CN102530721B - Anti-typhoon method for portal crane and special equipment thereof - Google Patents

Anti-typhoon method for portal crane and special equipment thereof Download PDF

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Publication number
CN102530721B
CN102530721B CN201010598524.7A CN201010598524A CN102530721B CN 102530721 B CN102530721 B CN 102530721B CN 201010598524 A CN201010598524 A CN 201010598524A CN 102530721 B CN102530721 B CN 102530721B
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China
Prior art keywords
earth anchor
transfer crane
sides
leg
cable wind
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CN102530721A (en
Inventor
刘勇
谢为金
吴懿
张诗清
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Guangdong Power Engineering Corp
GUANGDONG LIFT ENGINEERING MACHINERY Co Ltd
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Guangdong Power Engineering Corp
GUANGDONG LIFT ENGINEERING MACHINERY Co Ltd
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Abstract

The invention mainly relates to an anti-typhoon method for a portal crane and a special equipment thereof. The method is characterized by comprising: 1) collecting local typhoon data and forecast information and making a specific solution; 2) running the stopped portal crane to a preset position before a typhoon comes; 3) laying ground anchors and cable wind ropes; and 4) fixing a hook. According to the special device, ground anchors are arranged in rigid leg foundation pits of the rigid legs and flexible leg foundation pigs of the flexible legs of the portal crane, each ground anchor has a cable wind interface reserved on the ground; symmetric cable wind ropes are arranged on the front and back sides of the rigid legs and the front and back sides of the flexible legs of the portal crane; and an iron boots and ejecting wheels are placed under the big running wheels of the portal crane. According to the analysis on loads on different portal cranes under different wind scales, specific protective measures are adopted, the overturning moment of the portal crane is reduced, related protective main points are defined, and the equipment can resist grade 11 or above typhoons.

Description

A kind of typhoon protection method of transfer crane and special purpose device
Technical field:
The present invention relates generally to a kind of typhoon protection method and special purpose device of transfer crane, protects the needs of large-scale typhoon for coastland transfer crane (being also called for short gantry overhang-door).Belong to crane safety technical field.
Background technology:
Gantry crane for general use is made up of keystone configurations such as crane span structure, supporting leg, large treadmill cars, and being also gauntry crane, is that the building sites such as municipal administration, harbour, power plant use elevator machinery frequently, and its operating efficiency is high, and cost is low.Crane bridge height is many, and at 10 ~ 30m etc. contrast with the hoisting crane of other type, transfer crane is not top-heavy, and wind area is large, poor stability, and when coastal outdoor work, typhoon protection measure requires strict.
In recent years, coastland frequently suffers large-scale typhoon, as the typhoons of 2008 " black square ratio " cause the transfer crane overthrow accident of multiple thermal power plants construction site.In existing transfer crane typhoon protection technical measures, most construction enterprises adopt the wind protection that skate is joined by manufacturer, rail clamping device adds Windproof inhaul cable, prevent transfer crane from damaging and tumbling.In actual mechanical process, owing to lacking calculating to transfer crane wind load and wind protection wind loading rating, for the size judgment bias of wind-force, cause typhoon protection measure to be lost efficacy, strong wind blows down transfer crane, causes damage to production and construction.Through verification, standard GB/T/T14406-1993 " gantry crane for general use " regulation hoisting crane off working state maximum wind pressure is not more than 800Pa(and is equivalent to hurricane speed), manufacturer's wind protection need only meet 11 grades with the requirement of shelter of apparatus for lower wind, just meets standard.For the typhoon of more than 11 grades wind-force, the wind protection of producer is often inoperative, cause fixing rail clamping device to be pulled off, track stretch bending, or steel rope is pulled off.Therefore, in coastal typhoon prone areas, single typhoon protection measure can not meet the demands.More comprehensively, comprehensive typhoon protection method has been very necessary.
Summary of the invention:
First object of the present invention is that stirrup strap, rail clamping device, Windproof inhaul cable can not meet the requirement of shelter of more than 11 grades wind-force, provide a kind of typhoon protection method of transfer crane in order to solve in transfer crane typhoon protection technical measures of the prior art.
Second object of the present invention is the special purpose device of the typhoon protection in order to provide a kind of transfer crane.
