A through-hole tensioned pipe segment, pipe segment pre-tensioning auxiliary tooling and use method

Abstract

The present invention discloses a through-the-core tensioned segment, segment pre-tensioning auxiliary tooling, and a method of use, including: a through-the-core tensioned shield lining segment, symmetrically arranged pre-embedded post-tensioned steel strand threading pipes between the segment force-transmitting concave and convex platforms or other positions, a pre-embedded anchor cable mechanism on the side of the rear shield propulsion jack; a pre-embedded integrated anchor ring on the side of the front shield propulsion jack; perforation of the post-tensioned steel strands during shield assembly; a detachable full-circle tool ring and a detachable prestressing ring; a half-moon-shaped reaction support beam and a jacking system; rounding the elliptical position of the segment before prestressing, supporting the easily deformed or eccentrically loaded parts of the segment; the half-moon-shaped reaction support beam prestressing mechanism is a jacking system preset in the half-moon-shaped structure. The present invention solves the problem of a shield machine having no resistance or insufficient resistance at the front end of the cutterhead, resulting in failure of the segment waterproofing and elliptical deformation of the lining after insufficient assembly force of the shield segment.

Description

Technical Field

[0001] The present invention relates to the technical field of shield tunnel construction, and more particularly to a through-hole tensioned segment, a segment pre-tensioning auxiliary tooling, and a method of use. Background Art

[0002] With the development of urbanization, road and railway networks require wider extension and interconnection. Highway and railway tunnels are being developed through mountains and seas, with larger diameters, longer distances, and greater depths, traversing various complex strata. Under existing shield tunneling technology, various shield expansions—conventional cutterhead shields, atmospheric pressure cutterhead shields, conventional cutterhead slurry shields, and dual-mode TBMs—are unable to complete excavation in extremely hard rock sections within the contracted construction period. Adding shafts and increasing the number of shield machines, as well as employing mining methods for extremely hard rock sections, have become important solutions to address construction deadlines. However, when pushing lining segments through a tunnel, the lack of or insufficient reaction force at the front end presents a pressing challenge: how to compress the segments and effectively deform the inter-ring waterproofing material to achieve its waterproofing function.

[0003] Similarly, when the shield machine enters the receiving well during tunnel penetration, the receiving segment is prone to loosening when there is no or little constraint at the front end, and the waterproofing between the segment rings is not effectively squeezed and deformed to form a good water-stopping function, which also creates leakage risks and disposal costs for the subsequent operation and maintenance of highway tunnels or railway tunnels. Conventional inner arc surface embedded steel plate tensioning cannot effectively solve this type of problem.

[0004] In the above problems, the shield will cause the segments to relax and deform due to the lack of reaction force or insufficient reaction force at the front end. The waterproof material between the segment rings cannot be effectively compressed and deformed, resulting in the inability to form a waterproof function. When a permeable channel appears, it will cause continuous leakage in the tunnel, insufficient durability or even damage to the tunnel, posing a huge risk to the safety of tunnel operations. Summary of the Invention

[0005] The purpose of the present invention is to provide a through-hole tensioned pipe segment, a pipe segment pre-tensioning auxiliary tooling and a method of use, so as to solve the problem that the shield machine has no resistance or insufficient resistance at the front end of the cutter head, resulting in insufficient assembly force of the shield pipe segment, failure of the pipe segment waterproofing, and elliptical and out-of-round deformation of the lining.

[0006] The technical solution adopted by the present invention to solve this technical problem is: a through-core tensioned pipe segment and a pipe segment pre-tensioning auxiliary tooling, comprising:

[0007] For through-the-core tensioned shield lining segments, pre-embedded post-tensioning steel strands are symmetrically placed between the segment's force-transmitting concave and convex platforms or other locations. Anchor cable mechanisms are embedded on the back side of the shield propulsion jacks in rings 1, 4, 9, and 5N-1. Integrated anchor rings are embedded on the front side of the shield propulsion jacks in rings 5, 10, 15, and 5N. During shield assembly, post-tensioning steel strands are perforated and tightened as a unit of five rings.

