Construction method of foundation pit fat groove vibration reduction structure coping with rail transit vibration environment

Abstract

The invention relates to the technical field of vibration reduction structures, and discloses a foundation pit fat groove vibration reduction structure construction method coping with a rail transit vibration environment, which comprises the following construction steps: 1) a vibration reduction box is assembled in a foundation pit fat groove, an inner cavity is formed in the vibration reduction box, and a backfill interval is formed between the vibration reduction box and a secant pile; (2) a grouting pipe and a plurality of supporting pipes are arranged, elastic pieces with multiple sections of bends are arranged in backfill intervals, and the supporting pipes movably penetrate through the elastic pieces; (3) the inner cavity is filled with sand to form a sand layer, slurry is injected synchronously through a grouting pipe, a plurality of slurry strips are formed in the sand layer, the slurry forms slurry in the grouting pipe, and the slurry, the grouting pipe, the slurry strips and the sand layer are combined into a whole; and (4) the backfill intervals are filled with solidified soil to form backfill layers, the backfill layers cover the supporting pipes and the elastic pieces, the elastic pieces are filled and pressed by the backfill layers and are in an elastic deformation state in the backfill layers, and the elastic pieces and the backfill layers are combined into an elastic overall structure.

Description

Technical Field

[0001] This invention patent relates to the technical field of vibration damping structures. Specifically, it relates to a construction method for the vibration damping structure of the foundation pit cushion between the building and the track traffic vibration environment. Background Art

[0002] For the main building in the track traffic vibration environment, it is greatly affected by the vibration of the track traffic. Generally, a vibration damping structure needs to be arranged between the track traffic and the main building.

[0003] In the prior art, generally, vibration damping materials are filled in the underground soil to form a vibration damping structure to reduce the vibration impact of the track traffic on the main building. However, such vibration damping structures often have defects such as complex structures, inconvenient construction, and low construction efficiency. Moreover, the vibration damping effect of the formed vibration damping structure is poor and it is difficult to meet the vibration damping requirements. Summary of the Invention

[0004] The purpose of the present invention is to provide a construction method for the vibration damping structure of the foundation pit cushion in the track traffic vibration environment, aiming to solve the problem of poor vibration damping effect of the vibration damping structure between the track traffic and the main building in the prior art.

[0005] The present invention is realized as follows. The construction method for the vibration damping structure of the foundation pit cushion in the track traffic vibration environment includes the following construction steps:

[0006] 1). Assemble a vibration damping box in the foundation pit cushion. The vibration damping box is arranged longitudinally and has a longitudinally penetrating inner cavity. One side of the vibration damping box abuts against the main building, and the other side of the vibration damping box faces the secant pile on the outer periphery of the foundation pit and forms a backfill interval with the secant pile.

[0007] 2). Lower a longitudinally arranged grouting pipe into the inner cavity. The bottom of the grouting pipe is closed, and there are a plurality of grouting holes on the outer periphery of the grouting pipe. Arrange a plurality of horizontally arranged support pipes in the backfill interval, and the plurality of support pipes are arranged at intervals along the height direction of the backfill interval. One end of the support pipe abuts against the vibration damping box, and the other end of the support pipe abuts against the secant pile.

[0008] An elastic sheet with elastic deformation performance is provided in the backfill interval. The elastic sheet is arranged longitudinally, and the plurality of support pipes respectively pass through the elastic sheet movably. Along the height direction of the backfill interval, the elastic sheet is arranged in multiple sections and is bent.

[0009] 3), Fill the inner cavity with sand to form a sand layer, and the sand layer wraps the grouting pipe; during the process of filling the inner cavity with sand, inject slurry synchronously through the grouting pipe. The slurry overflows into the sand layer through multiple grouting holes, forming multiple curved slurry strips in the sand layer. The slurry forms a paste in the grouting pipe, and the paste, grouting pipe, slurry strips, and sand layer are combined into one entity;

[0010] 4), Fill the backfill interval with solidified soil to form a backfill layer. The backfill layer abuts against the secant pile and the vibration damping box respectively. The backfill layer and the vibration damping box are arranged in an overlapping manner to form a vibration damping structure; the backfill layer covers the support pipe and the elastic sheet. The elastic sheet is pressed by the filling of the backfill layer and is in an elastically deformed state in the backfill layer. The elastic sheet and the backfill layer are combined into an elastic integral structure.

