Steel sheet pile and pipe pile combined foundation pit supporting structure

Abstract

This application discloses a combined sheet pile and pipe pile foundation pit support structure, belonging to the field of foundation pit support technology. It includes sheet pile support walls, with two rows of sheet pile support walls arranged side-by-side inside the foundation pit. This application forms a barrier and support for the foundation by arranging two rows of sheet pile support walls side-by-side inside the foundation pit, resisting soil pressure around the foundation pit. Support walers are fixedly connected to the inner sides of both rows of sheet pile support walls, serving to connect and distribute the stress. Insertion slots provide a stable position for the pipe pile installation, utilizing the high strength characteristics of the pipe piles to enhance the vertical bearing capacity and stability of the entire support structure. Through the cooperation between the support walers, connecting seats, and installation slots, the internal steel pipe support is installed between the two rows of sheet pile support walls, further improving the lateral support force between the two rows of sheet pile support walls and ensuring the stability of the entire combined structure in complex geological environments.

Description

Technical Field

[0001] This application relates to the field of foundation pit support technology, and in particular to a combined steel sheet pile and pipe pile foundation pit support structure. Background Technology

[0002] Excavation pit support refers to the measures taken to support, reinforce, and protect the sidewalls and surrounding environment of an excavation pit to ensure the safety of underground structure construction and the environment around the pit, thereby ensuring the stability of the soil around the pit. Currently, excavation pit support technologies mainly include various forms such as sheet pile support, soil nailing wall support, and pipe pile support. Sheet pile support forms a continuous wall by driving sheet piles into the ground to block earth pressure; soil nailing wall support forms a reinforcement layer by installing soil nails in the soil and spraying concrete; and pipe pile support enhances stability by driving pipe piles and installing anchor cables.

[0003] In engineering construction, due to regional differences, the soil structure varies from place to place, and each foundation pit support method has its own advantages and disadvantages. In some complex geological structures, it is no longer possible to carry out the work by relying on only one foundation pit support method. Therefore, an improvement is now made to a steel sheet pile and pipe pile combined foundation pit support structure. Utility Model Content

[0004] To address the shortcomings of existing technologies, this application provides a combined steel sheet pile and pipe pile foundation pit support structure, which overcomes the deficiencies of existing technologies and aims to solve the problem that in engineering construction, due to different regions and soil structures, each foundation pit support method has its own advantages and disadvantages, and in some complex geological structures, it is no longer possible to carry out operations using only one foundation pit support method.

[0005] To achieve the above objectives, this application provides the following technical solution: a combined sheet pile and pipe pile foundation pit support structure, comprising sheet pile support walls, wherein two rows of sheet pile support walls are arranged side by side inside the foundation pit, and support walers are fixedly connected to the inner sides of both rows of sheet pile support walls. A plurality of insertion slots are provided between the sheet pile support walls and the support walers, and pipe piles are slidably inserted into the interior of each of the insertion slots. A connecting seat is fixedly installed on the inner side of the support walers, and an installation groove is provided on the top of the connecting seat. An internal steel pipe support with telescopic function is provided inside the installation groove, and the internal steel pipe support is located between the two rows of sheet pile support walls.

[0006] By adopting the above technical solution, two rows of steel sheet pile retaining walls are arranged side by side inside the foundation pit, which can form a barrier and support for the foundation from both sides. With the inherent characteristics of the steel sheet pile retaining walls, they can effectively resist the soil pressure around the foundation pit. The inner sides of the two rows of steel sheet pile retaining walls are fixedly connected with retaining walers, which play the role of connecting and distributing the force. By setting the insertion slot, a stable position is provided for the installation of pipe piles. The high strength characteristics of pipe piles can be used to enhance the vertical bearing capacity and stability of the entire retaining structure. Through the cooperation between the retaining walers, connecting seats and installation slots, the steel pipe internal support is installed between the two rows of steel sheet pile retaining walls, further improving the lateral support force between the two rows of steel sheet pile retaining walls and ensuring the stability of the entire composite structure in complex geological environments.

