Grouting method for pre-reserved water-stop groove in the bottom plate of the immersed tube

Abstract

This invention discloses a grouting method for pre-reserved water-stop grooves in the force transmission plate of an immersed tunnel base plate, belonging to the field of immersed tunnel construction technology. The method includes: before filling the dry dock with water, multiple Q-shaped waterstops are installed transversely along the tunnel section on the force transmission plate. These Q-shaped waterstops are arranged parallel to each other along the tunnel section's axial direction, forming pre-reserved water-stop grooves between adjacent Q-shaped waterstops; each pre-reserved water-stop groove is divided into at least one grouting zone along the tunnel section's transverse direction, and a grouting pipe is installed correspondingly in each grouting zone. The pre-embedded section of the grouting pipe is fixed to the force transmission plate and is parallel to the Q-shaped waterstops; after the final joint end tunnel section is installed, an air injection test is performed on the grouting pipe to ensure permeability; grouting is performed sequentially according to the preset grouting sequence of the pre-reserved water-stop grooves, completing the grouting in each pre-reserved water-stop groove according to the preset grouting zone grouting sequence. The grouting method for pre-reserved water-stop grooves in the force transmission plate of an immersed tunnel base plate provided by this invention can improve waterproofing reliability and ensure long-term waterproofing durability and construction quality.

Description

Technical Field

[0001] This invention belongs to the field of immersed tunnel construction technology, and in particular relates to a grouting method for pre-reserved water-stop grooves in the force transmission plate of the immersed tunnel bottom plate. Background Technology

[0002] In immersed tunnel construction, the water-stopping joint between the immersed tunnel sections and the land-based force transfer plate is a crucial step in ensuring the quality of waterproofing. Currently, the industry commonly uses Q-type waterstops installed on the force transfer plate for water stoppage. However, this traditional construction method has significant drawbacks: Firstly, insufficient installation precision and improper construction procedures can easily lead to the failure of the waterstop's waterproofing function. Furthermore, once leakage occurs, traditional repair methods require structural removal or drilling for grouting, which is complex, costly, and ineffective. Secondly, in complex engineering environments (such as at expansion joints, construction joints, or in scenarios involving subsequent siltation), the lack of effective gaps between waterstops can easily clog grouting channels, severely affecting the grouting reinforcement effect and failing to meet long-term waterproofing durability requirements. Therefore, a grouting method that can improve waterproofing reliability is urgently needed. Summary of the Invention

[0003] In view of the shortcomings of the related technologies, the purpose of this invention is to provide a grouting method for the pre-reserved water-stop groove of the force transmission plate of the immersed tube bottom plate, so as to solve the problems mentioned in the background technology.

[0004] To achieve the above objectives, the present invention provides the following technical solution:

[0005] A grouting method for pre-reserved water-stop grooves in the force transmission plate of a submerged pipe bottom slab includes the following steps:

[0006] S1. Before filling the dry dock with water, multiple Q-type waterstops are fixedly installed on the force transmission plate at the bottom plate position of the pipe section at the final joint end, along the transverse direction of the pipe section. The multiple Q-type waterstops are arranged in parallel along the axial direction of the pipe section, and a reserved waterstop groove is formed between adjacent Q-type waterstops.

[0007] S2. Divide each reserved water-stop groove into at least one grouting zone along the transverse direction of the pipe section. Set a grouting pipe in each grouting zone. The embedded section of the grouting pipe is fixed to the force transmission plate and the embedded section of the grouting pipe is parallel to the Q-type water-stop.

[0008] S3. After the final joint end pipe section is installed, an air injection test is carried out on all grouting pipes to check the permeability of the grouting pipes.

[0009] S4. Grouting is carried out sequentially according to the preset grouting sequence of the reserved water stop groove. In each reserved water stop groove, grouting is completed sequentially according to the preset grouting zone grouting sequence.

[0010] In some embodiments, the reserved water-stop groove includes a water-stop groove away from the dry dock side and a water-stop groove near the dry dock side. The water-stop groove near the dry dock side is located at the bottom of the box-shaped steel beam structure where the final joint end pipe section is installed. The number of grouting sections near the dry dock side is greater than the number of grouting sections away from the dry dock side.

[0011] In some embodiments, the preset grouting sequence of the reserved water-stop groove is to grout sequentially from the side away from the dry dock to the side closer to the dry dock; within each reserved water-stop groove, the preset grouting zone grouting sequence is to grout sequentially from the same end of each reserved water-stop groove to the other end.

[0012] In some embodiments, the grouting connection method of each grouting section in each reserved water stop groove is as follows: when the grouting pressure of the current grouting section reaches the preset pressure threshold, the grouting of the grouting section is stopped, and the grouting operation of the next grouting section is started, until all grouting sections in the reserved water stop groove are grouted, and the preset pressure threshold is not lower than the upper limit of the grouting working pressure.

[0013] In some embodiments, the length of the grouting pipe corresponding to each grouting zone in each reserved water-stop groove is different. The length of the grouting pipe is adapted to the distance between its corresponding grouting zone and the grouting end, so that the grouting material can be uniformly and densely filled into the corresponding grouting zone.

