CN1676763A - Boring-tamping cement-soil compacting pile construction method - Google Patents
Boring-tamping cement-soil compacting pile construction method Download PDFInfo
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- CN1676763A CN1676763A CN 200510017522 CN200510017522A CN1676763A CN 1676763 A CN1676763 A CN 1676763A CN 200510017522 CN200510017522 CN 200510017522 CN 200510017522 A CN200510017522 A CN 200510017522A CN 1676763 A CN1676763 A CN 1676763A
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Abstract
One construction method of the drilling ram enlarge the gray soil and squeeze the close-grained stake has the character of having small noisy, light vibration, can avoid the damp sinking efficiently, increase the carrying capacity of the multiplex base. The concrete scheme of the technique is that there are many steps of the drilling, (1) dig to a 5-11 meters-diameter hole by a drill; (2) check the depth and the vertical angle of the hole; (3) after the depth and the vertical angle of the hole fit for the need, we ram empty to bottom of the hole by stake-making and backfill machine, and then we fill the material into it, storied backfill and solid ram by stake-making and backfill machine, repeatedly do this up to the backfill reach the designed level.
Description
Technical field:
The invention belongs to cement-soil compaction pile construction method field in the ground treatment construction skill, especially a kind of boring-tamping cement-soil compacting pile construction method.
Background technology
At present, handle the field of executing at ground, traditional immersed tube or impact holing mode, because noise is big, vibrations are big, in municipal construction, eliminated, and rammed concrete pile is a kind of ground New Method for Processing of rising in recent years, entered building lot treatment technology standard JG79-2002, and the method for the construction of fetching earth in the standard can not be eliminated the settlement by soaking of inter-pile soil, and construction technology also has following drawback: (1) stake footpath: adopt the soil compaction pore-forming, soil property is very hard in saturated yielding type loess area, meets the geology hard formation, be difficult to pore-forming, and the stake footpath is restricted also; (2) stake is long: adopt soil compaction pore-forming or soil taking hole forming, limited by capacity of equipment soil layer situation, hole depth is restricted, and general stake is long can only be in 10 meters; (3) inter-pile soil: if adopt soil taking hole forming, the method construction does not have compacted effect to inter-pile soil, can not eliminate the settlement by soaking of loess; (4) bearing capacity of foundation soil: no matter be soil compaction pore-forming or soil taking hole forming, all below 1000 kilograms, the pile body coefficient of consolidation is low with hammer in its backfill, and strength of the mixing pile is low, and Bearing Capacity of Composite Foundation is also low.
Because the existence of above-mentioned defective, limited this method for processing foundation using and develop greatly in Collapsible Loess District.
Summary of the invention
The purpose of this invention is to provide that a kind of construction noise is little, vibrations are little, can effectively eliminate inter-pile soil settlement by soaking, improve the boring-tamping cement-soil compacting pile construction method of Bearing Capacity of Composite Foundation.
Technical scheme of the present invention is: boring-tamping cement-soil compacting pile construction method is characterized in that comprising the following steps: that fetch earth with pore-forming equipment (1) forms the hole of 5-11 rice diameter; (2) check depth of pore forming and hole perpendicularity; (3) after depth of pore forming and hole perpendicularity meet the requirements, earlier with piling-backfilling equipment to the hole at the bottom of empty the rammer, begin filler then, with piling-backfilling equipment compaction in layers backfill, until the absolute altitude that repeats to be backfilling into design.
Described pore-forming equipment is selected according to the design length of stake, and stake long design load below 7 meters adopts motor-driven shovel pore-forming, and the long design load of stake adopts the long-spiral drilling machine pore-forming in more than 7 meters 30 meters the time.
Described piling-backfilling equipment is made up of frame, lifting hoist engine and backfill stake pane hammer, and hoist engine drives the motion of backfill stake pane hammer by frame.
When will satisfying backfill, the bracket height of described piling-backfilling equipment puies forward the demand of hammer height, carry the hammer height greater than 4 meters, promoting hoist engine is rolling formula 3-5 ton hoist engine, backfill stake pane hammer shaped upper part is a cylinder, lower shape is a toe, material is a 45# cast steel solid construction, and weight is more than 1000 kilograms.
Stake hole centre deviation is less than 1/4 of stake footpath design load, and less than 1/6 of stake footpath design load, the vertical degree of the peg hole deviation is less than 1.5% to strip foundation, and the empty back stake hole depth that rams is greater than stake hole projected depth, and pile body diameter is greater than design stake footpath behind the pile.
Must more than stake top mark height, stay the reservation soil layer of 0.6-1.2 rice during construction.
