CN106194205A - Shield duct piece and shield pipeline - Google Patents

Shield duct piece and shield pipeline Download PDF

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Publication number
CN106194205A
CN106194205A CN201610883086.6A CN201610883086A CN106194205A CN 106194205 A CN106194205 A CN 106194205A CN 201610883086 A CN201610883086 A CN 201610883086A CN 106194205 A CN106194205 A CN 106194205A
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CN
China
Prior art keywords
shield
duct piece
shield duct
hole
pipeline
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201610883086.6A
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Chinese (zh)
Inventor
张青富
Original Assignee
张青富
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 张青富 filed Critical 张青富
Priority to CN201610883086.6A priority Critical patent/CN106194205A/en
Publication of CN106194205A publication Critical patent/CN106194205A/en
Pending legal-status Critical Current

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Classifications

    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D11/00Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D11/00Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
    • E21D11/38Waterproofing; Heat insulating; Soundproofing; Electric insulating
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D11/00Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
    • E21D11/38Waterproofing; Heat insulating; Soundproofing; Electric insulating
    • E21D11/385Sealing means positioned between adjacent lining members

Abstract

The invention provides a kind of shield duct piece and shield pipeline, this shield duct piece includes multiple interface arrangment, and this shield pipeline is spliced by this shield duct piece.Multiple interface arrangments of this shield duct piece can effectively prevent the seepage in tunnel of the water in the soil body, shares the part soil pressure acted on connecting bolt simultaneously, thus improves sealing and the tension anti-pressure ability of shield pipeline.

