Connecting structure for back building of large-opening auxiliary foundation pit of subway

Abstract

The connecting structure used for back building of the large-opening auxiliary foundation pit of the subway comprises an underground diaphragm wall, a flat plate piece and a supporting beam, the flat plate piece and the supporting beam are arranged in a main foundation pit, the flat plate piece is connected with the side wall of the underground diaphragm wall, and the supporting beam is connected with the top of the underground diaphragm wall; a connecting structure is arranged between the supporting beam and the flat plate piece, one end of the connecting structure is connected with the end of the supporting beam, the other end of the connecting structure is connected with the top of the flat plate piece, and the connecting structure is used for transmitting acting force of the supporting beam to the flat plate piece. According to the connecting structure for back building of the large-opening auxiliary foundation pit of the subway, the connecting structure is arranged and acts between the supporting beam and the flat plate piece, the stability of the supporting beam can be improved, the bearing capacity of the flat plate piece is improved, the technology is simple, and the construction efficiency is high.

Description

Technical Field

[0001] The present application relates to the technical field of underground structure engineering, and in particular to a connection structure used for backfilling of a large-open auxiliary foundation pit of a subway. Background Art

[0002] With the continuous development of the economy, urban underground space is limited. In order to make full use of underground space to build underground structures such as subway stations, foundation pit excavation is required to accommodate the construction of underground structures.

[0003] When a subway station is connected to a large open attachment, such as a wind shelter or a close-fitting long entrance and exit, the attachment pit and the main foundation pit often share a retaining structure. The retaining structure includes a ground-connected wall. Support beams and flat plates are provided in the main foundation pit. The support beams are connected to the top of the ground-connected wall, and the flat plates are connected to the side walls of the ground-connected wall. The ground-connected wall is used to bear the load of the support beams. The first concrete support in the attachment pit is supported on the support beam of the main foundation pit. The support beam is used to bear the load of the first concrete support and transfer it to the ground-connected wall. When the internal structure of the attachment pit is completed, the ground-connected wall needs to be removed to connect the main foundation pit with the attachment pit. At this time, due to the failure of the ground-connected wall, the upper support beam and the first concrete support may fail simultaneously, posing a construction risk. In common technical retaining structures, during the backbuilding stage of the attachment pit, the ground-connected wall is partially chiseled out at the flat plate elevation, and steel sections are used for temporary support or the ground-connected wall is chiseled out in small sections to reduce the probability of simultaneous failure of the upper support beam and the first concrete support.

[0004] Then, whether using steel supports for temporary support or chiseling out the ground-connected wall in small sections, the process is complicated and the construction efficiency is low; especially in chiseling out the ground-connected wall in small sections, post-casting strips need to be set up, and there are safety hazards.

[0005] Therefore, the foundation pit retaining structure in the prior art has room for further improvement. Utility Model Content

[0006] In view of this, in order to solve the technical problems that in the existing foundation pit retaining structure, steel support is used for temporary support or the ground connection wall is removed in small sections and sections, which are complicated processes and have low construction efficiency, the present application provides a connection structure for the backbuilding of a large-opening auxiliary foundation pit of a subway. The connection structure is provided with a connection structure, which acts between the support beam and the flat plate member. The connection structure is used to transfer the force of the support beam to the flat plate member, and there is no need to set a post-casting strip or a temporary support to support the flat plate member. The process is simple and the construction efficiency is high.

[0007] To achieve the above objectives, the present application provides the following technical solutions: a connection structure for backfilling a large-opening auxiliary foundation pit of a subway, comprising a ground-connected wall, a flat plate disposed within the main foundation pit, and a support beam, wherein the flat plate is connected to the side wall of the ground-connected wall, and the support beam is connected to the top of the ground-connected wall;

[0008] A connecting structure is provided between the support beam and the flat plate member, one end of the connecting structure is connected to the side end of the support beam, and the other end is connected to the top of the flat plate member. The connecting structure is used to transmit the force of the support beam to the flat plate member.

[0009] Compared to the prior art, the connection structure used in the backfill of a large-opening auxiliary foundation pit in this application is characterized by the provision of a connecting member, one end of which is connected to the end of the support beam and the other end is connected to the top of the flat plate. The connecting structure is used to transmit the force applied by the support beam to the flat plate. Therefore, the connecting member of this application can play the role of transmitting the applied force. By connecting the flat plate to the support beam through the connecting member, the bearing capacity of the support beam and the flat plate can be effectively increased, enabling them to withstand greater loads. There is no need to set up a post-casting strip or temporary support to support the flat plate. The process is simple and the construction efficiency is high.

