Deep foundation pit double-T-shaped underground diaphragm wall adjacent to subway viaduct and deep foundation pit construction method

Abstract

The invention discloses a deep foundation pit double-T-shaped underground diaphragm wall adjacent to a subway viaduct and a deep foundation pit construction method.The deep foundation pit double-T-shaped underground diaphragm wall comprises a plurality of underground diaphragm wall units continuously arranged in the circumferential direction of a foundation pit, and each underground diaphragm wall unit comprises an outer wall plate and a plurality of T-shaped connecting pieces, the adjacent end is connected to the adjacent end of the external wall panel of the adjacent diaphragm wall unit; the inner wall plate and the outer wall plate are oppositely arranged, and the length of the inner wall plate is smaller than that of the outer wall plate; the supporting wall plate is arranged between the outer wall plate and the inner wall plate, and the two ends of the supporting wall plate are connected to the outer wall plate and the inner wall plate in a supporting mode respectively. The problem that the structural safety of the existing subway viaduct is affected due to the fact that a traditional underground diaphragm wall is adopted for construction of the foundation pit adjacent to the existing subway viaduct and horizontal displacement is prone to being generated is solved.

Description

Technical Field

[0001] The invention relates to the technical field of building construction, and in particular to a double T-shaped underground continuous wall of a deep foundation pit adjacent to a subway elevated road and a deep foundation pit construction method. Background Art

[0002] In order to efficiently utilize limited space, many new buildings have to be built next to existing elevated subway lines. The environmental protection requirements for foundation pits next to elevated subway lines are high, ensuring that the normal operation and structural safety of existing subway lines are not affected, and ensuring the safety and convenience of the surrounding environment and residents' lives. For example, one side of a project is adjacent to the elevated subway line, and the minimum distance from the foundation pit is 23m. If conventional ground-connected walls are used, horizontal displacement is likely to occur during the construction of the new foundation pit, which will affect the structural safety of the existing elevated subway line.

[0003] The information disclosed in this background technology section is only intended to enhance the understanding of the overall background of the invention and should not be regarded as an acknowledgment or any form of suggestion that the information constitutes the prior art already known to a person skilled in the art. Summary of the invention

[0004] In order to overcome the defects of the prior art, a double T-shaped underground continuous wall and a deep foundation pit construction method for a deep foundation pit adjacent to a subway elevated road are provided to solve the problem that the traditional ground-connected wall is used in the foundation pit construction adjacent to the existing subway elevated road, which is prone to horizontal displacement and affects the structural safety of the existing subway elevated road.

[0005] To achieve the above object, a double T-shaped underground continuous wall for a deep foundation pit adjacent to a subway elevated road is provided, comprising a plurality of ground-connected wall units continuously arranged along the circumferential direction of the foundation pit, wherein the ground-connected wall units include:

[0006] An exterior wall panel having two opposite adjacent ends, wherein the adjacent ends are connected to adjacent ends of exterior wall panels of adjacent ground-connected wall units;

[0007] An inner wall panel, the inner wall panel is arranged opposite to the outer wall panel, and the length of the inner wall panel is shorter than the length of the outer wall panel;

[0008] The supporting wall panel is arranged between the outer wall panel and the inner wall panel, and two ends of the supporting wall panel are respectively supported and connected to the outer wall panel and the inner wall panel.

[0009] Furthermore, the supporting wall panel includes a thick wall section and a thin wall section, one end of the thick wall section is connected to the inner side of the outer wall panel, and the thin wall section is connected to the other end of the thick wall section and the inner side of the inner wall panel.

[0010] Furthermore, the parts of the multiple ground-anchored wall units located within the earth excavation range of the foundation pit are plain concrete structures, and the remaining parts of the multiple ground-anchored wall units located outside the earth excavation range of the foundation pit are reinforced concrete structures.

[0011] Furthermore, the length of the inner wall panel is half of the length of the outer wall panel.

