Device and method for testing friction coefficient between buried pipeline and soil

Abstract

The present application relates to the technical field of pipeline construction, and provides a device and method for testing the friction coefficient between a buried pipeline and soil. The device for testing the friction coefficient between a buried pipeline and soil comprises a simulation pipeline, a test box, a traction support, a driving mechanism and a tension detection mechanism. The traction support is horizontally and slidingly connected to the test box. The driving mechanism is connected to the traction support and is used to drive the traction support to slide at a constant speed. The tension detection mechanism is arranged on the traction support. The detection end of the tension detection mechanism is connected to the simulation pipeline. The tension detection mechanism is used to detect the tension when the simulation pipeline is moved. The device and method for testing the friction coefficient between a buried pipeline and soil can simulate the friction between the pipeline and soil, and can simulate the friction between the pipeline and soil under different drag reduction conditions. The device and method can truly reflect the friction between the pipe material and the soil layer during pipe jacking, so as to more accurately estimate the jacking force.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of pipeline construction, and in particular to a device and method for testing the friction coefficient between a buried pipeline and soil. BACKGROUND

[0002] Pipe jacking is a common method for laying underground pipelines in cities, and has the advantages of fast construction speed, no impact on traffic, and little impact on the surrounding environment. It is now widely used in fields such as water supply and drainage engineering, communication engineering, and oil and gas engineering.

[0003] The jacking resistance of a pipe jacking increases with the increase of the jacking distance, which is a key problem that limits the jacking length of the pipe. Therefore, the usual solution is to inject drag-reducing mud between the pipeline and the soil layer, which converts the dry friction between the pipeline and the soil into wet friction, thereby greatly reducing the friction resistance and the jacking force. Another method is to perform pipe joint wax melting, which can reduce the friction coefficient between the pipeline and the soil.

[0004] Currently, the friction coefficient between the pipeline and the soil layer is usually estimated based on past engineering experience and relevant standards. However, the friction coefficient obtained in this way often cannot accurately reflect the real situation of the pipeline-soil friction, leading to overestimation or underestimation of the pipe jacking force, resulting in waste of manpower and materials or causing engineering safety accidents. SUMMARY

[0005] The present application provides a device and method for testing the friction coefficient between a buried pipeline and soil, which solves the problem that the friction coefficient between the pipeline and the soil layer cannot accurately reflect the real situation of the pipeline-soil friction based on past engineering experience and relevant standards in the prior art.

[0006] The present application provides a device for testing the friction coefficient between a buried pipeline and soil, comprising:

[0007] a simulation pipeline;

[0008] a test box, the upper side of the test box being provided with a test port;

[0009] a traction support, which is horizontally and slidingly connected to the test box;

[0010] a driving mechanism, which is connected to the traction support and is used to drive the traction support to slide at a constant speed; and

[0011] a tension detection mechanism, which is provided on the traction support, the detection end of the tension detection mechanism being connected to the simulation pipeline, and the tension detection mechanism being used to detect the tension when the simulation pipeline is pulled to move.

[0012] The application provides a device for testing the friction coefficient between a buried pipeline and soil.

[0013] The transmission assembly comprises a winding drum and a first traction rope, one end of the first traction rope is wound around the winding drum, and the other end is fixedly connected with the traction support.

[0014] Alternatively, the transmission assembly comprises a transmission screw rod and a transmission screw nut, the transmission screw rod is coaxially fixed with the rotating shaft of the driving motor, the transmission screw nut is threadedly connected with the transmission screw rod and fixedly connected with the traction support.

[0015] The tension detection mechanism comprises a dynamometer and a second traction rope, the dynamometer is fixedly connected with the traction support, one end of the second traction rope is connected with the dynamometer, and the other end is connected with the simulated pipeline.

[0016] The simulated pipeline comprises a pipeline body and a traction frame arranged on the pipeline body, the traction frame is coaxial with the pipeline body, and the end of the second traction rope away from the dynamometer is connected with the center position of the traction frame.

[0017] The simulated pipeline further comprises a scratch-proof end plate, the scratch-proof end plate is arranged at one end of the pipeline body close to the tension detection mechanism, and the scratch-proof end plate is gradually curved towards the direction close to the axis of the pipeline body from one end connected with the pipeline body to the end away from the pipeline body.

