CN111501519A - Full-section prestressed concrete combined box girder bridge structure and construction process - Google Patents
Full-section prestressed concrete combined box girder bridge structure and construction process Download PDFInfo
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- CN111501519A CN111501519A CN202010411979.7A CN202010411979A CN111501519A CN 111501519 A CN111501519 A CN 111501519A CN 202010411979 A CN202010411979 A CN 202010411979A CN 111501519 A CN111501519 A CN 111501519A
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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
- E01C—CONSTRUCTION OF, OR SURFACES FOR, ROADS, SPORTS GROUNDS, OR THE LIKE; MACHINES OR AUXILIARY TOOLS FOR CONSTRUCTION OR REPAIR
- E01C1/00—Design or layout of roads, e.g. for noise abatement, for gas absorption
- E01C1/04—Road crossings on different levels; Interconnections between roads on different levels
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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
- E01D19/02—Piers; Abutments ; Protecting same against drifting ice
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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
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
- E01D2101/26—Concrete reinforced
- E01D2101/28—Concrete reinforced prestressed
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Abstract
The invention relates to a full-section prestressed concrete combined box girder bridge structure, which comprises a main bridge, a C-ramp bridge and an I-ramp bridge, wherein the main bridge is connected with the I-ramp bridge through the C-ramp bridge, the whole bridge is made of bowl-buckled type support lapping, and the construction process comprises the following steps: the foundation treatment, the support erection, the support prepressing, the side mold installation, the reinforcement binding and the concrete pouring have the advantages of reasonable structure, reasonable material distribution and high utilization efficiency; structural rigidity is big, reinforcing burden prestressing force, and the support pre-compaction is set up through ground treatment and support: the bowl buckle support and the template design scheme have the advantages that the cast-in-place box girder adopts a full-hall type bowl buckle support form, the stress area of the bearing platform is ensured, the maintenance is easy, and the durability is good.
Description
Technical Field
The invention relates to the technical field of building construction, in particular to a full-section prestressed concrete combined box girder bridge structure and a construction process for designing two directional ramps, namely a right-turn ramp I ramp connected with a main line elevated frame and a C ramp connected with a ground auxiliary track and the main line elevated frame.
Background
At present, the basement area of the existing box girder is large, the earth volume needing to be excavated is large, in addition, because the construction site has complex terrain and is provided with a pond or a village, the traditional mode is adopted to influence local facilities, in addition, the existing mode and the process top plate prestress are adopted to impose difficulties, and the prestress degree is limited.
Disclosure of Invention
The invention aims to solve the technical problem of providing a full-section prestressed concrete combined box girder bridge structure which is reasonable in structure, convenient and simple to construct, easy to maintain, convenient to pass and good in safety performance.
In order to solve the technical problems, the invention provides a full-section prestressed concrete combined box girder bridge structure which comprises a main bridge, a C-ramp bridge and an I-ramp bridge, wherein the main bridge is connected with the I-ramp bridge through the C-ramp bridge, and the whole bridge is made of bowl-buckled type support lapping;
the C-ramp bridge is arranged on one side of the I-ramp bridge, the C-ramp bridge is arranged into at least four standard sections, the C-ramp bridge is arranged in a sub-zone of a ground auxiliary road, a pile group foundation of a bearing platform is connected below the C-ramp bridge, the first standard section of the C-ramp is arranged to be 7m-9m in width, the height of a box girder is 1 m-1.6m, the first standard section of the C-ramp is composed of an upper cast-in-place box girder bridge floor, a lower bridge abutment, a bridge pier main body and a support frame, the bridge pier main body adopts a flower vase-shaped pier, the third standard section of the C-ramp is arranged to be 7m-9m in width, the height of the box girder is 1.9m-2.2m, the fourth standard section of the C-ramp is arranged to be 7m-9m in width, and the height of the box girder is 1;
the I-turn road bridge is set to be at least a fourteen-link standard section, a box girder is cast in situ at the upper part of the I-turn road bridge, a vase-shaped pier is adopted as a main pier of a lower structure, a pile-connected capping beam type pier is adopted as an auxiliary pier, the width of the I-turn first road bridge is 7m-9m, the height of the box girder is 1.2-1.6m, the width of the I-turn second road bridge is 7m-9m, the height of the box girder is 2.0m-2.2m, the width of the I-turn third road bridge is 7m-9m, the height of the box girder is 1.6m-1.8m, the width of the I-turn fourth road bridge is 11.007 m-4.75 m, and the height of the box girder is 1.4m-1.6 m;
preferably, the method further comprises a bilateral widened small bridge, wherein hollow plate girders are prefabricated at the upper part of the bilateral widened small bridge, pile-connected bent cap type abutments are adopted at the lower part of the bilateral widened small bridge, and all pile foundations are cast-in-situ piles.
