CN117645240A - Construction method of portal crane for bridge construction and bridge - Google Patents
Construction method of portal crane for bridge construction and bridge Download PDFInfo
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- CN117645240A CN117645240A CN202311859196.5A CN202311859196A CN117645240A CN 117645240 A CN117645240 A CN 117645240A CN 202311859196 A CN202311859196 A CN 202311859196A CN 117645240 A CN117645240 A CN 117645240A
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- 229910000831 Steel Inorganic materials 0.000 claims abstract description 205
- 239000010959 steel Substances 0.000 claims abstract description 205
- 238000009434 installation Methods 0.000 claims abstract description 21
- 238000004873 anchoring Methods 0.000 claims abstract description 11
- 238000012360 testing method Methods 0.000 claims description 38
- 230000007246 mechanism Effects 0.000 claims description 23
- 230000003068 static effect Effects 0.000 claims description 15
- 238000000034 method Methods 0.000 claims description 12
- 239000011150 reinforced concrete Substances 0.000 claims description 11
- 238000012545 processing Methods 0.000 claims description 6
- 230000002618 waking effect Effects 0.000 claims description 3
- 238000003466 welding Methods 0.000 description 57
- 239000003921 oil Substances 0.000 description 9
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- 238000004140 cleaning Methods 0.000 description 4
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- 238000000227 grinding Methods 0.000 description 3
- 239000002184 metal Substances 0.000 description 3
- 238000005498 polishing Methods 0.000 description 3
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Classifications
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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
- B66C19/00—Cranes comprising trolleys or crabs running on fixed or movable bridges or gantries
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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
- B66C5/00—Base supporting structures with legs
- B66C5/02—Fixed or travelling bridges or gantries, i.e. elongated structures of inverted L or of inverted U shape or tripods
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C6/00—Girders, or track-supporting structures, specially adapted for cranes
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C2700/00—Cranes
- B66C2700/01—General aspects of mobile cranes, overhead travelling cranes, gantry cranes, loading bridges, cranes for building ships on slipways, cranes for foundries or cranes for public works
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- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The invention relates to a portal crane construction method bridge for bridge construction, which comprises the following steps: s1: constructing a steel tower and steel box girders at two ends of the steel tower, installing a track on the steel box girders and anchoring; constructing the portal crane when anchoring is completed; s2: connecting the steel box girder to be spliced with the spliced steel box girder through a gantry crane, and performing wet joint construction between two adjacent steel box girders when the steel box girder to be spliced is connected with the spliced steel box girder; s3: installing stay ropes on the steel box girder and performing pre-tensioning treatment; s4: and repeating the steps S2-S3 until all the steel box girders are connected. Compared with the traditional construction method, the construction method of the portal crane for the bridge building has the advantages of higher overall efficiency, larger construction period and more convenient installation.
Description
Technical Field
The invention relates to the technical field of hoisting machinery, in particular to a portal crane construction method for bridge construction and a bridge.
Background
The gantry crane is a variant of a bridge crane, also called gantry crane, and is a bridge crane in which the bridge is supported on the ground track by two side legs. The device is mainly used for loading and unloading operations of outdoor goods yards, stock yards and bulk cargoes. The portal crane has the characteristics of high field utilization rate, large operation range, wide application range, strong universality and the like, and is widely used in port cargo yards.
The portal crane structurally comprises a portal frame, a cart running mechanism, a trolley, an electric part and the like. Some portal cranes have legs on one side only and the other side is supported for operation on a building or trestle, known as semi-portal cranes. The upper bridge of portal frame of portal crane is composed of main beam, end beam, supporting leg and lower beam. In order to expand the working range of the crane, the main beam can extend out of the supporting legs to one side or two sides to form a cantilever. The crane trolley with the arm support can be adopted, and the operation range of the crane is enlarged through pitching and rotation of the arm support; most of the cranes (including but not limited to portal cranes) for construction in the current market have slower installation speed in the installation process, higher labor and time cost and certain potential safety hazard; particularly in the aspect of bridge construction engineering, the installation speed is low, so that the whole construction period of a bridge can be delayed to a certain extent, and larger loss is caused.
Disclosure of Invention
In order to achieve the purpose of the invention, the invention provides a portal crane construction method for bridge construction, which comprises the following steps:
s1: constructing a steel tower and steel box girders at two ends of the steel tower, installing a track on the steel box girders and anchoring; constructing the portal crane when anchoring is completed;
s2: connecting the steel box girder to be spliced with the spliced steel box girder through a gantry crane, and performing wet joint construction between two adjacent steel box girders when the steel box girder to be spliced is connected with the spliced steel box girder;
s3: installing stay ropes on the steel box girder and performing pre-tensioning treatment;
s4: and repeating the steps S2-S3 until all the steel box girders are connected.