[0012] The present invention provides a deep foundation pit construction method using a deep foundation pit double T-shaped underground continuous wall adjacent to a subway elevated frame, comprising the following steps:

[0013] Constructing a double T-shaped underground continuous wall of the deep foundation pit adjacent to the subway elevated road, so that the inner wall panels of multiple ground-connected wall units of the double T-shaped underground continuous wall of the deep foundation pit adjacent to the subway elevated road are arranged on the inner side of the deep foundation pit;

[0014] Excavating the earthwork of the deep foundation pit and constructing internal supports;

[0015] After the inner support is constructed, the parts of the plurality of ground-connected wall units located within the earth excavation range of the foundation pit are removed, and the remaining parts of the plurality of ground-connected wall units are used as buttresses in the deep foundation pit during the subsequent underground structure construction;

[0016] A bottom plate is constructed at the bottom of the deep foundation pit, and the bottom plate is connected to the portions of the plurality of ground-connected wall units located below the bottom of the deep foundation pit.

[0017] The beneficial effect of the present invention is that one side of the deep foundation pit of the double T-shaped underground continuous wall of the deep foundation pit adjacent to the subway elevated of the present invention is adjacent to the subway 7 or elevated, and adopts an inner and outer double T-shaped underground continuous wall structure, which greatly enhances the rigidity of the underground continuous wall, reduces the horizontal displacement caused by the foundation pit construction, and reduces the impact of the foundation pit construction on the subway elevated. In the process of earth excavation, the double T-shaped underground continuous wall of the deep foundation pit adjacent to the subway elevated of the present invention first excavates the earth area, and after the support construction is completed, the T-shaped reinforced underground continuous wall in the pit is broken to reduce the deformation generated during the earth excavation process. Within the earth excavation height range, the T-shaped reinforced underground continuous wall in the pit is reinforced with plain concrete or cement soil, which reduces the amount of demolition construction during the earth excavation construction process and facilitates the earth excavation construction in the pit. In the deep foundation pit of the double T-shaped underground continuous wall adjacent to the subway elevated of the present invention, when the underground structure is constructed, the outer T-shaped retaining ground wall is retained and used as a buttress column in the pit to reduce the amount of engineering during the structural construction process. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Other features, objects and advantages of the present application will become more apparent by reading the detailed description of non-limiting embodiments made with reference to the following drawings:

[0019] Figure 1It is a schematic structural diagram of a double T-shaped underground continuous wall of a deep foundation pit adjacent to a subway elevated road according to an embodiment of the present invention.

[0020] Figure 2 for Figure 1 A local enlarged schematic diagram of point B in FIG.

[0021] Figure 3 Schematic diagram of the structure of the ground-connected wall unit according to an embodiment of the present invention.

[0022] Figure 4 Schematic diagram of the structure of the ground-connected wall unit according to an embodiment of the present invention. DETAILED DESCRIPTION

[0023] The present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the relevant invention, rather than to limit the invention. It is also necessary to explain that, for ease of description, only the parts related to the invention are shown in the accompanying drawings.

[0024] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0025] Reference Figures 1 to 4 As shown, the present invention provides a double T-shaped underground continuous wall for a deep foundation pit adjacent to a subway elevated road, comprising a plurality of ground-connected wall units A continuously arranged along the circumferential direction of the foundation pit.

[0026] Ground-connected wall unit A includes:

[0027] The outer wall panel 1 is arranged along the circumferential direction of the deep foundation pit. The outer wall panel 1 has two opposite adjacent ends. The adjacent ends are connected to the adjacent ends of the outer wall panel 1 of the adjacent ground wall unit A.

[0028] The inner wall panel 2 is arranged along the circumferential direction of the deep foundation pit. The inner wall panel and the outer wall panel are arranged in the same direction. The inner wall panel 2 is arranged opposite to the outer wall panel 1. The length of the inner wall panel 2 is less than the length of the outer wall panel 1.

[0029] As a preferred implementation, the length of the inner wall panel 2 is half the length of the outer wall panel 1 .

