CN104264676A - Construction method of mass concrete of high-rise building foundations - Google Patents
Construction method of mass concrete of high-rise building foundations Download PDFInfo
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- CN104264676A CN104264676A CN201410526133.2A CN201410526133A CN104264676A CN 104264676 A CN104264676 A CN 104264676A CN 201410526133 A CN201410526133 A CN 201410526133A CN 104264676 A CN104264676 A CN 104264676A
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
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Abstract
The invention discloses a construction method of mass concrete of high-rise building foundations. According to the construction method, continuous construction is adopted for concrete construction, concrete is subject to segmental and layered casting and mechanical vibrating, and the temperature and the casting time are strictly controlled. The construction method is simple in technique, high in site construction efficiency, reliable in quality, short in construction period and low in labor intensity, the quality after construction reaches the design demands, and the thickness of casting layers is strictly controlled. Vibrators are arranged at multiple casting points to ensure density of the concrete. The opening temperature and the molding temperature of the concrete are strictly controlled so that shrinkage and closing of the concrete are effectively ensured. The concrete is vibrated in a fast inserting and slow stirring mode during casting so that holes caused by mixing of air during concrete casting are effectively prevented.
Description
Technical field
The present invention relates to concrete construction method, specifically Construction technology for crack controlling in works of aerated method.
Background technology
At present, along with developing rapidly of economic construction scale, modern architecture industry is expanded towards high, large, dark and labyrinth direction, wherein often relate to concrete in mass, as highrise building or large equipment base, the super thick super large cushion cap of pile foundation, hydro-structure etc.Its main feature is that volume is large, and hydrated cementitious heat is large, very easily causes concrete to ftracture more than 25 DEG C due to inside and outside temperature difference, affects the safe handling of structure, extends the construction period.Construction treating methods is not very desirable in the prior art at present, and modern high-rise building development is rapid, and the application of large volume concrete structural in highrise building is general all the more.Mass concrete construction is a difficult point in building engineering construction, is also emphasis, if its construction control is bad, structure just likely produces crack, directly threatens the safety of building structure, durability.Therefore, highrise building massive concrete construction control is the most important thing, must take effective measures and control, and prevents structure from occurring crack.
Summary of the invention
The object of the present invention is to provide Construction technology for crack controlling in works of aerated method, to solve the difficult problem in Building Construction in Mass Concrete, thus guarantee construction safety and construction quality, and overcome the deficiencies in the prior art.
In order to solve background technology problem, the present invention by the following technical solutions: Tall Building Foundation concrete in mass method of quality control, comprises operating procedure:
1) front preparation is built
Lay-up operation passage and material cleaning: bed board, adapter, pump line must firmly set up, feed-line should be straight, turning should be delayed, joint should be tight, and concrete outlet place will establish the horizontal tube of certain length, arbitrarily tramples reinforcing bar and reinforcing bar displacement for preventing operation, reinforcement foundation is laid the passage of scaffold as constructor's operating time, should clean out the foreign material in template and the greasy dirt etc. on reinforcing bar;
C elevation control: copied absolute altitude control line in advance on wall, post reinforcing bar, to absolute altitude priority controls such as sumps, so that levelling at any time, the correctness of elevation control, when concrete is built, construction survey personnel will carry out school survey to the absolute altitude on reinforcing bar at any time, correct at any time.
2) concreting
Construction technology: continuity is constructed, and staged and layered is built, and machinery vibrates.
