CN-122014268-A - Shield machine normal-pressure warehouse opening operation method adopting balance shield mud for sealing and reinforcing

CN122014268ACN 122014268 ACN122014268 ACN 122014268ACN-122014268-A

Abstract

The invention discloses a normal-pressure opening operation method of a shield machine adopting sealing reinforcement of shield mud, and belongs to the field of shield machine repair. The method comprises the steps of firstly adding pipelines at a discharge port and an injection port which are communicated with a mud storage bin of a shield machine, then preparing balance shield mud, replacing bentonite inherent in the mud storage bin by the aid of the balance shield mud through the added pipelines, pumping the balance shield into the mud storage bin for multiple times through the pipelines added at the injection port until the pressure of the mud storage bin reaches the final preset pressure, filtering and dehydrating the balance shield mud, solidifying to form a self-supporting sealing layer, grading the mud storage bin in a grading depressurization mode, stopping grading depressurization when the pressure of the mud storage bin reaches the preset pressure, and finally starting the mud storage bin to perform required operation under the preset pressure state to finish normal-pressure storage operation of the shield machine. The invention effectively avoids sudden collapse caused by air pressure change, reduces the danger in the operation of the air warehouse and reduces the construction cost.

Inventors

XIE WENBIN
JIANG WEIYU
LIU JIANG
PAN XIAODONG
LI YACHAO
LAN HUIJUN
SUN HONGLEI
WANG HUI
ZHANG RANRAN
XU NA

Assignees

中铁隧道局集团有限公司
浙江工业大学

Dates

Publication Date: 20260512
Application Date: 20260324

Claims (10)

