CN107339122A - A kind of steel pipe column handles goaf engineering method - Google Patents
A kind of steel pipe column handles goaf engineering method Download PDFInfo
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- CN107339122A CN107339122A CN201710773329.5A CN201710773329A CN107339122A CN 107339122 A CN107339122 A CN 107339122A CN 201710773329 A CN201710773329 A CN 201710773329A CN 107339122 A CN107339122 A CN 107339122A
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- steel pipe
- goaf
- pipe column
- hole
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- E—FIXED CONSTRUCTIONS
- E21—EARTH DRILLING; MINING
- E21F—SAFETY DEVICES, TRANSPORT, FILLING-UP, RESCUE, VENTILATION, OR DRAINING IN OR OF MINES OR TUNNELS
- E21F17/00—Methods or devices for use in mines or tunnels, not covered elsewhere
Abstract
The present invention proposes a kind of steel pipe column processing goaf engineering method, by using by under steel pipe column to mined out region, casting concrete makes it turn into a male cone body with surrounding rock body in steel pipe column, so as to form carrying short column in goaf, reach prevention, the purpose that deformation meets top-out composition deformation is continued in reduction goaf.When being directed to water head site Mined-out Area control, using in steel pipe casting concrete do not change original hydrologic condition, disturbance to underground water and pollution are minimized, the steel pipe column male cone body being supported between the roof and floor of goaf solves steel-pipe pile and passes through the length stake buckling stability that goaf is run into and the negative frictional resistance for acting on a side, steel pipe column male cone body stress is more reasonable, and stability is higher；More conventional grouting treatment, the improvement area in goaf is substantially reduced, reduce material usage, saved cost, efficiency of construction greatly improves.
Description
Technical field
The invention belongs to goaf harnessing technical field, and in particular to a kind of steel pipe column handles goaf engineering method.
Background technology
Goaf refers to the exploitation space that underground is formed after subterranean resource is produced, after subterranean resource produces, cavity week
Enclose original original stress equilibrium state to be destroyed, cause stresses re-distribution, overlying strata are known from experience gradual unstability and produced thereon in goaf
Displacement, cracking, destruction are caving, according to its top covering rockmass deformation and failure degree be roughly divided into " caving zone ", " fracture belt ",
" curved bel ", with the upward development of deformation of subterranean body, when involving to earth's surface, earth's surface produces mobile and deformation, base area
The speed of table movement and deformation is classified as " initial period ", " active period ", " decline phase ", " residual deformation phase ".When on goaf
When carrying out construction activity, the construction of structures thereon will necessarily be deformed by goaf to be influenceed, must before engineering construction is carried out
Goaf must be evaluated, the complexity in the significance level built according to construction and construction place is determined at control measures
Reason.
The processing method for reducing mined out ground deformation is directed to, mainly there is down-hole treatment at present（Below ground）Locate with well
Reason（It is more than ground）.Restricted by cost of winning, domestic mining area exploitation is exploited using sunken method entirely mostly, i.e., goaf is not entered
Row filling treatment, carry out generally requiring during construction activity thereon carrying out processing mode on well, at present to the ground in goaf at
Reason method mainly have slip casting method, digging up and filling in method, heavy-tamping method, across method, pass through method etc..Digging up and filling in method, heavy-tamping method, pass through method
It is primarily adapted for use in the shallower goaf of buried depth；It is mainly used for handling the less regions of scope such as tunnel, pit shaft across method；Slip casting
Method application is wider, most goafs is can be suitably used for by adjusting grout coordinate ratio and grouting process, in processing procedure
All mined out scopes for influenceing its top construction and building construction need to be filled, charging quantity is big；When cavity is larger in goaf,
The unsuitable coagulation forming of slurries；When rich water in goaf, slurries should not solidify when for circumstance of flowing water when, slurries diffusion area increase
Construction cost and slip casting effect can be substantially increased；When goaf is located near water head site, injecting paste material can be with underground water
Flowing affects greatly to groundwater quality.
It is directed to during injecting treatment goaf, construction work amount is big, long in time limit, slurries setting percentage is low, to underground ring
There is certain influence in border.Also steel-pipe pile is taken to pass through goaf, in the administering method of steel casing pack concrete, it is controlled
Thought is managed equivalent to the goaf that mini pile passes through to bottom plate certain depth, by upper load by pile body reach pile body side wall and
Stake end is to reach the purpose for reducing goaf and influenceing, but with the increase of goaf depth, and Rock And Soil adds to steel around steel-pipe pile
The downdrag of pile tube can greatly increase, and the stability and bearing capacity of pile body can substantially reduce, and can increase construction cost and
Difficulty.
