CN107386123A - A kind of box beam reserves anchor cable hole construction method - Google Patents
A kind of box beam reserves anchor cable hole construction method Download PDFInfo
- Publication number
- CN107386123A CN107386123A CN201710693011.6A CN201710693011A CN107386123A CN 107386123 A CN107386123 A CN 107386123A CN 201710693011 A CN201710693011 A CN 201710693011A CN 107386123 A CN107386123 A CN 107386123A
- Authority
- CN
- China
- Prior art keywords
- withdrawing rod
- bellows
- box beam
- anchor cable
- withdrawing
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- 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.)
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
- E01D2/04—Bridges characterised by the cross-section of their bearing spanning structure of the box-girder type
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
- E01D2101/26—Concrete reinforced
- E01D2101/28—Concrete reinforced prestressed
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention provides a kind of box beam to reserve anchor cable hole construction method, belongs to Construction Technique of Box field.The present invention comprises the following steps：A, one end of withdrawing rod is closed；B, the withdrawing rod is penetrated in bellows；C, the specified location being installed to the bellows for being installed with the withdrawing rod in box beam；D, the other end unclosed from the withdrawing rod is inflated into the withdrawing rod, and after specified air pressure is inflated to, the other end of the withdrawing rod is closed；E, box beam concrete is carried out to pour；F, the withdrawing rod is deflated after box beam concrete shaping；G, the withdrawing rod is extracted.Method provided by the invention can be reduced in construction to the demand of material quality, reduce the artificial of needs again, and does not interfere with other working procedures, substantially reduce construction cost, and the hole quality of reserved anchor cable hole greatly improves.
Description
Technical field
The invention belongs to Construction Technique of Box field, is to be related to a kind of box beam to reserve anchor cable hole construction party more specifically
Method.
Background technology
The hole quality of the anchor cable hole of prestress anchorage cable is to determine anchorage cable stretching effect or even decision box beam during box girder webs
An important link for quality, the mode of existing reserved anchor cable hole are mainly the method using pipe laying.Due to anchor cable hole aperture
Larger, the compressive property of common tubing is poor, easily the collapse hole when pouring, so steel pipe is typically selected, but the pipe used in pipe laying
Material is disposable, and the cost of steel pipe is high, and the associativity of steel pipe and concrete is poor.
Bellows refers to that appearance has raised tubing annular in shape, due to the design feature of bellows, its radial crush resistance
Can preferably, and the ripple outside bellows can play preferable anchorage effect, reserved prestressed anchor when can be used as box girder webs
The bushing pipe of the anchor cable hole of rope, but because the general tube wall of bellows is relatively thin, and concrete density is larger, so bellows preferably uses
Steel corrugated pipe, there is the antirust problem in view of constructing for a long time, and bellows uses steel preferably with corrugated stainless steel tubing
The cost of bellows or corrugated stainless steel tubing is still higher, and in weld job it is important to note that preventing bellows from breaking
Damage causes concrete to pour in down a chimney, and causes anchor cable hole to close.
Withdrawing rod, withdrawing pipe is called, is a kind of novel core for concrete component minor diameter pore-forming.Withdrawing rod makes
It is usually that withdrawing rod is fixed on corresponding position with retainer ring with method, the withdrawing after the concrete setting poured.
