Dismantling method for transportation channel crossing existing pipeline group

Abstract

The invention relates to the technical field of channel dismantling, and discloses a method for dismantling a transport channel crossing an existing pipeline group, which comprises the following steps: S1, a rigid protective shed is built in an intersection area of the existing pipeline group and the transport channel, and the length and width of the rigid protective shed exceed the dismantling operation range of the transport channel; s2, a dismantling operation area and a warning area are divided, and the transportation channel is comprehensively cleaned; s3, three cranes are used for carrying out hoisting and dismantling operation in a three-crane hoisting mode, and the maximum operation distances of the three cranes are all larger than the width size of the rigid protective shed; s4, the three cranes synchronously wind the steel wire rope to a tensioning state, and the connecting structure of the conveying channel is cut and separated; s5, the transportation channel is cooperatively lifted by the three cranes, and the transportation channel is transferred and lowered to the area outside the rigid protective shed; and S6, carrying out segmented cutting, transporting away from the dismantling operation area, and cleaning the site. The three-machine lifting mode reduces the toppling or falling risk during lifting and dismantling, and the safety of dismantling construction is guaranteed.

Description

Technical Field

[0001] The invention relates to the technical field of channel removal, and in particular to a method for removing a transport channel across an existing pipeline group. Background Art

[0002] In construction projects, steel structure transport channels are temporary channels that need to be dismantled after the project is completed.

[0003] If there is no impact from existing structures during demolition, temporary support frames are usually set up to dismantle the structures in blocks, and then a single or double truck crane is used to lift the structures to the ground. However, for transportation corridors that cross existing oil pipelines, if objects fall or fall during lifting and demolition, it is easy to cause serious damage to the existing oil pipelines, making it difficult to ensure the safety of the demolition construction and prolonging the demolition period. Summary of the invention

[0004] The technical problem to be solved by the present invention is that once dumping or falling objects occur during hoisting and dismantling, serious damage is easily caused to the existing oil pipeline group, it is difficult to ensure the safety of the dismantling construction, and the dismantling period is long.

[0005] In order to solve the above technical problems, the present invention provides a technical solution for a method for dismantling a transport channel across an existing pipeline group:

[0006] The method for dismantling a transport channel across an existing pipeline group comprises the following steps:

[0007] S1. A rigid protective shed is built at the intersection of the existing pipeline group and the transport channel, and the length and width of the rigid protective shed exceed the demolition operation range of the transport channel;

[0008] S2. Divide the demolition operation area and the warning area, and conduct a comprehensive cleanup of the transportation channel;

[0009] S3. Use three cranes to carry out the lifting and dismantling operation in a three-machine lifting manner, and the maximum operating distance of the three cranes is greater than the width of the rigid protective shed;

[0010] S4, the three cranes synchronously reel in the steel wire ropes to a tensioned state, and cut and separate the connecting structure of the transport channel;

[0011] S5. Three cranes collaboratively lift the transport passage, transfer the transport passage, and lower it to an area outside the rigid protective shed;

[0012] S6. Cut into sections, transport away from the demolition area, and clean up the site.

[0013] Furthermore, in step S1, a fireproof cushion is laid on the top of the existing pipeline group, and the fireproof cushion is a fireproof ceramic fiber needle-punched blanket, and the two sides of the existing pipeline group are wrapped and fixed.

[0014] Furthermore, in step S1, the rigid protective shed includes two side structures and an upper structure, both of which use double-row Bailey frames with a spacing of 0.9 m. The double-row Bailey frames are fixed with stained glass windows, and the upper part of the rigid protective shed is also covered with a layer of color-coated steel plate.

[0015] Further, in step S3, the three cranes are respectively a first crane, a second crane and a third crane; the first crane is arranged on the unloading side of the existing pipeline group, and the first crane is hoisted and connected to one end of the transport channel;

[0016] The second crane is arranged on the unloading side of the existing pipeline group, and the second crane is hoisted and connected to the middle of the transportation channel; the third crane is arranged on the other side of the existing pipeline group, and the third crane is hoisted and connected to the other end of the transportation channel.

