CN109778851A - Construction method of multi-stage expandable carrier bag grouting prestressed anchor rod - Google Patents
Construction method of multi-stage expandable carrier bag grouting prestressed anchor rod Download PDFInfo
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- CN109778851A CN109778851A CN201910126185.3A CN201910126185A CN109778851A CN 109778851 A CN109778851 A CN 109778851A CN 201910126185 A CN201910126185 A CN 201910126185A CN 109778851 A CN109778851 A CN 109778851A
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- 238000010276 construction Methods 0.000 title claims abstract description 23
- 238000005553 drilling Methods 0.000 claims abstract description 24
- 238000009434 installation Methods 0.000 claims abstract description 8
- 238000004140 cleaning Methods 0.000 claims abstract description 6
- 238000004873 anchoring Methods 0.000 claims abstract description 4
- 238000004519 manufacturing process Methods 0.000 claims abstract description 4
- 239000002002 slurry Substances 0.000 claims description 16
- 239000007787 solid Substances 0.000 claims description 12
- 238000003466 welding Methods 0.000 claims description 11
- 239000004568 cement Substances 0.000 claims description 9
- 239000000463 material Substances 0.000 claims description 9
- 238000000034 method Methods 0.000 claims description 8
- 238000005260 corrosion Methods 0.000 claims description 5
- 239000000945 filler Substances 0.000 claims description 5
- 239000011440 grout Substances 0.000 claims description 3
- 238000002955 isolation Methods 0.000 claims 5
- 229920000297 Rayon Polymers 0.000 claims 1
- 239000000853 adhesive Substances 0.000 claims 1
- 230000001070 adhesive effect Effects 0.000 claims 1
- 230000003014 reinforcing effect Effects 0.000 claims 1
- 238000007569 slipcasting Methods 0.000 abstract description 37
- 239000002689 soil Substances 0.000 abstract description 4
- 238000010586 diagram Methods 0.000 description 7
- 229920002472 Starch Polymers 0.000 description 3
- 229910000831 Steel Inorganic materials 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 235000019698 starch Nutrition 0.000 description 3
- 239000010959 steel Substances 0.000 description 3
- 239000003351 stiffener Substances 0.000 description 3
- 230000006835 compression Effects 0.000 description 2
- 238000007906 compression Methods 0.000 description 2
- 230000002708 enhancing effect Effects 0.000 description 2
- 239000004744 fabric Substances 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000008107 starch Substances 0.000 description 2
- 238000009955 starching Methods 0.000 description 2
- 241000537371 Fraxinus caroliniana Species 0.000 description 1
- 235000010891 Ptelea trifoliata Nutrition 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000005494 condensation Effects 0.000 description 1
- 238000009833 condensation Methods 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 238000002513 implantation Methods 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 230000005855 radiation Effects 0.000 description 1
- 230000035807 sensation Effects 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
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- Piles And Underground Anchors (AREA)
Abstract
The present invention relates to a kind of expansible supporting body pouch slip casting prestressed anchor construction methods of multistage, it is characterized in that, after drilling, the dispersed pressure anchor made in advance is placed in hole, several expansible supporting bodies are installed on anchor pole, and are wrapped up with pouch, once grouting then is carried out to drilling, expanded body is unfolded step by step after reaching some strength, finally carries out pouch slip casting and secondary grouting and anchorage cable stretching；The construction method include drilling and forming hole and borehole cleaning, the production of expansible supporting body and installation, Grouting Pipe and pouch installation, anchor cable decentralization, once grouting, expanded body extend step by step, pouch slip casting and secondary grouting, anchorage cable stretching and anchoring.Expansible supporting body can be unfolded in corresponding soil layer in the present invention, increase the contact area with the soil body, improve anchor force, reduce rock-bolt length and spacing, reduce cost, economize on resources.
Description
Technical field
The present invention relates in slope protection project prestressed anchor construction more particularly to a kind of expansible supporting body of multistage
The construction method of pouch slip casting prestressed anchor.
