CN107575239A - A kind of portable shield launching device for small space - Google Patents
A kind of portable shield launching device for small space Download PDFInfo
- Publication number
- CN107575239A CN107575239A CN201710962665.4A CN201710962665A CN107575239A CN 107575239 A CN107575239 A CN 107575239A CN 201710962665 A CN201710962665 A CN 201710962665A CN 107575239 A CN107575239 A CN 107575239A
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- reaction frame
- small space
- launching device
- side girder
- stand
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- 229910000831 Steel Inorganic materials 0.000 claims description 13
- 239000010959 steel Substances 0.000 claims description 13
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 claims description 6
- 238000010276 construction Methods 0.000 abstract description 13
- 239000000463 material Substances 0.000 abstract description 8
- 230000001141 propulsive effect Effects 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 4
- 238000009434 installation Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 239000002689 soil Substances 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000005553 drilling Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000003137 locomotive effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005484 gravity Effects 0.000 description 1
- 235000021182 hors d'oeuvre Nutrition 0.000 description 1
- 239000003999 initiator Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 230000003319 supportive effect Effects 0.000 description 1
- 230000005641 tunneling Effects 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
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- Lining And Supports For Tunnels (AREA)
Abstract
A kind of portable shield launching device for small space, including originating stand, reaction frame, horizontal support and reference rings, stand is originated to be fixed on starting well bottom plate, the both sides for originating stand are respectively fixed with side girder, an at least row positioning screw hole is respectively provided with the side girder of both sides, reaction frame is connected with arbitrary positioning screw hole on the side girder of both sides respectively by bolt, reaction frame is set vertically to be removably attached on the side girder of both sides, special-shaped ring flat-plate is fixed with reaction frame, reference rings are located at the front of reaction frame with leaving spacing, horizontal support ring is distributed between reaction frame and reference rings, and the both ends of horizontal support ring are separately fixed in special-shaped ring flat-plate and reference rings, make reaction frame, an entirety is formed between horizontal support and reference rings.The present invention saves construction cost and duration, and can be shield material and the enough working spaces of offer that are unearthed in small space without the negative endless tube piece of assembly.
Description
Technical field
The present invention relates to a kind of device of shield method tunnel construction technical field, more particularly to one kind to be used for narrow and small sky
Between middle shield launching portable shield launching device.
Background technology
At present, shield method occupies in the constructing tunnel fields such as subway tunnel, diversion, water supply tunnel, electric power tunnel
Leading position, it is widely used.Depending on originating place size, shield can use entirety or separate launching, but no matter adopt
Originated with which kind of mode, be required to a kind of device that enough counter-forces can be provided for shield machine driving, shield launching device is shield
The prerequisite originated.
At present, the widely used fixed reaction frame of shield-tunneling construction adds the combination of assembled negative endless tube piece to be filled as shield launching
Put.Reaction frame is fixed, and shield machine often pushes ahead a cell distance, i.e., an assembled ring bears ring between reaction frame and shield machine
Section of jurisdiction, the rear end face of negative endless tube piece group are close to reaction frame, and front end face is close to the jack of shield machine, by negative endless tube piece group and instead
Power frame provides enough propulsive thrust for shield machine, pushes ahead shield machine.So circulation, ensure smoothly originating for shield machine.
After shield machine is tunneled to certain distance, shield shell meets shield thrust with stratum frictional force, and shield launching device no longer transmits shield
After structure thrust, then shield launching device is removed, that is, remove reaction frame and negative endless tube piece group.
This shield launching device has some limitations：(1) need to make, hang in and install a number of negative ring
Section of jurisdiction, and terminate to need to remove negative endless tube piece in construction and hang out, cause the problem of construction cost is big, long in time limit；(2)
The assembly of negative endless tube piece has certain requirement to place size, though the assembly of negative endless tube piece, field can be met in narrow and small place
The limitation on ground causes the construction of negative endless tube piece to have certain difficulty, and efficiency of construction high degree reduces；(3) in narrow and small place
In, because negative endless tube piece occupies great space, shield material, the handling and transport of the earthwork are have impact on, because space limits, only
The earthwork can be transported using hoist engine, each earthwork transportation amount is 1-2 side, and handling is extremely inefficient often up to 17 times.