[0010] Furthermore, the connecting structure includes a first connecting portion and a second connecting portion, wherein the first connecting portion extends toward the support beam and is inserted into the support beam;

[0011] The second connecting portion extends toward the flat plate and is inserted into the flat plate;

[0012] Wherein, the extending directions of the first connecting portion and the second connecting portion are perpendicular to each other.

[0013] Furthermore, the connection structure further comprises a supporting member, one end of the supporting member is connected to the supporting beam, and the other end is connected to the flat plate;

[0014] The supporting member is at least partially located in the supporting beam, and the supporting member is used to connect the supporting beam and the flat plate member.

[0015] Furthermore, the supporting member includes a first supporting member and a second supporting member, the first supporting member is connected to the second supporting member, and the first supporting member is arranged obliquely downward;

[0016] The second support member extends toward the support beam and is inserted into the support beam;

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

[0018] Furthermore, a third support member is provided at one end of the first support member away from the second support member, the third support member is connected to the first support member, the third support member extends toward the flat member, and is inserted into the flat member;

[0019] Wherein, the connection angle between the second support member and the third support member is an obtuse angle.

[0020] In an embodiment of the present application, an upturned beam is provided between the ground connection wall and the flat plate member, one side of the upturned beam is connected to the ground connection wall, and the other side is connected to the flat plate member;

[0021] The top of the upward-turned beam is connected to the connecting structure, and the upward-turned beam is used to support the connecting structure.

[0022] Furthermore, the connection structure further includes a first reinforcing rib, which extends toward the ground connection wall and is inserted into the ground connection wall;

[0023] The first reinforcing ribs are arranged horizontally, and are used to reinforce the connection structure.

[0024] Furthermore, the connection structure further includes a second reinforcing rib, which extends toward the upward-flipped beam and is inserted into the upward-flipped beam;

[0025] Wherein, the extending directions of the first reinforcing rib and the second reinforcing rib are perpendicular to each other.

[0026] Furthermore, the connection structure further includes a first fixing member and a second fixing member, wherein the first fixing member is disposed around the first connecting portion, and the first connecting portion is fixed in the first fixing member;

[0027] The second fixing member is disposed around the second connecting portion, and the second connecting portion is fixed in the second fixing member.

[0028] Furthermore, there are multiple connecting structures, and there is a distance between two adjacent connecting structures;

[0029] Wherein, the two connection structures correspond to one ground-connected wall.

[0030] The present invention provides a connection structure for backfilling a large-open auxiliary foundation pit of a subway, which has at least the following technical effects:

[0031] 1. By setting a supporting member, the supporting member is at least partially connected to the supporting beam, and the supporting member is at least partially connected to the flat member. The supporting member is used to connect the supporting beam and the flat member. After pouring concrete and waiting for the concrete to harden, the supporting member can be fixed to reduce the bending and deformation of the supporting member. The concrete and the supporting member establish good bonding strength, can jointly bear external pressure, improve the bearing capacity of the connection structure, and extend the durability of the connection structure.

[0032] 2. By setting the first reinforcement rib and the second reinforcement rib, the first reinforcement rib is at least partially connected to the ground-connected wall, and the first reinforcement rib is set between the support beam and the upper flip beam; the second reinforcement rib is at least partially connected to the upper flip beam, and the second reinforcement rib is set vertically. The first reinforcement rib and the second reinforcement rib can increase the bearing capacity of the connection structure, and effectively share the load when subjected to stress by reinforcing and constraining the concrete, thereby improving the crack resistance and durability of the connection structure, and can also increase the overall stiffness of the connection structure, improve the stability and deformation resistance of the connection structure, and ensure that the connection structure will not be excessively deformed when subjected to stress. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 This is a structural elevation diagram of a connection structure for backfilling a large-open auxiliary foundation pit for a subway, provided in one embodiment of the present application;

[0034] Figure 2 This is a structural drawing of a connection structure for backfilling a large-open auxiliary foundation pit for a subway, provided in one embodiment of the present application;

[0035] Figure 3 This is a structural diagram of the supporting components of the connection structure for backbuilding of a large-open auxiliary foundation pit for a subway, provided in one embodiment of the present application.

[0036] Reference numerals:

[0037] 1. Support beam; 2. Ground-connected wall; 3. Connection structure; 4. Flat plate; 5. Upturned beam;

[0038] 31. Support member; 34. First reinforcing rib; 35. Second reinforcing rib; 36. First connecting portion; 37. Second connecting portion; 38. First fixing member; 39. Second fixing member;

[0039] 311. First support member; 312. Second support member; 313. Third support member. DETAILED DESCRIPTION

[0040] In order to enable those skilled in the art to better understand the technical solutions of the present disclosure, the present disclosure is described in detail, clearly, and completely 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 intended to limit the present disclosure.

