Enclosure structure of near-water soft soil deep foundation pit

Abstract

The utility model discloses an enclosure structure of a near-water soft soil deep foundation pit. The enclosure structure comprises a land area enclosure structure and a water area enclosure structure. The land area enclosure structure is arranged on the inner side line of the foundation pit and comprises an inner side diaphragm wall, an outer side diaphragm wall, a coping plate and a plurality of rows of anchor rods; the inner side diaphragm wall and the outer side diaphragm wall are arranged on the inner side line of the foundation pit at intervals; the coping plate is poured between the tops of the inner side diaphragm wall and the outer side diaphragm wall; the upper ends of a plurality of rows of anchor rods are anchored on the bottom surface of the wider part of the coping plate at intervals and are obliquely anchored in the soil body; the water area enclosure structure is arranged on the outer side line of the foundation pit and the side lines on the two sides of the foundation pit and comprises a plurality of main lattice steel cylinders arranged on the seabed at the same interval and a plurality of pairs of arc-shaped auxiliary lattice steel plates connected between every two adjacent main lattice steel cylinders. The inner cavities of the main lattice steel cylinders and an auxiliary lattice bin formed by the two arc-shaped auxiliary lattice steel plates and the two adjacent main lattice steel cylinders are backfilled with sand. The stability of the foundation pit support structure can be improved, arrangement is flexible, and the waterproof performance is high.

Description

Technical Field

[0001] The utility model relates to a retaining structure for a deep foundation pit in soft soil near water. Background Technique

[0002] The retaining structure of the foundation pit mainly bears the water pressure and soil pressure generated by the unloading during the excavation of the foundation pit, and transfers this pressure to the support. It is a structure for stabilizing the foundation pit. The retaining of the foundation pit near water belongs to the foundation pit engineering. The retaining of the foundation pit near water is to ensure the safety of the underground structure construction and the surrounding environment of the foundation pit, and adopt support, reinforcement and protection measures for the side wall of the foundation pit and the surrounding environment. At present, the combined structure of steel sheet piles, steel pipe piles and diaphragm walls is usually adopted for the retaining structure near water. This combined structure has mature technology and wide application. However, the combined structure of steel sheet piles, steel pipe piles and diaphragm walls requires a large number of internal supports, resulting in a narrow construction space inside the foundation pit and affecting the construction efficiency. In addition, when excavating deep foundation pits in soft soil areas, it is difficult to ensure the stability and waterproof performance of traditional diaphragm walls and steel sheet pile retaining structures. Therefore, how to reduce the internal supports of the foundation pit near water and improve the overall stability and waterproof performance of the retaining structure of the foundation pit is very meaningful for the construction of deep foundation pits near water in soft soil areas. Content of the Utility Model

[0003] The purpose of the utility model is to overcome the defects of the prior art and provide a retaining structure for a deep foundation pit in soft soil near water, which can not only improve the stability of the retaining structure of the foundation pit, but also has flexible layout and strong waterproof performance.

[0004] The purpose of the utility model is realized as follows: a retaining structure for a deep foundation pit in soft soil near water, including a retaining structure in the land area and a retaining structure in the water area; wherein,

[0005] The retaining structure in the land area is arranged on the inner edge line of the foundation pit and includes an inner diaphragm wall, an outer diaphragm wall, a capping beam and several rows of anchor rods; the inner diaphragm wall and the outer diaphragm wall are arranged at intervals on the inner edge line of the foundation pit; the capping beam is poured between the top of the inner diaphragm wall and the top of the outer diaphragm wall, and the width of the capping beam is greater than the sum of the spacing between the inner diaphragm wall and the outer diaphragm wall, the thickness of the inner diaphragm wall and the thickness of the outer diaphragm wall. The widened part of the capping beam is located inside the inner diaphragm wall; the upper ends of several rows of anchor rods are anchored at intervals on the bottom surface of the widened part of the capping beam, and several rows of anchor rods are obliquely anchored in the soil body below the widened part of the capping beam;

[0006] The retaining structure in the water area is arranged on the outer edge line of the foundation pit and on both side edge lines of the foundation pit and includes a plurality of main grid steel cylinders uniformly driven into the seabed at intervals and a plurality of pairs of arc-shaped sub-grid steel plates connected between two adjacent main grid steel cylinders; sand is backfilled in the inner cavity of the main grid steel cylinder and in the sub-grid bin formed by two arc-shaped sub-grid steel plates and two adjacent main grid steel cylinders;

[0007] Two main grid steel cylinders located at the inner ends of the two side edges of the foundation pit are respectively engaged with the two ends of the inner ground connection wall of the land area retaining structure through a pair of end arc-shaped auxiliary grid steel plates. The two pairs of end arc-shaped auxiliary grid steel plates are respectively poured with concrete in the cavity formed by the main grid steel cylinders at the inner ends of the two side edges and the inner ground connection wall.

