Self-balancing device for preventing cable from sliding down in tensioning process of ultra-long longitudinal cable and construction method

Abstract

The invention provides a self-balancing device for preventing a cable from sliding off in the tensioning process of a super-long longitudinal cable and a construction method, the rear part of an extension rod is anchored through a temporary anchoring mechanism, and the rear end of the extension rod penetrates through the temporary anchoring mechanism and is pulled by a center hole type tensioning jack; the extension rod is further sleeved with an auxiliary traction mechanism in a fastening mode, and the front end of the auxiliary traction mechanism is connected to the cable body protection sleeve. The rear end of the auxiliary traction mechanism is connected to the temporary anchoring mechanism; the stay cable is further sleeved with an annular anti-clamping-falling buffer, the stay cable can move in the annular anti-clamping-falling buffer in the axial direction, and the outer side of the annular anti-clamping-falling buffer is detachably installed at the position, close to the cable inlet end, in the cable guide pipe. The invention aims to ensure the safety of the tensioning end of the stay cable in the initial tensioning process close to the bridge tower, prolong the service life of the extension rod, solve the risk that the rigid extension rod is easy to break or unstable in connection with the anchor cup to cause the falling of the stay cable, and ensure the safety and stability of the stay cable in the tensioning process.

Description

Technical Field

[0001] The invention belongs to the technical field of bridges, relates to cable-stayed bridges, and particularly relates to an anti-cable-sliding self-balancing device and a construction method during the tensioning process of ultra-long longitudinal cables. Background Art

[0002] In bridge construction, cable-stayed bridges, as one of the important forms of modern long-span bridges, have developed rapidly. The cable-stayed cable is a key process in the construction of cable-stayed bridges, and its manufacturing, installation, tensioning, cable force adjustment and other processes are complex. The tensioning construction of its cable-stayed cable is the core link that determines the structural safety and service performance. During the initial tensioning process of the cable-stayed cable, due to the small initial tension, the anchor head stays in the cable duct, while too large initial tension may cause the risk of local warping of the bridge deck. This influence usually makes it difficult to anchor the tensioning end of the cable-stayed cable or exacerbates the local warping of the bridge deck, changes the prestress distribution of the main girder, resulting in abnormal construction or even certain safety hazards.

[0003] In cable-stayed bridges, the cable-stayed cables are usually installed and assisted in fixing by means of soft traction with extension rods. The advantages of this method are that the number of steel strands and the traction force are adjustable; the steel strands are bendable, with small length limitations and relatively less affected by space; ordinary jacks or continuous jacks can be used. However, due to the complex construction in the anchorage area, the alignment device only measures the matching of vertical steel bars and ignores the alignment of the cable duct angle, resulting in a kink in the cable duct. And the extension rod is prone to sudden breakage due to its rigidity or fatigue fracture due to long-term use or uneven stress. Once the extension rod breaks, the cable-stayed cable may lose the tension force, resulting in the cable-stayed cable falling off or becoming slack, causing construction safety problems, affecting the construction progress, and wasting human and material resources, which is particularly obvious in long-span cable-stayed bridges.

[0004] To sum up, the construction method adopted for the tensioning end of the cable-stayed cable has certain risks and cannot guarantee the safety, economy, simplicity and other characteristics during the initial tensioning construction process of the cable-stayed cable. Therefore, how to solve the problem that the tensioning end of the cable-stayed cable is prone to falling off during the construction process is a technology urgently needed to be solved in cable-stayed bridges. Summary of the Invention

[0005] Aiming at the deficiencies of the existing technology, the purpose of the present invention is to provide an anti-cable-sliding self-balancing device and a construction method during the tensioning process of ultra-long longitudinal cables, so as to solve the technical problem that the safety and stability of the existing tensioning construction method need to be further improved.

