CN2695428Y - Front clamp type low expansion lifting jack - Google Patents
Front clamp type low expansion lifting jack Download PDFInfo
- Publication number
- CN2695428Y CN2695428Y CN 200420047752 CN200420047752U CN2695428Y CN 2695428 Y CN2695428 Y CN 2695428Y CN 200420047752 CN200420047752 CN 200420047752 CN 200420047752 U CN200420047752 U CN 200420047752U CN 2695428 Y CN2695428 Y CN 2695428Y
- Authority
- CN
- China
- Prior art keywords
- roof pressure
- cylinder body
- jack
- lifting jack
- ground tackle
- 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.)
- Expired - Lifetime
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Abstract
The utility model relates to a front clamp type low expansion top-pressed lifting jack which is an anchoring special tool of a steel strand in a railway bridge and culvert short prestressed concrete structure by a top-pressed anchor. The front clamp type low expansion top-pressed lifting jack comprises a top-pressed lifting jack and an anchor locking mechanism; a piston is arranged inside the cylinder body of the lifting jack; the front end part of the piston is provided with a top-pressure rod and a top-pressure head; the anchor locking mechanism is connected on the outer part of the top-pressure head; the outer part of the cylinder body is provided with a hydraulic valve body, an oil inlet into the cylinder and an oil inlet out of the cylinder; a handle is also arranged on the upper part of the cylinder body; a movable scale is arranged inside the handle. A locking mechanism with pressure bearing nut anchor is arranged on the front end of the lifting jack; the utility model adopts a secondary stretching technology; for shorter prestressed ribs, the front clamp type low expansion top-pressed lifting jack can satisfy the related requirements in a criterion and can observably enhance the availability factor of the prestressed ribs; the utility model has the advantages of simple operation, light weight, relieving labor intensity and enhancing the level of prestress.
Description
Technical field
Cassette hangs down retraction roof pressure jack before the utility model relates to YQD type series, and it is to adopt low retraction type ground tackle to carry out indispensable special tool in the roof pressure anchoring in the short prestressed reinforced concrete construction of railway bridges and culverts.
Technical background
By the regulation of existing " railway bridges and culverts prestressed reinforced concrete construction design regulation ", the amount of recovery of ground tackle should not surpass 6mm, and its amount of recovery loss simultaneously should be greater than 3.5% of design control stress for prestressing.In domestic each prestressed stretch-draw system, strand tapered anchorage adopts follow-up anchoring automatically at present, and the ground tackle amount of recovery is about 5mm; If adopt the roof pressing type anchoring, the ground tackle amount of recovery is about 3.5mm.For long prestressing tendon (generally surpassing 20m), the loss of prestress that the ground tackle amount of recovery is caused is very little, can satisfy the requirement of control stress for prestressing; (generally 2～10m), the amount of recovery of its ground tackle surpasses " standard " regulation, and its amount of recovery is bigger than normal, will cause bigger loss of prestress but for short prestressing tendon.Prestress wire at Φ 15.2mm, two kinds of diameters of Φ 12.7mm, our unit develops successfully low retraction prestressed stretch-draw system, use the strand tapered anchorage of band pressure-bearing nut can overcome above-mentioned defective, realize that the amount of recovery of ground tackle is controlled in the 0.5mm.But in construction, must provide the special tool that is complementary and uses with it---the low retraction of a kind of preceding cassette roof pressure jack product comes out.
Summary of the invention
The purpose of this utility model is to provide the low retraction of a kind of preceding cassette roof pressure jack, in the construction of the short steel strand prestress concrete structure of railway bridges and culverts, when using the strand tapered anchorage of being with the pressure-bearing nut to carry out anchoring, the special tool that is complementary with it must be provided, realize the requirement that the amount of recovery of this ground tackle meets " standard ".
