CN115125848A - Construction method of small-radius curve prefabricated plate beam - Google Patents
Construction method of small-radius curve prefabricated plate beam Download PDFInfo
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- CN115125848A CN115125848A CN202210724941.4A CN202210724941A CN115125848A CN 115125848 A CN115125848 A CN 115125848A CN 202210724941 A CN202210724941 A CN 202210724941A CN 115125848 A CN115125848 A CN 115125848A
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- 238000010276 construction Methods 0.000 title claims abstract description 46
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 80
- 239000010959 steel Substances 0.000 claims abstract description 80
- 239000004567 concrete Substances 0.000 claims abstract description 45
- 238000000034 method Methods 0.000 claims abstract description 4
- 229910001294 Reinforcing steel Inorganic materials 0.000 claims description 17
- 230000003014 reinforcing effect Effects 0.000 claims description 11
- 239000011384 asphalt concrete Substances 0.000 claims description 6
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 238000005507 spraying Methods 0.000 claims description 5
- 238000003466 welding Methods 0.000 claims description 2
- 238000005266 casting Methods 0.000 claims 1
- 238000000926 separation method Methods 0.000 abstract description 2
- 230000005484 gravity Effects 0.000 description 6
- 230000001808 coupling effect Effects 0.000 description 5
- 230000002787 reinforcement Effects 0.000 description 4
- 238000005452 bending Methods 0.000 description 3
- 238000009434 installation Methods 0.000 description 3
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000007493 shaping process Methods 0.000 description 2
- 238000009825 accumulation Methods 0.000 description 1
- 238000000418 atomic force spectrum Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 238000011900 installation process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000002407 reforming Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
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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
- E01D19/10—Railings; Protectors against smoke or gases, e.g. of locomotives; Maintenance travellers; Fastening of pipes or cables to bridges
- E01D19/103—Parapets, railings ; Guard barriers or road-bridges
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Abstract
The invention discloses a construction method of a small-radius curve prefabricated plate beam, wherein two ends of each prestressed curve prefabricated plate beam are respectively positioned and installed through bridge pier supports, a plurality of prestressed curve prefabricated plate beams are lifted and paved into a curve bridge cover surface, the support center line of the bridge pier supports and the beam center line of the prestressed curve prefabricated plate beams are eccentrically arranged, and the eccentric distance is a; concrete pile guardrails are poured on the inner sides of the circular arcs of the curved bridge cover surfaces, bent steel plate guardrails are installed on the outer sides of the circular arcs of the curved bridge cover surfaces, and the weight ratio between the bent steel plate guardrails and the concrete pile guardrails is 0.5-0.6: 1. by adopting the technical scheme, the counterforce of the inner side support and the outer side support tends to be balanced, and the phenomenon of bridge pier support separation caused by negative counterforce in the use process of the curved bridge can be avoided.
Description
Technical Field
The invention relates to the technical field of prefabricated plate beam engineering in an intercommunicating area, in particular to a construction method of a small-radius curve prefabricated plate beam.
Background
The curve beam bridge is widely applied to the prefabricated plate beam engineering in the intercommunication area due to the characteristics of economy and attractiveness, the curve beam bridge is opposite to the straight beam bridge, the stress is more complex, and the main stress characteristics are as follows: due to the curvature radius influence of the curved beam bridge, the internal torsion generated under the action of the load of the beam body is much larger, and the torsion can cause the deflection deformation of the beam body, so that the bending-torsion coupling effect of the beam body is obvious.
Firstly, a plurality of prestressed curve precast slab beams are all provided with a construction support at the central line position of the beam, the length of an inner arc web of each curve precast slab beam is smaller than that of an outer arc web, so that the section gravity center of each curve precast slab beam deflects to the outer arc side, the section gravity center of each curve precast slab beam can deflect to generate torque distributed along the length of the beam, and the smaller the curvature radius is, the more obvious the torque effect is generated; and secondly, in the load operation of the curved beam bridge, the carrier generates bending moment on the curved precast slab beam and simultaneously generates a bending-torsion coupling effect.
The curve beam bridge is influenced by the moment of torsion, in addition temperature and prestressing force, and the phenomenon that outside roof beam overloads, inboard roof beam uninstallation can appear in the curve beam bridge, leads to in the circular arc, outside support counter-force often to differ greatly when serious, and the accumulation is long-pending, finally can lead to the phenomenon that the support is vacated, influences the safe operation of curve beam bridge.
