A foundation pit support structure

Abstract

The embodiment of the present application provides a foundation pit support structure, comprising: a plurality of front-row piles, each of which is arranged at intervals around the periphery of the foundation pit, and the front-row piles are arranged in the foundation soil outside the foundation pit; a plurality of rear-row piles, each of which is arranged at intervals around the periphery of the front-row piles, and the rear-row piles are arranged in the foundation soil outside the front-row piles; a connecting structure formed at the top of the front-row piles and the rear-row piles, and fixedly connecting the front-row piles and the rear-row piles. The embodiment of the present application solves the technical problem of the limited applicable environment of the traditional foundation pit support structure.

Description

Technical Field

[0001] The present application relates to the field of construction engineering technology, and in particular, to a foundation pit support structure. Background Art

[0002] In urban rail transit and industrial and civil construction foundation pit projects, deep foundation pit projects constructed using the open-cut method usually use several types of support structures, such as retaining piles + steel supports, retaining piles + anchor cables, and cantilever types. When the foundation pit is long and narrow and deep, it is more reasonable to use the retaining pile + steel support support structure; when the foundation pit is wide, irregularly arranged, and deep, it is more reasonable to use the retaining pile + anchor cable support structure; when the foundation pit is shallow, the surrounding area is relatively open, and the requirements for foundation pit deformation and surface settlement are not high, it is more reasonable to use the cantilever support structure. In the case of a foundation pit with a complex surrounding environment and an irregular, special and deep shape, such as when there are nearby buildings (structures) and dense important pipelines; if a support type support structure is used, there will be problems such as complex support arrangement, unclear force transmission path and high cost; if an anchor pull type support structure is used, it will be affected by surrounding buildings (structures) and pipelines, causing problems such as the inability to set up anchor cables; if a cantilever support structure is used, there will be problems such as a large embedding depth and a large pile diameter, which is not conducive to controlling surface settlement and foundation pit deformation, affecting the safety of the surrounding environment, and high cost. The existing technology will no longer be applicable to the above-mentioned common foundation pit support structure forms when the surrounding environment is complex, the conditions are tight, the foundation pit is strange and irregular in shape, and the requirements for controlling foundation pit deformation and surface settlement are high.

[0003] Therefore, the applicable environment of traditional foundation pit support structures is limited, which is a technical problem that technical personnel in this field urgently need to solve.

[0004] The above information disclosed in the background section is only for enhancing understanding of the background of the present application and therefore it may contain information that does not form the prior art known to a person of ordinary skill in the art. Summary of the invention

[0005] The embodiment of the present application provides a foundation pit support structure to solve the technical problem that the applicable environment of the traditional foundation pit support structure is limited.

[0006] The present application provides a foundation pit support structure, including:

[0007] A plurality of front-row piles, each of which is arranged at intervals around the periphery of the foundation pit, and the front-row piles are arranged in the foundation soil outside the foundation pit;

[0008] A plurality of rear-row piles, each of which is arranged at intervals around the periphery of the front-row piles, and the rear-row piles are arranged in the foundation soil around the front-row piles;

[0009] A connecting structure is formed at the top ends of the front row piles and the rear row piles, and fixedly connects the front row piles and the rear row piles.

[0010] The embodiment of the present application adopts the above technical solution, which has the following technical effects:

[0011] Each front row of piles is arranged in the foundation soil around the foundation pit in an interval manner, and each rear row of piles is arranged in the foundation soil around the front row of piles in an interval manner. The front row of piles and the rear row of piles are fixedly connected as a whole through the connecting structure, so that the force received at any position of the foundation pit support structure can be dispersed to the entire foundation pit support structure, so that the force received by the foundation pit support structure is relatively uniform, which can ensure the safety of underground structure construction and the surrounding environment of the foundation pit. The foundation pit support structure is a structure along the outer shape of the foundation pit. No matter whether the shape of the foundation pit is regular or strange and irregular, it is sufficient to set the foundation pit support structure along the periphery of the foundation pit; at the same time, the width of the foundation pit support structure at any position outside the foundation pit is narrow, and the width can be adaptively adjusted with the surrounding environment of the foundation pit to avoid underground pipelines and other structures, which can be suitable for scenes with more complex environments around the foundation pit. Therefore, the foundation pit support structure of the embodiment of the present application can be applied to foundation pits of any shape, and has a high adaptability to the environment surrounding the foundation pit, that is, it is applicable to a wide range of environments; at the same time, the force is relatively uniform, which can ensure the safety of underground structure construction and the environment surrounding the foundation pit. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] The drawings described herein are used to provide a further understanding of the present application and constitute a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation on the present application. In the drawings:

[0013] Figure 1 A top perspective view of a foundation pit support structure of an embodiment of the present application arranged outside a foundation pit;

[0014] Figure 2 for Figure 1 A partial schematic diagram of the elevation is shown;

[0015] Figure 3 This is a schematic elevation diagram of the foundation pit support structure of Example 2 of the present application;

[0016] Figure 4 This is a top perspective view of the foundation pit support structure of Example 2 of the present application;

[0017] Figure 5 This is a schematic elevation diagram of the foundation pit support structure of Example 3 of the present application;

[0018] Figure 6This is a top perspective view of the foundation pit support structure of Example 3 of the present application;

[0019] Figure 7 It is a schematic elevation diagram of the foundation pit support structure of the fourth embodiment of the present application;

[0020] Figure 8 This is a top perspective view of the foundation pit support structure of Example 4 of the present application.

[0021] Description of reference numerals:

[0022] 110 front piles, 120 rear piles, 130 I-beams,

[0023] 210 front row pile crown beam, 220 rear row pile crown beam, 230 connecting beam, 240 connecting plate,

[0024] 250 transverse bridge beam,

[0025] 10 foundation pits, 20 buildings. DETAILED DESCRIPTION

[0026] In order to make the technical solutions and advantages in the embodiments of the present application more clearly understood, the exemplary embodiments of the present application are further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present application, rather than an exhaustive list of all the embodiments. It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0027] Embodiment 1

[0028] Figure 1 A top perspective view of a foundation pit support structure of an embodiment of the present application arranged outside a foundation pit; Figure 2 for Figure 1 A partial schematic diagram of the elevation is shown.

[0029] like Figure 1 and Figure 2 As shown, the foundation pit support structure of the embodiment of the present application includes:

[0030] A plurality of front-row piles 110, each of which is arranged at intervals around the periphery of the foundation pit 10, and the front-row piles are arranged in the foundation soil outside the foundation pit;

[0031] A plurality of rear-row piles 120, each of the rear-row piles 120 is arranged at intervals around the periphery of the front-row piles 110, and the rear-row piles are arranged in the foundation soil around the front-row piles;

[0032] The connection structure is formed at the top ends of the front row piles and the rear row piles, and fixedly connects the front row piles 110 and the rear row piles 120 .

[0033] In the foundation pit support structure of the embodiment of the present application, each front row of piles is arranged in the foundation soil outside the foundation pit in a spaced manner, and each rear row of piles is arranged in the foundation soil outside the front row of piles in a spaced manner. The front row of piles and the rear row of piles are fixedly connected as a whole through a connecting structure. In this way, the force received at any position of the foundation pit support structure can be dispersed to the entire foundation pit support structure, so that the force received by the foundation pit support structure is relatively uniform, which can ensure the safety of the underground structure construction and the surrounding environment of the foundation pit. The foundation pit support structure is a structure along the outer shape of the foundation pit. No matter whether the shape of the foundation pit is regular or strange and irregular, it is sufficient to set the foundation pit support structure along the periphery of the foundation pit; at the same time, the width of the foundation pit support structure at any position outside the foundation pit is relatively narrow, and the width can be adaptively adjusted with the surrounding environment of the foundation pit to avoid underground pipelines and other structures, which can be suitable for scenes with relatively complex surrounding environments of the foundation pit. Therefore, the foundation pit support structure of the embodiment of the present application can be applied to foundation pits of any shape, and has a high adaptability to the environment surrounding the foundation pit, that is, it is applicable to a wide range of environments; at the same time, the force is relatively uniform, which can ensure the safety of underground structure construction and the environment surrounding the foundation pit.

[0034] In implementation, such as Figure 1 and Figure 2 As shown, the front row piles 110 and the rear row piles 120 are of the same number and are arranged one-to-one.

[0035] The front row piles and the rear row piles that are arranged opposite to each other can transmit the force to the front row piles arranged opposite to the rear row piles through the front row pile crown beams and the rear row pile crown beams when the rear row piles are subjected to a large force applied by the underground structure of the surrounding buildings 20 and the soil between the rear row piles. The rear row piles and the front row piles that are arranged opposite to each other can provide sufficient support at this position, thereby playing a role in protecting the underground structure and foundation pit of the surrounding buildings.

