Testing device for simulating soil deformation caused by vertical pipe jacking construction

Abstract

The utility model discloses a test device for simulating soil deformation caused by vertical pipe-jacking construction. The test device comprises a model box, a vertical pipe-jacking device and a vertical pipe-jacking device, a horizontal tunnel assembly is mounted in the model box; a vertical pipe jacking assembly is mounted above the horizontal tunnel assembly; the vertical pipe jacking assembly comprises an outer pipe, a middle pipe and an inner pipe which are sequentially arranged from outside to inside. A first cross-shaped steel frame is arranged at the top of the middle pipe; a second cross-shaped steel frame is arranged at the bottom of the inner pipe, and the inner pipe is connected with the outer pipe through the second cross-shaped steel frame; the testing device further comprises a base support. A drawing device is installed through a base support, a steel claw is arranged at the lower end of the drawing device, and the drawing device is connected with the first cross-shaped steel frame through the steel claw, so that the steel claw and the middle pipe are driven to vertically move. According to the utility model, the influence of friction force on the soil body is reduced by only extracting the middle pipe, the test data and the loss rate of the soil body are more accurately measured, and the accuracy of a test result is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of rock and soil mechanics experiments, in particular to a test device for simulating soil deformation caused by vertical pipe jacking construction. Background Art

[0002] Vertical pipe jacking is a modern civil engineering construction method that involves first excavating a horizontal tunnel underground. A vertical pipe jacking machine is then placed in the tunnel and pipe segments are sequentially pushed in, ultimately forming a vertical pipeline. Vertical pipe jacking plays an important role in urban construction and infrastructure development, achieving goals such as efficient resource utilization and environmental protection, improving transportation accessibility, shortening construction schedules, and improving project quality. Because the vertical pipe jacking method opens at the top of the horizontal tunnel and the pipe jacking machine moves vertically upward, it inevitably disturbs the surrounding soil during construction, causing ground deformation, altering the soil stress and displacement fields, and causing ground deformation. When ground deformation exceeds the normal range, it can cause ground subsidence, damaging adjacent ground or underground structures and underground pipelines, and resulting in a series of geotechnical engineering problems.

[0003] Therefore, the stratum loss caused by vertical pipe jacking excavation was studied through a model test device, the principle of soil deformation caused by vertical pipe jacking construction was clarified, and effective response methods were further proposed, which is of great significance to ensuring the safe construction of vertical pipe jacking.

[0004] Currently, the method used to simulate ground loss caused by construction includes the casing method. However, the friction generated by the casing method on the soil when the outer tube is pulled out will cause a certain disturbance to the soil, which greatly reduces the accuracy of the results and cannot accurately and effectively simulate ground loss. Chinese patent CN220171026U discloses a horizontal shield tunnel excavation model test device based on the casing method. This model test device simulates the shield tunnel construction process. The outer tube of the shield model buried in the soil is pulled out at a uniform speed through a horizontal puller, and the diameter difference between the inner and outer tubes is used to simulate the ground loss caused by dynamic shield excavation. However, this device does not take into account the impact of the friction generated by the puller on the soil when extracting the outer tube. Summary of the Invention

[0005] In view of the shortcomings of the existing technology, the utility model provides a test device for simulating soil deformation caused by vertical pipe jacking construction.

[0006] To achieve the above technical objectives, the technical solution of the present invention is a test device for simulating soil deformation caused by vertical jacking construction, the test device comprising: a model box; a horizontal tunnel assembly is installed in the model box; a vertical jacking assembly is installed above the horizontal tunnel assembly; the vertical jacking assembly comprises an outer tube, an intermediate tube, and an inner tube arranged in sequence from the outside to the inside; a first cross steel frame is provided at the top of the intermediate tube; a second cross steel frame is provided at the bottom of the inner tube, which is connected to the outer tube via the second cross steel frame; the test device further comprises a base bracket; a puller is installed via the base bracket, a steel claw is provided at the lower end of the puller, and the puller is connected to the first cross steel frame via the steel claw, thereby driving the steel claw and the intermediate tube to move vertically.

[0007] Furthermore, the test kit further includes:

[0008] Several laser displacement sensors are installed on the base bracket; the data collection module collects the data collected by the laser displacement sensors and transmits it to the data processing module for processing.

[0009] Furthermore, the model box is made of transparent organic glass; and the horizontal tunnel component is made of an organic glass semi-cylindrical shell.

[0010] Furthermore, the front and rear ends of the horizontal tunnel assembly are respectively connected to the front and rear side walls of the model box.

[0011] Furthermore, the vertical jacking pipe assembly adopts a first vertical jacking pipe assembly with a circular cross-section, and the first vertical jacking pipe assembly is sequentially provided with a circular outer pipe, a circular middle pipe and a circular inner pipe from the outside to the inside; the circular outer pipe is provided with a plurality of sieve holes in an array form.

