CN102535493B - Method for constructing inverted type foundation beam - Google Patents
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- CN102535493B CN102535493B CN 201210008648 CN201210008648A CN102535493B CN 102535493 B CN102535493 B CN 102535493B CN 201210008648 CN201210008648 CN 201210008648 CN 201210008648 A CN201210008648 A CN 201210008648A CN 102535493 B CN102535493 B CN 102535493B
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Abstract
The invention discloses a method for constructing an inverted type foundation beam. The method comprises the following steps of: (1) carrying out earthwork excavation and construction: (11) excavating to the position of a marked elevation on the bottom of a raft plate by using a machine, and leaving soil with the thickness of 200 mm for manual shoveling, (12) releasing an axis in time after the axial excavated soil of foundation ditches 1-7 reaches the marked elevation, and manually excavating a beam groove; (2) carrying out waterproofing work; (3) binding reinforced steel bars and putting the reinforced steel bars in the groove; and (4) carrying out concrete pouring and curing. With the adoption of the method disclosed by the invention, the bearing capacity of foundation can be ensured, the occurrence of uneven settlement of a building, caused by construction quality is prevented, and meanwhile, the method is easy in on-site construction.
Description
Technical field
The present invention relates to a kind of job practices of inversion type grade beam, belong to construction engineering technical field.
Background technology
The superstructure rigidity of inversion type grade beam is better; No soft layer, liquefiable soil layer or serious inhomogeneous soil layer in the ground compression layer scope; The line rigidity of the grade beam of strip foundation under columns is greater than 3 times of post line rigidity; Simultaneously each post post apart from be more or less the same and loading ratio more even, the substrate counter-force can distribute by straight line and consider, so the inversion type grade beam extensively obtains the use on some buildings bases.But also do not have the method for standard for the construction of large-scale inversion type grade beam, especially satisfying under the prerequisite that stress intensity requires, can be easy to construction, the method that cost is low more awaits further research.
Summary of the invention
Technical problem to be solved by this invention provides a kind of job practices of inversion type grade beam, guarantees bearing capacity of foundation soil, and the appearance of the differential settlement of buildings that prevents to cause because of construction quality is easy to site operation simultaneously.
For solving the problems of the technologies described above, the present invention provides a kind of job practices of inversion type grade beam, it is characterized in that, may further comprise the steps:
1) soil excavation construction:
11) absolute altitude position at the bottom of employing mechanical equivalent of light excavation to the raft plate plate, and it is native as artificial shovel to leave the thick soil of 200mm;
12) cut the earth to absolute altitude when foundation ditch, in time discharge axis, carry out manual work and dig the beam groove;
2) carry out waterproofing work: after the brick loose tool construction, in time shovel the clear groove in the end, carry out the whitewashing and the construction of waterproofing course of construction, body of wall of cushion layer concrete; Waterproofing course adopts waterproof coating JS; Repeatedly brushing thickness reach 1.5mm thick after, carry out cement mortar (weight ratio water: cement: sand=1:1:5) whitewash, treat the rendering layer drying after; Carrying out the thick SBS modified bituminous pitch coiled material of 3mm hot melt again connects; In the work progress waterproofing course layering is checked and accepted, after the acceptance(check), in time carried out the construction of C20 pea gravel concreten topping;
3) reinforcing bar binding with go into groove:
31) dark case bay is made as 3.6m, and the dark 1500-2100mm of beam ties up earlier during colligation and pricks plate muscle, Zha Qiang and draw reinforcing bar again behind the curb girder;
32) adopt the high strapping of frame, promptly the load according to beam calculates before colligation, confirms the spacing of support tube, carries out the frame pipe and sets up, and then carry out colligation;
33) after the beam colligation finishes veritification, beam is transferred in place;
4) carry out concreting and maintenance.
The job practices of aforesaid inversion type grade beam; It is characterized in that: in said step 12); For making grade beam groove excavation size accurate; Utilize the well-points dewatering pipe establish at-3.5m absolute altitude place one hand over circle the axis cross bar, every little axis delineation in is convenient in the excavation that backguy in time inspection is excavated the position and whether size accurate.
