A mortise and tenon type steel pipe segment lining structure of a man-made chamber repository and a construction method thereof

Abstract

The present application relates to the technical fields of tunnel lining construction, and discloses a mortise and tenon type steel pipe lining structure of artificial cavern storage and a construction method thereof, comprising surrounding rock, wall back grouting layer and lining pipe piece, and the lining pipe piece is formed by assembling a plurality of mortise and tenon type steel pipe pieces. The circumferential ends of the mortise and tenon type steel pipe piece are provided with circumferential tenon and circumferential mortise, and the longitudinal ends are provided with longitudinal tenon and longitudinal mortise, and a high polymer sealing layer is pre-arranged at the mortise and tenon connecting surface. The mortise and tenon type steel pipe piece is not provided with grouting holes, anchor rod holes or bolt holes penetrating the wall thickness. During construction, the open type TBM is used for tunneling, and the mortise and tenon type steel pipe piece is assembled in the shield tail, the wall back grouting layer is formed by synchronous grouting of the shield tail, and finally the high polymer sealing layer is applied on the inner surface of the lining pipe piece. The present application eliminates the air leakage hidden danger of the traditional pipe piece, and can significantly improve the overall sealing performance, assembly efficiency and connection reliability of the lining structure.

Description

Technical Field

[0001] This invention relates to the field of tunnel lining construction technology, specifically to a mortise and tenon steel segment lining structure for an artificial chamber storage facility and its construction method. Background Technology

[0002] Artificial chamber storage facilities are underground energy storage infrastructures constructed within deep underground rock matrices using engineering techniques such as directional excavation, support construction, and sealing and seepage prevention. These facilities can be applied to compressed air energy storage, hydrogen storage, ammonia storage, and multi-energy complementary energy storage scenarios, reducing reliance on natural geological conditions such as salt caverns. Currently, artificial chamber storage facilities are mostly constructed using the drill-and-blast method to form tunnel-type underground sealed chambers, employing a composite lining of concrete and steel. The surrounding rock primarily bears the internal pressure, while the lining mainly serves to seal and transfer loads.

[0003] In the aforementioned composite lining methods, the steel lining sealing layer is a crucial structure for preventing gas leakage within the storage chamber. However, construction involves welding large-diameter steel lining assemblies within the tunnel and completing concrete lining construction in a confined space, making the process quite challenging. The TBM method, with its advantages of rapid construction, high support efficiency, and minimal disturbance to the surrounding rock, has been increasingly adopted in the construction of artificial chamber storage facilities. Existing technologies include integrated TBM-based lining and sealing storage structures, where steel-concrete composite segments support the surrounding rock during construction and serve as the sealing structure after welding.

[0004] However, under high-pressure cyclic loading, existing reinforced concrete tunnel segments experience delamination between the steel plates and concrete, affecting their synergistic stress-bearing effect. The circumferential and longitudinal connections of existing segments are typically bolted, involving numerous assembly steps and complex sealing treatment at the joints. Furthermore, the grouting holes, anchor holes, or bolt holes on the segments are structurally weak points extending through the segment wall thickness; subsequent sealing materials may compromise sealing reliability due to differences in material properties, long-term aging, or high-pressure cyclic loading. Therefore, it is necessary to propose a lining structure and construction method suitable for artificial chamber storage facilities to reduce the leakage risks associated with through-holes in the segments and improve the assembly efficiency, connection reliability, and sealing performance of the lining segments. Summary of the Invention

[0005] To address the shortcomings of existing technologies, this invention provides a tenon-and-mortise steel segment lining structure for artificial chamber storage facilities and its construction method. This solves the problems of existing artificial chamber storage facilities using TBM construction lining structures, where the through holes of the segments are prone to leakage and weak points, bolted connection assembly is inefficient and sealing treatment is complex, making it difficult to meet the sealing and connection reliability requirements under high-pressure operating conditions.

[0006] To achieve the above objectives, the present invention provides the following technical solution: The first aspect of this invention provides a construction method for a tenon-and-mortise steel segment lining structure of an artificial chamber storage facility, comprising the following steps: The open-type TBM is modified by adding a segment assembly machine, a tail brush, and grouting pipes to the tail of the TBM shield. The open-type TBM shield is lengthened by 1.0–1.5 m. The segment assembly machine is located at the tail of the TBM shield to grab and assemble the tenon-and-mortise steel segments. There are at least three tail brushes, each using a combination of stainless steel wire and steel plate, with sealed chambers formed between each brush. There are at least four grouting pipes, evenly distributed circumferentially along the tail of the TBM shield. The outlets of the grouting pipes are located behind the tail brushes, and the front ends of the grouting pipes are connected to a grouting pump.

