CN102530721A - Anti-typhoon method for portal crane and special equipment thereof - Google Patents
Anti-typhoon method for portal crane and special equipment thereof Download PDFInfo
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- CN102530721A CN102530721A CN2010105985247A CN201010598524A CN102530721A CN 102530721 A CN102530721 A CN 102530721A CN 2010105985247 A CN2010105985247 A CN 2010105985247A CN 201010598524 A CN201010598524 A CN 201010598524A CN 102530721 A CN102530721 A CN 102530721A
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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
Technical field:
The present invention relates generally to a kind of typhoon protection method and isolated plant of transfer crane, to the needs of the large-scale typhoon of coastland transfer crane (also being called for short gantry overhang-door) protection.Belong to the crane safety technical field.
Background technology:
Gantry crane for general use is made up of keystone configurations such as crane span structure, supporting leg, big treadmill cars, also is gauntry crane, is that frequent elevator machinery is used in building sites such as municipal administration, harbour, power plant, and its operating efficiency is high, and cost is low.The crane bridge height is many not to be waited at 10～30m, and with the hoisting crane contrast of other type, transfer crane is top-heavy, and wind area is big, poor stability, and when coastal outdoor work, the typhoon protection measure is strict.
In recent years, the coastland is attacked by large-scale typhoon frequently, causes the transfer crane overthrow accident of a plurality of thermal power plants construction site like typhoons in 2008 " black square ratio ".In the existing transfer crane typhoon protection technical measures, most construction enterprises adopt manufacturer to join the wind protection that skate, rail clamping device add windproof drag-line, prevent that transfer crane from damaging and tumble.In actual mechanical process, because transfer crane wind load and wind protection wind loading rating are lacked calculating, judge deviation for the size of wind-force, cause typhoon protection measure inefficacy, the strong wind transfer crane that blows down causes damage to production and construction.Through verification; Standard GB/T14406-1993 " gantry crane for general use " regulation hoisting crane off working state maximum wind pressure is not more than 800Pa (being equivalent to hurricane speed); Manufacturer's wind protection need only satisfy the requirement of shelter of wind-force below 11 grades, just meets standard.For the typhoon of wind-force more than 11 grades, the wind protection of producer is often inoperative, causes fixedly rail clamping device to be broken, the track stretch bending, or steel rope is broken.Therefore, in coastal typhoon prone areas, the measure of mono-typhoon protection can not meet the demands.More comprehensive, comprehensive typhoon protection method has been very necessary.
Summary of the invention:
First purpose of the present invention is in order to solve in the transfer crane typhoon protection technical measures of the prior art, and stirrup strap, rail clamping device, windproof drag-line can not satisfy the requirement of shelter of wind-force more than 11 grades, and a kind of typhoon protection method of transfer crane is provided.
Second purpose of the present invention is the isolated plant for the typhoon protection that a kind of transfer crane is provided.
First purpose of the present invention can reach through taking following technical scheme:
A kind of typhoon protection method of transfer crane is characterized in that may further comprise the steps:
1) collects local typhoon data and forecast information, formulate scheme targetedly;
2) arrived preceding 12～48 hours at typhoon, with the transfer crane that the stops operation desired location of walking, the cut-out working power is clamped rail with rail clamping device, and the big running wheel held of side stirrup strap withstands wheel in the front and back of transfer crane.
3) arrange earth anchor and cable wind rope:
At first; The foundation ditch of the foundation ditch of both sides, both sides, flexible leg front and back respectively is provided with the earth anchor of at least one group of symmetric arrangement before and after the rigidity leg of transfer crane; Or reserve the casting concrete anchor point, and each earth anchor place backfill sand compacting, each is reserved with one or two guy interface on ground;
Then; Both sides respectively are provided with the cable wind rope of at least one pair of symmetric arrangement before and after both sides, flexible leg before and after the rigidity leg of transfer crane; Cable wind rope and portal gantry at angle, an end of said cable wind rope and earth anchor or anchor point are reserved in that ground guy interface is captiveed joint, the joint of truss of its other end and transfer crane is flexible coupling;
4) fixing suspension hook, the big race is fixed in middle part or flexible leg side end, lays 1～1.5t counterweight under the suspension hook and fixes, the flexible leg side end stationkeeping of transfer crane of walking of trotting.