[0008] A detachable full-circle tool ring and a detachable prestressing ring;

[0009] A half-moon-shaped reaction support beam and jacking system; the width of the half-moon-shaped reaction support beam equals the width of the full-circle tool ring plus the width of the prestressing ring. This rounds off the elliptical position of the segment before prestressing, supporting areas prone to deformation or those subject to eccentric loading. The half-moon-shaped reaction support beam prestressing mechanism is a jacking system pre-set within the half-moon-shaped structure, comprising a hydraulic cylinder assembly.

[0010] The through-type prestressed mechanism includes a through-type tensioning jack, a hydraulic oil pipe, an automatic control system and a hydraulic station.

[0011] As a further solution of the present invention, it also includes an external working platform, which provides a working surface by connecting with the working platform of the segment assembly machine.

[0012] As a further solution of the present invention, a groove pre-embedded anchor cable mechanism is set on the side of the 1-ring, 4-ring, 9-ring...5N-1 ring back shield propulsion jack, and the groove depth meets the reserved length for passing the steel strand.

[0013] As a further solution of the present invention, the detachable full-circle tool ring is composed of a detachable circular steel box beam, wherein a space is provided inside the box beam for accommodating a hydraulic jacking cylinder;

[0014] The width of the full-circle tool ring is the same as that of the lining segment. The ring steel box girder blocks are connected with oblique bolts. The ring steel box girder and the prestressing ring are limited by oblique bolts and quick clips, and are quickly assembled and disassembled using a segment assembly machine.

[0015] As a further solution of the present invention, the prestressing ring adopts a steel structure, the thickness of the prestressing ring = the thickness of the lining segment + the thickness of the full-circle tool ring, and a through-core tensioning jack is arranged inside the prestressing ring to tension and tighten a group of lining steel strands passing through 5 rings.

[0016] As a further solution of the present invention, the semi-lunar reaction support beam adopts a semi-lunar steel box beam structure, and is assembled and limited according to the position where the lining segment roundness exceeds the limit, the position where the segment is overloaded, or the position where the segment's own gravity elliptical deformation is concentrated; a reaction reinforcement cavity is set in the semi-lunar steel box beam.

[0017] As a further solution of the present invention, the through-type prestressing mechanism is attached to a detachable prestressing ring, connected to the hydraulic station through a hydraulic oil pipe bundle, and balanced tensioning of the entire ring of pipe segments is performed through an automatic control system.

[0018] The present invention also provides a method for using a through-core tensioned segment and a segment pre-tensioning auxiliary tooling, comprising the following steps:

[0019] 1) Before prefabricating the segments, anchor pads are embedded inside the segments and inserted into the pipes. A groove is provided on the outer side of the force transmission section of the back jack section to reserve space for the initial anchorage of the segments, the clips, and the exposed length of the steel strands during the subsequent tensioning. An integrated anchor ring is embedded on the side of the shield thrust jack facing the final ring of the through-tensioning segment to place the anchor at the reserved working position of the prestressing ring. The steel strands in the segments are grooved and assembled in a staggered manner to achieve continuous seams after the segments are assembled at different points.

[0020] 2) The tunnel shield advances forward or reaches the excavation stage, assembling the initial ring N for lining tensioning. Before assembling the initial ring, install the fixed end embedded anchor cable mechanism in the reserved groove at the lower side of the jack on the back of the segment and insert the steel strand. Lock the anchor position, arrange the reserved steel strand to ensure it is in the reserved hole, and throw out the remaining steel strands of the tensioning unit from the reserved hole between the shield jack shoes, straighten and arrange them;

[0021] 3) The shield machine advances forward using the assembled lining or receives the tunneling, assembling the lining tensioning segments with staggered or continuous seams, and inserting the tensioning steel strand until the N+3 ring needs to be inserted through the lower hole steel strand, and the upper hole is used as the starting point steel strand and the tensioning fixed end is locked;

[0022] 4) As the shield advances or the shield receives and excavates to the N+4 ring, the lower steel strand is inserted into the anchor embedded parts and then arranged. The lower steel strand continues to be pierced and the prestressing ring is assembled at this time;

[0023] 5) After the steel strand passes through the reserved working groove of the prestressing ring, push the cylinder to support the prestressing ring. At this time, install the full-circle tool ring. If the roundness of the unconstrained ring segment exceeds the limit, install a half-moon reaction support beam at the position where the deformation exceeds the limit or the stress concentration point, and use the built-in cylinder of the full-circle tool ring to perform fine adjustment and limit.