[0018] The traction support is arranged across the detection opening, and the traction support is provided with sliding connecting pieces for sliding connection with the test box at two ends.

[0019] The device for testing the friction coefficient between a buried pipeline and soil further comprises:

[0020] A leveling mechanism is arranged for leveling the upper surface of the soil in the test box and making the thickness of the soil reach a preset value.

[0021] The device for testing the friction coefficient between a buried pipeline and soil further comprises:

[0022] A height adjusting mechanism is connected to the traction support and the tension detection mechanism, and is used to adjust the supporting height of the traction support to the tension detection mechanism.

[0023] The application further provides a test method of the test device for the friction coefficient between the buried pipeline and the soil body.

[0024] S100, filling the stratum soil body of the pipe jacking application site into the test box, and making the soil body surface flat;

[0025] S200, driving the traction support to slide at a constant speed by driving the driving mechanism, so as to drag the simulation pipeline to slide horizontally and axially at a constant speed, and detecting the tension value by the tension detection mechanism;

[0026] S300, uniformly laying the drag reduction mud on the soil body surface in the test box, and repeating step S200;

[0027] S400, uniformly melting the wax on the surface of the simulation pipeline, and repeating steps S100 to S300;

[0028] S500, taking the tension value detected by the tension detection mechanism as the friction force between the pipeline and the soil body under different drag reduction conditions, calculating the ratio of the friction force under different drag reduction conditions to the weight of the model pipeline, and obtaining the friction coefficient between the pipeline and the soil body under different drag reduction conditions.

[0029] The test device and the test method for the friction coefficient between the buried pipeline and the soil body can realize the simulation test of the friction condition between the pipeline and the soil body, and can realize the simulation test of the friction condition between the pipeline and the soil body under different drag reduction conditions by laying the drag reduction mud on the soil body surface or melting the wax on the surface of the simulation pipeline, and can truly reflect the friction condition between the pipe material of the pipe jacking and the stratum soil body, so that the jacking force can be more accurately estimated. BRIEF DESCRIPTION OF DRAWINGS

[0030] In order to more clearly illustrate the technical solutions 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 some embodiments of the application, and for those skilled in the art, other drawings can also be obtained without creative labor.

[0031] Figure 1 is a whole structure schematic view of a test device for the friction coefficient between the buried pipeline and the soil body provided by the application;

[0032] 100, test chamber; 110, support plate; 200, traction support; 210, sliding piece; 300, force meter; 400, first traction rope; 500, second traction rope; 600, simulated pipeline; 610, traction frame; 700, driving motor; 800, winding drum. DETAILED DESCRIPTION

[0033] The embodiments of the present application will be further described below in conjunction with the drawings and examples. The following examples are used to illustrate the present application, but cannot be used to limit the scope of the present application.

[0034] In the description of the embodiments of the present application, it should be noted that the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only used to facilitate the description of the embodiments of the present application and simplify the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the embodiments of the present application. In addition, the terms "first", "second", "third" are only for descriptive purposes and cannot be understood as indicating or implying relative importance.

[0035] In the description of the embodiments of the present application, it should be noted that unless otherwise explicitly specified and limited, the terms "connected", "connected" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or it can be integrally connected; it can be mechanically connected, or it can be electrically connected; it can be directly connected, or it can be indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0036] In the embodiments of the present application, unless otherwise explicitly specified and limited, the first feature is "on" or "under" the second feature, which can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature "above", "above" and "above" the second feature can be that the first feature is directly above or obliquely above the second feature, or it can only mean that the horizontal height of the first feature is higher than that of the second feature. The first feature "below", "below" and "below" the second feature can be that the first feature is directly below or obliquely below the second feature, or it can only mean that the horizontal height of the first feature is less than that of the second feature.

