CN107938517B - A kind of cable-stayed bridge prestressed concrete beam ring anchor construction method - Google Patents
A kind of cable-stayed bridge prestressed concrete beam ring anchor construction method Download PDFInfo
- Publication number
- CN107938517B CN107938517B CN201711162764.0A CN201711162764A CN107938517B CN 107938517 B CN107938517 B CN 107938517B CN 201711162764 A CN201711162764 A CN 201711162764A CN 107938517 B CN107938517 B CN 107938517B
- Authority
- CN
- China
- Prior art keywords
- ring anchor
- steel strand
- strand wires
- anchor
- stretching
- 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.)
- Active
Links
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
- E01D19/00—Structural or constructional details of bridges
- E01D19/14—Towers; Anchors ; Connection of cables to bridge parts; Saddle supports
-
- 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
Landscapes
- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The present invention discloses a kind of cable-stayed bridge prestressed concrete beam ring anchor construction method, close up applied to span in cable-stayed bridge main-beam, it is main comprising steps of pre-buried ring anchor stretching notch, prestressed pipeline, pour beam section, installation steel strand wires and anchorage, tensioner installation, prestressing force are implemented, pour ring anchor stretching notch pipeline pneumatic mortar.Core of the invention is to connect steel strand wires using two-way ring anchor, implement two dimension prestressing, it is still belonged to the first time in prestressed concrete cable-stayed bridge construction using two-way ring anchor prestress anchoraging mode, this method is simple and practical, reduce construction risk, the risk for reducing prestressed failure improves the durability of structure.
Description
Technical field
The present invention relates to a kind of cable-stayed bridge prestressed Construction Technology fields, and in particular to a kind of cable-stayed bridge prestressed concrete
Beam construction method.
Background technique
The prestressed application of beams of concrete, in the latter stage fifties, China uses bar reinforcement electrothermal way to round reservoir for the first time
(tank) applies prestressing force；The mid-1960s, start using wrapping wire prestressing force, with the appearance of the round buildings such as large silo, around
Silk prestressing force has been difficult to meet the requirements.Zhujiang Cement raw clinker warehouse in China's successfully uses large-tonnage steel strand bundle for the first time.Later,
There are bonding and soap-free emulsion polymeization annular post-tensioned pre-stressed technology to be widely used in silo, reservoir, sewage digesting pool, nuclear plant safety
In the unique constructions such as shell, television tower.
For cable-stayed bridge, with progress of the epoch, a series of higher rachis face cable-stayed bridge of quality index is had devised,
Rachis face cable-stayed bridge generallys use concrete box girder as girder, and concrete box girder is other than bearing bending stress, it is also necessary to
Bear the pulling force from suspension cable.The longitudinal prestressing that cable-stayed bridge needs is big, and end bay closure segment is generally used in across closure segment
Steel strand wires apply prestressing force close up, closure segment prestressing force can using ordinary connector connect, in generally adopted at present across closure segment
With prestress anchoraging mode is applied on tooth plate, construction is complicated, and quality is difficult to control.In addition, existing anchorage style is all one
As be all single-ended or both ends tensioning in steel strand wires, the beam at both ends can not be tied down simultaneously with the same anchorage, be leaned in opposite directions
Hold together.
Summary of the invention
For this purpose, the present invention puts forth effort on the deficiency for solving the above-mentioned prior art, a kind of cable-stayed bridge prestressed concrete ring is provided
Anchor construction method is applied in cable-stayed bridge main-beam reduce the risk of beam body cracking and prestressed failure across closure segment, improve
Girder construction durability.