[0008] The above-mentioned retaining structure for deep foundation pit in soft soil near water, wherein the land area retaining structure also includes a plurality of concrete counterweight blocks spaced apart along the length direction of the top plate and on the top surface of the top plate between the inner ground connection wall and the outer ground connection wall.

[0009] In the above-mentioned retaining structure for a deep foundation pit in soft soil near water, several rows of anchor rods in the land area retaining structure are arranged in the middle of the top plate and occupy one third of the entire top plate length.

[0010] The retaining structure of the soft soil deep foundation pit near water of the present invention has the following characteristics: the retaining structure of the land area adopts two ground-connected walls, and a pressure plate is cast on the top of the two ground-connected walls, and a counterweight block of concrete is arranged on the pressure plate, and a plurality of rows of anchor rods anchored in the soil are connected in the mid-span area of the pressure plate, thereby increasing the overall anti-overturning ability of the retaining structure of the land area, improving the stability and waterproofness of the retaining structure of the land area, and preventing the foundation pit from being damaged by seepage; combined with the stability and waterproofness of the main steel cylinder structure of the retaining structure of the water area, the overall retaining structure of the foundation pit does not need to be provided with internal support, which provides sufficient space for the construction inside the foundation pit and is highly practical. BRIEF DESCRIPTION OF THE DRAWINGS

[0011] Figure 1 It is a plan view of the retaining structure of a deep foundation pit of soft soil near water according to the utility model;

[0012] Figure 2 yes Figure 1 AA section view in. DETAILED DESCRIPTION

[0013] The present invention will be further described below with reference to the accompanying drawings.

[0014] See also Figure 1 and Figure 2 The retaining structure of the soft soil deep foundation pit near water of the utility model includes a land area retaining structure and a water area retaining structure; wherein,

[0015] The retaining structure of the land area is arranged on the inner edge line of the foundation pit 100 and includes an inner diaphragm wall 11, an outer diaphragm wall 12, a capping beam 2, several rows of anchor rods 3 and a plurality of concrete counterweight blocks 4; wherein, the inner diaphragm wall 11 and the outer diaphragm wall 12 are arranged at intervals on the inner edge line of the foundation pit 100, and the thickness of the inner diaphragm wall 11 is the same as that of the outer diaphragm wall 12; the capping beam 2 is cast between the top of the inner diaphragm wall 11 and the top of the outer diaphragm wall 12, and the width of the capping beam 2 is greater than the distance between the inner diaphragm wall 11 and the outer diaphragm wall 12 plus the thickness of the inner diaphragm wall 11 and the thickness of the outer diaphragm wall 12, and the widened part of the capping beam 2 is located inside the inner diaphragm wall 11; the upper ends of several rows of anchor rods 3 are anchored at intervals on the bottom surface of the widened part of the capping beam 2, several rows of anchor rods 3 are obliquely anchored in the soil body below the widened part of the capping beam 2, several rows of anchor rods 3 are arranged in the middle of the capping beam 2 and account for one-third of the total length of the capping beam 2, and the number of each row of anchor rods 3 is determined according to the properties of the soil where the foundation pit 100 is located; a plurality of concrete counterweight blocks 4 are placed at intervals on the top surface of the capping beam 2 between the inner diaphragm wall 11 and the outer diaphragm wall 12 along the length direction of the capping beam 2.

[0016] The retaining structure of the water area is arranged on the outer edge line of the foundation pit 100 and on both side edge lines of the foundation pit 100 and includes a plurality of main lattice steel cylinders 5 driven into the seabed at consistent intervals and a plurality of pairs of arc-shaped secondary lattice steel plates 6 connected between two adjacent main lattice steel cylinders 5; the inner cavities of the main lattice steel cylinders 5 and the secondary lattice bins formed by two arc-shaped secondary lattice steel plates 6 and the outer walls of two adjacent main lattice steel cylinders 5 are backfilled with sand 71;

[0017] Two main lattice steel cylinders 5 respectively located at the inner ends of both side edge lines of the foundation pit are respectively engaged with the two ends of the inner diaphragm wall 11 of the retaining structure of the land area through a pair of end arc-shaped secondary lattice steel plates 60, and concrete 72 is poured into the cavities formed by the two pairs of end arc-shaped secondary lattice steel plates 60 corresponding to the main lattice steel cylinders 5 at the inner ends of both side edge lines and the inner diaphragm wall 11.