[0007] An open-face TBM was used to excavate the artificial chamber. During the tunneling process, advanced geological prediction technology was used to conduct advance exploration of the strata in front of the tunnel face. When adverse geological sections were found, the advanced drilling rig mounted on the TBM was used to perform advance grouting at the tunnel face. At the same time, a sealing ring (grout stop ring) was constructed in this section. The grouting material for the grout stop ring was cement-water glass double-liquid grout, with a cement grout water-cement ratio of 0.75 and a cement grout to water glass volume ratio of 1:1. The grouting pressure was controlled at 0.1-0.2 MPa, and the grouting time was 120-140 seconds per grouting session, with a 30-second interval between each grouting session.

[0008] When assembling the lining segments, the tenon-and-mortise steel segments are assembled in the following order: bottom, then sides, and finally top. Adjacent tenon-and-mortise steel segments within the same ring are connected by circumferential tenons and circumferential mortises. During assembly, the circumferential tenons are aligned with the circumferential mortises until the dovetail structure engages. Lining segments in adjacent rings are connected by longitudinal tenons and longitudinal mortises. The longitudinal tenon of the subsequent ring is inserted into the longitudinal mortis of the preceding ring and pressed together by the action of a hydraulic cylinder.

[0009] After the tenon-and-mortise steel pipe segments are assembled, while they are still within the shield tail sealing system, grout is injected through the grouting pipe into the annular gap between the outer wall of the tenon-and-mortise steel pipe segments and the surrounding rock to form the backfill grouting layer. The grout is a high-strength, micro-expansion cement-based grout, and the grouting pressure is controlled between 0.5 and 2.0 MPa. During the grouting process, the sealing effectiveness of the shield tail brush is maintained. The outlet of the grouting pipe is located behind the shield tail brush, allowing the grouting operation to be carried out while the tenon-and-mortise steel pipe segments are still within the shield tail protection range. The grout is injected from behind the shield tail and fills towards the working face.

[0010] After completing the assembly and backfilling of the tenon-and-mortise steel segments of one ring, the next cycle of tunneling continues. After the next cycle of tunneling is completed, the next ring of lining segments is assembled, and the longitudinal tenons of the subsequent ring are inserted into the longitudinal mortises of the previous ring. The tunneling, assembly, and backfilling steps are repeated until the installation and backfilling of the tenon-and-mortise steel segments of the nth ring are completed.

[0011] After all the tenon-and-mortise steel pipe segments are assembled and the wall grouting is completed, the polymer sealing material is applied to the inner surface of the lining segments. Before application, the inner surface of the lining segments is sandblasted to remove rust, achieving a cleanliness level of Sa2.5. Subsequently, the polymer sealing material, which cures on-site, is coated or sprayed onto the inner surface of the lining segments. The polymer sealing material primarily covers the tenon-and-mortise joints between the steel pipe segments, forming a continuous, flexible, sealed inner wall after curing.

[0012] A second aspect of the present invention provides a tenon-and-mortise steel pipe segment lining structure for an artificial chamber storage facility, comprising surrounding rock, a backfill grouting layer provided on the inner side of the surrounding rock, lining segments provided on the inner side of the backfill grouting layer, the lining segments comprising a plurality of tenon-and-mortise steel pipe segments, and a polymer sealing material provided on the inner surface of the lining segments.

[0013] The grouting layer behind the wall is located between the surrounding rock and the outer wall of the tenon-and-mortise steel pipe segment. It is formed by injecting grout into the annular gap between the outer wall of the tenon-and-mortise steel pipe segment and the surrounding rock through a grouting pipe. The grouting layer behind the wall fills the annular gap, creating a supporting fit between the surrounding rock and the lining segment.

[0014] Preferably, the tenon-and-mortise steel segment is an all-steel structure welded from high-strength steel plates, and the inner surface of the tenon-and-mortise steel segment is a continuous smooth steel plate surface. The tenon-and-mortise steel segment does not have grouting holes, anchor holes, or bolt holes that penetrate the wall thickness of the segment, structurally reducing leakage channels caused by through holes and lowering the complexity of subsequent sealing and plugging processes. The grout channel required for backfill grouting is provided by a grouting pipe located at the tail of the TBM shield. The outlet of the grouting pipe is located behind the tail brush. The grout enters the annular gap between the outer wall of the tenon-and-mortise steel segment and the surrounding rock through the grouting pipe to form a backfill grouting layer; therefore, the tenon-and-mortise steel segment body does not need to have through grouting holes.

