CN209452538U - A kind of girder pre-stressed means for correcting of box - Google Patents
A kind of girder pre-stressed means for correcting of box Download PDFInfo
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- CN209452538U CN209452538U CN201821959370.8U CN201821959370U CN209452538U CN 209452538 U CN209452538 U CN 209452538U CN 201821959370 U CN201821959370 U CN 201821959370U CN 209452538 U CN209452538 U CN 209452538U
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- pull rod
- girder
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- box
- support frame
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Abstract
The embodiments of the present invention disclose a kind of girder pre-stressed means for correcting of box, the girder pre-stressed means for correcting of the box, including a pair of supporting and pull rod, a pair of of support frame as described above is arranged in box beam two sides of the bottom, and the both ends of the pull rod are connected to a pair of of support frame as described above；Wherein, support frame as described above includes bottom plate and vertical plate, and the vertical plate is vertically connected at the bottom plate side, makes the section of support frame as described above in 7 fonts, and the bottom plate fits in the box beam bottom by work nut, is provided with through-hole on the vertical plate；Wherein, the both ends of the pull rod are provided with screw thread, and the both ends of the pull rod pass through the through-hole, are fixedly connected on the vertical plate by nut.The girder pre-stressed means for correcting of box can correct girder, and camber is generally relatively stable after correction, and intensity, the rigidity of girder are reinforced, the girder pre-stressed means for correcting of the box that calibration cycle is shorter, effect is good.
Description
Technical field
The utility model relates to crane alignment technique fields, and in particular to a kind of girder pre-stressed means for correcting of box.
Background technique
Bridge crane in the long-term use, due to manufacture, use and ordinary maintenance, maintaining method it is a variety of because
The influence of element will lead to girder bending-down, deviate design arch value, when girder being caused to be permanently deformed, bridge crane is small
Running resistance increase is walked by garage, and causes girder lower cover plate and phenomena such as neighbouring web is cracked, desoldering, can not be just
It is often used, eventually leads to and scrap.Traditional handicraft passes through flame correction girder, flame correction method principle are as follows: utilizes metallized thermoplastic
Principle is heated in girder lower cover plate and web regional area with flame, and the permanent deformation to arch upward upwards is generated when cooling meat, is reached
To the purpose of correction girder bending-down.Flame correction method operating procedure is complex, is difficult to control the degree of arch, remaining after correction
Stress is larger, and service performance is unreliable, still there is the possibility of downwarp again.
Therefore, it is necessary to develop the technical requirements of a kind of couple of construction personnel are not high, camber is generally relatively stable after correction, main
Intensity, the rigidity of beam are reinforced, the girder pre-stressed means for correcting of the box that calibration cycle is shorter, effect is good.
Utility model content
To solve the above-mentioned problems in the prior art, the utility model provides a kind of girder pre-stressed correction dress of box
It sets, including a pair of supporting and pull rod, a pair of of support frame as described above setting is distinguished at box beam two sides of the bottom, the both ends of the pull rod
It is connected to a pair of of support frame as described above；
Wherein, support frame as described above includes bottom plate and vertical plate, and the vertical plate is vertically connected at the bottom plate side, makes the branch
The section of support is in 7 fonts, and the bottom plate fits in the box beam bottom by work nut, is provided on the vertical plate logical
Hole；
Wherein, the both ends of the pull rod are provided with screw thread, and the both ends of the pull rod pass through the through-hole, fixed by nut
It is connected to the vertical plate.
Optionally, further include gusset, the gusset be it is multiple, multiple gusset spaced set one end are vertically connected at
The vertical plate, side are vertically connected at the bottom plate, and the vertical plate is divided into multiple tension sections, each tension section
On be provided with the through-hole.
Optionally, the pull rod is multiple, the quantity of the through-hole in the quantity of the pull rod and single support frame as described above
It matches.
Optionally, each middle part for tensing section, the distance between adjacent through-holes and adjacent webs are arranged in the through-hole
The distance between it is equal.
It optionally, further include supporting plate, the supporting plate is tabular, has been located at multiple second through-holes on the supporting plate, described
One end of supporting plate is connected to the box beam bottom, is located between two support frames, and it is logical that multiple pull rods pass through described second
Hole.
Optionally, support frame as described above is welded by bottom plate, vertical plate and multiple gussets using one-side-filled angle weld.
