A subway station cover-excavation top-down construction structure and a construction method

Abstract

The application relates to the technical field of underground building structures, in particular to a subway station cover-excavation reverse construction structure and a construction method, which comprises a foundation pit, wherein the top of the foundation pit is provided with a cover plate, the left and right sides of the cover plate are respectively provided with a plurality of bracing piles which are uniformly distributed along the front and back directions, the lower end of each bracing pile is provided with a concave groove, each concave groove is provided with a second spherical body, the middle part of the cover plate is provided with a plurality of centering piles, the lower end of each centering pile is provided with a first spherical body, when earthquake activities occur, the impact in different directions is transmitted to the base, meanwhile, the damping mechanism buffers the base to reduce further shaking of the base, when the bottom soil layer is settled, the second spherical body rolls on the arc-shaped slide under the action of the base and the second spherical body, so that the second spherical body is still in a horizontal position, the station main body is prevented from being inclined, and the application has a wide application prospect in the technical field of underground building structures.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of underground building structure, and particularly relates to a subway station cover-dig top-down structure and a construction method. BACKGROUND

[0002] The selection of the construction method of the subway station not only needs to meet the use function of the subway engineering itself, but also needs to meet the requirements of reasonable development and utilization of effective space on the ground and underground, and needs to consider the adverse effects on the surrounding environment caused by the construction. Whether the selection of the construction method is reasonable has a great influence on the line depth, station structure type, construction period and civil engineering cost, and directly affects the social, economic and environmental benefits of the whole line. When a double-layer subway station is constructed, a cover-dig top-down method is mainly used for construction. The main advantages of the cover-dig top-down method are safety, less land occupation, less interference to residents' life, and even no traffic influence by taking reasonable measures. The cover-dig top-down method is suitable for underground engineering in soft soil areas, complex shapes, large planes and large depths.

[0003] The current cover-dig top-down structure of the double-layer subway station has the following defects: no anti-seismic function, in the areas with strong earthquake activity and serious earthquake disasters, the structure design of the subway station needs to consider the anti-seismic effect. When the earthquake activity occurs, the impact will seriously damage the structure of the underground building, and cause collapse. Most of the current pile foundation reinforcement schemes can only withstand part of the impact in the vertical direction. When the earthquake occurs, the shock wave comes from multiple directions, and the anti-seismic effect is poor. In addition, in the use process of the subway station, the soil under the subway station will settle after a long time of use, which will cause the bottom of the subway station to tilt and bring serious risks to the overall structure of the subway station, and accidents are easy to occur. Therefore, there is an urgent need for a subway station cover-dig top-down structure and a construction method to solve the problems of poor anti-seismic effect of the current subway station cover-dig top-down structure and tilting caused by settlement. SUMMARY

[0004] In order to solve the problems that most of the current pile foundation reinforcement schemes for the cover-dig top-down structure of the subway station can only withstand part of the impact in the vertical direction, and when the earthquake occurs, the shock wave comes from multiple directions, and the anti-seismic effect is poor, and in the use process of the subway station, the soil under the subway station will settle after a long time of use, which will cause the bottom of the subway station to tilt and bring serious risks to the overall structure of the subway station, and accidents are easy to occur, and most of the current pile foundation reinforcement schemes can only withstand part of the impact in the vertical direction, and when the earthquake occurs, the shock wave comes from multiple directions, and the anti-seismic effect is poor, and in the use process of the subway station, the soil under the subway station will settle after a long time of use, which will cause the bottom of the subway station to tilt and bring serious risks to the overall structure of the subway station, and accidents are easy to occur, the present application provides a subway station cover-dig top-down structure and a construction method.

[0005] The technical scheme of the present application is as follows: a foundation pit is provided with a cover plate at the top, a plurality of bracing piles are arranged on the left and right sides of the cover plate and are uniformly distributed along the front-back direction, a concave groove is arranged at the lower end of each bracing pile, a second spherical body is arranged in each concave groove, a plurality of centering piles are arranged in the middle of the cover plate, a first spherical body is arranged at the lower end of each centering pile, a base is arranged at the lower end of each first spherical body, a fixing groove is formed at the upper end of each base, a plurality of damping mechanisms are arranged in the fixing groove and are distributed along the circumference of the centering pile, a protective bottom plate is arranged below the bracing piles, a plurality of arc-shaped slides are arranged on the protective bottom plate and are uniformly distributed along the front-back direction, the second spherical body can slide in the arc-shaped slide on the corresponding side, a protective side plate is arranged on the left and right sides of the foundation pit, and a plurality of buffer mechanisms are arranged between the protective side plate and the bracing pile on the corresponding side.

