A method for installing a relay pump and discharging mud during shield tunneling

Abstract

The present invention discloses a method for installing a relay pump and discharging mud during shield tunneling, and relates to the field of shield tunnel engineering. The method comprises: when building a mud pipeline system, using a branch mud pipe at the installation position of a relay pump; after the shield pipe replacement area reaches the installation position of the relay pump, connecting the first branch pipe with the slurry inlet of the relay pump to be installed through a first connecting pipe, connecting the second branch pipe with the slurry outlet of the relay pump through a second connecting pipe, and determining whether the relay pump fails according to the monitored slurry pressure, impeller rotation torque and vibration intensity; after determining that the relay pump fails, turning on the main control switch, turning off the first switch and / or the second switch, and switching the mud main pipe to discharge slurry. The present invention can incorporate the installed relay pump into the mud pipeline system while the shield machine is excavating, and use the relay pump to discharge slurry without stopping the shield, thereby improving the construction efficiency of the shield machine.

Description

Technical Field

[0001] The invention relates to the field of shield tunnel engineering, and in particular to a method for installing a relay pump and discharging mud during a shield tunneling process. Background Art

[0002] During the construction of the slurry shield, a slurry tank is formed between the cutterhead and the shield body partition of the shield machine. High-quality slurry is sent into the slurry tank through the ground slurry pump, and the slurry is pressurized to form an impermeable or slightly permeable mud film on the excavation surface. The slurry pressure in the slurry tank passes through the mud film to balance the soil pressure and water pressure on the excavation surface. The slag cut off by the cutterhead during the excavation of the shield machine is mixed with the slurry in the slurry tank by the cutterhead, and then the mixed slurry is transported and pumped to the ground backstage slurry treatment station by the slurry discharge pump, and then screened and treated by the ground slurry treatment station, and finally adjusted in the adjustment tank for recycling, so as to achieve the transportation of the slurry from the shield excavation.

[0003] The slurry shield system needs to rely on slurry pumps and slurry discharge pumps for continuous circulation. However, due to the limitations of the slurry pump's own head, slurry density, transportation distance, height difference and other factors on the pump performance, for long-distance tunnels, a single slurry pump and a slurry discharge pump are far from meeting the construction requirements of the entire tunnel. Therefore, it is necessary to install a relay pump after the shield machine has excavated a certain distance to ensure the normal operation of the entire slurry circulation system.

[0004] In the existing slurry shield construction, the conventional method of installing the relay pump is: after the slurry circulation load reaches the limit, the shield machine is stopped, the original slurry pipe is removed, and then the relay pump is installed. However, the existing construction method requires stopping the shield excavation construction, disconnecting the slurry pipeline, and then connecting the relay pump. This construction method requires stopping the shield construction for a long time, which seriously affects and restricts the excavation work of the shield machine. Summary of the invention

[0005] The invention provides a method for installing a relay pump and discharging mud during shield tunneling, which solves the problem of low shield machine construction efficiency in the prior art.

[0006] In order to achieve the above object, the present invention adopts the following technical scheme:

[0007] The present invention provides a method for installing a relay pump and discharging mud during shield tunneling, the method comprising:

[0008] In combination with the predetermined relay pump installation position, when constructing the mud pipeline system, a branch mud pipe is used at the relay pump installation position; the branch mud pipe includes a mud main pipe, a main control switch is provided in the middle of the mud main pipe, and a first branch pipe and a second branch pipe connected to the mud main pipe, the first branch pipe and the second branch pipe are relatively arranged on both sides of the main control switch, and the openings of the first branch pipe and the second branch pipe are both blocked by blind plates;

[0009] After the shield pipe replacement area reaches the relay pump installation position, the blind plates at the openings of the first branch pipe and the second branch pipe are replaced by the first switch and the second switch respectively, and the first branch pipe is connected to the slurry inlet of the relay pump to be installed through the first connecting pipe, and the second branch pipe is connected to the slurry outlet of the relay pump through the second connecting pipe; the first switch is used to control the connection between the first branch pipe and the first connecting pipe, and the second switch is used to control the connection between the second branch pipe and the second connecting pipe;

[0010] A pressure gauge for monitoring the slurry pressure is provided at the inlet of the relay pump, a torque meter for monitoring the rotation torque of the impeller in the relay pump is provided at the motor shaft of the relay pump, and an accelerometer for monitoring the vibration intensity of the relay pump during operation is provided on the pump body of the relay pump;

[0011] Determining whether the relay pump fails according to the monitored slurry pressure, the impeller rotation torque, and the vibration intensity;

[0012] After determining that the relay pump fails, the main control switch is turned on, the first switch and / or the second switch are turned off, and the mud main pipe is switched to perform mud discharge.

