Raft post-cast strip repeatable grouting pipe

Abstract

The application discloses the technical fields of building construction and relates to a raft post-cast strip repeatable grouting pipe, which comprises a center pipe body, a plurality of groups of one-way blocking pieces which are uniformly distributed on the periphery of the center pipe body, and a plurality of groups of support parts, the plurality of groups of support parts are integrally formed along the outer peripheral surface of the center pipe body and are distributed at equal intervals, the support part, the center pipe body and the one-way blocking piece jointly enclose a plurality of transition cavities, a grouting communication hole which communicates the central main cavity and the transition cavity is formed in the center pipe body, a flushing cavity penetrates the support part in a direction parallel to the axis of the center pipe body, a flushing flow guide hole which communicates the flushing cavity and the transition cavity is formed in the support part, and a blocking part is arranged on the side wall of the support part and covers the flushing flow guide hole. The application solves the problem that flushing water cannot enter the area covered by the elastic rubber strip between the elastic rubber strip and the outer wall of the core pipe in the prior art, the residual slurry in the area is gradually accumulated, and the elastic rubber strip loses the rebound opening ability after the hydration and hardening.

Description

Technical Field

[0001] This invention relates to the field of building construction technology, and in particular to a re-grouting pipe for the post-cast strip of a raft foundation. Background Technology

[0002] In large-volume concrete projects such as basements, tunnels, subways, and water conservancy projects, construction joints and post-pouring strips are weak points in waterproofing. Pre-embedded reusable grouting pipes are typically used for sealing leaks. Typical reusable grouting pipes on the market include FUKO pipes and CCLL-D type maintainable grouting pipes. Their typical installation and maintenance steps include: cleaning the base surface and fixing the grouting pipes; connecting the grouting pipes using an overlapping method and securing them firmly; during grouting, selecting appropriate materials and slowly injecting from the lowest end under low pressure; if multiple grouting operations are required, using a vacuum pump or high-pressure water to clean the grouting pipes and sealing the ends.

[0003] The physical structure of this type of grouting pipe is typically as follows: the inner layer is a plastic or rubber core tube with regularly spaced grout outlets; the outer wall of the core tube is covered with an elastic rubber strip at the outlet as a one-way opening element; and the outermost layer is secured with a nylon braided mesh. During grouting, the grout is pumped in from one end of the core tube, enters the area covered by the elastic rubber strip between the elastic rubber strip and the outer wall of the core tube through the outlet, and then pushes open the elastic rubber strip to seep outwards into the construction joint.

[0004] After grouting is completed, according to the existing maintenance process, high-pressure water needs to be introduced from one end of the core tube or a vacuum pump needs to be used to try to remove the residual grout for reuse. However, since the flushing water or negative pressure suction can only flow axially along the internal channel of the core tube, the area covered by the elastic rubber strip between the elastic rubber strip and the outer wall of the core tube is actually closed from the outside by the elastic rubber strip and is only indirectly connected to the inside of the core tube through the grout outlet.

[0005] During flushing, water flows rapidly axially through the core tube. The slurry outlet is located at the bottom inner side of this area. The water flow cannot generate a sufficiently large lateral velocity or reverse pressure at the slurry outlet to enter the interior of this area, nor can it effectively flush away the residual slurry in this area. This area remains a closed dead zone that water cannot reach during the flushing process.

[0006] After each grouting, some grout remains in the area. Because existing maintenance methods cannot reach this area, the residual grout gradually accumulates, hydrates, and hardens, eventually bonding the elastic rubber strip to the outer wall of the core tube, causing the elastic rubber strip to completely lose its ability to rebound and open. During subsequent grouting, the pressure inside the core tube cannot push open the hardened elastic rubber strip, and the grout cannot diffuse outward, resulting in the grouting pipe effectively losing its function for repeated grouting.

[0007] Therefore, there is an urgent need for a raft slab post-cast strip re-grouting pipe that can effectively flush the area covered by the elastic rubber strip between the elastic rubber strip and the outer wall of the core tube. Summary of the Invention

[0008] The purpose of this invention is to address the problem in existing reusable grouting pipes where flushing water can only flow axially along the internal channel of the core tube and cannot enter the area covered by the elastic rubber strip between the elastic rubber strip and the outer wall of the core tube. This leads to the gradual accumulation of residual grout in this area, which, after hydration and hardening, bonds the elastic rubber strip to the outer wall of the core tube, causing the elastic rubber strip to lose its rebound and opening ability, and the grouting pipe to essentially lose its reusable grouting function. Therefore, this invention proposes a reusable grouting pipe for raft slab post-cast strips.