A is because of raft board concrete thickness 1200-1400mm, and when constructing operation, each height of lift height pattern controls at 400-500mm, can grey mouth and near mark is set, the lighting that the Shi Yingyou that carries on construction work at night is enough;
During b concreting must first by the deep foundation ditch such as elevator shaft, collecting well position, build and when flushing bottom raft plate, could start to build the mixed soil of large area;
C per tour arranges an operation group, and is equipped with 5 workmans of vibrating, and according to natural grade during concrete pumping, arrange three road vibrators in each front and back of building a little, first is arranged in concrete emptying point, solves the concrete tamping in top, second is arranged in concrete toe place, 3rd road is arranged on centre, guarantee concrete closely knit, except the dense place of reinforcing bar adopts oblique vibrating, other positions all adopt vertically vibrates, a distance of vibrating is 300mm ~ 400mm, blossom type is arranged, when vibrating, pointwise is moved, order is not more than 200mm apart from template, in concreting process, cold seam is not produced in order to make levels, upper layer concrete should complete before lower-layer concrete, and insert 50mm under vibrating spear, take fast slotting principle of pulling out slowly, prevent first by upper layer concrete jolt ramming, and lower-layer concrete bubble cannot be discharged, and vibrating spear is twitched slightly up and down, make vibration compacting.Vibrating time controls unsuitable long, till when going out laitance with surface and no longer sink;
D, concrete should strictly control opening temperature and molding temperature, and opening temperature should control on 10 DEG C, and molding temperature should control more than 5 DEG C, during concrete pumping, note residual concrete in hopper not being reduced to below 200mm, in order to avoid suck air, pumping of concrete is after eliminating bleeding and laitance, surface still has thick cement mortar, after concreting, strikes off by the long floating rule of absolute altitude, make real with wood float rubbing and pressure, before close to final set, use wood float press polish, shrinkage crack is closed;
E, in casting process, must control off time well, upper layer concrete should be built complete before lower-layer concrete initial set, was generally not more than 2.5h.
F, pump truck uniform distribution in the same direction, the cloth gradient and the laminated pouring gradient are 1:6, and push ahead by this gradient, to reduce concrete temperature, reduce thermal stresses to the impact of concrete in mass.Pumping midway idle hours then must pigging as exceeded not more than 60min.G, in casting process, must strictly by operational procedure operation, accomplish fast to insert slow dialling, fast inserting is to prevent after upper layer concrete jolt ramming bubble in lower-layer concrete to discharge; Slow dialling is the cavity of causing in order to concrete can be made to fill up rod, and in the process of vibrating, vibrating spear is twitched slightly up and down, make concrete vibrating closely knit, insert point and want evenly, insert point and want evenly, insert distance controlling between point and, at 20-30cm, in the process of vibrating, reinforcing bar, template must not be touched.
The beneficial effect that the present invention has: the technology of the present invention is simple; site operation efficiency is high; reliable in quality; construction period is short; labor force is low; quality after construction reaches designing requirement; strictly control height of lift height pattern well; vibrator is set building a many places; guarantee concrete compaction, the concrete opening temperature of strict control and molding temperature, effectively ensure that concrete shrinkage closes; in casting process, the fast group mode slowly of inserting of employing is vibrated, and effectively prevent concrete in casting process, is mixed into air generation cavity.
Detailed description of the invention
Construction technology for crack controlling in works of aerated method, comprises operating procedure:
1) front preparation is built
A bed board, adapter, pump line must firmly set up, feed-line should be straight, turning should be delayed, joint should be tight, and concrete outlet place will establish the horizontal tube of certain length, arbitrarily tramples reinforcing bar and reinforcing bar displacement for preventing operation, reinforcement foundation is laid the passage of scaffold as constructor's operating time, should clean out the foreign material in template and the greasy dirt etc. on reinforcing bar;
B elevation control: copied absolute altitude control line in advance on wall, post reinforcing bar, to absolute altitude priority controls such as sumps, so that levelling at any time, the correctness of elevation control.When concrete is built, construction survey personnel will carry out school survey to the absolute altitude on reinforcing bar at any time, correct at any time.
2) concreting
Construction technology: continuity is constructed, and staged and layered is built, and machinery vibrates.
