Steel box girder hoisting anti-inclination device and anti-inclination method thereof

Abstract

The invention discloses a steel box girder hoisting anti-inclination device and an anti-inclination method thereof, and belongs to the technical field of steel box girder hoisting construction.The steel box girder hoisting anti-inclination device comprises a vertically-arranged steel pipe column, and the top and the bottom of the steel pipe column are each provided with a square plate; the upper end face of the square plate located at the top of the steel pipe column is provided with a fixing bolt used for being fixedly connected with a steel box girder bottom plate, and the lower end face of the square plate located at the bottom of the steel pipe column is connected with a concrete foundation. According to the steel box girder hoisting anti-tilting device and the steel box girder hoisting anti-tilting method, compared with the situation that hoisting is carried out without a girder body overturning prevention measure, the safety risk of hoisting construction of a small-curvature-radius steel box girder can be effectively reduced, and overturning of the steel box girder in the hoisting process is prevented. Compared with a traditional measure that a support is erected on the overhanging side of the steel box girder to prevent the steel box girder from overturning, the construction progress can be effectively accelerated, manpower is saved, and the engineering cost is reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of steel box girder hoisting construction, and particularly relates to a steel box girder hoisting anti-tilting device and an anti-tilting method thereof. Background Art

[0002] With the development of my country's steel industry and steel structure technology, the number of steel structure bridges has continued to increase. Among them, steel box girder bridges have the advantages of light weight, high strength, and good integrity. They have been widely used in municipal bridges such as urban viaducts, river-crossing bridges, and large landscape bridges. "Scaffolding method + segmented lifting" is the main construction method for steel box girder bridges. It uses a small number of brackets and uses equipment such as automobile cranes to lift and assemble box girders in segments. It has the characteristics of mature construction technology, low cost, and fast construction speed, and is widely used.

[0003] In actual construction, preventing the overturning of curved steel box girders has always been an important technical difficulty. Compared with straight steel box girders, the support points of the lower structure of curved steel box girders are not on the same straight line, so their force characteristics are very different from those of straight beam bridges. Since curved steel box girders will produce large constrained torsion under or without symmetrical loads, and most of the torque generated by the dead load of the steel box girder is balanced by the beam end supports, this can easily cause serious uneven lateral force distribution at the beam end supports, and even negative reaction force, which may cause the curved steel box girder to overturn laterally.

[0004] In the actual hoisting construction process of steel box girders, the overturning moment and stability moment are calculated, and the temporary support position of the small curvature radius steel box girder is adjusted to prevent overturning. However, there are few temporary measures for hoisting anti-overturning. At present, the common method is to set a continuous support frame on the cantilever side of the small curvature radius steel box girder and apply vertical support force to the cantilever end to prevent the steel box girder from lateral overturning.

[0005] The above-mentioned hoisting method of setting a continuous support frame on the cantilever side of the small curvature radius steel box beam has the following problems: 1. Setting up continuous support frames consumes a lot of time and manpower, increasing construction costs.

[0006] 2. The continuous support frame support method has unstable support effect for steel box girders with small curvature radius. Since the steel box girder with small curvature radius is a curved line, it is difficult to ensure that the line shape of the support frame is consistent with the line shape of the box girder. If the line shape deviation is large, it may cause the support and the steel box girder to overturn as a whole. Summary of the invention

[0007] In view of the deficiencies in the above-mentioned background technology, the present invention aims to provide a steel box girder hoisting anti-tilt device and an anti-tilt method thereof, which solves the problem that the existing hoisting method of setting a continuous support frame on the cantilevered side of the steel box girder with a small curvature radius has an unstable supporting effect for the steel box girder with a small curvature radius, which may cause the bracket and the steel box girder to tilt laterally as a whole.

[0008] In order to achieve the above-mentioned object of the invention, the technical solution adopted by the present invention is as follows: A steel box girder hoisting anti-tilt device is provided, which includes a vertically arranged steel pipe column, wherein a square plate is arranged on the top and bottom of the steel pipe column, the upper end surface of the square plate located at the top of the steel pipe column is provided with fixing bolts for fixing connection with the bottom plate of the steel box girder, and the lower end surface of the square plate located at the bottom of the steel pipe column is connected to a concrete foundation.

[0009] Furthermore, a plurality of vertical stiffening plates are arranged between the two square plates and the outer wall of the steel pipe column.

[0010] Furthermore, a plurality of anchoring steel bars for fixed connection with the concrete foundation are arranged on the square plate at the bottom of the steel pipe column.

[0011] Furthermore, a threaded connection hole is provided on the square plate located at the top of the steel pipe column, and the fixing bolt is threadedly connected to the square plate through the threaded connection hole.