[0024] 6) Connect the through-tensioning jack built into the prestressing ring, use the automatic control system to coordinate tensioning and locking of the entire ring lining, and grouting after tensioning is completed.

[0025] 7) Remove the half-moon reaction support beam, full-circle tool ring and prestressing ring, continue to step forward or receive excavation, and repeat the above steps 3)-6) until the shield stepping or receiving is completed.

[0026] The present invention has at least the following beneficial effects:

[0027] 1. The propulsion force provided by the shield propulsion system is not used as the assembly force for compacting the segments, solving the problem of insufficient assembly force between the lining rings around the cutter head and shield body due to lack of constraints and resistance.

[0028] 2. Solve the problem of loose segments during shield tunnel construction. Convert the traditional loose inner arc surface welding limiter of the segments into a segment through-the-core tensioning and extrusion limiter to achieve an inter-ring waterproof mechanism.

[0029] 3. Effectively solve the shield tunneling problem of encountering full-section or large-section hard rock in single-headed, long-distance and variable strata. After the conversion of the dark tunnel construction method, the full-ring lining empty splicing and tensioning and compaction are used to assist the step-by-step process to improve the tunnel construction efficiency, maintain the health of the shield machine and extend its service life. The effective combination of construction methods expands the breadth of shield machine construction and the constraints of shield selection.

[0030] 4. Utilize the existing assembly structure system of the shield machine to achieve rapid assembly and disassembly of the tool ring, and automatically use the through-hole tensioning to solve the technical pain points of loose segments, out-of-roundness and insufficient assembly force.

[0031] 5. The automatic control platform can automatically solve the problem of the out-of-position lifting and limiting of the segment full circle tool ring, and synchronously through-the-core tensioning of the segment to achieve its assembly force, which is safe and efficient.

[0032] 6. The attached external working platform can be temporarily fixed or hung externally using the assembly machine, cylinder grippers and segment assembly work platform. At the same time, the working platform can be extended outward to limit the position, thus achieving rapid and full coverage of the aerial work platform for operators.

[0033] Other advantages, objectives and features of the present invention will be reflected in part from the following description and will be understood by those skilled in the art through study and practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 This is an elevation view of a through-core tensioned shield lining segment of the present invention;

[0035] Figure 2 It is a side plan view of the jack of the through-core tension shield lining segment of the present invention;

[0036] Figure 3 It is a side plan view of the back jack of the through-core tension shield lining segment of the present invention;

[0037] Figure 4 is a schematic diagram of a full-circle tool ring of the present invention;

[0038] Figure 5 yes Figure 4 A large-scale drawing of the block connection of the full-circle tool ring;

[0039] Figure 6 yes Figure 4 Sectional drawing of medium AA circular steel box girder;

[0040] Figure 7 This is the main view of the position relationship between the prestressed tool ring, the full circle tool ring, the pipe segment and the half-moon steel box girder;

[0041] Figure 8 This is a side view of the positional relationship of the prestressed tool ring, the full-circle tool ring, the segment, and the half-moon steel box girder;

[0042] Figure 9 This is the main view of the entire circle of the formed lining segment and the pre-tensioned tightening;

[0043] Figure 10 This is the side view of the full circle of the formed lining segment and the pre-tensioned tightening;

[0044] Figure 11 It is a three-dimensional schematic diagram of the pre-buried segment channel;

[0045] Figure 12 This is a schematic diagram of the initial ring of assembled anchorage tensioning;

[0046] Figure 13 It is assembled by stepping or receiving the tunneling segments with annular lining, and the steel strand is perforated;

[0047] Figure 14 It is a schematic diagram of assembling two prestressed tensioning steel rings and threading steel strands;

[0048] Figure 15 It is to install the full circle tool ring and the half-moon reaction support beam to make a full circle diagram;

[0049] Figure 16 It is a schematic diagram of coordinated tensioning and anchoring of the full ring lining using an automatic control system.

