CN103867120A - Construction method of drilled grouting piles under special geological condition - Google Patents
Construction method of drilled grouting piles under special geological condition Download PDFInfo
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- 238000005553 drilling Methods 0.000 claims abstract description 40
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- 238000005299 abrasion Methods 0.000 claims abstract description 21
- 238000000034 method Methods 0.000 claims abstract description 14
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- 238000009527 percussion Methods 0.000 claims abstract description 6
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Abstract
The invention discloses a construction method of drilled grouting piles under the special geological condition. Under the conditions that rubbles, stratums, concrete, steel soldier piles and other special substances are contained in the upper geological environment of large-diameter and ultra-long foundation piles, and sandy soil is mainly contained in the lower geological environment, a rotary drilling machine cannot effectively drill, and the effect is extremely low when a percussion drill is singly used, and by the adoption of the method that the percussion drill and the abrasion drill are matched for use, the problem of construction under the special geological conditions can be effectively solved, the effect can be improved by multiple times and even a dozen of times, construction time is effectively shortened, and the construction scheme is simple, convenient and quick to implement, and high in operability, timeliness and convenience.
Description
Technical field
The present invention relates to the construction method of Large Diameter Super-long Bored Piles under a kind of special geologic condition, belong to road and bridge construction technical field.
Background technology
Along with the fast development of China's communication, bridge engineering more and more becomes an important ring of national basis Facilities Construction, and the application of bored pile is also more and more general, and technology also reaches its maturity.But, the particularity of construction of the highway has determined that the geologic structure running into can not be to repeat simply, there is different features in different areas, different locations, actual method of operating also has a lot, abrasion drill, Churn drill, revolves that to dig brill be exactly the instrument that is applicable to respectively targetedly different geologic structures.But some special areas or engineering are used merely a kind of bore process, efficiency is very low, for example, remove in reconstruction project at some old bridges, is badly in need of exploring a kind of effective method, to solve the specific question running in construction.Before and after the eighties, China is across having built a large amount of bridge crossings on the arterial highways such as railway operation line, but, when building, these railway overpass fully do not predict the traffic pressure that great achievement that China's three more than ten years reform and opening-up obtains and rapid economic development bring, to such an extent as to design grade is lower, add that current traffic volume of highway is larger, heavy duty, the remaining incessant after repeated prohibition of overloaded vehicle, larger to railroad bridge structure influence, leave huge potential safety hazard to the bridge crossing of building then.In conjunction with people-oriented, the state basic policy of safety first, highway in China bridge crossing certainly will will enter complete upgrading alteration stage, and it is imperative that dismounting is rebuild.Owing to being old bridge dismounting reconstruction, and these old bridges often cross over the part main line railway of China, Bridge position is relatively fixing, and pile foundation position also relative displacement is limited, the geological condition that therefore may run into Various Complex in the pile foundation construction process of new bridge, brings new problem to pile foundation construction.
First, as shown in Figure 2, newly building bridge or old bridge are removed some pile foundation of reconstruction project and are positioned on existing roadbed, and former roadbed has plenty of and on packing sedimentation by throwing stones or other special geological conditions bases, builds, under roadbed, certain depth place has the slabstone of to treat soft foundation, water level is more shallow, and as shown in Figure 1, Fig. 1 left side is fish pond, the right is rice field, be all weak geology, therefore can not utilize digging mode directly to remove stake position place slabstone, convolution rig cannot creep into; Second, as shown in Figure 3, across the railway line Bridge Pile distance of positions from running railway line side slope toe close to, stake position is on soft foundation, in the time of railway construction or maintenance, be embedded with rail framed bent at stake position place reinforcing road bed, because being arranged in underground, rail framed bent deeply reaches several meters, shallow-layer rail framed bent can excavate to be pulled out, but it is larger that deep layer rail framed bent is pulled out difficulty, not only water level is too shallow but also can affect the subgrade stability of running railway line, does not therefore possess dig on a wide area and pull out the condition of deep layer rail framed bent, does not pull out convolution rig and cannot creep into again; The 3rd, as shown in Figure 5, have rock stratum to invade top, stake position, or new bridge pier position is excessively near with old bridge pier position clear distance, old bridge pier base top reaming concrete is invaded new bridge pier position, and the rig that circles round cannot creep into.
