Vibration reduction and deformation resistance steel sheet pile for deep foundation pit engineering close to existing railway line

Abstract

The utility model relates to the technical field of geotechnical engineering and railway construction, and particularly discloses a vibration reduction and deformation resistance steel sheet pile for deep foundation pit engineering close to an existing railway line, which comprises a steel sheet pile, a vertical load-bearing steel bar, a connecting component, a vibration isolation and reduction interlayer and a protective steel plate. By adopting a composite structure form of steel sheet piles, vibration isolation and reduction interlayers and vertical load-bearing steel bars, the structure reinforcing function and the vibration isolation function are organically combined, and a brand-new supporting structure system is formed; the vertical stressed steel bars are matched with the vibration isolation and reduction interlayer and the damping spring shock absorbers, the vertical stressed steel bars mainly share tensile stress to improve the stress state, the vibration isolation and reduction interlayer mainly absorbs vibration energy to weaken vibration transmission, and the comprehensive performance of the steel sheet pile is remarkably improved through the combined action of the vibration isolation and reduction interlayer and the damping spring shock absorbers; meanwhile, according to the scheme, by optimizing arrangement of the vertical load-bearing steel bars, selection of vibration isolation and reduction materials and arrangement of connecting components, the whole structure has the good reinforcing effect and vibration reduction performance, and construction convenience and economical efficiency are taken into consideration.

Description

Technical Field

[0001] This utility model relates to the fields of geotechnical engineering and railway construction technology, specifically to a vibration-damping and deformation-resistant steel sheet pile for deep foundation pit engineering near existing railway lines. Background Technology

[0002] In the construction of urban rail transit, it is common to encounter situations where deep foundation pits are excavated near existing railway lines. The dynamic loads generated by the existing railway lines during operation can significantly affect the support structures of nearby deep foundation pits, especially the steel sheet pile structures commonly used in foundation pit support.

[0003] Train loads primarily consist of two aspects: firstly, the horizontal thrust caused by the train's own weight and acceleration / deceleration; and secondly, the periodic vibration loads generated by train operation. Traditional sheet piles are prone to excessive deformation when subjected to train loads on existing lines, affecting their stability and support effectiveness, and potentially jeopardizing the safe operation of the existing line. Furthermore, the vibrations generated by train operation typically include multi-frequency vibration waves of 5-80Hz. This vibrational energy can be transmitted through the strata and sheet piles to the foundation pit, affecting not only construction safety and project quality within the pit but also having long-term dynamic impacts on the completed underground structure. This vibration transmission effect is particularly pronounced in soft soil areas, and long-term vibration can also lead to ground liquefaction and fatigue failure of the foundation pit support structure.

[0004] In existing technologies, methods such as increasing the cross-section of sheet piles, increasing the penetration depth of sheet piles, or adding horizontal supports are commonly used to improve the deformation resistance of sheet piles. However, these methods have many drawbacks: increasing the cross-section increases material consumption and project cost, with each 10% increase in cross-sectional area potentially leading to an 8%-15% increase in project cost; increasing the penetration depth is limited by construction conditions and is difficult to implement, especially in hard soil layers or gravel strata, where the penetration of sheet piles faces significant challenges; while adding horizontal supports can effectively control deformation, it severely affects the construction space and efficiency within the foundation pit, increasing the construction period and management difficulty of the project.

[0005] Meanwhile, the aforementioned traditional methods have limited effectiveness in reducing the vibration transmission of train dynamic loads. Increasing the cross-section and the depth of penetration may even enhance the vibration transmission path, making the vibration impact inside the foundation pit more severe. Although some projects have used vibration isolation trenches or barrier walls between the foundation pit and the existing line, these methods require a large amount of space, are complex to construct, and are costly, and have a significant impact on existing underground pipelines and facilities, making them difficult to apply on a large scale in densely populated urban areas. Utility Model Content

[0006] To address the shortcomings of existing technologies, this utility model provides a vibration-damping and deformation-resistant steel sheet pile for deep foundation pit engineering near existing railway lines. It can solve the deformation control problem of steel sheet piles, reduce the impact of existing train vibrations on the interior of the foundation pit, and at the same time, it does not significantly increase the project cost or construction difficulty.

