CN115198648A - Construction method for erecting multi-beam box girder by using single-boom bridge crane - Google Patents
Construction method for erecting multi-beam box girder by using single-boom bridge crane Download PDFInfo
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- CN115198648A CN115198648A CN202210848469.5A CN202210848469A CN115198648A CN 115198648 A CN115198648 A CN 115198648A CN 202210848469 A CN202210848469 A CN 202210848469A CN 115198648 A CN115198648 A CN 115198648A
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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
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling 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
- E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
- E01D2/04—Bridges characterised by the cross-section of their bearing spanning structure of the box-girder type
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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
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
- E01D21/06—Methods or apparatus specially adapted for erecting or assembling bridges by translational movement of the bridge or bridge sections
Abstract
The invention provides a construction method for erecting a multi-beam box girder by using a single-boom bridge crane, which relates to the technical field of railway bridge construction and comprises the following steps: when the distance between the pier support pads is equal to the preset distance, the single-arm bridge girder erection machine completes via holes by adopting a four-leg via hole method; hoisting a box girder by a hoisting trolley of the single-arm bridge girder erection machine; when the distance between the bridge pier support pads is smaller than the preset distance, detaching the front auxiliary support leg of the single-arm bridge girder erection machine, lengthening the arm of the single-arm bridge girder erection machine, and completing via holes by adopting a balanced via hole method; a transition shoulder pole is arranged on a hanging beam shoulder pole of the trolley, and the trolley hoists the box girder through the transition shoulder pole; the preset distance is the width of the front auxiliary supporting leg. According to the invention, two bridge erecting machines of different types are not required to be adopted on the construction line, so that the equipment and construction cost can be reduced, the construction efficiency is improved, the project progress is accelerated, and the bridge erecting machines can be universally used when box girders of passenger dedicated lines and intercity railways are erected.
Description
Technical Field
The invention relates to the technical field of railway bridge construction, in particular to a construction method for erecting a multi-beam box girder by using a single-boom bridge crane.
Background
At present, railways with the speed of 200km/h to 350km/h in China are commonly called passenger dedicated lines, the passenger dedicated lines usually adopt a bridge form in a large quantity, box girders of the passenger dedicated lines generally comprise two different types of standard girders, namely single-line box girders and double-line box girders, the weight of the single-line box girders is usually less than 550t, the width of the single-line box girders is less than 7.6m, the weight of the double-line box girders is usually less than 1000t, the width of the double-line box girders is less than 12.6m, intercity railways also belong to the category of the passenger dedicated lines, but the weight of the box girders is smaller than that of box girders of the corresponding type of the passenger dedicated lines and belongs to non-standard girders, and because the appearance sizes and weights of different box girders, the size and bearing capacity of piers for supporting different box girders are different, and different types of box girders are usually required to be erected by different types of bridge erecting machines.
However, in the same project construction, two different types of box girders, namely a single-line box girder and a double-line box girder, are usually erected on a construction line, two different types of equipment, namely a single-line bridge girder erection machine and a double-line bridge girder erection machine, need to be adopted, equipment and construction cost are high, meanwhile, the two types of bridge girder erection machines are usually used on different construction road sections, frequent switching is needed, construction efficiency is affected, one bridge girder erection machine is wasted when the other bridge girder erection machine is left idle for a long time during construction, and in addition, the common use of the bridge girder erection machines is difficult to realize when box girders of passenger dedicated lines and intercity railways are erected.
Disclosure of Invention
The invention solves the problem of how to adopt one bridge erecting machine to erect box girders of different types, thereby reducing the construction cost and improving the construction efficiency.
In order to solve the problems, the invention provides a construction method for erecting a multi-beam box girder by using a single-boom bridge crane, which comprises the following steps:
when the distance between the support pads of the bridge piers is equal to the preset distance, the single-arm bridge girder erection machine completes hole passing by adopting a four-leg hole passing method;
the hoisting trolley of the single-arm bridge girder erection machine hoists the box girder;
when the distance between the bridge pier support cushions is smaller than the preset distance, detaching the front auxiliary support leg of the single-arm bridge girder erection machine, lengthening the arm of the single-arm bridge girder erection machine, and completing via holes by adopting a balanced via hole method;
installing a transition carrying pole on a hanging beam carrying pole of the crane trolley, and hoisting the box girder by the crane trolley through the transition carrying pole;
the preset distance is the width of the front auxiliary supporting leg.
Optionally, the four-leg via method includes:
after the single-arm bridge girder erection machine is installed in place or girder erection is completed, the front supporting leg and the positioning pin between the middle supporting leg and the machine arm of the single-arm bridge girder erection machine are removed, and hole passing is prepared;
the front supporting leg and the middle supporting leg simultaneously drive the horn to move forwards for a first distance, and the hoisting trolley synchronously retreats to a position which is a second distance away from the tail end of the horn;
supporting a rear supporting leg of the single-arm bridge girder erection machine, retracting the middle supporting leg, moving forwards for a third distance and then supporting the middle supporting leg;
the rear supporting leg is retracted, the horn is driven to move forwards for a fourth distance until the front auxiliary supporting leg moves to the next pier position, and the front auxiliary supporting leg is supported on the pier at the pier position;
supporting the rear supporting leg, and folding the middle supporting leg and moving forwards for a fifth distance to support the middle supporting leg;
and (3) the front support leg is collected, the front support leg automatically moves forwards for a sixth distance to a next pier position and then is supported on the pier of the pier position, the front auxiliary support leg is collected, the hoisting trolley moves to the rear of the middle support leg to prepare a frame beam, and the hole passing is completed.