[0009] To achieve the above objectives, the present invention provides the following technical solution: a reusable grouting pipe for the post-cast strip of a raft foundation, comprising a central pipe body and multiple sets of unidirectional blocking plates evenly distributed around its outer periphery, and further comprising: Multiple sets of support parts are integrally formed along the outer circumferential surface of the central tube and are distributed at equal intervals. The support parts, the outer wall of the central tube, and the one-way blocking plate covering the outside of the support parts together form multiple transition cavities. The central tube is provided with a grouting communication hole that connects its central main cavity and the transition cavity. The flushing chamber extends through the support section in a direction parallel to the axis of the central tube. The support section has a flushing guide hole that connects the flushing chamber and the transition chamber. The barrier section is located on the side wall of the support section and covers the flushing guide hole. In the grouting state, the barrier section is squeezed by the grout in the transition cavity and fits against the side of the support section to block the flushing guide hole. In the flushing state, the barrier section is opened by the impact force of the water flow in the flushing cavity, so that the flushing water flows from the flushing cavity into the transition cavity and flows through the grouting connection hole to the central main cavity of the central pipe.

[0010] As a further description of the re-grouting pipe for the post-cast strip of the raft foundation, it also includes: The connector is assembled at the end of the central tube body. The connector includes a first flow guiding component and a second flow guiding component. The first flow guiding component is connected to the central main cavity of the central tube body, and the second flow guiding component is connected to the flushing cavity.

[0011] As a further description of the re-grouting pipe for the post-cast strip of the raft foundation: The barrier is a rubber sheet, one side of which is integrally formed with the central tube, and the other side extends outward and abuts against the inner surface of the one-way blocking sheet.

[0012] As a further description of the re-grouting pipe for the post-cast strip of the raft foundation: The thickness of the rubber sheet gradually decreases radially from the inside to the outside.

[0013] As a further description of the re-grouting pipe for the post-cast strip of the raft foundation: The support part has a slot for accommodating and limiting the one-way blocking piece, and the outer peripheral surface of the one-way blocking piece embedded in the slot is flush with the outer peripheral surface of the support part.

[0014] As a further description of the re-grouting pipe for the post-cast strip of the raft foundation: A braided sleeve is fitted on the outer peripheral surface of the one-way blocking plate and the outer peripheral surface of the support. The two ends of the braided sleeve are fixed to the one-way blocking plate and the support respectively by fasteners.

[0015] As a further description of the re-grouting pipe for the post-cast strip of the raft foundation: The first flow guiding assembly includes a grouting pipe, which is slidably inserted into the central main cavity of the central tube body. A baffle is fixed on the outer periphery of the grouting pipe to abut against the central tube body and the end of the one-way blocking plate.

[0016] As a further description of the re-grouting pipe for the post-cast strip of the raft foundation: The second diversion assembly includes a water storage box fixedly installed on one side of the baffle, and multiple water injection pipes fixed on the other side of the baffle for sliding insertion into the flushing chamber. The water injection pipes are connected to the inner cavity of the water storage box, and the outer periphery of the water storage box is connected to a connecting pipe.

[0017] As a further description of the re-grouting pipe for the post-cast strip of the raft foundation: The spacing between grouting connection holes on the same axis is 24mm-30mm, and the grouting connection holes connecting adjacent transition cavities are staggered in the axial direction.

[0018] As a further description of the re-grouting pipe for the post-cast strip of the raft foundation: The spacing between flushing guide holes on the same axis is 12mm-15mm, and the diameter of the flushing guide holes is 2mm-4mm.

