CN115095153A - Concrete chimney construction method without internal mold - Google Patents
Concrete chimney construction method without internal mold Download PDFInfo
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- CN115095153A CN115095153A CN202211032856.8A CN202211032856A CN115095153A CN 115095153 A CN115095153 A CN 115095153A CN 202211032856 A CN202211032856 A CN 202211032856A CN 115095153 A CN115095153 A CN 115095153A
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- 238000010276 construction Methods 0.000 title claims abstract description 55
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- 230000009194 climbing Effects 0.000 claims description 22
- 239000011449 brick Substances 0.000 claims description 11
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- 238000000034 method Methods 0.000 claims description 11
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- 238000009413 insulation Methods 0.000 claims description 6
- 239000004570 mortar (masonry) Substances 0.000 claims description 5
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- 230000005855 radiation Effects 0.000 claims description 3
- NLYAJNPCOHFWQQ-UHFFFAOYSA-N kaolin Chemical compound O.O.O=[Al]O[Si](=O)O[Si](=O)O[Al]=O NLYAJNPCOHFWQQ-UHFFFAOYSA-N 0.000 claims description 2
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- 238000013461 design Methods 0.000 description 4
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- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 4
- 239000011241 protective layer Substances 0.000 description 4
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
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- 230000003247 decreasing effect Effects 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 239000010720 hydraulic oil Substances 0.000 description 1
- 229910052739 hydrogen Inorganic materials 0.000 description 1
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- 238000009434 installation Methods 0.000 description 1
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Classifications
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/74—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls
- E04B1/76—Heat, sound or noise insulation, absorption, or reflection; Other building methods affording favourable thermal or acoustical conditions, e.g. accumulating of heat within walls specifically with respect to heat only
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/02—Conveying or working-up concrete or similar masses able to be heaped or cast
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/02—Conveying or working-up concrete or similar masses able to be heaped or cast
- E04G21/025—Buckets specially adapted for use with concrete
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H12/00—Towers; Masts or poles; Chimney stacks; Water-towers; Methods of erecting such structures
- E04H12/02—Structures made of specified materials
- E04H12/12—Structures made of specified materials of concrete or other stone-like material, with or without internal or external reinforcements, e.g. with metal coverings, with permanent form elements
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H12/00—Towers; Masts or poles; Chimney stacks; Water-towers; Methods of erecting such structures
- E04H12/28—Chimney stacks, e.g. free-standing, or similar ducts
Abstract
The invention discloses a concrete chimney internal-mould-free construction method, and belongs to the field of concrete chimney construction. Firstly, installing a chimney barrel body construction system; binding the steel bars of the chimney cylinder body, embedding the steel bars of the lining masonry, and binding the steel bars of the lining masonry and the steel bars of the chimney cylinder body into a whole; lifting the outer mold by one layer by using a hydraulic mold lifting device, and constructing a lining body in the layer; and pouring concrete between the outer mold and the lining masonry to form the concrete cylinder body. The invention adopts a chimney internal-mold-free construction method, pours the chimney barrel concrete between the external mold and the lining masonry, reduces construction steps, improves the overall construction efficiency, shortens the construction period, reduces the labor intensity and the investment of manpower, and reduces the construction cost.
Description
Technical Field
The invention relates to the field of concrete chimney construction, in particular to a concrete chimney internal-mould-free construction method.
Background
At present, a slip form or a reverse form is generally adopted in a reinforced concrete chimney barrel body construction method. The inner vertical derrick, the operation platform and the chimney are vertically transported, the derrick in a single hole is adopted, and materials, concrete and the like are transported by a concrete pump truck and a cage. The long objects such as the steel bars are transported by the pulling rod on the derrick. The cylinder body adopts the inner mold and the outer mold for construction in a matching way, and the inner and outer templates of the cylinder body adopt a hydraulic lifting or mechanical transportation mode. After the reinforced concrete chimney is bound by steel bars, the inner and outer molds are lifted or transported backwards, then the mold plates are reinforced, acceptance is qualified, concrete is poured, construction is sequentially and gradually carried out upwards, and a chimney lining brick (a refractory brick or a clay brick) and a heat insulation layer (rock wool or blast furnace granulated slag) are subsequently constructed to complete a construction task.
