A method for adjusting and lifting the counterweight of a large crawler crane in a coke oven renovation project.

Abstract

A method for adjusting the counterweight of a large crawler crane in a coke oven renovation project is characterized by the following steps: a) Selecting a crawler crane based on the distance between the guide rail and the coke oven, lifting capacity, lifting radius, lifting height, dimensions of a single main truss component, and the center of gravity of the component; b) Assembling the main steel truss; c) Conducting a pre-stress test in the crawler crane's travel area; d) Designing and fabricating several temporary supports; e) Preparing for dual-crane lifting with the crawler crane; f) Lifting the main steel truss to a position where the crawler crane, in non-overlift mode, meets the rated lifting capacity requirement; g) Removing the overlift counterweight of the crawler crane at the end platform using an auxiliary crane; h) The main truss is first positioned by passing around the crawler crane from the outside of the guide rail to the temporary support in front of the coke oven; i) The crawler crane at the end platform travels a certain distance unloaded towards the intermediate platform; j) The two crawler cranes, using the same lifting radius, lift the main truss into position synchronously. This invention has the advantages of assembling the main truss without affecting coke oven production and meeting the site and time requirements for coke oven maintenance.

Description

Technical Field

[0001] This invention belongs to the field of crawler crane dual-machine lifting technology. Specifically, it is a method for adjusting the counterweight of a large crawler crane in a coke oven renovation project. Background Technology

[0002] Adding a roof to the top of a coke oven has become a new trend in flue gas treatment. The first domestic coke oven environmental renovation project added an inverted trough-shaped roof canopy to the top of the existing coke oven. The main truss of the canopy is divided into two sections: one on the machine side and one on the coke side, spanning the portal frame of the coke oven end platform and the middle platform. Each main steel truss section is heavy (greater than 320 tons) and has a large span (greater than 110 meters). The coke pusher car guide rail cannot be removed to meet production needs and prevent damage from dry burning of the coke oven. The machine side area is cramped (the net distance between the outer side of the guide rail and the corridor is 13 meters, and the net distance between the inner side of the guide rail and the coke oven is 22.1 meters). The coke side is full of unusable equipment. These real-world conditions pose a major problem for construction. Therefore, finding an efficient way to overlift large crawler cranes is essential. Summary of the Invention

[0003] The purpose of this invention is to propose a safe and reliable method for adjusting the counterweight of a large crawler crane in coke oven renovation projects.

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

[0005] A method for lifting and adjusting the counterweight of a large crawler crane in a coke oven renovation project, for lifting and installing the main steel truss of the coke oven roof canopy, wherein a single main truss weighs 320t, has a span of 116m, a height of 6m, and a width of 5.4m, is characterized by the following steps:

[0006] a. Select a crawler crane based on the distance between the sliding line and the coke oven, lifting capacity, lifting radius, lifting height, dimensions of a single main truss component, and center of gravity of the component, and carry out installation and dismantling operations at the coke oven end platform;

[0007] b. The main steel truss of the greenhouse is assembled in sections between the outside of the sliding line and the corridor, with a net distance of 13m between the outside of the sliding line and the corridor.

[0008] c. In the crawler crane's travel area, core samples were taken from the existing foundation, a preloading test was conducted, and foundation treatment was carried out using reinforced concrete, retaining walls, backfill soil, and roadbed boxes.

[0009] d. Design and manufacture several temporary supports, with one end of the temporary supports installed between the two rails of the coke pusher and the other end installed at the top of the coke oven flue.

[0010] e. Prepare for dual-crane lifting of the crawler crane. Move the crawler crane to the station point. The end platform crawler crane and the intermediate platform crawler crane are both set between the coke oven and the coke pusher car sliding line.

[0011] f. The crawler cranes, in their dual-machine operation, lift the main steel truss to the end platform position where the crawler cranes, in non-overlift conditions, meet the rated lifting capacity requirements.

[0012] g. Use an auxiliary crane to remove the counterweight of the crawler crane at the end platform;

[0013] h. The main truss is hoisted from the outside of the sliding line, around the crawler track, and placed into position for the first time on the temporary support in front of the coke oven.

[0014] i. The crawler crane on the end platform travels a certain distance unloaded towards the intermediate platform;

[0015] j. Two crawler cranes with the same lifting radius are used to lift and position the cranes synchronously.

[0016] The method for adjusting and lifting the counterweight of a large crawler crane in coke oven renovation projects according to the present invention can also be further implemented using the following technical measures.

[0017] In the aforementioned method, the main steel truss of the greenhouse is assembled in 8 sections.

