Waterproof sealing structure of interface between shield tunnel and subway station and construction method

Abstract

The application provides a shield tunnel and subway station interface waterproof sealing structure and a construction method, and belongs to the technical field of subway engineering. The structure is composed of a pre-buried steel ring, an annular steel frame, an omega-shaped waterproof belt, a filler, a press ring sealing concrete around a ring beam, a shield tunnel outer ring segment, a shield synchronous grouting layer and a diaphragm wall. The application has the advantages of simple structure, reasonable design and wide application range. It is a dynamic seal that can absorb the structural settlement difference at the interface between the shield tunnel and the subway station. Compared with the traditional ring beam sealing method, the application has better sealing effect, higher stability and durable sealing structure. It can absorb the displacement between structures caused by structural expansion or shrinkage due to temperature changes and settlement. The application overcomes the limitations of the traditional sealing method for the shield tunnel and subway station interface under poor geological conditions such as water-rich sand layer and easy structural settlement. It solves the problem of water leakage at the interface of the traditional sealing method.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of subway engineering, and particularly discloses a shield tunnel and subway station interface waterproof sealing structure and a construction method. BACKGROUND

[0002] At present, with the rapid development of domestic subway construction technology and the increase of urban subway demand, the proportion of shield tunnel and subway station construction is gradually increasing. Shield tunnel and subway station engineering inevitably involves two structure interface sealing construction. The traditional interface method is to make post-poured belt concrete around the beam. The waterproof sealing operation of the post-poured belt construction joint of the structure interface is difficult to construct, the sealing effect is not ideal, and the durability is low. In the water-rich stratum, especially when the permeability coefficient is large, the water stop belt bears high water pressure. At the same time, due to the temperature change, the structure expands or shrinks, and the displacement between structures caused by different degrees of settlement leads to the displacement failure of the water stop belt at the interface, and the concrete cracks and leaks water. Only by injecting chemical compounds or other waterproof materials can the sealing be achieved, which brings risks to construction safety and construction period, and directly increases the construction cost. SUMMARY

[0003] The application provides a shield tunnel and subway station interface waterproof sealing structure and a construction method to solve the problems of interface sealing structure of shield tunnel and subway station due to high underground water pressure, temperature change leading to structure expansion or shrinkage, structure settlement to different degrees, and interface construction joint water leakage and construction safety hazards.

[0004] The shield tunnel and subway station interface waterproof sealing structure comprises a pre-buried steel ring, an annular steel frame, an omega-shaped waterproof belt, a filler and a compression ring. The pre-buried steel ring is used for fixing on the circumferential inner side of the concrete ring beam. The annular steel frame comprises an axial connecting ring, a circumferential inner connecting ring fixed on the circumferential inner side of the axial connecting ring and a circumferential outer connecting ring fixed on the outer side of the axial connecting ring. The circumferential inner connecting ring and the circumferential outer connecting ring are located on the same side of the axial connecting ring. The axial connecting ring is used for fixing on the axial outer end surface of the outer segment of the shield tunnel. The omega-shaped waterproof belt is fixed on the pre-buried steel ring and the circumferential outer connecting ring respectively, and the opening is circumferentially outward. The compression ring comprises an axial compression ring, a circumferential inner compression ring fixed on the circumferential inner side of the axial compression ring and a circumferential outer compression ring fixed on the outer side of the axial compression ring. The circumferential inner compression ring and the circumferential outer compression ring are located on the two sides of the axial compression ring. The circumferential inner compression ring is fixed on the circumferential inner connecting ring, and the circumferential outer compression ring is fixed on the pre-buried steel ring. The filler has heat preservation, moisture-proof and fireproof functions, and is filled in the space enclosed by the pre-buried steel ring, the annular steel frame, the omega-shaped waterproof belt and the compression ring.

[0005] Further, the shield tunnel and subway station interface waterproof sealing structure further comprises a fireproof and moistureproof lining ring, which is formed by splicing a plurality of L-shaped fireproof and moistureproof lining plates and is fixed on the axial compression ring and the circumferential inner compression ring; the compression ring is formed by splicing a plurality of compression plates.

[0006] Further, a plurality of bolt holes are arranged on the embedded steel ring in the circumferential direction, an anchor bolt I and an anchor bolt II and a threaded sleeve are fixed on the outer side in the circumferential direction, the threaded sleeve is fixed on the bolt hole, the anchor bolt I is directly connected with the embedded steel ring, the anchor bolt II is connected with the threaded sleeve, and an expansion waterstop is arranged between the anchor bolt I and the anchor bolt II.

[0007] Further, the two sides of the Ω-shaped waterproof belt are pressed on the embedded steel ring and the circumferential outer connecting ring by the pressing plates and the bolts, and the bolts connected with the embedded steel ring are screwed into the threaded sleeves; the Ω-shaped waterproof belt is a rubber waterproof belt, and the filler is rock wool.

[0008] Further, the shield synchronous grouting layer is arranged on the outer side of the shield tunnel outer ring segment in the circumferential direction; the diaphragm wall is arranged on the outer side of the shield synchronous grouting layer in the circumferential direction; the concrete ring beam is arranged on the outer side of the shield tunnel outer ring segment, the shield synchronous grouting layer and the diaphragm wall in the axial direction, and comprises an outer beam body and an inner beam body connecting the outer beam body and the diaphragm wall, wherein the inner diameter of the outer beam body is smaller than that of the inner beam body; the embedded steel ring is fixed on the inner side of the outer beam body in the circumferential direction; the shield tunnel outer ring segment, the shield synchronous grouting layer, the diaphragm wall, the concrete ring beam, the embedded steel ring, the annular steel frame and the Ω-shaped waterproof belt form a ring-shaped sealing test space.

