CN111441525A - Large-span dome support keel formwork connecting system and construction method - Google Patents

Large-span dome support keel formwork connecting system and construction method Download PDF

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Publication number
CN111441525A
CN111441525A CN202010363743.0A CN202010363743A CN111441525A CN 111441525 A CN111441525 A CN 111441525A CN 202010363743 A CN202010363743 A CN 202010363743A CN 111441525 A CN111441525 A CN 111441525A
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CN
China
Prior art keywords
arc
keel
concrete
steel pipe
shaped
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Withdrawn
Application number
CN202010363743.0A
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Chinese (zh)
Inventor
卫芷
刘勇庆
籍跃奎
穆锦峰
秦宏磊
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China Shanxi Sijian Group Co Ltd
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China Shanxi Sijian Group Co Ltd
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Priority to CN202010363743.0A priority Critical patent/CN111441525A/en
Publication of CN111441525A publication Critical patent/CN111441525A/en
Withdrawn legal-status Critical Current

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    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04BGENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
    • E04B7/00Roofs; Roof construction with regard to insulation
    • E04B7/08Vaulted roofs
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04GSCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G11/00Forms, shutterings, or falsework for making walls, floors, ceilings, or roofs
    • E04G11/36Forms, shutterings, or falsework for making walls, floors, ceilings, or roofs for floors, ceilings, or roofs of plane or curved surfaces end formpanels for floor shutterings
    • E04G11/48Supporting structures for shutterings or frames for floors or roofs
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04GSCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G11/00Forms, shutterings, or falsework for making walls, floors, ceilings, or roofs
    • E04G11/36Forms, shutterings, or falsework for making walls, floors, ceilings, or roofs for floors, ceilings, or roofs of plane or curved surfaces end formpanels for floor shutterings
    • E04G11/48Supporting structures for shutterings or frames for floors or roofs
    • E04G11/50Girders, beams, or the like as supporting members for forms
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04GSCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G11/00Forms, shutterings, or falsework for making walls, floors, ceilings, or roofs
    • E04G11/36Forms, shutterings, or falsework for making walls, floors, ceilings, or roofs for floors, ceilings, or roofs of plane or curved surfaces end formpanels for floor shutterings
    • E04G11/48Supporting structures for shutterings or frames for floors or roofs
    • E04G11/50Girders, beams, or the like as supporting members for forms
    • E04G11/52Girders, beams, or the like as supporting members for forms of several units arranged one after another
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04GSCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
    • E04G21/00Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
    • E04G21/02Conveying or working-up concrete or similar masses able to be heaped or cast
    • E04G21/10Devices for levelling, e.g. templates or boards

Abstract

The invention provides a large-span dome supporting keel formwork connecting system which comprises a supporting system, a keel system and a panel system, wherein the keel system is arranged on the supporting system; the supporting system comprises a concrete cushion layer and a wheel buckle type formwork; the keel system comprises an arc-shaped main keel and a secondary keel; the panel system includes a panel thickness controller and a bamboo plywood mold for concrete placement. Stable structure, long service life and good construction economy.

Description

Large-span dome support keel formwork connecting system and construction method
Technical Field
The invention relates to the technical field of building construction, in particular to a large-span dome support keel formwork connecting system and a construction method.
Background
At present, a reinforced concrete dome construction method is mainly adopted for reinforcing a reinforced truss. The method comprises the following steps: preparing work, performing field measurement and lofting, positioning a dome axis and an elevation, blanking a steel bar truss, splicing the dome truss, welding, hoisting and positioning the steel bar truss, casting a keel, positioning, binding a secondary keel, fixing, installing and constructing a dome bottom layer template, binding a dome steel bar, and reinforcing a dome cover plate. When the change of the arc angle of the elliptic curved surface is large, great difficulty is brought to the formwork reinforcing construction.
Disclosure of Invention
The invention aims to provide a large-span dome support keel formwork connecting system.
In order to achieve the purpose, the invention provides the following technical scheme: a large-span dome supports fossil fragments die carrier connected system, includes braced system, fossil fragments system and panel system; the supporting system comprises a concrete cushion layer and a wheel buckle type formwork; the keel system comprises an arc-shaped main keel and a secondary keel; the panel system includes a panel thickness controller and a bamboo plywood mold for concrete placement.