The content of the invention
In order to solve the above-mentioned technical problem, the invention provides a kind of portable shield launching dress for small space
Put, it has certain flexibility without assembled negative endless tube piece, saving construction cost and duration, can in small space
For handling, the conevying efficiency of shield material and the be unearthed enough working spaces of offer, raising shield material and the earthwork.
In order to realize the purpose of the present invention, used technical scheme is：A kind of portable shield for small space
Initiator device, including originate stand, reaction frame, horizontal support and reference rings, it is characterised in that：The stand that originates is fixed on the beginning
Send out on the plate of shaft bottom, the both sides for originating stand are respectively fixed with along the side girder for originating the setting of stand direction, the side of both sides
Be respectively provided with longeron at least one row along side girder direction set positioning screw hole, the reaction frame by bolt respectively with both sides
Side girder on arbitrary positioning screw hole connection, reaction frame is vertically removably attached on the side girder of both sides, it is described
Special-shaped ring flat-plate is fixed with reaction frame, the reference rings are located at the front of reaction frame, the horizontal support ring with leaving spacing
It is distributed between reaction frame and reference rings, and the both ends of horizontal support ring are separately fixed in special-shaped ring flat-plate and reference rings, are made anti-
An entirety is formed between power frame, horizontal support and reference rings.
As a further improvement on the present invention, in addition to diagonal brace, one end of the diagonal brace are fixed on reaction frame, the other end
It is removably attached to by bolt on side girder.
As a further improvement on the present invention, the diagonal brace and the angle originated between stand are 38 degree.
As a further improvement on the present invention, the reference rings are annular, are welded by upper and lower two parts assembly.
As a further improvement on the present invention, the bottom of the reference rings is provided with orientation traveling wheel, the orientation walking
Pulley can be close on the shield tail internal valve of shield machine.
As a further improvement on the present invention, the starting well bottom plate is provided with built-in fitting, described to originate stand and side is indulged
Any one of beam or both is welded on built-in fitting.
As a further improvement on the present invention, the built-in fitting includes connecting plate and is located at least one set of connecting plate bottom
Anchor rib, every group of anchor rib include two anchor ribs, the anchor rib in J-shaped, every group of two anchor ribs and connecting plate it
Between be in π shape structures.
As a further improvement on the present invention, in addition to saddle and jack, the saddle are removably solid by bolt
It is scheduled on the side girder at reaction frame rear, the jack is between saddle and reaction frame, and the jack is using saddle as branch
Support point, thrust is on reaction frame.
As a further improvement on the present invention, the reaction frame is rectangular frame, and four edges of the reaction frame are equal
Provided with oblique pedestal, oblique pedestal forms triangular structure with adjacent both sides.
As a further improvement on the present invention, the horizontal support uses seamless steel pipe, and the both ends of seamless steel pipe are welded with
Flange, the horizontal support are separately fixed on special-shaped ring flat-plate and reference rings by the flange at both ends.
Beneficial effects of the present invention are：The present invention is set by setting side girder in the both sides for originating stand in side girder
An at least row positioning screw hole is put, reaction frame is removably attached to by bolt on side girder, by tightening, quick-release bolt,
Reaction frame is set arbitrarily to change fixed position on side girder.When carrying out shield launching, reaction frame, horizontal support and benchmark
Ring forms a generally shield machine and provides propulsive thrust, and the jack of shield machine is acted in reference rings, and shield machine is pushed away using counter
Power moves forward, and reaction frame needs to be moved forward along side girder according to the forward movement of shield machine, by reaction frame forward
Running transform fixed position, horizontal support and reference rings move so that after shield machine moves forward, the jack of shield machine
It still is able to act in reference rings, is moved forward so as to continue with propulsive thrust, so circulation, until completes shield launching.It is logical
The present invention is crossed, without the negative endless tube piece of assembly, the process such as eliminates the manufacture of negative endless tube piece, hang in, be assembled, removing and hanging out, from
And construction cost is reduced, save the duration；In the present invention, the space shared by negative endless tube piece, reaction frame, horizontal support and base are eliminated
Lead ring can move with the movement of shield, in small space, with the movement of reaction frame, horizontal support and reference rings,
Certain working space can be provided for shield-tunneling construction at reaction frame rear, be effectively utilized limited space, so as to
Possess dregs bucket and hang native operating condition, it is possible to increase shield material and earthwork transportation efficiency；The present invention can reduce security risk point,
Due to without assembled negative endless tube piece, negative endless tube piece lifting risk can be reduced, further, since space is sufficient, without using hoist engine
Carry out hanging soil, avoid hoist engine use from colliding the event of hurting sb.'s feelings.
