CN109516377B - Process for repairing inclined top cross beam of ship loader - Google Patents
Process for repairing inclined top cross beam of ship loader Download PDFInfo
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- CN109516377B CN109516377B CN201811282723.XA CN201811282723A CN109516377B CN 109516377 B CN109516377 B CN 109516377B CN 201811282723 A CN201811282723 A CN 201811282723A CN 109516377 B CN109516377 B CN 109516377B
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C13/00—Other constructional features or details
- B66C13/04—Auxiliary devices for controlling movements of suspended loads, or preventing cable slack
- B66C13/08—Auxiliary devices for controlling movements of suspended loads, or preventing cable slack for depositing loads in desired attitudes or positions
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K31/00—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups
- B23K31/02—Processes relevant to this subclass, specially adapted for particular articles or purposes, but not covered by only one of the preceding main groups relating to soldering or welding
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23P—METAL-WORKING NOT OTHERWISE PROVIDED FOR; COMBINED OPERATIONS; UNIVERSAL MACHINE TOOLS
- B23P6/00—Restoring or reconditioning objects
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C13/00—Other constructional features or details
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- Engineering & Computer Science (AREA)
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- Working Measures On Existing Buildindgs (AREA)
Abstract
A process for repairing a top cross beam of a ship loader comprises the following specific steps: (1) temporarily welding a reinforcing wedge-shaped steel plate and a peripheral U-shaped steel plate for protection; (2) designing a repair scheme by combining a drawing and the actual situation of a field; (3) the maintenance operation space is satisfied by using the floating crane and the main crane arm; (4) resetting a tower beam; (5) welding the reinforcing part, painting and picking up the spot. The invention provides a process for repairing a top cross beam of a ship loader, which is different from the traditional process for repairing the top cross beam of the ship loader, and is characterized in that a winch steel wire rope and the top cross beam are dismantled without long maintenance time; during the restoration, because the floating crane and the chain block are matched on the basis of not dismantling the hoisting steel wire rope and the top cross beam, the restoration completed on the premise of not being insufficient in hoisting parameters of the hoisting equipment is ensured, the influence on the production caused by overlong maintenance time is avoided to the greatest extent, the efficiency is improved, the cost is saved, and the device is safe and reliable.
Description
Technical Field
The invention relates to the field of maintenance of a top cross beam of a ship loader, in particular to an inclined repairing process of the top cross beam of the ship loader.
Background
The ship loader is a large bulk cargo machine used in bulk cargo wharf loading, and generally comprises a boom belt conveyor, a transition belt conveyor, a telescopic chute, a tail car, a traveling device, a gantry, a tower, a pitching device, a slewing device and the like. The pitching of the cantilever of the ship loader adopts a steel wire rope hoisting mode, a gear pair mechanism is driven by a motor and a speed reducer to drive a steel wire rope drum to move so as to achieve the aim of pitching the cantilever, the large arm pitching hinge point of the ship loader is easy to damage due to long-time operation or irregular installation of the ship loader, the assembly of the ship loader is completed in a host factory with complete process conditions, and for port and wharf users, the damaged hinge point bearing is difficult to replace in a working site, the arm frame pitching mechanism of the ship loader is provided with a cross beam at the top, the cross beam mainly has the function of adjusting the stress condition of the hoisting steel wire rope and has the height of about 45m away from the ground, a flange bolt of the cross beam at the top falls off to incline, certain repairing difficulty exists during repairing, the maintaining work efficiency is not high, and meanwhile, the.
Disclosure of Invention
The invention provides a repairing process for a top cross beam of a ship loader, aiming at solving the repairing problem of the top cross beam of the ship loader.