[0006] To solve the above technical problems, the present invention adopts the following technical solutions to achieve:

[0007] An anti-cable-sliding self-balancing device during the tensioning process of an extra-long longitudinal cable. The device includes a stay cable, an anchor cup is arranged at the rear end of the stay cable, and a cable body protection sleeve fixedly connected to the stay cable and the anchor cup is also arranged at the rear part of the stay cable; the rear end of the anchor cup is detachably connected to the front end of an extension rod, the rear part of the extension rod is anchored by a temporary anchoring mechanism, and the rear end of the extension rod passes through the temporary anchoring mechanism and is pulled by a through-type tensioning jack;

[0008] An auxiliary traction mechanism is also tightly sleeved on the extension rod, and the front end of the auxiliary traction mechanism is connected to the cable body protection sleeve; the rear end of the auxiliary traction mechanism is connected to the temporary anchoring mechanism.

[0009] A ring-shaped anti-catching and falling buffer is also sleeved on the stay cable. The stay cable can axially move within the ring-shaped anti-catching and falling buffer, and the outside of the ring-shaped anti-catching and falling buffer is detachably installed at a position close to the cable inlet end in the cable duct.

[0010] It also includes a bridge tower. A plurality of reserved holes are provided on the bridge tower, a cable duct is installed in the reserved holes, a support surface is arranged on the bridge tower at the cable outlet end of the reserved holes, the through-type tensioning jack is installed on the top surface of a jack support frame, the bottom of the jack support frame is open and abuts against the support surface, and the extension rod passes through a central through-hole on the top surface of the jack support frame and is pulled by the through-type tensioning jack; the temporary anchoring mechanism is located within the jack support frame.

[0011] The present invention also protects an extra-long longitudinal cable tensioning construction method, which uses the anti-cable-sliding self-balancing device during the tensioning process of an extra-long longitudinal cable as described above.

[0012] Compared with the prior art, the present invention has the following technical effects:

[0013] (Ⅰ) The present invention aims to ensure the safety of the tensioning end of the stay cable during the initial tensioning process near the bridge tower, extend the service life of the extension rod, and solve the risk of stay cable shedding caused by the easy breakage of the rigid extension rod or the unstable connection with the anchor cup, ensuring the safety and stability of the stay cable during the tensioning process, preventing the stay cable from shedding, and providing a reliable technical guarantee for the construction of extra-long longitudinal cables.

[0014] (Ⅱ) The stay cable of the present invention enters the cable duct through traction and positioning. During the installation process, due to the small initial tension, the anchor cup cannot reach the designated anchoring point at one time. The present invention designs a ring-shaped anti-catching and falling buffer component, which is arranged at the bottom of the cable duct, preventing the stay cable from shedding while ensuring the upward movement of the stay cable along the duct, providing a stable support and guiding environment for the stay cable, and avoiding problems such as jamming or shedding of the stay cable due to insufficient tension.

[0015] (III) The extension rod of the present invention is connected to the anchor head part of the inclined cable by a detachable threaded connection, which is convenient for installation and disassembly. Its cross-sectional shape fits tightly with the inner wall to prevent relative sliding during the tensioning process. A transfer constraint ring is arranged on the upper side of the cable body anchor cup, and an anchor ring is arranged on the outer side, which further ensures the connectivity between the cable body and the extension rod and avoids the cable body from slipping due to connection problems. At the same time, the present invention changes the traditional auxiliary soft traction method from the inside of the extension rod to the outside of the extension rod, and installs a fixed constraint ring at the upper exit of the extension rod near the cable guide tube. On the basis of ensuring smooth traction, it reduces the impact of the docking rod during traction and improves its stability and strength.

