CN112681140B - Bridge modified by existing roadbed at route intersection and construction method - Google Patents
Bridge modified by existing roadbed at route intersection and construction method Download PDFInfo
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- CN112681140B CN112681140B CN202011492333.2A CN202011492333A CN112681140B CN 112681140 B CN112681140 B CN 112681140B CN 202011492333 A CN202011492333 A CN 202011492333A CN 112681140 B CN112681140 B CN 112681140B
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Abstract
The invention relates to a method for changing an existing roadbed into a bridge at a route intersection, which comprises a capping beam, a pile foundation, a newly-built pavement system and a bridge deck; the side slopes on two sides of the existing roadbed at the route intersection are provided with pile foundations, the tops of the pile foundations are provided with cover beams, and the pile foundations and the cover beams form a pile foundation cover beam structure; a bridge deck is arranged on the bent cap, a newly-built pavement system which is lapped with the existing pavement system is arranged on the bridge deck, a channel with an inclined slope protection is arranged below the bridge deck, and a newly-built route passes through the channel; a capping beam groove is dug on a closed expressway, and a T-shaped gap bridge is arranged on the dug capping beam groove. The invention has the beneficial effects that: compared with the prior art, the method has the advantages that pile-column integrated pile foundation construction is carried out on the local excavation of the roadbed slope at the intersection of the existing roadbed modified bridge, secondary connection among piles and manufacturing of pier column steel templates are avoided, the construction period is shortened, normal traffic is not influenced, and the technical advantages are obvious.
Description
Technical Field
The invention relates to the technical field of highway engineering, in particular to a bridge modified by an existing roadbed at a route intersection and a construction method.
Background
In recent years, with the continuous advancement of urbanization in China, city planning and construction are unprecedentedly developed, and supporting traffic networks are increasingly developed. There are inevitably many intersections between the newly built road route and the existing road route. The crossing of the urban road and the highway can adopt two schemes of crossing the urban road or passing the highway downwards. When the roadbed of the existing highway at the intersection point is lower, a scheme of spanning the existing highway by a newly-built overpass bridge is generally adopted; however, when the existing highway subgrade at the intersection is higher in filling height and the existing highway is penetrated under the newly-built highway, in order to save the manufacturing cost and reduce the engineering investment, the scheme of changing the existing highway subgrade into the bridge is often adopted to replace the scheme of crossing the existing highway by the newly-built overpass bridge.
At present, a construction scheme of excavating a high-speed roadbed and then drilling piles is usually adopted in the implementation of roadbed-to-bridge engineering. However, the method usually needs steel sheet pile protection on the high-speed roadbed which can be protected to be communicated, construction cost is increased invisibly, the construction period of the cast-in-situ bored pile is long, difficulty is increased for construction and traffic organization, and the influence on traffic protection is large.
Therefore, it is important to find a method for changing the existing roadbed into the bridge and a construction method which have simple and stable structure, small influence on traffic protection in the construction process and short influence time.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a bridge modified by an existing roadbed at a route intersection and a construction method.
The road intersection has a roadbed changed into a bridge, which comprises a capping beam, a pile foundation, a newly-built pavement system and a bridge deck; pile foundations are arranged on the side slopes on the two sides of the existing roadbed at the path intersection, cover beams are arranged on the tops of the pile foundations, and the pile foundations and the cover beams form a pile foundation cover beam structure; the capping beam is provided with a bridge deck, the bridge deck is provided with a newly-built road system which is in lap joint with the existing road system, a channel with an inclined slope protection is arranged below the bridge deck, and a newly-built route passes through the channel.
Preferably, the method comprises the following steps: the pile foundation is of a pile-column integrated structure.
Preferably, the method comprises the following steps: a capping beam groove is dug on a closed expressway, and a T-shaped gap bridge is arranged on the dug capping beam groove.
Preferably, the method comprises the following steps: the T-shaped gap bridge is a temporary gap bridge formed by welding a steel structure and a steel panel and is clamped and fixed between pavement layers above the capping beam grooves.
Preferably, the method comprises the following steps: the bent cap groove is provided with a reinforcement cage, a side die, a bottom die and an end die of the bent cap, wherein the reinforcement cage is in lap joint with the top reinforcement of the pile foundation.
