CN104947664A - Thick stone sea-filling layer prestressing force high-strength concrete square pile construction method - Google Patents
Thick stone sea-filling layer prestressing force high-strength concrete square pile construction method Download PDFInfo
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- CN104947664A CN104947664A CN201510384615.3A CN201510384615A CN104947664A CN 104947664 A CN104947664 A CN 104947664A CN 201510384615 A CN201510384615 A CN 201510384615A CN 104947664 A CN104947664 A CN 104947664A
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Abstract
The invention belongs to a thick stone sea-filling layer prestressing force high-strength concrete square pile construction method. The thick stone sea-filling layer prestressing force high-strength concrete square pile construction method comprises the construction steps of level measuring, positioning, hole guiding, square pile type selecting and pile sinking and constructing; the hole guiding step adopts a down hole hammer drilling technology, the aperture of the guiding hole is smaller than the side length of a square pile, the pile sinking step adopts a diesel oil rod guiding hammer, and a prefabricated prestressing-force high-strength concrete solid square pile with a steel pile head is utilized. The method has the advantages that the hole forming speed is high, the construction cycle is short, and the construction cost is saved by more than 10%. By means of a preguiding hole, pile sinking resistance of a back-filling layer is reduced, the rock entering depth is improved, the prefabricated prestressing-force high-strength concrete solid square pile with the steel pile head is used to squeeze the hole wall of a pile hole, and the side resistance and bearing capacity of a pile body are improved.
Description
Technical field
The present invention relates to the realm of building construction, be applicable to the infrastructure of highrise building and building surface in big industrial factory on reclaimed land, a kind of solve thick close stone and fill out extra large layer and draw hole pile sinking construction method in advance, be exactly a kind of adopt down-hole hammer to draw hole after squeeze into the combination engineering method of precast prestressed high-strength concrete solid square pile.
Technical background
With the high speed development of coastal economy band, marine reclamation land becomes effective settling mode of soil scarcity, limit by regional condition, fill out the native difference in sea very large, generally the rubble of leveling off hilltops that mostly uses with good conditionsi is filled, and large-sized workshop is according to particular/special requirement, select the particle diameter of mountain stone larger, and adopt super strong rammer, form thick close macadam, generally can reach tens meters even tens meters.
The groundwater table in these soils is higher, and is communicated with seawater, and water level changes by the impact of tide, and seawater is comparatively large to the impact on basis, corrosion, to the selection of stake and construction requirement higher.
Under above-mentioned geological conditions, adopt digging hole filling pile, pile tube and common prestress square pile to be difficult to ensure pile quality and life requirement, directly adopt conventional pile-sinking method to be difficult to penetrate thick close rubble and fill out extra large layer.
Summary of the invention
For solving an above construction technology difficult problem, the invention provides a kind of thick close stone and filling out extra large layer and draw hole sinking construction technology in advance, be exactly a kind of adopt down-hole hammer to draw hole after squeeze into the combination engineering method of precast prestressed high-strength concrete solid square pile.
The present invention is achieved through the following technical solutions:
A kind of thick close stone fills out extra large layer prestress high intensity concrete square pile construction method, comprises measure of pile position, locates, draws hole, piling construction step, wherein:
1, draw hole construction: adopt DTH drilling technique, select 120 type down-the-hole drills of Luanzhou City heavy industry, supporting 2 XHP1170 air compressor machines, down-hole hammer diameter is less than the square pile length of side, preferably, when the square pile length of side is 600mm, down-hole hammer diameter 500mm, according to filling out extra large layer geological condition, down-hole hammer diameter can be selected by the 40%-90% of the square pile length of side, after down-hole hammer down-hole hammer driller insertion, adjust pile frame verticality, make drilling tool, unit head and position, hole sight alignment, guarantee that perforate verticality is accurate, in DTH drilling process, drill bit is carried out impact chisel to rubble at the bottom of hole continuously and is entered, stone is broken under drill bit impact effect, broken stone flour to be blown off at the bottom of hole by the pressure-air of Pipeline transport bottom down-hole hammer by drilling rod center and by the space delivery port down-hole hammer drilling rod and casing, until draw hole to penetrate Backfilled Stone Layer, down-hole hammer and casing are extracted, detect stake holes, determine that qualified rear rig displacement is abdicated and draw hole site.