After typhoon, remove said apparatus by reverse procedure, transfer crane is place in operation again.
Detect according to practical experience, hurricane power, when the long formed steel construction transfer crane of 40t/42m received front high wind, the wind load that crane span structure produces was up to 10.44t, and the rigidity leg produces the power of 2.55t.Wind load in the time of more than 12 grades is bigger, and the device that producer provides can not satisfy the requirement of typhoon protection.The present invention is through pre-buried earth anchor of design and guy combination, and the positive and oblique various wind loads of opposing are combined as the main method that cooperates stirrup strap, rail clamping device with guy.
First purpose of the present invention can also reach through taking following technical scheme:
A kind of embodiment that realizes the present invention's first purpose is: the method for arranging to transfer crane earth anchor and cable wind rope is following:
1) when transfer crane is positioned at 11 grades～13 grades wind-force central areas and receive positive the attack, bilateral symmetry is buried one group of small dimension earth anchor (being called for short little earth anchor) underground, is buried one group of little earth anchor underground in its flexible leg front and back bilateral symmetry before and after the rigidity leg of transfer crane; Earth anchor is actual according to the place, can be arranged on outside solid line position, also can be arranged on inboard dotted line position, and earth anchor and door frame are angled.Each is reserved with a guy interface each earth anchor on ground; Both sides are provided with a pair of cable wind rope, in its both sides, flexible leg front and back a pair of cable wind rope are set before and after the rigidity leg of transfer crane;
2) when transfer crane received the positive attack of 13 grades～14 grades wind-force, both sides were buried one group of big earth anchor underground before and after the rigidity leg of transfer crane, and both sides are buried one group of little earth anchor underground before and after its flexible leg; The one group of earth anchor that is embedded in both sides, rigidity leg front and back respectively is reserved with two guy interfaces on ground, and be embedded in the one group of earth anchor in flexible leg both sides, front and back each is reserved with a guy interface on ground; Both sides are provided with two pairs of cable wind ropes, in its both sides, flexible leg front and back a pair of cable wind rope are set before and after the rigidity leg of transfer crane;
3) when transfer crane receives the positive attack of 13 grades～14 grades wind-force, both sides are buried two groups of little earth anchors underground, are buried one group of little earth anchor underground in its both sides, flexible leg front and back before and after the rigidity leg of transfer crane; Each is reserved with a guy interface each earth anchor on ground; Both sides are provided with two pairs of cable wind ropes, in its both sides, flexible leg front and back a pair of cable wind rope are set before and after the rigidity leg of transfer crane;
4) when transfer crane was positioned at 14 grades～15 grades wind-force central areas and receive positive the attack, the layout of earth anchor and cable wind rope was taking the above-mentioned the 2nd) on the basis of arrangement form, above each earth anchor, add the 3t saddle weight;
5) when transfer crane is positioned at more than 15 grades the wind-force central area and receive positive the attack: the layout of earth anchor and cable wind rope, taking the above-mentioned the 3rd) on the basis of arrangement form, above each earth anchor, add the 5t saddle weight.
Second purpose of the present invention can reach through taking following measure:
A kind of isolated plant of typhoon protection of transfer crane; Be included in flexible leg foundation ditch, earth anchor, connection earth anchor and the portal gantry of both sides before and after the rigidity leg foundation ditch, flexible leg of both sides before and after the rigidity leg of transfer crane guy, supply the rail and the rail clamping device of transfer crane walking; It is characterized in that: the flexible leg foundation ditch of the rigidity leg foundation ditch of both sides, both sides, flexible leg front and back respectively is provided with the earth anchor of at least one group of symmetric arrangement before and after the rigidity leg of transfer crane, and each is reserved with one or two guy interface each earth anchor on ground; Both sides respectively are provided with the cable wind rope of at least one pair of symmetric arrangement before and after both sides, the flexible leg before and after the rigidity leg of transfer crane, and an end and the earth anchor of said cable wind rope is reserved in that ground guy interface is captiveed joint, the truss of its other end and transfer crane is flexible coupling.In the front and back of transfer crane the big running wheel held of side stirrup strap, withstand wheel.
