Track traffic bridge pile protection structure system based on river channel excavation

Abstract

The utility model relates to the technical field of civil engineering, and concretely is a kind of track traffic bridge pile protection structure system based on river course excavation, including enclosure structure, retaining structure, support beam, the enclosure structure is used to enclose protection existing bridge pile, including bored pile and corbel, the bored pile of enclosure structure is arranged around the periphery of existing bridge pile;The corbel is located at the top of the bored pile, is used to connect the bored pile;The retaining structure is used to block the lateral movement of soil, including bored pile and corbel, the bored pile of retaining structure is arranged along river course and is in conformity with the soil on both sides of river course;The corbel is located at the top of the bored pile, is used to connect the boring pile;One end of the support beam is connected with the corbel of the enclosure structure, and the other end is connected with the corbel of the retaining structure.The utility model can guarantee the stability and safety of bridge pile during river course excavation construction process.

Description

Technical Field

[0001] This utility model relates to the field of civil engineering technology, specifically to a protective structure system for railway bridge piles based on river excavation. Background Technology

[0002] With the rapid development of the national economy, transportation demand is increasing, and the desire to improve the transportation capacity of railways, highways, and waterways is also constantly growing. To increase river flow during the flood season, existing artificial and canalized waterways need to be expanded to increase the cross-sectional area, usually by widening or deepening the river channel. However, due to the influence of surrounding buildings, widening the river channel requires demolition or land acquisition; therefore, dredging is more often used to deepen the channel. River excavation disturbs the soil strata, disrupting the original soil equilibrium and generating unbalanced earth pressure. This can cause additional internal forces and deformations on the pile foundations of nearby rail transit bridges, and in severe cases, even lead to structural damage and bridge instability, resulting in significant economic losses and social impact.

[0003] In the prior art, a utility model patent entitled "A Structure for Protecting Existing Bridge Piers in the Center of a Channel," publication number CN 222525309 U, discloses a pier protection structure. This structure uses concealed beams to connect support piles, forming the main structure for protecting the existing piers. However, the concealed beams are located at the bottom of the support piles, making it unsuitable for river excavation projects. The concealed beams at the bottom of the support piles would hinder the deepening of the river channel. Therefore, there is an urgent need for a bridge pier protection structure system suitable for river excavation in rail transit, which can reduce the safety impact on the existing bridge pile foundations during river excavation while not hindering the deepening of the river channel. Utility Model Content

[0004] The purpose of this utility model is to provide a bridge pile protection structure system for rail transit based on river excavation. Compared with the prior art, this utility model adopts bridge pile protection structure technology and measures during river excavation to ensure the stability and safety of the bridge piles during the river excavation construction process, while its own structure will not affect the dredging of the river.

[0005] The technical solution of this utility model is: a protection structure system for railway bridge piles based on river excavation, comprising: An enclosing structure is used to enclose and protect existing bridge piles, including bored piles and a capping beam. The bored piles of the enclosing structure are arranged around the existing bridge piles. The capping beam is located at the top of the bored piles and is used to connect the bored piles. A retaining structure for preventing lateral movement of soil includes bored piles and a capping beam. The bored piles of the retaining structure are arranged along the river channel and are in contact with the soil on both sides of the river channel. The capping beam is located at the top of the bored piles and is used to connect the bored piles. A support beam, one end of which is connected to the capping beam of the enclosing structure, and the other end of which is connected to the capping beam of the retaining structure.

[0006] According to the present invention, a protective structure system for railway bridge piles based on river excavation is provided, wherein the slurry of the bored piles is prepared using bentonite.

[0007] According to the present invention, a railway bridge pile protection structure system based on river excavation is provided, wherein the borehole diameter deviation of the bored pile does not exceed 50mm.

[0008] According to the present invention, a protective structure system for railway bridge piles based on river excavation is provided, wherein the enclosing structure includes a baffle, and the baffle of the enclosing structure is connected to the outside of the bored pile of the enclosing structure.

[0009] According to the present invention, a rail transit bridge pile protection structure system based on river excavation is provided, wherein the retaining structure includes a baffle plate, and the baffle plate of the retaining structure is connected to the outside of the bored pile of the retaining structure.

[0010] According to the present invention, a rail transit bridge pile protection structure system based on river excavation is provided, wherein the net distance between the bored piles of the enclosed structure and the existing bridge piles is not less than 3m.

[0011] According to the present invention, a rail transit bridge pile protection structure system based on river excavation is provided, which also includes a bottom plate located at the bottom of the riverbed, forming a U-shaped channel together with the retaining structure and the enclosure structure.

[0012] According to the present invention, a bridge pile protection structure system for rail transit based on river excavation is provided, wherein the concrete of the base plate is poured in layers and sections during construction.

