CN208456648U - A kind of soft-rock tunnel full length fastening supporting construction - Google Patents
A kind of soft-rock tunnel full length fastening supporting construction Download PDFInfo
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- CN208456648U CN208456648U CN201821062581.1U CN201821062581U CN208456648U CN 208456648 U CN208456648 U CN 208456648U CN 201821062581 U CN201821062581 U CN 201821062581U CN 208456648 U CN208456648 U CN 208456648U
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Abstract
The utility model provides a kind of soft-rock tunnel full length fastening supporting construction, supporting construction is mainly by band steel pipe support, anchoring piece and Yieldable steel support composition, steel pipe support is arranged in soft-rock tunnel bottom, the hole of fixing anchor bar and anchor cable is provided on steel pipe support, metal mesh carries out linked network to anchor pole and anchor cable part outstanding and fixes, again to gunite concrete spray-up on the outside of metal mesh, Yieldable steel support compatible with tunnel sectional dimension is finally laid on the outside of metal mesh, the lasting propulsion step-by-step arrangement Yieldable steel support of working face, it is swollen that the strong bottom in advanced stress concentration region can be solved very well, the soft-rock tunnel total bolt support structure and the unmatched phenomenon of parameter of large deformation, supporting effect is promoted simultaneously, it reduces and loses anchor rate, the safety of underground work personnel is substantially improved.
Description
Technical field
The utility model belongs to coal mining technology field, and in particular to a kind of soft-rock tunnel full length fastening supporting construction and
Its construction method.
Background technique
In mine working development engineering, tunnel not only will receive the effect of original stress field, but also also suffers from and adopt
The influence of various concentrated stresses is formed by during coal, wherein being located at the tunnel in front of stope coal wall, due to work
The advanced stress concentration region of the propulsion in face constantly moves forward, this, which allows for this tunnel, need to undergo static pressure-dynamic pressure-release three phases,
Repeatedly variation also accordingly occurs for corresponding surrounding rock displacement, pressure, and transformation period is very brief, variation degree is violent.At this point, anchor pole/
The coordinative role of anchor cable and country rock is just particularly important, and otherwise anchor bar/anchor cable stress raisers are easily pulled off, and are worked as
When roadway support structure and parameter are not suitable with, tunnel, will be so that supporting and maintenance cost by excessive surrounding rock displacement and pressure
It is higher, and it is difficult to ensure safe handling.
Again due to after common end anchor support pattern anchor cable/anchor pole fracture failure due to huge impact energy, breaking portion
Anchor cable/anchor pole moment goes out speed quickly, and to approach, underground work personnel herein easily constitute security threat.In addition, existing
Supporting effect about total bolt support technology is also less desirable, especially the supporting of overall length anchor cable, and it is higher to lose anchor rate.
In addition, filling Anchor Agent after overall length anchor cable jewel hole in work progress at the scene, then anchor cable is recycled to be stirred,
Anchor cable itself is extremely difficult when stirring to stir Anchor Agent sufficiently, or in the state being fixed up, since time control is bad, Jin Erzao
At mistake anchor；Bottom distension is always to be difficult to the thorny problem eradicated during roadway support simultaneously, and common measure of acting as a planted agent can not be from
Problem above is fundamentally solved, reprocesses throughout the year and takes time and effort consumption wealth.
Accordingly, it is desirable to provide a kind of be directed to the insufficient improved technology scheme of the above-mentioned prior art.
Utility model content
The purpose of this utility model is to provide a kind of soft-rock tunnel full length fastening supporting construction and its construction methods, so that
It solves the strong bottom distension in advanced stress concentration region, the soft-rock tunnel total bolt support structure of large deformation and parameter less to mismatch, supporting effect
Difference loses anchor rate height, easily causes security risk, and maintenance time length, problem at high cost to underground work personnel.
To achieve the goals above, the utility model provides the following technical solutions:
A kind of soft-rock tunnel full length fastening supporting construction, which is characterized in that the supporting construction includes:
Steel pipe support, the steel pipe support are set to soft-rock tunnel bottom, and the steel pipe support is U-shaped structure, U-shaped structure
The steel pipe support include the vertical portion of the vertical steel pipe support in left and right ends and the curved portion of bent intermediate steel pipe support, it is described
Steel pipe support is equipped with multiple holes convenient for anchoring piece insertion, is perfused with concrete in the steel pipe support；
Anchoring piece, the anchoring piece include multiple anchor cables and anchor pole, and multiple anchor cables and anchor pole are distributed in soft-rock tunnel
Surrounding palisades in, the anchor cable and anchor pole pass through the country rock where the periphery of the insertion of the hole on steel pipe support tunnel
It is interior, for carrying out supporting to soft-rock tunnel；
Metal mesh, the metal mesh are fixed by the anchoring piece exposed parts, are laid on soft-rock tunnel inner surface,
What the metal mesh was covered on soft-rock tunnel two helps and arch；
Concrete spray coating, the concrete spray coating are covered in the metal mesh outer layer and soft-rock tunnel bottom, for soft
Rock gangway road is reinforced；
Yieldable steel support, the Yieldable steel support are Telescopic U-shaped steel arch form bracket, and the contractibility is U-shaped
Steel arch type bracket is adapted with soft-rock tunnel size, and the Telescopic U-shaped steel arch form bracket clamp is set to the concrete spray coating
Outside, for further carrying out supporting to soft-rock tunnel.
