CN114439240A - Special construction scheme for loading granulated tower crane for blast furnace project slag treatment project - Google Patents

Abstract

The invention relates to a special construction scheme for loading a granulated tower crane for a blast furnace project slag treatment project, which comprises the following working procedures: and (3) carrying out a pre-hoisting assembly process, carrying out technical bottom-crossing work, knowing the structural condition of the project and the control condition of the horizontal and vertical coordinates in the plant, implementing the transportation process of responsibility operation responsible personnel, operating personnel and components, building a temporary assembly platform in advance, and avoiding the components from being damaged in the transportation process. According to the special construction scheme for loading the granulated tower crane for the blast furnace project slag treatment project, the components are planned in advance before being transported, delivery and matched supply are carried out according to hoisting requirements, smooth hoisting on site is ensured, unloading is organized in time after the components reach a construction site, the components can be hoisted to an assembly position to be directly hoisted to the assembly area, secondary transportation is reduced, hoisting machinery and transportation vehicles can be placed on the assembly position in sequence under the condition that the factory floor allows, the hoisting machinery and the transportation vehicles can be guaranteed to walk smoothly, and the components are assembled and hoisted nearby.

Description

Special construction scheme for loading granulated tower crane for blast furnace project slag treatment project

Technical Field

The invention relates to the technical field of special construction schemes for loading a granulated tower crane, in particular to a special construction scheme for loading a granulated tower crane for a blast furnace project slag treatment project.

Background

The blast furnace is made up of steel plate as shell, refractory brick lining is built in the shell, the body of the blast furnace is divided into five parts from top to bottom, namely furnace throat, furnace body, furnace waist, furnace belly and furnace hearth.

The granulation tower is a necessary use component in a blast furnace project slag treatment project, the operation field and the operation specification of the granulation tower are unreasonable in the installation process, the granulation tower is easily connected and fixed or potential safety hazards are generated during construction, in the current special construction scheme for the granulation tower crane, the key hoisting process cannot be accurately operated and controlled, the performance of the granulation tower cannot be maximally protected, the whole machine of the granulation tower cannot be exerted, and the whole operability of hoisting is reduced.

Disclosure of Invention

Technical problem to be solved

Aiming at the defects of the prior art, the invention provides a special construction scheme for loading a granulating tower crane for a blast furnace project slag treatment project, which has the advantages of reasonable planning before operation, stable hoisting overall and the like, and solves the problems that the operation field and the operation specification are unreasonable in the installation process, the granulation tower is easily connected and fixed or potential safety hazards are generated during construction, and the key hoisting process cannot be accurately operated and controlled in the current special construction scheme for loading the granulating tower crane.

(II) technical scheme

In order to achieve the purpose, the invention provides the following technical scheme: the special construction scheme of the granulated tower crane for the blast furnace project slag treatment project comprises the following procedures:

1) and (3) carrying out a preparation process before hoisting, carrying out technical bottom-crossing work, knowing the structural condition of the project and the control condition of horizontal and vertical coordinates in a factory, and implementing responsibility operation responsible personnel and operating personnel.

2) And in the transportation process of the components, a temporary assembly platform is erected by entering the field in advance, so that the components are prevented from being damaged in the transportation process.

3) Assembling the granulation tower on site, leveling the field in the field, selecting assembled steel wire ropes, and welding the granulation tower to finish hoisting to an installation position.

4) And (5) retesting the leveling points, marking and protecting the positioning axis, and performing closed measurement by using a level gauge.

5) And in the granulating tower field hoisting process, selecting a steel wire rope, a lifting lug and a crane, and configuring corresponding equipment according to use requirements.

6) And in the barrel hoisting process, the corresponding auxiliary line is popped out from the outer surface of the barrel, the foundation elevation is adjusted, the operation platform is assembled and disassembled, and the main body is installed and debugged.

Furthermore, the technical bottom-crossing work is done to ensure the high quality, high speed, safety and low consumption of the project, the bottom-crossing work is done in a grading way, the main content of the construction organization design, the overall arrangement of the project by a project manager, the operation technology bottom crossing of various processes, the safety and civilized construction and the surrounding environment condition which should be noticed by the project are carried out, the layering and item division bottom crossing are finally carried out on responsible operation responsible persons and operators, and the corresponding winter construction technical requirements are made.

