertical main reinforcement is lifted to the top of the pier by a tower crane, and is temporarily placed on the operation platform, two bundles of reinforcement are placed on each operation platform at the same time, and then the reinforcement is lifted to the joint by hand, the threaded joint is tightened by a torque wrench, and the reinforcement can be used after the threads of the threaded joints at both ends are tightened; after the vertical main reinforcement is connected and positioned, the arrangement interval of the horizontal stirrup is drawn on the vertical main reinforcement with a stone pen, the stirrup is bound according to the determined position, and the process is repeated until the position 30-40 cm above the top surface of the concrete to be poured is reached, and finally the verticality of the reinforcement skeleton is checked by a total station and is corrected; The reinforcement installation platform is welded by ∠100*100*10 / Q235 angle steel, the height is 4 m, and is divided into two layers, a layer of platform is arranged at a height of 1.5 m, and a second layer of platform is arranged at a position of 3 m; the width of the platform is 80 cm, the platform is welded by ∠100*100*10 / Q235 angle steel, and φ16 steel mesh is laid on the platform; S3: first section of the pier body pouring construction; Specifically, before the construction of the first section, the formwork body is assembled, hoisted to the pile cap after the assembly is completed, the position of the formwork body is adjusted according to the ink line on the top surface of the pile cap, and the formwork body is fixed by a pull rod; the first section is poured at one time, the concrete of the solid section is poured first, the concrete of the variable cross-section section is poured after the solid section is vibrated and compacted, and the embedded part is installed around the high pier body at a position 65 cm below the top end of the formwork, i.e. a position 3.95 m from the high pier body before the formwork is closed; the embedded part is composed of installation bolts, climbing cones and high-strength screws, the climbing cone is fixed on the formwork body by the installation bolt, the climbing cone hole is greased and the high-strength screw is tightened, so that the concrete cannot flow into the climbing cone thread, the climbing cone is coated with a release agent on the outside to facilitate the recovery of the climbing cone, and the embedded part plate is screwed on the other end of the high-strength screw, the conical surface faces the formwork body and is in the opposite direction of the climbing cone; if the embedded part conflicts with the reinforcement, the reinforcement is moved and processed before the formwork is closed, and the embedded part is configured at the corresponding position before each concrete pouring; S4: installation of the triangular support frame and the construction platform, installation of the cantilever platform and pouring construction of the second section; Specifically, 1) installation of the triangular support frame; Prepare two pieces of wood board placed on the horizontal ground; Ensure that the two groups of climbing cone corresponding to the two axes are absolutely parallel, and the angle between the climbing cone axis and the wood board is 90°; The triangular support frame is buckled on the installation embedded part; Install the first platform stand on the support frame body, and connect it with steel pipe buckles; 2) Install the construction platform; The construction platform is flat and firm, and is installed with a hole in the position of conflict with the triangular support frame component to ensure the use of the frame body and correct whether the middle distance between the two support frame bodies is the same as the middle distance between the climbing cones when pouring the first time; 3) Hoist the triangular support frame and the construction platform; After the first mold concrete reaches a strength of 15MPa, the assembled triangular support frame and construction platform are hoisted as a whole, hung on the installation embedded part pre-buried during the first high pier pouring, and the safety pin is inserted; 4) Install the main back frame and the cantilever platform; First, pad four cushion beams under the formwork body, then install the main back frame and the cantilever platform on the formwork body in turn, the main back frame is connected with the formwork body through the installation back frame buckle, the cantilever platform is connected with the formwork body firmly with steel pipe buckles, and the inclined steel pipe is assembled; 5) Hoist the formwork body, main back frame and cantilever platform; The assembled formwork body, main back frame and cantilever platform are hoisted as a whole by the hoisting equipment, stably hung on the installation embedded part buried during the first pouring, and the safety pin is inserted; Adjust the angle with the inclined support, correct the formwork, and then close the mold for the second segment concrete pouring; S5: Formwork frame climbing, third segment concrete pouring; Specifically: after the second segment concrete reaches a strength of 15MPa, the formwork body is removed stably on the flat ground by sliding the main back frame, then the safety pin at the climbing cone is pulled out, the triangular support frame is hoisted to the second layer pre-buried climbing cone, i.e. the initial installation of the formwork body above the climbing cone, and the safety pin is inserted; After the triangular support frame is installed, the third mold reinforcement is bound, then the formwork is hoisted and installed on the moved platform, the third mold concrete is poured, and the step S5 is repeated until the high pier column is capped; S6: Capping segment construction; Specifically: the solid segment of the pier top is 2m high, and there is no manhole, so if the support method is used for pouring, the internal support cannot be removed, and the construction material is wasted, so the method of laying a concrete precast slab on the top of the last segment is used to close the inner box first, and then pour the concrete; Before the capping segment construction, the last segment is a 2.5m inner box with a chamfered top, and during the pouring of this segment, a 45cm long φ25 steel bar is pre-buried every 30cm 20cm below the top surface of the concrete, of which 30cm is pre-buried and 15cm is exposed, as a precast cover plate installation support.

