Mounting method for central buckle of suspension bridge

Abstract

The invention relates to a suspension bridge central buckle installation method. A longitudinal fixing device is used for forming longitudinal constraint on the beam end of a stiffening beam on the same side as the installation position of a central buckle cable; after longitudinal constraint on the beam end is completed, a load is arranged at the loading position of the stiffening beam; measuring the real-time pin hole distance after the load is loaded; when the real-time pin hole distance is smaller than the stress-free length of the central buckle, a chain block is used for pulling the central buckle for installation; in the construction process, the longitudinal fixing device is used for longitudinally restraining the beam end of the stiffening beam, so that after loads are arranged at the loading position, the cable beam generates relative displacement, the displacement can be used for reducing the pin hole distance and meeting the installation requirement, then a chain block is directly used for traction, and the equipment used in the steps is simple in structure and low in cost. And the central buckle can be installed without special tools and tensioning equipment, so that the installation mode is simplified, and the installation cost is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of bridge construction, and in particular to a method for installing a central buckle of a suspension bridge. Background Art

[0002] At present, the central buckle (also called central clamp) of suspension bridges connects the main cable and the stiffening beam at the mid-span through certain structural measures, thereby reducing the longitudinal displacement of the beam end and the local bending of the short suspension cable.

[0003] The central buckle end connection method is mostly pinned, and the pinned installation is difficult. The common installation method is to use special tooling and tensioning equipment for tensioning installation. The stiffening beam needs to be partially stiffened, that is, to use special tooling and tensioning equipment to tension the pinned end of the central buckle to gradually reduce the distance between the pin hole of the cable clamp ear plate at the pinned end and the pin hole of the stiffening beam, until the distance between the pin hole of the cable clamp ear plate at the pinned end and the pin hole of the stiffening beam is less than the stress-free length of the central buckle, but there are the following problems:

[0004] Due to the complex structure of special tooling and tensioning equipment, the installation method is cumbersome. In addition, the special tooling and tensioning equipment require a large investment, resulting in a high final installation cost. Therefore, a suspension bridge central buckle installation method is proposed to reduce the installation difficulty and reduce the installation cost. Summary of the invention

[0005] The embodiment of the present application provides a method for installing the central buckle of a suspension bridge to solve the problem that the special tooling and tensioning equipment in the related art have complex structures, resulting in cumbersome installation methods and high installation costs.

[0006] In a first aspect, a method for installing a central buckle of a suspension bridge is provided, comprising:

[0007] The longitudinal fixing device is used to form a longitudinal constraint on the beam end of the stiffening beam on the same side as the central cable installation position;

[0008] After completing the longitudinal constraint on the beam end, the load is arranged at the loading position of the stiffening beam, and then the real-time pin hole distance after the load is applied is measured; the pin hole distance is the distance between the pin hole of the cable clamp ear plate and the pin hole of the stiffening beam;

[0009] When the actual pin hole distance is less than the stress-free length of the central buckle, use a hand winch to pull the central buckle for installation.

[0010] In some embodiments, before longitudinally restraining the beam end using the longitudinal fixing device, the following steps are also included:

[0011] Measure the distance between the pin hole of the cable clip ear plate of the central buckle and the pin hole of the stiffening beam; then compare the distance between the pin holes with the stress-free length of the central buckle;

[0012] If the distance between the pin holes is less than the stress-free length of the central buckle, it means that the installation requirements of the central buckle are met, and the central buckle can be directly installed by pulling it with a hand chain hoist;

[0013] If the pin hole distance is greater than or equal to the stress-free length of the center buckle, it indicates that the installation requirements of the center buckle are not met, and then the step of longitudinally restraining the beam end using the longitudinal fixing device is performed.

