CN104975570A - Concrete lifting pouring construction method for steel tube arch bridge arch ribs - Google Patents
Concrete lifting pouring construction method for steel tube arch bridge arch ribs Download PDFInfo
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- CN104975570A CN104975570A CN201510409198.3A CN201510409198A CN104975570A CN 104975570 A CN104975570 A CN 104975570A CN 201510409198 A CN201510409198 A CN 201510409198A CN 104975570 A CN104975570 A CN 104975570A
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Abstract
The invention relates to a concrete lifting pouring construction method for steel tube arch bridge arch ribs. The method carries out concrete lifting pouring on the steel tube arch bridge arch ribs through conveying pump selecting, pouring hole arrangement, back pressure hole arrangement, steel tube cleaning, arch rib concrete blending, concrete pumping, discharging of concrete out of back pressure tubes, pumping stopping and concrete detection. Through construction processes and selection of the pouring concrete matching ratio, the self sealing performance and vibration-free performance of a steel tube arch are improved, and the strength of a bridge arch rib structure is increased.
Description
Technical field
The present invention relates to a kind of pouring construction engineering method, particularly a kind of steel pipe arch bridge arch rib concrete jacking casting and constructing engineering method, belongs to bridge construction field of operation.
Background technology
Concrete filled steel tube perfusion is the important procedure of steel pipe arch bridge construction, ensures that the pouring quality of concrete filled steel tube is the key link ensureing that steel pipe concrete arch rib safety is stressed, and there are certain requirements the compensatory requirement of concrete shrinkage also tool.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of steel pipe arch bridge arch rib concrete jacking casting and constructing engineering method, construction process and the selection to concrete perfusion match ratio, improve the performance from close property and without vibration of tubular arch, add the intensity of bridge arch rib structure.
For overcoming the above problems, concrete technical scheme of the present invention is as follows: a kind of steel pipe arch bridge arch rib concrete jacking casting and constructing engineering method, and comprise elephant trunk and build steel pipe, step is as follows:
1), delivery pump is selected: the rated head of delivery pump is greater than 1.5 times of perfusion apical side heights;
2), fill orifice setting: fill orifice aperture is equal with elephant trunk aperture, and is 30 degree of angles with steel pipe axis, and direction upwards;
3), the setting in back-pressure hole: back-pressure hole is set, back-pressure bore dia 100mm, long 1.5m building tubular arch back; For getting rid of laitance and playing back-pressure effect;
4), cleaning steel pipe: by back-pressure pipe, steel pipe is rinsed, building the perforate of steel pipe arch springing simultaneously; Carry out cleaning and lubricating to steel pipe, in the perforate of steel pipe arch springing, by clean for flushing water discharge;
5), arch rib concrete stirs: stir concrete material;
6), pumping of concrete: first pumping 1.5m
3cement bonded sand lubrication piping, then pumping step 5) in stir after concrete, pumping is symmetrical perfusion continuously by building steel pipe arch springing, and pumping is monitored arch springing, 1/4th height, 1/8th height, the change of keystone elevation, arch, position while welding and stress of arch costal change simultaneously;
7), back-pressure pipe discharges concrete: back-pressure pipe can grout after step 6), then continues Pumping concrete, laitance all drained there is grade after stop pumping;
8), stop pumping: close flow-stop valve, stop pumping;
9), concrete NDT: build steel pipe arch springing, L/8, L/4,3L/4, vault and arch rib joint location with the every root of ultrasound examination.
Preferably, in described step 6), concrete pouring squence pours into successively by the order of arch rib, left web and right web on arch rib, right side on arch rib, left side under arch rib, right side under left side.
Preferably, the concrete in described step 5) is made up of coarse aggregate, flat-elongated particles, fines, water reducing agent, micro-expanding agent, second class powered coal ash and retarding agent, and during pumping height 50 ~ 100m, maximum size of coarse aggregate is 1:3 ~ 1:4 with the ratio of caliber; Pumping height, when more than 100m, is 1:4 ~ 1:5, and flat-elongated particles content is less than or equal to 10%, fines adopts medium sand, and be no less than 15% by the sand of 0.315mm sieve aperture, when 10s, relative pressured bleeding is no more than 40%, water/binder ratio is less than 0.35, the slump 16 ~ 22cm.