[0009] The shield tunnel and subway station interface waterproof sealing construction method comprises the following steps:

[0010] S1, measuring and laying out on the diaphragm wall according to the construction drawing and design requirements to obtain the installation contour of the concrete ring beam steel ring;

[0011] S2, the components of the concrete ring beam steel ring are transported to the construction site for assembly, the concrete ring beam steel ring comprises an outer steel ring and an inner steel ring, the inner diameter of the outer steel ring is smaller than that of the inner steel ring, temporary steel supports are added on the inner side of the concrete ring beam steel ring in the radial direction and are welded and reinforced, and a support steel frame is installed at the bottom of the concrete ring beam steel ring;

[0012] S3, the embedded steel ring is installed on the outer side of the outer steel ring in the circumferential direction, the concrete ring beam steel ring carrying the embedded steel ring is hoisted to the designed position, the inner steel ring faces the shield tunnel outer ring segment, and the inner steel ring is fixed to the subway station bottom plate through the support steel frame;

[0013] S4, laying waterproof plates on the axial outer end face of the outer ring segment of the shield tunnel, the synchronous grouting layer of the shield and the diaphragm wall, if the outer ring segment of the shield tunnel is located outside the synchronous grouting layer of the shield and the diaphragm wall, the exposed part of the outer ring segment of the shield tunnel is also laid with waterproof plates, the concrete encircling beam steel ring is bound along the circumferential outer side of the concrete encircling beam, and is continuously bound with the steel bars on the axial outer end face of the diaphragm wall, the concrete encircling beam and the diaphragm wall are integrally and continuously poured, the concrete encircling beam is obtained after the concrete encircling beam steel ring and the formwork connected with the diaphragm wall are removed, the concrete encircling beam comprises an outer beam body and an inner beam body connected with the outer beam body and the diaphragm wall, the outer beam body is controlled by the outer steel ring, the inner beam body is controlled by the inner steel ring and the formwork connected with the inner steel ring and the diaphragm wall, the inner diameter of the outer beam body is smaller than that of the inner beam body, and the embedded steel ring is fixed on the circumferential inner side of the outer beam body;

[0014] S5, measuring the horizontal distance from the axial inner end face of the embedded steel ring to the axial outer end face of the outer ring segment of the shield tunnel, and adjusting the length of the outer ring segment of the shield tunnel according to the design installation distance of the Omega-shaped waterproof belt, so that the horizontal distance from the axial inner end face of the embedded steel ring to the axial outer end face of the outer ring segment of the shield tunnel is equal to the design installation of the Omega-shaped waterproof belt;

[0015] S6, installing waterproof plates on the circumferential inner side of the inner beam body of the concrete encircling beam and the connecting end face of the inner beam body and the outer beam body;

[0016] S7, installing an annular steel frame on the axial outer end face of the outer ring segment of the shield tunnel, the annular steel frame comprises an axial connecting ring, a circumferential inner connecting ring fixed on the circumferential inner side of the axial connecting ring and a circumferential outer connecting ring fixed on the outer side of the axial connecting ring, the circumferential inner connecting ring and the circumferential outer connecting ring are located on the same side of the axial connecting ring, and the axial connecting ring is fixed on the axial outer end face of the outer ring segment of the shield tunnel;

[0017] S8, installing an Omega-shaped waterproof belt, the Omega-shaped waterproof belt is fixed on the embedded steel ring and the circumferential outer connecting ring on both sides respectively, and the opening is circumferentially outward;

[0018] S9, injecting water into the annular sealing test space enclosed by the outer ring segment of the shield tunnel, the synchronous grouting layer of the shield, the diaphragm wall, the concrete encircling beam, the embedded steel ring, the annular steel frame and the Omega-shaped waterproof belt, and testing the sealing performance;

[0019] S10, install filler between the Ω-shaped waterproof strip and the annular steel frame. After the filler is installed, it is annular with an inner diameter equal to the inner diameter of the circumferential inner connecting ring of the annular steel frame. The axial boundary is outside the Ω-shaped waterproof strip. After the filler is tightened, install the pressure ring. The pressure ring includes an axial pressure ring, a circumferential inner pressure ring fixed on the circumferential inner side of the axial pressure ring, and a circumferential outer pressure ring fixed on the outer side of the axial pressure ring. The circumferential inner pressure ring and the circumferential outer pressure ring are located on both sides of the axial pressure ring. The circumferential inner pressure ring is fixed on the circumferential inner connecting ring, and the circumferential outer pressure ring is fixed on the pre-embedded steel ring.

[0020] Furthermore, in step S7, bolt holes are provided on the axial connecting ring, and screws are inserted into the positions corresponding to the bolt holes on the axial outer end face of the shield tunnel outer ring segment. When the annular steel frame is placed in place, the screw passes through the bolt holes and is fixed with nuts. Water-stop washers are provided between the nuts and the axial connecting ring, and water-stop linings are provided on the upper and lower sides of the screw at the contact gap between the axial connecting ring and the shield tunnel outer ring segment.

[0021] It also includes step S11, installing L-shaped fireproof and moisture-proof lining plates. The L-shaped fireproof and moisture-proof lining plates are fixed on the axial pressure ring and the circumferential inner pressure ring, sealing the gap between the axial connecting ring and the outer ring segment of the shield tunnel. Multiple L-shaped fireproof and moisture-proof lining plates are spliced ​​together to form a fireproof and moisture-proof lining ring.

[0022] Furthermore, in step S2, the mating surfaces of the steel ring components of the concrete ring beam are connected by bolts. After on-site assembly, the roundness is checked by surveyors. After confirming that the roundness is qualified, temporary steel supports are welded and fixed.

[0023] In step S3, a water pipe is installed at the top of the pre-embedded steel ring, and a water pipe and pressure gauge are installed at the bottom. Valves are installed on the water pipes.

[0024] In step S6, after treating the concrete surface with Sapir 670 mortar on the inner side of the inner beam of the concrete ring beam and the connection end face between the inner and outer beams, a temporary sealing film is applied, and then a waterproof membrane is installed.

[0025] In step S9, water is injected into the annular sealing test space from the bottom water pipe of the pre-embedded steel ring until a stable water flow is received from the top water pipe. The valve of the top water pipe is closed, and the pressure is gradually increased to the preset pressure. The valve of the bottom water pipe is closed, and the pressure change of the pressure gauge is recorded within the preset time. If there is no pressure change, it means that the sealing is qualified and the next step is carried out. Otherwise, the cause is checked and dealt with until the sealing is qualified.

