A mud-water balance shield stone-taking device and construction method

Abstract

The present invention discloses a slurry shield stone-removing device, comprising a shield cabin, a slurry inlet pipe, a slurry discharge pipe, a screw conveyor and a stone storage and retrieval mechanism; the position where the slurry inlet pipe is connected to the shield cabin is higher than the position where the slurry discharge pipe is connected to the shield cabin; the shield cabin is divided into an air cushion cabin and a slurry cabin, the air cushion cabin is formed by injecting gas into the shield cabin by a pneumatic device, and the air cushion cabin is connected to an air intake and exhaust device; the inlet of the first section of the screw conveyor is arranged at the bottom of the slurry cabin; the second section of the screw conveyor is connected to the tail of the first section of the screw conveyor; the stone storage and retrieval mechanism comprises a belt, a first stone storage and retrieval unit, a second stone storage and retrieval unit and a third stone storage and retrieval unit. The present invention also discloses a construction method matched with the stone-removing device. The screw conveyor of the present invention has a fast stone-removing speed, which not only solves the problem of "delayed discharge" of pebbles at the bottom of the slurry cabin, but also reduces the amount of slag carried by the slurry, can effectively improve the shield construction progress, reduce the construction cost of the slurry shield, and has a great promotion prospect.

Description

Technical Field

[0001] The invention relates to a slurry shield design, in particular to a slurry shield stone taking device and a construction method. Background Art

[0002] At present, shield construction mainly adopts earth pressure balance shield and slurry balance shield. The main advantages of slurry balance shield construction are that the pressure of its soil compartment is controlled by air pressure, the pressure control is accurate, the surface settlement is small during construction, and there will be no gushing due to the connection between the soil compartment and the mud pipe; the disadvantages are that the mud-water separation system on the working shaft occupies a large area, the shield equipment cost is high, the construction power consumption is large, and the construction progress is affected by the capacity of the mud separation system. Slurry balance shield is generally used in the construction of large and medium diameter tunnels with abundant groundwater and very high surface settlement requirements. Slurry balance shield is mostly used in large-diameter shield construction and under-river crossing construction.

[0003] The slurry shield crossing rivers has shown many inadaptability in the construction of shields in sandy and gravel formations (such as the Lanzhou slurry shield crossing the Yellow River and the Luoyang slurry shield crossing the Luo River). Since the slurry shield uses mud as a carrier, it carries the slag in the pipeline and transports it to the outside of the tunnel, and then uses a mud-water separation system to separate it. Since large-sized pebbles cannot be pumped or suspended in mud, there are strict restrictions on the particle size that can be pumped by the mud pump.

[0004] The content of floating pebbles in the sand and gravel strata is high (sometimes up to 70%) and the particle size is large (the maximum particle size can reach 600mm). The pebbles excavated by the cutter on the slurry balance shield cutter head cannot be suspended in the mud due to their high density and sink directly to the bottom of the mud and water tank. The pebbles cannot be discharged as soon as possible, which will cause the accumulation of pebbles at the bottom of the mud and water tank, forming a "delayed discharge" phenomenon, which will lead to the shield being unable to advance normally. The shield can only advance normally after the "delayed discharge" pebbles are processed.

[0005] The methods commonly used by slurry shield in gravel and sand formations are to increase the mud flow rate and reduce the amount of pebbles per unit volume; add quarrying boxes, where large pebbles are deposited and taken out manually; add stone crushers to improve the ability to crush pebbles. Although the above measures are taken, the excavation of slurry shield in gravel and sand formations is very unsatisfactory. Due to the low ability to crush or collect pebbles, the serious "delayed discharge" of pebbles in the slurry compartment, the shield excavation speed is slow (about 10mm / min), which ultimately leads to slow progress of shield excavation construction (sometimes only up to 5 meters per day) and extremely high construction costs.