Disclosure of Invention
The invention relates to a concrete chimney internal mold-free construction method, which aims to reduce construction procedures and improve construction efficiency.
In order to solve the technical problems, the invention provides a concrete chimney internal mold-free construction method, which comprises the following steps:
the method comprises the following steps that firstly, a chimney barrel construction system is installed, wherein the chimney barrel construction system comprises a derrick, a hydraulic mold lifting device, a lifting gantry, an internal hanging platform and an operation platform; the hydraulic mold lifting device comprises a climbing jack and a climbing steel pipe which are arranged on the operation platform, the climbing jack is connected with the climbing steel pipe, and the bottom of the climbing steel pipe is fixedly connected with concrete on the top surface of the chimney foundation; the lifting gantry is arranged at the bottom of the outer end of the operating platform, and the internal hanging platform is arranged at the bottom of the inner side of the operating platform;
binding the steel bars of the chimney cylinder body, embedding lining masonry steel bars, and binding the lining masonry steel bars and the steel bars of the chimney cylinder body into a whole;
step three, lifting the outer mold by one layer by using a hydraulic mold lifting device, and constructing a lining body in the layer;
and step four, pouring concrete between the outer mold and the lining masonry to form a concrete cylinder body.
Further, in the first step, the operation platform comprises an operation platform pedestal and a bed plate, wherein the operation platform pedestal comprises a drum ring, a ring beam, a radiant beam and a platform pull rod; the drum rings comprise an upper drum ring and a lower drum ring which have the same diameter, and the upper drum ring and the lower drum ring are connected through a web member; the ring beam is coaxially arranged on the periphery of the upper drum ring, the radiation beam is connected between the upper drum ring and the ring beam, and the platform pull rod is connected between the ring beam and the lower drum ring.
Furthermore, the chimney barrel construction system also comprises a vertical transportation device consisting of a winch, a suspension cage and a concrete hopper.
And furthermore, in the third step, a supporting device is arranged between the lining masonry and the inner hanging platform, the supporting device comprises an enclosing purlin supported on the inner surface of the lining masonry, and supporting rods are connected to the side surfaces of the enclosing purlin and the inner hanging platform.
Further, in the third step, the inside lining brickwork internal surface sets up inside lining reinforcing vertical braces.
And further, in the third step, an outer mold inner support surrounding purlin is connected between the outer mold and the chimney barrel body steel bars.
And further, in the third step, when the lining masonry is constructed, the lining masonry in the middle of the chimney is made of red bricks by using a mixed mortar masonry machine, and the top of the chimney and the bottom of the chimney are made of clay fire clay slurry to build clay refractory bricks.
Further, an inner heat insulation layer is arranged on the outer side of the lining masonry.
The invention adopts a chimney internal-mold-free construction method, pours the chimney barrel concrete between the external mold and the lining masonry, reduces construction steps, improves the overall construction efficiency, shortens the construction period, reduces the labor intensity and the investment of manpower, and reduces the construction cost.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, illustrate exemplary embodiments of the invention and, together with the description, serve to explain the invention and not to limit the invention.
FIG. 1 is a schematic diagram of the construction of concrete placement between the outer mold and the lining masonry.
Fig. 2 is a schematic structural diagram of a chimney barrel construction system according to the invention.
In the figure, 1-outer mold, 2-inner supporting enclosing purlin of outer mold, 3-lining masonry steel bar, 4-chimney barrel steel bar, 5-inner heat insulation layer, 6-supporting device, 7-lining masonry, 8-lining reinforcing vertical support, 9-chimney barrel, 10-barrel bracket, 11-derrick, 12-hoisting portal, 13-inner hoisting platform, 14-operation platform, 15-climbing jack, 16-climbing steel pipe, 17-platform pull rod, 18-concrete hopper, 19-suspension cage, 20-guard rail, 21-derrick rigid cable, 22-machine rod, 23-machine rod expanding steel wire rope, 24-machine rod steel wire rope, 25-lifting steel wire rope, 26-track steel wire rope, 27-safety net, 28-electric basket.
Detailed Description
In order that those skilled in the art will better understand the present invention, a more complete and complete description of the present invention is provided below in conjunction with the accompanying drawings and embodiments. It should be noted that the features in the embodiments and examples in the present application may be combined with each other without conflict.
