CN109441459B - Earth pressure balance type shield split starting side unearthing construction method - Google Patents
Earth pressure balance type shield split starting side unearthing construction method Download PDFInfo
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- CN109441459B CN109441459B CN201811391499.8A CN201811391499A CN109441459B CN 109441459 B CN109441459 B CN 109441459B CN 201811391499 A CN201811391499 A CN 201811391499A CN 109441459 B CN109441459 B CN 109441459B
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- 238000010276 construction Methods 0.000 title claims abstract description 50
- 239000002689 soil Substances 0.000 claims abstract description 47
- 238000000034 method Methods 0.000 claims abstract description 16
- 229910000831 Steel Inorganic materials 0.000 claims description 31
- 239000010959 steel Substances 0.000 claims description 31
- 230000005641 tunneling Effects 0.000 claims description 17
- 238000009434 installation Methods 0.000 claims description 4
- 230000008569 process Effects 0.000 claims description 4
- 230000007547 defect Effects 0.000 abstract description 3
- 230000006872 improvement Effects 0.000 description 9
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 238000013459 approach Methods 0.000 description 2
- 230000003137 locomotive effect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 239000003673 groundwater Substances 0.000 description 1
- 230000000977 initiatory effect Effects 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000002372 labelling Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
- 239000011150 reinforced concrete Substances 0.000 description 1
- 230000003014 reinforcing effect Effects 0.000 description 1
- 239000002893 slag Substances 0.000 description 1
- 238000012549 training Methods 0.000 description 1
- 238000009423 ventilation Methods 0.000 description 1
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/06—Making by using a driving shield, i.e. advanced by pushing means bearing against the already placed lining
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- E—FIXED CONSTRUCTIONS
- E21—EARTH OR ROCK DRILLING; MINING
- E21D—SHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
- E21D9/00—Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
- E21D9/12—Devices for removing or hauling away excavated material or spoil; Working or loading platforms
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- Environmental & Geological Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Geochemistry & Mineralogy (AREA)
- Geology (AREA)
- Lining And Supports For Tunnels (AREA)
- Excavating Of Shafts Or Tunnels (AREA)
Abstract
A construction method for earth pressure balance type shield split starting side unearthing is characterized in that an earth unloading opening of a temporary bridge is connected with a chute, and an unearthing opening of the chute is positioned on either side of the left side or the right side of the temporary bridge; before the shield machine tunnels, the soil hopper is firstly hung below the position of the soil outlet of the chute, then the shield machine starts to tunnel through the tunnel door, the muck is conveyed to the soil unloading opening of the temporary bridge frame through the screw conveyor and the belt conveyor, and then the muck falls into the soil hopper along the chute. The method is suitable for unearthed construction of split starting stages of all short shaft earth pressure balance shields, has low requirement on operation space, does not need to increase the length of the shield well, saves engineering cost, does not need to use a winch for unearthed construction, avoids the defect of unearthed construction of the winch, and has the characteristics of economy, safety and high efficiency.
Description
Technical Field
The invention relates to the field of shield tunnel construction, in particular to an earth pressure balance type shield split starting side unearthing construction method which is suitable for unearthing construction of all short shaft earth pressure balance shield split starting stages.
Background
The earth pressure balance shield split starting unearthing operation is a high-risk construction link which is easy to cause accidents in shield construction, and at present, the earth pressure shield split starting unearthing construction in China mainly adopts a mode that a right rear winch is matched with an earth bucket or an electric locomotive transportation mode to carry out unearthing construction.
The prior art can not meet the requirements of safe, economic and efficient construction, and mainly needs a certain operation space for unearthing right behind and needs to increase the length of a shield well so as to increase the engineering investment cost; due to the limitation of the operation space, the direct rear unearthing can not be transported by a gantry crane, but only a winch unearthing mode can be adopted, the winch unearthing has higher potential safety hazard, particularly under the condition that the initial section is an uphill section, accidents such as vehicle sliding collision, steel wire rope fracture and the like are very easy to happen if the earth hopper braking is not well controlled, and meanwhile, the direct rear unearthing has the defects of low speed, low efficiency and long construction period when the winch unearthing is adopted.