[0007] As a preferred technical solution of this application, the sheet pile support wall is composed of two types of long sheet piles and short sheet piles of different lengths, with the tops of the long sheet piles and the tops of the short sheet piles on the same horizontal plane.

[0008] By adopting the above technical solutions, long sheet piles can ensure sufficient depth of insertion into hard rock layers, ensuring that the bearing capacity and stability of the sheet pile retaining wall meet the construction requirements. Short sheet piles can minimize the depth and number of sheet pile retaining walls inserted into hard rock layers, reducing construction difficulty.

[0009] As a preferred technical solution of this application, the outer walls of the pipe piles on both sides are respectively attached to the inner walls of the sheet pile support wall and the support waler.

[0010] By adopting the above technical solution, this fitting design can form a tight force transmission path between the pipe piles, the sheet pile retaining wall, and the retaining waler. When the sheet pile retaining wall is subjected to soil pressure around the foundation pit, part of the force can be transferred to the pipe piles through the outer wall that is fitted with the pipe piles. The pipe piles, with their high strength characteristics, bear and disperse these forces, and then transfer the force to the retaining waler through the other outer wall that is fitted with the retaining waler. The retaining waler then distributes the force more evenly throughout the entire support system.

[0011] As a preferred technical solution of this application, the steel pipe inner support includes a fixed cylinder, a telescopic rod is threaded into the inside of the fixed cylinder, and a connector is rotatably connected to the opposite ends of the fixed cylinder and the telescopic rod, and the connector is slidably inserted into the inside of the mounting groove.

[0012] By adopting the above technical solution, the overall length of the steel pipe inner support can be easily changed by rotating the telescopic rod, which can be used for foundation pits of different widths. The connector is slidably inserted into the installation groove to realize the rapid installation between the steel pipe inner support and the connecting seat.

[0013] As a preferred technical solution of this application, the connecting seat is fixedly connected to the connecting member by connecting bolts. The external dimensions of the connecting member are adapted to the internal space dimensions of the mounting groove, and the connecting member is provided with positioning holes for the connecting bolts to be inserted.

[0014] By adopting the above technical solution, the connector is fixedly installed inside the connector seat by connecting bolts, thereby achieving the fixation of the internal support of the steel pipe.

[0015] As a preferred technical solution of this application, the side wall of the telescopic rod is provided with a scale.

[0016] By adopting the above technical solution, the scale provides a unified reference for the synchronous adjustment of multiple sets of internal steel pipe supports.

[0017] As a preferred technical solution of this application, the outer surface of the support waler is provided with an installation hole, and an anchor rod is inserted into the installation hole. The front end of the anchor rod passes through the sheet pile support wall and is inserted into the foundation pit.

[0018] By adopting the above technical solution, the anchor rod penetrates the sheet pile retaining wall and extends deep into the soil layer inside the foundation pit. With the help of the friction and anchoring force of the soil layer, the lateral soil pressure on the sheet pile retaining wall can be transferred to the deep stable soil, forming an effective tensile balance and greatly improving the overturning resistance and sliding resistance of the sheet pile retaining wall.

[0019] In summary, the beneficial effects of this application are as follows:

[0020] 1. In this application, two rows of sheet pile retaining walls are arranged side by side inside the foundation pit, forming a barrier and support for the foundation from both sides. Utilizing the inherent characteristics of the sheet pile retaining walls, they effectively resist the soil pressure around the foundation pit. Both rows of sheet pile retaining walls are fixedly connected to retaining walers on their inner sides. The retaining walers serve to connect and distribute the stress. By setting insertion slots, a stable position is provided for the installation of pipe piles. The high strength characteristics of the pipe piles are utilized to enhance the vertical bearing capacity and stability of the entire retaining structure. Through the cooperation between the retaining walers, connecting seats, and installation slots, the steel pipe internal support is installed between the two rows of sheet pile retaining walls, further enhancing the lateral support force between the two rows of sheet pile retaining walls and ensuring the stability of the entire composite structure in complex geological environments.