The present invention can pass through the loading analysis of all kinds transfer crane under wind effect at different levels; Safeguard procedures are targetedly proposed; Reduce the tilting moment of transfer crane, clearly relevant protection main points make transfer crane can satisfy the typhoon invasion and attack requirement more than 11 grades of opposing wind-force.
Second purpose of the present invention can also reach through taking following measure:
A kind of embodiment that realizes the present invention's second purpose is: the laying depth of said earth anchor is more than or equal to 1.5m; The backfill sand presses closely; Said cable wind rope and ground angle are less than or equal to 45 °, and with 70 °～80 ° of the angles of portal gantry, the predetermincd tension of cable wind rope is 0.6～0.8t.
A kind of embodiment that realizes the present invention's second purpose is: said earth anchor is embed-type cement concrete earth anchor, and its cross sectional shape is oblong or convex shape; Size according to size is divided into big earth anchor and little earth anchor.
A kind of embodiment that realizes the present invention's second purpose is: poured integral concrete foundation in advance, underlying strength and anchoring device intensity satisfy the guy force request.
A kind of embodiment that realizes the present invention's second purpose is: to transfer crane
1) bilateral symmetry is buried one group of earth anchor underground before and after the rigidity leg of transfer crane, both sides are buried one group of earth anchor underground before and after its flexible leg, according to the place situation can be in the outside (solid line) or be selected in inboard (dotted line); Each is reserved with a guy interface each earth anchor on ground; Both sides are provided with two pairs of cable wind ropes, in its both sides, flexible leg front and back a pair of cable wind rope are set before and after the rigidity leg of transfer crane;
2) or before and after the rigidity leg of transfer crane both sides are buried one group of big earth anchor underground, both sides are buried one group of earth anchor underground before and after its flexible leg; The one group of earth anchor that is embedded in both sides, rigidity leg front and back respectively is reserved with two guy interfaces on ground, and be embedded in the one group of earth anchor in flexible leg both sides, front and back each is reserved with a guy interface on ground; Both sides are provided with a pair of cable wind rope, in its both sides, flexible leg front and back a pair of cable wind rope are set before and after the rigidity leg of transfer crane;
3) or before and after the rigidity leg of transfer crane both sides are buried two groups of earth anchors underground, both sides are buried one group of earth anchor underground before and after its flexible leg; Each is reserved with a guy interface each earth anchor on ground; Both sides are provided with two pairs of cable wind ropes, in its both sides, flexible leg front and back a pair of cable wind rope are set before and after the rigidity leg of transfer crane;
4) or taking the 2nd) on the basis that is provided with, above each earth anchor, add the 3t saddle weight;
5) or taking the 3rd) on the basis that is provided with, above each earth anchor, add the 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 effect at different levels; Transfer crane magnitude of load to different model; Propose safeguard procedures targetedly, design the combination of different grappling guy devices, reduce more than 11 grades violent typhoon load transfer crane is damaged; Scientific and effective guidance is provided for the typhoon protection scheme of on-the-spot transfer crane, makes transfer crane can satisfy the typhoon invasion and attack requirement more than 11 grades of opposing wind-force.
2, the isolated plant that the present invention relates to; It can pass through the loading analysis of all kinds transfer crane under wind effect at different levels; Safeguard procedures are targetedly proposed; Reduce the tilting moment of transfer crane, clearly relevant protection main points make transfer crane can satisfy the typhoon invasion and attack requirement more than 11 grades of opposing wind-force.
Description of drawings:
Fig. 1 adopts the present invention to implement the construction process figure of typhoon protection.
Fig. 2 is the structural front view of the specific embodiment of the invention 1.
Fig. 3 is that the present invention tackles the structure birds-eye view that transfer crane is positioned at 11 grades～13 grades of wind-force central areas.