[0013] In a possible implementation, when the first connecting pipe includes a first bent section and a first straight section; connecting the first branch pipe to the slurry inlet of the relay pump to be installed through the first connecting pipe specifically includes:

[0014] The relay pump is arranged below the branch mud pipe, the mud outlet is arranged on the top of the relay pump, and the mud inlet is arranged on the side wall of the relay pump;

[0015] One end of the first bent section is connected to the first branch pipe, the other end of the first bent section is connected to one end of the first straight section, the other end of the first straight section is connected to the slurry inlet, and the angle between the first straight section and the horizontal plane is -15°~-20°.

[0016] In a possible implementation, when the second connecting pipe includes a second bent section and a second straight section, connecting the second branch pipe to the slurry outlet of the relay pump through the second connecting pipe specifically includes:

[0017] One end of the second bent section is connected to the slurry outlet, the other end of the second bent section is connected to one end of the second straight section, one end of the second straight section is connected to the second branch pipe, and the angle between the second straight section and the horizontal plane is 30°~40°.

[0018] In a possible implementation manner, the first bent section and the first straight section, as well as the second bent section and the second straight section are connected via a flexible pipe.

[0019] In a possible implementation, determining whether the relay pump fails according to the monitored slurry pressure, the impeller rotation torque, and the vibration intensity specifically includes:

[0020] According to the magnitude of the monitored slurry pressure and the preset pressure value, and the magnitude of the monitored impeller rotation torque and the preset torque value, determining whether the relay pump has a blockage fault;

[0021] According to the monitored vibration intensity and the magnitude of the preset vibration value, it is determined whether the relay pump has a fault of stones mixed into the pump body or stones stuck on the impeller.

[0022] In a possible implementation, while determining whether the relay pump fails according to the monitored slurry pressure, the impeller rotation torque, and the vibration intensity, the method further includes:

[0023] The preset pressure value, the preset torque value and the first preset percentage of the preset vibration value are respectively used as the warning values ​​of the slurry pressure, the impeller rotation torque and the vibration intensity;

[0024] After the monitored slurry pressure, the impeller rotation torque and the vibration intensity reach the warning values ​​of the slurry pressure, the impeller rotation torque and the vibration intensity respectively, the corresponding warning function is triggered.

[0025] In a possible implementation, while determining whether the relay pump fails according to the monitored slurry pressure, the impeller rotation torque, and the vibration intensity, the method further includes:

[0026] The second preset percentages of the preset pressure value, the preset torque value and the preset vibration value are respectively used as the alarm values ​​of the slurry pressure, the impeller rotation torque and the vibration intensity; the second preset percentage is greater than the first preset percentage;

[0027] After the monitored slurry pressure, the impeller rotation torque and the vibration intensity reach the alarm values ​​of the slurry pressure, the impeller rotation torque and the vibration intensity respectively, the corresponding emergency alarm function is triggered.

[0028] In a possible implementation, after determining that the relay pump fails, the method further includes:

[0029] Start the high-pressure flushing device to spray high-pressure water to the first connecting pipe, the second connecting pipe, and the pump body inlet and pump body bottom of the relay pump to flush the mud inside the first connecting pipe and the second connecting pipe, as well as the relay pump impeller, inlet channel and pump body bottom.

[0030] In a possible implementation, before the shield pipe replacement area reaches the relay pump installation position, the method further includes:

[0031] The tunnel internal structure lining is cast in advance, the box culvert is filled densely, and a mounting base is applied at the installation position of the relay pump; the mounting base is used to fix the relay pump.

[0032] In a possible implementation, before the relay pump is incorporated into the mud pipeline system, the method further includes:

[0033] The relay pump is debugged to ensure that the relay pump operates normally.