[0014] In some embodiments, placing a load at a loading position of a stiffening beam comprises the following steps:

[0015] In the overall calculation model of the whole bridge, the longitudinal translation of the beam end is constrained, the bearing friction is applied, and the influence line of the cable-beam distance change is obtained by moving the load on the bridge deck;

[0016] Arrange the load near the maximum value of the influence line of the cable-beam distance variation, and then calculate the current cable-beam distance; compare the current cable-beam distance with the stress-free length of the central buckle; if the current cable-beam distance is less than the stress-free length of the central buckle, the loading position and load corresponding to the current cable-beam distance can be adopted;

[0017] Otherwise, change the loading position and load until the cable-to-beam distance meets the installation requirements.

[0018] In some embodiments, the load includes a vehicle or a vehicle loaded with cargo of a designed weight.

[0019] In some embodiments, the longitudinal fixing device includes a jack and a cushion beam, the cushion beam is welded to the bracket of the stiffening beam; the jack is located between the stopper of the bridge tower corresponding to the beam end and the cushion beam;

[0020] The telescopic end of the jack is used to tighten the cushion beam; the other end of the jack is tightened against the stopper.

[0021] In some embodiments, installing the longitudinal fixing device comprises the following steps:

[0022] Welding the cushion beam to the corbel of the stiffening beam;

[0023] The jack is hung on the bridge tower attachment by using a sling; then the jack is lowered until the jack is located between the stopper and the pad beam;

[0024] Adjust the jack so that the center line of the jack is coaxial with the center of the cushion beam.

[0025] In some embodiments, the longitudinal fixing device comprises a plurality of longitudinal fixing devices, and the plurality of longitudinal fixing devices are evenly spaced apart along the transverse direction of the stiffening beam.

[0026] In some embodiments, the hand chain hoists include a plurality of hand chain hoists, which are divided into a first group and a second group; the first group and the second group are respectively arranged on both sides of the longitudinal bridge of the central buckle cable;

[0027] The installation of the central buckle by hand chain hoist includes the following steps:

[0028] Connecting the traction rope of the first group of hand chain hoists to the stiffening beam and the central buckle cable;

[0029] Connect the traction rope of the second group of hand chain hoists to the stiffening beam and the central cable;

[0030] Adjust and pull the first and second groups of chain hoists so that the pin connection end of the central buckle cable is concentric with the pin hole of the stiffening beam, and then drive in the central buckle pin shaft.

[0031] In some embodiments, after the central buckle of the suspension bridge is installed, the jack is controlled to retract and disengage from the stiffening beam; then the cushion beam is cut off and the damaged part is repaired.

[0032] In some embodiments, the central buckle of the suspension bridge includes two central buckle cables upwardly of the longitudinal bridge;

[0033] When installing one of the central cables, the other central cable is also installed using the above-mentioned suspension bridge central cable installation method.

[0034] The beneficial effects of the technical solution provided by this application include:

[0035] The embodiment of the present application provides a method for installing the central buckle of a suspension bridge, which uses a longitudinal fixing device to form a longitudinal constraint on the beam end of the stiffening beam on the same side as the central buckle cable installation position; after completing the longitudinal constraint on the beam end, the load is arranged at the loading position of the stiffening beam, and then the real-time pin-hole distance after the load is applied is measured; when the real-time pin-hole distance is smaller than the stress-free length of the central buckle, the central buckle is towed by a hand winch for installation; during the above construction process, the longitudinal fixing device is used to longitudinally constrain the beam end of the stiffening beam, so that after the load is arranged at the loading position, the cable beam produces a relative displacement, and this displacement can be used to reduce the pin-hole distance to meet the installation requirements, and then the hand winch is directly used for towing, and the equipment used in the above steps has a simple structure, and the central buckle can be installed without the use of special tooling and tensioning equipment, so as to simplify the installation method and reduce the installation cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0037] Figure 1A schematic diagram of the installation of the central buckle of a suspension bridge using displacement due to temperature changes provided in an embodiment of the present application;

[0038] Figure 2 A schematic diagram of the structure of a longitudinal fixing device provided in an embodiment of the present application;

