Bridge pile foundation anti-scouring structure and construction method thereof

Abstract

The invention discloses a bridge pile foundation anti-scour structure and a construction method thereof.The anti-scour structure comprises an anti-scour protection wall and an isolation layer, the anti-scour protection wall is annular and arranged outside a pile foundation body in a sleeving mode, the bottom of the anti-scour protection wall abuts against a riverbed, and the top of the anti-scour protection wall is located above a flowing water surface; the thickness of the anti-scouring protection wall is larger than 20 cm, and the anti-scouring protection wall comprises concrete and protection wall steel bars. A gap is formed between the anti-scouring protection wall and the pile foundation body, and the isolation layer is arranged in the gap. The technical effects are as follows: the scouring of water flow to the pile foundation body is reduced by utilizing the anti-scouring protection wall, the thickness of the pile foundation reinforcement protection layer is increased, the corrosion speed of the pile foundation reinforcement is slowed down, and the bearing capacity of the pile foundation body is guaranteed; when the elevation of the riverway is reduced after being scoured, the anti-scour protection wall descends to a riverbed under the action of the gravity of the anti-scour protection wall, so that the pile foundation body can be effectively protected; and construction transformation can be conveniently conducted on an existing pile foundation, and the repairing construction cost can be reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of bridge construction, and particularly relates to an anti-scouring structure for bridge pile foundations and a construction method for anti-scouring of bridge pile foundations. Background Art

[0002] Due to factors such as land use, terrain, and alignment, the setting of highway bridges is relatively common on expressways. The setting of bridges across mountain streams, rivers, and seasonal rivers is even more common.

[0003] However, when a bridge crosses a river or a seasonal river, the lower structures such as pile foundations are inevitably scoured by the water flow. The bridge pile foundations are soaked and scoured by the water flow for a long time. Affected by the changes in the water level line and the repeated action of natural conditions such as wind, snow, ice, and intense sunlight, the carbonation of the pile foundation concrete is accelerated, which greatly damages the durability of the bridge pile foundations. The scour of bridge pile foundations is one of the main reasons for bridge washouts. The water flow will rub and collide with the riverbed near the bridge pile foundations, resulting in the scour of the riverbed, and then causing changes or displacements in the boundaries of the pier foundations, and ultimately may lead to the overall collapse of the structure. Scour can occur in any area of the water flow, including small streams, rivers, and tidal estuaries, and the speed and degree of scour depend on the flow velocity, flow rate of the water flow, and the geological conditions of the riverbed. At the same time, the water flow scours the concrete protective layer of the pile foundation, reducing the steel bar protective layer of the pile foundation, causing the steel bars to rust and break, and ultimately leading to a change in the force-bearing structure of the bridge and a reduction in the bearing capacity. Therefore, it is necessary to design an anti-scouring structure for bridge pile foundations to solve the above technical problems. Summary of the Invention

[0004] For this reason, the present invention provides an anti-scouring structure for bridge pile foundations and its construction method to solve the above problems in the prior art.

[0005] In order to achieve the above object, the present invention provides the following technical solutions:

[0006] According to the first aspect of the present invention, an anti-scouring structure for bridge pile foundations includes an anti-scouring retaining wall and an isolation layer. The anti-scouring retaining wall is annular, the anti-scouring retaining wall is sleeved outside the pile foundation body, and the bottom of the anti-scouring retaining wall abuts against the riverbed, and the top of the anti-scouring retaining wall is above the water surface; the thickness of the anti-scouring retaining wall is greater than 20 cm, the anti-scouring retaining wall includes concrete and retaining wall steel bars, and the retaining wall steel bars are arranged in the concrete;

[0007] A gap is provided between the anti-scouring retaining wall and the pile foundation body, the isolation layer is arranged in the gap, and both sides of the isolation layer are hermetically and fittingly connected to the pile foundation body and the anti-scouring retaining wall respectively, and the isolation layer is made of an elastic material.

[0008] Further, the anti-scouring retaining wall is in multiple sections, and the multiple sections of the anti-scouring retaining wall are stacked coaxially in the vertical direction in sequence.

[0009] Furthermore, the isolation layer is made of foam glue, and the thickness of the isolation layer is greater than 10 cm.