[0019] In summary, due to the adoption of the aforementioned reusable grouting pipe for the post-cast strip of the raft foundation, the beneficial effects of this invention are: The grouting pipe fitting has a separate flushing chamber and an adjustable barrier between the flushing chamber and the grouting channel. During flushing, the barrier automatically responds to the pressure difference, and the water flow in the flushing chamber opens the flushing guide hole, allowing the flushing water to directly enter the transition chamber. This directly flushes the area covered by the elastic rubber strip between the elastic rubber strip and the outer wall of the core pipe. The flushed water then flows through the grouting connection hole to the central main cavity of the central pipe and is discharged. Combined with the dual-end inlet and dual-end outlet flushing mode, targeted cleaning of the area covered by the elastic rubber strip between the elastic rubber strip and the outer wall of the core pipe is achieved. The isolation and stable operation of the grouting and flushing channels allow the device to effectively remove residual grout in this area after grouting without replacement, preventing the elastic rubber strip from hardening and losing its rebound and opening ability. This significantly extends the service life and reusability of the grouting pipe, reducing construction and operating costs and resource consumption. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the overall structure of the repeatable grouting pipe for the post-cast strip of the raft foundation in an embodiment of the present invention; Figure 2 This is a schematic diagram showing the disassembly of the central tube and unidirectional blocking plate structure in an embodiment of the present invention; Figure 3 This is a front view of the end of the reusable grouting pipe structure of the raft slab post-cast strip in an embodiment of the present invention; Figure 4 This is a first cross-sectional view of the central tube, support, and unidirectional blocking plate structure in an embodiment of the present invention; Figure 5 This is a second cross-sectional view of the central tube, support, and unidirectional blocking plate structure in an embodiment of the present invention; Figure 6 This is a cross-sectional view of the connector structure of the repeatable grouting pipe in an embodiment of the present invention; Figure 7 This is a schematic diagram of the internal water flow direction during the rinsing state in an embodiment of the present invention.

[0021] Legend: 10. Central tube body; 11. One-way blocking plate; 12. Support part; 13. Transition cavity; 14. Grouting connection hole; 15. Flushing cavity; 16. Flushing guide hole; 17. Barrier part; 18. Slot; 19. Braided sleeve; 110. Fastener; 20. Connector; 201. First flow guide assembly; 2011. Grouting pipe; 2012. Baffle; 202. Second flow guide assembly; 2021. Water storage box; 2022. Water injection pipe; 2023. Connecting pipe. Detailed Implementation

[0022] The following will describe, with reference to the accompanying drawings of the embodiments of the present invention, a repeatable grouting pipe for post-cast strip of raft foundation according to the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0023] like Figures 1-7 As shown, the reusable grouting pipe for the post-cast strip of the raft foundation provided by the present invention includes a central pipe body 10 and multiple sets of unidirectional blocking plates 11 evenly distributed around its outer periphery. Both the central pipe body 10 and the unidirectional blocking plates 11 can be made of elastic rubber material. The grouting and sealing device also includes components such as a support part 12, a flushing chamber 15, and a barrier part 17. A braided sleeve 19 is fitted on the outer peripheral surface of the unidirectional blocking plate 11 and the outer peripheral surface of the support part 12. The two ends of the braided sleeve 19 are respectively fixed to the unidirectional blocking plate 11 and the support part 12 by fasteners 110, which can be made of sealant. The belt includes multiple sets of support parts 12 integrally formed along the outer peripheral surface of the central tube 10 and distributed at equal intervals. The support parts 12, the outer wall of the central tube 10, and the one-way blocking piece 11 covering the outside of the support parts 12 together form multiple transition cavities 13. The central tube 10 is provided with a grouting communication hole 14 connecting its central main cavity and the transition cavity 13. The flushing cavity 15 penetrates the support part 12 in a direction parallel to the axis of the central tube 10. The support part 12 is provided with a flushing guide hole 16 connecting the flushing cavity 15 and the transition cavity 13.

[0024] A barrier 17 is disposed on the side wall of the support 12 and covers the flushing guide hole 16. In the grouting state, the barrier 17 is squeezed by the grout in the transition chamber 13 and adheres to the side of the support 12 to block the flushing guide hole 16. In the flushing state, the barrier 17 is opened by the impact force of the water flow in the flushing chamber 15, so that the flushing water flows from the flushing chamber 15 into the transition chamber 13 and flows through the grouting connection hole 14 to the central main cavity of the central tube 10. To enable the device to connect with the external grouting hose and water injection hose, the grouting and sealing device also includes a connector 20. The connector 20 is assembled at the end of the central tube 10. The connector 20 includes a first guide component 201 and a second guide component 202. The first guide component 201 connects to the central main cavity of the central tube 10, and the second guide component 202 connects to the flushing chamber 15.