In a kind of soft-rock tunnel full length fastening supporting construction as described above, it is preferable that the anchor cable and anchor pole bottom are all provided with
There is class spring section, the class spring section is more reinforcing bars by bending repeatedly, and the class spring section is fixed on the anchor cable
With the bottom of anchor pole, for the instantaneously pressure of rock stratum adequately to be stirred and discharged to the Anchor Agent in hole；
Further preferably, the class spring section is reserved with straightway, and the bottom of the anchor cable and anchor pole is fixed on by straightway
Portion is fixed on the anchor cable and anchor pole convenient for the class spring section.
In a kind of soft-rock tunnel full length fastening supporting construction as described above, it is preferable that the axle body of the anchor cable and anchor pole is equal
Equipped with multiple taper iron, the taper Tie Tong crosses bottom surface and is welded and fixed with the anchor cable and anchor pole, multiple equal edges of taper iron
The S-type arrangement of the axle body of the anchor cable and anchor pole, convenient for adequately being stirred to the Anchor Agent in hole.
In a kind of soft-rock tunnel full length fastening supporting construction as described above, it is preferable that on two vertical steel pipe supports
Two pairs of holes are equipped with, each pair of hole is distributed in the inner side and outer side of the vertical steel pipe support, wherein first pair of apertures hole position
In the top of the vertical steel pipe support, and it is in same horizontal line, second pair of hole is located at the vertical steel pipe support and institute
The junction of bended pipe bracket is stated, and circle center line connecting and trunnion axis have certain angle；
In a kind of soft-rock tunnel full length fastening supporting construction as described above, it is preferable that the bended pipe bracket is equipped with
Three pairs of holes, each pair of hole are distributed in the interior outside of the bended pipe bracket, are inserted into convenient for the anchoring piece into country rock, three
It uniformly arranges on the bended pipe to hole；
Further preferably, the inboard aperture hole diameter on the vertical steel pipe support and the bended pipe bracket with it is described
Anchor cable is consistent with bolt diameter, and apertura lateralis hole diameter is greater than inboard aperture hole diameter.
In a kind of soft-rock tunnel full length fastening supporting construction as described above, it is preferable that the vertical steel pipe support and described
Bended pipe bracket is an integral molding structure.
In a kind of soft-rock tunnel full length fastening supporting construction as described above, it is preferable that the length of the class spring section is
10cm, the reserved straight line segment length 3cm.
A kind of construction method using soft-rock tunnel full length fastening supporting construction described in any of the above-described, the construction method
The following steps are included:
Step 1, the installation of steel pipe support:
Tunnel bottom inverted arch size is adjusted first with tool, so that steel pipe support can be smoothly put into；It adjusts
Later, it according to parameters such as the height of hole location each on steel pipe support and inclination angles, is helped and arch using drilling machine in tunnel bottom, two
It drills according to the length of preset anchor cable, as anchor cable hole, the aperture of anchor cable hole is greater than the diameter of corresponding anchor cable；Drilling knot
Shu Hou is first crammed anchor cable hole with waddy, then to the certain thickness concrete of tunnel base injcction and levelling, so as to steel pipe support
After being put into, lower end surface can be contacted with concrete completely, guarantee its bottom uniform stressed；Finally the waddy crammed is taken again
Out, and by steel pipe support it is sequentially placed into tunnel bottom；
Step 2, on steel pipe support horizontal direction anchor cable installation:
Cable bolting is carried out at the first pair of apertures hole position that steel pipe support is reserved first, first to the position of vertical steel pipe support
Supporting, the symmetrical supporting of the right and left, specific method for protecting support step are carried out at the first pair of apertures hole of horizontal direction are as follows:
First successively launched into anchor cable hole at a slow speed, middling speed and rapid resin powder stick, then using anchor cable fitting machine by anchor cable
It is sent into anchor cable hole, carries out the stirring of certain time, the state certain time is kept after stirring, then pallet is installed, then
Anchor cable fitting machine is pulled up, certain prestressing force is applied to anchor cable by anchorage cable stretching instrument after last resin explosive roll solidification；
Step 3, the installation with vertical direction anchor cable is tilted on steel pipe support:
Using the method for protecting support described in step 2, successively at second pair of hole location of vertical steel pipe support and bending
Inclination hole and vertical hole on steel pipe support carry out cable bolting, and support pattern is that steel pipe support both sides symmetrically carry out, with
Just soft-rock tunnel uniform force is inserted into convenient for anchor cable；
Step 4, the slip casting of steel pipe support:
After anchor cable on steel pipe support is all installed, the end cap of vertical steel pipe support end is opened, carries out slip casting, first
Superfine cement slurry is injected, superfine cement slurries penetrate into anchor cable hole by hole on the outside of steel pipe support, penetrate into anchor cable hole bottom to slurries
When portion, change note flowing concrete, until all being filled in steel pipe support, finally closes end cap；
Step 5, soft-rock tunnel two is helped and the installation of arch anchor cable:
Using the method for protecting support described in step 2, position and arch position successively are helped to above steel pipe support two from top to bottom
