Cross-core tensioning type duct piece, duct piece pre-tensioning auxiliary tool and using method

Abstract

The invention discloses a cross-core tensioning type duct piece, a duct piece pre-tensioning auxiliary tool and a using method. The cross-core tensioning type duct piece comprises a cross-core tensioning type shield lining duct piece, pre-buried post-tensioned steel strand penetrating pipes are symmetrically arranged on a duct piece force transmission concave-convex table or between other positions, and an anchor cable mechanism is pre-buried on the side back to a shield propelling jack; an integrated anchor ring is pre-buried on the side facing the shield tunneling jack; in the shield assembling process, the post-tensioned steel strand is perforated; a detachable full circle tool ring and a detachable prestress applying ring; a half-moon-shaped counter-force supporting beam and a pushing system; rounding the ellipse change position of the pipe piece before the prestress is applied, and supporting the easily deformed part or the part, subjected to unbalance loading, of the pipe piece; the half-moon-shaped counter-force supporting beam prestress applying mechanism is a pushing system preset in a half-moon-shaped structure. The problems that the shield tunneling machine has no resistance or is insufficient in resistance at the front end of the cutterhead, so that the shield segment assembly force is insufficient, the segment waterproof failure occurs, and the lining ellipse deformation is out-of-round and deformed are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of shield tunnel construction. More specifically, the present invention relates to a through-tension segment, a segment pre-tensioning auxiliary tooling and a usage method thereof. Background Art

[0002] With the development of the urbanization process, the highway road network and the railway road network need to be extended and connected more widely. Highway tunnels and railway tunnels pass through mountains and cross seas, and are developing towards larger diameters, longer distances, greater depths, and crossing various complex strata. Under the existing shield tunneling technology conditions, the functional expansion of various shields such as conventional cutterhead shields, normal pressure cutterhead shields, conventional cutterhead slurry and TBM dual-mode shields cannot complete the construction tunneling of extremely hard rock sections within the contract period. Adding shafts and increasing the number of shield machines, and using the mining method for the extremely hard rock section and then pushing the shield through the existing mined tunnel become important methods to solve the construction period problem. However, when using the lining segment to push through the mined tunnel, how to press the segment tightly when there is no reaction force or insufficient reaction force at the front end, so that the waterproof material between the rings can be effectively deformed to achieve its waterproof function is a difficult problem to be solved urgently at present.

[0003] Similarly, when the shield machine enters the receiving well during shield tunneling and reception, the segments in the receiving section are prone to relaxation when there is no constraint or less constraint at the front end, and the waterproof between the segment rings is not effectively extruded and deformed to form a good water-stop function, which also causes leakage risks and disposal costs for the later operation and maintenance of highway tunnels or railway tunnels. The conventional method of tightening the embedded steel plates on the inner arc surface cannot effectively solve such problems.

[0004] In the above problems, due to the lack of reaction force or insufficient reaction force at the front end of the shield, the segments will be relaxed and deformed, and the waterproof material between the segment rings cannot be effectively compressed and deformed, resulting in the inability to form a waterproof function. When a water-permeable channel appears, it will cause continuous leakage of the tunnel, insufficient durability, and even tunnel damage, bringing great risks to the operation safety of the tunnel. Summary of the Invention

[0005] The purpose of the present invention is to provide a through-tension segment, a segment pre-tensioning auxiliary tooling and a usage method thereof to solve the problems that the assembly force of the shield segments is insufficient due to the lack of or insufficient resistance force at the front end of the cutterhead of the shield machine, resulting in the failure of segment waterproofing and the elliptical deformation 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-tension segment, a segment pre-tensioning auxiliary tooling, including: The through-tension shield lining segment has post-tensioned steel strands passing through pipes symmetrically arranged between the force-transferring bosses or other positions of the segment. Anchor cable mechanisms are embedded on the side of the 1st, 4th, 9th... (5N - 1)th rings facing away from the shield propulsion jacks; integral anchor rings are embedded on the side of the 5th, 10th, 15th... 5Nth rings facing the shield propulsion jacks. During the shield assembly process, the post-tensioned steel strands are perforated and tightened in units of 5 rings. The demountable full-circle tool ring and the demountable prestress application ring; The semi-circular reaction support beam and the jacking system; the width of the semi-circular reaction support beam = the width of the full-circle tool ring + the width of the prestress application ring, which rounds the elliptical deformation position of the segment before prestress application and supports the easily deformed or eccentrically loaded parts of the segment. The prestress application mechanism of the semi-circular reaction support beam is a jacking system preset within the semi-circular structure, and the jacking system is a hydraulic cylinder group. The through-type prestress mechanism includes a through-tension jack, hydraulic oil pipes, an automatic control system, and a hydraulic station.

