CN103556645B - Method for forming grouting space in sand gravel layer - Google Patents
Method for forming grouting space in sand gravel layer Download PDFInfo
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- CN103556645B CN103556645B CN201310453723.2A CN201310453723A CN103556645B CN 103556645 B CN103556645 B CN 103556645B CN 201310453723 A CN201310453723 A CN 201310453723A CN 103556645 B CN103556645 B CN 103556645B
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Abstract
The invention discloses a method for forming grouting space in a sand gravel layer. The method includes steps of (1) forming a drill hole 3 through a permeable ground layer 7 in a position where a curtain wall is to be formed; (2) placing downwards a steel cage 4 to the position of a pebble layer 6 by means of the above drill hole 3, wherein a longitudinal bar-shaped elongated slot 10 is formed in the steel cage 4; (3) installing a spray head 5 at the bottom end of a drill rod 2, and placing downwards the spray head 5 to the position of the pebble layer, wherein the direction of the spray head is identical to that of the bar-shaped elongated slot 10 formed in the steel cage 4; (4) placing downwards a high pressure air conveying pipe 9 to an outer side of the drill rod 2 until the high pressure air conveying pipe reaches the bottom of the drill layer 3; (5) using the spray head 5 to get through high pressure water flows through the drill rod, and vertically moving the drill rod 2 so that the high pressure water flows cut the pebble layer 6 and muddy sand flows to the bottom of the drill hole; (6) simultaneously using a high pressure conveying pipe 9 to input high pressure air, wherein the high pressure air drives muddy sand slurries to erupt out of the earth surface from the bottom of the drill hole so as to form the presupposed grouting space. According to the method for forming the grouting space in the sand gravel layer, the grouted slurries form the effective underground water plugging continuous curtain in the regulated space.
Description
Technical field
The present invention relates to a kind of grouting for water blocking Treatment process, especially a kind of method forming slip casting space in sand ovum layer.
Background technology
When carrying out water blockoff improvement for thick large Quaternary system side slope at present, the method for slip casting is very conventional.But in slip casting process, the normal predominant pathway diffusion along being randomly formed in the earth formation of slurries is far, waste a large amount of slurries, but effective water block curtain cannot be formed, be cause Grouting engineering " effect is uncontrollable, cost is uncontrollable, duration uncontrollable " key factor (Wang Mengshu. Chinese tunnels and underground engineering builds technology. [M]. Beijing: People's Transportation Press, 2010).
When implementing grouting for water blocking engineering in thick large Quaternary system sandy gravel, due to the anisotropy of earth formation and composition, the splitting slurries filling seam causing high pressure slurries formed in the earth formation, just predominant pathway is being defined nearby apart from boring, and along predominant pathway to external expansion, slurries are also outwards filled thereupon.But this predominant pathway determined by stratigraphic structure and component thereof, its propagation direction is with certain randomness, and be not often target filling direction, the obturation formed also can not form effective water blockoff curtain wall.Meanwhile, due to the formation of predominant pathway, grouting pressure is declined, slurries all significantly decline in the permeability of other direction in space of borehole circumference and stress crack resistance, can not be formed set, the effective pile diameter centered by holing.Moreover, owing to there is no effective instrument and method at present, Real-Time Monitoring and observation are carried out to the flowing of slurries in subsurface formations, can only according to the drilling data on the registration of grouting pressure table and stratum, the personal experience according to operating personnel judges rational grouting amount and the time stopping slip casting.Once predominant pathway is formed in stratum, grouting pressure, in stable or decline state, inject a large amount of slurries and just can reach grouting pressure set by experience (or experiment), or can not reach setting pressure all the time, often cause the waste of great injecting paste material.
Summary of the invention
The technical problem to be solved in the present invention is to provide a kind of method forming slip casting space in sand ovum layer, with in the space for injecting slurries, forming artificial predominant pathway in advance, making its size, controlled shape.
For solving the problems of the technologies described above, the method step that the present invention takes is:
(1) boring is formed, through permeable stratum at the position intending being formed water blockoff underground curtain wall;
(2) utilize above-mentioned boring, under the position of cobble layer, enter steel cage as support, steel cage is provided with longitudinal bar shaped elongated slot;
(3) at the bottom mounting spray head of drilling rod, and under enter cobble layer position; The nozzle direction of shower nozzle is consistent with the bar shaped elongated slot on steel cage;
(4) enter under outside drilling rod and high pressure gas carrier pipe, through foot of hole;
(5) shower nozzle described in connects High-Pressure Water by drilling rod, and moves up and down drilling rod, and High-Pressure Water, by the sand pebble layer of the nozzle disturbance cutting assigned direction of shower nozzle, is flowed to foot of hole under gravity by the silt particle of disturbance;
(6) pressure-air of high pressure gas carrier pipe input simultaneously, pressure-air drives cement mortar ejection earth's surface from foot of hole, thus in sandy gravel, form default slip casting space.
In step of the present invention (2), the diameter of steel cage is between bore diameter and drill pipe diameter.
In step of the present invention (2), bar shaped elongated slot is symmetricly set on the both sides of steel cage, and the direction of bar shaped elongated slot is consistent with the direction forming curtain wall.
The beneficial effect adopting technique scheme to produce is: the present invention utilizes SASA, and blows out the silt particle in sand pebble layer by high pressure gas, thus in sand ovum layer, form default slip casting space; By the present invention, can intend being formed in the stratum of underground curtain, in the space for injecting slurries, form artificial predominant pathway in advance, making its size, controlled shape, thus ensure that the slurries injected form effective underground water plugging continuous curtain in regulation space.
The present invention uses steel cage as support, prevents the collapse hole accident easily formed in boulder bed; Use high-pressure water jet sand pebble layer, formed and preset slip casting space; Use high pressure gas ejection cement mortar, the jet space of High-Pressure Water is expanded.This method can prevent the major accident that can not form effective water blockoff curtain wall during slip casting in thick boulder bed effectively; Particularly formed at ground water field, when groundwater velocity is larger, more effectively.
Accompanying drawing explanation
Below in conjunction with the drawings and specific embodiments, the present invention is further detailed explanation.
Fig. 1 is device structure schematic diagram of the present invention;
Fig. 2 is the structural representation of steel cage in the present invention.
In figure: 1, high-pressure water pipe; 2, drilling rod; 3, hole; 4, steel cage; 5, shower nozzle; 6, cobble layer; 7, permeable stratum; 8, high-pressure pump; 9, high pressure gas carrier pipe; 10, bar shaped elongated slot.
Detailed description of the invention
Shown in Fig. 1, in this formation sand ovum layer, the method in slip casting space adopts following concrete job step:
(1) first form boring 3 at the position intending being formed water blockoff underground curtain wall according to the density designed and aperture, boring 3 arrives cobble layer 6 through permeable stratum 7;
(2) under the position of cobble layer 6, enter steel cage 4, the diameter of steel cage 4, between bore diameter and drill pipe diameter, prevents collapse hole as support; Shown in Fig. 2, steel cage 4 both sides are provided with the bar shaped elongated slot 10 of symmetrical longitudinal direction, and bar shaped elongated slot 10 direction is consistent with the direction forming curtain wall;
(3) at the bottom mounting spray head 5 of drilling rod 2, with entering cobble layer position under rig, the nozzle direction of shower nozzle 5 is consistent with the bar shaped elongated slot 10 on steel cage;
(4) enter high pressure gas carrier pipe 9 under outside drilling rod 2, the bottom of through boring 3, high pressure gas carrier pipe 9 is communicated with high-pressure pump 8;
(5) high-pressure water pipe 1 connected by drilling rod 2, input High-Pressure Water, and High-Pressure Water enters shower nozzle 5 by drilling rod centre bore, and the sand pebble layer of 3 both sides of being holed by the nozzle directive on shower nozzle 5; And slowly move up and down drilling rod 2, current are by the sand pebble layer of the nozzle disturbance cutting assigned direction of shower nozzle 5, flowed to the bottom of boring 3 under gravity by the silt particle of disturbance, the cobble in high pressure nozzle dead ahead is subject to the ratio cutting of water jets under high pressure, can form a cutting groove;
(6) start high-pressure pump 8, pressure-air enters foot of hole by high pressure gas carrier pipe 9 simultaneously, and the underground water blowout also imported by the cement mortar of foot of hole to earth's surface, thus forms default slip casting space in sandy gravel.
Claims (3)
1. form the method in slip casting space in sand ovum layer, it is characterized in that, its method step is:
(1) boring (3) is formed, through permeable stratum (7) at the position intending being formed water blockoff underground curtain wall;
(2) utilize above-mentioned boring (3), under the position of cobble layer (6), enter steel cage (4) as supporting, steel cage (4) is provided with longitudinal bar shaped elongated slot (10);
(3) at the bottom mounting spray head (5) of drilling rod (2), and under enter cobble layer position; The nozzle direction of shower nozzle (5) is consistent with the bar shaped elongated slot (10) on steel cage;
(4) under drilling rod (2) outside, high pressure gas carrier pipe (9) is entered, through boring (3) bottom;
(5) shower nozzle (5) described in connects High-Pressure Water by drilling rod, and moves up and down drilling rod (2), and High-Pressure Water, by the cobble layer (6) of the nozzle disturbance cutting assigned direction of shower nozzle, is flowed to foot of hole under gravity by the silt particle of disturbance;
(6) pressure-air of high pressure gas carrier pipe (9) input simultaneously, pressure-air drives cement mortar ejection earth's surface from foot of hole, thus in sandy gravel, form default slip casting space.
2. a kind of method forming slip casting space in sand ovum layer according to claim 1, it is characterized in that: in described step (2), the diameter of steel cage (4) is between bore diameter and drill pipe diameter.
3. a kind of method forming slip casting space in sand ovum layer according to claim 1 and 2, it is characterized in that: in described step (2), bar shaped elongated slot (10) is symmetricly set on the both sides of steel cage (4), and the direction of bar shaped elongated slot (10) is consistent with the direction forming curtain wall.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310453723.2A CN103556645B (en) | 2013-09-29 | 2013-09-29 | Method for forming grouting space in sand gravel layer |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310453723.2A CN103556645B (en) | 2013-09-29 | 2013-09-29 | Method for forming grouting space in sand gravel layer |
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| Publication Number | Publication Date |
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| CN103556645A CN103556645A (en) | 2014-02-05 |
| CN103556645B true CN103556645B (en) | 2015-06-17 |
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| CN201310453723.2A Expired - Fee Related CN103556645B (en) | 2013-09-29 | 2013-09-29 | Method for forming grouting space in sand gravel layer |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1259606A (en) * | 1999-01-01 | 2000-07-12 | 中国有色第十五冶金建设公司第一工程公司 | Deep base pit sand pebble layer casing pipe hole forming technique |
| EP1099799A2 (en) * | 1999-11-10 | 2001-05-16 | Smet-F & C | Apparatus and method for producing a high pressure grouted foundation pile |
| CN101255698A (en) * | 2008-01-23 | 2008-09-03 | 湖南省建筑工程集团总公司 | Drifting sand layer and gravel stratum water-moving double-liquid high pressure slip-casting water-blocking construction method |
| CN102261079A (en) * | 2011-04-28 | 2011-11-30 | 朱奎 | Construction method for foundation pit waterproof curtain |
| CN102995647A (en) * | 2012-12-15 | 2013-03-27 | 天津大学 | Underground water control method used for grouting and seepage insulation of pile hole |
| CN202954371U (en) * | 2012-12-14 | 2013-05-29 | 上海市建工设计研究院有限公司 | Vertical combined type seepage-proofing waterproof curtain structure |
-
2013
- 2013-09-29 CN CN201310453723.2A patent/CN103556645B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1259606A (en) * | 1999-01-01 | 2000-07-12 | 中国有色第十五冶金建设公司第一工程公司 | Deep base pit sand pebble layer casing pipe hole forming technique |
| EP1099799A2 (en) * | 1999-11-10 | 2001-05-16 | Smet-F & C | Apparatus and method for producing a high pressure grouted foundation pile |
| CN101255698A (en) * | 2008-01-23 | 2008-09-03 | 湖南省建筑工程集团总公司 | Drifting sand layer and gravel stratum water-moving double-liquid high pressure slip-casting water-blocking construction method |
| CN102261079A (en) * | 2011-04-28 | 2011-11-30 | 朱奎 | Construction method for foundation pit waterproof curtain |
| CN202954371U (en) * | 2012-12-14 | 2013-05-29 | 上海市建工设计研究院有限公司 | Vertical combined type seepage-proofing waterproof curtain structure |
| CN102995647A (en) * | 2012-12-15 | 2013-03-27 | 天津大学 | Underground water control method used for grouting and seepage insulation of pile hole |
Non-Patent Citations (2)
| Title |
|---|
| 砂卵石地层钻孔灌注桩基础的施工;肖云辉;《南平师专学报》;20030930(第02期);第62-66页 * |
| 高压喷射灌浆在治理砂卵石层中的应用;肖德斌等;《湖南水利水电》;20030430(第02期);第17-18页 * |
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