Furthermore, according to the fact that the diameter of the granulating tower is 6.24-3.5 m, the height of bridges and culverts along the way and the height of an air pipe gallery are measured, the components are guaranteed not to collide in the loading, unloading and transporting process, the components are prevented from being damaged and deformed in the transporting process, the placing site is guaranteed to be flat after the components are transported in place, the site foundation is solid, weeds and accumulated water do not exist, and a certain safety distance is reserved between the components.

Further, leveling in the field, dredging a transportation road, selecting an automobile crane for unloading and assembling, selecting a proper diameter according to the stress of the steel wire rope and the allowable tension of the steel wire rope, and determining the number and the corresponding diameter of the steel wire rope after checking.

Furthermore, a positioning axis provided by a foundation construction unit or a construction unit is subjected to line inspection, recording is carried out, the positioning axis is marked and protected, a leveling instrument is used for carrying out closed measurement, and a leveling point is measured and arranged at a place where a nearby building is not prone to damage.

Further, the selection of the corresponding steel wire rope, the lifting lug and the crane is carried out, effective checking is carried out on the steel wire rope, whether the corresponding structure can meet the use requirement is checked, the diagonal weld strength checking and the diagonal weld are subjected to structural checking, the size and the appearance quality of a welding foot are controlled, the barrel is planned to be hoisted in sections according to the overlong and overweight of the whole barrel, the welding assembly is carried out on site, the welding misalignment meets the design requirement and the specification, and the hoisting is carried out after the assembly is completed in sections.

Further, barrel surface pops out installation center line, basic top surface line and terrace elevation to and the barrel top surface pops out the cross center line with the butt joint of upper segment barrel, whether correct buried bolt and check elevation with theodolite and spirit level and accord with the drawing requirement, barrel base leveling back, every group parallels all should compress tightly, and tap the listening inspection one by one with the hand hammer, all establish the steel cat ladder inside and outside the granulation tower, all need to install the cat ladder before the hoist and mount of one section barrel of every, the cat ladder both ends set up the hangers and adopt bolted connection with the hangers that the inboard symmetry of barrel set up, after the work is accomplished, carry out the successive layer from top to bottom and demolish the cat ladder.

Further, the installation requirement completes the installation step of the granulation tower, the operation is ensured to meet the standard requirement, the occurrence of human misoperation is avoided, the barrel is transported to the site and directly lifted off, and a skid is placed below the column base during lifting so as to prevent the friction with the ground.

Further, other sporadic components of the granulation tower are installed, the axis, the elevation and the like of the foundation are subjected to detailed inspection during installation, the record is made, whether the design requirements are met or not is rechecked, whether the cylinder distance is matched with the axis of the foundation or not is checked, and the whole safety and reliability of the granulation tower are guaranteed during hoisting connection.

Furthermore, the structural welding meets the use specification, the welding part of the whole structure is inspected, the cylinder body is painted, the surface coating film is firmly attached without the defects of falling, wrinkles, bubbles, pinholes and the like according to the design requirement and the current national standard, and the thickness of the coating layer meets the design standard.

(III) advantageous effects

Compared with the prior art, the technical scheme of the application has the following beneficial effects:

1. according to the special construction scheme for loading the granulated tower crane for the blast furnace project slag treatment project, the components are planned in advance before being transported, delivery and matched supply are carried out according to hoisting requirements, smooth hoisting on site is ensured, unloading is organized in time after the components reach a construction site, the components can be hoisted to an assembly position and directly hoisted to the assembly position, secondary transportation is reduced, hoisting machines and transport vehicles can be placed on the site in sequence under the condition that the site is allowed, the hoisting machines and the transport vehicles can walk smoothly, the components are assembled nearby and then hoisted, the working efficiency is improved, and the operation procedures are optimized.

2. The special construction scheme for loading the granulating tower crane for the blast furnace project slag treatment project is implemented by a foundation acceptance, a foundation paying-off, a preparation before hoisting and a temporary platform, the method comprises the steps of mounting a rest platform and a ladder, hoisting a first section of a granulation tower, adjusting elevation and verticality of a lower section, grouting a foundation, mounting a second section of a temporary platform and a temporary platform of the granulation tower, mounting the rest platform and the ladder, hoisting a third section of the granulation tower, adjusting verticality, temporarily fixing, welding, performing nondestructive testing, performing anticorrosion, sequentially analogizing to the tenth section of a cylinder body, checking and accepting, removing a temporary facility, cleaning a site, performing operation, completing an integral mounting task, and ensuring stable and normal operation of the device.

