Device for measuring change of acting force of shield tunneling machine and double-tunnel shield tunneling machine on front soil body

Abstract

The utility model belongs to the field of building construction, and particularly relates to a device for measuring changes of acting force of a shield tunneling machine and a double-tunnel shield tunneling machine on a front soil body. Each earth pressure gauge comprises a square tube, a pressure sensor arranged on the square tube, a wireless strain sensor gateway and a solar panel, wherein the wireless strain sensor gateway and the solar panel are connected with the pressure sensor through electric wires. According to the device for measuring the acting force change of the soil body in front of the shield tunneling machine, the soil pressure gauge is arranged in the advancing direction of the shield tunneling machine, data monitoring can be carried out on tunneling of the shield tunneling machine in the soil body and the extrusion effect on the surrounding soil body, the current construction state of the soil body is judged by observing the reading change of the soil pressure gauge, corresponding measures are taken, and the working efficiency of the shield tunneling machine is improved. Real-time monitoring and maintenance can be achieved, and the safety of tunnel construction is guaranteed.

Description

Technical Field

[0001] The utility model belongs to the field of building construction, and in particular relates to a device for measuring changes in the force of a shield machine and a double-tunnel shield machine on a front soil body. Background Art

[0002] In recent years, with the rapid development of shield technology in my country, shield construction technology has become the main construction method for building underground intercity railway tunnels. Under good geological conditions and relatively stable surrounding rock, the shield machine excavates through the earth pressure balance mode.

[0003] When the shield tunnels in the soil, it will have a squeezing effect on the surrounding soil, and then when it moves away from the soil, it will cause a relaxation effect on the surrounding soil. Under this effect, the soil will be disturbed, which will in turn have a certain impact on underground pile foundations, culverts, existing lines, caves, as well as ground structures and municipal roads. In severe cases, it will cause cracks and collapse of surrounding structures, damage to nearby pipelines, and collapse of municipal roads.

[0004] Nowadays, cities have increasingly higher requirements for environmental protection, and the surrounding disturbance caused by shield construction is becoming increasingly prominent. However, the domestic research on soil stress and strain caused by earth pressure balance shield machines remains in the laboratory or theoretical model stage, and no actual quantitative data has been given. The measurement equipment and methods are also still unclear. Utility Model Content

[0005] The utility model aims to overcome the shortcomings of the prior art and provide a device for measuring the change of the force exerted by a shield machine and a double-tunnel shield machine on the front soil.

[0006] In order to achieve the above purpose, the technical solution adopted by the utility model is:

[0007] A device for measuring the change of soil force in front of a shield machine comprises a plurality of soil pressure gauges; each soil pressure gauge comprises a square tube, a pressure sensor arranged on the square tube, and a wireless strain sensor gateway and a solar panel connected to the pressure sensor through wires.

[0008] The electric wires are arranged in the square tube.

[0009] The wireless strain sensor gateway and the solar panel are both arranged on the ground.

[0010] One or more pressure sensors are arranged on the square tube; the arrangement positions of the pressure sensors are the same or different.

[0011] The utility model also comprises a device for measuring the change of soil force in front of a double-tunnel shield machine, comprising the device; the device is arranged in the traveling direction of two shield machines.

[0012] The square tubes are arranged in double rows front and back in the traveling direction of the two shield machines.

[0013] A square tube is arranged in each row on the axis of the shield machine, and an additional square tube is arranged between the double rows of square tubes.

[0014] There are five square tubes in each row between two shield machines.

[0015] Compared with the prior art, the beneficial effects of the utility model are:

[0016] The utility model discloses a device for measuring the change of the force of the soil in front of the shield machine, by arranging an earth pressure gauge in the traveling direction of the shield machine, so as to monitor the data of the squeezing effect of the shield machine on the surrounding soil when it excavates in the soil. By observing the change of the earth pressure gauge reading, the current construction status of the soil can be judged and corresponding measures can be taken, so that real-time monitoring and maintenance can be achieved, and the safety of tunnel construction can be guaranteed. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 Schematic diagram of the device structure for measuring the change of soil force in front of the double tunnel shield machine. DETAILED DESCRIPTION

[0018] In order to enable those skilled in the art to better understand the technical solution of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and the best embodiment.

[0019] A device for measuring the change of soil force in front of a shield machine, comprising a plurality of soil pressure gauges; each soil pressure gauge comprises a square tube 3, a pressure sensor 4 arranged on the square tube, and a wireless strain sensor network 2 connected to the pressure sensor via wires and a solar panel 1. The wires (not shown) are arranged in the square tube 3.

[0020] The wireless strain sensor gateway 2 and the solar panel 1 are both arranged on the ground 6. One or more pressure sensors 4 are arranged on each of the square tubes 3; the arrangement positions of the pressure sensors are the same or different.

[0021] The utility model also includes a device for measuring the change of soil force in front of the double tunnel shield machine ( Figure 1 Shown), which includes the device; the device is arranged in the travel direction of two shield machines.

[0022] As a preferred embodiment, the square tubes 3 are arranged in double rows in the travel direction of two shield machines 10 (one is shown in the figure). One square tube is arranged in each row on the axis of the shield machine (including the axis of the first shield machine 8 and the axis of the second shield machine 9), and one square tube is added between the double rows of square tubes. Five square tubes are arranged in each row between the two shield machines.

