Demolition-free supporting structure for deep foundation pit and construction method thereof

Abstract

The invention discloses a demolition-free supporting structure for a deep foundation pit and a construction method of the demolition-free supporting structure, and relates to the technical field of foundation pit engineering, the demolition-free supporting structure is arranged on the basis of wall protecting piles, the demolition-free supporting structure comprises an annular pouring part, the wall protecting piles are distributed in a circle, and a construction space is defined by the inner sides of the wall protecting piles; the pouring piece is arranged in the construction space, the outer side of the pouring piece is connected with the sides, close to the construction space, of the wall protecting piles at the same time, and the axis of the pouring piece is parallel to the length direction of the wall protecting piles. The construction efficiency of reinforcing and supporting the foundation pit dado piles can be effectively improved, and meanwhile the safety and quality of foundation pit construction can be effectively guaranteed.

Description

Technical Field

[0001] The present application relates to the technical field of foundation pit engineering, and in particular to a deep foundation pit non-dismantling support structure and a construction method thereof. Background Art

[0002] Foundation pit engineering is the general term for the construction process of excavation, support, and precipitation of the ground to meet the construction needs of the basement, foundation or other underground structures of the building. Its purpose is to ensure construction safety, reduce project costs, improve construction progress, and ensure the safety and stability of the underground space during the construction of the underground structure.

[0003] In deep foundation pit projects with smaller areas, such as sewage pumping stations, temporary support structures are usually required to be set up within the enclosure formed by continuous retaining wall piles to ensure construction safety and foundation pit stability. The conventional solution is to set up support structures in sections during the foundation pit excavation process, but as the excavation depth increases, support structures need to be continuously installed and removed to adapt to the construction progress.

[0004] Therefore, the above-mentioned support method for retaining wall piles is not only inefficient, but also may cause instability of the enclosure structure formed by continuous retaining wall piles when the support structure is removed. The removal of the support is likely to cause the retaining wall piles to become unstable, which in turn causes the retaining wall piles to bend or tilt, posing a potential threat to the safety and quality of foundation pit construction. Summary of the invention

[0005] The present application provides a deep foundation pit dismantling-free support structure and a construction method thereof, which can effectively improve the construction efficiency of reinforcing the support of the foundation pit retaining wall piles, and at the same time can effectively ensure the safety and quality of the foundation pit construction.

[0006] On the one hand, the present application provides a deep foundation pit demolition-free support structure, which adopts the following technical solutions: A deep foundation pit demolition-free support structure is based on the wall protection pile arrangement, and includes a circular casting piece, a plurality of the wall protection piles are distributed in a circle, and the inner sides of the plurality of the wall protection piles are enclosed to form a construction space; The casting piece is arranged in the construction space, and the outer side of the casting piece is simultaneously connected to one side of a plurality of the wall protection piles close to the construction space, and the axis of the casting piece is parallel to the length direction of the wall protection piles.

[0007] By adopting the above technical scheme, the cast parts can provide transverse support to multiple retaining wall piles on the inner side of multiple retaining wall piles distributed in a circular shape. When the retaining wall piles have a tendency to bend or tilt, the cast parts will be under pressure and can transfer the local force to the whole, which has a better supporting effect. While improving the construction efficiency, it can also effectively ensure the safety and quality of the foundation pit construction; and at this time, the restrictions of the support structure on the construction personnel in the construction space are greatly reduced, which can facilitate the construction personnel to construct in the foundation pit.

[0008] Optionally, reinforcing steel bars are embedded inside the cast part.

[0009] By adopting the above technical solution, the overall structural strength of the casting can be effectively improved, thereby further improving the supporting effect of the casting on the multiple wall retaining piles.

[0010] Optionally, a molded part is also included; The molding part is arranged in the construction space, the outer side of the molding part is connected to a plurality of the wall protection piles at the same time, and the molding part is provided with a molding space for casting and molding the casting part.

