CN208687143U - A kind of large-bore plastics pressure pipe, plastics reinforced pipe and plastics duct piece forming die - Google Patents
A kind of large-bore plastics pressure pipe, plastics reinforced pipe and plastics duct piece forming die Download PDFInfo
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- CN208687143U CN208687143U CN201821390868.7U CN201821390868U CN208687143U CN 208687143 U CN208687143 U CN 208687143U CN 201821390868 U CN201821390868 U CN 201821390868U CN 208687143 U CN208687143 U CN 208687143U
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Abstract
The utility model relates to a kind of large-bore plastics pressure pipe, plastics reinforced pipe and plastics duct piece forming dies, the plastic pressure pipe includes several sections of jurisdiction, all sections of jurisdiction can successively be spliced to form plastic pressure pipe tube body, the outer wall of each section of jurisdiction is equipped with several transverse bars along several axial vertical muscle and circumferentially, sweat soldering between the two neighboring section of jurisdiction.With a kind of plastic pressure pipe described in the utility model, each section of jurisdiction outer wall is designed with muscle in length and breadth, enhance the structural strength of each section of jurisdiction, so that ensure that the structural strength of entire tube body after successively sweat soldering forms tube body in all sections of jurisdiction, the plastic pressure pipe avoids the monolithic extruded molding problems of major diameter pressure pipe, its uniform wall thickness, concentricity is good, and resistance to pressure is strong, ring stiffness is high, and yields is high.
Description
Technical field
The utility model relates to pipeline manufacturing field, especially a kind of large-bore plastics pressure pipe and plastics reinforced pipe.
Background technique
Existing plastic pressure pipe generally uses extrusion moulding to produce, and the maximum gauge for producing plastic pressure pipe at present is
2m, such as plastic pressure pipe according to extrusion moulding production heavy caliber (diameter is greater than 2m), are easy to produce pressure thickness of pipe wall and reach
Less than require, eccentric, concentricity is bad, there are bubbles the defects of, cause quality undesirable, yield rate is low, due to squeezing out
The method of forming be it is integrally formed, the production mould size of large-bore plastics pressure pipe is big, requires equipment performance high, and equipment is expensive,
Energy consumption is high, and yield rate is low, and operating difficulties is at high cost.
Therefore, to solve the above-mentioned problems, a kind of assembly type modeling that China Patent Publication No. CN108278421A is disclosed
Expect pressure pipe, it is now desired to enhance the structural strength of assembly type plastic pressure pipe.
Utility model content
The goal of the invention of the utility model is: needing to enhance assembly type plastic pressure pipe for of the existing technology
The problem of structural strength, provides a kind of large-bore plastics pressure pipe and plastics reinforced pipe.
To achieve the goals above, the technical solution adopted in the utility model are as follows:
A kind of large-bore plastics pressure pipe, including several sections of jurisdiction, all sections of jurisdiction can successively be spliced to form plastics
Pressure pipe tube body, the outer wall of each section of jurisdiction is equipped with several transverse bars along several axial vertical muscle and circumferentially, two neighboring
Sweat soldering between the section of jurisdiction.
Wherein, the section of jurisdiction and vertical muscle are formed using extrusion moulding integral extrusion, and the transverse bar is with the section of jurisdiction and indulges
Muscle is formed or is individually produced after the transverse bar again by the transverse bar sweat soldering described using extrusion moulding integral extrusion
Section of jurisdiction outer wall.
Using a kind of large-bore plastics pressure pipe described in the utility model, each section of jurisdiction outer wall is designed with muscle in length and breadth, increases
The structural strength of strong each section of jurisdiction, so that ensure that entire tube body after successively sweat soldering forms tube body in all sections of jurisdiction
Structural strength, which avoids the monolithic extruded molding problems of major diameter pressure pipe, uniform wall thickness, together
Axis degree is good, and resistance to pressure is strong, and ring stiffness is high, and yields is high.
Preferably, the shapes and sizes of each section of jurisdiction are identical.
Production and storage management using this structure setting, convenient for section of jurisdiction.
Preferably, heating wire is provided in the junction of the two neighboring section of jurisdiction.
