CN108824838A - Prestressed concrete cylinder pipe external prestressing strengthening system and its construction method - Google Patents
Prestressed concrete cylinder pipe external prestressing strengthening system and its construction method Download PDFInfo
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- CN108824838A CN108824838A CN201810992324.6A CN201810992324A CN108824838A CN 108824838 A CN108824838 A CN 108824838A CN 201810992324 A CN201810992324 A CN 201810992324A CN 108824838 A CN108824838 A CN 108824838A
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- prestressed concrete
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- concrete cylinder
- external prestressing
- pipe
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- 239000011513 prestressed concrete Substances 0.000 title claims abstract description 60
- 238000010276 construction Methods 0.000 title claims abstract description 23
- 238000005728 strengthening Methods 0.000 title claims abstract description 21
- 229910000831 Steel Inorganic materials 0.000 claims description 30
- 239000010959 steel Substances 0.000 claims description 30
- 239000004567 concrete Substances 0.000 claims description 22
- 238000009412 basement excavation Methods 0.000 claims description 17
- 238000005260 corrosion Methods 0.000 claims description 17
- 239000000463 material Substances 0.000 claims description 11
- 230000003014 reinforcing effect Effects 0.000 claims description 11
- 239000002689 soil Substances 0.000 claims description 11
- 238000009434 installation Methods 0.000 claims description 8
- 239000004570 mortar (masonry) Substances 0.000 claims description 7
- 238000013461 design Methods 0.000 claims description 4
- 238000005516 engineering process Methods 0.000 claims description 3
- 239000003822 epoxy resin Substances 0.000 claims description 3
- 239000011159 matrix material Substances 0.000 claims description 3
- 229920000647 polyepoxide Polymers 0.000 claims description 3
- 238000002360 preparation method Methods 0.000 claims description 3
- 230000002787 reinforcement Effects 0.000 claims description 3
- 239000011376 self-consolidating concrete Substances 0.000 claims description 3
- 239000002344 surface layer Substances 0.000 claims description 3
- 229920002396 Polyurea Polymers 0.000 claims description 2
- 230000015271 coagulation Effects 0.000 claims 1
- 238000005345 coagulation Methods 0.000 claims 1
- 238000007596 consolidation process Methods 0.000 abstract description 3
- 230000006837 decompression Effects 0.000 abstract description 2
- 230000000694 effects Effects 0.000 abstract description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 4
- 230000001680 brushing effect Effects 0.000 description 3
- 239000003292 glue Substances 0.000 description 3
- 238000004873 anchoring Methods 0.000 description 2
- 230000007797 corrosion Effects 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 239000010410 layer Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000011241 protective layer Substances 0.000 description 2
- 239000004593 Epoxy Substances 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- -1 compressor wire Substances 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 238000001035 drying Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 238000003780 insertion Methods 0.000 description 1
- 230000037431 insertion Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 239000003755 preservative agent Substances 0.000 description 1
- 230000002335 preservative effect Effects 0.000 description 1
- 239000004576 sand Substances 0.000 description 1
- 239000002002 slurry Substances 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04G—SCAFFOLDING; FORMS; SHUTTERING; BUILDING IMPLEMENTS OR AIDS, OR THEIR USE; HANDLING BUILDING MATERIALS ON THE SITE; REPAIRING, BREAKING-UP OR OTHER WORK ON EXISTING BUILDINGS
- E04G23/00—Working measures on existing buildings
- E04G23/02—Repairing, e.g. filling cracks; Restoring; Altering; Enlarging
- E04G23/0218—Increasing or restoring the load-bearing capacity of building construction elements
- E04G23/0225—Increasing or restoring the load-bearing capacity of building construction elements of circular building elements, e.g. by circular bracing
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Mechanical Engineering (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Bulkheads Adapted To Foundation Construction (AREA)
Abstract
The invention discloses a kind of Prestressed concrete cylinder pipe external prestressing strengthening system and its construction methods, including：A plurality of prestress wire on the external wall of Prestressed concrete cylinder pipe is set, and the head and end of a plurality of prestress wire is fixed on anchor plate by anchorage；Prestress wire described in every is fixed on an anchor plate by an anchorage, and prestress wire double-round is wrapped on the external wall of Prestressed concrete cylinder pipe.The present invention can either give full play to the high characteristic of prestress wire tensile strength, it can accomplish that entire pipeline decompression is not cut off the water again, external prestressing strengthening system acts on Prestressed concrete cylinder pipe body structure surface, the globality of the pipe structure of former Prestressed concrete cylinder pipe is not destroyed, and consolidation effect is good.
