Steel tie rod anchoring system for anchoring main cable of suspension bridge

Abstract

The utility model discloses a steel tie rod anchoring system for anchoring a main cable of a suspension bridge, the steel tie rod anchoring system comprises a cable strand connecting mechanism connected with a cable strand and a pre-stress anchoring mechanism anchored in an anchorage, and the cable strand connecting mechanism is connected to a tensioning end of the pre-stress anchoring mechanism through a connecting flat plate; the position, used for anchoring the prestress anchoring mechanism, of the anchorage is provided with a rod penetrating channel. The prestress anchoring mechanism is provided with steel pull rods, the steel pull rods are installed in the corresponding rod penetrating channels in a penetrating mode, the anchoring ends of the steel pull rods are connected with anchoring end locking assemblies at the rear anchoring ends of the corresponding rod penetrating channels, and the tensioning ends of the steel pull rods extend out of the corresponding rod penetrating channels and are connected with the connecting flat plate through the tensioning end locking assemblies. And an annular space in clearance fit is formed between the outer wall of the steel pull rod and the inner wall of the corresponding rod penetrating channel. The steel pull rod is anchored in the corresponding rod penetrating channel in the anchorage in a rod penetrating mode in a non-adhesive mode, on one hand, prestress tension can be reliably kept, and on the other hand, the steel pull rod can be replaced after stress is unloaded.

Description

Technical Field

[0001] The utility model relates to the main cable anchoring technology of suspension bridges, in particular to a steel tie rod anchoring system for the main cable anchoring of suspension bridges. Background Technique

[0002] In the structure of suspension bridges, the main cable is the core load-bearing structure that bears the static and dynamic loads of the bridge. To ensure the reliable load-bearing of the main cable for the static and dynamic loads of the bridge, the end of the main cable is diverged and then anchored in the corresponding anchor block through an anchoring system. That is to say, the main cable evenly distributes the loads it bears into the corresponding anchor block through the anchoring system, and then the anchor block transfers them to the foundation or rock mass to meet the overall stress technical requirements of the suspension bridge structure.

[0003] The prestressed anchoring system is one of the common anchoring structures used for the main cable anchoring of suspension bridges. It consists of a strand connection mechanism for connecting strands and a prestressed anchoring mechanism anchored in the anchor block. The adjusting tie rod of the strand connection mechanism is connected to the tension end of the prestressed anchoring mechanism through a connecting flat plate. For example, the technologies disclosed in the Chinese patent documents with the titles of "Main Cable Strand Anchoring Device for Suspension Bridge Anchor Block" (Publication No. CN 110578296 A, Publication Date December 17, 2019), "Anchoring Structure and Construction Method for Replaceable Anchor Block Anchoring System Tie Rods and Connectors" (Publication No. CN114197337 A, Publication Date March 18, 2022), "A Steel Anchor Rod Main Cable Anchoring Device for Suspension Bridges" (Publication No. CN 205242261 U, Publication Date May 18, 2016), etc. Compared with the traditional steel section anchoring system, the prestressed anchoring system has technical advantages such as a smaller overall project quantity, less steel consumption, flexible layout, convenient manufacturing and installation.

[0004] There are two structural forms for the anchoring of the prestressed anchoring system in the anchor block. One is the steel strand anchoring structure, such as the technologies of Publication No. CN 110578296 A and CN 114197337 A. The other is the steel tie rod anchoring structure, such as the technology of Publication No. CN205242261 U.

[0005] The prestressed anchoring system with the steel strand structural form is the most widely used prestressed anchoring system at present. It anchors multiple steel bundles in the corresponding anchoring channels of the anchor block, and fills grease in the anchoring channels by vacuum grouting to seal and anticorrode the steel strands. Since it is difficult to ensure the grouting density, it is easy to affect the durability of the steel strand seal and anticorrosion. Therefore, during the later service process, the steel bundles of the steel strands need to be replaced according to the corrosion and aging conditions of the steel strands. Also, due to the multi-strand steel bundle anchoring structure of the steel strands, its prestressed stress-bearing structure system is relatively complex, which leads to a more troublesome prestressed stress adjustment process, greater technical difficulty, that is, the operation process of the installation and anchoring process and the later steel bundle replacement process is complex, with high technical difficulty and high cost.

[0006] The prestressed anchorage system with a steel tie rod structure replaces the steel strand with a single steel tie rod that has a simple structure and clear stress, thereby effectively solving the technical problem of complex stress systems existing in the anchoring process of the steel strands of multi-strand steel bundles. However, the current prestressed anchorage system with a steel tie rod structure permanently anchors the steel tie rod in the anchor block. For example, in the technology with the publication number CN 205242261 U, the steel tie rod is permanently anchored in the anchor block through connectors at the rear anchor end, the rear anchor plate, spiral reinforcement, etc., similar to the traditional steel section anchorage system. The anti-corrosion of the steel anchor rod in the anchor block completely depends on the durability of the protective layer provided on the outer surface and cannot be replaced. In this kind of anchoring structure, in the early stage after anchoring installation, the prestress force can be guaranteed, but in the later stage after anchoring installation, with the gradual drying shrinkage of the anchor block concrete, serious prestress losses will occur, resulting in poor prestress of the steel tie rod during service, thus having an adverse impact on the safety of the main cable anchorage; in addition, under the continuous corrosion of erosive substances such as moisture, as the outer protective layer of the steel tie rod gradually ages, the steel tie rod will inevitably be corroded during service, directly increasing the safety hazards of the bridge during service in the non-replaceable anchoring structure.

[0007] Among the existing technologies known to the applicant, no technology that can effectively solve the service safety hazards of the prestressed anchorage system with a steel tie rod structure has been disclosed. Based on the technical characteristics and existing technical problems of the prestressed anchorage system with a steel tie rod structure, the applicant believes it is necessary to develop a prestressed anchorage system with a steel tie rod structure that can reliably maintain prestress and can be replaced during service. Summary of the Utility Model

[0008] The technical objective of the present utility model is: aiming at the particularity of the above-mentioned prestressed anchorage system with a steel tie rod structure and the deficiencies of the existing technology, to provide a steel tie rod anchorage system for the main cable anchorage of a suspension bridge that can reliably maintain prestress and can replace the steel tie rod during service.

[0009] The technical objective of the present utility model is achieved through the following technical solutions. A steel tie rod anchorage system for the main cable anchorage of a suspension bridge includes a strand connection mechanism for connecting the cable strands and a prestressed anchorage mechanism anchored in the anchor block;

[0010] The strand connection mechanism is connected to the tension end of the prestressed anchorage mechanism through a connection flat plate;

[0011] The position of the anchor block used for anchoring the prestressed anchorage mechanism has a rod-passing channel;

[0012] The prestressed anchoring mechanism has a steel tie rod, which is inserted into the corresponding rod-passing channel. The anchoring end of the steel tie rod is connected with an anchoring-end locking assembly at the rear anchoring end of the corresponding rod-passing channel. The tensioning end of the steel tie rod extends out of the corresponding rod-passing channel and is connected with the connecting flat plate through a tensioning-end locking assembly. And an annular space with clearance fit is formed between the outer wall of the steel tie rod and the inner wall of the corresponding rod-passing channel.

[0013] In view of the particularity of the prestressed anchoring system with the above-mentioned steel tie rod structure, the rod-passing channel for the steel tie rod is formed in the anchor block. For the steel tie rod inserted into the corresponding rod-passing channel, its anchoring end and tensioning end are prestressed and tensioned at the relative structures through the corresponding locking assemblies according to the construction technical requirements. This prestress tensioning basically will not be lost due to the dry shrinkage of the anchor block concrete and can be reliably maintained, thereby reducing the adverse effects of the alternating load during the installation of the cable strands on the steel tie rod and effectively reducing the fatigue of the steel tie rod itself. In addition, the steel tie rod is anchored in the corresponding rod-passing channel of the anchor block in a rod-passing and non-bonding manner, and the steel tie rod does not form a permanent anchor in the corresponding rod-passing channel and can be replaced after the force is unloaded. Therefore, during the service process, as there may be potential safety hazards in the steel tie rod, it can be disassembled and replaced, which is beneficial to reliably ensuring the safety of the main cable anchoring.