It is inbuilt in adjacent section of jurisdiction junction when section of jurisdiction extrusion molding, needing to be spliced into pipe using this structure setting
Heating wire is pressurized to each section of jurisdiction side wall ends in heating, section of jurisdiction, so that multiple section of jurisdiction sweat solderings form homogeneous tube, Zhi Hou electricity
Heated filament is mounted in adjacent section of jurisdiction junction, cuts extra heating wire outside section of jurisdiction.
It preferably, further include heater, each heater includes two plastic sheets being oppositely arranged, two modelings
Clamping is provided with heating wire between tablet, and a heater is arranged in junction when the two neighboring section of jurisdiction is spliced.
Preferably, after all sections of jurisdiction connect into the tube body, the corresponding cross on section of jurisdiction described in each adjacent two
Muscle connection, forms cyclic rib on the tube body.
Preferably, after all sections of jurisdiction connect into the tube body, all vertical muscle and all transverse bars are described
Tube wall forms latticed ribbed stiffener.
Preferably, the tube body includes six to eight sections of jurisdiction.
Using this structure setting, the size of each section of jurisdiction is smaller, production easy to process, quality of finished product good, and yields is high.
Preferably, side wall of each section of jurisdiction along the tube body longitudinal direction is equipped with protrusion, and the two neighboring section of jurisdiction is spelled
After connecing, corresponding two protrusions form a vertical muscle.
Using this structure setting, the area of two neighboring section of jurisdiction junction is increased, so that molding homogeneous tube connection effect
Fruit is good, and structural strength is high, while protrusion forms vertical muscle, further enhances the rigidity of junction, so that homogeneous tube is unlikely to deform.
Preferably, heating wire is provided between corresponding two protrusions.
Preferably, the circumferential thickness along the tube body of all vertical muscle and all transverse bars is equal.
Preferably, the circumferential thickness along the tube body of all vertical muscle and all transverse bars and all sections of jurisdiction
Thickness it is equal.
The utility model additionally provides a kind of plastics reinforced pipe, including the plastic pressure pipe as described in any of the above item, often
Enhancement layer is equipped in a section of jurisdiction.
Wherein, the section of jurisdiction is formed using extrusion moulding integral extrusion, and the section of jurisdiction is described during molding to be added
For strong layer with the section of jurisdiction extrusion molding together, the enhancement layer is mixed similar to reinforcing bar for the effect of the section of jurisdiction of plastics
Coagulate the function and effect of soil.
Using a kind of plastics reinforced pipe described in the utility model, joined wherein in the production process of plastics section of jurisdiction
Strong layer forms reinforced plastics product, compares common plastics section of jurisdiction with stronger impact resistance and mechanical strength, which reinforces
Pipe structure is simple, easy to make, and using effect is good.
Preferably, the enhancement layer includes steel mesh or web.
Preferably, the web is glass fiber mesh.
Preferably, enhancement layer is equipped in all vertical muscle.
Preferably, enhancement layer is equipped in all transverse bars.
The utility model additionally provides a kind of plastics duct piece forming die, comprising:
Feed head, including reinforcement material feed inlet, plastic melt feed inlet and forming cavity, the reinforcement material feed inlet
Be connected to the forming cavity with the plastic melt feed inlet, the charging head for hot melting plastic package reinforcement material and
The forming cavity preliminarily forms the section of jurisdiction shape with enhancement layer；
Stock mould, connects the forming cavity, the stock mould and the reinforcement material feed inlet be relatively arranged on it is described into
Expect head two sides, the sizing for the section of jurisdiction that the stock mould is preliminarily formed for the forming cavity.
Using a kind of plastics duct piece forming die described in the utility model, can direct extrusion molding there is enhancement layer
Plastics section of jurisdiction, so that several subsequent plastics section of jurisdiction sweat solderings with enhancement layer form plastics reinforced pipe.
Preferably, it is set on the charging head there are two the plastic melt feed inlet, two plastic melts are fed
Mouth is relatively arranged on the charger both sides of head.
