Liquefied site pile type retaining wall structure and construction method thereof

Abstract

The invention discloses a liquefaction site pile type retaining wall structure and a construction method thereof.The liquefaction site pile type retaining wall structure comprises a liquefaction site, piles and a soil retaining plate, the soil retaining plate is installed between the two piles, a gap is formed between the soil retaining plate and the liquefaction site, clay filler is arranged in the gap, a gap water collecting system is arranged at the bottom of the liquefaction site, and the clay filler is arranged in the gap water collecting system. The gap water collection system comprises a water collection assembly located at the bottom of the liquefaction site, a drainage pipe close to the bottom of one side of the clay filler and a water collection pipe used for connecting the water collection assembly and the drainage pipe. Gap water at the bottom of the liquefaction site is collected through the multiple water collecting assemblies and then conveyed into the drainage pipe through the water collecting pipe, water in the shallow layer of the liquefaction site can slowly flow to the clay filler due to the gravity effect, concrete is poured into the clay filler after the clay filler is tamped, and therefore water seepage is not prone to occurring, and the water downwards flows into the drainage pipe; the device can uniformly dredge and liquefy interstitial water in the site and reduce the pressure of the soil retaining plate.

Description

Technical Field

[0001] The present invention relates to the technical field of pile retaining walls, and in particular to a liquefaction site pile retaining wall structure and a construction method thereof. Background Art

[0002] A liquefaction site is a site where, under the influence of earthquakes, dynamic loads, or other factors, saturated, loose, fine-grained soils (such as silt and sand) suddenly lose their shear strength due to a sharp increase in pore water pressure and a decrease in effective stress, exhibiting liquid-like flow characteristics. This phenomenon can cause severe damage to engineering structures and is a major geological hazard requiring attention during construction. For example, the Loess Plateau in Northwest China is primarily covered by a thick layer of loess, with a large amount of exposed Q3 and Q2 loess, which are highly structural and relatively loose. The most representative example is the loess plateau. After years of agricultural irrigation, the soil reaches saturation at a certain depth below the surface. Under static and dynamic forces, liquefaction landslides are prone to occur, and landslide initiation is highly sudden. Furthermore, after the landslide loses stability, the soil often exhibits a fluid-like behavior, resulting in high-speed, long-range movement. The accumulation is extensive, and the distance and hazard range far exceed those of similar landslides, which can easily cause significant casualties and property damage. Furthermore, the exposed areas of the Loess Plateau contain a large number of alluvial and flood deposits and landslide accumulations that occurred at different times, and there is also a high risk of uncontrolled landslides. Under rainfall and runoff conditions, uncontrolled landslides are very likely to occur.

[0003] To limit the potential for landslides in liquefied sites, pile retaining walls are typically used to support the terrain. Existing technology involves directly pouring reinforced concrete piles at the boundaries of the liquefied site and then installing retaining walls. However, this type of geological soil is relatively loose, and after rainfall, a large amount of water easily accumulates underground. If the internal water is not promptly drained, the pressure on the retaining wall will increase. In severe cases, the retaining wall may be damaged, leading to a landslide. Summary of the Invention

[0004] The object of the present invention is to provide a liquefied site pile retaining wall structure and a construction method thereof, so as to solve the problems raised in the above-mentioned background technology.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solution: a pile retaining wall structure for a liquefied site, comprising a liquefied site, piles and a retaining plate, wherein the piles are evenly arranged according to the boundary of the liquefied site, and the retaining plate is installed between two piles; A gap is provided between the retaining plate and the liquefaction site, and clay filler is provided in the gap; A gap water collection system is provided at the bottom of the liquefied site, comprising a water collection assembly at the bottom of the liquefied site, a drainage pipe at the bottom of one side close to the clay filler, and a water collection pipe for connecting the water collection assembly and the drainage pipe. The water collection pipes are installed obliquely on the key permeable path of the liquefied site, and the water collection assembly is installed between the two water collection pipes, and the water collection assembly has a two-stage inclined structure. Among them, the interstitial water at the bottom of the liquefaction site is collected by the water collection component, then transported to the drainage pipe through the water collection pipe, and finally discharged from the drainage pipe.

