CN102817361B - Double bushing top cover for broken rock curtain grouting and construction method of double bushing top cover - Google Patents
Double bushing top cover for broken rock curtain grouting and construction method of double bushing top cover Download PDFInfo
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- CN102817361B CN102817361B CN201210330539.4A CN201210330539A CN102817361B CN 102817361 B CN102817361 B CN 102817361B CN 201210330539 A CN201210330539 A CN 201210330539A CN 102817361 B CN102817361 B CN 102817361B
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Abstract
The invention discloses a double bushing top cover for broken rock curtain grouting and a construction method of the double bushing top cover. The double bushing top cover comprises an outer bushing which is drilled into a strong weathered or weak weathered rock stratum of a broken rock through a drill hole and an inner bushing which is installed in the outer bushing through pressure forced by a pressure mechanism and moves in the outer bushing, wherein the outer bushing and the inner bushing are through tubes which are communicated from the upper end to the lower end, a grouting mixture is filled in the outer bushing, and a hard wood plug is arranged at the lower end of the inner bushing in a blocking way and extrudes the grouting mixture in the outer bushing. According to the double bushing top cover disclosed by the invention, grouting and mud jacking are carried out in a circulating way, work stops when the pressure mechanism reaches a rated pressure, and the pressure mechanism is moved away after the grouting mixture sets, so that the double bushing top cover for curtain grouting is convenient to form. With the adoption of the double bushing top cover, the defects of the traditional process are overcome, a cement dosage is greatly reduced due to non mud leakage during construction so that pollution to a soil layer and a downstream environment is reduced, engineering cost is also lowered, a process is simple, and operability is strong.
Description
Technical field
The invention belongs to WR and hydropower construction technical field, be specifically related to a kind of two sleeve pipe top covers and construction method thereof that is used in fragmented rock body curtain grouting.
Background technology
Curtain grouting is the comparatively general a kind of way that solves batholith antiseepage problem.On the batholith of cranny development, carry out curtain grouting and tend to run into not grouting of jam, the situation around oozing grout and can not cause pressure, cannot adopt jam method to construct, and can only adopt aperture sealing method to construct.And the construction of aperture sealing method must be done the enough high top covers of an intensity, if do not done top cover, along with the increase of the degree of depth, grouting pressure strengthens, thereby destroys completely decomposed layer above by puncturing top cover, and traditional way is to adopt steel bar concrete or high pressure jet grouting body.Steel bar concrete top cover is mainly used in newly-built water-retaining structure thing antiseepage body construction, and in the situation that soil excavation directly discloses to curtain grouting for antiseep body layer, cast-in-situ slabs reinforced concrete is used as top cover; High pressure jet grouting body top cover is mainly used in, under completely decomposed and the comparatively obvious geological condition of severely-weathered layering, at completely decomposed layer, carrying out high pressure jet grouting, utilizes this high pressure jet grouting body as top cover, to carry out next step Curtain Grouting Construction.
But but for fragmented rock body, cannot carry out design and the construction of curtain grouting top cover, be difficult to realize aperture sealing method Curtain Grouting Construction, the general not design and construction of our hydraulic structure is on the poor basis of rock crushing situation, many hydraulic structures, because broken batholith has to revise design, have increased considerably engineering cost.
Summary of the invention
The object of the invention is to for above-mentioned the deficiencies in the prior art, a kind of impermeabilisation power that is used in fragmented rock body curtain grouting is strong and save engineering cost two sleeve pipe top covers and construction method thereof are provided.
Technical scheme of the present invention is achieved in that
A kind of technical scheme:
A kind of two sleeve pipe top covers that are used in fragmented rock body curtain grouting, it comprises by boring and creeps into the outer tube in the severely-weathered or weak weathered stratum of fragmented rock body and impose on by pressure mechanism the inner sleeve that pressure is installed in outer tube and moves in outer tube, outer tube is the siphunculus that upper and lower side is communicated with inner sleeve, grouting mixture is housed in outer tube, the stifled hardwood plug that is provided with in the lower end of inner sleeve, in this hardwood plug extruding outer tube for filling the grouting mixture of rock cranny.
The internal diameter of described outer tube is 79-146mm, and the internal diameter of inner sleeve is 60-127mm, the wall thickness 3-5mm of inner sleeve, and the gap between outer tube internal diameter and the external diameter of inner sleeve is not more than 5mm.
