CN115125838A - A kind of connectable cable and construction method - Google Patents

Abstract

A connectable cable and a construction method, comprising a fixed-end anchor (1) and a tension-end anchor (2), characterized in that: the fixed-end anchor (1) and the fixed-end cable body (3) are connected The fixed end is fixed, the tension end anchor (2) is fixed with the fixed end of the tension end cable body (5), the connection end of the fixed end cable body (3) and the connection end of the tension end cable body (5) They are connected and fixed by one or more lengthable intermediate cable bodies (4), between the ends of adjacent intermediate cable bodies (4) and between the ends of the intermediate cable bodies (4) and the pulling end cable body (5). ) connection ends are connected and fixed through the intermediate joint (6), the present invention has a reasonable structure, adopts a lengthable structure, can flexibly adjust the length according to actual needs, can be easily connected and fixed at the construction site, and the connection is reliable. , The overall strength is high, and it is conducive to the installation of hanging baskets, which improves the construction efficiency, shortens the construction period, facilitates maintenance, and can effectively reduce maintenance costs.

Description

A kind of connectable cable and construction method

technical field

The invention relates to a cable and a construction method, in particular to a connectable long cable and a construction method, belonging to the technical field of bridge engineering.

Background technique

For a long time, the cable-stayed bridge needs to set up a hinged structure on the top of the pylon during the construction of the bridge truss, and start the construction from the pylon, pour or install the beam sections in sections, and extend out section by section. During the construction of each beam section, it is necessary to build a construction platform or a construction hanging basket device to facilitate the construction of formwork and other construction operations. It is necessary to install temporary cables to carry the construction platform or construction hanging basket. During construction, the construction platform or construction hanging Build the formwork on the basket, pour concrete, install the permanent cable while waiting for the concrete of the beam section to reach the curing strength. , to realize the system transformation of the force. After completing the construction of the beam body segment, loosen the hanging basket, move forward to the construction position of the next adjacent beam body segment, repeat the previous beam body segment construction, and so on to complete the beam body construction.

The existing cables are produced according to the fixed length in the factory. After leaving the factory, they are used according to the fixed length. The adjustment amount of the anchorage is short. When a longer or shorter cable is required, it can only be reproduced. longer, affecting the construction progress. In the actual use process, the length requirements of the cables are different for cable-stayed bridges with different spans and heights and different parts of the same cable-stayed bridge, and the existing cables cannot flexibly adjust the length according to actual needs. Inconvenient, this technical problem has not been effectively solved.

SUMMARY OF THE INVENTION

The first purpose of the present invention is that the cables used in the existing cable-stayed bridges are fixed-length structures, the length cannot be flexibly adjusted according to actual needs, the use is inconvenient, it is not conducive to the installation of hanging baskets, and the defects and deficiencies that affect the construction period , The patent of the present invention provides a reasonable structure, adopts a lengthable structure, can flexibly adjust the length according to actual needs, can be easily connected and fixed at the construction site, has reliable connection, high overall strength, and is conducive to the installation of hanging baskets , which can improve the construction efficiency and shorten the construction period.

The second object of the present invention is to provide a convenient installation method for the defects and shortcomings of the existing cable-stayed bridge front fulcrum hanging basket construction method that needs to continuously adjust the length of the cables, the cables cannot be flexibly adjusted according to actual needs, and the construction period is long. The cable-stayed bridge can be easily connected and fixed at the construction site by lengthening and fixing, the overall strength is high, the stability is good, and the construction period of the cable-stayed bridge can be shortened.

The third object of the present invention is that the existing external prestressed cable body is long, it is inconvenient to wear the cable during construction, and the construction period is long. At the same time, the length of the cable cannot be flexibly adjusted according to actual needs, and can only be replaced as a whole during maintenance and replacement. Defects and deficiencies, provide a convenient installation, can easily carry out segmented cable threading at the construction site, and can lengthen and fix the cables, which can shorten the construction period, and only need to replace part of the replacement when repairing and replacing. It is a construction method of external prestressed and connectable cables that can replace the whole cable and reduce the maintenance cost.