Optionally, the balanced via method includes:
after the single-arm bridge girder erection machine is installed in place or girder erection is completed, the front supporting leg and the positioning pin between the middle supporting leg and the machine arm of the single-arm bridge girder erection machine are removed, and hole passing is prepared;
the front supporting leg and the middle supporting leg simultaneously drive the driving arm to move forwards to the position above the pier of the next pier position, and the hoisting trolley synchronously retreats to the position close to the rear supporting leg of the single-arm bridge girder erection machine;
supporting the rear supporting leg, collecting the middle supporting leg, moving the middle supporting leg forwards to a preset supporting position, and supporting the middle supporting leg;
and (4) the front supporting leg is folded, the front supporting leg is automatically moved forwards to the next pier position and then is supported on the pier at the pier position, and the via hole is completed.
Optionally, the distance between the hanging holes of the transition carrying pole is matched with the distance between the hanging holes of the box girder.
Optionally, the construction method for erecting the multi-beam box girder by using the single-boom bridge crane further includes:
when the single-arm bridge girder erection machine passes through the single-line tunnel, the middle supporting leg of the single-arm bridge girder erection machine is rotated until the width of the single-arm bridge girder erection machine is matched with the size of the single-line tunnel.
Optionally, the rotating the middle support leg of the single-arm bridge girder erection machine until the width of the single-arm bridge girder erection machine matches the size of the single-line tunnel comprises:
the middle supporting leg integrally rotates for a first angle by taking the curved beam of the single-arm bridge girder erection machine as an axis.
Optionally, the first angle ranges from 0 to 75 degrees.
Optionally, the rotating the middle support leg of the single-arm bridge girder erection machine until the width of the single-arm bridge girder erection machine matches the size of the single-line tunnel further includes:
and a middle supporting leg cylinder of the middle supporting leg rotates a second angle relative to the cross beam of the middle supporting leg by taking the vertical direction as an axis.
Optionally, the plate of the single-arm bridge girder erection machine is a high-strength steel plate.
Optionally, a reinforcing structure is arranged at a position, corresponding to the support pad of the box girder, at the bottom of the middle supporting leg of the single-arm bridge girder erection machine.
Compared with the prior art, the invention has the following beneficial effects:
when two different types of box girders, namely a single-line box girder and a double-line box girder, are erected on a construction line of a passenger special line, the weight and the size of the double-line box girder are large, the weight and the size of the single-line box girder are small, and the pier of the double-line box girder needs higher load capacity, so that the distance between the pier supports of the double-line box girder is large, the distance between the pier supports of the single-line box girder is small, the width of a front auxiliary support leg of a single-arm bridge girder is generally matched with the distance between the pier supports of the double-line box girder, when the double-line box girder is erected at a double-line section, the distance between the pier supports is equal to a preset distance (namely the width of the front auxiliary support leg), at the moment, four stand columns of the single-arm bridge girder erection machine can be used for completing via holes by adopting a four-leg via hole method, and the double-line box girder is hoisted by a crane trolley, after the box girder of the double-line section is erected, the single-line box girder is completed, the single-arm bridge girder erection can be completed by adopting a single-arm bridge girder hoisting transition method, and the cost of the crane can be reduced by adopting a trolley hoisting trolley.
Meanwhile, in the construction connection process of the double-line section and the single-line section, only the front auxiliary supporting legs and the transition carrying poles need to be disassembled and assembled, and compared with the situation that the whole machine needs to be disassembled and assembled when different types of bridge erecting machines are replaced (firstly, one bridge erecting machine is disassembled from the line, and then the other bridge erecting machine is installed on the line), the method can reduce the workload and the cost of workers, save the operation time, improve the construction efficiency and accelerate the project development.
In addition, when the construction line is an intercity railway line, the distance between the two-line box girders and the single-line box girder of the intercity railway box girder is smaller than the preset distance (namely the width of the front auxiliary supporting leg) in size and weight, so that the distance between the pier supports of the intercity railway box girder is also smaller than the preset distance, at the moment, the front auxiliary supporting leg of the single-arm bridge girder erection machine is only needed to be detached, the arm of the single-arm bridge girder erection machine is lengthened, the through hole is completed by adopting a balanced type through hole method, the transition carrying pole is installed on the hanging beam carrying pole of the crane trolley, and the intercity railway box girder can be hoisted by the crane trolley through the transition carrying pole, so that the single-arm bridge girder erection machine can realize universality when erecting the box girders of a special line and the intercity railway, and the construction cost is reduced.
Drawings
FIG. 1 is a diagram illustrating a state of step 110 according to an embodiment of the present invention;
FIG. 2 is a diagram illustrating the state of step 120 according to an embodiment of the present invention;
FIG. 3 is a diagram illustrating the state of step 130 according to an embodiment of the present invention;
FIG. 4 is a state diagram of step 140 according to an embodiment of the present invention;
FIG. 5 is a diagram illustrating a state of step 150 in an embodiment of the present invention;
FIG. 6 is a diagram illustrating the state of step 160 according to an embodiment of the present invention;
FIG. 7 is a diagram illustrating the state of step 210 according to an embodiment of the present invention;
FIG. 8 is a diagram illustrating the state of step 221 in an embodiment of the present invention;
FIG. 9 is a state diagram of step 222 according to an embodiment of the present invention;
FIG. 10 is a diagram illustrating the state of step 223 in an embodiment of the present invention;
FIG. 11 is a diagram illustrating the state of step 230 in the embodiment of the present invention;
FIG. 12 is a diagram illustrating the state of step 240 according to an embodiment of the present invention;
FIG. 13 is a schematic structural view of a front auxiliary leg in an embodiment of the present invention;
FIG. 14 is a schematic structural view of a front leg in an embodiment of the present invention;
FIG. 15 is a schematic structural view of a center leg in an embodiment of the present invention;
FIG. 16 is a schematic structural view of a rear leg in an embodiment of the present invention;
FIG. 17 is a schematic structural view of a lift truck according to an embodiment of the present invention;
FIG. 18 is a schematic structural view of a curved beam in an embodiment of the present invention;
FIG. 19 is a schematic structural view of a transition carrying pole in an embodiment of the present invention;
fig. 20 is a schematic view of another perspective of the transition carrying pole in the embodiment of the present invention.
