CN114892528A - Double-layer formwork construction method for uniform-section thin-wall hollow pier - Google Patents
Double-layer formwork construction method for uniform-section thin-wall hollow pier Download PDFInfo
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- CN114892528A CN114892528A CN202210560751.3A CN202210560751A CN114892528A CN 114892528 A CN114892528 A CN 114892528A CN 202210560751 A CN202210560751 A CN 202210560751A CN 114892528 A CN114892528 A CN 114892528A
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- 238000010276 construction Methods 0.000 title claims abstract description 36
- 238000009415 formwork Methods 0.000 title claims description 26
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 75
- 239000010959 steel Substances 0.000 claims abstract description 75
- 238000000034 method Methods 0.000 claims abstract description 10
- 230000002093 peripheral effect Effects 0.000 claims description 56
- -1 polytetrafluoroethylene Polymers 0.000 claims description 52
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 52
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 52
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 12
- 238000005192 partition Methods 0.000 claims description 9
- 239000007787 solid Substances 0.000 claims description 6
- 230000008569 process Effects 0.000 claims description 5
- 230000009194 climbing Effects 0.000 claims description 3
- 238000007796 conventional method Methods 0.000 claims description 3
- 230000000630 rising effect Effects 0.000 claims description 3
- 125000004122 cyclic group Chemical group 0.000 claims 1
- 230000007547 defect Effects 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 abstract description 2
- BFKJFAAPBSQJPD-UHFFFAOYSA-N tetrafluoroethene Chemical group FC(F)=C(F)F BFKJFAAPBSQJPD-UHFFFAOYSA-N 0.000 abstract 1
- 229910001172 neodymium magnet Inorganic materials 0.000 description 9
- 230000008901 benefit Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 230000001360 synchronised effect Effects 0.000 description 3
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000001681 protective effect Effects 0.000 description 2
- 230000007306 turnover Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 239000011083 cement mortar Substances 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000004043 dyeing Methods 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 238000004064 recycling Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/02—Piers; Abutments ; Protecting same against drifting ice
Abstract
The invention relates to a construction method of a high pier stud double-layer template, and belongs to the field of bridge pier stud construction. The method is used for the construction of high pier columns, in particular to the equal-section thin-wall hollow pier columns. The invention is composed of a template enclosure truss structure, a steel template, a lifting frame, a hydraulic jack lifting system and a tetrafluoroethylene panel, realizes that the outer template of the high pier stud is lifted without contacting with concrete, avoids sliding friction on the concrete surface, solves the problem of appearance defect of the concrete caused by the friction of the surface of the concrete which is not completely solidified by the template in the construction technology of the sliding template, and can realize the high-efficiency construction of the thin-wall hollow pier of the bridge.
Description
Technical Field
The invention belongs to the field of bridge pier stud construction, and particularly relates to constant-section thin-wall hollow pier construction.
Background
The large-scale construction of traffic engineering, especially mountain area expressway bridge tunnel than is higher and higher, high pier stud is huge in the highway construction of the noble plateau of cloud. With the development of thin-wall hollow piers of more than 40m from expressway to deep-mountain canyon, the method is very common. The construction template that present high pier stud used mainly has mould, slip form and creeping formwork, and each mould of mould construction that turns over all will experience dismantling and installing of template, and is the artifical dismantlement of tower crane cooperation and installation, and high altitude construction safety risk is great, and frequent dismouting template also leads to the efficiency of construction to be lower. The creeping formwork construction is high in mechanization degree, but the formwork is lifted and closed again after the formwork leaves the concrete surface after the concrete is fully solidified, the creeping formwork equipment is high in manufacturing cost and low in construction efficiency due to the influence of the age of the concrete, and the average speed of the creeping formwork and the creeping formwork in the construction of the thin-wall hollow pier is hardly more than 1m per day. The construction of the sliding template is directly performed on the surface of the insufficiently solidified concrete through the template, the construction is not influenced by age and is very efficient, but the template directly rubs on the surface of the insufficiently solidified concrete to cause poor appearance quality or quality defects of the pier column. The pier column construction process which is high in efficiency and can ensure quality safety becomes a new market demand. A brand-new high pier stud construction technology is developed based on the advantages of the existing turnover formwork, creeping formwork and sliding formwork, and has considerable economic and social values.
