A shield machine grouting system and a shield machine grouting control method

Abstract

A shield machine grouting system and a shield machine grouting control method, comprising a shield tail, a grease injection unit, a grouting unit and a controller, wherein the shield tail has a front cavity and a rear cavity; the front cavity and the rear cavity are both provided with a plurality of first grease pressure sensors; the grease injection unit comprises a grease pump assembly and at least one grease pipeline; the grease pump assembly comprises an electromagnetic flow valve and a grease pump, and the grease pipeline comprises a pneumatic ball valve and a grease injection point; the grease injection point, the pneumatic ball valve, the grease pump and the electromagnetic flow valve are connected in sequence, and the grease injection point is connected with the front cavity and the rear cavity respectively; the grouting unit comprises at least one grouting pipeline, and the grouting pipeline comprises a grouting pump, a grouting pressure sensor and a grouting point connected in sequence; the controller is connected with the first grease pressure sensor, the electromagnetic flow valve, the pneumatic ball valve, the grouting pressure sensor, the grouting pump and the grease pump respectively. The present invention can monitor the conditions of grease pressure and grouting pressure in real time, so as to automatically adjust the injection amount of grease and slurry at the shield tail.

Description

Technical Field

[0001] The invention relates to the technical field of shield machines, and in particular to a shield machine grouting system and a shield machine grouting control method. Background Art

[0002] Shield machines are used in urban subway construction. They not only need to pass under rivers but also through densely packed buildings. The reliability of shield machines is related to the construction safety of subways and the safety of ground buildings. In the past, there have been incidents of road collapse, house cracking and even collapse caused by improper shield machine design or operation. Such accidents are often caused by failure of the shield tail brush seal or insufficient grouting. Therefore, the grouting volume and grouting pressure of the shield machine during excavation play a vital role in preventing ground subsidence. At present, the control mode of the shield machine grouting system is pressure control, and the grease consumption of the shield tail is large, that is, the grouting stops when the grouting pressure reaches the maximum set value. Due to the large fluctuation of the grouting pressure, there is an instantaneous pressure reaching the set value, causing the grouting pump to frequently trip and stop, and the grouting stops. The grouting pump needs to be started frequently, which brings great inconvenience to the construction. Summary of the invention

[0003] The present invention aims to solve one of the technical problems in the above technology at least to a certain extent. To this end, one object of the present invention is to provide a shield machine grouting system.

[0004] The second object of the present invention is to provide a shield machine grouting control method.

[0005] To achieve the above-mentioned purpose, the first embodiment of the present invention proposes a shield machine grouting system, including a shield tail and a pipe segment, wherein the shield tail is located in the soil body, and the pipe segment is located in the shield tail, and the shield tail has a front cavity and a rear cavity, and there is an area A between the soil body and the pipe segment; the interiors of the front cavity and the rear cavity are each provided with a plurality of first grease pressure sensors; further comprising a grease injection unit, a grouting unit and a controller, the grease injection unit comprising a grease pump assembly and at least one grease pipeline; the grease pump assembly comprises an electromagnetic flow valve and a grease pump, and the grease pipeline comprises a pneumatic ball valve and a grease injection point; the grease injection point, the pneumatic ball valve, the grease pump and the electromagnetic flow valve are connected in sequence, and the grease injection point is communicated with the front cavity and the rear cavity respectively;

[0006] The grouting unit comprises at least one grouting pipeline, wherein the grouting pipeline comprises a grouting pump, a grouting pressure sensor and a grouting point connected in sequence, and the grouting point is connected to the area A;

[0007] The controller includes a lower computer and an upper computer. The lower computer is connected to the first grease pressure sensor, the electromagnetic flow valve, the pneumatic ball valve, the grouting pressure sensor, the grouting pump and the grease pump respectively, and is used to receive the pressure signals of the first grease pressure sensor and the grouting pressure sensor and control the opening / closing of the electromagnetic flow valve, the pneumatic ball valve, the grouting pump and the grease pump; the upper computer is connected to the lower computer, and the upper computer receives the signal fed back by the lower computer, issues an alarm and / or issues a control instruction to the lower computer.

