CN110700112A - Movable formwork for concrete construction of overhanging wing plate of steel-concrete composite beam and construction method - Google Patents
Movable formwork for concrete construction of overhanging wing plate of steel-concrete composite beam and construction method Download PDFInfo
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- CN110700112A CN110700112A CN201911055079.7A CN201911055079A CN110700112A CN 110700112 A CN110700112 A CN 110700112A CN 201911055079 A CN201911055079 A CN 201911055079A CN 110700112 A CN110700112 A CN 110700112A
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- 239000004567 concrete Substances 0.000 title claims abstract description 88
- 238000010276 construction Methods 0.000 title claims abstract description 72
- 239000002131 composite material Substances 0.000 title claims abstract description 28
- 238000009415 formwork Methods 0.000 title claims abstract description 27
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 82
- 239000010959 steel Substances 0.000 claims abstract description 82
- 238000003466 welding Methods 0.000 claims description 14
- 239000000725 suspension Substances 0.000 claims description 13
- 239000000463 material Substances 0.000 claims description 10
- 238000000034 method Methods 0.000 claims description 10
- 230000007306 turnover Effects 0.000 claims description 5
- 239000011440 grout Substances 0.000 claims description 4
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 3
- 238000004140 cleaning Methods 0.000 claims description 3
- 238000005520 cutting process Methods 0.000 claims description 3
- 238000012423 maintenance Methods 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000005507 spraying Methods 0.000 claims description 3
- 238000003860 storage Methods 0.000 claims description 3
- 238000009432 framing Methods 0.000 description 6
- 238000009826 distribution Methods 0.000 description 3
- 239000011150 reinforced concrete Substances 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 230000001174 ascending effect Effects 0.000 description 1
- 238000009435 building construction Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- XEEYBQQBJWHFJM-UHFFFAOYSA-N iron Substances [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 229910052742 iron Inorganic materials 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 238000004904 shortening Methods 0.000 description 1
- 238000012876 topography Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/12—Grating or flooring for bridges; Fastening railway sleepers or tracks to bridges
- E01D19/125—Grating or flooring for bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
- E01D2/04—Bridges characterised by the cross-section of their bearing spanning structure of the box-girder type
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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
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
- E01D2101/26—Concrete reinforced
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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
- E01D2101/00—Material constitution of bridges
- E01D2101/30—Metal
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- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention relates to a movable formwork for concrete construction of a steel-concrete composite beam overhanging wing plate, which is characterized in that a plurality of symmetrical support columns are arranged on a steel box beam flange plate, a plurality of cross beams are arranged on the corresponding support columns, an outer side suspender and an inner side suspender are respectively arranged at two ends of each cross beam, the lower parts of the outer side suspender and the inner side suspender are suspended and connected with the inner edge and the outer edge of a stiffening template, and the inner edge of the stiffening template is fixedly connected with the edges of the wing flange plates at two sides of the steel box beam in a clamping manner. The invention can realize the pouring mould frame at the overhanging wing plate of the superposed beam without erecting a full support or a triangular diagonal bracing support at the side surface of the steel box beam, and the overhanging concrete panel has no groove; and the whole die carrier can move longitudinally, and the die carrier is transferred to the next pouring working section on the premise of not dismantling the die carrier structure, so that the construction efficiency is greatly improved, the die carrier can be recycled after construction, and the construction cost is saved.
Description
Technical Field
The invention relates to the field of building construction, in particular to a movable formwork and a construction method for concrete construction of a cantilever wing plate of a steel-concrete composite beam, which are suitable for concrete pouring construction of a wing plate of a steel-concrete composite beam bridge with large span and height or other concrete cantilever construction of buildings.