[0018] In the aforementioned method, the number of temporary supports is set to ≥10.

[0019] In the aforementioned method, the lifting radius of the end-platform crawler crane is ≥30m, the boom length is ≥78m, and the rated lifting capacity of the boom is ≥200t.

[0020] In the aforementioned method, in step f, the end platform crawler crane lifts the boom, and the intermediate platform crawler crane main boom rotates counterclockwise.

[0021] In the aforementioned method, the rated lifting capacity of the auxiliary crane is ≥80t.

[0022] In the aforementioned method, the unloaded travel distance is ≥30.8m.

[0023] In the aforementioned method, in step j, the crawler crane uses a lifting radius of 18m.

[0024] The aforementioned method also includes the selection of the crawler crane hook position, firstly ensuring that the main truss passes between the two crawler cranes and does not collide or interfere with the crawler crane main boom or the coke oven inside the crawler crane.

[0025] The aforementioned method also includes ensuring that the crawler crane does not touch the sliding line, coke oven, or coal tower anti-lifting frame during the boom rotation process.

[0026] The aforementioned method also includes ensuring that the coke pusher rod does not collide during the production operation of the coke pusher car.

[0027] In the aforementioned method, the operation time of the crawler crane from its arrival at the starting station to its departure is ≤4.8h.

[0028] The method for adjusting and lifting the counterweight of a large crawler crane in coke oven renovation projects according to the present invention can also be further implemented using the following technical measures.

[0029] The aforementioned method, wherein

[0030] After adopting the above technical solution, the method for adjusting and lifting the counterweight of a large crawler crane in coke oven renovation projects of the present invention has the following advantages:

[0031] 1. The main truss assembly will not affect coke oven production;

[0032] 2. The project is of high quality and safe and reliable. The sliding rails are not removed. The lifting is completed in the super-lift mode of the large crawler crane. The lifting process takes 4.8 hours, which meets the time requirements for coke oven maintenance, creates economic benefits, and has a high safety factor.

[0033] 3. Solve the problem of hoisting large-span, heavy-duty steel trusses under limited site conditions (net distance between the inner side of the sliding line and the coke oven is 22.1 meters, net distance between the outer side of the sliding line and the corridor is 13 meters, and the coke oven is full of equipment). Attached Figure Description

[0034] Figure 1 This is a schematic diagram of the super-lift counterweight of the end platform track sling in an embodiment of the present invention;

[0035] Figure 2 This is a schematic diagram of the lifting and dismantling of the super-lift counterweight for the end platform track in an embodiment of the present invention;

[0036] Figure 3 In this embodiment of the invention, the main truss is hoisted from the outside of the sliding line, around the crawler track, and placed into position for the first time on the temporary support in front of the coke oven.

[0037] Figure 4 This is a schematic diagram of the unloaded movement of the end platform tracked crane towards the intermediate platform according to an embodiment of the present invention;

[0038] Figure 5 This is a schematic diagram of the dual-machine lifting and positioning according to an embodiment of the present invention;

[0039] Figure 6 This is a schematic diagram of the hoisting elevation of the main truss of the coke oven shed according to an embodiment of the present invention (without superlift operation);

[0040] Figure 7 This is a schematic diagram of the hoisting elevation of the main truss of the coke oven shed according to an embodiment of the present invention (with super-lifting condition).

[0041] In the diagram: 1. Elevation of the bottom of the corridor support (18-35.2 meters); 2. Assembly position of the main truss; 3. Elevation of the coke pusher sliding line (6 meters); 4. Crawler crane at the end platform; 5. Temporary support; 6. Tamping machine maintenance station; 7. Coal tower; 8. Crawler crane at the platform; 9. No. 3 coke oven. Detailed Implementation

[0042] The present invention will be further described below with reference to the embodiments and accompanying drawings.

[0043] Example 1

[0044] Please see now Figure 1-5 The present invention provides a method for adjusting and lifting the counterweight of a large crawler crane in a coke oven renovation project, comprising the following steps:

[0045] 1. The coke oven environmental protection renovation project involves the large-span, heavy-duty steel truss at the top of the coke oven. Two 800-ton large crawler cranes are used for lifting. The crawler crane at the end platform is equipped with a 150-ton super-lift counterweight in super-lift mode, with a super-lift radius of 20 meters and a boom length of 78 meters. The crawler crane at the middle platform is equipped with a 54-meter boom in non-super-lift mode. The crawler crane is selected based on the distance between the sliding line and the coke oven, the lifting capacity, lifting radius, lifting height, component size, and component center of gravity, etc., for installation and dismantling operations at the coke oven end platform.

