A shield tunnel synchronous grouting segment floating device and a use method thereof

Abstract

The present application relates to a kind of measuring floating amount device field, more particularly to a kind of simulation shield tunnel segment floating device and use method, including model box, for containing soil body, simulation shield machine is arranged in the model box, the simulation shield machine includes shell, several segments are arranged in shell, the segment between each other is spliced and forms long barrel, power device is arranged outside the model box, for pulling shell moves along the axial direction of segment, floating detection device is arranged on the segment, for detecting the floating amount of each segment, grouting device is arranged outside the side of model box, for injecting slurry between shell and segment, at least one side of model box is spliced by transparent acrylic plate, transparent acrylic plate is connected with model box by hinge and buckle, shell is pulled using power device, the movement of simulation shield machine, the floating amount of each segment is measured, so that it can be more in line with actual situation.

Description

Technical Field

[0001] This invention relates to a device for measuring buoyancy, and more specifically to a method of using a shield tunnel segment buoyancy device. Background Technology

[0002] With the increase in urban population density and rapid economic development, urban traffic pressure is increasing. Making full use of underground space to build subways is an effective way to alleviate urban traffic. Among them, shield tunneling is widely used in urban subway tunnel construction because of its safety, high efficiency and strong applicability.

[0003] During shield tunneling, there will be a certain gap between the shield tail assembly segments and the stratum. If measures are not taken in time, the segments will be misaligned, and the stratum will also deform due to insufficient support. Among the corresponding treatment measures, the most critical one is to inject grout into the gap between the lining ring behind the shield tail and the stratum to effectively fill it.

[0004] After synchronous grouting, due to the high density of the grout and the time required for solidification, the buoyancy force and grouting pressure on the tunnel segments are much greater than their own weight. This provides upward buoyancy for the tunnel segments, and the existence of the shield tail gap provides upward space for the segments. During the construction of large-diameter shield tunnels, the construction risks caused by segment floating, such as segment misalignment, water leakage at pipe joints, and axis deviation, are becoming increasingly significant. If these problems are not taken seriously, they will seriously endanger construction safety. Therefore, accurately measuring the floating amount of tunnel segments during synchronous grouting in shield tunnels is an urgent problem to be solved. Existing simulation devices usually study a single ring of tunnel segments or use a complete cylinder to simulate an entire tunnel segment. They cannot accurately simulate the interaction between segments or between rings of segments caused by grouting. Using the method of adjusting the pressure of airbags between the soil and the segments to inject grout into the airbags to simulate synchronous grouting cannot realistically simulate the interaction between the grout and the soil after the shield tail gap is generated, and cannot reflect the actual diffusion process of the grout. Summary of the Invention

[0005] The technical problem this invention aims to solve is that the process of reflecting the upward movement of the shield tail of a tunnel boring machine cannot accurately reflect the actual situation.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution:

[0007] First, a device for simulating the floating of grouting segments in a shield tunnel is provided, comprising a model box, an outer shell inside the model box, and several segments inside the outer shell. The segments are characterized in that they are spliced ​​together to form a long cylindrical shape. A power device is installed outside the model box to pull the outer shell. Each segment is equipped with a floating detection device to detect the floating amount of each segment. A grouting device is installed on the outside of the model box to inject grout between the outer shell and the segments. At least one side of the model box is made of transparent acrylic panels spliced ​​together, and the transparent acrylic panels are connected to the model box via hinges and fasteners.

[0008] Furthermore, a fixing guide rod is installed at the position corresponding to the tube segment inside the model box, and a fixing ring is installed on the fixing guide rod, with the tube segment at the end connected to the fixing ring.

[0009] Furthermore, the fixed guide rod penetrates the center of the long cylindrical shape formed by splicing the segments.

[0010] Furthermore, the buoyancy detection device includes a total reflection prism and a laser rangefinder. A total reflection prism is installed on the fixed guide rod at the position corresponding to each section of the tube, and a laser rangefinder is installed on each section of the tube.

[0011] Furthermore, a pressure box is installed inside the model box to detect soil pressure, and a water level gauge is installed inside the model box to detect the soil moisture content.

