CN109989761A - A kind of simulation test device constructed for simulating a plurality of Shield Tunneling - Google Patents

Abstract

The invention discloses a simulation test device for simulating the excavation construction of multiple shield tunnels. There are a plurality of inner support cylinders inside, the hydraulic cylinder, the inner support cylinder and the support cylinder are coaxially arranged in a one-to-one correspondence, the outer side of the inner support cylinder is provided with a sleeve that slides with it, and the sleeve passes through the front end plate of the box body It is inserted into the support cylinder, and the sleeve is driven by a hydraulic cylinder; an observation window is provided on the support cylinder. In the invention, the inner support cylinder is used to simulate the segment lining of the shield tunnel, and the sleeve is used to simulate the gap outside the segment lining in the actual construction process. The annular space generated by the push of the sleeve will cause the subsidence of the upper soil, so as to realize the simulation of the tunnel construction process, which is closer to the actual engineering situation, and the simulation results are more accurate and reliable.

Description

A simulation test device for simulating the excavation and construction of multiple shield tunnels

technical field

The invention relates to a simulation test device, in particular to a simulation test device for simulating the excavation construction of multiple shield tunnels.

Background technique

Among a large number of crossing projects, the shield tunneling method is the most common project to cross the existing line. The shield tunneling method is a method of tunnel excavation construction using a shield machine, which has incomparable advantages such as small impact on the surrounding environment, fast construction speed, high quality and efficiency, low labor intensity, safety and environmental protection. The main construction methods in the construction of subways and some large municipal pipelines in major cities. When a new tunnel penetrates an existing tunnel at a short distance, especially when the excavation surface of the new tunnel is advanced near the existing tunnel, it will inevitably cause the uplift of the existing tunnel. If the excavation surface is unstable, it will cause great damage to the existing tunnel and affect its normal use function. However, rail transit facilities have strict requirements on deformation control. The main problem arising from the construction of underpassing existing tunnels is the impact of the construction of new tunnels on existing tunnels. Controllable state has always been a problem. The newly-built tunnels disturb the soil and cause deformation. The deformation of the disturbed surrounding rock causes changes in external forces and supporting conditions. The existing tunnels will undergo settlement, inclination, and cross-section deformation, resulting in longitudinal displacement, lateral deformation and additional deformation of the existing tunnels. internal force. Therefore, in the underpass project, especially in the underpass of the existing subway station and section tunnel project, ensuring the normal operation of the existing line is the starting point and basic goal of the project construction, and minimizing the impact on the existing tunnel is the best project construction. Target. The premise of realizing safe crossing is to fully understand the deformation law, stress and strain change law of existing tunnels caused by the construction of new tunnels, so as to take effective construction measures. Therefore, in the field of geotechnical centrifugal model test, it is urgent to develop a set of simulation test devices for the excavation and construction of multiple shield tunnels, so as to study the impact of new tunnel construction on existing tunnels or buildings.

In the existing simulation test device, an annular water bladder is arranged outside the lining model. This structure will cause uneven deformation or extrusion of the water bladder during the drainage process, and the thickness of the annular space formed is different, which is inconsistent with the actual situation.

SUMMARY OF THE INVENTION

The present invention provides a simulation test device for simulating the excavation construction of multiple shield tunnels in the field of geotechnical centrifugal model test in order to solve the technical problems existing in the known technology, which can better simulate actual engineering conditions.

The technical scheme adopted by the present invention to solve the technical problems existing in the known technology is: a simulation test device for simulating the excavation and construction of multiple shield tunnels, including a box body, on the outside of the box body there are multiple a plurality of horizontally arranged hydraulic cylinders and a plurality of support cylinders, a plurality of inner support cylinders are arranged in the box, and the hydraulic cylinders, the inner support cylinders and the support cylinders are coaxially arranged in a one-to-one correspondence , the front end of the hydraulic cylinder is fixed on the rear end plate of the box body, the rear end of the supporting cylinder is fixed on the front end plate of the box body, and the outer side of the inner support cylinder is provided with sliding The matching sleeve is inserted into the supporting cylinder through the front end plate of the box body, and the sleeve is driven by the hydraulic cylinder; an observation window is provided on the supporting cylinder.

On the basis of the above scheme, the present invention has also made the following improvements:

A displacement sensor fixing beam is installed on the top of the box.

The support cylinder is fixed on the front end plate of the box body through the support cylinder fixing plate, and the three are fixedly connected by a detachable connection structure; the hydraulic cylinder is fixed on the box body through the hydraulic cylinder fixing plate A detachable connection structure is used for fixed connection between the three on the rear end plate of the inner support cylinder; the hydraulic cylinder fixing plate of the inner support cylinder is fixedly connected by a detachable connection structure.

The box body is provided with a detachable side plate.

A height-adjustable support member is provided under the front end of the support cylinder.

A support and positioning part is provided under the rear end of the hydraulic cylinder.

The invention has the advantages and positive effects as follows: the inner support cylinder is used to simulate the segment lining of the shield tunnel, and the sleeve is used to simulate the gap outside the segment lining during the actual construction process. The oil cylinder pushes the sleeve out, and the annular space generated by the pushing of the sleeve will cause the subsidence of the upper soil, so as to realize the simulation of the tunnel construction process, which is closer to the actual engineering situation, making the tunnel shield simulation construction process more realistic The simulation results are more accurate and reliable. Moreover, the invention adopts hydraulic power drive, which can improve the test work efficiency; the structure is simple, the performance is reliable, and the manufacture is simple.

Description of drawings

1 is a perspective view of the main structure of the present invention;

Fig. 2 is the plan view of hydraulic cylinder, extension rod and sleeve of the present invention;

3 is a perspective view of the control valve of the present invention;

FIG. 4 is an electrical schematic diagram of the control box of the present invention.

In the figure: 1. Box body; 2. Side plate; 3. Hydraulic cylinder; 4. Inner support cylinder; 5. Sleeve; 6. Supporting cylinder; 7. Supporting cylinder fixing plate; 8. Hydraulic cylinder fixing plate; 9. Displacement sensor fixed beam; 10. Extension rod; 11. Connecting nut; 12. Locking nut.

Detailed ways

In order to further understand the content of the invention, features and effects of the present invention, the following embodiments are exemplified and described in detail with the accompanying drawings as follows:

Please refer to Fig. 1 to Fig. 4 , a simulation test device for simulating the excavation construction of multiple shield tunnels, including a box 1, on the outside of the box 1 is provided a plurality of horizontally arranged hydraulic cylinders 3 and A plurality of supporting cylinders 6 are provided in the box body 1 with a plurality of inner supporting cylinders 4, the hydraulic cylinder 3, the inner supporting cylinder 4 and the supporting cylinder 6 are coaxially arranged in one-to-one correspondence, The front end of the hydraulic cylinder 3 is fixed on the rear end plate of the box body 1 , and the rear end of the support cylinder 6 is fixed on the front end plate of the box body 1 , on the outside of the inner support cylinder 4 . There is a sleeve 5 slidably matched with it, the sleeve 5 is inserted into the support cylinder 6 through the front end plate of the box body 1, the sleeve 5 is driven by the hydraulic cylinder, the hydraulic pressure The pushing speed of the cylinder 3 can be realized by adjusting the pressure of the hydraulic oil. An observation window is provided on the support cylinder 6 .

In this embodiment, the cylinder rod of the hydraulic cylinder is provided with an extension rod 10 , and the extension rod 10 is connected with the cylinder rod through a connecting nut 11 , the sleeve 5 is provided with a front end plate, and is fixedly connected with the extension rod 10 through a locking nut 12 . A displacement sensor fixing beam 9 is installed on the top of the box body 1 . The supporting cylinder 6 is fixed on the front end plate of the box body 1 through the supporting cylinder fixing plate 7, and the three are fixedly connected by a detachable connection structure; the hydraulic cylinder 3 is fixed by the hydraulic cylinder fixing plate 8 On the rear end plate of the box body 1, the three are fixedly connected by a detachable connection structure; the inner support cylinder 4 and the hydraulic cylinder fixing plate 8 are fixedly connected by a detachable connection structure. The above structure The excavation simulation of tunnels with different distances can be realized by installing the support cylinder fixing plate and the hydraulic cylinder fixing plate with different tunnel hole distances. The box body 1 is provided with a detachable side plate 2, which is convenient for making a foundation model. A height-adjustable support member is provided below the front end of the support cylinder 6 , and more specifically, the support member can use a support rod and a height fine-tuning nut, so as to adjust the level of the support cylinder 6 . A support and positioning member is provided below the rear end of the hydraulic cylinder 3 . More specifically, in this embodiment, the above-mentioned support and positioning member is a positioning plate shared by all the hydraulic cylinders 3 , and the positioning plate is supported at the rear of the hydraulic cylinder 3 . The lower part of the positioning plate is provided with a convex block, and the convex block is embedded in the groove of the support plate on the rear side of the box body.