Detailed Description

The technical solutions in the embodiments of the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.

The special construction scheme for loading the granulated tower crane for the blast furnace project slag treatment project in the embodiment comprises the following procedures:

1) the method comprises the steps of preparing processes before hoisting, well preparing technical bottom-crossing work, ensuring the high quality, high speed, safety and low consumption of the project, well preparing bottom-crossing work in a grading mode, wherein the content of the bottom-crossing comprises the structural condition of the project, the control condition of horizontal and vertical coordinates in a factory, the main content of construction organization design, the overall arrangement of a project manager to the project, the bottom-crossing of the operation technology of each process of various workers, the safety, civilized construction and the surrounding environment condition which should be noticed by the project, performing the bottom-crossing in a layering mode, finally realizing the responsibility operation on a responsible person and an operator, and well preparing the technical requirements of the construction in winter:

1. baking the welding rod: the welding rod is always damaged due to moisture absorption, so that the arc is unstable, the spatter is increased, and the defects of air holes, cracks and the like are easily generated, therefore, the welding rod is strictly dried before use, the drying requirement of the welding rod is based on the using specification of the welding rod, the welding rod is dried and then placed in a heat preservation box with the temperature of 100-plus-150 ℃, the welding rod is taken at any time, the exposure of the welding rod is not more than 2 hours, the re-baking is carried out for more than 2 hours, the baking frequency of the welding rod is not more than 3 times, the welding time is selected to be carried out in the daytime as much as possible, and the welding work of a first-level welding line is carried out between 9 am and 4 pm;

2. in order to slow down the cooling speed of a weldment after welding and prevent cold cracks from being generated, when the temperature is lower than 5 ℃, preheating before welding and cooling after welding are adopted to reduce the deformation of welding residual stress, preheating is carried out in the range of 80-100MM respectively at two sides of a component groove to be welded, and the welding preheating temperature is controlled to be about 30 ℃;

3. preparing during steel structure welding: welding rod baking, groove inspection, electric arc leading-in, leading-out plate and steel backing plate and fixing by spot welding, removing the welding groove, the rust-proof paint and sundries around, preheating the welding port, and adopting two persons to carry out symmetrical welding simultaneously so as to reduce welding deformation and residual stress;

4. when the components are assembled, sundries such as rust, burrs, mud, oil stain, ice and snow and the like which are remained in the joints within 50mm are removed, and the joints are kept dry and have no residual moisture;

5. when a steel plate with the thickness of more than 9mm is welded at negative temperature, multilayer welding is adopted, welding seams are built up layer by layer from bottom to top, each welding seam is welded once, if welding is interrupted, welding defects are removed before welding is carried out again, preheating is carried out again, and arc striking on a welding base metal is strictly forbidden;

6. when the components are welded and installed on site, if the components meet snowy days or windy days above 6 grades, the operation is stopped, and unqualified welding seams are removed for re-welding;

7. when the environmental temperature is lower than 0 ℃, a brushing process test is carried out before the anticorrosive paint is brushed, rust, oil stain, burrs and other objects on the surface of the component are required to be cleaned and kept dry, and brushing work cannot be carried out in snowy days or when thin ice exists on the component;

8. anti-skid measures are taken during transportation and stacking of the structure in winter, the stacking site of the components is flat and solid without water pits, the ground is not frozen, the components are kept horizontal when the components of the same type are stacked, and the sizing blocks are placed on the same vertical line to prevent the components from slipping;

9. the surface of the component is cleaned of ice, snow and frost before installation, but the coating must not be damaged.

2) The transportation process of the components comprises the steps of measuring the height limit of bridges and culverts and an air pipe gallery along the way according to the fact that the diameter of a granulation tower is 6.24-3.5 m, building a temporary assembly platform before hoisting by construction teams and groups, ensuring that the components are not collided in the loading, unloading and transporting process, avoiding the components from being damaged and deformed in the transporting process, delivering the components according to the hoisting requirement program, considering matched supply, ensuring smooth hoisting on site, symmetrically placing the components on a transport vehicle, symmetrically operating when loading and unloading, ensuring the fixation of the vehicle body and the components on the vehicle, reserving a certain safety distance between the placed components and the components, leveling the placement site, firm foundation, no weeds and no water accumulation, organizing the unloading timely and reducing secondary transportation.