Disclosure of Invention
The invention aims to solve the technical problems and provides an earth pressure balance type shield split starting side unearthing construction method which is suitable for unearthing construction at the split starting stage of the earth pressure balance shield of all short vertical shafts, has low requirement on operation space, does not need to increase the length of the shield shaft, saves engineering cost, does not need to use a winch for unearthing, avoids the defect of unearthing of the winch, and has the characteristics of economy, safety and high efficiency.
In order to realize the purpose of the invention, the adopted technical scheme is as follows: the construction method comprises the steps that a temporary bridge is arranged in a shield starting well, a chute is connected to an earth unloading opening of the temporary bridge, the chute is arranged obliquely downwards, and the earth outlet of the chute is located on either side of the left side or the right side of the temporary bridge; before tunneling, the soil bucket is firstly lifted to a position below a soil outlet of the chute, then the shield tunneling machine starts to tunnel through a tunnel door, and the muck is conveyed to a soil unloading opening of the temporary bridge frame through a screw conveyor and a belt conveyor and then falls into the soil bucket along the chute; when the soil bucket needs to be subjected to soil lifting operation, the chute is disassembled or pulled up, the soil bucket is lifted and moved out, then the empty soil bucket is lifted and moved down to the position below the original chute soil outlet, the chute is reinstalled or put down, and soil is reinstalled; after the shield tunneling machine finishes one ring pipe piece tunneling work, the chute is disassembled or pulled up, side pipe pieces and track lifting operation is carried out, after the pipe pieces and the track lifting operation are finished, the chute is re-assembled or put down, and side unearthing operation is continued after the pipe pieces are assembled.
As a further improvement of the invention, the chute is formed by connecting a front chute and a rear chute, wherein the front chute and the rear chute both comprise a bottom wall and side walls fixed on the left side and the right side of the bottom wall, the front end part of the front chute is fixedly connected with the soil unloading opening, the tail end part of the rear chute is provided with a soil outlet, and the rear chute is used as a target for implementing the actions of disassembling and assembling or pulling up and putting down.
As a further improvement of the invention, the bottom surfaces of the bottom walls of the front and rear chutes are respectively welded with square steel arranged along the length direction of the bottom wall, the bottom surfaces of the two side walls of the front and rear chutes are respectively welded with square steel arranged along the width direction of the side walls, and the square steel on the bottom wall is welded with the square steel on the side walls.
As a further improvement of the invention, the square steel on the bottom wall and the square steel on the side wall are both 30mm square steel.
As a further improvement of the invention, the front section chute is 3 meters long and 1.2 meters wide, the rear section chute is 2.2 meters long and 1.21 meters wide, and the bottom walls and the left and right side walls of the front and rear sections of chutes are made of 3mm thick steel plates.
As a further improvement of the invention, the front end of the chute at the rear section is connected with the bottom of the tail end of the chute at the front section.
As a further improvement of the invention, the tail ends of the two side walls of the front section chute and the front ends of the two side walls of the rear section chute are respectively provided with bolt holes which are convenient for chute installation and disassembly.
As a further improvement of the invention, the temporary bridge is provided with a fulcrum in the middle of the supporting leg on the side corresponding to the chute, a hook device is arranged on the top of the side, a chain block is hung on the hook device, the chute is supported and installed through the fulcrum, and the chain block is connected to the chute.
As a further improvement of the invention, the slope of the chute is 30-45%.
As a further improvement of the invention, in the forward propelling process of the shield tunneling machine, the temporary bridge and the chute propel the same distance along with the temporary bridge and the chute, and the soil hopper is kept still.
The invention has the beneficial effects that:
the method has strong universality and high safety. The method is suitable for all soil pressure balance split initiations, particularly for the construction working condition of the short shaft of the water delivery tunnel, fully utilizes the working spaces on the left side and the right side by the mode that the chute unearths on either side of the temporary bridge frame, can solve the problem of narrow space limitation, enables unearthed work to be hoisted by a gantry crane, avoids the problem of large risk caused by unearthed work of a winch, and reduces the safety risk of the work in the shield initial well.