[0017] Furthermore, in step S3, the first crane and the second crane are distributed on both sides of the transport channel, and the second crane and the third crane are distributed on the same side of the transport channel; the maximum operating distance of the crane refers to the maximum range of motion of the crane boom in a direction parallel to the transport channel.

[0018] Furthermore, in step S3, the theoretical shared load of the three cranes is one third of the total weight of the transport channel, and the maximum lifting weights of the first crane, the second crane, and the third crane are all greater than 1.5 times the theoretical shared load of the three cranes.

[0019] Furthermore, in step S3, the first crane is a 300t truck crane, the third crane is a 350t truck crane, the first crane and the third crane are used to undertake the main lifting task; the second crane is a 350t truck crane, which is used to undertake the protection task.

[0020] Furthermore, in step S3, the lifting point of the first crane and the lifting point of the third crane are both located 1.5 m away from the end of the transport channel, and the lifting point of the second crane is located in the middle of the transport channel.

[0021] Furthermore, in step S3, the wire rope of the crane is hung by passing through the steel beam above the node of the transport channel and connected and fixed with a 35t clamp, and the steel structure beam is used to prevent the hanging point from sliding; the vertical height of the wire rope after hanging is any size between 2m and 3m, and the top angle of the wire rope at both ends is any size between 40° and 60°. The bottom of the hanging point of the transport channel and the contact part of the wire rope are wrapped with 20mm thick rubber pads, and anti-slip measures are taken to fix the wire rope after hanging.

[0022] Furthermore, in step S4, the two ends of the transport channel are tied and temporarily fixed before cutting, and then the hook is slowly lifted to make the wire rope reach a tensioned state, and then the connecting structure of the transport channel is cut and separated; when cutting, start from the high hanging point of the transport channel, and complete the cutting process from top to bottom.

[0023] Compared with the prior art, the method for dismantling a transport channel across an existing pipeline group of the present invention has the following beneficial effects: the method for dismantling a transport channel across an existing pipeline group mainly includes: building a rigid protective shed, dividing a dismantling operation area and a warning area, using three cranes to perform hoisting and dismantling operations in a three-machine lifting manner, simultaneously tightening the wire rope and cutting the connecting structure, three cranes cooperating to lift and transfer to the unloading area, and cutting and transporting in sections away from the dismantling operation area. The use of a rigid protective shed can effectively protect the existing pipeline group, and the three-machine lifting method can reduce the risk of tipping or falling objects during hoisting and dismantling, avoid the risk of damage to the existing pipeline group during the hoisting process, ensure the safety of the dismantling construction, and at the same time save the need to set up a temporary cradle, thereby significantly shortening the dismantling period. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a top view schematic diagram of a transport channel and a rigid protection shed across an existing pipeline group in an embodiment of the present invention;

[0025] Figure 2 is a schematic front view of a rigid protective shed in an embodiment of the present invention;

[0026] Figure 3 is a schematic side view of a rigid protective shed in an embodiment of the present invention;

[0027] Figure 4 is a construction top view of steps S3 to S5 of the method for dismantling a transport channel across an existing pipeline group in an embodiment of the present invention;

[0028] Figure 5 is a construction front view of step S5 of the method for dismantling a transport channel across an existing pipeline group in an embodiment of the present invention;

[0029] In the figure: 1-existing pipeline group, 2-transport channel, 3-rigid protection shed, 31-side structures, 32-upper structure, 4-crane, 40-wire rope, 41-first crane, 42-second crane, 43-third crane. DETAILED DESCRIPTION

[0030] The specific implementation of the present invention is further described in detail below in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0031] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like used in the present invention to indicate the orientation or position relationship are based on the orientation or position relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0032] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0033] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be directly connected or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0034] like Figures 1 to 5 As shown, a method for dismantling a transport channel across an existing pipeline group according to an embodiment of the present invention comprises the following steps:

[0035] S1. Build a rigid protective shed 3 at the intersection of the existing pipeline group 1 and the transport channel 2, and the length and width of the rigid protective shed 3 exceed the demolition operation range of the transport channel 2. It should be noted that a fireproof cushion is laid on the top of the existing pipeline group 1. The fireproof cushion is a fireproof ceramic fiber needle-punched blanket, and the two sides of the existing pipeline group 1 are wrapped and fixed to prevent igniters from falling during the cutting operation. Specifically, the length of the rigid protective shed 3 is 14.5m, the width is 12m, and the height is 7.5m. It covers the demolition operation range of the transport channel 2 to prevent dumping or falling objects from damaging the existing pipeline group 1.