Summary of the invention
For above-mentioned problem, the object of the present invention is to provide the construction method of bored pile under a kind of special geologic condition, can greatly improve the boring operating efficiency under special geologic condition.In prior art, in sand geology, Churn drill drilling depth is quite slow, sometimes within one day, drilling depth only has one or two meter, 50 meters of above long stake use Churn drills often need first quarter moon even more than 20 day, and use convolution rig utilize reverse circulation construction technique creep in sand geology drilling depth per hour can reach five or six meters even more, the long stake of more than 50 meter can complete for about ten hours, work efficiency differs more than tens times, the boring expense of abrasion drill reduces greatly, duration shortens greatly, more bring huge recessive economic benefit, but abrasion drill can not be dealt with problems again completely under some special geologic conditions, the as noted above several situations of example, therefore, in the geology of top, contain in the overlength pile foundation that abrasion drill cannot creep into material, utilize abrasion drill and Churn drill collocation to use, get hold of the opportunity that jump bit smashes the auxiliary stone in hole, be replaced by abrasion drill in good time, it is a kind of effective method to special geology boring.
The present invention is for solving the problems of the technologies described above adopted technical scheme as described below:
A construction method for bored pile under special geologic condition, comprises the following steps:
Step 1: dig out casing foundation ditch with excavator, centering is imbedded steel casing and reinforced;
Step 2: carry out percussion drilling with percussive drill in special formation;
Step 3: when complete special formation creep into and the auxiliary slabstone creeping into or cobble propose drill bit after being thoroughly crashed to pieces, change convolution rig, utilize reverse circulation construction technique to continue drilling depth until pore-forming.
Further, when in step 1, centering is imbedded steel casing, in clay back-filling in layers compacting for steel casing surrounding; Under weak geological condition, can adopt cement-soil or plain concrete to reinforce.
Further, the processing method while running into rail framed bent in step 1 and step 2 is as follows:
A. pull out upper strata rail framed bent, after centering, imbed steel casing, steel casing surrounding is carried out to backfill reinforcing with plain concrete, steel casing is connected to processing with concrete;
B. reinforce the alloy high carbon steel rod at four angles at 45 ° in drill hammer positive cone surrounding, reach after C20 at concrete strength, carry out jackstone with Churn drill and impact construction, when impacting to steel casing, jackstone upwards arches upward after 2 ㎝, the mud jackstone of confirmation pile foundation periphery tamps have been reinforced, take out drill hammer, the alloy high carbon steel rod of 45° angle is prescinded with gas cutting, recover drill hammer normal condition;
C. when Churn drill drilling depth is during to contact second layer rail framed bent, the hard cobble that is 20 ㎝ by diameter drops in hole, utilize Churn drill to impact the transverse component that produces of cobble to surrounding impact extrusion rail framed bent, until Churn drill by rail framed bent impact extruded to pile foundation surrounding hole wall.
Further, processing method while running into reaming concrete or top, intrusion stake position, massif rock stratum in step 1 and step 2 is as follows: the hard masonry that is greater than 75MPa by 20m3 intensity is that pin cutter impacts cutting to concrete or the rock stratum invaded in stake footpath, in the time that Churn drill drilling depth is invaded aspect or massif rock intrusion aspect to reaming concrete, insert the hard stone that 40 ㎝ are thick, Churn drill impacts drilling depth.
Further, set up vertical degree observation platform in step 2 in steel casing outside, find after Churn drill off normal the thick hard stone of backfill 40 ㎝ again, each cyclic advance is less than or equal to 10 ㎝, until jump bit is broken through hole enlargement place.
Further, in step 3, propose chopping bit and change while circling round rig, carry out pile foundation with inspecting hole device and vertically spend detection.
Further, utilize convolution rig drilling depth to run into while hardening layer of sand in step 3, the abrasion drill penetration rate that slows down, utilizes NaOH to drop into mud pit as additive, makes the pH value of mud reach 9 ~ 10.
