Novel pipe jacking test simulation device

Abstract

The utility model relates to the technical field of pipe-jacking tests, and provides a novel pipe-jacking test simulation device which comprises a rock-soil box main body, the rock-soil box main body is used for containing a simulation stratum needed for forming an experiment, holes are symmetrically formed in the middles of the two end faces of the rock-soil box main body, and pipe joints are installed on the inner sides of the holes formed in the middle of the rock-soil box main body; the horn-mouth-shaped flange plate is arranged between the pipe joint and the rock-soil box main body, the horn-mouth-shaped flange plate is used for sliding sealing connection, and the horn-mouth-shaped flange plate is connected with the rock-soil box main body through bolts; a separated structure is adopted, the top cover, the upper loading mechanism and the device body are separated, it is avoided that the components hinder filling of test soil in the test process, soil filling is more convenient, the horn-mouth-shaped flange plate is additionally arranged between the hole and the pipeline, the pipe clamping phenomenon is effectively avoided, and the test efficiency is improved. The risks of test interruption and pushing device damage caused by pipe clamping are reduced, and the stability and accuracy of the test are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of pipe jacking tests, in particular to a novel pipe jacking test simulation device. Background Art

[0002] Pipe jacking is a crucial underground engineering technology, widely used in urban infrastructure construction, such as underground pipeline laying and subway tunneling. Pipe jacking test simulators play a crucial role in the research, development, and implementation of pipe jacking. These simulators can simulate pipe jacking tests with varying test parameters in the laboratory, providing scientific guidance for practical pipe jacking operations.

[0003] At present, the jacking test simulation devices available on the market are mainly composed of the main part of the geotechnical box, holes, pipe sections, top covers, upper loading mechanisms, pushing devices and other components. The main part of the geotechnical box is used to contain the simulated strata required for the experiment, and the holes and pipe sections are connected in some way to simulate the jacking process of the pipe sections in the simulated strata. The top cover and the upper loading mechanism are used to apply pressure or tension to the simulated strata in the main part of the geotechnical box to simulate the stratum pressure or tension in actual engineering. The pushing device is used to provide the jacking force when the pipe section is pushed forward horizontally in the simulated stratum;

[0004] During the test, digging and filling the test soil is a crucial step. However, the original device could only perform this operation from the upper end. Due to the heavy weight of the test soil (approximately 100 kilograms of test soil needed to be dug and filled for each test), each operation required the collaboration of multiple people (usually four), and was time-consuming (approximately six minutes per test). This process was not only time-consuming and labor-intensive, but also inefficient, hindering the rapid and accurate completion of the test.

[0005] Therefore, those skilled in the art have proposed a novel pipe jacking test simulation device to solve the problems raised in the background art. Summary of the Invention

[0006] In order to solve the above technical problems, the utility model provides a novel pipe jacking test simulation device, which reduces the risk of test interruption and damage to the pushing device due to pipe jamming by adding a trumpet-shaped flange between the hole and the pipe.

[0007] A novel pipe jacking test simulation device includes a geotechnical box body, the geotechnical box body is used to contain simulated strata required for the experiment, holes are symmetrically opened in the middle of both end surfaces of the geotechnical box body, and pipe joints are installed inside the holes opened in the middle of the geotechnical box body;

[0008] A bell-shaped flange is provided between the pipe joint and the geotechnical box body, the bell-shaped flange is used for sliding sealing connection, and the bell-shaped flange and the geotechnical box body are connected by bolts;

[0009] A detachable hollow top cover, wherein the detachable hollow top cover is connected to the geotechnical box body by bolts;

[0010] A pressure plate, the pressure plate is in sliding and sealing contact with the inner wall of the geotechnical box body, the pressure plate slides up and down along the inner wall surface of the geotechnical box body, and a pusher is further provided on the top of the geotechnical box body;

[0011] Side wall doors, which are slidably connected to the main body of the geotechnical box and are used for convenient filling and excavation of test soil;

[0012] A conveying channel is connected to the main body of the geotechnical box with bolts and is used for discharging the test soil.

