CN108978434B - Bracket-free industrialized construction method of steel-concrete combined continuous box girder bridge - Google Patents
Bracket-free industrialized construction method of steel-concrete combined continuous box girder bridge Download PDFInfo
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- CN108978434B CN108978434B CN201811201608.5A CN201811201608A CN108978434B CN 108978434 B CN108978434 B CN 108978434B CN 201811201608 A CN201811201608 A CN 201811201608A CN 108978434 B CN108978434 B CN 108978434B
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- 239000004567 concrete Substances 0.000 title claims abstract description 104
- 238000010276 construction Methods 0.000 title claims description 28
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 115
- 239000010959 steel Substances 0.000 claims abstract description 115
- 238000003466 welding Methods 0.000 claims abstract description 11
- 239000011178 precast concrete Substances 0.000 claims description 12
- 239000004568 cement Substances 0.000 claims description 7
- 238000005266 casting Methods 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 20
- 230000008901 benefit Effects 0.000 abstract description 8
- 238000009439 industrial construction Methods 0.000 abstract description 3
- 239000002131 composite material Substances 0.000 description 8
- 238000005336 cracking Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 230000002787 reinforcement Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 238000011065 in-situ storage Methods 0.000 description 2
- 238000011068 loading method Methods 0.000 description 2
- 229910001294 Reinforcing steel Inorganic materials 0.000 description 1
- 230000002411 adverse Effects 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000009417 prefabrication Methods 0.000 description 1
- 230000009291 secondary effect Effects 0.000 description 1
- 239000002002 slurry Substances 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
- E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
- E01D2/04—Bridges characterised by the cross-section of their bearing spanning structure of the box-girder type
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/02—Piers; Abutments ; Protecting same against drifting ice
-
- 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
-
- 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
- E01D2101/268—Composite concrete-metal
Abstract
The invention discloses a novel steel-concrete combined continuous box girder bridge, which comprises bearing platforms and piers, wherein the bearing platforms are cast at intervals, the piers are fixed on each bearing platform, the tops of each pier are provided with supports, and a steel-concrete combined box girder segment is erected between two adjacent supports; the top of each support is provided with a steel box girder segment in a hoisting way, the joint part of the steel-concrete combined box girder segment and the steel box girder segment is provided with a web plate and a bottom plate which adopt a high-strength bolt and double-sided splice plate fillet welding connection structure, and the top plate is connected with a steel grid structure filled with concrete. The invention also discloses a bracket-free industrial construction method of the bridge. The integral bridge has reasonable structure, main structural members can be prefabricated in advance, assembled on site and constructed quickly on site, and accords with the development trend of industrial construction of the bridge; the pier top adopts the steel box girder, the integral bridge has the structural advantages of the steel-concrete combined continuous box girder bridge, and the problem that the stress of the hogging moment area near the fulcrum of the steel-concrete combined continuous box girder bridge is unreasonable can be effectively solved.
Description
Technical Field
The invention relates to the technical field of highways and urban roads and bridges, in particular to a novel steel-concrete combined continuous box girder bridge, and further relates to a bracket-free industrialized construction method of the bridge.
Background
The steel-concrete combined box girder is a novel girder structure developed on the basis of a steel structure and a concrete structure. The upper part of the steel-concrete combined box girder structure is composed of concrete plates, the lower part of the steel-concrete combined box girder structure is composed of steel box girders, and the joint of the steel-concrete combined box girder structure and the steel box girders is formed by connecting shear connectors such as shear nails. In the section of the combined beam, the concrete slab is mainly pressed, the steel box beam is mainly pulled, and the respective advantages of two materials of steel and concrete can be fully and reasonably exerted, compared with a steel bridge, the combined beam has the advantages of saving steel, reducing building height, improving stability and integrity, reducing impact coefficient, having high fatigue resistance, reducing steel beam corrosion, reducing noise, reducing maintenance workload and the like; compared with a concrete bridge, the concrete bridge has the advantages of small dead weight, good earthquake resistance, high industrialization degree, less field operation, high construction speed, short construction period and the like. Under the large background that the surplus steel productivity and the wide environmental protection problem of our country are paid attention to at present, the steel-concrete combined box girder gradually becomes a development trend due to the advantages of economy, structural reliability, construction convenience and the like.
