CN112127477A

CN112127477A - Large-scale steel-making high-span solid-web type steel column and installation method thereof

Info

Publication number: CN112127477A
Application number: CN202011187137.4A
Authority: CN
Inventors: 房政; 范前东; 郑治飞; 张俊
Original assignee: China MCC17 Group Co Ltd
Current assignee: China MCC17 Group Co Ltd
Priority date: 2020-10-30
Filing date: 2020-10-30
Publication date: 2020-12-25

Abstract

The invention discloses a large-scale steel-making high-span solid web type steel column and an installation method thereof, and belongs to the technical field of installation of steel columns of plants. According to the structural form, the weight and the length of the solid-web steel column and relevant parameters such as the rated lifting capacity of a crane, the steel column is reasonably manufactured in a segmented mode and is divided into a lower column I, a lower column II, an upper column III and an upper column IV. Firstly, retesting a foundation, arranging a base plate, fastening a foundation bolt after the lower column I is aligned to be qualified, and then installing a lower column II; installing inter-column supports, frame beams and platform beams on the lower-column double-limb solid-web type units; then, grouting between the lower column I and the foundation; and installing an upper column III, installing the frame beam and the platform beam connected with the upper column III, and finally installing an upper column IV. The whole process is safe and reliable, the installation efficiency and the installation precision of the steel column are effectively improved, the installation welding process is guaranteed to be carried out alternately, the installation operation surface is enlarged, the construction period is shortened, and the cost is reduced.

Description

Large-scale steel-making high-span solid-web type steel column and installation method thereof

Technical Field

The invention relates to the technical field of installation of steel columns of plants, in particular to a large-scale steel-making high-span solid-web steel column and an installation method thereof.

Background

In the installation process of the steel structure of the existing large-scale steel-making main plant, a steel-making converter bay plant is of a multi-layer high-bay frame structure, so that a plurality of planes and three-dimensional cross operations are performed, the structure is high in height, the high-altitude operation amount is large, and in order to ensure that a steel column can have a sufficient supporting effect, the steel column is generally divided into multiple sections in the actual production process, and on one hand, the production of the whole steel column is facilitated; on the other hand, the steel column is in the installation process, so that the hoisting is convenient.

Such as Chinese patent numbers: ZL 201310397566.8, date of authorized bulletin: 11/4/2015, the invention creates the name: the utility model provides an installation method for large-scale steel construction factory building steel skeleton, the installation method of this application adopts alignment earlier, fixed bottom segment segmentation steel column, then set up the interim operation platform that facilitates the installation operation effect, assemble and use auxiliary device at the top of the bottom segment segmentation steel column of alignment, fixed each check, so can guarantee the safety of installation operation, swift and convenient, simultaneously, because each steel column falls into two sections or three-section or even more multistage and installs, thereby make lifting device can select the medium-sized equipment that the lifting capacity is less, and then can reduce lifting device's installation expense by a large amount.

Although the application also adopts a multi-section installation method to install the steel column, the application does not limit the number of specific segmentation sections of the steel column and does not limit the specific segmentation sections, so that in the actual construction process, if the number of the segmentation sections is small, the heavy steel column is easy to be hoisted secondarily in the hoisting process; if the number of the divided sections is large, the steel column is convenient to hoist in the subsequent installation process, but the installation accuracy of the steel column is easy to reduce in the welding process, so that further improvement is needed.

Disclosure of Invention

1. Technical problem to be solved by the invention

The invention aims to overcome the problem that the steel column is unreasonably segmented in the prior art, and provides a large steel-making high-span solid-web steel column and an installation method thereof; according to the invention, the whole steel column is reasonably divided into four sections, so that the installation times among the columns are reduced on the basis of ensuring the convenience in hoisting, and the installation precision of the whole steel column is ensured; in addition, the height of the lower column I and the height of the lower column II which are positioned at the bottom end are limited, the length between the columns is limited, and the production cost is reduced while the sufficient bearing capacity is guaranteed.

2. Technical scheme

In order to achieve the purpose, the technical scheme provided by the invention is as follows:

the large-scale steel-making high-span solid-web steel column comprises a lower column double-limb solid-web unit and an upper column single-limb solid-web unit, wherein the lower column double-limb solid-web unit is divided into a lower column I and a lower column II; the upper column single-limb solid abdominal type unit is divided into an upper column III and an upper column IV, the height of the lower column I is 1.25-1.35 times that of the lower column II, the length of the lower column I is equal to that of the lower column II, the length of the upper column III is 1/2 of the length of the lower column II, and the length of the upper column IV is 1/2 of the length of the upper column III.

As a further improvement of the invention, the upper column III is arranged on one side of the lower column II, and the upper column IV is arranged on the other side of the upper column III.

