Directly-buried pipeline laying device and construction method

Abstract

The invention relates to the technical field of pipeline laying, in particular to a directly-buried pipeline laying device which comprises four machine bases distributed in a rectangular shape and a plurality of universal wheels installed below the machine bases, and the two ends of a wrapping steel belt are driven to be wound through a winding motor, so that the wrapping steel belt and a pipeline are placed according to the overall height. By adjusting the rotation angle of the fixed pulley, the position of the vertical point of the pull rope at the two ends of the wrapping steel belt is adjusted, it is ensured that the wrapping steel belt and the pull rope are not in contact with the inner wall of the groove, and therefore the device can adapt to grooves of different widths, and the construction efficiency is improved. In addition, along with rotation adjustment of the fixed pulleys, the height of the ground grabbing plates located below the machine bases is synchronously lowered till the ground grabbing plates are inserted into the ground on the two sides of the groove, and therefore the stability of the four machine bases, namely the stability of the whole device is reinforced in the pipeline paving process, and paving is further convenient.

Description

Technical Field

[0001] The present invention relates to the technical field of pipeline laying, and in particular to a direct buried pipeline laying device and a construction method. Background Art

[0002] The direct burial installation method is currently widely used in pipeline projects, and has achieved good application results to a certain extent. It has great advantages over the current traditional trench laying method in my country. In the actual construction process, it is necessary to follow its specific construction method to ensure the continuity of the construction process and the overall quality.

[0003] Traditional direct buried pipeline laying includes trench excavation, foundation construction, pipeline laying, pipeline testing, and laying backfilling. During the pipeline laying process, manual handling is generally used due to the different outer diameter specifications of the pipeline.

[0004] However, some pipelines, such as steel pipelines, are heavy, and manual transportation is time-consuming and laborious, requiring the use of lifting tools, such as cranes. However, the crane itself is heavy and is not suitable for laying pipelines in soft soil materials. At the same time, the crane shakes greatly during the lifting process, which is not conducive to the precise location of the pipeline and causes inconvenience in laying. Summary of the invention

[0005] In view of the above-mentioned shortcomings of the prior art, the present invention provides a direct buried pipeline laying device and a construction method, which can effectively solve the problem of the inconvenience of using the prior art.

[0006] To achieve the above objectives, the present invention is implemented through the following technical solutions:

[0007] The present invention provides a direct buried pipeline laying device, comprising four machine bases distributed in a rectangular shape and a plurality of universal wheels installed below the machine bases, a synchronous adjustment component comprising a rotating rod with one end rotatably installed in the machine base and the other end extending out of the machine base, a fixed pulley being installed at one end of the rotating rod extending out of the machine base, the synchronous adjustment component also comprising a gripping plate which is lifted and slidably installed below the machine base and is in compression and contact with the ground, the gripping plate moves synchronously with the rotating rod, a retractable assembly comprising a retractable wheel rotatably arranged on the tops of a plurality of machine bases, a pull rope which is wound around the retractable wheel and is in rolling contact with the fixed pulley, hooks are installed at the ends of the pull ropes, and a detachable hook wrapped with a steel belt is hung between two corresponding hooks, a spacing adjustment component comprising a screw rod rotatably installed on two machine bases on the same side, and also comprising a nut seat which is respectively threadedly mounted on the corresponding screw rod, and two of the nut seats are respectively fixedly mounted on the two machine bases on the other side.

[0008] Furthermore, the lower bottom of the machine base is fixed with a base, and a groove is provided in the base for facilitating the lifting and sliding of the gripping plate. Several universal wheels are respectively installed at the four corners of the corresponding lower bottom of the base, and the side walls of the machine base are provided with storage cavities for facilitating the storage of the rotating rod and the fixed pulley.

[0009] Furthermore, the synchronous adjustment component also includes a driving motor fixedly mounted on the machine base, the output end of the driving motor extends into the corresponding machine base and is fixedly mounted with a gear, one side of the gear is meshed with a bent rod rack, the bottom end of the bent rod rack extends through the groove and is detachably mounted with a gripping plate, and the rotating rod is vertically fixedly mounted on the output end of the driving motor.

