CN112609574A

CN112609574A - Construction method for temporarily fixing complex steel box girder with through-length stiffening rib at high altitude

Info

Publication number: CN112609574A
Application number: CN202011281778.6A
Authority: CN
Inventors: 李鹏; 张海礁; 陶福兵; 刘飞
Original assignee: MCC Shanghai Steel Structure Technology Co Ltd
Current assignee: MCC Shanghai Steel Structure Technology Co Ltd
Priority date: 2020-11-16
Filing date: 2020-11-16
Publication date: 2021-04-06

Abstract

The invention relates to a construction method for temporarily fixing a complex steel box girder with a through long stiffening rib at high altitude, which comprises the following steps: the upper flange stiffening rib at the high-altitude butt joint position of the steel box girder installed firstly is externally raised by a certain length La relative to the upper flange subsection; the lower flange stiffening rib sectionally retracts La relative to the lower flange; II, secondly: the upper flange stiffening rib at the high-altitude butt joint position of the rear-mounted steel box girder is sectionally retracted by a certain length La relative to the upper flange; the lower flange stiffening rib expands La outwards in a subsection way relative to the lower flange; thirdly, the method comprises the following steps: the La length is obtained by calculation, and the stress requirement is required to be met; fourthly, the method comprises the following steps: stress holes are arranged at the sectional positions of the upper flange and the lower flange of the steel box girder by the full-length stiffening ribs; fifthly: the welding of the segmented positions of the full-length stiffening ribs adopts equal-strength butt joint. The invention ensures the reliable connection of the nodes in the butt joint process of the steel box girder, simultaneously reduces the use of temporary fixing measures as much as possible, reduces unnecessary welding and cutting work by the idea of equivalent substitution and permanent combination, achieves the effects of energy saving and environmental protection, and meets the design requirements.

Description

Construction method for temporarily fixing complex steel box girder with through-length stiffening rib at high altitude

Technical Field

The invention relates to the field of steel structure installation and construction, in particular to a construction method for temporarily fixing a complex steel box girder with a full-length stiffening rib at high altitude.

Background

The traditional steel box girder is hoisted on site and temporarily put in place, a clamping plate is generally arranged at the butt joint opening of the steel box girder, the rear-mounted steel box girder falls on the front steel box girder through the clamping plate when being butted at high altitude, and the clamping plate and the front rod piece are welded and fixed after being adjusted to be put in place. According to the method, the clamping plate needs to be welded on the rod piece on the ground or in a factory in advance, and the clamping plate needs to be cut after the rod piece is welded in place. Although the temporary clamping plate is widely used, the temporary fixing problem during butt joint of rod pieces can be solved, the problems of material consumption of measures except a structural body, environmental pollution in an additional welding process, possible base material damage in the cutting process of the clamping plate and the like are often caused in the using process of the temporary clamping plate.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provides a construction method for temporarily fixing a complex steel box girder with a full-length stiffening rib at high altitude, which reduces additional processes, eliminates additional energy consumption pollution and achieves the effects of shortening the construction period, saving energy and protecting environment.

In order to solve the technical problem, the invention is realized as follows:

a construction method for temporarily fixing a complex steel box girder with a through-length stiffening rib at high altitude is characterized by comprising the following steps:

the method comprises the following steps: by reasonable segmentation, the upper flange stiffening rib at the high-altitude butt joint position of the steel box girder is externally raised by a certain length La relative to the upper flange segmentation by utilizing the staggered lap joint of the structure; the lower flange stiffening rib sectionally retracts La relative to the lower flange;

step two: the upper flange stiffening rib at the high-altitude butt joint position of the rear-mounted steel box girder is sectionally retracted by a certain length La relative to the upper flange; the lower flange stiffening rib expands La outwards in a subsection way relative to the lower flange;

step three: the La length is obtained by calculation, and the stress requirement is required to be met;

step four: stress holes are arranged at the sectional positions of the upper flange and the lower flange of the steel box girder by the full-length stiffening ribs;

step five: the welding of the segmented positions of the full-length stiffening ribs adopts equal-strength butt joint.

The invention has the beneficial effects that: the clamping horse plate is very commonly used in the temporary fixation of the high-altitude butt joint of the conventional steel box girder, the structural structure of the steel box girder does not need to be considered, and the steel plate is only welded on the upper flange base metal and the lower flange base metal of the steel box girder by measures and is cut off after being used. However, the invention is based on the premise that the steel box girder crosses the municipal road and the requirement of green construction is high, compared with the fixation of the traditional clamping horse plate, the reasonable stiffening rib structure segmentation of the steel box girder can effectively avoid the problems of material loss, welding pollution, base metal damage and the like caused by the use of temporary construction measures, and the additional risk caused by the measure materials and the prolongation of the construction period are avoided by technological means. Brings convenience to site operation and conforms to the concept of green construction.

By the idea of equivalent replacement and permanent combination, through reasonable segmentation of the steel box girder structure body, parts in the steel box girder structure replace a clamping plate, additional processes are reduced, additional energy consumption pollution is eliminated, and the effects of shortening construction period, saving energy and protecting environment are achieved.

The method and the device have the advantages that the reasonable segmentation is carried out on the complex steel box girder with the full-length stiffening ribs, the basis is provided for the construction of similar structures, and the method and the device have wide guiding significance under the trends of energy conservation, emission reduction and green construction.

Drawings

The invention is described in further detail below with reference to the following figures and embodiments:

FIG. 1 is a sectional view of a steel box girder lower flange full-length stiffening rib;

FIG. 2 is a sectional view of the upper flange through long stiffening rib of the steel box girder;

FIG. 3 is a sectional node diagram of a steel box girder through long stiffening rib.

Detailed Description

As shown in fig. 1-3: a construction method for temporarily fixing a complex steel box girder with a through-length stiffening rib at high altitude comprises the following steps:

the method comprises the following steps: the upper flange stiffening rib 3 at the high-altitude butt joint position of the steel box girder 1 is sectionally and externally raised by a certain length La relative to the upper flange 2 by reasonable subsection and by utilizing the staggered lap joint of the structure; the lower flange stiffening rib 5 is sectionally retracted into La relative to the lower flange 4;

step two: the upper flange stiffening rib 8 at the high-altitude butt joint position of the rear-mounted steel box girder 6 is sectionally retracted by a certain length La relative to the upper flange 7; the lower flange stiffening rib 10 expands La outwards in sections relative to the lower flange 9;

step four: stress holes 11 are formed in the segmented positions of the upper flange 2, the lower flange 4, the upper flange 7 and the lower flange 9 of the steel box girder through the long stiffening ribs;

Claims

1. A construction method for temporarily fixing a complex steel box girder with a through-length stiffening rib at high altitude is characterized by comprising the following steps:

the method comprises the following steps: the upper flange stiffening rib (3) at the high-altitude butt joint position of the steel box girder (1) is sectionally and externally raised by a certain length La relative to the upper flange (2) by reasonable subsection and by utilizing the staggered lap joint of the structure; the lower flange stiffening rib (5) is sectionally retracted into the La relative to the lower flange (4);

step two: the upper flange stiffening rib (8) at the high-altitude butt joint position of the rear-mounted steel box beam (6) is sectionally retracted by a certain length La relative to the upper flange (7); the lower flange stiffening rib (10) expands La outwards in sections relative to the lower flange (9);

step four: stress holes (11) are arranged at the sectional positions of the upper flange and the lower flange (2, 4, 7 and 9) of the steel box girder by the full-length stiffening ribs;