System and method for measuring shield tail clearance

Abstract

The present invention relates to a system for measuring the gap between the shield tail, the gap between the shield tail is formed between the inner wall of the shield tail and the outer wall of the corresponding pipe segment, and the measuring system comprises: a cavity opened in the shield tail, the cavity is connected with the gap between the shield tail; a catheter assembly slidably arranged in the cavity, having a first end and a second end, the first end is arranged in the cavity, and the second end is arranged in the gap between the shield tail; a driving mechanism arranged in the cavity, the driving mechanism applies a driving force to the first end to push the catheter assembly outside the cavity, so that the second end is tightly against the outer wall of the pipe segment; an elastic member arranged on the first end; and a tension sensor fixedly connected to the elastic member; when the gap between the shield tail changes, the corresponding movement of the catheter assembly in the cavity causes the elastic member to deform, the elastic force value of the elastic member is measured by the tension sensor, and the gap between the shield tail is calculated according to the elastic force value. The problem that the non-contact measurement method is easily affected by the external environment is avoided, so that the measurement data is more accurate.

Description

Technical Field

[0001] The invention relates to the technical field of shield machines, and in particular to a system for measuring a shield tail gap and a measuring method thereof. Background Art

[0002] my country is becoming the country with the largest demand for tunnel boring machines in the world, and shield tunnel boring machines represent the development direction of tunnel boring equipment. Since shield machine construction is a high-risk industry, product quality stability and high reliability must be guaranteed to ensure the smooth completion of the project. During the tunneling process of the shield machine, it is necessary to measure the shield tail gap in real time to control and correct the tunneling posture of the shield machine. Since the shield tail and the segment are in relative motion, the existing technology usually uses a non-contact measurement method to measure the shield tail gap. For example, an optical instrument is used to measure the distance of the shield tail gap through visual recognition and conversion, but such a non-contact measurement method is easily affected by the external environment, resulting in a large measurement error of the shield tail gap. Since there are many burrs on the outer wall of the segment, the outer wall of the segment will cause wear on the inner wall of the shield tail when it contacts the inner wall of the shield tail.

[0003] Therefore, there is an urgent need to provide a system and a measuring method for measuring the shield tail gap, which can measure the gap more accurately and avoid the wear of the inner wall of the shield tail by burrs on the pipe segment, so as to solve the above technical problems. Summary of the invention

[0004] The purpose of the present invention is to overcome the defects of the prior art and provide a system and a measuring method for measuring the shield tail gap, so as to solve the problem that the shield tail gap measured by the existing shield tail gap measurement method has a large error and the burrs on the pipe segment wear the inner wall of the shield tail.

[0005] To achieve the above object, the present invention provides a system for measuring the shield tail gap, wherein the shield tail gap is formed between the inner wall of the shield tail and the outer wall of the corresponding segment, and the measuring system comprises:

[0006] A cavity is provided in the shield tail, the arrangement direction of the cavity is consistent with the length direction of the shield tail, and the cavity is connected with the gap of the shield tail;

[0007] A catheter assembly slidably disposed in the cavity, comprising a first end and a second end, wherein the first end is disposed in the cavity and the second end is disposed in the shield tail gap;

[0008] A driving mechanism disposed in the cavity, the driving mechanism applying a driving force to the first end to push the catheter assembly out of the cavity so that the second end is tightly against the outer wall of the tube segment;

[0009] an elastic member disposed on the first end; and

[0010] A tension sensor fixedly connected to a side of the elastic member away from the first end;

[0011] When the shield tail gap changes, the catheter assembly moves correspondingly in the cavity to deform the elastic member, the elastic force value of the elastic member is measured by the tension sensor, and the shield tail gap is calculated according to the elastic force value.