[0010] Furthermore, the retractable assembly also includes a fixing seat fixedly mounted on the top of the corresponding machine base, and a retractable motor is fixedly mounted on the outer wall of the fixing seat. The output end of the retractable motor extends into the fixing seat and is fixedly connected to the corresponding retractable wheel.

[0011] Furthermore, both ends of the wrapped steel belt are equipped with lifting ears, and both of the lifting ears are penetrated by a hanging hole for convenient and detachable hanging buckle with a corresponding hook.

[0012] Furthermore, the spacing adjustment assembly also includes a fixed block fixedly mounted on two of the machine bases, one end of the screw rod rotates and passes through the fixed block, a servo motor is fixedly mounted on one side of the fixed block, and an output end of the servo motor is fixedly connected to an end of the screw rod.

[0013] Furthermore, the end of the screw rod close to the fixed block is fixedly sleeved with a first blocking piece that can be pressed and interfered with the fixed block, and the end of the screw rod away from the fixed block is fixedly sleeved with a second blocking piece that can be pressed and interfered with the nut seat.

[0014] A direct buried pipeline installation construction method, including trench excavation, foundation construction, pipeline laying, pipeline testing and laying backfill;

[0015] S1. The trench excavation refers to determining the depth and width of the trench according to the actual construction plan, and determining the minimum excavation width of the trench bottom according to the actual conditions of the construction site; secondly, before excavating the trench, construction personnel are required to survey the soil conditions of the area to be excavated to ensure the overall stability and strength of the soil foundation.

[0016] S2. The foundation construction refers to the need to level the site and measure the waist piles after the earth is excavated to the required elevation according to the construction plan. When the land bearing capacity reaches a certain level, a layer of gray soil cushion needs to be laid on the site and inspected by the supervising engineer. After the inspection is completed, a sand layer is laid to reduce damage to the pipeline.

[0017] S3. The pipeline laying refers to the lifting and assembly of the pipeline;

[0018] S3.1. The lifting of the pipeline needs to adjust the placement of the device as a whole according to the length of the pipeline. First, the lifting ears at both ends of the wrapped steel belt are respectively hooked on the corresponding hooks, and then the servo motor is started to drive the screw to rotate, and then the nut seat, that is, the corresponding machine base, is linearly moved. Since a universal wheel is installed under the base at the bottom of the machine base, the distance between the two wrapped steel belts can be adjusted. Then the pipeline to be lifted is placed on the two wrapped steel belts. The pipeline can be attached and wrapped on pipelines with different outer diameters. Then the four machine bases are pushed as a whole to the pipeline assembly station, and two driving motors are started to drive the gears to rotate, so as to mesh and drive the bent rod rack to descend in height, and then push the gripping plate to squeeze and contact the ground, so as to fix the positions of the four machine bases. Along with the drive of the driving motor, the rotating rod and the fixed pulley are also driven to rotate synchronously until the fixed pulley and the corresponding pull rope are in relative rolling contact, and the distance between the two pull ropes is adjusted. Finally, the winding motor is started to drive the retracting wheel to rotate, and then the pull rope is driven to start releasing the line, thereby driving the hook, the wrapped steel belt and the pipeline to descend in height until the pipeline is placed in the groove, and the lifting of the pipeline is completed;

[0019] S3.2, the assembly of pipelines means that before connecting the pipelines, the various parameters in the pipelines need to be determined to meet the specific requirements of the construction drawings, and the location of the pipelines needs to be determined again. In order to ensure the tight connection of the pipe openings, the pipe openings can be connected by butt welding, which can ensure the straightness of the pipelines and prevent the pipelines from deviating from the designed position. The actual welding situation needs to be determined according to the specific welding standards, so as to ensure the overall quality of welding;

[0020] According to the actual situation, a natural compensation device is selected, and the curved part is connected by welding to ensure the sealing of the pipeline. For thermal pipelines, in order to reduce the thermal expansion and contraction caused by temperature in the pipeline, corresponding compensators need to be installed in each section of the pipeline to make the stress in the pipeline meet the relevant requirements. When installing the compensation device, it is necessary to pay attention to the consistency of the center line of the compensator with the center line of the pipeline.