[0007] To achieve the above objectives, this utility model provides the following technical solution: a vibration-damping and deformation-resistant steel sheet pile for deep foundation pit engineering near an existing railway line, comprising steel sheet piles, vertical reinforcing bars, connecting components, vibration-damping interlayers, and protective steel plates. The steel sheet piles are arranged vertically along the edge of the foundation pit to form a support structure. The vertical reinforcing bars are located in the tension zone on the side of the steel sheet pile adjacent to the existing railway line, and multiple parallel vertical reinforcing bars are arranged on both sides of each steel sheet pile. The vertical reinforcing bars are directly connected to the steel sheet piles by welding. Vibration-damping interlayers are provided on both the concave and convex surfaces of the steel sheet piles, and the vibration-damping interlayers are arranged vertically and vertically. Several damping spring dampers are provided, and a protective steel plate is attached to the surface of the vibration isolation and damping interlayer. The upper and lower ends of the protective steel plate are welded and fixed to one side of the upper and lower connecting components, respectively. One side of each of the damping spring dampers 7 is fixedly connected to the sheet pile 1 by bolt groups, and the output end of each of the damping spring dampers 7 is engaged with one side of the protective steel plate 6 against the vibration isolation and damping interlayer 5. The protective steel plate is attached to the surface of the vibration isolation and damping interlayer and has a thickness of 5mm. The insertion end of the sheet pile is provided with an upward bevel. The connecting components connect the protective steel plate to the sheet pile and the vertical reinforcing steel, so that multiple components form an integral load-bearing component.

[0008] Preferably, the vertical reinforcing bars are HRB400 grade steel bars with a diameter of 25mm-40mm, and the number of vertical reinforcing bars is 4-12.

[0009] Preferably, the vertical reinforcing bars extend from the top of the sheet pile to above the upper oblique angle at the bottom of the sheet pile.

[0010] Preferably, the thickness of the vibration isolation and damping interlayer matches the diameter of the vertical reinforcing steel bars.

[0011] Preferably, the connecting member is a welded steel plate or a stud connector, which connects the protective steel plate to the sheet pile and the vertical reinforcing steel bars as a whole. The connecting members are evenly arranged along the length of the vertical reinforcing steel bars with a spacing of 500mm-1000mm.

[0012] Preferably, the connection between the vertical reinforcing bars at the top and bottom of the sheet pile is reinforced to enhance the connection rigidity, and the upper angle of the insertion end of the sheet pile is 15°.

[0013] Preferably, the protective steel plate is a component made of Q235 steel.

[0014] Preferably, a connecting frame is welded and fixed to one side of the protective steel plate on the convex surface of the sheet pile, and a supporting steel frame is bolted inside the connecting frame. Two adjacent protective steel plates on the same side are connected by a supporting steel frame.

[0015] Beneficial effects

[0016] This utility model provides a vibration-damping and deformation-resistant steel sheet pile for deep foundation pit engineering near existing railway lines. Compared with the prior art, it has the following advantages:

[0017] (1) This utility model adopts a composite structure of “steel sheet pile-vibration isolation and damping interlayer-vertical reinforcing steel”, which organically combines structural reinforcement and vibration isolation functions to form a brand-new support structure system. By setting up a vibration isolation and damping interlayer and several damping spring shock absorbers, the elasticity of the vibration isolation and damping interlayer and the damping characteristics of the damping spring shock absorbers are utilized to effectively absorb and consume vibration energy, reduce the transmission of train dynamic load to the foundation pit structure, play a role in vibration isolation and damping, and protect the construction environment inside the foundation pit. At the same time, by optimizing the arrangement of vertical reinforcing steel, the selection of vibration isolation and damping materials and the setting of connecting components, the overall structure has both good reinforcement effect and vibration reduction performance, while also taking into account construction convenience and economy. The structure of the vibration-damping and deformation-resistant steel sheet pile is simple and clear, and the construction process is similar to that of conventional steel sheet pile support, which is convenient for promotion and application in engineering practice and does not occupy the construction space inside the foundation pit. The specifications and quantity of vertical reinforcing steel, the type and thickness of vibration isolation and damping materials can be adjusted according to specific engineering conditions and requirements to adapt to different working conditions and load conditions.

