CN110424971A - The method for handling jacked piles with small section landslide - Google Patents

The method for handling jacked piles with small section landslide Download PDF

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Publication number
CN110424971A
CN110424971A CN201910768423.0A CN201910768423A CN110424971A CN 110424971 A CN110424971 A CN 110424971A CN 201910768423 A CN201910768423 A CN 201910768423A CN 110424971 A CN110424971 A CN 110424971A
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CN
China
Prior art keywords
drilling
ductule
landslide
small
hole
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CN201910768423.0A
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Chinese (zh)
Inventor
李正
王进春
陈晓军
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Powerchina Chengdu Engineering Co Ltd
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Powerchina Chengdu Engineering Co Ltd
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Priority to CN201910768423.0A priority Critical patent/CN110424971A/en
Publication of CN110424971A publication Critical patent/CN110424971A/en
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    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D11/00Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
    • E21D11/04Lining with building materials
    • E21D11/10Lining with building materials with concrete cast in situ; Shuttering also lost shutterings, e.g. made of blocks, of metal plates or other equipment adapted therefor
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D11/00Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
    • E21D11/14Lining predominantly with metal
    • E21D11/15Plate linings; Laggings, i.e. linings designed for holding back formation material or for transmitting the load to main supporting members
    • E21D11/152Laggings made of grids or nettings
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D11/00Lining tunnels, galleries or other underground cavities, e.g. large underground chambers; Linings therefor; Making such linings in situ, e.g. by assembling
    • E21D11/14Lining predominantly with metal
    • E21D11/18Arch members ; Network made of arch members ; Ring elements; Polygon elements; Polygon elements inside arches
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D9/00Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
    • E21D9/001Improving soil or rock, e.g. by freezing; Injections
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D9/00Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
    • E21D9/04Driving tunnels or galleries through loose materials; Apparatus therefor not otherwise provided for
    • EFIXED CONSTRUCTIONS
    • E21EARTH DRILLING; MINING
    • E21DSHAFTS; TUNNELS; GALLERIES; LARGE UNDERGROUND CHAMBERS
    • E21D9/00Tunnels or galleries, with or without linings; Methods or apparatus for making thereof; Layout of tunnels or galleries
    • E21D9/12Devices for removing or hauling away excavated material or spoil; Working or loading platforms

Abstract

The invention discloses a kind of methods of processing jacked piles with small section landslide, it is related to technical field of tunnel construction, purpose is to provide technically simple one kind, strong operability, low cost and effective advanced support method compared with landslip for processing jacked piles with small section weak broken wall rock hole section.The technical solution adopted by the present invention is that: the method for processing jacked piles with small section landslide is reinforced by the loose slag body to the body that caves in hole, more than spring line, ductule and injecting cement paste is made to become whole, is formed the shell of effectively support top loose rock mass;Preconsolidation is carried out to the body that caves in below spring line, the method that remaining core soil in advance is taken in tapping process carries out excavation supporting, and then safely and fast passes through landslide section.The present invention compared with landslip and can not continue the case where slagging tap for jacked piles with small section weak broken wall rock hole section suitable for processing face and top, and the technology of the present invention is simple, strong operability and effective, can accelerate construction progress, and reduce construction safety risk.

Description

The method for handling jacked piles with small section landslide
Technical field
It is specifically a kind of to be suitable for jacked piles with small section weak broken wall rock hole the present invention relates to technical field of tunnel construction The method that the landslide that section occurs is handled.
Background technique
After cave in accident occurs in jacked piles with small section weak broken wall rock hole section, current common processing method mainly has following Three kinds: method one: slip casting anchors method.This method is the slip casting anchor based on " non-casing pipe hole forming technology " and " middle-high pressure grouting " Gu method sump remedy scheme.Method two: steel tube shed grouting advance support method, also known as small pilot tunnel method.This method mainly uses slip casting Steel tube shed is aided with slip casting ductule, carries out pre support to landslide body, using short drilling depth, stage by stage excavates, the supporting to landslide body Accomplish with digging with branch.Method three: single per-fore pouring liquid with small pipe preconsolidation method.This method using advanced tubule to landslide body into Row preconsolidation, make to cave in body and slip casting ductule form combination, and enhancing resists tunnel top and collapses load and impact load Ability.
