CN108180019B - A breaker and shield structure machine for muddy water balance shield constructs machine - Google Patents

A breaker and shield structure machine for muddy water balance shield constructs machine Download PDF

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Publication number
CN108180019B
CN108180019B CN201810027519.7A CN201810027519A CN108180019B CN 108180019 B CN108180019 B CN 108180019B CN 201810027519 A CN201810027519 A CN 201810027519A CN 108180019 B CN108180019 B CN 108180019B
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China
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crushing
slurry
area
screening
balance shield
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CN108180019A (en
Inventor
程永亮
彭正阳
唐崇茂
祝爽
任锦江
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China Railway Construction Heavy Industry Group Co Ltd
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China Railway Construction Heavy Industry Group Co Ltd
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    • EFIXED CONSTRUCTIONS
    • E21EARTH OR ROCK DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D9/00Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
    • E21D9/06Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B02CRUSHING, PULVERISING, OR DISINTEGRATING; PREPARATORY TREATMENT OF GRAIN FOR MILLING
    • B02CCRUSHING, PULVERISING, OR DISINTEGRATING IN GENERAL; MILLING GRAIN
    • B02C19/00Other disintegrating devices or methods
    • B02C19/06Jet mills

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  • Engineering & Computer Science (AREA)
  • Mining & Mineral Resources (AREA)
  • Food Science & Technology (AREA)
  • Environmental & Geological Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Life Sciences & Earth Sciences (AREA)
  • Geochemistry & Mineralogy (AREA)
  • Geology (AREA)
  • Excavating Of Shafts Or Tunnels (AREA)

Abstract

The invention provides a crushing device for a slurry balance shield machine and the shield machine. The workload and the workload of the crushing mechanism can be reduced, so that the whole service life of the crushing device is prolonged, the failure rate is reduced, and the crushing efficiency is improved and the maintenance cost is reduced.

