Method for adjusting and fixing an air separation cold box

Abstract

The application discloses a method for adjusting and fixing an air separation cold box, utilizes movable adjustable foundation bolts, reserves sufficient adjustable intervals, and through methods such as adjustment, fixing block welding, bolt fastening and foundation grouting, can quickly and effectively fix the cold box installed on site, can realize smooth installation of the cold box under the condition that the foundation bolt holes are not processed, and ensures safe and stable operation of the air separation cold box equipment.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of air separation oxygen equipment installation, in particular to a method for adjusting and fixing an air separation cold box. BACKGROUND

[0002] With the rapid iteration of domestic air separation device installation technology, the installation method of the cold box as the core equipment of oxygen production is also rapidly iterating and updating. The air separation cold box is composed of steel structure, tower, pipeline, instrument, etc., with a height of more than 60 meters. With the continuous progress of technology, the cold box supply presents diversified forms, such as integral skid-mounted type, split skid-mounted type, bulk type, and on-site horizontal assembly vertical installation, etc. The space in the cold box is narrow, high-altitude operation is frequent, and the safety risk is high. The modular construction technology of large air separation device of multiple specialties avoids the problems of inconvenient transportation of large pieces after cold box factory production and high safety risk of high-altitude operation, inconvenient installation quality inspection, and difficult quality control of on-site assembled cold box construction. It has broad development prospects for the target market with inconvenient transportation conditions and strict quality requirements.

[0003] The research on the installation, adjustment and fixing method of the air separation cold box can ensure the smooth progress of the installation work to the greatest extent for the cold box produced on site, and can also achieve the rapid and accurate fixing of the whole cold box installation on the construction site where the processing equipment is not very complete. The conventional cold box installation basically adopts the method of pre-buried fixed anchor bolts, but there is always a size and positioning deviation between the pre-buried anchor bolt and the bolt hole processed by the cold box equipment, and there is a problem of installation inconsistency. SUMMARY

[0004] The present application provides a method for adjusting and fixing an air separation cold box, which can solve the problem of deviation between the pre-buried anchor bolt and the bolt hole processed by the cold box equipment during the installation process of the existing air separation cold box, and the installation is not accurate.

[0005] To achieve the above-mentioned purpose, the present application provides the following technical scheme: a method for adjusting and fixing an air separation cold box, comprising the following steps:

[0006] S1, pre-buried adjustable anchor bolt box and anchor bolt installation: while the cold box is produced on site, the cold box foundation is constructed, the cold box foundation bottom plate anchor bolt box is set, the anchor bolt bottom anchoring end of the cold box is movable in the anchor bolt box, and the upper part of the anchor bolt protrudes out of the foundation surface;

[0007] S2, cold box foundation pouring and curing: after the anchor bolt box is fixed in the foundation, the cold box foundation is poured, thereby forming the state that the bottom part of the anchor bolt is securely sleeved in the cold box foundation and movable within a certain range, and the upper part of the anchor bolt is provided with a weldable fixing block penetrating the anchor bolt screw rod, which is used for welding and fixing with the bottom structure of the cold box;

[0008] S3, foundation gouging, grouting baffle installation: before lifting the cold box, the steel structure part of the bottom of the cold box is extended outwardly to set a grouting baffle with a steel belt, and the gap between the baffle and the concrete foundation is filled with resin;

[0009] S4, pad iron leveling, adjustable welding fixed block leveling: a circle of pad irons are arranged at the lower part of the steel structure part of the bottom of the cold box, and the lower part of the anchor bolt welding fixed block is arranged at the same height as the cold box with pad irons, the pad irons are leveled by advance measurement, and the longitudinal and transverse positioning lines are popped out in advance when the cold box is positioned;

[0010] S5, cold box lifting and adjustment: a pipe shaft type lifting lug is arranged at each of the four corners of the top of the cold box, and the cold box is lifted and adjusted by using a lifting appliance;

[0011] S6, intermittent spot welding of anchor bolt fixed block: the fixed block connected by the anchor bolt is tightly attached to the side wall profile steel of the four corners of the cold box, and intermittent spot welding is performed;

[0012] S7, initial tightening of the anchor bolt of the cold box: after confirming the spot welding, the anchor bolt is tightened, so that the fixed block bears the downward tightening force;

[0013] S8, full welding of the anchor bolt fixed block: synchronous and symmetrical welding is performed on the contact part of the fixed block and the side wall profile steel of the cold box at the four corners of the cold box, and the height of the welding seam is checked to meet the design and specification requirements;

[0014] S9, final tightening of the anchor bolt nut of the cold box: after full welding, the orientation and perpendicularity of the cold box are checked again, and the anchor bolt of the cold box is finally tightened after confirming that the adjustment is qualified, so that the cold box is completely fastened with the anchor bolt, the anchor bolt box and the cold box foundation;

[0015] S10, grouting of the cold box foundation: after the outside formwork is erected, the foundation is immediately grouted once with non-shrinkage and micro-expansion resin grouting material to completely fill the anchor bolt box and the bottom of the cold box profile steel.