[0030] The supporting wall panel 3 is arranged between the outer wall panel 1 and the inner wall panel 2. Two ends of the supporting wall panel 3 are supported and connected to the outer wall panel 1 and the inner wall panel 2 respectively.

[0031] As a preferred embodiment, the supporting wall panel 3 includes a thick wall section 31 and a thin wall section 32. One end of the thick wall section 31 is connected to the inner side of the outer wall panel 1. The thin wall section 32 is connected to the other end of the thick wall section 31 and the inner side of the inner wall panel 2.

[0032] In this embodiment, the portion of the multiple ground-connected wall units A located within the earth excavation range of the foundation pit is a plain concrete structure, and the remaining portion of the multiple ground-connected wall units A located outside the earth excavation range of the foundation pit is a reinforced concrete structure.

[0033] The present invention provides a deep foundation pit construction method using a deep foundation pit double T-shaped underground continuous wall adjacent to a subway elevated frame, comprising the following steps:

[0034] S1. Construct a double T-shaped underground continuous wall of a deep foundation pit adjacent to a subway elevated road, so that the inner wall panels 2 of multiple ground-connected wall units A of the double T-shaped underground continuous wall of the deep foundation pit adjacent to the subway elevated road are arranged on the inner side of the deep foundation pit.

[0035] S2. Excavate the deep foundation pit and construct internal supports 4.

[0036] S3. After the construction of the inner support 4, the parts of the multiple ground-connected wall units A located within the earth excavation range of the foundation pit are removed, and the remaining parts of the multiple ground-connected wall units A are used as buttresses in the deep foundation pit during the subsequent construction of the underground structure 6.

[0037] S4. Construct a bottom plate 5 at the bottom of the deep foundation pit, and connect the bottom plate 5 to the parts of the plurality of ground-connected wall units A located below the bottom of the deep foundation pit.

[0038] One side of the deep foundation pit of the double T-shaped underground continuous wall adjacent to the subway elevated road of the present invention is adjacent to the subway 7 or elevated road, and an inner and outer double T-shaped underground continuous wall structure is adopted to greatly enhance the rigidity of the underground continuous wall, reduce the horizontal displacement caused by the foundation pit construction, and reduce the impact of the foundation pit construction on the subway elevated road.

[0039] The double T-shaped underground continuous wall of the deep foundation pit adjacent to the subway elevated road of the present invention has reinforced concrete in the part below the foundation bottom plate, which is more advantageous than the cross-section of the conventional underground continuous wall and can effectively reduce the deep displacement of the soil and reduce the impact on the subway elevated road.

[0040] The double T-shaped underground continuous wall of the deep foundation pit adjacent to the subway elevated of the present invention first excavates the earthwork area during the earthwork excavation process, and then breaks the T-shaped reinforced underground continuous wall in the pit after the support construction is completed, thereby reducing the deformation generated during the earthwork excavation process. Within the earthwork excavation height range, the T-shaped reinforced underground continuous wall in the pit is reinforced with plain concrete or cement soil, thereby reducing the amount of breaking construction work during the earthwork excavation construction process, and facilitating the earthwork excavation construction in the pit.

[0041] The double T-shaped underground continuous wall of the deep foundation pit adjacent to the subway elevated road of the present invention retains the outer T-shaped retaining ground wall during the underground structure construction and is used as a buttress column in the pit, thereby reducing the engineering workload during the structure construction process.

[0042] The double T-shaped underground continuous wall of the deep foundation pit adjacent to the subway elevated road of the present invention is mainly supported by reinforced concrete and supplemented by a servo support system, which limits and compensates the horizontal displacement of the double T-shaped underground continuous wall and soil, and further reduces the impact on the subway elevated road.

[0043] In this embodiment, each of the outer retaining underground continuous walls of the deep foundation pit adopts a T-shaped ground wall, which is a reinforced ground wall according to the design requirements.

