CN208502786U - Multilevel hierarchy suspension device for rich water sandy gravel stratum tunnel - Google Patents
Multilevel hierarchy suspension device for rich water sandy gravel stratum tunnel Download PDFInfo
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- CN208502786U CN208502786U CN201821133281.8U CN201821133281U CN208502786U CN 208502786 U CN208502786 U CN 208502786U CN 201821133281 U CN201821133281 U CN 201821133281U CN 208502786 U CN208502786 U CN 208502786U
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- carring arch
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Abstract
The utility model discloses a kind of multilevel hierarchy suspension devices for rich water sandy gravel stratum tunnel, including advanced Load -carring arch, passive Load -carring arch and lag Load -carring arch, advance support is carried out to Rock And Soil above roadway head by using mining self-drilling type advanced Short bolt, and then form the advanced Load -carring arch of a mining advanced Short bolt anchoring of self-drilling type, i.e. level-one supporting；I-steel grille frame passively subjects part pressure from surrounding rock and forms passive Load -carring arch, i.e. second level supporting；After leading note pipe water guide release, the grouting for water blocking and strength reinforcing of rich water loose wall rock are carried out, and then form the lag Load -carring arch of country rock, i.e. three-level supporting；Early period, productive life and the later period of adopting that the utility model digs rich water sandy gravel stratum tunnel in working face of coal seam by multistage, many levels carry out collaboration supporting, to reduce a possibility that country rock wall caving, roof fall occurs, the surrounding rock stability in rich water sandy gravel stratum tunnel is improved.
Description
Technical field
The utility model relates to a kind of suspension device in tunnel, specifically a kind of multistage layer for rich water sandy gravel stratum tunnel
Secondary suspension device.
Background technique
Sandy gravel stratum is made of the Rock And Soil medium that loosely organized, granular size difference is big, consolidation diagenesis is low, the ground
The problems such as roof collapse easily occurs layer for tunnel, unstability collapses, deformation of timbering failure.Especially in the case of country rock rich water, underground water
Discharge, leakage plugging problem carry no weight, and lead to that roadway surrounding rock pressure increased dramatically, stability declines to a great extent, and are significantly greatly increased
Roadway support difficulty.Therefore, under the conditions of rich water sandy gravel stratum tunnel construction, supporting become China part mining area production, construction
A great problem.
Mine laneway routine method for protecting support still remains many in terms of reply rich water sandy gravel stratum deformation of the surrounding rock in tunnel, unstability
The problem of aspect.First, common single method for protecting support (anchor rete cord or metallic support) can not effectively solve country rock wall caving, roof fall etc.
Problem.For example, since sandy gravel stratum surrounding rocks particle is extremely uneven, hardness is larger, cementing properties is poor, being led when using anchor pole (rope)
Cause anchor hole especially anchor cable hole pore-forming relatively difficult, and anchor pole (rope) nothing reliably puts forth effort basis, therefore anchoring support is big absolutely
Part is failure；And use metallic support supporting when, because its be passive protecting, intensity, rigidity are limited, can not resist loosening,
Hydraulically-formed huge confining pressure causes bracket distort, fracture, leakage emits destruction etc. between frame.Second, at present for there is the richness of leakage
Water loose wall rock laneway support, it is general to carry out grouting for water blocking and reinforce, but the draining pilot of country rock is seriously ignored, still without one
Set drains the integrative solution of release, sealing, reinforcing.Third, sandy gravel stratum roadway surrounding rock intensity is low, globality poor, not only
Piece is easy to produce in service stage and emits disaster, and roof fall also easily occurs during digging of constructing and destroys, therefore advance support is very heavy
It wants.But the stubborn problems such as frequent collapse hole, one-tenth porosity be low will be encountered using common Shed-pipe Advanced Support (slip casting) or advance anchor bolt,
It is therefore necessary to emit destruction from before digging, in digging to integrated control loose wall rock piece after digging.It can be seen that current tunnel
Method for protecting support, supporting construction are unable to satisfy the requirement of rich water sandy gravel stratum improving stability of surrounding rocks in roadway control, it cannot be guaranteed that tunnel safety
It uses.