The job practices of aforesaid inversion type grade beam is characterized in that: in said step 12), beam groove excavation is of a size of deck-siding+loose tool wall thickness+whitewash bed thickness, and the detailed process of beam groove excavation is:
A) in time execute, put the dirt line, all follow closely paxilla, draw logical line to cut the earth in the beam both sides;
When b) cutting the earth, the every side of beam is stayed 10mm, end mark to reserve and is shoveled soil before 50mm builds as bed course;
When c) cutting the earth to absolute altitude, check once more axis errorless after, extend out and repair shovel about 8mm;
D) repair shovel finish put in place after, adopt and to spend skin cloth to cover, prevent to rain;
E) timely segmentation check of foundation subsoil;
F) check of foundation subsoil qualified after, in time build the brick loose tool by laying bricks or stones, gapped between the brick and the soil body when building the brick loose tool by laying bricks or stones, with building, guarantee between soil and brick closely knit with the cementation of fissures.
The job practices of aforesaid inversion type grade beam is characterized in that: in said step 32) in, before beam is gone into groove, at the bottom of beam and the colligation of beam side, the topping cushion block of clamped beam.
The job practices of aforesaid inversion type grade beam is characterized in that: in said step 33) in, adopt the downslide method in place; Promptly whenever unscrew fastener, let and tighten behind the little cross bar downslide 150mm, unscrew remaining little cross bar fastener then at a distance from a vertical rod; Let the reversed beam muscle in slip under the deadweight effect of reinforcing bar to the little cross bar that glides earlier, with the little cross bar of this decline 150mm that descends again, fastener is tightened then; Unscrew the little cross bar that descends for the first time, let the reversed beam muscle rest on the little cross bar that descends for the second time, little cross bar continues decline 150mm; Fastener is tightened, repeated above-mentioned steps, sink to bottom land until beam.
The job practices of aforesaid inversion type grade beam is characterized in that: carrying out adopting slide calliper rule spacing when reinforcing bar binding connects, be provided with breach according to rebar spacing, during colligation at the two ends of reinforcing bar with slide calliper rule breach screens reinforcing bar, treat to take out slide calliper rule after the colligation.
The job practices of aforesaid inversion type grade beam is characterized in that: in said step 4), may further comprise the steps:
(1) selecting concrete strength grade for use is C30, impervious grade S6; The moistening template of watering before the concreting, cleaning foreign material, ponding after-pouring;
(2) control between each layer concrete and surperficial idle hours;
(3) behind the casting and compacting of concrete, tentatively wipe off by design elevation, roll several times with cylinder before the initial set, with the polishing of wood card, compacting, prevent that shrinkage crack from appearring in the surface again with floating rule;
(4) cleaning constuction joint before concrete wall support, the adjustment spacing is also cleared up the rebar surface foreign material, and water moistening template, constuction joint are used before building with the moistening concrete surface of label cement mortar;
(5) vibratory equipment adopts immersion vibrator, adopts the method for vertically vibrating, and when vibrating wall, inserts 50mm in the lower floor during upper strata; To eliminate the cold seam between two-layer, should avoid colliding reinforcing bar, built-in fitting when vibrating, every some vibrating time is 20-30s; Look concrete surface no longer significantly sinks, no longer bubble occurs, surperficial bleeding is as the criterion; At the service sleeve place, vibrate from a side of sleeve pipe, the concrete bubble is discharged from a side.
The job practices of aforesaid inversion type grade beam is characterized in that: in said step 4), the concrete strength of on constuction joint, building reaches 2N/m
2The time, constuction joint is handled, eliminate the more weak layer of concrete of the loosening sandstone in rubbish surface; Cut a hole simultaneously hair, water is rinsed well and is fully moistening, will remain in concrete surface and ponding and remove; Shop one deck 10-15mm solid cement mortar before pouring construction is sewed on concrete, the constuction joint place is with wide 300mm, 3m steel plate waterstop, and the steel plate water-stopping band rests on the beam muscle; Underground bottom slab concreting to external wall steel plate water-stopping band end opening 150mm place adopts the single face full weld during steel plate water-stopping band spreading, the reinforcing bar point is welded on the wallboard muscle; Dot interlace weldering between the upper and lower guarantees steel plate water-stopping band absolute altitude and axial location.The beneficial effect that the present invention reached:
The job practices of inversion type grade beam of the present invention through above-mentioned steps, can guarantee bearing capacity of foundation soil, and the appearance of the differential settlement of buildings that prevents to cause because of construction quality is easy to site operation simultaneously.
