An auxiliary device for driving a steel sheet pile close to an existing structure and a construction method

Abstract

The application discloses a kind of close existing structure steel sheet pile setting auxiliary device and construction method, comprising: fixed frame, including with existing structure parallelly arranged two lateral rails, between its and existing structure are equipped with several vibration-absorbing connecting parts for connection, and vibration-absorbing connecting part is equipped with damping member at the junction with lateral rail;Guiding and positioning device, it is arranged in the inside of two lateral rails, and along lateral rail sliding, for the setting of steel sheet pile is guided and positioned;In guiding and positioning device interior is equipped with the guiding channel extending along vertical direction, and the entry end of guiding channel is equipped with at least a pair of guiding roller for clamping and guiding steel sheet pile into guiding channel, and guiding channel is further equipped with the positioning stop portion for the side of steel sheet pile is positioned.The application is connected by buffering by three-dimensional dead angle free geometric limiting, completely block setting vibration and destroy adjacent structure, while greatly improve the setting precision and continuous operation efficiency of steel sheet pile in narrow space.

Description

Technical Field

[0001] This application belongs to the field of building construction technology, and in particular relates to an auxiliary device and construction method for driving sheet piles close to existing structures such as buildings and bridges. Background Technology

[0002] In municipal and industrial engineering projects such as urban renewal, river management, and deep foundation pit support, steel sheet piles have been widely used as a highly efficient and high-strength retaining structure. However, with the increase in urban construction density, construction space is severely restricted, often requiring the installation of steel sheet piles in extremely narrow areas adjacent to existing structures (such as building exterior walls, bridge piers, and existing underground pipeline retaining walls).

[0003] When the construction area is adjacent to existing structures, the traditional sheet pile driving method has the following two major problems:

[0004] Traditional pile driving or pile pressing equipment generates strong vibrations and stress waves during construction, posing a high risk of damage to existing structures. In confined spaces, this energy, lacking buffering, is directly transmitted to existing structures through the soil or mechanical rigidity, easily leading to cracks in building walls, spalling and peeling of concrete from bridge piers, and even uneven settlement of structures, posing significant safety hazards.

[0005] Because of their proximity to the wall, conventional large-scale guide frames and other auxiliary equipment are simply too bulky to be erected. Without a stable directional guidance structure, sheet piles are highly susceptible to deviation during drive due to lateral soil resistance and local boulders, making it difficult to control driving accuracy. Verticality deviations often exceed 3‰, and the spacing error between adjacent piles is often greater than 20mm. This not only makes it difficult for the overall seepage prevention and load-bearing performance of the support structure to meet the specifications, easily leading to later foundation pit instability, but also, when the deviated sheet piles are corrected or forcibly driven in, they are prone to directly colliding with and compressing existing structures, causing catastrophic structural damage.

[0006] Therefore, how to provide a steel sheet pile driving auxiliary device that is compact, can be safely and flexibly connected to existing structures, and has high-precision positioning guidance, vibration isolation and buffering, and reusable functions is a technical bottleneck that urgently needs to be overcome in the field of prefabricated foundation pit support. Summary of the Invention

[0007] The purpose of this application is to overcome the shortcomings of the prior art and provide a simple structure, high positioning accuracy, and effective isolation of pile driving vibration and protection of existing structures for the installation of sheet piles close to existing structures, as well as a construction method.

[0008] To solve at least one of the above-mentioned technical problems, the technical solution adopted in this application is:

[0009] An auxiliary device for driving sheet piles close to existing structures includes:

[0010] A fixed frame includes two transverse guide rails arranged parallel to an existing structure, and a plurality of vibration-damping connection parts for connection between the frame and the existing structure. Vibration-damping components are provided at the connection points between the vibration-damping connection parts and the transverse guide rails.

[0011] A guiding and positioning device is disposed inside the two transverse guide rails and slides along the transverse guide rails to guide and limit the driving of the steel sheet piles.

[0012] The guide positioning device has a guide channel extending vertically inside. The entrance end of the guide channel is provided with at least one pair of guide rollers for clamping and guiding the sheet pile into the guide channel. The guide channel is also provided with a positioning stop for limiting the side of the sheet pile.