[0007] As a further scheme of the present invention: it further includes an external working platform, which provides a working surface by connecting with the working platform of the segment erector.

[0008] As a further scheme of the present invention: a groove is provided on the side of the 1st, 4th, 9th... (5N - 1)th rings facing away from the shield propulsion jacks to embed the anchor cable mechanism, and the groove depth meets the reserved length for passing the steel strands.

[0009] As a further scheme of the present invention: the demountable full-circle tool ring is composed of demountable circular steel box girders, and a space is provided inside to place the hydraulic lifting cylinders; The width of the full-circle tool ring is the same as that of the lining segment. The circular steel box girders are connected in sections between rings by inclined bolts. The circular steel box girders and the prestress application ring are limited by inclined bolts and quick buckles, and are quickly disassembled and assembled using the segment erector.

[0010] As a further scheme of the present invention: the prestress application ring is made of steel structure, the thickness of the prestress application ring = the thickness of the lining segment + the thickness of the full-circle tool ring, and a through-tension jack is provided inside the prestress application ring for tensioning and tightening the 5-ring group of lining steel strands.

[0011] As a further scheme of the present invention: the semi-circular reaction support beam adopts a semi-circular steel box girder structure, and is assembled and limited according to the position where the roundness of the lining segment exceeds the limit, the position where the segment is eccentrically loaded, or the position where the self-weight ellipse of the segment is concentrated; a reaction force strengthening cavity is provided inside the semi-circular steel box girder.

[0012] As a further scheme of the present invention: the through-type prestress mechanism is attached inside the demountable prestress application ring, connected to the hydraulic station through a bundle of hydraulic oil pipes, and the full-ring segments are evenly tensioned through the automatic control system.

[0013] The present invention also provides a method for using a through-hole tensioned pipe segment and a pipe segment pre-tensioning auxiliary tooling, comprising the following steps: 1) Before prefabricating the segments, anchor pads are embedded inside the segments and pipes are inserted. A groove is provided outside the force transmission part of the back jack section to reserve space for the initial anchorage of the segments and the exposed length of the clips and steel strands for the later tensioning. An integrated anchor ring is embedded on the side of the shield advancement jack of the segment for the final ring of the tensioning through-hole, which is used to place anchors at the reserved working position of the prestressing ring. The steel strands in the segments are inserted into the grooves and assembled in staggered joints to achieve through-joint assembly of the segments at different points. 2) The tunnel shield moves forward or reaches the excavation, assembles 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 part of the back jack of the segment and insert the steel strand, lock the anchor position, arrange the reserved steel strand to ensure that it is in the reserved hole, throw out the remaining steel strands of the tensioning unit in the reserved hole between the shield jack support shoes, straighten and arrange; 3) The shield machine uses the assembled lining to step forward or the shield machine receives the excavation, assembles the lining tensioning segments with staggered or through seams, and passes the tensioning steel strands until the N+3 ring needs to pass the steel strands in the lower hole and the upper hole as the starting point steel strands and lock the tensioning fixed end; 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, and the lower steel strand continues to be perforated. At this time, the prestressing ring is assembled; 5) After the steel strand passes through the reserved working groove of the prestressing ring, the cylinder is pushed to support the prestressing ring. At this time, the full-circle tool ring is installed. If the roundness of the unconstrained ring segment exceeds the limit, a half-moon reaction force support beam is installed at the position where the deformation exceeds the limit or the stress concentration point, and the built-in cylinder of the full-circle tool ring is used for fine adjustment and limit; 6) Connect the through-hole tensioning jack built into the prestressing ring, use the automatic control system to coordinate the tensioning of the entire ring lining and lock it to maintain it, and grouting is carried out after the tensioning is completed.

[0014] 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.

[0015] The present invention has at least the following beneficial effects: 1. The propulsion force provided by the shield propulsion system is not used as the assembly force for compacting the segments, so as to solve the problem of insufficient assembly force between the lining rings around the cutter head and shield body that are unconstrained and without resistance.

