A method for walking and lifting of a large crawler crane with super lifting and load carrying in a coke oven reconstruction project

Abstract

A large crawler crane super lifting belt load walking lifting method for coke oven reconstruction engineering, characterized in that it comprises the following steps: a, according to the distance between the sliding line and the coke oven, the lifting weight, the lifting radius, the lifting height, the size of the single column main truss member, the center of gravity of the member, the crawler crane is selected, b, the main steel truss of the greenhouse is assembled between the sliding line outside and the corridor, c, the crawler crane walking area foundation treatment, d, the crawler crane is opened to the station point, e, the main truss is lifted and moved eastward for a certain distance, f, the end platform crawler crane, the intermediate platform crawler crane lifts and lifts the main truss walking, g, the two crawler cranes are adjusted, h, the end platform crawler crane reaches the position of increasing the super lifting counterweight, i, two auxiliary cranes are used to increase the end platform crawler crane super lifting counterweight, j, the intermediate platform 800t crawler crane adopts 18m lifting radius. The present application has the advantages of main truss assembly, which does not affect the production of coke oven, and meets the requirements of coke oven maintenance site and time.

Description

Technical Field

[0001] The invention belongs to the technical field of crawler crane double-machine lifting, and specifically relates to a super-lifting and load-carrying lifting method of a large crawler crane in a coke oven reconstruction project. Background Art

[0002] With increasing environmental regulations, installing roofs atop coke ovens has become a new trend in flue gas treatment. The first environmentally friendly coke oven retrofit project in China involved installing an inverted trough-shaped roof atop the existing coke oven. The main truss of the roof is divided into two sections: one on the machine side and one on the coke oven side, spanning the portal frames of the coke oven's end and middle platforms. Each main steel truss is heavy (over 320 tons) and has a large span (over 110 meters). The coke pusher skid cannot be removed to meet production needs to prevent damage to the coke oven due to dry burning. The coke oven's machine side is narrow (31.2 meters clear between the outer side of the skid and the mountain, 22.1 meters clear between the inner side and the coke oven). The coke oven side is cluttered with unusable equipment, creating a major challenge for the project. Therefore, it was essential to find an efficient method for large crawler cranes to operate the system. Summary of the Invention

[0003] The purpose of the present invention is to provide a safe and reliable method for lifting a large crawler crane with load during traveling in a coke oven reconstruction project.

[0004] To achieve the above objectives, the technical solution of the present invention is:

[0005] A large crawler crane super-lifting and carrying lifting method for a coke oven renovation project is used to lift and install the main steel truss of the ramming coke oven roof shed. A single main truss weighs 320t, has a span of 116m, a height of 6m, and a width of 5.4m. The method is characterized by comprising the following steps:

[0006] a. Select crawler crane based on the distance between the sliding line and the coke oven, lifting capacity, lifting radius, lifting height, size of single main truss member, and center of gravity of the member. The crawler crane for the intermediate platform is installed and removed on the inner side of the sliding line of the end platform, while the crawler crane for the end platform is installed and removed on the outer side of the sliding line of the end platform;

[0007] b. The main steel trusses of the greenhouse are assembled in sections between the outside of the slide line and the corridor. The net distance between the outside of the slide line and the dust removal ground station is 7.5m;

[0008] c. In the crawler crane travel area, the original foundation is cored and sampled, preloaded and tested, and the foundation is treated with reinforced concrete, retaining walls, backfill soil, and roadbed boxes;

[0009] d. The crawler crane is opened to the station position. The end platform crawler crane is positioned outside the end platform sliding line, and the intermediate platform crawler crane is positioned between the coke oven and the sliding line;

[0010] e. lifting the main truss eastward for a certain distance, aligning the center of the main truss with the center of the pusher car and the dedusting ground station, and avoiding the dedusting ground station, at this time, the end track carrier crane is in the non-overhead working condition, and the end track carrier crane is in the overhead working condition;

[0011] f. the end track carrier crane and the intermediate track carrier crane lift the main truss to walk 63.1 m;

