CN107542469A - A kind of underground mould bag stake method for protecting support - Google Patents
A kind of underground mould bag stake method for protecting support Download PDFInfo
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- CN107542469A CN107542469A CN201710196485.XA CN201710196485A CN107542469A CN 107542469 A CN107542469 A CN 107542469A CN 201710196485 A CN201710196485 A CN 201710196485A CN 107542469 A CN107542469 A CN 107542469A
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- mould bag
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- grouting pipe
- slurry outlet
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Abstract
The invention discloses a kind of underground mould bag stake method for protecting support, comprise the following steps：1) rig pore-forming is utilized, forms mould pocket；Grouting Pipe is set in mould pocket, the Grouting Pipe sets slurry outlet；Separator is provided with the Grouting Pipe, the posterior segment of the Grouting Pipe sets mould bag, and Grouting Pipe leads to mould bag provided with an at least slurry outlet；It is drainpipe between mould bag rear end and the outer wall of Grouting Pipe；Grouting Pipe leading portion is surrounded by segmentation mould bag；2) the first grouting equipment is used first, Grouting Pipe is injected into the first grouting, to mould bag saturation；Then the second grouting equipment is used, Grouting Pipe is injected into the second grouting, second grouting flows out Grouting Pipe from preceding slurry outlet；3) slip casting alternately is carried out to the stake of I sequence mould bags first to mould pocket slip casting, treats that I sequence mould bags fully expand and reach some strength and then to II sequence mould bag stake slip castings, extremely form mould bag stake supporting wall structure.The present invention has the advantages that sedimentation is excavated in good stress condition, sealing effect, effectively control.
Description
Technical field
The present invention relates to a kind of underground mould bag stake method for protecting support, more particularly to one kind between ink feed conduits and inkjet mouth
Underground mould bag stake method for protecting support provided with air indwelling chamber, air is set more particularly to one kind between jet orifice and inkjet mouth
The underground mould bag stake method for protecting support of indwelling chamber.
Background technology
In Support System in Soft Rock Tunnels digging process, in order to prevent the addresses such as Tunnel Landslide water burst, wall rock loosening, ground settlement
Disaster, need to carry out pre-reinforcement construction before excavation.The more common and ripe engineering method of weak surrounding rock pre support construction at present has
Pipe shed method, pipe-roof method construction, small-lead-tube advanced slip-casting method, horizontal jet grouting or paddling process, shield method, freezing etc..Its middle pipe canopy
It is that Support System in Soft Rock Tunnels excavates the most frequently used pre support reinforcement technique that method is combined with grouting with small pipe method.
Referring to Fig. 1, piped shed conslruction method is as follows：The arch area that pipe roof construction is intended excavating first with rig in tunnel
According to design aperture, spacing and deep drilling, embedded steel pipe (tube wall preboring perforation) simultaneously passes through the grouting and reinforcing soil body and raising
The rigidity of steel pipe so that intend tunneling arch and be pre-formed advanced pre support system.Because pipe canopy combining structure has in itself
There is shear behavior, can effectively carry the load of top relaxation Soft Soil Layer, maintain stable face, control stratum deformation, pre- avalanche prevention
Collapse roof fall accident.But due to poor sealing performance, generally require to be applied in combination with small-lead-tube advanced slip-casting reinforcement technique.
The shortcomings that pipe roof construction method：Pile body self-strength is poor, poor to surrounding rock consolidation effect, and water-stagnating effect is poor, most of feelings
Condition needs to coordinate per-fore pouring liquid with small pipe to reinforce but adds the disturbance to country rock.
Per-fore pouring liquid with small pipe is reinforced, it is necessary to be used cooperatively with steel arch-shelf.Will be small according to certain angle around working face
Conduit, which is beaten and (bored, pressure), to be entered in stratum, slurries is permeated by ductule using grouting pump, is diffused into formation void, crack or soft
In weak stratum, improve the physical and mechanical properties of the soil body to a certain extent, play certain sealing and improve the carrying of country rock
The effect of power.But there is the shortcomings of slip casting effect is poor, and reinforcing scope is small.