[0014] As one of the preferred solutions, the anchoring-end locking assembly mainly consists of an anchoring-end spherical washer and an anchoring-end nut. Under the locking force of the anchoring-end nut, the anchoring-end spherical washer abuts against the rear anchoring end of the rod-passing channel.

[0015] An anchoring-end ventilation hole I is opened on the anchoring-end spherical washer. The outer end of the anchoring-end ventilation hole I is communicated with a dehumidifier, and the inner end of the anchoring-end ventilation hole I is communicated with the annular space between the steel tie rod and the rod-passing channel.

[0016] The dehumidifier is used to blow air for dehumidification from the anchoring end of the steel tie rod to the tensioning end.

[0017] Based on the anchoring-end locking assembly of the steel tie rod, the above-mentioned technical measures connect a dehumidifier on the premise of not affecting the anchoring structure of the steel tie rod, so as to blow dry air into the annular space of the rod-passing channel for dehumidification, keep the steel tie rod in the annular space of the rod-passing channel dry and basically clean during the service process, reduce the erosion caused by moisture and other erosive substances to the steel tie rod, and delay the durability of the steel tie rod during service.

[0018] As one of the preferred solutions, an anchoring-end seal cover surrounding the anchoring end of the steel tie rod and the anchoring-end locking assembly is connected to the rear anchoring end of the rod-passing channel.

[0019] The anchoring-end seal cover is connected with the dehumidifier through a ventilation pipe, and the dehumidifier blows air for dehumidification into the anchoring-end seal cover.

[0020] The above technical measures use the sealing cover at the anchor end to isolate the anchor end structure of the steel tie rod, reducing the erosion of the anchor end of the steel tie rod by moisture and other corrosive substances. At the same time, the anchor end sealing cover is used to connect the dehumidifier, which, on the one hand, effectively reduces the technical difficulty of connecting the dehumidifier to the anchor end of the steel tie rod and is easy to implement; on the other hand, the anchor end sealing cover is used as a relatively independent chamber to introduce dry air to dehumidify the anchor end structure of the steel tie rod, so that the anchor end structure of the steel tie rod and the steel tie rod in the annulus of the rod-penetrating channel are kept dry and basically clean during the service process, reducing the erosion of the steel tie rod by moisture and other corrosive substances, and delaying the durability of the steel tie rod in service.

[0021] Furthermore, the rod-penetrating channel is formed by a pre-buried penetration pipe pre-buried in the anchor;

[0022] The rear anchor end of the pre-buried through-tube is connected to a rear anchor end pre-buried plate pre-buried in the anchor;

[0023] The steel tie rod installed in the embedded through-tube passes through the rear anchor end embedded plate, and the anchor end locking assembly connected to the anchor end of the steel tie rod abuts against the rear anchor end embedded plate;

[0024] An anchor end vent hole 2 with a clearance fit is formed between the outer wall of the steel tie rod and the inner hole of the rear anchor end embedded plate, the outer end of the anchor end vent hole 2 is connected to the dehumidifier, and the inner end of the anchor end vent hole 2 is connected to the annulus between the steel tie rod and the embedded through pipe.

[0025] The above technical measures, on the one hand, make it easy to form the rod channel in the anchorage regularly, accurately, reliably and stably; on the other hand, the pre-buried pipe forms a permanent and firm anchoring structure in the anchorage; and on the third hand, the installed steel tie rod can be reliably and stably prestressed on the pre-buried pipe. On this basis, drying and ventilation are combined to ensure the durability of the steel tie rod in service.

[0026] Furthermore, the locking abutment top end of the anchor end locking assembly abuts against the rear anchor end embedded plate through a pressure sensor;

[0027] The pressure sensor is used to dynamically collect the locking force of the anchor end locking assembly and provide feedback to the online monitoring controller;

[0028] The steel pull rod installed in the embedded through-tube passes through the pressure sensor, and an anchor end vent hole three with a clearance fit is formed between the outer wall of the steel pull rod and the inner hole of the pressure sensor. One end of the anchor end vent hole three is connected to the anchor end vent hole one on the anchor end spherical washer, and the other end of the anchor end vent hole three is connected to the anchor end vent hole two between the steel pull rod and the rear anchor end embedded plate.

[0029] The above technical measures arrange pressure sensors at the anchoring end of the steel tie rod. The pressure sensors dynamically collect the service stress state of the steel tie rod, so as to dynamically monitor the service stress state of the steel tie rod, ensuring that abnormal forces on the steel tie rod (such as loosening of the locking components, fracture of the steel tie rod, etc.) can be obtained in a timely manner, facilitating timely maintenance and replacement of the steel tie rod, and having better reliability. On this basis, combined with dry ventilation, the durability of the steel tie rod during service is guaranteed.

[0030] As one of the preferred solutions, a support cylinder is connected between the front anchor end of the rod passing channel and the connecting flat plate;

[0031] The steel tie rod installed in the rod passing channel passes through the support cylinder and the connecting flat plate;

[0032] A second vent hole for tensioning end with clearance fit is formed between the outer wall of the steel tie rod and the inner hole of the support cylinder. The inner end of the second vent hole for tensioning end communicates with the annulus between the steel tie rod and the rod passing channel, and the outer end of the second vent hole for tensioning end is used for discharging the gas in the annulus;

[0033] A third vent hole for tensioning end with clearance fit is formed between the outer wall of the steel tie rod and the inner hole of the connecting flat plate. The inner end of the third vent hole for tensioning end communicates with the second vent hole for tensioning end between the steel tie rod and the support cylinder, and the outer end of the third vent hole for tensioning end is used for discharging the gas in the annulus.

[0034] The above technical measures aim at the particularity of the connection between the tensioning end of the steel tie rod and the connecting flat plate and the strand connection mechanism. The support cylinder is used to support and position the connection position of the connecting flat plate at the tensioning end of the steel tie rod. On the one hand, it can enable the steel tie rod before strand installation to be reliably pre-stressed in the anchor according to the construction technical requirements, thereby reducing the adverse effects of alternating loads on the steel tie rod during strand installation and effectively reducing the fatigue of the steel tie rod itself; on the other hand, it can reliably support and guarantee the relative positions between the connecting flat plate, the adjusting tie rod of the strand connection mechanism and the anchor, prevent position interference with the anchor, and facilitate construction operations; on the third hand, aiming at the installation structure of the steel tie rod and the above dry ventilation airway structure, a reliable airway is formed in cooperation with the relative structure at the tensioning end of the steel tie rod, so that the dry air discharged from the annulus of the rod passing channel can effectively act on the tensioning end of the steel tie rod, keeping the structure of the tensioning end of the steel tie rod dry and basically clean during service, reducing the erosion caused by moisture and other erosive substances to the steel tie rod, and delaying the durability of the steel tie rod during service.

[0035] In the above technical measures, while realizing its transfer function, the connecting flat plate also plays the functions of pre-stressing the steel tie rod and maintaining the airway.

[0036] Furthermore, the tension end locking assembly of the steel tie rod at the connecting plate is mainly composed of a tension end spherical washer and a tension end nut. Under the locking force of the tension end nut, the tension end spherical washer abuts against the connecting plate.

[0037] The tensioning end spherical washer is provided with a tensioning end vent hole 4;

[0038] The inner end of the tensioning end vent hole four is connected to the tensioning end vent hole three between the steel tie rod and the connecting plate, and the outer end of the tensioning end vent hole four is used for exhausting the gas in the annulus.

[0039] The above-mentioned technical measures are aimed at the installation structure of the steel tie rod and the above-mentioned dry ventilation air duct structure. While maintaining its basic locking function, the relative structure at the tensioning end of the steel tie rod reliably forms an air duct, so that the dry wind discharged from the annulus of the rod-penetrating channel can effectively act on the tensioning end of the steel tie rod, so that the tensioning end structure of the steel tie rod can remain dry and basically clean during service, reduce the erosion of the steel tie rod caused by corrosive substances such as moisture, and delay the durability of the steel tie rod in service.