[0006] Preferably, the water collection assembly includes a fixed plate, which is fixed by multiple galvanized steel pipes at the bottom. A gap water collection box is fixedly installed on the upper end of the fixed plate. A gap water collection surface 1 is provided on one side of the gap water collection box. A plurality of through holes are evenly distributed on the gap water collection surface 1. A filter screen 1 is provided inside the gap water collection box, and the filter screen 1 is installed in contact with the inner wall of the gap water collection surface 1. A filtering module 1 for filtering the interstitial water is laid on the outer side of the interstitial water collecting surface 1; Drainage outlets are provided at the bottoms of both ends of the gap water collection box, and the two drainage outlets are respectively connected to the water collecting pipes on both sides.

[0007] Preferably, a connecting pipe for connecting to a drain outlet is provided on the outside of the water collecting pipe, and a sealing member for shockproofing is provided at the opening of the upper end of the connecting pipe; The sealing member includes an inner ring, a middle ring and an outer ring. The inner ring is sealed with the drain outlet, the outer ring is sealed with the connecting pipe, and the middle ring is used to connect the outer ring and the inner ring, and the middle ring is made of rubber material.

[0008] Preferably, a second gap water collecting surface is provided at the upper end of the drain pipe, and a plurality of through holes are evenly distributed on the second gap water collecting surface. A second filter is provided inside the drain pipe, and the second filter is fitted to the inner wall of the second gap water collecting surface. A second filter module is provided on the upper end of the second gap water collecting surface.

[0009] Preferably, the pile column includes an upper pile column located at the upper end of the ground line and a lower pile column located at the lower end of the ground line. The upper pile column and the lower pile column are an integrated reinforced concrete structure, and the upper pile column and the lower pile column are formed by pouring concrete twice.

[0010] Preferably, the lower pile column is located in a pile hole at the lower end of the ground line, and a pile body retaining wall is provided on the inner wall of the pile hole, and the lower pile column is cast inside the pile body retaining wall; The pile body retaining wall is a multi-section reinforced concrete structure, and each section of the pile body retaining wall is cast individually from top to bottom.

[0011] Preferably, lower pile anchors and side pile anchors for improving the stability of the pile column are provided at the bottom and both sides of the pile body retaining wall, and the lower pile anchors and side pile anchors are embedded in rocks or compacted soil layers.

[0012] Preferably, a baffle for limiting the position of the retaining plate is provided on the side of the pile column away from the liquefaction site. The retaining plate is a prefabricated reinforced concrete part and is installed on the inner side of the baffle between the two pile columns by hoisting.

[0013] Preferably, a wall top sealing layer is laid on the upper ends of the piles and clay fillers, and the wall top sealing layer is an inclined structure made of concrete. A drainage ditch is provided on the side of the wall top sealing layer close to the liquefaction site for discharging surface water from the liquefaction site.

[0014] A construction method for a pile retaining wall structure in a liquefied site, comprising the following steps: S1. Construction preparation: clear debris from the construction site, level it, and take safety precautions; S2. Excavate a foundation pit and excavate the foundation trench for the pile holes and the interstitial water collection system according to the drawings. When excavating the pile holes, a staged construction method is adopted. First, the pile holes are excavated to a certain depth. Then, reinforced concrete is poured on the inner wall of the pile holes to form a section of pile retaining wall. After the first section of the pile retaining wall is formed, continue to excavate downwards and then pour and form the second section of the pile retaining wall. In this way, multiple sections of pile retaining walls are completed. S3, pouring reinforced concrete of the pile column, installing the pre-made steel cage inside the pile body retaining wall of the pile column hole, and then pouring concrete to make the lower pile column of the pile column cast in one time, and then pouring the upper pile column after the lower pile column is formed, and the pre-made steel cage is tied and connected with the steel bars at the upper end of the lower pile column for support, and then the upper pile column is cast in one time so that the lower pile column and the upper pile column are an integrated structure; S4. Install the interstitial water collection system. Install the drainage pipe and water collection pipe in the base trench of the interstitial water collection system. Secure the fixing plate to the base trench of the interstitial water collection system through the galvanized steel pipe. Secure the interstitial water collection box to the upper end of the fixing plate. Then, lay filter module 1 on interstitial water collection surface 1 and filter module 2 on the upper end of interstitial water collection surface 2. Then fill and tamp the soil. S5. Install the retaining wall. Use a truck crane to install the prefabricated retaining wall on the inner side of the retaining wall between the two piles. Then, lay the clay filler in the gap between the retaining wall and the liquefaction site and tamp it. S6. Capping: Lay concrete on the top of the piles and clay fillers to cap the top, and ensure the inclination of the upper end of the wall top sealing layer.