Place's installation anchor cable, separated by a distance between anchor cable, support pattern is two to help symmetrical while constructing, so that soft-rock tunnel stress is equal
It is even, it is inserted into convenient for anchor cable；
Step 6, the installation of anchor pole:
Anchor cable install after, carry out drilling through for bolthole, soft-rock tunnel two help with arch it is spaced apart according to
The length of preset anchor pole drills, as bolthole, and the aperture of bolthole is greater than the diameter of corresponding anchor pole for installing anchor
Bar, anchor pole interts with anchor cable to be arranged alternately, and installs the specific steps of anchor pole are as follows:
First middling speed and rapid resin powder stick are successively launched into bolthole, the resin explosive roll at arch using support device into
Then anchor pole is sent into bolthole using roof bolting machine, carries out the stirring of certain time, keep after stirring by row support
The state certain time, then pallet is installed, roof bolting machine is then pulled up, finally passes through anchor pole tensioning after resin explosive roll solidification
Instrument applies certain prestressing force to anchor pole；
Step 7, the laying of metal mesh:
After anchor cable and rockbolt installation, fixed metal mesh is hung using anchor cable and anchor pole exposed parts paving；
Step 8, concrete spray coating pours:
After the completion of metal mesh is laid with, casting concrete spray-up is all sprayed inside soft-rock tunnel surrounding, and levelling；
Step 9, the installation of Telescopic U-shaped steel arch form bracket:
After concrete spray coating pours, Telescopic U-shaped steel arch form bracket, U-shaped steel arch form are set up inside soft-rock tunnel
Collapsible timbering size is adapted with soft-rock tunnel size, as the advanced stress concentration region of the advance of the face constantly moves forward, at this time
Telescopic U-shaped steel arch support should be disassembled, then set up advanced stress concentration region, which is located in front of working face
And apart from working face be 30~50m, Telescopic U-shaped steel arch support is installed according to condition of construction installation-disassembly-again.
The construction method of soft-rock tunnel full length fastening supporting construction as described above, it is preferable that slow resin powder stick in step 2
It in the gel time of 45mm is 4min for anchoring consistency, as A class Anchor Agent, the long 1.0m of single-unit powder stick；
Middling speed resin explosive roll is that anchoring consistency in the gel time of 50mm is 3min, and as B class Anchor Agent, single-unit powder stick are long
1.0m；
Rapid resin powder stick is that anchoring consistency in the gel time of 50mm is 150s, and as C class Anchor Agent, single-unit powder stick are long
1.2m。
The construction method of soft-rock tunnel full length fastening supporting construction as described above, it is preferable that in step 2, anchor cable was installed
The prestressing force applied in journey is not less than 120KN；
In the step 6, the prestressing force applied during rockbolt installation is not less than 80KN.
The construction method of soft-rock tunnel full length fastening supporting construction as described above, it is preferable that step 1 stream line hole eyelet is inclined
Slope is no more than 2%；
Bolthole eyelet deviation proportion is no more than 2% in step 6.
Compared with the immediate prior art, technical solution provided by the utility model has following excellent effect:
The utility model is set to soft-rock tunnel bottom using steel pipe support, then on steel pipe support and around tunnel into
The end of row anchor cable and suspension roof support, anchor cable and anchor pole is provided with class spring section, not only can adequately be stirred coagulator
It mixes, and when rock stratum moment is to press, class spring section can make rock stratum and anchor cable/anchor pole coordinate stress, due to bottom class spring
Section can be discharged and instantaneously be pressed, and weakened stress and concentrated, so as to effectively avoid anchor cable/anchor pole from being pulled off, in roadway's sides and
Arch is arranged alternately according to certain inclination angle and parameter, and is applied prestressing force to anchor cable and anchor pole and carried out full anchoring support, effectively
The tunnel in front of stope coal wall and the stress distribution of country rock are improved, the strong bottom distension for eliminating advanced stress concentration region is existing
As, anchoring piece is not vulnerable, and supporting effect is good, and it is at low cost, it ensure that the safety of construction work.
Detailed description of the invention
The accompanying drawings constituting a part of this application is used to provide a further understanding of the present invention, this is practical
Novel illustrative embodiments and their description are not constituteed improper limits to the present invention for explaining the utility model.
Wherein:
Fig. 1 is the soft-rock tunnel vertical section structure schematic diagram of the utility model embodiment；
Fig. 2 is the steel pipe support structural schematic diagram of the utility model embodiment；
Fig. 3 is the anchor cable structure schematic diagram of the utility model embodiment；
Fig. 4 is the anchor structure schematic diagram of the utility model embodiment；
Fig. 5 is the taper iron construction schematic diagram of the utility model embodiment；
Fig. 6 is the anchor cable full length fastening structural schematic diagram of the utility model embodiment；
Fig. 7 is the anchor pole full length fastening structural schematic diagram of the utility model embodiment；
Fig. 8 is that the anchor cable hole of the utility model embodiment installs the structural schematic diagram of resin explosive roll；
Fig. 9 is that the bolthole of the utility model embodiment installs the structural schematic diagram of resin explosive roll.