Preferably, the main bridge adopts C50 concrete, and the concrete is intensively mixed by mixing.
Preferably, the C-turn road bridge and the I-turn road bridge are formed by mixing and penetrating concrete, reinforcing steel bars and steel strands.
The invention also provides a construction process which comprises the following steps:
1) foundation treatment: determining the construction of the upper structure of the cast-in-place box girder, the coordinate and elevation of the full bridge, the structural size of each member, the construction amount of reinforcing steel bars and concrete and the construction sequence of each member, taking each connection as a unit through the support foundation treatment, widening the cross bridge of the section by 50cm out of the support, widening the cross bridge of the river section by 100cm out of the support, and completely performing foundation treatment along the bridge direction; firstly, carrying out foundation treatment on a bearing platform, filling the foundation by using plain soil in layers, wherein the thickness of each layer of virtual pavement is 30-40cm, compacting each layer of plain soil by using compacting equipment after leveling, the degree of compaction is 70-90% till the depth is 20-30cm below the original ground, filling the plain soil after the filling of the plain soil is finished, filling 5% lime soil in thickness, compacting by using a road roller, the degree of compaction is not less than 93%, and pouring 15cmC20 concrete foundation on the lime soil after the compaction of 5% lime soil; secondly, carrying out mud pit treatment, excavating raw mud to original state soil, backfilling plain soil in layers, wherein the thickness of each layer of virtual pavement is 25-40cm, each layer of plain soil is compacted by a compaction device after being leveled, the compaction degree is 80-90% until the plain soil is 30cm below the original ground, lime soil with the thickness of 30cm and the thickness of 5% is filled on the plain soil after the plain soil is filled, compacting is carried out by a road roller, the compaction degree is not less than 93%, a 15cmC20 concrete foundation is poured on the 5% lime soil after the 5% lime soil is compacted, the concrete foundation is provided with a transverse slope and a longitudinal slope of 0.5%, in addition, carrying out treatment crossing a river pond foundation, backfilling sludge in the river pond, carrying out layered rolling by a plain soil roller, rolling by a 20-ton road roller, each layer of rolling compaction degree is 83-93%, the layer thickness is 30-40cm, the backfilling width exceeds the front projection surface of a box girder support by 3m, the side slope adopts a C20, backfilling to 50cm above water surface, and adding 30cm5% lime soil 5-20cm C20 concrete with 0.5% transverse slope and longitudinal slope on the concrete foundation; and the third branch of the I-shaped ramp is used for supporting the bridge deck of the support part of the flange plate, and finally, the foundation is drained: excavating a drainage ditch on the outer side of the support foundation;
2) erecting a support: support is detained to bowl, template design, cast-in-place box girder adopts full hall formula bowl to detain support form, the support width is box girder top width and adds both sides working width, bridge beam supports's maximum height is 16.4m, box girder structure position has the end crossbeam, well crossbeam, the bottom plate, the web, flange board and roof, stride the well general section, be close crossbeam department bottom plate, the web, the roof thickens gradually, a pedestal, the setting of top support is on the concrete foundation top surface that has handled, indulge, adjustable base is laid to horizontal interval, the steel sheet thickness 6mm of bottom plate, the support top sets up height-adjustable's U-shaped top support, steel sheet thickness 5 mm. The meshing length of the base, the top support and the upright rod adjusting nut is 6 buttons, and the length of the base, the top support and the upright rod adjusting nut inserted into the upright rod is 150 mm;
wherein, the construction of bowl buckle support: lofting the positions of the supports, lofting lines according to row spacing after lofting, then placing floor sweeping rods, supporting and fastening the vertical rods one by one with the floor sweeping rods, installing cross rods of the first step, fastening with the vertical rods, installing cross rods of the second step, additionally arranging temporary diagonal rods and installing cross rods of the third step and the fourth step, additionally arranging cross braces and reinforcing fasteners, and paving channel steel, battens and bottom moulds;
