CN111255470B - Slurry-soil pressure dual-mode shield system and control method - Google Patents

Abstract

The invention provides a muddy water and soil pressure double-mode shield system and a control method thereof, wherein the muddy water and soil pressure double-mode shield system comprises a shield part, a mud separation trolley and a bentonite mud preparation trolley, wherein the mud separation trolley and the bentonite mud preparation trolley follow behind the shield part; a shield cutter head is arranged at the front end of the shield part, a soil bin is arranged behind the shield cutter head, and an inlet of the screw conveyor is connected into the lower section of the soil bin; a lubricating mud inlet pipe connected to the shield cutter head and a pressure mud inlet pipe connected to the soil bin are also arranged; the screw conveyer is connected with a slurry discharge device, the slurry discharge device is connected with a first circulating pipe, and the first circulating pipe is connected with a lubricating slurry inlet pipe and a pressure slurry inlet pipe. The spiral conveyor is used as a single sludge discharge port outlet of the soil bin, so that the installation space is reduced, seamless switching between a slurry balance shield mode and an earth pressure balance shield mode can be realized, the construction efficiency is improved, and the labor intensity of site construction is greatly reduced.

Description

Slurry-soil pressure dual-mode shield system and control method

Technical Field

The invention relates to the field of shield equipment and construction, in particular to a muddy water-soil pressure dual-mode shield system and a muddy water-soil pressure dual-mode shield method capable of being switched rapidly.

Background

Common shield machines are classified into earth pressure balance type shields and slurry water balance type shields. The basic principle of the earth pressure balance type shield is that a cutter head cuts a soil layer, the cut soil enters a soil cabin, the soil in the soil cabin is discharged by a spiral conveyor in the soil cabin while being balanced with the pressure of an excavation surface, and a soil discharging device arranged at a soil discharging port continuously discharges the soil in a state that the soil discharging amount and the pushing amount are balanced. The basic principle of the slurry balance type shield is that slurry with proper pressure is injected into a sealed cabin of a partition plate arranged in front of the front face of a shield machine and a supporting ring to form a mud film on an excavation face to support a soil body on the front face and realize stability of the excavation face, a cutter disc arranged on the front face is used for cutting the soil body, the residue soil and the slurry are mixed to form high-density slurry, and the high-density slurry is conveyed to the ground by a sludge discharge pump and a pipeline to be treated.

The tunneling modes of the two shield tunneling machines can only be one of the earth pressure balanced type and the muddy water balanced type, so that the working capacity of the shield tunneling machine for adapting to stratum changes is greatly limited, urban rail transit, diversion tunnels and power tunnels in China are developed vigorously at the present stage, geological changes of tunnel crossing areas are large, tunneling difficulty is easy to occur in a large number of complicated sections by the shield tunneling machine in a single tunneling mode, the construction period is influenced, the engineering cost is increased, and adverse effects are caused on various constructions such as urban rail transit.

Chinese patent document CN202707070U describes a dual-mode earth pressure balance and slurry balance composite shield machine, which realizes the switching of earth pressure balance and slurry balance construction modes by switching a rock-collecting crushing box and a conveying belt and matching with a pipeline. The problem that exists is, need to remove the conveyer belt when switching to the balanced construction mode of muddy water, change the broken case of album stone, and need replace the broken case of album stone with the conveyer belt when the balanced construction mode of soil pressure, it is comparatively troublesome to operate. The technical solution of the muddy water-soil pressure dual-mode shield tunneling machine described in chinese patent document CN 110306991 a also has the above technical problems.

Disclosure of Invention

The invention aims to provide a muddy water and soil pressure dual-mode shield system and a muddy water and soil pressure dual-mode shield method, which can be suitable for muddy water balance shield construction and soil pressure balance shield construction at the same time. In the preferred scheme, the working modes of slurry balance shield construction and earth pressure balance shield construction can be quickly switched, the efficiency of slurry circulation treatment can be improved, the economic benefit of slurry circulation can be improved, and the slurry circulation can be automatically switched under different slurry circulation modes.