It is as follows that the present invention solves the technical solution that the above technical problem is taken: a kind of cable-stayed bridge prestressed concrete beam ring
Anchor construction method closes up applied to span in cable-stayed bridge main-beam, includes the following steps:
Step 1: pre-buried ring anchor stretching notch, reserves tension slot groove before pouring in girder across left and right two beam sections either segment
Mouthful；
Step 2: prestressed pipeline, reserves the pre- of steel strand wires installation before pouring in girder across left and right two beam section
Stress pipeline；
Step 3: pouring across left and right two beam section in girder, the position for reserving ring anchor stretching notch is not poured；
Step 4: installation steel strand wires and anchorage, two-way on ring anchor after pouring in girder across left and right two beam section
Steel strand wires are installed, twocouese steel strand wires one end is fixed respectively, and the other end, on ring anchor, is worn in opposite directions in ring anchor stretching notch centre-exchange-meeting
Row, is pierced by length in reserve after ring anchor, a direction steel strand wires are as anchored end steel strand wires, and other direction steel strand wires are as stretching end steel
Twisted wire；
The ring anchor is free in the ring anchor stretching notch；
Step 5: tensioner is installed, includes deflector in the tension tool, stretching end steel strand wires are drawn into the ring
Anchor stretching notch；
Step 6: prestressing force implements and control；
Step 7: prestress application finishes, tension tool is removed, pours ring anchor stretching notch, pipeline pneumatic mortar, beam body entirety
It completes.
The wherein ring anchor, including a ring anchor ontology are provided on ring anchor ontology and are anchored hole, the anchor Kong Huan
Symmetrical twocouese opens up on anchor ontology, wears in the anchor hole and connects the steel strand wires.
Further, the anchor hole in one direction is oblique hole, the anchor Kong Weiping in another direction
Row hole；Alternatively, the anchor hole on twocouese is parallel hole；Again alternatively, the anchor hole on twocouese is
Oblique hole.
Also further, the anchor hole in all directions at least there are two, around the central symmetry of the ring anchor ontology
Setting.
The ring anchor stretching notch therein, be enclosed steel plate made of.
Further, the ring anchor stretching notch surrounds a square groove by four steel plates, upper opening, dissociates in slot and places
The ring anchor；Reinforced steel bar ring is welded on the surrounding outer wall of the square groove；The square groove is reserved with upwards in steel strand wires connection side and wears
String holes is welded with steel strand wires confinement ring in threading outer end of hole.
When construction, for being arranged side by side in the girder for having the left and right beam section of multiple groups across the ring anchor stretching notch is arranged alternately
In the left and right beam section of each group, that is, if the 1st ring anchor stretching notch is arranged in the left beam section of the 1st group of beam, the 2nd ring
Anchor stretching notch is arranged in the right beam section of the 2nd group of beam, and the 3rd ring anchor stretching notch is arranged in the left beam section of the 3rd group of beam, according to
It is secondary to analogize.
When construction, first in the fixed beam on the outside of closure segment beam, steel strand wires are anchored with ordinary connector anchorage, then by steel
Twisted wire pierces into ring anchor stretching notch from prestress pipe；Before steel strand wires pierce into ring anchor, first it is anchored in hole and is inserted in ring anchor
Then stretching end steel strand wires are first inserted in ring anchor by intermediate plate, then anchored end steel strand wires are reversely inserted in ring anchor, finally buy intermediate plate
Tightly；The anchored end steel strand wires reserve tensioning active length according to design length blanking, the stretching end steel strand wires；The ring anchor
Installation site increases certain surplus capacity according to the anchorage amount of movement estimated further along, and the surplus capacity is reserved by 10-15cm.
When applying prestressing force, steel strand tension uses dual control technique, is stretching force and elongation dual control, wherein elongation needs
The elongation Lm and stretching end steel strand wires elongation Lz of anchored end steel strand wires are controlled, the overhang Ld of very heavy top steel strand wires is pressed
Following formula calculates:
Ld=Lm+Lz
Using the linear relationship of linear regression analysis elongation and stretching force.
Further, in dress at the beginning of tension tool, jack tension is to the 10% of builder's tonnage, in tensioning when practical operation
Power measures elongation when being 20%, 40%, 60%, 80%, the 100% of builder's tonnage, holds lotus respectively 2 minutes.
It is still belonged to the first time in prestressed concrete cable-stayed bridge construction using ring anchor prestress anchoraging mode, this method is simply real
With, construction risk is reduced, the risk of prestressed failure is reduced, improves the durability of structure, the construction and design method
Industry approval has been won, has achieved preferable social benefit in Bradley bavin bridge construction market.