[0026] Furthermore, in step S5, the horizontal distance from the inner end face of the pre-embedded steel ring to the outer end face of the outer ring segment of the shield tunnel is equal to the design installation distance of the Ω-shaped waterproof strip and is not adjusted.

[0027] The horizontal distance is greater than the design installation distance of the Ω-shaped waterproof strip, extending the outer ring segment of the shield tunnel.

[0028] The horizontal distance is less than the design installation distance of the Ω-shaped waterproof strip, and the excess part of the outer ring segment of the shield tunnel is cut;

[0029] In step S8, when installing the Ω-shaped waterproof strip, first fix its top, then fix it alternately from top to bottom in sequence. The two sides of the Ω-shaped waterproof strip are pressed onto the pre-embedded steel ring and the circumferential outer connecting ring by clamping plates and bolts respectively. The bolts are tightened in batches and stages to make the Ω-shaped waterproof strip evenly stressed on the entire circumference.

[0030] Furthermore, in step S3, the pre-embedded steel ring is made of galvanized steel sheet rolled and processed. Its outer diameter is equal to the outer diameter of the outer ring segment of the shield tunnel. It is divided into multiple components. Each component is equipped with two lifting lugs. Adjacent components are fixed by welding. The pre-embedded steel ring has multiple bolt holes along the circumference. Anchor bolt I, anchor bolt II and threaded sleeve are fixed on the outer circumference. The threaded sleeve is fixed on the bolt holes. Anchor bolt I is directly connected to the pre-embedded steel ring. Anchor bolt II is connected to the threaded sleeve. An expansion waterstop strip is installed between anchor bolt I and anchor bolt II.

[0031] In step S7, the annular steel frame is made of galvanized steel plate, and its outer diameter is equal to the outer diameter of the outer ring segment of the shield tunnel. It is divided into multiple components, and each component is equipped with two lifting lugs. Adjacent components are fixed by welding.

[0032] In step S8, the Ω-shaped waterproof tape consists of two nylon layers, with an inner and outer SBR rubber protective layer covering it.

[0033] In step S10, the filler is rock wool;

[0034] The pressure ring is composed of multiple pressure plates spliced ​​together. The pressure plates are made of hot-dip galvanized steel plates and are fixed to the annular steel frame and the pre-embedded steel ring by bolts.

[0035] In step S11, the L-shaped fireproof and moisture-proof lining board is a gypsum board containing glass fiber, which is fixed to the pressure ring by galvanized screws.

[0036] The present invention has the following beneficial effects:

[0037] This invention has a simple structure, reasonable design, and wide applicability. It is a dynamic seal that can absorb the structural settlement difference at the interface of shield tunnels and subway stations.

[0038] Compared with the traditional rear-mounted ring beam sealing method, this invention has a better sealing effect, higher stability, and more durable sealing structure. It can absorb the expansion or contraction of the structure caused by temperature changes and the displacement between structures caused by settlement. It overcomes the limitations of traditional sealing methods in shield tunnels and subway station interfaces under poor geological conditions such as water-rich sand layers and structures prone to settlement, and effectively solves the problem of water leakage at the interface of traditional sealing methods. Attached Figure Description

[0039] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0040] Figure 1 The front view of the waterproof sealing structure at the interface between the shield tunnel and the subway station;

[0041] Figure 2 for Figure 1 A sectional view along the AA direction;

[0042] Figure 3 for Figure 2 Enlarged view of the lower half;

[0043] Figure 4 This is a schematic diagram of the installation of the Ω-shaped waterproof tape;

[0044] Figure 5 This is a schematic diagram showing the installation of the pre-embedded steel ring in the steel ring of the concrete ring beam;

[0045] Figure 6 for Figure 5 Enlarged view of section B.

[0046] In the diagram: 1-Outer ring segment of shield tunnel; 2-Synchronous grouting layer of shield tunnel; 3-Diaphragm wall; 4-Concrete ring beam; 5-Embedded steel ring; 6-Annular steel frame; 7-Ω-shaped waterproof strip; 8-Pressure ring; 9-Fireproof and moisture-proof lining ring; 10-Anchor bolt I; 11-Anchor bolt II; 12-Threaded sleeve; 13-Expansion waterstop strip; 14-Pressure plate; 15-Bolt; 16-Rock wool; 17-Water pipe; 18-Screw rod; 19-Waterstop washer; 20-Waterstop lining; 21-Waterproof membrane; 22-Steel ring of concrete ring beam; 23-Temporary steel support; 24-Supporting steel frame. Detailed Implementation

[0047] The technical solution of the present invention will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. 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.

[0048] Example 1

[0049] This embodiment provides a waterproof sealing structure for the interface between a shield tunnel and a subway station, including a shield tunnel outer ring segment 1, a shield synchronous grouting layer 2, a diaphragm wall 3, a concrete ring beam 4, a pre-embedded steel ring 5, a ring steel frame 6, an Ω-shaped waterproof strip 7, filler and pressure ring 8.