[0013] Furthermore, the vibration damping connection includes a connecting beam that is vertically connected to the existing structure and the transverse guide rail, and the vibration damping element is a damping pad.

[0014] Furthermore, the fixed frame also includes several height-adjustable support legs, and the transverse guide rail is fixed on the support legs; the support legs are used to adjust the levelness, elevation and support stability of the transverse guide rail;

[0015] Preferably, the side of the transverse guide rail is provided with a plurality of adjustment holes for connecting with the guide positioning device, and the adjustment holes are elongated holes.

[0016] Furthermore, the guiding and positioning device also includes a rectangular support frame, with several fixing plates that cooperate with the transverse guide rail at the bottom side of the support frame. The fixing plates have through holes, and bolts are passed through the through holes and the adjustment holes in sequence to lock and fix the support frame and the transverse guide rail.

[0017] Furthermore, the support frame is provided with two sets of guide channels for the reverse arrangement of the sheet piles; the guide channels include an upper channel formed by two sets of aligning guide rollers and a lower channel formed by several lower limiting members located below the upper channel.

[0018] Furthermore, the cross-section of the sheet pile is a C-shaped zigzag structure with the opening facing outwards, including a flat section and inclined sections located on both sides of the flat section, and the flat section and the inclined section are integrally formed; the guide roller contacts the flat section; the lower limiting member contacts the flat section and the inclined section.

[0019] Furthermore, the upper channel also includes two sets of long roller connecting rods and short roller connecting rods for fixing the guide rollers. The long roller connecting rods and the short roller connecting rods are respectively connected to the support frame through fixing blocks; the position of the fixing blocks corresponds to the position of the through holes.

[0020] Furthermore, a vertical frame is provided at the end of each of the long idler roller links and the short idler roller links near the guide roller, and an alignment guide baffle is provided between the opposing vertical frames, both inclined toward the guide roller, to guide the sheet pile into the upper channel.

[0021] Furthermore, the lower channel is located on the lower inner side of the guide channel, and the lower limiting member includes a long lower limiting member that contacts the flat section surface and a short lower limiting member that contacts the inclined section surface; the head of the long lower limiting member and the head of the short lower limiting member are both provided with guide blocks for guiding.

[0022] Preferably, the short lower limiting member is on the same side as the short idler roller connecting rod and is located outside the short idler roller connecting rod; the guide blocks of the short lower limiting member are all arranged facing the inclined section surface.

[0023] Preferably, the long lower limiting member is on the same side as the long idler roller connecting rod and is located at the lower middle position of the long idler roller connecting rod;

[0024] Preferably, the positioning stop is a positioning strip fixed to the side of the guide channel, used to align the side of the sheet pile.

[0025] A construction method for a sheet pile driving auxiliary device close to an existing structure, as described above, includes the following steps:

[0026] S1. Measure and lay out the lines according to the design drawings, fix the connecting beam on the existing structure, connect the connecting beam to the transverse guide rail on one side of the fixed frame, and clamp the vibration damping component between the two connection surfaces. Adjust the adjusting legs at the bottom of the fixed frame to calibrate the levelness of the connecting beam and the transverse guide rail.

[0027] S2. Assemble the guide positioning device onto the transverse guide rail, move the guide positioning device laterally to the target construction position, and lock and fix the fixing plate on the support frame of the guide positioning device used to fix the guide roller to the transverse guide rail with bolts.

[0028] S3. Hoist the sheet pile, so that the sheet pile enters between the guide rollers under the guidance of the alignment guide baffle above the guide roller, and the side of the sheet pile is attached to the positioning baffle set on the edge of the support frame. The verticality of the sheet pile is checked and fine-tuned by the lower limiting member in the guide channel.

[0029] S4. Use a pile driver to drive the steel sheet piles vertically and steadily into the soil; take two steel sheet piles as a group, after completing one group of driving, loosen the bolts, move the guide positioning device to the next group of construction positions, reposition and lock it, and continue driving the next group of steel sheet piles until all steel sheet piles are driven.

