Hoisting construction method of steam tube rotary dryer equipment in narrow space

Abstract

The present application relates to a kind of steam pipe rotary dryer equipment hoisting construction method in narrow space, first to the foundation of construction area is handled;First crane station is placed to the one end of two equipment foundations and close to equipment foundation edge;Second crane is on standby on the other end outside equipment foundation;Transport vehicle carrying steam pipe rotary dryer equipment enters transport passage;After steam pipe rotary dryer equipment is transported to specified position, second crane is station to the back of steam pipe rotary dryer equipment;First crane and second crane are hung simultaneously and steam pipe rotary dryer equipment is partially lifted, and transport vehicle exits;After equipment is lifted to installation height, first crane and second crane are coordinated to go to car, and equipment is hoisted to installation position directly above, two cranes are respectively dropped hook, and equipment installation is carried out.The present application improves the safety and construction efficiency of equipment hoisting by reasonable planning crane station and walking route.

Description

Technical Field

[0001] This invention relates to the field of chemical equipment hoisting technology, and more specifically, to a method for hoisting a steam pipe rotary dryer in a confined space. Background Technology

[0002] Steam tube rotary dryers are crucial equipment for drying lignite and peat. With technological advancements, their size and weight are increasing, and the layout of process equipment is becoming more compact, leading to increased lifting difficulties. As a new type of high-efficiency drying equipment, the steam tube rotary dryer has a large installation angle, large dimensions, and heavy weight. Being a moving piece of equipment, it requires high installation precision, and consequently, high lifting accuracy. Due to the extremely limited space between dryers, and the presence of deep foundation pits and tall concrete frames as obstacles to lifting, the transportation and lifting of the equipment are extremely difficult. This necessitates meticulous planning before construction, including advance preparation and planning of personnel, equipment, construction period, and construction techniques. Summary of the Invention

[0003] The purpose of this invention is to provide a method for hoisting and installing a steam pipe rotary dryer in a confined space, which can reduce construction difficulty and thus improve construction efficiency.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0005] A method for hoisting and installing a steam pipe rotary dryer in a confined space, wherein each steam pipe rotary dryer is installed on its own foundation, and the space between two foundations serves as a transport channel for vehicles to enter and exit, includes the following steps:

[0006] Step 1: Treat the foundation of the construction area;

[0007] Step two: Position the first crane at one end of the two equipment foundations and close to the edge of the foundation; the second crane is ready at the other end of the equipment foundation.

[0008] Step 3: The transport vehicle carrying the steam pipe rotary dryer enters the transport channel;

[0009] Step 4: After the steam tube rotary dryer is transported to the designated location, place the second crane station directly behind the steam tube rotary dryer.

[0010] Step 5: The first and second cranes simultaneously hook up and lift the steam pipe rotary dryer equipment, and the transport vehicle leaves the site;

[0011] Step six: After the equipment is lifted to the installation height, the first and second cranes work together to lift the equipment directly above the installation position. The two cranes then lower their hooks to install the equipment.

[0012] Furthermore, in step one, for the backfill area after excavation, after excavating to a depth of 500mm, the backfill is carried out by layering and compacting lime-soil, and a static load test is conducted on the station area using a crane to lift the counterweight until the strength meets the requirements for crane travel. Then, a roadbed box is laid in the crane travel area.

[0013] Furthermore, in step one, roadbed plates are laid in the areas where the first crane and the second crane are stationed.

[0014] Furthermore, in step three, the transport vehicle carrying the steam pipe rotary dryer enters the transport channel at an angle.

[0015] Furthermore, in step five, the first crane hook is attached to the end of the steam pipe rotary dryer with a higher elevation, and the second crane hook is attached to the end of the steam pipe rotary dryer with a lower elevation.

[0016] Furthermore, in step six, when the end of the equipment with the higher installation elevation is about to be in place, the first crane stops lowering its hook, and the second crane lowers its hook separately until the end of the equipment with the lower elevation is in place, and then the first crane continues to lower its hook.