As a further improvement of the invention, the lower column I comprises a main web plate I, web plates I and flange plates I, wherein two ends of the main web plate I are respectively provided with one web plate I, and the main web plate I and the two web plates I form an I-shaped structure; a flange board I is respectively installed at the both ends of web I, web I constitutes I shape structure with the flange board I of installing at I both ends of this web.

As a further improvement of the invention, two T-shaped plates I are fixedly arranged on two side surfaces of the middle part of the main web plate I respectively, one vertical end of each T-shaped plate I is connected with the side surface of the main web plate I, and the height of each T-shaped plate I is the same as that of the main web plate I; a plurality of main rib plates I are welded in an area defined by the T-shaped plate I, the main web plate I, the web plate I and the flange plate I, and the plurality of main rib plates I are arranged at equal intervals along the length direction of the lower column I; the welding has a side wall board I between two flange boards I that lie in on same web I, side wall board I is equipped with a plurality ofly, and a plurality of side wall boards I set up along the equidistant length direction of lower post I, side wall board I is located the one end of keeping away from T template I.

As a further improvement of the invention, the lower column II comprises a main web II, a web II and a flange plate II, wherein two ends of the main web II are respectively provided with the web II, and the main web II and the two webs II form an I-shaped structure; and two ends of the web II are respectively provided with a flange plate II, and the web II and the flange plates II arranged at the two ends of the web II form an I-shaped structure.

As a further improvement of the invention, two T-shaped plates II are fixedly arranged on two side surfaces of the middle part of the main web plate II respectively, one vertical end of each T-shaped plate II is connected with the side surface of the main web plate II, and the height of each T-shaped plate II is the same as that of the main web plate II; a plurality of main rib plates II are welded in an area defined by the T-shaped plate II, the main web plates II, the web plates II and the flange plates II, and the plurality of main rib plates II are arranged at equal intervals along the length direction of the lower column II; a side rib plate II is welded between two flange plates II on the same web plate II, the side rib plate II is provided with a plurality of side rib plates II, the plurality of side rib plates II are arranged along the length direction of the lower column II at equal intervals, and the side rib plates II are located at one end far away from the T-shaped plate II.

As a further improvement of the invention, the upper column III is arranged at the upper end of the lower column II and comprises a web plate III and flange plates III, two ends of the web plate III are respectively provided with one flange plate III, and the web plate III and the two flange plates III form an I-shaped structure; the flange plate III corresponds to the web plate II of the lower column II, a main rib plate III is welded in the area defined by the web plate III and the flange plate III, the main rib plate III is provided with a plurality of main rib plates III, and the plurality of main rib plates III are arranged at equal intervals along the length direction of the upper column III.

As a further improvement of the invention, the height of the web II and the flange plate II at one end of the lower column II is higher than that of the web II and the flange plate II at the other end, and the height of the lower column II is higher than that of the upper column III of 1/5-1/4.

As a further improvement of the invention, the upper column IV is arranged at the upper end of the upper column III and comprises a web IV and flange plates IV, two ends of the web IV are respectively provided with one flange plate IV, and the web IV and the two flange plates IV form an I-shaped structure.

A method for mounting a large-scale steel-making high-span solid-web steel column comprises the following steps: step a, retesting the foundation and arranging a backing plate at a corresponding position;

b, fastening foundation bolts after the foundation of the lower column I is aligned to be qualified;

c, mounting a lower column II at the upper end of the lower column I;

d, mounting the inter-column supports, the frame beams and the platform beams among the columns of the lower-column double-limb solid-web type unit to form a stable space structure system; grouting between the lower column I and the foundation;

step e, an upper column III is arranged at the upper end of the lower column II;

f, mounting the frame beam and the platform beam connected with the upper column III to form a stable space structure system;

and g, mounting an upper column IV at the upper end of the upper column III.

3. Advantageous effects

Compared with the prior art, the technical scheme provided by the invention has the following remarkable effects:

(1) according to the large-scale steel-making high-span solid-web steel column, the whole steel column is reasonably divided into four sections, so that secondary hoisting is avoided as much as possible on the basis of ensuring the convenience in hoisting, and meanwhile, the installation times among the columns are reduced, so that the installation accuracy of the whole steel column is ensured; in addition, the height between the lower column I and the lower column II at the bottom end is limited, and the length between the columns is limited, so that the whole steel column has enough bearing capacity and the production cost is reduced;

(2) according to the large-sized steel-making high-span solid-web steel column, the upper column III is arranged on one side of the lower column II, the upper column IV is arranged on the other side of the upper column III, namely the lower column II and the upper column IV are respectively arranged on two sides of the upper column III to form staggered installation, and when a travelling crane and other devices are subsequently installed, the structure ensures that the gravity center can be relatively deviated to the center of the whole steel column, so that the bearing capacity of the whole steel column is improved;

(3) according to the large-scale steel-making high-span solid-web steel column, all columns are designed into I-shaped structures, so that the production and installation cost of the whole steel column is reduced as much as possible on the premise that the steel column has enough bearing capacity in the construction process of the whole steel column;

(4) according to the large steel-making high-span solid-web steel column, the lower column I and the lower column II are provided with the corresponding T-shaped plates, the main rib plates and the side rib plates, so that the bearing capacity of the corresponding columns can be further enhanced, and the subsequent installation of devices such as an upper column III, an upper column IV and a travelling crane is facilitated.