Preferably, described water reducing agent is FDN type, M type, YJ-2 type or UNF2 type, and water reducing agent addition content is 0.9% ~ 1.2% of cement amount, and micro-expanding agent can select UEA, and incorporation is 10% ~ 20% of cement amount.Add micro-expanding agent to offset concrete shrinkage.
Preferably, described second class powered coal ash is 5% ~ 10% of cement amount.To increase workability, reduce the heat of hydration.
Preferably, the described slump is 18 ~ 20cm.
Preferably, the delivery pump in described step 1) can be set to one-level pumping or secondary pumping.
The beneficial effect that the present invention brings is: because adopting pumping of concrete, and technique shocks for exempting from, and decreases noise pollution and airborne dust to the pollution of surrounding environment.For similar engineering construction provides abundant construction experience and technical indicator, achieve good social benefit and environmental benefit, in whole work progress, the aspect such as quality, safety, progress and cost is all controlled effectively, save engineering cost, shorten the duration, achieve " energy-saving and emission-reduction ", obtain good economic benefit.
Detailed description of the invention
A kind of steel pipe arch bridge arch rib concrete jacking casting and constructing engineering method, comprises elephant trunk and builds steel pipe, it is characterized in that following steps:
1), delivery pump is selected: the rated head of delivery pump is greater than 1.5 times of perfusion apical side heights;
2), fill orifice setting: fill orifice aperture is equal with elephant trunk aperture, and is 30 degree of angles with steel pipe axis, and direction upwards;
3), the setting in back-pressure hole: back-pressure hole is set, back-pressure bore dia 100mm, long 1.5m building tubular arch back;
4), cleaning steel pipe: by back-pressure pipe, steel pipe is rinsed, building the perforate of steel pipe arch springing simultaneously;
5), arch rib concrete stirs: stir concrete material;
6), pumping of concrete: first pumping 1.5m
3cement bonded sand lubrication piping, then pumping step 5) in stir after concrete, pumping is symmetrical perfusion continuously by building steel pipe arch springing, and pumping is monitored arch springing, 1/4th height, 1/8th height, the change of keystone elevation, arch, position while welding and stress of arch costal change simultaneously;
7), back-pressure pipe discharges concrete: back-pressure pipe can grout after step 6), then continues Pumping concrete, laitance all drained there is grade after stop pumping;
8), stop pumping: close flow-stop valve, stop pumping;
9), concrete NDT: build steel pipe arch springing, L/8, L/4,3L/4, vault and arch rib joint location with the every root of ultrasound examination.
Preferably, in described step 6), concrete pouring squence pours into successively by the order of arch rib, left web and right web on arch rib, right side on arch rib, left side under arch rib, right side under left side.
Preferably, the concrete in described step 5) is made up of coarse aggregate, flat-elongated particles, fines, water reducing agent, micro-expanding agent, second class powered coal ash and retarding agent, and during pumping height 50 ~ 100m, maximum size of coarse aggregate is 1:3 ~ 1:4 with the ratio of caliber; Pumping height, when more than 100m, is 1:4 ~ 1:5, and flat-elongated particles content is less than or equal to 10%, fines adopts medium sand, and be no less than 15% by the sand of 0.315mm sieve aperture, when 10s, relative pressured bleeding is no more than 40%, water/binder ratio is less than 0.35, the slump 16 ~ 22cm.
Preferably, described water reducing agent is FDN type, M type, YJ-2 type or UNF2 type, and water reducing agent addition content is 0.9% ~ 1.2% of cement amount, and micro-expanding agent can select UEA, and incorporation is 10% ~ 20% of cement amount.
Preferably, described second class powered coal ash is 5% ~ 10% of cement amount.