The first object of the present invention can reach by taking following technical scheme:
A typhoon protection method for transfer crane, is characterized in that comprising the following steps:
1) collect local typhoon data and forecast information, formulate scheme targetedly;
2) before typhoon 12 ~ 48 hours, desired location of being walked to by the transfer crane stopped operation, cut off working power, clamps rail, place stirrup strap, withstand wheel under the large running wheel in side, front and back of transfer crane with rail clamping device.
3) earth anchor and cable wind rope is arranged:
First, before and after the rigid leg of transfer crane, before and after the foundation ditch of both sides, flexible leg, the foundation ditch of both sides respectively arranges at least one group of earth anchor be arranged symmetrically with, or reserved casting concrete anchor point, each earth anchor place Cast-in-situ Piles in Sand-filling soil pressure is real, is respectively reserved with one or two guy interface on ground;
Then, before and after the rigid leg of transfer crane, before and after both sides, flexible leg, both sides respectively arrange at least one pair of cable wind rope be arranged symmetrically with, at angle, one end and earth anchor or the anchor point of described cable wind rope are reserved in that ground guy interface is fixedly connected with, the joint of truss of its other end and transfer crane is flexible coupling for cable wind rope and portal gantry;
4) fixing suspension hook, large race is fixed on middle part or flexible leg side end, lays 1 ~ 1.5t counterweight and fix under suspension hook, and walking of trotting is fixed to the flexible leg side end position of transfer crane.
After typhoon, remove said apparatus by reverse step operation, transfer crane is place in operation again.
Detect according to practical experience, hurricane power, when the formed steel construction transfer crane of 40t/42m length is by front high wind, the wind load that crane span structure produces is up to 10.44t, and rigid leg produces the power of 2.55t.Wind load when more than 12 grades is larger, and the device that producer provides can not meet the requirement of typhoon protection.The present invention is combined by the pre-buried earth anchor of design and guy, and opposing front and oblique various wind loads, be combined as the method for main cooperation stirrup strap, rail clamping device with guy.
First object of the present invention can also reach by taking following technical scheme:
A kind of embodiment realizing the present invention first object is: the method for arranging for transfer crane earth anchor and cable wind rope is as follows:
1) when transfer crane is positioned at 11 grades ~ 13 grades wind-force central areas and be subject to front attack, before and after the rigid leg of transfer crane, bilateral symmetry buries one group of small dimension earth anchor (being called for short little earth anchor) underground, before and after its flexible leg, bilateral symmetry buries one group of little earth anchor underground; Earth anchor is actual according to place, can be arranged on outside solid line position, also can be arranged on inner side dotted line position, earth anchor and door frame angled.Each earth anchor is respectively reserved with a guy interface on ground; Before and after the rigid leg of transfer crane, both sides arrange a pair cable wind rope, before and after its flexible leg, both sides arrange a pair cable wind rope;
2) when transfer crane is subject to 13 grades ~ 14 grades wind front attacks, before and after the rigid leg of transfer crane, both sides bury one group of large earth anchor underground, and before and after its flexible leg, both sides bury one group of little earth anchor underground; The one group of earth anchor being embedded in both sides before and after rigid leg is respectively reserved with two guy interfaces on ground, be embedded in one group, both sides earth anchor before and after flexible leg and be respectively reserved with a guy interface on ground; Before and after the rigid leg of transfer crane, both sides arrange two pairs of cable wind ropes, before and after its flexible leg, both sides arrange a pair cable wind rope;
3) when transfer crane is subject to 13 grades ~ 14 grades wind front attacks, before and after the rigid leg of transfer crane, both sides bury two groups of little earth anchors underground, before and after its flexible leg, both sides bury one group of little earth anchor underground; Each earth anchor is respectively reserved with a guy interface on ground; Before and after the rigid leg of transfer crane, both sides arrange two pairs of cable wind ropes, before and after its flexible leg, both sides arrange a pair cable wind rope;
4) when transfer crane is positioned at 14 grades ~ 15 grades wind-force central areas and be subject to front attack time, the layout of earth anchor and cable wind rope, is taking the above-mentioned 2nd) on the basis of arrangement form, above each earth anchor, add 3t saddle weight;
5) when transfer crane is positioned at more than 15 grades wind-force central areas and be subject to front attack time: the layout of earth anchor and cable wind rope, taking the above-mentioned 3rd) on the basis of arrangement form, above each earth anchor, add 5t saddle weight.
