Co-pit co-construction new and old enclosure connecting structure and construction method thereof

Abstract

The invention relates to the technical field of building foundation pit enclosure structures, in particular to a co-pit co-construction new and old enclosure connecting structure and a construction method thereof. The co-pit co-construction new and old enclosure connecting structure comprises an existing diaphragm wall, a newly-built diaphragm wall, a transfer wall and a reinforcing wall; the transfer wall is arranged between the existing diaphragm wall and the newly-built diaphragm wall, and the newly-built diaphragm wall is connected with the transfer wall; a water stop plate is further arranged between the adapter wall and the existing underground diaphragm wall, the water stop plate is tightly attached to the surface of the existing underground diaphragm wall, and the adapter wall is tightly attached to the surface of the water stop plate; a first embedded steel bar is arranged on the existing diaphragm wall, and the first embedded steel bar is arranged on one side of the transfer wall; embedded ribs are arranged on the transfer wall; the reinforcing wall is arranged on the surface of the existing diaphragm wall and is parallel to the transfer wall, and the first embedded bars and the embedded bars are connected with a reinforcement cage in the reinforcing wall. Firm connection between the new enclosure structure and the old enclosure structure is achieved, meanwhile, the water seepage problem is effectively prevented, the stability and waterproof performance of the overall structure are improved, and a reliable technical scheme is provided for co-pit co-construction.

Description

Technical Field

[0001] The present application relates to the technical field of building foundation pit retaining structures, and in particular to a new and old retaining connection structure built in the same pit and a construction method thereof. Background Art

[0002] Joint pit construction, a modern construction technique, has been widely adopted in recent years amidst the increasing scarcity of urban land resources. By allowing new buildings to share a foundation pit with existing structures, this technology not only effectively conserves land resources but also significantly reduces construction costs. In this field, ground-connected walls, as a key form of retaining structure, have a direct impact on the quality and service life of the entire building. Therefore, ensuring the secure connection between new and existing ground-connected walls has become a key research topic.

[0003] In order to solve the connection problem between the new and old ground-connected walls, various reinforcement methods are often used in the existing technology. For example, the patent applications with announcement numbers CN110258508B and CN207176671U use a T-joint structure reinforcement structure to solve the technical problem that the new ground-connected wall and the existing ground-connected wall cannot be tightly combined, and enhance the structural stability between the new ground-connected wall and the existing ground-connected wall.

[0004] However, the above solution requires drilling holes in the existing ground-connected wall to install fixing bolts to secure the joint. However, drilling and installing fixing bolts can damage the ground-connected wall, which in turn reduces its impermeability and allows groundwater to easily seep into the wall. Furthermore, the integrity of the existing and newly constructed ground-connected walls is poor, and the connection strength is limited by the strength of the joint structure. Summary of the Invention

[0005] The present application provides a new and old enclosure connection structure for co-building in a pit and a construction method thereof.

[0006] In the first aspect, the present application provides a new and old enclosure connection structure built in the same pit, which adopts the following technical solutions: A new and old enclosure connection structure for a common pit, comprising an existing ground connection wall, a newly built ground connection wall, a transition wall, and a reinforcement wall; the transition wall is provided between the existing ground connection wall and the newly built ground connection wall, and the newly built ground connection wall is connected to the transition wall; A water stop plate is provided between the transfer wall and the existing ground connection wall, the water stop plate is in close contact with the surface of the existing ground connection wall, and the transfer wall is in close contact with the surface of the water stop plate; The existing ground connection wall is provided with a first embedded reinforcement, and the first embedded reinforcement is provided on both sides of the transfer wall; the transfer wall is provided with embedded reinforcement; The reinforcement wall is arranged on the surface of the existing ground-connected wall and is parallel to the transition wall. The first planted reinforcement bars and pre-embedded reinforcement bars are both connected to the steel cage inside the reinforcement wall.

[0007] By adopting this technical solution, a transition wall is installed between the existing ground-connected wall and the newly constructed ground-connected wall, and a waterstop plate ensures a tight fit, effectively preventing water seepage. The first planted and pre-buried bars extend from the existing ground-connected wall and transition wall, respectively, to the reinforcement cage within the reinforced wall, forming a stable connection structure. This strengthens the connection between the old and new ground-connected walls and avoids the structural damage and indirect connection defects of traditional solutions caused by drilling. The installation of the reinforced wall further enhances the stability of the overall structure and facilitates subsequent construction.

[0008] Preferably, the water stop plate extends between the reinforced wall and the existing ground-connected wall.

[0009] By adopting the above technical solution, the water stop plate extends between the reinforced wall and the existing ground-connected wall, which can effectively block water penetration, while improving the waterproof performance of the embedded reinforcement and the overall waterproof performance of the structure.

[0010] Preferably, a sliding frame is provided on the water stop plate, and the sliding frame includes two brackets arranged opposite to each other; the steel cage of the transfer wall is provided between the two brackets, and the bracket is in sliding contact with the steel cage.

[0011] By adopting the above technical solution, the water stop plate can be displaced laterally. When pouring the transition wall, the pressure of the concrete can be used to apply pressure to the water stop plate, so that the water stop plate is closely attached to the surface of the existing ground-connected wall, which is both convenient for construction and can ensure waterproof performance. In addition, the setting of the sliding frame can also provide a certain degree of guidance and support for the steel cage, ensuring the position accuracy of the steel cage during the pouring of the transition wall and enhancing the overall stability of the connection between the new and old enclosure structures. Preferably, the water stop plate includes a steel plate and a rubber plate fixedly connected to the steel plate, and the sliding frame is fixedly connected to the steel plate; the rubber plate abuts against the surface of the existing ground-connected wall.

[0012] By adopting this technical solution, the waterstop plate is composed of steel and rubber sheets. The steel plate provides structural support, while the rubber sheet adheres tightly to the surface of the existing ground-connected wall, effectively enhancing the waterstop effect and preventing water infiltration. The sliding frame is fixedly connected to the steel plate, ensuring the stable positioning of the transfer wall reinforcement cage within the sliding frame.

[0013] Preferably, the cross section of the transition wall is T-shaped and includes wing walls parallel to the existing ground connection wall and a web wall perpendicular to the existing ground connection wall, the wing walls are closely attached to the existing ground connection wall, the web wall is arranged on the side of the wing wall facing away from the existing ground connection wall, and the newly built ground connection wall is connected to the web wall; The embedded reinforcement is arranged on the web wall; the reinforcement wall fills the area between the web wall and the wing wall and fits with the web wall.

[0014] By adopting the above technical solution, the T-shaped design of the transition wall ensures a more stable connection between the existing and newly constructed ground-connected walls. The wing walls adhere closely to the existing ground-connected walls, effectively increasing the contact area between them, improving connection strength and reducing stress concentration. The web wall, positioned perpendicular to the existing ground-connected wall and connected to the newly constructed ground-connected wall, further strengthens the structural stability between the old and new ground-connected walls. Embedded reinforcement bars are placed on the web wall, providing a reliable connection point for the subsequent construction of the reinforcement wall and ensuring the overall structural strength. The reinforcement wall fills the area between the web wall and the wing walls and adheres closely to the web wall, not only fully utilizing the space but also enhancing the stability and waterproofing of the entire connection structure.

[0015] Preferably, there are two reinforcement walls, which are respectively arranged on both sides of the transfer wall.

[0016] By adopting this technical solution, two reinforcement walls are installed, one on each side of the transition wall. This structure further enhances the connection strength and stability between the old and new ground-connected walls. Specifically, by symmetrically arranging the reinforcement walls on both sides of the transition wall, the load is more evenly distributed, effectively avoiding structural deviation or deformation caused by unilateral load. Secondly, the reinforcement area is expanded, improving the overall shear resistance and load-bearing capacity of the structure, thereby better adapting to construction needs under complex geological conditions.

[0017] Preferably, the reinforcement wall extends to one side of the newly built ground-connected wall in the width direction, and the reinforcement wall is connected to the newly built ground-connected wall.

[0018] By adopting the above technical solution, the reinforcement wall is extended to one side of the width direction of the newly built ground-connected wall and connected to the newly built ground-connected wall, which can enhance the overall stability between the newly built ground-connected wall and the existing ground-connected wall, further improve the firmness of the connection between the two, and effectively prevent water seepage problems at the connection point, thereby ensuring the safety and reliability of the foundation pit retaining structure.

[0019] Preferably, the newly-built ground-connected wall is provided with a second embedded reinforcement bar, and the second embedded reinforcement bar is connected to the steel cage inside the reinforced wall.

[0020] By adopting this technical solution, a second anchor bar is installed in the new ground-connected wall and connected to the steel cage inside the reinforced wall. This strengthens the connection between the new ground-connected wall and the reinforced wall, improving the stability of the overall structure. Furthermore, this connection method eliminates the need to drill holes in the existing ground-connected wall, avoiding damage and water seepage during construction. It also simplifies the construction process and improves efficiency.

[0021] On the other hand, the present application provides a construction method for building a new and old enclosure connection structure in a common pit, comprising the following steps: Casting of the transfer wall: First, excavate the casting trough for the transfer wall, which is close to the existing ground-connected wall. First, place a water stop plate in the casting trough, with the width of the water stop plate being equal to the width of the casting trough. Then, hoist the steel cage of the transfer wall, which is equipped with embedded reinforcement. Finally, pour the concrete. The new ground-connected wall is cast, and the existing ground-connected wall is cast next to the transfer wall; foundation pit excavation; Carry out the first rebar planting construction on the existing ground-connected wall; To cast the reinforced wall, first hang the steel cage, then connect the steel cage with the first planted reinforcement and pre-buried reinforcement, finally set up the casting formwork, and finally pour the concrete.

[0022] By adopting the above-mentioned technical solution, the connection strength between the old and new ground-connected walls can be effectively enhanced. Specifically, by setting a waterstop plate when pouring the transition wall, the water-stopping performance is ensured, avoiding the water seepage problem caused by the traditional drilling method. By designing the transition wall and the reinforcement wall between the existing ground-connected wall and the newly built ground-connected wall, a direct connection between the old and new ground-connected walls is achieved, which improves the connection strength and saves space. The stability of the overall structure is further enhanced by connecting the first embedded reinforcement and pre-embedded reinforcement to the steel cage inside the reinforcement wall. Through reasonable construction steps, the coordination between the various structures and the convenience of construction are ensured, and the construction efficiency and quality are improved.

[0023] Preferably, before the reinforcement wall is cast, a second anchoring is carried out on the newly built ground-connected wall; during the reinforcement wall casting, the casting template is fixed on the steel cage through embedded bars and is hoisted together with the steel cage; the reinforcement wall casting area extends to one side of the newly built ground-connected wall and connects the reinforcement wall to the second anchoring.

[0024] By adopting this technical solution, the addition of a second embedded rebar effectively strengthened the connection between the new ground-connected wall and the reinforced wall, preventing loosening or separation between the two. The casting formwork was secured to the steel cage via embedded rebar, which not only improved stability during construction but also simplified the formwork installation process, increasing construction efficiency. The design of extending the reinforced wall casting area to one side of the new ground-connected wall further strengthened the structural integrity and stability, ensuring a tight connection between the new and existing enclosures while reducing potential water seepage risks.

[0025] In summary, the present invention includes at least one of the following beneficial technical effects: 1. The combined design of a transition wall, waterstop plate, and reinforcement wall achieves a stable connection between the new and existing ground-connected walls, improving the anti-seepage performance of the joint. Furthermore, the installation of primary and secondary anchor bars and pre-buried reinforcement further enhances the connection strength between the new and existing ground-connected walls. The reinforcement wall is cast-in-place, sealing any holes created by the primary and secondary anchor bars, thus preventing the impact of these holes on anti-seepage performance. 2. Two reinforcement walls are provided, one on each side of the transition wall. This structure further enhances the connection strength and stability between the old and new ground-connected walls. Specifically, by arranging the reinforcement walls symmetrically on both sides of the transition wall, the load is more evenly distributed, effectively avoiding structural deviation or deformation caused by unilateral load. Secondly, the reinforcement range is expanded, improving the overall structure's shear resistance and load-bearing capacity, thereby better adapting to construction needs under complex geological conditions. 3. The waterstop plate, through a combination of steel plates and rubber plates, can seal the joints between the transition wall and the existing ground-connected wall to improve the anti-seepage performance. At the same time, the rubber plate can also seal the openings of the first rebar to avoid the impact of the rebar openings on the anti-seepage performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is a schematic diagram of the overall structure of the new and old enclosure connection structure built in the same pit in the embodiment of the present application; Figure 2 This is a cross-sectional view of the connection structure of the new and old enclosures built in the same pit in an embodiment of the present application; Figure 3 This is a schematic diagram of the connection relationship between the first embedded reinforcement, the second embedded reinforcement, the embedded reinforcement, the existing ground-connected wall, the reinforced wall, and the newly built ground-connected wall in the embodiment of the present application; Figure 4 It is a schematic diagram of the locations of the foundation pit and the construction pit in the embodiment of the present application.

[0027] Markings in the attached figure: 1. Existing ground-anchored wall; 11. First embedded reinforcement; 2. New ground-anchored wall; 21. Second embedded reinforcement; 3. Transfer wall; 31. Wing wall; 32. Web wall; 33. Embedded reinforcement; 4. Reinforced wall; 5. Waterstop plate; 51. Steel plate; 52. Rubber plate; 53. Sliding frame; 6. Steel cage; 7. Foundation pit; 8. Construction pit. DETAILED DESCRIPTION

[0028] The following is combined with Figure 1-4 The present invention is described in further detail.

[0029] The embodiment of the present application provides a new and old enclosure connection structure for a common pit, referring to Figure 1 and Figure 2, including the existing ground-connected wall 1, the newly built ground-connected wall 2, the transition wall 3 and the reinforcement wall 4. Among them, the existing ground-connected wall 1 is the foundation pit retaining structure of the existing building, and the newly built ground-connected wall 2 is the foundation pit retaining structure of the new building. The transition wall 3 is arranged between the existing ground-connected wall 1 and the newly built ground-connected wall 2, and the newly built ground-connected wall 2 is connected to the transition wall 3. Both the newly built ground-connected wall 2 and the transition wall 3 are constructed by cast-in-place, so that the newly built ground-connected wall 2 and the transition wall 3 can be better combined and connected as one. A water stop plate 5 is added between the transition wall 3 and the existing ground-connected wall 1, and the water stop plate 5 is in close contact with the surface of the existing ground-connected wall 1, and the transition wall 3 is in close contact with the surface of the water stop plate 5, thereby improving the anti-seepage performance between the existing ground-connected wall 1 and the transition wall 3.

[0030] Reference Figure 2 and Figure 3 Furthermore, the existing ground-connected wall 1 is provided with a first embedded rebar 11, which is located on one side of the transition wall 3. The transition wall 3 is provided with embedded rebar 33. The reinforcement wall 4 is also cast-in-place. The reinforcement wall 4 is provided on the surface of the existing ground-connected wall 1 and parallel to the transition wall 3. The first embedded rebar 11 and the embedded rebar 33 are both connected to the steel cage 6 inside the reinforcement wall 4. Therefore, the reinforcement wall 4 can connect the existing ground-connected wall 1 and the transition wall 3 into one, thereby ensuring high connection strength and stability, thereby improving the connection strength between the new and old ground-connected walls.

[0031] Specifically, the transition wall 3 includes wing walls 31 and a web wall 32, which are perpendicular to each other to form a T-shaped structure. The wing walls 31 are arranged parallel to the existing ground-connected wall 1, and the water stop 5 is arranged on the side wall of the wing wall 31. The web wall 32 is arranged on the side of the wing wall 31 facing away from the existing ground-connected wall 1 and is perpendicular to the wing wall 31 and the existing ground-connected wall 1. During the pouring construction, the newly built ground-connected wall 2 is adjacent to the web wall 32 and connects the newly built ground-connected wall 2 to the web wall 32. The embedded reinforcement 33 is evenly distributed on the web wall 32. The embedded reinforcement 33 is made of threaded steel bars and is evenly distributed on the web wall 32. The reinforcement wall 4 fills the area between the web wall 32 and the wing wall 31 and is in close contact with the web wall 32.

[0032] Specifically, the waterstop plate 5 comprises a steel plate 51 and a rubber plate 52. The rubber plate 52 is fixedly connected to the steel plate 51. The width of the rubber plate 52 is slightly larger than that of the steel plate 51, so that both sides of the rubber plate 52 extend beyond the width of the steel plate 51. The edge of the rubber plate 52 is located between the reinforcement wall 4 and the existing ground-connected wall 1, so that the reinforcement wall 4 can further fix the edge of the rubber plate 52 and improve the anti-seepage performance.

[0033] The rubber plate 52 abuts against the surface of the existing ground-connected wall 1, playing a role in stopping water. The width of the steel plate 51 is the same as that of the wing wall 31, and is directly opposite to the side wall of the wing wall 31. A sliding frame 53 is provided on the steel plate 51. The sliding frame 53 includes two relatively arranged brackets, and the material of the bracket is channel steel. The steel cage 6 of the transfer wall 3 is arranged between the two brackets, and the bracket and the steel cage 6 are slidably abutted, allowing the waterstop plate 5 to adjust its position within a certain range. When the transfer wall 3 is poured, the pressure of the concrete will act on the steel plate 51, causing the waterstop plate 5 to abut against the side wall of the existing ground-connected wall 1. The setting of the sliding frame 53 can ensure the stability of the waterstop plate 5 on the one hand, and on the other hand, it also connects the waterstop plate 5 with the transfer wall 3 as a whole.

[0034] Furthermore, as a preferred implementation of the embodiment of the present application, two reinforcement walls 4 are provided and are respectively arranged on both sides of the transfer wall 3. In addition, as another implementation of the embodiment of the present application, only one reinforcement wall 4 can also be provided, but there is a situation where the forces on both sides of the transfer wall 3 are inconsistent.

[0035] Specifically, the reinforcement wall 4 is filled in the area between the wing wall 31 and the web wall 32, which enables the reinforcement wall 4 to limit and fix the wing wall 31, thereby improving the stability of the transition wall 3 and ensuring that the transition wall 3 fits tightly with the existing ground connection wall 1, thereby ensuring the anti-seepage performance of the water stop plate 5.

[0036] Furthermore, the length of the reinforcement wall 4 can extend to one side in the width direction of the newly built ground-connected wall 2, and the reinforcement wall 4 is connected to the newly built ground-connected wall 2. In order to improve the bonding strength between the reinforcement wall 4 and the newly built ground-connected wall 2, a second anchor bar 21 can be provided on the newly built ground-connected wall 2. The second anchor bar 21 is connected to the steel cage 6 inside the reinforcement wall 4. When the reinforcement wall 4 is cast, the second anchor bar 21 ensures a stable connection between the reinforcement wall 4 and the newly built ground-connected wall 2.

[0037] The implementation principle of this embodiment is as follows: through the combined design of the transition wall 3, the water stop plate 5 and the reinforcement wall 4, a stable connection between the old and new ground-connected walls is achieved. The T-shaped structure of the transition wall 3 can effectively transmit shear force and pressure. The reinforcement wall 4 is constructed by cast-in-place, which can seal the holes generated by the construction of the first embedded reinforcement 11 and the second embedded reinforcement 21, avoiding the impact of the opening on the anti-seepage performance. At the same time, the reinforcement wall 4 further enhances the integrity of the existing ground-connected wall 1 and the newly built ground-connected wall 2, ensuring the connection strength and durability between the old and new ground-connected walls. Compared with the existing technology, the overall solution significantly improves the connection strength and reduces the risk of water seepage.

[0038] This application further discloses a construction method for building a new and old enclosure connection structure in a common pit, specifically comprising the following steps: The first step is to cast the transfer wall 3; first, excavate the casting trough for the transfer wall 3, and the casting trough is excavated close to the existing ground-connected wall 1; first place the water stop plate 5 in the casting trough, and the width of the water stop plate 5 is equivalent to the width of the casting trough; then hang the steel cage 6 of the transfer wall 3, and the steel cage 6 is provided with embedded bars 33; finally, pour concrete.

[0039] In the second step, the new ground-connected wall 2 is cast, and the existing ground-connected wall 1 is cast next to the transfer wall 3.

[0040] The third step is to excavate the foundation pit. While the foundation pit is being excavated, foundation pit support is set up inside the pit.

[0041] In the fourth step, the first anchoring bar 11 is constructed on the existing ground-anchored wall 1, and the second anchoring bar 21 is constructed on the newly-built ground-anchored wall 2.

[0042] Reference Figure 4 Since in one embodiment of the present application, two reinforcement walls 4 are set and are located on both sides of the transfer wall 3, in order to ensure the normal construction of the reinforcement wall 4, in the third step, it is necessary to excavate a construction pit on the side of the new ground-connected wall 2 facing away from the foundation pit, and carry out the first embedded rebar 11 construction, the second embedded rebar 21 construction and the casting construction of the reinforcement wall 4 in the construction pit.

[0043] The fifth step is to cast the reinforcement wall 4. First, the steel cage 6 is hung, and then the steel cage 6 and the first embedded reinforcement 11 and the embedded reinforcement 33 are connected. Then, the casting template is set up, and finally, the concrete is poured.

[0044] As a preferred implementation method of the embodiment of the present application, the casting formwork can also be first connected to the embedded reinforcement 33, so that it is fixed on the reinforcement cage 6 and hung together with the reinforcement cage 6; the casting area of the reinforcement wall 4 extends to one side in the width direction of the newly built ground-connected wall 2, and the reinforcement cage 6 of the reinforcement wall 4 is connected to the second embedded reinforcement 21.

[0045] After the construction of the reinforcement wall 4 is completed, the construction pit excavated in the third step is backfilled.

[0046] The embodiments of this specific implementation method are all preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A new and old enclosure connection structure built in the same pit, characterized by: The invention comprises an existing ground-connected wall (1), a newly built ground-connected wall (2), a transfer wall (3) and a reinforcement wall (4); the transfer wall (3) is arranged between the existing ground-connected wall (1) and the newly built ground-connected wall (2), and the newly built ground-connected wall (2) is connected to the transfer wall (3); A water stop plate (5) is also provided between the transfer wall (3) and the existing ground connection wall (1), the water stop plate (5) is in close contact with the surface of the existing ground connection wall (1), and the transfer wall (3) is in close contact with the surface of the water stop plate (5); The existing ground connection wall (1) is provided with a first embedded reinforcement (11), and the first embedded reinforcement (11) is provided on both sides of the transition wall (3); the transition wall (3) is provided with pre-embedded reinforcement (33); The reinforcement wall (4) is arranged on the surface of the existing ground-connected wall (1) and is parallel to the transition wall (3); the first embedded reinforcement bars (11) and the pre-embedded reinforcement bars (33) are both connected to the reinforcement cage (6) inside the reinforcement wall (4).

