CN211947873U - Bridge structure for reversely constructing existing roads - Google Patents
Bridge structure for reversely constructing existing roads Download PDFInfo
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- CN211947873U CN211947873U CN202020420047.4U CN202020420047U CN211947873U CN 211947873 U CN211947873 U CN 211947873U CN 202020420047 U CN202020420047 U CN 202020420047U CN 211947873 U CN211947873 U CN 211947873U
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Abstract
The utility model relates to a bridge structure for passing existing roads under reverse construction, which comprises a cast-in-place beam body, a body-free abutment, a foundation bearing platform, an abutment pile foundation, a pile front hanging plate, a pile pier of a strip steel casing, a protective steel sheet pile, a post reinforcing jet grouting pile and a post butt strap, and solves the problems that the overpass is passed under the construction of the expressway and the busy urban road, the foundation pit deeply influences the road traffic and the surrounding building safety, when the existing road or the surrounding building of the road can not be completely sealed, in order to ensure the road to be unblocked, the influence on the existing road traffic is reduced, the influence on the existing building is reduced, a large amount of protection is required to be carried out on the deep foundation pit of the construction, the construction risk is increased, the problem of investment is increased, the busy urban road or the expressway does not need to be completely sealed when the bridge is passed under the construction, half-width traffic is satisfied, the protection difficulty and the construction risk are reduced, the safety risk of the passing road and the surrounding buildings is reduced, and the construction safety of the underpass road is improved.
Description
Technical Field
The utility model relates to a road engineering belongs to highway municipal traffic engineering technical field, is a bridge construction who wears existing road under reverse construction particularly.
Background
With the rapid development of economic construction in China, the demand for traffic is continuously increased, a piece of modern highway and urban road are being built, in many cases, the situation that a newly-built road is crossed with an existing road occurs, in order to reduce the amount of engineering and reduce the construction risk, sometimes the control of front and back sections occurs, and the situation that the newly-built road passes through the existing road occurs, an overpass needs to be built on an expressway and a busy urban road, the deeper foundation pit affects the road passage and the surrounding building safety, when the existing road can not be completely closed or the surrounding buildings are dense, in order to ensure the road smoothness, reduce the influence on the existing road passage and the influence on the existing buildings, the deep foundation pit needs to be protected greatly during construction, the construction risk is increased, the investment is increased, therefore, it is necessary to develop an economical and safe bridge construction form and construction method.
The conventional overpass is designed according to normal conditions, a road completely closes a broken road, the overpass is excavated and constructed according to design requirements, and only buildings around a foundation pit are protected. The other type is that the existing road has heavy traffic, cannot be completely closed, and must be protected to be open in half width, and at the moment, the half width protected to be open needs to be protected in large scale during construction, even cannot be applied, so that the construction risk is extremely high, and the construction is quite uneconomical and unsafe.
The overpass is built under expressways and busy urban roads, the deeper foundation pit of the overpass affects the road and the safety of surrounding buildings, when the existing roads can not be completely closed or the buildings around the roads are dense, the construction safety and investment saving are considered, and the general bridge structure form and construction method are not suitable to be adopted.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to the not enough that exists among the above-mentioned prior art, a bridge construction of wearing existing road under reverse construction is provided, can satisfy half a width of a word through the car, reduce the foundation ditch, reduce the excavation protection, reduce the protection difficult road, reduce the construction risk, practice thrift the investment, reduce the safety risk of current road and peripheral building, the security of wearing road construction under the improvement, this solution is highway, busy urban road builds the most economical and feasible scheme of wearing overpass under constructing.
In order to solve the above problem, the utility model adopts the following technical scheme: a bridge structure for reverse construction and downward crossing of existing roads comprises a cast-in-place beam body, a body-free abutment, a foundation bearing platform, an abutment pile foundation, a pile front hanging plate, a pile pier with a steel casing, a protective steel sheet pile, a post reinforcing jet grouting pile and a post lapping plate, the cast-in-situ beam body is supported on the foundation bearing platform and the top of the pile pier of the strip steel casing, the top ends of two sides are connected with the self-free abutment, the self-free abutment is not provided with an abutment body and only comprises a back wall and a side wall, the self-free abutment is directly arranged on the top of a foundation bearing platform, the foundation bearing platform is directly arranged on an abutment pile foundation, the back wall of the self-free abutment is connected with a cast-in-place beam body through an expansion joint, a post-abutment butt strap is arranged on the self-free abutment, the abutment pile foundation is arranged in double rows along the bridge direction, the upper end of a pile foundation of the front-row abutment is provided with a front pile hanging plate, the rear reinforcing jet grouting pile is arranged behind the self-free abutment, and the front reinforcing jet grouting pile is arranged in front of the self-free abutment.