Furthermore, L50 angle steel connecting components are arranged at the joints of the arc main keels and the secondary keels, and the angle steels and the arc main keels are vertically and fixedly connected through alloy head self-tapping screws.
Further, the plate thickness controller comprises a water stopping screw rod, the water stopping screw rod is arranged in a quincunx shape, and a nut is welded and fixed at the connecting position of the water stopping screw rod and the inner side and the outer side of the template.
A construction method of a large-span dome support keel formwork connecting system comprises the following steps:
the method comprises the following steps of firstly, controlling the flatness of a concrete cushion layer, and operating in the following mode:
(1) before the construction of the concrete cushion, firstly making ash cakes on the ground, wherein the longitudinal and transverse intervals of the ash cakes are 2m, and controlling the ash cakes to be super-flat by using a level gauge;
(2) popping up 500mm control lines on concrete columns and brick walls around the pouring area in advance, and performing technical bottom crossing on workers;
(3) when concrete is poured, the flatness of the cushion layer is controlled by using pull wires;
and secondly, detecting and controlling the model in the following operation mode:
(1) when a layer of the die carrier is built, a specially-assigned person is sent to the project department as a detection control point, and original data is recorded;
(2) after the construction of the die carrier is carried out for each time of load setting, a specially-assigned person is sent to monitor until the die carrier is removed;
thirdly, processing the arc-shaped steel pipe in the following operation mode:
(1) carrying out on-site lofting according to an arc-shaped large sample calculated by CAD software in advance, popping up the line size of a longitudinal and transverse main control line on the on-site concrete ground, popping up small lines, nailing a steel nail on each small node, drawing a dome arc line by utilizing a 14# iron wire to be attached to the steel nail, sequentially drawing the dome arc-shaped large sample line according to the thickness of a template, the height of a secondary keel and the section of a main keel, and finally popping out a beam and an outer contour line of a beam template to calculate the size of an arc-shaped steel pipe;
(2) the reinforcing steel bar heads with the length of 250mm and the diameter of 12mm are driven into the concrete at the distance of 300mm on the two sides of the inner line and the outer line of the main keel steel pipe for 150mm, and the steel pipe with the corresponding length is bent out of a first arc-shaped steel pipe according to the large CAD sample size to serve as a comparison template;
(3) placing other steel pipes into hydraulic steel pipe bender equipment, slowly bending and forming the steel pipes from one end to the other end by using a physical method, measuring the linear dimensions of the two ends of the arc-shaped steel pipe by using a box ruler after bending and forming, and ensuring that the linear dimensions of the two ends of the arc-shaped steel pipe are consistent with the chord length of a large sample on a drawing;
(4) if the radian cannot meet the requirement, correcting by using simple bending equipment;
step four, the arc keel is connected with the secondary keel, and the operation mode is as follows:
(1) because the connection between the arc steel pipe keel and the secondary keel is unstable and easy to slide, L50 angle steel connecting components are additionally arranged at the connection part of the main keel and the secondary keel;
(2) marking the center position of the secondary keel on a pre-placed arc ink line big sample, wherein the distance between the secondary keels is 200mm, and the secondary keel is arranged perpendicular to the arc keel;
(3) placing the end part of the arc-shaped steel pipe and the arc-shaped ink line correspondingly, aligning the ink line mark position by using a mark pen, and sequentially marking the center position of the secondary keel on the steel pipe;
(4) cutting the angle steel into 10cm sections, and vertically and fixedly connecting the angle steel with the arc keel by using a 15mm flat-head alloy head self-tapping screw;
(5) after the angle steel is fixedly installed, checking whether the distance position of the angle steel is accurate, and performing spot welding on the back of the angle steel and the arc-shaped steel pipe after determining that the angle steel is correct, so as to ensure that the angle steel is firmly connected with the steel pipe;
fifthly, installing a crotch type formwork in the following operation mode:
(1) the dome template support adopts a wheel buckle type full hall scaffold, the distance between vertical rods is 900mm × 900mm, the horizontal rod distribution distance is encrypted at the section from elevation 19.00m to elevation 26.7m, and the distance is 0.6 m;
(2) small cross bars and inclined support bars are additionally arranged at the positions, close to the dome, of the elevations of 21.0-26.7m to reinforce the arc-shaped main keels, the small cross bars are connected with at least two upright rods of the full hall frame, and the arc-shaped main keel steel pipes are easy to slide relative to the upright rods, so that the main keel steel pipes are usually pulled by one pull rod, and the pull rods and the transverse horizontal rods are pulled by fasteners;
(3) because the thickness of the arc-shaped plate must be reduced, in order to prevent the arc-shaped steel pipe from downwarping, a crotch-shaped inclined strut is additionally arranged between the two vertical rods, the inclined strut steel pipe and the vertical rods form an included angle of 45-60 degrees as much as possible, the inclined strut is vertically tangent to the side line of the arc-shaped steel pipe, the die carrier system is ensured to be relatively stable, and vertical shearing force is transmitted to the vertical rods through the inclined strut and the jackscrew;
(4) the inclined strut steel pipe is connected with the vertical rod and the horizontal rod by fasteners, and after the lowest end of the inclined strut steel pipe is connected with the vertical rod and the horizontal rod, a safety fastener is added to prevent the fasteners from sliding;
(5) after each fastener is installed, a torque wrench is required to check the torque value of the fastener, and the torque value of the fastener is ensured to be in place;
sixthly, manufacturing a plate thickness controller, wherein the operation mode is as follows:
(1) because the plate surface of the box type mould is easy to contact with the plate steel bar, the mould has two functions of controlling the thickness of the concrete plate and the thickness of the protective layer on the surface of the concrete when being arranged;
(2) two nuts with the diameter of 15mm are welded on the contact surface of the water stop screw and the concrete, so that the thickness of the concrete plate can be controlled, and the problem of rib leakage of the concrete can be prevented;
(3) before welding the nuts, whether the distance between the two nuts is 100mm or not must be checked, and the allowable deviation is (-5, + 8) mm;
(4) when the box type mould is disassembled, because the opposite tension rod in the concrete is not disassembled, the water stop steel plate is added on the opposite tension rod to prevent the concrete top plate from leaking water;
seventhly, designing and constructing the box type mold, wherein the operation mode is as follows:
(1) the material is selected, the template is a bamboo plywood with the thickness of 12mm and the specification is 1800X900X12mm, the inner vertical edges and the arc are respectively 35 × 70mm square wood and phi 48 × 3.0.0 mm steel pipes, and the wood template is an environment-friendly release agent;
(2) designing a template and pouring construction; the box type die is provided with an arc-shaped bottom plate system, an arc-shaped cover plate system and a water stop screw rod which are connected; the arc bottom plate system is the same as the arc cover plate system and consists of an arc bamboo plywood, a batten and an arc steel pipe; the box-type moulds are connected through a counter-pulling water-stopping screw rod; the box type moulds are installed from bottom to top from two sides of a dome, each box type mould is generally provided with a reserved concrete pouring opening with the width of 300mm at the radian direction interval of 900mm along the depth of the dome, so that a vibrating rod can be quickly inserted into a concrete template to finish vibrating work during concrete pouring, the concrete compactness is ensured, and after the concrete pouring of the box type moulds is finished, the reserved holes are poured and blocked, so that the box type moulds are sequentially constructed until the topmost end of the dome; the ninth construction section is gentle in gradient and is designed according to a top plate template, and only a bottom die is erected;
(3) and symmetrically pouring the two sides of the concrete when pouring, wherein the concrete slump at the sealing position is smaller, sealing by using a shaping cover plate, uniformly blanking the shaping cover plate according to the size of the opening in advance for construction, pouring the concrete at the pouring opening, and closing the pouring opening by using an iron mold within a 2mm direction.