Brief description of the drawings
Fig. 1 is overall structure front view of the present invention；
Fig. 2 is overall structure side view of the present invention；
Fig. 3 is reaction frame of the present invention and originates stand schematic diagram；
Fig. 4 originates stand top view to be of the present invention；
Fig. 5 is special-shaped ring flat-plate schematic diagram of the present invention；
Fig. 6 is reference rings schematic diagram of the present invention；
Description of symbols：1- originates stand, 11- side girders, 12- positioning screw holes, 2- reaction frames, the oblique pedestals of 21-, 22- abnormity
Ring flat-plate, 3- diagonal braces, 4- horizontal supports, 41- flanges, 5- reference rings, 51- orientations traveling wheel, 6- starting wells bottom plate, 61- are pre-buried
Part, 62- connecting plates, 63- anchor ribs, 7- shield machines.
Embodiment
With reference to specific embodiment and accompanying drawing, the invention will be further described.
Guangzhou electric power tunnel civil engineering, originate well construction headroom size 23*8.4m, deep 17.5m, the diameter of shield machine 7
4.36m, shield body length 7.7m, weigh about 200 tons, begun using a kind of portable shield for small space of the present invention
Transmitting apparatus carries out shield launching, and specific implementation is as follows：
As shown in figures 1 to 6, a kind of portable shield launching device for small space, including originate stand 1, reaction frame
2nd, diagonal brace 3, horizontal support 4 and reference rings 5.
Originate stand 1 and use steel structural form, be assemblied to form by two sections that length is respectively 9m and 4m, be mainly used in bearing
The frictional force when gravity of shield machine 7 and propulsion.Originate stand 1 both sides be respectively and fixedly provided with along originate the direction of stand 1 setting
Side girder 11, side girder 11 use steel box structure, and side girder 11 is provided with the positioning spiral shell that two row are set along the direction of side girder 11
Hole 12.
Because shield machine 7 weighs about 200 tons, so enough rigidity, intensity must be had by originating stand 1.In starting well
It is embedded with 12 pieces of built-in fittings 61 on bottom plate 6, built-in fitting 61 is made of Steel material, including connecting plate 62 and is located at the bottom of connecting plate 62
Six groups of anchor ribs 63 in portion, each side three groups, every group of anchor rib 63 includes two anchor ribs 63, anchor rib 63 in J-shaped,
It is in π shape structures between every group of two anchor ribs 63 and connecting plate 62.
Originate stand 1 and side girder 11 is fixed on starting well bottom plate 6, and effectively welded with built-in fitting 61, by pre-buried
Part 61 provides enough anchor forces and resistance horizontal shear force, and movable type shield launching device is overall backward when avoiding shield driving
Move and float.
Originate stand 1 and side girder 11 and gone into the well before shield machine 7 goes into the well assembling and location and installation and reinforced, originate stand 1
Connection between each component, and the connection originated between stand 1 and side girder 11 use M24, and intensity is 8.8 grade high-strength spiral shells
Bolt, screw aperture are all higher than bolt 2mm.
Reaction frame 2 is rectangular frame, is made up of the underbeam of the upper beam at top, the column of both sides and bottom, the four of reaction frame 2
Individual edge is equipped with oblique pedestal 21, and oblique pedestal 21 forms triangular structure with adjacent both sides, using the stability of triangle,
The support effect of reaction frame 2 can be improved.
