CN102995632A - Cast-in-situ bored pile technique - Google Patents

Abstract

The invention relates to the technical field of foundation treatment and in particular relates to a cast-in-situ bored pile technique. The cast-in-situ bored pile technique comprises the following steps of: firstly, releasing a point at a pile position; secondly, placing a drilling machine in position; thirdly, repairing the point at the pile position; fourthly, mounting a pile casing and making holes; fifthly, cleaning the holes for the first time; sixthly, placing a reinforcement cage and a concrete guide pipe; seventhly, cleaning the holes for the second time; eighthly, casting and compacting concrete; ninthly, removing the guide pipe; tenthly, teeming concrete; and eleventhly, protecting a pile top. The cast-in-situ bored pile technique provided by the invention can carry out the foundation treatment in a limited space below a loading shed, pile body concrete quality and bearing capacity requirements of a bored pile can be met, and stability and safety of the ground below the loading shed are guaranteed. The cast-in-situ bored pile technique provided by the invention overcomes the defect that the existing foundation treatment method is difficult to realize a foundation treatment target in the limited space below the loading shed.

Description

Drilling hole bored concrete pile technology

Technical field:

The present invention relates to a kind of foundation treatment technology field, particularly a kind of drilling hole bored concrete pile technology.

Background technology:

Because the many oil depot geological conditionss of middle mountain people are weak, the large tracts of land sedimentation appears in the driving place of not carrying out the ground processing under the entrucking canopy, need to carry out ground to it and process.Owing to be subjected to the restriction of clear height (5.8 meters) in the canopy, and each installation of oiling island equipment, large-scale pile machine equipment can not enter, since the ground mud average 23 meters dark, adopting the normal boring of geological drilling rig is to reach construction requirement, the mud internal drilling can cause that shrinkage cavity appears in hole, the hole etc. of collapsing, thereby existing method for processing foundation all is difficult to realize in the confined space ground processing target under the entrucking canopy.

Summary of the invention:

The technical problem to be solved in the present invention provides a kind of drilling hole bored concrete pile technology, and this technology has realized ground processing in the confined space under the entrucking canopy, satisfies drilled pile pile body concrete quality and requirement for bearing capacity, guarantees stability and the safety on ground under the entrucking canopy.Overcome existing method for processing foundation all is difficult to realize in the confined space ground processing target under the entrucking canopy deficiency.

The technical solution used in the present invention is: a kind of drilling hole bored concrete pile technology, and this technical step is as follows:

One, put some the stake position: can directly emit all piles heart coordinate with total powerstation according to stake position coordinate, stamp timber, can go on foot construction once after checking;

Two, auger is in place: rig adopts geological drilling rig, when rig is in place, must held stationary, and not run-off the straight, displacement, rig should first test-run a machine in place before, and is in place again after the assurance machine can work;

Three, stake position complex point: before beginning boring after rig is in place, should check again a site, guarantee the stake position accurately;

Four, casing setting and pore-forming: pore forming process adopts full cylinder-wall protecting, and the casing specification is ф 426 * 7, long 4 meters of every joint, employing is tied up the weldering mode and is overlapped, for guaranteeing the smooth closely knit of equipment construction platform, should first smooth building-site before the construction, and according to the suitable drill bit of field requirement employing; Full casing drilling construction sequentially is: creep into to desired depth (1), (2) creep in the casing to desired depth, (3) arrange casing, and casing is compressed into to casing about 30cm above ground level position, repeat (1), (2), (3) step until the design hole depth, pore-forming is finished;

Five, for the first time clear hole: after being bored into projected depth, reply hole depth, position, hole, hole shape, aperture etc. check, utilize slush pump and conduit that natural mud is injected in the aperture, repeatedly flushing, at last to cleaning sediment at the bottom of the hole, and utilize air compressor machine to enter air toward the hole rising pouring, utilize it in the hole and mud mixes the hydraulic pressure that produces, sand setting and sediment are developed simultaneously, and sediment thickness must not surpass 50mm at the bottom of the hole, whole hole;

Six, reinforcing cage and tremie are placed: after the reinforcing cage sectional making is finished, because this engineering the drilling stake aperture is little, stake footpath 400mm, long 46～the 48m of stake, reinforcing cage carries out the merogenesis lifting, and the aperture spreading requires 5% of its verticality allowable variation stake footpath when reinforcing cage is laid, reinforcing cage all at the bottom of the hole after, descend again the concrete steel conduit; DN125 concrete steel conduit adopts screwed connection, can carry pipe in order to guarantee conduit after casting and compacting of concrete is finished, and in the end a joint catheter tail is connected on the suspension ring wire rope in the lower hand-hole with U-shaped suspension ring of reinforcing bar welding;

Seven, clear hole for the second time: after reinforcing cage and conduit are lowered to, namely carry out clear hole second time, require clear Kong Zhikong at the bottom of sediment be not more than 50mm, clear hole to mud balance only reaches designing requirement;

