Method for installing central buckle of suspension bridge

Abstract

The application relates to a method for installing a central buckle of a suspension bridge, which comprises the following steps: forming longitudinal constraint on the beam end of the stiffening beam on the same side of the installation position of the central buckle cable by using a longitudinal fixing device; arranging a load on the loading position of the stiffening beam after the longitudinal constraint on the beam end is completed; measuring the real-time pin hole distance after the load is arranged; installing the central buckle cable by using a chain hoist when the real-time pin hole distance is smaller than the unstressed length of the central buckle cable; in the above construction process, the longitudinal constraint is formed on the beam end of the stiffening beam by using the longitudinal fixing device, so that the cable beam generates relative displacement after the load is arranged on the loading position; the displacement can be used to reduce the pin hole distance, the installation requirement is met, then the chain hoist is directly used for traction, the equipment structure used in the above steps is simple, and the central buckle can be installed without using special tooling 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, in particular to a method for installing a central buckle of a suspension bridge. BACKGROUND

[0002] Currently, the central buckle (also known as a central clamp) of a suspension bridge is connected to the main cable and the stiffening beam at the midspan by certain structural measures, thereby reducing the longitudinal displacement of the beam end and the local bending of the short hanger.

[0003] The central buckle end connection is mostly connected by a pin connection, 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 locally stiffened, that is, the pin connection end of the central buckle is tensioned by using special tooling and tensioning equipment to gradually reduce the distance between the pin hole of the cable clamp ear plate of the pin connection end and the pin hole of the stiffening beam, until the distance between the pin hole of the cable clamp ear plate of the pin connection end and the pin hole of the stiffening beam is less than the unstressed length of the central buckle cable, but there are the following problems:

[0004] Because the structure of the special tooling and tensioning equipment is complex, the installation method is complicated, and in addition, the special tooling and tensioning equipment requires a large investment, resulting in high final installation cost. Therefore, a method for installing a central buckle of a suspension bridge is proposed to reduce the installation difficulty and reduce the installation cost. SUMMARY

[0005] The embodiments of the present application provide a method for installing a central buckle of a suspension bridge to solve the problem of complex structure of special tooling and tensioning equipment in related art, which leads to complicated installation method and high installation cost.

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

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

[0008] After completing the longitudinal constraint on the beam end, arranging a load at the loading position of the stiffening beam, and then measuring the real-time pin hole distance after the load is applied. 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 real-time pin hole distance is less than the unstressed length of the central buckle cable, the central buckle cable is installed by using a hand-operated hoist.

[0010] In some embodiments, before the longitudinal constraint on the beam end is formed by using the longitudinal fixing device, the following steps are further included:

[0011] measuring the pin hole distance between the pin hole of the cable clamp ear plate of the central buckle and the pin hole of the stiffening beam; and then comparing the pin hole distance with the unstressed length of the central buckle cable;

[0012] If the pin hole distance is less than the unstressed length of the central buckle cable, it indicates that the installation requirements of the central buckle are met, and the central buckle cable is directly installed by using the hand-operated hoist to pull;

[0013] If the pin hole distance is greater than or equal to the unstressed length of the central buckle cable, it indicates that the installation requirements of the central buckle are not met, and then the step of using a longitudinal fixing device to longitudinally constrain the beam end is performed.

[0014] In some embodiments, the load is arranged at the loading position of the stiffening beam, including the following steps:

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

[0016] The load is arranged near the maximum value of the cable-beam distance change influence line, and the current cable-beam distance is calculated; the current cable-beam distance is compared with the unstressed length of the central buckle cable; if the current cable-beam distance is less than the unstressed length of the central buckle cable, the loading position and the load corresponding to the current cable-beam distance can be used;

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

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

[0019] In some embodiments, the longitudinal fixing device includes a jack and a pad beam, the pad beam is welded with the corbel of the stiffening beam, and the jack is located between the stop block of the bridge tower corresponding to the beam end and the pad beam.

[0020] The telescopic end of the jack is used to tighten the pad beam, and the other end of the jack is tightly contacted with the stop block.

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

[0022] The pad beam is welded on the corbel of the stiffening beam;

[0023] The jack is suspended on the bridge tower accessory by using a lifting tool; then the jack is lowered until the jack is located between the stop block and the pad beam;

[0024] The jack is adjusted so that the center line of the jack is coaxial with the center of the pad beam.

[0025] In some embodiments, the longitudinal fixing device includes a plurality of longitudinal fixing devices, and the plurality of longitudinal fixing devices are uniformly distributed along the transverse direction of the stiffening beam.