[0006] Therefore, this field needs to develop a new device to deal with the problem of pebble "delayed discharge" to solve the problem of pebble "delayed discharge" in the slurry compartment of a slurry shield during construction in sandy and gravel strata, thereby achieving the purpose of improving the shield construction progress. Summary of the invention

[0007] The technical problem to be solved by the present invention is to provide a slurry shield stone taking device and construction method. On the basis of the slurry shield design, a stone taking unit is added to quickly take out the deposited pebbles at the bottom of the slurry tank of the slurry shield through a screw conveyor, which solves the problem of "delayed discharge" of pebbles in the slurry tank of the slurry shield when constructing in sandy and gravel strata, and can effectively improve the shield construction progress.

[0008] The objective of the present invention is achieved through the following technical solutions:

[0009] A slurry shield stone-taking device comprises a shield cabin, a slurry inlet pipe, a slurry discharge pipe, a screw conveyor and a stone storage and taking mechanism; the position where the slurry inlet pipe is connected to the shield cabin is higher than the position where the slurry discharge pipe is connected to the shield cabin; the shield cabin is divided into an air cushion cabin and a slurry cabin, the air cushion cabin is formed by injecting gas into the shield cabin by a pneumatic device, and the air cushion cabin is connected to an air inlet and an exhaust device;

[0010] The screw conveyor includes a first section screw conveyor and a second section screw conveyor. The inlet of the first section screw conveyor is arranged at the bottom of the mud and water tank, and the first section screw conveyor is arranged obliquely from bottom to top; the second section screw conveyor is connected to the tail of the first section screw conveyor;

[0011] The stone storage and retrieval mechanism includes a belt, a first stone storage and retrieval unit, a second stone storage and retrieval unit and a third stone storage and retrieval unit; the first stone storage and retrieval unit includes a first upper gate, a first lower gate and a first stone storage box; the second stone storage and retrieval unit includes a second upper gate, a second lower gate and a second stone storage box; the third stone storage and retrieval unit includes a third upper gate, a third lower gate and a third stone storage box; the belt is arranged under the first stone storage and retrieval unit, the second stone storage and retrieval unit and the third stone storage and retrieval unit.

[0012] As a preferred embodiment, the air cushion cabin and the mud and water cabin are arranged in the front shield.

[0013] As a preferred embodiment, the air intake and exhaust device is arranged above the air cushion cabin to facilitate air intake and exhaust.

[0014] As a preferred embodiment, the rotating shaft of the first section of the screw conveyor is connected to the annular drive.

[0015] As a preferred embodiment, the rotating shaft of the second screw conveyor is connected to the screw conveyor drive.

[0016] As a preferred embodiment, the first section screw conveyor and the second section screw conveyor are shaft screw conveyors.

[0017] As a preferred embodiment, the air cushion chamber is connected to the second screw conveyor barrel by a pipeline, and the same pressure gas enters the air cushion chamber, the rear part of the first screw conveyor barrel and the second screw conveyor barrel.

[0018] As a preferred embodiment, the first stone storage box, the second stone storage box and the third stone storage box are connected to the air supply pipeline.

[0019] As a preferred embodiment, the first stone storage box, the second stone storage box and the third stone storage box are made of transparent material.

[0020] A method for constructing a slurry shield stone excavation device, wherein before the slurry shield excavation, a first upper gate, a first lower gate, a second upper gate, a second lower gate, a third upper gate and a third lower gate are all in a closed state;

[0021] When the slurry shield starts to excavate, the first upper gate and the third upper gate are opened, and the first section of the screw conveyor, the second section of the screw conveyor and the belt are started at the same time;

[0022] The pebbles containing mud in the lower part of the mud and water tank are transported backwards through the screw conveyor shaft. When the pebbles containing mud reach the second air-slurry dividing line, the gas pressure prevents the mud in the pebbles from continuing to move upwards.

[0023] Steps for accessing stones:

[0024] The first upper gate and the third upper gate are in the open state, and the pebbles enter the first stone storage box. When the first stone storage box is nearly full of pebbles (for example, 80%-90% of the volume of the first stone storage box), the second upper gate is opened and the first upper gate is closed (the pebbles enter the second stone storage box through the second screw conveyor); the first lower gate is opened, and the pebbles in the first stone storage box fall onto the running belt and are transported away by the belt; when there are no pebbles in the first stone storage box, the first lower gate is closed;