[0039] Figure 3 A schematic diagram of the structure of the central buckle of a suspension bridge provided in an embodiment of the present application;

[0040] Figure 4 A schematic diagram of the installation using a hand chain hoist to pull the central buckle provided in an embodiment of the present application;

[0041] Figure 5 A schematic diagram of the installation construction of the central buckle of a suspension bridge using the displacement of a ballast load provided in an embodiment of the present application;

[0042] In the figure: 1. stiffening beam; 100. corbel; 101. pin hole of stiffening beam; 2. beam end; 3. central buckle of suspension bridge; 300. pin hole of cable clamp ear plate; 301. central buckle cable; 302. suspension cable; 4. bridge tower; 5. load; 6. block; 7. longitudinal fixing device; 700. jack; 701. cushion beam; 8. main cable; 9. hand winch. DETAILED DESCRIPTION

[0043] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0044] The central buckle end connection is generally pinned, which is difficult to install. The common installation method is to use special tooling and tensioning equipment for tensioning installation. The stiffening beam needs to be partially stiffened, that is, to use special tooling and tensioning equipment to tension the pinned end of the central buckle to gradually reduce the distance between the pin hole of the cable clamp ear plate at the pinned end and the pin hole of the stiffening beam, until the distance between the pin hole of the cable clamp ear plate at the pinned end and the pin hole of the stiffening beam is less than the stress-free length of the central buckle, but there are the following problems:

[0045] Due to the complex structure of special tooling and tensioning equipment, the installation method is cumbersome. In addition, special tooling and tensioning equipment require a large investment, resulting in high final installation costs. Therefore, it is necessary to propose a suspension bridge central buckle installation method to reduce the installation difficulty and reduce the installation cost.

[0046] It should be understood that:

[0047] Reference Figure 3 The general structure of the central buckle of the suspension bridge includes a cable clamp connected to the main cable 8, a cable clamp ear plate pin hole 300 of the cable clamp is connected to two central buckle cables 301, and a sling 302 located between the two central buckle cables 301; the stiffening beam pin hole 101 of the stiffening beam 1 of the suspension bridge is connected to the end of the central buckle cable 301 away from the cable clamp;

[0048] Normally, special tooling and tensioning equipment are required to tension the central cable 301 to the pin hole 101 of the stiffening beam, because the pin hole distance is generally not suitable for directly installing the central cable 301; the pin hole distance is the distance between the cable clamp ear plate pin hole 300 and the stiffening beam pin hole 101.

[0049] Therefore, an embodiment of the present application provides a method for installing a central buckle of a suspension bridge to solve the problem that the structure of specialized tooling and tensioning equipment in the related technology is complex, resulting in cumbersome installation methods and high installation costs. Please refer to the following description.

[0050] See also Figure 1-Figure 4 , a method for installing a central buckle of a suspension bridge, comprising:

[0051] Step 100, using the longitudinal fixing device 7 to form a longitudinal constraint on the beam end 2 of the stiffening beam 1 on the same side as the installation position of the central buckle cable 301;

[0052] Step 200, after the beam end 2 is longitudinally constrained and during the process of ambient temperature rising, the real-time pin hole distance is measured; the pin hole distance is the distance between the cable clamp ear plate pin hole 300 and the stiffening beam pin hole 101;

[0053] Step 300: When the real-time pin hole distance is less than the stress-free length of the central buckle, the central buckle is pulled by the hand chain hoist 9 for installation. L0 is the stress-free length of the central buckle, which can be referred to in the attached figure. Figure 3 The content shown in .

[0054] During the above construction process, the longitudinal fixing device 7 is used to longitudinally constrain the beam end 2 of the stiffening beam 1, so as to directionally limit the displacement caused by the temperature rise during the ambient temperature rise. This displacement can be used to reduce the pin hole distance to meet the installation requirements, and then the hand winch 9 is directly used for traction. The equipment used in the above steps has a simple structure, and the central buckle can be installed without the use of special tooling and tensioning equipment, so as to simplify the installation method and reduce the installation cost.