[0040] Furthermore, a tensioning end sealing cover for enclosing the tensioning end of the steel tension rod and the tensioning end locking assembly is connected to the connecting plate on the side opposite to the rod-penetrating channel, and the tensioning end sealing cover is used to collect the gas blown from the anchoring end;

[0041] An exhaust port is provided on the tensioning end sealing cover, and the exhaust port is used for exhausting the gas in the tensioning end sealing cover.

[0042] The above technical measures use the sealing cover at the tensioning end to isolate the tensioning end structure of the steel tie rod, reducing the erosion of the tensioning end of the steel tie rod by moisture and other corrosive substances. At the same time, the sealing cover at the tensioning end is used to collect the dry wind discharged from the anchoring end, so that the sealing cover at the tensioning end acts as a relatively independent chamber to collect and drain the dry wind, dehumidify the tensioning end structure of the steel tie rod, ensure the integrity of the drying of the entire steel tie rod, reduce the erosion of the steel tie rod by moisture and other corrosive substances, and delay the durability of the steel tie rod in service.

[0043] Furthermore, the rod-penetrating channel is formed by a pre-buried penetration pipe pre-buried in the anchor;

[0044] The front anchor end of the pre-buried pipe is connected to a front anchor end pre-buried plate pre-buried in the anchor;

[0045] The steel tie rod installed in the embedded through-tube passes through the front anchor end embedded plate, and the support tube installed on the tensioning end of the steel tie rod abuts against the front anchor end embedded plate;

[0046] A tensioning end ventilation hole one with a clearance fit is formed between the outer wall of the steel tie rod and the inner hole of the front anchor end embedded plate. The inner end of the tensioning end ventilation hole one communicates with the annulus between the steel tie rod and the embedded pipe, and the outer end of the tensioning end ventilation hole one is used to discharge the gas in the annulus into the tensioning end ventilation hole two between the steel tie rod and the support cylinder.

[0047] On the one hand, the above technical measures make the rod-passing channel in the anchor easy to be formed regularly, accurately, reliably and stably. On the other hand, the embedded pipe forms a permanent and firm anchoring structure in the anchor. On the third hand, the steel tie rod installed can achieve reliable and stable prestress tensioning on the embedded pipe. On this basis, combined with dry ventilation, the durability of the steel tie rod during service can be guaranteed.

[0048] As one of the preferred solutions, the steel tie rod is an extended structure, which is at least axially butt-connected and combined by two or more tie rod segments;

[0049] For two adjacent tie rod segments, i.e., tie rod segment one and tie rod segment two, the butt ends are commonly thread-connected in the same extension nut, and a locking nut one for locking the extension nut is connected to the tie rod segment one, and a locking nut two for locking the extension nut is connected to the tie rod segment two.

[0050] Aiming at the technical characteristics of the ultra-long size (about 30m) anchoring in the anchor of the prestressed anchoring system during the main cable anchoring construction and the current situation that the existing conventional steel tie rod size is difficult to meet the standard, the above technical measures axially extend at least two steel tie rods reliably through the extension nut and the locking nuts to meet the stress technical requirements and achieve the technical requirements for the ultra-long size anchoring of the prestressed anchoring system in the anchor.

[0051] The beneficial technical effects of the present utility model are as follows: Aiming at the particularity of the prestressed anchoring system with the above steel tie rod structure form, a rod-passing channel for the steel tie rod is formed in the anchor. For the steel tie rod installed in the corresponding rod-passing channel, the anchoring end and the tensioning end are prestress-tensioned through the corresponding locking components at the relative structures according to the construction technical requirements. This prestress tensioning basically will not be lost due to the dry shrinkage of the anchor concrete and can be reliably maintained, thereby reducing the adverse effects of the alternating load during the strand installation on the steel tie rod and effectively reducing the fatigue of the steel tie rod itself.

[0052] In addition, the steel tie rod is anchored in the corresponding rod-passing channel in the anchor in a rod-passing and non-bonding manner. The steel tie rod does not form a permanent anchoring in the corresponding rod-passing channel and can be replaced after the force is unloaded. Therefore, during the service process, as there may be potential safety hazards in the steel tie rod, it can be disassembled and replaced, which is beneficial to reliably guarantee the safety of the main cable anchoring.

[0053] On the basis of the non-permanent anchoring of the above-mentioned non-bonded steel tie rods, a complete air passage is formed by the installation structure of the steel tie rods, enabling the dry air discharged by the dehumidifier to flow from the anchoring end to the tensioning end along the steel tie rods. Thus, the service steel tie rods can be dried and dehumidified from the anchoring end to the tensioning end, ensuring the integrity of the drying of the entire steel tie rod, reducing the erosion caused by moisture and other erosive substances to the steel tie rod, and delaying the durability of the service of the steel tie rod. BRIEF DESCRIPTION OF THE DRAWINGS

[0054] Figure 1 It is a schematic structural diagram of the present utility model.

[0055] Figure 2 is Figure 1 a partial enlarged view of the anchoring end in

[0056] Figure 3 is Figure 1 a partial enlarged view of the joint of the steel tie rod in

[0057] Figure 4 is Figure 1 a partial enlarged view of the tensioning end in

[0058] Figure 5 It is a reference diagram of a use state of the present utility model.

[0059] The meanings of the codes in the figure: 1 - anchor; 1-1 - front anchor chamber; 1-2 - rear anchor chamber; 2 - embedded pipe; 21 - rear anchor end embedded plate; 22 - front anchor end embedded plate; 23 - rear anchor end spiral reinforcement; 24 - front anchor end spiral reinforcement; 25 - second air vent hole at the anchoring end; 26 - first air vent hole at the tensioning end; 3 - connecting flat plate; 31 - third air vent hole at the tensioning end; 4 - adjusting tie rod; 41 - rear end locking assembly; 42 - front end locking assembly; 5 - steel tie rod; 51 - first tie rod section; 52 - second tie rod section; 53 - anchoring end locking assembly; 531 - anchoring end spherical washer; 532 - anchoring end nut; 533 - first air vent hole at the anchoring end; 54 - tensioning end locking assembly; 541 - tensioning end spherical washer; 542 - tensioning end nut; 543 - fourth air vent hole at the tensioning end; 55 - connecting nut; 56 - first anti-loosening nut; 57 - second anti-loosening nut; 6 - anchoring end sealing cover; 7 - support cylinder; 71 - second air vent hole at the tensioning end; 8 - tensioning end sealing cover; 81 - exhaust port; 9 - anchor head; 10 - ventilation pipe; 11 - cable strand; 12 - annulus; 13 - pressure sensor; 131 - third air vent hole at the anchoring end; A - cable strand connection mechanism; B - prestressed anchoring mechanism. DETAILED DESCRIPTION OF THE INVENTION

[0060] The utility model relates to a suspension bridge main cable anchoring technology, specifically a steel rod anchoring system for the main cable anchoring of a suspension bridge. The main technical solution of the utility model is specifically described below in combination with multiple embodiments. Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 The technical solution of the utility model is clearly and in detail explained; although other embodiments are not separately drawn with drawings, their main structures can still refer to the drawings of embodiment 1.

[0061] It should be noted that the drawings of the present invention are schematic, and unnecessary details have been simplified to clarify the technical purpose of the present invention, so as to avoid blurring the technical solution of the present invention in the prior art. In addition, the expressions "approximately" and "substantially" in the following text regarding quantity or matching relationship mean that reasonable assembly errors and processing errors in the industry are allowed to exist, and do not literally express absolute quantity or matching relationship.

[0062] Example 1

[0063] See also Figure 1 , Figure 2 , Figure 3 , Figure 4 and Figure 5 As shown, the utility model is a steel rod anchoring system for anchoring the main cable of a suspension bridge, which includes a cable strand connecting mechanism A connecting the cable strands 11 and a prestressed anchoring mechanism B anchored in the anchor 1.