[0018] (2) By arranging vertical reinforcing bars on both sides of the sheet pile, the tensile stress of the sheet pile is effectively distributed, the overall bending resistance of the sheet pile is improved, and the deformation of the sheet pile under the load of the existing line train is reduced. According to theoretical analysis and test results, this reinforcement method can reduce the maximum deformation of the sheet pile by 30%-50%. By setting up a vibration isolation and damping interlayer and several damping spring shock absorbers, the elasticity of the vibration isolation and damping interlayer and the damping characteristics of the damping spring shock absorbers are utilized to effectively absorb and consume vibration energy, reduce the transmission of train dynamic load to the foundation pit structure, play a role in vibration isolation and damping, and protect the construction environment in the foundation pit. Compared with traditional methods such as increasing the cross section of the sheet pile or increasing the embedment depth, this utility model has a simple structure, is easy to construct, does not require special equipment and processes, and can significantly reduce the amount of materials used and the project cost.

[0019] (3) Through the structural design of this scheme, it not only avoids occupying the internal space of the foundation pit and does not affect the normal construction operation in the foundation pit, but also improves the construction efficiency and quality; at the same time, the reduced vibration transmission also creates better environmental conditions for precision construction in the foundation pit; the specifications and quantity of vertical reinforcing bars and the type and thickness of vibration isolation and damping materials can be flexibly adjusted according to the needs of the project, which has strong engineering adaptability and is suitable for foundation pits of different depths, different types of strata conditions and existing line conditions with different load characteristics; at the same time, it solves the dual requirements of steel sheet piles for deformation resistance and vibration isolation and damping, improves the comprehensive performance of the support structure, effectively ensures the safety of existing railway lines and foundation pit projects, and has significant engineering application value and social benefits. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of a vibration-damping and deformation-resistant steel sheet pile structure for a deep foundation pit project near an existing railway line, as described in this utility model embodiment.

[0021] Figure 2 This is a schematic diagram of the steel sheet pile and vertical reinforcing steel structure in an embodiment of this utility model;

[0022] Figure 3 This utility model Figure 2 Schematic diagram of the cross-sectional structure of the middle AA section;

[0023] Figure 4 This utility model Figure 2 Schematic diagram of the cross-sectional structure of the middle BB;

[0024] Figure 5 This is a schematic diagram of the existing railway line and sheet pile structure in the embodiment of this utility model.

[0025] In the diagram: 1. Sheet pile; 2. Vertical reinforcing steel; 3. Connecting components; 4. Existing railway line; 5. Vibration isolation and damping interlayer; 6. Protective steel plate; 7. Damping spring shock absorber; 8. Connecting frame; 9. Supporting steel frame. Detailed Implementation

[0026] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0027] Example 1

[0028] Please see Figure 1-5As shown in the figure, this embodiment proposes a vibration-damping and deformation-resistant steel sheet pile for deep foundation pit engineering near an existing railway line, including steel sheet piles 1, vertical reinforcing bars 2, connecting members 3, vibration isolation and damping interlayer 5, and protective steel plate 6; the steel sheet piles 1 are arranged vertically along the edge of the foundation pit to form a support structure, and adjacent steel sheet piles 1 are connected by interlocking. The vertical reinforcing bars 2 are set in the tension zone on the side of the steel sheet pile 1 near the existing railway line 4, and multiple parallel vertical reinforcing bars 2 are arranged on both sides of each steel sheet pile.

[0029] It should be noted that two adjacent sheet piles 1 are connected by a U-shaped interlocking structure. The U-shaped interlocking structure is divided into a male and a female joint. The connection between two adjacent sheet piles 1 is achieved by nesting the male and female joints. In the practical application of this embodiment, four main reinforcing bars can be set on both sides according to the load size and the width of the sheet pile 1. By arranging vertical reinforcing bars 2 on both sides of the sheet pile 1, the tensile stress of the sheet pile 1 can be effectively distributed, the overall bending resistance of the sheet pile 1 can be improved, and the deformation of the sheet pile 1 under the load of existing trains can be reduced.