3) The method comprises the following steps of assembling a granulation tower on site, leveling the site in the site, dredging a transportation road, paving a local steel plate on the site of a western granulation tower, selecting an original concrete road for the site of the eastern granulation tower, selecting an automobile crane with corresponding tonnage for assembling, assembling the ground by butting 2m and 2m into a cylinder with the height of 4m, splicing 2 cylinders with the length of 4m into an 8m whole section (without unhooking) before hoisting, directly hoisting the assembled cylinder to an installation position after the welding is qualified through inspection, hoisting a heavy object, selecting a hoisting steel wire rope with the length of 6 multiplied by 37 and the length of 8m of a single cylinder, selecting a proper diameter according to the allowable tension of the steel wire rope according to the stress of the steel wire rope, and checking the selected steel wire rope.

4) The method comprises the following steps of surveying a leveling point again, wherein a positioning axis provided by a foundation construction unit or a construction unit is subjected to cross connection and line inspection together with the construction unit, a supervision unit, a civil engineering unit and other related units, recording is well carried out, the positioning axis is marked and protected, closed measurement is carried out by a level gauge according to a reference point provided by the construction unit, the leveling point is surveyed to a place where nearby buildings are not prone to damage, the interior of the buildings can also be surveyed, but the sight line is kept smooth, and meanwhile protection is needed.

5) The on-site hoisting process of the granulation tower,

1. selecting a steel wire rope, lifting a heavy object, selecting a 6X 37 lifting steel wire rope, selecting a proper diameter according to the stress of the steel wire rope and the allowable tension of the steel wire rope, and checking the selected steel wire rope, wherein the length of a single steel wire rope is 8 m.

2. The selection of lug, the hoisting point adopts the lug connected mode, the lug material is Q345B, 18mm is thick, set up 4 lugs, the lug is calculated according to 11.6.2 in "steel construction design standard" GB50017-2017, 11.6.3, accomplish lug structure checking, lug tip section tensile (split) intensity checking, lug shear strength checking and lug fillet weld checking, and the fillet weld intensity is checked and fillet weld structure inspection is carried out to the fillet weld intensity, ensure that the obtaining of welding seam is checked and accepted.

3. The selection of a crane is realized, the actual construction barrel length of an east-west granulation tower is 64.8m, the barrel is combined by plates with various specifications, the whole barrel is overlong and overweight, the barrel is planned to be hoisted in sections, the section assembling and welding are carried out on site, the welding misalignment meets the design requirements and specifications, the barrel is hoisted after the section assembling is completed, a temporary platform and a ladder stand erected on the barrel are installed on a shell before the barrel is hoisted, the internal and external steel structures of the barrel are installed in a processing plant and are transported to the site to be hoisted after the welding is completed, the corresponding crawler crane is selected according to the characteristics of the barrel to hoist, the integral conformity with the safety specifications is ensured, and the integral safety is ensured.

6) Barrel hoist and mount process pops out installation center line, basic top surface line and terrace mark altitude at the barrel surface, still pops out the cross center line with the butt joint of upper segment barrel in addition at the barrel top surface, marks the center sign and the 1m mark altitude sign that mainly are the component:

1. marking the sample punching hole according to the process requirement in the manufacturing process, and marking by a triangular symbol of the sample punching hole during coating; marking the central line of the column at the position, which is 300mm away from the upper end face and the lower end face of the cylinder body, on the cross surface of the cylinder body, and marking the 1m high line at the position, which is 1000mm away from the upper end face of the cylinder body;

2. the triangle used for marking the central line and the elevation line position is an equilateral triangle with the side length of 50mm, the interior of the equilateral triangle is filled with white paint, and the inspection indexes are the color of the paint and the standardization of the triangle symbol;

3. ensuring the relative position between the triangular mark and the sample punching hole in the central line mark and the marking line mark;

4. all the marked characters are white, white paint can be used, and the inspection index is the paint color;

5. for the identification of the component, when the finished product is finally inspected, 100% inspection is required to be carried out, and each mark (such as punching and punching) is ensured to be correctly marked;

adjusting the basic elevation and checking the embedded bolts: the method comprises the steps of correcting the embedded bolts by using a theodolite and a leveling instrument and checking whether elevation meets the requirement of a drawing, wherein each sizing block group does not exceed 5 sizing blocks, when the sizing blocks are placed, the thick sizing blocks are placed below and the thin sizing blocks are placed in the middle, all the filling blocks are welded firmly by using positioning welding, each sizing block group is placed neatly and stably and is in good contact, after a barrel base is leveled, each sizing block group is pressed tightly, a hand hammer is used for carrying out group-by-group tapping listening check, the end face of each sizing block is exposed out of the outer edge of the bottom face of the base, the flat sizing block is exposed out of 10-30mm, and the inclined sizing block is exposed out of 10-50 mm.

