CN217324972U

CN217324972U - Anti-scouring reinforcing structure for pier in existing railway water

Info

Publication number: CN217324972U
Application number: CN202220893553.4U
Authority: CN
Inventors: 陈杰; 代汉超; 张奎; 马畔; 苏欣羽; 李鑫; 阮白一; 王晓平
Original assignee: China Railway Shanghai Design Institute Group Co Ltd
Current assignee: China Railway Shanghai Design Institute Group Co Ltd
Priority date: 2022-04-18
Filing date: 2022-04-18
Publication date: 2022-08-30
Anticipated expiration: 2032-04-18

Abstract

The utility model belongs to the technical field of the railroad bridge technique and specifically relates to an existing railway aquatic pier scour prevention additional strengthening, including the steel sheet pile, the steel sheet pile encloses to be established the pile foundation with the peripheral position of cushion cap, the top of steel sheet pile is sealed and is constituted overall structure through setting up concrete under water, concrete encloses to be established under water the periphery of cushion cap. The utility model has the advantages that: the problem that the bottom of a planned river channel is lower than the top of an existing railway bearing platform to prevent scouring can be solved, the bearing platform and pile foundations of piers in existing railway water are effectively protected, and the structural performance of the piers in existing railway water is guaranteed; the construction is convenient, fast, safe and efficient, and has little or no influence on the existing railway underwater piers; the method has the advantages of economy, reasonableness, good effect, high popularization and use values and wide application prospect.

Description

Anti-scouring reinforcing structure for pier in existing railway water

Technical Field

The utility model belongs to the technical field of the railroad bridge technique and specifically relates to an existing railway aquatic pier scour prevention additional strengthening mainly is applied to the river and erodees existing railway pier basis when great, protects existing pier basis.

Background

The design of the water piers of the railway crossing river needs to consider the scouring influence of water flow on the piers, and scouring caused by flood is an important factor influencing the safety of the bridge. Flood erodees pier basis, can arouse pier basis buried depth to reduce, the pile foundation exposes, pier bearing capacity and stability reduce scheduling problem, will produce very adverse effect to existing railway bridge, erodees pier basis disease that brings and can lead to the fact serious security threat to railway operation, and aquatic pier scour prevention design is very important.

With the development of economic society, part of river channels need to be dredged and widened due to planning and adjustment, some river channels need to be excavated downwards on the basis of the existing river bed, and when the river channels cross railways, the railway safety and the river channels are comprehensively considered according to the planning and dredging requirements, so that the absolute safety of railway bridges is ensured, and the requirements of river channel planning and dredging are met as much as possible. The river course is excavated the back downwards and may cause existing bridge cushion cap to expose, even the pile foundation exposes, and present common solution does:

1) the construction of the bored pile in the circle of the existing bearing platform is carried out: a circle of densely-drilled piles is adopted to replace the washing of a pier bearing platform and a pile foundation. But the drilled piles are difficult to avoid leaving gaps between the drilled piles, and the anti-scouring effect is poor. In addition, adjacent to the existing pier construction bored pile, the bored hole needs to be prevented from collapsing, and the construction safety risk is large.

2) Reinforcing the pile foundation bearing platform of the existing bridge: increase bored pile around existing bridge, become whole with new pile foundation and existing pile foundation connection with the cushion cap, increase pier pile foundation quantity and resist the rivers and erode the influence. However, according to the scheme, the number of the added pile foundations is large, when the water level elevation is large, a steel cofferdam in water needs to be added to the construction bearing platform reinforced concrete, the investment can be increased greatly, the construction time is long, and the quality control requirement is high.

Disclosure of Invention

The utility model aims at providing an existing railway aquatic pier scour prevention additional strengthening according to above-mentioned prior art's is not enough, through the protective structure who comprises steel sheet pile and concrete under water at existing railway pier cushion cap and pile foundation setting, makes this protective structure directly undertake the rivers and erode the influence to protect existing railway pier cushion cap and pile foundation.

The utility model discloses the purpose is realized accomplishing by following technical scheme:

the utility model provides an existing railway aquatic pier scour prevention additional strengthening for pile foundation and cushion cap to existing railway aquatic pier protect its characterized in that: the underwater concrete pile comprises a steel sheet pile, wherein the steel sheet pile is arranged at the peripheral positions of the pile foundation and the bearing platform in a surrounding mode, the top of the steel sheet pile is packaged by arranging underwater concrete to form an integral structure, and the underwater concrete is arranged at the periphery of the bearing platform in a surrounding mode.

