CN110528382B - Prestressed high-strength regenerated mixed continuous rigid frame bridge system and construction process - Google Patents
Prestressed high-strength regenerated mixed continuous rigid frame bridge system and construction process Download PDFInfo
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- CN110528382B CN110528382B CN201910926411.6A CN201910926411A CN110528382B CN 110528382 B CN110528382 B CN 110528382B CN 201910926411 A CN201910926411 A CN 201910926411A CN 110528382 B CN110528382 B CN 110528382B
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- 238000010276 construction Methods 0.000 title claims abstract description 54
- 238000000034 method Methods 0.000 title claims description 20
- 230000008569 process Effects 0.000 title claims description 15
- 239000002699 waste material Substances 0.000 claims abstract description 47
- 238000013461 design Methods 0.000 claims abstract description 12
- 230000008929 regeneration Effects 0.000 claims abstract description 10
- 238000011069 regeneration method Methods 0.000 claims abstract description 10
- 229910000831 Steel Inorganic materials 0.000 claims description 131
- 239000010959 steel Substances 0.000 claims description 131
- 238000004873 anchoring Methods 0.000 claims description 65
- 230000002787 reinforcement Effects 0.000 claims description 18
- 238000009434 installation Methods 0.000 claims description 16
- 238000004519 manufacturing process Methods 0.000 claims description 15
- 238000005259 measurement Methods 0.000 claims description 10
- 230000001172 regenerating effect Effects 0.000 claims description 8
- 230000003014 reinforcing effect Effects 0.000 claims description 8
- 238000005553 drilling Methods 0.000 claims description 6
- 238000012360 testing method Methods 0.000 claims description 6
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 5
- 238000009412 basement excavation Methods 0.000 claims description 3
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 230000036541 health Effects 0.000 claims description 3
- 239000002184 metal Substances 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 230000007613 environmental effect Effects 0.000 abstract description 4
- 238000004134 energy conservation Methods 0.000 abstract description 3
- 239000000463 material Substances 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 7
- 230000009471 action Effects 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- 238000005452 bending Methods 0.000 description 2
- 238000005266 casting Methods 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 230000004075 alteration Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000004566 building material Substances 0.000 description 1
- 230000009172 bursting Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
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- 230000004048 modification Effects 0.000 description 1
- 238000012216 screening Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
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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
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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
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D27/00—Foundations as substructures
- E02D27/10—Deep foundations
- E02D27/12—Pile foundations
- E02D27/14—Pile framings, i.e. piles assembled to form the substructure
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G21/00—Preparing, conveying, or working-up building materials or building elements in situ; Other devices or measures for constructional work
- E04G21/12—Mounting of reinforcing inserts; Prestressing
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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
- E01D2101/32—Metal prestressed
Abstract
The invention discloses a prestress high-strength regeneration mixed continuous rigid frame bridge system, which comprises a bridge body and a prestress system, wherein the bridge body comprises a pile foundation, a bearing platform, a bridge pier and a girder, the bearing platform is poured at the top of the pile foundation, the bridge pier is poured at the top of the bearing platform, the girder is poured at the top of the bridge pier, waste low-grade concrete and new high-grade concrete are alternately filled in the bridge pier and the bearing platform, the bridge pier and the bearing platform are fixedly connected through the prestress system, and the bridge pier and the girder are fixedly connected through the prestress system; according to the invention, the regenerated concrete is effectively utilized, the bridge support is eliminated, the integral design of the structure is optimized, the stress performance of the structure is improved, the material consumption is reduced, and the construction cost is reduced, so that the technical targets of high efficiency, energy conservation, advancement and environmental protection are realized.
Description
Technical Field
The invention relates to the technical field of recycling of waste concrete in traffic infrastructure industry, in particular to a prestressed high-strength regenerative hybrid continuous rigid frame bridge system and a construction process.