In figure: 1, the first anchor cable；2, the second anchor cable；3, third anchor cable；4, the 4th anchor cable；5, the 5th anchor cable；6, the 6th anchor
Rope；7, the 7th anchor cable；8, the 8th anchor cable；9, the 9th anchor cable；10, the first anchor pole；11, the second anchor pole；12, third anchor pole；13,
Four anchor poles；14, metal mesh；15, concrete spray coating；16, Telescopic U-shaped steel arch form bracket；17, A class Anchor Agent；18, B class anchors
Agent；19, C class Anchor Agent；20, country rock；21, steel pipe support；211, vertical steel pipe support；212, bended pipe bracket；213,
A pair of of hole；214, second pair of hole；22, class spring section；221, straightway；23, taper iron；24, end cap.
Specific embodiment
The utility model will be described in detail below with reference to the accompanying drawings and embodiments.It should be noted that not conflicting
In the case where, the feature in the embodiments of the present invention and embodiment can be combined with each other.
In the description of the present invention, term " longitudinal direction ", " transverse direction ", "upper", "lower", "front", "rear", "left", "right",
The orientation or positional relationship of the instructions such as "vertical", "horizontal", "top", "bottom" is to be based on the orientation or positional relationship shown in the drawings,
It is merely for convenience of description the utility model rather than requires the utility model that must be constructed and operated in a specific orientation, therefore
It should not be understood as limiting the present invention.Term used in the utility model " connected ", " connection " shall be understood in a broad sense,
For example, it may be being fixedly connected, may be a detachable connection；It can be directly connected, it can also be indirect by intermediate member
It is connected, for the ordinary skill in the art, can understands the concrete meaning of above-mentioned term as the case may be.
As shown in Figures 1 to 9, embodiment according to the present utility model provides a kind of soft-rock tunnel full length fastening supporting
Structure, supporting construction include:
Steel pipe support 21, according to tunnel section design size and inverted arch design requirement, prior prefabricated steel pipe support 21,
Steel pipe support 21 is set to soft-rock tunnel bottom, and steel pipe support 21 is U-shaped structure, including the vertical steel pipe support 211 in left and right ends
Vertical portion and bent intermediate steel pipe support 212 curved portion, it is preferred that vertical steel pipe support 211 and bended pipe bracket 212
It is integrally formed, its rigidity is effectively ensured, diameter of steel tube 180mm, steel pipe is with a thickness of 16mm, vertical steel pipe length about 80cm；Steel
Pipe holder 21 is equipped with multiple holes, carries out roadway support convenient for anchoring piece insertion, is perfused with the high-strength height of C50 in steel pipe support 21
Fluidity concrete.
Preferably, two pairs of holes are equipped on two vertical steel pipe supports 211, each pair of hole is distributed in vertical steel pipe branch
The inner side and outer side of frame 211, wherein first pair of apertures hole 213 is located at the top of steel pipe support 21, and is in same horizontal line, and second
Be located at the junction of vertical steel pipe support 211 with bended pipe bracket 212 to hole 214, and inside and outside side cavities circle center line connecting with
Trunnion axis angle is 45 °.
Bended pipe bracket 212 be equipped with three pairs of holes, each pair of hole be distributed in bended pipe bracket 212 inside and
Outside, three pairs of holes are uniformly arranged on bended pipe, and side circle center line connecting is with trunnion axis angle inside and outside two pairs of holes on both sides
75 °, intermediate a pair of hole circle center line connecting and trunnion axis are in 90 °, are distributed in the midline of bended pipe bracket 212, anchoring piece from
It is inserted at hole into country rock 20.
Inboard aperture hole diameter on vertical steel pipe support 211 and bended pipe bracket 212 is straight with anchor cable and anchor pole
Diameter is consistent, and apertura lateralis hole diameter is greater than inboard aperture hole diameter, about the 1.2 of medial aperture times, naturally it is also possible to be that other are greater than
1.2 times of medial aperture other numerical value enter anchor cable hole and bolthole from outside hole seepage flow convenient for later period grouting concrete, into
Row full length fastening.
Anchoring piece, anchoring piece include anchor cable and anchor pole, and anchor cable and anchor pole have multiple, are distributed in the surrounding of soft-rock tunnel, anchor
Rope and anchor pole pass through in the country rock 20 at the insertion of the hole on steel pipe support 21 tunnel periphery place, for carrying out to soft-rock tunnel
Supporting.
Anchor cable and anchor pole bottom are equipped with class spring section 22, and class spring section 22 is more reinforcing bars by bending repeatedly,
Class spring section 22 is reserved with straightway 221, and the bottom of anchor cable and anchor pole is fixed on by straightway 221, easy for installation, for pair
Anchor Agent in hole is adequately stirred, and when Deformation in Soft Rock Tunnel it is uneven, anchor cable or/and anchor pole local pressure collection
It can effectively be adjusted by the steel wire of top class spring section 22 when middle, and when rock stratum moment is to press, bottom class bullet
Spring section 22 can make rock stratum and anchor cable/anchor pole weaken concentrated stress, concentrated stress be discharged, so as to effectively avoid anchor cable/anchor
Bar is pulled off.
The bar diameter that class spring section 22 uses is 4mm, and the length of class spring section 22 is 10cm, reserved straightway 221
Long 3cm.
