Directly buried pipeline laying device and construction method

Abstract

The application relates to the technical field of pipeline laying, in particular to a direct-buried pipeline laying device which comprises four rectangularly-distributed machine bases and a plurality of universal wheels installed below the machine bases, the two ends of a wrapping steel belt are wound by a winding motor, the overall height of the wrapping steel belt and the pipeline is placed, the pipeline can be steadily lowered to a certain height, and the pipeline can be accurately buried in a groove, the device has the characteristics of convenient laying, the rotating angle of a fixed pulley is adjusted to adjust the position of the vertical point of the two ends of the wrapping steel belt, the wrapping steel belt and the pulling rope are prevented from contacting the inner wall of the groove, the device can adapt to grooves with different widths, the normal laying of the pipeline is not affected, the ground plate below the machine base is lowered in synchronization with the rotation adjustment of the fixed pulley until the ground plate is inserted into the ground on the two sides of the groove, the stability of the four machine bases, that is, the overall device, is reinforced during pipeline laying, and the device has the characteristics of further convenient laying.

Description

TECHNICAL FIELD

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

[0002] The direct-buried laying construction method is currently widely used in pipeline engineering and has achieved good application results to some extent. It has great advantages over the traditional trench laying method in China. In the actual construction process, it needs to be carried out according to its specific construction method to ensure the coherence of the construction link and the overall quality.

[0003] The traditional direct-buried pipeline laying includes steps of trench excavation, foundation construction, pipeline laying, pipeline testing and laying backfill, etc. In the pipeline laying process, due to different outer diameter specifications of the pipeline, manual carrying is generally used.

[0004] However, some pipelines such as steel pipelines are heavy, and manual carrying is time-consuming and laborious, so hoisting tools such as cranes need to be used. However, the crane itself is heavy and is not suitable for pipeline laying environment of soft soil material. Meanwhile, the crane shakes greatly during hoisting, which is not conducive to the accurate point laying of the pipeline and has the problem of inconvenient laying. SUMMARY

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

[0006] To achieve the above purpose, the present application realizes the following technical scheme:

[0007] The present application provides a direct-buried pipeline laying device, which comprises four rectangularly distributed machine seats and a plurality of universal wheels installed below the machine seats. The synchronous adjusting assembly comprises a rotating rod rotatably installed at one end in the machine seat and extending out of the machine seat at the other end. A fixed pulley is installed at one end of the rotating rod extending out of the machine seat. The synchronous adjusting assembly further comprises a grip plate which is slidably installed below the machine seat and is in extrusion contact with the ground. The grip plate moves synchronously with the rotating rod. The folding and unfolding assembly comprises a folding and unfolding wheel rotatably arranged at the top of the plurality of machine seats. A pull rope in rolling contact with the fixed pulley is wound on the folding and unfolding wheel. Hooks are installed at the ends of the pull rope. A steel belt is detachably hung between the corresponding two hooks. The spacing adjusting assembly comprises a lead screw rotatably installed on the two machine seats on the same side. The spacing adjusting assembly further comprises a nut seat which is threadedly sleeved on the corresponding lead screw. The two nut seats are fixedly installed on the two machine seats on the other side.

[0008] Further, the lower bottom of the base is fixedly installed with a base, a groove is formed in the base to facilitate the lifting and sliding of the ground grabbing plate, a plurality of universal wheels are respectively installed at the four corners of the lower bottom of the corresponding base, and a receiving cavity is formed in the side wall of the base to facilitate the storage of the rotating rod and the fixed pulley.

[0009] Further, the synchronous adjusting assembly further comprises a driving motor fixedly installed on the base, the output end of the driving motor extends into the corresponding base, and a gear is fixedly installed on the output end, one side of the gear is engaged with a bent rod rack, the bottom end of the bent rod rack extends into the groove, and a ground grabbing plate is detachably installed on the bottom end of the bent rod rack, and the rotating rod is vertically fixedly installed on the output end of the driving motor.