But during the use of reality, because withdrawing rod is softer, it is necessary to could be substantially solid by withdrawing rod using substantial amounts of retainer ring
Determine into a straight line being made up of multiple rips.The installation of substantial amounts of retainer ring both waste of materials, the manpower that increase needs again,
Efficiency of construction is not high.In order to reduce retainer ring number, the reinforcing bar of certain diameter is penetrated in the mesopore of withdrawing pipe sometimes, is taken out
First extract reinforcing bar when pulling out out, then withdrawing is carried out to barred body.But because the withdrawing of withdrawing rod needs not formed completely by force in concrete
Carried out when spending, to prevent concrete to be tightly combined after reaching some strength with withdrawing rod, cause withdrawing rod to be difficult to extract, and coagulation
Concrete internal temperature is higher when soil does not form intensity completely, and concrete expansion degree is larger, has actually also compressed withdrawing rod, has taken out
The withdrawing of spike pulling is also relatively difficult.The pore-forming for carrying out anchor cable hole using withdrawing rod when pouring box beam simultaneously further encounters following ask
Topic：1. the box beam concrete amount of pouring is big, if excessive may result in of the concreting time phase difference at withdrawing rod both ends is difficult to select
Withdrawing opportunity is selected, adds the difficulty of withdrawing；2. the quality of rubber materials of withdrawing rod can not be lubricated using oil lubricant, taking out
It is easy to be scratched by the aggregate in concrete during pulling out, causes service life to decline；3. the elastomeric material of withdrawing rod is easy
Being influenceed by welding job, and be exposed in long-term work progress, the influence exposed to the weather can accelerate ageing of rubber,
Withdrawing rod is caused to be difficult to withdrawing or fracture.
The content of the invention
It is an object of the invention to provide a kind of box beam to reserve anchor cable hole construction method, to solve present in prior art
The technical problem that anchor cable hole cost is high and pore-forming effect is poor is reserved in box girder webs.
To achieve the above object, the technical solution adopted by the present invention is：A kind of box beam is provided and reserves anchor cable hole construction method,
Comprise the following steps：A, one end of withdrawing rod is closed；B, the withdrawing rod is penetrated in bellows, and makes what withdrawing rod was closed
Expose one end；C, the specified location being installed to the bellows for being installed with the withdrawing rod in box beam；D, from the withdrawing rod
In the unclosed other end inflated into the withdrawing rod, after specified air pressure is inflated to, by another end seal of the withdrawing rod
Close；E, box beam concrete is carried out to pour；F, the withdrawing rod is deflated after box beam concrete shaping；G, by the withdrawing
Rod is extracted.
Further, a kind of foregoing box beam is reserved in anchor cable hole construction method, and following step is also included in the step A
Suddenly：The withdrawing rod and the bellows are checked.
Further, a kind of foregoing box beam is reserved in anchor cable hole construction method, described to the withdrawing rod and described
Bellows carries out inspection and comprised at least：Check the inside and outside through crack and transverse crack of the withdrawing rod；
Check the smoothness of inner wall of the bellows.
Further, a kind of foregoing box beam is reserved in anchor cable hole construction method, and following step is also included in the step B
Suddenly：When the withdrawing rod is penetrated in the bellows, inorganic lubricant is smeared on the withdrawing rod.
Further, a kind of foregoing box beam is reserved in anchor cable hole construction method, and the step B also includes：
After the withdrawing rod penetrates the bellows, the withdrawing rod both ends are made to be exposed independent from the bellows, and exposed length is extremely
It is the 10% of bellows overall length less.
Further, a kind of foregoing box beam is reserved in anchor cable hole construction method, and following step is also included in the step C
Suddenly：The withdrawing rod both ends are pulled, stretch the withdrawing rod.
Further, a kind of foregoing box beam is reserved in anchor cable hole construction method, is also included before the step E：To envelope
The withdrawing rod after closing carries out leak test.
Further, a kind of foregoing box beam is reserved in anchor cable hole construction method, and following step is also included in the step G
Suddenly：The steel strand wires of anchor cable are connected in one end of the withdrawing rod, the other end of withdrawing rod described in pull, make the withdrawing rod by steel
Twisted wire is brought into the bellows, until the withdrawing rod is fully drawn out, steel strand wires are completely through the bellows.
Further, a kind of foregoing box beam is reserved in anchor cable hole construction method, and the withdrawing rod diameter is than the ripple
Small 1mm~the 5mm of pipe diameter.
Further, a kind of foregoing box beam is reserved in anchor cable hole construction method, and air pressure is 0.3MPa in the withdrawing rod
~1MPa.