[0016] (IV) The anti-cable slip self-balancing device of the present invention is based on the connection between the original extension rod and the anchor cup, and further connects the cable body to the transfer constraint ring through a rigid pull rod, and connects the transfer constraint ring, the fixed constraint ring and the extension rod into one by a traction pull rod. Finally, the whole is anchored on the temporary circular transfer ingot by a fixing nut to form a complete system with multiple components connected. The device uses the anchoring reaction force and the friction force of the cable guide tube to provide a balancing torque opposite to the sliding direction of the cable body. When the cable body structure is disturbed by the outside world and slips, the device can effectively prevent the cable body from falling off, and automatically restore it to a balanced state to form a self-balancing system. This design can effectively resist external interference torque, ensure the stability and safety of the structure, reduce structural damage and safety risks caused by the unbalanced state, and thus extend the service life of the structure.

[0017] (V) In the auxiliary traction mechanism of the present invention, the rigid pull rod can provide additional lateral support and connection for the inclined cable structure, improve the overall rigidity and stability of the cable body, and reduce damage to the cable body during traction. The traction pull rod is a relatively flexible cable structure that can effectively resist large unbalanced forces, bear important mechanical effects, and provide key support for the stability of the entire structure.

[0018] (VI) The present invention takes into account that the anchor itself is large in size and the space for the cable tensioning is designed to be relatively narrow, so it is difficult to set up a temporary anchoring mechanism for the extension rod separately. The present invention sets the anchoring system of the extension rod at the base of the tensioning equipment, and uses the structural strength and stability of the base to provide a reliable anchoring point for the extension rod. At the same time, by integrating the anchoring system with the base of the tensioning equipment, the space occupied by the additional temporary anchoring mechanism and the installation and disassembly steps during the construction process are greatly reduced, making the entire tensioning operation area more compact and adapting to the construction needs in a small space.

[0019] (VII) The present invention has a simple structure and is easy to operate. It can be easily promoted and applied in the construction of cable-stayed bridges of different sizes and types. At the same time, the present invention can save the steps of repeated adjustment and re-tensioning due to the detachment of the anchor head in traditional construction, thereby reducing construction time and manpower investment. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the self-balancing device for preventing the cable from slipping during the tensioning of the super-long longitudinal cable.

[0021] Figure 2 Schematic diagram of the tower end hanging cable structure of the self-balancing device for preventing the cable from slipping during the tensioning of the extra-long longitudinal cable.

[0022] Figure 3 It is a schematic diagram of the overall structure of the temporary anchoring mechanism.

[0023] Figure 4 It is a structural schematic diagram of the temporary anchoring mechanism during the tensioning process.

[0024] Figure 5 This is a schematic diagram of the structure of the temporary anchoring mechanism at the end of tensioning.

[0025] Figure 6 It is a schematic diagram of the overall structure of the auxiliary traction mechanism.

[0026] Figure 7 It is a schematic diagram of the connection relationship between the auxiliary traction mechanism and the cable body protective cover.

[0027] Figure 8 It is a schematic diagram of the overall structure of the annular anti-stuck and fall-proof buffer.

[0028] Figure 9 It is a schematic diagram of the structure of the set of annular anti-stuck buffer and inclined cable.

[0029] Figure 10 Schematic diagram of the construction principle of super-long longitudinal cable tensioning.

[0030] The meanings of the numbers in the figure are: 1-stayed cable, 2-anchor cup, 3-cable body protection cover, 4-extension rod, 5-temporary anchoring mechanism, 6-through-type tensioning jack, 7-auxiliary traction mechanism, 8-annular anti-stuck buffer, 9-cable guide tube, 10-bridge tower, 11-reserved channel, 12-support surface, 13-jack support frame, 14-center through hole, 15-tower top winch, 16-soft traction jack.

[0031] 501-round transfer ingot, 502-locking sleeve, 503-anchoring sleeve, 504-anchoring hole, 505-anchor plate.

[0032] 701-adapting restraint ring, 702-fixing restraint ring, 703-adjusting nut, 701-locking nut, 705-rigid pull rod, 706-anchoring ring, 707-traction pull rod, 708-fixing nut.

[0033] 70101-adapter restraint half ring, 70102-adapter seat, 70103-rigid pull rod adaptor hole, 70104-traction pull rod adaptor hole.