[0044] The T-shaped reinforced ground wall in the pit is used inside the enclosure. Within the earth excavation height range, the T-shaped underground continuous wall is reinforced with plain concrete or cement soil to facilitate the earth excavation construction in the pit. The T-shaped reinforced ground wall in the pit below the bottom plate is reinforced with a reinforced ground wall.

[0045] During the earth excavation process, the earth area is excavated first. After the support construction is completed, the T-shaped reinforced underground continuous wall in the plain concrete or cement soil area in the pit is broken to reduce the deformation caused during the earth excavation process.

[0046] During the support construction, reinforced concrete support is mainly used and servo support system is used as a supplement to limit and compensate the horizontal displacement of the double T-shaped underground continuous wall and soil.

[0047] During the bottom plate construction, the portion of the T-shaped reinforced ground wall in the pit below the bottom plate is connected to the bottom plate.

[0048] During the construction of underground structures, the outer T-shaped retaining wall is retained and used as buttresses in the pit.

[0049] The above description is only a preferred embodiment of the present application and an explanation of the technical principles used. Those skilled in the art should understand that the scope of the invention involved in the present application is not limited to the technical solution formed by a specific combination of the above technical features, but should also cover other technical solutions formed by any combination of the above technical features or their equivalent features without departing from the inventive concept. For example, the above features are replaced with (but not limited to) technical features with similar functions disclosed in the present application.

Claims

1. A double T-shaped underground continuous wall for a deep foundation pit adjacent to a subway elevated road, characterized in that: It comprises a plurality of ground-connected wall units which are continuously arranged along the circumferential direction of the foundation pit, and the ground-connected wall units comprise: An exterior wall panel having two opposite adjacent ends, wherein the adjacent ends are connected to adjacent ends of exterior wall panels of adjacent ground-connected wall units; An inner wall panel, the inner wall panel is arranged opposite to the outer wall panel, and the length of the inner wall panel is shorter than the length of the outer wall panel; The supporting wall panel is arranged between the outer wall panel and the inner wall panel, and two ends of the supporting wall panel are respectively supported and connected to the outer wall panel and the inner wall panel.

2. The double T-shaped underground continuous wall of a deep foundation pit adjacent to a subway elevated road according to claim 1, characterized in that: The supporting wall panel comprises a thick wall section and a thin wall section, one end of the thick wall section is connected to the inner side of the outer wall panel, and the thin wall section is connected to the other end of the thick wall section and the inner side of the inner wall panel.

3. The double T-shaped underground continuous wall of a deep foundation pit adjacent to a subway elevated road according to claim 1, characterized in that: The parts of the multiple ground-anchored wall units located within the earth excavation range of the foundation pit are plain concrete structures, and the remaining parts of the multiple ground-anchored wall units located outside the earth excavation range of the foundation pit are reinforced concrete structures.

4. The double T-shaped underground continuous wall of a deep foundation pit adjacent to a subway elevated road according to claim 1, characterized in that: The length of the inner wall panel is half of the length of the outer wall panel.

5. A deep foundation pit construction method using the double T-shaped underground continuous wall of a deep foundation pit adjacent to a subway elevated road as claimed in any one of claims 1 to 4, characterized in that: The following steps are involved: Constructing a double T-shaped underground continuous wall of the deep foundation pit adjacent to the subway elevated road, so that the inner wall panels of multiple ground-connected wall units of the double T-shaped underground continuous wall of the deep foundation pit adjacent to the subway elevated road are arranged on the inner side of the deep foundation pit; Excavating the earthwork of the deep foundation pit and constructing internal supports; After the inner support is constructed, the parts of the plurality of ground-connected wall units located within the earth excavation range of the foundation pit are removed, and the remaining parts of the plurality of ground-connected wall units are used as buttresses in the deep foundation pit during the subsequent underground structure construction; A bottom plate is constructed at the bottom of the deep foundation pit, and the bottom plate is connected to the portions of the plurality of ground-connected wall units located below the bottom of the deep foundation pit.

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