Another kind of technical scheme:
A construction method for two sleeve pipe top covers as described above, it comprises the following steps:
1) preparation of construction: the first geologic prospect to construction area, determine the degree of depth of severely-weathered or weak weathered stratum, then preparation grouting mixture;
2) outer tube is installed: first start boring, this hole depth enters in severely-weathered or weak weathered stratum, then outer tube is sunk down in hole fixing;
3) pre-inserted inner sleeve: first fixing crawler type roof-bolter, then the lower end of inner sleeve is blocked with hardwood plug, by crawler type roof-bolter gripping inner sleeve, it is vertically inserted to outer tube again, guarantee that inner sleeve freely moves up and down in outer tube, finally inner sleeve is taken out from outer tube stand-by;
4) mud jacking: first packer and grout pipe are inserted in outer tube, then with mudjack, by packer and grout pipe, grouting mixture is injected to outer tube and carry out slip casting, then with crawler type roof-bolter, drive inner sleeve and hardwood plug to be inserted into extruding grouting mixture in outer tube again and carry out mud jacking, slip casting and mud jacking loop, when the pressure of crawler type roof-bolter reaches rated pressure, at the bottom of inner sleeve sinks down into hole, crawler type roof-bolter quits work;
5) manufacture two sleeve pipe top covers: wait for that grouting mixture solidified after 24 hours, remove crawler type roof-bolter, formed two sleeve pipe top covers of curtain grouting.
Described 2) degree of depth that the hole in extends in severely-weathered rock stratum is that the degree of depth that 4-6m or hole extend in weak weathered stratum is 2-4m, and the distance at the bottom of the bottom of outer tube to hole is 2m.
Described 1) the grouting mixture in comprises ultra-fine sand mortar, cement and Admixture, and their mass ratio is 1:2:0.06, and Admixture comprises water glass, calcium oxide, water reducing agent.
The internal diameter of described outer tube is 79-146mm, and the internal diameter of inner sleeve is 60-127mm, the wall thickness 3-5mm of inner sleeve, and the gap between outer tube internal diameter and the external diameter of inner sleeve is not more than 5mm.
Described 4) rated pressure of the crawler type roof-bolter in is 4-6mpa, and the bottom that sinks down into the inner sleeve at the bottom of hole surpasses the bottom 50cm of outer tube.
The present invention creeps into the outer tube in the severely-weathered or weak weathered stratum of fragmented rock body and imposes on by pressure mechanism the inner sleeve that pressure is installed in outer tube and moves in outer tube by boring, outer tube is the siphunculus that upper and lower side is communicated with inner sleeve, grouting mixture is housed in outer tube, the stifled hardwood plug that is provided with in lower end of inner sleeve, this hardwood plug is pressed on the grouting mixture in outer tube, repeatedly load this grouting mixture, hardwood plug cycle extrusion, when equal pressure reaches rated pressure, pressure mechanism quits work, after solidifying, grouting mixture removes this pressure mechanism, so just, the two sleeve pipe top covers for curtain grouting have been formed, for follow-up curtain grouting is prepared, the invention solves the difficult problem that cannot carry out the construction of curtain grouting top cover in the severely-weathered and weak weathered stratum that cannot excavate, the present invention is spillage not, a large amount of minimizings cement consumption, thereby reduce the pollution to soil layer and downstream environment, reach the social benefit of energy-conserving and environment-protective, also reduced engineering cost, technique is simple, workable.
Accompanying drawing explanation
Below in conjunction with the embodiment in accompanying drawing, the present invention is described in further detail, but do not form any limitation of the invention.
Fig. 1 is the structural representations of the two sleeve pipe top covers of the present invention under use state.
Fig. 2 carries out the structural representation of mud jacking while being the two sleeve pipe top cover construction of the present invention.
In figure: outer tube 1, inner sleeve 2, hardwood plug 3, packer 4, grout pipe 5, grouting agitator 6, mudjack 7, crawler type roof-bolter 8.
The specific embodiment
As shown in Figure 1, a kind of two sleeve pipe top covers that are used in fragmented rock body curtain grouting of the present invention, it comprises by boring and creeps into outer tube 1 in the severely-weathered or weak weathered stratum of fragmented rock body, by pressure mechanism, imposes on that pressure is installed in outer tube 1 and at inner sleeve 2 and the stifled hardwood plug 3 that is located at inner sleeve 2 lower ends of outer tube 1 interior motion.Outer tube 1 is with inner sleeve 2 siphunculus that upper and lower side is communicated with, and grouting mixture is housed in outer tube 1, the grouting mixture in these hardwood plug 3 extruding outer tubes 1.What the pressure mechanism in the present invention adopted is crawler type roof-bolter 8.
