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 a column, 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.
The place is provided with counterweight at column.
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 this wharf crane vacation 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: this present invention is also traversing in place by the water transport disembarkation at modern large span highway, the especially big bridge body section of railway, 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 a column, 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 two on column, 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 bridge location place spelling platform by chassis, saved the time greatly, 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 a column 51, steel pipe gusseted 52 constitute, its lower end and upright post basic 2 are hinged, and other columns 1 are captiveed joint with upright post basic 2.Column 2 near cantilever flexibly connects with main couple 3.Be provided with counterweight 6 in steel pipe gusseted 52 inboards.Also be provided with counterweight at column 2 places 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 this wharf crane vacation 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.
Several major control operating modes have been listed as Fig. 2.Capsizing moment during for the balanced cantilever maximum has increased the 60t counterweight in three corner bracings inboard and column three places.
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 the stressed maximum of column one inboard pricncipal rafter (tension).This moment capsizing moment
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 the column two column two pressurizeds.This moment is because the part vertical rod that concerns main couple and the brace of counterweight are stressed bigger.
Operating mode three: play hanging truss and run between column three and the column four, 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: play hanging truss and run between column four and the column five, near the brace last lower boom and the column is stressed all bigger.