Description

A breaker and shield structure machine for muddy water balance shield constructs machine
Technical Field
The invention belongs to the technical field of crushers of slurry balance shield machines, and particularly relates to a crushing device for a slurry balance shield machine and the shield machine.
background
The slurry balance shield machine adopts a slurry conveying mode, thick slurry carrying a large amount of excavation slag materials in the soil cabin is conveyed into a rear slurry pump through a slurry pipeline, and the thick slurry is conveyed to the outside of the tunnel through pressurization of the slurry pump. The excavated slag in the soil cabin contains a large amount of solid particles with large particle diameters, such as large-particle pebbles, besides fine-particle solids and clay, and the maximum particle diameter of the solid particles entering a slurry pump is limited because the pipe diameter of the slurry pipeline is limited and a rear slurry pump has strict requirements on the particle diameter for conveying the solid slag, otherwise equipment is damaged and the pipeline is blocked. Currently, the main solution to the above problem is to provide a large particle stone breaker in the slurry channel before the slurry pump. When the large-particle-size stone blocks in the stratum have large content and high hardness, the working mechanism of the crusher is easy to damage and has short service life.
Disclosure of Invention
The technical problem to be solved by the invention is to overcome the defects of the prior art, and provide the crushing device for the slurry balance shield machine and the shield machine, which can reduce the workload and the workload of the crushing device, thereby prolonging the whole service life of the crushing device, reducing the failure rate, further improving the crushing efficiency and reducing the maintenance cost.
In order to solve the technical problems, the technical scheme provided by the invention is as follows:
a crushing device for a slurry balance shield machine comprises a hydraulic cutting device and a crushing mechanism which are communicated with each other.
The crushing device for the slurry balance shield machine, provided by the invention, adopts the hydraulic cutting device to preliminarily cut solid particles, cracks are formed on the surfaces of the solid particles so as to reduce the crushing difficulty of the solid particles, and then the solid particles are crushed by the crushing mechanism, so that the workload and the working load of the crushing mechanism can be reduced, the integral service life of the crushing device is prolonged, the failure rate is reduced, the crushing efficiency is improved, and the maintenance cost is reduced.
with respect to the above technical solution, further improvements as described below can be made.
According to the crushing device for the slurry balance shield machine, in a preferred embodiment, the hydraulic cutting device comprises a first box body and a hydraulic cutting mechanism arranged at the top of the first box body. Specifically, in a preferred embodiment, the hydraulic cutting mechanism includes a first water jet head that is uniformly disposed on the top of the first tank by a removable mounting deck. The installation apron is connected with detachable mode and is made hydraulic cutting mechanism install and maintain simply convenient, evenly arranges the water jet nozzle at first box top through the installation apron and can carry out many times cutting to the stone, like this, the stone surface will form various kerfs different in size, the degree of depth is different, has destroyed the surperficial integrality of stone, is favorable to crushing mechanism's extrusion breakage to improve breaker's crushing efficiency.
Further, in a preferred embodiment, the hydraulic cutting device is internally provided with a first screening device capable of screening out solid particles exceeding the handling capacity of the mud pipe and the mud pump. The first screening device divides the hydraulic cutting device into a first crushing area and a first slurry discharging area, and the first crushing area is provided with an inlet communicated with the soil cabin. The crushing mechanism comprises a second crushing area and a second slurry discharging area, the first crushing area is communicated with the second crushing area, the first slurry discharging area is communicated with the second slurry discharging area, and the second crushing area is communicated with the second slurry discharging area through a slag discharging hole. The second slurry discharge area is provided with an outlet communicated with the slurry pump.
the invention relates to a crushing device for a slurry balance shield machine, further, a first screening device is adopted to screen solid particles in slurry which exceed the processing capacity of a slurry pipeline and a slurry pump, and two channels of a crushing area and a slurry discharge area are arranged, so that fine-particle stones can be directly discharged out of the crushing device to enter the slurry pump without passing through the crushing area, only part of the solid particles which exceed the processing capacity of the slurry pipeline and the slurry pump need to be crushed, thus further greatly reducing the workload and the working load of a crushing mechanism, avoiding the problems that all slurry passes through the channels from the crushing area and is easy to block to cause equipment damage, and excessive crushing of the small-particle-diameter stones causes energy waste and increases the crushing workload of the crusher to intensify equipment abrasion, further prolonging the whole service life of the crushing device and reducing the failure rate, thereby improving the crushing efficiency and reducing the maintenance cost.
further, in a preferred embodiment, the slag discharge opening is provided with a second screening device capable of screening out solid particles exceeding the handling capacity of the mud pipe and the mud pump. Through the second screening device further arranged at the slag discharging opening, solid particles exceeding the processing capacity of the mud pipeline and the mud pump in the mud can be further ensured to be screened, so that the solid particles exceeding the processing capacity of the mud pipeline and the mud pump are prevented from entering the mud pipeline and the mud pump to cause equipment damage.
In particular, in a preferred embodiment, the first screening device is configured as a plate screen formed by the intersection of longitudinal ribs and transverse drums, the mesh size of the plate screen being arranged to screen out solid particles that exceed the handling capacity of the mud pipe and mud pump. The plate-shaped screen mesh of drum-type can reduce the moving resistance of solid particle on the screen mesh to increase screening effect.
In particular, in another preferred embodiment, the first screening device is configured as a cylindrical screen formed by the intersection of longitudinal and transverse webs, the mesh size of the cylindrical screen being configured to screen out solid particles that exceed the handling capacity of the mud line and mud pump. The transverse size of the cylindrical screen is narrow, so that the overall transverse structure size of the hydraulic breaking device can be reduced, and the hydraulic breaking device is favorable for being installed and arranged in a narrow space in a shield tunneling machine.