A is because of raft board concrete thickness 1300mm, and when constructing operation, each height of lift height pattern controls at 450mm, can grey mouth and near mark is set, the lighting that the Shi Yingyou that carries on construction work at night is enough;
During b concreting must first by the deep foundation ditch such as elevator shaft, collecting well position, build and when flushing bottom raft plate, could start to build the mixed soil of large area;
C arranges an operation group, and every assembly is for 5 workmans of vibrating, and according to natural grade during concrete pumping, arrange three road vibrators in each front and back of building a little, first is arranged in concrete emptying point, solves the concrete tamping in top, second is arranged in concrete toe place, 3rd road is arranged on centre, guarantee concrete closely knit, except the dense place of reinforcing bar adopts oblique vibrating, other positions all adopt vertically vibrates, a distance of vibrating is 400mm, vibrate and a little arrange in blossom type, when vibrating, pointwise is moved, order is 250mm apart from template, in concreting process, cold seam is not produced in order to make levels, upper layer concrete should complete before lower-layer concrete, and insert 50mm under vibrating spear, take fast slotting principle of pulling out slowly, prevent first by upper layer concrete jolt ramming, and lower-layer concrete bubble cannot be discharged, and vibrating spear is twitched slightly up and down, make vibration compacting.Vibrating time controls unsuitable long, till when going out laitance with surface and no longer sink;
D commercial concrete should strictly control opening temperature and molding temperature, and opening temperature should control at 15 degree, and molding temperature should control at 8 degree, during concrete pumping, the concrete liquid level in maintenance hopper is at 220mm, in order to avoid suction air, pumping of concrete is after eliminating bleeding and laitance, surface still has thick cement mortar, after concreting, strikes off by the long floating rule of absolute altitude, make real with wood float rubbing and pressure, before close to final set, use wood float press polish, shrinkage crack is closed;
E is in casting process, and in control, layer concrete should be built complete before lower-layer concrete initial set, and the time of building is 3h;
F pump truck uniform distribution in the same direction, the cloth gradient and the laminated pouring gradient are 1:6, and push ahead by this gradient, to reduce concrete temperature, reduce thermal stresses to the impact of concrete in mass;
G is in casting process, and vibrating is an important step, must strictly by operational procedure operation.Accomplish fast to insert slow dialling, fast inserting is to prevent after upper layer concrete jolt ramming bubble in lower-layer concrete to discharge; Slow dialling is the cavity of causing in order to concrete can be made to fill up rod.In the process of vibrating, vibrating spear is twitched slightly up and down, makes concrete vibrating closely knit, inserts point and wants evenly, inserts point and wants evenly, inserts distance controlling between point and, at 25cm, in the process of vibrating, must not touch reinforcing bar, template.
Claims (4)
1. Construction technology for crack controlling in works of aerated method, is characterized in that comprising operating procedure:
1) front preparation is built
A, lay-up operation passage and material are cleared up;
Absolute altitude is built in B, control;
2) concreting
A, concrete thickness control at 1200-1400mm, and when constructing operation, every layer of height of lift height pattern controls at 400-500mm;
When B, concreting first by the deep foundation ditch such as elevator shaft, collecting well position, build and start to build large area concrete with when flushing bottom raft plate;
C, according to natural grade during concrete pumping, arrange three road vibrators in each front and back of building a little;
D, concrete control opening temperature and molding temperature, opening temperature is not less than 10 DEG C, molding temperature is not less than 5 DEG C, when concrete pump is carried, keep the concrete liquid level in hopper to be not less than 200mm, after concreting, concrete surface is struck off, before close to final set, use wood float press polish;
E, in casting process, upper layer concrete should be built complete before lower-layer concrete initial set, built and was not more than 2.5h;
F, pump truck evenly lay cloth in the same direction in the gradient, and by this gradient push ahead pumping midway idle hours be not more than 60min;
G, in casting process, vibrating spear is twitched slightly up and down, and slotting point control of vibrating is even, and to insert between some distance controlling at 20cm-30cm.
2. according to claim 1, it is characterized in that: described lay-up operation passage and material cleaning are: bed board, adapter, pump line firmly sets up, concrete outlet place establishes horizontal tube, reinforcement foundation is laid scaffold as constructor's operating time passage, should clean out the foreign material in template and the greasy dirt etc. on reinforcing bar;
Absolute altitude is built in described control: on wall, post reinforcing bar, copied absolute altitude control line in advance, and to absolute altitude priority controls such as sumps, the correctness of elevation control, when concrete is built, construction survey personnel will carry out school survey to the absolute altitude on reinforcing bar at any time.