[0034] In actual application, the method for installing a relay pump and discharging mud during shield tunneling provided by an embodiment of the present invention does not need to stop shield tunneling construction. It is only necessary to replace the cover plate at the opening of the first branch pipe through the first switch and replace the cover plate at the opening of the second branch pipe through the second switch after the shield pipe replacement area reaches the relay pump installation position; then, the first branch pipe is connected to the slurry inlet of the relay pump through the first connecting pipe, and the second branch pipe is connected to the slurry outlet of the relay pump through the second connecting pipe; controlling the first switch to be turned on can realize the connection between the first branch pipe and the slurry inlet, and controlling the second switch to be turned on can realize the connection between the second branch pipe and the slurry outlet, and at the same time, closing the main control switch can integrate the installed relay pump into the mud pipeline system, thereby realizing the installation of the relay pump while the shield machine is tunneling, saving construction time and improving construction efficiency.

[0035] After the relay pump is incorporated into the mud pipeline system, a pressure gauge is installed at the inlet of the relay pump to monitor the incoming slurry pressure in real time; a torque meter is installed at the motor shaft of the relay pump to monitor the impeller rotation torque in the relay pump; an accelerometer is installed on the pump body of the relay pump to monitor the vibration intensity during the operation of the relay pump; whether the relay pump is faulty is determined based on the real-time monitored slurry pressure, impeller rotation torque and vibration intensity and the preset threshold of the corresponding items; if the relay pump is detected to have a fault, the main control switch is turned on, and the first switch and / or the second switch are turned off at the same time, and the switch is switched to the mud main pipe for slurry discharge. After the relay pump is overhauled, it is switched back to the relay pump branch for slurry discharge. The shield machine does not stop during the whole process to ensure the construction efficiency of the shield machine. BRIEF DESCRIPTION OF THE DRAWINGS

[0036] Figure 1 A flowchart of the steps of a method for installing a relay pump and discharging mud during shield tunneling provided by an embodiment of the present invention;

[0037] Figure 2 A schematic diagram of the structure of a branch mud pipe in a method for installing a relay pump and discharging mud during shield tunneling provided by an embodiment of the present invention;

[0038] Figure 3 A structural schematic diagram of adding a relay pump to a mud pipeline system in a relay pump installation and mud discharge method during shield tunneling provided by an embodiment of the present invention.

[0039] Reference numerals and descriptions:

[0040] 1. Branch mud pipe; 11. Mud main pipe; 12. Main control switch; 13. First branch pipe; 14. Second branch pipe; 15. Blind plate; 2. Relay pump; 21. First switch; 22. Second switch; 23. First bending section; 24. First straight section; 25. Second bending section; 26. Second straight section; 27. Flexible pipe; 28. Installation base. DETAILED DESCRIPTION

[0041] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0042] In the following, the terms "first" and "second" are used for descriptive purposes only and are not to be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the embodiments of the present disclosure, unless otherwise specified, "multiple" means two or more. In addition, the use of "based on" or "according to" means openness and inclusiveness, because the process, steps, calculations or other actions "based on" or "according to" one or more of the conditions or values ​​may be based on additional conditions or values ​​beyond the described values ​​in practice.

[0043] In order to solve the problem in the prior art that shield tunneling construction needs to be stopped when installing a relay pump, an embodiment of the present invention provides a method for installing a relay pump and discharging mud during shield tunneling.

[0044] like Figures 1 to 3 As shown, a method for discharging slurry from a relay pump 2 without stopping a shield machine includes:

[0045] Step 101 : In combination with the predetermined installation position of the relay pump 2 , when constructing a mud pipeline system, a branch mud pipe is used at the installation position of the relay pump 2 .

[0046] The mud pipeline system includes a slurry inlet pipe and a slurry discharge pipe connected to the shield machine. The slurry inlet pipe is equipped with a slurry inlet pump, and the slurry discharge pipe is equipped with a slurry discharge pump. For tunnels with long distances, due to the limitations of the mud pump's head, flow and other performance, only one slurry inlet pump and one slurry discharge pump are far from meeting the construction requirements of the entire tunnel. This requires adding two relay pumps in the middle of the tunnel when the shield machine excavates to a certain distance to ensure the normal operation of the entire mud and water circulation system.

[0047] Relay pump 2 is mainly composed of a mud pump and its supporting drive control system. As part of the mud-water circulation system, relay pump 2 is remotely operated by the main driver in the shield main control room. Through the relay cooperation of several pumps, the flow rate and pressure of the pumped mud are ensured within the performance allowable range of each pump.