Reaction frame 2 is connected with arbitrary positioning screw hole 12 on the side girder 11 of both sides respectively by bolt, reaction frame 2 is hung down
Directly it is removably attached on the side girder 11 of both sides, the fixed position of reaction frame 2 is entered according to the propulsion position of shield machine 7
Row changes.
To ensure the uniform force of reaction frame 2, ensure reaction frame 2 end face is smooth and globality, fixed on reaction frame 2 different
Shape ring flat-plate 22, the thrust of transmission is first acted on special-shaped ring flat-plate 22, then be transferred on reaction frame 2.
Reaction frame 2 is accurately positioned before installing, it is necessary to ask and originate stand 1, and is computed checking, to ensure the vertical of reaction frame 2
When pouring into a mould portal after being removed to position in nullring concrete section of jurisdiction, meet the physical dimension and connection request and the stabilization of support of portal
Property.
2 each component of reaction frame is hung in starting well with gantry and docked with side girder 11 after installation on ground is good, reaction frame 2
Between each component connecting bolt use M24, the connecting bolt between reaction frame 2 and side girder 11 uses M30, intensity 10.9S
Level steel construction high-strength bolt, screw aperture is all higher than bolt 2mm.
In order to ensure that shield machine 7 originates posture, when installing reaction frame 2 and originating stand 1, it need to ensure that originating stand 1 determines
Within ± 10mm, height variation is controlled within ± 5mm for position installation left-right deviation control, the control of upper lower deviation ± 10mm it
It is interior, to control the installation accuracy of reaction frame 2.Originate the angle ＜ of the vertical direction of the horizontal axis of stand 1 and reaction frame 2 ±
2 ‰, shield attitude and design axis vertical trend deviation ＜ 2 ‰, horizontal departure ＜ ± 3 ‰.
Diagonal brace 3 is that reaction frame 2 provides back seat counter-force, ensures that shield machine 7 tunnels forward required thrust, diagonal brace 3 uses H types
Steel I40b Three kinds of hors d'oeuvres is formed, and twice are set at the rear portion of reaction frame 2.Diagonal brace 3 and the angle originated between stand 1 are 38 degree.Diagonal brace 3
One end is fixed on reaction frame 2, and the other end is removably attached on side girder 11 by bolt, the fixed position of diagonal brace 3 with
The change of reaction frame 2 and change.
Reference rings 5 are located at the front of reaction frame 2 with leaving spacing, are annular, by the assembled welding of upper and lower two half part
Into, two bottom sides are provided with orientation traveling wheel 51, and orientation traveling wheel 51 can be close on the shield tail internal valve of shield machine 7,
It is easy to reference rings 5 to walk and play a supportive role on shield tail internal valve.
When reference rings 5 are installed, first it will install and move to shaft bottom, and by the latter half under upper lower half two parts straddle truck
Fixed in shield tail with channel-section steel；Then two hangers are welded on the point of shield tail 1 position, 11 point positions, will with two 2T chain block
The top half of reference rings 5 is sling and welded with the latter half assembly.Reference rings 5 use two half parts composition up and down, are easy to transport
Defeated and assembling.
Power transmission connection component on the basis of horizontal support 4 between ring 5 and reaction frame 2, horizontal support 4 use length for
1.84m, φ 219mm, thick 2cm seamless steel pipe, the both ends of seamless steel pipe are welded with flange 41.Horizontal support 4 totally 14, ring
It is evenly distributed between reaction frame 2 and reference rings 5, and horizontal support 4 is separately fixed at special-shaped ring flat-plate by the flange 41 at both ends
22 and reference rings 5 on, make between reaction frame 2, horizontal support 4 and reference rings 5 formed an entirety.