The content of the invention
It is above-mentioned present in prior art to solve it is an object of the invention to provide a kind of underground mould bag stake method for protecting support
Problem.
Technical scheme provided by the invention is as follows：
A kind of underground mould bag stake method for protecting support, comprises the following steps：
1) rig is utilized, along tunneling direction pore-forming, to form mould pocket (31) in tunnel；Grouting Pipe is set in mould pocket (31)
(32), the Grouting Pipe (32) sets slurry outlet (35)；Grouting Pipe (32) Inner Front End is provided with preceding separator (38), after middle part is provided with
Separator (36), the posterior segment of the Grouting Pipe (32) set mould bag (34)；Between the outer wall of mould bag (34) rear end and Grouting Pipe (32)
For drainpipe (33)；Grouting Pipe (32) leading portion is surrounded by segmentation mould bag (37)；Grouting Pipe (32) leads to mould provided with an at least slurry outlet
Bag (34), a slurry outlet lead to segmentation mould bag (37), and a slurry outlet leads between mould bag (34) and segmentation mould bag (37)
Gap；Separator (36) is located at towards the slurry outlet of mould bag (34) and towards between mould bag (34) and segmentation mould bag (37) afterwards
Between the slurry outlet of gap；
2) the first grouting equipment is used first, Grouting Pipe (32) is injected into the first grouting, and first grouting is from slurry outlet stream
Enter mould bag (34), to mould bag (34) saturation；
Then the second grouting equipment is used, separator (36) is destroyed, Grouting Pipe (32) is injected into the second grouting, this second
The gap being segmented between mould bag (37), and mould bag (34) and segmentation mould bag (37) is injected in grouting from slurry outlet；
3) alternately is carried out by slip casting to I sequences (1,3,5,7 ...) mould bag stake first, treats that I sequence mould bags are fully swollen for mould pocket slip casting
It is swollen and reach some strength and then to the bag stake slip casting of II sequences (2,4,6,8 ...) mould, to forming mould bag stake supporting wall structure.
The described mould bag stake of I sequences and II sequence mould bag stakes, respectively by odd number of arrayed position and the mould bag of even number arrangement position
Stake.
In the present invention, aperture is chosen according to Theoretical Design, and boring direction is outside along driving tunnel contour line is intended
Into certain inclination angle.Preferably, can be 20-40 degree.
In the present invention, drill hole inclination control within certain limit (preferably, less than 30 degree), drilling is divided to two sequences
Construction (is constructed) every hole.After drilling construction is completed, sediment in flushing hole so that stake holes meets that the decentralization of mould bag requires.
In the preferred embodiment, before the side of the Grouting Pipe (32) in after set a slurry outlet respectively, be respectively
Preceding slurry outlet (353), middle slurry outlet (352) and rear slurry outlet (351)；Between preceding slurry outlet (353) and middle slurry outlet (352)
Provided with separator (36), the posterior segment of the Grouting Pipe (32) sets mould bag (34), the mould bag (34) cladding in slurry outlet (352) and after
Slurry outlet (353).
In the preferred embodiment, divider disruption can be used raising grouting pressure or mechanicalness to break by step 2)
It is bad.Described mechanical destruction, it can use and such as puncture mode.
In the preferred embodiment, after step 2) gap is full of, Grouting Pipe is also filled into grouting.
In the preferred embodiment, grouting order and grouting way.The stake of mould bag and controlling cement grout are adopted
Constructed with a point sequence.After mould bag reaches certain degree of saturation, small grouting pump is changed according to full situation and carries out supplementary irrigation construction.