[0008] Based on the above design, the four detection points in the front cavity and the rear cavity can monitor the grease pressure and grouting pressure in real time, so as to automatically adjust the injection amount of grease and slurry at the shield tail.

[0009] In addition, a shield machine grouting system according to the above embodiment of the present invention may also have the following additional technical features:

[0010] The grease pipeline also includes a second grease pressure sensor, which is arranged between the grease injection point and the pneumatic ball valve, and is used to detect the grease pressure in the grease pipeline.

[0011] The number of the first grease pressure sensors inside the front cavity and the rear cavity are both 4, which are evenly distributed at the four corners inside the front cavity and the rear cavity, respectively, and can monitor the grease pressure at various locations inside the front cavity and the rear cavity in real time.

[0012] The grease pipeline also includes a first manual ball valve for manually controlling the on and off of the grease pipeline.

[0013] The number of the grease pipelines is 4, so that the grease injection is more uniform.

[0014] The grouting pipeline also includes a second manual ball valve for manually controlling the on and off of the grouting pipeline.

[0015] The number of the grouting pipelines is 4, which makes the grouting more uniform.

[0016] To achieve the above-mentioned purpose, the second embodiment of the present invention proposes a shield machine grouting control method, which uses the shield machine grouting system to perform operations. During the tunneling process of the shield machine, the lower computer receives the pressure signals fed back by the first grease pressure sensor, the second grease pressure sensor, and the grouting pressure sensor in real time, and reports them to the upper computer. The specific steps are as follows:

[0017] (1) The grease pump is started to build up pressure in the front and rear chambers of the shield tail, and then the grouting pump is started. The first grease pressure sensors in the front and rear chambers detect the grease pressure in the front and rear chambers in real time, and the grouting pressure sensor detects the grouting pressure in real time. At the same time, the host computer compares the grease pressure and the grouting pressure.

[0018] (2) When the grease pressure is higher than the grouting pressure, the lower computer controls the electromagnetic flow valve to open at the minimum, the air supply pressure is the preset minimum value, and the grease injection amount is injected at the minimum value;

[0019] (3) When the grease pressure is lower than the grouting pressure, the lower computer controls the electromagnetic flow valve to open to the maximum, the air supply pressure is the preset maximum value, and the grease injection amount is injected at the maximum value;

[0020] By dynamically adjusting the injection amount of shield tail grease, the shield tail grease consumption can be minimized while ensuring that the grease pressure at the four detection points of the front cavity and the rear cavity is always higher than the grouting pressure;

[0021] (4) When the grease pressure detected by any grease pressure sensor suddenly drops to 0, it is possible that the grease seals in the front and rear cavities of the shield tail have failed, resulting in grouting leakage. The upper computer alarms, the lower computer controls the grouting pump to shut down, the shield machine stops advancing, and the electromagnetic flow valve is controlled to open to the maximum. The grease injection amount is injected into the front and rear cavities at the maximum value until the grouting leakage stops.

[0022] Based on the above design, by real-time monitoring of the grease pressure at the four detection points in the front cavity and the rear cavity, which is always higher than the grouting pressure, the injection amount of shield tail grease and slurry can be automatically and dynamically adjusted to minimize the shield tail grease consumption.

[0023] In addition, the shield machine grouting control method proposed in the above embodiment of the present invention may also have the following additional technical features:

[0024] It also includes step (5):

[0025] The host computer is preset with a trip time delay. When the grouting pressure detected by the grouting pressure sensor exceeds the preset maximum grouting pressure and lasts for more than two seconds, the host computer alarms and the lower computer controls the grouting pump to shut down. This setting can prevent the grouting pressure from exceeding the maximum setting value for a long time, affecting the shield tail sealing effect and causing leakage, and can also prevent the grouting pump from frequent tripping. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a cross-sectional view of the shield tail in the present invention.

[0027] Figure 2 This is a distribution diagram of the first grease pressure sensor in the front cavity or the rear cavity in the present invention.

[0028] Figure 3 It is a structural schematic diagram of the grouting unit in the present invention.