Background
The steel-concrete composite beam is widely applied to urban bridges as a bridge structure form. The steel structure and concrete combined stress girder is characterized in that the girder is a girder body with a steel structure or a steel box structure, and a panel is made of concrete; the two bear the load of the bridge deck together, and the dead weight of the bridge can be greatly reduced. The structure enables the reinforced concrete slab and the steel box girder to be jointly bent under the action of vertical load through the shear key, the pressure area borne by the upper edge of the steel box girder is greatly reduced, the stress characteristics of the steel bars and the concrete are fully exerted, the reinforced concrete slab and the steel box girder are combined into a whole, the section rigidity is increased, and therefore the steel consumption can be reduced. Meanwhile, due to the construction characteristics of the steel structure, the upper and lower structures of the bridge can be constructed simultaneously, and the construction progress is accelerated. Steel-mixed composite girders are therefore increasingly used in urban and highway construction.
The overhanging wing plate part of the concrete bridge deck of the steel-concrete composite beam mainly adopts a full framing method and a steel box beam side triangular diagonal bracing framing method in the traditional pouring construction. Because the pterygoid lamina part of encorbelmenting is small, and the bridge floor is higher apart from ground height, and the span is great, and the full framing method once sets up needs the transportation, installation, demolising of a large amount of materials, and construction cost and human cost are very high, and construction safety risk is very big, and full very long all around of full framing method frame, are unfavorable for accelerating the construction progress of engineering.
The steel box girder side triangular diagonal bracing support method is the most common construction method at present, and the method needs to weld more connecting pieces on the side of the steel box girder and has permanent influence on the appearance and the structure of the steel box girder to a certain extent; in addition, the temporary ladder frame is required to be erected to the armpit of the wing plate for construction operation in the mounting and dismounting of the support, the safety risk of the operation is increased progressively along with the height of the temporary ladder frame, the frequent dismounting cost of the ladder frame is higher, the flexibility is poor, and the construction period is longer.
The searched published documents about the formwork support at the overhanging position of the steel-concrete composite beam are as follows:
1. steel-concrete composite beam flange plate construction gallows, application number: CN 201721762102.2; the applicant: second engineering, Inc. of Zhongjiao-II voyage; sixteen office group road and bridge engineering limited for medium-iron; and (3) abstract: the steel-concrete composite beam flange plate construction hanging bracket comprises a plurality of supporting structures and a template system, wherein the supporting structures are arranged along the outer side of a box girder web plate at vertical uniform intervals, each supporting structure comprises a bottom joist, a supporting frame and hanging rods, at least two vertical hanging rods are fixed between the cantilever rods and the bottom joists, the template system comprises a plurality of distribution beams and a plurality of bent frames, the distribution beams are arranged on the bottom joist at vertical intervals, and the bent frames are arranged on the distribution beams at horizontal uniform intervals. The utility model has the advantages of stable in structure, with low costs, time limit for a project are short to not receive the influence of underbridge traffic conditions and topography in installation and the use, solved and striden the difficult problem that existing road bracket set up, reduced the construction procedure, improved the efficiency of construction.
As can be known from published documents, the flange plate construction hanger in the prior art needs to uniformly arrange a support structure on the whole length of a box girder flange, and still has the disadvantages of long construction period and high construction cost.
Disclosure of Invention
The invention provides a movable suspension formwork for cast-in-place construction of reinforced concrete composite beam wing plate concrete and a construction method thereof; the structure can realize the pouring mould frame at the overhanging wing plate of the superposed beam without erecting a full support or a triangular diagonal bracing support at the side surface of the steel box beam, and the overhanging concrete panel has no groove; and the whole die carrier can move longitudinally, and the die carrier is transferred to the next pouring working section on the premise of not dismantling the die carrier structure, so that the construction efficiency is greatly improved, the die carrier can be recycled after construction, and the construction cost is saved.