[0013] Preferably, tension devices are provided at both ends of the pipe segment for providing a pushing force when the pipe segment is pushed forward horizontally in the simulated stratum. The inner side wall of the tension device is slidably connected to an active frame of a testing machine. The tension device is a digital horizontal tension testing machine, and the active frame of the testing machine is connected to the end of the pipe segment.

[0014] Preferably, the pushing member includes a separate upper loading mechanism, the upper part of the pressure plate is connected to the separate upper loading mechanism through a force transmission bracket, the separate hollow top cover is fixedly connected to the top of the geotechnical box body, and the separate upper loading mechanism is also installed at the bottom end of the separate hollow top cover.

[0015] Preferably, the outer side wall of the geotechnical box body is slidably connected to a side wall door, and the outer side wall of the geotechnical box body is also fixedly connected to a conveying path, and the conveying path is fixedly connected to the outer side wall of the geotechnical box body in an inclined shape.

[0016] Preferably, a high-precision force sensor is provided between the detachable upper loading mechanism and the detachable hollow top cover, the high-precision force sensor is used to accurately measure the pressure or tension value in real time, and the high-precision force sensor is fixed to the detachable hollow top cover using bolts.

[0017] Preferably, it also includes a door-side hook, which is welded to the geotechnical box body and is used to hang test soil bags or other tools.

[0018] Preferably, a movable frame is installed at the bottom end of the geotechnical box body, and the bottom of the movable frame is provided with universal wheels with a braking function to facilitate the movement and fixation of the device.

[0019] Preferably, the pipe segments extend beyond the two ends of the geotechnical box body, and sliding support mechanisms are spaced below to support the pipe segments and reduce friction.

[0020] Preferably, a geotechnical box transparent plate is provided on the outer side wall of the geotechnical box body, and monitoring and measuring instruments are provided on the side of the geotechnical box transparent plate for observing the experimental process and recording data.

[0021] Preferably, the separate upper loading mechanism is a hydraulic cylinder or a force transmission screw, and the loading force can be adjusted according to experimental requirements.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] 1. A separate structure is adopted to separate the top cover and upper loading mechanism from the main body of the device, which prevents these components from obstructing the filling of test soil during the test, making filling more convenient. The trumpet-shaped flange added between the hole and the pipe effectively avoids the occurrence of pipe jamming, reduces the risk of test interruption and damage to the pushing device due to pipe jamming, and improves the stability and accuracy of the test.

[0024] 2. By adding excavation doors and slides on the side walls, the excavation and filling of test soil become more convenient, reducing manpower requirements and time consumption. Thrust devices are installed at both ends of the device. After the test is completed on the same test tube, the test tube can be pushed back to the starting position without digging out the soil, which greatly improves the test efficiency.

[0025] 3. The pipe joints are made of high-strength and easy-to-process materials, such as high-density polyethylene, and the joint parameters can be changed on the outer wall of the pipe joint, such as processing circumferential grooves and ribs, to simulate different test conditions. The main body of the geotechnical box is equipped with a transparent part, and monitoring and measuring instruments are installed on the side to facilitate real-time observation and recording of various parameters during the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 This is one of the three-dimensional structural diagrams of the present utility model;

[0027] Figure 2 This is the second schematic diagram of the three-dimensional structure of the utility model;

[0028] Figure 3 For this utility model Figure 1 Schematic diagram of the front view structure in ;

[0029] Figure 4 For this utility model Figure 1 Schematic diagram of the structure of the trumpet-shaped flange.