In conclusion by adopting the above-described technical solution, the beneficial effects of the utility model are:
1, with a kind of large-bore plastics pressure pipe described in the utility model, each section of jurisdiction outer wall is designed with muscle in length and breadth,
Enhance the structural strength of each section of jurisdiction, so that ensure that entire pipe after successively sweat soldering forms tube body in all sections of jurisdiction
The structural strength of body, the plastic pressure pipe avoid the monolithic extruded molding problems of major diameter pressure pipe, uniform wall thickness,
Concentricity is good, and resistance to pressure is strong, and ring stiffness is high, and yields is high；
2, with a kind of large-bore plastics pressure pipe described in the utility model, the shapes and sizes phase of each section of jurisdiction
Together, production and storage management using this structure setting, convenient for section of jurisdiction；
3, with a kind of large-bore plastics pressure pipe described in the utility model, in the junction of the two neighboring section of jurisdiction
It is provided with heating wire, using this structure setting, when section of jurisdiction extrusion molding, needing to be spliced into pipe, in adjacent section of jurisdiction junction
Inbuilt heating wire is pressurized to each section of jurisdiction side wall ends in heating, section of jurisdiction, so that multiple section of jurisdiction sweat solderings form homogeneous tube,
Heating wire is mounted in adjacent section of jurisdiction junction later, cuts extra heating wire outside section of jurisdiction；
4, with a kind of large-bore plastics pressure pipe described in the utility model, the tube body includes six to eight pipes
Piece, using this structure setting, the size of each section of jurisdiction is smaller, production easy to process, quality of finished product good, and yields is high；
5, with a kind of large-bore plastics pressure pipe described in the utility model, each section of jurisdiction is longitudinal along the tube body
Side wall be equipped with protrusion, after two neighboring section of jurisdiction splicing, corresponding two protrusions form a vertical muscle, adopt
With this structure setting, the area of two neighboring section of jurisdiction junction is increased, so that molding homogeneous tube good connecting effect, structure are strong
Degree is high, while protrusion forms vertical muscle, further enhances the rigidity of junction, so that homogeneous tube is unlikely to deform；
6, it with a kind of plastics reinforced pipe described in the utility model, joined wherein in the production process of plastics section of jurisdiction
Enhancement layer forms reinforced plastics product, compares common plastics section of jurisdiction with stronger impact resistance and mechanical strength, which adds
Strong pipe structure is simple, and easy to make, using effect is good；
7, with a kind of plastics duct piece forming die described in the utility model, can direct extrusion molding there is enhancement layer
Plastics section of jurisdiction, so that several subsequent plastics section of jurisdiction sweat solderings with enhancement layer form plastics reinforced pipes.
Detailed description of the invention
Fig. 1 is the section structure diagram of plastic pressure pipe described in embodiment 1；
Fig. 2 is the structural schematic diagram of section of jurisdiction described in Fig. 1；
Fig. 3 is the broken section structural schematic diagram of Fig. 1；
Fig. 4 is the section structure diagram of plastic pressure pipe described in embodiment 2；
Fig. 5 is the structural schematic diagram of section of jurisdiction described in Fig. 4；
Fig. 6 is the section structure diagram of plastics reinforced pipe described in embodiment 3；
Fig. 7 is the structural schematic diagram of section of jurisdiction described in Fig. 6；
Fig. 8 is the broken section structural schematic diagram of Fig. 6；
Fig. 9 is the schematic diagram of plastics duct piece forming die described in embodiment 4.
Marked in the figure: the section of jurisdiction 1-, 11- indulges muscle, 12- transverse bar, the side 2- wall, 3- heating wire, and 4- enhancement layer 5- feeds head,
51- reinforcement material feed inlet, 52- plastic melt feed inlet, 6- stock mould.
Specific embodiment
With reference to the accompanying drawing, the utility model is described in detail.
In order to make the purpose of the utility model, technical solutions and advantages more clearly understood, below in conjunction with attached drawing and implementation
Example, the present invention will be further described in detail.It should be appreciated that specific embodiment described herein is only to explain this
Utility model is not used to limit the utility model.
Embodiment 1
As shown in Figure 1-3, a kind of large-bore plastics pressure pipe described in the utility model, including three shapes and sizes phases
Same section of jurisdiction 1.
All sections of jurisdiction 1 can successively be spliced to form plastic pressure pipe tube body, and the outer wall of each section of jurisdiction 1 is equipped with along axial direction
Several vertical muscle 11 and several transverse bars 12 circumferentially, side wall 2 of each section of jurisdiction 1 along the tube body longitudinal direction be equipped with
Protrusion, after the two neighboring section of jurisdiction 1 is spliced, corresponding two protrusions form a vertical muscle 11, two neighboring institute
Sweat soldering between section of jurisdiction 1 is stated, it is corresponding on section of jurisdiction 1 described in each adjacent two after all sections of jurisdiction 1 connect into the tube body
The transverse bar 12 connects, and cyclic rib is formed on the tube body, all vertical muscle 11 and all transverse bars 12 are in the pipe
External wall forms latticed ribbed stiffener.