[0015] Compared with the prior art, the present invention has the following beneficial effects: The present invention can accelerate the forming speed and quality of the pile column and improve the construction efficiency by casting the upper pile column and the lower pile column twice. The upper pile column and the lower pile column are cast into an integrated structure twice, which can improve the overall stability and bearing capacity of the pile column. When digging the pile hole, the pile body retaining wall is first cast and the lower pile anchor and the side pile anchor are arranged at the bottom and both sides of the pile body retaining wall, which further improves the stability and shear resistance of the pile column. Multiple sets of water collection components can collect interstitial water inside the liquefied site. After the interstitial water is collected, it is transported to the drain pipe through the water collection pipe. The water in the shallow layer of the liquefied site will slowly flow towards the clay filler due to gravity. The clay filler is compacted and poured with concrete, so it is not easy to seep water, allowing the water to flow downward into the drain pipe and finally be discharged from the drain pipe. It can evenly dredge the interstitial water inside the liquefied site and reduce the pressure on the retaining wall. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 The overall structure of the present invention is shown in FIG. Figure 1 ; Figure 2 The overall structure of the present invention is shown in FIG. Figure 2 ; Figure 3 This is an exploded view of the pile baffle structure of the present invention; Figure 4 A side cross-sectional view of the pile baffle structure of the present invention; Figure 5 It is a schematic structural diagram of the water collection component of the present invention; Figure 6 This is an exploded view of the water collection assembly structure of the present invention; Figure 7 Schematic diagram of the water collecting pipe structure of the present invention; Figure 8 For the present invention Figure 7 Detailed enlarged view of point A in the middle; Figure 9 This is a schematic diagram of the drainage pipe and its accessory structures of the present invention; Figure 10 This is an exploded view of the drainage pipe and its accessory structure of the present invention.

[0017] In the figure: 1. Liquefaction site; 2. Pile; 21. Upper pile; 22. Lower pile; 23. Pile body retaining wall; 24. Lower pile anchor; 25. Side pile anchor; 26. Baffle; 3. Retaining board; 4. Clay filler; 5. Interstitial water collection system; 51. Water collection component; 511. Fixing plate; 512. Interstitial water collection box; 513. Interstitial water collection surface one; 514. Filter one; 515. Filter module one; 516. Drain; 517. Galvanized steel pipe; 52. Drain pipe; 521. Collection surface two; 522. Filter two; 523. Filter module two; 53. Water collection pipe; 531. Connecting pipe; 6. Seal; 61. Inner ring; 62. Middle ring; 63. Outer ring; 7. Wall top sealing layer; 8. Drain trough. DETAILED DESCRIPTION