[0016] As a preferred, the cold box is made on site with a structure that the bottom four sides are steel structure profile steels and the middle part is suspended.

[0017] As a preferred, the grouting baffle is a steel belt that is extended outwardly by 100mm.

[0018] As a preferred, the anchor bolt box is an iron box formed by welding a square steel plate at the bottom, and the upper part of the anchor bolt box is a steel pipe.

[0019] As a preferred, the lifting of the cold box in S5 uses a combined type balance lifting appliance with slidable steel wire ropes and a width adjustable support balance beam, and the cold box is lifted and positioned by using double machines.

[0020] Compared with the prior art, the present application has the following advantages:

[0021] Compared to conventional cold box equipment that uses pre-drilled bolt holes in the foundation for fixing, adjustable anchor bolts offer greater adjustability and eliminate the problem of bolts not fitting properly due to variations in bolt hole dimensions. The grouting method is more economical than the traditional full-side grouting approach, reducing the grout flow area and ensuring a denser grouting of the bottom steel sections, resulting in better foundation load-bearing capacity. It has a wide range of applications, applicable to all large equipment requiring high precision and where adjustments are difficult after errors occur. Breaking away from conventional bolt hole fixing methods, adjustable anchor bolts effectively secure equipment, especially large continuous equipment, offering valuable insights. Attached Figure Description

[0022] Figure 1 This is a diagram illustrating the method steps of the present invention. Detailed Implementation

[0023] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention.

[0024] like Figure 1 As shown, in order to solve the problem of inaccurate installation caused by the misalignment between the pre-embedded anchor bolts and the bolt holes machined in the cold box equipment during the existing air separation cold box installation process, this embodiment provides a method for adjusting and fixing the air separation cold box, including the following steps:

[0025] While the cold box is being fabricated on-site, its foundation is also being constructed. Anchor bolt boxes are installed on the foundation base plate. The bottom of the bolt box is a square steel plate welded into an iron box, with a steel pipe on top. The anchor ends of the anchor bolts are movable within the bolt box, with the upper parts of the bolts extending beyond the foundation surface. After the anchor bolt boxes are fixed with reinforcing bars within the foundation, the cold box foundation is poured, thus creating a state where the bolts are securely fitted within the foundation and can move within a certain range. Weldable fixing blocks are installed on the upper part of the anchor bolts, passing through the bolt threads, and are used to weld and fix them to the bottom structure of the cold box. The cold box is fabricated on-site with a steel structure around the bottom perimeter and a 400mm overhang in the middle.

[0026] Before hoisting the cold box, extend the bottom steel structure of the cold box outward by 100mm and install a grouting baffle with steel strips. Fill the gap between the baffle and the concrete foundation with resin. Place a ring of shims at 300mm intervals under the bottom steel structure of the cold box. Place shims at the bottom of the anchor bolt welding fixing blocks, flush with the cold box. The shims are measured and leveled in advance, and the longitudinal and transverse positioning lines of the cold box are marked in advance.

[0027] A pipe shaft lifting lug is arranged at each of the four corners of the top of the cold box, a slidable combined balance lifting tool and a width-adjustable support balance beam are used, and the cold box is hoisted into position by double machines, so that the relative balance of the cold box during overall hoisting into position can be ensured; the cold box is placed on the leveled pad iron group by using a crowbar, a jack and other auxiliary tools, orientation and perpendicularity detection is performed, after adjustment is completed, the fixed block connected by the foundation bolt is tightly attached to the side wall profile steel of the four corners of the cold box, intermittent spot welding is performed, after spot welding is confirmed to be completed, the foundation bolt is tightened, so that the fixed block bears the downward fastening force; four welders are arranged at the four corners of the cold box to synchronously and symmetrically weld the contact part of the fixed block and the side wall profile steel of the cold box, and the height of the weld is checked to meet the design and specification requirements; after full welding is completed, the orientation and perpendicularity of the cold box are checked again, and after it is confirmed that the adjustment is qualified, the foundation bolt of the cold box is finally tightened, so that the cold box is completely fastened by the foundation bolt, the foundation bolt box and the cold box foundation. After the outside formwork is set, the foundation is immediately grouted once by using non-shrinkage and slightly-expanding resin grouting material, and the foundation bolt box and the bottom of the cold box profile steel are completely grouted. The adjustment and fixing of the cold box installation are completed.