[0034] 70201-fixed restraint half ring, 70202-fixed seat, 70203-traction rod fixing hole.

[0035] 801-externally threaded flange, 802-stay cable through hole, 803-positioning bolt, 804-buffer spring, 805-externally threaded half flange.

[0036] The specific contents of the present invention are further explained in detail below in conjunction with embodiments. DETAILED DESCRIPTION

[0037] It should be noted that all the equipment and components in the present invention, unless otherwise specified, are all equipment and components known in the prior art. In the present invention, when the span of the main bridge of the cable-stayed bridge is more than 500m, due to the geometric configuration and force requirements, the longest cable length is usually more than 300m. Such cables are defined as super-long cables because their length exceeds the conventional design threshold (≥300m); combined with their spatial positioning characteristics in the cable plane along the bridge, they are specifically called super-long longitudinal cables (referred to as super-long longitudinal cables).

[0038] Specific embodiments of the present invention are given below. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent changes made on the basis of the technical solution of this application fall within the protection scope of the present invention.

[0039] Embodiment 1:

[0040] This embodiment provides a self-balancing device for preventing the cable from slipping during the tensioning process of an ultra-long longitudinal cable. Figure 1 and Figure 2 As shown, the device includes a cable-stayed cable 1, the rear end of which is provided with an anchor cup 2, and the rear part of the cable-stayed cable 1 is also provided with a cable body protective cover 3 fixedly connected to the cable-stayed cable 1 and the anchor cup 2; the rear end of the anchor cup 2 is detachably connected to the front end of an extension rod 4, the rear part of the extension rod 4 is anchored by a temporary anchoring mechanism 5, and the rear end of the extension rod 4 passes through the temporary anchoring mechanism 5 and is pulled by a through-type tensioning jack 6.

[0041] like Figure 1 and Figure 2 As shown, an auxiliary traction mechanism 7 is also fastened and sleeved on the extension rod 4 , and the front end of the auxiliary traction mechanism 7 is connected to the cable body protection cover 3 ; the rear end of the auxiliary traction mechanism 7 is connected to the temporary anchoring mechanism 5 .

[0042] like Figure 1 and Figure 2As shown, the stay cable 1 is also provided with an annular anti-stuck-drop buffer 8, and the stay cable 1 can move axially in the annular anti-stuck-drop buffer 8, and the outer side of the annular anti-stuck-drop buffer 8 is detachably installed in the cable guide tube 9 near the cable entry end.

[0043] As a further solution of this embodiment, Figure 2 As shown, it also includes a bridge tower 10, on which a plurality of reserved channels 11 are opened, in which a cable guide tube 9 is installed, and a support surface 12 is provided on the bridge tower 10 at the cable outlet end of the reserved channel 11, and a through-type tensioning jack 6 is installed on the top surface of a jack support frame 13, the bottom of the jack support frame 13 is open and rests on the support surface 12, and an extension rod 4 passes through a central through hole 14 on the top surface of the jack support frame 13 and is pulled by the through-type tensioning jack 6; a temporary anchoring mechanism 5 is located in the jack support frame 13.

[0044] As a specific solution of this embodiment, Figures 3 to 5 As shown, the temporary anchoring mechanism 5 includes a circular adapter ingot 501, the interior of the circular adapter ingot 501 is an axially through-hollow structure, a locking sleeve 502 is coaxially integrated on the circular adapter ingot 501, the extension rod 4 passes through the circular adapter ingot 501 and the anchoring sleeve 502 in sequence, and an anchoring sleeve 503 is installed on the locking sleeve 502. The cooperation of the anchoring sleeve 503 and the locking sleeve 502 realizes the anchoring of the extension rod 4.