In order to achieve the purpose of the invention, the technical scheme is as follows:
steel-concrete composite beam encorbelments aerofoil concrete construction and uses moving die carrier structure, the structure is for setting up the support column of the mutual symmetry of a plurality of on steel box girder flange board, installs a plurality of crossbeams on the support column that corresponds, and outside jib and inboard jib are installed respectively to the crossbeam both ends, and outside jib and inboard jib below suspend in midair the interior outer fringe of connecting the template of putting more energy into, and the inward flange of the template of putting more energy into and the marginal chucking fixed connection of steel box girder both sides flange board.
The stiffening template is suspended on two sides of the flange plate of the steel box girder in a suspending way and is clamped and connected, so that a symmetrical and stable integral structure is formed to bear the load of the cantilever flange plate concrete construction. The overhanging part of the concrete panel is solidified and formed on the stiffening template, the weight of the concrete is transmitted to the beam by the outer suspender and the inner suspender, and the pressure is transmitted to the supporting column by the beam, thereby avoiding the complicated construction and structure of the traditional full-framing method and the steel box girder side triangular inclined strut support method.
The structure sets up die carrier traveling system, and die carrier traveling system includes: the longitudinal beam is fixed below the cross beam, the longitudinal beam and the cross beam form an integral frame, and the longitudinal beam is arranged above the flange plate of the steel box girder; a plurality of pulleys are arranged below the longitudinal beam, and the lower sides of the pulleys are aligned with the track;
there are two situations for the position of the track: in the first case, the rails are fixed to the concrete panels already cast; in the second case, the rail is fixed to the steel box girder flange plate without the concrete panel poured, and the pulley is connected to the rail through the pulley leg.
The section steel track is divided into four sections conventionally and is correspondingly arranged below the four pulleys respectively. The front wheel track is laid on the flange plate of the steel box girder, the rear wheel track is laid on the poured concrete, and the function of walking the whole formwork on the bridge deck with two different heights of the poured concrete and the un-poured concrete is realized through two groups of walking pulleys with different heights; the lengthening design of the two ends of the I-shaped steel longitudinal beam can enable the integral formwork traveling system to keep the front pulley in the top surface of the steel box girder all the time, and the rear pulley is in the state of traveling on the top surface of the poured concrete.
The inner edge of the stiffening template is provided with a triangular clamping strip, the edge parts of the flange plates on two sides of the corresponding steel box girder are provided with die assembly limiting clamping grooves, and the die assembly limiting clamping grooves are mutually hooked and fixed.
The die assembly limiting clamping groove is formed by welding two steel plates at an angle, one steel plate is welded at the edge of the upper flange plate of the steel box girder, the other steel plate is obliquely picked to form a clamping groove with a downward opening, the obliquely picked steel plate is perpendicular to the groove opening and the center connecting line of the lifting ring, and the groove opening is triangular.
A grout stopping strip is attached to the inner side of the notch of the die closing limiting clamping groove; the grout stopping strip is made of rubber materials, has good shaping and elasticity, and can prevent concrete leakage. The design of the die assembly limiting clamping groove ensures that the die assembly concreting is not leaked under the tightening state of the inner suspender, the suspended stiffening template is limited to swing in the horizontal direction during construction, and the stiffening template rotates around the lifting ring and the lifting ring when the demolding is not hindered.
The upper part of the outer suspender passes through an outer suspender hole preset by the cross beam, and an outer adjusting nut is screwed at the part where the outer suspender passes through for limiting; the lower part of the outer suspender is provided with a hanging ring which penetrates through a hanging hole preset in the stiffening template.
The strength template can freely rotate around the hanging ring; the outer suspender can realize the height adjustment of the tail end of the stiffening template, and ensure the correct pouring position of the wing plate; the outer side suspender can realize that the stiffening formwork is convenient to be separated from a concrete surface (demoulding) after concrete pouring in a hanging ring hinging mode, and does not separate from a formwork system.
The upper part of the inner suspender passes through an inner suspender hole A preset by the cross beam, and an inner adjusting nut is screwed on the part where the inner suspender passes through for limiting; the lower part of the inner suspender passes through an inner suspender hole B preset by the stiffening template, and a lower fixing nut is arranged at the penetrating part for limiting; the part of the lower fixing nut, which is contacted with the stiffening template, is provided with a cushion block.