[0011] By adopting the above technical scheme, the molded parts can assist the on-site casting of the cast parts, thereby making the construction process of the supporting structure more convenient and quick; at the same time, the molded parts can play a temporary supporting role for multiple retaining wall piles before the casting parts are cast, thereby further ensuring the safety and quality of the foundation pit construction.

[0012] Optionally, a plurality of support members are also included; After the forming part is connected to the wall protection pile, a plurality of gaps communicating with the forming space are formed between the forming part and the wall protection pile; a plurality of plug-in grooves matching the support part are opened on the wall protection pile, and after the support part is plugged into the plug-in grooves, the support part contacts and abuts against the bottom of the forming part, and a plurality of the support parts respectively cover the plurality of the gaps.

[0013] By adopting the above technical scheme, it is possible to facilitate the connection position of the formed parts on multiple wall retaining piles, thereby making it convenient for the cast parts to determine their casting and forming positions; at the same time, it can reduce the probability of concrete flowing out during the casting process of the cast parts, effectively improving the casting efficiency and casting effect of the cast parts.

[0014] Optionally, it further includes a plurality of lifting ropes; two ends of the lifting ropes are respectively connected to the molded part and the wall protection piles, and the lifting ropes are located above the molded part.

[0015] By adopting the above technical solution, it is possible to facilitate the connection between the molded parts and the wall protection piles, while having little impact on the casting process of subsequent casting parts.

[0016] Optionally, a plurality of elastic sealing members are provided on the outer side of the molded member, and when the molded member moves along its own axial direction in the construction space, the sealing members maintain contact and abutment with the wall protection piles.

[0017] By adopting the above technical solution, the probability of concrete flowing out during the casting process of the casting piece can be further reduced, thereby further effectively improving the casting efficiency and casting effect of the casting piece.

[0018] Optionally, a plurality of rollers are also provided on the outer side of the forming part, and the rollers can rotate relative to the forming part; when the forming part is located in the construction space, the plurality of rollers are respectively located in the plurality of notches, and can contact and resist against adjacent wall retaining piles; when the forming part moves along its own axial direction in the construction space, the rollers rotate relative to the forming part.

[0019] By adopting the above technical solution, it is convenient for the molded parts to enter the construction space, and it is also convenient for the molded parts to move relative to the multiple wall protection piles in the construction space.

[0020] Optionally, the molded part is further provided with a plurality of seats and control parts corresponding to the rollers; The seat body is arranged on the outer side of the molded part, and is rotatably connected to the molded part, and the rotation axis of the seat body is perpendicular to the axis of the molded part; the roller is rotatably connected to the corresponding seat body, and the rotation axis of the roller is perpendicular to the rotation axis of the seat body; one end of the control member is connected to the corresponding seat body, and the other end is located on the inner side of the molded part.

[0021] By adopting the above technical solution, the position state of the roller can be adjusted by controlling the rotation of the seat body, which makes it easier for the molded part to switch between the free movement and stop movement states, thereby further facilitating construction workers to determine the casting and molding position of the cast part on multiple retaining wall piles.

[0022] On the other hand, the present application provides a construction method for a deep foundation pit without dismantling a support structure, which adopts the following technical solution: A construction method for a deep foundation pit non-removal support structure is applied to a circular foundation pit and is used to construct a deep foundation pit non-removal support structure as described above, comprising the following steps: After digging a certain depth downwards on the inner side of the plurality of the retaining wall piles, the construction space having a certain depth is formed; The molded part is placed in the construction space, so that the molded part is connected to the plurality of the wall protection piles at the same time, and the outer side of the molded part is in contact with and against the plurality of the wall protection piles at the same time; Arranging the reinforcing steel bars in the forming space; Concrete is poured in the forming space, and after the reinforcing steel bars are buried in the concrete, the concrete is solidified to form the cast part.

