CN103774639A - Preloading system and construction method - Google Patents

Preloading system and construction method Download PDF

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Publication number
CN103774639A
CN103774639A CN201410040463.0A CN201410040463A CN103774639A CN 103774639 A CN103774639 A CN 103774639A CN 201410040463 A CN201410040463 A CN 201410040463A CN 103774639 A CN103774639 A CN 103774639A
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CN
China
Prior art keywords
sand cushion
band drain
construction
piling prepressing
paves
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN201410040463.0A
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Chinese (zh)
Inventor
刘强军
徐冬青
杨有金
徐高山
庞前凤
刘自明
林属洋
徐小燕
苑宏伟
刘海龙
吕瑞峰
张蒙
龙浪波
陈孝义
罗钦文
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
First Engineering Co Ltd of China Railway 22nd Bureau Group Co Ltd
China Railway 22nd Bureau Group Co Ltd
Original Assignee
First Engineering Co Ltd of China Railway 22nd Bureau Group Co Ltd
China Railway 22nd Bureau Group Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by First Engineering Co Ltd of China Railway 22nd Bureau Group Co Ltd, China Railway 22nd Bureau Group Co Ltd filed Critical First Engineering Co Ltd of China Railway 22nd Bureau Group Co Ltd
Priority to CN201410040463.0A priority Critical patent/CN103774639A/en
Publication of CN103774639A publication Critical patent/CN103774639A/en
Pending legal-status Critical Current

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Abstract

The invention discloses a preloading system and a construction method, relates to the technical field of constructional engineering, and aims to provide the preloading system which is simple in technology, good in reinforcement effect and low in manufacturing cost and the construction method. The system comprises drain boards (1) under the earth surface, sand cushion layers (2) on the earth surface and a stone layer on the sand cushion layers, wherein the layout of the drain boards (1) is quincuncial; and an interval between adjacent drain boards ranges from 1.1 m to 1.5 m. The construction method of the preloading system comprises the steps as follows: cleaning a working surface; laying a first sand cushion layer; positioning the drain boards; leading holes by a hole leading machine; moving the machine in place and inserting the drain boards; processing pile heads of the drain boards; laying geogrids; laying a second sand cushion layer; embedding a settlement observation tube and a water collecting well; and preloading. The system is simple in structure and low in manufacturing cost, and perpendicular insertion and quincuncial design are adopted for layout of the drain boards, so that the drainage effect is better; and loading by stages ca be performed on a loading field, and a loading material is sufficiently utilized.