Preferably, the cast-in-place beam body is single-span or multi-span.
Preferably, the cast-in-place beam body is connected with the foundation bearing platform and the pile pier of the strip steel casing through a supporting system, the supporting system is directly arranged at the top ends of the foundation bearing platform and the pile pier of the strip steel casing, and the supporting system comprises a supporting cushion stone and a support.
Preferably, the thickness of the back wall of the body-free abutment is 0.45m, the thickness of the side wall is 0.5m, and the width of the side wall is 1.6 m.
Preferably, the thickness of the foundation cap is 2.0 m.
Preferably, the pile diameter of the abutment pile foundation is 1m or 1.2m, the thickness of the front hanging plate of the pile is 0.45m, the thickness of the lower part of the pile is not less than 0.5m below the buried pavement, and the materials are all reinforced concrete.
Preferably, the post-platform reinforced rotary jet grouting piles are arranged in 4 rows along the bridge direction, the pile spacing is 1.2m, the arrangement mode adopts a transverse type or quincunx type, and the pile end is not less than 3m lower layer road pavement.
Preferably, the reinforced rotary jet grouting piles in front of the platform are arranged in 4 rows along the bridge direction, the pile spacing is 1.2m, the piles are arranged in a transverse mode, and the pile length is not less than 6 m.
Preferably, the pile diameter of the pile pier with the steel pile casing is 1.5m, and the steel pile casing is adopted to follow up when the pile foundation is constructed, and the steel pile casing is not less than 1m below the ground level of the lower layer.
Preferably, the road is constructed in a split-frame mode, a half-frame vehicle is communicated, a half-frame closed mode is constructed, the middle separation belt is provided with protective steel sheet piles, the protective steel sheet piles are arranged within the length range of 5m behind the bridge background butt strap, and the protective steel sheet piles are made of Larsen steel sheet piles.
The utility model has the advantages of it is following:
(1) a bridge structure for reversely constructing an existing road and a construction method can effectively solve the problems of difficult traffic protection, large construction protection engineering and high safety risk when constructing an overpass under construction of expressways and busy urban roads.
(2) After the semi-range traffic is adopted, the steel sheet piles are adopted to protect the dividing strips, the safety of the semi-range road of the traffic is guaranteed, foundation pits are reduced, excavation protection is reduced, the protection difficulty is reduced, and the construction risk is reduced. The novel bridge pier can be well combined with roadbed pull grooves on two sides of a new road, the size of the bridge pier is small, the model is light and handy after the novel bridge pier is built, and the appearance effect is good.
(3) The construction can be implemented more safely, the construction period is short, the construction cost is saved, the method is economical and reasonable, and the technology is innovative.
Drawings
FIG. 1 is a schematic view of the vertical structure of the bridge structure of the present invention, wherein the numerical value is in cm;
FIG. 2 is a schematic diagram of a bridge layout plan structure of the present invention, wherein the numerical value is in cm;
FIG. 3 is a schematic view of the front structure of a left abutment of the present invention, wherein the numerical value is in cm;
fig. 4 is a schematic diagram of the front structure of a left pier of the present invention, wherein the numerical value is in cm;
in the figure: 1-cast-in-place beam body, 2-self-free abutment, 3-foundation bearing platform, 4-abutment pile foundation, 5-pile front hanging plate, 6-pile pier with steel casing, 7-protective steel sheet pile, 8-rear reinforced jet grouting pile, 9-front reinforced jet grouting pile and 10-rear lapping plate.
