CN101333812B - Grouter for back side grouting and its construction method - Google Patents
Grouter for back side grouting and its construction method Download PDFInfo
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- CN101333812B CN101333812B CN 200810041358 CN200810041358A CN101333812B CN 101333812 B CN101333812 B CN 101333812B CN 200810041358 CN200810041358 CN 200810041358 CN 200810041358 A CN200810041358 A CN 200810041358A CN 101333812 B CN101333812 B CN 101333812B
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Abstract
The invention relates to a pile side post-grouting grouting device and the construction method thereof, including a ground grouting device and an underground grouting device; the underground grouting device is composed of a pile body grouting guide pipe and an inner pile grouting device; both ends of the pile body grouting guide pipe are connected with the ground conveying pipe and the pile side grouting device; the pile body grouting guide pipe is distributed along the grouting section, fixedly bound with the main rib of the steel reinforcement cage and is arranged in a drilled hole togetherwith the steel reinforcement cage; the pile side grouting device is composed of an annular high-pressure hose and a grouting device; the annular high-pressure hose is communicated with the pile body grouting guide pipe and is fixedly connected with the bored pile steel reinforcement cage. During the pile forming process of the bored pile, the pile side post-grouting grouting device and the construction method prearrange the grouting pipelines on a plurality of positions on the pile body, distribute the annular high-pressure hose outside the grouting section and mount the grouting device; a high-pressure grouting pump is adopted when pile body concrete reaches certain strength; the cement grout is injected into the pile lateral through the grouting pipelines to improve the pile lateral mudcover; the pile lateral soil mass intensity is improved at the same time, so as to improve the bearing capacity of the pile and reduce the skirt pile settlement.
Description
Technical field
The present invention relates to a kind of grouting device and construction technology thereof that is specifically designed to the grouting behind shaft or drift lining in bored pile construction, particularly relate to a kind of slurry casting machine and construction technology thereof of the grouting behind shaft or drift lining for the stake side.
Background technology
" approximately 30368.27 square metres of " center " project base, the Shanghai gross areas; approximately 430,000 square metres of overall floorages are planned to build the main building height and are about 580 meters, are the Super High skyscraper; the underground garage buried depth is estimated approximately 25～30m, and the foundation ditch of construction belongs to the one-level deep big foundation pit.
Be fixed pile peripheral earth, increase bearing capacity of single pile and reduce the skirt piles sedimentation, this engineering test pile will carry out a rear flank slip casting.4 road slip casting sections are set in the long scope of stake, and per pass section injected hole quantity is no less than 4, per pass slip casting section cement consumption 500kg.Pressure and grouting amount dual control.
At present, still lack ripe stake side slip casting experience and corresponding equipment, need to introduce special-purpose high strength composite pipe for this reason, be used for processing annular slip casting pipe valve.And adopt corresponding grouter for back side grouting, be combined in simultaneously the successful experience of track traffic credit magnificent way station project Lateral slip casting, and sum up reasonably stake rear flank grouting process of a cover.
Summary of the invention
The present invention will provide a kind of rear flank grouting device and job practices thereof, and this grouting device and job practices thereof can improve bearing capacity of single pile, reduce the skirt piles settling amount.
For achieving the above object, technical scheme of the present invention is as follows:
A kind of rear flank grouting device comprises surface grout injection device and grouting device two large divisions, and the surface grout injection device is comprised of stake side grouting pump, slurry agitation machine, slurry storing tank, ground carrier pipe and observing apparatus; Be characterized in: the grouting device is comprised of pile body grouting pipe and stake side grouting device, wherein, pile body grouting pipe two ends be tightly connected respectively ground carrier pipe and a stake side grouting device, and arrange along the slip casting section, fix with the colligation of reinforcing cage master muscle, hole with putting under reinforcing cage: stake side grouting device is comprised of annular high-pressure hose, slurry casting machine, and its annular high-pressure hose is communicated with the pile body grouting pipe, and is fixedly connected with drilled pile reinforcing cage.
Output pressure 〉=the 7MPa of stake side grouting pump, discharge capacity is 50～250L/min; The ground carrier pipe bears pressure 〉=2 times grouting pressure, its length≤50m.