[0013] Compared to existing technologies: This invention offers better construction convenience, with easier construction of the top support beam and convenient mutual anchoring of reinforcing bars; the existing technology's bottom concealed beam is inconvenient to construct, requiring rebar installation below the protective pile, which can damage the protective pile and make construction difficult to guarantee. This invention has better deformation control and greater overall stiffness; the existing technology results in greater deformation at the top of the protective pile, and the tie beam of the third support pile only plays a tensile role, without effectively utilizing the compressive strength of concrete.

[0014] The advantages of this utility model are: 1. The bridge pile protection structure system of this utility model can reduce the disturbance of the surrounding soil during river excavation, avoid the horizontal displacement induced by the redistribution of stress on the existing bridge piles, and thus prevent structural safety hazards such as pier deformation and bridge deck cracking, and ensure the stability and safety of the bridge piles during the river excavation construction. 2. The drilling mud of the bored pile of this utility model is prepared with bentonite, which has stable quality and excellent performance, thus ensuring the structural stability of the bridge pile protection structure system. 3. The borehole diameter deviation of the bored pile of this utility model is controlled within 50mm, which ensures the structural stability of the bored pile while avoiding disturbance to the soil layer during drilling. 4. The bridge pile protection structure system of this utility model includes multiple support beams, which connect the support enclosure structure and the retaining structure, further enhancing the overall rigidity and stability of the bridge pile protection structure system. 5. Both the enclosure structure and the retaining structure of this utility model include baffles, which can effectively block the lateral movement of the soil and prevent the soil from collapsing. At the same time, they can also serve as the sidewalls of the U-shaped channel of the river, saving investment. 6. The enclosure structure and retaining structure of this utility model also include a capping beam, which can connect the bored piles of the enclosure structure and the retaining structure together, and at the same time connect with the support beam to form an integrated support system, thereby improving the protection capability of the bridge pile protection structure system. 7. The net distance between the enclosed structure of the bored pile and the existing bridge pile is not less than 3m, which can ensure that the structure of the existing bridge pile is not affected when drilling the bored pile. 8. During construction, the concrete of the base plate of this utility model is poured in layers and sections, which can improve the structural strength and stability of the base plate. The base plate also serves as the base plate of the U-shaped channel of the river, while preventing the riverbed scouring from affecting the stability of the support structure. Attached Figure Description

[0015] To more clearly illustrate the technical solution of this utility model, the accompanying drawings used in the description of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0016] Figure 1 This is a plan view of the bridge pile protection structure of this utility model; Figure 2 This is a longitudinal section schematic diagram of the bridge pile protection structure of this utility model; Wherein: 100 - Enclosure structure; 200 - Retaining structure; 300 - Supporting beam; 1 - Existing bridge pile; 2 - Bored pile; 3 - Crown beam; 4 - Baffle plate; 5 - Base plate; Figure 1 A single arrow in the middle indicates the direction of the river; Figure 2 Multiple arrows indicate the direction of excavation. Detailed Implementation

[0017] The embodiments of this utility model are described in detail below, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain this utility model, and should not be construed as limiting this utility model.

[0018] In the description of this utility model, it should be understood that the terms "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0019] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0020] This utility model provides a bridge pile protection structure system for rail transit based on river excavation. Compared with the prior art, this utility model adopts bridge pile protection structure technology and measures during river excavation to reduce the disturbance of the surrounding soil, avoid the horizontal displacement induced by the redistribution of stress on the existing bridge piles, and thus prevent structural safety hazards such as pier deformation and bridge deck cracking, ensuring the stability and safety of the bridge piles during river excavation construction.

[0021] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments.

[0022] A bridge pile protection structure system for rail transit based on river excavation, specifically, such as... Figure 1 , 2 As shown, it includes: Enclosing structure 100 is used to enclose and protect the existing bridge pile 1, including bored pile 2 and cap beam 3. The bored pile 2 of the enclosing structure 100 is arranged around the existing bridge pile 1. The cap beam 3 is located on top of the bored pile 2 and is used to connect the bored pile 2. The retaining structure 200 is used to block the lateral movement of the soil. It includes bored piles 2 and a capping beam 3. The bored piles 2 of the retaining structure 200 are arranged along the river channel and are in contact with the soil on both sides of the river channel. The capping beam 3 is located on top of the bored piles 2 and is used to connect the bored piles 2. Support beam 300, one end of which is connected to the capping beam 3 of the enclosure structure 100, and the other end of which is connected to the capping beam 3 of the retaining structure 200.

[0023] Specifically, the technical parameters of the bored pile 2 in this embodiment are as follows: In this embodiment, the enclosing structure 100 includes multiple bored piles 2 arranged in an "O" shape around the existing bridge piers 1, and the retaining structure 200 includes multiple bored piles 2 arranged along the riverbank. The diameter and length of the bored piles 2 are determined based on geological conditions and the river excavation depth. In this embodiment, the diameter of the bored piles 2 is 1200 mm, and the spacing is 1500 mm. A dedicated mud mixer is used to prepare the mud for the bored piles 2 to ensure uniform mixing.

