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 central buckle cable installation position by using a longitudinal fixing device; measuring the real-time pin hole distance during the environmental temperature rising after the longitudinal constraint on the beam end; and installing the central buckle by using a chain hoist when the real-time pin hole distance is smaller than the unstressed length of the central buckle. 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 displacement caused by the temperature rising is directionally limited during the environmental temperature rising, the pin hole distance can be reduced by using the displacement, the installation requirement is met, and then the chain hoist is directly used for traction. The equipment structure used in the above steps is simple, the central buckle can be installed without using special tooling and tensioning equipment, 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 method is mostly connected by pin connection, which has a large installation difficulty. 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, so as to gradually reduce the distance between the pin hole of the cable clamp ear plate and the pin hole of the stiffening beam at the pin connection end, until the distance between the pin hole of the cable clamp ear plate and the pin hole of the stiffening beam at the pin connection end 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 the longitudinal constraint on the beam end, the real-time pin hole distance is measured during the rise of the ambient temperature. 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 beam end is longitudinally constrained by the longitudinal fixing device, the following steps are further included:

[0011] 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 is measured; and then the pin hole distance is compared 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;

[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 longitudinally restraining the beam end by using the longitudinal fixing device is performed.

[0014] In some embodiments, after the beam end is longitudinally restrained, the real-time pin hole distance is measured during the rise of the ambient temperature, including the following steps:

[0015] After the beam end 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 unstressed length of the central buckle cable;

[0016] It is judged whether the maximum value of the ambient temperature in the weather forecast of the day is greater than the sum of the current ambient temperature and the reference temperature rise value;

[0017] If yes, the real-time pin hole distance is obtained by measuring again when the change amount of the current ambient temperature is equal to the reference temperature rise value;

[0018] Otherwise, the central buckle is not installed on the day.

[0019] In some embodiments, the reference temperature rise value is calculated according to the pin hole distance at the current ambient temperature and the unstressed length of the central buckle cable, including the following steps:

[0020] According to formula one, and in combination with the pin hole distance at the current ambient temperature and the unstressed length of the central buckle cable, a distance difference value is obtained;

[0021] According to formula two, and in combination with the distance difference value, the reference temperature rise value is obtained;

[0022] Formula one is: dL=L1-L0; wherein L1 is the pin hole distance at the current ambient temperature, L0 is the unstressed length of the central buckle cable, and dL is the distance difference value;

[0023] Formula two is: T=dL / dS; wherein dS is the change amount of the cable beam distance when the beam end is longitudinally restrained in the whole bridge integral calculation model, and the whole bridge rises by 1℃; and T is the reference temperature rise value.

[0024] In some embodiments, the longitudinal fixing device includes a jack and a cushion beam, and the cushion beam is welded with the corbel of the stiffened beam; the jack is located between the stop block of the corresponding bridge tower of the beam end and the cushion beam;

[0025] The telescopic end of the jack is used to tightly press the cushion beam; the other end of the jack is tightly pressed with the stop block.

[0026] In some embodiments, the installation of the longitudinal fixing device comprises the following steps:

[0027] welding the cushion beam on the bracket of the stiffening beam;

[0028] suspending the jack on the bridge tower accessory by the lifting appliance; then lowering the jack until the jack is located between the stop block and the cushion beam;

[0029] adjusting the jack so that the center line of the jack is coaxial with the center of the cushion beam.

[0030] In some embodiments, the longitudinal fixing device comprises a plurality of longitudinal fixing devices, and the plurality of longitudinal fixing devices are evenly distributed along the transverse direction of the stiffening beam.

[0031] In some embodiments, the number of the hand-operated hoists is plural, and the plural hand-operated hoists 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 cable;

[0032] the installation of the central cable by the hand-operated hoists comprises the following steps:

[0033] connecting the traction rope of the first group of hand-operated hoists with the stiffening beam and the central cable;

[0034] connecting the traction rope of the second group of hand-operated hoists with the stiffening beam and the central cable;

[0035] adjusting the first group of hand-operated hoists and the second group of hand-operated hoists to make the pin joint end of the central cable coaxial with the pin hole of the stiffening beam, and then driving the central cable pin into the hole.