Description
Technical field
The present invention relates to a kind of Prestressed concrete cylinder pipe (PCCP) external prestressing strengthening technology, can be used for existing disconnected
The reinforcing of silk or the Prestressed concrete cylinder pipe in the structural crack of generation.
Background technique
Prestressed concrete cylinder pipe (prestressed concrete cylinder pipe, abbreviation PCCP) is by protecting
Layer mortar, compressor wire, concrete tube core and antiseepage steel cylinder composition.Compressor wire is the main supporting body of internal pressure, concrete
Tube core is the outer main supporting body of load.Due to manufacture, installation, operation, overload and the influence of extraneous corrosive environment, PCCP tube body meeting
The cracking of protective layer mortar and the longitudinal cracking and steel cylinder of layering, the corrosion of compressor wire and fracture, tube core concrete occurs
Corrosion leakage the defects of, influence the bearing capacity and service life of PCCP, or even pipe explosion accident occurs.The present invention provides one kind
Prestressed concrete cylinder pipe (PCCP) external prestressing strengthening system and its construction method.
Summary of the invention
The present invention provides a kind of along a plurality of prestress steel of laying circumferential outside the Prestressed concrete cylinder pipe that need to be reinforced
Twisted wire, by applying prestressing force, the prestressing force reinforced to Prestressed concrete cylinder pipe overall structure to steel strand wires both ends
Cylinder concrete pipe external prestressing strengthening system and its construction method.
To achieve the goals above, the present invention provides the following technical solutions：
A kind of Prestressed concrete cylinder pipe external prestressing strengthening system, including：It is arranged in prestress steel cylinder concrete
The head and end of a plurality of prestress wire on the tube wall of pipe, a plurality of prestress wire is fixed on anchoring by anchorage
On plate.
Further, prestress wire described in every is fixed on an anchor plate by an anchorage, prestress steel twist
Line double-round is wrapped on the external wall of Prestressed concrete cylinder pipe.
Further, two adjacent anchor plates are staggered on the tube wall of Prestressed concrete cylinder pipe, more
A anchor plate is arranged into two rows, the projection of two adjacent anchor plates to Prestressed concrete cylinder pipe body end face and the section top
The angle degree formed between end position and the section center of circle is all 15 °；Anti-corrosion is arranged in the outside of the anchorage and anchor plate entirety
Confining bed.
A kind of Prestressed concrete cylinder pipe external prestressing strengthening system construction method, includes the following steps：
1) pipe excavation and support are reinforced；
2) construction area is cleared up in preparation of construction, sets up Working gantry and safety is gone along with sb. to guard him；
3) system is laid, basal plane is handled, anchored end installation；
4) ring steel strand；
5) prestressed stretch-draw, locking；
6) stretch-draw anchor end anti-corrosion；
7) concrete surface layer protects, pipeline backfilling of earthwork.
Further, the step 1) the specific steps are：Reinforcing pipe surrounding earth excavation, there are also other around reinforcing pipe
When pipeline, according to reinforcing pipe and adjacent channel relative position, determines and excavate safe distance, while pipe side soil deformation is supervised
It surveys；When that can not determine safe distance, adjacent channel supporting is isolated using Larsen steel sheet pile, it is ensured that lateral cunning does not occur for it
It moves, while pipe side soil deformation is monitored.
Further, the step 3) the specific steps are：Pre-stress system installation site is determined by surveying setting-out, when pre-
The tube surfaces breakage of stress cylinder concrete pipe then uses epoxy resin mortar repairing levelling；The anchor plate of prestress wire intersects
It is laid in Prestressed concrete cylinder pipe body top.