The axle body of anchor cable and anchor pole is equipped with multiple taper iron 23, and taper iron 23 is triangular pyramid, 23 distance between centers bottom of taper iron
Portion vertical height 2cm, taper iron 23 are welded and fixed by bottom surface and anchor cable and anchor pole, and S-type along the axle body of anchor cable and anchor pole
Arrangement, anchor cable and anchor pole are staggeredly arranged along axial longitudinal section, the interval of taper iron 23, and adjacent conical iron 23 is spaced 10cm, convenient for into
One step the Anchor Agent in hole is adequately stirred and it is subsequent can preferably be acted on Anchor Agent and country rock 20,
Guarantee anchoring effect.
Metal mesh 14, metal mesh 14 are fixed by anchoring piece exposed parts, are laid on soft-rock tunnel inner surface, metal
What net 14 was covered on soft-rock tunnel two helps and arch, and 14 specification of metal mesh is 2m × 1m, and material is galvanized wire, diameter 8mm,
Mesh is square.
Concrete spray coating 15, concrete spray coating 15 are covered in 14 outer layer of metal mesh and soft-rock tunnel bottom, for soft rock
Tunnel is reinforced, and the intensity of concrete selects C30, jetting thickness 120mm.
Yieldable steel support, Yieldable steel support are Telescopic U-shaped steel arch form bracket 16, Telescopic U-shaped steel arch form
Bracket 16 is adapted with soft-rock tunnel size, and is arranged in 15 outside of concrete spray coating, for further carrying out to soft-rock tunnel
Supporting.
In order to better understand the technical solution of the utility model soft-rock tunnel full length fastening supporting construction, the utility model
A kind of construction method of soft-rock tunnel full length fastening is also provided, comprising the following steps:
Step 1, the installation of steel pipe support 21:
Tunnel bottom inverted arch size is micro-adjusted first with tools such as pneumatic pick, spades, so as to 21 energy of steel pipe support
Smoothly it is put into；After adjusting, according to parameters such as the height of hole location each on steel pipe support 21 and inclination angles, baseboard anchor cable is used
Drilling machine, soft-rock tunnel two are helped to be drilled with common anchor cable rig by each preformed hole anchor cable length in design supporting scheme, eyelet
Deviation proportion is no more than 2%, as anchor cable hole, and the aperture of anchor cable hole is greater than the diameter of corresponding anchor cable；After drilling, waddy is first used
Anchor cable hole is crammed, then to the C25 concrete of tunnel base injcction 30cm thickness and levelling, after being put into so as to steel pipe support 21,
Lower end surface can be contacted with concrete completely, be not present uneven place, guarantee its bottom can stress, bearing load；Finally
The waddy crammed is taken out again, and steel pipe support 21 is sequentially placed into tunnel bottom.
Next the first installation supporting to anchor cable is carried out on steel pipe support 21, then helps soft-rock tunnel two and arch carries out
The installation and supporting of anchor cable and anchor pole, since soft-rock tunnel or so two is helped with bottom supporting construction and supporting parameter with soft-rock tunnel
Center line is that symmetry axis is axisymmetricly arranged, so be only illustrated by taking the roadway support of right side as an example herein.
The Anchor Agent put into during anchor cable and rockbolt installation is resin explosive roll Anchor Agent, including three kinds of different types
Number, slow resin powder stick is that anchoring consistency in the gel time of 45mm is 4min, and as A class Anchor Agent 17, single-unit powder stick are long
1.0m；
Middling speed resin explosive roll is that anchoring consistency in the gel time of 50mm is 3min, as B class Anchor Agent 18, single-unit powder stick
Long 1.0m；
Rapid resin powder stick is that anchoring consistency in the gel time of 50mm is 150s, as C class Anchor Agent 19, single-unit powder stick
Long 1.2m.
As shown in table 1 below is each when steel pipe support 21 and two is helped in soft-rock tunnel and the anchor cable of arch different location is installed
It joint number, mixing time minimum and the retention time that a anchor cable aperture and hole depth, anchor cable diameter and length, Anchor Agent are launched, applies
The minimum and different location anchor cable of Prestressing and the angle degree of trunnion axis.
Parameter when different location anchor cable is installed in 1 soft-rock tunnel of table
| Anchor cable number | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 | 9 |
| Anchor cable hole depth/mm | 5200 | 6400 | 5200 | 5200 | 5200 | 6400 | 6400 | 5200 | 6400 |
| Anchor cable aperture/mm | 30 | 30 | 30 | 30 | 28 | 28 | 28 | 28 | 28 |
| Anchor cable length/mm | 5400 | 6600 | 5400 | 5400 | 5400 | 6600 | 6600 | 5400 | 6600 |
| Anchor cable diameter/mm | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 | 22 |
| Mixing time/min | 1.3 | 1.5 | 1.3 | 1.3 | 1.3 | 1.5 | 1.5 | 1.3 | 1.5 |
| Retention time/s | 50 | 50 | 50 | 50 | 50 | 50 | 50 | 50 | 50 |
| Apply prestressing force/KN | 120 | 140 | 120 | 120 | 120 | 140 | 140 | 120 | 140 |
| Place powder stick/A, B, C joint number | 221 | 222 | 221 | 221 | 221 | 222 | 222 | 221 | 222 |
| With trunnion axis angle/° | 0 | 45 | 75 | 90 | 0 | 15 | 40 | 60 | 90 |
Step 2, on steel pipe support 21 the first anchor cable of horizontal direction 1 installation:
1 supporting of the first anchor cable is carried out at 213 position of first pair of apertures hole that steel pipe support 21 is reserved first, first to vertical steel
Supporting, the symmetrical supporting of the right and left, specific steps are carried out at the first pair of apertures hole 213 positioned at horizontal direction of pipe holder 211 are as follows:
First successively launched into anchor cable hole 2 section A classes at a slow speed, 2 section B class middling speeds and 1 section C class rapid resin powder stick, need to ensure
The holding force point of tray bottom two is that anchor cable is then sent into anchor cable hole using anchor cable fitting machine in a more smooth scar
Interior, mixing time is not less than 1.3min, state 50s is kept after stirring, then install pallet, then pulls up anchor cable installation
Machine；First anchor cable 1 is high-strength prestressed anchor cable, and diameter of phi 22mm, long 5400mm pass through anchorage cable stretching after resin explosive roll solidification
Instrument applies prestressing force to the first anchor cable 1 and is not less than 120kN, the reserved anchor cable 1 of anchor cable hole depth 5200mm, aperture 30mm, first at this
Away from the perpendicular top 15cm of vertical steel pipe support 211.