In order to solve the technical problems, the technical scheme adopted by the invention is as follows: a kind of mud-water soil pressure dual-mode shield system, including shield department, follow the mud separation trolley and bentonite mud preparation trolley behind shield department;

a shield cutter head is arranged at the front end of the shield part, a soil bin is arranged behind the shield cutter head, and an inlet of the screw conveyor is connected into the lower section of the soil bin;

a lubricating mud inlet pipe connected to the shield cutter head and a pressure mud inlet pipe connected to the soil bin are also arranged; the screw conveyer is connected with a slurry discharge device, the slurry discharge device is connected with a first circulating pipe, and the first circulating pipe is connected with a lubricating slurry inlet pipe and a pressure slurry inlet pipe;

the pressure mud inlet pipe is provided with a second valve, and the lubrication mud inlet pipe is provided with a first valve.

In the preferred scheme, a quarrying box is arranged below a discharge port of the spiral conveyor, and an overflow port of the quarrying box is communicated with a first discharge pipe and a first circulating pipe through a second circulating pipe;

a second circulating valve is arranged on the second circulating pipe, a second slurry circulating pump is also arranged on the second circulating pipe, a first discharge valve is arranged on the first discharge pipe, and a first circulating valve is arranged on the first circulating pipe;

and a mud treatment device is arranged at the outlet of the first discharge pipe.

In a preferable scheme, the bottom of the quarrying box is provided with a shutter which can be opened and closed, and the bottom of the quarrying box is provided with a conveying belt.

In the preferred scheme, the mud treatment device comprises a vibrating screen, an outlet of a first discharge pipe is positioned above the vibrating screen, the screen of the vibrating screen is connected with a conveying belt through a chute, a settling tank is arranged below the screen of the vibrating screen, an overflow box body is arranged in the settling tank, an overflow port of the settling tank is connected with a third circulating pipe, and the third circulating pipe is connected with a bentonite mud preparation tank.

In the preferred scheme, a stirring device is arranged in the bentonite slurry preparation tank, a liquid inlet pipe is arranged above the bentonite slurry preparation tank, and a liquid inlet pump is arranged on the liquid inlet pipe;

the bentonite slurry preparation tank is connected with the lubricating slurry inlet pipe through a lubricating slurry pipe, and a lubricating slurry valve is arranged on the lubricating slurry pipe.

In the preferred scheme, the bottom of the quarrying box is inclined, the inclination angle is approximately the same as the inclination angle of the conveying belt, the gate plate is connected with a sliding chute at the bottom of the quarrying box in a sliding manner, and the gate plate is connected with a driving device for driving opening and closing;

the driving device comprises a gear rack mechanism, a lead screw nut mechanism, an air cylinder or a hydraulic cylinder which are driven by a motor.

In a preferred scheme, the slurry discharge device is positioned close to the feeding end of the screw conveyor, and a screen is arranged on the slurry discharge device.

In a preferred embodiment, the structure of the slurry discharge device is: the position that is close to the screw conveyer feed end, the feed end body passes through flange and this body coupling of body, is equipped with row's mud opening on the feed end body, and row's mud open-ended periphery is equipped with the draw-in groove, and row's mud pipe connecting plate fixed mounting is equipped with the flange structure at the end of row's mud pipe connecting plate in the draw-in groove, is equipped with row's mud pipe on the row's mud pipe connecting plate, and row's mud pipe and first circulating pipe intercommunication, the position that row's mud pipe and row's mud pipe connecting plate are connected is equipped with the screen cloth.

In a preferred scheme, a viscometer is arranged on the first circulating pipe, and the slurry discharged from the slurry discharge device can be respectively conveyed to the pressure slurry inlet pipe, the lubrication slurry inlet pipe and the first discharge pipe through the first circulating valve, the first valve, the second valve and the first discharge valve by detecting the viscosity of the slurry;

a soil bin pressure sensor is arranged in the soil bin.

