Water-proximate containment structure of the deep excavation pit for soft soil

Abstract

Water-adjacent containment structure of the deep excavation pit for soft soil, consisting of a containment structure in the land area and a containment structure in the water area; characterized in that The containment structure in the land area is arranged on the inner side of the excavation and comprises an inner diaphragm wall, an outer diaphragm wall, a surcharge slab, and several rows of anchor rods; wherein the inner diaphragm wall and the outer diaphragm wall are arranged at intervals along the inner side of the excavation; wherein the surcharge slab is cast between the heads of the inner diaphragm wall and the outer diaphragm wall, the width of the surcharge slab being greater than the distance between the inner diaphragm wall and the outer diaphragm wall plus the thickness of the inner diaphragm wall and the outer diaphragm wall; wherein the projecting part of the surcharge slab is located on the inner side of the inner diaphragm wall; wherein the upper ends of the several rows of anchor rods are anchored at intervals to the underside of the projecting part of the surcharge slab, the anchor rods being anchored obliquely in the underside below the projecting part of the surcharge slab; wherein the enclosure structure in the water area is arranged on the outer edge of the excavation and on the two side edges of the excavation and comprises several main steel grid cylinders uniformly driven into the seabed as well as several pairs of arcuate secondary steel grid plates connected between two adjacent main steel grid cylinders; wherein the interior of the main steel grid cylinders as well as the secondary grid space formed by two arcuate secondary steel grid plates and two adjacent main steel grid cylinders are filled with sand; wherein two main lattice steel cylinders, which are located symmetrically at the inner ends of the two side lines of the excavation pit, each fit with a pair of end-curved secondary lattice steel plates to the two ends of the inner diaphragm wall of the perimeter structure in the land area, wherein the resulting cavities between the pairs of end-curved secondary lattice steel plates and the internal main lattice steel cylinders of both side lines and the inner diaphragm wall are concreted symmetrically.

Description

Technical area

[0001] The utility model relates to a water-proximate enclosure structure for the deep excavation pit for soft soil. Background technology

[0002] The excavation support structure primarily bears the water and earth pressure generated by the excavation and transfers this pressure to the supporting structures. It is a structure designed to stabilize the excavation, and the water-side support structure is part of the excavation work. This structure serves to ensure the safety of the underground structure and the surrounding area. Support, reinforcement, and protective measures are implemented on the excavation walls and the surrounding environment. Currently, combinations of sheet piles, steel pipe piles, and diaphragm walls are commonly used for the water-side support structure. This combination technology is mature and widely used; however, it requires numerous internal supports, which restricts the working space within the excavation and reduces construction efficiency.Furthermore, ensuring the stability and watertightness of traditional diaphragm walls and sheet pile walls is difficult in deep excavations in soft soil. Therefore, when constructing deep excavations near water in soft soil, it is crucial to reduce the number of internal supports while simultaneously improving the overall stability and watertightness of the excavation's containment structure. Content of the utility model

[0003] The aim of this utility model is to overcome the shortcomings of the existing technology and to provide a water-proximate enclosure structure for the deep excavation pit in soft soil, which not only improves the stability of the enclosure structure of the excavation pit, but also has a flexible arrangement and strong watertightness.

[0004] The present utility model aims to achieve the following: a water-adjacent containment structure for the deep excavation pit for soft soil, consisting of a containment structure in the land area and a containment structure in the water area; characterized in that The containment structure in the land area is arranged on the inner side of the excavation and comprises an inner diaphragm wall, an outer diaphragm wall, a surcharge slab, and several rows of anchor rods; wherein the inner diaphragm wall and the outer diaphragm wall are arranged at intervals along the inner side of the excavation; wherein the surcharge slab is cast between the heads of the inner diaphragm wall and the outer diaphragm wall, the width of the surcharge slab being greater than the distance between the inner diaphragm wall and the outer diaphragm wall plus the thickness of the inner diaphragm wall and the outer diaphragm wall; wherein the projecting part of the surcharge slab is located on the inner side of the inner diaphragm wall; wherein the upper ends of the several rows of anchor rods are anchored at intervals to the underside of the projecting part of the surcharge slab, the anchor rods being anchored obliquely in the underside below the projecting part of the surcharge slab; wherein the enclosure structure in the water area is arranged on the outer edge of the excavation and on the two side edges of the excavation and comprises several main steel grid cylinders uniformly driven into the seabed as well as several pairs of arcuate secondary steel grid plates connected between two adjacent main steel grid cylinders; wherein the interior of the main steel grid cylinders as well as the secondary grid space formed by two arcuate secondary steel grid plates and two adjacent main steel grid cylinders are filled with sand; wherein two main lattice steel cylinders, which are located symmetrically at the inner ends of the two side lines of the excavation pit, each fit with a pair of end-curved secondary lattice steel plates to the two ends of the inner diaphragm wall of the perimeter structure in the land area, wherein the resulting cavities between the pairs of end-curved secondary lattice steel plates and the internal main lattice steel cylinders of both side lines and the inner diaphragm wall are concreted symmetrically.