Disclosure of Invention
The invention aims to provide a high-efficiency construction method of a constant-section thin-wall hollow pier, which can realize high-efficiency construction of the thin-wall hollow pier and ensure the construction quality of a pier column including the appearance quality of concrete.
The invention discloses a construction method of a double-layer template system of a constant-section thin-wall hollow pier, which is characterized in that an outer surrounding template system 12 and an inner surrounding template system 16 are lifted by a wedge block jack, then a polytetrafluoroethylene module at the lower part is continuously exposed from the lower part, and the inner surrounding template system is manually disassembled and then installed to the upper part to realize the recycling of an inner template, and the construction method specifically comprises the following steps:
step 1, a thin-wall hollow pier generally has a 2-2.5 m solid section on a bearing platform, the mounting position of a peripheral ring template is positioned by measuring paying-off, a peripheral ring template system and an upper operating platform are mounted, polytetrafluoroethylene flat modules 22 are assembled and adsorbed on the surface of the peripheral ring steel template, a support rod is inserted into a wedge-type jack 4, concrete is poured inside the polytetrafluoroethylene module after pier stud reinforcing steel bars are mounted, oil can be synchronously supplied to the wedge-type jack after final setting to lift the peripheral ring template system, a polytetrafluoroethylene inner module is continuously mounted on the upper portion of the peripheral ring template, reinforcing steel bars and concrete are continuously mounted in the pier stud, the embedded head bolt is manually unscrewed and the polytetrafluoroethylene module is removed after the lower polytetrafluoroethylene flat module 22 is completely separated from the peripheral ring template, and the peripheral ring lower hanging operating platform is mounted when the rising height of the peripheral ring template reaches 2 m;
step 3, directly sliding the inner cavity template system for 2m along a climbing rod after the inner enclosure steel template system reaches the position of the transverse partition plate, and pouring the transverse partition plate by adopting a conventional method, wherein after the inner cavity is subjected to section lagging through the transverse partition plate, the hollow section is poured by continuously adopting lifting of the enclosure mould and disassembly and assembly circulation of the polytetrafluoroethylene module; the peripheral ring template is lifted and circulated to the pier top all the time;
and 4, after the inner cavity template system finishes pouring of the last cavity pier wall, the lifting enclosure steel mold system is supported by the section steel crosspiece, and then the inner cavity steel mold system is disassembled and then each part is transported to the ground by the tower crane. The steel mould system of the peripheral ring is lifted to the top of the pier and then continues to climb the peripheral ring until the peripheral ring is separated from the top of the pier to remove all polytetrafluoroethylene modules, the traction hoisting system of the top of the pier is adopted to fasten the whole set of outer steel mould system and then remove the hoisting frame and cut the supporting rods exceeding the top of the pier, the whole set of outer mould system is lowered to the ground through the pier-jacking hoisting system and then removed, and polytetrafluoroethylene plates with the thickness of 2mm are padded on the periphery of the surrounding mould in the lowering process.
The periphery of the constant-section thin-wall hollow pier adopts a truss enclosure, a lifting frame, a hydraulic jack, an oil pump and the like to form a support framework of an outer formwork and has lifting power, the integral lifting of the enclosure is realized through the lifting frame embedded in the pier stud, the outer enclosure steel formwork is solidified on the outer enclosure truss, and an outer enclosure steel formwork system is integrally lifted on the lifting frame through a building block type jack; the inner cavity of the thin-wall hollow pier forms an inner cavity steel die through a truss enclosure, a thin steel plate, a lifting frame, a hydraulic jack, an oil pump and the like, the outer steel die and the inner cavity steel die form a stress system for pouring the pier wall, one layer of inner die assembled by polytetrafluoroethylene modular plates is installed on the surface of the outer steel die and the inner cavity steel film, the inner die is arranged between concrete and the steel die, the inner die is fixed relative to the concrete, and the inner die is detached according to blocks after being exposed from a lower opening of the steel die after the steel die is lifted and is installed again at the upper opening so as to realize circulation of the inner die.
