CN101985858A - Hydraulic fracturing stripping unbonded prestressed reinforcement surface concrete construction method - Google Patents
Hydraulic fracturing stripping unbonded prestressed reinforcement surface concrete construction method Download PDFInfo
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- CN101985858A CN101985858A CN 201010502575 CN201010502575A CN101985858A CN 101985858 A CN101985858 A CN 101985858A CN 201010502575 CN201010502575 CN 201010502575 CN 201010502575 A CN201010502575 A CN 201010502575A CN 101985858 A CN101985858 A CN 101985858A
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Abstract
The invention relates to the technical field of building construction, in particular to a hydraulic fracturing stripping unbonded prestressed reinforcement surface concrete construction method which comprises the steps of construction preparation, determination of breaking point of prestressed reinforcement, determination of cutting position and depth, cutting of non-prestressed reinforcement with static force, hydraulic fracturing, clearing of the surface concrete of the prestressed reinforcement and the like. In the construction method, the cutting, drilling and hydraulic fracturing of concrete in a pre-determined area are realized by using equipment such as a cutting machine, a drilling machine, a hydraulic fracturing machine and the like, and the surface concrete of the prestressed reinforcement are stripped, thus the operation is simple, the efficiency is high and the cost low; and moreover, static force operation is adopted, vibration damage on the existing structure can be prevented, the noise is low, dust is less, safety and environmental protection are ensured and the method has high economical and social benefits.
Description
Technical field
The present invention relates to technical field of building construction, be meant that specifically the splitting of a kind of employing hydraulic pressure peels off unbonded prestressing tendon top layer concrete construction method.
Background technology
The transformation of prestressing without bondn coagulation upper frame (hereinafter to be referred as the prestressing without bondn framework) structure is the difficult point in the improvement project always, and this mainly causes owing to prestressing without bondn frame construction characteristic.The prestressing without bondn frame construction is set up effective prestress by the prestressing without bondn system in framework.In this class formation, unbonded prestressing tendon is the main stress reinforcing bar of structure.Compare with other structure, the characteristic of this system maximum is that the prestressing force in the member transmits performance fully by the end anchorage carrying thereby make the interior presstressed reinforcing steel of structure have the stress total length owing to do not have cementation between presstressed reinforcing steel and the concrete.Because this characteristic, the prestressing without bondn structure is when rebuilding construction, must be in the face of the series influence that presstressed reinforcing steel cuts off or anchorage point causes after destroying, cause that as: prestressed failure structural bearing capacity significantly reduces when serious (may produce continuously collapse), prestressing moment and concentrates and discharge damage that the enormous impact power that produces may cause structure node or weak part and destruction, ground tackle and launch and cause personal accident and prestressed efficient recovery etc. arranged.Above problem often causes the increase of improvement project construction cost, the increase of construction safety risk and the prolongation of duration.For overcoming the above problems, the prestressing without bondn framework must be put the presstressed reinforcing steel in the member before dismounting and open, and member is returned to unstress state from high-stress state.And presstressed reinforcing steel is put the stripping operation of Zhang Qianqi surrounding concrete, is the primary condition that can prestressed reinforcement effectively implement to put a means.
Traditional prestressed girder concrete is peeled off general employing hand breaking method.The hand breaking method can reach the quality requirement of concrete fragmentation, but has the problem of the following aspects simultaneously:
1, cost height finishes that a place Vierendeel girder concrete is broken to be needed: 100 yuan of/day people * 4 people * 4 working day+60 yuan=1660 yuan, 42.33 ten thousand yuan of 255 points of whole engineering estimated costs;
2, labour demand is big, adopts every layer of this programme to need 40 experienced operators to operate simultaneously approximately.
3, effect is low, because this engineering concrete actual strength generally surpasses C40, needs 4 experienced operators to spend 4 day time and just can finish the broken work of place Vierendeel girder presstressed reinforcing steel top layer concrete.
4, long in time limit, take all factors into consideration that interlayer construction is arranged and the influence of other operation after, the construction period is about 5 months, can't satisfy construction period.
5, have potential safety hazard, the levels square crossing is constructed and is faced the limit construction and cause potential safety hazard easily.
6, not enough environmental protection, the construction site is generally located at the business district, and airborne dust and noise can't satisfy environmental requirement.