[0023] In summary, the present application includes at least one of the following beneficial effects: 1. It can effectively support multiple retaining wall piles, thereby effectively ensuring the safety and quality of foundation pit construction; 2. It can make the construction of the supporting structure more convenient, and at the same time can effectively reduce the impact of the supporting structure on subsequent construction, thereby facilitating subsequent construction in the construction space; 3. It can facilitate construction workers to cast the castings on site, and at the same time can effectively improve the casting efficiency and casting quality of the castings, and ensure the supporting effect of the supporting structure on multiple retaining wall piles. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a top view of a deep foundation pit removal-free support structure according to Example 1; Figure 2 is a longitudinal cross-sectional view of the support structure of the deep foundation pit that does not require removal during the initial excavation of the foundation pit in Example 1; Figure 3 yes Figure 2 The enlarged view of point A in the middle; Figure 4 is a longitudinal cross-sectional view of the support structure of the deep foundation pit that does not need to be dismantled after the foundation pit is completely excavated in Example 1; Figure 5 is a top view of a deep foundation pit removal-free support structure according to Example 2; Figure 6 is a partial longitudinal cross-sectional view of a deep foundation pit free-of-removal support structure after construction in Example 2; Figure 7 yes Figure 6 The enlarged view of point B in the middle; Figure 8 is a schematic diagram of a partial result from a bird's-eye view after the construction of the molded part in Example 2; Fig. 9 It is a schematic diagram of the partial result from an upward perspective after the molded part is constructed in Example 2.

[0025] Explanation of the reference numerals in the accompanying drawings: 1. wall protection pile; 11. plug-in groove; 2. construction space; 21. notch; 3. cast part; 4. molded part; 41. molding space; 42. roller; 43. seat body; 44. control part; 45. sealing part; 5. reinforcing steel bar; 6. lifting rope; 7. support part. DETAILED DESCRIPTION

[0026] The following is combined with Figure 1-9 This application is described in further detail.

[0027] Embodiment 1: Reference Figure 1 and Figure 2 , the embodiment of the present application discloses a deep foundation pit non-removal support structure, which is used to support the foundation pit. In this embodiment, the foundation pit is preferably a circular foundation pit, and a plurality of retaining wall piles 1 are distributed around the foundation pit in a circular trajectory; and the retaining wall piles 1 are preferably approximately cylindrical in structure as a whole, and a plurality of retaining wall piles 1 form an integrated structure, and a construction space 2 for building construction can be formed after digging downward to a certain depth in the area enclosed by the plurality of retaining wall piles 1; since the retaining wall piles 1 are the prior art in this field, they will not be described in detail here, and they are only briefly indicated in the attached drawings.

[0028] Reference Figure 2 and Figure 3 The supporting structure includes a casting 3 formed by pouring concrete, a molding 4 for casting the casting 3, a reinforcing steel bar 5 for strengthening the structural strength of the casting 3, and a plurality of lifting ropes 6.

[0029] The molding 4 is annular in structure, and its size matches the size of the construction space 2 formed by the plurality of retaining wall piles 1, and it is installed in the construction space 2; after the molding 4 is installed in the construction space 2, its axis is parallel to the axis of the retaining wall pile 1, and it can move along its own axis in the construction space 2. The molding part 4 has a molding space 41 for molding the casting part 3, and the molding space 41 is also in a circular ring structure as a whole, and the axis of the molding space 41 coincides with the axis of the molding part 4. The molding space 41 is formed on the molding part 4 along the axis direction of the molding part 4 and penetrates one side of the molding part 4 to form an opening for concrete to enter the molding space 41, and penetrates the outer side of the molding part 4 to form an opening for the casting part 3 to be connected with the plurality of retaining wall piles 1.

[0030] The forming member 4 is installed in the construction space 2 in a position in which the opening for concrete to enter the forming space 41 is facing upward, and there is a gap communicating with the forming space 41 and a plurality of notches 21 between the forming member 4 and the plurality of retaining wall piles 1. Before pouring concrete in the forming space 41, temporary support and sealing treatment is required at the bottom of the forming member 4 to reduce the probability of concrete flowing out of the gap and the plurality of notches 21. In this embodiment, since the above-mentioned temporary support and sealing treatment are both prior arts in the art, they are not described in detail here, and they are omitted in the drawings.