Background
The method combines the current low-carbon environmental protection concept, and can change waste concrete into valuable as a new trend in the engineering field. The project aims at the traditional traffic infrastructure industry, and in the construction of bridge engineering in the fields of expressways, high-speed railways, urban rail transit, municipal traffic and the like, the advanced design and construction concept of high-efficiency energy conservation, regeneration and environmental protection, namely a prestress high-strength regeneration mixed continuous rigid frame bridge system, is greatly developed. The continuous rigid frame system bridge is increasingly valued by domestic and foreign industry personnel due to the characteristics of high stress performance efficiency, good durability, good economy and the like, and the construction cost of bridge engineering is further reduced by the organic combination with waste concrete, so that the regeneration environment-friendly concept is embodied.
Disclosure of Invention
The invention aims to provide a prestress high-strength regeneration hybrid continuous rigid frame bridge system and a construction process, which are used for solving the problems in the background technology.
In order to achieve the above purpose, the present invention provides the following technical solutions: the utility model provides a prestressing force high strength regeneration mixes continuous rigid frame bridge system, includes bridge body and prestressing force system, the bridge body includes pile foundation, cushion cap, pier and girder, the cushion cap has been pour at the pile foundation top, the pier has been pour at the cushion cap top, the girder has been pour at the pier top, the pier with waste and old and useless low grade concrete and new high grade concrete have been filled in turn to the cushion cap inside, the pier with pass through prestressing force system fixed connection between the girder, the cushion cap with pass through prestressing force system fixed connection between the girder.
The waste low-grade concrete is waste concrete blocks after the whole or part of reinforcing steel bars are removed and removed from waste buildings, structures, bridges and roads.
Wherein the new high-grade concrete is natural aggregate concrete or recycled aggregate concrete, and the compressive strength of the new high-grade concrete is more than 50Mpa.
The prestress system comprises a prestress tensioning end steel cover plate, a prestress anchoring end steel cover plate, a prestress tensioning end shear plate, a prestress anchoring end shear plate, a prestress end spiral reinforcing steel bar, a prestress tensioning end anchor, a prestress anchoring end anchor, a prestress steel strand positioning device, a prestress steel strand corrugated pipe and a prestress steel strand.
The prestress tensioning end steel cover plate is arranged at the joint of the bridge pier at the top of the main beam and the main beam, and the bottom of the prestress tensioning end shear plate is used for reinforcing the connection between the prestress tensioning end steel cover plate and the main beam.
The prestress anchoring end steel cover plate is arranged at the bottom of the bearing platform, and the prestress anchoring end shear plate is used for reinforcing connection between the prestress anchoring end steel cover plate and the bottom of the bearing platform.
The prestress tensioning end anchor is arranged at the center of the lower surface of the prestress tensioning end steel cover plate, the prestress anchoring end anchor is arranged at the center of the upper surface of the prestress anchoring end steel cover plate, and prestress end spiral steel bars are arranged at the bottom of the prestress tensioning end anchor and the top of the prestress anchoring end anchor.
The prestress steel strand corrugated pipe is arranged in the bridge pier and the bearing platform, the prestress steel strand corrugated pipe is buried in the waste low-grade concrete and the new high-grade concrete, the prestress steel strand is inserted into the prestress steel strand corrugated pipe, the stretching end at the top of the prestress steel strand is anchored in the groove of the prestress stretching end steel cover plate, and the anchoring end at the bottom of the prestress steel strand is anchored in the groove of the prestress anchoring end steel cover plate.
The prestress steel strand corrugated pipe is made of metal or plastic, and the prestress steel strand is made of prestress 7 phi 5 steel strands with standard tensile strength of 1670/1860 Mpa.
The prestress steel strand positioning devices are arranged in two, and the two prestress steel strand positioning devices are uniformly arranged between the prestress steel strand corrugated pipes.