Further, the step 4) the specific steps are：It, need to be in the pipe of Prestressed concrete cylinder pipe before ring steel strand
The slot of reeving perpendicular to its axis is excavated in body bottom, so as to ring steel strand.Threading groove divides equally three parts along length of tube direction, opens
Dig principle be it is intermediate behind first both ends, when excavation based on hand excavation, reduce to the greatest extent and tube bottom soil matrix disturbed.
When threading, steel strand wires should be adjusted in place according to spacing is laid, and it should be made to wind around need to reinforce pre- and answered
The tube surfaces of power cylinder concrete pipe, anchored end locking.After each threading groove completes threading, need to self-compacting concrete or
Solidifying earthen backfill.
Further, the step 5) the specific steps are：Multiple regions are divided along Prestressed concrete cylinder pipe body length,
Prestressed stretch-draw lock sequence is to choose intermediate region first to carry out, secondly two end regions, followed by remaining region is symmetrically completed.
Further, the step 6) the specific steps are：After all prestress wire tensioning fixations, in prestressed reinforcement
The anti-corrosion material of stretch-draw anchor end surfaces brushing 3mm~5mm thickness in system carries out Seal treatment, and anti-corrosion material is polyureas.
Further, the step 7) is used and is protected with a thickness of the C15 concrete of 100mm prestress wire；
It needs to remove the sundries in groove before pipeline backfilling of earthwork, and excludes ponding, must not be backfilled in the case where there is ponding.Backfill
The technical requirements such as thickness and backfill material should be carried out according to original design.
In the above-mentioned technical solutions, Prestressed concrete cylinder pipe external prestressing strengthening system provided by the invention and its
Construction method has the beneficial effect that：The present invention can either give full play to the high characteristic of prestress wire tensile strength, and can
Accomplish that entire pipeline decompression is not cut off the water, external prestressing strengthening system acts on the pipe structure table of Prestressed concrete cylinder pipe
Face, does not destroy the globality of the pipe structure of former Prestressed concrete cylinder pipe, and consolidation effect is good.External prestressing strengthening system
Laying, anchoring and tensioning are convenient, quick construction.By to the preservative treatment of stretch-draw anchor end, it can be achieved that external prestressing strengthening body
The durability of system.
Detailed description of the invention
In order to illustrate the technical solutions in the embodiments of the present application or in the prior art more clearly, below will be to institute in embodiment
Attached drawing to be used is needed to be briefly described, it should be apparent that, the accompanying drawings in the following description is only one recorded in the present invention
A little embodiments are also possible to obtain other drawings based on these drawings for those of ordinary skill in the art.
Fig. 1 is a kind of structure of Prestressed concrete cylinder pipe external prestressing strengthening system provided in an embodiment of the present invention
Schematic diagram；
Fig. 2 is the main view of Fig. 1；
Fig. 3 is the side view of Fig. 1；
Fig. 4 is the structural schematic diagram of prestress wire in Fig. 1, anchorage and anchor plate；
Fig. 5 is the attachment structure schematic diagram of anchorage and anchor plate in Fig. 4；
Fig. 6 is the structural schematic diagram of Prestressed concrete cylinder pipe body in Fig. 1.
Specific embodiment
In order to make those skilled in the art more fully understand technical solution of the present invention, below in conjunction with attached drawing to this hair
It is bright to be further detailed.
As shown in figures 1 to 6, a kind of Prestressed concrete cylinder pipe external prestressing strengthening system described in the embodiment of the present invention
System, including：A plurality of prestress wire 2 on 1 outer wall of tube body of Prestressed concrete cylinder pipe, a plurality of prestress steel are set
The head and end of twisted wire 2 is fixed on anchor plate 4 by anchorage 3.
Prestress wire 2 described in every is fixed on an anchor plate 4 by an anchorage 3,2 double-round of prestress wire
It is wrapped on 1 outer wall of Prestressed concrete cylinder pipe body.