[0031] After the casting position of the casting piece 3 is determined on the plurality of retaining wall piles 1 , the molding piece 4 needs to be positioned on the plurality of retaining wall piles 1 and temporarily connected to the plurality of retaining wall piles 1 , so as to facilitate the subsequent casting of the casting piece 3 in the molding space 41 .

[0032] The formed part 4 is temporarily connected to the plurality of wall protection piles 1 through a plurality of lifting ropes 6. In this embodiment, it is preferred that the plurality of lifting ropes 6 correspond to the plurality of wall protection piles 1 one by one, and when the formed part 4 is connected to the plurality of wall protection piles 1 through the plurality of lifting ropes 6, the plurality of lifting ropes 6 are distributed in a circular array with the axis of the formed part 4 as the axis.

[0033] The two ends of the lifting rope 6 are respectively fixedly connected to the corresponding wall protection pile 1 and the top of the molded part 4 near the inner side. The connection position of the lifting rope 6 and the wall protection pile 1 is higher than the position of the molded part 4. At this time, the length direction of the lifting rope 6 is inclined relative to the axis of the molded part 4, and the end of the lifting rope 6 close to the molded part 4 is the inclined lower end. In this embodiment, the lifting rope 6 is preferably a steel wire rope, and the lifting rope 6 is preferably fixedly connected to the wall protection pile 1 and the molded part 4 through a detachably connected lifting ear; since the steel wire rope and the lifting ear are both existing technologies in the field, they are not described here in detail. The steel wire rope is only briefly represented in the drawings and the lifting ear is omitted.

[0034] After the forming part 4 is connected to the multiple wall retaining piles 1 through multiple lifting ropes 6, the reinforcing steel bars 5 are first arranged in the forming space 41, and then concrete is poured in the forming space 41. Finally, after the casting part 3 is formed, the reinforcing steel bars 5 will be buried inside the casting part 3 to effectively improve the structural strength of the casting part 3.

[0035] Reference Figure 2 and Figure 4 After the concrete is cast and formed with the reinforcing steel bars 5 in the forming space 41 to form the casting 3, the forming piece 4 and the multiple lifting ropes 6 are disconnected from the multiple wall retaining piles 1, and the forming piece 4 can be controlled to move in the construction space 2. After the position is determined on the multiple wall retaining piles 1, the forming piece 4 is connected to the multiple wall retaining piles 1 through the multiple lifting ropes 6, and another casting 3 can be cast at another position on the multiple wall retaining piles 1.

[0036] The implementation principle of a deep foundation pit removal-free support structure in the embodiment of the present application is: After excavating a certain depth downwards to form a construction space 2 in the area surrounded by multiple retaining wall piles 1, a molded part 4 is placed in the molding space 41, and then the molded part 4 is controlled to move to a suitable position, and then connected to the multiple retaining wall piles 1 through multiple hanging parts, reinforcing steel bars 5 are arranged in the molding space 41, and then concrete is poured in the molding space 41 to obtain a casting part 3; At this time, the casting 3 can stably provide lateral support for the multiple retaining wall piles 1. When the retaining wall piles 1 have a tendency to bend or tilt, the force applied to the local casting 3 will be transmitted to the casting 3 as a whole, so that the casting is compressed as a whole, thus stably ensuring the safety and quality of the foundation pit. Afterwards, continue to dig downward until a construction space 2 of the required depth is obtained, and cast the required number of castings 3 through the above steps to improve the structural stability of the multiple retaining wall piles 1, thereby improving the structural stability of the foundation pit and facilitating the construction workers to carry out subsequent construction in the construction space 2.

[0037] Embodiment 2: Reference Figure 5 and Figure 6 The difference between this embodiment and embodiment 1 lies in the forming member 4 , and the supporting structure further includes a plurality of supporting members 7 for supporting the forming member 4 .