[0012] The present invention drives the catheter assembly to move through a driving mechanism so that the catheter assembly partially extends out of the cavity and is tightly against the outer wall of the tube segment. When the shield tail gap becomes larger, the driving mechanism drives the catheter assembly to move out of the cavity so that the elastic member is stretched; when the shield tail gap becomes smaller, the tube segment catheter assembly moves into the cavity so that the elastic member is shortened; the elastic force value of the elastic member is measured by a tension sensor, and the deformation of the elastic member can be calculated according to the elastic force value, thereby calculating the shield tail gap, thereby avoiding the problem that the non-contact measurement method used in the prior art is easily affected by the external environment, making the measurement data more accurate. The driving mechanism applies a driving force to push the catheter assembly out of the cavity and tightly against the outer wall of the tube segment, so that under the supporting action of the catheter assembly, a certain distance of gap can always be maintained between the inner wall of the shield tail and the outer wall of the tube segment, thereby avoiding the burrs on the outer wall of the tube segment from wearing the inner wall of the shield tail.

[0013] A further improvement of the system for measuring the shield tail gap of the present invention is that the catheter assembly includes an elastic catheter and a slide fixed to one end of the catheter, the slide is placed in the cavity and can slide along the inner wall of the cavity;

[0014] The conduit is partially placed in the cavity and partially located in the shield tail gap.

[0015] A further improvement of the system for measuring the shield tail gap of the present invention is that the driving mechanism includes a pressure chamber formed in the cavity and in a sealed state and a medium filled in the pressure chamber;

[0016] The slide plate is communicated with the pressure chamber, and a driving force for pushing the slide plate is formed by filling a medium into the pressure chamber.

[0017] A further improvement of the system for measuring the shield tail gap of the present invention is that the pressure chamber is connected to a pipeline, a pressurizing component is provided on the pipeline, and the pressure chamber is pressurized by the pressurizing component.

[0018] A further improvement of the system for measuring the shield tail clearance of the present invention is that a mounting hole is provided on the inner wall of the shield tail corresponding to the pressure chamber;

[0019] A mounting seat is fixedly mounted at the mounting hole;

[0020] The tension sensor is fixed on the mounting seat and is located in the pressure chamber.

[0021] A further improvement of the system for measuring the shield tail gap of the present invention is that an L-shaped guide tube is provided in the cavity, the catheter is inserted in the guide tube, the guide tube includes a first guide portion whose setting direction is perpendicular to the inner wall of the shield tail and a second guide portion whose setting direction is consistent with the length direction of the shield tail, and the catheter can be kept straight when moving through the first guide portion and the second guide portion.

[0022] A further improvement of the system for measuring the shield tail gap of the present invention is that it also includes a PLC that is communicatively connected to the tension sensor, and the PLC receives the elastic force value sent by the tension sensor and then obtains the corresponding shield tail gap through calculation.

[0023] The present invention also provides a method for measuring the shield tail clearance system as described above, comprising the following steps:

[0024] The cavity is provided on the inner wall of the shield tail;

[0025] installing the catheter assembly in the cavity;

[0026] Installing and fixing the elastic member on the catheter assembly;

[0027] The tension sensor is fixedly connected to the elastic member;

[0028] The driving mechanism is installed in the cavity, and the elastic force value of the elastic member is measured by the tension sensor. The deformation amount of the elastic member can be calculated according to the elastic force value, thereby calculating the shield tail gap.

[0029] A further improvement of the measuring method of the system for measuring the shield tail gap of the present invention is that it also includes the following steps:

[0030] A PLC is provided which is in communication with the tension sensor. The PLC receives the elastic force value sent by the tension sensor and then obtains the corresponding shield tail gap through calculation.

[0031] A further improvement of the measuring method of the system for measuring the shield tail gap of the present invention is that it also includes the following steps:

[0032] A plurality of pairs of systems for measuring the shield tail gap are evenly distributed on the inner wall of the shield tail corresponding to the outer wall of the segment, and a plurality of groups of shield tail gap data at a plurality of different positions of the shield tail gap are measured by the plurality of pairs of systems for measuring the shield tail gap. By comparing and analyzing each group of shield tail gap data, it is concluded whether the segment is accurately assembled. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 The schematic diagram of the installation of the system for measuring the shield tail gap of the present invention is installed on the shield tail.