Preferably, the construction of the gantry crane in the step S1 specifically includes:
hoisting and constructing the landing legs of the gantry crane, and connecting the landing legs with the track when the construction is completed; the support structure is adopted to temporarily support the support leg; hoisting and constructing a main truss of the gantry crane, and installing the main truss and the bracket in a contraposition manner; after the alignment and installation are completed, installing the supporting mechanisms on the two sides of the supporting legs again; constructing a transverse connection on the steel box girder and constructing an installation platform on the side edge of the main truss at the same time; performing alignment installation on the transverse connection and the main truss, and performing disassembly treatment on the supporting mechanism after the alignment installation is completed;
hoisting and constructing a travelling crane mechanism, a crane trolley and an auxiliary structure; when the travelling mechanism is installed, measuring and rechecking a shape-changing track on the main truss, and fixing a buckling track of the travelling mechanism if a preset condition is met;
hoisting the trolley and arranging anti-skid wooden wedges on running wheels of the trolley; and (5) hoisting and constructing the auxiliary structure when the hoisting and constructing are completed, and completing the installation of the crane.
Preferably, the specific step of connecting the steel box girder to be spliced and the spliced steel box girder in the step S2 includes:
when the first section of the spliced steel box girder is spliced, the split of the gantry crane is started, the front supporting leg of the gantry crane is disassembled, the rest part of the gantry crane is supported, the front supporting leg is hoisted to a position with a preset interval between the front supporting leg and the rear supporting leg after being disassembled, the front supporting leg is spliced with the track and the rest part of the gantry crane, and a supporting structure is installed again after the splicing to fixedly support the front supporting leg; and splicing the longitudinal beam lengthening section with the original main beam of the gantry crane, disassembling the supporting structure when the splicing is completed, and hoisting and constructing the subsequent steel box girder.
Preferably, the step S1 further includes:
s11: carrying out an idle load test and a load test, and splicing the subsequent steel box girders after the idle load test and the load test meet preset conditions; the load test comprises an 80% rated load static load test, a 100% rated load static load test and a 125% rated load static load test.
Preferably, the specific step of connecting the steel box girder to be spliced and the spliced steel box girder in the step S2 includes:
when the steel box girder to be spliced and the spliced steel box girder are at the same horizontal height, the steel box girder to be spliced is close to the spliced steel box girder through a longitudinal moving oil cylinder on the gantry crane, when a preset interval is reserved between the steel box girder to be spliced and the spliced steel box girder, longitudinal slope and transverse slope adjustment of the steel box girder to be spliced are carried out through the gantry crane, and then the steel box girder to be spliced and the spliced steel box girder are connected.
Preferably, the specific step of connecting the steel box girder to be spliced and the spliced steel box girder in the step S2 further includes:
firstly, carrying out rough matching on the steel box girders to be spliced through a portal crane, and carrying out fine matching on the steel box girders when the rough matching processing is completed;
the rough matching processing steps specifically comprise: the steel box girders to be spliced are moved to 50mm positions of the edges of the spliced steel box girders through a longitudinal positioning oil cylinder of the gantry crane; then the longitudinal slope height of the steel box girder to be spliced is adjusted through a threaded rod locking system on the gantry crane, the transverse slope of the steel box girder to be spliced is adjusted through adjusting the lifting height of the crane on the gantry crane, the steel box girder to be spliced is moved to the position of 10mm on the edge of the spliced steel box girder through a longitudinal positioning oil cylinder of the gantry crane, then the steps of waking up the transverse slope and adjusting the longitudinal slope are repeated, and then rough matching is carried out through arranging matching pieces on two adjacent steel box girders.
Preferably, the invention also provides a bridge, which is constructed by the portal crane construction method for bridge construction according to any embodiment.
Preferably, the bridge comprises a lower tower column, a reinforced concrete combined section, a steel tower column and a steel box girder, wherein the lower tower column, the reinforced concrete combined section and the steel tower column are sequentially connected from bottom to top to form the reinforced concrete combined section, the lower tower column is connected with the reinforced concrete combined section to form a Y-shaped framework, the steel tower column comprises a first section, a second section, a third section and a fourth section, the first section, the second section, the third section and the fourth section are sequentially connected from bottom to top to form the steel tower column, and the first section and the second section are in an eight-shaped structure.
Preferably, each section of the steel tower column is provided with a matching alignment device and a guide limiting plate, and the guide limiting plates are arranged in a trapezoid structure; the matching alignment device and the guide limiting plate are respectively arranged at the outer side of each section, and are both used for matching connection between two adjacent sections in the steel tower column; the inner sides of the sections are also provided with connecting plates, and the connecting plates are used for aligning and connecting the sections of the steel tower column.