[0012] A device for simulating the floating of synchronously grouted segments in a shield tunnel and its usage method, including:

[0013] S1: Insert the segments into the outer casing;

[0014] S2: Fill the model box with soil;

[0015] S3: Record the initial distance of the buoyancy detection device;

[0016] S4: The grouting device works to inject grout between the outer shell and the segments;

[0017] S5: The power unit pulls the outer shell to move;

[0018] S6: The laser rangefinder detects the buoyancy in real time.

[0019] S7: Wait for the slurry to solidify before proceeding with further processing;

[0020] Furthermore, in S1, the tube segment is spliced ​​together with 1*22.5° and 5*67.5° segments, and the tube segments are spliced ​​together with a staggered joint of 45°.

[0021] Furthermore, in S2, pressure cells and water level gauges are used to adjust the parameters of the soil.

[0022] Furthermore, in S5, the speed at which the power unit pulls the outer shell is close to the actual moving speed of the tunnel boring machine during the process.

[0023] Furthermore, in S7, the model box is opened by a buckle and a hinge to remove the soil for future use.

[0024] The present invention has the following beneficial effects:

[0025] First, the movement of the tunnel boring machine during actual operation is simulated by pulling the outer shell with a power unit. Then, each segment is measured to ensure the diversity and accuracy of the data, which can be closer to the actual working process and better reflect the physical quantities in the actual working process.

[0026] Second, by using earth pressure cells and water level gauges to adjust soil parameters to more closely resemble the soil conditions during actual work, calculations and designs can be performed in advance, ensuring greater stability and reliability during construction.

[0027] Third, by measuring each segment of the tunnel, we can know the amount of land settlement during actual operation, analyze the impact on the upper soil during actual processing, and reduce the occurrence of safety accidents. Attached Figure Description

[0028] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0029] Figure 1 This is a schematic diagram of the structure of this embodiment;

[0030] Figure 2 This is a three-dimensional structural diagram of this embodiment;

[0031] Figure 3 This is a schematic diagram of the segment structure in this embodiment;

[0032] Figure 4 This is a schematic diagram of the buoyancy detection device in this embodiment. Detailed Implementation

[0033] To better explain and facilitate understanding of the present invention, the present invention will be described in detail below with reference to the accompanying drawings and specific embodiments.

[0034] It should be noted that all directional indications in the embodiments of the present invention are only used to explain the relative positional relationship and movement of the components in a specific posture. If the specific posture changes, the directional indications will also change accordingly.

[0035] Furthermore, in this invention, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0036] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0037] This invention provides a device for simulating the floating of synchronously grouted segments in a shield tunnel, such as... Figure 1 and Figure 3 As shown, the model box includes a model box 1, an outer shell 41 is provided inside the model box 1, and several segments 31 are provided inside the outer shell 41. The characteristic is that the segments 31 are spliced ​​together to form a long cylindrical shape. A power device is provided outside the model box 1 for pulling the outer shell 41 to move. Each segment 31 is provided with a floating detection device for detecting the floating amount of each segment 31. A grouting device is provided outside the model box 1 for injecting grout between the outer shell 41 and the segments 31. At least one side of the model box 1 is spliced ​​from transparent acrylic sheets, and the transparent acrylic sheets are connected to the model box 1 by hinges and buckles.

[0038] Specifically, in this embodiment, a power device is used to pull the outer shell 41 to move, simulating the movement of the tunnel boring machine (TBM) to better reflect actual conditions. The grouting device is used to simulate the measures taken to prevent segment misalignment during the actual operation of the TBM. The movement of the outer shell 41 exposes the segments 31 located inside, filling the space between the segments 31 and the soil with grout, thus preventing segment misalignment. During the solidification of the grout, the segments 31 are subjected to buoyancy, causing them to float. Since the segments 31 are spliced ​​together, the amount of floating between each segment 31 is different. To better cope with the floating of segments in actual processes, a floating detection device is used to measure each segment 31 during the simulation test, ensuring that it can cope with various situations in actual processes and improving the effectiveness of the simulation test. Before the test, the floating detection device is used to measure the segments and record their initial positions. The model box 1 can be easily disassembled through a transparent acrylic plate, making it convenient to operate the device.

