CN101871214A - Foundation pit support and construction method for cement mixing pile inserted with Y type precast pile - Google Patents
Foundation pit support and construction method for cement mixing pile inserted with Y type precast pile Download PDFInfo
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- CN101871214A CN101871214A CN200910173222A CN200910173222A CN101871214A CN 101871214 A CN101871214 A CN 101871214A CN 200910173222 A CN200910173222 A CN 200910173222A CN 200910173222 A CN200910173222 A CN 200910173222A CN 101871214 A CN101871214 A CN 101871214A
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Abstract
The invention discloses a foundation pit support and construction method for a cement mixing pile inserted with a Y type pile, which is characterized by comprising the following construction steps of: (1) excavating a groove; (2) enabling the cement mixing pile to be in position; (3) constructing the cement mixing pile, wherein the lifting speed of a stirrer is 0.8-1m/min, and the pressure of a guniting pump is controlled at 0.4-0.6MPa; for sandy siltseam soil, firstly, pressing swelling soil slurry prepared according to a certain proportion, and then, jetting cement slurry; (4) inserting a Y type precast pile, wherein the construction on the Y type precast pile inserted into the mixing pile needs to be completed in 4h after the mixing pile is formed; (5) manufacturing a circuit purlin; and (6) constructing steel bracings, connecting the bracings to the circuit purlin at the pit edge, and applying prestress for fixing, wherein when the distance between the steel bracings is longer than 20m, adjustable devices except splay bracings are adopted at the prestress applying end. The invention has the characteristics of water and soil blocking, simple processes, convenient operation, short construction cycle, stronger anti-leakage capacity, reduction of construction cost and the like, and is suitable for various soil layers.
Description
Technical field
The present invention relates to building field, particularly the cement mixing pile pattern foundation pit supporting structure and the job practices of pile inserted with Y type precast.
Background technology
Traditional pattern foundation pit supporting structure mode adopts band support formula campshed wall in conjunction with water-stop curtain, adding concrete as bored pile supports, the stake back adopts cement mixing pile to form the mode of going along with sb. to guard him of water-stop curtain, can control the space enclosing structure distortion preferably, the stable of system gone along with sb. to guard him in assurance, and for the narrow and small place of working face, pile foundation construction is difficult for carrying out and difficult quality guarantee, and this support pattern adopted bored pile and two kinds of stake types of cement mixing pile, and cost is higher relatively.Generally row construction again after the cement mixing pile construction of bored pile, the construction period is longer.
Summary of the invention
Purpose of the present invention provides a kind of cement mixing pile pattern foundation pit supporting structure and job practices of pile inserted with Y type precast, and unnecessary construction drill castinplace pile solves that bored pile construction is subjected to condition restriction, cost height, slow problem of duration in traditional pattern foundation pit supporting structure.
Construction sequence of the present invention comprises:
(1) excavation groove
According to bracing of foundation pit inner edge control line, remove underground obstacle and excavate groove.
(2) cement mixing pile is in place
Agitation pile pile frame perpendicularity deviation is not more than 1%.Welding one radius is the iron ring of 5cm on pile frame, and the 10m eminence hangs a plummet, utilizes transit alignment drilling rod verticality, makes plummet just in time by the iron ring center.Must suitably regulate drilling rod before each construction, make plummet be positioned at iron ring, promptly the drilling rod error of perpendicularity is controlled in 0.5%.
(3) cement mixing pile construction
The mixer hoisting velocity is 0.8～1m/min, and spray pump pressure is controlled at 0.4～0.6MPa.For sandy silt layer soil property, be pressed into the expansive soil slurries of configuration by a certain percentage earlier, spray into cement paste again.
Less than 50 soil layer, adopt the multiple paddling process of compartment for the mark value of passing through; For being used to mark the soil layer of the value of passing through, adopt the multiple paddling process of continous way greater than 50.