Optionally, the width of the bottom plate is greater than the width of the girder of the box beam, and the thickness of the bottom plate is greater than etc.
In the thickness of the lower cover plate of the girder.
Optionally, the pull rod has lead screw to weld with round steel pull rod group, and the lead screw docks place with the round steel pull rod
It is welded with casing, processes plug welding hole in described sleeve pipe.
Optionally, the nut of the fixed pull rod includes fixture nut and stop nut, is respectively arranged at the vertical plate two
Side, selection are identical as the selection of the lead screw.
Optionally, the axis direction of the pull rod is parallel to the axis direction of the box beam.
The utility model has the beneficial effects that: support frame is arranged in box beam by the setting of support frame and pull rod
Two sides of the bottom, pull rod are fixedly connected on two support frames, and pull rod applies stress, this stress and working stress it is contrary,
Part working stress is offset, achievees the purpose that girder is bent upwards recovery arch.
Detailed description of the invention
Fig. 1 is a kind of structural schematic diagram of the embodiment of the girder pre-stressed means for correcting of box of the utility model.
Fig. 2 is a kind of structural schematic diagram of the support frame embodiment of the girder pre-stressed means for correcting of box of the utility model.
Fig. 3 is a kind of use state diagram of the embodiment of the girder pre-stressed means for correcting of box of the utility model.
Fig. 4 is a kind of construction behaviour of the priestesses rectification method of the embodiment of the girder pre-stressed means for correcting of box of the utility model
Make programme diagram.
Wherein:
1- support frame, 2- pull rod, 3- bottom plate, 4- vertical plate, 5- gusset, 6- through-hole, 7- lead screw, 8- round steel pull rod, 9- are fixed
Nut, 10- stop nut；11, bracket.
Specific embodiment
Preferred embodiments of the present invention are described in more detail below.Although the following describe the utility model
Preferred embodiment, however, it is to be appreciated that may be realized in various forms the utility model without the implementation that should be illustrated here
Mode is limited.On the contrary, thesing embodiments are provided so that the utility model is more thorough and complete, and can be by this
The range of utility model is completely communicated to those skilled in the art.
The utility model provides a kind of girder pre-stressed means for correcting of box, which is characterized in that the box is girder pre-stressed
Means for correcting includes a pair of supporting and pull rod, and a pair of of support frame as described above setting is in box beam two sides of the bottom, and the two of the pull rod
End is connected to a pair of of support frame as described above；
Wherein, support frame as described above includes bottom plate and vertical plate, and the vertical plate is vertically connected at the bottom plate side, makes the branch
The section of support is in 7 fonts, and the bottom plate fits in the box beam bottom by work nut, is provided on the vertical plate logical
Hole；
Wherein, the both ends of the pull rod are provided with screw thread, and the both ends of the pull rod pass through the through-hole, fixed by nut
It is connected to the vertical plate.
Specifically, it burn-ons two support frames when use in the lower cover board ends of box beam, then 2 perforating branches support of pull rod,
Nut is tightened, makes pull rod by tensioning, girder eccentric compression makes girder arch upward upwards, to reach under correction crane girder
Scratch the purpose for restoring arch.
Further, further include gusset, the gusset be it is multiple, multiple gusset spaced set one end vertically connect
In the vertical plate, side is vertically connected at the bottom plate, and the vertical plate is divided into multiple tension sections, each tension area
Between on be provided with the through-hole.
Specifically, the mechanical strength of support frame is improved by the setting of multiple gussets.
Further, the pull rod is multiple, the number of the through-hole in the quantity of the pull rod and single support frame as described above
Amount matches.
Specifically, apply stress by multiple pull rods and restore arch convenient for girder.
Further, each middle part for tensing section, the distance between adjacent through-holes and adjacent muscle is arranged in the through-hole
The distance between plate is equal.
It is highly preferred that further including supporting plate, the supporting plate is tabular, has been located at multiple second through-holes, institute on the supporting plate
The one end for stating supporting plate is connected to the box beam bottom, is located between two support frames, and multiple pull rods pass through described second
Through-hole.
Further, the distance between adjacent webs are not less than 80mm.
Further, support frame as described above is welded by bottom plate, vertical plate and multiple gussets using one-side-filled angle weld.
Further, the width of the bottom plate is greater than the width of the girder of the box beam, and the thickness of the bottom plate is greater than
Equal to the thickness of the lower cover plate of the girder.