Further again, while utilizing convolution rig drilling depth in step 3, in mud pit, add swell soil, cellulose, the proportion of mud is remained between 1.18 ~ 1.2, more than viscosity reaches 24S.
Beneficial effect of the present invention is as follows: the present invention is directed to the Bridge Pile Foundation Construction method under special geologic condition, utilize being used in conjunction with of drill machine and convolution rig, obviously improve efficiency of construction, greatly shorten the duration, especially for the bridge construction of crossing over running railway line, directly and indirectly economic benefit highly significant is ageing strong, simple to operate.
Accompanying drawing explanation
Fig. 1 is flow chart of the present invention;
Fig. 2 is pile foundation log sheet on the weak roadbed processed of original packing sedimentation by throwing stones;
Fig. 3 is rail framed bent arrangement diagram in pile foundation;
Fig. 4 is track schematic diagram;
Fig. 5 is that reaming concrete is invaded pile foundation sectional drawing.
Each figure description of reference numerals: 1 is fish pond, 2 is rice field, and 3 is sand, and 4 is slabstone, and 5 is railway bed, and 6 is track, and 7 is the layer of sand that hardens, and 8 is concrete, 9 is new stake position, the 10 old pile foundations for reaming.
The specific embodiment
Below in conjunction with the drawings and specific embodiments, present invention is described.
A construction method for bored pile under special geologic condition, as shown in Figure 1, comprises the following steps:
Step 1: dig out casing foundation ditch with excavator, centering is imbedded steel casing and reinforced;
Step 2: carry out percussion drilling with percussive drill in special formation;
Step 3: when complete special formation creep into and the auxiliary slabstone creeping into or cobble propose drill bit after being thoroughly crashed to pieces, change convolution rig, utilize reverse circulation construction technique to continue drilling depth until pore-forming.
When in step 1, centering is imbedded steel casing, necessary assurance position, hole is accurate, casing is installed firmly, uses clay back-filling in layers also to tamp in steel casing surrounding; Under weak geological condition, reinforce with cement-soil or plain concrete.
In accompanying drawing of the present invention, Fig. 2 is pile foundation log sheet on the weak roadbed processed of original packing sedimentation by throwing stones, and Fig. 4 is track schematic diagram.
As shown in Figure 3, the processing method while running into rail framed bent in step 1 and step 2 is as follows:
A. pull out upper strata rail framed bent, after centering, imbed steel casing, steel casing surrounding is carried out to backfill reinforcing with plain concrete, steel casing is connected to processing with concrete;
B. reinforce the alloy high carbon steel rod at four angles at 45 ° in drill hammer positive cone surrounding, for to surrounding extruding slabstone, under positive cone, continue to use and when alloy high carbon steel rod reinforces to guarantee to touch rail campshed, do not damage drill bit.Reach after C20 at concrete strength, carry out jackstone with Churn drill and impact construction, when impacting to steel casing, jackstone upwards arches upward after 2 ㎝, the mud jackstone of confirmation pile foundation periphery tamps have been reinforced, take out drill hammer, the alloy high carbon steel rod of 45° angle is prescinded with gas cutting, recover drill hammer normal condition;
C. when Churn drill drilling depth is during to contact second layer rail framed bent, the hard cobble that is 20 ㎝ by diameter drops in hole, utilize Churn drill to impact the transverse component that produces of cobble to surrounding impact extrusion rail framed bent, until Churn drill by rail framed bent impact extruded to pile foundation surrounding hole wall.
As shown in Figure 5, processing method in step 1 and step 2 in the time that Churn drill drilling depth runs into reaming concrete or top, intrusion stake position, massif rock stratum is as follows: the hard masonry that is greater than 75MPa by 20m3 intensity is that pin cutter impacts cutting to concrete or the rock stratum invaded in stake footpath, in the time that Churn drill drilling depth is invaded aspect or massif rock intrusion aspect to reaming concrete, insert the hard stone that 40 ㎝ are thick, Churn drill impacts drilling depth.
In step 2, set up vertical degree observation platform in steel casing outside, find after Churn drill off normal the thick hard stone of backfill 40 ㎝ again, each cyclic advance is less than or equal to 10 ㎝, until jump bit is broken through hole enlargement place.
