Construction method for newly building bridge foundation on roadbed side close to river levee

Abstract

The invention discloses a construction method for newly building a bridge foundation on the roadbed side adjacent to a river levee. The construction method comprises the following steps that S1, a row of roadbed maintenance structures are constructed on the river levee between the bridge foundation and the roadbed; s2, constructing a water retaining dam in the middle of the river channel, wherein the water retaining dam is distributed in the length direction of the river channel; s3, the part, close to the bridge foundation, of the existing retaining wall A is dismantled; s4, transverse retaining walls, two transverse retaining walls and a roadbed maintenance structure are constructed on the two sides of the bridge foundation correspondingly, and a well type foundation is formed between the existing retaining walls A which are not dismantled; s5, bridge pier columns continue to be constructed on the bridge foundation; s6, a fusion retaining wall is constructed in the well type foundation; and S7, the water retaining dam is dismantled, and the well type foundation is backfilled with a permeable material. According to the construction method, procedure connection is more reasonable, redundant procedures are avoided, construction is more convenient and faster, existing structures are protected, and pollution of construction to rivers is effectively reduced.

Description

Technical Field

[0001] The present invention relates to the field of construction of a new bridge foundation on the side of a roadbed close to a river bank. More specifically, the present invention relates to a construction method for a new bridge foundation on the side of a roadbed close to a river bank. Background Art

[0002] With the saturation of China's civil engineering industry, the reconstruction and expansion of existing roads has gradually emerged. Due to the large traffic demand after the expansion and the limited expansion space, the current common expansion method is to widen the ground layer on both sides + build a new three-dimensional bridge structure. When the new three-dimensional bridge is located between the existing roadbed and the river, the design position of the bridge foundation has a large conflict and interference with the existing retaining wall. During construction, the excavation of the foundation pit has a high risk of affecting the settlement and cracking of the existing roadbed. The mud brought by the bridge pile foundation construction has a large pollution to the river. Therefore, it is necessary to provide a construction method for the new bridge foundation on the roadbed side close to the river bank. Summary of the invention

[0003] In order to achieve these purposes and other advantages according to the present invention, a preferred embodiment of the present invention provides a construction method for a new bridge foundation on a roadbed side adjacent to a river bank, wherein two sides of a river channel are respectively a first side and a second side, an existing retaining wall A, a river bank and an existing road are sequentially arranged on the first side of the river channel in a direction away from the river channel, and an existing road is arranged on the second side of the river channel, and the construction method comprises the following steps: S1. construct a row of roadbed maintenance structures on the riverbank between the bridge foundation and the roadbed; wherein the existing retaining wall A is close to the first side of the river channel, and the bridge foundation is arranged at the step between the roadbed and the existing retaining wall A; S2. Construct a water-blocking dam in the middle of the river channel. The water-blocking dam is distributed along the length of the river channel. The water-blocking dam divides the river channel into two parts, one part is a dry water operation area, and the other part is a wet water area. The original river water in the river channel is blocked in the wet water area; S3. Demolish the existing retaining wall A near the bridge foundation; S4. Construct transverse retaining walls on both sides of the bridge foundation. The transverse retaining walls are arranged perpendicular to the length direction of the roadbed. A well-type foundation is formed between the two transverse retaining walls, the roadbed maintenance structure, and the existing retaining wall A that has not been removed. The well-type foundation frames the bridge foundation; S5. Continue to construct bridge piers on the bridge foundation; S6. Constructing a fused retaining wall in the well foundation, wherein the fused retaining wall will form a new retaining wall structure with the existing retaining walls A located on both sides of the fused retaining wall and not demolished; S7. Remove the water retaining dam and backfill the well foundation with permeable materials.

[0004] According to a preferred embodiment of the present invention, in S1, the roadbed maintenance structure includes anti-slip piles, baffles and crown beams, wherein the bottom of the anti-slip piles is vertically buried below the riverbed, two adjacent anti-slip piles are connected by a baffle, and the baffle is partially inserted into the stratum.