Description of the reference numerals:
10. a front auxiliary leg; 11. a front leg; 12. a middle support leg; 121. a middle leg cylinder; 122. a middle support leg upper cross beam; 123. a middle support leg lower cross beam; 13. a rear leg; 14. a boom; 15. a trolley; 151. carrying a shoulder pole by a hanging beam; 16. a curved beam; 2. and (4) transition carrying pole.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below.
In the description of the present invention, it is to be understood that the forward direction of "X" in the drawings represents the left direction, and correspondingly, the reverse direction of "X" represents the right direction; the forward direction of "Y" represents forward, and correspondingly, the reverse direction of "Y" represents rearward; the forward direction of "Z" represents the upward direction, and correspondingly, the reverse direction of "Z" represents the downward direction, and the directions or positional relationships indicated by the terms "X", "Y", "Z", etc. are based on the directions or positional relationships shown in the drawings of the specification, and are only for convenience of describing and simplifying the description, but do not indicate or imply that the device or element referred to must have a particular direction, be constructed and operated in a particular direction, and thus should not be construed as limiting the present invention.
The terms "first", "second" and "third", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
In order to solve the above problems, an embodiment of the present invention provides a construction method for erecting a multi-beam box girder by using a single-boom bridge crane, including: when the distance between the support pads of the bridge piers is equal to the preset distance, the single-arm bridge girder erection machine completes hole passing by adopting a four-leg hole passing method; the hoisting trolley 15 of the single-arm bridge girder erection machine hoists the box girder; when the distance between the bridge pier support cushions is smaller than the preset distance, detaching the front auxiliary supporting leg 10 of the single-arm bridge girder erection machine, lengthening the horn 14 of the single-arm bridge girder erection machine, and completing via holes by adopting a balanced via hole method; installing a transition carrying pole 2 on a hanging beam carrying pole 151 of the crane trolley 15, and hoisting the box girder by the crane trolley 15 through the transition carrying pole 2; the preset distance is the width of the front auxiliary leg 10.
As shown in fig. 3 and 13 to 18, in this embodiment, the single-arm bridge girder erection machine for erecting a double-line box girder and a single-line box girder on a construction line mainly comprises a front auxiliary leg 10, a front leg 11, a middle leg 12, a rear leg 13, a boom 14, a front and rear crane trolley 15, a curved beam 16, a traveling mechanism, a power bracket, a hydraulic system, an electrical control system, a safety monitoring system, and the like.
As shown in fig. 3, the horn 14 is a plate-spliced box girder structure, an upper ear beam and a lower ear beam are arranged on the plate-spliced box girder structure, the horn 14 is manufactured in sections and connected by a pin shaft, a rack is arranged on the horn 14 to form a walking mechanism, double rows of racks laid on the bottom surface of the horn 14 are used for driving a crane trolley 15 and a front supporting leg 11 to walk, two rows of racks laid on the side surface of the upper ear beam of the rear three sections of the horn 14 are used for driving a middle supporting leg 12 to walk, and an oil tank is arranged in the last section of the horn 14 and used for storing oil for the generator set.
As shown in fig. 13, the front auxiliary leg 10 mainly includes an upper cross beam of the front auxiliary leg, an upper column of the front auxiliary leg, a lower column of the front auxiliary leg, a horizontal connection, a ladder platform, etc., the upper cross beam of the front auxiliary leg straddles on the horn 14 and is movably connected to the horn 14, and can move back and forth on the horn 14 through the driving of a rack and pinion, so as to realize a span-variable beam, the upper columns of the two front auxiliary legs are respectively connected to two ends of the upper cross beam of the front auxiliary leg, the upper end of the lower column of the front auxiliary leg is connected to the lower end of the upper column of the front auxiliary leg, the upper column of the front auxiliary leg and the lower column of the front auxiliary leg both adopt a structure composed of a guide post, a guide sleeve and a jacking cylinder, and both can be extended and retracted in a height direction under the action of their respective jacking cylinders, so as to realize single-stage multiple extension and retraction, under a normal condition, the highest height of the front auxiliary leg 10 is 15.9m, and the lowest height is 4.4m.
The cross connection sets up the front side under the column under the zero number, and its both ends are connected with the guide pin bushing of the column under two preceding auxiliary leg of left and right sides respectively, thereby form the half surrounding structure that a transversal personally submits the U-shaped, the ladder platform sets up on the guide pin bushing outer wall of the column on preceding auxiliary leg, the guide pin bushing of the column is when crossing the tunnel under preceding auxiliary leg, need unpack connecting bolt apart, outwards overturn with the chain inversion, the column width of preceding auxiliary leg 10 has 6.11m usually, three kinds of sizes of 6m and 5.4m, can change the column of different widths according to the base stone width of every operating mode pier, thereby the width of auxiliary leg 10 before the adjustment, so that the column of preceding auxiliary leg 10 is supported and is cushioned on the base stone as far as possible.
As shown in fig. 12, the width of the front auxiliary leg 10 is a distance between center points of lower end surfaces of the left and right front auxiliary leg lower guide posts in the X-axis direction.
As shown in fig. 14, the front leg 11 is a single-stage telescopic portal column structure, and is a main stressed member in girder erection, and mainly includes an upper sliding beam, a front leg driving structure, a front leg cylinder, a front leg middle cross beam, a front leg lower cross beam, and a front leg diagonal brace, and when the front leg 11 and the front auxiliary leg 10 are simultaneously supported on the same bridge pier, the left and right cylinders of the front leg 11 are located between the left and right cylinders of the front auxiliary leg 10.