[0014] In some embodiments, the gas injection test specifically includes:

[0015] S31. Close the sealing structure at the end of the grouting pipe to form an independent and sealed channel inside the grouting pipe;

[0016] S32. Compressed air is introduced into the grouting pipe through an air injection device, and the test pressure is set to be no less than 1.2 times the subsequent grouting working pressure;

[0017] S33. After pressurizing to the set test pressure, stop the gas supply and maintain the pressure for no less than 3 minutes, during which time the pressure changes are monitored in real time.

[0018] S34. If the pressure drop does not exceed the preset allowable range during the pressure holding period, the grouting pipe is deemed to be of acceptable permeability.

[0019] In some embodiments, the grouting pipe has a two-section structure, including a seamless steel pipe section fixed to the force transmission plate and located in the reserved water-stop groove area, and a high-pressure rubber pipe section extending out of the ground and used to connect to the grouting machine. The seamless steel pipe section and the high-pressure rubber pipe section are fixedly connected by a sealing joint.

[0020] In some embodiments, a check valve is provided at the end of the seamless steel pipe section of the grouting pipe away from the high-pressure rubber pipe section. The flow direction of the check valve is consistent with the grouting direction. The check valve is used to prevent the grouting material, silt and external debris in the reserved water-stop groove from flowing back into the grouting pipe.

[0021] In some embodiments, the seamless steel pipe section has a diameter of 30 mm and a wall thickness of 2 mm, the high-pressure rubber pipe section has a diameter of 50 mm, and the rated pressure resistance of the high-pressure rubber pipe section is not less than 1.5 times the grouting working pressure.

[0022] In some embodiments, the high-pressure rubber hose section emerges from the ground and extends to the top of the diaphragm wall.

[0023] Compared with the prior art, the beneficial effects of the present invention are:

[0024] 1. The grouting method for the pre-reserved water-stop groove of the force transmission plate of the immersed tube bottom plate provided by the present invention forms the pre-reserved water-stop groove by arranging Q-type water-stop strips and designs grouting zones differently as needed. For the pre-reserved water-stop groove at the bottom of the structure near the dry dock side, more grouting zones are divided. Combined with the precise matching of the grouting pipe length and the distance between the grouting zones, uniform and dense filling of grouting can be achieved, which significantly improves the waterproofing reliability and enhances the long-term waterproofing durability.

[0025] 2. The grouting method for the pre-reserved water-stop groove of the submerged pipe bottom plate force transmission plate provided by the present invention standardizes the grouting sequence of the pre-reserved water-stop groove and the grouting sequence of the grouting zones, and combines it with the pressure connection logic of switching to the next grouting zone when the grouting pressure of the current grouting zone reaches the preset pressure threshold. This avoids cross-interference of grouting, improves the efficiency of construction flow, and ensures that each zone is fully grouted without gaps. It takes into account both construction efficiency and waterproofing quality, and is suitable for high-precision waterproofing construction scenarios at the force transmission plate of the submerged pipe bottom plate.

[0026] 3. The grouting method for the pre-reserved water-stop groove of the submerged pipe bottom plate force transmission plate provided by the present invention, through the anti-clogging design of the check valve of the grouting pipe and the combination of the two-section structure: the check valve can directly block the backflow of silt, debris blockage and grouting material backflow. In the two-section structure, the seamless steel pipe section is firmly fixed in the water-stop groove area of ​​the force transmission plate, and the high-pressure rubber pipe section is exposed, which can be easily connected to the grouting machine. This not only avoids damage to the grouting channel during construction, but also strengthens the anti-clogging protection, providing double protection for the long-term unobstructed grouting channel and ensuring the smooth progress of subsequent grouting. Attached Figure Description

[0027] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this application, illustrate exemplary embodiments of the invention and, together with their description, serve to explain the invention and do not constitute an undue limitation thereof. In the drawings:

[0028] Figure 1This is a flowchart illustrating an embodiment of the grouting method for the pre-reserved water-stop groove in the force transmission plate of the immersed tube bottom plate according to the present invention.

[0029] Figure 2 This is a longitudinal section diagram of the Q-type waterstop arrangement of an embodiment of the grouting method for the pre-reserved waterstop groove in the force transmission plate of the immersed tube bottom plate of the present invention.

[0030] Figure 3 for Figure 2 Enlarged view of point A in the middle;

[0031] Figure 4 A top view of the Q-type waterstop arrangement in an embodiment of the grouting method for the pre-reserved waterstop groove in the force transmission plate of the immersed tube bottom plate of the present invention;

[0032] Figure 5 This is a schematic diagram of a two-section connection structure of the grouting pipe in an embodiment of the grouting method for pre-reserved water-stop groove in the force transmission plate of the immersed tube bottom plate of the present invention.

[0033] Figure 6 This is a schematic diagram of the grouting process for the first reserved water-stop groove in an embodiment of the grouting method for the reserved water-stop groove of the force transmission plate of the immersed tube bottom plate of the present invention.

