Supporting structure of subway main body foundation pit without crown beam and auxiliary foundation pit node

Abstract

The utility model provides a supporting structure for a joint of a subway main body foundation pit and an auxiliary foundation pit when no crown beam exists. The supporting structure comprises an enclosure structure, a main body top plate arranged in the main body foundation pit and a first support arranged in the auxiliary foundation pit. The main body top plate is connected with the side wall of the enclosure structure; the first support is connected with the top of the enclosure structure; wherein a force transmission structure is arranged between the first support and the main body top plate, and the force transmission structure is used for transmitting the acting force of the first support to the main body top plate; the force transmission structure comprises a stress component, and at least part of the stress component is located in the main body top plate. According to the supporting structure of the subway main body foundation pit and the auxiliary foundation pit joint when no crown beam exists, the force transmission structure is arranged, the first support is connected with the main body top plate through the force transmission structure, the force transmission structure acts between the main body top plate and the auxiliary top plate, the technology is simple, and the construction efficiency is high.

Description

Technical Field

[0001] This application relates to the technical field of underground structure engineering, and particularly to a support structure for the node between the main foundation pit of a subway without a capping beam and the auxiliary foundation pit. Background Art

[0002] With the continuous development of the economy and the limited urban underground space, in order to make full use of the underground space to construct underground structures such as subway stations, it is necessary to excavate foundation pits to accommodate the construction of underground structures.

[0003] The subway station mainly includes a main foundation pit, an auxiliary foundation pit and a retaining structure. The retaining structure is arranged between the main foundation pit and the auxiliary foundation pit, and the main foundation pit and the auxiliary foundation pit share the retaining structure. Among them, the main foundation pit includes a capping beam and a main roof slab, the auxiliary foundation pit includes a first support and an auxiliary roof slab, the retaining structure includes a diaphragm wall, the capping beam is connected to the top of the diaphragm wall, the diaphragm wall is used to bear the load of the capping beam, the main roof slab is connected to the auxiliary roof slab, the main roof slab is connected to the side wall of the diaphragm wall, and part of the load of the main roof slab can be effectively transmitted to the diaphragm wall. The first support is supported on the capping beam, and the first support transmits the load of the upper structure to the diaphragm wall through the capping beam.

[0004] However, in the construction structure of the main foundation pit, due to reasons such as municipal roads and pipelines, the capping beam in the main foundation pit of the station needs to be chiseled off in advance. In this case, it is no longer possible to transmit the acting force to the first support through the capping beam in the support structure at the node between the main foundation pit of the subway without a capping beam and the auxiliary foundation pit; moreover, the process is complex, the construction efficiency is low, a post-cast strip needs to be set, and there are potential safety hazards.

[0005] Therefore, there is room for further improvement in the existing support structure. Summary of the Utility Model

[0006] In view of the above, in the support structure for the foundation pit of the subway station in the prior art, due to the need to chisel off the capping beam in advance, the capping beam cannot transmit the acting force to the first support, which will increase the subsequent treatment process and potential safety hazards. This application provides a support structure for the node between the main foundation pit of the subway without a capping beam and the auxiliary foundation pit, which is provided with a force transmission structure. The force transmission structure acts between the main roof slab and the auxiliary roof slab, and is used to transmit the acting force of the first support to the main roof slab, and there is no need to set a post-cast strip, the process is simple, and the construction efficiency is high.

[0007] To achieve the above object, this application provides the following technical solution: A support structure for the node between the main foundation pit of the subway without a capping beam and the auxiliary foundation pit, including a retaining structure, a main roof slab arranged in the main foundation pit, and a first support arranged in the auxiliary foundation pit;

[0008] The main body top plate is connected to the side wall of the retaining structure, and the first support is connected to the top of the retaining structure;

[0009] Wherein, a force transmission structure is provided between the first support and the main body top plate, and the force transmission structure is used to transmit the acting force of the first support to the main body top plate;

[0010] Wherein, the force transmission structure includes a force-bearing member, the force-bearing member is connected to the main body top plate, and at least part of the force-bearing member is located within the main body top plate.