[0026] In some embodiments, the number of the hand-operated hoists is multiple, and the hand-operated hoists are divided into a first group and a second group; the first group and the second group are arranged on the two sides of the longitudinal bridge of the central buckle cable;

[0027] The installation of the central buckle of the suspension bridge by using the hand-operated hoist to pull the central buckle cable comprises the following steps:

[0028] The pulling ropes of the hand-operated hoists in the first group are connected with the stiffening beam and the central buckle cable;

[0029] The pulling ropes of the hand-operated hoists in the second group are connected with the stiffening beam and the central buckle cable;

[0030] The hand-operated hoists in the first group and the second group are adjusted to make the pin joint end of the central buckle cable concentric with the pin hole of the stiffening beam, and then the central buckle pin shaft is driven in.

[0031] In some embodiments, after the installation of the central buckle of the suspension bridge is completed, the control jack is retracted and is out of contact with the stiffening beam; then the pad beam is cut off and the damaged part is repaired.

[0032] In some embodiments, the central buckle of the suspension bridge comprises two central buckle cables in the longitudinal direction of the bridge;

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

[0034] The technical scheme provided by the present application has the following beneficial effects:

[0035] The installation method of the central buckle of the suspension bridge provided by the embodiments of the present application has the following beneficial effects: the longitudinal restraint is formed on the beam end of the stiffening beam on the same side of the installation position of the central buckle cable by using the longitudinal fixing device; after the longitudinal restraint on the beam end is completed, the load is arranged at the loading position of the stiffening beam, and then the real-time pin hole distance after the load is measured; when the real-time pin hole distance is less than the unstressed length of the central buckle cable, the central buckle cable is installed by using the hand-operated hoist; in the above construction process, the longitudinal restraint is formed on the beam end of the stiffening beam by using the longitudinal fixing device, so that the relative displacement of the cable beam is generated after the load is arranged at the loading position, and the displacement can be used to reduce the pin hole distance to meet the installation requirements, and then the hand-operated hoist is directly used for traction; the equipment used in the above steps has a simple structure, and the central buckle can be installed without using special tooling and tensioning equipment, so that the installation method is simplified and the installation cost is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0036] In order to more clearly illustrate the technical scheme in the embodiments of the present application, the drawings needed in the embodiment description will be briefly introduced as follows. Obviously, the drawings in the following description are only some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort.

[0037] Figure 1 A schematic diagram of the installation of the central buckle of the suspension bridge by using the displacement of temperature change is provided for the embodiment of the present application;

[0038] Figure 2 A schematic diagram of the structure of the longitudinal fixing device is provided for the embodiment of the present application;

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

[0040] Figure 4 A schematic diagram of the installation of the central buckle cable by using the hand-operated hoist is provided for the embodiment of the present application;

[0041] Figure 5 A schematic diagram of the installation of the central buckle of the suspension bridge by using the displacement of the heavy load is provided for the embodiment of the present application;

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

[0043] To make the purpose, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0044] The connection mode of the central buckle end is generally a pin connection mode, and the pin connection installation is difficult. The common installation method is to use special tooling and tensioning equipment for tensioning installation. The stiffened beam needs to be locally stiffened, that is, the pin connection end of the central buckle is tensioned by using special tooling and tensioning equipment, so as to gradually reduce the distance between the cable clamp ear plate pin hole of the pin connection end and the stiffened beam pin hole, until the distance between the cable clamp ear plate pin hole of the pin connection end and the stiffened beam pin hole is less than the unstressed length of the central buckle cable. However, the following problems exist:

[0045] Because the structure of the special tooling and tensioning equipment is complex, the installation mode is complicated, in addition, the special tooling and tensioning equipment need to be invested with a large cost, resulting in a high final installation cost. Therefore, a suspension bridge central buckle installation method is needed to reduce the installation difficulty and reduce the installation cost.

[0046] For the purpose of the application, it should be understood that:

[0047] Reference is made to the accompanying drawings Figure 3 , the general structure of the central buckle of the suspension bridge includes the cable clamp connected with the main cable 8, the cable clamp ear plate pin hole 300 is connected with two central buckle cables 301, and the sling 302 is 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 with the end of the central buckle cable 301 away from the cable clamp;

[0048] Generally, the central buckle cable 301 needs to be tensioned to the stiffening beam pin hole 101 through special tooling and tensioning equipment, because the pin hole distance is generally not directly installed with the central buckle 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, the embodiment of the application provides a suspension bridge central buckle installation method to solve the problem of complex structure of special tooling and tensioning equipment in the related art, which leads to complicated installation mode and high installation cost, and reference is made to the following description.