The elevation of the bottom surface of the underwater concrete is not more than that of the bottom of the bearing platform, and the elevation of the top surface of the underwater concrete is consistent with that of the top surface of the bearing platform.

The top surface of the underwater concrete is provided with a certain gradient, and the gradient direction is downward from the outward direction of the bearing platform.

The depth of the steel sheet pile is below a water flow flushing line where the existing railway underwater pier is located.

And an epoxy resin anticorrosive layer is coated on the surface of the steel sheet pile.

The clear distance between the steel sheet pile and the pile foundation is larger than 2.5D, wherein D is the diameter of the pile foundation.

The utility model has the advantages that: the problem that the bottom of a planned river channel is lower than the top of an existing railway bearing platform to prevent scouring can be solved, the bearing platform and pile foundations of piers in existing railway water are effectively protected, and the structural performance of the piers in existing railway water is guaranteed; the construction is convenient, fast, safe and efficient, and has little or no influence on the existing railway underwater piers; the method has the advantages of economy, reasonableness, good effect, high popularization and use values and wide application prospect.

Drawings

Fig. 1 is an elevation view of the present invention;

FIG. 2 is a cross-sectional view of the present invention;

fig. 3 is a plan view of the present invention.

Detailed Description

The features of the present invention and other related features are described in further detail below by way of example in conjunction with the accompanying drawings to facilitate understanding by those skilled in the art:

as shown in fig. 1-3, the symbols 1-10 in the figures are respectively expressed as: the system comprises a pile foundation 1, a bearing platform 2, a pier 3, a beam part 4, a steel sheet pile 5, underwater concrete 6, a water surface line 7, an existing river bottom line 8, a planning river bottom line 9 and a water flow scouring line 10.

Example (b): as shown in fig. 1, the anti-scouring reinforcement structure for the pier in the existing railway water in the embodiment is used for protecting the pile foundation 1 and the bearing platform 2 of the pier in the existing railway water, and particularly, the pier in the existing railway water is prevented from being directly influenced by water scouring. The existing railway underwater bridge comprises a pile foundation 1 and a bearing platform 2, wherein the pile foundation 1 is arranged at the lower part of the bearing platform 2 and is used for supporting the bearing platform 2, a pier 3 is supported above the bearing platform 2, a beam part 4 is supported above the pier 3, and a railway can be arranged above the beam part 4.

As shown in fig. 1, the existing railway underwater bridge pier in this embodiment is located in a river channel, the river channel has a water surface line 7 and an existing river bottom line 8, at present, due to planning adjustment needs, the river bottom line of the river channel needs to be excavated from the position of the existing river bottom line 8 to the position of a planning river bottom line 9, at this moment, the bearing platform 2 of the existing railway underwater bridge pier is locally exposed at the river bottom due to excavation, and meanwhile, the adjusted river channel can perform water flow scouring on the bearing platform 2 and the pile foundation 1 within the range of the water flow scouring line 10, so that problems such as reduction of bridge pier bearing capacity and stability of the pile foundation 1 and the bearing platform 2 are easily caused.

Referring to fig. 1 to 3, the anti-scour reinforcement structure for the pier in the existing railway water includes a steel sheet pile 5, and the steel sheet pile 5 is driven by a circle around the peripheries of the pile foundation 1 and the pile foundation 2, so that the pile foundation 1 and the pile foundation 2 are surrounded in a protection area surrounded by the steel sheet pile 5. The top of the steel sheet pile 5 is encapsulated by adopting the underwater concrete 6, and the steel sheet pile 5 is circumferentially encapsulated within the plane arrangement range of the underwater concrete 6, so that the steel sheet piles 5 are connected into a whole, the integral strength of the protective structure can be improved, and water flow scouring can be resisted; meanwhile, the underwater concrete is arranged around the periphery of the bearing platform 2. As shown in fig. 1 or 2, in the range between the water surface line 7 and the water scouring line 10, the steel sheet piles 5 and the underwater concrete 6 located at the periphery of the platform 2 and the pile foundation 1 directly bear the water scouring influence, thereby protecting the platform 2 and the pile foundation 1.

In this embodiment, the depth of the steel sheet pile 5 is deeper than the water flow flushing line 10 and the top of the steel sheet pile is ensured to be in the underwater concrete 6, so that the underwater concrete 6 envelops the steel sheet pile 5 and the soil around the bearing platform 2 at the outer ring of the bearing platform 2.

The steel sheet piles 5 can be constructed by adopting a hydraulic inserting and driving method to reduce the influence on the pier foundation, the steel sheet piles 5 are inserted and driven to a stable depth one by one, and water needs to be closely attached among the steel sheet piles 5 to prevent the locking port of the steel sheet piles 5 from leaking water.