In the preferred embodiment, grouting control and ending standard.A. during mould bag stake slip casting pressure up to 0.5~
Do not enter slurry after 1.5MPa, terminate after stablizing 5 minutes, the control of the rate of climb to grout absorption and pressure, slip casting are paid attention to during mud jacking
Speed should be controlled in 30~50L/min, it is ensured that mould bag has the filter water discharge time of abundance, and small pump is changed after reaching certain degree of saturation
Supplementary irrigation construction is carried out, supplementary irrigation injection speed is controlled in 10L~15L/min；Injection rate is typically averaged according to mould bag volume per linear meter(lin.m.)
200~300kg of cement mixed weight.B. controlling cement grout enters to starch pressure up to maximum under the premise of ensuring not lift, and enters slurry
Rate drops to after 2L/min to stablize and can terminate within 5 minutes to be in the milk, actually the closely knit situation regulation of the amount of pouring into manufacture bases geology, to reach
For the purpose of soil layer consolidation effect.
Advantages of the present invention is as follows：
1. good stress condition.Underground mould bag stake arching wall construction equivalent to having built one in advance in Soft Soil Layer
Individual reinforced concrete supporting arch, the compression strength of mould bag cement calculus can reach more than 40MPa, have very high bearing capacity and resist
Damage capability, it can ensure that the safety of tunnel excavation in Soft Soil Layer.
2. good sealing effect.Underground mould bag stake arching wall protection structure itself has good sealing effect, and
The effect (the c values and φ values that improve the soil body) of compacted compacting and draining hardening is served to the Soft Soil Layer of surrounding, with mould bag stake
Arch ring supporting construction forms overall shared upper load and sealing, effectively raises integrated carrying ability and reduces seepage
Water risk.
3. effectively sedimentation is excavated in control.Due to can effectively solve leakage problem in work progress, so being avoided that underground
Problem is settled and collapsed caused by water level decreasing, it is ensured that construction safety.Underground mould bag stake arching wall total bearing capacity is strong,
The relaxation deformation on stratum can be greatly improved, ensures that sedimentation and deformation does not occur in digging process.
4. effective console dynamic deformation.This technology is smaller to soil layer disturbing influence around by brand-new technology,
Can effective console dynamic deformation, do not interfere with the safety of upper building, do not influence the safe operation of top railway.
5. it is convenient to construct.This new technology uses small, dedicated equipment, quick construction, place strong applicability.
6. multiple action.Reduce and repeat disturbance of the drilling to country rock, once construct with regard to supporting, reinforcing, sealing can be played
Multiple effect.
Brief description of the drawings
Fig. 1 is piped shed conslruction schematic diagram in the prior art；
1 '-steel grating 2 '-ductule arrow is tunneling direction
Fig. 2 mould bag stake holes bit plans of the present invention；
Fig. 3 is mould bag stake plane of arrangement figure of the present invention；
Fig. 4 is mould bag colligation schematic diagram of the present invention；
Fig. 5 is mould bag stake grouting sequence schematic diagram of the present invention；
Fig. 6 is I sequences mould bag stake slip casting of the present invention；
Fig. 7 is that II sequence mould bag stakes slip casting forms braced wall；
Fig. 8 is underground mould bag stake supporting wall structure schematic diagram.
Fig. 9 is mould bag stake braced wall extrusion forming design sketch；
In figure
1- tunnels
11- intends excavation contour line 12- faces
2- steel arch-shelfs
3- mould bag pile elements
31- mould pocket 32- Grouting Pipe 33- drainpipe 34- mould bags
The slurry outlets of the 3rd slurry outlet 354- of 35- slurry outlets 351- the first slurry outlet 352- the second slurry outlet 353- the 4th
Separator 37- is segmented separator before mould bag 38- after 36-
Embodiment
In describing below, using the bottom hole direction of drilling as front end, aperture direction is rear end.