[0018] For the retaining structure of the deep foundation pit in soft soil near water of the present utility model, the retaining structure of the water area adopts the main lattice steel cylinders 5 and a plurality of pairs of arc-shaped secondary lattice steel plates 6 connected between two adjacent main lattice steel cylinders 5 to form a tight water-stop structure; the retaining structure of the land area adopts the inner diaphragm wall 11 and the outer diaphragm wall 12, and a reinforced concrete capping beam 2 is cast on the tops of the inner diaphragm wall 11 and the outer diaphragm wall 12 to form a rigid connection, which can not only play the role of waterproofing and water blocking, but also serve as a flood control structure and a viewing platform; counterweight blocks 4 are also arranged on the capping beam 2 to enhance the anti-overturning ability of the two diaphragm walls; in the mid-span area section of the retaining structure of the land area, several rows of anchor rods 3 anchored in the soil body are connected to the inner bottom surface of the capping beam 2 to further ensure the overall stability of the retaining structure of the land area.

[0019] The retaining structure of the waterfront soft soil deep foundation pit of the utility model has high stability, strong waterproof performance, little impact on the surrounding environment, and no internal support needs to be set inside the foundation pit 100, providing sufficient space for the construction inside the foundation pit 100 and having strong practicability.

[0020] The above embodiments are only for illustrating the utility model and not for limiting the utility model. Those skilled in the relevant technical fields can also make various transformations or modifications without departing from the spirit and scope of the utility model. Therefore, all equivalent technical solutions should also belong to the scope of the utility model and should be defined by each claim.

Claims

1. A retaining structure for a deep foundation pit in soft soil near water, comprising a retaining structure in the land area and a retaining structure in the water area; characterized in that, The retaining structure in the land area is arranged on the inner edge line of the foundation pit and includes an inner diaphragm wall, an outer diaphragm wall, a capping beam and several rows of anchor rods; the inner diaphragm wall and the outer diaphragm wall are arranged at intervals on the inner edge line of the foundation pit; the capping beam is cast between the top of the inner diaphragm wall and the top of the outer diaphragm wall, and the width of the capping beam is greater than the sum of the spacing between the inner diaphragm wall and the outer diaphragm wall, the thickness of the inner diaphragm wall and the thickness of the outer diaphragm wall, and the extended part of the capping beam is located inside the inner diaphragm wall; the upper ends of several rows of anchor rods are anchored at intervals on the bottom surface of the extended part of the capping beam, and several rows of anchor rods are obliquely anchored in the soil body below the extended part of the capping beam; The retaining structure in the water area is arranged on the outer edge line of the foundation pit and on both side edge lines of the foundation pit and includes a plurality of main grid steel cylinders driven into the seabed at consistent intervals and a plurality of pairs of arc-shaped secondary grid steel plates connected between two adjacent main grid steel cylinders; sand is backfilled in the inner cavity of the main grid steel cylinder and in the secondary grid bins formed by two arc-shaped secondary grid steel plates and two adjacent main grid steel cylinders; Two main grid steel cylinders respectively located at the inner ends of both side edge lines of the foundation pit are respectively engaged with the two ends of the inner diaphragm wall of the retaining structure in the land area through a pair of end arc-shaped secondary grid steel plates, and concrete is cast in the cavities formed by the two pairs of end arc-shaped secondary grid steel plates, the main grid steel cylinders at the inner ends of both side edge lines and the inner diaphragm wall.

2. The retaining structure of the waterfront soft soil deep foundation pit according to claim 1, characterized in that, The retaining structure in the land area further includes a plurality of concrete counterweight blocks placed at intervals on the top surface of the capping beam along the length direction of the capping beam and between the inner diaphragm wall and the outer diaphragm wall.

3. The retaining structure of the waterfront soft soil deep foundation pit according to claim 1, characterized in that, Several rows of anchor rods in the retaining structure in the land area are arranged in the middle of the capping beam and account for one-third of the entire length of the capping beam.

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