[0055] In some preferred embodiments, in some cases, the distance between the pins and holes meets the installation requirements, so there is no need to perform tensioning. Therefore, the following operations are performed before step 100:

[0056] Measure the pin hole distance between the pin hole 300 of the cable clip ear plate of the central buckle and the pin hole 101 of the stiffening beam; then compare the pin hole distance with the stress-free length of the central buckle;

[0057] If the distance between the pin holes is less than the stress-free length of the central buckle, it means that the installation requirements of the central buckle are met, and the central buckle can be directly installed by pulling the hand chain hoist 9;

[0058] If the distance between the pin holes is greater than or equal to the stress-free length of the central buckle, it indicates that the installation requirements of the central buckle are not met, and then the step of longitudinally restraining the beam end 2 by using the longitudinal fixing device 7 is performed. That is, return to step 100.

[0059] In some preferred embodiments, step 200, after the beam end 2 is longitudinally constrained and the real-time pin hole distance is measured during the process of the ambient temperature rising, comprises the following steps:

[0060] After the beam end 2 is longitudinally restrained, the pin hole distance at the current ambient temperature is measured, and then the reference temperature rise value is calculated in combination with the stress-free length of the central buckle;

[0061] Determine whether the maximum value of the ambient temperature in the weather forecast for the day is greater than the sum of the current ambient temperature and the reference temperature rise value;

[0062] If so, when the change in the current ambient temperature is equal to the reference temperature rise value, measure again to obtain the real-time pin hole distance;

[0063] Otherwise, the central buckle installation will not be carried out on that day.

[0064] Because the above deformation is caused by the directional constraint brought by temperature, if the temperature on the day does not meet the requirement of reducing the required distance, the installation cannot be successful on the day. Therefore, this situation needs to be eliminated. In addition, the reference temperature rise value is calculated according to the pin hole distance and the stress-free length of the central buckle at the current ambient temperature, including the following steps:

[0065] According to formula 1, combined with the pin hole distance and the stress-free length of the central buckle at the current ambient temperature, the distance difference is obtained;

[0066] According to formula 2, the reference temperature rise value is obtained by combining the distance difference;

[0067] Formula 1 is: dL=L1-L0; where L1 is the pin-hole distance at the current ambient temperature, and L0 is the stress-free length of the central buckle.

[0068] Formula 2 is: T = dL / dS; dS is the cable-beam distance change dS obtained by constraining the longitudinal translation of beam end 2 in the overall calculation model of the whole bridge and heating the whole bridge by 1°C; T is the reference temperature rise value.

[0069] In some preferred embodiments, reference Figure 1 and Figure 2 The longitudinal fixing device 7 includes a jack 700 and a cushion beam 701, and the cushion beam 701 is welded to the corbel 100 of the stiffening beam 1; the jack 700 is located between the block 6 of the bridge tower 4 corresponding to the beam end 2 and the cushion beam 701; the telescopic end of the jack 700 is used to tighten the cushion beam 701; the other end of the jack 700 is tightened against the block 6.

[0070] The installation of the longitudinal fixing device 7 comprises the following steps:

[0071] Weld the cushion beam 701 to the corbel 100 of the stiffening beam 1;

[0072] Use a sling to hang the jack 700 on the bridge tower attachment; then lower the jack 700 until it is located between the stopper 6 and the cushion beam 701;

[0073] The jack 700 is adjusted so that the center line of the jack 700 is coaxial with the center of the cushion beam 701 .

[0074] The above describes the structure and installation form of the longitudinal fixing device 7. It can be seen that the investment cost of the equipment used is relatively low and no complicated and expensive special equipment is required.