[0034] Figure 2 for Figure 1 A partial enlarged schematic diagram of area A in the middle. DETAILED DESCRIPTION

[0035] In order to make the purpose, technical scheme and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0036] The present invention provides a system and a measuring method for measuring the shield tail gap, which are used to measure the shield tail gap, and the shield tail gap is formed between the inner wall of the shield tail and the outer wall of the corresponding pipe segment. The present invention includes a cavity, a duct assembly, an elastic member and a tension sensor. The duct assembly is driven by a driving mechanism to move so that the duct assembly part extends out of the cavity and is tightly against the outer wall of the pipe segment. When the shield tail gap becomes larger, the driving mechanism drives the duct assembly to move out of the cavity, so that the elastic member is stretched; when the shield tail gap becomes smaller, the pipe segment duct assembly moves into the cavity, so that the elastic member is shortened; the elastic force value of the elastic member is measured by the tension sensor, and the deformation of the elastic member can be calculated according to the elastic force value, so as to calculate the shield tail gap, thereby avoiding the problem that the non-contact measurement method used in the prior art is easily affected by the external environment, so that the measurement data is more accurate. The driving mechanism applies a driving force to push the duct assembly out of the cavity and press it against the outer wall of the segment, so that a certain distance of gap can always be maintained between the inner wall of the shield tail and the outer wall of the segment under the supporting action of the duct assembly, thereby preventing the burrs on the outer wall of the segment from wearing the inner wall of the shield tail.

[0037] The system and method for measuring the shield tail gap of the present invention are described below in conjunction with the accompanying drawings.

[0038] See also Figure 1 and Figure 2 , Figure 1 The schematic diagram of the installation of the system for measuring the shield tail gap of the present invention on the shield tail is shown. Figure 2 Shows Figure 1A partial enlarged schematic diagram of the area A in the middle. In this embodiment, a system for measuring the gap of the shield tail 6 is provided. The gap of the shield tail 6 is formed between the inner wall of the shield tail 6 and the outer wall of the corresponding pipe segment 7. The measuring system includes: a cavity 5 opened in the shield tail 6, a catheter assembly slidably arranged in the cavity 5, a driving mechanism arranged in the cavity 5, an elastic member 2 and a tension sensor 3. The setting direction of the cavity 5 is consistent with the length direction of the shield tail 6. The cavity 5 is connected with the gap of the shield tail 6. The catheter assembly has a first end and a second end. The first end is placed in the cavity 5 and the second end is placed in the gap of the shield tail 6. The elastic member 2 is arranged on the first end. The tension sensor 3 is fixedly connected to the side of the elastic member 2 away from the first end. The tension sensor 3 is used to measure the elastic force of the elastic member 2. The driving mechanism applies a driving force to the first end to push the catheter assembly out of the cavity 5 so that the second end is tightly against the outer wall of the pipe segment 7. When the gap of the shield tail 6 changes, the catheter assembly moves correspondingly in the cavity 5, thereby causing the elastic member 2 to deform. The elastic force value of the elastic member 2 is measured by the tension sensor, and the shield tail gap is calculated based on the elastic force value.

[0039] The measuring device in this embodiment uses a contact measurement method to measure the gap of the shield tail 8. The catheter assembly has a first end that can slide along the inner wall of the cavity 5 and a second end that is away from the first end and extends out of the cavity 5. The driving mechanism drives the first end to move in the direction of the second end, so that the second end is tightly against the outer wall of the pipe segment 7. When the gap of the shield tail 6 becomes larger, the driving mechanism drives the first end to move in the direction of the second end, thereby pushing the catheter assembly to move out of the cavity 5, so that the elastic member 2 is stretched and the elastic force of the elastic member 2 changes; when the gap of the shield tail becomes smaller, the pipe segment 7 pushes the second end to move in the direction of the first end, thereby pushing the catheter assembly to move into the cavity 5, so that the elastic member 2 is shortened and the elastic force of the elastic member 2 changes. The elastic force value of the elastic member 2 is measured by the tension sensor 3, and the deformation of the elastic member 2 can be calculated according to the elastic force value, thereby calculating the gap of the shield tail 6, thereby avoiding the problem that the non-contact measurement method used in the prior art is easily affected by the external environment, making the measurement data more accurate. The driving mechanism drives the catheter assembly to press against the outer wall of the pipe segment 7, so that a certain distance can always be maintained between the inner wall of the shield tail 6 and the outer wall of the pipe segment 7 under the supporting action of the catheter assembly, thereby preventing the burrs on the outer wall of the pipe segment 7 from wearing the inner wall of the shield tail 6.