[0036] In this embodiment, in step S1, the rigid protection shed 3 includes two side structures 31 and an upper structure 32. Both the two side structures 31 and the upper structure 32 use double-row Bailey frames, the spacing between the double-row Bailey frames is 0.9m, and the double-row Bailey frames are fixed with stained glass windows. The upper part of the rigid protection shed 3 is also covered with a layer of color steel plate. The two side structures 31 are built with five layers of Bailey frames, and the upper and lower Bailey frames are fixed with high-strength bolts. The upper part of the rigid protection shed 3 is covered with color steel plates to prevent fragments from damaging the existing pipeline group 1.

[0037] Specifically, the assembly process of the Bailey frame is as follows: 1. First, assemble the Bailey frame on the ground according to the size requirements using a 0.45m support frame, and then transport it to the location; 2. Mark the position of the Bailey frame on the cap beam; 3. Hoist the Bailey beam to the designed position; 4. Install the pins in sequence; 5. After the Bailey frame is installed in place, use bolts to fix it horizontally and vertically.

[0038] S2. Divide the demolition operation area and the warning area, and conduct a comprehensive cleanup of transport channel 2.

[0039] S3. Use three cranes 4 to perform hoisting and dismantling operations in a three-machine lifting manner. The maximum operating distance of the three cranes 4 is greater than the width of the rigid protective shed 3. Among them, the three cranes 4 are the first crane 41, the second crane 42 and the third crane 43; the first crane 41 is arranged on the unloading side of the existing pipeline group 1, and the first crane 41 is hoisted and connected to one end of the transportation channel 2; the second crane 42 is arranged on the unloading side of the existing pipeline group 1, and the second crane 42 is hoisted and connected to the middle of the transportation channel 2; the third crane 43 is arranged on the other side of the existing pipeline group 1, and the third crane 43 is hoisted and connected to the other end of the transportation channel 2. The three cranes 4 uniformly, evenly, slowly and stably implement the hoisting and dismantling operations.

[0040] As a further preferred scheme, in step S3, the first crane 41 and the second crane 42 are distributed on both sides of the transport channel 2, and the second crane 42 and the third crane 43 are distributed on the same side of the transport channel 2; the maximum operating distance of the crane 4 refers to the maximum range of motion of the crane 4 arm in a direction parallel to the transport channel 2.

[0041] In this embodiment, after weight verification, the weight of the transport channel 2 is 60t, the weight of the three sets of wire ropes and slings is 1.5t*3=4.5t, the total weight is 64.5t, and the minimum shared load of each crane 4 is 21.5t. Considering the dynamic load coefficient of 1.1 and the imbalance coefficient of 1.2, the theoretical shared load of each crane 4 is (64.5t / 3)*1.1*1.2=28.4t. In step S3, the theoretical shared load of the three cranes 4 is one third of the total weight of the transport channel 2, that is, the theoretical shared load is 26t, which is greater than 20t; the maximum lifting weights of the first crane 41, the second crane 42, and the third crane 43 are all greater than 1.5 times the theoretical shared load of the three cranes 4.

[0042] Furthermore, in step S3, the first crane 41 is a 300t truck crane, and the third crane 43 is a 350t truck crane. The first crane 41 and the third crane 43 are used to undertake the main lifting task; the second crane 42 is a 350t truck crane, which is used to undertake the protection task to resolve the risk of the lifting link. Figure 4 As shown, referring to the plane map orientation, the first crane 41 is located on the northeast side of the transport channel 2, with an operating radius of ≤12m, a boom of 31m, and a maximum lifting capacity of 52t; the second crane 42 is located in the middle of the west side of the transport channel 2, with an operating radius of ≤12m, a boom of 20.2m, and a maximum lifting capacity of 88t; the third crane 43 is located on the southwest side of the transport channel 2, with an operating radius of ≤18m, a boom of 25.3m, and a maximum lifting capacity of 49.8t.

