CN100528731C - Wharf crane and construction method - Google Patents

Abstract

The object of the present invention is to provide a wharf crane with a new structure and its construction method, which meet the segmental transfer needs of modern long-span highways and railway super-large bridges. The invention relates to a wharf crane, comprising a plurality of sets of columns and corresponding column foundations, a main truss, a lifting truss, a winch hoisting system, a fixed lifting point composed of pulley blocks, a crane running system, and a cantilever, the cantilever is the front end of the main truss It is composed of a column and a steel pipe triangular support, the lower end of which is hinged to the column foundation, and the other columns are fixedly connected to the column foundation. At least one column near the cantilever is movably connected with the main truss. A counterweight is arranged on the inner side of the steel pipe triangular support. There is a counterweight at the column. The main truss is provided with longitudinal slope, which can be set to 0.5%. The construction method of the above-mentioned wharf crane is as follows: the wharf crane spans the road, the embankment, and the cantilever extends to the river, the wharf crane is erected at the pier for building a new railway bridge, and the wharf crane There is an included angle between the centerline of the main truss and the centerline of the river, and the lifting truss is parallel to the centerline of the road.

Description

A dock crane and its construction method

Technical field:

The invention relates to the technical field of segmental transshipment of modern long-span highways and railway super-large bridges, in particular to a wharf crane and a wharf crane that realizes the beam body from the waterway to the shore and laterally moves into place without affecting the waterway and land transportation. build method.

Background technique:

Generally, prefabricated girders are transported by water, and the wharf is usually set up by trestle bridge method, which must occupy the river and affect navigation; and the height of trestle bridges is limited, which cannot meet the needs of transshipment of prefabricated beams across the road. There is no way to meet the transshipment requirements of long-span highways and railway super-large bridge body sections.

Invention content:

The object of the present invention is to provide a new type of wharf crane and its construction method, which can meet the segmental transfer needs of modern long-span highways and railway super-large bridges.

The technical solution adopted to realize the object of the present invention is: a wharf crane, including multiple groups of columns and corresponding column foundations, main trusses, lifting trusses, hoisting systems, fixed lifting points composed of pulley blocks, and a crane traveling system. There is a cantilever. The cantilever is composed of the front end of the main truss and a column and a steel pipe triangular support. The lower end of the cantilever is hinged to the column foundation, and the other columns are fixedly connected to the column foundation.

At least one column near the cantilever is movably connected with the main truss.

A counterweight is arranged on the inner side of the steel pipe triangular support.

A counterweight is provided at the column of the adjacent cantilever.

The main truss sets the longitudinal slope, which can be set to 0.5%.

The construction method of the above-mentioned wharf crane is as follows: the wharf crane spans the road, the embankment, and the cantilever extends to the river, the wharf crane is erected at the pier for building a new railway bridge, and the wharf crane There is an included angle between the centerline of the main truss and the centerline of the river, and the lifting truss is parallel to the centerline of the road.

The positive effect of the present invention is that: the present invention is a new type of wharf crane developed for the modern long-span highway and railway extra-large bridge body segments to be transported ashore by water and moved laterally into place. The wharf crane not only solves the problem of the horizontal movement of the beam body on the shore, but also occupies less water, and keeps the waterway and land unobstructed; when the crane is actually used, the lifting truss and the main truss can form a certain angle, and the main truss and the longitudinal center of the bridge The line can also form a certain angle; to ensure that the transfer and lifting of the steel box girder will not be affected by the terrain. At the same time, the triangular support one-way hinge and counterweight are also used in the design to improve the mechanical characteristics of the structure. The entire structure is longitudinally set with a 0.5% longitudinal slope to reduce the deflection of the cantilever end during hoisting; the cantilever main truss front end is composed of a column and a steel pipe triangular support, its lower end is hinged to the column foundation, and other columns are fixedly connected to the column foundation , and the counterweight are also to balance the unbalanced bending moment when lifting the steel box girder; in order not to limit the upward deflection of the truss when the steel box girder is hoisted, a movable structure is set between the truss and the second column close to the cantilever, that is, the column As a compression-only structure, it does not participate in the force when the truss is deflected. The counterweight is set at multiple points, one is to reduce the difficulty of setting the counterweight at a single point; the other is to set the counterweight inside the triangular brace to reduce the internal force of the chord caused by the negative bending moment generated during lifting, and improve the structure. stress state. The wharf crosses the embankment and the highway to directly hoist the beam body to the road surface, transport it to the bridge position by trolley, and assemble the platform, which greatly saves time and improves work efficiency. It not only solves the problem of the horizontal movement of the beam body on the bank, but also occupies less river channels, and keeps the water and land routes unobstructed.

Description of drawings:

Fig. 1 is a structural schematic diagram of a wharf crane of the present invention.

