Permanent and temporary combined ring frame beam and side wall multi-stage grouting composite waterproof structure of shield well

Abstract

The utility model relates to the technical field of underground engineering waterproofing, and discloses a shield well permanent and temporary combination ring frame beam and side wall multi-stage grouting composite waterproof structure which comprises an underground diaphragm wall body, a permanent and temporary combination ring frame beam body and a side wall body. According to the shield well permanent and temporary combined ring frame beam and side wall multi-stage grouting composite waterproof structure, the PVC waterproof coiled material adopts the specification with the thickness larger than or equal to 1.5 mm, a three-stage continuous sealing layer is formed by the PVC waterproof coiled material, the polysulfide sealant and the water stop belt through the sweat soldering technology, the underground water permeation path is effectively blocked, the joint leakage rate is remarkably reduced, the galvanized grouting steel pipe is pre-buried in the DN specification, and therefore the construction efficiency is improved. The galvanized grouting steel pipe works cooperatively with the repeatable grouting pipe, through the multi-round grouting technology of single-liquid cement paste, full compaction of a cement paste filling layer is achieved, the leakage risk of structural joints and cavities is thoroughly eliminated, and the galvanized grouting steel pipe creatively has the dual functions of underground water guide and drainage in the construction period and permanent anti-seepage grouting. Precise regulation and control of the grouting process are achieved through a ball valve control system.

Description

TECHNICAL FIELD

[0001] The application relates to the technical field of underground engineering waterproofing, in particular to a shield well permanent-temporary combined ring beam and side wall multistage grouting composite waterproof structure. BACKGROUND

[0002] In traditional shield well construction, the waterproofing technology of the connecting joint of the ring beam and the side wall has significant defects: first, the ring beam waterproofing system is not closed, resulting in the risk of water seepage between the ring beam and the diaphragm wall; second, the lap joint technology of the waterproofing material is not rigorous, and is prone to form virtual welding or cavities, resulting in high risk of underground water seepage; third, the waterproofing layer of the permanent-temporary combined structure is easily damaged by subsequent processes due to the difference between construction stages.

[0003] Although the prior art adopts the pre-embedded grouting pipe and hot melt welding technology, a multistage collaborative anti-seepage system is still lacking, grouting filling is not sufficient, and high-precision waterproofing cannot be achieved in complex stratum environments, which cannot meet the stringent requirements of urban underground engineering on long-term anti-seepage. In order to solve the above problems, the shield well permanent-temporary combined ring beam and side wall multistage grouting composite waterproof structure is provided. CONTENT OF THE UTILITY MODEL

[0004] In view of the deficiencies of the prior art, the shield well permanent-temporary combined ring beam and side wall multistage grouting composite waterproof structure is provided, which realizes joint sealing and dynamic waterproofing through the synergistic effect of the pre-embedded waterproofing material, the multistage grouting system and the micro-expanding concrete, and solves the problem of construction joint leakage in the traditional technology.

[0005] To achieve the above purpose, the application provides the following technical scheme: the shield well permanent-temporary combined ring beam and side wall multistage grouting composite waterproof structure comprises a diaphragm wall body, a permanent-temporary combined ring beam body and a side wall body, a cement-based permeable crystalline coating is arranged in the superimposed area of the diaphragm wall body and the permanent-temporary combined ring beam body, and a PVC waterproofing material with a thickness of 1.5 mm is pre-embedded, a polysulfide sealant is applied to the top of the PVC waterproofing material and the connecting surface of the diaphragm wall body, and a waterstop is additionally attached and pasted, and the waterstop and the PVC waterproofing material are folded together into an L shape.

[0006] A repeatable grouting pipe is arranged on the bottom surface of the permanent-temporary combined ring beam body along the center line, a grouting head is arranged at intervals of 5-6 m, a galvanized grouting steel pipe is pre-embedded on the top surface of the side wall body, one end of the galvanized grouting steel pipe abuts against the PVC waterproofing material, and the other end is exposed on the surface of the side wall body, two rows of pouring holes are pre-set on the top of the permanent-temporary combined ring beam body, the pouring holes are used for layered pouring of pumped concrete and micro-expanding concrete, thereby forming a cement slurry filling layer, the galvanized grouting steel pipe can be used for underground water diversion and drainage and multi-round grouting replacement, and the joint between the permanent-temporary combined ring beam body and the side wall body is dynamically grouted by cooperating with the repeatable grouting pipe.