Secondly, high efficiency. The construction is carried out by using the method, so that the effective and efficient unearthing operation of the screw conveyor is ensured, and the labor cost for cleaning the slag in the well is reduced; the method can utilize the gantry crane to pull the large soil bucket for loading soil in the unearthing process, and compared with the unearthing mode of a winch to pull the small soil bucket, the method greatly accelerates the shield tunneling unearthing operation efficiency and shortens the shield starting period.
And thirdly, the construction quality is guaranteed. By adopting the method for construction, the unearthing operation period is greatly shortened, the initial tunneling time of the shield machine is shortened, and the shield machine can rapidly tunnel through a tunnel portal and an end reinforcing section soil body, so that ground settlement and groundwater loss are reduced; in addition, the construction environment in the well is improved, and the control of the posture and the line shape of the shield tunneling machine is ensured.
Fourthly, the economic benefit is high. When the method is adopted for construction, the required equipment is simple, and the transportation is simple and convenient; the method has low requirement on the operation space, can effectively adapt to the construction working condition of the short vertical shaft, does not need to increase the length of the vertical shaft, and reduces the investment on the vertical shaft; the method is simple and feasible in process, and can save certain labor cost and a large amount of construction period cost.
Drawings
FIG. 1 is a schematic view of the chute structure;
FIG. 2 is a schematic view of a lateral unearthing structure of the chute;
description of the labeling: 1-temporary bridge frame, 11-soil unloading opening, 12-fulcrum, 13-lifting hook device, 14-chain block, 2-chute, 21-front section chute, 211-bottom wall, 212-side wall, 213-square steel, 214-square steel, 215-bolt hole, 22-rear section chute, 221-bottom wall, 222-side wall, 223-square steel, 224-square steel, 225-bolt hole and 226-soil outlet.
Detailed Description
The invention is further explained below with reference to the drawings and examples.
The shield construction of a certain water delivery tunnel project in Shenzhen, Guangdong province adopts the earth pressure balance type shield split starting side earth-discharging construction method. The project shield launching well is only used for shield machine downhole launching and material transportation wells, and backfill treatment is needed after the project is completed; the design length of the well is 30m (the actual operation space is 27.6m), the longitudinal slope of the section of the line is 1%, a reinforced concrete symmetrical beam is arranged in the middle of the working well, and the shield construction operation space is narrow. The components of a whole that can function independently is required to be adopted for the construction of the earth pressure balance shield, but because the space is narrow and small, the conventional electric locomotive unearthing mode cannot be adopted, certain risk exists again if the unearthing mode of a winch is utilized, the efficiency is low, the construction period is long, and the handling of the pipe piece is influenced.
The construction method for the split starting side unearthing of the earth pressure balanced type shield comprises the following construction steps:
(1) construction preparation: the method comprises the following steps of peripheral environment investigation, site leveling, hardening of an approach road and a construction site, construction of facilities such as construction water, electricity and ventilation, inspection and acceptance of approach by using machines and tools and materials, construction drawing examination, technical return, safety education and training of operators, return and the like.
(2) Installing an embedded part and erecting an operation platform: the method comprises the steps of installing pre-buried steel plates on a bottom plate in advance according to the position of a tunnel door, the size of a shield starting frame and the structural size of a reaction frame before the construction of a bottom plate of the shield well, installing a connecting bridge, a temporary bridge frame 1 and a construction platform by I-shaped steel behind the reaction frame after the bottom plate is completed, and paving a track.
(3) Assembling and debugging the shield machine: the shield mechanism accessories are accepted in the field, the temporary bridge, the connecting bridge and the screw machine are hoisted and lowered into the well and are translated to the rear of the starting frame, and then the shield body is respectively hoisted and lowered into the well for assembly and connection; secondly, performing the work of assembling machine hoisting, screw machine installation and connection of the connecting bridge and the temporary bridge frame 1; and finally, connecting the ground trolley with an oil pipe, drawing the circuit to the underground and connecting in a shield body, and debugging the shield machine after completion.