[0016] 2. Solve the problem of loose segments during shield tunnel construction, convert the traditional loose inner arc welding limit of the segment into a segment through-the-core tensioning and extrusion limit to achieve an inter-ring waterproof mechanism.

[0017] 3. Effectively solve the problem of shield tunneling when suddenly encountering full-face or large-section hard rock in a long and variable strata with a single-heading tunnel. After converting the construction method to the mined tunnel method, use the full-ring lining to assemble and tension tightly, and assist the stepping process to improve the tunnel construction efficiency, maintain the healthy state of the shield machine and extend its service life. The effective combination of the construction methods expands the scope of shield machine construction and the constraints of shield selection.

[0018] 4. Utilize the existing assembly structure system of the shield machine to realize the rapid assembly and disassembly of the tool ring, and solve the technical pain points of segment relaxation, out-of-roundness and insufficient assembly force through automatic through-hole tensioning.

[0019] 5. The automatic control platform can automatically solve the problems of out-of-position jacking and circularity adjustment and limit of the segment circularizing tool ring, and synchronously perform through-hole tensioning on the segments to achieve their assembly force, which is safe and efficient.

[0020] 6. The attached external working platform can be temporarily fixed and hung outside by using the segment erector, cylinder shoe and segment assembly working platform. At the same time, the working platform can extend outwards for limiting. Realize the rapid full coverage of the working platform for operators at high altitudes.

[0021] Other advantages, objectives and features of the present invention will be partially reflected by the following description, and partially will also be understood by those skilled in the art through the research and practice of the present invention. Description of the Drawings

[0022] Figure 1 is the elevation view of the shield lining segment with through-hole tensioning of the present invention; Figure 2 is the side plan view of the shield lining segment with through-hole tensioning facing the jack of the present invention; Figure 3 is the side plan view of the shield lining segment with through-hole tensioning back to the jack of the present invention; Figure 4 is the schematic diagram of the circularizing tool ring of the present invention; Figure 5 is Figure 4 the detailed connection drawing of the divided blocks of the circularizing tool ring in Figure 6 is Figure 4 the sectional view of the A-A circular steel box girder in Figure 7 is the front view of the positional relationship among the prestressed tool ring - circularizing tool ring - segment - semi-circular steel box girder; Figure 8 is the side view of the positional relationship among the prestressed tool ring - circularizing tool ring - segment - semi-circular steel box girder; Figure 9 is the front view of the circularizing and pre-tensioning and tightening of the formed lining segment; Figure 10It is the side view of the full circle and pre-tensioned tightening of the formed lining segment; Figure 11 It is a three-dimensional schematic diagram of the pre-embedded segment channel; Figure 12 It is a schematic diagram of the initial ring of assembly anchorage tensioning; Figure 13 It is to use the ring lining to step or receive the tunneling segment assembly, and the steel strand perforation diagram; Figure 14 It is a schematic diagram of assembling two prestressed tension steel rings and threading steel strands; Figure 15 It is to install the full circle tool ring and the half-moon reaction support beam to make a full circle schematic diagram; Figure 16 It is a schematic diagram of coordinated tensioning and anchoring of the full ring lining using an automatic control system.

[0023] Among them, 1-pre-buried anchor cable mechanism (1#, 4#, 9#, 14# rings...5N-1 ring) is embedded in the back jack surface segment; 2-pre-buried anchor ring of the segment; 3-pre-buried channel; 4-pre-buried integrated anchor ring of the front jack surface segment; 5-through tensioning jack; 6-anchor clamp; 7-prestressing ring; 8-block line of the full circle tool ring; 9-block connection of the full circle tool ring; 10-full circle tool ring bolt connection; 11-full circle tool ring; 12-half-moon 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-stiffening plate, 21-bolt connection plate. DETAILED DESCRIPTION

[0024] The present invention is described in detail and completely below in conjunction with the accompanying drawings. A person of ordinary skill in the art will be able to implement the present invention based on these descriptions. Before describing the present invention in conjunction with the accompanying drawings, it should be particularly pointed out that the technical solutions and technical features provided in each part of the present invention, including the following description, can be combined with each other without conflict.