[0045] like Figures 3 to 5 As shown, the outer diameter of the circular adapter ingot 501 is larger than the outer diameter of the locking sleeve 502, and an axially through-going anchor hole 504 is opened on the circular adapter ingot 501 outside the locking sleeve 502. The rear ends of a pair of rigid pull rods 705 of the auxiliary traction mechanism 7 pass through the anchor hole 504 and are installed on the circular adapter ingot 501 through a fixing nut 708.

[0046] like Figures 3 to 5 As shown, the circular adapter ingot 501 is supported on the supporting surface 12 of the bridge tower 10 through the anchor plate 505. A through hole is opened in the center of the anchor plate 505. The inner diameter of the through hole is smaller than the outer diameter of the circular adapter ingot 501, and the inner diameter of the through hole is larger than the inner diameter of the cable guide tube 9.

[0047] As a specific solution of this embodiment, Figures 6 to 7 As shown, the auxiliary traction mechanism 7 includes a transfer restraint ring 701 and a fixed restraint ring 702 , and the transfer restraint ring 701 and the fixed restraint ring 702 are fastened and sleeved on the extension rod 4 .

[0048] like Figure 6As shown, the transfer constraint ring 701 includes two split transfer constraint half-rings 70101 detachably connected together. Each transfer constraint half-ring 70101 is provided with a transfer seat 70102, and the two transfer seats 70102 are symmetrically arranged. Along the axial direction, each transfer seat 70102 is respectively provided with a rigid pull rod transfer hole 70103 and a traction pull rod transfer hole 70104. A pair of rigid pull rod transfer holes 70103 are symmetrically arranged, and a pair of traction pull rod transfer holes 70104 are also symmetrically arranged.

[0049] As Figures 6 to 7 shown, the rear ends of a pair of rigid pull rods 705 are correspondingly installed in a pair of rigid pull rod transfer holes 70103 through adjusting nuts 703 and lock nuts 704. The front ends of the pair of rigid pull rods 705 are installed on the cable body protective sleeve 3 through an anchoring ring 706.

[0050] As Figure 1 and Figure 6 shown, the front ends of a pair of traction pull rods 707 are correspondingly installed in a pair of traction pull rod transfer holes 70104 through adjusting nuts 703 and lock nuts 704. The rear ends of the pair of traction pull rods 707 are installed in the anchoring holes 504 of the temporary anchoring mechanism 5.

[0051] As Figure 6 shown, the fixed constraint ring 702 includes two split fixed constraint half-rings 70201 detachably connected together. Each fixed constraint half-ring 70201 is provided with a fixed seat 70202, and the two fixed seats 70202 are symmetrically arranged. Along the axial direction, each fixed seat 70202 is respectively provided with a traction pull rod fixing hole 70203. A pair of traction pull rod fixing holes 70203 are symmetrically arranged.

[0052] As Figure 6 shown, a pair of traction pull rods 707 pass through a pair of traction pull rod fixing holes 70203, and the traction pull rods 707 are installed on the fixed seats 70202 through adjusting nuts 703 and lock nuts 704.

[0053] In this embodiment, the rigid pull rods 705 can provide additional lateral support and connection for the stay cable structure, improve the overall stiffness and stability of the cable body, and reduce the damage to the cable body during the traction process.

[0054] In this embodiment, the traction pull rods 707 are relatively flexible cable structures, which can effectively resist large unbalanced forces, bear important mechanical functions, and provide key support for the stability of the entire structure.

[0055] As a specific solution of this embodiment, as Figures 8 to 9As shown, the annular anti-stuck buffer 8 includes two parallel external threaded flanges 801, and a cable through hole 802 is axially opened between the two external threaded flanges 801; the cable 1 can move axially in the cable through hole 802; the two external threaded flanges 801 are installed in the cable guide tube 9 through the external threads on the outer wall.

[0056] like Figures 8 to 9 As shown, the two externally threaded flanges 801 are connected by a plurality of axially arranged positioning bolts 803, and the plurality of positioning bolts 803 are evenly arranged in the circumferential direction; a plurality of axially arranged buffer springs 804 are also installed between the two externally threaded flanges 801, and the plurality of buffer springs 804 are evenly arranged in the circumferential direction; the buffer springs 804 and the positioning bolts 803 are alternately arranged in the circumferential direction.