Second object of the present invention can reach by taking following measure:
A kind of special purpose device of typhoon protection of transfer crane, before and after the rigid leg being included in transfer crane before and after the rigid leg foundation ditch of both sides, flexible leg the flexible leg foundation ditch of both sides, earth anchor, connection earth anchor and portal gantry guy, for the rail of transfer crane walking and rail clamping device, it is characterized in that: before and after the rigid leg of transfer crane, before and after the rigid leg foundation ditch of both sides, flexible leg, the flexible leg foundation ditch of both sides respectively arranges at least one group of earth anchor be arranged symmetrically with, and each earth anchor is respectively reserved with one or two guy interface on ground; Before and after the rigid leg of transfer crane, before and after both sides, flexible leg, both sides respectively arrange at least one pair of cable wind rope be arranged symmetrically with, and one end and the earth anchor of described cable wind rope are reserved in that ground guy interface is fixedly connected with, the truss of its other end and transfer crane is flexible coupling.Under the large running wheel in side, front and back of transfer crane, place stirrup strap, withstand wheel.
The present invention can pass through the loading analysis of all kinds transfer crane under wind-force effect at different levels, safeguard procedures are targetedly proposed, reduce the tilting moment of transfer crane, clearly relevant protection main points, enable transfer crane meet more than the 11 grades typhoon requirements of opposing wind-force.
Second object of the present invention can also reach by taking following measure:
A kind of embodiment realizing the present invention second object is: the laying depth of described earth anchor is more than or equal to 1.5m, Cast-in-situ Piles in Sand-filling soil presses closely, described cable wind rope and ground angle are less than or equal to 45 °, and with the angle 70 ° ~ 80 ° of portal gantry, the predetermincd tension of cable wind rope is 0.6 ~ 0.8t.
A kind of embodiment realizing the present invention second object is: described earth anchor is embed-type cement concrete earth anchor, and its cross sectional shape is oblong or convex shape; Large earth anchor and little earth anchor is divided into according to the size of size.
A kind of embodiment realizing the present invention second object is: poured integral concrete foundation in advance, and underlying strength and anchoring device intensity meet guy force request.
A kind of embodiment realizing the present invention second object is: for transfer crane
1) before and after the rigid leg of transfer crane, bilateral symmetry buries one group of earth anchor underground, before and after its flexible leg, both sides bury one group of earth anchor underground, at outside (solid line) or can be selected in inner side (dotted line) according to place situation; Each earth anchor is respectively reserved with a guy interface on ground; Before and after the rigid leg of transfer crane, both sides arrange two pairs of cable wind ropes, before and after its flexible leg, both sides arrange a pair cable wind rope;
2) or before and after the rigid leg of transfer crane both sides bury one group of large earth anchor underground, before and after its flexible leg, both sides bury one group of earth anchor underground; The one group of earth anchor being embedded in both sides before and after rigid leg is respectively reserved with two guy interfaces on ground, be embedded in one group, both sides earth anchor before and after flexible leg and be respectively reserved with a guy interface on ground; Before and after the rigid leg of transfer crane, both sides arrange a pair cable wind rope, before and after its flexible leg, both sides arrange a pair cable wind rope;
3) or before and after the rigid leg of transfer crane both sides bury two groups of earth anchors underground, before and after its flexible leg, both sides bury one group of earth anchor underground; Each earth anchor is respectively reserved with a guy interface on ground; Before and after the rigid leg of transfer crane, both sides arrange two pairs of cable wind ropes, before and after its flexible leg, both sides arrange a pair cable wind rope;
4) or taking the 2nd) on the basis that arranges, above each earth anchor, add 3t saddle weight;
5) or taking the 3rd) on the basis that arranges, above each earth anchor, add 5t saddle weight.
The invention has the beneficial effects as follows:
1, the present invention passes through the loading analysis of all kinds transfer crane under wind-force effect at different levels, for the transfer crane magnitude of load of different model, safeguard procedures are targetedly proposed, design the combination of different grappling guy device, reduce by more than 11 grades violent typhoon load to damage transfer crane, there is provided scientific and effective guidance to the typhoon protection scheme of on-the-spot transfer crane, enable transfer crane meet more than the 11 grades typhoon requirements of opposing wind-force.
2, the special purpose device that the present invention relates to, it can pass through the loading analysis of all kinds transfer crane under wind-force effect at different levels, safeguard procedures are targetedly proposed, reduce the tilting moment of transfer crane, clearly relevant protection main points, enable transfer crane meet more than the 11 grades typhoon requirements of opposing wind-force.