Fig. 2 is a schematic diagram of the hinged connection between the lower end of the cantilever of the wharf crane of the present invention and the foundation of the column.

Fig. 3 is a schematic diagram of the movable connection structure between the upright column of the wharf crane and the main truss of the present invention.

Fig. 4 is a schematic diagram of the construction of the wharf crane of the present invention.

Figures 5-8 are schematic diagrams of the fourth-order working conditions of the wharf crane of the present invention.

Detailed ways:

The embodiments of the present invention are described in conjunction with the drawings, which are only for understanding the specific implementation examples of the content of the invention, and are not intended to limit the scope of protection.

A wharf crane, comprising a plurality of sets of columns 1 and corresponding column foundations 2, a main truss 3, a lifting truss 4, a hoisting system, a fixed lifting point composed of pulley blocks, a crane running system, and a cantilever 5, the cantilever 5 The front end of the main truss is composed of a column and a steel pipe triangular support 52, the lower end of which is hinged to the column foundation, and the other columns are fixedly connected to the column foundation. The second column near the cantilever is flexibly connected with the main truss. A counterweight 6 is provided on the inner side of the steel pipe triangular support. Simultaneously, a counterweight is also provided at the second column near the cantilever. The longitudinal slope of the main truss can be set to 0.5%. The construction method of the above-mentioned wharf crane is as follows: the wharf crane spans the road, the embankment, and the cantilever extends to the river, the wharf crane is erected at the pier for building a new railway bridge, and the wharf crane There is an included angle α between the centerline of the main truss and the centerline of the river, and the lifting truss is parallel to the centerline of the road.

Combined with the fourth-order working conditions shown in Figures 5-8, the following describes the load calculation and the calculation and analysis of the internal force of the wharf condition in detail.

1. Calculate the load:

The main load of the main truss of the wharf includes the weight of the steel box girder, the weight of the lifting truss and the lifting system, the weight of the running mechanism of the lifting truss and the self-weight of the main truss.

The steel box girder of the whole bridge is divided into 62 sections, of which the standard beam section is 12m long, 46 sections in total, 8 sections are thickened on the top and bottom of the standard beam section, 4 sections are specially made, and 4 sections are combined with steel and concrete. The statistics of hoisting weight by segment are shown in the table below:

Statistical table of steel box girder hoisting quantity

Classification Class A beam segment Class B beam segment Class C beam segment Class D beam segment Class E beam segment Steel-concrete joint section serial number 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

The calculation load of the wharf is taken from the maximum hoisting weight of the steel box girder (considering the impact coefficient of 1.2):

G ₁ =205t

Crane truss and auxiliary structures: G ₂ =86.4t

Weight of traveling mechanism: G ₃ =39.4t

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

The self-weight of the main truss of the wharf is automatically calculated by the system.

2. Wharf calculation

The wharf calculation uses algor93 finite element analysis software to establish a space truss model.

The following table lists several main control conditions. In order to balance the overturning moment when the cantilever is at its maximum, a 60t counterweight is added to the inner side of the triangular brace and the third column near the cantilever.

Working condition 1: the most unfavorable working condition for lifting the steel box girder, the cantilever length of the load center is 14m. At this time, the triangular brace (under compression) and the upper chord (under tension) of the inner truss of the first column close to the cantilever bear the maximum force. overturning moment $Q=\frac{\mathrm{\ΣG}}{2}L=\frac{371.8}{2}\×14=2602.6t\·m.$

Main working condition internal force table

serial number R1 R2 R3 R4 R5 R6 R7 R8 R9 Diagonal brace Identification bar Working condition one 382t 8.9t 11.2t 220.6t 117.7t Working condition two 124t 157t 68t 45.2t 22.1t 42t Working condition three 96t 122.2t 61t 37t 58t Working condition four 76t 105t 56.6t 14t 58.3t

Balance moment generated by counterweight: M _p1 =P(L ₁ +L ₂ )=60×(13+33)=2760t·m

The balance moment generated by the truss: M _p2 = G _h L ₃ = 25×27=675t·m

Safety factor: K＝(M _p1 +M _p2 )/M _q ＝(2760+675)/2602.6＝1.32

Working condition 2: The hoisting truss moves to the vicinity of the second column close to the cantilever, and the second column close to the cantilever is under pressure. At this time, due to the relationship between the counterweight, some of the vertical rods and oblique rods of the main truss are relatively stressed.

Working condition 3: The hoisting truss runs between the third column close to the cantilever and the fourth column close to the cantilever. The force on the upper and lower chords is not controlled, mainly because the force on the inclined bar near the column is relatively large.

Working condition 4: The hoisting truss runs between the fourth column close to the cantilever and the fifth column close to the cantilever, and the upper and lower chords and the oblique bars near the column are stressed.

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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