[0046] 2. The main truss is assembled in 8 sections between the outside of the sliding line and the corridor (each main truss weighs 320 tons, spans 116 meters, is 6 meters high, and is 5.4 meters wide), with a net distance of 13 meters between the outside of the sliding line and the corridor.

[0047] 3. In the crawler crane's travel area, core samples were taken from the existing foundation, preloading tests were conducted, and foundation treatment was carried out using reinforced concrete, retaining walls, backfill soil, and roadbed boxes.

[0048] 4. Design and manufacture 10 temporary supports, one end of which is installed between the two rails of the coke pusher car, and the other end is installed on the top of the coke oven flue.

[0049] 5. The crawler crane moves to the station position. Both the end platform crawler crane and the intermediate platform crawler crane are located between the coke oven and the coke pusher car sliding line.

[0050] 6. The crawler crane at the end platform raises its boom, and the main boom of the crawler crane at the middle platform rotates counterclockwise to lift the main truss to a position where the crawler crane at the end platform meets the rated lifting capacity under non-overlift conditions.

[0051] 7. Use an 80-ton auxiliary crane to remove the counterweight of the 800-ton crawler crane on the end platform.

[0052] 8. The main truss is hoisted from the outside of the sliding line, around the crawler, to the temporary support in front of the coke oven and placed in position for the first time.

[0053] 9. The tracked crane on the end platform travels 30.8 meters unloaded towards the middle platform.

[0054] 10. Both 800-ton crawler cranes adopted an 18-meter lifting radius and were lifted into place simultaneously. The entire process, from the shutdown of the coke oven and the power outage of the coke pusher car to the resumption of production, took a total of 4.8 hours. Figure 6 This is a schematic diagram of the hoisting elevation of the main truss of the coke oven shed according to an embodiment of the present invention (without superlift operation). Figure 7This is a schematic diagram of the hoisting elevation of the main truss of the coke oven shed according to an embodiment of the present invention (with super-lifting condition).

[0055] The following points should be noted during actual operation of the large crawler crane overlift counterweight adjustment and lifting method for coke oven renovation projects according to the present invention:

[0056] First, the selection of the crawler crane hooking position ensures that the main truss passes between the two crawler cranes without colliding or interfering with the main boom of the crawler cranes or the coke oven inside the crawler cranes. This requires a distance of 121.6 meters between the two crawler cranes, and the crawler cranes must not touch the sliding line, coke oven, or coal tower anti-lifting frame during boom rotation. The selection of the main truss assembly position ensures that the coke pushing rod does not collide during the production operation of the coke pushing car. The selection of the over-lifting condition for the end platform crawler crane, etc., solves the problems of lifting and hoisting components with limited hooking space, large span, and heavy weight.

[0057] Second, when the crawler crane at the end platform is in overlift mode, the main boom will collide with the guide line after turning a certain angle. The overlift counterweight needs to be removed to ensure that the crawler crane at the end platform travels 30.8 meters unloaded towards the platform without touching the guide line.

[0058] Third, the main truss is placed on a temporary support and moved unloaded to the end platform crawler crane's non-overlifting working position, which is safe and reliable.

[0059] The lifting and counterweight adjustment method for large crawler cranes of the present invention solves the problems of limited space and time, with a total lifting time of no more than 4.8 hours. It is safe and reliable for lifting large-span, heavy-duty steel trusses and creates economic value in the renovation project without affecting coke oven production.

[0060] Table 1 is a time record of the lifting method for adjusting the counterweight of a large crawler crane.

[0061] Serial Number name Operation time Actual start Actual completion 1 Tracked hoisted to the starting station 38 points 7:20 7:58 2 Attaching steel wire ropes to the trial lift 27 points 7:58 8:25 3 Trial lifting 25 points 8:25 8:50 4 Lifted to the transfer landing position 38 points 8:50 9:28 5 After removing the super-lift tie rod, the tracked crane on the end platform travels 30.8 meters unloaded towards the intermediate platform. 24 points 9:28 9:52 6 Hook in place 88 points 9:52 11:20 7 Take the steel wire rope 27 points 11:20 11:47 8 crawler crane removal 21 points 11:47 12:08 9 total 288 minutes (4.8 hours)

[0062] This invention has substantial features and significant technological advancements. The method for adjusting and lifting the counterweight of a large crawler crane in the coke oven renovation project is promoted and applied by using a large crawler crane with two machines to lift and adjust the counterweight on the top of the coke oven through a large-span, heavy-duty steel truss. This method enables the coke oven to operate without interruption and allows for the installation of large-span, heavy-duty steel trusses in specific production environments without interruption of production.