[0039] like Figure 2 and Figure 4 As shown, a fixing guide rod 52 is installed at the position corresponding to the tube segment 31 inside the model box 1, and a fixing ring 51 is installed on the fixing guide rod 52. The tube segment 31 at the end is connected to the fixing ring 51.

[0040] Specifically, in this embodiment, during the simulation test, in order to prevent the tube segment 31 from moving during the pulling of the outer shell 41, which would lead to inaccurate test results, a fixing guide rod 52 is fixedly installed on the model box 1, and a fixing ring 51 is installed on the fixing guide rod 52. The fixing ring 51 is used to fix the tube segment 31 located at the outermost end, thereby ensuring that the entire tube segment 31 is located inside the model box 1 and will not move out on its own, which is beneficial to the conduct of this test.

[0041] like Figure 4 As shown, the fixed guide rod 52 passes through the center of the long cylindrical shape formed by splicing the segments 31. The floating detection device includes a total reflection prism 53 and a laser rangefinder 54. A total reflection prism 53 is installed on the fixed guide rod 52 at the position corresponding to each segment 31, and a laser rangefinder 54 is installed on each segment 31.

[0042] Specifically, in this embodiment, total reflection prisms 53 are installed on the fixed guide rod 52 at positions corresponding to the tube segment 31. Under the action of the fixing ring 51, the tube segment 31 will not move out. Therefore, during subsequent measurement, the total reflection prism 53 will always be aligned with the corresponding laser rangefinder 54 without misalignment, which facilitates subsequent data processing and collection and improves work efficiency.

[0043] like Figure 2As shown, a pressure box 62 is installed inside the model box 1 to detect soil pressure, and a water level gauge 63 is installed inside the model box 1 to detect soil moisture content. In this embodiment, the pressure box 62 is used to detect soil compaction, and the water level gauge 63 is used to detect soil moisture. Using the pressure box 62 and the water level gauge 63 to detect soil parameters makes it more consistent with the soil conditions during the actual operation of the tunnel boring machine.

[0044] The present invention also provides a device for simulating the floating of synchronous grouting segments in a shield tunnel and a method for using it, the specific steps of which are as follows:

[0045] S1: Insert the segment 31 into the outer shell 41;

[0046] S2: Fill the model box 1 with soil;

[0047] S3: Record the initial distance of the buoyancy detection device;

[0048] S4: The grouting device works to inject grout between the outer shell 41 and the segment 31;

[0049] S5: The power unit pulls the outer casing 41 to move;

[0050] S6: The laser rangefinder detects the buoyancy in real time.

[0051] S7: Wait for the slurry to solidify before proceeding with further processing;

[0052] Specifically, in this embodiment, the segments 31 are installed one by one, and then the end segments 31 are installed on the fixing ring 51. Then, the floating detection device is activated to first measure the position of the segments 31 before the test and record the initial position distance for comparison with subsequent data. After preparation, soil is filled into the model box 1 to simulate the working environment of the tunnel boring machine. The selected soil can be the actual soil used by the tunnel boring machine or a similar soil to better reflect the actual situation. Then, the grouting device is activated, and the grout flows into the outer shell 41 and... Between the tunnel segments 31, the grouting process is simulated in real time during the actual operation of the tunnel boring machine. After grouting begins, the power unit pulls the outer shell 41 to move, simulating the movement of the tunnel boring machine during operation. During this process, the tunnel segments 31 may float due to the buoyancy of the grout. The laser rangefinder detects the amount of floating of the tunnel segments 31 in real time. After the outer shell is completely removed, the power unit and the grouting device stop working. The grout, which is in a liquid state, is allowed to cool and solidify. Finally, the model box 1 is opened.

[0053] Specifically, in step S1, the segment 31 is spliced ​​together with 1*22.5° and 5*67.5° segments, and the segments 31 are spliced ​​together with a 45° stagger to prevent grout from seeping in.

[0054] Similarly, in step S2, the pressure box 62 and water level gauge 63 are used to adjust the soil parameters to meet the actual requirements. Specifically, in this embodiment, the pressure box 62 is used to measure the compactness of the soil, and the water level gauge 63 is used to measure the moisture content of the soil. When the moisture is insufficient, water can be added. When the soil is higher than the expected value, it can be dried. Only when both the pressure box 62 and the water level gauge 63 meet the requirements can the next step be carried out.