Adjacent cement mixing pile lapping time should as surpassing 24h, then not increase grouting amount 20% greater than 24h when second cement mixing pile construction, hoisting velocity simultaneously slows down.
When finding abnormal conditions such as the cement mixing pile whitewashing is undesired in the work progress, can be in the peripheral piling of unusual cement mixing pile, overlap joint thickness is greater than 10cm.
(4) Y type preformed pile inserts
Y type preformed pile locator card is set on groove to be fixed, Y type preformed pile locator card is necessary firmly, level, then insert in the cement mixing method verticality of using transit or plumb bob control Y type preformed pile to insert with Y type preformed pile bottom centre center, align piles position and along locator card is vertical slowly.The Y type construction of prefabricated piles that inserts in the agitation pile must be finished in the 4h behind the agitation pile pile.
(5) enclosing purlin makes
The cement mixing pile of pile inserted with Y type precast connects by enclosing purlin, encloses purlin and adopts the C30 concrete.
(6) steel supports construction
Support is connected to the limit, hole encloses purlin, apply prestressing force and fix.That supports sets up in proper order, must be undertaken by the principle of constructing earlier in the big position of foundation pit deformation, reduces foundation pit deformation to greatest extent.
Shoveling, support strictness are firmly accomplished to support afterwards earlier by the construction working condition requirement and are dug.Set up simultaneously at every support two ends, and two ends apply prestressing force simultaneously, finish simultaneously in 24h.
Steel support prestressing force applies accomplishes the segmentation loading, and holding the lotus time is 2min.Apply by stress value and two control indexes prestressing force of the outside shift value of enclosure wall.
When the steel support distances was longer than 20m, prestressing force applied end and adopts Eight characters support adjustable type device in addition.
Cement retaining wall thickness is pressed following formula and is determined among the present invention:
E in the formula
sBe Y type preformed pile modulus of elasticity; I
sBe Y type preformed pile moment of inertia; E
cBe modulus of elasticity of concrete, H is the vertical segment length of Y type preformed pile; R is a cement retaining wall thickness.
The present invention has characteristics such as dash, retaining soil, technology are simple, easy to operate, is applicable to all kinds of soil layers, and short construction period, impervious ability are stronger, reduce construction costs.With cost on the single cement mixing pile water-stop curtain+reinforced concrete bored pile of the same type fender body unit linear meter relatively, the present invention can save cost 20%, has obtained good economic benefit.
Description of drawings
Fig. 1 technological process
Fig. 2 foundation ditch floor map
The multiple paddling process of Fig. 3 compartment
The multiple paddling process of Fig. 4 continous way
1, the cement wall of pile inserted with Y type precast, 2, steel pipe supports, 3, Eight characters support, 4, the adjustable type prestressing apparatus
The specific embodiment
Project profile
Bright rich mansion foundation ditch is rectangle, and floor space is about 1.14 ten thousand m
2Form by 13 layers of main building and podium.The long 68m of foundation ditch, wide 23m go along with sb. to guard him total length and are about 182m, and foundation depth is 7m, and retaining wall adopts pile inserted with Y type precast in the cement mixing pile.The support system of bracing of foundation pit adopts the twice steel to support, and the supporting plane arrangement form is the form of well word to support, and the strength grade of coagulation fortifield village purlin is C30.
Geological condition
The soil layer mechanics index of physics is as shown in table 1.