[0012] Furthermore, the sieve holes on the circular outer tube are arranged to be circular.

[0013] Furthermore, the vertical jacking pipe assembly can adopt a second vertical jacking pipe assembly with a rectangular cross-section, wherein the second vertical jacking pipe assembly is sequentially arranged from the outside to the inside with a rectangular outer pipe, a rectangular middle pipe, and a rectangular inner pipe; the rectangular outer pipe is provided with a plurality of sieve holes in an array.

[0014] Furthermore, the sieve holes on the rectangular outer tube are arranged in a rectangular shape.

[0015] Furthermore, the lower end of the vertical jacking pipe assembly is provided with an internal thread, and the horizontal tunnel assembly is provided with a circular protrusion, which is provided with an external thread. The vertical jacking pipe assembly is installed above the horizontal tunnel assembly through the internal thread and the external thread.

[0016] Furthermore, the second cross steel frame provided at the bottom of the inner tube is welded to the outer tube.

[0017] Compared with the prior art, the beneficial effects of the present invention are as follows: the present invention provides a test device for simulating soil deformation caused by vertical pipe jacking construction. On the basis of the casing method, the puller is connected to the first cross steel frame through steel claws, thereby driving the steel claws and the intermediate pipe to move vertically. By only extracting the intermediate pipe, the influence of friction on the soil is reduced, the test data and soil loss rate are measured more accurately, and the accuracy of the test results is increased. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0019] Figure 1 Structural diagram of the test device for simulating soil deformation caused by vertical pipe jacking construction;

[0020] Figure 2 is a first exemplary structural diagram of a vertical pipe jacking assembly;

[0021] Figure 3 A bottom view of a first exemplary structure of a vertical jacking pipe assembly;

[0022] Figure 4 is a second exemplary structural diagram of a vertical pipe jacking assembly;

[0023] Figure 5 is a schematic diagram of the structure of the horizontal tunnel assembly;

[0024] Figure 6 This is a schematic diagram of the structure of the steel claw.

[0025] In the figure, 1-model box; 2-first vertical jacking pipe assembly; 3-horizontal tunnel assembly; 4-puller; 5-steel claw; 6-laser displacement sensor; 7-base bracket; 8-data processing module; 9-data collection module; 10-circular outer tube; 11-circular sieve hole; 12-internal thread; 13-first cross steel frame; 14-circular middle tube; 15-circular inner tube; 16-second cross steel frame; 17-external thread; 18-rectangular outer tube; 19-rectangular middle tube; 20-rectangular inner tube; 21-second vertical jacking pipe assembly. DETAILED DESCRIPTION

[0026] Exemplary embodiments will be described in detail herein, examples of which are illustrated in the accompanying drawings. In the following description, when referring to the drawings, like numbers in different figures represent like or similar elements unless otherwise indicated. The embodiments described in the following exemplary embodiments are not intended to represent all possible embodiments consistent with the present invention. Rather, they are merely examples of apparatus and methods consistent with certain aspects of the present invention, as detailed in the appended claims.

[0027] The terms used in this invention are for the purpose of describing specific embodiments only and are not intended to limit the invention. The singular forms "a," "the," and "the" used in this invention and the appended claims are also intended to include plural forms unless the context clearly indicates otherwise. It should also be understood that the term "and / or" as used herein refers to and includes any or all possible combinations of one or more of the associated listed items.

[0028] It should be understood that although the terms "first," "second," "third," etc. may be used in the present invention to describe various information, such information should not be limited to these terms. These terms are merely used to distinguish information of the same type from one another. For example, first information may also be referred to as second information, and similarly, second information may also be referred to as first information, without departing from the scope of the present invention. Depending on the context, the term "if" as used herein may be interpreted as "when," "when," or "in response to determining."

[0029] The present invention will be described in detail below with reference to the accompanying drawings. Unless there is any conflict, the features of the following embodiments and implementations may be combined with each other.

[0030] like Figure 1 As shown, the present invention provides a test device for simulating soil deformation caused by vertical pipe jacking construction, the test device comprising:

[0031] Model box 1; a horizontal tunnel assembly 3 is installed in the model box 1; a vertical jacking assembly is installed above the horizontal tunnel assembly 3; the vertical jacking assembly includes an outer tube, an intermediate tube, and an inner tube arranged in sequence from the outside to the inside; a first cross steel frame 13 is provided on the top of the intermediate tube; a second cross steel frame 16 is provided at the bottom of the inner tube, and is connected to the outer tube through the second cross steel frame 16; the test device also includes a base bracket 7; a puller 4 is installed through the base bracket 7, and a steel claw 5 (such as Figure 5 As shown), the puller 4 is connected to the first cross steel frame 13 through the steel claw 5, thereby driving the steel claw 5 and the intermediate tube to move vertically.