In order to achieve the above-mentioned first purpose of the invention, the technical solution of the present invention is: a connectable cable, including a fixed end anchor and a tension end anchor, characterized in that: the fixed end anchor and the fixed end cable The fixed end of the cable body is fixed, the anchorage of the tension end is fixed with the fixed end of the cable body of the tension end, and the connecting end of the cable body of the fixed end and the connecting end of the cable body of the tension end are connected by one or more lengths. The intermediate cable bodies are connected and fixed, and the connection between the connecting end of the fixed end cable body and the end of the intermediate cable body, between the ends of the intermediate cable body, and between the end of the intermediate cable body and the connecting end of the pulling end cable body pass through. The intermediate joint is connected and fixed.

Further, the fixed end anchor includes an anchor cup, a backing plate, a nut and an anchor sealing device, the fixed end of the fixed end cable body is fixed in the anchor cup, the backing plate and the nut are respectively installed on the anchor cup, and the outside of the anchor cup is An anchor sealing device is arranged on the fixed end cable body of the end.

Further, the tension end anchor includes an anchor cup, a backing plate, a nut and an anchor sealing device, the fixed end of the fixed end cable body is fixed in the anchor cup, and the backing plate and the nut are respectively installed on the anchor cup. An anchor sealing device is arranged on the fixed end cable body at the outer end, and epoxy or aluminum alloy anchors are arranged in the connection part of the anchor cup and the fixed end cable body.

Further, the fixed end cable body, the intermediate cable body or the tension end cable body adopts one or any two or more of parallel wire cables, steel strand cables, extruded cables, steel tie rods, steel wire ropes or carbon fiber cables. combination.

Further, the intermediate joint includes a joint sleeve, a joint tie rod, a joint cylinder and a joint plug, one end of the intermediate cable body is fixed with a joint sleeve, and one end of an adjacent intermediate cable body connected to it is fixed with a joint plug, and the joint is fixed. The sleeve is connected with one end of the joint pull rod, and the other end of the joint pull rod is connected with the joint plug through the joint barrel.

Further, the intermediate joint includes an anchor, an ear plate and a pin, one end of the fixed end cable body, the intermediate cable body or the tension end cable body is fixed with the anchor, and the anchor is connected with the ear plate through the pin.

Further, the intermediate joint includes an anchor, an ear plate, a fork lug and a fork lug pin, one end of the fixed end cable body, the intermediate cable body or the tension end cable body is fixed with the anchor, and the anchor is connected with the fork lug. The fork lug is connected with the lug plate through the fork lug pin shaft.

Further, the fixed end cable body, the intermediate cable body or the tension end cable body are made of steel strands as cable strands, and the steel strands are made of smooth steel strands, galvanized steel strands, galvanized aluminum steel Stranded wire or unbonded steel strand, and the outer surface of the cable strand is provided with a steel strand sheath or wrapping tape, and the outer surface of the cable body is provided with a double-layer outer sheath or wrapping tape.

In order to achieve the above-mentioned second purpose of the invention, the technical solution of the present invention is: a construction method for connecting a long cable, which is characterized by comprising the following steps:

a. First, install the fixed end anchorage and the fixed end cable body on the bridge tower;

b. One or more intermediate cable bodies are then connected in sequence through intermediate joints in a manner of lengthening;

c. Next, connect and fix the lowermost intermediate cable body with one end of the tension end cable body through the intermediate joint, and connect and fix the other end of the tension end cable body with the beam body segment through the tension end anchor;

d. From the bridge tower, install multiple cables that can be connected in sequence, and install hanging baskets to establish a temporary stress system during the construction stage, build templates on the hanging baskets, and pour concrete for the beam sections;

e. Each time the construction of a pouring beam body segment is completed, the hanging basket is moved forward in turn, and the construction of all beam bodies is completed by analogy;

f. While waiting for the concrete on the beam body segment to solidify, the installation and construction of the permanent cable are carried out, and the permanent cable is tensioned so that the permanent cable bears the weight of the beam body segment, realizes the conversion of the force system, and completes the construction.

In order to achieve the above-mentioned third purpose of the invention, the technical solution of the present invention is: a construction method for externally prestressed extendable cables, which is characterized by comprising the following steps:

a. First reserve or pre-embed the anchor box, and install one or more diverters;

b. The intermediate cable bodies are penetrated in sections into the steering gear, and the intermediate cable bodies are connected and fixed through the intermediate joints in turn to form a long cable;

c. Then install the anchor, and fix the long cable on the anchor;

d. Finally, the long cable is tensioned to complete the prestress tension.

