CN207452739U - A kind of cable-stayed bridge beams of concrete mid-span closure segment pre-stress system - Google Patents
A kind of cable-stayed bridge beams of concrete mid-span closure segment pre-stress system Download PDFInfo
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- CN207452739U CN207452739U CN201721559527.3U CN201721559527U CN207452739U CN 207452739 U CN207452739 U CN 207452739U CN 201721559527 U CN201721559527 U CN 201721559527U CN 207452739 U CN207452739 U CN 207452739U
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- ring
- steel strand
- strand wires
- anchor
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- 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
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- 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
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- 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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- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Bridges Or Land Bridges (AREA)
Abstract
The utility model discloses a kind of cable-stayed bridge beams of concrete mid-span closure segment pre-stress system, it is characterised in that：Including the steel strand wires (1) being embedded in described two beam sections of mid-span closure segment and the ring shape anchorage (2) for connecting the steel strand wires (1) one end jointly, the ordinary connector anchorage (3) for fixing the steel strand wires (1) other end；Wherein, the ring shape anchorage (2) includes a ring anchor body (21), be provided with penetrating anchor hole (22) on ring anchor body (21), it is described be anchored twocouese in hole (22) and wear connect the steel strand wires (1)；The ring shape anchorage (2) is movably placed in a ring anchor stretching notch (4).The utility model connects steel strand wires using two-way ring anchor, implements two dimension prestressing, reduces construction risk, reduce the risk of prestressed failure, improve the durability of structure.
Description
Technical field
The utility model is related to a kind of cable-stayed bridge prestressed Construction Technologies, and in particular to a kind of cable-stayed bridge beams of concrete mid-span
Closure segment pre-stress system.
Background technology
The prestressed application of beams of concrete, in the latter stage fifties, China is for the first time using bar reinforcement electrothermal way to circular reservoir
(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.China's Zhujiang Cement life clinker warehouse successfully uses large-tonnage steel strand bundle for the first time.Later,
Have to bond and be widely used in silo, cistern, sewage digesting pool, nuclear plant safety with soap-free emulsion polymeization annular post-tensioned pre-stressed technology
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 generally use concrete box girder is as girder, and concrete box girder is in addition to 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 and mid-span closure segment generally use
Steel strand wires apply prestressing force and close up, and ordinary connector connection may be employed in closure segment prestressing force, and mid-span closure segment is generally adopted at present
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 same anchorage, leaned in opposite directions
Hold together.
Utility model content
For this purpose, the utility model puts forth effort on the deficiency for solving the above-mentioned prior art, provide in a kind of cable-stayed bridge beams of concrete
Across closure segment pre-stress system can reduce the risk of beam body cracking and prestressed failure using the pre-stress system, improve beam
Body structure durability.
Technical solution adopted in the utility model is as follows：A kind of cable-stayed bridge beams of concrete mid-span closure segment prestressing force system
System, it is characterised in that：It is including the steel strand wires being embedded in described two beam sections of mid-span closure segment and described for connecting jointly
The ring shape anchorage of steel strand wires one end, the ordinary connector anchorage for fixing the steel strand wires other end；
Wherein, the ring shape anchorage includes a ring anchor body, and penetrating anchor hole, the anchor are provided on ring anchor body
It connects twocouese in hole and wears and connect the steel strand wires；
The ring shape anchorage is movably placed in a ring anchor stretching notch.
Preferably, the bellmouth for being anchored hole and being made of one section of straight hole section and one section of taper hole section, and in the ring anchor
Twocouese opens up on body.
The anchor hole in all directions, around the center symmetric setting of the ring anchor body.
The anchor hole number in all directions is consistent.
Preferably, the ring anchor stretching notch surrounds a square groove, upper opening by steel plate, and the ring shape anchorage activity is put
In the square groove；Reinforced steel bar ring is welded on the surrounding outer wall of the square groove；The square groove is reserved upwards in steel strand wires connection side
There is threading hole, steel strand wires confinement ring is welded in threading outer end of hole.
The ring anchor stretching notch is embedded in any one of described two beam sections of mid-span closure segment.
Preferably, when there is multigroup mid-span closure segment side by side, the ring anchor stretching notch is disposed alternately at each mid-span and closes up
In the beam section of section.
The utility model uses ring anchor prestress anchoraging mode in prestressed concrete cable-stayed bridge construction, instead of tradition
Closure segment tooth plate anchorage style, reduce beam body cracking and prestressed failure risk, improve girder construction durability.It avoids
The construction of tooth block and the processing of tooth block abnormal formwork, reduce difficulty of construction.Tensioning is easy, directly can carry out tensioning work in bridge floor
Make, reduce the operation difficulty and construction risk in beam bottom application work.