[0024] Preferably, in this embodiment, the drilling mud for the bored pile 2 is selected from bentonite with stable quality and excellent performance; the mud specific gravity is controlled between 1.05 and 1.25, which is adjusted according to geological conditions and construction requirements; the mud sand content is less than 4% to reduce wear on the drilling tools and damage to the borehole wall; the pH value of the mud is controlled between 8 and 10 to maintain the stability of the mud.

[0025] Preferably, a suitable drilling rig is selected for drilling based on geological conditions, pile diameter, and hole depth. During the drilling process, equipment such as inclinometers are used to monitor the verticality of the borehole in real time and make timely adjustments to ensure that the verticality deviation of the borehole does not exceed 1%.

[0026] Preferably, high-quality drilling mud is used for wall protection, and the mud injection rate should be matched with the drilling rate to ensure that the mud can fill the borehole in time and form an effective wall protection layer.

[0027] Preferably, after drilling, the final inspection stage is carried out to check the hole position, diameter, depth, and shape. The diameter deviation is controlled within ±50mm, and the hole depth is ensured to ensure that the pile end of the drilled cast-in-place pile 2 enters the bearing layer. After ensuring that the inspection is qualified, the hole cleaning work is carried out.

[0028] Preferably, the net distance between the bored pile 2 and the existing bridge pile 1 is not less than 3m, and in this embodiment, it is controlled at 5m.

[0029] Compared to ordinary support piles, bored cast-in-place piles 2: High bearing capacity; the bored pile 2 forms an integral bearing system by injecting concrete, which can effectively improve the bearing capacity of the foundation; Good construction flexibility: Drilled cast-in-place piles 2 can be designed with piles of different diameters and depths according to different geological conditions and engineering requirements, and the position and depth of the piles can be adjusted at any time during construction; Less environmental impact: Compared with traditional support piles, bored piles generate less noise and vibration during construction, resulting in less impact on the surrounding environment, making them suitable for use in urban and densely populated areas. Short construction period: The construction speed of bored pile 2 is relatively fast, which can effectively shorten the construction period and improve project efficiency; Wide range of applications: Drilled pile 2 can adapt to a variety of geological conditions and can be used in various soil layers such as fill, cohesive soil, silt, and sand.

[0030] The technical parameters of the cap beam 3 in this embodiment are as follows: The capping beam 3 is a concrete ring beam connecting the tops of the bored piles 2 in the enclosure structure 100 and the retaining structure 200. In this embodiment, the cross-section of the capping beam 3 is preferably 1200×1200mm. The capping beam 3 connects all adjacent bored piles 2 together and is also connected to the reinforced concrete support beam 300 to form an integrated support system.

[0031] The technical parameters of the supporting beam 300 in this embodiment are as follows: The support beam 300 is a 1000x1200mm reinforced concrete square beam connecting the top of the bored piles 2 between the enclosing structure 100 and the retaining structure 200. In this embodiment, the cross-section of the support beam 300 is preferably 1000x1200mm, and the spacing between the support beams 300 is 5m. The support beam 300 can effectively balance the soil pressure on the pile sides of the bored piles 2 of the retaining structures 200 on both sides, reduce pile deformation and pile top displacement, and make the U-shaped channel more stable.

[0032] In some embodiments, the enclosure structure 100 and the retaining structure 200 described above have been optimized, such as... Figure 2 As shown, the enclosure structure 100 and the retaining structure 200 also include a baffle 4. The baffle 4 of the enclosure structure 100 is connected to the outside of the bored pile 2 of the enclosure structure 100; the baffle 4 of the retaining structure 200 is connected to the outside of the bored pile 2 of the retaining structure 200.

[0033] The technical parameters of the baffle 4 in this embodiment are as follows: A baffle 4 is installed between the bored piles 2, mainly to effectively block the lateral movement of the soil and prevent soil collapse during river excavation and concrete slab 5 construction. The baffle 4 is also one of the components of the U-shaped channel. In this embodiment, the baffle 4 is preferably a 0.3m thick concrete wall.

[0034] In some embodiments, the above-mentioned rail transit bridge pile protection structure system has been optimized, such as... Figure 1 , 2 As shown, the rail transit bridge pile protection structure system also includes a bottom plate 5, which is located at the bottom of the riverbed and forms a U-shaped channel together with the retaining structure 200 and the enclosure structure 100.

[0035] The technical parameters of the base plate 5 in this embodiment are as follows: Based on the increased flood season flow rate of the river channel, the dimensions of the flow passage section and the depth of the bottom plate 5 are determined. The bottom plate 5, together with the enclosing structures 100 and retaining structures 200 on both sides, form a U-shaped channel for flow passage.

