Testing device for measuring friction force of pipe soil

Abstract

The utility model discloses a testing device for measuring friction force of pipe soil, and belongs to the technical field of pipeline measurement. The device comprises a test pipeline and a test box, the test pipeline is movably installed in the test box, one end of the test pipeline is sequentially connected with a tension meter and a warping winch through a flange plate and a mooring rope, a soil pressure meter is installed on the test pipeline, and a water filling cover plate is arranged on the test box. A loading reaction frame and a hydraulic loading device are mounted on the test box, and the pressure sensor, the warping winch and the hydraulic loading device are all connected with the central control equipment through electrical cables. During experimental research, the pipe-soil friction force measuring device can realize pipe-soil friction force measuring experiments which are loaded in two directions and are integrally controlled by different pipes, different soil bodies, different soil burying depths and different underground water heights, and different influence factors can be researched in the same testing device, so that the friction force under different factors can be intuitively obtained; operation is convenient, and multiple experiments can be conveniently carried out.

Description

TECHNICAL FIELD

[0001] The utility model relates to pipeline measurement technical field, concretely is a kind of test device of measuring pipe soil friction. BACKGROUND

[0002] With the rapid development of China's social economy, the population and water consumption of China's city are rising, and the demand for water delivery project is gradually increasing. In order to meet the growing water needs of China's city, China has implemented more and more water delivery projects, therefore, it is particularly important to do well the research work of water delivery pipeline, especially the research on the relationship between pipeline and soil.

[0003] A kind of test device of measuring pipe soil friction is a professional equipment for measuring the interaction force between buried pipeline and surrounding soil, which has important significance in engineering design, geological exploration, soil mechanics and other fields, and can help researchers and engineers to deeply understand the interaction relationship between pipeline and soil, provide data support for the structural design and safety protection of pipeline, the basic working principle of a kind of test device of measuring pipe soil friction is to apply a known normal force (i.e. positive pressure) on the contact surface between pipeline and soil, then measure the friction generated during relative movement or attempted relative movement, the device usually includes loading system, sensor, driving system and data acquisition and analysis system and other key components.

[0004] In the prior art, when studying the friction between pipeline and soil, there are many factors affecting pipeline friction, and in the existing research experiment, a single experiment is generally carried out on multiple influencing factors, and then the experimental results are integrated, but this detection research method is not only cumbersome, but also has relatively large error in experiment, which will lead to large difference between the final experimental data and the actual situation.

[0005] Therefore, the present application provides a kind of test device of measuring pipe soil friction. UTILITY MODEL CONTENT

[0006] The utility model aims at providing a kind of test device of measuring pipe soil friction to solve the problems in the above background.

[0007] To achieve the above object, the utility model provides the following technical scheme: a kind of test device of measuring pipe soil friction, including test pipeline and test box, the test pipeline is movably installed in test box, one end of the test pipeline is installed with flange, and the flange is connected with tension measuring meter, the tension measuring meter is installed with cable, the cable is wound with winch, the test box is equipped with water filling cover plate, the tension measuring meter is adapted with central control equipment, and the winch is connected with central control equipment by electric cable;

[0008] The test box is provided with a loading counterforce frame, a hydraulic loading device movably arranged on the loading counterforce frame, and a pressure sensor arranged on one end of the hydraulic loading device, the pressure sensor being arranged on a reinforcing rib, the pressure sensor being adapted to a central control device, and the hydraulic loading device being connected to the central control device through an electric cable.

[0009] Preferably, vertical plates are hingedly arranged on both side edges of the test box, and a loading plate is hingedly arranged on the vertical plates, the loading plate being provided with reinforcing ribs of any cross-sectional form.

[0010] Preferably, a soil pressure gauge is arranged on the test pipe, the soil pressure gauge being adapted to the central control device.

[0011] Preferably, a chain is arranged on the loading counterforce frame, the chain being arranged on the hydraulic loading device.

[0012] Compared with the prior art, the utility model has the beneficial effects that:

[0013] In the experimental research, the test pipe, the test box and the central control device can realize the pipe-soil friction force measurement experiment of the two-direction loading of the integrated control of different pipes, different soil bodies, different buried soil depths and different underground water heights, different influencing factors can be researched in the same test device, the friction force under different factors can be directly obtained, and the operation is convenient and the experiment can be conveniently performed multiple times. BRIEF DESCRIPTION OF DRAWINGS

[0014] Figure 1 It is a main structure schematic view of the utility model;

[0015] Figure 2 It is a sectional plan structure schematic view of the utility model;

[0016] Figure 3 It is a schematic view of the directional moving plate of the utility model;