[0011] Compared with the prior art, the supporting structure of the node between the subway main body foundation pit without a capping beam and the accessory foundation pit in this application lies in setting a force transmission structure. The force transmission structure is arranged between the first support and the main body top plate, and the force transmission structure is used to transmit the acting force of the first support to the main body top plate. Wherein, the force transmission structure includes a force-bearing member, at least part of the force-bearing member is located within the main body top plate, and the force-bearing member is used to connect the main body top plate and the force transmission structure together. Therefore, the force transmission structure in this application can play a role in transmitting the acting force. Through the force transmission structure, the main body top plate and the first support are connected together, which can effectively increase the bearing capacity of the first support and the main body top plate, enabling them to bear greater loads, preventing the first support and the main body top plate from tilting or losing stability under the action of external loads, and there is no need to set a post-cast strip, the process is simple and the construction efficiency is high.

[0012] Further, one end of the force transmission structure is connected to the top of the main body top plate, and the other end is connected to the end of the first support;

[0013] At least part of the force transmission structure is located within the main body top plate.

[0014] Further, the force transmission structure further includes a flexural member, the flexural member is connected to the main body top plate, at least part of the flexural member is located within the main body top plate, and the flexural member is used to reinforce the connection between the main body top plate and the force transmission structure.

[0015] Further, the force-bearing member includes a first fixing member and a second fixing member;

[0016] One end of the first fixing member is connected to the second fixing member, and the other end extends towards the main body top plate and is inserted into the main body top plate;

[0017] Wherein, the connection angle between the first fixing member and the second fixing member is an obtuse angle.

[0018] Further, the force-bearing member further includes a third fixing member and a fourth fixing member;

[0019] One end of the second fixing member away from the first fixing member is perpendicularly connected to the third fixing member, and the other end of the third fixing member is perpendicularly connected to the fourth fixing member;

[0020] At least a part of the third fixing member is located within the main body top plate, and the fourth fixing member is located within the main body top plate.

[0021] Furthermore, the flexural member includes a first connecting member and a second connecting member;

[0022] One end of the first connecting member is connected to the second connecting member, and the other end extends towards the direction of the main body top plate and is inserted into the main body top plate;

[0023] Wherein, the connection angle between the first connecting member and the second connecting member is θ, where 30° < θ < 180°.

[0024] Furthermore, the flexural member further includes a third connecting member and a fourth connecting member;

[0025] One end of the second connecting member away from the first connecting member is connected to the third connecting member, and the other end of the third connecting member is perpendicularly connected to the fourth connecting member;

[0026] At least a part of the third connecting member is located within the main body top plate, and the fourth connecting member is located within the main body top plate.

[0027] Furthermore, the connection angle between the second connecting member and the third connecting member is α;

[0028] Wherein, 90° ≤ α < 180°.

[0029] Furthermore, the first connecting member is arranged obliquely downward, the second connecting member is arranged obliquely upward, the third connecting member is arranged vertically, and the fourth connecting member is arranged horizontally.

[0030] Furthermore, a steel bar coupler is fixedly arranged at the connection between the force transmission structure and the first support, and one end of the steel bar in the force transmission structure is connected to the first support through the steel bar coupler.

[0031] The support structure of the subway main body foundation pit without a capping beam and the node of the affiliated foundation pit of the present application has at least the following technical effects:

[0032] 1. By providing a flexural member, the flexural member is connected to the main body top plate, at least a part of the flexural member is located within the main body top plate, and the force-bearing member is located outside the flexural member. The flexural member can connect the force transmission structure and the main body top plate together, effectively strengthening the main body top plate and the force transmission structure, increasing the bearing capacity between the main body top plate and the force transmission structure, and improving the bearing capacity of the overall structure by bearing part of the load.

[0033] 2. By setting up steel bar couplers, the steel bar couplers are fixedly arranged at the connection between the force transfer structure and the first support. One end of the steel bar in the force transfer structure is connected to the first support through the steel bar coupler. Since the length of the steel bar is limited, the steel bar coupler can connect two steel bars together, ensuring the reliability of the connection. Moreover, the steel bar coupler can simplify the construction process, improve the connection efficiency and quality, and also contribute to ensuring the integrity and safety of the force transfer structure and the first support. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 is the structural plan view of the support structure of the node between the subway main foundation pit without a capping beam and the auxiliary foundation pit provided by an embodiment of the present application;

[0035] Figure 2 is the structural schematic diagram of the force transfer structure of the support structure of the node between the subway main foundation pit without a capping beam and the auxiliary foundation pit provided by an embodiment of the present application Figure 1 ;