[0012] g. the two track carrier cranes adjust the rotating arm, and the main truss is wound from the outside of the pusher car slide to the inside of the slide;

[0013] h. keeping the main truss stationary, the end track carrier crane walks 15.8 m with load, so that the end track carrier crane reaches the position of increasing the overhead weight

[0014] i. two auxiliary cranes are used to increase the overhead weight of the end track carrier crane;

[0015] j. the intermediate 800 t track carrier crane adopts a 18 m lifting radius, the end track carrier crane adopts a 37 m lifting radius, and the double-machine lifting is in place, from the power-off of the pusher car slide of the coke oven shutdown to the recovery of production, a total of 7 hours, during the walking with load and the increasing of the overhead weight, the bottom of the main truss is always kept 0.5 m high from the ground, which is safe and reliable.

[0016] The coke oven reconstruction project large track carrier crane overhead walking lifting method of the present application can also be further realized by using the following technical measures.

[0017] The foregoing method, wherein the main steel truss of the greenhouse is divided into 8 segments for assembly.

[0018] The foregoing method, wherein the eastward translation distance is 1.2 m.

[0019] The foregoing method, wherein the lifting radius of the end track carrier crane is ≥20 m, and the arm length is ≥78 m.

[0020] The foregoing method, wherein in step e, the end track carrier crane is overhead with 0 weight.

[0021] The foregoing method, wherein the rated lifting capacity of the auxiliary crane is ≥25 t.

[0022] The foregoing method, wherein in step f, the main arm elevation angle of the walking track carrier crane is kept between 75° and 77°.

[0023] The foregoing method, wherein in step j, the overhead weight is added to 250 t.

[0024] The foregoing method, wherein it further comprises the track carrier crane hook station selection, first ensuring that the main truss is wound between the two track carrier cranes, and does not collide with the track carrier crane main arm and the inside coke oven of the track carrier crane.

[0025] The aforementioned method, wherein the crawler crane does not touch the slide wire, coke oven, coal tower counter-hanger during the slewing process.

[0026] The aforementioned method, wherein the pusher does not collide with the pusher rod during the production operation process of the pusher.

[0027] The aforementioned method, wherein the operation time of the crawler crane from the opening to the starting station to the withdrawal of the crawler crane is ≤7h.

[0028] After the above technical solution is adopted, the coke oven reconstruction project large crawler crane super-lifting belt walking lifting method has the following advantages:

[0029] 1. The main truss assembly does not affect the coke oven production.

[0030] 2. The engineering quality is safe and reliable, the slide wire is not removed, the large crawler crane super-lifting condition is completed for lifting, the lifting process is 7 hours, meets the coke oven maintenance time requirement, creates economic benefits, and the safety factor is high.

[0031] 3. The large-span super-heavy steel truss lifting problem is solved under the condition of limited space (the net distance between the inner side of the slide wire and the coke oven is 22.1 meters, the net distance between the slide wire and the mountain is 31.2 meters, the net distance between the outer side of the slide wire and the dust removal ground station is 7.5 meters, the pusher slide wire, dust removal ground station, coke oven end platform corridor cannot be removed, and the coke side is full of equipment). BRIEF DESCRIPTION OF DRAWINGS

[0032] Figure 1 It is an end platform crawler crane with super-lifting and an interval platform crawler crane without super-lifting schematic diagram of the embodiment of the present application;

[0033] Figure 2 It is a main truss eastward translation schematic diagram of the embodiment of the present application;

[0034] Figure 3 It is a two crawler crane southward lifting schematic diagram of the embodiment of the present application;

[0035] Figure 4 It is a main truss lifting into the inner side of the slide wire schematic diagram of the embodiment of the present application;

[0036] Figure 5 It is a component stationary end platform crawler crane southward walking schematic diagram of the embodiment of the present application;

[0037] Figure 6 It is a 25-ton auxiliary truck crane adding super-lifting counterweight to the end platform crawler crane schematic diagram of the embodiment of the present application;

[0038] Figure 7 It is a main truss double-machine lifting in place schematic diagram of the embodiment of the present application;

[0039] Figure 8The figure is a hoisting elevation view of the coke oven greenhouse main truss of the embodiment of the present application.