[0057] like Figures 8 to 9 As shown, the external threaded flange 801 includes two split external threaded half flanges 805 that are detachably spliced ​​together, and the two external threaded half flanges 805 are also connected by positioning bolts 803.

[0058] Embodiment 2:

[0059] This embodiment provides a super-long longitudinal cable tensioning construction method, which adopts the self-balancing device for preventing the cable from slipping during the super-long longitudinal cable tensioning process provided in Example 1.

[0060] like Figure 10 As shown, the construction method comprises the following steps:

[0061] Step one, erect the main beam extending from the bridge tower 10 to the symmetrical cantilever on both sides, and first erect the first segment stiffening beam. Subsequently, transport the inclined cable 1 to the designated position of the stiffening beam on one side. Pre-install the extension rod 4 at the rear end of the inclined cable 1 through the anchor cup 2, and install the transition constraint ring 701 at the extension rod 4 at the rear end of the anchor cup 2. Next, install the rigid pull rod 705 and the traction pull rod 707 on the transition constraint ring 701, and further connect the rigid pull rod 706 to the cable body protective cover through the anchor ring 706. Finally, install the fixed constraint ring 702 on the extension rod 4 to fix the traction pull rod 707.

[0062] Step 2: Use a winch to pull the cable 1 to the anchor box at the bottom of the beam with a guide pulley, first anchor the cable 1 at the beam end, and pre-install a known temporary anchoring mechanism. After the anchoring is completed, use the tower top winch 15 to pull the cable 1 and the traction cable, and hoist them to the pre-buried cable guide 9 at the end of the bridge tower 10.

[0063] Step 3: The hoist 15 at the top of the tower lifts the soft traction and the anchor cup at the tower end. The gantry crane at the top of the tower simultaneously lifts the cable clamp. After reaching the nozzle of the tower end cable duct 9, through the cooperation of the tower crane, the manual assistance of the hanging basket outside the tower, and the lifting of the gantry crane at the top of the tower, etc., gradually adjust the angle and attitude of the soft-hard combined traction stay cable 1 entering the cable duct 9. After the angles are parallel and consistent, slowly introduce the soft traction steel strand into the cable duct 9. Using the pre-reserved threads inside the cable duct 9, install the splicable annular anti-falling buffer 8 at a position near the cable inlet end of the cable duct 9. The annular anti-falling buffer 8 is firmly fixed inside the cable duct 9 through threaded connection, which can effectively prevent the stay cable 1 from slipping or falling off during the tensioning process.

[0064] Step 4: Use the hoist 15 at the top of the tower to traction the soft traction jack 16 to make the anchor cup 2 reach the designated position (this invention only aims at the anchor cup 2 located inside the cable duct 9), and temporarily fix the extension rod 4 on the support surface 12 of the bridge tower.

[0065] Step 5: Install the jack support frame 13 and the temporary anchoring mechanism 5 on the support surface 12. Sleeve the anchor backing plate 505 on the extension rod 4. The anchor backing plate 505 is located between the support surface 12 and the circular adapter ingot 501. Fix the traction rod 707 in the anchoring hole 504 on the circular adapter ingot 501 using the fixing nut 708, and rotate the internal thread of the anchoring sleeve 503 on the locking sleeve 502 to achieve the anchoring of the extension rod 4.

[0066] Step 6: Install the through-hole tensioning jack 6 on the jack support frame 13. When initially tensioning, use the through-hole tensioning jack 6 to tension the extension rod 4. When reaching the initial tension, continue to rotate the anchoring sleeve 503 to anchor the extension rod 4, and rotate the fixing nut 708 to further fix the traction rod 707.

[0067] Step 7: Repeat the above steps at the stiffening girder on the other side of the bridge tower 10 to tension the stay cable 1 on the other side.