[0015] Preferably, each end of the circumferential steel pipe segment is provided with a circumferential tenon and a circumferential mortise, and adjacent circumferential steel pipe segments within the same ring are connected by the circumferential tenon and the circumferential mortise. Both the circumferential tenon and the circumferential mortise are designed as dovetail structures, with the angles between the two beveled surfaces of the circumferential tenon and the two beveled surfaces of the circumferential mortise being 15° to 30°, and the fit clearance between the circumferential tenon and the circumferential mortise not exceeding 0.5 mm. Through the interlocking of the dovetail structure, adjacent circumferential steel pipe segments within the same ring can form a self-locking connection, improving tensile strength.

[0016] Preferably, the longitudinal ends of the tenon-and-mortise steel pipe segment are respectively provided with longitudinal tenons and longitudinal mortises, and the lining pipe segments of adjacent rings are connected by the longitudinal tenons and longitudinal mortises. Both the longitudinal tenons and longitudinal mortises are trapezoidal structures, with the height of the trapezoid being 1 / 4 to 1 / 3 of the thickness of the tenon-and-mortise steel pipe segment, and the fit clearance between the longitudinal tenons and longitudinal mortises not exceeding 0.5 mm. Through the fit of the trapezoidal structure, the longitudinal thrust generated during open-face TBM tunneling can be transmitted between the lining pipe segments of adjacent rings, while maintaining the assembly accuracy between adjacent rings.

[0017] Preferably, a polymer sealing layer is provided on the connection surface between the circumferential tenon and the circumferential mortise, and the polymer sealing layer is also provided on the connection surface between the longitudinal tenon and the longitudinal mortise. The polymer sealing layer is a pre-vulcanized butyl rubber layer or a EPDM rubber layer, with a thickness of 2–5 mm. The polymer sealing layer forms an initial seal after the tenon and mortise are engaged, ensuring a sealing structure at both the circumferential and longitudinal connections.

[0018] Preferably, the polymeric sealing material is an elastic polyurea or epoxy resin-based composite material with a thickness of 3–8 mm. The polymeric sealing material continuously covers the inner surface of the lining segments and the tenon-and-mortise joints between the steel segments, forming a continuous, flexible, sealed inner wall after curing. The polymeric sealing material, in conjunction with the polymeric sealing layer, ensures a seal on both the tenon-and-mortise joint surfaces and the inner surface of the lining segments.

[0019] Preferably, each ring of the lining segment includes one capping block, two adjacent blocks, and four standard blocks, wherein the capping block, the adjacent blocks, and the standard blocks are all tenon-and-mortise steel pipe segments. Thus, each ring of the lining segment is formed by assembling seven tenon-and-mortise steel pipe segments.

[0020] This invention provides a tenon-and-mortise steel segment lining structure for an artificial chamber storage facility and its construction method. It has the following beneficial effects: 1. This invention adopts a mortise and tenon steel pipe segment structure without setting grouting holes, anchor holes or bolt holes that penetrate through its wall thickness, reducing the through weak points on the pipe segment body. At the same time, a polymer sealing layer is set on the connection surface of the circumferential tenon and circumferential mortise and groove and the connection surface of the longitudinal tenon and longitudinal mortise and groove, and a polymer sealing material is set on the inner surface of the lining pipe segment, thereby improving the sealing performance of the lining structure from three aspects: the pipe segment body, the mortise and tenon connection surface and the inner surface coating.

[0021] 2. This invention uses circumferential tenons and circumferential mortises to connect adjacent mortise and tenon steel pipe segments within the same ring, and uses longitudinal tenons and longitudinal mortises to connect lining pipe segments of adjacent rings. This reduces the installation and tightening procedures required by traditional bolt connections, reduces the amount of on-site assembly operations, and helps to improve the assembly efficiency of mortise and tenon steel pipe segments.

[0022] 3. This invention incorporates a tail brush and grouting pipe at the tail of the TBM shield, with the outlet of the grouting pipe located behind the tail brush. This allows for synchronous grouting even before the tenon-and-mortise steel segments have detached from the tail sealing system. The grout is injected through the grouting pipe into the annular gap between the outer wall of the tenon-and-mortise steel segments and the surrounding rock, forming a backfill grouting layer. This improves the backfill filling effect and facilitates control of the grouting pressure.

