CN111717797A - Double-machine cooperative hoisting system and method for overpass railway deep cutting highway bridge under construction - Google Patents
Double-machine cooperative hoisting system and method for overpass railway deep cutting highway bridge under construction Download PDFInfo
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- CN111717797A CN111717797A CN202010611753.1A CN202010611753A CN111717797A CN 111717797 A CN111717797 A CN 111717797A CN 202010611753 A CN202010611753 A CN 202010611753A CN 111717797 A CN111717797 A CN 111717797A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B66—HOISTING; LIFTING; HAULING
- B66C—CRANES; LOAD-ENGAGING ELEMENTS OR DEVICES FOR CRANES, CAPSTANS, WINCHES, OR TACKLES
- B66C13/00—Other constructional features or details
- B66C13/04—Auxiliary devices for controlling movements of suspended loads, or preventing cable slack
- B66C13/08—Auxiliary devices for controlling movements of suspended loads, or preventing cable slack for depositing loads in desired attitudes or positions
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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
- B66C23/00—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes
- B66C23/18—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes specially adapted for use in particular purposes
- B66C23/36—Cranes comprising essentially a beam, boom, or triangular structure acting as a cantilever and mounted for translatory of swinging movements in vertical or horizontal planes or a combination of such movements, e.g. jib-cranes, derricks, tower cranes specially adapted for use in particular purposes mounted on road or rail vehicles; Manually-movable jib-cranes for use in workshops; Floating cranes
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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
Abstract
The invention relates to a double-crane cooperative hoisting system and a double-crane cooperative hoisting method for an overpass railway deep cut highway bridge, wherein a crane A (2) and a crane B (3) at a hoisting area of a bridge site are provided with a preset beam field beside the bridge site, and a gun truck for conveying a beam piece (1) to the hoisting area is arranged between the beam field and the bridge site; presetting a lifting point A (9) corresponding to the crane A (2) and a lifting point B (10) corresponding to the crane B (3) at two ends of the beam (1); a middle span (5) is preset in the middle of the pier (4), side spans (6) are arranged at two ends of the middle span (5), a moat is set as an upper station (8) of the bridge at the side span (6), and a side slope platform is set as a conversion station (7) midway when a beam body (1) of the side span (6) is installed; the invention has reasonable design, compact structure and convenient use.
Description
Technical Field
The invention relates to a double-machine cooperative hoisting system and method for an overpass railway deep cutting highway bridge under construction.
Background
A common implementation method is to interrupt the existing road and build an upper cross-railway cutting highway bridge to recover the existing road engineering after the railway cutting main body engineering is finished. The hoisting of the railway deep cutting highway bridge striding over the building is difficult and high in safety risk due to the fact that a crane walking area is small, the operation space of a hoisting arm is limited, and requirements for hoisting distance and height are high. At present, relevant researches are not reported. Some scholars research the hoisting technology of the bridge over the existing railway and highway. The maxumei researches the hoisting construction parameters, the crane load rate under each working condition and the construction quality control measures of the steel bent cap of the high-speed railway crossing the Jinghush; the sequence and the operation flow of single-machine hoisting and double-machine hoisting of the viaduct on the upper-span railway business line are respectively researched by combining the Koran jade with engineering examples; the Michelia royal is used for researching crane type selection and hoisting sequence of the overline elevated box girder bridge under the complex hoisting condition aiming at the characteristics of complex traffic, limited construction range and the like of the construction area of the overline elevated box girder bridge.
Disclosure of Invention
The invention aims to solve the technical problem of providing a double-machine cooperative hoisting system and method for a railway-crossing deep cutting highway bridge. The invention provides a double-machine cooperation step-by-step lifting method and a double-machine cooperation one-time in-place hoisting method, which are respectively used for hoisting an edge span and a middle span beam which are spanned on a deep cutting highway bridge of a built railway. Through setting up the roof beam body and changing: the hoisting point switching station is changed by changing a hook in the air and transferring and changing a crane station: and a series of operation links such as lifting point conversion and the like realize the long-distance and large-height lifting and hoisting of the side span box girder. The main construction parameters are researched, and the hoisting safety of the crane is analyzed.
In order to solve the problems, the technical scheme adopted by the invention is as follows:
a dual-machine cooperative hoisting method for an overpass deep cutting road bridge under construction is provided, which is based on a dual-machine cooperative hoisting system for the overpass deep cutting road bridge under construction; the method comprises the following steps;
step one, executing a side span box girder hoisting scheme;
firstly, a crane A and a crane B are both positioned on a roadbed, and station positions are determined according to operation conditions and crane performance parameters; then, mounting the lifting auxiliary device on the beam; secondly, the crane A and the crane B respectively hook a lifting point A and a lifting point B of the beam body, wherein a steel wire rope of the crane B is connected with a movable lifting lug seat positioned at the lifting point B, trial lifting is carried out, after safety and stability are confirmed, lifting is started, an included angle between a monitoring side vertical frame and a monitoring swinging rod is observed, observation of the beam body (1) is realized, and whether the beam body is lifted correctly or not is determined;
firstly, lifting a beam piece by a crane A and a crane B, and then performing rotation action to the direction along the bridge; then, the double machines cooperatively operate to lift the beam piece to a conversion station, and one end of the beam piece is stably placed at a temporary supporting point arranged on the cutting slope platform; secondly, the movable lifting lug seat moves to a lifting point A and is blocked by a transverse blocking rod at the end A of the lifting lug, so that the crane B is hooked and hung at the lifting point A;
firstly, transferring a crane A to a moat hoisting station; then, the auxiliary rotating shaft drives the auxiliary swing arm to swing upwards, and meanwhile, the end part of the auxiliary hanging rope is conveyed to a cutting hoisting station by using inertia force; secondly, the crane A hooks the auxiliary hanging rope, and the beam is dropped to complete the hoisting after reaching the side span position.