The specific embodiment
The job practices of inversion type grade beam of the present invention is described with a specific embodiment below.Engineering foundation is a raft foundation inversion type grade beam, the thick 400mm of base plate, and basic deck-molding 1500-2100mm, absolute altitude-4.9m at the bottom of the plate, bosom absolute altitude-6.4m at the bottom of the beam, groundwater table adopts the secondary well-points dewatering about 1.5m.
1) ground works
Foundation excavation adopts absolute altitude position at the bottom of mechanical heavy excavation to the raft plate plate, and has 200 thick soil to give over to artificial shovel soil.Cut the earth to absolute altitude when 1-7 of foundation ditches, in time discharge axis, carry out manual work and dig the beam groove, for making grade beam groove excavation size accurate, utilize the well-points dewatering pipe establish at-3.5m absolute altitude place one hand over circle the axis cross bar, every little axis in the delineation.Whether the inspection of backguy in time excavation position and size be accurate in being convenient to like this excavate.Beam groove excavation is of a size of deck-siding+loose tool wall thickness+whitewash bed thickness.Because of beam is 1500-2100mm deeply, the brick loose tool adopts 120 thick brick walls, so that the excavation size is difficult for is excessive, otherwise backfilling compaction can increase the lateral pressure of one brick wall, is prone to decay, and narrow need repair shovel again, and increasing workload influences construction quality.
Concrete beam groove excavation method is:
A) in time execute, put the dirt line, all follow closely paxilla, draw logical line to cut the earth in the beam both sides;
When b) cutting the earth, the every side of beam must be stayed 10mm, end mark must reserve 50mm and build preceding shovel soil as bed course;
When c) cutting the earth to absolute altitude, check once more axis errorless after, extend out and repair shovel about 8mm;
D) repair shovel finish put in place after, adopt and to spend skin cloth to cover, prevent to rain;
E) timely segmentation check of foundation subsoil;
F) check of foundation subsoil qualified after, in time build the brick loose tool by laying bricks or stones.When building the brick loose tool by laying bricks or stones, the gap of the 8mm that has an appointment between the brick and the soil body with building with the cementation of fissures, is guaranteed between soil and brick closely knit.
After taking above-mentioned measure, guaranteed that soil layer does not receive disturbance, tight between the brick loose tool and the soil body guarantees the bearing capacity on basis, has improved the construction quality of engineering, the phenomenon that avoid backbreaking backfill and body of wall decay and do over again.
2) waterproofing work process
After the brick loose tool construction, in time shovel the clear groove in the end, carry out the whitewashing and the construction of waterproofing course of construction, body of wall of cushion layer concrete.Waterproofing course adopts waterproof coating JS, repeatedly brushing thickness reach 1.5mm thick after, carry out the 1:1:5 cement mortar and whitewash, treat the rendering layer drying after, carry out the thick SBS modified bituminous pitch coiled material of 3mm hot melt again and connect.In the construction waterproofing course layering is checked and accepted, in time carried out hiding work, after supervising engineer's acceptance(check), in time carry out the construction of C20 pea gravel concreten topping.
3) reinforcing bar binding and go into groove
31) basement bottom board is the integral planar plated construction, and dark case bay is about 3.6m, the dark 1500-2100mm of beam, tie up earlier during colligation prick behind the curb girder plate muscle, again Zha Qiang, draw reinforcing bar.
32) owing to be the inversion type grade beam, pressing conventional method can't colligation, can only adopt the high strapping of frame, and promptly the load according to beam calculates before colligation, confirms the spacing of support tube, carries out the frame pipe and sets up, and then carry out colligation.
33) the beam colligation finishes, and after must veritifying, can beam be transferred in place.