It is the key that scheme success or failure that slip casting, which anchors " the non-casing pipe hole forming technology " that method uses, in ravelly ground, is especially existed Landslide be easy to cause collapse hole in vivo, and the scheme of often leading to can not be successfully implementation.Steel tube shed starches advance support and uses slip casting steel tube shed It is aided with slip casting ductule, is suitable for processing big cross section landslip hole section, technology is complex, higher cost.
For loose crushing and landslide body is along the biggish hole section of hole axis direction development range, single per-fore pouring liquid with small pipe Preconsolidation method has some limitations: if first, the advanced tubule elevation angle is smaller, more than spring line cave in body grouting reinforcement Finite thickness can not form certain thickness induration as top and provide enough bearing capacities;Wherein, grouting reinforcement depth is got over Shallowly, consolidation body thickness is smaller.If second, the advanced tubule elevation angle is larger, though it can consolidating in spring line adequate thickness formed above Knot body, but in view of the operability of construction, the elevation angle is larger in jacked piles with small section just will limit drilling depth, may cause nothing Method selects the problem of advanced tubule of appropriate length.Meanwhile in the case that the advanced tubule elevation angle is big, excavated not in landslide body Break during promoting, with being continuously increased for cutting depth, ductule and the design hole digging line deviation of hole top are bigger, will increase out Difficulty is dug, and there is also the indurations below ductule without effective support due to causes the possibility of secondary landslide.
Summary of the invention
For deficiency existing for the above technology, the present invention carries out on the basis of single per-fore pouring liquid with small pipe preconsolidation method It improves, is processing jacked piles with small section weak broken wall rock hole section compared with landslip, a kind of technically simple, strong operability, cost are provided Low and effective advanced support method.
The present invention realize above-mentioned purpose the technical solution adopted is that: the method for processing jacked piles with small section landslide, including it is following Step:
S1, installation support frame Tunnel Reinforcement
Have the position of execution conditions at new face slag body rear, first removes footing dross, then be supported frame supporting Construction;
Specific: in step S1, support frame is bracing members frame or steel grating, the supporting surface and tunnel of bracing members frame and steel grating Hole median perpendicular, up and down deviation are within ± 5cm, gradient is less than ± 2 °, by beating lock foot anchoring stock after the positioning of bracing members frame Equiblibrium mass distribution.
S2, closing landslide body
The slag dignity of entire new face exposure is closed using pneumatically placed concrete mode;
It is specific: in step S2, concrete marked as C20, thickness of shotcrete 20cm.
S3, advanced tubule pore-creating
Spring line (i.e. excavation contour line) is drawn in new face, the label drilling hole location more than spring line, then drill, it bores Hole direction obliquely, pass through landslide body and enter not disturbed rock mass;It marks and drills at new face (i.e. below spring line) Hole location, and drilling is drilled with into slag body, drilling passes through slag body and enters the not disturbed rock mass on front side of former face;
Further, the drilling horizontal of new face is arranged in step S3, it is horizontal drilling.
Further, boring two rounds, respectively the first row hole drilling and the second gang drill more than spring line in step S3 Hole, wherein the elevation angle of the first row hole drilling is greater than the elevation angle of the second row hole drilling, the depth of the second row hole drilling is greater than the second row hole drilling Depth.
Specific: in step S3, the elevation angle of the first row hole drilling is 20 °, and the elevation angle of the second row hole drilling is 5 °.
