A buffer structure for new-old basement connection and construction method thereof

Abstract

The application discloses a buffer structure for connecting new and old basements, which comprises a buffer concrete structure, a rubber waterstop, a waterproof plate, a grouting pipe and a concrete reinforcing area; the buffer concrete structure is connected with new concrete by using the rubber waterstop; the waterproof plate is arranged between the buffer concrete structure and old concrete and comprises horizontal waterproof plates and vertical waterproof plates; the horizontal waterproof plates are arranged under the buffer concrete structure and the old concrete; the vertical waterproof plates are arranged at construction joints of the buffer concrete structure and the old concrete; steel bars in the old concrete are connected with steel bars in the buffer concrete structure through the waterproof plate; the grouting pipe is arranged on the vertical waterproof plate; and the concrete reinforcing area wraps the horizontal waterproof plates and connects the buffer concrete structure and the old concrete. The application also provides a construction method for connecting new and old basements. The application can well connect the new and old basements, and can make the basements have good waterproof effect and connectivity and prevent settlement accidents.

Description

TECHNICAL FIELD

[0001] The present application belongs to the field of building construction, and particularly relates to a buffer structure for connecting new and old basements and a construction method thereof. BACKGROUND

[0002] Some large real estate projects, due to large building area and volume, will be developed in stages, but because of the use function and planning reasons, the basement of the staged project needs to be connected without gaps to form a whole basement. The connection design problem of the new underground space is a difficult problem in engineering. The traditional water stop steel plate cannot be set at the old concrete joint, so water leakage or settlement accidents may occur. Light causes waterproof leakage, heavy causes surrounding building settlement, displacement, cracking, and even may cause underground pipeline displacement and fracture.

[0003] At present, the commonly used method is to chisel the connecting joint, and then repair the cracks by "shooting". However, the waterproofness and connectivity of this waterproof are poor, and the corresponding strength and waterproof effect cannot be achieved, and water leakage and settlement accidents may also occur. Therefore, there is an urgent need for a connecting structure that can effectively waterproof and strengthen the connection strength of new and old concrete. SUMMARY

[0004] The purpose of the present application is to provide a buffer structure for connecting new and old basements and a construction method thereof, which can well connect new and old basements and have good waterproof effect and connectivity, and prevent settlement accidents.

[0005] The technical solution adopted by the present application is:

[0006] A buffer structure for connecting new and old basements, comprising a buffer concrete structure, a rubber water stop belt, a waterproof plate, a grouting pipe and a concrete reinforcement area;

[0007] The buffer concrete structure is arranged between the new concrete of the new basement and the old concrete of the old basement; the buffer concrete structure is connected with the new concrete by the rubber water stop belt;

[0008] The waterproof plate is arranged between the buffer concrete structure and the old concrete, and comprises a horizontal waterproof plate and a vertical waterproof plate, the vertical waterproof plate is connected with the horizontal waterproof plate by a rubber expansion water stop structure; the horizontal waterproof plate and the vertical waterproof plate are both made of a rubber expansion water stop material wrapped around a steel plate; the horizontal waterproof plate is arranged below the buffer concrete structure and the old concrete, and the upper surface thereof is flush with the upper surface of the cushion layer; the vertical waterproof plate is arranged at the construction joint of the buffer concrete structure and the old concrete, effectively closes the construction joint of the buffer concrete structure and the old concrete, and forms a waterproof layer; the steel bars in the old concrete pass through the rubber expansion water stop structure and are connected with the steel bars in the buffer concrete structure;

[0009] The grouting pipe is arranged on the vertical waterproof plate, and the grouting pipe is provided with overflow holes and grouting needle holes;

[0010] The concrete reinforcing area is wrapped with the horizontal waterproof plate, and is connected with the buffer concrete structure and the old concrete, and the upper surface of the concrete reinforcing area is flush with the upper surface of the cushion layer, so as to prolong the water permeation path of the construction joint of the buffer concrete structure and the old concrete.

[0011] Further, the upper end of the steel plate of the vertical waterproof plate is provided with a rubber expansion sealing material, and is connected with the steel bars in the old concrete through the fixed steel bars.

[0012] Further, the grouting pipe is connected with the fixed steel bars.

[0013] Further, the rubber sealing belt is arranged transversely and is perpendicular to the construction joint of the buffer concrete structure and the new concrete.

[0014] Further, the rubber sealing belt is arranged between the upper steel bars and the lower steel bars of the buffer concrete structure and the new concrete.

