CN1058820A - The field cold drawing of post-tensioned prestressed reinforcement and anchoring - Google Patents
The field cold drawing of post-tensioned prestressed reinforcement and anchoring Download PDFInfo
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- CN1058820A CN1058820A CN 91103478 CN91103478A CN1058820A CN 1058820 A CN1058820 A CN 1058820A CN 91103478 CN91103478 CN 91103478 CN 91103478 A CN91103478 A CN 91103478A CN 1058820 A CN1058820 A CN 1058820A
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Abstract
The present invention is a kind of post-tensioned prestressed reinforcement in the technology of engineering site butt welding, cold drawn and anchoring.It is to utilize precast member for reinforcing bar concrete self can bear the characteristics of very big compressive stress and the heavy frame system of the hard drawn wire reinforcement that designs, makes stretching-machine with the prestressed stretch-draw jack and uses.The prestressed reinforcement of making, the anchoring when being used for member is to adopt air ring chip ground tackle.The butt welding of post-tensioned prestressed reinforcement, cold drawn and anchoring can both be finished at engineering site.Simplified the making and the anchoring program of post-tensioned prestressed reinforcement in a large number, made things convenient for the construction of post-tensioned prestressing structure and apply.
Description
The invention belongs to the making and the anchoring process of the employed post-tensioned prestressed reinforcement of prefabricated units in the construction work.
The making of the prestressed reinforcement of post-tensioned prestressed reinforcement concrete prefabricated element and anchoring technology are the technology of a more complicated always, the making of traditional prestressed thick reinforcement generally all will be carried out in factory or reinforcement yard, with powerful steel bar butt welding machine bar dowel is welded together earlier, on large-scale cold-drawn machine, carry out cold drawn then, make elongation per unit length reach the length of designing requirement, and by the intensity of cold drawn raising reinforcing bar and the intensity of check butt joint, after all qualified, transport engineering site to large-scale exclusive trail car again and use.The equipment of its process is huge, complex process, and cost is very high.In addition, the also unusual difficulty of the anchoring of these post-tensioned prestressing bar reinforcements, conventional general anchor clamp " prestressed concrete use the anchor clamp shaping figure set " (Chinese architecture publishing house published in 1980) all has much different shortcomings separately.As: the simplest screw Duan Rod ground tackle ， Duan Rod must make the 45# steel do, and should could use through special modifier treatment, and nut also must be processed in forging and pressing, and price is very expensive.If with cone anchorage or strand tapered anchorage, then in the anchoring process, be easy to crush parent material of reinforcement rebar, the stress that forms the wound is concentrated, and the danger that causes the unexpected brittle failure of reinforcing bar is arranged, and the slippage of reinforcing bar is bigger in the anchoring process simultaneously, and loss of prestress is very big.In addition, the processing of ground tackle is also very difficult.Therefore, the processing of this cover prestressed reinforcement and anchoring technology.Bring very big difficulty for applying of post-tensioned prestressed reinforcement concrete component.
Along with on-the-spot lamination is produced the generation of post-tensioned prestressed reinforcement concrete large slab member and development and (is seen China Patent No.: 85102720.2; 85200851.1; 89204818.2; 89219426.X; 90205535.6) pressing for a kind of new technology that can at engineering site on the spot make post-tensioned prestressing bar reinforcement supporting with it, it comprises the butt welding of reinforcing bar, cold drawn and anchoring.The present invention with this end in view studies.
The objective of the invention is to utilize the precast member for reinforcing bar concrete of having produced after concrete reaches design strength, self can bear the characteristics of very big external load, design the heavy frame system that a cover can carry out steel bar cold-drawn at building-site, so that utilize existing prestress tensioning equipment to carry out the cold drawn of reinforcing bar, do not increase other large-scale cold drawn equipment and load in addition, pedestal; And the Stew of welding of the joint of reinforcing bar and anchoring major part is thick, then adopts existing gas pressure welding technology, also no longer needs powerful power equipment; Adopt a kind of novel gasket type ground tackle to carry out the anchoring of the thick head of Stew simultaneously, make that reinforcing bar does not have slippage in the anchoring process, do not crush parent material of reinforcement rebar again.This ground tackle still is a kind of important anchor, pull tool in the cold drawn heavy frame of the present invention system, can make the length of the prestressed reinforcement of making, and just in time reaches the length of designing requirement.