A construction method adopting the muddy water and soil pressure dual-mode shield system comprises the steps that under the working condition of a soil pressure balance shield, a first circulating valve on a first circulating pipe is closed, a flashboard of a quarrying box is opened, the rotating speed of a spiral conveyor is adjusted according to a soil bin pressure sensor arranged in a soil bin, stones at a discharge port of the spiral conveyor are discharged to a conveying belt through the quarrying box, and the soil pressure shield construction is carried out;

under the working condition of a slurry balance shield, starting a first slurry circulating pump, starting a first circulating valve of a first circulating pipe, circularly discharging slurry from a slurry discharging device by the first slurry circulating pump to provide pressure slurry in a soil bin, or providing lubricating slurry for a lubricating slurry inlet pipe by controlling the opening and closing of a first valve, or sending the lubricating slurry to a slurry-water separation device through a first discharge pipe, rotating a screw conveyor to convey stones in the slurry to a quarrying box, conveying overflow slurry of the quarrying box to the pressure slurry inlet pipe or a slurry treatment device, intermittently opening a gate plate at the bottom of the quarrying box, discharging the stones in the quarrying box to a conveying belt, and performing slurry shield construction;

the quick switching of the working condition of the earth pressure balance shield and the working condition of the muddy water balance shield is realized through the steps.

According to the mud-water-soil pressure dual-mode shield system and method, the screw conveyor is used as a single mud discharging port outlet of the soil bin, so that the installation space is reduced, the mud discharging device is arranged at the position, close to the feeding end, of the screw conveyor, and in a mud-water balance shield mode, mud and stones can be quickly separated through the mud discharging device of the screw conveyor, so that a mud discharging process is completed. In the earth pressure balance shield mode, can directly discharge the stone through the bottom of quarrying case, and in the mud water balance shield mode, the quarrying case also can realize mud and stone separation alone, realizes mud cyclic utilization. The mud separation platform truck that sets up can further separate mud at the scene, reduces the mud transportation degree of difficulty, further reduces the pollution of mud to the job site. The invention can realize the automatic control of mud recycling, save resources, reduce energy consumption, realize the seamless switching between the slurry balance shield mode and the earth pressure balance shield mode, improve the construction efficiency and greatly reduce the labor intensity of site construction.

Drawings

The invention is further illustrated by the following examples in conjunction with the accompanying drawings:

FIG. 1 is an overall structure diagram of a shield mode of the slurry scale of the present invention.

Fig. 2 is an overall structural view of a soil pressure balance shield mode of the present invention.

Fig. 3 is a schematic view of the overall structure of the present invention.

Fig. 4 is a partial structure schematic diagram of the quarrying box and the conveyer belt in the invention.

Fig. 5 is a partial structural view of the vibrating screen of the present invention when connected to a conveyor belt.

Fig. 6 is a schematic structural view of a slurry discharge device of the screw conveyor of the present invention.

Fig. 7 is an exploded perspective view of the mud drainage apparatus of the present invention.

In the figure: a shield cutter head 1, a soil bin 2, a pressure slurry inlet pipe 3, a lubricating slurry inlet pipe 4, a screw conveyor 5, a quarrying box 6, a box body 61, a side baffle 62, a shutter opening device 63, a shutter 64, a slurry discharge device 7, a feed end pipe body 71, a connecting flange 72, a screen 73, a sludge discharge pipe connecting plate 74, a sludge discharge pipe 75, a clamping groove 76, a sludge discharge opening 77, a sludge separating trolley 8, a bentonite slurry preparing trolley 9, a conveying belt 10, a vibrating screen 11, a settling tank 12, a bentonite slurry preparing tank 13, a first slurry circulating pump 14, a viscometer 15, a second slurry circulating pump 16, a lubricating slurry pump 17, a liquid inlet pump 18, a first circulating valve 19, a first valve 20, a second valve 21, a lubricating slurry valve 22, a second circulating valve 23, a first discharge valve 24, a second discharge valve 25, a third valve 26, a first circulating pipe 27, a second circulating pipe 28, a first discharge pipe 29, a lubricating mud pipe 30, a third circulating pipe 31, a third circulating pump 32, a soil bin pressure sensor 33 and a mud discharging pipe 34.