Detailed Description
The present invention will be further described with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1-4, a bridge structure for reverse construction and underpass of an existing road adopts a cast-in-place beam body 1 to be supported on the top of a foundation bearing platform 3 and a pile pier 6 with a steel casing and connected through a supporting system, the width S1 of the bridge structure is determined according to the requirement of the existing road width, the span L1 of the bridge structure is determined according to the arrangement of a lower road, single span or multiple spans can be set, most of the spans are nonstandard spans, the cast-in-place beam is adopted, and the height h1 of the cast-in-place beam is determined according to calculation. The support system comprises a support cushion and a support. The beam body is made of reinforced concrete or prestressed concrete.
A body-free abutment 2 adopted by a bridge structure for reversely constructing an underpass existing road only comprises a back wall and a side wall, wherein the thickness of the back wall is 0.45m, the width S2 is determined according to the width S1 of a cast-in-place beam body 1 and the thickness of the side wall, the height H1 of the back wall is determined by the height H1 of the beam and the height of a supporting system and is in a bracket shape, a back lapping plate 10 is conveniently arranged, and the back wall is connected with the cast-in-place beam body 1 through an expansion joint; the side wall thickness is 0.5m, the width is 1.6m, the side wall height H2 is the same as the back wall H1, and in order to reduce the excavation height as much as possible, the back wall and the supporting system are directly arranged on the top of the foundation bearing platform 3. The foundation bearing platform 3 is directly arranged on the abutment pile foundation 4, the length S3 of the foundation bearing platform 3 is determined by the requirement of road width, the width S4 is determined by the arrangement of the pile foundation, and the thickness is 2.0 m. The abutment pile foundations 4 are arranged in double rows along the bridge direction, the row number in the transverse bridge direction is determined according to the road width and the pile spacing, the pile diameter is generally 1m or 1.2m and determined according to calculation, and the pile length H3 is determined according to stress calculation. The materials are all reinforced concrete.
A foundation system adopted by a body-free abutment 2 of a bridge structure penetrating through an existing road under reverse construction is a high pile bearing platform system, after the road under the bridge is excavated, front row piles of an abutment pile foundation 4 are exposed, in order to block soil under a foundation bearing platform 3, a pile front hanging plate 5 is arranged on the front row pile foundation, the thickness of the hanging plate is 0.45m, the setting width S5 of the hanging plate is determined according to the range of the pile foundation, the setting height H4 of the hanging plate is determined according to road clearance, the thickness of the bearing platform and the like, the lower part of the hanging plate is buried below the road surface and is not less than 0.5m, the hanging plate can be prefabricated in blocks, and the hanging. In order to reduce the lateral soil pressure of the soil mass under the bearing platform on the hanging plate 5 in front of the pile, a post-platform reinforcing jet grouting pile 8 is arranged behind the bridge platform, the soil mass behind the self-free bridge platform 2 is reinforced, the reinforcing range width S6 is as wide as the width of the foundation bearing platform 3, 4 rows of jet grouting piles are arranged along the bridge direction, the pile spacing is 1.2m, the arrangement mode can adopt a transverse type or a quincunx type, the pile length H5 is determined according to the arrangement conditions and geological conditions of the lower road and the self-free bridge platform 2, and the clearance of the pile end lower than the road surface of the lower road is not less than 3 m. In order to guarantee the restraint of the abutment soil body on the abutment pile foundation 4, the lower layer road is locally reinforced in front of the body-free abutment 2, the reinforcing jet grouting piles 9 in front of the abutment are arranged, the reinforcing range width S7 of the reinforcing jet grouting piles is the same as the width of the foundation bearing platform 3, 4 rows of jet grouting piles are arranged along the bridge direction, the pile spacing is 1.2m, the jet grouting piles are arranged in a transverse mode, and the pile length H6 is determined according to geological conditions through calculation and is not less than 6 m. The pre-pile hanging plate 5 is made of reinforced concrete. The rotary spraying pile is made of concrete.
A bridge structure penetrating through an existing road under reverse construction adopts a pile pier 6 with a steel casing, a pile foundation is directly adopted as a pier supporting beam body, a supporting system is directly arranged at the top of the pile pier 6 with the steel casing to support a cast-in-place beam body 1, the pile diameter of the pile pier adopts 1.5m, the arrangement of the axial root number of a cross bridge is determined according to the width of a road and calculation, and the pile length H7 is determined according to the stress calculation. When the pile foundation is constructed, a steel pile casing is adopted to follow, the steel pile casing is not less than 1m below the ground elevation of the lower layer, and the redundant steel pile casing at the top is cut off when the pile top is chiseled and a cushion stone is applied. The material is reinforced concrete.