A construction process of a prestressed high-strength regenerative hybrid continuous rigid frame bridge system comprises the following steps:
s1, pile foundation construction: the construction is carried out according to a conventional pile foundation construction method, and the basic flow comprises leveling a site, setting out a pile position, positioning a drilling machine, drilling, forming holes of the pile foundation, installing a reinforcement cage, clearing the holes, testing the water tightness of a guide pipe, installing the guide pipe, pouring concrete, preserving health, digging and chiseling a pile head and checking the pile head;
s2, construction of a recycled concrete bearing platform and vertical prestress burying: the construction of the recycled concrete bearing platform is basically carried out according to the steps of excavation of a bearing platform foundation pit, manufacturing and installation of a reinforcement cage and concrete pouring and curing, the reinforcement cage manufacturing and installation links are to install a prestress anchoring end steel cover plate, a prestress anchoring end shear plate and a prestress anchoring end anchor in place in advance, and the concrete pouring and curing links are firstly to pour new high-grade concrete with the thickness of about 2cm on the prestress anchoring end steel cover plate at the bottom of the bearing platform, and secondly to pour fully wetted waste low-grade concrete into the bearing platform, and the volume of the new high-grade concrete and the waste low-grade concrete is 1:1, pouring and vibrating alternately in proportion until pouring is carried out to the top position of the bearing platform, and uniformly mixing the new high-grade concrete and the waste low-grade concrete into a whole;
s3, construction of the joint of the recycled concrete bridge pier and the pier beam: the construction of the joint of the recycled concrete pier and the pier beam is basically carried out according to the steps of template manufacture and installation, reinforcement cage manufacture and installation, concrete pouring and curing, wherein in the reinforcement cage manufacture and installation links, all components of a vertical prestress system are installed in place, and the recycled concrete pier comprises a prestress tensioning end steel cover plate, a prestress anchoring end steel cover plate, a prestress tensioning end shear plate, a prestress anchoring end shear plate, a prestress end spiral reinforcement, a prestress tensioning end anchor, a prestress anchoring end anchor, a prestress steel strand positioning device, a prestress steel strand corrugated pipe and a prestress steel strand, and in the concrete pouring and curing links, fully wetted waste low-grade concrete is poured into the pier, and according to the volume 1 of new high-grade concrete and waste low-grade concrete: 1, pouring and vibrating alternately until pouring is performed to the top of the girder at the joint of the bridge pier and the girder, wherein the uniform mixing of the new high-grade concrete and the waste low-grade concrete is ensured;
s4, vertical prestress tensioning construction: the vertical prestressing force is carried out according to two stages of prestressing and final stretching, the prestressing is carried out when the strength of the regenerated concrete reaches 60% of a design value, the pretension control force is 781.2Mpa, the final stretching is carried out after the strength of the regenerated concrete reaches 95% of the design value and the elastic modulus reaches 90% of the design value, the final stretching control force is 1302Mpa, pier and bearing platform templates are removed during prestressing, the compression of the piers and the bearing platforms is not hindered, the prestressing steel bundles must be subjected to stretching and anchoring tests before being used, and the stretching control stress is adjusted according to the actual measurement conditions of friction resistance coefficients and deviation coefficients of actual measurement pipelines, friction resistance losses of actual measurement anchor mouths and bell mouths so as to ensure the accuracy of prestressing;
s5, girder construction: after the construction of the joint of the recycled concrete pier and the pier beam and the vertical prestress tensioning are completed, the rest main beam sections of the continuous rigid frame are executed according to the conventional construction method, such as a bracket cast-in-situ or cantilever casting method, so that the construction of the continuous rigid frame bridge system is completed.
Compared with the prior art, the invention has the beneficial effects that:
1. according to the invention, the waste low-grade concrete and the new high-grade concrete are mixed for use, so that the treatment processes of crushing, screening, purifying and the like during recycling of the waste concrete are simplified, the waste concrete is more effectively utilized, and the engineering construction cost is reduced.
2. The bridge pier and the bearing platform are fixedly connected with the main girder through the vertical prestress system, the upper structure and the lower structure cooperate, the integral bending resistance and torsional rigidity of the bridge pier, the bearing platform and the main girder are greatly improved, the resistance of each part of the structure is uniformly and fully exerted, the forward bending rigidity of the main girder is increased, the crossing capacity is enhanced, the materials are fully utilized, and therefore a large amount of building materials are saved.
3. The invention does not need to use the support, and the continuous rigid frame bridge system without the support avoids the detection and maintenance work of a large number of supports in the later period of bridge operation, saves the cost of support installation and bridge maintenance, and prolongs the whole maintenance period of the bridge.