Accompanying drawing illustrates:
Fig. 1 is the construction process figure adopting the invention process typhoon protection.
Fig. 2 is the structural front view of the specific embodiment of the invention 1.
Fig. 3 is the structure birds-eye view that the present invention tackles that transfer crane is positioned at 11 grades ~ 13 grades of wind-force central areas.
Fig. 4 is the structural front view that the present invention tackles that transfer crane is positioned at 13 grades ~ 14 grades of wind-force central areas.
Fig. 5 is the structure birds-eye view that the present invention tackles that transfer crane is positioned at 13 grades ~ 14 grades of wind-force central areas.
Fig. 6 is cable wind rope of the present invention and steel truss node connection diagram.
Fig. 7 is cable wind rope of the present invention and steel pipe truss nodes connection diagram.
Fig. 8 a is the front view of the large earth anchor of the specific embodiment of the invention.
Fig. 8 b is the cut-away view of the large earth anchor of the specific embodiment of the invention.
Fig. 9 a is the front view of the earth anchor of the specific embodiment of the invention.
Fig. 9 b is the cut-away view of the earth anchor of the specific embodiment of the invention.
Figure 10 is transfer crane wind load force diagram when adopting of the present invention.
Detailed description of the invention:
Specific embodiment 1:
With reference to Fig. 1, Fig. 2 and Fig. 3, the special purpose device that the present embodiment uses, the rail comprise transfer crane 1, supplying transfer crane 1 to walk and rail clamping device, place stirrup strap, withstand wheel under the large running wheel in side, front and back of transfer crane 1; Before and after the rigid leg 11 of transfer crane 1, before and after the foundation ditch of both sides, flexible leg 12, the foundation ditch of both sides respectively arranges at least one group of earth anchor be arranged symmetrically with 2, and each earth anchor 2 is respectively reserved with one or two guy interface 21 on ground; Before and after the rigid leg 11 of transfer crane 1, before and after both sides, flexible leg 12, both sides respectively arrange at least one pair of cable wind rope 3 be arranged symmetrically with, and one end and the earth anchor 2 of described cable wind rope 3 are reserved in that ground guy interface 21 is fixedly connected with, its other end is fixedly connected with the truss 13 of transfer crane 1.The laying depth of described earth anchor 2 is more than or equal to 1.5m, and described cable wind rope 3 is less than or equal to 45 degree with ground angle, and the predetermincd tension of cable wind rope 3 is 0.8 ~ 1t; Described earth anchor 2 is embed-type cement concrete earth anchor, and its cross sectional shape is oblong or convex shape; Large earth anchor and little earth anchor is divided into according to the size of size.Described cable wind rope 3 is connected with the joint of truss 13 of steel pipe transfer crane 1 by gunnysack 5, rubber 6; Or described cable wind rope 3 is connected with the joint of truss 13 of shaped steel transfer crane 1 by sleeper 7.
The present embodiment relates to a kind of typhoon protection method of transfer crane 1, comprises the following steps:
1) typhoon data, forecast information is collected; Determine windproof scheme, organization; Prepare windproof goods and materials, instrument;
2) before typhoon 12 ~ 48 hours, transfer crane 1 stopped operation, and walking, to desired location, is cut off the electricity supply, clamped rail with rail clamping device, place stirrup strap, withstand wheel under the large running wheel in side, front and back;
3) layout of earth anchor 2 and cable wind rope 3: before and after the rigid leg 11 of transfer crane 1 both sides foundation ditch in be embedded with one group of earth anchor arranged symmetrically 2, before and after the flexible leg 12 of transfer crane 1 both sides foundation ditch in be embedded with one group of earth anchor arranged symmetrically 2; Each earth anchor 2 is all reserved with a guy interface 21 on ground; Corresponding with it, before and after the rigid leg 11 of transfer crane 1, both sides are provided with the cable wind rope 3 that at least one pair of is arranged symmetrically, and before and after the flexible leg 12 of transfer crane 1, both sides are provided with the cable wind rope 3 that at least one pair of is arranged symmetrically; One end and the earth anchor 2 of cable wind rope 3 are reserved in that ground guy interface 21 is fixedly connected with, its other end is fixedly connected with the truss 13 of transfer crane 1;
A, guy arrangement requirement: cable wind rope 3 must not be greater than 45 ° with the angle on ground, and be 70 ° ~ 80 ° with portal gantry angle, cable wind rope 3 is arranged symmetrically with, and predetermincd tension is equal; Transfer crane crane span structure joint of truss, according to the concrete shape of Steel Tube Joint or section bar node, must adopt the good cornerite point of corresponding binding method pad;
When b, fixed gantry crane, after chain block pretension cable wind rope 3, install steel rope protection additional;
C, steel cord ends rope clamp connect, and U-shaped annulus place must be installed on end first side during installing rope clamp; Each rope clamp all should be screwed to certain degree, wirerope diameter is flattened about 1/3 and is advisable.Ф 20 and Ф 22 steel rope must not be less than four rope clamps, spacing 120 ~ 140mm;
The safety distance of d, cable wind rope 3 and overhead transmission line and other charged body must not be less than the regulation of following table one.
