CN112591599B - Anti-fatigue prestressed variable-section steel crane beam and manufacturing method thereof - Google Patents
Anti-fatigue prestressed variable-section steel crane beam and manufacturing method thereof Download PDFInfo
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- CN112591599B CN112591599B CN202110237565.1A CN202110237565A CN112591599B CN 112591599 B CN112591599 B CN 112591599B CN 202110237565 A CN202110237565 A CN 202110237565A CN 112591599 B CN112591599 B CN 112591599B
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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
- B66C1/00—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles
- B66C1/10—Load-engaging elements or devices attached to lifting or lowering gear of cranes or adapted for connection therewith for transmitting lifting forces to articles or groups of articles by mechanical means
- B66C1/12—Slings comprising chains, wires, ropes, or bands; Nets
Abstract
The invention relates to an anti-fatigue prestressed variable-section steel crane beam and a manufacturing method thereof, wherein the steel crane beam is provided with an upper flange, a lower flange, a web plate and an end plate, and also comprises an anchoring end, a steering gear, a prestressed steel strand and an anchorage device which are symmetrically arranged at two sides of the web plate, and the steel crane beam is also provided with a plurality of first vertical stiffening ribs and two second vertical stiffening ribs, and the length of the second vertical stiffening ribs is smaller than that of the first vertical stiffening ribs; the anchoring ends are welded at the through holes of the steel strands on the end plates at the two ends; the two steering gears are respectively fixed at the bottom end of one second vertical stiffening rib; the steel strand bypasses the steering gear, and two ends of the steel strand penetrate through the steel strand through hole and are anchored at the anchoring end through an anchorage device. The method is particularly suitable for pre-reinforcing the steel crane beam before the construction of a newly-built building, hardly changes the structure of the steel crane beam, is simple and convenient to construct, short in period, economical and reliable, and can remarkably improve the fatigue resistance of the variable section steel crane beam.
Description
Technical Field
The invention belongs to the technical field of civil engineering steel crane beams, and particularly relates to an anti-fatigue prestressed variable-section steel crane beam and a manufacturing method thereof.
Background
The steel structure industrial building of China is large in quantity and wide in range, various in types, large in service time span, severe in replacement environment, universal in overload overrun overtime use, and factory building safety accidents happen due to the reasons of strength, fatigue, instability and the like. For industrial buildings, a large number of steel crane beams are in severe environment and are heavy in load and bear dynamic load, fatigue cracks begin to appear at the variable cross sections of the support seats of the steel crane beams with the partial variable cross sections after the steel crane beams are generally put into production for more than ten years, and the accidents of fatigue fracture occur at present, so that the safety production is greatly influenced, secondary disasters are easily caused, and the economic loss is huge. The prestress reinforcing method is a method for reinforcing the whole steel structure or a member by adding prestress steel strands and is characterized in that prestress is applied to change the internal force distribution of the original steel structure and reduce the stress level of the original steel structure, the later adding part and the original structure can work together well, and the total bearing capacity of the steel structure can be obviously improved. The prestress reinforcing method has triple effects of reinforcing an original steel structure, changing the rigidity of the original structure and changing the internal force of the original structure, is suitable for reinforcing a large-span steel structure, reinforcing a large-scale steel structure in a high stress and strain state, which cannot be reinforced by adopting a common method or has an unsatisfactory reinforcing effect, and has the characteristics of convenience in construction, economy, reliability, independent corrosion prevention and replacement of prestressed tendons (tendons) and the like.
The prestress technology can also be applied to newly-built steel structure crane beams, future fatigue problems are considered in advance in the design and construction stages of the newly-built steel structure crane beams, but the fatigue resistance application of the newly-built steel crane beam structure in the prior art is less considered, relevant documents for the research are less, individual reinforcing measures are still only the defect of considering the lower flange stress of the crane beam, the development of fatigue cracks of the variable-section steel crane beam at the variable-section position, which is widely applied to heavy industrial plants and meets the requirements of production process and bearing capacity and adapts to unequal column spacing design, is rarely considered, and in fact, the brought structural fatigue damage needs to be paid attention. Therefore, it is necessary to conduct an intensive research on the fatigue of the steel crane beam, especially the fatigue failure of the variable cross-section steel crane beam, to provide an effective anti-fatigue measure, improve the anti-fatigue failure capability of the structure, and enhance the durability of the structure.