[0030] Specifically, multiple connecting members 3 are welded to the upper and lower parts of the concave and convex surfaces of the sheet pile 1, and the upper and lower ends of the vertical reinforcing bars 2 are directly connected to the upper and lower connecting members 3 by welding. The middle part of the surface of the vertical reinforcing bars 2 is directly welded to the sheet pile 1. The connecting members 3 connect the sheet pile 1 and the vertical reinforcing bars 2, so that multiple members form an integral load-bearing member, forming a solid overall structure of the sheet pile 1, connecting members 3, and vertical reinforcing bars 2. The concave and convex surfaces of the sheet pile 1 are provided with vibration isolation and damping interlayers 5, and several damping spring shock absorbers 7 are distributed vertically inside the vibration isolation and damping interlayers 5 to protect the steel plate 6 attached to the vibration isolation and damping interlayers. The protective steel plate 6 is welded and fixed to one side of the connecting member 3 above and below, respectively, on the surface of layer 5. One side of several damping spring shock absorbers 7 is fixed to the sheet pile 1 by bolt groups, and the output end of several damping spring shock absorbers 7 is engaged with one side of the vibration isolation and damping interlayer 5 of the protective steel plate 6. The protective steel plate 6 is 5mm thick and is used to protect the vibration isolation and damping interlayer 5 from damage during the installation of the sheet pile. The insertion end of the sheet pile 1 is also provided with an upward bevel to facilitate the installation and reduce the resistance to insertion. The connecting member 3 connects the protective steel plate 6 to the sheet pile 1 and the vertical reinforcing steel bar 2, so that multiple components form an integral load-bearing component.

[0031] Specifically, the damping spring damper 7 consists of a spring, a damper, and a damper housing. Both the spring and the damper are installed inside the damper housing, with the damper located inside the spring. The specific structure of the damping spring damper 7 will not be elaborated here, and commercially available damping spring dampers 7 can be used. In addition, the vibration isolation and damping interlayer 5 uses vibration isolation and damping materials commonly used in existing engineering projects. Specifically, it can use one or more combinations of rubber elastomers, polyurethane elastomers, elastic polymer materials, foam materials, or composite vibration isolation materials.

[0032] It should be noted that by adopting a composite structure of "steel sheet piles - vibration isolation and damping interlayer - vertical reinforcing steel", structural reinforcement and vibration isolation functions are organically combined to form a brand-new support structure system. The vertical reinforcing steel 2, the vibration isolation and damping interlayer 5, and several damping spring dampers 7 work together. The vertical reinforcing steel 2 mainly shares the tensile stress and improves the stress state, while the vibration isolation and damping interlayer 5 and several damping spring dampers 7 mainly absorb vibration energy and weaken vibration transmission. The combined effect of the above structures significantly improves the comprehensive performance of the steel sheet pile 1. By setting up the vibration isolation and damping interlayer 5 and several damping spring dampers 7, the elasticity of the vibration isolation and damping interlayer 5 and the damping characteristics of the damping spring dampers 7 are used to effectively absorb and consume vibration energy, weaken the transmission of train dynamic load to the foundation pit structure, play a role in vibration isolation and damping, and protect the construction environment inside the foundation pit.

[0033] In this embodiment, the vertical reinforcing bars 2 are HRB400 grade steel bars with a diameter of 32mm. Their length extends from the top of the sheet pile to above the upper inclined angle at the bottom of the sheet pile, the same as the length of the sheet pile 1. When four main reinforcing bars are selected, the vertical reinforcing bars 2 are located on the surfaces of the sheet pile 1 on both sides, and the distance between adjacent vertical reinforcing bars 2 is 1 / 2 the width of the sheet pile 1. When three or more vertical reinforcing bars 2 are selected, each vertical reinforcing bar 2 is evenly distributed on the tension side of the sheet pile 1 to fully utilize the function of the vertical reinforcing bars 2. The vertical reinforcing bars 2 are directly welded to the sheet pile 1 through a weld with a weld width of 10mm using E43 welding rods to ensure that the connection strength meets the stress requirements.

[0034] The vibration isolation and damping interlayer 5 has a thickness of 32mm, which matches the diameter of the vertical reinforcing steel bar 2. Through the cooperation between the vibration isolation and damping interlayer 5 and several damping spring dampers 7, the vibration transmission can be effectively reduced while maintaining sufficient stiffness. The vibration isolation and damping interlayer 5 covers the entire tension zone of the sheet pile 1 on the side adjacent to the existing railway line. It not only fills the groove formed by the reinforcing steel bar 2 and the sheet pile 1, but also extends to the entire tension side surface.

[0035] The protective steel plate 6 is a component made of Q235 steel with a thickness of 5mm. It is fixed to the outer surface of the vibration isolation and damping interlayer 5 by spot welding, forming an effective protective layer for the vibration isolation and damping interlayer 5. One side of the protective steel plate 6 completely covers one side of the vibration isolation and damping interlayer 5, ensuring that the vibration isolation and damping interlayer 5 is not damaged during the insertion of the sheet pile 1 into the stratum. The insertion end of the sheet pile 1 is provided with an upward inclined angle of 15° to reduce insertion resistance and improve construction efficiency.

