CN110295620B - Rapid and accurate positioning method for integral skid-mounted cold box of large air separation device - Google Patents
Rapid and accurate positioning method for integral skid-mounted cold box of large air separation device Download PDFInfo
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- E—FIXED CONSTRUCTIONS
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Abstract
The invention relates to the field of installation of large-scale equipment, in particular to a quick and accurate positioning method for an integral skid-mounted cold box of a large-scale air separation device; the method is characterized by comprising the following steps: positioning and paying off according to a plan view of a cold box foundation bearing platform, and marking the position of a foundation bolt; fixing the foundation bolts according to groups by using a reinforced bracket; pouring and maintaining a cold box foundation; manufacturing each component of the positioning measurement mould according to drawing processing; placing a steel framework of the positioning measurement mould in place, placing a steel template into a foundation bolt, leveling and welding; lifting out the whole positioning and measuring die, removing the connecting bolt, and transporting the die back to a cold box assembly workshop; manufacturing the whole cold box bottom plate according to the position of the screw hole on the clamp groove re-assembly mould; and (4) entering a screw hole of a bottom plate of the cold box, rechecking and positioning for adjustment. The method strengthens the corresponding relation between the foundation bolts of the cold box foundation and the bolt holes of the bottom plate of the cold box, and reduces the strict requirements on the installation precision of the foundation bolts in the construction process of the cold box foundation.
Description
Technical Field
The invention relates to the field of installation of large-scale equipment, in particular to a quick and accurate positioning method for an integral skid-mounted cold box of a large-scale air separation device.
Background
In recent years, the demand of the petrochemical industry for air separation is increased, and the gradual improvement and perfection of the air separation oxygen generation technology are promoted. The large-scale integral skid-mounted cold box gradually becomes the mainstream of a large-scale air separation device by virtue of incomparable huge advantages in construction quality, safety and progress, and also provides new challenges for the reformation of a construction process. The foundation bolts used for fixing the large-scale air separation whole cold box are large in specification and size and large in quantity, the requirement on the whole accuracy between the foundation bolts is high, and the whole cold box cannot be in place due to the deviation of any foundation bolt. And the uncontrollable deviation of foundation bolts or bolt holes can be caused by pouring and vibrating of the cold box foundation, curing and shrinking of concrete and the different-place processing of the cold box bottom plate.
In the existing traditional construction technology, design drawings are generally taken as the basis, on one hand, in the cold box foundation construction, the installation accuracy and the stability of the embedded foundation bolts are emphasized, and the installation deviation in the bolt positioning, concrete vibrating and curing shrinkage processes is reduced as much as possible. On the other hand, when the assembly workshop is required to manufacture and install the cold box bottom plate, the high accuracy of the position of the bottom plate bolt hole and the position required by design is achieved. The deformation generated in the welding and installation process is controlled as much as possible. However, the foundation bolts in the construction process of the cold box foundation or the welding deformation in the assembly process of the cold box bottom plate have strong uncontrollable performance, and once the deformation is accumulated, the whole cold box cannot be in place. If the requirements for controlling both deformation amounts are continuously increased, geometric cost is increased. And for the deviation requirement between the two and the design drawing, whether whole cold box can take one's place fast accurately, more aspects lie in the accurate corresponding relation between cold box bottom plate bolt hole and the basic pre-buried rag bolt group of cold box.
Disclosure of Invention
The invention aims to overcome the defects and provide a method for rapidly and accurately positioning the whole cold box by ensuring that the cold box is positioned and the bolt holes of the bottom plate are smoothly placed into the foundation bolts.