[0040] In the figure: 1, the dust removal ground station area is 35 meters high, 2, the equipment small room height is 3.5 meters, 3, the mountain, 4, the interval table crawler crane, 5, the coke pushing car slide line is 6 meters high, 6, the main truss assembly area, 7, the end table crawler crane, 8, the pipe gallery is 5 meters high, 9, the tamping machine maintenance station, 10, the coal tower, 11, the No. 4 coke oven, 12, the ash bin, 13, the boiler, 14, the secondary dust removal, 15, the primary dust removal, 16, the heat pipe heat exchanger, 17, the circulating fan. DETAILED DESCRIPTION

[0041] The present application will be further described below in conjunction with the embodiments and the accompanying drawings thereof.

[0042] Embodiment 1

[0043] Please see Figures 1-6 The coke oven reconstruction project large crawler crane super lifting belt load walking lifting method of the present application comprises the following steps:

[0044] 1. The coke oven top large-span super heavy steel truss of the coke oven environmental protection reconstruction project is lifted by two 800-ton large crawler cranes, the end table crawler crane is configured with a 250-ton super lifting counterweight in the super lifting working condition, the super lifting radius is 20 m, and the arm length is 78 m; the interval table crawler crane is in the non-super lifting working condition, the arm length is 54 m, and the crawler crane is selected according to the distance between the slide line and the coke oven, the lifting weight, the lifting radius, the lifting height, the component size, and the component gravity center; the interval table crawler crane is installed and removed on the inner side of the end table slide line, and the end table crawler crane is installed and removed on the outer side of the end table slide line.

[0045] 2. The main truss is assembled in eight sections between the slide line outer side and the corridor (the weight of a single truss of the main truss is 320 t, the span is 116 m, the height is 6 m, and the width is 5.4 m), and the net distance between the slide line outer side and the dust removal ground station is 7.5 m.

[0046] 3. The crawler crane walking area is subjected to core sampling, pretest, and foundation treatment by using reinforced concrete, retaining wall, backfilling soil, and roadbed box.

[0047] 4. The crawler crane is opened to the station point, the end table crawler crane is positioned on the outer side of the end table slide line, and the interval table crawler crane is positioned on the inner side of the coke oven and the slide line.

[0048] 5. The main truss is lifted and translated eastward by 1.2 m, so that the center of the main truss is aligned with the center of the coke pushing car and the dust removal ground station clearance, and the dust removal ground station is avoided; at this time, the end table crawler crane is in the non-super lifting working condition, and the end table crawler crane is in the super lifting working condition (0 super lifting counterweight).

[0049] 6. The end table crawler crane and the interval table crawler crane lift and walk the main truss by 63.1 m, and the main arm angle of the belt load walking crawler crane is kept between 75° and 77°.

[0050] 7. Adjust the two crawler cranes, and make the main truss pass from the outside of the pusher car slide wire to the inside of the slide wire.

[0051] 8. Keep the main truss stationary, and make the end crawler crane walk 15.8 m with load, so that the end crawler crane reaches the position of increasing the hoisting weight.

[0052] 9. Use two 25-ton auxiliary cranes to increase the hoisting weight (the hoisting weight is increased to 250 t) of the 800-ton crawler crane of the end.

[0053] 10. The 800-ton crawler crane of the middle uses a 18-meter hoisting radius, the end crawler crane uses a 37-meter hoisting radius, and the double-machine lifting is in place. From the power-off of the pusher car slide wire of the coke oven shutdown to the resumption of production, the total time is 7 h. When walking with load and increasing the hoisting weight, the bottom of the main truss is always kept 0.5 m high from the ground, which is safe and reliable. Figure 7 The figure is a schematic diagram of the lifting of the main truss of the coke oven greenhouse of the embodiment of the present application.