2, square pile is selected: the special geologic condition filling out extra large layer according to thick close stone; design and produce the precast prestressed high-strength concrete solid square pile of band steel pile tip; the square pile length of side is selected by designing requirement; concrete strength is C60 ~ C80; protective layer thickness is 50mm, and report is surveyed in the long base area of stake and construction requirement is determined.
3, piling construction: pile driver moves to stake position, pile monkey is mentioned, hang stake simultaneously, pile crown is made to enter in hammer cap, adjustment pile frame, pile top being aimed at stake holes goes forward side by side in hand-hole, the verticality of adjustment stake, guarantee that pile verticality is accurate, misfire and carry hammer by deadweight hammering pile crown, make pile top hand-hole certain depth, anchor spike starts normal pile sinking after one's death, to use in pile driving process that weight is low to be beaten, control fuel delivery to reduce hammering energy, strengthen impact energy gradually, maximum height of the fall controls below 3 meters, hammering FREQUENCY CONTROL is within 35-50/min, hammer piling is to the embedded depth of stake with passing through when people's degree all meets designing requirement, pile driver is moved to next position.
Adopt technique scheme of the present invention, compared with prior art there is following effect:
1, reclaim fields from the sea formed construction land, rubble of leveling off hilltops mostly is used to fill, large-sized workshop is according to particular/special requirement, select the particle diameter of mountain stone larger, and adopt super strong rammer, form thick close macadam, generally can reach tens meters even tens meters, direct piling construction cannot carry out, revolve to dig and draw hole performance difficulty, adopt borehole mode due to precipitation difficulty dangerous, cost is very high, down-hole hammer of the present invention is adopted to draw hole sinking construction technology, Solve problems in construction preferably, there is pore-forming, pile sinking speed is fast, safe and reliable feature, with digging hole filling pile Construction Comparison, construction cost more than 15% can be reduced.
2, the precast prestressed high-strength concrete solid square pile of select tape steel pile tip of the present invention; concrete strength is C60 ~ C80; pile body anti-strike ability and penetration capacity are 1.5 times of common prestress square pile; draw hole depth and penetrate Backfilled Stone Layer; reduce and draw hole cost about 50%, selected pile-type protective layer thickness, at 50mm, has corrosion resistance strong compared with common prestress square pile; the distinguishing feature that bearing capacity is large, single pile bearing capacity reaches 5000KN.
3, the present invention adopts the precast prestressed high-strength concrete solid square pile of band steel pile tip, because concrete strength is C60 ~ C80, coordinate steel pile tip, when pile body is not damaged to the pile hole extruding-extending pile sinking being less than the square pile length of side, lateral resistance can be added, improve the uplift resistance of pile body, compare with pile for prestressed pipe, omit retaining wall pouring construction link, save pouring material, shorten the engineering time.
Accompanying drawing explanation
Fig. 1 is present invention process flow chart;
Fig. 2 is that the present invention draws aperture, hole and stake length of side schematic diagram;
Fig. 3 is the sectional drawing of Fig. 2;
In Fig. 3,1 is the precast prestressed high-strength concrete solid square pile of steel pile tip, and 2 for drawing hole, and 3 fill out extra large layer for thick close stone, and 4 is steel pile tip, and 5 is seabed original soil.
Detailed description of the invention
Below in conjunction with drawings and Examples, the invention will be further described, and object is only to understand content of the present invention better.Therefore, the cited case does not limit the scope of the invention.