[0038] Reference Figure 7 and Figure 8 In order to facilitate the movement of the forming part 4 in the construction space 2, it is preferred that a plurality of rollers 42 are installed on the forming part 4, and in order to facilitate the construction personnel to control the freedom of movement of the forming part 4, it is preferred that a plurality of seats 43 and a plurality of control parts 44 are also installed on the forming part 4.

[0039] The plurality of seats 43 are installed outside the molding 4, and the plurality of seats 43 are arranged in a circular array on the molding 4 with the axis of the molding 4 as the axis. The seats 43 are rotatably connected to the molding 4, and the rotation axis of the seats 43 is perpendicular to and intersects with the axis of the molding 4.

[0040] The roller 42 is installed at one end of the corresponding seat body 43 close to the outer side of the molded part 4. The roller 42 is rotatably connected to the corresponding seat body 43. The rotation axis of the roller 42 is perpendicular to the rotation axis of the seat body 43, and the position state of the rotation axis of the roller 42 will change with the rotation of the corresponding seat body 43.

[0041] The control member 44 passes through the molding member 4, one end of which is fixedly connected to one end of the corresponding seat body 43 close to the inner side of the molding member 4, and the other end is located inside the molding member 4. At this time, the construction personnel can control the corresponding seat body 43 to rotate relative to the molding member 4 through the control member 44 in the space inside the molding member 4.

[0042] The roller 42 also has a certain elasticity. When the molded part 4 is placed in the construction space 2, the multiple rollers 42 and the multiple seats 43 will be respectively located in the multiple gaps 21 formed between the molded part 4 and the multiple wall retaining piles 1; at this time, during the movement of the molded part 4 in the construction space 2, the roller 42 will maintain contact with the adjacent wall retaining piles 1 and be in a squeezed state.

[0043] The seat 43 is limited in its rotation relative to the molded part 4. When the seat 43 rotates to an extreme position relative to the molded part 4, the rotation axis of the corresponding roller 42 will be horizontal, and the molded part 4 is in a state of being able to move freely, and during the movement of the molded part 4 in the construction space 2, the multiple rollers 42 can rotate relative to the corresponding seat 43; when the seat 43 rotates to another extreme position relative to the molded part 4, the rotation axis of the corresponding roller 42 will be vertical, and the friction between the roller 42 and the adjacent retaining wall pile 1 will have the effect of preventing the molded part 4 from moving, so that the molded part 4 is in a state of limited movement.

[0044] In addition, when the rotation axis of the roller 42 is in a vertical state, the roller 42 located in the notch 21 can cover most of the notch 21 , effectively reducing the concrete in the molding space 41 from flowing out of the notch 21 .

[0045] Reference Figure 7 and Figure 8 Furthermore, in order to further reduce the probability of concrete flowing out of the forming space 41, it is preferred that a plurality of elastic seals 45 are fixedly installed on the outer side of the forming member 4. In this embodiment, it is preferred that the number of seals 45 installed on the forming member 4 is equal to the number of the seat bodies 43, and the seals 45 are in an arc-shaped strip structure, and the seals 45 are located between adjacent seat bodies 43.

[0046] After the molded part 4 is placed in the construction space 2, the outer side of the molded part 4 will contact and abut against the plurality of wall protection piles 1 through the plurality of seals 45, and the seals 45 will be in a squeezed state. At this time, the friction between the seals 45 and the wall protection piles 1 can further facilitate the molded part 4 to determine the position during the movement process.

[0047] Reference Figure 7 and Fig. 9 The support member 7 is detachably connected to the wall protection pile 1, and a plug-in slot 11 for the support member 7 to be plugged into is provided on the inner side of the wall protection pile 1. The plurality of plug-in slots 11 are distributed in a circular array with the axis of the circular distribution of the plurality of wall protection piles 1 as the axis. In this embodiment, the plug-in slots 11 are preferably provided between adjacent wall protection piles 1, that is, the plug-in slots 11 are provided on adjacent wall protection piles 1 at the same time.