Eight, casting and compacting of concrete: before concreting, steel conduit is connected on the ground pump, utilize pressure that the ground pump provides with concrete endlessly at the bottom of the displacement pile, in perfusion concrete process, the perfusion Underwater Concrete will carry out continuously, must not interrupt, and guarantees the concrete piles quality, until slurry is returned in the aperture, to guarantee the concrete piles quality;

Nine, unload conduit: the aperture stops concreting after returning out concrete, and with the tremie proposition of vibrating, the segmentation dismounting conduit while carrying until only surplus final section conduit ends, is finished rear tube such as casting and compacting of concrete and can't be extracted, and then conduit is stayed in the stake;

Ten, teeming concrete: conduit should in time carry out teeming to the hole inner concrete when only being discharged to surplus final section, and the concrete supplementary irrigation annotates that should to exceed design stake top mark high 0.80 meter, to guarantee pile crown concrete quality, dismounting final section conduit after teeming is finished;

11, stake top protection: after concreting is finished, note the protection of stake top.

The invention has the beneficial effects as follows: bored pile equipment of the present invention is little, thereby it is relatively simple to have technique, and construction is not subjected to the advantage of place restriction, and rig is to existing equipment and Building Influence are little on every side during construction; Because adopted the steel casing of ф 426 * 7, thereby can guarantee stake footpath size, hole quality is guaranteed in do not collapse hole, not shrinkage cavity; Since adopt slush pump and portable air compressor to be used, can be effectively clean the cleaning of inner hole deposition slag, reach the condition of building; Owing to adopt the concreting conduit of DN125, thereby at the bottom of can be endlessly the C30 underwater concrete being sent into the hole, make concrete piles quality molding effect good; The present invention has reached the ground processing target, has shortened the construction period, has increased economic benefit.

The specific embodiment:

Because bored pile operation under the entrucking canopy, the entrucking canopy is 5.8 meters apart from ground level, can not guarantee the required whole height requirement of construction machinery lifting casing (every joint 3-4 rice), so ground integral body under the entrucking canopy is down dug dark 1.4 meters, guarantee that geological drilling rig is in place to the stake position.

The step of drilling hole bored concrete pile technology is as follows:

One, put some the stake position: can directly emit all piles heart coordinate with total powerstation according to stake position coordinate, stamp timber, can go on foot construction once after checking;

Two, auger is in place: rig adopts geological drilling rig, when rig is in place, must held stationary, and not run-off the straight, displacement, rig should first test-run a machine in place before, and is in place again after the assurance machine can work;

Three, stake position complex point: before beginning boring after rig is in place, should check again a site, guarantee the stake position accurately;

Four, casing setting and pore-forming: pore forming process adopts full cylinder-wall protecting, and the casing specification is ф 426 * 7, long 4 meters of every joint, employing is tied up the weldering mode and is overlapped, for guaranteeing the smooth closely knit of equipment construction platform, should first smooth building-site before the construction, and according to the suitable drill bit of field requirement employing; Full casing drilling construction sequentially is: creep into to desired depth (1), (2) creep in the casing to desired depth, (3) arrange casing, and casing is compressed into to casing about 30cm above ground level position, repeat (1), (2), (3) step until the design hole depth, pore-forming is finished;

Five, for the first time clear hole: after being bored into projected depth, reply hole depth, position, hole, hole shape, aperture etc. check, utilize slush pump and conduit that natural mud is injected in the aperture, repeatedly flushing, at last to cleaning sediment at the bottom of the hole, and utilize air compressor machine to enter air toward the hole rising pouring, utilize it in the hole and mud mixes the hydraulic pressure that produces, sand setting and sediment are developed simultaneously, and sediment thickness must not surpass 50mm at the bottom of the hole, whole hole;

Six, reinforcing cage and tremie are placed: after the reinforcing cage sectional making is finished, because this engineering the drilling stake aperture is little, stake footpath 400mm, long 46～the 48m of stake, reinforcing cage carries out the merogenesis lifting, and the aperture spreading requires 5% of its verticality allowable variation stake footpath when reinforcing cage is laid, reinforcing cage all at the bottom of the hole after, descend again the concrete steel conduit; DN125 concrete steel conduit adopts screwed connection, can carry pipe in order to guarantee conduit after casting and compacting of concrete is finished, and in the end a joint catheter tail is connected on the suspension ring wire rope in the lower hand-hole with U-shaped suspension ring of reinforcing bar welding;

Seven, clear hole for the second time: after reinforcing cage and conduit are lowered to, namely carry out clear hole second time, require clear Kong Zhikong at the bottom of sediment be not more than 50mm, clear hole to mud balance only reaches designing requirement;