Wherein, the section of jurisdiction 1 and vertical muscle 11 are formed using extrusion moulding integral extrusion, and the transverse bar 12 is with the section of jurisdiction
1 and vertical muscle 11 using extrusion moulding integral extrusion form.
As a preferred embodiment of the present embodiment, it is provided with heating wire 3 in the junction of the two neighboring section of jurisdiction 1,
It is provided with heating wire 3 between corresponding two protrusions, using this structure setting, to 1 extrusion molding of section of jurisdiction, needs to splice
When at pipe, the adjacent inbuilt heating wire 3 in 1 junction of section of jurisdiction to each 1 side wall ends of section of jurisdiction while heating, section of jurisdiction 1 while be pressurized, make
It obtains multiple 1 sweat solderings of section of jurisdiction and forms homogeneous tubes, heating wire 3 is mounted in adjacent 1 junction of section of jurisdiction later, and it is extra outside section of jurisdiction 1 to cut
Heating wire 3.
As a preferred embodiment of the present embodiment, all vertical muscle 11 and all transverse bars 12 along the tube body
Circumferential thickness it is equal, the circumferential thickness along the tube body of all vertical muscle 11 and all transverse bars 12 with it is all described
The thickness of section of jurisdiction 1 is equal.
With a kind of large-bore plastics pressure pipe described in the utility model, the shapes and sizes of section of jurisdiction 1 are identical, convenient for pipe
The production of piece 1 and storage management, side wall 2 of the section of jurisdiction 1 along the tube body longitudinal direction are equipped with protrusion, increase two neighboring section of jurisdiction
The area of 1 junction, so that molding homogeneous tube good connecting effect, structural strength is high, while protrusion forms vertical muscle 11, further plus
The strong rigidity of junction, so that homogeneous tube is unlikely to deform, each 1 outer wall of section of jurisdiction is designed with muscle in length and breadth, enhances the knot of each section of jurisdiction 1
Structure intensity, so that ensure that the structural strength of entire tube body after successively sweat soldering forms tube body in all sections of jurisdiction 1, it should
Plastic pressure pipe avoids the monolithic extruded molding problems of major diameter pressure pipe, and uniform wall thickness, concentricity is good, resistance to pressure
By force, ring stiffness is high, and yields is high.
Embodiment 2
As illustrated in figures 4-5, a kind of large-bore plastics pressure pipe described in the utility model, including eight shapes and sizes phases
Same section of jurisdiction 1.
All sections of jurisdiction 1 can successively be spliced to form plastic pressure pipe tube body, and each section of jurisdiction 1 is vertical along the tube body
To side wall 2 be equipped with raised, after the two neighboring section of jurisdiction 1 is spliced, corresponding two protrusions form a vertical muscle 11,
Be circumferentially with several transverse bars 12 along 1 outer wall of section of jurisdiction between the two neighboring vertical muscle 11, the two neighboring section of jurisdiction 1 it
Between sweat soldering, after all sections of jurisdiction 1 connect into the tube body, the corresponding transverse bar on section of jurisdiction 1 described in each adjacent two
12 connections, form cyclic rib, all vertical muscle 11 and all transverse bars 12 are in the tube wall shape on the tube body
At latticed ribbed stiffener.
Wherein, the section of jurisdiction 1 and protrusion are formed using extrusion moulding integral extrusion, and the transverse bar 12 individually produces described
Again by 12 sweat soldering of transverse bar in 1 outer wall of section of jurisdiction after transverse bar 12.
It further include heater as a preferred embodiment of the present embodiment, each heater includes two and sets relatively
The plastic sheet set, clamping is provided with heating wire 3, connection when the two neighboring section of jurisdiction 1 is spliced between two plastic sheets
One heater of place's setting, using this structure setting, when 1 extrusion molding of section of jurisdiction, needing to be spliced into pipe, in adjacent tubes
The inbuilt heater with heating wire 3 in 1 junction of piece is pressurized to each 1 side wall ends of section of jurisdiction in heating, section of jurisdiction 1, so that
Multiple 1 sweat solderings of section of jurisdiction form homogeneous tube, and heating wire 3 is mounted in adjacent 1 junction of section of jurisdiction later, cut extra electricity outside section of jurisdiction 1
Heated filament 3.
