CN102493349B - Method for prefabricating and erecting box girders by using bailey beam - Google Patents

Abstract

The invention discloses a prefabricated box girder erection construction method using Bailey girders. The abutment cap is erected on the side span abutment of the first span, and the first and second abutment caps are respectively erected on the two side piers of the second span. Bridge pier cover beams: At least two support pad stones are arranged at intervals on the abutment cap, the first and second pier cover beams respectively, and then on the abutment cap, the first and second bridge pier cover Longitudinally erect a Bailey beam; install a pedestal on the Bailey beam; prepare the first box girder of the first and second spans on the pedestal; place the prepared first and second spans of the first box girder from Move the pedestal of the Bailey beam to the first and second spans for installation until all the box girders except the Bailey beam are installed; prepare the box girder at the Bailey beam position and place the box girder adjacent to the Bailey beam On the box girder at the position; remove the Bailey beam and install the box girder at the Bailey beam position. The method improves labor production efficiency.

Description

A construction method of box girder prefabricated erection using Bailey beam

technical field

The invention relates to a construction method for prefabricated erection of box girders, in particular to a construction method for prefabricated erection of box girders by using Bailey beams.

Background technique

In bridge construction, prefabricated box girder is the most commonly used bridge superstructure form in bridge construction. Currently, prestressed concrete continuous rigid frame bridges spanning deep valleys, large rivers and rapids. The piers of the main bridge of the lower structure adopt hollow thin-walled piers and pile foundations, and the main bridge of the upper structure adopts the construction method of cantilever pouring, while the upper structure of the approach bridge mostly adopts post-tensioning prestressed box girder. For the prefabrication of a large number of box girders in the prefabrication field, it is a common method to erect the construction in sequence according to the order of the girders. For the case of a small number of box girders, the terrain at the approach bridge has large elevation differences, and the terrain is complex. The prefabricated box girder and erection method in the prefabrication yard are relatively difficult to construct and economically unreasonable.

Authorized patents obtained by searching:

1 The Chinese patent application number CN201010232662.3 discloses "installation method of post-tensioned prefabricated prestressed concrete box girder", and the present invention relates to an installation method of post-tensioned prefabricated prestressed concrete box girder. The installation method of post-tensioned prefabricated prestressed concrete box girder is characterized in that it comprises the following steps: 1) installation of supporting device: in a prestressed tendon tension section, lay along the direction that post-tensioned prefabricated prestressed concrete box girder is installed The first support frame and the second support frame, the first slideway is laid on the first support frame, and the second slideway is laid on the second support frame; 2) The installation of the post-tensioned prefabricated prestressed concrete box girder: ① adopt lifting A gantry crane with a weight of 100t lifts 5-12 post-tensioned precast prestressed concrete box girders and places them on the first slideway and the second slideway of the support device; Walking on the slideway and the second slideway assembles two adjacent post-tensioned prefabricated prestressed concrete boxes.

2 The Chinese patent with the application number: CN201010285591.3 discloses "a construction method for high-altitude segmental prefabrication, moving, storage, and assembly of a large concrete box girder". The present invention discloses a high-altitude segmental The construction method of prefabrication, moving beams, storing beams, and assembling is characterized in that it includes the following steps: 1) erecting a high-pile prefabricated platform; 2) erecting a beam-moving steel pipe support and a steel slide rail between the high-piled prefabricated platform and the pier; 3. ) pouring the matching beam section on the high pile prefabricated platform; 4) using the poured matching beam section as the end formwork of one end of the next new beam section to be poured, and pouring the new beam section; 5) after the new beam section is poured, place the The matching beam segment is transported to the design position as the beam segment to be assembled, and the new beam segment is moved forward as the next matching beam segment; 6) The beam segment to be assembled is moved longitudinally to the matching surface at the end of the assembled beam segment as the assembled beam segment, and the assembled beam is adjusted The position of the segment makes it meet the requirements for splicing with the already spliced beam segment on the pier; 7) splicing the assembled beam segment with the spliced beam segment. The construction method of the present invention effectively enables the prefabricated beam section to complete most of the shrinkage deformation of the beam body in a free state through the segmental prefabrication of the beam section and the long-term storage of the beam, and eliminates the shrinkage difference of adjacent beam sections due to different ages , thereby eliminating cracks.

The patent "installation method of post-tensioned prefabricated prestressed concrete box girder" disclosed in the first patent is not suitable for bridges in valleys and rivers with large terrain height difference and complex terrain.

The invention purpose of the construction method of box girder high-altitude segmental prefabrication, moving beams, storing beams and assembling disclosed in the second patent is to eliminate cracks.

Contents of the invention

An object of the present invention is to overcome the deficiencies in the prior art, to provide a kind of method for prefabricated erection of box girders using Bailey beams when the terrain height difference is large and the terrain is complex, and the method improves labor production efficiency and saves The cost is reduced and the construction period is saved.