A bridge cable construction method using connectable cables, which is characterized by comprising the following steps:

a. First, connect and fix one or more sections of intermediate cables on the bridge cables with insufficient actual length through intermediate joints in turn, or the entire bridge cables are connected and fixed by connectable cables;

b. Then install the anchor, and fix the bridge cable on the anchor;

c. Finally, tension the bridge cable to complete the installation of the connectable cable.

The beneficial effects of the present invention are:

1. The cable body of the present invention is composed of a fixed end cable body and a tension end cable body located at the end and a multi-section intermediate cable body located in the middle. The intermediate cable bodies are connected and fixed by intermediate joints. The cable body structure with the same performance as the fixed-length cable.

2. The invention adopts the intermediate joint to realize the connection between the connecting end of the fixed end cable body and the end of the intermediate cable body, between the ends of the intermediate cable body, and between the end of the intermediate cable body and the connecting end of the pulling end cable body The effective connection and fixation ensures the firmness of the connection and fixation between the cable bodies.

3. The invention improves the traditional construction method of the front fulcrum hanging basket, greatly facilitates construction by means of the connectable length cables, does not need to replace the cables frequently, can be connected and fixed on site, and is beneficial to the construction and acceptance of the pouring beam body segments. transformation of the force system. In addition, the external prestressed cable body can be easily threaded in sections at the construction site, and the cable can be lengthened and fixed, which can shorten the construction period, and when repairing and replacing, only a part of the cable needs to be replaced instead of the entire cable. All replacement, reducing maintenance costs.

4. The invention has a reasonable structure, adopts an extendable structure, can flexibly adjust the length according to actual needs, can be easily extended and fixed on the construction site, has reliable connection, high overall strength, and is conducive to the installation of hanging baskets and improves construction efficiency. , shorten the construction period.

Description of drawings

Figure 1 is a schematic structural diagram of the present invention.

Figure 2 is a schematic diagram of the structure of the present invention.

FIG. 3 is a schematic structural diagram of a fixed end anchor of the present invention.

FIG. 4 is a schematic structural diagram of the tension end anchor of the present invention.

FIG. 5 is a schematic structural diagram of the first embodiment of the intermediate joint of the present invention.

FIG. 6 is a schematic structural diagram of the second embodiment of the intermediate joint of the present invention.

Fig. 7 is a schematic structural diagram of the third embodiment of the intermediate joint of the present invention.

FIG. 8 is a schematic structural diagram of the first embodiment of the cable body of the present invention.

FIG. 9 is a schematic structural diagram of the second embodiment of the cable body of the present invention.

FIG. 10 is a schematic structural diagram of the third embodiment of the cable body of the present invention.

Figure 11 is a construction state diagram of the front fulcrum hanging basket of the present invention.

Fig. 12 is a construction state diagram of the external prestressed cable of the present invention.

Fig. 13 is a construction state view of the connectable cable of the present invention.

In the figure: fixed end anchorage 1, tensioned end anchorage 2, fixed end cable body 3, intermediate cable body 4, tensioned end cable body 5, intermediate joint 6, joint sleeve 7, joint tie rod 8, joint barrel 9, Joint plug 10, anchor 11, lug plate 12, pin 13, fork lug 14, fork lug pin 15, steel strand 16, steel strand sheath 17, outer sheath 18, high-strength polyester tape 19, winding Tape 20, anchor cup 21, backing plate 22, nut 23, anchor seal 24, bridge tower 25, permanent cable 26, beam body segment 27, hanging basket 28, diverter 29.

Detailed ways

The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

1 to 13 , a connectable cable of the present invention includes a fixed end anchor 1 and a tensioned end anchor 2, and is characterized in that: the fixed end anchor 1 and the fixed end cable body 3 are fixed The ends are fixed, the tension end anchor 2 is fixed with the fixed end of the tension end cable body 5, and the connection end of the fixed end cable body 3 and the connection end of the tension end cable body 5 can be connected by one or more sections. The intermediate cable bodies 4 are connected and fixed, between the connecting end of the fixed end cable body 3 and the end of the intermediate cable body 4, between the ends of the intermediate cable body 4, and between the end of the intermediate cable body 4 and the pulling end cable body The connection ends of 5 are connected and fixed through the intermediate joint 6 .