[0048] like Figure 2 As shown, the branch mud pipe 1 includes a mud main pipe 11, a main control switch 12 is provided in the middle of the mud main pipe 11, and a first branch pipe 13 and a second branch pipe 14 are connected and arranged on the mud main pipe 11. The first branch pipe 13 and the second branch pipe 14 are relatively arranged on both sides of the main control switch 12, and the openings of the first branch pipe 13 and the second branch pipe 14 are blocked by a blind plate 15.

[0049] The mud main pipe 11 is formed by splicing two mud pipes with Y-shaped branches, and the splicing point of the two mud pipes is connected through a main control switch 12.

[0050] Step 102: After the shield pipe replacement area reaches the installation position of relay pump 2, Figure 3 As shown, the first switch 21 and the second switch 22 are used to replace the blind plates 15 at the openings of the first branch pipe 13 and the second branch pipe 14 respectively, and the first branch pipe 13 is connected to the slurry inlet of the relay pump 2 to be installed through the first connecting pipe, and the second branch pipe 14 is connected to the slurry outlet of the relay pump 2 through the second connecting pipe, and the relay pump 2 is incorporated into the mud pipeline system.

[0051] The first switch 21 is used to control the connection between the first branch pipe 13 and the first connecting pipe, and the second switch 22 is used to control the connection between the second branch pipe 14 and the second connecting pipe.

[0052] The relay pump 2 is incorporated into the mud pipeline system. Specifically, the first switch 21 and the second switch 22 need to be turned on, and the main control switch 12 needs to be turned off.

[0053] Before the shield pipe replacement area reaches the installation position of the relay pump 2, the openings of the first branch pipe 13 and the second branch pipe 14 are blocked by blind plates 15 to prevent mud from leaking from the openings of the first branch pipe 13 and the second branch pipe 14.

[0054] Specifically, the included angles between the first branch pipe 13, the second branch pipe 14 and the mud main pipe 11 are all 25° to 35°.

[0055] The lengths of the first branch pipe 13 and the second branch pipe 14 are both 70 to 90 cm.

[0056] In this embodiment, the included angles between the first branch pipe 13, the second branch pipe 14 and the mud main pipe 11 are all 30°, and the lengths of the first branch pipe 13 and the second branch pipe 14 are all 80 cm.

[0057] Specifically, the main control switch 12, the first switch 21 and the second switch 22 are all gate valves.

[0058] In order to facilitate the connection between pipelines, the gate valves of the first switch and the second switch are also provided with a mud pipeline with a length of about 50 cm outside.

[0059] During the installation of the gate valve, attention should also be paid to the closing direction of the gate valve to avoid the subsequent steps being unable to proceed due to leakage of the gate valve after the pipeline installation is completed.

[0060] Step 103, a pressure gauge for monitoring the slurry pressure is set at the inlet of the relay pump 2, a torque meter for monitoring the rotation torque of the impeller in the relay pump 2 is set at the motor shaft of the relay pump 2, and an accelerometer for monitoring the vibration intensity of the relay pump 2 during operation is set on the pump body of the relay pump 2.

[0061] Among them, pressure gauges, torque meters and accelerometers are sensors that automatically collect data 24 hours a day and upload real-time monitoring.

[0062] Step 104: Determine whether the relay pump 2 fails based on the monitored slurry pressure, impeller rotation torque, and vibration intensity.

[0063] Specifically, by comparing the collected slurry pressure, impeller rotation torque and vibration intensity values ​​with the threshold value corresponding to the item, it can be determined whether the relay pump 2 fails.

[0064] For example, when the value of the collected vibration intensity exceeds a preset threshold value corresponding to the vibration intensity, it is considered that the relay pump 2 has a fault.

[0065] Step 105 , after determining that the relay pump 2 fails, turn on the main control switch 12 , turn off the first switch 21 and / or the second switch 22 , and switch the mud main pipe 11 to perform mud discharge.

[0066] Specifically, after the relay pump 2 is installed, the mud transportation in this section is realized through the relay pump 2 under normal circumstances. However, when the relay pump 2 fails, the mud main pipe can be temporarily switched to transport the mud, ensuring that the relay pump 2 can be repaired while the shield machine is not shut down.

[0067] Further, such as Figure 3 As shown, when the first connecting pipe includes the first bending section 23 and the first straight section 24; the first branch pipe 13 is connected to the slurry inlet of the relay pump 2 to be installed through the first connecting pipe, specifically including:

[0068] The relay pump 2 is arranged below the branch mud pipe 1, the mud outlet is arranged on the top of the relay pump 2, and the mud inlet is arranged on the side wall of the relay pump 2;

[0069] One end of the first bent section 23 is connected to the first branch pipe 13, the other end of the first bent section 23 is connected to one end of the first straight section 24, the other end of the first straight section 24 is connected to the slurry inlet, and the angle between the first straight section 24 and the horizontal plane is -15°~-20°.