3) pre-pressing a support: the method comprises the following steps of pre-pressing the supports, when the supports of the combined support are fully stable and pre-pressed for 7 days, unloading symmetrically in a grading mode, pouring box girders, loading in a grading mode according to the sequence of concrete pouring, and carrying out grading loading according to 60% → 80% → 100% → 120%, and firstly carrying out bottom plates, web plates, rear top plates and wing plates; loading to 20% of the dead weight of the box girder, and adjusting the bottom die;
4) installing a side die: all box girders are made of bamboo plywood, a bottom die is directly paved on longitudinal battens, when the bottom die is paved, abutted seams along the battens are spliced on the battens, board seams are pasted by using adhesive tapes, the elevation of a template is measured by using a leveling instrument, and an adjustable screw rod is jacked at the top of a support for correction; a water outlet is arranged at the bottom die position of the lowest point of each span;
the box girder side forms are erected on the bottom die, a batten small beam and a vertical steel pipe large beam are backed, each inclined support steel pipe is respectively connected with the vertical rods of the bracket, a reverse pull rod is arranged at the position of each row of vertical rods connected with the inclined support rod, the length of the reverse pull rod is at least from the outermost vertical rod to the second vertical rod below the bottom plate, each pull rod is not less than 3 fasteners, the bottom die is erected firstly, then the side forms are erected, and the inner die is installed after the bottom plate steel bars are bound;
5) binding reinforcing steel bars, and installing and positioning a prestressed pipeline: installing steel bars, namely installing and binding steel bars of a bottom plate of the box girder, a web steel bar framework and the steel bars; the transverse partition plate steel bar framework and the steel bars are installed and bound with the steel bars and the chamfer steel bars on the upper layer of the bottom plate of the box girder; after the second time of mounting the inner box chamber model, mounting and binding embedded parts such as upper and lower layer steel bars, chamfering steel bars, guardrails, expansion joints and the like of the top plate; then installing an internal mold side plate;
6) pouring concrete: the box girder concrete is poured twice, and the time interval of pouring twice is not more than 9 days. Pouring a bottom plate and a web plate for the first time, wherein a boundary point of the two-time pouring is arranged at the junction of a top plate and the web plate, and battens with the thickness of 2cm are arranged at wing plates and the junction; removing the side plates of the inner mold after secondary curing of the concrete, and installing a top plate of the inner mold; and (4) prestressed tensioning and grouting, sealing and paving, and finally dismantling the support.
The concrete pouring process comprises the following steps: pouring from low to high in a layered mode from one end to the other end, pouring a longitudinal header beam at one time, and vertically pouring according to a bottom plate, a web plate and a top plate in sequence.
The bending angle of the curved hook part is 30-45 degrees.
Compared with the prior art, the invention has the following advantages:
the application relates to east → north, south → east two direction ramps, a right turn ramp (I ramp) connects thread elevated frame and Changjiang river dawn, set up ramp (C ramp) and connect ground auxiliary road and thread elevated frame, upper portion construction supply cable passes through PVC pipe and adheres to bridge on the outside support to insert each distribution electronic box on the cast-in-place case roof beam, construction maintenance water adopts clear river to maintain, case roof beam construction does not have the safety influence to peripheral building (structure) thing, does not influence public facilities such as peripheral communication and road. The construction site is reasonable in site selection, the structure is safe, the enclosure and the enclosure are firm and reliable, potential safety hazards do not exist, the I-turn road of the project crosses over a rural cement road, the safety maintenance of the intersection is enhanced, the identification signs are made, and personnel are arranged to command and guide the entering and exiting construction vehicles, the existing overground underground pipelines are prevented from migrating, and the overground underground pipelines do not exist during the construction of the cast-in-place box girder. The 11 th to 14 th joints of the I-turn road are connected with the large road in a width splicing manner, and the elevation of an old bridge is retested before the construction of a bridge substructure, so that the forward connection of new and old bridges is ensured.