The pile body coefficient of consolidation is greater than 0.97.
Backfilling material is that the compound that cohesive soil and Portland cement are evenly mixed system is a cement-soil, and earth material adopts cohesive soil and silt, and organic content is less than 5% in the earth material, and the water content of compound and optimum water content allowable variation are ± 2%.
The raising degree is rammed on the stake top should be high more than 0.5 meter greater than design stake top mark.
Effect of the present invention is: construction noise is little, vibrations are little, can construct in the city.Expanded diameter is greater than drilling diameter, drilling diameter is certain, but expanded diameter can be carried hammer height, lift height, hammer number by adjustment, freely adjust expanded diameter, becoming the shape diameter is 400-800mm, because expanded diameter greater than drilling diameter, so inter-pile soil is had compacted effect, can effectively be eliminated the settlement by soaking of inter-pile soil.
Because depth of pore forming is in 30 meters, the stake pane hammer of backfill is the handling of rolling formula 3-5 ton hoist engine, so the Ground Treatment degree of depth is not limit, guarantees in 30 meters.
The strength of the mixing pile height of this technology construction is because the weight backfill of use more than 1000 kilograms makes the pile body coefficient of consolidation greater than 1.And because stratum soft or hard inequality, and wait and ram the energy construction, so the cross section that this technology construction forms differs in size, be odd-shaped cross-section pile, pile body is shaped as sugarcoated haws, and pile body and inter-pile soil interlock are tight, increase pile side resistance, thereby improved Bearing Capacity of Composite Foundation.The Bearing Capacity of Composite Foundation characteristic value can reach 500kpa.
Because the boring-tamping cement-soil compacting stake has above advantage, so range of application is more wide, and because the bearing capacity height, construction costs is low, it can replace the CFG stake and waits other similar stakes in the near future, obtains wide development, creates good economic benefit and social benefit.
The present invention is described further below in conjunction with the drawings and specific embodiments.
Description of drawings
Accompanying drawing is the working procedure figure of the embodiment of the invention.
The specific embodiment:
The work progress of boring-tamping cement-soil compacting stake is:
At first fetch earth and form the hole of 5-11 rice diameter, the long design of stake is short, below 7 meters, adopts the mechanically drived luoyang shovel pore-forming, the long design of stake is long, in more than 7 meters 30 meters, can adopt the spiral drilling machine pore-forming, after depth of pore forming and hole perpendicularity meet the requirements on inspection, the empty rammer at the bottom of using the stake pane hammer to the hole earlier, begin filler then, with stake pane hammer compaction in layers backfill, until the absolute altitude that repeats to be backfilling into design.
----vertical correction--pore-forming------------the empty rammer----filler----compacting------binding-----stake machine displacement that pile driver is in place that material mixes and stirs that boring machine is in place that sequence of construction is as follows: construction is put and tested line.
Stake hole centre deviation is less than 1/4 of stake footpath design load, and less than 1/6 of stake footpath design load, the vertical degree of the peg hole deviation should be greater than 1.5% to strip foundation, and the empty back stake hole depth that rams is greater than stake hole projected depth, and pile body diameter is greater than design stake footpath behind the pile.
Be the intensity of assurance pile crown and the compacted effect of pile crown part inter-pile soil, must more than stake top mark height, stay the reservation soil layer of 0.6-1.2 rice during construction.
Carry the hammer height and backfill lift height and hammer number of the backfill of stake pane hammer are determined by test pile.
The pile body coefficient of consolidation is greater than 0.97.
Backfilling material is that the compound that cohesive soil and Portland cement are evenly mixed system by a certain percentage is a cement-soil.
Compound is answered uniform mixing, the tone unanimity.
Earth material adopts cohesive soil and silt, and organic content is no more than 5% in the earth material, must not contain expansive soil.
The water content of compound and optimum water content allowable variation are ± 2%.
Should in 4 hours, be used for pile after compound mixes and stirs, must not put for a long time.
Must tamp at the bottom of the hole during filler in the hole, a raising degree is rammed on the stake top should be high more than 0.5 meter greater than design stake top mark.
In the work progress, should there be the special messenger to monitor the quality of pore-forming and backfilling compaction, and carries out construction note.As when finding that ground soil property and prospecting data are not inconsistent, should find out situation, take effective treatment measures.
Should take rainproof antifreezing measures when Pluvial or winter construction, prevent that earth material and cement are drenched by rainwater or freezes.
Selecting for use of equipment:
Pore-forming equipment: stake is long below 7 meters, adopts the mechanically drived luoyang shovel pore-forming, in long 30 meters of the stake, adopts the long-spiral drilling machine pore-forming.