[0006] Preferably, a construction passage is arranged on one side of the foundation pit, negative one side plates are arranged on the left and right sides of the lower end of the cover plate, the bracing piles are arranged inside the negative one side plates on the corresponding sides, a negative one floor is arranged in the middle of the centering piles, a negative two floor is arranged at the bottom of the centering piles, and negative two side plates are arranged on the left and right sides of the negative two floor.

[0007] Preferably, the lower end of the centering pile is provided with an upwardly-open upper concave groove, the upper end of the base is provided with a lower concave groove, and the first spherical body is located between the corresponding upper concave groove and lower concave groove.

[0008] Preferably, the damping mechanism comprises a fixing block, a sliding groove, a sliding block, a damping compression spring, and a support rod, the fixing groove is provided with a fixing block, the fixing block is provided with a sliding groove, the sliding groove is provided with a sliding block which can slide in the sliding groove, one end of the sliding block is provided with a damping compression spring, the upper end of the sliding block is provided with a support rod, and the upper end of the support rod is hingedly connected with the centering pile.

[0009] Preferably, the buffer mechanism comprises a scissor frame and a buffer column, a plurality of scissor frames are arranged between the protective side plate and the bracing pile on the corresponding side, and a plurality of buffer columns are arranged at the front and back ends of each scissor frame.

[0010] Preferably, the buffer column comprises a fixing column, a fixing cylinder, and a buffer compression spring, the protective side plate is provided with a fixing column, the bracing pile is provided with a fixing cylinder corresponding to the fixing column, each fixing column can be inserted into the corresponding fixing cylinder and can slide in the fixing cylinder, each fixing column is sleeved with a buffer compression spring, and the other end of each buffer compression spring is fixedly connected with the fixing column.

[0011] A construction method of a subway station cover-digging reverse construction structure comprises the following construction steps:

[0012] S1: digging a pit on the ground;

[0013] S2: digging a plurality of support pile holes on the left and right sides of the pit to the design depth, and placing a steel reinforcement cage into the support pile hole and pouring to form a support pile;

[0014] S3: digging a central pile hole to the design depth, and sequentially placing a central column and a steel reinforcement cage into the central pile hole, and pouring to form a central pile;

[0015] S4: excavating the foundation in sections in the pit to the design depth, binding steel reinforcement at the bottom of the foundation, and pouring concrete to form a cover plate;

[0016] S5: backfilling the soil above the cover plate, paving the road, and restoring road traffic, and excavating a construction channel;

[0017] S6: excavating the interior space of the negative first floor in sections, and sequentially binding steel reinforcement and pouring to form a negative first floor slab, and sequentially binding steel reinforcement and pouring to form a negative first floor side plate;

[0018] S7: excavating the interior space of the negative second floor in sections to the design depth, and setting a base, a first spherical body, and a damping mechanism at the bottom of the negative second floor interior space and connecting them with the corresponding central column;

[0019] S8: pouring the protective bottom plate in sections, and setting a second spherical body to sequentially connect with the corresponding support pile on the side;

[0020] S9: pouring the protective side plate in sections and setting a buffer mechanism to connect with the support pile.

[0021] The technical scheme of the present application can achieve the following beneficial effects: (1) the base, the second spherical body, the damping mechanism are set, the central pile is supported by the base, when seismic activity occurs, the impact in different directions is transmitted to the base, when the base shakes, the second spherical body rolls relative to the base, and the damping mechanism buffers the base to reduce further shaking of the base; (2) the protective bottom plate is set, when the bottom soil layer settles, the protective bottom plate tilts, under the action of the base and the second spherical body, the second spherical body rolls on the arc-shaped slide to remain in a horizontal position, ensuring that the main body of the station does not tilt; (3) the buffer mechanism is set, which reduces the impact on the support pile in the horizontal direction, further improving the seismic performance of the main body of the subway station; the technical scheme of the present application has a wide application prospect in the field of underground building structure technology. BRIEF DESCRIPTION OF DRAWINGS

[0022] Figure 1 isometric view of the present application.

