CN100519948C - Construction method for large-scale overhanging beam - Google Patents

Construction method for large-scale overhanging beam Download PDF

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Publication number
CN100519948C
CN100519948C CNB2007101575858A CN200710157585A CN100519948C CN 100519948 C CN100519948 C CN 100519948C CN B2007101575858 A CNB2007101575858 A CN B2007101575858A CN 200710157585 A CN200710157585 A CN 200710157585A CN 100519948 C CN100519948 C CN 100519948C
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plate
main
panel
construction
welding
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CN101148869A (en
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孙洪国
杨清松
孙瑞雪
赵绪杰
黄天颖
李俊玲
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Dalian Shipbuilding Industry Co Ltd
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Dalian Shipbuilding Industry Co Ltd
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Abstract

The process of constructing large cantilever beam includes the following steps: setting the main web plate horizontally and welding to the lower face plate; turning the main web plate by 90 deg and welding the supporting boards to the main web plate and the lower face plate to form one composite body; setting two composite bodies oppositely; welding side plate between two composite bodies; welding pipe support to the side plate to form the main girder structure; turning the main girder structure by 90 deg; connecting two main girder structures; assembling the lower platform with pipe support to the lengthened main girder structure; assembling the other main girder structure and the top platform; and assembling the lower drafting board. The process is reasonable and efficient, and has saving in cost and short building period, and the large cantilever beam has high precision and great bearing capacity.