[0050] The shield tunnel synchronous grouting layer 2 surrounds the outer circumferential outer side of the shield tunnel outer ring segment 1; the diaphragm wall 3 surrounds the outer circumferential outer side of the shield tunnel synchronous grouting layer 2; the concrete ring beam 4 is located axially outside the shield tunnel outer ring segment 1, the shield tunnel synchronous grouting layer 2, and the diaphragm wall 3. The concrete ring beam 4 is installed outside the shield tunnel outer ring segment 1 along the outer edge of the concrete ring beam steel ring 22 after the concrete ring beam steel ring 22 is fixed to the subway station floor slab that provides support and the diaphragm wall 3 that provides support and maintenance. The cast-in-place annular concrete structure, continuously cast and connected to the axial outer end face of the subway station end wall (mainly including the outer ring segment 1 of the shield tunnel, the shield synchronous grouting layer 2, and the diaphragm wall 3), comprises an outer beam and an inner beam connecting the outer beam and the diaphragm wall 3. The inner diameter of the outer beam is smaller than that of the inner beam. A pre-embedded steel ring 5 is fixed to the circumferential inner side of the outer beam. The annular steel frame 6 includes an axial connecting ring and a circumferential inner connecting ring fixed to the circumferential inner side of the axial connecting ring. The ring and the circumferential outer connecting ring fixed to the outside of the axial connecting ring, the circumferential inner connecting ring and the circumferential outer connecting ring are located on the same side of the axial connecting ring; the axial connecting ring is used to fix it to the axial outer end face of the shield tunnel outer ring segment 1; the two sides of the Ω-shaped waterproof strip 7 are respectively fixed to the pre-embedded steel ring 5 and the circumferential outer connecting ring, with the opening facing outward in the circumferential direction; the shield tunnel outer ring segment 1, shield synchronous grouting layer 2, diaphragm wall 3, concrete ring beam 4, pre-embedded steel ring 5, ring steel frame 6 and Ω-shaped waterproof strip 7 The ring-shaped sealing test space is formed by the pressure ring 7, which includes an axial pressure ring, an inner circumferential pressure ring fixed to the inner side of the axial pressure ring, and an outer circumferential pressure ring fixed to the outer side of the axial pressure ring. The inner and outer circumferential pressure rings are located on both sides of the axial pressure ring. The inner circumferential pressure ring is fixed to the inner circumferential connecting ring, and the outer circumferential pressure ring is fixed to the pre-embedded steel ring 5. The filler has the functions of heat preservation, moisture protection, and fire prevention, and is filled in the space formed by the pre-embedded steel ring 5, the annular steel frame 6, the Ω-shaped waterproof strip 7, and the pressure ring 8.

[0051] Furthermore, the aforementioned waterproof sealing structure for the interface between the shield tunnel and the subway station also includes a fireproof and moisture-proof liner ring 9, which is composed of multiple L-shaped fireproof and moisture-proof liner plates and is fixed on the axial pressure ring and the circumferential inner pressure ring; the pressure ring 8 is composed of multiple pressure plates.

[0052] Furthermore, multiple bolt holes are provided on the pre-embedded steel ring 5 along the circumferential direction. Anchor bolt I 10, anchor bolt II 11 and threaded sleeve 12 are fixed on the outer side of the circumference. The threaded sleeve 12 is welded and fixed on the bolt holes. Anchor bolt I 10 is directly welded to the pre-embedded steel ring 5. Anchor bolt II 11 is connected to the threaded sleeve 12. An expansion waterstop strip 13 is installed between anchor bolt I 10 and anchor bolt II 11.

[0053] Furthermore, the two sides of the Ω-shaped waterproof strip 7 are pressed onto the pre-embedded steel ring 5 and the circumferential outer connecting ring by the clamping plate 14 and the bolt 15 respectively, and the bolt 15 connected to the pre-embedded steel ring 5 is screwed into the threaded sleeve 12; the Ω-shaped waterproof strip 7 is a rubber waterproof strip and the filler is rock wool 16.

[0054] Furthermore, a water pipe 17 is installed on the top of the pre-embedded steel ring 5, and a water pipe 17 and a pressure gauge are installed on the bottom. Valves are installed on the water pipe 17. The water pipe 17 is connected to the annular sealing test space and is used to inject water into the annular sealing test space to test the sealing performance.

[0055] Furthermore, bolt holes are provided on the axial connecting ring of the annular steel frame 6. A screw 18 is inserted into the outer axial end face of the shield tunnel outer ring segment 1 at the position corresponding to the bolt hole. The screw 18 passes through the bolt hole and the annular steel frame 6 is fixed to the shield tunnel outer ring segment 1 by a nut. A water-stop washer 19 is provided between the nut and the axial connecting ring. Water-stop pads 20 are provided on the upper and lower sides of the screw 18 at the contact gap between the axial connecting ring and the shield tunnel outer ring segment 1.

[0056] Furthermore, waterproof membrane 21 is laid on the outer end face of the shield tunnel outer ring segment 1, the shield synchronous grouting layer 2 and the diaphragm wall 3, as well as the part of the shield tunnel outer ring segment 1 located outside the shield synchronous grouting layer 2 and the diaphragm wall 3. Waterproof membrane 21 is also laid on the inner circumferential side of the inner beam of the concrete ring beam 4 and on the connection end face between the inner beam and the outer beam.

[0057] Example 2

[0058] Taking a light rail station as an example, this paper describes the specific steps of the waterproof sealing construction method for the interface between the shield tunnel and the subway station. The light rail station measures 22m × 23.15m and has a depth of 25.24m. The geology of the diaphragm wall 1, from top to bottom, consists of fine sand, clayey sand, partially cohesive fine sand, and the K-1 and K-2 strata, which are unique to the construction area. These strata are uneven in hardness and highly permeable. The unique strata of the construction area are a mixture of sand and calcareous sandstone, containing a small amount of cemented granular soil. They can be further subdivided into K-1 to K-4, with K-4 having the highest strength. K-1 mainly consists of fine and medium sand; the fine sand content in the sample is approximately 0-20%, while the coarse sand and medium gravel content is approximately 5%-40%, with a permeability coefficient of 5 × 10⁻⁶. -4 ~5×10 -2 K-2 is similar to K-1 in composition, with the coarse particle content increasing by about 10% compared to K-1. The gradation curves of K-3 and K4 are similar to those of K-1 and K-2, except that the proportion of fine sand is smaller. The groundwater level outside the diaphragm wall 1 is relatively high, located 1.4m above the tunnel arch, and the water pressure is relatively high.

[0059] The above-mentioned waterproof sealing construction method for the interface between a shield tunnel and a subway station involves pouring a concrete ring beam 4 around the outer ring segment 1 of the shield tunnel. The concrete ring beam 4 and the diaphragm wall 3 of the subway station are poured continuously as a whole, so that all the water on the subway station end wall and the outer side of the shield tunnel outer ring segment 1 is collected between the concrete ring beam 4 and the shield tunnel outer ring segment 1. The specific steps include the following.

[0060] S1. Based on the construction drawings and design requirements, the installation outline of the concrete ring beam steel ring 22 is obtained by measuring and setting out on the diaphragm wall 3.