[0050] Reference is made to the accompanying drawings Figures 1-4 , a suspension bridge central buckle installation method, comprising:

[0051] Step 100, using the longitudinal fixing device 7 to form 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 longitudinal constraint on the beam end 2, and measuring the real-time pin hole distance in the process of environmental temperature rising; 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 unstressed length of the central buckle cable, using the chain hoist 9 to pull the central buckle cable for installation. L0 is the unstressed length of the central buckle cable, which can be referred to the content shown in the accompanying drawings. Figure 3

[0054] In the above construction process, the longitudinal fixing device 7 is used to constrain the beam end 2 of the stiffening beam 1 in the longitudinal direction, so as to directionally limit the displacement caused by temperature rising in the process of environmental temperature rising, and the displacement can be used to reduce the pin hole distance to meet the installation requirements, and then the chain hoist 9 is directly used for traction, the equipment used in the above steps has simple structure, and the central buckle can be installed without using special tooling and tensioning equipment, so as to simplify the installation mode and reduce the installation cost.

[0055] In some preferred embodiments, in some cases, the pin hole distance meets the installation requirements, so tensioning is not needed, and therefore the following operation is further included before step 100:​

[0056] Measure the pin hole distance between the cable clamp ear plate pin hole 300 and the stiffening beam pin hole 101; then compare the pin hole distance with the central buckle cable unstressed length;

[0057] If the pin hole distance is less than the central buckle cable unstressed length, it indicates that the installation requirements of the central buckle are met, and the central buckle cable is directly installed by using the chain hoist 9;

[0058] If the pin hole distance is greater than or equal to the central buckle cable unstressed length, it indicates that the installation requirements of the central buckle are not met, and then the step of using the longitudinal fixing device 7 to longitudinally constrain the beam end 2 is performed. That is, return to step 100.

[0059] In some preferred embodiments, step 200, after longitudinally constraining the beam end 2, and measuring the real-time pin hole distance during the ambient temperature rise, includes the following steps:

[0060] After longitudinally constraining the beam end 2, measure the pin hole distance at the current ambient temperature, and then calculate the reference temperature rise value in combination with the central buckle cable unstressed length;

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

[0062] If so, when the change amount of 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 is not installed on the day.

[0064] The above is the deformation caused by the directional constraint of temperature. If the temperature of the day does not meet the requirement of producing the required distance reduction, the installation cannot be successfully completed on the day, so this situation needs to be excluded. In addition, the reference temperature rise value is calculated according to the pin hole distance at the current ambient temperature and the central buckle cable unstressed length, including the following steps:

[0065] According to formula one, and in combination with the pin hole distance at the current ambient temperature and the central buckle cable unstressed length, the distance difference value is obtained;

[0066] According to formula two, and in combination with the distance difference value, the reference temperature rise value is obtained;

[0067] Formula one is: dL=L1-L0; where L1 is the pin hole distance at the current ambient temperature, and L0 is the central buckle cable unstressed length.

[0068] Formula two is: T=dL / dS; where dS is the change amount of the cable beam distance when the beam end 2 is longitudinally constrained in the whole bridge overall calculation model, and the whole bridge rises by 1℃, and T is the reference temperature rise value.

[0069] In some preferred embodiments, referring to Figure 1 and Figure 2 , the longitudinal fixing device 7 comprises a jack 700 and a cushion beam 701, the cushion beam 701 is welded with 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 with the stopper 6.

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

[0071] Weld the cushion beam 701 on the bracket 100 of the stiffening beam 1;

[0072] Use the lifting tool to suspend the jack 700 on the bridge tower accessory; then lower the jack 700 until the jack 700 is located between the stopper 6 and the cushion beam 701;

[0073] Adjust the jack 700 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 equipment used has low investment cost and does not need complex and expensive special equipment.

[0075] Further, the longitudinal fixing device 7 comprises a plurality of longitudinal fixing devices 7, which are uniformly distributed along the transverse direction of the stiffening beam 1. Such arrangement can make the constraint force more uniform when the longitudinal constraint is applied, and the cooperation of multiple jacks 700 reduces the specification requirements of the jack 700. Above, the operation of suspending the jack 700 on the bridge tower accessory by the lifting tool can make full use of the equipment on the bridge tower, avoiding the use of complex fixtures 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 tightly contacted with the stopper 6, the position can be fixed.