[0025] Before laying the grouting sealing device, clean the area within 30mm of the grouting pipe. Use waterproof mortar to roughly level any pits. Lay the grouting pipe according to the design requirements, ensuring a straight and vertical path with minimal bends. If a straight pipe layout cannot meet these requirements, the pipe can be laid vertically along the construction joint. The turning radius of the device should not be less than 150mm, and turns should be gentle without sharp angles. Install the corresponding grouting sealing device in the post-cast strip requiring later sealing, following the above construction method.

[0026] In actual use, when the operator injects high-pressure grout into the central main cavity of the central tube 10 through the first flow guide component 201, one end of the central main cavity of the central tube 10 is connected for grouting, while the other end is sealed. The grout flows into each transition cavity 13 through the grouting connection hole 14. At this time, the grout pressure in the transition cavity 13 can evenly overcome the binding force of the braided sleeve 19 and the elastic recovery force of the one-way blocking plate 11, driving the one-way blocking plate 11 and the braided sleeve 19 to deform radially outward, so that their outer periphery is tightly attached to the side wall of the crack in the post-cast strip. The grout penetrates into the crack in the post-cast strip through the gap formed between the one-way blocking plate 11 and the support part 12 after being stretched, which can achieve the full-section, blind-zone-free grout filling and leak-stopping effect of the post-cast strip. Under the action of the pressure in the transition cavity 13, the elastic material barrier part 17 is pressed tightly against the side of the support part 12, completely covering and sealing the flushing guide hole 16. This effectively prevents the grout from entering the flushing chamber 15, ensuring that the grouting pressure can be applied efficiently to the sealing area.

[0027] After grouting is completed, the inside of the pipe is flushed before the grout solidifies. Operators can introduce high-pressure flushing water into the flushing chamber 15 through the second guide assembly 202. The second guide assemblies 202 at both ends of the device are connected to external water supply components, allowing high-pressure flushing water to be simultaneously introduced into the flushing chamber 15 from both ends of the device, while the two ends of the central main cavity of the central pipe 10 remain unobstructed. During flushing, the high-pressure flushing water flows onto the back of the barrier 17. When the pressure on this side exceeds the residual pressure in the transition chamber 13 and the pre-tightening force of the barrier 17 itself, the barrier 17 undergoes elastic displacement, thereby opening the flushing guide hole 16. Figure 7 As shown in the water flow direction, the flushing water flows into the transition chamber 13 through the flushing guide hole 16, flushing away the residual slurry that has not completely solidified or accumulated in the transition chamber 13 and the grouting connection hole 14. The diluted residue is carried back to the central main chamber of the central tube 10 through the grouting connection hole 14, and finally discharged to the outside of the device through both ends of the central main chamber.

[0028] Through the coordinated elastic deformation of the central tube 10, the elastic unidirectional blocking plate 11, and the braided sleeve 19, this device can achieve dynamic compensation and adaptive sealing based on the inner wall morphology of the post-cast strip, ensuring that the grout achieves a leak-stopping effect with no blind spots and a high filling rate across the entire cross-section. Furthermore, the device utilizes the blocking part 17 to adaptively adjust under the action of grouting pressure and flushing water force, realizing automatic switching between the grouting channel and the flushing channel. This eliminates the need for complex manual mechanical linkages, ensuring pressure stability during grouting and avoiding the risk of grout backflow into the flushing chamber, greatly improving the system's operational safety. Simultaneously, the device completely overcomes the limitation of traditional grouting devices that share the same channel for grouting and flushing. Through the circulation and unblocking of the grouting path by high-pressure water flow, the device possesses excellent reusability potential, significantly reducing construction and operating costs and resource waste while significantly improving the operational efficiency and long-term reliability of grouting projects in complex environments.

[0029] In one embodiment, such as Figures 3-7 As shown, the barrier 17 is a rubber sheet. One side of the rubber sheet is integrally formed with the central tube 10, and the other side extends outward and abuts against the inner surface of the one-way blocking plate 11. The cross-sectional thickness of the rubber sheet gradually decreases from the inside to the outside along the radial direction. The barrier 17 adopts a rubber sheet structure with a cross-sectional thickness that gradually decreases from the inside to the outside, resulting in a larger thickness in the root region where the rubber sheet is integrally formed with the central tube 10. This provides a stable structural support, ensuring that it is not prone to breakage when subjected to high-pressure slurry scouring. The outer edge region of the rubber sheet, away from the central tube 10, is thinner and has a relatively lower elastic modulus. It is sensitive to pressure difference and is easily bent by water flow impact to guide the flow.