[0061] S2, the components of the concrete ring beam steel ring 22 are transported to the construction site and assembled. The concrete ring beam steel ring 22 includes an outer steel ring and an inner steel ring. The inner diameter of the outer steel ring is smaller than that of the inner steel ring. The mating surfaces of the components of the concrete ring beam steel ring 22 are connected by bolts. After on-site assembly, the roundness is checked by surveyors. After confirming that the roundness is qualified, temporary steel supports 23 are added radially inward to the circumference of the concrete ring beam steel ring 22 and welded for reinforcement. A support steel frame 24 is installed at the bottom of the concrete ring beam steel ring 22.

[0062] S3, a pre-embedded steel ring 5 is installed along the outer circumference of the outer steel ring. The pre-embedded steel ring 5 is made of galvanized steel sheet and its outer diameter is equal to that of the outer ring segment 1 of the shield tunnel. It is divided into multiple components, each of which is equipped with two lifting lugs. Adjacent components are fixed by welding to enhance the waterproof sealing effect. Multiple bolt holes are provided on the pre-embedded steel ring 5 along the circumference. Anchor bolts I10, II11 and threaded sleeves 12 are fixed on the outer circumference. The threaded sleeves 12 are fixed on the bolt holes. Anchor bolts I10 are directly welded to the pre-embedded steel ring 5. Anchor bolts II11 are connected to the threaded sleeves 12. Anchor bolts I10 and II11 are both pre-embedded in the poured concrete ring beam 4. An expansion waterstop strip 13 is installed between anchor bolts I10 and II11. A water pipe 17 is installed on the top of the pre-embedded steel ring 5 and a pressure gauge is installed on the bottom of the water pipe 17. Valves are installed on the water pipes 17. The embedded steel ring 5 is temporarily fixed to the concrete ring beam steel ring 22 with bolts. The inner surface of the embedded steel ring 5 is close to the outer surface of the concrete ring beam steel ring 22, forming a ring within a ring. The concrete ring beam steel ring 22 carrying the embedded steel ring 5 is hoisted to the design position as a whole, with the inner steel ring facing the outer ring segment 1 of the shield tunnel, and fixed to the subway station floor slab by the supporting steel frame 24.

[0063] S4. Waterproof membrane 21 is laid on the outer end face of the shield tunnel outer ring segment 1, the shield synchronous grouting layer 2, and the diaphragm wall 3. If the shield tunnel outer ring segment 1 is located outside the shield synchronous grouting layer 2 and the diaphragm wall 3, the exposed part of the shield tunnel outer ring segment 1 is also covered with waterproof membrane 21. The steel ring of the concrete ring beam is tied outward along the circumference of the steel ring 22 of the concrete ring beam, and continuously tied with the steel ring of the diaphragm wall 3 on the outer end face. The formwork is closed and the overall continuous pouring of the concrete ring beam 22 and the diaphragm wall 3 is completed. After the concrete strength reaches the standard, the steel ring 22 of the concrete ring beam and the formwork connected to the diaphragm wall 3 are removed to obtain the concrete ring beam 4 connected to the diaphragm wall 3. The overall continuous pouring enhances the sealing performance. The concrete ring beam 4 includes an outer beam and an inner beam that connects the outer beam and the diaphragm wall 3. The outer beam is controlled by an outer steel ring, and the inner beam is controlled by an inner steel ring and a template that connects the inner steel ring and the diaphragm wall 3. The inner diameter of the outer beam is smaller than the inner diameter of the inner beam, and the embedded steel ring 5 is fixed on the circumferential inner side of the outer beam.

[0064] S5. Measure the horizontal distance from the inner axial end face of the embedded steel ring 5 to the outer axial end face of the shield tunnel outer ring segment 1. Adjust the length of the shield tunnel outer ring segment 1 according to the designed installation distance of the Ω-shaped waterproof strip 7, so that the horizontal distance from the inner axial end face of the embedded steel ring 5 to the outer axial end face of the shield tunnel outer ring segment 1 is equal to the designed installation distance of the Ω-shaped waterproof strip 7.

[0065] The horizontal distance from the inner end face of the pre-embedded steel ring 5 to the outer end face of the outer ring segment 1 of the shield tunnel is equal to the design installation distance of the Ω-shaped waterproof strip 7 and is not adjusted.

[0066] If the horizontal distance is greater than the design installation distance of the Ω-shaped waterproof strip 7, and the difference is not greater than value a, the outer ring segment 1 of the shield tunnel is extended, and the extended part is grouted with non-shrink cement grout, with no additional reinforcement; if the difference is between values ​​a and b, the outer ring segment 1 of the shield tunnel is extended, and the extended part is poured with B60 non-shrink concrete, with additional reinforcement; if the difference is value b or above, the outer ring segment 1 of the shield tunnel is extended, and the extended part is poured with B60 non-shrink concrete, with additional reinforcement; if value a is less than value b.

[0067] The horizontal distance is less than the design installation distance of the Ω-shaped waterproof strip 7, and the excess part of the outer ring segment 1 of the shield tunnel is cut.

[0068] S6. After treating the concrete surface with Sapir 670 mortar on the inner side of the inner beam of the concrete ring beam 4 and the connection end face between the inner and outer beams, apply a temporary sealing film MB-2K and then install a waterproof membrane 21 to prevent groundwater from entering the annular sealing test space in step S9 from the shield synchronous grouting layer 2, which would cause the test to fail.