During shield launching, the jack of shield machine 7 is acted in reference rings 5, passes through portable shield launching device
Propulsive thrust promote shield machine 7 move forward.The thrust that reference rings 5 are subject to is transferred to special-shaped ring flat-plate 22 by horizontal support 4, passes therewith
Reaction frame 2 is handed to, side girder 11 is then transferred to by diagonal brace 3 and originated on stand 1, is finally transferred to starting well bottom plate 6.Indulge side
Beam 11 is steel box structure, big with the contact area of starting well bottom plate 6, power can be converted into area load by load, weaken and pass
It is handed to the power of starting well bottom plate 6.
In shield tunneling process, reaction frame 2 needs to be moved forward along side girder 11 according to the reach of shield machine 7, can
Applying external force in several ways moves forward reaction frame 2.In the present embodiment, pass through saddle and jack (not indicated in figure)
Move forward reaction frame 2, saddle is removably attached to by bolt on the side girder 11 at the rear of reaction frame 2, jack position
Between saddle and reaction frame 2, jack using saddle as the strong point, thrust on reaction frame 2, so as to by reaction frame 2 to
It is preceding promotion one unit, then change saddle fixed position, by saddle to reach one unit, then fix, again by
Jack promotes reaction frame 2, and so on, realizes the movement of reaction frame 2.
In the Guangzhou electric power tunnel civil engineering, starting well length 23m, only meet shield machine 7, connecting bridge and 8# chassis pendulum
Put.At the initial stage that originates, shield machine 7 enters building enclosure diaphram wall, and driving thrust reaches 500t, and cylinder jack acts on base
On lead ring 5, enough propulsive thrust is provided for the driving of shield machine 7.
When carrying out shield launching, shield machine 7 often moves forward 1m, portable shield launching device and then mobile 1m, specific behaviour
Make as follows：First, the jack of shield machine 7 is acted in reference rings 5, and shield machine 7 is by propulsive thrust drilling depth 1m；2nd, shield is shunk
The jack cylinder of machine 7；3rd, reaction frame 2, diagonal brace 3 are released and originates the bolt between stand 1；4th, elongation acts on reaction frame 2
On jack, reaction frame 2 is moved forward 1m, diagonal brace 3, horizontal support 4 and reference rings 5 move forward 1m, reference rings 5 and shield machine therewith
7 jack is mobile in place effectively to top；5th, second leg drilling depth.So circulation, until completing shield launching.In above-mentioned step
In rapid, the surface soldered bracket of shield machine 7 is effectively fixed with originating stand 1, prevents shield machine 7 from retreating.The movement of reaction frame 2 is completed
Afterwards, saddle and jack are dismantled, both are moved forward fixed after 1m, in order to the movement of reaction frame 2 next time.
Portable shield launching device stops movement when being moved to openings position, bolt fixes reaction frame 2, is shield driving
Fixed counter-force is provided.Now, by the movement of portable shield launching device, 8m effective operations space is provided for active well,
Dregs flows into dregs bucket by chute, hangs soil using 25t straddle trucks side, often by 8# chassis Belt Conveying to chassis afterbody
The side of dipper capacity 6,41 ring dregs amount handlings of completion.After shield machine 7 enters soil body 15m, starting well meets electric locomotive with transporting
Dolly working space, material and dregs are transported using electric locomotive.The transport of materials efficiency such as dregs and section of jurisdiction is improved, reduces construction
Security risk point, ensure that shield machine 7 tunnels at least 4 rings/day, shorten the shield launching time.
In summary, such as specification and diagramatic content actual sample is made and through test is used for multiple times in the present invention, from making
Seen with the effect of test, the provable present invention can reach its desired purpose, and practical value is unquestionable.It is provided above
Embodiment only illustrates the present invention for convenient, not makees any formal limitation, any affiliated technology neck to the present invention
Have usually intellectual in domain, if in the range of not departing from the present invention and carrying technical characteristic, utilize disclosed technology
The equivalent embodiment for locally changing or modifying made by content, and without departing from the technical feature content of the present invention, still fall within
In the range of the technology of the present invention feature.