Adopt above-mentioned technology, can finally reach the making and the stretch-draw anchor technology that make whole prestressed reinforcement, also can both use the on-the-spot purpose of finishing in engineering, the development of formation and on-the-spot lamination production post-tensioned prestressed reinforcement concrete large slab member is supporting complete set technology fully.
One of particular content of the present invention is the condition that will can bear the characteristics of very big pressure based on the prefabricated at the scene precast member for reinforcing bar concrete of utilization itself, designs the heavy frame system of a hard drawn wire reinforcement.It comprises: the gooseneck 1.2 of two band notches alive; Two fixing reinforcing bars 3 of using of gooseneck; The Chang Rod 4 of hollow reverse Jia; A steel Zhu Jie Rod 5; A hookup 6; Punching that tension reinforcing steel bar is used or jack 7(do herein cold-drawn machine with); The ground tackle 8 of an outer endless belt screw thread; Three general ground tackles 9,10,11; Reached the concrete prefabricated element 12 of design strength; With treat cold drawn prestressed reinforcement 13 and form.As shown in Figure 1.
Below in conjunction with accompanying drawing and enforcement operating principle of the present invention and method are described as follows:
Fig. 1 is the vertical view of hard drawn wire reinforcement heavy frame system, wherein:
The 1st, at the gooseneck of the band movable chuck of anchored end;
The 2nd, at the gooseneck of the band movable chuck of stretch-draw end;
The 3rd, after the movable chuck notch of gooseneck 1,2 tightly is stuck on the prefabricated units 12, with gooseneck 1,2 and prefabricated units 12 at vertical also hoop fastening reinforcing bar (have screw thread at two ends, tighten) together tightly with bolt.
4 is heavy wall garden pipe or the Chang Rod of reverse Jia that makes with the box section of two channel-section steel buttons formation welded together.
(end has screw thread to 5 steel Zhu Jie Rod.Being screwed in one with hookup 6 reinstates).
6 one hookups (hard drawn wire reinforcement 13 and power transmission Zhu Jie Rod 5 usefulness are treated in connection).
7 one vertically-displacable jack (making cold-drawn machine herein uses) that tension reinforcing steel bar is used.
8 one gasket type ground tackles that have a screw thread at the anchor ring crust (are screwed on the hookup 6.Being used for anchoring treats hard drawn wire reinforcement 13 usefulness).
The 9th, be placed on the outside of stretch-draw jack 7, the general gasket type ground tackle of anchoring Zhu Jie Rod 5.
The 10th, be placed on the general gasket type ground tackle (when jack 7 backhauls, preventing Zhu Jie Rod 5 retraction usefulness) of the inboard anchoring Zhu Jie Rod 5 of jack 7.
The 11st, be placed on the Chang Rod of reverse Jia 4 outer ends, the general gasket type ground tackle of hard drawn wire reinforcement 13 usefulness is treated in anchoring.
The 12nd, prefabricated, reached the precast member for reinforcing bar concrete of design strength.
The 13rd, treat cold drawn prestressed reinforcement, in the anchored end of reinforcing bar a Stew head is arranged, live by ground tackle 11 anchors, at the stretch-draw end of reinforcing bar two Stew heads are arranged, the Stew head of end is lived by ground tackle 8 anchors that are screwed on the hookup 6.
Fig. 2 is the a-a sectional drawing of gooseneck among Fig. 1.Gooseneck itself is with two welded together making of channel-section steel button.Wherein:
14 is fixed chuck.
15 is movable chuck.
16 for can adjust the movable chuck position, fixedly bolt hole and the bolt used of movable chuck.
Fig. 3 is the vertical section of hookup 6, wherein:
17 is the annular gaskets in two and half gardens.
Fig. 4 is the lateral view of the Zhu Jie Rod 5 that forms with a garden steel turning.
Fig. 5 is with an equidistant Stew head of reinforcing bar, welds then that the preceding paragraph screw thread makes, the lateral view of bamboo joint Rod 5.
Fig. 6 is the sectional drawing of air ring chip ground tackle.
Fig. 7 is the a-a lateral view of Fig. 6.
Fig. 8 is the anchor ring vertical view of air ring chip ground tackle.
Fig. 9 is the b-b section of Fig. 8.
Figure 10 is the vertical view of two and half garden annular gaskets 17.
Figure 11 is the c-c section of Figure 10.