The uppermost end of the inner suspender is also provided with an upper fixing nut for limiting and protecting the inner adjusting nut.
The bottom of the cross beam is welded with a limiting lantern ring, and the limiting lantern ring is sleeved on the support column; the bolt passes through the preformed holes on the limiting lantern ring and the supporting column. The cross beam is welded by double splicing of I-shaped steel or channel steel; welding a limiting lantern ring at the bottom corresponding to the position of the support column, wherein the limiting lantern ring is made of a steel pipe with the diameter slightly larger than that of the support column;
and the PVC pipe is sleeved outside the inner suspender and used for isolating concrete.
3 angle steel stiffening ribs are longitudinally welded on the stiffening template, and one angle steel stiffening rib is transversely welded every 50 cm.
The construction method of the movable formwork structure for the concrete construction of the cantilever wing plate of the steel-concrete composite beam comprises the following steps of:
(1) after the parts are preprocessed according to drawings, all the prefabricated parts are transported to the site, and steel pipe supporting columns are installed at the tops of flange plates on the steel box girders according to design positions;
(2) welding steel pipe support columns on the tops of the upper flange plates of the steel box girders according to the designed positions, and welding mould-closing limiting clamping grooves on the edges of the upper flange plates of the steel box girders;
(3) welding a cross beam and a longitudinal beam into a whole at a ground leveling position or on a steel box girder, mounting a pulley below the longitudinal beam, mounting an outer suspension rod and an inner suspension rod at two ends of the cross beam, mounting a stiffening template on suspension rings of the outer suspension rods, hoisting the whole formwork, butting a limiting lantern ring with a corresponding support column, and mounting a bolt;
(4) drawing the stiffening template to enable the triangular clamping strip to be embedded into the die assembly limiting clamping groove, connecting the inner side suspender with the stiffening template, and carrying out primary die assembly;
(5) measuring and checking the height of the outer side of the stiffening template, adjusting the height to a designed height through an outer adjusting nut, and tightening an inner adjusting nut to complete die assembly;
(6) and (4) installing bridge deck reinforcing steel bars, cleaning sundries in the template, spraying a release agent, and pouring concrete.
(7) After the concrete is cured to reach the strength, unscrewing the inner adjusting nut, rotating the upper fixing nut, dismantling the inner suspender, and using the dead weight of the stiffening template to enable the stiffening template to rotate around the lifting ring, so that the stiffening template is separated from the concrete surface, and demolding is completed;
(8) removing the bolts on the limiting ring sleeves, jacking the whole die carrier at two ends of the longitudinal beam by using four jacks, laying a profile steel track below the pulleys, unloading the jacks to enable the pulleys to fall on the track, and drawing and walking to a next pouring section;
(9) after the trolley is in place, jacking the whole support at two ends of the longitudinal beam by using four jacks, removing the lower rail of the pulley, and dropping the whole support on the supporting column;
(10) the general pouring from the step (3) to the step (9) to the full-bridge is repeated;
(11) after the strength of the concrete meets the requirement, sequentially removing the stiffening template, the suspender, the cross beam and the longitudinal beam; cutting the support columns of the concrete surface at the exposed part to finish the construction of the upper bridge deck; and the disassembled parts are transported to the next construction site for use or transported back to a material turnover warehouse for maintenance and storage.
Compared with the prior art, the invention has the substantive characteristics and the progress that:
1. the invention overcomes the defects of the traditional full framing and steel box girder side inclined strut support in the pouring formwork at the overhanging wing plate of the superposed beam, is quick and convenient to install during construction, is combined with the lifting of the jack, and moves the whole formwork on the track through the pulley, thereby improving the construction efficiency and shortening the construction period.