[0007] Through the above scheme, the PVC waterproof coiled material adopts a specification with a thickness of 1.5 mm or more, forms a three-level continuous sealing layer with the polysulfide sealant and the waterstop through a hot melt welding process, effectively blocks the groundwater penetration path, and significantly reduces the joint leakage rate, the galvanized grouting steel pipe is pre-embedded with a DN specification and works in cooperation with the repeatable grouting pipe, and through a multi-round grouting process of single liquid cement slurry, the cement slurry filling layer is fully compacted, and the structural joint and cavity leakage risk is completely eliminated, the galvanized grouting steel pipe innovatively has dual functions of underground water drainage during construction and permanent anti-seepage grouting, and precise regulation and control of the grouting process are realized through a ball valve control system, and through the synergistic effect of the key components such as the PVC waterproof coiled material, the waterstop, the polysulfide sealant, the repeatable grouting pipe, the galvanized grouting steel pipe, and the cement slurry filling layer, a complete dynamic waterproof system is formed, the waterproof reliability and construction efficiency are improved, and the leakage problem of the traditional process is effectively solved.

[0008] Further, a plurality of diaphragm wall embedded bars are pre-embedded in the diaphragm wall body, and the diaphragm wall body and the permanent-temporary combined ring beam body are connected through the diaphragm wall embedded bars.

[0009] Through the above scheme, the overall integrity and load transmission capacity of the structure can be significantly enhanced, the structural stability of the permanent-temporary combined part is ensured, and the damage of the waterproof layer caused by deformation difference is effectively prevented.

[0010] Further, the PVC waterproof coiled material has a transverse lap width of 100 mm and a lap length of 500 mm, and is fixed through hot melt welding.

[0011] Through the above scheme, the PVC waterproof coiled material adopts a design of a transverse lap width of 100 mm and a lap length of 500 mm, and is firmly connected through a professional hot melt welding process, so as to ensure that a continuous and complete waterproof barrier is formed at the joint, and the occurrence of groundwater penetration and joint leakage problems is effectively prevented, which not only ensures the convenience of construction, but also greatly improves the reliability of the waterproof system.

[0012] Further, the hot melt welding temperature of the PVC waterproof coiled material is 230-260 DEG C, the welding speed is 0.3-0.5 m / min, and the brushing width of the polysulfide sealant is 20 mm and the thickness is 30 mm.

[0013] Through the above scheme, the PVC waterproof coiled material adopts hot melt welding at 230-260 DEG C and a welding speed of 0.3-0.5 m / min to ensure that the joint is firmly fused without virtual welding, and the 20 mm x 30 mm brushing size of the polysulfide sealant forms an effective sealing band, which realizes the waterproof effect of no dripping at the joint.

[0014] Furthermore, the waterstop has dimensions of 400mm × 10mm, and extends 200mm on each side after folding. The thickness of the cement-based penetrating crystalline coating is not less than 1mm, and the dosage is not less than 1.5kg / m².

[0015] The above solution uses a 400mm×10mm waterstop, which is folded to form an L-shaped double 200mm extension to ensure all-round sealing of the joint. The cement-based penetrating crystalline coating has a thickness of ≥1mm and a dosage of ≥1.5kg / m², forming a dense waterproof barrier that effectively prevents water penetration. The synergistic effect of the two significantly improves the structural waterproof reliability.

[0016] Furthermore, the reusable grouting pipe has an outer diameter of 18mm and a wall thickness of 5mm. It is fixed to the bottom surface of the permanent and temporary combined ring beam body by fixing clips and nails. The fixing clips are spaced 200-300mm apart. The grout outlet end of the galvanized grouting steel pipe is sealed with plastic tape, and the grout inlet end is equipped with a threaded ball valve.

[0017] The above scheme uses a reusable grouting pipe with an outer diameter of 18mm and a wall thickness of 5mm. The installation is ensured by fixing clamps with a spacing of 200-300mm. The galvanized grouting steel pipe uses plastic tape to seal the grout outlet and threaded ball valve to connect the grout inlet, so as to achieve reliable sealing and controllable grouting, and ensure the durability and operability of the grouting system.

[0018] Furthermore, the side wall body is provided with a disc-locking operating frame on its exterior. The diameter of the pouring holes is 150mm and the spacing is 1000mm. The pumped concrete is assisted by the disc-locking operating frame for pouring. The micro-expansion concrete is poured when the pouring surface is 600mm away from the bottom surface of the permanent and temporary combined ring frame beam body.