The construction method for changing the existing roadbed into the bridge at the intersection of the routes comprises the following steps:
1) Respectively carrying out partial side slope excavation on two sides of the existing roadbed at the route intersection to form side slope excavation, then carrying out construction of a pile foundation of the bridge, and carrying out construction of a bored pile in the side slope excavation area to complete pile foundation operation;
2) Excavating a capping beam groove on a closed expressway to reach the elevation position of the bottom of the capping beam, arranging a T-shaped gap bridge recovery vehicle on the capping beam groove, and excavating another capping beam groove to ensure that the capping beam groove is communicated with pile foundations on two sides;
3) After the capping beam groove is excavated, a bottom die, a side die, a reinforcement cage and an end die of the capping beam are arranged, wherein the reinforcement cage is firmly lapped with the top reinforcement of the pile foundation, and then concrete is poured to form a pile foundation capping beam structure; repeating the steps to form a plurality of pile foundation capping beam structures;
4) Sequentially closing half-width pavements, excavating existing pavement systems in the range of changing the roadbed into the bridge, withdrawing the T-shaped gap bridge during excavation, then constructing a bridge deck, and connecting two ends of the bridge deck to pile foundation capping beam structures; constructing a newly-built pavement system on the poured bridge deck, and smoothly lapping the newly-built pavement system with the existing pavement system;
5) Excavating the existing roadbed below the bridge deck to the designed elevation of the new line to be delivered; reasonably placing slopes at two ends of the roadbed to be excavated during excavation, forming a downward-penetrating channel of a newly-built route after excavation, and forming inclined slope protection at two sides of the channel; and after excavation, steel-clad treatment is carried out on the outer surface of the pile foundation capping beam, and the construction of changing the existing roadbed into the bridge at the route intersection is finally completed by adopting a scheme of coating anticorrosive paint.
The beneficial effects of the invention are:
1. compared with the prior art, the method has the advantages that pile-column integrated pile foundation construction is carried out on the local excavation of the roadbed slope at the intersection of the existing roadbed modified bridge, secondary connection among piles and manufacturing of pier column steel templates are avoided, the construction period is shortened, normal traffic is not influenced, and the technical advantages are obvious.
2. The T-shaped gap bridge adopted by the invention is simple to manufacture and install, low in cost, capable of eliminating the influence of excavation on traffic, capable of effectively recovering traffic, capable of ensuring that the crown beam is completely communicated in the maintenance process, and obvious in economic and technical benefits.
3. The invention has the advantages that the arranged route cross part is provided with the roadbed-to-bridge structure, the structure is simple, the influence on traffic is small in the whole construction process, and the influence time is short.
Drawings
FIG. 1 is a schematic view of an existing subgrade-bridge at a route intersection;
FIG. 2 is a top view of FIG. 1;
FIG. 3 is a schematic layout of a pile foundation;
FIG. 4 is a schematic illustration of a capping beam trench excavation;
FIG. 5 is a layout view of a T-shaped bridge;
FIG. 6 is a schematic illustration of the construction of the capping beam;
fig. 7 is a construction schematic diagram of a pile cover beam structure;
fig. 8 is a schematic illustration of a deck slab and newly constructed pavement system.
Description of reference numerals: 1-capping beam; 2-pile foundation; 3, newly building a pavement system; 4-bridge deck; 5-slope protection; 6, building a new route; 7-existing pavement systems; 8-existing roadbed; 9-side slope excavation; 10-capping beam groove; 11-T-bridge; 12-a roadbed to be excavated; 13-a reinforcement cage; 14-side form; and 15, preparing a bottom die.
Detailed Description
The present invention will be further described with reference to the following examples. The following examples are set forth merely to provide an understanding of the invention. It should be noted that, for those skilled in the art, without departing from the principle of the present invention, it is possible to make various improvements and modifications to the present invention, and those improvements and modifications also fall within the scope of the claims of the present invention.
Example one
The existing roadbed at the route intersection is changed into the bridge, and the bridge comprises pile foundations 2 arranged on side slopes on two sides of the existing roadbed 8 at the route intersection and capping beams 1 arranged on the tops of the pile foundations 2 to form a pile foundation capping beam structure; and a bridge deck 4 arranged on the capping beam 1 and a newly-built pavement system 3 arranged on the bridge deck 4 and lapped with the existing pavement system 7, then reasonably placing a slope below the bridge deck 4 and excavating a roadbed 12 to be excavated to form a channel with an inclined slope protection 5 for a newly-built route 6 to pass through.
