Foundation pit supporting structure and construction method thereof

Abstract

The present application relates to the technical fields of foundation pit support, in particular to a foundation pit support structure and a construction method thereof, comprising a plurality of support piles which are arranged along the edge of the foundation pit at intervals, and each support pile is sleeved with a support transition piece outside, and the support transition piece is used for connecting adjacent support piles; the support transition piece comprises a sleeve ring, an extending arm and a soil retaining strip, the sleeve ring is sleeved on the support pile, one end of the extending arm is fixedly connected to the sleeve ring, a first gap and a second gap are formed in the side wall of the extending arm, and the soil retaining strip is connected between the two extending arms through the first gap and the second gap; the sleeve ring, the extending arm and the soil retaining strip structure of the support transition piece are used to realize flexible connection of adjacent support piles; the soil retaining strip is connected between the two extending arms through the first gap and the second gap, the gap between adjacent support piles is filled, a continuous soil retaining structure is formed, the collapse of the soil body of the side wall of the foundation pit is effectively blocked, and the soil retaining effect of the support structure is improved.

Description

Technical Field

[0001] This invention relates to the field of foundation pit support technology, specifically to a foundation pit support structure and its construction method. Background Technology

[0002] In foundation pit construction, the foundation pit support structure is a core facility for ensuring construction safety and the stability of the surrounding environment. Its main function is to resist soil pressure, water pressure, and other loads on the sidewalls of the foundation pit, preventing accidents such as foundation pit collapse and deformation. Currently, common foundation pit support methods include pile support, sheet pile support, and diaphragm walls. Among them, pile support is widely used due to its convenient construction and strong adaptability. It is usually composed of support piles spaced along the edge of the foundation pit, with adjacent support piles forming an integrated load-bearing system through a certain connection structure.

[0003] However, existing pile support structures have many shortcomings in practical applications, as follows:

[0004] 1. Poor connection flexibility and insufficient adaptability: In traditional pile support, the connecting components between adjacent support piles are mostly fixed structures, which cannot adjust the connection angle and position according to the shape of the foundation pit, the actual construction deviation of the support piles, or the stress requirements of different areas. When the foundation pit is irregular in shape or the support piles are slightly tilted, the connecting components are difficult to align precisely, which can easily lead to gaps or uneven stress, affecting the overall stability of the support.

[0005] 2. Insufficient layering and weak targeting of retaining effect: In the existing support structure, the retaining components between adjacent support piles are usually designed with uniform specifications, which makes it impossible to flexibly adjust the retaining strength according to the geological conditions of different areas of the foundation pit (such as high collapse risk areas and ordinary areas); for high collapse risk areas, a single retaining structure is difficult to provide sufficient anti-collapse capacity; while for ordinary areas, over-strengthening the retaining structure will result in material waste and increased construction costs.

[0006] Therefore, there is an urgent need for a foundation pit support structure and its construction method that allows for easy adjustment of the connection angle and position based on the shape of the foundation pit, the actual construction deviation of the support piles, or the stress requirements of different areas. Summary of the Invention

[0007] To address the shortcomings of existing technologies, the purpose of this invention is to provide a foundation pit support structure and its construction method that facilitates adjusting the connection angle and position according to the shape of the foundation pit, the actual construction deviation of the support piles, or the stress requirements of different areas.

[0008] The technical solution adopted by this invention to solve its technical problem is:

[0009] A foundation pit support structure includes a plurality of support piles spaced apart along the edge of the foundation pit. Each support pile is fitted with a support transition member, which is used to connect adjacent support piles. The support transition member includes a collar, an extension arm, and a retaining strip. The collar is fitted onto the outside of the support pile, and one end of the extension arm is fixedly connected to the collar. A first notch and a second notch are provided on the side wall of the extension arm, and the retaining strip is connected between two extension arms through the first notch and the second notch.

[0010] As a preferred embodiment, a further technical solution of the present invention is:

[0011] Preferably, the outer wall of the support pile is provided with multiple annular grooves spaced apart, and the collar is rotatably connected to the support pile through the annular grooves.

[0012] Preferably, the retaining strip includes a base strip, with a protruding strip at the center of one end of the base strip, and strips can be detachably installed on both the left and right sides of the protruding strip; the width of the end of the base strip away from the protruding strip is adapted to the second notch, the width of the protruding strip is adapted to the first notch, and the overall width of the protruding strip after the strips are installed on both the left and right sides is adapted to the second notch.

[0013] Preferably, the extended arm is provided with several vertical through holes at intervals, and retaining bars are inserted into the through holes.