The technical scheme adopted by the invention is as follows:
a ship loader top cross beam inclination repairing process comprises the following specific steps:
(1) temporarily welding a reinforcing wedge-shaped steel plate and a peripheral U-shaped steel plate for protection:
measuring an opening angle at an inclined opening of a cross beam at the top of the ship loader; manufacturing two wedge-shaped steel plates and two peripheral U-shaped steel plates in a workshop according to the opening angle and the calculated sizes of the wedge-shaped steel plates and the peripheral U-shaped steel plates;
building an operation platform, and after the operation platform is built, welding and fixing the two manufactured wedge-shaped steel plates at the inclined opening of the top beam of the ship loader according to the calculation requirements; after the wedge-shaped steel plates are welded and fixed, respectively welding and fixing two peripheral U-shaped steel plates outside the connecting flange, and protecting the inclined position of the top cross beam;
(2) and (3) designing a repair scheme by combining drawings and actual field conditions:
according to an original design drawing of a ship loader, calculating a stress condition, determining a process repairing flow, calculating a hoisting performance parameter, selecting a hoisting crane and a rigging, and making a quality assurance measure;
(3) the large arm of the ship loader is hoisted by using the floating crane to meet the maintenance operation space:
releasing a steel wire rope, vertically hoisting a main arm of the floating crane, and arranging a large arm hoisting point of the ship loader on a box girder mounted on a front movable pulley block; annular synthetic fiber hoisting belts which accord with the hoisting coefficient are respectively bound on two sides of the box girder and then connected with the main hook of the floating crane in an annular mode, and a protective base plate is laid below the hoisting belts; connecting the auxiliary hook of the floating crane to two hoisting points on a beam of the tower frame through a hook type lock;
after the main hook and the auxiliary hook are fixed, slowly lifting the main hook to control the large arm of the ship loader to hoist, slowly releasing a hoisting steel wire rope, slowly releasing the main hook, and enabling the large arm of the ship loader to move to the side far away from the cross beam of the tower frame by means of self-rewinding hinge points; the steps are stopped until the distance between the large arm of the ship loader and the tower beam meets the space required by maintenance, the main hook is locked, the hoisting steel wire rope is slowly released to be completely loosened, and at the moment, the ship loader is only subjected to self gravity;
(4) resetting the tower beam:
installing auxiliary straightening inverted chains at the positions of a main arm buffer beam and a tower beam buffer beam of the floating crane to be tensioned, slowly lifting an auxiliary hook to tension a sling, removing a rib plate temporarily reinforced by a tower beam, and manufacturing an edge groove at the joint surface of a tower and a tower beam connecting flange; sequentially disassembling bolts on the connecting flange, polishing the joint surface of the flange and eliminating the floating rust; the auxiliary hook is slowly lifted and matched with 2 inverted chains, so that the cross beam slowly falls back until the flange surface is attached; installing a high-strength bolt, welding a warped surface formed by combining two flange plates at the groove, performing UT/MT detection after welding, and selecting qualified pieces;
(5) welding the reinforcing part, coating and painting, and picking up the site:
respectively welding reinforcing parts at the flange connection positions on two sides of the top cross beam, selecting UT/MT detection qualified parts, and coating and painting the reinforcing parts; repairing the damaged wire casing, and dismantling and building a temporary operation platform;
the top beam is repaired and divided into a fixed protection stage and a repair stage, and during the repair stage: the connection state of the cross beam of the tower is observed constantly in the hoisting process, abnormal sound and weld cracking of the structure are found, and hook falling is stopped immediately; and when the high-strength bolts are connected on the flange, fastening is carried out according to the connection sequence strictly, the initial screwing moment and the final screwing moment are unscrewed according to the specified moment standard and are finished after the final screwing is finished for 1h and before 24h, and then at least two connecting high-strength bolts are spot-checked.
The invention has the beneficial effects that: the invention provides a process for repairing a top cross beam of a ship loader, which is different from the traditional process for repairing the top cross beam of the ship loader, and is characterized in that a winch steel wire rope and the top cross beam are dismantled without long maintenance time; during the repair, on the basis of not dismantling the hoisting steel wire rope and the top cross beam, the inclined top cross beam is reset by matching the floating crane and the chain block, so that the maintenance time is greatly reduced, and the operation efficiency is improved; the repair is ensured to be completed on the premise of not being insufficient in hoisting parameters of the hoisting equipment, the influence of overlong maintenance time on production is avoided to a certain extent, the efficiency is improved, the cost is saved, and the method is safe and reliable.