A dual-machine cooperative hoisting system for an overpass railway deep cutting highway bridge under construction comprises a crane A, a crane B and a hoisting auxiliary device, wherein the hoisting auxiliary device is used for being installed on a beam; and the hoisting auxiliary device is provided with a hoisting point A and a hoisting point B at two ends.
As a further improvement of the above technical solution:
the handling auxiliary device includes:
the supporting device is used for being sleeved on the beam piece;
the balance monitoring device is used for monitoring whether the beam is horizontal or not in the hoisting process;
the process base is used for supporting the beam piece so as to facilitate installation;
and the movable lifting lug device is used for changing the position of the lifted suspension.
The supporting device comprises two side supporting frames and a middle supporting frame between the two side supporting frames; the two side supporting frames and the middle supporting frame are connected into a whole through a side connecting rod; side central openings corresponding to the beam pieces are arranged on the side supporting frames and the middle supporting frame; side central openings of the side support frames are provided with side stop blocks for placing the beam pieces to longitudinally slide out through bolts, and side fixing hanging rings are arranged on the two side support frames and the middle support frame;
the balance monitoring device comprises a monitoring lifting guide frame vertically arranged on the supporting device; a monitoring articulated shaft is arranged in the monitoring elevating guide frame in an elevating way, a monitoring lower pressure head used for pressing the upper surface of the beam piece is arranged at the lower end of the monitoring articulated shaft, a monitoring side vertical frame is vertically arranged at one side of the monitoring lower pressure head, a monitoring horizontal vertical cross rod is vertically arranged on the monitoring side vertical frame, and a monitoring swing rod is arranged at the lower end of the monitoring horizontal vertical cross rod in a swinging way; a vertical marking line is arranged on the monitoring side vertical frame, and whether the beam is horizontal or not is judged by observing the swing of the monitoring swing rod relative to the vertical marking line;
the movable lifting lug device comprises a lifting lug longitudinal moving frame which is longitudinally arranged on the supporting device; the lifting point A and the lifting point B are arranged at two ends of the lifting lug longitudinal moving frame; the lifting lug longitudinal moving frame is driven by a push rod to move longitudinally and is provided with a moving lifting lug seat;
a lifting lug B end limiting block is arranged at the lifting point B, and a lifting lug B end transverse stop rod for stopping the movement of the movable lifting lug seat is arranged at the output end of the lifting lug B end limiting block;
the hoisting point A and the hoisting point B have the same structure; and a lifting lug A end transverse blocking rod for blocking the movable lifting lug seat from moving is arranged at the output end of the lifting point A.
The auxiliary lifting device comprises an auxiliary support arranged on the supporting device, an auxiliary rotating shaft driven by a motor in a transmission mode is arranged on the auxiliary support, an auxiliary swinging arm driven to swing by the auxiliary rotating shaft is connected with an auxiliary hanging rope in a swinging mode below the auxiliary swinging arm.
The invention has the advantages of reasonable design, low cost, firmness, durability, safety, reliability, simple operation, time and labor saving, capital saving, compact structure and convenient use.
Drawings
FIG. 1 is a schematic view of the construction of the present invention.
Fig. 2 is a schematic structural diagram of the present invention.
FIG. 3 is a schematic view of the construction of the side span of the present invention 1.
FIG. 4 is a schematic view of the construction of the side span of the present invention 2.
FIG. 5 is a schematic view of the construction of the side span of the present invention, FIG. 3.
FIG. 6 is a schematic view of the construction of the side span of the present invention 4.
Fig. 7 is a schematic mid-span construction of the present invention.
Figure 8 is a schematic view of the hoist of the present invention.
Fig. 9 is a schematic view of the hoisting structure of the invention.
Fig. 10 is a schematic view of the crane structure of the present invention.
Fig. 11 is a schematic view of the auxiliary structure of the present invention.
Fig. 12 is a partial schematic view of the auxiliary structure of the present invention 1.
Fig. 13 is a partial schematic view of the auxiliary structure of the present invention 2.
Fig. 14 is a partial schematic view of the auxiliary structure of the present invention, fig. 3.
FIG. 15 is a schematic view of the construction of the present invention 1.
FIG. 16 is a schematic view of the construction of the present invention 2.
Wherein: 1. a beam member; 2. a crane A; 3. a crane B; 4. a bridge pier; 5. intermediate span; 6. side crossing; 7. converting stations; 8. a bridge upper station; 9. a, hoisting points; 10. b, hoisting points; 11. a hoisting auxiliary device; 12. a support device; 13. a balance monitoring device; 14. a process base; 15. moving the lifting lug device; 16. an auxiliary lifting device; 17. a side support frame; 18. a side connecting rod; 19. a side central opening; 20. a side stop block; 21. laterally fixing a hanging ring; 22. a middle support frame; 23. monitoring the lifting guide frame; 24. monitoring the articulated shaft; 25. monitoring the lower pressure head; 26. monitoring a side vertical frame; 27. monitoring a horizontal vertical cross bar; 28. monitoring the sway bar; 29. the lifting lug longitudinally moves the frame; 30. a limiting block at the end B of the lifting lug; 31. moving the lug seat; 32. a transverse stop lever at the end B of the lifting lug; 33. a transverse stop lever at the end A of the lifting lug; 34. an auxiliary support; 35. an auxiliary rotating shaft; 36. an auxiliary swing arm; 37. and (5) auxiliary hanging ropes.