The inner template is formed by assembling a sizing modularized polytetrafluoroethylene template on the surface of a steel mould and is used for isolating concrete from the steel mould, and neodymium magnets are embedded in the polytetrafluoroethylene template and can be adsorbed on the surface of the steel mould. The sliding friction coefficient with the steel form is minimum in vertical, and the toper bolt hole is reserved to the lower part in the polytetrafluoroethylene module board, and the countersunk bolt passes the bolt hole and links to each other with the nut of concrete side, and the nut just buries in the concrete behind the concreting to be fixed in the concrete surface with polytetrafluoroethylene module board, the steel form promotes the in-process and dismantles and install the top realization circulation in the steel form through the polytetrafluoroethylene module board that constantly exposes the end opening.
The modular polytetrafluoroethylene plate is 1.5-2 m in length, 40cm in height and 6-8 mm in thickness, neodymium magnets are embedded in the polytetrafluoroethylene module plate along the periphery of the plate thickness through uniform square-chisel holes, vertical occlusion is achieved by arranging concave-convex rabbets on the upper edge and the lower edge of the inner template, and the concave-convex rabbets can be horizontally detached from each other. In order to realize that the inner template can vertically slide relative to the outer steel mould and is always fixed on the concrete surface, wedge-shaped round holes are reserved at the position of the polytetrafluoroethylene module plate 100mm away from the lower edge, the wedge-shaped round holes are horizontally arranged at a distance of 50cm-70cm, and embedded countersunk bolts are M6 or M8.
An operation platform, a hydraulic system and a control system are integrated on the peripheral ring steel template system. The outer steel template system is characterized in that an enclosure is formed by steel trusses enclosed on four sides, purlins and smooth stainless steel plates are mounted inside the enclosure, and the thickness of the steel plates is 4-5 mm. 8-12 inverted L-shaped steel lifting frames are uniformly arranged on the enclosure. The hoisting frame is formed by welding HN steel, channel steel and steel plates, wedge-type jacks are mounted at the ends of beam ends of the channel steel, seamless steel pipes with the diameter of 48 x 3.5 penetrate through the middle of the wedge-type jacks, the steel pipes are directly embedded in pier column concrete, the supporting steel pipes can sleeve pier column steel bars and cement mortar is used for filling the insides of the steel pipes in the construction process. All jacks are connected to the synchronous oil cylinder through high-pressure oil pipes, synchronous oil supply can be achieved through all the jacks, synchronous lifting is achieved, independent oil supply of a single jack is achieved through an additional pipeline, in order to achieve leveling in the process, and large prisms are arranged at four corners of the enclosure truss and used for monitoring perpendicularity.
Operation platform directly sets up in the upper and lower side of enclosing, and the top is through setting up the bed board, peripheral installation safety protection railing and the protection network on the enclosing, and the railing bottom sets up the baseboard, forms operation platform. The hydraulic press electric system is reasonably distributed in the enclosure truss. The lower operating platform is formed by arranging a suspender on the enclosure to hang a lower cross rod and a floor, installing a protective guard and a protective net. The control system mainly comprises a plane position and a verticality control device, wherein vertical rods are arranged at four corners of the enclosure, the enclosure is fixed at the same height through mutually communicated transparent graduated tubes, a transparent clean water body is injected with dyeing in the communicating tube, whether the enclosure is kept horizontal or not is judged through the liquid level of the water body in the communicating tube, and the enclosure is leveled through an adjusting jack if deviation occurs. Two diagonal angles of enclosure set up the wire rope hammer ball, hammer ball weight 20kG, and the wire rope is rolled up and is installed on the enclosure, and the wire rope is constantly given off to the in-process that rises, guarantees the fixed ground clearance of hammer ball, measures the ground clearance of enclosure constantly through the wire rope length of giving off simultaneously.
The steel die in the inner cavity of the thin-wall hollow pier is similar to the outer steel die in structure, but the hammer ball is not arranged on the inner steel die system.
The construction method of the equal-section thin-wall hollow pier double-layer system mainly realizes the separation of the vertical lifting and horizontal supporting functions of the template system, and realizes the continuous construction of pier wall concrete by using the two layers of templates. Contrast turnover formwork and creeping formwork have and do not receive the influence of concrete age, and the advantage that whole construction speed is fast, and the construction of contrast sliding template has then fundamentally guaranteed concrete appearance quality, other advantages of this set of system: the manufacturing cost is low, the mechanization degree is high, the mechanism is stable, the operation is simple and convenient, and the method can be widely applied to the equal-section high pier stud.