[0017] Figure 4 It is a schematic view of the loading counterforce frame of the utility model;

[0018] In the drawing: 1, test pipe; 2, test box; 3, central control device; 4, water filling cover plate; 5, soil pressure gauge; 6, flange plate; 7, winch; 8, cable; 9, tension gauge; 10, hydraulic loading device; 11, pressure sensor; 12, loading counterforce frame; 13, chain; 14, hinge; 15, loading plate; 16, reinforcing rib; 17, vertical plate. DETAILED DESCRIPTION

[0019] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be described clearly and completely. Obviously, the described embodiments are only some of the embodiments of the present application, but not all the embodiments. Based on the embodiments of the present application, all the other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present application.

[0020] Embodiment 1: Please refer to Figures 1-4 The utility model provides a technical scheme: a test device for measuring pipe soil friction, which comprises a test pipe 1 and a test box 2, the test pipe 1 is movably installed in the test box 2, a flange plate 6 is installed on one end of the test pipe 1, a tension measuring meter 9 is connected to the flange plate 6, a cable 8 is installed on the tension measuring meter 9, a winch 7 is wound on the cable 8, a water filling cover plate 4 is arranged on the test box 2, the tension measuring meter 9 is adapted to a central control device 3, the winch 7 is connected to the central control device 3 through an electric cable, the test box 2 is a six-surface box body, which comprises a bottom plate, a top plate with the water filling cover plate 4, two adjacent side plates, one of which is closed and the other of which has an aperture, and two other side plates, which are directional moving plates, i.e. a loading plate 15 that moves directionally in the loading process by the rotation of hinges 14 and vertical plates 17 on both sides of the plate, the water filling cover plate 4 on the top plate of the test box 2 can simulate different groundwater levels by injecting different amounts of water, and the pipe soil friction measurement experiment under different groundwater levels can be carried out, the flange plate 6 is fixed on one end of the test pipe 1, and the test pipe 1 is convenient to connect with the winch 7.

[0021] A loading counterforce frame 12 is installed on the test box 2, a hydraulic loading device 10 is movably installed on the loading counterforce frame 12, a pressure sensor 11 is installed on one end of the hydraulic loading device 10, the pressure sensor 11 is installed on a reinforcing rib 16, the pressure sensor 11 is adapted to the central control device 3, the hydraulic loading device 10 is connected to the central control device 3 through an electric cable, the directional moving plates in two directions and the loading device can apply different sizes of thrust to the soil in the box in two directions, the soil pressure measuring meters 5 can be arranged at different positions on the surface of the test pipe 1, the situation that the test pipe 1 is subjected to different sizes of thrust in two directions to generate pipe circumference pressure is simulated, the loading counterforce frame 12 provides a counterforce for the hydraulic loading device 10 in the loading process, and the loading plate 15 has a plurality of reinforcing ribs 16 in horizontal and vertical directions, so that the rigidity of the loading plate 15 meets the requirements of the experiment.

[0022] Further, the test pipe 1 is provided with a soil pressure gauge 5, which is matched with the central control device 3. The central control device 3 integrates the functions of controlling the switch and winding speed of the winch 7, the switch and loading speed of the hydraulic loading device 10, so as to quickly and accurately control the winding speed, loading speed and force during the experiment. Meanwhile, the central control device 3 can collect, store, process and display the measurement data of the tension gauge 9, the soil pressure gauge 5 and the pressure sensor 11, so as to read the pipe-soil friction, the pipe circumference pressure and the loading force, and transmit the measurement data to the central control device 3.

[0023] Further, the vertical plate 17 is provided on the two side edges of the test box 2 through the hinges 14, the loading plate 15 is provided on the vertical plate 17 through the hinges 14, the loading plate 15 is provided with the reinforcing ribs 16 of any cross-sectional form, the loading plate 15 is connected with the vertical plate 17 through the hinges, and the vertical plate 17 is fixed on the frame of the test box 2 through the hinges 14, so as to ensure that the loading plate 15 is always perpendicular to the bottom plate of the test box 2, and ensure that the loading plate 15 always moves horizontally along the pressure direction, thereby avoiding the overturning of the loading plate 15 due to eccentric pressure during the loading process. The loading plate 15 and the vertical plate 17 form a closed side plate of the test box 2, so as to avoid the overflow of the soil and water along the side plate during the loading process.

[0024] Further, the chain 13 is provided on the loading reaction frame 12, and the chain 13 is provided on the hydraulic loading device 10. The hydraulic loading device 10 can adjust the height of the loading point through the chain 13, and the pipe-soil friction measurement experiment can be repeatedly carried out for different buried depths.