The safety distance of table one door type hoisting crane and charged body
4) suspension hook is fixed: large race is fixed on middle part or flexible leg 12 side end, lays 1t counterweight and fix under suspension hook, and walking of trotting is fixed to the flexible leg 12 side end position of transfer crane.
5), after typhoon, wind-proof device is removed, transfer crane 1 place in operation again.
In the present embodiment:
In step 3), the laying depth of described earth anchor 2 must not be less than 1.5m, and earth anchor 2 is buried underground should be smooth, and foundation ditch must not ponding, and sand is fastening tamps in backfill, answers detailed inspection after burying underground.Often have the place of violent typhoon, according to force-bearing situation and the soil property situation of scale of wind force, earth anchor 2, earth anchor 2 laying depth exceedes computing value, and underlying strength strengthens.Described cable wind rope 3 must not be greater than 45 degree, predetermincd tension 0.6 ~ 0.8t with ground angle;
With reference to Fig. 8 a, Fig. 8 b, in step 3), described earth anchor 2 is embed-type cement concrete earth anchor 2, and its cross sectional shape is convex shape; Large earth anchor and little earth anchor is divided into according to the size of size.The size of large earth anchor is: the long 1000mm of end face, the long 2500mm in bottom surface, the wide 1800mm of end face, the wide 1800mm in bottom surface, high 600mm, Fig. 9 a, 9b, for the little earth anchor of square, size is: the long 1000mm of end face, the long 2000mm in bottom surface, the wide 1200mm of end face, the wide 1200mm in bottom surface, high 600mm.When same track there being more than two transfer cranes, earth anchor 2 guy 3 can be arranged symmetrically with, necessary pre-buried large earth anchor 2 between hoisting crane.
With reference to Fig. 3, in step 3), described transfer crane 1 can be steel-tube construction transfer crane, profile structure transfer crane, box-beam structure transfer crane; Described cable wind rope 3 is connected with the joint of truss 13 of steel pipe transfer crane 1 by gunnysack 5, rubber 6.Or described cable wind rope is connected with profile structure transfer crane 1 joint of truss 13 by sleeper, gunnysack.
The present embodiment feature is: described transfer crane 1 is the transfer crane 1 of 40t/42m, and the layout of earth anchor 2 and cable wind rope 3 comprises following several form:
1) with reference to Fig. 3, when transfer crane be positioned at 11 grades ~ 13 grades wind-force central areas and be subject to front attack time, adopt the first arrangement form: earth anchor 2 quantity that earth anchor 2 quantity that both sides are buried underground before and after the rigid leg 11 of transfer crane 1 is one group, both sides are buried underground before and after its flexible leg 12 is one group; Each earth anchor 2 is all reserved with a guy interface 21 on ground; Corresponding with it, that to be two cable wind rope 3 quantity arranged both sides before and after, its flexible leg 12 be cable wind rope 3 quantity that before and after the rigid leg 11 of transfer crane 1, both sides are arranged is two right;
2) with reference to Fig. 4, when transfer crane be subject to 13 grades ~ 14 grades wind front attack time, adopt the second arrangement form: earth anchor 2 quantity that earth anchor 2 quantity that both sides are buried underground before and after the rigid leg 11 of transfer crane 1 is one group, both sides are buried underground before and after its flexible leg 12 is one group; The one group of earth anchor 2 being embedded in both sides before and after rigid leg 11 is all reserved with two guy interfaces 21 on ground, be embedded in one group, both sides earth anchor 2 before and after flexible leg 12 and be all reserved with a guy interface 21 on ground; Corresponding with it, cable wind rope 3 quantity that before and after the rigid leg 11 of transfer crane 1, both sides are arranged is two cable wind rope 3 quantity arranged both sides before and after, its flexible leg 12 is a pair;