[0034] Figure 7 for Figure 6 Enlarged view of point B in the middle;

[0035] Figure 8 This is a schematic diagram of the grouting process for the second reserved water stop groove in an embodiment of the grouting method for the reserved water stop groove of the force transmission plate of the immersed tube bottom plate of the present invention.

[0036] Figure 9 This is a schematic diagram of the grouting process for the third reserved water stop groove in an embodiment of the grouting method for the reserved water stop groove of the force transmission plate of the immersed tube bottom plate of the present invention.

[0037] Figure 10 This is a schematic diagram of the grouting process for the fourth reserved water stop groove in an embodiment of the grouting method for the reserved water stop groove of the force transmission plate of the immersed tube bottom plate of the present invention.

[0038] In the picture:

[0039] 1. Q-type waterstop;

[0040] 11. First Q-type waterstop; 12. Second Q-type waterstop; 13. Third Q-type waterstop; 14. Fourth Q-type waterstop;

[0041] 2. Reserve a water-stop groove;

[0042] 21. First reserved water-stop groove; 22. Second reserved water-stop groove; 23. Third reserved water-stop groove; 24. Fourth reserved water-stop groove;

[0043] 3211, First grouting zone; 3212, Second grouting zone; 3213, Third grouting zone;

[0044] 3221, Fourth grouting zone; 3222, Fifth grouting zone; 3223, Sixth grouting zone;

[0045] 3231, Seventh Grouting Section; 3232, Eighth Grouting Section; 3233, Ninth Grouting Section; 3234, Tenth Grouting Section;

[0046] 3241, Eleventh Grouting Zone; 3242, Twelfth Grouting Zone; 3243, Thirteenth Grouting Zone; 3244, Fourteenth Grouting Zone;

[0047] 4. Grouting pipe; 41. Seamless steel pipe section; 42. High-pressure rubber hose section;

[0048] 4211, First grouting pipe; 4212, Second grouting pipe; 4213, Third grouting pipe;

[0049] 4221, Fourth grouting pipe; 4222, Fifth grouting pipe; 4223, Sixth grouting pipe;

[0050] 4231, Seventh grouting pipe; 4232, Eighth grouting pipe; 4233, Ninth grouting pipe; 4234, Tenth grouting pipe;

[0051] 4241, Eleventh grouting pipe; 4242, Twelfth grouting pipe; 4243, Thirteenth grouting pipe; 4244, Fourteenth grouting pipe;

[0052] 5. Final joint end pipe section; 6. Force transmission plate; 7. Diaphragm wall; 8. Dry dock; 9. Box steel beam structure. Detailed Implementation

[0053] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present invention, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0054] In the description of this invention, it should be understood that the terms "center", "lateral", "longitudinal", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0055] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention based on the specific circumstances.

[0056] Example 1:

[0057] See appendix Figures 1 to 10 This paper provides an illustrative embodiment of the grouting method for the pre-reserved water-stop groove in the force transmission plate of the immersed tube bottom plate proposed in this invention. The grouting method for the pre-reserved water-stop groove in the force transmission plate of the immersed tube bottom plate includes the following steps:

[0058] S1. Before filling the dry dock 8 with water, multiple Q-type waterstops 1 are fixedly installed on the force transmission plate 6 at the bottom plate position of the final joint end pipe section 5 along the transverse direction of the pipe section. The multiple Q-type waterstops 1 are arranged in parallel along the axial direction of the pipe section, and a reserved waterstop groove 2 is formed between adjacent Q-type waterstops 1.

[0059] S2. Divide each reserved water-stop groove 2 into at least one grouting zone along the transverse direction of the pipe section. Set a grouting pipe 4 in each grouting zone. The embedded section of the grouting pipe 4 is fixed on the force transmission plate 6 and the embedded section of the grouting pipe 4 is parallel to the Q-type water-stop 1.

[0060] S3. After the final joint end pipe section 5 is installed, an air injection test is carried out on all grouting pipes 4 to check the permeability of the grouting pipes 4.

[0061] S4. Grouting is carried out sequentially according to the preset grouting sequence of the reserved water stop groove 2. In each reserved water stop groove 2, grouting is carried out sequentially according to the preset grouting zone grouting sequence.

[0062] In step S1, see Appendix Figure 2 and Figure 3 In this embodiment, before the dry dock 8 is filled with water, four Q-type waterstops 1 are fixedly installed laterally along the pipe section 5 on the force transmission plate 6 at the bottom plate position of the final joint end pipe section 5. These are the first Q-type waterstop 11, the second Q-type waterstop 12, the third Q-type waterstop 13, and the fourth Q-type waterstop 14. Pre-reserved waterstop grooves 2 are formed between adjacent Q-type waterstops 1. Specifically, the first pre-reserved waterstop groove 21 is formed between the first Q-type waterstop 11 and the second Q-type waterstop 12, the second pre-reserved waterstop groove 22 is formed between the second Q-type waterstop 12 and the third Q-type waterstop 13, the third pre-reserved waterstop groove 23 is formed between the third Q-type waterstop 13 and the fourth Q-type waterstop 14, and the fourth pre-reserved waterstop groove 24 is formed between the fourth Q-type waterstop 14 and the water-facing edge of the dry dock.