[0070] Further, when the second connecting pipe includes the second bending section 25 and the second straight section 26, the second branch pipe 14 is connected to the slurry outlet of the relay pump 2 through the second connecting pipe, specifically including:

[0071] One end of the second bending section 25 is connected to the slurry outlet, the other end of the second bending section 25 is connected to one end of the second straight section 26, one end of the second straight section 26 is connected to the second branch pipe 14, and the angle between the second straight section 26 and the horizontal plane is 30°~40°.

[0072] Furthermore, in order to improve the docking accuracy between the first bent section 23 and the first straight section 24, and the second bent section 25 and the second straight section 26, and reduce the connection difficulty, the first bent section 23 and the first straight section 24, and the second bent section 25 and the second straight section 26 are connected by a flexible pipe 27.

[0073] The flexible pipe 27 may be a rubber connecting pipe.

[0074] In order to facilitate the user to observe the flow state of the mud, observation windows can be opened on the first connecting pipe and the second connecting pipe, or the flexible pipe 27 can be set to a translucent material.

[0075] Further, according to the monitored slurry pressure, impeller rotation torque and vibration intensity, it is determined whether the relay pump 2 fails, specifically including:

[0076] According to the magnitude of the monitored slurry pressure and the preset pressure value, and the magnitude of the monitored impeller rotation torque and the preset torque value, it is determined whether the relay pump 2 has a blockage fault.

[0077] Specifically, when the monitored slurry pressure exceeds the preset pressure value and at the same time, the monitored impeller rotation torque exceeds the preset torque value, it is considered that the relay pump 2 has a blockage fault.

[0078] According to the monitored vibration intensity and the magnitude of the preset vibration value, it is determined whether the relay pump 2 has a fault of stones mixed in the pump body or stones stuck on the impeller.

[0079] Specifically, when the monitored vibration intensity exceeds the preset vibration value, it is considered that the relay pump 2 has a fault in which stones are mixed into the pump body or stones are stuck on the impeller.

[0080] The sizes of the pressure preset value, torque preset value and vibration preset value are determined based on long-term construction experience.

[0081] Furthermore, while determining whether the relay pump 2 fails based on the monitored slurry pressure, impeller rotation torque and vibration intensity, the method also includes:

[0082] The first preset percentages of the preset pressure value, the preset torque value and the preset vibration value are respectively used as the warning values ​​of the slurry pressure, the impeller rotation torque and the vibration intensity.

[0083] Specifically, the first preset percentage may be 70%.

[0084] After the monitored slurry pressure, impeller rotation torque and vibration intensity reach the warning values ​​of the slurry pressure, impeller rotation torque and vibration intensity respectively, the corresponding warning function is triggered.

[0085] For example: when the monitored slurry pressure exceeds 70% of the preset pressure value, a mud pressure warning signal is issued to remind the staff that there is an abnormal risk of mud pressure and it needs to be eliminated and handled in time.

[0086] Furthermore, while determining whether the relay pump 2 fails based on the monitored slurry pressure, impeller rotation torque and vibration intensity, the method also includes:

[0087] The second preset percentages of the preset pressure value, the preset torque value and the preset vibration value are respectively used as the alarm values ​​of the slurry pressure, the impeller rotation torque and the vibration intensity.

[0088] The second preset percentage is greater than the first preset percentage.

[0089] Specifically, the second preset percentage may be 90%.

[0090] After the monitored slurry pressure, impeller rotation torque and vibration intensity reach the alarm values ​​of the slurry pressure, impeller rotation torque and vibration intensity respectively, the corresponding emergency alarm function is triggered.

[0091] For example, when the monitored vibration intensity exceeds 90% of the preset pressure value, a vibration intensity alarm signal is issued to remind the staff that the vibration intensity is abnormal and that stones are mixed into the pump body or stones are stuck on the impeller. The staff can be alerted to check the abnormality and avoid failure of relay pump 2.

