Ultra-high performance concrete duct piece system for construction of tunnel door opening and front ring special part and disassembly and assembly method of ultra-high performance concrete duct piece system

Abstract

The invention discloses an ultra-high performance concrete duct piece system for construction of special parts of a tunnel door opening and a front ring and a dismounting and mounting method of the ultra-high performance concrete duct piece system. The ultra-high performance concrete duct piece system comprises a ring formed by splicing a plurality of UHPC duct piece units through seams, a door opening construction through opening formed by splicing corner notches of four adjacent special duct pieces, and a steel module filling and supporting the door opening construction through opening. A steel layer structure covers the outer side of the specially-made pipe piece, and a sealing structure is arranged at the joint of the specially-made pipe piece and the steel layer structure; the steel module is composed of a plurality of steel units and is further provided with a water-encountering self-sealing filling material and other structures, and the disassembly and assembly method of the pipe piece system is provided. The technical effects that door opening construction is convenient, the sealing and waterproof performance is good, and repeated disassembly and assembly for use can be achieved are achieved.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of tunnel construction, in particular to an ultra-high performance concrete segment system for tunnel portal and normal ring special part construction and a dismounting method thereof. BACKGROUND

[0002] The special parts in tunnel engineering (such as connecting passage portal, complex geological area, high salt corrosion environment, cross-river and sea section, etc.) are key nodes affecting the overall engineering safety and durability. These parts usually face multiple challenges such as stress concentration, environmental corrosion, complex hydrogeology, etc., which put higher requirements on the strength, durability and construction efficiency of the supporting structure. Currently, the construction of such special parts mainly adopts two technical schemes of cast-in-place concrete structure or prefabricated assembly structure, among which the prefabricated assembly technology is increasingly widely used due to its fast construction speed and controllable quality. However, with the development of tunnel engineering towards deep, large section and high corrosion environment, the traditional concrete segment gradually exposes limitations such as brittleness, insufficient joint sealing and poor corrosion resistance. In recent years, ultra-high performance concrete (UHPC) has started to be applied in the field of shield tunnel segments due to its high compressive strength (up to more than 120 MPa), strong durability and dense structure, but its application in portal structures of special parts still has technical bottlenecks.

[0003] Currently, the construction of tunnel special parts (such as connecting passage portal) mainly adopts a modular segment scheme, which predefines detachable modules in the segment ring to improve the convenience of dismounting later, and to a greater extent, to improve construction efficiency and the degree of damage to the segment structure.

[0004] For the related technologies in the above, the applicant believes that there are the following defects: the detachable module often adopts a steel plate structure, while the segment is a concrete structure, and the joint between the dissimilar materials (steel and concrete) is prone to leakage problems due to the difference in thermal expansion coefficient, and the long-term maintenance cost is high, so there is still room for improvement. SUMMARY

[0005] In order to improve the waterproof effect of the joint of the segment structure, the present application provides an ultra-high performance concrete segment system for tunnel portal and normal ring special part construction and a dismounting method thereof.

[0006] The ultra-high performance concrete segment system for tunnel portal and normal ring special part construction and the dismounting method thereof provided by the present application adopt the following technical solutions: A high-performance concrete segment system for the construction of tunnel portals and special sections of the main ring includes: several segment units and steel modules. The segment units are UHPC segments. The segments are assembled with continuous joints. Four adjacent segment units at the portal construction location are special segments. Corner notches are reserved at the joints of the four special segments. The corner notches of the four special segments are assembled to form a portal construction opening. The steel modules are used to fill and support the portal construction opening. The four special segments are covered with a steel layer structure. A sealing structure is provided at the joint between the steel layer structure and the steel module at the portal opening location. The steel module and the steel layer structure are connected by detachable connecting components.

[0007] By adopting the above technical solution, the UHPC segments are assembled through joints to form a doorway for construction. The strain hardening characteristics of ultra-high strength concrete effectively suppress cracking. At the same time, the outer steel layer structure provides circumferential restraint. The steel layer structure covers the UHPC segments to form a composite load-bearing system, which reduces stress concentration at the opening. The detachable connection between the steel modules and the steel layer structure, which are made of the same steel material, improves the convenience of disassembly and assembly, and improves the problem of micro-cracks that are prone to occur at the joints of dissimilar materials due to the difference in thermal expansion coefficients. The sealing structure further ensures the water-proof capability of the joints.