Claims (10)
1. a kind of portable shield launching device for small space, including originate stand, reaction frame, horizontal support and benchmark
Ring, it is characterised in that：The stand that originates is fixed on starting well bottom plate, the both sides for originating stand be respectively fixed with along
The side girder of stand direction setting is originated, the positioning that at least one row are set along side girder direction is respectively provided with the side girder of both sides
Screw, the reaction frame are connected with arbitrary positioning screw hole on the side girder of both sides respectively by bolt, make reaction frame vertically
It is removably attached on the side girder of both sides, special-shaped ring flat-plate is fixed with the reaction frame, the reference rings are with leaving spacing
The front of reaction frame is located at, the horizontal support ring is distributed between reaction frame and reference rings, and the both ends of horizontal support ring
It is separately fixed in special-shaped ring flat-plate and reference rings, makes to form an entirety between reaction frame, horizontal support and reference rings.
A kind of 2. portable shield launching device for small space according to claim 1, it is characterised in that：Also wrap
Diagonal brace is included, one end of the diagonal brace is fixed on reaction frame, and the other end is removably attached on side girder by bolt.
A kind of 3. portable shield launching device for small space according to claim 2, it is characterised in that：It is described
Diagonal brace and the angle originated between stand are 38 degree.
A kind of 4. portable shield launching device for small space according to claim 1, it is characterised in that：It is described
Reference rings are annular, are welded by upper and lower two parts assembly.
A kind of 5. portable shield launching device for small space according to claim 1, it is characterised in that：It is described
The bottom of reference rings is provided with orientation traveling wheel, and the orientation traveling wheel can be close on the shield tail internal valve of shield machine.
A kind of 6. portable shield launching device for small space according to claim 1, it is characterised in that：It is described
Starting well bottom plate is provided with built-in fitting, and described any one of stand and side girder or both of originating is welded on built-in fitting.
A kind of 7. portable shield launching device for small space according to claim 6, it is characterised in that：It is described
Built-in fitting includes connecting plate and is located at least one set of anchor rib of connecting plate bottom, and every group of anchor rib includes two anchor ribs, institute
It is in J-shaped to state anchor rib, and two of every group are in π shape structures between anchor rib and connecting plate.
A kind of 8. portable shield launching device for small space according to claim 1, it is characterised in that：Also wrap
Saddle and jack are included, the saddle is removably attached to by bolt on the side girder at reaction frame rear, the jack
Between saddle and reaction frame, the jack is using saddle as the strong point, and thrust is on reaction frame.
A kind of 9. portable shield launching device for small space according to claim 1, it is characterised in that：It is described
Reaction frame is rectangular frame, and four edges of the reaction frame are equipped with oblique pedestal, and oblique pedestal forms three with adjacent both sides
Angular structure.
A kind of 10. portable shield launching device for small space according to claim 1, it is characterised in that：Institute
State horizontal support and use seamless steel pipe, the both ends of seamless steel pipe are welded with flange, the flange point that the horizontal support passes through both ends
It is not fixed in special-shaped ring flat-plate and reference rings.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710962665.4A CN107575239B (en) | 2017-10-16 | 2017-10-16 | Movable shield launching device for narrow space |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710962665.4A CN107575239B (en) | 2017-10-16 | 2017-10-16 | Movable shield launching device for narrow space |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107575239A true CN107575239A (en) | 2018-01-12 |
| CN107575239B CN107575239B (en) | 2024-04-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710962665.4A Active CN107575239B (en) | 2017-10-16 | 2017-10-16 | Movable shield launching device for narrow space |
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| Country | Link |
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| CN (1) | CN107575239B (en) |
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| CN110566216A (en) * | 2019-10-09 | 2019-12-13 | 北京市市政四建设工程有限责任公司 | steel ring structure for shield launching |
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| CN112554893A (en) * | 2020-11-18 | 2021-03-26 | 中交一公局厦门工程有限公司 | Shield constructs quick-witted steel sleeve and starts supporting sealing system |
| CN113236267A (en) * | 2021-06-25 | 2021-08-10 | 中铁工程装备集团技术服务有限公司 | Shield starting counterforce device and using method thereof |
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