The upper portion of the upper sliding beam is provided with a change gear structure movably connected with the bottom surface of the machine arm 14, two sets of XTK500 type low clearance heavy-duty multi-roller walking structures are further arranged between the upper sliding beam and the bottom surface of the machine arm 14, a front supporting leg driving structure is arranged in the middle of the upper sliding beam and can drive the machine arm 14 to move forwards or backwards and a front supporting leg 11 to move automatically, the front supporting leg body is divided into an upper layer and a lower layer, two layers of columns are of structures formed by guide columns, guide sleeves and jacking oil cylinders, the total adjusting amount of the upper layer of columns is 5.7m, the adjusting height is 300mm, the adjusting amount of the lower layer of columns is 1.5m, the lower layer of columns is adjusted under the working condition of large downhill slope, when the lower layer of columns is completely retracted, the front supporting leg body is connected with the lower cross beam through bolts, pin shafts on the lower layer of columns are detached, and under other working conditions, the upper telescopic structure is mainly adjusted. The upper sliding beam is rotatably connected with the change gear structure, the upper sliding beam is also provided with two walking oil cylinders, when the two walking oil cylinders simultaneously extend and retract, the upper sliding beam can be driven to move relative to the machine arm 14, when one of the two walking oil cylinders extends and retracts, the upper sliding beam can rotate relative to the change gear structure, and the box girder can be erected at a small curve section.
As shown in fig. 15, the middle leg 12 is a four-column two-stage telescopic structure, and is composed of a middle leg column 121, a middle leg upper cross beam 122, a middle leg lower cross beam 123, a distribution beam, an operation chamber, a platform, a ladder and the like, the middle leg upper cross beam 122 includes two parallel long beam bodies, the distribution beam includes a parallel short beam body, the distribution beam is disposed between the two long beam bodies, two ends of the distribution beam are respectively connected with the two long beam bodies, an upper rotating structure of the curved beam 16 is disposed in a space formed by the distribution beam and the middle leg upper cross beam 122 and connected with the distribution beam, the middle leg column 121 is a structure composed of a guide column, a guide sleeve and a jacking cylinder, the height of the middle leg column is 4.9m, and the adjustment amount is 300mm.
When the middle supporting leg 12 is supported on the supporting pad of the single-line box girder, because the supporting pad interval of the single-line box girder is small, in order to reduce the local load of the single-line box girder, as shown in fig. 15, a reinforcing structure can be arranged at a position corresponding to the supporting pad of the single-line box girder at the bottom of the middle supporting leg lower beam 123 of the middle supporting leg 12, so as to increase the bearing capacity of the supporting pad of the single-line box girder, and exemplarily, the reinforcing structure can be a reinforcing rib or a reinforcing plate.
As shown in fig. 16, the rear leg 13 is composed of a rear leg upper beam, a rear leg cylinder, a rear leg middle beam, a rear leg lower beam, a rear leg diagonal support, a rotating arm, a turning cylinder, a hinge base and the like, the rear leg body is of a structure composed of a guide pillar, a guide sleeve and a jacking cylinder, the total expansion amount is 5.4M, the adjustment amount is 300mm, during beam erection, the rear leg lower beam can be supported on a rear frame of the beam transporting vehicle, backward turning can be realized by the turning cylinder for 90 degrees during beam transporting operation, during hole passing, the rear leg diagonal support and a power bracket on the arm 14 can form a rigid support, and flanges between the hinge base and the arm 14 and between the rear leg body are fixedly connected by M24 bolts.
As shown in fig. 3 and 17, the crane trolley 15 is composed of an upper trolley body and a lower hanging beam carrying pole, the trolley body is arranged at the bottom of the machine arm and is in driving connection with the machine arm through a double-row rack laid on the bottom surface of the machine arm 14, the trolley body can drive the machine arm 14 to longitudinally move through a hole when being pinned with the curved beam 16, a hanging beam carrying pole 151 is connected below the trolley body through a steel wire rope, the hanging beam carrying pole 151 can be used for hanging a box girder through a hanging rod, or when the hanging hole pitch of the hanging beam carrying pole 151 is not matched with the hanging hole pitch of the box girder, the transition carrying pole 2 can be additionally arranged at the bottom of the hanging beam carrying pole 151, the bottom of the hanging beam carrying pole 151 is provided with a mounting hole, as shown in fig. 19 and 20, the upper end surface of the transition carrying pole 2 is provided with a hanging lug, the hanging lug can be connected with the mounting hole on the hanging beam carrying pole 151 through a pin shaft, the hanging hole pitch of the transition carrying pole 2 is matched with the hanging hole pitch of the box girder, and thus the hanging pole can be arranged in the hanging hole of the box girder 2; the trolley 15 comprises a front trolley and a rear trolley, the front trolley is stressed in a single point mode, a single steel wire rope is used for penetrating and winding the left winding drum and the right winding drum to meet the self-balancing requirement, the rear trolley is stressed in a two-point mode, and two steel wire ropes are used for penetrating and winding the left winding drum and the right winding drum.
As shown in fig. 18, the curved beam 16 includes a bracket trolley connected to the upper ear beam side of the boom 14 through a rack and pinion and an upper rotating structure provided on the bracket trolley, the upper rotating structure is connected to the distribution beam of the middle leg 12 as a whole and can rotate around a vertical axis relative to the bracket trolley, four sets of XTK300 type low-clearance heavy-load multi-roller walking structures are provided on the bracket trolley of the curved beam 16, the hanging hinge pin can meet the requirements of the hanging weight of the boom 14 and the hinge load during passing through the hole, and a curved beam driving structure is further provided on the curved beam 16, and the curved beam driving structure can drive the boom 14 or the middle leg 12 to move during passing through the hole.
As shown in fig. 3, the power bracket is arranged on the last section of the horn 14 for installing the generator set, the power bracket is further provided with the hydraulic pump station of the electric control cabinet and the rear support leg 13, the structures are arranged on the last section of the horn 14, the single-arm bridge erecting machine is convenient to complete the via hole by adopting a balanced via hole method, and the tail part of the power bracket is further provided with a rear support leg inclined support pin penetrating oil cylinder connecting seat.