The invention has the following technical effects: the concrete cushion is adopted, so that the cost is low, the workload is low, and the concrete cushion is not influenced when meeting water; the wheel buckle type mould frame is adopted, the joint connection is simple, the construction speed is high, and the cost is lower; the steel pipe is used as the arc keel, so that the single-meter weight is light, the inertia moment is large, the elastic modulus is large, the stress is good, and the steel pipe can be simultaneously operated, constructed and produced in a sizing way; the angle steel support is adopted, so that the anti-sliding performance is good, the force transmission of the keel is reliable, the construction efficiency is high, and the connecting piece can be rotated; the secondary keel device is stacked and horizontally placed, so that the stability is good, the secondary keel device can be effectively connected with a panel, the construction speed is high, compared with the equal-section vertical placement, the connection stress surface with a template is large, nails are easy to fix, and the appearance and the impression of later-stage concrete are good; the plate thickness controller utilizes the screw cap to adjust the height, has the effects of water stopping and plate thickness control, has good water stopping and protecting layer effects, and is convenient and rapid to construct; the box type mould is made of bamboo plywood, so that the economical efficiency is good, the joint connection is simple and reliable, the influence by the environment is small, the water absorption is good, the bending is easy, the manufacturing cost is low, and the service life is long.
Drawings
FIG. 1 is a view illustrating a concrete pad foundation treatment in an example;
FIG. 2 is an elevation view of an embodiment dome form;
figure 3 is a drawing of a primary and secondary keel connection system in an embodiment;
FIG. 4 shows a flat stack of cross runners of an embodiment;
FIG. 5 is a design view of a panel thickness controller according to an embodiment;
FIG. 6 is a design drawing of a box type mold in the embodiment;
FIG. 7 is a schematic drawing of a drawing process of a dome arc keel in an embodiment;
fig. 8 is a concrete pouring sequence diagram of the dome box mold in the embodiment.
Reference numerals: 1. a concrete cushion; 2. pseudo-ginseng gray soil; 3. backfilling plain soil; 4. self-tapping screw with alloy head; 5. angle steel; 6. a steel pipe; 7. bamboo plywood; 8. a water stop steel plate; 9. a nut; 10. pouring concrete; 11. an arc-shaped steel pipe keel; 12. and (5) stopping the water screw rod.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Examples
As shown in fig. 1-8, a large-span dome supports a keel formwork connection system, which comprises a support system, a keel system and a panel system; the supporting system comprises a concrete cushion layer 1 and a wheel buckle type formwork; the keel system comprises an arc-shaped main keel and a secondary keel; the panel system includes a panel thickness controller and a bamboo plywood mold for concrete placement.
The connection part of the arc main keel and the secondary keel is provided with a L50 angle steel connecting component, the angle steel and the arc main keel are vertically and fixedly connected by using an alloy head self-tapping screw, the plate thickness controller comprises a water stop screw 12, the water stop screw 12 is arranged in a quincunx shape, and a nut 9 is welded and fixed at the connection position of the water stop screw 12 and the inner side and the outer side of the template.
The foundation treatment comprises 500-thick pseudo-ginseng gray soil 2, 200mmC15 concrete cushion 1 and plain soil backfill 3. And (3) grinding the pseudo-ginseng gray soil 2 into three layers, sampling by a cutting ring after each layer of construction is finished, performing the next layer of construction after the layer of construction is qualified, and pouring concrete once.
The supporting system is a wheel buckle type scaffold support, the vertical rods are longitudinally and transversely spaced by 0.9m, and a U-shaped jacking is arranged at the top of each vertical rod; a vertical and horizontal floor sweeping rod is arranged at a position 0.35m away from the ground, a first vertical and horizontal large cross rod is arranged at an upward 1.2m distance for connection, vertical and horizontal large cross rods are arranged at the upper part at intervals of 1.2m for connection, and vertical and horizontal large cross rods are arranged at an elevation position 19.6m at intervals of 600mm for connection.
The installation process is as follows: pouring a concrete cushion layer → placing a formwork and a keel, processing and manufacturing → measuring and paying off the formwork → arranging and erecting the formwork and an outer frame upright rod → correcting the verticality of the upright rod → positioning a main keel at the bottom of a plate → fixedly installing a plate formwork → installing a plate thickness limiter → sequentially installing and reinforcing an arc-shaped beam plate top cover plate from bottom to top → symmetrically pouring a first section of concrete → plugging and reinforcing a pouring opening → nine sections in sequence.