In particular, in a preferred embodiment, the crushing mechanism comprises a second bin and a crusher. The second box is divided into a second crushing area and a second slurry discharging area through a partition plate, and the crusher is arranged on the partition plate. The second crushing area is communicated with the second slurry discharging area through a slag discharging opening arranged on the partition plate.
Further, in a preferred embodiment, the crusher is provided with a hydraulic crushing mechanism.
The hydraulic crushing mechanism is added on the crusher, so that the crushing efficiency of the crusher can be further increased.
The shield tunneling machine according to the second aspect of the invention comprises a shell and the crushing device for the slurry balance shield tunneling machine, which is arranged in the shell, is as described above.
Compared with the prior art, the crushing device has the advantages that the workload and the workload of the crushing mechanism can be reduced, so that the whole service life of the crushing device is prolonged, the failure rate is reduced, the crushing efficiency is improved, and the maintenance cost is reduced.
Drawings
The invention will be described in more detail hereinafter on the basis of embodiments and with reference to the accompanying drawings. Wherein:
FIG. 1 is a schematic view showing a crushing apparatus for a slurry balance shield machine according to embodiment 1 of the present invention;
FIG. 2 is a schematic view showing the structure of a hydraulic cutting mechanism according to embodiment 1 of the present invention;
FIG. 3 is a schematic view showing a partial structure of a hydraulic cutting mechanism according to embodiment 1 of the present invention;
FIG. 4 is a schematic view showing the structure of a first screening apparatus according to example 1 of the present invention;
FIG. 5 is a schematic view showing a partial structure of a first screening apparatus according to example 1 of the present invention;
FIG. 6 is a schematic view showing a crushing apparatus for a slurry balance shield machine according to embodiment 2 of the present invention;
FIG. 7 is a schematic view showing the overall construction of a first screening apparatus according to example 2 of the present invention;
FIG. 8 is a schematic view showing a partial structure of a hydraulic cutting mechanism according to embodiment 2 of the present invention;
Fig. 9 schematically shows the overall structure of the hydraulic cutting mechanism of embodiment 2 of the present invention.
In the drawings, like parts are provided with like reference numerals. The figures are not drawn to scale.
Detailed Description
The invention will be further explained in detail with reference to the figures and the embodiments without thereby limiting the scope of protection of the invention.
example 1
fig. 1 schematically shows a crushing apparatus 10 for a slurry balance shield machine according to embodiment 1 of the present invention. Fig. 2 schematically shows the structure of a hydraulic cutting apparatus 1 according to embodiment 1 of the present invention. Fig. 3 schematically shows a partial structure of the hydraulic cutting apparatus 1 of embodiment 1 of the present invention. Fig. 4 schematically shows the structure of the first screening apparatus 3 of embodiment 1 of the present invention. Fig. 5 schematically shows a partial structure of the first screening apparatus 3 of embodiment 1 of the present invention. As shown in fig. 1 to 3, a crushing apparatus 10 for a slurry balance shield machine according to embodiment 1 of the present invention includes a hydraulic cutting apparatus 1 and a crushing mechanism 2 which are communicated with each other. According to the crushing device for the slurry balance shield machine, provided by the embodiment of the invention, the hydraulic cutting device is adopted to preliminarily cut the solid particles, cracks are made on the surfaces of the solid particles so as to reduce the crushing difficulty of the solid particles, and then the crushing mechanism is used for crushing, so that the workload and the workload of the crushing mechanism can be reduced, the integral service life of the crushing device is prolonged, the failure rate is reduced, the crushing efficiency is improved and the maintenance cost is reduced. According to the crushing device 10 for the slurry balance shield machine of the present invention, in a preferred embodiment, the hydraulic cutting device 1 comprises a first box 11 and a hydraulic cutting mechanism 12 arranged on the top of the first box 11. Specifically, in a preferred embodiment, the hydraulic cutting mechanism 12 includes a first water jet head 121, and the first water jet head 121 is uniformly disposed on the top of the first housing 11 through a detachable mounting cover plate 122. The installation apron is connected with detachable mode and is made hydraulic cutting mechanism install and maintain simply convenient, evenly arranges the water jet nozzle at first box top through the installation apron and can carry out many times cutting to the stone, like this, the stone surface will form various kerfs different in size, the degree of depth is different, has destroyed the surperficial integrality of stone, is favorable to crushing mechanism's extrusion breakage to improve breaker's crushing efficiency. Further, the first water jet head 121 is an abrasive water jet head. Preferably, the first water jet nozzles 121 are arranged in a plurality of rows along the central line of the mounting cover plate 122, the arrangement number of the first water jet nozzles 121 in two adjacent rows is different, and the arrangement number of the first water jet nozzles 121 in one row is the same, so that the high-pressure water jet can cover a wider crushing area, and the number of the water jet nozzles can be reduced as much as possible, thereby saving the cost.
Further, as shown in fig. 1, 4 and 5, in a preferred embodiment, the hydraulic cutting device 1 is internally provided with a first screening device 3 capable of screening out solid particles exceeding the handling capacity of the mud pipe and the mud pump. The first screening device 3 divides the hydraulic cutting device 1 into a first crushing area 13 and a first discharge area 14, the first crushing area 13 being provided with an inlet 131 communicating with the soil chamber. The crushing mechanism 2 comprises a second crushing area 21 and a second slurry discharge area 22, the first crushing area 13 is communicated with the second crushing area 21, the first slurry discharge area 14 is communicated with the second slurry discharge area 22, and the second crushing area 21 is communicated with the second slurry discharge area 22 through a slag discharge port 23. The second discharge area 22 is provided with an outlet 24 communicating with a mud pump. The invention relates to a crushing device for a slurry balance shield machine, further, a first screening device is adopted to screen solid particles in slurry which exceed the processing capacity of a slurry pipeline and a slurry pump, and two channels of a crushing area and a slurry discharge area are arranged, so that fine-particle stones can be directly discharged out of the crushing device to enter the slurry pump without passing through the crushing area, only part of the solid particles which exceed the processing capacity of the slurry pipeline and the slurry pump need to be crushed, thus further greatly reducing the