4. According to the invention, the regenerated concrete is effectively utilized, the bridge support is eliminated, the integral design of the structure is optimized, the stress performance of the structure is improved, the material consumption is reduced, and the construction cost is reduced, so that the technical targets of high efficiency, energy conservation, advancement and environmental protection are realized.
Drawings
FIG. 1 is a schematic diagram of the overall front view structure of the present invention;
FIG. 2 is a schematic diagram of the front view of the bridge pier and the bearing platform according to the present invention;
FIG. 3 is a schematic diagram of a front view of a prestress system for piers and caps according to the present invention;
FIG. 4 is a schematic diagram of a side view of the prestress system of the bridge pier and bearing platform according to the present invention;
FIG. 5 is a schematic diagram of the front view of the prestressing system of the present invention;
FIG. 6 is an enlarged schematic view of the portion A in FIG. 5;
FIG. 7 is a schematic diagram of a front view structure of a prestress tensioning end steel cover plate;
FIG. 8 is an enlarged view of the portion B of FIG. 5;
FIG. 9 is a schematic diagram of the front view of the prestress anchoring end steel cover plate of the invention.
In fig. 1-9: 100-bridge body; 110-pile foundation; 120-bearing platform; 130-pier; 131-waste low-grade concrete; 132-new high grade concrete; 140-main beams; 200-a pre-stressing system; 201-prestress tensioning end steel cover plate; 202-prestress anchoring an end steel cover plate; 203-prestress tensioning end shear plates; 204-prestress anchoring end shear plates; 205-prestress end spiral steel bars; 206-prestress tensioning end anchorage device; 207-prestress anchorage end anchorage; 208-a prestress steel strand positioning device; 209-prestress wire corrugated pipe; 210-prestress wire.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
Referring to fig. 1-9, the present invention provides a technical solution: the utility model provides a prestressing force high strength regeneration mixes continuous rigid frame bridge system, includes bridge body 100 and prestressing force system 200, bridge body 100 includes pile foundation 110, cushion cap 120, pier 130 and girder 140, cushion cap 120 has been pour at pile foundation 110 top, cushion cap 120 top has been pour pier 130, girder 140 has been pour at pier 130 top, pier 130 with the inside old and useless low-grade concrete 131 and the new high-grade concrete 132 of filling of cushion cap 120 in turn, pier 130 with through prestressing force system 200 fixed connection between the girder 140, through prestressing force system 200 fixed connection between cushion cap 120 and the girder 140.
The waste low-grade concrete 131 is a waste concrete block after removing all or part of the reinforcing steel bars of waste buildings, structures, bridges and roads.
Wherein the new high-grade concrete 132 is natural aggregate concrete or recycled aggregate concrete, and the compressive strength of the new high-grade concrete 132 is greater than 50Mpa.
The prestress system 200 comprises a prestress tension end steel cover plate 201, a prestress anchoring end steel cover plate 202, a prestress tension end shear plate 203, a prestress anchoring end shear plate 204, a prestress end spiral steel bar 205, a prestress tension end anchor 206, a prestress anchoring end anchor 207, a prestress steel strand positioning device 208, a prestress steel strand corrugated pipe 209 and a prestress steel strand 210.
The prestress tensioning end steel cover plate 201 is arranged at the joint of the bridge pier 130 at the top of the main beam 140 and the main beam 140, and the bottom of the prestress tensioning end shear plate 203 is used for reinforcing the connection between the prestress tensioning end steel cover plate 201 and the main beam 140.
The prestress anchoring end steel cover plate 202 is disposed at the bottom of the bearing platform 120, and the prestress anchoring end shear plate 204 is used for reinforcing connection between the prestress anchoring end steel cover plate 202 and the bottom of the bearing platform 120.
The prestress tensioning end anchor 206 is arranged at the center of the lower surface of the prestress tensioning end steel cover plate 201, the prestress anchoring end anchor 207 is arranged at the center of the upper surface of the prestress anchoring end steel cover plate 202, and prestress end spiral steel bars 205 are arranged at the bottom of the prestress tensioning end anchor 206 and at the top of the prestress anchoring end anchor 207.