In step 3, propose chopping bit and change while circling round rig, carry out pile foundation with inspecting hole device and vertically spend detection.
In step 3, utilize convolution rig drilling depth to run into while hardening layer of sand, the abrasion drill penetration rate that slows down, utilizes NaOH to drop into mud pit as additive, makes the pH value of mud reach 9 ~ 10.
While utilizing convolution rig drilling depth in step 3, in mud pit, add swell soil, cellulose, the proportion of mud is remained between 1.18 ~ 1.2, more than viscosity reaches 24S.
The special geologic condition of indication of the present invention refers to that in the geology of top, bridge super long pile foundation stake position, containing slabstone, cobble, reaming invades concrete, massif and invade the geology that rock stratum or other convolution rigs cannot creep into.
In one embodiment, construction method of the present invention is:
(1) dig out dark 4 meters with excavator, the casing foundation ditch that diameter is 3.5 meters, centering is imbedded the steel casing of long 3.0 meters;
(2) carry out percussion drilling with percussive drill;
(3) after slabstone is thoroughly smashed in sandy soils, propose drill bit, change convolution rig, utilize abrasion drill reverse circulation construction technique to carry out drilling depth until pore-forming.
In another embodiment, construction method of the present invention is as follows:
(1) dig out dark 4.5 meters with excavator, the casing foundation ditch that diameter is 3.5 meters, pulls out upper strata rail campshed, imbeds the steel casing of long 3.0 meters after centering, steel casing surrounding is carried out to backfill reinforcing with plain concrete, steel casing is connected to processing with concrete;
(2) reach after C20 at concrete strength, carry out jackstone with Churn drill and impact construction;
(3) for guaranteeing that slabstone is by compacted the tamping of mud jackstone of pile foundation periphery, can undergo technological transformation by impact drill bit, reinforce the alloy high carbon steel rod at four angles at 45 ° in drill hammer positive cone surrounding, for pushing slabstone to surrounding, under positive cone, eaves is reinforced by alloy high carbon steel rod, does not damage drill bit when guaranteeing to touch rail campshed;
(4) upwards arch upward after 2 ㎝ when jackstone impacts to steel casing, confirm that packing sedimentation by throwing stones layer has obtained reinforcing;
(5) take out drill hammer, the alloy high carbon steel rod of 45° angle is prescinded with gas cutting, recover drill hammer normal condition;
(6) in the time that Churn drill drilling depth to 6 meter touches second layer rail framed bent, the hard cobble that is 20 ㎝ by the diameter of having purchased drops in hole, utilizes Churn drill to impact transverse component that cobble produces to surrounding impact extrusion rail framed bent;
(7) the vertical degree observation platform that utilizes steel casing outside to set up, stake footpath off normal situation in impact process is observed at any time, find after Churn drill off normal the thick cobble of backfill 40 ㎝ again, each cyclic advance is no more than 10 ㎝, guarantee the vertical degree of pile foundation, go round and begin again, until Churn drill by rail framed bent impact extruded to pile foundation surrounding hole wall;
(8) in the time that Churn drill construction no longer includes steel sound, drill bit has passed through rail framed bent stratum substantially, and Churn drill continues drilling depth, when the cobble of backfill is thoroughly crashed to pieces in layer of sand, while not existing the stone of large to affect abrasion drill construction, be replaced by convolution rig drilling depth until pore-forming.