A bridge structure for reversely constructing an existing road downwards penetrates through a half-width road of a traffic, a protective steel sheet pile 7 is arranged in a middle separation belt, the setting range S8 of the steel sheet pile is the range of 5m of the length behind a bridge butt strap, and the pile length H8 is determined according to the local excavation depth and calculation. The material is Larsen steel sheet pile.
A bridge structure penetrating an existing road under reverse construction needs to clean a foundation bearing platform 3, a pile front hanging plate 5 and a pile pier 6 of a strip steel casing when the road under the bridge is excavated to a designed elevation, and is decorated according to needs.
The utility model discloses a main construction steps and method as follows:
1. traffic fluffing is comprehensively considered, a left road is closed, and a right road is adopted for traffic.
2. And constructing a protective steel sheet pile 7 along the direction of the bridge at the position of the middle separation band in the bridge range close to the right road as much as possible.
3. And (3) constructing a left bridge on the original ground, reinforcing a jet grouting pile 8 behind the platform and reinforcing a jet grouting pile 9 in front of the platform, and paying attention to the control of the length of an empty pile during construction of the jet grouting pile.
4. And (3) drilling in situ on the original ground, and simultaneously constructing the pile foundation 4 of the bridge abutment of the left bridge and the pile pier 6 of the strip steel pile casing, wherein the pile pier 6 of the strip steel pile casing needs to follow the steel pile casing.
5. After the left bridge pile foundation is completely constructed, locally excavating a foundation pit of a left bridge abutment foundation bearing platform 3, chiseling off a pile head, constructing the foundation bearing platform 3 and a supporting system, and simultaneously embedding embedded steel bars of a back wall and a side wall; and (3) locally excavating a foundation pit of a pile pier 6 with the steel pile casing, cutting off redundant steel pile casings, chiseling a pile head, remaking a pier top, and constructing a supporting system.
6. And (4) excavating the main line roadbed at the left bridge position for the first time, wherein the excavation depth is up to the position where the support template can be conveniently installed.
7. And adopting a support template to cast the left bridge cast-in-place beam body 1, and stretching and anchoring the prestressed system.
8. And (3) constructing the abutment back and the side wall of the left bridge body-free abutment 2, backfilling an abutment back foundation pit by adopting permeable soil and leveling after the strength of the abutment back concrete reaches 100% of the design strength, constructing a left bridge abutment back butt strap 10 and constructing an expansion joint.
9. And (4) completing bridge deck projects such as bridge deck anti-collision walls, bridge deck pavement and anti-net throwing of the left bridge deck, recovering pavements on two sides of the platform tail, and recovering the left road traffic.
10. And pulling out the protective steel sheet pile 7.
11. And (4) closing the right road, adopting the left road to pass through the vehicle, finishing the construction of the right bridge by referring to the steps (3) to (9), recovering the right road to pass through the vehicle, and finally forming the full-road passing vehicle.
12. And (3) performing secondary excavation on the main line roadbed under the bridge to reach the designed elevation of the lower layer road, and constructing the front hanging plate 5 of the overpass pile and the roadbed and pavement engineering of the road under the bridge.
13. And cleaning the foundation bearing platform 3, the pile front hanging plate 5 and the pile pier 6 of the strip steel casing, and constructing and decorating according to requirements.
14. And finishing the construction of the bridge.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention. It should be understood by those skilled in the art that any modification, equivalent replacement, or improvement made to the technical solutions or parts of technical features described in the above embodiments can be included in the scope of the present invention within the spirit and principle of the present invention.