[0023] 4. In this invention, both the circumferential tenon and the circumferential mortise are designed as dovetail structures. After they interlock, they can form a self-locking connection and improve the tensile strength. Both the longitudinal tenon and the longitudinal mortise are designed as trapezoidal structures, which can transmit the longitudinal thrust generated during open-face TBM tunneling between adjacent lining segments, thereby improving the connection reliability and structural integrity between lining segments.

[0024] 5. This invention uses a mortise and tenon type steel pipe segment with a high-strength steel plate welded together. Its inner surface is a continuous smooth steel plate surface. An elastic polyurea or epoxy resin-based composite material is applied to the inner surface of the lining pipe segment to form a polymer sealing material. This material can meet the sealing requirements under high-pressure operation conditions of artificial chamber storage tanks. At the same time, combined with the open-type TBM construction method, it is conducive to the continuous construction of tunneling, support, grouting and sealing of artificial chamber storage tanks. Attached Figure Description

[0025] Figure 1 This is a cross-sectional schematic diagram of the tenon-and-mortise type steel pipe lining structure of the present invention. Figure 2 This is a schematic diagram of the steel pipe segment assembly of the present invention; Figure 3 This is a schematic diagram of the circumferential tenon-and-mortise connection of the steel pipe segments according to the present invention; Figure 4 This is a schematic diagram of the longitudinal tenon-and-mortise connection of the steel pipe segments according to the present invention; Figure 5 This is a schematic diagram of the open-type TBM tail modification structure and the back wall grouting of the present invention.

[0026] Among them, 1. Surrounding rock; 2. Grouting layer behind the wall; 3. Tenon and mortise steel pipe segment; 31. Circumferential tenon; 32. Circumferential tenon groove; 33. Longitudinal tenon; 34. Longitudinal tenon groove; 35. Polymer sealing layer; 4. Polymer sealing material; 5. Shield tail brush; 6. Grouting pipe; 7. TBM shield tail. Detailed Implementation

[0027] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. 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.

[0028] Please see the appendix Figure 5 This embodiment provides a construction method for a tenon-and-mortise steel segment lining structure of an artificial chamber storage facility. This method is used to construct the aforementioned tenon-and-mortise steel segment lining structure of an artificial chamber storage facility. First, the open-type TBM is modified by adding a segment assembly machine, a tail brush, and grouting pipes to the TBM tail. Specifically, the open-type TBM shield is lengthened by 1.0–1.5 m to provide space for the support and assembly of the tenon-and-mortise steel segments 3. A segment assembly machine is added to the TBM tail 7, which is used to assemble the tenon-and-mortise steel segments 3. Automatic grabbing and assembly are performed to complete the installation of the lining segments. A tail brush 5 is added to the tail of the TBM shield 7. The tail brush 5 is set on the outer wall of the tail of the TBM shield 7 to maintain the sealing effectiveness of the tail sealing system during the synchronous grouting process. There are at least three tail brushes 5, and a sealed chamber is formed between each tail brush 5 to meet the sealing requirements during the synchronous grouting process. The tail brush 5 adopts a combination structure of stainless steel wire and steel plate. This combination structure is used to maintain the barrier and sealing effect of the tail brush 5 on the grout during the grouting process. A grouting pipe 6 is added to the tail of the TBM shield 7. The grouting pipe 6 is used to inject grout into the annular gap between the outer wall of the tenon-and-mortise steel segment 3 and the surrounding rock 1 before the tenon-and-mortise steel segment 3 has been removed from the tail of the shield. This grouting process is synchronous grouting at the tail of the shield. The grouting path is the grouting pump, the grouting pipe 6, and the annular gap between the outer wall of the tenon-and-mortise steel segment 3 and the surrounding rock 1. There are at least four grouting pipes 6, which are evenly distributed around the circumference of the TBM tail of the shield 7, so that the grout can enter the annular gap from different positions around the circumference of the TBM tail of the shield 7. The outlet of the grouting pipe 6 is located behind the tail brush 5. Through this outlet position, the grouting operation can be carried out while the tenon-and-mortise steel segment 3 is still within the protection range of the tail of the shield. The front end of the grouting pipe 6 is connected to the grouting pump, which is used to deliver grout to the grouting pipe 6, so that the grout enters the annular gap between the outer wall of the tenon-and-mortise steel segment 3 and the surrounding rock 1 through the grouting pipe 6.