[0036] Figure 3 is Figure 2 the sectional view taken along line A - A in

[0037] Figure 4 is the structural schematic diagram of the force transfer structure of the support structure of the node between the subway main foundation pit without a capping beam and the auxiliary foundation pit provided by an embodiment of the present application Figure 2 ;

[0038] Figure 5 is the structural schematic diagram of the flexural member of the support structure of the node between the subway main foundation pit without a capping beam and the auxiliary foundation pit provided by an embodiment of the present application;

[0039] Figure 6 is the structural schematic diagram of the force - bearing member of the support structure of the node between the subway main foundation pit without a capping beam and the auxiliary foundation pit provided by an embodiment of the present application.

[0040] Reference Numerals:

[0041] 1. First support; 2. Enclosure structure; 3. Main body roof slab; 4. Force transfer structure;

[0042] 41. Force - bearing member; 42. Flexural member; 44. First support member; 45. Steel bar coupler; 46. Stirrup; 47. Second support member; 48. Shear failure line;

[0043] 411. First fixing member; 412. Second fixing member; 413. Third fixing member; 414. Fourth fixing member;

[0044] 421, First connecting piece; 422, Second connecting piece; 423, Third connecting piece; 424, Fourth connecting piece; 471, First rod; 472, Second rod. Detailed implementation manners

[0045] To enable those skilled in the art to better understand the technical solutions of the present disclosure, the present disclosure will be described in detail, clearly and completely below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present disclosure and are not used to limit the present disclosure.

[0046] In the description of the present application, if the first and second are described, it is only for the purpose of distinguishing technical features and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence of the indicated technical features.

[0047] Those skilled in the art should understand that in the disclosure of the present application, the orientation or positional relationship indicated by terms such as "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the accompanying drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the indicated device or element must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limiting the present application.

[0048] The following will further describe the present application in detail with reference to the accompanying drawings. See Figures 1 to 6 Description.

[0049] The support structure of the node between the main subway foundation pit without a coping beam and the auxiliary foundation pit provided in this embodiment is applied in the technical field of underground structure engineering, such as Figures 1 to 6As shown in the figure, it includes a retaining structure 2. Part of the retaining structure 2 is used to support the main foundation pit, and part of the retaining structure 2 is used to support the auxiliary foundation pit. The retaining structure 2 is arranged between the main foundation pit and the auxiliary foundation pit, and the main foundation pit and the auxiliary foundation pit share the retaining structure 2. The main top plate 3 is arranged in the main foundation pit, and the first support 1 is arranged in the auxiliary foundation pit. The first support 1 is a concrete support, and the first support 1 is made of steel bars and cast concrete. The retaining structure 2 is a wall structure. The first support 1 is connected to the top of the retaining structure 2, and the main top plate 3 is connected to the side wall of the retaining structure 2. The first support 1 is arranged below the retaining structure 2. The main top plate 3 is horizontally arranged. The first support 1 and the retaining structure 2 are arranged in the foundation pit. The first support 1 can be used to support the soil and rock around the auxiliary foundation pit, prevent the wall surface of the auxiliary foundation pit from collapsing, ensure the safety and stability of the auxiliary foundation pit, and can also create a safe and stable construction space, provide a necessary working space for construction personnel and equipment, and ensure the smooth progress of construction. The main top plate 3 can be used as a working platform for construction personnel and equipment, facilitate construction operations and the entry and exit of equipment from the foundation pit, and can also effectively restrain the soil around the main foundation pit, prevent the soil from collapsing or landsliding, and maintain the stability of the main foundation pit.

[0050] As Figures 1 to 2 shown in the figure, there is a force transfer structure 4 between the first support 1 and the main top plate 3. One end of the force transfer structure 4 is connected to the end of the first support 1, and one end is connected to the top of the main top plate 3. The force transfer structure 4 is a concrete corbel structure. The force transfer structure 4 rigidly connects the first support 1 and the main top plate 3. The force transfer structure 4 is used to transfer the acting force of the first support 1 to the main top plate 3. The first support 1 is supported on the capping beam. When the capping beam in the main foundation pit needs to be chiseled off in advance, the chiseled capping beam does not have the ability to transfer the acting force to the first support 1. By setting the force transfer structure 4, the force transfer structure 4 can transfer the acting force of the first support 1 to the main top plate 3, which can effectively increase the bearing capacity of the first support 1 and the main top plate 3, prevent the first support 1 and the main top plate 3 from tilting or losing stability under the action of external loads, and there is no need to set a post-cast strip, the process is simple and the construction efficiency is high.

