CN116479763A - Special-shaped main tower construction section concrete winter maintenance method - Google Patents
Special-shaped main tower construction section concrete winter maintenance method Download PDFInfo
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- CN116479763A CN116479763A CN202310218980.1A CN202310218980A CN116479763A CN 116479763 A CN116479763 A CN 116479763A CN 202310218980 A CN202310218980 A CN 202310218980A CN 116479763 A CN116479763 A CN 116479763A
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- 239000004567 concrete Substances 0.000 title claims abstract description 154
- 238000010276 construction Methods 0.000 title claims abstract description 119
- 238000000034 method Methods 0.000 title claims abstract description 57
- 238000012423 maintenance Methods 0.000 title claims description 19
- 238000009413 insulation Methods 0.000 claims abstract description 87
- 230000009194 climbing Effects 0.000 claims abstract description 84
- 238000009415 formwork Methods 0.000 claims abstract description 56
- 238000004321 preservation Methods 0.000 claims abstract description 34
- 229910000831 Steel Inorganic materials 0.000 claims description 42
- 239000010959 steel Substances 0.000 claims description 42
- 239000012212 insulator Substances 0.000 claims description 22
- YKTSYUJCYHOUJP-UHFFFAOYSA-N [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] Chemical group [O--].[Al+3].[Al+3].[O-][Si]([O-])([O-])[O-] YKTSYUJCYHOUJP-UHFFFAOYSA-N 0.000 claims description 17
- 238000010438 heat treatment Methods 0.000 claims description 15
- 238000001816 cooling Methods 0.000 claims description 13
- 239000011491 glass wool Substances 0.000 claims description 12
- 239000011521 glass Substances 0.000 claims description 9
- 230000004888 barrier function Effects 0.000 claims description 6
- 229920000742 Cotton Polymers 0.000 claims description 5
- 238000000926 separation method Methods 0.000 claims description 5
- 239000002023 wood Substances 0.000 claims description 5
- 230000000630 rising effect Effects 0.000 claims description 2
- 238000009422 external insulation Methods 0.000 claims 2
- 201000010099 disease Diseases 0.000 abstract description 4
- 208000037265 diseases, disorders, signs and symptoms Diseases 0.000 abstract description 4
- 239000011248 coating agent Substances 0.000 abstract 1
- 238000000576 coating method Methods 0.000 abstract 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 10
- 239000012774 insulation material Substances 0.000 description 8
- 230000008569 process Effects 0.000 description 8
- 230000000694 effects Effects 0.000 description 6
- 238000002156 mixing Methods 0.000 description 6
- 235000019362 perlite Nutrition 0.000 description 5
- 239000010451 perlite Substances 0.000 description 5
- 238000005336 cracking Methods 0.000 description 4
- 238000005516 engineering process Methods 0.000 description 4
- 238000007689 inspection Methods 0.000 description 4
- 230000002787 reinforcement Effects 0.000 description 4
- 239000000463 material Substances 0.000 description 3
- 238000000465 moulding Methods 0.000 description 3
- 238000005192 partition Methods 0.000 description 3
- 238000007789 sealing Methods 0.000 description 3
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 2
- 238000004873 anchoring Methods 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 239000011490 mineral wool Substances 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 229910001562 pearlite Inorganic materials 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 239000011150 reinforced concrete Substances 0.000 description 2
- 230000003014 reinforcing effect Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 235000015170 shellfish Nutrition 0.000 description 2
- 238000010025 steaming Methods 0.000 description 2
- 238000003756 stirring Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- 238000009529 body temperature measurement Methods 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 238000007405 data analysis Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000007710 freezing Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 210000003205 muscle Anatomy 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
-
- C—CHEMISTRY; METALLURGY
- C04—CEMENTS; CONCRETE; ARTIFICIAL STONE; CERAMICS; REFRACTORIES
- C04B—LIME, MAGNESIA; SLAG; CEMENTS; COMPOSITIONS THEREOF, e.g. MORTARS, CONCRETE OR LIKE BUILDING MATERIALS; ARTIFICIAL STONE; CERAMICS; REFRACTORIES; TREATMENT OF NATURAL STONE
- C04B40/00—Processes, in general, for influencing or modifying the properties of mortars, concrete or artificial stone compositions, e.g. their setting or hardening ability
- C04B40/02—Selection of the hardening environment
- C04B40/024—Steam hardening, e.g. in an autoclave
-
- 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
- E01D19/14—Towers; Anchors ; Connection of cables to bridge parts; Saddle supports
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Ceramic Engineering (AREA)
- Health & Medical Sciences (AREA)
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- Materials Engineering (AREA)
- Organic Chemistry (AREA)
- On-Site Construction Work That Accompanies The Preparation And Application Of Concrete (AREA)
Abstract
The invention discloses a method for maintaining special-shaped main tower construction section concrete in winter, which is used for a climbing formwork device and comprises the following steps: the outer side of the climbing formwork device is provided with a formwork outer heat-insulating body; installing each construction section above the lower tower column in turn in a segmented manner; erecting a thermal insulation shed frame on the top of the construction section; covering the heat preservation shed frame above the template outer heat preservation body, and coating the construction section; pouring concrete into the construction section; and carrying out steam curing on the inner box chamber of the concrete in the construction section so as to carry out winter curing on the concrete of the construction section of the special-shaped main tower. According to the invention, the steam curing is carried out on the initially-set concrete through the heat insulation shed frame and the external heat insulation body of the template on the climbing formwork device, so that the quality problems of frost heaving, cracks, structural diseases and the like of the concrete are prevented, the forming strength of the concrete is ensured, and the construction quality of the main tower concrete in winter is ensured.
Description
Technical Field
The invention relates to the technical field of main tower winter construction in alpine regions, in particular to a special-shaped main tower construction section concrete winter maintenance method.