Detailed Description

Example 1:

as shown in fig. 1 to 3, a dual-mode shield system for soil and mud pressure comprises a shield portion, a mud separation trolley 8 and a bentonite mud preparation trolley 9 following behind the shield portion; the slurry separation trolley 8 is provided with a slurry separation device for separating slurry and stones on site, so that the slurry can be recycled as much as possible, resources are saved, and energy consumption is reduced. The transportation of the stone slag is convenient, and the mud is prevented from dropping on the road surface in the process of transporting the stone slag. The bentonite slurry preparation trolley 9 is used for preparing bentonite slurry for lubricating and cooling the shield cutter head 1.

A shield cutter head 1 is arranged at the front end of the shield part, a soil bin 2 is arranged behind the shield cutter head 1, and an inlet of a screw conveyor 5 is obliquely connected into the lower section of the soil bin 2; the screw conveyer 5 rotates the shaft blade, and part of the shaft blade is exposed and extends into the soil bin 2. With the structure, the inlet of the screw conveyor 5 is used as the only mud or slag outlet of the soil bin 2, thereby reducing the installation space of other components.

A lubricating slurry inlet pipe 4 connected to the shield cutter head 1 is also arranged and used for lubricating the shield cutter head 1. The pressure mud inlet pipe 3 is connected to the soil bin 2 and is used for conveying mud in the soil bin 2 to balance the pressure of the shield; the screw conveyer 5 is connected with a slurry discharge device 7, the slurry discharge device 7 is connected with a first circulating pipe 27, and the first circulating pipe 27 is connected with a lubricating slurry inlet pipe 4 and a pressure slurry inlet pipe 3;

the pressure slurry inlet pipe 3 is provided with a second valve 21, and the lubrication slurry inlet pipe 4 is provided with a first valve 20. The circulating slurry feed position is switched by controlling the opening and closing states of the second valve 21 and the first valve 20. Preferably, a slurry having a high content of bentonite is fed into the lubricating slurry feed pipe 4, and a slurry having a low content of bentonite is fed into the pressurized slurry feed pipe 3, the high content of bentonite being given by a viscometer 15 provided in the first circulation pipe 27, the viscometer 15 being, for example, a vibratile on-line viscometer by Beijing technologies, Inc., Nameko. By the structure, the mud or the stone slag are discharged by the screw conveyer 5, the mud can be separated from the stone after entering the screw conveyer 5, and the bentonite mud can be fully recycled. The connection relationship is shown in fig. 3, and fig. 3 adopts a simple drawing method for easy observation, so that the connection relationship among the components can be easily understood.

In a preferred scheme, as shown in fig. 4, a quarrying box 6 is arranged below a discharge port of a spiral conveyor 5 and used for realizing the mud-water separation of the second step, an overflow plate is arranged in the quarrying box 6, stone slag at the discharge port falls in a cavity separated by the overflow plate, slurry overflows and enters the other cavity, and an overflow port of the quarrying box 6 is communicated with a first discharge pipe 29 and a first circulating pipe 27 through a second circulating pipe 28;

a second circulating valve 23 is arranged on the second circulating pipe 28, a second slurry circulating pump 16 is also arranged on the second circulating pipe 28, a first discharge valve 24 is arranged on the first discharge pipe 29, and a first circulating valve 19 is arranged on the first circulating pipe 27; the overflowing slurry is conveyed to a slurry treatment device through a second slurry circulating pump 16 or directly recycled to the soil bin 2, and the conveying position of the slurry is controlled through the adjustment of the opening and closing state between a second valve 21 and a first discharge valve 24.