The content of the invention
In order to solve defect present in above-mentioned prior art, the present invention proposes a kind of steel pipe column processing goaf work
Method, by using by, to mined out region, casting concrete makes it turn into one with surrounding rock body in steel pipe column under steel pipe column
Male cone body, so as to form carrying short column in goaf, reach prevention, reduction goaf continues deformation and meets that upper building becomes
The purpose of shape.
The technical solution adopted by the present invention：A kind of steel pipe column handles goaf engineering method, and the engineering method comprises the steps of：
Step 1：With reference to proposed place goaf distribution characteristics, surrounding enviroment condition and building characteristic, the plane of drilling is designed
Arrangement and depth；
Step 2：Hole structure is designed by 1 ~ 2 reducing from aperture to bottom hole according to drilling depth and Rock And Soil intensity, i.e., certainly
Upper and lower boring aperture is gradually reduced 1 ~ 2 grade；
Step 3：Tripping in protection pipe after bedrock surface certain depth below is drilled into using large aperture in soil layer, decomposed rock, prevents hole
Wall caves in；
Step 4：Reduce bore diameter and continue to drill through goaf to 1 ~ 2 meter of gob floor；
Step 5：According to goaf data and the integrated degree of hole wall, tripping in seamless steel pipe to bottom hole, described seamless steel pipe
Length exceedes goaf top plate and is no less than 2 meters；
Step 6：To after bottom hole under seamless steel pipe, mixed microlith is irrigated into hole to seamless steel pipe bottom under concreting conduit
Solidifying soil fills out at the top of perfusion to seamless steel pipe 3 ~ 5 meters, forms male cone body；
Step 7：After seamless steel pipe inner concrete initial set, into hole, perfusion mortar carries out sealing of hole.
Preferably, tripping in drilling well Image-forming instrument peephole inwall integrated degree is also included in described step 4.
Preferably, the method for observation hole wall integrated degree is in described step 4：Tripping in ultrasonic probe, to hole wall week
Enclose 360 degree of spatial dimension transmittings and receive ultrasonic signal, scan the geological condition of country rock in the range of 0.5 meter around whole drilling,
The integrity degree of borehole wall is analyzed by speed, amplitude, the frequency of analyzing ultrasonic wave.
Preferably, described seamless steel pipe upper inner is provided with screw thread, is connected by joint with drilling rod, i.e. one end of joint
It is connected with seamless steel pipe, one end is connected with drilling rod, and the hand of spiral at joint both ends is on the contrary, i.e.：The screw thread being connected with seamless steel pipe
For " anti-silk ", the screw thread being connected with drilling rod is " positive silk ".
Seamless steel pipe, joint, drilling rod are connected on ground, in tripping in hole, treat that seamless steel pipe is passed through under goaf to bottom hole
Afterwards, pressurizeed downwards by rig while rotate drilling rod, now, " screw thread " that drilling rod is connected with joint gradually becomes tight, and seamless steel
Manage " screw thread " being connected with joint gradually to fluff until threading off, now, joint disengages with seamless steel pipe, and seamless steel pipe is that tripping in is pre-
Positioning is put, and the process of the concrete perfusion into seamless steel pipe can be entered by above carrying drilling tool.
Preferably, in described step 5, before tripping in seamless steel pipe, nitrolite is put into 3 ~ 5 meters of goaf top plate, led to
Cross explosion and expand aperture, so as to increase the volume of male cone body in step 6.
Beneficial effects of the present invention：When the 1st, being directed to water head site Mined-out Area control, using in steel pipe, casting concrete is not
Change original hydrologic condition, the disturbance to underground water and pollution are minimized.
2nd, the steel pipe column male cone body being supported between the roof and floor of goaf solves steel-pipe pile and passes through the length that goaf is run into
Stake buckling stability and the negative frictional resistance for acting on a side, steel pipe column male cone body stress is more reasonable, and stability is higher.
3rd, more conventional grouting treatment, substantially reduce the improvement area in goaf, reduce material usage, saved into
This, efficiency of construction greatly improves.
4th, when gob floor gradient is larger, the empty highly larger, goaf in goaf is satisfied water, goaf are in dynamic water
When in environment, can there are grouting amount increase, the low shortcoming of slurries calculus rate using the grouting treatment of routine, using steel pipe column engineering method
Because there is the constraint of steel pipe in outside when being administered, construction work amount will not be increased, while can guarantee that preferable regulation effect, should
The accommodation of engineering method is wider.