[0037] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of the present invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0038] The following is combined with Figure 1 The device for testing the friction coefficient between a buried pipeline and soil according to an embodiment of the present invention includes a simulated pipeline 600, a test chamber 100, a traction support 200, a drive mechanism, and a tensile testing mechanism. A test port is provided on the upper side of the test chamber 100. The traction support 200 is horizontally slidably connected to the test chamber 100. The drive mechanism is connected to the traction support 200 and is used to drive the traction support 200 to slide at a uniform speed. The tensile testing mechanism is disposed on the traction support 200. The detection end of the tensile testing mechanism is connected to the simulated pipeline 600. The tensile testing mechanism is used to detect the tensile force when the simulated pipeline 600 is moved.

[0039] Since the coefficient of friction between two objects depends on the properties of the materials, the coefficient of friction during pipe jacking depends on the properties of the concrete pipe and the grout. To ensure that the model test accurately reflects the prototype, according to the principle of similarity, the geometric features and physical quantities between the model and the prototype must satisfy certain rules; that is, the geometric dimensions, material, and load of the model must maintain a certain proportional relationship.

[0040] After injecting bentonite thixotropic mud into the outer surface of the concrete jacking pipe, if a good mud sleeve can be formed, the dry friction between the jacking pipe and the soil becomes wet friction between the jacking pipe and the mud. The lower part of the pipe is in contact with the soil or mud-slurry mixture; therefore, it is only necessary to calculate the frictional resistance between the lower part of the pipe and the soil or mud-slurry mixture. The classic formula for frictional resistance is used here.

[0041] F f =F N μ Formula 1

[0042] In the formula, F f The frictional resistance experienced by the pipeline from the soil or slurry mixture;

[0043] F N It is the supporting force of soil or slurry mixture on the pipeline, which is numerically equal to the self-weight of the pipeline;

[0044] μ is the friction coefficient of the contact surface between the pipeline and the soil or the slurry mixture.

[0045] Based on the above principle, the buried pipeline and soil friction coefficient testing device in the embodiment of the application simulates the friction properties between different soil layers under different drag reduction methods, different pipeline materials and different soil layers, so as to obtain accurate and reliable friction coefficients and provide a basis for pipe jacking force calculation.

[0046] Optionally, the simulation pipeline 600 in the embodiment of the application is a concrete pipeline with a diameter of 200 mm and a length of 200-300 mm.

[0047] Optionally, the test box 100 in the embodiment of the application is a rectangular box structure with a length of 600 mm, a width of 400 mm and a height of 200 mm. The test port is located on the upper side of the test box 100, and the same soil layer sample or drag reduction slurry as the pipe jacking project crossing the soil layer can be filled into the test box 100 through the test port. The simulation pipeline 600 is suitable for sliding at the test port position.

[0048] According to the buried pipeline and soil friction coefficient testing device in the embodiment of the application, the driving mechanism includes a driving motor 700 and a transmission assembly. The driving motor 700 is a constant speed motor, which is connected with the traction support 200 through the transmission assembly.

[0049] Optionally, the top of the test box 100 is provided with a support plate 110, which is horizontally arranged and fixedly connected with the test box 100 at both ends. The driving motor 700 is fixed on the support plate 110 by bolts.

[0050] In an optional scheme, the transmission assembly includes a winding drum 800 and a first traction rope 400. The winding drum 800 is fixedly arranged on the rotating shaft of the driving motor 700. The winding drum 800 can adopt an I-shaped wheel structure, and the axial direction thereof is perpendicular to the sliding direction of the traction support 200. One end of the first traction rope 400 is wound around the winding drum 800, and the other end is fixedly connected with the traction support 200. When the driving motor 700 operates, the winding drum 800 can be axially rotated, and the traction support 200 can be pulled to slide by winding the first traction rope 400 on the winding drum 800.

[0051] In another optional scheme, the transmission assembly includes a transmission screw and a transmission nut. The transmission screw is coaxially fixed with the rotating shaft of the driving motor 700, and the transmission nut is threadedly connected with the transmission screw and fixedly connected with the traction support 200. When the driving motor 700 operates, the transmission screw can be axially rotated. At this time, the transmission nut moves along the axial direction of the transmission screw, and in turn drives the traction support 200 to slide. In this scheme, the driving motor 700 can drive the traction support 200 to reset when it reversely rotates.

[0052] Optionally, the transmission screw is rotatably connected to the support plate 110 through a bearing seat, which can support the transmission screw to make the rotation of the transmission screw more stable.

