CN108103946A - Tensioning equipment applied to the construction of small space - Google Patents
Tensioning equipment applied to the construction of small space Download PDFInfo
- Publication number
- CN108103946A CN108103946A CN201711392574.8A CN201711392574A CN108103946A CN 108103946 A CN108103946 A CN 108103946A CN 201711392574 A CN201711392574 A CN 201711392574A CN 108103946 A CN108103946 A CN 108103946A
- Authority
- CN
- China
- Prior art keywords
- construction
- box beam
- concrete box
- small space
- installation set
- 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.)
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Classifications
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D21/00—Methods or apparatus specially adapted for erecting or assembling bridges
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
- E01D2/04—Bridges characterised by the cross-section of their bearing spanning structure of the box-girder type
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
- E01D2101/26—Concrete reinforced
- E01D2101/28—Concrete reinforced prestressed
Abstract
The present invention is applied to the tensioning equipment of small space construction, belongs to pre-stress construction field, it is therefore an objective to adapt to the small space tensioning operation of concrete box beam both ends installation steel box-girder, increase economic efficiency.Including respectively in the both ends stretching notch of concrete box beam, the fastening type jack in stretching notch and the instrument anchor assemblies being installed on inside fastening type jack；The stretching notch is radially-inwardly recessed along concrete box beam, and the upper surface of concrete box beam is penetrated through along concrete box beam short transverse.The present invention, by the way that instrument anchor assemblies are built in fastening type jack, effectively save the required space of tensioning, it is particularly suitable in narrow space tensioning operation, is the design conditions of steel box girder for PRC structure both ends, pre-stress construction is no longer limited by steel box-girder end steel plate, it can priority sequence of construction or synchronous construction determines according to actual conditions, it shortens the duration, saved cost, while the length in reserve of steel strand wires is also reduced, remarkable in economical benefits.
Description
Technical field
The invention belongs to pre-stress construction field, the tensioning equipment particularly constructed applied to small space.
Background technology
Steel box-girder is generally produced using prefabrication, and the scene of then transporting is installed using equipment hoisting, in installation process
Component does not allow to be cut again；Cast-in-place concrete box beam carries out model sheetinstallat, reinforcing bar binding using stent is set up on the spot on stent
And concrete placings work, finally in the reserved stretching notch progress pre-stress construction in concrete beam-ends head position.Work as prestress concrete box girder
One or both ends when be all steel box-girder, the tensioning process of the connection concrete box beam just seems particularly critical.At present, concrete case
Girder tensioning is completed using conventional centre-hole jack, there is following drawback：
1st, first construction Cast-in-place concrete box beam, completion to be tensioned install steel box-girder, i.e. conventional construction technique again afterwards.It is so unfavorable
In quickly propelling for overall construction speed, there may be situations such as the work holdup, the wasting of resources, virtually add cost；
The 2nd, steel box-girder is first installed, but the steel plate after installing at the diaphragm plate of girder steel end must first be cut away, and wait to open
Pull into afterwards that welded closure, this way are unfavorable for girder steel overall structure quality again.
The 3rd, steel box-girder is first installed, linked up with designing unit, by the box girder pre-stressed steel strand tension end change of concrete at top plate,
Although this change had, the stress at bearing is changed, design original intention has been run counter to, has been unfavorable for bridge security.
The 4th, steel box-girder is first installed, concrete box beam uses one-end tension.The condition that such case is applicable in is harsh, moreover less than 25m
Straight-line prestressed structure it is inherently fewer, institute have very much limitation in this way.
The content of the invention
The technical problems to be solved by the invention are to provide a kind of box girder pre-stressed construction jack of concrete, to adapt to concrete box beam
The small space tensioning operation of steel box-girder is installed at both ends, is saved the duration, is increased economic efficiency.