[0050] Among them, 1-embedded anchor cable mechanism installed in the back jack surface segment (1#, 4#, 9#, 14# rings...5N-1 ring); 2-embedded anchor ring in the segment; 3-embedded channel; 4-embedded integrated anchor ring in the front jack surface segment; 5-through tensioning jack; 6-anchor clamp; 7-prestressing ring; 8-segment line of the full circle tool ring; 9-segment connection of the full circle tool ring; 10-bolt connection of the full circle tool ring; 11-full circle tool ring; 12-semi-lunar reaction support beam; 13-hydraulic jacking cylinder; 14-lining ring segment; 15-steel strand; 16-hydraulic oil pipe; 17-hydraulic station; 18-shield lining segment, 19-bolt hole, 20-stiffener plate, 21-bolt connection plate. DETAILED DESCRIPTION

[0051] The present invention is described in detail and completely below with reference to the accompanying drawings. Those skilled in the art will be able to implement the present invention based on this description. Before describing the present invention with reference to the accompanying drawings, it should be noted that the technical solutions and technical features provided in various parts of the present invention, including those described below, may be combined with each other unless they conflict.

[0052] In addition, the embodiments of the present invention described below are generally only part of the embodiments of the present invention, rather than all of the embodiments. Therefore, based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making any creative efforts should fall within the scope of protection of the present invention.

[0053] Aiming at the technical difficulties in the existing shield tunneling through dark excavated tunnels using lining ring stepping or shield tunneling method tunnel construction receiving section lining assembly, such as the easy convergence and elliptical deformation of the segments and the inability to effectively deform and compact the waterproof sealing gaskets between the segment rings to form a water stop due to insufficient assembly force, the present invention aims to provide a through-core tensioned shield lining segment, segment assembly pre-tensioning auxiliary tooling, and a construction method for pre-tensioning and tightening the formed lining segments. The risks caused by insufficient assembly force between segments are addressed from three dimensions: prefabrication of through-core prestressed segments, design of shield assembly pre-stressed auxiliary tensioning tooling, and through-core tensioning and tightening method for formed lining segments, and a series of segment loosening problems caused by insufficient reaction force at the front end of the shield machine are systematically solved. The present invention does not require any changes to the segment prefabrication mold, and both the tooling and through-core prestressing application method utilize the shield machine's own equipment to assist, with a high degree of automation and safety control throughout the process. This tooling can be reused repeatedly, and can also be quickly disassembled, converted, or even modified. It has high turnover and utilization rates, and there are no discarded parts. It can be used in all working conditions where the front end resistance of the shield is insufficient and the shield machine cannot provide effective segment assembly force, resulting in weakened or ineffective lining waterproofing. It has high practicality and wide applicability.

[0054] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments. The specific implementation process is as follows:

[0055] like Figures 1 to 10 As shown, the present invention provides a through-core tensioned pipe segment and a pipe segment pre-tensioning auxiliary tooling, comprising:

[0056] The through-hole tensioned shield lining segments are made of ordinary segments with pre-embedded channels 3 according to the prestressing requirements, and are also pre-embedded with devices for strengthening, fixing the anchoring end, and the tensioning end. After tensioning, grouting is performed in the channels. Specifically, two pre-embedded post-tensioning steel strands are symmetrically set between the segment force-transmitting bosses or other positions (other positions refer to some types of segments that do not have force-transmitting bosses, and the pipes can be inserted at positions where the segments avoid the main reinforcement) to form pre-embedded channels. When the segments are prefabricated, the post-tensioning steel strands are pre-embedded in the center according to the position of the segment force-transmitting mechanism. Anchor rings 2 and anchor cable mechanisms 1 are pre-embedded on the 1st, 4th, 9th, and 5N-1 ring back shield propulsion jack sides of the segments; integrated anchor rings 4 are pre-embedded on the 5th, 10th, 15th, and 5N ring front shield propulsion jack sides for prestressing ring tensioning. During the shield assembly process, the post-tensioning steel strands are perforated and tightened as a unit of 5 rings.

