CN108103946B - Tensioning equipment applied to the construction of small space - Google Patents
Tensioning equipment applied to the construction of small space Download PDFInfo
- Publication number
- CN108103946B CN108103946B CN201711392574.8A CN201711392574A CN108103946B CN 108103946 B CN108103946 B CN 108103946B CN 201711392574 A CN201711392574 A CN 201711392574A CN 108103946 B CN108103946 B CN 108103946B
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- box beam
- concrete box
- construction
- small space
- installation set
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Classifications
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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
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2/00—Bridges characterised by the cross-section of their bearing spanning structure
- E01D2/04—Bridges characterised by the cross-section of their bearing spanning structure of the box-girder type
-
- E—FIXED CONSTRUCTIONS
- E01—CONSTRUCTION OF ROADS, RAILWAYS, OR BRIDGES
- E01D—CONSTRUCTION OF BRIDGES, ELEVATED ROADWAYS OR VIADUCTS; ASSEMBLY OF BRIDGES
- E01D2101/00—Material constitution of bridges
- E01D2101/20—Concrete, stone or stone-like material
- E01D2101/24—Concrete
- E01D2101/26—Concrete reinforced
- E01D2101/28—Concrete reinforced prestressed
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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Reinforcement Elements For Buildings (AREA)
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 tool anchor assemblies being installed on inside fastening type jack；The stretching notch is radially-inwardly recessed along concrete box beam, and along the upper surface of concrete box beam short transverse perforation concrete box beam.The present invention, by the way that tool anchor assemblies are built in fastening type jack, effectively save space required for 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 successive 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 fields, are particularly applied to the tensioning equipment of small space construction.
Background technique
Steel box-girder generally uses prefabrication to produce, 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 template installation, reinforcing bar binding using bracket is set up on the spot on bracket
And concrete placings work, finally the stretching notch reserved in concrete beam-ends head position carries out pre-stress construction.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.Currently, concrete case
Girder tensioning is completed using conventional centre-hole jack, is had as following drawbacks:
1, first steel box-girder, i.e. conventional construction technique are installed in construction Cast-in-place concrete box beam, completion to be tensioned again later.It is unfavorable in this way
In quickly propelling for overall construction speed, there may be situations such as the work holdup, the wasting of resources, virtually increase cost；
2, 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, wait open
Pull into later that welded closure, this way are unfavorable for girder steel overall structure quality again.
3, steel box-girder is first installed, is 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 support is changed, original design intention has been violated, is unfavorable for bridge security.
4, steel box-girder is first installed, concrete box beam uses one-end tension.The applicable condition of such case is harsh, moreover is less than 25m
Straight-line prestressed structure it is inherently fewer, institute have very much limitation in this way.
Summary of the invention
Technical problem to be solved by the invention is 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 that: applied to the tensioning equipment of small space construction, including respectively in concrete box beam
It is very heavy that the stretching notch being arranged 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 tool anchor assemblies for being used to clamp steel strand wires inside fastening type jack；The stretching notch is along concrete box beam diameter
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 set between cylinder body and installation set, and is slidably connected with cylinder body and installation set；It installs the front end of piston
There is the limit plate being integrally fixed with piston；
The tool anchor assemblies include the moveable anchor ontology being installed in installation set；It is provided on moveable anchor ontology along it
Axially through the tooling hole of moveable anchor ontology, the tooling hole includes the taper middle section of centre, the cylinder of front end along its axial direction
The cylindrical back segment of leading portion and rear end；The tool clamping piece being adapted to it is installed in taper middle section, is installed in cylindrical back segment
There is absent-mindedness to cover, absent-mindedness set one end abuts against limit 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 ontology, the spring one end abuts against pressing plate, and the other end abuts against
Tool clamping piece.
Further, support sleeve is provided in installation set, described support sleeve one end and installation set are clamped, the other end and work
Has the clamping of anchor ontology；The other end and installation set of the moveable anchor ontology and support sleeve clamping are clamped.
Further, the pressing plate is connected between moveable anchor ontology and support 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, the threading hole passed through for steel strand wires along it axially through limit plate is provided on limit plate.
Further, the threading hole and tooling hole are coaxial.
The beneficial effects of the present invention are: stretching notch is along concrete box beam diameter by the way that stretching notch is arranged at the both ends of concrete box beam
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 tool anchor assemblies are built in fastening type jack, space required for tensioning is effectively saved, is especially fitted
It closes in narrow space tensioning operation, is the design conditions of steel box girder, pre-stress construction for PRC structure both ends
No longer limited by steel box-girder end steel plate, can successive 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.
Detailed description of the invention
Fig. 1 is schematic diagram of the present invention；
Fig. 2 is the A-A cross-sectional view of Fig. 1；
Fig. 3 is structural schematic diagram of the invention；
Fig. 4 is fastening type jack structural schematic diagram.
In figure, concrete box beam 1, stretching notch 2, fastening type jack 3, cylinder body 31, piston 32, installation set 33, limit plate 34,
Threading hole 341, tool anchor assemblies 4, moveable anchor ontology 41, tooling hole 42, taper middle section 421, cylindrical leading portion 422, cylinder
Back segment 423, absent-mindedness set 44, spring 45, pressing plate 46, keeps set 47, support sleeve 5, steel strand wires 6 at tool clamping piece 43.
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 being arranged 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 tool 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 along the upper surface of 1 short transverse of concrete box beam perforation concrete box beam 1.