As a preferred embodiment of the present embodiment, all vertical muscle 11 and all transverse bars 12 along the tube body
Circumferential thickness it is equal, the circumferential thickness along the tube body of all vertical muscle 11 and all transverse bars 12 with it is all described
The thickness of section of jurisdiction 1 is equal.
With a kind of large-bore plastics pressure pipe described in the utility model, the shapes and sizes of section of jurisdiction 1 are identical, convenient for pipe
The production of piece 1 and storage management, the tube body include eight sections of jurisdiction 1, and the size of each section of jurisdiction 1 is smaller, production easy to process,
Quality of finished product good, yields is high, and side wall 2 of the section of jurisdiction 1 along the tube body longitudinal direction is equipped with protrusion, increases two neighboring section of jurisdiction 1
The area of junction, so that molding homogeneous tube good connecting effect, structural strength is high, while protrusion forms vertical muscle 11, further plus
The strong rigidity of junction, so that homogeneous tube is unlikely to deform, each 1 outer wall of section of jurisdiction is designed with muscle in length and breadth, enhances the knot of each section of jurisdiction 1
Structure intensity, so that ensure that the structural strength of entire tube body after successively sweat soldering forms tube body in all sections of jurisdiction 1, it should
Plastic pressure pipe avoids the monolithic extruded molding problems of major diameter pressure pipe, and uniform wall thickness, concentricity is good, resistance to pressure
By force, ring stiffness is high, and yields is high.
Embodiment 3
As shown in figs 6-8, a kind of plastics reinforced pipe described in the utility model, in plastic pressure pipe described in embodiment 1
On the basis of, it is equipped with enhancement layer 4 in each section of jurisdiction 1, is equipped with enhancement layer 4, all transverse bars in all vertical muscle 11
Enhancement layer 4 is equipped in 12, the enhancement layer 4 includes glass fiber mesh.
Wherein, the section of jurisdiction 1 is formed using extrusion moulding integral extrusion, and the section of jurisdiction 1 is described during molding
Enhancement layer 4 is similar to the effect of the section of jurisdiction 1 of plastics with the extrusion molding together of section of jurisdiction 1, the enhancement layer 4
The function and effect of armored concrete.
With a kind of plastics reinforced pipe described in the utility model, joined wherein in 1 production process of plastics section of jurisdiction
Enhancement layer 4 forms reinforced plastics product, compares common plastics section of jurisdiction 1 with stronger impact resistance and mechanical strength, the plastics
Reinforced pipe structure is simple, easy to make, and using effect is good.
Embodiment 4
As shown in figure 9, a kind of plastics duct piece forming die described in the utility model, described in embodiment 3 for making
A kind of section of jurisdiction 1 with enhancement layer 4 of plastics reinforced pipe, the molding die include:
Feed head 5, including reinforcement material feed inlet 51, two plastic melt feed inlets 52 and forming cavities, the reinforcement
Material feeding mouth 51 is connected to the forming cavity, two plastic melt feed inlets with two plastic melt feed inlets 52
52 are relatively arranged on 5 two sides of charging head, the charging head 5 for hot melting plastic package reinforcement material and it is described at
Type chamber preliminarily forms 1 shape of section of jurisdiction with enhancement layer 4；
Stock mould 6, connects the forming cavity, and the stock mould 6 and the reinforcement material feed inlet 51 are relatively arranged on institute
State charging 5 two sides of head, the sizing for the section of jurisdiction 1 that the stock mould 6 is preliminarily formed for the forming cavity.
With a kind of plastics duct piece forming die described in the utility model, can direct extrusion molding there is enhancement layer 4
Plastics section of jurisdiction 1, so that several subsequent 1 sweat solderings of plastics section of jurisdiction with enhancement layer 4 form plastics reinforced pipes.
The above is only the preferred embodiment of the utility model only, is not intended to limit the utility model, all at this
Made any modifications, equivalent replacements, and improvements etc., should be included in the utility model within the spirit and principle of utility model
Protection scope within.