3) with reference to Fig. 5, when transfer crane is subject to the third arrangement form when 13 grades ~ 14 grades wind front attack: earth anchor 2 quantity that earth anchor 2 quantity that both sides are buried underground before and after the rigid leg 11 of transfer crane 1 is two groups, both sides are buried underground before and after its flexible leg 12 is one group; Each earth anchor 2 is all reserved with a guy interface 21 on ground; Corresponding with it, cable wind rope 3 quantity that before and after the rigid leg 11 of transfer crane 1, both sides are arranged is two cable wind rope 3 quantity arranged both sides before and after, its flexible leg 12 is a pair;
4) when transfer crane is positioned at 14 grades ~ 15 grades wind-force central areas and be subject to front attack: the layout of earth anchor 2 and cable wind rope 3 adopts Fig. 4, the second arrangement, also increases 3t ballast 4 on each earth anchor 2 simultaneously;
5) when transfer crane is positioned at more than 15 grades wind-force central areas and be subject to front attack: the layout of earth anchor 2 and cable wind rope 3 adopts the third arrangement, also increases 5t ballast 4 on each earth anchor 2 simultaneously.
With reference to Fig. 8 a, Fig. 8 b and Fig. 8, in step 3), described earth anchor 2 is embed-type cement concrete earth anchor, and its cross sectional shape is oblong; Be divided into large earth anchor and little earth anchor according to the size of size, the size of large earth anchor is: long 1800mm, wide 1200mm, high 800mm, and the size of little earth anchor 9a, 9b is: long 1800mm, wide 1000mm, high 600mm.Described transfer crane 1 is 40t/42m, can be formed steel construction, steel-tube construction, box beam structure; Described cable wind rope 3 is connected with the joint of truss 13 of shaped steel transfer crane 1 by sleeper 7.Other are identical with specific embodiment 1.Or cable wind rope 3 is connected with truss 13 node of steel pipe transfer crane 1 by rubber 5, gunnysack 6.
The transfer crane wind load comparison sheet of load-carrying ability 20t, 40t: main material for structure is shaped steel or steel pipe, 42m span, crane span structure height 12m ~ 18m, the wide 2.5m in crane span structure cross section, high 2.5m ~ 2.8m, the LOAD FOR under 10 grades ~ 17 grades front wind-force effects is as following table two.Wherein wind load is according to GB/T3811-2008 " hoist design specification ": Pw III=CKhPA(t) calculate, relevant value specifies by standard.Crane span structure is biplate truss structural, calculates with the crane span structure chosen and rigid leg frontal area.
Table two: wind load table (unit t)
One, the calculating of hurricane power load during inoperative
By GB/T3811-2008,8.2.1.2 hoisting crane off working state wind resistance anti-skid safety, P z2>=1.1P wIIIp z2---by the wind resistance anti-sliding resisting of the direction along ng a paths such as drg and rail clamping device, anchoring device or Windproof inhaul cable.Maximum wind load presses 800Pa(11 level and following).
Hurricane power, maximum wind load during inoperative is, manufacturer's design meets the data of the requirement of national standard.
P Z2≥1.1P WIII=1.1CK hP A(t)
=1.1×1.7×1.13×800×69/(9800)=11.9t
Learn from upper table two, during to more than 11 grades wind-force, formed steel construction transfer crane is subject to wind load all more than more than 10t.40t/42m shaped steel transfer crane hurricane power, crane span structure, by wind load 10.44t, is less than standard 11.9t; During typhoon power, crane span structure is greater than standard 11.9t by wind load 13.38t, and during as do not taked corresponding preventive, transfer crane is stressed can slide, damages or topple.
Two, guy stress accounting
Attack transfer crane by 15 grades of wind front, design & check 40t/42m transfer crane guy is stressed.
(1) 40t/42m formed steel construction transfer crane deadweight 85t, the heavy 72t of crane span structure, considers to bear all load to put earth anchor guy with pre-buried anchor.Crane span structure wind load F1=25.45t, rigid leg wind load F2=6.22t, force diagram is shown in Figure 10.