Description

Shield duct piece and shield pipeline
Technical field
The present invention relates to construction project field, in particular to a kind of shield duct piece and shield pipeline.
Background technology
Shield machine is widely used to the civil engineering fields such as tunnel excavation at present.In the work process of shield machine, with The driving of shield machine, need at the section of excavation hoop, shield duct piece to be installed in time.Shield duct piece is the crucial barrier in tunnel, holds Carry on a shoulder pole the load such as earth pressure, groundwater pressure, be the key member directly affecting tunnel water proofing performance simultaneously.
Existing shield duct piece is frequently with strong concrete, in using, typically from the beginning of the section of jurisdiction of bottom, and left and right successively Section of jurisdiction is alternately installed in both sides, uses fastening bolt to fix between section of jurisdiction and section of jurisdiction.It is spliced at existing shield duct piece In shield pipeline, soil mass water partial volume easily from seam crossing seepage, affects the water resistance in tunnel.Meanwhile, soil pressure is to shield pipe The pressure almost all in road acts on fastening bolt, and this reliability connecting shield duct piece also can have a negative impact.
Often there is the defect that anti-seepage effect is poor in the shield pipeline being spliced by above-mentioned shield duct piece, bolt is strong simultaneously Degree causes bigger restriction also to the bearing capacity of shield pipeline.
Summary of the invention
One of the object of the invention is to provide a kind of shield duct piece, it is intended in solution prior art, shield duct piece existence is upper State problem.
The two of the object of the invention are to provide a kind of shield pipeline, it is intended in solution prior art, the existence of shield pipeline is upper State problem.
The present invention is achieved in that
A kind of shield duct piece, shield duct piece is the structure stretched along circular arc by rectangle, and shield duct piece has and relatively sets Putting and be the first side wall and second sidewall of arc, the first side wall is provided with the first Access Division, and the second sidewall is provided with the second clamping Portion, the first Access Division includes multiple first interface arrangment, and the second Access Division includes multiple second interface arrangment, the first Access Division with Second Access Division shape is coincide.
In the preferred embodiment of the present invention, shield duct piece is made up of polypropylene fiber composite.
In the preferred embodiment of the present invention, shield duct piece has the first end and being oppositely arranged and being rectangle Two ends, on shield duct piece, the curved surface near the circular arc center of circle is inwall, and the curved surface being oppositely arranged with inwall is outer wall, and inwall is provided with First link slot and the second link slot, shield duct piece is additionally provided with the first connecting hole and the second connecting hole, and the first connecting hole is by first Link slot penetrates into first end, and second connecting hole one end is connected with the second link slot, and the second connecting hole is passed through by the second link slot Lead to the second end.
In the preferred embodiment of the present invention, shield duct piece inwall is additionally provided with the 3rd link slot and the 4th link slot, shield Structure section of jurisdiction also includes that the 3rd connecting hole and the 4th connecting hole, the 3rd connecting hole are penetrated into the first side wall by the 3rd link slot, the 4th Connecting hole is penetrated into the second sidewall by the 4th link slot.
In the preferred embodiment of the present invention, the edge of inwall is provided with the bonding plane with chamfering structure.
In the preferred embodiment of the present invention, the first side wall, the second sidewall, first end and the second end are provided with sealing Bar.
In the preferred embodiment of the present invention, the first interface arrangment cross section on the first end is trapezoidal.
In the preferred embodiment of the present invention, the first interface arrangment cross section on the first end is circular.
A kind of shield pipeline, shield pipeline is spliced by several axially adjacent shield pipe rings, and shield pipe ring is by several Above-mentioned shield duct piece is spliced, the first Access Division axially adjacent on shield pipeline and the second Access Division clamping, shield pipe Shield duct piece adjacent on road is fixing to be connected.
In the preferred embodiment of the present invention, in shield pipeline, include fire resistant coating.
The invention has the beneficial effects as follows: the shield duct piece that the present invention is obtained by above-mentioned design, during use, shield pipeline axle The first Access Division on two adjacent shield duct pieces and the second Access Division clamping, due to the existence of multiple interface arrangments, the The region of one Access Division and the second Access Division clamping can effectively prevent the seepage in tunnel of the water in the soil body, thus improves shield pipe The sealing in road.It addition, interface arrangment itself can partly resist the deformation that soil pressure causes, thus reduce and act directly on spiral shell Soil pressure on bolt, beneficially shield pipeline tension and the lifting of compressive property.The shield that the present invention is obtained by above-mentioned design Structure section of jurisdiction uses polypropylene fiber composite, and shield duct piece can be made to possess higher rigidity, lighter weight, preferably process Performance and a certain degree of elasticity, it is simple to the processing of shield duct piece, transport, improve the stressing conditions of shield duct piece.