Summary of the invention
In view of the above-mentioned problems of the prior art, the utility model provides a kind of multistage for rich water sandy gravel stratum tunnel
Level suspension device in early period, productive life and the later period of adopting that can be dug in working face of coal seam, can effectively help back and two
Supporting is carried out, to reduce a possibility that country rock wall caving, roof fall occurs, improves the surrounding rock stability in rich water sandy gravel stratum tunnel.
To achieve the goals above, the technical solution adopted in the utility model is: a kind of for rich water sandy gravel stratum tunnel
Multilevel hierarchy suspension device, including advanced Load -carring arch, passive Load -carring arch and lag Load -carring arch,
The advanced Load -carring arch is by multiple mining advanced Short bolts of self-drilling type along roadway's sides and the drilling cloth of back
If composition, the mining advanced Short bolt of self-drilling type includes hollow anchor bar body, ring taps, drill bit, fastening nut and backing plate, the brill
Head is internal to be equipped with hollow cavity, and drill bit is fixed on the front end of hollow anchor bar body and hollow cavity is connected to the inside of hollow anchor bar body, bores
Multiple overflow holes being connected to hollow cavity are opened up on head side wall, hollow anchor bar external surface is equipped with screw thread, drill bit and part hollow
Anchor bar body is in drilling, and the tail end of hollow anchor bar body is in outside drilling, and ring taps covers external in the hollow anchor bar in drilling
Surface, the wall that backing plate covers the tail end in hollow anchor bar body and is pressed on around drilling by fastening nut, in drilling
Hollow anchor bar body inside fluidised form water-proof adhesive is housed；
The passive Load -carring arch is I-steel grille frame, and I-steel grille frame is along roadway's sides and back in arch
Shape arrangement, the I-steel grille frame are bolted by multiple I-steel grid modules and are formed, I-steel grid modules
For grid structure, it is welded to form in a crisscross manner by multiple I-steel；
The lag Load -carring arch leads dispensing device and reinforcing layer forms by multiple, and multiple dispensing devices of leading are laid in I-steel respectively
In grille frame in the wall in grid gap, reinforcing layer is to solidify formation in dispensing device after slip casting to multiple lead, described to lead note
Device is the note pipe of leading equipped with taper top guide, leads and opens up multiple strip-shaped holes on the side wall of note pipe, and multiple strip-shaped holes are in quincunx point
Cloth is in wall in the side wall for leading note pipe, the top guide for leading note pipe, and the tail end for leading note pipe is in outside wall.
It further, further include water guide enlarged portion, the tail end for leading note pipe opens up screw thread mouth, and the water guide enlarged portion is variable diameter
Pipe, the lesser one end of diameter are fixedly connected by screw thread mouth with note pipe is led.It can be improved using water guide enlarged portion to country rock underground
The quick water guide release of water, provides advantage for surrounding rock supporting.
It further, further include strainer, the strainer is wrapped in the outside for leading note pipe.Using strainer can prevent rubble silt with
Water flows into strip-shaped hole, causes hole plug.
Compared with prior art, the utility model is combined using advanced Load -carring arch, passive Load -carring arch and lag Load -carring arch
Mode has the advantage that
(1) it is directed to the feature of rich water sandy gravel stratum roadway surrounding rock medium cementing properties difference, it is short in advance by using mining self-drilling type
Anchor pole carries out advance support to Rock And Soil above roadway head, and then forms a mining advanced Short bolt anchor of self-drilling type
Solid advanced Load -carring arch, i.e. level-one supporting efficiently solves during advance support body construction that frequently collapse hole, pore-forming efficiency are low
Problem, and ensure that tunnel excavates the safety and stablization of initial stage.
(2) I-steel grille frame has bigger intensity and space stiffness compared with ordinary stent, and bearing capacity is high,
And its splicing assembling is constructed by mechanical equipment, also improves support efficiency.I-steel grille frame passively subjects part
Pressure from surrounding rock forms passive Load -carring arch, i.e. second level supporting.