[0010] Further, the winding and unwinding assembly further comprises a fixing seat fixedly installed on the top of each base, a winding motor is fixedly installed on the outer side wall of the fixing seat, the output end of the winding motor extends into the fixing seat, and the winding motor is fixedly connected with the corresponding winding and unwinding wheel.

[0011] Further, both ends of the steel belt are provided with lifting lugs, and a hanging hole is formed in each lifting lug to facilitate detachable hanging of the corresponding hook.

[0012] Further, the distance adjusting assembly further comprises a fixing block fixedly installed on two of the bases, one end of the lead screw extends through the fixing block, a servo motor is fixedly installed on one side of the fixing block, and the output end of the servo motor is fixedly connected with the end of the lead screw.

[0013] Further, a first blocking piece is fixedly sleeved on one end of the lead screw close to the fixing block, and a second blocking piece is fixedly sleeved on the other end of the lead screw away from the fixing block.

[0014] A direct-buried pipeline laying construction method, comprising trench excavation, foundation construction, pipeline laying, pipeline testing, and laying backfilling;

[0015] S1, the trench excavation refers to determining the depth and width of the trench according to the actual scheme of the construction, and determining the minimum excavation width of the trench bottom according to the actual situation of the construction site; secondly, before excavating the trench, the construction personnel need to survey the soil condition of the area to be excavated, so as to ensure the overall stability and strength of the soil foundation;

[0016] S2, the foundation construction refers to leveling the site after excavating the earthwork to the required elevation according to the construction scheme, measuring the waist pile, and laying a layer of ash soil cushion on the site when the land bearing capacity reaches a certain degree, and checking by the supervising engineer, and laying a sand layer after the checking is completed, so as to reduce the damage to the pipeline.

[0017] S3, the pipeline paving refers to the hoisting and assembly of the pipeline;

[0018] S3.1, wherein the hoisting of the pipeline needs to adjust the placement position of the whole direct-buried pipeline laying device according to the length of the pipeline, first, the lifting lugs at both ends of the wrapped steel belt are hung on the corresponding hooks respectively, then the servo motor is started to drive the screw rod to rotate, and then the nut seat, that is, the corresponding machine seat, moves linearly, because the base under the base at the bottom of the machine seat is installed with universal wheels, the spacing between the two wrapped steel belts is adjusted, the pipeline to be hoisted is placed on the two wrapped steel belts, the wrapped steel belt can be attached to the pipeline with different outer diameter specifications, then the four machine seats are pushed as a whole to the pipeline assembly station, and the two drive motors are started to drive the gear to rotate, thereby engaging the curved rod rack to lower the height, thereby pushing the ground gripping plate to extrude and resist the ground, realizing the fixation of the position of the four machine seats, accompanied by the driving of the drive motor, the rotating rod and the fixed pulley will also rotate synchronously, until the fixed pulley is in relative rolling contact with the corresponding pull rope, and the spacing between the two pull ropes is adjusted, finally the winding motor is started to drive the winding and unwinding wheel to rotate, thereby driving the pull rope to start unwinding, thereby driving the hook and the wrapped steel belt and the pipeline to lower the height, until the pipeline is placed in the groove, completing the hoisting of the pipeline;

[0019] S3.2, wherein the assembly of the pipeline refers to the determination of various parameters in the pipeline before the connection of the pipeline, which meets the specific requirements of the construction drawing, and the position of the pipeline is determined again, in order to ensure the tight connection of the pipe mouth, the way of butt welding can be used to connect the pipe mouths, which can ensure the straightness of the pipeline and will not deviate from the design position, the actual situation of welding needs to be determined according to the specific standard of welding, so as to ensure the overall quality of welding;

[0020] According to the actual situation, the natural compensation device is selected, the curved part of which is connected by welding to ensure the sealing of the pipeline; for the heat pipeline, in order to reduce the thermal expansion and cold contraction phenomenon in the pipeline due to temperature, a corresponding compensator needs to be installed in each paragraph of the pipeline, so as to make the stress in the pipeline meet the relevant requirements, when installing the compensation device, attention should be paid to keep the center line of the compensator consistent with the center line of the pipeline;