[0005] According to a preferred embodiment of the present invention, the roadbed maintenance structure further includes a crown beam, a crown beam is constructed on the top of the anti-sliding pile, and the top of the crown beam is exposed above the river bank.

[0006] According to a preferred embodiment of the present invention, in said S5, the caps and pile foundations of the bridge piers are buried below the riverbed.

[0007] According to a preferred embodiment of the present invention, in S5, the bridge piers and the position where the demolished existing retaining wall A is located interfere with each other.

[0008] According to a preferred embodiment of the present invention, after S6, the fused retaining wall wraps the lower part of the pier column, and the fused retaining wall is disconnected from the existing retaining wall A by an expansion joint.

[0009] According to a preferred embodiment of the present invention, foam boards and asphalt hemp are filled between the fusion retaining wall and the bridge piers.

[0010] The present invention includes at least the following beneficial effects: The present invention provides a method for the integrated design and construction of bridge piers + well-type retaining walls. Based on the environmental condition that the bridge foundation is clamped by the existing roadbed and river channel, the anti-slide piles + retaining plates on the roadbed side are first constructed, and then the existing retaining wall A is removed, and the pile foundation and the cap are constructed in the river channel. Finally, the pier column and the well-type retaining wall are synchronously integrated and constructed, and finally the well-type foundation is backfilled. The present invention has more reasonable process connection, avoids redundant processes, is more convenient to construct, protects existing structures, and effectively reduces the pollution of the river by construction.

[0011] (1) Under the condition of construction in a restricted space, the present invention ensures the safety of the existing roadbed and the convenience and environmental protection of construction in the river channel.

[0012] (2) The present invention realizes the integrated design of the bridge pier and the existing retaining wall A, avoiding the reduction of the river flood cross-section due to the construction of a new bridge, while ensuring the stress safety of the bridge pier and the appearance of the retaining wall.

[0013] (3) The present invention adopts a well-type maintenance structure to ensure the stress safety of the bridge and the river bank. Planting soil can be backfilled on the top of the well-type foundation to achieve the uniform beauty of the river bank along the line.

[0014] Other advantages, objectives and features of the present invention will be embodied in part through the following description, and in part will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] Figure 1 It is a construction schematic diagram of step S1 in the construction method of the present invention; Figure 2 It is a construction schematic diagram of step S2 in the construction method of the present invention; Figure 3 It is a construction schematic diagram of step S3 in the construction method of the present invention; Figure 4 It is a construction schematic diagram of step S4 in the construction method of the present invention; Figure 5 It is a construction schematic diagram of step S5 in the construction method of the present invention; Figure 6 A schematic diagram of the distribution between the bridge pier and the existing retaining wall A in step S5 of the construction method of the present invention; Figure 7 It is a construction schematic diagram of step S6 in the construction method of the present invention; Figure 8 It is a construction schematic diagram of step S7 in the construction method of the present invention. DETAILED DESCRIPTION

[0016] The present invention is further described in detail below in conjunction with the accompanying drawings so that those skilled in the art can implement the invention with reference to the description.

[0017] The following description is used to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are only examples, and those skilled in the art can think of other obvious variations. The basic principles of the present invention defined in the following description can be applied to other embodiments, variations, improvements, equivalents, and other technical solutions that do not deviate from the spirit and scope of the present invention.

[0018] Those skilled in the art should understand that, in the disclosure of the present invention, the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the drawings, which are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation. Therefore, the above terms should not be understood as limiting the present invention.

[0019] It is to be understood that the term "one" should be understood as "at least one" or "one or more", that is, in one embodiment, the number of an element may be one, while in another embodiment, the number of the element may be multiple, and the term "one" should not be understood as a limitation on the quantity.

[0020] like Figure 1-8As shown, a preferred embodiment of the present invention provides a construction method for a new bridge foundation on the roadbed side adjacent to a river bank, the two sides of a river channel 1 are respectively a first side and a second side, the first side of the river channel 1 is provided with an existing retaining wall A2, a river bank 3 and an existing road 4 in sequence along the direction away from the river channel, and the second side of the river channel is provided with an existing retaining wall B5, and the construction method comprises the following steps: S1. Construct a row of roadbed maintenance structures 6 on the riverbank 3 between the bridge foundation 11 and the roadbed; wherein the existing retaining wall A is close to the first side of the river channel.