[0012] The present invention also provides an anti-tilt method for a steel box girder hoisting anti-tilt device, which comprises: Step 1, calculate the stability coefficient of the steel box girder; Step 2: determine whether the stability coefficient of the steel box girder is greater than the anti-overturning safety coefficient. If so, the steel box girder is hoisted without using the steel box girder hoisting anti-overturning device; if not, proceed to step 3; Step 3, calculate the connection point of the steel box girder hoisting anti-tilt device on the bottom plate of the steel box girder, and drill holes at the connection points to reserve bolt fixing holes; Step 4: Connect the entire steel box girder hoisting anti-tilt device to the bottom plate of the steel box girder by fixing it with the fixed bolts and the reserved bolt fixing holes. Finally, remove the entire steel box girder hoisting anti-tilt device when the steel box girder is hoisted and welded.

[0013] Further, in step 1, the center of gravity of the stable part of the steel box girder, the center of gravity of the overturned part of the steel box girder and the overturning rotation axis are obtained by software; the formula for calculating the stability coefficient of the steel box girder is:

[0014] Among them, G wd To stabilize part of the box weight; L wd G is the distance from the center of gravity of the stable part of the box to the overturning rotation axis; qfL is the weight of the overturned part of the box; qf It is the distance from the center of gravity of the overturned part of the box to the overturning rotation axis.

[0015] Furthermore, in step 2, the formula for the anti-overturning safety factor is:

[0016] Among them, r is the anti-overturning safety factor, which is 2.5; is the stabilizing moment of the steel box girder; is the overturning moment of the steel box girder.

[0017] Further, in step 3, the method for calculating the connection point of the steel box girder hoisting anti-tilt device is: After using the anti-overturning temporary connection device, the stability of the hoisted steel box girder meets the following requirements:

[0018] From the above formula, we can deduce:

[0019] Where r is the safety factor of overturning stability; To stabilize part of the box weight; L wd G is the distance from the center of gravity of the stable part of the box to the overturning rotation axis; qf L is the weight of the overturned part of the box; qf The distance from the center of gravity of the overturned part of the box to the overturning rotation axis; It is the tension applied by the anti-tilt device of steel box girder hoisting on the bottom plate of steel box girder, and the value is determined according to the tensile strength of the material; It is the vertical distance from the connection point of the steel box girder hoisting anti-tilt device to the overturning rotation axis;

[0020] Where R is the bending radius of the steel box girder; S is the straight-line distance between the two outer supports; It is the starting distance of the connection point of the steel box girder hoisting anti-tilt device, that is, the distance from the connection point of the steel box girder hoisting anti-tilt device to the intersection of the line connecting the centers of gravity of the two parts of the steel box girder and the inner line of the steel box girder.

[0021] The beneficial effects of the present invention are: 1. Compared with the situation of hoisting without anti-overturning measures for the beam body, the anti-overturning device and anti-overturning method of the steel box beam hoisting in the present invention can effectively reduce the safety risk of hoisting construction of steel box beams with small curvature radius and prevent overturning of steel box beams during hoisting. Compared with the traditional measure of setting up brackets on the cantilever side of the steel box beam to prevent the steel box beam from overturning, it can effectively speed up the construction progress, save manpower and reduce engineering costs.

[0022] 2. Compared with the traditional measure of setting up a bracket on the cantilever side of the steel box girder to prevent the steel box girder from overturning, the anti-tilt device and anti-tilt method for hoisting the steel box girder in the present invention has a more stable supporting effect and is simple to construct. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 The figure is a structural schematic diagram of a steel box girder hoisting anti-tilt device.

[0024] Figure 2 This is a structural schematic diagram of the connection between the steel box girder hoisting anti-tilt device and the steel box girder.

[0025] Figure 3 This is the schematic diagram for the stability calculation of steel box girder.

[0026] Figure 4 This is the layout diagram of the connection points of the anti-tilt device for hoisting the steel box girder.

[0027] Among them, 1. fixing bolts; 2. steel pipe columns; 3. square plates; 4. vertical stiffening plates; 5. anchoring steel bars; 6. concrete foundation; 7. steel box beams. DETAILED DESCRIPTION

[0028] The specific implementation modes of the present invention are described below so that those skilled in the art can understand the present invention. However, it should be clear that the present invention is not limited to the scope of the specific implementation modes. For those of ordinary skill in the art, as long as various changes are within the spirit and scope of the present invention as defined and determined by the attached claims, these changes are obvious, and all inventions and creations utilizing the concept of the present invention are protected.