Disclosure of Invention
The invention aims to supplement the defects of the existing fatigue reinforcing method, provides an anti-fatigue prestressed variable-section steel crane beam and a manufacturing method thereof, is particularly suitable for pre-reinforcing the steel crane beam before the construction of a new building, hardly changes the structure of the steel crane beam, is simple and convenient to construct, short in period, economical and reliable, and can remarkably improve the anti-fatigue performance of the variable section of the variable-section steel crane beam.
In order to achieve the purpose, the technical scheme of the invention is as follows:
the invention firstly provides an anti-fatigue prestressed variable cross-section steel crane beam, which comprises an upper flange, a lower flange, a web plate, an end plate, anchoring ends, a steering gear, a prestressed steel strand and an anchorage device, wherein the anchoring ends, the steering gear, the prestressed steel strand and the anchorage device are symmetrically arranged at two sides of the web plate,
the steel crane beam is also provided with vertical stiffening ribs, the vertical stiffening ribs are vertically welded and fixed with the upper flange and the web plate, and comprise a plurality of first vertical stiffening ribs positioned in the span of the steel crane beam and two second vertical stiffening ribs positioned at two ends of the steel crane beam, and the length of each second vertical stiffening rib is smaller than that of each first vertical stiffening rib;
steel strand through holes are formed in the end plates at the two ends of the steel crane beam in advance according to the designed positions;
the anchoring ends are welded at the through holes of the steel strands on the end plates at the two ends and anchored at the outer sides of the end plates;
the two steering gears are respectively fixed at the bottom end of one second vertical stiffening rib;
the steel strand bypasses the steering gear, and two ends of the steel strand penetrate through the steel strand through hole and are anchored at the anchoring end through an anchorage device.
In one embodiment, the anchoring end is composed of an anchor plate and two anchor plate stiffening plates, wherein the anchor plate is provided with an anchor hole, the anchor plate is arranged on the outer side surfaces of the end plates at two ends of the steel crane beam, and the two anchor plate stiffening plates are welded on the inner side surfaces of the end plates and the web plate, are arranged on two sides of the steel strand and are parallel to the steel strand.
In one embodiment, the steering gear is made of a section of round steel tube, and the round steel tube is perpendicular to the web plate and is installed at the bottom end of the second vertical stiffening rib and is welded and fixed with the web plate and the bottom end of the second vertical stiffening rib.
In one embodiment, the circular steel tube is vertically welded with a stiffening rib inside, and the stiffening rib and the second vertical stiffening rib are located in the same plane.
In one embodiment, the round steel pipe is welded with one limiting plate on each of two sides of the steel strand, a limiting groove is formed between the two limiting plates, and the steel strand bypasses the round steel pipe from the limiting groove.
In one embodiment, the edge of the first vertical stiffening rib is provided with a notch corresponding to the position of the steel strand for the steel strand to pass through.
In one embodiment, the steel strand has a direction substantially identical to the shape of the variable cross-section of the steel crane beam, and a three-fold steel strand is formed and comprises a straight line section and two inclined line sections, and the inclined line sections are approximately vertical to the fatigue crack development trend at the variable cross-section of the steel crane beam.
In one embodiment, the bottom end of the second vertical stiffener extends to be flush with or slightly below the variable cross-section of the steel crane beam, such that the straight line segment of the three-folded steel strand corresponds to or is slightly below the variable cross-section of the steel crane beam.
In one embodiment, the acute angle enclosed between the two diagonal and straight line segments is no more than 15 °.