A kind of utilization Bailey beam of the present invention carries out box girder prefabricated erection construction method, it comprises the following steps:

(1) Erect the abutment cap on the side span abutment of the first span that has been constructed and erect the second pier cap beam and the first pier cap girder respectively on the piers on both sides of the second span that has been constructed;

(2) At least two support pad stones are respectively arranged at intervals on the abutment cap, the first and second pier cap beams, and then one of the abutment caps, the first and the second pier cap girder supports A Bailey beam is erected along the longitudinal length on the cushion stone;

(3) a pedestal is installed on the Bailey beam;

(4) Carry out the preparation of first span and second span first sheet box girder on described pedestal;

(5) Move the prepared first piece of box girder of the first span and the second span from the pedestal of the Bailey beam to the position where the first piece of box girder is placed on the first span and the second span for installation, The two ends of the first piece of box girder in the first span are erected on the supporting pad stones corresponding to the abutment cap and the first pier cover beam, and the two ends of the first piece of box girder in the second span are erected on the first pier Covering beams and second pier cover beams correspondingly set on the supporting pad stone;

(6) Repeat steps (4) and (5) until all box girders except Bailey beam positions are installed;

(7) Prepare the box girder at the Bailey beam position and place the box girder at the Bailey beam position on the box girder adjacent to the Bailey beam;

(8) Remove the Bailey beam, and move the box girder at the Bailey beam position on the box girder adjacent to the Bailey beam to the supporting pad stone at the Bailey beam place for installation.

The beneficial effect of the present invention is: because the prefabricated erection of the box girder is carried out on the span of the bridge using Bailey beams, the method is not affected by the geographical environment, so it is suitable for areas with large terrain height difference and complex terrain; The beam time saves the installation of large equipment such as gantry cranes and bridge erecting machines, thus improving labor production efficiency, saving costs, and saving construction periods.

Description of drawings

Fig. 1 is a kind of Bailey beam that utilizes Bailey beam to carry out box girder prefabricated erection construction method of the present invention the Bailey beam installation top view diagram;

Fig. 2 is a kind of Bailey beam pedestal installation top view schematic diagram that utilizes Bailey beam to carry out box girder prefabricated erection construction method of the present invention;

Fig. 3 is a kind of box girder bottom template installation top view schematic diagram that utilizes Bailey beam to carry out box girder prefabricated erection construction method of the present invention;

Fig. 4 is a kind of elevation schematic diagram that utilizes Bailey beam to carry out box girder prefabricated erection construction method of the present invention;

Fig. 5 is a top view schematic diagram of box girder moving beam installation of a construction method of prefabricated box girder erection using Bailey beams according to the present invention.

Detailed ways

The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

A kind of utilization Bailey beam of the present invention as shown in the accompanying drawing carries out box girder prefabricated erection construction method, and it comprises the following steps: (1) set up abutment abutment on the side span abutment of the first span 1 that has been constructed Cap 4 and set up the second pier cover girder 5-2 and the first pier cover girder 5-1 respectively on the two side piers of the second span 2 that has been constructed; (2) on the abutment cap 4, At least two support pad stones 6-2, 7-2, 8-2 are respectively arranged at intervals on the first and second pier cap beams 5-1, 5-2, and then on the abutment cap 4, the first and the second A Bailey beam 3 is erected vertically on a support pad stone of the two pier cover beams 5-1, 5-2; (3) a pedestal is installed on the Bailey beam 3; (4) on the said Bailey beam 3 Carry out the preparation of the first box girder of the first span and the second span on the pedestal; (5) traverse the prepared first span and the first box girder of the second span from the pedestal of the Bailey beam to the first Install the first piece of box girder on span 1 and second span 2, where the two ends of the first piece of box girder in the first span are erected on the corresponding supports of the abutment cap and the first pier cap girder. On the cushion stone, the two ends of the first box girder of the second span are erected on the support cushion stone correspondingly provided with the first pier cap beam and the second pier cap beam; (6) repeating the steps (4) and (5), until all the box girders at the 3rd position of the Bailey beam are installed; (8) remove the Bailey beam 3, and move the box beam at the Bailey beam position on the box beam adjacent to the Bailey beam to the supporting pad stone at the Bailey beam place for installation. The preparation of the box girder can be done by conventional existing methods. This method can be found in "Technical Specifications for Construction of Highway Bridges and Culverts 2011".

The installation of the pedestal in the preferred described step (3) includes the following steps: (a) laying a plurality of channel steels 9 at intervals on the described Bailey beam; A plurality of I-beams 11 are laid on the top along the longitudinal full length. The advantage is to ensure the installation of the box girder formwork and the flatness of the bottom of the box girder, so that the pedestal has sufficient bearing capacity and is structurally safe.

Further preferably, between the above steps (a) and (b), there is a step of performing full-load preloading on the channel steel with sand bags. The advantages are: to ensure the foundation of the pedestal is stable, to ensure that the external dimensions of the box girder do not change during prefabrication; to avoid sinking and bending of the pedestal during the construction process; to ensure that the reverse arch value set by the bottom formwork of the box girder remains unchanged.

Further preferably, in the step (2), when there are four support pad stones, the Bailey beam 3 is erected on the abutment cap, first and second abutment caps along the longitudinal length. Place the box girder at the position of the Bailey beam in the middle of the third and fourth box girders adjacent to the Bailey beam in the step (7) . The advantage is that it is safe to bear and bear force, and it is convenient for on-site construction and operation.