[0010] Furthermore, the retaining wall steel bars include vertical steel bars and circumferential steel bars. There are multiple vertical steel bars, and the multiple vertical steel bars are arranged in a ring. The circumferential steel bars are wound outside the multiple vertical steel bars.

[0011] Furthermore, the circumferential steel bars are spiral bars, and the pitch of the spiral wires of the circumferential steel bars is 15 cm to 25 cm.

[0012] Furthermore, the distance between two adjacent vertical steel bars is 25 cm to 35 cm, and the vertical steel bars and the circumferential steel bars are connected by binding.

[0013] The present invention has the following advantages: The anti-scour retaining wall is used to protect the basic body of the pile. The anti-scour retaining wall can be used to reduce the scour of the water flow on the basic body of the pile, indirectly increasing the thickness of the steel bar protection layer of the pile foundation, thereby slowing down the corrosion rate of the steel bars of the pile foundation and ensuring the bearing capacity of the basic body of the pile; It is not affected by the elevation of the river channel scoured by the water flow. When the scoured elevation of the river channel decreases, the anti-scour retaining wall follows and descends to the riverbed under the influence of its own gravity, which can reduce the personnel inspection and construction costs and effectively protect the basic body of the pile; The materials required for the anti-scour retaining wall are all common materials in construction, which are convenient for procurement and use and have practicability; The structure is simple, which is convenient for construction transformation of the existing pile foundation and can reduce the repair construction cost.

[0014] According to the second aspect of the present invention, a construction method for anti-scour of bridge pile foundations uses the anti-scour structure described in the first aspect, and includes the following specific steps:

[0015] S100. Preparation work before construction;

[0016] S200. Conduct a survey of the bridge pile foundations along the river to check the degree and quantity of scour on the bridge pile foundations along the river;

[0017] S300. Install the retaining wall formwork;

[0018] S400. Construction of the retaining wall steel bars and concrete;

[0019] S500. Remove the retaining wall formwork after curing;

[0020] S600. Fill the gap between the anti-scour retaining wall and the basic body of the pile with foam glue;

[0021] S700. Observe the scour speed and determine the construction time of the next section of the anti-scour retaining wall. When the construction of the next section of the anti-scour retaining wall is required, return to S300;

[0022] S800. End the construction.

[0023] Further, when performing S200 and S300, the construction materials enter the site simultaneously.

[0024] In S300, before installing the retaining wall formwork, first level the site and remove sundries; when installing, first install the inner formwork, leaving a gap of no less than 10 cm wide between the inner formwork and the pile body to facilitate formwork removal and reserve the position of the isolation layer; finally install the outer formwork to determine the basic contour range of the retaining wall.

[0025] Further, in S600, during construction, pay attention to injecting a circle of foam glue from the lower part first, and then inject the next circle after the foam glue expands, filling the gap evenly and fully from bottom to top.

[0026] Further, in S700, the observation is carried out regularly or irregularly. The construction time of the next section of the anti-scour retaining wall is determined by observing the sinking position of the first section of the anti-scour retaining wall; after the riverbed drops due to the scouring of the flowing water, the anti-scour retaining wall descends under its own gravity to protect the pile foundation in real time, and the anti-scour retaining wall sections are added in time according to the scouring speed and the detection period.

[0027] The present invention has the following advantages: It is applicable to the construction of bridge pile foundations in the water scouring sections of related fields such as highways, railways, water conservancy, and municipal construction, especially suitable for the repair and protection construction of the exposed bridge pile foundations scoured by water, facilitating the construction transformation of the existing pile foundations, and reducing the repair construction cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only exemplary, and for those of ordinary skill in the art, without creative efforts, other implementation drawings can be obtained according to the provided drawings.

[0029] The structures, ratios, sizes, etc. illustrated in this specification are only used to cooperate with the content disclosed in the specification for those who are familiar with this technology to understand and read, and are not used to limit the limited conditions for the implementation of the present invention. Therefore, they do not have a substantial technical meaning. Any modification of the structure, change of the proportional relationship, or adjustment of the size, without affecting the effects that the present invention can produce and the purposes that can be achieved, should still fall within the scope covered by the technical content disclosed in the present invention.

[0030] Figure 1 It is a cross-sectional view of a bridge pile foundation anti-scour structure provided in some embodiments of the present invention after being installed on the pile foundation.

[0031] Figure 2A transverse sectional view of an anti-scouring structure for bridge pile foundations provided by some embodiments of the present invention.