[0075] Furthermore, the longitudinal fixing device 7 includes a plurality of longitudinal fixing devices 7, which are evenly spaced along the transverse direction of the stiffening beam 1. Such an arrangement can achieve a relatively uniform application of the longitudinal restraining force, and the coordinated arrangement of the plurality of jacks 700 reduces the specification requirements of the jacks 700. As described above, the operation of the sling hanging the jack 700 on the bridge tower attachment can make full use of the equipment on the bridge tower and avoid the use of complex tooling to fix the jack 700, because as long as the center line of the jack 700 is coaxial with the center of the cushion beam 701, and the jack 700 is pressed against the block 6, the position can be fixed.

[0076] In some preferred embodiments, reference Figure 4 As shown, in step 300, the hand chain hoists 9 include a plurality of groups, which are divided into a first group and a second group; the first group and the second group are respectively arranged on both sides of the longitudinal bridge of the central buckle cable 301;

[0077] The installation using the hand chain hoist 9 to pull the central buckle includes the following steps:

[0078] Connect the traction rope of the first group of hand chain hoists 9 to the stiffening beam 1 and the central buckle cable 301;

[0079] Connect the traction rope of the second group of hand chain hoists 9 to the stiffening beam 1 and the central buckle cable 301;

[0080] Adjust and pull the first group of hand chain hoists 9 and the second group of hand chain hoists 9 so that the pinned end of the central buckle cable 301 is concentric with the pin hole 101 of the stiffening beam, and then drive in the central buckle pin shaft.

[0081] In some preferred embodiments, the central buckle 3 of the suspension bridge includes two central buckle cables 301 in the longitudinal direction of the bridge;

[0082] When installing one of the central buckle cables 301, the other central buckle cable 301 also uses the above suspension bridge central buckle installation method. That is, after installing one central buckle cable 301 using the suspension bridge central buckle installation method, the other central buckle cable 301 is installed according to the same steps, and it is only necessary to set the longitudinal fixing device 7 at the corresponding beam end 2;

[0083] A specific embodiment is given below for illustration:

[0084] The cushion beam 701 is arranged on the shore side, with a processing length of 50cm. It uses Q235 material HW400×400 steel as the main structure and is welded to the bracket 100 of the stiffening beam 1. The head plate is welded on the other side, and the head plate should be vertical. The head plate and the jack are closely attached to prevent the contact area between the jack 700 and the I-shaped section from being too small, causing local damage.

[0085] A 250t jack is selected. This type of jack is 36cm long, 35cm in diameter, and has a stroke of 18cm. It meets the need for the installation of a single top force of 110t on the central buckle on the south bank side. The jack is suspended on the auxiliary platform of the bridge tower through a 2t hand chain hoist and a 2t sling. The jack is started and adjusted to horizontal. The jack should be supported vertically on the head plate and facing the middle position of the pad. A 5t sling is set to connect the central buckle cable 301 on the south bank side. The 5t hand chain hoist is anchored to the adjacent side guardrail base and drainage pipe opening through a 5t sling. The 5t hand chain hoist on the mid-span side is used for lateral adjustment, and the 5t hand chain hoist on the south bank side is used for traction and pulling along the direction of the central buckle.

[0086] When the temperature of the stiffening beam 1 rises by 5℃, the distance between the pin holes on the south bank can be shortened by 18mm, and the force on a single cushion block is about 110t. On the morning of the installation day of the central buckle cable 301, the upstream and downstream jacks both pushed out 15cm of stroke, waiting for the temperature to rise. When the cushion beam 701 approaches the jack 700, the stroke of the upstream and downstream jacks 700 is adjusted synchronously until the two jacks 700 synchronously contact the cushion beam 701, and the current state of the jack is maintained. At this time, the central buckle tensioning system control personnel are immediately notified. Further waiting for the temperature to rise, at this time, the central buckle installer tightens the central buckle tensioning system 5t hand chain hoist at the mid-span until the pin end of the central buckle cable 301 is concentric with the stiffening beam pin hole 101, and the central buckle pin shaft is immediately driven in to complete the installation of the central buckle cable 301.