Description

Construction method for large-scale overhanging beam
Technical field
The present invention relates to a kind of construction method of beam frame structure, more particularly, relate to the construction method of the medium-and-large-sized semi girder of offshore boring island.
Background technology
Semi girder is positioned on the offshore boring island stern deck, is the bearing structure of boring tower, rig floor, rig floor tower base etc., and it is made up of two girders and the platform and the truss that connect them.In use, require it can carry outside slippage such as the drilling equipment that comprises boring tower, and rig floor laterally slippage to the left and right.The domestic semi girder of once building and transforming some small-sized offshore boring island, the size of these offshore boring island is less, and operating depth is also less.Compare greater than 2000 tons large-scale overhanging beam with supporting capacity, technical requirements is lower.Build for large-scale semi girder, require under the very strict situation, need to adopt a kind of rational and effective technological process,, guarantee the precision and the structural strength of semi girder saving cost, reducing on the basis of construction period at finish size.
Summary of the invention
The present invention is directed to large-scale overhanging beam required precision height, supporting capacity requires under the big prerequisite, a kind of construction method of large-scale overhanging beam is provided, its purpose aims to provide a kind of rational and effective job practices, with the reduction that reaches large-scale overhanging beam construction cost and the shortening of construction period.
In order to address the above problem the large-scale overhanging beam that the present invention has designed a cover construction method for large-scale overhanging beam and utilized this method to build.Wherein, large-scale overhanging beam comprises side plate and platform.Side plate comprises main compound plate, the intermediate plate between the master's compound plate of both sides, and the lower panel and the gripper shoe of the welding of the main compound plate outside.Welded pipe is propped up and is configured to main beam structure on side plate, assembly layer platform between the main beam structure of the left and right sides.The construction method of large-scale overhanging beam of the present invention comprises the steps:
1,, and welds with lower panel with main compound plate horizontal positioned;
2, main compound plate is turned over turn 90 degrees, lower panel is positioned at the below, and gripper shoe is welded on main compound plate and the lower panel;
3, repeating step 1,2 constitutes another complex that is made of main compound plate, lower panel, gripper shoe; Twice complex upset is opposed, and lower panel toward the outer side; The welding intermediate plate constitutes side plate between the main compound plate of twice complex;
4, welded pipe is propped up and is configured to main beam structure on side plate; Main beam structure integral body turned over turn 90 degrees, make side lower panel horizontal down;
5, repeating step 1-4 obtains the multistage main beam structure, with two sections main beam structure splicing lengthenings; And be that benchmark utilizes pipe holder assembling underlying platform with the main beam structure of side lengthening;
6, the main beam structure of assembling opposite side, and finally assemble the top layer platform.
7, close up the towing plate that finishes semi girder lower edge in bulk side, back at semi girder.
Above-mentioned construction method for large-scale overhanging beam, its improvement be, in step 4, on side plate the welded pipe support adopt be symmetrically welded, the welding technique of segmentation skip welding and backstep welding.Between step 5,6, also comprise assembling intermediate layer platform, utilize intermediate layer platform and underlying platform detection platform straightness accuracy, and then weld assembling after proofreading and correct straightness accuracy.In addition, before the welding lower panel, lower panel is imposed the work step of precompressed anti-deformation.
The present invention is by providing the construction method of a cover large-scale overhanging beam, thereby satisfies large-scale overhanging beam precision height, requirement that supporting capacity is big, and this job practices has rationally effectively, save construction cost, shorten the advantage of construction period.
Description of drawings
Fig. 1 is the process flow chart of construction method for large-scale overhanging beam of the present invention;
Fig. 2 imposes precompressed deformed configurations schematic diagram at lower panel in the construction method for large-scale overhanging beam of the present invention.
The specific embodiment
Shown in i figure among Fig. 1, the large-scale overhanging beam that the present invention built comprises side plate 7 and platform 6.Wherein, side plate 7 comprises the intermediate plate 4 between main compound plate 1, the both sides master's compound plate 1, and the lower panel 2 and the gripper shoe 3 of the welding of main compound plate 1 outside; In addition, welded pipe support 5 constitutes main beam structure on the side plate 7, assembling 1-3 layer platform 6 between the main beam structure of the left and right sides.
Little figure with reference among the figure 1 illustrates construction method for large-scale overhanging beam of the present invention one by one.Wherein,
1, shown in the figure a, with main compound plate 1 horizontal positioned, and with lower panel 2 welding.
2, figure a is to scheming b, main compound plate 1 turned over turn 90 degrees, and lower panel 2 is positioned at the below, and gripper shoe 3 is welded on main compound plate 1 and the lower panel 2.
3, figure c is to scheming d, and repeating step 1,2 constitutes another complex that is made of main compound plate 1, lower panel 2, gripper shoe 3; Twice complex upset is opposed, and lower panel 2 toward the outer side; Welding intermediate plate 4 constitutes side plate 7 between the main compound plate 1 of twice complex.
4, referring to scheming e to scheming f, welded pipe support 5 constitutes main beam structures on side plate 7; Main beam structure integral body turned over turn 90 degrees, make a side lower panel 2 horizontal down; On its latus inframedium 7 welded pipe support 5 adopt be symmetrically welded, the welding technique of segmentation skip welding and backstep welding.
5,, repeat the 1-4 step and obtain the multistage main beam structure, two sections main beam structure splicing lengthenings as figure g; At this moment, vertical big group right side girder, postwelding is checked the straightness accuracy of girder again, if deviation is arranged, should in time correct.
Then, as figure h, the main beam structure that extends with the right side is that benchmark utilizes pipe holder 5 assembling underlying platforms 6, and at this moment, platform is one-sided holding state
6, as figure i, assembling left side main beam structure, and carry out welding job behind the centering straightness accuracy again, its process is that assembling intermediate layer platform utilizes intermediate layer platform and underlying platform detection platform straightness accuracy, and then welds assembling after proofreading and correct straightness accuracy.After this, as figure j, assembling top layer platform 6, immediate shipment pipe arrangement frame deck.
7, close up the towing plate 10 that finishes semi girder lower edge in bulk side, back at semi girder.
The present invention is mainly by the upright order of unique group, and to reach in the strict grade aspect the completion precision, it has also brought very big convenience for organizing construction simultaneously.Its construction main points are as follows
1, in the making of semi girder master riser, for reduce the influence of welding deformation as far as possible, we have selected special welding method for use, and have formulated special welding sequence, the assurance that this is strong this semi girder dimensional accuracy of building.
2, the deflection degree of semi girder lower panel requires also very strictness, as shown in Figure 2.To this, before construction, carried out the welding deformation test at the angularity of compound plate, forge the measure that panel is suitably taked the precompressed anti-deformation according to test, use suitable assembling and welding method to be controlled in addition.
The installation accuracy of the towing plate 10 of 3 semi girder lower edge sides is had relatively high expectations, and especially the bilateral symmetry perforate must not be greater than 3 millimeters in the tolerance of semi girder length direction, and it is in bulk therefore to require it to go after semi girder closes up end again.
4 owing to semi girder required precision strictness (18 meters width at width, error is 3 millimeters), therefore control is got up very thorny, therefore after we have taked main hull structure and the moulding of cantilever beam structures difference, the method that mapping is in time revised mutually, formulate rational assembly method by us, it is feasible that this scheme is become.
5, adopt method of the present invention, can reach following accuracy class,
Semi girder is quite high to required precision on finish size, the tolerance of length direction is ± 1.5mm, the tolerance of width is ± 3mm that the width tolerance of semi girder lower panel T section bar requires to be+1.6/-0.8mm that the angularity tolerance of lower panel width is ± 1.6mm.The vertical distortion of complete semi girder must not be greater than 1.7mm/10000mm, and total deformation must not be greater than 5.7mm.The distortion of complete semi girder side direction must not be greater than 3.3mm/10000mm, and total deformation must not be greater than 11.3mm.
6, the present invention has mainly adopted the structure at bilateral symmetry position to go up tire simultaneously on assembly method, is constructed simultaneously by same construction team, and is identical with the assembling and the welding method that guarantee them.On the assembly method of whole semi girder, we have designed simple and direct, an effective scheme, and it is particularly suitable for the construction of large scale semi girder, and this scheme makes assembling more convenient, and quality is more guaranteed.
The above; only be the preferable specific embodiment of the present invention; but protection scope of the present invention is not limited thereto; anyly be familiar with those skilled in the art in the technical scope that the present invention discloses; be equal to replacement or change according to technical scheme of the present invention and inventive concept thereof, all should be encompassed within protection scope of the present invention.