[0029] Then, an open-face TBM was used to excavate the artificial chamber. After the cutterhead of the open-face TBM was started, full-face tunneling was carried out in the hard rock strata. During the tunneling, advanced geological prediction technology was used to conduct advance detection of the strata in front of the tunnel face. When adverse geological sections were found, the advanced drilling rig mounted on the TBM was used to perform advance grouting at the tunnel face. At the same time, a sealing ring (grout stop ring) was constructed in this section. The grouting material for the grout stop ring was cement-water glass double-liquid grout, with a cement grout water-cement ratio of 0.75 and a cement grout to water glass volume ratio of 1:1. The grouting pressure was controlled at 0.1-0.2 MPa, the grouting time was 120-140 seconds per grouting session, and the interval between each grouting session was 30 seconds. After each ring of tunneling, tenon-and-mortise steel pipe segments 3 were assembled. After each ring of tunneling, the segments were assembled sequentially by a segment assembly machine. Grab the tenon-and-mortise steel pipe segments 3 and assemble the lining segments. The tenon-and-mortise steel pipe segments 3 are assembled in the order of bottom, then sides, and then top to complete the installation of one ring of lining segments. Adjacent tenon-and-mortise steel pipe segments 3 in the same ring are connected by circumferential tenons 31 and circumferential mortises 32. During assembly, the circumferential tenons 31 are aligned with the circumferential mortises 32 until the dovetail structure is engaged. The lining segments of adjacent rings are connected by longitudinal tenons 33 and longitudinal mortises 34. The longitudinal tenons 33 of the next ring are inserted into the longitudinal mortises 34 of the previous ring and pressed under the action of the propulsion cylinder. After the tenon-and-mortise steel pipe segments 3 are assembled, before the tenon-and-mortise steel pipe segments 3 are removed from the shield tail sealing system, grout is injected into the annular gap between the outer wall of the tenon-and-mortise steel pipe segments 3 and the surrounding rock 1 through the grouting pipe 6 to form the back wall grouting layer 2. Grouting is carried out while the tenon-and-mortise steel segment 3 is still within the protection range of the shield tail. This helps to maintain controllable grouting pressure and allow the grout to fill the annular gap. The grout is a high-strength micro-expansion cement-based grout. The high-strength micro-expansion cement-based grout is used to fill the annular gap between the outer wall of the tenon-and-mortise steel segment 3 and the surrounding rock 1, and to form the back wall grouting layer 2. The grouting pressure is controlled between 0.5 and 2.0 MPa. By controlling the grouting pressure, the grout can diffuse and fill the annular gap between the outer wall of the tenon-and-mortise steel segment 3 and the surrounding rock 1. During the grouting process, the sealing effectiveness of the shield tail brush 5 is maintained. The shield tail brush 5 is used to cooperate with the grouting operation of the grouting pipe 6 to reduce the unexpected flow of grout at the TBM shield tail 7. After the assembly of one ring of tenon-and-mortise steel segment 3 and the back wall grouting are completed, the next cycle of tunneling continues. After the next cycle of tunneling is completed, the next ring of lining segments is assembled, and the longitudinal tenon 33 of the next ring is inserted into the longitudinal tenon 34 of the previous ring. The above tunneling, assembly, and backfill grouting steps are repeated until the installation and backfill grouting of the nth ring of tenon-and-mortise steel segments 3 are completed. Through repeated cycle construction, a continuous artificial chamber storage tenon-and-mortise steel segment lining structure can be formed. After all tenon-and-mortise steel segments 3 are assembled and backfill grouting is completed, a polymer sealing material 4 is applied to the inner surface of the lining segments. The polymer sealing material 4 is used to improve the sealing performance of the artificial chamber storage. Before applying the polymer sealing material 4, the inner surface of the lining segments is sandblasted to remove rust. The cleanliness after sandblasting and rust removal reaches Sa2.5 level to meet the requirements for coating or spraying the polymer sealing material 4.

[0030] Then, a polymer sealing material 4 that cures on-site is coated or sprayed onto the inner surface of the lining segments. The polymer sealing material 4 mainly covers the tenon and mortise joints between the steel segments, thereby further sealing the tenon and mortise joints. After curing, the polymer sealing material 4 forms a continuous flexible sealing inner wall. This continuous flexible sealing inner wall, together with the tenon and mortise steel segments 3, constitutes the sealing structure of the artificial chamber storage.