[0030] In the figure: 1. Geotechnical box body; 2. Trumpet-shaped flange; 3. Separate hollow top cover; 4. Pressure plate; 5. Separate upper loading mechanism; 6. High-precision force sensor; 7. Side wall door; 8. Conveyor channel; 9. Mobile frame; 10. Universal wheel; 11. Pipe joint; 12. Tension device; 13. Sliding support mechanism; 14. Hook beside the door; 15. Transparent plate of geotechnical box; 16. Active frame of testing machine. DETAILED DESCRIPTION

[0031] The following is a further detailed description of the embodiments of the present invention in conjunction with the accompanying drawings and examples. The following examples are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0032] As attached Figure 1 To the attached Figure 4 As shown:

[0033] Embodiment 1: The present invention provides a novel pipe jacking test simulation device, comprising a geotechnical box body 1, the geotechnical box body 1 being used to contain simulated strata required for the experiment, holes being symmetrically provided in the middle of both end surfaces of the geotechnical box body 1, and pipe sections 11 being installed inside the holes provided in the middle of the geotechnical box body 1;

[0034] A bell-shaped flange 2 is provided between the pipe joint 11 and the geotechnical box body 1. The bell-shaped flange 2 is used for sliding sealing connection, and the bell-shaped flange 2 and the geotechnical box body 1 are connected by bolts;

[0035] A detachable hollow top cover 3, wherein the detachable hollow top cover 3 is connected to the geotechnical box body 1 by bolts;

[0036] A pressure plate 4 is in sliding and sealing contact with the inner wall of the geotechnical box body 1. The pressure plate 4 slides up and down along the inner wall of the geotechnical box body 1. A pusher is also provided at the top of the geotechnical box body 1.

[0037] A side wall door 7 is slidably connected to the geotechnical box body 1 for conveniently filling and excavating test soil;

[0038] The conveying path 8 is bolted to the geotechnical box body 1 and is used for discharging the test soil. Tension devices 12 are provided at both ends of the pipe segment 11 for providing a pushing force when the pipe segment 11 is pushed forward horizontally in the simulated stratum. The inner side wall of the tension device 12 is slidably connected with a testing machine active frame 16. The tension device 12 is a digital horizontal tension testing machine. The testing machine active frame 16 is connected to the end of the pipe segment 11.

[0039] Specifically, the tension device 12 is a digital display horizontal tension testing machine, and its active frame 16 is connected to the end of the pipe section 11. This device can replace the traditional thrust device, reduce the number of high-precision load cells 6 used, and reduce the cost of the device;

[0040] The detachable hollow top cover 3 is bolted to the geotechnical box body 1, making it easy and quick to install and remove. Compared to the original device, it avoids the tedious process of multiple people lifting and aligning the screw holes. Now, one person can complete the installation at a time.

[0041] The bell-shaped flange 2 features an arc-shaped design. This arc-shaped design allows for a smoother connection between the hole and the pipe, without sharp corners or sudden changes. This design facilitates the sliding of the pipe segment 11 within the hole, reducing friction caused by shape mismatches and effectively preventing pipe jams. Because the test required the circumferential machining of grooves and ribs on the outer surface of the pipe segment, these special shapes could make the pipe segment more susceptible to obstruction when passing through the hole. The arc-shaped interior of the flange can better accommodate these unusually shaped pipe segments, reducing the risk of pipe jams caused by shape differences.

[0042] The pushing member includes a separate upper loading mechanism 5, the upper part of the pressure plate 4 is connected to the separate upper loading mechanism 5 through a force transmission bracket, the separate hollow top cover 3 is fixedly connected to the top of the geotechnical box body 1, and the separate upper loading mechanism 5 is also installed at the bottom end of the separate hollow top cover 3. The outer wall of the geotechnical box body 1 is slidably connected to the side wall door 7, and the outer wall of the geotechnical box body 1 is also fixedly connected to the conveying path 8, and the conveying path 8 is fixedly connected to the outer wall of the geotechnical box body 1 in an inclined shape. A high-precision force sensor 6 is provided between the separate upper loading mechanism 5 and the separate hollow top cover 3. The high-precision force sensor 6 is used to accurately measure the pressure or tension value in real time, and the high-precision force sensor 6 is fixed to the separate upper loading mechanism 5 using bolts. The hollow top cover 3 also includes a door hook 14, which is welded to the geotechnical box body 1 and is used to hang test soil bags or other tools. A movable frame 9 is installed at the bottom end of the geotechnical box body 1, and a universal wheel 10 with a brake function is provided at the bottom of the movable frame 9 to facilitate the movement and fixation of the device. The pipe section 11 extends beyond the two ends of the geotechnical box body 1, and a sliding support mechanism 13 is placed at intervals below to support the pipe section 11 and reduce friction. A geotechnical box transparent plate 15 is provided on the outer wall of the geotechnical box body 1, and monitoring and measuring instruments are provided on the side of the geotechnical box transparent plate 15 to observe the experimental process and record data. The separate upper loading mechanism 5 is a hydraulic cylinder or a force transmission screw, and the loading force can be adjusted according to the experimental requirements.