[0030] This application discloses an auxiliary device and construction method for driving sheet piles close to existing structures. Through a buffer isolation design, it effectively blocks the damage to existing structures caused by pile driving vibrations, avoiding potential hazards such as wall cracking and pier damage. Simultaneously, it achieves high-precision directional guidance, ensuring minimal deviation between the verticality and planar position of the sheet piles, meeting the support stress requirements. The auxiliary device proposed in this application has a simple structure and integrates guidance and positioning functions, reducing manual intervention, simplifying operation, increasing construction efficiency, and allowing for reuse. It significantly improves the safety and quality stability of construction close to existing structures. Attached Figure Description

[0031] Figure 1 An overall top view of a sheet pile driving auxiliary device for existing structures provided in an embodiment of this application;

[0032] Figure 2 An overall front view of a sheet pile driving auxiliary device for existing structures provided in an embodiment of this application;

[0033] Figure 3 An overall side view of a sheet pile driving auxiliary device close to an existing structure, provided in an embodiment of this application;

[0034] Figure 4 An enlarged front view of a fixed frame structure provided in an embodiment of this application;

[0035] Figure 5 This is a top view of the structure of a guiding and positioning device provided in an embodiment of this application;

[0036] Figure 6 for Figure 3 A magnified schematic diagram of the local structure after being sectioned along the AA direction;

[0037] Figure 7 This is a side view of the structure of a guide and positioning device provided in an embodiment of this application.

[0038] In the diagram: 1. Existing structure; 2. Vibration damping connection; 21. Connecting beam; 22. Damping pad; 3. Guide channel; 4. Fixed frame; 41. Adjustable support leg; 42. Transverse guide rail; 5. Guide positioning device; 51. Support frame; 52. Fixing plate; 53. Bolt; 54. Fixing block; 55. Idler roller connecting rod; 56. Guide roller; 57. Guide baffle; 58. Lower limiting component; 59. Positioning stop bar; 510. Vertical frame; 6. Steel sheet pile. Detailed Implementation

[0039] The present application will now be described in detail with reference to the accompanying drawings and specific embodiments.

[0040] This embodiment proposes an auxiliary device for driving sheet piles close to existing structures, such as... Figure 1 As shown, the device mainly includes a fixed frame 4 arranged parallel to the existing structure 1, a vibration-damping connection 2 set between the existing structure 1 and the fixed frame 4, and a guide positioning device 5 slidably arranged along the length of the fixed frame 4. Inside the guide positioning device 5, there is a guide channel 3 extending vertically. At least one pair of guide rollers 56 are provided at the entrance end of the guide channel 3 for clamping and guiding the sheet piles 6 into the guide channel 3. The guide channel 3 also has positioning stops for limiting the sides of the sheet piles 6. The vibration-damping connection 2 provides buffering and isolation, effectively preventing damage to the existing structure 1 from pile driving vibrations and avoiding potential hazards such as wall cracking and pier damage. Simultaneously, it achieves high-precision directional guidance, ensuring that the verticality and planar position deviation of the sheet piles 6 are minimal, meeting the support force requirements. The auxiliary device proposed in this application integrates guidance and positioning functions, not only reducing manual intervention, simplifying operation, and increasing construction efficiency, but also allowing for reuse. In this application, the existing structure 1 can be, for example, a concrete shear wall, the outer wall of a bridge pier, or an existing concrete retaining wall for deep foundation pits.

[0041] like Figure 1 , Figure 2 , Figure 4As shown, the fixed frame 4 includes two transverse guide rails 42 that are parallel to and extend laterally with the existing structure 1, and several adjustable legs 41 for supporting and fixing the transverse guide rails 42. To ensure that the device can be properly leveled and obtain stable downward vertical support on rough, uneven, or even sloping soft soil surfaces, adjustable legs 41 with vertical threaded connections are provided at the four corners of the transverse guide rails 42 on both sides. Additionally, depending on the length of the transverse guide rails 42, additional adjustable legs 41 can be added at their midpoints; the number can be determined based on actual conditions, and all adjustable legs 41 are symmetrically arranged on the transverse guide rails 42 on both sides. The adjustable legs 41 are mainly used to adjust the levelness, elevation, and support stability of the transverse guide rails 42. By manually rotating the sleeve of the outrigger 41 with a wrench, its vertical extension or shortening can be controlled independently, thereby performing double leveling and adjustment of the main frame 42 on the pile driving construction axis, ensuring that the base remains stable under subsequent vibration and downward load, without shaking or sliding.