The present invention has good water proofing property, fire line and air-tightness by the shield pipeline that above-mentioned design obtains, and has Higher tension and anti-pressure ability.
Accompanying drawing explanation
In order to be illustrated more clearly that the technical scheme of embodiment of the present invention, will use required in embodiment below Accompanying drawing be briefly described, it will be appreciated that the following drawings illustrate only certain embodiments of the present invention, is therefore not to be seen as It is the restriction to scope, for those of ordinary skill in the art, on the premise of not paying creative work, it is also possible to root Other relevant accompanying drawings are obtained according to these accompanying drawings.
Fig. 1 is the shield duct piece structural representation that the embodiment of the present invention one provides;
Fig. 2 is the partial enlarged drawing in A portion in Fig. 1;
Fig. 3 is the connection diagram of the shield duct piece that the embodiment of the present invention one provides;
Fig. 4 is the structural representation of the shield duct piece that the embodiment of the present invention two provides;
Fig. 5 is the structural representation of the shield pipeline that the embodiment of the present invention three provides.
Icon: 100-shield duct piece;110-the first side wall;112-the second sidewall;130-first end;132-the second end Portion;150-inwall;152-outer wall;160-bonding plane;170-sealing strip;1102-the first Access Division;1102a-the first card access node Structure;1122-the second Access Division;1122a-the second interface arrangment;1501-the first link slot;1502-the first connecting hole;1503- Two link slots;1504-the second connecting hole;1505-the 3rd link slot;1506-the 3rd connecting hole;1507-the 4th link slot; 1508-the 4th connecting hole;162-seal groove;180-connecting bolt;200-shield pipeline;210-shield pipe ring.
Detailed description of the invention
For making the purpose of embodiment of the present invention, technical scheme and advantage clearer, implement below in conjunction with the present invention Accompanying drawing in mode, is clearly and completely described the technical scheme in embodiment of the present invention, it is clear that described reality The mode of executing is a part of embodiment of the present invention rather than whole embodiments.Based on the embodiment in the present invention, ability The every other embodiment that territory those of ordinary skill is obtained under not making creative work premise, broadly falls into the present invention The scope of protection.Therefore, detailed description to the embodiments of the present invention provided in the accompanying drawings is not intended to limit and wants below Seek the scope of the present invention of protection, but be merely representative of the selected embodiment of the present invention.Based on the embodiment in the present invention, The every other embodiment that those of ordinary skill in the art are obtained under not making creative work premise, broadly falls into this The scope of invention protection.
In describing the invention, it is to be understood that the indicating position such as term " in " " on " " interior " or position relationship Term is based on orientation shown in the drawings or position relationship, or the orientation usually put when this invention product uses or position Relation, is for only for ease of the description present invention and simplifies description rather than instruction or imply that the equipment of indication or element must have Have specific orientation, with specific azimuth configuration and operation, be therefore not considered as limiting the invention.Additionally, term " the One ", " second ", " the 3rd ", " the 4th " etc. only describe with distinguishing, and it is not intended that instruction or hint relative importance.
In the present invention, unless otherwise clearly defined and limited, term " is connected ", the term such as " connection " should do broad sense reason Solve, connect for example, it may be fixing, it is also possible to be to removably connect, or integral;Can be to be joined directly together, it is also possible to pass through Intermediary is indirectly connected to, and can be connection or the interaction relationship of two elements of two element internals.For this area Those of ordinary skill for, above-mentioned term concrete meaning in the present invention can be understood as the case may be.
Below in conjunction with the accompanying drawings, some embodiments of the present invention are elaborated.In the case of not conflicting, following Feature in embodiment and embodiment can be mutually combined.
Embodiment one.
Present embodiments providing a kind of shield duct piece 100, refer to Fig. 1, this shield duct piece 100 is along one by a rectangle Section circular arc stretches and obtains, and the material of shield duct piece 100 is polypropylene fiber composite.Shield duct piece 100 includes the first side wall 110, the second sidewall 112, first end 130, the second end 132, inwall 150, outer wall 152, bonding plane 160 and sealing strip 170. The first side wall 110 is the arc-plane on shield duct piece 100, the second sidewall 112 be on shield duct piece 100 with the first side wall 110 another arc-planes being oppositely arranged.First end 130 is the rectangle plane on the first side wall 110, the second end 132 For another rectangle plane being oppositely arranged with first end 130 on the first side wall 110.Inwall 150 is close on shield duct piece 100 The curved surface of side, the circular arc center of circle, outer wall 152 is another curved surface being oppositely arranged with inwall 150.