Detailed Description
A ship loader top cross beam inclination repairing process comprises the following specific steps:
(1) temporarily welding a reinforcing wedge-shaped steel plate and a peripheral U-shaped steel plate for protection:
measuring an opening angle at an inclined opening of a cross beam at the top of the ship loader; manufacturing two wedge-shaped steel plates and two peripheral U-shaped steel plates in a workshop according to the opening angle and the calculated sizes of the wedge-shaped steel plates and the peripheral U-shaped steel plates;
building an operation platform, and after the operation platform is built, welding and fixing the two manufactured wedge-shaped steel plates at the inclined opening of the top beam of the ship loader according to the calculation requirements; after the wedge-shaped steel plates are welded and fixed, respectively welding and fixing two peripheral U-shaped steel plates outside the connecting flange, and protecting the inclined position of the top cross beam;
(2) and (3) designing a repair scheme by combining drawings and actual field conditions:
according to an original design drawing of a ship loader, calculating a stress condition, determining a process repairing flow, calculating a hoisting performance parameter, selecting a hoisting crane and a rigging, and making a quality assurance measure;
(3) the large arm of the ship loader is hoisted by using the floating crane to meet the maintenance operation space:
releasing a steel wire rope, vertically hoisting a main arm of the floating crane, and arranging a large arm hoisting point of the ship loader on a box girder mounted on a front movable pulley block; annular synthetic fiber hoisting belts which accord with the hoisting coefficient are respectively bound on two sides of the box girder and then connected with the main hook of the floating crane in an annular mode, and a protective base plate is laid below the hoisting belts; connecting the auxiliary hook of the floating crane to two hoisting points on a beam of the tower frame through a hook type lock;
after the main hook and the auxiliary hook are fixed, slowly lifting the main hook to control the large arm of the ship loader to hoist, slowly releasing a hoisting steel wire rope, slowly releasing the main hook, and enabling the large arm of the ship loader to move to the side far away from the cross beam of the tower frame by means of self-rewinding hinge points; the steps are stopped until the distance between the large arm of the ship loader and the tower beam meets the space required by maintenance, the main hook is locked, the hoisting steel wire rope is slowly released to be completely loosened, and at the moment, the ship loader is only subjected to self gravity;
(4) resetting a tower frame cross beam, installing auxiliary correction inverted chain driving tensioning at the positions of a main arm buffer beam of the floating crane and a tower frame cross beam buffer beam, slowly lifting an auxiliary hook to tension a sling, removing a rib plate temporarily reinforced by the tower frame cross beam, and manufacturing an edge groove at the junction surface of a tower frame and a tower frame cross beam connecting flange; sequentially disassembling bolts on the connecting flange, polishing the joint surface of the flange and eliminating the floating rust; the auxiliary hook is slowly lifted and matched with 2 inverted chains, so that the cross beam slowly falls back until the flange surface is attached; installing a high-strength bolt, welding a warped surface formed by combining two flange plates at the groove, performing UT/MT detection after welding, and selecting qualified pieces;
(5) welding the reinforcing part, coating and painting, and picking up the site:
respectively welding reinforcing parts at the flange connection positions on two sides of the top cross beam, selecting UT/MT detection qualified parts, and coating and painting the reinforcing parts; repairing the damaged wire casing, and dismantling and building a temporary operation platform;
the top beam is repaired and divided into a fixed protection stage and a repair stage, and during the repair stage: the connection state of the cross beam of the tower is observed constantly in the hoisting process, abnormal sound and weld cracking of the structure are found, and hook falling is stopped immediately; when the high-strength bolts are connected on the flange, fastening is carried out according to the connection sequence strictly, the initial screwing moment and the final screwing moment are unscrewed according to the specified moment standard and are finished after the final screwing is finished for 1h and before 24h, and then at least two connected high-strength bolts are spot-checked.