Two adjacent anchor plates 4 are staggered on the outer wall of Prestressed concrete cylinder pipe body 1, multiple anchor plates 4
Two rows are arranged into glue by bonding, two adjacent anchor plates 4 arrive the projection of 1 end face of Prestressed concrete cylinder pipe body and are somebody's turn to do
The angle degree formed between section apical position and the section center of circle is all 15 °；The outside of 4 entirety of the anchorage 3 and anchor plate
Anti-corrosion confining bed 5 is set, and anti-corrosion confining bed 5 is anti-corrosion material.
The Prestressed concrete cylinder pipe body 1 includes：Mortar cover 11, compressor wire 12, inside pipe of concrete
Core 15, outside concrete tube core 13 and antiseepage steel cylinder 14, the insertion of antiseepage steel cylinder 14 inside concrete tube core 15 and outside are mixed
Between solidifying soil tube core 13, the outside of outside concrete tube core 13 is provided with mortar cover 11, outside concrete tube core 13 and sand
Slurry 11 junction of protective layer is wound with compressor wire 12.
Specifically, Prestressed concrete cylinder pipe external prestressing strengthening system, is along the pre-stress steel cylinder that need to be reinforced
1 structural outer surface circumferential direction of concrete tube body lays a plurality of prestress wire 2, and the stretch-draw anchor end of prestress wire 2 intersects
It is laid in 1 top of Prestressed concrete cylinder pipe body, positioned at 15 ° and 345 ° of person of central angle of Prestressed concrete cylinder pipe body 1
Position facilitates subject to installation.By applying prestressing force to 2 both ends of prestress wire, realize external prestressing to prestress steel
The cylinder integrally-built reinforcing of concrete tube body 1,2 both ends of prestress wire after reinforcing are fixed on anchor plate 4 by anchorage 3
On.
1 steel strand wires main mechanical index of table
Wherein：15.2mm is the steel strand wires diameter after peeling washing oil, and band PE steel strand wires diameter is 18.2mm.
The bonding glue technical performance index of table 2
The performance indicator of 3 anti-corrosion material of table
| Project | Performance indicator |
| Viscosity (MPas) | ≥3000 |
| Solid content (%) | ≥80 |
| Surface drying time (h) | ≤6 |
| Tensile strength (MPa) | ≥15 |
| Elongation at break (%) | ≥300 |
| Tearing strength (N/mm) | ≥40 |
| Low-temperature bending (DEG C) | ≤-40 |
| Impermeability (0.4MPa*2h) | It is waterproof |
| Bond strength (MPa) | ≥2.0 |
A kind of Prestressed concrete cylinder pipe external prestressing strengthening system production method described in the embodiment of the present invention, packet
Include following steps：
1) pipe excavation and support are reinforced；
When reinforcing pipe surrounding earth excavation, to avoid adjacent intact pipe from being disturbed, mechanical engagement hand excavation is needed；Machine
After tool is excavated away from pipeline 1.5m, using remaining earthwork of pure hand excavation.Before earth excavation construction, determining tube circumference, whether there is or not undergrounds
Structures prevent from damaging if any that need to indicate its position and depth.After pipeline location is accurately positioned, according to excavation position
It sets and measures unwrapping wire, release and excavate footing and excavation line suitable for reading.If pipeline is a plurality of pipeline, according to reinforcing pipe and adjacent channel
Relative position determines and excavates safe distance, while being monitored to pipe side soil deformation.It can not such as determine safe distance, need to adopt
Adjacent channel supporting is isolated with measures such as Larsen steel sheet piles, it is ensured that lateral sliding does not occur in it, while to pipe side soil deformation
It is monitored.The excavated section of double Prestressed concrete cylinder pipe surface consolidation and Larsen steel sheet pile supporting, the pipe side soil body become
Shape monitors cloth.
2) construction area is cleared up in preparation of construction, sets up Working gantry and safety is gone along with sb. to guard him；
3) system is laid, basal plane is handled, anchored end installation；
Pre-stress system installation site is determined by surveying setting-out, if Prestressed concrete cylinder pipe body surface fracture needs
It is repaired using epoxy resin mortar levelling.The anchored end intersection of prestress wire 2 is laid on Prestressed concrete cylinder pipe body 1
Portion need to polish to basal plane and clear up, use epoxy construction on 15 ° and 345 ° of central angle of Prestressed concrete cylinder pipe body 1
Glue sticking fixes anchor plate.