Example 1

(1) Erect the abutment abutment cap 4 on the side span abutment of the first span 1 that has been constructed, and erect the second pier cap beam 5-2 and The first pier cover beam 5-1; (2) on the described abutment abutment cap 4, the first and second pier cover beams 5-1, 5-2, four support pad stones are set at intervals respectively, and then On the second support pad stone of the abutment platform cap 4, the first and second pier cap beams 5-1, 5-2, a Bailey beam 3 is erected along the longitudinal length; (3) on the Bailey beam 3, install the pedestal; the step of pedestal installation is: on the described Bailey beam 3, horizontally lay a plurality of channel steels 9 at intervals; Word steel 11; (4) the first span 1 and the second span 2 each span include four box girders 12-1, 12-2, 12-3, 12-4, 13-1, 13-2, 13-3, 13-4, carry out the preparation of the first span and the second span first piece of box girder 12-4, 13-4 on the said pedestal; (5) prepare the first piece of the first span and the box girder of the second span are installed on the position of placing the first box girder 12-4, 13-4 of the first span and the second span from the pedestal of the Bailey beam; wherein the first span of the first span The two ends of a piece of box girder are erected on the supporting pad stones corresponding to the abutment cap and the cover beam of the first pier, and the two ends of the first box girder of the second span are erected on the cover girder of the first pier and the second pier (6) Repeat steps (4) and (5) until all box girders except Bailey beam 3 are installed; (7) Prepare the Bailey beam position and place the box girder at the Bailey beam position on the third box girder 12-3 and the fourth box girder 12-4 of the first span adjacent to the Bailey beam and the third box girder 13- of the second span 3 and the middle position of the fourth box girder 13-4; (8) remove the Bailey beam 3, and move the box girder 12-2, 13-2 at the Bailey beam position to the bearing at the Bailey beam place Installed on the plinth.

The advantage is: when the number of box girders is small, the terrain at the approach bridge has large height fluctuations, and the terrain is complex, the patented method can be used for construction, so that the prefabricated erection of the box girder can be carried out on the bridge span by using the Bailey beam. The beam can be erected and dismantled at any time, which is very convenient and not affected by the geographical environment. The installation of large-scale equipment such as gantry cranes and bridge erecting machines is omitted, thereby improving labor production efficiency, saving costs and construction periods, and is economical and reasonable.

Claims (4)

1. one kind is utilized Bei Leiliang to carry out the beam prefabricated erection construction method of case, it is characterized in that it may further comprise the steps:

(1) the first end bay abutment of striding of having constructed set up abutment platform cap and the second both sides bridge pier of striding of constructing on set up the second bridge pier bent cap and the first bridge pier bent cap respectively;

(2) at described abutment platform cap, the first and second bridge pier bent caps at least two bearing pad stones are set at interval respectively, then elongated one Bei Leiliang longitudinally on a bearing pad stone of abutment platform cap, the first and second bridge pier bent caps;

(3) installed base on described Bei Leiliang;

(4) carry out the preparation of first first case beam of striding and second first case beam of striding at described pedestal;

(5) first first case beam of striding of preparation being finished and second first case beam of striding are stepped up the position of placing first case beam and are installed from traversing striding with second to first on the pedestal of Bei Leiliang, wherein the two ends of first first case beam of striding are erected on the bearing pad stone of abutment platform cap and the corresponding setting of the first bridge pier bent cap, and the two ends of second first case beam of striding are erected on the bearing pad stone of the first bridge pier bent cap and the corresponding setting of the second bridge pier bent cap;

(6) repeat described step (4) and (5), until installing except all case beams of shellfish Lei Liang position;

(7) the case beam of preparation shellfish Lei Liang position and the case beam of shellfish Lei Liang position is placed on the case beam with shellfish Lei Liang adjacent position;

(8) remove described Bei Leiliang, will with the case beam of shellfish Lei Liang adjacent position on the case beam of shellfish Lei Liang position move on the bearing pad stone at Bei Leiliang place and install.

2. the Bei Leiliang of utilization according to claim 1 carries out the beam prefabricated erection construction method of case, it is characterized in that: the installation of the pedestal in the described step (3) may further comprise the steps: (a) the polylith channel-section steel is laid in the lateral separation on described Bei Leiliang; (b) many i iron of elongated laying longitudinally at the top of described polylith channel-section steel.

3. the Bei Leiliang of utilization according to claim 2 carries out the beam prefabricated erection construction method of case, it is characterized in that: be included in described step (a) with (b) and carry out fullcharging with sand pocket on the channel-section steel and carry the precompressed step.

4. the Bei Leiliang of utilization according to claim 2 carries out the beam prefabricated erection construction method of case, it is characterized in that: in described step (2), when described bearing pad stone is four, with described Bei Leiliang longitudinally on elongated second bearing pad stone that is erected at abutment platform cap, the first and second bridge pier bent caps, and in described step (7), the case beam of shellfish Lei Liang position is placed on the centre position with third and fourth case beam of shellfish Lei Liang adjacent position.

Images