Background
The cable-stayed bridge main tower has over high winter application heat preservation performance and no mature experience at home and abroad can be used as a reference. In order to ensure the construction period, the winter application cannot be avoided, the effect of winter application directly influences the construction quality of concrete, and the research on winter construction heat preservation technology is particularly important. During winter application, safety accidents are easy to cause by heating measures, quality problems such as frost heaving, cracks, structural diseases and the like of concrete can be caused by insufficient anti-freezing and heat-insulating measures, and the strength of the concrete is seriously influenced.
The international advice for construction in winter of concrete (RILEM, hereinafter referred to as "International advice") is made by RlLEM39-BH Commission, and is passed through the conference of London in 1981 and Moscow in 1984. It summarizes the experience of the world countries in winter construction technology in the last 20 years. The institute of low temperature construction science in Heilongjiang province was based on the version of Finnish Essimian, 1 month 1988, and was introduced in the national winter Congress in 1989. The concrete trial formulation and the application of new materials are mainly introduced, and the description of external heat preservation technology is less.
Therefore, the key problems in the construction field of the cable-stayed bridge in winter are paid attention to in the industry, related research results are continuously presented, and the practical problems of a large number of projects are solved, however, the macro control method is applied more, the application results in the special control field are less, and especially the problem of the main tower winter construction of the cable-stayed bridge is not deeply and systematically solved, and the key technical system of the winter construction is not fully mature.
Disclosure of Invention
The main purpose of the invention is that: the method aims to solve the technical problems that in the prior art, the application of a macroscopic control method is more, the application result in the special control field is less, especially the problem of the winter construction of the main tower of the cable-stayed bridge is not deeply and systematically solved, and the key technical system of the winter construction is not fully mature.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the invention provides a concrete winter maintenance method for a construction section of a special-shaped main tower, which is used for a climbing formwork device, wherein the climbing formwork device is arranged on the construction section along Zhou Xiangkuang of the construction section, the climbing formwork device comprises a climbing formwork, a climbing frame and climbing equipment, the construction section comprises an initial section, a current section and a target section, the current section is the next construction section of the initial section, and the target section is the next construction section of the current section, and the method comprises the following steps:
forming a lower tower column on the tower base; wherein the lower column comprises a bottom compartment;
arranging a template outer heat-insulating body on one side of the climbing formwork device, which is away from the construction section; wherein the outer heat insulator of the template is hung on the climbing template;
constructing the initial section by utilizing the climbing formwork device, and erecting a heat preservation shed frame on the top of the initial section;
a separation layer is arranged in the bottom box chamber; wherein the isolating layer, the heat insulation shed frame and the template outer heat insulator are enclosed together to form a first heat insulation box chamber which encloses the initial section;
pouring concrete into the initial section, and supplying heat to the incubator chamber to carry out steam curing on the concrete of the initial section;
after the steam curing of the initial section concrete is completed, removing the heat insulation shed frame and the isolating layer to obtain an initial formed section;
climbing the climbing formwork device above the initial forming section to construct the current section, and erecting the thermal insulation shed frame on the top of the current section;
disposing the barrier layer within the initial forming section; wherein the isolating layer, the thermal insulation shed frame and the external thermal insulation body of the template are enclosed together to form a second thermal insulation box chamber which seals the initial forming section and the current section;
pouring concrete to the current section, and supplying heat to the second insulation box chamber so as to carry out steam curing on the concrete of the current section and the initial forming section;
after finishing the steam curing of the concrete of the current section and the concrete of the initial forming section, removing the heat insulation shed frame and the isolating layer to obtain the current forming section;
climbing the climbing formwork device above the current formed section to construct the target section, and erecting the thermal insulation shed frame on the top of the target section;
providing the barrier layer within the current profiled section; wherein the isolating layer, the thermal insulation shed frame and the template outer thermal insulation body are enclosed together to form a third thermal insulation box chamber which seals the current forming section and the target section;
pouring concrete to the current section, and supplying heat to the third insulation box chamber so as to carry out steam curing on the concrete of the target section and the current formed section;
after finishing the steam curing of the concrete of the target section and the concrete of the current formed section, removing the heat insulation shed frame and the isolating layer to obtain the special-shaped main tower;
wherein, the thermal insulation shed frame covers the upper part of the outer thermal insulation body of the template.
Optionally, in the method for maintaining the special-shaped main tower construction section concrete in winter, the distance between the heat insulation shed frame and the top end of the climbing formwork device is 20cm.
Optionally, in the method for curing the special-shaped main tower construction section concrete in winter, the partition layer is an aluminum silicate plate.
Optionally, in the method for curing the special-shaped main tower construction section concrete in winter, the construction is performed on the initial section by using the climbing formwork device, and before the step of erecting a thermal insulation shed frame on top of the initial section, the method further comprises:
a miniature intelligent electric boiler is arranged on the climbing frame;
and arranging a steam pipeline in the construction section, and communicating the steam pipeline with the miniature intelligent electric boiler to supply heat to the construction section.
Optionally, in the method for curing the special-shaped main tower construction section concrete in winter, before the step of pouring concrete to the initial section and supplying heat to the incubator chamber to steam cure the concrete of the initial section, the method further includes:
setting preset parameters of steam curing to adapt to different stages of steam curing;
and heating the construction section through the steam pipeline according to the preset parameters.
Optionally, in the method for curing the special-shaped main tower construction section concrete in winter, the preset parameter is a heating rate, and the step of setting the preset parameter of steam curing to adapt to different stages of steam curing includes:
when the steam curing is in the heating stage, the heating rate V is adjusted 1 ；
Wherein, V is less than or equal to 6 ℃ per hour 1 ≤10℃/h。
Optionally, in the method for curing the special-shaped main tower construction section concrete in winter, the preset parameter is a temperature, and the step of setting the preset parameter of steam curing to adapt to different stages of steam curing includes:
when the steam curing is in a constant temperature stage, adjusting the temperature T;
wherein T is more than or equal to 15 ℃ and less than or equal to 30 ℃.