[0053] According to the buried pipeline and soil friction coefficient testing device, the traction bracket 200 is arranged across the detection opening, and the two ends of the traction bracket 200 are respectively provided with sliding connecting pieces 210 used for sliding connection with the test box 100, and the sliding direction of the traction bracket 200 is along the length direction of the test box 100.

[0054] In an optional solution, the sliding connecting piece 210 is a roller structure, the sliding connecting piece 210 is rotatably connected to the lower side of the traction bracket 200, the upper side of the side plate of the test box 100 is provided with a support rod used for supporting the sliding connecting piece 210, and the sliding connecting piece 210 can roll along the support rod.

[0055] Optionally, the two ends of the traction bracket 200 are respectively provided with at least two sliding connecting pieces 210, and the sliding connecting pieces 210 located at the same end of the traction bracket 200 are horizontally and spaced apart along the sliding direction of the traction bracket 200.

[0056] Optionally, a ring groove is arranged on the wheel surface of the sliding connecting piece 210, and the upper end of the support rod is located in the ring groove.

[0057] In another optional solution, the sliding connecting piece 210 includes a sliding rail and a sliding block, the sliding rail is horizontally arranged on the outer side of the test box 100, and the sliding block is slidingly connected with the sliding rail. The traction bracket 200 is a door-type bracket structure, the lower end of the vertical plate thereof is fixedly connected with the corresponding sliding block, and the horizontal plate thereof is located on the upper side of the test box 100.

[0058] In some embodiments of the present application, the buried pipeline and soil friction coefficient testing device further includes a leveling mechanism, which is used for leveling the upper surface of the soil in the test box 100 and making the thickness of the soil reach a preset value.

[0059] Optionally, the leveling mechanism includes a scraper, the length direction of the scraper is along the width direction of the test box 100, and an included angle is formed between the width direction of the scraper and the horizontal plane, which can be 90° or 60°, and the like, which is not limited herein. The scraper is connected with the traction bracket 200 and is adapted to slide horizontally with the traction bracket 200.

[0060] Optionally, the leveling mechanism further includes an adjusting assembly, which is connected with the traction bracket 200 and the scraper and is adapted to adjust the height of the scraper.

[0061] Optionally, the adjusting assembly includes a sliding rod and an adjusting bolt, the sliding rod is fixedly connected with the scraper and is vertically slidingly connected with the traction bracket 200, the adjusting bolt is vertically arranged and is threadedly connected with the traction bracket 200, the bottom end of the adjusting bolt is rotatably connected with the scraper, and the top end of the adjusting bolt is provided with a hand wheel, and the height of the scraper can be adjusted by rotating the hand wheel.

[0062] According to the buried pipeline and soil friction coefficient testing device, the tension detection mechanism comprises a force meter 300 and a second traction rope 500, the force meter 300 is fixedly connected to the traction support 200, one end of the second traction rope 500 is connected to the force meter 300, and the other end of the second traction rope 500 is connected to the simulated pipeline 600. When the traction support 200 moves, the simulated pipeline 600 can slide horizontally by the force meter 300 and the second traction rope 500. It can be understood that when the driving mechanism drives the traction support 200 to slide at a constant speed and the measured value of the force meter 300 is stable, the simulated pipeline 600 also slides at a constant speed, and at this time, the measured value of the force meter 300 is the friction resistance value borne by the simulated pipeline 600, and the contact surface friction coefficient of the pipeline and the soil or the slurry mixture can be calculated by formula 1.

[0063] According to the buried pipeline and soil friction coefficient testing device, the simulated pipeline 600 comprises a pipeline body and a traction frame 610 arranged on the pipeline body, the traction frame 610 is coaxial with the pipeline body, and the end, away from the force meter 300, of the second traction rope 500 is connected to the center position of the traction frame 610.

[0064] Optionally, the traction frame 610 is a cross-screw structure, and the traction frame 610 is fixedly arranged at the end of the pipeline body.