Preferably, the bridge further comprises a gantry crane and a track arranged on the steel box girder, wherein the gantry crane is in sliding connection with the track, and the track is detachably connected with the steel box girder; the gantry crane is provided with a rotary lifting appliance for adjusting or rotating the angle of the lifted object.
The beneficial effects of the invention are as follows: compared with the traditional construction method, the construction method of the portal crane for the bridge building and the bridge provided by the invention have the advantages of higher overall efficiency, larger construction period and more convenient installation.
Drawings
The foregoing and other objects, features and advantages of the invention will be apparent from the following more particular description of preferred embodiments of the invention, as illustrated in the accompanying drawings. Like reference numerals refer to like parts throughout the drawings, and the drawings are not intentionally drawn to scale on actual size or the like, with emphasis on illustrating the principles of the invention.
Fig. 1 is a schematic flow chart of hoisting a steel box girder by a gantry crane according to an embodiment of the present invention;
fig. 2 is a schematic hoisting view of a gantry crane and a steel box girder according to an embodiment of the present invention;
fig. 3 is a schematic diagram of a specific structure of a steel tower and a gantry crane according to an embodiment of the present invention;
fig. 4 is a specific schematic view of an up-slope of a main beam according to an embodiment of the present invention;
FIG. 5 is a schematic flow chart of the prestressed construction provided by the embodiment of the invention;
fig. 6 is a schematic view of a part of a bridge structure according to an embodiment of the present invention;
fig. 7 is a schematic structural diagram of a lower tower column and a reinforced concrete joint section according to an embodiment of the present invention;
in the figure: 1-portal crane, 11-steel box girder, 2-first section, 20-steel-concrete combination section, 21-second section, 22-third section, 23-fourth section, 3-driving mechanism, 31-main truss, 32-front landing leg, 33-lifting trolley, 34-rear landing leg, 35-mounting platform, 4-steel tower column and 41-lower tower column.
Detailed Description
The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and specific examples, so that those skilled in the art can better understand the present invention and implement it, but the examples are not limited thereto.
Referring to fig. 1 to 6, an embodiment of the present invention provides a method for constructing a gantry crane 1 for bridge construction, including the following steps:
s1: carrying out construction of a steel tower and steel box girders 11 at two ends of the steel tower (referring to fig. 4, wherein the steel box girders 11 at two ends of the steel tower are main girders, 2.0% of transverse slopes are arranged on the main girders and are formed by adjusting the heights of webs, and a bottom plate is kept horizontal, 2% of transverse slopes exist from the central line to two sides of the transverse bridge, so that the rail girders are arranged at the positions of the transverse bridge, which are positioned outside the bridge deck, of a rail girder in order to ensure the installation and use of a functional process of the longitudinal girder and a travelling mechanism of the gantry crane 1, and the heights of the cushion blocks are about 215mm (fine adjustment according to the actual measurement condition of the bridge deck)), installing the rails on the steel box girders 11 and anchoring the rails (after the rails are installed in place, anchoring the rails, so as to ensure the stability of the rails in the hoisting construction and travelling process of the gantry crane 1); when anchoring is completed, constructing the gantry crane 1;
s2: the method comprises the steps that a steel box girder 11 to be spliced and the spliced steel box girders 11 are connected through a gantry crane 1, and when the steel box girders 11 to be spliced are connected with the spliced steel box girders 11, wet joint construction between two adjacent steel box girders 11 is carried out;
s3: installing stay cables (each stay cable is provided with an EVFD-15x50 built-in viscous damper at the beam end) on a steel box beam 11, and performing pretension treatment (the pretension treatment is repeated, and the method is mainly used for testing the stability and rigidity of the stay cables);
prestress tensioning follows the principle of symmetrical tensioning of long ropes, thick ropes, short ropes and thin ropes;
the tensioning process comprises the following steps: 0- & gt initial stress (20% of final tension control stress, measuring the elongation of the steel strand and marking, measuring the exposed amount of the tool anchor clamping piece) & gt graded tension (60% of final tension control stress, measuring the elongation of the steel strand) & gt tension control stress (measuring the elongation of the steel strand and marking), measuring the exposed amount of the tool anchor clamping piece) & gt static stop for 5min (automatic pressure stabilization of the tension equipment), checking to tension control stress & gt return oil anchoring (measuring total retraction amount and measuring exposed amount of the work anchor clamping piece).
S4: and repeating the steps S2-S3 until all the steel box girders 11 are connected.
In a preferred embodiment, the connection between two adjacent steel box girders 11 is completed by a welding step:
the welding sequence of the steel box girder 11 is as follows:
1. vertically and symmetrically welding web butt welds;
2. symmetrically welding butt welding seams of the bottom plate and the inclined bottom plate from the middle to two sides;
3. symmetrically backing up butt welds of a welding top plate by adopting a flux-cored wire CO2 gas shielded welding from the middle to two sides, and then filling and capping welding from one side to the other side by adopting submerged arc automatic welding;
4. vertically and symmetrically welding transverse butt welding seams of the tuyere sloping plates;
5. welding the welding seam of the longitudinal rib (U type and I type) block, welding the butt welding seam first and then welding the corner welding seam.