[0021] 2. In this application, long sheet piles can ensure sufficient depth of insertion into hard rock layers, ensuring that the bearing capacity and stability of the sheet pile retaining wall meet the construction requirements, while short sheet piles can minimize the depth and number of sheet pile retaining walls inserted into hard rock layers, thus reducing construction difficulty.

[0022] 3. In this application, the overall length of the steel pipe internal support can be easily changed by rotating the telescopic rod to accommodate foundation pits of different widths. The connector is slidably inserted into the installation groove and fixed by connecting bolts, enabling rapid installation between the steel pipe internal support and the connecting seat. The scale provides a unified reference for the synchronous adjustment of multiple sets of steel pipe internal supports. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the overall structure of this application;

[0024] Figure 2 This is a partial structural diagram of this application;

[0025] Figure 3 This is a schematic diagram of the structural composition of the sheet pile retaining wall of this application;

[0026] Figure 4 This is a schematic diagram of the structural composition of the steel pipe internal support of this application.

[0027] Explanation of reference numerals in the attached figures:

[0028] 1. Sheet pile retaining wall; 101. Long sheet pile; 102. Short sheet pile; 2. Insertion groove; 3. Pipe pile; 4. Retaining waler; 5. Mounting hole; 6. Anchor bolt; 7. Connecting seat; 8. Mounting groove; 9. Steel pipe inner support; 91. Fixing cylinder; 92. Telescopic rod; 93. Connecting piece; 94. Positioning hole; 95. Scale; 10. Connecting bolt. Detailed Implementation

[0029] To make the technical means, creative features, objectives and effects of this application easy to understand, the following describes this application in conjunction with specific implementation methods.

[0030] like Figure 1 - Figure 4As shown in the figure, this embodiment provides a combined sheet pile and pipe pile foundation pit support structure, including a sheet pile retaining wall 1. Two rows of sheet pile retaining walls 1 are arranged side-by-side inside the foundation pit. Retaining walers 4 are fixedly connected to the inner sides of both rows of sheet pile retaining walls 1. Several insertion slots 2 are provided between the sheet pile retaining walls 1 and the retaining walers 4. Pipe piles 3 are slidably inserted into the interior of each insertion slot 2. Connecting seats 7 are fixedly installed on the inner side of the retaining walers 4. An installation groove 8 is provided on the top of the connecting seat 7. A telescopic steel pipe internal support 9 is provided inside the installation groove 8. The steel pipe internal support 9 is located between the two rows of sheet pile retaining walls 1. In use, two rows of steel sheet pile retaining walls 1 are set up side by side inside the foundation pit to form a barrier and support for the foundation, which is used to resist the soil pressure around the foundation pit. The retaining walers 4 play the role of connecting and distributing the force. Pipe piles 3 are inserted and installed in the insertion slots 2, which can utilize the high strength characteristics of the pipe piles 3 to enhance the vertical bearing capacity and stability of the entire retaining structure. Through the cooperation between the retaining walers 4, the connecting seats 7 and the installation slots 8, the steel pipe internal support 9 is installed between the two rows of steel sheet pile retaining walls 1, which further enhances the lateral support force between the two rows of steel sheet pile retaining walls 1 and ensures the stability of the entire composite structure in complex geological environments.

[0031] In this embodiment, as Figure 3 As shown, the sheet pile retaining wall 1 is composed of two different lengths of long sheet piles 101 and short sheet piles 102. The tops of the long sheet piles 101 and the short sheet piles 102 are on the same horizontal plane. In use, the long sheet piles 101 can ensure sufficient depth of insertion into hard rock layers, ensuring that the bearing capacity and stability of the sheet pile retaining wall 1 meet the construction requirements. The short sheet piles 102 can minimize the depth and number of sheet piles inserted into hard rock layers, reducing the construction difficulty.