4) ring wears prestress wire；
Before ring wears prestress wire 2, reeving perpendicular to pipeline need to be excavated at 1 bottom of Prestressed concrete cylinder pipe body
Slot, so that ring wears prestress wire 2.Threading groove divides equally three parts along length of tube direction, depth 200mm, excavating principle is
It is intermediate behind first both ends, when excavation based on hand excavation, reduces to the greatest extent and tube bottom soil matrix is disturbed.
Prestress wire cutting length, which calculates, uses following formula：
L=π * D+2*L1+2*A1
In formula：
The outer diameter of D-PCCP to be reinforced；
L1-both ends tensioning active length, every end is about 1m；
Cushion block center is to anchorage end face length in A1-anchorage component.
When threading, prestress wire 2 should be adjusted in place according to spacing is laid, and wind around it should to need to reinforce
1 surface of Prestressed concrete cylinder pipe body, anchored end locking.After each threading groove completes threading, self-compacting concrete need to be used
Or solidifying earthen backfill, backfill outer should be higher than that base surface 100mm or so, in case tube body rolls.
5) prestressed stretch-draw, locking；
Multiple regions are divided along 1 length of Prestressed concrete cylinder pipe body, prestressed stretch-draw lock sequence is to choose first
Intermediate region carries out, secondly two end regions, followed by remaining region is symmetrically completed.Prestressing force grading tension is to designing tension stress
20%, 25%, 50 ﹪, 75 ﹪, 100 ﹪ of value, ultra stretching to the 115% of design tension stress value., detect stretching end anchorage row
Whether Cheng Weiyi meets the requirement of theoretical elongation, answers by code requirement stretching end anchorage travel displacement with theoretical elongation error
No more than ± 6 ﹪.
6) stretch-draw anchor end anti-corrosion；
It, need to be in prestressed reinforcement in order to guarantee the durability at stretch-draw anchor end after all 2 tensioning fixations of prestress wire
The anti-corrosion material of stretch-draw anchor end surfaces brushing 3mm~5mm in system carries out Seal treatment, to guarantee brushing quality, every time
Brush no more than 1.0mm, anti-corrosion material refer to it is dry after brush next layer, need to repeatedly complete.
7) concrete surface layer protects, pipeline backfilling of earthwork.
Prestress wire 2 is protected using with a thickness of the C15 concrete of 100mm, is needed before pipeline backfilling of earthwork clear
Except the sundries in groove, and ponding is excluded, must not be backfilled in the case where there is ponding.Backfill the technologies such as thickness and backfill material
It is required that should be carried out according to original design.
The above is only a preferred embodiment of the present invention, it is not intended to restrict the invention, it is noted that for this skill
For the those of ordinary skill in art field, without departing from the technical principles of the invention, can also make it is several improvement and
Modification, these improvements and modifications also should be regarded as protection scope of the present invention.
Claims (10)
1. a kind of Prestressed concrete cylinder pipe external prestressing strengthening system, it is characterised in that：Including：
Including：A plurality of prestress wire on the tube wall of Prestressed concrete cylinder pipe, a plurality of prestress steel are set
The head and end of twisted wire is fixed on anchor plate by anchorage.
2. Prestressed concrete cylinder pipe external prestressing strengthening system according to claim 1, which is characterized in that every
The prestress wire is fixed on an anchor plate by an anchorage, and prestress wire double-round is wrapped in pre-stress steel cylinder
On concrete tube body outer wall.
3. Prestressed concrete cylinder pipe external prestressing strengthening system according to claim 1, which is characterized in that adjacent
Two anchor plates be staggered on the tube wall of Prestressed concrete cylinder pipe, multiple anchor plates are arranged into two rows, phase
Projection and the section apical position and the section center of circle of the two adjacent anchor plates to the tube body end face of Prestressed concrete cylinder pipe
Between the angle degree that is formed all be 15 °；Anti-corrosion confining bed is arranged in the outside of the anchorage and anchor plate entirety.