[0036] In implementation, the spacing between the front row piles is greater than or equal to 1.5 times the diameter of the front row piles and less than or equal to twice the diameter of the front row piles;

[0037] The distance between the front row piles and the rear row piles is greater than or equal to twice the diameter of the front row piles and less than or equal to four times the diameter of the front row piles;

[0038] Wherein, the diameter of the front row of piles is equal to the diameter of the rear row of piles.

[0039] The spacing between the front row piles and the spacing between the rear row piles are equal, and the spacing is small, so that the arrangement density is large in the area along the periphery of the foundation pit, so that the structural rigidity and strength of the foundation pit support structure are large. The spacing between the front row piles and the rear row piles cannot be too small, otherwise it is easy to cause the collapse of the foundation soil between the two; the spacing between the front row piles and the rear row piles cannot be too large, otherwise it may cause insufficient rigidity and strength of the foundation pit support structure. Therefore, the spacing between the front row piles and the rear row piles is greater than or equal to twice the diameter of the front row piles and less than or equal to four times the diameter of the front row piles.

[0040] As a preferred embodiment, the spacing between the front row of piles and the rear row of piles is equal to twice the diameter of the front row of piles.

[0041] Embodiment 2

[0042] The foundation pit support structure of the embodiment of the present application, based on the first embodiment, also has the following structural features.

[0043] Figure 3 This is a schematic elevation diagram of the foundation pit support structure of Example 2 of the present application; Figure 4 This is a top perspective view of the foundation pit support structure of Example 2 of this application. Figure 3 and Figure 4 As shown, the connection structure includes:

[0044] A front row pile crown beam 210 is formed at the top of the front row piles 110 and is connected to each of the front row piles as a whole;

[0045] A rear row pile crown beam 220 is formed at the top of the rear row piles 120 and is connected to each of the rear row piles as a whole;

[0046] A plurality of connection beams 230 are provided, and two ends of each connection beam 230 are respectively connected to the front row pile crown beam 210 and the rear row pile crown beam 220 , and each connection beam 230 is arranged at intervals.

[0047] The connection structure is formed by the front row pile crown beam, the rear row pile crown beam and the connection beam. The connection beam is in the form of multiple separate connection beams, and there is a gap between adjacent connection beams, which provides space for the connection beam to expand when exposed to heat. Under the premise of ensuring the strength and rigidity of the foundation pit support structure, the use of materials is also reduced.

[0048] In implementation, the connection beam is located between the front row of piles and the rear row of piles that are arranged opposite to each other, and a connection beam is arranged every other one, two or three rows of piles; Figure 4 The figure shows a situation where a connecting beam is provided for every other set of pile rows;

[0049] The front row of piles and the rear row of piles arranged one by one relative to each other form a group of piles.

[0050] The position of the connecting beam is limited between the front row piles and the rear row piles that are relatively arranged, so that the strength and rigidity of the entire foundation pit support structure are relatively large. According to the specific conditions of the foundation pit, the density of the connecting beam arrangement is selected, and one connecting beam can be arranged every other group, two groups or three groups of piles, provided that the strength and rigidity of the foundation pit support structure can meet the requirements.

[0051] In implementation, the width of the connecting beam is consistent with the diameter of the front row of piles;

[0052] The length of the connecting beam is the distance between the front row piles and the rear row piles which are arranged relatively to each other, and the width of the connecting beam is the distance in a horizontal plane and in a direction perpendicular to the connecting beam.

[0053] In this way, the width of the connecting beam, the diameter of the front row of piles, and the diameter of the rear row of piles are consistent, making the strength and rigidity of the foundation pit support structure greater.

[0054] During implementation, the upper surface of the connecting beam, the upper surface of the front row pile crown beam, and the upper surface of the rear row pile crown beam are flush with each other;

[0055] The lower surface of the connecting beam, the lower surface of the front row pile crown beam, and the lower surface of the rear row pile crown beam are flat; that is, the thickness of the connecting beam, the thickness of the front row pile crown beam, and the thickness of the rear row pile crown beam are equal;

[0056] The connecting beam, the front row pile crown beam, and the rear row pile crown beam are an integrated structure, which are formed by one-time concrete pouring.