[0014] This invention also discloses a method for constructing foundation pit support, which utilizes a foundation pit support structure and includes the following steps:

[0015] S1: Based on the shape of the foundation pit and geological conditions, determine the spacing and insertion depth of the support piles set at intervals on the sidewall of the foundation pit, and insert the support piles vertically into the soil layer according to the design position.

[0016] S2: Install a support transition piece in the annular groove of the support pile, and adjust the deflection angle of the extended arm by rotating the collar so that the extended arms of adjacent support piles are opposite each other.

[0017] S3: Insert a retaining strip between the two opposing outriggers.

[0018] 6. The foundation pit support construction method according to claim 5, characterized in that: it further includes,

[0019] S4: Insert retaining bars into the through holes of the extension arm, ensuring that the lower end of the retaining bars is inserted into the soil layer at the bottom of the foundation pit;

[0020] S5: Set up a casting template on the outside of the retaining reinforcement, pour concrete into the casting template, and form an integral retaining wall after the concrete has cured.

[0021] Preferably, in step S3, the two extending arms can be referred to as extending arm A and extending arm B.

[0022] For areas with high collapse risk, a double retaining strip connection is adopted, that is, the first notch of the extended arm A is opposite to the second notch of the extended arm B, and the second notch of the extended arm A is opposite to the first notch of the extended arm B; two retaining strips are inserted between each set of extended arms A and B, and the base strip of the retaining strip is inserted into the second notch at one end away from the protruding strip, and the other end is inserted into the first notch;

[0023] Except for areas with high collapse risk, a single retaining strip connection is adopted. That is, the second notch of the extended arm A is opposite to the second notch of the extended arm B. A retaining strip is inserted between each set of extended arms A and B. The protruding strip of the retaining strip is connected to the two sides of the strip, and the two ends of the retaining strip are respectively inserted into the two second notches.

[0024] The present invention, which adopts the above technical solution, has the following prominent features compared with the prior art:

[0025] This invention achieves flexible connection between adjacent support piles by setting support piles at intervals along the edge of the foundation pit, and using a support transition component consisting of a collar, an extension arm, and a retaining strip. The annular groove on the outer wall of the support pile allows the collar to rotate and adjust the angle of the extension arm, improving installation adaptability. The base strip, protruding strip, and detachable strip structure of the retaining strip can adapt to different gap requirements, achieving rational material utilization and tight connection. The retaining reinforcement inside the extension arm through the hole enhances the overall rigidity and connects to the foundation. Combined with the concrete pouring to form an integral retaining wall, it further improves the load-bearing and deformation resistance. During construction, the scientific arrangement of support piles, adjustment of the extension arm angle, and targeted use of single or double retaining strip connection methods make the construction process convenient and efficient. Ultimately, it achieves a balance of adaptability, safety, and economy of the support structure in different geological and risk areas, effectively preventing foundation pit collapse and ensuring construction stability. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the connection structure of the support transition member when the adhesive strip is not installed in an embodiment of the present invention;

[0027] Figure 2 This is a schematic diagram of the connection structure of the support transition piece after the sticker is installed in an embodiment of the present invention;

[0028] Figure 3 This is a schematic diagram of the support transition component in an embodiment of the present invention;

[0029] Figure 4 This is a schematic diagram of the retaining strip in an embodiment of the present invention;

[0030] Figure 5 This is a structural schematic diagram of the foundation pit support in an embodiment of the present invention.

[0031] Explanation of reference numerals in the attached drawings: 1. Support pile; 2. Support transition piece; 21. Collar; 22. Extending arm; 221. First notch; 222. Second notch; 23. Retaining strip; 231. Foundation strip; 232. Protruding strip; 233. Adhesive strip; 3. Through hole. Detailed Implementation

[0032] The present invention will be further illustrated below with reference to specific embodiments. The purpose of this illustration is solely to provide a better understanding of the invention. Therefore, the examples given do not limit the scope of protection of the present invention.

[0033] like Figures 1 to 5 As shown in the figure, this embodiment provides a foundation pit support structure, including a plurality of support piles 1 spaced apart along the edge of the foundation pit. Multiple annular grooves are spaced apart on the outer wall of each support pile 1. A support transition member 2 is fitted onto the annular groove of each support pile 1. A support ring 21 is rotatably connected to the support pile 1 through the annular groove. The support transition member 2 is used to connect adjacent support piles 1. The support transition member 2 includes a ring 21, an extension arm 22, and a retaining strip 23. The ring 21 is fitted onto the outside of the support pile 1. One end of the extension arm 22 is fixedly connected to the ring 21. A first notch 221 and a second notch 222 are provided on the side wall of the extension arm 22. The retaining strip 23 is connected between the two extension arms 22 through the first notch 221 and the second notch 222.