[0092] Further, after determining that the relay pump 2 fails, the method further includes:

[0093] Start the high-pressure flushing device to spray high-pressure water to the first connecting pipe, the second connecting pipe, and the pump body inlet and pump body bottom of the relay pump 2 to flush the mud inside the first connecting pipe and the second connecting pipe, as well as the mud in the impeller, inlet channel and pump body bottom of the relay pump 2.

[0094] Specifically, after the relay pump 2 fails, the sediments in the first connecting pipe, the second connecting pipe and the relay pump 2 can be removed by high-pressure water flushing, thereby improving the internal mud fluidity and solving the problem of mud blockage.

[0095] Furthermore, before the shield pipe replacement area reaches the installation position of the relay pump 2, the method further includes:

[0096] The tunnel internal structure lining is cast in advance, the box culvert is filled densely, and an installation base 28 is constructed at the installation position of the relay pump 2.

[0097] The mounting base 28 is used to fix the relay pump 2 .

[0098] Specifically, after the shield trolley is detached from the area where the relay pump 2 is pre-installed, the lining of the internal structure of the tunnel is poured in advance, the box culvert is filled densely, and an installation base is constructed at the installation position of the relay pump 2. At the same time, the connecting structure is pre-buried. The relay pump 2 can only be installed when the strength of the cast structure meets the design strength.

[0099] Furthermore, before the relay pump 2 is incorporated into the mud pipeline system, the method further includes:

[0100] Debug relay pump 2 to ensure that it operates normally.

[0101] Specifically, after the relay pump 2 is installed at the set position, the first connecting pipe and the second connecting pipe are arranged, and the pipeline is pre-installed first, and reinforcement welding work is performed later. During this period, shield excavation and debugging of the relay pump 2 can be carried out simultaneously.

[0102] The debugging of relay pump 2 is divided into two parts, one is local control debugging, and the other is communication and remote control debugging. During the debugging stage, it is necessary to test the various performances of relay pump 2 to ensure that all parts can work normally.

[0103] For example: 1. After power is supplied, first check whether the components and indicators on the panel are normal. If there are any abnormalities, check the causes and handle them immediately.

[0104] 2. Test whether the direction of the fan and the shaft seal water pump of the drive motor is correct. After confirming that they are correct, disassemble the coupling between the drive motor and the mud pump and test the direction of the drive motor. At this time, you can also test whether the local / remote selection switch can work normally and the interlocking start capability of the mud pump.

[0105] 3. According to the functions to be achieved, set the parameters of the inverter, including acceleration time, deceleration time, low speed frequency, high speed frequency and other parameters.

[0106] After the relay pump 2 is debugged without any problem, adjust each gate valve to integrate the relay pump 2 into the mud pipeline system for operation.

[0107] Furthermore, after the relay pump 2 is incorporated into the mud pipeline system, the method further includes:

[0108] When troubleshooting the relay pump 2, the main control switch is turned on and the first switch and / or the second switch are turned off.

[0109] In the embodiment of the present invention, taking the target tunnel as an example, the total length of the target tunnel is 6270m, the shield excavation diameter is 14.57m, the outer diameter of the tunnel structure is 14.0m, the inner diameter is 12.8m, the segment thickness is 0.6m, and the effective clearance area above the track surface is 83.79m 2The tunnel adopts a single-hole double-track cross-section without a partition wall. A longitudinal through rescue channel with a width of 1.25m and a height of 2.2m is set on both sides. A 0.8m wide staircase is set every 150m along the longitudinal direction of the tunnel to connect the vehicle area and the escape channel under the track. In order to strengthen the primary segment lining structure and enhance the waterproof, fireproof, anti-collision and corrosion resistance of the lining structure, the tunnel is equipped with a 300mm secondary lining. The tunnel shield mainly passes through silty clay, fine round gravel soil, partially interspersed with silty clay or fine sand, weakly weathered tuff, weakly weathered tuff lava and other strata. A total of 505m of weakly weathered rock, with an average strength of 33MPa~54MPa, accounting for 8%; 433m of upper soft and lower hard strata, accounting for 7%, and 5332m of soft soil strata, accounting for 85%. After the shield was started, it excavated 2137m at a slope of -20‰ and reached a vertical height of 42.74m, then excavated 900m at a slope of -6.5‰ and reached a vertical height of 5.85m, and then excavated 3233m at a slope of 3.3‰ and reached a vertical height of 10.67m.

[0110] According to the actual situation of the project and the flow rate and head of the mud pump, this section needs 4 slurry pumps and 6 slurry pumps, a total of 10. The installation of relay pumps using the existing construction method requires a total of 70 days of downtime, which has a huge impact on the construction period and labor costs.