[0011] Further, in the construction step 1), there are multiple inner cavities in the vibration damping box. The multiple inner cavities are arranged at intervals in sequence along the length direction of the vibration damping box. Adjacent vibration damping boxes are separated and independently arranged by partition plates.

[0012] Further, in the construction step 1), the vibration damping box includes multiple layers of vibration damping groups, and there are hollow areas in the vibration damping groups; the multiple layers of vibration damping groups are arranged in sequence along the height direction of the foundation pit side slope. The hollow areas of the multiple layers of vibration damping groups are aligned and communicated up and down to form the inner cavity.

[0013] In the construction step 1), in the foundation pit side slope, each layer of vibration damping group is constructed and assembled from bottom to top in sequence, and adjacent vibration damping groups are connected into one entity by plug-in connection.

[0014] Further, in the construction step 1), the vibration damping group includes multiple vibration damping units. The multiple vibration damping units are arranged in sequence along the length direction of the foundation pit side slope, and there is the hollow area in the vibration damping unit;

[0015] In the construction step 1), during the process of constructing and assembling the vibration damping group, along the length direction of the foundation pit side slope, the ends of the multiple vibration damping units are plugged and connected into one entity in sequence.

[0016] Further, in the construction step 1), one side of the vibration damping box has an inner side facing the building main body, and the inner side is covered with an inner rubber layer made of elastic material. The inner rubber layer presses against the building main body; in the construction step 4), when the backfill interval is filled with the backfill layer, the inner rubber layer is in an elastically compressed deformation state under extrusion.

[0017] Further, in the construction step 1), the other side of the vibration damping box has an outer side facing the secant pile, and the outer side is covered with an outer rubber layer made of an elastic material; in the construction step 4), the outer rubber layer presses against the backfill layer and is in an elastically compressed deformation state under the extrusion of the backfill layer.

[0018] Further, in the construction step 1, the vibration damping box is provided with a bending strip, and the bending strip includes a transverse section and a longitudinal section bent with the transverse section; after the vibration damping box is assembled, the transverse section is inserted into the vibration damping box and extends into the inner cavity, and the longitudinal section extends into the backfill interval and extends downward.

[0019] In the construction step 3), after the sand layer is formed in the inner cavity, the transverse section is wrapped in the sand layer and connected to the vibration damping box as a whole; in the construction step 4), after the backfill layer is formed in the backfill interval, the longitudinal section is wrapped by the backfill layer and connected to the backfill layer as a whole.

[0020] Further, in the construction step 2), the outer periphery of the grouting pipe is covered with an elastic layer, and the grouting holes penetrate through the elastic layer; the elastic layer is provided with a plurality of annular grooves, the annular grooves are arranged around the circumference of the grouting pipe, and the plurality of annular grooves are arranged at intervals along the height direction of the grouting pipe.

[0021] In the construction step 3), after the sand layer is formed in the inner cavity, the sand layer is embedded in the annular groove and presses against the elastic layer to be in an elastically compressed deformation.

[0022] Further, in the construction step 2), the bottom of the elastic sheet is inserted into the bottom of the backfill interval and is fixedly arranged; in the construction step 4), during the process of filling the backfill interval with solidified soil, the top of the elastic sheet presses against the elastic sheet to elastically deform from top to bottom until the backfill layer is formed in the backfill interval, and the backfill layer presses against the elastic sheet to maintain the elastic deformation state of the elastic sheet.

[0023] Further, in the construction step 2), along the height direction of the elastic sheet, a bending position is formed at the bending part of the elastic sheet, and the bending position is arranged horizontally along the width direction of the elastic sheet; the inside of the bending position is hollow, forming a strip-shaped hollow cavity, and the hollow cavity is filled with elastic glue; the bending position is provided with a plurality of overflow holes, and the elastic glue extends to the filling interval through the overflow holes to form an elastic extension strip.