The pile foundation 2 is of a pile-column integrated structure.
The bent cap 1, the existing pavement system 7 are excavated, and the bridge deck 4 and the newly-built pavement system 3 are constructed under the condition that the road is half-width closed and half-width bidirectional passing is realized.
When the bent cap 1 is constructed, a T-shaped gap bridge 11 is arranged on the excavated bent cap groove 10 and used for recovering the traffic.
The T-shaped gap bridge 11 is a temporary gap bridge formed by welding a steel structure and a steel panel and is fixedly clamped between pavement layers above the bent cap groove 10.
The bent cap groove 10 is provided with a reinforcement cage 13, a side mold 14, a bottom mold 15 and an end mold of the bent cap, wherein the reinforcement cage 13 is in lap joint with the top reinforcement of the pile foundation 2.
Example two
The construction method for changing the existing roadbed at the route intersection into the bridge comprises the following steps:
1) As shown in fig. 3, partial side slope excavation is performed on both sides of the existing roadbed 8 at the route intersection to form side slope excavation 9, then the construction of the pile foundation 2 of the bridge is performed, and the construction of bored piles (pile-column integration) is performed in the region of the partial side slope excavation, thereby completing the operation of the pile foundation 2.
2) As shown in fig. 4 and 5, a capping beam groove 10 is dug on a closed expressway to reach the height position of the bottom of a capping beam 1, a T-shaped gap bridge 11 is arranged on the capping beam groove 10 to restore the vehicle, and another capping beam groove 10 is dug to enable the capping beam groove 10 to be communicated with pile foundations 2 on two sides.
3) As shown in fig. 6 and 7, after the capping beam trench 10 is excavated, the bottom mold 15, the side mold 14, the reinforcement cage 13 and the end mold of the capping beam 1 are arranged, wherein the reinforcement cage is firmly overlapped with the top reinforcement of the pile foundation 2, and then concrete is poured to form the pile foundation capping beam structure. And repeating the steps according to the engineering requirement to form a plurality of pile foundation capping beam structures.
4) As shown in fig. 8, the half-width road surface is closed in sequence (half-width closed and half-width bidirectional passing), the existing road surface system 7 in the range of the roadbed-modified bridge is excavated, the T-shaped gap bridge 11 is firstly withdrawn during excavation, then the construction of the bridge deck 4 is carried out, and the two ends of the bridge deck 4 are connected to the pile-foundation capping beam structure. And (3) constructing a newly-built pavement system 3 on the poured bridge deck slab 4, and smoothly overlapping the newly-built pavement system with the existing pavement system 7.
5) As shown in fig. 1 and 2, existing roadbed 8 below the bridge deck 4 is excavated to the designed elevation of the constructed road line 6. During excavation, reasonable slope placing is carried out at two ends of the roadbed 12 to be excavated, after excavation, a downward-penetrating channel of the newly-built route 6 is formed, and inclined slope protection 5 is formed at two sides of the channel. And after excavation, steel coating treatment needs to be carried out on the outer surface of the pile foundation capping beam, and a scheme of coating anti-corrosion paint can be adopted, so that construction of changing the existing roadbed at the route intersection into the bridge is finally completed.
Claims (2)
1. The utility model provides a route cross existing road bed changes bridge which characterized in that: comprises a capping beam (1), a pile foundation (2), a newly-built pavement system (3) and a bridge deck (4); the side slopes on two sides of the existing roadbed (8) at the route intersection are provided with pile foundations (2), the tops of the pile foundations (2) are provided with cover beams (1), and the pile foundations (2) and the cover beams (1) form a pile foundation cover beam structure; a bridge deck (4) is arranged on the bent cap (1), a newly-built pavement system (3) which is lapped with an existing pavement system (7) is arranged on the bridge deck (4), a channel with an inclined protection slope (5) is arranged below the bridge deck (4), and a newly-built route (6) passes through the channel; a capping beam groove (10) is dug on a closed expressway, and a T-shaped gap bridge (11) is arranged on the dug capping beam groove (10); the T-shaped gap bridge (11) is a temporary gap bridge formed by welding a steel structure and a steel panel and is clamped and fixed between pavement layers above the capping beam grooves (10); the pile foundation (2) is of a pile-column integrated structure; the bent cap groove (10) is provided with a reinforcement cage (13), a side die (14), a bottom die (15) and an end die of the bent cap, wherein the reinforcement cage (13) is in lap joint with the top reinforcement of the pile foundation (2).
