CN103046513A - Method for coating and sealing fracture of bed rock in uncovered heavy consolidation grouting - Google Patents
Method for coating and sealing fracture of bed rock in uncovered heavy consolidation grouting Download PDFInfo
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- CN103046513A CN103046513A CN201210558955XA CN201210558955A CN103046513A CN 103046513 A CN103046513 A CN 103046513A CN 201210558955X A CN201210558955X A CN 201210558955XA CN 201210558955 A CN201210558955 A CN 201210558955A CN 103046513 A CN103046513 A CN 103046513A
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Abstract
The invention discloses a method for coating and sealing a fracture of a bed rock in uncovered heavy consolidation grouting. The method comprises the steps of: firstly cleaning to remove impurities in the fracture of a rock body after the evenness of a base rock body to be grouted reaches to a design requirement; then coating a cement base waterproof material on the fracture of the rock body after keeping the surface of the rock body wet for 1-2 hours; checking an appearance effect of the coating layer after the final setting time of the cement base waterproof material arrives and coating the cement base waterproof material again on the places with empty holes or fractures; and then performing pressurized-water check, marking the fractures of the rock body with water seepage and water emission, and coating the cement base waterproof material again on the fractures of the rock body until the pressurized-water check shows that the fractures of the rock body have no water leakage. The method for coating and sealing the fracture of the bed rock in the uncovered heavy consolidation grouting, disclosed by the invention, not only overcomes the disadvantages of convenient fracture processing ways such as concrete sealing, spraying thin layer structure sealing, chisel groove and caulking sealing, and bare rock without sealing, and realizes a relative good consolidation grouting effect, but also has the characteristics of being convenient and rapid in construction, low in interference, economic, safe and reliable.
Description
Technical field
The present invention relates to rock for hydraulic structure consolidation process technical field, refer to particularly the bedrock fracture brushing sealing method in a kind of nongravity capping concretion grouting.
Background technology
Along with the quickening of hydroelectric project development rate, a lot of engineerings attempt having adopted multi-form nongravity capping concretion grouting construction technology, the conspicuous contradiction between building with solution dam foundation consolidation grouting and dam concrete.
Various nongravity capping concretion grouting techniques all have its scope of application, and difference is mainly manifested in the in form difference to some extent for crack sealing.Crack processing mode in the nongravity capping concretion grouting mainly contains following several at present: 1. utilize concrete that the thick gross area closed operation of 30～50cm is carried out on the rock mass surface; 2. spray the laminate structures such as the thick mortar of 10～15cm or concrete the gross area sealing is carried out on the rock mass surface; 3. basement rock raggle filleting sealing; 4. not doing any sealing on naked scar directly is in the milk.Be under the block crack rock condition at basement rock, the problem that above-mentioned several sealing modes exist is:
(1) concrete enclosing method: dam foundation face closure concrete leveling, general thick 30cm～50cm treats that concrete reaches 70% design strength, carries out the consolidation grouting construction, concrete was as the concrete part of dam foundation after construction was finished.This method need to wait for that concrete setting reaches design strength and could be in the milk, and takies the straight line duration, and concrete during grouting construction because the crack easily occurs in the variation of external temperature and humidity environment, easily unfavorable to safety of dam body.
(2) spray laminate structure sealing method: the concrete that occlude crack is used or mortar structure thinner thickness, very easily lift distortion, cracking in the filling process, its crack sealing effect is difficult for guaranteeing.Also can guarantee the normal enforcement of grouting even do not ftracture, also have two aspect problems: if 1. enclosed construction is not removed, there is one deck shell in the later stage between top dam body and bottom bedrock surface, be unfavorable for the dam Against Sliding Stability, affects engineering safety; If 2. with enclosed construction after grouting is finished, dam concrete removed before building, it is also more loaded down with trivial details then to remove construction, needs labor intensive and equipment, increases duration and waste resource.
(3) raggle filleting sealing method: before the grouting rock cranny of exposure on the dam foundation face is unified raggle, then adopt rapid setting cement, mortar, cotton yarn etc. to carry out the filleting shutoff and process, mainly take manual work as main, be aided with the small-sized machine construction.This method subject matter is that workload is large, and construction sequence is loaded down with trivial details, and work efficiency is low.
(4) naked rock is without the sealing method: directly carry out nongravity capping concretion grouting at the naked rock of dam, owing to ground crack is not effectively sealed before filling with, earth's surface string in the filling process, grout are serious, the effective grouting pressure of basement rock is lower, grouting effect is relatively poor, directly affect the ability of barrier performance, supporting capacity and the adaptive deformation of shallow-layer rock mass, so seldom in engineering practice, adopt.
In sum, existing nongravity capping concretion grouting crack processing method is not enough to the specific aim of crack rock, fails to take full advantage of the characteristics of rock mass self, and processing procedure is lengthy and tedious, is unfavorable for carrying out smoothly of engineering.