5th, steel pipe top insertion goaf top plate, the slurry overflowed during slip casting can improve goaf top plate with filled opening
Geological environment.
Brief description of the drawings
Fig. 1 is the embodiment of the present invention 1, the steel pipe column schematic diagram for completion of constructing；
Fig. 2 is the steel pipe column schematic diagram that the present invention administers water head site goaf；
Fig. 3 is the steel pipe column schematic diagram that the present invention administers Inclined Mined；
Fig. 4 is drilling plane layout drawing partial schematic diagram in embodiment 1；
In figure, 1, soil layer, 2, decomposed rock, 3, rock stratum, 4, goaf top plate, 5, goaf, 6, gob floor, 7, soil layer set
Pipe, 8, concreting conduit, 9, seamless steel pipe, 10, crack, 11, concrete, 12, mortar, 13, waterline.
Embodiment
In order to further illustrate the ins and outs of the present invention, illustrated in conjunction with accompanying drawing and Specific construction case.
Step 1, with reference to proposed place goaf distribution characteristics, surrounding enviroment condition and building characteristic, drilling is designed
Horizontal layout and depth；
According to《Coal mine gob is built（Structure）Build thing foundation treatment technology specification》、《Goaf（Cavity）Prospective design and construction are controlled
Manage handbook》Deng the relevant requirement of specification, with reference to goaf cavity size, the fractured situation and plan of overlying Rock And Soil
The factors such as construction of structures facade plane arrangement form, load, base form are built, it is comprehensive to determine drilling plane arrangement, hole depth
Coal seam depth according to disclosed by the data such as data collection early stage, survey Evaluation determines.The step is the conventional judgement before construction
Means, to those skilled in the art, implementation can be determined how according to specification requirement.
Step 2,3：Hole structure is designed by 1 ~ 2 change from aperture to bottom hole according to drilling depth and Rock And Soil intensity
Footpath, i.e., boring aperture is gradually reduced 1 ~ 2 grade from top to bottom, and below bedrock surface is drilled into using large aperture in soil layer 1, decomposed rock 2
Tripping in protection pipe afterwards（Soil layer sleeve pipe 7）, prevent hole wall collapse.Boring aperture size mainly according to hole depth, rock-soil layer degree of crushing,
The factors such as steel pipe column diameter, are designed for actual conditions.Reducing is set generally between soil layer 1 and rock stratum 3,
Tripping in protection pipe simultaneously（Soil layer sleeve pipe 7）.The main reason for this layer of position drilling reducing is soil layer 1 and the physico-mechanical properties of rock stratum 3
Difference is larger, and Weathering Zones of Igneous Rock is serious, rock crushing, and underground water is generally stranded between soil layer 1 and rock stratum 3, increases the boundary
The unstability in face, chip off-falling collapse hole easily occurs for collision disturbance of the drilling tool to hole wall, the region in hole in addition, and therefore, drilling is deep
After degree passes through rock-soil layer interface and reaches stable rock stratum, tripping in and boring aperture protection pipe of a size（Soil layer sleeve pipe 7）
To intact rock, boring aperture diminution one-level is continued to creep into downwards.In drilling process, if running into rock stratum smashed to pieces
（Such as wear the mined out region of multilayer）, during pore-forming difficulty, can meet on the basis of design requirement can as stated above, then one layer of guarantor of tripping in
Pillar（Soil layer sleeve pipe 7）, reduced bore, to reach the purpose by broken rock.Aperture specification presses DCDMA standards, φ 108,
φ 127, φ 146, φ 168 etc., or the standard geology tubing that in the market is general.
Step 4：Reduce bore diameter to continue after drilling through goaf to 1 ~ 2 meter of bottom plate, the complete journey of peephole inner hole wall
Degree；Specifically engineering method is：Tripping in ultrasonic probe, to hole wall around the transmitting of 360 degree of spatial dimensions and receive ultrasonic signal, scanning is whole
Around individual drilling in the range of 0.5 meter country rock geological condition, by analyzing the speed of ultrasonic wave, amplitude, frequency to borehole wall
Integrity degree analyzed.The purpose of peephole inwall integrated degree has two：
（1）By observing mined out zone position and its surrounding cranny development degree, control is carried out with guiding construction and to construction quality
（Concrete is filled in the length of tripping in seamless steel pipe and hole exceed steel pipe column top to obtain by observing goaf cavity size
The parameter informations such as the height in face）.