[0063] The above embodiments are for illustrative purposes only and are not intended to limit the invention. Those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention. Therefore, all equivalent technical solutions should also fall within the scope of this invention and are defined by the claims.

Claims

1. A method for lifting and adjusting the counterweight of a large crawler crane in a coke oven renovation project, for lifting and installing the main steel truss of the coke oven roof canopy, wherein a single main truss weighs 320t, has a span of 116m, a height of 6m, and a width of 5.4m, characterized in that... Includes the following steps: a. Select a crawler crane based on the distance between the sliding line and the coke oven, lifting capacity, lifting radius, lifting height, dimensions of a single main truss component, and center of gravity of the component, and carry out installation and dismantling operations at the coke oven end platform; b. The main steel truss of the greenhouse is assembled in sections between the outside of the sliding line and the corridor, with a net distance of 13m between the outside of the sliding line and the corridor. c. In the crawler crane's travel area, core samples were taken from the existing foundation, a preloading test was conducted, and foundation treatment was carried out using reinforced concrete, retaining walls, backfill soil, and roadbed boxes. d. Design and manufacture several temporary supports, with one end of the temporary supports installed between the two rails of the coke pusher and the other end installed at the top of the coke oven flue. e. Prepare for dual-crane lifting of the crawler crane. Move the crawler crane to the station point. The end platform crawler crane and the intermediate platform crawler crane are both set between the coke oven and the coke pusher car sliding line. f. The crawler cranes, in their dual-machine operation, lift the main steel truss of the greenhouse to the end platform. The crawler cranes, in non-overlift conditions, meet the rated lifting capacity requirements. g. Use an auxiliary crane to remove the counterweight of the crawler crane at the end platform; h. The single main truss is hoisted from the outside of the sliding line, around the crawler, to the temporary support in front of the coke oven and placed in position for the first time; i. The crawler crane on the end platform travels a certain distance unloaded towards the intermediate platform; j. Two crawler cranes with the same lifting radius are used to lift and position the cranes synchronously.

2. The method for adjusting and lifting the counterweight of a large crawler crane in a coke oven renovation project as described in claim 1, characterized in that, The main steel truss of the greenhouse is assembled in 8 sections.

3. The method for adjusting and lifting the counterweight of a large crawler crane in a coke oven renovation project as described in claim 1, characterized in that, The number of temporary supports is set to ≥10.

4. The method for adjusting and lifting the counterweight of a large crawler crane in a coke oven renovation project as described in claim 1, characterized in that, The lifting radius of the end-platform crawler crane is ≥30m, the boom length is ≥78m, and the rated lifting capacity of the boom is ≥200t.

5. The method for adjusting and lifting the counterweight of a large crawler crane in a coke oven renovation project as described in claim 1, characterized in that, In step f, the end platform track hoist raises its boom, and the intermediate platform track hoist rotates its main boom counterclockwise.

6. The method for adjusting and lifting the counterweight of a large crawler crane in a coke oven renovation project as described in claim 1, characterized in that, The rated lifting capacity of the auxiliary crane is ≥80t.

7. The method for adjusting and lifting the counterweight of a large crawler crane in a coke oven renovation project as described in claim 1, characterized in that, The unloaded travel distance is ≥30.8m.

8. The method for adjusting and lifting the counterweight of a large crawler crane in a coke oven renovation project as described in claim 1, characterized in that, In step j, the crawler crane uses a lifting radius of 18m.

9. The method for adjusting and lifting the counterweight of a large crawler crane in a coke oven renovation project as described in claim 1, characterized in that, It also includes the selection of the crawler crane hook position, firstly ensuring that the single main truss passes between the two crawler cranes, without colliding or interfering with the crawler crane main boom or the coke oven inside the crawler crane.

10. The method for adjusting and lifting the counterweight of a large crawler crane in a coke oven renovation project as described in claim 1, characterized in that, It also includes ensuring that the crawler crane does not touch the sliding line, coke oven, or coal tower anti-lifting frame during the boom rotation process.

11. The method for adjusting and lifting the counterweight of a large crawler crane in a coke oven renovation project as described in claim 1, characterized in that, It also includes ensuring that the coke pusher rod does not collide during the production and operation of the coke pusher car.

12. The method for adjusting and lifting the counterweight of a large crawler crane in a coke oven renovation project as described in claim 1, characterized in that, The operation time for the crawler crane from its starting point to its departure is ≤4.8h.

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