As shown in the figure, the thick close stone described in the embodiment of the present invention fills out extra large layer prestress high intensity concrete square pile construction method, carries out in the steps below:
1, measure of pile position and location
The measurement of coordinates control point arranged in place according to owner is benchmark, utilize rangefinder, pass through coordinate transformation, corner, range finding, fixed point, release the Center stake of often organizing stake and the stake position of arbitrary with Center stake coaxial line one by one, often organizes other positions of stake then according to working drawing, the Center stake that utilization has been released and the reference stake with Center stake coaxial line, release one by one with invar tape, often organize stake position timber and hammer in soil layer, and to cross mark with red and blue pencil.
2, down-hole hammer is in place
Down-hole hammer rig, before displacement, must check preparation construction area place in advance, watch the degree of compaction in place, planeness.Down-the-hole pile machine equipment assembly, accessory weight is large, body is long, needs 50 tons of crawler crane to coordinate during assembling.Down-hole hammer driller insertion, adjusts pile frame verticality in 0.03 scope, and the necessary sight alignment in drilling tool, unit head and position, hole, guarantees that perforate verticality is accurate.Rig is being executed in drill-through journey, and the verticality of special messenger to rig must be sent to observe, and ensureing that verticality is in 0.03 scope, when there are abnormal conditions, must stop construction immediately.
3, DTH drilling
In DTH drilling process, the pressure-air being the 2.5MPa that XHP1170 air compressor machine produces by model is transported to down-hole hammer by pipeline and drilling rod centre bore, drives the piston in down-hole hammer cylinder body to do high-frequency reciprocating motion.And the kinetic energy this motion produced is delivered on drill bit continuously, drill bit is made to obtain ballistic work, drill bit is under the effect of ballistic work, carry out impact chisel to hole bed rock stone continuously to enter, stone is under the effect of this drill bit impact merit, fragmentation, broken stone flour to be blown off at the bottom of hole by the pressure-air of Pipeline transport bottom down-hole hammer by drilling rod center and by the space delivery port down-hole hammer drilling rod and casing, draws hole depth until complete.Cut a hole into process in, down-hole hammer equipment carries and controls verticality function, can ensure the verticality of pore-forming.
In order to prevent hole deviation, if when finding in percussion drilling that the anti-quantity of slag is few or percussion drilling efficiency is low or hole wall is unstable, several times short distance is answered to carry drilling tool, in case collapsing and breaking is so that bury drills stick of tool accident occurs.Namely percussion drilling punches Backfilled Stone Layer after extremely designing hole depth, and drilling tool vertical down speed may change quickening suddenly, now should consider to stop percussion drilling, and is back and forth carried up and down by drilling tool to the smooth and easy proposition casing aperture of drilling tool energy.For preventing intaking in down-hole hammer, when carrying drilling tool up and down, air feed don't be stopped.When running into boulder and cobble, erratic boulder in percussion drilling, during backfill stone stratum not of uniform size, boulder and cobble or backfill stone are by after impact drilling tool extruding, probably to roll displacement, even extrude, steering drilling tool drill bit, as easy as rolling off a logly cause boring off normal, thus cause square pile to be difficult to squeeze into or run-off the straight even broken pile, in this section stratum in percussive drilling construction, the conservative practice of " slow two low three gently presses " during perforate, to be taked.Keeping indirectly carrying drilling tool up and down, its objective is as preventing collapsing and breaking by drilling rod locking, is on the other hand to remove in hole wall unstable " probe stone " in case stick of tool.Pore-forming points for attention meet boulder, stop boring and protect
Hold air feed, and short distance gently press hang up and beat, original position back and forth puies forward this process of drilling tool up and down and is no less than three times.
4, down-hole hammer and casing are extracted
Rotation limit, limit upwards lifts drilling rod, utilizes 4 the uniform rotary drills extended out bottom tup to nibble and is extracted by casing simultaneously.
5, pore-forming and stake holes detect
Within pore-forming position deviation 50mm, and be no more than 5% of stake position design load;
Hole depth deviation ± 100mm(ensures through Backfilled Stone Layer);
Pore-forming perpendicularity deviation is within 1% of hole depth.