At the outlet of the first discharge pipe 29, a sludge treatment device is provided. With the above-described structure, the present invention can obtain recyclable slurry from three ways depending on the operating conditions, for example, slurry directly recycled from the slurry discharge device 7, and recycled slurry at that position is fed into the pressure slurry inlet pipe 3 and the lubrication slurry inlet pipe 4, wherein the proportion of recycled slurry fed into the lubrication slurry inlet pipe 4 is generally higher. And the circulating mud overflowing from the quarrying box 6 is fed to the locations of the pressure mud intake pipe 3, the lubrication mud intake pipe 4 and the first discharge pipe 29, typically at a higher proportion into the pressure mud intake pipe 3. The slurry discharged from the slurry treatment apparatus is generally fed into the bentonite slurry preparation tank 13 and used together with the bentonite slurry from the liquid feed pump to prepare a new bentonite slurry. Either discharged from the slurry discharge pipe 34 or fed into the lubricating slurry inlet pipe 4 by switching of a valve.

In a preferred embodiment, as shown in fig. 4, a shutter 64 is provided at the bottom of the quarrying box 6, and a conveyor belt 10 is provided at the bottom of the quarrying box 6. By the structure, the opening and closing of the flashboard 64 at the bottom of the quarrying box 6 are controlled, so that the earth pressure balance shield mode and the slurry balance shield mode can be conveniently switched without disassembling related equipment at each time.

In a preferred scheme, as shown in fig. 3 and 5, the mud treatment device comprises a vibrating screen 11, an outlet of a first discharge pipe 29 is positioned above the vibrating screen 11, the screen of the vibrating screen 11 is connected with a conveying belt 10 positioned on one side through a chute, a settling tank 12 is arranged below the vibrating screen 11, an overflow tank body is arranged in the settling tank 12, an overflow port of the settling tank 12 is connected with a third circulating pipe 31, and the third circulating pipe 31 is connected with a bentonite mud preparation tank 13. The vibrating screen 11 preferably adopts a plurality of layers of screens, and screens with different meshes can be replaced according to working conditions. The screen can filter sand grains in the slurry, so that the abrasion to the shield cutter head 1 is reduced. It is further preferred that the underside of the vibrating screen 11 is connected to a cyclone device via a pipeline or a pipeline and a slurry pump, and the slurry is further separated by cyclone to obtain a solvent capable of preparing bentonite slurry.

The preferable scheme is as shown in fig. 3, a stirring device is arranged in the bentonite slurry preparation tank 13, the stirring device adopts a structure that a vertical shaft drives a blade to rotate, a motor for driving is arranged above the bentonite slurry preparation tank 13, a liquid inlet pipe is also arranged above the bentonite slurry preparation tank 13, and a liquid inlet pump 18 is arranged on the liquid inlet pipe; the liquid inlet pipe is connected with ready-prepared bentonite slurry.

The bentonite slurry preparation tank 13 is connected with the lubricating slurry inlet pipe 4 through a lubricating slurry pipe 30, and a lubricating slurry valve 22 is arranged on the lubricating slurry pipe 30. The bentonite slurry preparation tank 13 is used for preparing slurry for lubrication, and the slurry from the lubrication slurry pipe 30 is usually high in concentration and diluted in combination with the separated slurry output from the settling tank 12, thereby reducing the input workload of the lubrication slurry into the pipe 4.

Preferably, as shown in fig. 3 and 4, the bottom of the quarrying box 6 is inclined, the inclination angle is approximately the same as the inclination angle of the conveying belt 10, the gate plate 64 is connected with a chute at the bottom of the quarrying box 6 in a sliding manner, and the gate plate 64 is connected with a driving device for driving the opening and closing; by the structure, the soil pressure balance shield mode and the muddy water balance shield mode can be conveniently switched.