[0021] S4. The pipeline test refers to soaking the pipeline with water. The soaking time should be kept for more than 24 hours. During the soaking process, people need to pay special attention to the interface of the pipeline. In the process of pressure testing the pipeline, flushing is usually used. Under normal circumstances, the water pressure should be around 0.35MPa, and the actual flushing time should be more than 12h. After two hours of water pressure test, there is still no water seepage in the pipeline, which means that the strength of the pipeline can meet the relevant requirements.

[0022] S5. The laying backfill means that after the pipeline is installed, the trench needs to be backfilled. The main method of backfilling is layered compaction. The backfilled earth cannot contain debris such as gravel and bricks.

[0023] Compared with the known prior art, the technical solution provided by the present invention has the following beneficial effects:

[0024] 1. Set up four machine bases that are distributed in a rectangular shape and can be adjusted to each other, and a wrapping steel belt that can fully fit and wrap pipes of different outer diameters is detachably installed between two adjacent machine bases. The wrapping steel belt is reeled up at both ends by a reeling motor to achieve the placement of the wrapping steel belt and the overall height of the pipe, so as to facilitate the stable lowering of the pipe until it is accurately buried in the groove, which is convenient for paving;

[0025] 2. A fixed pulley is rotatably installed on the inner wall of the machine base. By adjusting the rotation angle of the fixed pulley, the position of the vertical points of the pull ropes at both ends of the wrapped steel belt can be adjusted to ensure that the wrapped steel belt and the pull rope will not contact the inner wall of the groove. It can adapt to grooves of different widths and will not affect the normal laying of the pipeline. In addition, with the rotation adjustment of the fixed pulley, the gripping plate under the machine base will synchronously decrease in height until it is inserted into the ground on both sides of the groove, thereby reinforcing the stability of the four machine bases, that is, the overall device, during the pipeline laying process, and further enhancing the convenience of laying. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0027] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0028] Figure 2 It is a schematic diagram of the base structure of the present invention;

[0029] Figure 3 It is a structural schematic diagram of the synchronous adjustment component of the present invention;

[0030] Figure 4 It is a schematic diagram of the structure of the retractable assembly of the present invention;

[0031] Figure 5 It is a schematic diagram of the wrapped steel strip structure of the present invention;

[0032] Figure 6 It is a schematic diagram of the structure of the spacing adjustment component of the present invention.

[0033] The numbers in the figure represent:

[0034] 1. Machine base; 11. Base; 12. Universal wheel;

[0035] 21. driving motor; 22. gear; 23. bent rod rack; 24. gripping plate; 25. rotating rod; 26. fixed pulley;

[0036] 31. Fixed seat; 32. Winding motor; 33. Winding and releasing wheel; 34. Pull rope; 35. Hook;

[0037] 4. Wrapping steel belt; 41. Lifting lug; 42. Hanging hole;

[0038] 51. fixing block; 52. nut seat; 53. screw rod; 54. servo motor; 55. first baffle; 56. second baffle. DETAILED DESCRIPTION

[0039] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0040] The present invention will be further described below in conjunction with the embodiments.

[0041] Example 1

[0042] Reference Figure 1-6, which is the first embodiment of the present invention, a direct buried pipeline laying device, including four machine bases 1 distributed in a rectangular shape and a plurality of universal wheels 12 installed below the machine base 1, a synchronous adjustment component including a rotating rod 25 with one end rotatably installed in the machine base 1 and the other end extending out of the machine base 1, a fixed pulley 26 is installed at one end of the rotating rod 25 extending out of the machine base 1, and the fixed pulley 26 can change the suspension position of the hook 35 to adapt to the laying of pipelines in grooves of different widths, and the synchronous adjustment component also includes a gripping plate 24 that is installed under the machine base 1 and squeezes and contacts the ground, and the gripping plate 24 is a plate-like structure with a plurality of ground nails installed at the bottom, and the ground nails are inserted into the ground to increase the direct friction resistance between the machine base, that is, the entire device, and the ground. The gripping plate 24 moves synchronously with the rotating rod 25. The retracting and releasing assembly includes a retracting and releasing wheel 33 rotatably arranged on the top of the plurality of machine bases 1. A pull rope 34 rolling in contact with the fixed pulley 26 is wound around the retracting and releasing wheel 33. Hooks 35 are installed at the ends of the pull ropes 34. The wrapped steel belt 4 is detachably hooked between the two corresponding hooks 35. The spacing adjustment assembly includes a screw rod 53 rotatably installed on the two machine bases 1 on the same side, and also includes nut seats 52 respectively threadedly mounted on the corresponding screw rods 53. The two nut seats 52 are respectively fixedly mounted on the two machine bases 1 on the other side. The device is connected to an external power supply, and the power supply supplies power to the driving motor 21, the winding motor 32 and the servo motor 54.