It is specific: in step S3, using YT28 pusher leg drill pore-creating, to draw spring line in new face;Drilling The diameter of drill bit is 50mm, and the spacing of the drilling hole location on spring line is 20~30cm, and when drilling utilizes drilling machine generalIt bores Bar bandDrill bit squeezes into projected depth.
S4, ductule production and installation
The front end processing of ductule is tapered and bores injected hole, and the tube wall bit pressure of ductule starches hole, and the tail portion of ductule is pre- Stay the only slurry section not drilled;Ductule is squeezed into or heads into each drilling, ductule tail portion is fixedly connected with support frame;
Specific: in step S4, ductule heads into drilling by hammer driven or drilling machine, and ductule is not deeply disturbed Rock mass 1.5m or more;Ductule is made of the hot rolled seamless steel tube of wall thickness 3.5mm, outer diameter 42mm, the aperture in mud jacking hole Pitch of holes 20cm simultaneously arranges that the length for only starching section is not less than 30cm, and the tail portion of ductule is welded in blossom typeIt puts more energy into hoop; After ductule installation, with high-pressure blast to cleaning in pipe, and aperture and surrounding crack are blocked.
S5, slip casting
Slip casting is carried out to ductule more than spring line, ductule and injecting cement paste become whole, form effectively support top The arch shell of loose rock mass;Slip casting is carried out to the ductule in the drilling of new face, is formed " remaining core soil in advance ";
Specific: in step S5, grouting serous fluid concentration from thin to thick, converts step by step;Accelerator is added in slurries, slip casting is suitable Sequence use is carried out to the sequence for having the location water Duo Shui from bottom to top, from the location of anhydrous few water.
S6, it slags tap
It slags tap and carries out by several times, slag tap first remove the slag body at " remaining core soil in advance " two sides and top every time, then install newly Support frame, then remove intermediate " remaining core soil in advance ".
Specific: in step S6, drilling depth of slagging tap every time is 50cm.
The beneficial effects of the present invention are: the method for processing jacked piles with small section landslide is directed to jacked piles with small section weak broken wall rock Hole section, compared with landslip and can not continue the case where slagging tap suitable for processing face and top, take that " grouting with small pipe is pre- solid The treatment measures of knot+remaining core soil in advance " are reinforced the loose slag body for the body that caves in hole, are carried out to the above slag body of spring line Slip casting makes ductule and injecting cement paste become whole, forms the shell of effectively support top loose rock mass;To new face landslide body Preconsolidation is carried out, the method that remaining core soil in advance is taken in tapping process carries out excavation supporting, and then safely and fast passes through landslide section. The technology of the present invention is simple, strong operability and effective, is particularly suitable for jacked piles with small section weak broken wall rock and seriously caves in section; And cost is relatively low, saves construction investment;Also it can accelerate construction progress safely and fast by landslide section and reduce construction safety wind Danger.
More than spring line bore two rounds, respectively the first row hole drilling and the second row hole drilling, the ductule master of the first row hole drilling The induration that adequate thickness is formed at the top of the body that makes for slip casting preconsolidation to cave in is acted on, the ductule of the second row hole drilling is mainly made With for Auxiliary support top cave in body, and hole push up design hole dig line at play the role of segmentation, to be conducive to excavated section Slag body in range is purged.
Detailed description of the invention
Fig. 1 is the vertical section schematic diagram of the method for present invention processing jacked piles with small section landslide.
Fig. 2 is the cross-sectional view of the method for present invention processing jacked piles with small section landslide.
Components, position and number in figure: support frame 1, new face 2, landslide body 3, former face 4, horizontal drilling 5, First row hole drilling 6, the second row hole drilling 7.
Specific embodiment
The present invention will be further explained below with reference to the attached drawings.