Claims (4)

1, a kind of construction method for large-scale overhanging beam is characterized in that, wherein semi girder comprises side plate (7) and platform (6), and described side plate (7) comprises main compound plate (1), lower panel (2), gripper shoe (3) and intermediate plate (4), and its construction method comprises the steps:
S1, with main compound plate (1) horizontal positioned, and weld with lower panel (2);
S2, main compound plate (1) turned over turn 90 degrees, lower panel (2) is positioned at the below, and gripper shoe (3) is welded on main compound plate (1) and the lower panel (2);
S3, repetition S1, S2 constitute another complex that is made of main compound plate (1), lower panel (2), gripper shoe (3); Twice complex upset is opposed, and lower panel (2) toward the outer side; Between the main compound plate (1) of twice complex, weld intermediate plate (4) and constitute side plate (7);
S4, go up welded pipe support (5) at side plate (7) and constitute main beam structure; Main beam structure integral body turned over turn 90 degrees, make a side lower panel (2) horizontal down;
S5, repetition S1-S4 step obtain the multistage main beam structure, with two sections main beam structures splicing lengthenings; And be that benchmark utilizes pipe holder (5) assembling underlying platform (6) with the main beam structure of side lengthening;
The main beam structure of S6, assembling opposite side, and finally assemble top layer platform (6);
S7, close up the towing plate (10) that finishes semi girder lower edge in bulk side, back at semi girder.
2, construction method for large-scale overhanging beam according to claim 1 is characterized in that, in step S4, side plate (7) go up welded pipe support (5) adopt be symmetrically welded, the welding technique of segmentation skip welding and backstep welding.
3, construction method for large-scale overhanging beam according to claim 1 is characterized in that, in step S6, also comprises assembling intermediate layer platform, utilizes intermediate layer platform and underlying platform detection platform straightness accuracy, and then welds assembling after proofreading and correct straightness accuracy.
4, according to the arbitrary described construction method for large-scale overhanging beam of claim 1-3, it is characterized in that, at welding lower panel (2) before, lower panel (2) is imposed the work step of precompressed anti-deformation.
CNB2007101575858A 2007-10-18 2007-10-18 Construction method for large-scale overhanging beam Active CN100519948C (en)

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Application Number Priority Date Filing Date Title
CNB2007101575858A CN100519948C (en) 2007-10-18 2007-10-18 Construction method for large-scale overhanging beam

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CN100519948C true CN100519948C (en) 2009-07-29

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Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101806053B (en) * 2010-05-17 2014-10-08 大连船舶重工集团有限公司 Integral installation method of cantilever beams of self lifting type well drilling platform
CN103862235B (en) * 2014-02-26 2016-03-30 招商局重工(江苏)有限公司 A kind of preparation method of self-elevating drilling platform cantilever beam track
CN104943819B (en) * 2014-03-25 2017-06-16 上海外高桥造船有限公司 Cantilever beam two-part method of construction
CN104802924B (en) * 2014-05-27 2018-04-03 烟台中集来福士海洋工程有限公司 Cantilever beam top layer pipe deck and its method of construction
CN106475741B (en) * 2016-10-20 2018-11-09 南通振华重型装备制造有限公司 A kind of self-elevating drilling platform cantilever beam pushing-pulling-rack building technology
CN108311804B (en) * 2017-01-16 2020-11-06 烟台中集来福士海洋工程有限公司 Girder construction method of self-elevating platform cantilever beam
CN108487213B (en) * 2018-03-16 2019-11-15 南通振华重型装备制造有限公司 A kind of self-elevating drilling platform cantilever beam girder method of construction
CN111571054B (en) * 2020-05-22 2021-12-28 浙江东南网架股份有限公司 Method for processing multi-cavity steel plate shear wall unit body

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