[0055] Specifically, in this embodiment, in step S5, the power device pulls the outer shell 41 at a speed close to the actual speed of the tunnel boring machine, so that the test results are closer to the actual process, ensuring a smoother and more efficient construction process.

[0056] Specifically, in step S7, the model box 1 is opened using buckles and hinges to remove the soil and solidified grout, making it easier to take out the equipment for the next use.

[0057] In this embodiment, since a laser rangefinder 54 is used, the time it takes for the laser rangefinder 54 to receive the reflected laser is recorded as t0. After the test, the time it takes to receive the reflected laser is t1, so the upward displacement is...

[0058]

[0059] This is used to measure the uplift of each segment 31. After that, data analysis can determine the impact of the shield tunnel on the upper soil, helping users to better plan the construction.

[0060] It should be understood that the above description of specific embodiments of the present invention is only for illustrating the technical approach and features of the present invention, and is intended to enable those skilled in the art to understand the content of the present invention and implement it accordingly. However, the present invention is not limited to the specific embodiments described above. All changes or modifications made within the scope of the claims of the present invention should be covered within the protection scope of the present invention.

Claims

1. A device for simulating the floating of grouting segments in a shield tunnel, comprising a model box (1), wherein an outer shell (41) is disposed inside the model box (1), and a plurality of segments (31) are disposed inside the outer shell (41), characterized in that, The segments (31) are spliced ​​together to form a long cylinder. A power device is installed outside the model box (1) to pull the outer shell (41) to move. A floating detection device is installed on each segment (31) to detect the floating amount of each segment (31). A grouting device is installed on the outside of the model box (1) to inject grout between the outer shell (41) and the segments (31). At least one side of the model box (1) is spliced ​​from transparent acrylic sheets. The transparent acrylic sheets are connected to the model box (1) by hinges and buckles. A fixed guide rod (52) is installed in the model box (1) at the position corresponding to the tube segment (31). A fixed ring (51) is installed on the fixed guide rod (52), and the tube segment (31) at the end is connected to the fixed ring (51). The fixed guide rod (52) passes through the center of the long cylindrical shape formed by splicing the tube segments (31). The floating detection device includes a total reflection prism (53) and a laser rangefinder (54). A total reflection prism (53) is installed on the fixed guide rod (52) at the position corresponding to each tube segment (31), and a laser rangefinder (54) is installed on each tube segment (31).

2. The device for simulating synchronous grouting segment floating in a shield tunnel according to claim 1, characterized in that, A pressure box (62) is installed inside the model box (1) to detect soil pressure, and a water level gauge (63) is installed inside the model box (1) to detect the water content of the soil.

3. A method of using the simulated shield tunnel synchronous grouting segment floating device as described in any one of claims 1-2, characterized in that, include S1: The segments (31) are spliced ​​and placed inside the outer shell (41); S2: Fill the model box (1) with soil; S3: Record the initial distance of the buoyancy detection device; S4: The grouting device works to inject grout between the outer shell (41) and the segment (31); S5: The power unit pulls the outer shell (41) to move; S6: Laser rangefinder detects buoyancy in real time; S7: Wait for the slurry to solidify before proceeding with further processing.

4. The method of using the simulated shield tunnel synchronous grouting segment floating device according to claim 3, characterized in that, In S1, the tube segment (31) is spliced ​​together with 1*22.5° and 5*67.5°, and the tube segments (31) are spliced ​​together with a staggered seam of 45°.

5. The method of using the simulated shield tunnel synchronous grouting segment floating device according to claim 3, characterized in that, In S2, the parameters of the soil are adjusted using a pressure cell (62) and a water level gauge (63).

6. The method of using the simulated shield tunnel synchronous grouting segment floating device according to claim 3, characterized in that, In S5, the power device pulls the outer shell (41) at a speed close to the actual speed of the tunnel boring machine.

7. The method of using the simulated shield tunnel synchronous grouting segment floating device according to claim 3, characterized in that, In S7, the model box (1) is opened by buckle and hinge to remove the soil for future use.

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