[0041] In the description of this application, if there is a description of first or second, it is only for the purpose of distinguishing technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0042] Those skilled in the art should understand that, in the disclosure of this application, the terms "longitudinal", "transverse", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship, are based on the orientation or position relationship shown in the accompanying drawings, which 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, be constructed and operated in a specific orientation. Therefore, the above terms cannot be understood as limiting this application.

[0043] The present application will be described in further detail below with reference to the accompanying drawings. Figures 1 to 3 This embodiment provides a connection structure for the backfill of a large open auxiliary foundation pit for a subway, which is used in the field of underground structure engineering technology, such as Figures 1 to 3 As shown, it includes a ground-connected wall 2, a flat plate 4, a support beam 1 and an upturned beam 5 arranged in the main foundation pit. The support beam 1 is connected to the top of the ground-connected wall 2. The flat plate 4 is a reinforced concrete component, and the support beam 1 is a reinforced concrete component. The support beam 1 is used to bear the load of the upper structure and transfer it to the ground-connected wall 2 to ensure the stability and safety of the structure. During the foundation pit excavation process, the ground-connected wall 2 can be used as a foundation pit retaining structure. The ground-connected wall 2 can be used to support the surrounding soil and separate the main foundation pit from the auxiliary foundation pit for easy management; the upturned beam 5 is a reinforced concrete component. The soil component, one side of the upper flip beam 5 is connected to the ground-connected wall 2, and the other side of the upper flip beam 5 is connected to the flat plate 4. The bottom of the upper flip beam 5 is flush with the bottom of the flat plate 4. The upper flip beam 5 is located below the supporting beam 1. The upper flip beam 5 is a component connecting the flat plate 4 and the ground-connected wall 2. It can withstand the load transferred from the upper structure and distribute the load evenly to the ground-connected wall 2 and the flat plate 4, playing the role of bearing and transferring the load. It can also increase the stability of the overall structure, prevent the flat plate 4 from tilting or deforming when subjected to force, and ensure the safety of the flat plate 4.

[0044] Specifically, such as Figure 2When the support beam 1 is lifted up, the support beam 1 is tightened, and the support beam 1 is tightened. When the support beam 1 is lifted up, the support beam 1 is tightened, and the support beam 1 is tightened. When the support beam 1 is lifted up, the support beam 1 is tightened, and the support beam 1 is tightened. When the support beam 1 is lifted up, the support beam 1 is tightened, and the support beam 1 is tightened.

[0045] like Figures 2 to 3 As shown, the connection structure 3 includes a supporting member 31, which is a steel bar. The supporting member 31 is at least partially connected to the supporting beam 1, and the supporting member 31 is at least partially connected to the flat member 4. The supporting member 31 is arranged on the outside of the connection structure 3. The supporting member 31 is used to connect the supporting beam 1 and the flat member 4. When subjected to force, the supporting member 31 can prevent cracks or damage in the concrete, thereby improving the tensile performance and overall stability of the structure. After the concrete is poured and hardened, the supporting member 31 can be fixed to reduce the bending and deformation of the supporting member 31. The concrete and the supporting member 31 establish good bonding strength, can jointly bear external pressure, improve the bearing capacity of the connection structure 3, and extend the durability of the connection structure 3.

[0046] Further, such as Figure 3As shown, the support member 31 includes a first support member 311 and a second support member 312. The first support member 311 is connected to the second support member 312. The first support member 311 is inclined. The first support member 311 is used to reinforce the connection structure 3. The first support member 311 can also increase the bending bearing capacity of the connection structure 3. Especially when subjected to lateral loads or bending moments, the first support member 311 can effectively bear part of the load and improve the bearing capacity of the structure. The end of the second support member 312 away from the first support member 311 is connected to the support beam 1, and the second support member 312 is at least partially located in the support beam 1. The second support member 312 is arranged horizontally, and the connection angle between the first support member 311 and the second support member 312 is an obtuse angle. The second support member 312 is used to connect the support beam 1 and transfer the end load of the support beam 1 to the connecting structure 3. The end of the first support member 311 away from the second support member 312 is provided with a third support member 313. The third support member 313 is at least partially connected to the flat plate member 4. The anchorage length of the third support member 313 extending into the ground connection wall 2 is 35d (d is the diameter of the steel bar), wherein the connection angle between the third support member 313 and the second support member 312 is an obtuse angle, and the third reinforcement is used to strengthen the supporting capacity of the flat plate member 4 and improve the bearing capacity of the flat plate member 4.