[0036] Preferably, the base plate 5 in this embodiment is a concrete base plate. The thickness and reinforcement of the concrete base plate 5 are determined according to the geological conditions of the riverbed and the excavation depth of the river channel. In this embodiment, the thickness of the concrete base plate 5 is 0.8m. The base plate 5 can effectively prevent the bottom of the river channel from being eroded and ensure the stability of the cast-in-place pile protection structure.

[0037] The specific construction of a rail transit bridge pile protection structure system based on river excavation, as described in this application, includes the following steps: Planning the dimensions of the river channel excavation: Plan the depth and width of the river channel to be excavated in advance, and determine the flow cross-section.

[0038] Construction preparation: Construction will be carried out during the dry season of the river channel to be excavated, and the construction site will be cleaned and backfilled and leveled.

[0039] Construction of bored pile 2: The inner diameter of the casing for bored pile 2 is 20-40cm larger than the designed borehole diameter, and the top of the casing is 0.3m above the ground (or 1-2m above the water surface). Adjust the drilling speed and drilling pressure according to the hardness of the strata. For hard strata, staged drilling is used, and the verticality is checked after each section of the drill rod is extended. Monitor the mud properties in real time and clean up sediment promptly to prevent borehole instability.

[0040] Construction of the capping beam 3 at the top of the pile: When there is a slope on the outer side of the top of the bored pile 2, a reinforced concrete retaining wall can be constructed on the capping beam 3 at the top of the bored pile 2 of the retaining structure 200. The reinforcing steel bars of the retaining wall need to be anchored into the capping beam 3.

[0041] Construction of support beam 300: The top surface of support beam 300 is flush with the top surface of pile cap beam 3.

[0042] Riverbed excavation: Excavate layer by layer, with each layer not exceeding 2 meters in height; in soft soil areas, this should be reduced to less than 1 meter. After excavating to the design elevation, construct the pile-to-pile retaining wall 4.

[0043] Construction of base slab 5: The concrete for base slab 5 shall be poured in layers and sections, with the thickness of each layer controlled between 300 and 500 mm. An immersion vibrator shall be used for compaction, and collisions with the reinforcing bars and formwork shall be avoided during vibration to prevent displacement of the reinforcing bars or deformation of the formwork.

[0044] Water supply and use: The concrete components of the bored pile 2, cap beam 3, baffle 4, bottom plate 5, and support beam 300 are cured and put into use after reaching the strength specified in the design.

[0045] The foregoing has shown and described the basic principles, main features, and advantages of this utility model. Those skilled in the art should understand that this utility model is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of this utility model. Various changes and modifications can be made to this utility model without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed utility model. The scope of protection of this utility model is defined by the appended claims and their equivalents.

Claims

1. A bridge pile protection structure system for rail transit based on river excavation, characterized in that, include: Enclosing structure (100) is used to enclose and protect existing bridge piles (1), including bored piles (2) and cap beams (3). The bored piles (2) of the enclosing structure (100) are arranged around the existing bridge piles (1). The cap beams (3) are located at the top of the bored piles (2) and are used to connect the bored piles (2). A retaining structure (200) is used to block the lateral movement of soil, including bored piles (2) and a capping beam (3). The bored piles (2) of the retaining structure (200) are arranged along the river channel and are in contact with the soil on both sides of the river channel. The capping beam (3) is located at the top of the bored piles (2) and is used to connect the bored piles (2). A support beam (300) is provided, with one end of the support beam (3) connected to the cap beam (3) of the enclosure structure (100) and the other end connected to the cap beam (3) of the retaining structure (200).

2. The rail transit bridge pile protection structure system based on river excavation according to claim 1, characterized in that, The slurry for the bored pile (2) is prepared using bentonite.

3. The rail transit bridge pile protection structure system based on river excavation according to claim 2, characterized in that, The borehole diameter deviation of the bored pile (2) shall not exceed 50 mm.

4. The rail transit bridge pile protection structure system based on river excavation according to claim 3, characterized in that, The net distance between the bored pile (2) and the existing bridge pile (1) shall not be less than 3m.

5. The rail transit bridge pile protection structure system based on river excavation according to claim 1, characterized in that, The enclosure structure (100) also includes a baffle (4), which is connected to the outside of the bored pile (2) of the enclosure structure (100).

6. The rail transit bridge pile protection structure system based on river excavation according to claim 1, characterized in that, The retaining structure (200) also includes a baffle (4), which is connected to the outside of the bored pile (2) of the retaining structure (200).

7. The rail transit bridge pile protection structure system based on river excavation according to claim 1, characterized in that, It also includes a bottom plate (5), which is located at the bottom of the riverbed and together with the retaining structure (200) and the enclosure structure (100) form a U-shaped channel.

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