[0043] Specifically, a high-precision load cell 6 is positioned between the detachable upper loading mechanism 5 and the detachable hollow top cover 3 to accurately measure pressure or tension in real time. The high-precision load cell 6 is bolted to the detachable hollow top cover 3 to ensure measurement stability and accuracy.

[0044] As can be seen above, the test soil is first filled into the main body 1 of the geotechnical box through the side door 7. The simulated stratum is compacted using the pressure plate 4 and the separate upper loading mechanism 5. The pipe segment 11 is connected to the hole in the main body 1 of the geotechnical box via the bell-shaped flange 2, ensuring the stability of the connection. The loading force of the separate upper loading mechanism 5 is adjusted according to the experimental requirements, and the test parameters of the digital horizontal tensile testing machine are set. The tension device 12 is activated to provide the thrust force for the pipe segment 11 to be pushed forward horizontally in the simulated stratum. Simultaneously, the pressure or tension values ​​are measured and recorded in real time using a high-precision load cell 6. The soil displacement, thrust speed, and other parameters during the test are observed in real time through the transparent panel 15 of the main body 1 of the geotechnical box and the monitoring and measuring instruments installed on the side. The relevant data is recorded. When the test reaches the predetermined conditions or ends, the tension device 12 is closed and the test soil is discharged. The recorded data is processed and analyzed to obtain the test results and conclusions.

[0045] All standard parts used in this utility model can be purchased commercially, and special-shaped parts can be customized according to the description in the specification and drawings. The specific connection methods of each part adopt conventional means such as bolts, rivets, welding, etc. that are mature in the existing technology. The machinery, parts and equipment all adopt conventional models in the existing technology. In addition, the circuit connections adopt conventional connection methods in the existing technology and will not be described in detail here. Any matters not described in detail in this specification belong to the existing technology known to professional and technical personnel in this field.

[0046] In the description of this utility model, the terms "first" and "second" are used for descriptive purposes only and should not be understood to indicate or imply relative importance or implicitly specify the number of the technical features indicated. Therefore, features specified as "first" or "second" may explicitly or implicitly include one or more of such features. "Multiple" means two or more, unless otherwise specifically defined.

[0047] In this utility model, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, indirect connection through an intermediate medium, internal communication between two components, or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0048] In the present invention, unless otherwise expressly specified or limited, when a first feature is "above" or "below" a second feature, it may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediary. Furthermore, when a first feature is "above," "above," or "above" a second feature, it may mean that the first feature is directly above or diagonally above the second feature, or simply means that the first feature is at a higher level than the second feature. When a first feature is "below," "below," or "below" a second feature, it may mean that the first feature is directly below or diagonally below the second feature, or simply means that the first feature is at a lower level than the second feature.

[0049] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "examples", "specific examples" or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in a suitable manner in any one or more embodiments or examples. In addition, those skilled in the art may combine and combine the different embodiments or examples and the features of different embodiments or examples described in this specification without contradiction.

[0050] In the drawings of the disclosed embodiments of the present invention, only the structures related to the disclosed embodiments are involved. Other structures can refer to the general design. In the absence of conflict, the same embodiment and different embodiments of the present invention can be combined with each other.