The invention will be further illustrated with reference to specific examples:
now, taking the inclined repairing condition of the top beam of the ship loader SL2 in the coal Huaneng coal wharf in Tianjin harbor of Tianjin southern Xinjiang harbor as an example, the repairing process of the top beam of the ship loader is introduced, and the concrete steps are as follows:
(1) temporarily welding and reinforcing wedge-shaped steel plate and peripheral U-shaped steel plate for protection
Measuring an opening angle at an inclined opening of a cross beam at the top of the ship loader by combining the actual situation of a field; manufacturing two wedge-shaped steel plates and two peripheral U-shaped steel plates in a workshop according to the opening angle and the calculated sizes of the wedge-shaped steel plates and the peripheral U-shaped steel plates;
according to the on-site requirement, a scaffold platform is built below a tower beam and a tower connecting point; determining the erection position and form of the scaffold on site, and after the scaffold platform is completely erected, welding and fixing the two manufactured wedge-shaped steel plates at the inclined opening of the top beam of the ship loader according to the calculation requirements; after the wedge-shaped steel plates are welded and fixed, the two U-shaped steel plates outside the connecting flange are respectively welded and fixed, the inclined position of the top cross beam is protected, and safety accidents are prevented.
(2) Design and repair scheme combining drawing and actual field situation
According to the original design drawing of the ship loader, calculating the stress condition, determining a process repairing flow, calculating hoisting performance parameters, and reasonably selecting a hoisting crane and a rigging; before the operation, quality files such as the quality certificate of plates and pipes, the quality certificate of high-strength bolt products, the quality inspection report, the torque wrench inspection report and the like required by the construction are inspected, a special construction scheme is reported, construction can be carried out after the construction inspection is qualified, reasonable and effective quality assurance measures are formulated by combining with the actual conditions of the site, safety technology is handed over to the organization of maintenance personnel, and the top beam of the SL2 ship loader is called to restore the special safety conference.
(3) Maintenance operation space satisfied by using floating crane to hoist large arm of ship loader
Releasing a steel wire rope, determining that a main arm of the floating crane is lifted vertically according to a horizontal load meter of a load tower pulley block, and arranging a large arm lifting point of a ship loader on a front movable pulley block mounting box girder; an annular synthetic fiber hoisting belt with the rated load of 80000kg is adopted, the length of the hoisting belt is about 30m, the safety coefficient of 6:1 is achieved, the hoisting belt is respectively bound on two sides of a box girder in an annular mode and then is connected with a main hook of a floating crane, and a protective base plate is laid below the hoisting belt; connecting the auxiliary hook of the floating crane to two hoisting points on a beam of the tower frame through a hook type lock not less than 200kN, wherein the auxiliary hook is only used as a safety aid in the current state, and the sling is not allowed to be stressed;
after the main hook and the auxiliary hook are fixed, slowly lifting the main hook, and stopping lifting when the display value of the main hook force limiter reaches 2/3 of the maximum lifting force of the current large arm of the ship loader under the horizontal plane angle; operating the large arm of the ship loader to hoist, slowly releasing a hoisting steel wire rope, marking the interference positions of the steel wire rope, a tower pulley block and a platform rope outlet hole so as to facilitate the detection of the steel wire rope, and stopping the hoisting after the steel wire rope is loosened; slowly releasing the main hook, correspondingly adjusting the amplitude of the floating crane, enabling the large arm of the ship loader to move to the side far away from the tower beam by self-rewinding a hinge point, and stopping hook falling when the main hook force limiter displays that the numerical value reaches 2/3 of the maximum lifting force of the large arm of the current ship loader under the angle of the horizontal plane after the steel wire rope is tensioned; and (4) circularly repeating the action until the distance between the large arm of the ship loader and the tower beam meets the space required by maintenance, stopping the steps, locking the main hook, and slowly releasing the hoisting steel wire rope to enable the hoisting steel wire rope to be completely loosened and only subjected to self gravity.