[0031] Please see the appendix Figure 1 and attached Figure 5 This invention provides a tenon-and-mortise steel segment lining structure for an artificial chamber storage facility, including surrounding rock. A backfill grouting layer 2 is provided on the inner side of the surrounding rock 1 outside the artificial chamber. The backfill grouting layer 2 is formed by injecting grout into the annular gap between the outer wall of the tenon-and-mortise steel segment 3 and the surrounding rock 1 through a grouting pipe 6 located at the tail of the TBM shield 7. The grouting pipe 6 is part of the tail grouting of the TBM shield and is not a through grouting hole located on the tenon-and-mortise steel segment 3. In this embodiment, the backfill grouting adopts the tail grouting method. The annular gap between the outer wall of the tenon-and-mortise steel pipe segment 3 and the surrounding rock 1 is filled by the grouting layer 2 behind the wall. Lining segments are set on the inner side of the grouting layer 2. The lining segments form a support structure inside the artificial chamber and serve as the base structure for the subsequent construction of polymer sealing material 4. The lining segments include multiple tenon-and-mortise steel pipe segments 3. Multiple tenon-and-mortise steel pipe segments 3 are assembled along the circumferential and longitudinal directions, so that the tenon-and-mortise steel pipe segments 3 in the same ring and between adjacent rings form a continuous lining segment. The inner surface of the lining segment is provided with polymer sealing material 4. The polymer sealing material 4 continuously covers the inner surface of the lining segment, and focuses on covering the tenon-and-mortise joints between the steel pipe segments to improve the sealing performance of the artificial chamber storage.

[0032] The polymer sealing material 4 is an elastic polyurea or epoxy resin-based composite material. After curing on site, the elastic polyurea or epoxy resin-based composite material forms a continuous flexible sealing inner wall, which is used together with the tenon and mortise steel pipe segments 3 for sealing the artificial chamber storage. The thickness of the polymer sealing material 4 is 3 to 8 mm. By controlling the thickness of the polymer sealing material 4 to 3 to 8 mm, it can cover the inner surface of the lining pipe segments and the tenon and mortise joints between the steel pipe segments, and meet the construction requirements for forming a continuous sealing inner wall.

[0033] Please see the appendix Figure 1 and attached Figure 2 Each ring of lining segments includes one capping block, two adjacent blocks, and four standard blocks. The capping block, adjacent blocks, and standard blocks are all tenon-and-mortise steel segments 3, allowing each ring of lining segments to be assembled from seven tenon-and-mortise steel segments 3. The ring width of the lining segments is 1.8m, determined based on the geological conditions and surrounding rock grade of the artificial cavern storage, to meet the support resistance requirements of the tenon-and-mortise steel segments 3. The tenon-and-mortise steel segments 3 are all-steel structures welded from high-strength steel plates. It can serve as a support component for lining segments and utilizes the steel plate structure itself to improve the airtightness of the lining segments. The inner surface of the tenon-and-mortise steel segment 3 is a continuous smooth steel plate surface, which facilitates sandblasting and rust removal, as well as the application or spraying of polymer sealing material 4. The tenon-and-mortise steel segment 3 does not have grouting holes, anchor holes, or bolt holes that penetrate through the wall thickness of the tenon-and-mortise steel segment 3. By not setting such through holes, it is possible to avoid the formation of potential leakage points under the high-pressure operation conditions of the artificial chamber storage tank. The grout channel required for backfill grouting is provided by the grouting pipe 6 at the TBM tail 7. The grout enters the annular gap between the outer wall of the tenon-and-mortise steel segment 3 and the surrounding rock 1 through the grouting pipe 6. Figure 2 As shown, K is the capping block, B1 and B2 are adjacent blocks, and A1 to A4 are four standard blocks.

[0034] Please see the appendix Figure 3 The circumferential steel pipe segment 3 is provided with a circumferential tenon 31 and a circumferential mortise 32 at both ends. Adjacent circumferential steel pipe segments 3 in the same ring are connected by the circumferential tenon 31 and the circumferential mortise 32 to complete the circumferential assembly of the lining segments in the same ring. Both the circumferential tenon 31 and the circumferential mortise 32 are designed as dovetail structures. The dovetail structure is used to achieve self-locking and pull-out resistance after the circumferential tenon 31 and the circumferential mortise 32 are engaged. The inclination angles of the two inclined surfaces of the circumferential tenon 31 and the two inclined surfaces of the circumferential mortise 32 are 15° to 30°. By limiting the inclination angle to 15° to 30°, the circumferential tenon 31 and the circumferential mortise 32 can form a stable engagement relationship during assembly. The fit gap between the circumferential tenon 31 and the circumferential mortise 32 is not greater than 0.5mm. By controlling the fit gap, the assembly accuracy of adjacent circumferential steel pipe segments 3 in the same ring can be improved.