The fixed end anchor 1 includes an anchor cup 21, a backing plate 22, a nut 23 and an anchor sealing device 24. The fixed end of the fixed end cable body 3 is fixed in the anchor cup 21, and backing plates 22 are respectively installed on the anchor cups 21. And the nut 23, the fixed end cable body 3 at the outer end of the anchor cup 21 is provided with an anchor seal device 24.

The tension end anchor 2 includes an anchor cup 21, a backing plate 22, a nut 23 and an anchor sealing device 24, the fixed end of the fixed end cable body 3 is fixed in the anchor cup 21, and the backing plate is respectively installed on the anchor cup 21 22 and nut 23, the fixed end cable body 3 at the outer end of the anchor cup 21 is provided with an anchor sealing device 24, and the connection part in the anchor cup 21 with the fixed end cable body 3 is provided with an epoxy or aluminum alloy anchor.

The fixed end cable body 3, the intermediate cable body 4 or the tension end cable body 5 adopts one or any two or more of parallel wire cables, steel strand cables, extruded cables, steel tie rods, steel wire ropes or carbon fiber cables. combination.

The intermediate joint 6 includes a joint sleeve 7, a joint pull rod 8, a joint cylinder 9 and a joint plug 10. One end of the intermediate cable body 4 is fixed with a joint sleeve 7, and one end of an adjacent intermediate cable body 4 connected to it is fixed. There is a joint plug 10 , the joint sleeve 7 is connected with one end of the joint pull rod 8 , and the other end of the joint pull rod 8 is connected with the joint plug 10 through the joint cylinder 9 .

The intermediate joint 6 includes an anchor 11 , an ear plate 12 and a pin shaft 13 . One end of the fixed end cable body 3 , the intermediate cable body 4 or the tension end cable body 5 is fixed with the anchor device 11 , and the anchor device 11 passes through the pin shaft. 13 is connected to the ear plate 12 .

The intermediate joint 6 includes an anchor 11, an ear plate 12, a fork lug 14 and a fork lug pin 15, and one end of the fixed end cable body 3, the intermediate cable body 4 or the tension end cable body 5 is fixed with the anchor device 11, The anchor 11 is connected and fixed with the fork lug 14 , and the fork lug 14 is connected with the lug plate 12 through the fork lug pin shaft 15 .

The fixed end cable body 3, the intermediate cable body 4 or the tension end cable body 5 are made of steel strands 16 as cable strands, and the steel strands 16 are made of smooth steel strands, galvanized steel strands, galvanized steel strands, etc. Aluminum steel strand or unbonded steel strand, and the outer surface of the strand is provided with a steel strand sheath 17 or wrapping tape, and the outer surface of the cable body is provided with a double outer sheath 18 or wrapping tape 20 .

A construction method for a connectable cable, characterized by comprising the following steps:

a. First, install the fixed end anchorage 1 and the fixed end cable body 3 on the bridge tower 25;

b. One or more intermediate cable bodies 4 are subsequently extended in sequence through the intermediate joint 6;

c. Next, connect and fix the lowermost intermediate cable body 4 with one end of the tension end cable body 5 through the intermediate joint 6, and connect the other end of the tension end cable body 5 to the beam body segment 27 through the tension end anchor 2 connect and fix;

d, from the bridge tower 25, install a plurality of cables that can be connected in sequence, and install the hanging basket 28 to establish a temporary stress system in the construction stage, build a template on the hanging basket 28, and pour the concrete of the beam body segment 27;

e. Move the hanging basket 28 forward in turn every time the construction of a casted beam body segment 27 is completed, and so on to complete the construction of all the beam bodies;

f. While waiting for the concrete on the beam body section 27 to solidify, the installation and construction of the permanent cable 26 is carried out, and the permanent cable 26 is tensioned, so that the permanent cable 26 bears the weight of the beam body section 27, and the conversion of the force-bearing system is realized. construction.

A construction method for externally prestressed connectable cables, characterized by comprising the following steps:

a. First reserve or pre-embed the anchor box, and install one or more diverters 29;

b. Insert the intermediate cable bodies 4 into the diverter 29 in sections, and connect and fix the intermediate cable bodies 4 through the intermediate joints 6 in turn to form a long cable;

c. Then install the anchor, and fix the long cable on the anchor;

d. Finally, the long cable is tensioned to complete the prestress tension.