[0023] Figure 2 It is the cross-sectional view of the subway station main structure of the present application.

[0024] Figure 3 It is the cross-sectional view of the neutral pile of the present application.

[0025] Figure 4 It is the right view of the full cross-sectional view of the present application.

[0026] Figure 5 It is the front view of the full cross-sectional view of the present application.

[0027] Figure 6 It is the enlarged view of B in the present application. Figure 5

[0028] Figure 7 It is the enlarged view of A in the present application. Figure 2

[0029] Figure 8 It is the enlarged view of the neutral column of the present application.

[0030] Figure 9 It is the cross-sectional view of the foundation pit of the present application.

[0031] 1, foundation pit, 2, cover plate, 3, support pile, 4, second spherical body, 5, neutral pile, 6, first spherical body, 7, base, 8, fixed groove, 9, protection bottom plate, 10, arc-shaped slide, 11, protection side plate, 12, construction passage, 13, negative one layer side plate, 14, negative one layer floor, 15, negative two layer floor, 16, negative two layer side plate, 17, fixed block, 18, sliding groove, 19, sliding block, 20, damping compression spring, 21, support rod, 22, scissor frame, 23, buffer column, 24, fixed column, 25, fixed cylinder, 26, buffer compression spring. DETAILED DESCRIPTION

[0032] The technical solutions of the embodiments of the present application will be described clearly and completely in combination with the drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application. In the description of the present application, it should be noted that the orientations or position relationships indicated by the terms “center”, “upper”, “lower”, “left”, “right”, “vertical”, “horizontal”, “inner”, “outer” and the like are based on the orientations or position relationships shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the devices or elements indicated must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0033] ​​Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0034] like Figures 1-9 The above-described subway station cut-and-cover reverse construction structure includes a foundation pit 1. In one specific embodiment, the top of the foundation pit 1 is set as a cover plate 2, and several retaining piles 3 are fixedly installed on the left and right sides of the cover plate 2, which are evenly distributed in the front-to-back direction.

[0035] In the above embodiment, the foundation pit 1 includes an internal recessed pit excavated during the entire construction process for building the main structure of the subway station. The top of the pit is formed by pouring concrete to form a cover plate 2. The upper end of the cover plate 2 is set as the road surface layer, that is, the top layer of the main structure of the subway station. Multiple retaining piles 3 are fixedly installed on the left and right sides of the cover plate 2 and are evenly distributed in the front and back direction. The retaining piles 3 are all set in the vertical direction. The retaining piles 3 play a supporting role for the entire subway station.

[0036] like Figures 1-9 The above-described subway station cut-and-cover reverse construction structure has one specific embodiment in which a concave groove is provided at the lower end of each retaining pile 3, and a second spherical body 4 is embedded and connected in each concave groove, and the second spherical body 4 can roll in the concave groove.

[0037] like Figures 1-9 The above-described cut-and-cover reverse construction structure for a subway station includes a specific embodiment where a number of central piles 5 are fixedly connected to the center of the cover plate 2. The central piles 5 are evenly distributed in a front-to-back direction, and each central pile 5 is configured in a vertical direction. The lower end of each central pile 5 is in contact with a first spherical body 6, and the lower end of each first spherical body 6 is in contact with a base 7. Specifically, the lower end of the central pile 5 has an upper groove with an opening facing downwards, and the upper end of the base 7 has a lower groove. The first spherical body 6 is located between its corresponding upper and lower grooves. During seismic activity, impacts from different directions are transmitted to the base 7. When the base 7 shakes, a second spherical body 4 will roll relative to the base 7, keeping the central pile 5 in a vertical state. At this time, the second spherical body 4 is located in the lower groove, and the base 7 still provides support for the second spherical body 4. This structure helps to reduce seismic impacts to a certain extent and can withstand impacts from various directions.