The prestressed steel strand corrugated pipe 209 is arranged in the bridge pier 130 and the bearing platform 120, the prestressed steel strand corrugated pipe 209 is buried in the waste low-grade concrete 131 and the new high-grade concrete 132, the prestressed steel strand 210 is inserted into the prestressed steel strand corrugated pipe 209, the stretching end at the top of the prestressed steel strand 210 is anchored in the groove of the prestressed stretching end steel cover plate 201, and the anchoring end at the bottom of the prestressed steel strand 210 is anchored in the groove of the prestressed anchoring end steel cover plate 202.
Wherein, the prestress steel strand corrugated pipe 209 adopts a metal or plastic corrugated pipe, and the prestress steel strand 210 adopts a prestress 7 phi 5 steel strand with the standard tensile strength of 1670/1860 Mpa.
Wherein, two prestress wire positioning devices 208 are provided, and two prestress wire positioning devices 208 are uniformly arranged between the prestress wire bellows 209.
The prestress high-strength regeneration continuous rigid frame bridge system is characterized in that a bridge span is arranged as a 3X 30m continuous rigid frame, the height of a main girder 140 is 2.0m, and the width of the bridge is 9.0m; the double-thin-wall bridge pier 130 is adopted, the pier height is 12m, the pier width is 2.4-2.6 m, and the pier wall thickness is 0.7m; the dimension of the bearing platform 120 along the bridge direction x the transverse bridge direction x the thickness is 6.5 x 6.0 x 2.0m, and the pile diameter is 1.5m.
The bridge pier 130 and the pile body of the bearing platform 120 of the continuous rigid frame bridge are alternately poured with new high-grade concrete 132 with the strength grade of 60Mpa and waste low-grade concrete 131 with the strength grade of 20Mpa according to the mass ratio of 1:1, the actual measurement average value of the compressive strength after mixing is 38.04Mpa, the new high-grade concrete 132 is natural aggregate concrete, the waste low-grade concrete 131 is a waste concrete block after removing a waste bridge and removing reinforcing steel bars, and the characteristic size of the waste low-grade concrete 131 is 6-10 cm.
The prestress steel strand 210 in the vertical prestress system of the continuous rigid frame bridge pier and the bearing platform adopts prestress steel strands with the tensile standard strength of 1860Mpa and 15 prestress steel strands with 7 phi 5 as a bundle, and in the alternate pouring process of the waste low-grade concrete 131 and the new high-grade concrete 132 of the pile, the prestress steel strand 210 is well maintained in the linear shape, and the surface damage of the prestress steel strand 210 in the concrete pouring and vibrating process is avoided, and the outside of the prestress steel strand 210 is wrapped with the prestress steel strand corrugated pipe 209 with the inner diameter of 10cm.
In the alternate pouring process of the waste low-grade concrete 131 and the new high-grade concrete 132 of the continuous rigid frame bridge pier 130 and the bearing platform 120, the trend of the prestressed steel strand 210 in the pier 130 and the bearing platform 120 is effectively fixed through spot welding of the prestressed steel strand positioning device 208 and the longitudinal main stress steel bars of the pier 130, the linear deviation of the prestressed steel strand 210 is avoided, the prestressed tension end anchor 206 adopts an OVM 15-15 round anchor, the prestressed tension end anchor 207 adopts an OVM 15-15P round P type anchor, and in order to avoid the local bursting of the prestressed steel strand two end concrete at the bottom of the bearing platform 120 and the top of the main girder 140 in the prestressed tension anchoring process, the prestressed tension end anchor 206 and the prestressed tension end anchor 207 are respectively provided with a prestressed end spiral steel bar 205 with the diameter of 12 mm.