Work platform and mounting of climbing ladder set

Installing an operation platform: the operation platform chooses angle steel less than 50X 5 to make into the mobile jib, and platform width 1000mm, and the operation platform is articulated by barrel hangers and platform hangers cooperation, sets up eight hangers on the platform, chooses for use 12mm thick steel plate preparation, and annular operation platform of a week, operation platform is demolishd with calabash cooperation loop wheel machine after the operation finishes.

Assembling and disassembling the crawling ladder; ladder stand equipment: all establish the steel cat ladder inside and outside the granulation tower, the cat ladder adopts angle 30 4 angle steel, the horizontal pole is marked time and is adopted 12 steel bar welding, all need to install the cat ladder before every 4 meters one section barrel hoist and mount, the cat ladder both ends set up the hangers and adopt bolted connection with the hangers that the inboard symmetry of barrel set up, from top to bottom by the platform, because the barrel has spiral reinforcement muscle more than 38.0m elevation, so need hide spiral reinforcement muscle when the welding steel pipe, each belted steel pipe need be a straight line to set up the safety hook pair on the cat ladder, the cat ladder demolishs: the ladder stand is dismantled from top to bottom in sequence, and can be dismantled by a method of dismantling the bolts layer by layer.

Installation requirements and processes:

the installation process of the granulation tower comprises the following steps: checking and accepting a foundation, paying off the foundation, preparing before hoisting, installing a temporary platform, a rest platform and a ladder, hoisting one section of a granulation tower, adjusting the elevation and the verticality of the lower section, grouting the foundation, installing the temporary platform, the rest platform and the ladder, adjusting the verticality, temporarily fixing, welding, performing nondestructive testing, performing anticorrosion, sequentially analogizing to the installation of the barrel at the tenth section, checking and accepting, dismantling the temporary facility, cleaning the site, and performing the operation

The cylinder is transported to the site and directly lifted off, and a skid is placed below the column foot during lifting so as to prevent the cylinder from rubbing the ground;

1. the length is checked, and the installation can be carried out only if the sizes of the basic space, the actual length of the cylinder and the design drawing are uniform and are not consistent;

2. when the first section of the granulating tower is installed, the U-shaped opening of the base is matched and paired with the bolt in the embedded concrete, and the second belt cylinder body can be installed after the granulation tower is firmly installed;

3. when the second section of the granulation tower is installed, four cable wind ropes are adopted to adjust the verticality, the barrel misalignment amount meets the design requirement and specification, after the verticality is adjusted, tack welding is immediately carried out symmetrically along the periphery, the length of the tack welding is 30-50mm, the upper and lower sections of the barrel are reinforced by using a horse plate, and the horse plate is cut off after the welding is finished;

4. after the two sections of cylinders are installed, flaw detection treatment is immediately carried out, if the two sections of cylinders are unqualified, a carbon arc air gouging gun or a polishing machine is used for gouging the unqualified welded junctions and welding the unqualified welded junctions again until the requirements of flaw detection are met;

5. after flaw detection is qualified, the interior and exterior of the joint weld and other paints during installation are repaired in time at the damaged part, and coating is carried out according to the requirements of a drawing;

6. the painted surface should also prevent the damage of foreign objects;

7. in the field installation process, arc striking in a non-welding area is strictly prohibited, and the damage to the painting surface is reduced as much as possible;

8. certain measures for receiving welding slag are taken in the field welding process, so that the damage of welding sparks to the coated surface is reduced;

9. after the installation is finished, the site is immediately cleaned, and before the installation is formally handed to the Party A, a specially-assigned person is dispatched to patrol and monitor the site, so that the site is prevented from being damaged by other unit construction operations;

and (3) mounting other sporadic components:

platform installation: the 2.5m platform, other members of each layer of rod pieces, the spiral plate and the like are installed in a mode of assembling into a whole in a processing plant.