[0038] likeFigures 1-9 The subway station cover excavation reverse construction structure shown in the embodiment, the upper end of each base 7 is provided with a fixed groove 8, the fixed groove 8 is provided with a plurality of shock absorbing mechanisms distributed along the circumference of the centering column 5, the shock absorbing mechanism comprises a fixed block 17, a sliding groove 18, a sliding block 19, a shock absorbing spring 20 and a support rod 21, the fixed groove 8 is fixedly connected with the fixed block 17, the fixed block 17 is distributed in the fixed groove 8 along the circumference of the centering column, the fixed block 17 is provided with the sliding groove 18, the sliding groove 18 is slidably connected with the sliding block 19 which can slide in the sliding groove 18, one end of the sliding block 19 is fixedly connected with the shock absorbing spring 20, the upper end of the sliding block 19 is hingedly connected with the support rod 21, the upper end of the support rod 21 is hingedly connected with the centering column 5, when the base 7 shakes, the base 7 drives the connecting rod to swing, at this time, the connecting rod drives the sliding block 19 to slide in the sliding groove 18 and compresses the shock absorbing spring 20, at the same time, due to the hysteresis of the shock absorbing spring 20, the effect of buffering the shaking impact is achieved.

[0039] As shown in the subway station cover excavation reverse construction structure, a specific embodiment is that the bottom of the foundation pit 1 is fixedly poured with a protection bottom plate 9, the protection bottom plate 9 is provided with a plurality of arc-shaped slides 10 distributed along the front and back directions, the second spherical body 4 can slide in the arc-shaped slide 10 on the corresponding side, when the bottom soil layer settles, at this time, the protection bottom plate 9 inclines, under the action of the base 7 and the second spherical body 4, the second spherical body 4 rolls on the arc-shaped slide 10, so that it is still in the horizontal position, ensuring that the station main body does not incline. Figures 1-9

[0040] As shown in the subway station cover excavation reverse construction structure, a specific embodiment is that the bottom of the foundation pit 1 is fixedly poured with a protection bottom plate 9, the protection bottom plate 9 is provided with a plurality of arc-shaped slides 10 distributed along the front and back directions, the second spherical body 4 can slide in the arc-shaped slide 10 on the corresponding side, when the bottom soil layer settles, at this time, the protection bottom plate 9 inclines, under the action of the base 7 and the second spherical body 4, the second spherical body 4 rolls on the arc-shaped slide 10, so that it is still in the horizontal position, ensuring that the station main body does not incline. Figures 1-9 ​The diagram illustrates a cut-and-cover reverse construction structure for a subway station. In one specific embodiment, protective side panels 11 are cast on both sides of the foundation pit 1. Several buffer mechanisms are installed between the protective side panels 11 and their corresponding retaining piles 3. The protective side panels 11 are located outside their respective retaining piles 3, providing protection for both sides of the main subway station structure. The buffer mechanisms include scissor frames 22 and buffer columns 23. Multiple scissor frames 22 are hinged between the protective side panels 11 and their corresponding retaining piles 3. Several buffer columns 23 are fixedly installed at both ends of each scissor frame 22. Each buffer column 23 is fixedly connected to both ends of the protective side panel 11 and the retaining piles 3. The buffer column 23 includes a fixed column 24, a fixed cylinder 25, and a buffer spring 26. The protective side panels 11 are fixed with... The retaining pile 3 is connected to fixed columns 24, and fixed cylinders 25 corresponding to the fixed columns 24 are fixedly connected to them. Each fixed column 24 can be inserted into the fixed cylinder 25 on its corresponding side and can slide within the fixed cylinder 25. The fixed column 24 and the fixed cylinder 25 slide by friction. During the sliding process, the fixed column 24 and the fixed cylinder 25 are buffered and damped by continuous friction. Each fixed column 24 is fitted with a buffer spring 26. One end of the buffer spring 26 is fixedly connected to the protective side plate 11, and the other end of each buffer spring 26 is fixedly connected to the fixed cylinder. The buffer mechanism reduces the impact on the retaining pile 3 in the horizontal direction, and further improves the seismic performance of the subway station. Specifically, when left and right swaying occurs, the protective side plate 11 drives the fixed column 24 to slide within the fixed cylinder 25, thereby reducing the shock.