[0111] By adopting the method for installing a relay pump and discharging mud during shield tunneling provided by the embodiment of the present invention, during the installation of the relay pump, the pipeline connection of the pump will not affect the normal tunneling work of the shield machine, and the relay pump can be installed during tunneling.

[0112] When the relay pump fails and needs maintenance, it is only necessary to switch off the first switch and / or the second switch and turn on the main control switch to ensure the normal excavation of the shield machine and reduce the constraints on excavation efficiency caused by the failure of the shield equipment.

[0113] The relay pump installation method according to the present invention can effectively save more than 70 days of construction time in the construction area, reduce labor costs and improve construction efficiency.

[0114] In actual application, the method for installing a relay pump and discharging mud during shield tunneling provided by an embodiment of the present invention does not need to stop shield tunneling construction. It is only necessary to replace the cover plate at the opening of the first branch pipe through the first switch and replace the cover plate at the opening of the second branch pipe through the second switch after the shield pipe replacement area reaches the relay pump installation position; then, the first branch pipe is connected to the slurry inlet of the relay pump through the first connecting pipe, and the second branch pipe is connected to the slurry outlet of the relay pump through the second connecting pipe; controlling the first switch to be turned on can realize the connection between the first branch pipe and the slurry inlet, and controlling the second switch to be turned on can realize the connection between the second branch pipe and the slurry outlet, and at the same time, closing the main control switch can integrate the installed relay pump into the mud pipeline system, thereby realizing the installation of the relay pump while the shield machine is tunneling, saving construction time and improving construction efficiency.

[0115] The relay pump installation and mud discharge method during shield excavation of the present invention can greatly save the construction period of tunnel construction, and can effectively avoid the occurrence of shield shutdown caused by faults in the subsequent construction process, thereby ensuring that the progress of tunnel construction is not affected while ensuring safe and civilized construction.

[0116] The method for installing a relay pump and discharging mud during shield tunneling of the present invention is as follows: after the relay pump is incorporated into the mud pipeline system, a pressure gauge is set at the inlet of the relay pump to monitor the pressure of the incoming slurry in real time; a torque meter is set at the motor shaft of the relay pump to monitor the torque of the impeller rotation in the relay pump; an accelerometer is set on the pump body of the relay pump to monitor the vibration intensity during the operation of the relay pump. Whether the relay pump fails is determined based on the preset thresholds of the real-time monitored slurry pressure, impeller rotation torque, and vibration intensity and the corresponding items; if a relay pump failure is detected, the main control switch is turned on, and the first switch and / or the second switch are turned off at the same time, and the switch is switched to the mud main pipe for slurry distribution. After the relay pump is overhauled, it is switched back to the relay pump branch for slurry discharge. The shield machine does not stop during the whole process, ensuring the construction efficiency of the shield machine.

[0117] The above is only a specific embodiment of the present invention, but the protection scope of the present invention is not limited thereto. Any changes or substitutions within the technical scope disclosed by the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the present invention should be based on the protection scope of the claims.