In another embodiment, construction method of the present invention is:
(1) the steel casing of imbedding is reinforced;
(2) preparing the hard masonry that 20m3 intensity exceedes 75MPa is that pin cutter impacts cutting to the concrete of invading in stake footpath;
(3) when Churn drill drilling depth is during to 6m, insert hard stone 40 ㎝, Churn drill impacts drilling depth;
(4) set up vertical degree observation platform in steel casing outside, stake footpath off normal situation in impact process is observed at any time, find after Churn drill off normal the thick hard stone of backfill 40 ㎝ again, each cyclic advance is no more than 10 ㎝, guarantee the vertical degree of pile foundation, go round and begin again, until jump bit is broken through hole enlargement place;
(5) when Churn drill is smoothly when drilling depth, the standard of breaking up completely as hole enlargement concrete;
(6) propose Churn drill and carry out pile foundation with inspecting hole device and vertically spend detection, whether an observation footpath frees variation;
(7) jump bit continues drilling depth, after slabstone is thoroughly smashed in sandy soils, uses abrasion drill instead and continues to creep into;
(8) run into while hardening layer of sand at 35 ~ 43 meters, abrasion drill penetration rate slows down, utilize NaOH to drop into mud pit as additive, change mud PH value, make mud PH value reach 9 ~ 10 scope, can guarantee the thickness of hydration shell, improve slurry rate and the stability of mud, reduce fluid loss, can be used for again the softening layer of sand that hardens;
(9) adjust slip consistency, on original mud basis, improve the character of mud, in mud pit, strengthen swell soil, cellulose input, mud balance is remained between 1.18 ~ 1.2, more than viscosity reaches 24S, improve colloidity and the stability of mud, make sandy soils surface form film and protect hole wall and peel off, reduce fluid loss, improve drilling efficiency;
(10) after abrasion drill enters normal drilling depth state, confirm by the sandy soils that hardens, recover normally to creep into pore-forming.
Meaning of the present invention and benefit:
Meaning of the present invention is: for the construction of the bridge pile foundation under special geologic condition, utilize being used in conjunction with of drill machine and convolution rig, greatly improved the boring operating efficiency under Special Geological Condition.In sand geology, Churn drill drilling depth was quite slow in the past, and within one day sometimes, drilling depth only has one or two meter, and 50 meters of above long stake use Churn drills often need first quarter moon even more than 20 day.And use abrasion drill reverse circulation drilling in sand geology per hour reach five or six meters even more, the long stake of more than 50 meter can complete for about ten hours, work efficiency differs more than tens times, the boring expense of abrasion drill reduces greatly, duration shortens greatly, more bring huge recessive economic benefit, but abrasion drill can not be dealt with problems again completely under some special geologic conditions, the as noted above several situations of example, therefore, in the geology of top, contain in the overlength pile foundation of the material that abrasion drill cannot creep into, utilize abrasion drill and Churn drill collocation to use, get hold of the opportunity that jump bit smashes the auxiliary stone in hole, be replaced by abrasion drill in good time, it is the effective method of one to special geology boring.
It should be noted that; above-mentioned specific embodiment is only exemplary; under above-mentioned instruction of the present invention, those skilled in the art can carry out various improvement and distortion on the basis of above-described embodiment, and these improvement or distortion all drop in protection scope of the present invention.It will be understood by those skilled in the art that specific descriptions are above in order to explain object of the present invention, not for limiting the present invention.Protection scope of the present invention is limited by claim and equivalent thereof.
Claims (8)
1. a construction method for bored pile under special geologic condition, is characterized in that, comprises the following steps:
Step 1: dig out casing foundation ditch with excavator, centering is imbedded steel casing and reinforced;
Step 2: carry out percussion drilling with percussive drill in special formation;
Step 3: when complete special formation creep into and the auxiliary slabstone creeping into or cobble propose drill bit after being thoroughly crashed to pieces, change convolution rig, utilize reverse circulation construction technique to continue drilling depth until pore-forming.
2. the construction method of bored pile under special geologic condition as claimed in claim 1, is characterized in that, when in step 1, centering is imbedded steel casing, in clay back-filling in layers compacting for steel casing surrounding; Under weak geological condition, adopt cement-soil or plain concrete to reinforce.
3. the construction method of bored pile under special geologic condition as claimed in claim 1, is characterized in that, the processing method while running into rail framed bent in step 1 and step 2 is as follows:
A. pull out upper strata rail framed bent, after centering, imbed steel casing, steel casing surrounding is carried out to backfill reinforcing with plain concrete, steel casing is connected to processing with concrete;
B. reinforce the alloy high carbon steel rod at four angles at 45 ° in drill hammer positive cone surrounding, reach after C20 at concrete strength, carry out jackstone with Churn drill and impact construction, when impacting to steel casing, jackstone upwards arches upward after 2 ㎝, the mud jackstone of confirmation pile foundation periphery tamps have been reinforced, take out drill hammer, the alloy high carbon steel rod of 45° angle is prescinded with gas cutting, recover drill hammer normal condition;
C. when Churn drill drilling depth is during to contact second layer rail framed bent, the hard cobble that is 20 ㎝ by diameter drops in hole, utilize Churn drill to impact the transverse component that produces of cobble to surrounding impact extrusion rail framed bent, until Churn drill by rail framed bent impact extruded to pile foundation surrounding hole wall.