The driving device comprises a gear rack mechanism, a lead screw nut mechanism, an air cylinder or a hydraulic cylinder which are driven by a motor. In the embodiment, a gear rack mechanism is adopted, a rack is installed on the gate plate 64, the rack is positioned outside the side wall of the box body 61, the gate plate 64 and the sliding chute at the bottom of the quarrying box 6 form sealing, and the difficulty of sealing the structure can be reduced by placing the rack outside the side wall of the box body 61. The gear is fixed on the side wall of the box body 61 and driven by an independent motor and a speed reducing mechanism, the gear is meshed with the rack, and travel switches are arranged at two ends of the travel of the flashboard 64 and used for controlling the travel of the motor. The lead screw and nut mechanism is mounted by mounting a nut on the shutter 64, mounting a screw and a motor for driving the screw to rotate on a side wall of the case 61, and positioning the nut outside the side wall of the case 61.

In a preferred scheme, as shown in figures 1-3, the slurry discharge device 7 is positioned close to the feeding end of the screw conveyor 5, and a screen 73 is arranged on the slurry discharge device 7. With this structure, the reuse of slurry can be realized at the shortest distance. Especially in the gravel working condition section, the mud is easy to separate from the stone slag, thereby improving the recovery ratio of the bentonite mud. The position of the mud discharging device 7 can prevent mud from being mixed with sufficient grams of soil and gravels in the screw conveyor 5, and is convenient to separate.

In a preferred embodiment, as shown in fig. 6 and 7, the slurry discharge device 7 has a structure in which: at the position that is close to screw conveyer 5 feed end, feed end body 71 passes through flange 72 and this body coupling of body, is equipped with row's mud opening 77 on feed end body 71, and row's mud opening 77 periphery is equipped with draw-in groove 76, and row's mud pipe connecting plate 74 fixed mounting is at draw-in groove 76, is equipped with the flange structure at the end of row's mud pipe connecting plate 74, is equipped with row's mud pipe 75 on row's mud pipe connecting plate 74, and row's mud pipe 75 and first circulating pipe 27 intercommunication, the position that row's mud pipe 75 and row's mud pipe connecting plate 74 are connected is equipped with screen cloth 73. With this structure, the processing and installation of the slurry discharge device 7 are facilitated. In particular, deformation of the screw conveyor 5 housing caused by direct welding can be avoided.

As shown in FIG. 3, a viscometer 15 is provided on the first circulation pipe 27; generally, the bentonite slurry has higher viscosity, while the ordinary stone powder slurry has lower viscosity, and the slurry discharged from the slurry discharge device 7 can be conveniently conveyed to the pressure slurry inlet pipe 3, the lubrication slurry inlet pipe 4 and the first discharge pipe 29 through the first circulating valve 19, the first valve 20, the second valve 21 and the first discharge valve 24 by detecting the viscosity of the slurry.

As shown in FIGS. 1 to 3, a soil bin pressure sensor 33 is provided in the soil bin 2. The structure is used for controlling the pressure in the soil bin 2.

Example 2:

in fig. 1 to 3, in the construction method using the slurry-soil pressure dual-mode shield system, under the working condition of the soil pressure balance shield, the first circulation valve 19 on the first circulation pipe 27 is closed, the gate plate 64 of the quarrying box 6 is opened, and the rotation speed of the screw conveyor 5 is adjusted according to the soil bin pressure sensor 33 arranged in the soil bin 2, so that the pressure in the soil bin 2 meets the expectation. The stones at the discharge port of the screw conveyor 5 are discharged to a conveying belt 10 through a stone collecting box 6, and the stones or the stone slag are conveyed to the outside of the tunnel from the subsequent conveying belt 10 or a slag conveying trolley for earth pressure shield construction;