Compared with prior art, the present invention significantly has the beneficial effect that:
1. closure segment prestressing force of the present invention is anchored using ring anchor, instead of traditional closure segment tooth plate anchorage style, reduce
The risk of beam body cracking and prestressed failure, improves girder construction durability.
2. avoiding the processing of tooth block construction and tooth block abnormal formwork, difficulty of construction is reduced.
3. tensioning is easy due to doing deflection traction, directly tensioning work can be carried out in bridge floor, what reduction was constructed in beam bottom
Operation difficulty and construction risk.
Other features and advantages of the present invention will illustrate in the following description, and partial become from specification
It is clear that understand through the implementation of the invention.
Detailed description of the invention
Attached drawing is only used for showing the purpose of specific embodiment, and is not to be construed as limiting the invention, in entire attached drawing
In, identical reference symbol indicates identical component.
Fig. 1 is that schematic diagram is seen in the side of ring shape anchorage provided by the invention；
Fig. 2 is the A-A cross-sectional view in Fig. 1；
Fig. 3 is ring anchor stretching notch schematic diagram provided by the invention；
Fig. 4 is the top view of Fig. 3；
Fig. 5 is scheme of installation of the ring anchor in stretching notch；
Fig. 6 is cable-stayed bridge prestressed concrete beam ring anchor construction method flow chart；
Fig. 7 is layout drawing of the anchorage in each beam section of cable-stayed bridge main-beam closure segment；
Fig. 8 is tension tool construction drawing；
Fig. 9 is the linear regression relation figure of stretching force and the practical elongation of steel strand wires.
Specific embodiment
The present invention is described in detail below with reference to the accompanying drawings and embodiments.
This construction method is suitable for cable-stayed bridge beams of concrete closure segment pre-stress system, and pre-buried steel strand wires are applied in beams of concrete
The technological principle of the situation of Prestressing, this method is, using a kind of special ring shape anchorage by the concrete at closure segment both ends
Steel strand wires in beam beam body are attached, and are mutually drawn over to one's side, while applying prestressing force on two sections of beams, are belonged to a kind of novel post-tensioned pre-
Prestressed concrete technology.
Before introducing construction method of the present invention, the Novel ring anchor structure used is first introduced:
As shown in Figure 1 and Figure 2, a kind of ring anchor 1, including a ring anchor ontology 11 are provided on ring anchor ontology 11 and are anchored hole
12, the whole thickness direction for being anchored hole 12 and running through the ring anchor ontology 11.
Anchor hole 12 can be further can by the bellmouth that one section of straight hole section 121 and one section of taper hole section 122 form
Being anchored hole both ends, technique reaming 123 is set.The taper of straight hole section 121 and 122 natural sparse model of taper hole section, taper hole section 122 is 1:
10~1:30, preferably 1:20, small end are connected in straight hole section 121.In general, it is entirely being anchored on hole length, 121 He of straight hole section
Taper hole section 122 about respectively accounts for half length or taper hole section is less than straight hole section.
It is anchored hole 12 and is also possible to an isodiametric cylindrical hole.
This ring anchor provided by the invention, feature are exactly in prestress wire anchor, which can be used for two-way
Steel strand wires connection, so being anchored hole 12 is that twocouese opens up on ring anchor ontology 11, i.e., steel strand wires both can be from ring anchor just
Face penetrates, and (front, the back side refer both to thickness direction) can also be penetrated from the back side of ring anchor, the steel strand wires of both direction can be mutual
Applying prestressing force for active force draws close two closure segments.So should have twocouese arrangement for the anchor hole 12 on ring anchor,
Middle taper hole section 122 should be provided with the steel strand wires traversing through end on ring anchor, be gradually reaming shape in traversing through end taper hole section 122, until end
Face.
Multiple such holes 12 that are anchored respectively can be set on twocouese on ring anchor ontology 11 such as in one embodiment can
Be arranged two-way 8, it is 4 unidirectional as be anchored hole.It is preferred that the anchor hole number of twocouese is preferably consistent, also, every
The anchor hole in one direction will be centrosymmetrically arranged relative to ring anchor ontology 11.