Description

A kind of piling prepressing system and construction method
Technical field
The present invention relates to construction engineering technical field, particularly a kind of piling prepressing system and construction method.
Background technology
Preloading is one of common method of processing the weak viscous soil horizon that thickness is larger, the method is before building, by applying certain prefabricating load, make ground stabilization by consolidation gradually in the situation that of prefabricating load, thereby reduce subsequent sedimentation and settlement after construction, improve the supporting capacity of foundation soil.Preloading, with earth material, sandstone, sand material or building itself, if embankment, dam body, house etc. are as load, carries out precompressed to the ground being reinforced.Soft foundation, under this imposed load effect, produces positive excess hydrostatic pressure.Through after a period of time, excess hydrostatic pressure dribbles, and in soil, effective stress constantly increases, and foundation soil is able to fixed, produces vertical deformation, and intensity is also improved simultaneously.
The patent No. is that 200910049878 patent application document discloses a kind of " the preloading safe construction method using on strong constitutive property weak soil ", this invention comprises the steps: the first step, in earlier stage geological survey, divide soil layer, find out position, groundwater type and the water recharging situation of pervious layer, and determine Soil Parameters by soil test, make soil test achievement summary table; Second step, the plastic draining board in early stage and the construction of sand cushion; The 3rd step, geological exploration in mid-term, determines the level of disruption of Plastic Drain Slab Construction to the bottom soil body in earlier stage; The 4th step, determines construction parameter, increases the scheduling of determining later stage embankment preloading with the relation of the degree of consolidation according to soil strength; The 5th step, carries out embankment preloading construction according to constructure scheme definite in the 4th step, and last road surface pavement, completes the construction of whole embankment.But, this preloading complex process, cost is high, and consolidation effect is poor, and preloading materials utilization rate is low, and construction cost is higher.
Summary of the invention
In order to overcome above-mentioned defect, the technical problem to be solved in the present invention is: provide that a kind of construction technology is simple, consolidation effect good, construction costs is low, lower piling prepressing system and the construction method of construction cost.
The present invention is that the technical scheme that solves the problems of the technologies described above employing is: a kind of piling prepressing system, comprises the band drain below earth's surface, the block stone layer on sand cushion and the sand cushion on earth's surface; Described band drain vertical distribution, layout is quincunx.
A kind of piling prepressing construction method comprises the steps: place cleaning; First floor sand cushion paves; Band drain location; Draw power traction hole, hole; The telephone-moving band drain that plugs in place; The processing of band drain pile crown; Lay geo-grid; Second layer sand cushion paves; Bury settlement observation pipe and collecting well underground; Piling prepressing.The described band drain that plugs, spacing of prefabricated drain is 1.1-1.5m, is arranged as quincunx.
A kind of piling prepressing construction method, also specifically comprises the steps:
(1) place cleaning: construction plant is cleared up, flattened;
(2) the first floor sand cushion that paves: sand cushion paves on earth's surface;
(3) band drain location: band drain vertically plugs, and spacing is 1.1-1.5m, is arranged as quincunx;
(4) draw power traction hole, hole: top layer rock-fill is drawn to hole;
(5) the telephone-moving band drain that plugs in place: band drain embedded depth is for penetrating mud;
(6) band drain pile crown processing: after drainage plate striking, should cut off unnecessary part;
(7) lay geo-grid: lay unidirectional geo-grid, described geo-grid fabric width >=3m.
(8) second layer sand cushion that paves: after geo-grid is laid, sand cushion paves;
(9) bury settlement observation pipe and collecting well underground;
(10) piling prepressing: after sand cushion paves, placement in layers roadbed, and grinding compacting, fill precompressed after roadbed basis is body formed.
Described draw hole machine draw hole perpendicularity≤1.5%.
The standard that unnecessary part is cut off in the processing of described band drain pile crown is protruded length >=20cm more than sand cushion, and itself and sand cushion are connected, and guarantees that draining is smooth and easy.
The quantity of the described settlement observation pipe of burying underground is every 100 meters >=3 points.
Described collecting well installation site is in roadbed midline, and collecting well elevation of bottom is lower than original ground 0.5-1m, and with sand cushion leveling, collecting well evenly punches lower than original ground part hoop, guarantees that current are unobstructed.
The invention has the beneficial effects as follows:
1, piling prepressing system architecture of the present invention is simple, and cost is low, aspect band drain laying, adopted vertically plug, quincunx design, like this design effect be that drainage effect is better.
2, piling prepressing construction method of the present invention, in the situation that the duration allows, can carry out preloading by stages to preloading place, to make full use of preloading materials, reduces costs.In the situation that the district of rockfilling cannot adopt vacuum preloading, use this construction method, speed of application is fast, and little on the follow-up Foundation Treatment impact of carrying out, cost is low, consolidation effect good.
Accompanying drawing explanation
Illustrate a kind of piling prepressing system of the present invention below in conjunction with accompanying drawing.
Fig. 1 is a kind of structural representation of piling prepressing system;
Fig. 2 is band drain layout structure schematic diagram.
In figure: 1, band drain, 2, sand cushion, 3, block stone layer.
The specific embodiment
As shown in Figure 1-2, a kind of piling prepressing system, comprises the band drain below earth's surface, the block stone layer on sand cushion and the sand cushion on earth's surface.Feature: described band drain vertical distribution, vertical missing≤1.5%, plate spacing is 1.1-1.5m, layout is quincunx.Described sand cushion is 30-40cm, and placing sand layer is medium coarse sand, mud content≤3%.
A kind of piling prepressing construction method comprises the steps: place cleaning, the first floor sand cushion that paves, band drain location, draw that power traction hole, hole, telephone-moving in placely plug band drain, the processing of band drain pile crown, lay geo-grid, the second layer sand cushion that paves, bury settlement observation pipe and collecting well, piling prepressing underground.Steps characteristic: described in plug band drain, band drain vertically plugs, vertical missing≤1.5%, plate spacing is 1.1-1.5m, is arranged as quincunx.
A kind of piling prepressing construction method, also specifically comprises the steps:
(1) place cleaning: construction plant is cleared up, flattened;
(2) the first floor sand cushion that paves: 30-40cm sand cushion paves on earth's surface;
(3) band drain location: band drain vertically plugs, vertical missing≤1.5%, plate spacing is 1.1-1.5m, is arranged as quincunx;
(4) draw power traction hole, hole: top layer rock-fill is drawn to hole;
(5) the telephone-moving band drain that plugs in place: band drain embedded depth is for penetrating mud;
(6) band drain pile crown processing: after drainage plate striking, should cut off unnecessary part;
(7) lay geo-grid: lay unidirectional geo-grid;
(8) second layer sand cushion that paves: after geo-grid is laid, 30-40cm sand cushion paves;
(9) bury settlement observation pipe and collecting well underground;
(10) piling prepressing: after sand cushion paves, placement in layers roadbed, and grinding compacting, fill precompressed after roadbed basis is body formed.
Described draw hole machine draw hole perpendicularity≤1.5%.
The standard that unnecessary part is cut off in the processing of described band drain pile crown is protruded length >=20cm more than sand cushion, and itself and sand cushion are connected, and guarantees that draining is smooth and easy.
Described geo-grid fabric width >=3m.
The quantity of the described settlement observation pipe of burying underground is every 100 meters >=3 points.
Described collecting well installation site is in roadbed midline, and collecting well elevation of bottom is lower than original ground 0.5-1m, and with sand cushion leveling, collecting well evenly punches lower than original ground part hoop, guarantees that current are unobstructed.
Should be understood that, the above-mentioned specific embodiment of the present invention is only for exemplary illustration or explain principle of the present invention, and do not form the restriction to invention.Therefore any modification of, making, be equal to replacement, improvement etc., within protection scope of the present invention all should be included in without departing from the spirit and scope of the present invention in the situation that.In addition, claims of the present invention are intended to contain whole variations and the modification in the equivalents that falls into claims scope and border or this scope and border.