The welding seams which are not described in the steps are all shielded welding by flux-cored wire CO2 gas.
Before welding, a welding area cleaning step is required:
1. before welding, all the cutting surfaces of the welding grooves, shop primer and other harmful substances in the area to be welded, and substances which interfere with welding, such as oxide skin, rust, moisture, paint and the like in a specified range are cleaned, polished and cleaned, and metallic luster is required to be exposed.
2. All submerged arc welded steel surfaces are cleaned according to the requirement of the item (1), and rust at the possibly contacted part of the welding flux is uniformly cleaned in the welding process, so that the rust is prevented from being clamped in the welding flux.
3. The cleaning range of the welding area is 30mm range on both sides of the welding area.
4. And performing pre-welding cleaning on the welding striking and extinguishing plate according to the welding line requirement of the main body structure.
5. The weld zone clean-up generally requires that the components be performed prior to assembly, after assembly of the components, care be taken to protect, and for the primary components, the weld will be performed within 24 hours after assembly. If the steel is rusted again or is attached with moisture, rust and other impurities which interfere with welding, the steel is cleaned again.
After the welding is finished, a welding line polishing step is also needed:
1. the arc-striking and extinguishing plates or product test plates at the two ends are cut off by gas cutting, and the cut is ground flat, so that the parent metal (the parent metal of the steel box girder 11) is not damaged. 2. Welding lines with welding waves or surplus height exceeding a specified upper limit value, and welding lines with welding waves or surplus height being smaller than 1mm and out-of-tolerance undercut must be smoothed and smoothed; when the seam undercut exceeds 1mm, the manual arc welding can be adopted for repairing treatment, and the repairing and the smoothing can be carried out.
The welding process further comprises the step of repairing the welding seam after the welding is completed:
weld repair meets the following requirements:
1. and (3) removing welding defects by adopting a carbon arc gouging or other mechanical methods, planing a groove which is beneficial to repair welding when the defects are removed, and grinding oxide skin on the surface of the groove by using a grinding wheel to expose metallic luster.
2. The removal length of the welding cracks extends 50mm from each crack end, and the welding cracks are planed into 1: 5.
3. The repair weld joint is inspected according to the quality requirement of the original weld joint, and the repair weld joint at the same part is not allowed to be repaired twice.
4. Preheating is carried out before carbon arc gouging according to the regulation, preheating and surface cleaning before repairing welding are the same as those in formal welding, and the interlayer temperature in the welding line repairing process is always kept without intermediate stop until repairing is finished.
5. And repairing the grooving depth of one side of the welding line, wherein the grooving depth is not more than 65% of the effective welding thickness of the welding line of the design drawing, and when the defect depth exceeds the range, the grooving depth is required to be repaired on the reverse side.
6. And (3) polishing the repaired weld surface uniformly and smoothly by adopting a grinding wheel, wherein the polishing requirement is according to the regulation.
In the preferred embodiment, the prestress construction step is further included between two adjacent steel box girders 11:
checking the pore canal before passing the bundle, and ensuring the smoothness in the pore canal. Before the prestress steel strand is threaded, the steel strands are braided in advance, the steel strands are straightened one by one during the braiding, the winding is prevented, and the steel strands are bound once every 1-1.5 m, so that the binding is firm and straight.
When the steel strand is threaded, a manual matching winch is adopted to thread the steel strand, a steel wire rope is threaded firstly to serve as a lead, the lead is fixedly connected with one end of the whole steel strand, and then the lead is utilized to drag and thread the whole steel strand.