[0032] Figure 3 A plan layout view of the retaining wall steel bars of an anti-scouring structure for bridge pile foundations provided by some embodiments of the present invention.

[0033] Figure 4 An elevation layout view of the retaining wall steel bars of an anti-scouring structure for bridge pile foundations provided by some embodiments of the present invention.

[0034] Figure 5 A schematic diagram of the installation condition of an anti-scouring structure for bridge pile foundations provided by some embodiments of the present invention.

[0035] Figure 6 A process flow chart of a construction method for anti-scouring of bridge pile foundations provided by some embodiments of the present invention.

[0036] In the figure: 1. Pile foundation body, 2. Anti-scouring retaining wall, 3. Isolation layer, 4. Vertical steel bars, 5. Circumferential steel bars, 6. Riverbed, 7. Water surface. Specific embodiments

[0037] The following specific embodiments illustrate the implementation manners of the present invention. Those skilled in the art can easily understand other advantages and effects of the present invention from the content disclosed in this specification. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of them. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0038] Embodiment 1

[0039] As Figures 1 to 5 shown, an anti-scouring structure for bridge pile foundations in the first aspect embodiment of the present invention includes an anti-scouring retaining wall 2 and an isolation layer 3. The anti-scouring retaining wall 2 is annular, sleeved outside the pile foundation body 1, and the bottom of the anti-scouring retaining wall 2 abuts against the riverbed 6. The top of the anti-scouring retaining wall 2 is above the water surface 7, and the top of the anti-scouring retaining wall 2 is more than 0.5 m above the water surface. When the riverbed 6 is scoured by water flow and sinks, the anti-scouring retaining wall 2 will sink together with the riverbed 6, thereby protecting the exposed pile foundation body 1. When the top of the anti-scouring retaining wall 2 is below the water surface, a new anti-scouring retaining wall 2 needs to be installed and the corresponding isolation layer 3 needs to be set up to facilitate good protection of the pile foundation body 1; the thickness of the anti-scouring retaining wall 2 is greater than 20 cm, which can effectively ensure its service life. The anti-scouring retaining wall 2 includes concrete and retaining wall steel bars. The retaining wall steel bars are arranged in the concrete, and the concrete is poured with concrete not lower than C30.

[0040] There is a gap between the erosion-proof retaining wall 2 and the pile basic body 1, and the width of the gap is not less than 10 cm to facilitate form removal, and an isolation buffer layer between the erosion-proof retaining wall 2 and the pile basic body 1 is reserved.

[0041] The isolation layer 3 is arranged in the gap. The two sides of the isolation layer 3 are hermetically attached to the pile basic body 1 and the erosion-proof retaining wall 2 respectively. The isolation layer 3 is made of an elastic material and is used to play a role of sealing isolation and buffering, prevent water flow from eroding the pile basic body, and prevent the erosion-proof retaining wall 2 from shaking and hitting the pile basic body 1 under the action of water flow.

[0042] In this embodiment, it should be noted that the erosion-proof retaining wall 2 is in multiple sections, and the multiple sections of the erosion-proof retaining wall 2 are coaxially stacked in sequence along the vertical direction. The height of each section of the erosion-proof retaining wall 2 is about 1 m. Specifically, after the riverbed is scoured and lowered by the flowing water, the erosion-proof retaining wall 2 is lowered under the action of its own gravity to protect the pile basic body 1 in real time. According to the scouring speed and the detection period, the sections of the erosion-proof retaining wall 2 are increased in time. It is appropriate that the topmost erosion-proof retaining wall 2 is exposed 0.5 m above the water surface to prevent the pile basic body 1 from being directly impacted by the water flow, so as to ensure a good protection effect on the pile basic body 1.

[0043] The technical effects achieved by this embodiment are as follows: Using the erosion-proof retaining wall 2 to protect the pile basic body 1, the erosion of the water flow on the pile basic body 1 can be reduced by the erosion-proof retaining wall 2. The flowing water first scours the erosion-proof retaining wall 2, reducing the scouring and peeling of the original concrete of the pile basic body 1, indirectly increasing the thickness of the pile foundation steel bar protection layer, reducing the corrosion rate of the bridge pile foundation steel bars, enhancing the durability of the bridge pile foundation structure, and ensuring the bearing capacity of the pile basic body 1; not affected by the elevation of the river channel scoured by the water flow. While the elevation of the scoured river channel is reduced, the erosion-proof retaining wall 2 follows and descends to the riverbed under the influence of its own gravity, which can reduce the personnel investigation and construction costs and can effectively protect the pile basic body 1; all the materials required for the erosion-proof retaining wall 2 are relatively common materials in construction, which are convenient for procurement and use and have practicability; the structure is simple, which is convenient for construction transformation of the existing pile foundation and can reduce the repair construction cost.