[0040] Specifically, the elastic member 2 is a spring, and the length of the catheter 11 extending out of the cavity 5 is calculated by calculating the elongation or shortening of the spring.

[0041] See also Figure 2In one embodiment, the catheter assembly includes an elastic catheter 11 and a slide plate 12 fixed to one end of the catheter 11. The slide plate 12 is placed in the cavity 5 and can slide along the inner wall of the cavity 5. The catheter 11 is partially placed in the cavity 5 and partially located in the gap of the shield tail 6. The driving mechanism drives the slide plate 12 to slide along the inner wall of the cavity 5, thereby pushing the catheter 11 to move in the cavity, so that the end of the catheter 11 away from the slide plate 12 extends out of the cavity 5 and is tightly against the outer wall of the pipe segment 7.

[0042] See also Figure 2 Furthermore, the driving mechanism includes a pressure chamber 51 formed in the cavity 5 and sealed, and a medium filled in the pressure chamber 51. The slide 12 is connected to the pressure chamber 51, and the medium is filled into the pressure chamber 51 to form a driving force to push the slide 12. Specifically, the medium is gas, hydraulic oil, water or other liquids. In a specific embodiment, the pressure chamber 51 is filled with gas to form a driving force to push the slide 12, and the slide 12 is pushed to move in the direction of the second end by the air pressure, so that the second end is tightly against the outer wall of the tube segment 7. The air pressure in the pressure chamber 51 pushes the slide 12 to move, so that the conduit 11 can move and abut against the outer wall of the tube segment 7. Under the action of the conduit 11, a certain distance is always maintained between the inner wall of the shield tail 6 and the outer wall of the tube segment 7. Since there are many burrs on the outer wall of the tube segment 7, the gap can prevent the burrs from wearing the inner wall of the shield tail 6.

[0043] Furthermore, the pressure chamber 51 is connected to a pipeline, and a boosting component is provided on the pipeline. The pressure chamber 51 is pressurized by the boosting component, so that the air pressure in the pressure chamber 51 is always maintained within a set pressure range, so that the air pressure in the pressure chamber 51 can push the catheter 11 to move without squeezing and deforming the catheter, thereby pushing the slide plate 12 so that the catheter 11 can always be tightly pressed against the outer wall of the pipe segment 7, so that under the supporting action of the catheter 11, a certain distance of gap can always be maintained between the inner wall of the shield tail 6 and the outer wall of the pipe segment 7.

[0044] Preferably, a sealing ring is provided on the peripheral wall of the slide plate 12 to seal the gap between the slide plate 12 and the inner wall of the cavity 5 , thereby ensuring the sealing of the pressure chamber 51 .

[0045] Preferably, the setting direction of the cavity 5 is parallel to the inner wall of the shield tail 6, and the cavity 5 is provided with a through hole connected to the gap of the shield tail 6 and perpendicular to the inner wall of the shield tail 6. The end of the conduit 11 away from the slide plate 12 extends out of the through hole and is tightly against the outer wall of the pipe segment 7. An L-shaped guide tube made of hard material is provided in the cavity 5, and the conduit 11 is inserted in the guide tube. The guide tube includes a first guide portion whose setting direction is perpendicular to the inner wall of the shield tail 6 and a second guide portion whose setting direction is consistent with the length direction of the shield tail 6. The first guide portion and the second guide portion allow the conduit 11 to remain straight when it moves, and a part of the conduit 11 is guided to be perpendicular to the inner wall of the shield tail 6 by the first guide portion, and the other part of the conduit 11 is guided to be two parts consistent with the length direction of the shield tail by the second guide portion.

[0046] See also Figure 2 A mounting hole is provided on the inner wall of the shield tail 6 at the pressure chamber 51, a mounting seat 4 is fixedly installed at the mounting hole, and the tension sensor 3 is fixedly arranged on the mounting seat 4 and located in the pressure chamber 51. Through the mounting hole, the system for measuring the shield tail gap can be installed on the cavity 5 in the shield tail 6. Specifically, the mounting seat 4 is fixedly installed on the inner wall of the shield tail 6 by bolts.