[0068] Step 8: Symmetrically cantilever extend the second section of the stiffening girder from the bridge tower 10 to both sides, and sequentially repeat the above steps to install and tension the second group of stay cables 1.

[0069] Step 9: Repeat the above steps until the initial tensioning of all groups of stay cables 1 is completed.

[0070] Step 10: After the main girder is closed or the bridge deck paving is completed, conduct a re-measurement of the cable forces of the whole bridge, and implement the secondary tensioning according to the design construction process. At this stage, the initial tension pulls the cable body anchor head to the designated anchoring point to complete the permanent anchoring of the stay cable 1. Subsequently, remove the auxiliary traction mechanism 7, the construction platform, the hanging basket and other temporary construction facilities.

Claims

1. A self-balancing device for preventing a cable from slipping during the tensioning of an ultra-long longitudinal cable, the device comprising a stay cable (1), an anchor cup (2) being arranged at the rear end of the stay cable (1), and a cable body protective cover (3) being fixedly connected to the stay cable (1) and the anchor cup (2) being arranged at the rear of the stay cable (1); characterized in that: The rear end of the anchor cup (2) is detachably connected to the front end of the extension rod (4), the rear part of the extension rod (4) is anchored by a temporary anchoring mechanism (5), and the rear end of the extension rod (4) passes through the temporary anchoring mechanism (5) and is pulled by a through-type tensioning jack (6); The extension rod (4) is also fastened with an auxiliary traction mechanism (7), the front end of which is connected to the cable body protection cover (3); the rear end of which is connected to the temporary anchoring mechanism (5); The inclined cable (1) is also provided with an annular anti-stuck-fall buffer (8), and the inclined cable (1) can move axially in the annular anti-stuck-fall buffer (8), and the outer side of the annular anti-stuck-fall buffer (8) is detachably installed in the cable guide tube (9) at a position close to the cable entry end.

2. The self-balancing device for preventing the cable from slipping during the tensioning process of the super-long longitudinal cable according to claim 1, characterized in that: The invention also comprises a bridge tower (10), wherein a plurality of reserved channels (11) are provided on the bridge tower (10), a cable guide tube (9) is installed in the reserved channels (11), a support surface (12) is provided on the bridge tower (10) at the cable outlet end of the reserved channels (11), the through-type tensioning jack (6) is installed on the top surface of the jack support frame (13), the bottom of the jack support frame (13) is open and rests on the support surface (12), the extension rod (4) passes through the central through hole (14) on the top surface of the jack support frame (13) and is pulled by the through-type tensioning jack (6); and the temporary anchoring mechanism (5) is located in the jack support frame (13).

3. The self-balancing device for preventing the cable from slipping during the tensioning process of the super-long longitudinal cable according to claim 1, characterized in that: The temporary anchoring mechanism (5) comprises a circular adapter ingot (501), the interior of the circular adapter ingot (501) is an axially through-hollow structure, a locking sleeve (502) is coaxially integrated on the circular adapter ingot (501), the extension rod (4) passes through the circular adapter ingot (501) and the anchoring sleeve (502) in sequence, an anchoring sleeve (503) is installed on the locking sleeve (502), and the anchoring sleeve (503) and the locking sleeve (502) cooperate to realize the anchoring of the extension rod (4).

4. The self-balancing device for preventing the cable from slipping during the tensioning process of the super-long longitudinal cable as claimed in claim 3, characterized in that: The outer diameter of the circular adapter ingot (501) is greater than the outer diameter of the locking sleeve (502), and an axially through-going anchor hole (504) is provided on the circular adapter ingot (501) outside the locking sleeve (502). The rear ends of a pair of rigid pull rods (705) of the auxiliary traction mechanism (7) pass through the anchor hole (504) and are installed on the circular adapter ingot (501) via a fixing nut (708).