[0043] Example 2

[0044] Reference Figure 2-3 , which is the second embodiment of the present invention. This embodiment is different from the first embodiment in that: the bottom of the base 1 is fixed with a base 11, and a groove is provided in the base 11 for facilitating the lifting and sliding of the gripping plate 24, so as to ensure that the gripping plate 24 is stored in the groove and does not contact the ground during the adjustment of the position and transportation of the device. A plurality of universal wheels 12 are respectively installed at the four corners of the bottom of the corresponding base 11, and the side walls of the base 1 are provided with a storage cavity for facilitating the storage of the rotating rod 25 and the fixed pulley 26, so as to prevent the rotating rod 25 and the fixed pulley 26 from receiving external objects during transportation. The synchronous adjustment component also includes a driving motor 21 fixedly mounted on the machine base 1, the output end of the driving motor 21 extends into the corresponding machine base 1, and a gear 22 is fixedly mounted thereon, and a bent rod rack 23 is meshedly mounted on one side of the gear 22, the bottom end of the bent rod rack 23 extends through the groove, and a gripping plate 24 is detachably mounted thereon, and a rotating rod 25 is vertically fixedly mounted at the output end of the driving motor 21, and the specifications of the gripping plate 24 can be replaced according to the actual terrain, for example, in a pipeline paving environment with hard soil, it can be replaced with a gripping plate 24 with a flat bottom.

[0045] The remaining structures are the same as those of Example 1.

[0046] Example 3

[0047] Reference Figure 4-6 , which is the third embodiment of the present invention. This embodiment is different from the second embodiment in that: the retractable assembly also includes a fixing seat 31 fixedly installed on the top of the corresponding machine base 1, and a reeling motor 32 is fixedly installed on the outer wall of the fixing seat 31. The output end of the reeling motor 32 extends into the fixing seat 31 and is fixedly connected to the corresponding retractable wheel 33. Both ends of the wrapped steel belt 4 are equipped with lifting ears 41. The two lifting ears 41 are penetrated with hanging holes 42 that are convenient for detachable hanging buckles with corresponding hooks 35. When the wrapped steel belt 4 wraps the pipe and lowers its height until it is completely paved on the support seat in the groove, the lifting ears 41 automatically The corresponding hook 35 is disengaged, which facilitates the removal of the wrapped steel belt 4. The spacing adjustment component also includes a fixed block 51 fixedly installed on two of the machine bases 1. One end of the screw rod 53 rotates and passes through the fixed block 51. A servo motor 54 is fixedly installed on one side of the fixed block 51. The output end of the servo motor 54 is fixedly connected to the end of the screw rod 53. The end of the screw rod 53 close to the fixed block 51 is fixedly sleeved with a first baffle 55 that can be squeezed and contacted with the fixed block 51, and the end of the screw rod 53 away from the fixed block 51 is fixedly sleeved with a second baffle 56 that can be squeezed and contacted with the nut seat 52. The two baffles can prevent the nut seat 52 from being separated from the screw rod 53.

[0048] The remaining structure is the same as that of Example 2.