Structural rigidity is big, reinforcing negative prestress, support pre-compaction: carry out the pre-compaction to the support, when this allies oneself with support fully stable and pre-compaction 7 days time, the symmetrical uninstallation of reclassification, the box girder is poured again, the ligature reinforcing bar, installation and location prestressing force pipeline: installing steel bars, namely installing and binding steel bars of a bottom plate of the box girder, a web steel bar framework and the steel bars; the transverse partition plate steel bar framework and the steel bars are installed and bound with the steel bars and the chamfer steel bars on the upper layer of the bottom plate of the box girder; after the second time of mounting the inner box chamber model, mounting and binding embedded parts such as upper and lower layer steel bars, chamfering steel bars, guardrails, expansion joints and the like of the top plate; then mounting an internal mold side plate to enhance the stability of the bridge body;
the structure is reasonable, the material distribution is reasonable, and the utilization efficiency is high; through ground treatment and support erection: the bowl buckle support and the template design scheme have the advantages that the cast-in-place box girder adopts a full-hall type bowl buckle support form, the stress area of the bearing platform is ensured, the maintenance is easy, and the durability is good.
Drawings
FIG. 1 is a flow chart of the construction process of the whole-section prestressed concrete combined box girder bridge structure.
Fig. 2 is a layout view of a full-section prestressed concrete composite box girder bridge construction according to the present invention.
FIG. 3 is a schematic view of a C-ramp bridge structure in the full-section prestressed concrete composite box girder bridge structure.
FIG. 4 is a schematic view of an I-turn road bridge structure in the full-section prestressed concrete combined box girder bridge structure.
Detailed Description
The invention is further described with reference to the following examples, but the scope of the invention is not limited thereto:
as shown in fig. 2-4, a full-section prestressed concrete combined box girder bridge structure comprises a main bridge 1, a C-ramp bridge 2 and an I-ramp bridge 3, wherein the main bridge 1 is connected with the I-ramp bridge 3 through the C-ramp bridge 2, and is integrally made of a bowl-buckle type bracket;
the C-ramp bridge 2 is arranged on one side of the I-ramp bridge 3, the C-ramp bridge 2 is arranged into at least a quadruple standard section, the C-ramp bridge 2 is arranged in a sub-zone of a ground auxiliary road, a pile foundation of a bearing platform is connected below the sub-zone, a first series standard section 11 of the C-ramp is arranged to be 7m-9m in width, the height of a box girder is 1 m-1.6m, the first series standard section 11 of the C-ramp is composed of an upper cast-in-place box girder bridge deck 112, a lower bridge abutment 113, a pier main body 114 and a support frame 115, the pier main body 114 adopts a 'flower-shaped pier', a third series standard section 12 of the C-ramp is arranged to be 7m-9m in width, the height of the box girder is 1.9m-2.2m, a fourth series standard section 13 of the C-ramp is arranged to be 7m-9m in width, and the height of the box girder is;
the I-turn road bridge 3 is set to be at least a fourteen-link standard section, a box girder is cast in situ on the upper part of the I-turn road bridge 3, a main pier of a lower structure adopts a vase-shaped pier, an auxiliary pier adopts a pile-connected capping beam type pier, the width of the I-turn first road bridge 31 is 7m-9m, the height of the box girder is 1.2-1.6m, the width of the I-turn second road bridge 32 is 7m-9m, the height of the box girder is 2.0m-2.2m, the width of the I-turn third road bridge 33 is 7m-9m, the height of the box girder is 1.6m-1.8m, the width of the I-turn fourth road bridge 34 is 11.007 m-4.75 m, and the height of the box girder is 1.4m-1.6 m;
the method is characterized by further comprising a double-side widened small bridge 4, wherein hollow plate girders are prefabricated on the upper portion of the double-side widened small bridge 4, pile-connected bent cap type abutments are adopted on the lower portion of the double-side widened small bridge, and all pile foundations are cast-in-place piles.