[0041] like Figures 1-9 The above-described subway station cut-and-cover reverse construction structure has the following specific embodiment: a construction passage 12 is provided on one side of the foundation pit 1 to facilitate the construction process; a first-level basement side plate 13 is fixedly poured on the left and right sides of the lower end of the cover plate 2; retaining piles 3 are located inside the corresponding first-level basement side plate 13; a first-level basement floor 14 is fixedly poured in the middle of the central pile 5; a second-level basement floor 15 is fixedly poured at the bottom of the central pile 5; and second-level basement side plates 16 are fixedly poured on the left and right sides of the second-level basement floor 15.

[0042] A construction method for a cut-and-cover reverse construction structure of a subway station includes the following construction steps:

[0043] S1: Dig a pit in the ground;

[0044] S2: Excavate several retaining pile holes 3 to the design depth on both sides of the pit, and put the steel cage into the retaining pile holes 3 and pour it to form retaining pile 3;

[0045] S3: Excavate five holes for central piles to the designed depth, place the central column and the steel cage into the five holes for central piles in sequence, and pour concrete to form central pile 5.

[0046] S4: segmentally excavating the foundation pit 1 in the pit to the design depth, binding the steel bars at the bottom of the foundation pit 1 and pouring the concrete to form the cover plate 2;

[0047] S5: backfilling the earthwork above the cover plate 2, paving the road and restoring the road traffic, and excavating the construction channel 12;

[0048] S6: segmentally excavating the interior space of the negative first floor, and sequentially binding the steel bars and pouring to form the negative first floor plate 14, and sequentially binding the steel bars and pouring to form the negative first floor side plate 13;

[0049] S7: segmentally excavating the interior space of the negative second floor to the design depth, setting the base 7, the first spherical body 6 and the damping mechanism at the bottom of the interior space of the negative second floor and connecting them with the corresponding central columns;

[0050] S8: segmentally pouring the protective bottom plate 9, and setting the second spherical body 4 to be sequentially connected with the corresponding surrounding piles 3;

[0051] S9: segmentally pouring the protective side plate 11 and setting the buffer mechanism to be connected with the surrounding piles 3.

[0052] The working principle of the device is that when the device is used, different direction impacts will be transmitted to the base 7 when the earthquake activity occurs, so that the base 7 shakes, at this time, the second spherical body 4 and the base 7 will relatively roll, at the same time, when the base 7 shakes, the base 7 drives the connecting rod to swing, at this time, the connecting rod drives the sliding block 19 to slide in the sliding groove 18 and compresses the damping compression spring 20, at the same time, due to the hysteresis of the damping compression spring 20, the effect of buffering the shaking impact is achieved, when left and right shaking occurs, the protective side plate 11 drives the fixed column 24 to slide in the fixed cylinder 25, so that it is buffered, when the bottom soil layer subsides, at this time, the protective bottom plate 9 inclines, under the action of the base 7 and the second spherical body 4, the second spherical body 4 rolls on the arc-shaped slide 10, so that it is still in the horizontal position, ensuring that the main body of the station does not incline.

[0053] The above-described embodiments only express several embodiments of the present application, and the description is more specific and detailed, but it cannot be understood as limiting the scope of the patent. It should be noted that for ordinary skilled persons in the art, without departing from the concept of the present application, a number of modifications and improvements can be made, which belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application should be subject to the appended claims.

Claims

1. A cut-and-cover reverse construction structure for a subway station, comprising a foundation pit (1), characterized in that, The top of the foundation pit (1) is set as a cover plate (2). Several retaining piles (3) are evenly distributed in the front-back direction on the left and right sides of the cover plate (2). Each retaining pile (3) has a concave groove at its lower end. A second spherical body (4) is set in each concave groove. Several central piles (5) are set in the middle of the cover plate (2). A first spherical body (6) is set at the lower end of each central pile (5). A base (7) is set at the lower end of each first spherical body (6). An opening is made at the upper end of each base (7). There is a fixed groove (8), and several shock-absorbing mechanisms are provided in the fixed groove (8) and distributed around the central pile (5). A protective base plate (9) is provided below the retaining pile (3). Several arc-shaped slides (10) are provided on the protective base plate (9) and evenly distributed in the front and back direction. The second spherical body (4) can slide in the arc-shaped slide (10) on its corresponding side. Protective side plates (11) are provided on the left and right sides of the foundation pit (1). Several buffer mechanisms are provided between the protective side plate (11) and the retaining pile (3) on its corresponding side.