Fig. 4 is that the present invention tackles the structural front view that transfer crane is positioned at 13 grades～14 grades of wind-force central areas.
Fig. 5 is that the present invention tackles the structure birds-eye view that transfer crane is positioned at 13 grades～14 grades of wind-force central areas.
Fig. 6 is that cable wind rope of the present invention is connected scheme drawing with the shaped steel joint of truss.
Fig. 7 is that cable wind rope of the present invention is connected scheme drawing with the steel pipe truss node.
Fig. 8 a is the front view of the big earth anchor of the specific embodiment of the invention.
Fig. 8 b is the cut-away view of the big 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 adopts transfer crane wind load force diagram when of the present invention.
The specific embodiment:
Specific embodiment 1:
With reference to Fig. 1, Fig. 2 and Fig. 3, the isolated plant that present embodiment uses comprises transfer crane 1, supplies the rail and the rail clamping device of transfer crane 1 walking, in the front and back of transfer crane 1 the big running wheel held of side stirrup strap, withstand wheel; At the foundation ditch of the both sides, rigidity leg 11 front and back of transfer crane 1, the foundation ditch of both sides, flexible leg 12 front and back the earth anchor 2 of at least one group of symmetric arrangement is set respectively, each is reserved with one or two guy interface 21 each earth anchor 2 on ground; In the both sides, rigidity leg 11 front and back of transfer crane 1, the cable wind rope 3 that both sides, flexible leg 12 front and back respectively are provided with at least one pair of symmetric arrangement, an end of said cable wind rope 3 is reserved in earth anchor 2 that ground guy interface 21 is captiveed joint, its other end is captiveed joint with the truss 13 of transfer crane 1.The laying depth of said earth anchor 2 is more than or equal to 1.5m, and said cable wind rope 3 is less than or equal to 45 degree with the ground angle, and the predetermincd tension of cable wind rope 3 is 0.8～1t; Said earth anchor 2 is embed-type cement concrete earth anchor, and its cross sectional shape is oblong or convex shape; Size according to size is divided into big earth anchor and little earth anchor.Said cable wind rope 3 is connected with the joint of truss 13 of steel pipe transfer crane 1 through gunnysack 5, rubber 6; Perhaps said cable wind rope 3 is connected with the joint of truss 13 of shaped steel transfer crane 1 through sleeper 7.
Present embodiment relates to a kind of typhoon protection method of transfer crane 1, may further comprise the steps:
1) collects typhoon data, forecast information; Confirm windproof scheme, organization; Prepare windproof goods and materials, instrument;
2) typhoon arrived preceding 12～48 hours, and transfer crane 1 stops operation, and cutting off the electricity supply in the desired location of walking, clamps rail with rail clamping device, and the big running wheel held of side stirrup strap withstands wheel in front and back;
3) layout of earth anchor 2 and cable wind rope 3: in the foundation ditch of the both sides, rigidity leg 11 front and back of transfer crane 1, be embedded with one group of earth anchor 2 of arranging symmetrically, in the foundation ditch of the both sides, flexible leg 12 front and back of transfer crane 1, be embedded with one group of earth anchor 2 of arranging symmetrically; Each earth anchor 2 all is reserved with a guy interface 21 on ground; Corresponding with it, be provided with the cable wind rope 3 that at least one pair of is arranged symmetrically in the both sides, rigidity leg 11 front and back of transfer crane 1, be provided with the cable wind rope 3 that at least one pair of is arranged symmetrically in the both sides, flexible leg 12 front and back of transfer crane 1; One end of cable wind rope 3 is reserved in earth anchor 2 that ground guy interface 21 is captiveed joint, its other end is captiveed joint with the truss 13 of transfer crane 1;
A, guy arrangement requirement: cable wind rope 3 and ground-surface angle must not be greater than 45 °, with the portal gantry angle be 70 °～80 °, cable wind rope 3 symmetric arrangement, predetermincd tension equates; Transfer crane crane span structure joint of truss according to the concrete shape of steel pipe node or section bar node, must adopt the good cornerite point of corresponding binding method pad;
When b, fixed gantry crane, behind the chain block pretension cable wind rope 3, install the steel rope protection additional;
C, steel rope end connect with rope clamp, must U type annulus place be installed on the first side of end during the installing rope clamp; Each rope clamp all should be screwed to certain degree, wirerope diameter is flattened about 1/3 be advisable.Φ 20 must not be less than four rope clamps, spacing 120～140mm with Φ 22 steel ropes;
D, cable wind rope 3 must not be less than the regulations of following table one with the safety distance of overhead transmission line and other charged body.