[0008] Preferably, the steel module includes several steel units arranged in a rectangular shape, and each steel unit has an annular flange on its outer periphery. The annular flanges of adjacent steel units are directly fixed by locking bolts.

[0009] By adopting the above technical solution, the modular segmented design of the steel unit, connected by annular flanges and locking bolts, transforms single-point pressure bearing into overall stress bearing, thereby controlling the weight of individual steel units and facilitating manual hoisting within the tunnel. The uniformly distributed load of the annular flange reduces local compressive stress on the edges of the UHPC segments, and the bolted connection allows for rapid replacement without interrupting tunnel operations during maintenance.

[0010] Preferably, the sealing structure is a water-swellable sealing strip, which extends along the joint between the steel module and the construction opening; the connecting member includes a connecting screw, which passes through the annular flange of the steel unit and is threadedly connected to the steel layer structure.

[0011] By adopting the above technical solution, the water-swellable sealing strip expands by 200%–300% upon contact with seepage water, automatically filling the micro-gaps in the joints and forming the first line of defense for sealing. The threaded connection between the connecting screws and the steel layer structure provides mechanical locking force, preventing loosening caused by vibration. The combination of double sealing and rigid anchoring greatly reduces the leakage rate of the joints.

[0012] Preferably, the two inner walls of the corner notch of the specially designed segment are recessed to form material cavities. The material cavities extend along the joint between the steel module and the construction opening. The steel layer structure covers the inner wall of the material cavity, and the material cavity is filled with a water-reactive self-sealing filler material. The opening of the material cavity is covered with a thin film layer for sealing the opening. The annular flange of the steel unit has a through groove on the side near the corner notch. When the steel unit is in place at the construction opening, the through groove is aligned with the sealed material cavity. The connecting component also includes a steel insert. The steel insert passes through the through groove and punctures the thin film layer before being inserted into the material cavity. When water seepage occurs at the joint between the steel module and the construction opening, the water-reactive self-sealing filler material can absorb the seepage water and expand in volume to tightly fill and block the seepage path.

[0013] Because the seepage path at the joints is tortuous, traditional surface waterstops cannot cover all micro-cracks. By employing the above-mentioned technical solution, a material cavity is set inside the corner notch, filled with a water-reactive self-sealing filler, such as superabsorbent resin (particle size 0.1-0.5mm). After the steel insert punctures the membrane layer, a directional delivery channel for the resin to the seepage point is formed. When seepage occurs, the resin expands to a pressure of 0.3MPa, actively sealing the gap. Furthermore, the membrane layer seals the opening of the material cavity before segment transportation and assembly, preventing the water-reactive self-sealing filler from prematurely detaching or failing due to vibration and humidity. During assembly, the membrane is actively punctured by the steel insert to activate the material. Simultaneously, the interlocking of the steel insert and the material cavity improves the assembly accuracy of the steel unit at the construction opening.

[0014] Preferably, a sealing ring is provided on the inner peripheral wall of the through groove, and when the insert is inserted into the through groove, the inner wall of the sealing ring abuts against the outer peripheral side of the insert to seal it.

[0015] Since the gap between the insert and the through groove can easily become a secondary leakage path, by adopting the above technical solution, the sealing ring and the steel insert are interference-fitted (interference amount 0.2-0.5mm), maintaining contact stress after the insert is inserted and achieving a sealing effect.

[0016] Preferably, the water-reactive self-sealing filler material is superabsorbent resin powder particles.

[0017] By adopting the above technical solution, the superabsorbent resin powder particles have a large specific surface area (1000 m² / g level) and a fast expansion rate after contact with water (reaching a saturation expansion rate of 90% within 5 seconds). They can quickly block cracks up to 0.5 mm wide, and the expanded gel is elastic, which can adapt to the opening-closing cycle of the joint, and the subsequent disassembly and assembly of the edge can be completed.