[0076] In some preferred embodiments, referring to Figure 4 , in step 300, the number of the hand-operated hoists 9 is multiple, and they are divided into a first group and a second group; the first group and the second group are respectively arranged on the two sides of the longitudinal direction of the central buckle cable 301;

[0077] The installation of the central buckle cable by using the hand-operated hoists 9 comprises the following steps:

[0078] Connect the traction ropes of the hand-operated hoists 9 in the first group with the stiffening beam 1 and the central buckle cable 301;

[0079] Connect the traction ropes of the hand-operated hoists 9 in the second group with the stiffening beam 1 and the central buckle cable 301;

[0080] Adjust the first group of hand-operated hoist 9 and the second group of hand-operated hoist 9 to make the pin joint end of the central buckle cable 301 concentric with the stiffening beam pin hole 101, and then drive the central buckle pin shaft.

[0081] In some preferred embodiments, the suspension bridge central buckle 3 comprises 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 is also installed using 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 only the longitudinal fixing device 7 needs to be arranged at the corresponding beam end 2;

[0083] A specific embodiment is described below:

[0084] The cushion beam 701 is arranged on the bank side, has a length of 50 cm, and is mainly made of Q235 material HW400x400 type steel and welded to the bracket 100 of the stiffening beam 1. The other side is welded to a head plate, and the head plate should be vertical. The head plate and the jack are in close contact to prevent the jack 700 and the I-shaped section from having too small contact area, causing local damage.

[0085] A 250t jack is selected, which has a length of 36 cm, a diameter of 35 cm, and a stroke of 18 cm, meeting the needs of the 110t single top stress of the central buckle installation on the south bank side. The jack is suspended on the bridge tower auxiliary platform through a 2t hand-operated hoist and a 2t sling. The jack is started and adjusted to be horizontal, and the jack should be vertically supported on the head plate and opposite to the middle position of the cushion block. A 5t sling is arranged to connect the central buckle cable 301 on the south bank side, and a 5t hand-operated hoist is anchored to the nearby side guardrail base and drainage pipe opening through a 5t sling. The 5t hand-operated hoist on the mid-span side is used for transverse positioning, and the 5t hand-operated hoist on the south bank side is used for traction in the direction of the central buckle.

[0086] When the stiffening beam 1 is heated by 5℃, the pin hole distance on the south bank side can be shortened by 18mm, and the single cushion block stress is about 110t. On the installation day of the central buckle cable 301, the upstream and downstream jacks are both extended by 15cm, and the temperature is waited 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 jacks is maintained. At this time, the central buckle tensioning system control personnel is immediately notified. Further waiting for the temperature to rise, at this time, the central buckle installation personnel tightens the 5t hand-operated hoist of the central buckle tensioning system in the mid-span, until the pin joint end of the central buckle cable 301 is concentric with the stiffening beam pin hole 101, and then the central buckle pin shaft is immediately driven, completing the installation of the central buckle cable 301.

[0087] The application further provides another method for installing the central buckle of a suspension bridge, which is a loading scheme for changing the pin hole distance, and specifically as follows.

[0088] Reference Figure 5 A method for installing the central buckle of a suspension bridge, comprising:

[0089] Step S100, forming 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 by using a longitudinal fixing device;

[0090] Step S200, after the longitudinal constraint on the beam end 2 is completed, arranging a load 5 at the loading position of the stiffening beam 1, and then measuring the real-time pin hole distance after the load 5 is loaded; 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 amount of sand;

[0091] Step S300, when the real-time pin hole distance is less than the unstressed length of the central buckle cable, the central buckle cable is installed by using a chain hoist 9.

[0092] The difference between the scheme of changing the temperature and the scheme of changing the load is that: in step S200, the load 5 is arranged at the loading position of the stiffening beam 1, comprising the following steps:

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

[0094] The load 5 is arranged near the maximum value of the cable-beam distance change influence line, and then the current cable-beam distance is calculated; the current cable-beam distance is compared with the unstressed length of the central buckle cable; if the current cable-beam distance is less than the unstressed length of the central buckle cable, the loading position corresponding to the current cable-beam distance and the load 5 can be used;

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

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

[0097] The principle of changing the pin hole distance by using the ballast is as follows:

[0098] The cable-beam distance change influence line, i.e., the direction and value of the cable-beam distance change, can be obtained by moving the load on the bridge deck, and accordingly the most unfavorable loading position and load value can be determined; the cable-beam produces a relative displacement at the most unfavorable loading position and load; the displacement can be used to reduce the pin hole distance to meet the installation requirements, and then the chain hoist is directly used for traction; the above steps use simple equipment structures, and the central buckle can be installed without using special tooling and tensioning equipment, so as to simplify the installation mode and reduce the installation cost.