workload and the working load of a crushing mechanism, avoiding the problems that all slurry passes through the channels from the crushing area and is easy to block to cause equipment damage, and excessive crushing of the small-particle-diameter stones causes energy waste and increases the crushing workload of the crusher to intensify equipment abrasion, further prolonging the whole service life of the crushing device and reducing the failure rate, thereby improving the crushing efficiency and reducing the maintenance cost. Further, in a preferred embodiment, the slag discharge opening 23 is provided with a second screening device 4 capable of screening out solid particles exceeding the handling capacity of the mud line and the mud pump. Through the second screening device further arranged at the slag discharging opening, solid particles exceeding the processing capacity of the mud pipeline and the mud pump in the mud can be further ensured to be screened, so that the solid particles exceeding the processing capacity of the mud pipeline and the mud pump are prevented from entering the mud pipeline and the mud pump to cause equipment damage.
As shown in fig. 4 and 5, in particular, in a preferred embodiment, the first screening device 3 is constructed as a plate screen 33 formed by intersecting longitudinal ribs 31 and transverse drums 32, the mesh size of the plate screen 33 being set to screen out solid particles exceeding the handling capacity of the mud pipe and mud pump. The plate-shaped screen mesh of drum-type can reduce the moving resistance of solid particle on the screen mesh to increase screening effect. Further, the plate-shaped screen 33 is arranged at an inclination angle downwards towards the slurry discharge direction, and the mounting cover plate 122 is arranged corresponding to the plate-shaped screen 33, that is, the inclination angles of the mounting cover plate 122 and the plate-shaped screen 33 are consistent, so that the distance between the mounting cover plate 122 and the plate-shaped screen 33 is ensured to be consistent. The plate-shaped screen cloth is obliquely arranged, so that the inlet side of the slurry is higher than the outlet side of the slurry, a certain gradient is formed, the movement of stones in the slurry along with the slurry is facilitated, and the slurry discharge efficiency is improved. Preferably, the drum 32 consists of an inner shaft 321 and an outer roller 322, the roller 322 being rotatable around the shaft 321, so as to reduce the resistance to the movement of the stone on the roller, facilitating the movement of the stone. Furthermore, the vibrating device 34 is arranged on the plate-shaped screen 33, and when slurry passes through the vibrating device 34, the screening effect of the first screening device can be greatly enhanced, and material accumulation is reduced.
Returning to fig. 1, further, in a preferred embodiment, a guide plate 5 is arranged below the first screening device 3, the guide plate 5 is arranged with an inclination downwards towards the outlet of the first sludge discharge area 14, and a flushing pipe 6 is arranged on the guide plate 5. The deflector slope is arranged and is towards the slope of mud export, is favorable to the fine particle grit that the bottom precipitated to move towards the export, and the washout pipe that sets up on the deflector can communicate supporting mud and erode the pipeline, further avoids the bottom of the case solid slag to pile up, blocks up the export. Further, the flush tube 6 may employ a continuous flush or intermittent flush pattern.
in particular, as shown in fig. 1, in a preferred embodiment, the crushing means 2 comprises a second box 25 and a crusher 26. The second casing 25 is divided into a second crushing zone 21 and a second pulp discharge zone 22 by a partition 27, and a crusher 26 is disposed on the partition 27. The second crushing zone 21 communicates with the second pulp discharge zone 22 via a slag discharge opening 23 arranged in a partition 27. Further, in a preferred embodiment, a hydraulic breaker mechanism 28 is provided on the breaker 26. The hydraulic crushing mechanism is added on the crusher, so that the crushing efficiency of the crusher can be further increased. The hydraulic crushing mechanism 28 comprises one or a plurality of second water jet nozzles, the spraying direction of the second water jet nozzles faces the slag discharging port 23, and in order to improve the water jet crushing range, the second water jet nozzles adopt swing type water jet nozzles. Preferably, the crusher 26 is a jaw crusher.
Example 2
Fig. 6 schematically shows a crushing apparatus 20 for a slurry balance shield machine according to embodiment 2 of the present invention. Fig. 7 schematically shows the overall structure of the first screening apparatus 3' of example 2 of the present invention. Fig. 8 schematically shows a partial structure of a hydraulic cutting mechanism 12' according to embodiment 2 of the present invention. Fig. 9 schematically shows the overall structure of a hydraulic cutting mechanism 12' of embodiment 2 of the present invention. As shown in fig. 6 to 9, the crushing apparatus 20 for a slurry balance shield machine according to embodiment 2 of the present invention is different from that of embodiment 1 only in that: the first screening device 3 ' is constructed as a cylindrical screen formed by the intersection of longitudinal ribs 31 ' and transverse ribs 32 ', the mesh size of the cylindrical screen being set to screen out solid particles exceeding the handling capacity of the mud pipe and mud pump. The mounting cover 122 ' is configured as a circular arc cover concentric with the cylindrical screen around the upper periphery of the cylindrical screen, and the first water jet nozzles 121 ' of the hydraulic cutting mechanism 12 ' are directed to face the center of the cylindrical screen. The transverse size of the cylindrical screen is narrow, so that the overall transverse structure size of the hydraulic breaking device can be reduced, and the hydraulic breaking device is favorable for being installed and arranged in a narrow space in a shield tunneling machine. And the water jet nozzles can be arranged on the arc-shaped cover plate from different angles, so that the probability that the stone contacts the high-pressure water jet is greatly improved, and a better crushing effect can be achieved by using fewer water jet nozzles. Further, both ends of the cylindrical screen are detachably connected to the first case 11, preferably by flanges, that is, flanges at both ends of the cylindrical screen are connected to flanges at both sides of the first case 11. The detachable connection makes the installation and maintenance of the installation cover plate and the water jet nozzle simple and quick.
The shield tunneling machine according to the second aspect of the present invention comprises a housing and the crushing device 10 or 20 for the slurry balance shield tunneling machine as described above arranged in the housing.
According to the embodiment, the crushing device for the slurry balance shield machine and the shield machine can reduce the workload and the working load of the crushing device, so that the whole service life of the crushing device is prolonged, the failure rate is reduced, the crushing efficiency is improved, and the maintenance cost is reduced.
While the invention has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. It is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.