(6) According to the installation method of the large-sized steel-making high-span solid-web steel column, the whole steel column is reasonably designed into four sections, so that the installation times between the columns are small in the whole steel column building process, the error of the whole installation process is reduced, the installation precision of the steel column is ensured, and meanwhile, secondary hoisting is avoided as far as possible on the basis of ensuring convenience in hoisting.

Drawings

FIG. 1 is a schematic structural view of a large steel-making high-span solid-web steel column according to the present invention;

FIG. 2 is a schematic cross-sectional view taken along line A-A of FIG. 1;

FIG. 3 is a schematic cross-sectional view taken along line B-B of FIG. 1;

FIG. 4 is a schematic cross-sectional view taken at I-I in FIG. 3;

FIG. 5 is a schematic cross-sectional view taken at C-C in FIG. 1;

FIG. 6 is a schematic cross-sectional view taken along line II-II of FIG. 5;

FIG. 7 is a schematic cross-sectional view taken along line D-D of FIG. 1;

FIG. 8 is a schematic cross-sectional view taken along line E-E of FIG. 1;

fig. 9 is a schematic sectional view at F-F in fig. 1.

The reference numerals in the schematic drawings illustrate:

10. a lower column I; 11. a main web plate I; 12. a web plate I; 13. a flange plate I; 14. a T-shaped plate I; 15. a side rib plate I; 16. a main rib plate I; 17. reinforcing ribs;

20. descending a column II; 21. a main web II; 22. a web II; 23. a flange plate II; 24. a T-shaped plate II; 25. a side rib plate II; 26. a main rib plate II; 27. adding a rib plate; 28. an upper top plate II;

30. putting the column III; 31. a web III; 32. a flange plate III; 33. a main rib plate III; 34. an upper top plate III;

40. putting the column on the IV; 41. a web IV; 42. a flange plate IV;

50. a foundation; 51. a base plate;

61. unloading lifting lugs; 621. hoisting the first lifting lug; 622. hoisting a second lifting lug; 623. hoisting a lifting lug III;

70. an operation platform;

80. the temporary ladder is climbed.

Detailed Description

For a further understanding of the invention, reference should be made to the following detailed description taken in conjunction with the accompanying drawings and examples.

Examples

With reference to fig. 1, the large steel-making high-span solid-web steel column of the embodiment includes a lower-column double-limb solid-web unit and an upper-column single-limb solid-web unit, which are sequentially mounted on a foundation 50, and the lower-column double-limb solid-web unit is divided into a lower column i 10 and a lower column ii 20; the upper column single limb solid abdominal type unit is divided into an upper column III 30 and an upper column IV 40, and the height of the lower column I10 is 1.25-1.35 times of that of the lower column II 20, and can be 1.25, 1.28, 1.30 … … 1.33.33 or 1.35 times.

Preferably, the height of lower column I10 is 1.26 times that of lower column II 20.

In addition, as shown in fig. 1, the length of the lower column i 10 and the length of the lower column ii 20 of the present embodiment are equal, the length of the upper column iii 30 is 1/2 of the length of the lower column ii 20, and the length of the upper column iv 40 is 1/2 of the length of the upper column iii 30. The widths of the lower column I10, the lower column II 20, the upper column III 30 and the upper column IV 40 are all the same.

It is worth to be noted that, for a large steel-making factory building, the whole height of the factory building is high, and large-scale devices such as traveling cranes and the like need to be installed on steel columns, so that the whole steel column is required to have large bearing capacity, because the lower column I10, the lower column II 20, the upper column III 30 and the upper column IV 40 of the steel column are sequentially installed on the foundation 50, when bearing, the lower column I10 and the lower column II 20 mainly bear large loads, and on the basis of reducing the production cost, the lengths of the lower column I10 and the lower column II 20 are controlled, so that the widths of the lower column I10 and the lower column II are longer than those of the upper column III 30 and the upper column IV 40, and further, the whole length of the steel column is in a descending form from bottom to top, so that the production cost is further reduced.

In addition, rationally divide into four sections with whole steel column, on guaranteeing hoist and mount convenient basis, avoid secondary hoist and mount as far as, reduce the installation number of times between each cylinder simultaneously to guarantee the installation accuracy of whole steel column.