[0018] Preferably, the outer periphery of the annular flange is provided with two vertically distributed annular mounting grooves, and a water-stop strip is provided in each of the two annular mounting grooves. When the steel unit is installed at the construction opening, the water-stop strip is squeezed by the steel layer structure at the construction opening and undergoes elastic deformation in the direction of the annular mounting groove, and presses against the steel layer structure at the construction opening, so as to form two seepage-proof layers between the outer side of the annular flange of the steel unit and the steel layer structure of the construction opening. The material cavity is located between the two water-stop strips.

[0019] By adopting the above technical solution, the two waterstop strips form a multi-layer anti-seepage system. The first waterstop strip bears the initial water pressure, and the second strip provides redundancy protection. The material cavity is located in the middle to form a "sealed chamber", which allows the self-sealing material to expand within a controllable range.

[0020] Preferably, the inner wall of the annular flange is detachably connected to an inner support frame, which supports the annular flange while also confining the steel insert within the through groove.

[0021] By adopting the above technical solution, the internal support frame provides radial support to the annular flange, suppressing flange warping under high water pressure, while simultaneously preventing the steel inserts from dislodging due to vibration by limiting their displacement. This dual constraint mechanism enhances the structural stability of the steel module.

[0022] A method for disassembling and assembling an ultra-high performance concrete segment system for the construction of tunnel portals and special sections of the main ring, comprising steps for installing steel modules and steps for disassembling steel modules; The steps for installing the steel module include: S1: Segment assembly and base preparation: Assemble several UHPC segment units into a ring through the joints, so that the corner notches of four adjacent special segments at the doorway construction position are assembled into a doorway construction opening; S2: Steel Unit Positioning and Initial Fixing: The steel units of the steel module are hoisted sequentially to the construction opening of the doorway, so that their annular flanges are attached to and initially aligned with the steel layer structure of the corner notch of the special pipe segment; the connecting screws are passed through the screw holes of the annular flanges and screwed into the threaded holes on the steel layer structure to achieve the initial fixing of the steel units. S3: Sealing structure and final fastening: Place the water-swellable sealing strip in the pre-set channel at the joint between the steel module and the construction opening; use locking bolts to fasten the annular flanges of adjacent steel units to form a whole steel module; S4. Activate the self-sealing mechanism: Align the steel insert with the groove on the annular flange, apply pressure to make the insert pierce the thin film layer at the opening of the material cavity and penetrate deep into the material cavity until the insert is tightly inserted into the bottom of the material cavity; a tight seal is formed between the sealing ring on the inner circumferential wall of the groove and the outer wall of the insert; finally, install the inner support frame on the inner side of the annular flange to provide inner support for the annular flange, while confining the steel insert within the groove; The steps for disassembling the steel module are the reverse of the installation steps, and include: T1. Release the built-in constraints: Remove the inner support frame inside the annular flange; T2. Pull out the insert: Carefully pull the steel insert out of the channel and the material cavity, and check the condition of the insert and the material cavity; T3. Separate the steel unit: Unscrew the connecting screws to release the locking bolt connection between the annular flanges of adjacent steel units; T4. Remove steel modules: Remove the steel units one by one from the construction opening of the doorway and perform maintenance or replacement.

[0023] In summary, this application includes at least one of the following beneficial technical effects: By using a detachable connection between two types of steel materials, namely steel modules and steel layer structures, the ease of assembly and disassembly is improved, while also addressing the issue of micro-cracks that can easily occur at the joints of dissimilar materials due to differences in thermal expansion coefficients. Furthermore, the sealing structure further ensures the water-proof capability of the joints. The double sealing of water-swellable waterproofing tape and water-sealable filling material, along with the rigid anchoring of connecting screws, steel inserts and internal support frame, greatly reduces the leakage rate of joints and improves the waterproofing effect at structural joints. The inner wall of the notch at the corner of the specially designed tube segment is equipped with a material cavity and filled with a water-reactive self-sealing filler material. When water seeps into the joint, the material absorbs the seepage water and expands in volume, tightly filling and blocking the seepage path. The thin film layer can prevent the material from failing prematurely. The steel insert punctures the film to activate the material and improve assembly accuracy. The installation method involves multiple steps, sequentially completing segment assembly, steel unit positioning and fixing, sealing structure setup, and self-sealing mechanism activation, achieving efficient installation of the steel modules. The disassembly method is the reverse of the installation steps, enabling rapid disassembly of the steel modules. Attached Figure Description

[0024] Figure 1 This is a cross-sectional view of an ultra-high performance concrete segment system used for the construction of tunnel portals and special parts of the main ring in Embodiment 1 of this application.