[0005] In the above water-adjacent enclosure structure of the deep excavation pit for soft soil, the enclosure structure in the land area also includes several concrete counterweights, which are arranged at intervals along the longitudinal direction of the surcharge slab and on the top surface of the surcharge slab between the inner diaphragm wall and the outer diaphragm wall.

[0006] In the above water-adjacent enclosure structure of the deep excavation pit for soft soil, several rows of anchor rods are arranged in the enclosure structure in the land area in the middle of the surcharge plate, occupying one third of the total length of the surcharge plate.

[0007] The water-side containment structure of the deep excavation for soft soil in the present utility model has the following features: The containment structure in the land area uses two diaphragm walls, with a surcharge slab poured on the heads of the diaphragm walls. Concrete counterweights are also installed on the surcharge slab. Several rows of anchor rods are installed in the middle section of the surcharge slab, anchored in the soil body. These rods increase the overturning stability of the entire containment structure in the land area, improve its stability and watertightness, and prevent water ingress into the excavation. In combination with the stable and watertight properties of the main steel lattice cylinder structure of the containment structure in the water area, internal supports can be omitted, creating sufficient space for construction work inside the excavation and significantly increasing practicality. Illustration of the attached drawings Fig. 1 shows the plan of the water-adjacent enclosure structure of the deep excavation pit for soft soil in the present utility model; Fig. 2 shows the cross-sectional view along line AA in Fig. 1. Specific embodiments

[0008] The present utility model is described in more detail below with reference to the illustrations in the attached drawings.

[0009] With reference to Fig. 1 and Fig. 2. The enclosure structure of the deep excavation pit for soft soil in the present utility model consists of an enclosure structure in the land area and an enclosure structure in the water area;

[0010] The perimeter structure in the land area is arranged on the inner side of the excavation 100 and comprises an inner diaphragm wall 11, an outer diaphragm wall 12, a surcharge slab 2, several rows of anchor rods 3, and several concrete counterweights 4; wherein the inner diaphragm wall 11 and the outer diaphragm wall 12 are arranged at intervals along the inner side of the excavation 100, the thickness of the inner diaphragm wall 11 and the thickness of the outer diaphragm wall 12 being identical; wherein the surcharge slab 2 is cast between the heads of the inner diaphragm wall 11 and the outer diaphragm wall 12, the width of the surcharge slab 2 being 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 outer diaphragm wall 12; wherein the projecting part of the surcharge slab 2 is located on the inner side of the inner diaphragm wall 11;wherein the upper ends of the multiple rows of anchor rods 3 are anchored at intervals to the underside of the projecting part of the surcharge plate 2, wherein the anchor rods 3 are anchored obliquely in the soil body below the projecting part of the surcharge plate 2; wherein multiple rows of anchor rods 3 are arranged in the center of the surcharge plate 2 and occupy one-third of the total length of the surcharge plate 2, wherein the number of anchor rods 3 in each row is determined according to the properties of the soil body of the excavation pit 100; wherein multiple concrete counterweights 4 are arranged at intervals along the longitudinal direction of the surcharge plate 2 and on the top face of the surcharge plate 2 between the inner diaphragm wall 11 and the outer diaphragm wall 12. wherein the enclosure structure in the water area is arranged on the outer edge of the excavation pit 100 and on the two side edges of the excavation pit 100 and comprises several main steel grid cylinders 5 driven uniformly into the seabed as well as several pairs of arcuate secondary steel grid plates 6 connected between two adjacent main steel grid cylinders 5; wherein the interior of the main steel grid cylinders 5 as well as the secondary grid space formed by two arcuate secondary steel grid plates 6 and outer walls of the two adjacent main steel grid cylinders 5 are filled with sand 71; wherein two main lattice steel cylinders 5, which are located symmetrically at the inner ends of the two side lines of the excavation pit, each fit with a pair of end-curved secondary lattice steel plates 60 to the two ends of the inner diaphragm wall 11 of the perimeter structure in the land area, wherein the resulting cavities between the pairs of end-curved secondary lattice steel plates 60 and the internal main lattice steel cylinders 5 of both side lines and the inner diaphragm wall 11 are filled symmetrically with concrete 72.