In order to achieve the above object, the present invention is realized by:
a method for quickly and accurately positioning an integral skid-mounted cold box of a large air separation device comprises the following steps:
step 1, positioning and paying off according to a plan view of a cold box foundation bearing platform, and marking the position of a foundation bolt;
step 2, fixing the foundation bolts according to groups by adopting a reinforced bracket to prevent vibration deformation;
step 3, pouring and maintaining the cold box foundation;
step 4, manufacturing each component of the positioning measurement mould according to drawing processing;
step 5, placing the steel framework of the positioning measurement mould in place, placing the steel template into the foundation bolt, leveling and welding;
step 6, lifting out the whole positioning measurement die, dismantling the connecting bolt, and transporting the positioning measurement die back to a cold box assembly workshop;
step 7, checking hole positions of the bottom plates of the cold box column legs according to the reassembled positioning measurement mould;
step 8, entering a cold box bottom plate and rechecking;
step 9, adjusting the whole cold box in position;
wherein the content of the first and second substances,
the cold box foundation anchor bolt position marking in the step 1 is that on a cold box foundation cushion layer, a total station or other reference measuring tools are adopted to position and pay off each anchor bolt position on the cushion layer according to a cold box foundation bearing platform plane arrangement diagram, and the error between the actually measured diagonal length between every two anchor bolts and the design requirement is required to be not more than 2 mm;
step 2, fixedly supporting the cold box pre-buried foundation bolts, namely dividing each group of foundation bolts into an upper layer and a lower layer for fixing and reinforcing after the foundation bolts are positioned and straightened by adopting angle steel, and controlling the relative positions of the inner bolts of each group by a hole-fixing steel plate, wherein the deviation of the relative positions of the bolts of each group is required to be not more than 7 mm;
pouring and maintaining the cold box foundation in the step 3, namely controlling concrete vibration and foundation maintenance shrinkage deformation during cold box foundation construction, and dismantling the foundation bolt fixing steel plate after the cold box foundation meets the requirement of maintenance conditions;
in the step 4, the cold box foundation embedded bolt positioning and measuring die is convenient to transport, the steel skeleton beam can be combined and spliced by three parts, steel seal numbers are marked on the steel skeleton beam for distinguishing, the die steel skeleton beam is used for measuring and recording the relative positions of all groups of foundation bolts of the cold box foundation, and the die template is used for measuring and recording the relative positions of all groups of foundation bolts;
step 5, firstly, placing the die steel frame beam in place according to the requirements of the drawing, and then placing the die template into the foundation bolt; lifting the die template from the bottom by using a steel frame beam, adjusting the surface of the die template to be at the same horizontal elevation, welding and fixing the template on the steel frame beam, naturally cooling a welding line, and rechecking and adjusting all the templates to be at the same horizontal elevation;
step 6, hoisting the whole positioning die out of the position of the foundation bolt, placing the positioning die on a flat ground, checking the serial number of each component of the die, retesting the hole pitch data of the diagonal bolts of the part, drawing a sketch for recording, and rechecking the bolt holes of the bottom plate after the cold box enters the field; removing the connecting bolts of the mold, and returning the template to a cold box assembly workshop;
step 7, connecting the plate clamping groove positions according to the steel frame beam assembly in a workshop, connecting the splicing die through bolts, and manufacturing a cold box bottom plate according to the die bolt hole positions;
in step 8, after the cold box enters the field, rechecking the distance between the bolt holes of the bottom plate of the cold box, and further ensuring the accuracy of the bolt holes of the bottom plate of the cold box and foundation bolts of the cold box;
and 9, hoisting the cold box in place, determining the installation direction of the cold box according to a drawing of the cold box, arranging a specially-assigned person to nurse each group of bolts, adjusting the positions of the screw holes of the cold box by means of scaffold steel pipes and a batten tool, keeping the cold box stable, and slowly placing the cold box in place when all the bolts correspond to the screw holes.
According to the method, the accuracy and stability of the embedded foundation bolts during the construction of the cold box foundation are ensured through the angle steel fixing support frame, and the vibration deformation and the shrinkage deformation in the concrete pouring and curing process are effectively prevented. Meanwhile, the relative position of the foundation anchor bolt of the cold box can be accurately reflected to a cold box assembly workshop by using the positioning and measuring die of the foundation anchor bolt of the integral cold box, so that the accurate positioning of the bolt hole of the bottom plate of the cold box is ensured, and the accuracy of one-time positioning of the cold box is further ensured by retesting the bolt hole of the bottom plate after the cold box enters the field; the skid-mounted cold box is safely, efficiently and smoothly hoisted in place, the possible bottom plate reaming risk in the hoisting process is greatly reduced, and the safety and the rapidness of accurate placing of the cold box are ensured.
Drawings
FIG. 1 is a schematic view of the construction method.
Detailed Description
The invention is further illustrated by the following specific examples.