Claims (10)
1. The utility model provides a bridge construction of existing road is worn down in reverse construction which characterized in that: the cast-in-place bridge comprises a cast-in-place bridge body (1), a body-free bridge abutment (2), a foundation bearing platform (3), a bridge abutment pile foundation (4), a pile front hanging plate (5), a pile column bridge pier (6) with a steel strip casing, a protective steel sheet pile (7), a post reinforcing jet grouting pile (8), a post reinforcing jet grouting pile (9) and a post abutment (10), wherein the cast-in-place bridge body (1) is supported at the top of the pile column bridge pier (6) of the foundation bearing platform (3) and the steel strip casing, the top ends of two sides are connected with the body-free bridge abutment (2), the body-free bridge abutment (2) is not provided with a bridge abutment body and only comprises a back wall and a side wall, the body-free bridge abutment (2) is directly arranged on the foundation bearing platform (3), the foundation bearing platform (3) is directly arranged on the bridge abutment pile foundation (4), the back wall of the body-free bridge abutment (2) is connected with the cast-in-place bridge abutment (2) through expansion joints, the post rear abutment (10) is arranged in, link plate (5) before setting up the stake in front row abutment pile foundation (4), set up a reinforcement after platform and spout stake (8) soon behind no body abutment (2), set up a reinforcement before platform and spout stake (9) soon before no body abutment (2).
2. The bridge structure for underpass of existing road in reverse construction according to claim 1, wherein the cast-in-place beam body (1) is single span or multi-span.
3. The bridge structure for underpass of the existing road in reverse construction according to claim 1, wherein the cast-in-place beam body (1) is connected with the foundation bearing platform (3) and the pile pier (6) with the steel casing through a support system, the support system is directly arranged at the top ends of the foundation bearing platform (3) and the pile pier (6) with the steel casing, and the support system comprises a support cushion stone and a support.
4. The bridge structure for underpass of the existing road in reverse construction according to claim 1, wherein the free abutment (2) has a thickness of 0.45m on the back wall, a thickness of 0.5m on the side wall and a width of 1.6 m.
5. A reverse-construction bridge construction passing through an existing road according to claim 1, wherein the base cap (3) has a thickness of 2.0 m.
6. The bridge structure for underpass of existing road in reverse construction according to claim 1, wherein the pile diameter of the abutment pile foundation (4) is 1m or 1.2m, the thickness of the pile front hanging plate (5) is 0.45m, the thickness of the lower portion below the road surface for burying people is not less than 0.5m, and the materials are all reinforced concrete.
7. The bridge structure for underpass of existing road in reverse construction according to claim 1, wherein said post-platform reinforcing jet grouting piles (8) are arranged in 4 rows along the bridge direction, the pile spacing is 1.2m, the arrangement is in a transverse type or quincunx type, and the pile tip is not less than 3m lower than the road surface of the lower road.
8. The bridge structure for underpass of existing road in reverse construction according to claim 1, wherein the reinforcing jet grouting piles (9) in front of the platform are arranged in 4 rows along the bridge direction, the pile spacing is 1.2m, the piles are arranged in a transverse row, and the pile length is not less than 6 m.
9. The bridge structure according to claim 1, wherein the pile pier (6) with the steel casing has a pile diameter of 1.5m, and is driven by the steel casing until the height of the lower ground is not less than 1 m.
10. The bridge structure for underpass of the existing road in the reverse construction according to claim 1, wherein the road is constructed in a width division manner, a half width is opened by a vehicle, a half width is closed, the middle separation zone is provided with the protective steel sheet pile (7), the protective steel sheet pile (7) is arranged in a length range of 5m behind the bridge platform back butt strap (10), and the protective steel sheet pile is made of Larsen steel sheet piles.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020420047.4U CN211947873U (en) | 2020-03-27 | 2020-03-27 | Bridge structure for reversely constructing existing roads |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020420047.4U CN211947873U (en) | 2020-03-27 | 2020-03-27 | Bridge structure for reversely constructing existing roads |
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| CN211947873U true CN211947873U (en) | 2020-11-17 |
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| CN202020420047.4U Active CN211947873U (en) | 2020-03-27 | 2020-03-27 | Bridge structure for reversely constructing existing roads |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111305031A (en) * | 2020-03-27 | 2020-06-19 | 中铁二院昆明勘察设计研究院有限责任公司 | Bridge structure for reversely constructing underpass existing road and construction method |
-
2020
- 2020-03-27 CN CN202020420047.4U patent/CN211947873U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111305031A (en) * | 2020-03-27 | 2020-06-19 | 中铁二院昆明勘察设计研究院有限责任公司 | Bridge structure for reversely constructing underpass existing road and construction method |
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