[0042] Of course, the adjustable outrigger 41 is a conventional pull-out adjustment structure that can be used to adjust its height in the prior art, and can be connected by stacking square or round tubes commonly used on construction sites.

[0043] The vibration damping connection 2 includes a connecting beam 21 composed of several steel profiles, fixedly connected between the existing structure 1 and the transverse guide rail 42. The connecting beam 21 is a profile structure, and expansion bolts or chemical anchors can be used to securely lock it to the existing structure 1 and the transverse guide rail 42 through mounting holes at both ends of the connecting beam 21. A damping element, namely a damping pad 22, is added at the connection between the connecting beam 21 and the transverse guide rail 42. In this embodiment, the connecting beam 21 is vertically connected to the existing structure 1 and the transverse guide rail 42; its number and layout can be determined based on actual conditions and are not specifically limited here. The damping pad 22 is a vibration-damping energy-dissipating pad made of polyurethane rubber, high-elasticity neoprene rubber, or silicone rubber. Through the micro-amplitude shear elastic deformation of the high-damping elastomer, it converts the high-frequency impact stress and forced mechanical vibration transmitted in the reverse direction through the fixed frame 4 into heat energy dissipation, thus protecting the existing structure 1 and isolating vibration.

[0044] like Figure 2As shown, the transverse guide rail 42 consists of two parallel H-beams or I-beams, connected at both ends by strips to form a stable frame structure, ensuring that the device does not shake or shift during installation. Several spaced adjustment holes are provided on the sides of the transverse guide rails 42. These adjustment holes are elongated and are mainly used for temporary fixing to the fixing block 54 in the guide positioning device 5. The adjustment holes on both sides of the transverse guide rails 42 are symmetrically positioned, and the adjustment holes closer to the connecting beam 21 are staggered from the installation position of the connecting beam 21 to avoid interference or obstruction during the installation of the guide positioning device 5.

[0045] like Figure 3 , Figure 5 As shown, the guide positioning device 5 is located inside the two transverse guide rails 42 and slides along the transverse guide rails 42. It is mainly used to guide and limit the installation of the sheet piles 6.

[0046] Specifically, the guide positioning device 5 includes a rectangular support frame 51 assembled from four channel steels welded together. This support frame has a hollow, rectangular "U"-shaped structure, which together form a guide channel 3 extending vertically in space. Several fixing plates 52 are provided on the bottom side of the support frame 51, which cooperate with the transverse guide rail 42. The fixing plates 52 have through holes. Bolts 53 pass through the through holes and adjustment holes in sequence, connecting the fixing plates 52 and the transverse guide rail 42 in series. This locks the support frame 51 to the transverse guide rail 42, temporarily fixing the guide positioning device 5 to the fixed frame 4.

[0047] like Figure 5 As shown, the support frame 51 has two sets of guide channels 3, which are arranged side by side and interconnected, to simultaneously accommodate two sheet piles 6 arranged in opposite directions (i.e., interlocked end to end). On the outermost side of the two sheet piles 6 arranged in opposite directions, there is also a positioning stop, which is a positioning strip 59 fixed to the side of the guide channel 3. This positioning stop is mainly used to align the sides of the sheet piles 6 so that when the sheet piles 6 are driven vertically downwards, their sides rest against the flat reference surface of the positioning strip 59, thereby locking the distance between the outer walls of the two sheet piles 6 within the guide channel 3.