The technical solution adopted by the present invention is：Applied to the tensioning equipment of small space construction, including respectively in concrete box beam
It is very heavy that the stretching notch set at steel strand wires, the inner blocking type for being installed on concrete box beam end in stretching notch is distributed in both ends
Push up and be installed on the instrument anchor assemblies for being used to clamp steel strand wires inside fastening type jack；The stretching notch is along concrete box beam footpath
To being recessed inwardly, and along the top surface of concrete box beam short transverse perforation concrete box beam.
Further, the fastening type jack includes cylinder body, piston and installation set；The cylinder body is connected with installation set
It connects, the piston is arranged between cylinder body and installation set, and is slidably connected with cylinder body and installation set；The front end installation of piston
There is the limiting plate being integrally fixed with piston；
The instrument anchor assemblies include the moveable anchor body being installed in installation set；It is provided on moveable anchor body along it
Axially through the tooling hole of moveable anchor body, the tooling hole axially includes the cylinder of intermediate taper stage casing, front end along it
Leading portion and the cylindrical back segment of rear end；The tool clamping piece being adapted to it in taper stage casing is installed, is installed in cylindrical back segment
There is absent-mindedness to cover, described absent-mindedness set one end abuts against limiting plate, and the other end abuts against tool clamping piece；Spring is installed in cylindrical leading portion,
The pressing plate being connected with installation set is provided in the front end of moveable anchor body, the spring one end abuts against pressing plate, and the other end abuts against
Tool clamping piece.
Further, supporting sleeve is provided in installation set, described supporting sleeve one end is clamped with installation set, the other end and work
Has the clamping of anchor body；The moveable anchor body and the other end of supporting sleeve clamping are clamped with installation set.
Further, the pressing plate is connected between moveable anchor body and supporting sleeve.
Further, the holding set being adapted to it is provided in cylindrical back segment, the spring and pressing plate are set in
Keep set periphery.
Further, threading hole passed through for steel strand wires axially through limiting plate along it is provided on limiting plate.
Further, the threading hole and tooling hole are coaxial.
The beneficial effects of the invention are as follows：By setting stretching notch at the both ends of concrete box beam, stretching notch is along concrete box beam footpath
To being recessed inwardly, and along the upper surface of concrete box beam short transverse perforation concrete box beam, space is provided for the installation of fastening type jack,
Even if carrying out steel strand tension after steel box girder construction, it can will also be put into and open in fastening type jack from stretching notch upper end
Kerve mouth；By the way that instrument anchor assemblies are built in fastening type jack, the required space of tensioning is effectively saved, is especially fitted
It closes in narrow space tensioning operation, is the design conditions of steel box girder for PRC structure both ends, pre-stress construction
No longer limited by steel box-girder end steel plate, can priority sequence of construction or synchronous construction determines according to actual conditions, shorten
Duration has saved cost, while the length in reserve of steel strand wires is also reduced, largely saved deformed bar, economical
Remarkable benefit.
Description of the drawings
Fig. 1 is schematic diagram of the present invention；
Fig. 2 is the A-A sectional views of Fig. 1；
Fig. 3 is the structure diagram of the present invention；
Fig. 4 is fastening type jack structure diagram.
In figure, concrete box beam 1, stretching notch 2, fastening type jack 3, cylinder body 31, piston 32, installation set 33, limiting plate 34,
Threading hole 341, instrument anchor assemblies 4, moveable anchor body 41, tooling hole 42, taper stage casing 421, cylindrical leading portion 422, cylinder
Back segment 423, tool clamping piece 43, absent-mindedness set 44, spring 45, pressing plate 46, holding set 47, supporting sleeve 5, steel strand wires 6.
Specific embodiment
It is as follows that the present invention is described further with reference to the accompanying drawings and examples：
Applied to the tensioning equipment of small space construction, as shown in Figure 1-Figure 3, including being distributed respectively at the both ends of concrete box beam 1
There are the stretching notch 2 set at steel strand wires 6, the fastening type jack 3 for being installed on 1 end of concrete box beam in stretching notch 2
With the instrument anchor assemblies 4 for being used to clamp steel strand wires 6 being installed on inside fastening type jack 3；The stretching notch 2 is along concrete box beam
1 is radially-inwardly recessed, and the upper surface of concrete box beam 1 is penetrated through along 1 short transverse of concrete box beam.