[0044] Embodiment 2

[0045] As Figures 1 to 5 shown, another bridge pile foundation anti-erosion structure provided by this embodiment includes all the contents of Embodiment 1, and only the different parts will be described below.

[0046] In this embodiment, the isolation layer 3 is made of foam glue, and the thickness of the isolation layer 3 is greater than 10 cm.

[0047] In this embodiment, it should be noted that during construction, pay attention to injecting a circle of foam glue from the lower part first. After the foam glue expands, inject the next circle. Fill the gap evenly and fully from bottom to top.

[0048] The technical effects achieved in this embodiment are as follows: The gap between the pile body 1 and the erosion - prevention retaining wall 2 is filled with foam glue. The free expansion of the foam glue can fully fill the gap. After the riverbed drops due to the erosion of flowing water, the erosion - prevention retaining wall 2 descends under its own gravity and protects the pile foundation in real - time. During the use process, according to the erosion speed and the detection period, the segments of the erosion - prevention retaining wall 2 are added in time and the corresponding isolation layer 3 is filled, so as to effectively protect the pile body 1.

[0049] Embodiment 3

[0050] As Figures 1 to 5 shown, another bridge pile - foundation erosion - prevention structure provided in this embodiment includes all the contents of Embodiment 1, and only the different parts will be described below.

[0051] In this embodiment, the retaining - wall steel bars include vertical steel bars 4 and circumferential steel bars 5. There are multiple vertical steel bars 4, and the multiple vertical steel bars 4 are arranged in a ring. The circumferential steel bar 5 is wound outside the multiple vertical steel bars 4. The vertical steel bars 4 are made of Φ12 steel bars, and the circumferential steel bars 5 are made of Φ8 steel bars.

[0052] In this embodiment, it should be noted that the circumferential steel bar 5 is a spiral steel bar, and the pitch of the spiral of the circumferential steel bar 5 is 15 cm to 25 cm. Specifically, the pitch of the spiral of the circumferential steel bar 5 can be set to 15 cm, 20 cm or 25 cm;

[0053] The distance between two adjacent vertical steel bars 4 is 25 cm to 35 cm. Specifically, the distance between two adjacent vertical steel bars 4 can be set to 25 cm, 30 cm or 35 cm, and the vertical steel bars 4 and the circumferential steel bars 5 are connected by binding.

[0054] The technical effects achieved in this embodiment are as follows: The retaining - wall steel bars are arranged inside the erosion - prevention retaining wall 2, so that the overall strength of the erosion - prevention retaining wall 2 is higher, it is more durable, and can form a lasting protective effect.

[0055] Embodiment 4

[0056] As Figure 6 shown, a bridge pile - foundation erosion - prevention construction method in the second - aspect embodiment of the present invention adopts the erosion - prevention structure in the first aspect, and includes the following specific steps:

[0057] S100. Preparation work before construction;

[0058] Before construction, a construction organization design should be done well, clarifying the construction method, construction technology, process flow, personnel organization and construction equipment, materials, tests, monitoring arrangements, as well as safety and quality management; and apply for the start of a single - item project. The start - up conditions include a start - up report, steel - bar material tests, mix - ratio tests, formwork quality data, relevant mechanical equipment, etc.;

[0059] S200. Conduct a survey of bridge pile foundations, and survey the degree and quantity of scour on the pile foundations of bridges along the river to facilitate the determination of construction requirements such as construction personnel, equipment, and materials.

[0060] S300. Install the retaining wall formwork.

[0061] Before installing the retaining wall formwork, first level the site and remove debris. During installation, first install the inner formwork, leaving a gap of no less than 10 cm wide between the inner formwork and the pile foundation body 1 to facilitate formwork removal and reserve the position of the isolation layer 3. Finally, install the outer formwork to determine the basic contour range of the retaining wall. Both the inner formwork and the outer formwork are made of plastic steel formwork, which has the characteristics of light weight, high strength, easy installation and disassembly, high recycling rate, convenient construction and easy transportation.