（2）, can tripping in imager observation hole wall cranny development when creeping into difficult if occurring hole wall collapse in boring procedure
Situation, to find out drilling well difficult reason, while according to information such as crack size, length, allotment mortar, concrete, it is injected into
In hole, after its solidification, continue drilling in foramen primum position to gob floor 6（Hole wall is after mortar, concrete strengthening, beneficial to applying
The continuation of work, while be advantageous to the tripping in of seamless steel pipe 9 to design level position）.
Step 5,6：According to goaf data and the integrated degree of hole wall, tripping in seamless steel pipe 9 to bottom hole, described nothing
Stitch the length of steel pipe 9 and exceed goaf top plate no less than 2 meters；To after bottom hole under seamless steel pipe 9, by under concreting conduit 8 extremely
The bottom of seamless steel pipe 9 irrigates pea gravel concreten into hole and fills out perfusion to 3 ~ 5 meters of the top of seamless steel pipe 9, forms male cone body.
Before tripping in seamless steel pipe, nitrolite can be put into 3 ~ 5 meters of goaf top plate, pass through explosion expanded hole
Footpath, increase steel pipe column（The penetration concrete 11 of seamless steel pipe 9 forms steel pipe column）The volume of the male cone body on top, so as to play increase
The effect of steel pipe column support force.Influenceed by downhole explosion, hole wall collapse, seamless steel pipe can not tripping in original drilling depth, need to carry out
Subsequent step can be carried out after cleaning bottom of hole, the specific method of cleaning bottom of hole is：In foramen primum position tripping in drilling tool, it is drilled into former depth and takes out in hole
Fragmented rock body（1 ~ 2 meter of gob floor is drilled into again）, subsequent step can be carried out.
Step 7：After the initial set of 9 inner concrete of seamless steel pipe 11, into hole, perfusion mortar 12 carries out sealing of hole.
Embodiment 1, Xuzhou Huai-Hai art work show center east is successfully applied to steel pipe column processing goaf engineering method
Exemplified by the building yard of southern side, the ins and outs of this engineering method are introduced.
45 meters or so of the plot underground is 22 coal goafs, and run of mine coal seam working thickness is 1.0 meters or so, and probing discloses mined out
Region core crushes, and falls to bore up to 10cm.
As shown in figure 1, the structure of Mined-out Area control stake holes is：The tripping in φ 168mm retaining wall of thin-wall steel tube 1, rock in soil layer 1
Layer segment aperture is φ 146mm, and stake bottom should be crept into 22 coal seam floor 1.0m, and stake holes horizontal layout is that every row transverse direction pilespacing is 2 meters,
Line-spacing is 2 meters, and often the stake holes of row stake holes and adjacent lines is staggeredly arranged, as shown in Figure 4.
φ 146mm seamless steel pipe 9, wall thickness 8mm, steel pipe hollow space fill C35 pea gravel concretens 11 under mined out section,
Steel pipe column length is according to the situation in goaf, it is ensured that 1.0m is no less than below 22 coal goafs, 22 coal goaf roofs 4 are not
Less than 2.0m., to after bottom hole, C35 pea gravel concretens 11 will be irrigated under seamless steel pipe 9 into hole using concreting conduit 8 and filled
Fill out at the top of perfusion to steel pipe column above 3.5m.After the initial set of steel pipe inner concrete 11, into hole, perfusion mortar 12 carries out sealing of hole.
Under this place after the completion of Mined-out Area control, proposed building is built by laying bricks or stones when foundation trench is excavated before basis, should be backbreak no less than 0.5m, laying
Blotter（Thickness is no less than 0.5m）, and carry out compacting processing by relevant specification.
The advantage of the present invention is also embodied in when the gradient of gob floor 6 is larger, the empty highly larger, goaf in goaf
The processing that full water, goaf are in circumstance of flowing water, several situations of the above all can cause conventional grouting treatment to have slip casting
Amount increase, the low shortcoming of slurries calculus rate, and can also be in the presence of the disturbance and dirt to underground water when administering water head site goaf
Dye.Because there is the constraint of steel pipe in outside when the present invention is administered using steel pipe column engineering method, as shown in Fig. 2 during grouting, slurry is straight
Connect and fill into steel pipe, and form male cone body, supporting effect is good, and will not increase construction work amount, realizes preferable regulation effect.