In the prior art, a device for limiting side movement and overturning of a curved beam bridge and a construction method thereof with the publication number of CN106592416B disclose that at least one side movement and overturning preventing unit is arranged between a box beam bottom and a bridge pier, and an internal component and an external component are mutually embedded and fixed through a rubber base plate, so that the box beam bottom is jointly limited from generating excessive side movement due to bending and twisting coupling force, and a beam body is prevented from overturning; the curve beam bridge is formed by hoisting and arranging a plurality of prestressed curve prefabricated plate beams, correspondingly installing the prestressed curve prefabricated plate beams on a support, hoisting the prestressed curve prefabricated plate beams to an installation position, arranging a side-shift-preventing and overturning-preventing unit between the prestressed curve prefabricated plate beams and the pier support, and connecting the side-shift-preventing and overturning-preventing unit inconveniently, so that the safety is poor, the specific installation position of the side-shift-preventing and overturning-preventing unit needs to be designed according to the prestressed curve prefabricated plate beams with different spans, and the construction difficulty is increased, therefore, the prior art is to be further improved and developed.
Disclosure of Invention
The invention aims to provide a construction method of a small-radius curve prefabricated plate beam, which is used for solving the problem that the safe operation of a curve beam bridge is influenced by the bending-torsion coupling effect.
The purpose of the invention can be realized by the following technical scheme:
a construction method of a small-radius curve prefabricated plate beam comprises the following specific construction steps:
designing and manufacturing a plurality of prestressed curve precast slab beams according to the bridge width and the curve radius;
step two, for newly-built bridge construction, setting a pier support according to the eccentric distance a between the support center line of the pier support and the beam center line of the prestressed curve prefabricated plate beam;
hoisting a plurality of prestressed curve prefabricated plate beams to the pier support through a crane, and positioning and mounting the prestressed curve prefabricated plate beams hole by hole;
fourthly, after the plurality of prestressed curve prefabricated plate beams are hoisted and paved into a curve bridge cover surface, integrally paving reinforcing steel bars on the curve bridge cover surface, and pouring concrete on the integrally paved reinforcing steel bars to form a bridge deck;
fifthly, pouring construction concrete pile guardrails on the inner sides of the arcs of the curved bridge cover surfaces, and constructing bent steel plate guardrails on the outer sides of the arcs of the curved bridge cover surfaces;
and sixthly, spraying a construction waterproof layer and paving an asphalt concrete layer on the bridge deck to finish the construction of the small-radius curve prefabricated plate girder.
As a further scheme of the invention: the weight ratio of the bent steel plate guardrail to the concrete pile guardrail in the fifth step is 0.5-0.6: 1.
as a further scheme of the invention: and in the first step, two ends of each prestress curve precast slab beam are pre-embedded with a plurality of horizontal reinforcing steel bars and a plurality of vertical reinforcing steel bars which extend outwards, and a reinforcing steel bar mesh is formed by carrying and welding the plurality of horizontal reinforcing steel bars and the plurality of vertical reinforcing steel bars.
As a further scheme of the invention: the concrete pile guardrail is formed by integrally pouring concrete piles and the reinforcing mesh.
As a further scheme of the invention: crooked steel sheet guardrail includes the concrete base, and integrative the pouring shaping between concrete base and the reinforcing bar net, pre-buried steel sheet that is provided with in the concrete base can be dismantled on the pre-buried steel sheet and connect many hollow steel pipes, and many hollow steel pipes are used for supporting to connect crooked steel sheet.
As a further scheme of the invention: and the embedded steel plates and the reinforcing mesh are welded and fixed.
As a further scheme of the invention: the bottom end of each hollow steel pipe is provided with a bottom steel plate, and the bottom steel plates are connected with the embedded steel plates through anchor rods.
As a further scheme of the invention: the bent steel plate is connected with the hollow steel pipe through a high-strength bolt.
As a further scheme of the invention: and in the second step, the eccentric direction of the support center line of the pier support faces the arc outer side of the curved bridge cover surface, and the numerical range of the eccentric distance a is 21.6cm-28.7 cm.