Table 1 soil layer mechanics index of physics
| Soil layer | The soil layer title | Bed thickness/m | Natural aqueous rate | Severe | Modulus of compressibility E s1-2/MPa | Bearing capacity of foundation slab/kPa | All side friction/the kPa of stake | End resistance/kPa |
| ??1 | Clay | ??2.3 | ??45.6 | ??18.05 | ??3.12 | ??60 | ??11 | |
| ??2 | Sandy silt | ??6.8 | ??39.8 | ??18.63 | ??5.23 | ??130 | ??16 | |
| ??3 | Mud | ??15.2 | ??72.3 | ??16.45 | ??1.62 | ??45 | ??6 | |
| ??4 | Mud matter clay | ??3.6 | ??52.5 | ??18.05 | ??3.01 | ??70 | ??10 | |
| ??5 | Clay | ??5.2 | ??42.8 | ??18.11 | ??3.26 | ??110 | ??14 | ??600 |
| ??6 | Silty clay | ??14.6 | ??30.6 | ??18.92 | ??18.28 | ??210 | ??21 | ??1100 |
Y type preformed pile is to grow up according to the principle that the uniform section periphery enlarges.As everyone knows, the long-pending peripheral ratio of circular uniform section with square, equilateral triangle is 1: 1.13: 1.30, can reach 1: 1.60 and compare with Y shape.Zhou Bianchang increases, and the respective side power of rubbing increases, uniform section, etc. the long Y shape stake of stake and square stake, circle compare and to combine better with outside cement mixing pile.
Steel supports and adopts the form of support in conjunction with angle brace, arranges to have following advantage like this: 1. stressed clear and definite to strut member, be easy to control foundation pit deformation; 2. bigger by the shoveling space in the foundation ditch, excavation and construction is convenient.
Construction sequence comprises:
(1) excavation groove
According to bracing of foundation pit inner control line, to remove underground obstacle and excavate groove, gash depth is 0.5～0.7m, width is 1～1.2m.
(2) cement mixing pile is in place
Agitation pile pile frame perpendicularity deviation is not more than 1%.Welding one radius is the iron ring of 5cm on pile frame, and the 10m eminence hangs a plummet, utilizes transit alignment drilling rod verticality, makes plummet just in time by the iron ring center.Must suitably regulate drilling rod before each construction, make plummet be positioned at iron ring, promptly the drilling rod error of perpendicularity is controlled in 0.5%.
(3) cement mixing pile construction
Reinforced cement retaining wall thickness determines that by formula 1 thickness is 0.9m, and distance of shaft centers is 600mm, agitation pile overlap joint 250mm.The mixer hoisting velocity is 0.8m/min, and spray pump pressure is controlled at 0.4～0.6MPa, prevents sandwich of layers or disconnected slurry situation.
Sandy silt layer soil property is difficult for stirring, and repeatedly stirs again in the soil layer that is difficult for stirring, and is pressed into the expansive soil slurries of configuration by a certain percentage earlier, sprays into cement paste again.The advantage of this kind method is that the cost input is less, but the proportioning of slurries needs be adjusted by actual soil layer situation.Potter's clay powder and water weight ratio are 0.08～0.1, and slurries should be placed 24h after mixing system, make its physical property more stable.
According to geological condition, adopt the multiple paddling process of compartment, as shown in Figure 3.
Adjacent cement mixing pile lapping time should as surpassing 24h, then not increase grouting amount 20% greater than 24h when second cement mixing pile construction, hoisting velocity simultaneously slows down.
When finding abnormal conditions such as the cement mixing pile whitewashing is undesired in the work progress, can be in the peripheral piling of unusual cement mixing pile, overlap joint thickness is greater than 10cm.
(4) Y type preformed pile inserts
For guaranteeing that Y type preformed pile inserts agitation pile between two parties with vertical, on groove, should place Y type preformed pile locating rack earlier, locating rack is made, is placed and fix by on-the-spot relevant size with Y type preformed pile.Behind the loop wheel machine lifting Y type preformed pile, use transit and adjust its verticality, then vertical Y type preformed pile bottom centre is aligned insertion, insert slowly in the agitation pile,, directly put to the design elevation position when putting soon after 1/3 in the insertion agitation pile along locating rack; Put in place as not transferring, can Y type preformed pile be delivered to the position by excavator or vibrator, must guarantee that Y type preformed pile is vertical between two parties this moment, utilizes the top absolute altitude of level gauge control Y type preformed pile; Should adjust the horizontal error and the vertical error of Y type preformed pile in the Y type preformed pile insertion process at any time.The Y type construction of prefabricated piles that inserts in the agitation pile must be finished in the 4h behind the agitation pile pile.