[0032] Furthermore, the test device further includes: a plurality of laser displacement sensors 6 installed on a base bracket 7; a data collection module 9 collects data collected by the laser displacement sensors 6 and transmits the data to a data processing module 8 for processing.

[0033] Specifically, the laser emitting end of the laser displacement sensor 6 is facing the upper surface of the soil sample and the laser displacement sensors 6 are all installed on the base bracket 7; in this example, eight laser displacement sensors 6 are installed, and the eight laser displacement sensors 6 are all communicatively connected to the data collection module 9, and the data collection module 9 is communicatively connected to the computer processing terminal, namely the data processing module 8.

[0034] Furthermore, the model box 1 is made of transparent organic glass to facilitate observation of soil deformation. The horizontal tunnel assembly 3 is made of an organic glass semi-cylindrical shell, with its front and rear ends connected to the front and rear side walls of the model box 1 respectively.

[0035] Further, if Figure 2 and Figure 3 As shown, the vertical jacking pipe assembly can be a first vertical jacking pipe assembly 2 with a circular cross-section. The first vertical jacking pipe assembly 2 is sequentially provided with a circular outer pipe 10, a circular intermediate pipe 14, and a circular inner pipe 15 from the outside to the inside. The circular outer pipe 10 is provided with a plurality of sieve holes 11 in an array. The sieve holes on the circular outer pipe 10 can be circular.

[0036] Further, if Figure 4 As shown, the vertical jacking pipe assembly can be a second vertical jacking pipe assembly 21 with a rectangular cross-section. The second vertical jacking pipe assembly 21 is sequentially arranged from the outside to the inside with a rectangular outer pipe 18, a rectangular middle pipe 19, and a rectangular inner pipe 20. The rectangular outer pipe 18 is provided with a plurality of sieve holes 11 in an array. The sieve holes on the rectangular outer pipe 18 can be rectangular.

[0037] It should be noted that the present invention provides a first vertical jacking pipe assembly 2 with a circular cross-section and a second vertical jacking pipe assembly 21 with a rectangular cross-section. By replacing outer pipes with different mesh sizes or adjusting the distance between the outer and inner pipes, soil deformation caused by vertical jacking construction under conditions of varying soil loss rates can be achieved. Furthermore, during the test, the power of the puller 4 can be adjusted as needed to adjust the excavation speed of the vertical pipe. Because the vertical jacking pipe model utilizes a detachable device, it can simulate the excavation of vertical pipes with both circular and rectangular cross-sections, avoiding the waste of resources caused by redesigning the model box.

[0038] Specifically, the lower end of the vertical jacking pipe assembly is provided with an internal thread 12, and the horizontal tunnel assembly 3 is provided with a circular protrusion provided with an external thread 17. The vertical jacking pipe assembly is installed above the horizontal tunnel assembly 3 through the internal thread 12 and the external thread 17. The second cross steel frame 16 provided at the bottom of the inner pipe is welded to the outer pipe.

[0039] Furthermore, the base support 7 is composed of two cement bases and a steel frame, and is used to support the vertical puller 4 and install the laser displacement sensor 6.

[0040] Next, based on a test device provided by the present invention for simulating soil deformation caused by vertical pipe jacking construction, the test process is described in detail, which specifically includes the following steps:

[0041] Step S1: Design a test plan based on the working conditions and manufacture a model box 1 and a three-tube nested vertical jacking assembly. When conducting tests on different types of vertical pipeline working conditions, the vertical jacking assembly can be a first vertical jacking assembly 2 with a circular cross-section and a second vertical jacking assembly 21 with a rectangular cross-section.

[0042] Step S2: Clean and dry the model box 1, the three-tube nested vertical jacking pipe assembly, and the horizontal tunnel assembly 3. Fix the model box 1 on the platform, install the horizontal tunnel assembly 3 in the reserved hole of the model box 1, and then connect the three-tube nested vertical jacking pipe assembly to the horizontal tunnel assembly 3.

[0043] Step S3: Connect the puller 4 to the steel claw 5, and pre-grab the steel claw 5 on the first cross steel frame 13 at the top end of the intermediate tube.

[0044] Step S4: prepare the sand required for the test and perform particle screening to ensure that the sand particles can flow normally from the sieve holes, and then slowly fill the model box 1 with the sand to the height required for the test.

[0045] Step S5: evenly distribute and install the laser displacement sensors 6 on the base bracket 7, connect them to the data collection module 9, and then connect them to the data processing module 8 for debugging.