Claims (9)

1. a piling prepressing system, comprises the band drain (1) below earth's surface, and the block stone layer (3) on sand cushion (2) and the sand cushion on earth's surface, is characterized in that: described band drain (1) layout is quincunx.
2. a kind of piling prepressing system according to claim 1, is characterized in that: described band drain (1) spacing is 1.1-1.5m.
3. according to the piling prepressing construction method one of claim 1-2 Suo Shu, comprise the steps: place cleaning; First floor sand cushion paves; Band drain location; Draw hole; The telephone-moving band drain that plugs in place; The processing of band drain pile crown; Lay geo-grid; Second layer sand cushion paves; Bury settlement observation pipe and collecting well underground; Piling prepressing; Described spacing of prefabricated drain is 1.1-1.5m, is arranged as quincunx.
4. piling prepressing construction method according to claim 3, also comprises the steps:
(1) place cleaning: construction plant is cleared up, flattened;
(2) the first floor sand cushion that paves: 30-40cm sand cushion paves on earth's surface;
(3) band drain location: band drain vertically plugs, and spacing is 1.1-1.5m, is arranged as quincunx;
(4) draw hole: top layer rock-fill is drawn to hole;
(5) the telephone-moving band drain that plugs in place: band drain embedded depth is for penetrating mud;
(6) band drain pile crown processing: after drainage plate striking, should cut off unnecessary part;
(7) lay geo-grid: lay unidirectional geo-grid, geo-grid fabric width >=3m;
(8) second layer sand cushion that paves: after geo-grid is laid, 30-40cm sand cushion paves;
(9) bury settlement observation pipe and collecting well underground;
(10) piling prepressing: after sand cushion paves, placement in layers roadbed, and grinding compacting, fill precompressed after roadbed basis is body formed.
5. piling prepressing construction method according to claim 4, described in draw hole machine draw hole perpendicularity≤1.5%.
6. piling prepressing construction method according to claim 4, the standard that unnecessary part is cut off in the processing of described band drain pile crown is protruded length >=20cm more than sand cushion.
7. piling prepressing construction method according to claim 4, described in the quantity of the settlement observation pipe buried underground be every 100 meters >=3 points.
8. piling prepressing construction method according to claim 3, described collecting well installation site is in roadbed midline, and collecting well elevation of bottom is lower than original ground 0.5-1m.
9. piling prepressing construction method according to claim 3, described collecting well is installed bottom leveling, and punches lower than original ground part hoop at collecting well.
CN201410040463.0A 2014-01-27 2014-01-27 Preloading system and construction method Pending CN103774639A (en)