[0021] S4, the pipeline test refers to the pipeline irrigation soaking, irrigation soaking time should be maintained at more than 24 hours, in the process of soaking, people need to be observed in particular to the interface of the pipeline, in the process of pressure test of pipeline, usually adopt the way of flushing water, generally, the water pressure should be about 0.35MPa, the actual time of flushing water should be more than 12h, in the two hours of water pressure test, the pipeline still does not appear seepage phenomenon, which shows that the strength of the pipeline can meet the relevant requirements;

[0022] S5, the laying backfill refers to the backfill of the trench after the installation of the pipeline is completed, the main way of backfill is layering tamping, and the earthwork of backfill cannot contain sundries such as gravel and bricks.

[0023] Compared with the known prior art, the technical scheme provided by the application has the following beneficial effects:

[0024] 1. Four rectangularly distributed bases are arranged, the bases can be adjusted relative to each other, and a wrapping steel belt capable of fully wrapping pipes of different outer diameters is detachably mounted between two adjacent bases, the wrapping steel belt is wound at both ends by a winding motor, the overall height of the wrapping steel belt and the pipe is placed, so that the pipe can be stably lowered to a precise point and buried in the trench, and the pipe laying is convenient.

[0025] 2. A fixed pulley is rotatably mounted on the inner side wall of the base, the vertical position of the two ends of the wrapping steel belt is adjusted by adjusting the rotation angle of the fixed pulley, so that the wrapping steel belt and the pulling rope do not contact the inner wall of the trench, which can adapt to trenches of different widths and will not affect the normal laying of the pipe, and the ground plate under the base is lowered in synchronization with the rotation of the fixed pulley, until it is inserted into the ground on both sides of the trench, so that the stability of the four bases, that is, the overall device, is further improved during pipe laying. DETAILED DESCRIPTION

[0026] In order to more clearly illustrate the technical scheme in the embodiments of the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are only some embodiments of the application, and those skilled in the art can obtain other drawings according to these drawings without creative labor.

[0027] Fig. 1 It is the overall structure diagram of the application;

[0028] Fig. 2 It is the base structure diagram of the application;

[0029] Fig. 3 Structure diagram of the synchronous adjusting assembly of the present application;

[0030] Fig. 4 Structure diagram of the retractable assembly of the present application;

[0031] Fig. 5 Structure diagram of the wrapping steel belt of the present application;

[0032] Fig. 6 Structure diagram of the distance adjusting assembly of the present application.

[0033] The numbers in the figures represent respectively:

[0034] 1, 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, retractable wheel; 34, pull rope; 35, hook;

[0037] 4, wrapping steel belt; 41, lifting lug; 42, hanging hole;

[0038] 51, fixed 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 scheme and advantages of the embodiments of the present application clearer, the technical scheme in the embodiments of the present application will be described clearly and completely below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are some of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all the other embodiments obtained by those skilled in the art without any creative work under the premise, belong to the scope of protection of the present application.

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

[0041] Embodiment 1

[0042] Reference Figs. 1-6For the first embodiment of the application, a direct-buried pipeline laying device comprises four rectangularly distributed machine bases 1 and a plurality of universal wheels 12 installed below the machine bases 1, a synchronous adjusting assembly comprises a rotating rod 25 rotatably installed at one end in the machine base 1 and extending out of the machine base 1 at the other end, the rotating rod 25 is provided at one end extending out of the machine base 1 with a fixed pulley 26, the fixed pulley 26 can change the suspension position of a hook 35 to adapt to pipeline laying in grooves of different widths, the synchronous adjusting assembly further comprises a ground grabbing plate 24 which is slidably installed below the machine base 1 and in extrusion contact with the ground, the ground grabbing plate 24 is a plate-shaped structure provided at the lower bottom with a plurality of ground nails, the ground nails are inserted into the ground to increase the direct frictional resistance between the machine base, i.e. the whole device, and the ground, thereby improving the overall stability, the ground grabbing plate 24 moves synchronously with the rotating rod 25, a winding and unwinding assembly comprises a winding and unwinding wheel 33 rotatably arranged at the top of the machine bases 1, the winding and unwinding wheel 33 is wound with a pull rope 34 in rolling contact with the fixed pulley 26, the pull rope 34 is provided at the end with the hook 35, the steel belt 4 is detachably hung between the corresponding two hooks 35, a spacing adjusting assembly comprises a lead screw 53 rotatably installed on the two machine bases 1 on the same side, and further comprises a nut seat 52 threadedly installed on the corresponding lead screw 53, the two nut seats 52 are respectively fixedly installed on the two machine bases 1 on the other side, the device is externally connected with a power supply, the power supply supplies power to the driving motor 21, the winding motor 32 and the servo motor 54.