The clear distance between the steel sheet pile 5 and the pile foundation 1 is preferably larger than 2.5D (D is the diameter of the pile foundation 1) so as to avoid influencing the development of the side frictional resistance of the pile foundation.

The steel sheet pile 5 can be coated with epoxy resin or other anticorrosive materials, so that the underwater anticorrosive capability of the steel sheet pile is improved.

As shown in fig. 1 or fig. 2, the top surface of the underwater concrete 6 is provided with a slope (preferably about 1: 3) which is downward from the bearing platform 2 to reduce the influence of water blocking on the pier.

The elevation of the bottom surface of the underwater concrete 6 is not more than that of the bottom of the bearing platform 2, and the elevation of the top surface is consistent with that of the top surface of the bearing platform 2, so that the whole bearing platform 2 is within the protection range of the protection structure.

The construction method comprises the following steps:

aiming at the condition that the river channel can be subjected to cutoff construction, the construction steps are as follows:

1) cofferdams are arranged on two sides of the existing railway bridge to drain river water in the railway range.

2) And (3) adopting hydraulic piling equipment to drive the steel sheet pile 5 subjected to the anti-corrosion treatment into the designed bottom elevation according to the positioning position.

3) And excavating a river bed according to the planned river bottom elevation, and excavating the periphery of the bearing platform to the bottom surface of the underwater concrete 6.

4) And pouring underwater concrete 6, setting a drainage slope on the top surface of the underwater concrete, and enclosing the steel sheet pile 5.

5) And (4) removing the cofferdam and recovering river water.

Aiming at the condition that the river course is constructed with water all the year round, the construction steps are as follows:

1) and selecting a low water level time section, arranging a trestle around the bearing platform 2, and driving the steel sheet pile 5 subjected to corrosion prevention treatment into the designed bottom elevation according to the positioning position by using hydraulic equipment on the trestle.

2) And excavating soil bodies by adopting a small dredger according to the range of the underwater concrete 6, and pouring the underwater concrete 6 immediately after excavation.

3) And excavating the river channel by adopting a dredger according to the bottom line of the planned river bed.

In the embodiment, in specific implementation: the steel sheet pile 5 can adopt a common Larson type IV steel sheet pile.

The underwater concrete 6 may use C30 or higher grade concrete.

As shown in fig. 3, the planar shape of the protection area enclosed by the steel sheet piles 5 in this embodiment is a rectangle, and in actual use, the protection area may be designed into other shapes according to the factors such as the water flow scouring direction and the like, on the basis of satisfying the influence of the water flow scouring.

Although the conception and the embodiments of the present invention have been described in detail with reference to the drawings, those skilled in the art will recognize that various changes and modifications can be made therein without departing from the scope of the appended claims, and therefore, the description thereof is not repeated herein.

Claims

1. The utility model provides an existing railway aquatic pier scour prevention additional strengthening for pile foundation and cushion cap to existing railway aquatic pier protect its characterized in that: the underwater concrete pile comprises a steel sheet pile, wherein the steel sheet pile is arranged at the peripheral positions of the pile foundation and the bearing platform in a surrounding mode, the top of the steel sheet pile is packaged by arranging underwater concrete to form an integral structure, and the underwater concrete is arranged at the periphery of the bearing platform in a surrounding mode.

2. An existing railway underwater pier anti-scouring reinforcing structure as claimed in claim 1, which is characterized in that: the elevation of the bottom surface of the underwater concrete is not more than that of the bottom of the bearing platform, and the elevation of the top surface of the underwater concrete is consistent with that of the top surface of the bearing platform.

3. An existing railway underwater pier anti-scouring reinforcing structure as claimed in claim 1 or 2, wherein: the top surface of the underwater concrete is provided with a certain gradient, and the gradient direction is downward from the outward direction of the bearing platform.

4. An existing railway underwater pier anti-scouring reinforcing structure as claimed in claim 1, which is characterized in that: the depth of the steel sheet pile is below a water flow flushing line where the existing railway underwater pier is located.

5. An existing railway underwater pier anti-scouring reinforcing structure as claimed in claim 1, which is characterized in that: and an epoxy resin anticorrosive layer is coated on the surface of the steel sheet pile.

6. An existing railway underwater pier anti-scouring reinforcing structure as claimed in claim 1, which is characterized in that: the clear distance between the steel sheet pile and the pile foundation is larger than 2.5D, wherein D is the diameter of the pile foundation.