The first side wall 110 is provided with the first Access Division 1102, and the first Access Division 1102 includes three along inwall 150 place circumference Radial direction the first interface arrangment 1102a arranged side by side.First interface arrangment 1102a cross section on first end 130 is ladder Shape, trapezoidal in shorter base be placed on the first side wall 110, trapezoidal in longer base away from the first side wall 110.Second sidewall 112 are provided with the second Access Division 1122, and the second Access Division 1122 includes that three radial direction along inwall 150 place circumference are arranged side by side The cross sectional shape of the second interface arrangment 1122a, the second interface arrangment 1122a and the cross sectional shape kiss of the first interface arrangment 1102a Close, and the distribution of the second interface arrangment 1122a and the first interface arrangment 1102a one_to_one corresponding.
Referring to Fig. 1 and Fig. 2, on inwall 150, the side near the first side wall 110 is provided with three curl along inwall 150 First link slot 1501 of distribution.Shield duct piece 100 also includes the first connecting hole 1502, one end of the first connecting hole 1502 and the One link slot 1501 connects, and the first connecting hole 1502 is through to the first side wall 110 by the first link slot 1501.Lean on inwall 150 The side of nearly second sidewall 112 is provided with the second link slot 1503 that three curl along inwall 150 are distributed, and shield duct piece 100 is also Including the second connecting hole 1504, one end of the second connecting hole 1504 connects with the second link slot 1503, the second connecting hole 1504 by Second link slot 1503 is through to first end 130.On inwall 150, the side near first end 130 is provided with two along inwall 3rd link slot 1505 of the straight line distribution of 150, shield duct piece 100 also includes the 3rd connecting hole 1506, the 3rd connecting hole One end of 1506 connects with the 3rd link slot 1505, and the 3rd connecting hole 1506 is through to first end by the 3rd link slot 1505 130.On inwall 150, the side near the second end 132 is provided with the 4th link slot that two straight lines along inwall 150 are distributed 1507, shield duct piece 100 also includes the 4th connecting hole 1508, and one end of the 4th connecting hole 1508 is with the 4th link slot 1507 even Logical, the 4th connecting hole 1508 is through to the second end 132 by the 4th link slot 1507.
Bonding plane 160 is located at four limit edges of inwall 150.Bonding plane 160 is in a certain angle with inwall 150 oblique Face.
Sealing strip 170 is sheathed on shield duct piece 100, sealing strip 170 respectively with the first side wall 110, first end 130, Two sidewalls 112 and the second end 132 connect.
Referring to Fig. 1 and Fig. 3, in using, two shield duct pieces 100 are spliced together, one of them shield duct piece 100 Second interface arrangment 1122a is tied together with the first interface arrangment 1102a of another shield duct piece 100, two shield pipes Sheet 100 connects by connecting bolt 180 is fixing.Under the effect of the fastening force of connecting bolt 180 offer, two shield duct pieces Sealing strip 170 on 100 fits tightly.Bonding plane 160 on two shield duct pieces 100 surrounds seal groove 162, seal groove 162 For filling gasket coating.
In the present embodiment, by fitting tightly of the sealing strip 170 on two shield duct pieces 100, one-level antiseepage can be realized; The clamping of multiple second interface arrangment 1122a and the first interface arrangment 1102a realizes two grades of antiseepages, and therefore the present embodiment provides Shield duct piece 100 has good waterproof effect.
Embodiment two.
Present embodiments provide a kind of shield duct piece 100, its structure and material and shield duct piece 100 base in embodiment one This is identical.
Refer to Fig. 4, the shield duct piece 100 in the present embodiment and the main distinction of the shield duct piece 100 in embodiment one Being, in the shield duct piece 100 that the present embodiment provides, the first interface arrangment 1102a and the second interface arrangment 1122a is at the first end Cross section in portion 130 is circular.
The first interface arrangment 1102a in the shield duct piece 100 that the present embodiment provides and the work of the second interface arrangment 1122a With identical with the effect of the first interface arrangment 1102a and the second interface arrangment 1122a in embodiment one.When two shield duct pieces 100 in when axially splicing of shield duct piece 100, the first interface arrangment 1102a of one of them shield duct piece 100 and another shield Second interface arrangment 1122a clamping of structure section of jurisdiction 100, thus reach the purpose of antiseepage.
In sum, having the beneficial effects that of the shield duct piece 100 that the embodiment of the present invention one and embodiment two provide, arrange Multiple first interface arrangment 1102a and the second interface arrangment 1122a, improve the waterproof effect of shield pipeline 200;First card access node Structure 1102a and the second interface arrangment 1122a itself will share the pulling force acted on connecting bolt 180, improves shield pipeline 200 Reliability.
The beneficial effect of the shield duct piece 100 that the embodiment of the present invention one and embodiment two provide also resides in, shield duct piece 100 Using polypropylene fiber composite, this material can ensure that shield duct piece 100 has higher rigidity.In the first Access Division 1102 and second the structure of Access Division 1122 complex in the case of, use polypropylene fiber composite can reduce shield pipe The difficulty of processing of sheet 100, it is ensured that shield duct piece 100 splicing convenience, alleviate the weight of shield duct piece 100, it is simple to transport and Processing.