[0017] Furthermore, in cases where there are wastewater recycling ponds between equipment foundations, a roadbed is laid over the wastewater recycling ponds to cover the entire open corridor area, and transport vehicles cross the aforementioned roadbed to transport the equipment to its destination.

[0018] Furthermore, the first crane is a 300t crawler crane, and the second crane is a 400t crawler crane.

[0019] Furthermore, the transport vehicle is a hydraulic transport vehicle.

[0020] Furthermore, the equipment is secured and hoisted within the reinforcing ring near the roller table of the steam pipe rotary dryer.

[0021] The method for hoisting a steam pipe rotary dryer in a confined space, as described in this invention, improves the safety and efficiency of hoisting by rationally planning the crane's location and travel route, thus opening up a new application technology for the hoisting of steam pipe rotary dryers. Simultaneously, it reduces the frequency of crane movements and lowers the labor intensity of construction workers.

[0022] The method described in this invention is applicable to the hoisting of the following types of equipment: large equipment in a narrow space between multiple frames; large-volume equipment with multiple frames arranged side by side; and moving equipment that requires precise positioning and high installation accuracy and is installed at an angle. Attached Figure Description

[0023] Figure 1 This is a flowchart of the construction process of the present invention.

[0024] Figure 2 This is a schematic diagram of the key procedures in the hoisting process of the equipment of the present invention, wherein, Figure 2 -A represents the first step: equipment transportation; Figure 2 -B indicates the second step: equipment arrival; Figure 2 -C indicates the third step: unloading and hoisting of equipment; Figure 2 -D indicates that the device is in place.

[0025] Figure 3 This is a schematic diagram of the foundation treatment in the construction area.

[0026] In the diagram, 1-first crane, 2-second crane, 3-transport vehicle, 4-steam pipe rotary dryer equipment, 5-equipment foundation, 6-roadbed box. Detailed Implementation

[0027] A typical embodiment of the present invention provides a method for hoisting and installing a steam tube rotary dryer in a confined space. In this method, each steam tube rotary dryer 4 is installed on a foundation 5, and the space between two foundations 5 serves as a transport channel for a transport vehicle 3. The method specifically includes the following steps:

[0028] Step 1: Treat the foundation of the construction area;

[0029] Step 2: Position the first crane 1 at one end of the two equipment foundations 5 and place it close to the edge of the equipment foundation 5; the second crane 2 is ready at the other end of the equipment foundation 5.

[0030] Step 3: The transport vehicle 3 carrying the steam pipe rotary dryer equipment 4 enters the transport channel;

[0031] Step 4: After the steam pipe rotary dryer equipment 4 is transported to the designated location, the second crane 2 is positioned directly behind the steam pipe rotary dryer equipment 4.

[0032] Step 5: The first crane 1 and the second crane 2 simultaneously hook up and lift the steam pipe rotary dryer equipment 4 parts, and the transport vehicle 3 leaves the site;

[0033] Step six: After the equipment is lifted to the installation height, the first crane 1 and the second crane 2 work together to lift the equipment directly above the installation position. The two cranes then lower their hooks to install the equipment.

[0034] The technical solution claimed in this invention will be further clearly and completely described below with reference to a relatively specific embodiment.

[0035] The steam tube rotary dryer involved in this embodiment is a horizontal moving device, with four units arranged side by side in a north-south direction. The distance between the foundations of the four steam tube rotary dryers is narrow, with a maximum width of 16m between two equipment foundations 5. Moreover, there is an 8.9m×5m (width×depth) transverse wastewater recovery tank on one side of equipment foundation 5, and a tall concrete frame on the other side, which poses certain difficulties for on-site equipment transportation and hoisting. The steam tube rotary dryer has external dimensions of Φ3800×32000mm, weighs 380t, and is installed at an elevation of 5.53 / 2.95m with an installation inclination of 4:100. It is installed on rollers on-site, therefore, high hoisting accuracy is required.

[0036] The equipment hoisting process described in this embodiment is as follows: Figure 1 As shown.