Referring to fig. 1 and fig. 2, in jacked piles with small section weak broken wall rock hole section, landslide body 3 blocks former face 4, and Form new face 2, the method that the present invention handles jacked piles with small section landslide, comprising the following steps:
S1, installation 1 Tunnel Reinforcement of support frame
Support frame 1 is used to reinforce the tunnel close to landslide position, and provides safe construction location.In new 2 slag of face Body rear has the position of execution conditions, first removes footing dross, then be supported 1 supporting construction of frame.1 bracing members of support frame Frame, the arch springing of bracing members frame has certain buried depth, and falls on firm base.The supporting surface and tunnel centre line of bracing members frame Vertically, within ± 5cm, gradient is less than ± 2 ° for deviation control up and down, and lock foot anchoring stock, equilibrium point are played after the positioning of bracing members frame Cloth.In addition, support frame 1 is it is also an option that steel grating.
S2, closing landslide body 3
Because landslide 3 slag body of body is loose, direct slip casting will appear slurries and lose along slag body surface surface current, the feelings such as internal slurries leakiness Condition, therefore closing landslide body 3 is needed before slip casting.Spray C20 concrete can be used to seal the slag dignity of the entire new exposure of face 2 It closes, thickness of shotcrete 20cm, so that it is guaranteed that subsequent preconsolidation slip casting effect.
S3, advanced tubule pore-creating
Excavation contour line, i.e. spring line are drawn in new face 2, the label drilling hole location more than spring line, then drill, it bores Hole direction obliquely, pass through landslide body 3 and enter not disturbed rock mass;Drilling hole location is marked in new face 2, i.e., in arch camber The hole location of label drilling below line, and drilling is drilled with into slag body, drilling passes through slag body and enters not disturbed for former 4 front side of face Dynamic rock mass.For example, selecting the pore-creating of YT28 pusher leg drill, initial survey team is drawn according to design size in new face 2 Spring line out, and drilling hole location is made by the spacing of wells of design more than spring line, the spacing of wells is generally 20~30cm, and Mark the boring direction of each drilling hole location.When drilling, using common drilling rod, drill bit uses diameter of phi 50mm drill bit.Drilling is answered Strictly carried out by the hole location made, it is ensured that bore position it is accurate;Drilling rod direction and extrapolation angle are observed in drilling process in time, It should give adjustment when finding direction and larger extrapolation angular displacement.To guarantee that drilling is completed by design requirement, ductule is enable to rise To expected supporting effect.
In view of drilling machine operating condition and actual pore-forming difficulty, and it is possible that the problem of, first is that landslide section slag body Loosely it is not easy pore-forming;If second is that crept into using hand air drill directly band seamless steel pipe, the limitation of hand air drill operating condition be difficult to meet 4m with On drilling depth.Based on the above two o'clock, in such cases, can be incited somebody to action first with drilling machineDrilling rod bandDrill bit is beaten Enter projected depth, then willDuctule set drilling rod is installed to projected depth.
The purpose of the drilling of new face 2 is grouting reinforcement excavation contour line slag body below, i.e., consolidation spring line with Under slag body, therefore the drilling best level arrangement of new face 2 is horizontal drilling 5.
The purpose of drilling more than spring line is that ductule and injecting cement paste is made to become entirety, formation effectively support top The shell of loose rock mass.For example, slag body more than spring line bores two rounds, respectively the first row hole drilling 6 and the second row hole drilling 7, Wherein the elevation angle of the first row hole drilling 6 is greater than the elevation angle of the second row hole drilling 7, and the depth of the second row hole drilling 7 is greater than the second row hole drilling 7 Depth.Specifically, the elevation angle of the first row hole drilling 6 is 20 °, the elevation angle of the second row hole drilling 7 is 5 °.According to sin20 °/sin5 °= 3.92 calculated result, it can be seen that elevation angle size, which has consolidated thickness, to be significantly affected.In view of the operability of construction And Auxiliary support of more than spring line the second row hole drilling 7 after slip casting acts on, it is more than spring line that the depth of the first row hole drilling 6 is big In the depth of the second row hole drilling 7, so that ductule has sufficient length to go deep into not disturbed front rock mass, it is enough to provide Bearing capacity.
