CN100528731C - Wharf crane and construction method - Google Patents

Abstract

The invention aims at providing a novel structural wharf crane and a construction method thereof, and satisfies the needs of sectional transportation of the especially big bridge body of a modern long-span highway and a railway. The wharf crane of the invention comprises a plurality of groups of upright posts, a fixing suspension point and a crown block run system, and the fixing suspension point is composed of corresponding upright post bases, a main truss, a lifting truss, a windlass lifting system and pulley blocks. The wharf crane also comprises a cantilever, and the cantilever is composed of the front end of the main truss, the upright posts and a steel tube triangular support; the lower end is hinged with upright post bases; other upright posts are fixedly connected with the upright post bases. At least one upright post base near the cantilever forms a flexible connection with the main truss. The inner side of the steel tube triangular support is provided with a balance weight, and one balance weight is arranged on a position of the upright post. The main truss is provided with a longitudinal slope, and the slope can be set at 0.5 percent. The wharf crane has the construction method that the wharf crane steps over the highway, a riverbank and the cantilever are extended to a riverway; the wharf crane is spanned on a position of a pier used for constructing a new railway bridge, an included angle exists between a center line of the main truss of the wharf crane and the center line of the riverway, and the lifting truss is parallel to the center line of the highway.

Description

A kind of wharf crane and construction method thereof

Technical field:

The present invention relates to modern large span highway, the especially big bridge body section transhipment of railway technical field, specifically is under the condition that does not influence water route and land transport, realizes that the beam body is from water channel disembarkation and traversing a kind of wharf crane and construction method thereof in place.

Background technology:

General precast beam is transported by water, and the conventional trestle method that adopts of the harbour of setting must take the river course, the influence navigation; And the trestle height is limited, can't satisfy for the needs of transporting the precast beam highway crossing.Have no idea to satisfy large span highway, the especially big bridge body segment of railway requirement transhipment requirement more.

Summary of the invention:

The wharf crane and the construction method thereof that the purpose of this invention is to provide a kind of new structure satisfy modern large span highway, the especially big bridge body section transhipment of railway needs.

For realizing that the technical scheme that the object of the invention adopts is: a kind of wharf crane, comprise fixedly suspension centre, overhead traveling crane walking system that many group columns and corresponding upright post basic, main couple, a hanging truss, winch tackling system, assembly pulley are formed, also include cantilever, this cantilever is that main couple front end and column, a steel pipe gusseted constitute, its lower end and upright post basic are hinged, and other columns are captiveed joint with upright post basic.

Near the column of cantilever at least one with the main couple flexible connection.

Be provided with counterweight in steel pipe gusseted inboard.

Column place in adjacent cantilever is provided with counterweight.

Main couple is provided with longitudinal gradient, and this gradient can be set to 0.5%.

The construction method of above-mentioned a kind of wharf crane is: this wharf crane crossing highway, river levee, cantilever extend on the river course, this wharf crane is erected at the bridge pier place that is used to make up new railway bridge, and there are an angle in this wharf crane main couple line of centers and river course line of centers, play line parallel in hanging truss and the highway.

Good effect of the present invention is: the present invention is directed to modern large span highway, the especially big bridge body section of railway by water transport disembarkation and traversing in place, a kind of New-Type Wharf loop wheel machine of developing.This wharf crane has not only solved the beam body and has debarked traversing in placely, accounts for the river course again less, and keeps water route, land route unobstructed; This loop wheel machine plays hanging truss when specifically using and main couple can form certain angle, and main couple and bridge longitudinal centerline also can form an angle; Guarantee that transhipment lifting steel case beam is not subjected to the influence of physical features.Simultaneously, also adopt the unidirectional hinged and counterweight means of gusseted in design, improved the structure stress characteristic.Total longitudinally is provided with 0.5% longitudinal gradient, reduces the amount of deflection of cantilever end when lifting; Cantilever is that main couple front end and column, a steel pipe gusseted constitute, and its lower end and upright post basic are hinged, and other columns are captiveed joint with upright post basic, and counterweight, also is the unbalanced moment when lifting by crane steel case beam for balance; For be not limited in steel case beam when lifting truss on scratch, be set to bascule at truss and second near between the column of cantilever, promptly column is a compressed structure, does not participate in stressed when scratching on truss.Multiple spot is provided with counterweight, and the one, in order to reduce the difficulty that single-point is provided with counterweight; The 2nd, the caused chord member internal force of hogging moment that has produced when counterweight has reduced owing to lifting is set in three corner bracing inboards, improved the strained condition of structure.Harbour cross over river levee, highway directly with the handling of beam body to highway pavement, be transported to the bridge location place by chassis, the spelling platform has been saved the time greatly, has improved work efficiency.Not only solve the beam body and debarked traversing in placely, accounted for the river course again less, and kept water route, land route unobstructed.

Description of drawings:

Fig. 1 wharf crane structural representation of the present invention.

Fig. 2 wharf crane cantilever of the present invention lower end and the hinged scheme drawing of upright post basic.

Fig. 3 wharf crane column of the present invention and main couple movable connection structure scheme drawing.

Fig. 4 wharf crane of the present invention makes up scheme drawing.

Fig. 5-Fig. 8 wharf crane quadravalence of the present invention operating mode scheme drawing.

The specific embodiment:

Describing embodiments of the present invention in conjunction with the accompanying drawings, only be convenient to understand summary of the invention specific embodiment, is not the restriction to protection domain.