Detailed Description
1-16, in the example, the XX city XX district XX village side existing road intersects with the XX railway at DK169+ 475. The bridge site profile is shown in figure 1. The overpass highway bridge is a simply-supported continuous prestressed reinforced concrete box girder bridge, the bridge span is arranged to be 3 multiplied by 20m, and the included angle between the axis of the bridge and the right front of the railway is 120 degrees. The bridge width is 7m, two box girders are transversely arranged at each span, the girder width is 3.1m, and the pier height is 12 m. A highway bridge layout is shown in figure 2. A beam yard is arranged on the left side of a railway DK169+600 line and is transported to a bridge site through a beam transportation access road for erection.
The technical problem exists that (1) the hoisting distance and the height are high. The local bridge is located in a deep cutting, the side slope is 14m high, and the transverse distance from a slope toe to the abutment support is 16 m. Therefore, the hoisting maximum distance and height reach 25.0m and 20.6m respectively. (2) The running area of the crane is small. The width of a roadbed at the bridge site is only 10m, the two piers are arranged in the range of a roadbed surface, and the highway bridge and the railway form a small included angle, so that the area for running of the crane is narrow. (3) The collision risk is high in the crane operation process. Because the crane operates in the deep cutting, and the pier exists in the operating range, and the double-crane hoisting process needs to be operated in coordination such as beam body turning, overhead hook changing, station changing and the like, the risk of collision among the suspension arm, the pier, the beam and the suspension arm of the crane is high. Common simply supported box girder erection methods include a bridge girder erection machine method, a cast-in-place method and a hoisting method. The bridge girder erection machine method is suitable for erecting box girders with more spans. The engineering has fewer spans, only has three spans and is inconvenient for hoisting on-site traffic, and if a bridge girder erection machine is adopted for construction, construction roads and splicing platforms need to be built; in addition, the assembly and disassembly of the bridge girder erection machine need the cooperation of a large-tonnage crane, more specialized personnel are equipped, and the engineering cost is higher. The cast-in-place construction method has large field operation amount, has cross operation with slope protection and drainage engineering, also influences the development of subsequent procedures and is difficult to ensure the construction period. The crane hoisting method has small field operation amount and small influence on the construction of railway engineering under construction; by parallel operation, the highway can be opened as early as possible, and the influence on local traffic is small. Therefore, the project adopts a crane hoisting scheme, and the hoisting equipment adopts an all-ground truck crane.
The specific scheme content is as follows:
hoisting sequence:
because the limit is hoisted by the restriction of cutting side slope, the hoist and mount degree of difficulty is big, for avoiding the influence of midspan, adopt the hoist and mount order of earlier limit span midspan on the whole, hoist one end limit and stride case roof beam earlier promptly, hoist other end limit and stride case roof beam again, hoist the midspan case roof beam afterwards. And for each span, hoisting the spans in sequence from one side.
Step one, executing a side span box girder hoisting scheme;
the difficulty of hoisting the side span box girder lies in that the transverse distance from the slope toe to the bridge abutment is 16m and the vertical height is 14m, if the side span box girder is hoisted in place at one time, the operation radius of the crane at least reaches 25m, meanwhile, the requirement of hoisting weight is met, the requirement on the technical performance of the crane is high, and the safety risk is large.
Therefore, in order to guarantee the hoisting safety and reduce the construction cost, a double-crane cooperative step hoisting method is provided, namely, the box girder is hoisted by using two cranes on the roadbed firstly when the gun truck transports the girder to the hoisting area, and the side slope platform is used as a conversion station to be changed: hoisting point conversion; then one of the cranes is transferred to the cutting, and the cutting crane and the roadbed crane are in place in cooperation with the hoisting beam.
Step two, executing a mid-span box girder hoisting scheme;
the midspan box girder adopts a double-crane cooperation one-time in-place hoisting method, namely, a gun truck transports the girder to a hoisting area, and after two cranes take place on a railway roadbed, the double cranes lift and lift the box girder to one-time in-place and fall the girder to complete hoisting.
Concrete hoisting process flow
In the step one, the side span box girder hoisting process flow
And the side span box girder is hoisted by adopting a double-machine cooperative step-by-step hoisting method. The process principle is as follows: transporting the box girder to a hoisting area by a girder transporting gun carriage, wherein two cranes A, B are both positioned on the roadbed, and the station position is determined according to the operation condition and the crane performance parameters; the crane A, B respectively hooks the left end and the right end of the box girder, test hoisting is carried out, and hoisting is started after safety and stability are confirmed; the double machines lift the box girder and then perform a turning action to the direction along the bridge, the double machines cooperatively operate to lift the box girder to the height of the slope platform, and one end of the box girder is stably arranged at a temporary supporting point arranged on the cutting slope platform; the crane B is unhooked and hooked at the left end of the beam; the crane A unhooks and collects the vehicle, transfers the vehicle to a cutting hoisting station and hooks the vehicle at the right end of the beam; and the double machines are cooperated to lift the box girder again, and the girder is dropped to finish lifting after the box girder reaches the installation position. The process flow of the hoisting construction is shown in fig. 15. The hoisting process is shown in fig. 16.