[0025] Figure 2 yes Figure 1 A cross-sectional view along the AA direction.

[0026] Figure 3 yes Figure 1 Enlarged diagram of point B in the middle.

[0027] Figure 4 This is a structural schematic diagram of an ultra-high performance concrete segment system for the construction of special parts of tunnel portals and positive rings, according to Embodiment 2 of this application.

[0028] Figure 5 This is a cross-sectional view of an ultra-high performance concrete segment system used for the construction of special parts of tunnel portals and positive rings, according to Embodiment 2 of this application.

[0029] Figure 6 yes Figure 5 Enlarged diagram of point C in the middle.

[0030] Figure 7 This is an exploded schematic diagram of the steel unit and steel insert of an ultra-high performance concrete segment system used for the construction of special parts of tunnel portals and positive rings, according to Embodiment 2 of this application.

[0031] Figure 8 This is an exploded schematic diagram of the internal support frame of an ultra-high performance concrete segment system used for the construction of special parts of tunnel portals and positive rings, according to Embodiment 2 of this application.

[0032] Explanation of reference numerals in the attached drawings: 1. Segment unit; 2. Special segment; 21. Material cavity; 3. Steel module; 31. Steel unit; 32. Annular flange; 321. Through groove; 322. Annular installation groove; 4. Construction opening; 41. Corner notch; 5. Steel layer structure; 6. Water-swellable sealing strip; 7. Steel insert; 8. Waterstop strip; 9. Sealing ring; 10. Internal support frame. Detailed Implementation

[0033] The following is in conjunction with the appendix Figures 1-8 This application will be described in further detail.

[0034] This application discloses an ultra-high performance concrete segment system for the construction of tunnel portals and special sections of the main ring road, referring to... Figures 1 to 3It includes several segment units 1, steel modules 3, steel layer structures 5, sealing structures and connecting components, and all steel materials are coated with anti-rust coating. In this structure, several segment units 1 are assembled through joints to form a tunnel structure. Four adjacent segment units 1 arranged in a rectangle at the portal construction location serve as special segment units 2. The special segment units 2 are made using a custom template with a notched corner structure to form corner notches 41 at the corners of the special segment units. At the same time, a steel layer structure 5 is wrapped around the outside of the special segment units 2. The steel layer structure 5 is a steel plate with multiple protruding structures on the inner side of the steel plate, which are embedded inside the special segment units 2 and cast together. When the four special segment units 2 are assembled in place at the portal construction area, their corner notches 41 form a portal construction opening 4. The steel module 3 fills the opening, and a sealing structure is set at the joint between the steel module 3 and the steel layer structure 5. Connecting components detachably connect the steel module 3 and the steel layer structure 5, thereby improving the waterproof effect at the structural joints while addressing the structural damage caused by openings and the inefficiency of construction. Because UHPC segments have ultra-high strength and high durability, they can effectively suppress cracking. The steel layer structure 5 provides circumferential restraint. Through the detachable connection between the steel module and the steel layer structure, which are made of the same steel material, the ease of disassembly and assembly is improved. At the same time, it improves the problem of micro-cracks that are prone to occur at the joints of dissimilar materials due to the difference in thermal expansion coefficients. In addition, the sealing structure further ensures the water-proof capability of the joints.

[0035] Specifically, segment unit 1 is a UHPC segment, which is made of ultra-high performance concrete. This material has characteristics such as ultra-high strength and high durability. Its shape is usually arc-shaped to adapt to the circular structure of the tunnel. Several segment units 1 are assembled through joints, which is simple and quick and can improve construction efficiency. Four adjacent segment units 1 located at the portal construction position are specially made segment 2. Corner notches 41 are reserved at the joint positions of the four specially made segment 2. The corner notches 41 are generally right trapezoidal or rectangular in shape. The corner notches 41 of the four specially made segment 2 are assembled to form the portal construction opening 4. The size and shape of the portal construction opening 4 are determined according to the design requirements of the connecting passage.