[0019] The above scheme provides construction support by setting up a disc-locking operating frame on the outside of the side wall body. Limiting the diameter and spacing of the pouring holes can ensure uniform concrete pouring. Pumping concrete can be improved by using the disc-locking operating frame to assist in pouring. The micro-expansion concrete can be poured at a distance of 600mm from the bottom surface of the permanent and temporary combined ring beam body to effectively compensate for shrinkage and ensure that the structure is dense and leak-free.

[0020] Furthermore, after the galvanized grouting steel pipe is connected to the ball valve, a single-liquid grout is injected through a ground grouting pump, and observation holes are set at 5m intervals at the grouting port.

[0021] With the above scheme, after the galvanized grouting steel pipe is connected to the ball valve, pressure grouting is achieved by injecting single-liquid grout through the ground grouting pump. Observation holes are set at 5m intervals to monitor the grouting effect in real time, ensuring that the grout fully fills the gaps and controlling the grouting quality.

[0022] Furthermore, the overlap between the waterstop and the PVC waterproof membrane is hot-melt welded using a hot air gun, and the density of the cement slurry filling layer is achieved through multiple dynamic groutings via a repeatable grouting pipe.

[0023] The above solution ensures a tight seal at the joints, preventing groundwater seepage. The cement grout filling layer is fully compacted through repeated dynamic grouting via repeatable grouting pipes, eliminating structural voids and forming a complete anti-seepage system.

[0024] Compared with the prior art, the technical solution of this application has the following beneficial effects:

[0025] This shield tunnel shaft features a combined permanent and temporary ring beam and sidewall multi-stage grouting composite waterproofing structure. The PVC waterproof membrane, with a thickness ≥1.5mm, is welded together with polysulfide sealant and waterstops to form a three-stage continuous sealing layer, effectively blocking groundwater seepage and significantly reducing joint leakage. The galvanized grouting steel pipes, pre-embedded in DN specifications, work in conjunction with reusable grouting pipes. Through a multi-stage grouting process using single-liquid cement grout, the cement grout filling layer is fully compacted, completely eliminating the risk of leakage from structural joints and cavities. The galvanized grouting steel pipes innovatively combine groundwater drainage during construction and permanent seepage prevention grouting. A ball valve control system enables precise control of the grouting process. This structure, through the synergistic effect of key components such as PVC waterproof membrane, waterstops, polysulfide sealant, reusable grouting pipes, galvanized grouting steel pipes, and cement grout filling layers, forms a complete dynamic waterproofing system, improving waterproofing reliability and construction efficiency, and effectively solving the leakage problems of traditional processes. Attached Figure Description

[0026] Figure 1 This is a cross-sectional view of the waterproof structure of the ring beam and diaphragm wall.

[0027] Figure 2 This is a cross-sectional view of the waterproofing structure of the ring beam and side walls.

[0028] Figure 3 Layout plan of the repeatable grouting system;

[0029] Figure 4 Cross-sectional view of grouting filling at the connection node between the ring beam and the side wall.

[0030] In the picture:

[0031] 1. Diaphragm wall body; 2. Permanent and temporary combined ring beam body; 3. Diaphragm wall embedded reinforcing bars; 4. PVC waterproof membrane; 5. Waterstop strip; 6. Polysulfide sealant; 7. Cement-based penetrating crystallizing coating; 8. Repeatable grouting pipe; 9. Galvanized grouting steel pipe; 10. Pouring hole; 11. Disc-lock operating frame; 12. Side wall body; 13. Pumped concrete; 14. Micro-expansion concrete; 15. Cement slurry filling layer. Detailed Implementation