2. On traditional clamp mould construction basis, set up spacing draw-in groove and card strip in template binding position, effectively prevent concrete construction and leak thick liquid, and effectively prevent to hang the ascending swing of die carrier horizontal direction through the inlay card, increased stability, the sound construction.
3. The invention adopts all the operations of die assembly and die disassembly to be carried out on the upper part of the bridge, and the construction is safe.
4. The longitudinal beams, the cross beams, the stiffening templates and other materials used in the invention are all made of profile steel, the material sources are wide, the standardized manufacturing can be realized, the centralized processing in factories can be realized, the welding quality can be fully ensured, and the standardization degree is high.
5. According to the invention, the upper lifting ring is connected with the template, so that the template can freely rotate around the lifting ring, and the top support mode is matched with the self weight of the template, so that the demoulding can be easily realized.
Drawings
FIG. 1 is a schematic view of the overall appearance structure of the present invention;
FIG. 2 is a schematic view of the structure of the present invention in a front view direction;
FIG. 3 is a schematic view of a cross member according to the present invention;
FIG. 4 is an enlarged view of a portion of FIG. 2 at I;
FIG. 5 is a schematic view of a support column;
FIG. 6 is a schematic structural view of a mold frame walking system;
1. a support pillar; 2. a cross beam; 23. a limiting lantern ring; 24. a bolt; 3. an outer boom; 31 an external adjusting nut; 32 hoisting rings; 4. an inboard boom; 41. an inner adjusting nut; 42. a lower fixing nut; 43. cushion blocks; 44. an upper fixing nut; 5. stiffening the template; 51. a triangular clamping strip; b; 6. a stringer; 7. a steel box girder flange; 71. a die assembly limiting clamping groove; 8. a track; 9. a pulley; 10. and (4) supporting legs of the pulley.
Detailed Description
The present invention is described in further detail with reference to the accompanying fig. 1-6 of the present invention; the drawing shows a double box girder structure, but it should be noted that the formwork structure and the construction method of the present invention are also applicable to a single box girder or a plurality of box girders.
Steel concrete composite beam encorbelments aerofoil for concrete construction moving die carrier, the structure is for setting up a plurality of support column 1 of mutual symmetry on steel box girder flange board 7, installs a plurality of crossbeams 2 on the support column 1 that corresponds, and outside jib 3 and inboard jib 4 are installed respectively to 2 both ends of crossbeam, and the inside and outside edge of connecting stiffening template 5 is suspended in midair to outside jib 3 and inboard jib 4 below, and stiffening template 5's inward flange and steel box girder both sides flange board 7's edge chucking fixed connection.
The structure sets up die carrier traveling system, and die carrier traveling system includes: the longitudinal beam 6 is fixed below the cross beam 2, the longitudinal beam 6 and the cross beam 2 form an integral frame, and the longitudinal beam 6 is arranged above a flange plate 7 of the steel box girder; a plurality of pulleys 9 are arranged below the longitudinal beam 6, and the lower part of each pulley 9 is aligned with the corresponding track 8; the I-shaped steel longitudinal beam 28 is 13m long, and each end of the I-shaped steel longitudinal beam extends 50cm out of the working surface. The pulley (29) is arranged at the position 25cm away from the end part of the longitudinal beam, and the pulley is arranged at the position 25cm away from the end part of the longitudinal beam;
there are two situations for the position of the track 10: in the first case, the rails 8 are fixed to the concrete panels already cast; in the second case, the rail 8 is fixed to the steel box girder flange 7 without concrete slab poured, and the pulley 9 is connected to the rail 8 by means of the pulley leg 10.
The inner edge of the stiffening template 5 is provided with a triangular clamping strip 51, the edge parts of the flange plates 7 on two sides of the corresponding steel box girder are provided with a die assembly limiting clamping groove 71, and the die assembly limiting clamping groove 71 and the die assembly limiting clamping groove are mutually hooked and fixed.