As shown in fig. 1, a method for quickly and accurately positioning an integral skid-mounted cold box of a large air separation plant comprises the following steps:
step 1, positioning and paying off according to a plan view of a cold box foundation bearing platform, and marking the position of a foundation bolt;
step 2, fixing the foundation bolts according to groups by adopting a reinforced bracket to prevent vibration deformation;
step 3, pouring and maintaining the cold box foundation;
step 4, manufacturing each component of the positioning measurement mould according to drawing processing;
step 5, placing the steel framework of the positioning measurement mould in place, placing the steel template into the foundation bolt, leveling and welding;
step 6, lifting out the whole positioning measurement die, dismantling the connecting bolt, and transporting the positioning measurement die back to a cold box assembly workshop;
step 7, checking hole positions of the bottom plates of the cold box column legs according to the reassembled positioning measurement mould;
step 8, entering a cold box bottom plate and rechecking;
step 9, adjusting the whole cold box in position;
wherein the content of the first and second substances,
the cold box foundation anchor bolt position marking in the step 1 is that on a cold box foundation cushion layer, a total station or other reference measuring tools are adopted to position and pay off each anchor bolt position on the cushion layer according to a cold box foundation bearing platform plane arrangement diagram, and the error between the actually measured diagonal length between every two anchor bolts and the design requirement is required to be not more than 2 mm;
step 2, fixedly supporting the cold box pre-buried foundation bolts, namely dividing each group of foundation bolts into an upper layer and a lower layer for fixing and reinforcing after the foundation bolts are positioned and straightened by adopting angle steel, and controlling the relative positions of the inner bolts of each group by a hole-fixing steel plate, wherein the deviation of the relative positions of the bolts of each group is required to be not more than 7 mm;
pouring and maintaining the cold box foundation in the step 3, namely controlling concrete vibration and foundation maintenance shrinkage deformation during cold box foundation construction, and dismantling the foundation bolt fixing steel plate after the cold box foundation meets the requirement of maintenance conditions;
in the step 4, the cold box foundation embedded bolt positioning and measuring die is convenient to transport, the steel skeleton beam can be combined and spliced by three parts, steel seal numbers are marked on the steel skeleton beam for distinguishing, the die steel skeleton beam is used for measuring and recording the relative positions of all groups of foundation bolts of the cold box foundation, and the die template is used for measuring and recording the relative positions of all groups of foundation bolts;
step 5, firstly, placing the die steel frame beam in place according to the requirements of the drawing, and then placing the die template into the foundation bolt; lifting the die template from the bottom by using a steel frame beam, adjusting the surface of the die template to be at the same horizontal elevation, welding and fixing the template on the steel frame beam, naturally cooling a welding line, and rechecking and adjusting all the templates to be at the same horizontal elevation;
step 6, hoisting the whole positioning die out of the position of the foundation bolt, placing the positioning die on a flat ground, checking the serial number of each component of the die and the diagonal point distance data of the retesting part, drawing a diagram for recording, and rechecking the bolt hole of the bottom plate after the cold box enters the field; removing the connecting bolts of the mold, and returning the template to a cold box assembly workshop;
step 7, connecting the plate clamping groove positions according to the steel frame beam assembly in a workshop, connecting the splicing die through bolts, and manufacturing a cold box bottom plate according to the die bolt hole positions;
in step 8, after the cold box enters the field, rechecking the distance between the bolt holes of the bottom plate of the cold box, and further ensuring the accuracy of the bolt holes of the bottom plate of the cold box and foundation bolts of the cold box;
and 9, hoisting the cold box in place, determining the installation direction of the cold box according to a drawing of the cold box, arranging a specially-assigned person to nurse each group of bolts, adjusting the positions of the screw holes of the cold box by means of scaffold steel pipes and a batten tool, keeping the cold box stable, and slowly placing the cold box in place when all the bolts correspond to the screw holes.
According to the method, the accuracy and stability of the embedded foundation bolts during the construction of the cold box foundation are ensured through the angle steel fixing support frame, and the vibration deformation and the shrinkage deformation in the concrete pouring and curing process are effectively prevented. Meanwhile, the relative position of the foundation anchor bolt of the cold box can be accurately reflected to a cold box assembly workshop by using the positioning and measuring die of the foundation anchor bolt of the integral cold box, so that the accurate positioning of the bolt hole of the bottom plate of the cold box is ensured, and the accuracy of one-time positioning of the cold box is further ensured by retesting the bolt hole of the bottom plate after the cold box enters the field; the skid-mounted cold box is safely, efficiently and smoothly hoisted in place, the possible bottom plate reaming risk in the hoisting process is greatly reduced, and the safety and the rapidness of accurate placing of the cold box are ensured.