Preferably, the described slump is 18 ~ 20cm.
Steel tube arch rib concrete construction will be selected to carry out at normal temperatures, get out giant, tubular arch spray cooling can be given when temperature raises, and prevent from heating up suddenly bringing adverse effect to building, during concrete lift-up, need measure arch rib surface temperature, arch rib concrete pours into arch rib from bottom to top without the need to vibrating by high pressure fixed pump from arch springing pressure injection pipe.When starting pumping, ensure that pump machine is in low speed force feed state, and note observing the pressure of pump and each component working situation, can improve force feed speed after force feed is smooth, the force feed jacking of pumping of concrete will be carried out continuously, avoids termination of pumping as far as possible, when concrete supply is not enough, reduce force feed speed, so as not to interrupt, when concrete transport at need, pump pressure raises, when pipeline produces vibration, cannot force feed by force, need check pipeline, and slow down force feed speed or pump is reversed, with anti-clogging, during force feed concrete, hopper need fill concrete.In concrete transport process, as sucked air, should anti-pump immediately, concrete is withdrawn in hopper, rotating forward is changed into after air to be removed, when delivery pump pipe is blocked, available mallet knocks pipeline, find out the pipeline section of blocking, close backflow proof stop valve, the pipeline section of plugging is dismantled after concrete pump release, take out the concrete foreign material of blocking, and check that all the other pipelines just can be taken over without after blocking, again during force feed concrete, the row pumping again of backflow proof stop valve need be opened, when plasma discharge hole has slurry to discharge, slow down rate of pumping, every pump once needs to stop, until clean concrete overflows, then voltage stabilizing, close backflow proof stop valve.
Above-described is only the preferred embodiments of the present invention.It should be pointed out that for the person of ordinary skill of the art, under the premise without departing from the principles of the invention, some modification and improvement can also be made, also should be considered as belonging to protection scope of the present invention.
Claims (7)
1. a steel pipe arch bridge arch rib concrete jacking casting and constructing engineering method, comprises elephant trunk and builds steel pipe, it is characterized in that following steps:
1) delivery pump is selected: the rated head of delivery pump is greater than 1.5 times of perfusion apical side heights;
2) fill orifice setting: fill orifice aperture is equal with elephant trunk aperture, and is 30 degree of angles with steel pipe axis, and direction upwards;
3) setting in back-pressure hole: back-pressure hole is set, back-pressure bore dia 100mm, long 1.5m building tubular arch back;
4) clean steel pipe: by back-pressure pipe, steel pipe is rinsed, build the perforate of steel pipe arch springing simultaneously;
5) arch rib concrete stirs: stir concrete material;
6) pumping of concrete: first pumping 1.5m
3cement bonded sand lubrication piping, then pumping step 5) in stir after concrete, pumping is symmetrical perfusion continuously by building steel pipe arch springing, and pumping is monitored arch springing, 1/4th height, 1/8th height, the change of keystone elevation, arch, position while welding and stress of arch costal change simultaneously;
7) concrete discharged by back-pressure pipe: back-pressure pipe can grout after step 6), then continues Pumping concrete, laitance all drained there is grade after stop pumping;
8) stop pumping: close flow-stop valve, stop pumping;
9) concrete NDT: build steel pipe arch springing, L/8, L/4,3L/4, vault and arch rib joint location with the every root of ultrasound examination.
2. steel pipe arch bridge arch rib concrete jacking casting and constructing engineering method as claimed in claim 1, is characterized in that: in described step 6), concrete pouring squence pours into successively by the order of arch rib, left web and right web on arch rib, right side on arch rib, left side under arch rib, right side under left side.
3. steel pipe arch bridge arch rib concrete jacking casting and constructing engineering method as claimed in claim 1, it is characterized in that: the concrete in described step 5) is made up of coarse aggregate, flat-elongated particles, fines, water reducing agent, micro-expanding agent, second class powered coal ash and retarding agent, during pumping height 50 ~ 100m, maximum size of coarse aggregate is 1:3 ~ 1:4 with the ratio of caliber; Pumping height, when more than 100m, is 1:4 ~ 1:5, and flat-elongated particles content is less than or equal to 10%, fines adopts medium sand, and be no less than 15% by the sand of 0.315mm sieve aperture, when 10s, relative pressured bleeding is no more than 40%, water/binder ratio is less than 0.35, the slump 16 ~ 22cm.