It should be noted that the bridge girder erection machine adopts a single-arm structural form, the interior of the plate-spliced box girder structure connected into the machine arms 14 is hollow, a large number of plates adopt high-strength steel plates, and the original Q355B steel plate is replaced by a Q690D steel plate, so that the overall strength of the single-arm bridge girder erection machine can be improved under the condition of reducing the self weight of the single-arm bridge girder erection machine, the strength requirement when the double-line box girder is hoisted can be met, and the load requirement of a bridge pier can be met when the bridge girder erection machine stands on the bridge pier with smaller bearing capacity; in addition, when the single-arm bridge crane adopts the balanced via-hole method for via-hole, because the horn 14 is manufactured in a segmented manner and is connected by the pin shaft, the center of gravity of the single-arm bridge crane can be controlled at the rear side of the middle leg 12 before the front leg 11 is supported on the pier of the next pier position by lengthening the horn 14, and the length of the horn 14 at the front side part of the middle leg 12 can still meet the via-hole requirement.
Thus, when two different types of box girders, namely a single-line box girder and a double-line box girder, are erected on a construction line of a passenger special line, because the weight and the size of the double-line box girder are large, the weight and the size of the single-line box girder are small, and the pier of the double-line box girder needs higher load capacity, the distance between the pier supporting pads of the double-line box girder is large, the distance between the pier supporting pads of the single-line box girder is small, the width of the front auxiliary supporting leg 10 of the single-arm bridge erecting machine is generally matched with the distance between the pier supporting pads of the double-line box girder, when the double-line box girder is erected on a double-line section, the distance between the pier supporting pads is equal to the preset distance (namely the width of the front auxiliary supporting leg 10), at the moment, four columns of the single-arm bridge erecting machine can be used for completing via holes by adopting a four-leg via hole method, and hoisting the double-line box girder by the trolley 15, after the box girder of the double-line section is erected, because the bridge pier interval of the single-line section is smaller than the preset interval (namely the width of the front auxiliary supporting leg 10), the front auxiliary supporting leg 10 can not be supported on the bridge pier of the single-line box girder, at the moment, only the front auxiliary supporting leg 10 of the single-arm bridge girder erection machine needs to be removed, the horn 14 of the single-arm bridge girder erection machine is lengthened, the via hole is completed by adopting a balanced via hole method, then the transition shoulder pole 2 is installed on the hanging beam shoulder pole 151 of the trolley 15, and the trolley 15 can hoist the single-line box girder by the transition shoulder pole 2, so that two bridge girders of different types do not need to be adopted on a construction line, and the equipment and construction cost can be reduced.
Meanwhile, in the construction connection process of the double-line section and the single-line section, only the front auxiliary supporting legs 10 and the transition carrying poles 2 need to be disassembled and assembled, and compared with the situation that the whole machine needs to be disassembled and assembled when different types of bridge erecting machines are replaced (one bridge erecting machine is disassembled from the line at first, and the other bridge erecting machine is installed on the line), the method can reduce the workload and the cost expenditure of workers, save the operation time, improve the construction efficiency and accelerate the project progress.
In addition, when the construction line is an inter-city railway line, the distance between the two-line box girders and the single-line box girder of the inter-city railway box girder is smaller than the preset distance (namely the width of the front auxiliary supporting leg 10) in terms of size and weight, so that the distance between the bridge piers of the inter-city railway box girder is also smaller than the preset distance, at the moment, the front auxiliary supporting leg 10 of the single-arm bridge girder erection machine is only needed to be removed, the arm 14 of the single-arm bridge girder erection machine is lengthened, the through hole is completed by adopting a balanced type through hole method, the transition carrying pole 2 is installed on the hanging beam carrying pole 151 of the trolley 15, and the inter-city railway box girder can be hoisted by the trolley 15 through the transition carrying pole 2, so that the single-arm bridge girder erection machine can be used universally when the inter-city railway box girders and the passenger railway box girders are erected, and the construction cost is reduced.
Optionally, the four-leg via method includes:
step 110, after the single-arm bridge girder erection machine is installed in place or girder erection is completed, the positioning pins between the front supporting leg 11 and the middle supporting leg 12 of the single-arm bridge girder erection machine and the machine arm 14 are removed, and via holes are prepared;
specifically, as shown in fig. 1, in this embodiment, taking an example that a single boom bridge crane just erects a section of double-line box girder on a construction line of a passenger dedicated line as an example, a boom 14 of the single boom bridge crane is fixed by a positioning pin between a front leg 11 and a middle leg 12, the front leg 11 is supported on a double-line pier, the middle leg 12 is supported at the front of the double-line box girder at a previous hole, at this time, the positioning pin can be released, so that the boom 14 can move relative to the front leg 11 and the middle leg 12, and the front auxiliary leg 10 and the rear leg 13 can move along with the boom 14 in a retracted state to prepare for passing a hole.
The preparation work of the single-arm bridge girder erection machine is similar to the steps when the single-arm bridge girder erection machine is used for erecting a first-hole double-line box girder on a construction line of a passenger dedicated line, and the difference is that the single-arm bridge girder erection machine is firstly carried to the position of the box girder to be erected by a girder transportation vehicle, front support legs 11 are supported on a first-hole double-line pier, middle support legs 12 are supported on a laid road section, the front girder transportation vehicle is hoisted to the back of the middle support legs 12 by a hoisting trolley 15, and after the front girder transportation vehicle and the rear girder transportation vehicle are withdrawn from the lower part of the single-arm bridge girder erection machine, positioning pins are removed to prepare for passing holes.