[0057] In this way, the upper surface of the foundation pit support structure is a flat structure, which is convenient for construction personnel and construction equipment to pass through. Usually, the upper surface of the foundation pit support structure (the upper surface of the connecting beam, the front row pile crown beam and the rear row pile crown beam) is also flat with the construction ground, which is convenient for construction personnel and construction equipment to move back and forth between the construction ground and the upper surface of the foundation pit support structure during the construction process. The connecting beam, the front row pile crown beam and the rear row pile crown beam are formed by pouring concrete on one side, and the thickness of the connecting beam, the thickness of the front row pile crown beam and the thickness of the rear row pile crown beam are equal, which is convenient for construction.

[0058] In implementation, the front row of pile crown beams are connected end to end to form a closed shape, and the rear row of pile crown beams are connected end to end to form a closed shape.

[0059] In this way, the front row pile crown beams and the rear row pile crown beams are both closed in shape, and the strength and rigidity of their respective structures are relatively high and are not easily damaged.

[0060] In implementation, such as Figure 3and Figure 4 , the front row piles and the rear row piles are cast-in-place piles; the cast-in-place piles include:

[0061] A steel cage is vertically arranged in a pile hole formed in the foundation soil;

[0062] An I-beam 130 is vertically arranged in the hole surrounded by the steel cage, and the upper end of the I-beam 130 protrudes from the upper end of the steel cage;

[0063] A pile body is formed by pouring concrete inside and outside the steel cage, and the upper end of the I-beam protrudes from the upper end of the pile body;

[0064] The I-beam 130 protrudes from the upper end of the pile body and extends into the crown beam, and the crown beam includes the front row pile crown beam and the rear row pile crown beam.

[0065] The front row piles and the rear row piles are both in the form of cast-in-place piles, and the I-beam protrudes from the upper end of the pile body and extends into the crown beam, so that the fixation between the cast-in-place piles and the crown beam is firm and reliable, thereby making the strength and rigidity of the foundation pit support structure higher.

[0066] In implementation, the height of the I-beam protruding from the upper end of the pile body and extending into the crown beam is greater than or equal to one third of the thickness of the crown beam and less than or equal to four fifths of the thickness of the crown beam.

[0067] In this way, the fixation between the cast-in-place piles and the cap beams is firm and reliable, thereby making the strength and rigidity of the foundation pit support structure higher.

[0068] Embodiment 3

[0069] The foundation pit support structure of the embodiment of the present application, based on the first embodiment, also has the following structural features.

[0070] Figure 5 This is a schematic elevation diagram of the foundation pit support structure of Example 3 of the present application; Figure 6 This is a top perspective view of the foundation pit support structure of Example 3 of this application. Figure 5 and Figure 6 As shown, the connection structure includes:

[0071] A front row pile crown beam 210, formed at the top of the front row piles and connected to each of the front row piles as a whole;

[0072] A rear row pile crown beam 220, formed at the top of the rear row piles and connected to each of the rear row piles as a whole;

[0073] A connecting plate 240, wherein the connecting plate 240 is formed between the front-row pile crown beam 210 and the rear-row pile crown beam 220, and seals the gap between the front-row pile crown beam 210 and the rear-row pile crown beam 220;

[0074] The upper surface of the connecting beam, the upper surface of the front row pile crown beam, and the upper surface of the rear row pile crown beam are flush; the lower surface of the front row pile crown beam and the lower surface of the rear row pile crown beam are flush, and the thickness of the connecting plate is half the thickness of the front row pile crown beam.

[0075] The connection structure is formed by the front row pile crown beam, the rear row pile crown beam and the connection plate. The thickness of the connection plate is half of the thickness of the front row pile crown beam, which reduces the use of materials while ensuring the strength and rigidity of the foundation pit support structure.

[0076] In implementation, the connecting plate, the front row pile crown beam, and the rear row pile crown beam are an integrated structure, which are formed by pouring at one time.

[0077] In implementation, the front row of pile crown beams are connected end to end to form a closed shape, and the rear row of pile crown beams are connected end to end to form a closed shape.

[0078] In this way, the front row pile crown beams and the rear row pile crown beams are both closed in shape, and the strength and rigidity of their respective structures are relatively high and are not easily damaged.