However, in actual use, the steel-concrete composite continuous box girder bridge has the defects that concrete is pulled and steel girders are pressed in a hogging moment area near a fulcrum, and the concrete bridge deck has larger tensile stress and is extremely easy to crack under the actions of load, temperature difference and shrinkage creep, so that the rigidity and durability of the composite box girder are reduced. At present, in order to control the cracking of the concrete bridge deck, measures such as a pre-loading method, a support pre-jacking method, a bridge deck sectional pouring method, a precast concrete bridge deck method, a reinforcement limit concrete crack width method, a prestress application method and the like are generally adopted. The pre-loading method, the support pre-jacking method, the bridge deck slab sectional pouring method and the precast concrete bridge deck slab method are used for generating favorable secondary internal force by a construction means, improving the unstressed length of the bridge deck slab or reducing shrinkage creep of the bridge deck slab, but the construction procedures of the methods are complex and the stress is not clear enough, so that the method is not adopted or only used as an auxiliary measure generally; the reinforcement limiting concrete crack width method and the prestress applying method are methods which are applied more in the current engineering, and the reinforcement limiting concrete crack width method controls the cracking of the concrete slab by arranging enough reinforcing steel bars in the concrete slab in the hogging moment area so as to limit the crack width of the concrete slab within an allowable value, but the method only plays a role in controlling and improving and cannot completely avoid the cracking of the bridge deck; the prestress application method is characterized in that prestress steel bundles are arranged in a concrete slab in a hogging moment area of a fulcrum of a combined beam structure, a certain compressive stress is provided for a concrete bridge deck, so that the tensile stress of concrete near the fulcrum is effectively controlled, the concrete at the fulcrum is kept in a pressed state to a certain extent, and the bridge deck is prevented from cracking, but the steel bundles needing to be arranged are relatively dense, part of the steel bundles are far away from a web plate, the prestress hysteresis effect provided by the steel bundles on a box girder is obvious, the stress generated by the secondary effect of the steel bundles is large, and the use efficiency of the steel bundles is low; in addition, the longitudinal and transverse prestress steel bundles are densely arranged with common steel bars, the construction is complex, the vibration is difficult, the concrete pouring quality is poor, and the expected technical effect is difficult to achieve.
Disclosure of Invention
The invention aims to provide a novel steel-concrete combined continuous box girder bridge, and also provides a bracket-free industrialized construction method of the bridge, aiming at the defects that the structural stress of a hogging moment area near a fulcrum of the traditional steel-concrete combined continuous box girder bridge is unreasonable and the crack control measure of a bridge deck plate of the traditional hogging moment area is not enough.
In order to achieve the above purpose, the present invention may adopt the following technical scheme:
the invention relates to a novel steel-concrete combined continuous box girder bridge, which comprises bearing platforms which are cast at intervals and bridge piers which are fixedly arranged on each bearing platform, wherein the top of each bridge pier is provided with a support, and a steel-concrete combined box girder segment is arranged between two adjacent supports; and steel box girder sections are hoisted at the top of each support, the joint parts of the steel-concrete combined box girder sections and the steel box girder sections are provided with web plates and bottom plates which adopt high-strength bolts and double-sided splice plates for fillet welding connection, and top plates of the web plates are connected with steel grid structures filled with concrete.
The fillet welding connection structure of the high-strength bolt and the double-sided splice plate comprises splice steel plates clamped at two sides of the joint of the steel-concrete combined box girder segment and the web plate or the bottom plate of the steel box girder segment, wherein the splice steel plates are provided with connecting holes at intervals, and the high-strength connecting bolts are inserted into the connecting holes; the periphery of the spliced steel plate and the web plate or the bottom plate are welded into a whole through fillet welding.
The connection between the bearing platform and the pier adopts a connection mode of grouting sleeve and post-pouring high-strength shrinkage-free cement paste: when the bearing platform is poured, the embedded bars extend out of the top of the bearing platform; when prefabricating the pier, embedding the grouting sleeve at the bottom of the pier; and during splicing, the embedded bars at the top of the bearing platform are inserted into the grouting sleeve at the bottom of the pier, and high-strength non-shrinkage cement paste is poured into the grouting sleeve to form the whole of the bearing platform and the pier.
The bracket-free industrialized construction method of the novel steel-concrete combined continuous box girder bridge comprises the following steps:
firstly, prefabricating concrete bridge decks and channel-shaped steel beams in bridge piers, steel box girder sections and steel-concrete combined box girder sections; a steel grid chamber welded with a stud is arranged at the joint of the top plates of the steel box girder sections; a post-pouring reserved groove is formed in the precast concrete bridge deck, and a connecting bolt matched with the post-pouring reserved groove is arranged at the top of the channel-shaped steel beam;
constructing a pile foundation bearing platform, hoisting the prefabricated pier to be in place and installing a support;
hoisting the steel box girder segments to the support saddle at the top of each bridge pier in sequence; hoisting the channel-shaped steel beams in the steel-concrete combined box girder sections between two adjacent supports, and completing the connection of the web plates and the bottom plates between the steel box girder sections and the channel-shaped steel beams by adopting a high-strength bolt and double-sided splice plate fillet welding connection structure after adjustment; and finally, splicing prefabricated concrete bridge deck plates, pouring wet joints of bridge deck plates and steel lattice chamber concrete, and completing the integral construction of the steel-concrete combined continuous box girder bridge.