And after one end of the steel strand is threaded in place, adjusting the direction of the winch, and threading the lead wire to the other end until the steel strand is threaded at the other end. After the steel strands are penetrated, the wet joint concrete at the position is poured in time
Referring to fig. 1 to 6, in a preferred embodiment, the construction of the gantry crane 1 in step S1 specifically includes:
hoisting and constructing the landing leg of the gantry crane 1, and connecting with the track when the construction is completed; the support structure is adopted to temporarily support the support leg; hoisting and constructing a main truss 31 of the gantry crane 1, and installing the main truss 31 and a bracket in a contraposition manner; after the alignment and installation are completed, installing supporting mechanisms (used for temporarily supporting the supporting legs and guaranteeing the stability of the supporting legs) on two sides of the supporting legs again; constructing a cross joint on the steel box girder 11 and constructing a mounting platform 35 at the side of the main truss 31 (the mounting platform 35 is used for supporting the cross joint and bolting); the transverse connection and the main truss 31 are installed in a contraposition mode, and after the contraposition installation is completed, the supporting mechanism is detached;
hoisting and constructing the travelling crane mechanism 3, the crane trolley 33 and the auxiliary structure; when the travelling mechanism 3 is installed, measuring and rechecking a shape-moving track on the main truss 31, if the preset condition is met, carrying out rail buckling fixation (before the travelling mechanism 3 is hoisted, the travelling track size on the main truss 31 is required to be rechecked, and the height of a steel rail lower backing plate is determined according to the measurement result, so that the accuracy is guaranteed, namely, the straightness error in the horizontal plane of the steel rail is less than or equal to L/1000, the total length is less than or equal to 3mm, the track spacing error in any cross section is +/-3.5 mm, the height difference between two track tops in any cross section is less than or equal to 3mm, the longitudinal gradient of the track is less than or equal to 0.4 percent, the travelling mechanism 3 is hoisted on the track, the symmetry of the split surfaces of two wheels in the track direction is not more than 1mm, the same supporting leg is not more than 2mm, and the travelling mechanism 3 is hoisted in place, and rail buckling fixation is carried out so as to prevent the tipping, and support is rechecked, the symmetry, the span, the diagonal spacing, the center distance of the tread and the track center distance are ensured to be within the allowable error range;
hoisting the hoisting trolley 33 and arranging anti-slip wooden wedges (preventing trolley slip) on the running wheels of the hoisting trolley 33; and (5) hoisting and constructing auxiliary structures (ladder platforms, electric systems, hydraulic systems, lifting hooks of lifting appliances and the like) when the hoisting and constructing are completed, and completing the installation of the crane.
Referring to fig. 1, in a preferred embodiment, the specific steps of connecting the steel box girder 11 to be spliced and the spliced steel box girder 11 in step S2 include:
when the first section of the spliced steel box girder 11 is spliced, the splitting of the gantry crane 1 is started, the front support leg 32 of the gantry crane 1 is disassembled, the rest of the gantry crane 1 is supported, the front support leg 32 is hoisted to a position which is at a preset interval with the rear support leg 34 after being disassembled, the front support leg 32 is spliced with the track and the rest of the gantry crane 1, and a support structure is installed again after the splicing to fixedly support the front support leg 32; the longitudinal beam lengthening section and the original main beam of the gantry crane 1 are spliced, when the splicing is completed, the disassembly treatment of the supporting structure is carried out, and the subsequent hoisting and construction of the steel box beam 11 are carried out (namely, when the hoisting of the first section of steel box beam 11 is completed, the support legs are required to be disassembled and assembled, and the long-distance installation of the steel box beam 11 is realized through the detachable connection of the rails and the front and rear support legs 34).
Referring to fig. 1-6, in a further preferred embodiment, step S1 further includes:
s11: carrying out an idle load test and a load test, and splicing the subsequent steel box girder 11 after the idle load test and the load test meet preset conditions; the load tests include an 80% rated load static test, a 100% rated load static test, and a 125% rated load static test.
Specific:
no-load test purpose: and checking whether the movement of the relevant part is normal.
The no-load test is mainly carried out as follows:
1) The lifting and descending test of the whole crane is carried out by using a jack, and whether the lifting hydraulic system of the crane works normally is checked; whether the lifting and descending processes are stable or not, and whether the tilting phenomenon exists or not; whether the leveling is stable, accurate and convenient.
2) The crane runs on the track in an idle mode, and whether the running hydraulic system works normally is checked; whether walking is smooth, stable and inclined; whether the walkways are stuck or not and whether the walkways are synchronous or not.
3) The big hook of the bridge deck crane (gantry crane 1) is lifted upwards and lowered simultaneously, and whether the lifting speeds of the two lifting mechanisms of the crane are consistent or not is checked, so that the synchronous requirement can be met; whether the jacking performance of the jack meets the design requirement or not; whether the lifting height limiter and the brake act sensitively and reliably.
(3) Load test
Load test purpose: the inspection bridge deck crane can meet the requirement of the section hoisting of the heaviest steel box girder 11 in the project.
1) Static load test of 50% rated load
Two barges are used for loading heavy objects, so that the two barges for loading the heavy objects are right under a big hook of a bridge deck crane, the big hook is fallen down, the heavy objects (0.5Q) are lifted 50cm away from a deck, slowly and quickly run up and down and are braked at any time, and whether the functions of a winch and each part are normal or not is checked.
2) 80% rated load static test
And (3) lifting the weight (0.8Q) for lifting, descending, braking and other tests. The holding time is not less than 15 minutes. Checking whether the functions of the windlass and each part are normal.