[0037] First, based on the site survey, the unloading location of the equipment, the crane's position, and the travel route are determined, and the corresponding area is treated for foundation work. After the first crane 1 is ready, the equipment enters the site. The first crane 1 is positioned at one end of the two equipment foundations 5 and placed close to the edge of the equipment foundation 5; the second crane 2 is ready on the outside of the other end of the equipment foundation 5; the transport vehicle 3 carrying the steam tube rotary dryer equipment 4 enters the transport channel. After the steam tube rotary dryer equipment 4 is transported to the designated location, the second crane 2 is positioned directly behind the steam tube rotary dryer equipment 4, and the second crane is in place. Two cranes were hooked up and test-lifted. Crane 1 and Crane 2 simultaneously hooked up and lifted part 4 of the steam pipe rotary dryer to verify its safety performance. After confirmation, the transport vehicle 3 was removed from the site. After the equipment was raised to the installation height, Crane 1 and Crane 2 moved together to lift the equipment directly above the installation position. The two cranes then lowered their hooks to install the equipment. The two cranes worked together to install the two installation rollers of the equipment into fixed positions. After installation, the equipment was unhooked, and the cranes were removed from the site, completing the lifting operation.

[0038] More specifically, after conducting a site survey, a lifting plan was proposed using 300t and 400t crawler cranes. A field simulation was conducted using an unloaded transport vehicle and the cranes, and any problems were promptly corrected. Because the transport axle was too long and the site could not simultaneously meet the flatness requirements of both the crane and the transport vehicle, the maximum slope was adopted for the transport vehicle to ensure smooth lifting. Figure 2As shown, during the actual hoisting process, the 300t crane is first positioned at the north end of the equipment, close to the edge. The 400t crawler crane is positioned on the north side of the equipment foundation 5, ready for deployment. At this point, the equipment transport vehicle enters from south to north between the two foundations 5, close to the 300t crane. After the equipment is transported to the designated position, the 400t crane is positioned directly behind the equipment. Both cranes simultaneously hook up and lift the equipment 1000mm. After confirming everything is in order, the transport vehicle 3 exits the site close to the edge of the 400t crane's crawler track. The 300t and 400t cranes work together to hoist the equipment directly above the installation position. Both cranes simultaneously lower the equipment height. Then, when the 300t crane's lifting section (the side with the higher installation elevation) is almost in place, the 300t crane stops lowering its hook, and the 400t crane lowers its hook separately until the lower end of the equipment is in place. Then, the 300t crane continues lowering its hook, and the equipment installation is complete.

[0039] Crane operating condition selection

[0040] Because the steam pipe rotary dryer is horizontal and has a thin wall, it can only be hoisted by securing it within the reinforcing ring at the contact point of the rollers. This ensures that both cranes bear the same load, each supporting half of the equipment's weight. After determining the hoisting sling fixing method, the crane operating conditions can be determined based on the equipment's weight, dimensions, and installation elevation. A reverse-engineering method is used to select the crane operating conditions. First, the minimum rated load of the crane is determined according to the hoisting safety requirements. Then, the minimum boom length is selected based on the equipment dimensions and installation height. Finally, the operating conditions for the crane are determined by combining these two factors.

[0041] Since the equipment weight G is 380t, and the weight of the locking device used on the single hoisting vehicle is 1.5t, according to the "Safety Technical Regulations for the Use of Construction Machinery" JGJ 33-2012, the load rate of a single hoisting vehicle in a dual-machine lifting operation shall not exceed 75%. Therefore, the minimum rated load of the crane used can be determined.

[0042]

[0043] After determining the minimum rated load of the crane, the crane's operating conditions were roughly determined. Since the maximum installation elevation of the steam pipe rotary dryer is +5.5300m and the equipment diameter is 3.8m, the crane can operate under its minimum operating conditions. Based on the site conditions, the 300t crane uses an 18m main boom, a 5.5m working radius, and a rated lifting capacity of 286t, meeting safety requirements. Because the 400t crane is located near the sewage recycling pond, its minimum working radius, measured on-site, is 16m. Under overlift conditions, it uses a 36m heavy-duty main boom, an overlift counterweight of 200t, and an overlift radius of 13m. At this point, the 400t crane's rated load is 299t, greater than 280t, meeting the lifting safety requirements.