Steel bar cold-drawn embodiment:
1, the gooseneck 1,2 of one Gent system respectively is installed at the two ends of prefabricated units 12, and is adjusted movable chuck 15, make it tightly clamp prefabricated units 12.
2, answer the reinforcing bar 3 that penetrates two butt headband Luo Si Rod on the reinforcing bar position in advance in the former design and installation in prefabricated units 12 both sides, and make it pass gooseneck 1,2, tighten with bolt then, make gooseneck 1,2 cuff tightly on prefabricated units 12, form the heavy frame framework that to bear steel bar cold-drawn stress.When bearing steel bar cold-drawn stress, it is stressed that gooseneck and dop are the gusseted shape.
3, treat that in order to guarantee hard drawn wire reinforcement 13 has enough steel bar cold-drawn extension areas in the length range of prefabricated units 12, the Chang Rod 4 of reverse Jia is housed on anchored end gooseneck 1, make by " fixed length " blanking, and two ends all Stew the length that hard drawn wire reinforcement 13 stretches out one section Chang Rod 4 of reverse Jia earlier to the whole heavy frame outside in advance for the treatment of of anchoring major part and stretch-draw major part is arranged.
4, will treat that with ground tackle 11 anchored end Stew anchor of hard drawn wire reinforcement 13 live.
5, will treat that with the ground tackle on the hookup 68 the stretch-draw major part anchor of hard drawn wire reinforcement 13 stretch-draw ends lives.
6, in the outside of stretch-draw end girder steel 2 the vertically-displacable jack 7 that tension reinforcing steel bar is used is installed, is made stretching-machine and use.
7, in the center hole of vertically-displacable jack 7, penetrate Zhu Jie Rod 5, and respectively put on a ground tackle 9 and 10 at the two ends of Zhu Jie Rod 5.
8, Zhu Jie Rod 5 De Si Rod are screwed in the screw thread of hookup 6.
9, with ground tackle 9 near jack 7, with the two and half garden shape pads 17 Zhu Jie Rod 5 De Xi Rod that fill the span of a man's arms, again anchor ring is pushed to then, entangle pad 17, Zhu Jie Rod anchor is lived.
10, start jack 7, make the piston pushing tow ground tackle 9 of jack, outwards pull out bamboo joint Rod 5, make by hookup 6 and treat that hard drawn wire reinforcement 13 outwards stretches.
11, after the piston stroke of jack puts in place,, living in Zhu Jie Rod 5 near the position anchor of reinforcing bar beam 2 the ground tackle 10 of jack front end sleeve on Zhu Jie Rod 5.
12, loosen jack 7, make Zhu Jie Rod 5 be bearing on the gooseneck 2 and can not bounce back by ground tackle 10.
13, when jack 7 continued oil return, ground tackle 9 can unclamp Zhu Jie Rod 5 automatically.Behind the piston reset of jack 7, the anchor ring of ground tackle 9 is pushed to once more near position of piston, and anchor lives in Zhu Jie Rod 5 once more.
14, start jack 7 once more, make piston promote ground tackle 9, bamboo joint Rod 5 can outwards pull out again, and the ground tackle 10 of front end also unclamps bamboo joint Rod 5 thereupon automatically, makes and treats that cold drawn reinforcing bar 13 is stretched once more.
15, because the piston stroke of stretch-draw jack 7 is limited, can not once just be cold drawn to the development length of requirement, repeatedly backhaul stretches piecemeal, just can meet the requirements of length.Therefore need repeat above-mentioned operation and carry out the segmentation stretching, till treating that cold drawn reinforcing bar 13 meets the requirements of cold drawn elongation per unit length or cold drawn stress value, cold drawn work can finish.
16, unload the cold reinforcing bar that is over 13, carry out timeliness.
Two of particular content of the present invention: be the anchoring after the prestressed reinforcement stretch-draw.
The anchoring of prestressed reinforcement, be important procedure and the means that guarantee the structural element trouble free service, traditional way all is to adopt (seeing " anchor clamp shaping figure set commonly used ") such as screw Duan Rod ground tackle, strand tapered anchorage, cone anchorages, and the shortcoming of these ground tackles is a lot, needs to improve.
The objective of the invention is the full mother metal that will make being made as of prestressed reinforcement single, do not crush mother metal, the hidden danger that stress is concentrated do not occur, will guarantee also that simultaneously anchoring reliably, does not produce slippage and in the anchoring process, do not produce again, simple to operation.