In this embodiment, the model of the hydraulic cylinder 3 is MOB50x400. The box body is welded by 20mm thick steel plate. The sleeve 5 is made of stainless steel with a wall thickness of 1 mm.

Please refer to Fig. 3 and Fig. 4. Fig. 3 is a perspective view of the control valve of the present invention. The lower part of the valve body is an oil circuit block. The upper part of the road block is equipped with a throttle valve and an overflow valve, and a solenoid valve is installed on the upper part of the throttle valve. In the box, the control box is composed of a transformer, a PLC controller, a DC relay, a control switch and a display lamp.

The working principle of the present invention:

Before the test starts, all hydraulic cylinders 3 are in a retracted state. At this time, the sleeve 5 is located inside the box body 1. The side plates on both sides of the box body 1 are installed, and the soil foundation model is made inside the box body 1. By pressing the control box Corresponding to the button of the hydraulic cylinder, the cylinder rod of the hydraulic cylinder 3 is pushed out, and at the same time, the sleeve 5 on the outer side of the inner support cylinder 4 is driven, and the sleeve 5 is pushed out into the supporting cylinder 6 at the front of the box body. The observation window on 6 observes the advancing distance of the sleeve 5, so far, the excavation of a tunnel is completed. According to the specific test, the simulation of different construction sequences is completed by setting the program. The excavation simulation of tunnels with different spacings is realized by installing the supporting cylinder fixing plate and the hydraulic cylinder fixing plate with different tunnel hole distances. The simulation of the tunnel excavation process by the device has the characteristics of being realistic and flexible in changing the construction sequence and tunnel spacing.

Although the preferred embodiments of the present invention have been described above with reference to the accompanying drawings, the present invention is not limited to the above-mentioned specific embodiments. Under the inspiration of the present invention, personnel can also make many forms without departing from the scope of the present invention and the protection scope of the claims, which all belong to the protection scope of the present invention.

Claims (6)

1. a kind of for simulating the simulation test device of a plurality of Shield Tunneling construction, which is characterized in that including cabinet, in institute The outside for stating cabinet is equipped with multiple horizontally disposed hydraulic cylinders and multiple support cylinders, and multiple inner support cylinders are equipped in the cabinet, The hydraulic cylinder, the inner support cylinder and the support cylinder are coaxially disposed correspondingly, and the front end of the hydraulic cylinder is fixed on institute It states on the end plate of cabinet, the rear end of the support cylinder is fixed on the front end-plate of the cabinet, in the outside of the inner support cylinder Equipped with the sleeve being slidably matched with it, the front end-plate that the sleeve passes through the cabinet is inserted into the support cylinder, the set Cylinder is by the Driven by Hydraulic Cylinder；Observation window is equipped on the support cylinder.

2. according to claim 1 for simulating the simulation test device of a plurality of Shield Tunneling construction, feature exists In being equipped with displacement sensor fixed cross beam at the top of the cabinet.

3. according to claim 1 for simulating the simulation test device of a plurality of Shield Tunneling construction, feature exists In the support cylinder is fixed on the front end-plate of the cabinet by support cylinder fixed plate, and releasable connection knot is used between three Structure is fixedly connected；The hydraulic cylinder is fixed on the end plate of the cabinet by hydraulic cylinder fixed plate, is adopted between three It is fixedly connected with releasable connection structure；The inner support cylinder and the hydraulic cylinder fixed plate are consolidated using releasable connection structure Fixed connection.

4. according to claim 1 for simulating the simulation test device of a plurality of Shield Tunneling construction, feature exists In the cabinet is equipped with dismountable side plate.

5. according to claim 1 for simulating the simulation test device of a plurality of Shield Tunneling construction, feature exists In equipped with height-adjustable support member below the front end of the support cylinder.

6. according to claim 1 for simulating the simulation test device of a plurality of Shield Tunneling construction, feature exists In equipped with support positioning element below the rear end of the hydraulic cylinder.