Except the hand breaking method, lift-off technology also comprises on the coagulation that adopts usually in the construction: 1, water bores the Static crushing method; 2, chemically expansible crush method; 3, explosion and crushing method; 4, machine cuts method.Now above-mentioned several concrete stripping means contrasts are listed as follows:
(annotate: in the table: ☆ satisfies, and △ is satisfied substantially, and ◎ does not satisfy)
Practice of construction finds that though chemically expansible crush method cost significantly reduces, easy construction is saved manually, because the prestressed member characteristic, drilling depth is restricted, can't effectively bring into play its crushing effect, causes efficiency of construction low, can't satisfy construction period equally.
Summary of the invention
At the problems referred to above, patent of the present invention provides a kind of hydraulic pressure splitting to peel off unbonded prestressing tendon top layer concrete construction method, and it is fast that it has construction speed, and construction cost is low, advantages such as construction safety.
Unbonded prestressing tendon top layer concrete construction method is peeled off in hydraulic pressure splitting of the present invention, and it may further comprise the steps:
(1) determines prestressing force breaking of muscle and tendon muscle point
According to original structure working drawing and constructure scheme, determine the disconnected muscle point of presstressed reinforcing steel in the unbonded prestressed concrete structure.
(2) determine the cutting position and the degree of depth
According to the design drawing requirement, determine the position of the disconnected muscle point of unbonded prestressing tendon, to light to broken direction from disconnected muscle and extend 800～1000mm as the zone that strips out steel strand, regional end is as line of cut.Check drawing, determine depth of cut according to the concrete thickness in unbonded prestressing tendon top layer under the line of cut, purpose is that non-prestressing tendon all cuts off above the steel strand that need are stripped out, and makes this zone form the broken groove that can implement the hydraulic pressure splitting.
(3) static(al) cutting non-prestressing tendon
According to the line of cut of putting well, after determining the cutting equipment installation in position, start cutting equipment, begin cutting along an end of line of cut, when reaching the depth of cut of designing requirement, set cutting equipment and carry out horizontal resection, when cutting is finished, and non-prestressing tendon all is cut off in definite structure, reached the purpose that forms broken groove after, pull down cutting equipment, for next process is prepared.
(4) hydraulic pressure splitting fragmentation
1. at broken groove open interior: install auger, position, the design hole arrangement diagram according in the constructure scheme carries out perforate in broken zone, and the depth of cut that hole depth rate calculates is deepened 100mm, and the aperture is not less than 46mm.
2. the splitting device is also installed in clear hole: after the broken hole layout in the broken zone, a place is finished, clear up broken hole.According to the instructions for use of hydraulic pressure cleaving device, by the predetermined broken direction of design, will divide head and put into broken hole, connect hydraulic pressure splitting device.
3. hydraulic pressure splitting fragmentation: check that each connects and whether put in place, determine errorless after, the primer fluid pressing system slowly pressurizes until the concrete cracking fragmentation.
In the above-mentioned steps, also comprise the cutting before preparation process, described preparation of construction step comprises:
1. work out the special scheme of the broken construction of hydraulic pressure split the law, and follow procedure is examined;
2. the special scheme of the bracing frame of removing member is set up in establishment, and follow procedure is examined;
3. operating personnel are confided a technological secret;
4. clear up the job site, guarantee the operating space;
5. debug various operating equipments, guarantee that equipment operation is normal;
6. set up the lower support of removing regional inner member.
Also comprise after the step of described hydraulic pressure splitting fragmentation the broken concrete on presstressed reinforcing steel surface is cleared up, peel off broken concrete and reinforcing bar, expose the step of the removing presstressed reinforcing steel surface concrete of steel strand.
Beneficial effect of the present invention is as follows:
1, adopt equipment such as cutting machine, auger, hydraulic pressure splitting machine to the concrete in the presumptive area cut, boring and hydraulic pressure splitting fragmentation, peel off presstressed reinforcing steel top layer concrete, technological operation is simple, effect is high, cost is low.
2, this worker method is static work, can not produce the vibrations damage to existing structure, and noise is low, dust is few, safety and environmental protection.
Description of drawings
Fig. 1 is construction process figure of the present invention.