[0028] Therefore, in the embodiment, the movable adjustable foundation bolt is used to reserve a sufficient adjustable interval, and the cold box installed on site is quickly and effectively fixed by adjusting, fixed block welding, bolt fastening and foundation grouting before and after the cold box is hoisted into position, so that the cold box manufactured on site can be smoothly installed without processing the foundation bolt hole, and the safe and stable operation of the air separation device cold box equipment is ensured.

[0029] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the present application are only used to explain the relative positional relationship, movement condition, etc. between components in a certain specific posture (as shown in the drawings), and if the specific posture changes, the directional indications also change accordingly.

[0030] In addition, the description such as "first", "second" and the like in the present application is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the indicated technical features or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first", "second" can be explicitly or implicitly included at least one of the features. In the description of the present application, the meaning of "a plurality of" is at least two, for example, two, three, etc., unless otherwise specifically limited.

[0031] In the present application, unless otherwise explicitly specified and limited, the terms "connection", "fixation" and the like should be understood in a broad sense, for example, "fixation" can be fixed connection, or detachable connection, or integral; can be mechanical connection, or electrical connection; can be directly connected, or indirectly connected through intermediate medium, can be internal communication of two elements or interaction relationship of two elements, unless otherwise explicitly limited. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0032] In addition, the technical solutions among various embodiments of the present application can be combined with each other, but it must be based on the fact that a person skilled in the art can realize it, when the combination of technical solutions appears contradictory or unachievable, it should be considered that the combination of technical solutions does not exist, nor is it within the protection scope required by the present application.

Claims

1. A method of adjusting the fixation of an air separation cold box, characterized in that, It comprises the following steps: S1, embedded adjustable anchor bolt box and anchor bolt installation: while the cold box is made on site, the cold box foundation is constructed, the anchor bolt box of the cold box foundation bottom plate is set, the anchor bolt bottom anchoring end is movable in the anchor bolt box, and the anchor bolt upper part extends out of the foundation surface; S2, cold box foundation pouring and curing: after the anchor bolt box is fixed in the foundation, the cold box foundation is poured, thus forming the state that the anchor bolt bottom is securely sleeved in the cold box foundation and movable within a certain range, and the anchor bolt upper part is provided with a weldable fixing block penetrating the anchor bolt screw rod, which is used for welding and fixing with the cold box bottom structure; S3, foundation chiseling, grouting baffle installation: before the cold box is hoisted, the steel belt grouting baffle is set at the outwardly extended part of the cold box bottom steel structure part, and the gap between the baffle and the concrete foundation is filled with resin; S4, pad iron leveling, adjustable welding fixing block leveling: a circle of pad irons is set at the lower part of the cold box bottom steel structure part, the lower part of the anchor bolt welding fixing block is leveled with the pad irons, the pad irons are leveled by advance measurement, and the longitudinal and transverse positioning lines are popped out in advance; S5, cold box hoisting and adjustment: one pipe shaft type lifting lug is arranged at each of the four corners of the cold box top, and the cold box is hoisted and adjusted by using a lifting appliance; S6, intermittent point welding of the anchor bolt fixing block: the fixing block connected with the anchor bolt is tightly attached to the side wall profile steel of the cold box four corners, and intermittent point welding is performed; S7, initial tightening of the cold box anchor bolt: after the point welding is completed, the anchor bolt is tightened, so that the fixing block bears the downward fastening force; S8, full welding of the anchor bolt fixing block: after the full welding is completed, the orientation and perpendicularity of the cold box are checked again, and after the adjustment is confirmed to be qualified, the cold box anchor bolt is finally tightened, so that the cold box is completely fastened with the anchor bolt, the anchor bolt box and the cold box foundation; S10, cold box foundation grouting: after the outside formwork is set, the foundation is immediately grouted with non-shrinkage and micro-expansion resin grouting material, so that the anchor bolt box and the cold box profile steel bottom are completely grouted. The cold box is made on site with a structure that the bottom four sides are steel structure profile steels and the middle part is suspended.

2. The method of adjusting the fixing of the air- cooled box according to claim 1, characterized in that: The grouting baffle is a steel belt that is outwardly extended by 100 mm.

3. The method of adjusting the fixing of the space cold box according to claim 1, characterized in that: The anchor bolt box is an iron box formed by welding a square steel plate at the bottom, and the upper part of the anchor bolt box is a steel pipe.

4. The method of adjusting the fixing of the space cold box according to claim 1, characterized in that: In S5, the cold box is hoisted and positioned by using a steel wire rope slidable combined type balance lifting appliance and a width adjustable support balance beam, and by adopting double-machine lifting.

5. The method of adjusting the fixing of the space cold box according to claim 1, characterized in that: ​

Images