Further, the pull rod has lead screw to weld with round steel pull rod group, and the lead screw is docked with the round steel pull rod
Place is welded with casing, processes plug welding hole in described sleeve pipe.
Further, the nut of the fixed pull rod includes fixture nut and stop nut, is respectively arranged at the vertical plate
Two sides, selection are identical as the selection of the lead screw.
Further, the axis direction of the pull rod is parallel to the axis direction of the box beam.
Technical solutions of the utility model are discussed in detail with reference to the accompanying drawing.
Embodiment 1
Fig. 1 is a kind of structural schematic diagram of the embodiment of the girder pre-stressed means for correcting of box of the utility model.Fig. 2 is this reality
With a kind of novel structural schematic diagram of the support frame embodiment of the girder pre-stressed means for correcting of box.Fig. 3 is the utility model one kind
The use state diagram of the embodiment of the girder pre-stressed means for correcting of box.Fig. 4 is that a kind of box of the utility model is girder pre-stressed
The constructing operation programme diagram of the priestesses rectification method of the embodiment of means for correcting.
As Figure 1-Figure 4, by taking certain work area project as an example:
One, project background
(model is respectively as follows: QD-30/5-22.5, QD-30/5-22.5, QD- to 5 bridge cranes belonging to machining center
15/3-22.5, QD-5-16.5, QD-15/3-16.5) since year limit for length, frequency of use are high, lead to ageing equipment, each component mill
Damage is serious, occur large and small garage walk to gnaw rail, the long-term oil leak of trolley size hook reduction gearbox especially cart girder torsional deformation,
The problems such as without camber, meets machining center and normally produces to guarantee the safe handling of bridge machine, now plans first to 2 30
Ton bridge main beam carries out the correction process of downwarp prestressing force using the girder pre-stressed means for correcting of box.
According to conditions such as the intensity of girder and Static stiffness, economic depth of beam and self weight are determined, the quiet height condition of girder is
Disregard the movement of dynamic load factor elliptical gear coefficient, load girder maximum static deflection caused by girder span centre is no more than allowable
Natural bow, i.e.,；F < [f]=L/ [B] disregards the mobile load of the girder receiving of dynamic load factor and elliptical gear coefficient；R=n/2
(Q+G is small) according to decision is briefly discussed above using most scientific prestressing method progress correction process girder bending-down, this method is to pass through
Stretch-draw prestressing force pull rod is bent upwards girder, achievees the purpose that scratch in recovery.Because prestressed draw-bar has reinforcement effect to girder,
Therefore also known as prestressed reinforcement.
Bridging crane main beam downwarp not only craft science, easy for construction is repaired with electrothermal prestressing, but also can be accurate, reliable
Arch amount needed for ground obtains, the arch value after repairing is also compared with the stabilization of other methods reparation, the crane repaired through electrothermal prestressing,
Its girder strength and stiffness is reinforced.
Two, prestressing force means for correcting basic principle:
Electrothermal prestressing is exactly that girder is made to restore arch, principle, when girder zero load, prestressed draw-bar with prestressed draw-bar
Tensioning, it is e to the arm of force of neutral axis that longitudinal eccentricity pressure N, N a power is thus added under girder neutral axis, so acting on
Torque on girder is M=Ne.Under the action of this torque, girder restores arch.
Under the action of deformed bar, girder existing stress, i.e. prestressing force in zero load, upper cover plate tension stress,
Lower cover plate compression chord.When girder load, working stress is just opposite with prestressing force.Prestressing force can offset part in this way
Working stress also just offsets the downwarp that a part is generated due to goods weight.
This processing method is the triangularity force structure that band adds pull rod 2, is equal to girder lifting capacity and upgrades and improve
The intensity of rule beam is held, mechanical strength is increased, girder bearing capacity is reinforced automatically.The shearing resistance stiffness of structure is also improved simultaneously.
Additional pull rod 2 and support frame 1, form a space structure, and when 2 internal force of pull rod is simplified to planar structure power, i.e., support frame is more
A force becomes uniform plane stress, to play the carrying tension strength of whole structure entirety, entire girder is made to become one
Phenomena such as a statically determinate system, elimination deformation as caused by weighing items, trolley side direction horizontal thrust.It is run in cart skew
When, the stress of prestressed structure system is also relatively more clear.