[0064] The cable strand connection mechanism A is mainly composed of two adjusting rods 4 and an anchor head 9. The anchor head 9 is used to anchor the corresponding cable strand 11 of the main cable, and through holes for the corresponding adjusting rods 4 are provided at both ends of the anchor head 9. The two adjusting rods 4 are correspondingly installed in the through holes of the anchor head 9, and the end of the adjusting rod 4 on the front side of the anchor head 9 is threadedly connected with a front locking assembly 42, including a washer, a nut, etc.; the end of the adjusting rod 4 on the rear side of the anchor head 9 is threadedly connected with a rear locking assembly 41, including a spherical washer, a nut, etc.

[0065] The prestressed anchoring mechanism B has a steel tie rod 5. The steel tie rod 1 is a spliced structure to meet the technical requirements of anchoring construction and is axially butt-jointed and combined by two tie rod segments. Specifically, the butt-jointed ends of the first tie rod segment 51 and the second tie rod segment 52 are commonly thread-connected into the same splicing nut 55, and a first locknut 56 for abutting and locking the splicing nut 55 is connected to the first tie rod segment 51, and a second locknut 57 for abutting and locking the splicing nut 55 is connected to the second tie rod segment 52. The splicing nut 55 and the first locknut 56 and the second locknut 57 constitute the maximum outer diameter part of the entire steel tie rod 5. The rear end of the steel tie rod 5 is used as the anchoring end and is thread-connected with an anchoring end locking assembly 53, including an anchoring end spherical washer 531, an anchoring end nut 532, etc.; the front end of the steel tie rod 5 is used as the tensioning end and is thread-connected with a tensioning end locking assembly 54, including a tensioning end spherical washer 541, a tensioning end nut 542, etc.

[0066] The above-mentioned strand connection mechanism A uses a connecting plate 3 as a transfer piece and is connected to the tensioning end of the above-mentioned prestressed anchoring mechanism B. Specifically, a perforation for the steel tie rod 5 of the prestressed anchoring mechanism B to pass through is formed in the middle area of the connecting plate 3, and perforations for the two adjusting tie rods 4 of the strand connection mechanism A to pass through are formed at both ends of the connecting plate 3. The two adjusting tie rods 4 of the strand connection mechanism A are correspondingly inserted into the perforations at both ends of the connecting plate 3 and are locked by a rear end locking assembly 41 at the rear side of the connecting plate 3 (the side facing the anchor block 1); the tensioning end of the steel tie rod 5 of the prestressed anchoring mechanism B is correspondingly inserted into the perforation in the middle of the connecting plate 3 and is locked by a tensioning end locking assembly 54 at the front side of the connecting plate 3 (the side opposite to the anchor block 1).

[0067] The above-mentioned prestressed anchoring mechanism B is anchored in the anchor block 1 according to the following structure.

[0068] Specifically, the anchor block 1 is used as the set position for anchoring the prestressed anchoring mechanism B, and a through rod channel is formed by embedding a through pipe 2 for the above-mentioned steel tie rod 5 to pass through. The embedded through pipe 2 is a steel pipe with an inner diameter larger than the maximum outer diameter of the above-mentioned steel tie rod 5 (i.e., the part at the splicing nut 55 and the first locknut 56 and the second locknut 57) and is embedded in the anchor block 1; the aforementioned anchor block 1 has a front anchor chamber 1-1 and a rear anchor chamber 1-2, and the front end of the through rod channel communicates with the front anchor chamber 1-1, and the rear end communicates with the rear anchor chamber 1-2. If the size of the steel pipe forming the embedded through pipe 2 is insufficient, at least two steel pipes can be axially fixedly butt-jointed and lengthened.

[0069] To ensure the anchoring and threading of the steel tie rod 5, a rear-anchor-end embedded plate 21 is fixedly connected to the rear-anchor end of the embedded pipe 2. The rear-anchor-end embedded plate 21 is embedded in the inner and outer surfaces of the anchor block 1 and is exposed at the rear-anchor chamber, serving as the anchoring abutment for the anchoring end of the steel tie rod 5 and the connection foundation for the following anchoring-end sealing cover 6. To ensure the threading of the steel tie rod 5, the inner hole size of the rear-anchor-end embedded plate 21 should be larger than the maximum outer diameter of the steel tie rod 5 (i.e., the parts at the extension nut 55, the first locknut 56, and the second locknut 57). A front-anchor-end embedded plate 22 is fixedly connected to the front-anchor end of the embedded pipe 2. The front-anchor-end embedded plate 22 is embedded in the inner and outer surfaces of the anchor block 1 and is exposed at the front-anchor chamber, serving as the tensioning abutment for the tensioning end of the steel tie rod 5 - that is, the connection foundation for the following support cylinder 7. To ensure the threading of the steel tie rod 5, the inner hole size of the front-anchor-end embedded plate 22 should be larger than the maximum outer diameter of the steel tie rod 5 (i.e., the parts at the extension nut 55, the first locknut 56, and the second locknut 57).

[0070] To ensure the firm anchoring of the embedded pipe 2 in the anchor block 1, an anchoring-end spiral bar 23 wound around the outer periphery of the embedded pipe 2 is connected to the inner side of the rear-anchor-end embedded plate 21, and a tensioning-end spiral bar 24 wound around the outer periphery of the embedded pipe 2 is connected to the inner side of the front-anchor-end embedded plate 22. The spiral bars are embedded in the anchor block 1.

[0071] The steel tie rod 5 of the prestressed anchoring mechanism B is threaded through the corresponding rod-passing channel in the anchor block 1 - that is, the embedded pipe 2. Under the tensioning positioning of the following anchoring-end structure and tensioning-end structure, an annular space 12 with a clearance fit is formed between the outer wall of the steel tie rod 5 and the inner wall of the corresponding embedded pipe 2.

[0072] At the rear-anchor end of the corresponding embedded pipe 2, an anchoring-end locking assembly 53 is connected to the anchoring end of the steel tie rod 5. As described above, the anchoring-end locking assembly 53 mainly consists of an anchoring-end spherical washer 531 and an anchoring-end nut 532. Under the locking force of the anchoring-end nut 532, the anchoring-end spherical washer 531 should abut against the rear-anchor-end embedded plate 21 at the rear-anchor end of the embedded pipe 2. However, in order to be able to dynamically monitor the mechanical properties of the steel tie rod 5 in a timely manner, a pressure sensor 13 is sleeved between the anchoring-end spherical washer 531 of the anchoring-end locking assembly 53 and the rear-anchor-end embedded plate 21, that is, the anchoring-end spherical washer 531 of the anchoring-end locking assembly 53 abuts against the rear-anchor-end embedded plate 21 through the pressure sensor 13. The pressure sensor 13 is used to dynamically collect the locking force of the anchoring-end locking assembly 53 and provide real-time feedback to the on-line monitoring controller.

[0073] The tension end of the steel tie rod 5 extends out of the front anchor end corresponding to the embedded pipe 2 and passes through to connect the flat plate 3 to connect the tension end locking assembly 54, that is, it is connected to the flat plate 3 through the tension end locking assembly 54. As described above, the tension end locking assembly 54 is mainly composed of a tension end spherical washer 541 and a tension end nut 542. Under the locking force of the tension end nut 542, the tension end spherical washer 541 abuts against the side of the flat plate 3 opposite to the anchor block 1. Of course, in order to ensure the tension of the steel tie rod 5, a support cylinder 7 is sleeved on the area where the steel tie rod 5 passes through the front anchor end of the embedded pipe 2. The rear end of the support cylinder 7 abuts and is fixed on the outer surface of the front anchor end embedded plate 22 of the embedded pipe 2, and the front end of the support cylinder 7 abuts and is fixed on the rear surface of the flat plate 3, making the flat plate 3 relatively far from the anchor block 1. Also, with the support cylinder 7 as the force transmission structure, prestress tension is applied to the steel tie rod 5 at the flat plate 3.