An a kind of rear flank grouting construction method of using grouter for back side grouting comprises following concrete steps:
1. stake side grouting device is installed
In formation of pile, preset the grouting pipe road in pile body a plurality of positions, and arrange annular high-pressure hose outside the slip casting section, slurry casting machine is installed; After drilled pile reinforcing cage is in place, connect surface grout injection system, press clear water, annular high-pressure hose is opened and be close to hole wall;
2. slip casting
After pour concrete intensity reaches 70%, open stake side grouting pump, slurries directly inject soil layer by the pile body grouting pipe through the one way valve of annular high-pressure hose and slurry casting machine;
In above-mentioned steps, after pour concrete, carry out the clear water splitting within 12 hours, get through the slurry casting machine one way valve;
In above-mentioned steps, as grouting pressure＞2MPa and held lotus 3 minutes, adopt intermittently grouting mode, and grouting amount reach the design grouting amount the time, stop slip casting.
The invention has the beneficial effects as follows: in the drilled pile formation of pile, adopt grouter for back side grouting and job practices thereof, preset grouting pipeline in pile body a plurality of positions, and arrange annular high-pressure hose the slip casting section outside, the installation slurry casting machine; After concrete piles reaches some strength (70%), rear employing high-pressure injection pump injects cement grout by grouting pipeline to stake side week, the improvement mud cake around pile, and stake side soil strength is improved simultaneously, thereby improves bearing capacity of single pile, reduces the skirt piles settling amount.
Description of drawings
Fig. 1 is the structural representation of of the present invention rear flank grouting device;
Fig. 2 is the installation schematic cross-section of stake rear flank grouting device of the present invention and high-pressure hose (before pressurization);
Fig. 3 is the installation schematic cross-section of stake rear flank grouting device of the present invention and high-pressure hose (after pressurization);
Fig. 4 is of the present invention rear flank grouting construction process flow process.
The specific embodiment
Below in conjunction with specific embodiment, further set forth the present invention.Should be understood that these embodiment only to be used for explanation the present invention and be not used in and limit the scope of the invention.Should be understood that in addition those skilled in the art can make various changes or modifications the present invention after the content of having read the present invention's instruction, these equivalent form of values fall within the application's appended claims limited range equally.
As Fig. 1, shown in 2, of the present invention rear flank grouting device comprises surface grout injection device and grouting device two large divisions, and the surface grout injection device is comprised of stake side grouting pump 1, slurry agitation machine 2, slurry storing tank 3, ground carrier pipe and observing apparatus.The grouting device is comprised of pile body grouting pipe 4 and stake side grouting device.
Pile body grouting pipe 4 two ends be tightly connected respectively ground carrier pipe and a stake side grouting device, and arrange along the slip casting section, fix with 7 colligations of reinforcing cage master muscle, hole with putting under reinforcing cage; Stake side grouting device is comprised of annular high-pressure hose 6, slurry casting machine 5, and its annular high-pressure hose 6 is communicated with pile body grouting pipe 4, and is fixedly connected with drilled pile reinforcing cage.
Stake side mortar depositing construction facility are selected:
(1) grouting pump
Stake side slip casting is to the requirement of pump 1 that discharge capacity is little and pressure is high and steady, and the rated pressure of pump should be greater than 2 times of the maximum pressure that requires, simultaneously due to grouting behind shaft or drift lining open the plug requirement, more than the pump pressure maximum value requires 7MPa; Pump delivery is 50～250L/min, and minimum value (this engineering) should be not less than 32L/min.The product that meets above-mentioned requirements has: the SNS series grouting pump of Central-South metallurgical machinery factory, the 2TGZ/-60/210 type grouting pump of Jinxi grouting pump factory, the Ministry of Energy's Hangzhou SGB6-10 of boring mechanic manufactory charge pump etc.Unloader and pressure meter must be equipped with on grouting pump.
(2) slurry agitation facility
(3) pipe-line system
This system mainly is comprised of slurries ground conveying, must guarantee sealing.Carrier pipe must adopt the high-voltage tube that bears maximum grouting pressure more than 2 times or seamless steel pipe etc., and length should not surpass 50m.
(4) pile body grouting pipe
Pile body grouting pipe 4 is the transition tubing that connects ground carrier pipe and pile end concrete placing device, and material is black pipe.Arrange four according to the slip casting section.Pile body grouting pipe 4 should be connected firmly and seal, and fixes with 7 colligations of reinforcing cage master muscle, transfers in hand-hole with reinforcing cage.