4. a kind of Prestressed concrete cylinder pipe external prestressing strengthening system construction method, includes the following steps：
1) pipe excavation and support are reinforced；
2) construction area is cleared up in preparation of construction, sets up Working gantry and safety is gone along with sb. to guard him；
3) system is laid, basal plane is handled, anchored end installation；
4) ring steel strand；
5) prestressed stretch-draw, locking；
6) stretch-draw anchor end anti-corrosion；
7) concrete surface layer protects, pipeline backfilling of earthwork.
5. Prestressed concrete cylinder pipe external prestressing construction method according to claim 4, it is characterised in that：It is described
Step 1) the specific steps are：Reinforcing pipe surrounding earth excavation, when around reinforcing pipe there are also other pipelines, according to reinforcing pipe and phase
Adjacent pipeline relative position determines and excavates safe distance, while being monitored to pipe side soil deformation；When can not determine safe distance
When, adjacent channel supporting is isolated using Larsen steel sheet pile, it is ensured that lateral sliding does not occur in it, while to pipe side soil deformation
It is monitored.
6. Prestressed concrete cylinder pipe external prestressing construction method according to claim 4, it is characterised in that：It is described
Step 3) the specific steps are：Pre-stress system installation site is determined by surveying setting-out, when the pipe of Prestressed concrete cylinder pipe
Body surface fracture then uses epoxy resin mortar repairing levelling；The anchor plate intersection of prestress wire is laid in pre-stress steel cylinder coagulation
Native tube body top.
7. Prestressed concrete cylinder pipe external prestressing construction method according to claim 4, it is characterised in that：It is described
Step 4) the specific steps are：Before ring steel strand, it need to excavate in the bottom of Prestressed concrete cylinder pipe perpendicular to its axis
The slot of reeving of line, so as to ring steel strand.Threading groove divides equally three parts along length of tube direction, excavate principle be behind first both ends in
Between, when excavation based on hand excavation, reduces to the greatest extent and tube bottom soil matrix is disturbed.
When threading, steel strand wires should be adjusted in place according to spacing is laid, and it should be made to wind around the prestress steel that need to be reinforced
The tube surfaces of cylinder pipe of concrete, anchored end locking.After each threading groove completes threading, self-compacting concrete or dedicated need to be used
Solidify earthen backfill.
8. Prestressed concrete cylinder pipe external prestressing construction method according to claim 4, it is characterised in that：It is described
Step 5) the specific steps are：Multiple regions are divided along Prestressed concrete cylinder pipe body length, prestressed stretch-draw lock sequence is
It chooses intermediate region first to carry out, secondly two end regions, followed by remaining region is symmetrically completed.
9. Prestressed concrete cylinder pipe external prestressing construction method according to claim 4, it is characterised in that：It is described
Step 6) the specific steps are：Stretch-draw anchor end table after all prestress wire tensioning fixations, in prestressed reinforcement system
The anti-corrosion material that 3mm~5mm thickness is brushed in face carries out Seal treatment, and anti-corrosion material is polyureas.
10. Prestressed concrete cylinder pipe external prestressing construction method according to claim 4, it is characterised in that：Institute
Step 7) use is stated to protect prestress wire with a thickness of the C15 concrete of 100mm；It needs to remove before pipeline backfilling of earthwork
Sundries in groove, and ponding is excluded, it must not be backfilled in the case where there is ponding.The technologies such as backfill thickness and backfill material are wanted
Asking should carry out according to original design.
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| CN201810992324.6A CN108824838A (en) | 2018-08-29 | 2018-08-29 | Prestressed concrete cylinder pipe external prestressing strengthening system and its construction method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110056204A (en) * | 2019-04-19 | 2019-07-26 | 同济大学建筑设计研究院(集团)有限公司 | A kind of out no-conhesion prestressing underpins node |
| CN110397819A (en) * | 2019-07-31 | 2019-11-01 | 南方工程检测修复技术研究院 | A kind of fracture of wire PCCP does not cut off the water outer patch Prestressed CFRP and high polymer grouting combined-repair method |
| CN110410613A (en) * | 2019-07-31 | 2019-11-05 | 南方工程检测修复技术研究院 | A kind of PCCP pipeline does not interrupt water delivery restoring and fastening method |
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