The beneficial effect that a kind of box beam provided by the invention reserves anchor cable hole construction method is：Compared with prior art,
Withdrawing rod of the invention by setting inflation in bellows, withdrawing rod is supported bellows, greatly reduce box beam
The requirement that reserved anchor cable hole is constructed to bellows compression strength, can meet to use needs using cheap plastic film capicitor, and
And due to there is the supporting role of withdrawing rod, even if bellows slightly has breakage, also because concrete pours in down a chimney anchor cable hole will not be caused to seal
Close, while bellows can also protect the withdrawing rod of inside, reduce further requirement of shelter of the work progress to bellows；And
Because bellows interior is more smooth than inside concrete, the withdrawing opportunity of withdrawing rod need not be selected after the completion of box girder webs, will
After withdrawing rod is deflated, withdrawing rod can be extracted easily, and whole process is not almost damaged to withdrawing rod, substantially prolongs withdrawing rod
Service life；In addition, bellows has certain rigidity in itself, can still be protected in the case where using less connection ring
The straight of itself is demonstrate,proved, along with the supporting role of the withdrawing rod after inflation, the hole quality of anchor cable hole can be effectively ensured.
To sum up, method provided by the invention can be reduced in construction to the demand of material quality, reduce the artificial of needs again, and not
Other working procedures can be influenceed, substantially reduce construction cost, the hole quality of reserved anchor cable hole greatly improves.
Embodiment
In order that technical problems, technical solutions and advantages to be solved are more clearly understood, tie below
Embodiment is closed, the present invention will be described in further detail.It should be appreciated that specific embodiment described herein is only explaining
The present invention, it is not intended to limit the present invention.
It is to be appreciated that term " length ", " width ", " on ", " under ", "front", "rear", "left", "right", " vertical ",
The orientation or position relationship of the instruction such as " level ", " top ", " bottom " " interior ", " outer " are for only for ease of the description present invention and simplification is retouched
State, rather than instruction or imply signified device or element there must be specific orientation, with specific azimuth configuration and operation,
Therefore it is not considered as limiting the invention.
Now anchor cable hole construction method is reserved to a kind of box beam provided by the invention to illustrate.The box beam reserves anchor cable hole
Construction method, comprise the following steps：A, one end of withdrawing rod is closed；B, the withdrawing rod is penetrated in bellows, and makes to take out
Expose one end of spike pulling closing；C, the specified location being installed to the bellows for being installed with the withdrawing rod in box beam；D, to
Inflate in the withdrawing rod, after specified air pressure is inflated to, the other end of the withdrawing rod is closed；E, box beam concrete is carried out
Pour；F, the withdrawing rod is deflated after box beam concrete shaping；G, the withdrawing rod is extracted.
During actual use, the size of withdrawing rod needs to cooperate with bellows, ensures that withdrawing rod can penetrate bellows,
Meanwhile bellows side wall can be contacted after the inflation of withdrawing rod, play a supporting role.Into withdrawing rod, inflation can be from the withdrawing rod
In unclosed other end inflation, can also separately set the structure for inflation.Into withdrawing rod, inflation can also use the side of water-filling
Formula replaces, and water-filling can more preferably keep the pressure in withdrawing rod, but water can increase the weight of withdrawing rod, and aggravation bellows is because of weight
The degree of sag of power.