[0054] The lifting method of the large crawler crane of the coke oven reconstruction project of the present application pays attention to the following points in actual operation:

[0055] First, the hook lifting station of the crawler crane is selected. Firstly, the main truss is ensured to pass between the two crawler cranes, and does not collide with the main arm of the crawler crane and the coke oven inside the crawler crane. Therefore, the distance between the two crawler cranes needs to be 121.6 m. The crawler crane does not touch the slide wire, the coke oven, and the coal tower counter hanger during the turning arm process. The main truss assembly position is selected to ensure that the pusher rod does not collide during the production and operation of the pusher car. The end crawler crane selects the hoisting condition, etc., which solves the problem of small hook lifting site, large span, and overloading component hook lifting.

[0056] Secondly, the end crawler crane hoisting condition will collide with the slide wire when the main arm turns to a certain angle. The hoisting weight needs to be removed to ensure that the end crawler crane walks 30.8 m in the direction of the middle without touching the slide wire.

[0057] Thirdly, the main truss is placed on the temporary support, and is walked to the non-hoisting condition station of the end crawler crane, which is safe and reliable.

[0058] The lifting method of the large crawler crane of the coke oven reconstruction project of the present application solves the problems of space limitation, time limitation, lifting time not exceeding 7 h, large-span overloading steel truss lifting, safety and reliability, and creates economic value in the reconstruction project without affecting the production of the coke oven.

[0059] Table 1 is a time record table of the lifting method of the hoisting weight adjustment of the large crawler crane

[0060] Serial number Name Operating time Actual start Actual completion 1 Crawler crane opened to starting station site 17 minutes 8:00 8:17 2 Binding of steel wire rope to test crane 28 minutes 8:17 8:45 3 Test crane 2 minutes 8:45 8:47 4 Double-machine lifting to the direction of the platform with a load of 63.1 m 50 minutes 8:47 9:37 5 Steel truss turned from the outside of the slide wire to the inside of the slide wire 25 minutes 9:37 10:02 6 Platform crawler crane and steel truss are stationary, end platform crawler crane walks to the platform direction with a load of 15.8 meters 22 minutes 10:02 10:24 7 End platform crawler crane increases 250 tons of super-lifting counterweight 66 minutes 10:24 11:30 8 Hooking in place 170 minutes 11:30 14:20 9 Taking steel wire rope 20 minutes 14:20 14:40 10 Crawler crane withdrawal 20 minutes 14:40 15:00 11 Total 420 minutes (7 hours)

[0061] The coke oven reconstruction engineering large crawler crane super-lifting belt load walking lifting method has substantial characteristics and significant technical progress, and the coke oven reconstruction engineering large crawler crane super-lifting belt load walking lifting method is popularized and applied through the coke oven top large-span super-heavy steel truss, the large crawler crane double-machine lifting, the super-lifting counterweight adjustment installation mode, the coke oven non-stop production, and the specific production environment large-span, super-heavy steel truss installation technology.

[0062] The above examples are only for illustrating the present application, and are not limited to the present application. Those skilled in the art can make various transformations or changes without departing from the spirit and scope of the present application. Therefore, all equivalent technical solutions should belong to the scope of the present application, and should be limited by the claims.

Claims

1. A large crawler crane super-lifting and carrying lifting method for coke oven renovation project, lifting and installing the main steel truss of the ramming coke oven roof shed. The weight of a single main truss is 320t, the span is 116m, the height is 6m, and the width is 5.4m. It is characterized by The following steps are involved: a. Select crawler crane based on the distance between the sliding line and the coke oven, lifting capacity, lifting radius, lifting height, size of single main truss member, and center of gravity of the member. The crawler crane for the intermediate platform is installed and removed on the inner side of the sliding line of the end platform, while the crawler crane for the end platform is installed and removed on the outer side of the sliding line of the end platform; b. The main steel trusses of the greenhouse are assembled in sections between the outside of the slide line and the corridor. The net distance between the outside of the slide line and the dust removal ground station is 7.5m; c. In the crawler crane walking area, the original foundation is cored and sampled, preloaded and tested, and the foundation is treated with reinforced concrete, retaining walls, backfill soil, and roadbed boxes; d. The crawler crane is opened to the station position. The end platform crawler crane is positioned outside the end platform sliding line, and the intermediate platform crawler crane is positioned between the coke oven and the sliding line; e. Lift the main truss and move it eastward for a certain distance so that the center of the main truss is aligned with the center of the clearance between the coke pushing car and the dust removal ground station, avoiding the dust removal ground station. At this time, the crawler crane at the time platform is not in super-lifting condition, while the crawler crane at the end platform is in super-lifting condition. f. The crawler crane at the end platform and the crawler crane at the intermediate platform lift the main truss and travel 63.1m; g. Adjust the two crawler crane arms and move the main truss from the outside of the coke pusher sliding line to the inside of the sliding line; h. Keep the main truss stationary and move the end platform crawler crane 15.8m to make the end platform crawler crane reach the position of adding super-lift counterweight. i. Use two auxiliary cranes to increase the end platform crawler crane's super-lifting counterweight; j. The 800t crawler crane for the intermediate platform adopts an 18m lifting radius, and the crawler crane for the end platform adopts a 37m lifting radius. The cranes are lifted into place by two cranes. It takes a total of 7 hours from the shutdown of the coke oven and the power outage of the coke pusher car slide line to the resumption of production. When traveling with load and adding the super-lift counterweight, the bottom of the main truss is always kept at a height of 0.5m from the ground, which is safe and reliable.

2. The method for lifting with load and traveling by a large crawler crane in a coke oven reconstruction project according to claim 1 is characterized in that: The main steel truss of the greenhouse is divided into 8 sections for assembly.

3. The method for super-lifting and carrying load by a large crawler crane in a coke oven reconstruction project according to claim 1 is characterized in that: The eastward translation distance is 1.2 m.

4. The method for lifting a large crawler crane with load during traveling in a coke oven reconstruction project according to claim 1, characterized in that: The lifting radius of the end platform crawler crane is ≥20m and the arm length is ≥78m.

5. The method for super-lifting and carrying load by a large crawler crane in a coke oven reconstruction project according to claim 1 is characterized in that: In step e, the end platform crawler crane is lifted to zero counterweight.

6. The method for lifting with load and traveling by a large crawler crane in a coke oven reconstruction project according to claim 1 is characterized in that: The rated lifting capacity of the auxiliary crane is ≥25t.

7. The method for lifting with load and traveling by a large crawler crane in a coke oven reconstruction project according to claim 1 is characterized in that: In step f, the elevation angle of the main arm of the loaded crawler crane is maintained between 75° and 77°.

8. The method for lifting with load and traveling by a large crawler crane in a coke oven reconstruction project according to claim 1 is characterized in that: In step j, the superlift counterweight is increased to 250t.

9. The method for super-lifting and carrying load by a large crawler crane in a coke oven reconstruction project according to claim 1, characterized in that: It also includes the selection of the crawler crane hook position, first ensuring that the main truss passes between the two crawler cranes and does not collide or interfere with the crawler crane main arm or the coke oven inside the crawler crane.

10. The method for lifting with load and traveling by a large crawler crane in a coke oven reconstruction project according to claim 1, characterized in that: It also includes that the crawler crane does not touch the sliding line, coke oven, and coal tower anti-hanging frame during the arm rotation process.

11. The method for super-lifting and carrying load by a large crawler crane in a coke oven reconstruction project according to claim 1, characterized in that: It also includes that during the production and operation of the coke pushing car, the coke pushing rods do not collide.

12. The method for lifting with load and traveling by a large crawler crane in a coke oven reconstruction project according to claim 1, characterized in that: The operation time of the crawler crane from moving to the starting station to evacuating the crawler crane is ≤7h.

Images