(3) strip-shaped hole for leading note pipe not only can drain relief tube and slip casting so that leading note pipe and have concurrently with pulp again with water guide
The function of pipe, saves engineering material, reduces support cost.Meanwhile it leading note pipe outer end and being increased by setting water guide enlarged portion
The exit velocity of country rock water, can fast and effeciently reduce the water pressure of tunnel-surrounding.
(4) after by leading note pipe water guide release, the grouting for water blocking and strength reinforcing of rich water loose wall rock are carried out, and then formed
The lag Load -carring arch of country rock, i.e. three-level supporting, meanwhile, also provide the integrated solution party of a set of draining release, sealing, reinforcing
Case.
(5) the utility model is by laying advanced Load -carring arch, passive Load -carring arch and lag Load -carring arch, thus multistage, multiple
Level carries out coordination with the synthesis supporting to after digging to before rich water sandy gravel stratum tunnel initating, in digging, not only takes full advantage of country rock
The bearing capacity of itself actively reduces country rock water pressure, at the same played again I-steel grille frame Gao Gang, high-bearing capacity it is excellent
Point avoids the generation of rich water sandy gravel stratum fall of ground, the disasters such as side that collapse, has efficiently controlled adjoining rock stability.This method for
The supporting of rich water soft rock, loose wall rock underground engineering also has stronger applicability.
Detailed description of the invention
Fig. 1 is that the utility model completes the multilevel hierarchy supporting cross-section diagram after construction；
Fig. 2 is tunnelling sectional view in the utility model；
Fig. 3 is the structural schematic diagram of I-steel grille frame in the utility model；
Fig. 4 is the structural schematic diagram of I-steel grid modules in the utility model；
Fig. 5 is the structural schematic diagram of the advanced Short bolt of self-drilling type in the utility model；
Fig. 6 is the structural schematic diagram that note pipe is led in the utility model；
Fig. 7 is the schematic diagram of lag grouting in the utility model.
In figure: 1, advanced Load -carring arch, 2, lag Load -carring arch, 3, passive Load -carring arch, 4, the advanced Short bolt of mining self-drilling type, 5,
Seam crossing, 6, I-steel grille frame, 7, lead note pipe, 8, reinforcing layer, 9, tunnel, 10, driving face, 11, top plate, 12, the
One step, 13, second step, 14, third step, 15, bottom plate, 16, I-steel grid modules, 17, I-steel, 18, bolt,
19, fastening nut, 20, backing plate, 21, hollow anchor bar body, 22, ring taps, 23, fluidised form water-proof adhesive, 24, overflow hole, 25, brill
Head, 26, water guide enlarged portion, 27, screw thread mouth, 28, strainer, 29, strip-shaped hole, 30, taper top guide, 31, pressure gauge, 32, grouting valve
Door, 33, non-return valve, 34, slip casting hose, 35, quick coupling, 36, section slurry device, 37, mouthpiece.
Specific embodiment
The utility model is described in further detail below.
As shown, a kind of multilevel hierarchy suspension device for rich water sandy gravel stratum tunnel, including advanced Load -carring arch 1, quilt
Dynamic Load -carring arch 2 and lag Load -carring arch 3,
The advanced Load -carring arch 1 is by multiple mining advanced Short bolts 4 of self-drilling type along the drilling of roadway's sides and back
Composition is laid, the mining advanced Short bolt 4 of self-drilling type includes hollow anchor bar body 21, ring taps 22, drill bit 25,19 and of fastening nut
Backing plate 20, is equipped with hollow cavity inside the drill bit 25, drill bit 25 be fixed on the front end of hollow anchor bar body 21 and hollow cavity with it is hollow
The inside of anchor bar body 21 is connected to, and opens up multiple overflow holes 24 being connected to hollow cavity on 25 side wall of drill bit, outside hollow anchor bar body 21
Surface is equipped with screw thread, and drill bit 25 and part hollow anchor bar body 21 are in drilling, and the tail end of hollow anchor bar body 21 is outer in drilling,
22 sets of ring taps in 21 outer surface of hollow anchor bar body in drilling, 20 sets of backing plate hollow anchor bar body 21 tail end and by tight
Gu nut 19 is pressed on the wall around drilling, fluidised form water-proof adhesive is housed inside the hollow anchor bar body 21 in drilling
23；
The passive Load -carring arch 3 is I-steel grille frame 6, and I-steel grille frame 6 is along roadway's sides and back
Domed arrangement, the I-steel grille frame 6 are made up of multiple I-steel grid modules 16 connection of bolt 18, I-steel
Grid modules 16 are grid structure, are welded to form in a crisscross manner by multiple I-steel 17；
The lag Load -carring arch 2 leads dispensing device and reinforcing layer 8 forms by multiple, and multiple dispensing devices of leading are laid in I-shaped respectively
In steel grating bracket 6 in the wall in grid gap, reinforcing layer 8 is to solidify formation in dispensing device after slip casting to multiple lead, described
Lead filling be set to equipped with taper top guide 30 leading note pipe 7, lead note pipe 7 side wall on open up multiple strip-shaped holes 29, multiple strip-shaped holes
29 lead the side wall for infusing pipe 7 in quincunx be distributed in, and the taper top guide 30 for leading note pipe 7 is in wall, at the tail end for leading note pipe 7
In outside wall.