[0065] Optionally, the two ends of the pipeline body are respectively provided with the traction frame 610, and the second traction rope 500 is connected to the traction frame 610 at the end of the pipeline body close to the force meter 300. By arranging the traction frame 610 at the two ends of the pipeline body respectively, the weight of the two ends of the pipeline body can be balanced, so that the test result is more accurate. It should be noted that, in order to make the calculation result more accurate, the weight of the traction frame 610 should be included in the total weight of the pipeline body for calculating the friction coefficient.

[0066] Optionally, the simulated pipeline 600 further comprises a scratch-proof end plate, the scratch-proof end plate is arranged at the end of the pipeline body close to the tension detection mechanism, and the scratch-proof end plate is curved towards the axis of the pipeline body from one end connected to the pipeline body to the other end away from the pipeline body.

[0067] Optionally, the scratch-proof end plate is a ring structure coaxial with the pipeline body.

[0068] Further, the two ends of the pipeline body are respectively provided with the scratch-proof end plate.

[0069] It can be understood that the pipe body will sink a certain depth on the surface of the soil or the slurry mixture under the action of its own weight, and when the pipe body is moved horizontally, the end of the pipe body will push the soil or the slurry mixture in front, so that the soil or the slurry mixture forms a pile, and the resistance of the piled soil or the slurry mixture to the pipe body will affect the accuracy of the detection result. In the embodiment of the present application, the anti-scratching end plate is arranged to effectively prevent the soil or the slurry mixture from piling up at the front end of the pipe body, thereby effectively improving the accuracy of the detection result.

[0070] It can be further understood that, in order to make the calculation result more accurate, the weight of the anti-scratching end plate should also be included in the total weight of the pipe body for calculating the friction coefficient.

[0071] In some embodiments of the present application, the test device for the friction coefficient of the buried pipeline and the soil further comprises a height adjusting mechanism connected to the traction support 200 and the tension detection mechanism, and the height adjusting mechanism is used to adjust the support height of the traction support 200 to the tension detection mechanism.

[0072] Optionally, the height adjusting mechanism comprises an adjusting seat, a pair of guide rods, a mounting plate and a telescopic motor, the adjusting seat is fixedly arranged on the traction support 200, the pair of guide rods are vertically and slidably connected to the adjusting seat, the mounting plate is fixedly arranged at the top end of the pair of guide rods, the telescopic motor is fixedly connected with the mounting plate, and the dynamometer 300 is fixedly arranged on the upper side of the mounting plate.

[0073] In the above scheme, the height of the dynamometer 300 can be adjusted by the height adjusting mechanism, so as to facilitate the horizontal guarantee of the second traction rope 500 and prevent the external force applied by the second traction rope 500 to the simulated pipeline 600 from containing a vertical component, thereby avoiding errors in the detection result.

[0074] The embodiment of the present application also provides a test method for applying the test device for the friction coefficient of the buried pipeline and the soil, which comprises the following steps:

[0075] S100, filling the stratum soil of the pipe jacking application site into the test box 100, and making the soil surface flat. In this step, the amount of the stratum soil filled into the test box 100 should ensure that the tension detection mechanism can pull the simulated pipeline 600 to move horizontally, and the flatness of the soil surface should ensure that the soil surface is a horizontal plane.

[0076] S200, running the driving mechanism to drive the traction support 200 to slide at a constant speed, so as to pull the simulated pipeline 600 to slide at a constant speed in the horizontal axial direction, and detect the tension value by the tension detection mechanism.

[0077] S300, uniformly lay the drag-reducing mud on the surface of the soil in the test box 100, and repeat the step S200. The drag-reducing mud should also be laid in this step to ensure that the tension detection mechanism pulls the simulation pipeline 600 to move horizontally, and the upper surface of the drag-reducing mud is a horizontal plane.

[0078] S400, uniformly melt the wax on the surface of the simulation pipeline 600, and repeat the steps S100 to S300.

[0079] S500, the tension value obtained by the tension detection mechanism is taken as the friction between the pipeline and the soil under different drag-reducing conditions, the ratio of the friction under different drag-reducing conditions to the weight of the model pipeline is calculated to obtain the friction coefficient between the pipeline and the soil under different drag-reducing conditions.