Box beam provided by the invention reserves anchor cable hole construction method, compared with prior art, by being set in bellows
The withdrawing rod of inflation, makes withdrawing rod be supported bellows, greatly reduces box beam reserved anchor cable hole construction and bellows is resisted
The requirement of Compressive Strength, it can meet to use needs using cheap plastic film capicitor, and due to there is the supporting role of withdrawing rod,
Even if bellows slightly has breakage, also because concrete pours in down a chimney anchor cable hole will not be caused to close, while bellows can also protect inside
Withdrawing rod, reduce further requirement of shelter of the work progress to bellows；And because bellows interior is than in concrete
Portion is more smooth, and the withdrawing opportunity of withdrawing rod need not be selected after the completion of box girder webs, and after withdrawing rod is deflated, withdrawing rod can be light
Pine is extracted, and whole process is not almost damaged to withdrawing rod, substantially prolongs the service life of withdrawing rod；In addition, bellows sheet
Body has certain rigidity, can still ensure the straight of itself in the case where using less connection ring, along with inflation
The supporting role of withdrawing rod afterwards, the hole quality of anchor cable hole can be effectively ensured.To sum up, method provided by the invention had been both
It can reduce in construction to the demand of material quality, reduce the artificial of needs again, and not interfere with other working procedures, make
Construction cost substantially reduces, and the hole quality of reserved anchor cable hole greatly improves.
Further, a kind of embodiment of anchor cable hole construction method, institute are reserved as box beam provided by the invention
State further comprising the steps of in step A：The withdrawing rod and the bellows are checked.Using the step for be to protect
Card subsequent construction is smoothed out, and is reduced as far as being difficult to after withdrawing rod and bellows installation or after pre- concrete of nuzzling
The possibility of the problem of processing.
Further, a kind of embodiment of anchor cable hole construction method, institute are reserved as box beam provided by the invention
That states carries out inspection to the withdrawing rod and the bellows and comprises at least：Check the inside and outside through crack and horizontal stroke of the withdrawing rod
To crack；Check the smoothness of inner wall of the bellows.Inspection to withdrawing rod can use inflation and outer painting soap aqueous phase knot
The detection method of conjunction, the method that water-filling can also be used., can be with if withdrawing rod without inside and outside through crack, meets the requirements
Use；If through crack is less and smaller and centrally located inside and outside withdrawing rod, actually can after being inflated due to withdrawing rod
Bellows is closed at both ends, bellows interior gas also more difficult spilling, and the later stage method of tonifying Qi can be used to reach fixed
Air pressure, at this moment can optionally use；If through crack is more inside and outside withdrawing rod, withdrawing rod is in follow-up work progress
Serious gas leak phenomenon can be produced, is also difficult with even if tonifying Qi always, then needs the withdrawing rod more renewed.Transverse crack refers to
Direction is along the crack of withdrawing rod ring.If withdrawing rod does not have, transverse crack or transverse crack are smaller and be evenly distributed, can
To be continuing with；If withdrawing rod transverse crack is larger or distribution is more concentrated, it is likely that causes to take out in pull or withdrawing
Spike pulling gas leakage is even broken.As long as checking that the smoothness of inner wall of bellows checks whether bellows interior has hangnail, prevent from taking out
Spike pulling scratches.
Further, a kind of embodiment of anchor cable hole construction method, institute are reserved as box beam provided by the invention
State further comprising the steps of in step B：When the withdrawing rod is penetrated in the bellows, nothing is smeared on the withdrawing rod
Machine lubricant.The use of lubricant can easily facilitate the withdrawing of withdrawing rod, further reduce whole work progress to material
The requirement of energy, be advantageous to extend the service life of withdrawing rod, reduce cost.During actual use inorganic lubricant also will select not with
Withdrawing rod produces the inorganic lubricant of chemical reaction, the lubricant of inorganic lubricant preferably powdered, to ensure that later stage anchor cable is in the milk
When slurries and bellows side wall abundant combination., will not be with coagulation because inorganic lubricant is between bellows and withdrawing rod
Soil contact, so dosage is less, while does not interfere with the performance of concrete yet.This point is single use withdrawing rod and is unable to reach
's.
Further, a kind of embodiment of anchor cable hole construction method, institute are reserved as box beam provided by the invention
Stating step B also includes：After the withdrawing rod penetrates the bellows, the withdrawing rod both ends are made to be exposed independent from the bellows, and
Exposed length is at least the 10% of bellows overall length, to ensure that withdrawing rod will not be collapsible into bellows interior after inflating, makes subsequently to take out
The process of pulling out is difficult to.