[0036] In some embodiments, after the installation of the central cable of the suspension bridge is completed, the jack is controlled to retract and is separated from the stiffening beam; then the cushion beam is cut off, and the damaged part is repaired.

[0037] In some embodiments, the central cable of the suspension bridge comprises two central cables in the longitudinal direction.

[0038] when one of the central cables is installed, the other central cable is also installed by the above-mentioned method for installing the central cable of the suspension bridge.

[0039] The technical scheme provided by the present application has the beneficial effects of:

[0040] The embodiment of the present application provides a suspension bridge central buckle installation method, since the longitudinal restraint is formed on the beam end of the stiffening beam on the same side of the central buckle cable installation position by using the longitudinal fixing device; after the longitudinal restraint of the beam end, the real-time pin hole distance is measured in the process of the environmental temperature rising; when the real-time pin hole distance is smaller than the unstressed length of the central buckle cable, the central buckle cable is installed by using the chain hoist traction; 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 displacement generated by the temperature rising is directionally limited in the process of the environmental temperature rising, the pin hole distance can be reduced by using the displacement, the installation requirement is met, and then the chain hoist is directly used for traction, the equipment used in the above steps is simple in structure, 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. BRIEF DESCRIPTION OF DRAWINGS

[0041] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used 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 on the basis of these drawings.

[0042] Figure 1 The construction schematic diagram of the suspension bridge central buckle installation by using the displacement of temperature change is provided for the embodiment of the present application.

[0043] Figure 2 The structure schematic diagram of the longitudinal fixing device is provided for the embodiment of the present application.

[0044] Figure 3 The structure schematic diagram of the suspension bridge central buckle is provided for the embodiment of the present application.

[0045] Figure 4 The installation schematic diagram of the central buckle cable by using the chain hoist traction is provided for the embodiment of the present application.

[0046] Figure 5 The construction schematic diagram of the suspension bridge central buckle installation by using the displacement of the dead load is provided for the embodiment of the present application.

[0047] In the drawings: 1, stiffening beam; 100, corbel; 101, stiffening beam pin hole; 2, beam end; 3, suspension bridge central buckle; 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, chain hoist. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, 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. Based on the embodiments in the present application, all other embodiments obtained by a person of ordinary skill in the art without creative work fall within the scope of protection of the present application.

[0049] The central buckle end connection method generally adopts pin connection, which has a large installation difficulty. A 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, so as 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 the following problems exist:

[0050] Because the special tooling and tensioning equipment has a complex structure, the installation method is complicated, and in addition, the special tooling and tensioning equipment needs to be invested in 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.

[0051] It should be understood that the present application:

[0052] Reference is made to the accompanying Figure 3 The general structure of the suspension bridge central buckle includes a cable clamp connected with the main cable 8, two central buckle cables 301 connected with the cable clamp ear plate pin hole 300 of the cable clamp, 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 with the end of the central buckle cable 301 away from the cable clamp;

[0053] Generally, the central buckle cable 301 needs to be tensioned to the stiffening beam pin hole 101 by using special tooling and tensioning equipment, because the pin hole distance, that is, the distance between the cable clamp ear plate pin hole 300 and the stiffening beam pin hole 101, cannot directly install the central buckle cable 301.

[0054] Therefore, the embodiments of the present application provide a suspension bridge central buckle installation method to solve the problem of complex structure of special tooling and tensioning equipment in the related art, resulting in a complicated installation method and high installation cost. Reference is made to the following description.

[0055] Reference is made to the accompanying Figures 1-4 A suspension bridge central buckle installation method, which comprises:

[0056] Step 100, using a 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;

[0057] Step 200, after the longitudinal constraint of the beam end 2, and during the environmental temperature rise, the real-time pin hole distance 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 stiffened beam;

[0058] Step 300, 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 chain hoist 9. L0 is the unstressed length of the central buckle cable, which can be referred to the content shown in the accompanying drawings. Figure 3

[0059] During the above construction, the longitudinal constraint device 7 is used to longitudinally constrain the beam end 2 of the stiffened beam 1, so as to directionally limit the displacement caused by the temperature rise during the environmental temperature rise. 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 a 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.

[0060] In some preferred embodiments, in some cases, the pin hole distance meets the installation requirements, so that tensioning is not required, and the following operation is further performed before step 100:

[0061] The pin hole distance between the pin hole 300 of the cable clamp ear plate of the central buckle and the pin hole 101 of the stiffened beam is measured; and then the pin hole distance is compared with the unstressed length of the central buckle cable;

[0062] 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 chain hoist 9;

[0063] 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 longitudinally constraining the beam end 2 by using the longitudinal constraint device 7 is performed. That is, it returns to step 100.

[0064] In some preferred embodiments, step 200, after the longitudinal constraint of the beam end 2, and during the environmental temperature rise, the real-time pin hole distance is measured, comprising the following steps:

[0065] After the longitudinal constraint of the beam end 2, the pin hole distance at the current environmental temperature is measured, and then the reference temperature rise value is calculated in combination with the unstressed length of the central buckle cable;

[0066] It is judged whether the maximum value of the environmental temperature in the weather forecast of the day is greater than the sum of the current environmental temperature and the reference temperature rise value;

[0067] ​If yes, when the change of current ambient temperature equals to the reference temperature rise value, the pin-hole distance is measured again to get the real-time pin-hole distance.

[0068] Otherwise, the central buckle is not installed on the day.

[0069] The above is the deformation caused by the directional constraint of temperature. If the temperature on the day cannot reach the requirement of generating the required distance reduction, the installation cannot be successful on the day. Therefore, the reference temperature rise value is calculated according to the pin-hole distance under the current ambient temperature and the unstressed length of the central buckle cable, including the following steps:

[0070] According to formula one, the distance difference value is obtained according to the pin-hole distance under the current ambient temperature and the unstressed length of the central buckle cable.

[0071] According to formula two, the reference temperature rise value is obtained according to the distance difference value.

[0072] Formula one is: dL=L1-L0; where L1 is the pin-hole distance under the current ambient temperature, and L0 is the unstressed length of the central buckle cable.

[0073] Formula two is: T=dL / dS; where dS is the change of cable beam distance when the beam end 2 is longitudinally translated and the whole bridge is heated by 1℃, and T is the reference temperature rise value.

[0074] In some preferred embodiments, the 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 stiffened 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 cushion beam 701. The telescopic end of the jack 700 is used to tighten the cushion beam 701, and the other end of the jack 700 is tightly pressed against the stop block 6.

[0075] The installation of the longitudinal fixing device 7 includes the following steps:

[0076] Weld the cushion beam 701 to the corbel 100 of the stiffened beam 1;

[0077] Use a lifting tool to suspend the jack 700 on the bridge tower accessory, and then lower the jack 700 until the jack 700 is located between the stop block 6 and the cushion beam 701;

[0078] Adjust the jack 700 so that the center line of the jack 700 is coaxial with the center of the cushion beam 701.

[0079] 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 require complex and expensive special equipment.

[0080] Further, the longitudinal fixing device 7 comprises 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 more uniform application of the longitudinal constraint force, and the use of multiple jacks 700 reduces the specification requirements for the jacks 700. In the above, the operation of suspending the jacks 700 from the bridge tower accessory can make full use of the equipment on the bridge tower, avoiding the use of complex fixtures to fix the jacks 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 in contact with the stop block 6, the position can be fixed.

[0081] In some preferred embodiments, with reference to Figure 4 As shown in step 300, the number of hand-operated hoists 9 is multiple, and is divided into a first group and a second group; the first group and the second group are respectively arranged on the longitudinal sides of the central buckle cable 301;

[0082] The installation of the central buckle cable by using the hand-operated hoists 9 includes the following steps:

[0083] The traction ropes of the hand-operated hoists 9 in the first group are connected with the stiffening beam 1 and the central buckle cable 301;

[0084] The traction ropes of the hand-operated hoists 9 in the second group are connected with the stiffening beam 1 and the central buckle cable 301;

[0085] The hand-operated hoists 9 in the first group and the second group are adjusted to make the pin-connected end of the central buckle cable 301 concentric with the pin hole 101 of the stiffening beam, and then the central buckle pin is driven in.

[0086] In some preferred embodiments, the central buckle 3 of the suspension bridge comprises two central buckle cables 301 in the longitudinal direction;

[0087] When one of the central buckle cables 301 is installed, the other central buckle cable 301 is also installed by using the above suspension bridge central buckle installation method. That is, after one central buckle cable 301 is installed by using the suspension bridge central buckle installation method, the other central buckle cable 301 is installed by following the same steps, and only the longitudinal fixing device 7 needs to be arranged at the corresponding beam end 2;

[0088] A specific embodiment is given below for illustration:

[0089] The cushion beam 701 is arranged on the shore side, has a length of 50 cm, uses Q235 material HW400x400 type steel as the main structure, and is welded to the corbel 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 is in close contact with the jack, preventing the contact area between the jack 700 and the I-shaped section from being too small and causing local damage.

[0090] The 250t jack is selected, the type of jack is 36cm long, 35cm in diameter, and 18cm in stroke, which meets the needs of the single jack stress of 110t of the central buckle installation on the south shore side. The jack is suspended on the bridge tower auxiliary platform through 2t hand-operated hoist and 2t sling. The jack is started and adjusted to be horizontal. The jack should be vertically supported on the head plate, and the middle position of the pad is directly opposite. The 5t sling is connected to the central buckle cable 301 on the south shore side. The 5t hand-operated hoist is anchored to the nearby side guardrail base and drainage pipe opening through the 5t sling. The 5t hand-operated hoist on the midspan side is used for transverse positioning, and the 5t hand-operated hoist on the south shore side is used for traction along the central buckle direction.

[0091] When the stiffening beam 1 is heated by 5℃, the south shore side pin hole distance can be shortened by 18mm, and the single pad stress is about 110t. The central buckle cable 301 is installed in the morning. The upstream and downstream jacks are both jacked out by 15cm stroke, and the temperature is waited to rise. When the pad 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 pad beam 701. The current state of the jack is kept, and the central buckle tensioning system controller is informed immediately at this time. The temperature is further waited to rise, and at this time, the central buckle installation personnel tension the 5t hand-operated hoist of the central buckle tensioning system in the midspan, 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 punched in at this time, and the installation of the central buckle cable 301 is completed.

[0092] Another suspension bridge central buckle installation method is also provided in the application, which is to change the pin hole distance by loading, and the specific method is as follows:

[0093] Reference Figure 5 A suspension bridge central buckle installation method, which comprises the following steps:

[0094] Step S100, the beam end 2 of the stiffening beam 1 on the same side of the installation position of the central buckle cable 301 is formed into longitudinal constraint by using a longitudinal fixing device;

[0095] Step S200, after the longitudinal constraint of the beam end 2 is completed, a load 5 is arranged at the loading position of the stiffening beam 1. The real-time pin hole distance is measured after the load 5 is measured. The pin hole distance is the distance between the ear plate pin hole 300 of the cable clamp and the stiffening beam pin hole 101. The load 5 is an object with a certain weight, which can be a vehicle loaded with a certain weight of sand;

[0096] 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 the hand-operated hoist 9.

[0097] The difference between the temperature rising scheme and the scheme is that step S200, a load 5 is arranged at the loading position of the stiffening beam 1, which comprises the following steps:

[0098] In the whole bridge integral calculation model, the beam end 2 is constrained in longitudinal translation, the bearing friction is applied, and the cable-beam distance variation influence line is obtained by moving the load on the bridge deck; the whole bridge integral calculation model is a common calculation method in the related art, and will not be specifically described here.

[0099] The load 5 is arranged near the position of the maximum value of the cable-beam distance variation 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 load 5 can be used at the loading position corresponding to the current cable-beam distance;

[0100] Otherwise, the loading position and the load 5 are changed until the cable-beam distance meets the installation requirements.