[0032] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0033] Please see Figure 1 , Figure 2 and Figure 3 The multi-stage grouting composite waterproofing structure of the permanent and temporary combined ring beam and sidewalls in this embodiment includes a diaphragm wall body 1, a permanent and temporary combined ring beam body 2, and a sidewall body 12. Multiple diaphragm wall pre-embedded reinforcing bars 3 are pre-embedded inside the diaphragm wall body 1. The diaphragm wall body 1 and the permanent and temporary combined ring beam body 2 are connected by the diaphragm wall pre-embedded reinforcing bars 3, which can significantly enhance the integrity and load transfer capacity of the structure, ensure the structural stability of the permanent and temporary joint, and effectively prevent damage to the waterproofing layer due to deformation differences. A cement-based penetrating crystalline coating 7 is provided in the overlapping area of ​​the diaphragm wall body 1 and the permanent and temporary combined ring beam body 2, and a 1.5mm thick PVC waterproof membrane is pre-embedded. Material 4, PVC waterproof membrane 4, has a horizontal overlap width of 100mm and an overlap length of 500mm. It is fixed by hot-melt welding. The PVC waterproof membrane 4 adopts a design with a horizontal overlap width of 100mm and an overlap length of 500mm. It achieves a firm connection through professional hot-melt welding process, ensuring that a continuous and complete waterproof barrier is formed at the joint, effectively preventing groundwater seepage and joint leakage. This design not only ensures the convenience of construction, but also greatly improves the reliability of the waterproof system. The top of the PVC waterproof membrane 4 is coated with polysulfide sealant 6 at the connection surface with the diaphragm wall body 1, and a waterstop 5 is attached. The waterstop 5 and the PVC waterproof membrane 4 are folded together into an L-shape.

[0034] Please see Figure 1 , Figure 2 and Figure 3The hot-melt welding temperature of PVC waterproof membrane 4 is 230-260℃, and the welding speed is 0.3-0.5m / min. The application width of polysulfide sealant 6 is 20mm, and the thickness is 30mm. The PVC waterproof membrane 4 is hot-melt welded at 230-260℃, and the welding speed of 0.3-0.5m / min ensures that the joint is firmly fused without any incomplete welds. The 20mm×30mm application size of polysulfide sealant forms an effective sealing strip, providing double protection to achieve a leak-proof waterproof effect at the joint. The size of the waterstop 5 is 400mm×10mm, and after folding, it extends 20mm on each side. The thickness of the cement-based penetrating crystalline coating 7 is not less than 1mm, and the dosage is not less than 1.5kg / m². The waterstop 5 adopts a specification of 400mm×10mm, which is folded to form an L-shaped double 200mm extension to ensure all-round sealing of the joint. The thickness of the cement-based penetrating crystalline coating 7 is ≥1mm and the dosage is ≥1.5kg / m², forming a dense waterproof barrier to effectively prevent water penetration. The synergistic effect of the two significantly improves the waterproof reliability of the structure. The overlapping part of the waterstop 5 and the PVC waterproof membrane 4 is hot-melt welded with a hot air gun to ensure that the joint is tightly sealed and prevents groundwater penetration.

[0035] Please see Figure 2 , Figure 3 and Figure 4 A repeatable grouting pipe 8 is arranged along the centerline on the bottom surface of the permanent and temporary combined ring beam body 2, with grouting heads installed at intervals of 5-6m. A galvanized grouting steel pipe 9 is pre-embedded on the top surface of the side wall body 12. One end of the galvanized grouting steel pipe 9 abuts against the PVC waterproof membrane 4, and the other end is exposed on the surface of the side wall body 12. The outer diameter of the repeatable grouting pipe 8 is 18mm, and the wall thickness is 5mm. It is fixed to the bottom surface of the permanent and temporary combined ring beam body 2 by fixing clips and nails. The fixing clips are spaced 200-300mm apart. The grout outlet end of the galvanized grouting steel pipe 9 is sealed with plastic tape, and the grout inlet end is equipped with a threaded ball valve. After the galvanized grouting steel pipe 9 is connected to the ball valve... Single-component grout is injected through a ground grouting pump, and observation holes are set at 5m intervals at the grouting port. After the galvanized grouting steel pipe 9 is connected to the ball valve, pressure grouting is achieved by injecting single-component grout through the ground grouting pump. Observation holes are set at 5m intervals to monitor the grouting effect in real time, ensuring that the grout fully fills the gaps and controlling the grouting quality. The repeatable grouting pipe 8 is designed with an 18mm outer diameter and 5mm wall thickness. The installation is ensured to be stable by fixing clamps with a spacing of 200-300mm. The galvanized grouting steel pipe 9 uses plastic tape to seal the grout outlet and threaded ball valve to connect the grout inlet, achieving reliable sealing and controllable grouting, ensuring the durability and operability of the grouting system.