For the blowing angle for being anchored hole 12, the axis for being anchored hole 12 can be with the center of 11 thickness direction of ring anchor ontology
Line is parallel (referred to as parallel hole), can also be angled (referred to as oblique hole) with the center line of 11 thickness direction of ring anchor ontology,
The anchor hole of twocouese both can be oblique hole simultaneously, can also simultaneously be parallel hole, can be oblique hole with a direction, another
Direction is parallel hole, as long as both direction is non-interference in tensioning phase.
Unidirectional anchor hole will be symmetrically distributed in as far as possible on the ring anchor ontology 11, the inclined direction including oblique hole
Also symmetrical, ring anchor body uniform force could be made in this way, the pulling force of each steel strand wires could uniformly.
Further, for slanting anchor hole, on the end face a of steel strand wires traversing through end (this one end for having bellmouth),
A gradient is repaired, the inclined-plane and the slanting central axis for being anchored hole are made, it is therefore an objective to guarantee the axial symmetry of bellmouth itself,
In order to install steel strand wires ring folder.
Elastic ring folder can be arranged for clamping steel strand wires by being anchored in hole；In the end in hole, installation pressure can be also set
Head.
Due to realize two-way steel strand wires prestress application, so the present invention uses the ring anchor in cable-stayed bridge main-beam across conjunction
Hold together in section pre-stress construction, ring anchor is not fixation, and with prestressed application, ring anchor can be moved, so must be provided with ring
Anchor stretching notch provides the ionized space, while protection ring anchor.Reserved ring anchor stretching notch is also a feature of the present invention.
The structure of ring anchor stretching notch is as shown in Figure 3, Figure 4, and ring anchor stretching notch 2 is made of steel plate, and size needs root
It is determined according to ring anchor size and ring anchor amount of movement.Ring anchor stretching notch 2 by four steel plates surround a square groove 21 (it is square or it is rectangular all
Row), for accommodating ring anchor 1 in slot；Several reinforced steel bar rings 22 are welded on the surrounding outer wall of square groove 21, for reinforcing in concrete
Bonding strength, prevent notch from deforming；Square groove 21 is reserved with threading hole in steel strand wires connection side upwards, in threading outer end of hole welding
There is confinement ring 23 (see Fig. 4), steel strand wires 3 enter in notch from outside through confinement ring 23 and threading hole, connect with ring anchor 1.
As shown in figure 5, pre-buried ring anchor notch, the ring anchor 1 for putting on steel strand wires out are placed in beams of concrete beam body when construction
In ring anchor stretching notch 2, ring anchor twocouese connects steel strand wires 3, and the steel strand wires one end in each direction is connected in ring anchor 1, another
End, which is pierced by ring anchor stretching notch 2 and is connected to, have been poured in beam body；Then no matter draw either party to steel strand wires, can make
The beam body at both ends is mutually drawn close.
Of the invention special for across closure segment beams of concrete prestress system in cable-stayed bridge, construction technology and key points for operation are such as
Under, as shown in Figure 6:
Of the invention special for across closure segment beams of concrete prestress system in cable-stayed bridge, construction technology and key points for operation are such as
Under, as shown in Figure 6:
Step 1: pre-buried ring anchor stretching notch.The first pre-buried forming ring anchor tensioning as described above before prestressed girder pours
Notch, in middle bridge is closed up, for, across closure segment, no matter stretching notch setting is ok in which section beam section in two sections.
Further, for there is the closing up of multiple groups beam section arranged side by side (comprising left and right two beam section in one group), preferably exist
Notch is arranged alternately in each group beam section, citing has multiple groups beam section arranged side by side (shared as shown in fig. 7, in middle bridge is closed up
12 groups) close up jointly, as soon as requiring setting group steel strand wires (left and right twocouese) in each group of beam section, this needs to set in parallel
Multiple groups steel strand wires are set, multiple stretching notch accordingly should be also set, at this point, the 1st group of steel strand tension notch can be set in 1#
In beam section, and the 2nd group of steel strand tension notch, then it should be arranged in 2# beam section, for the 3rd group of steel strand tension notch, then set
It sets in 1# beam section, and so on, it can guarantee that the steel strand wires tie point of bridge in entire is in different section in this way, meet beam
Body Structural Design Requirement.