[0043] Embodiment 2

[0044] With reference to Figs. 2-3 For the second embodiment of the application, the difference between this embodiment and the first embodiment is that the lower bottom of the machine base 1 is fixedly installed with a base 11, the base 11 is provided with a groove for facilitating the lifting and sliding of the ground grabbing plate 24, so as to ensure that the ground grabbing plate 24 is stored in the groove during the adjustment and transportation of the device and does not contact the ground, the plurality of universal wheels 12 are respectively installed at the lower bottom of the four corners of the corresponding base 11, the side walls of the machine base 1 are provided with storage cavities for storing the rotating rod 25 and the fixed pulley 26, so as to avoid damage to the rotating rod 25 and the fixed pulley 26 caused by impact of external objects during transportation, the synchronous adjusting assembly further comprises a driving motor 21 fixedly installed on the machine base 1, the output end of the driving motor 21 extends into the corresponding machine base 1 and is fixedly installed with a gear 22, one side of the gear 22 is engagedly installed with a bent rod rack 23, the bottom end of the bent rod rack 23 extends through the groove and is detachably installed with the ground grabbing plate 24, the rotating rod 25 is vertically fixedly installed at the output end of the driving motor 21, the specification of the ground grabbing plate 24 can be replaced according to the actual terrain, for example, in the pipeline laying environment where the ground is hard, the ground grabbing plate 24 with a flat lower bottom can be replaced.

[0045] The remaining structure is the same as that of embodiment 1.

[0046] Embodiment 3

[0047] Referring to Figs. 4-6 For the third embodiment of the present application, which is different from the second embodiment, the winding and unwinding assembly further comprises a fixed seat 31 fixedly installed on the top of the corresponding base 1, and the outer side wall of the fixed seat 31 is fixedly installed with a winding motor 32, the output end of the winding motor 32 extends into the fixed seat 31 and is fixedly connected with the corresponding winding and unwinding wheel 33, both ends of the wrapping steel belt 4 are installed with an ear 41, and a hanging hole 42 for detachably hanging with the corresponding hook 35 is provided through the two ears 41, when the wrapping steel belt 4 wrapped around the pipeline is lowered to the support seat in the trench, the ear 41 is automatically separated from the corresponding hook 35, so that the wrapping steel belt 4 is conveniently taken out, the spacing adjusting assembly further comprises a fixed block 51 fixedly installed on two of the bases 1, one end of a lead screw 53 rotatably penetrates 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 with the end of the lead screw 53, a first blocking piece 55 that can be pressed against the fixed block 51 is fixedly sleeved on one end of the lead screw 53 close to the fixed block 51, and a second blocking piece 56 that can be pressed against the nut seat 52 is fixedly sleeved on one end of the lead screw 53 away from the fixed block 51, so that the nut seat 52 and the lead screw 53 are prevented from being separated.