The overall stability against overturning verification of track transfer crane hoisting crane:
Guarantee stable minimum clamp rail power of not tumbling: J 1min=(25.45 × 16.8+6.22 × 8.4-85 × 3.5)/(8 × 2)=11.4t
Load large like this causes track deformation already, and during actual field construction, rail clamping device can not be stressed separately, and the guy that now pretension is crossed has born most load.
Bear all carry calculation guys with guy stressed, setting J1=0, guy and ground angle 45 °, with door frame angle 75 °, one-sided two earth anchors, respectively join a guy.
The minimum power of toppling: T 1min × 2 × 14.25+85 × 3.5-25.45 × 16.8-6.22 × 8.4>=0
T 1min≥(427.56+52.2-297.5)/14.25×2=6.4t
The stressed T of guy 1min/cos15 °=6.6t
Rigid leg side is stressed comparatively large, gets unbalance loading coefficient 1.2,
Rigid leg side guy is stressed is: 1.2 × 6.6=7.92t
Level, vertical component: P=7.92 × sin45 °=5.6t
With reference to Fig. 9 a, Fig. 9 b, earth anchor 2 involved in the present invention, the size of little earth anchor can also be: long 1800mm, wide 1000mm, high 600mm.Described transfer crane 1 can be formed steel construction, steel-tube construction, box beam structure; Described cable wind rope 3 is connected with the truss 13 of shaped steel transfer crane 1 by sleeper 7; Or be connected with the truss 13 of steel pipe transfer crane with rubber 6 by gunnysack 5.Described earth anchor 2 is embed-type cement concrete earth anchor, and its cross sectional shape is oblong.

Claims (2)

1. a typhoon protection method for transfer crane, is characterized in that comprising the following steps:
1) typhoon forecast data and relevant information is collected;
2) 12-48 hour before typhoon, walks the transfer crane (1) stopped operation to desired location, cuts off working power, clamp rail, place stirrup strap, withstand wheel under the large running wheel in side, front and back of transfer crane (1) with rail clamping device;
3) earth anchor (2) and cable wind rope (3) is arranged,
First, before and after rigid leg (11) in transfer crane (1), the foundation ditch of both sides, the foundation ditch of both sides, flexible leg (12) front and back respectively arrange at least one group of earth anchor be arranged symmetrically with (2), and each earth anchor (2) is respectively reserved with one or two guy interface (21) on ground;
Then, before and after rigid leg (11) in transfer crane (1), before and after both sides, flexible leg (12), both sides respectively arrange at least one pair of cable wind rope be arranged symmetrically with (3), and one end and the earth anchor (2) of described cable wind rope (3) are reserved in that ground guy interface (21) is fixedly connected with, its other end is fixedly connected with the truss (13) of transfer crane (1);
4) suspension hook is fixed, and large race is fixed on middle part or flexible leg (12) side end, lays 1 ~ 1.5t counterweight and fix under suspension hook, and walking of trotting is fixed to flexible leg (12) the side end position of transfer crane (1);
5) for transfer crane (1), the method for arranging of earth anchor (2) and cable wind rope (3) is as follows:
5-1) when transfer crane (1) is positioned at 12 grades-13 grades wind-force central areas and be subject to front attack, before and after the rigid leg (11) in transfer crane (1), bilateral symmetry buries one group of earth anchor (2) underground, before and after its flexible leg (12), bilateral symmetry buries one group of earth anchor (2) underground; Earth anchor (2) is actual according to place, is arranged on outer fix, or is arranged on inner side, and earth anchor (2) is angled with door frame; Each earth anchor (2) is respectively reserved with a guy interface (21) on ground; Before and after rigid leg (11) in transfer crane (1), both sides arrange a pair cable wind rope (3), before and after its flexible leg (12), both sides arrange a pair cable wind rope (3);
5-2) when transfer crane (1) is subject to 13 grades of-14 grades of wind front attacks, before and after the rigid leg (11) in transfer crane (1), both sides bury one group of large earth anchor (2) underground, before and after its flexible leg (12), both sides bury one group of little earth anchor (2) underground; The one group of large earth anchor (2) being embedded in both sides before and after rigid leg (11) is respectively reserved with two guy interfaces (21) on ground, is embedded in one group, both sides little earth anchor (2) before and after flexible leg (12) and is respectively reserved with a guy interface (21) on ground; Before and after rigid leg (11) in transfer crane (1), both sides arrange two pairs of cable wind ropes (3), before and after its flexible leg (12), both sides arrange a pair cable wind rope (3);
5-3) when transfer crane (1) is subject to 13 grades of-14 grades of wind front attacks, before and after the rigid leg (11) in transfer crane (1), both sides bury two groups of earth anchors (2) underground, before and after its flexible leg (12), both sides bury one group of earth anchor (2) underground; Each earth anchor (2) is respectively reserved with a guy interface (21) on ground; Before and after rigid leg (11) in transfer crane (1), both sides arrange two pairs of cable wind ropes (3), before and after its flexible leg (12), both sides arrange a pair cable wind rope (3);
5-4) when transfer crane (1) is positioned at 14 grades-15 grades wind-force central areas and be subject to front attack, the layout of earth anchor (2) and cable wind rope (3), taking above-mentioned 5-3) on the basis of arrangement form, add 3t saddle weight (4) in each earth anchor (2) top;
5-5) when transfer crane (1) is positioned at more than 15 grades wind-force central areas and be subject to front attack: the layout of earth anchor (2) and cable wind rope (3), taking the above-mentioned 3rd) on the basis of arrangement form, add 5t saddle weight (4) in each earth anchor (2) top.