3. Construction technology for crack controlling in works of aerated method according to claim 1, is characterized in that: the described position of building a little is respectively: first is arranged in concrete emptying point, and second is arranged in concrete toe place; 3rd road is arranged in the middle of concrete, except the dense place of reinforcing bar adopts oblique vibrating, other positions all adopt vertically vibrates, a distance of vibrating is 300mm-400mm, and the some layout in blossom type of vibrating, when vibrating, pointwise is moved, and order is not more than 200mm apart from template, till vibrating when going out laitance with surface and no longer sink.
4. Construction technology for crack controlling in works of aerated method according to claim 1, is characterized in that: cloth gradient ratio laid by pump truck is 1:6.
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| CN201410526133.2A CN104264676A (en) | 2014-09-25 | 2014-09-25 | Construction method of mass concrete of high-rise building foundations |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105569044A (en) * | 2015-12-17 | 2016-05-11 | 江苏建筑职业技术学院 | Post-pouring mass concrete construction method |
| CN106400824A (en) * | 2016-09-26 | 2017-02-15 | 中建八局第四建设有限公司 | Method for landfill of large-diameter water well |
| CN107190764A (en) * | 2017-04-29 | 2017-09-22 | 中国能源建设集团安徽电力建设第工程有限公司 | A kind of booster stations building foundation construction method |
| CN108755692A (en) * | 2018-06-14 | 2018-11-06 | 孙德山 | Underground structure concrete casting method |
| CN109267580A (en) * | 2018-10-10 | 2019-01-25 | 四川理工学院 | A kind of steel bar combined structure and casting method of concrete |
| CN109854051A (en) * | 2019-01-29 | 2019-06-07 | 中建三局第二建设工程有限责任公司 | A kind of large-sized concrete earthing tank segmentation casting method |
| CN110374127A (en) * | 2019-07-31 | 2019-10-25 | 中国三冶集团有限公司 | A kind of huge foundation construction of bottom plates method and constructing structure |
| CN110805279A (en) * | 2019-09-26 | 2020-02-18 | 陈树 | High-rise building lightweight concrete construction method |
| CN112343344A (en) * | 2020-09-16 | 2021-02-09 | 上海宝冶冶金工程有限公司 | Construction method of low-hydration-heat concrete |
| CN115506396A (en) * | 2022-09-21 | 2022-12-23 | 上海二十冶建设有限公司 | Foundation subsection construction method for main body equipment of continuous casting machine |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105569044A (en) * | 2015-12-17 | 2016-05-11 | 江苏建筑职业技术学院 | Post-pouring mass concrete construction method |
| CN106400824A (en) * | 2016-09-26 | 2017-02-15 | 中建八局第四建设有限公司 | Method for landfill of large-diameter water well |
| CN107190764A (en) * | 2017-04-29 | 2017-09-22 | 中国能源建设集团安徽电力建设第工程有限公司 | A kind of booster stations building foundation construction method |
| CN108755692A (en) * | 2018-06-14 | 2018-11-06 | 孙德山 | Underground structure concrete casting method |
| CN109267580A (en) * | 2018-10-10 | 2019-01-25 | 四川理工学院 | A kind of steel bar combined structure and casting method of concrete |
| CN109854051A (en) * | 2019-01-29 | 2019-06-07 | 中建三局第二建设工程有限责任公司 | A kind of large-sized concrete earthing tank segmentation casting method |
| CN110374127A (en) * | 2019-07-31 | 2019-10-25 | 中国三冶集团有限公司 | A kind of huge foundation construction of bottom plates method and constructing structure |
| CN110805279A (en) * | 2019-09-26 | 2020-02-18 | 陈树 | High-rise building lightweight concrete construction method |
| CN112343344A (en) * | 2020-09-16 | 2021-02-09 | 上海宝冶冶金工程有限公司 | Construction method of low-hydration-heat concrete |
| CN115506396A (en) * | 2022-09-21 | 2022-12-23 | 上海二十冶建设有限公司 | Foundation subsection construction method for main body equipment of continuous casting machine |
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