[0043] In step S3, the lifting points of the first crane 41 and the third crane 43 are both located 1.5m away from the end of the transport channel 2, and the lifting point of the second crane 42 is located in the middle of the transport channel 2. It should be noted that the wire rope of the crane 4 is hung by passing through the steel beam above the node of the transport channel 2, and is connected and fixed with a 35t clamp, and the steel structure beam is used to prevent the lifting point from sliding; the vertical height of the wire rope 40 after hanging is any size between 2m and 3m, and the top angle of the wire rope 40 at both ends is any size between 40° and 60°. The bottom of the lifting point of the transport channel 2 and the contact part of the wire rope 40 are wrapped with 20mm thick rubber pads, and anti-slip measures are taken to fix the wire rope 40 after hanging.

[0044] S4, the three cranes 4 synchronously reel in the steel wire rope 40 to a tensioned state, and cut and separate the connection structure of the transport channel 2. In step S4, before cutting, the two ends of the transport channel 2 are temporarily fixed by tying, and then the steel wire rope 40 is slowly hooked to reach a tensioned state, and then the connection structure of the transport channel 2 is cut and separated.

[0045] The cutting process is as follows: 1. Oxygen solvent cutting is used, and the cutting part is the connecting bolts between the support base and the transport channel 2; 2. The cutting order is to start from the high hanging point of the transport channel 2 and complete the cutting from top to bottom; 3. The hanging funnel receives the cut spark residue to avoid falling and prevent fire hazards; 4. The distance between the cutting connection bolt position and the existing pipeline group 1 is 7m to 15m, and the distance for hot work can be safely controlled; 5. When cutting, a small fireproof baffle is set on the side close to the existing pipeline group 1 to prevent sparks from flying; 6. Operators wear safety helmets, non-slip shoes, gloves, protective goggles and work clothes, hang safety ropes and safety belts for protection. The cutting operation is divided into two groups, each group is equipped with three people, one person hangs the safety rope and safety belt for cutting operation, and the other two cooperate and coordinate; 7. After checking that the cutting is completed, evacuate safely.

[0046] S5. The three cranes 4 coordinately lift the transport channel 2, transfer the transport channel 2 and lower it to an area outside the rigid protective shed 3. The signalman instructs the hoist to slowly lift the hook, slowly lift the transport channel 2 and place it in the designated area on the ground. Figure 5 As shown, considering the large longitudinal slope of the transport channel 2, the first crane 41 at the low end is first lifted for leveling, the second crane 4 in the middle applies the corresponding lifting force, and then the third crane 43 at the high end applies the corresponding lifting force, and the distribution is slowly adjusted until the lifting force of each crane 4 reaches a balanced lifting force value. Finally, the three cranes 4 are uniformly, evenly, slowly and stably moved to the designated unloading position, and then uniformly and evenly lowered to the ground.

[0047] S6. Cut into sections, transport away from the demolition area, clean up the site and restore traffic in a timely manner.

[0048] The working process of the present invention is: building a rigid protective shed, dividing the demolition operation area and the warning area, using three cranes to perform the lifting and demolition operation in a three-machine lifting method, simultaneously tightening the wire rope and cutting the connecting structure, three cranes cooperating to lift and transfer to the unloading area, and cutting and transporting the demolition operation area in sections. The use of the rigid protective shed 3 can effectively protect the existing pipeline group 1, and the three-machine lifting method can reduce the risk of tipping or falling objects during lifting and demolition, avoid the risk of damage to the existing pipeline group 1 during the lifting process, ensure the safety of the demolition construction, and at the same time save the need to set up a temporary tire frame, thereby significantly shortening the demolition period.

[0049] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and substitutions can be made without departing from the technical principles of the present invention. These improvements and substitutions should also be regarded as the scope of protection of the present invention.