The component mounting technical measures are as follows:

1. during installation, detailed inspection is carried out on the basic axis, the elevation and the like, a record is made, whether the design requirements are met or not is rechecked, and whether the cylinder distance is matched with the basic axis or not is checked;

2. all the components are stacked and piled up stably, the unstable components are supported or fixed, the parallel distance between the components exceeding the height of the components is larger than the height of the components, the multi-meter fender type continuous collapse is avoided, the placement of the components is required to be stable and neat, and the stacking is not more than two layers;

3. numbering various components before leaving the factory, facilitating number matching and seating, and ensuring accuracy;

4. when all components are installed, intensity checking calculation is required, and the components cannot be estimated by self according to experience;

5. the machine operator must strictly follow the operating rules of each post to avoid hurting the operator and others, and should make corresponding signs, signals and warnings on the hazard source to avoid accidental damage to the field personnel;

6. the rigging and the lifting appliance need to be checked regularly and the rated load cannot be exceeded; when welding the component, the hoisting rigging cannot be connected, the steel rope thrown by the hoisting rigging cannot be used, and the normally worn steel wire is updated according to the regulation;

7. the hoisting machinery correctly selects the tonnage of the truck crane according to the weight of the component, the hoisting height and the turning radius;

8. during hoisting, people cannot stand within the mechanical turning radius, overhead workers must tie double-hook safety belts, and the ladder feet of the ladder, which are not allowed to be thrown and used for ascending and descending high altitude, are padded firmly by screws and tools.

Welding and welding inspection:

1. the welder should take an examination and can work on the welding work after obtaining the certification, and the certification should indicate the welding condition and the valid period;

2. during welding, a welding rod with a coating falling off or a welding core rusting, a flux which is moistened and agglomerated and a slag shell which is melted and burnt cannot be used;

3. before the welding wire and the welding rod are used, oil stains and iron rust are removed;

4. before welding, a welder needs to check the quality of a welding joint and the treatment condition of a welding area again, and when the welding joint does not meet the requirement, the welding can be performed after the welding joint is qualified through trimming;

5. butt joints such as butt joints, T-shaped joints, angle joints, cross joints and the like, and butt joint and angle joint combined welds, arc striking plates are arranged at two ends of the welds, the materials and the groove form of the arc striking plates are the same as those of a weldment, and the arc striking plates are cut by gas cutting, polished and leveled after welding and do not need to be knocked down by a hammer;

6. when welding, a welder follows the welding process and does not perform arc striking on the base metal outside a welding bead;

7. continuously welding multiple layers, and performing electric arc and gouging or performing back gouging by using an angle grinder after welding each layer of welding bead, and welding after removing defects;

8. when welding defects such as cracks appear on the welding seam, a welder cannot handle the welding defect freely, needs to check the reason, and can handle the welding defect after a repairing process is formulated;

9. the number of times of repairing the same part of the welding line is not more than two, and when the number of times of repairing the same part of the welding line is more than two, the repairing process is carried out;

10. after welding, a welder should clean slag on the surface of the welding seam and splashes on two sides of the welding seam, and check the appearance quality of the welding seam.

Coating:

1. painting of the cylinder body is required to meet the design requirements and the regulations of the national current standard 'acceptance standard for construction quality of steel structure engineering';

2. the coating should have a manufacturer's quality certificate;

3. before painting, dirt such as rust, welding slag, burrs, oil, water and the like on the painted surface is removed;

4. the coating, the coating pass and the coating thickness all meet the design requirements, the coating used on the same day is configured on the same day, and a diluent cannot be added randomly;

5. the environmental temperature and the relative humidity during coating are in accordance with the requirements of the specification of a coating product, when the specification of the product is not required, the environmental temperature is preferably between 5 and 38 ℃, the relative humidity is not more than 85 percent, the coating cannot be carried out when the surface of a component is dewed, and the member cannot be drenched within 4 hours after the coating;

6. the damaged paint in the transportation and installation process is coated and repaired on site, each belt is installed and fastened, the surface of all components is required to be coated, the coating layer is uniform, the color is consistent, the coating film is firmly attached, the defects of falling, wrinkles, bubbles, pinholes and the like are avoided, and the thickness of the coating layer meets the design standard.

Selecting a checking formula for the steel wire rope for assembly in the on-site assembly process of the granulation tower: s ≦ F/n

Maximum working static tension of S-steel cable

F-breaking tension of selected wire rope

n-safety factor of wire rope (n ═ 6)

1kg＝10N

Assembled on site with the maximum weight not more than 8 tons, namely 80KN

80KN≦133KN/6*4

4 steel wire ropes with the diameter of 16.0mm can be selected to complete the assembly in the field.