(5) stake side grouting device
This device is the core component of whole stake side grouting construction technology, formed by annular high-pressure hose 6, slurry casting machine 5, its annular high-pressure hose 6 is communicated with pile body grouting pipe 4, and with fix at drilled pile reinforcing cage, after drilled pile reinforcing cage is in place, connect surface grout injection system, press clear water, annular high-pressure hose 6 is opened and be close to hole wall.During slip casting, slurries directly inject soil layer by pile body grouting pipe 4 through the one way valve of annular high-pressure hose 6 and slurry casting machine 5.This engineering 11 piles, every pile side wall grouting are 4 faces, and each face is by four slip casting points.
Stake rear flank grouting construction process flow process (Fig. 4) of the present invention:
1. stake side grouting device is installed
In formation of pile, preset grouting pipe road 4 in pile body a plurality of positions, and arrange annular high-pressure hose 6 (Fig. 2) outside the slip casting section, slurry casting machine 5 is installed; After drilled pile reinforcing cage is in place, connect surface grout injection system, press clear water, annular high-pressure hose 6 is opened and be close to hole wall (Fig. 3);
2. slip casting
After pour concrete intensity reaches 70%, open stake side grouting pump 1, slurries directly inject soil layer by pile body grouting pipe 4 through the one way valve of annular high-pressure hose 6 and slurry casting machine 5.
After pour concrete, carry out the clear water splitting within 12 hours, get through the slurry casting machine one way valve.
(1) stake side Construction technology of Pouring cement mortar parameter
Stake side mortar depositing construction parameter mainly comprises pump pressure, pump amount, slurries injection rate, slurry formula etc., and wherein pump pressure comprises out plug pressure, grouting pressure, termination pressure etc., and most important pump pressure is the clear water splitting in addition, gets through the control of slurry casting machine one way valve pressure.Above-mentioned pressure needs definite through testing on ground.
(2) pump pressure
Open the plug pump pressure according to the slurry casting machine form and settle the effect difference to change, generally in 1.0～1.5MPa left and right, to be considered as pipeline obstructed when pressure surpasses 7MPa.
Termination pressure is controlled at about 1.4～1.8MPa, if there are the design slurries not inject and pressure rising situation fully, suggestion is in the situation that guarantee that it is rational as the final pressure index that 3 times of design slurries injection 80% use are opened plug pressure.
(3) flow rate of grouting
The selection of pump amount will be satisfied the infiltration injection, and is more low better in theory, but considers the construction feasibility, this engineering is advisable with 32～47L/min, simultaneously will be with reference to the variation of pressure, in the situation that constant injection pressure is lower, can suitably strengthen the pump amount, otherwise should inject with low value.
(4) cement paste requirement
Cement adopts P42.5 level Portland cement, require simultaneously cement fresh, do not lump.
Every section cement consumption 500kg, the single pile grouting amount is 2.0t cement approximately, and water/binder ratio is 0.60～0.65, and mixing time is not less than 2 minutes.The cement grout that stirs filters with the filter screen that the aperture is not more than 3 * 3mm.
(5) single pile slip casting termination criteria
Carry out grouting amount and grouting pressure dual control, be controlled to be the master with grouting amount (cement consumption), grouting pressure is controlled to be auxiliary.
When grouting amount reaches designing requirement, can stop slip casting.
As grouting pressure＞2MPa and held lotus 3 minutes, adopt intermittently grouting mode, and grouting amount reach the design grouting amount the time, can stop slip casting.
Claims (4)
1. stake rear flank grouting device, comprise surface grout injection device and grouting device two large divisions, the surface grout injection device is by stake side grouting pump (1), slurry agitation machine (2), slurry storing tank (3), ground carrier pipe and observing apparatus form, it is characterized in that, described grouting device is comprised of pile body grouting pipe (4) and stake side grouting device, wherein, pile body grouting pipe (4) two ends be tightly connected respectively ground carrier pipe and a stake side grouting device, and arrange along the slip casting section, fix with reinforcing cage master muscle (7) colligation, hole with putting under reinforcing cage, stake side grouting device is comprised of annular high-pressure hose (6), slurry casting machine (5), and its annular high-pressure hose (6) is communicated with pile body grouting pipe (4), and is fixedly connected with drilled pile reinforcing cage, output pressure 〉=the 7MPa of described stake side grouting pump (1), discharge capacity is 50～250L/min, described ground carrier pipe bears pressure 〉=2 times grouting pressure, its length≤50m.