The specific embodiment
The principle of the invention is by cutting equipment at the component surface selection area, cuts off nonprestressed reinforcement, removes cage of reinforcement to concrete constraint, forms fracture area; Layout in the fracture area internal drilling, the rifle head of hydraulic pressure splitting machine is put into the hole, the super-pressure that utilizes hydraulic pump to form after splitter amplifies, makes the interior concrete of fracture area by predetermined direction splitting fragmentation; Adopt small-sized air compressor to peel off the broken concrete in presstressed reinforcing steel surface, make presstressed reinforcing steel fully expose the back cutting.The present invention includes following steps:
(1) preparation of construction
1. work out the special scheme of the broken construction of hydraulic pressure split the law, and follow procedure is examined;
2. the special scheme of the bracing frame of removing member is set up in establishment, and follow procedure is examined;
3. operating personnel are confided a technological secret;
4. clear up the job site, guarantee the operating space;
5. debug various operating equipments, guarantee that equipment operation is normal;
6. set up the lower support of removing regional inner member.
(2) determine prestressing force breaking of muscle and tendon muscle point
According to original structure working drawing and constructure scheme, determine the disconnected muscle point of presstressed reinforcing steel in the unbonded prestressed concrete structure.
(3) determine the cutting position and the degree of depth
According to the design drawing requirement, determine the position of the disconnected muscle point of unbonded prestressing tendon, light the zone that strips out steel strand to broken direction extension 800～1000mm (being generally the requirement of satisfying the various device operations space is advisable) conduct from disconnected muscle, regional end is as line of cut.Check drawing, determine depth of cut according to the concrete thickness in unbonded prestressing tendon top layer under the line of cut, purpose is that non-prestressing tendon all cuts off above the steel strand that need are stripped out, and makes this zone form the broken groove that can implement the hydraulic pressure splitting.Depth of cut should suitably reduce 10-20mm than unbonded prestressing tendon top layer concrete thickness under the line of cut, avoids cutting off presstressed reinforcing steel damage equipment or causes other accident.
(4) static(al) cutting non-prestressing tendon
According to the line of cut of putting well, after determining the cutting equipment installation in position, start cutting equipment, begin cutting along an end of line of cut, when reaching the depth of cut of designing requirement, set cutting equipment and carry out horizontal resection, be consistent to guarantee the depth of cut under the line of cut, when cutting is finished, and non-prestressing tendon all is cut off in definite structure, after having reached the purpose that forms broken groove, pull down cutting equipment, for next process is prepared.
(5) hydraulic pressure splitting fragmentation
1. at broken groove open interior: install auger, position, the design hole arrangement diagram according in the constructure scheme carries out perforate in broken zone, and the depth of cut that hole depth rate calculates is suitably deepened 100mm, and the aperture is not less than 46mm.
2. the splitting device is also installed in clear hole: after the broken hole layout in the broken zone, a place is finished, clear up broken hole.According to the instructions for use of hydraulic pressure cleaving device, by the predetermined broken direction of design, will divide head and put into broken hole, connect hydraulic pressure splitting device.
3. hydraulic pressure splitting fragmentation: check that each connects and whether put in place, determine errorless after, the primer fluid pressing system slowly pressurizes until the concrete cracking fragmentation.Because non-prestressing tendon cuts off before broken, so the pressurization of hydraulic pressure cleaving device should not surpass 40MPa, answers hard stop inspection reason as superpressure.
(6) remove presstressed reinforcing steel surface concrete
After the hydraulic pressure splitting fragmentation, the broken concrete on presstressed reinforcing steel surface is cleared up, peeled off broken concrete and reinforcing bar, expose steel strand.
The present invention uses through actual the input, has obtained good effect:
1, dismounting improvement project in Jin Furui shopping square is positioned at opposite, library, South Mountain, Nanshan District, Shenzhen, this project building area 32667.68m
2, six story frame structures, B1 to the primary and secondary beam of roofing layer structural plan is the prestressing without bondn beam, and the about 6100m of structural area is removed and rebuilds in design
2, need put surplus the presstressed reinforcing steel 2500 of opening (cut-outs) piece the about 200m of presstressed reinforcing steel top layer concrete that the need Static crushing is peeled off
3, the improvement project construction is in January, 2010 on-stream time, time of completion is in August, 2010.China Huashi Enterprises Company Limited adopts the hydraulic pressure split the law that presstressed reinforcing steel top layer concrete is carried out fragmentation in construction and peels off, not only saved the construction direct cost significantly, reduced construction costs, simultaneously safety, high-quality, finished set dismounting task apace.This project is safer, more environmental protection, remove unbonded prestressed concrete structure has more quickly accumulated abundant construction experience, has obtained good economic benefit and social benefit.