Step 2: prestressed pipeline.Prestress pipe is engaged in the confinement ring on the outside of ring anchor stretching notch, is answered in advance
Hydraulic piping installation is conventionally constructed, and does not do excessive limitation herein.
Step 3: pouring closure segment.Left and right two beam section of middle bridge is all poured concrete formation, wherein reserving ring anchor
The position of stretching notch and the position of prestress pipe are not poured.Notch is clogged with geotextiles when casting beams section concrete,
Prevent concrete from blocking notch.
Step 4: steel strand wires and anchorage installation.Steel strand wires are installed after closure segment pours, the two-way installation on ring anchor
Steel strand wires, can be using a direction steel strand wires as anchored end steel strand wires (not doing tensioning work), and other direction steel strand wires are as tensioning
It holds steel strand wires (doing tensioning work), for anchored end steel strand wires according to design length blanking, stretching end steel strand wires need additional increase to open
Draw active length.
When construction, first in the fixed beam (top plate rope) on the outside of closure segment beam, with ordinary connector anchorage 4 (see Fig. 7) anchor
Gu then steel strand wires pierce into steel strand wires in ring anchor stretching notch from prestress pipe；Stretching end and anchored end steel strand wires are all worn
It is intersected on ring anchor into ring anchor stretching notch, stretching end steel strand wires and anchored end steel strand wires are opposite on ring shape anchorage of the present invention
It walks, is pierced into corresponding anchor hole respectively；Then the ring anchor for putting on steel strand wires is placed in ring anchor stretching notch.
Further, before steel strand wires pierce into ring anchor, first ring anchor can be anchored in hole and be inserted in intermediate plate, then by stretching end
Steel strand wires are first inserted in ring anchor, then anchored end steel strand wires are reversely inserted in ring anchor, finally that intermediate plate is urgent, complete anchorage installation, such as
Shown in Fig. 5.
Ring anchor installation site can increase further along certain surplus capacity (see Fig. 5), surplus capacity according to the anchorage amount of movement L estimated
Consider that about 10-15cm is substantially met by 10cm or so.Ring anchor measurement amount of movement theoretically can be considered stretching for fixing end steel strand wires
Long amount can check steel strand wires elongation by measurement ring anchor amount of movement.
Step 5: tensioner is installed.Limiter 5, deflector 6, adapter 7, extending 8,9 and of jack are successively installed
Moveable anchor 10 etc. can be tensioned jack before tensioning, and jack is made to be in stress, and stretching force is no more than builder's tonnage
10%, installation diagram is as shown in Figure 8.
After stretching end steel strand wires are pierced by ring anchor, limiter 5, deflector 6, adapter 7, extending 8, very heavy is sequentially passed through
Top 9 and moveable anchor 10, then force can tense steel strand wires on jack.
These tools such as limiter 5, deflector 6, adapter 7, extending 8, jack 9 and moveable anchor 10 are only used for applying
Prestressing force, these tools will all remove after prestress application is complete.
Further, to avoid installation limitation of the ring anchor stretching notch to these above-mentioned tools, (notch size has after all
Limit), steel strand wires are pulled out notch using deflector 6 and apply prestressing force by the present invention.As shown in figure 8, the deflector 6 is a band
There is the threading apparatus of certain curvature, it is connected between limiter 5 and connector 7, it is therefore an objective to which steel strand wires are guided to from notch
Outside.
Step 6: prestressing force implements and control.
Using on the basis of ring shape anchorage provided by the invention steel strand tension control use dual control technique, be stretching force and
Elongation dual control, wherein elongation needs to control the elongation (Lm) of anchored end steel strand wires, is also (the intermediate plate contracting of the amount of movement of anchorage
Input is due to smaller negligible)；Additionally need control stretching end steel strand wires elongation (Lz).The elongation of anchored end steel strand wires
(Lm) it can be recorded and be calculated by directly measuring the amount of movement of anchorage, stretching end steel strand wires elongation (Lz) can pass through
Measure the overhang (Ld) of very heavy top steel strand wires indirectly to calculate, above-mentioned several amounts are calculated by following expression:
Ld=Lm+Lz
According to theoretical elongation calculation formula, the elongation and stretching force of every beam steel strand wires are linear relationship.It can use
Linear regression analysis is for statistical analysis to elongation, and calculates practical elongation by equation of linear regression, as shown in Figure 9.