[0051] Specifically, as Figures 2 to 3As shown, the force transmission structure 4 includes a force-bearing member 41, a flexural member 42, and stirrups 46. The force-bearing member 41 is a tension reinforcement bar, and the flexural member 42 is a bent-up reinforcement bar. The force-bearing member 41 is connected to the main body roof slab 3, and at least part of the force-bearing member 41 is located within the main body roof slab 3. There are multiple force-bearing members 41, and there is a certain distance between the multiple force-bearing members 41, which is designed according to the actual on-site situation. Concrete is poured and connected to the force-bearing member 41 for strengthening the connection between the main body roof slab 3 and the force transmission structure 4. There are multiple flexural members 42, and the multiple flexural members 42 are arranged inside the force-bearing member 41. There is a certain distance between two adjacent flexural members 42, which is designed according to the actual on-site situation. The flexural member 42 is connected to the main body roof slab 3, and at least part of the flexural member 42 is located within the main body roof slab 3. The force-bearing member 41 and the flexural member 42 can connect the force transmission structure 4 and the main body roof slab 3 together. Then, concrete is poured and fixed to the flexural member 42, which can effectively strengthen the connection between the main body roof slab 3 and the force transmission structure 4, increase the bearing capacity between the main body roof slab 3 and the force transmission structure 4, and improve the bearing capacity of the overall structure by bearing part of the load. There are multiple stirrups 46, and two adjacent stirrups 46 are arranged at intervals. The stirrup 46 is connected to the main body roof slab 3, and at least part of the stirrup 46 is located within the main body roof slab 3. The stirrup 46 surrounds the force-bearing member 41 and the flexural member 42. Both the force-bearing member 41 and the flexural member 42 are arranged inside the stirrup 46. The stirrup 46 and the fixed force-bearing member 41 and flexural member 42 are fixed together by binding. Then, concrete is poured and formwork is fixed. After the concrete hardens and takes shape, the formwork is removed. A good bond strength is established between the concrete and the force-bearing member 41, the flexural member 42, and the stirrup 46, which can jointly bear the external pressure, thereby improving the bearing capacity of the force transmission structure 4 and extending the durability of the force transmission structure 4.

[0052] Further, as Figures 4 to 5As shown in the figure, the force-bearing member 41 includes a first fixing member 411, a second fixing member 412, a third fixing member 413, and a fourth fixing member 414. The first fixing member 411 is a steel bar, the second fixing member 412 is a steel bar, the third fixing member 413 is a steel bar, and the fourth fixing member 414 is a steel bar. One end of the first fixing member 411 is connected to the second fixing member 412, and the other end extends towards the main body roof 3 and is inserted into the main body roof 3. The first fixing member 411 is arranged obliquely downward, and the second fixing member 412 is arranged horizontally. The connection angle between the first fixing member 411 and the second fixing member 412 is an obtuse angle. The end of the second fixing member 412 away from the first fixing member 411 is perpendicularly connected to the third fixing member 413, and the other end of the third fixing member 413 is perpendicularly connected to the fourth fixing member 414, that is, the connection angle between the second fixing member 412 and the third fixing member 413 is 90°, and the connection angle between the third fixing member 413 and the fourth fixing member 414 is 90°. At least part of the third fixing member 413 is located in the main body roof 3. The third fixing member 413 is arranged on the side close to the first support 1. The fourth fixing member 414 is located in the main body roof 3, and the fourth fixing member 414 extends towards the direction away from the first support 1 of the third fixing member 413. When the length of the shear failure line 48 of the force transmission structure 4 is L, the length of the second fixing member 412 should be controlled between L / 3 and L / 6 and not exceed L / 2, which can effectively reduce the influence of stress change and stress concentration, improve the bending performance of the force-bearing member 41, and reduce the construction difficulty.