A kind of wharf crane, comprise fixedly suspension centre, overhead traveling crane walking system that many group columns 1 and corresponding upright post basic 2, main couple 3, a hanging truss 4, winch tackling system, assembly pulley are formed, also include cantilever 5, this cantilever 5 is that main couple front end and column, a steel pipe gusseted 52 constitute, its lower end and upright post basic are hinged, and other columns are captiveed joint with upright post basic.Second column and the main couple near cantilever flexibly connects.Be provided with counterweight 6 in steel pipe gusseted inboard.Also be provided with counterweight at second the column place simultaneously near cantilever.Main truss sets up longitudinal gradient, and this gradient can be set to 0.5%.The construction method of above-mentioned a kind of wharf crane is: this wharf crane crossing highway, river levee, cantilever extend on the river course, this wharf crane is erected at the bridge pier place that is used to make up new railway bridge, and there are an angle α in this wharf crane main couple line of centers and river course line of centers, play line parallel in hanging truss and the highway.

In conjunction with Fig. 5-quadravalence operating mode shown in Figure 8, the following specifically describes load and calculate and the computational analysis of harbour operating mode internal force.

1, calculate load:

The primary load of harbour main couple comprises steel case beam weight, plays hanging truss and tackling system weight, plays hanging truss running mechanism weight and main couple deadweight.

Full-bridge steel case beam is divided into 62 sections, standard beam segment length 12m wherein, totally 46 sections, 8 sections of standard beam section top, base plate thickenings, 4 sections of special facture beam sections, 4 sections of steel reinforced concrete adapter sections.Lifting weight segmentation statistics is as shown in the table:

Steel case beam lifting quantity statistics table

Classification	Category-A beam section	Category-B beam section	C class beam section	D class beam section	E class beam section	The steel reinforced concrete adapter section
							Numbering
	1#	2#、28#	3#、27#	4#～26#	29#	——
							Quantity	2	4	4	46	2	4
Lifting weight	75.4t	204.7t	182.5t	174.9t	145.5t	142.3t

Harbour calculates load and gets the maximum lift heavy of steel case beam (considering 1.2 coefficient of impact):

G ₁＝205t

Crane truss and accessory structure: G ₂=86.4t

Running mechanism is heavy: G ₃=39.4t

∑G＝1.2G ₁+G ₂+G ₃＝1.2×205+86.4+39.4＝371.8t

The deadweight of harbour main couple is counted automatically by system.

2, harbour calculates

Harbour calculates and adopts the algor93 finite element analysis software, sets up space-truss model.

Following tabular has gone out several major control operating modes.Capsizing moment during for the balanced cantilever maximum, column place inboard at three corner bracings and the 3rd close cantilever has increased the 60t counterweight.

Operating mode one: the most unfavorable processing condition of lifting steel case beam, load center cantilever length 14m.This moment three corner bracings (pressurized) and first near the stressed maximum of the column of cantilever inboard pricncipal rafter (tension).This moment capsizing moment $\mathrm{Mq}=\frac{\mathrm{\ΣG}}{2}L=\frac{371.8}{2}\×14=2602.6t\·m.$

Main operating mode internal force table

Numbering	R1	R2	R3	R4	R5	R6	R7	R8	R9	Diagonal brace	The sign rod member
												Operating mode one	382t			8.9t	11.2t					220.6t	117.7t
Operating mode two	124t	157t	68t	45.2t	22.1t						42t
												Operating mode three				96t	122.2t	61t	37t				58t
Operating mode four						76t	105t	56.6t	14t		58.3t

Balancing torque by the counterweight generation: M _P1=P (L ₁+ L ₂)=60 * (13+33)=2760tm

Balancing torque by the truss generation: M _P2=G _hL ₃=25 * 27=675tm

Safety factor: K=(M _P1+ M _P2)/M _q=(2760+675)/2602.6=1.32

Near operating mode two: play hanging truss and run to second near the column of cantilever, second the column pressurized near cantilever.This moment is because the part vertical rod that concerns main couple and the brace of counterweight are stressed bigger.

Operating mode three: a hanging truss runs to the column and the 4th of the 3rd close cantilever near between the column of cantilever, and last lower boom is stressed not to be controlled, and it is stressed bigger to be mainly near the brace of column.

Operating mode four: a hanging truss runs to the column and the 5th of the 4th close cantilever near between the column of cantilever, and near the brace last lower boom and the column is stressed all bigger.

Claims (5)

1, a kind of wharf crane, comprise fixedly suspension centre, overhead traveling crane walking system that many group columns and corresponding upright post basic, main couple, a hanging truss, winch tackling system, assembly pulley are formed, it is characterized in that: also include cantilever, this cantilever is that main couple front end and column, a steel pipe gusseted constitute, the column of adjacent cantilever and main couple flexibly connect, and multiple spot is provided with counterweight, and its lower end and upright post basic are hinged, and other columns are captiveed joint with upright post basic; Play hanging truss and main couple and can form certain angle, main couple and bridge longitudinal centerline also can form an angle.

2, a kind of wharf crane of stating as claim 1 is characterized in that: be provided with counterweight in steel pipe gusseted inboard.

3, a kind of wharf crane of stating as claim 1 is characterized in that: the column place in adjacent cantilever is provided with counterweight.

4, a kind of wharf crane of stating as claim 1 or 2 or 3, it is characterized in that: main couple is provided with longitudinal gradient, and this gradient can be set to 0.5%.

5, the construction method as the described a kind of wharf crane of each claim of claim 1-4 is: this wharf crane crossing highway, river levee, cantilever extend on the river course, this wharf crane is erected at the bridge pier place that is used to make up new railway bridge, and there are an angle in this wharf crane main couple line of centers and river course line of centers, play line parallel in hanging truss and the highway.

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