34) adopt the downslide method in place, promptly whenever unscrew fastener, let and tighten behind the little cross bar downslide 150mm at a distance from a vertical rod; Unscrew remaining little cross bar fastener then, let the reversed beam muscle in slip under the deadweight effect of reinforcing bar to the little cross bar that glides earlier, with the little cross bar of this decline 1 50mm that descends again, fastener is tightened then; Unscrew the little cross bar that descends for the first time, let the reversed beam muscle rest on the little cross bar that descends for the second time, little cross bar continues decline 150mm, and fastener is tightened.
35) carry out in regular turn, repeat a step, sink to bottom land until beam.
36) before beam is gone into groove, must be at the bottom of beam and the colligation of beam side, the topping cushion block of clamped beam avoids beam back in place to do over again because of topping is irregular.
37) raft slab muscle is Ф 14 double-layer double-directions 1 50, for making slab muscle spacing accurate, is carrying out reinforcing bar binding; Adopt the long slide calliper rule of 3m spacing during connection; Be provided with breach according to rebar spacing, during colligation at the two ends of reinforcing bar with slide calliper rule breach screens reinforcing bar, treat to take out slide calliper rule after the colligation; Can satisfy the rebar spacing requirement, accelerate colligation speed again.
38) the main muscle of this engineering foundation beam is Ф 22, Ф 25, Ф 28, for guaranteeing workmanship, speeds up the work, and practices thrift steel, joint all adopts the straight thread mechanical connection, and grade is the A level, with the cover seal cover, and connects mark with processing.Adhere to during construction that next seal cover connects the sequence of construction of a root reinforcing bar, avoids screw thread impaired.
4) concrete construction
In the present embodiment, foundation construction area 2400m
2, sole plate 0.4m is thick, basic deck-molding 2.1-0.45m, and concrete strength grade is C30, impervious grade S6.
41) carry out Mix Ratio Test, confirm match ratio, measure on-the-spot sandstone water content, adjustment construction match ratio.
42) be equipped with 3 ZJ500 mixers.Concrete adopts the conveying of HBT-60 delivery pump, tower crane transportation.For satisfying the needs that vibrate, adopt seven vibrators, three cooperation delivery pumps vibrate, and two cooperation tower cranes vibrate, wall concrete under waterstop.
43) concrete should keep its homogeneity in transportation, accomplish not stratified, do not emanate, spillage not, keep the workability and the slump preferably.
44) concreting
(1) the moistening template of watering before the concreting is conscientiously cleared up foreign material, ponding, after-pouring.
(2) control each layer concrete and ask about surperficial idle hours.
(3) because the mass concrete surface cement mortar is thicker, must handle behind the casting and compacting of concrete, tentatively wipe off by design elevation, roll several times with cylinder before the initial set, with the polishing of wood card, compacting, prevent that shrinkage crack from appearring in the surface again with floating rule.
(4) concrete wall must conscientiously be cleared up constuction joint before supporting, and the adjustment spacing is also cleared up the rebar surface foreign material, and water moistening template, constuction joint are used before building with the moistening concrete surface of label cement mortar.
(5) vibratory equipment adopts immersion vibrator, adopts the method for vertically vibrating, and when vibrating wall, should insert 50mm in the lower floor during upper strata; To eliminate the cold seam between two-layer, should avoid colliding reinforcing bar, built-in fitting etc. when vibrating as far as possible, every some vibrating time is 20-30s; Look concrete surface no longer significantly sinks, no longer bubble occurs, surperficial bleeding is as the criterion; At the service sleeve place, vibrate from a side of sleeve pipe, the concrete bubble is discharged from a side.
The concrete strength of (6) on constuction joint, building reaches 2N/m
2The time, constuction joint is handled, eliminate the more weak layer of concrete of the loosening sandstone in rubbish surface; Cut a hole simultaneously hair, water is rinsed well and is fully moistening, will remain in concrete surface and ponding and remove; Shop one deck 10-15mm solid cement mortar before pouring construction is sewed on concrete, the constuction joint place is with wide 300mm, 3m steel plate waterstop, and the steel plate water-stopping band rests on the beam muscle; Underground bottom slab concreting to external wall steel plate water-stopping band end opening 150mm place adopts the single face full weld during steel plate water-stopping band spreading, the reinforcing bar point is welded on the wallboard muscle; Dot interlace weldering between the upper and lower guarantees steel plate water-stopping band absolute altitude and axial location.