Referring to Fig. 3 and Fig. 4, the structure of mould bag pile element 3 is as follows：It includes mould pocket 31, and slip casting is provided with mould pocket 31
Pipe 32, the side of the Grouting Pipe 32 set four slurry outlets 35 from rear to preceding, respectively are the first slurry outlet 351, the second slurry outlet
352nd, the 3rd slurry outlet 353 and the 4th slurry outlet 354.Wherein the 4th slurry outlet 354 is at Grouting Pipe front end exit.In slip casting
Pipe front end exit is provided with preceding separator 38, and Grouting Pipe is in the portion perimeter cladding segmentation mould bag 37 provided with the 4th slurry outlet 354；
For Grouting Pipe in posterior segment cladding mould bag 34, the mould bag covers the first slurry outlet 351 and the second slurry outlet 352, and second
Rear separator 36 is set between the slurry outlet 353 of slurry outlet 352 and the 3rd.
It is drainpipe 33 between the outer wall of the rear end of mould bag 34 and Grouting Pipe 32.
Pile hole construction
Referring to Fig. 2 and Fig. 3, using rig pore-forming, mould pocket 31 is formed, aperture is chosen (with straight according to Theoretical Design
Exemplified by the 500mm of footpath), boring direction is along plan driving tunnel contour line outwards into certain inclination angle.Preferably, can be 20-40
Degree.
Drill hole inclination is controlled within certain limit (preferably, less than 30 degree), and drilling is divided to the construction of two sequences (to be applied every hole
Work).After drilling construction is completed, sediment in flushing hole so that stake holes meets that the decentralization of mould bag requires.
2. the colligation of mould bag and the decentralization of mould bag
(1) Mo Dai pile center steel pipe (Grouting Pipe 32) selects diameter 50mm, and wall thickness 4mm seamless steel pipes, mould bag 34 is from straight
Footpath 500mm straight barrel types geotextiles (nominal fracture strength is 50kN/m).Center steel pipe plays slip casting passage and mould bag is oriented to, supported
Effect, according to stake deeply design set mould bag colligation length.
(2) after pore-forming, verification hole position, hole depth etc., after being satisfied by design requirement, start to bury and put mould bag steel pipe.Mould bag stake
Process and bury to put and be responsible for by special messenger, mould bag stake will avoid winding or scratching in decentralization process.Such as because of collapse hole or bottom hole deposit,
Bury and put again after palpus borehole cleaning.
Referring to Fig. 5 to Fig. 7, construction method of the present invention is as follows：
(1) grouting material and grouting equipment.Mould bag stake grouting material is intended selecting P.O42.5 Portland cement slurries,
Controlling cement grout is P.O42.5 Portland cements and Chemical Control liquid using material.Cement grout is formulated as water ash
Than 0.8:1, in Chemical Control liquid addition content and opportunity window depending on boosting situation and grout absorption change, generally cement grout
8~10%.For grouting equipment using 3SNS grouting pumps and the self-control small pump of hydraulic pressure, pulping equipment is self-control twin-tub mixer.3SNS is filled
Stock pump pours into cement grout, and the self-control small pump of hydraulic pressure pours into Chemical Control liquid.
(2) grouting order and grouting way.
As shown in Fig. 5 to Fig. 8, mould bag stake grouting material is inputted by Grouting Pipe 32 using grouting pump first, due to rear separation
The stop of device 36, mould bag stake grouting material enter mould bag 34 from the first slurry outlet 351, the second slurry outlet 352.Mould bag 34 reaches one
After determining degree of saturation, small grouting pump is changed according to full situation and carries out supplementary irrigation construction.After the completion of mould bag stake mud jacking, pipe is washed in punching,
Being controlled property cement grout again, the strict relation for controlling grouting amount and pressure.When pressure reaches to a certain degree, rear separator
36 is destroyed, and cement grout enters segmentation mould bag 37 from the 4th slurry outlet 354, while enters mould bag 34 from the 3rd slurry outlet 353
Gap and outside between segmentation mould bag 37.
Finally, Grouting Pipe 32 is full of.