[0057] The detachable full-circle tool ring 11 and the detachable prestressing ring 7; Figure 9 As shown, the block connection 9 of the full circle tool ring is the same as the segment block, which can be installed using a segment assembly machine without adding other auxiliary equipment; the full circle tool ring can also be bolted 10, which can achieve rapid assembly and disassembly and facilitate reuse. The full circle tool ring is bolted to the prestressing ring, and the blocks of the full circle tool ring are bolted together by setting a bolt connection plate 21 and bolt holes 19. The bolt connection plate is provided with a stiffening plate 20. Figure 4 As shown, the segmentation line 8 of the full-circle tool ring is the same as the segmentation line of the through-core tension shield lining segment 18.

[0058] A half-moon-shaped reaction support beam 12 and a jacking system; to ensure that the formed five-ring segment is effectively tensioned by utilizing the consolidation cohesion and friction between the formed tunnel and the stratum, the width of the half-moon-shaped reaction support beam is equal to the full-circle tool ring width + the prestressing ring width. Its flexible installation position allows the elliptical position of the segment before prestressing to be rounded, supporting areas that are prone to deformation or are subject to eccentric loads. The prestressing mechanism of the half-moon-shaped reaction support beam is a jacking system preset in the half-moon-shaped structure, and the jacking system is a hydraulic cylinder group.

[0059] In the through-type prestressing mechanism, after the prestressing ring is assembled using the segment assembly machine, the shield thrust cylinder presses against the circular tool ring section to perform stranding, anchoring, prestressing, and grouting inside the ring. The through-type prestressing mechanism includes through-type tensioning jacks 5, hydraulic oil pipes 16, an automatic control system, and a hydraulic station 17.

[0060] The auxiliary tooling of this application can be divided into large and small ring tooling (the large ring tooling is for prestressing, and the small ring tooling is for full ring tooling), which can be quickly installed and disassembled using a shield machine segment assembly machine; the correction and limiting half-moon reaction support beam is a detachable lined steel box beam; the through-hole post-tensioned segments and the tensioning anchoring system attached to the large ring tooling; the correction and restraint hydraulic system attached to the small ring tooling.

[0061] According to another embodiment of the present invention, an external working platform is also included as a supplement to the working platform of the segment assembly machine, which is connected to the working platform of the segment assembly machine by bolts to provide a working surface. The external working platform is composed of a disc-shaped steel pipe, a hydraulic jack, a limit hinge and a self-locking buckle. It adopts a quick disassembly and assembly mechanism, a cylinder support shoe and a segment assembly work platform for temporary fixation and external hanging. At the same time, the working platform can be extended outward to limit the position. Let personnel approach the prestressing end of the prestressing ring to work. The platform can increase the working surface by pulling out the pedestal, hinge limit and railing protection to ensure the safety of personnel working at height.

[0062] According to another embodiment of the present invention, a groove pre-embedded anchor cable mechanism is provided on the side of the 1-ring, 4-ring, 9-ring...5N-1 ring-back shield propulsion jack, and the groove depth satisfies the reserved length for threading the steel strand.

[0063] According to another embodiment of the present invention, a removable circular tool ring is composed of a removable circular steel box girder. The thickness of the circular tool ring can be 300 mm, and the width is the same as that of the lining segment. Its top, bottom, and web plates can all be made of 30 mm thick steel plates, and the internal reinforcing ribs and stiffeners can be made of 20 mm thick steel plates. The end faces are connected to the prestressing ring using inclined bolts combined with clamps to prevent direct shear at the connection point during correction force. Small cylinder workspaces are evenly spaced along the radial direction of the segment within the circular tool ring and can effectively limit the position. They are controlled by a series combination of hydraulic stations. The hydraulic jacking cylinder 13 and the hydraulic station constitute a circular hydraulic jacking system. The hydraulic jacking cylinder extends to the inner curved surface of the segment to limit the circular and tensioning segments. The inter-ring blocks of the circular steel box girder are connected with oblique bolts. The inter-ring blocks of the circular steel box girder are the same as the segments, so that they can be assembled using a segment assembly machine. The circular steel box girder and the prestressed ring are limited by oblique bolts and quick clips, and can be quickly assembled and disassembled using a segment assembly machine.