S4, ductule production and installation
The front end processing of ductule is tapered and bores injected hole, and the tube wall bit pressure of ductule starches hole, and the tail portion of ductule is pre- Stay the only slurry section not drilled;Ductule is squeezed into or heads into each drilling, ductule tail portion is fixedly connected with support frame 1.For example, small Conduit is made of the hot rolled seamless steel tube of wall thickness 3.5mm, outer diameter 42mm.
Injected hole is bored in ductule front, and tail portion is burn-onIt puts more energy into hoop, tube wall surrounding hole diameterMud jacking Hole, pitch of holes 20cm arrange that front end processing is tapered, one section of work that do not drill that tail portion stays length to be not less than 30cm in blossom type Until starch section.The processing of ductule is completed in steel bar meter field, and length determines according to field condition, it is desirable that undisturbed rock mass 1.5m More than.Ductule is headed by hammer driven or drilling machine, and ductule tail portion and the weldering of bracing members frame connect.After ductule installation, in time The sandstone in pipe is blown clean with high-pressure blast, and blocks aperture and surrounding crack with plastic materials such as flax silk or Anchor Agents.
S5, slip casting
Slip casting is mainly divided to two positions to be implemented, first is that it is more than spring line ductule carry out slip casting, ductule with Injecting cement paste becomes whole, for the purpose of consolidating cavern top, generate camber effect, forms the arch of effectively support top loose rock mass Shape shell.Second is that carrying out slip casting to the ductule in the drilling of new face 2, formed " remaining core soil in advance ", " remaining core soil in advance " Support is provided for top landslide body, is conducive to subsequent hole excavation construction operation.Slip casting should refer to consolidation grouting job specfication, slip casting Concentration of slurry from thin to thick, converts step by step.
(1) cement slurry
Grouting with small pipe uses cement grout, and just be set to 0.5:1,1:1,2:1 (weight ratio) three compares grade to grout coordinate ratio. Accelerator is added in slurries, tentatively drafts 5% that volume is cement consumption.Grouting liquid is played to be selected than grade according to field test.
(2) grouting pressure
The grouting pressure tentatively drafted is 0.5Mpa, and when construction should be adjusted according to practical slip casting situation.
(3) slurries are converted than grade
Grouting serous fluid should refer to consolidation grouting job specfication than grade and require to convert step by step from thin to thick.During slip casting in case of Grouting pressure does not rise always, the nondecreasing situation of flow rate of grouting, Ying Gaiwei underflow injection, or take " interval slip casting " mode into Row construction.
(4) slip casting ending standard
Under the pressure of 1.0Mpa, when injection rate is not more than 0.4L/min, continue that 5min is perfused, grouting can terminate.
(5) grouting sequence
Grouting sequence is carried out from the location of anhydrous few water to having from the more water of water using from bottom to top.
S6, it slags tap
It slags tap after slurries reach some strength, slags tap and carry out by several times, such as drilling depth of slagging tap every time is 50cm.Every time First mechanical engagement of slagging tap manually removes " remaining core soil in advance " two sides and then the slag body at top is installed so as to the installation of bracing members New support frame after support frame is installed, then removes intermediate " remaining core soil in advance ".