[0079] In implementation, such as Figure 5 and Figure 6 As shown, the front row piles and the rear row piles are cast-in-place piles; the cast-in-place piles include:

[0080] A steel cage is vertically arranged in a pile hole formed in the foundation soil;

[0081] An I-beam 130 is vertically arranged in the hole surrounded by the steel cage, and the upper end of the I-beam protrudes from the upper end of the steel cage;

[0082] The pile body is formed by pouring concrete inside and outside the steel cage, and the upper end of the I-beam 130 protrudes from the upper end of the pile body;

[0083] The I-beam 130 protrudes from the upper end of the pile body and extends into the crown beam, and the crown beam includes the front row pile crown beam and the rear row pile crown beam.

[0084] The front row piles and the rear row piles are both in the form of cast-in-place piles, and the I-beam protrudes from the upper end of the pile body and extends into the crown beam, so that the fixation between the cast-in-place piles and the crown beam is firm and reliable, thereby making the strength and rigidity of the foundation pit support structure higher.

[0085] In implementation, the height of the I-beam protruding from the upper end of the pile body and extending into the crown beam is greater than or equal to one third of the thickness of the crown beam and less than or equal to four fifths of the thickness of the crown beam.

[0086] In this way, the fixation between the cast-in-place piles and the cap beams is firm and reliable, thereby making the strength and rigidity of the foundation pit support structure higher.

[0087] Embodiment 4

[0088] The foundation pit support structure of the embodiment of the present application, based on the first embodiment, also has the following structural features.

[0089] Figure 7 It is a schematic elevation diagram of the foundation pit support structure of the fourth embodiment of the present application; Figure 8 This is a top perspective view of the foundation pit support structure of the fourth embodiment of the present application. Figure 7 and Figure 8 As shown, the connection structure includes:

[0090] A transverse bridging beam 250 is formed at the top of the front row piles 110 and the top of the rear row piles 120 and spans the gap between the front row piles and the rear row piles.

[0091] That is, the connection structure is an integral structure with a transverse span beam. Such a connection structure is easy to construct, and the strength and rigidity of the foundation pit support structure are high.

[0092] In implementation, such as Figure 7 and Figure 8 As shown, the front row piles and the rear row piles are cast-in-place piles; the cast-in-place piles include:

[0093] A steel cage is vertically arranged in a pile hole formed in the foundation soil;

[0094] An I-beam 130 is vertically arranged in the hole surrounded by the steel cage, and the upper end of the I-beam protrudes from the upper end of the steel cage;

[0095] A pile body is formed by pouring concrete inside and outside the steel cage, and the upper end of the I-beam protrudes from the upper end of the pile body;

[0096] The I-beam 130 protrudes from the upper end of the pile body and extends into the transverse bridging beam 250 .

[0097] The front and rear rows of piles are in the form of cast-in-place piles, and the I-beam protrudes from the upper end of the pile body and extends into the crown beam, so that the fixation between the cast-in-place piles and the transverse spanning beam is firm and reliable, thereby making the strength and rigidity of the foundation pit support structure higher.

[0098] In implementation, the height of the I-beam protruding from the upper end of the pile body and extending into the transverse bridging beam is greater than or equal to one third of the thickness of the transverse bridging beam and less than or equal to four fifths of the thickness of the transverse bridging beam.

[0099] In this way, the fixation between the cast-in-place piles and the transverse spanning beams is firm and reliable, thereby making the strength and rigidity of the foundation pit support structure higher.

[0100] In the description of the present application and its embodiments, it should be understood that the orientation or positional relationship indicated by the terms "top", "bottom", "height", etc. is based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing the present application 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, and therefore should not be understood as a limitation on the present application.

[0101] In the present application and its embodiments, unless otherwise clearly specified and limited, the terms "set", "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or a communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0102] In the present application and its embodiments, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0103] The disclosure above provides many different embodiments or examples to realize the different structures of the present application. In order to simplify the disclosure of the present application, the parts and settings of specific examples are described above. Of course, they are only examples, and the purpose is not to limit the present application. In addition, the present application can repeat reference numbers and / or reference letters in different examples, and this repetition is for the purpose of simplification and clarity, which itself does not indicate the relationship between the various embodiments and / or settings discussed. In addition, the various specific processes and material examples provided by the present application, but those of ordinary skill in the art can be aware of the application of other processes and / or the use of other materials.

[0104] Although the preferred embodiments of the present application have been described, those skilled in the art may make other changes and modifications to these embodiments once they have learned the basic creative concept. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications falling within the scope of the present application.

[0105] Obviously, those skilled in the art can make various changes and modifications to the present application without departing from the spirit and scope of the present application. Thus, if these modifications and variations of the present application fall within the scope of the claims of the present application and their equivalents, the present application is also intended to include these modifications and variations.