Claims (6)
1. a kind of steel pipe column handles goaf engineering method, the engineering method comprises the steps of：
Step 1：With reference to proposed place goaf distribution characteristics, surrounding enviroment condition and building characteristic, the plane of drilling is designed
Arrangement and depth；
Step 2：Hole structure is designed by 1 ~ 2 reducing from aperture to bottom hole according to drilling depth and Rock And Soil intensity, i.e., certainly
Upper and lower boring aperture is gradually reduced 1 ~ 2 grade；
It is characterized in that, further comprising the steps of：
Step 3：The rear tripping in protection pipe of below bedrock surface is drilled into using large aperture in soil layer, decomposed rock, prevents hole wall collapse；
Step 4：Reduce bore diameter and continue to drill through goaf to 1 ~ 2 meter of gob floor；
Step 5：To bottom hole, described seamless steel pipe top exceedes goaf top plate and is no less than 2 meters tripping in seamless steel pipe；
Step 6：To after bottom hole under seamless steel pipe, mixed microlith is irrigated into hole to seamless steel pipe bottom under concreting conduit
Solidifying soil fills out at the top of perfusion to seamless steel pipe 3 ~ 5 meters, forms male cone body.
A kind of 2. steel pipe column processing goaf engineering method according to claim 1, it is characterised in that：In described step 4 also
Including tripping in drilling well Image-forming instrument peephole inwall integrated degree.
A kind of 3. steel pipe column processing goaf engineering method according to claim 2, it is characterised in that：Seen in described step 4
The method of gaging hole inwall integrated degree is：Tripping in ultrasonic probe, to hole wall around the transmitting of 360 degree of spatial dimensions and receive ultrasound
Signal, the geological condition of country rock in the range of 0.5 meter around whole drilling is scanned, by speed, amplitude, the frequency of analyzing ultrasonic wave
The integrity degree of borehole wall is analyzed.
A kind of 4. steel pipe column processing goaf engineering method according to claim 1, it is characterised in that：In described seamless steel pipe
Side is provided with external screw thread.
A kind of 5. steel pipe column processing goaf engineering method according to claim 1, it is characterised in that：In described step 5, under
Before entering seamless steel pipe, nitrolite is put into 3 ~ 5 meters of goaf top plate, aperture is expanded by explosion, so as to increase anchor in step 6
The volume of cock body.
A kind of 6. steel pipe column processing goaf engineering method according to claim 1, it is characterised in that：Described steel pipe column processing
Goaf engineering method also includes step 7：After seamless steel pipe inner concrete initial set, into hole, perfusion mortar carries out sealing of hole.
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Cited By (5)
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| CN107939280A (en) * | 2017-11-14 | 2018-04-20 | 中国科学院寒区旱区环境与工程研究所 | Drilling rig and boring method |
| CN110425004A (en) * | 2019-08-16 | 2019-11-08 | 徐州中国矿大岩土工程新技术发展有限公司 | The floated guide and construction method in the underwater goaf of paste body filling |
| CN110672062A (en) * | 2019-08-23 | 2020-01-10 | 广州市地质调查院(广州市地质环境监测中心) | Embedding method of monitoring points for monitoring settlement of bedrock |
| CN112855029A (en) * | 2021-04-26 | 2021-05-28 | 中铁九局集团第七工程有限公司 | Goaf drilling external pipe expansion construction method |
| CN114108609A (en) * | 2021-09-29 | 2022-03-01 | 华北水利水电大学 | Goaf multistage subsection precise filling deep pile-forming construction process and method |
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| CN112855029A (en) * | 2021-04-26 | 2021-05-28 | 中铁九局集团第七工程有限公司 | Goaf drilling external pipe expansion construction method |
| CN114108609A (en) * | 2021-09-29 | 2022-03-01 | 华北水利水电大学 | Goaf multistage subsection precise filling deep pile-forming construction process and method |
| CN114108609B (en) * | 2021-09-29 | 2023-03-10 | 华北水利水电大学 | Construction method for multistage segmented precise filling and deep pile forming in goaf |
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|---|---|
| CN107339122B (en) | 2020-02-11 |
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Address after: 221000 10th floor, building C6, Xuzhou Software Park, No. 6, Software Park Road, Quanshan District, Xuzhou City, Jiangsu Province Patentee after: Xuzhou Zhongkuang geotechnical Technology Co.,Ltd. Address before: Room 101, unit 1, building 1, science and Technology Incubation Center, National University Science and Technology Park, China University of mining and technology, Xuzhou City, Jiangsu Province Patentee before: CUMT GEOTECHNICAL ENGINEERING & NEW TECHNOLOGY DEVELOPMENT Co.,Ltd. |
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