Drawings
FIG. 1 is a schematic diagram of a peripheral ring template system;
FIG. 2 is a schematic view of the upper operating platform of the peripheral ring template;
FIG. 3 is a schematic view of the lower operating platform of the peripheral ring template;
FIG. 4 is a schematic view of the peripheral ring template system assembly;
FIG. 5 is a schematic view of an inner ring template system;
FIG. 6 is a schematic view of the upper and lower operation platforms of the inner enclosure template;
FIG. 7 is a schematic view of the assembly of the inner ring template;
FIG. 8 is a schematic structural view of a flat module;
FIG. 9 is a schematic structural diagram of a corner module;
FIG. 10 is a schematic diagram of the assembly of a straight module and a corner module on a thin-walled hollow pier with equal cross section;
fig. 11 is a general installation schematic.
In the figure: 1-peripheral ring truss, 2-inverted L-shaped lifting frame, 3-peripheral ring steel template, 4-wedge block type jack, 5-embedded support rod, 6-upper operation platform laying plate, 7-operation platform guardrail, 8-reserved channel, 9-lower operation platform laying plate, 10-lower operation platform suspender, 11-lower platform guardrail, 12-peripheral ring template system, 13-inner ring truss, 14-inner ring steel template, 15-inner cavity platform connecting stair, 16-inner ring template system, 17-module concave rabbet, 18-module convex rabbet, 19-module vertical square hole, 20-module horizontal square hole, 21-module reserved conical screw hole, 22-straight module and 23-corner module.
Detailed Description
The invention is further described with reference to the following drawings and detailed description.
Example 1
Referring to fig. 1-11, a double-layer template system of a thin-wall hollow pier with uniform cross section is composed of three major parts, namely an outer surrounding ring template system 12, an inner surrounding ring template system 1) and a polytetrafluoroethylene inner module system, and the three major parts are as follows:
the peripheral ring template system is characterized in that a peripheral ring truss 1 is formed by trusses which are orthogonally enclosed on four sides, inverted L-shaped lifting frames 2 are uniformly distributed on the peripheral ring truss 1, and a peripheral ring steel template 3 is arranged on the inner side of the peripheral ring truss 1;
the inner enclosure truss 13 of the inner enclosure template system 16 and the inner enclosure steel templates 14 arranged outside the inner enclosure truss 13 are formed, and the inverted L-shaped lifting frames 2 are uniformly distributed and arranged on the inner enclosure truss;
a wedge block type jack 4 is arranged on the cross beam of the inverted L-shaped lifting frame 2, and a support rod 5 is embedded in the vertical direction;
the peripheral ring template system is also provided with an upper operating platform and a lower operating platform, the periphery of the operating platform is provided with a guardrail 7, the lower operating platform is provided with a platform suspender 10, and the operating platform is also provided with a channel 8;
an inner operation platform is arranged in the inner enclosure template system and is divided into an upper part and a lower part which are communicated through a connecting stair 15;
the polytetrafluoroethylene module is divided into a straight module 22 and a corner module 23, wherein the straight module 22 and the corner module 23 are mutually buckled, hung, assembled and installed in the inner cavity of the thin-wall hollow pier, and the other one is installed outside the thin-wall hollow pier and is only formed by assembling the straight module 22;
the straight module 22 and the corner module 23 are also provided with countersunk bolt tapered holes 21, vertical square holes 19 of the modules are uniformly arranged at the centers of the upper and lower edges of the straight module and the corner module, two horizontal square holes 20 of the modules are respectively arranged at the left and right sides, and square neodymium magnets are embedded in the square holes.
The diameter of the vertical square hole and the horizontal square hole of the module is 10mm x 2mm, the depth of the vertical square hole and the horizontal square hole is 60mm, the square neodymium magnet is 10mm x 2mm x 50mm, the directions of the magnetic poles of the neodymium magnets embedded in all the square holes at the upper edge and the lower edge of the module are consistent, and the directions of the magnetic poles of the neodymium magnets embedded at the left edge and the right edge are also consistent.