As shown in Fig. 1 or 2, a kind of construction method that is used in two sleeve pipe top covers of fragmented rock body curtain grouting of the present invention, comprises the following steps:
1) preparation of construction: the first geologic prospect to construction area, be familiar with subterranean strata branch situation, determine the degree of depth of severely-weathered or weak weathered stratum, for the length of outer tube 1 and the degree of depth of boring provide foundation, then configure as required grouting mixture, and detect the final setting time of this grouting mixture, grouting mixture in the present invention comprises ultra-fine sand mortar, cement and Admixture, their mass ratio is 1:2:0.06, Admixture comprises water glass, calcium oxide, water reducing agent, can improve like this concrete castability of grouting and add strength mortar moulding after solidifying;
2) outer tube is installed: report analysis rock stratum buried depth is surveyed in base area, first as guide hole, check rock stratum buried depth, in conjunction with actual removal of core, determine drilling depth, then start boring, this hole depth enters in severely-weathered or weak weathered stratum, if the design of cover degree of depth that boring extends to severely-weathered rock stratum in strong-weathered rock is 4-6m, if the design of cover degree of depth that boring extends in weak weathered stratum in weak-weathered rock is 2-4m, the process of boring must be carried out hole deviation measurement, guarantee the verticality in hole, outer tube 1 is sunk down in hole fixing, distance at the bottom of the bottom of outer tube 1 to hole is 2m, the internal diameter of outer tube is 79-146mm,
3) pre-inserted inner sleeve: first fixedly crawler type roof-bolter 8, then the lower end of inner sleeve 2 is blocked with hardwood plug 3, by crawler type roof-bolter 8 gripping inner sleeves, it is vertically inserted to outer tube 1 again, assurance inner sleeve 2 freely moves up and down and carries out stroke test in outer tube 1, finally inner sleeve 2 is taken out stand-by from outer tube 1, the internal diameter of the inner sleeve in the present invention is 60-127mm, the wall thickness 3-5mm of inner sleeve, and the gap between outer tube internal diameter and the external diameter of inner sleeve is not more than 5mm;
3) mud jacking: first packer 4 and grout pipe 5 are inserted in outer tube 1, first to injecting clear water in hole, clean bedrock fracture and the tape loop interior sediment that portals, until backwater is limpid, then with grouting agitator 6 preparation grouting mixtures, recycling mudjack 7 injects outer tube 1 by packer 4 and grout pipe 5 by grouting mixture and carries out slip casting, then with crawler type roof-bolter 8, drive inner sleeve 2 and hardwood plug 3 to be inserted into extruding grouting mixture in outer tube 1 again and carry out mud jacking, slip casting and mud jacking loop, when the pressure of crawler type roof-bolter 8 reaches rated pressure 4-6mpa, inner sleeve 2 sinks down into the bottom 50cm that Di Qieqi bottom, hole surpasses outer tube 1, crawler type roof-bolter 8 quits work,
5) manufacture two sleeve pipe top covers: wait for that grouting mixture solidifies (being that crawler type roof-bolter quit work after 24 hours) after 24 hours and removes crawler type roof-bolter 8, formed two sleeve pipe top covers of curtain grouting.
Construction equipment of the present invention and material:
1) main material table
2) list of main equipment
| Sequence number | Title | Quantity | Remarks |
| 1 | Rig | 1 | Geological drilling rig (XY-1 type) |
| 2 | Inclinometer | 1 | Model (JK09/CJ-12A) |
| 3 | Mortar stirring barrel | 1 | / |
| 4 | Mortar pump | 1 | More than pumping pressure 5mpa |
| 5 | Crawler type roof-bolter | 1 | Model (HB45A) |
Quality control of the present invention:
1. the deviation of bore position and design attitude must not be greater than 10cm.
2. vertical grout hole, the deviate of its hole deviation is not more than the regulation in following table, while finding that hole scattering value surpasses design code, should correct in time or adopt remedial measures.
Boring hole deviation maximum allowable offset value
| Hole depth (m) | 20 | 30 | 40 | 50 | 60 |
| Maximum allowable offset value (m) | 0.25 | 0.50 | 0.80 | 1.15 | 1.50 |
Quality assurance measure
1) before construction, must carry out setting out survey according to design drawing, guarantee that the biased difference in hole is in 10cm.
2) equipment is overhauled, particularly pressure meter is identified, guarantee that construction parameter is accurate, guarantee mud jacking pressure.
3) in boring procedure, carry out deviational survey, while there is deviation, correct in time, guarantee into hole perpendicularity.
4) measured pore-forming hole depth, the required casing length of corresponding calculating.
5), when inner sleeve is compressed into, notice that verticality and inner sleeve are necessary for center position in outer tube, avoid inner sleeve sideslip situation.Pressure maintains static after reaching 5～8mpa, waits 24 hours and treat solidifying rear can decontrol roof-bolter, while sweeping logical inner sleeve, notes borehole perpendicularity, avoids the mortar between internal and external casing to cause crack to destroy, and affects slurry seal effect.
6) after two sleeve pipe top covers form, to carrying out packer permeability test in hole, check effect and the quality of top cover, require setting-out pressure 2～3mpa not occur emitting regimen condition.
7) work progress is carried out construction note, reacts in time the situation in auger pressure pipe process, meets special circumstances and must carry out detailed record, for follow-up construction coaches.
The present invention forms after two sleeve pipe top covers, just can carry out follow-up curtain grouting.The technological principle of the two sleeve pipes of the present invention is that outer tube can separate completely decomposed and severely-weathered rock stratum, for high strength mud jacking is carried passage, in order to avoid high-strength slurries splitting completely decomposed and severely-weathered rock stratum; Inner sleeve is mainly to provide mud jacking transmission of power, and provides jam position for aperture curtain grouting.
The of the present invention pair of sleeve pipe top cover solved broken rock curtain grouting because rock stratum cannot exposure and the difficult problem that cannot carry out cover plate construction, for the covering of completely decomposed layer is thinner and buried depth just differs, the construction of broken rock cover plate provides feasibility, has outstanding social benefit; Under given conditions, the present invention can replace conventional high-tension rotary churning pile or concrete cover plate, and the use amount of cement greatly reduces, and excavation and the backfill amount of the earthwork also greatly reduce, and have reduced engineering cost, remarkable in economical benefits; The construction of two sleeve pipe top covers has reduced cement consumption, has used in a large number fine sand, and process equipment is simple, and a large amount of minimizing of the energy amount of disappearing meets the policy that national energy-saving reduces discharging, and has good environmental benefit.
Claims (7)
1. two sleeve pipe top covers that are used in fragmented rock body curtain grouting, it is characterized in that: comprise by boring and creep into the outer tube in the severely-weathered or weak weathered stratum of fragmented rock body and impose on by pressure mechanism the inner sleeve that pressure is installed in outer tube and moves in outer tube, outer tube is the siphunculus that upper and lower side is communicated with inner sleeve, grouting mixture is housed in outer tube, the stifled hardwood plug that is provided with in the lower end of inner sleeve, in this hardwood plug extruding outer tube for filling the grouting mixture of rock cranny.
2. two sleeve pipe top covers that are used in fragmented rock body curtain grouting according to claim 1, it is characterized in that: the internal diameter of described outer tube is 79-146mm, the internal diameter of inner sleeve is 60-127mm, the wall thickness 3-5mm of inner sleeve, and the gap between outer tube internal diameter and the external diameter of inner sleeve is not more than 5mm.
3. a construction method for as claimed in claim 1 pair of sleeve pipe top cover, is characterized in that: comprise the following steps:
1) preparation of construction: the first geologic prospect to construction area, determine the degree of depth of severely-weathered or weak weathered stratum, then preparation grouting mixture;
2) outer tube is installed: first start boring, this hole depth enters in severely-weathered or weak weathered stratum, then outer tube is sunk down in hole fixing;
3) pre-inserted inner sleeve: first fixing crawler type roof-bolter, then the lower end of inner sleeve is blocked with hardwood plug, by crawler type roof-bolter gripping inner sleeve, it is vertically inserted to outer tube again, guarantee that inner sleeve freely moves up and down in outer tube, finally inner sleeve is taken out from outer tube stand-by;
4) mud jacking: first packer and grout pipe are inserted in outer tube, then with mudjack, by packer and grout pipe, grouting mixture is injected to outer tube and carry out slip casting, then with crawler type roof-bolter, drive inner sleeve and hardwood plug to be inserted into extruding grouting mixture in outer tube again and carry out mud jacking, slip casting and mud jacking loop, when the pressure of crawler type roof-bolter reaches rated pressure, at the bottom of inner sleeve sinks down into hole, crawler type roof-bolter quits work;
5) manufacture two sleeve pipe top covers: wait for that grouting mixture solidified after 24 hours, remove crawler type roof-bolter, formed two sleeve pipe top covers of curtain grouting.
4. the construction method of according to claim 3 pair of sleeve pipe top cover, it is characterized in that: the degree of depth that the hole described 2) extends in severely-weathered rock stratum is that the degree of depth that 4-6m or hole extend in weak weathered stratum is 2-4m, and the distance at the bottom of the bottom of outer tube to hole is 2m.
5. the construction method of according to claim 3 pair of sleeve pipe top cover, it is characterized in that: the grouting mixture described 1) comprises ultra-fine sand mortar, cement and Admixture, their mass ratio is 1:2:0.06, and Admixture comprises water glass, calcium oxide, water reducing agent.
6. the construction method of according to claim 3 pair of sleeve pipe top cover, it is characterized in that: the internal diameter of described outer tube is 79-146mm, the internal diameter of inner sleeve is 60-127mm, the wall thickness 3-5mm of inner sleeve, and the gap between outer tube internal diameter and the external diameter of inner sleeve is not more than 5mm.
7. the construction method of according to claim 3 pair of sleeve pipe top cover, is characterized in that: the rated pressure of the crawler type roof-bolter described 4) is 4-6MPa, and the bottom that sinks down into the inner sleeve at the bottom of hole surpasses the bottom 50cm of outer tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210330539.4A CN102817361B (en) | 2012-09-10 | 2012-09-10 | Double bushing top cover for broken rock curtain grouting and construction method of double bushing top cover |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210330539.4A CN102817361B (en) | 2012-09-10 | 2012-09-10 | Double bushing top cover for broken rock curtain grouting and construction method of double bushing top cover |
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| Publication Number | Publication Date |
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| CN102817361A CN102817361A (en) | 2012-12-12 |
| CN102817361B true CN102817361B (en) | 2014-11-05 |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN104790404B (en) * | 2015-05-05 | 2016-08-24 | 中国电建集团中南勘测设计研究院有限公司 | A kind of dam foundation high-pressure grouting structure and grouting method |
| CN107747317B (en) * | 2017-10-18 | 2023-06-02 | 中国电建集团华东勘测设计研究院有限公司 | Soft rock foundation impervious wall groove bottom sediment treatment method and soft rock foundation impervious wall groove bottom structure |
| CN110258567A (en) * | 2019-05-31 | 2019-09-20 | 李艳 | A kind of double-jacket tube passes through the grouting method of underground obstacle |
| CN110295849B (en) * | 2019-06-27 | 2021-06-22 | 中国二十冶集团有限公司 | Method for grouting holes in petrochemical fracturing zone in shallow rock and drilling assembly |
| CN112709228B (en) * | 2020-12-22 | 2022-11-04 | 河北工程大学 | Crack filling cement grouting method |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2555288Y (en) * | 2002-02-08 | 2003-06-11 | 江苏南水土建工程公司 | High efficiency slurry pouring pipe for foundation engineering |
| CN2616573Y (en) * | 2003-05-19 | 2004-05-19 | 崔开华 | Circulating-in-hole grout plug |
| CN201560425U (en) * | 2009-12-07 | 2010-08-25 | 中交第三航务工程勘察设计院有限公司 | Socketed pile |
| CN202787264U (en) * | 2012-09-10 | 2013-03-13 | 广东省水利水电第三工程局 | Double-bushing top cover for use in curtain grouting of fractured rock masses |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3731939B2 (en) * | 1996-04-26 | 2006-01-05 | ケミカルグラウト株式会社 | Injection method |
| US8272811B2 (en) * | 2009-11-02 | 2012-09-25 | Zhengzhou U-Trust Infrastructure Rehabilitation Ltd. | Process for grouting a curtain with polymer |
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2012
- 2012-09-10 CN CN201210330539.4A patent/CN102817361B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2555288Y (en) * | 2002-02-08 | 2003-06-11 | 江苏南水土建工程公司 | High efficiency slurry pouring pipe for foundation engineering |
| CN2616573Y (en) * | 2003-05-19 | 2004-05-19 | 崔开华 | Circulating-in-hole grout plug |
| CN201560425U (en) * | 2009-12-07 | 2010-08-25 | 中交第三航务工程勘察设计院有限公司 | Socketed pile |
| CN202787264U (en) * | 2012-09-10 | 2013-03-13 | 广东省水利水电第三工程局 | Double-bushing top cover for use in curtain grouting of fractured rock masses |
Non-Patent Citations (1)
| Title |
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| JP特开平9-291525A 1997.11.11 * |
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Owner name: GUANGDONG NO. 3 WATER CONSERVANCYAND HYDRO ELECTRI Free format text: FORMER NAME: GUANGDONG NO. 3 WATER CONSERVANCYAND HYDRO ELECTRIC ENGINEERING BOARD |
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Address after: 523710 No. 63 Tangxia Avenue, Tangxia Town, Guangdong, Dongguan Patentee after: Guangdong Province's water conservancy and hydropower the 3rd Co., Ltd of Engineering Bureau Address before: 523710 No. 63 Tangxia Avenue, Tangxia Town, Guangdong, Dongguan Patentee before: The Guangdong No. 3 Water Conservancy and Hydro-Electric Engineering Board |