CN102889950A - Method for determining holding force of landing leg of self-propelled crane - Google Patents

Abstract

The invention relates to a method determining a holding force of a landing leg of a self-propelled crane. The method comprises the following steps of: determining a position in which a hoisting gravity center is positioned; translating the hoisting gravity center to a center position of the landing leg of the crane; and overlapping according to a principle that a moment of couple formed by the gravity center translation quantity and the hoisting gravity with a moment of couple generated by the landing leg are balanced to obtain the holding force of the landing leg. According to the invention, the holding force of the landing leg of the self-propelled crane can be rapidly and accurately obtained, therefore, the basis is provided for processing a foundation, the safe operation is ensured, and the foundation is laid for the safe hoisting.

Description

A kind of definite method of mobile crane supporting leg anchorage force

Technical field

The present invention relates to crane support support technology field, particularly relate to a kind of definite method of mobile crane supporting leg anchorage force.

Background technology

At present in Larger Engineering Projects along with the quickening of project progress and the increase of weight of equipment, the degree of mechanized construction is more and more higher, use frequency and the Lifting Capacity of mobile crane to improve constantly, super-huge mobile crane lifting lifting capacity constantly refreshes, yet under the operating mode to setting in construction, the supporting leg of loop wheel machine (crawler belt) produces determining generally according to experience or estimation of maximum support power, therefore the processing to earth bearing strength has brought trouble when lifting preliminary work, and may exist potential safety hazard.Because the each several part parameter limited (size, weight) that mobile crane provides requires to carry out suitable simplification and calculates, and satisfies the demand of lifting.

Summary of the invention

The invention provides a kind of definite method of mobile crane supporting leg anchorage force, how to be obtained from rapidly and accurately dynamic formula crane support anchorage force thereby solve.

The technical solution adopted for the present invention to solve the technical problems is: a kind of definite method of mobile crane supporting leg anchorage force is provided, may further comprise the steps:

(1) definite position that lifts the center of gravity place;

(2) will lift barycenter displacement to the center of loop wheel machine supporting leg;

The principle of the moment of couple balance that the moment of couple that (3) forms according to barycenter displacement amount and lifting gravity and supporting leg the produce stressed size of leg of being supported that superposes.

The lifting center of gravity obtains by crane each several part calculation of parameter in the described step (1).

Beneficial effect

Owing to adopted above-mentioned technical scheme, the present invention compared with prior art, have following advantage and good effect: the present invention can be obtained from dynamic formula crane support anchorage force rapidly and accurately by the lifting centroid algorithm and in conjunction with the technological means of principle of moment balance, thereby for the processing of ground provides foundation, guarantee safety work, for safty hoisting lays the first stone.

Description of drawings

Fig. 1 is TC2600 type (500 tons, band surpasses) truss-like truck crane lifting operating mode synoptic diagram.

Embodiment

Below in conjunction with specific embodiment, further set forth the present invention.Should be understood that these embodiment only to be used for explanation the present invention and be not used in and limit the scope of the invention.Should be understood that in addition those skilled in the art can make various changes or modifications the present invention after the content of having read the present invention's instruction, these equivalent form of values fall within the application's appended claims limited range equally.

Embodiments of the present invention relate to a kind of definite method of mobile crane supporting leg anchorage force, may further comprise the steps: the position of determining lifting center of gravity place; To lift barycenter displacement to the center of loop wheel machine supporting leg; The principle of the moment of couple balance that the moment of couple that forms according to barycenter displacement amount and lifting gravity and supporting leg the produce stressed size of leg of being supported that superposes.

The below is that example further specifies the present invention with TC2600 type (500 tons, band surpasses) truss-like truck crane lifting (see figure 1).

TC2600 type (500 tons, band surpasses) truss-like automobile parameters is as follows:

The SSL operating mode

Equipment lift heavy 146t(comprises suspension hook etc.), turning radius 36m

Main arm 90m; Principal arm gross weight 68t(is by 0.75t/m).