Example 2
The thin-wall hollow pier double-layer template system is shown in figures 1-11 and mainly comprises three major parts, namely an outer peripheral ring template system 12, an inner peripheral ring template system 16 and polytetrafluoroethylene inner modules 22 and 23. The peripheral ring template system 12 comprises a peripheral ring steel truss 1, an inverted L-shaped lifting frame 2, a peripheral ring steel template 3, a wedge-type jack 4 and an embedded supporting rod 5 in the figure I; in the second figure, an operation platform paving plate 6, an operation platform guardrail 7 and a reserved channel 8 are arranged on the outer enclosure; in the third figure, the lower operation platform of the outer enclosure consists of a paving plate 9, a lower operation platform suspender 10 and a lower platform guardrail 11. The inner cavity template system consists of an inverted L-shaped lifting frame 2 in a fifth drawing, a wedge-shaped jack 4, an embedded support rod 5, an inner cavity enclosure steel template 13, an inner cavity enclosure steel template 14, platform paving plates 6 in an upper inner operation platform drawing and a lower inner operation platform drawing, an operation platform guardrail 7, a lower operation platform paving plate 9, a lower operation platform suspender 10, a lower platform guardrail 11 and an inner cavity platform connecting stair 15. The polytetrafluoroethylene inner mold system is shown in the overall assembly schematic view, the polytetrafluoroethylene inner mold system is formed by assembling polytetrafluoroethylene flat modules 22 and polytetrafluoroethylene corner modules 23 through concave-convex rabbets, the polytetrafluoroethylene flat modules 22 are shown in the figure, the thickness of a polytetrafluoroethylene plate is 8mm, the upper edge of each module concave rabbet 17 is provided with a module concave rabbet 17, the module concave rabbet can be vertically locked with other module convex rabbets 18 and can be freely installed and detached in the horizontal direction, in addition, a countersunk bolt conical hole is reserved in each module, a countersunk bolt M6 or M8 is adopted, the length is 60mm-80mm, nuts in embedded concrete are matched with corresponding lengths, and anchor plates with the diameter of 30mm are installed at the other ends of the anchor plates. The vertical square holes 19 of the module are uniformly arranged at the center of the thickness of the upper edge and the lower edge of the module, the depth of the square hole is 70mm from 10mm to 3mm, and the sizes of the horizontal square holes 20 of the two modules are consistent with the sizes of the square holes 19. The square holes are embedded with 10mm 3mm 60mm square neodymium magnets, the directions of the magnetic poles of the neodymium magnets embedded in all the square holes at the upper and lower edges of the module are consistent, and the directions of the magnetic poles of the neodymium magnets embedded at the left and right edges are also consistent.
The thin-wall hollow pier is generally provided with a 2-2.5 m solid section on a bearing platform, the mounting position of a peripheral ring template is positioned by measuring and paying off, a peripheral ring template system and an upper operating platform are mounted, a polytetrafluoroethylene flat module 22 is assembled and adsorbed on the surface of a steel template, a support rod is inserted into a block type jack 4, concrete is poured inside polytetrafluoroethylene after pier stud reinforcing steel bars are mounted, oil can be synchronously supplied to a wedge block jack after final setting to lift the peripheral ring template system, a polytetrafluoroethylene inner module is continuously mounted on the upper portion of a peripheral ring template, reinforcing steel bars and concrete are continuously mounted in a pier stud, a countersunk bolt is manually screwed down and the polytetrafluoroethylene module is detached after the lower polytetrafluoroethylene flat module 22 is completely separated from the peripheral ring template, and the peripheral ring lower hanging operating platform is mounted when the rising height of the peripheral ring template reaches 2 m. When the outer surrounding ring template system is lifted to the top of the solid section, the position of the inner surrounding ring template system is located through measurement, the inner surrounding ring template system and the upper operating platform are installed, a polytetrafluoroethylene straight module 22 is installed inside the steel template, and a polytetrafluoroethylene corner module 23 is assembled into an inner template. And then, installing reinforcing steel bars and pouring concrete between the polytetrafluoroethylene inner moulds, and then, installing the reinforcing steel bars and then lifting the steel formwork system of the enclosure, wherein the polytetrafluoroethylene inner modules of the outer part and the inner cavity are continuously dismounted and installed above the steel formwork system after being exposed at the lower part of the steel formwork system of the enclosure, so that the pier wall construction is continuously and circularly upwards realized. After the inner steel mold reaches the position of the transverse partition plate, the inner cavity template system is directly lifted for 2m along the climbing rods and then the transverse partition plate is poured by adopting a conventional method, and after the inner cavity passes through the section of the transverse partition plate, the hollow section is continuously poured by adopting the lifting of the surrounding ring mold and the dismounting and mounting circulation of the polytetrafluoroethylene module. The outer form is lifted all the way to the pier top. After the inner cavity template system finishes pouring of the last cavity pier wall, the lifting enclosure steel mold system is supported by the section steel crosspiece, and then the inner cavity steel mold system is detached and then is transported to the ground by the tower crane. After the peripheral ring template system is lifted to the pier top, the peripheral ring template system is fixed by using a rope in an auxiliary mode, and then all the parts are transported to the ground after being detached by adopting the cooperation of a tower crane.