[0021] The bridge foundation 11 is set at the step between the roadbed and the existing retaining wall A; since the foundation construction requires the removal of the pedestal, the height difference between the roadbed and the riverbed is usually 15 to 20 meters, and it is necessary to ensure the stability and safety of the existing road operation to prevent cracking or settlement accidents.

[0022] The roadbed maintenance structure 6 includes anti-sliding piles 6-1, baffles and crown beams 6-2. The bottom of the anti-sliding pile 6-1 is vertically buried below the riverbed, and two adjacent anti-sliding piles are connected by a baffle, and the baffle is partially inserted into the stratum. The roadbed maintenance structure also includes a crown beam, and a crown beam 6-3 is constructed on the top of the anti-sliding pile, and the top of the crown beam is exposed from the river bank.

[0023] Anti-sliding piles are set, and retaining plates are constructed between two adjacent anti-sliding piles 6 - 1 to stabilize the roadbed soil layer and ensure the stability of the entire roadbed after the existing retaining wall A is removed in subsequent construction.

[0024] S2. Construct a water retaining dam 7 in the middle of the river channel 1. The water retaining dam 7 is distributed along the length of the river channel. The water retaining dam 7 divides the river channel into two parts, one part is a dry water operation area 1-1, and the other part is a wet water area 1-2. The original river water in the river channel is intercepted in the wet water area; Due to the existence of the river channel, the traditional practice is to use steel platforms to construct bridge pile foundations and piers. However, under the design conditions, this is likely to cause water pollution, and the steel platform and steel trestles are difficult and expensive to lay out. Therefore, in this application, a water-blocking dam is laid along the longitudinal direction of the river channel to form a dry working environment on the side of the bridge retaining wall. Construction equipment enters the dry river channel side to carry out bridge foundation construction, effectively preventing pile foundation mud from entering the river channel.

[0025] S3. Demolish the existing retaining wall A near the bridge foundation; S4. Construct transverse retaining walls 8 on both sides of the bridge foundation. The transverse retaining walls 8 are arranged perpendicular to the length direction of the roadbed. A well-type foundation is formed between the two transverse retaining walls, the roadbed maintenance structure, and the existing retaining wall A that has not been removed. The well-type foundation frames the bridge foundation; S5, continue to construct bridge pier 9 on the bridge foundation; S6. Constructing a fused retaining wall 10 in the well foundation, wherein the fused retaining wall will form a new retaining wall structure with the existing retaining walls A located on both sides of the fused retaining wall and not demolished; S7, dismantle the water retaining dam 7, and backfill the well foundation with permeable material 14.

[0026] The traditional approach is to move the retaining wall outward to avoid conflict with the piers, but this will reduce the flood-carrying section of the river. How to achieve an integrated design of the bridge piers and retaining walls and ensure that the bridge piers will not be affected by the soil pressure from the outside of the retaining piles?

[0027] In the above technical solution, transverse retaining walls are constructed on both sides of the bridge foundation to form a well-type foundation with the retaining piles and river embankments, and the well-type foundation is backfilled with sand and gravel with good permeability, ensuring the structural stability of the restoration retaining wall and avoiding the piers from being subjected to soil pressure.

[0028] Under the condition of construction in left and right restricted spaces, the present invention ensures the safety of the existing roadbed and the convenience and environmental protection of construction in the river channel.

[0029] The present invention realizes the integrated design of the bridge pier and the existing retaining wall A, avoids the reduction of the river flood discharge section due to the construction of a new bridge, and at the same time ensures the stress safety of the bridge pier and the appearance of the retaining wall.

[0030] The present invention adopts a well-type maintenance structure to ensure the safety of the bridge and the river bank, and can also backfill planting soil on the top of the well-type foundation to achieve the uniform beauty of the river bank along the line. According to a preferred embodiment of the present invention, in S5, the cap and pile foundation of the bridge pier are buried below the riverbed 1-1 to minimize interference with the retaining wall.