Step 120, the front support leg 11 and the middle support leg 12 simultaneously drive the horn 14 to move forward for a first distance, and the trolley 15 synchronously retreats to a position which is a second distance away from the tail end of the horn 14;
specifically, as shown in fig. 2, for an exemplary explanation, a double-line box girder is erected on a passenger dedicated line construction line by a single-boom bridge crane, when a 40m double-line box girder is erected, the hole distance between two adjacent double-line piers is 40m, the front leg 11 and the middle leg 12 simultaneously drive the boom 14 to move forward by 20m, and the trolley 15 synchronously retreats to a position 4m away from the tail end of the boom 14; when a 32m double-line box girder is erected, the hole distance between two adjacent double-line piers is 32m, the front support leg 11 and the middle support leg 12 simultaneously drive the horn 14 to move forwards by 20m, and the hoisting trolley 15 synchronously retreats to a position 4m away from the tail end of the horn 14.
Step 130, supporting a rear supporting leg 13 of the single-arm bridge girder erection machine, folding the middle supporting leg 12, moving forwards for a third distance, and then supporting the middle supporting leg 12;
illustratively, as shown in fig. 3, when erecting a 40m double-line box girder, the middle leg 12 is moved forward by 19m and supported at the rear side of the middle portion of the double-line box girder erected at the upper hole; when erecting a 32m double line box girder, the middle leg 12 is moved forward by 11m and supported at the rear side of the middle portion of the double line box girder erected at the upper hole.
Step 140, retracting the rear supporting leg 13, and driving the horn 14 to move forward by a fourth distance until the front auxiliary supporting leg 10 moves to a next pier position, so as to support the front auxiliary supporting leg 10 on a pier at the pier position;
illustratively, as shown in fig. 4, when erecting a 40m double-line box girder, the driving horn 14 moves forward by 20.7m to support the front auxiliary leg 10 on the double-line pier at the pier position when the front auxiliary leg 10 moves to the next pier position; when a 32m double-line box girder is erected, the driving horn 14 moves forwards by 12.7m until the front auxiliary leg 10 moves to the next pier position, and the front auxiliary leg 10 is supported on the double-line pier at the pier position.
150, supporting the rear supporting leg 13, and collecting the middle supporting leg 12 and moving forwards for a fifth distance to support the middle supporting leg 12;
illustratively, as shown in fig. 5, when a 40m double-line box girder is erected, the rear supporting leg 13 is supported, the middle supporting leg 12 is retracted, and the rear supporting leg 12 is moved forwards by 21.7 m; when erecting a 32m double line box girder, the rear support leg 13 is supported, the middle support leg 12 is retracted and moved forward by 21.7m to support the middle support leg 12, at this time, the middle support leg 12 is supported at the front part of the erected double line box girder at the upper hole, and the middle support leg 12 is moved to the position.
And 160, collecting the front supporting leg 11, supporting the front supporting leg 11 on the pier at the pier position after the front supporting leg 11 moves forwards by a sixth distance to the next pier position, collecting the front auxiliary supporting leg 10, moving the crane trolley 15 to the rear of the middle supporting leg 12 to prepare for erecting a beam, and completing hole passing.
Illustratively, as shown in fig. 6, when a 40m double-line box girder is erected, the front leg 11 is retracted, the front leg 11 is moved forward by itself by 40.7m, when a 32m double-line box girder is erected, the front leg 11 is retracted, the front leg 11 is moved forward by itself by 32.7m, the front leg 11 is supported after being in place, the front leg 11 is moved into place, the front auxiliary leg 10 is retracted by penetrating through the front leg 11 and the positioning pins of the middle leg 12 and the horn 14, the crane trolley 15 is opened behind the middle leg 12 to prepare for erecting the girder, and the process is completed.
It should be noted that, the above is only exemplified by the step of passing through holes when erecting double-line box girders of 40m and 32m, the single-boom bridge crane can also be used for erecting double-line box girders of other spans below 40m, except that the moving distance in each step is different when erecting, and specifically, the moving distance can be adaptively set according to the span of the double-line box girders to be erected, which is not limited herein.
Optionally, the balanced via method includes:
step 210, after the single-arm bridge girder erection machine is installed in place or girder erection is completed, removing the front supporting legs 11 and the positioning pins between the middle supporting legs 12 and the machine arms 14 of the single-arm bridge girder erection machine, and preparing for via holes;
specifically, as shown in fig. 7, in this embodiment, a double-line box girder for completing a section of a double-line section is just erected on a construction line of a passenger dedicated line by a single-boom-type bridge crane, and a first-hole single-line box girder for erecting a single-line section is taken as an example for illustration, at this time, the initial state and the preparation work of the single-boom-type bridge crane are similar to those of the four-leg-via-method via hole, except that the front auxiliary leg 10 is removed from the single-boom-type bridge crane, and the boom 14 is lengthened.
Step 220, the front support legs 11 and the middle support legs 12 simultaneously drive the jib 14 to move forwards to the position above the pier of the next pier position, and the crane trolley 15 synchronously retreats to the position close to the rear support legs 13;
specifically, taking an example that a single-boom bridge crane erects a 32m single-line box girder on a construction line of a passenger dedicated line, as shown in fig. 8, 9 and 10, the implementation of the method is performed in three steps above a bridge pier where the front outrigger 11 and the middle outrigger 12 simultaneously drive the horn 14 to move forward to the next pier position, and includes:
step 221, the front supporting leg 11 and the middle supporting leg 12 simultaneously drive the horn 14 to move forward by 28m;
step 222, supporting the rear supporting legs 13, collecting the middle supporting legs 12, moving forward by 11m, and supporting the middle supporting legs 12;
and step 223, collecting the rear supporting legs 13, and driving the horn to move forward by 4.7m.
Therefore, when a single-line box girder on a construction line of a passenger dedicated line is erected, the horn 14 is moved forwards to the position above the pier of the next pier position in a distributed manner, so that the risk of the single-boom bridge crane during hole passing can be reduced, and the safety is improved.
Step 230, supporting the rear supporting legs 13, collecting the middle supporting legs 12, moving the middle supporting legs forward to a preset supporting position, and supporting the middle supporting legs 12;
illustratively, as shown in fig. 11, the rear leg 13 is supported, the middle leg 12 is retracted and moved forward by 21.7m, and the middle leg 12 is supported.