[0025] When the second stone storage box is nearly full (e.g. 80%-90% of the volume of the second stone storage box), the first upper gate is opened, the second upper gate is closed (most of the pebbles enter the first stone storage box through the spiral shaft, and a small number of pebbles may enter the third stone storage box), the second lower gate is opened, and the pebbles in the second stone storage box fall onto the running belt and are transported away by the belt; when there are no pebbles in the second stone storage box, the second lower gate is closed;

[0026] The first stone storage box and the second stone storage box work cyclically and alternately;

[0027] When the third stone storage box is nearly full of pebbles (e.g., 80%-90% of the volume of the third stone storage box), the first screw conveyor shaft and the second screw conveyor stop working, the third upper gate and the upper gate corresponding to the stone storage box with pebbles are closed, and then the third lower gate and the lower gate corresponding to the stone storage box with pebbles are opened; when the stone storage box is free of pebbles, the corresponding lower gate is closed;

[0028] This completes the stone storage and retrieval steps;

[0029] Then, the stone storage and retrieval step is performed. When the stone storage and retrieval step is performed, the first screw conveyor and the second screw conveyor need to be started at the same time;

[0030] Under normal circumstances, the stone depositing and withdrawing steps are repeated until the stone depositing and withdrawing needs to be stopped.

[0031] The beneficial effect of the present invention is that by adding a screw conveyor stone taking unit to the slurry shield machine, the deposited pebbles at the bottom of the slurry tank are directly taken out by the screw conveyor, and the pebbles do not need to be crushed and carried by mud pumping. The screw conveyor has a fast stone taking speed, which not only solves the problem of "delayed discharge" of pebbles at the bottom of the slurry tank and improves the shield excavation speed, but also reduces the amount of slag carried by the mud, which can effectively improve the shield construction progress and reduce the construction cost of the slurry shield, and has a great promotion prospect. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present invention and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0033] Figure 1 This is a schematic diagram of the slurry shield and stone removal device;

[0034] In the figure, 1-cutter head, 2-mud and water tank, 3-front shield, 4-air cushion cabin, 5-middle shield, 6-propulsion cylinder, 7-first air-slurry dividing line, 8-slurry inlet pipe, 9-slurry discharge pipe, 10-segment, 11-shield tail, 12-assembly machine, 13-second air-slurry dividing line, 14-annular drive, 15-first section of screw conveyor, 16-first upper gate, 17-first lower gate, 18-first stone storage box, 19-second section of screw conveyor, 20-second upper gate, 21-second lower gate, 22-second stone storage box, 23-third upper gate, 24-third lower gate, 25-third stone storage box, 26-screw machine drive, 27-belt. DETAILED DESCRIPTION

[0035] The technical solution of the present invention is further described in detail below in conjunction with the accompanying drawings, but the protection scope of the present invention is not limited to the following.

[0036] In order to make the purpose, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention. Therefore, the following detailed description of the embodiments of the present invention provided in the drawings is not intended to limit the scope of the invention claimed for protection, but merely represents the selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of the present invention.

[0037] In the description of the present invention, it is necessary to understand that the terms indicating orientation or positional relationship are based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0038] In the present invention, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0039] In the present invention, unless otherwise clearly specified and limited, if a first feature exists above or below a second feature, it may include that the first and second features are in direct contact, or it may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, the first feature is above, above and above the second feature, including that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. If the first feature exists below, below and below the second feature, it includes that the first feature is directly below and obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0040] Embodiment 1

[0041] like Figure 1As shown, a slurry balance shield stone-taking device comprises a shield cabin, a slurry inlet pipe 8, a slurry discharge pipe 9, a screw conveyor and a stone storage and taking mechanism; the position where the slurry inlet pipe 8 is connected to the shield cabin is higher than the position where the slurry discharge pipe 9 is connected to the shield cabin; the shield cabin is divided into an air cushion cabin 4 and a slurry cabin 2, the air cushion cabin 4 is formed by injecting gas into the shield cabin by a pneumatic device, and the air cushion cabin 4 is connected to an air intake and exhaust device;

[0042] The screw conveyor includes a first screw conveyor 15 and a second screw conveyor 19. The inlet of the first screw conveyor 15 is arranged at the bottom of the mud and water tank 2. Furthermore, the length of the first screw conveyor 15 extending into the mud and water tank 2 is 1 / 5-2 / 3 of the width of the mud and water tank 2. The first screw conveyor 15 is arranged to be inclined from bottom to top (for specific inclination direction, see Figure 1 ); the second section screw conveyor 19 is connected to the tail of the first section screw conveyor 15; the connection between the second section screw conveyor 19 and the first section screw conveyor 15 must ensure that the slag or slag can be smoothly transferred from the first section screw conveyor 15 to the second section screw conveyor 19.