[0087] This application also proposes another method for installing the central buckle of a suspension bridge, which uses a loading scheme to change the distance between the pin holes, as follows:

[0088] refer to Figure 5 , a method for installing a central buckle of a suspension bridge, comprising:

[0089] Step S100, using a longitudinal fixing device to form a longitudinal constraint on the beam end 2 of the stiffening beam 1 on the same side as the installation position of the central buckle cable 301;

[0090] Step S200, after completing the longitudinal constraint on the beam end 2, a load 5 is arranged at the loading position of the stiffening beam 1, and then the real-time pin hole distance after the load 5 is applied is measured; the pin hole distance is the distance between the pin hole 300 of the cable clamp ear plate and the pin hole 101 of the stiffening beam; the load 5 is an object with a certain weight, which can be a vehicle loaded with a certain weight of mud and sand;

[0091] Step S300: When the real-time pin-hole distance is smaller than the stress-free length of the central buckle, the central buckle is pulled by the hand chain hoist 9 for installation.

[0092] The difference from the scheme of temperature increase is that: step S200, arranging the load 5 at the loading position of the stiffening beam 1, includes the following steps:

[0093] In the overall calculation model of the whole bridge, the longitudinal translation of the beam end 2 is constrained, the bearing friction is applied, and the influence line of the cable-beam distance variation is obtained by moving the load on the bridge deck;

[0094] Place load 5 near the maximum value of the influence line of the cable beam distance variation, and then calculate the current cable beam distance; compare the current cable beam distance with the stress-free length of the central buckle; if the current cable beam distance is less than the stress-free length of the central buckle, the loading position and load 5 corresponding to the current cable beam distance can be adopted;

[0095] Otherwise, change the loading position and load 5 until the cable-beam distance meets the installation requirements.

[0096] The load 5 includes a vehicle or a vehicle loaded with cargo of a designed weight.

[0097] The principle of the above ballast changing the distance between pin holes is:

[0098] By moving the load on the bridge deck, the influence line of the cable-beam distance change can be obtained, that is, the direction and value of the cable-beam distance change, based on which the most unfavorable loading position and load value can be determined; at the most unfavorable loading position and load, the cable beam will produce relative displacement; this displacement can be used to reduce the pin hole distance to meet the installation requirements, and then the hand winch can be used directly for traction. The equipment used in the above steps has a simple structure, and the central buckle can be installed without the use of special tooling and tensioning equipment, so as to simplify the installation method and reduce the installation cost.

[0099] In the description of the present application, it should be noted that the terms "upper", "lower", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. Unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be a connection between the two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0100] It should be noted that, in this application, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the presence of other identical elements in the process, method, article or device including the elements.

[0101] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A method for installing a central buckle of a suspension bridge, characterized in that: It includes: A longitudinal fixing device (7) is used to form a longitudinal constraint on the beam end (2) of the stiffening beam (1) on the same side as the installation position of the central buckle cable (301); After the longitudinal constraint on the beam end (2) is completed, a load (5) is arranged at the loading position of the stiffening beam (1), and then the real-time pin hole distance after the load (5) is applied is measured; the pin hole distance is the distance between the pin hole (300) of the cable clamp ear plate and the pin hole (101) of the stiffening beam; When the actual pin hole distance is smaller than the stress-free length of the central buckle, the central buckle is pulled by a hand chain hoist (9) for installation.

2. The central buckle installation method according to claim 1, characterized in that: Before the beam end (2) is longitudinally restrained by the longitudinal fixing device (7), the following steps are also included: Measuring the distance between the pin hole (300) of the cable clip ear plate of the central buckle and the pin hole (101) of the stiffening beam; and then comparing the pin hole distance with the stress-free length of the central buckle; If the distance between the pin holes is less than the stress-free length of the central buckle, it means that the installation requirements of the central buckle are met, and the central buckle can be directly installed by pulling it with a hand chain hoist (9); If the pin hole distance is greater than or equal to the stress-free length of the central buckle, it indicates that the installation requirements of the central buckle are not met, and then the step of longitudinally restraining the beam end (2) using the longitudinal fixing device (7) is performed.