In the second step, the mid-span box girder hoisting process flow
And the midspan box girder is hoisted by adopting a double-machine cooperation one-time in-place hoisting method. The process principle is as follows: transporting the box girder to a hoisting area by a girder transporting gun carriage, wherein two cranes A, B are both positioned on the roadbed, and the station position is determined according to the operation condition and the crane performance parameters; the crane A, B respectively hooks the left end and the right end of the box girder, test hoisting is carried out, and hoisting is started after safety and stability are confirmed; and the double machines lift the box girder and then perform a rotation action to the direction along the bridge, and the double machines cooperatively operate to lift the box girder to the mounting position, and fall the girder to finish the hoisting. The process flow of the hoisting construction is shown in fig. 15. The hoisting process is shown in fig. 16.
Study of major construction parameters
The preset box girder belongs to a simple support member, and in order to ensure that the stress point and the stress state of the box girder in the hoisting process are consistent with those of the box girder in use, the parallel hoisting two-point crane is adopted to ensure that the box girder is changed in the hoisting process: balanced stress at the lifting point and stability of the lifting beam and the falling beam.
Changing: the distance between the hoisting point and the two ends of the object is calculated by taking the moment balance of the box girder as a calculation standard, namely, the improvement is ensured: the positive and negative bending moments at the hoisting point are equal. Therefore, two changes: the lifting points are respectively arranged at the positions 0.2L away from the beam ends. As shown in fig. 15. Changing: the hoisting point adopts a steel wire rope binding pocket hoisting type, the weight of each box girder in the project is 62.0t, and two changes are carried out under the condition of double-machine hoisting: the theoretical bearing capacity of the lifting point is 31.0 t.
The purpose of crane model selection is to determine the specific model of the crane according to the hoisting task, so that the parameters of the crane, such as the operation radius, the hoisting height, the hoisting weight and the like, meet the requirements of operation working conditions. The engineering adopts double-crane hoisting, the cranes should select the same model as much as possible, and if the models of the two cranes are different, the similar working speed should be selected as much as possible, so that the cooperative operation is facilitated.
First, the calculated load G of the suspended object is determinedj
Gj＝K1×K2×G0(1)
In the formula, G0Taking the weight of the hoisted object and the sum (t) of the weight of the lifting lug and the weight of the rigging as 33.0 t; k1Taking the dynamic load coefficient as 1.1; k2Taking 1.2 as the imbalance coefficient of double-crane lifting, and calculating to obtain Gj＝43.6t。
Then, according to the parameter performance table of the crane, selecting the rated hoisting capacity Q to be more than or equal to Gj. On the premise of meeting the lifting weight, the length L and the working radius R of the suspension arm are selected according to the lifting height H and the field condition. According to the hoisting process, the operation radius and the hoisting height of each crane are calculated according to different working conditions, performance tables of cranes with different tonnages are consulted for comparative analysis, economic factors are considered on the premise that the hoisting weight requirement is met, the crane A is a QAY200 type crane, and the crane B is a QAY300 type crane.
Steel wire rope type selection
The steel wire rope type selection needs to meet relevant requirements of the literature at the same time. The use standard of the large-diameter steel wire rope is
In the formula, Dmin is the minimum diameter (mm) which is required to be met by the hoisting steel wire rope; q is the crane sling bearing weight (t); beta is the load distribution coefficient, and is generally 66%. Considering the imbalance coefficient K of the double-crane lifting, 1.2 is generally adopted, so that the bearing weight Q of each crane sling under the working condition of the double-crane lifting is 31.0 × 1.2 and 37.2 t. The Dmin is 37.0mm as calculated by formula (2).
The force FN of the single-side single-strand steel wire rope is calculated according to the following formula
In the formula: the included angle coefficient is 1.05, the bearing weight (t) of the crane sling is Q, and 37.2t is taken. FN is calculated to be 9.8 t.
Sum of tensile forces Zn＝k·FN(4)
And in the formula, k is the safety coefficient of hoisting the steel wire rope, and 8 is taken. Calculated Zn 768.3 kNZ. The steel wire rope is made of a fiber core, so the breaking force needs to be converted into a formula,
wherein, alpha is a conversion coefficient and is 1.226, and the obtained breaking tension of the steel wire rope is Z which is 626.7 kN; breaking force
Wherein Z is breaking tension (kN); FC is tensile strength of the steel cord, 1670kg/mm2 is taken, and D is calculated to be 36.0 mm.
Through the analysis and calculation, the steel wire rope is selected from phi 37-6 multiplied by 37zs + FC-1670.
4.4 supporting leg foundation bearing capacity
According to the hoisting scheme, the crane A, B has equal load bearing capacity. The total bearing weight N of a single crane foundation is calculated according to the following formula
In the formula, gamma G and gamma Q are respectively static load and dynamic load combination coefficients, and are respectively 1.2 and 1.4; g0 is the sum (kN) of the weight of the crane, the super-lift counterweight, the sling and the rigging, G0 equals 1360kN for crane a, and G0 equals 1520kN for crane B. Calculating according to the latter; GL is the box beam weight of 303.8 kN. The total weight N is 2322 kN.
Assuming that four supporting legs of the crane are uniformly stressed, the average compressive stress applied to the foundation by each supporting leg is
Wherein A is the area of a steel base plate of the crane support leg, and the steel plate of the support leg is 2.5m multiplied by 3.0m multiplied by 0.05 m. Calculated, p is 77.4 kPa.