Optionally, in the method for curing the special-shaped main tower construction section concrete in winter, the preset parameter is a cooling rate, and the step of setting the preset parameter of steam curing to adapt to different stages of steam curing includes:
when the steam curing is in the cooling stage, the cooling rate V is adjusted 2 ；
Wherein V is 2 ≤5℃/h。
Optionally, in the method for curing the special-shaped main tower construction section concrete in winter, the step of arranging the external heat insulator of the template on one side of the climbing formwork device, which is away from the construction section, comprises the following steps:
installing a steel wire mesh on one side of the climbing formwork, which is away from the construction section;
an electric tracing band is arranged on the steel wire net;
installing a glass wool heat-insulating plate on the climbing formwork;
wherein, glass cotton heated board cover in electric tracing area deviates from the one side of wire net to form be the enclosed construction the template outer insulator.
Optionally, in the method for curing the special-shaped main tower construction section concrete in winter, the step of arranging the external heat insulator of the template on one side of the climbing formwork device, which is away from the construction section, comprises the following steps:
a wooden I-beam is installed on one side of the climbing formwork, which is away from the construction section;
embedding an electric tracing band on the wood I-beam;
installing a glass wool heat-insulating plate on the climbing formwork;
wherein, glass cotton heated board cover in electric tracing area deviates from the side of carpenter's word roof beam to form be the enclosed construction the template outer insulator.
The one or more technical schemes provided by the invention can have the following advantages or at least realize the following technical effects:
according to the special-shaped main tower construction section concrete winter maintenance method provided by the invention, the heat preservation rack is erected on the top of the formed upper tower column template, the heat preservation rack is covered above the template outer heat preservation body, the formed upper tower column template is covered, concrete is poured into the formed upper tower column template by utilizing the climbing formwork device, after the upper tower column section is formed, steam curing is carried out on the formed upper tower column section, the quality problems such as frost heaving, cracking and structural diseases of the concrete are prevented, the forming strength of the concrete is ensured, the winter construction quality of the main tower concrete in cold areas is ensured, the heat preservation difficulty of the top of the main tower under the condition of dense embedded bars is solved, and a reference basis is provided for a main tower winter construction technical system of a cable-stayed bridge.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are required in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that other drawings may be obtained from the drawings provided without inventive effort for a person skilled in the art.
FIG. 1 is a schematic flow chart of a method for curing special-shaped main tower construction section concrete in winter;
FIG. 2 is a schematic view of a climbing form device according to the invention;
FIG. 3 is a schematic view of the structure of the incubator room according to the present invention;
fig. 4 is a schematic cross-sectional structure of the external heat insulator according to the present invention.
Reference numerals illustrate:
| reference numerals | Name of the name | Reference numerals | Name of the name |
| 100 | Upper column segment | 200 | Climbing formwork device |
| 300 | External heat-insulating body for form | 400 | Thermal insulation shed frame |
| 500 | First insulation box | 700 | Vertical main reinforcement |
| 600 | Perlite | 310 | Glass wool insulation board |
| 320 | Electric tracing band | 330 | Steel wire mesh |
The achievement of the objects, functional features and advantages of the present invention will be further described with reference to the accompanying drawings, in conjunction with the embodiments.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments of the present invention. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It should be noted that, in the embodiment of the present invention, all directional indications (such as up, down, left, right, front, and rear … …) are merely used to explain the relative positional relationship, movement conditions, and the like between the components in a certain specific posture (as shown in the drawings), and if the specific posture is changed, the directional indication is changed accordingly.
In the present disclosure, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or system that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or system. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other like elements in a process, method, article, or system that comprises the element. In addition, the meaning of "and/or" as it appears throughout includes three parallel schemes, for example "A and/or B", including the A scheme, or the B scheme, or the scheme where A and B are satisfied simultaneously.
In the present invention, unless explicitly specified and limited otherwise, the terms "connected," "fixed," and the like are to be construed broadly, and for example, "connected" may be either a fixed connection or a removable connection or integrated; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium; the communication between the two elements can be realized, or the interaction relationship between the two elements can be realized.
In the present invention, if there is a description referring to "first", "second", etc., the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying a relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature.
In the present invention, suffixes such as "module", "assembly", "piece", "part" or "unit" used for representing elements are used only for facilitating the description of the present invention, and have no specific meaning per se. Thus, "module," "component," or "unit" may be used in combination.
The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances. In addition, the technical solutions of the embodiments may be combined with each other, but it is based on the fact that those skilled in the art can implement the combination of the technical solutions, when the technical solutions contradict each other or cannot be implemented, the combination of the technical solutions should be considered as not existing and not falling within the protection scope of the present invention.
The inventive concept of the present invention is further elucidated below in connection with some embodiments.
The invention provides a method for curing special-shaped main tower construction section concrete in winter.
Referring to fig. 1, 2, 3 and 4, fig. 1 is a schematic flow chart of a method for curing concrete of a construction section of a special-shaped main tower in winter according to the present invention; FIG. 2 is a schematic view of a climbing form device according to the invention; FIG. 3 is a schematic view of the structure of the incubator room according to the present invention; fig. 4 is a schematic cross-sectional structure of the external heat insulator according to the present invention.