The invention has the beneficial effects that:
(1) in the installation process of the hoisting prestress curve precast slab beam, the prestress curve precast slab beam is eccentrically installed on a pier support, the section gravity center of the prestress curve precast slab beam is uniformly distributed along the pier support, the torque distributed along the beam length due to the deviation of the section gravity center of the curve precast slab beam is avoided, the pier support carries out eccentric torsion-resistant constraint on the prestress curve precast slab beam, the generated torsion-resistant coupling effect is reduced, the counter force of the support at the inner side and the outer side of the eccentric torsion-resistant constraint fulcrum tends to be balanced, and the phenomenon that the pier support is empty due to the occurrence of negative counter force in the use process of the curve bridge can be avoided;
(2) pour through the circular arc inboard of curve bridge capping and be equipped with concrete pile guardrail, crooked steel sheet guardrail is installed in the circular arc outside of curve bridge capping, the weight of crooked steel sheet guardrail will be less than the weight of concrete pile guardrail, curve bridge is in load operation use, the outer beam overload can appear in the curve bridge, the phenomenon of inboard roof beam uninstallation, lead to in the circular arc when serious, outside bearing counter-force often differs very greatly, through curve bridge capping circular arc outside weight, further distribute inside and outside bearing and tend to counter-force balance, the whole focus of curve bridge moves to the circular arc inboard, antidumping bearing capacity and factor of safety when improving the load operation.
(3) The curved steel plate guardrail comprises a concrete base and a reinforcing mesh, wherein the concrete base is integrally cast and formed, the concrete base is detachably connected with the hollow steel tubes through pre-buried steel plates, the hollow steel tubes are used for supporting and connecting the curved steel plates, the anti-collision impact strength of the curved steel plate guardrail integrally installed on the outer side of the circular arc of the cover surface of the curved bridge is guaranteed, the curved steel plates and the hollow steel tubes are detached, and the curved steel plates and the hollow steel tubes are convenient to overhaul and replace and convenient to construct.
Drawings
The invention will be further described with reference to the accompanying drawings.
FIG. 1 is a schematic cross-sectional mid-span view of an embodiment of the present invention;
FIG. 2 is a cross-sectional schematic view of a fulcrum in an embodiment of the invention;
FIG. 3 is a bridge floor plan in an embodiment of the present invention;
FIG. 4 is an enlarged schematic view of a circular inside concrete pile guard rail in an embodiment of the present invention;
figure 5 is an enlarged schematic view of a curved outside steel plate guardrail in an embodiment of the invention.
In the figure: 1. horizontal reinforcing steel bars; 2. vertical reinforcing steel bars; 3. concrete piles; 4. a concrete base; 5. pre-burying a steel plate; 6. a hollow steel pipe; 60. a bottom steel plate; 7. bending a steel plate; 8. an anchor rod; 9. a first anti-drop nut; 10. a high-strength bolt; 11. and a second anti-drop nut.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-5, the invention is a construction method of a small radius curve precast slab girder, two ends of each pre-stressed curve precast slab girder are respectively positioned and installed through pier supports, and a plurality of pre-stressed curve precast slab girders are hoisted and paved into a curve bridge capping, the support center line of the pier supports and the girder center line of the pre-stressed curve precast slab girders are eccentrically arranged, the eccentric distance is a, the support center line of the pier supports faces the outer side of the arc of the curve bridge capping, the numerical range of the eccentric distance a is 21.6cm-28.7cm, the pre-stressed curve precast slab girders are eccentrically installed on the pier supports, the section gravity centers of the pre-stressed curve precast slab girders are uniformly distributed along the pier supports, the torque distributed along the girder length due to the deviation of the section gravity centers of the curve precast slab girders is avoided, the pier supports perform eccentric torsion resistance restraint on the pre-stressed curve precast slab girders, therefore, the bending-torsion coupling effect is reduced, the reaction forces of the inner side support and the outer side support of the eccentric torsion-resistant constraint fulcrum tend to be balanced, and the phenomenon of bridge pier support separation caused by the negative reaction force in the use process of the curved bridge can be avoided.
Concrete pile guardrails are poured on the inner sides of the circular arcs of the curved bridge cover surfaces, bent steel plate guardrails are installed on the outer sides of the circular arcs of the curved bridge cover surfaces, and the weight ratio between the bent steel plate guardrails and the concrete pile guardrails is 0.5-0.6: 1, circular arc outside guardrail through reforming transform construction curve bridge capping, the crooked steel sheet guardrail of installation plays the crashproof impact and blocks the effect, and the weight of crooked steel sheet guardrail will be less than the weight of concrete pile guardrail, curve bridge is in load operation use, the outside roof beam overload can appear in the curve beam bridge, the phenomenon of inboard roof beam uninstallation, lead to in the circular arc when serious, outside support counter-force often differs very greatly, through curve bridge capping circular arc outside weight, further distribute inside and outside counter-force and tend to balance, the whole focus of curve beam bridge moves to the circular arc inboard, antidumping bearing capacity and factor of safety when improving the load operation.