Conversion is to centre of gravity place 19.3m---and consider again that by (36m-2.3m)/2=16.85m head slightly refetches 17m, add principal arm bearing pin centre distance centre of gyration 2.3m, therefore be decided to be 19.3m..

This body weight of loop wheel machine 102t(centre of gravity place 1.5m---by top car rotary disk radius+bottom car weight heart side-play amount).

Counterweight 148t(centre of gravity place 6.4m after on the body).

Surpassed the heavy 22t(centre of gravity place of arm 7.5m---press 15m/2=7.5m).

15 meters of super lifting 250t(radiuses).

Loop wheel machine supporting leg spacing: L indulges the horizontal 15.5m(supporting leg of 15.5m, the L center of can handing over and overlaps with the centre of gyration).The lifting centre of gravity place is determined:

Gross weight T:146t+68t+102t+148t+22+250t=736t

Center of gravity: establish the lifting distance of centre of gravity loop wheel machine top car centre of gyration and be of a size of X:

146(36-X)+68(19.3-X)=250(15+X)+22(7.5+X)+148(6.4+X)+102(1.5+X)

1553.2＝736·X X=2.11m

Parallel direction supporting leg Force Calculation:

Even distributed force: P1=T/4, P1=736t/4 obtains P1=184t.

Moment: establishing supporting leg is P2 to the acting force that moment produces, and gets according to principle of moment balance

TX – L indulges P22=0

P2=(736t2.11m)/(15.5m2) obtain P2=50.1t.

Stack: R ₁=P1-P2R ₂=P1+P2 can get

R ₁=184t – 50.1t=133.9t(is minimum)

R ₂=184t+50.1t=234.1t。(maximum)

45 degree direction supporting leg Force Calculation:

Obtain according to principle of moment balance

$P2=(736t\·2.11m\·1.03)/\sqrt{{15.5}^{2}m+{15.5}^{2}m}$ Can get P2=72.97t

Stack: R ₁=P1-P2 R ₂=P1+P2

R ₁=184t-72.97t=111t (minimum)

R ₂=184t+72.97t=257t(is maximum)

90 degree direction supporting leg Force Calculation:

Obtain the horizontal P22=0 of TX1.06 – L according to principle of moment balance

P2=（736t·2.11m·1.06）/(15.5m·2) P2=53.1t

Stack: R ₁=P1-P2 R ₂=P1+P2

R ₁=184t – 53.1t=130.9t (minimum)

R ₂=184t+53.1t=237.1t (maximum)

Need to prove, use surpass (counterweight is arranged) after, car weight greatly reduces on the impact of barycentre offset during the revolution of top car, therefore 45 gets 1.03 coefficient when spending direction, 90 get 1.06 coefficient when spending direction.TC2600 loop wheel machine supporting leg center overlaps with the centre of gyration, does not therefore need to calculate the skew of supporting leg position and causes support bearing power (when spending direction such as 90, two supporting legs of homonymy are stressed) difference.The mobile crane Computing Principle of other pattern is identical, can change according to the crane structure difference in calculating.

Be not difficult to find that the present invention can be obtained from dynamic formula crane support anchorage force rapidly and accurately by the lifting centroid algorithm and in conjunction with the technological means of principle of moment balance, thereby for the processing of ground provides foundation, guarantees safety work, for safty hoisting lays the first stone.

Claims (2)

1. definite method of a mobile crane supporting leg anchorage force is characterized in that, may further comprise the steps:

(1) definite position that lifts the center of gravity place;

(2) will lift barycenter displacement to the center of loop wheel machine supporting leg;

The principle of the moment of couple balance that the moment of couple that (3) forms according to barycenter displacement amount and lifting gravity and supporting leg the produce stressed size of leg of being supported that superposes.

2. definite method of mobile crane supporting leg anchorage force according to claim 1 is characterized in that, the lifting center of gravity obtains by crane each several part calculation of parameter in the described step (1).