In an embodiment of the present invention, as shown in fig. 1, 2, 3 and 4, a method for maintaining concrete of a construction section of a special-shaped main tower in winter is used for a climbing formwork device, the climbing formwork device is arranged along Zhou Xiangkuang of the construction section, the climbing formwork device comprises a climbing formwork, a climbing frame and climbing equipment, the construction section comprises an initial section, a current section and a target section, the current section is the next construction section of the initial section, the target section is the next construction section of the current section, and the method for maintaining concrete of the construction section of the special-shaped main tower in winter comprises:
step S100: forming a lower tower column on the tower base; wherein the lower tower column comprises a bottom box;
step S200: a template outer heat insulator 300 is arranged on one side of the climbing formwork device, which is away from the construction section; wherein the outer heat insulator 300 of the template is hung on the climbing template;
step S300: constructing the initial section by using a climbing formwork device, and erecting a heat-insulating shed frame on the top of the initial section;
step S400: a separation layer is arranged in the bottom box chamber; wherein the insulation layer, the thermal insulation shed frame and the external thermal insulation body 300 are enclosed together to form a first thermal insulation box 500 enclosing the initial section;
step S500: pouring concrete into the initial section, and supplying heat to the first insulation box 500 to perform steam curing on the concrete of the initial section;
step S600: after the steam curing of the initial section concrete is completed, removing the heat insulation shed frame and the isolating layer to obtain an initial formed section;
step S700: a climbing device is utilized to climb a climbing formwork device above the initial formed section to construct the current section, and a heat insulation shed frame is erected on the top of the current section;
step S800: setting a separation layer in the initial forming section; wherein the insulation layer, the thermal insulation shed frame and the external thermal insulation body 300 of the template are enclosed together to form a second thermal insulation box chamber which encloses the initial formed section and the current section;
step S900: pouring concrete to the current section, and supplying heat to the second insulation box chamber so as to carry out steam curing on the concrete of the current section and the initial formed section;
step S10: after finishing the steam curing of the concrete of the current section and the concrete of the initial formed section, dismantling the heat insulation shed frame and the isolating layer to obtain the current formed section;
step S11: a climbing device is utilized to climb a climbing formwork device above the current formed section so as to construct the target section, and a heat insulation shed frame is erected on the top of the target section;
step S12: setting a separation layer in the current molding section; wherein the insulating layer, the heat-insulating shed frame and the external heat-insulating body 300 of the template are enclosed together to form a third heat-insulating box chamber which encloses the current formed section and the target section;
step S13: pouring concrete to the current section, and supplying heat to the third insulation box chamber so as to carry out steam curing on the concrete of the target section and the current formed section;
step S14: after the steam curing of the concrete of the target section and the concrete of the current formed section is completed, dismantling the heat insulation shed frame and the isolating layer to obtain the special-shaped main tower;
wherein the thermal insulation shed frame covers the upper side of the outer thermal insulation 300 of the template.
For ease of understanding, one embodiment is shown below:
the method for erecting the thermal insulation shed frame comprises the following steps: erecting a shed frame on the top of the construction section; installing a reinforcing mesh on the top end of the shed frame; aluminum silicate plates are mounted on the reinforcing mesh to cover the tops of the construction segments.
The scheme is suitable for the winter application of the main tower of the bridge engineering main bridge, and is finished according to the construction period requirement on the premise of ensuring the safety quality for construction, so that the winter construction is carried out according to the scheme.
The main tower adopts a C55 reinforced concrete structure, the special-shaped cable tower and the anchoring section is provided with a prestressed reinforced concrete and steel anchor box, and the transverse bridge is herringbone and is divided into five parts from top to bottom, namely a tower crown, an upper tower column, a middle tower column, a lower tower column and a tower base (adopting C40 concrete). The height above the bridge tower bearing platform is 102.749m, and the height of the tower seat is 2m. The height of the cable tower above the bridge deck is 88m, the high span ratio is 0.64, and the center distance between the left tower column and the right tower column at the bottom of the tower is 47.82m. The transverse bridge of the tower crown is 6m wide and the longitudinal bridge is 6.8m long; two tower columns are downwards branched at the position of 55m of the tower height, each tower column is 4.3m wide in the transverse bridge direction, the central line of the bridge tower structure is gradually changed to a position 12m away from the tower base top according to the curvature radius 400.05m, the position 12m away from the tower base top is a straight line, the transverse width of the tower bottom is 7.5m, and the longitudinal length is 8.5m.
The outer section of the tower column is octagonal, the inner section of the tower column is octagonal, and the section size of the tower column is 4.3m and 6.8m. The left tower column and the right tower column are closed at the position of the height of 125.2m, the closed triangular area is of a hollow thin-wall structure, 5 transverse partition plates are arranged in the middle to be connected, and the thickness of the thin wall and the thickness of the partition plates are 600mm.
The anchor mode of stay cable in the tower adopts steel anchor box structure, sets up in last column, and No. 2 through 17 stay cable anchor on steel anchor box. The length of the steel anchor box is 5.2m, the width is 1.8m, and the height is 0.7 m-3.99 m, wherein the height of the base of the steel anchor box is 0.7m, and the sections of the steel anchor box are connected by high-strength bolts on site; the lowest end of the steel anchor box is anchored on the positioning steel bracket, the starting point elevation of the steel anchor box is 118.400m, the peak elevation is 158.050m, and the total height is 39.65m. The maximum hoisting weight of the steel anchor box is 19t, and the steel anchor box is hoisted in place by adopting a tower crane.
And (3) constructing a main tower column: the lower tower column of the main tower is constructed by adopting a turnover formwork, the middle tower column and the upper tower column are both constructed by adopting an HCB-100 type hydraulic automatic climbing formwork technology, two sets of hydraulic automatic climbing formwork machines are arranged on site, and the upper tower column and the lower tower column are constructed symmetrically. The template is configured to have the height of 4.85m, the lower package is 100mm, the upper package is more than 50mm, and the different vertical layering heights of the inclination are different. And the construction of the tower column is divided into 24 sections for casting, and the standard casting height is 4.5m. And the tower column is arranged along the bridge, the fourth section of the downward climbing surface plan is poured, the mounting frame body is arranged, and the third section of the upward climbing surface plan is poured, so that the mounting frame body is arranged. The side frame body of the closure section is reformed by adopting a climbing frame body, and each side adopts 2 truss frame bodies. ) And (3) constructing a closure area: and arranging embedded parts in the concrete of the tower column, and arranging brackets and steel supports to be synchronously poured with the tower column with the same height. And (3) construction of an anchoring area: the steel anchor box is hoisted by adopting a tower crane to be installed in place, and the cable tower concrete construction is carried out on the upper tower column while the steel anchor box is installed. And after the strength of the concrete reaches the requirement, performing prestress construction. Temporary active horizontal cross brace construction: three temporary active horizontal cross braces are arranged on the middle tower column, and each support is installed by utilizing a tower crane after the tower column is constructed to a certain section and applies corresponding pre-jacking force according to instruction requirements.