The invention also provides a manufacturing method of the fatigue-resistant prestressed variable-section steel crane beam, which comprises the following steps of:
cutting and blanking plates required for manufacturing the variable-section steel crane beam according to a design drawing, and welding and assembling an upper flange, a lower flange and a web plate of the steel crane beam;
welding end plates at two ends of the steel crane beam respectively, and arranging steel strand through holes on the end plates according to the designed positions;
welding a plurality of first vertical stiffening ribs in the span of the steel crane beam, forming an opening at the outer edge of each first vertical stiffening rib according to a design position for a steel strand to pass through, welding two second vertical stiffening ribs at two ends of the steel crane beam, wherein the bottom ends of the second vertical stiffening ribs are flush with or slightly lower than the variable cross section of the steel crane beam;
welding a pitch of round steel pipe at the bottom end of the second vertical stiffening rib, welding the stiffening rib inside the round steel pipe, and welding two limiting plates at the bottom of the round steel pipe, wherein a steel strand limiting groove is formed between the two limiting plates for a steel strand to pass through;
arranging an anchor plate on the outer side surface of the end plate, wherein the outer surface of the anchor plate is vertical to the steel strand, an anchor hole is formed in the center of the anchor plate, two anchor plate stiffening plates are arranged on the inner side surface of the end plate in a direction parallel to the steel strand, and the anchor plate stiffening plates are welded with the end plate and the web plate;
and the steel strand penetrates through the anchor hole of the anchor plate, bypasses the round steel tube and passes through the opening, anchors the two ends of the steel strand on the anchor plate by using an anchorage device, applies prestress with design requirements by stretching and drawing the two ends, and completes the manufacture of the anti-fatigue prestress variable-section steel crane beam.
Compared with the prior art, the invention has the beneficial effects that: according to the anti-fatigue prestressed variable-section steel crane beam and the manufacturing method thereof, the variable-section steel crane beam is tensioned by the high-strength steel strands, the integral rigidity of the beam body is increased, the tensile stress of the variable section and the lower flange of the steel crane beam is reduced by utilizing the high-strength performance of the prestressed steel strand material, the fatigue life of the steel crane beam is prolonged, and the anti-fatigue effect of the structure is realized.
Specific advantages of the invention include:
(1) the anti-fatigue prestress reinforcement hardly increases the dead weight of the original structure, the high strength performance of the prestress steel strand material is fully utilized, and the fatigue life of the steel crane beam is greatly prolonged;
(2) the steel crane beam is pre-reinforced before the construction of a newly-built building, the structure of the steel crane beam is hardly changed, the construction is simple and convenient, the period is short, and the steel crane beam is economical and reliable;
(3) the method has the advantages that targeted reinforcement measures are taken at key nodes such as an anchoring end and a steering gear of the reinforced structure, so that the reliability of the whole reinforcement measure is ensured;
(4) the stiffening ribs of the existing steel crane beam are modified appropriately, the steering gear is arranged, and the arrangement position of the steering gear can ensure that the prestress reinforced structure can well inhibit the development of fatigue cracks at the variable section of the steel crane beam with the variable section;
(5) the structure of the steering gear ensures smooth transition and steering of the three-fold-line steel strand;
(6) the fatigue resistance of the variable cross-section steel crane beam is improved by the arrangement mode of the three-fold line steel strands, and the defect that the lower flange tensile stress can only be reduced by the conventional lower flange linear steel strands is overcome.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.
The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so that those skilled in the art can understand and read the present invention, and do not limit the conditions for implementing the present invention, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the functions and purposes of the present invention, shall fall within the scope covered by the technical contents disclosed in the present invention.
FIG. 1 is a schematic structural view of a right-angle sudden-change type anti-fatigue prestressed variable-section steel crane beam of the invention;
FIG. 2 is a cross-sectional view taken along line A-A of FIG. 1;
FIG. 3 is a cross-sectional view taken along line B-B of FIG. 1;
FIG. 4 is a cross-sectional view taken along line C-C of FIG. 1;
FIG. 5 is a schematic structural view of a circular arc transition type fatigue-resistant prestressed variable-section steel crane beam;
FIG. 6 is a structural schematic diagram of a trapezoidal transition type fatigue-resistant prestressed variable-section steel crane beam.
In the figure: 1-upper flange, 2-lower flange, 3-web, 4-end plate, 5-local vertical stiffening rib, 6-longitudinal stiffening rib, 7-first vertical stiffening rib, 8-second vertical stiffening rib, 9-steel strand, 10-anchorage device, 11-anchor plate, 12-anchor plate stiffening plate, 13-steel strand through hole, 14-round steel tube, 15-stiffening rib, 16-limiting plate, 17-notch and 18-fatigue crack.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the embodiments of the present invention are described in further detail below with reference to the embodiments and the accompanying drawings. The exemplary embodiments and descriptions of the present invention are provided to explain the present invention, but not to limit the present invention.