[0024] In the construction step 4), when the elastic sheet is in an elastically deformed state, the bending position is squeezed and compressed deformed.

[0025] Compared with the prior art, the construction method of the foundation pit cushion vibration reduction structure for coping with the rail transit vibration environment provided by the present invention forms an overlapping vibration reduction structure between the rail transit and the building main body by arranging vibration reduction boxes in the foundation pit cushion. The inner cavity of the vibration reduction box is filled with a sand layer, and a backfill layer is filled between the vibration reduction box and the secant pile. In this way, a vibration reduction barrier can be formed to play a role in vibration reduction and noise reduction;

[0026] Secondly, grouting pipes are arranged in the inner cavity. By injecting slurry, a plurality of curved grout strips are formed in the sand layer, making the integrity of the sand layer better. And the multiple grout strips extend in multiple directions in the sand layer, which can achieve vibration reduction and buffering in multiple directions;

[0027] In addition, the elastic sheets are arranged in multiple curved sections in the backfill layer and are in an elastically deformed state, so that the backfill layer and the elastic sheets are combined into an elastic integral structure, which can further play an elastic buffering effect on vibration and greatly improve the vibration reduction effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 is a front view schematic diagram of the foundation pit cushion vibration reduction structure for coping with the rail transit vibration environment provided by the present invention;

[0029] Figure 2 is an assembly combination schematic diagram of the vibration reduction box provided by the present invention;

[0030] Figure 3 is a sectional view schematic diagram of the vibration reduction unit provided by the present invention;

[0031] Figure 4 is a sectional view schematic diagram of the grouting pipe provided by the present invention;

[0032] Figure 5 is a sectional view schematic diagram of the bending position of the elastic sheet provided by the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0033] In order to make the objectives, technical solutions and advantages of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0034] The implementation of the present invention will be described in detail below with specific embodiments.

[0035] In the drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components; in the description of the present invention, it should be understood that if there are terms such as "upper", "lower", "left", "right", etc. indicating the orientation or positional relationship, they are based on the orientation or positional relationship shown in the drawings. This is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the drawings are only for illustrative purposes and cannot be construed as a limitation of this patent. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0036] Referring to Figures 1-5 as shown, it is a preferred embodiment provided by the present invention.

[0037] A construction method for a foundation pit cushion damping structure for coping with the vibration environment of rail transit includes the following construction steps:

[0038] 1), Assemble the damping box 300 in the foundation pit cushion. The damping box 300 is longitudinally arranged, and there is a longitudinally penetrating inner cavity in the damping box 300; one side of the damping box 300 abuts against the building main body 100, and the other side of the damping box 300 faces the secant pile 201 on the outer periphery of the foundation pit and forms a backfill interval with the secant pile 201;

[0039] In actual construction, after the foundation pit is excavated, the building main body 100 is constructed, and a foundation pit cushion is formed between the building main body 100 and the outer periphery of the foundation pit. Since the secant pile 201 is provided on the outer periphery of the foundation pit, in this way, the foundation pit cushion is formed between the secant pile 201 and the building main body 100;

[0040] 2), Lower a longitudinally arranged grouting pipe 301 into the inner cavity. The bottom of the grouting pipe 301 is closed, and there are a plurality of grouting holes 3014 on the outer periphery of the grouting pipe 301; arrange a plurality of horizontally arranged support pipes 401 in the backfill interval, and the plurality of support pipes 401 are arranged at intervals along the height direction of the backfill interval; one end of the support pipe 401 abuts against the damping box 300, and the other end of the support pipe 401 abuts against the secant pile 201;

[0041] An elastic sheet 500 with elastic deformation performance is provided in the backfill interval. The elastic sheet 500 is longitudinally arranged, and the plurality of support pipes 401 respectively pass through the elastic sheet 500 movably. Along the height direction of the backfill interval, the elastic sheet 500 is arranged in multiple sections in a curved shape;

[0042] The arrangement of the support pipe 401 is to support the elastic sheet 500 to be longitudinally arranged in the filling interval, so as to facilitate filling the backfill interval with solidified soil;