[0064] According to another embodiment of the present invention, the detachable prestressing ring adopts a circular steel box girder structure, the top plate, bottom plate and web plate of which can be made of 30mm thick steel plates, the internal reinforcing ribs and stiffeners can be made of 20mm thick steel plates, and the circular steel box girder is combined according to the segment division and the connection method between the rings. A through-core tensioning jack limit working chamber and a tensioning length automatic measurement feedback device are provided in the thrust direction of the circular steel box girder, and the hydraulic oil pipeline channel is connected in a whole circle, which can synchronously construct prestressing and ensure the synchronous tensioning and tightening of the steel strands. A protective cover is set during the tensioning process to ensure the safety of the through-core tensioning of the pipe segments; a bolt connection and a card code connection port are provided on the top of the back shield propulsion jack for splicing the full-circle tool ring; a quick positioning and fixing device is provided on the inner arc surface to splice the semi-lunar reaction support beam. The width of the prestressing ring can be 1000mm. The thickness of the prestressing ring = the thickness of the lining segment + the thickness of the full-circle tool ring. The prestressing ring adopts a ring-shaped steel box girder combination. Its block division and connection method are the same as the segment. A through-core tensioning jack and an anchor clamp 6 are set inside the prestressing ring to tension and tighten a group of lining steel strands passing through 5 rings.

[0065] According to another embodiment of the present invention, the half-moon reaction support beam and jacking system are positioned with the inner arc grooves of the full-circle tool ring and the prestressing ring, and are connected by bolts. The half-moon reaction support beam adopts a half-moon steel box beam structure, and is assembled and limited according to the position where the lining segment roundness exceeds the limit, the position where the segment is overloaded, or the position where the segment's own gravity elliptical deformation is concentrated; the half-moon steel box beam reserves a working space for the hydraulic jacking system in the full-circle tool ring as a reaction force reinforcement cavity, and is dynamically adjusted according to the full-circle hydraulic jacking system of the full-circle tool ring. The half-moon steel box beam structure is the same width as the full-circle tool ring + prestressing ring, and can be quickly assembled and disassembled on the inner arc surface of its combined circular ring, and its position is adjusted according to the stress concentration or elliptical deformation exceeding the limit point.

[0066] According to another embodiment of the present invention, the through-type prestressed mechanism is a steel strand tensioning mechanism that utilizes staggered or through-seam segments to assemble the segments to achieve through-hole penetration. The through-type prestressed mechanism includes a plurality of through-type tensioning jacks, which tension the through-type steel strand segment group through a prestressed application ring. The through-type prestressed tensioning mechanism utilizes a PLC automatic control system and utilizes formed lining segments that can provide sufficient friction and bonding force for synchronous tensioning and anchoring.

[0067] The through-type prestressing mechanism is attached to the detachable prestressing ring, connected to the hydraulic station through a hydraulic oil pipe bundle, and the entire ring of pipe segments is evenly tensioned through an automatic control system, so that the waterproof material between the rings is fully squeezed and deformed to achieve the waterproof function.

[0068] According to another embodiment of the present invention, a method for using a through-hole tensioned segment and a segment pre-tensioning auxiliary tooling comprises the following steps:

[0069] 1) Before prefabricating the segments, anchor pads are embedded inside the segments and pipes are inserted. In this embodiment, corrugated pipes are used. A groove is provided on the outer side of the force transmission part of the back jack section to reserve space for the anchoring anchors and clips of the pre-embedded anchor cable mechanism for later tensioning, and for the exposed length of the steel strands. An integrated anchor ring is embedded on the side of the shield pushing jack of the through-tensioning segment to place the anchor at the reserved working position of the prestressing ring. The steel strands in the segments are inserted into the grooves and staggered assembly of the segments to achieve through-seam assembly of segments at different points, such as Figure 11 and Figure 1 As shown;