Claims

1. A foundation pit support structure, characterized in that: include: A plurality of front-row piles, each of which is arranged at intervals around the periphery of the foundation pit, and the front-row piles are arranged in the foundation soil outside the foundation pit; A plurality of rear-row piles, each of which is arranged at intervals around the periphery of the front-row piles, and the rear-row piles are arranged in the foundation soil around the front-row piles; A connecting structure, formed at the top of the front row piles and the rear row piles, fixedly connecting the front row piles and the rear row piles; The number of the front row piles and the rear row piles is the same and they are arranged one to one; The spacing between the front row piles is greater than or equal to 1.5 times the diameter of the front row piles and less than or equal to twice the diameter of the front row piles; The distance between the front row piles and the rear row piles is greater than or equal to twice the diameter of the front row piles and less than or equal to four times the diameter of the front row piles; Wherein, the diameter of the front row of piles is equal to the diameter of the rear row of piles; The connection structure comprises: A front row pile crown beam, formed at the top of the front row piles and connected to each of the front row piles as a whole; A rear row pile crown beam is formed at the top of the rear row piles and is connected to each of the rear row piles as a whole; A plurality of connecting beams, each of which has two ends connected to the front row pile crown beam and the rear row pile crown beam respectively, and each of the connecting beams is arranged at intervals; The connection beam is located between the front row of piles and the rear row of piles that are arranged opposite to each other, and a connection beam is arranged every other one, two or three rows of piles; Wherein, the front row piles and the rear row piles arranged one by one opposite to each other form a group of pile rows; The width of the connecting beam is consistent with the diameter of the front row of piles; The length of the connecting beam is the distance between the front row piles and the rear row piles which are arranged relatively to each other, and the width of the connecting beam is the distance in the horizontal plane and in the direction perpendicular to the connecting beam; The upper surface of the connecting beam, the upper surface of the front row pile crown beam, and the upper surface of the rear row pile crown beam are flat; The lower surface of the connecting beam, the lower surface of the front row pile crown beam, and the lower surface of the rear row pile crown beam are flat; the connecting beam, the front row pile crown beam, and the rear row pile crown beam are an integrated structure, formed by one-time casting; The front row of piles and the rear row of piles are cast-in-place piles.

2. A foundation pit support structure, characterized in that: include: A plurality of front-row piles, each of which is arranged at intervals around the periphery of the foundation pit, and the front-row piles are arranged in the foundation soil outside the foundation pit; A plurality of rear-row piles, each of which is arranged at intervals around the periphery of the front-row piles, and the rear-row piles are arranged in the foundation soil around the front-row piles; A connecting structure, formed at the top of the front row piles and the rear row piles, fixedly connecting the front row piles and the rear row piles; The number of the front row piles and the rear row piles is the same and they are arranged one to one; The spacing between the front row piles is greater than or equal to 1.5 times the diameter of the front row piles and less than or equal to twice the diameter of the front row piles; The distance between the front row piles and the rear row piles is greater than or equal to twice the diameter of the front row piles and less than or equal to four times the diameter of the front row piles; Wherein, the diameter of the front row of piles is equal to the diameter of the rear row of piles; The connection structure comprises: A front row pile crown beam, formed at the top of the front row piles and connected to each of the front row piles as a whole; A rear row pile crown beam is formed at the top of the rear row piles and is connected to each of the rear row piles as a whole; A connecting plate, the connecting plate is formed between the front row pile crown beam and the rear row pile crown beam, and seals the gap between the front row pile crown beam and the rear row pile crown beam; The upper surface of the connecting plate, the upper surface of the front row pile crown beam, and the upper surface of the rear row pile crown beam are flat; the lower surface of the front row pile crown beam and the lower surface of the rear row pile crown beam are flat, and the thickness of the connecting plate is half the thickness of the front row pile crown beam; The connecting plate, the front row pile crown beam, and the rear row pile crown beam are an integrated structure, formed by one-time casting; The front row of pile crown beams are connected end to end to form a closed shape, and the rear row of pile crown beams are connected head to head to form a closed shape; The front row of piles and the rear row of piles are cast-in-place piles.

3. The foundation pit support structure according to claim 1 or 2, characterized in that: The connection structure comprises: A transverse bridging beam is formed at the top ends of the front row piles and the rear row piles and spans the gap between the front row piles and the rear row piles.

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