[0030] Furthermore, when the high-pressure flushing water enters the flushing chamber 15 and impacts the barrier 17, the outer edge region with a gradually thinning cross-section undergoes outward elastic bending under water pressure. This bending action not only opens the flushing guide hole 16, but the guiding surface formed by the bending also precisely guides the high-pressure flushing water flow to the gap between the one-way blocking plate 11 and the support 12. Due to the structural arrangement of the barrier 17 and the support 12, the refracting direction of the bent surface of the opened rubber sheet points to this gap region, thereby enabling the flushing water flow to forcefully flush this critical part, effectively preventing the slurry from solidifying and accumulating at the connection interface between the one-way blocking plate 11 and the support 12. This ensures that each moving part can maintain good elastic response and reset performance after multiple grouting cycles, achieving comprehensive maintenance from channel unblocking to local cleaning.

[0031] In one embodiment, such as Figure 1 and Figure 6As shown, specifically, the first flow guiding assembly 201 includes a grouting pipe 2011, which is slidably inserted into the central main cavity of the central pipe body 10. A baffle 2012 is fixed to the outer periphery of the grouting pipe 2011 for abutting against the central pipe body 10 and the end of the one-way blocking plate 11. Specifically, the second flow guiding assembly 202 includes a water storage box 2021 fixedly installed on one side of the baffle 2012. Multiple water injection pipes 2022 are fixed to the other side of the baffle 2012 for slidably inserted into the flushing chamber 15. The water injection pipes 2022 communicate with the inner cavity of the water storage box 2021, and a connecting pipe 2023 communicates with the outer periphery of the water storage box 2021.

[0032] The end of the grouting pipe 2011 furthest from the central pipe 10 can be inserted into a grouting hose, and the connecting pipe 2023 can be inserted into a water supply hose. The water inlet hose and the grouting hose are set separately so that when the device is flushed, the water inlet hose connected at both ends of the device can pressurize and supply water into it at the same time, while the grouting hose connected at both ends of the device can discharge the grout accumulated inside the device. After the water inlet hose and the grouting hose are installed, their ends protrude above the ground. A plug can be inserted into the end of the hose protruding above the ground so that it can be opened when the device is subsequently grouted and flushed.

[0033] The unidirectional blocking plate 11 is assembled with the central tube 10. The support part 12 has a slot 18 for accommodating and limiting the unidirectional blocking plate 11. The outer peripheral surface of the unidirectional blocking plate 11, which is embedded in the slot 18, is flush with the outer peripheral surface of the support part 12. The slot 18 provides a predetermined installation reference and spatial constraint for the unidirectional blocking plate 11. Through the radial limiting of the slot wall, it is ensured that the unidirectional blocking plate 11 will not shift, flip, or fall off when subjected to complex grouting pressure or flushing pressure, thus maintaining the stability of the structural assembly. The entire device forms a continuous and smooth cylindrical outline in the circumferential direction, eliminating stepped structural abrupt changes. The equal outer diameter design of the outer peripheral surface effectively reduces the flow resistance of the device in the gap within the post-pouring strip. Under the wrapping of the braided sleeve 19, due to the consistency of the outer diameter of the device, the grouting pressure can be evenly applied to the outer wall of the sleeve, avoiding excessive wear of the sleeve or uneven grout flow caused by local contour abrupt changes, and ensuring the uniform distribution of grouting pressure in the circumferential direction.

[0034] The overall inner diameter of the grouting and sealing device can be 8mm or 10mm, and the outer diameter can be 24mm or 26mm. The spacing between the grouting connecting holes 14 on the same axis is 24mm-30mm, and the grouting connecting holes 14 connecting adjacent transition chambers 13 are staggered in the axial direction to ensure uniform grout discharge from the outer periphery of the device during grouting. The spacing between the flushing guide holes 16 on the same axis is 12mm-15mm, and the diameter of the flushing guide holes 16 is 4mm-6mm, which facilitates efficient flushing of the inside of the device.