It further, further include water guide enlarged portion 26, the tail end for leading note pipe 7 opens up screw thread mouth 27, the water guide enlarged portion 26
For reducer pipe, the lesser one end of diameter is fixedly connected by screw thread mouth 27 with note pipe 7 is led.It can be improved using water guide enlarged portion 26
Quick water guide release to country rock underground water, provides advantage for surrounding rock supporting.
It further, further include strainer 28, the strainer 28 is wrapped in the outside for leading note pipe 7.It can be prevented using strainer 28 broken
Stone silt flows into strip-shaped hole 29 with water, causes hole plug.
The construction method of the utility model, specific steps are as follows:
I, the advanced Load -carring arch 1 of construction:
(1) it determines the length of hollow anchor bar body 21 in the advanced Short bolt 4 of mining self-drilling type: being joined according to rock property, mechanics
Number carries out numerical value calculating, the final anchor pole for determining that supporting effect is optimal to anchorage length needed for the advanced Short bolt of mining self-drilling type 4
Length chooses 1.5m or so under normal circumstances；
(2) front end external diameter and rear end outer diameter of drill bit 25 in the advanced Short bolt 4 of mining self-drilling type are determined: using various outer diameter
Drill bit 25 carries out scene drilling test, determines outside diameter, general condition lower front end outside diameter d according to the optimal effectiveness actually crept into
22~25mm, rear end nominal outside diameter D is taken to take 25~38mm according to contact country rock area；
(3) hole location for laying the advanced Short bolt 4 of mining self-drilling type above driving face 10 according to construction drawing carries out mark
Note determines that hole interdigit array pitch, generally 0.2~0.5m of spacing, array pitch are 0.5~1.2m by country rock situation, arranges 2~3 rows；
(4) the fluidised form waterproof that filling is wrapped up using film in the hollow anchor bar body 21 of the advanced Short bolt 4 of mining self-drilling type
Binder 23, while ring taps 22 is arranged in 21 outer surface of hollow anchor bar body；
(5) the advanced Short bolt of mining self-drilling type 4 is crept into using mining-drilling machine, drilling inclination angle is 3 °~10 °, it is ensured that
The tail end protruded length of drilling to completion, the mining advanced Short bolt 4 of self-drilling type is moderate；
(6) tail portion of the advanced Short bolt 4 of mining self-drilling type is connected with down-hole high pressure air hose, is made in the body of rod by high wind pressure
The film breaks of fluidised form water-proof adhesive 23 are wrapped up, then fluidised form water-proof adhesive 23 terminates in ring taps 22 along the outflow of overflow hole 24
It sets, country rock body is anchored with anchor rod anchored section by the bonding of fluidised form water-proof adhesive 23；
(7) after the advanced Short bolt 4 of mining self-drilling type reaches design anchor force, in the advanced Short bolt 4 of mining self-drilling type
Backing plate 20 and fastening nut 19 are installed in tail portion, then apply pretightning force using torque wrench, and guarantee that pre-tightening force value reaches predetermined
Size anchors Rock And Soil in range and just forms advanced Load -carring arch 1 after all mining advanced Short bolts 4 of self-drilling type are installed.