(4) Manufacturing the ground lateral unearthing chute 2: as shown in fig. 1, during the assembling and debugging of the shield machine, a front chute 21 with a length of 3m and a width of 1.2m and a rear chute 22 with a length of 2.2m and a width of 1.21m are processed in a ground workshop, the tail end of the rear chute 22 is provided with a soil outlet 226, each of the front and rear chutes 21 and 22 comprises a bottom wall 211 and a bottom wall 221 and side walls 212 and 222 fixed on the left side and the right side of the bottom wall 211 and 221, and the bottom walls 211 and 221 and the left and right side walls 212 and 222 of the front and rear chutes 21 and 22 are made of steel plates with a thickness of 3 mm; the bottom surfaces of the bottom walls 211 and 221 of the front and rear chutes 21 and 22 are respectively welded with 30mm square steels 213 and 223 arranged along the length direction of the bottom walls, the bottom surfaces of the two side walls 212 and 222 of the front and rear chutes 21 and 22 are respectively welded with 30mm square steels 214 and 224 arranged along the width direction of the side walls, the square steels 213 and 223 on the bottom walls 211 and 221 are welded with the square steels 214 and 224 on the side walls 212 and 222, and the structural strength of the front and rear chutes 21 and 22 can be enhanced through the arrangement of the square steels 213, 214, 223 and 224; a22 mm bolt hole 215 and 225 is reserved in each 10cm part of the 20cm parts of the tail ends of the two side walls 212 of the front section chute 21 and the 20cm parts of the front ends of the two side walls 222 of the rear section chute 22, so that the front section chute 21 and the rear section chute 22 can be conveniently mounted and dismounted.
(5) The lateral unearthing chute 2 is installed: as shown in fig. 2, a chute 2 is connected to the soil discharge opening 11 of the temporary bridge frame 1, the chute 2 is arranged obliquely downward, and the soil discharge opening 226 of the chute 2 is located on either left side or right side of the temporary bridge frame 1. Considering the dead weight of the chute 2 and the impact and weight of falling muck, a double-spliced 5# channel steel is welded in the middle of a supporting leg on one side, where the chute 2 is installed, on the temporary bridge frame 1 to serve as a middle fulcrum 12 of the chute, and the chute 2 is supported and installed through the fulcrum 12; two hook devices 13 are welded on the top of the same side of the temporary bridge frame 1, and a chain block 14 is hung on the hook devices 13. The front end part of the front section chute 21 and the soil unloading opening 11 of the temporary bridge frame 1 are connected and welded and fixed through a steel plate, the chain block 14 is connected to the soil outlet 226 of the rear section chute 22, the front section chute 21 and the rear section chute 22 are connected and fixed through reserved bolt holes 215 and 225, and during connection, the front end of the rear section chute 22 is connected to the bottom of the tail end of the front section chute 21, and the rear section chute 22 can be pulled upwards by the chain block 14. After the chute 2 is installed, the slope of the chute 2 is guaranteed to be 30-45% so as to guarantee the flowability of the muck.
(6) The shield tunneling side unearthing comprises the steps of utilizing chain blocks 14 on two sides of a rear section chute 22 to pull up the rear section chute 22 before tunneling, then hoisting an earth bucket 3 (the earth bucket is transported to 36.5m × 1.5.5 m × 2.5.5 m in a normal tunnel of a shield) to the earth outlet side of a temporary bridge frame 1 through a gantry crane and translating to the position of an earth outlet 226 of the rear section chute 22 for placing, then lowering the rear section chute 22, then starting tunnel breaking and tunneling through a shield machine, transporting muck in an earth bin of the shield machine to an earth discharge port 11 of the temporary bridge frame 1 through a screw conveyor and a belt conveyor, then dropping the muck into the earth bucket 3 along the chute 2, when the shield machine advances by about 30cm (shield stroke of one bucket), moving the chute 2 and the temporary bridge frame 1 forward by 30cm, keeping the earth bucket 3 still, finally, pulling up the rear section chute 22 after the earth bucket 3 is filled with the soil, hoisting the earth bucket 3 out of the rear section chute 22 through the gantry crane, then moving the empty chute 3 to the position of the rear section chute and repeatedly hoisting the earth outlet 226.