Summary of the invention
The object of the invention is to overcome and have in the existing rock mass consolidation grouting method that engineering quantity is large, processing procedure is lengthy and tedious and the defective of poor effect, provide a kind of easy construction, quick, disturb the bedrock fracture brushing in little, economical, the safe and reliable nongravity capping concretion grouting to seal method.
For achieving the above object, the bedrock fracture brushing sealing method in the nongravity capping concretion grouting involved in the present invention may further comprise the steps:
(1) Rock Mass to be in the milk and planeness reach designing requirement, and impurity in the rock cranny is removed in cleaning;
(2) behind maintenance rock mass surface wettability 1～2h, to rock cranny brushing cement group water-proofing material, brushing thickness is 0.8～1.5mm, along the brushing of rock mass crack to stitching each 2 ~ 3cm of both sides;
(3) reach the final setting time of cement group water-proofing material after, carry out the inspection of appearance of coat effect, and for hollowing or crack place occurring, remove its former cement group water-proofing material coating, then again moistening rock mass surface and brushing cement group water-proofing material;
(4) after the appearance of coat effect has checked, carry out the setting-out inspection, pressure is 0.09～0.11MPa, there is infiltration in mark, emits the rock cranny of water, and in this rock cranny place repeating step (2), (3), until till setting-out checks that rock cranny is water-tight, show that rock cranny is in closed state.
Preferably, the gelling time≤1h of described cement group water-proofing material, with wet basis scar adhesion strength 〉=1MPa, anti-permeability strength 〉=1.2MPa.
Preferably, described cement group water-proofing material is cementitious capillary waterproofing material.
Preferably, the brushing method of brushing cement group water-proofing material is 2 brushings in described step (2), (3), front once the brushing finish after, being coated with the brush layer surface begins dehydration and carries out the atomized water spray moist curing when turning white, after reaching the final setting time of cement group water-proofing material,, once brush after namely carrying out without sharp trace with light finger extrusion layer.
Beneficial effect of the present invention: the bedrock fracture brushing sealing method in the nongravity capping concretion grouting, comparatively similar with injection laminate structure sealing method of the prior art, adopted equally the mode of laminate structure as the sealing rock cranny, it is only to seal for rock cranny that but difference is this method, rather than for whole rock mass surface, engineering quantity is dwindled greatly, and owing to adopted the waterproofing materials of cement based, has overcome insecure this technical problem of local brushing sealing.Adopt the inventive method, not only overcome existing concrete sealing, the sealing of injection laminate structure, the sealing of raggle filleting and the naked rock defective without several cracks of sealing processing mode, reach preferably effect of consolidation grouting, and have easy construction, quick, disturb little, economic, safe and reliable characteristics.
1) compare with the concrete enclosing method: need not to build the thick concrete leveling of 30～50cm, need not wait as long for, do not account for the straight line duration, the distress in concrete that also can not occur building is to the disadvantageous situation of safety of dam body.
2) compare with injection laminate structure sealing method: need not to adopt thin-lift concrete or mortar that bedrock surface is carried out the gross area sealing, do not affect stability of dam foundation, also do not need to clear up, significantly improve efficiency of construction, greatly cost saving.
3) compare with raggle filleting sealing method: no longer rock cranny is unified the raggle filleting, workload is little, and construction sequence is simple, and work efficiency is higher.
4) compare without the sealing method with naked rock: the dam rock cranny has been carried out effective sealing, guaranteed the grouting pressure lifting, can effectively pour into dam.
Facts have proved that adopt the inventive method can satisfy the nongravity capping concretion grouting pressure requirement of 0.3～1.0MPa, grouting effect is good.Efficiently solve dam foundation consolidation grouting and the dam concrete conspicuous contradiction between building, shortened the duration, remarkable in economical benefits.
Description of drawings
Fig. 1 is the structural representation on rock mass surface after the bedrock fracture brushing sealing method brushing that utilizes in the nongravity capping concretion grouting.
Fig. 2 utilizes sectional structure schematic diagram after the inventive method brushing for the rock cranny of≤2mm width.
Fig. 3 is the sectional structure schematic diagram after the rock cranny of 2～10mm width is dug V-shaped groove and utilized the inventive method brushing.
Fig. 4 is the sectional structure schematic diagram after the rock cranny of 10～50mm width is dug U-lag and utilized the inventive method brushing.
The specific embodiment
The present invention is described in further detail below in conjunction with the drawings and specific embodiments.
For the high Method of Arch Dam Foundation rock mass of Goupitai Hydropower Station, adopt the bedrock fracture brushing sealing method in the nongravity capping concretion grouting, step is as follows:
(1) dam excavation bedrock surface 1 is is tentatively checked and accepted, required the Rock Mass of bedrock surface 1 and planeness to reach pre-provisioning request.Adopt water under high pressure or wind to wash to bedrock surface 1, remove the impurity such as rock cranny 2 clip surface mud, grease, dirt with the steel brush cleaning.