And 240, collecting the front supporting leg 11, moving the front supporting leg 11 forwards to the next pier position by self, and supporting the front supporting leg 11 on the pier at the pier position, so that the hole passing is completed.
Illustratively, as shown in fig. 12, the front leg 11 is retracted, the front leg 11 is moved forward by 32.7m, and after reaching the right position, the front leg 11 is inserted, and the front leg 11 and the positioning pin between the middle leg 12 and the horn 14 are passed through, so as to complete the process.
It should be noted that, the above is exemplified by a step of passing through a hole when erecting a 32m single-line box girder, the single-arm bridge crane may also be used for erecting single-line box girders with other spans below 32m, and the difference is that the moving distance in each step is different during the erection, and specifically, the moving distance may be adaptively set according to the span of the double-line box girder to be erected, which is not limited herein.
In addition, the single-boom bridge crane can also be used for erecting intercity railway box girders of different types such as 35m (with the weight of 620 t), 30m and 25m, the step of passing through the holes is similar to that of the step of passing through the holes when erecting a 32m single-track box girder, and the difference is that when the step of erecting the intercity railway box girders is completed by adopting a balanced type passing through method, when the front supporting leg 11 and the middle supporting leg 12 simultaneously drive the horn 14 to move forwards to the position above the pier of the next pier in the step 220, the horn 14 can directly complete the movement of one pitch of holes at one time, and when the middle supporting leg 12 moves forwards to the preset supporting position in the step 230, the middle supporting leg 12 can also directly complete the movement of one pitch of holes at one time, so that the construction efficiency can be improved.
Optionally, the construction method for erecting the multi-beam box girder by using the single-boom bridge crane further includes:
when the single-arm bridge girder erection machine passes through the single-line tunnel, the middle supporting leg 12 of the single-arm bridge girder erection machine is rotated until the width of the single-arm bridge girder erection machine is matched with the size of the single-line tunnel.
Under the normal condition, in order to avoid losing the load capacity of the single-arm bridge girder erection machine as much as possible, the aim of erecting a box girder with larger weight is fulfilled as much as possible under the condition of reducing the self weight, the middle support leg of the single-arm bridge girder erection machine is usually arranged to be matched with the size of a double-line box girder as much as possible, the width of the middle support leg is the maximum width of the single-arm bridge girder erection machine, and the single-arm bridge girder erection machine has the risk of not passing through the single-line tunnel because the width of the single-line tunnel is smaller than that of the double-line tunnel.
In order to solve the above problems, as shown in fig. 3, fig. 15 and fig. 18, in the present embodiment, since the middle leg 12 of the single-arm bridge girder erection machine is rotatably connected with the arm 14 through the curved beam 16, when the single-arm bridge girder erection machine passes through the single-line tunnel, the width from the middle leg 12 of the rotatable single-arm bridge girder erection machine to the single-arm bridge girder erection machine matches the size of the single-line tunnel.
As shown in fig. 15, two side portions of the middle leg upper cross beam 122 of the middle leg 12 may be of a structure with inclined planes, and may be provided as an arc-surface structure matching with the shape of the top of the tunnel on the premise of meeting the strength requirement in practical application.
Optionally, the rotating the middle support leg 12 of the single-arm bridge girder erection machine to match the width of the single-arm bridge girder erection machine with the size of the single-line tunnel comprises:
the whole middle supporting leg 12 rotates by a first angle by taking the curved beam 16 of the single-arm bridge girder erection machine as an axis, and the value range of the first angle is between 0 and 75 degrees.
It should be noted that, theoretically, if the middle supporting leg 12 can rotate to a state parallel to the horn 14, the overall width of the single boom bridge crane can be reduced to the greatest extent, and the trafficability characteristic is the best, but because the horn 14 and the middle supporting leg 12 are both structures with a certain size, when the middle supporting leg 12 rotates to a certain angle, the supporting leg columns 121 on both sides thereof interfere with the horn 14, therefore, in this embodiment, the value range of the first angle is designed to be between 0 and 75 degrees, so that the requirement of the single line tunnel and the structural requirements of the horn 14 and the middle supporting leg 12 can be better considered, and in practical application, when the single boom bridge crane passes through the single line tunnel, the middle supporting leg 12 usually rotates to 72 degrees.
Optionally, the rotating the middle support leg 12 of the single-arm bridge girder erection machine to match the width of the single-arm bridge girder erection machine with the size of the single-line tunnel further comprises:
the leg column 121 of the middle leg 12 is rotated by a second angle with respect to the cross beam of the middle leg 12 with the vertical direction as an axis.
As shown in fig. 15, because the two sides of the middle leg column 121 of the middle leg 12 are provided with the auxiliary structures such as the operation room, the platform, the ladder and the like, the overall width of the middle leg 12 is increased to a certain extent, and in order to further improve the passability of the single-line tunnel through which the single-boom bridge crane passes, in this embodiment, the middle leg column 121 of the middle leg 12 is connected with the middle leg upper cross beam 122 and the middle leg lower cross beam 123 by using the rotating shaft, and when the single-boom bridge crane normally works, the middle leg column 121 is fastened with the middle leg upper cross beam 122 and the middle leg lower cross beam 123 by using the bolts.
When the single-arm bridge girder erection machine needs to pass through a single-line tunnel, the fastening bolts are opened, the middle supporting leg cylinders 121 on the left side and the right side are respectively rotated by a second angle, one side end faces, provided with auxiliary structures such as an operation chamber, a platform and a ladder stand, of the middle supporting leg cylinders 121 face forwards or backwards, after the middle supporting leg cylinders 121 are rotated in place, the middle supporting leg cylinders 121 and the middle supporting leg upper cross beam 122 and/or the middle supporting leg lower cross beam 123 can be temporarily fixed by bolts, and the phenomenon that the auxiliary structures collide with the inner wall of the single-line tunnel due to the fact that the supporting leg cylinders 121 rotate in the moving process of the single-arm bridge girder erection machine is prevented.