Embodiment three.
Referring to Fig. 1 and Fig. 5, present embodiments provide a kind of shield pipeline 200, this shield pipeline 200 includes several Axially adjacent shield pipe ring 210, shield pipe ring 210 is spliced by several shield duct piece 100 hoops, shield duct piece 100 Material is polypropylene fiber composite.The first Access Division 1102 and the second Access Division that shield pipeline 200 axis direction is adjacent 1122 clampings.Shield duct piece 100 adjacent on shield pipeline 200 axis and circumferencial direction is all achieved a fixed connection by bolt. Fire resistant coating is included in shield pipeline 200.
The operation principle of shield pipeline 200 is, in use, the moisture in the soil body may be to for shield pipeline 200 Shield pipeline 200 internal leak.Owing to shield duct piece 100 is provided with multiple first interface arrangment 1102a and the second interface arrangment 1122a, is equipped with sealing strip 170 simultaneously, therefore can stop the moisture in the soil body seepage, sealing strip in shield pipeline 200 170 air-tightness that can also improve shield pipeline 200.All it is filled with in seal groove 162 (referring to Fig. 3) on shield pipeline 200 Gasket coating.The inwall of shield pipeline 200 is provided with fire resistant coating, strengthens the fire resistance property of shield pipeline 200.
Shield pipeline 200 in use, will persistently be subject to the pressure P from the soil body.The existence of soil pressure P makes shield Structure pipeline 200 is deformed, thus produces pulling force on connecting bolt 180.Shield duct piece 100 arranges multiple first clamping Structure 1102a and the second interface arrangment 1122a, can reduce the deformation quantity size that under External Force Acting, shield pipeline 200 produces, make work The falling part being used on connecting bolt 180 is dispersed to the structure of the first interface arrangment 1102a and the second interface arrangment 1122a originally Body, thus reduce the power on connecting bolt 180 that acts on, improve the reliability of shield pipeline 200.
Having the beneficial effects that, by arranging multiple first card access node of the shield pipeline 200 that the embodiment of the present invention three provides Structure 1102a and the second interface arrangment 1122a, improves the waterproof effect of shield pipeline 200;Shield duct piece 100 is provided with sealing strip 170, enhance the air-tightness of shield pipeline 200;First interface arrangment 1102a and the second interface arrangment 1122a itself will share Act on the pulling force on connecting bolt 180, improve the reliability of shield pipeline 200, in shield pipeline 200, have fire resistant coating, increase The fire protecting performance of strong shield pipeline 200.
The beneficial effect of the shield pipeline 200 that the embodiment of the present invention three provides also resides in: this shield pipeline 200 is by shield pipe Sheet 100 is spliced.Shield duct piece 100 material is PP composite material, and polypropylene fiber composite can ensure shield While structure pipeline 200 ring stiffness, improve the processing characteristics of shield duct piece 100, alleviate the weight of shield duct piece 100, it is simple to fortune Defeated and processing.In addition, PP composite material has limited elasticity, and therefore, this shield pipeline 200 can produce in the soil body Raw a small amount of deformation, in a certain degree, reaches the state of " soil pipe unification ", thus by the part suffered by shield pipeline 200 Pressure transfers to the soil body.
In sum, the beneficial effects of the present invention is: due to multiple first interface arrangment 1102a and the second interface arrangment The existence of 1122a, the region of the first Access Division 1102 and the second Access Division 1122 clamping can effectively prevent the water in the soil body to tunnel Seepage in road, thus improve the sealing of shield pipeline 200.It addition, the first Access Division 1102 and the second Access Division 1122 itself Can bearing part soil pressure, thus reduce act directly on the soil pressure on connecting bolt 180, beneficially shield pipeline 200 tensions and the lifting of compressive property.
It should be noted that the first Access Division 1102 and the second Access Division 1122 are for promoting the waterproof of shield pipeline 200 Performance, reduces simultaneously and acts on the pulling force on connecting bolt 180, the first interface arrangment comprised in the first Access Division 1102 The quantity of the second interface arrangment 1122a comprised in the quantity of 1102a and the second Access Division 1122 can take according to practical situation Positive integer in addition to one;The cross section of the first interface arrangment 1102a and the second interface arrangment 1122a also should not necessarily be limited by above enforcement Be given in example is trapezoidal and semicircle, and can be other any situations;In the embodiment given by the present invention, polypropylene is fine Ring stiffness is higher, be prone to processing and the demand being easily assembled, shield duct piece 100 and shield pipeline for meeting for dimension composite The material of 200 can modify according to actual needs, is not limited solely to polypropylene fiber composite.
The foregoing is only the preferred embodiment of the present invention, be not limited to the present invention, for this area For technical staff, the present invention can have various modifications and variations.All within the spirit and principles in the present invention, that is made is any Amendment, equivalent, improvement etc., should be included within the scope of the present invention.