Background technique
Prestressed anchor is widely used in the engineerings such as side slope protection, foundation pit enclosure, can be divided into according to stress transfer mode
Tension type prestressed anchor and pressure-type prestressed anchor.Traditional tension type anchor pole starches solid and anchor under tensile load effect
Bond stress distribution between bar is uneven, be easy to cause stress concentration phenomenon, and the tensile stress generated in slurry solid to starch solid
Drawing crack destroys, and influences the pull-out ultimate capacity of anchor pole.Especially under the conditions of Unfavorable geology, to reach design anchor force, need to add
Long anchor pole reduces anchor pole spacing, and the loss of material and underground environment is thus brought to influence.And pressure type anchor rod is used, especially
The pulling capacity of anchor rod body can be dispersed the pressure for being converted into slurry solid, make full use of slurry solid preferable by dispersed pressure anchor
Crushing resistance, but the mode of conventional implantation supporting body is limited to the pull-out ultimate capacity for improving anchor pole, and the construction of supporting body
Quality requirement is very high, once can't meet the quality requirement, often its bearing capacity can not show a candle to corresponding tension type anchor pole.
Summary of the invention
The problem of it is an object of the invention to for the construction of existing prestressed anchor, proposing a kind of multistage can expand
Supporting body construction prestressed cable method is opened up, is adopted the following technical solutions.
Multistage expansible supporting body prestressed anchor construction method, which is characterized in that including following construction procedure:
S1, drilling and forming hole and borehole cleaning: carrying out cloth hole and drilling and forming hole by the spacing of wells of design, set up crosshead, and telephone-moving is in place,
And locked drilling machine with fastener, guarantee that drilling machine does not have biggish shaking in drilling process；
S2, the production of expansible supporting body and anchor cable assembling:
S2.1, the processing of expansible supporting body and assembling are carried out, through hole is set in expanded body top end plate and bottom plate, in through hole
Disrance sleeve is penetrated, is welded to connect with end plate and bottom plate, end plate lower weld four is to set square, and setting turns between each pair of set square
Axis installs one piece of guide plate by shaft between two pieces of set squares, and welded end plate is the same as diameter annular block, shape between each pair of set square
At sleeve；
S2.2, guide plate top are connected to sleeve and end plate by shaft, under a bushing portion, pintongs of the welding with diameter on the outside of guide plate
Expansion board, the equidistant welding stiffener enhancing extension panel stiffness in expansion board inside, guide plate lower part certain distance weld several piece radiation
Shape telescopic backboard has sliding block card slot on telescopic backboard, keeps expanded body not unfolded under not by external force；
S2.3, sliding block include sliding block upper plate and sliding block lower plate, are connected into sliding block upper plate and sliding block lower plate with sliding block connecting cylinder whole
Body enhances sliding block overall stiffness in sliding block connecting cylinder surrounding eight pieces of ribs of uniform welding；
S2.4, the corresponding position that the expanded body being completed is installed to level-one anchor cable, second level anchor cable, three-level anchor cable, and with anti-
Rotten cement casing filler material is filled the gap of disrance sleeve and anchor cable；
S3, Grouting Pipe and pouch installation:
S3.1, it is responsible in the installation pouch slip casting of expanded body center, inside expanded body, pouch is installed on pouch slip casting supervisor
Slip casting horizontal branch pipe；
S3.2, pouch being covered outside expanded body, pouch top and the bottom are fixed at the pouch card slot of end plate and bottom plate by garter spring,
And the air in pouch is extracted by pouch slip casting supervisor and pouch slip casting horizontal branch pipe, and blocks on pouch slip casting supervisor
Mouthful；
S3.3, uniformly placed on prestressed anchor to middle bracket, outside expanded body, the fixed once grouting pipe of centering bracket and