Further, a kind of embodiment of anchor cable hole construction method, institute are reserved as box beam provided by the invention
State further comprising the steps of in step C：The withdrawing rod both ends are pulled, stretch the withdrawing rod.The step for both
It is in order to which withdrawing rod is stretched, is that withdrawing rod can drive when pulling withdrawing rod in order to be further ensured that the straight of bellows again
Bellows, the position that bellows distorts is straightened, while alleviate the bellows degree sagging because of gravity, withdrawing rod can also be made
It is more straight after inflation, solve the problems, such as withdrawing rod because local accumulation and caused by distort, bellows is played and preferably supported
Effect, improve pore-forming effect.
Further, a kind of embodiment of anchor cable hole construction method, institute are reserved as box beam provided by the invention
Also include before stating step E：Leak test is carried out to the withdrawing rod after closing.The step for mainly it is right before pouring
Withdrawing rod carries out last inspection, prevent bellows be installed in place after construction in withdrawing rod is caused serious harm after be difficult to send out
It is existing, when preventing box girder webs, bellows interior underbraced, cause collapse hole, so as to cause the extraction of withdrawing rod difficult.But i.e.
Make, in the case where collapse hole occurs, because bellows interior also has withdrawing rod, will not also cause anchor cable hole to be closed, as long as withdrawing rod
It can extract, the anchor cable hole still can use.
Further, a kind of embodiment of anchor cable hole construction method is reserved as box beam provided by the invention,
It is further comprising the steps of in step G：The steel strand wires of anchor cable are connected in one end of the withdrawing rod, withdrawing rod is another described in pull
End, makes the withdrawing rod bring steel strand wires in the bellows into, until the withdrawing rod is fully drawn out, steel strand wires completely through
The bellows.The step for be installation for the ease of anchor cable, because bellows has completely cut off between anchor cable hole and concrete
Water_air exchange, even if work progress is longer, it will not also cause the corrosion of steel strand wires.
Further, a kind of embodiment of anchor cable hole construction method, institute are reserved as box beam provided by the invention
It is smaller 1mm~5mm than the ripple pipe diameter to state withdrawing rod diameter, in order to which withdrawing rod smoothly penetrates bellows, and withdrawing rod
Ripple inside pipe wall can be withstood after inflation completely, plays good supporting role.
Further, a kind of embodiment of anchor cable hole construction method, institute are reserved as box beam provided by the invention
It is 0.3MPa~1MPa to state air pressure in withdrawing rod, to offset other caused stress in concrete pressure and work progress.
The foregoing is merely illustrative of the preferred embodiments of the present invention, is not intended to limit the invention, all essences in the present invention
All any modification, equivalent and improvement made within refreshing and principle etc., should be included in the scope of the protection.
Claims (10)
1. a kind of box beam reserves anchor cable hole construction method, it is characterised in that comprises the following steps：
A, one end of withdrawing rod is closed；
B, the withdrawing rod is penetrated in bellows, and the one end for closing withdrawing rod is exposed；
C, the specified location being installed to the bellows for being installed with the withdrawing rod in box beam；
D, the other end unclosed from the withdrawing rod is inflated into the withdrawing rod, after specified air pressure is inflated to, by institute
State the other end closing of withdrawing rod；
E, box beam concrete is carried out to pour；
F, the withdrawing rod is deflated after box beam concrete shaping；
G, the withdrawing rod is extracted.
2. a kind of box beam as claimed in claim 1 reserves anchor cable hole construction method, it is characterised in that is also wrapped in the step A
Include following steps：
The withdrawing rod and the bellows are checked.
3. a kind of box beam as claimed in claim 2 reserves anchor cable hole construction method, it is characterised in that described to the withdrawing
Rod and the bellows carry out inspection and comprised at least：
Check the inside and outside through crack and transverse crack of the withdrawing rod；
Check the smoothness of inner wall of the bellows.