The present invention, by the way that stretching notch 2 is arranged 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 tool anchor assemblies 4 are built in fastening type jack 3, space required for 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 successive 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 set 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 limit plate 34 being integrally fixed with piston 32；
The tool anchor assemblies 4 include the moveable anchor ontology 41 being installed in installation set 33；It is set on moveable anchor ontology 41
It is equipped with the tooling hole 42 along it axially through moveable anchor ontology 41, the tooling hole 42 includes intermediate taper middle section along its axial direction
421, the cylindrical back segment 423 of the cylindrical leading portion 422 of front end and rear end；It is equipped in taper middle section 421 and is adapted to it
Tool clamping piece 43 is equipped with absent-mindedness set 44 in cylindrical back segment 423, and the absent-mindedness covers 44 one end and abuts against limit plate 34, the other end
Abut against tool clamping piece 43；Spring 45 is installed in cylindrical leading portion 422, is provided with and installation set in the front end of moveable anchor ontology 41
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 ontology 41 is installed on implementation tool anchor assemblies 4 in installation set 33 and is built in jack, thus in improving
The structural compactness of clip type jack 3, space needed for saving tensioning.And by the way that tooling hole is arranged on moveable anchor ontology 41
42, tool clamping piece 43, absent-mindedness set 44 and spring 45 are concentrated in tooling hole 42, the globality of moveable anchor ontology 41 is improved,
Convenient for the assembling of moveable anchor ontology 41.The limit plate 34 being integrally fixed with piston 32 is installed by the front end of piston 32, is led to
The structure in limit plate 34 and the stretching notch 2 of concrete box beam 1 is crossed, such as work anchor, work clip sheet match, realizes tensioning, limit
Position 34 structure of plate is simple, and thickness is small, has further reduced the size of fastening type jack 3.
Preferably, support sleeve 5 is provided in installation set 33, described 5 one end of support sleeve and installation set 33 are clamped, the other end
It is clamped with moveable anchor ontology 41；The other end and installation set 33 that the moveable anchor ontology 41 is clamped with support sleeve 5 are clamped.
Moveable anchor ontology 41, support sleeve 5 and installation set 33 are clamped by the way that corresponding limited step is arranged, between three
It mutually restricts, structure is simple, stability is high.
Preferably, the pressing plate 46 is connected between moveable anchor ontology 41 and support 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 the use along it axially through limit plate 34 is provided on limit 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.
When tensioning, the stretching end of steel strand wires 6 is sequentially passed through to threading hole 341, absent-mindedness set 44, tool clamping piece of limit 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, tool clamping piece 43 clamps steel under the action of spring 45, tool clamping piece 43
Twisted wire 6, meanwhile, tensioning personnel observe the clamping situation of every steel strand wires 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 slow release pressure after, by stretching force by moveable anchor group
Part 4 slowly passes on work anchor, so that work clip sheet is clamped 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 (6)
1. being applied to the tensioning equipment of small space construction, 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) being arranged at twisted wire (6) are very heavy
Top (3) and the tool 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 along the upper surface of concrete box beam (1) short transverse perforation concrete box beam (1)；
The fastening type jack (3) includes cylinder body (31), piston (32) and installation set (33)；The cylinder body (31) and installation set
(33) be connected, the piston (32) is set between cylinder body (31) and installation set (33), and with cylinder body (31) and installation set
(33) it is slidably connected；The front end of piston (32) is equipped with the limit plate (34) being integrally fixed with piston (32)；
The tool anchor assemblies (4) include the moveable anchor ontology (41) being installed in installation set (33)；In moveable anchor ontology (41)
On be provided with tooling hole (42) along it axially through moveable anchor ontology (41), the tooling hole (42) includes centre along its axial direction
Taper middle section (421), the cylindrical leading portion (422) of front end and the cylindrical back segment (423) of rear end；In taper middle section (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 limit 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 ontology (41)
End abuts against pressing plate (46), and the other end abuts against tool clamping piece (43).
2. being applied to the tensioning equipment of small space construction as described in claim 1, it is characterised in that: set in installation set (33)
It is equipped with support sleeve (5), described support sleeve (5) one end and installation set (33) are clamped, and the other end and moveable anchor ontology (41) are clamped；Institute
The other end and installation set (33) for stating moveable anchor ontology (41) and support sleeve (5) clamping are clamped.
3. being applied to the tensioning equipment of small space construction as claimed in claim 2, it is characterised in that: pressing plate (46) clamping
Between moveable anchor ontology (41) and support sleeve (5).
4. the tensioning equipment for being applied to the construction of small space as described in claim 1-3 any one claim, feature exist
In: it is provided with the holding set (47) being adapted to it in the cylindrical back segment (423), the spring (45) and pressing plate (46) are set with
(47) periphery is covered in holding.
5. being applied to the tensioning equipment of small space construction as claimed in claim 4, it is characterised in that: set on limit plate (34)
It is equipped with the threading hole (341) passed through for steel strand wires along it axially through limit plate (34).
6. being applied to the tensioning equipment of small space construction as claimed in claim 5, 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 CN108103946A (en) | 2018-06-01 |
| CN108103946B true CN108103946B (en) | 2019-04-16 |
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| 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 |
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| Country | Link |
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| CN (1) | CN108103946B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| 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 |
| CN115302623B (en) * | 2022-08-26 | 2023-08-01 | 中铁十六局集团第三工程有限公司 | Prestressed tensioning process for narrow space beam end and continuous box beam 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 |
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| Publication number | Publication date |
|---|---|
| CN108103946A (en) | 2018-06-01 |
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