[0032] In this embodiment, as Figure 1 As shown, the outer walls of the pipe pile 3 on both sides are respectively attached to the inner walls of the sheet pile retaining wall 1 and the retaining waler 4. In use, this attachment design allows the pipe pile 3 to form a tight force transmission path with the sheet pile retaining wall 1 and the retaining waler 4. When the sheet pile retaining wall 1 is subjected to soil pressure around the foundation pit, part of the force can be transferred to the pipe pile 3 through the outer wall attached to the pipe pile 3. The pipe pile 3 bears and disperses these forces with its own high strength characteristics, and then transfers the force to the retaining waler 4 through the other outer wall attached to the retaining waler 4. The retaining waler 4 then distributes the force more evenly to the entire support system.

[0033] In this embodiment, as Figure 1 and 4As shown, the steel pipe inner support 9 includes a fixed cylinder 91, with a telescopic rod 92 threaded into the inside of the fixed cylinder 91. Both the fixed cylinder 91 and the telescopic rod 92 are rotatably connected to a connector 93 at opposite ends. The connector 93 is slidably inserted into the installation groove 8. In use, the overall length of the steel pipe inner support 9 can be easily changed by rotating the telescopic rod 92 to accommodate foundation pits of different widths. The connector 93 is slidably inserted into the installation groove 8 to achieve quick installation between the steel pipe inner support 9 and the connecting seat 7.

[0034] In this embodiment, as Figure 1 and 4 As shown, the connecting seat 7 is fixedly connected to the connecting piece 93 by the connecting bolt 10. The external dimensions of the connecting piece 93 are adapted to the internal space dimensions of the mounting groove 8. The connecting piece 93 is provided with a positioning hole 94 for the connecting bolt 10 to be inserted. In use, the connecting piece 93 is fixedly installed inside the connecting seat 7 by the connecting bolt 10 to fix the steel pipe internal support 9.

[0035] In this embodiment, as Figure 4 As shown, the side wall of the telescopic rod 92 is equipped with a scale 95. During use, the scale 95 provides a unified reference for the synchronous adjustment of multiple sets of steel pipe internal supports 9.

[0036] In this embodiment, as Figure 1 and 2 As shown, an installation hole 5 is provided through the outer surface of the retaining waler 4. An anchor rod 6 is inserted into the installation hole 5. The front end of the anchor rod 6 passes through the sheet pile retaining wall 1 and is inserted into the foundation pit. When in use, the anchor rod 6 penetrates the sheet pile retaining wall 1 and goes deep into the soil layer inside the foundation pit. With the help of the friction and anchoring force of the soil layer, it can transfer the lateral soil pressure on the sheet pile retaining wall 1 to the deep stable soil, forming an effective tensile balance and greatly improving the overturning resistance and sliding resistance of the sheet pile retaining wall 1.

[0037] The working principle of this application is as follows: When using the steel sheet pile and pipe pile combined foundation pit support structure of this application, firstly, the staff conducts a comprehensive geological survey of the foundation pit construction area to clarify the soil layer distribution, groundwater level, surrounding buildings, and underground pipelines. Based on this, the construction positions of the long steel sheet piles 101 and short steel sheet piles 102 are determined and marked. A drilling machine is then used to drill holes at the marked locations of the long steel sheet piles 101. After the drilling is completed, a pile driver is immediately used to alternately drive the long steel sheet piles 101 and short steel sheet piles 102 into the ground, forming two rows of parallel steel sheet pile support walls 1. After the steel sheet pile support walls 1 are constructed, the excavation of the foundation pit can begin. After the earthwork excavation depth reaches 50cm, the retaining walers 4 and steel pipe internal supports 9 are installed and reinforced in a timely manner. This forms an insertion groove 2 between the retaining walers 4 and the steel sheet pile retaining wall 1. Then, the pipe piles 3 are slidably inserted into the insertion groove 2 one by one. Anchor rods 6 are then inserted into the outer surface of the retaining walers 4 through the pre-drilled installation holes 5. Special equipment is used to drive the front end of the anchor rods 6 through the steel sheet pile retaining wall 1 into the soil layer around the foundation pit. Subsequently, the earthwork excavation in the foundation pit continues. Every 2m of excavation, the retaining walers 4 and steel sheet pile retaining wall 1 must be installed again. The foundation pit construction is carried out in strict accordance with the principle of "supporting before excavation and excavating in layers" to ensure the internal stability of the foundation pit.

