CN113322834A - Method for replacing sling of suspension bridge through single-lifting-point tensioning - Google Patents
Method for replacing sling of suspension bridge through single-lifting-point tensioning Download PDFInfo
- Publication number
- CN113322834A CN113322834A CN202110404360.8A CN202110404360A CN113322834A CN 113322834 A CN113322834 A CN 113322834A CN 202110404360 A CN202110404360 A CN 202110404360A CN 113322834 A CN113322834 A CN 113322834A
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- sling
- cable
- temporary
- pin shaft
- cable clamp
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D22/00—Methods or apparatus for repairing or strengthening existing bridges ; Methods or apparatus for dismantling bridges
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/14—Towers; Anchors ; Connection of cables to bridge parts; Saddle supports
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- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D19/00—Structural or constructional details of bridges
- E01D19/16—Suspension cables; Cable clamps for suspension cables ; Pre- or post-stressed cables
Abstract
The invention relates to a sling replacing method, wherein a sling is arranged between a main cable and a box girder, the upper end and the lower end of the sling are in pin joint type, the anchor heads at the upper end and the lower end of the sling are in fork-shaped anchor heads, the tension of a temporary sling and the tension of the replaced sling are synchronously and uniformly tensioned according to grades, the tension of the replaced sling is borne by a temporary cable until the tension of the replaced sling reaches 0, a thrusting device is used for assisting in disassembling the pin joint structure at the upper end and the lower end of the replaced sling to disassemble the replaced sling, and the new sling and the temporary sling are synchronously and uniformly tensioned according to grades after being replaced by a new sling, so that the new sling is stressed.
Description
Technical Field
The invention relates to a sling replacing method of a bridge, and belongs to the technical field of bridge engineering.
Background
The suspension bridge is composed of a main cable and a sling, wherein the main cable is connected with the bridge floor through the sling, the sling bears huge tensile force, and the sling needs to be maintained and replaced in the service period of the suspension bridge so as to ensure the safety of the operation of the bridge.
In order to realize the construction of replacing the sling of the suspension bridge, the industry has better research on the replacement of the sling.
The utility model patent of publication No. CN212077663U discloses a suspension bridge sling replacement device, which comprises a sling cable clip, a box girder ear plate, a permanent sling, temporary sling connection devices arranged at both sides of the permanent sling and respectively connected with the sling cable clip and the box girder ear plate, a permanent sling carrying pole beam arranged on a permanent sling anchor cup, a counter-force beam arranged above the permanent sling carrying pole beam, the utility model provides a permanent hoist cable force applying device of setting between permanent hoist cable carrying pole roof beam and counter-force roof beam, setting are at the interim hoist cable force applying device between counter-force roof beam and interim hoist cable connecting device and be used for detecting the force application detection device of permanent hoist cable force applying device application of force size and interim hoist cable force applying device application of force size, the utility model provides a construction convenience, be convenient for construction control, to the main push-towing solution that the hoist cable of suspension bridge that the main push-towing is little, construction cost is low more changed.
The utility model patent of publication number CN212358043U discloses a long sling unloading device for a suspension bridge, which comprises a through jack, a through carrying pole beam, a cable holder, a steel strand and a bottom anchoring device; the center-through carrying pole beam comprises two bodies, wherein the bodies are provided with semicircular grooves; the bottom anchoring device is fixed on the steel box girder top plate, one end of the steel strand is fixed on the bottom anchoring device, the other end of the steel strand is fixed on the center-penetrating jack, the steel strand is controlled by the center-penetrating jack, then the sling becomes a stress-free section along the downward part of the cable holder and finishes unloading, the condition that the bottom anchoring of the sling can be removed is reached, and the unloading of the full length of the sling is finally realized by the unloading of the jack after the bottom anchoring of the sling is removed. The technical problem that the old sling with larger length can not be unloaded by adopting the conventional sling to stretch and contract the short beam cable interval is solved, and the device has the advantages of reasonable structure, clear force transmission path, safe and reliable stress and wide application range.
Temporary slings are used in the sling replacing process, and the existing temporary slings are low in operation efficiency and high in operation difficulty during field installation and tensioning installation. In addition, the top end of the sling to be replaced and the cable clamp as well as the bottom end of the sling and the pin shaft structure of the box girder ear plate are all disassembled with high operation difficulty, so that the replacement cost of the sling is very high.
Disclosure of Invention
The invention aims to provide a sling replacing method, which reduces the operation difficulty and improves the operation efficiency.
The technical scheme adopted by the invention for solving the problems is as follows: a sling replacing method is characterized in that a sling is arranged between a main cable and a box girder, the upper end and the lower end of the sling are in pin joint type, the anchor heads of the upper end and the lower end of the sling are in fork-shaped anchor heads, the temporary sling and the tensile force for unloading the replaced sling are synchronously and uniformly tensioned according to grades, the tensile force of the replaced sling is borne by the temporary sling, the force of the sling to be replaced is unloaded by a pushing device, the pin joint structure of the upper end and the lower end of the replaced sling is disassembled by an auxiliary tool to dismantle the replaced sling, and the new sling and the temporary sling are synchronously and uniformly tensioned according to grades after being replaced, so that the new sling participates in stress; the method comprises the following specific steps
(1) Design and processing of tool
(1.1) temporary cable tooling: the temporary cable clamp is installed on a main cable, the upper end of the temporary cable is anchored in the upper end anchor cup of the temporary cable, the upper end fork lug of the temporary cable is arranged on the upper portion of the upper end anchor cup of the temporary cable, and the upper end fork lug of the temporary cable is in pin joint with the temporary cable clamp through the upper end pin shaft of the temporary cable; the lower end part of the temporary cable is anchored in an anchor cup at the lower end of the temporary cable, the anchor cup at the lower end of the temporary cable is fixed on the connector, the connector is connected with a lower-end fork lug through a tension rod, and the lower-end fork lug is in pin joint with a box girder cable clamp through a lower-end pin shaft; the upper end of the tension rod penetrates through the connector and is connected to the reaction frame, and a jack and a supporting foot are installed on the tension rod between the reaction frame and the connector so as to stretch the temporary cable;
(1.2) construction platform: a movable platform, namely a hanging basket, is used as a main cable end construction platform for replacing the sling, and the hanging basket is directly arranged on the main cable and moves to the position of the sling along the main cable;
(2) preparation work before construction
(2.1) traffic control, and setting a warning sign on site;
(2.2) installing a movable hanging basket: the hanging basket is divided into three parts: the travelling device moves along the main cable, the left and right hanging baskets are hung on two sides of the travelling device, the hanging baskets are directly installed to sling positions by utilizing a steam hoist on site, after the temporary fixing, a traction winch is installed on a travelling truss by utilizing the steam hoist, the travelling truss is built on a bridge floor, two safety ropes are installed, the length of each safety rope is proper to span 3 cable clamp sections, after the hanging baskets are in place, a power supply of the hanging baskets is switched on, one ends of the traction ropes are tied on cable clamps above the hanging baskets, the hanging baskets are dragged to slowly move to working positions along the main cable by utilizing the winch installed on the hanging baskets, and finally the hanging baskets are fixed on the main cable to prevent the hanging baskets from moving or turning over;