The present invention, by setting stretching notch 2 at the both ends of concrete box beam 1, stretching notch 2 is radially-inwardly recessed along concrete box beam 1
It falls into, and along the upper surface of 1 short transverse of concrete box beam perforation concrete box beam 1, the installation for fastening type jack 3 provides space, even if
Steel strand tension is carried out after steel box girder construction, also can will be put into tensioning in fastening type jack 3 from 2 upper end of stretching notch
Notch 2；By the way that instrument anchor assemblies 4 are built in fastening type jack 3, the required space of tensioning is effectively saved, especially
It is suitble in narrow space tensioning operation, is the design conditions of steel box girder for PRC structure both ends, prestressing force is applied
Work is no longer limited by steel box-girder end steel plate, can priority sequence of construction or synchronous construction determines according to actual conditions, contracting
The short duration has saved cost, while the length in reserve of steel strand wires is also reduced, and has largely saved deformed bar, warp
Ji remarkable benefit.
Preferably, as shown in figure 4, the fastening type jack 3 includes cylinder body 31, piston 32 and installation set 33；The cylinder
Body 31 is connected with installation set 33, and the piston 32 is arranged between cylinder body 31 and installation set 33, and with cylinder body 31 and installation set
33 sliding connections；The front end of piston 32 is equipped with the limiting plate 34 being integrally fixed with piston 32；
The instrument anchor assemblies 4 include the moveable anchor body 41 being installed in installation set 33；It is set on moveable anchor body 41
Tooling hole 42 axially through moveable anchor body 41 along it is equipped with, the tooling hole 42 axially includes intermediate taper stage casing along it
421st, the cylindrical leading portion 422 of front end and the cylindrical back segment 423 of rear end；It is equipped in taper stage casing 421 and to be adapted to it
Tool clamping piece 43 is equipped with absent-mindedness set 44 in cylindrical back segment 423, and described 44 one end of absent-mindedness set abut against limiting plate 34, the other end
Abut against tool clamping piece 43；Spring 45 is installed in cylindrical leading portion 422, is provided in the front end of moveable anchor body 41 and installation set
33 pressing plates 46 being connected, described 45 one end of spring abut against pressing plate 46, and the other end abuts against tool clamping piece 43.
Moveable anchor body 41 is installed on implementation tool anchor assemblies 4 in installation set 33 and is built in jack, in improving
The structural compactness of clip type jack 3 saves the space needed for tensioning.And by setting tooling hole on moveable anchor body 41
42, tool clamping piece 43, absent-mindedness set 44 and spring 45 are concentrated in tooling hole 42, improve the globality of moveable anchor body 41,
Convenient for the assembling of moveable anchor body 41.The limiting plate 34 being integrally fixed with piston 32 by the front end of piston 32 is installed, is led to
Limiting plate 34 and the structure in the stretching notch 2 of concrete box beam 1 are crossed, such as work anchor, work clip sheet are engaged, and realize tensioning, limit
Position plate 34 is simple in structure, and thickness is small, has further reduced the size of fastening type jack 3.
Preferably, supporting sleeve 5 is provided in installation set 33, described 5 one end of supporting sleeve is clamped with installation set 33, the other end
It is clamped with moveable anchor body 41；The moveable anchor body 41 is clamped with the other end that supporting sleeve 5 is clamped and installation set 33.
Moveable anchor body 41, supporting sleeve 5 and installation set 33 are by setting corresponding limited step to be clamped, between three
Mutually restrict, it is simple in structure, stability is high.
Preferably, the pressing plate 46 is connected between moveable anchor body 41 and supporting sleeve 5.
For support spring 45 and pressing plate 46, it is preferred that be provided with the holding set being adapted to it in cylindrical back segment 423
47, the spring 45 and pressing plate 46 are set in 47 peripheries of holding set.
