Liquefied site pile retaining wall structure and construction method thereof

Abstract

The application discloses a liquefied site pile type retaining wall structure and a construction method thereof, which comprises a liquefied site, pile columns and a retaining board, the retaining board is installed between two pile columns, a gap is arranged between the retaining board and the liquefied site, clay fillers are arranged in the gap, a gap water collecting system is arranged at the bottom of the liquefied site, the gap water collecting system comprises water collecting assemblies arranged at the bottom of the liquefied site, a drain pipe arranged close to the bottom of one side of the clay fillers and a water collecting pipe used for connecting the water collecting assemblies and the drain pipe. The gap water at the bottom of the liquefied site is collected by the water collecting assemblies, then is transported into the drain pipe through the water collecting pipe, the water in the shallow layer of the liquefied site flows to the clay fillers slowly due to the gravity, the clay fillers are tamped and are poured with concrete, therefore, the clay fillers are not easy to permeate water, the water flows downward into the drain pipe, finally is discharged from the drain pipe, the gap water in the liquefied site can be uniformly dredged, and the pressure of the retaining board is reduced.

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 pile retaining wall structure for a liquefied site 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;

[0006] A gap is provided between the retaining plate and the liquefaction site, and clay filler is provided in the gap;

[0007] The liquefied site bottom is provided with a interstitial water collection system, the interstitial water collection system includes a water collecting assembly located at the bottom of the liquefied site, a drain pipe located near the bottom of the clay filler side, and a water collecting pipe for connecting the water collecting assembly and the drain pipe, the water collecting pipe is obliquely installed on the key permeable path of the liquefied site, the water collecting assembly is installed between the two water collecting pipes, and the water collecting assembly is a two-section oblique structure.

[0008] The interstitial water at the bottom of the liquefied site is collected by the water collecting assembly, then transported to the drain pipe through the water collecting pipe, and finally discharged by the drain pipe.

[0009] Preferably, the water collecting assembly includes a fixed plate, the fixed plate is fixed by a plurality of galvanized steel pipes at the bottom, a interstitial water collecting box is fixedly installed at the upper end of the fixed plate, a interstitial water collecting surface one is arranged on one side of the interstitial water collecting box, a plurality of through holes are uniformly distributed on the interstitial water collecting surface one, a filter screen one is arranged inside the interstitial water collecting box, and the filter screen one is attached and installed with the inner wall of the interstitial water collecting surface one.

[0010] A filter module one for filtering interstitial water is arranged on the outside of the interstitial water collecting surface one.

[0011] Drainage openings are arranged at the bottom of both ends of the interstitial water collecting box, and the two drainage openings are connected with the water collecting pipes on both sides.

[0012] Preferably, a connecting pipe for connecting the drainage openings is arranged outside the water collecting pipe, and a sealing element for shock absorption is arranged at the opening of the upper end of the connecting pipe.

[0013] The sealing element includes an inner ring, a middle ring and an outer ring, the inner ring is in sealing connection with the drainage opening, the outer ring is in sealing connection with the connecting pipe, and the middle ring is used for connecting the outer ring and the inner ring, and the middle ring is made of rubber material.

[0014] Preferably, a interstitial water collecting surface two is arranged at the upper end of the drain pipe, a plurality of through holes are also uniformly distributed on the interstitial water collecting surface two, a filter screen two is arranged inside the drain pipe, and the filter screen two is attached and installed with the inner wall of the interstitial water collecting surface two.

[0015] A filter module two is arranged on the upper end of the interstitial water collecting surface two.

[0016] 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 integrated reinforced concrete structures, and the upper pile column and the lower pile column are formed by twice concrete pouring.

[0017] Preferably, the lower pile column is located in a pile hole at the lower end of the ground line, a pile body protection wall is arranged on the inner wall of the pile hole, and the lower pile column is poured in the pile body protection wall.

[0018] The pile body wall is a multi-section reinforced concrete structure, and each section of the pile body wall is separately poured and formed from top to bottom.