[0062] S400. Construction of retaining wall steel bars and concrete.

[0063] The retaining wall adopts a reinforced concrete retaining wall. Among them, the steel bars used are φ8 steel bars and Φ12 steel bars. The φ8 steel bars are made into spiral bars with a spiral pitch of 20 cm. The Φ12 steel bars are directly cut into steel bars 30 cm to 80 cm long and tied to the φ8 spiral bars at a spacing of 30 cm. During concrete construction, concrete with a strength grade not lower than C30 is used for pouring.

[0064] S500. Remove the retaining wall formwork after curing.

[0065] S600. Fill the gap between the anti-scour retaining wall 2 and the pile foundation body 1 with foam glue.

[0066] S700. Observe the scour velocity and determine the construction time of the next section of the anti-scour retaining wall 2. When the construction of the next section of the anti-scour retaining wall 2 is required, return to S300.

[0067] S800. End the construction.

[0068] In this embodiment, it should be noted that during the implementation of S200 and S300, the construction materials enter the site simultaneously.

[0069] The technical effects achieved by this embodiment are as follows: It is applicable to the construction of bridge pile foundations in the scouring sections of relevant fields such as highways, railways, water conservancy, and municipal construction, especially suitable for the exposed repair and protection construction of bridge pile foundations in the scouring sections. The required materials are all common materials in construction, which are convenient for procurement and use, and are convenient for construction transformation of existing pile foundations, and can reduce the repair construction cost.

[0070] Embodiment 5

[0071] As Figure 6 shown, another construction method for preventing scour of bridge pile foundations provided in this embodiment includes all the contents of Embodiment 4, and only the different parts will be described below.

[0072] In this embodiment, in S600, during construction, pay attention to injecting a circle of foam glue from the lower part first. After the foam glue expands, inject the next circle. Fill the gap evenly and fully from bottom to top.

[0073] In this embodiment, it should be noted that in S700, the observation is carried out regularly or irregularly. The construction time of the next section of the anti-erosion retaining wall 2 is determined by observing the sinking position of the first section of the anti-erosion retaining wall 2; after the riverbed 6 drops due to the erosion of flowing water, the anti-erosion retaining wall 2 descends under its own gravity and protects the pile foundation in real time. According to the erosion speed and the detection period, the section of the anti-erosion retaining wall 2 is increased in time.

[0074] Furthermore, the main materials involved in this construction method include steel bars, concrete (sand, gravel, cement), etc. All materials need to meet the requirements of corresponding national and industrial standards or specifications, and comply with the quality requirements of the on-site construction process. The grade or specification must meet the design requirements, and there should be a product certificate, an ex-factory inspection report and an in-site re-inspection report.

[0075] The quality assurance measures during the construction process are as follows:

[0076] 1. Material quality assurance: After the raw materials enter the site, check and verify the variety, specification, quantity, quality certificate, etc. of the raw materials, and sample and re-inspect according to the provisions of relevant standards. Only the raw materials that pass the inspection can enter the site. For the raw materials that fail the inspection, remove them from the site according to relevant regulations.

[0077] 2. Assurance measures for steel bar processing and installation: The steel bars should be installed accurately at the positions shown in the drawings, and the steel bars should be firmly fixed with positioning steel bars to prevent them from shifting during the pouring process.

[0078] 3. The concrete is poured layer by layer. Before construction, check the gaps of the formwork, and wet the inner wall with water to prevent the concrete from sticking. The pouring is formed at one time to ensure the integrity of the pile body.

[0079] 4. The connecting parts of the formwork installation are connected by snap tools, and the formwork joints are sealed with transparent tape to prevent slurry leakage.

[0080] 5. Use a spirit level to check the flatness of the formwork installation, and add rectangular wooden blocks to support the uneven parts to ensure the flatness of the pile body after formwork removal.

[0081] The safety measures taken during the construction process are as follows:

[0082] 1. Conduct safety technical disclosure before construction, and clarify the division of labor and unified command during the construction process.

[0083] 2. Adhere to the safety production policy of "safety first, prevention first", regularly check and implement safety responsibilities, strictly implement the safety production reward and punishment system, and hold those who violate the operation regulations accountable and deal with them seriously.