Claims (6)

1. A crushing device for a slurry balance shield machine is characterized by comprising a hydraulic cutting device and a crushing mechanism which are communicated with each other,
Wherein the hydraulic cutting device comprises a first box body and a hydraulic cutting mechanism arranged at the top of the first box body, the hydraulic cutting mechanism comprises a first water jet nozzle, the first water jet nozzle is uniformly arranged at the top of the first box body through a detachable mounting cover plate,
The hydraulic cutting device is internally provided with a first screening device capable of screening out solid particles exceeding the processing capacity of a slurry pipeline and a slurry pump, the hydraulic cutting device is divided into a first crushing area and a first slurry discharge area below the first crushing area by the first screening device, and the first crushing area is provided with an inlet communicated with the soil cabin;
The crushing mechanism comprises a second box body and a crusher, the second box body is divided into a second crushing area and a second pulp discharging area through a partition plate, and the crusher is arranged on the partition plate;
The first crushing area is communicated with the second crushing area, the first slurry discharging area is communicated with the second slurry discharging area, and the second crushing area is communicated with the second slurry discharging area through a slag discharging port arranged on the partition plate;
and the second slurry discharging area is provided with an outlet communicated with the slurry pump.
2. The crushing device for a slurry balance shield machine according to claim 1, wherein the slag discharge port is provided with a second screening device capable of screening out solid particles exceeding the handling capacity of the slurry pipeline and the slurry pump.
3. A crushing apparatus for a slurry balance shield machine according to claim 1 or 2, wherein the first screening apparatus is configured as a plate-shaped screen formed by intersecting longitudinal ribs and transverse rollers, and the mesh size of the plate-shaped screen is set to screen out solid particles exceeding the handling capacity of a slurry pipeline and a slurry pump.
4. a crushing apparatus for a slurry balance shield machine according to claim 1 or 2, wherein the first screening apparatus is configured as a cylindrical screen formed by intersecting longitudinal ribs and transverse ribs, the mesh size of the cylindrical screen being set to screen out solid particles exceeding the handling capacity of the slurry pipe and slurry pump.
5. The crushing device for the slurry balance shield machine according to claim 1, wherein a hydraulic crushing mechanism is arranged on the crusher.
6. A shield tunneling machine comprising a housing, and the crushing apparatus for a slurry balance shield tunneling machine according to any one of claims 1 to 5 disposed in the housing.
CN201810027519.7A 2018-01-11 2018-01-11 A breaker and shield structure machine for muddy water balance shield constructs machine Active CN108180019B (en)