Considering the construction of the upper-span railway girder erection and taking 1.2 times of safety coefficient, the bearing capacity requirement of the foundation is faNot less than 1.2P 92.9 kPa. If the bearing capacity of the foundation on site does not meet the requirements, treatment measures such as tamping or replacing and the like can be adopted.
5 lifting safety analysis
In order to ensure the stability of the crane in the hoisting process, the anti-overturning stability of the crane needs to be analyzed. According to the document [9], the crane anti-overturning stability standard is
∑M＝KG·MG+KQ·MQ+KW·MW≥0 (9)
In the formula, ∑MFor resisting overturning moment, KGTaking 1 as a dead weight weighting coefficient; kQTaking 1.15 as a weighting coefficient of lifting load; kWTaking 1 as a wind load weighting coefficient; mG、MQ、MWThe dead weight of the crane, the lifting load and the moment of the wind load to the overturning edge are respectively. The stress diagram of the crane operation is shown in the figure.
In the figure 8, G-crane dead weight (kN);
q-hoist weight (kN);
w-wind dynamic load (kN) which is 20 percent of the weight of the hoisted object
Consider that
a is the distance (m) from the gravity center of the crane to the overturning fulcrum of the support leg;
r is the crane operation radius (m);
h is the height (m) of the wind power loading resultant force point.
The QAY300 type crane G is 179t, a is 5.85m, R is 25m, Q is 33t, W is 6.6t, and the pneumatic loading force point is taken
The center of gravity of the suspended object, h is 16.3m, and can be calculated
∑M212.8kNm & gt 0, meets the requirement.
In the same way, for the QAY200 type crane,
∑M＝449.4kNm＞0，meets the requirements.
The method has the effects that (1) the box girder of the deep cutting highway bridge of the railway under construction is hoisted by adopting a crane hoisting scheme. (2) The problem of long-distance and large-height lifting of the side span box girder of the deep cutting highway bridge striding over the built railway can be solved by adopting a double-machine cooperation step-by-step lifting method. (3) A QAY200 type crane and a QAY300 type crane are selected, and a phi 37-6 multiplied by 37zs + FC-1670 steel wire rope can meet the requirement of hoisting capacity. The bearing capacity of the foundation needs to reach 92.9 kPa. (4) The anti-overturning stability of the crane meets the requirement, and the construction safety can be ensured. (5) Practice proves that the double-machine cooperative hoisting technical method for the box girder of the deep cutting highway bridge of the overpass railway under construction is novel, practical, safe, reliable and good in application effect.
As shown in fig. 1, the dual-crane cooperative hoisting system for the railway deep cut highway bridge spanned over the building of the embodiment comprises a crane a2, a crane B3 and a hoisting auxiliary device 11 for being mounted on a beam 1; the lifting auxiliary device 11 is provided with a lifting point A9 and a lifting point B10 at two ends.
The hoist auxiliary device 11 includes:
the supporting device 12 is used for being sleeved on the beam member 1;
the balance monitoring device 13 is used for monitoring whether the beam 1 is horizontal or not in the hoisting process;
a process base 14 for supporting the beam member 1 to facilitate installation;
the lifting lug device 15 is moved for changing the position of the suspended load to be lifted.
A support device 12 comprising two side support frames 17 and a middle support frame 22 between the two side support frames 17; the two side supporting frames 17 and the middle supporting frame 22 are connected into a whole through the side connecting rod 18; side central openings 19 corresponding to the beam 1 are arranged on the side supporting frames 17 and the middle supporting frame 22; a side central notch 19 of the side support frames 17 is provided with a side stop block 20 for placing the beam piece 1 to slide out longitudinally through a bolt, and side fixing hanging rings 21 are respectively arranged on the two side support frames 17 and the middle support frame 22;
the balance monitoring device 13 comprises a monitoring lifting guide frame 23 vertically arranged on the supporting device 12; a monitoring articulated shaft 24 is arranged in the monitoring elevating guide frame 23 in an elevating way, a monitoring lower pressure head 25 used for pressing the upper surface of the beam 1 is arranged at the lower end of the monitoring articulated shaft 24, a monitoring side vertical frame 26 is vertically arranged at one side of the monitoring lower pressure head 25, a monitoring horizontal vertical cross rod 27 is vertically arranged on the monitoring side vertical frame 26, and a monitoring swinging rod 28 is arranged at the lower end of the monitoring horizontal vertical cross rod 27 in a swinging way; a vertical marking line is arranged on the monitoring side vertical frame 26, and whether the beam 1 is horizontal or not is judged by observing the swing of the monitoring swing rod 28 relative to the vertical marking line;
the movable lifting lug device 15 comprises a lifting lug longitudinal moving frame 29 which is longitudinally arranged on the supporting device 12; the lifting point A9 and the lifting point B10 are arranged at two ends of the lifting lug longitudinal moving frame 29; a movable lug seat 31 is driven by a push rod to move longitudinally on the lug longitudinal moving frame 29;
a lifting lug B end limiting block 30 is arranged at the lifting point B10, and a lifting lug B end transverse stop rod 32 for stopping the movement of the movable lifting lug seat 31 is arranged at the output end of the lifting lug B end limiting block 30;
the lifting point A9 and the lifting point B10 have the same structure; the output end of the lifting point A9 is provided with a transverse stopping rod 33 at the end A of the lifting lug for stopping the movement of the movable lifting lug seat 31.