2. A cantilever formwork framework for the construction of a double-cell hollow thin-walled high-pier, which performs the construction method as claimed in claim 1, characterized in that, It includes: A triangular support frame for separable fixed assembly on the high pier; A hoisting platform fixedly assembled at the bottom end of the triangular support frame; A construction platform fixedly assembled at the top end of the triangular support frame; The main back support frame includes a back support sliding cross frame, a back support upright frame, and diagonal bracing rods; the back support sliding cross frame is slidably mounted on the top surface of the construction platform; the bottom end of the back support upright frame is hinged to the end of the back support sliding cross frame near the high pier; the diagonal bracing rods are fixed telescopic rods, and one end of the diagonal bracing rod along its telescopic direction is rotatably mounted to the side of the back support upright frame facing away from the high pier, and the other end of the diagonal bracing rod along its telescopic direction is rotatably mounted to the end of the back support sliding cross frame away from the high pier; The template body is detachably and fixedly connected to the back support frame.

3. The cantilever formwork structure for the construction of double-chamber hollow thin-walled high piers according to claim 2, characterized in that, The triangular support frame includes a support frame body, pre-embedded parts, and embedded part supports; The main body of the support frame is a triangular support frame, and the embedded support is fixedly assembled on the vertical straight side of the triangular support frame. The embedded support and the installation pre-embedded part are detachably fastened and fixedly assembled. The main body of the support frame is fixed to the high pier by pre-embedding the pre-embedded part.

4. The cantilever formwork structure for the construction of double-chamber hollow thin-walled high piers according to claim 3, characterized in that, The horizontal straight side of the support frame body corresponds to the side of the construction platform away from the high pier, and a first platform upright is also fixedly assembled thereon.

5. The cantilever formwork structure for the construction of double-chamber hollow thin-walled high piers according to claim 2, characterized in that, The hoisting platform is fixedly assembled to the bottom end of the vertical straight side of the triangular support frame body, and the hoisting platform is set close to the high pier; The construction platform is fixedly assembled to the horizontal straight side of the main body of the support frame.

6. The cantilever formwork structure for the construction of double-chamber hollow thin-walled high piers according to claim 2, characterized in that, The main back beam frame also includes a back beam adjustment seat; The back support frame includes several vertical assembly rods and several horizontal assembly rods that are perpendicularly assembled; the bottom ends of the several vertical assembly rods are respectively hinged to the end of the back support sliding horizontal frame near the high pier, and the several horizontal assembly rods are all slidably assembled to the several vertical assembly rods. The back rib adjustment seat has a screw end, and the assembly vertical rod has several positioning holes. The screw end of the back rib adjustment seat extends through the assembly horizontal rod and is screwed into one of the positioning holes of the assembly vertical rod.

7. The cantilever formwork structure for the construction of double-chamber hollow thin-walled high piers according to claim 6, characterized in that, Several of the aforementioned horizontal bars are respectively fixedly assembled with several back-rib fasteners on the end face of the side facing away from the aforementioned vertical bars; The template body has several sets of connecting claws that can be detachably fixedly assembled on one end face facing the assembly crossbar. The several sets of connecting claws are detachably fastened and fixedly assembled with several back rib fasteners in a one-to-one correspondence.

8. The cantilever formwork framework for construction of double-cell hollow thin-walled high piers according to claim 2, characterized in that, Also includes: The cantilever platform includes the base plate and the second platform frame; The eaves bottom plate is transversely and fixedly assembled to the top end of the formwork body, and the second platform stand is vertically and fixedly assembled to the side end of the eaves bottom plate away from the formwork body.

9. The cantilever formwork framework for construction of double-cell hollow thin-walled high piers according to claim 2, characterized in that, Further comprising: The spraying maintenance system comprises a water storage pool, a water pump and a spraying head. The spraying head is provided with a plurality of groups, the water storage pool is connected to the plurality of groups of spraying heads through water pipes, the water pipes are provided with the water pump corresponding to the water storage pool, and the plurality of groups of spraying heads are arranged around the hoisting platform on the outer side of the high pier.

10. The cantilever formwork framework for the construction of a double-chamber hollow thin-walled high pier according to claim 2, characterized in that, The top end of the formwork body is further fixedly provided with a plurality of groups of lifting hooks.

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