3. The central buckle installation method according to claim 2, characterized in that: Arranging the load (5) at the loading position of the stiffening beam 1 comprises the following steps: In the overall calculation model of the whole bridge, the longitudinal translation of the beam end 2 is constrained, the bearing friction is applied, and the influence line of the cable-beam distance variation is obtained by moving the load on the bridge deck; Place loads (5) near the maximum value of the influence line of the cable-beam distance variation, and then calculate the current cable-beam distance; compare the current cable-beam distance with the stress-free length of the central buckle; if the current cable-beam distance is less than the stress-free length of the central buckle, the loading position and load (5) corresponding to the current cable-beam distance can be adopted; Otherwise, change the loading position and load (5) until the cable-beam distance meets the installation requirements.

4. The central buckle installation method according to claim 3, characterized in that: The load (5) includes a vehicle or a vehicle loaded with cargo of a designed weight.

5. The method for installing the central buckle of a suspension bridge according to claim 1, characterized in that: The longitudinal fixing device (7) comprises a jack (700) and a cushion beam (701), wherein the cushion beam (701) is welded to the bracket (100) of the stiffening beam (1); the jack (700) is located between the stopper (6) of the bridge tower (4) corresponding to the beam end (2) and the cushion beam (701); The telescopic end of the jack (700) is used to tighten the cushion beam (701); the other end of the jack (700) is tightened against the stopper (6).

6. The method for installing the central buckle of a suspension bridge according to claim 5, characterized in that: Installing the longitudinal fixing device (7) comprises the following steps: Welding the cushion beam (701) to the bracket (100) of the stiffening beam (1); The jack (700) is hung on the bridge tower attachment by using a sling; the jack (700) is then lowered until the jack (700) is located between the stopper (6) and the cushion beam (701); The jack (700) is adjusted so that the center line of the jack (700) is coaxial with the center of the cushion beam (701).

7. The method for installing the central buckle of a suspension bridge according to claim 1, characterized in that: The longitudinal fixing device (7) comprises a plurality of longitudinal fixing devices (7), and the plurality of longitudinal fixing devices (7) are evenly spaced and distributed along the transverse direction of the stiffening beam (1).

8. The method for installing the central buckle of a suspension bridge according to claim 1, characterized in that: The hand chain hoists (9) are multiple in number and are divided into a first group and a second group; the first group and the second group are respectively arranged on both sides of the longitudinal bridge of the central buckle cable (301); The installation process of pulling the central buckle by means of a hand chain hoist (9) comprises the following steps: Connecting the traction rope of the first group of hand chain hoists (9) to the stiffening beam (1) and the central buckle cable (301); Connect the traction rope of the second group of hand chain hoists (9) to the stiffening beam (1) and the central buckle cable (301); The first group of hand chain hoists (9) and the second group of hand chain hoists (9) are adjusted and pulled so that the pin connection end of the central buckle cable (301) is concentric with the pin hole (101) of the stiffening beam, and then the central buckle pin shaft is driven in.

9. The method for installing the central buckle of a suspension bridge according to claim 8, characterized in that: After the central buckle of the suspension bridge is installed, the control jack (700) is retracted and separated from the stiffening beam (1); then the cushion beam (701) is cut off to repair the damaged part.

10. The method for installing the central buckle of a suspension bridge according to claim 1, characterized in that: The central buckle of the suspension bridge includes two central buckle cables (301) upwardly of the longitudinal bridge; When installing one of the central buckle cables (301), the other central buckle cable (301) is also installed using the suspension bridge central buckle installation method as claimed in claim 1.

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