The auxiliary lifting device 16 comprises an auxiliary support 34 arranged on the supporting device 12, an auxiliary rotating shaft 35 driven by a motor in a transmission way is arranged on the auxiliary support 34, an auxiliary swing arm 36 driven by the auxiliary rotating shaft 35 to swing, and an auxiliary hanging rope 37 is connected below the auxiliary swing arm 36 in a swinging way.
The dual-machine cooperative hoisting method for the overpass deep cutting road bridge of the embodiment is based on a dual-machine cooperative hoisting system for the overpass deep cutting road bridge of the subway under construction; the method comprises the following steps;
step one, executing a side span box girder hoisting scheme;
firstly, a crane A2 and a crane B3 are both positioned on a roadbed, and station positions are determined according to operation conditions and crane performance parameters; then, the hoisting auxiliary device 11 is installed on the beam 1; secondly, the crane A2 and the crane B3 respectively hook the lifting point A9 and the lifting point B10 of the beam body 1, wherein the steel wire rope of the crane B3 is connected with the movable lifting lug seat 31 positioned at the lifting point B10, test lifting is carried out, after safety and stability are confirmed, lifting is started, the included angle between the monitoring side vertical frame 26 and the monitoring swinging rod 28 is observed, observation of the beam body 1 is realized, and whether the beam body is lifted rightly or not is determined.
Firstly, lifting the beam piece 1 by a crane A2 and a crane B3, and then performing rotation to the direction along the bridge; then, the double machines cooperatively operate to lift the beam piece 1 to a conversion station 7, and one end of the beam piece 1 is stably placed at a temporary supporting point arranged on the cutting slope platform; secondly, the movable lifting lug seat 31 moves to the lifting point A9 and is blocked by a transverse blocking rod 33 at the end A of the lifting lug to realize that the crane B3 is hooked at the lifting point A9;
firstly, transferring a crane A2 to a graben hoisting station; then, the auxiliary rotating shaft 35 drives the auxiliary swing arm 36 to swing upwards, and meanwhile, the end part of the auxiliary hanging rope 37 is conveyed to a cutting hoisting station by using inertia force; then, the crane a2 hooks the auxiliary suspending rope 37, and after the beam 1 reaches the side span 6 position, the beam falls to complete the suspension.
The invention realizes the construction of a beam piece 1 based on a crane A2 and a crane B3, skillfully realizes the automatic change of a hoisting point, realizes the installation of a middle span 5 and a side span 6, realizes the middle buffer alignment position through the ingenious design of a conversion station 7, realizes the pulling in place of a station 8 on a bridge, realizes the hoisting of an A hoisting point 9 and a B hoisting point 10, realizes the support of a beam body by taking a hoisting auxiliary device 11 as an invention point, avoids the sinking and deformation of the beam body caused by the traditional hoisting, thereby having good universality and adjustable length through a support device 12 frame, neatening and stressing, avoiding the deformation, utilizing the swinging of a balance monitoring device 13, realizing the visual observation of an included angle by naked eyes, conveniently supporting off the process base 14 and conveniently assembling, moving the device 15 to realize the position adjustment of a hoisting wire rope, assisting the hoisting device 16 to realize the automatic swinging, avoiding the manual hook replacement, it can be circuit control or battery control, and monitoring lift leading truck 23 realizes the direction, and monitoring articulated shaft 24 has fine compatibility to make pressure head 25 press on the roof beam body upper surface under the monitoring, thereby realized the perpendicular of monitoring side vertical frame 26, utilize monitoring swinging arms 28 (vertical state all the time) of wobbling on the horizontal vertical horizontal pole 27 of monitoring to realize perpendicular and vertical contained angle and adjust.
Claims (7)
1. A dual-machine cooperative hoisting method for an overpass railway deep cutting highway bridge under construction is characterized by comprising the following steps: the method is characterized in that a preset beam field is arranged beside a bridge site by means of a crane A (2) and a crane B (3) at a bridge site hoisting area, and a gun carrier for conveying a beam piece (1) to the hoisting area is arranged between the beam field and the bridge site; a hoisting point (9) corresponding to the crane A (2) and a B hoisting point (10) corresponding to the crane B (3) are preset at the two ends of the beam (1); a middle span (5) is preset in the middle of the pier (4), side spans (6) are arranged at two ends of the middle span (5), a moat is set as an upper station (8) of the bridge at the side span (6), and a side slope platform is set as a conversion station midway when a beam body (1) of the side span (6) is installed;
the method comprises the following steps;
step one, executing a side span box girder hoisting scheme;
firstly, a crane A (2) and a crane B (3) are both positioned on a roadbed, and station positions are determined according to operation conditions and crane performance parameters; then, the crane A (2) and the crane B (3) respectively hook the lifting point A (9) and the lifting point B (10) of the beam body (1) for trial lifting, and after safety and stability are confirmed, the lifting is started;
firstly, lifting the beam piece (1) by the crane A (2) and the crane B (3) and then performing rotation to the direction along the bridge; then, the double machines cooperatively operate to lift the beam piece (1) to a conversion station (7), and one end of the beam piece (1) is stably placed at a temporary supporting point arranged on the cutting slope platform; secondly, hoist B (3) unhook and hook hang in A hoisting point (9) to the side slope platform is as the conversion station, changes: hoisting point conversion;
step three, firstly, a crane A (2) unhooks and collects a vehicle, transfers the vehicle to a graben hoisting station, and hooks and hangs the vehicle at a hanging point B (10) of a beam; then, the double machines cooperate to lift the box girder again, and the girder falls to the position of the side span (6) of the installation side to complete hoisting;
step two, executing a mid-span box girder hoisting scheme; the beam piece (1) of the midspan box beam adopts a hoisting method that the two cranes A (2) and B (3) cooperate to be in place once, namely, the two cranes carry out double-crane hoisting after being in place on the railway roadbed to hoist the box beam in place once and drop the beam to finish hoisting.