6, down-hole hammer rig displacement
Determine that the displacement of down-hole hammer rig is abdicated and drawn hole site after qualified by pore-forming.
7, square pile designs and produces
The special geologic condition of extra large layer is filled out according to thick close stone; design and produce the precast prestressed high-strength concrete solid square pile of band steel pile tip; the square pile length of side is selected by designing requirement; concrete strength is C60; concrete strength can be brought up to C80 as required; protective layer thickness is 50mm, and report is surveyed in the long base area of stake and construction requirement is determined.
8, stake handling
According to construction speed requirement, the precast prestressed high-strength concrete solid square pile of band steel pile tip is transported to stake position, pile crown is in pile monkey side, and pile top is outside, facilitates pile driver to lift by crane, and when the long body of stake is long, uses crawler crane to coordinate and hangs stake.
9, stake position is checked
Before pile driver is in place, need check stake holes position, stake holes can enter piling construction within the scope of allowable variation, otherwise again should draw hole.
10, pile driver is in place
Mobile pile driver, makes monkey of pile driver align piles hole site.
11, pile sinking
Pile monkey is mentioned, hang stake simultaneously, pile crown is made to enter in hammer cap, adjustment pile frame, pile top being aimed at stake holes goes forward side by side in hand-hole, the verticality of adjustment stake, guarantee that pile verticality is accurate, misfire and carry hammer by deadweight hammering pile crown, make pile top hand-hole certain depth, anchor spike starts normal pile sinking after one's death, to use in pile driving process that weight is low to be beaten, control fuel delivery to reduce hammering energy, strengthen impact energy gradually, maximum height of the fall controls below 3 meters, hammering FREQUENCY CONTROL is within 35-50/min, hammer piling is to the embedded depth of stake with passing through when people's degree all meets designing requirement,
12, pile extension
As needed pile extension in pile driving process, pile extension should require rapidly, and shortening stops the time of beating as far as possible, and as stopped beating overlong time, then surrounding soil recovers stake is not easily squeezed into.This example adopts welded type pile crown structure, and steel using amount is less, manufactures more convenient.
13, pile follower
When pile crown still must continue to sink to, then need pile follower.Pile feeder should have enough strength and stiffness, and its length is the pile monkey minimum absolute altitude that may reach and the difference estimating the absolute altitude that stake top is sunk to, and adds suitable surplus.Pile feeder rigidity should as far as possible close to pile body stiffness, and resistance when pulling out on should considering as far as possible to reduce; Pile feeder should adapt with pile-type, and pile cover should overlap people's stake top 30 ~ 40cm.During pile follower, in pile follower process, should guarantee that pile monkey, Pile feeder and pile body are on same central axis.
14, pile driver displacement
Mobile pile driver, moves to next position by pile driver.
Claims (1)
1. thick close stone fills out an extra large layer prestress high intensity concrete square pile construction method, it is characterized in that, comprises measure of pile position, locates, draws hole, piling construction step, wherein:
(1
), draw hole construction: adopt DTH drilling technique, select 120 type down-the-hole drills of Luanzhou City heavy industry, supporting 2 XHP1170 air compressor machines, down-hole hammer diameter is less than the square pile length of side, preferably, when the square pile length of side is 600mm, down-hole hammer diameter 500mm, according to filling out extra large layer geological condition, down-hole hammer diameter can be selected by the 40%-90% of the square pile length of side, after down-hole hammer driller insertion, adjust pile frame verticality, make drilling tool, unit head and position, hole sight alignment, guarantee that perforate verticality is accurate, in DTH drilling process, drill bit is carried out impact chisel to rubble at the bottom of hole continuously and is entered, stone is broken under drill bit impact effect, broken stone flour to be blown off at the bottom of hole by the pressure-air of Pipeline transport bottom down-hole hammer by drilling rod center and by the space delivery port down-hole hammer drilling rod and casing, until draw hole to penetrate Backfilled Stone Layer, down-hole hammer and casing are extracted, detect stake holes, determine that qualified rear rig displacement is abdicated and draw hole site,
(2), square pile select: the special geologic condition filling out extra large layer according to thick close stone, design and produce the precast prestressed high-strength concrete solid square pile of band steel pile tip, the square pile length of side is selected by designing requirement, concrete strength is C60 ~ C80, protective layer thickness is 50mm, and report is surveyed in the long base area of stake and construction requirement is determined;
(3), piling construction: pile driver moves to stake position, pile monkey is mentioned, hang stake simultaneously, pile crown is made to enter in hammer cap, adjustment pile frame, pile top being aimed at stake holes goes forward side by side in hand-hole, the verticality of adjustment stake, guarantee that pile verticality is accurate, misfire and carry hammer by deadweight hammering pile crown, make pile top hand-hole certain depth, anchor spike starts normal pile sinking after one's death, to use in pile driving process that weight is low to be beaten, control fuel delivery to reduce hammering energy, strengthen impact energy gradually, maximum height of the fall controls below 3 meters, hammering FREQUENCY CONTROL is within 35-50/min, hammer piling is to the embedded depth of stake with passing through when people's degree all meets designing requirement, pile driver is moved to next position.