2. The cut-and-cover reverse construction structure for a subway station according to claim 1, characterized in that, A construction passage (12) is provided on one side of the foundation pit (1). A first-level negative side plate (13) is provided on the left and right sides of the lower end of the cover plate (2). The retaining piles (3) are located inside the first-level negative side plate (13) on their corresponding sides. A first-level negative floor (14) is provided in the middle of the central pile (5). A second-level negative floor (15) is provided at the bottom of the central pile (5). A second-level negative side plate (16) is provided on the left and right sides of the second-level negative floor (15).

3. The cut-and-cover reverse construction structure for a subway station according to claim 1, characterized in that, The lower end of the neutral pile (5) is provided with an upper groove that opens downwards, and the upper end of the base (7) is provided with a lower groove. The first spherical body (6) is located between its corresponding upper groove and lower groove.

4. The cut-and-cover reverse construction structure for a subway station according to claim 1, characterized in that, The shock absorption mechanism includes a fixed block (17), a sliding groove (18), a sliding block (19), a shock absorption spring (20), and a support rod (21). The fixed groove (8) contains the fixed block (17), the fixed block (17) contains the sliding groove (18), the sliding groove (18) contains the sliding block (19) which can slide within the sliding groove (18), the sliding block (19) has a shock absorption spring (20) at one end, and the upper end of the sliding block (19) has a support rod (21). The upper end of the support rod (21) is hinged to the central pile (5).

5. The cut-and-cover reverse construction structure for a subway station according to claim 1, characterized in that, The buffer mechanism includes scissor frames (22) and buffer columns (23). Multiple scissor frames (22) are provided between the protective side plate (11) and the corresponding side retaining piles (3). Several buffer columns (23) are provided at the front and rear ends of each scissor frame (22).

6. A cut-and-cover reverse construction structure for a subway station according to claim 5, characterized in that, The buffer column (23) includes a fixed column (24), a fixed cylinder (25), and a buffer spring (26). The protective side plate (11) is provided with a fixed column (24), and the retaining pile (3) is provided with a fixed cylinder (25) corresponding to the fixed column (24). Each fixed column (24) can be inserted into the fixed cylinder (25) on its corresponding side and can slide inside the fixed cylinder (25). Each fixed column (24) is fitted with a buffer spring (26), and the other end of each buffer spring (26) is fixedly connected to the fixed cylinder.

7. A construction method for a cut-and-cover reverse construction structure of a subway station according to any one of claims 1-6, characterized in that, The construction steps include the following: S1: Dig a pit in the ground; S2: On the left and right sides of the pit, excavate several retaining pile (3) holes to the design depth, and put the steel cage into the retaining pile (3) holes and pour it to form retaining pile (3). S3: Excavate the central pile (5) hole to the design depth, put the central column and the steel cage into the central pile (5) hole in sequence, and pour it to form the central pile (5). S4: Excavate the foundation pit (1) in sections to the designed depth in the pit, tie steel bars at the bottom of the foundation pit (1) and pour concrete to form a cover plate (2). S5: Backfill the earthwork above the cover plate (2), pave the road and restore road traffic, and excavate the construction passage (12). S6: Excavate the internal space of the first basement level in sections, and tie the steel bars and pour the concrete in sequence to form the first basement level floor (14), and tie the steel bars and pour the concrete in sequence to form the first basement level side plate (13). S7: Excavate the interior space of the second basement level in sections to the design depth, and set the base (7), the first spherical body (6), and the shock absorption mechanism at the bottom of the interior space of the second basement level and connect them with the corresponding central column; S8: Segmented pouring of protective base plate (9), and setting of second spherical body (4) to connect with the retaining pile (3) on its corresponding side in sequence; S9: Segmented pouring of protective side panels (11) and setting of buffer mechanisms to connect them with retaining piles (3).

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