A device for testing the drag reduction effect of a thixotropic mud

Abstract

The application discloses a kind of thixotropic mud drag reduction effect testing devices, it is related to underground engineering testing technical field, to solve the problem of large error of pipe jacking engineering mud frictional resistance detection.The kind of thixotropic mud drag reduction effect testing device, including the bottom plate with guide rail, groove body being slidably arranged on the guide rail and motor being installed on the bottom plate, the groove body is filled with thixotropic mud, and concrete test block is placed on the thixotropic mud;The output shaft of the motor is installed with winding reel, the winding reel is wound with rope, and one end of the rope is connected to the end face of the groove body;The end face of the concrete test block deviating from the rope is connected with tension meter.

Description

Technical Field

[0001] This application relates to the field of underground engineering testing devices, and more particularly to a testing device for the drag reduction effect of thixotropic mud. Background Technology

[0002] With the rapid development of cities, pipe jacking, as one of the trenchless technologies for underground engineering, has been increasingly widely used in recent years. As a key technology in pipe jacking tunnel construction, thixotropic mud grouting for drag reduction plays a crucial role in the jacking process. Thixotropic mud, as an indispensable material, influences factors such as jacking friction during pipe jacking.

[0003] Currently, the testing device for the frictional resistance of slurry in pipe jacking projects usually places a concrete slider on the thixotropic slurry and measures the resistance of the thixotropic slurry by pulling the concrete slider with a spring tension gauge. This testing method requires manual pulling of the tension gauge throughout the process, and the uneven pulling speed leads to large errors in the test results. Furthermore, it cannot test the resistance of the thixotropic slurry at different speeds. Utility Model Content

[0004] The purpose of this application is to provide a thixotropic mud drag reduction effect testing device to improve testing accuracy.

[0005] To achieve the above objectives, this application provides the following technical solution:

[0006] A thixotropic mud drag reduction effect testing device includes: a base plate with a guide rail, a trough slidably mounted on the guide rail, and a motor mounted on the base plate. The trough is filled with thixotropic mud, and a concrete test block is placed on the thixotropic mud. A winding reel is mounted on the output shaft of the motor, and a rope is wound on the winding reel. One end of the rope is connected to the end face of the trough. A tension gauge is connected to the end face of the concrete test block opposite to the rope.

[0007] A further technical solution is that the motor is connected to a speed regulator for adjusting the motor speed.

[0008] A further technical solution is that a support frame is provided on the base plate, and a fixing mechanism for fixing the tension gauge is provided on the support frame.

[0009] A further technical solution is that the fixing mechanism includes a hook.

[0010] A further technical solution is that the fixing mechanism includes a baffle fixed on the support frame and a support plate disposed on the baffle. The baffle is perpendicular to the base plate, and a clearance hole is provided on the baffle. The support plate is parallel to the base plate.

[0011] Compared with the prior art, this application has the following beneficial effects:

[0012] By using a motor to move the tank evenly while keeping the handheld tension gauge stationary, the friction coefficient between the concrete test block and the thixotropic mud can be accurately measured. The stationary tension gauge is easy to read, avoiding uneven speed caused by manually dragging the tension gauge and reducing testing errors. Attached Figure Description

[0013] The accompanying drawings, which are included to provide a further understanding of this application and form part of this application, illustrate exemplary embodiments and are used to explain this application, but do not constitute an undue limitation of this application. In the drawings:

[0014] Figure 1 A top view of the overall structure provided in an embodiment of this application;

[0015] Figure 2 A partial structural schematic diagram is provided for one embodiment of this application;

[0016] Figure 3 This is a schematic diagram of another partial structure provided for one embodiment of this application.

[0017] Reference numerals: 1. Base plate; 11. Guide rail; 2. Motor; 21. Winding reel; 22. Rope; 3. Trench; 4. Concrete test block; 41. Tensile gauge; 5. Support frame; 51. Hook; 52. Baffle; 53. Support plate; 54. Clearance hole. Detailed Implementation

[0018] To make the technical problems, technical solutions, and beneficial effects to be solved by this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and are not intended to limit the scope of this application.

[0019] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly on that other component. When a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to that other component.

[0020] In the description of this application, it should be noted that, unless otherwise expressly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0021] Please see Figure 1 This application provides a thixotropic mud drag reduction effect testing device, including a base plate 1 with a guide rail 11, a trough 3 slidably disposed on the guide rail 11, and a motor 2 mounted on the base plate 1. The trough 3 is filled with thixotropic mud, and a concrete test block 4 is placed on the thixotropic mud. A winding reel 21 is mounted on the output shaft of the motor 2, and a rope 22 is wound on the winding reel 21. One end of the rope 22 is connected to the end face of the trough 3. A tension gauge 41 is connected to the end face of the concrete test block 4 away from the rope 22.

[0022] The trough 3 has a rectangular structure, which facilitates the sliding of the concrete test block 4 within the trough 3.