The main tower external heat preservation is implemented by the main template external heat preservation body 300, the external heat preservation body 300 is fixed on the outer side of the climbing formwork device 200, and climbs synchronously along with the climbing formwork device 200, and the top heat preservation body needs to be assembled and disassembled according to each section of the construction progress. The outer heat insulator 300 is fixed with 5cm x 5cm steel wire mesh 330 outside the template, electric tracing band 320 is arranged on the steel wire mesh 330 in an S-shaped manner, and then glass wool heat insulation board 310 is fixed to form a closed heat insulator. The outside heat preservation body is higher than the concrete top surface by at least 20cm, and the box top surface adopts aluminum silicate plate to seal, is higher than the concrete top surface by at least 20cm, ensures that the concrete top surface has steam cycle, and vertical main muscle 700 clearance adopts aluminum silicate plate and pearlite 600 to seal, reduces heat loss, and pearlite 600 is fire grade: class a; weight by volume: 80-250kg/m 3 The method comprises the steps of carrying out a first treatment on the surface of the Thermal conductivity coefficient: perlite 600 of 0.045W/(m 2. K).
In order to achieve the external heat preservation effect and ensure the concrete construction quality, a large number of tests and data analysis prove that the external heat preservation system of the main tower meets the requirements, firstly, 5 cm-5 cm steel wire nets 330 are fixed on the outer surface of a template, 15 cm-spaced electric heat tracing bands 320 are fixed on the steel wire nets 330, and the specific heat preservation materials are the steel wire nets 330, the electric heat tracing bands and 10cm glass heat preservation plates.
It should be noted that, in this embodiment and other embodiments, the micro intelligent electric boiler is used to supply heat to the incubator 500, for example: rated steam temperature: t=154 ℃; rated vapor pressure: p=0.5 MPa; boiler efficiency: η=93.5%; total power consumption: 73KW; the external dimensions (length x width x height) of the boiler are 600mm x 800mm x 1200mm.
According to the technical scheme, the heat insulation shed frame 400 is erected on the top of the formed upper tower column template, the heat insulation shed frame 400 is covered above the template outer heat insulation body 300, the formed upper tower column template is covered, concrete is poured into the formed upper tower column template by utilizing the climbing formwork device 200, after the upper tower column segment 100 is formed, steam curing is carried out on the formed upper tower column segment 100, the quality problems of frost heaving, cracking, structural diseases and the like of the concrete are prevented, the forming strength of the concrete is ensured, the construction quality of main tower concrete in cold areas in winter is ensured, the heat insulation problem of the top of the main tower under the condition of densely embedding the vertical main ribs 700 is solved, and a reference basis is provided for a main tower winter construction technical system of a cable-stayed bridge.
In one embodiment, the distance between the canopy frame and the top end of the climbing form device is 20cm.
Specifically, the outside thermal insulator 300 is higher than the top surface of the concrete, namely the top surface of the concrete of the initial section or the current section or the target section by at least 20cm, the top surface of the box chamber is sealed by adopting an aluminum silicate plate, and is higher than the top surface of the concrete by at least 20cm, so that the steam circulation of the top surface of the concrete is ensured, and when the concrete of the initial section or the current section or the target section is steamed, the construction of the vertical main reinforcement 700 can be performed on the next section, so that the steaming effect is ensured, the construction progress is prevented from being influenced, the construction efficiency is improved, and the construction cost is saved.
In one embodiment, the barrier layer is an aluminum silicate plate to ensure sealing effect and waterproof performance and durability of the barrier layer.
In one embodiment, the climbing formwork device is utilized to construct the initial section, and before the step of erecting the thermal insulation shed frame on top of the initial section, the method for curing the concrete of the construction section on top of the special-shaped main tower in winter further comprises the following steps:
step F100: a miniature intelligent electric boiler is arranged on the climbing frame;
step F200: and arranging a steam pipeline in the construction section, and communicating the steam pipeline with the miniature intelligent electric boiler to supply heat to the construction section.
Specifically, a steam pipeline is arranged in a main tower box, a simple shed frame is immediately erected at the top of the box after concrete pouring is completed, a heat insulation material is covered, and steam curing is performed after concrete is initially set.
After the reinforcement of the inner mold of each section of tower column is completed, a canopy frame is erected at the position of 20cm at the top of a box chamber of the tower column by adopting steel pipes with phi 48 mm x 3mm, and phi 20 reinforcing steel bar meshes are installed, wherein the grids are 20cm x 20cm. The top of the concrete is encapsulated by an aluminum silicate plate before pouring, aluminum silicate plates are also encapsulated by blocks between the two rows of steel bars, and the gaps between the vertical main bars 700 can be filled by perlite 600, so that a closed space is formed in the box chamber. When the heat preservation shed frame 400 is erected, the top surface of the concrete is required to be 20cm higher than the top surface of the later poured concrete, so that steam in the box chamber is circulated, the top concrete is prevented from being frozen, and the concrete quality is ensured. The top heat insulation material is fixed by adopting phi 12 steel bar meshes, so that the heat insulation material is prevented from being lost due to wind blowing.
Note that, in this embodiment and other embodiments, the aluminum silicate plate is of a fire rating: class a; weight by volume: 150kg/m 3 The method comprises the steps of carrying out a first treatment on the surface of the Thermal conductivity coefficient: aluminum silicate plate of 0.035W/(m2.K).
The main tower includes lower tower column and last tower column, adopts miniature intelligent electric boiler to supply heat, keeps warm to the inside of main tower, and miniature intelligent electric boiler settles on the operation platform of frame is climbed to hydraulic pressure, and steam pipe (DN 40mm rubber tube) gets into in the main tower by lower tower column exhaust hole (phi 100 mm), and the pipeline in all tower column outsides adopts the insulation material parcel. The upper and lower parts in the box are sealed by aluminum silicate plates, so that two sections are ensured to be maintained all the time.