[0036] Specifically, the steel module 3 comprises several steel units 31 arranged in a rectangular shape. Each steel unit 31 is typically welded or cast from steel plates and is rectangular in shape. An annular flange 32 is provided around the outer periphery of each steel unit 31. The annular flange 32 can be integrally formed with the steel unit 31 or connected by welding or other methods. The function of the annular flange 32 is to facilitate the connection between steel units 31 and with the special-designed tubular segment 2. The annular flanges 32 of adjacent steel units 31 are directly fixed by locking bolts, which are typically high-strength bolts to ensure reliable connection. This modular design allows the steel module 3 to be assembled and disassembled as needed, facilitating construction and maintenance.

[0037] Specifically, the sealing structure is a water-swellable sealing strip 6, a rubber-based waterproofing material that expands upon contact with water. It extends along the joint between the steel module 3 and the construction opening 4, typically placed within a pre-designed channel at the joint. Upon contact with seepage water, the water-swellable sealing strip 6 expands by 200%-300%, automatically filling the micro-gaps in the joint and forming the first line of defense. Connecting components include connecting screws, which are generally made of stainless steel to prevent rust. These screws penetrate the annular flange 32 of the steel unit 31 and are threaded into the steel layer structure 5. This threaded connection provides mechanical locking force, preventing loosening due to vibration. Example

[0038] Reference Figures 4 to 6 The difference between this embodiment and Embodiment 1 is that each specially designed tube segment 2 has a material cavity 21 recessed on both inner walls of the corner notch 41. The material cavity 21 extends along the joint between the steel module 3 and the construction opening 4, and its shape is elongated. The steel layer structure 5 also covers the inner wall of the material cavity 21, which serves to protect the material cavity 21 and enhance the structural strength. The material cavity 21 is filled with a water-reactive self-sealing filler material, which is a superabsorbent resin powder particle. The superabsorbent resin powder particle has a large specific surface area (1000 m² / g level) and expands rapidly after contact with water (reaching a saturation expansion rate of 90% within 5 seconds), which can quickly block cracks up to 0.5 mm wide. Moreover, the expanded gel is elastic and can adapt to the opening-closing cycle of the joint. The opening of the material cavity 21 is covered with a thin film layer for sealing the opening. The film layer can be a plastic film or a rubber film. Its function is to seal the opening of the material cavity 21 before the segment is transported and assembled, preventing the water-reactive self-sealing filler material from falling off or failing prematurely due to vibration and humidity. The annular flange 32 of the steel unit 31 has a through groove 321 on the side near the corner notch 41. When the steel unit 31 is positioned at the construction opening 4, the through groove 321 is aligned with the sealed material cavity 21. The connecting components also include a steel insert 7, which is generally a long strip of steel with a sharp head to pierce the film layer. The steel insert 7 is inserted into the material cavity 21 after passing through the through groove 321 and piercing the film layer. When water seeps into the joint between the steel module 3 and the construction opening 4, the water-reactive self-sealing filler material absorbs the seepage water and expands in volume to tightly fill and block the seepage path. This further enhances the waterproofing capabilities at the joints of the tunnel lining structure.

[0039] Specifically, a sealing ring 9 is provided on the inner circumferential wall of the through groove 321. The sealing ring 9 is generally made of rubber, which has good elasticity and sealing performance. When the steel insert 7 is inserted into the through groove 321, the inner wall of the sealing ring 9 abuts against the outer circumference of the steel insert 7 to seal and prevent water from leaking from the through groove 321.

[0040] Reference Figure 7 and Figure 8 Specifically, the outer periphery of the annular flange 32 has two vertically distributed annular grooves 322, each containing a waterstop strip 8, which is typically made of rubber. When the steel unit 31 is installed at the construction opening 4, the waterstop strip 8 is compressed by the steel layer structure 5 at the construction opening 4 and undergoes elastic deformation towards the annular groove 322, pressing against the steel layer structure 5 at the construction opening 4. This forms two anti-seepage layers between the outer side of the annular flange 32 of the steel unit 31 and the steel layer structure 5 of the construction opening 4. The material cavity 21 is located between the two waterstop strips 8. This design forms a multi-layer anti-seepage system. The first waterstop strip 8 bears the initial water pressure, the second provides redundancy, and the material cavity 21 forms a "sealed chamber" within it, allowing the self-sealing material to expand within a controllable range.