[0031] According to a preferred embodiment of the present invention, in S5, the bridge piers and the position where the demolished existing retaining wall A is located interfere with each other.

[0032] According to a preferred embodiment of the present invention, after S6, the fused retaining wall wraps the lower part of the pier column, and the fused retaining wall is disconnected from the existing retaining wall A by an expansion joint 12, where the expansion joint is actually a construction joint. The fused retaining wall is separated from the load-bearing retaining wall to avoid cracking of the fused retaining wall under load, and the fused retaining wall actually serves a decorative purpose.

[0033] According to a preferred embodiment of the present invention, fillers 13 are filled between the fusion retaining wall and the bridge piers. The fillers include foam boards and asphalt hemp, which fill the gap between the fusion retaining wall and the pier body and utilize their good compression properties to adapt to possible deformation.

[0034] Although the embodiments of the present invention have been disclosed as above, they are not limited to the applications listed in the specification and the implementation modes, and they can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and the illustrations shown and described herein.

Claims

1. A construction method for building a new bridge foundation on the side of a roadbed adjacent to a river bank, wherein the two sides of a river channel are respectively a first side and a second side, the first side of the river channel is provided with an existing retaining wall A, a river bank and an existing road in sequence in a direction away from the river channel, and the second side of the river channel is provided with an existing road, characterized in that: The construction method includes the following steps: S1. construct a row of roadbed maintenance structures on the riverbank between the bridge foundation and the roadbed; wherein the existing retaining wall A is close to the first side of the river channel, and the bridge foundation is arranged at the step between the roadbed and the existing retaining wall A; S2. Construct a water-blocking dam in the middle of the river channel. The water-blocking dam is distributed along the length of the river channel. The water-blocking dam divides the river channel into two parts, one part is a dry water operation area, and the other part is a wet water area. The original river water in the river channel is blocked in the wet water area; S3. Demolish the existing retaining wall A near the bridge foundation; S4. Construct transverse retaining walls on both sides of the bridge foundation. The transverse retaining walls are arranged perpendicular to the length direction of the roadbed. A well-type foundation is formed between the two transverse retaining walls, the roadbed maintenance structure, and the existing retaining wall A that has not been removed. The well-type foundation frames the bridge foundation; S5. Continue to construct bridge piers on the bridge foundation; S6. Constructing a fused retaining wall in the well foundation, wherein the fused retaining wall will form a new retaining wall structure with the existing retaining walls A located on both sides of the fused retaining wall and not demolished; S7. Remove the water retaining dam and backfill the well foundation with permeable materials.

2. The construction method for building a new bridge foundation on the roadbed side adjacent to the river bank according to claim 1, characterized in that: In S1, the roadbed maintenance structure includes anti-sliding piles, baffles and crown beams, wherein the bottom of the anti-sliding piles is vertically buried below the riverbed, two adjacent anti-sliding piles are connected by baffles, and the baffles are partially inserted into the stratum.

3. The construction method for building a new bridge foundation on the roadbed side adjacent to the river bank according to claim 2, characterized in that: The roadbed maintenance structure also includes a crown beam. The crown beam is constructed on the top of the anti-sliding pile, and the top of the crown beam is exposed from the river bank.

4. The construction method for building a new bridge foundation on the roadbed side adjacent to the river bank according to claim 1, characterized in that: In S5, the caps and pile foundations of the bridge piers are buried below the riverbed.

5. The construction method for a new bridge foundation on the roadbed side adjacent to a river bank according to claim 1, characterized in that: In S5, the bridge piers and the position of the demolished existing retaining wall A interfere with each other.

6. The construction method for building a new bridge foundation on the roadbed side adjacent to the river bank according to claim 1, characterized in that: After S6, the fused retaining wall wraps the lower part of the pier column, and the fused retaining wall is disconnected from the existing retaining wall A by the expansion joint.

7. The construction method for a new bridge foundation on the roadbed side adjacent to a river bank according to claim 1, characterized in that: The space between the fusion retaining wall and the bridge pier is filled with foam boards and asphalt hemp.

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