2nd~9 any anchor cable is high-strength prestressed anchor cable.
Step 3, the installation with vertical direction anchor cable is tilted on steel pipe support 21:
Using the method for protecting support described in step 2, relevant parameter installation branch is carried out according to the anchor cable of the different numbers in table 1
Shield successively tilts the both sides at second pair of 214 position of hole of vertical steel pipe support 211 and on bended pipe bracket 212
Hole and vertical hole successively carry out the second anchor cable 2, third anchor cable 3, the 4th anchor cable 4 and its axisymmetric position supporting, supporting side
Formula is that 21 both sides of steel pipe support symmetrically carry out, i.e. carries out third anchor cable 3 after the completion of the second anchor cable 2 and its symmetric position supporting again
Shield is inserted into so as to soft-rock tunnel uniform force convenient for anchor cable.
Step 4, the slip casting of steel pipe support 21:
After anchor cable on steel pipe support 21 is all installed, the end cap 24 of vertical 211 end of steel pipe support, end cap are opened
24 be made of the higher cast steel of rigidity, and the part for going deep into steel duct is long, when carrying out slip casting, first injects superfine cement
Slurry, superfine cement slurries penetrate into anchor cable hole by 21 outside hole of steel pipe support, when slurries penetrate into anchor cable hole bottom, slurries packet
The anchor cable in hole is surrounded to form full length fastening, after injection superfine cement starches 2~3 full packages, in steel pipe support 21 to be found
Change note C50 flowing concrete when slurries remain little finally to close end cap 24 until all filling in steel pipe support 21,
It is allowed to be integrally formed with steel pipe support 21 when covering end cap 24 so as to preferably stress.
Step 5, soft-rock tunnel two is helped and the installation of arch anchor cable:
Using the method for protecting support described in step 2, relevant parameter installation branch is carried out according to the anchor cable of the different numbers in table 1
Shield successively helps to install the 5th anchor cable 5, the 6th anchor cable 6, the at position and arch position to the top of steel pipe support 21 two from top to bottom
Seven anchor cables 7, the 8th anchor cable 8, the 9th anchor cable 9, it is separated by a distance between anchor cable；Wherein the 5th anchor cable 5 is located at vertical steel pipe branch
For 211 top surface of frame far from the right side the top center position in tunnel, the anchor cable hole position of the 6th anchor cable 6 is located at right side top topmost
The anchor cable hole position of the position 5-8cm, the 7th anchor cable 7 is located at right arch springing bottom top position, apart from right arch springing bottom 8-
10cm, the 9th anchor cable 9 are that vertical direction is located at tunnel arch center, and the 8th anchor cable 8 is located in the 7th anchor cable 7 and the 9th anchor cable 9
Heart position, support pattern are helped symmetrical while being constructed, so as to soft-rock tunnel uniform force, be inserted into convenient for anchor cable, in other realities for two
It applies and is also possible to another side of constructing again of having constructed on one side in example, suitable for the situation of personnel and equipment anxiety, until the 9th anchor cable 9
After the completion of vertical direction construction, soft-rock tunnel two is helped to construct completely with arch anchor cable and be finished, and the installation and supporting of anchor pole are started.
It is as shown in table 2 below to be helped for 21 top of steel pipe support, soft-rock tunnel two and when the rockbolt installation of arch different location
When each anchor pole aperture and hole depth, bolt diameter and length, the joint number that Anchor Agent is launched, the minimum of mixing time and holding
Between, apply the angle degree of prestressed minimum and different location anchor pole and trunnion axis.