[0036] Please see Figure 2 , Figure 3 and Figure 4Two rows of pouring holes 10 are pre-set on the top of the permanent and temporary combined ring beam body 2. Concrete 13 and micro-expansion concrete 14 are poured in layers to form a cement slurry filling layer 15. A disc-locked operating frame 11 is installed on the outside of the side wall body 12. The diameter of the pouring holes 10 is 150mm, and the spacing is 1000mm. The pumped concrete 13 is assisted by the disc-locked operating frame 11. The micro-expansion concrete 14 is poured when the pouring surface is 600mm from the bottom surface of the permanent and temporary combined ring beam body 2. The disc-locked operating frame 11 on the outside of the side wall body 12 provides construction support, and the diameter and spacing of the pouring holes 10 are limited to ensure... To ensure uniform concrete pouring, the pumped concrete 13 is poured with the assistance of the disc-locking operating frame 11, which improves efficiency. The micro-expansion concrete 14 is poured at a distance of 600mm from the bottom surface of the permanent and temporary combined ring beam body 2, which can effectively compensate for shrinkage and ensure that the structure is dense and leak-free. The galvanized grouting steel pipe 9 can be used for groundwater drainage and multiple rounds of grouting replacement. In conjunction with the repeatable grouting pipe 8, dynamic grouting is performed on the joint between the permanent and temporary combined ring beam body 2 and the side wall body 12. The density of the cement slurry filling layer 15 is achieved through multiple dynamic groutings by the repeatable grouting pipe 8 and the galvanized grouting steel pipe 9, eliminating structural voids and forming a complete anti-seepage system.

[0037] In this embodiment, the shield tunnel shaft features a permanent and temporary combined ring frame beam and sidewall multi-stage grouting composite waterproof structure. The PVC waterproof membrane 4, with a thickness ≥1.5mm, is welded together with polysulfide sealant 6 and waterstop 5 to form a three-stage continuous sealing layer, effectively blocking groundwater seepage paths and significantly reducing joint leakage. The galvanized grouting steel pipe 9, pre-embedded with a DN20 specification, works in conjunction with the reusable grouting pipe 8. Through a multi-round grouting process using single-liquid cement grout, the cement grout filling layer 15 is fully compacted and thoroughly sealed. To eliminate the risk of leakage from structural joints and cavities, the galvanized grouting steel pipe 9 innovatively combines the dual functions of groundwater drainage during construction and permanent seepage prevention grouting. The ball valve control system enables precise control of the grouting process. Through the synergistic effect of key components such as PVC waterproof membrane 4, waterstop 5, polysulfide sealant 6, reusable grouting pipe 8, galvanized grouting steel pipe 9, and cement slurry filling layer 15, a complete dynamic waterproofing system is formed, which improves waterproofing reliability and construction efficiency, and effectively solves the leakage problem of traditional processes.

[0038] It should be noted that the waterproofing structure of the connection node between the diaphragm wall and the ring beam consists of diaphragm wall body 1 pre-embedded reinforcing bars 3 that connect to the permanent and temporary combined ring beam body 2, connected by sleeves. A cement-based penetrating crystalline coating 7 with a thickness ≥1mm and a dosage ≥1.5kg / m² is applied to the overlapping area of ​​the permanent and temporary combined ring beam body 2 and the diaphragm wall body 1. The bottom surface of the diaphragm wall pre-embedded reinforcing bars 3 is bent into an L-shape. A PVC waterproof membrane 4 with a thickness of 1.5mm and an overlap length of 500mm is pre-embedded to connect to the side wall body 12. The top of the PVC waterproof membrane 4 and the connection surface between it and the diaphragm wall body 1 are coated with polysulfide sealant 6, and a waterstop 5 is attached and folded into an L-shape. Before binding the reinforcing bars of the permanent and temporary combined ring beam body 2, a plastic film protective layer is laid on the bottom slab surface.