[0019] Preferably, the bottom and both sides of the pile body wall are provided with lower pile anchors and side pile anchors for improving the stability of the pile column, and the lower pile anchors and side pile anchors are embedded in rocks or rammed soil layers.

[0020] Preferably, the side of the pile column away from the liquefied site is provided with a baffle plate for limiting the retaining plate, the retaining plate is a reinforced concrete prefabricated part, and the retaining plate is arranged on the inner side of the baffle plate between the two pile columns by hoisting.

[0021] Preferably, the top of the pile column and the clay filler is provided with a wall top sealing layer, and the wall top sealing layer is an inclined structure formed by pouring concrete, and the wall top sealing layer is provided with a drainage groove near the side of the liquefied site for draining surface runoff of the liquefied site.

[0022] A construction method of a liquefied site pile retaining wall structure, comprising the following steps:

[0023] S1, construction preparation, clearing the construction site of debris and leveling, and taking safety protection measures;

[0024] S2, excavate the foundation pit, excavate the pile hole and the base groove of the interstitial water collection system according to the drawing, and excavate the pile hole for sectional construction, first excavate the pile hole to a certain depth, then pour and form the inner wall of the pile hole with reinforced concrete, thereby forming a section of the pile body wall, after the first section of the pile body wall is formed, continue to excavate downward, then pour and form the second section of the pile body wall, and in this way, the multi-section pile body wall is completed;

[0025] S3, reinforced concrete pouring of the pile column, installing the pre-prepared reinforcement cage inside the pile body wall of the pile hole, then pouring the concrete, pouring the lower pile column in one time, after the lower pile column is formed, then pouring the upper pile column, binding and connecting the pre-prepared reinforcement cage and the reinforcement at the upper end of the lower pile column, fixing and supporting, then pouring the upper pile column in one time, so that the lower pile column and the upper pile column are integrated into one structure;

[0026] S4, installation of the interstitial water collection system, installing the drainage pipe and the water collecting pipe in the base groove of the interstitial water collection system, fixing the fixed plate in the base groove of the interstitial water collection system through the galvanized steel pipe, fixing the interstitial water collection box on the upper end of the fixed plate, then laying the filter module one on the interstitial water collection surface one, laying the filter module two on the upper end of the interstitial water collection surface two, and then filling and ramming;

[0027] S5, installation of the retaining plate, installing the pre-prepared retaining plate inside the baffle plate between the two pile columns by the automobile crane, then laying the clay filler in the gap between the retaining plate and the liquefied site, and ramming;

[0028] S6, top, concrete is laid on the upper end of the pile and clay filler, and the inclination of the top closure layer of the wall is ensured.

[0029] Compared with the prior art, the present application has the following advantages:

[0030] The present application can speed up the forming speed and quality of the pile, improve the construction efficiency, and improve the stability and bearing capacity of the pile as a whole by pouring the upper pile and the lower pile twice to form an integrated structure. The stability and shear capacity of the pile are further improved by pouring the pile wall first and setting the lower pile anchor and the side pile anchor at the bottom and both sides of the pile wall when excavating the pile hole.

[0031] The multiple sets of water collecting assemblies can collect interstitial water inside the liquefied site, and the collected interstitial water is then transported to the drainage pipe through the water collecting pipe. The water in the shallow layer of the liquefied site will slowly flow to the direction of the clay filler due to gravity. The clay filler is compacted and has concrete poured on it, so it is not easy to seep water, allowing the water to flow downward into the drainage pipe and finally be discharged by the drainage pipe. The interstitial water inside the liquefied site can be uniformly drained, reducing the pressure on the retaining board. BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 is a schematic diagram of the overall structure of the present application Figure One ;

[0033] Figure 2 is a schematic diagram of the overall structure of the present application Figure Two ;

[0034] Figure 3 is an exploded view of the pile retaining board structure of the present application

[0035] Figure 4 is a side view of the pile retaining board structure of the present application

[0036] Figure 5 is a schematic diagram of the water collecting assembly structure of the present application

[0037] Figure 6 is an exploded view of the water collecting assembly structure of the present application

[0038] Figure 7 is a schematic diagram of the water collecting pipe structure of the present application

[0039] Figure 8 is a detailed enlarged view of A in the present application Figure 7

[0040] Figure 9 is a schematic diagram of the drainage pipe and the attached structure of the present application

[0041] Figure 10 ​The exploded view of the drain pipe and the accessory structure of the present application.