[0018] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0019] See also Figure 1-10 The present invention provides a technical solution: a liquefied site pile retaining wall structure, comprising a liquefied site 1, pile columns 2 and a retaining plate 3, the pile columns 2 are evenly arranged according to the boundary of the liquefied site 1, the pile columns 2 include an upper pile column 21 located at the upper end of the ground line and a lower pile column 22 located at the lower end of the ground line, the upper pile column 21 and the lower pile column 22 are an integrated reinforced concrete structure, and the upper pile column 21 and the lower pile column 22 are formed by pouring concrete twice, the lower pile column 22 is located in the pile hole at the lower end of the ground line, and the inner wall of the pile hole is provided with a pile body retaining wall 23, the lower pile column 22 is cast inside the pile body retaining wall 23, the pile body retaining wall 23 is a multi-section reinforced concrete structure, and each section of the pile body retaining wall 23 is cast separately from top to bottom, the bottom and both sides of the pile body retaining wall 23 are provided with a lower pile anchor 24 and a side pile anchor 25 for improving the stability of the pile column 2, and the lower pile anchor 24 and the side pile anchor 25 are embedded in the rock or compacted soil layer; The retaining plate 3 is installed between the two piles 2. A baffle 26 for limiting the retaining plate 3 is provided on the side of the pile 2 away from the liquefaction site 1. The retaining plate 3 is a prefabricated reinforced concrete part and is installed inside the baffle 26 between the two piles 2 by hoisting.

[0020] Among them, only two pile columns 2 and their ancillary structures are intercepted in the attached drawings. By casting the upper pile column 21 and the lower pile column 22 twice, the forming speed and quality of the pile column 2 can be accelerated, and the construction efficiency can be improved. By casting the upper pile column 21 and the lower pile column 22 twice into an integrated structure, the overall stability and bearing capacity of the pile column 2 can be improved. When digging the pile column hole, the pile body guard wall 23 is first cast and the lower pile anchor 24 and the side pile anchor 25 are set at the bottom and both sides of the pile body guard wall 23, which further improves the stability and shear resistance of the pile column 2. The baffles 26 set on both sides of the pile column 2 are used to install the retaining plate 3, so that the baffles 26 limit the retaining plate 3, improve the hoisting efficiency of the retaining plate 3, and speed up the construction progress.

[0021] A gap water collection system 5 is provided at the bottom of the liquefied site 1. The gap water collection system 5 includes a water collection component 51 located at the bottom of the liquefied site 1, a drainage pipe 52 at the bottom of one side close to the clay filler 4, and a water collection pipe 53 for connecting the water collection component 51 and the drainage pipe 52. The water collection pipes 53 are installed obliquely on the key permeable path of the liquefied site 1. The water collection component 51 is installed between the two water collection pipes 53, and the water collection component 51 has a two-stage inclined structure. The water collection assembly 51 includes a fixed plate 511, which is fixed by multiple galvanized steel pipes 517 at the bottom. A gap water collection box 512 is fixedly installed on the upper end of the fixed plate 511. A gap water collection surface 513 is provided on one side of the gap water collection box 512. A number of through holes are evenly distributed on the gap water collection surface 513. A filter screen 514 is provided inside the gap water collection box 512. The filter screen 514 is fitted with the inner wall of the gap water collection surface 513. A filter module 515 for filtering gap water is laid on the outside of the gap water collection surface 513. Drains 516 are provided at the bottom of both ends of the gap water collection box 512. The two drains 516 are respectively connected to the water collection pipes 53 on both sides. The water collecting pipe 53 is externally provided with a connecting pipe 531 for connecting to the drain outlet 516. A seal 6 for shockproofing is provided at the upper opening of the connecting pipe 531. The seal 6 comprises an inner ring 61, a middle ring 62, and an outer ring 63. The inner ring 61 is sealed with the drain outlet 516, the outer ring 63 is sealed with the connecting pipe 531, and the middle ring 62 is used to connect the outer ring 63 and the inner ring 61. The middle ring 62 is made of rubber. A second water collection surface 521 is provided at the upper end of the drain pipe 52. A plurality of through holes are evenly distributed on the second water collection surface 521. A second filter screen 522 is provided inside the drain pipe 52. The second filter screen 522 is fitted to the inner wall of the second water collection surface 521. A second filter module 523 is provided on the upper end of the second water collection surface 521. A gap is provided between the retaining wall 3 and the liquefaction site 1, and a clay filler 4 is provided in the gap. A wall top sealing layer 7 is laid on the upper ends of the piles 2 and the clay filler 4, and the wall top sealing layer 7 is an inclined structure made of concrete. A drainage ditch 8 for draining surface water from the liquefaction site 1 is provided on the side of the wall top sealing layer 7 close to the liquefaction site 1.