And a grout stopping strip is attached to the inner side of the notch of the die closing limiting clamping groove 71.
The upper part of the outer suspender 3 passes through an outer suspender hole preset in the cross beam 2, and an outer adjusting nut 31 is screwed at the part where the outer suspender 3 passes through for limiting; the lower part of the outer side suspender 3 is provided with a hanging ring 32, and the hanging ring 32 penetrates through a hanging hole preset in the stiffening template 5.
The upper part of the inner suspender 4 passes through an inner suspender hole A preset by the cross beam 2, and an inner adjusting nut 41 is screwed on the part where the inner suspender 4 passes through for limiting; the lower part of the inner suspender 4 passes through an inner suspender hole B preset in the stiffening template 5, and a lower fixing nut 42 is arranged at the penetrating part for limiting; the cushion block 43 is arranged at the contact part of the lower fixing nut 42 and the stiffening template 5.
The bottom of the cross beam 2 is welded with a limiting lantern ring 23, and the limiting lantern ring 23 is sleeved on the support column 1; the bolt 24 passes through the stop collar 23 and the preformed hole on the support column 1.
And a pvc pipe is sleeved outside the inner suspender 4 and used for isolating concrete.
3 angle steel stiffening ribs are longitudinally welded on the stiffening template 5, and one angle steel stiffening rib is transversely welded every 50 cm.
The construction method of the movable formwork structure for the concrete construction of the cantilever wing plate of the steel-concrete composite beam comprises the following steps of:
(1) after the parts are preprocessed according to drawings, all the prefabricated parts are transported to the site, and steel pipe supporting columns are installed at the tops of flange plates on the steel box girders according to design positions;
(2) welding steel pipe support columns on the tops of the upper flange plates of the steel box girders according to the designed positions, and welding mould-closing limiting clamping grooves on the edges of the upper flange plates of the steel box girders;
(3) welding a cross beam and a longitudinal beam into a whole at a ground leveling position or on a steel box girder, mounting a pulley below the longitudinal beam, mounting an outer suspension rod and an inner suspension rod at two ends of the cross beam, mounting a stiffening template on suspension rings of the outer suspension rods, hoisting the whole formwork, butting a limiting lantern ring with a corresponding support column, and mounting a bolt;
(4) drawing the stiffening template to enable the triangular clamping strip to be embedded into the die assembly limiting clamping groove, connecting the inner side suspender with the stiffening template, and carrying out primary die assembly;
(5) measuring and checking the height of the outer side of the stiffening template, adjusting the height to a designed height through an outer adjusting nut, and tightening an inner adjusting nut to complete die assembly;
(6) and (4) installing bridge deck reinforcing steel bars, cleaning sundries in the template, spraying a release agent, and pouring concrete.
(7) After the concrete is cured to reach the strength, unscrewing the inner adjusting nut, rotating the upper fixing nut, dismantling the inner suspender, and using the dead weight of the stiffening template to enable the stiffening template to rotate around the lifting ring, so that the stiffening template is separated from the concrete surface, and demolding is completed;
(8) removing the bolts on the limiting ring sleeves, jacking the whole die carrier at two ends of the longitudinal beam by using four jacks, laying a profile steel track below the pulleys, unloading the jacks to enable the pulleys to fall on the track, and drawing and walking to a next pouring section;
(9) after the trolley is in place, jacking the whole support at two ends of the longitudinal beam by using four jacks, removing the lower rail of the pulley, and dropping the whole support on the supporting column;
(10) the general pouring from the step (3) to the step (9) to the full-bridge is repeated;
(11) after the strength of the concrete meets the requirement, sequentially removing the stiffening template, the suspender, the cross beam and the longitudinal beam; cutting the support columns of the concrete surface at the exposed part to finish the construction of the upper bridge deck; and the disassembled parts are transported to the next construction site for use or transported back to a material turnover warehouse for maintenance and storage.