(2) 1h～2h before the formal brushing drenches bedrock surface 1 with spray water, guarantees that it is in moisture state.
With the building coating banister brush along rock cranny 2 brushing cementitious capillary waterproofing material (cementitious capillary waterproofing materials, should satisfy gelling time≤1h, with the key technical indexes such as wet basis scar adhesion strength 〉=1MPa, anti-permeability strength 〉=1.2MPa), along the brushing of rock mass crack to stitching each 2 ~ 3cm of both sides, divide 2 times brushings, every layer of brushing thickness is 0.8mm～1.5mm, and is unsuitable blocked up.Coating should stir, with mixing with brush.
The 1st time the brushing finish after, be coated with the brush layer surface begin the dehydration can carry out the atomized water spray moist curing when turning white.Use light finger extrusion brush layer without sharp trace behind the 1h, can carry out the 2nd time brushing.Wider position, crack can suitably increase brushing number of times and scope, but should guarantee that coating layer thickness is even.
(3), the appearance of coat effect is checked after all construction is finished, is coated with brush material the 2nd time and reaches final setting time 1h at waterproof coating.If any hollowing or crack, should remove former cement group water-proofing material coating after, again brush waterproofing materials 2 times, the brushing operate according to step (2).
(4) after the appearance of coat effect has checked, carry out the setting-out inspection, the general 0.1MPa of pressure.There is the rock cranny ooze, emit water in mark, and step (2), (3) replenish and process, until till setting-out checks that rock cranny is water-tight, show that rock cranny is in closed state.
Crack brushing sealing finish and passed examination after, carry out consolidation grouting boring, as shown in Figure 1 at bedrock surface 1, be distributed with a plurality of grout holes 4 and many crack closed squeegee bands 3 on the bedrock surface 1.Then can carry out grouting construction, grouting method, segmentation, pressure and other parameters are identical with conventional grouting method.
Need to prove, the method of above-mentioned direct brushing is fit to the situation (such as Fig. 2) of rock cranny≤2mm, if above-mentioned rock cranny width is larger, scope is at 2～10mm, then can dig V-shaped groove along its slit, after cleaning out V-shaped groove with steel brush, fill with cementitious capillary waterproofing material again and get final product (such as Fig. 3); If the rock cranny width range is at 10～50mm, then above-mentioned V-shaped groove should replace with U-lag (such as Fig. 4), and fill complete V-shaped groove, U-lag all should tamp, floating, to seal this larger rock cranny; To the rock cranny width〉directly process with the concrete replacement sealing behind the Geological Defects position excavations such as 50mm and zone of fracture, tomography.
Adopt the inventive method that the high Method of Arch Dam Foundation crack rock of Goupitai Hydropower Station is processed with existing several enclosure methods and compare, difference on effect is as follows:
1) compares with the concrete enclosing method: shortened the duration of six months, and the concrete cracking that can not occur building is to the disadvantageous situation of safety of dam body.
2) compare with injection laminate structure sealing method: need not bedrock surface is carried out the gross area sealing, do not affect stability of dam foundation, also do not need to clear up, significantly improve efficiency of construction, save direct construction investment more than 1,500 ten thousand yuan.
3) compare with raggle filleting sealing method: no longer rock cranny is unified the raggle filleting, the workload of the inventive method approximately only has 1/4 of raggle filleting sealing method, and construction sequence is simple, and work efficiency is higher.
4) compare without the sealing method with naked rock: effective sealing has been carried out in the Dam Foundation Rock crack, guaranteed the grouting pressure lifting, can effectively pour into dam foundation.
Claims (4)
1. the sealing of the bedrock fracture brushing in nongravity capping concretion grouting method may further comprise the steps:
(1) Rock Mass to be in the milk and planeness reach designing requirement, and impurity in the rock cranny is removed in cleaning;
(2) behind maintenance rock mass surface wettability 1～2h, to rock cranny brushing cement group water-proofing material, brushing thickness is 0.8～1.5mm, along the brushing of rock mass crack to stitching each 2 ~ 3cm of both sides;
(3) reach the final setting time of cement group water-proofing material after, carry out the inspection of appearance of coat effect, and for hollowing or crack place occurring, remove its former cement group water-proofing material coating, then again moistening rock mass surface and brushing cement group water-proofing material;
(4) after the appearance of coat effect has checked, carry out the setting-out inspection, pressure is 0.09～0.11MPa, there is infiltration in mark, emits the rock cranny of water, and in this rock cranny place repeating step (2), (3), until till setting-out checks that rock cranny is water-tight, show that rock cranny is in closed state.