[0043] 3), Fill the inner cavity with sand to form a sand layer, and the sand layer wraps the grouting pipe 301; during the process of filling the inner cavity with sand, inject slurry synchronously through the grouting pipe 301, and the slurry overflows into the sand layer through multiple grouting holes 3014 to form multiple curved slurry strips in the sand layer. The slurry forms a paste in the grouting pipe 301, and the paste, the grouting pipe 301, the slurry strips, and the sand layer are combined into one entity;

[0044] 4), Fill the backfill interval with solidified soil to form a backfill layer 400. The backfill layer 400 abuts against the secant pile 201 and the vibration damping box 300 respectively. The backfill layer 400 and the vibration damping box 300 are arranged in an overlapping state to form a vibration damping structure; the backfill layer 400 covers the support pipe 401 and the elastic sheet 500. The elastic sheet 500 is filled and pressed by the backfill layer 400 and is in an elastically deformed state in the backfill layer 400. The elastic sheet 500 and the backfill layer 400 are combined into an elastic integral structure.

[0045] The above-mentioned construction method of the foundation pit cushion vibration damping structure for coping with the rail transit vibration environment arranges the vibration damping box 300 in the foundation pit cushion. The inner cavity of the vibration damping box 300 is filled with a sand layer, and the backfill layer 400 is filled between the vibration damping box 300 and the secant pile 201. In this way, an overlapping vibration damping structure is formed between the rail transit and the building main body 100, forming a vibration damping barrier, which can play a role in vibration damping and noise reduction;

[0046] Secondly, arrange the grouting pipe 301 in the inner cavity. By injecting slurry, multiple curved slurry strips are formed in the sand layer, making the integrity of the sand layer better. And the multiple slurry strips extend in multiple directions in the sand layer, which can achieve vibration damping and buffering in multiple directions;

[0047] In addition, the elastic sheet 500 is arranged in multiple curved sections in the backfill layer 400 and is in an elastically deformed state, so that the backfill layer 400 and the elastic sheet 500 are combined into an elastic integral structure, which can further play an elastic buffering effect on vibration and greatly improve the vibration damping effect.

[0048] In this embodiment, in construction step 1), the vibration damping box 300 has multiple inner cavities as described above. The multiple inner cavities are arranged at intervals in the length direction of the vibration damping box 300, and adjacent vibration damping boxes 300 are separated and independently arranged by partition plates. In this way, multiple sand layers can be formed inside the vibration damping box 300, which can achieve vibration damping effects at multiple positions and multiple layers.

[0049] In this embodiment, in construction step 1), the vibration damping box 300 includes multiple layers of vibration damping groups 302, and the vibration damping group 302 has a hollow area 3032; the multiple layers of vibration damping groups 302 are arranged in sequence in the height direction of the foundation pit cushion, and the hollow areas 3032 of the multiple layers of vibration damping groups 302 are aligned and communicated up and down to form the above-mentioned inner cavity.

[0050] In the construction step 1), in the foundation pit cushion, the vibration damping groups 302 of each layer are constructed and assembled in sequence from bottom to top, and the adjacent vibration damping groups 302 are connected into one body by plugging. The vibration damping box 300 is formed by vertically plugging and assembling a plurality of vibration damping groups 302, which is convenient for disassembly and separation, as well as for assembly and combination, and is convenient for construction.

[0051] In this embodiment, in the construction step 1), the vibration damping group 302 includes a plurality of vibration damping units 303, and the plurality of vibration damping units 303 are arranged in sequence along the length direction of the foundation pit cushion. The above-mentioned hollow area 3032 is provided in the vibration damping unit 303; in the construction step 1), during the process of constructing and assembling the vibration damping group 302, the ends of the plurality of vibration damping units 303 are plugged and connected into one body along the length direction of the foundation pit cushion.

[0052] In actual construction, first, a plurality of vibration damping units 303 are assembled and combined to form a vibration damping group 302, and then a plurality of vibration damping units 303 are assembled and combined on the vibration damping group 302 to form another vibration damping group 302, which are assembled and combined in sequence from bottom to top until the assembly and combination of the entire vibration damping box 300 are completed.