The safety distance of table one door type hoisting crane and charged body
Voltage KV＜1 1～10 35 110 220
Along vertical distance 1.5 3.0 4.0 5.0 6.0
Safety distance
Along horizontal throw 1.0 1.5 2.0 4.0 6.0
4) suspension hook is fixed: the big race is fixed in middle part or flexible leg 12 side ends, lays the 1t counterweight under the suspension hook and fixes, the flexible leg 12 side end stationkeeping of transfer crane of walking of trotting.
5) after the typhoon, remove wind-proof device, transfer crane 1 is place in operation again.
In the present embodiment:
In step 3), the laying depth of said 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 the backfill sand is fastening to be tamped, and answers detailed inspection after burying underground.The place that violent typhoon is often arranged, according to the force-bearing situation and the soil property situation of scale of wind force, earth anchor 2, earth anchor 2 laying depth surpass computing value, and underlying strength strengthens.Said cable wind rope 3 must not be greater than 45 degree, predetermincd tension 0.6～0.8t with the ground angle;
With reference to Fig. 8 a, Fig. 8 b, in step 3), said earth anchor 2 is embed-type cement concrete earth anchor 2, and its cross sectional shape is a convex shape; Size according to size is divided into big earth anchor and little earth anchor.The size of big 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; Be 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 two above transfer cranes are arranged on the same track, but symmetric arrangement earth anchor 2 guys 3, necessary pre-buried big earth anchor 2 between the hoisting crane.
With reference to Fig. 3, in step 3), said transfer crane 1 can be steel-tube construction transfer crane, profile structure transfer crane, box-beam structure transfer crane; Said cable wind rope 3 is connected with the joint of truss 13 of steel pipe transfer crane 1 through gunnysack 5, rubber 6.Or said cable wind rope is connected with profile structure transfer crane 1 joint of truss 13 through sleeper, gunnysack.
The present embodiment characteristics are: said 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 kinds of forms:
1) with reference to Fig. 3; When transfer crane is positioned at 11 grades～13 grades wind-force central areas and receive positive the attack, adopt first kind of arrangement form: earth anchor 2 quantity of burying underground in the both sides, rigidity leg 11 front and back of transfer crane 1 are that earth anchor 2 quantity that a group, its both sides, flexible leg 12 front and back are buried underground are one group; Each earth anchor 2 all is reserved with a guy interface 21 on ground; Corresponding with it, cable wind rope 3 quantity that the both sides, rigidity leg 11 front and back of transfer crane 1 are provided with are that two pairs, cable wind rope 3 quantity of its flexible leg 12 front and back both sides setting are two pairs.
2) with reference to Fig. 4; When transfer crane receives that 13 grades～14 grades wind-force are positive to be attacked, adopt second kind of arrangement form: earth anchor 2 quantity of burying underground in the both sides, rigidity leg 11 front and back of transfer crane 1 are that earth anchor 2 quantity that a group, its both sides, flexible leg 12 front and back are buried underground are one group; The one group of earth anchor 2 that is embedded in both sides, rigidity leg 11 front and back all is reserved with two guy interfaces 21 on ground, be embedded in the one group of earth anchor 2 in both sides, flexible leg 12 front and back and all be reserved with a guy interface 21 on ground; Corresponding with it, cable wind rope 3 quantity that the both sides, rigidity leg 11 front and back of transfer crane 1 are provided with are that two pairs, cable wind rope 3 quantity of its flexible leg 12 front and back both sides setting are a pair of.