[0049] Example 4

[0050] Reference Figure 1-6 , which is the fourth embodiment of the present invention, and this embodiment is different from the third embodiment in that: a direct buried pipeline installation construction method, including trench excavation, foundation construction, pipeline laying, pipeline testing and laying backfill;

[0051] S1. Trench excavation refers to the process of trench excavation. The depth and width of the trench need to be determined according to the actual construction plan, and the minimum excavation width of the trench bottom needs to be determined according to the actual situation of the construction site. Secondly, before trench excavation, construction personnel need to survey the soil conditions of the area to be excavated to ensure the overall stability and strength of the soil foundation. In the case of a large trench, mechanical excavation can be used, but it should be noted that when the excavation depth differs from the required depth by 20cm, manual excavation is required. Finally, construction personnel need to determine the amount of soil to be backfilled based on the actual size of the trench and the actual situation of the pipeline, and directly abandon the excess soil to ensure the overall safety of trench excavation.

[0052] S2. Foundation construction means that after the earth is excavated to the required elevation according to the construction plan, the site needs to be leveled and the waist piles need to be measured. In order to improve the overall bearing capacity of the foundation, it can be compacted. When the land bearing capacity reaches a certain level, a layer of gray soil cushion needs to be laid on the site and inspected by the supervising engineer. After the inspection is completed, a sand layer is laid to reduce damage to the pipeline.

[0053] S3. Pipeline laying refers to the lifting and assembly of pipelines;

[0054] S3.1. The lifting of the pipeline needs to be adjusted according to the placement position of the entire device according to the length of the pipeline. First, the ears 41 at both ends of the wrapped steel belt 4 are respectively hooked on the corresponding hooks 35, and then the servo motor 54 is started to drive the screw 53 to rotate, thereby driving the nut seat 52, that is, the corresponding machine base 1 to move linearly. Since a universal wheel 12 is installed under the base 11 at the bottom of the machine base 1, the resistance of this step is relatively small, so as to adjust the distance between the two wrapped steel belts 4, and then place the pipeline to be lifted on the two wrapped steel belts 4. Due to the deformable characteristics of the wrapped steel belt 4, it can be attached and wrapped on pipelines with different outer diameters. Then, the four machine bases 1 are pushed as a whole to the pipeline assembly station and started. The two driving motors 21 drive the gear 22 to rotate, thereby meshing and driving the bent rod rack 23 to descend in height, thereby pushing the gripping plate 24 to squeeze and contact the ground, so as to achieve the fixation of the positions of the four machine bases 1. Along with the driving of the driving motor 21, the rotating rod 25 and the fixed pulley 26 are also synchronously driven to rotate until the fixed pulley 26 and the corresponding pull rope 34 are in relative rolling contact, and the spacing between the two pull ropes 34 is adjusted to avoid the pull rope 34 from contacting the inner wall of the groove, affecting the smooth laying of the pipeline. Finally, the winding motor 32 is started to drive the retracting wheel 33 to rotate, thereby driving the pull rope 34 to start paying out the line, thereby driving the hook 35 and the wrapped steel belt 4 and the pipeline to descend in height until the pipeline is placed in the groove, completing the lifting of the pipeline;

[0055] S3.2, the assembly of pipelines means that before connecting the pipelines, it is necessary to determine the various parameters in the pipelines to meet the specific requirements of the construction drawings, and once again determine the location of the pipelines. In order to ensure that the pipe mouths are tightly connected, the pipe mouths need to be processed before the pipelines are connected. In general, the pipe mouths can be connected by butt welding, which can ensure the straightness of the pipelines and prevent the pipelines from deviating from the designed position. The actual welding situation needs to be determined according to the specific welding standards to ensure the overall quality of welding. According to the actual situation, a natural compensation device is selected, and the curved part is generally not connected by flange connection but by welding to ensure the closure of the pipeline. For thermal pipelines, in order to reduce the thermal expansion and contraction caused by temperature in the pipeline, corresponding compensators need to be installed in each section of the pipeline to make the stress in the pipeline meet the relevant requirements. When installing the compensation device, it is necessary to pay attention to the consistency of the center line of the compensator with the center line of the pipeline.

[0056] S4. Pipeline testing refers to the process of filling and immersing the pipeline with water in order to test the welding quality and overall sealing degree of the pipeline, and at the same time determine the actual strength of the pipeline. Generally, the filling and immersion time should be kept for more than 24 hours. During the immersion process, people need to pay special attention to the interface of the pipeline. In the process of pressure testing the pipeline, flushing is usually used. Generally, the water pressure should be around 0.35MPa, and the actual flushing time should be more than 12h. After two hours of water pressure test, there is still no water seepage in the pipeline, which means that the strength of the pipeline can meet the relevant requirements.