Pass through for the ease of steel strand wires 6, it is preferred that use axially through limiting plate 34 along it is provided on limiting plate 34
In the threading hole 341 that steel strand wires pass through.Threading hole 341 is usually disposed as the small bellmouth in the big outer end in inner end.
It is passed through for the ease of steel strand wires 6, it is preferred that the threading hole 341 and tooling hole 42 are coaxial.
During tensioning, the stretching end of steel strand wires 6 is sequentially passed through to the threading hole 341, absent-mindedness set 44, tool clamping piece of limiting plate 34
43 cover 47 hole with holding, to the tensioning oil supply cylinder of fastening type jack 3, at this point, cylinder body 31, installation set 33 drive moveable anchor group
The end motion backward of part 4, stretches out piston 32, at this point, under the action of spring 45, tool clamping piece 43, tool clamping piece 43 clamps steel
Twisted wire 6, meanwhile, the clamping situation of every steel strand wires of tensioning personal observations 6, if problematic timely stopping is checked do not have
Problem continues to being stretched to initial stress value and hold lotus.Holding the lotus time makes slowly to discharge pressure after, by stretching force by moveable anchor group
Part 4 is slowly passed on work anchor, and work clip sheet is made to clamp steel strand wires 6,3 oil pressure of fastening type jack is made slowly to return to zero.So
It is stretched to and meets design requirement.
Claims (7)
1. the tensioning equipment applied to the construction of small space, it is characterised in that：Including steel is distributed at the both ends of concrete box beam (1) respectively
Stretching notch (2), the inner blocking type for being installed on concrete box beam (1) end in stretching notch (2) set at twisted wire (6) is very heavy
Top (3) and the instrument anchor assemblies (4) for being used to clamp steel strand wires (6) for being installed on fastening type jack (3) inside；The tension slot groove
Mouth (2) is radially-inwardly recessed along concrete box beam (1), and the upper surface of concrete box beam (1) is penetrated through along concrete box beam (1) short transverse.
2. it is applied to the tensioning equipment of small space construction as described in claim 1, it is characterised in that：The fastening type jack
(3) cylinder body (31), piston (32) and installation set (33) are included；The cylinder body (31) is connected with installation set (33), the piston
(32) it is arranged between cylinder body (31) and installation set (33), and is slidably connected with cylinder body (31) and installation set (33)；Piston
(32) front end is equipped with the limiting plate (34) being integrally fixed with piston (32)；
The instrument anchor assemblies (4) include the moveable anchor body (41) being installed in installation set (33)；In moveable anchor body (41)
On be provided with tooling hole (42) along it axially through moveable anchor body (41), the tooling hole (42) axially includes centre along it
Taper stage casing (421), the cylindrical leading portion (422) of front end and the cylindrical back segment (423) of rear end；In taper stage casing (421)
The tool clamping piece (43) being adapted to it is inside installed, absent-mindedness set (44), the absent-mindedness set are installed in cylindrical back segment (423)
(44) one end abuts against limiting plate (34), and the other end abuts against tool clamping piece (43)；Spring is installed in cylindrical leading portion (422)
(45), the pressing plate (46) being connected with installation set (33), the spring (45) one are provided in the front end of moveable anchor body (41)
End abuts against pressing plate (46), and the other end abuts against tool clamping piece (43).
3. it is applied to the tensioning equipment of small space construction as claimed in claim 2, it is characterised in that：It is set in installation set (33)
Supporting sleeve (5) is equipped with, described supporting sleeve (5) one end is clamped with installation set (33), and the other end is clamped with moveable anchor body (41)；Institute
It states moveable anchor body (41) and the other end of supporting sleeve (5) clamping is clamped with installation set (33).
4. it is applied to the tensioning equipment of small space construction as claimed in claim 3, it is characterised in that：Pressing plate (46) clamping
Between moveable anchor body (41) and supporting sleeve (5).