[0044] Crane station location and travel route planning

[0045] The transportation and hoisting sites were roughly determined by on-site measurement, and then the construction details were corrected and improved by using empty vehicle travel simulation, which ensured the safety and reliability of the construction process.

[0046] The space between the foundations of the steam tube rotary dryer is narrow, and a wastewater recycling pond acts as an obstruction. During the hoisting planning, our primary consideration was equipment transportation, making it a prerequisite for hoisting. Crane placement could only be arranged after transportation was completed. Due to the narrow distance between the foundations and the large length of the equipment, it was decided to transport the equipment at an angle next to the foundations. A paved road surface was laid over the wastewater recycling pond to cover the entire open area, and then a transport flatbed truck crossed the road surface to transport the equipment to its position. Based on the determined crane operating conditions, the 300t crane has a lifting radius of 5.5m, so it can only be lifted from the side of the equipment's lifting point. Therefore, the 300t crawler crane was first moved to the north side of foundation 5, and then the equipment was transported next to foundation 5. After the equipment was in place, a 400t crane was positioned behind the crane. To allow the transport vehicles to exit the site smoothly, the 400t crane had a radius of at least 16m. After attaching a super-lift counterweight, it lifted the equipment together with the 300t crane, and then the transport flatbed truck left the site.

[0047] Foundation treatment

[0048] After determining the equipment unloading location and the crane's travel area, calculations can be performed on the crane's grounding ratio, and the foundation can be treated according to the site conditions, such as the treatment area. Figure 3 As shown.

[0049] For the equipment unloading and crane positioning areas, based on the plant geological survey report and underground pipeline construction drawings, the lifting area, excluding the backfilled areas of the excavated foundation pits on both sides, is an undisturbed area that meets the lifting requirements. The site's bearing capacity was checked and calculated, and the shear wall strength of the sewage recycling pool was verified to ensure the distance between the crane and the shear wall is at a safe level. Based on the crane's ground pressure and the shear wall's bearing capacity, a distance of at least 2 meters is given for the crane to be positioned beyond the sewage recycling pool. Based on the calculated maximum ground contact ratio of the crane, the following foundation treatment plan was formulated: For the backfilled area after excavation, a 500mm deep excavation was carried out, followed by compacted 3:7 lime-soil layers. A static load test was conducted on the positioning area using the crane's counterweight until the strength met the crane's load-bearing requirements. Then, roadbed boxes 6 were laid in the crane's track walking area to ensure the foundation's bearing capacity meets the crane's lifting requirements.

[0050] Equipment hoisting lock installation and trial hoisting

[0051] The steam pipe rotary dryer weighs 380t. The equipment has no lifting lugs; only the thickened area near the roller table allows for securing. A pair of custom-made Ф90mm-40m steel wire ropes are used for securing and hoisting the equipment. The method of "two bends and four strands" is employed: the steel wire rope is bent twice and then folded in the middle before being hooked onto the crane hook. Both rope loops are also hooked onto the hook, thus securing the equipment. After confirming the locking devices are in place, all equipment and personnel are carefully checked to ensure they are in position. Once everything is confirmed to be in order, a trial lift begins. Before the trial lift, all crane operators, signalmen, and observers are in position. Both cranes simultaneously lift the hooks, moving the steam pipe rotary dryer 300mm away from the equipment transport saddle. The equipment is then left to stand for one hour, during which time the hydraulic pallet trolley remains stationary to ensure the safety of the equipment and cranes.

[0052] The equipment was officially hoisted and precisely installed.