[0069] S7. An annular steel frame 6 is installed on the outer axial end face of the outer ring segment 1 of the shield tunnel. The annular steel frame 6 is made of galvanized steel plate, and its outer diameter is equal to that of the outer diameter of the outer ring segment 1 of the shield tunnel. It is divided into multiple components, and each component is equipped with two lifting lugs. Adjacent components are fixed by welding. The annular steel frame 6 includes an axial connecting ring, an inner circumferential connecting ring fixed on the inner circumferential side of the axial connecting ring, and an outer circumferential connecting ring fixed on the outer circumferential side of the axial connecting ring. The inner circumferential connecting ring and the outer circumferential connecting ring are located on the same side of the axial connecting ring. The axial connecting ring is fixed on the outer axial end face of the outer ring segment 1 of the shield tunnel, and bolt holes are opened on the axial connecting ring. A screw rod 18 is inserted into the outer end face of the shield tunnel outer ring segment 1 at the position corresponding to the bolt hole. When the annular steel frame 6 is placed in place, the screw rod 18 passes through the bolt hole and is fixed with a nut. A water-stop washer 19 is set between the nut and the axial connecting ring. Water-stop pads 20 are provided on the upper and lower sides of the screw rod 18 at the contact gap between the axial connecting ring and the shield tunnel outer ring segment 1. While blocking water, the annular steel frame 6 can be evenly stressed on the entire circumference.

[0070] S8, Install the Ω-shaped waterproof strip 7, with the opening facing outwards. When installing the Ω-shaped waterproof strip 7, first fix its top, then alternately fix it from top to bottom, alternating left and right. The two sides of the Ω-shaped waterproof strip 7 are respectively pressed onto the pre-embedded steel ring 5 and the circumferential outer connecting ring by the clamping plate 14 and bolts 15. The bolts 15 connected to the pre-embedded steel ring 5 are screwed into the threaded sleeve 12. Simultaneously, to further enhance the sealing, the bolts 15 are tightened in batches and stages, ensuring that the Ω-shaped waterproof strip 7 is evenly stressed throughout its circumference. The Ω-shaped waterproof strip 7 consists of two nylon layers, with an inner and outer SBR rubber protective layer, capable of absorbing axial displacement, radial movement, and / or rotation between the outer ring segment 1 of the shield tunnel and the concrete ring beam 4 of the subway station.

[0071] Gap closure is an axial movement that compresses the curvature of the Ω-shaped waterproof strip 7; similarly, increasing the gap will stretch the Ω-shaped waterproof strip 7 and limit it to its circumference, but the reinforcement of the Ω-shaped waterproof strip 7 can enhance its tensile strength.

[0072] Radial movement of the interface structure will cause lateral deformation of the Ω-shaped waterproof strip 7;

[0073] Rotation around the vertical axis of the structure causes one vertical section of the Ω-shaped waterproof strip 7 to be compressed and the other vertical section to be tensile. To increase its resistance to deformation, it can be pre-compressed.

[0074] S9 involves injecting water into the annular sealing test space formed by the outer ring segment 1 of the shield tunnel, the shield synchronous grouting layer 2, the diaphragm wall 3, the concrete ring beam 4, the embedded steel ring 5, the annular steel frame 6, and the Ω-shaped waterproof strip 7, to test the sealing performance. The specific operation process is as follows:

[0075] Water is injected into the annular sealing test space from the bottom water pipe of the pre-embedded steel ring 5 until a stable water flow is received from the top water pipe. The valve of the top water pipe is closed, and the pressure is gradually increased to the preset pressure. The valve of the bottom water pipe is closed, and the pressure change of the pressure gauge is recorded within the preset time. If there is no pressure change, it means that the sealing is qualified and the next step is carried out. Otherwise, the cause is checked and dealt with until the sealing is qualified.

[0076] S10, install filler material between the Ω-shaped waterproof strip 7 and the annular steel frame 6. The filler material is rock wool 16. After the filler material is installed, it is annular. The inner diameter is equal to the inner diameter of the circumferential inner connecting ring of the annular steel frame 6. The axial boundary is outside the Ω-shaped waterproof strip 7. After the filler material is tightened, install the pressure ring 8. The pressure ring 8 is made of multiple pressure plates spliced ​​together. The pressure plates are made of hot-dip galvanized steel plates. The pressure ring 8 includes an axial pressure ring, a circumferential inner pressure ring fixed on the circumferential inner side of the axial pressure ring, and a circumferential outer pressure ring fixed on the outer side of the axial pressure ring. The circumferential inner pressure ring and the circumferential outer pressure ring are located on both sides of the axial pressure ring. The circumferential inner pressure ring is fixed to the circumferential inner connecting ring by bolts. The circumferential outer pressure ring is fixed to the pre-embedded steel ring 5 by bolts.

[0077] S11, Install L-shaped fireproof and moisture-proof lining boards. The L-shaped fireproof and moisture-proof lining boards are made of gypsum board containing glass fiber, which has excellent fire resistance and moisture resistance. The L-shaped fireproof and moisture-proof lining boards are fixed to the axial pressure ring and the circumferential inner pressure ring by galvanized screws, sealing the gap between the axial connecting ring and the outer ring segment 1 of the shield tunnel. The main function is to protect the water-stop lining 20. Multiple L-shaped fireproof and moisture-proof lining boards are spliced ​​together to form a fireproof and moisture-proof lining ring 9.

[0078] The waterproofing and sealing work on both end walls of the station and the shield tunnel interface was successfully completed. No leakage occurred after installation, demonstrating good sealing effect, high stability, and durable sealing structure. It can absorb structural expansion or contraction caused by temperature changes and displacement between structures caused by settlement. It overcomes the limitations of traditional construction methods in shield tunnels and subway station interfaces in strata with high-pressure groundwater and structural settlement, and solves the problem of water leakage at interfaces using traditional construction methods.

[0079] Finally, it should be noted that 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 the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features; and these modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of the present invention.