[0101] The load 5 includes a vehicle or a vehicle loaded with a designed weight of goods.

[0102] The principle of changing the pin hole distance by the ballast is as follows:

[0103] The cable-beam distance variation influence line, that is, the direction and value of the cable-beam distance variation, 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 relative displacement at the most unfavorable loading position and load; the pin hole distance can be reduced by using this displacement to meet the installation requirements, and then the cable-beam is directly pulled by using the hand-operated hoist, 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 that the installation mode is simplified and the installation cost is reduced.

[0104] In the description of the present application, it should be noted that the orientations or positional relationships indicated by the terms “upper”, “lower”, etc. are based on the orientations or positional relationships 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 a limitation on the present application. Unless otherwise explicitly specified and limited, the terms “mounting”, “connection”, “connection” should be understood broadly, for example, it can be fixed connection, or detachable connection, or integral connection; it can be mechanical connection, or electrical connection; it can be direct connection, or indirect connection through an intermediate medium, or internal communication of two elements. For those skilled in the art, the specific meanings of the above terms in the present application can be understood according to the specific circumstances.

[0105] It should be noted that, in this application, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any 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 comprising 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, an element defined by the sentence "comprising a ..." does not exclude the presence of other identical elements in the process, method, article or device comprising the element.

[0106] The foregoing is merely a list of specific embodiments of the present application, intended to enable those skilled in the art to understand or implement the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application is not limited to the embodiments shown herein, but is intended to conform to the broadest scope consistent with the principles and novel features of the present application.

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 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); When the real-time pin hole distance is less than the stress-free length of the central buckle cable, the central buckle cable is pulled by a hand chain hoist (9) for installation.

2. The method for installing the central buckle of a suspension bridge according to claim 1, characterized in that: Before longitudinally restraining the beam end (2) using the longitudinal fixing device (7), the following steps are also included: Measure 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; 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 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 method for installing the central buckle of a suspension bridge according to claim 2, characterized in that: After the beam end (2) is longitudinally restrained and the real-time pin-hole distance is measured during the ambient temperature rise process, the following steps are included: After longitudinal restraint at the beam end (2), the distance between the pin holes 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 cable; Determine whether the maximum 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; 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; Otherwise, the central buckle will not be installed on that day.

4. The method for installing the central buckle of a suspension bridge according to claim 3, characterized in that: The reference temperature rise value is calculated based on the pin hole distance and the stress-free length of the central cable at the current ambient temperature, including the following steps: According to Formula 1, the distance difference is obtained by combining the pin hole distance at the current ambient temperature with the stress-free length of the central cable. According to Formula 2, the reference temperature rise value is obtained in combination with the distance difference; Formula 1 is: dL=L1-L0; where L1 is the distance between the pin and the hole at the current ambient temperature, L0 is the stress-free length of the central cable, and dL is the distance difference. Formula 2 is: T = dL / dS; where dS is the change in cable-beam distance obtained when the beam end (2) is constrained to move longitudinally in the overall calculation model of the entire bridge and the overall temperature of the entire bridge rises by 1°C; T is the reference temperature rise value.

5. The method for installing the central buckle of a suspension bridge according to claim 1, wherein: 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 using a sling; the jack (700) is then lowered until the jack (700) is located between the stopper (6) and the pad 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, wherein: The longitudinal fixing devices (7) include a plurality of longitudinal fixing devices (7), and the plurality of longitudinal fixing devices (7) are evenly spaced and distributed along the transverse bridge direction of the stiffening beam (1).

8. The method for installing a central buckle of a suspension bridge according to claim 5, wherein: 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 cable using a hand chain hoist (9) includes 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); Adjust and pull the hand chain hoist (9) of the first group and the hand chain hoist (9) of the second group 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 drive in the central buckle pin shaft.

9. The method for installing a central buckle of a suspension bridge according to claim 8, wherein: 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 and the damaged part is repaired.

10. The method for installing a central buckle of a suspension bridge according to claim 1, wherein: 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) also adopts the suspension bridge central buckle installation method as claimed in claim 1.

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