[0084] 3. Safety training should be well done before taking up the post. Construction workers should wear safety helmets when entering the site, and operators should abide by relevant safety operation procedures.

[0085] 4. All kinds of mechanical equipment should be in good condition.

[0086] 5. Necessary protective measures should be set up. Operators must wear safety belts and safety ropes.

[0087] 6. Mechanical equipment should be inspected by a special person to ensure its intact rate, and a maintenance system should be formulated.

[0088] 7. A special person is responsible for receiving and analyzing various meteorological and water regime forecasts during the flood season, sending them to all construction workers in a timely manner, and preparing countermeasures for prevention.

[0089] The environmental protection measures taken during the construction process are as follows:

[0090] 1. Establish and improve the environmental protection leading group. According to relevant national laws and local environmental protection regulations, formulate and issue feasible rules and regulations, arrange special personnel to be responsible for daily environmental protection work, do a good job in environmental protection publicity, education and guidance work, and strictly supervise and implement the execution.

[0091] 2. Formulate a detailed "Implementation Rules for Environmental Protection" as the code of conduct for construction workers, and appoint special environmental protection staff to be fully responsible for environmental protection work.

[0092] 3. Domestic garbage should be piled up at fixed points, buried and covered, and it is strictly prohibited to throw it around. Strengthen environmental protection education, improve the environmental protection awareness of all construction workers, and take environmental protection as one of the content of on-the-job education.

[0093] 4. Reasonably arrange the construction period, control the use time of high-noise equipment, avoid high-noise operations at night; select low-noise construction machinery and construction technology; it is strictly prohibited for transport vehicles to whistle when entering the construction site, and materials should be handled with care during loading and unloading.

[0094] 5. The domestic sewage of construction workers should be treated by a septic tank first, and then discharged after reaching the discharge standard, or entrust a qualified unit to conduct wastewater quality testing to ensure that the sewage discharge complies with relevant regulations.

[0095] 6. Construction machinery should prevent oil leakage, and prevent the oil sewage generated during the operation of construction machinery from being directly discharged without treatment or the oil sewage being directly discharged during the maintenance of construction machinery.

[0096] 7. After the construction is completed, clean up the garbage and sundries on the site, and carry out civilized construction and civilized withdrawal.

[0097] The economic benefits of this construction method are as follows:

[0098] Traditional anti-scour measures for pile foundations generally adopt gabion mesh protection. Taking a pile foundation with a diameter of 2.0m as an example, with a protection height of 1m, if gabion mesh protection is used to protect the perimeter of the pile foundation, when using the smallest-sized gabion mesh of 1*1*1m, 8 are needed, that is, 8m 3 , and the market comprehensive unit price is about 195 yuan / m 3 , then the cost per linear meter is 195 * 8 = 1560 yuan. For the C30 concrete used for the retaining wall by this construction method, the market comprehensive unit price is about 500 yuan / m 3 , when the thickness of the retaining wall is 0.4m and the thickness of the isolation layer is 0.2m, the concrete required for each linear meter of the retaining wall is [(2 + 0.2 + 0.4) / 2] 2 * 3.14 - [(2 + 0.2) / 2] 2 * 3.14 = 1.51m 3 , then the cost per linear meter is 1.51 * 500 = 754 yuan, saving 1560 - 754 = 806 yuan per linear meter.

[0099] In summary, without considering the equipment cost of one-time investment, the equipment invested in this construction method is not large. Calculated from the comprehensive unit price, the cost saved per linear meter is 806 yuan / m.

[0100] The social benefits of this construction method are as follows:

[0101] The materials used in this construction method during project construction are relatively common and widespread in the market, with convenient construction, safety and reliability. The traditional gabion protection has a large area affected by water flow scouring and is relatively easy to be washed away during floods. The resistance on the water-facing side is large, indirectly increasing the lateral shear force of the bridge substructure and increasing the risk of shear failure and overturning of the bridge substructure. This construction method is simple and easy to implement, with reliable quality, has good social benefits, and is easy to promote.

[0102] Although the present invention has been described in detail above with general descriptions and specific embodiments, based on the present invention, some modifications or improvements can be made, which are obvious to those skilled in the art. Therefore, these modifications or improvements made without departing from the spirit of the present invention all fall within the scope of protection required by the present invention.