[0043] The stone storage and retrieval mechanism includes a belt 27, a first stone storage and retrieval unit, a second stone storage and retrieval unit and a third stone storage and retrieval unit; the first stone storage and retrieval unit includes a first upper gate 16, a first lower gate 17 and a first stone storage box 18; the second stone storage and retrieval unit includes a second upper gate 20, a second lower gate 21 and a second stone storage box 22; the third stone storage and retrieval unit includes a third upper gate 23, a third lower gate 24 and a third stone storage box 25; the belt 27 is arranged under the first stone storage and retrieval unit, the second stone storage and retrieval unit and the third stone storage and retrieval unit.

[0044] The present invention adds a screw conveyor stone taking unit to the slurry shield machine. The deposited pebbles at the bottom of the slurry tank 2 are directly taken out by the screw conveyor, and the pebbles do not need to be crushed or pumped with mud. The screw conveyor has a fast stone taking speed, which not only solves the problem of "delayed discharge" of pebbles at the bottom of the slurry tank 2 and improves the shield excavation speed, but also reduces the amount of slag carried by the mud, which can effectively improve the shield construction progress and reduce the slurry shield construction cost, and has a great promotion prospect.

[0045] Embodiment 2

[0046] The slurry shield is composed of a cutter head 1, a front shield 3, a middle shield 5, a propulsion cylinder 6, a slurry inlet pipe 8, a slurry discharge pipe 9, a shield tail 11, an assembly machine 12, and a rear supporting trolley. The soil compartment (shield compartment) of the front shield 3 is divided into two spaces, a slurry compartment 2 and an air cushion compartment 4, by a partition. The stone extraction structure of the slurry shield is composed of a ring drive 14, a first section screw conveyor 15, a first upper gate 16, a first lower gate 17, a first stone storage box 18, a second section screw conveyor 19, a second upper gate 20, a second lower gate 21, a second stone storage box 22, a third upper gate 23, a third lower gate 24, a third stone storage box 25, a screw drive (screw drive 26), a belt 27, and other components. In order to ensure continuous slag discharge from the two sections of the screw conveyor, the rotation shaft of the first section screw conveyor 15 is designed with a ring drive 14. The rotating shaft of the second section screw conveyor 19 is connected to the screw drive 26. The screw machine drive 26 is a screw drive assembly including a rotary motor. The first screw conveyor 15 and the second screw conveyor 19 are shaft screw conveyors.

[0047] The cutter head 1 is provided with a roller cutter and a slag inlet, the cutter head 1 is connected to a cutter head support arm, the cutter head support arm is connected to a main drive, and the cutter head support arm rotates under the drive of the main drive. The air cushion cabin 4 and the mud and water cabin 2 are arranged in the front shield 3. The air intake and exhaust device is arranged above the air cushion cabin 4 to facilitate air intake and exhaust.

[0048] The air cushion chamber 4 is connected to the second section screw conveyor 19 by a pipeline, and the same pressure gas enters the air cushion chamber 4, the rear of the first section screw conveyor 15 and the second section screw conveyor 19. Due to the effect of air pressure, the first air-slurry dividing line 7 and the second air-slurry dividing line 13 are on the same plane. The first air-slurry dividing line 7 and the second air-slurry dividing line 13 are higher than the lowest slurry inlet pipe 8 entrance of the air cushion chamber 4 and lower than the bottom of the second section screw conveyor 19.