3) with reference to Fig. 5, the third arrangement form when transfer crane receives that 13 grades～14 grades wind-force are positive to be attacked: earth anchor 2 quantity of burying underground in the both sides, rigidity leg 11 front and back of transfer crane 1 are that earth anchor 2 quantity that two groups, its both sides, flexible leg 12 front and back are buried underground are one group; Each earth anchor 2 all is reserved with a guy interface 21 on ground; Corresponding with it, cable wind rope 3 quantity that the both sides, rigidity leg 11 front and back of transfer crane 1 are provided with are that two pairs, cable wind rope 3 quantity of its flexible leg 12 front and back both sides setting are a pair of;
4) when transfer crane is positioned at 14 grades～15 grades wind-force central areas and receive positive the attack: the layout of earth anchor 2 and cable wind rope 3 adopts Fig. 4, and second kind of arrangement also increases 3t ballast 4 simultaneously on each earth anchor 2;
5) when transfer crane is positioned at wind-force central area more than 15 grades and receive positive the attack: the layout of earth anchor 2 and cable wind rope 3 adopts the third arrangement, also on each earth anchor 2, increases 5t ballast 4 simultaneously.
With reference to Fig. 8 a, Fig. 8 b and Fig. 8, in step 3), said earth anchor 2 is embed-type cement concrete earth anchor, and its cross sectional shape is an oblong; Size according to size is divided into big earth anchor and little earth anchor, and the size of big earth anchor is: long 1800mm, wide 1200mm, high 800mm, the size of little earth anchor 9a, 9b is: long 1800mm, wide 1000mm, high 600mm.Said transfer crane 1 is 40t/42m, can be formed steel construction, steel-tube construction, box beam structure; Said cable wind rope 3 is connected with the joint of truss 13 of shaped steel transfer crane 1 through sleeper 7.Other are identical with specific embodiment 1.Or cable wind rope 3 is connected with truss 13 nodes of steel pipe transfer crane 1 through rubber 5, gunnysack 6.
The transfer crane wind load comparison sheet of load-carrying ability 20t, 40t: structure master's material is shaped steel or steel pipe; The 42m span; Crane span structure height 12m～18m, the wide 2.5m in crane span structure cross section, high 2.5m～2.8m, LOAD FOR such as following table two under 10 grades～17 grades positive wind effect.Wherein wind load calculates according to GB/T3811-2008 " hoist design specification ": PwIII=CKhPA (t), and relevant value is by standard code.Crane span structure is the biplate truss structural, calculates with crane span structure and the rigidity leg frontal area of choosing.
Table two: wind load table (t of unit)
One, the calculating of hurricane power load during inoperative
Press GB/T3811-2008, the anti-skidding safety of 8.2.1.2 hoisting crane off working state wind resistance, P
Z2>=1.1P
WIIIP
Z2---by the anti-slip resistance of the wind resistance of direction along ng a paths such as drg and rail clamping device, anchoring device or windproof drag-line.Maximum wind load is pressed 800Pa (11 grades and following).
Hurricane power, the maximum wind load during inoperative are the data of the requirement of manufacturer's design National standard.
P
Z2≥1.1P
WIII＝1.1CK
hP
A(t)
＝1.1×1.7×1.13×800×69/(9800)＝11.9t
Learn that from last table two to more than 11 grades during wind-force, the formed steel construction transfer crane is all surpassed more than the 10t by wind load.40t/42m shaped steel transfer crane hurricane power, crane span structure receives wind load 10.44t, less than standard 11.9t; During typhoon power, crane span structure receives wind load 13.38t overgauge 11.9t, and when not taking corresponding preventive, transfer crane is stressed can to slide, damage or topple.
Two, the stressed accounting of guy
By the positive transfer crane that attacks of 15 grades of wind-force, designed and checked 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 the earth anchor guy with pre-buried anchor.Crane span structure wind load F1=25.45t, rigidity leg wind load F2=6.22t, force diagram is seen Figure 10.