The low retraction of cassette roof pressure jack before a kind of, include roof pressure jack and ground tackle catch gear, it is characterized in that jack is a columniform cylinder body, in cylinder body, be provided with the instrument intermediate plate that clamps prestress wire, intermediate plate is that the semicircular body in two wedge type cross sections constitutes, and the outside of this instrument intermediate plate is with clamping wedge.Be provided with piston in the oil pocket of cylinder body, the front end of piston is provided with compression bar and roof pressure head, is provided with spring between compression bar and the roof pressure head, simultaneously is externally connected to the ground tackle catch gear at the roof pressure head.
The ground tackle catch gear includes top anchor cover, and the outer setting of overlapping at the top anchor has supporting sleeve, and the supporting sleeve outer setting has locking jacket, and the indoor design of locking jacket is interior hexagonal (hexagon)nut type, and locking jacket and rotary handle are connected as a single entity.
Top at the ground tackle catch gear is provided with oil separator.
The hydraulic valve body is arranged and advance the cylinder hydraulic fluid port and go out the cylinder hydraulic fluid port in the outer setting of jack cylinder body.
Top at cylinder body also is provided with handle, is provided with mobile scale in the handle, and the other end of scale is fixed on the bearing of oil separator.
The utility model is the catch gear that pressure-bearing nut ground tackle is arranged in the front-end configuration of jack, and employing two times tensioning technological process, make short prestressing tendon accurately control prestress, satisfy the related request in " standard ", improve the service efficiency of prestressing tendon.On jack, be equipped with scale in addition, can directly read the elongation of prestressing tendon, convenient prestressed Construction control.
Should before the low retraction of cassette roof pressure jack can with the supporting use of existing various high-pressure oil pumps, it is the very strong tensioning equipment of a kind of commonality.Be characterized in compact conformation, good airproof performance, simple to operate, volume is little, in light weight, can reduce labor intensity, increased work efficiency, improved the level of prestressing, its economical, societal benefits are very remarkable.
Description of drawings
Fig. 1 is a structural representation of the present utility model.
Fig. 2 is the birds-eye view of Fig. 1.
Fig. 3 is the lateral plan of Fig. 1.
Fig. 4 implements illustration for the utility model.
Fig. 5 is the local enlarged diagram of Fig. 4.
Wherein 1 cylinder body, 2 pistons, 3 jack intermediate plates, 4 compression bars, 5 roof pressure heads, 6 supporting sleeves, 7 top anchor covers, 8 drawing handles, 9 valve bodies, 10 handles, 11 scales, 12 rotary handles, 13 oil separators, 14 locking jackets, 15 advance cylinder hydraulic fluid port, 16 and go out cylinder hydraulic fluid port, 17 clamping wedges, 18 anchor plates, 19 strand tapered anchorages, 20 steel strand, 21 railway bridges and culverts, 100 roof pressure jacks, 200 ground tackle catch gears.
The embodiment explanation
Shown in the 1-3, structure of the present utility model is illustrated in conjunction with the accompanying drawings:
The low retraction of cassette roof pressure jack includes roof pressure jack 100 and ground tackle catch gear 200 before a kind of.Jack 100 is a columniform cylinder body 1, is provided with the jack intermediate plate 3 that clamps prestress wire 20 in cylinder body 1, and the jack intermediate plate is that the semicircular body in two wedge type cross sections constitutes.Be with clamping wedge 17 in the outside of jack intermediate plate 3.Be provided with piston 2 in the oil pocket of cylinder body 1, the front end of piston 2 is provided with compression bar 4 and roof pressure head 5, is provided with spring between compression bar 4 and the roof pressure head 5, is connected with ground tackle catch gear 200 in the slide outside of roof pressure head 5.
Ground tackle catch gear 200 includes top anchor cover 7, in the outer setting of top anchor cover 7 supporting sleeve 6 is arranged, and supporting sleeve 6 is outside equipped with locking jacket 14, and the indoor design of locking jacket 14 is interior hexagonal (hexagon)nut, and locking jacket 14 is connected as a single entity with rotary handle 12.Be provided with oil separator 13 on the top of ground tackle catch gear.