[0099] In the description of the present application, it should be noted that the terms "upper", "lower", and the like are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. Unless otherwise expressly specified and limited, the terms "mounting", "connecting", "connecting" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two elements. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0100] It should be noted that in the present application, relational terms such as "first" and "second" and the like are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. Moreover, the terms "include", "contain" or any other variant thereof are intended to cover non-exclusive inclusion, so that the process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or device. Without more limitations, the element defined by the sentence "including a" does not exclude the presence of other identical elements in the process, method, article or device including the element.

[0101] The above is only a specific embodiment of the present application, which enables those skilled in the art to understand or implement the present application. Various modifications of 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 these embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features applied herein.

Claims

1. A method for installing a central buckle on a suspension bridge, characterized in that, It includes: Measure the distance between the pin hole (300) of the central buckle cable clamp ear plate and the pin hole (101) of the stiffening beam; then compare the pin hole distance with the stress-free length of the central buckle cable; If the distance between the pin holes is less than the stress-free length of the central buckle, it indicates 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). 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. Then, the 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 (301). After completing the longitudinal constraint of the beam end (2), load (5) is arranged at the loading position of the stiffening beam (1), and then the pin hole distance is measured in real time after the load (5) is applied; 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 arrangement of load (5) at the loading position of the stiffening beam (1) includes the following steps: constrain the longitudinal translation of the beam end (2) in the overall calculation model of the whole bridge, apply the bearing friction resistance, and obtain the influence line of the change in cable beam distance by moving the load on the bridge deck; arrange the load (5) near the maximum value of the influence line of the change in cable beam distance, and then calculate the current cable beam distance; compare the current cable beam distance with the stress-free length of the central cable tie; if the current cable beam distance is less than the stress-free length of the central cable tie, then 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; When the real-time pin hole distance is less 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 as described in claim 1, characterized in that: The load (5) includes vehicles or vehicles carrying cargo of design weight.

3. The method for installing the central buckle of a suspension bridge as described in claim 1, characterized in that, The longitudinal fixing device (7) includes a jack (700) and a pad beam (701), the pad beam (701) being welded to the corbel (100) of the stiffening beam (1); the jack (700) is located between the stop block (6) of the bridge tower (4) corresponding to the beam end (2) and the pad beam (701); The telescopic end of the jack (700) is used to press against the pad beam (701); the other end of the jack (700) is pressed against the stop block (6).

4. The method for installing the central buckle of a suspension bridge as described in claim 3, characterized in that, Installing the longitudinal fixing device (7) includes the following steps: The pad beam (701) is welded to the corbel (100) of the stiffening beam (1); The jack (700) is suspended on the bridge tower attachment using a lifting device; then the jack (700) is lowered until it is between the stop block (6) and the pad beam (701); Adjust the jack (700) so that the center line of the jack (700) is coaxial with the center of the pad beam (701).

5. The method for installing the central buckle of a suspension bridge as described in claim 1, characterized in that, The longitudinal fixing device (7) includes multiple devices, which are evenly spaced along the transverse direction of the stiffening beam (1).

6. The method for installing the central buckle of a suspension bridge as described in claim 3, characterized in that: The number of hand chain hoists (9) is multiple, and they are divided into a first group and a second group; the first group and the second group are respectively set on both sides of the longitudinal bridge direction of the central buckle (301); The installation using a hand-operated hoist (9) to pull the central cable includes the following steps: Connect the traction rope of the first set of hand chain hoists (9) to the stiffening beam (1) and the central buckle (301); Connect the traction rope of the second set of hand chain hoists (9) to the stiffening beam (1) and the central buckle (301); Adjust and pull the first group of hand chain hoists (9) and the second group of hand chain hoists (9) so that the pin end of the central buckle (301) is concentric with the stiffening beam pin hole (101), and then drive in the central buckle pin shaft.

7. The method for installing the central buckle of a suspension bridge as described in claim 4, characterized in that: After the central buckle of the suspension bridge is installed, the control jack (700) is retracted and disengaged from the stiffening beam (1); then the pad beam (701) is cut off and the damaged parts are repaired.

8. The method for installing the central buckle of a suspension bridge as described in claim 1, characterized in that: The suspension bridge has two central anchor cables (301) in the longitudinal direction. When installing one of the central fasteners (301), the other central fastener (301) is also installed using the central fastener installation method for suspension bridges as described in claim 1.

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