A construction method of a large-span dome support keel formwork connecting system comprises the following steps:
the method comprises the following steps of firstly, controlling the flatness of a concrete cushion layer, and operating in the following mode:
(1) before the construction of the concrete cushion, firstly making ash cakes on the ground, wherein the longitudinal and transverse intervals of the ash cakes are 2m, and controlling the ash cakes to be super-flat by using a level gauge;
(2) popping up 500mm control lines on concrete columns and brick walls around the pouring area in advance, and performing technical bottom crossing on workers;
(3) when concrete is poured, the flatness of the cushion layer is controlled by using pull wires;
and secondly, detecting and controlling the model in the following operation mode:
(1) when a layer of the die carrier is built, a specially-assigned person is sent to the project department as a detection control point, and original data is recorded;
(2) after the construction of the die carrier is carried out for each time of load setting, a specially-assigned person is sent to monitor until the die carrier is removed;
thirdly, processing the arc-shaped steel pipe in the following operation mode:
(1) carrying out on-site lofting according to an arc-shaped large sample calculated by CAD software in advance, popping up the line size of a longitudinal and transverse main control line on the on-site concrete ground, popping up small lines, nailing a steel nail on each small node, drawing a dome arc line by utilizing a 14# iron wire to be attached to the steel nail, sequentially drawing the dome arc-shaped large sample line according to the thickness of a template, the height of a secondary keel and the section of a main keel, and finally popping out a beam and an outer contour line of a beam template to calculate the size of an arc-shaped steel pipe;
(2) the reinforcing steel bar heads with the length of 250mm and the diameter of 12mm are driven into the concrete to be 150mm deep at the interval of 300mm on the two sides of the inner line and the outer line of the main keel steel pipes, and the steel pipes leased in advance to be of the corresponding length are bent to form a first arc-shaped steel pipe as a comparison template according to the size of a CAD big sample;
(3) placing other steel pipes into hydraulic steel pipe bender equipment, slowly bending and forming the steel pipes from one end to the other end by using a physical method, measuring the linear dimensions of the two ends of the arc-shaped steel pipe by using a box ruler after bending and forming, and ensuring that the linear dimensions of the two ends of the arc-shaped steel pipe are consistent with the chord length of a large sample on a drawing;
(4) if the radian cannot meet the requirement, correcting by using simple bending equipment;
step four, the arc keel is connected with the secondary keel, and the operation mode is as follows:
(1) because the arc steel pipe keel 11 is unstable and easy to slide when being connected with the secondary keel, L50 angle steel 5 connecting components are additionally arranged at the connecting part of the main keel and the secondary keel;
(2) marking the center position of the secondary keel on a pre-placed arc ink line big sample, wherein the distance between the secondary keels is 200mm, and the secondary keel is arranged perpendicular to the arc keel;
(3) placing the end part of the arc-shaped steel pipe and the arc-shaped ink line correspondingly, aligning the ink line mark position by using a mark pen, and sequentially marking the center position of the secondary keel on the steel pipe;
(4) cutting the angle steel into 10cm sections, and vertically and fixedly connecting the angle steel 5 with the arc keel by using a 15mm flat head alloy head self-tapping screw 4;
(5) after the angle steels 5 are fixedly installed, whether the distance positions of the angle steels 5 are accurate or not is checked, and after the angle steels are determined to be correct, the back parts of the angle steels 5 are spot-welded with the arc-shaped steel pipes 6, so that the angle steels 5 and the steel pipes 6 are ensured to be firmly connected;
fifthly, installing a crotch type formwork in the following operation mode:
(1) the dome template support adopts a wheel buckle type full hall scaffold, the distance between vertical rods is 900mm × 900mm, the horizontal rod distribution distance is encrypted at the section from elevation 19.00m to elevation 26.7m, and the distance is 0.6 m;
(2) small cross bars and inclined support bars are additionally arranged at the positions, close to the dome, of the elevations of 21.0-26.7m to reinforce the arc-shaped main keels, the small cross bars are connected with at least two upright rods of the full hall frame, and the arc-shaped main keel steel pipes are easy to slide relative to the upright rods, so that the main keel steel pipes are usually pulled by one pull rod, and the pull rods and the transverse horizontal rods are pulled by fasteners;