[0053] In this embodiment, in the construction step 1), one side of the vibration damping box 300 has an inner side surface facing the building main body 100, and the inner side surface is covered with an inner rubber layer 701 made of an elastic material, and the inner rubber layer 701 presses against the building main body 100; in the construction step 4), when the backfill layer 400 is filled in the backfill interval, the inner rubber layer 701 is in an elastically compressed deformation state under extrusion.

[0054] In this way, the inner rubber layer 701 can be used to abut against the building main body 100. In subsequent applications, the vibration damping box 300 can also have an elastic buffering function, further playing a role in vibration damping.

[0055] In this embodiment, in the construction step 1), the other side of the vibration damping box 300 has an outer side surface facing the secant pile 201, and the outer side surface is covered with an outer rubber layer 702 made of an elastic material; in the construction step 4), the outer rubber layer 702 presses against the backfill layer 400 and is in an elastically compressed deformation state under the extrusion of the backfill layer 400.

[0056] In this way, when the vibration damping box 300 is in the foundation pit cushion, the inner rubber layer 701 and the outer rubber layer 702 can play an elastic clamping role on the vibration damping box 300 to improve the function of the vibration damping box 300 and further play a role in vibration damping.

[0057] In this embodiment set, in construction step 1, a bending strip 600 is provided on the vibration damping box 300. The bending strip 600 includes a horizontal section and a vertical section bent with respect to the horizontal section. After the vibration damping box 300 is assembled, the horizontal section is inserted into the vibration damping box 300 and extends into the inner cavity, and the vertical section extends into the backfill interval and extends downward.

[0058] In construction step 3), after a sand layer is formed in the inner cavity, the horizontal section is wrapped in the sand layer and connected to the vibration damping box 300 as a whole. In construction step 4), after a backfill layer 400 is formed in the backfill interval, the vertical section is wrapped by the backfill layer 400 and connected to the backfill layer 400 as a whole.

[0059] The bending strip 600 can be a "7"-shaped steel bar and is respectively inserted into the sand layer and the backfill layer 400 to play a role in reinforcement and ensure the stable position of the vibration damping box 300 in the side trench.

[0060] In this embodiment, in construction step 2), an elastic layer 3012 covers the outer periphery of the grouting pipe 301, and the grouting holes 3014 penetrate the elastic layer 3012. A plurality of annular grooves 3013 are provided on the elastic layer 3012. The annular grooves 3013 are arranged along the circumferential direction of the grouting pipe 301, and the plurality of annular grooves 3013 are arranged at intervals along the height direction of the grouting pipe 301. In construction step 3), after a sand layer is formed in the inner cavity, the sand layer is embedded in the annular grooves 3013 and presses against the elastic layer 3012 to be elastically compressed and deformed.

[0061] By arranging the annular grooves 3013, a better combination can be achieved between the sand layer and the elastic layer 3012. Since the elastic layer 3012 has elastic deformation performance, the sand layer has a certain elastic deformation performance, so that the sand layer has a better vibration damping effect.

[0062] In this embodiment, in construction step 2), the bottom of the elastic sheet 500 is inserted into the bottom of the backfill interval and is fixedly arranged. In construction step 4), during the process of filling solidified soil into the backfill interval, the top of the elastic sheet 500 presses against the elastic sheet 500 from top to bottom to elastically deform it until the backfill layer 400 is formed in the backfill interval, and the backfill layer 400 presses against the elastic sheet 500 to maintain the elastic deformation state of the elastic sheet 500.

[0063] By fixedly arranging the bottom of the elastic sheet 500 and pressing against the top of the elastic sheet 500, the elastic sheet 500 can be elastically deformed. At this time, by filling solidified soil to form the backfill layer 400, due to the elastic recovery ability of the elastic sheet 500, the entire backfill layer 400 has elastic performance, so as to achieve a better vibration damping effect and can achieve multi-directional vibration damping.