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

[0049] Embodiment 4

[0050] Referring to Figs. 1-6 For the fourth embodiment of the present application, which is different from the third embodiment, a direct-buried pipeline laying construction method comprises trench excavation, foundation construction, pipeline laying, pipeline testing and laying backfilling;

[0051] S1, the trench excavation refers to that in the process of excavating the trench, the depth and width of the trench need to be determined according to the actual scheme of the construction, and the minimum excavation width of the bottom of the trench needs to be determined according to the actual situation of the construction site; secondly, before excavating the trench, the construction personnel need to survey the soil condition of the area to be excavated, so as to ensure the overall stability and strength of the soil foundation, in the case of large trench, mechanical excavation can be used, but it needs to be noted that when the difference between the excavated depth and the required depth is 20 cm, manual excavation is needed; finally, the construction personnel need to determine the amount of soil to be backfilled according to the actual size of the trench and the actual situation of the pipeline, and the excess soil is directly abandoned, so as to ensure the overall safety of the trench excavation;

[0052] S2, the foundation construction refers to according to the construction scheme, the earthwork is excavated to the required elevation, then the site needs to be leveled, and the waist pile is measured, in order to improve the overall bearing capacity of the foundation, it can be rammed, when the land bearing capacity reaches a certain degree, a layer of loess cushion is laid on the site, and the supervision engineer checks it, and lays a sand layer after the inspection is completed, so as to reduce the damage to the pipeline;

[0053] S3, pipeline laying refers to the hoisting and assembly of the pipeline;

[0054] S3.1, wherein the hoisting of the pipeline needs to adjust the placement position of the whole direct-buried pipeline laying device according to the length of the pipeline, first, the lifting lugs 41 at both ends of the wrapped steel belt 4 are hung on the corresponding hooks 35 respectively, then the servo motor 54 is started, the screw rod 53 is rotated, and the nut seat 52, that is, the corresponding machine seat 1 is linearly moved, because the base 11 at the bottom of the machine seat 1 is installed below the universal wheel 12, so the resistance of this step is small, so as to adjust the distance between the two wrapped steel belts 4, then the pipeline to be hoisted is placed on the two wrapped steel belts 4, because the wrapped steel belt 4 has the deformable characteristic, so it can be attached and wrapped around the pipeline with different outer diameter specifications, then the four machine seats 1 are pushed to the pipeline assembly station as a whole, and the two drive motors 21 are started, then the gear 22 is rotated, so as to mesh and drive the bent rod rack 23 to descend, then the ground plate 24 is pushed and pressed to touch the ground, realizing the fixation of the position of the four machine seats 1, accompanied by the driving of the drive motor 21, the rotating rod 25 and the fixed pulley 26 will also rotate synchronously, until the fixed pulley 26 is in relative rolling contact with the corresponding pull rope 34, and the distance between the two pull ropes 34 is adjusted to avoid the contact between the pull rope 34 and the inner wall of the groove, which affects the smooth laying of the pipeline, finally, the winding motor 32 is started to rotate the winding and unwinding wheel 33, then the pull rope 34 starts to unwind, so as to drive the hooks 35 and the wrapped steel belt 4 and the pipeline to descend, until the pipeline is placed in the groove, completing the hoisting of the pipeline;

[0055] S3.2, wherein the assembly of the pipeline refers to the determination of various parameters in the pipeline before the pipeline is connected, which meets the specific requirements of the construction drawing, and the position of the pipeline is determined again in order to ensure the tight connection of the pipe mouth. In general, the pipe mouth can be connected by butt welding, which can ensure the straightness of the pipeline and prevent the pipeline from deviating from the design position. The actual situation of welding needs to be determined according to the specific standard of welding, so as to ensure the overall quality of welding. According to the actual situation, the natural compensation device is selected, and the bending part is generally connected by welding instead of flange connection to ensure the sealing of the pipeline. For the heat pipeline, in order to reduce the thermal expansion and contraction phenomenon in the pipeline due to temperature, a corresponding compensator needs to be installed in each paragraph of the pipeline to make the stress in the pipeline meet the relevant requirements. When installing the compensation device, the center line of the compensator should be consistent with the center line of the pipeline;

[0056] S4, pipeline test refers to the water immersion of the pipeline in order to detect the welding quality and overall sealing degree of the pipeline, and the actual strength of the pipeline can be determined. Generally, the water immersion time should be maintained for more than 24 hours. During the immersion process, people need to observe the interface of the pipeline. During the pressure test of the pipeline, water flushing is usually used. Generally, the water pressure should be about 0.35MPa, and the actual water flushing time should be more than 12h. After two hours of water pressure test, if the pipeline still does not appear water seepage, it means that the strength of the pipeline can meet the relevant requirements.