Claims (1)
1. A quick and accurate positioning method for an integral skid-mounted cold box of a large air separation device is characterized by comprising the following steps:
step 1, positioning and paying off according to a plan view of a cold box foundation bearing platform, and marking the position of a foundation bolt;
step 2, fixing the foundation bolts according to groups by adopting a reinforced bracket to prevent vibration deformation;
step 3, pouring and maintaining the cold box foundation;
step 4, manufacturing each component of the positioning measurement mould according to drawing processing;
step 5, placing the steel framework of the positioning measurement mould in place, placing the steel template into the foundation bolt, leveling and welding;
step 6, lifting out the whole positioning measurement die, dismantling the connecting bolt, and transporting the positioning measurement die back to a cold box assembly workshop;
step 7, checking hole positions of the bottom plates of the cold box column legs according to the reassembled positioning measurement mould;
step 8, entering a cold box bottom plate and rechecking;
step 9, adjusting the whole cold box in position;
wherein the content of the first and second substances,
the cold box foundation anchor bolt position marking in the step 1 is that on a cold box foundation cushion layer, a total station or other reference measuring tools are adopted to position and pay off each anchor bolt position on the cushion layer according to a cold box foundation bearing platform plane arrangement diagram, and the error between the actually measured diagonal length between every two anchor bolts and the design requirement is required to be not more than 2 mm;
step 2, fixedly supporting the cold box pre-buried foundation bolts, namely dividing each group of foundation bolts into an upper layer and a lower layer for fixing and reinforcing after the foundation bolts are positioned and straightened by adopting angle steel, and controlling the relative positions of the inner bolts of each group by a hole-fixing steel plate, wherein the deviation of the relative positions of the bolts of each group is required to be not more than 7 mm;
pouring and maintaining the cold box foundation in the step 3, namely controlling concrete vibration and foundation maintenance shrinkage deformation during cold box foundation construction, and dismantling the foundation bolt fixing steel plate after the cold box foundation meets the requirement of maintenance conditions;
in the step 4, the cold box foundation embedded bolt positioning and measuring die is convenient to transport, the steel skeleton beam can be combined and spliced by three parts, steel seal numbers are marked on the steel skeleton beam for distinguishing, the die steel skeleton beam is used for measuring and recording the relative positions of all groups of foundation bolts of the cold box foundation, and the die template is used for measuring and recording the relative positions of all groups of foundation bolts;
step 5, firstly, placing the die steel frame beam in place according to the requirements of the drawing, and then placing the die template into the foundation bolt; lifting the die template from the bottom by using a steel frame beam, adjusting the surface of the die template to be at the same horizontal elevation, welding and fixing the template on the steel frame beam, naturally cooling a welding line, and rechecking and adjusting all the templates to be at the same horizontal elevation;
step 6, hoisting the whole positioning die out of the position of the foundation bolt, placing the positioning die on a flat ground, checking the serial number of each component of the die, measuring the distance data of diagonal bolts of the die part, drawing a sketch record, and rechecking the bolt holes of the bottom plate after the cold box enters the field; removing the connecting bolts of the mold, and returning the template to a cold box assembly workshop;
step 7, connecting the plate clamping groove positions according to the steel frame beam assembly in a workshop, connecting the splicing die through bolts, and manufacturing a cold box bottom plate according to the die bolt hole positions;
in step 8, after the cold box enters the field, rechecking the distance between the bolt holes of the bottom plate of the cold box, and further ensuring the accuracy of the bolt holes of the bottom plate of the cold box and foundation bolts of the cold box;
and 9, hoisting the cold box in place, determining the installation direction of the cold box according to a drawing of the cold box, arranging a specially-assigned person to nurse each group of bolts, adjusting the positions of the screw holes of the cold box by means of scaffold steel pipes and a batten tool, keeping the cold box stable, and slowly placing the cold box in place when all the bolts correspond to the screw holes.
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| CN111963411B (en) * | 2020-07-22 | 2022-08-05 | 上海二十冶建设有限公司 | Quick mounting method for skid-mounted air compressor unit of large air separation device |
| CN112431217A (en) * | 2020-12-03 | 2021-03-02 | 上海二十冶建设有限公司 | Construction method of large skid-mounted cold box pile-free anti-seismic raft foundation |
| CN113958801B (en) * | 2021-10-09 | 2023-02-17 | 中国化学工程第六建设有限公司 | Column base bottom plate separated large-scale integral cold box and installation method thereof |
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| FR2927097A1 (en) * | 2008-05-23 | 2009-08-07 | Air Liquide | Cylindrical load-bearing pile for supporting circular reservoir of air separation and liquefaction plant, has pile head including anchoring element that anchors element i.e. circular reservoir, of separation and liquefaction plant to head |
| CN104785904B (en) * | 2015-04-01 | 2017-03-22 | 中石化工建设有限公司 | Technology for installing pre-buried bolts to large-scale air separation device cold box |
| CN105298139A (en) * | 2015-09-22 | 2016-02-03 | 上海十三冶建设有限公司 | Modular mounting method of large space division cooling box steel structure |
| CN109340510A (en) * | 2018-10-18 | 2019-02-15 | 杭州杭氧化医工程有限公司 | Air separation cooling box basis foot anchor mounting structure and its installation method |
| CN109720976B (en) * | 2018-12-28 | 2020-07-28 | 上海二十冶建设有限公司 | Mounting method of integral skid-mounted cold box in large-scale air separation project |
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