Piling-backfilling equipment: put forward the demand of hammer height when bracket height will satisfy backfill, carrying the hammer height must not be less than 4 meter.Promoting hoist engine is rolling formula 3-5 ton hoist engine.
Backfill stake pane hammer: material is 45# cast steel, and is solid, requires weight more than 1000 kilograms, according to, the construction needs be divided into 1000 kilograms, 1300 kilograms, 1500 kilograms and 1800 kilograms.The hammer shaped upper part is a cylinder, and lower shape is a toe.
Claims (8)
1, boring-tamping cement-soil compacting pile construction method is characterized in that comprising the following steps: that fetch earth with pore-forming equipment (1) forms the hole of 5-11 rice diameter; (2) check depth of pore forming and hole perpendicularity; (3) after depth of pore forming and hole perpendicularity meet the requirements, earlier with piling-backfilling equipment to the hole at the bottom of empty the rammer, begin filler then, with piling-backfilling equipment compaction in layers backfill, until the absolute altitude that repeats to be backfilling into design.
2, boring-tamping cement-soil compacting pile construction method according to claim 1, it is characterized in that described pore-forming equipment selects according to the design length of stake, the long design load of stake is below 7 meters, adopt motor-driven shovel pore-forming, the long design load of stake adopts the long-spiral drilling machine pore-forming in more than 7 meters 30 meters the time.
3, boring-tamping cement-soil compacting pile construction method according to claim 1 and 2, it is characterized in that described piling-backfilling equipment by frame, promote hoist engine and backfill stake pane hammer is formed, hoist engine drives backfill stake pane hammer by frame and moves.
4, boring-tamping cement-soil compacting pile construction method according to claim 3, when will satisfying backfill, the bracket height that it is characterized in that described piling-backfilling equipment puies forward the demand of hammer height, carry the hammer height greater than 4 meters, promoting hoist engine is rolling formula 3-5 ton hoist engine, backfill stake pane hammer shaped upper part is a cylinder, lower shape is a toe, and material is a 45# cast steel solid construction, and weight is more than 1000 kilograms.
5, boring-tamping cement-soil compacting pile construction method according to claim 4 is characterized in that the empty back stake hole depth that rams greater than stake hole projected depth, and pile body diameter has well closely effect greater than design stake footpath to inter-pile soil behind the pile.
6, boring-tamping cement-soil compacting pile construction method according to claim 5 must stay the reservation soil layer of 0.6-1.2 rice more than stake top mark height when it is characterized in that constructing.
7, boring-tamping cement-soil compacting pile construction method according to claim 6 is characterized in that the pile body coefficient of consolidation is greater than 0.97.
8, boring-tamping cement-soil compacting pile construction method according to claim 7, it is characterized in that backfilling material is that the compound that cohesive soil and Portland cement are evenly mixed system is a cement-soil, earth material adopts cohesive soil and silt, organic content is less than 5% in the earth material, and the water content of compound and optimum water content allowable variation are ± 2%.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200510017522 CN1676763A (en) | 2005-04-18 | 2005-04-18 | Boring-tamping cement-soil compacting pile construction method |
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| CN 200510017522 CN1676763A (en) | 2005-04-18 | 2005-04-18 | Boring-tamping cement-soil compacting pile construction method |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102162246A (en) * | 2011-05-18 | 2011-08-24 | 中铁西北科学研究院有限公司 | Vibration-less compaction method of collapsible loess foundation |
| CN105369803A (en) * | 2015-12-02 | 2016-03-02 | 陕西聚源基础工程有限公司 | Device and method based on static pressure immersed tube hole forming heavy hammer tamping compaction pile |
| CN113006043A (en) * | 2021-03-04 | 2021-06-22 | 苏州科大岩土工程技术有限公司 | Construction method of plain soil compaction pile |
-
2005
- 2005-04-18 CN CN 200510017522 patent/CN1676763A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102162246A (en) * | 2011-05-18 | 2011-08-24 | 中铁西北科学研究院有限公司 | Vibration-less compaction method of collapsible loess foundation |
| CN102162246B (en) * | 2011-05-18 | 2012-09-19 | 中铁西北科学研究院有限公司 | Vibration-less compaction method of collapsible loess foundation |
| CN105369803A (en) * | 2015-12-02 | 2016-03-02 | 陕西聚源基础工程有限公司 | Device and method based on static pressure immersed tube hole forming heavy hammer tamping compaction pile |
| CN113006043A (en) * | 2021-03-04 | 2021-06-22 | 苏州科大岩土工程技术有限公司 | Construction method of plain soil compaction pile |
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