The main bridge 1 adopts C50 concrete, and the concrete is intensively mixed and stirred by mixing.
The C-turn road bridge 2 and the I-turn road bridge 3 are formed by mixing and penetrating concrete, reinforcing steel bars and steel stranded wires.
As shown in fig. 1, the construction process of the full-section prestressed concrete composite box girder bridge structure comprises the following steps:
1) foundation treatment: determining the construction of the upper structure of the cast-in-place box girder, the coordinate and elevation of the full bridge, the structural size of each member, the construction amount of reinforcing steel bars and concrete and the construction sequence of each member, taking each connection as a unit through the support foundation treatment, widening the cross bridge of the section by 50cm out of the support, widening the cross bridge of the river section by 100cm out of the support, and completely performing foundation treatment along the bridge direction; firstly, carrying out foundation treatment on a bearing platform, filling the foundation by using plain soil in layers, wherein the thickness of each layer of virtual pavement is 30-40cm, compacting each layer of plain soil by using compacting equipment after leveling, the degree of compaction is 70-90% till the depth is 20-30cm below the original ground, filling the plain soil after the filling of the plain soil is finished, filling 5% lime soil in thickness, compacting by using a road roller, the degree of compaction is not less than 93%, and pouring 15cmC20 concrete foundation on the lime soil after the compaction of 5% lime soil; secondly, carrying out mud pit treatment, excavating raw mud to original state soil, backfilling plain soil in layers, wherein the thickness of each layer of virtual pavement is 25-40cm, each layer of plain soil is compacted by a compaction device after being leveled, the compaction degree is 80-90% until the plain soil is 30cm below the original ground, lime soil with the thickness of 30cm and the thickness of 5% is filled on the plain soil after the plain soil is filled, compacting is carried out by a road roller, the compaction degree is not less than 93%, a 15cmC20 concrete foundation is poured on the 5% lime soil after the 5% lime soil is compacted, the concrete foundation is provided with a transverse slope and a longitudinal slope of 0.5%, in addition, carrying out treatment crossing a river pond foundation, backfilling sludge in the river pond, carrying out layered rolling by a plain soil roller, rolling by a 20-ton road roller, each layer of rolling compaction degree is 83-93%, the layer thickness is 30-40cm, the backfilling width exceeds the front projection surface of a box girder support by 3m, the side slope adopts a C20, backfilling to 50cm above water surface, and adding 30cm5% lime soil 5-20cm C20 concrete with 0.5% transverse slope and longitudinal slope on the concrete foundation; and the third branch of the I-shaped ramp is used for supporting the bridge deck of the support part of the flange plate, and finally, the foundation is drained: excavating a drainage ditch on the outer side of the support foundation;
2) erecting a support: support is detained to bowl, template design, cast-in-place box girder adopts full hall formula bowl to detain support form, the support width is box girder top width and adds both sides working width, bridge beam supports's maximum height is 16.4m, box girder structure position has the end crossbeam, well crossbeam, the bottom plate, the web, flange board and roof, stride the well general section, be close crossbeam department bottom plate, the web, the roof thickens gradually, a pedestal, the setting of top support is on the concrete foundation top surface that has handled, indulge, adjustable base is laid to horizontal interval, the steel sheet thickness 6mm of bottom plate, the support top sets up height-adjustable's U-shaped top support, steel sheet thickness 5 mm. The meshing length of the base, the top support and the upright rod adjusting nut is 6 buttons, and the length of the base, the top support and the upright rod adjusting nut inserted into the upright rod is 150 mm;
wherein, the construction of bowl buckle support: lofting the positions of the supports, lofting lines according to row spacing after lofting, then placing floor sweeping rods, supporting and fastening the vertical rods one by one with the floor sweeping rods, installing cross rods of the first step, fastening with the vertical rods, installing cross rods of the second step, additionally arranging temporary diagonal rods and installing cross rods of the third step and the fourth step, additionally arranging cross braces and reinforcing fasteners, and paving channel steel, battens and bottom moulds;
3) pre-pressing a support: the method comprises the following steps of pre-pressing the supports, when the supports of the combined support are fully stable and pre-pressed for 7 days, unloading symmetrically in a grading mode, pouring box girders, loading in a grading mode according to the sequence of concrete pouring, and carrying out grading loading according to 60% → 80% → 100% → 120%, and firstly carrying out bottom plates, web plates, rear top plates and wing plates; loading to 20% of the dead weight of the box girder, and adjusting the bottom die;