[0047] Further, such as Figure 2 As shown, the connection structure 3 also includes a first reinforcement rib 34 and a second reinforcement rib 35. The first reinforcement rib 34 is at least partially connected to the ground wall 2. The first reinforcement rib 34 is arranged between the support beam 1 and the upper flip beam 5. The first reinforcement rib 34 is arranged horizontally, and the first reinforcement rib 34 extends into the ground wall 2 with an anchorage length of 35d (d is the diameter of the steel bar). The second reinforcement rib 35 is at least partially connected to the upper flip beam 5. The second reinforcement rib 35 is arranged vertically, and the second reinforcement rib 35 extends into the ground wall 2 with an anchorage length of 35d (d is the diameter of the steel bar). Among them, the intersection of the first reinforcement rib 34 and the second reinforcement rib 35 is perpendicular, and the first reinforcement rib 34 and the second reinforcement rib 35 can increase the load-bearing capacity of the connection structure 3. The ability to effectively share the load when subjected to stress by reinforcing and constraining concrete can improve the crack resistance and durability of the connection structure 3. It can also increase the overall stiffness of the connection structure 3, improve the stability and deformation resistance of the connection structure 3, and ensure that the connection structure 3 will not be excessively deformed when subjected to stress. After pouring the concrete and waiting for the concrete to harden, the first reinforcement 34 and the second reinforcement 35 can be fixed to reduce the bending and deformation of the first reinforcement 34 and the second reinforcement 35. The concrete and the first reinforcement 34 and the second reinforcement 35 establish good bonding strength and can jointly bear external pressure, thereby improving the bearing capacity of the connection structure 3 and extending the durability of the connection structure 3.

[0048] Further, such as Figure 2As shown, the connection structure 3 also includes a first connection part 36 and a second connection part 37. The first connection part 36 and the second connection part 37 are steel bars. The first connection part 36 is connected to the support beam 1. The first connection part 36 is arranged between the first support member 311 and the first reinforcement rib 34. The first connection part 36 is at least partially located in the support beam 1. There are multiple first connection parts 36, and there is a certain distance between two adjacent first connection parts 36. The distance is calculated according to the on-site conditions. The first connection part 36 is parallel to the first reinforcement rib 34. The length of the first connection part 36 extending into the support beam 1 is less than the length of the first reinforcement rib 34 extending into the ground wall 2. The first connection part 36 is mainly used to withstand the tension of the connection structure 3 under the action of load, increase the tensile bearing capacity of the connection structure 3, and prevent the concrete from cracking or damage. The first connection part 36 can also increase the bending bearing capacity, increase the rigidity and stability, prevent the connection structure 3 from excessive deformation or tilting when subjected to force, and ensure the safety of the connection structure 3. The second connection part 37 is connected to the flat member 4. The second connection part 37 is at least partially located in the flat member 4. There are multiple second connection parts 37. There is a certain distance between two adjacent second connection parts 37. The distance is calculated according to the on-site conditions. The second connection part 37 is parallel to the third support member 313. The second connection part 37 extends into the flat member 4 to effectively transfer the load on the connection structure 3 to the flat member 4, ensuring smooth transfer and distribution of the load, and also increasing the connection strength between the connection structure 3 and the flat member 4. When the ground wall 2 is removed, it can effectively prevent the flat member 4 from deformation or cracking, and improve the durability and crack resistance of the flat member 4. After pouring concrete and waiting for the concrete to harden, the first connection part 36 and the second connection part 37 can be fixed to reduce the bending and deformation of the first connection part 36 and the second connection part 37. The concrete and the first connection part 36 and the second connection part 37 establish good bonding strength, can jointly bear external pressure, improve the bearing capacity of the connection structure 3, and extend the durability of the connection structure 3.

[0049] Further, such as Figure 2As shown, the connection structure 3 further includes a first fixing member 38 and a second fixing member 39. The first fixing member 38 is a stirrup. There is at least one first fixing member 38, and a certain distance is set between two adjacent first fixing members 38. This distance is calculated based on the site conditions. The first fixing member 38 is arranged outside the first reinforcing bar 34 and the second support member 312. The first fixing member 38 can constrain the concrete, effectively preventing excessive deformation or cracking of the concrete when it is subjected to tension or compression, thereby improving the overall stability of the connection structure 3. The second fixing member 39 is a stirrup. There are multiple second fixing members 39, and a certain distance is set between the multiple transverse steel bars. This distance is calculated based on the site conditions. The first fixing member 38 and the second fixing member 39 are fixed together by tying, and then concrete is poured. After the concrete hardness reaches the strength requirement, the first fixing member 38 and the second fixing member 39 are fixed. The second fixing member 39 can constrain the concrete, preventing excessive deformation or cracking of the concrete when it is subjected to tension or compression, thereby improving the overall stability of the connection structure 3.