[0053] During the dual-crane lifting process, the two cranes have different models, operating conditions, and working radii. The radius needs to be adjusted when they move forward together, placing high demands on the lifting operation. The steam pipe rotary dryer has a large installation inclination and high installation precision, requiring close coordination between the two cranes. A single-point positioning and multi-point fine-tuning method is used to meet the installation accuracy requirements. During the formal lifting of the equipment, once the lifting height exceeds the installation elevation by 500mm, the two cranes move together. During the movement, only one crane is allowed to perform one action at a time to avoid both cranes moving simultaneously or one crane performing both moving and boom rotation simultaneously. When the steam pipe rotary dryer is directly above the equipment foundation 5, the 400-ton crane, being close to the equipment's positioning point, lowers its hook first, while the 300-ton crane remains stationary. During the lowering and positioning of the 400-ton crane, the equipment's swaying is strictly controlled, and its position is adjusted promptly. When the equipment is about to contact the roller platform, special auxiliary equipment is used to position it correctly. Then, the 300-ton crane lowers its hook, placing the equipment completely on the roller platform, completing the equipment installation. After all checks are completed and everything is in order, the crane will be unhooked and removed from the site, thus completing the lifting task.

Claims

1. A method for hoisting a steam tube rotary dryer apparatus in a narrow space, characterized by, Four steam tube rotary dryer devices are arranged in parallel in the north-south direction, the distance between the foundations of the four steam tube rotary dryer devices is narrow, each steam tube rotary dryer device is installed on the foundation of the steam tube rotary dryer device, the space between the foundations of two steam tube rotary dryer devices is used as a transportation channel for the transportation vehicle to enter and exit, and the method comprises the following steps: Step one, processing the foundation of the construction area; Step two, placing the first crane station on the inner side of one end of the foundation of the two steam tube rotary dryer devices and close to the edge of the foundation of the steam tube rotary dryer device; the second crane is stationed on the outer side of the other end of the foundation of the steam tube rotary dryer device; Step three, the transportation vehicle carrying the steam tube rotary dryer device enters the transportation channel; Step four, after the steam tube rotary dryer device is transported to the designated position, the second crane is stationed to the rear of the steam tube rotary dryer device; Step five, the first crane and the second crane are hooked at the same time and the steam tube rotary dryer device is partially lifted, and the transportation vehicle exits; the first crane is hooked to one end of the steam tube rotary dryer device with a larger elevation, and the second crane is hooked to one end of the steam tube rotary dryer device with a smaller elevation; Step six, after the steam tube rotary dryer device is lifted to the installation height, the first crane and the second crane cooperate to walk the vehicle, the steam tube rotary dryer device is lifted to the installation position above, the two cranes are respectively unhooked, and the steam tube rotary dryer device is installed; wherein, when the end with a larger installation elevation of the steam tube rotary dryer device is in place, the first crane stops unhooking, and the second crane unhooked alone until the end with a smaller elevation of the steam tube rotary dryer device is in place, and then the first hook continues to unhook.

2. The method of claim 1, wherein: In step one, for the backfill area after excavation, the backfill is compacted by using ash soil in layers after excavating 500mm deep, and a static load test is conducted on the station area by using the crane super lifting counterweight until the strength meets the walking requirements of the crane, and then a roadbed box is laid on the walking area of the crane.

3. The method according to claim 1 or 2, characterized in that: In step one, the first crane and the second crane are laid on the roadbed plate.

4. The method of claim 3, wherein: In step three, the transportation vehicle carrying the steam tube rotary dryer device enters the transportation channel obliquely.

5. The method according to claim 1 or 4, characterized in that: For the case that there is a sewage recovery tank between the foundations of the steam tube rotary dryer devices, a roadbed plate is laid on the sewage recovery tank to cover the entire corridor area, and the transportation vehicle crosses the roadbed plate to transport the steam tube rotary dryer device to the designated position.

6. The method of claim 5, wherein: The 300t crawler crane of the first crane, and the 400t crawler crane of the second crane.

7. The method of claim 6, wherein: The transportation vehicle adopts a hydraulic transportation vehicle.

8. The method of claim 7, wherein: The steam tube rotary dryer device is bundled and lifted in the reinforcing ring close to the roller table of the steam tube rotary dryer device.

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