4) installing a side die: all box girders are made of bamboo plywood, a bottom die is directly paved on longitudinal battens, when the bottom die is paved, abutted seams along the battens are spliced on the battens, board seams are pasted by using adhesive tapes, the elevation of a template is measured by using a leveling instrument, and an adjustable screw rod is jacked at the top of a support for correction; a water outlet is arranged at the bottom die position of the lowest point of each span;
the box girder side forms are erected on the bottom die, a batten small beam and a vertical steel pipe large beam are backed, each inclined support steel pipe is respectively connected with the vertical rods of the bracket, a reverse pull rod is arranged at the position of each row of vertical rods connected with the inclined support rod, the length of the reverse pull rod is at least from the outermost vertical rod to the second vertical rod below the bottom plate, each pull rod is not less than 3 fasteners, the bottom die is erected firstly, then the side forms are erected, and the inner die is installed after the bottom plate steel bars are bound;
7) binding reinforcing steel bars, and installing and positioning a prestressed pipeline: installing steel bars, namely installing and binding steel bars of a bottom plate of the box girder, a web steel bar framework and the steel bars; the transverse partition plate steel bar framework and the steel bars are installed and bound with the steel bars and the chamfer steel bars on the upper layer of the bottom plate of the box girder; after the second time of mounting the inner box chamber model, mounting and binding embedded parts such as upper and lower layer steel bars, chamfering steel bars, guardrails, expansion joints and the like of the top plate; then installing an internal mold side plate;
8) pouring concrete: the box girder concrete is poured twice, and the time interval of pouring twice is not more than 9 days. Pouring a bottom plate and a web plate for the first time, wherein a boundary point of the two-time pouring is arranged at the junction of a top plate and the web plate, and battens with the thickness of 2cm are arranged at wing plates and the junction; removing the side plates of the inner mold after secondary curing of the concrete, and installing a top plate of the inner mold; and (4) prestressed tensioning and grouting, sealing and paving, and finally dismantling the support.
The concrete pouring process comprises the following steps: pouring from low to high in a layered mode from one end to the other end, pouring a longitudinal header beam at one time, and vertically pouring according to a bottom plate, a web plate and a top plate in sequence.
The specific embodiments described herein are merely illustrative of the principles of the invention. Various modifications or additions may be made to the described embodiments or alternatives may be employed by those skilled in the art without departing from the spirit or ambit of the invention as defined in the appended claims.
Claims (6)
1. The utility model provides a full-section prestressed concrete combination box girder bridge structure which characterized in that: the bridge comprises a main bridge (1), a C-turn road bridge (2) and an I-turn road bridge (3), wherein the main bridge (1) is connected with the I-turn road bridge (3) through the C-turn road bridge (2), and the whole bridge is made of bowl-buckled type support lapping;
the C-ramp bridge (2) is arranged on one side of the I-ramp bridge (3), the C-ramp bridge (2) is arranged into at least a quadruple standard section, the C-ramp bridge (2) and the C-ramp bridge (2) are arranged in a sub-zone of a ground auxiliary road and are connected with a pile foundation of a bearing platform, the first standard section (11) of the C-ramp is arranged to be 7m-9m in width and 1 m-1.6m in height, the first standard section (11) of the C-ramp is composed of an upper cast-in-place box girder bridge floor (112), a lower bridge platform (113), a pier main body (114) and a support frame (115), the pier main body (114) adopts a vase-shaped pier, the setting width of the third connection standard section (12) of the C ramp is 7m-9m, the height of the box girder is 1.9m-2.2m, the setting width of the fourth connection standard section (13) of the C ramp is 7m-9m, and the height of the box girder is 1.6m-1.8 m;
the I-turn road bridge (3) is set to be at least fourteen standard sections, a cast-in-place box girder is arranged at the upper part of the I-turn road bridge (3), a vase-shaped pier is adopted as a main pier of a lower structure, a pile-connected capping beam type pier is adopted as an auxiliary pier, the width of the I-turn first road bridge (31) is 7m-9m, the height of the box girder is 1.2-1.6m, the width of the I-turn second road bridge (32) is 7m-9m, the height of the box girder is 2.0m-2.2m, the width of the I-turn third road bridge (33) is 7m-9m, the height of the box girder is 1.6m-1.8m, the width of the I-turn fourth road bridge (34) is 11.007 m-4.75 m, and the height of the box girder is 1.4m-1.6 m.