(5) enclosing purlin makes
As the supporting and protection structure of retaining soil, the cement mixing pile of pile inserted with Y type precast connects by enclosing purlin, encloses purlin and adopts the C30 concrete, and width is 700mm, highly is 700mm.
(6) steel supports construction
Support is switched to the limit, hole encloses purlin, apply prestressing force and fix.That supports sets up in proper order, must be undertaken by the principle of constructing earlier in the big position of foundation pit deformation, reduces foundation pit deformation to greatest extent.
Shoveling, support strictness are firmly accomplished to support afterwards earlier by the construction working condition requirement and are dug.Set up simultaneously at every support two ends, and two ends apply prestressing force simultaneously, supports construction and finishes simultaneously in 24h.
Steel support prestressing force applies strictness to carry out on request, and accomplishes the segmentation loading, and holding the lotus time is 2min.Support shared 2 oil pumps in two ends, 4 jack, by special messenger's unified command, synchronous coordination, and be that the outside shift value of stress value and enclosure wall is controlled with two controls.
This engineering support prestressing force applies at twice and puts in place.After reaching design prestressing value, along with going deep into of shoveling face, monitored data and axle power counting certificate according to the foundation ditch periphery determine whether to be added with stress, reach alarming value as monitored data, then need be added with stress, make bearing stress all the time under slave mode.The design prestressing force that supports is 800kN, loads at twice.Except that angle brace, support is two ends and applies prestressing force simultaneously.
Because this engineering steel support distances is long, for remedy may since the support system folk prescription to the long loss of prestress that causes, prestressing force applies end and adopts Eight characters support adjustable type prestressing apparatus in addition.
Claims (8)
1. the cement mixing pile pattern foundation pit supporting structure and the job practices of pile inserted with Y type precast, its feature comprises following construction sequence:
(1) excavation groove
According to bracing of foundation pit inner edge control line, remove underground obstacle and excavate groove.
(2) cement mixing pile is in place
Agitation pile pile frame perpendicularity deviation is not more than 1%.Welding one radius is the iron ring of 5cm on pile frame, and the 10m eminence hangs a plummet, utilizes transit alignment drilling rod verticality, makes plummet just in time by the iron ring center.Must suitably regulate drilling rod before each construction, make plummet be positioned at iron ring, promptly the drilling rod error of perpendicularity is controlled in 0.5%.
(3) cement mixing pile construction
The mixer hoisting velocity is 0.8～1m/min, and spray pump pressure is controlled at 0.4～0.6MPa.When finding abnormal conditions such as the cement mixing pile whitewashing is undesired in the work progress, can be in the peripheral piling of unusual cement mixing pile, overlap joint thickness is greater than 10cm.
(4) Y type preformed pile inserts
Y type preformed pile locator card is set on groove fixes, insert in the cement mixing method, the verticality of using transit or plumb bob control Y type preformed pile to insert with Y type preformed pile bottom centre center, align piles position and along locator card is vertical slowly.
(5) enclosing purlin makes
The cement mixing pile of pile inserted with Y type precast connects by enclosing purlin, encloses purlin and adopts the C30 concrete.
(6) steel supports construction
Support is connected to the limit, hole encloses purlin, apply prestressing force and fix.That supports sets up in proper order, must be undertaken by the principle of constructing earlier in the big position of foundation pit deformation, reduces foundation pit deformation to greatest extent.Shoveling, support strictness are accomplished to support afterwards earlier by the construction working condition requirement and are dug.Set up simultaneously at every support two ends, and two ends apply prestressing force simultaneously, finish simultaneously in 24h.