The whole 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
Big like this load causes track deformation already, and during the actual field construction, rail clamping device can be not stressed separately, and the guy that this moment, pretension was crossed has born most loads.
It is stressed to bear all load calculating guys with guy, sets J1=0,45 ° of guy and ground angles, and with 75 ° of door frame angles, one-sided two earth anchors are respectively joined a guy.
Minimum power: the T that topples
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
15 °=6.6t of the stressed T1min/cos of guy
Rigidity leg side is stressed bigger, gets unbalance loading coefficient 1.2,
Rigidity leg side guy is stressed to be: 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.Said transfer crane 1 can be formed steel construction, steel-tube construction, box beam structure; Said cable wind rope 3 is connected with the truss 13 of shaped steel transfer crane 1 through sleeper 7; Or be connected with the truss 13 of steel pipe transfer crane with rubber 6 through gunnysack 5.Said earth anchor 2 is embed-type cement concrete earth anchor, and its cross sectional shape is an oblong.
Claims (5)
1. the typhoon protection method of a transfer crane is characterized in that may further comprise the steps:
1) collects typhoon forecast data and relevant information;
2) arrived preceding 12～48 hours at typhoon, with the transfer crane that stops operation (1) desired location of walking, the cut-out working power is clamped rail with rail clamping device, and the big running wheel held of the front and back side stirrup strap at transfer crane (1) withstands wheel;
3) arrange earth anchor (2) and cable wind rope (3),
At first, the foundation ditch of the foundation ditch of both sides, both sides, flexible leg (12) front and back respectively is provided with the earth anchor (2) of at least one group of symmetric arrangement before and after the rigidity leg (11) of transfer crane (1), and each is reserved with one or two guy interface (21) each earth anchor (2) on ground;
Then; Both sides respectively are provided with the cable wind rope (3) of at least one pair of symmetric arrangement before and after both sides, the flexible leg (12) before and after the rigidity leg (11) of transfer crane (1), and an end of said cable wind rope (3) is reserved in earth anchor (2) that ground guy interface (21) is captiveed joint, its other end is captiveed joint with the truss (13) of transfer crane (1);
4) suspension hook is fixed, and big the race is fixed in middle part or flexible leg (12) side end, lays 1～1.5t counterweight under the suspension hook and fixes, flexible leg (12) the side end stationkeeping of transfer crane (1) of walking of trotting.
2. the typhoon protection method of a kind of transfer crane according to claim 1 is characterized in that: to transfer crane (1), the method for arranging of earth anchor (2) and cable wind rope (3) is following:
1) when transfer crane (1) is positioned at 12 grades～13 grades wind-force central areas and receive positive the attack, bilateral symmetry is buried one group of earth anchor (2) underground before and after the rigidity leg (11) of transfer crane (1), bilateral symmetry is buried one group of earth anchor (2) underground in its flexible leg (12) front and back; Earth anchor (2) is actual according to the place, can be arranged on outside solid line position, also can be arranged on inboard dotted line position, and earth anchor (2) is angled with door frame.Each is reserved with a guy interface (21) each earth anchor (2) on ground; Both sides are provided with a pair of cable wind rope (3), in both sides, its flexible leg (12) front and back a pair of cable wind rope (3) are set before and after the rigidity leg (11) of transfer crane (1);
2) when transfer crane (1) receives the positive attack of 13 grades～14 grades wind-force, both sides are buried one group of big earth anchor (2) underground, are buried one group of little earth anchor (2) underground in both sides, its flexible leg (12) front and back before and after the rigidity leg (11) of transfer crane (1); The one group of big earth anchor (2) that is embedded in both sides, rigidity leg (11) front and back respectively is reserved with two guy interfaces (21) on ground, and be embedded in flexible leg (12) the front and back one group of little earth anchor in both sides (2) each is reserved with a guy interface (21) on ground; Both sides are provided with two pairs of cable wind ropes (3), in both sides, its flexible leg (12) front and back a pair of cable wind rope (3) are set before and after the rigidity leg (11) of transfer crane (1);
3) when transfer crane (1) receives the positive attack of 13 grades～14 grades wind-force, both sides are buried two groups of earth anchors (2) underground, are buried one group of earth anchor (2) underground in both sides, its flexible leg (12) front and back before and after the rigidity leg (11) of transfer crane (1); Each is reserved with a guy interface (21) each earth anchor (2) on ground; Both sides are provided with two pairs of cable wind ropes (3), in both sides, its flexible leg (12) front and back a pair of cable wind rope (3) are set before and after the rigidity leg (11) of transfer crane (1);
4) when transfer crane (1) was positioned at 14 grades～15 grades wind-force central areas and receive positive the attack, the layout of earth anchor (2) and cable wind rope (3) was taking the above-mentioned the 3rd) on the basis of arrangement form, add 3t saddle weight (4) in each earth anchor (2) top;
5) when transfer crane (1) is positioned at more than 15 grades the wind-force central area and receive positive the attack: the layout of earth anchor (2) and cable wind rope (3), taking the above-mentioned the 3rd) on the basis of arrangement form, add 5t saddle weight (4) in each earth anchor (2) top.