[0063] By arranging Q-type waterstops 1 laterally along the pipe section and parallel to each other along the axial direction, it is possible to ensure that the reserved waterstop grooves 2 with uniform gaps and continuous axial direction are formed between adjacent Q-type waterstops 1, so as to achieve full coverage of the waterproof gaps in the force transmission plate 6 area without any waterproof blind spots. At the same time, the elastic sealing characteristics of the Q-type waterstops 1 themselves can provide a good sealing foundation for subsequent grouting and filling, reduce the risk of leakage of grouting materials, and complete the fixing of the Q-type waterstops 1 before the final joint end pipe section 5 is installed, which can avoid installation errors caused by limited construction space in the later stage and ensure the forming accuracy of the reserved waterstop grooves 2.

[0064] The reserved water-stop groove 2 includes a water-stop groove away from the dry dock and a water-stop groove near the dry dock. The water-stop groove near the dry dock is located at the bottom of the box-type steel beam structure 9 for the final joint end pipe section installation. The number of grouting zones near the dry dock is greater than the number of grouting zones away from the dry dock.

[0065] In this embodiment, the first reserved water-stop groove 21 and the second reserved water-stop groove 22 are water-stop grooves away from the dry dock side, while the third reserved water-stop groove 23 and the fourth reserved water-stop groove 24 are water-stop grooves close to the dry dock side. The third reserved water-stop groove 23 and the fourth reserved water-stop groove 24 are located at the bottom of the box-type steel beam structure 9 for the final joint end pipe section installation. The first reserved water-stop groove 21 and the second reserved water-stop groove 22 are each provided with three grouting zones; the first reserved water-stop groove 21 includes a first grouting zone 3211, a second grouting zone 3212 and a third grouting zone 3213; the second reserved water-stop groove 22 includes a fourth grouting zone 3221, a fifth grouting zone 3222 and a sixth grouting zone 3223. The third reserved water-stop groove 23 and the fourth reserved water-stop groove 24 are each provided with four grouting zones; the third reserved water-stop groove 23 includes the seventh grouting zone 3231, the eighth grouting zone 3232, the ninth grouting zone 3233 and the tenth grouting zone 3234; the fourth reserved water-stop groove 24 includes the eleventh grouting zone 3241, the twelfth grouting zone 3242, the thirteenth grouting zone 3243 and the fourteenth grouting zone 3244.

[0066] By adopting this differentiated zoning setting to adapt to actual waterproofing needs: for the third reserved waterstop groove 23 and the fourth reserved waterstop groove 24, which are close to the dry dock side and located at the bottom of the box-type steel beam structure 9 (a key part with higher waterproofing requirements), grouting zones are added. This allows the grouting material to fill the gaps in the waterstop grooves more evenly, avoiding problems such as local hollow areas and incomplete filling, and effectively enhancing the waterproofing reliability of this core area. On the other hand, for the first reserved waterstop groove 21 and the second reserved waterstop groove 22, which have relatively lower waterproofing requirements, fewer grouting zones are used. This simplifies the construction process and improves the efficiency of construction flow while ensuring the basic waterproofing effect, achieving a reasonable balance between waterproofing quality and construction efficiency.

[0067] The preset grouting sequence of the reserved water stop groove 2 is to advance the grouting from the side away from the dry dock to the side closer to the dry dock; within each reserved water stop groove 2, the preset grouting sequence of the grouting zone is to uniformly start from the same end of each reserved water stop groove 2 and grout in a unidirectional direction from the starting end to the other end, so as to ensure that the grouting flow direction of all reserved water stop grooves 2 is consistent.

[0068] In this embodiment, since the first reserved water-stop groove 21 and the second reserved water-stop groove 22 are water-stop grooves away from the dry dock side, and the third reserved water-stop groove 23 and the fourth reserved water-stop groove 24 are water-stop grooves close to the dry dock side, the overall grouting sequence of the reserved water-stop grooves 2 is the first reserved water-stop groove 21 → the second reserved water-stop groove 22 → the third reserved water-stop groove 23 → the fourth reserved water-stop groove 24; correspondingly, the grouting sections in each reserved water-stop groove 2 are advanced sequentially according to a unified starting end: the grouting sequence of the grouting sections in the first reserved water-stop groove 21 is the first grouting section 3211 → the second grouting section 3212 → the third reserved water-stop groove 24. The grouting sequence of the grouting zones in the second reserved water-stop groove 22 is: fourth grouting zone 3221 → fifth grouting zone 3222 → sixth grouting zone 3223. The grouting sequence of the grouting zones in the third reserved water-stop groove 23 is: seventh grouting zone 3231 → eighth grouting zone 3232 → ninth grouting zone 3233 → tenth grouting zone 3234. The grouting sequence of the grouting zones in the fourth reserved water-stop groove 24 is: eleventh grouting zone 3241 → twelfth grouting zone 3242 → thirteenth grouting zone 3243 → fourteenth grouting zone 3244.