[0064] In this embodiment, in construction step 2), along the height direction of the elastic sheet 500, a bent position 503 is formed at the bent part of the elastic sheet 500, and the bent position 503 is arranged transversely along the width direction of the elastic sheet 500; the inside of the bent position 503 is arranged in a hollow manner to form a strip-shaped hollow cavity, and the hollow cavity is filled with elastic glue 502; the bent position 503 is provided with a plurality of overflow holes, and the elastic glue 502 extends to the filling interval through the overflow holes to form an elastic extension strip 501; in construction step 4), when the elastic sheet 500 is in an elastically deformed state, the bent position 503 is squeezed and compressed and deformed.

[0065] A hollow cavity is formed in the bent position 503 and filled with elastic glue 502, which greatly improves the elastic deformation ability of the bent position 503. When the top of the elastic sheet 500 presses against the elastic sheet 500, it is beneficial for the elastic sheet 500 to be compressed and bent and deformed at each bent position 503, realizing the precise elastic deformation of the elastic sheet 500.

[0066] In addition, the elastic glue 502 extends into the backfill layer 400 to form an extension strip 501 wrapped by the backfill layer 400. The extension strip 501 is fixed in the backfill layer 400 and has an elastic pulling effect on the backfill layer 400, so that the entire backfill layer 400 has better elastic performance, greatly improving the integrity of the backfill layer 400 and the elastic sheet 500, and greatly improving the damping capacity of the backfill layer 400.

[0067] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present invention shall be included in the protection scope of the present invention.

Claims

1. Construction method of foundation pit cushion vibration reduction structure for coping with rail transit vibration environment, characterized in that, It includes the following construction steps: 1). Assemble the vibration damping box in the foundation pit cushion. The vibration damping box is longitudinally arranged, and there is an inner cavity longitudinally penetrating through it. One side of the vibration damping box abuts against the building main body, and the other side of the vibration damping box faces the secant pile on the outer periphery of the foundation pit and forms a backfill interval with the secant pile. 2). Lower a longitudinally arranged grouting pipe into the inner cavity. The bottom of the grouting pipe is closed, and there are multiple grouting holes on the outer periphery of the grouting pipe. Arrange multiple horizontally arranged support pipes in the backfill interval, and the multiple support pipes are arranged at intervals along the height direction of the backfill interval. One end of the support pipe abuts against the vibration damping box, and the other end of the support pipe abuts against the secant pile. There is an elastic sheet with elastic deformation performance in the backfill interval. The elastic sheet is longitudinally arranged, and the multiple support pipes respectively pass through the elastic sheet movably. Along the height direction of the backfill interval, the elastic sheet is arranged in multiple curved segments. 3). Fill the inner cavity with sand to form a sand layer, and the sand layer wraps the grouting pipe. During the process of filling the inner cavity with sand, inject slurry synchronously through the grouting pipe. The slurry overflows into the sand layer through the multiple grouting holes to form multiple curved grout strips in the sand layer. The slurry forms a paste in the grouting pipe, and the paste, grouting pipe, grout strips and sand layer are combined into one body. 4). Fill the backfill interval with solidified soil to form a backfill layer. The backfill layer respectively abuts against the secant pile and the vibration damping box. The backfill layer and the vibration damping box are arranged in an overlapping manner to form a vibration damping structure. The backfill layer covers the support pipe and the elastic sheet. The elastic sheet is pressed by the filling of the backfill layer and is in an elastic deformation state in the backfill layer. The elastic sheet and the backfill layer are combined into an elastic integral structure.

2. The construction method of the foundation pit cushion vibration reduction structure for coping with the vibration environment of rail transit according to claim 1, characterized in that, In the construction step 1), there are multiple inner cavities in the vibration damping box, and the multiple inner cavities are arranged at intervals in sequence along the length direction of the vibration damping box. Adjacent vibration damping boxes are separately arranged and separated by partition plates.

3. The construction method of the foundation pit cushion vibration reduction structure for coping with the vibration environment of rail transit according to claim 1 or 2, characterized in that, In the construction step 1), the vibration damping box includes multiple layers of vibration damping groups, and there is a hollow area in the vibration damping group. The multiple layers of vibration damping groups are arranged in sequence along the height direction of the foundation pit cushion, and the hollow areas of the multiple layers of vibration damping groups are aligned and communicated up and down to form the inner cavity. In the construction step 1), in the foundation pit cushion, each layer of vibration damping group is constructed and assembled in sequence from bottom to top, and adjacent vibration damping groups are connected into one body by means of plug-in connection.