Claims (10)
1. a kind of large-bore plastics pressure pipe, which is characterized in that including several sections of jurisdiction (1), all sections of jurisdiction (1) can be according to
Secondary to be spliced to form plastic pressure pipe tube body, the outer wall of each section of jurisdiction (1) is equipped with along axial several vertical muscle (11) and circumferentially
Several transverse bars (12), sweat soldering between the two neighboring section of jurisdiction (1).
2. plastic pressure pipe according to claim 1, which is characterized in that the shapes and sizes phase of each section of jurisdiction (1)
Together.
3. plastic pressure pipe according to claim 1, which is characterized in that in the junction of the two neighboring section of jurisdiction (1)
It is provided with heating wire (3).
4. plastic pressure pipe according to claim 1, which is characterized in that all sections of jurisdiction (1) connect into the tube body
Afterwards, all vertical muscle (11) and all transverse bars (12) form latticed ribbed stiffener in the tube wall.
5. plastic pressure pipe according to claim 1, which is characterized in that each section of jurisdiction (1) is longitudinal along the tube body
Side wall (2) be equipped with protrusion, after the two neighboring section of jurisdiction (1) splicing, corresponding two protrusions are formed described in one
Vertical muscle (11).
6. plastic pressure pipe according to claim 5, which is characterized in that be provided with electricity between corresponding two protrusions
Heated filament (3).
7. plastic pressure pipe according to claim 1-6, which is characterized in that all vertical muscle (11) and all
The circumferential thickness along the tube body of the transverse bar (12) is equal.
8. a kind of plastics reinforced pipe, which is characterized in that including such as described in any item plastic pressure pipes of claim 1-7, each
Enhancement layer (4) are equipped in the section of jurisdiction (1).
9. plastics reinforced pipe according to claim 8, which is characterized in that the enhancement layer (4) includes steel mesh or fiber
Net.
10. a kind of plastics duct piece forming die characterized by comprising
It feeds head (5), including reinforcement material feed inlet (51), plastic melt feed inlet (52) and forming cavity, the armature
Material feed inlet (51) is connected to the forming cavity with the plastic melt feed inlet (52), and the charging head (5) is for heating
Plastic wraps reinforcement material simultaneously preliminarily forms section of jurisdiction (1) shape with enhancement layer (4) in the forming cavity；
Stock mould (6), connects the forming cavity, and the stock mould (6) and the reinforcement material feed inlet (51) are relatively arranged on
Charging head (5) two sides, the sizing for the section of jurisdiction (1) that the stock mould (6) preliminarily forms for the forming cavity.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821390868.7U CN208687143U (en) | 2018-08-27 | 2018-08-27 | A kind of large-bore plastics pressure pipe, plastics reinforced pipe and plastics duct piece forming die |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821390868.7U CN208687143U (en) | 2018-08-27 | 2018-08-27 | A kind of large-bore plastics pressure pipe, plastics reinforced pipe and plastics duct piece forming die |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110080799A (en) * | 2019-05-09 | 2019-08-02 | 黄河勘测规划设计研究院有限公司 | The embedded steel compound tube piece making method of side steel suitable for shield formula TBM |
| CN110080798A (en) * | 2019-05-09 | 2019-08-02 | 黄河勘测规划设计研究院有限公司 | Sandwich-type steel compound tube piece making method suitable for shield formula TBM |
| CN110080797A (en) * | 2019-05-09 | 2019-08-02 | 黄河勘测规划设计研究院有限公司 | The board-like steel compound tube piece making method of full Baogang suitable for shield formula TBM |
-
2018
- 2018-08-27 CN CN201821390868.7U patent/CN208687143U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110080799A (en) * | 2019-05-09 | 2019-08-02 | 黄河勘测规划设计研究院有限公司 | The embedded steel compound tube piece making method of side steel suitable for shield formula TBM |
| CN110080798A (en) * | 2019-05-09 | 2019-08-02 | 黄河勘测规划设计研究院有限公司 | Sandwich-type steel compound tube piece making method suitable for shield formula TBM |
| CN110080797A (en) * | 2019-05-09 | 2019-08-02 | 黄河勘测规划设计研究院有限公司 | The board-like steel compound tube piece making method of full Baogang suitable for shield formula TBM |
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