In the present invention, the terms "comprises/comprising," "consisting of … …," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a product, apparatus, process, or method that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such product, apparatus, process, or method if desired. Without further limitation, an element defined by the phrases "comprising/including … …," "consisting of … …," or "comprising" does not exclude the presence of other like elements in a product, device, process, or method that comprises the element.
It is to be understood that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are intended to be open-ended, i.e., to mean either a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
It will be further understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," and the like, refer to an orientation or positional relationship illustrated in the drawings for convenience in describing the present invention and to simplify description, and do not indicate or imply that the referenced device, component, or structure must have a particular orientation, be constructed in a particular orientation, or be operated in a particular manner, and should not be construed as limiting the present invention.
Furthermore, the terms "first", "second" and "first" 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. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.
The technical solution of the present invention is specifically explained below with reference to the accompanying drawings.
The invention firstly discloses an anti-fatigue prestressed variable-section steel crane beam, which is provided with an upper flange 1, a lower flange 2, a web 3 and an end plate 4, and is characterized in that the steel crane beam is provided with a local vertical stiffening rib 5 and a longitudinal stiffening rib 6, wherein the longitudinal stiffening rib 6 is arranged along the whole length of the steel crane beam, two ends of the longitudinal stiffening rib are fixedly welded with the end plate 4, the local vertical stiffening rib 5 is fixedly welded with the upper flange 1, the web 3 and the longitudinal stiffening rib 6, and a plurality of local vertical stiffening ribs 5 are uniformly arranged in the full-length range of the longitudinal stiffening rib 6.
The steel crane beam is also provided with vertical stiffening ribs, the vertical stiffening ribs are arranged perpendicular to the web 3, the upper ends of the vertical stiffening ribs are perpendicularly welded and fixed with the upper flange 1, the inner sides of the vertical stiffening ribs are perpendicularly welded and fixed with the web 3, and the vertical stiffening ribs comprise a plurality of first vertical stiffening ribs 7 positioned in the span and two second vertical stiffening ribs 8 positioned at two ends; the first vertical stiffener 7 is longer and the second vertical stiffener 8 is shorter, and it should be noted that the term "shorter" is used herein to refer to a length of the first vertical stiffener 7 that is shorter than the first vertical stiffener 7, and the second vertical stiffener 8 also extends downward from the upper flange 1, but is still a certain distance away from the lower flange 2 because its length is shorter than the first vertical stiffener 7. As can be seen from fig. 1, 5 and 6, the second vertical stiffeners 8 extend substantially down to or slightly below the variable cross-section of the steel crane beam, which is particularly important for the arrangement and orientation of the prestressed steel strands.
The steel crane beam also comprises anchoring ends, steering gears, prestressed steel strands 9 and an anchorage device 10 which are symmetrically arranged on two sides of the web 3.
And steel strand through holes 13 are formed in the end plates 4 at the two ends of the steel crane beam in advance according to the designed positions, and the steel strand through holes 13 are used for penetrating the steel strands 9.
The anchoring ends are welded at the steel strand through holes 13 on the end plates 4 at the two ends and anchored at the outer sides of the end plates 4;
referring to fig. 2, in the present invention, the anchoring end is composed of an anchor plate 11 and two anchor plate stiffening plates 12, the anchor plate 11 is provided with an anchor hole (not shown in the figure), the anchor plate 11 is arranged on the outer side surfaces of the end plates 4 at the two ends of the steel crane beam and is closely placed on the surfaces of the end plates 4, and the anchor hole is opposite to the steel strand through hole 13 on the end plate 4.
The two anchor plate stiffening plates 12 are arranged on the inner side surface of the end plate 4 and are welded and fixed with the inner side surface of the end plate 4 and the web plate 3, and meanwhile, the two anchor plate stiffening plates 12 are arranged on two sides of the steel stranded wire 9 and are parallel to the steel stranded wire 9. The two anchor plate stiffening plates 12 provide reliable supporting strength for the anchoring end, and make up for the insufficient strength of the single anchoring on the end plate 4.