[0025] In addition, the embodiments of the present invention involved in the following description are generally only a part of the embodiments of the present invention, rather than all the embodiments. Therefore, based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0026] In view of the technical problems in the existing shield tunneling through mined tunnels using lining rings for stepping or in the lining assembly of the receiving section of shield tunneling, where the segment is prone to convergent ovalization and the waterproof gasket between segment rings cannot be effectively deformed and pressed due to insufficient assembly force to form water stoppage, the purpose of the present invention is to provide a shield lining segment with a through-tensioning type, a pre-tensioning auxiliary tooling for segment assembly, and a construction method for pre-tensioning and tightening the formed lining segments. It solves the risks brought by insufficient assembly force between segments from three dimensions: the prefabrication of through-prestressed segments, the design of the pre-tensioning auxiliary tooling for shield assembly, and the method of through-tensioning and tightening the formed lining segments, and systematically solves the series of problems of segment relaxation caused by insufficient reaction force at the front end of the shield machine. The present invention does not require modification of the segment prefabrication mold, and at the same time, both the tooling and the through-prestressed application method utilize the auxiliary equipment of the shield machine itself, with a high degree of automation and safety control throughout the process. This tooling can be reused repeatedly, can be disassembled, converted, or even modified quickly, has a high turnover rate and utilization rate, has no waste parts, and can be applied to 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, with high practicability and wide applicability.

[0027] The following further elaborates on the present invention in conjunction with the attached drawings and embodiments, and the specific implementation process is as follows: As Figures 1 - 10 shown, the present invention provides a through-tensioning type segment and a pre-tensioning auxiliary tooling for segments, including: The through-tensioning type shield lining segment is pre-embedded with ducts 3 according to the prestressing requirements of ordinary segments, and devices for strengthening, fixing the anchoring end and the tensioning end are pre-embedded. After tensioning, grouting is carried out in the ducts. Specifically: symmetrically set 2 pre-embedded post-tensioned steel strand ducts between the force-transferring bosses or other positions of the segment (other positions refer to some types of segments without force-transferring bosses, and the ducts can be passed through at positions on the segment avoiding the main reinforcement), forming pre-embedded ducts. When prefabricating the segment, in combination with the position of the segment force-transferring mechanism, centrally pre-embed the post-tensioned steel strand ducts. Embed the embedded anchor rings 2 and the embedded cable anchor mechanisms 1 on the segments on the side of the shield propulsion jacks at the 1st ring, 4th ring, 9th ring... 5N - 1st ring; embed the integral anchor rings 4 on the side of the segments facing the shield propulsion jacks at the 5th ring, 10th ring, 15th ring... 5Nth ring for use in the tensioning of the prestressed application rings; during the shield assembly process, perforate the post-tensioned steel strands and tighten them in units of 5 rings. The detachable full-circle tool ring 11 and the detachable prestressed application ring 7; as Figure 9 shown, the segmented connection 9 of the full-circle tool ring is the same as the segment blocks and can be installed using a segment erector without adding other auxiliary equipment; it can also be the bolt connection 10 of the full-circle tool ring, which can achieve rapid assembly and disassembly and is convenient for reuse. The full-circle tool ring is bolt-connected to the prestressed application ring, and the segments of the full-circle tool ring are bolt-connected by setting bolt connection plates 21 and bolt holes 19, and stiffening plates 20 are provided on the bolt connection plates.Figure 4 As shown, the segmentation line 8 of the full-circle tool ring is the same as the segmentation line of the through-hole tension shield lining segment 18 .

[0028] Half-moon reaction support beam 12 and jacking system; to ensure that the formed 5-ring group of segments are effectively tensioned by using the consolidation cohesion and friction between the formed tunnel and the stratum, the width of the half-moon reaction support beam = the full circle tool ring width + the prestressing ring width, and the flexible installation position change is used to round the elliptical position of the segment before prestressing, and support the easily deformed or eccentrically loaded parts of the segment; the half-moon reaction support beam prestressing mechanism is a jacking system preset in the half-moon structure, and the jacking system is a hydraulic cylinder group; The through-type prestressing mechanism, after the prestressing ring is assembled by the segment assembly machine, the shield thrust cylinder supports the entire circular tool ring section, and the steel strands are combed, anchored, prestressed, and grouting maintenance is performed inside the circular ring. The through-type prestressing mechanism includes a through-type tensioning jack 5, a hydraulic oil pipe 16, an automatic control system, and a hydraulic station 17.