The top of the regenerative hybrid continuous rigid frame girder 140 and the prestressed end of the bottom of the bearing platform 120 are respectively provided with a prestressed tensile end steel cover plate 201 and a prestressed anchoring end steel cover plate 202, the prestressed tensile end steel cover plate 201 and the prestressed anchoring end steel cover plate 202 are made of Q235 steel, the diameter is 100cm, the thickness is 16cm, grooves are formed in the centers of the prestressed tensile end steel cover plate 201 and the prestressed anchoring end steel cover plate 202 and are used for prestress tensile or anchoring support, concrete collapse caused by insufficient local bearing of end concrete in the prestress tensile process is avoided, the lower surface of the prestressed tensile end steel cover plate 201 is provided with a prestressed tensile end shear plate 203, the bottom of the prestressed tensile end shear plate 203 is used for reinforcing the combination of the prestressed tensile end steel cover plate 201 and the top concrete of the girder 140, the upper surface of the prestressed anchoring end steel cover plate 202 is provided with a prestressed anchoring end shear plate 204, and the prestressed anchoring end steel cover plate 204 is used for reinforcing the combination of the prestressed anchoring end steel cover plate 202 and the bottom concrete of the bearing platform 120.
Further, the concrete construction method of the prestress high-strength regeneration mixed continuous rigid frame bridge can be summarized as the following basic flow: pile foundation 110 construction, recycled concrete bearing platform 120 construction, vertical prestress embedding, recycled concrete pier 130 construction at the joint of pier and girder, vertical prestress tensioning construction and girder 140 construction.
A construction process of a prestressed high-strength regenerative hybrid continuous rigid frame bridge system comprises the following steps:
s1, pile foundation 110 construction: the construction is carried out according to a conventional pile foundation 110 construction method, and the basic flow comprises leveling a site, setting out a pile position, positioning a drilling machine, drilling, forming holes of the pile foundation, installing a reinforcement cage, clearing holes, testing the water tightness of a guide pipe, installing the guide pipe, pouring concrete, preserving health, digging and chiseling a pile head and checking the pile head;
s2, constructing a recycled concrete bearing platform 120 and burying vertical prestress: the construction of the recycled concrete bearing platform 120 is basically carried out according to the foundation pit excavation, reinforcement cage manufacturing and installation, concrete pouring and curing steps of the bearing platform 120, the reinforcement cage manufacturing and installation links are to pre-install the prestress anchoring end steel cover plate 202, the prestress anchoring end shear plate 204 and the prestress anchoring end anchor 207 in place, and the concrete pouring and curing links are firstly to fill new high-grade concrete 132 with the thickness of about 2cm on the prestress anchoring end steel cover plate 202 at the bottom of the bearing platform 120, and secondly to fill fully wetted waste low-grade concrete 131 into the bearing platform 120, and the volume 1 of the new high-grade concrete 132 and the waste low-grade concrete 131 is calculated as follows: 1, pouring and vibrating alternately until pouring is carried out to the top position of the bearing platform 120, wherein the uniform mixing of the new high-grade concrete 132 and the waste low-grade concrete 131 is ensured to be integrated;
s3, construction of the joint of the recycled concrete bridge pier 130 and the pier beam: the construction of the joint of the recycled concrete pier 130 and the pier beam is basically carried out according to the steps of template manufacture and installation, reinforcement cage manufacture and installation, concrete pouring and curing, wherein in the reinforcement cage manufacture and installation links, all components of the vertical prestress system 200 are installed in place, and the construction method specifically comprises the steps of prestress tensioning end steel cover plate 201, prestress anchoring end steel cover plate 202, prestress tensioning end shear plate 203, prestress anchoring end shear plate 204, prestress end spiral reinforcement 205, prestress tensioning end anchor 206, prestress anchoring end anchor 207, prestress steel strand positioning device 208, prestress steel strand corrugated pipe 209 and prestress steel strand 210, and concrete pouring and curing links, wherein fully wetted waste low-grade concrete 131 is poured into the pier 130, and the volume 1 of the novel high-grade concrete 132 and waste low-grade concrete 131 is calculated: 1, pouring and vibrating alternately until pouring is performed to the top of the girder 140 at the joint of the bridge pier 130 and the girder 140, wherein the uniform mixing of the new high-grade concrete 132 and the waste low-grade concrete 131 is ensured;