[0041] Specifically, the inner wall of the annular flange 32 is detachably connected to an inner support frame 10. The inner support frame 10 is generally made of steel, and its shape can be designed according to the shape and size of the annular flange 32. While supporting the annular flange 32, the inner support frame 10 also confines the steel insert 7 within the through groove 321. The detachable connection between the inner support frame 10 and the annular flange 32 can be a bolt connection or a snap-fit ​​connection. This dual constraint mechanism improves the structural stability of the steel module 3. It should be emphasized that the inner support frame 10 is assembled from multiple inner support units, and the mating surfaces between adjacent inner support units have a certain tilt angle, which allows for smooth assembly and disassembly through a specific sequence. Similarly, the mating surfaces between the annular flanges 32 of adjacent steel units 31 also need to be set with a specific tilt angle to facilitate assembly into the construction opening 4 piece by piece.

[0042] The implementation principle of this embodiment is as follows: This segment system combines UHPC segments and steel modules 3, fully utilizing the high strength and durability of the UHPC segments and the detachability of the steel modules 3. The corner notch 41 design of the specially designed segment 2 avoids damage to the segment structure caused by traditional cutting and opening, reducing construction vibration and construction waste. The sealing structure and water-reactive self-sealing filling material effectively improve the waterproofing effect at the structural joints. The detachable connection method makes the installation and disassembly of the steel modules 3 convenient and quick, shortening the construction cycle and reducing maintenance costs. Simultaneously, the design of the internal support frame 10 and waterstop strip 8 further improves the system's stability and waterproofing performance, offering significant advantages compared to traditional connecting passageway doorway construction schemes, representing an improvement and innovation of existing technology.

[0043] The method for disassembling and assembling an ultra-high performance concrete segment system for the construction of tunnel portals and special parts of the main ring provided in this application includes a step for installing the steel module 3 and a step for disassembling the steel module 3.

[0044] S1, Segment Assembly and Base Preparation: Several UHPC segment units 1 are assembled into a ring through the joints, so that the corner notches 41 of four adjacent specially made segments 2 located at the doorway construction position are assembled to form the doorway construction opening 4. In this step, hoisting equipment is needed to lift the UHPC segment units 1 to the designated position for assembly. Construction personnel must ensure the splicing accuracy of the segment units 1 to ensure that the corner notches 41 can be accurately assembled to form the doorway construction opening 4.

[0045] S2, Positioning and Initial Fixing of Steel Unit 31: Each steel unit 31 of the steel module 3 is sequentially hoisted to the construction opening 4, ensuring its annular flange 32 is fitted and initially aligned with the steel layer structure 5 of the corner notch 41 of the special segment 2. This requires the use of hoisting equipment such as a crane to accurately lift the steel unit 31 to the construction opening 4. Then, connecting screws are passed through the screw holes of the annular flange 32 and screwed into the threaded holes on the steel layer structure 5, achieving initial fixation of the steel unit 31. Construction personnel must use appropriate tools, such as wrenches, to tighten the connecting screws to ensure reliable connection.

[0046] S3, Sealing Structure and Final Tightening: Place the water-swellable sealing strip 6 into the pre-set channel at the joint between the steel module 3 and the construction opening 4. The water-swellable sealing strip 6 should be placed flat to ensure it completely covers the joint. Use locking bolts to fasten the annular flange 32 of adjacent steel units 31 together, making the steel modules 3 a single unit. Construction personnel must tighten the locking bolts to the specified torque to ensure the integrity and stability of the steel modules 3.

[0047] S4, Activate the self-sealing mechanism: Align the steel insert 7 with and insert it into the through groove 321 on the annular flange 32. Apply pressure to pierce the thin film layer at the opening of the material cavity 21 and penetrate deep into the material cavity 21 until the insert is tightly inserted into the bottom of the material cavity 21. During this process, the construction personnel must use special tools to apply pressure to ensure that the insert can successfully pierce the thin film layer and insert into the material cavity 21. A tight seal is formed between the sealing ring 9 on the inner circumferential wall of the through groove 321 and the outer wall of the insert. The sealing ring 9 must be installed correctly to ensure the sealing effect. Finally, install the inner support frame 10 inside the annular flange 32 to provide inner support for the annular flange 32 and at the same time confine the steel insert 7 within the through groove 321. The installation of the inner support frame 10 must be firm to ensure that it can play a supporting and confining role.