Claims

1. A method for dismantling a transport channel across an existing pipeline group, characterized in that: The following steps are involved: S1. A rigid protective shed is built at the intersection of the existing pipeline group and the transport channel, and the length and width of the rigid protective shed exceed the demolition operation range of the transport channel; S2. Divide the demolition operation area and the warning area, and conduct a comprehensive cleanup of the transportation channel; S3. Use three cranes to carry out the lifting and dismantling operation in a three-machine lifting manner, and the maximum operating distance of the three cranes is greater than the width of the rigid protective shed; S4, the three cranes synchronously reel in the steel wire ropes to a tensioned state, and cut and separate the connecting structure of the transport channel; S5. Three cranes collaboratively lift the transport passage, transfer the transport passage, and lower it to an area outside the rigid protective shed; S6. Cut into sections, transport away from the demolition area, and clean up the site.

2. The method for dismantling a transport channel across an existing pipeline group according to claim 1 is characterized in that: In step S1, a fireproof cushion is laid on the top of the existing pipeline group, wherein the fireproof cushion is a fireproof ceramic fiber needle-punched blanket, and the two sides of the existing pipeline group are wrapped and fixed.

3. The method for dismantling a transport channel across an existing pipeline group according to claim 1 is characterized in that: In step S1, the rigid protective shed includes two side structures and an upper structure. Both the two side structures and the upper structure use double-row Bailey frames with a spacing of 0.9m. The double-row Bailey frames are fixed with stained glass windows. The upper part of the rigid protective shed is also covered with a layer of color steel plate.

4. The method for dismantling a transport channel across an existing pipeline group according to claim 1 is characterized in that In step S3, the three cranes are respectively a first crane, a second crane and a third crane; the first crane is arranged on the unloading side of the existing pipeline group, and the first crane is hoisted and connected to one end of the transport channel; The second crane is arranged on the unloading side of the existing pipeline group, and the second crane is hoisted and connected to the middle of the transportation channel; the third crane is arranged on the other side of the existing pipeline group, and the third crane is hoisted and connected to the other end of the transportation channel.

5. The method for dismantling a transport channel across an existing pipeline group according to claim 4 is characterized in that In step S3, the first crane and the second crane are distributed on both sides of the transport channel, and the second crane and the third crane are distributed on the same side of the transport channel; the maximum operating distance of the crane refers to the maximum range of motion of the crane boom in a direction parallel to the transport channel.

6. The method for dismantling a transport channel across an existing pipeline group according to claim 4 is characterized in that In step S3, the theoretical shared load of the three cranes is one third of the total weight of the transport channel, and the maximum lifting weights of the first crane, the second crane, and the third crane are all greater than 1.5 times the theoretical shared load of the three cranes.

7. The method for dismantling a transport channel across an existing pipeline group according to claim 4 is characterized in that In step S3, the first crane is a 300t truck crane, and the third crane is a 350t truck crane. The first crane and the third crane are used to undertake the main lifting task; the second crane is a 350t truck crane, which is used to undertake the protection task.

8. The method for dismantling a transport channel across an existing pipeline group according to claim 4 is characterized in that In step S3, the lifting points of the first crane and the third crane are both located 1.5 m away from the ends of the transport passage, and the lifting point of the second crane is located in the middle of the transport passage.

9. The method for dismantling a transport channel across an existing pipeline group according to claim 1, characterized in that In step S3, the wire rope of the crane is hung by passing through the steel beam above the node of the transport channel and connected and fixed with a 35t clamp, and the steel structure beam is used to prevent the hanging point from sliding; the vertical height of the wire rope after hanging is any size between 2m and 3m, and the top angle of the wire rope at both ends is any size between 40° and 60°. The bottom of the hanging point of the transport channel and the contact part of the wire rope are wrapped with 20mm thick rubber pads, and anti-slip measures are taken to fix the wire rope after hanging.

10. The method for dismantling a transport channel across an existing pipeline group according to claim 1, characterized in that: In step S4, the two ends of the transport channel are tied and temporarily fixed before cutting, and then the hook is slowly lifted to make the wire rope reach a tensioned state, and then the connecting structure of the transport channel is cut and separated; when cutting, start from the high hanging point of the transport channel, and complete the cutting process from top to bottom.

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