(3) because the thickness of the arc-shaped plate must be reduced, in order to prevent the arc-shaped steel pipe from downwarping, a crotch-shaped inclined strut is additionally arranged between the two vertical rods, the inclined strut steel pipe and the vertical rods form an included angle of 45-60 degrees as much as possible, the inclined strut is vertically tangent to the side line of the arc-shaped steel pipe, the die carrier system is ensured to be relatively stable, and vertical shearing force is transmitted to the vertical rods through the inclined strut and the jackscrew;
(4) the inclined strut steel pipe is connected with the vertical rod and the horizontal rod by fasteners, and after the lowest end of the inclined strut steel pipe is connected with the vertical rod and the horizontal rod, a safety fastener is added to prevent the fasteners from sliding;
(5) after each fastener is installed, a torque wrench is required to check the torque value of the fastener, and the torque value of the fastener is ensured to be in place;
sixthly, manufacturing a plate thickness controller, wherein the operation mode is as follows:
(1) because the plate surface of the box type mould is easy to contact with the plate steel bar, the mould has two functions of controlling the thickness of the concrete plate and the thickness of the protective layer on the surface of the concrete when being arranged;
(2) two 15mm screw caps 9 are welded on the contact surface of the water stop screw 12 and the concrete, so that the thickness of the concrete plate can be controlled, and the problem of rib leakage of the concrete can be prevented;
(3) before welding the nut 9, it must be checked whether the distance between the two nuts is 100mm, allowing a deviation of (-5, + 8) mm;
(4) when the box type mould is disassembled, because the opposite tension rod in the concrete is not disassembled, the water stop steel plate 8 is added on the opposite tension rod to prevent the concrete top plate from leaking water;
seventhly, designing and constructing the box type mold, wherein the operation mode is as follows:
(1) the material is selected, the template is a bamboo plywood with the thickness of 12mm and the specification is 1800X900X12mm, the inner vertical edges and the arc are respectively 35 × 70mm square wood and phi 48 × 3.0.0 mm steel pipes, and the wood template is an environment-friendly release agent;
(2) designing a template and pouring construction; the box type mould is provided with an arc-shaped bottom plate system, an arc-shaped cover plate system and a water stop screw 12 which are connected; the arc bottom plate system is the same as the arc cover plate system and consists of an arc bamboo plywood, a batten and an arc steel pipe; the box-type moulds are connected by a counter-pulling water-stopping screw 12; the box type moulds are installed from bottom to top from two sides of a dome, each box type mould is generally provided with a reserved 300mm wide concrete pouring opening 10 with the radian direction spacing of 900mm along the depth of the dome, so that a vibrating rod can be quickly inserted into a concrete template to complete vibrating work during concrete pouring, the compactness of concrete is ensured, and after the concrete pouring of the box type moulds is completed, the reserved openings are poured and blocked, so that the box type moulds are sequentially constructed until the topmost end of the dome; the ninth construction section is gentle in gradient and is designed according to a top plate template, and only a bottom die is erected;
(3) the two sides are symmetrically poured during pouring, the concrete slump at the sealing position is small, a shaping cover plate is used for sealing, the shaping cover plate is uniformly blanked and constructed in advance according to the size of the opening, the pouring opening is filled with concrete, an iron mold is used for closing the pouring opening, and the pouring opening is controlled within the 2mm direction;
the dome is of a curved arc-shaped thin-shell reinforced concrete structure, and the whole dome is of an arc-shaped structure from top to bottom; the inner side of the dome is oval, and the column beam plate is of an arc-shaped structure. The multi-angle positioning of the radian of the dome, because the change of the arc angle is large, how the arc keel is arranged in sections and fixedly connected must be considered in advance; accurate positioning of the arc is the guarantee of the construction precision of the dome roof. Due to the fact that the dome is stressed complicatedly, the decomposition and combination of force and the force transmission direction must be considered, the fact that the mold frame supporting system corresponds to the force direction is guaranteed, and therefore unstable factors generated by multi-angle resultant force must be decomposed by the aid of the overall special-shaped mold frame at the position with the large radian of the mold frame.