[0042] In the figure: 1, liquefied site; 2, pile column; 21, upper pile column; 22, lower pile column; 23, pile body protection 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 assembly; 511, fixed plate; 512, interstitial water collection box; 513, interstitial water collection surface I; 514, filter screen I; 515, filter module I; 516, drainage port; 517, galvanized steel pipe; 52, drain pipe; 521, collection surface II; 522, filter screen II; 523, filter module II; 53, water collection pipe; 531, connecting pipe; 6, sealing element; 61, inner ring; 62, middle ring; 63, outer ring; 7, wall top sealing layer; 8, drainage groove. DETAILED DESCRIPTION

[0043] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0044] Please refer to Figures 1-10 The present application provides a technical solution: a pile type retaining wall structure for liquefied site, comprising a liquefied site 1, a pile column 2 and a retaining board 3, the pile columns 2 are uniformly arranged according to the boundary of the liquefied site 1, 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 integral reinforced concrete structure, and the upper pile column 21 and the lower pile column 22 are formed by twice concrete pouring, the lower pile column 22 is located in a pile hole at the lower end of the ground line, and the inner wall of the pile hole is provided with a pile body protection wall 23, the lower pile column 22 is poured inside the pile body protection wall 23, the pile body protection wall 23 is a multi-section reinforced concrete structure, and each section of the pile body protection wall 23 is separately poured and formed from top to bottom, the bottom and both sides of the pile body protection 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 rock or rammed soil layer;

[0045] The retaining board 3 is installed between two pile columns 2, and the side away from the liquefied site 1 of the pile column 2 is provided with a baffle 26 for limiting the retaining board 3, the retaining board 3 is a reinforced concrete prefabricated part, and is arranged on the inner side of the baffle 26 between the two pile columns 2 by hoisting.

[0046] The two pile columns 2 and their attached structures are only taken in the drawings, and the upper pile column 21 and the lower pile column 22 are poured twice to speed up the forming speed and quality of the pile column 2, improve the construction efficiency, and form an integrated structure through the upper pile column 21 and the lower pile column 22 to improve the stability and bearing capacity of the whole pile column 2. The pile body protection wall 23 is poured first when the pile hole is excavated, and the lower pile anchor 24 and the side pile anchor 25 are arranged at the bottom and both sides of the pile body protection wall 23, which further improves the stability and shear capacity of the pile column 2. The baffle 26 arranged at both sides of the pile column 2 is used for installing the retaining board 3, so that the baffle 26 limits the retaining board 3, improves the hoisting efficiency of the retaining board 3, and speeds up the construction progress.

[0047] The bottom of the liquefied site 1 is provided with a interstitial water collection system 5, the interstitial water collection system 5 includes a water collecting assembly 51 located at the bottom of the liquefied site 1, a drain pipe 52 located near the bottom of one side of the clay filler 4, and a water collecting pipe 53 used for connecting the water collecting assembly 51 and the drain pipe 52, the water collecting pipe 53 is installed obliquely on the key permeable path of the liquefied site 1, the water collecting assembly 51 is installed between the two water collecting pipes 53, and the water collecting assembly 51 is a two-section oblique structure;

[0048] The water collecting assembly 51 includes a fixed plate 511 fixed by a plurality of galvanized steel pipes 517 at the bottom, and a interstitial water collection box 512 fixedly installed at the upper end of the fixed plate 511, one side of the interstitial water collection box 512 is provided with an interstitial water collection surface one 513, a plurality of through holes are uniformly distributed on the interstitial water collection surface one 513, a filter screen one 514 is arranged in the interstitial water collection box 512, the filter screen one 514 is attached and installed with the inner wall of the interstitial water collection surface one 513, a filter module one 515 for filtering interstitial water is arranged outside the interstitial water collection surface one 513, and two drain outlets 516 are arranged at the bottom of both ends of the interstitial water collection box 512 and connected with the water collecting pipes 53 on both sides.