[0029] like Figure 1~Figure 2 As shown, the present invention provides a steel box girder hoisting anti-tilt device, which includes a vertically arranged steel pipe column 2, wherein a square plate 3 is arranged at the top and bottom of the steel pipe column 2, and the upper end surface of the square plate 3 located at the top of the steel pipe column 2 is provided with a fixing bolt 1 for fixing connection with the bottom plate of the steel box girder 7, and the lower end surface of the square plate 3 located at the bottom of the steel pipe column 2 is connected to a concrete foundation 6.

[0030] like Figure 2 As shown, the basic principle of the steel box girder hoisting anti-tilt device is: a single temporary connecting bracket (i.e., the steel box girder hoisting anti-tilt device) is added under the original temporary double-row bracket to connect the bottom plate of the steel box girder 7, and apply tension to the steel box girder 7 to prevent overturning.

[0031] Preferably, but not limited to, multiple vertical stiffening plates 4 are arranged between the two square plates 3 and the outer wall of the steel pipe column 2. The arrangement of multiple vertical stiffening plates 4 can increase the connection strength between the square plates 3 and the steel pipe column 2, making the connection more firm and reliable. The square plates 3 located at the bottom of the steel pipe column 2 are provided with multiple anchoring steel bars 5 for fixed connection with the concrete foundation 6, and the anchoring steel bars 5 increase the connection strength between the square plates 3 and the concrete foundation 6.

[0032] Furthermore, a threaded connection hole is provided on the square plate 3 located at the top of the steel pipe column 2, and the fixing bolt 1 is threadedly connected to the square plate 3 through the threaded connection hole. This arrangement facilitates the assembly and disassembly of the steel box girder hoisting anti-tilt device and the steel box girder bottom plate, facilitates on-site construction, and speeds up the loading and unloading efficiency of the steel box girder hoisting anti-tilt device and the steel box girder hoisting construction efficiency.

[0033] The present invention also provides an anti-tilt method for a steel box girder hoisting anti-tilt device, which comprises: Step 1, calculating the stability coefficient of the steel box girder 7; Step 2: determine whether the stability coefficient of the steel box girder 7 is greater than the anti-overturning safety coefficient. If so, do not use the steel box girder hoisting anti-overturning device to hoist the steel box girder 7; if not, proceed to step 3; Step 3, calculate the connection point of the steel box girder hoisting anti-tilt device on the bottom plate of the steel box girder 7, and drill holes at the connection points to reserve bolt fixing holes; Step 4, connect the entire steel box girder hoisting anti-tilt device to the bottom plate of the steel box girder 7 by fixing the fixing bolts 1 with the reserved bolt fixing holes, and finally remove the entire steel box girder hoisting anti-tilt device when the steel box girder 7 is hoisted and welded.

[0034] Furthermore, if Figure 3 and Figure 4 As shown, in step 1, the center of gravity of the stable part of the steel box girder 7, the center of gravity of the overturned part of the steel box girder 7 and the overturning rotation axis are obtained by software; the formula for calculating the stability coefficient of the steel box girder 7 is:

[0035] Among them, G wd To stabilize part of the box weight; L wd G is the distance from the center of gravity of the stable part of the box to the overturning rotation axis; qf L is the weight of the overturned part of the box; qf It is the distance from the center of gravity of the overturned part of the box to the overturning rotation axis.

[0036] Furthermore, in step 2, the formula for the anti-overturning safety factor is:

[0037] Among them, r is the anti-overturning safety factor, which is 2.5; is the stabilizing moment of the steel box girder 7; is the overturning moment of the steel box girder 7.

[0038] Further, in step 3, the method for calculating the connection point of the steel box girder hoisting anti-tilt device is: After using the anti-overturning temporary connection device, the stability of the hoisted steel box girder 7 meets the following requirements:

[0039] From the above formula, we can deduce:

[0040] Where r is the safety factor of overturning stability; To stabilize part of the box weight; L wd G is the distance from the center of gravity of the stable part of the box to the overturning rotation axis; qf L is the weight of the overturned part of the box; qf The distance from the center of gravity of the overturned part of the box to the overturning rotation axis; The tensile force applied by the anti-tilt device for hoisting the steel box girder to the bottom plate of the steel box girder 7 is determined according to the tensile strength of the material; It is the vertical distance from the connection point of the steel box girder hoisting anti-tilt device to the overturning rotation axis;

[0041] Wherein, R is the bending radius of the steel box girder 7; S is the straight-line distance between the two outer supports; It is the starting distance of the connection point of the steel box girder hoisting anti-tilt device, that is, the distance from the connection point of the steel box girder hoisting anti-tilt device to the intersection of the center of gravity line of the two parts of the steel box girder 7 and the inner line of the steel box girder 7.