Description of the drawings
Fig. 1 is layout drawing of the steel strand prestress system provided by the utility model in cable-stayed bridge main-beam mid-span closure segment；
Fig. 2 is that schematic diagram is seen in the side of ring shape anchorage；
Fig. 3 is the A-A sectional views in Fig. 2；
Fig. 4 is ring anchor stretching notch, ring shape anchorage, the scheme of installation of steel strand wires；
Fig. 5 is the schematic top plan view of ring anchor stretching notch；
Fig. 6 is the schematic side view of ring anchor stretching notch.
Specific embodiment
The utility model is described in detail with reference to the accompanying drawings and examples.
Cable-stayed bridge beams of concrete mid-span closure segment pre-stress system provided by the utility model, it is pre- suitable for beams of concrete
It buries steel strand wires and applies prestressed situation, entire pre-stress system includes steel strand wires pre-buried in mid-span closure segment and for leading
The anchorage of drawing steel stranded wire.
As shown in Figure 1, in the 1# beam sections and 2# beam sections of mid-span closure segment, steel strand wires 1, two sections of steel strand wires 1 are all embedded with
This one end to connect is connected by a special ring shape anchorage 2, and the one end being away from each other is each via an ordinary connector anchor
Tool 3 is connected on end bay beam.
A kind of special new ring shape anchorage 2 of the utility model, as shown in Figure 2 and Figure 3, ring shape anchorage 2 include a ring anchor body
21, it is provided on ring anchor body 21 and is anchored hole 22, the whole thickness side for being anchored hole 22 and running through the ring anchor body 21
To.
The bellmouth that hole 22 can be made of one section of straight hole section 221 and one section of taper hole section 222 is anchored, it further, can
Being anchored hole both ends, technique reaming 223 is set.Straight hole section 221 and 222 natural sparse model of taper hole section, the taper of taper hole section 222 is 1:
10~1:30, preferably 1:20, small end is connected in straight hole section 221.In general, entirely it is being anchored on hole length, 221 He of straight hole section
Taper hole section 222 about respectively accounts for half length or taper hole section is less than straight hole section.
It can also be an isodiametric cylindrical hole to be anchored hole 22.
This ring shape anchorage provided by the utility model, feature are exactly the ring anchor anchor in prestress wire anchor
Connection of the tool available for two-way steel strand wires, so it is penetrating on ring anchor body 21 to be anchored hole 22, opening direction is also both sides
To, i.e., steel strand wires can both be penetrated from the front of ring anchor, can also be penetrated from the back side of ring anchor (front, the back side refer both to thickness
Direction), the steel strand wires of both direction mutually can draw close two closure segments by the prestressing force of active force application each other.So for ring anchor
On anchor hole 22, should have twocouese arrangement, wherein taper hole section 222 should be opened in the steel strand wires traversing through end on anchorage, be pierced by
End, taper hole section 222 is gradual reaming shape, until end face.
Twocouese can set multiple anchor holes 22 on ring anchor body 21, such as in one embodiment, can set two-way 8
Hole is anchored as a, unidirectional 4.It is preferred that the anchor hole number of twocouese is preferably consistent, also, the anchor in each direction
Connecing hole will be centrosymmetrically arranged compared with ring anchor body 21.
For the blowing angle in hole 22 is anchored, the axis for being anchored hole 22 can be with the center of 21 thickness direction of ring anchor body
Line is parallel (be known as parallel hole), can also (being known as oblique hole) angled with the center line of 21 thickness direction of ring anchor body,
The anchor hole of twocouese both can be oblique hole simultaneously, can also be parallel hole simultaneously, 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 on the ring anchor body 21 as far as possible, the inclined direction including oblique hole
Also it is symmetrical, it could so cause ring anchor body uniform force, the pulling force of each steel strand wires could uniformly.
It further, can be in the end face a of steel strand wires traversing through end (this one end for having bellmouth) for slanting anchor hole
On, a gradient is repaired, makes the central axis on the inclined-plane and slanting anchor hole, it is therefore an objective to ensure the axial symmetry of bellmouth itself
Property, in order to install steel strand wires ring folder.
Elastic ring folder can also be set for clamping steel strand wires by being anchored in hole；In the end in hole installation can also be set to press
Head.
Due to realize two-way steel strand wires prestress application, so the utility model uses the ring shape anchorage in cable-stayed bridge master
In beam mid-span closure segment pre-stress construction, ring anchor is not fixed, and with prestressed application, ring anchor can move, so must
Ring anchor stretching notch 4 must be set to provide the ionized space, while protection ring anchor.It is also that this practicality is new to set ring anchor stretching notch 4
One feature of type.