Secondary grouting pipe；
S4, anchor cable decentralization: will be put into hole under anchor cable in time after the completion of drilling borehole cleaning, expansible anchor cable moved at hole location, according to
Design inclination angle, orientation it is artificial smooth, it is continuous promote, by sliding into hole under the self weight of anchor cable body and inertia；
S5, once grouting: once grouting pipe progress common pressure grouting, once grouting pipe will be passed through by configured cement grout as required
From hole-bottom slurry-injection, until slurries flow to aperture, once grouting pipe is at the uniform velocity extracted during slip casting；
S6, expanded body extend step by step: after the slurry solid that slip casting is formed reaches prescribed strength, with jack pair two at aperture
Three-level anchor cable carries out tensioning, and three-level anchor cable band movable slider moves up, and the sliding block upper plate on final sliding block is moved to non-return card slot
Place cannot move again, stop tensioning at this time, and three-level anchor cable is tentatively fixed on anchor plate；According to above-mentioned steps gradually by second level
Anchor cable, level-one anchor cable and corresponding expanded body are extended；
S7, pouch slip casting and secondary grouting: horizontal by pouch slip casting supervisor, pouch slip casting after expansible body all extension
Branch pipe and secondary grouting pipe successively carry out slip casting, and the secondary grouting time determines according to live cement slurry condensation situation, the slip casting time
Interval is appropriately extended, grouting pressure > 2.0MPa；
S8, anchorage cable stretching and anchoring: after the compression strength for starching solid reaches the 75% of design strength, classification is carried out to anchor cable
It draws, every grade is incremented by by designing prestressed 25%, and every grade of stable 5min, afterbody ultra stretching 110% simultaneously stablizes 20 ~ 30min, so
After lock, close anchor head.
Preferably, expanded body is made of upper end plate, middle part guide plate and expansion board, lower part expanded body bottom plate and bottom plate, end
Plate and bottom plate are equipped with through hole corresponding with anchor cable and pouch slip casting general pipeline.
Preferably, sleeve is arranged at end plate lower part, and sleeve is pintongs ring bodies, and ring bodies is discontinuous at guide plate and set square,
Guarantee that guide plate can rotate freely.
Preferably, for sliding block among four pieces of guide plates, anchor cable is fixed on the welding block in sliding block lower plate, sliding block by disrance sleeve
Non-return card slot can be moved upward to by anchor cable, moving up for sliding block is turned out guide plate, finally makes expanded body at expansion shape
State.
Preferably, disrance sleeve and anchor cable gap are filled with anti-corrosion cement casing filler material, anchor cable and disrance sleeve it is upper
Lower end is fixed by tied silk.
Preferably, level-one anchor cable, second level anchor cable, three-level anchor cable are in end plate and to symmetrical, anchor cable series on middle bracket
And expanded body number is determined according to actual formation situation, is not limited to three-level.
The beneficial effects of the present invention are:
1, pressure dispersing type non-bonded anchorage cable is reduced tension process, reduces construction period, had using classification otherness tensioning
Effect accelerates anchor cable construction progress；
2, expansible supporting body can be unfolded in corresponding soil layer, increase the contact area with the soil body, improve anchor force；
3, anchor force is improved after expansible supporting body extension, can accordingly reduces the distance between the length or anchor pole of anchor pole,
The usage amount for reducing anchor cable, reduces cost；
4, pouch wraps up expansible supporting body, reduces contact of the expansible supporting body with underground water, improving can expand
Open up the service performance and safety of supporting body；
5, it is cased with disrance sleeve outside the anchor cable among expansible supporting body, it is viscous with waterproof anti-corrosion between disrance sleeve and anchor cable
Material is filled, and slurries will not flow out pouch during slip casting, and slip casting effect is good.