As shown in fig. 15, the vertical direction is the Z-axis direction, and the second angle can be selected according to the size of the first angle, so that the trafficability of the single-arm bridge erecting machine is not affected by the auxiliary structures such as the operation room, the platform, and the ladder on the middle support leg 12.
Although the present disclosure has been described above, the scope of the present disclosure is not limited thereto. Various changes and modifications may be made by those skilled in the art without departing from the spirit and scope of the disclosure, and these changes and modifications are intended to fall within the scope of the invention.
Claims (10)
1. A construction method for erecting a multi-beam box girder by using a single-boom bridge crane is characterized by comprising the following steps:
when the distance between the pier support pads is equal to the preset distance, the single-arm bridge girder erection machine completes via holes by adopting a four-leg via hole method;
a hoisting trolley (15) of the single-arm bridge girder erection machine hoists the box girder;
when the distance between the bridge piers and the support pads is smaller than the preset distance, detaching a front auxiliary supporting leg (10) of the single-arm bridge girder erection machine, lengthening a horn (14) of the single-arm bridge girder erection machine, and completing via holes by adopting a balanced via hole method;
a transition carrying pole (2) is arranged on a hanging beam carrying pole (151) of the crane trolley (15), and the crane trolley (15) hoists the box girder through the transition carrying pole (2);
the preset distance is the width of the front auxiliary supporting leg (10).
2. The construction method for erecting the multi-beam box girder by using the single-boom bridge crane according to claim 1, wherein the four-leg via method comprises the following steps:
after the single-arm bridge girder erection machine is installed in place or girder erection is completed, positioning pins between a front supporting leg (11) and a middle supporting leg (12) of the single-arm bridge girder erection machine and the machine arm (14) are removed, and through holes are prepared;
the front supporting leg (11) and the middle supporting leg (12) simultaneously drive the horn (14) to move forwards for a first distance, and the crane trolley (15) synchronously retreats to a position which is a second distance away from the tail end of the horn (14);
a rear supporting leg (13) for supporting the single-arm bridge girder erection machine, and the middle supporting leg (12) is retracted and moves forwards for a third distance to support the middle supporting leg (12);
the rear supporting leg (13) is retracted, the horn (14) is driven to move forwards for a fourth distance until the front auxiliary supporting leg (10) moves to the next pier position, and the front auxiliary supporting leg (10) is supported on a pier at the pier position;
supporting the rear supporting leg (13), and collecting the middle supporting leg (12) and moving forwards for a fifth distance to support the middle supporting leg (12);
and (2) the front supporting leg (11) is collected, the front supporting leg (11) automatically moves forwards for a sixth distance to the next pier position and then supports the front supporting leg (11) on the pier of the pier position, the front auxiliary supporting leg (10) is collected, the crane trolley (15) moves to the rear of the middle supporting leg (12) to prepare for erecting a beam, and the via hole is completed.
3. The construction method for erecting the multi-girder type box girder by using the single boom bridge crane according to claim 1, wherein the balanced type via method comprises:
after the single-arm bridge girder erection machine is installed in place or girder erection is completed, front supporting legs (11) and positioning pins between middle supporting legs (12) and the machine arms (14) of the single-arm bridge girder erection machine are removed, and through holes are prepared;
the front support leg (11) and the middle support leg (12) simultaneously drive the horn (14) to move forwards to the position above the pier of the next pier position, and the hoisting trolley (15) synchronously retracts to the position close to the rear support leg (13) of the single-arm bridge girder erection machine;
supporting the rear supporting leg (13), collecting the middle supporting leg (12), moving the middle supporting leg forward to a preset supporting position, and supporting the middle supporting leg (12);
and (3) the front supporting leg (11) is collected, the front supporting leg (11) automatically moves forwards to the next pier position and then supports the front supporting leg (11) on the pier at the pier position, and the via hole is completed.
4. The construction method for erecting the multi-beam box girder by using the single-boom bridge crane according to claim 1, wherein the distance between the hanging holes of the transition carrying pole (2) is matched with the distance between the hanging holes of the box girder.
5. The construction method for erecting the multi-beam box girder by using the single-boom bridge crane according to any one of claims 1 to 4, further comprising:
when the single-arm bridge girder erection machine passes through the single-line tunnel, the middle supporting leg (12) of the single-arm bridge girder erection machine is rotated until the width of the single-arm bridge girder erection machine is matched with the size of the single-line tunnel.
6. The construction method for erecting the multi-girder type box girder by using the single boom type bridge erecting machine according to claim 5, wherein the rotating the middle support leg (12) of the single boom type bridge erecting machine to match the width of the single boom type bridge erecting machine with the size of the single line tunnel comprises:
the whole middle supporting leg (12) rotates for a first angle by taking a curved beam (16) of the single-arm bridge girder erection machine as an axis.
7. The construction method for erecting the multi-beam box girder by using the single-boom bridge crane according to claim 6, wherein the first angle ranges from 0 to 75 degrees.
8. The construction method for erecting the multi-girder box girder by using the single-boom bridge girder erection machine according to claim 6, wherein the step of rotating the middle support leg (12) of the single-boom bridge girder erection machine to match the width of the single-boom bridge girder erection machine with the size of the single-line tunnel further comprises the steps of:
the middle supporting leg column (121) of the middle supporting leg (12) rotates a second angle relative to the cross beam of the middle supporting leg (12) by taking the vertical direction as an axis.
9. The construction method for erecting the multi-beam box girder by using the single-boom bridge erecting machine according to any one of claims 1 to 4, wherein the plate material of the single-boom bridge erecting machine is a high-strength steel plate.
10. The construction method for erecting the multi-beam box girder by using the single-boom bridge erecting machine according to any one of claims 1 to 4, wherein a reinforcing structure is arranged at the position, corresponding to the support pad of the box girder, of the bottom of the middle supporting leg (12) of the single-boom bridge erecting machine.
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