Referring again to fig. 3, there are two diverters, each secured to the bottom end of a second vertical stiffener 8.
In the invention, the steering gear is made of a pitch of round steel pipe 14, the round steel pipe 14 is perpendicular to the web plate 3 and is installed at the bottom end of the second vertical stiffening rib 8, and the round steel pipe 14 is welded and fixed with the web plate 3 and the bottom end of the second vertical stiffening rib 8. The circular steel tube steering gear can make it turn to steadily with the contact of prestressing force steel strand wires, can not produce too big angle of buckling, and steel strand wires and circular steel tube surface contact also can move more smoothly.
Referring to fig. 1 again, the round steel pipe 14 is vertically welded with the stiffening ribs 15, and the stiffening ribs 15 and the second vertical stiffening ribs 8 are located in the same plane. The stiffening ribs 15 and the second vertical stiffening ribs 8 form a whole, so that the supporting strength of the round steel pipe 14 is enhanced, and instability, deformation and damage caused when the steel strand 9 is tensioned are prevented.
Referring to fig. 3 again, a vertical limiting plate 16 is welded to the bottom surface of the circular steel tube 14, specifically, to the two sides of the steel strand, a limiting groove is formed between the two limiting plates 16, and the steel strand 9 bypasses the circular steel tube 14 from the limiting groove. The limiting groove can prevent the prestressed steel strand 9 from slipping off the round steel tube 14.
Based on the structure, the prestressed steel strand 9 bypasses the bottom surface of the steering gear, namely the round steel tube 14, the two ends of the prestressed steel strand penetrate through the steel strand through hole 13 on the end plate 4 and the anchor hole on the anchor plate 11, and the prestressed steel strand is anchored at the anchoring end through the anchor 10.
Referring to fig. 4 again, the edge of the first vertical stiffening rib 7 is provided with a gap 17 at a position corresponding to the steel strand, and the gap 17 is used for avoiding the steel strand for the steel strand to pass through.
Referring to fig. 1 again, the direction of the steel strand 9 is generally consistent with the shape of the variable cross section of the steel crane beam, namely the shape of the steel crane beam is consistent with the overall shape of the steel crane beam in the longitudinal direction, the steel strand 9 forms a three-fold steel strand comprising a straight line section and two inclined line sections, the fatigue resistance of the variable cross section of the steel crane beam can be improved by the three-fold arrangement mode, and the defect that the lower flange stress can only be reduced by the conventional straight steel strand or the steel strand arranged only on the lower flange is overcome.
As shown in fig. 1, 5 and 6, the straight line segment of the three-fold-line steel strand is close to the lower flange 2 of the steel crane beam, and the inclined line segment is approximately vertical to the development trend of the fatigue crack 18 at the variable cross section of the steel crane beam, so that when prestress is applied to the steel crane beam, the development of the fatigue crack at the variable cross section can be well inhibited, and the fatigue resistance of the variable cross section of the steel crane beam is remarkably improved.
In the invention, the bottom end of the second vertical stiffening rib 8 extends to be flush with the variable cross section of the steel crane beam or slightly lower than the variable cross section of the steel crane beam, so that the straight line segment of the three-fold steel strand is aligned with the variable cross section of the steel crane beam or slightly lower than the variable cross section of the steel crane beam, and the development of fatigue cracks at the variable cross section can be more accurately and more effectively inhibited when prestress is applied to the straight line segment of the prestress steel strand.
Furthermore, an acute angle formed between the two oblique straight line segments and the straight line segment is not more than 15 degrees, the steel strand bundle is prevented from being scattered or broken due to an excessively large bending angle, and the specification of the external prestress constraint bending angle is met.