The present invention adopts Stew anchor, with annular gasket or ground tackle anchoring Stew head.For this reason, prestressed reinforcement will be taked fixed length blanking, fixed length Stew head, that is: at anchoring major part of the anchored end Stew of reinforcing bar, at the stretch-draw end of reinforcing bar anchoring major part of position Stew by the design length requirement, again at stretch-draw major part of end Stew.Then reinforcing bar is put into anchor in the cold drawn heavy frame and lives the stretch-draw major part of the anchoring major part of anchored end and stretch-draw end and carry out cold drawnly, its elongation per unit length is reached till the length of designing requirement.The cold drawn prestressed reinforcement that is over is unloaded down after overaging, refilled and go on the post-tensioned structure to use.At this moment, earlier the anchoring major part of anchored end is lived with air ring chip ground tackle anchor, on the stretch-draw end, put on the anchor ring of an air ring chip ground tackle more earlier, and then live the stretch-draw major part of reinforcing bar with the Chuan Li Rod anchor of vertically-displacable jack, carry out prestressed stretch-draw, because this prestressed reinforcement is made by fixed length blanking Stew head and is cold drawn, so when reaching the stretch-draw control stress of designing requirement, anchoring major part on the stretch-draw end also just in time reaches the position that need carry out anchoring, at this moment, shift the front and the member of anchoring major part onto and be close to being through anchor ring on the reinforcing bar in advance, then the annular gasket in two and half gardens the is filled the span of a man's arms parent material of reinforcement rebar of anchoring major part front, then with anchor ring pad is entangled immediately, form a complete air ring chip ground tackle.Because anchor ring will be shifted to pad from the surface of being close to member originally, pad is entangled, so one section space will occur between final ground tackle and the component surface.The jail is tightly filled up with shape of a hoof open washer in this section space, just prestressed reinforcement has been lived at stretch-draw end also anchor.At last, cut off one section unnecessary reinforcing bar of stretch-draw major part, just finish whole anchoring work.
Advantage of the present invention is:
1, prestressed reinforcement is full mother metal, does not need other material fit, as long as need the anchoring major part of each Stew of place of anchoring and the stretch-draw major part of a special use at the two ends of reinforcing bar, does not just have other special processing request.
2, ground tackle does not crush the prestressed reinforcement mother metal, does not produce the hidden danger that stress is concentrated, reinforcing bar safe and reliable.Reinforcing bar does not have slippage in the anchoring process, and loss of prestress is little.
3, the own reliable operation of ground tackle, two and half garden annular gaskets mainly bear shear stress, and the anchor ring force-bearing table mainly bears compressive stress, and not having slip extremely may.And ground tackle processing is simple, and material is without any need for specially treated, and cost is very low.
The whole activities of 4, stretch-draw, anchoring is simple, easy to operate, is convenient to promote the use of.
Below in conjunction with drawings and Examples the present invention is further described.
Figure 12 is the operation drawing of prestressed reinforcement, wherein:
13-is the prestressed reinforcement mother metal.
The anchoring major part of 20-anchored end.
The anchoring major part of 21-stretch-draw end, the position is determined by the length that the fixed length blanking requires.
The stretch-draw major part of 22-stretch-draw end.
The anchored end of Figure 13 prestressed reinforcement on prefabricated units is lived the schematic diagram of anchoring major part with air ring chip ground tackle anchor.
The stretch-draw end of Figure 14 prestressed reinforcement on prefabricated units is earlier put on an anchor ring 24 on reinforcing bar, then with the Chuan Li Rod 5 on the jack, live the stretch-draw major part 22 of reinforcing bar by hookup 6 and ground tackle 8 anchors, prepares to carry out prestressed stretch-draw.
Figure 15 carries out prestressed stretch-draw, reach control stress for prestressing after, anchoring major part 21 should slightly grow the thickness of anchor ring 24 about pads.
Figure 16 clamps prestressed reinforcement mother metal 13 with two and half garden annular gaskets 17 in the inboard of anchor head 21.
Figure 17 pushes to anchor ring 24, entangles annular gasket 17, is assembled into a complete ground tackle.But one section space has appearred between ground tackle and the member.
Figure 18 fills in shape of a hoof open washer 25 in the space between ground tackle and member, can loosen jack.This moment, the anchoring major part 21 of prestressed reinforcement was blocked by the annular gasket in the ground tackle 17, and prestressed reinforcement can not bounce back, and has realized the anchoring to reinforcing bar.