2, city, garden B﹠Q improvement project is positioned to the north of the east, main road, the She Kou South Sea, Nanshan District, Shenzhen, industrial eight road, and this project is a frame construction, and the about 5200m of structural area is removed and rebuilds in design
2, underground two layers of part girder to three layer construction plane, ground are the prestressing without bondn beam, the about 337.82m of presstressed reinforcing steel top layer concrete that needs Static crushing to peel off
3, improvement project on-stream time is in January, 2010, time of completion is in May, 2010.China Huashi Enterprises Company Limited adopts the hydraulic pressure split the law that presstressed reinforcing steel top layer concrete is carried out fragmentation in construction and peels off, not only saved the construction direct cost significantly, reduced construction costs, simultaneously safety, high-quality, finished set dismounting task apace, obtained good economic benefit and social benefit.
3, everything city PRADA improvement project is positioned at everything city, opposite, library, South Mountain, Luohu District, Shenzhen, and this project is a frame construction, the about 625m of structure of modification area
2, local prestressing without bondn beam needs Static crushing, the about 30m of presstressed reinforcing steel top layer concrete that Static crushing is peeled off
3, improvement project on-stream time is in May, 2009, time of completion is in July, 2009.China Huashi Enterprises Company Limited adopts the hydraulic pressure split the law that presstressed reinforcing steel top layer concrete is carried out fragmentation in construction and peels off, not only saved the construction direct cost significantly, simultaneously safety, high-quality, finished set dismounting task apace, obtained good economic benefit and social benefit.
Removing improvement project with the Jin Furui shopping square below is example, and institute of the present invention recruitment method and conventional construction are compared, and gives prominence to have manifested superiority of the present invention.
11 performance analyses
Removing improvement project with the Jin Furui shopping square is example, and the direct economic benefit analysis of implementing the traditional hand breaking method of the broken contrast of 255 place's concrete sees the following form:
As can be seen, in the engineering of Jin Ruifu shopping square, adopt the hydraulic pressure split the law to compare the hand breaking method and save 256785 yuan of direct costs from above analytical table, the rate of cost reduction reaches 60.66%, and direct economic benefit is considerable.Adopt this worker method to significantly reduce artificial quantity simultaneously, significantly shorten the construction period, reduce overhead cost spending and measure cost spending, adopt this worker method to compare through measuring and calculating with traditional hand breaking method, save about 90 days of duration, duration saves and surpasses 70%, and indirect economic effect is considerable equally, has further improved the overall economic efficiency of this worker method.On the other hand, adopt the construction of this worker method significantly to reduce the dust and the noise pollution of job site, construction equipment only needs the conventional electric power supply to turn round, and reduces and manually faces the limit operation, and safety, environmental protection, energy-conservation have good social benefit.
Claims (3)
1. unbonded prestressing tendon top layer concrete construction method is peeled off in a hydraulic pressure splitting, comprises the preparation process that construction is preceding, it is characterized in that this worker's method is further comprising the steps of:
(1) determines prestressing force breaking of muscle and tendon muscle point
According to original structure working drawing and constructure scheme, determine the disconnected muscle point of presstressed reinforcing steel in the unbonded prestressed concrete structure;
(2) determine the cutting position and the degree of depth
According to the design drawing requirement, determine the position of the disconnected muscle point of unbonded prestressing tendon, light to broken direction extension 800～1000mm as the zone that strips out steel strand from disconnected muscle, the end, zone is as line of cut, determine depth of cut according to the concrete thickness in unbonded prestressing tendon top layer under the line of cut, non-prestressing tendon all cuts off above the steel strand that need are stripped out, and makes this zone form the broken groove that can implement the hydraulic pressure splitting;
(3) static(al) cutting non-prestressing tendon
According to the line of cut of putting well, after determining the cutting equipment installation in position, start cutting equipment, begin cutting along an end of line of cut, when reaching the depth of cut of designing requirement, set cutting equipment and carry out horizontal resection, when cutting is finished, and non-prestressing tendon all is cut off in definite structure, reached the purpose that forms broken groove after, pull down cutting equipment, for next process is prepared;
(4) hydraulic pressure splitting fragmentation
1. at broken groove open interior: install auger, position, the design hole arrangement diagram according in the constructure scheme carries out perforate in broken zone, and the depth of cut that hole depth rate calculates is deepened 100mm, and the aperture is not less than 46mm;
2. the splitting device is also installed in clear hole: after the broken hole layout in the broken zone, a place is finished, clear up broken hole, according to the instructions for use of hydraulic pressure cleaving device, by the predetermined broken direction of design, will divide head and put into broken hole, connection hydraulic pressure splitting device;
3. hydraulic pressure splitting fragmentation: check that each connects and whether put in place, determine errorless after, the primer fluid pressing system slowly pressurizes until the concrete cracking fragmentation.