Although only the preferred embodiments of the present invention have been described in detail, the present invention is not limited to the above embodiments, and various changes can be made without departing from the spirit of the present invention within the knowledge of those skilled in the art, and all changes are encompassed in the scope of the present invention.

Claims (5)

1. A large-span dome supports fossil fragments die carrier connected system, characterized by that, including braced system, keel system and panel system; the supporting system comprises a concrete cushion layer and a wheel buckle type formwork; the keel system comprises an arc-shaped main keel and a secondary keel; the panel system includes thick controller of board and the box mould that is used for concrete placement, and the box mould includes the template of bamboo offset plate material.
2. The large-span dome support keel formwork connecting system as claimed in claim 1, wherein angle steel is arranged at the joint of the arc-shaped main keel and the secondary keel, and the angle steel and the arc-shaped main keel are vertically and fixedly connected by using alloy head self-tapping screws.
3. The large-span dome supports fossil fragments die carrier connected system of claim 1, characterized in that, the board thickness controller includes the stagnant water screw rod, and the stagnant water screw rod is arranged in quincunx, and stagnant water screw rod and template inside and outside junction position welding fixation nut.
4. A construction method for a large-span dome support keel formwork connecting system is characterized by comprising the following steps:
the method comprises the following steps of firstly, controlling the flatness of a concrete cushion layer, and operating in the following mode:
(1) before the construction of the concrete cushion, firstly making ash cakes on the ground, wherein the longitudinal and transverse intervals of the ash cakes are 2m, and controlling the ash cakes to be super-flat by using a level gauge;
(2) popping up 500mm control lines on concrete columns and brick walls around the pouring area in advance, and performing technical bottom crossing on workers;
(3) when concrete is poured, the flatness of the cushion layer is controlled by using pull wires;
and secondly, detecting and controlling the model in the following operation mode:
(1) when a layer of the die carrier is built, a specially-assigned person is sent to the project department as a detection control point, and original data is recorded;
(2) after the construction of the die carrier is carried out for each time of load setting, a specially-assigned person is sent to monitor until the die carrier is removed;
thirdly, processing the arc-shaped steel pipe in the following operation mode:
(1) carrying out on-site lofting according to an arc-shaped large sample calculated by CAD software in advance, popping up the line size of a longitudinal and transverse main control line on the on-site concrete ground, popping up small lines, nailing a steel nail on each small node, drawing a dome arc line by utilizing a 14# iron wire to be attached to the steel nail, sequentially drawing the dome arc-shaped large sample line according to the thickness of a template, the height of a secondary keel and the section of a main keel, and finally popping out a beam and an outer contour line of a beam template to calculate the size of an arc-shaped steel pipe;
(2) the reinforcing steel bar heads with the length of 250mm and the diameter of 12mm are driven into the concrete at the distance of 300mm on the two sides of the inner line and the outer line of the main keel steel pipe for 150mm, and the steel pipe with the corresponding length is bent out of a first arc-shaped steel pipe according to the large CAD sample size to serve as a comparison template;
(3) placing other steel pipes into hydraulic steel pipe bender equipment, slowly bending and forming the steel pipes from one end to the other end by using a physical method, measuring the linear dimensions of the two ends of the arc-shaped steel pipe by using a box ruler after bending and forming, and ensuring that the linear dimensions of the two ends of the arc-shaped steel pipe are consistent with the chord length of a large sample on a drawing;
step four, the arc keel is connected with the secondary keel, and the operation mode is as follows:
(1) because the connection between the arc steel pipe keel and the secondary keel is unstable and easy to slide, angle steel is additionally arranged at the connection part of the main keel and the secondary keel;
(2) marking the center position of the secondary keel on a pre-placed arc ink line big sample, wherein the distance between the secondary keels is 200mm, and the secondary keel is arranged perpendicular to the arc keel;
(3) placing the end part of the arc-shaped steel pipe and the arc-shaped ink line correspondingly, aligning the ink line mark position by using a mark pen, and sequentially marking the center position of the secondary keel on the steel pipe;
(4) cutting the angle steel into small sections, and vertically and fixedly connecting the angle steel with the arc keel by using a flat-head alloy head self-tapping screw;