[0080] Optionally, the weight of the simulation pipeline 600 is measured before the calculation of the friction coefficient, for example, the weight of the simulation pipeline 600 after the surface is melted with the wax should be taken as the reference when the friction coefficient of the simulation pipeline 600 with the surface uniformly melted with the wax is calculated.

[0081] Finally, it should be noted that: the above embodiments are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement for part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. A device for testing the coefficient of friction between a buried pipeline and the surrounding soil, characterized in that, The utility model relates to a kind of pipe-pulling simulation device, including: Simulation pipeline;The simulation pipeline includes pipeline body and is arranged in the traction frame of the pipeline body, and the traction frame is coaxial with the pipeline body; Test box, the test box upper side is provided with test port; Traction support, horizontal sliding connection is established in the test box; Driving mechanism, the traction support is connected, for driving the traction support uniform speed sliding; And Tension detection mechanism, it is arranged in the traction support, the detection end of the tension detection mechanism is connected the simulation pipeline, the tension detection mechanism is connected the center position of the traction frame, for detecting the tension when pulling the simulation pipeline moves; The simulation pipeline further includes scratchproof end plate, the scratchproof end plate is arranged in the pipeline body near the tension detection mechanism one end, the scratchproof end plate is gradually curved towards the direction close to the pipeline body axis from the one end connected with the pipeline body to the one end away from the pipeline body.

2. The apparatus for testing the friction coefficient between a buried pipe and soil according to claim 1, wherein The driving mechanism includes driving motor and transmission assembly, and the driving motor is connected with the traction support through the transmission assembly.

3. The apparatus for testing the friction coefficient between a buried pipeline and the soil according to claim 2, wherein, The transmission assembly includes reel and first traction rope, the reel is fixedly arranged on the rotating shaft of the driving motor, and one end of the first traction rope is wound on the reel, and the other end is fixedly connected with the traction support. Or, the transmission assembly includes transmission screw and transmission nut, the transmission screw is coaxially fixed with the rotating shaft of the driving motor, and the transmission nut is threadedly connected with the transmission screw and fixedly connected with the traction support.

4. The apparatus for testing the friction coefficient between a buried pipeline and the soil according to claim 1, wherein The tension detection mechanism includes dynamometer and second traction rope, the dynamometer is fixedly connected with the traction support, one end of the second traction rope is connected with the dynamometer, and the other end is connected with the simulation pipeline.

5. The apparatus for testing the friction coefficient between a buried pipeline and the soil according to claim 4, wherein The other end of the second traction rope away from the dynamometer is connected with the center position of the traction frame.

6. The apparatus for testing the coefficient of friction between a buried pipeline and the surrounding soil according to claim 1, wherein The traction support is arranged across the test port, and the traction support is provided with sliding connectors for sliding connection with the test box at both ends.

7. The apparatus for testing the friction coefficient between a buried pipeline and the soil according to claim 1, wherein, Further including: Leveling mechanism, the leveling mechanism is used for leveling the upper surface of the soil body in the test box, and the thickness of the soil body reaches the preset value.

8. The apparatus for testing the friction coefficient between a buried pipeline and the soil according to claim 1, wherein, Further including: Height adjusting mechanism, the height adjusting mechanism is connected with the traction support and the tension detection mechanism, and the height adjusting mechanism is used for adjusting the support height of the traction support to the tension detection mechanism.

9. A test method using the test device for the friction coefficient between a buried pipe and soil according to any one of claims 1 to 8, characterized by, Including: S100, the stratum soil of pipe-pulling application site is filled into the test box, and the soil surface is leveled; S200, the driving mechanism is operated to drive the traction support to slide uniformly, to drag the simulation pipeline to slide uniformly in horizontal axis direction, and the tension value is detected by the tension detection mechanism; S300, the soil surface in the test box is evenly laid with drag-reducing mud, and step S200 is repeated; S400, the simulation pipeline surface is evenly fused with wax, and steps S100 to S300 are repeated; S500, the tension value obtained by the tension detection mechanism is taken as the friction between the pipeline and the soil under different drag-reducing conditions, the ratio of the friction under different drag-reducing conditions to the weight of the model pipeline is calculated to obtain the friction coefficient between the pipeline and the soil under different drag-reducing conditions.

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