[0049] The first stone storage box 18, the second stone storage box 22 and the third stone storage box 25 are connected to the air supply pipeline. In order to prevent the gas from entering the stone storage box and causing a large pressure fluctuation in the air cushion cabin 4 when the first upper gate 16, the second upper gate 20 or the third upper gate 23 is opened, before the lower gate is closed and the upper gate is opened (before the first lower gate 17 is closed and the first upper gate 16 is opened, or before the second lower gate 21 is closed and the second upper gate 20 is opened, or before the third lower gate 24 is closed and the third upper gate 23 is opened), the stone storage box should be filled with gas of the same pressure as the air cushion cabin 4 through the air supply pipeline.

[0050] The first stone storage box 18, the second stone storage box 22 and the third stone storage box 25 are made of transparent material, so that the filling state of the pebbles in the stone storage boxes can be observed through a camera.

[0051] Before the slurry shield is excavated, the air pressure at the air cushion cabin 4 is adjusted to the required value range, and the slurry inlet pipe 8 is started to feed the slurry and the slurry discharge pipe 9 is started to discharge the slurry, and the slurry inlet and discharge are kept balanced. Most of the slurry from the slurry inlet pipe 8 enters the mud and water cabin 2, and a small part enters the lower part of the first air-slurry dividing line 7 of the air cushion cabin 4. The cutter head 1 is started to rotate, and the cutter on the cutter head 1 cuts the sand and pebbles, and the cut sand and pebbles enter the mud and water cabin 2. The thrust cylinder 6 is started, and the thrust cylinder 6 pushes forward against the front end surface of the pipe segment 10. The sand and pebbles entering the mud and water cabin 2 are mixed with the slurry in the mud and water cabin 2. After the sand is mixed with the mud in the mud and water cabin 2, the sand is suspended in the mud and is directly pumped out through the slurry discharge pipe 9 by the slurry discharge pump through the pipeline to be separated outside the tunnel. Due to its high density, the pebbles are directly deposited in the lower part of the mud and water cabin 2. The two sections of the screw conveyor (the first section of the screw conveyor 15 and the second section of the screw conveyor 19) are directly started and rotated, and the pebbles at the bottom of the mud and water tank 2 are directly discharged to the belt 27 through the screw conveyor, and transported to the tail of the shield trolley through the belt 27, and directly fall into the slag car, and finally transported to the working pit by the battery car, and then lifted to the ground by the gantry crane and poured into the slag pit. When the shield machine advances a certain distance (generally the length of the pipe segment 10), it stops advancing, and the pipe segment 10 assembly machine 12 is used to assemble multiple pipe segments 10 of a ring of pipe segments 10 into a ring in sequence. Then excavation and assembly are carried out again.

[0052] Embodiment 3

[0053] This embodiment discloses a method for constructing a slurry shield stone-taking device. Before the slurry shield is driven, the first upper gate 16, the first lower gate 17, the second upper gate 20, the second lower gate 21, the third upper gate 23 and the third lower gate 24 are all in a closed state.

[0054] When the slurry shield starts to excavate, the first upper gate 16 and the third upper gate 23 are opened, and the first screw conveyor 15, the second screw conveyor 19 and the belt 27 are started at the same time;

[0055] The mud-containing pebbles at the bottom of the mud and water tank 2 are transported backwards through the screw conveyor axis. When the mud-containing pebbles reach the second air-slurry dividing line 13, the gas pressure prevents the mud in the pebbles from continuing to move upward. Since the air cushion cabin 4 is connected to the upper space of the second air-slurry dividing line 13, the first air-slurry dividing line 7 and the second air-slurry dividing line 13 are always on the same horizontal plane.

[0056] Steps for accessing stones:

[0057] The first upper gate 16 and the third upper gate 23 are in an open state, and the pebbles enter the first stone storage box 18 through the spiral shaft. When the first stone storage box 18 is observed to be nearly full (for example, 80%-90% of the volume of the first stone storage box 18) of pebbles through a camera (the camera is installed beside the first stone storage box 18, the second stone storage box 22 and the third stone storage box 25 so as to be able to observe the internal conditions of the first stone storage box 18, the second stone storage box 22 and the third stone storage box 25), the second upper gate 20 is opened, and the first upper gate 16 is closed (the pebbles enter the second stone storage box 22 through the second section of the screw conveyor 19); the first lower gate 17 is opened, and the pebbles in the first stone storage box 18 fall onto the running belt 27 and are transported away by the belt 27; after there are no pebbles in the first stone storage box 18, the first lower gate 17 is closed;