[0050] The present application has been described in detail above. Specific examples have been used herein to illustrate the principles and implementation methods of the present application. The description of the above embodiments is intended only to facilitate understanding of the present application and its core concepts. It should be noted that, without departing from the principles of the present application, a number of improvements and modifications may be made to the present application by a person skilled in the art, and such improvements and modifications shall fall within the scope of protection of the claims of the present application.

Claims

1. A connection structure for backfilling a large open auxiliary foundation pit of a subway, characterized in that: It comprises a ground-connected wall (2), a flat plate (4) and a support beam (1) arranged in a main foundation pit, wherein the flat plate (4) is connected to the side wall of the ground-connected wall (2), and the support beam (1) is connected to the top of the ground-connected wall (2); Wherein, a connecting structure (3) is provided between the support beam (1) and the flat plate member (4), one end of the connecting structure (3) is connected to the side end of the support beam (1), and the other end is connected to the top of the flat plate member (4), and the connecting structure (3) is used to transmit the force of the support beam (1) to the flat plate member (4); The connecting structure (3) comprises a first connecting portion (36) and a second connecting portion (37), wherein the first connecting portion (36) extends toward the support beam (1) and is inserted into the support beam (1); The second connecting portion (37) extends toward the flat plate (4) and is inserted into the flat plate (4); Wherein, the extending directions of the first connecting portion (36) and the second connecting portion (37) are perpendicular to each other; The connection structure (3) further comprises a support member (31), one end of the support member (31) being connected to the support beam (1) and the other end being connected to the flat plate member (4); The support member (31) is at least partially located inside the support beam (1), and the support member (31) is used to connect the support beam (1) and the flat plate member (4); The supporting member (31) comprises a first supporting member (311) and a second supporting member (312), the first supporting member (311) is connected to the second supporting member (312), and the first supporting member (311) is arranged obliquely downward; The second support member (312) extends toward the support beam (1) and is inserted into the support beam (1); Wherein, the connection angle between the first support member (311) and the second support member (312) is an obtuse angle.

2. The connection structure for backfilling a large open auxiliary foundation pit of a subway according to claim 1 is characterized in that: A third support member (313) is provided at one end of the first support member (311) away from the second support member (312), the third support member (313) being connected to the first support member (311), and the third support member (313) extending toward the flat plate member (4) and inserted into the flat plate member (4); Wherein, the connection angle between the second support member (312) and the third support member (313) is an obtuse angle.

3. The connection structure for backfilling a large-open auxiliary foundation pit of a subway according to claim 1 is characterized in that: An upturned beam (5) is provided between the ground-connected wall (2) and the flat plate member (4); one side of the upturned beam (5) is connected to the ground-connected wall (2), and the other side is connected to the flat plate member (4); The top of the upward-turned beam (5) is connected to the connecting structure (3), and the upward-turned beam (5) is used to support the connecting structure (3).

4. The connection structure for backfilling a large-open auxiliary foundation pit of a subway according to claim 3 is characterized in that: The connection structure (3) further includes a first reinforcing rib (34), wherein the first reinforcing rib (34) extends toward the ground connection wall (2) and is inserted into the ground connection wall (2); The first reinforcing rib (34) is arranged horizontally, and the first reinforcing rib (34) is used to reinforce the connecting structure (3).

5. The connection structure for backfilling a large-open auxiliary foundation pit of a subway according to claim 4 is characterized in that: The connecting structure (3) further includes a second reinforcing rib (35), wherein the second reinforcing rib (35) extends toward the upward-turned beam (5) and is inserted into the upward-turned beam (5); Wherein, the extension directions of the first reinforcing rib (34) and the second reinforcing rib (35) are perpendicular to each other.

6. The connection structure for backbuilding of a large-open auxiliary foundation pit of a subway according to claim 1 is characterized in that: The connecting structure (3) further comprises a first fixing member (38) and a second fixing member (39), wherein the first fixing member (38) is arranged around the first connecting portion (36), and the first connecting portion (36) is fixed in the first fixing member (38); The second fixing member (39) is arranged around the second connecting portion (37), and the second connecting portion (37) is fixed in the second fixing member (39).

7. The connection structure for backfilling a large-open auxiliary foundation pit of a subway according to claim 1 is characterized in that: There are multiple connecting structures (3), and there is a distance between two adjacent connecting structures (3); Wherein, the two connection structures (3) correspond to one ground-connected wall (2).

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