The typical embodiment of the invention provides a concrete chimney internal mold-free construction method, as shown in fig. 1, the method does not use an internal mold, and pours the concrete of a chimney barrel body 9 between an external mold 1 and a lining masonry 7, and comprises the following steps:
step one, installing a chimney barrel construction system;
binding the chimney cylinder body steel bars 4 and embedding lining masonry steel bars 3, and binding the lining masonry steel bars 3 and the chimney cylinder body steel bars 4 into a whole;
step three, lifting the outer mold 1 by one layer by using a hydraulic mold lifting device, and constructing a lining body 7 in the layer;
and step four, pouring concrete between the outer mold 1 and the lining masonry 7 to form a concrete cylinder body.
Taking a comprehensive utilization project of coking and hydrogen production of 360 ten thousand tons constructed by the applicant as an example, the project is totally 4 and 90 ten thousand tons of coking and matched production, and is used as a guarantee of the project for two highest chimneys of 165 meters in the whole field, the foundation embedding depth is 9.6m, the diameter of a foundation bottom plate is 26m, and the concrete strength grade is concrete C35. The outer diameter of a lower opening of the cylinder wall of the chimney main body is 12.94m, the inner diameter of a top opening is 6m, the wall thickness of 1.5 to 5m of the cylinder concrete is 550mm, the wall thickness of 5 to 15m is 520mm, the wall thickness of 15 to 25m is 490mm, the wall thickness of 25 to 35m is 460mm, the wall thickness of 35 to 45m is 440mm, the wall thickness of 45 to 55m is 420mm, the wall thickness of 55 to 65m is 400mm, the wall thickness of 65 to 75m is 380mm, the wall thickness of 75 to 85m is 360mm, the wall thickness of 85 to 95m is 340mm, the wall thickness of 95 to 105m is 320mm, the wall thickness of 105 to 115m is 300mm, the wall thickness of 115 to 125m is 280mm, the wall thickness of 125 to 135m is 260mm, the wall thickness of 135 to 145m is 240mm, the wall thickness of 145 to 155m is 220mm, and the wall thickness of 155 to 165m is 200 mm.
The stack shell adopts C30 commercial concrete, and the barrel reinforcing bar protective layer is 30mm, and chimney barrel slope does: 2.0 percent of 1.5-165 m section; lining of a chimney: using M5.0 mixed mortar to build MU10 machine-made red bricks from the elevation of 5.000-155.000, and using clay fire clay mortar to build clay refractory bricks from the elevation of 155.000-165.000 and the elevation below 5.000 and for smoke-proof walls; the inner heat insulation layer 5 between the lining masonry 7 and the barrel concrete is made of rock wool with gravity density of 2KN/m and has a heat conductivity coefficient lambda 0.05+ 0.0002T. A vertical steel ladder stand is arranged above +50m of the chimney body, a rotary steel ladder is arranged below +50m, and 3 layers of steel platforms are arranged at the positions +50m, +115m and +157.5m of the chimney. The concrete amount is 2205 cubic meters, and the steel bar is 220 tons.
After the chimney foundation has the barrel construction condition, a full scaffold is erected in a chimney foundation pit (below 1.5 m). According to the diameter of the bottom of the chimney and the weight loads of the operating platform 14, the hydraulic mold lifting device and the like, a chimney barrel construction system is designed.
As shown in fig. 2, the chimney barrel construction system comprises a derrick 11, a hydraulic mould lifting device, a lifting portal 12, an internal hanging platform 13 and an operating platform 14; the hydraulic mold lifting device comprises a climbing jack 15 and a climbing steel pipe 16 which are arranged on the operation platform 14, the climbing jack 15 is connected with the climbing steel pipe 16, and the bottom of the climbing steel pipe 16 is fixedly connected with concrete on the top surface of the chimney foundation; the lifting gantry 12 is arranged at the bottom of the outer end of the operating platform 14, and the internal hanging platform 13 is arranged at the bottom of the inner side of the operating platform 14.