[0053] Furthermore, as Figures 4 to 6As shown in the figure, the flexural member 42 includes a first connecting member 421, a second connecting member 422, a third connecting member 423, and a fourth connecting member 424. The first connecting member 421 is a steel bar, the second connecting member 422 is a steel bar, the third connecting member 423 is a steel bar, and the fourth connecting member 424 is a steel bar. One end of the first connecting member 421 is connected to the second connecting member 422, and the other end extends towards the main body top plate 3 and is inserted into the main body top plate 3. The first connecting member 421 is arranged obliquely downwards, and the second connecting member 422 is arranged obliquely upwards. The angle at the connection between the first connecting member 421 and the second connecting member 422 is θ, where 30° ≤ θ < 180°. One end of the second connecting member 422 away from the first connecting member 421 is connected to the third connecting member 423, and the connection angle between the second connecting member 422 and the third connecting member 423 is α, where 90° ≤ α < 180°. Among them, α can take 90°, 120°, 150°, and the range of α can be determined according to the structural design requirements through calculation. The other end of the third connecting member 423 is perpendicularly connected to the fourth connecting member 424, that is, the connection angle between the third connecting member 423 and the fourth connecting member 424 is 90°. At least part of the third connecting member 423 is located in the main body top plate 3, and the fourth connecting member 424 is located in the main body top plate 3. The fourth connecting member 424 extends towards the direction away from the first support 1 of the third connecting member 423. The third connecting member 423 is arranged vertically, and the fourth connecting member 424 is arranged horizontally. When the length of the shear failure line 48 of the force transmission structure 4 is L, the length of the second connecting member 422 should be controlled between L / 3 and L / 6 and not exceed L / 2, which can effectively reduce the influence of stress change and stress concentration, improve the bending performance of the flexural member 42, and reduce the construction difficulty.

[0054] As Figure 2 shown in the figure, the force transmission structure 4 further includes a steel bar coupler 45, a first support member 44, and a second support member 47. The first support member 44 is a steel bar, and the first support member 44 is an L-shaped structure. The first support member 44 is arranged horizontally. The first support member 44 is fixedly connected to one end of the steel bar in the first support 1 through the steel bar coupler 45. The first support member 44 is arranged above the second fixing member 412. At least part of the first support member 44 and the second fixing member 412 have an intersection point, and the intersection point is fixedly connected by tying or welding to ensure the cooperative effect between the first support member 44 and the second fixing member 412, and improve the ability of the first support 1 and the force transmission structure 4 to jointly bear the load. The second support member 47 is a steel bar. The second support member 47 is fixedly connected to one end of the steel bar in the first support through the steel bar coupler 45. The second support member 47 is arranged horizontally, and the second support member 47 is located on the side of the first support 1 close to the main body top plate 3.

[0055] Further, the second support member 47 includes a first rod member 471 and a second rod member 472. One end of the first rod member 471 is fixedly connected to one end of the steel bar in the first support 1 through a steel bar coupler 45, and the other end is fixedly connected to the second rod member 472. The connection angle between the first rod member 471 and the second rod member 472 is an obtuse angle. The first rod member 471 is horizontally arranged, and the second rod member 472 is obliquely downward arranged. The second rod member 472 is arranged inside the flexural member 42. There is an intersection point between the first rod member 471 and the second connecting member 422, and the intersection point is fixedly connected by binding or welding to ensure the synergistic effect between the second support member 47 and the second connecting member 422, and improve the ability of the first support 1 and the force transmission structure 4 to jointly bear the load. Among them, a steel bar coupler 45 is also provided in the main body top plate 3. Since the length of the steel bars in the main body top plate 3 is limited, the steel bar coupler 45 can connect the steel bars of the main body top plate 3 and the steel bars of the inner top plate of the attached foundation pit, which can ensure the reliability of the connection. Moreover, the steel bar coupler 45 can simplify the construction process, improve the connection efficiency and quality, and also help to ensure the integrity and safety of the force transmission structure 4 and the first support 1.