(3) pressure is set.Pressure is influenceed by soil layer geology, and pressure change can only qualitatively judge mould bag in grouting pressure in hole
Whether opened under effect, it is impossible to which quantitative analysis mould bag deploys and turgor.Each section of grouting setting pressure such as table 1：
Each section of grouting setup pressure value of table 1
4) grouting control and ending standard.A. pressure up to slurry is not entered after 0.5~1.5MPa, stablizes 5 points during mould bag stake slip casting
Terminate after clock, the control of the rate of climb to grout absorption and pressure is paid attention to during mud jacking, injection speed should be controlled in 30~50L/
Min, it is ensured that mould bag has the filter water discharge time of abundance, and small pump progress supplementary irrigation construction, supplementary irrigation note are changed after reaching certain degree of saturation
Speed control is starched in 10L~15L/min；Injection rate according to mould bag volume typically per linear meter(lin.m.) average cement mixed weight 200~
300kg.B. controlling cement grout enters to starch pressure up to maximum under the premise of ensuring not lift, and enters after slurry rate drops to 2L/min
Stablizing can terminate to be in the milk for 5 minutes, actually the closely knit situation regulation of the amount of pouring into manufacture bases geology, to reach soil layer consolidation effect as mesh
's.
(5) mould bag stake supporting wall structure.
Slip casting (Fig. 7) is carried out to I sequences (1,3,5,7 ...) mould bag stake first, treats that I sequence mould bags fully expand and reach certain strong
Spend and then to II sequences (2,4,6,8 ...) mould bag stake slip casting (Fig. 8).Between mould bag stake, between the stake of mould bag and surrounding soil mutually
Extruding, the cement calculus under high pressure effect in mould bag can reach very high intensity (the average 40MPa of compression strength).In addition,
It is overall that each mould bag stake forms continuous braced wall under self extrusion and controlling slip casting effect, the interior friction man of the soil body and viscous
Poly- power also has significant improvement, on the whole with high intensity, high stability, strong sealing the characteristics of.
The specific embodiment of the present invention is above are only, but the design concept of the present invention is not limited thereto, all utilizations
This design carries out the change of unsubstantiality to the present invention, all should belong to the behavior for invading the scope of the present invention.
Claims (8)
1. a kind of underground mould bag stake method for protecting support, comprises the following steps：
1) rig is utilized, along tunneling direction pore-forming, to form mould pocket (31) in tunnel；Grouting Pipe (32) is set in mould pocket (31), should
Grouting Pipe (32) sets slurry outlet (35)；Grouting Pipe (32) Inner Front End is provided with preceding separator (38), and middle part is provided with rear separator
(36), the posterior segment of the Grouting Pipe (32) sets mould bag (34)；It is draining between the outer wall of mould bag (34) rear end and Grouting Pipe (32)
Manage (33)；Grouting Pipe (32) leading portion is surrounded by segmentation mould bag (37)；Grouting Pipe (32) leads to mould bag (34) provided with an at least slurry outlet,
One slurry outlet leads to segmentation mould bag (37), and a slurry outlet leads to mould bag (34) and the gap being segmented between mould bag (37)；Afterwards
Separator (36) is located at towards the slurry outlet of mould bag (34) and going out towards the gap between mould bag (34) and segmentation mould bag (37)
Between slurry hole；
2) the first grouting equipment is used first, Grouting Pipe (32) is injected into the first grouting, and first grouting flows into mould from slurry outlet
Bag (34), to mould bag (34) saturation；
Then the second grouting equipment is used, separator (36) is destroyed, Grouting Pipe (32) is injected into the second grouting, second grouting
From the gap that slurry outlet is injected between segmentation mould bag (37), and mould bag (34) and segmentation mould bag (37)；
3) slip casting alternately is carried out to the stake of I sequence mould bags first to mould pocket slip casting, treats that I sequence mould bags fully expand and reach certain strong
Spend and then to II sequence mould bag stake slip castings, to formation mould bag stake supporting wall structure.