[0035] A polymer sealing layer 35 is provided on the connection surface of the circumferential tenon 31 and the circumferential mortise 32. The polymer sealing layer 35 is used to form an initial seal after the circumferential tenon 31 and the circumferential mortise 32 are engaged. The polymer sealing layer 35 is a pre-vulcanized butyl rubber layer or a EPDM rubber layer. The pre-vulcanized butyl rubber layer or EPDM rubber layer can fit the connection surface of the circumferential tenon 31 and the circumferential mortise 32, thereby improving the sealing reliability of the tenon and mortise joint. The thickness of the polymer sealing layer 35 is 2 to 5 mm. By controlling the thickness of the polymer sealing layer 35 to 2 to 5 mm, an initial seal can be formed after the tenon and mortise are engaged, without affecting the assembly of the circumferential tenon 31 and the circumferential mortise 32.

[0036] Please see the appendix Figure 3 and attached Figure 4 The longitudinal ends of the tenon-and-mortise steel pipe segment 3 are respectively provided with longitudinal tenons 33 and longitudinal mortises 34. The lining segments of adjacent rings are connected by longitudinal tenons 33 and longitudinal mortises 34 to complete the longitudinal assembly between adjacent ring lining segments. Both the longitudinal tenons 33 and longitudinal mortises 34 are set as trapezoidal structures. The trapezoidal structure is used to bear the longitudinal thrust generated during open-face TBM tunneling. The trapezoidal height of the longitudinal tenons 33 and longitudinal mortises 34 is 1 / 4 to 1 / 3 of the thickness of the tenon-and-mortise steel pipe segment 3. By limiting the trapezoidal height, the longitudinal tenons 33 and longitudinal mortises 34 can transfer the longitudinal thrust between adjacent ring lining segments. The thrust is such that the fit gap between the longitudinal tenon 33 and the longitudinal mortise 34 is no greater than 0.5 mm. By controlling the fit gap, the assembly accuracy between adjacent ring lining segments can be improved. A polymer sealing layer 35 is provided on the connection surface between the longitudinal tenon 33 and the longitudinal mortise 34. The polymer sealing layer 35 is used to form an initial seal after the longitudinal tenon 33 and the longitudinal mortise 34 are engaged. The polymer sealing layer 35 is a pre-vulcanized butyl rubber layer or a EPDM rubber layer. The pre-vulcanized butyl rubber layer or the EPDM rubber layer can fit the connection surface between the longitudinal tenon 33 and the longitudinal mortise 34, thereby improving the sealing reliability between adjacent ring lining segments.

Claims

1. A construction method for a tenon-and-mortise steel segment lining structure of an artificial chamber storage silo, characterized in that, Includes the following steps: The open-type TBM was modified by adding a segment assembly machine, a tail brush (5) and a grouting pipe (6) to the tail of the TBM (7). The open-type TBM was used to excavate the artificial chamber; After each ring is excavated, the segment assembly machine sequentially grabs the tenon-and-mortise steel segments (3) and assembles the lining segments, so that adjacent tenon-and-mortise steel segments (3) in the same ring are connected by circumferential tenons (31) and circumferential mortises (32), and the lining segments of adjacent rings are connected by longitudinal tenons (33) and longitudinal mortises (34). Before the tenon-and-mortise steel pipe segment (3) is removed from the shield tail sealing system, grout is injected into the annular gap between the outer wall of the tenon-and-mortise steel pipe segment (3) and the surrounding rock (1) through the grouting pipe (6) to form a back wall grouting layer (2). After all the tenon-and-mortise steel pipe segments (3) are assembled and the wall grouting is completed, a polymer sealing material (4) is applied to the inner surface of the lining pipe segments.

2. The construction method of the mortise and tenon steel segment lining structure for an artificial chamber storage facility according to claim 1, characterized in that, The shield tail brush (5) consists of at least three layers. The shield tail brush (5) adopts a combination structure of stainless steel wire and steel plate, and a sealed chamber is formed between each layer of the shield tail brush (5). There are at least four grouting pipes (6), which are evenly distributed around the circumference of the TBM tail (7). The outlet of the grouting pipe (6) is located behind the tail brush (5), and the front end of the grouting pipe (6) is connected to the grouting pump.