Claims (1)
1. The utility model provides a construction method of hollow mound double-deck template system of uniform cross section thin wall, its characterized in that outer surrounding template system (12), interior surrounding template system (16) are through the polytetrafluoroethylene module of wedge jack promotion back lower part constantly expose the back from the lower part, install the cyclic utilization that realizes the inside template to the top after artifical dismantlement, specifically as follows:
step 1, a thin-wall hollow pier generally has a 2-2.5 m solid section on a bearing platform, the mounting position of a peripheral ring template is positioned by measuring paying-off, a peripheral ring template system and an upper operating platform are mounted, polytetrafluoroethylene flat modules 22 are assembled and adsorbed on the surface of the peripheral ring steel template, a support rod is inserted into a wedge-type jack 4, concrete is poured inside the polytetrafluoroethylene module after pier stud reinforcing steel bars are mounted, oil can be synchronously supplied to the wedge-type jack after final setting to lift the peripheral ring template system, a polytetrafluoroethylene inner module is continuously mounted on the upper portion of the peripheral ring template, reinforcing steel bars and concrete are continuously mounted in the pier stud, the embedded head bolt is manually unscrewed and the polytetrafluoroethylene module is removed after the lower polytetrafluoroethylene flat module 22 is completely separated from the peripheral ring template, and the peripheral ring lower hanging operating platform is mounted when the rising height of the peripheral ring template reaches 2 m;
step 2, positioning the position of an inner peripheral ring mould by measuring when the peripheral ring template system is lifted to the top of the solid section, installing the inner peripheral ring template system and an upper operating platform, and subsequently installing a polytetrafluoroethylene straight module (22) and a corner module (23) in the steel template; then, installing reinforcing steel bars between the polytetrafluoroethylene inner moulds and pouring concrete, and then installing the reinforcing steel bars and then lifting the steel formwork system of the enclosure, wherein the polytetrafluoroethylene inner modules of the outer part and the inner cavity are continuously dismounted and installed above the steel formwork system after being exposed at the lower part of the steel formwork system of the enclosure, so that the pier wall construction is continuously and circularly upwards realized;
step 3, directly sliding the inner cavity template system for 2m along a climbing rod after the inner enclosure steel template system reaches the position of the transverse partition plate, and pouring the transverse partition plate by adopting a conventional method, wherein after the inner cavity is subjected to section lagging through the transverse partition plate, the hollow section is poured by continuously adopting lifting of the enclosure mould and disassembly and assembly circulation of the polytetrafluoroethylene module; the peripheral ring template is lifted and circulated to the pier top all the time;
step 4, after the inner cavity template system completes the pouring of the final cavity pier wall, the lifting enclosure steel mold system is supported by the section steel crosspiece, and then the inner cavity steel mold system is disassembled and then each part is transported to the ground by a tower crane;
the steel mould system of the peripheral ring is lifted to the top of the pier and then continues to climb the peripheral ring until the peripheral ring is separated from the top of the pier to remove all polytetrafluoroethylene modules, the traction hoisting system of the top of the pier is adopted to fasten the whole set of outer steel mould system and then remove the hoisting frame and cut the supporting rods exceeding the top of the pier, the whole set of outer mould system is lowered to the ground through the pier-jacking hoisting system and then removed, and polytetrafluoroethylene plates with the thickness of 2mm are padded on the periphery of the surrounding mould in the process of the lower side.
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