[0025] The working principle is as follows: (1) one end of the test pipe 1 is connected with the flange plate 6, the cable 8 of the winch 7 is connected with the tension gauge 9, and then the tension gauge 9 is connected with the flange plate 6. The other end of the test pipe 1 is covered with a pipe cap. The test pipe 1 should always be kept horizontal before and during the loading process. The center of the test pipe 1, the tension gauge 9 and the center of the cable 8 should always be kept on the same horizontal straight line.

[0026] (2) the soil pressure gauge 5 is pasted on the surface of the test pipe 1. The device supports arranging a plurality of soil pressure gauges 5 at different positions on the surface of the test pipe 1, so as to simulate the pipe circumference pressure generated by the test pipe 1 under different sizes of thrust in two directions;

[0027] (3) the test pipe 1 is placed in the hole of the test box 2, and the soil is filled in the test box 2 layer by layer until the experimental requirements are met. The required water amount is injected at the water filling cover plate 4, so as to simulate the underground water of the test pipe 1.

[0028] (4) according to the depth of the soil and the height of the water injection, by adjusting the length of the chain 13 on the loading reaction frame 12, the hydraulic loading device 10 is always perpendicular to the loading plate 15 before loading and during loading, and the loading point is always acting on the reinforcing rib 16, the height of the loading point should meet the experimental requirements, and the pressure sensor 11 is fixed in front of the hydraulic loading device 10;

[0029] (5) the two side plates of the test box 2 are loading plates 15 constrained by hinges 14, and the loading plates 15 are provided with horizontal and vertical reinforcing ribs 16, and the loading plates 15 and the vertical plates 17 are connected with the frame of the test box 2 through the hinges 14, and the loading plates 15 and the vertical plates 17 should be always perpendicular to the bottom plate of the test box 2 before loading and during loading;

[0030] (6) the central control device 3 starts the winch 7 and the hydraulic loading device 10, controls the loading speed of the two hydraulic loading devices 10 respectively, and collects the loading force data through the pressure sensor 11 in front of the hydraulic loading device 10;

[0031] (7) the value of the soil pressure measuring gauge 5 is observed, under the loading of the hydraulic loading device 10, when the value of the soil pressure measuring gauge 5 meets the experimental requirements, the hydraulic loading device 10 is stably maintained at the current loading force, and the value of the soil pressure measuring gauge 5 is read as the size of the pipe surrounding pressure;

[0032] (8) the central control device 3 controls the winding speed of the winch 7, the value of the tension measuring gauge 9 is observed, the winding speed is adjusted to make the tension measuring gauge 9 stably maintain at a fixed value, and the value of the tension measuring gauge 9 is read as the size of the pipe-soil friction.

[0033] Although the embodiments of the utility model have been shown and described, it can be understood by those skilled in the art that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and spirits of the utility model, and the scope of the utility model is defined by the appended claims and their equivalents.

Claims

1. A test device for measuring the frictional force between a pipe and soil, characterized in that: The test includes a test pipe (1) and a test chamber (2). The test pipe (1) is movably installed inside the test chamber (2). A flange (6) is installed on one end of the test pipe (1). A tensile measuring instrument (9) is connected to the flange (6). A cable (8) is installed on the tensile measuring instrument (9). A cable winch (7) is wound on the cable (8). A water-filled cover (4) is provided on the test chamber (2). The tensile measuring instrument (9) is compatible with the central control equipment (3). The cable winch (7) is connected to the central control equipment (3) via an electrical cable. The test chamber (2) is equipped with a loading reaction frame (12), and a hydraulic loading device (10) is movably installed on the loading reaction frame (12). A pressure sensor (11) is installed on one end of the hydraulic loading device (10). The pressure sensor (11) is installed on the reinforcing rib (16). The pressure sensor (11) is compatible with the central control device (3). The hydraulic loading device (10) and the central control device (3) are connected by an electrical cable.

2. The test device for measuring soil-tube friction according to claim 1, characterized in that: Vertical plates (17) are mounted on both sides of the test chamber (2) via hinges (14), and loading plates (15) are mounted on the vertical plates (17) via hinges (14). Reinforcing ribs (16) of any cross-sectional shape are arranged on the loading plates (15).

3. The test device for measuring soil-tube friction according to claim 1, characterized in that: The test pipeline (1) is equipped with a soil pressure gauge (5), which is compatible with the central control equipment (3).

4. The test device for measuring soil-tube friction according to claim 1, characterized in that: A chain (13) is installed on the loading reaction frame (12), and the chain (13) is installed on the hydraulic loading device (10).

Images