In this example, a YHJ-36 model automatic control table 1 was used, and the operating pressure was 8 MPa. The climbing jack 15 adopts 18 GYD-60 type ball hydraulic jacks, and 2 jacks are reserved for use, wherein the lifting capacity of each work is 3t, the maximum lifting capacity is 6t, and the total work minimum lifting capacity is 60 t. The oil pipe adopts two types of phi 8 and phi 16 high-pressure oil pipes, the working pressure is 8Mpa, and the test pressure is 12 Mpa. The matching pipe joint and the oil separator are used as necessary supplement and connection of the oil circuit. The limiter is used for controlling the sliding and lifting level of the climbing jack 15, and reduces the level error of the operating platform 14 so as to ensure the integral flatness of the operating platform 14.
The method is characterized in that steel pipes with the diameter of 48 multiplied by 3.5 are adopted as climbing steel pipes 16, the total number of the steel pipes is 2, the total designed length of each steel pipe is 161m, steel pipe joints are connected by welding, when the steel pipes begin to slide on the cylinder wall, the climbing steel pipes 16 all fall on concrete on the top surface of a chimney foundation and are welded and fixed with a cylinder wall reinforcing mesh, and the length of a support rod is 5 groups of four specifications of 6m, 4.50m, 3.00m and 1.50 m. A safety net 27 is provided around the lifting mast 12.
18 trusses of the portal lifting frames in an open shape (the height of the portal is 400 mm) are uniformly distributed and symmetrically distributed along the circumference of the operating platform 14, and the net width between the upright posts of the portal lifting frame 12 is as follows:
F=A+2（B+C）=800+160×2+200+180=1500mm。
a-the maximum wall thickness of the chimney is 550 mm;
b, spacing between the concrete surface and the inner part of the lifting frame is 200mm (outer) and 180mm (inner);
c-the width of the lifting frame is 1500mm, and the height is 400 mm.
The diameter adjusting device is a device for controlling the diameter change of the construction platform, the diameter can be adjusted manually in the embodiment, namely, 18 chain blocks of 1t are adopted, one end of each chain block is arranged on the lifting gantry 12, the other end of each chain block is arranged on a central drum ring of the operation platform 14, and when the operation platform 14 needs to be reduced, the chain blocks can be used for completing the reduction work of the operation platform 14.
The operation platform 14 comprises an operation platform pedestal and a bed plate, wherein the operation platform pedestal comprises a drum ring, a ring beam, a radiant beam and a platform pull rod 17; the drum rings are an upper drum ring and a lower drum ring which have the same diameter, and the upper drum ring and the lower drum ring are connected through a web member; the ring beam is coaxially arranged on the periphery of the upper drum ring, the radiation beam is connected between the upper drum ring and the ring beam, and the platform pull rod 17 is connected between the ring beam and the lower drum ring. The outer end of the operating platform 14 is provided with a guard rail 20, the middle part of the operating platform 14 is provided with a machine rod 22, and the lower part of the operating platform 14 is provided with an electric hanging basket 28.
Wherein, the drum circle is the same upper and lower twice steel rings of diameter, uses bolted connection through the web member, and drum circle external diameter gets 2.50m, and drum circle height gets 1.80 m. The ring beam is made of 12# channel steel; 18 sets of flexible platform pull rods 17 are adopted, and 50 mm-thick wood boards are adopted for the planking.
The hydraulic system includes: 1 hydraulic operating console, 18 climbing steel pipes 16 and 18 climbing jacks, an oil circuit network, hydraulic oil and needle valves, oil separators and the like.
The chimney barrel body construction system also comprises a vertical transportation device consisting of a winch, a suspension cage 19 and a concrete hopper 18.
And after the chimney barrel construction system is installed, binding the chimney barrel steel bars 4 and embedding lining masonry steel bars 3 in advance.
The blanking length, the lap joint length and the spacing of the reinforcing steel bars are strictly executed according to the design and the current relevant standard requirements. The chimney body reinforcing steel bars 4 comprise barrel wall vertical reinforcing steel bars and barrel wall circumferential horizontal reinforcing steel bars. Cylinder wall vertical reinforcing steel: binding joints are adopted according to the requirements of design drawings, the lap length of the binding joints is not less than 50d and the design requirements are met, and the number of the joints on the same level is not more than one fourth of the total number of the vertical steel bars. Cylindrical wall circumferential horizontal steel bars: the binding joints are adopted, the lap joint length is not less than 45d and the design requirements are met, the horizontal rib joints with the same section are not more than 25%, and the thickness of the reinforcing steel bar protective layer on the cylinder wall is 30 mm.