4. a kind of box beam as claimed in claim 1 reserves anchor cable hole construction method, it is characterised in that is also wrapped in the step B
Include following steps：
When the withdrawing rod is penetrated in the bellows, inorganic lubricant is smeared on the withdrawing rod.
5. a kind of box beam as claimed in claim 1 reserves anchor cable hole construction method, it is characterised in that the step B also includes：
After the withdrawing rod penetrates the bellows, the withdrawing rod both ends are made to be exposed independent from the bellows, and exposed length is extremely
It is the 10% of bellows overall length less.
6. a kind of box beam as claimed in claim 1 reserves anchor cable hole construction method, it is characterised in that is also wrapped in the step C
Include following steps：
The withdrawing rod both ends are pulled, stretch the withdrawing rod.
7. a kind of box beam as claimed in claim 1 reserves anchor cable hole construction method, it is characterised in that before the step E also
Including：
Leak test is carried out to the withdrawing rod after closing.
8. a kind of box beam as claimed in claim 1 reserves anchor cable hole construction method, it is characterised in that is also wrapped in the step G
Include following steps：
The steel strand wires of anchor cable are connected in one end of the withdrawing rod, the other end of withdrawing rod described in pull, make the withdrawing rod will
Steel strand wires are brought into the bellows, until the withdrawing rod is fully drawn out, steel strand wires are completely through the bellows.
9. a kind of box beam as claimed in claim 1 reserves anchor cable hole construction method, it is characterised in that the withdrawing rod diameter ratio
Small 1mm~the 5mm of ripple pipe diameter.
10. a kind of box beam as claimed in claim 1 reserves anchor cable hole construction method, it is characterised in that gas in the withdrawing rod
Press as 0.3MPa~1MPa.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710693011.6A CN107386123A (en) | 2017-08-14 | 2017-08-14 | A kind of box beam reserves anchor cable hole construction method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710693011.6A CN107386123A (en) | 2017-08-14 | 2017-08-14 | A kind of box beam reserves anchor cable hole construction method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN107386123A true CN107386123A (en) | 2017-11-24 |
Family
ID=60354770
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710693011.6A Pending CN107386123A (en) | 2017-08-14 | 2017-08-14 | A kind of box beam reserves anchor cable hole construction method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107386123A (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09170203A (en) * | 1995-12-21 | 1997-06-30 | Isumitsuku:Kk | Method of reinforcing stud of elevated bridge |
| JP2002097746A (en) * | 2000-09-21 | 2002-04-05 | Dps Bridge Works Co Ltd | Frp reinforced materials with anchorage device |
| CN204725659U (en) * | 2015-05-22 | 2015-10-28 | 中铁七局集团西安铁路工程有限公司 | Post stretching simple supported box beam rubber pulling rod rod poling machine |
| CN105625191A (en) * | 2016-02-02 | 2016-06-01 | 中交一公局第二工程有限公司 | Construction method of segment girder prestressed pipeline |
| CN205474852U (en) * | 2016-02-02 | 2016-08-17 | 中交一公局第二工程有限公司 | Segment girder prestressed pipe positioner |
-
2017
- 2017-08-14 CN CN201710693011.6A patent/CN107386123A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH09170203A (en) * | 1995-12-21 | 1997-06-30 | Isumitsuku:Kk | Method of reinforcing stud of elevated bridge |
| JP2002097746A (en) * | 2000-09-21 | 2002-04-05 | Dps Bridge Works Co Ltd | Frp reinforced materials with anchorage device |
| CN204725659U (en) * | 2015-05-22 | 2015-10-28 | 中铁七局集团西安铁路工程有限公司 | Post stretching simple supported box beam rubber pulling rod rod poling machine |
| CN105625191A (en) * | 2016-02-02 | 2016-06-01 | 中交一公局第二工程有限公司 | Construction method of segment girder prestressed pipeline |
| CN205474852U (en) * | 2016-02-02 | 2016-08-17 | 中交一公局第二工程有限公司 | Segment girder prestressed pipe positioner |
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Application publication date: 20171124 |