Claims

1. A method for waterproofing and sealing the interface between a shield tunnel and a subway station, characterized in that, Includes the following steps: S1. Based on the construction drawings and design requirements, the installation outline of the steel ring of the concrete ring beam is obtained by measuring and setting out on the diaphragm wall. S2, The components of the concrete ring beam steel ring are transported to the construction site and assembled. The concrete ring beam steel ring includes an outer steel ring and an inner steel ring. The inner diameter of the outer steel ring is smaller than that of the inner steel ring. Temporary steel supports are added along the radial direction of the concrete ring beam steel ring and welded for reinforcement. A support steel frame is installed at the bottom of the concrete ring beam steel ring. S3, install the pre-embedded steel ring along the outer circumference of the outer steel ring, and hoist the concrete ring beam steel ring carrying the pre-embedded steel ring to the design position as a whole. The inner steel ring faces the outer ring segment of the shield tunnel and is fixed to the bottom plate of the subway station by the support steel frame. S4. Lay waterproof membrane on the outer end face of the shield tunnel outer ring segment, shield synchronous grouting layer and diaphragm wall. If the shield tunnel outer ring segment is located outside the shield synchronous grouting layer and diaphragm wall, the exposed part of the shield tunnel outer ring segment is also covered with waterproof membrane. Tie the concrete ring beam reinforcement along the outer circumference of the steel ring of the concrete ring beam and continuously tie it with the reinforcement of the outer end face of the diaphragm wall. Close the formwork and complete the overall continuous pouring of the concrete ring beam and diaphragm wall. After the concrete strength reaches the standard, remove the concrete ring beam steel ring and the formwork connected to the diaphragm wall to obtain the concrete ring beam connected to the diaphragm wall. The concrete ring beam includes the outer beam body and the inner beam body connecting the outer beam body and the diaphragm wall. The outer beam body is controlled by the outer steel ring, and the inner beam body is controlled by the inner steel ring and the formwork connecting the inner steel ring and the diaphragm wall. The inner diameter of the outer beam body is smaller than the inner diameter of the inner beam body. The pre-embedded steel ring is fixed on the inner circumference of the outer beam body. S5. Measure the horizontal distance from the inner end face of the embedded steel ring to the outer end face of the shield tunnel outer ring segment. Adjust the length of the shield tunnel outer ring segment according to the design installation distance of the Ω-shaped waterproof strip so that the horizontal distance from the inner end face of the embedded steel ring to the outer end face of the shield tunnel outer ring segment is equal to the design installation distance of the Ω-shaped waterproof strip. S6, Install waterproof membrane on the inner circumferential side of the inner beam of the concrete ring beam and on the connecting end face of the inner beam and the outer beam; S7. An annular steel frame is installed on the axial outer end face of the outer ring segment of the shield tunnel. The annular steel frame includes an axial connecting ring, an inner circumferential connecting ring fixed on the inner side of the axial connecting ring, and an outer circumferential connecting ring fixed on the outer side of the axial connecting ring. The inner circumferential connecting ring and the outer circumferential connecting ring are located on the same side of the axial connecting ring. The axial connecting ring is fixed on the axial outer end face of the outer ring segment of the shield tunnel. S8, Install Ω-shaped waterproof tape. The two sides of the Ω-shaped waterproof tape are fixed to the pre-embedded steel ring and the circumferential outer connecting ring, respectively, with the opening facing outwards circumferentially. S9. Water is injected into the annular sealing test space formed by the outer ring segment of the shield tunnel, the shield synchronous grouting layer, the diaphragm wall, the concrete ring beam, the embedded steel ring, the annular steel frame and the Ω-shaped waterproof strip to test the sealing performance. S10, install filler between the Ω-shaped waterproof strip and the annular steel frame. After the filler is installed, it is annular with an inner diameter equal to the inner diameter of the circumferential inner connecting ring of the annular steel frame. The axial boundary is located outside the Ω-shaped waterproof strip. After the filler is tightened, install the pressure ring. The pressure ring includes an axial pressure ring, a circumferential inner pressure ring fixed on the circumferential inner side of the axial pressure ring, and a circumferential outer pressure ring fixed on the outer side of the axial pressure ring. The circumferential inner pressure ring and the circumferential outer pressure ring are located on both sides of the axial pressure ring. The circumferential inner pressure ring is fixed on the circumferential inner connecting ring, and the circumferential outer pressure ring is fixed on the pre-embedded steel ring.

2. The waterproof sealing construction method for the interface between a shield tunnel and a subway station according to claim 1, characterized in that, In step S7, bolt holes are opened on the axial connecting ring. A screw is inserted into the position corresponding to the bolt hole on the axial outer end face of the shield tunnel outer ring segment. When the annular steel frame is placed in place, the screw passes through the bolt hole and is fixed by a nut. A water-stop washer is set between the nut and the axial connecting ring. Water-stop pads are set on the upper and lower sides of the screw at the contact gap between the axial connecting ring and the shield tunnel outer ring segment. It also includes step S11, installing L-shaped fireproof and moisture-proof lining plates. The L-shaped fireproof and moisture-proof lining plates are fixed on the axial pressure ring and the circumferential inner pressure ring, sealing the gap between the axial connecting ring and the outer ring segment of the shield tunnel. Multiple L-shaped fireproof and moisture-proof lining plates are spliced ​​together to form a fireproof and moisture-proof lining ring.

3. The waterproof sealing construction method for the interface between a shield tunnel and a subway station according to claim 2, characterized in that, In step S2, the mating surfaces of the steel ring components of the concrete ring beam are connected by bolts. After on-site assembly, the roundness is checked by surveyors. After confirming that the roundness is qualified, temporary steel supports are welded and fixed. In step S3, a water pipe is installed at the top of the pre-embedded steel ring, and a water pipe and pressure gauge are installed at the bottom. Valves are installed on the water pipes. In step S6, after treating the concrete surface with Sapir 670 mortar on the inner side of the inner beam of the concrete ring beam and the connection end face between the inner and outer beams, a temporary sealing film is applied, and then a waterproof membrane is installed. In step S9, water is injected into the annular sealing test space from the bottom water pipe of the pre-embedded steel ring until a stable water flow is received from the top water pipe. The valve of the top water pipe is closed, and the pressure is gradually increased to the preset pressure. The valve of the bottom water pipe is closed, and the pressure change of the pressure gauge is recorded within the preset time. If there is no pressure change, it means that the sealing is qualified and the next step is carried out. Otherwise, the cause is checked and dealt with until the sealing is qualified.