Figure 19 downcuts stretch-draw major part 22 unnecessary on the reinforcing bar, and anchoring work is all over.
The phantom drawing signal of Figure 20 shape of a hoof open washer 25.
Claims (9)
1, the field cold drawing of post-tensioned prestressed reinforcement of the present invention is characterized in that: the characteristics of utilizing prefabricated at the scene reinforced concrete member itself can bear very big pressure, and the heavy frame system of formation hard drawn wire reinforcement.
2, heavy frame as claimed in claim 1 system, it is characterized in that: the gooseneck that is fixed on precast reinforced concrete structure two ends has movable chuck, can tightly be stuck in component ends, and it is stressed to be the gusseted shape when bearing steel bar cold-drawn stress.
3, heavy frame as claimed in claim 1 system, it is characterized in that: reverse Jia Chu Rod is installed on the anchored end gooseneck of hard drawn wire reinforcement, to guarantee in this prefabricated units length range, treat that hard drawn wire reinforcement can have enough cold drawn expanded ranges in cold drawing process.
4, heavy frame as claimed in claim 1 system is characterized in that: transmitting the cold drawn stress of jack to the Chuan Li Rod that treats hard drawn wire reinforcement, is a Zhu Jie Rod, and front end has screw thread.
5, heavy frame as claimed in claim 1 system is characterized in that: the transmission of cold drawn stress is the hookup of screw thread in having by two ends, bamboo joint Rod with treat that hard drawn wire reinforcement is bound up.
6, heavy frame as claimed in claim 1 system is characterized in that: in the steel bar cold-drawn process, anchoring treats that the ground tackle of hard drawn wire reinforcement and bamboo joint Rod all is an air ring chip ground tackle.
7, air ring chip ground tackle as claimed in claim 6 is characterized in that: this ground tackle is made up of the anchor ring and the two and half garden annular gaskets of band load step.
8, heavy frame as claimed in claim 1 system, it is characterized in that: treating that hard drawn wire reinforcement is a Stew head in anchored end, is an anchoring major part and a stretch-draw major part at the stretch-draw end.
9, the anchoring of prestressed reinforcement as claimed in claim 8 is characterized in that: reinforcing bar is the employed ground tackle of anchoring during stretch-draw on prefabricated units, is air ring chip ground tackle as claimed in claim 6.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91103478 CN1029793C (en) | 1991-05-24 | 1991-05-24 | Post-tensioned prestressed reinforcement field cold drawing and anchoring |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 91103478 CN1029793C (en) | 1991-05-24 | 1991-05-24 | Post-tensioned prestressed reinforcement field cold drawing and anchoring |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1058820A true CN1058820A (en) | 1992-02-19 |
| CN1029793C CN1029793C (en) | 1995-09-20 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 91103478 Expired - Fee Related CN1029793C (en) | 1991-05-24 | 1991-05-24 | Post-tensioned prestressed reinforcement field cold drawing and anchoring |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1029793C (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2840935A1 (en) * | 2002-06-12 | 2003-12-19 | Andre Loew | Beam type masonry construction element comprises end to end aligned blocks having cavity constituting channel extending over whole assembled length and traction rod on channel with end connections to end blocks for clamping blocks |
| CN110814651A (en) * | 2019-11-14 | 2020-02-21 | 鞍钢建设集团有限公司 | Manufacturing method of anchoring piece for steel structure building beam column decoration module component |
-
1991
- 1991-05-24 CN CN 91103478 patent/CN1029793C/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2840935A1 (en) * | 2002-06-12 | 2003-12-19 | Andre Loew | Beam type masonry construction element comprises end to end aligned blocks having cavity constituting channel extending over whole assembled length and traction rod on channel with end connections to end blocks for clamping blocks |
| CN110814651A (en) * | 2019-11-14 | 2020-02-21 | 鞍钢建设集团有限公司 | Manufacturing method of anchoring piece for steel structure building beam column decoration module component |
| CN110814651B (en) * | 2019-11-14 | 2021-09-21 | 鞍钢建设集团有限公司 | Manufacturing method of anchoring piece for steel structure building beam column decoration module component |
Also Published As
| Publication number | Publication date |
|---|---|
| CN1029793C (en) | 1995-09-20 |
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