[0022] Among them, since the soil of the liquefied site 1 is relatively loose, a large amount of water is likely to accumulate inside the liquefied site 1 after rainfall. If the internal water is not discharged in time, the pressure on the retaining plate 3 will increase. In severe cases, the retaining plate 3 may be damaged, resulting in a landslide. The present application collects the interstitial water at the bottom of the liquefied site 1 through the water collecting component 51, and then transports it to the drain pipe 52 through the water collecting pipe 53, and finally discharges it from the drain pipe 52, thereby achieving drainage; further, the interstitial water inside the liquefied site 1 is filtered through the filter module 515 and then flows from the interstitial water collecting surface 513 into the water collecting box interstitial water collecting box 512, and then filtered through the filter screen 514, so that the interstitial water enters the interior of the interstitial water collecting box 512. The two ends of the interstitial water collecting box 512 are inclined structures, which can reduce The impact force of the soil on the interstitial water collection box 512 causes the interstitial water to flow from the inside of the interstitial water collection box 512 to both ends, and then enters the water collection pipe 53 through the two drain ports 516 at the bottom of the interstitial water collection box 512. The water collection pipe 53 is installed at an angle, so that the water collected in the water collection pipe 53 flows downward into the drain pipe 52. When the liquefied site 1 vibrates, the drain port 516 and the drain pipe 52 will shake relative to each other, causing the drain port 516 and the connecting pipe 531 on the drain pipe 52 to collide and squeeze with each other, which is likely to cause the pipe to break and be damaged. Therefore, by providing a sealing member 6, the middle ring 62 on the sealing member 6 is made of rubber and has greater elasticity, which can reduce the probability of pipe breakage. By providing multiple groups of water collection components 51, the interstitial water inside the liquefied site 1 can be evenly dredged, reducing the pressure on the retaining plate 3. In addition, the flowing water on the surface of the liquefied site 1 will flow into the drainage ditch 8 on the soil surface. The water in the shallow layer of the liquefied site 1 will slowly flow toward the clay filler 4 due to gravity. The clay filler 4 is compacted and poured with concrete, so it is not easy to seep water, so that the water flows downward through the filter module 2 523, the interstitial water collection surface 2 521 and the filter screen 2 522 to the drain pipe 52 and be discharged. The filter module 1 515 and the filter module 2 523 are composed of fine sand and gravel layers, which can perform graded filtration of interstitial water.

[0023] A construction method for a pile retaining wall structure in a liquefied site, comprising the following steps: S1. Construction preparation: clear debris from the construction site, level it, and take safety precautions; S2, excavation foundation pit, excavation pile hole and the foundation trench of gap water collection system 5 according to the drawings, when excavating pile hole, for segmented construction, first excavate a certain depth of pile hole, then the inner wall of the pile hole is reinforced concrete poured, thereby forming a section of pile body retaining wall 23, after the first section of pile body retaining wall 23 is formed, continue to dig downwards, then carry out the pouring molding of the second section of pile body retaining wall 23, complete multi-section pile body retaining wall 23 in this way; S3, pouring reinforced concrete of pile column 2, installing the pre-made steel cage inside the pile body retaining wall 23 of the pile hole, and then pouring concrete, so that the lower pile column 22 of pile column 2 is cast and formed at one time, and then the upper pile column 21 is poured after the lower pile column 22 is formed, and the pre-made steel cage is tied and fixed with the steel bars at the upper end of the lower pile column 22 and supported, and then the upper pile column 21 is cast and formed once, so that the lower pile column 22 and the upper pile column 21 are an integrated structure; S4. Install the interstitial water collection system 5. Install the drainage pipe 52 and the water collection pipe 53 in the base trench of the interstitial water collection system 5. Secure the fixing plate 511 to the base trench of the interstitial water collection system 5 via the galvanized steel pipe 517. Secure the interstitial water collection box 512 to the upper end of the fixing plate 511. Then, lay the filter module 1 515 on the interstitial water collection surface 1 513. Lay the filter module 2 523 on the upper end of the interstitial water collection surface 2 521. Then fill and tamp the soil. S5, installation of retaining plate 3: Use a car crane to install the prefabricated retaining plate 3 on the inner side of the retaining plate 26 between the two piles 2, then lay the clay filler 4 in the gap between the retaining plate 3 and the liquefaction site 1 and tamp it; S6, capping, laying concrete on the piles 2 and the upper ends of the clay filler 4 to cap the top, and ensuring the inclination of the upper end of the wall top sealing layer 7.