[0069] This unified, progressive grouting sequence design has significant technical advantages: Firstly, it follows the overall logic of "away from the dry dock side → closer to the dry dock side," completing the grouting of areas with relatively low waterproofing requirements first. This forms a temporary protective barrier, preventing external construction interference during subsequent grouting of critical areas (closer to the dry dock side, bottom of the box girder), while also reducing the risk of grout material leakage to the dry dock side. Secondly, the "same starting point, unidirectional advancement" partitioned grouting method within each reserved waterstop groove 2 ensures uniform diffusion of the grouting material along a fixed direction, avoiding pressure collisions and air bubble retention caused by reverse grouting in different partitions. It is particularly suitable for the high-precision filling requirements of the third reserved waterstop groove 23 and the fourth reserved waterstop groove 24 (multiple partitions), allowing each partition to achieve full and dense filling. In addition, the unified sequence design simplifies the construction operation process, making it easier for on-site personnel to accurately control the construction rhythm, improving construction efficiency and consistency of grouting quality, and further ensuring the reliability of the overall waterproofing system.

[0070] Within each reserved waterstop groove 2, each grouting zone adopts a precise grouting connection method that switches immediately upon reaching the pressure standard: when grouting is performed on the current grouting zone, the grouting pressure data is collected in real time through a pressure monitoring device. When the pressure reaches the preset pressure threshold, the grouting operation of that zone is stopped immediately without waiting for additional pressure stabilization time, and the grouting process of the next grouting zone is started. This cycle continues until all grouting zones within the reserved waterstop groove 2 have been grouted. The preset pressure threshold must be strictly controlled to be no less than the upper limit of the grouting working pressure, which serves as the core criterion for determining whether the grouting density of each zone meets the standard.

[0071] In this embodiment, the grouting working pressure is set to 2.0~2.5MPa, and the corresponding preset pressure threshold is set to 2.5~3.0MPa. This threshold is higher than the upper limit of the grouting working pressure to ensure that the grouting material can fully fill the gap of the reserved water stop groove 2 and squeeze out the internal air, while not exceeding the structural bearing capacity of the reserved water stop groove 2 and the force transmission plate 6, so as to avoid the deformation of the Q-type water stop 1, the damage of the reserved water stop groove 2, or the excessive overflow of grouting material due to excessive pressure, which would cause waste.

[0072] By using pressure compliance as a rigid indicator for terminating grouting in each zone, the grouting density of each zone can be objectively quantified, effectively avoiding under-grouting (insufficient pressure) or over-grouting (excessive pressure) caused by human error. This ensures that all zones (especially the third reserved water-stop groove 23 and the fourth reserved water-stop groove 24 near the dry dock side) can be uniformly and fully filled, fundamentally guaranteeing waterproofing reliability.

[0073] Within each reserved water-stop groove 2, the length of the grouting pipe 4 corresponding to each grouting zone is different. The length of the grouting pipe 4 is adapted to the distance between its corresponding grouting zone and the grouting end, so that the grouting material can be uniformly and densely filled into the corresponding grouting zone. The grouting end refers to the starting point where the grouting material enters the grouting pipe 4, that is, the output end where the grouting pipe 4 connects to the grouting equipment. The closer the grouting zone is to the grouting end, the shorter the length of the grouting pipe 4; the farther away from the grouting end, the longer the length of the grouting pipe 4, ensuring that the grouting pipe 4 can accurately connect to the corresponding grouting zone and avoid problems such as grouting delay and uneven filling caused by long-distance transportation.

[0074] Each grouting zone is equipped with a corresponding grouting pipe 4 for independent grouting, avoiding interference between grouting in different zones. In this embodiment, the grouting end settings of each reserved water-stop groove 2, the correspondence between grouting zones and grouting pipes 4, and the length adaptation design are as follows:

[0075] See appendix Figure 6 and Figure 7Within the first reserved water-stop groove 21, the grouting end is located on the side close to the third grouting section 3213. The first grouting section 3211 corresponds to the first grouting pipe 4211, the second grouting section 3212 corresponds to the second grouting pipe 4212, and the third grouting section 3213 corresponds to the third grouting pipe 4213. Because the third grouting section 3213 is closest to the grouting end, the third grouting pipe 4213 is the shortest and can be directly and quickly grouted. The first grouting section 3211 is farthest from the grouting end, and the first grouting pipe 4211 is the longest, ensuring that the grouting material can be accurately delivered to the far-end section. The length of the second grouting pipe 4212 is between the two, which is suitable for the grouting needs of the corresponding section.

[0076] See appendix Figure 8 Within the second reserved water-stop groove 22, the grouting end is set in the same way as the first reserved water-stop groove 21. The fourth grouting section 3221 corresponds to the fourth grouting pipe 4221, the fifth grouting section 3222 corresponds to the fifth grouting pipe 4222, and the sixth grouting section 3223 corresponds to the sixth grouting pipe 4223. The design follows the principle that the closer to the grouting end, the shorter the pipe length. The sixth grouting section 3223 is closest to the grouting end and the sixth grouting pipe 4223 is the shortest. The fourth grouting section 3221 is farthest from the grouting end and the fourth grouting pipe 4221 is the longest, ensuring that each section can achieve short-distance fast grouting and long-distance precise grouting.