[0023] The test procedure is as follows: Thixotropic mud is poured into the rectangular tank 3, and the concrete specimen 4 is placed at the forefront of the tank 3 in the direction of movement. A handheld tension gauge 41 is used to keep the concrete specimen 4 stationary. The motor 2 is started, and the winding reel 21 rotates, pulling the tank 3 at a constant speed via the rope 22. As the tank 3 moves, the concrete specimen 4 moves at a constant speed in the opposite direction relative to the tank 3. The value displayed on the handheld tension gauge 41 is the sliding friction force F_slip. The formula for calculating the coefficient of friction f is shown in Equation 1 below:

[0024] ;

[0025] In the formula, N is the normal force of the concrete test block.

[0026] As can be seen from the above structure and specific testing process, by driving the tank body 3 to move evenly with the motor 2 and keeping the hand-held tension gauge 41 stationary, the friction coefficient between the concrete test block 4 and the thixotropic mud can be accurately measured. Moreover, the tension gauge 41 in a stationary state is easy to read, avoiding the phenomenon of uneven speed caused by manually dragging the tension gauge 41, thus reducing the detection error.

[0027] In one alternative embodiment, the motor 2 is connected to a speed regulator for adjusting the speed of the motor 2.

[0028] Since the rotational speed of motor 2 is fixed, friction can only be detected at one speed. Therefore, a speed controller (not shown in the attached diagram) is added, which allows for free adjustment of the rotational speed of motor 2 and real-time display of the rotational speed. This enables the detection of the coefficient of friction between the concrete specimen 4 and the thixotropic slurry at any speed, expanding the detection range while maintaining high accuracy.

[0029] In one alternative embodiment, a support frame 5 is provided on the base plate 1, and a fixing mechanism for fixing the tension gauge 41 is provided on the support frame 5.

[0030] Considering that when the force gauge 41 is held manually, the hand may move along with the tank 3 or the correction amplitude may be too large during the movement of the tank 3, resulting in unstable holding, a fixing mechanism can be used to fix the force gauge 41 to further improve the detection accuracy and avoid instability of the reading of the force gauge 41 caused by slight hand movements.

[0031] In one embodiment, the fixing mechanism includes a hook 51. Please refer to... Figure 2 In the market, some tensile testers 41 are designed with pull rings at both ends, and the force is measured by pulling the pull rings at both ends of the tensile tester 41. In this embodiment, the pull ring at one end of the tensile tester 41 can be connected to the concrete test block 4, and the other end can be hung on the hook 51, thereby avoiding the impact of manual holding of the tensile tester 41 on the detection accuracy.

[0032] In another embodiment, please refer to Figure 3 The fixing mechanism includes a baffle 52 fixed to the support frame 5 and a support plate 53 disposed on the baffle 52. The baffle 52 is perpendicular to the base plate 1, and a clearance hole 54 is provided on the baffle 52. The support plate 53 is parallel to the base plate 1. In the market, some tensile testers 41 are designed with a pull ring at one end, and the force is measured by holding the tensile tester 41 body and pulling the pull ring. In this embodiment, the tensile tester 41 can be placed flat on the support plate 53, and the pull ring of the tensile tester 41 can be connected to the concrete test block 4 through the clearance hole 54. During the movement of the test tank 3, the baffle 52 can abut against the end of the tensile tester 41 near the pull ring to fix the tensile tester 41.

[0033] In the description of the above embodiments, specific features, structures, materials, or characteristics may be combined in any suitable manner in one or more embodiments or examples.

[0034] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A device for testing the drag reducing effect of a thixotropic mud, characterized in that, include: A base plate (1) with a guide rail (11), a trough (3) slidably mounted on the guide rail (11), and a motor (2) mounted on the base plate (1). The trough (3) is filled with thixotropic mud, and a concrete test block (4) is placed on the thixotropic mud. A winding reel (21) is mounted on the output shaft of the motor (2), and a rope (22) is wound on the winding reel (21). One end of the rope (22) is connected to the end face of the trough (3). A tension gauge (41) is connected to the end face of the concrete test block (4) away from the rope (22).

2. The device for testing drag reduction effect of thixotropic mud according to claim 1, wherein, The motor (2) is connected to a speed regulator for adjusting the speed of the motor (2).

3. The device of claim 1, wherein the device further comprises a flow meter. A support frame (5) is provided on the base plate (1), and a fixing mechanism for fixing the tension gauge (41) is provided on the support frame (5).

4. The device for testing drag reduction effect of thixotropic mud according to claim 3, characterized in that, The fixing mechanism includes a hook (51).

5. The device for testing drag reduction effect of thixotropic mud according to claim 3, characterized in that, The fixing mechanism includes a baffle (52) fixed on the support frame (5) and a support plate (53) set on the baffle (52). The baffle (52) is perpendicular to the base plate (1). The baffle (52) has a clearance hole (54). The support plate (53) is parallel to the base plate (1).

Images