The lining masonry steel bars 3 and the chimney barrel body steel bars 4 are bound into a whole. The overhanging length 400mm of inside lining brickwork reinforcing bar 3 covers the thickness of interior heat insulating layer 5 and inside lining brickwork 7, and the overhanging tip of inside lining brickwork reinforcing bar 3 is connected with the purlin that encloses that supports in inside lining brickwork 7 internal surface.
And lifting the outer die 1 by one layer by using the hydraulic die lifting device, and constructing the lining body 7 in the layer.
Manufacturing an outer die 1: the sliding formwork of the chimney is only the outer formwork 1, the outer formwork of the chimney body is a galvanized iron sheet formwork with the thickness of 3mm, the outer formwork is manufactured according to the contraction ratio of the chimney barrel, the outer formwork is processed to be 1.76M high and 1.25M wide, 36 blocks are punched at the edge of the outer formwork, the outer formwork is connected into four pieces by M5 multiplied by 15 bolts, the total length is based on the circumference of the barrel, the outer formwork is tightened according to the contraction ratio of the chimney barrel during construction, and the requirement of the chimney barrel is met.
Installing a chimney barrel template: and (3) brushing a release agent on the assembled four outer dies, then moving the outer dies to the outer side of the bound chimney barrel body steel bars 4 to install the barrel wall outer template, fixing the lower opening of the outer template to the outer side of the welded steel bar protective layer, wherein in the later barrel wall construction, the lower opening of each outer template can be directly fixed to the upper opening of the poured barrel body concrete and is overlapped with the concrete barrel wall for 30-50 mm, the upper openings of the templates are welded on a circumferential horizontal steel bar on the upper part of the barrel wall by a phi 12 steel bar rod to control the thickness of the protective layer of the outer template and the barrel wall concrete, the length of the steel bar rod is equal to the thickness of the barrel wall of the chimney, and the pouring height of the concrete is at the lower opening of the steel bar rod of the control template so as to remove the steel bar rods after the concrete is formed. And then reinforcing the outer template according to the actual size of the outer diameter of the cylinder wall, namely tightening 14 steel bars with the diameter of 10 by adopting an M28 screw rod. When the outer templates are overlapped to be beyond 0.80m, removing one outer template in time to avoid overlong overlapping; the outside reinforcing steel bar head at the overlapped part of the two templates is sleeved by a plastic cap to prevent the reinforcing steel bar head from exposing out of the concrete surface.
Lifting of the outer die 1: 18 chain blocks (which are gradually decreased to 12 according to the reduction of the diameter of the cylinder body) of 1t are arranged on a ram of a climbing jack 15, and when the concrete reaches the stripping strength of 2.5N/mm 2 And then, loosening the outer side screw rod of the outer template and the 1 steel bar enclosure, standing on the scaffold plate of the operating platform 14 by personnel, and gradually and uniformly lifting the outer template upwards by using a chain block. Lifting the outer template in place, fastening 2 flat steels at the lower opening of the template in advance, correcting the center of the template, and aligning the outer template with the flat steelsAnd (5) fastening the rest reinforcing steel bars at the upper opening of the template, and then removing the chain block lifted by the outer die.
As shown in fig. 1, an external mold inner supporting surrounding purlin 2 is connected between an external mold 1 and a chimney shaft steel bar 4.
And (3) constructing a lining masonry 7: using M5.0 mixed mortar to build MU10 machine-made red bricks from elevation 5.0-155M, using clay fire mud to build clay refractory bricks from elevation 155-165M and elevation below 5M, and using clay fire mud to build smoke-proof wall.
As shown in fig. 1, an inner insulating layer 5 is arranged inside the lining masonry 7. The gravity density between the lining and the concrete is 2KN/m 3 The rock wool is used as a heat insulation layer, the heat conductivity coefficient is 0.05+0.0002T, and the rock wool is vertically arranged.