[0024] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A liquefied site pile retaining wall structure, comprising a liquefied site (1), piles (2) and retaining plates (3), characterized in that: The piles (2) are evenly arranged according to the boundary of the liquefied site (1), and the retaining plate (3) is installed between two piles (2); A gap is provided between the retaining plate (3) and the liquefaction site (1), and a clay filler (4) is provided in the gap; A gap water collection system (5) is provided at the bottom of the liquefied site (1), the gap water collection system (5) comprising a water collection component (51) located at the bottom of the liquefied site (1), a drainage pipe (52) at the bottom of one side close to the clay filler (4), and a water collection pipe (53) for connecting the water collection component (51) and the drainage pipe (52), the water collection pipe (53) being installed obliquely on a key permeable path of the liquefied site (1), the water collection component (51) being installed between the two water collection pipes (53), and the water collection component (51) being a two-stage inclined structure; The interstitial water at the bottom of the liquefied site (1) is collected by the water collecting assembly (51), then transported to the drainage pipe (52) through the water collecting pipe (53), and finally discharged from the drainage pipe (52).

2. The pile retaining wall structure for a liquefied site according to claim 1, characterized in that: The water collecting assembly (51) includes a fixing plate (511), the fixing plate (511) is fixed by a plurality of galvanized steel pipes (517) at the bottom, a gap water collecting box (512) is fixedly installed on the upper end of the fixing plate (511), a gap water collecting surface (513) is provided on one side of the gap water collecting box (512), a plurality of through holes are evenly distributed on the gap water collecting surface (513), a filter (514) is provided inside the gap water collecting box (512), and the filter (514) is fitted with the inner wall of the gap water collecting surface (513); A filtering module (515) for filtering the interstitial water is laid on the outside of the interstitial water collecting surface (513); Drainage outlets (516) are provided at the bottoms of both ends of the interstitial water collection box (512), and the two drainage outlets (516) are respectively connected to the water collecting pipes (53) on both sides.

3. The pile retaining wall structure for liquefaction sites according to claim 2, characterized in that: A connecting pipe (531) for connecting to the drain outlet (516) is provided on the outside of the water collecting pipe (53), and a sealing member (6) for shockproofing is provided at the upper opening of the connecting pipe (531); The sealing member (6) comprises an inner ring (61), a middle ring (62) and an outer ring (63); the inner ring (61) is sealedly connected to the drain port (516); the outer ring (63) is sealedly connected to the connecting pipe (531); the middle ring (62) is used to connect the outer ring (63) and the inner ring (61); and the middle ring (62) is made of rubber material.

4. The pile retaining wall structure for liquefaction sites according to claim 2, characterized in that: The upper end of the drainage pipe (52) is provided with a second gap water collection surface (521), and a plurality of through holes are evenly distributed on the second gap water collection surface (521). The interior of the drainage pipe (52) is provided with a second filter screen (522), and the second filter screen (522) is fitted with the inner wall of the second gap water collection surface (521); A second filter module (523) is provided on the upper end of the second gap water collection surface (521).