2. unbonded prestressing tendon top layer concrete construction method is peeled off in hydraulic pressure splitting according to claim 1, it is characterized in that, the preparation process before the described construction comprises:
1. work out the special scheme of the broken construction of hydraulic pressure split the law, and follow procedure is examined;
2. the special scheme of the bracing frame of removing member is set up in establishment, and follow procedure is examined;
3. operating personnel are confided a technological secret;
4. clear up the job site, guarantee the operating space;
5. debug various operating equipments, guarantee that equipment operation is normal;
6. set up the lower support of removing regional inner member.
3. unbonded prestressing tendon top layer concrete construction method is peeled off in hydraulic pressure splitting according to claim 1, it is characterized in that, also comprise after the step of described hydraulic pressure splitting fragmentation the broken concrete on presstressed reinforcing steel surface is cleared up, peel off broken concrete and reinforcing bar, expose the step of the removing presstressed reinforcing steel surface concrete of steel strand.
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Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105155553A (en) * | 2015-09-09 | 2015-12-16 | 杭州江润科技有限公司 | Green dismantling construction method combining concrete support static crush and splitting method |
| CN105696808A (en) * | 2015-12-31 | 2016-06-22 | 上海建工五建集团有限公司 | Reinforced concrete supporting structure and dismantling method |
| CN106906732A (en) * | 2017-03-01 | 2017-06-30 | 尚德建设集团有限公司 | A kind of concrete road surface static(al) abolishes technique |
| CN107034776A (en) * | 2017-03-15 | 2017-08-11 | 武汉二航路桥特种工程有限责任公司 | A kind of restructuring bankrupt of deck paving of concrete |
| CN113668414A (en) * | 2021-08-25 | 2021-11-19 | 北京市政路桥管理养护集团有限公司 | Bridge deck concrete pavement layer dismantling construction method |
| CN114482618A (en) * | 2022-01-05 | 2022-05-13 | 中核华辰建筑工程有限公司 | Construction method for static force demolition of reinforced concrete structure |
| CN115288476A (en) * | 2022-08-01 | 2022-11-04 | 华南农业大学 | Water jet breaking and dismantling method based on pre-cracked concrete structure |
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| US7185954B2 (en) * | 2000-05-15 | 2007-03-06 | Kensuke Asakura | Method and device for removing part of concrete structure |
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- 2010-09-30 CN CN 201010502575 patent/CN101985858A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US7185954B2 (en) * | 2000-05-15 | 2007-03-06 | Kensuke Asakura | Method and device for removing part of concrete structure |
Non-Patent Citations (1)
| Title |
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| 《中华建设》 20081228 曹美俊 跨既有高速公路预应力钢筋混凝土桥梁拆除施工技术 , 第12期 2 * |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105155553A (en) * | 2015-09-09 | 2015-12-16 | 杭州江润科技有限公司 | Green dismantling construction method combining concrete support static crush and splitting method |
| CN105696808A (en) * | 2015-12-31 | 2016-06-22 | 上海建工五建集团有限公司 | Reinforced concrete supporting structure and dismantling method |
| CN106906732A (en) * | 2017-03-01 | 2017-06-30 | 尚德建设集团有限公司 | A kind of concrete road surface static(al) abolishes technique |
| CN107034776A (en) * | 2017-03-15 | 2017-08-11 | 武汉二航路桥特种工程有限责任公司 | A kind of restructuring bankrupt of deck paving of concrete |
| CN113668414A (en) * | 2021-08-25 | 2021-11-19 | 北京市政路桥管理养护集团有限公司 | Bridge deck concrete pavement layer dismantling construction method |
| CN114482618A (en) * | 2022-01-05 | 2022-05-13 | 中核华辰建筑工程有限公司 | Construction method for static force demolition of reinforced concrete structure |
| CN115288476A (en) * | 2022-08-01 | 2022-11-04 | 华南农业大学 | Water jet breaking and dismantling method based on pre-cracked concrete structure |
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Open date: 20110316 |