[0058] When the second stone storage box 22 is observed by the camera to be nearly full of pebbles (for example, 80%-90% of the volume of the second stone storage box 22), the first upper gate 16 is opened, the second upper gate 20 is closed (most of the pebbles enter the first stone storage box 18 through the spiral shaft, and a small number of pebbles may enter the third stone storage box 25), the second lower gate 21 is opened, and the pebbles in the second stone storage box 22 fall onto the running belt 27 and are transported away by the belt 27; when there are no pebbles in the second stone storage box 22, the second lower gate 21 is closed;

[0059] The first stone storage box 18 and the second stone storage box 22 work cyclically and alternately;

[0060] When the camera observes that the third stone storage box 25 is nearly full of pebbles (for example, 80%-90% of the volume of the third stone storage box 25), the first screw conveyor 15 shaft and the second screw conveyor 19 stop working, the third upper gate 23 and the upper gates (first upper gate 16 and / or second upper gate 20) corresponding to the stone storage box with pebbles (first stone storage box 18 and / or second stone storage box 22) are closed, and then the third lower gate 24 and the lower gates (first lower gate 17 and / or second lower gate 21) corresponding to the stone storage box with pebbles (first stone storage box 18 and / or second stone storage box 22) are opened, and when the stone storage box (first stone storage box 18 and / or second stone storage box 22 and / or third stone storage box 25) is free of pebbles, the corresponding lower gates (first lower gate 17 and / or second lower gate 21 and / or third lower gate 24) are closed;

[0061] This completes the stone storage and retrieval steps;

[0062] Then, the stone storage and access step is performed. When the stone storage and access step is performed, the first screw conveyor 15 and the second screw conveyor 19 need to be started at the same time (that is, the first screw conveyor 15 and the second screw conveyor 19 are in the open state);

[0063] Normally, repeatedly perform the stone access step until the stone access needs to be stopped (i.e., the stone access step can be artificially terminated). When the stone storage box with pebbles is found, the corresponding lower gate needs to be opened to take out the pebbles in the stone storage box.

[0064] Embodiment 4

[0065] A construction method of a slurry shield stone-removing device also includes a gas pressure balance control process of a slurry shield stone-removing device: determine the balance pressure value according to the buried depth of the stratum through which the slurry shield passes, surface settlement observation, etc., and manually adjust it to the balance pressure value in the shield operation room, and automatically adjust the air intake or exhaust through the air intake and exhaust device above the air cushion cabin 4 to ensure that the mud water pressure in the mud water cabin 2 is near the balance pressure value (the error does not exceed 0.05 bar). The air cushion cabin 4 is connected to the second section screw conveyor 19 cylinder by a pipeline, and the same pressure gas enters the rear of the first section screw conveyor 15 cylinder and the second section screw conveyor 19 cylinder through the air cushion cabin 4. Due to the effect of air pressure, the first air-slurry dividing line 7 and the second air-slurry dividing line 13 are on the same plane. To prevent gas from entering the stone storage box and causing large pressure fluctuations in the air cushion cabin 4 when the first upper gate 16, the second upper gate 20 or the third upper gate 23 is opened, the stone storage box should be filled with gas of the same pressure as the air cushion cabin 4 through the air supply pipeline after the lower gate is closed and before the upper gate is opened.

[0066] Precautions for slurry shield and stone removal device:

[0067] (1) According to the shield tunneling speed and the stone removal speed, the flow rates of the slurry inlet pipe 8 and the slurry discharge pipe 9 are reasonably adjusted to ensure that the first air-slurry dividing line 7 and the second air-slurry dividing line 13 are higher than the slurry inlet pipe 8 in the air cushion cabin 4 (when multiple inlets of the slurry inlet pipe 8 are provided, the first air-slurry dividing line 7 and the second air-slurry dividing line 13 are higher than the lowest inlet of the slurry inlet pipe 8 in the air cushion cabin 4) and lower than the bottom of the second screw conveyor 19;

[0068] (2) During the shield construction process, the pebbles in the lower part of the mud and water tank 2 should be removed as much as possible to avoid the "deposition" of pebbles;