45) concrete curing
Concrete curing is the key that guarantees concrete quality.After the concrete final set, maintenance in time.Concrete floor adopts water storing conservation, and the depth of water is 50mm at least, and time 1 4d at concrete wall surface thin film, one deck straw screen or mat, sends special messenger's water seasoning, and curing time is about 1 4d.
46) detect the slump at least once according to the every shift of every machine of code requirement, in time carry out the indwelling work of test block.
Claims (7)
1. the job practices of an inversion type grade beam is characterized in that, may further comprise the steps:
1) soil excavation construction:
11) absolute altitude position at the bottom of employing mechanical equivalent of light excavation to the raft plate plate, and it is native as artificial shovel to leave the thick soil of 200mm;
12) cut the earth to absolute altitude when foundation ditch, in time discharge axis, carry out manual work and dig the beam groove;
2) carry out waterproofing work: after the brick loose tool construction, in time shovel the clear groove in the end, carry out the whitewashing and the construction of waterproofing course of construction, body of wall of cushion layer concrete; Waterproofing course adopts waterproof coating JS, repeatedly brushing thickness reach 1.5mm thick after, carry out cement mortar and whitewash; After treating the rendering layer drying, carry out the thick SBS modified bituminous pitch coiled material of 3mm hot melt again and connect, in the work progress waterproofing course layering is checked and accepted; After the acceptance(check), in time carry out the construction of C20 pea gravel concreten topping;
3) reinforcing bar binding with go into groove:
31) dark case bay is made as 3.6m, the dark 1500-2100mm of beam, tie up earlier during colligation prick behind the curb girder plate muscle, again Zha Qiang, draw reinforcing bar;
32) adopt the high strapping of frame, promptly the load according to beam calculates before colligation, confirms the spacing of support tube, carries out the frame pipe and sets up, and then carry out colligation;
33) after the beam colligation finishes veritification, beam is transferred in place;
4) carry out concreting and maintenance.
2. the job practices of inversion type grade beam according to claim 1; It is characterized in that: in said step 12); For making grade beam groove excavation size accurate; Utilize the well-points dewatering pipe to establish an axis cross bar at the absolute altitude place, every little axis in the delineation, whether the inspection of backguy in time excavation position and size be accurate in being convenient to excavate.
3. the job practices of inversion type grade beam according to claim 1 is characterized in that: in said step 12), beam groove excavation is of a size of deck-siding+loose tool wall thickness+whitewash bed thickness, and the detailed process of beam groove excavation is:
A) in time execute, put the dirt line, all follow closely paxilla, draw logical line to cut the earth in the beam both sides;
When b) cutting the earth, the every side of beam is stayed 10mm, end mark to reserve and is shoveled soil before 50mm builds as bed course;
When c) cutting the earth to absolute altitude, check once more axis errorless after, extend out and repair shovel about 8mm;
D) repair shovel finish put in place after, adopt and to spend skin cloth to cover, prevent to rain;
E) timely segmentation check of foundation subsoil;
F) check of foundation subsoil qualified after, in time build the brick loose tool by laying bricks or stones, gapped between the brick and the soil body when building the brick loose tool by laying bricks or stones, with building, guarantee between soil and brick closely knit with the cementation of fissures.
4. the job practices of inversion type grade beam according to claim 1 is characterized in that: in said step 32) in, before beam is gone into groove, at the bottom of beam and the colligation of beam side, the topping cushion block of clamped beam.