[0029] Figure 4 It is a structural schematic diagram of the grease injection unit in the present invention.

[0030] Figure 5It is a principle block diagram of grouting and grease injection in the present invention. DETAILED DESCRIPTION

[0031] Embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended to be used to explain the present invention, and should not be construed as limiting the present invention.

[0032] When the shield machine excavates in the soil 3, a cavity is formed between the soil 3 and the pipe segment 2. In order to prevent the soil 3 from collapsing and causing ground settlement, continuous grouting must be performed in this cavity to fill it.

[0033] See also Figure 1-2 A shield machine grouting system comprises a shield tail 1, a pipe segment 2, a grease injection unit 5, a grouting unit 6 and a controller 7, wherein the shield tail 1 is located in a soil body 3, the pipe segment 2 is located in the shield tail 1, a grouting channel 8 and a grouting plate 9 are arranged between the shield tail 1 and the soil body 3, a front cavity 11 and a rear cavity 12 are arranged in the shield tail 1, a shield tail brush 10 is arranged between the front cavity 11 and the rear cavity 12, an area A is arranged between the soil body 3 and the pipe segment 2, and slurry flows into the area A from the grouting channel 8; a plurality of first grease pressure sensors 4 are arranged inside the front cavity 11 and the rear cavity 12, and the number of the first grease pressure sensors 4 inside the front cavity 11 and the rear cavity 12 is preferably 4, which are evenly arranged at the four corners inside the front cavity 11 and the rear cavity 12, that is, 4 first grease pressure sensors 4 are arranged at the upper left, upper right, lower left and lower right of the front cavity 11 and the rear cavity 12 respectively; when working, grease is injected into the front cavity 11 and the rear cavity 12.

[0034] Please refer to Figure 3-5The grease injection unit 5 includes a grease pump assembly 51 and at least one grease pipeline 52, and the number of the grease pipelines 52 is preferably 4; the grease pump assembly 51 has an electromagnetic flow valve 511 and a grease pump 512, and the grease pipeline 52 includes a pneumatic ball valve 521, a grease injection point 522, a second grease pressure sensor 523 and a first manual ball valve 524 for manually controlling the on-off of the grease pipeline 52; the grease injection point 522 is connected to the front cavity 11 and the rear cavity 12 respectively, and the second grease pressure sensor 523 is arranged between the grease injection point 522 and the pneumatic ball valve 521. The grease injection point 522, the pneumatic ball valve 521, the grease pump 512 and the electromagnetic flow valve 511 are connected in sequence; the grouting unit 6 includes at least one grouting pipeline 61, and the number of the grouting pipelines 61 is preferably 4; the grouting pipeline 61 includes a grouting pump 611, a grouting pressure sensor 612, a grouting point 613, and a second manual ball valve 614 for manually controlling the on-off of the grouting pipeline 61, which are connected in sequence, and the grouting point 613 is connected to the area A; the controller 7 includes a lower computer 71 and an upper computer 72, and the lower computer 71 is connected to the upper computer 72. The first grease pressure sensor 4, the electromagnetic flow valve 511, the pneumatic ball valve 521, the grouting pressure sensor 612, the grouting pump 611 and the grease pump 512 are respectively connected to receive the pressure signals of the first grease pressure sensor 4 and the grouting pressure sensor 612 and control the opening / closing of the electromagnetic flow valve 511, the pneumatic ball valve 521, the grouting pump 611 and the grease pump 512; the upper computer 72 is connected to the lower computer 71, and the upper computer 72 receives the signal fed back by the lower computer 71, and issues an alarm and / or a control instruction to the lower computer 71.

[0035] Please refer to Figure 1 and Figure 3-5 A shield machine grouting control method utilizes the shield machine grouting system to operate. Three grouting modes are set for soft soil, hard rock and composite strata respectively. The three modes have different grouting parameters, namely, different maximum and minimum setting values ​​of grouting pressure and different injection speeds, to solve the problems of grouting difficulties and insufficient grouting.