[0057] S5. Laying backfill means that after the installation of the pipeline is completed, the trench needs to be backfilled. The main method of backfilling is layered compaction, which can ensure the overall strength of the soil above the pipeline. In addition, it should be noted that the backfilled soil cannot contain debris such as gravel and bricks.

[0058] The remaining structures are the same as those of Example 1.

[0059] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the protection scope of the technical solutions of the embodiments of the present invention.

Claims

1. A direct buried pipeline laying device, comprising four machine bases (1) distributed in a rectangular shape and a plurality of universal wheels (12) installed below the machine bases (1), characterized in that: Also includes: The synchronous adjustment component comprises a rotating rod (25) having one end rotatably mounted in a machine base (1) and the other end extending out of the machine base (1); a fixed pulley (26) is mounted on the end of the rotating rod (25) extending out of the machine base (1); the synchronous adjustment component also comprises a gripping plate (24) mounted under the machine base (1) in a lifting and sliding manner to press against the ground; the gripping plate (24) moves synchronously with the rotating rod (25); The retracting and releasing assembly comprises a retracting and releasing wheel (33) rotatably arranged on the top of a plurality of machine bases (1), a pull rope (34) rollingly contacting with a fixed pulley (26) is wound around the retracting and releasing wheel (33), and hooks (35) are installed at the ends of the pull ropes (34); The steel belt (4) is wrapped, and the detachable hook is between the corresponding two hooks (35); The spacing adjustment component comprises a screw rod (53) rotatably mounted on two machine bases (1) on the same side, and also comprises nut seats (52) respectively threadedly mounted on the corresponding screw rods (53), and the two nut seats (52) are respectively fixedly mounted on the two machine bases (1) on the other side.

2. A direct buried pipeline laying device according to claim 1, characterized in that: The base (11) is fixedly mounted on the bottom of the base (1), and a groove is provided in the base (11) for facilitating the lifting and sliding of the gripping plate (24). A plurality of universal wheels (12) are respectively installed at the four corners of the bottom of the corresponding base (11), and a storage cavity is provided on the side wall of the base (1) for facilitating the storage of the rotating rod (25) and the fixed pulley (26).

3. A direct buried pipeline laying device according to claim 2, characterized in that: The synchronous adjustment component also includes a driving motor (21) fixedly mounted on the machine base (1); the output end of the driving motor (21) extends into the corresponding machine base (1) and is fixedly mounted with a gear (22); one side of the gear (22) is meshed with a bent rod rack (23); the bottom end of the bent rod rack (23) extends through the groove and is detachably mounted with a gripping plate (24); and the rotating rod (25) is vertically fixedly mounted on the output end of the driving motor (21).

4. A direct buried pipeline laying device according to claim 1, characterized in that: The retractable and retractable components further include fixed seats (31) respectively fixedly mounted on the top of the corresponding machine base (1), a retractable motor (32) being fixedly mounted on the outer wall of the fixed seat (31), an output end of the retractable and retractable motor (32) extending into the fixed seat (31) and fixedly connected to the corresponding retractable and retractable wheel (33).

5. A direct buried pipeline laying device according to claim 1, characterized in that: Both ends of the wrapping steel belt (4) are provided with lifting ears (41), and both of the lifting ears (41) are provided with hanging holes (42) for convenient detachable hanging with corresponding hooks (35).

6. A direct buried pipeline laying device according to claim 1, characterized in that: The spacing adjustment assembly further comprises a fixed block (51) fixedly mounted on two of the machine bases (1); one end of the screw rod (53) rotates and passes through the fixed block (51); a servo motor (54) is fixedly mounted on one side of the fixed block (51); and an output end of the servo motor (54) is fixedly connected to an end of the screw rod (53).

7. A method for laying a direct buried pipeline according to claim 6, characterized in that: The end of the screw rod (53) close to the fixed block (51) is fixedly sleeved with a first blocking piece (55) that can be pressed and abutted against the fixed block (51), and the end of the screw rod (53) away from the fixed block (51) is fixedly sleeved with a second blocking piece (56) that can be pressed and abutted against the nut seat (52).