The both ends of every prestressing force curve prefabricated plate roof beam all pre-buried horizontal reinforcement 1 and the vertical reinforcement 2 that are equipped with many outside stretches out, carry on between many horizontal reinforcement 1 and the vertical reinforcement 2 and weld and form the reinforcing bar net.
Concrete pile guardrail passes through between 3 and the reinforcing bar net of concrete pile and pours the shaping integratively for the inboard integrative concrete pile guardrail crashproof impact strength increase of pouring of circular arc of curvilinear bridge capping.
The bent steel plate guardrail comprises a concrete base 4, the concrete base 4 and a reinforcing mesh are integrally cast and molded, an embedded steel plate 5 is embedded in the concrete base 4, the embedded steel plate 5 and a reinforcing mesh are welded and fixed, a plurality of hollow steel pipes 6 are detachably connected to the embedded steel plate 5, a bottom steel plate 60 is integrally arranged at the bottom ends of the hollow steel pipes 6, the bottom steel plate 60 is connected with the embedded steel plate 5 through an anchor rod 8, the top end of the anchor rod 8 is in threaded connection with a first anti-falling nut 9, the hollow steel pipes 6 are used for supporting and connecting a bent steel plate 7, the bent steel plate 7 is connected with the hollow steel pipes 6 through high-strength bolts 10, the high-strength bolts 10 are in threaded connection with a second anti-falling nut 11, the anti-collision impact strength of the curved steel plate guardrail integrally installed on the outer side of the arc of the curved bridge cover surface is increased, and the installed curved steel plate 7 and the hollow steel pipe 6 are detached and convenient to overhaul and replace.
The curved bridge deck is paved with a bridge deck, a waterproof layer and an asphalt concrete layer from bottom to top.
Example 1
A construction method of a small-radius curve prefabricated plate beam comprises the following specific construction steps:
designing and manufacturing a plurality of prestressed curve prefabricated plate beams according to the bridge width of 10.5m and the curve radius R of 65m, wherein the height of each prestressed curve prefabricated plate beam is 0.8m, and the beam width is 1.2 m;
step two, for newly-built bridge construction, arranging pier supports according to the eccentric distance of 28.7cm between the support center line of the pier supports and the beam center line of the prestressed curve prefabricated plate beam;
hoisting a plurality of prestressed curve prefabricated plate beams to the pier support through a crane, and positioning and mounting the prestressed curve prefabricated plate beams hole by hole;
fourthly, after the plurality of prestressed curve precast slab beams are lifted and paved into a curved bridge cover surface, integrally paving reinforcing steel bars on the curved bridge cover surface, and performing cast-in-place concrete on the integrally paved reinforcing steel bars to form a bridge deck;
fifthly, pouring a concrete pile guardrail on the inner side of the arc of the curved bridge capping surface, and constructing a bent steel plate guardrail on the outer side of the arc of the curved bridge capping surface, wherein the weight ratio of the bent steel plate guardrail to the concrete pile guardrail is 0.5: 1;
and sixthly, spraying a construction waterproof layer and paving an asphalt concrete layer on the bridge deck to complete the construction of the small-radius curve prefabricated plate girder.
Example 2
A construction method of a small-radius curve precast slab beam comprises the following specific construction steps:
designing and manufacturing a plurality of prestressed curve precast slab beams according to the bridge width of 10.5m and the curve radius R of 75m, wherein the height of each prestressed curve precast slab beam is 0.8m, and the beam width is 1.2 m;
step two, for newly-built bridge construction, arranging pier supports according to the eccentric distance of 24.8cm between the support center line of the pier supports and the beam center line of the prestressed curve prefabricated plate beam;
hoisting a plurality of prestressed curve prefabricated plate beams to the pier support through a crane, and positioning and mounting the prestressed curve prefabricated plate beams hole by hole;
fourthly, after the plurality of prestressed curve prefabricated plate beams are hoisted and paved into a curve bridge cover surface, integrally paving reinforcing steel bars on the curve bridge cover surface, and pouring concrete on the integrally paved reinforcing steel bars to form a bridge deck;
fifthly, pouring construction concrete pile guardrails on the inner sides of the circular arcs of the curved bridge cover surfaces, constructing bent steel plate guardrails on the outer sides of the circular arcs of the curved bridge cover surfaces, wherein the weight ratio of the bent steel plate guardrails to the concrete pile guardrails is 0.55: 1;
and sixthly, spraying a construction waterproof layer and paving an asphalt concrete layer on the bridge deck to finish the construction of the small-radius curve prefabricated plate girder.
Example 3
A construction method of a small-radius curve prefabricated plate beam comprises the following specific construction steps:
designing and manufacturing a plurality of prestressed curve precast slab beams according to the bridge width of 10.5m and the curve radius R of 85m, wherein the height of each prestressed curve precast slab beam is 0.8m, and the beam width is 1.2 m;
step two, for newly-built bridge construction, arranging pier supports according to the eccentric distance of 21.6cm between the support center line of the pier supports and the beam center line of the prestressed curve prefabricated plate beam;
hoisting a plurality of prestressed curve precast slab beams to the pier supports through a crane, and positioning and mounting the prestressed curve precast slab beams hole by hole;
fourthly, after the plurality of prestressed curve prefabricated plate beams are hoisted and paved into a curve bridge cover surface, integrally paving reinforcing steel bars on the curve bridge cover surface, and pouring concrete on the integrally paved reinforcing steel bars to form a bridge deck;
fifthly, pouring construction concrete pile guardrails on the inner sides of the circular arcs of the curved bridge cover surfaces, constructing bent steel plate guardrails on the outer sides of the circular arcs of the curved bridge cover surfaces, wherein the weight ratio of the bent steel plate guardrails to the concrete pile guardrails is 0.6: 1;
and sixthly, spraying a construction waterproof layer and paving an asphalt concrete layer on the bridge deck to finish the construction of the small-radius curve prefabricated plate girder.
While one embodiment of the present invention has been described in detail, the description is only a preferred embodiment of the present invention and should not be taken as limiting the scope of the invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.
Claims (9)
1. A construction method of a small-radius curve precast slab beam is characterized in that,
the concrete construction steps are as follows:
designing and manufacturing a plurality of prestressed curve precast slab beams according to the bridge width and the curve radius;
step two, for newly-built bridge construction, setting a pier support according to the eccentric distance a between the support center line of the pier support and the beam center line of the prestressed curve prefabricated plate beam;
hoisting a plurality of prestressed curve precast slab beams to the pier supports through a crane, and positioning and mounting the prestressed curve precast slab beams hole by hole;
fourthly, after the plurality of prestressed curve prefabricated plate beams are hoisted and paved into a curve bridge cover surface, integrally paving reinforcing steel bars on the curve bridge cover surface, and pouring concrete on the integrally paved reinforcing steel bars to form a bridge deck;
fifthly, pouring construction concrete pile guardrails on the inner sides of the arcs of the curved bridge cover surfaces, and constructing bent steel plate guardrails on the outer sides of the arcs of the curved bridge cover surfaces;
and sixthly, spraying a construction waterproof layer and paving an asphalt concrete layer on the bridge deck to finish the construction of the small-radius curve prefabricated plate girder.
2. The construction method of the small radius curve precast slab beam as set forth in claim 1, wherein the weight ratio between the curved steel plate guard rail and the concrete pile guard rail in the fifth step is 0.5-0.6: 1.
3. the construction method of the small-radius curve precast slab beam as claimed in claim 1, wherein a plurality of horizontal steel bars and vertical steel bars extending outwards are embedded at both ends of each prestressed curve precast slab beam in the first step, and a steel bar mesh is formed by carrying and welding the horizontal steel bars and the vertical steel bars.
4. The method for constructing a small-radius curve precast slab beam as claimed in claim 3, wherein the concrete pile guard rail is formed by integrally casting the concrete pile and the reinforcing mesh.
5. The construction method of the small-radius curve precast slab beam as claimed in claim 3, wherein the curved steel plate guardrail comprises a concrete base, the concrete base and the reinforcing mesh are integrally cast, an embedded steel plate is embedded in the concrete base, a plurality of hollow steel pipes are detachably connected to the embedded steel plate, and the plurality of hollow steel pipes are used for supporting and connecting the curved steel plate.
6. The construction method of the small-radius curve precast slab beam as claimed in claim 5, wherein the pre-buried steel plates and the reinforcing mesh are welded and fixed.
7. The construction method of the small-radius curve precast slab beam as claimed in claim 5, wherein bottom steel plates are integrally arranged at the bottom ends of the plurality of hollow steel pipes, and the bottom steel plates are connected with the embedded steel plates through anchor rods.
8. The construction method of the small-radius curve precast slab beam as claimed in claim 5, wherein the bent steel plate and the hollow steel pipe are connected by a high strength bolt.
9. The construction method of the small-radius curve precast slab beam as claimed in claim 1, wherein in the second step, the support center line of the pier support faces the outer side of the arc of the curved bridge deck in the eccentric direction, and the eccentric distance a ranges from 21.6cm to 28.7 cm.
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Application publication date: 20220930 |