5. the tensioning equipment for being applied to the construction of small space as described in claim 2-4 any one claims, feature exist
In：The holding set (47) being adapted to it is provided in cylindrical back segment (423), the spring (45) and pressing plate (46) are set with
(47) periphery is covered in holding.
6. it is applied to the tensioning equipment of small space construction as claimed in claim 5, it is characterised in that：It is set on limiting plate (34)
It is equipped with threading hole (341) passed through for steel strand wires axially through limiting plate (34) along it.
7. it is applied to the tensioning equipment of small space construction as claimed in claim 6, it is characterised in that：The threading hole (341)
It is coaxial with tooling hole (42).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711392574.8A CN108103946B (en) | 2017-12-21 | 2017-12-21 | Tensioning equipment applied to the construction of small space |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711392574.8A CN108103946B (en) | 2017-12-21 | 2017-12-21 | Tensioning equipment applied to the construction of small space |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108103946A true CN108103946A (en) | 2018-06-01 |
| CN108103946B CN108103946B (en) | 2019-04-16 |
Family
ID=62210719
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201711392574.8A Active CN108103946B (en) | 2017-12-21 | 2017-12-21 | Tensioning equipment applied to the construction of small space |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN108103946B (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110501220A (en) * | 2019-07-16 | 2019-11-26 | 武汉希萌科技有限公司 | A kind of steel strand wires elongation radial symmetric detection device |
| CN115302623A (en) * | 2022-08-26 | 2022-11-08 | 中铁十六局集团第三工程有限公司 | Narrow space beam end prestress tensioning process and continuous box girder structure |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2284770Y (en) * | 1996-04-23 | 1998-06-24 | 柳州市建筑器具厂 | Automatic anchored hydraulic jack with prestressed rib |
| JP2002242437A (en) * | 2001-02-15 | 2002-08-28 | Vsl Japan Kk | Method of fixing tendon |
| CN102953549B (en) * | 2011-08-30 | 2015-03-18 | 中铁十局集团有限公司 | Novel quick tensioning construction method for front-blocked jack |
| CN104649180A (en) * | 2014-06-24 | 2015-05-27 | 柳州市威尔姆预应力有限公司 | Internal clamping type tension jack and construction method thereof |
| CN106545539A (en) * | 2015-09-21 | 2017-03-29 | 襄阳中铁宏吉工程技术有限公司 | A kind of buried anchor inner blocking type hydraulic cylinder of tensioning |
-
2017
- 2017-12-21 CN CN201711392574.8A patent/CN108103946B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2284770Y (en) * | 1996-04-23 | 1998-06-24 | 柳州市建筑器具厂 | Automatic anchored hydraulic jack with prestressed rib |
| JP2002242437A (en) * | 2001-02-15 | 2002-08-28 | Vsl Japan Kk | Method of fixing tendon |
| CN102953549B (en) * | 2011-08-30 | 2015-03-18 | 中铁十局集团有限公司 | Novel quick tensioning construction method for front-blocked jack |
| CN104649180A (en) * | 2014-06-24 | 2015-05-27 | 柳州市威尔姆预应力有限公司 | Internal clamping type tension jack and construction method thereof |
| CN106545539A (en) * | 2015-09-21 | 2017-03-29 | 襄阳中铁宏吉工程技术有限公司 | A kind of buried anchor inner blocking type hydraulic cylinder of tensioning |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110501220A (en) * | 2019-07-16 | 2019-11-26 | 武汉希萌科技有限公司 | A kind of steel strand wires elongation radial symmetric detection device |
| CN110501220B (en) * | 2019-07-16 | 2022-03-04 | 武汉希萌科技有限公司 | Radial symmetry detection device for elongation of steel strand |
| CN115302623A (en) * | 2022-08-26 | 2022-11-08 | 中铁十六局集团第三工程有限公司 | Narrow space beam end prestress tensioning process and continuous box girder structure |
Also Published As
| Publication number | Publication date |
|---|---|
| CN108103946B (en) | 2019-04-16 |
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