Set up strutting arrangement 6 between inside lining brickwork 7 and interior platform 13 that hangs, strutting arrangement 6 encloses the purlin including supporting in 7 internal surfaces of inside lining brickwork, encloses the purlin and is connected with the bracing piece with interior platform 13 side that hangs, the bracing piece can adopt two channel-section steels to connect, sets up a plurality of connecting holes on the channel-section steel, and the length of realizing the bracing piece is adjustable at the downthehole construction bolt of connecting of difference.
As shown in figure 1, in order to further improve support intensity and support stability, the inside surface of the lining masonry 7 is provided with a vertical steel plate as a lining reinforcing vertical support 8, and the surrounding purlin is fixed on the surface of the lining reinforcing vertical support 8.
Finally, concrete is poured between the outer mould 1 and the lining masonry 7.
Material and transportation of concrete: the outer cylinder of the chimney is made of commercial concrete, and the main body of the chimney is made of pumping concrete for an automobile in a range of +1.5 to +35.00 m. The chimney + 35.00- +165.00m is provided with a concrete charging barrel by a single-barrel winch, the diameter of the circular concrete charging barrel is 900mm, the height of the circular concrete charging barrel is 1100mm, the vertical transportation of the concrete is about 0.60 cubic meter each time, the concrete is poured by a vertical transportation method, the horizontal transportation of the charging barrel is carried out by a rail car, the vertical transportation is carried out by a platform center derrick 11 and the winch, after the corresponding height is reached, a discharging door is opened and the concrete is poured into a mold through a sliding barrel, and the concrete pouring of the wall of each mold barrel is carried out.
Required concrete volume, hoist engine lifting speed should be calculated before chimney concrete placement to in considering the blowing process, calculating whole concrete construction, carry out the required concrete feed cylinder number of times about the concrete construction through the concrete feed cylinder, and then reacing whole pouring time, quality when guaranteeing concrete placement rationally arrange the concrete volume and the transportation time interval that each car concrete transported.
Pouring concrete: and after each procedure is checked and accepted to be qualified, wetting the surface of the concrete by water, then performing concrete pouring, wherein the pouring height of each mould is 1.70m, the strength grade of the concrete is C30, the binding condition of the steel bars, the position of embedded parts, down-lead welding and the like are checked before pouring to ensure that the pouring can be performed after no error, and the pouring is performed in a layered mode and is vibrated, and the pouring thickness of each layer is not more than 300 mm. During vibration, the inserted vibrator is inserted fast and pulled slowly, the inserted points are arranged uniformly and moved point by point without leakage, so that uniform vibration is realized, the vibration duration time of each vibration point is determined by the fact that concrete does not sink any more and the surface presents floating slurry, and excessive vibration and leakage vibration are prevented.
Curing the cylinder concrete: curing the formed concrete cylinder wall within 12 hours after the concrete pouring of each mould is finished, wherein the curing is performed by adopting a method of brushing a curing liquid; the brushing method comprises the following steps: and (3) filling the finished product curing liquid into a 10kg iron bucket, hoisting the finished product curing liquid to a construction platform by a winch, and uniformly brushing the outer surface of the cylinder wall of the concrete after the form is removed by adopting a manual brushing method. Or a 165m high-lift water pump is adopted to pump water upwards for spraying maintenance.
And (3) pouring and tamping layer by layer, wherein each time is about 60cm, a special person is arranged to direct the pouring, and after one circle of pouring is finished, the second layer of concrete is poured and tamped circularly and is poured to the top of the template continuously. And after the concrete is cast and tamped to the top of the template in a circulating way, the platform can enter a normal sliding-lifting stage, the platform slides and lifts in place, reinforcing steel bars are transported, then reinforcing steel bar correction, binding, template installation and concrete pouring are carried out, and the inner and outer templates are manually poured to the upper layer when the concrete reaches the template removal strength. When concrete is poured, the inner side of the chimney barrel 9 is poured to form a step-shaped barrel bracket 10, and a supporting structure of the lining building block on the upper layer is formed.
Hoisting and correcting deviation: generally, for a single cylindrical structure, the most easily-occurred deviation is central deviation and platform structure torsion, and particularly, the platform torsion has great harm to the stress state of the whole platform, and the central adjustment and the torsion adjustment of the structure must be performed in time.