[0057] S5, laying backfill refers to the backfill of the trench after the installation of the pipeline is completed. The main method of backfill is layering and tamping, which can ensure the overall strength of the soil above the pipeline. In addition, the backfill soil should not contain debris and bricks.

[0058] The remaining structure is the same as that of example 1.

[0059] The above examples are only used to illustrate the technical solutions of the present application, but not to limit them. Although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that they can modify the technical solutions described in the foregoing examples, or make equivalent replacement for part of the technical features; and these modifications or replacements will not make the essence of the corresponding technical solutions deviate from the protection scope of the technical solutions of the embodiments of the present application.

Claims

1. A direct buried pipeline laying device, comprising four rectangularly distributed machine bases (1) and a plurality of universal wheels (12) installed below the machine bases (1), characterized in that, Also include: Synchronous adjustment assembly, including one end rotatably mounted in the base (1), the other end extending out of the base (1) rotating rod (25), the rotating rod (25) extending out of the base (1) one end of the fixed pulley (26), the synchronous adjustment assembly also includes a lifting slide installed below the base (1) and the ground extrusion resistance of the grab board (24), the grab board (24) and rotating rod (25) synchronous motion, the lower bottom of the base (1) is fixedly installed on the base (11), the base (11) is provided with a groove for the lifting slide of the grab board (24), a plurality of said universal wheel (12) is respectively installed in the corresponding base (11) lower bottom of the four corners, the sidewall of the base (1) is provided with a storage cavity for the storage of rotating rod (25) and fixed pulley (26); The folding and unfolding assembly comprises a folding and unfolding wheel (33) rotatably arranged on the top of the plurality of bases (1), the folding and unfolding wheel (33) is wound with a pull rope (34) in rolling contact with the fixed pulley (26), and the end of the pull rope (34) is provided with a hook (35). The wrapped steel belt (4) is detachably hung between the corresponding two hooks (35). The spacing adjustment assembly comprises a lead screw (53) rotatably mounted on the two bases (1) on the same side, and further comprises a nut seat (52) threadedly mounted on the corresponding lead screw (53), and the two nut seats (52) are fixedly installed on the two bases (1) on the other side. The synchronous adjustment assembly further comprises a driving motor (21) fixedly installed on the base (1), the output end of the driving motor (21) extends into the corresponding base (1), and the gear (22) is fixedly installed, one side of the gear (22) is engaged with the bent bar rack (23), the bottom end of the bent bar rack (23) extends through the groove, and the grab board (24) is detachably installed, and the rotating rod (25) is vertically fixedly installed on the output end of the driving motor (21).

2. A direct buried pipe laying apparatus according to claim 1, wherein The folding and unfolding assembly further comprises a fixed seat (31) fixedly installed on the top of the corresponding base (1), and the outer sidewall of the fixed seat (31) is fixedly installed with a winding motor (32), and the output end of the winding motor (32) extends into the fixed seat (31) and is fixedly connected with the corresponding folding and unfolding wheel (33).

3. A direct buried pipe laying apparatus according to claim 2, wherein, The two ends of the wrapped steel belt (4) are provided with lifting lugs (41), and the lifting lugs (41) are provided with lifting holes (42) for detachable hanging with the corresponding hooks (35).

4. A direct buried pipe laying apparatus according to claim 3, wherein The spacing adjustment assembly further comprises a fixed block (51) fixedly installed on two of the bases (1), one end of the lead screw (53) rotatably extends through the fixed block (51), and the fixed block (51) is fixedly installed on one side of the servo motor (54), and the output end of the servo motor (54) is fixedly connected with the end of the lead screw (53).

5. A direct buried pipe laying apparatus according to claim 4, wherein The screw rod (53) is fixedly sleeved with a first baffle (55) capable of being pressed against the fixed block (51) at one end close to the fixed block (51), and is fixedly sleeved with a second baffle (56) capable of being pressed against the nut seat (52) at one end away from the fixed block (51).