[0036] The connecting member 3 is a welded steel plate with a thickness of 10mm and a width of 100mm. Alternatively, the connecting member 3 can also be a stud connector. The protective steel plate 6 is connected to the sheet pile 1 and the vertical reinforcing bar 2 as a whole by welding. The connecting member 3 is evenly arranged along the length of the vertical reinforcing bar 2 with a spacing of 800mm. At the connection of the vertical reinforcing bar 2 at the top and bottom of the sheet pile 1, thicker connecting steel plates and longer welds are used to enhance the connection rigidity.

[0037] A connecting frame 8 is fixedly installed on one side of the protective steel plate 6 on the convex surface of the sheet pile 1 by welding, and a supporting steel frame 9 is bolted inside the connecting frame 8. Two adjacent protective steel plates 6 on the same side are connected by a supporting steel frame 9. When the sheet pile 1 is being constructed, after the sheet pile 1 is inserted into the construction area, the supporting steel frame 9 is used to support and limit the connection between adjacent protective steel plates 6 on the same side, thereby ensuring the overall stability of the sheet pile 1 after construction.

[0038] Example 2

[0039] The working principle of this utility model is as follows: When a train passes on the existing railway line 4, it will generate a dynamic load on the nearby deep foundation pit support structure, causing the steel sheet pile 1 to bend and deform, and at the same time, the vibration will be transmitted into the foundation pit. Under such circumstances, the tension side of the traditional steel sheet pile will generate a large tensile stress, resulting in a large deformation of the steel sheet pile, and the vibration will be directly transmitted into the foundation pit.

[0040] This invention utilizes multiple vertical reinforcing bars 2 arranged on the tension side of the sheet pile 1. When the sheet pile 1 bends under train load, the vertical reinforcing bars 2 bear part of the tensile stress, reducing the tensile stress on the sheet pile 1 and thus reducing its deformation, thereby improving the rigidity and stability of the overall support structure. By setting multiple reinforcing bars, greater load-bearing capacity and more uniform stress distribution can be provided according to different working conditions. At the same time, the vibration isolation and damping interlayer 5 plays an elastic buffering role during the stress process, assisting in bearing part of the load on the one hand, and effectively blocking and weakening the transmission of train vibration on the other hand, achieving the effect of vibration isolation and damping. The protective steel plate 6 not only protects the vibration isolation and damping interlayer 5 from damage during construction, but also further enhances the rigidity and stability of the overall structure.

[0041] In summary, compared with the prior art, this utility model has the following beneficial effects:

[0042] 1. According to the design requirements, multiple vertical reinforcing bars 2 are welded along the edge of the tension side of the sheet pile 1 to effectively share the tensile stress of the sheet pile 1, improve the overall bending resistance of the sheet pile 1, and reduce the deformation of the sheet pile 1 under the load of the existing line train.

[0043] 2. Vibration isolation and damping material is laid in the groove formed by the vertical reinforcing steel bar 2 and the sheet pile 1 and on the tension side surface of the sheet pile 1 to form a vibration isolation and damping interlayer 5. At the same time, several damping spring shock absorbers 7 are distributed vertically inside the vibration isolation and damping interlayer 5. By setting the vibration isolation and damping interlayer 5 and several damping spring shock absorbers 7, the elasticity of the vibration isolation and damping interlayer 5 and the damping characteristics of the damping spring shock absorbers 7 are utilized to effectively absorb and consume vibration energy, reduce the transmission of train dynamic load to the foundation pit structure, play a role in vibration isolation and damping, and protect the construction environment inside the foundation pit.

[0044] 3. The protective steel plate 6 is covered on the surface of the vibration isolation and damping interlayer 5, and the protective steel plate 6, the vertical reinforcing steel 2 and the steel sheet pile 1 are connected as a whole by the connecting component 3. The composite structure of "steel sheet pile-vibration isolation and damping interlayer-vertical reinforcing steel" is adopted, which organically combines the structural reinforcement and vibration isolation functions to form a brand-new support structure system.

[0045] 4. The insertion end of the steel sheet pile 1 is processed to set an upward bevel angle, which facilitates construction insertion, reduces insertion resistance, and improves construction efficiency.