Detailed description of the invention
Fig. 1 is multistage expansible supporting body prestress anchorage cable structure chart；
Fig. 2 is multistage expansible supporting body and anchor cable assembling figure；
Fig. 3 is certain grade of supporting body detail of construction；
Fig. 4 is detail drawing after certain grade of supporting body extension；
Fig. 5 is A-A sectional view in Fig. 2；
Fig. 6 is B-B sectional view in Fig. 2；
Fig. 7 is C-C sectional view in Fig. 2；
Fig. 8 is guide plate, sleeve, set square connection schematic diagram；
Fig. 9 is guide plate, expansion board connection schematic diagram；
Figure 10 is guide plate, expansion board connection three-dimensional figure one；
Figure 11 is guide plate, expansion board connection three-dimensional figure one；
Figure 12 is slide block structure figure；
Figure 13 is sliding block sectional view (D-D section)；
Figure 14 is the structural schematic diagram after the completion of step 1；
Figure 15 is the structural schematic diagram after the completion of step 4；
Figure 16 is the structural schematic diagram after the completion of step 5；
Figure 17 is the structural schematic diagram after the completion of step 6；
Figure 18 is the structural schematic diagram after the completion of step 7.
It is marked in figure: 1- slope protection, 2- drilling, 31- level-one anchor cable, 32- second level anchor cable, 33- three-level anchor cable, 41- end plate,
42- sleeve, 43- guide plate, 44- expansion board, 45- telescopic backboard, 46- bottom plate, 47- set square, 48- stiffener, 49- separation sleeve
Pipe, 410- shaft, 411- non-return card slot, 412- sliding block card slot, 5- pouch, 6- pouch card slot, 7- sliding block, 71- sliding block upper plate,
72- sliding block lower plate, 73- sliding block connecting cylinder, 74- ribs, 8- through hole, 9- centering bracket, 10- anchor head, 11- anchor plate, 12-
Starch solid, 13- welding block, 14- once grouting pipe, 15- secondary grouting pipe, 161- pouch slip casting supervisor, 162- pouch slip casting level
Branch pipe, 17- casing filler material.
Specific embodiment
In order to deepen the understanding of the present invention, below with reference to Fig. 1 to Figure 18, the embodiment of the present invention is made specifically
Bright, following embodiment is implemented under the premise of the technical scheme of the present invention, gives detailed embodiment, but the present invention
Protection scope be not limited to the following embodiments.
Drilling (2) depth is 20m, and bore diameter 15cm, expanded body height is 30cm, diameter 10cm, anchor cable use
Prestressed anchor rope with pressure dispersing, by Unit three, totally six beam steel strand wires form every hole anchor cable, steel strand wires using diameter 15.24mm,
A centering bracket is arranged along the every 1.5m of body of rod axis direction in the high strength low relaxed non-bending steel cable of intensity 1860MPa
(9), level-one anchor cable (31) long 10m, second level anchor cable (32) long 15m, three-level anchor cable (33) long 19.5m, injecting paste material is using water ash
Neat slurry than 0.45 ~ 0.50.Drilling tool uses TY210, and is equipped with corresponding tensioning equipment.
For the expansible supporting body pouch slip casting prestressed anchor construction of above-mentioned multistage, the present invention uses following construction procedure
(Figure 14 ~ Figure 18):
S1, drilling and forming hole and borehole cleaning: carrying out cloth hole and drilling and forming hole by the spacing of wells of design, set up crosshead, and telephone-moving is in place,
And locked drilling machine with fastener, guarantee that drilling machine does not have biggish shaking in drilling process, as shown in figure 14；
S2, the production of expansible supporting body and anchor cable assembling:
S2.1, expansible supporting body processing and assembling are carried out, through hole is set on expanded body top end plate (41) and bottom plate (46)
(8), disrance sleeve (9) are penetrated in through hole (8), is welded to connect with end plate (41) and bottom plate (46), end plate (41) lower weld
Shaft (410) are arranged between each pair of set square (47) in four pairs of set squares (47), are installed between two pieces of set squares by shaft (410)
One piece of guide plate (43), welded end plate is formed sleeve (42) with diameter annular block between each pair of set square (47)；