The selection and checking formula of the steel wire rope in the field assembling process of the granulation tower is as follows: s ≦ F/n

Maximum working static tension of S-steel cable

F-breaking tension of selected wire rope

n-safety factor of wire rope (n ═ 8)

1kg＝10N

Hoisting on site for a period of no more than 27 tons, namely 270KN, 270KN ≦ 599KN/8 x 4

4 steel wire ropes with the diameter of 34.0mm are selected.

Angle welding seam strength checking calculation for on-site assembling process of granulation tower

Effective area: a ═ 440-2X 10. times.7X 2 ═ 5880mm2 ═ 58.8cm2

Under the action of Vx: vx, A, 80, 58, 8, 10, 13.605MPa

Normal stress under axial force: 46.2/58.8 × 10 7.8571MPa for σ N/a

Angular point maximum integrated stress:

and sigma m [ (sigma N/beta f)2+ sigma VX2]0.5 [ (7.8571/1)2+13.6052]0.5 15.711MPa and less than or equal to 200MPa, so that the requirement is met.

Granulation tower on-site assembly process fillet weld structure inspection

Fillet weld lug plate minimum thickness: tmin 18mm

Construction requires maximum leg height: hfmax is 1.2 Tmin is 21.6mm which is more than or equal to 10mm, meets the requirement,

construction requires minimum fillet height: hfmin 1.5 Tmax0.5 6.364mm 10mm to meet the requirement,

the welding seam should be checked, the quality grade of the fillet weld is three grades, and the size and the appearance quality of the welding leg must be controlled.

The working principle of the above embodiment is as follows:

(1) the method has the advantages that the components are planned in advance before being transported, delivery is carried out according to hoisting requirement procedures, supporting supply is carried out, smooth hoisting on site is guaranteed, unloading is organized in time after the components reach a construction site, the components can be directly hoisted to an assembling position to an assembling area, secondary transportation is reduced, the components can be placed on the hoists in sequence under the condition that the factory and the transportation vehicles can run smoothly, hoisting is carried out after assembling nearby the components, the working efficiency is improved, and the operation process is optimized.

(2) The method comprises the steps of checking and accepting a foundation, paying off the foundation, preparing before hoisting, installing a temporary platform, a rest platform and a ladder, hoisting one section of a granulation tower, adjusting the elevation and the verticality of the lower section, grouting the foundation, installing the temporary platform, the rest platform and the ladder on the second section of the granulation tower, adjusting the verticality, temporarily fixing, welding, performing nondestructive testing, performing anticorrosion, sequentially analogizing to the tenth section of a cylinder body after the installation, checking and accepting, dismantling temporary facilities, cleaning a site, and performing operation, so that the integral installation task is completed, and the stable and normal operation of the device is ensured.

(3) The granulation tower is more reasonable in operation field and operation specification in the installation process, potential safety hazards are not easily caused when the granulation tower is fixedly connected or constructed, accurate operation and control can be performed on key hoisting procedures in the current special construction scheme of granulation tower crane installation, the granulation tower can be protected to the maximum extent and the whole machine can be exerted, and the whole operability of hoisting is improved.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.

Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.

Claims (10)

1. The special construction scheme of the granulated tower crane for the blast furnace project slag treatment engineering is characterized in that: comprises the following procedures:

1) and (3) carrying out a preparation process before hoisting, carrying out technical bottom-crossing work, knowing the structural condition of the project and the control condition of horizontal and vertical coordinates in a factory, and implementing responsibility operation responsible personnel and operating personnel.

2) And in the transportation process of the components, a temporary assembly platform is erected by entering the field in advance, so that the components are prevented from being damaged in the transportation process.

3) Assembling the granulation tower on site, leveling the field in the field, selecting assembled steel wire ropes, and welding the granulation tower to finish hoisting to an installation position.

4) And (5) retesting the leveling points, marking and protecting the positioning axis, and performing closed measurement by using a level gauge.

5) And in the granulating tower field hoisting process, selecting a steel wire rope, a lifting lug and a crane, and configuring corresponding equipment according to use requirements.

6) And in the barrel hoisting process, the corresponding auxiliary line is popped out from the outer surface of the barrel, the foundation elevation is adjusted, the operation platform is assembled and disassembled, and the main body is installed and debugged.