[0046] This scheme optimizes the arrangement of vertical reinforcing bars 2, the vibration isolation and damping interlayer 5, the damping spring shock absorber 7, and the connecting components 3, so that the overall structure has both good reinforcement effect and vibration reduction performance, while also taking into account construction convenience and economy. The structure of the vibration-damping and deformation-resistant steel sheet pile 1 is simple and clear, and the construction process is similar to that of conventional steel sheet pile support, which is easy to promote and apply in engineering practice, and does not occupy the construction space inside the foundation pit. The specifications and quantity of vertical reinforcing bars 2, the type and thickness of vibration isolation and damping materials can be adjusted according to specific engineering conditions and requirements to adapt to different working conditions and load conditions.

[0047] Furthermore, any content not described in detail in this specification is existing technology known to those skilled in the art.

[0048] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0049] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A vibration reduction and deformation resistance steel sheet pile for deep foundation pit engineering adjacent to an existing railway line, comprising a steel sheet pile, vertical force steel bars, connecting members, a vibration isolation and reduction interlayer, and a protective steel plate, characterized in that, The steel sheet pile is arranged along the edge of the foundation pit to form a supporting structure; the vertical stress reinforcement is arranged on the side of the steel sheet pile close to the existing railway line in the tension area, and multiple parallel vertical stress reinforcements are arranged on both sides of each steel sheet pile; the vertical stress reinforcement is directly connected with the steel sheet pile by welding; the concave surface and the convex surface of the steel sheet pile are provided with a vibration isolation and damping interlayer, and a plurality of damping spring shock absorbers are arranged inside the vibration isolation and damping interlayer in an up-down distribution, the protective steel plate is attached to the surface of the vibration isolation and damping interlayer, and the upper and lower ends of the protective steel plate are respectively welded and fixed to one side of the upper and lower connecting members, one side of the plurality of damping spring shock absorbers is fixedly connected with the steel sheet pile through a bolt set, and the output ends of the plurality of damping spring shock absorbers are clamped and connected to one side of the vibration isolation and damping interlayer to which the protective steel plate is attached; the protective steel plate is attached to the surface of the vibration isolation and damping interlayer, and the thickness is 5mm; the insertion end of the steel sheet pile is provided with an upper inclined angle; the connecting member connects the protective steel plate, the steel sheet pile and the vertical stress reinforcement to form an overall force component.

2. The vibration reduction and deformation resistance steel sheet pile of the deep foundation pit project adjacent to the existing railway line according to claim 1, characterized in that, The vertical stress reinforcement is an HRB400 grade steel bar with a diameter of 25mm-40mm, and the number of vertical stress reinforcements is 4-12, and the vertical stress reinforcement extends from the top of the steel sheet pile to above the upper inclined angle of the bottom of the steel sheet pile.

3. The vibration reduction and deformation resistance steel sheet pile of the deep foundation pit engineering adjacent to the existing railway line according to claim 1, characterized in that, The damping spring shock absorber is composed of a spring, a damper and a shock absorber shell, and the spring and the damper are installed inside the shock absorber shell, and the damper is arranged inside the spring.

4. The vibration reduction and deformation resistance steel sheet pile of the deep foundation pit project adjacent to the existing railway line according to claim 1, characterized in that, The thickness of the vibration isolation and damping interlayer matches the diameter of the vertical stress reinforcement.

5. The vibration reduction and deformation resistance steel sheet pile of the deep foundation pit engineering adjacent to the existing railway line according to claim 1, characterized in that, The connecting member is a welded steel plate or a bolted connector that connects the protective steel plate, the steel sheet pile and the vertical stress reinforcement as a whole, and the connecting member is uniformly arranged along the length direction of the vertical stress reinforcement with a spacing of 500mm-1000mm.

6. The vibration reduction and deformation resistance steel sheet pile of a deep foundation pit project adjacent to an existing railway line according to claim 1, characterized in that, The upper inclined angle of the insertion end of the steel sheet pile is 15°.

7. The vibration reduction and deformation resistance steel sheet pile of the deep foundation pit engineering adjacent to the existing railway line according to claim 1, characterized in that, The protective steel plate is a component of Q235 steel material.

8. The vibration reduction and deformation resistance steel sheet pile of the deep foundation pit project adjacent to the existing railway line according to claim 1, characterized in that, The side of the protective steel plate on the convex surface of the steel sheet pile is also welded and fixed with a connecting frame, and a supporting steel frame is connected inside the connecting frame by bolts, and the adjacent two protective steel plates on the same side are connected by a supporting steel frame.

Images