S2.2, guide plate (43) top are connected to sleeve (42) and end plate (41) by shaft (410), in sleeve (42) lower part, lead
Pintongs expansion board (44) of the welding with diameter, equidistant welding stiffener (48) the enhancing expansion in expansion board (44) inside on the outside of plate (43)
Panel rigidity, guide plate (43) lower part certain distance weld the radial telescopic backboard of several piece (45), and telescopic backboard has sliding block on (45)
Card slot (412) keeps expanded body not unfolded under not by external force, as shown in Fig. 9 ~ Figure 11；
S2.3, sliding block (7) include sliding block upper plate (71) and sliding block lower plate (72), with sliding block connecting cylinder (73) by sliding block upper plate (71)
It is integral with sliding block lower plate (72) connection, in eight pieces of ribs (74) of sliding block connecting cylinder (73) surrounding uniform welding, enhance sliding block
Overall stiffness, as shown in Figure 12 and Figure 13；
S2.4, the expanded body being completed is installed to level-one anchor cable (31), second level anchor cable (32), three-level anchor cable (33) it is corresponding
Position, and be filled with gap of the anti-corrosion cement casing filler material (17) to disrance sleeve (49) and anchor cable；
S3, Grouting Pipe and pouch installation:
S3.1, (161) are responsible in the installation pouch slip casting of expanded body center, inside expanded body, (161) are responsible in pouch slip casting
Upper installation pouch slip casting horizontal branch pipe (162)；
S3.2, pouch (5) is covered outside expanded body, pouch top and the bottom are fixed on end plate (41) and bottom plate (46) by garter spring
At pouch card slot (6), and the air in pouch (5) is passed through into pouch slip casting supervisor (161) and pouch slip casting horizontal branch pipe (161)
Abstraction, and it is suitable for reading to block pouch slip casting supervisor (161)；
S3.3, it is uniformly placed on prestressed anchor to middle bracket (9), outside expanded body, the fixed primary note of centering bracket (9)
Slurry pipe (14) and secondary grouting pipe (15)；
S4, anchor cable decentralization: it will be put into hole under anchor cable in time after the completion of drilling (2) borehole cleaning, expansible anchor cable is moved at hole location, is pressed
According to design inclination angle, artificial smooth, the continuous propulsion in orientation, by hole is slid under the self weight of anchor cable body and inertia, as shown in figure 15；
S5, once grouting: once grouting pipe progress common pressure grouting, once grouting pipe will be passed through by configured cement grout as required
From hole-bottom slurry-injection, until slurries flow to aperture, once grouting pipe (14) is at the uniform velocity extracted during slip casting, as shown in figure 16；
S6, expanded body extend step by step: after the slurry solid (12) that slip casting is formed reaches prescribed strength, jack pair is used at aperture
Two three-level anchor cables (33) carry out tensioning, and three-level anchor cable (33) band movable slider (7) moves up, the sliding block on final sliding block (7)
Upper plate (71) is moved at non-return card slot (411) and cannot move again, stops tensioning at this time, and three-level anchor cable (33) is tentatively fixed on
On anchor plate (11)；Gradually second level anchor cable (32), level-one anchor cable (31) and corresponding expanded body are expanded according to above-mentioned steps
Exhibition, as shown in figure 17；
S7, pouch slip casting and secondary grouting: after expansible body all extension, (161), pouch slip casting are responsible for by pouch slip casting
Horizontal branch pipe (162) and secondary grouting pipe (15) successively carry out slip casting, and the secondary grouting time condenses situation according to live cement slurry
Determine, slip casting time interval is appropriately extended, grouting pressure > 2.0MPa, as shown in figure 18；
S8, anchorage cable stretching and anchoring: after the compression strength for starching solid (12) reaches the 75% of design strength, anchor cable is divided
Grade tensioning, every grade is incremented by by designing prestressed 25%, every grade of stable 5min, afterbody ultra stretching 110% and stablize 20 ~
Then 30min is locked, close anchor head (10).