The manufacturing method of the fatigue-resistant prestressed variable-section steel crane beam comprises the following steps of:
cutting and blanking plates required for manufacturing the variable-section steel crane beam according to a design drawing, and welding an upper flange 1, a lower flange 2 and a web 3 of the assembled steel crane beam;
welding an end plate 4 at each end of the steel crane beam, and arranging steel strand through holes 13 on the end plates 4 according to the designed positions, as shown in figure 2;
welding a plurality of first vertical stiffening ribs 7 in the span of the steel crane beam, arranging a notch 17 on the outer edge of the first vertical stiffening rib according to a design position in advance for a steel strand to pass through, welding two second vertical stiffening ribs 8 at two ends of the steel crane beam, wherein the bottom end of each second vertical stiffening rib is flush with or slightly lower than the variable cross section of the steel crane beam;
of course, the invention can also weld the longitudinal stiffening rib 6 and the local vertical stiffening rib 5 of the assembled steel crane beam according to the actual requirement, the longitudinal stiffening rib 6 is arranged along the longitudinal length of the steel crane beam, both ends are welded with the end plate 4, and the local vertical stiffening rib 5 is welded between the upper flange 1 and the longitudinal stiffening rib 6.
Welding a pitch round steel pipe 14 at the bottom end of the second vertical stiffening rib, welding stiffening ribs 15 inside the round steel pipe 14, welding two limiting plates 16 at the bottom of the round steel pipe 14, and forming a steel strand limiting groove between the two limiting plates 16 for a steel strand to pass through;
an anchor plate 11 is arranged on the outer side surface of the end plate 4, the anchor plate 11 is wedge-shaped, the outer surface of the anchor plate 11 is perpendicular to the steel strand, an anchor hole is formed in the center of the anchor plate 11, two anchor plate stiffening plates 12 are arranged on the inner side surface of the end plate 4 in a direction parallel to the steel strand, and the anchor plate stiffening plates 12 are welded with the end plate 4 and the web plate 3; the anchoring ends are anchored on the end plates at two ends of the steel crane beam, effective reinforcement measures are further taken for the end plates, and the newly-built steel crane beam has firm stress points and enough operation space, so that the problems that the traditional reinforcement measures have no reliable stress points and the operation space is limited and the construction is inconvenient are solved.
The steel strand 9 penetrates through an anchor hole of the anchor plate 11, the steel strand 9 bypasses the round steel tube 14 from the steel strand limiting groove and penetrates through the notch 17, two ends of the steel strand are anchored on the anchor plate by using the anchorage device 10, prestress with design requirements is applied by tensioning two ends, and the manufacturing of the anti-fatigue prestress variable-section steel crane beam is completed.
By the manufacturing method, the prestress technology is applied to newly-built variable cross-section steel crane beams, and the method is applicable to the reinforcement of the currently common right-angle abrupt-change type steel crane beams, trapezoidal transition type steel crane beams and circular arc transition type steel crane beams, as shown in figures 1, 5 and 6. The method has the advantages that the fatigue problem is considered in advance in the manufacturing stage of the beam, the reinforcement measure is taken after the fatigue crack appears in the later stage, the structure of the steel crane beam is hardly changed, the dead weight of the original structure is hardly increased, the construction is simple and convenient, the method is economical and reliable, the arrangement and the trend of the steel strand fully consider the integral shape of the variable-section steel crane beam and the appearance position and the development trend of the fatigue crack, the development of the fatigue crack at the variable section of the variable-section steel crane beam can be well inhibited on the premise of ensuring that the three-fold steel strand can be effectively and reliably tensioned and stressed, the fatigue resistance of the variable-section steel crane beam at the variable section is greatly improved, the defects of a reinforcement structure in the prior art are overcome, the fatigue failure resistance of the structure is improved, and the durability of the structure is enhanced.
Thus, it should be understood by those skilled in the art that while exemplary embodiments of the present invention have been illustrated and described in detail herein, many other variations and modifications can be made, which are consistent with the principles of the invention, from the disclosure herein, without departing from the spirit and scope of the invention. Accordingly, the scope of the invention should be understood and interpreted to cover all such other variations or modifications.