[0046] Step S6: Set the pulling speed of the puller 4 and start it. Pull out the intermediate tube at a uniform speed through the puller 4. When the intermediate tube is pulled out and the sand no longer flows through the sieve hole 11, that is, when the soil deformation process is over, close the puller 4. Wait for 10 minutes until the formation deformation stabilizes before ending the operation of the laser displacement sensor 6.

[0047] Step S7, after completing a set of working condition tests, pour the sand and soil in the model box 1 into a container for standby use, and at the same time push the puller 4 back to its original position to prepare for the next working condition test.

[0048] In summary, based on the casing method, the puller 4 of the present invention is connected to the first cross steel frame 13 through the steel claws 5, thereby driving the steel claws 5 and the intermediate tube to move vertically. By extracting only the intermediate tube, the influence of friction on the soil is reduced, the test data and the soil loss rate are measured more accurately, and the accuracy of the test results is increased.

[0049] Those skilled in the art will readily appreciate other embodiments of the present application after considering the specification and practicing the contents disclosed herein. This application is intended to cover any variations, uses, or adaptations of the present application that follow the general principles of this application and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered as exemplary only.

[0050] It will be understood that the present application is not limited to the exact construction that has been described above and shown in the drawings, and that various modifications and changes may be made without departing from the scope thereof.

Claims

1. A test device for simulating soil deformation caused by vertical pipe jacking construction, characterized in that: The test device comprises: a model box (1); a horizontal tunnel assembly (3) is installed in the model box (1); a vertical jacking pipe assembly is installed above the horizontal tunnel assembly (3); the vertical jacking pipe assembly comprises an outer pipe, an intermediate pipe, and an inner pipe arranged in sequence from the outside to the inside; a first cross steel frame (13) is provided on the top of the intermediate pipe; a second cross steel frame (16) is provided on the bottom of the inner pipe, and is connected to the outer pipe via the second cross steel frame (16); the test device further comprises a base bracket (7); a puller (4) is installed via the base bracket (7), a steel claw (5) is provided at the lower end of the puller (4), and the puller (4) is connected to the first cross steel frame (13) via the steel claw (5), thereby driving the steel claw (5) and the intermediate pipe to move vertically.

2. The test device for simulating soil deformation caused by vertical pipe jacking construction according to claim 1, characterized in that: The test kit also includes: A plurality of laser displacement sensors (6) are mounted on the base bracket (7); a data collection module (9) collects data collected by the laser displacement sensors (6) and transmits the data to a data processing module (8) for processing.

3. The test device for simulating soil deformation caused by vertical pipe jacking construction according to claim 1, characterized in that: The model box (1) is made of transparent organic glass; the horizontal tunnel component (3) is made of an organic glass semi-cylindrical shell.

4. The test device for simulating soil deformation caused by vertical pipe jacking construction according to claim 1 or 3, characterized in that: The front and rear ends of the horizontal tunnel assembly (3) are respectively connected to the front and rear side walls of the model box (1).

5. The test device for simulating soil deformation caused by vertical pipe jacking construction according to claim 1, characterized in that: The vertical jacking pipe assembly adopts a first vertical jacking pipe assembly (2) with a circular cross-section. The first vertical jacking pipe assembly (2) is provided with a circular outer pipe (10), a circular intermediate pipe (14), and a circular inner pipe (15) in sequence from the outside to the inside. The circular outer pipe (10) is provided with a plurality of sieve holes (11) in an array form.

6. The test device for simulating soil deformation caused by vertical pipe jacking construction according to claim 5, characterized in that: The sieve holes on the circular outer tube (10) are arranged in a circular shape.

7. The test device for simulating soil deformation caused by vertical pipe jacking construction according to claim 1, characterized in that: The vertical jacking pipe assembly can adopt a second vertical jacking pipe assembly (21) with a rectangular cross-section, wherein the second vertical jacking pipe assembly (21) is provided with a rectangular outer pipe (18), a rectangular middle pipe (19), and a rectangular inner pipe (20) in sequence from the outside to the inside; and a plurality of sieve holes (11) are opened on the rectangular outer pipe (18) in an array form.

8. The test device for simulating soil deformation caused by vertical pipe jacking construction according to claim 7, characterized in that: The sieve holes on the rectangular outer tube (18) are arranged in a rectangular shape.

9. The test device for simulating soil deformation caused by vertical pipe jacking construction according to claim 1, characterized in that: The lower end of the vertical jacking pipe assembly is provided with an internal thread (12), and the horizontal tunnel assembly (3) is provided with a circular protrusion, which is provided with an external thread (17). The vertical jacking pipe assembly is installed above the horizontal tunnel assembly (3) through the internal thread (12) and the external thread (17).

10. The test device for simulating soil deformation caused by vertical pipe jacking construction according to claim 1, characterized in that: A second cross steel frame (16) provided at the bottom of the inner tube is welded to the outer tube.

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