(8) first step 12, second step 13 and third step 14 are successively excavated；It is true in view of the loose rich water of country rock
It ensures safety, takes short cyclic advance about 1.2m/ days；
II, the passive Load -carring arch 3 of construction:
A, using I-steel 17, setting is welded into vault, spandrel and side portion's different location, different degree of flexibilities in a crisscross manner
I-steel grid modules, the I-steel grid modules 16 that ground processes then are transported into driving face 10；
B, the gunite concrete in the established wall of advanced Load -carring arch 1, then passes through I-steel grid modules 16
Bolt 18 is connected with each other after (and ensuring that the seam crossing 5 of I-steel grid modules 16 is smooth) formation I-steel grille frame 6 through mixed
Solidifying soil is fixed in wall, to form passive Load -carring arch 3；
III, construction lag Load -carring arch 2:
A, the water guide release stage:
1. the note pipe 7 of leading used is made of metal material or high strength plastics, diameter is 25~45mm, and long 1.0~2.0m is led
It infuses and opens up multiple strip-shaped holes 29 on the side wall of pipe 7, multiple strip-shaped holes 29 lead the side wall for infusing pipe 7 in quincunx be distributed in；
2. arrangement leads note pore position on design water guide and the drift section of reinforcing, spacing is 0.8~1.4m, array pitch
For 1.2~2.0m, 40~65mm of bore diameter, depth is 0.7~1.8m, is existed through the grid gap of I-steel grille frame 6
It drills in hole location；
3. matching and leading what note 7 outer diameter of pipe was adapted according to the seepage discharge test data of drift section different parts
Then water guide enlarged portion 26 is leading note 7 outer wall of pipe, one layer of strainer 28 of package, is preventing rubble silt from flowing into hole with water, cause
Hole plug；
4. will lead note pipe 7 is inserted into the above-mentioned drilling opened up, make the exposed 10~15cm of water guide enlarged portion 26, and with timber wedge plug
The gap for entering water guide enlarged portion 26 Yu country rock prevents from leading note pipe 7 and loosens, and the water inside country rock converges along strip-shaped hole 29 into leading note pipe
7 are discharged to ditch or other captations again；Due to being provided with the water guide enlarged portion 26 of variable diameter on conduit pipe, and then realize
The quick water guide release of country rock underground water, provides advantage for surrounding rock supporting；
B, ejection for water plugging and molding reinforcing stage:
A, after completing water guide stress-relief process, water guide enlarged portion 26 and strainer 28 are removed, utilize mouthpiece 37, fast quick access
First 35, slurry device 36 is cut, slip casting hose 34 is connect with the tail end for leading note pipe 7；
B, carried out before slip casting pressure water test experiments, check piping connection it is whether correct, pressure gauge 31, slip casting valve 32,
Whether non-return valves 33 etc. are working properly, prevent plugging, running pulp, spillage；
C, to the note inflation of pipe 7 is led, the blowing pressure is greater than the 1/2 of grouting pressure, connects section expansion of slurry device 36 closely with hole wall
Touching prevents slip casting liquid from backflowing along hole wall gap and portals outside；
D, after the grouting serous fluid for first preparing known formulations, non-return valve 33 is opened, slip casting valve 32 starts slip casting, grouting pressure
For 1.8~2.5MPa, slurries are entered from slip casting hose 34 leads note pipe 7, and the hole of country rock body is flowed out and penetrated into from strip-shaped hole 29
In gap, crack；And then realize loose wall rock sealing, reinforce, promote country rock itself bearing capacity；
E, it when the grouting pressure that pressure gauge 31 indicates gradually rises to design grouting pressure, is terminated after continuing slip casting 10min
Slip casting successively tears slip casting hose 34, mouthpiece 37, quick coupling 35 etc. open after completing all mortar depositing constructions for leading note 7 point of pipe
It removes, the construction of lag Load -carring arch 2 is completed after grout cures.