2. the sealing of the bedrock fracture brushing in described nongravity capping concretion grouting method according to claim 1 is characterized in that: the gelling time≤1h of described cement group water-proofing material, with wet basis scar adhesion strength 〉=1MPa, anti-permeability strength 〉=1.2MPa.
3. the sealing of the bedrock fracture brushing in described nongravity capping concretion grouting method according to claim 2, it is characterized in that: described cement group water-proofing material is cementitious capillary waterproofing material.
4. according to claim 1 and 2 or the bedrock fracture brushing in 3 described nongravity capping concretion groutings sealing method, it is characterized in that: the brushing method of brushing cement group water-proofing material is 2 brushings in described step (2), (3), front once the brushing finish after, being coated with the brush layer surface begins dehydration and carries out the atomized water spray moist curing when turning white, after reaching the final setting time of cement group water-proofing material,, once brush after namely carrying out without sharp trace with light finger extrusion layer.
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Cited By (8)
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| CN103741694A (en) * | 2013-12-25 | 2014-04-23 | 长江勘测规划设计研究有限责任公司 | Method for controlling leakage of grouting treatment vertical type asphalt concrete core wall earth-rock dam |
| CN104790404A (en) * | 2015-05-05 | 2015-07-22 | 中国电建集团中南勘测设计研究院有限公司 | Dam foundation high-pressure grouting structure and method |
| CN104929129A (en) * | 2015-06-25 | 2015-09-23 | 中国电建集团华东勘测设计研究院有限公司 | Concrete cover-weight consolidation grouting method for non-cover-weight combination of different holes through guide pipes |
| CN106368173A (en) * | 2016-10-25 | 2017-02-01 | 河海大学 | Method for calculating width of arch dam crack and determining thickness of anti-seepage material |
| CN106917409A (en) * | 2017-03-27 | 2017-07-04 | 中国水利水电第四工程局有限公司 | A kind of rock lid weight consolidation grouting construction method |
| CN107119705A (en) * | 2017-06-19 | 2017-09-01 | 中国电建集团贵阳勘测设计研究院有限公司 | Concrete toe board foundation reinforcing structure and method placed on unloading rock mass |
| CN107938602A (en) * | 2017-11-20 | 2018-04-20 | 长江勘测规划设计研究有限责任公司 | A kind of method and enclosed construction for handling the roomy crack of rock mass |
| CN109778859A (en) * | 2019-03-12 | 2019-05-21 | 长江勘测规划设计研究有限责任公司 | A kind of full dam of high concrete dam is without storehouse surface consolidation grouting method and structure |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103741694A (en) * | 2013-12-25 | 2014-04-23 | 长江勘测规划设计研究有限责任公司 | Method for controlling leakage of grouting treatment vertical type asphalt concrete core wall earth-rock dam |
| CN103741694B (en) * | 2013-12-25 | 2016-03-30 | 长江勘测规划设计研究有限责任公司 | The method of controlled grouting process vertical-type asphaltic concrete core wall earth and rockfill dam seepage |
| CN104790404A (en) * | 2015-05-05 | 2015-07-22 | 中国电建集团中南勘测设计研究院有限公司 | Dam foundation high-pressure grouting structure and method |
| CN104929129A (en) * | 2015-06-25 | 2015-09-23 | 中国电建集团华东勘测设计研究院有限公司 | Concrete cover-weight consolidation grouting method for non-cover-weight combination of different holes through guide pipes |
| CN106368173A (en) * | 2016-10-25 | 2017-02-01 | 河海大学 | Method for calculating width of arch dam crack and determining thickness of anti-seepage material |
| CN106368173B (en) * | 2016-10-25 | 2018-07-06 | 河海大学 | A kind of method for calculating arch dam fracture width and determining impervious material thickness |
| CN106917409A (en) * | 2017-03-27 | 2017-07-04 | 中国水利水电第四工程局有限公司 | A kind of rock lid weight consolidation grouting construction method |
| CN107119705A (en) * | 2017-06-19 | 2017-09-01 | 中国电建集团贵阳勘测设计研究院有限公司 | Concrete toe board foundation reinforcing structure and method placed on unloading rock mass |
| CN107938602A (en) * | 2017-11-20 | 2018-04-20 | 长江勘测规划设计研究有限责任公司 | A kind of method and enclosed construction for handling the roomy crack of rock mass |
| CN109778859A (en) * | 2019-03-12 | 2019-05-21 | 长江勘测规划设计研究有限责任公司 | A kind of full dam of high concrete dam is without storehouse surface consolidation grouting method and structure |
| CN109778859B (en) * | 2019-03-12 | 2023-12-12 | 长江勘测规划设计研究有限责任公司 | Concrete high dam all-dam non-bin surface consolidation grouting method and structure |
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Application publication date: 20130417 |