[0039] It should be noted that the construction process for the connection node between the ring beam and the side wall is as follows: clean the base surface of the diaphragm wall body 1 and the mud and sand around the pre-embedded PVC waterproof membrane 4 and waterstop 5; overlap the PVC waterproof membrane 4 of the side wall body 12 with the pre-embedded PVC waterproof membrane 4 of the permanent and temporary combined ring beam body 2 by 100mm on both the top and bottom; use a hot air gun for hot fusion welding; arrange repeatable grouting pipes 8 along the centerline on the bottom surface of the permanent and temporary combined ring beam body 2, with grouting heads set at intervals of 5-6m; and fix the clamps at intervals of 200-300mm. The top surface of the side wall body 12 is vertically... Galvanized grouting steel pipes 9 are pre-embedded in the direction of the straight PVC waterproof membrane 4. One end is against the PVC waterproof membrane 4, and the other end is exposed 200mm. They are arranged at intervals of 5-6m. Two rows of pouring holes 10 are set on the top of the permanent and temporary combined ring frame beam body 2. Pumped concrete 13 is poured in a cycle. When the pouring height of the surrounding holes rises to 0.8m, it jumps to the next pouring hole. When the overall pouring surface is 600mm away from the bottom surface of the permanent and temporary combined ring frame beam body 2, micro-expansion concrete 14 is poured to the top surface of the reserved hole of the permanent and temporary combined ring frame beam body 2.

[0040] It should be noted that the multi-stage grouting system is implemented by connecting the grout outlet of the galvanized grouting steel pipe 9 to the surface of the PVC waterproof membrane 4 through drilling, and connecting the grout inlet to a ball valve to drain groundwater. P·O42.5 single-component grout is injected at 10m intervals, with a water-cement ratio of 0.6:1 and a pressure of 0.8 to 1MPa. The first round of grouting is checked 10 to 14 days later. Grouting is repeated until there is no water seepage. Finally, the joint between the permanent and temporary combined ring beam body 2 and the side wall body 12 is supplemented with grout through the repeatable grouting pipe 8 to form a cement grout filling layer 15.

[0041] The working principle of the above embodiment is as follows: First, at the connection node between the diaphragm wall body 1 and the permanent-temporary combined ring beam body 2, pre-embedded reinforcing bars 3 are embedded in the diaphragm wall and connected by sleeves to enhance the overall structure. Cement-based penetrating crystalline coating 7 is applied to the superimposed area to form a basic waterproof barrier. Subsequently, a 1.5mm thick PVC waterproof membrane 4 is pre-embedded, and polysulfide sealant 6 is applied to the top. A waterstop 5 is folded into an L-shape to form a continuous sealing layer to block the groundwater seepage path. At the connection node between the permanent-temporary combined ring beam body 2 and the side wall body 12, repeatable grouting pipes 8 are arranged along the centerline of the bottom surface, with grouting heads set at intervals of 5-6m. A galvanized grouting steel pipe 9 is vertically embedded on the top surface of the side wall body 12, with one end supporting the PVC waterproof membrane 4 and the other end exposed 200mm. A grouting pump is connected through a ball valve. During construction, groundwater is drained using the galvanized grouting steel pipe 9, and P is injected at intervals of 10m. • O42.5 single-component grout, water-cement ratio 0.6:1, pressure 0.8~1MPa. After the first round of grouting, a re-inspection and supplementary grouting are carried out 10~14 days later until there is no leakage. At the same time, dynamic grouting is performed on the joint between the permanent and temporary combined ring frame beam body 2 and the side wall body 12 through the repeatable grouting pipe 8 to form a cement grout filling layer 15. In addition, the top of the permanent and temporary combined ring frame beam body 2 is pre-set with a pouring hole 10, and pumped concrete 13 is used for cyclic pouring. When the remaining 600mm is used, micro-expansion concrete 14 is used to compensate for shrinkage. Combined with the disc buckle operation frame 11, the construction efficiency is improved. The whole system eliminates the risk of cavity leakage through the three-level synergy of PVC waterproof membrane 4, waterstop 5, polysulfide sealant 6 sealing layer, repeatable grouting pipe 8, galvanized grouting steel pipe 9 dynamic grouting and micro-expansion concrete 14, achieving a high-precision waterproof effect with reduced joint leakage rate and increased grout filling rate.