5. The pile retaining wall structure for liquefaction sites according to claim 4, characterized in that: The pile column (2) comprises an upper pile column (21) located at the upper end of the ground line and a lower pile column (22) located at the lower end of the ground line. The upper pile column (21) and the lower pile column (22) are an integrated reinforced concrete structure, and the upper pile column (21) and the lower pile column (22) are formed by pouring concrete twice.

6. The pile retaining wall structure for liquefaction sites according to claim 5, characterized in that: The lower pile column (22) is located in the pile hole at the lower end of the ground line, and the inner wall of the pile hole is provided with a pile body retaining wall (23), and the lower pile column (22) is cast inside the pile body retaining wall (23); The pile body retaining wall (23) is a multi-section reinforced concrete structure, and each section of the pile body retaining wall (23) is cast and formed individually from top to bottom.

7. The pile retaining wall structure for liquefaction sites according to claim 6, characterized in that: The bottom and both sides of the pile body retaining wall (23) are provided with a lower pile anchor (24) and a side pile anchor (25) for improving the stability of the pile column (2); the lower pile anchor (24) and the side pile anchor (25) are embedded in rocks or compacted soil layers.

8. The pile retaining wall structure for liquefaction sites according to claim 1, characterized in that: A baffle (26) for limiting the position of the retaining plate (3) is provided on the side of the pile column (2) away from the liquefaction site (1); the retaining plate (3) is a prefabricated reinforced concrete component and is installed inside the baffle (26) between the two pile columns (2) by hoisting.

9. The pile retaining wall structure for liquefaction sites according to claim 6, characterized in that: A wall top sealing layer (7) is laid on the upper ends of the piles (2) and the clay filler (4), and the wall top sealing layer (7) is an inclined structure cast in concrete. A drainage trough (8) for draining surface water from the liquefied site (1) is provided on the side of the wall top sealing layer (7) close to the liquefied site (1).

10. The construction method of a pile retaining wall structure for a liquefied site according to claim 9, characterized in that: The following steps are involved: S1. Construction preparation: clear debris from the construction site, level it, and take safety precautions; S2, excavating a foundation pit, excavating the foundation trench of the pile column hole and the interstitial water collection system (5) according to the drawings, and when excavating the pile column hole, performing segmented construction, first excavating the pile column hole to a certain depth, and then pouring reinforced concrete on the inner wall of the pile column hole to form a section of the pile body retaining wall (23), and continuing to excavate downward after the first section of the pile body retaining wall (23) is formed, and then pouring and forming the second section of the pile body retaining wall (23), thereby completing multiple sections of the pile body retaining wall (23); S3, pouring reinforced concrete of the pile column (2), installing the pre-made steel cage inside the pile body wall (23) of the pile column hole, and then pouring concrete, so that the lower pile column (22) of the pile column (2) is cast and formed at one time, and then the upper pile column (21) is cast after the lower pile column (22) is formed, and the pre-made steel cage is tied and connected with the steel bars at the upper end of the lower pile column (22) and supported, and then the upper pile column (21) is cast and formed at one time, so that the lower pile column (22) and the upper pile column (21) are an integrated structure; S4, installing the gap water collection system (5), installing the drainage pipe (52) and the water collection pipe (53) in the base groove of the gap water collection system (5), fixing the fixing plate (511) in the base groove of the gap water collection system (5) through the galvanized steel pipe (517), fixing the gap water collection box (512) on the upper end of the fixing plate (511), and then laying the filter module 1 (515) on the gap water collection surface 1 (513), laying the filter module 2 (523) on the upper end of the gap water collection surface 2 (521), and then filling and tamping; S5, installation of the retaining plate (3), installing the prefabricated retaining plate (3) between the two piles (2) by using a car crane, and then laying the clay filler (4) in the gap between the retaining plate (3) and the liquefied site (1), and compacting it; S6. Capping: concrete is laid on the top of the piles (2) and the clay filler (4) to cap the top, and the inclination of the top of the wall top sealing layer (7) is ensured.

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