3. the isolated plant of a transfer crane typhoon protection; Be included in flexible leg foundation ditch, earth anchor, connection earth anchor and the portal gantry of both sides before and after the rigidity leg foundation ditch, flexible leg of both sides before and after the rigidity leg of transfer crane (1) guy, supply the rail and the rail clamping device of transfer crane (1) walking, it is characterized in that: at the big running wheel held of the front and back side stirrup strap of transfer crane (1), withstand wheel; The foundation ditch of the foundation ditch of both sides, both sides, flexible leg (12) front and back respectively is provided with the earth anchor (2) of at least one group of symmetric arrangement before and after the rigidity leg (11) of transfer crane (1), and each is reserved with one or two guy interface (21) each earth anchor (2) on ground; Both sides respectively are provided with the cable wind rope (3) of at least one pair of symmetric arrangement before and after both sides, the flexible leg (12) before and after the rigidity leg (11) of transfer crane (1), and an end of said cable wind rope (3) and earth anchor (2) are reserved in that ground guy interface (21) is captiveed joint, the joint of truss (13) of its other end and transfer crane (1) is flexible coupling.
4. the isolated plant of a kind of transfer crane typhoon protection according to claim 5; It is characterized in that: the laying depth of said earth anchor (2) is more than or equal to 1.5m; Said cable wind rope (3) is less than or equal to 45 degree with the ground angle; With 70 °～80 ° of the angles of portal gantry, the predetermincd tension of cable wind rope (3) is 0.6～0.8t; Said earth anchor (2) is embed-type cement concrete earth anchor, and its cross sectional shape is oblong or convex shape; Size according to size is divided into big earth anchor and little earth anchor.
5. the isolated plant of a kind of transfer crane typhoon protection according to claim 3 is characterized in that: said transfer crane (1) is steel-tube construction transfer crane, shaped steel transfer crane, box-beam structure transfer crane; Said cable wind rope (3) is connected with the joint of truss (13) of steel pipe transfer crane (1) through gunnysack (5), rubber (6); Perhaps said cable wind rope (3) is connected with the joint of truss (13) of shaped steel transfer crane (1) through sleeper (7).
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103640972A (en) * | 2013-11-25 | 2014-03-19 | 无锡起岸重工机械有限公司 | Crane hook fixing device |
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| CN110356967A (en) * | 2019-07-30 | 2019-10-22 | 中建城市建设发展有限公司 | A kind of gantry crane |
| CN113285404A (en) * | 2021-05-11 | 2021-08-20 | 中铁三局集团有限公司 | Method and structure for mounting electric bridge frame without destroying waterproof layer and heat-insulating layer |
| CN114890303A (en) * | 2022-07-13 | 2022-08-12 | 江苏格雷特起重机械有限公司 | Windproof door type hoisting device for large-span hoisting |
| CN114890303B (en) * | 2022-07-13 | 2022-11-08 | 江苏格雷特起重机械有限公司 | Windproof door type hoisting device for large-span hoisting |
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