s4, vertical prestress tensioning construction: the vertical prestressing is carried out according to two stages of prestressing and final stretching, the prestressing is carried out when the strength of the regenerated concrete reaches 60% of a design value, the pretension control force is 781.2Mpa, the final stretching is carried out after the strength of the regenerated concrete reaches 95% of the design value and the elastic modulus reaches 90% of the design value, the final stretching control force is 1302Mpa, templates of the bridge pier 130 and the bearing platform 120 are removed when the prestressing is carried out, the bridge pier 130 and the bearing platform 120 are not blocked by compression, the prestressing steel beam is required to be stretched and anchored for testing before being used, and the stretching control stress is adjusted according to the actual measurement conditions of the friction coefficient and the deviation coefficient of an actual measurement pipeline and the friction loss of an actual measurement anchor mouth and a bell mouth so as to ensure the accuracy of the prestressing;
s5, constructing a main beam 140: after the construction of the joint of the recycled concrete bridge pier 130 and the pier beam and the vertical prestress tensioning are completed, the rest main girder 140 sections of the continuous rigid frame are executed according to a conventional construction method, such as a bracket cast-in-situ or cantilever casting method, so that the construction of the continuous rigid frame bridge system is completed.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (5)
1. The utility model provides a prestressing force high strength regeneration mixes continuous rigid frame bridge system, includes bridge body (100) and prestressing force system (200), bridge body (100) include pile foundation (110), pier (120), cushion cap (130) and girder (140), pier (120) have been pour at pile foundation (110) top, cushion cap (130) have been pour at pier (120) top, girder (140) have been pour at cushion cap (130) top, its characterized in that: the bridge pier (120) and the bearing platform (130) are alternately filled with waste low-grade concrete (131) and new high-grade concrete (132), the bridge pier (120) and the bearing platform (130) are fixedly connected through the prestress system (200), and the bearing platform (130) and the main girder (140) are fixedly connected through the prestress system (200);
the waste low-grade concrete (131) is waste concrete blocks after removing all or part of reinforcing steel bars of waste buildings, structures, bridges and roads, the new high-grade concrete (132) is natural aggregate concrete or recycled aggregate concrete, and the compressive strength of the new high-grade concrete (132) is greater than 50Mpa;
the prestress system (200) comprises a prestress tensioning end steel cover plate (201), a prestress anchoring end steel cover plate (202), a prestress tensioning end shear plate (203), a prestress anchoring end shear plate (204), a prestress end spiral steel bar (205), a prestress tensioning end anchor (206), a prestress anchoring end anchor (207), a prestress steel strand positioning device (208), a prestress steel strand corrugated pipe (209) and a prestress steel strand (210);
the prestress tensioning end anchor (206) is arranged at the center of the lower surface of the prestress tensioning end steel cover plate (201), the prestress tensioning end anchor (207) is arranged at the center of the upper surface of the prestress tensioning end steel cover plate (202), and prestress end spiral steel bars (205) are arranged at the bottom of the prestress tensioning end anchor (206) and at the top of the prestress tensioning end anchor (207);
the prestress steel strand positioning device (208) is provided with two prestress steel strand positioning devices.
2. The prestressed high-strength regenerative hybrid continuous rigid frame bridge system of claim 1, wherein: the prestress tensioning end steel cover plate (201) is arranged at the joint of the bridge pier (120) at the top of the main beam (140) and the main beam (140), and the bottom of the prestress tensioning end shear plate (203) is used for reinforcing the connection between the prestress tensioning end steel cover plate (201) and the main beam (140).
3. The prestressed high-strength regenerative hybrid continuous rigid frame bridge system of claim 2, wherein: the prestress anchoring end steel cover plate (202) is arranged at the bottom of the bearing platform (130), and the prestress anchoring end shear plate (204) is used for reinforcing connection between the prestress anchoring end steel cover plate (202) and the bottom of the bearing platform (130).