3) 100% rated load static test
After the 80% static test is finished, the load is continuously increased to the rated load Q, the holding time is not less than 15 minutes, and in the test, the complete machine operation and whether the functions of the parts such as a winch are normal or not and whether abnormal sounds exist are closely noticed.
4) 125% rated load static load test
Weights such as concrete blocks are symmetrically placed on the steel box girder 11, the weights are firstly lifted up together by about 50cm, the load is determined to be 1.25 times of the rated load, the load is maintained for half an hour, and whether the functions of the whole machine, a winch and other parts are normal or not is checked, and whether abnormal sounds exist or not.
5) After unloading, the components are checked for obvious deformation, looseness of the connecting bolts and cracks of the main welding lines.
In the preferred embodiment, when the bridge installation is completed, the dismantling operation of the gantry crane 1 is required, which comprises the following steps:
1. the power cable of the crane is disassembled, then the power cables of the mechanisms, the lighting, the control circuits, the cab and the electric cabinet are disassembled, finally the external electric facilities such as the cab, the electric cabinet, the monitoring equipment and the lighting equipment are disassembled (the auxiliary structure 2 is disassembled, then the crane trolley 33 (crown block) is disassembled, the crown block is lowered down to the steel wire rope, the lifting appliance is fallen on the bridge deck, the lifting appliance is disassembled, the crane is used for integrally disassembling the crown block from the movable truss car, the 3, the movable truss car is disassembled, the crane is used for integrally disassembling the movable truss car from the main truss 31, 4, the main truss 31 is disassembled, the parallel connection between the main trusses 31 is firstly disassembled, the main truss 31.5 is disassembled, the hydraulic system oil pipe is disassembled, the residual oil in the pipe is poured into a prepared container, and the hydraulic station of the system is disassembled, 6, the track is disassembled, and the track distribution beam is disassembled.
In the application, a steel box girder 11 lifting lug adopts a bolting structure, and a transverse girder web plate at the lifting lug position adopts a penetration welding line.
Referring to fig. 1-6, in a further preferred embodiment, the specific steps of connecting the steel box girder 11 to be spliced and the spliced steel box girder 11 in step S2 include:
when the steel box girder 11 to be spliced and the spliced steel box girder 11 are at the same horizontal height, the steel box girder 11 to be spliced is close to the spliced steel box girder 11 through a longitudinally moving oil cylinder on the gantry crane 1, and when a preset interval (10 cm) is reserved between the steel box girder 11 to be spliced and the spliced steel box girder 11, longitudinal slope and transverse slope adjustment of the steel box girder 11 to be spliced are carried out through the gantry crane 1, and then connection of the steel box girder 11 to be spliced and the spliced steel box girder 11 is carried out.
Referring to fig. 1 to 6, in a preferred embodiment, the specific steps of performing the connection between the steel box girder 11 to be spliced and the spliced steel box girder 11 in step S2 further include:
firstly, carrying out rough matching on the steel box girder 11 to be spliced through the portal crane 1, and carrying out fine matching on the steel box girder 11 when the rough matching processing is completed;
fine matching:
1. and when the construction control condition is met (the temperature difference of the top and the bottom of the steel box girder 11 is less than 2 ℃), performing fine matching operation.
2. Firstly, the front end of the cantilever is locally measured (the relative plane positions and the heights of the control points of the 11 sections of the adjacent 3 steel box girders are measured), and the control instructions are compared to determine the required adjustment quantity.
3. Slightly loosening the matching bolt, and adjusting the relative height difference of the upstream control point and the downstream control point of the 11 sections of the steel box girder according to the adjustment quantity; and arranging a jack at the web position of the steel box girder 11 to adjust the axis of the steel box girder 11.
4. And retesting the partial line shape and the axis of the front end of the cantilever, checking the welding gap, and welding and fixing the crossed limiting plate at the top plate to screw the bolt of the matching piece after the accuracy control requirement is met.
The rough matching processing steps specifically comprise: the steel box girder 11 to be spliced is moved to the position 50mm away from the edge of the spliced steel box girder 11 through a longitudinal positioning oil cylinder of the gantry crane 1; then the longitudinal slope height of the steel box girder 11 to be spliced is adjusted through a threaded rod locking system on the gantry crane 1, the transverse slope of the steel box girder 11 to be spliced is adjusted through adjusting the lifting height of the crane on the gantry crane 1, the steel box girder 11 to be spliced is moved to the position of 10mm at the edge of the spliced steel box girder 11 through a longitudinal positioning oil cylinder of the gantry crane 1, then the steps of waking up the transverse slope and adjusting the longitudinal slope are repeated, and then rough matching is carried out through arranging matching pieces on two adjacent steel box girders 11.
Referring to fig. 1-6, in a further preferred embodiment, the present invention further provides a bridge constructed by the portal crane 1 for bridge construction according to any of the above embodiments.