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Application Number Priority Date Filing Date Title
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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106049412A (en) * 2016-07-02 2016-10-26 天鸿建设集团有限公司 Construction method of heaping pre-compression soft foundation reinforcement
CN107542081A (en) * 2017-08-29 2018-01-05 中冶集团武汉勘察研究院有限公司 The installation method of a kind of deep yard drain plate that rockfills and for the hole-forming device in this method
CN109778833A (en) * 2019-03-13 2019-05-21 秦山伟业建设集团有限公司 A kind of seabeach of enclosing of jackstone in conjunction with flexiplast drain bar applies roadbed construction method

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005207164A (en) * 2004-01-26 2005-08-04 Maruyama Kogyo Kk Soil improvement method for weak ground, and filled structure prepared by using the method
CN101021068A (en) * 2007-03-09 2007-08-22 包国建 Low-level prepressing drainage dynamic consolidating soft soil foundation processing method
CN102296591A (en) * 2011-07-14 2011-12-28 福建省永固基强夯工程有限公司 Rapid drainage solidifying treatment method of soft soil foundation
CN202718084U (en) * 2012-08-23 2013-02-06 越烽建设集团有限公司 Composite foundation with flexible piles and drain boards combined
CN203346865U (en) * 2013-05-30 2013-12-18 高远 Soft soil foundation preloading processing structure

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2005207164A (en) * 2004-01-26 2005-08-04 Maruyama Kogyo Kk Soil improvement method for weak ground, and filled structure prepared by using the method
CN101021068A (en) * 2007-03-09 2007-08-22 包国建 Low-level prepressing drainage dynamic consolidating soft soil foundation processing method
CN102296591A (en) * 2011-07-14 2011-12-28 福建省永固基强夯工程有限公司 Rapid drainage solidifying treatment method of soft soil foundation
CN202718084U (en) * 2012-08-23 2013-02-06 越烽建设集团有限公司 Composite foundation with flexible piles and drain boards combined
CN203346865U (en) * 2013-05-30 2013-12-18 高远 Soft soil foundation preloading processing structure

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
杨海杰等: "长和公路塑料排水板处理软土地基施工技术应用", 《浙江省公路学会2005年论文集》 *

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN106049412A (en) * 2016-07-02 2016-10-26 天鸿建设集团有限公司 Construction method of heaping pre-compression soft foundation reinforcement
CN106049412B (en) * 2016-07-02 2018-06-22 天鸿建设集团有限公司 A kind of construction method of piling prepressing reinforcing soft foundation
CN107542081A (en) * 2017-08-29 2018-01-05 中冶集团武汉勘察研究院有限公司 The installation method of a kind of deep yard drain plate that rockfills and for the hole-forming device in this method
CN107542081B (en) * 2017-08-29 2020-01-31 中冶集团武汉勘察研究院有限公司 method for installing drainage plate of deep stone-filling site and hole-forming device used in the method
CN109778833A (en) * 2019-03-13 2019-05-21 秦山伟业建设集团有限公司 A kind of seabeach of enclosing of jackstone in conjunction with flexiplast drain bar applies roadbed construction method

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Application publication date: 20140507