A bridge cable construction method using connectable cables, which is characterized by comprising the following steps:

a. First, connect and fix one or more sections of intermediate cable bodies 4 on the bridge cables with insufficient actual length through the intermediate joints 6 in turn, or the entire bridge cables are connected and fixed by connectable cables;

b. Then install the anchor, and fix the bridge cable on the anchor;

c. Finally, tension the bridge cable to complete the installation of the connectable cable.

Referring to the accompanying drawings in the description, the present invention is different from the traditional integral cable in that it adopts an extendable cable that can be connected and lengthened according to actual needs, and can be lengthened to the required length on the construction site as required. The cable body part of the present invention mainly includes a single fixed end cable body 3 at one end, one or more intermediate cable bodies 4 at the middle, and a single tension end cable body 5 at the other end, which can be connected as required. The long part is mainly reflected in the intermediate cable body 4, which adopts a multi-section structure, and the length of each intermediate cable body 4 is not more than 1000 meters.

The fixed end cable body 3, the intermediate cable body 4 or the tension end cable body 5 can adopt one or more of the cable structures such as parallel wire cables, steel strand cables, extruded cables, steel tie rods, steel wire ropes or carbon fiber cables. The outer surface of the cable body adopts protective or protective measures. The specific protective or anti-corrosion structure can be a plastic pipe, a hot-extruded plastic pipe or a metal pipe. The plastic pipe is not limited to HDPE, PE, PP, PE. The cable strands are made of smooth steel strands, galvanized steel strands, galvanized aluminum steel strands, unbonded steel strands or other types of strands. Specifically, one or a combination of any two or more of epoxy resin, galvanized or galvanized aluminum, high vanadium plating, anti-corrosion grease or anti-corrosion wax can be used. In addition, the outer surface of the cable strand is provided with a steel strand sheath 17 or a wrapping tape, and the outer surface of the cable body is provided with a single-layer outer sheath, a double-layer outer sheath 18 or a wrapping tape 20, which can also be wrapped around High-strength polyester tape 19.

The fixed end of the fixed end cable body 3 is fixed with the fixed end anchor 1. The fixed end anchor 1 can adopt various structural forms. A typical fixed end anchor 1 includes an anchor cup 21, a backing plate 22, a nut 23 and an anchor. The sealing device 24, the fixed end of the fixed end cable body 3 is fixed in the anchor cup 21, the backing plate 22 and the nut 23 are respectively installed on the anchor cup 21, and the fixed end cable body 3 at the outer end of the anchor cup 21 is provided with an anchor sealing device twenty four. One or more combinations of clip-type anchoring, epoxy mortar type, extrusion type, and pouring alloy fixing methods may be adopted between the fixed end cable body 3 and the fixed end cable body 3 .

The fixed end of the tension end cable body 5 is fixed with the tension end anchor 2. The tension end anchor 2 can adopt various structural forms. A typical tension end anchor 2 includes an anchor cup 21, a backing plate 22, and a nut. 23 and the anchoring device sealing device 24, the fixed end of the fixed end cable body 3 is fixed in the anchor cup 21, the anchor cup 21 is respectively installed with a backing plate 22 and a nut 23, and the fixed end cable body 3 at the outer end of the anchor cup 21 is provided with a The anchoring device sealing device 24 and the connection part of the anchor cup 21 and the fixed end cable body 3 are provided with epoxy or aluminum alloy anchors.

The connection end of the cable body 3 at the fixed end and the connection end of the cable body 5 at the tension end are connected and fixed by one or more lengths of intermediate cable bodies 4 . Between the connecting end of the fixed end cable body 3 and the end of the intermediate cable body 4, between the ends of the intermediate cable body 4 and between the end of the intermediate cable body 4 and the connecting end of the pulling end cable body 5 all pass through the middle. The joint 6 is connected and fixed, and the intermediate joint 6 ensures the firmness of the connection and fixation between the cable bodies. The intermediate joint 6 can adopt various structural forms, mainly including the following embodiments:

Example 1: The intermediate joint 6 includes a joint sleeve 7, a joint pull rod 8, a joint cylinder 9 and a joint plug 10. One end of the intermediate cable body 4 is fixed with the joint sleeve 7, and the adjacent intermediate cable body 4 connected to it has a joint sleeve 7. One end is fixed with a joint plug 10 , the joint sleeve 7 is connected with one end of the joint pull rod 8 , and the other end of the joint pull rod 8 is connected with the joint plug 10 through the joint cylinder 9 .