[0047] The system for measuring the shield tail gap in this embodiment also includes a PLC that is in communication with the tension sensor 3 . The PLC receives the elastic force value sent by the tension sensor 3 , and then obtains the corresponding shield tail 6 gap through calculation.

[0048] Specifically, several pairs of systems for measuring the shield tail gap are evenly distributed on the inner wall of the shield tail 6 corresponding to the outer walls of the segments 7. Multiple groups of shield tail gap data at multiple different positions of the shield tail 6 are measured by the several pairs of systems for measuring the shield tail gap. By comparing and analyzing each group of shield tail gap data, it can be concluded whether the segments 7 are accurately assembled, thereby controlling and correcting the excavation posture of the shield machine.

[0049] The following is a description of the working process of the system for measuring the shield tail gap of the present invention.

[0050] When the gap of the shield tail 6 becomes larger, the driving mechanism drives the first end to move toward the second end, thereby pushing the catheter assembly to move out of the cavity 5, so that the elastic member 2 is stretched and the elastic force of the elastic member 2 changes; when the gap of the shield tail becomes smaller, the pipe segment 7 pushes the second end to move toward the first end, thereby pushing the catheter assembly to move into the cavity 5, so that the elastic member 2 is shortened and the elastic force of the elastic member 2 changes. The tension sensor 3 measures the elastic force value of the elastic member 2 and sends it to the PLC. The PLC receives the elastic force value sent by the tension sensor 3, and then calculates the corresponding distance between the inner wall of the shield tail 6 and the outer wall of the pipe segment 7.

[0051] The present invention also provides a method for measuring the shield tail clearance system as described above, comprising the following steps:

[0052] A cavity 5 is opened on the inner wall of the shield tail 6, the catheter assembly is installed in the cavity 5, the elastic member 2 is fixedly installed on the catheter assembly, the tension sensor 3 is fixedly connected to the elastic member 2, and the driving mechanism is installed in the cavity 5. The elastic force value of the elastic member 2 is measured by the tension sensor 3, and the deformation amount of the elastic member 2 can be calculated according to the elastic force value, thereby calculating the gap of the shield tail 6.

[0053] A PLC is provided which is in communication with the tension sensor 3 , and the PLC receives the elastic force value sent by the tension sensor 3 , and then obtains the corresponding shield tail 6 gap through calculation.

[0054] Several pairs of systems for measuring the shield tail gap are evenly distributed on the inner wall of the shield tail 6 corresponding to the outer wall of the segment 7. Multiple groups of shield tail gap data at multiple different positions of the shield tail 6 are measured by the several pairs of systems for measuring the shield tail gap. By comparing and analyzing each group of shield tail gap data, it can be determined whether the segment 7 is accurately assembled, thereby controlling and correcting the excavation posture of the shield machine.

[0055] By adopting the above technical solution, the present invention has the following beneficial effects:

[0056] The present invention drives the catheter assembly to move through a driving mechanism so that the catheter assembly partially extends out of the cavity and is tightly against the outer wall of the tube segment. When the shield tail gap becomes larger, the driving mechanism drives the catheter assembly to move out of the cavity so that the elastic member is stretched; when the shield tail gap becomes smaller, the tube segment catheter assembly moves into the cavity so that the elastic member is shortened; the elastic force value of the elastic member is measured by a tension sensor, and the deformation of the elastic member can be calculated according to the elastic force value, thereby calculating the shield tail gap, thereby avoiding the problem that the non-contact measurement method used in the prior art is easily affected by the external environment, making the measurement data more accurate. The driving mechanism applies a driving force to push the catheter assembly out of the cavity and tightly against the outer wall of the tube segment, so that under the supporting action of the catheter assembly, a certain distance of gap can always be maintained between the inner wall of the shield tail and the outer wall of the tube segment, thereby avoiding the burrs on the outer wall of the tube segment from wearing the inner wall of the shield tail.

[0057] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of the present invention, so they have no substantial technical significance. Any modification of the structure, change of the proportion relationship or adjustment of the size should still fall within the scope of the technical content disclosed by the present invention without affecting the effects and purposes that can be achieved by the present invention. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description, and are not used to limit the scope of the implementation of the present invention. The change or adjustment of their relative relationship should also be regarded as the scope of the implementation of the present invention without substantially changing the technical content.