[0048] The steps for disassembling steel module 3 are the reverse of the installation steps, and include: T1, Release the internal constraints: Disassemble the inner support frame 10 inside the annular flange 32. The construction personnel use appropriate tools, such as wrenches, to remove the connecting bolts of the inner support frame 10, and then remove the inner support frame 10 from the inside of the annular flange 32.

[0049] T2, Remove the insert: Carefully remove the steel insert 7 from the through groove 321 and the material cavity 21, and check the condition of the insert and the material cavity 21. When removing the insert, pay attention to the force and direction to avoid damaging the insert and the material cavity 21. Check the condition of the insert and the material cavity 21 for any damage or blockage, and address any issues promptly.

[0050] T3, Separate steel unit 31: Unscrew the connecting screws to release the locking bolt connection between the annular flange 32 of adjacent steel units 31. Workers use wrenches and other tools to unscrew the connecting screws and locking bolts, thus releasing the connection between the steel units 31.

[0051] T4, Remove steel module 3: Remove steel units 31 one by one from the doorway construction opening 4, and perform maintenance or replacement. Use hoisting equipment to lift the steel units 31 to the doorway construction opening 4, and inspect, maintain or replace any damaged parts.

[0052] This disassembly and assembly method strictly adheres to the structural characteristics and design requirements of the segment system. The installation steps, from segment assembly to the installation of steel module 3 and the setting of the sealing structure, and then to the activation of the self-sealing mechanism, are all closely linked, ensuring the correct installation and waterproof performance of the segment system. The disassembly step is the reverse of the installation steps, facilitating the maintenance and replacement of steel module 3.

[0053] The above are all preferred embodiments of this application, and are not intended to limit the scope of protection of this application. Therefore, all equivalent changes made in accordance with the structure, shape and principle of this application should be covered within the scope of protection of this application.

Claims

1. A high-performance concrete segment system for the construction of tunnel portals and special sections of the main ring, characterized in that: The system includes several pipe segment units (1) and steel modules (3). The pipe segment units (1) are UHPC pipe segments. Several pipe segment units (1) are assembled with through joints. Four adjacent pipe segment units (1) located at the doorway construction position are special pipe segments (2). Corner notches (41) are reserved at the joint positions of the four special pipe segments (2). The corner notches (41) of the four special pipe segments (2) are assembled to form a doorway construction opening (4). The steel modules (3) are used to fill the doorway construction opening (4). The four special pipe segments (2) are covered with a steel layer structure (5). A sealing structure is provided at the joint between the steel layer structure (5) and the steel module (3) at the construction opening (4). The steel module (3) and the steel layer structure (5) are connected by detachable connecting components.

2. The ultra-high performance concrete segment system for the construction of tunnel portals and special sections of the main ring as described in claim 1, characterized in that: The steel module (3) includes several steel units (31) arranged in a rectangular shape. The outer periphery of each steel unit (31) is provided with an annular flange (32), and the annular flanges (32) of adjacent steel units (31) are directly fixed by locking bolts.

3. The ultra-high performance concrete segment system for the construction of tunnel portals and special sections of the main ring as described in claim 2, characterized in that: The sealing structure is a water-swellable sealing strip (6), which extends along the joint of the steel module (3) and the construction opening (4); the connecting member includes a connecting screw, which passes through the annular flange (32) of the steel unit (31) and is threadedly connected to the steel layer structure.

4. The ultra-high performance concrete segment system for the construction of tunnel portals and special sections of the main ring as described in claim 2, characterized in that: The corner notch (41) of the special tube segment (2) has two recessed inner walls with material cavities (21). The material cavities (21) extend along the joint of the steel module (3) and the construction opening (4). The steel layer structure covers the inner wall of the material cavity (21). The material cavity (21) is filled with a water-reactive self-sealing filling material. The opening of the material cavity (21) is covered with a thin film layer for sealing the opening of the material cavity (21). The annular flange (32) of the steel unit (31) is open on the side near the corner notch (41). A through groove (321) is provided. When the steel unit (31) is in place at the construction opening (4), the through groove (321) is aligned with the closed material cavity (21). The connecting member also includes a steel insert (7). The steel insert (7) is inserted into the material cavity (21) after passing through the through groove (321) and piercing the film layer. When water seepage occurs at the joint between the steel module (3) and the construction opening (4), the water-reactive self-sealing filling material can absorb the seepage water and expand in volume to tightly fill and block the seepage path.