Ring anchor stretching notch 4 is embedded in can in which section of mid-span closure segment.Further, for being arranged side by side
The situation of multigroup closure segment is preferably arranged alternately ring anchor stretching notch 4 on each group closure segment, as shown in Figure 1, the 1st group of ring
Anchor stretching notch can be arranged in 1# beam sections, and the 2nd group of ring anchor stretching notch should be then arranged in 2# beam sections, the 3rd group of ring anchor
Stretching notch is arranged on again in 1# beam sections, and so on, it can so ensure that the steel strand wires tie point of entire middle bridge is in not
Same section meets girder construction design requirement.
Ring anchor stretching notch 4 and steel strand wires 1, the link position relation of ring shape anchorage 2 are as shown in figure 4, self structure such as figure
5th, shown in Fig. 6, ring anchor stretching notch 4 is made of steel plate, and size needs are determined according to ring anchor size and ring anchor amount of movement.Ring anchor
Stretching notch 4 surrounds a square groove 41 (square or rectangular all right) by four steel plates, is used to accommodate ring shape anchorage 2 in slot；Square groove 41
Surrounding outer wall on weld several reinforced steel bar rings 42, for strengthening bonding strength in concrete, prevent notch from deforming；Square groove
41 are reserved with threading hole upwards in steel strand wires connection side, and confinement ring 43 (as shown in Figure 4), steel strand wires are welded in threading outer end of hole
1 enters from outside through confinement ring 43 and threading hole in notch, is connected with anchorage.
Pre-buried ring anchor stretching notch 4, the ring shape anchorage 2 for putting on steel strand wires are placed in ring anchor in beams of concrete beam body during construction
In stretching notch 4,2 twocouese of ring shape anchorage connection steel strand wires 1, the steel strand wires one end in each direction is connected on ring shape anchorage 2,
The other end is pierced by ring anchor stretching notch and is connected in the beam body poured；Then no matter draw either party to steel strand wires, all
The beam body at both ends can be made mutually to draw close.
The utility model is special to be used for cable-stayed bridge mid-span closure segment beams of concrete prestress system, and construction technology main points are as follows：
1st, pre-buried ring anchor stretching notch.The first pre-buried ring anchor stretching notch as described above before prestressed girder pours.
2nd, prestressed pipeline.Prestress pipe is engaged in the confinement ring on the outside of ring anchor stretching notch, prestressed pipe
Road installation is conventionally constructed, and does not do excessive limitation herein.
3rd, middle bridge closure segment is poured.Middle two beam section of bridge is all poured into a mould into concrete formation, wherein reserving ring anchor tensioning
The position of notch and the position of prestress pipe not pour into a mould.Notch is clogged with geotextiles during casting beams section concrete, is prevented
Concrete blocks notch.
4th, steel strand wires and anchorage installation.It is two-way on ring shape anchorage to wear steel strand wires, it can be using a direction steel strand wires as anchor
Fixed end steel strand wires (do not do tensioning work), and other direction steel strand wires are as stretching end steel strand wires (doing tensioning work), anchored end steel
For twisted wire according to design length blanking, stretching end steel strand wires need additional increase tensioning active length.
During 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 is pierced into from prestress pipe in ring anchor stretching notch；Stretching end and anchored end steel strand wires are all worn into ring anchor stretching notch
It crosses on ring shape anchorage, stretching end steel strand wires and anchored end steel strand wires are walked in opposite directions on ring shape anchorage, are pierced into respectively corresponding
It is anchored in hole；Then the ring anchor for putting on steel strand wires is positioned in ring anchor stretching notch.
Ring shape anchorage installation site can increase certain surplus capacity (see Fig. 4) further along according to the anchorage amount of movement L estimated, rich
Surplus is substantially met by 10cm or so consideration, about 10-15cm.Ring anchor measurement amount of movement theoretically can be considered fixing end steel strand wires
Elongation, steel strand wires elongation can be checked by measuring ring anchor amount of movement.
5th, tensioning.After stretching end steel strand wires are pierced by ring anchor, tensioner is sequentially passed through, force can tense steel strand wires.