Claims (4)
1. The utility model provides an antifatigue prestressing force variable cross section steel crane roof beam which characterized in that: comprises an upper flange, a lower flange, a web plate, an end plate, anchoring ends, a steering gear, a prestressed steel strand and an anchorage device which are symmetrically arranged at two sides of the web plate,
the steel crane beam is also provided with vertical stiffening ribs, the vertical stiffening ribs are vertically welded and fixed with the upper flange and the web plate and comprise a plurality of first vertical stiffening ribs positioned in the span of the steel crane beam and two second vertical stiffening ribs positioned at two ends of the steel crane beam, the length of each second vertical stiffening rib is smaller than that of each first vertical stiffening rib, and the bottom end of each second vertical stiffening rib extends to be flush with the variable cross section of the steel crane beam or to be slightly lower than the variable cross section of the steel crane beam;
steel strand through holes are formed in the end plates at the two ends of the steel crane beam in advance according to the designed positions;
the anchoring end is welded at the through hole of the steel strand on the end plates at two ends and anchored at the outer side of the end plate, the anchoring end is composed of an anchor plate and two anchor plate stiffening plates, the anchor plate is provided with an anchor hole, the anchor plate is arranged at the outer side surfaces of the end plates at two ends of the steel crane beam, and the two anchor plate stiffening plates are welded on the inner side surfaces of the end plates and the web plate, are arranged at two sides of the steel strand and are parallel to the steel strand;
the two steering gears are respectively fixed at the bottom end of one second vertical stiffening rib;
the steel strand bypasses the steering gear, two ends of the steel strand penetrate through the steel strand through hole and are anchored at the anchoring end through an anchorage device, the trend of the steel strand is generally consistent with the shape of the variable cross section of the steel crane beam, a three-fold-line steel strand comprising a straight line section and two inclined line sections is formed, the straight line section corresponds to the variable cross section of the steel crane beam or is slightly lower than the variable cross section of the steel crane beam, and the fatigue crack development trend of the inclined line sections and the variable cross section of the steel crane beam is approximately vertical;
the steering gear is made of a section of round steel pipe, the round steel pipe is perpendicular to the web plate and is installed at the bottom end of the second vertical stiffening rib, and the round steel pipe is welded and fixed with the web plate and the bottom end of the second vertical stiffening rib;
a stiffening rib is vertically welded in the round steel pipe, and the stiffening rib and the second vertical stiffening rib are positioned in the same plane;
and a limiting plate is welded on each of two sides of the steel strand on the circular steel tube, a limiting groove is formed between the two limiting plates, and the steel strand bypasses the circular steel tube from the limiting groove.
2. The fatigue-resistant prestressed variable-cross-section steel crane beam as claimed in claim 1, wherein:
and the edge of the first vertical stiffening rib is provided with a notch corresponding to the position of the steel strand for the steel strand to pass through.
3. The fatigue-resistant prestressed variable-cross-section steel crane beam as claimed in claim 1, wherein:
the included acute angle between the two oblique straight line segments and the straight line segment is not more than 15 degrees.
4. A method of manufacturing a fatigue resistant prestressed variable cross-section steel crane beam according to any one of claims 1 to 3, characterized by comprising the steps of:
cutting and blanking plates required for manufacturing the variable-section steel crane beam according to a design drawing, and welding and assembling an upper flange, a lower flange and a web plate of the steel crane beam;
welding end plates at two ends of the steel crane beam respectively, and arranging steel strand through holes on the end plates according to the designed positions;
welding a plurality of first vertical stiffening ribs in the span of the steel crane beam, forming an opening at the outer edge of each first vertical stiffening rib according to a design position for a steel strand to pass through, welding two second vertical stiffening ribs at two ends of the steel crane beam, wherein the bottom ends of the second vertical stiffening ribs are flush with or slightly lower than the variable cross section of the steel crane beam;
welding a pitch of round steel pipe at the bottom end of the second vertical stiffening rib, welding the stiffening rib inside the round steel pipe, and welding two limiting plates at the bottom of the round steel pipe, wherein a steel strand limiting groove is formed between the two limiting plates for a steel strand to pass through;
arranging an anchor plate on the outer side surface of the end plate, wherein the outer surface of the anchor plate is vertical to the steel strand, an anchor hole is formed in the center of the anchor plate, two anchor plate stiffening plates are arranged on the inner side surface of the end plate in a direction parallel to the steel strand, and the anchor plate stiffening plates are welded with the end plate and the web plate;
and the steel strand penetrates through the anchor hole of the anchor plate, bypasses the round steel tube and passes through the opening, anchors the two ends of the steel strand on the anchor plate by using an anchorage device, applies prestress with design requirements by stretching and drawing the two ends, and completes the manufacture of the anti-fatigue prestress variable-section steel crane beam.
Priority Applications (1)
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