(4) Resetting the tower beam:
installing 2 auxiliary straightening inverted chains (with the weight limited by 10t) at the positions of a main arm buffer beam and a tower beam buffer beam of the floating crane, tensioning, slowly lifting an auxiliary hook to tension a sling, removing a rib plate temporarily reinforced by a tower beam, manufacturing edge grooves at the joint surface of a tower and a tower beam connecting flange, and arranging three edges of bolts which fall off; sequentially disassembling bolts on the connecting flange, temporarily pinning the connecting flange by using an M12 multiplied by 120(8.8/8 grade, namely, the nominal tensile strength is 8.8/value yield ratio is 8 and the nominal tensile strength is 8, and the nominal tensile strength is 8 and contains two gaskets) bolt group without fastening, and preventing the tower frame cross beam from generating excessive displacement after all the bolts are disassembled and generating adverse influence on the next reset work; polishing the flange joint surface to eliminate the floating rust, slowly lifting the auxiliary hook, and matching with 2 inverted chains to slowly drop the cross beam back until the flange joint surface is attached; a high-strength bolt M20 x 95(10.9/10 grade, namely, the nominal tensile strength is 10.9/value yield ratio is 10) of the surface where the mounting edge is located, and the construction final screwing torque of the bolt is determined, wherein k is an average torque coefficient measured by an experiment, P is 155kN, and d is 20; the bolt screwing is finished after 1h and before 24h, and the number of the connecting bolts is not less than 2 by spot check. During inspection, firstly, drawing a straight line on the end face of the screw and the nut, and then unscrewing the nut for about 60 degrees; re-tightening by using a torque wrench to enable the two lines to be overlapped, and measuring that the torque at the moment is in a range of 0.9 Tch-1.1 Tch (when k is 0.13, Tch is kPd which is 0.13 multiplied by 155 multiplied by 20 which is 403, wherein k is the average value of the torque coefficients of the high-strength bolt connection pair, p is the construction pretension force of the high-strength bolt, and d is the diameter of a screw rod of the high-strength bolt); and respectively welding the reinforcing parts, and detecting the welded seam to be qualified by 100% UT/MT.
(5) Welding the reinforcing part, painting and picking up the spot.
Repairing the damaged wire slot, respectively welding reinforcing parts at the flange connection positions on two sides of the top cross beam after detecting whether the steel wire rope is intact, selecting UT/MT detection qualified parts, and coating and painting the reinforcing parts; and repairing the damaged wire casing, dismantling the built scaffold operation platform, and informing a driver to test on the picking site.
While one embodiment of the present invention has been described in detail, the description is only a preferred embodiment of the present invention and should not be taken as limiting the scope of the invention. All equivalent changes and modifications made within the scope of the present invention shall fall within the scope of the present invention.