Claims (10)

1. the method for handling jacked piles with small section landslide, it is characterised in that: the following steps are included:
S1, installation support frame (1) Tunnel Reinforcement
Have the position of execution conditions at new face (2) slag body rear, first remove footing dross, then is supported frame (1) branch Shield construction;
S2, closing landslide body (3)
The slag dignity of entirely new face (2) exposure is closed using pneumatically placed concrete mode;
S3, advanced tubule pore-creating
Draw spring line in new face (2), label drilling hole location, then drills more than spring line, boring direction obliquely, wear It more caves in body (3) and enters not disturbed rock mass;
Drilling hole location is marked in new face (2), and is drilled with drilling into slag body, drilling passes through slag body and enters former face (4) the not disturbed rock mass on front side of;
S4, ductule production and installation
The front end processing of ductule is tapered and bores injected hole, and the tube wall bit pressure of ductule starches hole, and the tail portion of ductule is reserved not The only slurry section of drilling;Ductule is squeezed into or heads into each drilling, ductule tail portion is fixedly connected with support frame (1);
S5, slip casting
Slip casting is carried out to ductule more than spring line, ductule and injecting cement paste become whole, and it is loose to form effectively support top The arch shell of rock mass;Slip casting is carried out to the ductule in the drilling of new face (2), is formed " remaining core soil in advance ";
S6, it slags tap
It slags tap and carries out by several times, slag tap first remove the slag body at " remaining core soil in advance " two sides and top every time, then new support is installed Frame, then remove intermediate " remaining core soil in advance ".
2. the method for processing jacked piles with small section landslide as described in claim 1, it is characterised in that: in step S1, support frame (1) For bracing members frame or or steel grating, the supporting surface of bracing members frame and steel grating is vertical with tunnel centre line, up and down deviation ± Within 5cm, gradient be less than ± 2 °, bracing members frame positioning after by breaking lock foot anchoring stock equiblibrium mass distribution.
3. the method for processing jacked piles with small section landslide as described in claim 1, it is characterised in that: in step S2, concrete Marked as C20, thickness of shotcrete 20cm.
4. the method for processing jacked piles with small section landslide as described in claim 1, it is characterised in that: in step S3, new face (2) drilling horizontal arrangement, for horizontal drilling (5).
5. the method for the processing jacked piles with small section landslide as described in Claims 1 to 4 any claim, it is characterised in that: step In rapid S3, two rounds, respectively the first row hole drilling (6) and the second row hole drilling (7) are bored more than spring line, wherein the first row hole drilling (6) the elevation angle is greater than the elevation angle of the second row hole drilling (7), and the depth of the second row hole drilling (7) is greater than the depth of the second row hole drilling (7).
6. the method for processing jacked piles with small section landslide as claimed in claim 4, it is characterised in that: in step S3, the first gang drill The elevation angle in hole (6) is 20 °, and the elevation angle of the second row hole drilling (7) is 5 °.
7. the method for processing jacked piles with small section landslide as claimed in claim 6, it is characterised in that: in step S3, using YT28 Pusher leg drill pore-creating draws spring line in new face (2);The diameter of the drill bit of drilling is 50mm, on excavation contour line The spacing of drilling hole location be 20~30cm, will using drilling machine when drillingDrilling rod bandIt is deep that drill bit squeezes into design Degree.
8. the method for processing jacked piles with small section landslide as claimed in claim 5, it is characterised in that: in step S4, ductule is logical It crosses hammer driven or drilling machine heads into drilling, ductule gos deep into not disturbed rock mass 1.5m or more;Ductule by wall thickness 3.5mm, The hot rolled seamless steel tube of outer diameter 42mm is made, the aperture in mud jacking holePitch of holes 20cm is simultaneously arranged in blossom type, only starches section Length be not less than 30cm, the tail portion of ductule is weldedIt puts more energy into hoop;After ductule installation, carried out with high-pressure blast in pipe It cleans, and blocks aperture and surrounding crack.
9. the method for processing jacked piles with small section landslide as claimed in claim 5, it is characterised in that: in step S5, grouting serous fluid Concentration from thin to thick, converts step by step;Add accelerator in slurries, grouting sequence using from bottom to top, from the location of anhydrous few water The sequence in the location Xiang Youshui Duo Shui carries out.
10. the method for processing jacked piles with small section landslide as claimed in claim 5, it is characterised in that: in step S6, slag tap every time Drilling depth is 50cm.
CN201910768423.0A 2019-08-20 2019-08-20 The method for handling jacked piles with small section landslide Pending CN110424971A (en)

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