4. the construction method of bored pile under special geologic condition as claimed in claim 1, it is characterized in that, processing method while running into reaming concrete or top, intrusion stake position, massif rock stratum in step 1 and step 2 is as follows: the hard masonry that is greater than 75MPa by 20m3 intensity is that pin cutter impacts cutting to concrete or the rock stratum invaded in stake footpath, in the time that Churn drill drilling depth is invaded aspect or massif rock intrusion aspect to reaming concrete, insert the hard stone that 40 ㎝ are thick, Churn drill impacts drilling depth.
5. the construction method of bored pile under special geologic condition as claimed in claim 4, it is characterized in that, in step 2, set up vertical degree observation platform in steel casing outside, find after Churn drill off normal the thick hard stone of backfill 40 ㎝ again, each cyclic advance is less than or equal to 10 ㎝, until jump bit is broken through hole enlargement place.
6. the construction method of bored pile under the special geologic condition as described in one of claim 1-5, is characterized in that, proposes chopping bit and change while circling round rig in step 3, carries out pile foundation vertically spend detection with inspecting hole device.
7. the construction method of bored pile under special geologic condition as claimed in claim 6, it is characterized in that, in step 3, utilize convolution rig drilling depth to run into while hardening layer of sand, abrasion drill penetration rate slows down, utilize NaOH to drop into mud pit as additive, make the pH value of mud reach 9 ~ 10.
8. the construction method of bored pile under special geologic condition as claimed in claim 7, it is characterized in that, while utilizing convolution rig drilling depth in step 3, in mud pit, add swell soil, cellulose, the proportion of mud is remained between 1.18 ~ 1.2, more than viscosity reaches 24S.
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| CN201410110469.0A CN103867120B8 (en) | 2014-03-24 | The construction method of cast-in-situ bored pile under special geologic condition |
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| CN201410110469.0A CN103867120B8 (en) | 2014-03-24 | The construction method of cast-in-situ bored pile under special geologic condition |
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| CN103867120A true CN103867120A (en) | 2014-06-18 |
| CN103867120B CN103867120B (en) | 2016-02-03 |
| CN103867120B8 CN103867120B8 (en) | 2016-05-04 |
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| CN107059847A (en) * | 2017-06-20 | 2017-08-18 | 中国华西企业有限公司 | A kind of competent bed water mill bores pouring pile hole structure and its construction from the bottom of one's heart |
| CN109488202A (en) * | 2018-11-05 | 2019-03-19 | 云南建投第三建设有限公司 | A kind of gravel rock stratum pile foundation drilling construction engineering method containing gravel-boulder bed |
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| CN104832085A (en) * | 2015-03-16 | 2015-08-12 | 中国水电基础局有限公司 | Deep cover layer pipe drilling method |
| CN105952374A (en) * | 2016-05-06 | 2016-09-21 | 中国水利水电第十工程局有限公司 | Complex soil layer anchor cable hole drill pore-forming method |
| CN105952374B (en) * | 2016-05-06 | 2019-02-05 | 中国水利水电第十一工程局有限公司 | A kind of complex random systems prestressed anchor cable borehole forming hole method |
| CN107059847A (en) * | 2017-06-20 | 2017-08-18 | 中国华西企业有限公司 | A kind of competent bed water mill bores pouring pile hole structure and its construction from the bottom of one's heart |
| CN109488202A (en) * | 2018-11-05 | 2019-03-19 | 云南建投第三建设有限公司 | A kind of gravel rock stratum pile foundation drilling construction engineering method containing gravel-boulder bed |
| CN110410001A (en) * | 2019-06-26 | 2019-11-05 | 广州穗岩土木科技股份有限公司 | A kind of construction method of superhard rock stratum pile foundation pore-forming |
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