2. The full length prestressed concrete composite box girder bridge construction according to claim 1, wherein: the novel cast-in-place pile foundation is characterized by further comprising a bilateral widened small bridge (4), wherein hollow plate girders are prefabricated on the upper portion of the bilateral widened small bridge (4), pile-connected bent cap type abutments are adopted on the lower portion of the bilaterally widened small bridge, and all pile foundations are cast-in-place piles.
3. The full length prestressed concrete composite box girder bridge construction according to claim 1, wherein: the main bridge (1) adopts C50 concrete, and the concrete is intensively mixed and stirred by mixing.
4. The full length prestressed concrete composite box girder bridge construction according to claim 1, wherein: the C-turn road bridge (2) and the I-turn road bridge (3) are formed by mixing and penetrating concrete, reinforcing steel bars and steel stranded wires.
5. A construction process of a full-length prestressed concrete composite box girder bridge structure according to claim 1, wherein the construction process comprises the following steps:
1) foundation treatment: determining the construction of the upper structure of the cast-in-place box girder, the coordinate and elevation of the full bridge, the structural size of each member, the construction amount of reinforcing steel bars and concrete and the construction sequence of each member, taking each connection as a unit through the support foundation treatment, widening the cross bridge of the section by 50cm out of the support, widening the cross bridge of the river section by 100cm out of the support, and completely performing foundation treatment along the bridge direction; firstly, carrying out foundation treatment on a bearing platform, filling the foundation by using plain soil in layers, wherein the thickness of each layer of virtual pavement is 30-40cm, compacting each layer of plain soil by using compacting equipment after leveling, the degree of compaction is 70-90% till the depth is 20-30cm below the original ground, filling the plain soil after the filling of the plain soil is finished, filling 5% lime soil in thickness, compacting by using a road roller, the degree of compaction is not less than 93%, and pouring 15cmC20 concrete foundation on the lime soil after the compaction of 5% lime soil; secondly, carrying out mud pit treatment, excavating raw mud to original state soil, backfilling plain soil in layers, wherein the thickness of each layer of virtual pavement is 25-40cm, each layer of plain soil is compacted by a compaction device after being leveled, the compaction degree is 80-90% until the plain soil is 30cm below the original ground, lime soil with the thickness of 30cm and the thickness of 5% is filled on the plain soil after the plain soil is filled, compacting is carried out by a road roller, the compaction degree is not less than 93%, a 15cmC20 concrete foundation is poured on the 5% lime soil after the 5% lime soil is compacted, the concrete foundation is provided with a transverse slope and a longitudinal slope of 0.5%, in addition, carrying out treatment crossing a river pond foundation, backfilling sludge in the river pond, carrying out layered rolling by a plain soil roller, rolling by a 20-ton road roller, each layer of rolling compaction degree is 83-93%, the layer thickness is 30-40cm, the backfilling width exceeds the front projection surface of a box girder support by 3m, the side slope adopts a C20, backfilling to 50cm above water surface, and adding 30cm5% lime soil 5-20cm C20 concrete with 0.5% transverse slope and longitudinal slope on the concrete foundation; and the third branch of the I-shaped ramp is used for supporting the bridge deck of the support part of the flange plate, and finally, the foundation is drained: excavating a drainage ditch on the outer side of the support foundation;
2) erecting a support: support is detained to bowl, template design, cast-in-place box girder adopts full hall formula bowl to detain support form, the support width is box girder top width and adds both sides working width, bridge beam supports's maximum height is 16.4m, box girder structure position has the end crossbeam, well crossbeam, the bottom plate, the web, flange board and roof, stride the well general section, be close crossbeam department bottom plate, the web, the roof thickens gradually, a pedestal, the setting of top support is on the concrete foundation top surface that has handled, indulge, adjustable base is laid to horizontal interval, the steel sheet thickness 6mm of bottom plate, the support top sets up height-adjustable's U-shaped top support, steel sheet thickness 5 mm. The meshing length of the base, the top support and the upright rod adjusting nut is 6 buttons, and the length of the base, the top support and the upright rod adjusting nut inserted into the upright rod is 150 mm;