Priestesses rectification method corrects downwarp, is to burn-on two support frames 1 in the lower cover board ends of girder, then several
The screwed pull rod 2 in both ends passes through support frame 1, tightens nut, makes pull rod 2 by tensioning, girder eccentric compression, make girder to
On arch upward, to achieve the purpose that correcting crane girder downwarp restores arch, use state is as shown in Figure 3.
Three, prestressing force verifying unit design process
(1) design of support frame 1
The structure of support frame 1 is welded by bottom plate 3, vertical plate 4 and multiple gussets 5.Using one-side-filled angle weld, bottom plate 3 and vertical plate 4
Outside require it is smooth, to guarantee that support frame 1 is adjacent to girder lower cover plate and work nut.The width of the bottom plate 3 of support frame 1 should omit
It is wider than the width of girder lower cover plate, the thickness of bottom plate 3 can be equal with girder lower cover plate, the thickness of weld bead height approximation plate.Vertical plate 4
It is generally thicker for main stressed member, distance between gusset 5 and 2 center of pull rod away from equal, outermost through-hole 6 to plate edge away from
From no less than 80mm.
(2) pull rod 2 designs
Pull rod 2 is welded by lead screw 7 with 8 groups of round steel pull rod, to guarantee that weld strength is welded with casing, and casing at docking
Plug welding hole is processed, finally carries out plug welding processing with pull rod 2, it is ensured that the docking intensity of pull rod 2 carries out flaw detection when necessary.It must
It must guarantee the requirement of its concentricity.Lead screw 7 is quasi- to be made of of 45# steel, to prevent its fracture or slide fastener, guarantees its processing quality and material
It is required that, it is desirable that 7 technological process of lead screw are as follows: blanking, modifier treatment, alignment, tempering destressing, machining, the setting of pull rod 7
Single-row arrangement, arrangement are symmetrical with the vertical axis of girder, and arrangement width is no more than the width of girder.
(3) bracket 11 designs
Bracket 11 is in order to prevent or to reduce the trembling of pull rod 2 in crane operational process and be arranged, bracket 2 and lower cover
Plate welding.
(4) nut designs
The nut of pull rod 2 is divided into fixture nut 9 and stop nut 10, and fixture nut 9 is applied in advance in tensioning by tightening
Stress and anchoring rod 2 to keep prestressed long term, stress when due to 2 tension of pull rod often beyond design stress,
Therefore work nut requires thicker, and thickness 50mm is advisable, and material is identical as 7 material of lead screw, and the effect of stop nut 10 is
Prevent fixture nut 9 loosen or pull rod 2 fracture and be arranged.
Four, the constructing operation program of priestesses rectification method is shown in Fig. 4
Five, installation and adjustment
Support frame 1 is respectively arranged in the both ends of two girders with jack (at gusset), it is ensured that on the vertical plate 4 of two support frames 1
The concentricity of through-hole 6, and it is made to be tightly attached to firm welding on the bottom plate of girder (bottom plate bevel in rear end when welding), it then will be pre-
Stress pull rod 2 is respectively arranged on support frame 1, carries out tightening nut in order one by one according to measurement result.First by an end nut
It all screws on, then arrives other end tightening nut.Each nut should be tightened by several times one by one, cannot once tighten in place.Often twist one time
The changing value that Main Girder Deflection should all be measured when nut, until arch meets the requirement of repair specification.This time 30/5T of maintenance
Bridge owner's beam span be 22.5 meters, according to bridge crane design specification and design drawing provide its girder camber be >=
22.5mm, the girder after providing the bridge machine overhauling herein encircle in advance as 25mm.
Six, compared with conventional correction method
Flame correction method principle: added using metallized thermoplastic principle in girder lower cover plate and web regional area flame
Heat generates the permanent deformation to arch upward upwards when cooling meat, achievees the purpose that correct girder bending-down.
Prestressing force correction method principle: making girder before bearing load, and pre- pretensioning pull rod applies stress, this is answered
Contrary, the counteracting part working stress of power and working stress, achievees the purpose that girder is bent upwards recovery arch.
Flame correction method operating procedure is complex, is difficult to control the degree of arch, and residual stress is larger after correction, uses
Performance is unreliable, still there is the possibility of downwarp again, and prestressing force correction method is easy to control the degree scratched on girder, to construction personnel
Technical requirements it is not high, camber is generally relatively stable after correction, and intensity, the rigidity of girder are reinforced, calibration cycle compared with
It is short, effect is good.