[0048] Among them, the guide channel 3 corresponding to a single sheet pile 6 includes an upper channel (entrance end) formed by two sets of aligned guide rollers 56 and guide baffles 57 and a lower channel formed by several lower limiting members 58 located below the upper channel.

[0049] like Figure 6As shown, in this embodiment, the cross-section of the sheet pile 6 is a C-shaped zigzag structure with the opening facing outwards, including a flat section in the middle and inclined sections on both sides of the flat section. The flat section and the inclined section are integrally formed at a certain angle. The angle β between the inclined section and the flat section is an obtuse angle, ranging from greater than 90° to less than 180°. The guide roller 56 rolls in contact with the flat section; the guide block of the lower limiting member 58 slides in contact with both the flat section and the inclined section to achieve three-dimensional limiting.

[0050] like Figure 3 , Figure 5 and Figure 7 As shown, the upper channel mainly consists of four parts: a pair of guide rollers 56 for flexibly clamping and guiding the flat section of the sheet pile 6 on a horizontal plane; roller connecting rods 55 for fixing the guide rollers 56; a vertical frame 510 fixed vertically on the roller connecting rods 55; and a guide baffle 57 mounted in a trumpet shape on the opposite vertical frame 510. The guide rollers 56 have a steel core covered with a high-wear-resistant rubber pad, and their two ends have pivots that engage with the roller connecting rods 55, primarily contacting the flat section of the sheet pile 6. The base of the roller connecting rods 55 is fixed to the support frame 51 by fixing blocks 54 and bolts 53.

[0051] Each idler roller link 55 includes a set of aligned long idler roller links and short idler roller links, which are respectively fixedly connected to the support frame 51 by fixing blocks 54; and the position of the fixing blocks 54 corresponds to the position of the through holes. For adjacent long idler roller links and adjacent short idler roller links, short connecting rods are provided along their width distance to improve their suspension stability and installation strength.

[0052] Furthermore, vertical frames 510 are disposed at the end of each of the long and short idler roller links near the guide roller 56, and their heights are the same. Alignment guide baffles 57, both inclined towards the guide roller 56, are provided between the opposing vertical frames 510 to guide the sheet pile 6 into the upper channel. The two alignment guide baffles 57 are inclined outwards at an angle, with surfaces that open in an inverted trumpet or funnel shape. The downward inclination angle θ of the guide baffles 57 is greater than or equal to 20° and less than or equal to 45°. Figure 7 When the large hoisting crane lowers the steel sheet pile 6, even if there is a slight swaying or swinging in the air, the inclined guide baffle 57 can guide and dissipate the impact force, and use the gravity self-resetting effect to accurately and smoothly push the bottom end of the steel sheet pile 6 towards the center and send it into the clamp of the symmetrical guide rollers 56 on both sides.

[0053] like Figure 3 , Figure 6 , Figure 7As shown, the lower channel is located on the lower inner side of the guide channel 3, and includes a lower limiting member 58 for limiting the verticality deviation of the sheet pile 6. The lower limiting member 58 includes a long lower limiting member for guiding the flat section of the sheet pile 6 and two short lower limiting members for guiding the inclined section of the sheet pile 6. The heads of both the long and short lower limiting members are provided with guide blocks for guidance, and a guide chamfer or guide slope is provided at the upper angle where the guide block contacts the sheet pile 6. The guide block at the head of the long lower limiting member mainly contacts the flat section of the sheet pile 6; the guide block at the head of the short lower limiting member mainly contacts the inclined section of the sheet pile 6.

[0054] For the guiding and positioning device 5 used to guide a single sheet pile 6, the short lower limiting member is arranged on the same side as the short idler roller connecting rod and is located outside the short idler roller connecting rod; and the guide blocks of the short lower limiting member are all arranged facing the inclined section surface of the sheet pile 6 and abut against the inclined section surface of the sheet pile 6. The long lower limiting member is on the same side as the long idler roller connecting rod and is located at the lower middle position of the long idler roller connecting rod. As for the long lower limiting member, since there is only one and it is suspended, a diagonal rib can be provided to connect to the inner side of the support frame 51 ( Figure 3 or Figure 7 To improve the stability and installation strength of its suspension, the lower limiting member 58 can be made of nylon or Teflon wear-resistant limiting block, which creates a sufficiently large difference in lever arm between itself and the top guide roller 56 in vertical height, thereby forming a strong two-point rigid limiting with the sheet pile 6, thoroughly constraining and preventing the sheet pile 6 from deviating vertically when it encounters soft-hard interfacial strata or small boulders.