With reference to fig. 1, the upper column iii 30 is disposed on one side of the lower column ii 20, and the upper column iv 40 is disposed on the other side of the upper column iii 30, that is, the lower column ii 20 and the upper column iv 40 are disposed on two sides of the upper column iii 30, respectively, to form a staggered installation.

With reference to fig. 1 and 2, the lower column i 10 of the present embodiment includes a main web i 11, a web i 12 and a flange plate i 13, wherein two ends of the main web i 11 are respectively provided with the web i 12, and the main web i 11 and the two webs i 12 form an i-shaped structure; a flange board I13 is respectively installed at the both ends of web I12, web I12 and the flange board I13 of installing at this web I12 both ends constitute the I shape structure.

Furthermore, in order to improve the bearing capacity of the lower column I10, T-shaped plates I14 are fixedly arranged on two side surfaces of the middle part of the main web plate I11 respectively, one vertical end of each T-shaped plate I14 is connected with the side surface of the main web plate I11, and the height of each T-shaped plate I14 is the same as that of the main web plate I11; a plurality of main rib plates I16 are welded in an area defined by the T-shaped plate I14, the main web plates I11, the web plates I12 and the flange plates I13, and the plurality of main rib plates I16 are arranged at equal intervals along the length direction of the lower column I10; be located the welding between two flange boards I13 on same piece web I12 and have a side floor I15, side floor I15 is equipped with a plurality ofly, and a plurality of side floors I15 set up along the equidistant interval of length direction of lower post I10, side floor I15 is located the one end of keeping away from T template I14.

In order to facilitate hoisting of the lower column I10, with reference to fig. 1, 2, 3 and 4, a plurality of pairs of unloading lifting lugs 61 are symmetrically arranged on one side of the main web I11, the unloading lifting lugs 61 are arranged at equal intervals along the length direction of the lower column I10, and the unloading lifting lugs 61 of the embodiment are located in an area defined by the main web I11, the web I12 and the flange plate I13, specifically referring to fig. 2.

In addition, with reference to fig. 3 and 4, a first lifting lug 621 is installed at the top of the lower column i 10, and since the lower column i 10 is generally heavier in weight, 4 first lifting lugs 621 are provided, and the 4 first lifting lugs 621 are symmetrically arranged on the main web plate i 11 in pairs, and the bottom ends of the first lifting lugs 621 are connected with the upper surface of the corresponding main rib plate i 16, that is, four-point lifting is adopted.

Furthermore, in this embodiment, the reinforcing ribs 17 are arranged on the lower surface of the main rib plate i 16, the number of the reinforcing ribs 17 corresponds to the number of the first hoisting lugs 621, and the positions of the first hoisting lugs 621 correspond to the positions of the reinforcing ribs 17, so that the stability during hoisting is ensured.

Similarly, with reference to fig. 1, 3, 5 and 6, the lower column ii 20 of the present embodiment includes a main web ii 21, a web ii 22 and a flange plate ii 23, wherein two ends of the main web ii 21 are respectively provided with a web ii 22, and the main web ii 21 and the two webs ii 22 form an i-shaped structure; two ends of the web II 22 are respectively provided with a flange plate II 23, and the web II 22 and the flange plates II 23 arranged at the two ends of the web II 22 form an I-shaped structure.

Two side surfaces of the middle part of the main web II 21 are respectively fixedly provided with a T-shaped plate II 24, one vertical end of the T-shaped plate II 24 is connected with the side surface of the main web II 21, and the height of the T-shaped plate II 24 is the same as that of the main web II 21; a plurality of main rib plates II 26 are welded in an area surrounded by the T-shaped plate II 24, the main web plate II 21, the web plate II 22 and the flange plate II 23, and the plurality of main rib plates II 26 are arranged at equal intervals along the length direction of the lower column II 20; a side rib plate II 25 is welded between two flange plates II 23 on the same web plate II 22, the side rib plate II 25 is provided with a plurality of side rib plates II 25, the plurality of side rib plates II 25 are arranged along the length direction of the lower column II 20 at equal intervals, and the side rib plate II 25 is located at one end far away from the T-shaped plate II 24.

A plurality of pairs of unloading lugs 61 are symmetrically arranged on one side of the main web II 21, the unloading lugs 61 are arranged at equal intervals along the length direction of the lower column II 20, and the mounting position of the unloading lugs 61 on the lower column II 20 is the same as that of the lower column I10. In addition, 2 hoisting lug II 622 are installed at the top interface of the lower column II 20, and the 2 hoisting lug II 622 are arranged on two sides of the lower column II 20 in a staggered mode, and refer to fig. 5 and 6.