Claims

1. A method for installing a relay pump and discharging mud during shield tunneling, characterized in that: include: In combination with the predetermined relay pump installation position, when constructing the mud pipeline system, a branch mud pipe is used at the relay pump installation position; the branch mud pipe includes a mud main pipe, which is formed by splicing two mud pipes with Y-shaped branches, and the splicing of the two mud pipes is connected by a main control switch. The main mud pipe is provided with a main control switch in the middle, and a first branch pipe and a second branch pipe connected and arranged on the mud main pipe, the first branch pipe and the second branch pipe are relatively arranged on both sides of the main control switch, and the openings of the first branch pipe and the second branch pipe are both blocked by blind plates; The angles between the first branch pipe, the second branch pipe and the mud main pipe are both 25° to 35°, and the lengths of the first branch pipe and the second branch pipe are both 70 to 90 cm; Before the shield pipe replacement area reaches the relay pump installation position, the tunnel internal structure lining is cast in advance, the box culvert is filled densely, and an installation base is applied at the relay pump installation position; the installation base is used to fix the relay pump; After the relay pump is installed at the set position, the first connecting pipe and the second connecting pipe are arranged, and the pipeline is pre-installed first, and reinforcement welding work is performed later. During this period, shield tunneling and relay pump debugging work can be carried out simultaneously; After the shield pipe replacement area reaches the relay pump installation position, the blind plates at the openings of the first branch pipe and the second branch pipe are replaced by the first switch and the second switch respectively, and the first branch pipe is connected to the slurry inlet of the relay pump to be installed through the first connecting pipe, and the second branch pipe is connected to the slurry outlet of the relay pump through the second connecting pipe, and the relay pump is incorporated into the mud pipeline system; the first switch is used to control the connection between the first branch pipe and the first connecting pipe, and the second switch is used to control the connection between the second branch pipe and the second connecting pipe; The first connecting pipe includes a first bending section and a first straight section; the relay pump is arranged below the branch mud pipe, the slurry outlet is arranged on the top of the relay pump, and the slurry inlet is arranged on the side wall of the relay pump; one end of the first bending section is connected to the first branch pipe, the other end of the first bending section is connected to one end of the first straight section, the other end of the first straight section is connected to the slurry inlet, and the angle between the first straight section and the horizontal plane is -15°~-20°; The second connecting pipe includes a second bent section and a second straight section; one end of the second bent section is connected to the slurry outlet, the other end of the second bent section is connected to one end of the second straight section, one end of the second straight section is connected to the second branch pipe, and the angle between the second straight section and the horizontal plane is 30°~40°; The first bending section and the first straight section, as well as the second bending section and the second straight section are connected via a flexible pipe; A pressure gauge for monitoring the slurry pressure is provided at the inlet of the relay pump, a torque meter for monitoring the rotation torque of the impeller in the relay pump is provided at the motor shaft of the relay pump, and an accelerometer for monitoring the vibration intensity of the relay pump during operation is provided on the pump body of the relay pump; Determine whether the relay pump is faulty based on the monitored slurry pressure, the impeller rotation torque and the vibration intensity; after determining that the relay pump is faulty, turn on the main control switch, turn off the first switch and / or the second switch, and switch the mud main pipe to perform slurry discharge.

2. The method for installing a relay pump and discharging mud during shield tunneling according to claim 1, characterized in that: The determining whether the relay pump has a fault based on the monitored slurry pressure, the impeller rotation torque and the vibration intensity specifically includes: judging whether the relay pump has a blockage fault based on the monitored slurry pressure and the pressure preset value, and the monitored impeller rotation torque and the torque preset value; determining whether the relay pump has a fault in which stones are mixed in the pump body or stones are stuck in the impeller based on the monitored vibration intensity and the vibration preset value.

3. The method for installing a relay pump and discharging mud during shield tunneling according to claim 2, characterized in that: While determining whether the relay pump fails based on the monitored slurry pressure, the impeller rotation torque and the vibration intensity, the method also includes: respectively corresponding the first preset percentages of the pressure preset value, the torque preset value and the vibration preset value as warning values ​​of the slurry pressure, the impeller rotation torque and the vibration intensity; triggering the corresponding warning function after the monitored slurry pressure, the impeller rotation torque and the vibration intensity reach the warning values ​​of the slurry pressure, the impeller rotation torque and the vibration intensity respectively.

4. The method for installing a relay pump and discharging mud during shield tunneling according to claim 3, characterized in that: While determining whether the relay pump fails based on the monitored slurry pressure, the impeller rotation torque and the vibration intensity, the method also includes: respectively corresponding second preset percentages of the pressure preset value, the torque preset value and the vibration preset value as alarm values ​​of the slurry pressure, the impeller rotation torque and the vibration intensity; the second preset percentage is greater than the first preset percentage; after the monitored slurry pressure, the impeller rotation torque and the vibration intensity reach the alarm values ​​of the slurry pressure, the impeller rotation torque and the vibration intensity, respectively, triggering the corresponding emergency alarm function.

5. The method for installing a relay pump and discharging mud during shield tunneling according to claim 1, characterized in that: After determining that the relay pump has failed, the method further includes: starting a high-pressure flushing device to spray high-pressure water onto the first connecting pipe, the second connecting pipe, and the pump body inlet and pump body bottom of the relay pump to flush the mud inside the first connecting pipe and the second connecting pipe, as well as flush the mud on the relay pump impeller, inlet channel and pump body bottom.

6. The method for installing a relay pump and discharging mud during shield tunneling according to claim 1, characterized in that: Before incorporating the relay pump into the mud pipeline system, the method further includes: debugging the relay pump to ensure that the relay pump operates normally.

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