[0055] In this embodiment, each sheet pile 6 is equipped with two sets of roller connecting rods 55 and two sets of lower limiting members 58. Of the two sets of roller connecting rods 55, two short roller connecting rods are connected to one side of the support frame 51 on the same side, and two long roller connecting rods are connected to the other side of the support frame 51 on the same side. The short lower limiting members are on the same side as the short roller connecting rods and their vertical positions correspond; the long lower limiting members are on the same side as the long roller connecting rods but located in the middle of the two long roller connecting rods, forming a T-shaped structure with the two short lower limiting members. This allows the sheet pile 6 to abut against both sides in the lower channel, ensuring its stable downward movement along the lower channel without deviation.

[0056] For two adjacent sheet piles 6, they are arranged in opposite directions and continuously within the guide channel 3; and the two sets of roller connecting rods 55 and the lower limiting member 58 used for guiding and clamping are arranged in opposite directions, thereby completing the reverse clamping of the two sheet piles 6.

[0057] like Figure 1As shown, the solid line represents the initial installation position of the sheet pile 6, moving in the direction indicated by the black arrow in the diagram. The dashed line represents the next target installation position. During lateral positioning and pile replacement adjustments, first remove bolts 53 and the vibration-damping connection 2. Construction personnel can then manually slide the guide positioning device 5 along the length of the transverse guide rail 42 to the next target installation pile position (dashed line position). Subsequently, bolts 53 are inserted through the fixing plate 52 and precisely screwed into the corresponding adjustment holes on the transverse guide rail 42 and tightened, thereby achieving rigid locking of the guide positioning device 5 on the transverse guide rail 42 and preventing lateral slippage.

[0058] In this embodiment, when the sheet pile 6 is driven to the predetermined depth and its top is lower than the guide positioning device 5, the operator only needs to loosen the corresponding temporary fixing bolt 53 and directly control the guide positioning device 5 to slide horizontally along the transverse track of the main frame 42 without obstruction to the next sheet pile construction hole position. When the top of the pile is higher than the guide positioning device 5, the operator loosens the corresponding temporary fixing bolt 53, lifts the guide positioning device 5, and moves it to the target installation position; thus, it will not be physically blocked or jammed by the already driven sheet pile body, greatly improving the feasibility of continuous and uninterrupted cyclic operation.

[0059] A construction method for a sheet pile driving auxiliary device close to an existing structure, as described above, includes the following steps:

[0060] S1. Based on the design drawings, measure and lay out the lines to accurately mark the construction trajectory of the sheet piles 6. Drill holes at the corresponding height positions of the existing structure 1, and drive in heavy-duty expansion bolts to rigidly lock the connecting beam 21 onto the outer wall of the existing structure 1. Subsequently, the fixed frame 4 is horizontally hoisted into place, and the connecting beam 21 is connected to the transverse guide rail 42 on one side of the fixed frame 4. Vibration damping components are sandwiched between the two connection surfaces. A laser level is used to check and fine-tune the transverse and longitudinal levelness of the upper plane of the fixed frame 4. The levelness of the connecting beam 21 and the transverse guide rail 42 is calibrated by adjusting the adjusting legs 41 at the bottom of the fixed frame 4 to achieve the absolute levelness required by the process, thus completing the establishment of the overall elevation and rigid working benchmark of the device.

[0061] S2. Manually assemble the guide positioning device 5 onto the transverse guide rail 42, and laterally move the guide positioning device 5 to the target construction position. After adjustment and verification by a total station, use bolts 53 to lock and fix the fixing plate 52 on the support frame 51 of the guide positioning device 5, which is used to fix the guide roller 56, to the transverse guide rail 42. At this time, the guide positioning device 5 and the fixed frame 4 are locked and fixed with multi-point, high-strength anti-loosening bolts, forming a reliable planar shear resistance.