2. according to the cement mixing pile pattern foundation pit supporting structure and the job practices of the described pile inserted with Y type precast of claim 1, it is characterized in that cement retaining wall thickness is definite by following formula:
E in the formula
sBe Y type preformed pile modulus of elasticity; I
sBe Y type preformed pile moment of inertia; E
cBe modulus of elasticity of concrete, H is the vertical segment length of Y type preformed pile; R is a cement retaining wall thickness.
3. according to the cement mixing pile pattern foundation pit supporting structure and the job practices of claim 1 or the described pile inserted with Y type precast of claim 2, it is characterized in that in the construction of step (3) cement mixing pile, for sandy silt layer soil property, be pressed into the expansive soil slurries of configuration by a certain percentage earlier, spray into cement paste again.
4. according to the cement mixing pile pattern foundation pit supporting structure and the job practices of claim 1 or the described pile inserted with Y type precast of claim 2, it is characterized in that in the construction of step (3) cement mixing pile, less than 50 soil layer, adopt the multiple paddling process of compartment for the mark value of passing through; For being used to mark the soil layer of the value of passing through, adopt the multiple paddling process of continous way greater than 50.
5. according to the cement mixing pile pattern foundation pit supporting structure and the job practices of claim 1 or the described pile inserted with Y type precast of claim 2, it is characterized in that in the construction of step (3) cement mixing pile, adjacent cement mixing pile lapping time should be greater than 24h, as surpassing 24h, then increase grouting amount 20% when second cement mixing pile construction, hoisting velocity simultaneously slows down.
6. according to the cement mixing pile pattern foundation pit supporting structure and the job practices of the described pile inserted with Y type precast of claim 3, it is characterized in that step (4) Y type preformed pile inserts in the construction, the Y type preformed pile insertion construction of inserting in the agitation pile must be finished in the 4h behind the agitation pile pile.
7. according to the cement mixing pile pattern foundation pit supporting structure and the job practices of claim 1 or the described pile inserted with Y type precast of claim 2, it is characterized in that step (6) steel supports in the construction, steel support prestressing force applies accomplishes the segmentation loading, and holding the lotus time is 2min.Apply by stress value and two control indexes prestressing force of the outside shift value of enclosure wall.
8. according to the cement mixing pile pattern foundation pit supporting structure and the job practices of the described pile inserted with Y type precast of claim 3, it is characterized in that step (6) steel supports in the construction, when the steel support distances was longer than 20m, prestressing force applied the adjustable type device beyond the support of the end employing Eight characters.
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| Application Number | Priority Date | Filing Date | Title |
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| CN2009101732222A CN101871214B (en) | 2009-09-11 | 2009-09-11 | Foundation pit support and construction method for cement mixing pile inserted with Y type precast pile |
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| CN2009101732222A CN101871214B (en) | 2009-09-11 | 2009-09-11 | Foundation pit support and construction method for cement mixing pile inserted with Y type precast pile |
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| CN101871214A true CN101871214A (en) | 2010-10-27 |
| CN101871214B CN101871214B (en) | 2012-01-04 |
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Cited By (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103290850A (en) * | 2013-06-20 | 2013-09-11 | 江苏城市职业学院 | Arch combination foundation pit retaining and protection system and construction method thereof |