Eight, casting and compacting of concrete: because this engineering pile is longer, routinely the method for smashing of watering is difficult to assurance concrete piles compactness during concreting, the quality problems such as broken pile, undergauge, folder mud and honeycomb structure also may occur.Before concreting, steel conduit is connected on the ground pump, utilize pressure that the ground pump provides with concrete endlessly at the bottom of the displacement pile, in perfusion concrete process, the perfusion Underwater Concrete will carry out continuously, must not interrupt, guarantee the concrete piles quality, until slurry is returned in the aperture, to guarantee the concrete piles quality;

Nine, unload conduit: the aperture stops concreting after returning out concrete, and with the tremie proposition of vibrating, the segmentation dismounting conduit while carrying until only surplus final section conduit ends, is finished rear tube such as casting and compacting of concrete and can't be extracted, and then conduit is stayed in the stake;

Ten, teeming concrete: conduit should in time carry out teeming to the hole inner concrete when only being discharged to surplus final section, and the concrete supplementary irrigation annotates that should to exceed design stake top mark high 0.80 meter, to guarantee pile crown concrete quality, dismounting final section conduit after teeming is finished;

11, stake top protection: after concreting is finished, note the protection of stake top.

Be understandable that, more than about specific descriptions of the present invention, only for the present invention being described and being not to be subject to the described technical scheme of the embodiment of the invention, those of ordinary skill in the art is to be understood that, still can make amendment or be equal to replacement the present invention, to reach identical technique effect; Use needs as long as satisfy, all within protection scope of the present invention.

Claims (1)

1. drilling hole bored concrete pile technology, it is characterized in that: this technical step is as follows:

One, put some the stake position: can directly emit all piles heart coordinate with total powerstation according to stake position coordinate, stamp timber, can go on foot construction once after checking;

Two, auger is in place: rig adopts geological drilling rig, when rig is in place, must held stationary, and not run-off the straight, displacement, rig should first test-run a machine in place before, and is in place again after the assurance machine can work;

Three, stake position complex point: before beginning boring after rig is in place, should check again a site, guarantee the stake position accurately;

Four, casing setting and pore-forming: pore forming process adopts full cylinder-wall protecting, and the casing specification is ф 426 * 7, long 4 meters of every joint, employing is tied up the weldering mode and is overlapped, for guaranteeing the smooth closely knit of equipment construction platform, should first smooth building-site before the construction, and according to the suitable drill bit of field requirement employing; Full casing drilling construction sequentially is: creep into to desired depth (1), (2) creep in the casing to desired depth, (3) arrange casing, and casing is compressed into to casing about 30cm above ground level position, repeat (1), (2), (3) step until the design hole depth, pore-forming is finished;

Five, for the first time clear hole: after being bored into projected depth, reply hole depth, position, hole, hole shape, aperture etc. check, utilize slush pump and conduit that natural mud is injected in the aperture, repeatedly flushing, at last to cleaning sediment at the bottom of the hole, and utilize air compressor machine to enter air toward the hole rising pouring, utilize it in the hole and mud mixes the hydraulic pressure that produces, sand setting and sediment are developed simultaneously, and sediment thickness must not surpass 50mm at the bottom of the hole, whole hole;

Six, reinforcing cage and tremie are placed: after the reinforcing cage sectional making is finished, because this engineering the drilling stake aperture is little, stake footpath 400mm, long 46～the 48m of stake, reinforcing cage carries out the merogenesis lifting, and the aperture spreading requires 5% of its verticality allowable variation stake footpath when reinforcing cage is laid, reinforcing cage all at the bottom of the hole after, descend again the concrete steel conduit; DN125 concrete steel conduit adopts screwed connection, can carry pipe in order to guarantee conduit after casting and compacting of concrete is finished, and in the end a joint catheter tail is connected on the suspension ring wire rope in the lower hand-hole with U-shaped suspension ring of reinforcing bar welding;

Seven, clear hole for the second time: after reinforcing cage and conduit are lowered to, namely carry out clear hole second time, require clear Kong Zhikong at the bottom of sediment be not more than 50mm, clear hole to mud balance only reaches designing requirement;

Eight, casting and compacting of concrete: before concreting, steel conduit is connected on the ground pump, utilize pressure that the ground pump provides with concrete endlessly at the bottom of the displacement pile, in perfusion concrete process, the perfusion Underwater Concrete will carry out continuously, must not interrupt, and guarantees the concrete piles quality, until slurry is returned in the aperture, to guarantee the concrete piles quality;

Nine, unload conduit: the aperture stops concreting after returning out concrete, and with the tremie proposition of vibrating, the segmentation dismounting conduit while carrying until only surplus final section conduit ends, is finished rear tube such as casting and compacting of concrete and can't be extracted, and then conduit is stayed in the stake;

Ten, teeming concrete: conduit should in time carry out teeming to the hole inner concrete when only being discharged to surplus final section, and the concrete supplementary irrigation annotates that should to exceed design stake top mark high 0.80 meter, to guarantee pile crown concrete quality, dismounting final section conduit after teeming is finished;

11, stake top protection: after concreting is finished, note the protection of stake top.