Referring to fig. 1-6, in a preferred embodiment, the bridge includes a lower tower column 41, a reinforced concrete joint section 20, a steel tower column 4 and a steel box girder 11, the lower tower column 41, the reinforced concrete joint section 20 and the steel tower column 4 are sequentially connected from bottom to top to form a Y-shaped structure, the lower tower column 41 and the reinforced concrete joint section 20 are connected to form a Y-shaped structure, the steel box girder 11 is connected to the steel tower column 4, the steel tower column 4 includes a first section 2, a second section 21, a third section 22 and a fourth section 23, the first section 2, the second section 21, the third section 22 and the fourth section 23 are sequentially connected from bottom to top to form the steel tower column 4, and the first section 2 and the second section 21 are both in an eight-shaped structure.
Referring to fig. 1-6, in a preferred embodiment, each section of the steel tower column 4 is provided with a matching alignment device and a guiding limiting plate, and the guiding limiting plates are arranged in a trapezoid structure; the matching alignment device and the guide limiting plate are respectively arranged at the outer side of each section, and are both used for matching connection between two adjacent sections in the steel tower column 4; the inner sides of the segments are also provided with connecting plates for alignment and connection between the segments of the steel tower column 4.
Referring to fig. 1-6, in a preferred embodiment, the bridge further comprises a gantry crane 1 and a rail arranged on the steel box girder 11, the gantry crane 1 is in sliding connection with the rail, and the rail is detachably connected with the steel box girder 11; the gantry crane 1 is provided with a rotary lifting appliance (or a rotatable lifting appliance) for adjusting or rotating the angle of a lifted object (90-360 degrees), and the lifting appliance is connected with a steel beam lifting lug through a pin shaft; in a preferred embodiment, the gantry crane 1 comprises a hydraulic lifting jack for enlarging the lifting height.
The portal crane 1 comprises a frame structure (main beam, cross beam), a lifting appliance, a shape-moving structure, a lifting point longitudinal and transverse movement mechanism, an anchoring device, a lifting winch, a hydraulic station, an electrical system, a supporting device and the like; Q460C is adopted as a main material of the metal structure, and Q355C is adopted as the rest connecting rod systems; the running structure mainly comprises a track, supporting legs, an oil cylinder jacking device, a jacking device and the like; the main beam of the lifting appliance on the portal crane 1 is provided with a plurality of interfaces for adapting to articles with different sizes.
The beneficial effects of the invention are as follows: the invention provides a portal crane construction method for bridge construction and a bridge, which have higher overall efficiency, larger construction period and more convenient installation compared with the traditional construction method.
The foregoing description is only of the preferred embodiments of the present invention, and is not intended to limit the scope of the invention, but rather is intended to cover any equivalents of the structures or equivalent processes disclosed herein or in the alternative, which may be employed directly or indirectly in other related arts.
Claims (10)
1. The construction method of the portal crane for the bridge construction is characterized by comprising the following steps of:
s1: constructing a steel tower and steel box girders at two ends of the steel tower, installing a track on the steel box girders and anchoring; constructing the portal crane when anchoring is completed;
s2: connecting the steel box girder to be spliced with the spliced steel box girder through a gantry crane, and performing wet joint construction between two adjacent steel box girders when the steel box girder to be spliced is connected with the spliced steel box girder;
s3: installing stay ropes on the steel box girder and performing pre-tensioning treatment;
s4: and repeating the steps S2-S3 until all the steel box girders are connected.
2. The method for constructing a portal crane for bridge construction according to claim 1, wherein the constructing of the portal crane in step S1 specifically comprises:
hoisting and constructing the landing legs of the gantry crane, and connecting the landing legs with the track when the construction is completed; the support structure is adopted to temporarily support the support leg; hoisting and constructing a main truss of the gantry crane, and installing the main truss and the bracket in a contraposition manner; after the alignment and installation are completed, installing the supporting mechanisms on the two sides of the supporting legs again; constructing a transverse connection on the steel box girder and constructing an installation platform on the side edge of the main truss at the same time; performing alignment installation on the transverse connection and the main truss, and performing disassembly treatment on the supporting mechanism after the alignment installation is completed;
hoisting and constructing a travelling crane mechanism, a crane trolley and an auxiliary structure; when the travelling mechanism is installed, measuring and rechecking a shape-changing track on the main truss, and fixing a buckling track of the travelling mechanism if a preset condition is met;
hoisting the trolley and arranging anti-skid wooden wedges on running wheels of the trolley; and (5) hoisting and constructing the auxiliary structure when the hoisting and constructing are completed, and completing the installation of the crane.