[0034] During the foundation pit support, the support transition piece 2 on the outside of the support pile 1 can rotate (the support pile 1 is a factory prefabricated part, and the support transition piece 2 is already fitted on it when it leaves the factory). This can meet the support requirements of foundation pits with different shapes. The support transition piece 2 includes a collar 21, an extension arm 22, and a retaining strip 23. The extension arms 22 of adjacent support transition pieces 2 are connected to the retaining strip 23 through the first notch 221 and the second notch 222. After the support pile 1 is fixed, the retaining strip 23 is inserted into the notch on the extension arm 22. The installation of the retaining strip 23 not only strengthens the connection between adjacent support piles 1, but also plays a certain role in support and soil retention. This support structure can freely change the splicing form and splicing shape to meet different support effects and has strong adaptability.

[0035] For example, when supporting a circular pit foundation, first drive the support piles 1 in a ring shape according to the actual situation of the pit foundation. Then, adjust the deflection angle of the outer wall support transition piece 2 of the support piles 1 as needed. Finally, insert the retaining strips 2323 between two opposing retaining strips 23, as shown in the attached figure. Figure 5 As shown, the circular support piles 1 and support transition pieces 2 are distributed in this way, which has higher strength and stronger adaptability.

[0036] Furthermore, the retaining strip 23 includes a base strip 231, with a protruding strip 232 at the center of one end of the base strip 231. Adhesive strips 233 can be detachably installed on both sides of the protruding strip 232. The width of the end of the base strip 231 away from the protruding strip 232 matches the second notch 222, and the width of the protruding strip 232 matches the first notch 221. After the adhesive strips 233 are installed on both sides of the protruding strip 232, the overall width matches the second notch 222. In this embodiment, the adhesive strips 233 are fixed to the sidewall of the protruding strip 232 with screws.

[0037] Furthermore, the extended arm 22 is provided with several vertical through holes 3 at intervals, and retaining bars are inserted into the through holes 3; after the retaining bars are inserted, the support and retaining effect of the entire foundation pit support structure can be enhanced; and the retaining bars can also be used as retaining wall structure steel bars for subsequent construction of retaining walls.

[0038] This invention also discloses a method for constructing foundation pit support, which utilizes a foundation pit support structure and includes the following steps:

[0039] S1: Based on the shape and geological conditions of the foundation pit, determine the spacing and insertion depth of the support piles 1 set at intervals along the sidewalls of the foundation pit, and insert the support piles 1 vertically into the soil layer at the designed positions. Specifically, for areas with high collapse risk, two adjacent support piles 1 can be installed close together; for areas without high collapse risk, two adjacent support piles 1 can be installed far apart.

[0040] S2: Install the support transition piece 2 in the annular groove of the support pile 1, and adjust the deflection angle of the extension arm 22 by rotating the collar 21 so that the extension arms 22 of the adjacent support pile 1 are opposite each other.

[0041] S3: Insert a retaining strip 23 between the two opposing extendable arms 22. The two opposing extendable arms 22 can be referred to as extendable arm A and extendable arm B.

[0042] For areas with high collapse risk, a double retaining strip 23 connection is adopted. Specifically, the first notch 221 of extendable arm A is opposite to the second notch 222 of extendable arm B, and the second notch 222 of extendable arm A is opposite to the first notch 221 of extendable arm B. Two retaining strips 23 are inserted between each set of extendable arms A and B. The base strip 231 of the retaining strip 23, away from the protruding strip 232, is inserted into the second notch 222, and the other end is inserted into the first notch 221. Two retaining strips 23 will connect the two support piles 1, as shown in the attached diagram. Figure 1 As shown, it has higher strength and is more effective in supporting and retaining soil in pit foundations that are prone to collapse.

[0043] Except in areas with high collapse risk, a single retaining strip 23 connection is used. That is, the second notch 222 of extendable arm A is opposite to the second notch 222 of extendable arm B. A retaining strip 23 is inserted between each set of extendable arms A and B. Adhesive strips 233 are connected to both sides of the protruding strip 232 of the retaining strip 23, and both ends of the retaining strip 23 are inserted into the two second notches 222. Only one retaining strip 23 connects two support piles 1, as shown in the attached diagram. Figure 2 As shown, while ensuring the foundation support, the number of support piles 1 is reduced.