[0038] In the description of this application, it should be noted that the terms "upper," "lower," "inner," "outer," "front end," "rear end," "both ends," "one end," and "the other end," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on this application. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0039] In the description of this application, it should be noted that, unless otherwise explicitly specified and limited, the terms "installed," "equipped with," "connected," etc., should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium; it can be a connection within two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0040] The present application has been described above with reference to specific embodiments. However, those skilled in the art should understand that these descriptions are exemplary and not intended to limit the scope of protection of the present application. Those skilled in the art can make various modifications and variations to the present application based on its spirit and principles, and these modifications and variations are also within the scope of the present application.

Claims

1. A combined sheet pile and pipe pile foundation pit support structure, comprising a sheet pile retaining wall (1), characterized in that, The sheet pile retaining wall (1) is arranged in two rows in parallel inside the foundation pit. The inner sides of the two rows of sheet pile retaining walls (1) are fixedly connected with retaining walers (4). Several insertion slots (2) are provided between the sheet pile retaining wall (1) and the retaining walers (4). Pipe piles (3) are slidably inserted into the inside of the several insertion slots (2). A connecting seat (7) is fixedly installed on the inner side of the retaining walers (4). An installation slot (8) is opened on the top of the connecting seat (7). A steel pipe internal support (9) with telescopic function is provided inside the installation slot (8). The steel pipe internal support (9) is located between the two rows of sheet pile retaining walls (1).

2. The steel sheet pile and pipe pile combined foundation pit support structure according to claim 1, characterized in that, The sheet pile retaining wall (1) is composed of two different lengths of long sheet piles (101) and short sheet piles (102), with the tops of the long sheet piles (101) and the tops of the short sheet piles (102) on the same horizontal plane.

3. The steel sheet pile and pipe pile combined foundation pit support structure according to claim 1, characterized in that, The outer walls of the pipe pile (3) on both sides are respectively attached to the inner walls of the sheet pile retaining wall (1) and the retaining waler (4).

4. The steel sheet pile and pipe pile combined foundation pit support structure according to claim 1, characterized in that, The steel pipe inner support (9) includes a fixed cylinder (91), and a telescopic rod (92) is threaded into the inside of the fixed cylinder (91). A connector (93) is rotatably connected to the opposite ends of the fixed cylinder (91) and the telescopic rod (92). The connector (93) is slidably inserted into the inside of the mounting groove (8).

5. A combined sheet pile and pipe pile foundation pit support structure according to claim 4, characterized in that, The connecting seat (7) is fixedly connected to the connecting piece (93) by the connecting bolt (10). The external dimensions of the connecting piece (93) are adapted to the internal space dimensions of the mounting groove (8). The connecting piece (93) has a positioning hole (94) for the connecting bolt (10) to be inserted.

6. A combined sheet pile and pipe pile foundation pit support structure according to claim 4, characterized in that, The telescopic rod (92) has a scale (95) on its side wall.

7. A combined sheet pile and pipe pile foundation pit support structure according to claim 1, characterized in that, The outer surface of the support waler (4) is provided with an installation hole (5), and an anchor rod (6) is inserted into the installation hole (5). The front end of the anchor rod (6) passes through the sheet pile support wall (1) and is inserted into the foundation pit.

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