The upper column III 30 of this embodiment is arranged at the upper end of the lower column II 20, the upper end face of the lower column II 20 is provided with an upper top plate II 28, and the travelling crane can be installed on the upper top plate II 28 subsequently, so that the bottom face of the upper top plate II 28 is fixedly provided with a plurality of stiffened plates 27, the bearing capacity of the upper top plate II 28 is improved, and the problem of deformation during installation is avoided.

With reference to fig. 1, 5, 6 and 7, the upper column iii 30 of the present embodiment includes a web iii 31 and a flange plate iii 32, two ends of the web iii 31 are respectively provided with a flange plate iii 32, and the web iii 31 and the two flange plates iii 32 form an i-shaped structure; the flange plate III 32 corresponds to the web plate II 22 of the lower column II 20 in position, a plurality of main rib plates III 33 are welded in the area surrounded by the web plate III 31 and the flange plate III 32, and the plurality of main rib plates III 33 are arranged at equal intervals along the length direction of the upper column III 30.

It is worth noting that, in conjunction with fig. 1, the height of the web II 22 and the flange II 23 at one end of the lower column II 20 is higher than that of the web II and the flange II at the other end, namely higher than that of the upper top plate II 28, and the height is 1/5-1/4 of the upper column III 30, preferably 1/5 higher than that of the upper column III 30 in the embodiment. Through this structural design, guarantee that III 30 of upper prop can not take place to empty the problem in the installation, also play the positioning action of butt joint in-process simultaneously to improve the installation accuracy.

With reference to fig. 1, 7, 8 and 9, an upper column iv 40 of the present embodiment is disposed on an upper top plate iii 34 of an upper column iii 30, the upper column iv 40 includes a web iv 41 and a flange plate iv 42, two ends of the web iv 41 are respectively provided with a flange plate iv 42, and the web iv 41 and the two flange plates iv 42 form an i-shaped structure.

It should be noted that, as shown in fig. 7, one of the flange plates iv 42 of the upper column iv 40 corresponds to one of the flange plates iii 32 of the upper column iii 30 in this embodiment, as can be seen from fig. 1, the flange plates iii 32 corresponding to the upper column iv 40 and the upper column iii 30 and the flange plates iii 32 corresponding to the web plates ii 22 of the lower column ii 20 are different flange plates iii 32, so as to form a staggered installation, and improve the bearing capacity of the whole steel column.

In the embodiment, a plurality of unloading lugs 61 are arranged at corresponding positions on the upper column iii 30 and the upper column iv 40, and the unloading lugs 61 are arranged at equal intervals along the length direction of the corresponding columns. Meanwhile, the top end of the corresponding column body is symmetrically provided with three lifting lugs 623, so that the column body can be conveniently lifted, and the specific positions refer to fig. 7, 8 and 9.

In order to facilitate the subsequent installation or use process, personnel can climb on the steel columns, and temporary ladder stands 80 are arranged along the length directions of the lower columns I10, the lower columns II 20, the upper columns III 30 and the upper columns IV 40.

The installation method of the large-scale steel-making high-span solid-web steel column in the embodiment comprises the following steps:

step one, manufacturing in sections

Because the height of the steel column is high, the weight is heavy, according to the relevant size and weight of a steel column drawing and the rated lifting capacity of a crane, the lower column double-limb solid abdominal type unit and the upper column single-limb solid abdominal type unit are manufactured in two sections, namely a lower column I10, a lower column II 20, an upper column III 30 and an upper column IV 40, and a temporary ladder 80, an unloading lifting lug 61, a corresponding lifting lug, a butt joint positioning plate and the like arranged on each section of column body are processed and finished in a manufacturing plant.

The temporary ladder stand 80 adopts

The round steel is cold-bent into a U shape, the two ends of the U shape are horizontally reserved with the length of 35mm, and the U-shaped horizontal section of the reinforcing steel bar is firmly welded from bottom to top along one side of the column body; the top of the ladder is provided with a safety catch as an up-down ladder for operators.

The unloading lifting lugs 61 and the corresponding hoisting lifting lugs are characterized in that each section of the column body is provided with lifting lugs for unloading and hoisting in different shapes and quantities according to the segmentation, the structural style, the weight and the gravity center position of the steel column, the lifting lugs are made of steel plates with the thickness of 60-36 mm, the sharp corners are in arc transition, and the hole diameter is matched with the shackle diameter.

And the interface positioning plates are respectively arranged on the flange plates of the corresponding columns, and the steel plates with the specification of 300mm by 150mm by 20mm are manufactured and welded.