[0077] See appendix Figure 9 Within the third reserved water-stop groove 23, the grouting end is set opposite to the first reserved water-stop groove 21 and the second reserved water-stop groove 22 (on the side closer to the seventh grouting section 3231). The seventh grouting section 3231 corresponds to the seventh grouting pipe 4231, the eighth grouting section 3232 corresponds to the eighth grouting pipe 4232, the ninth grouting section 3233 corresponds to the ninth grouting pipe 4233, and the tenth grouting section 3234 corresponds to the tenth grouting pipe 4234. Since the tenth grouting section 3234 is farthest from the reverse grouting end, the corresponding tenth grouting pipe 4234 has the longest length, and the lengths of the other grouting pipes decrease sequentially as the distance between the section and the grouting end decreases.

[0078] The reason for reversing the grouting end here is to adapt to the layout of the box-type steel beam structure 9 (the third reserved water-stop groove 23 is located at the bottom of the structure and belongs to the key waterproof area). The reverse setting can avoid the grouting pipes of the first reserved water-stop groove 21 and the second reserved water-stop groove 22 from crossing and getting tangled, reducing construction interference; at the same time, it can make the four grouting zones of the third reserved water-stop groove 23 form a more balanced grouting coverage, avoid the problem of untimely filling of the far zone (in the case of multiple zones) when grouting in one direction, and ensure the grouting quality of the key area.

[0079] See appendix Figure 10Within the fourth reserved water-stop groove 24, a double-end grouting design is adopted. The eleventh grouting section 3241 corresponds to the eleventh grouting pipe 4241, and the twelfth grouting section 3242 corresponds to the twelfth grouting pipe 4242. Grouting is handled by one end of the grouting end. The eleventh grouting section 3241 is closer to this grouting end, the eleventh grouting pipe 4241 is shorter, and the twelfth grouting pipe 4242 is longer. The thirteenth grouting section 3243 corresponds to the thirteenth grouting pipe 4243, and the fourteenth grouting section 3244 corresponds to the fourteenth grouting pipe 4244. Grouting is handled by the other end of the grouting end. The fourteenth grouting section 3244 is closer to this grouting end, the fourteenth grouting pipe 4244 is shorter, and the thirteenth grouting pipe 4243 is longer. The double-grouting end design of the fourth reserved water-stop groove 24 can solve the problems of near-end overflow and far-end under-grouting that are prone to occur in long-distance single-end grouting, and achieve uniform filling of the whole area without dead corners.

[0080] The gas injection test specifically includes:

[0081] S31. Close the sealing structure at the end of the grouting pipe 4 to form an independent closed channel inside the grouting pipe 4;

[0082] S32. Compressed air is introduced into the grouting pipe 4 through the air injection device, and the test pressure is set to be no less than 1.2 times the subsequent grouting working pressure;

[0083] S33. After pressurizing to the set test pressure, stop the gas supply and maintain the pressure for no less than 3 minutes, during which time the pressure changes are monitored in real time.

[0084] S34. If the pressure drop does not exceed the preset allowable range during the pressure holding period, the permeability of the grouting pipe 4 is deemed qualified. If the pressure drop exceeds the preset allowable range, the grouting pipe blockage, poor sealing, and other problems need to be investigated. After the problems are resolved, the air injection test is repeated until it is qualified.

[0085] In this embodiment, the end of the grouting pipe 4, i.e., the seamless steel pipe section 41 of the grouting pipe 4, is far from the end of the high-pressure rubber pipe section 42, and the sealing structure is a one-way sealing valve core. This one-way sealing valve core is made of highly elastic wear-resistant rubber material and has a conical structure. Its outer diameter is interference-fitted with the inner diameter of the end of the seamless steel pipe section 41. Under natural conditions, it relies on the elastic deformation of the rubber to tightly fit the inner wall of the pipe, so as to form a sealed channel.

[0086] In conjunction with the grouting working pressure of this embodiment (2.0~2.5MPa), the test pressure for the air injection test is specifically set to 2.5~3.0MPa (meeting the requirement of "not less than 1.2 times the grouting working pressure"); the preset allowable range is set to a pressure drop value ≤0.1MPa, which can accurately detect potential hazards such as minor blockages and pipeline damage in the grouting pipe 4, and avoid misjudgments caused by an overly strict allowable range (such as slight air pressure leakage that is not a problem with the pipeline itself).

[0087] See appendix Figure 4 and Figure 5 The grouting pipe 4 has a two-section structure, comprising a seamless steel pipe section 41 fixed to the force transmission plate 6 and located in the area of ​​the reserved water-stop groove 2, and a high-pressure rubber pipe section 42 extending out of the ground and used to connect to the grouting machine. The seamless steel pipe section 41 and the high-pressure rubber pipe section 42 are fixedly connected by a corrosion-resistant sealing joint (such as a stainless steel compression fitting), ensuring a reliable seal at the connection and eliminating the risk of air or grout leakage. After extending out of the ground, the high-pressure rubber pipe section 42 extends to the top of the diaphragm wall 7.