[0049] The water collecting pipe 53 is provided with a connecting pipe 531 outside for connecting the drain outlet 516, the connecting pipe 531 is provided with a sealing piece 6 for shock absorption at the opening of the upper end, the sealing piece 6 includes an inner ring 61, a middle ring 62 and an outer ring 63, the inner ring 61 is sealingly connected with the drain outlet 516, the outer ring 63 is sealingly connected with the connecting pipe 531, and the middle ring 62 is used for connecting the outer ring 63 and the inner ring 61, and the middle ring 62 is made of rubber material;

[0050] The drain pipe 52 is provided with an interstitial water collection surface two 521 at the upper end, a plurality of through holes are also uniformly distributed on the interstitial water collection surface two 521, a filter screen two 522 is arranged inside the drain pipe 52, the filter screen two 522 is attached and installed with the inner wall of the interstitial water collection surface two 521, and a filter module two 523 is arranged on the upper end of the interstitial water collection surface two 521;

[0051] 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.

[0052] 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.

[0053] 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.

[0054] A construction method for a pile retaining wall structure in a liquefied site, comprising the following steps:

[0055] S1. Construction preparation: clear debris from the construction site, level it, and take safety precautions;

[0056] S2, excavate the foundation pit, excavate the pile hole and the base trench of the interstitial water collection system 5 according to the drawing, when excavating the pile hole, the construction is segmented, first excavate the pile hole to a certain depth, then pour the reinforced concrete on the inner wall of the pile hole, thereby forming a section of pile wall 23, after the first section of pile wall 23 is formed, continue to excavate downward, then pour and form the second section of pile wall 23, in this way, the multi-section pile wall 23 is completed;

[0057] S3, pouring of reinforced concrete of pile 2, install the pre-made reinforcement cage inside the pile wall 23 of the pile hole, then pour the concrete, so that the lower pile 22 of the pile 2 is poured and formed at one time, after the lower pile 22 is formed, then pour the upper pile 21, bind and fix the pre-made reinforcement cage with the reinforcement at the upper end of the lower pile 22 and support it, then pour and form the upper pile 21 at one time, so that the lower pile 22 and the upper pile 21 are integrated;

[0058] S4, installation of interstitial water collection system 5, install the drain pipe 52 and the water collecting pipe 53 in the base trench of the interstitial water collection system 5, fix the fixed plate 511 in the base trench of the interstitial water collection system 5 through the galvanized steel pipe 517, fix the interstitial water collection box 512 on the upper end of the fixed plate 511, then lay the filter module one 515 on the interstitial water collection surface one 513, lay the filter module two 523 on the upper end of the interstitial water collection surface two 521, then fill and compact the soil;

[0059] S5, installation of soil retaining plate 3, install the pre-made soil retaining plate 3 inside the retaining plate 26 between the two piles 2 through the automobile crane, then lay the clay filler 4 in the gap between the soil retaining plate 3 and the liquefied site 1 and compact it;

[0060] S6, capping, lay the concrete on the upper end of the pile 2 and the clay filler 4 to cap it, and ensure the inclination of the upper end of the wall top sealing layer 7.

[0061] Although embodiments of the present application have been shown and described, it is to be understood that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present application, the scope of which 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); the retaining plate (3) is installed between two piles (2); a gap is provided between the retaining plate (3) and the liquefied site (1), and a clay filler (4) is provided in the gap; 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, wherein 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 and formed separately from top to bottom. 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 1, 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.

6. 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.

7. The pile retaining wall structure for liquefaction sites according to claim 4, 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).

8. The construction method of a pile retaining wall structure for a liquefied site according to claim 7, 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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