Claims (10)

1. a shield duct piece, it is characterised in that described shield duct piece is the structure stretched along circular arc by rectangle, described shield Structure section of jurisdiction has the first side wall and the second sidewall being oppositely arranged and being arc, and described the first side wall is provided with the first Access Division, Described second sidewall is provided with the second Access Division, and described first Access Division includes multiple first interface arrangment, described second Access Division Including multiple second interface arrangments, described first Access Division coincide with described second Access Division shape.
Shield duct piece the most according to claim 1, it is characterised in that described shield duct piece is by polypropylene fiber composite Make.
Shield duct piece the most according to claim 2, it is characterised in that described shield duct piece has and is oppositely arranged and is square The first end of shape and the second end, on described shield duct piece, the curved surface near the described circular arc center of circle is inwall, with described inwall The curved surface being oppositely arranged is outer wall;
Described inwall is provided with the first link slot and the second link slot, and described shield duct piece is additionally provided with the first connecting hole and second and connects Hole, described first connecting hole one end is connected with described first link slot, and described first connecting hole is through by described first link slot To described first end, described second connecting hole one end is connected with described second link slot, and described second connecting hole is by described Two link slots penetrate into described the second end.
Shield duct piece the most according to claim 3, it is characterised in that described inwall is additionally provided with the 3rd link slot and the 4th even Access slot, described shield duct piece also includes the 3rd connecting hole and the 4th connecting hole, and described 3rd connecting hole one end is with the described 3rd even Access slot connects, and described 3rd connecting hole is penetrated into described the first side wall, described 4th connecting hole one end by described 3rd link slot Connecting with described 4th link slot, described 4th connecting hole is penetrated into described second sidewall by described 4th link slot.
Shield duct piece the most according to claim 4, it is characterised in that the edge of described inwall is provided with has chamfering structure Bonding plane.
Shield duct piece the most according to claim 5, it is characterised in that described the first side wall, described second sidewall, described One end and described the second end are provided with sealing strip.
Shield duct piece the most according to claim 6, it is characterised in that described first interface arrangment is on described first end Cross section be trapezoidal.
Shield duct piece the most according to claim 6, it is characterised in that described first interface arrangment is on described first end Cross section be circular.
9. a shield pipeline, it is characterised in that described shield pipeline is spliced by several axially adjacent shield pipe rings, institute State shield pipe ring to be spliced by shield duct piece hoop described in any one in several claim 1-8, on described shield pipeline Axially adjacent described first Access Division and described second Access Division clamping, described shield duct piece adjacent on described shield pipeline Fixing connection.
Shield pipeline the most according to claim 9, it is characterised in that include fire resistant coating in described shield pipeline.
CN201610883086.6A 2016-10-10 2016-10-10 Shield duct piece and shield pipeline Pending CN106194205A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201610883086.6A CN106194205A (en) 2016-10-10 2016-10-10 Shield duct piece and shield pipeline

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Application Number Priority Date Filing Date Title
CN201610883086.6A CN106194205A (en) 2016-10-10 2016-10-10 Shield duct piece and shield pipeline

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Publication Number Publication Date
CN106194205A true CN106194205A (en) 2016-12-07

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CN110130942A (en) * 2019-06-04 2019-08-16 江苏迅拓机械有限公司 A kind of tunnel steel tube piece mounting structure

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Publication number Priority date Publication date Assignee Title
CN110130942A (en) * 2019-06-04 2019-08-16 江苏迅拓机械有限公司 A kind of tunnel steel tube piece mounting structure

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Application publication date: 20161207