[0023] The device of the present application is used to measure the change of soil force in front of the double tunnel shield machine, which specifically includes the following steps:

[0024] (1) Surveying and laying out: GPS is used to carry out field laying out according to the hole layout plan of the pressure sensor (earth pressure gauge). The holes are arranged in two rows in the travel direction of the two shield machines. There are 16 holes in total. The 1-7# holes are in the same straight line and perpendicular to the tunnel axis. The 8-14# holes are in the same straight line and perpendicular to the tunnel axis. Two more holes, 15-16#, are added in the tunnel along the shield machine axis. In the two rows of holes, the hole spacing at the tunnel axis is 1m, and the hole spacing between tunnels is 2m.

[0025] (2) Drilling and laying pipes: The earth pressure gauge slot is constructed with a geological drill and core samples are extracted. The core samples are photographed and preserved. The hole diameter is 130 mm, and the depth is 0.5 m from the bottom of the tunnel to the bottom plane 7. After the drilling is completed, a 110 mm diameter PVC pipe is immediately installed to the bottom of the hole to protect the wall and prevent the hole wall from collapsing. Before drilling, determine whether there is a pipeline under the hole. If the hole must be moved to avoid it, all the holes are moved horizontally, and the relative positions between the holes remain unchanged.

[0026] (3) Lowering the soil pressure gauge: A single soil pressure gauge consists of a pressure sensor 4, wires, a square tube 3, a solar panel 1, and a wireless strain sensor gateway 2. The pressure sensor has a range of -0.1MPa to 60MPa. Each sensor measures data in one direction. According to the measurement direction, depth, and quantity requirements, it needs to be fixed to the square tube in a certain direction and position to prevent it from falling off. The square tube is made of PVC, with a side length of 3cm, a thickness of 1.5mm, a single-sided opening, and a section of 1m, which is convenient for transportation and lowering. The wires are buried in the square tube and tied firmly. The wireless strain sensor gateway uses the Shanghai Hangding AZ286E model, with a built-in antenna, and a real-time data transmission range of not less than 2km. The working voltage of the solar panel is 12V, and the power is not less than 100W. Before lowering the soil pressure gauge, the sensor measurement direction must be confirmed to avoid rework.

[0027] (4) Slurry sealing: After the soil pressure gauge is installed, the hole is sealed. Cement-water glass double liquid slurry is used in the PVC pipe. The cement is 42.5 grade ordinary Portland cement. The water-cement ratio of the cement slurry is 1:1. The water glass is diluted with water to a concentration of 19Be. The cement slurry: water glass = 4:1, and the initial setting time of the double liquid slurry is 40-45s. Straighten the grouting hose to the bottom of the hole, plug and pull while grouting, and pay attention to the plugging and pulling force at all times to prevent the pipe from being buried. The gap between the PVC pipe and the hole wall is filled with cement slurry to ensure that there is no void.

[0028] (5) Data feedback and analysis: After installation, the earth pressure meter can measure data by itself. The observation frequency should be increased 20 m in front of the earth pressure meter. The data should be transmitted to the computer for data collation and analysis.

[0029] To sum up, the device for measuring the change of the soil force in front of the shield machine of the utility model can monitor the data of the shield excavating in the soil and the squeezing effect on the surrounding soil by setting an earth pressure gauge in the traveling direction of the shield machine. By observing the changes in the earth pressure gauge reading, the current construction status of the soil can be judged and corresponding measures can be taken, so that real-time monitoring and maintenance can be achieved to ensure the safety of tunnel construction.

[0030] The above is only a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the protection scope of the present invention.

Claims

1. A device for measuring the change of the force exerted by a shield machine on the soil ahead, characterized in that: It comprises a plurality of soil pressure gauges; each soil pressure gauge comprises a square tube, a pressure sensor arranged on the square tube, and a wireless strain sensor gateway and a solar panel connected to the pressure sensor through wires.

2. The device for measuring the change of the shield machine's force on the soil ahead according to claim 1, characterized in that: The electric wires are arranged in the square tube.

3. The device for measuring the change of the shield machine's force on the soil ahead according to claim 1, characterized in that: The wireless strain sensor gateway and the solar panel are both arranged on the ground.

4. The device for measuring the change of the shield machine's force on the soil ahead according to claim 1, characterized in that: One or more pressure sensors are arranged on the square tube; the arrangement positions of the pressure sensors are the same or different.

5. A device for measuring the change of the force exerted by a double tunnel shield machine on the soil ahead, characterized in that: The invention comprises the device described in any one of claims 1 to 4; the device is arranged in the travel direction of two shield machines.

6. The device for measuring the change of the force exerted by the double tunnel shield machine on the soil ahead according to claim 5, characterized in that: The square tubes are arranged in double rows front and back in the traveling direction of the two shield machines.

7. The device for measuring the change of the force exerted by the double tunnel shield machine on the soil ahead according to claim 6, characterized in that: A square tube is arranged in each row on the axis of the shield machine, and an additional square tube is arranged between the double rows of square tubes.

8. The device for measuring the change of the force exerted by the double tunnel shield machine on the soil ahead according to claim 7, characterized in that: There are five square tubes in each row between two shield machines.

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