[0029] The auxiliary tooling of the present application can be divided into large and small circular ring tooling (the large circular ring tooling is for prestressing, and the small circular ring tooling is for full circular 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-core post-tensioning segment and the tensioning anchoring system attached to the large circular ring tooling; the correction and restraint hydraulic system attached to the small circular ring tooling.

[0030] According to another embodiment of the present invention, it also includes an external working platform as a supplement outside 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, and the working platform can be extended outward to limit the position. Let personnel approach the prestressing end of the prestressing ring to work, and 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 heights.

[0031] 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 thrust jack, and the groove depth satisfies the reserved length for threading the steel strand.

[0032] According to another embodiment of the present invention, the detachable integral circular tool ring is composed of detachable circular steel box girders. The thickness of the integral circular tool ring can be 300 mm, and the width of the integral circular tool ring is the same as that of the lining segment. The top plate, bottom plate and web plate can all adopt 30 mm thick steel plates, and the internal stiffening ribs and gusset plates can adopt 20 mm thick steel plates. The end face is connected to the prestress application ring by inclined bolts combined with clamping codes to avoid direct shear at the connection position when correcting the force. Small oil cylinder working chambers are arranged at equal intervals along the radial direction of the segment inside the integral circular tool ring and can effectively limit the position, and are controlled by the series combination of hydraulic stations. The hydraulic jacking cylinder 13 and the hydraulic station constitute the integral circular hydraulic jacking system. The hydraulic jacking cylinder extends and tops against the inner arc surface of the segment for circularization and tension-type segment position limitation. The circular steel box girders are connected in blocks by inclined bolts between the rings. The circular steel box girders are divided into blocks in the same way as the segments, so that the segment assembling machine can be used for assembly. The circular steel box girders and the prestress application ring are limited by inclined bolts and quick buckles, and the segment assembling machine is used for quick disassembly and assembly.

[0033] According to another embodiment of the present invention, the detachable prestress application ring adopts a circular steel box girder structure. The top plate, bottom plate and web plate can all adopt 30 mm thick steel plates, and the internal stiffening ribs and gusset plates can adopt 20 mm thick steel plates. The circular steel box girders are combined according to the segment division and the connection method between the rings. A jacking-through tensioning jack limiting working chamber and a tensioning length automatic measurement and feedback device are arranged along the thrust direction inside the circular steel box girders, and the hydraulic oil pipeline channels are connected in a whole circle, so that prestress can be constructed synchronously to ensure synchronous tensioning and tightening of the steel strands. A protective cover is arranged during the tensioning process to ensure the safety of the segment jacking-through tensioning; bolt connection and clamping code connection ports are arranged at the end of the back shield propulsion jack for splicing the integral circular tool ring; a quick positioning and fixing device is arranged on the inner arc surface for splicing the semi-circular reaction support beam. The width of the prestress application ring can be 1000 mm, and the thickness of the prestress application ring = the thickness of the lining segment + the thickness of the integral circular tool ring. The prestress application ring adopts a combination of circular steel box girders, and its block division and connection method are the same as those of the segments. A jacking-through tensioning jack and an anchoring fixture 6 are arranged inside the prestress application ring for tensioning and tightening the steel strands of a group of 5-ring lining segments.

[0034] According to another embodiment of the present invention, the semi-circular reaction support beam and the jacking system are positioned in the inner arc surface groove of the integral circular tool ring and the prestress application ring and are connected by bolts. The semi-circular reaction support beam adopts a semi-circular steel box girder structure and is assembled and limited according to the position where the roundness of the lining segment exceeds the limit, the position where the segment is subjected to eccentric load or the position where the self-weight ellipsoidal deformation of the segment is concentrated; a working space for the integral circular hydraulic jacking system inside the integral circular tool ring is reserved inside the semi-circular steel box girder as a reaction force strengthening cavity, and dynamic adjustment is carried out according to the integral circular hydraulic jacking system of the integral circular tool ring. The structure of the semi-circular steel box girder is the same width as that of the integral circular tool ring + the prestress application ring, and is quickly disassembled and assembled on the inner arc surface of the combined ring, and position adjustment is carried out according to the stress concentration or ellipsoidal deformation exceeding the limit points.

[0035] According to another embodiment of the present invention, the through-type prestressing mechanism is a steel strand tensioning mechanism that realizes the penetration of the duct by using segment lining assembled with staggered joints or continuous joints. The through-type prestressing mechanism includes a plurality of through-type tensioning jacks, and the prestressing force is applied through a prestressing application ring to tension the steel strand segment group. The through-type prestressing tensioning mechanism uses a PLA automatic control system and uses the formed lining segments that can provide sufficient friction and bonding force for synchronous tensioning and anchoring.

[0036] The through-type prestressing mechanism is attached to a detachable prestressing application ring, connected to a hydraulic station through a hydraulic oil pipe bundle, and the full-ring segments are evenly tensioned through an automatic control system, so that the waterproof materials between the rings are fully squeezed and deformed to achieve the waterproof function.

[0037] According to another embodiment of the present invention, a method for using a through-type tensioning segment and a segment pre-tensioning auxiliary tooling includes the following steps: 1) Before precasting the segments, embed an anchor backing plate inside the segments and insert a through-pipe. In this embodiment, a corrugated pipe is used. A groove is provided on the outside of the force-transmitting part of the back jack section to reserve space for the anchoring anchor and clamp of the pre-embedded cable mechanism for later tensioning and the exposed length of the steel strand; an integral anchor ring is pre-embedded on the side of the last ring segment facing the shield propulsion jack during through-type tensioning for placing the anchor in the reserved working position of the prestressing application ring; the inner steel strand inner through-channel of the segment is combined with the staggered joint assembly of the segment to achieve a continuous joint after assembling the segments at different points, as Figure 11 and Figure 1 shown; 2) When the tunnel shield advances forward or reaches the excavation, assemble and tension the initial ring N. Before assembling the initial ring, install a fixed-end pre-embedded cable mechanism in the groove reserved at the lower part of the back of the segment and insert the steel strand 15, lock the anchoring position, and sort out the reserved steel strand to ensure that it is in the reserved hole. The remaining steel strands of the tensioning unit are left in the hole between the shield jack shoes, straightened and sorted out, as Figure 12 shown; 3) The shield machine uses the assembled lining to advance forward or the shield receives the excavation, assembles and tension the segments with staggered joints or continuous joints, inserts the tensioning steel strand until the lower hole steel strand needs to be inserted in the N + 3 ring, and the upper hole is used as the starting point steel strand and the tensioning fixed end is locked and fixed, as Figure 13 shown; 4) As the shield advances or the shield receives the excavation to the N + 4 ring, after the lower steel strand is inserted into the anchoring embedded part, it is sorted out, and the lower steel strand continues to pass through the hole. At this time, the prestressing application ring is assembled, as Figure 14 shown; 5) After the steel strand passes through the reserved working groove of the prestress application ring, the propulsion cylinder presses against the prestress application ring. At this time, install the full-round tool ring. If the roundness of the unconstrained forming segment exceeds the limit, install a semi-circular reaction support beam at the position where the deformation exceeds the limit or at the stress concentration point, and use the built-in hydraulic jacking cylinder 13 of the full-round tool ring for fine adjustment and limit, as Figure 15 shown; 6) Connect the through-hole tensioning jack built in the prestress application ring, and use the automatic control system to perform coordinated tensioning and locking of the full-ring lining segments 14 and maintain them. After the tensioning is completed, grout, as Figure 16 shown.

[0038] 7) Remove the semi-circular reaction support beam, the full-round tool ring and the prestress application ring, continue to step forward or receive tunneling, and repeat the above steps 3)-6) until the shield tunneling or receiving is completed.

[0039] Although the embodiments of the present invention have been disclosed above, it is not limited to the applications listed in the specification and embodiments. It can be fully applied to various fields suitable for the present invention. For those familiar with the field, additional modifications can be easily made. Therefore, without departing from the general concept defined by the claims and the equivalent scope, the present invention is not limited to the specific details and the embodiments shown and described here.