Claims (3)
1. a kind of multilevel hierarchy suspension device for rich water sandy gravel stratum tunnel, which is characterized in that including advanced Load -carring arch, passively
Load -carring arch and lag Load -carring arch,
The advanced Load -carring arch is by multiple mining advanced Short bolts of self-drilling type along the drilling laying group of roadway's sides and back
It include hollow anchor bar body, ring taps, drill bit, fastening nut and backing plate at, the mining advanced Short bolt of self-drilling type, in the drill bit
Portion is equipped with hollow cavity, and drill bit is fixed on the front end of hollow anchor bar body and hollow cavity is connected to the inside of hollow anchor bar body, drill bit side
Multiple overflow holes being connected to hollow cavity are opened up on wall, hollow anchor bar external surface is equipped with screw thread, drill bit and part hollow anchor pole
Body is in drilling, and the tail end of hollow anchor bar body is in outside drilling, and ring taps is covered in the hollow anchor bar external surface in drilling,
The wall that backing plate covers the tail end in hollow anchor bar body and is pressed on around drilling by fastening nut, it is hollow in drilling
Fluidised form water-proof adhesive is housed inside anchor bar body；
The passive Load -carring arch is I-steel grille frame, and I-steel grille frame is along roadway's sides and the domed cloth of back
It sets, the I-steel grille frame is bolted by multiple I-steel grid modules and is formed, and I-steel grid modules are net
Format structure is welded to form in a crisscross manner by multiple I-steel；
The lag Load -carring arch leads dispensing device and reinforcing layer forms by multiple, and multiple dispensing devices of leading are laid in I-shaped steel grating respectively
In bracket in the wall in grid gap, reinforcing layer is to solidify formation in dispensing device after slip casting to multiple lead, described to lead dispensing device
To lead note pipe equipped with taper top guide, leads and open up multiple strip-shaped holes on the side wall of note pipe, multiple strip-shaped holes are distributed in quincunx
The side wall for leading note pipe, the top guide for leading note pipe are in wall, and the tail end for leading note pipe is in outside wall.
2. the multilevel hierarchy suspension device according to claim 1 for rich water sandy gravel stratum tunnel, which is characterized in that also wrap
Water guide enlarged portion is included, the tail end for leading note pipe opens up screw thread mouth, and the water guide enlarged portion is reducer pipe, and the lesser one end of diameter is logical
It crosses screw thread mouth and is fixedly connected with note pipe is led.
3. the multilevel hierarchy suspension device according to claim 1 for rich water sandy gravel stratum tunnel, which is characterized in that also wrap
Strainer is included, the strainer is wrapped in the outside for leading note pipe.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821133281.8U CN208502786U (en) | 2018-07-17 | 2018-07-17 | Multilevel hierarchy suspension device for rich water sandy gravel stratum tunnel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201821133281.8U CN208502786U (en) | 2018-07-17 | 2018-07-17 | Multilevel hierarchy suspension device for rich water sandy gravel stratum tunnel |
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| CN208502786U true CN208502786U (en) | 2019-02-15 |
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ID=65289446
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| CN201821133281.8U Expired - Fee Related CN208502786U (en) | 2018-07-17 | 2018-07-17 | Multilevel hierarchy suspension device for rich water sandy gravel stratum tunnel |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108678772A (en) * | 2018-07-17 | 2018-10-19 | 湖南科技大学 | A kind of multilevel hierarchy suspension device and its construction method for rich water sandy gravel stratum tunnel |
| CN111911195A (en) * | 2020-08-05 | 2020-11-10 | 湖南科技大学 | Regenerated top plate control method for determining optimal cementation time of critical block cracks |
-
2018
- 2018-07-17 CN CN201821133281.8U patent/CN208502786U/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108678772A (en) * | 2018-07-17 | 2018-10-19 | 湖南科技大学 | A kind of multilevel hierarchy suspension device and its construction method for rich water sandy gravel stratum tunnel |
| CN111911195A (en) * | 2020-08-05 | 2020-11-10 | 湖南科技大学 | Regenerated top plate control method for determining optimal cementation time of critical block cracks |
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