[0069] (3) The volume of the stone storage box should be increased as much as possible under the condition that the shield space allows, and the frequency of opening the upper and lower gates should be reduced;

[0070] (4) When the screw conveyor stops, the slurry shield can carry out slurry feeding and slurry discharge construction and excavation normally, but the pebble deposition height is not allowed to be higher than the slurry discharge pipe 9;

[0071] (5) When the shield tunneling is completed and the segments 10 are assembled, stone extraction can also be carried out;

[0072] (6) The screw conveyor transports pebbles intermittently, so a shaft screw must be used instead of a belt screw.

[0073] The screw conveyor of the present invention is equipped with two sections. The first section of the screw conveyor 15 is arranged obliquely, and the rear end is connected to the front end of the second section of the screw conveyor 19. The front end of the first section of the screw shaft directly extends into the mud and water tank 2. The second section of the screw conveyor 19 is arranged horizontally, and three sets of combined devices consisting of upper and lower gates of the screw conveyor and a stone storage box are designed at the bottom, and the upper and lower gates are closed under normal circumstances. When the mud-water balance shield is excavated normally, the cutter head 1 rotates, and the cutter cuts sand and pebbles, and the cut sand and pebbles enter the mud and water tank 2. The sand and the mud in the slurry inlet pipe 8 are mixed and suspended in the mud, and are discharged by the slurry discharge pump through the slurry discharge pipe 9 to be separated outside the tunnel. The pebbles are directly deposited in the lower part of the mud and water tank 2, and the two sections of the screw conveyor are directly started. The upper gates of the first and third sets of combined devices are opened, and the lower gates are closed. The screw shaft of the first section of the screw conveyor 15 transports the deposited pebbles at the bottom of the mud and water tank 2 to the cylinder of the second section of the screw conveyor 19, and the screw shaft of the second section of the screw conveyor 19 continues to transport backwards. The stone storage box is opened through the upper gate. Before the first set of stone storage boxes is filled with pebbles, the upper gate of the second set of combined devices is opened, the upper gate of the first set of combined devices is closed, the lower gate is opened, and the pebbles in the stone storage box fall onto the running belt 27, and then the lower gate is closed. The pebbles are transported to the tail of the shield trolley via the belt 27, directly fall into the slag car, and finally transported to the working pit via the battery car, and are lifted to the ground by the gantry crane and poured into the slag pit. Before the second set of stone storage boxes is filled with pebbles, the upper gate of the first set of combined devices is opened, the upper gate of the second set of combined devices is closed, the lower gate is opened, and the pebbles in the stone storage box fall onto the running belt 27, and then the lower gate is closed. According to this cycle, the first and second sets of stone storage boxes are opened alternately. When the third set of stone storage boxes is filled with pebbles, the two-section screw conveyor stops, the upper gate of the third set of combined devices is directly closed, the lower gate is opened, and the pebbles in the stone storage box fall onto the running belt 27, and then the lower gate is closed. The screw conveyor is started again to continue to remove stones. During the slurry shield tunneling process, the air cushion cabin 4 and the rear end of the first screw conveyor 15 are connected to the second screw conveyor 19 through a pipeline, and the air pressure balance is maintained to ensure that there are only pebbles and no mud in the output of the screw conveyor.