2. an application rights requires a rear flank grouting construction method of 1, it is characterized in that, comprises following concrete steps:
(1) stake side grouting device is installed
In formation of pile, preset pile body grouting pipe (4) in pile body a plurality of positions, and arrange annular high-pressure hose (6) outside the slip casting section, slurry casting machine (5) is installed; After drilled pile reinforcing cage is in place, connect surface grout injection system, press clear water, annular high-pressure hose (6) is opened and be close to hole wall;
(2) slip casting
After pour concrete intensity reaches 70%, open stake side grouting pump (1), slurries directly inject soil layer by pile body grouting pipe (4) through the one way valve of annular high-pressure hose (6) and slurry casting machine (5).
3. stake according to claim 2 rear flank grouting construction method, is characterized in that, in above-mentioned steps, after pour concrete, carries out the clear water splitting within 12 hours, gets through slurry casting machine (5) one way valve.
4. stake according to claim 3 rear flank grouting construction method, is characterized in that, in above-mentioned steps, as grouting pressure＞2MPa and held lotus 3 minutes, adopts intermittently grouting mode, and grouting amount stops slip casting when reaching the design grouting amount.
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| Application Number | Priority Date | Filing Date | Title |
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| CN 200810041358 CN101333812B (en) | 2008-08-04 | 2008-08-04 | Grouter for back side grouting and its construction method |
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| CN 200810041358 CN101333812B (en) | 2008-08-04 | 2008-08-04 | Grouter for back side grouting and its construction method |
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| CN101333812A CN101333812A (en) | 2008-12-31 |
| CN101333812B true CN101333812B (en) | 2013-06-12 |
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Families Citing this family (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102535452A (en) * | 2010-12-15 | 2012-07-04 | 王云艇 | Novel engineering pile |
| CN103174135B (en) * | 2011-12-23 | 2015-06-03 | 五冶集团上海有限公司 | Repair method of unqualified post-grouting bored concrete pile |
| CN103184737A (en) * | 2011-12-28 | 2013-07-03 | 上海市基础工程有限公司 | Grouting machine for post grouting under embedded rock geological condition |
| CN103114576A (en) * | 2013-02-05 | 2013-05-22 | 山西太行建设开发有限公司 | Post grouting construction method for cast-in-place concrete pile |
| CN104060613B (en) * | 2013-03-22 | 2016-04-20 | 上海市城市建设设计研究总院 | The directed slip casting structure of interlocking pile and interlocking pile directed grouting and reinforcing soil body method |
| CN103321214A (en) * | 2013-07-10 | 2013-09-25 | 南通华新建工集团有限公司 | Cast-in-place pile later slip casting construction method |
| CN104452746A (en) * | 2013-09-23 | 2015-03-25 | 中国建筑股份有限公司上海分公司 | Construction method for bored pile |
| CN105625303A (en) * | 2014-11-28 | 2016-06-01 | 大连市市政设计研究院有限责任公司 | Post-grouting technology for cast-in-situ bored pile |
| CN104631452A (en) * | 2015-01-14 | 2015-05-20 | 刘林松 | Device for regulating and controlling contact and interaction between pile and earth |
| CN105386453A (en) * | 2015-10-16 | 2016-03-09 | 上海市基础工程集团有限公司 | Grouting process for preventing secondary settlement of open caisson |
| CN105386451A (en) * | 2015-10-16 | 2016-03-09 | 上海市基础工程集团有限公司 | Grouting device for preventing secondary sinking of open caisson |
| CN105804052A (en) * | 2016-05-06 | 2016-07-27 | 同济大学 | Grouting pipeline structure, X-shaped special-shaped pile for prefabricating grouting pipeline and grouting method thereof |
| CN105804083A (en) * | 2016-05-06 | 2016-07-27 | 同济大学 | Grouting pipeline device, conical special-shaped pile and application method thereof |
| CN106088086A (en) * | 2016-08-08 | 2016-11-09 | 中国电建集团贵阳勘测设计研究院有限公司 | The pile body post-mud-jacking bored pile of karst area deep foundation pit fender post supporting |
| CN110700266A (en) * | 2019-10-11 | 2020-01-17 | 重庆建工建筑产业技术研究院有限公司 | Underground continuous wall toe post-grouting construction method |
| CN112900440A (en) * | 2021-01-21 | 2021-06-04 | 中国三峡新能源(集团)股份有限公司 | Grouting system for enhancing bearing capacity of offshore wind power pile foundation and construction method |
| CN113737782B (en) * | 2021-09-14 | 2022-09-27 | 黄杰 | Synchronous forming method for anticorrosive protection layer of cast-in-situ bored pile |
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| CN1540104A (en) * | 2003-10-30 | 2004-10-27 | 北京城建集团有限责任公司 | Post mudjack construction technics for sidewal and bottom of bore of filling pile |
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