[0015] Further, the transverse section of the concrete reinforcing area is 1m*0.5m, and the depth is 50cm.

[0016] Further, the steel plate of the horizontal waterproof plate and the vertical waterproof plate is a 2mm steel plate.

[0017] The application also provides a construction method for connecting new and old basements, which adopts the above buffer structure for connecting new and old basements.

[0018] Further, the method comprises the following steps:

[0019] 1) the steel bars of the new basement concrete area are bound, a distance is left for the later construction of the buffer concrete structure, the rubber sealing belt is arranged at the joint, one side of the rubber sealing belt is inserted into the new basement concrete area, and the other side is reserved for later pouring into the buffer concrete structure for sealing;

[0020] 2) the old basement concrete area is broken, the construction joint is left, and the joint is cleaned;

[0021] 3) Excavate within the designed concrete reinforcement area to a depth of 50 cm and a width of 50 cm on both sides, forming an area with a cross-section of 1 m × 0.5 m and a depth of 50 cm. One side of this area extends 50 cm into the bottom of the old basement concrete, and the other side is placed under the buffer concrete structure;

[0022] 4) Pour the new basement concrete and cushion layer under the buffer concrete structure so that the cushion layer is flush with the cushion layer under the old concrete;

[0023] 5) Tie the upper and lower layers of reinforcement within the buffer concrete structure, using the same structure as the reinforcement in the newly constructed basement concrete area. Connect the upper layer of reinforcement within the old concrete directly to the upper layer of reinforcement within the buffer concrete structure, and pass the lower layer of reinforcement within the old concrete through the holes in the rubber expansion waterstop on the waterproofing board and connect to the lower layer of reinforcement within the buffer concrete structure. Install fixed reinforcement, connecting both ends of the fixed reinforcement to the upper and lower layers of reinforcement within the old concrete. Extend a short horizontal reinforcement from the middle of the fixed reinforcement and connect it to the steel plate on the vertical waterproofing board that extends beyond the rubber expansion waterstop.

[0024] 6) Install a grouting pipe on the top of the vertical waterproofing board and connect it to the short horizontal steel bar; the overflow hole on the grouting pipe should face the construction joint between the old concrete and the buffer concrete structure to facilitate grouting in the later stage;

[0025] 7) Pour the concrete structure of the concrete reinforcement area and the buffer concrete structure area, vibrate and compact it to effectively connect the new and old concrete structures with the buffer concrete structure;

[0026] 8) Before the concrete begins to set, start injecting epoxy polymer cement concrete mortar into the grouting pinhole. The mortar flows into the construction joint under high pressure through the grouting pipe and overflow hole, sealing the gaps that were not fully vibrated and enhancing its waterproof ability.

[0027] 9) After pouring and grouting are completed, the membrane is sealed and maintained. The buffer concrete structure is now integrated with the existing basement concrete structure. The new basement concrete structure and the buffer concrete structure are connected by an expansion joint formed by a rubber waterstop. During the settlement of the new basement, the soft waterproofing of the rubber waterstop effectively prevents water from leaking, and the buffer concrete structure cushions the settlement, preventing cracking and settlement of the construction joints in the old basement area.

[0028] In the present invention, the rubber expansion water-stopping material may be a water-stopping material mixed with an inorganic water-absorbing material or a high-viscosity resin.

[0029] The beneficial effects of the present invention are:

[0030] By adding a buffer concrete structure between the new and old basement, using rubber waterstop belt to connect with the new concrete on one side, using waterproof board structure to connect with the old concrete on the other side, and setting grouting pipe on the waterproof board, the connecting section of the new and old basement is connected in a buffer mode, which can effectively prevent water flow from entering, and by means of high-pressure grouting, expansion waterstop and the like, the waterproof life is prolonged and the repair convenience is improved, so as to play a certain anti-settling and waterproof reinforcing role; the water seepage probability at the construction joint is reduced, the structure at the construction joint is reinforced, and certain quality optimization results and economic benefits are achieved.

[0031] The waterproof board structure is composed of a steel plate wrapped by rubber expansion waterstop material, which can ensure the adhesive connection with the concrete, improve the waterproof guarantee period under the action of the steel plate after pouring, and realize the anti-cracking effect to a certain extent.

[0032] The waterproof board is fixed with the steel bar in a perforated manner and an upper welding manner, which does not hinder the effective connection of the buffer structure with the steel bar of the old basement plate, and can effectively combine the waterproof material and the concrete plate, thereby enhancing the waterproof performance.