3. The portal crane construction method for bridge construction according to claim 1, wherein the specific step of connecting the steel box girder to be spliced and the spliced steel box girder in the step S2 comprises the steps of:
when the first section of the spliced steel box girder is spliced, the split of the gantry crane is started, the front supporting leg of the gantry crane is disassembled, the rest part of the gantry crane is supported, the front supporting leg is hoisted to a position with a preset interval between the front supporting leg and the rear supporting leg after being disassembled, the front supporting leg is spliced with the track and the rest part of the gantry crane, and a supporting structure is installed again after the splicing to fixedly support the front supporting leg; and splicing the longitudinal beam lengthening section with the original main beam of the gantry crane, disassembling the supporting structure when the splicing is completed, and hoisting and constructing the subsequent steel box girder.
4. The portal crane construction method for bridge construction according to claim 1, wherein the step S1 further comprises:
s11: carrying out an idle load test and a load test, and splicing the subsequent steel box girders after the idle load test and the load test meet preset conditions; the load test comprises an 80% rated load static load test, a 100% rated load static load test and a 125% rated load static load test.
5. The portal crane construction method for bridge construction according to claim 1, wherein the specific step of connecting the steel box girder to be spliced and the spliced steel box girder in the step S2 comprises the steps of:
when the steel box girder to be spliced and the spliced steel box girder are at the same horizontal height, the steel box girder to be spliced is close to the spliced steel box girder through a longitudinal moving oil cylinder on the gantry crane, when a preset interval is reserved between the steel box girder to be spliced and the spliced steel box girder, longitudinal slope and transverse slope adjustment of the steel box girder to be spliced are carried out through the gantry crane, and then the steel box girder to be spliced and the spliced steel box girder are connected.
6. The portal crane construction method for bridge construction according to claim 5, wherein the specific step of connecting the steel box girder to be spliced and the spliced steel box girder in the step S2 further comprises:
firstly, carrying out rough matching on the steel box girders to be spliced through a portal crane, and carrying out fine matching on the steel box girders when the rough matching processing is completed;
the rough matching processing steps specifically comprise: the steel box girders to be spliced are moved to 50mm positions of the edges of the spliced steel box girders through a longitudinal positioning oil cylinder of the gantry crane; then the longitudinal slope height of the steel box girder to be spliced is adjusted through a threaded rod locking system on the gantry crane, the transverse slope of the steel box girder to be spliced is adjusted through adjusting the lifting height of the crane on the gantry crane, the steel box girder to be spliced is moved to the position of 10mm on the edge of the spliced steel box girder through a longitudinal positioning oil cylinder of the gantry crane, then the steps of waking up the transverse slope and adjusting the longitudinal slope are repeated, and then rough matching is carried out through arranging matching pieces on two adjacent steel box girders.
7. Bridge, characterized in that it is constructed by the portal crane construction method for bridge construction according to any one of claims 1-6.
8. The bridge of claim 7, wherein the bridge comprises a lower tower column, a reinforced concrete combined section, a steel tower column and a steel box girder, wherein the lower tower column, the reinforced concrete combined section and the steel tower column are sequentially connected from bottom to top to form a Y-shaped framework, the lower tower column and the reinforced concrete combined section are connected to form a Y-shaped framework, the steel box girder is connected with the steel tower column, the steel tower column comprises a first section, a second section, a third section and a fourth section, the first section, the second section, the third section and the fourth section are sequentially connected from bottom to top to form the steel tower column, and the first section and the second section are of an eight-shaped structure.
9. The bridge of claim 8, wherein each segment of the steel tower column is provided with a matching alignment device and a guide limiting plate, and the guide limiting plates are arranged in a trapezoid structure; the matching alignment device and the guide limiting plate are respectively arranged at the outer side of each section, and are both used for matching connection between two adjacent sections in the steel tower column; the inner sides of the sections are also provided with connecting plates, and the connecting plates are used for aligning and connecting the sections of the steel tower column.
10. The bridge of claim 7, further comprising a gantry crane and a rail on the steel box girder, wherein the gantry crane is slidably connected to the rail, and wherein the rail is detachably connected to the steel box girder; the gantry crane is provided with a rotary lifting appliance for adjusting or rotating the angle of the lifted object.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311859196.5A CN117645240A (en) | 2023-12-30 | 2023-12-30 | Construction method of portal crane for bridge construction and bridge |
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| CN202311859196.5A CN117645240A (en) | 2023-12-30 | 2023-12-30 | Construction method of portal crane for bridge construction and bridge |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN119683488A (en) * | 2024-12-02 | 2025-03-25 | 保利长大工程有限公司 | A construction method for bridge deck gantry crane |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN119683488A (en) * | 2024-12-02 | 2025-03-25 | 保利长大工程有限公司 | A construction method for bridge deck gantry crane |
| CN119683488B (en) * | 2024-12-02 | 2026-01-06 | 保利长大工程有限公司 | A method for constructing a bridge-mounted gantry crane |
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