6. A method of installing a direct buried pipe laying apparatus according to claim 5, wherein It includes trench excavation, foundation construction, pipeline laying, pipeline testing and backfilling; S1, the trench excavation refers to determining the depth and width of the trench according to the actual scheme of construction, and determining the minimum excavation width of the trench bottom according to the actual situation of the construction site; secondly, before excavating the trench, the construction personnel need to survey the soil condition of the area to be excavated, so as to ensure the overall stability and strength of the soil foundation; S2, the foundation construction refers to leveling the site after excavating the earthwork to the required elevation according to the construction scheme, and measuring the waist pile, when the land bearing capacity reaches a certain degree, a layer of loess cushion is laid on the site, and the supervision engineer checks it, and then a layer of sand soil is laid to reduce the damage to the pipeline; S3, the pipeline laying refers to hoisting and assembling the pipeline; S3.1, the hoisting of the pipeline needs to adjust the placement position of the whole direct-buried pipeline laying device according to the length of the pipeline, first, hang the lifting lugs (41) at both ends of the wrapped steel belt (4) on the corresponding hooks (35), then start the servo motor (54) to drive the screw rod (53) to rotate, and then drive the nut seat (52), that is, the corresponding machine seat (1) to move linearly, because the base (11) at the bottom of the machine seat (1) is installed below the universal wheel (12), the distance between the two wrapped steel belts (4) is adjusted, then the pipeline to be hoisted is placed on the two wrapped steel belts (4), the wrapped steel belt (4) can be attached to the pipeline with different outer diameter specifications, then the four machine seats (1) are pushed to the pipeline assembly station as a whole, and the two drive motors (21) are started, then the gear (22) is rotated to drive the bent rod rack (23) to descend, then the ground plate (24) is pushed to press against the ground, the position of the four machine seats (1) is fixed, accompanied by the driving of the drive motor (21), the rotating rod (25) and the fixed pulley (26) are also rotated synchronously, until the fixed pulley (26) is in relative rolling contact with the corresponding pull rope (34), and the distance between the two pull ropes (34) is adjusted, finally the winding motor (32) is started to drive the winding and unwinding wheel (33) to rotate, then the pull rope (34) starts to pay off, then the hook (35) and the wrapped steel belt (4) and the pipeline descend, until the pipeline is placed in the trench, the hoisting of the pipeline is completed. S3.2, wherein the assembly of the pipeline refers to the determination of various parameters in the pipeline before the connection of the pipeline, which meets the specific requirements of the construction drawing, and the position of the pipeline is determined again, in order to ensure the tight connection of the pipe, the way of butt welding can be used to connect the pipe, which can ensure the straightness of the pipeline, and the problem of deviation of the pipeline from the design position will not appear, the actual situation of welding needs to be determined according to the specific standard of welding, so as to ensure the overall quality of welding; According to the actual situation, choose natural compensation device, the bending part in which is connected by welding to ensure the sealing of the pipeline; for heat pipe, in order to reduce the thermal expansion and contraction phenomenon in the pipeline due to temperature, the corresponding compensator needs to be installed in each paragraph of the pipeline, so as to make the stress in the pipeline meet the relevant requirements. When installing the compensation device, the center line of the compensator should be consistent with the center line of the pipeline; S4, the pipeline test refers to the water immersion of the pipeline, the water immersion time should be kept for more than 24 hours, and people need to observe the interface of the pipeline during the immersion process. During the pressure test of the pipeline, the water flushing method is usually used, and the water pressure should be about 0.35MPa in general. The actual time of water flushing should be more than 12h. After two hours of water pressure test, the pipeline still does not appear water seepage phenomenon, which shows that the strength of the pipeline can meet the relevant requirements; S5, the laying backfill refers to the backfill of the trench after the installation of the pipeline is completed, the backfill method is layer compaction, and the earthwork of backfill cannot contain gravel and brick.

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