Example 2: The intermediate joint 6 includes an anchor 11, an ear plate 12 and a pin shaft 13, one end of the fixed end cable body 3, the intermediate cable body 4 or the tension end cable body 5 is fixed with the anchor tool 11, and the end cable body 5 One end of the anchoring device 11 forms a bifurcation to improve the anchoring strength, and the anchoring device 11 is connected with the ear plate 12 through the pin shaft 13 .

Embodiment 3: The intermediate joint 6 includes the anchor 11, the lug plate 12, the fork lug 14 and the fork lug pin 15, and one end of the fixed end cable body 3, the intermediate cable body 4 or the tension end cable body 5 is connected to the anchor device 11. For fixing, one end of the end cable body 5 forms a bifurcation in the anchor 11 to improve the anchoring strength. The anchor 11 is connected and fixed with the fork lug 14, and the fork lug 14 is connected with the lug plate 12 through the fork lug pin 15.

The construction steps and method of the hanging basket construction at the front fulcrum of the cable-stayed bridge of the present invention that can be connected with long cables are as follows: firstly, the fixed end anchorage 1 and the fixed end cable body 3 are installed on the bridge tower 25, and then the intermediate joints 6 are successively connected in a way of lengthening. One or more intermediate cable bodies 4 . From the bridge tower 25, install a plurality of cables that can be connected in sequence, and install the hanging basket 28 to establish a temporary stress system during the construction stage, build a formwork on the hanging basket 28, and pour the concrete of the beam body section 27. For the construction of section 27, the hanging basket 28 is moved forward in turn, and so on to complete the construction of all beam bodies. While waiting for the concrete on the beam body segment 27 to solidify, the installation and construction of the permanent cable 26 is carried out, and the permanent cable 26 is tensioned so that the permanent cable 26 bears the weight of the beam body segment 27, realizing the conversion of the force system and completing the construction.

The construction steps and methods of the construction method for connecting a long cable of the present invention are as follows: first, reserve or pre-embed the installation anchor box, and install one or more diverters 29, and then penetrate the intermediate cable body 4 into the diverter 29 in sections, And successively connect and fix each intermediate cable body 4 through the intermediate joint 6 to form a long cable. It is also possible to fix and connect the fixed end anchorage 1 at one end of the long cable, and install and fix the tension end anchorage at the other end of the long cable. 2, then install the anchor and fix the long cable on the anchor. Finally, the long cable is tensioned to complete the prestress tension.

The construction method of the bridge cable that adopts the present invention to connect the long cable is as follows: first, connect and fix one or more sections of intermediate cable bodies 4 on the bridge cable whose actual length is not enough through the intermediate joint 6, or the entire bridge cable adopts the connectable cable. Long cables are connected and fixed. Then install the anchor and fix the bridge cable on the anchor. Finally, the bridge cables are tensioned to complete the installation of the connectable cables. This method is also applicable to bridge engineering such as arch bridge cables and suspension bridge suspension cables.

The above content is a further detailed description of the present invention in conjunction with the specific embodiments, and it should not be considered that the specific implementation of the present invention is limited to these descriptions. Hereinafter, any simple modifications and substitutions made should be regarded as belonging to the protection scope of the present invention.

Claims (10)