[0062] S3. Using a crane, the sheet pile 6 is lifted and guided by the alignment guide baffle 57 above the guide roller 56 into the space between the guide rollers 56, completing the elastic constraint restriction at the top. As the crane continues to slowly lower, the sheet pile 6 continues to descend through the guide channel 3, and the side of the sheet pile 6 is placed against the positioning baffle 59 set on the edge of the support frame 51. The lower limiting member 58 in the guide channel 3 is used to check and fine-tune the verticality of the sheet pile 6 to ensure that the verticality deviation of the sheet pile 6 relative to the vertical gravity line in space meets the requirements.

[0063] S4. Using a pile driver, two sheet piles 6 are driven vertically and smoothly into the soil in sequence. Two sheet piles 6 are used as a group. After one group is driven, the bolts 53 are loosened, the guide positioning device 5 is moved to the next group's construction position, repositioned and locked, and the next group of sheet piles 6 is driven until all sheet piles are driven. During this driving process, the high-frequency impact stress and strong rebound force generated by the friction between the pile driving and the soil are transmitted to the connecting beam 21 through the fixed frame 4. Most of this stress is absorbed by the damping pads 22 through shear deformation, ensuring that the adjacent existing structure 1 is absolutely not threatened by vibration.

[0064] The sheet pile driving auxiliary device designed in this application, which is close to existing structures, has at least the following beneficial effects:

[0065] The buffer isolation design of the vibration damping connection and damping pad effectively blocks the rigid transmission and impact damage of pile driving vibration to the existing structure through the fixed frame and soil, fundamentally avoiding safety hazards such as wall cracking and pier damage.

[0066] The three-dimensional geometric limiting system composed of guide rollers, lower limiting components and positioning stops ensures that the verticality deviation of the steel sheet pile can be controlled within 1‰ and the planar position deviation is less than 10mm, which is significantly better than the traditional process and fully meets the high standard support stress and seepage prevention requirements.

[0067] This auxiliary device integrates guidance, positioning, and vibration reduction. It has a compact structure, and the guiding and positioning device can quickly move along the transverse guide rail and relock, realizing continuous cyclic operation, greatly reducing manual intervention and equipment downtime, resulting in high construction efficiency. The entire device can be reused, and the overall cost is low.

[0068] With height-adjustable outriggers and elongated adjustment holes, it can flexibly adapt to uneven sites and different pile spacing requirements, and is especially suitable for construction in narrow spaces adjacent to existing structures.

[0069] The embodiments of this application have been described in detail above. These descriptions are merely preferred embodiments and should not be construed as limiting the scope of this application. All equivalent variations and modifications made within the scope of this application should still fall within the patent coverage of this application.

Claims

1. An auxiliary device for driving sheet piles close to existing structures, characterized in that, include: A fixed frame includes two transverse guide rails arranged parallel to an existing structure, and a plurality of vibration-damping connection parts for connection between the frame and the existing structure. Vibration-damping components are provided at the connection points between the vibration-damping connection parts and the transverse guide rails. A guiding and positioning device is disposed inside the two transverse guide rails and slides along the transverse guide rails to guide and limit the driving of the steel sheet piles. The guide positioning device has a guide channel extending vertically inside. The entrance end of the guide channel is provided with at least one pair of guide rollers for clamping and guiding the sheet pile into the guide channel. The guide channel is also provided with a positioning stop for limiting the side of the sheet pile.

2. The auxiliary device for driving sheet piles close to existing structures according to claim 1, characterized in that, The vibration damping connection includes a connecting beam that is vertically connected to the existing structure and the transverse guide rail, and the vibration damping component is a damping pad.

3. The auxiliary device for driving sheet piles close to existing structures according to claim 1 or 2, characterized in that, The fixed frame also includes several height-adjustable support legs, and the transverse guide rail is fixed on the support legs; the support legs are used to adjust the levelness, elevation and support stability of the transverse guide rail; Preferably, the side of the transverse guide rail is provided with a plurality of adjustment holes for connecting with the guide positioning device, and the adjustment holes are elongated holes.