[0042] In summary, the anti-tilt device and anti-tilt method for hoisting a steel box girder in the present invention can effectively reduce the safety risk of hoisting a steel box girder with a small curvature radius and prevent the steel box girder 7 from tipping over during the hoisting process, compared with the situation of hoisting without anti-tipping measures for the beam body. Compared with the traditional measure of setting up a bracket support on the cantilever side of the steel box girder to prevent the steel box girder from tipping over, it can effectively speed up the construction progress, save manpower, and reduce engineering costs.

Claims

1. A steel box girder hoisting anti-tilt device, characterized in that: It includes a vertically arranged steel pipe column, wherein a square plate is arranged at the top and bottom of the steel pipe column, the upper end surface of the square plate located at the top of the steel pipe column is provided with fixing bolts for fixing connection with the bottom plate of the steel box beam, and the lower end surface of the square plate located at the bottom of the steel pipe column is connected to a concrete foundation.

2. The steel box girder hoisting anti-tilt device according to claim 1 is characterized in that: A plurality of vertical stiffening plates are arranged between the two square plates and the outer wall of the steel pipe column.

3. The steel box girder hoisting anti-tilt device according to claim 1 is characterized in that: The square plate at the bottom of the steel pipe column is provided with a plurality of anchoring steel bars for fixed connection with the concrete foundation.

4. The steel box girder hoisting anti-tilt device according to claim 2 is characterized in that: The square plate at the top of the steel pipe column is provided with a threaded connection hole, and the fixing bolt is threadedly connected with the square plate through the threaded connection hole.

5. An anti-tilt method for the steel box girder hoisting anti-tilt device according to any one of claims 1 to 4, characterized in that: include: Step 1, calculate the stability coefficient of the steel box girder; Step 2: determine whether the stability coefficient of the steel box girder is greater than the anti-overturning safety coefficient. If so, the steel box girder is hoisted without using the steel box girder hoisting anti-overturning device; if not, proceed to step 3; Step 3, calculate the connection point of the steel box girder hoisting anti-tilt device on the bottom plate of the steel box girder, and drill holes at the connection points to reserve bolt fixing holes; Step 4: Connect the entire steel box girder hoisting anti-tilt device to the bottom plate of the steel box girder by fixing it with the fixed bolts and the reserved bolt fixing holes. Finally, remove the entire steel box girder hoisting anti-tilt device when the steel box girder is hoisted and welded.

6. The anti-tilt method of the steel box girder hoisting anti-tilt device according to claim 5, characterized in that: In step 1, the center of gravity of the stable part of the steel box girder, the center of gravity of the overturned part of the box girder and the overturning rotation axis are obtained by software; The formula for calculating the stability coefficient of the steel box girder is: Among them, G wd To stabilize part of the box weight; L wd G is the distance from the center of gravity of the stable part of the box to the overturning rotation axis; qf L is the weight of the overturned part of the box; qf It is the distance from the center of gravity of the overturned part of the box to the overturning rotation axis.

7. The anti-tilt method of the steel box girder hoisting anti-tilt device according to claim 6, characterized in that: In step 2, the formula for the safety factor against overturning is: Among them, r is the anti-overturning safety factor, which is 2.5; is the stabilizing moment of the steel box girder; is the overturning moment of the steel box girder.

8. The anti-tilt method of the steel box girder hoisting anti-tilt device according to claim 7, characterized in that: In step 3, the method for calculating the connection points of the steel box girder hoisting anti-tilt device is: After using the temporary anti-overturning connection device, the stability of the hoisted steel box girder meets the following requirements: From the above formula, we can deduce: Where r is the safety factor of overturning stability; To stabilize part of the box weight; L wd G is the distance from the center of gravity of the stable part of the box to the overturning rotation axis; qf L is the weight of the overturned part of the box; qf The distance from the center of gravity of the overturned part of the box to the overturning rotation axis; It is the tension applied by the anti-tilt device of steel box girder hoisting on the bottom plate of steel box girder, and the value is determined according to the tensile strength of the material; It is the vertical distance from the connection point of the steel box girder hoisting anti-tilt device to the overturning rotation axis; Where R is the bending radius of the steel box girder; S is the straight-line distance between the two outer supports; It is the starting distance of the connection point of the steel box girder hoisting anti-tilt device, that is, the distance from the connection point of the steel box girder hoisting anti-tilt device to the intersection of the line connecting the centers of gravity of the two parts of the steel box girder and the inner line of the steel box girder.

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