A visualization test system for simulating rectangular pipe jacking construction

Abstract

The present invention relates to a test device for simulating visualization of special-shaped jacking construction. The device includes: a transparent test soil box, a special-shaped shield excavation support device, a jacking power device, and a PIV digital image processing system. The soil box is a transparent special soil box, which can realize existing pipelines of different depths when matched with a baffle. Transparent soil is filled inside, and fluorescent particles are arranged at designated positions. Lightweight transparent plastic piles are arranged at corresponding positions; the shield cutter disc uses a large cutter disc to drive four small cutter discs to cut the soil through a gear system, and the cutting coverage area reaches 90%; the PIV digital image technology includes: a high-speed camera, a laser emitting device, and an image processing computer. The present invention uses a rectangular shield machine cutter disc to cut the soil, and a single-chip microcomputer jacking device is used at the rear to control the excavation jacking force. During the excavation process, a laser source is used to emit sheet light to irradiate the fluorescent particles, and a high-speed camera is used to monitor the fluorescent particles in real time, and the excavation situation is simulated according to the dynamic flow of the fluorescent particles.

Description

Technical Field

[0001] The invention discloses a visualization test system for simulating rectangular pipe jacking construction, and belongs to the technical field of tunnels and underground engineering. Background Art

[0002] Tunnel shield construction has the characteristics of fast construction speed, low noise, and no occupation of ground traffic. The jacking method is an improvement on the shield construction, and the splicing of the pipe segments of the shield construction is changed to be completed in the working pit. Compared with the traditional shield, the jacking method uses the overall prefabrication of the pipe segment, which is easy to ensure the structural strength, good force performance, small joints, and good waterproofness. The rectangular shield section in the special-shaped shield has the highest utilization rate and can save a lot of space. Therefore, the test simulation research of rectangular jacking construction is extremely important. The soil pressure in the earth pressure balance chamber of the jacking construction has a great influence on the disturbance of the soil body, but because the construction is inside the soil body, it cannot be directly observed. In addition, there are few special-shaped shield test studies at this stage, and the types of excavation test simulations are relatively single. Therefore, it is extremely important to design a test method and a rectangular jacking test machine that can intuitively monitor the jacking excavation in real time. Summary of the invention

[0003] The present invention proposes a visualization test system for simulating rectangular jacking construction, which aims to solve the defects existing in the existing technical field of special-shaped jacking test. A visualization test model is proposed which can directly observe the disturbance of the surrounding soil and piles caused by the rectangular jacking construction. The visualization test model can simulate the excavation process of the jacking cutter head, the pipe joint support function, directly observe the flow state of the soil and the impact on the pile when side-penetrating the bridge pier.

[0004] The technical solution of the present invention is a visualization test system for simulating rectangular jacking construction, including a rectangular jacking excavation test machine, a soil box, a jacking power system, and a PIV digital imaging processing system, wherein:

[0005] The rectangular jacking pipe excavation test machine comprises a cutter head, a workbench, a support shell, and a partition. The workbench is connected to one end of the support shell, and the other end of the support shell is provided with a cutter head and a partition to form a soil ballast chamber.

[0006] The jacking system of the rectangular pipe jacking test machine includes a single-chip microcomputer, a jack, a power rod and a steel sleeve. The sleeve is clamped to tighten the support shell. The jack is fixed to one end of the workbench. The power rod is respectively fixed to the jack and the steel sleeve. The steel sleeve is placed at the midpoint of the four sides of the support shell. The jacking system adopts single-chip microcomputer digital control to control the propulsion speed, forward and backward, and thrust size.

[0007] The soil box is a transparent glass box with reserved holes for top pipes on both sides. A transparent plastic protective film is placed on the side holes. Two symmetrical long holes are opened on the left and right sides of the soil box. Card slots are provided on both sides of the inner wall. Circular holes are evenly distributed on the card slots. A special transparent baffle with reserved holes is used to penetrate the transparent pipe to realize pipeline models of different depths.

[0008] The PIV digital imaging processing system includes fluorescent tracer particles, transparent soil, lasers, high-speed cameras and computers. Saturated transparent soil is contained in the soil box. Transparent piles are arranged on both sides of the tunnel. The piles are made of TPX material and a loading instrument is placed on the upper end. Three layers of fluorescent tracer particles are evenly buried above the jacking path, and multiple layers of fluorescent tracer particles are buried between the piles and the tunnel. Three lasers are respectively assumed above and on the side of the soil box, and a high-speed camera is used to collect images and upload them to a computer for image processing.

[0009] A transparent mixed oil is applied between the inner wall of the soil box and the baffle to prevent air from infiltrating and affecting the observation effect.

[0010] The rectangular jacking pipe excavation test machine comprises a motor, a cutter disc, a cutter, a transmission rod, a workbench, a support shell, a partition, a screw conveyor, a mud pump, and a foam agent conduit. The workbench is connected to one end of the support shell, the motor is fixed in the support shell, and a cutter disc and a partition are provided on the inner side of the other end of the support shell to form a soil ballast chamber. A reserved rectangular hole is provided at the lower end of the partition, and the screw conveyor enters the soil ballast chamber through the reserved hole. A circular hole is reserved at the upper end of the partition. The foam agent conduit is fixed on the inner wall of the support shell, passes through the circular hole, and penetrates into the upper part of the soil ballast chamber. The foam agent conduit injects the external foam agent into the soil ballast chamber through the mud pump.

[0011] One end of the transmission rod is connected to the motor, and the ball bearing is installed on the partition and the cutter disc. The other end of the transmission rod passes through the partition and the cutter disc through the ball bearing. The main gear and the main cutter pass through the transmission rod. Four bearings are evenly arranged on the cutter disc. The cutter disc is passed through with nail buckles to fix four sets of auxiliary cutters and auxiliary gears. The main cutter and the auxiliary cutter are linked to cut the soil through gears, and the cutter as a whole and the gears are in a skeleton form.

[0012] It also includes a slide base. The slide base is arranged in the support shell, and the motor is fixed on the slide base to prevent position deviation during excavation.

[0013] A slag discharge hole is reserved at the lower end of the cutter disc to discharge the slag into a soil pressure bin between the cutter disc and the partition plate.

[0014] The cutter disc is provided with a transmission rod and a nail button hole, the partition is provided with a transmission rod hole, bearings are embedded in corresponding positions, and lubricating oil is applied on the surface to ensure the sealing of the soil pressure bin and the small rotation friction of the transmission rod.

[0015] The support shell is made of transparent glass and has conduit holes at corresponding positions; the slag discharge device uses a variable speed screw machine to discharge slag, which is fixed at the bottom of the partition, and a collecting container is provided under the slag discharge end; the conduit is a transparent plastic conduit, which is fixed on the reserved hole on the upper side of the support shell and injected with foam agent.

[0016] The main cutter and the auxiliary cutter are equipped with diamond-shaped rotary cutters and are both made of transparent quartz glass.

[0017] The main cutting knife and the auxiliary cutting knife are sharpened on one side, and the sharpening directions of the main cutting knife and the auxiliary cutting knife are opposite.

[0018] The soil box has two symmetrical long holes on the left and right sides, a slot is provided on the inner wall, and a circular hole is evenly reserved on the slot. The same circular holes are left at both ends of the special baffle, and a circular hole for passing the pipeline is opened in the center. The soil box is filled with transparent soil material, and piles are provided on both sides of the jacking path, and loading instruments are placed above the piles. The piles are made of TPX material, and three layers of fluorescent tracer particles are evenly laid on the upper part of the jacking route, and fluorescent tracer particles are evenly arranged vertically between the tunnel and the piles. The soil box is made of transparent glass, with rectangular holes reserved at both ends, and a transparent plastic film is laid in the empty hole on one side. Three lasers are evenly set up above the soil box, emitting light vertically on the ground, and the laser in the middle can move forward and backward with the track. The side of the soil box is assumed to be a laser, emitting laser horizontally. A high-speed camera is set up above and on the side of the soil box, respectively, and connected to a computer to collect image data.

[0019] Beneficial effects of the present invention:

[0020] (1) This test device can simulate the impact of tunnels passing through pipe galleries at different depths;

[0021] (2) This rectangular pipe jacking construction test machine can simulate the rectangular pipe jacking process, support process, and slag improvement process;

[0022] (3) This patent simulates the impact of pipe jacking on soil under different working conditions by monitoring the changes in the settlement tank;

[0023] (4) Through PIV digital imaging technology, transparent materials are used to simulate the pipe jacking process and visually monitor the disturbance conditions at different locations of the soil;

[0024] (5) The jacking device adopts a single-chip microcomputer system, which can control the jacking rate and thrust of the jack. The thrust rods are set at the midpoints of the four sides of the support shell, which can control the thrust of each rod and realize the correction and replacement of the position during the jacking process. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Attached Figure 1 It is a schematic diagram of the soil box structure.

[0026] Attached Figure 2 It is a schematic diagram of the overall device structure.

[0027] Attached Figure 3 It is a schematic diagram of the overall device structure.

[0028] Attached Figure 4 It is a front plan view of the gear device and the tool.

[0029] Attached Figure 5 It is a schematic diagram of the cutter disc structure.

[0030] Attached Figure 6 It is a schematic diagram of the partition structure.

[0031] Attached Figure 7 It is a front plan view of the gear device and the tool.

[0032] Attached Figure 8 These are the side and top views of the TPX model pile.

[0033] In the figure, 1. auxiliary cutter blade, 2. auxiliary cutter, 3. main cutter blade, 4. main gear, 5. main cutter, 6. auxiliary gear, 7. cutter disc, 8. diamond cutter, 9. TPX model pile, 10. slag inlet hole, 11. nail buckle, 12. ball bearing, 13. transmission rod, 14. bearing, 15. workbench, 16. steel sleeve, 17. motor, 18. support shell, 19. partition, 20. screw conveyor, 21. mud pump, 22. foam agent conduit, 23. loading instrument, 24. tracer particles, 25. transparent film, 26. transparent organic glass, 27. power rod, 28. chute base. DETAILED DESCRIPTION

[0034] A visualization test system for simulating rectangular pipe jacking construction comprises a soil box, a PIV digital imaging processing system, a rectangular pipe jacking excavation test machine, and a jacking power system.

[0035] The soil box has two symmetrical long holes on the left and right sides, and a slot is provided on the inner wall. The slot has uniformly reserved circular holes. The same circular holes are left at both ends of the special baffle, and a circular hole for passing the pipeline is opened in the center. The soil box is filled with transparent soil material, and piles are provided on both sides of the jacking path. A loading instrument 23 is placed above the piles. The piles are made of TPX material, which has the characteristics of clarity, high melting point, chemical resistance, acid resistance, alcohol resistance, low density, and light material. It is suitable for use as the disturbed pile material in this patent. Three layers of tracer particles 24 are evenly laid on the upper part of the jacking route, and tracer particles 24 are evenly arranged vertically between the tunnel and the pile. The soil box is made of transparent glass, with rectangular holes reserved at both ends, and a transparent plastic film is laid in the empty hole on one side. Three lasers are evenly set up above the soil box, emitting light vertically to the ground. The laser in the middle can move forward and backward with the track. Lasers are assumed on the side of the soil box to emit lasers horizontally. A high-speed camera is set on the top and side of the soil box and connected to a computer to collect image data.

[0036] The PIV digital imaging system is mainly composed of the above-mentioned tracer particles 24, transparent soil, laser, high-speed camera and image processing computer. The soil box and the pipe jacking machine model in the test model are both made of transparent materials.

[0037] The rectangular pipe jacking test machine mainly includes a pipe jacking cutter disc, a support system, a slag discharge system, a foam injection device, and a jacking device. The cutter disc cutter is connected by a gear and drives four auxiliary cutters to cut the soil. The cutter is sharpened on one side, and the sharpening directions of the main cutter and the auxiliary cutter are opposite. Each cutter is equipped with a diamond-shaped rotary cutter to cut and crush the soil. The cutter disc and the gear are made of transparent quartz glass material, and a skeleton structure is adopted to reduce the use of materials and ensure good perspective. The main cutter and the main gear are fixed on the transmission rod 13, and the transmission rod 13 passes through the ball bearing 12 on the partition 19 to connect to the motor 17. The motor 17 rotates the transmission shaft to drive the main cutter to cut the soil. The motor 17 is fixed on the motor 17 support of the support template. The auxiliary gear and the auxiliary cutter 2 are fixed on the cutter disc by the nail buckle 11. A slag discharge hole is left at the lower end of the cutter disc to discharge the slag into the soil pressure bin between the cutter disc and the partition 19. The support system uses transparent organic glass 26, and a hole is reserved above the support shell 18. The pump injects the foaming agent into the earth pressure bin through the grouting pipe to ensure the smooth discharge of the soil in the bin. The variable speed screw machine discharges the slag in the earth pressure bin into the soil collection container. The jacking power device is mainly fixed on the workbench 15 by four jacks, and the support shell 18 tightened by the jacking steel sleeve 16 is controlled by a single chip microcomputer to achieve controllable propulsion.

[0038] The laser emitted by the laser above the soil box can illuminate the tracer particles 24 buried above the jacking route. After the jacking test machine excavates, a settlement trough is formed, and the changes in the settlement trough are observed. The amount of excavation is adjusted by changing the rotation rate of the screw machine, and the soil pressure in the soil bin is changed. The changes in the settlement trough are monitored under different soil pressure conditions. The tracer particles 24 buried between the tunnel and the pile body are photographed by a high-speed camera to record the impact of the jacking pipe side-through the bridge pier on the pile body.

[0039] The foaming agent conduit 22 is fixed on the inner wall of the supporting shell 18, passes through the reserved holes of the partition 19, and transports the foaming agent to the soil pressure bin by pumping to improve the slag, so that the slag can be discharged smoothly from the lower screw machine.

[0040] Transparent soil material uses saturated soil, and the physical properties of the material are similar to those of real soil. Filling the pores inside the soil ensures that there are no bubbles, and the refractive index is the same, so that it can be fully transparent.

[0041] A transmission rod 13 and a nail button 11 hole are provided on the cutter disc, a transmission rod 13 hole is provided on the partition 19, a bearing 14 is embedded in the corresponding position, and lubricating oil is applied on the surface to ensure the sealing of the soil pressure bin and the rotation friction of the transmission rod 13 is small.

[0042] The support of the motor 17 is provided with a slide groove, which can fix the motor 17 to prevent position deviation during the excavation process.

[0043] The speed of the motor 17 can be changed to control the speed of the cutter, the microcontroller can control the jacking speed, and the screw machine speed can control the slag discharge speed to monitor the flow of the tracer particles 24, observe the changes in the sedimentation tank, and simulate the surface settlement under different conditions.

[0044] The speed of the motor 17 can be controlled to control the speed of the cutter, the single chip can control the jacking speed, and the screw machine speed can control the slag discharge speed to monitor the flow of the tracer particles 24 and simulate the impact of the tunnel side-through the bridge pier on the pile body and the soil between them.

[0045] Compared with the prior art, the present invention has the following technical effects.

[0046] (1) This test device can simulate the impact of tunnels passing through pipe galleries at different depths;

[0047] (2) This rectangular pipe jacking construction test machine can simulate the rectangular pipe jacking process, support process, and slag improvement process;

[0048] (3) This patent simulates the impact of pipe jacking on soil under different working conditions by monitoring the changes in the settlement tank;

[0049] (4) Through PIV digital imaging technology, transparent materials are used to simulate the pipe jacking process and visually monitor the disturbance conditions at different locations of the soil;

[0050] (5) The jacking device adopts a single-chip microcomputer system, which can control the jacking speed and thrust of the jack. The thrust rods are set at the midpoints of the four sides of the support shell 18, which can control the thrust of each rod and realize the correction and replacement during the jacking process.

[0051] Example 1

[0052] The technical solution of the present invention is further described below in conjunction with the accompanying drawings

[0053] like Figure 1 As shown in 2, the present invention provides a visualization test model that can directly observe the disturbance of the surrounding soil and pile bodies caused by the rectangular jacking pipe construction under complex working conditions, including a soil box, a PIV digital imaging processing system, a rectangular jacking pipe excavation test machine, and a jacking power system.

[0054] Fix two baffles at the same position of the soil box, pass the transparent pipe through the baffle and span in the soil box, and use rubber stirrups at the pipe joints to prevent wind and water leakage;

[0055] Saturated transparent soil is loaded into the soil box 26, and fluorescent particles 24 are laid at the corresponding positions. After the transparent soil is loaded, the pile body 9 is inserted. A loading instrument 23 is placed on the upper end of the pile body.

[0056] The laser transmitters are set up on both sides of the soil box, and the laser transmitters above the soil box are placed on the track along the jacking path. A high-speed camera is aimed at the starting end of the jacking pipe and connected to a computer equipped with image processing software.

[0057] The rectangular jacking test machine mainly includes: a cutter disc, a cutter, a partition 19, a support shell 18, a spiral slag discharger, and a foam agent conduit 22. First, four bearings 14 are fixed on the cutter disc, and the nail buckles 11 are used to pass through the cutter disc, four sets of auxiliary cutters 2 and auxiliary gears 6, and the other end is fixed to the auxiliary diamond cutter 8. Then the motor 17 is fixed on the slide base 28, and the transmission rod 13 is connected to the motor 17. The ball bearing 12 is installed on the partition 19 and the cutter disc 7, and the transmission rod 13 passes through the partition 19 and the cutter disc 7 through the ball bearing 12. The main gear 4 and the main cutter 5 pass through the transmission rod 13, and the other end of the transmission rod 13 fixes the diamond cutter 8. There are cutter discs 7 and partitions 19 in the model to form a soil ballast. There is a reserved rectangular hole at the lower end of the partition 19, and the spiral conveyor 20 enters the soil ballast through the reserved hole. A circular hole is left at the upper end of the partition 19, and a foaming agent conduit 22 is fixed on the inner wall of the support, and the circular hole is perforated to penetrate into the upper part of the earth ballast tank. The foaming agent conduit 22 injects the external foaming agent into the earth ballast tank through a pump 21.

[0058] The jacking system mainly includes: single chip microcomputer, jack, power rod 27, steel sleeve 16. First, fix the workbench 15, on which there is a single chip microcomputer control device with a designed program: front and rear control of the laser transmitter, speed control of the motor of the cutter head 7, speed control of the screw machine and jack thrust control device. Fix the jack to one end of the workbench 15, and fix the power rod 27 to the jack and the steel sleeve 16 respectively. The steel sleeve 16 is placed at the midpoint of the four sides of the support shell 18. The control device on the workbench 15 can control the thrust of the four jacks and the speed of the screw machine according to the needs.

[0059] During the test, the laboratory environment was kept dark, and all laser emitters and high-speed cameras were turned on. The workbench 15 was used to control the jacking of the pipe jacking machine. The images uploaded to the computer by the high-speed camera were used to identify the flow of the surrounding soil and the displacement of the pile during the jacking process. The upper laser emitter moved forward and backward along the track during the jacking process, stimulating the light sheet to observe the changes in the sedimentation tank above the pipe jacking machine. According to the changes in the sedimentation tank, the slag discharge speed of the screw machine, the rotation speed of the cutter head 7 and the size of the jacking force were controlled.

[0060] During the test, foaming agent is added according to the situation to prevent clogging by debris.

[0061] This embodiment has the following advantages:

[0062] 1) The transparent soil technology was used, with visual operation, to provide the specific method of transparent soil pipe jacking test;

[0063] 2) Single chip microcomputer technology is used to control the cutter head speed, thrust force and screw machine speed;

[0064] 3) The pipe jacking machine adopts a rectangular shape, and the operation of the cutter is simplified according to the situation;

[0065] 4) The use of foaming agent increases the efficiency of slag discharge and prevents slag from blocking the outlet;

[0066] 5) The up-and-down test of existing pipelines at different depths can be carried out as required.

Claims

1. A visualization test system for simulating rectangular pipe jacking construction, characterized by: The invention comprises a rectangular pipe jacking test machine, a soil box, a jacking power system, and a PIV digital imaging processing system, wherein: the jacking power system comprises a single chip microcomputer, a jack, a power rod (27), and a steel sleeve (16), the steel sleeve (16) clamps the support shell, the jack is fixed to one end of the workbench (15), the power rod (27) is respectively fixed to the jack and the steel sleeve (16), the steel sleeve (16) is placed at the midpoint of the four sides of the support shell, and the jacking system adopts a single chip microcomputer digital control, which can control the propulsion speed, forward and backward, and thrust size; The PIV digital imaging processing system comprises fluorescent tracer particles (24), transparent soil, lasers, high-speed cameras and computers. Saturated transparent soil is contained in a soil box. Transparent piles are provided on both sides of the tunnel. The piles are made of TPX material and have loading instruments (23) on the top. Three layers of fluorescent tracer particles (24) are evenly buried above the jacking path. Multiple layers of fluorescent tracer particles (24) are buried between the piles and the tunnel. Three lasers are respectively set up above and on the sides of the soil box. A high-speed camera is used to collect images and upload them to a computer for image processing. The rectangular jacking pipe excavation test machine comprises a motor (17), a cutter head (7), a cutter, a transmission rod (13), a workbench (15), a support shell (18), a partition (19), a screw conveyor (20), a mud pump (21), and a foam agent conduit (22). The workbench (15) is connected to one end of the support shell (18). The motor (17) is fixed in the support shell (18). The other end of the support shell (18) is provided with a cutter head (7) and a partition (19) on the inner side to form an earth ballast chamber. A rectangular hole is reserved at the lower end of the partition (19). The screw conveyor (20) enters the earth ballast chamber through the reserved hole. A circular hole is reserved at the upper end of the partition (19). The foam agent conduit (22) is fixed on the inner wall of the support shell (18), passes through the circular hole, and penetrates into the upper part of the earth ballast chamber. The foam agent conduit (22) injects external foam agent into the earth ballast chamber through the mud pump (21). One end of the transmission rod (13) is connected to the motor (17), and the ball bearing (12) is installed on the partition (19) and the cutter disc (7). The other end of the transmission rod (13) passes through the partition (19) and the cutter disc (7) through the ball bearing (12). The main gear (4) and the main cutter (5) pass through the transmission rod (13). Four bearings (14) are evenly arranged on the cutter disc (7). The nail buckle (11) passes through the cutter disc (7) to fix four groups of auxiliary cutters (2) and auxiliary gears (6). The main cutter and the auxiliary cutter are linked to cut the soil through gears, and the cutter and the gear are in the form of a skeleton. The soil box is a transparent glass box, with reserved holes for top pipes on both sides, a transparent plastic protective film is placed on the side holes, two symmetrical long holes are opened on the left and right sides of the soil box, and slots are provided on both sides of the inner wall. Circular holes are evenly distributed on the slots, and the same circular holes are reserved at both ends, and a baffle with a circular hole for passing the pipe is opened in the center; Run the transparent tube through to realize pipeline models of different depths; The soil box is filled with transparent soil material, and piles are arranged on both sides of the jacking path, and a loading instrument (23) is placed above the piles; the piles are made of TPX material, and three layers of fluorescent tracer particles (24) are evenly laid on the upper part of the jacking route, and fluorescent tracer particles (24) are evenly arranged vertically between the tunnel and the piles; the soil box is made of transparent glass material, and rectangular holes are reserved at both ends, and a transparent plastic film is arranged in the hole on one side; three lasers are evenly set up above the soil box to emit light vertically to the ground, and the laser in the middle can move forward and backward with the track, and a laser is set up on the side of the soil box to emit laser horizontally; a high-speed camera is set up above and on the side of the soil box respectively, and connected to a computer to collect image data.

2. A visualization test system for simulating rectangular pipe jacking construction according to claim 1, characterized in that A transparent mixed oil is applied between the inner wall of the soil box and the baffle to prevent air from infiltrating and affecting the observation effect.

3. A visualization test system for simulating rectangular pipe jacking construction according to claim 1, characterized in that It also includes a chute base (28), the chute base (28) is arranged in the support shell (18), and the motor (17) is fixed on the chute base (28) to prevent position deviation during excavation.

4. A visualization test system for simulating rectangular pipe jacking construction according to claim 1, characterized in that A slag discharge hole is left at the lower end of the cutter disc (7), and the slag is discharged into the soil ballast chamber between the cutter disc (7) and the partition plate (19).

5. A visualization test system for simulating rectangular pipe jacking construction according to claim 1, characterized in that The cutter head (7) is provided with a transmission rod (13) and a hole for the nail button (11), the partition (19) is provided with a hole for the transmission rod (13), a bearing (14) is embedded in the corresponding position, and lubricating oil is applied to the surface to ensure the sealing of the earth ballast tank and the rotation friction of the transmission rod (13) is small.

6. A visualization test system for simulating rectangular pipe jacking construction according to claim 1, characterized in that The support shell (18) is made of transparent glass and has conduit holes at corresponding positions; the slag discharge device uses a variable speed screw machine to discharge slag and is fixed at the bottom of the partition (19), and a collection container is provided under the slag discharge end; the foam agent conduit (22) is made of a transparent plastic conduit and is fixed to the reserved hole on the upper side of the support shell, and the foam agent is injected.

7. The visualization test system for simulating rectangular pipe jacking construction according to claim 1 is characterized by: The main cutter (5) and the auxiliary cutter (2) are provided with diamond-shaped rotary cutters, both of which are made of transparent quartz glass material.

8. A visualization test system for simulating rectangular pipe jacking construction according to claim 1 or 7, characterized in that The main cutting knife (5) and the auxiliary cutting knife (2) are sharpened on one side, and the sharpening directions of the main cutting knife (5) and the auxiliary cutting knife (2) are opposite.

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