5. A high-performance concrete segment system for the construction of tunnel portals and special sections of the main ring, as described in claim 4, is characterized in that: A sealing ring (9) is provided on the inner peripheral wall of the through groove (321). When the steel insert (7) is inserted into the through groove (321), the inner wall of the sealing ring (9) and the outer peripheral side of the steel insert (7) are tightly sealed.

6. The ultra-high performance concrete segment system for the construction of tunnel portals and special sections of the main ring as described in claim 4, characterized in that: The water-reactive self-sealing filler material is a superabsorbent resin powder particle.

7. A high-performance concrete segment system for the construction of tunnel portals and special sections of the main ring, as described in claim 4, is characterized in that: Two annular mounting grooves (322) are provided on the outer periphery of the annular flange (32). Water-stop strips (8) are provided in both annular mounting grooves (322). When the steel unit (31) is installed at the construction opening (4), the water-stop strips (8) are squeezed by the steel layer structure (5) at the construction opening (4) and undergo elastic deformation in the direction of the annular mounting groove (322), and press against the steel layer structure (5) at the construction opening (4) to form two anti-seepage layers between the outer side of the annular flange (32) of the steel unit (31) and the steel layer structure (5) of the construction opening (4). The material cavity (21) is located between the two water-stop strips (8).

8. A high-performance concrete segment system for the construction of tunnel portals and special sections of the main ring, as described in claim 5, is characterized in that: The inner wall of the annular flange (32) is detachably connected to an inner support frame (10). The inner support frame (10) supports the annular flange (32) and also confines the steel insert (7) within the through groove (321).

9. A method for disassembling and assembling an ultra-high performance concrete segment system for the construction of tunnel portals and special sections of the main ring as described in claim 8, characterized in that: It includes steps for installing the steel module (3) and steps for removing the steel module (3); The steps for installing the steel module (3) include: S1: Segment assembly and base preparation: Several UHPC segment units (1) are assembled into a ring through the seam, so that the corner gaps (41) of four adjacent special segments (2) located at the doorway construction position are assembled into a doorway construction opening (4); S2: Positioning and initial fixing of steel unit (31): The steel units (31) of the steel module (3) are hoisted to the construction opening (4) of the doorway in sequence, so that the annular flange (32) is attached to the steel layer structure (5) of the corner notch (41) of the special pipe segment (2) and initially aligned; the connecting screws are passed through the screw holes of the annular flange (32) and screwed into the threaded holes on the steel layer structure (5) to achieve the initial fixing of the steel unit (31); S3: Sealing structure and final fastening: Place the water-swellable sealing strip (6) in the pre-set channel at the joint between the steel module (3) and the construction opening (4); use locking bolts to fasten the annular flange (32) of the adjacent steel unit (31) to form a whole; S4: Activate the self-sealing mechanism: Align the steel insert (7) with and insert it into the through groove (321) on the annular flange (32), apply pressure to make the insert pierce the film layer at the opening of the material cavity (21) and extend into the inside of the material cavity (21) until the steel insert (7) is tightly inserted into the bottom of the material cavity (21); a tight seal is formed between the sealing ring (9) on the inner circumferential wall of the through groove (321) and the outer wall of the steel insert (7); finally, install the inner support frame (10) on the inner side of the annular flange (32) to provide inner support for the annular flange (32) and at the same time restrict the steel insert (7) in the through groove (321); The steps for disassembling the steel module (3) are the reverse of the installation steps, and include: T1: Release the built-in constraints: Remove the inner support frame (10) inside the annular flange (32); T2: Pull out the insert: Pull the steel insert (7) out of the through groove (321) and the material cavity (21); T3: Separate steel unit (31): Unscrew the connecting screws to release the locking bolt connection between the annular flange (32) of the adjacent steel unit (31); T4: Remove steel modules (3): Remove the steel units (31) one by one from the construction opening (4) of the doorway.

Images