Tension tool is just when filling, and jack has been stretched to the 10% of builder's tonnage, and when practical operation can be respectively in tensioning
Power measures elongation when being 20%, 40%, 60%, 80% and the 100% of builder's tonnage, lotus is held 2 minutes, then according to 5 points
Data be calculated equation of linear regression Y=aX+b, Y value 0 and when 100%, X value is respectively L0 and L6, then practical elongation
Amount is △ L=L6-L0.Elongation when can predict 100% when being stretched to control force 80%, and if design elongation have compared with
Big deviation then can stop tensioning and analyze deviation, search analysis reason and carry out tensioning again later, take to remedy and arrange
It applies, reduces the probability for tensioning quality accident occur.
Previous scene tensioning can calculate elongation according to simple calculation formula, if using the statistics of linear regression
Method analyzes elongation, so that lengthening variable work complicates, is not easy scene and calculates control, can be using intelligent work
Tool installation software for calculation, so that calculating becomes extremely simple.
Step 7: pouring ring anchor notch and prestress pipe.Prestress application finishes, and removes tension tool, pours ring anchor
Notch and pipeline pneumatic mortar, beam body are performed integrally.
The present invention meets the general technical specification of CCTG France in prestress engineering construction quality, raw material meet method mark NF and
European Union's EN standard.
Specific embodiment:
In the Congo's (cloth) Bradley bavin, main road cable-stayed bridge, project are located at (cloth) Brazzaville city, the Congo to the application of construction method along the river
Along the river main road, main bridge are cable-stayed bridge.Cable-stayed bridge main-beam uses the bilateral girder of concrete π type, and it is 550m that girder part, which is located at radius,
Circular curve on, the long 545m of girder, main span across footpath be 285m；Girder uses C55 concrete, and girder center deck-molding 2.3m, bridge is wide
Two-way 2.5% horizontal slope is arranged in 22.0m, deck profile grade 2%, top surface.Full-bridge is arranged in 2 end bay closure segments and 1 altogether across closing up
Section, closing up segment length is 2m.
Full-bridge longitudinal prestressing steel strand wires are all made of connector and are attached, and two end bay closure segments use traditional tooth plate
Prestress anchoraging mode, and in completely new ring anchor anchor patterns of the present invention are used across closure segment, construct according to the method described above.This
Engineering method takes completely new prestress anchoraging form, accelerates construction speed, reduces construction risk, obtains in this project huge
Big success.
Claims (3)
1. a kind of cable-stayed bridge prestressed concrete beam ring anchor construction method, closes up, feature applied to span in cable-stayed bridge main-beam
It is, includes the following steps:
Step 1: pre-buried ring anchor stretching notch, reserves stretching notch before pouring in girder across left and right two beam sections either segment；
Step 2: prestressed pipeline, reserves the prestressing force of steel strand wires installation before pouring in girder across left and right two beam section
Pipeline；
Step 3: pouring in girder across left and right two beam section, the position of ring anchor stretching notch and the position of prestress pipe are reserved
It is not poured；
Step 4: installation steel strand wires and anchorage, after being poured in girder across left and right two beam section, the two-way installation on ring anchor
Steel strand wires, twocouese steel strand wires one end are fixed respectively, and the other end, on ring anchor, is walked in opposite directions in ring anchor stretching notch centre-exchange-meeting,
It is pierced by length in reserve after ring anchor, a direction steel strand wires are twisted as anchored end steel strand wires, other direction steel strand wires as stretching end steel
Line；
The ring anchor is free in the ring anchor stretching notch；
Step 5: tensioner is installed, includes deflector in the tension tool, stretching end steel strand wires are drawn into the ring anchor
Kerve mouth；
Step 6: prestressing force implements and control；
Step 7: prestress application finishes, tension tool is removed, pours ring anchor stretching notch, pipeline pneumatic mortar, beam body is integrally complete