5. the job practices of inversion type grade beam according to claim 1 is characterized in that: in said step 33) in, adopt the downslide method in place; Promptly whenever unscrew fastener, let and tighten behind the little cross bar downslide 150mm, unscrew remaining little cross bar fastener then at a distance from a vertical rod; Let the reversed beam muscle in slip under the deadweight effect of reinforcing bar to the little cross bar that glides earlier, with the little cross bar of this decline 150mm that descends again, fastener is tightened then; Unscrew the little cross bar that descends for the first time, let the reversed beam muscle rest on the little cross bar that descends for the second time, the little cross bar that descends for the second time continues decline 150mm; Fastener is tightened, repeated above-mentioned steps, sink to bottom land until beam.
6. the job practices of inversion type grade beam according to claim 5; It is characterized in that: carrying out adopting slide calliper rule spacing when reinforcing bar binding connects; Be provided with breach according to rebar spacing, during colligation at the two ends of reinforcing bar with slide calliper rule breach screens reinforcing bar, treat to take out slide calliper rule after the colligation.
7. the job practices of inversion type grade beam according to claim 1 is characterized in that: in said step 4), may further comprise the steps:
(1) selecting concrete strength grade for use is C30, impervious grade S6; The moistening template of watering before the concreting, cleaning foreign material, ponding after-pouring;
(2) control between each layer concrete and surperficial idle hours;
(3) behind the casting and compacting of concrete, tentatively wipe off by design elevation, roll several times with cylinder before the initial set, with the polishing of wood card, compacting, prevent that shrinkage crack from appearring in the surface again with floating rule;
(4) cleaning constuction joint before concrete wall support, the adjustment spacing is also cleared up the rebar surface foreign material, and water moistening template, constuction joint are used before building with the moistening concrete surface of label cement mortar;
(5) vibratory equipment adopts immersion vibrator, adopts the method for vertically vibrating, and when vibrating wall, inserts 50mm in the lower floor during upper strata; To eliminate the cold seam between two-layer, should avoid colliding reinforcing bar, built-in fitting when vibrating, every some vibrating time is 20-30s; Look concrete surface no longer significantly sinks, no longer bubble occurs, surperficial bleeding is as the criterion; At the service sleeve place, vibrate from a side of sleeve pipe, the concrete bubble is discharged from a side.
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| CN 201210008648 CN102535493B (en) | 2012-01-12 | 2012-01-12 | Method for constructing inverted type foundation beam |
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| CN 201210008648 CN102535493B (en) | 2012-01-12 | 2012-01-12 | Method for constructing inverted type foundation beam |
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| CN103397637B (en) * | 2013-08-27 | 2015-07-08 | 二十二冶集团第一建设有限公司 | Pre-embedding method of grouting sleeve under raft foundation |
| CN105951842B (en) * | 2016-06-03 | 2018-03-30 | 宁夏建工集团有限公司 | Reversed beam styrofoam fetal membrane construction method under raft plate |
| CN112775363B (en) * | 2020-12-24 | 2022-06-21 | 天津市银丰机械系统工程有限公司 | Full-automatic flexible welding net production line |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101761092A (en) * | 2009-12-30 | 2010-06-30 | 中铁十二局集团第二工程有限公司 | Construction method of movable side wall of large overall template of large-span deep foundation pit |
| CN101818501A (en) * | 2009-07-29 | 2010-09-01 | 兰州理工大学 | Construction method of reinforced concrete foundation on top of large-scale trenched pipe culvert |
| CN101962956A (en) * | 2009-07-22 | 2011-02-02 | 中交公路规划设计院有限公司 | Bridge prefabricated foundation and bed-burying method thereof |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002212945A (en) * | 2001-01-17 | 2002-07-31 | Nippon Steel Corp | H steel beam for earth-retaining wall core member and construction method for underground structure using h steel beam |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101962956A (en) * | 2009-07-22 | 2011-02-02 | 中交公路规划设计院有限公司 | Bridge prefabricated foundation and bed-burying method thereof |
| CN101818501A (en) * | 2009-07-29 | 2010-09-01 | 兰州理工大学 | Construction method of reinforced concrete foundation on top of large-scale trenched pipe culvert |
| CN101761092A (en) * | 2009-12-30 | 2010-06-30 | 中铁十二局集团第二工程有限公司 | Construction method of movable side wall of large overall template of large-span deep foundation pit |
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| Title |
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| JP特开2002-212945A 2002.07.31 |
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