[0011] In the enclosure structure of the deep excavation pit for soft soil in the present utility model, the enclosure structure in the water area comprises main lattice steel cylinders 5 and several pairs of arc-shaped secondary lattice steel plates 6, which are connected between two adjacent main lattice steel cylinders 5 to form a watertight water barrier structure; the enclosure structure in the land area consists of the inner diaphragm wall 11 and the outer diaphragm wall 12, wherein a reinforced concrete surcharge slab 2 is cast onto the head of the inner diaphragm wall 11 and the outer diaphragm wall 12, forming a rigid connection that serves not only as a watertight seal and water barrier, but also as a flood protection structure and viewing platform; concrete counterweights 4 are also attached to the surcharge slab 2 to increase the overturning stability of the two diaphragm walls;In the central area of ​​the perimeter structure in the land area, several rows of anchor rods 3, which are anchored in the soil body, are connected to the internal underside of the ballast batten 2 to further ensure the overall stability of the perimeter structure in the land area.

[0012] The water-adjacent containment structure of the deep excavation pit for soft soil in the present utility model exhibits high stability and strong watertightness, has low impact on the surrounding environment and does not require internal supports within the excavation pit 100, thus providing sufficient space for construction work within the excavation pit 100 and ensuring high practicality.

[0013] The above-mentioned embodiments serve only to illustrate the present utility model and do not constitute a limitation thereof. Those skilled in the relevant technical field may make various modifications or adaptations without deviating from the spirit and scope of the present utility model. Therefore, all equivalent technical solutions should also fall within the scope of protection of this utility model and be defined by the respective claims.

Claims

[1] Water-side containment structure of the deep excavation pit for soft soil, consisting of a containment structure in the land area and a containment structure in the water area; characterized by , that The containment structure in the land area is arranged on the inner side of the excavation and comprises an inner diaphragm wall, an outer diaphragm wall, a surcharge slab, and several rows of anchor rods; wherein the inner diaphragm wall and the outer diaphragm wall are arranged at intervals along the inner side of the excavation; wherein the surcharge slab is cast between the heads of the inner diaphragm wall and the outer diaphragm wall, the width of the surcharge slab being greater than the distance between the inner diaphragm wall and the outer diaphragm wall plus the thickness of the inner diaphragm wall and the outer diaphragm wall; wherein the projecting part of the surcharge slab is located on the inner side of the inner diaphragm wall; wherein the upper ends of the several rows of anchor rods are anchored at intervals to the underside of the projecting part of the surcharge slab, the anchor rods being anchored obliquely in the underside below the projecting part of the surcharge slab; wherein the enclosure structure in the water area is arranged on the outer edge of the excavation and on the two side edges of the excavation and comprises several main steel grid cylinders uniformly driven into the seabed as well as several pairs of arcuate secondary steel grid plates connected between two adjacent main steel grid cylinders; wherein the interior of the main steel grid cylinders as well as the secondary grid space formed by two arcuate secondary steel grid plates and two adjacent main steel grid cylinders are filled with sand; wherein two main lattice steel cylinders, which are located symmetrically at the inner ends of the two side lines of the excavation pit, each fit with a pair of end-curved secondary lattice steel plates to the two ends of the inner diaphragm wall of the perimeter structure in the land area, wherein the resulting cavities between the pairs of end-curved secondary lattice steel plates and the internal main lattice steel cylinders of both side lines and the inner diaphragm wall are concreted symmetrically. [2] Water-near enclosure structure of the deep excavation pit for soft soil according to claim 1, characterized by , that the surrounding structure in the land area also includes several concrete counterweights, which are arranged at intervals along the longitudinal direction of the surcharge slab and on the head surface of the surcharge slab between the inner diaphragm wall and the outer diaphragm wall. [3] Water-near enclosure structure of the deep excavation pit for soft soil according to claim 1, characterized by, that several rows of anchor rods are arranged in the perimeter structure in the land area in the middle of the ballast plate and occupy one third of the total length of the ballast plate.

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