1. An extendable cable, comprising a fixed end anchor (1) and a tension end anchor (2), characterized in that: the fixed end anchor (1) and the fixed end cable body (3) are fixed The ends are fixed, the tension end anchor (2) is fixed with the fixed end of the tension end cable body (5), and the connection end of the fixed end cable body (3) is connected with the connection end of the tension end cable body (5). The cables are connected and fixed by one or more lengthable intermediate cable bodies (4). Between the parts and between the end of the intermediate cable body (4) and the connection end of the pulling end cable body (5), the intermediate joint (6) is used for connection and fixation. 2 . The extendable cable according to claim 1 , wherein the fixed end anchor ( 1 ) comprises an anchor cup ( 21 ), a backing plate ( 22 ), a nut ( 23 ) and an anchor seal. 3 . The device (24), the fixed end of the fixed end cable body (3) is fixed in the anchor cup (21), the anchor cup (21) is respectively installed with a backing plate (22) and a nut (23), outside the anchor cup (21) An anchor sealing device (24) is arranged on the fixed end cable body (3) of the end. 3. The extendable cable according to claim 1, characterized in that: the tension end anchor (2) comprises an anchor cup (21), a backing plate (22), a nut (23) and an anchor The sealing device (24), the fixed end of the fixed end cable body (3) is fixed in the anchor cup (21), and the anchor cup (21) is respectively provided with a backing plate (22) and a nut (23), and the anchor cup (21) An anchoring device sealing device (24) is arranged on the fixed end cable body (3) at the outer end, and epoxy or aluminum alloy anchors are arranged in the connection part of the anchor cup (21) with the fixed end cable body (3). 4. A connectable cable according to claim 2, characterized in that: the fixed end cable body (3), the intermediate cable body (4) or the tension end cable body (5) are made of parallel wire cables, One or a combination of any two or more of steel strand cables, extruded cables, steel tie rods, steel wire ropes or carbon fiber cables. 5. The extendable cable according to claim 1, wherein the intermediate joint (6) comprises a joint sleeve (7), a joint pull rod (8), a joint barrel (9) and a joint plug (10) ), one end of the intermediate cable body (4) is fixed with a joint sleeve (7), and one end of an adjacent intermediate cable body (4) connected to it is fixed with a joint plug (10), the joint sleeve (7) and the joint One end of the pull rod (8) is connected, and the other end of the joint pull rod (8) is connected with the joint plug (10) through the joint cylinder (9). 6 . The extendable cable according to claim 1 , wherein the intermediate joint ( 6 ) comprises an anchor ( 11 ), an ear plate ( 12 ) and a pin shaft ( 13 ), and the fixed end cable body (3) One end of the intermediate cable body (4) or the tension end cable body (5) is fixed with the anchor (11), and the anchor (11) is connected with the ear plate (12) through the pin (13). 7 . The extendable cable according to claim 1 , wherein the fixed end cable body ( 3 ), the intermediate cable body ( 4 ) or the tension end cable body ( 5 ) are made of steel strands ( 7 . 16) Made for cable strands, the steel strands (16) are made of smooth steel strands, galvanized steel strands, galvanized aluminum steel strands or unbonded steel strands, and the outer surfaces of the strands are provided with The steel strand sheath (17) or the wrapping tape is provided, and the outer surface of the cable body is provided with a double outer sheath (18) or the wrapping tape (20). 8. A construction method for a connectable cable, characterized in that it comprises the following steps: a. First, install the fixed end anchorage (1) and the fixed end cable body (3) on the bridge tower (25); b. One or more intermediate cable bodies (4) are then connected in turn through the intermediate joint (6) in a manner of lengthening; c. Next, connect and fix the lowermost intermediate cable body (4) with one end of the tension end cable body (5) through the intermediate joint (6), and connect the other end of the tension end cable body (5) through tensioning The end anchor (2) is connected and fixed with the beam body segment (27); d. From the bridge tower (25), install a plurality of cables that can be connected in sequence, and install the hanging basket (28) to establish a temporary stress system during the construction stage, build a template on the hanging basket (28), and pour the beam body segment (28). 27) concrete; e. Move the hanging basket (28) forward in turn every time the construction of a casted beam body segment (27) is completed, and so on to complete the construction of all the beam bodies; f. While waiting for the concrete on the beam body segment (27) to solidify, carry out the installation and construction of the permanent cable (26), and tension the permanent cable (26) so that the permanent cable (26) bears the weight of the beam body segment (27). , to realize the conversion of the force system and complete the construction. 9. A construction method for externally prestressed connectable cables, characterized by comprising the following steps: a. First reserve or pre-embed the anchor box, and install one or more diverters (29); b. The intermediate cable bodies (4) are penetrated into the diverter (29) in sections, and the intermediate cable bodies (4) are connected and fixed through the intermediate joints (6) in turn to form a long cable; c. Then install the anchor, and fix the long cable on the anchor; d. Finally, the long cable is tensioned to complete the prestress tension. 10. A method for constructing a bridge cable that can be connected with a long cable, characterized in that it comprises the following steps: a. First, connect and fix one or more sections of intermediate cable bodies (4) on the bridge cables with insufficient actual length through the intermediate joints (6) in turn, or the entire bridge cables are connected and fixed by using extendable cables; b. Then install the anchor, and fix the bridge cable on the anchor; c. Finally, tension the bridge cable to complete the installation of the connectable cable.

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