The utility model is performed such when implementing operation:
Press accompanying drawing 4, shown in 5 structures, earlier steel strand 20 are penetrated in the preformed hole of railroad bridge, at the stretch-draw end strand tapered anchorage 19 is through on the steel strand 20, the anchor slab of ground tackle pushes against on anchor plate 18, the outer pressure-bearing nut of anchor slab is threaded to from 1mm place, anchor slab bottom, work clip sheet evenly urgent making exposes unanimity, steel strand 20 need expose the outer 25cm of intermediate plate (can be with common strand tapered anchorage at another fixed end of railroad bridge, steel strand expose the outer 3cm of intermediate plate and get final product), again roof pressure jack 100 is penetrated on the steel strand 20, the interior hexagonal (hexagon)nut of the locking jacket 14 of jack front end and the pressure-bearing hexagonal nut of strand tapered anchorage 200 align and are inserted in, the jack front end is pushed against on anchor plate 18, begin to start the hydraulic control system of jack then.Instrument intermediate plate in the jack clamps an end of prestress wire 20.At this moment, jack 100 carries out the stretch-draw operation under the control of oil pressure, press two times tensioning technology, makes stretching force reach design value twice, locking pressure-bearing nut.After stretch-draw is finished, unload roof pressure jack 100, strand tapered anchorage 19 is anchored at steel strand 20 Liang Tishang of railroad bridge 21.
Specific operation process is as follows:
1. the startup oil pump is all opened into and out of the shutoff valve and the flow regulating valve of oil circuit, realizes the oil pump starting under no load.At this moment the drawing handle among Fig. 18 is pushed forward to the end.Slowly fasten the shutoff valve of in-line, adjust flow regulating valve, hydraulic pressure oil is by advancing in the oil pocket that cylinder hydraulic fluid port 15 enters into cylinder body, and this moment, jack carried out stretch-draw under the effect of oil pressure.When stretching force reached for the first time the engineering stress value, in-line was held lotus, and the shutoff valve of oil pump oil return line is closed, and slowly adjusts flow regulating valve, makes the pressure of oil return line rise to 15-20Mpa.At this moment, in the intermediate plate jacking anchor slab of the compression bar 4 of jack front end with strand tapered anchorage, realize anchoring.Open the shutoff valve of in-line again, make the in-line off-load, jack returns cylinder, finishes stretch-draw for the first time.The amount of recovery of the prestressing tendon (being steel strand 20) of this moment is 3.5mm.On the scale 11 that in jack handle 10, is provided with, can demonstrate its amount of recovery simultaneously.
2. stretch-draw for the second time is in order to lock the pressure-bearing nut of strand tapered anchorage 19, to reduce the amount of recovery of prestressing tendon.At first the drawing handle among Fig. 18 is pulled back into the end, again to the in-line fuel feeding.Steel strand 20 drive ground tackle and are drawn out together.When stretching force reaches the engineering stress value again, hold lotus.Move tight lock handle 12, the pressure-bearing nut of strand tapered anchorage 19 is tightened onto anchor plate 18, ground tackle is locked, and stretch-draw anchor is finished.Open the shutoff valve of in-line again, make the in-line off-load, jack returns cylinder, finishes stretch-draw for the second time.After two times tensioning is finished, can guarantee the value of the amount of recovery of steel strand 20 less than 0.5mm.
Claims (4)
1, the low retraction of a kind of preceding cassette roof pressure jack includes roof pressure jack and ground tackle catch gear, it is characterized in that:
Jack is a columniform cylinder body, is provided with the instrument intermediate plate that clamps prestress wire in cylinder body, and the outside of instrument intermediate plate is with clamping wedge; In the cylinder body oil pocket, be provided with piston, be provided with compression bar and roof pressure head, be provided with spring between compression bar and the roof pressure head, be externally connected to the ground tackle catch gear at the roof pressure head at the front end of piston;
The ground tackle catch gear includes top anchor cover, and the outer setting of overlapping at the top anchor has supporting sleeve, and the supporting sleeve outer setting has locking jacket, and the indoor design of locking jacket is interior hexagonal (hexagon)nut type, and locking jacket and rotary handle are connected as a single entity.