The invention has the advantages that the integral bridge has reasonable structure, main structural members can be prefabricated in advance, assembled on site and constructed on site with high speed, and accords with the development trend of industrial construction of the bridge; the pier top (hogging moment area) adopts the steel box girder, so that the whole bridge not only has the structural advantage of the steel-concrete combined continuous box girder bridge, but also can effectively solve the problem that the hogging moment area near the fulcrum of the steel-concrete combined continuous box girder bridge is unreasonable in stress. Specifically:
1) The economy is good, the consumption of the bracket and the template is reduced, the construction is convenient, and the construction cost is saved;
2) The top plate of the pier top hogging moment area adopts steel materials (each pier top adopts a steel box girder segment), the tension performance of the steel materials is fully utilized, a plurality of adverse effects caused by arranging the pier top prestress steel bundles are avoided, and the problem of cracking of the pier top concrete of the steel-concrete composite girder is fundamentally solved;
3) The prefabricated construction technology is adopted, so that the development trend of bridge construction industrialization is met; the main structural member is cast and maintained in a prefabricated field, so that the construction quality can be effectively ensured; the on-site concrete pouring workload is small, the construction progress is fast, and the construction period is effectively shortened;
4) The social benefit is good, the energy is saved, the consumption is reduced, the environment is protected, and the environmental pollution is less; the road under the bridge is continuously operated in the construction process, so that the influence on the existing traffic is small.
Drawings
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a cross-sectional view of the steel box girder segment of fig. 1.
Fig. 3 is a cross-sectional view of the steel-concrete composite box girder segment of fig. 1.
Fig. 4a is a cross-sectional view of the precast concrete deck of fig. 3.
Fig. 4b is a top view of fig. 4 a.
Fig. 5a is a cross-sectional view of the prefabricated channel steel beam of fig. 3.
Fig. 5b is a top view of fig. 5 a.
Fig. 6 is an elevation view of the connection of the steel box girder segment of fig. 1 to a steel-concrete composite box girder segment.
Fig. 7 is a cross-sectional view of the connection of the steel box girder segment and the steel-concrete composite box girder segment of fig. 1.
Fig. 8 is an enlarged view of the web and floor of the junction of the steel box girder segment and the steel-concrete composite box girder segment of fig. 1.
Fig. 9 is a sectional view of the bridge pier of fig. 1.
Fig. 10 to 14 are construction process diagrams of the present invention.
Detailed Description
As shown in fig. 1, the novel steel-concrete combined continuous box girder bridge comprises bearing platforms 1 which are cast at intervals and bridge piers 2 which are fixedly arranged on each bearing platform 1, wherein a support 3 is arranged at the top of each bridge pier 2, and a steel-concrete combined box girder segment 4 is arranged between two adjacent supports 3; the top of each support 3 is provided with a steel box girder segment 5 in a hoisting mode, a high-strength bolt and double-sided splice plate fillet welding connection structure is adopted between a web plate and a bottom plate at the joint position of the steel-concrete combined box girder segment 4 and the steel box girder segment 5, and a steel grid structure filled with concrete is adopted for top plate connection.
The cross-sectional structure of the steel box girder segment 5 used in the invention is shown in fig. 2, and the cross-sectional structure of the steel-concrete combined box girder segment 4 is shown in fig. 3;
the steel-concrete combined box girder segment 4 is formed by splicing a precast concrete bridge deck 4.1 (shown in fig. 4a and 4 b) and a precast groove-shaped steel girder 4.2 (shown in fig. 5a and 5 b), a post-cast reserved groove 4.3 is reserved on the precast concrete bridge deck 4.1, and connecting bolts 4.4 are welded on the precast groove-shaped steel girder 4.2. The joint adopts the connection mode of peg + post-cast concrete: the connecting studs 4.4 of the prefabricated groove-shaped steel beams 4.2 are extended into the post-pouring reserved grooves 4.3 of the prefabricated concrete bridge deck 4.1, and then micro-expansion concrete is cast in situ in the post-pouring reserved grooves 4.3 to form the integral steel-concrete combined box girder segment 4.
As shown in fig. 6, when prefabricating the steel box girder segments 5, steel cells 5.2 welded with studs 5.1 are provided at the top plate joints thereof. When the steel box girder segment 5 and the steel-concrete combined box girder segment 4 are assembled, concrete in the steel grid chamber 5.2 is cast in place, and the top plates of the steel box girder segment 5 and the steel-concrete combined box girder segment 4 are connected into a whole through the bolts 5.1 in the steel grid chamber 5.2 and the cast concrete; the connection between the steel box girder segment 5 and the web plate and the bottom plate of the steel-hybrid combined box girder segment 4 adopts a high-strength bolt and double-sided splice plate fillet weld connection structure 6, and the concrete connection mode is as shown in fig. 8: when the steel box girder segment 5 and the web plate and the bottom plate of the steel-concrete combined box girder segment 4 are assembled, splicing steel plates 6.1 are added to two sides of the joint of the web plate and the bottom plate, connecting holes are formed in the splicing steel plates 6.1 at intervals, and high-strength connecting bolts 6.2 are inserted into the connecting holes; the periphery of the spliced steel plate 6.1 is welded with the web/bottom plate into a whole by fillet welds 6.3. The structure of the assembled steel box girder segment 5 and the steel-hybrid composite box girder segment 4 is shown in fig. 7.
The connection between the bearing platform 1 and the bridge pier 2 (prefabricated in advance) can adopt a connection form of grouting sleeve and post-pouring high-strength shrinkage-free cement slurry, as shown in fig. 9: when the bearing platform 1 is poured, the embedded steel bars 1.1 extend out of the top of the bearing platform 1, the grouting sleeve 2.1 is embedded in the bottom of the pier 2 when the pier 2 is prefabricated, the embedded steel bars 1.1 are inserted into the grouting sleeve 2.1 when the pier 2 is spliced, and high-strength non-shrinkage cement paste is poured into the grouting sleeve 2.1 to form a whole.
The novel bracket-free industrialized construction method of the steel-concrete combined continuous box girder bridge comprises the following steps:
firstly, prefabricating piers 2 and concrete bridge decks 4.1 (post-pouring reserved grooves 4.3 are reserved on the concrete bridge decks 4.1) in a prefabrication field, and storing and maintaining; manufacturing a groove-shaped steel beam 4.2 (connecting bolts 4.4 are welded on the groove-shaped steel beam 4.2) and a steel box girder segment 5 (when the steel box girder segment 5 is prefabricated, a steel grid chamber 5.2 welded with bolts 5.1 is arranged at the joint of a top plate of the steel box girder segment 5);
secondly, constructing the bearing platform 1 by adopting a conventional method, wherein the embedded bars 1.1 extend upwards from the top of the bearing platform 1; hoisting the prefabricated bridge pier 2 to position, adjusting the position, inserting the embedded steel bars 1.1 on the bearing platform 1 into the grouting sleeve 2.1 embedded at the bottom of the bridge pier 2, and pouring high-strength non-shrinkage cement paste into the grouting sleeve 2.1 to form an integral structure; then installing a support 3 at the top of the bridge pier 2; hoisting the steel box girder segment 5 to the support 3 by using a bridge girder erection machine 7 (or a crane), as shown in fig. 10 and 11;
thirdly, as shown in fig. 12, a bridge girder erection machine 7 (or a crane) is adopted to hoist the prefabricated groove-shaped steel girder 4.2 in place, the position is adjusted, and the steel box girder segment 5 is locked by a suspender 8, and the web plate and the bottom plate of the groove-shaped steel girder 4.2 are connected by adopting a high-strength bolt and double-sided splice plate fillet welding connection structure 6 as shown in fig. 8: splicing steel plates 6.1 are added at two sides of the web plate/bottom plate joint, connecting holes are formed in the splicing steel plates 6.1 at intervals, and high-strength connecting bolts 6.2 are inserted into the connecting holes; the periphery of the spliced steel plate 6.1 is welded with the web plate/bottom plate into a whole through a fillet weld 6.3;
fourth, as shown in fig. 13, the precast concrete deck 4.1 is hoisted in place, the position is adjusted, and the precast concrete deck 4.1 and the precast channel steel beam 4.2 are connected: the connecting mode of the stud and post-pouring concrete is adopted, the connecting stud 4.4 on the prefabricated groove-shaped steel beam 4.2 stretches into the post-pouring reserved groove 4.3 of the concrete bridge deck 4.1, and then the micro-expansion concrete is cast in situ in the post-pouring reserved groove 4.3 to form a whole. At the same time, a concrete filled steel cell structure is used to connect the steel box girder segments 5 and the concrete bridge deck 4.1: concrete is cast in place in the steel grid chambers 5.2 at the joints of the top plates of the steel box girder segments 5, and the top plates are connected into a whole through the bolts 5.1 in the steel grid chambers and the cast concrete. Pouring bridge deck wet joint concrete and curing the concrete, and removing the suspender 8 after the concrete strength reaches the requirement to finish the construction of the hole steel-concrete combined continuous box girder;
and fifthly, as shown in fig. 14, hoisting the next hole groove-shaped steel beam 4.2, locking by using a suspender 8, and repeating the third and fourth steps to form the multi-span steel-concrete combined continuous box girder bridge.