[0048] After the multiple support members 7 are installed on the multiple wall retaining piles 1, the molding member 4 placed in the construction space 2 will contact and abut against the multiple support members 7 at the same time during the downward movement. At this time, the end face of the support member 7 will fit and abut against the bottom end face of the molding member 4, and the multiple support members 7 will respectively form a blockage under the multiple gaps 21 formed between the molding member 4 and the multiple wall retaining piles 1, thereby further reducing the probability of concrete in the molding space 41 flowing out through the gaps 21.

[0049] The implementation principle of a deep foundation pit removal-free support structure in the embodiment of the present application is: After excavating a certain depth downward to form a construction space 2 in the area surrounded by the plurality of retaining wall piles 1, firstly determine the casting positions of the casting members 3 on the plurality of retaining wall piles 1, then open a plurality of inserting grooves 11 on the plurality of retaining wall piles 1, and insert the plurality of supporting members 7 into the plurality of inserting grooves 11 respectively; Then, the molded part 4 is placed into the molding space 41, and then the molded part 4 is controlled to move to abut against the multiple supporting members 7 below, and then the multiple rollers 42 are controlled by the control member 44 to change the position state so that the movement of the molded part 4 is restricted, and then it is connected to the multiple retaining wall piles 1 through multiple hanging parts, and then the reinforcing steel bars 5 are arranged in the molding space 41, and then concrete is poured in the molding space 41 to obtain the casting part 3; Afterwards, continue to dig downward until a construction space 2 of the required depth is obtained, and cast the required number of castings 3 through the above steps to improve the structural stability of the multiple retaining wall piles 1, thereby improving the structural stability of the foundation pit and facilitating the construction workers to carry out subsequent construction in the construction space 2.

[0050] Embodiment 3: The present application embodiment discloses a construction method of a deep foundation pit non-removal support structure, which is used to construct a deep foundation pit non-removal support structure as described in Example 1, and includes the following steps: S1. Excavating a certain depth downwards on the inner side of a plurality of retaining wall piles 1 forms a construction space 2 with a certain depth.

[0051] After a certain depth of excavation is performed downwards in the area surrounded by the plurality of retaining wall piles 1 distributed in a circular shape to form a construction space 2 of a certain depth, the plurality of retaining wall piles 1 are firstly laterally supported.

[0052] S2. Place the molded part 4 in the construction space 2 so that the molded part 4 is connected to the plurality of wall protection piles 1 at the same time, and the outer sides of the molded part 4 are in contact with and against the plurality of wall protection piles 1 at the same time.

[0053] The formed part 4 is placed in the construction space 2, and the formed part 4 is controlled to move in the construction space 2 to the position on the multiple wall protection piles 1 where lateral support is required; then temporary support is provided under the formed part 4, and the formed part 4 is connected to the multiple wall protection piles 1 through multiple lifting ropes 6, and at the same time, the gap between the formed part 4 and the multiple wall protection piles 1 and the gap 21 are temporarily sealed.

[0054] S3, arranging reinforcing steel bars 5 in the forming space 41.

[0055] The reinforcing steel bars 5 are arranged in the forming space 41 so that the reinforcing steel bars 5 are evenly distributed in the forming space 41 .

[0056] S4, pouring concrete in the forming space 41, embedding the reinforcing steel bars 5 in the concrete, and then waiting for the concrete to solidify to form the casting part 3.

[0057] Concrete is poured in the forming space 41 so that the concrete buries the reinforcing steel bars 5 in the forming space 41 , and the concrete is vibrated and compacted, and then the concrete is solidified to form the casting 3 .

[0058] Afterwards, the molded parts 4, multiple lifting ropes 6 and structures used for support and sealing are dismantled for subsequent casting and molding of other casting parts 3; and, the existing construction space 2 is continuously dug downward until a construction space 2 of a required depth is obtained.