8. A method for laying a direct buried pipeline, characterized in that: Including trench excavation, foundation construction, pipeline laying, pipeline testing and laying backfill; S1. The trench excavation refers to determining the depth and width of the trench according to the actual construction plan, and determining the minimum excavation width of the trench bottom according to the actual conditions of the construction site; secondly, before excavating the trench, construction personnel are required to survey the soil conditions of the area to be excavated to ensure the overall stability and strength of the soil foundation. S2. The foundation construction refers to the need to level the site and measure the waist piles after the earth is excavated to the required elevation according to the construction plan. When the land bearing capacity reaches a certain level, a layer of gray soil cushion needs to be laid on the site and inspected by the supervising engineer. After the inspection is completed, a sand layer is laid to reduce damage to the pipeline. S3. The pipeline laying refers to the lifting and assembly of the pipeline; S3.

1. The lifting of the pipeline needs to be adjusted according to the placement position of the entire device according to the length of the pipeline. First, the lifting ears (41) at both ends of the wrapped steel belt (4) are respectively hooked on the corresponding hooks (35), and then the servo motor (54) is started to drive the screw rod (53) to rotate, thereby driving the nut seat (52), that is, the corresponding machine base (1) to move linearly. Since a universal wheel (12) is installed below the base (11) at the bottom of the machine base (1), the distance between the two wrapped steel belts (4) can be adjusted, and then the pipeline to be lifted is placed on the two wrapped steel belts (4). The pipeline can be attached and wrapped on pipelines with different outer diameters. Then, the four machine bases (1) are pushed as a whole to the pipeline assembly station, and the two driving wheels are started. The motor (21) is driven to rotate, thereby driving the gear (22) to rotate, thereby meshing and driving the bent rod rack (23) to descend in height, thereby pushing the gripping plate (24) to press against the ground, thereby fixing the positions of the four machine bases (1). Along with the driving of the driving motor (21), the rotating rod (25) and the fixed pulley (26) are also synchronously driven to rotate until the fixed pulley (26) and the corresponding pull rope (34) are in relative rolling contact, and the spacing between the two pull ropes (34) is adjusted. Finally, the winding motor (32) is started to drive the winding and releasing wheel (33) to rotate, thereby driving the pull rope (34) to start releasing the line, thereby driving the hook (35) and the wrapped steel belt (4) and the pipeline to descend in height until the pipeline is placed in the groove, thereby completing the lifting of the pipeline; S3.2, the assembly of pipelines means that before connecting the pipelines, the various parameters in the pipelines need to be determined to meet the specific requirements of the construction drawings, and the location of the pipelines needs to be determined again. In order to ensure the tight connection of the pipe openings, the pipe openings can be connected by butt welding, which can ensure the straightness of the pipelines and prevent the pipelines from deviating from the designed position. The actual welding situation needs to be determined according to the specific welding standards, so as to ensure the overall quality of welding; According to the actual situation, a natural compensation device is selected, and the curved part is connected by welding to ensure the sealing of the pipeline. For thermal pipelines, in order to reduce the thermal expansion and contraction caused by temperature in the pipeline, corresponding compensators need to be installed in each section of the pipeline to make the stress in the pipeline meet the relevant requirements. When installing the compensation device, it is necessary to pay attention to the consistency of the center line of the compensator with the center line of the pipeline. S4. The pipeline test refers to soaking the pipeline with water. The soaking time should be kept for more than 24 hours. During the soaking process, people need to pay special attention to the interface of the pipeline. In the process of pressure testing the pipeline, flushing is usually used. Under normal circumstances, the water pressure should be around 0.35MPa, and the actual flushing time should be more than 12h. After two hours of water pressure test, there is still no water seepage in the pipeline, which means that the strength of the pipeline can meet the relevant requirements. S5. The laying backfill means that after the pipeline is installed, the trench needs to be backfilled. The main method of backfilling is layered compaction. The backfilled earth cannot contain debris such as gravel and bricks.

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