Claims (5)
1. The process for repairing the inclination of the top cross beam of the ship loader is characterized by comprising the following specific steps:
(1) temporarily welding a reinforcing wedge-shaped steel plate and a peripheral U-shaped steel plate for protection:
measuring an opening angle at an inclined opening of a cross beam at the top of the ship loader; manufacturing two wedge-shaped steel plates and two peripheral U-shaped steel plates in a workshop according to the opening angle and the calculated sizes of the wedge-shaped steel plates and the peripheral U-shaped steel plates;
building an operation platform, and after the operation platform is built, welding and fixing the two manufactured wedge-shaped steel plates at the inclined opening of the top beam of the ship loader according to the calculation requirements; after the wedge-shaped steel plates are welded and fixed, two peripheral U-shaped steel plates outside the connecting flange are respectively welded and fixed, and the inclined position of the top cross beam is protected to prevent safety accidents;
(2) and (3) designing a repair scheme by combining drawings and actual field conditions:
according to an original design drawing of a ship loader, calculating a stress condition, determining a process repairing flow, calculating a hoisting performance parameter, selecting a hoisting crane and a rigging, and making a quality assurance measure;
(3) the large arm of the ship loader is hoisted by using the floating crane to meet the maintenance operation space:
releasing a steel wire rope, vertically hoisting a main arm of the floating crane, and arranging a large arm hoisting point of the ship loader on a box girder mounted on a front movable pulley block; annular synthetic fiber hoisting belts which accord with the hoisting coefficient are respectively and annularly bound on two sides of a front movable pulley block mounting box girder and then are connected with a main hook of the floating crane, and a protective base plate is laid below the hoisting belts; connecting the auxiliary hook of the floating crane to two hoisting points on a beam of the tower frame through a hook type lock;
after the main hook and the auxiliary hook are fixed, slowly lifting the main hook, operating the large arm of the ship loader to hoist, slowly releasing a hoisting steel wire rope, slowly releasing the main hook, and moving the large arm of the ship loader to the side far away from the cross beam of the tower frame by means of the self-rewinding hinge point; the steps are stopped until the distance between the large arm of the ship loader and the tower beam meets the space required by maintenance, the main hook is locked, and the hoisting steel wire rope is slowly released to be completely loosened and only subjected to self gravity;
(4) reset tower beam
Installing auxiliary straightening inverted chains at the positions of a main arm buffer beam and a tower beam buffer beam of the floating crane to be tensioned, slowly lifting an auxiliary hook to tension a sling, removing a rib plate temporarily reinforced by a tower beam, and manufacturing an edge groove at the joint surface of a tower and a tower beam connecting flange; sequentially disassembling bolts on the connecting flange, polishing the joint surface of the flange and eliminating the floating rust; the auxiliary hook is slowly lifted and matched with 2 chain blocks, so that the tower beam slowly falls back until the flange surface is attached; installing a high-strength bolt, welding a warped surface formed by combining two flange plates at the edge groove, performing UT/MT detection after welding, and selecting qualified pieces;
(5) welding reinforcing parts, painting and picking up site
Respectively welding reinforcing parts at the flange connection positions on two sides of the top cross beam, selecting UT/MT detection qualified parts, and coating and painting the reinforcing parts; and repairing the damaged wire groove and dismantling the built operation platform.
2. The process for repairing the inclination of the top cross beam of the ship loader according to claim 1, wherein the repair of the top cross beam is divided into a fixed protection stage and a repair stage, and the repair stage has two requirements: the connection state of the cross beam of the tower is observed constantly in the hoisting process, abnormal sound and weld cracking of the structure are found, and hook falling is stopped immediately; when the high-strength bolts are connected on the flange, fastening is carried out according to the connection sequence strictly, the initial screwing moment and the final screwing moment are unscrewed according to the specified moment standard, and at least two connected high-strength bolts are subjected to spot check after the final screwing is finished for 1h and before 24 h.
3. The process for repairing the inclination of the top cross beam of the ship loader according to claim 1, wherein the step (3) of hoisting the large arm of the ship loader by using a floating crane meets the requirement of maintenance operation space: releasing a steel wire rope, determining that a main arm of the floating crane is lifted vertically according to a horizontal load meter of a load tower pulley block, and arranging a large arm lifting point of a ship loader on a front movable pulley block mounting box girder; an annular synthetic fiber hoisting belt with the rated load of 80000kg is adopted, the safety coefficient of about 30m and 6:1 is adopted, the annular synthetic fiber hoisting belt is respectively and annularly bound on two sides of a front movable pulley block mounting box girder and then is connected with a main hook of a floating crane, and a protective base plate is laid below the hoisting belt; the auxiliary hook of the floating crane is connected to two lifting points on a cross beam of the tower frame through a hook type lock not smaller than 200kN, and in the current state, the auxiliary hook is only used as a safety aid, and the sling is not allowed to be stressed.