And (3) arranging a steam pipeline in the main tower box, immediately erecting a simple shed frame on the top of the box after concrete pouring is completed, covering a heat insulation material, and carrying out steam curing after concrete is initially set, so that the temperature in the main tower box is ensured to be more than 10 ℃, and the steam curing should be in charge of special personnel. In order to prevent the surface of the main tower concrete from cracking, the temperature rise and reduction speeds are not more than 10 ℃/h, and the constant temperature is not more than 30 ℃. The steaming process comprises the following steps: heating, constant temperature and cooling. In the steam curing process, the rising and falling speed and the constant temperature should be strictly controlled, so that concrete cracking and structural deformation caused by overlarge temperature difference between the inner part and the outer part of the beam body or overhigh constant temperature are avoided, and the curing period is not less than 7 days.
In one embodiment, before the steps of pouring concrete to the initial section and supplying heat to the incubator chamber to steam cure the concrete of the initial section, the method for curing the concrete of the construction section of the special-shaped main tower in winter further comprises:
step G100: setting preset parameters of steam curing to adapt to different stages of steam curing;
step G200: and according to preset parameters, heating the construction section through the steam pipeline.
In an embodiment, the step of setting the preset parameters of the steam curing to adapt to different phases of the steam curing includes:
step G110: when the steam curing is in the heating stage, the heating rate V is adjusted 1 ；
Wherein, V is less than or equal to 6 ℃ per hour 1 ≤10℃/h。
Specifically, the temperature is slowly raised, the temperature is high and the humidity is low, the temperature raising rate is controlled to be 6-8 ℃ per hour in the first 2 hours, the temperature is widened to be 10 ℃ per hour in the second 1-2 hours, the damage to a concrete structure caused by the too high temperature raising is avoided, and the highest temperature is not more than 80 ℃.
In an embodiment, the step of setting the preset parameters of the steam curing to adapt to different phases of the steam curing comprises:
step G120: when the steam curing is in a constant temperature stage, the temperature T is adjusted;
wherein T is more than or equal to 15 ℃ and less than or equal to 30 ℃.
Specifically, the temperature is strictly controlled within 15-30 ℃, the constant temperature of the upper and lower parts in the main tower box is kept basically consistent, the excessive temperature difference of the inner surface of the structure is avoided, and the damage of local thermal shock to concrete is reduced. The constant temperature section often checks the tightness of the steam curing shed to prevent steam leakage; and inspecting the steam supply pipeline, and timely processing and recording the found problems.
In an embodiment, the step of setting the preset parameters of the steam curing to adapt to different phases of the steam curing includes:
step G130: when the steam curing is in the cooling stage, the cooling rate V is adjusted 2 ；
Wherein V is 2 ≤5℃/h。
Specifically, the steam is slowly stopped, the temperature is evenly reduced, and the humidity is kept. Especially controlling the cooling rate of the first 2 hours and the difference between the surface temperature of the structure and the ambient temperature at the end of cooling not exceeding the standard (20 ℃). Every 1 hour of temperature measurement, the cooling rate is controlled within 5 ℃/h, and the excessively rapid cooling is forbidden. When the difference between the surface temperature of the concrete and the ambient temperature is less than or equal to 20 ℃, the temperature of the concrete is less than 10 ℃ and the steam curing can be stopped after the concrete is stable.
In one embodiment, the step of disposing the external form insulation 300 on a side of the creeping formwork device facing away from the construction segment comprises:
step S210: installing a steel wire mesh 330 on the side of the climbing formwork away from the construction section;
step S220: laying an electric tracing band on the steel wire mesh 330;
step S230: installing a glass wool heat-insulating plate on the climbing formwork;
wherein, the glass wool insulation board covers one side of the electric tracing band away from the steel wire mesh 330 to form the template outer insulation body 300 with a closed structure.
Specifically, the outer heat insulator 300 is fixed 5cm x 5cm steel wire mesh 330 outside the template, electric tracing band 320 is laid on steel wire mesh 330 in an S-type manner, then glass wool heat insulation board 310 is fixed to form a closed heat insulator, the main tower outer heat insulator 300 is used for determining success or failure of construction quality of the main tower, after the outer heat insulator 300 is installed, the main inspection items are as follows: whether the steel wire mesh 330 is firmly fixed, whether the spacing between the electric tracing bands 320 meets the requirement, whether the electric tracing bands 320 and 320 are in insulation performance inspection, whether the electric tracing bands 320 are connected by joints in a heat insulation body, sealing performance inspection of a glass heat insulation plate and fire resistance inspection of the glass heat insulation plate are needed.
It should be noted that, in this embodiment and other embodiments, the electric tracing band 320 is of the type DXW-8Z; self-limiting temperature: 70+/-5 ℃; power: 25w/m; starting current: less than or equal to 0.55A/m; maximum length of use: a 50m self-temperature-controlled electric tracing band 320; and this embodiment and othersThe glass insulation board in the embodiment is of a fire-proof grade: class a; weight by volume: 10-32 kg/m 3 The method comprises the steps of carrying out a first treatment on the surface of the Thermal conductivity coefficient: 0.038W/(m 2. K) glass insulation board.
In one embodiment, to further ensure stability of the electric tracing band, the step of disposing the external form insulation 300 on a side of the climbing form device facing away from the construction segment includes:
step S201: a wood I-beam is installed on one side of the climbing formwork, which is away from the construction section;
step S202: embedding an electric tracing band on the woodworking beam;
step S203: installing a glass wool heat-insulating plate on the climbing formwork;
wherein, glass wool insulation board covers in the electric tracing band and deviates from the outside insulator 300 of template that is enclosed construction in order to form, and wooden I-beam passes through shellfish shaped steel and climbs the frame to be connected, climbs the frame and is shaped steel.