[0042] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0043] Although embodiments of this application have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations can be made to these embodiments without departing from the principles and spirit of this application, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A composite waterproof structure for a shield tunnel shaft with a permanent and temporary combined ring frame beam and sidewalls, comprising a diaphragm wall body (1), a permanent and temporary combined ring frame beam body (2), and a sidewall body (12), characterized in that: The overlapping area of ​​the diaphragm wall body (1) and the permanent and temporary combined ring frame beam body (2) is provided with a cement-based penetrating crystallization coating (7) and a PVC waterproof membrane (4) with a thickness of 1.5mm is pre-embedded. The top of the PVC waterproof membrane (4) and the connecting surface of the diaphragm wall body (1) are coated with polysulfide sealant (6) and a waterstop (5) is attached. The waterstop (5) and the PVC waterproof membrane (4) are folded together into an L-shape. The bottom surface of the permanent and temporary combined ring frame beam body (2) is arranged with repeatable grouting pipes (8) along the centerline, and grouting heads are set at intervals of 5-6m. The top surface of the side wall body (12) is pre-embedded with galvanized grouting steel pipes (9). One end of the galvanized grouting steel pipe (9) is in contact with PVC waterproof membrane (4), and the other end is exposed on the surface of the side wall body (12). The top of the permanent and temporary combined ring frame beam body (2) has two rows of pre-set pouring holes (10). Cement slurry filling layer (15) is formed by layer-by-layer pouring of pumped concrete (13) and micro-expansion concrete (14). The galvanized grouting steel pipe (9) can be used for groundwater drainage and multiple rounds of grouting replacement. In conjunction with the repeatable grouting pipes (8), dynamic grouting is performed on the joint between the permanent and temporary combined ring frame beam body (2) and the side wall body (12).

2. The composite waterproof structure of the permanent and temporary combined ring frame beam and sidewall grouting of the shield tunnel shaft according to claim 1, characterized in that: The diaphragm wall body (1) has multiple diaphragm wall pre-embedded reinforcing bars (3) embedded inside, and the diaphragm wall body (1) and the permanent and temporary combined ring frame beam body (2) are connected by the diaphragm wall pre-embedded reinforcing bars (3).

3. The composite waterproof structure of the permanent and temporary combined ring frame beam and sidewall grouting of the shield tunnel shaft according to claim 1, characterized in that: The PVC waterproof membrane (4) has a transverse overlap width of 100mm and an overlap length of 500mm, and is fixed by hot melt welding.

4. The composite waterproof structure of the permanent and temporary combined ring frame beam and sidewall grouting of the shield tunnel shaft according to claim 1, characterized in that: The hot melt welding temperature of the PVC waterproof membrane (4) is 230-260℃, the welding speed is 0.3-0.5m / min, and the coating width of the polysulfide sealant (6) is 20mm and the thickness is 30mm.

5. The composite waterproof structure of the permanent and temporary combined ring frame beam and sidewall grouting of the shield tunnel shaft according to claim 1, characterized in that: The dimensions of the waterstop (5) are 400mm×10mm, and after folding, each side extends by 200mm. The thickness of the cement-based penetrating crystalline coating (7) is not less than 1mm, and the dosage is not less than 1.5kg / m².

6. The composite waterproof structure of the permanent and temporary combined ring frame beam and sidewall grouting of the shield tunnel shaft according to claim 1, characterized in that: The reusable grouting pipe (8) has an outer diameter of 18mm and a wall thickness of 5mm. It is fixed to the bottom surface of the permanent and temporary combined ring beam body (2) by fixing clips and nails. The fixing clips are spaced 200-300mm apart. The grout outlet end of the galvanized grouting steel pipe (9) is sealed with plastic tape, and the grout inlet end is equipped with a threaded ball valve.

7. The composite waterproof structure of the permanent and temporary combined ring frame beam and sidewall grouting of the shield tunnel shaft according to claim 1, characterized in that: The side wall body (12) is provided with a disc buckle operating frame (11) on the outside. The diameter of the pouring hole (10) is 150mm and the spacing is 1000mm. The pumped concrete (13) is assisted by the disc buckle operating frame (11) for pouring. The micro-expansion concrete (14) is poured when the pouring surface is 600mm away from the bottom surface of the permanent and temporary combined ring frame beam body (2).

8. The composite waterproof structure of the permanent and temporary combined ring frame beam and sidewall grouting of the shield tunnel shaft according to claim 6, characterized in that: After the galvanized grouting steel pipe (9) is connected to the ball valve, a single liquid grout is injected through the ground grouting pump, and observation holes are set at 5m intervals at the grouting port.

9. The composite waterproof structure of the permanent and temporary combined ring frame beam and sidewall grouting of the shield tunnel shaft according to claim 1, characterized in that: The overlap between the waterstop (5) and the PVC waterproof membrane (4) is hot-melt welded with a hot air gun. The density of the cement slurry filling layer (15) is achieved by multiple dynamic groutings through the repeatable grouting pipe (8) and the galvanized grouting steel pipe (9).

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