2. The construction method for modifying the bridge based on the existing roadbed at the route intersection, which is disclosed by claim 1, is characterized by comprising the following steps of:
1) Respectively carrying out partial side slope excavation on two sides of an existing roadbed (8) at a route intersection to form side slope excavation (9), then carrying out construction of a pile foundation (2) of the bridge, and carrying out construction of a bored pile in a side slope excavation (9) area to complete pile foundation (2) operation;
2) Excavating a capping beam groove (10) on a closed expressway to reach the elevation position of the bottom of a capping beam (1), arranging a T-shaped gap bridge (11) on the capping beam groove (10) to recover to pass through a vehicle, and excavating another capping beam groove (10) to ensure that the capping beam groove (10) is communicated with pile foundations (2) on two sides;
3) After the capping beam groove (10) is excavated, a bottom die (15), a side die (14), a reinforcement cage (13) and an end die of the capping beam (1) are arranged, wherein the reinforcement cage is firmly lapped with a reinforcement at the top of the pile foundation (2), and then concrete is poured to form a pile foundation capping beam structure; repeating the steps to form a plurality of pile foundation capping beam structures;
4) Sequentially closing half-width pavements, excavating the existing pavement system (7) in the range of changing the roadbed into the bridge, withdrawing the T-shaped gap bridge (11) during excavation, then constructing the bridge deck (4), and connecting two ends of the bridge deck (4) to the pile foundation capping beam structure; constructing a newly-built pavement system (3) on the poured bridge deck (4), and smoothly overlapping the newly-built pavement system with the existing pavement system (7);
5) Excavating the existing roadbed (8) below the bridge deck (4) to the design elevation of the newly constructed road (6); during excavation, reasonable slope releasing is carried out at two ends of the roadbed (12) to be excavated, after excavation, a downward-penetrating channel of the newly-built route (6) is formed, and inclined revetments (5) are formed at two sides of the channel; and after excavation, steel-clad treatment is carried out on the outer surface of the pile foundation capping beam, and the construction of changing the existing roadbed into the bridge at the route intersection is finally completed by adopting a scheme of coating anticorrosive paint.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011492333.2A CN112681140B (en) | 2020-12-17 | 2020-12-17 | Bridge modified by existing roadbed at route intersection and construction method |
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| CN202011492333.2A CN112681140B (en) | 2020-12-17 | 2020-12-17 | Bridge modified by existing roadbed at route intersection and construction method |
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| CN112681140A CN112681140A (en) | 2021-04-20 |
| CN112681140B true CN112681140B (en) | 2022-12-23 |
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| CN113389150B (en) * | 2021-07-22 | 2022-08-09 | 山东省交通规划设计院集团有限公司 | Highway reconstruction and extension construction method for expanded bridge road section |
| CN117904911A (en) * | 2024-03-20 | 2024-04-19 | 新乡中铁公路发展有限公司 | Construction method for underpass of existing line of newly-built line |
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| FR2979927B1 (en) * | 2011-09-13 | 2019-03-15 | Mustapha Aboulcaid | METHOD FOR THE CONSTRUCTION OF WORKS, ESPECIALLY PASSAGES UNDER RAILWAYS OR SIMILARS IN OPERATION |
| CN103938512B (en) * | 2014-04-30 | 2016-08-24 | 陕西交科公路勘察设计有限公司 | The inverted construction method of existing highway is worn under a kind of newly-built road |
| CN107090851B (en) * | 2017-04-24 | 2019-06-11 | 北京城建道桥建设集团有限公司 | The inverted side-wall construction method of downtown area open cut groove |
| CN108978439A (en) * | 2018-09-29 | 2018-12-11 | 遂宁市长丰机械科技有限公司 | The emergency gantry of usage mining machine installation |
| CN110804916A (en) * | 2019-11-26 | 2020-02-18 | 山西省交通规划勘察设计院有限公司 | Construction method for newly-built road to pass through existing road under traffic state |
| CN215051679U (en) * | 2020-12-17 | 2021-12-07 | 湖北省路桥集团有限公司 | Bridge for changing existing roadbed at route intersection |
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