Parameter in 2 soft-rock tunnel of table when different location rockbolt installation
| Anchor pole number | 10 | 11 | 12 | 13 |
| Anchor pole hole depth/mm | 2200 | 2200 | 2200 | 2200 |
| Anchor pole aperture/mm | 28 | 28 | 28 | 28 |
| Anchor pole length/mm | 2400 | 2400 | 2400 | 2400 |
| Bolt diameter/mm | 22 | 22 | 22 | 22 |
| Mixing time/s | 45 | 45 | 45 | 45 |
| Retention time/s | 50 | 50 | 50 | 50 |
| Apply prestressing force/KN | 80 | 80 | 80 | 80 |
| Place powder stick/B, C joint number | 11 | 11 | 11 | 11 |
| With trunnion axis angle/° | 0 | 0 | 50 | 70 |
Step 6, the installation of anchor pole:
Anchor cable install after, carry out drilling through for bolthole, soft-rock tunnel two help with arch it is spaced apart according to
The length of preset bolthole drills, as bolthole, and eyelet deviation proportion is required to control within 2%, bolthole
Aperture is greater than the diameter of corresponding anchor pole, bolthole and anchor cable pitch of holes 500mm, and anchor pole interts with anchor cable iterative cycles replaces row
Cloth installs the specific steps of anchor pole are as follows:
The installation of the first anchor pole 10 is carried out first, and 1 section B class middling speed and 1 section C class are first successively launched into 10 hole of the first anchor pole
Rapid resin powder stick, the resin explosive roll at arch in bolthole are supported using support device, prevent because resin explosive roll from
The gravity of body and automatic drop, need to ensure the holding force point of tray bottom two be in a comparatively smooth scar,
Then anchor pole is sent into 10 hole of the first anchor pole using roof bolting machine, is stirred, mixing time is not less than 45s, stirring knot
State 50s is kept after beam, then pallet is installed, then pulls up roof bolting machine, finally passes through anchor pole after resin explosive roll solidification
Tensioning instrument applies the prestressing force for being not less than 80KN to anchor pole.
According to the installation of the first anchor pole 10 and method for protecting support, different anchor pole phases are carried out according to the anchor pole of the different numbers in table 2
It answers parameter that supporting is installed, successively helps that the first anchor pole 10, the second anchor pole 11, the are installed with arch from top to bottom the two of soft-rock tunnel
Three anchor poles 12 and the 4th anchor pole 13；Wherein the first anchor pole 10 is located among the first anchor cable 1 and the 5th anchor cable 5, the second anchor pole 11
Among the 5th anchor cable 5 and the 6th anchor cable 6, third anchor pole 12 is located among the 7th anchor cable 7 and the 8th anchor cable 8, the 4th anchor pole 13
Among the 8th anchor cable 8 and the 9th anchor cable 9.
Any anchor pole of 1-4 is high-strength prestressed anchor pole.
Step 7, the laying of metal mesh 14:
After anchor cable and rockbolt installation, fixed metal mesh 14, metal mesh 14 are hung using anchor cable and anchor pole exposed parts paving
It is laid on soft-rock tunnel inner surface, what metal mesh 14 was covered on soft-rock tunnel two helps and arch, 14 specification of metal mesh are 2m × 1m,
Material is galvanized wire, diameter 8mm, and mesh is square.
Step 8, concrete spray coating 15 pours:
After the completion of metal mesh 14 is laid with, casting concrete spray-up 15 is all sprayed inside soft-rock tunnel surrounding, and levelling；
For reinforcing to soft-rock tunnel, the intensity of concrete selects C30, jetting thickness 120mm.
Step 9, the installation of Telescopic U-shaped steel arch form bracket 16:
After concrete spray coating 15 pours, Telescopic U-shaped steel arch form bracket 16, U-shaped steel are set up inside soft-rock tunnel
Arch form collapsible timbering size is adapted with soft-rock tunnel size, as the advanced stress concentration region of the advance of the face constantly moves forward,
Telescopic U-shaped steel arch support should be disassembled at this time, then set up advanced stress concentration region, which is located at working face
30~50m of front is remote, installs Telescopic U-shaped steel arch support again according to condition of construction installation-disassembly-.
From the above, it can be seen that the utility model first lays the steel pipe support 21 with hole, steel pipe support in tunnel bottom
21 lay when subsection setup, then to steel pipe support 21 carry out anchor cable install supporting, then soft-rock tunnel two is helped and arch into
Row anchor cable and installation and supporting with anchor pole, anchor shaft anchor cable part paving close plating net 14 outstanding carry out linked network and fix and pour mixed
Solidifying soil spray-up 15, finally installs Telescopic U-shaped steel arch trestle, with the lasting propulsion of working face, Telescopic U-shaped steel arch trestle again
It sets up at the 30-50m in front of advanced stress concentration region i.e. working face；The steel pipe support 21 and contractibility of the utility model are U-shaped
The addition of steel arch can well solve that the strong bottom in advanced stress concentration region is swollen, soft-rock tunnel total bolt support structure of large deformation
With the unmatched phenomenon of parameter, while supporting effect is promoted, reduces and lose anchor rate, the safety of underground work personnel is substantially improved；
Furthermore the solid cone shaped iron 23 in the class spring section 22 and axle body of anchor pole and anchor cable bottom is able to ascend sufficiently stirring to anchor rib
It mixes, to promote the better anchorage effect of Anchor Agent.
The above is only the preferred embodiment of the present invention, is not intended to limit the utility model, for this field
Technical staff for, various modifications and changes may be made to the present invention.Within the spirit and principle of the utility model,
Any modification, equivalent replacement, improvement and so on should be included within the scope of protection of this utility model.