[0036] During the tunneling process of the shield machine, the lower computer 71 receives the pressure signals fed back by the first grease pressure sensor 4, the second grease pressure sensor 523, and the grouting pressure sensor 612 in real time, and reports them to the upper computer 72. The specific steps are as follows:

[0037] (1) The grease pump 512 is started, and pressure is first established in the front cavity 11 and the rear cavity 12 of the shield tail 1. Then the grouting pump 611 is started, and the first grease pressure sensor 4 of the front cavity 11 and the rear cavity 12 begins to detect the grease pressure of the front cavity 11 and the rear cavity 12 in real time. The grouting pressure sensor 612 detects the grouting pressure in real time. At the same time, the upper computer 72 compares the grease pressure and the grouting pressure.

[0038] (2) When the grease pressure is higher than the grouting pressure, the lower computer 71 controls the valve opening of the electromagnetic flow valve 511 to be minimum, the air supply pressure is the preset minimum value, and the grease injection amount is injected at the minimum value;

[0039] (3) When the grease pressure is lower than the grouting pressure, the lower computer 71 controls the electromagnetic flow valve 511 to open to the maximum, the air supply pressure is the preset maximum value, and the grease injection amount is the maximum value; by dynamically adjusting the injection amount of the shield tail 1 grease, the grease consumption of the shield tail 1 is minimized while ensuring that the grease pressures at the four detection points of the front cavity 11 and the rear cavity 12 are always higher than the grouting pressure.

[0040] (4) When the grease pressure detected by any grease pressure sensor suddenly drops to 0, it is possible that the grease seals of the front cavity 11 and the rear cavity 12 of the shield tail 1 fail, resulting in grouting leakage. The upper computer 72 alarms, the lower computer 71 controls the grouting pump 611 to be turned off, the shield machine stops advancing, and the electromagnetic flow valve 511 is controlled to open to the maximum. The grease injection amount is injected into the front cavity 11 and the rear cavity 12 at the maximum value until the grouting leakage stops.

[0041] (5) The upper computer 72 is preset with a trip time delay. When the grouting pressure detected by the grouting pressure sensor 612 exceeds the preset maximum grouting pressure and lasts for more than two seconds, the upper computer 72 alarms and the lower computer 71 controls the grouting pump 611 to shut down. This can prevent the grouting pressure from exceeding the maximum set value for a long time, affecting the sealing effect of the shield tail 1 and causing leakage, and can also prevent the grouting pump 611 from frequently tripping.

[0042] The present invention arranges a first grease pressure sensor 4 in the front cavity 11 and the rear cavity 12, i.e., the sealed cavity of the shield tail 1, which can truly reflect the grease pressure value of the sealed cavity, and control it in real time to match the grouting pressure, thereby preventing the slurry from penetrating the sealed cavity and leaking, causing construction risks; the shield machine grouting system of the present invention can automatically control the amount of grease injection, reduce grease consumption, and control the grouting pressure to be stable, thereby preventing the grouting pump 611 from frequent tripping and stopping due to the high instantaneous grouting pressure.