[0051] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments, or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A new type of pipe jacking test simulation device, characterized by: The invention comprises a geotechnical box body (1), wherein the geotechnical box body (1) is used to contain simulated strata required for the experiment, holes are symmetrically provided in the middle of both end faces of the geotechnical box body (1), and pipe joints (11) are installed inside the holes provided in the middle of the geotechnical box body (1); A bell-shaped flange (2), the bell-shaped flange (2) being arranged between the pipe joint (11) and the geotechnical box body (1), the bell-shaped flange (2) being used for sliding sealing connection, and the bell-shaped flange (2) and the geotechnical box body (1) being connected by bolts; A detachable hollow top cover (3), wherein the detachable hollow top cover (3) is connected to the geotechnical box body (1) by bolts; A pressure plate (4), the pressure plate (4) is in sliding sealing contact with the inner wall of the geotechnical box body (1), the pressure plate (4) slides up and down along the inner wall surface of the geotechnical box body (1), and a pusher is further provided at the top of the geotechnical box body (1); A side wall door (7) is slidably connected to the geotechnical box body (1) and is used for conveniently filling and excavating test soil; A conveying channel (8) is bolted to the geotechnical box body (1) and is used for discharging test soil.

2. A novel pipe jacking test simulation device as claimed in claim 1, characterized in that: Tension devices (12) are provided at both ends of the pipe section (11) for providing a thrust force when the pipe section (11) is thrust forward horizontally in a simulated stratum. The inner side wall of the tension device (12) is slidably connected to an active frame (16) of a testing machine. The tension device (12) is a digital display horizontal tension testing machine. The active frame (16) of the testing machine is connected to the end of the pipe section (11).

3. A novel pipe jacking test simulation device as claimed in claim 1, characterized in that: The pushing member includes a detachable upper loading mechanism (5), the upper part of the pressing plate (4) is connected to the detachable upper loading mechanism (5) through a force transmission bracket, the detachable hollow top cover (3) is fixedly connected to the top end of the geotechnical box body (1), and the detachable upper loading mechanism (5) is also installed at the bottom end of the detachable hollow top cover (3).

4. A novel pipe jacking test simulation device as claimed in claim 1, characterized in that: The outer side wall of the geotechnical box body (1) is slidably connected to a side wall door (7), and the outer side wall of the geotechnical box body (1) is also fixedly connected to a conveying path (8), and the conveying path (8) is fixedly connected to the outer side wall of the geotechnical box body (1) in an inclined manner.

5. A novel pipe jacking test simulation device as claimed in claim 3, characterized in that: A high-precision force sensor (6) is provided between the detachable upper loading mechanism (5) and the detachable hollow top cover (3). The high-precision force sensor (6) is used to accurately measure pressure or tension values ​​in real time, and the high-precision force sensor (6) is fixed to the detachable hollow top cover (3) using bolts.

6. A novel pipe jacking test simulation device as claimed in claim 1, characterized in that: It also includes a door-side hook (14), which is welded to the geotechnical box body (1) and is used for hanging test soil bags or other tools.

7. A novel pipe jacking test simulation device as claimed in claim 1, characterized in that: A movable frame (9) is installed at the bottom end of the geotechnical box body (1), and a universal wheel (10) with a brake function is provided at the bottom of the movable frame (9) to facilitate the movement and fixation of the device.

8. A novel pipe jacking test simulation device as claimed in claim 1, characterized in that: The pipe section (11) extends beyond the two ends of the geotechnical box body (1), and a sliding support mechanism (13) is placed at intervals below to support the pipe section (11) and reduce friction.

9. A novel pipe jacking test simulation device as claimed in claim 1, characterized in that: The outer side wall of the geotechnical box body (1) is provided with a geotechnical box transparent plate (15), and the side of the geotechnical box transparent plate (15) is provided with monitoring and measuring instruments for observing the experimental process and recording data.

10. A novel pipe jacking test simulation device as claimed in claim 5, characterized in that: The separate upper loading mechanism (5) is a hydraulic cylinder or a force transmission screw, and the loading force can be adjusted according to experimental requirements.

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