Claims (8)
1. a kind of soft-rock tunnel full length fastening supporting construction, which is characterized in that the supporting construction includes:
Steel pipe support, the steel pipe support are set to soft-rock tunnel bottom, and the steel pipe support is U-shaped structure, the institute of U-shaped structure
Stating steel pipe support includes the vertical portion of the vertical steel pipe support in left and right ends and the curved portion of bent intermediate steel pipe support, the steel pipe
Bracket is equipped with multiple holes convenient for anchoring piece insertion, is perfused with concrete in the steel pipe support；
Anchoring piece, the anchoring piece include multiple anchor cables and anchor pole, and multiple anchor cables and anchor pole are distributed in the four of soft-rock tunnel
In Zhou Yanbi, the anchor cable and anchor pole pass through in the country rock at the insertion of the hole on steel pipe support tunnel periphery place, use
In to soft-rock tunnel progress supporting；
Metal mesh, the metal mesh are fixed by the anchoring piece exposed parts, are laid on soft-rock tunnel inner surface, described
What metal mesh was covered on soft-rock tunnel two helps and arch；
Concrete spray coating, the concrete spray coating are covered in the metal mesh outer layer and soft-rock tunnel bottom, for Soft Rock Roadway
Road is reinforced；
Yieldable steel support, the Yieldable steel support are Telescopic U-shaped steel arch form bracket, the Telescopic U-shaped steel arch
Type bracket is adapted with soft-rock tunnel size, and the Telescopic U-shaped steel arch form bracket clamp is set to the outside of the concrete spray coating,
For further carrying out supporting to soft-rock tunnel.
2. soft-rock tunnel full length fastening supporting construction as described in claim 1, which is characterized in that the anchor cable and anchor pole bottom
It is equipped with class spring section, the class spring section is more reinforcing bars by bending repeatedly, and the class spring section is fixed on described
The bottom of anchor cable and anchor pole, for the instantaneously pressure of rock stratum adequately to be stirred and discharged to the Anchor Agent in hole.
3. soft-rock tunnel full length fastening supporting construction as claimed in claim 2, which is characterized in that the axis of the anchor cable and anchor pole
Body is equipped with multiple taper iron, and the taper Tie Tong crosses bottom surface and is welded and fixed with the anchor cable and anchor pole, multiple taper iron
Along the S-type arrangement of axle body of the anchor cable and anchor pole, convenient for adequately being stirred to the Anchor Agent in hole.
4. soft-rock tunnel full length fastening supporting construction as described in claim 1, which is characterized in that two vertical steel pipe branch
Two pairs of holes are equipped on frame, each pair of hole is distributed in the inner side and outer side of the vertical steel pipe support, wherein first pair of apertures
Hole is located at the top of the vertical steel pipe support, and is in same horizontal line, and second pair of hole is located at the vertical steel pipe support
With the junction of the bended pipe bracket, and circle center line connecting and trunnion axis have certain angle；
The bended pipe bracket is equipped with three pairs of holes, and each pair of hole is distributed in the interior outside of the bended pipe bracket,
It is inserted into convenient for the anchoring piece into country rock, three pairs of holes are uniformly arranged on the bended pipe.
5. soft-rock tunnel full length fastening supporting construction as described in claim 1, which is characterized in that the vertical steel pipe support and
The bended pipe bracket is an integral molding structure.
6. soft-rock tunnel full length fastening supporting construction as claimed in claim 2, which is characterized in that the class spring section is reserved with
Straightway, and it is fixed on by straightway the bottom of the anchor cable and anchor pole, convenient for the class spring section in the anchor cable and anchor
It is fixed on bar.
7. soft-rock tunnel full length fastening supporting construction as claimed in claim 4, which is characterized in that be located at the vertical steel pipe branch
Inboard aperture hole diameter on frame and the bended pipe bracket is consistent with the anchor cable and bolt diameter, and apertura lateralis hole diameter is big
In inboard aperture hole diameter.
8. soft-rock tunnel full length fastening supporting construction as claimed in claim 6, which is characterized in that the length of the class spring section
For 10cm, the reserved straight line segment length 3cm.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821062581.1U CN208456648U (en) | 2018-07-05 | 2018-07-05 | A kind of soft-rock tunnel full length fastening supporting construction |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821062581.1U CN208456648U (en) | 2018-07-05 | 2018-07-05 | A kind of soft-rock tunnel full length fastening supporting construction |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109026099A (en) * | 2018-07-05 | 2018-12-18 | 安徽理工大学 | A kind of soft-rock tunnel full length fastening supporting construction and its construction method |
| CN110985077A (en) * | 2019-11-22 | 2020-04-10 | 中铁十二局集团有限公司 | Method for preventing tunnel inverted arch from bulging by utilizing prestressed anchor cable |
-
2018
- 2018-07-05 CN CN201821062581.1U patent/CN208456648U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109026099A (en) * | 2018-07-05 | 2018-12-18 | 安徽理工大学 | A kind of soft-rock tunnel full length fastening supporting construction and its construction method |
| CN109026099B (en) * | 2018-07-05 | 2023-09-12 | 安徽理工大学 | Soft rock roadway full-length anchoring supporting structure and construction method thereof |
| CN110985077A (en) * | 2019-11-22 | 2020-04-10 | 中铁十二局集团有限公司 | Method for preventing tunnel inverted arch from bulging by utilizing prestressed anchor cable |
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