(7) And (3) after the shield finishes a ring of duct pieces (1.5m) tunneling work according to the step (6), detaching the rear section chute 22, carrying out lateral duct piece and track lifting operation, reinstalling the rear section chute 22 after the duct piece and track lifting operation is finished, and continuing to carry out lateral unearthing operation according to the step (6) after the duct piece assembly is finished.
The soil pressure balance shield split starting side unearthing effectively overcomes the space limitation of the short shaft of the water delivery tunnel, and saves the economic cost. And the lateral unearthing effectively avoids the greater safety risk of unearthing of the winch, and simultaneously, the lateral unearthing also greatly accelerates the shield propelling speed and shortens the construction period.
In summary, the effect of the usage test of the present invention after multiple usage tests proves that the present invention can achieve the expected purpose, and the practical value is needless to say. The above-mentioned embodiments are only for convenience of illustration and not intended to limit the invention in any way, and those skilled in the art will be able to make equivalents of the features of the invention without departing from the technical scope of the invention.
Claims (9)
1. A construction method for earth pressure balance type shield split starting side unearthing is characterized in that: a temporary bridge is arranged in the shield starting well, a chute is connected to the soil unloading opening of the temporary bridge, the chute is arranged obliquely downwards, and the soil outlet of the chute is positioned on either side of the left side and the right side of the temporary bridge; before tunneling, the soil bucket is firstly lifted to a position below a soil outlet of the chute, then the shield tunneling machine starts to tunnel through a tunnel door, and the muck is conveyed to a soil unloading opening of the temporary bridge frame through a screw conveyor and a belt conveyor and then falls into the soil bucket along the chute; when the soil bucket needs to be subjected to soil lifting operation, the chute is disassembled or pulled up, the soil bucket is lifted and moved out, then the empty soil bucket is lifted and moved down to the position below the original chute soil outlet, the chute is reinstalled or put down, and soil is reinstalled; after the shield tunneling machine finishes one ring pipe piece tunneling work, the chute is disassembled or pulled up, side pipe pieces and a track are lifted, after the pipe pieces and the track are lifted, the chute is re-assembled or put down, and after the pipe pieces are assembled, side unearthing operation is continued; the hoisting of the soil bucket, the pipe piece and the track is carried out by adopting a gantry crane; the chute is formed by connecting a front section chute and a rear section chute, the front section chute and the rear section chute both comprise bottom walls and side walls fixed on the left side and the right side of the bottom walls, the front end part of the front section chute is fixedly connected with a soil unloading opening, the tail end part of the rear section chute is provided with a soil outlet, and the rear section chute is detached and installed or pulled up and put down.
2. The earth pressure balance type shield split starting side unearthing construction method according to claim 1, characterized in that: the bottom surface of the bottom wall of the front section of chute and the bottom surface of the bottom wall of the rear section of chute are respectively welded with square steel arranged along the length direction of the bottom wall, the bottom surfaces of the two side walls of the front section of chute and the rear section of chute are respectively welded with square steel arranged along the width direction of the side walls, and the square steel on the bottom wall is welded with the square steel on the side walls.
3. The earth pressure balance type shield split starting side unearthing construction method according to claim 2, characterized in that: the square steel on the bottom wall and the square steel on the side wall are both 30mm square steel.
4. The earth pressure balance type shield split starting side unearthing construction method according to claim 1, characterized in that: the front section chute is 3 meters long and 1.2 meters wide, the rear section chute is 2.2 meters long and 1.21 meters wide, and the bottom walls and the left and right side walls of the front and rear sections of chutes are made of 3mm thick steel plates.