2, the low retraction of cassette roof pressure jack before according to claim 1, the outer setting that it is characterized in that cylinder body has the hydraulic valve body and advances the cylinder hydraulic fluid port and go out the cylinder hydraulic fluid port.
3, the low retraction of preceding cassette according to claim 1 roof pressure jack is characterized in that being provided with oil separator on the top of ground tackle catch gear.
4, the low retraction of preceding cassette according to claim 1 roof pressure jack is characterized in that also being provided with handle on the top of cylinder body, is provided with mobile scale in the handle, and the other end of scale is fixed on the bearing of oil separator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420047752 CN2695428Y (en) | 2004-05-17 | 2004-05-17 | Front clamp type low expansion lifting jack |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 200420047752 CN2695428Y (en) | 2004-05-17 | 2004-05-17 | Front clamp type low expansion lifting jack |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN2695428Y true CN2695428Y (en) | 2005-04-27 |
Family
ID=34776148
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 200420047752 Expired - Lifetime CN2695428Y (en) | 2004-05-17 | 2004-05-17 | Front clamp type low expansion lifting jack |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN2695428Y (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102182146A (en) * | 2011-03-29 | 2011-09-14 | 中国铁道科学研究院铁道建筑研究所 | Prestress rib tensioning equipment, system and method and concrete continuous box girder |
| CN102776830A (en) * | 2012-08-10 | 2012-11-14 | 浙江省交通规划设计研究院 | Large-tonnage low-retraction pres-stress anchor and tightening device thereof |
| CN103321433A (en) * | 2013-07-10 | 2013-09-25 | 北海精一混凝土制品有限责任公司 | Automatic tensioning machine |
| CN103771292A (en) * | 2014-02-26 | 2014-05-07 | 北京市建筑工程研究院有限责任公司 | Self-climbing jack, and self-climbing construction device and construction method |
| CN104860226A (en) * | 2015-04-27 | 2015-08-26 | 同济大学 | Prestress tensioning jack equipment with adjustable limiting device |
| CN109235272A (en) * | 2018-10-18 | 2019-01-18 | 江苏燕宁工程科技集团有限公司 | Anti-skidding stretch-draw jack |
| CN113605739A (en) * | 2021-09-13 | 2021-11-05 | 安徽省路港工程有限责任公司 | Prestressed FRP rib tensioning and anchoring device |
-
2004
- 2004-05-17 CN CN 200420047752 patent/CN2695428Y/en not_active Expired - Lifetime
Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102182146A (en) * | 2011-03-29 | 2011-09-14 | 中国铁道科学研究院铁道建筑研究所 | Prestress rib tensioning equipment, system and method and concrete continuous box girder |
| CN102776830A (en) * | 2012-08-10 | 2012-11-14 | 浙江省交通规划设计研究院 | Large-tonnage low-retraction pres-stress anchor and tightening device thereof |
| CN103321433A (en) * | 2013-07-10 | 2013-09-25 | 北海精一混凝土制品有限责任公司 | Automatic tensioning machine |
| CN103321433B (en) * | 2013-07-10 | 2016-01-13 | 北海精一混凝土制品有限责任公司 | Automatic Tensioning machine |
| CN103771292A (en) * | 2014-02-26 | 2014-05-07 | 北京市建筑工程研究院有限责任公司 | Self-climbing jack, and self-climbing construction device and construction method |
| CN104860226A (en) * | 2015-04-27 | 2015-08-26 | 同济大学 | Prestress tensioning jack equipment with adjustable limiting device |
| CN109235272A (en) * | 2018-10-18 | 2019-01-18 | 江苏燕宁工程科技集团有限公司 | Anti-skidding stretch-draw jack |
| CN113605739A (en) * | 2021-09-13 | 2021-11-05 | 安徽省路港工程有限责任公司 | Prestressed FRP rib tensioning and anchoring device |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CX01 | Expiry of patent term |
Expiration termination date: 20140517 Granted publication date: 20050427 |