[0033] The fixed steel bar is fixedly connected with the waterproof board and the grouting pipe through short cross steel bars, which achieves two purposes at a time and makes the structure more stable and reliable.

[0034] The concrete reinforcing area extends 50 cm to the buffer concrete structure and the old concrete area of the old basement, prolongs the water flow path between the new and old concrete, and is an integral structure with the buffer concrete structure, which can play a certain anti-cracking and anti-settling reinforcing effect.

[0035] After the concrete pouring of the newly built basement is completed, the concrete of the buffer structure is poured, which is separately opened, and plays a role in buffering the settlement between the new and old.

[0036] The rubber waterstop belt is used to form a expansion joint structure between the newly built basement and the buffer concrete structure, reduces the waterproof damage caused by the settlement of the newly built structure, and plays a certain soft waterproof effect.

[0037] By setting the grouting pipe with closed two ends, needle holes and overflow holes, grouting can be carried out before initial setting, which plays a good waterproof role, provides pre-embedded equipment for later grouting, speeds up the repair progress, and enhances the waterproof effect after the first pouring.

[0038] The effective combination of the buffer concrete structure with the waterproof board, the grouting pipe and the rubber waterstop belt reduces the water seepage probability, prolongs the waterproof period and improves the repair convenience, and plays a certain anti-settling and waterproof reinforcing role. BRIEF DESCRIPTION OF DRAWINGS

[0039] The application will be further described below in combination with the drawings and examples, and the drawings will be described as follows.

[0040] Figure 1 is a structural diagram of a buffer structure for connecting new and old basements;

[0041] Figure 2 is a structural diagram of a waterproof plate;

[0042] Figure 3 is a structural diagram of a grouting pipe;

[0043] Figure 4 is a structural diagram of a buffer structure for connecting new and old basements and a connecting plane of new and old concretes;

[0044] In the figure: 1, new concrete; 2, old concrete; 3, buffer concrete structure; 4, flexible rubber waterstop; 5, waterproof plate; 6, grouting pipe; 7, concrete reinforcing area; 8, horizontal waterproof plate; 9, vertical waterproof plate; 10, rubber expansion waterstop structure; 11, rubber expansion waterstop material; 12, steel plate; 13, steel bar in the buffer concrete structure; 14, steel bar in the old concrete; 15, cushion layer; 16, construction joint; 17, grouting needle hole; 18, overflow hole; 19, closed end; 20, steel plate extension end; 21, steel bar hole; 22, fixed steel bar; 23, short horizontal steel bar. DETAILED DESCRIPTION

[0045] In order to make the objectives, technical solutions and advantages of the present application clearer, the present application is further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific examples described herein are only used to explain the present application and do not limit the present application.

[0046] Example 1

[0047] Reference Figures 1-4 A buffer structure for connecting new and old basements includes a buffer concrete structure 3, a flexible rubber waterstop 4, a waterproof plate 5, a grouting pipe 6 and a concrete reinforcing area 7. The buffer concrete structure 3 is disposed between new concrete 1 of a new basement and old concrete 2 of an old basement.

[0048] The buffer concrete structure 3 is connected to the new concrete 1 by the flexible rubber waterstop 4. The flexible rubber waterstop 4 is disposed horizontally, i.e. the flexible rubber waterstop 4 is perpendicular to the construction joint 16 of the buffer concrete structure 3 and the new concrete 1, and the flexible waterproof of the flexible rubber waterstop 4 can achieve good waterstop effect. In order to facilitate installation and achieve good waterproof effect, the flexible rubber waterstop 4 can be disposed between the upper and lower steel bars of the buffer concrete structure 3 and the new concrete 1.

[0049] The waterproof plate 5 is arranged between the buffer concrete structure 3 and the old concrete 2, and includes horizontal waterproof plates 8, vertical waterproof plates 9 and rubber expansion waterstop structures 10. The vertical waterproof plates 9 are connected with the horizontal waterproof plates 8 through the rubber expansion waterstop structures 10. In the embodiment, the horizontal waterproof plates 8 and the vertical waterproof plates 9 are both made of rubber expansion waterstop materials 11 (mixed with inorganic water-absorbing materials and high-viscosity resins) and 2mm-thick steel plates 12. The horizontal waterproof plates 8 are arranged below the buffer concrete structure 3 and the old concrete 2, and the upper surfaces of the horizontal waterproof plates 8 are flush with the upper surface of the cushion layer 15. The vertical waterproof plates 9 are arranged at construction joints 16 of the buffer concrete structure 3 and the old concrete 2, and effectively close the construction joints 16 of the buffer concrete structure 3 and the old concrete 2 to form a waterproof layer. The steel bars 14 (here, mainly the lower steel bars in the old concrete) in the old concrete pass through steel bar penetrating holes 21 in the rubber expansion waterstop structures 10 and are connected with the steel bars 13 in the buffer concrete structure. The upper ends of the steel plates 12 of the vertical waterproof plates 9 protrude from the rubber expansion waterstop materials 11, the protruding steel plates 12 (i.e. steel plate protruding ends 20) are connected with fixing steel bars 22 through short horizontal steel bars 23, and the fixing steel bars 22 are connected with the steel bars 14 in the old concrete. In the embodiment, the waterproof plate 5 extends in three directions, i.e. upward and two sides, and after being fixed, the waterproof plate 5 is poured with concrete to effectively close the construction joints 16 of the buffer concrete structure 3 and the old concrete 2 in the old basement plate area, so as to form a waterproof layer structure. The rubber expansion waterstop structures 10 are used for the horizontal and horizontal steel bars in the old concrete 2 to pass through, so that the whole structure is not easy to be disconnected.

[0050] The grouting pipe 6 is arranged on the top of the vertical waterproof plate 9 and is connected with the fixing steel bars 22 through the short horizontal steel bars 23. The grouting pipe 6 is provided with overflow holes 18 and grouting needle holes 17, and the two ends of the grouting pipe 6 are closed ends 19. The overflow holes 18 are used for injecting waterproof materials, the grouting needle holes 17 protrude from the buffer concrete structure 3 to facilitate the docking with a grouting machine, and the closed ends 19 are used for stopping flow and controlling the effective grouting range.

[0051] The concrete reinforcing area 7 has a horizontal cross section of 1m*0.5m and a depth of 50cm, and is arranged below the buffer concrete structure 3 and the old concrete 2. The concrete reinforcing area 7 is wrapped with the horizontal waterproof plates 8 and connects the buffer concrete structure 3 and the old concrete 2, and the upper surface of the concrete reinforcing area 7 is flush with the upper surface of the cushion layer 15, so as to prolong the water permeation path of the construction joints 16 of the buffer concrete structure 3 and the old concrete 2, thereby achieving a certain waterproof and structural reinforcing effect.

[0052] The rubber expansion waterstop material 11 is also called water-swelling waterstop belt.

[0053] Embodiment 2

[0054] A construction method for connecting a new basement to an old one uses the buffer structure for connecting the new and old basements described in Example 1. This method involves adding a buffer concrete structure 3 between the concrete of the new and old basements. One side of the buffer concrete structure 3 is connected to the new concrete 1 using a flexible rubber waterstop 4. The other side is connected to the old concrete 2 using a waterproof board 5. High-pressure grouting is then used to seal the construction joint 16 between the buffer concrete structure 3 and the old concrete 2, thereby preventing subsidence and providing waterproof reinforcement. The method primarily includes the following steps:

[0055] 1) Tie the reinforcement in the new basement slab (new concrete 1) area, leaving space for the later construction of the buffer concrete structure 3. Install a flexible rubber waterstop 4 at the joint, with one side inserted into the new basement area and the other side reserved for later pouring into the buffer concrete structure 3 for water stopping;

[0056] 2) Break up the old concrete in the old basement area, leaving a construction joint, and clean the joint;

[0057] 3) Excavate within the designed concrete reinforcement zone 7 to a depth of 50 cm and a width of 50 cm on both sides, forming a reinforcement zone with a cross-section of 1 m × 0.5 m. One side extends 50 cm into the bottom of the old concrete 2 of the old basement, and the other side is reserved for the reinforcement of the buffer concrete structure 3;

[0058] 4) pouring the new basement concrete and the cushion layer 15 under the buffer concrete structure 3 so that the cushion layer 15 is flush with the cushion layer 15 under the old concrete 2;

[0059] 5) Tie the steel bars 13 (upper and lower steel bars) in the buffer concrete structure, the structure of which is the same as the steel bar structure of the newly built basement concrete area; the upper steel bars in the old concrete 2 are directly connected to the upper steel bars in the buffer concrete structure 3, and the lower steel bars in the old concrete 2 are connected to the lower steel bars in the buffer concrete structure 3 after passing through the steel bar through-holes 21 on the rubber expansion water-stop structure 10 on the waterproof board 5; weld the fixed steel bars 22 so that the two ends of the fixed steel bars 22 are respectively connected to the upper and lower steel bars in the old concrete 2; a short horizontal steel bar 23 is horizontally selected from the middle position of the fixed steel bar 22, and the short horizontal steel bar 23 is connected to the steel plate 12 (steel plate protruding end 20) on the vertical waterproof board 9 that protrudes from the rubber expansion water-stop material 11, so that the waterproof board, buffer concrete structure 3, and old concrete 2 form a whole;

[0060] In this step, when the pure rubber expansion waterstop structure 10 of the waterproof plate 5 is connected to the protruding steel bars of the old concrete 2, three people need to operate simultaneously, two people control the height and position of the waterproof plate, and one person performs hot melting perforation. After the heating, the softened rubber expansion waterstop structure allows the steel bars to pass through and enter to form the steel bar perforation hole 21. After all the perforation is completed, the steel plate protruding end 20 of the waterproof plate 5 is positioned under the limited rubber deformation modulus, so that the lower horizontal waterproof plate 8 of the waterproof plate 5 can be closely attached to the old concrete 2 of the lower part of the old basement plate. Then, the steel plate protruding end 20 is welded and fixed with the horizontal steel bars (short horizontal steel bars 23) of the fixed steel bars 22. Finally, the steel bar perforation hole 21 is effectively bonded with the steel bars and the waterproof plate and the old concrete 2 by heating.

[0061] 6) The grouting pipe 6 is arranged at the top of the vertical waterproof plate 9 and connected with the short horizontal steel bars 23. The grouting pipe 6 has an overflow hole 18 opposite to the construction joint 16 between the old concrete 2 and the buffer concrete structure 3, so as to facilitate the later grouting repair.

[0062] 7) After all the structures are fixed, the concrete structure of the concrete reinforcing area 7 and the buffer concrete structure 3 is poured and vibrated to be compacted, so that the new and old concrete structures are effectively connected with the buffer concrete structure 3.

[0063] 8) Before the initial setting of the concrete, the epoxy polymer cement mortar is injected into the grouting needle hole 17. The mortar flows into the construction joint 16 through the grouting pipe 6 and the overflow hole 18 under high pressure, so as to seal the unvibrated gap and enhance the waterproof capacity.

[0064] 9) After pouring and grouting are completed, the film is sealed and maintained. At this time, the buffer concrete structure 3 and the concrete structure of the old basement are integrated, and the new basement concrete structure is combined with the buffer concrete structure 3 through the expansion joint of the flexible rubber waterstop belt 4. In the settlement process of the new basement, the soft waterproof of the flexible rubber waterstop belt 4 can achieve good waterproof effect, and the buffer concrete structure 3 is subjected to settlement buffering to avoid the settlement cracking of the construction joint of the old basement area.

[0065] If the construction joint 16 between the buffer concrete structure 3 and the old concrete 2 of the old basement plate cracks, high-pressure grouting can be directly performed on the grouting needle hole 17 for secondary grouting repair, which is convenient and fast.

[0066] The present application adds a buffer structure between the new and old basements to buffer and connect the connecting section of the new and old basements, so as to achieve the effects of anti-settlement and waterproof reinforcement and solve the connection problem of the new and old basements. After the new basement is poured and completed, the concrete of the buffer structure is poured, so that the buffer structure is separately opened and plays a role in settlement buffering between the new and old basements.

[0067] The application realizes the water stopping and structure reinforcing effect of the connection of new and old concrete, reduces the quality problems such as water seepage and cracks caused by direct pouring of the construction joint, is convenient to operate, and is suitable for the construction joint closing construction of new and old concrete areas.

[0068] It should be understood that, for those skilled in the art, modifications or changes can be made according to the above description, and all these modifications and changes shall belong to the protection scope of the appended claims of the application.

Claims

1. A buffer structure for a new to old basement connection, characterized by: The buffer concrete structure, the rubber waterstop, the waterproof board, the grouting pipe and the concrete reinforcing area are included. The buffer concrete structure is placed between the new concrete of the new basement and the old concrete of the old basement after the concrete pouring of the new basement is completed. The waterproof board is placed between the buffer concrete structure and the old concrete and includes horizontal waterproof boards and vertical waterproof boards. The horizontal waterproof boards are placed under the buffer concrete structure and the old concrete and have upper surfaces flush with the upper surface of the cushion layer. The vertical waterproof boards are placed at the construction joints of the buffer concrete structure and the old concrete, effectively close the construction joints, and form a waterproof layer.

2. The buffer structure for the new-old basement connection according to claim 1, characterized in that: The grouting pipe is placed on the vertical waterproof board and has overflow holes and grouting needle holes.

3. The buffer structure for the new-old basement connection according to claim 1, characterized in that: The concrete reinforcing area wraps the horizontal waterproof boards, connects the buffer concrete structure and the old concrete, and has an upper surface flush with the upper surface of the cushion layer.

4. The buffer structure for new-old basement connection according to claim 1, characterized in that: The upper end of the steel plate of the vertical waterproof board extends out of the rubber expansion waterproof material and is connected to the steel bars in the old concrete through the fixing steel bars.

5. The buffer structure for the new-old basement connection according to claim 4, characterized in that: The grouting pipe is connected to the fixing steel bars.

6. The buffer structure for connecting a new basement with an old basement according to claim 1, characterized in that: The rubber waterstop is arranged transversely and is perpendicular to the construction joints of the buffer concrete structure and the new concrete.

7. The buffer structure for new-old basement connection according to claim 1, characterized in that: The rubber waterstop is located between the upper and lower steel bars of the buffer concrete structure and the new concrete.

8. A method of constructing a new-to-old basement connection, characterized by: The horizontal cross section of the concrete reinforcing area is 1m x 0.5m and has a depth of 50cm.

9. The method of constructing a new-to-old basement connection of claim 8, wherein: The steel plate of the horizontal waterproof board and the vertical waterproof board is a 2mm steel plate.

10. The method of constructing a new-to-old basement connection of claim 9, wherein: The construction method uses the buffer structure for connecting the new and old basements according to any one of claims 1-7. The method adds a buffer concrete structure between the new and old basement concretes, connects the buffer concrete structure to the new concrete using a rubber waterstop on one side and connects the buffer concrete structure to the old concrete using a waterproof board on the other side, and uses high-pressure grouting to seal the construction joints of the buffer concrete structure and the old concrete, thereby achieving the effects of preventing settlement and waterproof reinforcement. The method includes the following steps: 1) binding the steel bars of the new basement concrete area, leaving a distance for the later construction of the buffer concrete structure, and arranging a rubber waterstop at the joint, with one side of the rubber waterstop inserted into the new basement concrete area and the other side reserved for later pouring into the buffer concrete structure for water stopping; 2) breaking the old basement concrete area, leaving a construction joint, and cleaning the joint; 3) excavating in the designed concrete reinforcing area, with an excavation depth of 50cm and an excavation width of 50cm on both sides, forming an area with a horizontal cross section of 1m x 0.5m and a depth of 50cm, with one side extending into the old basement concrete bottom by 50cm and the other side placed under the buffer concrete structure. 4) Pour the new basement concrete and cushion layer under the buffer concrete structure so that the cushion layer is flush with the cushion layer under the old concrete; 5) Tie the upper and lower layers of reinforcement within the buffer concrete structure, using the same structure as the reinforcement in the newly constructed basement concrete area. Connect the upper layer of reinforcement within the old concrete directly to the upper layer of reinforcement within the buffer concrete structure, and pass the lower layer of reinforcement within the old concrete through the holes in the rubber expansion waterstop on the waterproofing board and connect to the lower layer of reinforcement within the buffer concrete structure. Install fixed reinforcement, connecting both ends of the fixed reinforcement to the upper and lower layers of reinforcement within the old concrete. Extend a short horizontal reinforcement from the middle of the fixed reinforcement and connect it to the steel plate on the vertical waterproofing board that extends beyond the rubber expansion waterstop. 6) Install a grouting pipe on the top of the vertical waterproofing board and connect it to the short horizontal steel bar; the overflow hole on the grouting pipe should face the construction joint between the old concrete and the buffer concrete structure to facilitate grouting in the later stage; 7) Pour the concrete structure of the concrete reinforcement area and the buffer concrete structure area, vibrate and compact it to effectively connect the new and old concrete structures with the buffer concrete structure; 8) Before the concrete begins to set, start injecting epoxy polymer cement concrete mortar into the grouting pinhole. The mortar flows into the construction joint under high pressure through the grouting pipe and overflow hole, sealing the gaps that were not fully vibrated and enhancing its waterproof ability. 9) After pouring and grouting are completed, the membrane is sealed and maintained. At this time, the buffer concrete structure is integrated with the concrete structure of the old basement, and the new basement concrete structure and the buffer concrete structure are connected through the expansion joint of the rubber waterstop.

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