Fig. 5 ~ Fig. 7, be respectively primary expansion body, secondary expansion body, three-level expanded body end plate sectional view, expanded body is by upper
Portion's end plate (41), middle part guide plate (43) and expansion board (44), lower part expanded body bottom plate (45) and bottom plate (46) composition, end plate (41)
Diameter is 10cm, has identical hole location on every grade of end plate (41), has on level-one end plate six roots of sensation disrance sleeve (49), on second level end plate
There are four disrance sleeves (49), three-level end plate there are two disrance sleeves (49), and disrance sleeve (49) outer diameter is 2.5cm；Fig. 8 ~ figure
11 be guide plate (43) and sleeve (42), expansion board (44), the connection of set square (47), and end plate lower part has sleeve (42), set
Cylinder (42) is pintongs ring bodies, and ring bodies is discontinuous at guide plate (43) and set square (47), guarantees that guide plate (43) can be free
Rotation；Figure 11 ~ Figure 12, sliding block (7) include sliding block upper plate (71) and sliding block lower plate (72), sliding block upper plate (71) diameter 7cm, sliding block
Lower plate (72) diameter 7.5cm, sliding block (7) is intermediate in four pieces of guide plates (43), and anchor cable is fixed under sliding block by disrance sleeve (49)
Welding block (13) on plate (72), sliding block (7) can be moved upward to non-return card slot (411) by anchor cable, and moving up for sliding block (7) makes
Guide plate (43) is turned out, and finally makes expanded body at unfolded state.
Above-described embodiment is only used for illustrating technical concept of the invention, rather than the restriction to rights protection of the present invention,
It is all to be made a non-material change to the present invention using this design, protection scope of the present invention should all be fallen into.
Claims (6)
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Cited By (10)
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| CN111676967A (en) * | 2020-06-19 | 2020-09-18 | 中建富林集团有限公司 | Construction method for pile-anchor support of spiral cage core anchor rod |
| CN112160782A (en) * | 2020-09-30 | 2021-01-01 | 辽宁工程技术大学 | Multi-stage retractable anti-falling anchor rod structure and using method |
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| CN111676967B (en) * | 2020-06-19 | 2021-07-02 | 中建富林集团有限公司 | Construction method for pile-anchor support of spiral cage core anchor rod |
| CN111676967A (en) * | 2020-06-19 | 2020-09-18 | 中建富林集团有限公司 | Construction method for pile-anchor support of spiral cage core anchor rod |
| CN112160782A (en) * | 2020-09-30 | 2021-01-01 | 辽宁工程技术大学 | Multi-stage retractable anti-falling anchor rod structure and using method |
| CN113431517A (en) * | 2021-06-23 | 2021-09-24 | 华能灵台邵寨煤业有限责任公司 | Quick plugging device suitable for multi-aperture cyclic multiplexing orifice |
| CN113969579B (en) * | 2021-09-29 | 2022-12-27 | 华北水利水电大学 | Multistage expansion utricule stock device |
| CN113969579A (en) * | 2021-09-29 | 2022-01-25 | 华北水利水电大学 | Multistage expansion utricule stock device |
| CN114737565B (en) * | 2022-04-29 | 2023-03-03 | 中国矿业大学 | Fully-recyclable distributed end-bearing anchor rod and construction method thereof |
| CN114737565A (en) * | 2022-04-29 | 2022-07-12 | 中国矿业大学 | Fully-recyclable distributed end support anchor rod and construction method thereof |
| CN115125946A (en) * | 2022-05-30 | 2022-09-30 | 广州环投增城环保能源有限公司 | A cascading umbrella-shaped anchor rod |
| CN115341934A (en) * | 2022-07-22 | 2022-11-15 | 广西民族大学 | Anchoring method and structure of anchor rod with enlarged head |
| CN116065580A (en) * | 2023-03-31 | 2023-05-05 | 中冶建筑研究总院有限公司 | High-bearing-capacity multi-bag expansion anchor rod drilling and expanding structure and integrated construction method thereof |
| CN116427402A (en) * | 2023-04-04 | 2023-07-14 | 上海市基础工程集团有限公司 | An anti-floating anchoring device for underground structures |
| CN116623674A (en) * | 2023-06-30 | 2023-08-22 | 南京工业大学 | A foundation pit support device with controllable deformation and its construction method |
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