5. The earth pressure balance type shield split starting side unearthing construction method according to claim 1, characterized in that: the front end of the rear chute is connected with the bottom of the tail end of the front chute.
6. The earth pressure balance type shield split starting side unearthing construction method according to claim 1, characterized in that: bolt holes convenient for chute installation and disassembly are formed in the tail ends of the two side walls of the front section chute and the front ends of the two side walls of the rear section chute.
7. The earth pressure balance type shield split starting side unearthing construction method according to claim 1, characterized in that: the temporary bridge frame is equipped with the fulcrum at the landing leg middle part that corresponds one side with the chute to set up hook assembly at this side top, hook assembly has hung chain block, the chute passes through the fulcrum supports the installation, chain block connects on the chute, the slope of chute is 30 ~ 45.
8. The earth pressure balance type shield split starting side unearthing construction method according to claim 1, characterized in that: the slope of chute is 30 ~ 45.
9. The earth pressure balance type shield split starting side unearthing construction method according to claim 1, characterized in that: in the forward propelling process of the shield tunneling machine, the temporary bridge and the chute propel the same distance along with the temporary bridge and the chute, and the soil hopper is kept still.
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| CN201811391499.8A CN109441459B (en) | 2018-11-21 | 2018-11-21 | Earth pressure balance type shield split starting side unearthing construction method |
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| CN201811391499.8A CN109441459B (en) | 2018-11-21 | 2018-11-21 | Earth pressure balance type shield split starting side unearthing construction method |
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| CN109441459B true CN109441459B (en) | 2020-07-28 |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110219661A (en) * | 2019-07-12 | 2019-09-10 | 中铁工程装备集团有限公司 | Applied to minimum starting well separate launching corollary apparatus and originate construction method |
| CN110510367A (en) * | 2019-09-16 | 2019-11-29 | 粤水电轨道交通建设有限公司 | A kind of active belt regulating device |
| CN111255466A (en) * | 2020-01-20 | 2020-06-09 | 中铁十二局集团第二工程有限公司 | Construction method for single shaft starting by changing tunnel into shield by mining method |
| CN112682060B (en) * | 2020-12-11 | 2023-01-06 | 中铁工程服务有限公司 | Novel double-slag-hole chute and construction method thereof |
| CN114215541A (en) * | 2021-12-21 | 2022-03-22 | 中铁六局集团有限公司 | Shield constructs components of a whole that can function independently and starts with interim platform truck frock |
| CN114412497B (en) * | 2022-01-13 | 2024-06-07 | 华侨大学 | Construction method for quick soil discharging and feeding of normal tunneling of shield of short-interval vertical shaft |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| JP4716885B2 (en) * | 2006-01-30 | 2011-07-06 | ジャパントンネルシステムズ株式会社 | Parent-child shield machine |
| CN201605005U (en) * | 2010-02-08 | 2010-10-13 | 宝山钢铁股份有限公司 | Recovery device of fallen mine materials with hopper |
| CN202508557U (en) * | 2012-04-05 | 2012-10-31 | 中铁十局集团济南铁路工程有限公司 | Shield single-well overall originating belt machine auxiliary device |
| CN102616520B (en) * | 2012-04-05 | 2014-04-16 | 中铁十局集团济南铁路工程有限公司 | Auxiliary device for shield single-well integral starting belt conveyor |
| CN204299187U (en) * | 2014-12-15 | 2015-04-29 | 中建七局建筑装饰工程有限公司 | A kind of detachable concrete casting device |
| CN107269291A (en) * | 2017-07-25 | 2017-10-20 | 北京建工土木工程有限公司 | Material and dregs transportation system in shield separate launching tunnel |
| CN207724794U (en) * | 2017-12-13 | 2018-08-14 | 六盘水康博木塑科技有限公司 | A kind of charging lifting device |
| CN108071403B (en) * | 2018-01-29 | 2023-03-14 | 重庆建工集团股份有限公司 | Split starting equipment for tunnel excavation |
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