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CN201810027519.7A CN108180019B (en) 2018-01-11 2018-01-11 A breaker and shield structure machine for muddy water balance shield constructs machine

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Application Number Priority Date Filing Date Title
CN201810027519.7A CN108180019B (en) 2018-01-11 2018-01-11 A breaker and shield structure machine for muddy water balance shield constructs machine

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CN108180019B true CN108180019B (en) 2019-12-10

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Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN113216998A (en) * 2021-06-18 2021-08-06 中铁工程装备集团有限公司 Raw rock abrasive water jet flow construction equipment in tunneling process
CN116771362B (en) * 2023-08-28 2023-10-27 中铁十四局集团装备有限公司 Non-contact slurry pump protection device for shield tunneling machine, and use method and application thereof

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105065007A (en) * 2015-07-17 2015-11-18 中国铁建重工集团有限公司 Mud water circulation and stone crushing system for shield tunneling machine
CN106351666A (en) * 2016-10-31 2017-01-25 中铁工程装备集团有限公司 Slurry balance rectangular shield pipe jacking machine equipment and self flushing system used by slurry balance rectangular shield pipe jacking machine equipment
CN205977226U (en) * 2016-08-10 2017-02-22 海瑞克(广州)隧道设备有限公司 A gravel quarrying case system that it is quick -witted that is used for balanced shield of muddy water to construct
CN107420107A (en) * 2017-05-24 2017-12-01 中国铁建重工集团有限公司 A kind of shield machine for roadway construction

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN105065007A (en) * 2015-07-17 2015-11-18 中国铁建重工集团有限公司 Mud water circulation and stone crushing system for shield tunneling machine
CN205977226U (en) * 2016-08-10 2017-02-22 海瑞克(广州)隧道设备有限公司 A gravel quarrying case system that it is quick -witted that is used for balanced shield of muddy water to construct
CN106351666A (en) * 2016-10-31 2017-01-25 中铁工程装备集团有限公司 Slurry balance rectangular shield pipe jacking machine equipment and self flushing system used by slurry balance rectangular shield pipe jacking machine equipment
CN107420107A (en) * 2017-05-24 2017-12-01 中国铁建重工集团有限公司 A kind of shield machine for roadway construction

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