4. The prestressed high-strength regenerative hybrid continuous rigid frame bridge system of claim 3, wherein: the prestress steel strand corrugated pipe (209) is arranged in the bridge pier (120) and the bearing platform (130), the prestress steel strand corrugated pipe (209) is buried in the waste low-grade concrete (131) and the new high-grade concrete (132), the prestress steel strand (210) is spliced in the prestress steel strand corrugated pipe (209), a tensioning end at the top of the prestress steel strand (210) is anchored in a groove of the prestress tensioning end steel cover plate (201), and an anchoring end at the bottom of the prestress steel strand (210) is anchored in a groove of the prestress anchoring end steel cover plate (202);
the prestress steel strand corrugated pipe (209) is made of metal or plastic, and the prestress steel strand (210) is made of prestress 7 phi 5 steel strands with standard tensile strength of 1670/1860 Mpa.
5. The construction process of the prestressed high-strength regenerative hybrid continuous rigid frame bridge system according to claim 4, which is characterized by comprising the following steps:
s1, pile foundation construction: the construction is carried out according to a conventional pile foundation construction method, and the basic flow comprises leveling a site, setting out a pile position, positioning a drilling machine, drilling, forming holes of the pile foundation, installing a reinforcement cage, clearing the holes, testing the water tightness of a guide pipe, installing the guide pipe, pouring concrete, preserving health, digging and chiseling a pile head and checking the pile head;
s2, construction of a recycled concrete bearing platform and vertical prestress burying: the construction of the recycled concrete bearing platform is basically carried out according to the steps of excavation of a bearing platform foundation pit, manufacturing and installation of a reinforcement cage and concrete pouring and curing, the reinforcement cage manufacturing and installation links are to install a prestress anchoring end steel cover plate, a prestress anchoring end shear plate and a prestress anchoring end anchor in place in advance, and the concrete pouring and curing links are firstly to pour new high-grade concrete with the thickness of 2cm on the prestress anchoring end steel cover plate at the bottom of the bearing platform, and secondly to pour fully wetted waste low-grade concrete into the bearing platform, wherein the volume of the new high-grade concrete and the waste low-grade concrete is 1:1, pouring and vibrating alternately in proportion until pouring is carried out to the top position of the bearing platform, and uniformly mixing the new high-grade concrete and the waste low-grade concrete into a whole;
s3, construction of the joint of the recycled concrete bridge pier and the pier beam: the construction of the joint of the recycled concrete pier and the pier beam is basically carried out according to the steps of template manufacture and installation, reinforcement cage manufacture and installation, concrete pouring and curing, wherein in the reinforcement cage manufacture and installation links, all components of a vertical prestress system are installed in place, and the recycled concrete pier comprises a prestress tensioning end steel cover plate, a prestress anchoring end steel cover plate, a prestress tensioning end shear plate, a prestress anchoring end shear plate, a prestress end spiral reinforcement, a prestress tensioning end anchor, a prestress anchoring end anchor, a prestress steel strand positioning device, a prestress steel strand corrugated pipe and a prestress steel strand, and in the concrete pouring and curing links, fully wetted waste low-grade concrete is poured into the pier, and according to the volume 1 of new high-grade concrete and waste low-grade concrete: 1, pouring and vibrating alternately until pouring is performed to the top of the girder at the joint of the bridge pier and the girder, wherein the uniform mixing of the new high-grade concrete and the waste low-grade concrete is ensured;
s4, vertical prestress tensioning construction: the vertical prestressing force is carried out according to two stages of prestressing and final stretching, the prestressing is carried out when the strength of the regenerated concrete reaches 60% of a design value, the pretension control force is 781.2Mpa, the final stretching is carried out after the strength of the regenerated concrete reaches 95% of the design value and the elastic modulus reaches 90% of the design value, the final stretching control force is 1302Mpa, pier and bearing platform templates are removed during prestressing, the compression of the piers and the bearing platforms is not hindered, the prestressing steel bundles must be subjected to stretching and anchoring tests before being used, and the stretching control stress is adjusted according to the actual measurement conditions of friction resistance coefficients and deviation coefficients of actual measurement pipelines, friction resistance losses of actual measurement anchor mouths and bell mouths so as to ensure the accuracy of prestressing;
s5, girder construction: after the construction of the joint of the recycled concrete pier and the pier beam and the vertical prestress tensioning are completed, the rest main beam sections of the continuous rigid frame are executed according to the conventional construction method, so that the construction of the continuous rigid frame bridge system is completed.
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