4. The waterproof sealing construction method for the interface between a shield tunnel and a subway station according to claim 3, characterized in that, In step S5, the horizontal distance from the inner end face of the pre-embedded steel ring to the outer end face of the outer ring segment of the shield tunnel is equal to the design installation distance of the Ω-shaped waterproof strip and is not adjusted. The horizontal distance is greater than the design installation distance of the Ω-shaped waterproof strip, extending the outer ring segment of the shield tunnel. The horizontal distance is less than the design installation distance of the Ω-shaped waterproof strip, and the excess part of the outer ring segment of the shield tunnel is cut; In step S8, when installing the Ω-shaped waterproof strip, first fix its top, then fix it alternately from top to bottom in sequence. The two sides of the Ω-shaped waterproof strip are pressed onto the pre-embedded steel ring and the circumferential outer connecting ring by clamping plates and bolts respectively. The bolts are tightened in batches and stages to make the Ω-shaped waterproof strip evenly stressed on the entire circumference.

5. The waterproof sealing construction method for the interface between a shield tunnel and a subway station according to claim 4, characterized in that, In step S3, the embedded steel ring is made of galvanized steel sheet and its outer diameter is equal to that of the outer ring segment of the shield tunnel. It is divided into multiple components, each of which is equipped with two lifting lugs. Adjacent components are fixed by welding. The embedded steel ring has multiple bolt holes along the circumference. Anchor bolt I, anchor bolt II and threaded sleeve are fixed on the outer circumference. The threaded sleeve is fixed on the bolt holes. Anchor bolt I is directly connected to the embedded steel ring. Anchor bolt II is connected to the threaded sleeve. An expansion waterstop strip is installed between anchor bolt I and anchor bolt II. In step S7, the annular steel frame is made of galvanized steel plate, and its outer diameter is equal to the outer diameter of the outer ring segment of the shield tunnel. It is divided into multiple components, and each component is equipped with two lifting lugs. Adjacent components are fixed by welding. In step S8, the Ω-shaped waterproof tape consists of two nylon layers, with an inner and outer SBR rubber protective layer covering it. In step S10, the filler is rock wool; The pressure ring is composed of multiple pressure plates spliced ​​together. The pressure plates are made of hot-dip galvanized steel plates and are fixed to the annular steel frame and the pre-embedded steel ring by bolts. In step S11, the L-shaped fireproof and moisture-proof lining board is a gypsum board containing glass fiber, which is fixed to the pressure ring by galvanized screws.

6. The waterproof sealing construction method for the interface between a shield tunnel and a subway station according to claim 1, characterized in that, The waterproof sealing structure used at the interface between the shield tunnel and the subway station includes a pre-embedded steel ring, a ring-shaped steel frame, an Ω-shaped waterproof strip, filler, and a pressure ring; The pre-embedded steel ring is used to fix the concrete ring beam to the inner circumference. The annular steel frame includes an axial connecting ring, an inner circumferential connecting ring fixed to the inner side of the axial connecting ring, and an outer circumferential connecting ring fixed to the outer side of the axial connecting ring. The inner circumferential connecting ring and the outer circumferential connecting ring are located on the same side of the axial connecting ring. The axial connecting ring is used to fix the outer end face of the outer ring segment of the shield tunnel. The two sides of the Ω-shaped waterproof strip are fixed to the pre-embedded steel ring and the circumferential outer connecting ring, respectively, with the opening facing outward in the circumferential direction; The pressure ring includes an axial pressure ring, a circumferential inner pressure ring fixed to the circumferential inner side of the axial pressure ring, and a circumferential outer pressure ring fixed to the circumferential outer side of the axial pressure ring. The circumferential inner pressure ring and the circumferential outer pressure ring are located on both sides of the axial pressure ring. The circumferential inner pressure ring is fixed on the circumferential inner connecting ring, and the circumferential outer pressure ring is fixed on the pre-embedded steel ring. The filler has heat insulation, moisture-proof, and fireproof functions, and is filled in the space enclosed by the pre-embedded steel ring, the annular steel frame, the Ω-shaped waterproof strip, and the pressure ring.

7. The waterproof sealing construction method for the interface between a shield tunnel and a subway station according to claim 6, characterized in that, The waterproof sealing structure at the interface between the shield tunnel and the subway station also includes a fireproof and moisture-proof liner ring. The fireproof and moisture-proof liner ring is composed of multiple L-shaped fireproof and moisture-proof liner plates spliced ​​together and fixed on the axial pressure ring and the circumferential inner pressure ring. The pressure ring is made up of multiple pressure plates.

8. The waterproof sealing construction method for the interface between a shield tunnel and a subway station according to claim 7, characterized in that, Multiple bolt holes are provided along the circumference of the pre-embedded steel ring. Anchor bolt I, anchor bolt II and threaded sleeve are fixed on the outer side of the circumference. The threaded sleeve is fixed on the bolt holes. Anchor bolt I is directly connected to the pre-embedded steel ring. Anchor bolt II is connected to the threaded sleeve. An expansion waterstop strip is installed between anchor bolt I and anchor bolt II.

9. The waterproof sealing construction method for the interface between a shield tunnel and a subway station according to claim 8, characterized in that, The two sides of the Ω-shaped waterproof strip are pressed onto the pre-embedded steel ring and the circumferential outer connecting ring by clamping plates and bolts, respectively, and the bolts connected to the pre-embedded steel ring are screwed into the threaded sleeve; The Ω-shaped waterproof tape is a rubber waterproof tape, and the filler is rock wool.

10. The waterproof sealing construction method for the interface between a shield tunnel and a subway station according to any one of claims 6-9, characterized in that, The shield tunnel synchronous grouting layer surrounds the outer circumference of the outer ring segment of the shield tunnel; The diaphragm wall surrounds the outer periphery of the shield tunnel's synchronous grouting layer; The concrete ring beam is located on the axial outside of the outer ring segment of the shield tunnel, the shield synchronous grouting layer and the diaphragm wall. It includes the outer beam and the inner beam connecting the outer beam and the diaphragm wall. The inner diameter of the outer beam is smaller than the inner diameter of the inner beam. Pre-embedded steel rings are fixed to the inner circumferential side of the outer beam. The outer ring segments of the shield tunnel, the shield synchronous grouting layer, the diaphragm wall, the concrete ring beam, the embedded steel ring, the ring steel frame, and the Ω-shaped waterproof strip form a ring-shaped sealed test space.

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