[0056] The above has introduced the present application in detail. Specific examples are used in this article to elaborate on the principle and implementation manner of the present application. The description of the above embodiments is only used to help understand the present application and its core idea. It should be noted that for those of ordinary skill in the art in this technical field, without departing from the principle of the present application, several improvements and modifications can be made to the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. The supporting structure of the node between the subway main foundation pit without a top beam and the auxiliary foundation pit, characterized in that, It includes an enclosure structure (2), a main body roof slab (3) arranged in the main body foundation pit, and a first support (1) arranged in the auxiliary foundation pit; The main body roof slab (3) is connected to the side wall of the enclosure structure (2), and the first support (1) is connected to the top of the enclosure structure (2); Wherein, a force transmission structure (4) is arranged between the first support (1) and the main body roof slab (3), and the force transmission structure (4) is used to transmit the acting force of the first support (1) to the main body roof slab (3); Wherein, the force transmission structure (4) includes a force-bearing member (41), the force-bearing member (41) is connected to the main body roof slab (3), and at least part of the force-bearing member (41) is located inside the main body roof slab (3).

2. The support structure of the node between the main body foundation pit of the subway without a capping beam and the auxiliary foundation pit according to claim 1, characterized in that One end of the force transmission structure (4) is connected to the top of the main body roof slab (3), and one end is connected to the end of the first support (1); At least part of the force transmission structure (4) is located inside the main body roof slab (3).

3. The support structure of the node between the main body foundation pit of the subway without a capping beam and the auxiliary foundation pit according to claim 1, characterized in that The force transmission structure (4) further includes a bending member (42), the bending member (42) is connected to the main body roof slab (3), at least part of the bending member (42) is located inside the main body roof slab (3), and the bending member (42) is used to reinforce the main body roof slab (3) and the force transmission structure (4).

4. The support structure of the node between the main body foundation pit of the subway without a capping beam and the auxiliary foundation pit according to claim 1, characterized in that The force-bearing member (41) includes a first fixing member (411) and a second fixing member (412); One end of the first fixing member (411) is connected to the second fixing member (412), and the other end extends towards the direction of the main body roof slab (3) and is inserted into the main body roof slab (3); Wherein, the connection angle between the first fixing member (411) and the second fixing member (412) is an obtuse angle.

5. The support structure of the node between the main body foundation pit of the subway without a capping beam and the auxiliary foundation pit according to claim 4, characterized in that The force-bearing member (41) further includes a third fixing member (413) and a fourth fixing member (414); One end of the second fixing member (412) far from the first fixing member (411) is vertically connected to the third fixing member (413), and the other end of the third fixing member (413) is vertically connected to the fourth fixing member (414); At least part of the third fixing member (413) is located inside the main body roof slab (3), and the fourth fixing member (414) is located inside the main body roof slab (3).

6. The support structure of the node between the main body foundation pit of the subway without a capping beam and the auxiliary foundation pit according to claim 3, characterized in that The bending member (42) includes a first connecting member (421) and a second connecting member (422); One end of the first connecting member (421) is connected to the second connecting member (422), and the other end extends towards the direction of the main body top plate (3) and is inserted into the main body top plate (3). Wherein, the connection angle between the first connecting member (421) and the second connecting member (422) is θ, wherein 30° ≤ θ < 180°.

7. The supporting structure for the node between the main subway foundation pit without a capping beam and the attached foundation pit according to claim 6, characterized in that The flexural member (42) further includes a third connecting member (423) and a fourth connecting member (424); One end of the second connecting member (422) away from the first connecting member (421) is connected to the third connecting member (423), and the other end of the third connecting member (423) is vertically connected to the fourth connecting member (424); At least a part of the third connecting member (423) is located in the main body top plate (3), and the fourth connecting member (424) is located in the main body top plate (3).

8. The supporting structure for the node between the main subway foundation pit without a capping beam and the attached foundation pit according to claim 7, characterized in that The connection angle between the second connecting member (422) and the third connecting member (423) is α; Wherein, 90° ≤ α < 180°.

9. The supporting structure for the node between the main subway foundation pit without a capping beam and the attached foundation pit according to claim 7, characterized in that The first connecting member (421) is arranged obliquely downward, the second connecting member (422) is arranged obliquely upward, the third connecting member (423) is arranged vertically, and the fourth connecting member (424) is arranged horizontally.

10. The supporting structure for the node between the main subway foundation pit without a capping beam and the attached foundation pit according to claim 1, characterized in that A steel bar coupler (45) is fixedly arranged at the connection part of the force transmission structure (4) and the first support (1), and one end of the steel bar in the force transmission structure (4) is connected to the first support (1) through the steel bar coupler (45).

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