4. The auxiliary device for driving sheet piles close to existing structures according to claim 3, characterized in that, The guiding and positioning device also includes a rectangular support frame. Several fixing plates that cooperate with the transverse guide rail are provided on the bottom side of the support frame. Through holes are provided on the fixing plates. After the bolts pass through the through holes and the adjustment holes in sequence, the support frame and the transverse guide rail are locked and fixed.

5. The auxiliary device for driving sheet piles close to existing structures according to claim 4, characterized in that, The support frame is provided with two sets of guide channels for the reverse layout of the sheet piles; the guide channel includes an upper channel formed by two sets of aligning guide rollers and a lower channel formed by several lower limiting members located below the upper channel.

6. The auxiliary device for driving sheet piles close to existing structures according to claim 5, characterized in that, The cross-section of the steel sheet pile has a C-shaped zigzag structure with the opening facing outwards, including a flat section and inclined sections located on both sides of the flat section, and the flat section and the inclined section are integrally formed; the guide roller contacts the flat section; the lower limiting member contacts the flat section and the inclined section.

7. The auxiliary device for driving sheet piles close to existing structures according to claim 6, characterized in that, The upper channel also includes two sets of long roller connecting rods and short roller connecting rods for fixing the guide rollers. The long roller connecting rods and short roller connecting rods are respectively connected to the support frame through fixing blocks; the position of the fixing blocks corresponds to the position of the through holes.

8. The auxiliary device for driving sheet piles close to existing structures according to claim 7, characterized in that, Each of the long idler roller links and the short idler roller links is provided with a vertical frame at one end near the guide idler roller. Between the opposing vertical frames are alignment guide baffles that are inclined toward the guide idler roller to guide the sheet pile into the upper channel.

9. An auxiliary device for driving sheet piles close to existing structures according to claim 7 or 8, characterized in that, The lower channel is located on the lower inner side of the guide channel. The lower limiting member includes a long lower limiting member that contacts the flat section surface and a short lower limiting member that contacts the inclined section surface. The head of the long lower limiting member and the head of the short lower limiting member are both provided with guide blocks for guiding. Preferably, the short lower limiting member is on the same side as the short idler roller connecting rod and is located outside the short idler roller connecting rod; the guide blocks of the short lower limiting member are all arranged facing the inclined section surface. Preferably, the long lower limiting member is on the same side as the long idler roller connecting rod and is located at the lower middle position of the long idler roller connecting rod; Preferably, the positioning stop is a positioning strip fixed to the side of the guide channel, used to align the side of the steel sheet pile.

10. A construction method for an auxiliary device for driving sheet piles close to an existing structure as described in any one of claims 1-9, characterized in that the steps include... include: S1. Measure and lay out the lines according to the design drawings, fix the connecting beam on the existing structure, connect the connecting beam to the transverse guide rail on one side of the fixed frame, and clamp the vibration damping component between the two connection surfaces. Adjust the adjusting legs at the bottom of the fixed frame to calibrate the levelness of the connecting beam and the transverse guide rail. S2. Assemble the guide positioning device onto the transverse guide rail, move the guide positioning device laterally to the target construction position, and lock and fix the fixing plate on the support frame of the guide positioning device used to fix the guide roller to the transverse guide rail with bolts. S3. Hoist the sheet pile, so that the sheet pile enters between the guide rollers under the guidance of the alignment guide baffle above the guide roller, and the side of the sheet pile is attached to the positioning baffle set on the edge of the support frame. The verticality of the sheet pile is checked and fine-tuned by the lower limiting member in the guide channel. S4. Use a pile driver to drive the steel sheet piles vertically and steadily into the soil; take two steel sheet piles as a group, after completing one group of driving, loosen the bolts, move the guide positioning device to the next group of construction positions, reposition and lock it, and continue driving the next group of steel sheet piles until all steel sheet piles are driven.

Images