At；
The ring anchor stretching notch surrounds a square groove by four steel plates, upper opening, dissociates in slot and places the ring anchor；It is described
Reinforced steel bar ring is welded on the surrounding outer wall of square groove；The square groove is reserved with threading hole in steel strand wires connection side upwards, in threading hole
Outer end is welded with steel strand wires confinement ring；
When construction, first in the fixed beam on the outside of closure segment beam, steel strand wires are anchored with ordinary connector anchorage, then by steel strand wires
It is pierced into ring anchor stretching notch from prestress pipe；
Before steel strand wires pierce into ring anchor, first it is anchored in hole in ring anchor and is inserted in intermediate plate, stretching end steel strand wires are first then inserted in ring
Anchor, then anchored end steel strand wires are reversely inserted in ring anchor, it is finally that intermediate plate is urgent；
The anchored end steel strand wires reserve tensioning active length according to design length blanking, the stretching end steel strand wires；
The ring anchor installation site increases certain surplus capacity according to the anchorage amount of movement estimated further along, and the surplus capacity presses 10-
15cm is reserved；
When applying prestressing force, steel strand tension uses dual control technique, is stretching force and elongation dual control, wherein elongation needs to control
The elongation Lm and stretching end steel strand wires elongation Lz of anchored end steel strand wires processed, the overhang Ld of very heavy top steel strand wires is as the following formula
It calculates:
Ld=Lm+Lz
Using the linear relationship of linear regression analysis elongation and stretching force；
The ring anchor, including a ring anchor ontology are provided on ring anchor ontology and are anchored hole, right on the anchor Kong Huan anchor ontology
Claim twocouese to open up, is worn in the anchor hole and connect the steel strand wires；
The anchor hole in one direction is oblique hole, and the anchor hole in another direction is parallel hole；Alternatively, double
The anchor hole on direction is parallel hole；Again alternatively, the anchor hole on twocouese is oblique hole；
The anchor hole in all directions at least there are two, around the center symmetric setting of the ring anchor ontology.
2. cable-stayed bridge prestressed concrete beam ring anchor construction method according to claim 1, which is characterized in that for side by side
It is provided in the girder of the left and right beam section of multiple groups across the ring anchor stretching notch is disposed alternately in the left and right beam section of each group, that is,
If the 1st ring anchor stretching notch is arranged in the left beam section of the 1st group of beam, the 2nd ring anchor stretching notch is arranged in the 2nd group of beam
Right beam section on, the 3rd ring anchor stretching notch is arranged in the left beam section of the 3rd group of beam, and so on.
3. cable-stayed bridge prestressed concrete beam ring anchor construction method according to claim 1, which is characterized in that in tensioning work
Tool just dress when jack tension to the 10% of builder's tonnage, when practical operation 20% that stretching force is builder's tonnage, 40%,
60%, 80%, 100% when measure elongation, hold lotus respectively 2 minutes.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710924553 | 2017-10-01 | ||
| CN201710924553X | 2017-10-01 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107938517A CN107938517A (en) | 2018-04-20 |
| CN107938517B true CN107938517B (en) | 2019-09-24 |
Family
ID=61929370
Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721559527.3U Active CN207452739U (en) | 2017-10-01 | 2017-11-21 | A kind of cable-stayed bridge beams of concrete mid-span closure segment pre-stress system |
| CN201711162764.0A Active CN107938517B (en) | 2017-10-01 | 2017-11-21 | A kind of cable-stayed bridge prestressed concrete beam ring anchor construction method |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201721559527.3U Active CN207452739U (en) | 2017-10-01 | 2017-11-21 | A kind of cable-stayed bridge beams of concrete mid-span closure segment pre-stress system |
Country Status (1)
| Country | Link |
|---|---|