[0074] In the above-mentioned installation and anchoring structure of the steel tie rod 5, no bonding structure is formed between the steel tie rod 5 and the embedded pipe 2, but it is installed in a ring-shaped space structure. In order to reduce the corrosion of the steel tie rod 5 by erosion substances such as water vapor during service and delay the service durability, a drying and ventilation air duct is additionally provided in the installation structure of the above-mentioned steel tie rod 5.

[0075] Specifically, at the outer side of the rear anchor end embedded plate 21, an anchor end sealing cover 6 is fixedly connected, which can comprehensively enclose the anchor end of the steel tie rod 5, the anchor end locking assembly 53 and the pressure sensor 13. Under the enclosure of the anchor end sealing cover 6, the anchor end of the steel tie rod 5 passing through the embedded pipe 2 and related structures are not exposed. A ventilation pipe 10 is connected to the anchor end sealing cover 6, and the upstream end of the ventilation pipe 10 is connected to a dehumidifier arranged in the rear anchor chamber 1-2 of the anchor block 1, that is, the anchor end sealing cover 6 is connected to the dehumidifier arranged in the rear anchor chamber 1-2 through the ventilation pipe 10, and the dehumidifier blows air into the anchor end sealing cover 6 for dehumidification.

[0076] At the circumference of the above-mentioned spherical washer 531 at the anchoring end, there are provided at least one, usually a plurality of uniformly arranged circumferentially anchoring end ventilation holes I 533. A clearance fit is formed between the inner hole of the spherical washer 531 at the anchoring end and the steel tie rod 5, and this fit clearance also constitutes the anchoring end ventilation holes I 533. The outer ends of the respective anchoring end ventilation holes I 533 arranged circumferentially on the spherical washer 531 at the anchoring end are exposed within the anchoring end seal cover 6, thereby connecting the dehumidifier through the anchoring end seal cover 6 as an intermediary. The anchoring end ventilation holes I 533 formed by the clearance fit between the inner hole of the spherical washer 531 at the anchoring end and the steel tie rod 5 have their inner ends used for communicating with the annulus 12 between the above-mentioned steel tie rod 5 and the embedded through-pipe 2. Of course, due to the presence of the pressure sensor 13 and the rear anchoring end embedded plate 21, it should be indirectly connected rather than directly connected. The ventilation holes on the aforementioned spherical washer at the anchoring end can also be formed by obliquely opening, that is, the outer end is exposed within the anchoring end seal cover, and the inner end directly leads to the inner side surface near the inner hole without passing through the inner hole; it can also be formed by an L-shaped bent structure, that is, the outer end is exposed within the anchoring end seal cover, and the inner end is exposed at the inner side surface near the inner hole without passing through the inner hole; of course, the aforementioned ventilation hole structure passing through the inner hole is simpler and easier to implement, and does not affect the force on the spherical washer at the anchoring end. The formation of a plurality of ventilation holes circumferentially on the spherical washer at the anchoring end enables the dry air to enter through multiple strands and be basically uniform, which is beneficial to the uniform flow of the dry air on the surface of the steel tie rod.

[0077] The inner hole of the above-mentioned pressure sensor 13 is larger than the steel tie rod 5 passing through it. Therefore, a clearance fit is formed between the outer wall of the steel tie rod 5 passing through it and the inner hole of the pressure sensor 13 to form the anchoring end ventilation holes III 131. One end of the anchoring end ventilation holes III 131 communicates with the anchoring end ventilation holes I 533 at the spherical washer 531 at the anchoring end, and the other end of the anchoring end ventilation holes III 131 is used for communicating with the annulus 12 between the above-mentioned steel tie rod 5 and the embedded through-pipe 2. Of course, due to the presence of the rear anchoring end embedded plate 21, it should be indirectly connected rather than directly connected, that is, the other end of the anchoring end ventilation holes III 131 communicates with the anchoring end ventilation holes II 25 between the following steel tie rod 5 and the rear anchoring end embedded plate 21.

[0078] The inner hole of the above-mentioned rear anchoring end embedded plate 21 is larger than the steel tie rod 5 passing through it. Therefore, a clearance fit is formed between the outer wall of the steel tie rod 5 passing through it and the inner hole of the rear anchoring end embedded plate 21 to form the anchoring end ventilation holes II 25. The outer end of the anchoring end ventilation holes II 25 communicates with the anchoring end ventilation holes III 131 at the pressure sensor 13, and the inner end of the anchoring end ventilation holes II 25 communicates with the annulus 12 between the above-mentioned steel tie rod 5 and the embedded through-pipe 2.

[0079] Through the first anchorage end vent hole 533 at the spherical washer 531 of the anchorage end, the third anchorage end vent hole 131 at the pressure sensor 13, and the second anchorage end vent hole 25 at the rear anchorage end embedded plate 21, the inner cavity of the anchorage end seal cover 6 is communicated with the annulus 12 between the steel tie rod 5 and the embedded pipe 2, and the dry air output by the dehumidifier can blow and dehumidify from the anchorage end of the steel tie rod 5 to the tension end.

[0080] In order to discharge the dry air in the annulus 12 between the steel tie rod 5 and the embedded pipe 2, the dry ventilation airway also has the following tension end structure.

[0081] The inner hole of the front anchorage end embedded plate 22 is larger than the steel tie rod 5 passing through it. Therefore, a clearance fit tension end vent hole one 26 is formed between the outer wall of the steel tie rod 5 passing through it and the inner hole of the front anchorage end embedded plate 22. The inner end of the tension end vent hole one 26 communicates with the annulus 12 between the steel tie rod 5 and the embedded pipe 2, and the outer end of the tension end vent hole one 26 is used to discharge the gas in the annulus 12. Therefore, it should be communicated with the external environment on the front side of the anchor pier 1. Of course, due to the existence of the support cylinder 7, the connecting flat plate 3, the tension end locking assembly 54, and the tension end seal cover 8, it should be indirectly communicated, rather than directly communicated. Therefore, the outer end of the tension end vent hole one 26 is used to discharge the gas in the annulus 12 into the tension end vent hole two 71 between the steel tie rod 5 and the support cylinder 7 described below.

[0082] The inner hole of the support cylinder 7 is larger than the steel tie rod 5 passing through it. Therefore, a clearance fit tension end vent hole two 71 is formed between the outer wall of the steel tie rod 5 passing through it and the inner hole of the support cylinder 7. The inner end of the tension end vent hole two 71 communicates with the tension end vent hole one 26 at the front anchorage end embedded plate 22, and the outer end of the tension end vent hole two 71 is used to discharge the gas in the annulus 12 and is communicated with the tension end vent hole three 31 at the connecting flat plate 3 described below.

[0083] The inner hole of the connecting flat plate 3 is larger than the steel tie rod 5 passing through it. Therefore, a clearance fit tension end vent hole three 31 is formed between the outer wall of the steel tie rod 5 passing through it and the inner hole of the connecting flat plate 3. The inner end of the tension end vent hole three 31 communicates with the tension end vent hole two 71 at the support cylinder 7, and the outer end of the tension end vent hole three 31 is used to discharge the gas in the annulus 12 and is communicated with the tension end vent hole four 543 at the tension end spherical washer 541 described below.

[0084] At the circumference of the above-mentioned tensioning end spherical washer 541, there are provided at least one, usually a plurality of tensioning end vent holes 543 arranged evenly in the circumferential direction. A clearance fit is formed between the inner hole of the tensioning end spherical washer 541 and the steel tie rod 5, and this fit clearance also constitutes the tensioning end vent holes 543. The outer ends of the tensioning end vent holes 543 arranged in the circumferential direction of the tensioning end spherical washer 541 are exposed inside the following tensioning end seal cover 8, thereby connecting to the external environment through the tensioning end seal cover 8 as an intermediary. The inner ends of the tensioning end vent holes 543 formed by the clearance fit between the inner hole of the tensioning end spherical washer 541 and the steel tie rod 5 are used to communicate with the tensioning end vent holes 31 at the above-mentioned connecting flat plate 3. The vent holes on the aforementioned tensioning end spherical washer can also be formed by obliquely opening, that is, the outer end is exposed inside the tensioning end seal cover, and the inner end directly leads to the inner side surface near the inner hole without passing through the inner hole; it can also be formed by an L-shaped bending structure, that is, the outer end is exposed inside the tensioning end seal cover, and the inner end is exposed at the inner side surface near the inner hole without passing through the inner hole; of course, the aforementioned vent hole structure passing through the inner hole is simpler and easier to implement, and it does not affect the force on the tensioning end spherical washer. The formation of a plurality of vent holes in the circumference of the tensioning end spherical washer enables the dry air to be discharged in multiple strands and basically evenly, which is beneficial to the uniform flow of the dry air on the surface of the steel tie rod.

[0085] At the front side of the above-mentioned connecting flat plate 3, a tensioning end seal cover 8 is fixedly connected, which can comprehensively enclose the tensioning end of the steel tie rod 5 and the tensioning end locking assembly 54. Under the enclosure of the tensioning end seal cover 8, the tensioning end of the steel tie rod 5 passing through the connecting flat plate 3 and related structures are not exposed. The tensioning end seal cover 8 is used to collect the gas blown from the anchoring end, and the steel tie rod 5 is kept dry and integral through the above-mentioned dry air duct structure. An exhaust port 81 is provided on the tensioning end seal cover 8, and this exhaust port 81 is used to discharge the gas collected inside the tensioning end seal cover 8.

[0086] Through the tensioning end vent hole 1 26 at the above-mentioned front anchor end embedded plate 22, the tensioning end vent hole 2 71 at the support cylinder 7, the tensioning end vent hole 3 31 at the connecting flat plate 3, and the tensioning end vent hole 4 543 at the tensioning end spherical washer 541, the inner space of the tensioning end seal cover 8 is connected to the annulus 12 between the above-mentioned steel tie rod 5 and the embedded pipe 2, and the dry air for blowing and dehumidifying from the anchoring end to the tensioning end is discharged outside through the tensioning end seal cover 8.

[0087] When the steel tie rod of the steel tie rod anchoring system for the main cable of the above-mentioned suspension bridge is monitored to be damaged, or when it is technically judged that replacement is needed, it is replaced according to the replacement method of the following sequential steps:

[0088] Step 1. Through the strand connection mechanism A, first unload the anchoring of the strand 11 anchored by the old steel tie rod at the replacement position;

[0089] Of course, at this time, the bridge should be in a closed maintenance state;

[0090] Step 2. Disassemble the relative structures at the tension end of the old steel tie rod, including in sequence the tension end seal cover 8, the tension end locking assembly 54, the connecting flat plate 3, and the support cylinder 7;

[0091] Step 3. Disassemble the relative structures at the anchorage end of the old steel tie rod, including in sequence the anchorage end seal cover 6, the anchorage end locking assembly 53, and the pressure sensor 13;

[0092] Step 4. Lift out the old steel tie rod in Step 3 from the front anchor chamber 1-1 of the anchor block 1;

[0093] Step 5. Lift and install into the front anchor chamber 1-1 of the anchor block 1 a new steel tie rod that has been subjected to anti-corrosion treatment and replaces the old steel tie rod;

[0094] The anti-corrosion treatment of the new steel tie rod includes but is not limited to:

[0095] - Coat the bare rod surface and the threaded part with epoxy zinc-rich primer;

[0096] - After the splicing is completed, the steel tie rods at both ends of the splicing nut assembly are wound with grease tape or asphalt tape for conical transition, and polysulfide sealant is scraped. At the same time, high-strength fiberglass cloth is wound, two layers of polysulfide sealant are applied on the surface of the fiberglass cloth, and it is shaped smoothly;

[0097] Step 6. Conduct preliminary positioning on the installed new steel tie rod;

[0098] Assemble the pressure sensor 13 and the anchorage end locking assembly 53 in sequence at the anchorage end of the new steel tie rod;

[0099] Step 7. Assemble the support cylinder 7, the connecting flat plate 3, and the tension end locking assembly 54 in sequence at the tension end of the new steel tie rod;

[0100] Step 8. Conduct prestress tension adjustment on the new steel tie rod;

[0101] Usually, before the installation of the cable strand 11, the new steel tie rod is tensioned to 1.2 times the design load to reduce the influence of alternating loads on the new steel tie rod and reduce the fatigue of the new steel tie rod itself;

[0102] Step 9. Conduct anchorage loading of the corresponding cable strand 11 on the new steel tie rod through the cable strand connection mechanism A;

[0103] Step 10. Conduct anti-corrosion treatment on the relative structures at the anchorage end and the tension end of the new steel tie rod, including but not limited to:

[0104] - Apply polysulfide sealant for sealing between the embedded plate, washer, nut, and the external screw of the nut;

[0105] - Conduct degreasing and rust removal treatment on both ends of the exposed part of the screw;

[0106] - Grind the outer surfaces of the nut and washer, and then spray super wear-resistant epoxy paint.

[0107] Step 11. Assemble the anchorage end seal cover 6 at the anchorage end of the new steel tie rod, and assemble the tension end seal cover 8 at the tension end of the new steel tie rod.

[0108] Embodiment 2

[0109] The utility model relates to a steel tie rod anchoring system for the main cable anchorage of a suspension bridge, which comprises a strand connecting mechanism for connecting strands and a prestressed anchoring mechanism anchored in an anchor block.

[0110] Among them, the strand connecting mechanism mainly consists of two adjusting tie rods and an anchor head. The anchor head is used to anchor the corresponding strand of the main cable, and through holes for the adjusting tie rods to pass through are provided at both ends of the anchor head. The two adjusting tie rods are correspondingly inserted into the through holes of the anchor head, and the end of the adjusting tie rod on the front side of the anchor head is threadedly connected with a front-end locking assembly, including a washer, a nut, etc.; the end of the adjusting tie rod on the rear side of the anchor head is threadedly connected with a rear-end locking assembly, including a spherical washer, a nut, etc.

[0111] The prestressed anchoring mechanism has a steel tie rod. The steel tie rod is an extended structure to meet the technical requirements of anchoring construction, and is axially butt-jointed and combined by two tie rod segments. Specifically, the butt-jointed ends of tie rod segment one and tie rod segment two are commonly threadedly connected in the same extension nut, and a locking nut one for abutting and locking the extension nut is connected to tie rod segment one, and a locking nut two for abutting and locking the extension nut is connected to tie rod segment two. The extension nut and the locking nut one and the locking nut two constitute the largest outer diameter part of the entire steel tie rod. The rear end of the steel tie rod is used as the anchorage end and is threadedly connected with an anchorage end locking assembly, including an anchorage end spherical washer, an anchorage end nut, etc.; the front end of the steel tie rod is used as the tension end and is threadedly connected with a tension end locking assembly, including a tension end spherical washer, a tension end nut, etc.

[0112] The above-mentioned strand connecting mechanism uses a connecting plate as a transfer piece and is connected to the tension end of the above-mentioned prestressed anchoring mechanism. Specifically, a through hole for the steel tie rod of the prestressed anchoring mechanism to pass through is provided in the middle area of the connecting plate, through holes for the two adjusting tie rods of the strand connecting mechanism to pass through are provided at both ends of the connecting plate, the two adjusting tie rods of the strand connecting mechanism are correspondingly inserted into the through holes at both ends of the connecting plate, and are locked by the rear-end locking assembly at the rear side (towards the anchor block) of the connecting plate; the tension end of the steel tie rod of the prestressed anchoring mechanism is correspondingly inserted into the through hole in the middle of the connecting plate, and is locked by the tension end locking assembly at the front side (opposite to the anchor block) of the connecting plate.

[0113] The above-mentioned prestressed anchoring mechanism is anchored in the anchor block according to the following structure.

[0114] Specifically, the anchor block is used as the set position for anchoring the prestressed anchoring mechanism. A through-bar channel is formed by pre-burying a pipe, through which the above-mentioned steel tie rods are inserted. The pre-buried pipe is a steel pipe with an inner diameter larger than the maximum outer diameter of the above-mentioned steel tie rods (i.e., the parts at the splicing nut and the first and second anti-loosening nuts), and is pre-buried in the anchor block. The aforementioned anchor block has a front anchor chamber and a rear anchor chamber. The front end of the through-bar channel communicates with the front anchor chamber, and the rear end communicates with the rear anchor chamber. If the size of the steel pipe forming the pre-buried pipe is insufficient, at least two steel pipes can be axially fixed and butt-jointed for lengthening treatment.

[0115] To ensure the anchoring and insertion of the steel tie rods, a rear-anchor-end pre-buried plate is fixedly connected to the rear-anchor end of the pre-buried pipe. The rear-anchor-end pre-buried plate is pre-buried in the anchor block, and its inner and outer surfaces are exposed at the rear anchor chamber, serving as the anchoring abutment for the anchoring end of the steel tie rod and the connection foundation for the following anchoring-end sealing cover. To ensure the insertion of the steel tie rods, the inner hole size of the rear-anchor-end pre-buried plate should be larger than the maximum outer diameter of the steel tie rods (i.e., the parts at the splicing nut and the first and second anti-loosening nuts). A front-anchor-end pre-buried plate is fixedly connected to the front-anchor end of the pre-buried pipe. The front-anchor-end pre-buried plate is pre-buried in the anchor block, and its inner and outer surfaces are exposed at the front anchor chamber, serving as the tensioning abutment for the tensioning end of the steel tie rod - i.e., the connection foundation for the following support cylinder. To ensure the insertion of the steel tie rods, the inner hole size of the rear-anchor-end pre-buried plate should be larger than the maximum outer diameter of the steel tie rods (i.e., the parts at the splicing nut and the first and second anti-loosening nuts).

[0116] To ensure the firm anchoring of the pre-buried pipe in the anchor block, an anchoring-end spiral bar wound around the outer periphery of the pre-buried pipe is connected to the inner side of the rear-anchor-end pre-buried plate, and a tensioning-end spiral bar wound around the outer periphery of the pre-buried pipe is connected to the inner side of the front-anchor-end pre-buried plate, and the spiral bars are embedded in the anchor block.

[0117] The steel tie rods of the prestressed anchoring mechanism are inserted into the corresponding through-bar channels in the anchor block - i.e., the pre-buried pipes. Under the tensioning positioning of the following anchoring-end structure and tensioning-end structure, an annular space with clearance fit is formed between the outer wall of the steel tie rod and the inner wall of the corresponding pre-buried pipe.

[0118] The anchoring end of the steel tie rod is connected with an anchoring-end locking assembly at the rear-anchor end of the corresponding pre-buried pipe. As described above, the anchoring-end locking assembly is mainly composed of an anchoring-end spherical washer and an anchoring-end nut. Under the locking force of the anchoring-end nut, the anchoring-end spherical washer should abut against the rear-anchor-end pre-buried plate at the rear-anchor end of the pre-buried pipe. However, in order to be able to dynamically monitor the stress performance of the steel tie rod in a timely manner, a pressure sensor is sleeved between the anchoring-end spherical washer of the anchoring-end locking assembly and the rear-anchor-end pre-buried plate, that is, the anchoring-end spherical washer of the anchoring-end locking assembly abuts against the rear-anchor-end pre-buried plate through the pressure sensor. The pressure sensor is used to dynamically collect the locking force of the anchoring-end locking assembly and provide real-time feedback to the on-line monitoring controller.

[0119] The tension end of the steel tie rod extends out of the front anchor end corresponding to the embedded pipe, passes through the connecting flat plate and is connected to the tension end locking assembly, that is, it is connected to the connecting flat plate through the tension end locking assembly. As described above, the tension end locking assembly is mainly composed of a tension end spherical washer and a tension end nut. Under the locking force of the tension end nut, the tension end spherical washer abuts against the side of the connecting flat plate opposite to the anchor block. Of course, in order to ensure the tensioning of the steel tie rod, a support cylinder is sleeved on the area where the steel tie rod passes through the front anchor end of the embedded pipe. The rear end of the support cylinder abuts and is fixed on the outer surface of the front anchor plate of the embedded pipe, and the front end of the support cylinder abuts and is fixed on the rear surface of the connecting flat plate, making the connecting flat plate relatively far from the anchor block. Also, with the support cylinder as the force transmission structure, prestress tensioning of the steel tie rod is carried out at the connecting flat plate.

[0120] When the steel tie rod of the steel tie rod anchoring system for the main cable anchorage of the above-mentioned suspension bridge is monitored to be damaged, or when it is judged by technology that replacement is needed, it is replaced according to the replacement method of the following sequential steps:

[0121] Step 1. Through the strand connection mechanism, first carry out anchorage unloading on the strand anchored by the old steel tie rod at the replacement position;

[0122] Of course, at this time, the bridge should be in a closed maintenance state;

[0123] Step 2. Disassemble the relative structures at the tension end of the old steel tie rod, including in sequence the tension end locking assembly, the connecting flat plate and the support cylinder;

[0124] Step 3. Disassemble the relative structures at the anchorage end of the old steel tie rod, including in sequence the anchorage end locking assembly and the pressure sensor;

[0125] Step 4. Lift and extract the old steel tie rod in Step 3 from the front anchor chamber of the anchor block;

[0126] Step 5. Lift and install a new steel tie rod that has been anti-corrosion treated and replaces the old steel tie rod from the front anchor chamber of the anchor block;

[0127] The anti-corrosion treatment of the new steel tie rod includes but is not limited to:

[0128] - Coat the bare rod surface and the threaded part with epoxy zinc-rich primer;

[0129] - After the splicing is completed, the steel tie rods at both ends of the splicing nut assembly are wound with grease tape or asphalt tape for conical transition, and polysulfide sealant is scraped. At the same time, high-strength fiberglass cloth is wound, two layers of polysulfide sealant are applied on the surface of the fiberglass cloth, and it is shaped smoothly;

[0130] Step 6. Carry out preliminary positioning on the installed new steel tie rod;

[0131] Assemble the pressure sensor and the anchorage end locking assembly in sequence at the anchorage end of the new steel tie rod;

[0132] Step 7. Assemble a support cylinder, a connecting flat plate, and a tensioning end locking assembly in sequence at the tensioning end of the new steel tie rod.

[0133] Step 8. Adjust the prestress tension of the new steel tie rod.

[0134] Generally, before the installation of the cable strands, the new steel tie rod is tensioned to 1.2 times the design load to reduce the influence of alternating loads on the new steel tie rod and reduce the fatigue of the new steel tie rod itself.

[0135] Step 9. Anchor and load the corresponding cable strands on the new steel tie rod through the cable strand connection mechanism.

[0136] Step 10. Perform anti-corrosion treatment on the relative structures at the anchoring end and the tensioning end of the new steel tie rod, including but not limited to:

[0137] - Apply polysulfide sealant between the embedded plate, washer, nut, and the outer screw of the nut for sealing.

[0138] - Remove oil and rust from both ends of the exposed part of the screw rod.

[0139] - Grind the outer surfaces of the nut and the washer, and then spray super wear-resistant epoxy paint.

[0140] Example 3

[0141] Other contents of this example are the same as those of Example 1 or 2, except that:

[0142] Remove the pressure sensor at the anchoring end, and the stress performance of the steel tie rod is observed by manual inspection.

[0143] Example 4

[0144] Other contents of this example are the same as those of Example 1 or 2, except that:

[0145] When removing the old steel tie rod from the rod-passing channel of the anchor block, the steel tie rod is drawn out from the rear anchor chamber of the anchor block. Due to the limited space in the rear anchor chamber, one section of the steel tie rod is cut off as it emerges until the steel tie rod is completely removed from the corresponding rod-passing channel.

[0146] The above examples are only used to illustrate the present invention, rather than to limit it.

[0147] Although the present invention has been described in detail with reference to the above examples, those of ordinary skill in the art should understand that: they can still modify the above examples, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the present invention.

