CN110528402B - Construction method of ultra-wide box girder multi-truss-piece combined hanging basket - Google Patents
Construction method of ultra-wide box girder multi-truss-piece combined hanging basket Download PDFInfo
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- CN110528402B CN110528402B CN201910829367.7A CN201910829367A CN110528402B CN 110528402 B CN110528402 B CN 110528402B CN 201910829367 A CN201910829367 A CN 201910829367A CN 110528402 B CN110528402 B CN 110528402B
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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
- E01D21/10—Cantilevered erection
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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
- E01D21/10—Cantilevered erection
- E01D21/105—Balanced cantilevered erection
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Abstract
The invention relates to a construction method of an ultra-wide box girder multi-truss-piece combined hanging basket, which comprises a construction method of the ultra-wide box girder multi-truss-piece combined hanging basket, and comprises seven steps of assembly of a hanging basket, simulation load prepressing of B, positioning and template installation of C hanging basket, installation of D reinforcing steel bar, embedded part and prestress system, pouring and curing of E concrete, stretching and grouting of F, advancing of G hanging basket, and entering construction circulation of the next girder section; bending moment can be effectively distributed through the main longitudinal beams of the four main trusses, deformation is coordinated, and the requirement on the rigidity of the main beam is low; the hanging basket has simple structure, convenient and quick installation and low cost; the practicality is strong, and factor of safety is high, reduces the safe risk in the work progress.
Description
Technical Field
The invention relates to the field of hanging basket construction, in particular to a construction method of an ultra-wide box girder multi-truss-piece combined hanging basket.
Background
The hanging basket construction refers to the construction method of hanging baskets and sectional cantilever operation on site when a cantilever beam bridge is poured. It does not need to erect a support and does not use a large crane. Compared with other methods, the construction of the hanging basket has the advantages of light structure, simple and convenient splicing, no pressure, heavy weight and the like.
For the construction of an ultra-wide box girder (the width of which exceeds 30m) cantilever, when a section of an ultra-wide section of the cantilever is poured, if a conventional hanging basket is adopted for construction, a main girder of the hanging basket can meet the bearing requirement only by needing enough rigidity; the girder that rigidity is big is from great, and anchor point counter-force is great, and the security of its structure is little. And when the hanging basket cantilever with the ultra-wide section beam section is constructed, the beam section is too heavy, so that the buckling instability phenomenon is caused.
Therefore, a safe and efficient hanging basket cantilever pouring scheme is designed aiming at the multi-box ultra-wide beam, and the problem to be solved in the field is urgently needed.
Disclosure of Invention
In order to solve the problem that a construction method of an ultra-wide box girder is lacked in the prior art, the invention provides a construction method of an ultra-wide box girder multi-truss sheet combined hanging basket.
In order to achieve the purpose, the technical scheme adopted by the application is as follows:
a construction method of a multi-truss-slice combined hanging basket of an ultra-wide box girder comprises the following construction steps:
assembling a hanging basket:
firstly, installing a main truss, and symmetrically laying 4 tracks along the center of a 0-2 # poured main girder; respectively fixing 4 triangular trusses on a track, and temporarily anchoring the single main truss; the front upper cross beam is arranged at the front ends of the two triangular trusses positioned on the same side, and the two triangular trusses positioned on the same side are reinforced by the cross beam;
then dismantling a bracket bowl buckle frame part of a No. 0-2 cast main beam of the main beam, assembling a lower platform on a Bailey beam of the bracket and a distribution beam on the Bailey beam, sliding the lower platform in place by using a tackle pulley set, and anchoring the lower platform by using a front suspender, a rear suspender and a walking suspender;
b, simulating load preloading:
the pre-pressing loading is carried out according to the grade of 60%, 80%, 100% and 110% of the load borne by the hanging basket, and each grade of loading is symmetrical and balanced; recording deformation data before and after loading as an adjustment value of the vertical mold height of the hanging basket;
c hanging basket in place and template installation
4 triangular main trusses are pushed by 4 oil jacks of the same type in a back pressure mode; 4 main trusses are made to run in place in a counter-pressure mode, and the lower platform is lifted in place through screw jacks on the suspension rods; and the installation of a bottom die (comprising an inclined web plate bottom die and an anchor block bottom die), a middle box template, a side box inner die, a diaphragm beam template and an end template is completed on the lower platform;
d reinforcing steel bar, embedded part and prestressed system installation
The steel bars comprise two layers of steel bar meshes of a bottom plate inclined web plate, two layers of steel bar meshes of a diaphragm beam, two layers of straight web plate steel bar meshes, a solid section and anchor block steel bars, and two layers of steel bar meshes of a top plate; the steel bars are preferably mechanically connected, and half of the steel bar joints are distributed in a staggered manner; installing corrugated pipes in the steel bar mesh sheets of the transverse partition beams in sections, and penetrating steel strand bundles;
the embedded parts comprise hanging basket preformed hole embedded parts, hanging belt preformed hole embedded parts, hanging basket walkway embedded parts, cable laying walkway embedded parts, hanging cable embedded parts and construction measurement embedded parts;
e concrete pouring and curing
When the concrete is poured, the concrete is applied from the low to the high in sequence from the outer side to the middle; the top surface of the beam body is smoothed by using wood plastering slurry; spraying curing agent on the surface of the concrete, covering the heat-insulating layer, and curing for more than 7 days;
f, tensioning and grouting;
after the concrete strength reaches 90%, demolding and pre-stress tensioning are carried out in the sequence from the longitudinal direction to the transverse direction; and (5) grouting and sealing the end after tensioning is finished.
G, the hanging basket moves forwards and enters the construction cycle of the next beam section.
According to the scheme provided by the invention, the super-wide box girder can be quickly and efficiently subjected to cantilever casting, the bending moment can be effectively distributed through the main longitudinal beams of the four main trusses, the deformation is coordinated, and the requirement on the rigidity of the main girder is low; the hanging basket has simple structure, convenient and quick installation and low cost; the practicality is strong, and factor of safety is high, reduces the safe risk in the work progress.
By adopting the technical scheme of the invention,
preferably, the demolding and walking processes of the hanging basket are as follows:
a, sliding an inner side die of a diaphragm plate downwards along a slide rail and flatly placing the inner side die on a lower platform longitudinal beam;
b, lowering the inner top mold frame by 190 plus 200cm by using the inner top mold hanging rod, and placing the inner top mold frame on the lower platform longitudinal beam;
c, integrally descending the lower platform by using the front suspender, the rear suspender and the walking suspender to enable the top surface of the inner top mold to be 15-20cm away from the bottom of the diaphragm;
d, transferring the load at the rear part of the lower platform onto the walking beam, lengthening the inner walking beam, and dismantling the rear suspender;
e, dismantling the rear walking track to the front end, installing a counter-force seat and a jack, and laying a walking wheel counter-pull measure by utilizing the reversed anchor hole;
f, enabling the triangular truss to walk forwards for one jack stroke and then stop; newly installing a group of rear anchor rods, and then moving forward and anchoring the rear anchor rods positioned in the last group; finally, removing the first middle group of rear anchor rods; and circularly operating until the walking is in place;
g, mounting a rear suspender, lifting the lower platform by using the front suspender and the rear suspender, dismantling the walking suspender, and moving the walking riding wheel forwards; and installing an internal mold suspender, and lifting the internal mold jacking frame in place. The demolding process is simple and quick. The construction efficiency can be improved.
Preferably, in the concrete pouring process, the pouring sequence is as follows: bottom plate → diagonal web → side box beam → straight web → middle box beam; when the top surface is poured, the solid sections on the two sides are poured firstly, then the side box tops are poured, and finally the pouring of the middle box top is finished. The balance of the lower platform can be kept, and the construction safety is ensured.
Preferably, during the installation of the reinforcing steel bars, half of the longitudinal reinforcing steel bars extend out of the cantilever sections to occupy one tenth of the total length, and the other half of the longitudinal reinforcing steel bars extend out of the cantilever sections to occupy one quarter of the total length. The strength of the structure is ensured.
Preferably, in the concrete curing process, the average temperature is lower than 5 ℃ on the day, the concrete construction is carried out according to winter, a plastic film is covered on the surface of the concrete, the front end, the rear end and the two sides of the beam body are shielded and insulated by straw mats, and the beam body is kept moist by paying attention;
when the daily average temperature is higher than 5 ℃, the concrete construction is carried out according to summer, a plastic film is covered on the surface of the concrete, and a spray water pipe is arranged for maintenance. The setting speed and the strength of the concrete are ensured.
Preferably, in the template installation process, a central line of a main beam, a central line of a transverse partition beam and a front end line of a section to be poured are drawn on the hanging basket platform, and the bottom die is spliced from the central line to two sides.
Preferably, the front fulcrum and the rear fulcrum of the triangular truss are ship-shaped tractors; the boat-shaped tractor moves in the section steel track. The triangular truss is ensured to move stably.
The invention has the advantages that the safe and efficient construction can be realized aiming at the ultra-wide box girder, and the structure of the hanging basket is simple; high strength, low cost and stable operation.
Drawings
Fig. 1 is a schematic structural view of a hanging basket in the invention.
Fig. 2 is a schematic structural view of the hanging basket in a construction state.
The reference numerals and components referred to in the drawings are as follows:
the device comprises a poured main beam 1, a triangular truss 2, a front upper cross beam 3, a front suspender 4, a rear suspender 5, a walking suspender 6, a rear anchor beam 7, a steel type slideway 8 and a lower platform 9.
Detailed Description
In order to make the technical means, the creation characteristics, the achievement purposes and the effects of the invention easy to understand, the invention is further explained below by combining the specific drawings.
As shown in fig. 1 and 2, a construction method of an ultra-wide box girder multi-truss-piece combined hanging basket. Wherein, hang the basket and include: a load bearing system, a suspension system, an anchoring system, a lower platform system.
The construction steps are as follows:
assembling a hanging basket:
firstly, installing a main truss, and symmetrically laying 4 tracks along the center of a 0-2 # poured main girder; respectively fixing 4 triangular trusses 2 on a track, and temporarily anchoring the single main truss; the front upper cross beam 3 is arranged at the front ends of the two triangular trusses 2 positioned on the same side, and the two triangular trusses 2 positioned on the same side are reinforced by the cross beam;
and then dismantling the bracket bowl buckle frame part of the cast girder of the No. 0-2 girder, assembling a lower platform 9 on the Bailey girder of the bracket and a distribution girder on the Bailey girder, sliding the lower platform 9 in place by using a tackle pulley set, and anchoring the lower platform 9 by using a front suspender 4, a rear suspender 5 and a walking suspender 6. Wherein, the front fulcrum and the rear fulcrum of the triangular truss 2 are ship-shaped tractors; the boat-shaped tractor moves in the section steel track.
B, simulating load preloading:
the pre-pressing loading is carried out according to the grade of 60%, 80%, 100% and 110% of the load borne by the cradle, and the load distribution of the beam body is simulated in the load distribution section mode. And each stage of loading is symmetrical and balanced, after the pre-pressing is finished, the piled loading is removed in stages, and meanwhile, the rebound deformation value of the cradle is measured. After the load test is finished, the measurement data are collected, and a load test report is formed and used as an adjustment value of the elevation of the hanging basket vertical mold.
C, hanging a basket in place and installing a template:
4 triangular main trusses are pushed by 4 oil jacks of the same type in a back pressure mode; 4 main trusses are made to run in place in a counter-pressure mode, and 2 groups of rear anchor rods are arranged for anchoring; and then, the installation of a bottom die (comprising an inclined web plate bottom die and an anchor block bottom die), a middle box template, a side box inner die, a diaphragm beam template and an end template is completed on the lower platform 9.
The bottom die is made of a large customized steel die, a main beam central line, a diaphragm beam central line and a front end line of a section to be poured are drawn on the cradle platform, the middle line of the bottom die is spliced to two sides, and the bottom die is welded on a distribution beam of the lower platform 9 through a connecting rod. The inclined web plate bottom die and the anchor block template are directly paved on the longitudinal beam of the lower platform 9 through the bracket. The middle box template comprises a straight web plate side die and a main beam opening box top plate bottom die which are made of customized steel dies.
The open box template is lifted by a suspender steel flower stand, and is supported by a supporting rod together with the corner part of the side box web plate, and the side box straight web plate template is assembled and disassembled by a combined steel mould in each section. In order to prevent the inner mold from floating upwards, a diagonal tie bar is arranged between the inclined bottom mold and the inclined web plate bottom mold in the side box. The end mold is a wood board mold vertical to the bottom mold. And adjusting the turning positions of the templates by adopting wood moulds or wood wedges.
D, installing a steel bar, an embedded part and a prestress system:
the steel bars comprise two layers of steel bar meshes of a bottom plate inclined web plate, two layers of steel bar meshes of a diaphragm beam, two layers of straight web plate steel bar meshes, a solid section and anchor block steel bars, and two layers of steel bar meshes of a top plate;
and the bottom plate, the inclined web plate, the top plate steel bars, the solid section and the anchor block steel bars are all bound on the bridge on site. The steel bars are preferably mechanically connected, and half of the steel bar joints are distributed in a staggered manner; installing corrugated pipes in the steel bar mesh sheets of the transverse partition beams in sections, and penetrating steel strand bundles;
the embedded parts comprise a hanging basket preformed hole embedded part, a hanging belt preformed hole embedded part, a hanging basket walkway embedded part, a cable laying walkway embedded part, a hanging cable embedded part and a construction measurement embedded part.
E, concrete pouring and curing:
in the process of pouring concrete, concrete materials are conveyed to main beams at two ends through a concrete pump conveying pipe, and the concrete materials are conveyed from low to high from the outer side to the middle; the top surface of the beam body is smoothed by using wood plastering slurry; and pouring according to the height of each layer of 50 cm in a layered manner, and inserting a vibrating rod for vibrating and compacting. The surface of the steel wire rope is ensured to have no honeycomb rib exposing phenomenon, and the joint is good. The area of the pitted surface is not more than 1 percent of the area of the same side. Spraying curing agent on the surface of the concrete, covering the heat-insulating layer, and curing for more than 7 days. And when the strength of the concrete reaches 2.5Mpa, the end mould is dismantled and roughened.
F, tensioning and grouting:
after the concrete strength reaches 90%, demolding and pre-stress tensioning are carried out in the sequence from the longitudinal direction to the transverse direction; during the tensioning process, the procedure was carried out in the order of 0 → 20% sigma k → 40% sigma k → 100% sigma k → sigma k (anchoring) → 0. And the elongation at each stage was recorded.
The longitudinal prestress tensioning sequence is carried out according to the principle of symmetry up, down, left and right, and enough jacks are required to be equipped on site so as to meet the requirement of simultaneously tensioning two symmetrical cantilever sections. The broken and sliding wires of the tension should not exceed 1% of the total number of the steel wires of the section; the sum of the retraction amount of the two ends is not more than 6mm, and the slippage of each end is less than or equal to 3 mm; the elongation error of the steel beam is less than or equal to +/-6 percent.
And (4) grouting and end sealing are carried out after all the longitudinal and transverse prestressed tendons are tensioned.
G, the hanging basket moves forwards and enters the construction cycle of the next beam section.
Wherein, the demolding and walking processes of the hanging basket are as follows:
a, sliding the inner side die of the diaphragm plate downwards along the slide rail and flatly placing the inner side die on the longitudinal beam of the lower platform 9.