Claims (3)
1. The utility model provides a no support industrialization construction method of steel-thoughtlessly make up continuous box girder bridge, steel-thoughtlessly make up continuous box girder bridge including the cushion cap of interval pouring and the pier of fixed laying on every cushion cap, the support is all installed at the top of every pier, has set up steel-thoughtlessly make up box girder segment between two adjacent supports, its characterized in that: a steel box girder segment is hoisted at the top of each support, the joint part of the steel-concrete combined box girder segment and the steel box girder segment is formed by adopting a high-strength bolt and a double-sided splice plate fillet welding connection structure as a web plate and a bottom plate, and adopting a steel grid structure filled with concrete as a top plate connection;
the steel-concrete combined box girder segment is formed by splicing a precast concrete bridge deck and a precast groove-shaped steel girder, a post-pouring reserved groove is reserved on the precast concrete bridge deck, connecting studs are welded on the precast groove-shaped steel girder, and a connecting mode of studs and post-pouring concrete is adopted at the splicing position: extending connecting studs of the prefabricated groove-shaped steel beams into post-pouring reserved grooves of the precast concrete bridge deck, and then casting micro-expansion concrete in the post-pouring reserved grooves to form integral steel-concrete combined box girder segments;
when prefabricating the steel box girder segment, arranging a steel grid chamber welded with a stud at the joint of the top plate of the steel box girder segment;
the bracket-free industrialized construction method comprises the following steps:
prefabricating concrete bridge decks and channel-shaped steel beams in bridge piers, steel box girder sections and steel-concrete combined box girder sections; a steel grid chamber welded with a stud is arranged at the joint of the top plates of the steel box girder sections; a post-pouring reserved groove is formed in the precast concrete bridge deck, and a connecting bolt matched with the post-pouring reserved groove is arranged at the top of the channel-shaped steel beam;
constructing a pile foundation bearing platform, hoisting the prefabricated pier to be in place and installing a support;
hoisting the steel box girder segments to the support saddle at the top of each bridge pier in sequence; hoisting the channel-shaped steel beams in the steel-concrete combined box girder sections between two adjacent supports, and completing the connection of the web plates and the bottom plates between the steel box girder sections and the channel-shaped steel beams by adopting a high-strength bolt and double-sided splice plate fillet welding connection structure after adjustment; and finally, splicing prefabricated concrete bridge deck plates, pouring wet joints of bridge deck plates and steel lattice chamber concrete, and completing the integral construction of the steel-concrete combined continuous box girder bridge.
2. The bracket-free industrialized construction method of the steel-concrete combined continuous box girder bridge, which is characterized by comprising the following steps of: the fillet welding connection structure of the high-strength bolt and the double-sided splice plate comprises splice steel plates clamped at two sides of the joint of the steel-concrete combined box girder segment and the web plate or the bottom plate of the steel box girder segment, wherein the splice steel plates are provided with connecting holes at intervals, and the high-strength connecting bolts are inserted into the connecting holes; the periphery of the spliced steel plate and the web plate or the bottom plate are welded into a whole through fillet welding.
3. The bracket-free industrialized construction method of the steel-concrete combined continuous box girder bridge, which is characterized by comprising the following steps of: the connection between the bearing platform and the pier adopts a connection mode of grouting sleeve and post-pouring high-strength shrinkage-free cement paste: when the bearing platform is poured, the embedded bars extend out of the top of the bearing platform; when prefabricating the pier, embedding the grouting sleeve at the bottom of the pier; and during splicing, the embedded bars at the top of the bearing platform are inserted into the grouting sleeve at the bottom of the pier, and high-strength non-shrinkage cement paste is poured into the grouting sleeve to form the whole of the bearing platform and the pier.
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| CN111021227B (en) * | 2019-11-29 | 2021-06-01 | 东南大学 | Steel-concrete composite structure continuous box girder and manufacturing method thereof |
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