Finally, it should be noted that the above descriptions are merely preferred embodiments of the present invention, it is not limited to this
Utility model, although the utility model is described in detail with reference to the foregoing embodiments, for those skilled in the art
For, it is still possible to modify the technical solutions described in the foregoing embodiments, or to part of technical characteristic
It is equivalently replaced.Within the spirit and principle of the utility model, any modification, equivalent replacement, improvement and so on,
It should be included within the scope of protection of this utility model.
Claims (10)
1. a kind of girder pre-stressed means for correcting of box, which is characterized in that the girder pre-stressed means for correcting of box includes a pair of of branch
Support and pull rod, a pair of of support frame as described above are arranged in box beam two sides of the bottom, and the both ends of the pull rod are connected to a pair of of institute
State support frame；
Wherein, support frame as described above includes bottom plate and vertical plate, and the vertical plate is vertically connected at the bottom plate side, makes support frame as described above
Section be in 7 fonts, the bottom plate fits in the box beam bottom by work nut, is provided with through-hole on the vertical plate；
Wherein, the both ends of the pull rod are provided with screw thread, and the both ends of the pull rod pass through the through-hole, are fixedly connected by nut
In the vertical plate.
2. the girder pre-stressed means for correcting of a kind of box according to claim 1, which is characterized in that it further include gusset, it is described
Gusset be it is multiple, multiple gusset spaced set one end are vertically connected at the vertical plate, and side is vertically connected at the bottom
The vertical plate is divided into multiple tension sections, is provided with the through-hole on each tension section by plate.
3. the girder pre-stressed means for correcting of a kind of box according to claim 2, which is characterized in that the pull rod be it is multiple,
The cooperating number of the through-hole closes in the quantity of the pull rod and single support frame as described above.
4. the girder pre-stressed means for correcting of a kind of box according to claim 2, which is characterized in that the through-hole is arranged every
A middle part for tensing section, the distance between adjacent through-holes are equal with the distance between adjacent webs.
5. the girder pre-stressed means for correcting of a kind of box according to claim 3, which is characterized in that it further include supporting plate, it is described
Supporting plate is tabular, and multiple second through-holes have been located on the supporting plate, and one end of the supporting plate is connected to the box beam bottom,
Between two support frames, multiple pull rods pass through second through-hole.
6. the girder pre-stressed means for correcting of a kind of box according to claim 2, which is characterized in that support frame as described above is the bottom of by
Plate, vertical plate and multiple gussets are welded using one-side-filled angle weld.
7. the girder pre-stressed means for correcting of a kind of box according to claim 1, which is characterized in that the width of the bottom plate is big
In the width of the girder of the box beam, the thickness of the bottom plate is more than or equal to the thickness of the lower cover plate of the girder.
8. the girder pre-stressed means for correcting of a kind of box according to claim 1, which is characterized in that the pull rod have lead screw with
Round steel pull rod group is welded, and the lead screw is welded with casing with the round steel pull rod place of docking, processes plug welding hole in described sleeve pipe.
9. the girder pre-stressed means for correcting of a kind of box according to claim 8, which is characterized in that the spiral shell of the fixed pull rod
Main bag includes fixture nut and stop nut, is respectively arranged at the vertical plate two sides, and selection is identical as the selection of the lead screw.
10. the girder pre-stressed means for correcting of a kind of box according to claim 1, which is characterized in that the axis of the pull rod
It is oriented parallel to the axis direction of the box beam.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821959370.8U CN209452538U (en) | 2018-11-27 | 2018-11-27 | A kind of girder pre-stressed means for correcting of box |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821959370.8U CN209452538U (en) | 2018-11-27 | 2018-11-27 | A kind of girder pre-stressed means for correcting of box |
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| CN209452538U true CN209452538U (en) | 2019-10-01 |
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ID=68039170
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114523028A (en) * | 2022-01-26 | 2022-05-24 | 苏州市越海拉伸机械有限公司 | Multi-head stretching device and stress relief stretcher using same |
-
2018
- 2018-11-27 CN CN201821959370.8U patent/CN209452538U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114523028A (en) * | 2022-01-26 | 2022-05-24 | 苏州市越海拉伸机械有限公司 | Multi-head stretching device and stress relief stretcher using same |
| CN114523028B (en) * | 2022-01-26 | 2023-04-25 | 苏州市越海拉伸机械有限公司 | Multi-head stretching device and stress relieving stretching machine using same |
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