Example 1:
the height of a bridge pier of a certain large bridge is 26m, the upper structure is a steel-mixed composite beam, and the width of a wing plate cantilever is 1.1 m. If adopt full hall support construction, need to trade to pack the processing to the support base, and the work load of setting up of support is very big, and the engineering time is long, and the security of operating personnel can't be guaranteed in the setting up of so high support, takes place the pole piece even personnel incident that drops easily. If adopt steel box girder side triangle bracing, then need be at a large amount of connecting pieces of steel box girder surface welding, can become permanent influence to steel box girder outward appearance and knot structure, and the workman need set up interim support and carry out the support and press and demolish the construction to the pterygoid lamina armpit, hardly guarantee on-the-spot welding operation condition, cause great hidden danger to safety and quality. The invention saves manpower and turnover materials, shortens construction period, greatly reduces cost, has good concrete quality and high safety performance, and does not generate quality and safety accidents.
Example 2:
the height of a bridge pier of a certain large bridge is 34m, the upper structure is a steel-mixed composite beam, and the width of a wing plate cantilever is 1.29 m. According to the practice and experience of case 1, the material turnover in case 1 is used, so that a large amount of labor and materials are saved, the cost is greatly reduced, and the construction period is shortened. By adopting the invention, the concrete has good quality and high safety performance, and no quality and safety accidents occur.
Claims (10)
1. Steel-concrete composite beam encorbelments aerofoil movable mould frame for concrete construction, its characterized in that: the structure is that the support column (1) of setting up the mutual symmetry of a plurality of on steel box girder flange board (7), install a plurality of crossbeams (2) on support column (1) that correspond, outside jib (3) and inboard jib (4) are installed respectively to crossbeam (2) both ends, and the inside and outside edge of connecting stiffening template (5) is suspended in midair to outside jib (3) and inboard jib (4) below, and the inward flange of stiffening template (5) and the marginal chucking fixed connection of steel box girder both sides flange board (7).
2. The moving formwork for concrete construction of the cantilever wing plate of the steel-concrete composite beam according to claim 1, wherein: the structure sets up die carrier traveling system, and die carrier traveling system includes: the longitudinal beam (6) is fixed below the cross beam (2), the longitudinal beam (6) and the cross beam (2) form an integral frame, and the longitudinal beam (6) is arranged above a flange plate (7) of the steel box girder; a plurality of pulleys (9) are arranged below the longitudinal beam (6), and the lower part of each pulley (9) is aligned to the track (8);
there are two situations for the position of the rail (10): in the first case, the rail (8) is fixed to the concrete panel already cast; in the second case, the rail (8) is fixed to the steel box girder flange plate (7) without the concrete panel poured, and the pulley (9) is connected to the rail (8) through the pulley leg (10).
3. The moving formwork for concrete construction of the cantilever wing plate of the steel-concrete composite beam according to claim 1, wherein: the inner edge of the stiffening template (5) is provided with a triangular clamping strip (51), the edge parts of the flange plates (7) on two sides of the corresponding steel box girder are provided with die-closing limiting clamping grooves (71), and the die-closing limiting clamping grooves are mutually hooked and fixed.
4. The moving formwork for concrete construction of the cantilever wing plate of the steel-concrete composite beam according to claim 3, wherein: and a grout stopping strip is attached to the inner side of the notch of the die closing limiting clamping groove (71).
5. The moving formwork for concrete construction of the cantilever wing plate of the steel-concrete composite beam according to claim 1, wherein: the upper part of the outer suspender (3) passes through an outer suspender hole preset in the cross beam (2), and an outer adjusting nut (31) is screwed at the part where the outer suspender (3) passes through for limiting; the lower part of the outer side suspender (3) is provided with a hanging ring (32), and the hanging ring (32) penetrates through a hanging hole preset in the stiffening template (5).