under the working condition of the slurry balance shield, the first slurry circulating pump 14 is started, the first circulating valve 19 of the first circulating pipe 27 is opened, the first slurry circulating pump 14 circularly discharges slurry from the slurry discharge device 7 to provide pressure slurry for the soil bin 2, or lubricating slurry is provided for the lubricating slurry inlet pipe 4 by controlling the opening and closing of the first valve 20, or the lubricating slurry is sent to the slurry separation device through the first discharge pipe 29. Preferably, the selection of the particular switch is selected by the viscosity detected by the viscometer 15. Normally, the slurry with higher viscosity, i.e. the slurry with higher content of bentonite, is delivered to the lubricating slurry inlet pipe 4 for lubricating and cleaning the shield cutter head 1. And the mud with lower viscosity is used for conveying to the pressure mud inlet pipe 3 or the first discharge pipe 29 for mud-water pressure balance, or is used for preparing bentonite mud after being treated by a mud separating device, or is conveyed to the outside of the hole after being used up. And the mud with the lowest viscosity is used for being conveyed to a mud separation device, and the mud which is close to clean water is obtained and then conveyed to a bentonite mud preparation tank 13 for preparing the bentonite mud.

The screw conveyer 5 rotates to convey stones in the slurry to the quarrying box 6, and the overflow slurry of the quarrying box 6 is conveyed to the pressure slurry inlet pipe 3 for slurry-water pressure balance or conveyed to a slurry treatment device for slurry-water separation, so that slurry close to clean water is obtained. Intermittently opening the gate plate 64 at the bottom of the quarrying box 6, discharging stones in the quarrying box 6 to the conveyer belt 10, and performing slurry shield construction;

the quick switching of the working condition of the earth pressure balance shield and the working condition of the muddy water balance shield is realized through the steps.

The above-described embodiments are merely preferred embodiments of the present invention, and should not be construed as limiting the present invention, and features in the embodiments and examples in the present application may be arbitrarily combined with each other without conflict. The protection scope of the present invention is defined by the claims, and includes equivalents of technical features of the claims. I.e., equivalent alterations and modifications within the scope hereof, are also intended to be within the scope of the invention.

Claims (4)

1. The utility model provides a dual mode shield structure system is pressed to muddy water soil which characterized by: the shield system comprises a shield part, a slurry separation trolley (8) and a bentonite slurry preparation trolley (9) which follow the shield part;

a shield cutter head (1) is arranged at the front end of the shield part, a soil bin (2) is arranged behind the shield cutter head (1), a soil bin pressure sensor (33) is arranged in the soil bin (2), and an inlet of a screw conveyor (5) is connected into the lower section of the soil bin (2);

a lubricating mud inlet pipe (4) connected to the shield cutter head (1) and a pressure mud inlet pipe (3) connected to the soil bin (2) are also arranged; the screw conveyor (5) is connected with the slurry discharge device (7), the slurry discharge device (7) is connected with the first circulating pipe (27), and the first circulating pipe (27) is connected with the lubricating slurry inlet pipe (4) and the pressure slurry inlet pipe (3);

a second valve (21) is arranged on the pressure slurry inlet pipe (3), and a first valve (20) is arranged on the lubricating slurry inlet pipe (4);

a quarrying box (6) is arranged below a discharge port of the spiral conveyor (5), and an overflow port of the quarrying box (6) is communicated with a first discharge pipe (29) and a first circulating pipe (27) through a second circulating pipe (28);

a second circulating valve (23) is arranged on the second circulating pipe (28), a second slurry circulating pump (16) is also arranged on the second circulating pipe (28), a first discharge valve (24) is arranged on the first discharge pipe (29), and a first circulating valve (19) is arranged on the first circulating pipe (27);

a mud treatment device is arranged at the outlet of the first discharge pipe (29);

the bottom of the quarrying box (6) is provided with a flashboard (64) which can be opened and closed, and the bottom of the quarrying box (6) is provided with a conveyer belt (10);

the mud treatment device comprises a vibrating screen (11), an outlet of a first discharge pipe (29) is positioned above the vibrating screen (11), the screen of the vibrating screen (11) is connected with a conveying belt (10) through a chute, a settling tank (12) is arranged below the vibrating screen (11), an overflow tank body is arranged in the settling tank (12), an overflow port of the settling tank (12) is connected with a third circulating pipe (31), and the third circulating pipe (31) is connected with a bentonite mud preparation tank (13);