As an option of this embodiment, after the wood i-beam is connected with the climbing frame through shellfish, a steel wire mesh 330 is hung on the wood i-beam, then an electric tracing band 320 is arranged on the steel wire mesh 330 in an S-shape, and then a glass wool insulation board 310 is fixed to form a closed insulation body.
It can be understood that the biggest problem of main tower winter construction is the heat preservation maintenance of concrete, in order to guarantee the quality of concrete, the maintenance after heating and heat preservation to pouring of raw materials is all and is important:
(1) The raw materials should be heated before concrete mixing, so that frozen blocks in the aggregate are avoided, the mixing station adopts an electric heater to heat mixing water, and a water reservoir for mixing is covered with a heat-insulating material and is used as hot water for storage and standby. When the heating temperature of the water tank is not up to the required temperature by using the electric heater, a heating rod is added in the water tank to heat the water tank, so that the water temperature is ensured to be up to 40-60 ℃. The main machine of the mixing station adopts a heat-insulating sandwich board to carry out enclosure, an electric heater is arranged before concrete pouring, the indoor temperature of an operation room is ensured not to be lower than 10 ℃, and simultaneously, the drum barrel of the mixer is washed by hot water before and after the concrete is mixed. Before feeding, a hot water flushing stirrer should be adopted. The stirring time of the concrete is prolonged by 50 percent compared with the normal temperature and accords with the related regulations, the stirring time is set to 180S, and the temperature of the outlet machine is ensured to be more than 10 ℃. After the concrete mixture is discharged from the machine, the concrete mixture is transported to a pouring site in time.
(2) After concrete is stirred, the concrete tank truck is adopted to be transported to a pouring place in time, special canvas is covered and wrapped on the concrete tank truck in winter, so that heat preservation coverage in the transportation process is enhanced, the concrete molding temperature is ensured to be higher than 5 ℃, meanwhile, reasonable organization is realized, compact procedure arrangement is required, the truck is unloaded, and the waiting time of the concrete for molding is reduced. Before concrete pouring, preheating the on-site heat-insulating shed in advance, preheating the interior of the box chamber by adopting an air heater, prohibiting the use of steam, and preventing the interior steam from forming water drops to freeze after the top-layer heat-insulating cotton is opened in the concrete pouring process, and performing sealing work during preheating; and after the concrete mixing transport vehicle arrives at the site, the roof of the pouring part is uncovered in a separated area, and concrete is poured. And (5) after the concrete is poured, making a greenhouse cover. When the concrete is poured in winter, the joint surface is heated before new concrete is poured, so that the joint surface has the temperature of more than 5 ℃, and after the pouring is finished, measures are taken to keep the concrete joint surface at normal temperature until the specified frost resistance is obtained.
(3) The steel bars are welded under the negative temperature condition in winter, and all the steel bars should be arranged indoors as much as possible. If the welding is necessary outdoors, the ambient temperature is not lower than-20 ℃, and wind shielding measures are needed when the wind power exceeds level 3. The uncooled joints after welding are strictly forbidden to touch ice and snow, and the vertical main ribs 700 are mechanically connected.
(4) The main tower is internally provided with a miniature intelligent electric boiler for supplying heat, the steam generators are respectively arranged on the hydraulic climbing frame operating platform and extend into the maintenance sections through self-contained pipelines, and the box is sealed by aluminum silicate plates up and down, so that maintenance of the two sections is ensured all the time.
(5) The main tower external heat preservation is implemented by the main template external heat preservation body 300, the external heat preservation body is fixed on the outer side of the climbing formwork device, and climbs synchronously along with the climbing formwork device, and the top heat preservation body needs to be assembled and disassembled according to each section of the construction progress. The outer heat preservation body is fixed on the outer side of the template, S-shaped electric tracing bands are distributed, and then a rock wool heat preservation plate is fixed, so that the closed heat preservation body is formed. The outside heat preservation body is at least 20cm higher than the concrete top surface, the box top surface is sealed by adopting aluminum silicate plates and at least 20cm higher than the concrete top surface, the steam circulation on the concrete top surface is ensured, the gaps of the vertical main ribs 700 are sealed by adopting aluminum silicate plates and perlite, and the heat loss is reduced.
(6) After the reinforcement of the inner mold of each section of tower column is completed, a shed frame is erected on the top of a box chamber of the tower column by adopting steel pipes with the diameter of 48 mm x 3mm, and a phi 20 reinforcing steel bar net sheet is installed, wherein the grid is 20cm x 20cm. The top of the concrete is encapsulated by an aluminum silicate plate before pouring, aluminum silicate plates are also encapsulated by blocks between the two rows of steel bars, and the gaps between the vertical main bars 700 can be filled by perlite, so that a closed space is formed in the box. When the heat-insulating shed frame is erected, the top surface of the concrete needs to be 20cm higher than the top surface of the later poured concrete, so that the steam in the box chamber circulates, the top concrete is prevented from being frozen, and the concrete quality is ensured. The top heat insulation material is fixed by adopting phi 12 steel bar meshes, so that the heat insulation material is prevented from being lost due to wind blowing.
The temperature requirement of concrete can be met by using the scheme for winter construction, the quality of entities is guaranteed not to be problematic, the external heat preservation of the scheme adopts an electric tracing band and a rock wool board, the weight born by the climbing formwork climbing frame is greatly reduced, and the steam generator adopted by the inner box not only guarantees the required temperature of the concrete, but also guarantees the surface humidity of the concrete. The scheme has the advantages of simplicity and convenience in operation, high safety, environmental protection, no pollution, economy and the like, the heat insulation materials are fireproof materials, high-altitude fire is avoided, the main tower concrete is insulated to form a closed loop, the heat insulation effect is remarkable, and the concrete external heat insulation measures are fixed on the template to be insulated, so that heat insulation can be carried out along with lifting of the template, and waste caused by dismantling of the heat insulation measures is avoided.
It should be noted that, the foregoing reference numerals of the embodiments of the present invention are only for describing the embodiments, and do not represent the advantages and disadvantages of the embodiments. The above embodiments are only optional embodiments of the present invention, and not limiting the scope of the present invention, and all equivalent structures or equivalent processes using the descriptions of the present invention and the accompanying drawings or direct or indirect application in other related technical fields are included in the scope of the present invention.