[0070] 2) The tunnel shield moves forward or reaches the excavation, assembling the initial ring N of the lining tensioning. Before assembling the initial ring, install the fixed end embedded anchor cable mechanism in the reserved groove at the lower side of the jack on the back of the segment and insert the steel strand 15, lock the anchor position, arrange the reserved steel strand to ensure it is in the reserved hole, throw out the remaining steel strands of the tensioning unit from the reserved hole between the shield jack support shoes, straighten and arrange them, such as Figure 12 As shown;

[0071] 3) The shield machine uses the assembled lining to advance forward or the shield machine receives the excavation, assembles the lining tensioning segments with staggered or continuous seams, and passes the tensioning steel strand until the N+3 ring needs to pass the lower hole steel strand and the upper hole as the starting point steel strand and lock the tensioning fixed end, such as Figure 13 As shown;

[0072] 4) As the shield advances or the shield receives and excavates to the N+4 ring, the lower steel strand is inserted into the anchor embedded parts and then arranged. The lower steel strand continues to be perforated. At this time, the prestressing ring is assembled, such as Figure 14 As shown;

[0073] 5) After the steel strand passes through the reserved working groove of the prestressing ring, push the cylinder to support the prestressing ring. At this time, install the full-circle tool ring. If the roundness of the unconstrained ring segment exceeds the limit, install a half-moon reaction support beam at the position where the deformation exceeds the limit or the stress concentration point, and use the built-in hydraulic lifting cylinder 13 of the full-circle tool ring to perform fine adjustment and limit. Figure 15 As shown;

[0074] 6) Connect the through-tensioning jack built into the prestressing ring, and use the automatic control system to coordinate the tensioning of the ring segments 14 of the entire ring lining and lock them tightly. After the tensioning is completed, grouting is carried out, such as Figure 16 shown.

[0075] 7) Remove the half-moon reaction support beam, full-circle tool ring and prestressing ring, continue to step forward or receive excavation, and repeat the above steps 3)-6) until the shield stepping or receiving is completed.

[0076] Although the embodiments of the present invention have been disclosed above, they are not limited to the applications listed in the description and implementation methods. They can be fully applied to various fields suitable for the present invention. For those familiar with the art, additional modifications can be easily implemented. Therefore, without departing from the general concept defined by the claims and the scope of equivalents, the present invention is not limited to the specific details and embodiments shown and described herein.

Claims

1. A through-hole tensioned segment and segment pre-tensioning auxiliary tooling, characterized in that: include: For through-the-core tensioned shield lining segments, pre-embedded post-tensioning steel strands are symmetrically placed between the segment's force-transmitting concave and convex platforms or other locations. Anchor cable mechanisms are embedded on the back side of the shield propulsion jacks in rings 1, 4, 9, and 5N-1. Integrated anchor rings are embedded on the front side of the shield propulsion jacks in rings 5, 10, 15, and 5N. During shield assembly, post-tensioning steel strands are perforated and tightened as a unit of five rings. A detachable full-circle tool ring and a detachable prestressing ring; A half-moon-shaped reaction support beam and jacking system; the width of the half-moon-shaped reaction support beam equals the width of the full-circle tool ring plus the width of the prestressing ring. This rounds off the elliptical position of the segment before prestressing, supporting areas prone to deformation or those subject to eccentric loading. The half-moon-shaped reaction support beam prestressing mechanism is a jacking system pre-set within the half-moon-shaped structure. Through-type prestressing mechanism, including through-type tensioning jack, hydraulic oil pipe, automatic control system and hydraulic station; The detachable full-circle tool ring is composed of a detachable circular steel box beam, which has space inside for the hydraulic jacking cylinder; The width of the full-circle tool ring is the same as that of the lining segment. The ring steel box girder blocks are connected with oblique bolts. The ring steel box girder and the prestressing ring are limited by oblique bolts and quick clips, and are quickly assembled and disassembled using a segment assembly machine.