4. steel pipe arch bridge arch rib concrete jacking casting and constructing engineering method as claimed in claim 3, is characterized in that: described
Water reducing agent is FDN type, M type, YJ-2 type or UNF2 type, and water reducing agent addition content is 0.9% ~ 1.2% of cement amount, and micro-expanding agent can select UEA, and incorporation is 10% ~ 20% of cement amount.
5. steel pipe arch bridge arch rib concrete jacking casting and constructing engineering method as claimed in claim 3, is characterized in that: described second class powered coal ash is 5% ~ 10% of cement amount.
6. steel pipe arch bridge arch rib concrete jacking casting and constructing engineering method as claimed in claim 3, is characterized in that: the described slump is 18 ~ 20cm.
7. steel pipe arch bridge arch rib concrete jacking casting and constructing engineering method as claimed in claim 1, is characterized in that: the delivery pump in described step 1) can be set to one-level pumping or secondary pumping.
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| CN201510409198.3A CN104975570A (en) | 2015-07-14 | 2015-07-14 | Concrete lifting pouring construction method for steel tube arch bridge arch ribs |
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| CN201510409198.3A CN104975570A (en) | 2015-07-14 | 2015-07-14 | Concrete lifting pouring construction method for steel tube arch bridge arch ribs |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107288037A (en) * | 2017-01-20 | 2017-10-24 | 中国建筑第四工程局有限公司 | A kind of base-supporting freely-supported encircles arch rib jacking concrete construction method |
| CN107401122A (en) * | 2017-08-10 | 2017-11-28 | 中国建筑第四工程局有限公司 | A kind of large span freely-supported arch supplies rib concrete lift-up construction technology |
| CN107503286A (en) * | 2017-08-10 | 2017-12-22 | 中国建筑第四工程局有限公司 | A kind of symmetrical jacking self-compacting type concrete tubular arch construction technology |
| CN108708264A (en) * | 2018-05-28 | 2018-10-26 | 广西路桥工程集团有限公司 | A kind of multi-stage construction method of Long-Span Concrete Filled Steel Tubular Arch Bridges filling concrete |
| CN109577205A (en) * | 2018-11-28 | 2019-04-05 | 中铁十四局集团第工程发展有限公司 | A kind of 180m long-span Steel Arch casting method |
| CN113279333A (en) * | 2021-05-18 | 2021-08-20 | 中电建十一局工程有限公司 | Construction method for filling concrete in steel pipe arch bridge |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107288037A (en) * | 2017-01-20 | 2017-10-24 | 中国建筑第四工程局有限公司 | A kind of base-supporting freely-supported encircles arch rib jacking concrete construction method |
| CN107401122A (en) * | 2017-08-10 | 2017-11-28 | 中国建筑第四工程局有限公司 | A kind of large span freely-supported arch supplies rib concrete lift-up construction technology |
| CN107503286A (en) * | 2017-08-10 | 2017-12-22 | 中国建筑第四工程局有限公司 | A kind of symmetrical jacking self-compacting type concrete tubular arch construction technology |
| CN108708264A (en) * | 2018-05-28 | 2018-10-26 | 广西路桥工程集团有限公司 | A kind of multi-stage construction method of Long-Span Concrete Filled Steel Tubular Arch Bridges filling concrete |
| CN109577205A (en) * | 2018-11-28 | 2019-04-05 | 中铁十四局集团第工程发展有限公司 | A kind of 180m long-span Steel Arch casting method |
| CN113279333A (en) * | 2021-05-18 | 2021-08-20 | 中电建十一局工程有限公司 | Construction method for filling concrete in steel pipe arch bridge |
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