1. The normal-pressure opening operation method for the shield machine adopting the balance shield mud for sealing and reinforcement is characterized by comprising the following steps of: 1) Pipelines are respectively arranged at a discharge port and an injection port which are communicated with a slurry bin of the shield tunneling machine; 2) Preparing clay slurry based on unmodified bentonite, and mixing the clay slurry with a plasticizer to obtain shield mud; 3) Pumping balance shield mud into the mud water bin through a pipeline additionally arranged at the injection port, and stopping pumping the balance shield mud when the pressure in the mud water bin is restored to a first preset pressure, wherein the balance shield mud is pumped into the mud water bin at a constant pressure, and bentonite inherent in the mud water bin is discharged through the pipeline additionally arranged at the discharge port while the balance shield mud is pumped into the mud water bin; 4) Pumping the balance shield mud into the muddy water bin for multiple rounds, wherein the pressure in the muddy water bin reaches the preset pressure of the round when the balance shield mud is pumped into the muddy water bin for each round, the preset pressure is gradually increased along with the increase of the round according to the preset gradient, and the pressure in the muddy water bin is regulated to maintain the preset duration corresponding to the round after the pressure in the muddy water bin is increased to the preset pressure of each round; 5) Step-reducing the mud water bin in a step-reducing mode by carrying out step-reducing on an air cushion bin of the shield machine, and stopping step-reducing when the pressure of the mud water bin reaches a first preset pressure; 6) And opening the mud water bin to perform required operation under the first preset pressure state, and finishing normal-pressure bin opening operation of the shield machine.
2. The method for normal pressure opening operation of a shield machine according to claim 1, wherein in the step 1), pipelines additionally arranged at a discharge port and an injection port are pressure-resistant short and hard pipes; A pipeline arranged at the exhaust port is connected with one end of the exhaust port, a pressure sensor of the exhaust port is arranged at one end of the exhaust port, a first pressure gauge is arranged at the other end of the pipeline, and an emergency valve of the exhaust port is arranged at a position, close to the pressure sensor of the exhaust port, of the pipeline; An injection port pressure sensor is arranged at one end of a pipeline which is additionally arranged at the injection port and is connected with the injection port, a second pressure gauge is arranged at the other end of the pipeline, and an injection port emergency valve is arranged at a position, close to the injection port pressure sensor, on the pipeline; The pressure resistance grades of the outlet pressure sensor, the outlet emergency valve, the first pressure gauge, the injection inlet pressure sensor, the injection inlet emergency valve and the second pressure gauge are not lower than 25kg/cm 2 .
3. The normal-pressure opening operation method of the shield machine according to claim 2, wherein the discharge outlet pressure sensor, the first pressure gauge, the injection inlet pressure sensor and the second pressure gauge are used for reflecting the pressure of the mud water bin and are used as pressure auxiliary checking bases of the mud water bin, and the actual pressure value of the mud water bin is the detection value of the first pressure sensor inherent to the shield machine.
4. The normal-pressure opening operation method of the shield machine according to claim 2, wherein the inherent structure of the shield machine comprises a discharge port valve and an injection port valve, the injection port valve is used for controlling opening and closing of an injection port, the injection port emergency valve is used for controlling on and off of a pipeline additionally arranged at the injection port, the discharge port valve is used for controlling opening and closing of a discharge port, and the discharge port emergency valve is used for controlling on and off of a pipeline additionally arranged at the discharge port.
5. The normal-pressure opening operation method of the shield tunneling machine according to claim 1, wherein in the step 2), unmodified bentonite and water are mixed according to a mass ratio of 1:1.15-3 to obtain clay slurry, the clay slurry and a plasticizer are mixed according to a mass ratio of 12.5-20:1, and stirring is carried out for 15-20min after mixing to obtain shield mud, wherein the slump of the shield mud is 14-16; The unmodified bentonite is clay mineral with montmorillonite as main component, the montmorillonite content in the unmodified bentonite is more than 65%, the relative density of the unmodified bentonite is 2.4-2.8, the melting point of the unmodified bentonite is 1330-1430 ℃, the density of the plasticizer at 25 ℃ is 1.00-1.20 g/cm 3 , and the dynamic viscosity is 10-300 mPa.s.
6. The method for normal pressure opening operation of a shield machine according to claim 4, wherein the outlet valve, the injection port emergency valve and the outlet valve are simultaneously opened when the balance shield mud is injected in the step 3); and (3) when the balance shield mud is injected in the step (4), opening an injection port valve and an injection port emergency valve, and closing an exhaust port valve and an exhaust port valve.
7. The normal-pressure opening operation method of the shield machine according to claim 1, wherein the first preset pressure in the step 3) is 1Bar, and the cycle of the balance shield mud pumped in the step 4) is 4 times; The preset pressure corresponding to the first round is 1.2Bar, and the preset time length corresponding to the first round is 1-3 hours; the preset pressure corresponding to the second round is 1.4Bar, and the preset time length corresponding to the second round is 1-3 hours; the preset pressure corresponding to the third round is 1.6Bar, and the preset time length corresponding to the third round is 1-3 hours; the preset pressure corresponding to the fourth round is 1.8Bar, and the preset time length corresponding to the fourth round is 6-12 hours.
8. The method according to claim 7, wherein the cutter head of the shield machine is intermittently rotated at a rotational speed of 0.1-0.2 rpm while pumping the shield mud when the step 4) is performed for the third time.
9. The method for normal pressure opening operation of a shield machine according to claim 4, wherein in step 5), the outlet valve and the outlet valve are opened, the inlet valve and the inlet emergency valve are closed, and the liquid discharged from the muddy water bin is collected at the pipeline where the outlet is additionally installed; The pressure reduction amplitude of each stage is 0.1-0.2Bar, the pressure is stabilized for 2-4 hours after the pressure reduction of each stage is finished except the pressure reduction of the last stage, when the slurry tank is not abnormally pressure-lost in the pressure stabilizing process and the seepage flow is lower than 0.1L/m 2 h, the pressure reduction of the stage is considered to be finished, the pressure reduction of the next stage is continued, and the pressure is stabilized for not less than 12 hours after the pressure reduction of the last stage is finished.
10. The method according to claim 4, wherein after the normal pressure opening operation of the shield machine is completed, the discharge outlet valve, the injection inlet emergency valve and the discharge outlet valve are simultaneously opened, and the injected balance shield mud or water is pumped into the mud water sump to change the solidified balance shield mud into liquid balance shield mud and discharge the liquid balance shield mud out of the mud water sump, and the sealing of the supporting sealing layer to the cutter head is released, so that the shield machine is restored to the tunneling state.