[0088] See appendix Figure 9 and Figure 10 The seamless steel pipe section 41 of the grouting pipe 4 can be set in multiple sections, so that it can be flexibly arranged according to the outline of the immersed tube structure, the construction space layout and the installation position of the diaphragm wall 7, adapting to the complex spatial orientation between the bottom of the pipe section and the ground, avoiding obstacles such as structural steel bars and embedded parts, and adjusting the laying angle and path according to the construction scene. Finally, it is connected to the ground through the high-pressure rubber pipe section 42 and extended to the grouting operation platform at the top of the diaphragm wall 7.

[0089] A check valve is installed at the end of the seamless steel pipe section 41 away from the high-pressure rubber hose section 42 of the grouting pipe 4. The flow direction of the check valve is consistent with the grouting direction. The check valve is used to prevent the grouting material, silt and external debris in the reserved water-stop groove 2 from flowing back into the grouting pipe 4. In this embodiment, the check valve is specifically installed at the end of the seamless steel pipe section 41 away from the high-pressure rubber hose section 42, about 5 to 10 cm away from the one-way sealing valve core.

[0090] The functional adaptation logic between air injection test and grouting is as follows: During the air injection test, the one-way sealing valve core is naturally sealed. Compressed air enters the seamless steel pipe section 41 through the high-pressure rubber tube section 42, passes through the flow direction of the check valve, and is sealed in the pipeline by the one-way sealing valve core. When the pressure is maintained for ≥3 minutes and the pressure drop is ≤0.1MPa, the permeability of the grouting pipe 4 is deemed qualified. During the grouting stage, the grouting material pushes the one-way sealing valve core under the working pressure, causing it to deform elastically and form a gap with the inner wall of the pipe. The grouting material flows out smoothly from this gap and is injected into the corresponding grouting zone. After the grouting stops, the grouting pressure disappears, the one-way sealing valve core automatically resets and seals, and the check valve simultaneously blocks the reverse backflow, providing double protection to avoid grouting pipe blockage.

[0091] In this embodiment, the two-section structure of the grouting pipe 4 adopts differentiated parameter design to precisely adapt to the needs of different construction scenarios: the seamless steel pipe section 41 is a high-strength seamless steel pipe with a diameter of 30mm and a wall thickness of 2mm to fit the narrow installation space in the reserved water-stop groove 2, and the 2mm wall thickness ensures that the pipeline has sufficient rigidity and impact resistance to withstand the external pressure during construction processes such as dry dock filling and pipe section connection, avoiding pipeline deformation and damage. The high-pressure rubber pipe section 42 is a high-pressure wear-resistant rubber pipe with a diameter of 50mm. Compared with the seamless steel pipe section, the pipe diameter is larger, which can effectively reduce the resistance during the transportation of grouting materials (especially grouting materials containing aggregates), reduce the risk of material retention and pipeline blockage, and at the same time, combined with its flexible characteristics, it can still ensure smooth material transportation after bending. In addition, considering the grouting working pressure of 2.0~2.5MPa in this embodiment, the high-pressure rubber pipe section 42 is selected to be a high-pressure wear-resistant rubber pipe with a rated pressure of not less than 3.75MPa (i.e. not less than 1.5 times the grouting working pressure). This not only meets the pressure requirements of normal grouting operations, but also meets the high-pressure test of the air injection test (test pressure 2.5~3.0MPa), avoiding the rubber pipe from bursting or leaking due to excessive pressure.

[0092] In the above illustrative embodiments, the grouting method for the reserved water-stop groove of the submerged tube bottom plate force transmission plate first forms the reserved water-stop groove by arranging Q-type water-stop strips, and then designs grouting zones according to needs. More grouting zones are divided for the reserved water-stop groove located at the bottom of the structure near the dry dock. Combined with the precise matching of the grouting pipe length and the distance between the grouting zones, uniform and dense filling of grouting is achieved, which significantly improves waterproofing reliability and enhances long-term waterproofing durability. At the same time, the grouting sequence of the reserved water-stop groove and grouting zones is standardized. Combined with the pressure connection logic of switching to the next zone when the pressure of the current grouting zone reaches the preset threshold, it avoids cross-interference of grouting, improves construction flow efficiency, and ensures that each zone is fully grouted without gaps. It takes into account both construction efficiency and waterproofing quality and is suitable for high-precision waterproofing construction scenarios at the force transmission plate of the submerged tube bottom plate.

[0093] The above embodiments are only used to illustrate the technical solutions of the present invention and not to limit them; although the present invention has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications can still be made to the specific implementation of the present invention or equivalent substitutions can be made to some technical features without departing from the spirit of the technical solutions of the present invention, and all such modifications and substitutions should be covered within the scope of the technical solutions claimed in the present invention.