Step two, construction preparation

a. And (5) retesting the centers and the elevations of the foundation I10 of the lower column and the foundation bolt. Respectively placing the center lines of the columns at the position +1.2 of the column body of the lower column I10 and at the position 0.300 below the bracket, wherein the centers are marked as two red triangles which are arranged up and down;

b. roughening a foundation 50, arranging a backing plate 51 by adopting a mortar setting method, arranging a group between two foundation bolts, and arranging a group outside a column base;

c. rechecking the center and the related size of the lower column I10, and making a related mark;

d. a temporary work platform 70 is prepared at the interface between the columns.

Step three, hoisting of lower column double-limb solid-web type unit

【1】 Lower column I10 hoisting

a. Lower column I10 adopts four-point hoist and mount, and a hoist and mount lug 621 sets up on the top of lower column I10, and this hoist and mount lug 621 adopts 60 mm's steel sheet preparation, and the hoist adopts the shoulder pole balanced type. The shoulder pole type balanced lifting appliance is characterized in that a steel plate with the thickness of 50mm is processed into a trapezoid to serve as a lifting plate, two lifting holes are formed in the upper end of the lifting plate to serve as lifting holes of a crane and are matched with a lifting hook of the crane, two round holes are symmetrically formed in the lower section of the lifting plate to serve as shackle holes for lifting a steel column, the diameter of each round hole is larger than that of a shackle, the inner sides of three holes formed in the lifting plate are required to be ground into round corners for transition, and the outer sides of the three holes are symmetrically welded and reinforced by the steel plate with the thickness of 20 mm;

b. during hoisting, when the upper end of the lower column I10 is hoisted to a height of 1m away from the ground, the operation platform 70 and the railing at the top-to-top joint of the lower column I10 are installed; after the installation is finished, slowly hoisting;

c. after the lower column I10 is hoisted in place, the center of the lower column I10 and the center of the foundation 50 must be accurately centered, and the verticality is controlled within 20 mm.

Lower I10 verticality alignment: when the column body is hoisted in place, the boom of the crane rotates to perform alignment, two theodolites are adopted to align the verticality of the column body from two mutually perpendicular directions, and then another theodolite is erected to monitor so as to prevent the column body from twisting. The method comprises the following steps that a level gauge is adopted to align the bottom elevation of a lower column I10, and the elevation alignment is carried out by using a Q50t screw jack and a base plate 51 arranged below a column base; after the verticality and the elevation are found right, the hook can be loosened after the foundation bolt is fastened, the foundation bolt is screwed, the vertical deviation is rechecked, and the foundation bolt can be completely rechecked after secondary grouting.

d. After the lower column I10 is aligned, fastening a foundation nut, and firmly spot-welding sizing blocks; grouting the column base temporarily; grouting is carried out after the lower column I10 and the lower platform structure form a stable space structure system, and the perpendicularity of the steel column is retested before grouting;

【2】 Hoisting lower column II 20

a. Two-point hoisting is adopted on the top end of the lower column II 20, two hoisting lugs 622 are arranged on the top end of the lower column II 20, the two sides of the column are arranged in a staggered mode, the two hoisting lugs 622 are made of steel plates of 60mm, and during hoisting, the steel wires and shackles are directly used for hoisting.

b. During hoisting, when the upper end of the lower column II 20 is hoisted to a height of 1m away from the ground, the operation platform 70 and the railing at the joint are installed; after the installation is finished, slowly hoisting;

c. and (3) aligning the verticality of the lower column II 20: when the lower column II 20 is hoisted in place, the crane boom of the crane is also adopted to rotate for alignment, two theodolites are adopted to align the verticality of the steel column from two mutually perpendicular directions, and then another theodolite is erected for monitoring to prevent the column body from twisting.

d. Lower column II 20 butt joint

1) Setting an arc striking plate and preheating before welding: before welding, arc striking plates are arranged on two sides of a flange plate between the columns, a welded joint is subjected to rust removal and dirt cleaning, and a base metal is preheated by oxyacetylene flame at the preheating temperature of 100-150 ℃;

2) a welding step: and (3) welding a butt joint gap by adopting a steel plate with the thickness of 8mm, firstly welding the corresponding flange plate and web plate, secondly welding the main web plate, then welding the T-shaped plate on the main web plate, and finally welding a longitudinal vertical welding line after the butt joint welding line is welded.

3) The welding process sequence is as follows: firstly, eight welders symmetrically weld a flange plate and a web plate at the same time; after welding, four welders symmetrically weld the main web plates at the same time; the other four welders symmetrically weld the T-shaped plates on the main web plate at the same time; all welding seams are symmetrically welded after back gouging and polishing. In the whole process, the transverse butt welding seam is completely finished; and then completing the longitudinal butt welding seam.

4) Heat preservation after welding: and immediately preserving the heat of the welding seam by using a rock wool plate after welding, slowly cooling the welding seam, and carrying out ultrasonic flaw detection on the welding seam after welding for 12-48 hours.