2. The double-machine cooperative hoisting method for the railway deep cutting highway bridge spanned over the under-construction according to claim 1, wherein: before the first step, the method also comprises a crane model selection step;
first, the calculated load G of the suspended object is determinedj，Gj＝K1×K2×G0(1)
In the formula, G0The sum of the weight of the hoisted object, the weight of the lifting lug and the weight of the rigging; k1Is a dynamic load coefficient, K2The coefficient is the unbalance coefficient of double-crane lifting;
then, according to the parameter performance of the crane, selecting the rated lifting capacity Q to be more than or equal to Gj(ii) a On the premise of meeting the lifting weight, selecting the length L and the working radius R of the suspension arm according to the lifting height H and the field condition; calculating the operation radius and the lifting height of each crane according to different working conditions according to a lifting process, and selecting the type of the crane by considering economic factors on the premise of meeting the lifting weight requirement;
before the first step, a steel wire rope type selection step is further included;
firstly, the steel wire rope is selected to have the use standard of,
in the formula, DminThe minimum diameter of the hoisting steel wire rope is required to be met, Q is the bearing weight of the crane sling, β is a load distribution coefficient, and 1.2 is taken in consideration of the unbalanced coefficient K of the double-crane hoisting;
then, the stress FN of the single-strand steel wire rope on the single side is calculated according to the following formula,
second, the sum of the tensile forces Zn＝k·FN(4)；
In the formula, k is the safety coefficient of a hoisting steel wire rope;
thirdly, because the steel wire rope is made of the fiber core, the breaking force needs to be converted into a formula,
in the formula, alpha is a conversion coefficient and takes 1.226;
then, breaking the tension
Wherein Z is breaking tension (kN); fCThe tensile strength of the steel wire rope;
selecting the steel wire rope through the analysis and calculation;
in addition, after the crane is selected, a step of checking the bearing capacity of the landing leg foundation is executed;
firstly, the hoisting scheme shows that the hoisting weight of the crane) is equal; the total bearing weight N of a single crane foundation is calculated as follows,
in the formula, gammaG、γQRespectively is static load and dynamic load combination coefficient; g0The sum of the weight of the crane dead weight, the super-lifting counterweight, the sling and the rigging, GLIs the weight of the box girder;
then, assuming that the four legs of the crane are uniformly stressed, the average compressive stress applied to the foundation by each leg is
In the formula, A is the area of a steel base plate of a crane support leg;
considering the construction of the upper-span railway girder erection and taking 1.2 times of safety coefficient, the bearing capacity requirement of the foundation is faNot less than 1.2P 92.9 kPa; if the bearing capacity of the site foundation does not meet the requirements, tamping or filling-replacing treatment measures can be adopted;
in addition, after the crane is selected, a step of checking the bearing capacity of the landing leg foundation is executed;
firstly, the crane anti-overturning stability standard is selected as
∑M＝KG·MG+KQ·MQ+KW·MW≥0 (9)
Wherein ∑ M is the anti-overturning moment, KGIs a dead weight weighting coefficient; kQWeighting the load for lifting; kWIs a wind load weighting coefficient; mG、MQ、MWThe dead weight of the crane, the lifting load and the moment of the wind load to the overturning edge are respectively.
3. The utility model provides an upper-span railway under construction dark cutting highway bridge duplex is hoist and mount system in coordination which characterized in that: comprises a crane A (2), a crane B (3) and a hoisting auxiliary device (11) which is used for being installed on a beam piece (1); a hoisting point (9) and a hoisting point (10) B are arranged at two ends of the hoisting auxiliary device (11).
4. The double-machine cooperative hoisting system and method for the railway deep cutting road bridge spanned over the under-construction railway according to claim 3, are characterized in that: the hoisting auxiliary device (11) comprises:
the supporting device (12) is used for being sleeved on the beam piece (1);
the balance monitoring device (13) is used for monitoring whether the beam (1) is horizontal or not in the hoisting process;
the process base (14) is used for supporting the beam piece (1) so as to facilitate installation;
and a moving lifting lug device (15) for changing the position of the suspended object to be lifted.