[0043] In the description of the present invention, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of the present invention, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0044] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A shield machine grouting control method, which uses a shield machine grouting system to perform operations, characterized in that: The shield machine grouting system comprises a shield tail (1), a pipe segment (2), a grease injection unit (5), a grouting unit (6) and a controller (7); the shield tail (1) is located in a soil body (3); the pipe segment (2) is located in the shield tail (1); a front cavity (11) and a rear cavity (12) are provided in the shield tail (1); an area A is provided between the soil body (3) and the pipe segment (2); a plurality of first grease pressure sensors (4) are provided inside the front cavity (11) and the rear cavity (12); The grease injection unit (5) comprises a grease pump assembly (51) and at least one grease pipeline (52); the grease pump assembly (51) comprises an electromagnetic flow valve (511) and a grease pump (512); the grease pipeline (52) comprises a pneumatic ball valve (521) and a grease injection point (522); the grease injection point (522), the pneumatic ball valve (521), the grease pump (512) and the electromagnetic flow valve (511) are connected in sequence, and the grease injection point (522) is connected to the front cavity (11) and the rear cavity (12) respectively; The grouting unit (6) comprises at least one grouting pipeline (61), wherein the grouting pipeline (61) comprises a grouting pump (611), a grouting pressure sensor (612) and a grouting point (613) which are connected in sequence, and the grouting point (613) is connected to area A; The controller (7) comprises a lower computer (71) and an upper computer (72); the lower computer (71) is connected to the first grease pressure sensor (4), the electromagnetic flow valve (511), the pneumatic ball valve (521), the grouting pressure sensor (612), the grouting pump (611) and the grease pump (512) respectively, and is used to receive pressure signals from the first grease pressure sensor (4) and the grouting pressure sensor (612) and control the opening / closing of the electromagnetic flow valve (511), the pneumatic ball valve (521), the grouting pump (611) and the grease pump (512); the upper computer (72) is connected to the lower computer (71), and receives the signal fed back by the lower computer (71), and issues an alarm or / and a control instruction to the lower computer (71); During the tunneling process of the shield machine, the lower computer (71) receives the pressure signals fed back by the first grease pressure sensor (4), the second grease pressure sensor (523), and the grouting pressure sensor (612) in real time, and reports them to the upper computer (72). The specific steps are as follows: (1) The grease pump (512) is started to build up pressure in the front chamber (11) and the rear chamber (12) of the shield tail (1), and then the grouting pump (611) is started. The first grease pressure sensors (4) of the front chamber (11) and the rear chamber (12) detect the grease pressure of the front chamber (11) and the rear chamber (12) in real time, and the grouting pressure sensor (612) detects the grouting pressure in real time. At the same time, the upper computer (72) compares the grease pressure and the grouting pressure; (2) When the grease pressure is higher than the grouting pressure, the lower computer (71) controls the electromagnetic flow valve (511) to have a minimum valve opening, the air supply pressure is a preset minimum value, and the grease injection amount is injected at the minimum value; (3) When the grease pressure is lower than the grouting pressure, the lower computer (71) controls the electromagnetic flow valve (511) to have a maximum valve opening, the air supply pressure is a preset maximum value, and the grease injection amount is injected at the maximum value; (4) When the grease pressure detected by any grease pressure sensor suddenly drops to 0, the upper computer (72) sounds an alarm, the lower computer (71) controls the grouting pump (611) to be turned off, and controls the valve opening of the electromagnetic flow valve (511) to be maximum, and the grease injection amount is injected into the front cavity (11) and the rear cavity (12) at the maximum value until the grouting leakage stops.

2. A shield machine grouting control method as claimed in claim 1, characterized in that: The grease pipeline (52) further comprises a second grease pressure sensor (523), wherein the second grease pressure sensor (523) is arranged between the grease injection point (522) and the pneumatic ball valve (521).

3. A shield machine grouting control method as claimed in claim 1, characterized in that: The number of the first grease pressure sensors (4) inside the front cavity (11) and the rear cavity (12) is four, and they are evenly arranged at the four corners inside the front cavity (11) and the rear cavity (12).

4. A shield machine grouting control method as claimed in claim 1, characterized in that: The grease pipeline (52) further comprises a first manual ball valve (524) for manually controlling the on and off of the grease pipeline (52).

5. A shield machine grouting control method as claimed in claim 4, characterized in that: The number of the grease pipelines (52) is 4.

6. A shield machine grouting control method as claimed in claim 1, characterized in that: The grouting pipeline (61) further comprises a second manual ball valve (614) for manually controlling the on and off of the grouting pipeline (61).

7. A shield machine grouting control method as claimed in claim 6, characterized in that: The number of the grouting pipelines (61) is 4.

8. A shield machine grouting control method as claimed in claim 1, characterized in that: It also includes step (5): The host computer (72) is preset with a trip time delay. When the grouting pressure detected by the grouting pressure sensor (612) exceeds the preset maximum grouting pressure and exceeds the preset time T, the host computer (72) alarms and the lower computer (71) controls the grouting pump (611) to shut down.

9. A shield machine grouting control method as claimed in claim 8, characterized in that: The T is 2-3 seconds.

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