It is that stretching force and elongation are double using the steel strand tension on the basis of ring shape anchorage provided by the utility model using dual control technique
Control, wherein elongation need control anchored end steel strand wires elongation (Lm), also for anchorage amount of movement (intermediate plate indent due to
It is smaller negligible)；Additionally need control stretching end steel strand wires elongation (Lz).The elongation (Lm) of anchored end steel strand wires can lead to
The amount of movement for crossing directly measurement anchorage is recorded and calculated, and stretching end steel strand wires elongation (Lz) can be by measuring indirectly
The overhangs (Ld) of very heavy top steel strand wires calculates, and above-mentioned several amounts are calculated by following expression：
Ld=Lm+Lz
According to theoretical elongation calculation formula, elongation and stretching force per beam steel strand wires are linear relationship.It may be employed
Linear regression analysis carries out elongation statistical analysis, and calculates actual elongation by equation of linear regression.
Claims (7)
1. a kind of cable-stayed bridge beams of concrete mid-span closure segment pre-stress system, it is characterised in that：It is closed including being embedded in the mid-span
The steel strand wires (1) that hold together in two beam sections of section and for connecting the ring shape anchorage (2) of the steel strand wires (1) one end jointly, being used for
The ordinary connector anchorage (3) of fixed steel strand wires (1) other end；
Wherein, the ring shape anchorage (2) includes a ring anchor body (21), and penetrating anchor hole is provided on ring anchor body (21)
(22), twocouese is worn and connects the steel strand wires (1) in anchor hole (22)；
The ring shape anchorage (2) is movably placed in a ring anchor stretching notch (4).
2. cable-stayed bridge beams of concrete mid-span closure segment pre-stress system according to claim 1, it is characterised in that：The anchor
The bellmouth that hole (22) is made of one section of straight hole section (221) and one section of taper hole section (222) is connect, and in the ring anchor body (21)
Upper twocouese opens up.
3. cable-stayed bridge beams of concrete mid-span closure segment pre-stress system according to claim 1 or 2, it is characterised in that：Respectively
The anchor hole (22) on direction, around the center symmetric setting of the ring anchor body (21).
4. cable-stayed bridge beams of concrete mid-span closure segment pre-stress system according to claim 1 or 2, it is characterised in that：Respectively
Anchor hole (22) quantity on direction is consistent.
5. cable-stayed bridge beams of concrete mid-span closure segment pre-stress system according to claim 1, it is characterised in that：The ring
Anchor stretching notch (4) surrounds a square groove, upper opening by steel plate, and the ring shape anchorage (2) is movably placed in the square groove；Institute
It states and is welded with reinforced steel bar ring on the surrounding outer wall of square groove；The square groove is reserved with threading hole upwards in steel strand wires connection side, is threading
Outer end of hole is welded with steel strand wires confinement ring.
6. cable-stayed bridge beams of concrete mid-span closure segment pre-stress system according to claim 1 or 5, it is characterised in that：Institute
Ring anchor stretching notch (4) is stated to be embedded in any one of described two beam sections of mid-span closure segment.
7. cable-stayed bridge beams of concrete mid-span closure segment pre-stress system according to claim 6, it is characterised in that：When side by side
When having multigroup mid-span closure segment, the ring anchor stretching notch (4) is disposed alternately in the beam section of each mid-span closure segment.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710924553 | 2017-10-01 | ||
| CN201710924553X | 2017-10-01 |
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| CN207452739U true CN207452739U (en) | 2018-06-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201711162764.0A Active CN107938517B (en) | 2017-10-01 | 2017-11-21 | A kind of cable-stayed bridge prestressed concrete beam ring anchor construction method |
| 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 |
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| CN201711162764.0A Active CN107938517B (en) | 2017-10-01 | 2017-11-21 | A kind of cable-stayed bridge prestressed concrete beam ring anchor construction method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112523093A (en) * | 2020-11-24 | 2021-03-19 | 中铁大桥局集团有限公司 | Prestressed lengthening device and method |
Family Cites Families (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 |
| CN103882812B (en) * | 2014-04-03 | 2016-01-20 | 重庆建工桥梁工程有限责任公司 | Across the construction method of girder in stayed-cable bridge |
| CN104775365B (en) * | 2015-02-28 | 2017-04-05 | 张跃平 | A kind of construction method of cable-stayed bridge |
| CN106351128B (en) * | 2016-11-28 | 2019-04-09 | 中交路桥华南工程有限公司 | The construction method of cable-stayed bridge end bay girder |
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2017
- 2017-11-21 CN CN201711162764.0A patent/CN107938517B/en active Active
- 2017-11-21 CN CN201721559527.3U patent/CN207452739U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112523093A (en) * | 2020-11-24 | 2021-03-19 | 中铁大桥局集团有限公司 | Prestressed lengthening device and method |
| CN112523093B (en) * | 2020-11-24 | 2022-03-18 | 中铁大桥局集团有限公司 | Prestressed lengthening device and method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN107938517A (en) | 2018-04-20 |
| CN107938517B (en) | 2019-09-24 |
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