4. The process for repairing the inclination of the top cross beam of the ship loader according to claim 1, wherein the step (3) of hoisting the large arm of the ship loader by using a floating crane meets the requirement of maintenance operation space: after the main hook and the auxiliary hook are fixed, slowly lifting the main hook, and stopping lifting when the display value of the main hook force limiter reaches 2/3 of the maximum lifting force of the current large arm of the ship loader under the horizontal plane angle; operating the large arm of the ship loader to hoist, slowly releasing a hoisting steel wire rope, marking the interference positions of the steel wire rope, a tower pulley block and a platform rope outlet hole so as to facilitate the detection of the steel wire rope, and stopping the hoisting after the steel wire rope is loosened; slowly releasing the main hook, correspondingly adjusting the amplitude of the floating crane, enabling the large arm of the ship loader to move to the side far away from the tower beam by self-rewinding a hinge point, and stopping hook falling when the main hook force limiter displays that the numerical value reaches 2/3 of the maximum lifting force of the large arm of the current ship loader under the angle of the horizontal plane after the steel wire rope is tensioned; and (4) circularly repeating the action until the distance between the large arm of the ship loader and the tower beam meets the space required by maintenance, stopping the steps, locking the main hook, and slowly releasing the hoisting steel wire rope to enable the hoisting steel wire rope to be completely loosened and only subjected to self gravity.
5. The process for repairing the inclination of the top beam of the ship loader according to claim 1, wherein the tower beam is reset in the step (4): installing 2 auxiliary straightening inverted chains at the positions of a main arm buffer beam and a tower beam buffer beam of the floating crane, limiting the weight for 10t to be tensioned, slowly lifting an auxiliary hook to tension a sling, removing a rib plate temporarily reinforced by a tower beam, manufacturing an edge groove at the joint surface of a tower and a tower beam connecting flange, and forming three edges of a bolt drop; the bolts on the connecting flange are sequentially disassembled, when one bolt is disassembled, the bolt needs to be of M12 x 120 grade, 8.8/8 grade, the bolt group is temporarily pinned without fastening, the bolt head slightly exceeds the plane of the nut, and the tower frame cross beam is prevented from generating excessive displacement after all the bolts are disassembled to generate adverse effect on the next reset work; polishing the flange joint surface to eliminate the floating rust, slowly lifting the auxiliary hook, and matching with 2 inverted chains to slowly drop the tower frame beam back until the flange surface is attached; the construction finish-screwing torque of the high-strength bolt is determined by M20 x 95, 10.9/10 grade, wherein k is an average torque coefficient measured by an experiment, P is 155kN, and d is 20; finishing the final screwing of the high-strength bolts for 1 hour and before 24 hours, wherein the number of the connected high-strength bolts is not less than 2; during inspection, firstly, drawing a straight line on the end face of the screw and the nut, and then unscrewing the nut for about 60 degrees; re-tightening by using a torque wrench to enable the two lines to be overlapped, measuring the torque which is in a range of 0.9 Tch-1.1 Tch, and when k is 0.13, measuring Tch which is kPd which is 0.13 multiplied by 155 multiplied by 20 which is 403, wherein k is the average value of the torque coefficients of the high-strength bolt connection pair, p is the construction pretension force of the high-strength bolt, and d is the diameter of a screw rod of the high-strength bolt; and respectively welding the reinforcing parts, and detecting the welded seam to be qualified by 100% UT/MT.
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| CN201811282723.XA CN109516377B (en) | 2018-10-31 | 2018-10-31 | Process for repairing inclined top cross beam of ship loader |
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| CN201811282723.XA CN109516377B (en) | 2018-10-31 | 2018-10-31 | Process for repairing inclined top cross beam of ship loader |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JPH1149470A (en) * | 1997-08-04 | 1999-02-23 | Mitsubishi Heavy Ind Ltd | Slinging device |
| CN104528411B (en) * | 2014-11-18 | 2017-01-18 | 惠生（南通）重工有限公司 | Method for integrally shifting main body of ship loader |
| CN108423565B (en) * | 2018-04-18 | 2019-06-14 | 中铁十九局集团轨道交通工程有限公司 | The erection and Demolition Construction method of U-shaped twin beams gantry crane with hook |
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