[0074] Although the preferred embodiments of the present invention have been described, those skilled in the art may make additional changes and modifications to these embodiments once they are aware of the basic creative concepts. Therefore, the appended claims are intended to be interpreted as including the preferred embodiments and all changes and modifications that fall within the scope of the present invention. The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. It should be pointed out that any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A construction method for a slurry shield stone-taking device, characterized in that: The stone storage and retrieval mechanism includes a belt, a first stone storage and retrieval unit, a second stone storage and retrieval unit and a third stone storage and retrieval unit; the first stone storage and retrieval unit includes a first upper gate, a first lower gate and a first stone storage box; the second stone storage and retrieval unit includes a second upper gate, a second lower gate and a second stone storage box; the third stone storage and retrieval unit includes a third upper gate, a third lower gate and a third stone storage box; the belt is arranged below the first stone storage and retrieval unit, the second stone storage and retrieval unit and the third stone storage and retrieval unit; Before the slurry shield tunneling, the first upper gate, the first lower gate, the second upper gate, the second lower gate, the third upper gate and the third lower gate are all in a closed state; When the slurry shield starts to excavate, the first upper gate and the third upper gate are opened, and the first section of the screw conveyor, the second section of the screw conveyor and the belt are started at the same time; The pebbles containing mud in the lower part of the mud and water tank are transported backwards through the screw conveyor shaft. When the pebbles containing mud reach the second air-slurry dividing line, the gas pressure prevents the mud in the pebbles from continuing to move upwards. Steps for accessing stones: The first upper gate and the third upper gate are in the open state, and the pebbles enter the first stone storage box. When the first stone storage box is almost full of pebbles, the second upper gate is opened and the first upper gate is closed; the first lower gate is opened, and the pebbles in the first stone storage box fall onto the running belt and are transported away by the belt; when there are no pebbles in the first stone storage box, the first lower gate is closed; When the second stone storage box is nearly full of pebbles, the first upper gate is opened, the second upper gate is closed, the second lower gate is opened, and the pebbles in the second stone storage box fall onto the running belt and are transported away by the belt; when there are no pebbles in the second stone storage box, the second lower gate is closed; the first stone storage box and the second stone storage box work cyclically and alternately; When the third stone storage box is nearly full of pebbles, the first screw conveyor shaft and the second screw conveyor stop working, the third upper gate and the upper gate corresponding to the stone storage box with pebbles are closed, and then the third lower gate and the lower gate corresponding to the stone storage box with pebbles are opened. When the stone storage box is free of pebbles, the corresponding lower gate is closed; This completes the stone storage and retrieval steps; Then, the stone storage and retrieval step is performed. When the stone storage and retrieval step is performed, the first screw conveyor and the second screw conveyor need to be started at the same time; Under normal circumstances, the stone depositing and withdrawing steps are repeated until the stone depositing and withdrawing needs to be stopped.

2. A slurry shield stone removal device, characterized in that: A construction method for a slurry shield stone-taking device as described in claim 1; It includes a shield cabin, a slurry inlet pipe, a slurry discharge pipe, a screw conveyor and a stone storage and retrieval mechanism; the position where the slurry inlet pipe is connected to the shield cabin is higher than the position where the slurry discharge pipe is connected to the shield cabin; the shield cabin is divided into an air cushion cabin and a mud and water cabin, and the air cushion cabin is formed by injecting gas into the shield cabin by a pneumatic device, and the air cushion cabin is connected to the air inlet and exhaust device; The screw conveyor comprises a first section screw conveyor and a second section screw conveyor. The inlet of the first section screw conveyor is arranged at the bottom of the mud and water tank, and the first section screw conveyor is arranged inclined from bottom to top; the second section screw conveyor is connected to the tail of the first section screw conveyor.

3. A slurry shield stone removal device according to claim 2, characterized in that: The air cushion tank and mud water tank are arranged in the front shield.

4. A slurry shield stone removal device according to claim 2, characterized in that: The air intake and exhaust device is arranged above the air cushion cabin.

5. The slurry shield stone removal device according to claim 2, characterized in that: The rotating shaft of the first section of the screw conveyor is connected to the ring drive.

6. A slurry shield stone removal device according to claim 2, characterized in that: The rotating shaft of the second section of the screw conveyor is connected to the screw machine drive.

7. A slurry shield stone removal device according to claim 2, 5 or 6, characterized in that: The first section screw conveyor and the second section screw conveyor are shaft screw conveyors.

8. The slurry shield stone removal device according to claim 2, characterized in that: The air cushion chamber is connected with the second screw conveyor barrel by a pipeline, and the same pressure gas enters the air cushion chamber, the rear part of the first screw conveyor barrel and the second screw conveyor barrel.

9. A slurry shield stone removal device according to claim 8, characterized in that: The first stone storage box, the second stone storage box and the third stone storage box are connected to the air supply pipeline.

10. A slurry shield stone removal device according to claim 2 or 9, characterized in that: The first stone storage box, the second stone storage box and the third stone storage box are made of transparent material.

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