the bottom of the quarrying box (6) is inclined, the inclination angle is approximately the same as the inclination angle of the conveying belt (10), the gate plate (64) is in sliding connection with a sliding chute at the bottom of the quarrying box (6), and the gate plate (64) is connected with a driving device for driving opening and closing;

the driving device comprises a gear rack mechanism, a lead screw nut mechanism, an air cylinder or a hydraulic cylinder which are driven by a motor;

the slurry discharge device (7) is positioned close to the feed end of the screw conveyor (5), and a screen (73) is arranged on the slurry discharge device (7);

a viscometer (15) is provided on the first circulation pipe (27), and by detecting the viscosity of the slurry, the slurry discharged from the slurry discharge device (7) can be transported to the pressure slurry inlet pipe (3), the lubrication slurry inlet pipe (4), and the first discharge pipe (29) by the first circulation valve (19), the first valve (20), the second valve (21), and the first discharge valve (24), respectively.

2. The dual-mode shield system for soil and mud pressure according to claim 1, wherein: a stirring device is arranged in the bentonite slurry preparation tank (13), a liquid inlet pipe is arranged above the bentonite slurry preparation tank (13), and a liquid inlet pump (18) is arranged on the liquid inlet pipe;

the bentonite slurry preparation tank (13) is connected with the lubricating slurry inlet pipe (4) through a lubricating slurry pipe (30), and a lubricating slurry valve (22) is arranged on the lubricating slurry pipe (30).

3. The dual-mode shield system for soil and mud pressure according to claim 1, wherein: the structure of the slurry discharge device (7) is as follows: at the position that is close to screw conveyer (5) feed end, feed end body (71) are connected with body (78) through flange (72), be equipped with row's mud opening (77) on feed end body (71), the periphery of row's mud opening (77) is equipped with draw-in groove (76), row's mud pipe connecting plate (74) fixed mounting is in draw-in groove (76), end at row's mud pipe connecting plate (74) is equipped with the flange structure, be equipped with row's mud pipe (75) on row's mud pipe connecting plate (74), row's mud pipe (75) and first circulating pipe (27) intercommunication, the position that row's mud pipe (75) and row's mud pipe connecting plate (74) are connected is equipped with screen cloth (73).

4. A construction method using the muddy water-soil pressure dual-mode shield system as set forth in any one of claims 1 to 3, characterized in that:

under the working condition of an earth pressure balance shield, closing a first circulating valve (19) on a first circulating pipe (27), opening a gate plate (64) of a quarrying box (6), adjusting the rotating speed of a screw conveyor (5) according to an earth bin pressure sensor (33) arranged in an earth bin (2), discharging stones at a discharge port of the screw conveyor (5) to a conveying belt (10) through the quarrying box (6), and performing earth pressure shield construction;

under the working condition of a slurry balance shield, starting a first slurry circulating pump (14), starting a first circulating valve (19) of a first circulating pipe (27), circularly discharging slurry from a slurry discharging device (7) by the first slurry circulating pump (14) to provide pressure slurry for a soil bin (2), or providing lubricating slurry for a lubricating slurry inlet pipe (4) by controlling the opening and closing of a first valve (20), or sending the lubricating slurry to a slurry separation device through a first discharging pipe (29), rotating a screw conveyor (5) to convey stones in the slurry to a quarrying box (6), conveying overflow slurry of the quarrying box (6) to a pressure slurry inlet pipe (3) or a slurry treatment device, intermittently opening a gate plate (64) at the bottom of the quarrying box (6), and discharging stones in the quarrying box (6) to a conveying belt (10) to carry out slurry shield construction;

the quick switching of the working condition of the earth pressure balance shield and the working condition of the muddy water balance shield is realized through the steps.

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