[0044] In areas with a high risk of collapse, the following steps can also be taken:

[0045] S4: Insert retaining bars into the through hole 3 of the extension arm 22, ensuring that the lower end of the retaining bars is inserted into the soil layer at the bottom of the foundation pit.

[0046] S5: Set up a casting template on the outside of the retaining reinforcement, pour concrete into the casting template, and form an integral retaining wall after the concrete has cured.

[0047] In summary: In this foundation pit support structure, the support transition piece 2 connects adjacent support piles 1. During foundation pit support, the support transition piece 2 on the outside of the support piles 1 can rotate, thus meeting the support requirements of foundation pits with different shapes. The installation of the retaining strip 23 in the support transition piece 2 not only strengthens the connection between adjacent support piles 1, but also plays a certain role in support and soil retention. This support structure allows for free replacement of splicing forms and shapes to meet different support effects, demonstrating strong adaptability.

[0048] The above description is merely a preferred embodiment of the present invention and is not intended to limit the scope of the invention. All equivalent changes made based on the description and drawings of the present invention are included within the scope of the present invention.

Claims

1. A foundation pit support structure, comprising a plurality of support piles (1) spaced apart along the edge of the foundation pit, characterized in that: Each support pile (1) is fitted with a support transition piece (2), which is used to connect adjacent support piles (1); The support transition component (2) includes a collar (21), an extension arm (22), and a retaining strip (23). The collar (21) is sleeved on the outside of the support pile (1). One end of the extension arm (22) is fixedly connected to the collar (21). A first notch (221) and a second notch (222) are provided on the side wall of the extension arm (22). The retaining strip (23) is connected between the two extension arms (22) through the first notch (221) and the second notch (222). Multiple annular grooves are spaced apart on the outer wall of the support pile (1), and the collar (21) is rotatably connected to the support pile (1) through the annular grooves; The retaining strip (23) includes a base strip (231), a protruding strip (232) is provided at the center of one end of the base strip (231), and strips (233) can be detachably installed on both the left and right sides of the protruding strip (232); the width of the end of the base strip (231) away from the protruding strip (232) is adapted to the second notch (222), the width of the protruding strip (232) is adapted to the first notch (221), and the overall width of the protruding strip (232) after the strips (233) are installed on the left and right sides is adapted to the second notch (222); Several vertical through holes (3) are provided at intervals on the extended arm (22), and retaining bars are inserted into the through holes (3).

2. A method for constructing foundation pit support, characterized in that, The application of the foundation pit support structure according to claim 1 includes the following steps: S1: Based on the shape of the foundation pit and the geological conditions, determine the arrangement spacing and insertion depth of the support piles (1) set at intervals on the side wall of the foundation pit, and insert the support piles (1) vertically into the soil layer according to the design position; S2: Install a support transition piece (2) in the annular groove of the support pile (1), and adjust the deflection angle of the extension arm (22) by rotating the collar (21) so that the extension arms (22) of the adjacent support piles (1) are opposite to each other. S3: Insert a retaining strip (23) between the two opposite extended arms (22).

3. The foundation pit support construction method according to claim 2, characterized in that: It also includes, S4: Insert retaining bars into the through hole (3) of the extension arm (22) to ensure that the lower end of the retaining bars is inserted into the soil layer at the bottom of the pit; S5: Set up a casting template on the outside of the retaining reinforcement, pour concrete into the casting template, and form an integral retaining wall after the concrete has cured.

4. The foundation pit support construction method according to claim 3, characterized in that: In step S3, the two outstretched arms (22) can be referred to as outstretched arm A and outstretched arm B. For areas with high collapse risk, a double retaining strip (23) connection is adopted, that is, the first gap (221) of the extension arm A is opposite to the second gap (222) of the extension arm B, and the second gap (222) of the extension arm A is opposite to the first gap (221) of the extension arm B; two retaining strips (23) are inserted between each set of extension arms A and B, and the base strip (231) of the retaining strip (23) is inserted into the second gap (222) at one end away from the protruding strip (232), and the other end is inserted into the first gap (221); Except for areas with high collapse risk, a single retaining strip (23) connection is adopted. That is, the second notch (222) of the extension arm A is opposite to the second notch (222) of the extension arm B. A retaining strip (23) is inserted between each set of extension arm A and extension arm B. The protruding strip (232) of the retaining strip (23) is connected with a strip (233) on both sides. The two ends of the retaining strip (23) are respectively inserted into the two second notches (222).

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