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| CN201510384615.3A CN104947664A (en) | 2015-06-30 | 2015-06-30 | Thick stone sea-filling layer prestressing force high-strength concrete square pile construction method |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107460868A (en) * | 2016-06-02 | 2017-12-12 | 宜兴市周铁镇生力钻探机械厂 | A kind of prefabricated pile part soil compaction process for sinking |
| CN111474602A (en) * | 2020-05-26 | 2020-07-31 | 浙江中咨交通科技有限公司 | Rock mass collapse monitoring method |
| CN112609692A (en) * | 2020-12-09 | 2021-04-06 | 中铁二十局集团第六工程有限公司 | Construction method of prestressed pipe pile in complex geological area filled with sea |
| CN113338940A (en) * | 2021-06-29 | 2021-09-03 | 中国科学院武汉岩土力学研究所 | Small-caliber rectangular-section shaft heading machine cutter head suitable for hard rock |
| CN114704202A (en) * | 2022-03-23 | 2022-07-05 | 保利长大工程有限公司 | Construction method of bare rock geological pile foundation |
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| KR20100124165A (en) * | 2009-05-18 | 2010-11-26 | (주)삼오기초건설 | Shoe for phc pile |
| CN102966104A (en) * | 2012-11-27 | 2013-03-13 | 中国水利水电第七工程局有限公司 | Method for forming compaction pile by vibrating sinking pipe by composite hammer |
| CN103290840A (en) * | 2013-07-02 | 2013-09-11 | 二十二冶集团天津建设有限公司 | Prestressed pipe pile construction method under boulder group geological conditions |
| CN203229953U (en) * | 2013-04-16 | 2013-10-09 | 合肥建工集团有限公司 | Construction structure with guide hole and gravel bed penetrated by sunk pile |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107460868A (en) * | 2016-06-02 | 2017-12-12 | 宜兴市周铁镇生力钻探机械厂 | A kind of prefabricated pile part soil compaction process for sinking |
| CN111474602A (en) * | 2020-05-26 | 2020-07-31 | 浙江中咨交通科技有限公司 | Rock mass collapse monitoring method |
| CN111474602B (en) * | 2020-05-26 | 2020-10-23 | 浙江中咨交通科技有限公司 | Rock mass collapse monitoring method |
| CN112609692A (en) * | 2020-12-09 | 2021-04-06 | 中铁二十局集团第六工程有限公司 | Construction method of prestressed pipe pile in complex geological area filled with sea |
| CN113338940A (en) * | 2021-06-29 | 2021-09-03 | 中国科学院武汉岩土力学研究所 | Small-caliber rectangular-section shaft heading machine cutter head suitable for hard rock |
| CN114704202A (en) * | 2022-03-23 | 2022-07-05 | 保利长大工程有限公司 | Construction method of bare rock geological pile foundation |
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Application publication date: 20150930 |