(5) after the angle steel is fixedly installed, checking whether the distance position of the angle steel is accurate, and performing spot welding on the back of the angle steel and the arc-shaped steel pipe after determining that the angle steel is correct, so as to ensure that the angle steel is firmly connected with the steel pipe;
fifthly, installing a crotch type formwork in the following operation mode:
(1) the dome template support adopts a wheel buckle type full scaffold;
(2) small cross bars and inclined support bars are additionally arranged at the positions close to the dome to reinforce the arc-shaped main keel, the small cross bars are connected with at least two vertical rods of the full hall frame, and because the arc-shaped main keel steel pipes are easy to slide relative to the vertical rods, the main keel steel pipes are usually pulled by one pull rod, and the pull rods and the transverse horizontal rods are pulled by fasteners;
(3) because the thickness of the arc-shaped plate must be reduced, in order to prevent the arc-shaped steel pipe from downwarping, a crotch-shaped inclined strut is additionally arranged between the two vertical rods, the inclined strut steel pipe and the vertical rods form an included angle of 45-60 degrees as much as possible, the inclined strut is vertically tangent to the side line of the arc-shaped steel pipe, the die carrier system is ensured to be relatively stable, and vertical shearing force is transmitted to the vertical rods through the inclined strut and the jackscrew;
(4) the inclined strut steel pipe is connected with the vertical rod and the horizontal rod by fasteners, and after the lowest end of the inclined strut steel pipe is connected with the vertical rod and the horizontal rod, a safety fastener is added to prevent the fasteners from sliding;
(5) after each fastener is installed, a torque wrench is required to check the torque value of the fastener, and the torque value of the fastener is ensured to be in place;
sixthly, manufacturing a plate thickness controller, wherein the operation mode is as follows:
(1) because the plate surface of the box type mould is easy to contact with the plate steel bar, the mould has two functions of controlling the thickness of the concrete plate and the thickness of the protective layer on the surface of the concrete when being arranged;
(2) two nuts are welded on the contact surface of the water stop screw and the concrete, so that the thickness of the concrete plate can be controlled, and the problem of rib leakage of the concrete can be prevented;
(3) when the box type mould is disassembled, because the opposite tension rod in the concrete is not disassembled, the water stop steel plate is added on the opposite tension rod to prevent the concrete top plate from leaking water;
seventhly, designing and constructing the box type mold, wherein the operation mode is as follows:
(1) selecting materials; the template is made of bamboo plywood, and the inner vertical ridge and the arc are made of square wood and a steel pipe respectively; the wood template adopts an environment-friendly release agent;
(2) designing a template and pouring construction; the box type die is provided with an arc-shaped bottom plate system, an arc-shaped cover plate system and a water stop screw rod which are connected; the arc bottom plate system is the same as the arc cover plate system and consists of an arc bamboo plywood, a batten and an arc steel pipe; the box-type moulds are connected through a counter-pulling water-stopping screw rod; the box type moulds are installed from bottom to top from two sides of a dome, each box type mould is generally provided with a reserved concrete pouring opening with the width of 300mm at the radian direction interval of 900mm along the depth of the dome, so that a vibrating rod can be quickly inserted into a concrete template to finish vibrating work during concrete pouring, the concrete compactness is ensured, and after the concrete pouring of the box type moulds is finished, the reserved holes are poured and blocked, so that the box type moulds are sequentially constructed until the topmost end of the dome; the ninth construction section is gentle in gradient and is designed according to a top plate template, and only a bottom die is erected;
(3) and symmetrically pouring the two sides of the concrete when pouring, wherein the concrete slump at the sealing position is smaller, sealing by using a shaping cover plate, uniformly blanking the shaping cover plate according to the size of the opening in advance for construction, pouring the concrete at the pouring opening, and closing the pouring opening by using an iron mold.
5. The construction method of the large-span dome supporting keel formwork connecting system according to claim 4, wherein in the fourth step, if the radian cannot meet the requirement, simple bending equipment is used for correction.
CN202010363743.0A 2020-04-30 2020-04-30 Large-span dome support keel formwork connecting system and construction method Withdrawn CN111441525A (en)

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