wherein, the construction of bowl buckle support: lofting the positions of the supports, lofting lines according to row spacing after lofting, then placing floor sweeping rods, supporting and fastening the vertical rods one by one with the floor sweeping rods, installing cross rods of the first step, fastening with the vertical rods, installing cross rods of the second step, additionally arranging temporary diagonal rods and installing cross rods of the third step and the fourth step, additionally arranging cross braces and reinforcing fasteners, and paving channel steel, battens and bottom moulds;
3) pre-pressing a support: the method comprises the following steps of pre-pressing the supports, when the supports of the combined support are fully stable and pre-pressed for 7 days, unloading symmetrically in a grading mode, pouring box girders, loading in a grading mode according to the sequence of concrete pouring, and carrying out grading loading according to 60% → 80% → 100% → 120%, and firstly carrying out bottom plates, web plates, rear top plates and wing plates; loading to 20% of the dead weight of the box girder, and adjusting the bottom die;
4) installing a side die: all box girders are made of bamboo plywood, a bottom die is directly paved on longitudinal battens, when the bottom die is paved, abutted seams along the battens are spliced on the battens, board seams are pasted by using adhesive tapes, the elevation of a template is measured by using a leveling instrument, and an adjustable screw rod is jacked at the top of a support for correction; a water outlet is arranged at the bottom die position of the lowest point of each span;
the box girder side forms are erected on the bottom die, a batten small beam and a vertical steel pipe large beam are backed, each inclined support steel pipe is respectively connected with the vertical rods of the bracket, a reverse pull rod is arranged at the position of each row of vertical rods connected with the inclined support rod, the length of the reverse pull rod is at least from the outermost vertical rod to the second vertical rod below the bottom plate, each pull rod is not less than 3 fasteners, the bottom die is erected firstly, then the side forms are erected, and the inner die is installed after the bottom plate steel bars are bound;
5) binding reinforcing steel bars, and installing and positioning a prestressed pipeline: installing steel bars, namely installing and binding steel bars of a bottom plate of the box girder, a web steel bar framework and the steel bars; the transverse partition plate steel bar framework and the steel bars are installed and bound with the steel bars and the chamfer steel bars on the upper layer of the bottom plate of the box girder; after the second time of mounting the inner box chamber model, mounting and binding embedded parts such as upper and lower layer steel bars, chamfering steel bars, guardrails, expansion joints and the like of the top plate; then installing an internal mold side plate;
6) pouring concrete: the box girder concrete is poured twice, and the time interval of pouring twice is not more than 9 days. Pouring a bottom plate and a web plate for the first time, wherein a boundary point of the two-time pouring is arranged at the junction of a top plate and the web plate, and battens with the thickness of 2cm are arranged at wing plates and the junction; removing the side plates of the inner mold after secondary curing of the concrete, and installing a top plate of the inner mold; and (4) prestressed tensioning and grouting, sealing and paving, and finally dismantling the support.
6. The construction process of the full segment prestressed concrete combined box girder bridge construction according to claim 4, wherein: the concrete pouring process comprises the following steps: pouring from low to high in a layered mode from one end to the other end, pouring a longitudinal header beam at one time, and vertically pouring according to a bottom plate, a web plate and a top plate in sequence.
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