[0103] The terms such as "upper", "lower", "left", "right", "middle", etc. cited in this specification are only for the convenience of clear narration and are not used to limit the scope of implementation of the present invention. The change or adjustment of their relative relationships, without substantial change in the technical content, should also be regarded as the scope of implementation of the present invention.

Claims

1. A bridge pile foundation anti-scour structure, characterized in that: The invention comprises an anti-scour wall (2) and an isolation layer (3), wherein the anti-scour wall (2) is annular and is sleeved outside the pile basic body (1), and the bottom of the anti-scour wall (2) abuts against the riverbed (6), and the top of the anti-scour wall (2) is located above the water surface (7); the thickness of the anti-scour wall (2) is greater than 20 cm, and the anti-scour wall (2) comprises concrete and wall reinforcement, and the wall reinforcement is arranged in the concrete; A gap is provided between the anti-scour protection wall (2) and the pile basic body (1), and the isolation layer (3) is arranged in the gap. Two sides of the isolation layer (3) are respectively sealed and fitted with the pile basic body (1) and the anti-scour protection wall (2), and the isolation layer (3) is made of elastic material.

2. The anti-scour structure for bridge pile foundation according to claim 1, characterized in that: The anti-scour protection wall (2) is composed of multiple sections, and the multiple sections of the anti-scour protection wall (2) are coaxially stacked in sequence along the vertical direction.

3. The anti-scour structure for bridge pile foundation according to claim 1, characterized in that: The isolation layer (3) is made of foam glue, and the thickness of the isolation layer (3) is greater than 10 cm.

4. The anti-scour structure for bridge pile foundation according to claim 1, characterized in that: The wall protection steel bars include vertical steel bars (4) and annular steel bars (5), the vertical steel bars (4) are multiple, the multiple vertical steel bars (4) are arranged in a ring shape, and the annular steel bars (5) are arranged around the multiple vertical steel bars (4).

5. The anti-scour structure for bridge pile foundation according to claim 4, characterized in that: The annular reinforcement (5) is a spiral reinforcement, and the spiral pitch of the annular reinforcement (5) is 15 cm to 25 cm.

6. The anti-scour structure for bridge pile foundation according to claim 4, characterized in that: The distance between two adjacent vertical steel bars (4) is 25 cm to 35 cm, and the vertical steel bars (4) are tied and connected to the annular steel bars (5).

7. A bridge pile foundation anti-scour construction method, using the anti-scour structure according to any one of claims 1 to 6, characterized in that: The specific steps include: S100, preparatory work before construction; S200, conduct bridge pile foundation inspection, and check the extent and quantity of bridge pile foundation scouring along the river; S300, install the wall protection formwork; S400, wall reinforcement and concrete construction; S500, after the curing is completed, the wall retaining formwork is removed; S600, the gap between the anti-scour protection wall (2) and the pile base body (1) is filled with foam glue; S700, observe the scouring speed and determine the construction time of the next section of the anti-scouring retaining wall (2), and when the construction of the next section of the anti-scouring retaining wall (2) is required, return to S300; S800, end the construction.

8. A bridge pile foundation anti-scour construction method according to claim 7, characterized in that: When carrying out S200 and S300, construction materials are brought in at the same time; In S300, before installing the retaining wall formwork, the site is leveled and debris is cleared; during installation, the inner formwork is first installed, and a gap of not less than 10 cm wide is reserved between the inner formwork and the pile basic body (1) to facilitate demoulding and reserve the position of the isolation layer (3); finally, the outer formwork is installed to determine the basic contour range of the retaining wall.

9. A bridge pile foundation anti-scour construction method according to claim 7, characterized in that: In S600, during construction, pay attention to injecting a circle of foam glue from the bottom first, and then inject the next circle after the foam glue expands, so that the gap is evenly and fully filled from bottom to top.

10. A bridge pile foundation anti-scour construction method according to claim 7, characterized in that: In S700, the observation is carried out regularly or irregularly, and the construction time of the next section of the anti-scour retaining wall (2) is determined by observing the sinking position of the first section of the anti-scour retaining wall (2); after the riverbed (6) is eroded by the flowing water and descends, the anti-scour retaining wall (2) protects the pile foundation in real time as it descends under the action of its own gravity, and the anti-scour retaining wall (2) sections are added in time according to the scouring speed and the detection cycle.

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