Claims (10)
1. A method for winter maintenance of concrete of a construction section of a main tower, the method being characterized by comprising a climbing formwork device arranged on the construction section along Zhou Xiangkuang of the construction section, the climbing formwork device comprising a climbing formwork and a climbing frame, the construction section comprising an initial section, a current section and a target section, the current section being a next construction section of the initial section, the target section being a next construction section of the current section, the method comprising:
forming a lower tower column on the tower base; wherein the lower column comprises a bottom compartment;
arranging a template outer heat-insulating body on one side of the climbing formwork device, which is away from the construction section; wherein the outer heat insulator of the template is hung on the climbing template;
constructing the initial section by utilizing the climbing formwork device, and erecting a heat preservation shed frame on the top of the initial section;
a separation layer is arranged in the bottom box chamber; wherein the isolating layer, the heat insulation shed frame and the template outer heat insulator are enclosed together to form a first heat insulation box chamber which encloses the initial section;
pouring concrete into the initial section, and supplying heat to the first heat preservation box chamber so as to carry out steam curing on the concrete of the initial section;
after the steam curing of the initial section concrete is completed, removing the heat insulation shed frame and the isolating layer to obtain an initial formed section;
climbing the climbing formwork device above the initial forming section to construct the current section, and erecting the thermal insulation shed frame on the top of the current section;
disposing the barrier layer within the initial forming section; wherein the isolating layer, the thermal insulation shed frame and the external thermal insulation body of the template are enclosed together to form a second thermal insulation box chamber which seals the initial forming section and the current section;
pouring concrete to the current section, and supplying heat to the second insulation box chamber so as to carry out steam curing on the concrete of the current section and the initial forming section;
after finishing the steam curing of the concrete of the current section and the concrete of the initial forming section, removing the heat insulation shed frame and the isolating layer to obtain the current forming section;
climbing the climbing formwork device above the current formed section to construct the target section, and erecting the thermal insulation shed frame on the top of the target section;
providing the barrier layer within the current profiled section; wherein the isolating layer, the thermal insulation shed frame and the template outer thermal insulation body are enclosed together to form a third thermal insulation box chamber which seals the current forming section and the target section;
pouring concrete to the current section, and supplying heat to the third insulation box chamber so as to carry out steam curing on the concrete of the target section and the current formed section;
after finishing the steam curing of the concrete of the target section and the concrete of the current formed section, removing the heat insulation shed frame and the isolating layer to obtain the special-shaped main tower;
wherein, the thermal insulation shed frame covers the upper part of the outer thermal insulation body of the template.
2. The method for winter maintenance of special-shaped main tower construction section concrete according to claim 1, wherein the distance between the heat insulation shed frame and the top end of the climbing form device is 20cm.
3. The method for winter maintenance of special-shaped main tower construction section concrete according to claim 2, wherein the isolating layer is an aluminum silicate plate.
4. A method of winter maintenance of concrete for a construction section of a main tower in the special-shaped form as claimed in claim 3, wherein the step of constructing the initial section with the climbing form device and erecting a thermal insulation shed on top of the initial section is preceded by the step of:
a miniature intelligent electric boiler is arranged on the climbing frame;
and arranging a steam pipeline in the construction section, and communicating the steam pipeline with the miniature intelligent electric boiler to supply heat to the construction section.
5. The method for winter maintenance of special-shaped main tower construction section concrete according to claim 4, wherein before the step of pouring concrete into the initial section and supplying heat to the incubator chamber to steam cure the concrete of the initial section, the method further comprises:
setting preset parameters of steam curing to adapt to different stages of steam curing;
and heating the construction section through the steam pipeline according to the preset parameters.
6. The method for winter maintenance of special-shaped main tower construction section concrete according to claim 5, wherein the preset parameter is a temperature rising rate, and the step of setting the preset parameter of steam curing to adapt to different stages of steam curing comprises:
when the steam curing is in the heating stage, the heating rate V is adjusted 1 ；
Wherein, V is less than or equal to 6 ℃ per hour 1 ≤10℃/h。
7. The method for winter maintenance of special-shaped main tower construction section concrete according to claim 5, wherein the preset parameter is temperature, and the step of setting the preset parameter of steam curing to adapt to different stages of steam curing comprises:
when the steam curing is in a constant temperature stage, adjusting the temperature T;
wherein T is more than or equal to 15 ℃ and less than or equal to 30 ℃.
8. The method for winter maintenance of special-shaped main tower construction section concrete according to claim 5, wherein the preset parameter is a cooling rate, and the step of setting the preset parameter of steam curing to adapt to different stages of steam curing comprises:
when the steam curing is in the cooling stage, the cooling rate V is adjusted 2 ；
Wherein V is 2 ≤5℃/h。
9. The method for winter maintenance of concrete for a construction section of a main tower in profiled form according to any one of claims 1 to 8, wherein the step of providing an external insulation of the form on the side of the climbing form facing away from the construction section comprises:
installing a steel wire mesh on one side of the climbing formwork, which is away from the construction section;
an electric tracing band is arranged on the steel wire net;
installing a glass wool heat-insulating plate on the climbing formwork;
wherein, glass cotton heated board cover in electric tracing area deviates from the one side of wire net to form be the enclosed construction the template outer insulator.
10. The method for winter maintenance of concrete for a construction section of a main tower in profiled form according to any one of claims 1 to 8, wherein the step of providing an external insulation of the form on the side of the climbing form facing away from the construction section comprises:
a wooden I-beam is installed on one side of the climbing formwork, which is away from the construction section;
embedding an electric tracing band on the wood I-beam;
installing a glass wool heat-insulating plate on the climbing formwork;
wherein, glass cotton heated board cover in electric tracing area deviates from the side of carpenter's word roof beam to form be the enclosed construction the template outer insulator.
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