2. the special purpose device of a transfer crane typhoon protection, the guy of the flexible leg foundation ditch of both sides, earth anchor, connection earth anchor and portal gantry, the rail of walking for transfer crane (1) and rail clamping device before and after the rigid leg foundation ditch of both sides, flexible leg before and after the rigid leg being included in transfer crane (1), is characterized in that:
1) under the large running wheel in side, front and back of transfer crane (1), place stirrup strap, withstand wheel;
2) before and after the rigid leg of transfer crane (1), bilateral symmetry buries one group of earth anchor (2) underground, before and after its flexible leg, both sides bury one group of earth anchor (2) underground, in outside or can be selected in inner side according to place situation; Each earth anchor is respectively reserved with a guy interface (21) on ground; Before and after the rigid leg of transfer crane (1), both sides arrange two pairs of cable wind ropes (3), before and after its flexible leg, both sides arrange a pair cable wind rope (3);
Or before and after the rigid leg of transfer crane (1), both sides bury one group of large earth anchor underground, before and after its flexible leg, both sides bury one group of earth anchor underground; The one group of earth anchor being embedded in both sides before and after rigid leg is respectively reserved with two guy interfaces on ground, be embedded in one group, both sides earth anchor before and after flexible leg and be respectively reserved with a guy interface (21) on ground; Before and after the rigid leg of transfer crane (1), both sides arrange a pair cable wind rope (3), before and after its flexible leg, both sides arrange a pair cable wind rope (3); 3t saddle weight is added above each earth anchor;
Or before and after the rigid leg of transfer crane (1), both sides bury two groups of earth anchors (2) underground, before and after its flexible leg, both sides bury one group of earth anchor (2) underground; Each earth anchor is respectively reserved with a guy interface (21) on ground; Before and after the rigid leg of transfer crane (1), both sides arrange two pairs of cable wind ropes (3), before and after its flexible leg, both sides arrange a pair cable wind rope (3); 5t saddle weight is added above each earth anchor;
3) one end and the earth anchor (2) of described cable wind rope (3) are reserved in that ground guy interface (21) is fixedly connected with, the joint of truss (13) of its other end and transfer crane (1) is flexible coupling;
4) laying depth of described earth anchor (2) is more than or equal to 1.5m, and described cable wind rope (3) and ground angle are less than or equal to 45 degree, and with the angle 70 °-80 ° of portal gantry, the predetermincd tension of cable wind rope (3) is 0.6-0.8t; Described earth anchor (2) for embed-type cement concrete earth anchor, its cross sectional shape be oblong or convex shape; Large earth anchor and little earth anchor is divided into according to the size of size;
5) described transfer crane (1) be steel-tube construction transfer crane, shaped steel transfer crane, box-beam structure transfer crane; Described cable wind rope (3) is connected with the joint of truss (13) of steel pipe transfer crane (1) by gunnysack (5), rubber (6); Or described cable wind rope (3) is connected with the joint of truss (13) of shaped steel transfer crane (1) by sleeper (7).
CN201010598524.7A 2010-12-21 2010-12-21 Anti-typhoon method for portal crane and special equipment thereof Expired - Fee Related CN102530721B (en)

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