And b, descending the inner top formwork by 190-200cm by using the inner top formwork hanger rod, and resting on the longitudinal beam of the lower platform 9.
c, the front suspender 4, the rear suspender 5 and the walking suspender 6 are used for integrally descending the lower platform 9, so that the top surface of the inner top mould is 15-20cm away from the bottom of the diaphragm.
d, transferring the load at the rear part of the lower platform 9 to the walking beam; and lengthening the inner walking beam; the rear boom 5 is removed.
e, dismantling the rear walking rail to the front end, and installing a counter-force seat and a jack; and (5) arranging a travelling wheel reverse pulling measure by using the inverted anchor hole.
f, enabling the triangular truss 2 to move forwards for one jack stroke and then stop; newly installing a group of rear anchor rods, and then moving forward and anchoring the rear anchor rods positioned in the last group; finally, removing the first middle group of rear anchor rods; and circularly operating until the walking is in place;
g, mounting a rear suspender 5, lifting a lower platform 9 by using the front suspender 5 and the rear suspender, dismantling the walking suspender 6, and moving the walking riding wheel forwards; and installing an internal mold suspender, and lifting the internal mold jacking frame in place.
In the whole construction process, the linear type and the cable force of the main beam need to be controlled in a double way; the cable force control comprises three stages of hanging the guy cable, pouring concrete and tensioning permanent cable force. The linear control of the main beam comprises four stages of hanging basket in-place set elevation, concrete poured elevation, stayed cable stretched elevation and hanging basket descending running in-place elevation, and correction is carried out on tower displacement, main beam mileage, main beam center line, construction temperature and the like.
During the concrete curing process, the average temperature is lower than 5 ℃ on the day, the concrete construction is carried out according to winter, a plastic film is covered on the surface of the concrete, the front end, the rear end and the two sides of the beam body are shielded and insulated by straw mats, and the beam body is kept moist; when the daily average temperature is higher than 5 ℃, the concrete construction is carried out according to summer, a plastic film is covered on the surface of the concrete, and a spray water pipe is arranged for maintenance.
The foregoing illustrates and describes the principles, general features, and advantages of the present invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are intended as illustrations of the principles of the invention, and that other variations and modifications may be made without departing from the spirit and scope of the invention, which variations and modifications are within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (6)
1. A construction method of an ultra-wide box girder multi-truss-piece combined hanging basket is characterized by comprising the following steps:
assembling a hanging basket:
firstly, installing a main truss, and symmetrically laying 4 tracks along the center of a 0-2 # poured main girder; respectively fixing 4 triangular trusses on a track, and temporarily anchoring the single main truss; the front upper cross beam is arranged at the front ends of the two triangular trusses positioned on the same side, and the two triangular trusses positioned on the same side are reinforced by the cross beam;
then dismantling a bracket bowl buckle frame part of a No. 0-2 cast main beam of the main beam, assembling a lower platform on a Bailey beam of the bracket and a distribution beam on the Bailey beam, sliding the lower platform in place by using a tackle pulley set, and anchoring the lower platform by using a front suspender, a rear suspender and a walking suspender;
b, simulating load preloading:
the pre-pressing loading is carried out according to the grade of 60%, 80%, 100% and 110% of the load borne by the hanging basket, and each grade of loading is symmetrical and balanced; recording deformation data before and after loading as an adjustment value of the vertical mold height of the hanging basket;
c, hanging a basket in place and installing a template:
pushing 4 triangular main trusses by using 4 oil hydraulic jacks of the same type in a back pressure manner to enable the 4 main trusses to run in place in a back pressure manner, and setting 2 groups of rear anchor rods for anchoring;
lifting the lower platform to the proper position by the screw jacks on the suspenders; and the installation of a bottom die, a middle box template, a side box internal mold, a diaphragm beam template and an end template is completed on the lower platform; wherein the bottom die comprises a slant web bottom die and an anchor block bottom die;
d, installing a steel bar, an embedded part and a prestress system:
the steel bars comprise two layers of steel bar meshes of a bottom plate inclined web plate, two layers of steel bar meshes of a diaphragm beam, two layers of straight web plate steel bar meshes, a solid section and anchor block steel bars, and two layers of steel bar meshes of a top plate; the steel bars are mechanically connected, and half of the steel bar joints are distributed in a staggered manner; installing corrugated pipes in the steel bar mesh sheets of the transverse partition beams in sections, and penetrating steel strand bundles;