A kind of 2. underground mould bag stake method for protecting support as claimed in claim 1, it is characterised in that：Boring direction tunnels tunnel along plan
For road contour line outwards into certain inclination angle, described inclination angle is 20-40 degree.
A kind of 3. underground mould bag stake method for protecting support as claimed in claim 1, it is characterised in that：Drill hole inclination control is less than 30
Degree, drilling are divided to two sequences to construct.
A kind of 4. underground mould bag stake method for protecting support as claimed in claim 1, it is characterised in that：Before the side of the Grouting Pipe (32)
In after set a slurry outlet respectively, slurry outlet (353) before being respectively, middle slurry outlet (352) and rear slurry outlet (351)；In preceding pulp
Separator (36) is provided between hole (353) and middle slurry outlet (352), the posterior segment of the Grouting Pipe (32) sets mould bag (34), the mould
Slurry outlet (352) and rear slurry outlet (353) in bag (34) cladding.
A kind of 5. underground mould bag stake method for protecting support as claimed in claim 1, it is characterised in that：Grouting order and grouting way.
The stake of mould bag and controlling cement grout are constructed using a point sequence.After mould bag reaches certain degree of saturation, changed according to full situation
Small grouting pump carries out supplementary irrigation construction.
A kind of 6. underground mould bag stake method for protecting support as claimed in claim 1, it is characterised in that：Step 2) adopts divider disruption
With raising grouting pressure or mechanical destruction.
A kind of 7. underground mould bag stake method for protecting support as claimed in claim 1, it is characterised in that：After step 2) gap is full of,
Grouting Pipe is also filled into grouting.
A kind of 8. underground mould bag stake method for protecting support as claimed in claim 1, it is characterised in that：Grouting control and ending standard:
A. pressure up to slurry is not entered after 0.5~1.5MPa, terminates after stablizing 5 minutes during mould bag stake slip casting, and control is to entering slurry during mud jacking
The rate of climb of amount and pressure, injection speed should be controlled in 30~50L/min, it is ensured that mould bag has the filter water discharge time of abundance, reaches
Small pump is changed after to certain degree of saturation and carries out supplementary irrigation construction, supplementary irrigation injection speed is controlled in 10L~15L/min；Injection rate root
According to mould bag volume typically 200~300kg of every average cement mixed weight of linear meter(lin.m.)；
B. controlling cement grout enters to starch pressure up to maximum under the premise of ensuring not lift, and enters slurry rate and drops to after 2L/min surely
It can terminate to be in the milk within fixed 5 minutes, actually the closely knit situation regulation of the amount of pouring into manufacture bases geology, to reach soil layer consolidation effect as mesh
's.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710196485.XA CN107542469A (en) | 2017-03-29 | 2017-03-29 | A kind of underground mould bag stake method for protecting support |
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| CN201710196485.XA CN107542469A (en) | 2017-03-29 | 2017-03-29 | A kind of underground mould bag stake method for protecting support |
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| CN109653753A (en) * | 2018-12-07 | 2019-04-19 | 山东大学 | A kind of shield urgency curve driving auxiliary turning construction method |
| CN113833493A (en) * | 2021-09-29 | 2021-12-24 | 铁科院(深圳)研究设计院有限公司 | Ground layer consolidates uses utricule pipe canopy |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109026015A (en) * | 2018-06-27 | 2018-12-18 | 山东大学 | A kind of pre-grouting control method suitable for urban subway tunnel |
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| CN109653753A (en) * | 2018-12-07 | 2019-04-19 | 山东大学 | A kind of shield urgency curve driving auxiliary turning construction method |
| CN109653753B (en) * | 2018-12-07 | 2019-11-15 | 山东大学 | A kind of shield urgency curve driving auxiliary turning construction method |
| CN113833493A (en) * | 2021-09-29 | 2021-12-24 | 铁科院(深圳)研究设计院有限公司 | Ground layer consolidates uses utricule pipe canopy |
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Application publication date: 20180105 |
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