4. The construction method of the foundation pit cushion vibration reduction structure for coping with the vibration environment of rail transit according to claim 3, characterized in that In the construction step 1), the vibration damping group includes multiple vibration damping units, and the multiple vibration damping units are arranged in sequence along the length direction of the foundation pit cushion. There is the hollow area in the vibration damping unit. In the construction step 1), during the process of constructing and assembling the vibration damping group, the ends of the multiple vibration damping units are sequentially plugged and connected into one body along the length direction of the foundation pit cushion.

5. The construction method of the foundation pit cushion groove vibration reduction structure for coping with the vibration environment of rail transit according to claim 1 or 2, characterized in that, In the construction step 1), one side of the vibration damping box has an inner side facing the building main body, and the inner side is covered with an inner rubber layer made of an elastic material, and the inner rubber layer presses against the building main body; in the construction step 4), when the backfill layer is filled in the backfill interval, the inner rubber layer is squeezed and in an elastically compressed deformation state.

6. The construction method of the foundation pit cushion groove vibration reduction structure for coping with the vibration environment of rail transit according to claim 5, characterized in that, In the construction step 1), the other side of the vibration damping box has an outer side facing the arrangement of the secant piles, and the outer side is covered with an outer rubber layer made of an elastic material; in the construction step 4), the outer rubber layer presses against the backfill layer and is in an elastically compressed deformation state under the extrusion of the backfill layer.

7. The construction method of the foundation pit cushion vibration reduction structure for coping with the vibration environment of rail transit according to claim 1 or 2, characterized in that In the construction step 1, the vibration damping box is provided with a bending strip, and the bending strip includes a transverse section and a longitudinal section bent with the transverse section; after the vibration damping box is assembled, the transverse section is inserted into the vibration damping box and extends into the inner cavity, and the longitudinal section extends into the backfill interval and extends downward. In the construction step 3), after the sand layer is formed in the inner cavity, the transverse section is wrapped in the sand layer and connected to the vibration damping box as a whole; in the construction step 4), after the backfill layer is formed in the backfill interval, the longitudinal section is wrapped by the backfill layer and connected to the backfill layer as a whole.

8. The construction method of the foundation pit cushion vibration reduction structure for coping with the vibration environment of rail transit according to claim 1 or 2, characterized in that, In the construction step 2), the outer periphery of the grouting pipe is covered with an elastic layer, and the grouting holes penetrate the elastic layer; a plurality of annular grooves are provided on the elastic layer, the annular grooves are arranged around the circumference of the grouting pipe, and the plurality of annular grooves are arranged at intervals along the height direction of the grouting pipe. In the construction step 3), after the sand layer is formed in the inner cavity, the sand layer is embedded in the annular groove and presses against the elastic layer to be in an elastically compressed deformation.

9. The construction method of the foundation pit cushion vibration reduction structure for coping with the vibration environment of rail transit according to claim 1 or 2, characterized in that, In the construction step 2), the bottom of the elastic sheet is inserted into the bottom of the backfill interval and is fixedly arranged; in the construction step 4), during the process of filling the cured soil into the backfill interval, the elastic sheet is pressed from top to bottom by the top of the elastic sheet to elastically deform until the backfill layer is formed in the backfill interval, and the backfill layer presses the elastic sheet to maintain the elastic deformation state of the elastic sheet.

10. The construction method of the foundation pit cushion vibration reduction structure for coping with the vibration environment of rail transit according to claim 9, characterized in that, In the construction step 2), along the height direction of the elastic sheet, a bending position is formed at the bending part of the elastic sheet, and the bending position is arranged transversely along the width direction of the elastic sheet; the inside of the bending position is hollow and forms a strip-shaped hollow cavity, and the hollow cavity is filled with elastic glue; a plurality of overflow holes are provided at the bending position, and the elastic glue extends to the filling interval through the overflow holes to form an elastic extension strip. In the construction step 4), when the elastic sheet is in an elastically deformed state, the bending position is squeezed and compressed deformed.

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