Step four, hoisting the upper column single-limb solid-web type unit

【1】 Upper column III 30 hoisting

a. Before the upper column III 30 is hoisted, the inter-column support, the frame beam and the platform main beam between the lower column I10 and the lower column II 20 are all installed, so that a stable frame structure system is formed and can be hoisted.

b. The upper column III 30 is hoisted by two points, a third hoisting lug 623 is arranged at the top end of the upper column III 30, and the third hoisting lug 623 is made of a 40mm steel plate; during hoisting, the steel wire rope and the shackle are directly used for hoisting.

c. During hoisting, when the upper end of the upper column III 30 is hoisted to a height of 1m away from the ground, the operation platform 70 and the railing at the joint are installed; after the installation is finished, slowly hoisting;

d. and (3) aligning the verticality of the upper column III 30: two theodolites are adopted to align the verticality of the steel column from two mutually perpendicular directions.

e. Upper column III 30 butt joint

1, setting an arc striking plate and preheating before welding: before welding, arranging arc striking plates on two sides of a flange plate between the columns, removing rust and dirt of a welded joint, and preheating a base metal by using oxyacetylene flame, wherein the preheating temperature is 100-150 ℃;

2, welding: the butt joint gap of the welding seam adopts a steel plate with the thickness of 4mm, two welders symmetrically weld the flange plates at the same time, and the back sides of the flange plates are subjected to gouging, back chipping and polishing and then welding; and simultaneously symmetrically welding webs, and welding after back gouging and polishing. In the whole process, the transverse butt welding seam is completely finished; and then completing the longitudinal butt welding seam.

4, heat preservation after welding: and immediately preserving the heat of the welding seam by using a rock wool plate after welding, slowly cooling the welding seam, and carrying out ultrasonic flaw detection on the welding seam after welding for 12-48 hours.

【2】 Hoisting upper column IV 40

a. Before the upper column IV 40 is hoisted, in order to ensure the stability of the lower column body, the inter-column support, the frame beam and the platform main beam which are connected with the upper column III 30 are all installed and can be hoisted;

b. the upper column IV 40 is hoisted by two points, a third hoisting lug 623 is arranged at the top end of the upper column IV 40, the third hoisting lug 623 is made of a 36mm steel plate, and the hoisting is directly carried out by using a steel wire rope and a shackle during hoisting.

c. And (3) aligning the verticality of the upper column IV 40: two theodolites are adopted to align the verticality of the steel column from two mutually perpendicular directions.

d. Upper column IV 40 butt joint

1) Setting an arc striking plate and preheating before welding: before welding, arranging arc striking plates on two sides of a flange plate between the columns, removing rust and dirt of a welded joint, and preheating a base metal by using oxyacetylene flame, wherein the preheating temperature is 100-150 ℃;

2) a welding step: the butt joint gap of the welding seam adopts a steel plate with the thickness of 4mm, two welders symmetrically weld the flange plates at the same time, and the back sides of the flange plates are subjected to gouging, back chipping and polishing and then welding; and simultaneously symmetrically welding webs, and welding after back gouging and polishing. In the whole process, the transverse butt welding seam is completely finished; and then completing the longitudinal butt welding seam.

The installation method of the large-scale steel-making high-span solid web type steel column is safe and reliable, installation efficiency and installation accuracy of the steel column are effectively improved, installation and welding processes are guaranteed to be conducted in a crossed mode, the installation operation surface is enlarged, the construction period is shortened, and cost is reduced.

The present invention and its embodiments have been described above schematically, without limitation, and what is shown in the drawings is only one of the embodiments of the present invention, and the actual structure is not limited thereto. Therefore, if the person skilled in the art receives the teaching, without departing from the spirit of the invention, the person skilled in the art shall not inventively design the similar structural modes and embodiments to the technical solution, but shall fall within the scope of the invention.

Claims

1. The utility model provides a large-scale steelmaking high solid web formula steel column of striding which characterized in that: the lower column double-limb solid abdominal type unit is divided into a lower column I (10) and a lower column II (20); the upper column single-limb solid abdominal type unit is divided into an upper column III (30) and an upper column IV (40), the height of the lower column I (10) is 1.25-1.35 times that of the lower column II (20), the lengths of the lower column I (10) and the lower column II (20) are equal, the length of the upper column III (30) is 1/2 of the length of the lower column II (20), and the length of the upper column IV (40) is 1/2 of the length of the upper column III (30).

2. The large steelmaking high-span solid web type steel column as claimed in claim 1, wherein: the upper column III (30) is arranged on one side of the lower column II (20), and the upper column IV (40) is arranged on the other side of the upper column III (30).