Claims

1. A steel tie rod anchoring system for anchoring a main cable of a suspension bridge, comprising a cable strand connecting mechanism (A) for connecting cable strands (11) and a prestressed anchoring mechanism (B) anchored in an anchor (1); The cable strand connection mechanism (A) is connected to the tensioning end of the prestressed anchor mechanism (B) via a connection plate (3); Features: The anchor (1) is provided with a rod-penetrating passage at a position for anchoring the prestressed anchor mechanism (B); The prestressed anchoring mechanism (B) comprises a steel tie rod (5), wherein the steel tie rod (5) is inserted into a corresponding rod-penetrating channel, wherein the anchoring end of the steel tie rod (5) is connected to an anchoring end locking assembly (53) at the rear anchoring end of the corresponding rod-penetrating channel, and the tensioning end of the steel tie rod (5) extends out of the corresponding rod-penetrating channel and is connected to the connecting plate (3) via the tensioning end locking assembly (54), and an annular space (12) with a clearance fit is formed between the outer wall of the steel tie rod (5) and the inner wall of the corresponding rod-penetrating channel.

2. The steel tie rod anchoring system for main cable anchoring of a suspension bridge according to claim 1, characterized in that: The anchor end locking assembly (53) is mainly composed of an anchor end spherical washer (531) and an anchor end nut (532). Under the locking force of the anchor end nut (532), the anchor end spherical washer (531) abuts against the rear anchor end of the rod penetration channel. The anchor end spherical washer (531) is provided with an anchor end vent hole 1 (533), the outer end of the anchor end vent hole 1 (533) is connected to the dehumidifier, and the inner end of the anchor end vent hole 1 (533) is connected to the annular space (12) between the steel tie rod (5) and the rod penetration channel; The dehumidifier is used to blow air and dehumidify from the anchoring end to the tensioning end of the steel tension rod (5).

3. The steel tie rod anchoring system for main cable anchoring of a suspension bridge according to claim 2, characterized in that: The rear anchor end of the rod-penetrating channel is connected to an anchor end sealing cover (6) that surrounds the anchor end of the steel pull rod (5) and the anchor end locking assembly (53); The anchor end sealing cover (6) is connected to the dehumidifier via a ventilation pipe (10), and the dehumidifier blows air into the anchor end sealing cover (6) to remove moisture.

4. The steel tie rod anchoring system for anchoring the main cable of a suspension bridge according to claim 3, characterized in that: The rod penetration channel is composed of a pre-buried penetration pipe (2) pre-buried in the anchor (1); The rear anchor end of the embedded through-tube (2) is connected to a rear anchor end embedded plate (21) embedded in the anchor (1); The steel tie rod (5) inserted into the embedded through-tube (2) passes through the rear anchor end embedded plate (21), and the anchor end locking assembly (53) connected to the anchor end of the steel tie rod (5) abuts against the rear anchor end embedded plate (21); An anchor end vent hole 2 (25) with a clearance fit is formed between the outer wall of the steel tie rod (5) and the inner hole of the rear anchor end embedded plate (21); the outer end of the anchor end vent hole 2 (25) is connected to the dehumidifier, and the inner end of the anchor end vent hole 2 (25) is connected to the annular space (12) between the steel tie rod (5) and the embedded through pipe (2).

5. The steel tie rod anchoring system for main cable anchoring of a suspension bridge according to claim 4, characterized in that: The locking butt top of the anchor end locking assembly (53) abuts against the rear anchor end embedded plate (21) via a pressure sensor (13); The pressure sensor (13) is used to dynamically collect the locking force of the anchor end locking assembly (53) and provide feedback to the online monitoring controller; The steel tie rod (5) inserted into the embedded through-tube (2) passes through the pressure sensor (13), and an anchor end vent hole three (131) with a clearance fit is formed between the outer wall of the steel tie rod (5) and the inner hole of the pressure sensor (13), one end of the anchor end vent hole three (131) is connected to the anchor end vent hole one (533) on the anchor end spherical washer (531), and the other end of the anchor end vent hole three (131) is connected to the anchor end vent hole two (25) between the steel tie rod (5) and the rear anchor end embedded plate (21).

6. The steel tie rod anchoring system for main cable anchoring of a suspension bridge according to claim 1 or 2, characterized in that: A support tube (7) is connected between the front anchor end of the rod-penetrating channel and the connecting plate (3); The steel pull rod (5) inserted into the rod-penetrating channel passes through the support tube (7) and the connecting plate (3); A tensioning end vent hole (71) with a clearance fit is formed between the outer wall of the steel tie rod (5) and the inner hole of the support tube (7), the inner end of the tensioning end vent hole (71) is connected to the annulus (12) between the steel tie rod (5) and the rod-penetrating channel, and the outer end of the tensioning end vent hole (71) is used to discharge the gas in the annulus (12); A tensioning end vent hole three (31) with a clearance fit is formed between the outer wall of the steel tie rod (5) and the inner hole of the connecting plate (3); the inner end of the tensioning end vent hole three (31) is connected to the tensioning end vent hole two (71) between the steel tie rod (5) and the supporting tube (7); the outer end of the tensioning end vent hole three (31) is used to discharge the gas in the annulus (12).

7. The steel tie rod anchoring system for anchoring the main cable of a suspension bridge according to claim 6, characterized in that: The tensioning end locking assembly (54) of the steel tie rod (5) at the connecting plate (3) is mainly composed of a tensioning end spherical washer (541) and a tensioning end nut (542). Under the locking force of the tensioning end nut (542), the tensioning end spherical washer (541) abuts against the connecting plate (3); The tensioning end spherical washer (541) is provided with a tensioning end vent hole four (543); The inner end of the tensioning end vent hole four (543) is connected to the tensioning end vent hole three (31) between the steel tie rod (5) and the connecting plate (3), and the outer end of the tensioning end vent hole four (543) is used to discharge the gas in the annulus (12).

8. The steel tie rod anchoring system for anchoring the main cable of a suspension bridge according to claim 7, characterized in that: A tensioning end sealing cover (8) that surrounds the tensioning end of the steel tension rod (5) and the tensioning end locking assembly (54) is connected to the connecting plate (3) on the side opposite to the rod penetration channel, and the tensioning end sealing cover (8) is used to collect the gas blown from the anchoring end; An exhaust port (81) is provided on the tensioning end sealing cover (8), and the exhaust port (81) is used to discharge gas in the tensioning end sealing cover (8).

9. The steel tie rod anchoring system for main cable anchoring of a suspension bridge according to claim 6, characterized in that: The rod penetration channel is composed of a pre-buried penetration pipe (2) pre-buried in the anchor (1); The front anchor end of the pre-buried through-tube (2) is connected to a front anchor end pre-buried plate (22) pre-buried in the anchor (1); The steel tie rod (5) inserted into the embedded through-tube (2) passes through the front anchor end embedded plate (22), and the support tube (7) inserted into the tensioning end of the steel tie rod (5) abuts against the front anchor end embedded plate (22); A tensioning end vent hole 1 (26) with a clearance fit is formed between the outer wall of the steel tie rod (5) and the inner hole of the front anchor end embedded plate (22); the inner end of the tensioning end vent hole 1 (26) is connected to the annulus (12) between the steel tie rod (5) and the embedded through-tube (2); the outer end of the tensioning end vent hole 1 (26) is used to discharge the gas in the annulus (12) to the tensioning end vent hole 2 (71) between the steel tie rod (5) and the support tube (7).

10. The steel tie rod anchoring system for main cable anchoring of a suspension bridge according to claim 1, characterized in that: The steel tie rod (5) is an extended structure, formed by at least two tie rod sections axially butted together; The butt ends of two adjacent sections of the pull rod section 1 (51) and the pull rod section 2 (52) are threadedly connected together in the same extension nut (55), and the pull rod section 1 (51) is connected to a lock nut 1 (56) for locking the extension nut (55), and the pull rod section 2 (52) is connected to a lock nut 2 (57) for locking the extension nut (55).

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