the embedded parts comprise hanging basket preformed hole embedded parts, hanging belt preformed hole embedded parts, hanging basket walkway embedded parts, cable laying walkway embedded parts, hanging cable embedded parts and construction measurement embedded parts;
e, concrete pouring and curing:
when concrete is poured, the concrete is poured from the lower part to the higher part in sequence from the outer side to the middle part; the top surface of the beam body is smoothed by using wood plastering slurry; spraying curing agent on the surface of the concrete, covering the heat-insulating layer, and curing for more than 7 days;
f, tensioning and grouting;
after the concrete strength reaches 90%, demolding and pre-stress tensioning are carried out in the sequence from the longitudinal direction to the transverse direction; after tensioning is finished, grouting and sealing the end;
g hangs basket antedisplacement, gets into the construction circulation of next beam section:
the demolding and walking processes of the hanging basket are as follows:
a, sliding an inner side die of a diaphragm plate downwards along a slide rail and flatly placing the inner side die on a lower platform longitudinal beam;
b, lowering the inner top mold frame by 190 plus 200cm by using the inner top mold hanging rod, and placing the inner top mold frame on the lower platform longitudinal beam;
c, integrally descending the lower platform by using the front suspender, the rear suspender and the walking suspender to enable the top surface of the inner top mold to be 15-20cm away from the bottom of the diaphragm;
d, transferring the load at the rear part of the lower platform onto the walking beam, lengthening the inner walking beam, and dismantling the rear suspender;
e, dismantling the rear walking track to the front end, installing a counter-force seat and a jack, and laying a walking wheel counter-pull measure by utilizing the reversed anchor hole;
f, enabling the triangular truss to walk forwards for one jack stroke and then stop; newly installing a group of rear anchor rods, and then moving forward and anchoring the rear anchor rods positioned in the last group; finally, removing the first middle group of rear anchor rods; and circularly operating until the user walks in place:
g, mounting a rear suspender, lifting the lower platform by using the front suspender and the rear suspender, dismantling the walking suspender, and moving the walking riding wheel forwards; and installing an internal mold suspender, and lifting the internal mold jacking frame in place.
2. The construction method of the ultra-wide box girder multi-truss-piece combined hanging basket according to claim 1, characterized in that: in the concrete pouring process, the pouring sequence is as follows: bottom plate → diagonal web → side box beam → straight web → middle box beam; when the top surface is poured, the solid sections on the two sides are poured firstly, then the side box tops are poured, and finally the pouring of the middle box top is finished.
3. The construction method of the ultra-wide box girder multi-truss-piece combined hanging basket according to claim 1, characterized in that: in the process of installing the reinforcing steel bars, half of the longitudinal reinforcing steel bars extend out of the cantilever sections to occupy one tenth of the total length, and the other half of the longitudinal reinforcing steel bars extend out of the cantilever sections to occupy one fourth of the total length.
4. The construction method of the ultra-wide box girder multi-truss-piece combined hanging basket according to claim 1, characterized in that: in the concrete curing process, the average temperature is lower than 5 ℃ on the day, the concrete construction is carried out according to winter, a plastic film is covered on the surface of the concrete, the front end, the rear end and the two sides of the beam body are shielded and insulated by straw mats, and the beam body is kept moist;
when the daily average temperature is higher than 5 ℃, the concrete construction is carried out according to summer, a plastic film is covered on the surface of the concrete, and a spray water pipe is arranged for maintenance.
5. The construction method of the ultra-wide box girder multi-truss-piece combined hanging basket according to claim 1, characterized in that: during the installation of the template, the central line of a main beam, the central line of a diaphragm beam and the front end line of a section to be poured are drawn on a hanging basket platform, and the bottom plate is spliced from the central line to two sides.
6. The construction method of the ultra-wide box girder multi-truss-piece combined hanging basket according to claim 1, characterized in that: the front fulcrum and the rear fulcrum of the triangular truss are ship-shaped tractors; the boat-shaped tractor moves in the section steel track.
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| CN110528402A (en) | 2019-12-03 |
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