2. The special construction scheme of the granulated tower crane for the blast furnace project slag treatment engineering according to claim 1, which is characterized in that: the technical bottom-crossing work is done in a grading way, the main content of construction organization design, the overall arrangement of the project by a project manager, the operation technical bottom-crossing of various processes, the safety and civilized construction and the surrounding environment condition which should be noticed by the project are carried out, the layered and item-divided bottom-crossing is finally carried out on responsible operation responsible persons and operating personnel, and the corresponding winter construction technical requirements are made.

3. The special construction scheme of the granulated tower crane for the blast furnace project slag treatment engineering according to claim 1, which is characterized in that: according to the method, the limitation of the heights of bridges and culverts along the way and the air pipe gallery is measured according to the diameter of the granulation tower of 6.24-3.5 m, the components are ensured not to collide in the loading, unloading and transporting process, the components are prevented from being damaged and deformed in the transporting process, the placing site is ensured to be flat after the components are transported in place, the site base is solid, no weed exists, no water is accumulated, and a certain safety distance is reserved between the components.

4. The special construction scheme of the granulated tower crane for the blast furnace project slag treatment engineering according to claim 1, which is characterized in that: and leveling in the field, dredging the transportation road, selecting an automobile to unload and assemble, selecting a proper diameter according to the stress of the steel wire rope and the allowable tension of the steel wire rope, and determining the number and the corresponding diameter of the steel wire rope after checking.

5. The special construction scheme of the granulated tower crane for the blast furnace project slag treatment engineering according to claim 1, which is characterized in that: and (3) switching a test line to a positioning axis provided by a foundation construction unit or a construction unit, recording, marking and protecting the positioning axis, carrying out closed measurement by using a level gauge, and measuring and setting a leveling point to a place where nearby buildings are not easy to damage.

6. The special construction scheme of the granulated tower crane for the blast furnace project slag treatment engineering according to claim 1, which is characterized in that: the steel wire rope, the lifting lug and the crane which correspond to each other are selected and effectively checked to check whether the corresponding structure of the steel wire rope, the lifting lug and the crane can meet the use requirement or not, the diagonal weld strength check and the fillet weld are subjected to structural check, the size and the appearance quality of a welding foot are controlled to be overlong and overweight according to the whole barrel, the barrel is planned to be hoisted in sections, the subsection group welding is carried out on site, the welding misalignment meets the design requirement and the specification, and the subsection group is hoisted after the completion.

7. The special construction scheme of the granulated tower crane for the blast furnace project slag treatment engineering according to claim 1, which is characterized in that: the installation central line is popped out to the barrel surface, basic top surface line and terrace elevation to and the barrel top surface pops out the cross central line with the butt joint of upper segment barrel, whether accord with the drawing requirement with theodolite and spirit level correction embedded bolt and inspection elevation, behind the barrel base leveling, every group parallels all should compress tightly, and group by group is flicked with the hand hammer and is listened the sound inspection, the steel cat ladder is all established inside and outside the granulation tower, all need to install the cat ladder before one section barrel of hoist and mount of every, the cat ladder both ends set up the hangers and adopt bolted connection with the hangers that the inboard symmetry of barrel set up, after the work is accomplished, carry out the successive layer from the top down and demolish the cat ladder.

8. The special construction scheme of the granulated tower crane for the blast furnace project slag treatment engineering according to claim 1, which is characterized in that: the installation requirement completes the installation step of the granulation tower, ensures that the operation meets the standard requirement, avoids the occurrence of human misoperation, and directly hoists away when the cylinder is transported to the site, and a skid is placed below the column foot during hoisting so as to prevent the friction with the ground.

9. The special construction scheme of the granulated tower crane for the blast furnace project slag treatment engineering according to claim 1, which is characterized in that: the method is characterized in that other sporadic components of the granulation tower are installed, the basic axis, the elevation and the like are subjected to detailed inspection when the granulation tower is installed, the record is made, whether the record meets the design requirement or not is rechecked, whether the cylinder distance is matched with the basic axis or not is checked, and the safety and the reliability of the whole granulation tower are guaranteed when the granulation tower is hoisted and connected.

10. The special construction scheme of the granulated tower crane for the blast furnace project slag treatment engineering according to claim 1, which is characterized in that: the welding of the structure meets the use specification, the welding part of the whole structure is inspected, the cylinder body is painted, the surface coating film is firmly attached according to the design requirement and meets the current national standard, the defects of falling, wrinkles, bubbles, pinholes and the like are avoided, and the thickness of the coating layer meets the design standard.