5. The dual-machine cooperative hoisting system for the railway deep cut highway bridge spanned over the under-construction according to claim 4, wherein:
the supporting device (12) comprises two side supporting frames (17) and a middle supporting frame (22) between the two side supporting frames (17); the two side supporting frames (17) and the middle supporting frame (22) are connected into a whole through a side connecting rod (18); side central openings (19) corresponding to the beam piece (1) are arranged on the side supporting frames (17) and the middle supporting frame (22); side central openings (19) of the side support frames (17) are provided with side stop blocks (20) for placing the beam piece (1) to slide out longitudinally through bolts, and side fixed hanging rings (21) are arranged on the two side support frames (17) and the middle support frame (22);
the balance monitoring device (13) comprises a monitoring lifting guide frame (23) vertically arranged on the supporting device (12); a monitoring articulated shaft (24) is arranged in the monitoring elevating guide frame (23) in an elevating way, a monitoring lower pressure head (25) used for pressing the upper surface of the beam (1) is arranged at the lower end of the monitoring articulated shaft (24), a monitoring side vertical frame (26) is vertically arranged at one side of the monitoring lower pressure head (25), a monitoring horizontal vertical cross rod (27) is vertically arranged on the monitoring side vertical frame (26), and a monitoring swinging rod (28) is arranged at the lower end of the monitoring horizontal vertical cross rod (27) in a swinging way; a vertical marking line is arranged on the monitoring side vertical frame (26), and whether the beam (1) is horizontal or not is judged by observing the swing of the monitoring swing rod (28) relative to the vertical marking line;
the movable lifting lug device (15) comprises a lifting lug longitudinal moving frame (29) which is longitudinally arranged on the supporting device (12); the lifting point A (9) and the lifting point B (10) are arranged at two ends of the lifting lug longitudinal moving frame (29); a movable lug seat (31) is driven by a push rod to move longitudinally on the lug longitudinal moving frame (29);
a lifting lug B end limiting block (30) is arranged at the lifting point B (10), and a lifting lug B end transverse blocking rod (32) for blocking the movement of the movable lifting lug seat (31) is arranged at the output end of the lifting lug B end limiting block (30);
the lifting point A (9) and the lifting point B (10) have the same structure; the output end of the lifting point A (9) is provided with a transverse stop rod (33) at the end A of the lifting lug for stopping the movement of the movable lifting lug seat (31).
6. The dual-machine cooperative hoisting system for the railway deep cut highway bridge spanned over the under-construction according to claim 3, wherein: the auxiliary lifting device (16) comprises an auxiliary support (34) arranged on the supporting device (12), an auxiliary rotating shaft (35) driven by a motor in a transmission mode is arranged on the auxiliary support (34), an auxiliary swinging arm (36) driven by the auxiliary rotating shaft (35) to swing is arranged under the auxiliary swinging arm (36), and an auxiliary hanging rope (37) is connected under the auxiliary swinging arm (36) in a swinging mode.
7. A dual-machine cooperative hoisting method for an overpass railway deep cutting highway bridge under construction is characterized by comprising the following steps: by means of a dual-machine cooperative hoisting system of an overpass railway deep cutting highway bridge under construction; the method comprises the following steps;
step one, executing a side span box girder hoisting scheme;
firstly, a crane A (2) and a crane B (3) are both positioned on a roadbed, and station positions are determined according to operation conditions and crane performance parameters; then, mounting the lifting auxiliary device (11) on the beam (1); secondly, the crane A (2) and the crane B (3) respectively hook a lifting point A (9) and a lifting point B (10) of the beam body (1), wherein a steel wire rope of the crane B (3) is connected with a movable lifting lug seat (31) positioned at the lifting point B (10) to test lifting, after safety and stability are confirmed, lifting is started, an included angle between a monitoring side vertical frame (26) and a monitoring swinging rod (28) is observed, observation of the beam body (1) is realized, and whether the beam body is lifted correctly or not is determined;
firstly, lifting the beam piece (1) by the crane A (2) and the crane B (3) and then performing rotation to the direction along the bridge; then, the double machines cooperatively operate to lift the beam piece (1) to a conversion station (7), and one end of the beam piece (1) is stably placed at a temporary supporting point arranged on the cutting slope platform; secondly, the movable lifting lug seat (31) moves to the lifting point A (9) and is blocked by a transverse blocking rod (33) at the end A of the lifting lug to realize that the crane B (3) is hooked and hung at the lifting point A (9);
firstly, transferring a crane A (2) to a moat hoisting station; then, the auxiliary rotating shaft (35) drives the auxiliary swing arm (36) to swing upwards, and meanwhile, the end part of the auxiliary hanging rope (37) is conveyed to a moat hoisting station by using inertia force; and secondly, the crane A (2) hooks the auxiliary hanging rope (37), and the beam piece (1) is dropped to complete the hoisting after reaching the position of the side span (6).
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112411381A (en) * | 2020-10-26 | 2021-02-26 | 中交路桥建设有限公司 | Construction method for erecting precast box girder of overbridge in deep cutting area |
| CN112758803A (en) * | 2021-01-18 | 2021-05-07 | 张鸿杰 | Overhead hook replacement technology for hoisting prefabricated box girder |
| CN113403951A (en) * | 2021-06-23 | 2021-09-17 | 中建三局基础设施建设投资有限公司 | Construction method for hoisting bridge deck slab of steel truss bridge under limited clearance condition |
| CN113931077A (en) * | 2021-11-25 | 2022-01-14 | 中国能源建设集团安徽电力建设第一工程有限公司 | Construction method for erecting prefabricated box girder bridge girder erection machine in limited construction space |
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2020
- 2020-06-30 CN CN202010611753.1A patent/CN111717797A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112411381A (en) * | 2020-10-26 | 2021-02-26 | 中交路桥建设有限公司 | Construction method for erecting precast box girder of overbridge in deep cutting area |
| CN112758803A (en) * | 2021-01-18 | 2021-05-07 | 张鸿杰 | Overhead hook replacement technology for hoisting prefabricated box girder |
| CN112758803B (en) * | 2021-01-18 | 2023-12-22 | 张鸿杰 | Method for hanging prefabricated box girder and changing hooks in air |
| CN113403951A (en) * | 2021-06-23 | 2021-09-17 | 中建三局基础设施建设投资有限公司 | Construction method for hoisting bridge deck slab of steel truss bridge under limited clearance condition |
| CN113931077A (en) * | 2021-11-25 | 2022-01-14 | 中国能源建设集团安徽电力建设第一工程有限公司 | Construction method for erecting prefabricated box girder bridge girder erection machine in limited construction space |
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