3. The construction method of the mortise and tenon steel segment lining structure for an artificial chamber storage silo according to claim 1, characterized in that, The tenon-and-mortise steel pipe segments (3) are assembled in the order of bottom, then sides, and then top. The grout is a high-strength, micro-expansion cement-based grout, and the grouting pressure is controlled between 0.5 and 2.0 MPa. Before applying the polymer sealing material (4), the inner surface of the lining pipe segment is sandblasted to remove rust, and the cleanliness reaches Sa2.5 level.

4. A tenon-and-mortise steel pipe lining structure for an artificial chamber storage silo, characterized in that, A construction method for a tenon-and-mortise steel segment lining structure for an artificial chamber storage facility according to any one of claims 1-3, comprising surrounding rock (1), a backfill grouting layer (2) provided on the inner side of the surrounding rock (1), lining segments provided on the inner side of the backfill grouting layer (2), the lining segments comprising a plurality of tenon-and-mortise steel segments (3), and a polymer sealing material (4) provided on the inner surface of the lining segments. The circumferential ends of the tenon-and-mortise steel pipe segment (3) are respectively provided with circumferential tenons (31) and circumferential mortises (32). Adjacent tenon-and-mortise steel pipe segments (3) in the same ring are connected by the circumferential tenons (31) and the circumferential mortises (32). The longitudinal ends of the tenon-and-mortise steel pipe segment (3) are respectively provided with longitudinal tenons (33) and longitudinal mortises (34), and the lining pipe segments of adjacent rings are connected by the longitudinal tenons (33) and the longitudinal mortises (34). The connecting surfaces of the circumferential tenon (31) and the circumferential mortise (32) are provided with a polymer sealing layer (35), and the connecting surfaces of the longitudinal tenon (33) and the longitudinal mortise (34) are provided with the polymer sealing layer (35). The tenon-and-mortise steel pipe segment (3) does not have grouting holes, anchor holes or bolt holes that penetrate the wall thickness of the tenon-and-mortise steel pipe segment (3).

5. The mortise and tenon steel pipe lining structure for an artificial chamber storage facility according to claim 4, characterized in that, The tenon-and-mortise steel pipe segment (3) is an all-steel structure welded from high-strength steel plates, and the inner surface of the tenon-and-mortise steel pipe segment (3) is a continuous smooth steel plate surface.

6. The mortise and tenon steel pipe lining structure for an artificial chamber storage facility according to claim 4, characterized in that, Both the circumferential tenon (31) and the circumferential mortise (32) are configured as dovetail structures. The inclination angles of the two sides of the circumferential tenon (31) and the two sides of the circumferential mortise (32) are 15° to 30°. The fit gap between the circumferential tenon (31) and the circumferential mortise (32) is no greater than 0.5 mm.

7. The mortise and tenon steel pipe lining structure for an artificial chamber storage facility according to claim 4, characterized in that, Both the longitudinal tenon (33) and the longitudinal mortise (34) are set as trapezoidal structures. The trapezoidal height of the longitudinal tenon (33) and the longitudinal mortise (34) is 1 / 4 to 1 / 3 of the thickness of the mortise and tenon steel pipe (3). The fitting gap between the longitudinal tenon (33) and the longitudinal mortise (34) is no more than 0.5 mm.

8. The mortise and tenon steel pipe lining structure for an artificial chamber storage facility according to claim 4, characterized in that, The polymer sealing layer (35) is a pre-vulcanized butyl rubber layer or a EPDM rubber layer. The thickness of the polymer sealing layer (35) is 2-5 mm. The polymer sealing layer (35) is used to form an initial seal after the tenon and mortise are engaged.

9. The mortise and tenon steel pipe lining structure for an artificial chamber storage facility according to claim 4, characterized in that, The polymer sealing material (4) is an elastic polyurea or epoxy resin-based composite material. The thickness of the polymer sealing material (4) is 3-8 mm. The polymer sealing material (4) continuously covers the inner surface of the lining pipe segment and the tenon and mortise joint between the steel pipe segments.

10. The mortise and tenon steel pipe lining structure for an artificial chamber storage facility according to claim 4, characterized in that, Each ring of the lining segment includes one capping block, two adjacent blocks and four standard blocks, wherein the capping block, the adjacent blocks and the standard blocks are all tenon-and-mortise steel segments (3).

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