Claims

1. A through-tensioning segment and a segment pre-tensioning auxiliary tooling, characterized in that include: For through-core tensioned shield lining segments, pre-buried post-tensioned steel strands are symmetrically arranged between the segment force-transmitting concave and convex platforms or other positions, and anchor cable mechanisms are pre-buried on the 1st, 4th, 9th, and 5N-1 ring back shield propulsion jack sides; integrated anchor rings are pre-buried on the 5th, 10th, 15th, and 5N ring front shield propulsion jack sides; during the shield assembly process, the post-tensioned steel strands are perforated and tightened as a unit of 5 rings; A detachable full-circle tool ring and a detachable prestressing ring; Half-moon shaped reaction support beam and jacking system; half-moon shaped reaction support beam width = full circle tool ring width + prestressing ring width, 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 through-type prestressed mechanism comprises a through-type tensioning jack, a hydraulic oil pipe, an automatic control system and a hydraulic station.

2. The through-tensioning segment and the segment pre-tensioning auxiliary tooling according to claim 1, 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 core-pulling and tensioning segment and the segment pre-tensioning auxiliary tooling according to claim 1, wherein A groove for embedding anchor cable mechanism is arranged 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 threading the steel strand.

4. The through-tension segment and the segment pre-tensioning auxiliary tooling according to claim 1, wherein The detachable full-circle tool ring is composed of a detachable circular steel box beam, and a space is provided inside the detachable circular steel box beam to accommodate a hydraulic jacking cylinder; The width of the full-circle tool ring is the same as that of the lining segment. The ring blocks of the circular steel box girder are connected with oblique bolts. The circular 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.

5. The through-tension segment and the segment pre-tensioning auxiliary tooling according to claim 1 or 4, 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-hole tensioning jack is arranged inside the prestressing ring to tension and tighten a group of lining steel strands that penetrate 5 rings.

6. The through-tension segment and the segment pre-tensioning auxiliary tooling according to claim 4, characterized in that The half-moon shaped reaction support beam adopts a half-moon shaped 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 concentrated position of the segment's own gravity elliptical deformation; a reaction reinforcement cavity is set in the half-moon shaped steel box beam.

7. The through-tensioning segment and the segment pre-tensioning auxiliary tooling according to claim 6, wherein, 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 segments is carried out through an automatic control system.

8. A method for using a through-tension segment and a pre-tensioning auxiliary tooling for segments as described in any one of claims 1 to 7, characterized in that, The following steps are involved: 1) Before prefabricating the segments, anchor pads are embedded inside the segments and inserted into the pipes. A groove is provided outside 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 for the later tensioning. The pre-buried integrated anchor ring on the side of the shield thrust jack of the through-tension end ring segment is used to place anchors at the reserved working position of the prestressing ring; the steel strands in the segment are grooved and assembled in staggered seams to achieve through-seams after assembling segments at different points; 2) The tunnel shield moves forward or reaches the excavation, assembles 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 part of the back jack of the segment and insert the steel strand, lock the anchor position, arrange the reserved steel strand to ensure that it is in the reserved hole, throw out the remaining steel strands of the tensioning unit in the reserved hole between the shield jack support shoes, straighten and arrange; 3) The shield machine advances forward by assembling the lining or tunnels during shield reception. The lining segments are assembled with staggered or continuous joints, and the segment is tensioned. The tensioning steel strands are threaded until the steel strands for the lower holes need to be threaded for the (N + 3)th ring, and the steel strands for the upper holes are used as the starting point steel strands and the tensioning fixed ends are locked and tensioned; 4) As the shield advances or tunnels during shield reception to the (N + 4)th ring, the lower steel strands are threaded into the anchoring embedded parts and then sorted out. The lower steel strands continue to be threaded through the holes, and at this time, the prestressed application ring is assembled; 5) After the steel strands pass through the reserved working slot of the prestressed application ring, the propulsion cylinders press against the prestressed application ring. At this time, the full-circle tool ring is installed. If the roundness of the segment ring without restraint exceeds the limit, a semi-circular reaction support beam is installed at the position where the deformation exceeds the limit or the stress concentration point, and the built-in cylinders of the full-circle tool ring are used for fine adjustment and limit; 6) Connect the through-hole tensioning jacks built into the prestressed application ring, and use the automatic control system to perform coordinated tensioning and locking of the full-ring lining. After the tensioning is completed, grouting is carried out; 7) Remove the semi-circular reaction support beam, the full-circle tool ring and the prestressed application ring, continue to advance forward or tunnel during reception, and repeat the above steps 3)-6) until the shield advances or the reception is completed.

Images