Description

Shield machine normal-pressure warehouse opening operation method adopting balance shield mud for sealing and reinforcing Technical Field The invention belongs to the field of shield machine repair, and particularly relates to a normal-pressure cabin opening operation method of a shield machine, which adopts sealing reinforcement of shield mud. Background The shield tunneling machine is mainly used for excavating underground tunnels, and is especially used in the fields of urban rail transit, underground pipelines, tunnel engineering and the like. Because of the strong adaptability and safety, the shield method is widely applied to tunnel construction under various geological conditions such as soft soil, clay, sand, rock stratum and the like. In modern underground tunnel engineering, the complex structure of the shield machine is the key of efficient construction. As a core supporting structure of the equipment, the shield main body adopts a large steel pipe to construct a temporary tunnel supporting system, so that a safety space is provided for subsequent operation. The cutter disc system at the forefront bears the heavy duty of breaking rock and opening a channel, and the cutting tools in dense arrangement cut the rock and soil layers by continuous rotation. The power of the whole machine is derived from a propulsion system at the rear part, and thousands of tons of thrust generated by a plurality of groups of hydraulic cylinders drive the shield machine to continuously tunnel. Meanwhile, the soil outlet system connected with the rear part of the cutter head cooperatively works with the belt conveyor through the screw conveyor, and the dregs generated by excavation are discharged out of the tunnel in real time. In the urban tunnel construction process, a shield tunneling machine is generally used. Under the conditions of excessive wear and uneven geology, the cutter and structural members cannot be maintained in time, so that the cutter head of the shield machine is damaged, and normal cyclic tunneling cannot be performed. If the re-pushing is to be realized, the cutterhead needs to be comprehensively repaired and corrected, and the damaged cutter needs to be comprehensively replaced. The main facing problems of cutterhead repair are how to keep the tunnel face stable and reliable during cutterhead repair, ensure the safety and stability of the pipeline on the upper side of the shield machine, ensure the safety and the like of the subway airport fast line close to the shield, and simultaneously ensure the ventilation, material transportation and safe operation in a narrow space in front of the cutterhead. However, in the current practice cases of large quantity of construction of the tunnel by the shield method, a plurality of cases of cutter head and cutter seriously damaged in-warehouse maintenance exist. Because of the high maintenance operation difficulty, the high precision requirement, the long operation time and the high risk of the operation under pressure, the mud water bin is filled with bentonite, the damage degree of the cutterhead and the cutter can not be judged outside the bin, and once the cutterhead and the cutter are required to be replaced integrally, the operation under pressure can not be implemented. Therefore, a method for normal-pressure opening operation of the shield machine is needed to solve the problems. Disclosure of Invention The invention provides a normal-pressure opening operation method for a shield machine, which is reinforced by adopting sealing of shield mud, in order to solve the problems in the prior art. The technical scheme of the invention is as follows: the invention discloses a normal-pressure opening operation method of a shield machine adopting sealing reinforcement of shield mud, which comprises the following steps: 1) Pipelines are respectively arranged at a discharge port and an injection port which are communicated with a slurry bin of the shield tunneling machine; 2) Preparing clay slurry based on unmodified bentonite, and mixing the clay slurry with a plasticizer to obtain shield mud; 3) Pumping balance shield mud into the mud water bin through a pipeline additionally arranged at the injection port, and stopping pumping the balance shield mud when the pressure in the mud water bin is restored to a first preset pressure, wherein the balance shield mud is pumped into the mud water bin at a constant pressure, and bentonite inherent in the mud water bin is discharged through the pipeline additionally arranged at the discharge port while the balance shield mud is pumped into the mud water bin; 4) Pumping the balance shield mud into the muddy water bin for multiple rounds, wherein the pressure in the muddy water bin reaches the preset pressure of the round when the balance shield mud is pumped into the muddy water bin for each round, the preset pressure is gradually increased along with the increase of the round according to the preset gradient, and the pre