6. The moving formwork for concrete construction of the cantilever wing plate of the steel-concrete composite beam according to claim 1, wherein: the upper part of the inner suspender (4) passes through an inner suspender hole A preset by the cross beam (2), and an inner adjusting nut (41) is screwed on the part where the inner suspender (4) passes through for limiting; the lower part of the inner suspender (4) passes through an inner suspender hole B preset in the stiffening template (5), and a lower fixing nut (42) is arranged at the penetrating part for limiting; the part of the lower fixing nut (42) contacted with the stiffening template (5) is provided with a cushion block (43).
7. The moving formwork for concrete construction of the cantilever wing plate of the steel-concrete composite beam according to claim 1, wherein: the bottom of the cross beam (2) is welded with a limiting lantern ring (23), and the limiting lantern ring (23) is sleeved on the supporting column (1); the bolt (24) passes through the limit lantern ring (23) and a preformed hole on the support column (1).
8. The moving formwork for concrete construction of the cantilever wing plate of the steel-concrete composite beam according to claim 1, wherein: the inner side suspender (4) is externally sleeved with a pvc pipe for isolating concrete.
9. The moving formwork for concrete construction of the cantilever wing plate of the steel-concrete composite beam according to claim 1, wherein: 3 angle steel stiffening ribs are longitudinally welded on the stiffening template (5), and one angle steel stiffening rib is transversely welded every 50 cm.
10. The construction method of the movable formwork for the concrete construction of the cantilever wing plate of the steel-concrete composite beam is characterized in that: the method comprises the following steps:
(1) after the parts are preprocessed according to drawings, all the prefabricated parts are transported to the site, and steel pipe supporting columns are installed at the tops of flange plates on the steel box girders according to design positions;
(2) welding steel pipe support columns on the tops of the upper flange plates of the steel box girders according to the designed positions, and welding mould-closing limiting clamping grooves on the edges of the upper flange plates of the steel box girders;
(3) welding a cross beam and a longitudinal beam into a whole at a ground leveling position or on a steel box girder, mounting a pulley below the longitudinal beam, mounting an outer suspension rod and an inner suspension rod at two ends of the cross beam, mounting a stiffening template on suspension rings of the outer suspension rods, hoisting the whole formwork, butting a limiting lantern ring with a corresponding support column, and mounting a bolt;
(4) drawing the stiffening template to enable the triangular clamping strip to be embedded into the die assembly limiting clamping groove, connecting the inner side suspender with the stiffening template, and carrying out primary die assembly;
(5) measuring and checking the height of the outer side of the stiffening template, adjusting the height to a designed height through an outer adjusting nut, and tightening an inner adjusting nut to complete die assembly;
(6) installing bridge deck reinforcing steel bars, cleaning sundries in the template, spraying a release agent, and pouring concrete;
(7) after the concrete is cured to reach the strength, unscrewing the inner adjusting nut, rotating the upper fixing nut, dismantling the inner suspender, and using the dead weight of the stiffening template to enable the stiffening template to rotate around the lifting ring, so that the stiffening template is separated from the concrete surface, and demolding is completed;
(8) removing the bolts on the limiting ring sleeves, jacking the whole die carrier at two ends of the longitudinal beam by using four jacks, laying a profile steel track below the pulleys, unloading the jacks to enable the pulleys to fall on the track, and drawing and walking to a next pouring section;
(9) after the trolley is in place, jacking the whole support at two ends of the longitudinal beam by using four jacks, removing the lower rail of the pulley, and dropping the whole support on the supporting column;
(10) the general pouring from the step (3) to the step (9) to the full-bridge is repeated;
(11) after the strength of the concrete meets the requirement, sequentially removing the stiffening template, the suspender, the cross beam and the longitudinal beam; cutting the support columns of the concrete surface at the exposed part to finish the construction of the upper bridge deck; and the disassembled parts are transported to the next construction site for use or transported back to a material turnover warehouse for maintenance and storage.
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| CN110700112B (en) | 2024-09-13 |
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