5. The self-balancing device for preventing the cable from slipping during the tensioning process of the super-long longitudinal cable as claimed in claim 3, characterized in that: The circular transfer ingot (501) is supported on the support surface (12) of the bridge tower (10) through an anchor plate (505), and a through hole is opened at the center of the anchor plate (505). The inner diameter of the through hole is smaller than the outer diameter of the circular transfer ingot (501), and the inner diameter of the through hole is larger than the inner diameter of the cable guide tube (9).

6. The self-balancing device for preventing the cable from slipping during the tensioning process of the super-long longitudinal cable according to claim 1, characterized in that: The auxiliary traction mechanism (7) comprises a transfer constraint ring (701) and a fixed constraint ring (702), and the transfer constraint ring (701) and the fixed constraint ring (702) are tightly sleeved on the extension rod (4); The transfer constraint ring (701) comprises two transfer constraint half rings (70101) which are detachably connected together, each transfer constraint half ring (70101) is provided with a transfer seat (70102), and the two transfer seats (70102) are symmetrically arranged; each transfer seat (70102) is provided with a rigid pull rod transfer hole (70103) and a traction pull rod transfer hole (70104) along the axial direction, a pair of rigid pull rod transfer holes (70103) are symmetrically arranged, and a pair of traction pull rod transfer holes (70104) are also symmetrically arranged; The rear ends of a pair of rigid pull rods (705) are correspondingly installed in the pair of rigid pull rod adapter holes (70103) through adjusting nuts (703) and anti-loosening nuts (704), and the front ends of the pair of rigid pull rods (705) are installed on the cable body protective cover (3) through anchoring rings (706); The front ends of a pair of traction rods (707) are correspondingly installed in the pair of traction rod adapter holes (70104) through the adjusting nut (703) and the anti-loosening nut (704), and the rear ends of the pair of traction rods (707) are installed on the anchoring holes (504) of the temporary anchoring mechanism (5); The fixed constraint ring (702) comprises two split fixed constraint half rings (70201) connected together in a detachable manner, each fixed constraint half ring (70201) is provided with a fixed seat (70202), and the two fixed seats (70202) are symmetrically arranged; each fixed seat (70202) is provided with a traction rod fixing hole (70203) along the axial direction, and a pair of traction rod fixing holes (70203) are symmetrically arranged; The pair of traction rods (707) pass through the pair of traction rod fixing holes (70203), and the traction rods (707) are installed on the fixing seat (70202) by means of the adjusting nut (703) and the anti-loosening nut (704).

7. The self-balancing device for preventing the cable from slipping during the tensioning process of the super-long longitudinal cable according to claim 1, characterized in that: The annular anti-stuck buffer (8) comprises two externally threaded flanges (801) arranged in parallel, and a cable-through hole (802) is provided in the middle of the two externally threaded flanges (801) along the axial direction; the cable (1) can move axially in the cable-through hole (802); the two externally threaded flanges (801) are installed in the cable guide tube (9) through the external threads on the outer side walls; The two externally threaded flanges (801) are connected by a plurality of axially arranged positioning bolts (803), and the plurality of positioning bolts (803) are evenly arranged in the circumferential direction; a plurality of axially arranged buffer springs (804) are also installed between the two externally threaded flanges (801), and the plurality of buffer springs (804) are evenly arranged in the circumferential direction; the buffer springs (804) and the positioning bolts (803) are alternately arranged in the circumferential direction.

8. The self-balancing device for preventing the cable from slipping during the tensioning process of the super-long longitudinal cable as claimed in claim 7, characterized in that: The externally threaded flange (801) comprises two externally threaded half flanges (805) which are detachably spliced ​​together, and the two externally threaded half flanges (805) are also connected by the positioning bolts (803).

9. A super-long longitudinal cable tensioning construction method, characterized in that: The method adopts the self-balancing device for preventing the cable from slipping during the tensioning process of the super-long longitudinal cable as described in any one of claims 1 to 8.

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