2. The through-core tensioned segment and segment pre-tensioning auxiliary tooling according to claim 1 is characterized in that: It also includes an external working platform, which provides a working surface by connecting with the working platform of the segment assembly machine.

3. The through-core tensioned segment and segment pre-tensioning auxiliary tooling according to claim 1 is characterized in that: A groove pre-embedded anchor cable mechanism is set on the side of the 1-ring, 4-ring, 9-ring...5N-1 ring back shield thrust jack, and the groove depth meets the reserved length for passing the steel strand.

4. The through-hole tensioned segment and segment pre-tensioning auxiliary tooling according to claim 1 is characterized in that: The prestressing ring adopts steel structure. The thickness of the prestressing ring = the thickness of the lining segment + the thickness of the full-circle tool ring. A through-core tensioning jack is set inside the prestressing ring to tension and tighten a group of lining steel strands that pass through 5 rings.

5. The through-core tensioned segment and segment pre-tensioning auxiliary tooling according to claim 1 is characterized in that: The semi-lunar reaction support beam adopts a semi-lunar steel box beam structure, and is assembled and limited according to the position where the lining segment roundness exceeds the limit, the position where the segment is subjected to eccentric load, or the position where the segment's own gravity elliptical deformation is concentrated; a reaction reinforcement cavity is set in the semi-lunar steel box beam.

6. The through-core tensioned segment and segment pre-tensioning auxiliary tooling according to claim 5, characterized in that: The through-type prestressing mechanism is attached to the detachable prestressing ring, connected to the hydraulic station through a hydraulic oil pipe bundle, and balanced tensioning of the entire ring of pipe segments is carried out through an automatic control system.

7. A method for using the through-hole tensioned segment and the segment pre-tensioning auxiliary tooling according to any one of claims 1 to 6, characterized in that: The following steps are involved: 1) Before prefabricating the segments, anchor pads are embedded inside the segments and pipes are inserted. A groove is provided on the outer side of the force transmission part of the back jack section to reserve space for the initial anchorage of the segments, the clips, and the exposed length of the steel strands during the subsequent tensioning process. An integrated anchor ring is embedded in the end-of-tension segment on the side facing the shield thrust jack, which is used to place anchors at the reserved working position of the prestressing ring. The steel strands in the segments are grooved and assembled in a staggered manner to achieve continuous seams after assembling segments at different points. 2) The tunnel shield advances forward or reaches the excavation stage, assembling the initial ring N for lining tensioning. Before assembling the initial ring, install the fixed end embedded anchor cable mechanism in the reserved groove at the lower side of the jack on the back of the segment and insert the steel strand. Lock the anchor position, arrange the reserved steel strand to ensure it is in the reserved hole, and throw out the remaining steel strands of the tensioning unit from the reserved hole between the shield jack shoes, straighten and arrange them; 3) The shield machine advances forward using the assembled lining or receives the tunneling, assembling the lining tensioning segments with staggered or continuous seams, and inserting the tensioning steel strand until the N+3 ring needs to be inserted through the lower hole steel strand, and the upper hole is used as the starting point steel strand and the tensioning fixed end is locked; 4) As the shield advances or the shield receives and excavates to the N+4 ring, the lower steel strand is inserted into the anchor embedded parts and then arranged. The lower steel strand continues to be pierced and the prestressing ring is assembled at this time; 5) After the steel strand passes through the reserved working groove of the prestressing ring, push the cylinder to support the prestressing ring. At this time, install the full-circle tool ring. If the roundness of the unconstrained ring segment exceeds the limit, install a half-moon reaction support beam at the position where the deformation exceeds the limit or the stress concentration point, and use the built-in cylinder of the full-circle tool ring to perform fine adjustment and limit. 6) Connect the through-tensioning jack built into the prestressing ring, use the automatic control system to coordinate tensioning and locking of the entire ring lining, and grouting after tensioning is completed; 7) Remove the half-moon reaction support beam, full-circle tool ring and prestressing ring, continue to step forward or receive excavation, and repeat the above steps 3)-6) until the shield stepping or receiving is completed.

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