| CN103510509A (en) * | 2013-07-02 | 2014-01-15 | 镇江市城乡建设基础工程有限公司 | Mud counterfort construction method used during pore forming in weathered rock formation with bored pile |
| CN103603347A (en) * | 2013-10-31 | 2014-02-26 | 周兆弟 | Anti-soil-accumulation cement mixing precast pile foundation and forming method |
| CN105672329A (en) * | 2016-02-29 | 2016-06-15 | 济南轨道交通集团有限公司 | Deep foundation pit large-size prefabricated envelop enclosure and construction method |
| CN106522240A (en) * | 2016-11-11 | 2017-03-22 | 上海市机械施工集团有限公司 | Construction method for synchronously applying prestress to two-way steel supports |
| CN106522238A (en) * | 2016-11-11 | 2017-03-22 | 上海市机械施工集团有限公司 | Axial loading method for steel supports |
| CN107604898A (en) * | 2017-10-07 | 2018-01-19 | 吕琳 | Piling wall is gone along with sb. to guard him in a kind of novel block isolation |
| CN108589705A (en) * | 2018-04-25 | 2018-09-28 | 李相峰 | Casing cast-in-place concrete pile |
| CN108894211A (en) * | 2018-06-15 | 2018-11-27 | 徐秉凯 | A kind of wall scheme processed of Y-piece mould |
| CN109706940A (en) * | 2019-02-27 | 2019-05-03 | 腾达建设集团股份有限公司 | Foundation pit servo support system setting method |
| CN110847164A (en) * | 2019-11-19 | 2020-02-28 | 上海市基础工程集团有限公司 | Construction method of rapid envelope structure of double-wheel milling deep mixing pile with inserted prefabricated part |
| CN112282767A (en) * | 2020-10-21 | 2021-01-29 | 江苏旭辰交通科技发展有限公司 | Ultra-deep reinforcement construction method for shield end soil body under water-rich silty-fine sand geology |
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2009
- 2009-09-11 CN CN2009101732222A patent/CN101871214B/en not_active Expired - Fee Related
Cited By (14)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103290850A (en) * | 2013-06-20 | 2013-09-11 | 江苏城市职业学院 | Arch combination foundation pit retaining and protection system and construction method thereof |
| CN103510509A (en) * | 2013-07-02 | 2014-01-15 | 镇江市城乡建设基础工程有限公司 | Mud counterfort construction method used during pore forming in weathered rock formation with bored pile |
| CN103603347A (en) * | 2013-10-31 | 2014-02-26 | 周兆弟 | Anti-soil-accumulation cement mixing precast pile foundation and forming method |
| CN105672329B (en) * | 2016-02-29 | 2017-12-15 | 济南轨道交通集团有限公司 | The large size prefabricated building enclosure of deep basal pit and construction method |
| CN105672329A (en) * | 2016-02-29 | 2016-06-15 | 济南轨道交通集团有限公司 | Deep foundation pit large-size prefabricated envelop enclosure and construction method |
| CN106522240A (en) * | 2016-11-11 | 2017-03-22 | 上海市机械施工集团有限公司 | Construction method for synchronously applying prestress to two-way steel supports |
| CN106522238A (en) * | 2016-11-11 | 2017-03-22 | 上海市机械施工集团有限公司 | Axial loading method for steel supports |
| CN106522240B (en) * | 2016-11-11 | 2019-03-12 | 上海市机械施工集团有限公司 | A kind of two-way bracing members are synchronous to apply prestressed construction method |
| CN107604898A (en) * | 2017-10-07 | 2018-01-19 | 吕琳 | Piling wall is gone along with sb. to guard him in a kind of novel block isolation |
| CN108589705A (en) * | 2018-04-25 | 2018-09-28 | 李相峰 | Casing cast-in-place concrete pile |
| CN108894211A (en) * | 2018-06-15 | 2018-11-27 | 徐秉凯 | A kind of wall scheme processed of Y-piece mould |
| CN109706940A (en) * | 2019-02-27 | 2019-05-03 | 腾达建设集团股份有限公司 | Foundation pit servo support system setting method |
| CN110847164A (en) * | 2019-11-19 | 2020-02-28 | 上海市基础工程集团有限公司 | Construction method of rapid envelope structure of double-wheel milling deep mixing pile with inserted prefabricated part |
| CN112282767A (en) * | 2020-10-21 | 2021-01-29 | 江苏旭辰交通科技发展有限公司 | Ultra-deep reinforcement construction method for shield end soil body under water-rich silty-fine sand geology |
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|---|---|
| CN101871214B (en) | 2012-01-04 |
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