The scope of the invention is not limited to the above embodiments, and various modifications and changes may be made by those skilled in the art, and any modifications, improvements and equivalents within the spirit and scope of the invention are intended to be included therein.
Claims (8)
1. A concrete chimney inner mold-free construction method is characterized by comprising the following steps:
the method comprises the following steps that firstly, a chimney barrel construction system is installed, wherein the chimney barrel construction system comprises a derrick, a hydraulic mold lifting device, a lifting gantry, an internal hanging platform and an operation platform; the hydraulic mold lifting device comprises a climbing jack and a climbing steel pipe which are arranged on the operation platform, the climbing jack is connected with the climbing steel pipe, and the bottom of the climbing steel pipe is fixedly connected with concrete on the top surface of the chimney foundation; the lifting gantry is arranged at the bottom of the outer end of the operating platform, and the internal lifting platform is arranged at the bottom of the inner side of the operating platform;
binding the steel bars of the chimney cylinder body, embedding lining masonry steel bars, and binding the lining masonry steel bars and the steel bars of the chimney cylinder body into a whole;
lifting the outer mold by one layer by using a hydraulic mold lifting device, and constructing a lining body in the layer;
and step four, pouring concrete between the outer mold and the lining masonry to form a concrete cylinder body.
2. The concrete chimney inner-mold-free construction method according to claim 1, characterized in that: in the first step, the operation platform comprises an operation platform base frame and a floor plate, wherein the operation platform base frame comprises a drum ring, a ring beam, a radiant beam and a platform pull rod; the drum rings comprise an upper drum ring and a lower drum ring which have the same diameter, and the upper drum ring and the lower drum ring are connected through a web member; the ring beam is coaxially arranged on the periphery of the upper drum ring, the radiation beam is connected between the upper drum ring and the ring beam, and the platform pull rod is connected between the ring beam and the lower drum ring.
3. The concrete chimney inner-mold-free construction method according to claim 2, characterized in that: the chimney barrel body construction system also comprises a vertical transportation device consisting of a winch, a suspension cage and a concrete hopper.
4. The concrete chimney inner-mold-free construction method according to claim 1, 2 or 3, characterized in that: and in the third step, a supporting device is arranged between the lining masonry and the internal hanging platform, the supporting device comprises an enclosing purlin supported on the inner surface of the lining masonry, and supporting rods are connected to the side surfaces of the enclosing purlin and the internal hanging platform.
5. The concrete chimney inner-mold-free construction method according to claim 4, characterized in that: and in the third step, the inner surface of the lining masonry is provided with a lining reinforcing vertical support.
6. The concrete chimney inner-mold-free construction method according to claim 5, characterized in that: and in the third step, the external mold and the steel bars of the chimney barrel body are connected with the internal supporting purlin of the external mold.
7. The concrete chimney inner-mold-free construction method according to claim 1, 5 or 6, characterized in that: in the third step, when the lining masonry is constructed, the lining masonry in the middle of the chimney is made of red bricks by using a mixed mortar masonry machine, and the top of the chimney and the bottom of the chimney are made of clay fire clay slurry to build clay refractory bricks.
8. The concrete chimney inner-mold-free construction method according to claim 7, characterized in that: an inner heat insulation layer is arranged on the outer side of the lining masonry.
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| CN202211032856.8A CN115095153A (en) | 2022-08-26 | 2022-08-26 | Concrete chimney construction method without internal mold |
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| CN202211032856.8A CN115095153A (en) | 2022-08-26 | 2022-08-26 | Concrete chimney construction method without internal mold |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117627342A (en) * | 2024-01-26 | 2024-03-01 | 山西一建集团有限公司 | Chimney lining construction mold turning inner formwork construction platform and construction method |
| CN117627342B (en) * | 2024-01-26 | 2024-04-19 | 山西一建集团有限公司 | Chimney lining construction mold turning inner formwork construction platform and construction method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN117627342A (en) * | 2024-01-26 | 2024-03-01 | 山西一建集团有限公司 | Chimney lining construction mold turning inner formwork construction platform and construction method |
| CN117627342B (en) * | 2024-01-26 | 2024-04-19 | 山西一建集团有限公司 | Chimney lining construction mold turning inner formwork construction platform and construction method |
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Application publication date: 20220923 |