[0059] The above are all preferred embodiments of the present application, and the protection scope of the present application is not limited thereto. Therefore, any equivalent changes made according to the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A deep foundation pit non-demolition support structure, based on retaining wall piles (1), characterized in that: It comprises a circular casting part (3), a plurality of the wall protection piles (1) are distributed in a circular shape, and the inner sides of the plurality of wall protection piles (1) enclose a construction space (2); The casting piece (3) is arranged in the construction space (2), the outer side of the casting piece (3) is simultaneously connected to a side of a plurality of the wall retaining piles (1) close to the construction space (2), and the axis of the casting piece (3) is parallel to the length direction of the wall retaining piles (1).

2. A deep foundation pit removal-free support structure according to claim 1, characterized in that: Reinforcing steel bars (5) are embedded inside the cast part (3).

3. A deep foundation pit removal-free support structure according to claim 2, characterized in that: Also includes a molded part (4); The molded part (4) is arranged in the construction space (2), the outer side of the molded part (4) is simultaneously connected to a plurality of the wall protection piles (1), and the molded part (4) has a molding space (41) for casting and molding the casting part (3).

4. A deep foundation pit removal-free support structure according to claim 3, characterized in that: Also includes a plurality of support members (7); After the molding (4) is connected to the wall protection pile (1), a plurality of notches (21) communicating with the molding space (41) are formed between the molding (4) and the wall protection pile (1); a plurality of plug-in slots (11) matching the support member (7) are provided on the wall protection pile (1); after the support member (7) is plugged into the plug-in slots (11), the support member (7) contacts and abuts against the bottom of the molding (4), and a plurality of the support members (7) respectively cover a plurality of the notches (21).

5. A deep foundation pit removal-free support structure according to claim 4, characterized in that: It also comprises a plurality of lifting ropes (6); the two ends of the lifting ropes (6) are respectively connected to the formed part (4) and the wall protection pile (1), and the lifting ropes (6) are located above the formed part (4).

6. The deep foundation pit removal-free support structure according to claim 4, characterized in that: A plurality of elastic sealing members (45) are arranged on the outer side of the molded member (4), and when the molded member (4) moves along its own axial direction in the construction space (2), the sealing members (45) maintain contact and abutment with the wall retaining piles (1).

7. A deep foundation pit removal-free support structure according to claim 6, characterized in that: A plurality of rollers (42) are also provided on the outer side of the molded part (4), and the rollers (42) are capable of rotating relative to the molded part (4); when the molded part (4) is located in the construction space (2), the plurality of rollers (42) are respectively located in the plurality of notches (21) and are capable of contacting and abutting against adjacent retaining wall piles (1); when the molded part (4) moves along its own axial direction in the construction space (2), the rollers (42) rotate relative to the molded part (4).

8. The deep foundation pit removal-free support structure according to claim 7, characterized in that: The molded part (4) is also provided with a plurality of seat bodies (43) corresponding to the rollers (42) and a control part (44); The seat body (43) is arranged on the outer side of the molded part (4), is rotatably connected to the molded part (4), and the rotation axis of the seat body (43) is perpendicular to the axis of the molded part (4); the roller (42) is rotatably connected to the corresponding seat body (43), and the rotation axis of the roller (42) is perpendicular to the rotation axis of the seat body (43); one end of the control member (44) is connected to the corresponding seat body (43), and the other end is located on the inner side of the molded part (4).

9. A method for constructing a deep foundation pit non-removal support structure, applied to a circular foundation pit, and used to construct a deep foundation pit non-removal support structure as claimed in any one of claims 3 to 8, characterized in that: The following steps are involved: After digging a certain depth downwards on the inner side of the plurality of retaining wall piles (1), the construction space (2) having a certain depth is formed; The molded part (4) is placed in the construction space (2), so that the molded part (4) is connected to the plurality of wall protection piles (1) at the same time, and the outer sides of the molded part (4) are in contact with and abut against the plurality of wall protection piles (1) at the same time; Arranging the reinforcing steel bars (5) in the forming space (41); Concrete is poured in the forming space (41), and the reinforcing steel bars (5) are embedded in the concrete, and then the concrete is solidified to form the cast part (3).

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