[0058] The present invention is described in detail above in conjunction with the embodiments of the accompanying drawings. A person skilled in the art can make various variations of the present invention according to the above description. Therefore, certain details in the embodiments should not constitute a limitation of the present invention, and the scope of protection of the present invention shall be defined by the scope of the attached claims.

Claims

1. A system for measuring a shield tail gap, wherein the shield tail gap is formed between the inner wall of the shield tail and the outer wall of the corresponding segment, characterized in that: The system comprises: A cavity is provided in the shield tail, the arrangement direction of the cavity is consistent with the length direction of the shield tail, and the cavity is connected with the gap of the shield tail; A catheter assembly slidably disposed in the cavity, comprising a first end and a second end, wherein the first end is disposed in the cavity and the second end is disposed in the shield tail gap; A driving mechanism disposed in the cavity, the driving mechanism applying a driving force to the first end to push the catheter assembly out of the cavity so that the second end is tightly against the outer wall of the tube segment; an elastic member disposed on the first end; and A tension sensor fixedly connected to a side of the elastic member away from the first end; When the shield tail gap changes, the catheter assembly moves correspondingly in the cavity to deform the elastic member, the elastic force value of the elastic member is measured by the tension sensor, and the shield tail gap is calculated according to the elastic force value; The catheter assembly comprises an elastic catheter and a slide plate fixed to one end of the catheter, wherein the slide plate is placed in the cavity and can slide along the inner wall of the cavity; The conduit is partially placed in the cavity and partially located in the shield tail gap; It also includes a PLC that is in communication with the tension sensor, the PLC receives the elastic force value sent by the tension sensor, and then obtains the corresponding shield tail gap through calculation; An L-shaped guide tube is provided in the cavity, and the catheter is inserted in the guide tube. The guide tube includes a first guide portion whose setting direction is perpendicular to the inner wall of the shield tail and a second guide portion whose setting direction is consistent with the length direction of the shield tail. The first guide portion and the second guide portion enable the catheter to remain straight when moving.

2. The system for measuring the shield tail gap according to claim 1, characterized in that: The driving mechanism includes a closed pressure chamber formed in the cavity and a medium filled in the pressure chamber; The slide plate is communicated with the pressure chamber, and a driving force for pushing the slide plate is formed by filling a medium into the pressure chamber.

3. The system for measuring the shield tail gap according to claim 2, characterized in that: The pressure chamber is connected to a pipeline, and a pressurizing component is provided on the pipeline, and the pressure chamber is pressurized by the pressurizing component.

4. The system for measuring the shield tail gap according to claim 2, characterized in that: A mounting hole is provided on the inner wall of the shield tail corresponding to the pressure chamber; A mounting seat is fixedly mounted at the mounting hole; The tension sensor is fixed on the mounting seat and is located in the pressure chamber.

5. A measurement method using the system for measuring the shield tail gap according to claim 1, characterized in that: The steps include: The cavity is provided on the inner wall of the shield tail; installing the catheter assembly in the cavity; Installing and fixing the elastic member on the catheter assembly; The tension sensor is fixedly connected to the elastic member; The driving mechanism is installed in the cavity, and the elastic force value of the elastic member is measured by the tension sensor. The deformation amount of the elastic member can be calculated according to the elastic force value, thereby calculating the shield tail gap.

6. The measuring method according to claim 5, characterized in that: The following steps are also included: A PLC is provided which is in communication with the tension sensor. The PLC receives the elastic force value sent by the tension sensor and then obtains the corresponding shield tail gap through calculation.

7. The measuring method according to claim 5, characterized in that: The following steps are also included: A plurality of pairs of systems for measuring the shield tail gap are evenly distributed on the inner wall of the shield tail corresponding to the outer wall of the segment, and a plurality of groups of shield tail gap data at a plurality of different positions of the shield tail gap are measured by the plurality of pairs of systems for measuring the shield tail gap. By comparing and analyzing each group of shield tail gap data, it is concluded whether the segment is accurately assembled.

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