[0035] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any equivalent substitutions or modifications made by those skilled in the art within the scope of the technology disclosed in the present invention, based on the technology and inventive concept of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A reusable grouting pipe for post-cast strip of raft foundation, comprising a central pipe body (10), characterized in that: Multiple sets of unidirectional blocking plates (11) are evenly distributed around the outer periphery of the central tube (10), and also include Multiple sets of support parts (12) are integrally formed along the outer peripheral surface of the central tube (10) and are distributed at equal intervals. The support parts (12), the outer wall of the central tube (10) and the one-way blocking piece (11) covering the outside of the support parts (12) together form multiple transition cavities (13). The central tube (10) is provided with a grouting communication hole (14) that connects its central main cavity and the transition cavity (13). The flushing chamber (15) extends through the support part (12) in a direction parallel to the axis of the central tube (10). The support part (12) is provided with a flushing guide hole (16) that connects the flushing chamber (15) and the transition chamber (13). The barrier (17) is provided on the side wall of the support (12) and covers the flushing guide hole (16). In the grouting state, the barrier (17) is squeezed by the grout in the transition cavity (13) and adheres to the side of the support (12) to block the flushing guide hole (16). In the flushing state, the barrier (17) is opened by the impact force of the water flow in the flushing cavity (15), so that the flushing water flows from the flushing cavity (15) into the transition cavity (13) and flows through the grouting connecting hole (14) to the central main cavity of the central pipe (10). The barrier (17) is made of elastic material.

2. The reusable grouting pipe for post-cast strip of raft foundation according to claim 1, characterized in that, Also includes: The connector (20) is assembled at the end of the central tube (10). The connector (20) includes a first flow guide assembly (201) and a second flow guide assembly (202). The first flow guide assembly (201) is connected to the central main cavity of the central tube (10), and the second flow guide assembly (202) is connected to the flushing cavity (15).

3. A reusable grouting pipe for post-cast strip of raft foundation according to claim 2, characterized in that: The barrier part (17) is a rubber sheet. One side of the rubber sheet is integrally formed with the central tube (10), and the other side extends outward and abuts against the inner surface of the one-way blocking sheet (11).

4. A reusable grouting pipe for post-cast strip of raft foundation according to claim 3, characterized in that: The thickness of the rubber sheet gradually decreases radially from the inside to the outside.

5. A reusable grouting pipe for post-cast strip of raft foundation according to claim 2, characterized in that: The support part (12) has a slot (18) for accommodating and limiting the one-way blocking piece (11), and the outer peripheral surface of the one-way blocking piece (11) embedded in the slot (18) is flush with the outer peripheral surface of the support part (12).

6. A reusable grouting pipe for post-cast strip of raft foundation according to claim 5, characterized in that: A braided sleeve (19) is fitted on the outer peripheral surface of the one-way blocking plate (11) and the outer peripheral surface of the support part (12). The two ends of the braided sleeve (19) are fixed to the one-way blocking plate (11) and the support part (12) respectively by fasteners (110).

7. A reusable grouting pipe for post-cast strip of raft foundation according to claim 2, characterized in that: The first flow guiding assembly (201) includes a grouting pipe (2011), which is slidably inserted into the central main cavity of the central tube body (10). A baffle (2012) is fixed on the outer periphery of the grouting pipe (2011) for abutting against the end of the central tube body (10) and the one-way blocking plate (11).

8. A reusable grouting pipe for post-cast strip of raft foundation according to claim 5, characterized in that: The second diversion assembly (202) includes a water storage box (2021) fixedly installed on one side of the baffle (2012), and multiple water injection pipes (2022) fixed on the other side of the baffle (2012) for sliding insertion into the flushing chamber (15). The water injection pipes (2022) are connected to the inner cavity of the water storage box (2021), and the outer periphery of the water storage box (2021) is connected to a connecting pipe (2023).

9. A reusable grouting pipe for post-cast strip of raft foundation according to claim 5, characterized in that: The spacing between the grouting connection holes (14) on the same axis is 24mm-30mm, and the grouting connection holes (14) connecting adjacent transition cavities (13) are staggered in the axial direction.

10. A reusable grouting pipe for post-cast strip of raft foundation according to claim 5, characterized in that: The spacing between the flushing guide holes (16) on the same axis is 12mm-15mm, and the diameter of the flushing guide holes (16) is 2mm-4mm.

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