3. The large steelmaking high-span solid web type steel column as claimed in claim 2, wherein: the lower column I (10) comprises a main web plate I (11), web plates I (12) and flange plates I (13), wherein the two ends of the main web plate I (11) are respectively provided with one web plate I (12), and the main web plate I (11) and the two web plates I (12) form an I-shaped structure; a flange plate I (13) is respectively installed at the both ends of web I (12), I shape structure is constituteed with flange plate I (13) of installing at this web I (12) both ends in web I (12).

4. The large steelmaking high-span solid web type steel column as claimed in claim 3, wherein: two side surfaces of the middle part of the main web plate I (11) are respectively and fixedly provided with a T-shaped plate I (14), one vertical end of the T-shaped plate I (14) is connected with the side surface of the main web plate I (11), and the height of the T-shaped plate I (14) is the same as that of the main web plate I (11); a plurality of main rib plates I (16) are welded in an area defined by the T-shaped plate I (14), the main web plate I (11), the web plate I (12) and the flange plate I (13), and the plurality of main rib plates I (16) are arranged at equal intervals along the length direction of the lower column I (10); be located the welding between two flange boards I (13) on same web I (12) and have a side floor I (15), side floor I (15) are equipped with a plurality ofly, and a plurality of side floors I (15) set up along the length direction of lower post I (10) equidistant, side floor I (15) are located the one end of keeping away from T template I (14).

5. The large steelmaking high-span solid web type steel column as claimed in claim 4, wherein: the lower column II (20) comprises a main web II (21), a web II (22) and a flange plate II (23), two webs II (22) are respectively arranged at two ends of the main web II (21), and the main web II (21) and the two webs II (22) form an I-shaped structure; and two ends of the web II (22) are respectively provided with a flange plate II (23), and the web II (22) and the flange plates II (23) arranged at the two ends of the web II (22) form an I-shaped structure.

6. The large steelmaking high-span solid web type steel column as claimed in claim 5, wherein: two side surfaces of the middle part of the main web II (21) are respectively fixedly provided with a T-shaped plate II (24), one vertical end of the T-shaped plate II (24) is connected with the side surface of the main web II (21), and the height of the T-shaped plate II (24) is the same as that of the main web II (21); a plurality of main rib plates II (26) are welded in an area surrounded by the T-shaped plate II (24), the main web plate II (21), the web plate II (22) and the flange plate II (23), and the main rib plates II (26) are arranged at equal intervals along the length direction of the lower column II (20); be located welding between two flange boards II (23) on same piece web II (22) and have a side floor II (25), side floor II (25) are equipped with a plurality ofly, and a plurality of side floor II (25) set up along the length direction of lower post II (20) equidistant, side floor II (25) are located the one end of keeping away from T template II (24).

7. The large steelmaking high-span solid web type steel column as claimed in claim 6, wherein: the upper column III (30) is arranged at the upper end of the lower column II (20), the upper column III (30) comprises a web plate III (31) and flange plates III (32), two ends of the web plate III (31) are respectively provided with one flange plate III (32), and the web plate III (31) and the two flange plates III (32) form an I-shaped structure; one of the flange plates III (32) corresponds to a web plate II (22) of the lower column II (20), a plurality of main rib plates III (33) are welded in an area surrounded by the web plate III (31) and the flange plates III (32), and the plurality of main rib plates III (33) are arranged at equal intervals along the length direction of the upper column III (30).

8. The large steelmaking high-span solid web type steel column as claimed in claim 7, wherein: the height of the web II (22) and the flange plate II (23) at one end of the lower column II (20) is higher than that of the upper top plate II (28), and the height of the web II and the flange plate II is 1/5-1/4, and the height of the web II and the flange plate II is higher than that of the upper column III (30).

9. The large steelmaking high-span solid web type steel column as claimed in claim 8, wherein: the upper column IV (40) is arranged at the upper end of the upper column III (30), the upper column IV (40) comprises a web plate IV (41) and flange plates IV (42), two ends of the web plate IV (41) are respectively provided with one flange plate IV (42), and the web plate IV (41) and the two flange plates IV (42) form an I-shaped structure.

10. The large steelmaking high-span solid web type steel column as claimed in claim 9, wherein the installation method comprises the following steps: step a, retesting a foundation (50), and arranging a base plate (51) at a corresponding position;

b, after the foundation (50) of the lower column I (10) is aligned to be qualified, fastening foundation bolts;

c, mounting a lower column II (20) at the upper end of the lower column I (10);

d, mounting the inter-column supports, the frame beams and the platform beams among the columns of the lower-column double-limb solid-web type unit to form a stable space structure system; grouting between the lower column I (10) and the foundation (50);

step e, an upper column III (30) is arranged at the upper end of the lower column II (20);

f, mounting the frame beam and the platform beam connected with the upper column III (30) to form a stable space structure system;

and g, mounting an upper column IV (40) at the upper end of the upper column III (30).