(3) and (3) testing the initial state of the sling: measuring the initial states of the relative height difference between a main beam and a main cable of the bridge, the fundamental frequency of a sling and the length of the sling as original data;
(3) temporary rigging system installation
(3.1) installing and pre-tightening the temporary cable clamp, wherein the installing process comprises the following steps:
a, positioning a winch: arranging a winch on a pedestrian access way, welding limiting plates on four legs of the winch to ensure the firmness of the winch, and arranging a steering pulley below a main cable position where a temporary cable clamp needs to be installed;
b, mounting the upper half of the temporary cable clamp: hoisting the upper half of the temporary cable clamp to a construction platform, namely a hanging basket, by using a winch, hoisting the temporary cable clamp by using a chain block, releasing traction of the winch, adjusting the position of the cable clamp by using the chain block, and hoisting the cable clamp to an installation position for temporary fixation;
c, mounting the lower half of the temporary cable clamp: hoisting the lower half-width temporary cable clamp to a hanging basket position by using a winch, adjusting the position of the cable clamp by using a chain block, locking the upper half-width temporary cable clamp and the lower half-width temporary cable clamp on the periphery of the main cable by using a cable clamp bolt in an involutory manner, and manually pre-tightening the cable clamp bolt;
d, pre-tightening the temporary cable clamp bolt: the bolt stretcher is used for fastening the cable clamp bolt to prevent the cable clamp from sliding, and the hydraulic bolt stretcher is used for supplementing the pre-tightening force of the permanent cable clamp bolt to ensure that the pre-tightening force of the cable clamp bolt is not lower than the design pre-tightening force, so that the anti-sliding requirement of the cable clamp in the sling replacing process is met;
(3.2) installing the temporary cable and the tool, wherein the installing process comprises the following steps:
a, placing a temporary sling into a cable releasing disc by using a steam hoist, releasing one end provided with an upper fork lug, hoisting the upper fork lug section of the temporary cable to an installation position by using a winch, adjusting the position by using a chain block, and connecting the upper fork lug with a temporary cable clamp through an upper end pin shaft to complete the installation of the upper fork lug pin shaft;
b, hoisting the rest tooling of the temporary sling, installing the lower end of the sling on a box girder, installing a tension rod, connecting the upper end of the tension rod with a lower end fork lug through the lower end of a connector, connecting the lower end fork lug with an ear plate pin shaft on the box girder through a lower end pin shaft, continuously fixing the tension rod on a reaction frame after penetrating through the part above the connector, installing a jack and a supporting leg between the reaction frame and the connector, and connecting the connector with the lower anchor head of the temporary sling to finish the installation of the temporary sling;
c, after the temporary sling is installed, applying pretightening force until the temporary sling is tight and straight and the reaction frame is stable;
d, cleaning the replaced upper and lower fork lugs of the sling, the sealant and the rust on the pin shaft, and spraying a bolt loosening agent on the outer surface of the pin shaft;
(3.3) tensioning the temporary cable, wherein the tensioning process comprises the following steps:
a, measuring sling frequency and sling length before tensioning;
b, starting a jack, stretching the temporary sling in stages, and measuring the relative height difference between the main beam and the main cable, the length of the sling cable and the fundamental frequency of the sling after each stage of stretching is finished;
d 80% tensioning: tensioning the temporary sling rope until the rope force of the temporary sling rope reaches 80%, synchronously tightening a locking nut on the tensioning rod, and unloading the rope force of the replaced sling rope;
(4) dismantling the replaced sling, and dismantling the flow:
a, installing a reaction frame, a pull rod, a pushing reaction frame, a sling tensioning jack, a supporting leg and a tension rod, wherein the pushing reaction frame is installed on the sling and props against a lower anchor cup of the sling, the lower end of the tension rod is locked with the pushing reaction frame, the upper end of the tension rod is locked with the reaction frame above the tension rod, and the sling tensioning jack and the supporting leg are installed on the tension rod between the reaction frame and the pushing reaction frame; the pull rod is positioned on one side of the sling, the upper end of the pull rod is directly locked with the reaction frame, the lower end of the pull rod is locked with the fork lug, and the fork lug is connected with the lug plate pin shaft of the box girder;
b, a sling tensioning jack is used for pushing a lower anchor cup of a sling, the pushing force is the residual cable force of the sling, so that the cable force of the sling is completely unloaded, the sling is removed at the moment, a pin shaft at the lower end of the sling is knocked until the lower end of the sling is knocked out, the connection between the sling and a pin shaft of an ear plate of a box girder is removed, and a lubricant is sprayed in the knocking process of the pin shaft to help the pin shaft to be smoothly unloaded;
c, lifting the sling upwards, knocking out a pin shaft at the upper end of the sling, removing the connection between the sling and a pin shaft of an upper cable clamping lug plate of the main cable, firstly lifting out a lower anchor head of the sling, lifting an upper anchor head by a winch, slowly lowering the winch, and lowering the winch into an emergency lane of the bridge floor;
d, cleaning sealant at the joint of the box girder ear plate and the cable clamp ear plate with the sling respectively, taking out the pin shaft bushing, checking whether the ear holes of the box girder ear plate and the cable clamp ear plate are damaged, repairing the worn part and ensuring that the ear holes meet the installation requirement;
(5) installation of new slings, installation process:
a, polishing and derusting ear holes on a cable clamp and a main beam, smearing grease, and then installing a lining;
b, hoisting the upper end of a new sling rope to the position of the cradle by using a winch, adjusting the position of the upper end of the sling rope by using a chain block, adjusting the pin shaft hole of the fork ear and fork ear anchor head at the upper end of the sling rope to be concentric with the pin shaft hole of the cable clamp ear plate, installing a pin shaft and a baffle for preventing the pin shaft from falling off, and completing the pin shaft connection of the upper end of the sling rope and the cable clamp;
c, lifting the lower end of a new sling to a position higher than the reaction frame, and enabling the lower end of the sling to vertically pass through the middle gap of the reaction frame and fall to the mounting position of the box girder;
d, installing the lower end of a new sling, tensioning and installing by using a disassembly tool of the replaced sling, installing a pushing reaction frame at a lower anchor cup of the new sling, installing a tension rod between the pushing reaction frame and the reaction frame, installing a jack and a supporting leg on the tension rod between the pushing reaction frame and the reaction frame, starting the jack to push the pushing reaction frame, applying force to the anchor cup at the lower end of the new sling to pull the new sling, enabling a pin shaft hole of a fork ear anchor head at the lower end of the sling and a pin shaft hole of a box girder ear plate to be in a concentric position, installing a pin shaft, and completing the pin shaft connection of the lower end of the sling and the box girder;
e, after the new sling is replaced, tensioning the new sling in a grading manner, simultaneously releasing the pressure of the temporary sling, and repeating the tensioning process in the step (3.3) until the new sling is completely tensioned;
f, measuring the hole distance of the upper lug plate and the lower lug plate of the new suspender and the cable force of the new sling, comparing the measured values with the design requirement, and adjusting the deviation to the design requirement;
(6) and (6) removing the temporary sling.
Preferably, the work flow of step (6):
(6.1) dismantling a tension rod, a jack, a supporting leg, a reaction frame, a connector, a lower end fork lug and a lower end pin shaft of the temporary cable tool;
(6.2) removing the pin shaft connecting structure of the temporary cable and the temporary cable clamp, lowering the temporary cable by using a winch, and placing the temporary cable in a bridge deck access way area by using a cable spreading trolley;
(6.3) completing the coiling of the temporary cable;
and (6.4) sequentially removing the upper half cable clamp and the lower half cable clamp of the temporary cable clamp by using a bolt stretcher and a tension nut, and lowering the cable clamps to the area of the bridge deck access way by using a winch.
Preferably, for a replacement sling or a new sling, when the anchor cup at the lower end of the sling does not have a step structure to support the pushing reaction frame, a tapered clamp is arranged at the anchor cup of the sling and fixed on the anchor cup, and the upward end surface of the tapered clamp forms a step surface for supporting the pushing reaction frame.
Preferably, the method includes that the sling is dismantled, the pin shaft connecting mechanism is removed, the pin shaft is ejected out of the ear hole through an auxiliary tool, the auxiliary tool comprises two shaft unloading reaction frames which are arranged at intervals, a formed gap is used for accommodating the pin shaft connecting mechanism, the two shaft unloading reaction frames are mutually locked through a pull rod, an ejection jack is arranged at the end of one shaft unloading reaction frame, a top pressing ring is arranged at the end of the other shaft unloading reaction frame, the ejection jack and the top pressing ring are respectively located on two sides of the shaft hole of the pin shaft connecting mechanism, and the ejection jack can eject the pin shaft of the pin shaft connecting mechanism into the inner hole of the top pressing ring from the shaft hole so as to achieve removal of the pin shaft connecting mechanism.
Furthermore, the shaft unloading reaction frames are provided with inner end faces and outer end faces, the inner end faces of the two shaft unloading reaction frames are opposite, and the pin shaft connecting mechanism is located between the two inner end faces.
Furthermore, the two unloading shaft reaction frames are mutually locked through a plurality of pull rods.
Drawings
FIG. 1 is a flow chart of sling replacement according to an embodiment of the present invention;
FIG. 2 is a schematic view of the mounting of a hanging basket in an embodiment of the present invention;
FIG. 3 is a schematic diagram of the operation of the cradle according to the embodiment of the present invention;
FIG. 4 is a schematic view of the upper half of the temporary cleat of the present invention;
FIG. 5 is a schematic view of the installation of the lower half of the temporary cable clamp in an embodiment of the present invention;
FIG. 6 is a schematic view of the installation of the upper end of a temporary cable in an embodiment of the present invention;
FIG. 7 is a schematic installation diagram of a temporary cable tensioning tool in an embodiment of the invention;
FIG. 8 is a schematic mounting diagram of a sling dismounting tool in an embodiment of the invention;
FIG. 9 is a cross-sectional view BB of FIG. 8;
FIG. 10 is a cross-sectional view CC of FIG. 8;
FIG. 11 is a top view of the tapered clamp;
FIG. 12 is a cross-sectional view AA in FIG. 11;
fig. 13 is a schematic view of a boring operation of the boring machine in embodiment 2 of the present invention;
FIG. 14 is a front view of a jig dedicated to an ear plate in embodiment 2 of the present invention;
FIG. 15 is a left side view of an ear panel-only clip in an embodiment of the present invention;
FIG. 16 is a horizontal cross-sectional view of a static load test structure in example 2 of the present invention;
FIG. 17 is a vertical sectional view of a static load test structure in example 2 of the present invention;
FIG. 18 is a schematic view of the construction of the temporary cord clip;
FIG. 19 is a side view of the structure shown in FIG. 18;
FIG. 20 is an operation diagram of an auxiliary tool in embodiment 3;
FIG. 21 is a plan view of an auxiliary tool in embodiment 3;
FIG. 22 is a state diagram of the working site of the auxiliary tool in embodiment 3;
in the figure, a lug hole 1, a hole boring cutter 2, a hole boring machine rotating shaft 3, a welding part 4, a lug plate 5, a fixing clamp 6, a positioning clamp 7, a positioning beam 8, a connecting plate 9, a test lug plate 10, a pin shaft 11, a fork lug 12, a nut 13, a temporary cable clamp 14, a temporary cable 15, a reaction frame 16, a tension rod 17, a jack 18, a supporting leg 19, a fork lug at the lower end 20, a pull rod 21, a pushing reaction frame 22, a connector 23, a shaft unloading reaction frame 24, a shaft unloading jack 25, a press ring 26, a locking pull rod 27 and a pin shaft connecting mechanism 28 are connected.
Detailed Description
The present invention will be described in further detail below with reference to the attached drawings, which are illustrative and are not to be construed as limiting the invention. The description of the present embodiment is corresponding to the accompanying drawings, and the description related to the orientation is also based on the description of the accompanying drawings, and should not be construed as limiting the scope of the present invention.
Example 1
1. Overview of the engineering
Taking a certain bridge as an example, the main bridge is a three-tower two-span suspension bridge, the full bridge comprises 2 main cables, the main cables adopt prefabricated parallel steel wire strands, each main cable comprises 154 strands, each strand comprises 91 galvanized high-strength steel wires with the diameter of 5.2mm, the standard tensile strength of the steel wires is not less than 1770MPa, and the stress-free length of a single cable strand is 3050 m.
The sling adopts a prefabricated parallel steel wire lock, the outside of the sling body is extruded with double-protection layer PE with the thickness of 8.0mm for protection, the inner layer of the PE is black, and the outer layer is colored. Steel wire is adopted
Galvanized high-strength steel wireAnd the standard tensile strength of the steel wire is not less than 1670 MPa. The suspension cable adopts a pin joint type, each lifting point is provided with 2 suspension cables, the anchor heads at the upper end and the lower end of the suspension cable all adopt fork-shaped hot-cast anchor heads, and the number of the full bridges is 528.
2. Engineering content
According to the field use condition of the bridge sling, the NY118-1 sling is replaced by the project. The sling is characterized in that:
NY118-1 sling condition meter
3. Main equipment and auxiliary material
Equipment input condition table
4. Schedule for construction period
Schedule for replacement period of NY118-1 sling
| Serial number | | Scheduling | |
| 1 | Preparation for |
5 |
|
| 2 | Temporary |
5 |
|
| 3 | Tensioning temporary sling, removing old sling and pushing | 4 |
|
| 4 | Removal of |
4 |
|
| 5 | |
3 |
|
| 6 | |
3 |
|
| 7 | |
5 days | |
| Total up to | 30 days |
5. Sling replacement scheme
5.1 Sling replacement Process flow, as shown in FIG. 1.
5.2 Sling replacement protocol
5.2.1 replacement method
According to the requirement of a monitoring instruction, the temporary slings are synchronously tensioned to 100% tension force in a grading manner, the jacking reaction frame is utilized to jack the slings to be replaced to a dismantling state, and the new slings are replaced and then are synchronously unloaded uniformly in a grading manner, so that the new slings participate in stress.
5.2.2 tool design and processing
1) Temporary rigging selection
Considering the existing tensioning tool condition and the actual field replacement working condition, the temporary cable with the specification of 6.59-127 is selected through the schematic layout of the temporary sling system, and the breaking cable force is 6892 KN.
According to the preliminary calculation of monitoring, the biggest tensile force of interim hoist cable when hoist cable is changed is 1514.6KN, and the top pushes away hoist cable power and is 615.374KN, carries out the check calculation through the tensile force. The stress calculation results of each member are as follows:
2) construction platform
Because the hoist cable is about 45 meters apart from the bridge floor, ground clearance is high, considers the security and the convenience of construction, adopts portable platform (hanging the basket) as the main push-towing rope end construction platform that the hoist cable was changed. The hanging basket is assembled by galvanized steel pipes, each connecting part must be welded reliably, and after welding is completed, a loading experiment is carried out, and the hanging basket can be put into use on site after being qualified.
5.2.3 preparation before construction
1) Traffic control and warning signs
And closing the third lane, and separating the construction lane from the closed area by using a conical barrel.
(1) Device configuration
a. The department of project is provided with 1 patrol vehicle, 1 light truck (transportation sign, assistance of on-site safety patrol), a plurality of red flags and 2 flashlights.
b. And personnel and emergency traffic cones are equipped on the construction site of the project department.
(2) Identification label equipment
2) Movable hanging basket installation
Because the hanging basket is bigger, in order to facilitate transportation, the hanging basket is divided into 3 parts (namely a left hanging basket and a right hanging basket and a walking device), and after a transport vehicle is transported to the bridge floor, the construction and assembly of the hanging basket are completed on a third lane by utilizing steam lifting.
According to the field condition, in order to reduce the moving distance, the 25K5 steam hoist is rented according to the field plan, the hanging basket is directly installed to the cable clamp position, and after the hanging basket is temporarily fixed, the hoisting machine for traction is installed to the walking truss through the steam hoist. Two safety ropes are installed, and the length of each safety rope preferably spans the distance of 3 cable clamp sections.
After the cradle is in place, a cradle power supply is connected, one end of a traction steel wire rope is tied to a cable clamp above the cradle, the cradle is dragged to slowly move to a working position by using a winch arranged on the cradle, and the cradle is fixed on a main cable to prevent the cradle from moving or turning on one side.
3) Initial state test of unit sling matched with monitoring
According to the requirements of the monitoring scheme, the initial states of the main beam and the main cable, the fundamental frequency of the sling, the length of the sling and the like are measured by matching with a monitoring unit and are used as original data
5.2.4 temporary Sling System installation
1) Temporary cable clamp installation and pretension
(1) The installation method comprises the following steps: the device is installed by using a winch and a chain block.
(2) Installation process:
a, positioning a winch: the 5t winch is arranged on a pedestrian access way, limiting plates are welded on four legs of the winch to ensure the firmness of the winch, and a steering pulley is arranged below a temporary cable clamp needing to be installed. In order to prevent the steel wire rope from polluting the main cable, the steel wire rope of the winch adopts a galvanized steel wire rope.
b, mounting the upper half of the temporary cable clamp: and hoisting the upper half temporary cable clamp to the position of the construction platform by using a winch. And hoisting the cable clamp by using the chain block, releasing a steel wire rope of the winch, adjusting the position of the cable clamp by using the chain block, and hoisting the cable clamp to the mounting position for temporary fixation.
c, mounting the lower half of the temporary cable clamp: and hoisting the lower half-width temporary cable clamp to the position of the hanging basket by using a winch, adjusting the position of the cable clamp by using a chain block, installing a cable clamp bolt to oppositely lock the upper half-width temporary cable clamp and the lower half-width temporary cable clamp on the periphery of the main cable, and manually pre-tightening the cable clamp bolt.
d, pre-tightening the temporary cable clamp bolt: utilize bolt elongator to fasten the cable clamp bolt, prevent that the cable clamp from sliding. The hydraulic bolt tensioner is adopted to supplement the pre-tightening force of the permanent cable clamp bolt, so that the pre-tightening force of the cable clamp bolt is not lower than the design pre-tightening force, and the requirement of the cable clamp on anti-sliding during the replacement process of the sling is met.
2) Temporary cable and tool installation
a, placing a temporary sling into a cable releasing disc by using a steam hoist, releasing an upper fork lug, hoisting a temporary sling fork lug section to a mounting position by using a winch, and adjusting by using a 3t chain block to complete the mounting of an upper fork lug pin shaft.
b, installing a temporary cable tool on the beam surface fork ear plate through the truck crane, installing a tension rod, and connecting the conversion device, namely the connector, with the lower anchor head of the temporary sling to complete the installation of the temporary cable.
c, after the temporary sling is installed, applying a pretightening force of about 20t until the temporary sling is tightened and straightened, and the reaction frame is stable.
d, cleaning and replacing the upper fork lug and the lower fork lug of the sling rope and the sealant and the iron rust on the pin shaft, and spraying a bolt loosening agent on the outer surface of the pin shaft to facilitate the smooth disassembly of the subsequent pin shaft.
3) Temporary cable system tensioning
a, before tensioning, the frequency of the sling and the length of the sling are measured by matching with a monitoring unit.
And b, synchronously starting the oil pump jack according to the monitoring instruction, stretching the temporary sling in stages, and measuring the relative height difference between the main beam and the main cable, the length of the sling cable and the fundamental frequency of the sling cable by matching a monitoring unit after each stage of stretching is finished.
d 80% tensioning: and the cable force of the temporary sling reaches 992.4KN, the locking nut on the pull rod is synchronously tightened, the distance between the cable beams is reduced by 28.99mm, and the cable force of the NY118-1 sling is 685.449 KN.
5.5.5 original Sling removal
a reaction frame, M98 pull rods (two) and a pushing reaction frame, a sling tensioning jack, a supporting foot and a tensioning pull rod (two) are arranged on the original sling to form a pushing tool of the old sling.
b, pushing the NY118-1 sling lower anchor cup by using a pushing tool, wherein the pushing force is 615.374KN, the sling force is completely unloaded, the NY-118-1 sling is disassembled, and the sling lower pin shaft is continuously knocked until the sling lower pin shaft is knocked out. Spraying a lubricant in the knocking process of the pin shaft to help the pin shaft to be smoothly discharged; in the process, the cable force of the NY118-1 sling is released, the displacement of 65.54mm is released, the cable force of the temporary sling is 1514.6KN, and the cable force of the NY118-2 sling is 749.1 KN.
c, lifting the old cable, knocking out a pin shaft in an upper lug plate of the old cable, taking out a lower anchor head of the old cable by using a steam crane, hanging the upper anchor head by using a winch, slowly lowering the winch, and using the steam crane to assist the old cable to be lowered into an emergency lane on the bridge floor.
And d, treating sealant at the joint of the box girder and the cable clamp lug plate, taking out the pin shaft bushing, checking whether the lug hole of the lug plate fork is damaged or not, repairing the worn part and ensuring that the pin shaft hole meets the installation requirement. And installing a new bushing by utilizing a tool.
5.2.6 New Sling installation
a, polishing and derusting fork holes in the cable clamp and the main beam, smearing grease, and then installing a lining.
And b, hoisting an upper fork lug (an upper fork lug anchor head) of the new cable to a hanging basket position by using a winch through steam hoisting, adjusting the position of the upper fork lug by using a chain block, and installing a pin shaft and a baffle (for preventing the pin shaft from being separated) when the pin shaft hole of the upper fork lug and the pin shaft hole of the cable clamp are in the concentric position to complete the installation of the upper fork lug.
And c, lifting a lower fork lug (a lower fork lug anchor head) at the bottom of the sling to a position higher than a reaction frame of the cable replacing tool by using a steam crane, so that the lower fork lug vertically passes through a gap between the two reaction frames and falls to a mounting position, namely a box girder ear plate position.
d, mounting the lower fork lug by using the original pin shaft dismounting tool to stretch and mount, mounting a pushing tool, pushing a reaction frame by using a jack, applying force to the lower anchor cup to pull a new cable, and mounting an upper pin shaft when the pin shaft hole of the lower fork lug of the sling and the pin shaft hole of the box girder ear plate are in a concentric position to finish mounting of the lower fork lug. Specifically, the method can also be understood as that a pushing device is installed on a new sling, the new sling is pushed by means of graded tensioning according to the reverse process of old sling dismantling, the temporary sling is unloaded synchronously and graded by 100KN at each grade until a new sling fork lug pin shaft hole and a main beam pin shaft hole are concentric, and a pin shaft is installed. It should be noted that when the sling adopts a product with a smooth transition between the anchor cup and the connecting cylinder, because the end part of the anchor cup has no convex step structure, the pushing reaction frame can not be reliably butted with the anchor cup, an auxiliary conical clamp tool is needed, the conical clamp is of a Harvard structure and is arranged at the outer end of the anchor cup in an involutive manner, the step structure is provided by the conical clamp, so as to support the pushing reaction frame,
and e, after the new sling is replaced, releasing the pressure of the temporary sling, loosening the nut on the main pull rod, and repeating the operation until the new sling is completely tensioned.
f, matching with a monitoring unit to measure the hole distance of the upper lug plate and the lower lug plate of the new suspender and the cable force of the new suspender, and if the deviation is larger than the design requirement, adjusting until the requirement is met.
5.2.7 removal of temporary cables, baskets, etc
1) Removing a tensioning tool of the temporary station by using the chain block;
2) removing a pin shaft at the upper end of the temporary sling, lowering the temporary sling by using a winch, and placing the temporary sling in the bridge deck access way area by using a cable-spreading trolley;
3) completing the coiling of the temporary sling with the aid of a crane;
4) and (3) loosening the nut by using a bolt stretcher, sequentially detaching the lower cable clamp and the upper cable clamp, and lowering the cable clamp to the bridge deck maintenance way area by using a winch.
Example 2
Description of the invention
The material of the sling cable clamp and the steel beam ear plate is ZG270-500 Mn and 16Mn respectively. Aiming at the current situation of the bridge pin hole: the wear depth of one side of the inner hole is near 10mm, and the inner hole is half-moon-shaped.
Second, repair scheme
In order to ensure the stress safety of the sling and the pin shaft at the later stage, the worn shaft hole needs to be repaired, and a welding repair scheme is planned to be adopted for repairing through organization discussion, and the basic idea is as follows:
1) ear hole treatment
And (4) carrying out oil removal and cleaning treatment according to the actual ear hole condition.
2) Heating of
(1) After the pin holes are degreased and cleaned, heating the whole pin holes at positions needing to be welded;
(2) heating the upper end ear hole and the lower end ear hole, detecting the temperature, and finishing heating when the temperature is 200-300 ℃;
(3) immediately after heating, the temperature is kept by the heat preservation material, and the temperature is controlled to be (200 +/-10).
3) Repair welding
And measuring the temperature of the welding part before repair welding, and starting repair welding after the temperature meets the temperature of (200 +/-10) DEG C. The repair welding requirements are as follows:
(1) the welding is carried out on a sunny day or a cloudy day with the temperature of more than-1 ℃, the welding heat preservation time is rapidly reduced due to the over-low temperature during the welding, and meanwhile, the welding hardness is improved, so that the welding standard and the welding requirement cannot be met.
(2) The repair welding material and the repair welding part need to be kept consistent, and the material matched with the original material in the same way is adopted. The upper ear hole is ZG270-500 with tensile strength not lower than 500MPa and yield strength not lower than 270 MPa. The rating of the welding area is not lower than the 3 grades specified in the classification method of steel casting radiography and negative plate (GB/T5677-1985); repair welding with CO2The gas protection cover and the welding repair standard reach the standard specified in valve pressed steel casting radiographic inspection (GB/T6440-2008). The lower end ear hole is made of 16Mn, adopting CO for ensuring welding quality2The gas protection cover and the repair welding standard reach the standard specified in the pressure vessel welding regulations (NB/T47015-.
(3) The height and the area of repair welding are determined according to the actual wear condition of the ear hole, the number of welding layers is judged after the ear hole is cleaned, and the size is controlled on the basis of the machining amount with 3-5mm allowance in the ear hole in principle.
(4) Repair welding needs to be carried out in sequence along the aperture direction, repair welding is carried out by a welder with abundant qualification and experience, welding is ensured to be uniform and compact, obvious missing welding and gaps cannot exist, after repair welding, heat insulation is carried out by adopting a heat insulation material (dried asbestos cloth), the heat insulation temperature is (200 +/-10) DEG C, and the heat insulation time is about one hour.
4) Heat preservation
After the heat preservation is finished, opening and dismantling the heat preservation device, cooling to (60 +/-10) DEG C along with air, and processing the aperture;
5) boring hole
In order to ensure the diameter size of the pin hole, the inner wall of the pin hole is bored,
boring operation:
(1) two sets of different special fixtures are adopted to control the bore hole verticality according to the form design of the upper end ear hole and the lower end ear hole, and the concentricity is ensured.
(2) The feed amount is adjusted in a stepless speed change manner by adopting a motor, so that the requirement of the roughness of a design drawing (the roughness is 6.3s except for a machined surface) is met;
(3) polishing the surface of the inner hole by using a polishing machine after boring, wherein the diameter of the pin hole reaches 110(+ 0.3-0.0) mm and meets the requirement of a design drawing;
(4) after boring, performing anticorrosive coating on the inner hole of the lug hole, wherein the thickness is 10 mu m;
6) acceptance of size
And after boring is finished, detecting each hole, and after the size is qualified, comprehensively performing UT-ultrasonic flaw detection and PT-penetration flaw detection on the pin hole and the lug plate surface.
Flaw detection requirements are as follows:
(1) the upper end ear hole and the ear plate need to meet the 1 st part of ultrasonic detection of steel castings: the ultrasonic flaw detection is carried out on the requirements of general purpose steel castings (GB/T7233.1-2009), and the grade 2 is qualified; the requirements of the penetration test of the steel castings (GB/T9443-.
(2) The lower end ear hole and the ear plate need to meet the requirement of thick steel plate ultrasonic inspection method (GB/T2970-; the penetration inspection is carried out according to the requirements of the nondestructive penetration inspection (GB/T9218-2007), and the A level is qualified.
(3) If the flaw detection is unqualified, the unqualified area is treated, then the preheating, repair welding, heat preservation and boring are carried out again strictly according to the processes, and then the UT-ultrasonic flaw detection and the PT-penetration flaw detection are carried out until the detection is qualified.
And (4) after all the procedures are qualified, mounting the bushing.
Third, test verification
Because this scheme has not carried out repair work of this scale on old bridge yet, in order to ensure to be all the same, need adopt the cable clip and the girder steel otic placode of the same material to develop 2 groups according to above repair scheme: four otic placodes, each two of every kind of material, one-to-one model welding repair test, the welding is accomplished and is carried out the otic placode after through the inspection and to drawing the static strength test, records final strength and destruction form, and final strength should guarantee not less than 95% of hoist cable nominal load, static load test parameter: starting from 0.1Pb, the loading rate is not more than 100 MPa/min, gradually increasing 0.1Pb and holding the load for 2 minutes in each stage, gradually loading to 0.5Pb, continuing to load after holding the load for 10 minutes, gradually increasing 0.05Pb in each stage and holding the load for 2 minutes until the load is not less than 0.95 Pb.
In addition, a normal set of cable clamps and steel beam lugs was prepared and subjected to the same tensile static load test, and the final strength and failure form were measured. The static load test is shown in fig. 16 and 17.
And (4) evaluating the tissue welding repair scheme after the test, and performing real bridge repair after the test is passed.
Example 3
In order to improve the working efficiency and reduce the working strength, the embodiment provides an auxiliary tool for disassembling the pin shaft connecting mechanism, which comprises two shaft unloading reaction frames, wherein the two shaft unloading reaction frames are arranged at intervals up and down, each shaft unloading reaction frame 24 is provided with an inner end surface and an outer end surface, the inner end surfaces of the two shaft unloading reaction frames 24 in the vertical direction are opposite, and a gap formed by the two parallel inner end surfaces is used for accommodating the pin shaft connecting mechanism 28, such as a pin shaft connecting mechanism of an ear plate and a fork ear. The outer end face is formed by two inclined planes and is in a roof shape or an arch shape.
The upper and lower unloading shaft reaction frames 24 are locked with each other through three locking pull rods 27, namely a large pull rod and two small pull rods, wherein the large pull rod is used for connecting the middle parts of the two unloading shaft reaction frames, and the two small pull rods are used for connecting the right ends of the two unloading shaft reaction frames.
A shaft unloading jack 25 is provided at the left end of the upper shaft unloading reaction frame 24, and the shaft unloading jack 25 can push downward. The left end part of the lower shaft unloading reaction frame 24 is provided with a top pressing ring 26, the top pressing ring 26 is arranged on the inner end surface, and an inner hole of the top pressing ring 26 penetrates through the inner end surface of the shaft unloading reaction frame 24. The pin shaft connecting mechanism 28 is supported on the end face of the top pressure ring 26, and the shaft hole of the pin shaft connecting mechanism 28 is axially communicated with the inner hole of the top pressure ring 26. The shaft unloading jack 25 and the jacking ring 26 are vertically corresponding, and the shaft unloading jack 25 can jack the pin shaft of the pin shaft connecting mechanism 28 into the inner hole of the jacking ring 26 from the shaft hole so as to realize the disassembly of the pin shaft connecting mechanism 28.
In addition to the above embodiments, the present invention also includes other embodiments, and any technical solutions formed by equivalent transformation or equivalent replacement should fall within the scope of the claims of the present invention.
Claims (7)
1. A sling replacing method is characterized in that a sling is arranged between a main cable and a box girder, the upper end and the lower end of the sling are in pin joint type, the anchor heads of the upper end and the lower end of the sling are in fork-shaped anchor heads, the temporary sling and the tensile force for unloading the replaced sling are synchronously and uniformly tensioned according to grades, the tensile force of the replaced sling is borne by a temporary cable until the tensile force of the replaced sling reaches 0, a pin joint structure of the upper end and the lower end of the replaced sling is disassembled by using a pushing device to remove the replaced sling, and the new sling and the unloaded temporary sling are synchronously and uniformly tensioned according to grades after a new sling is replaced, so that the new sling participates in stress;
the method is characterized in that: the steps are as follows
(1) Design and processing of tool
(1.1) temporary cable tooling: the temporary cable clamp is installed on a main cable, the upper end of the temporary cable is anchored in the upper end anchor cup of the temporary cable, the upper end fork lug of the temporary cable is arranged on the upper portion of the upper end anchor cup of the temporary cable, and the upper end fork lug of the temporary cable is in pin joint with the temporary cable clamp through the upper end pin shaft of the temporary cable; the lower end part of the temporary cable is anchored in an anchor cup at the lower end of the temporary cable, the anchor cup at the lower end of the temporary cable is fixed on the connector, the connector is connected with a lower-end fork lug through a tension rod, and the lower-end fork lug is in pin joint with a box girder cable clamp through a lower-end pin shaft; the upper end of the tension rod penetrates through the connector and is connected to the reaction frame, and a jack and a supporting foot are installed on the tension rod between the reaction frame and the connector so as to stretch the temporary cable;
(1.2) construction platform: a movable platform, namely a hanging basket, is used as a main cable end construction platform for replacing the sling, and the hanging basket is directly arranged on the main cable and moves to the position of the sling along the main cable;
(2) preparation work before construction
(2.1) traffic control, and setting a warning sign on site;
(2.2) installing a movable hanging basket: the hanging basket is divided into three parts: the travelling device moves along the main cable, the left and right hanging baskets are hung on two sides of the travelling device, the hanging baskets are directly installed to sling positions by utilizing a steam hoist on site, after the temporary fixing, a traction winch is installed on a travelling truss by utilizing the steam hoist, the travelling truss is built on a bridge floor in advance, two safety ropes are installed, the length of each safety rope is proper to span 3 cable clamp sections, after the hanging baskets are in place, a power supply of the hanging baskets is switched on, one ends of the traction ropes are tied on cable clamps above the hanging baskets, the hanging baskets are dragged to slowly move to working positions along the main cable by utilizing the winch installed on the hanging baskets, and finally the hanging baskets are fixed on the main cable to prevent the hanging baskets from moving or turning over;
(2.3) initial state test of the sling: measuring the initial states of the relative height difference between a main beam and a main cable of the bridge, the fundamental frequency of a sling and the length of the sling as original data;
(3) temporary rigging system installation
(3.1) installing and pre-tightening the temporary cable clamp, wherein the installing process comprises the following steps:
a, positioning a winch: arranging a winch on a bridge floor, and arranging a steering pulley below a main cable position where a temporary cable clamp needs to be installed;
b, mounting the upper half of the temporary cable clamp: hoisting the upper half temporary cable clamp to a construction platform, namely a hanging basket, by using a winch, hoisting the temporary cable clamp, releasing the traction of the upper half temporary cable clamp of the winch, adjusting the position of the upper half temporary cable clamp, and hoisting the upper half temporary cable clamp to an installation position for temporary fixation;
c, mounting the lower half of the temporary cable clamp: hoisting the lower half-width temporary cable clamp to a hanging basket position by using a winch, adjusting the position of the cable clamp, closing and locking the upper half-width temporary cable clamp and the lower half-width temporary cable clamp on the periphery of the main cable by using a cable clamp bolt, and pre-tightening the cable clamp bolt;
d, pre-tightening the temporary cable clamp bolt: fastening the cable clamp bolt to prevent the cable clamp from sliding, and continuously supplementing the pre-tightening force of the permanent cable clamp bolt to ensure that the pre-tightening force of the cable clamp bolt is not lower than the design pre-tightening force, thereby meeting the anti-sliding requirement of the cable clamp in the sling replacing process;
(3.2) installing the temporary cable and the tool, wherein the installing process comprises the following steps:
a, placing a temporary sling into a cable releasing disc by using a steam hoist, releasing one end provided with an upper end fork lug, hoisting the upper end fork lug section of the temporary cable to an installation position by using a winch, adjusting the position of the temporary cable, and connecting the upper end fork lug of the temporary cable with a temporary cable clamp through an upper end pin shaft to complete the installation of the upper end fork lug pin shaft;
b, hoisting the rest tooling of the temporary cable, installing the lower end of the temporary cable on the box girder, installing a tension rod, connecting the upper end of the tension rod with a lower end fork lug through the lower end of a connector, connecting the lower end fork lug with an ear plate pin shaft on the box girder through a lower end pin shaft, continuously fixing the tension rod on a reaction frame after penetrating through the part above the connector, installing a jack and a supporting leg between the reaction frame and the connector, and connecting the connector with a lower anchor head of the temporary sling cable to finish the installation of the temporary cable;
c, after the temporary sling is installed, applying pretightening force until the temporary sling is tight and straight and the reaction frame is stable;
d, cleaning the replaced upper and lower fork lugs of the sling, the sealant and the rust on the pin shaft, and spraying a bolt loosening agent on the outer surface of the pin shaft;
(3.3) tensioning the temporary cable, wherein the tensioning process comprises the following steps:
a, measuring sling frequency and sling length before tensioning;
b, starting a jack, stretching the temporary sling in stages, and measuring the relative height difference between the main beam and the main cable, the length of the sling cable and the fundamental frequency of the sling after each stage of stretching is finished;
c 50% tensioning: tensioning the temporary sling rope until the rope force of the temporary sling rope reaches 50% of the working rope force, synchronously tightening a locking nut on the tensioning rod, and unloading the rope force of the replaced sling rope;
d 80% tensioning: tensioning the temporary sling rope until the rope force of the temporary sling rope reaches 80%, synchronously tightening a locking nut on the tensioning rod, and unloading the rope force of the replaced sling rope;
e 100% tensioning: tensioning the temporary sling to reach 100% of the working cable force, synchronously tightening the locking nut on the tensioning rod, unloading the replaced sling at the same time, and keeping the cable force of the replaced sling not to be 0 and still keeping a certain cable force;
(4) dismantling the replaced sling, and dismantling the flow:
a, installing a reaction frame, a pull rod, a pushing reaction frame, a sling tensioning jack, a supporting leg and a tension rod, wherein the pushing reaction frame is installed on the sling and props against a lower anchor cup of the sling, the lower end of the tension rod is locked with the pushing reaction frame, the upper end of the tension rod is locked with the reaction frame above the tension rod, and the sling tensioning jack and the supporting leg are installed on the tension rod between the reaction frame and the pushing reaction frame; the pull rod is positioned on one side of the sling, the upper end of the pull rod is directly locked with the reaction frame, the lower end of the pull rod is locked with the fork lug, and the fork lug is connected with the lug plate pin shaft of the box girder;
b, a sling tensioning jack is used for pushing a lower anchor cup of a sling, the pushing force is the residual cable force of the sling, so that the cable force of the sling is completely unloaded, the sling is removed at the moment, a pin shaft at the lower end of the sling is knocked until the lower end of the sling is knocked out, the connection between the sling and a pin shaft of an ear plate of a box girder is removed, and a lubricant is sprayed in the knocking process of the pin shaft to help the pin shaft to be smoothly unloaded;
c, lifting the sling upwards, knocking out a pin shaft at the upper end of the sling, removing the connection between the sling and a pin shaft of an upper cable clamping lug plate of the main cable, firstly lifting out a lower anchor head of the sling, lifting an upper anchor head by a winch, slowly lowering the winch, and lowering the winch into an emergency lane of the bridge floor;
d, cleaning sealant at the joint of the box girder ear plate and the cable clamp ear plate with the sling respectively, taking out the pin shaft bushing, checking whether the ear holes of the box girder ear plate and the cable clamp ear plate are damaged, repairing the worn part and ensuring that the ear holes meet the installation requirement;
(5) installation of new slings, installation process:
a, polishing and derusting ear holes on a cable clamp and a main beam, smearing grease, and then installing a lining;
b, hoisting the upper end of a new sling to the position of the cradle by using a winch, then adjusting the position of the upper end of the sling, adjusting the pin shaft hole of the fork lug anchor head at the upper end of the sling to be concentric with the pin shaft hole of the lug plate of the cable clamp, installing a pin shaft and a baffle for preventing the pin shaft from falling off, and completing the pin shaft connection of the upper end of the sling and the cable clamp;
c, lifting the lower end of a new sling to a position higher than the reaction frame, and enabling the lower end of the sling to vertically pass through the middle gap of the reaction frame and fall to the mounting position of the box girder;
d, installing the lower end of a new sling, tensioning and installing by using a disassembly tool of the replaced sling, installing a pushing reaction frame at a lower anchor cup of the new sling, installing a tension rod between the pushing reaction frame and the reaction frame, installing a jack and a supporting leg on the tension rod between the pushing reaction frame and the reaction frame, starting the jack to push the pushing reaction frame, applying force to the anchor cup at the lower end of the new sling to pull the new sling, enabling a pin shaft hole of a fork ear anchor head at the lower end of the sling and a pin shaft hole of a box girder ear plate to be in a concentric position, installing a pin shaft, and completing the pin shaft connection of the lower end of the sling and the box girder;
e, after the new sling is replaced, tensioning the new sling in a grading manner, simultaneously releasing the pressure of the temporary sling, and repeating the tensioning process in the step (3.3) until the new sling is completely tensioned;
f, measuring the hole distance of the upper lug plate and the lower lug plate of the new suspender and the cable force of the new sling, comparing the measured values with the design requirement, and adjusting the deviation to the design requirement;
(6) and (6) removing the temporary sling.
2. The method of claim 1, wherein: in the step d of the step (4), the repair method of the ear holes of the cable clamp ear plate and the box girder ear plate comprises the following steps:
treatment of earhole
Carrying out oil removal and cleaning treatment according to the actual ear hole condition;
(II) heating
(2.1) after the pin holes are degreased and cleaned, heating the whole lug plates of the pin holes to be welded;
(2.2) heating the cable clamp and the lug plate of the box girder and simultaneously detecting the temperature, wherein when the temperature reaches 200-300 ℃, the heating is finished;
(2.3) immediately after heating, winding heat insulation materials along the two ends of the ear plate, and sealing the two ends of the ear hole to realize heat insulation, wherein the temperature of the ear plate is controlled to be 200 +/-10 ℃;
(III) repair welding
The temperature of a part to be welded is measured before repair welding, the part to be welded refers to a worn part in an earhole, repair welding is started when the temperature condition of 200 +/-10 ℃ is met, and the repair welding requirements are as follows:
(3.1) welding is carried out on a sunny day or a cloudy day with the temperature higher than-1 ℃, the welding heat preservation time is rapidly reduced due to too low temperature during welding, and meanwhile, the welding hardness is improved, so that the welding standard and the welding requirement cannot be met;
(3.2) the material of the repair welding material is consistent with that of the repair welding part, the material matched with the original material is adopted, and the evaluation grade of the welding area is not lower than the 3 grades specified in the steel casting radiographic and negative plate grade classification method (GB/T5677-1985);
(3.3) the height and the area of repair welding are determined according to the actual wear condition of the ear hole, the number of welding layers is judged after the cleaning of the ear hole is finished, and the welding size is controlled to be based on the machining amount with 3-5mm allowance in the ear hole in principle;
(3.4) repair welding needs to be carried out in sequence along the aperture direction, welding repair needs to ensure even and compact welding, obvious missing welding and gaps cannot exist, heat insulation materials are adopted for heat insulation after repair welding, the heat insulation temperature is 200 +/-10 ℃, and the heat insulation time is more than one hour;
(IV) Heat preservation
After the heat preservation is finished, opening and removing the heat preservation material, and cooling the heat preservation material to below 60 +/-10 ℃ along with air to process the aperture;
(V) boring
In order to ensure the diameter size of the pin hole, the pin hole is bored,
boring operation:
(5.1) according to the design of the ear hole form, adopting a corresponding special fixture to control the verticality of the boring hole in a centering manner, ensuring the concentricity, the circumferential boring hole and the ear hole to be concentric, specifically, the special fixture for the ear plate comprises a fixing fixture, a positioning fixture and a positioning beam, wherein the fixing fixture comprises a front clamping plate and a rear clamping plate which are parallel to each other and arranged at intervals, the ear plate is arranged between the front clamping plate and the rear clamping plate and is locked by a plurality of fasteners, the front clamping plate and the rear clamping plate are respectively provided with positioning holes, the positioning holes correspond to the ear holes of the ear plate, and at least the positioning holes are ensured to be completely exposed out of the ear holes; the positioning clamps are welded on two sides of the fixing clamp, the positioning beam is welded with the fixing clamp and extends forwards and backwards, and the positioning beam is used for mounting a boring machine, so that the rotating shaft and the earhole of the boring machine can be conveniently and quickly positioned concentrically;
(5.2) adopting a motor to adjust the feed amount in a stepless speed change way, and meeting the roughness requirement of the design drawing: removing the machined surface, wherein the roughness is 6.3 s;
(5.3) polishing the surface of the inner hole after boring, wherein the error of the diameter of the pin hole reaches (+ 0.3-0.0) mm and meets the requirement of a design drawing;
(5.4) after boring, performing anticorrosive coating on the inner hole of the lug hole, wherein the thickness is more than 10 mu m;
(VI) acceptance of size
After boring, detecting the size of the hole, and after the size is accepted, carrying out flaw detection on the earhole and the earplate surface;
the flaw detection requirements are met:
the flaw detection of the cable clamp shaft hole and the lug plate needs to meet the 1 st part of the ultrasonic detection of the steel casting: the ultrasonic flaw detection is carried out on the requirements of general purpose steel castings (GB/T7233.1-2009), and the grade 2 is qualified; carrying out penetrant inspection according to the requirements of the penetrant inspection of steel castings (GB/T9443-;
the flaw detection of the box girder ear hole and the ear plate needs to meet the requirement of a thick steel plate ultrasonic inspection method (GB/T2970-; carrying out penetration inspection according to the requirements of nondestructive penetration inspection (GB/T9218 and 2007), and ensuring that the A level is qualified;
if the flaw detection is unqualified, carrying out preheating, repair welding, heat preservation and boring on an unqualified area according to the process, and then carrying out flaw detection until the detection is qualified.
3. The method of claim 1, wherein: the operation flow of the step (6):
(6.1) dismantling a tension rod, a jack, a supporting leg, a reaction frame, a connector, a lower end fork lug and a lower end pin shaft of the temporary cable tool;
(6.2) removing the pin shaft connecting structure of the temporary cable and the temporary cable clamp, lowering the temporary cable by using a winch, and placing the temporary cable in a bridge deck access way area by using a cable spreading trolley;
(6.3) completing the coiling of the temporary cable;
(6.4) sequentially removing the upper half cable clamp and the lower half cable clamp of the temporary cable clamp by loosening the nut, and lowering the cable clamp to the area of the bridge deck maintenance way by using a winch.
4. The method of claim 1, wherein: for a replacement sling or a new sling, when the anchor cup at the lower end of the sling does not have a step structure to support the pushing reaction frame, the conical clamp is arranged at the anchor cup of the sling and fixed on the anchor cup, and the upward end surface of the conical clamp forms a step surface for supporting the pushing reaction frame.
5. The method of claim 1, wherein: the method comprises the following steps that in the method, the removal of a sling relates to the removal of a pin shaft connecting mechanism, a pin shaft is ejected out of an ear hole by adopting an auxiliary tool, the auxiliary tool comprises two shaft unloading reaction frames which are arranged at intervals relatively, a formed gap is used for accommodating the pin shaft connecting mechanism, the two shaft unloading reaction frames are mutually locked through a pull rod, an ejection jack is arranged at the end part of one shaft unloading reaction frame, a top pressure ring is arranged at the end part of the other shaft unloading reaction frame, the ejection jack and the top pressure ring are respectively positioned at two sides of a shaft hole of the pin shaft connecting mechanism, and the ejection jack can eject the pin shaft of the pin shaft connecting mechanism into an inner hole of the top pressure ring from the shaft hole so as to achieve the removal of the pin shaft connecting mechanism.
6. The method of claim 5, wherein: the shaft unloading reaction frames are provided with inner end faces and outer end faces, the inner end faces of the two shaft unloading reaction frames are opposite, and the pin shaft connecting mechanism is located between the two inner end faces.
7. The method of claim 5, wherein: the two unloading shaft reaction frames are mutually locked through a plurality of pull rods.
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| CN202110404360.8A CN113322834B (en) | 2021-04-15 | 2021-04-15 | Method for replacing sling of suspension bridge through single-lifting-point tensioning |
| PCT/CN2021/130499 WO2022217911A1 (en) | 2021-04-15 | 2021-11-15 | Method for replacing sling by means of tensioning at single suspension point for suspension bridge |
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| CN202110404360.8A CN113322834B (en) | 2021-04-15 | 2021-04-15 | Method for replacing sling of suspension bridge through single-lifting-point tensioning |
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| CN113815654A (en) * | 2021-10-29 | 2021-12-21 | 成都环境工程建设有限公司 | Construction method for translating and replacing steel cable of cross-river cableway |
| CN114150891A (en) * | 2021-12-30 | 2022-03-08 | 柳州欧维姆工程有限公司 | Inhaul cable replacing method for space cable net supporting structure |
| CN114518225A (en) * | 2022-02-21 | 2022-05-20 | 云南大学 | Cable clamp anti-sliding bearing capacity test device and method based on suspender tensioning |
| WO2022217911A1 (en) * | 2021-04-15 | 2022-10-20 | 江苏法尔胜缆索有限公司 | Method for replacing sling by means of tensioning at single suspension point for suspension bridge |
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Also Published As
| Publication number | Publication date |
|---|---|
| CN113322834B (en) | 2022-11-25 |
| WO2022217911A1 (en) | 2022-10-20 |
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