Claims

1. A method for grouting a reserved water stop groove of a immersed tube bottom plate force transfer plate, characterized in that, Includes the following steps: S1. Before filling the dry dock (8) with water, multiple Q-type waterstops (1) are fixedly installed on the force transmission plate (6) at the bottom plate position of the final joint end pipe section (5) along the transverse direction of the pipe section. The multiple Q-type waterstops (1) are arranged in parallel along the axial direction of the pipe section, and a reserved waterstop groove (2) is formed between adjacent Q-type waterstops (1). S2. Divide each of the reserved water-stop grooves (2) into at least one grouting zone along the pipe section. Set a grouting pipe (4) in each grouting zone. The embedded section of the grouting pipe (4) is fixed on the force transmission plate (6) and the embedded section of the grouting pipe (4) is parallel to the Q-type water-stop strip (1). S3. After the final joint end pipe section (5) is installed, an air injection test is carried out on all grouting pipes (4) to test the permeability of the grouting pipes (4); S4. Grouting is carried out in sequence according to the preset grouting sequence of the reserved water stop groove (2). In each reserved water stop groove (2), grouting is carried out in sequence according to the preset grouting zone grouting sequence.

2. The grouting method for the pre-reserved water-stop groove in the force transmission plate of the submerged pipe bottom plate according to claim 1, characterized in that, The reserved water-stop groove (2) includes a water-stop groove on the side away from the dry dock (8) and a water-stop groove on the side close to the dry dock (8). The water-stop groove on the side close to the dry dock (8) is located at the bottom of the box-type steel beam structure (9) installed on the final joint end pipe section (5). The number of grouting sections of the water-stop groove on the side close to the dry dock (8) is greater than the number of grouting sections of the water-stop groove on the side away from the dry dock (8).

3. The grouting method for the pre-reserved water-stop groove in the force transmission plate of the submerged pipe bottom plate according to claim 1, characterized in that, The grouting sequence of the pre-set reserved water stop groove (2) is to grout sequentially from the side away from the dry dock (8) to the side close to the dry dock (8); within each reserved water stop groove (2), the grouting sequence of the pre-set grouting zone is to grout sequentially from the same end of each reserved water stop groove (2) to the other end.

4. The grouting method for the pre-reserved water-stop groove in the force transmission plate of the submerged pipe bottom plate according to claim 1, characterized in that, Within each reserved water-stop groove (2), the grouting connection method of each grouting section is as follows: when the grouting pressure of the current grouting section reaches the preset pressure threshold, the grouting of the grouting section is stopped, and the grouting operation of the next grouting section is started, until all grouting sections in the reserved water-stop groove (2) are grouted. The preset pressure threshold is not lower than the upper limit of the grouting working pressure.

5. The grouting method for the pre-reserved water-stop groove in the force transmission plate of the submerged pipe bottom plate according to claim 1, characterized in that, Within each reserved water-stop groove (2), the length of the grouting pipe (4) corresponding to each grouting zone is different. The length of the grouting pipe (4) is adapted to the distance between its corresponding grouting zone and the grouting end, so that the grouting material can be uniformly and densely filled into the corresponding grouting zone.

6. The grouting method for the pre-reserved water-stop groove in the force transmission plate of the submerged pipe bottom plate according to claim 1, characterized in that, The gas injection test specifically includes: S31. Close the sealing structure at the end of the grouting pipe (4) to form an independent closed channel inside the grouting pipe (4); S32. Compressed air is introduced into the grouting pipe (4) through the air injection device, and the test pressure is set to be no less than 1.2 times the subsequent grouting working pressure; S33. After pressurizing to the set test pressure, stop the gas supply and maintain the pressure for no less than 3 minutes, during which time the pressure changes are monitored in real time. S34. If the pressure drop does not exceed the preset allowable range during the pressure holding period, the permeability of the grouting pipe (4) is deemed qualified.

7. The grouting method for the pre-reserved water-stop groove in the force transmission plate of the submerged pipe bottom plate according to claim 1, characterized in that, The grouting pipe (4) has a two-section structure. The grouting pipe (4) includes a seamless steel pipe section (41) fixed to the force transmission plate (6) and located in the area of ​​the reserved water stop groove (2), and a high-pressure rubber pipe section (42) that extends out of the ground and is used to connect the grouting machine. The seamless steel pipe section (41) and the high-pressure rubber pipe section (42) are fixedly connected by a sealing joint.

8. The grouting method for the pre-reserved water-stop groove in the force transmission plate of the submerged pipe bottom plate according to claim 7, characterized in that, The seamless steel pipe section (41) of the grouting pipe (4) is provided with a check valve at the end away from the high-pressure rubber pipe section (42). The flow direction of the check valve is consistent with the grouting direction. The check valve is used to block the grouting material, silt and external debris in the reserved water stop groove (2) from flowing back into the grouting pipe (4).

9. The grouting method for the pre-reserved water-stop groove in the force transmission plate of the submerged pipe bottom plate according to claim 8, characterized in that, The seamless steel pipe section (41) has a diameter of 30 mm and a wall thickness of 2 mm, the high-pressure rubber pipe section (42) has a diameter of 50 mm, and the rated pressure resistance of the high-pressure rubber pipe section (42) is not less than 1.5 times the grouting working pressure.

10. The grouting method for the pre-reserved water-stop groove in the force transmission plate of the submerged pipe bottom plate according to claim 8, characterized in that, The high-pressure rubber hose section (42) extends from the ground to the top of the diaphragm wall (7).

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