2. The new and old enclosure connection structure for a common pit as claimed in claim 1 is characterized by: The water stop plate (5) extends between the reinforced wall (4) and the existing ground-connected wall (1).

3. The new and old enclosure connection structure for a common pit as claimed in claim 1 is characterized by: A sliding frame (53) is provided on the water stop plate (5), and the sliding frame (53) includes two brackets arranged opposite to each other; the steel cage (6) of the transfer wall (3) is provided between the two brackets, and the bracket and the steel cage (6) are in sliding contact.

4. The new and old enclosure connection structure for a common pit as claimed in claim 3 is characterized by: The water stop plate (5) comprises a steel plate (51) and a rubber plate (52) fixedly connected to the steel plate (51); the sliding frame (53) is fixedly connected to the steel plate (51); and the rubber plate (52) abuts against the surface of the existing ground-connected wall (1).

5. The new and old enclosure connection structure for a common pit as claimed in claim 1 is characterized by: The cross section of the transition wall (3) is T-shaped and comprises a wing wall (31) parallel to the existing ground connection wall (1) and a web wall (32) perpendicular to the existing ground connection wall (1); the wing wall (31) is closely attached to the existing ground connection wall (1); the web wall (32) is arranged on the side of the wing wall (31) facing away from the existing ground connection wall (1); and the newly built ground connection wall (2) is connected to the web wall (32); The embedded reinforcement (33) is provided on the web wall (32); the reinforcement wall (4) fills the area between the web wall (32) and the wing wall (31) and fits with the web wall (32).

6. The new and old enclosure connection structure for a common pit as claimed in claim 5 is characterized by: The reinforcement walls (4) are provided in two and are respectively arranged on both sides of the transfer wall (3).

7. The new and old enclosure connection structure for a common pit as claimed in claim 1 is characterized by: The reinforcement wall (4) extends to one side of the new ground-connected wall (2) in the width direction, and the reinforcement wall (4) is connected to the new ground-connected wall (2).

8. The new and old enclosure connection structure for a common pit as claimed in claim 7 is characterized by: The newly built ground-connected wall (2) is provided with a second embedded reinforcement (21), and the second embedded reinforcement (21) is connected to the steel cage (6) inside the reinforced wall (4).

9. A construction method for building a new and old enclosure connection structure in the same pit, characterized in that: The following steps are involved: The transfer wall (3) is poured; first, a pouring trough for the transfer wall (3) is excavated, and the pouring trough is excavated close to the existing ground-connected wall (1); first, a water stop plate (5) is placed in the pouring trough, and the width of the water stop plate (5) is equivalent to the width of the pouring trough; then, a steel cage (6) of the transfer wall (3) is hoisted, and pre-embedded steel bars (33) are provided on the steel cage (6); finally, concrete is poured; The new ground-connected wall (2) is cast, and the existing ground-connected wall (1) is cast next to the transfer wall (3); foundation pit excavation; Carrying out the first planting of reinforcement bars (11) on the existing ground-connected wall (1); The reinforcement wall (4) is poured by first hanging the steel cage (6), then connecting the steel cage (6) and the first embedded reinforcement (11) and the pre-buried reinforcement (33), finally setting up the pouring formwork, and finally pouring the concrete.

10. The construction method for building a new and old enclosure connection structure in the same pit according to claim 9 is characterized in that: Before the reinforcement wall (4) is cast, the second embedded reinforcement (21) is constructed on the newly built ground-connected wall (2); during the reinforcement wall (4) casting construction, the casting template is fixed on the steel cage (6) through the pre-buried reinforcement (33) and is suspended together with the steel cage (6); the reinforcement wall (4) casting area extends to one side of the newly built ground-connected wall (2) and connects the reinforcement wall (4) to the second embedded reinforcement (21).

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