| CN (2) | CN207452739U (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112523093B (en) * | 2020-11-24 | 2022-03-18 | 中铁大桥局集团有限公司 | Prestressed lengthening device and method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201165726Y (en) * | 2008-01-11 | 2008-12-17 | 河南红桥锚机有限公司 | Ring anchor |
| KR101387595B1 (en) * | 2012-11-29 | 2014-04-23 | 지에스건설 주식회사 | Tention typed multi-span cable-stayed bridge construction method using hybrid decksegment |
| CN103882812A (en) * | 2014-04-03 | 2014-06-25 | 重庆建工桥梁工程有限责任公司 | Construction method for midspan main beams of cable-stayed bridge |
| CN104775365A (en) * | 2015-02-28 | 2015-07-15 | 张跃平 | Cable-stayed bridge construction method |
| CN106351128A (en) * | 2016-11-28 | 2017-01-25 | 中交路桥华南工程有限公司 | Construction method of cable stayed bridge side span main beam |
-
2017
- 2017-11-21 CN CN201721559527.3U patent/CN207452739U/en active Active
- 2017-11-21 CN CN201711162764.0A patent/CN107938517B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201165726Y (en) * | 2008-01-11 | 2008-12-17 | 河南红桥锚机有限公司 | Ring anchor |
| KR101387595B1 (en) * | 2012-11-29 | 2014-04-23 | 지에스건설 주식회사 | Tention typed multi-span cable-stayed bridge construction method using hybrid decksegment |
| CN103882812A (en) * | 2014-04-03 | 2014-06-25 | 重庆建工桥梁工程有限责任公司 | Construction method for midspan main beams of cable-stayed bridge |
| CN104775365A (en) * | 2015-02-28 | 2015-07-15 | 张跃平 | Cable-stayed bridge construction method |
| CN106351128A (en) * | 2016-11-28 | 2017-01-25 | 中交路桥华南工程有限公司 | Construction method of cable stayed bridge side span main beam |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107938517A (en) | 2018-04-20 |
| CN207452739U (en) | 2018-06-05 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN104976424B (en) | Anchor cable construction method for rectangular top pipe joint connecting and strengthening | |
| KR20110111907A (en) | Saddle assembly | |
| CN107816170A (en) | A kind of great diameter and long steel reinforcement cage and its construction method | |
| CN109281250A (en) | Deck type external tendon multiple-arch bridge arch ring linearly with prestress control construction method | |
| CN105568856B (en) | A kind of dilute cable stayed-cable bridge Suo Liang method for synchronously constructing | |
| CN212025936U (en) | Equipment for mounting continuous steel strand stay cable at tower end of cable-stayed bridge | |
| CN109057148A (en) | Ultra-high performance concrete is without regular reinforcement Prestressed U type beam and its construction method | |
| CN107938517B (en) | A kind of cable-stayed bridge prestressed concrete beam ring anchor construction method | |
| CN106088757B (en) | A kind of construction method for ring beam in the middle part of ultra-large silo and top barrel | |
| CN111236072A (en) | Continuous beam ultra-long bundle steel strand pulling construction method | |
| CN103938871B (en) | A kind of construction method adopting the steel core concrete column bonded prestress frame beam structure of reinforced concrete ring beam joint | |
| CN106087759B (en) | A kind of threading method of prestressed strand threader and prestressed strand | |
| CN215574327U (en) | Precast beam prestress wire detection device | |
| CN107034785A (en) | Rope construction method is changed in a kind of interchangeable anchorage prestress anchoraging device and its installation | |
| CN108316150A (en) | The construction system and construction method of Cable stayed Bridge Main Tower and steel anchor beam | |
| CN102619338B (en) | Construction method for pre-stressed tendon of ultra-long ring beam | |
| CN107762238B (en) | A kind of king-post prestressed strand lifting position control method | |
| CN104005340B (en) | Continuous beam elongated prestressing tendon lashing construction method | |
| CN206157586U (en) | Prestressed anchorage device for road bridge construction | |
| CN106149541B (en) | Prestressed tensioning prefabricated box type bridge and construction method | |
| CN113235458B (en) | Arch bridge cantilever construction system and method | |
| CN202509790U (en) | Reinforcing structure of structure pool | |
| CN101476295A (en) | Advanced hole-passing construction method for up-going movable formwork bridge fabrication machine | |
| CN108316162A (en) | A kind of pre-pressing system installation method of bridge hanging basket cantilever construction | |
| CN210086065U (en) | Open storehouse reinforcement structure suitable for continuous box girder bridge longitudinal prestressing force pipeline |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |