CN108222032B - A kind of side slope hole soil body prestressed anchor note reinforcement means - Google Patents
A kind of side slope hole soil body prestressed anchor note reinforcement means Download PDFInfo
- Publication number
- CN108222032B CN108222032B CN201810011323.9A CN201810011323A CN108222032B CN 108222032 B CN108222032 B CN 108222032B CN 201810011323 A CN201810011323 A CN 201810011323A CN 108222032 B CN108222032 B CN 108222032B
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- Prior art keywords
- soil body
- grouting
- anchor
- side slope
- slurries
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- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Fee Related
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- 239000002689 soil Substances 0.000 title claims abstract description 60
- 230000002787 reinforcement Effects 0.000 title claims abstract description 20
- 239000002002 slurry Substances 0.000 claims abstract description 43
- 238000007569 slipcasting Methods 0.000 claims abstract description 25
- 239000000463 material Substances 0.000 claims abstract description 15
- 238000003306 harvesting Methods 0.000 claims abstract description 14
- 239000000654 additive Substances 0.000 claims abstract description 13
- 230000000996 additive effect Effects 0.000 claims abstract description 13
- 239000004567 concrete Substances 0.000 claims abstract description 10
- 238000005070 sampling Methods 0.000 claims abstract description 4
- 239000004033 plastic Substances 0.000 claims description 26
- 229920003023 plastic Polymers 0.000 claims description 26
- 239000004568 cement Substances 0.000 claims description 15
- 238000005553 drilling Methods 0.000 claims description 12
- 230000008961 swelling Effects 0.000 claims description 11
- 239000003795 chemical substances by application Substances 0.000 claims description 8
- 238000004873 anchoring Methods 0.000 claims description 6
- 210000004911 serous fluid Anatomy 0.000 claims description 6
- 239000003638 chemical reducing agent Substances 0.000 claims description 3
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 3
- 239000004594 Masterbatch (MB) Substances 0.000 claims description 2
- 229920002472 Starch Polymers 0.000 claims 1
- 235000019698 starch Nutrition 0.000 claims 1
- 239000008107 starch Substances 0.000 claims 1
- 238000010276 construction Methods 0.000 abstract description 6
- 239000011148 porous material Substances 0.000 abstract description 6
- PPTYJKAXVCCBDU-UHFFFAOYSA-N Rohypnol Chemical compound N=1CC(=O)N(C)C2=CC=C([N+]([O-])=O)C=C2C=1C1=CC=CC=C1F PPTYJKAXVCCBDU-UHFFFAOYSA-N 0.000 abstract description 4
- 239000002131 composite material Substances 0.000 abstract description 4
- 238000002347 injection Methods 0.000 abstract description 2
- 239000007924 injection Substances 0.000 abstract description 2
- 239000012466 permeate Substances 0.000 abstract description 2
- 230000003014 reinforcing effect Effects 0.000 description 6
- 230000000694 effects Effects 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000007812 deficiency Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000011440 grout Substances 0.000 description 2
- 230000036316 preload Effects 0.000 description 2
- BPQQTUXANYXVAA-UHFFFAOYSA-N Orthosilicate Chemical compound [O-][Si]([O-])([O-])[O-] BPQQTUXANYXVAA-UHFFFAOYSA-N 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000007596 consolidation process Methods 0.000 description 1
- 230000003467 diminishing effect Effects 0.000 description 1
- 238000001125 extrusion Methods 0.000 description 1
- 239000008187 granular material Substances 0.000 description 1
- 230000036571 hydration Effects 0.000 description 1
- 238000006703 hydration reaction Methods 0.000 description 1
- 238000009533 lab test Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 238000009955 starching Methods 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D17/00—Excavations; Bordering of excavations; Making embankments
- E02D17/20—Securing of slopes or inclines
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D5/00—Bulkheads, piles, or other structural elements specially adapted to foundation engineering
- E02D5/74—Means for anchoring structural elements or bulkheads
- E02D5/76—Anchorings for bulkheads or sections thereof in as much as specially adapted therefor
Landscapes
- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Mining & Mineral Resources (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Paleontology (AREA)
- Civil Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Piles And Underground Anchors (AREA)
- Pit Excavations, Shoring, Fill Or Stabilisation Of Slopes (AREA)
Abstract
The invention discloses a kind of side slope hole soil body prestressed anchors to infuse reinforcement means, it is using dilatancy concrete slurry material as injection slurry, the proportion of injecting paste material additive is determined according to soil body sampling test, then the side slope hole soil body carries out slip casting, when slip casting, the side slope hole soil body carries out three-dimensional prestressing force anchor pouring reinforcement.The present invention is by slip casing by pressure slurries in a manner of filling, permeate and is compacted etc., it drives the moisture and air in soil body hole away and occupies its position, become discontinuous soil body hole continuously, being formed by mesh skeleton, the foramen primum gap soil body of slurries Seed harvest is the composite construction of charges；The side slope hole soil body carries out three-dimensional prestressing force anchor pouring reinforcement, and slurries Seed harvest and the pre-existent pore soil body can be made to form closely knit structure and be in three-dimensional stress, greatly improve side slope hole soil strength, overall stability and bearing capacity improve significantly.
Description
Technical field
The present invention relates to the reinforcement techniques of geotechnical engineering more particularly to side slope.
Background technique
In geotechnical engineering construction, the case where frequently encountering soil type side slope, some belong to initial side slope.Most is initial
Soil side slope belongs to the hole soil body, is in an unsure state, and is unable to satisfy the requirement of engineering construction, needs using extraneous measure
It is reinforced.Current method for reinforcing side slope includes ordinary cement grouting and reinforcing, bolt anchorage, Soil-nailed, prestress anchorage cable
Reinforce etc..The deficiency of ordinary cement grouting and reinforcing is, due to of different sizes in soil aperture, generally hole will be divided into three
Seed type: nonactive hole, capillary pore and ventilating slit.The approximate aperture of nonactive hole is less than 0.002mm, capillary pore
Approximate aperture be 0.002-0.02mm, the approximate aperture of ventilating slit is greater than 0.02mm.Since ordinary cement particle is greater than
0.1mm, so cement granules are difficult to be filled in the small hole of soil when using ordinary cement slip casting；Besides due to
The effect of the ordinary cement slurries heat of hydration has self-constriction, and slurries generate between slurries and pore wall full of meeting after hole solidification
Crack causes to fill leakiness, and grouting consolidation effect weakens.When using anchor pole or prestressed anchor reinforcement merely, since soil is soft
Weak unstable, anchor force is insufficient.Even if slip casting adds combining anchor to reinforce, anchor pouring reinforcement effect is also bad.Therefore, it is necessary to a kind of new
Reinforcement means.
Summary of the invention
In order to overcome the deficiencies of the prior art, the comprehensive dilatancy superfine cement slurries of the present invention and half section of anchoring, half section of preload
Swollen shell-type prestressing force grouting cable anchor, a kind of side slope hole soil body prestressed anchor note reinforcement means is provided.
In order to achieve the above objectives, the technical solution adopted by the present invention is that:
A kind of side slope hole soil body prestressed anchor note reinforcement means, includes the following steps:
One, dilatancy concrete slurry material is determined
Dilatancy concrete slurry material is made of superfine cement and additive；Additive includes swelling agent, efficient diminishing
Agent and accelerator；Slurries ratio of mud when slip casting is 1:0.4-0.6；
Two, the proportion of injecting paste material additive is determined according to soil body sampling test
At the side slope to need reinforcement, hole soil body sample is taken, according to sample porosity type, carries out slip casting examination in laboratory
It tests, the proportion for reaching the injecting paste material additive of following index request is found by grouting test；Index request is as follows: slurries
Swelling stress is 0.5-2.0MPa, and the fluidity of slurries is greater than 29cm, and the presetting period of slurries is 8-12 hours, Seed harvest early stage
Intensity is greater than 16MPa；
Three, the side slope hole soil body carries out slip casting
1, select grouting cable anchor and plastic bushing spare；It is required that grouting cable anchor is swollen shell-type prestressing force grouting cable anchor, slip casting
The length of anchor cable is not less than 15m, can bear the prestressing force of 5-12T；It is required that the length of plastic bushing is long for the half of grouting cable anchor
Degree, the diameter of plastic bushing are matched with the outer diameter of grouting cable anchor；
2, play several drillings on the side slope hole soil body, bore diameter is slightly larger than the outer diameter of plastic bushing, drilling depth with
The length of grouting cable anchor is consistent；
3, plastic bushing is packed into aperture section first after drilling and grouting cable anchor is installed again, or grouting cable anchor is initially charged with modeling
Expect in casing, another rise is fitted into drilling；It is required that installing stop grouting plug in plastic bushing front end, prevent grouting serous fluid from entering plastics
In casing；The front end of grouting cable anchor is fixed on foot of hole by the swollen shell of anchoring piece；And require the flat of anchor cable pallet at aperture
Face area is not less than the 1/4 of shared side slope area, expands anchor cable to the axial pretightening of the hole soil body by increasing tray area
Range；
4, the dilatancy concrete slurry for meeting These parameters requirement, arrangement are prepared according to the experimental result of the first step simultaneously
Grouting pipeline；
5, grouting cable anchor is connect with grouting pipeline, starts slip casing by pressure pump, slip casting, grouting pressure are carried out to the hole soil body
For 0.5-3MPa, stop slip casting when grouting pressure occurs and increasing rapidly, indication slip casting has been expired；
6, after grouting serous fluid reaches the presetting period, pretightning force is applied to grouting cable anchor, prestressd anchor cable is made to reach setting
Value.
7, it is solidified completely to slurries, so that the hole soil body is formed Seed harvest, complete entire engineering section.
The principle of the present invention and good effect:
1, the moisture and air in soil body hole are driven away in a manner of filling, permeate and is compacted etc. by slip casing by pressure slurries
And its position is occupied, make discontinuous soil body hole become continuously, being formed using slurries Seed harvest as mesh skeleton, the foramen primum gap soil body
For the composite construction of charges；
2, since hole earth structure strength is lower, grouting cable anchor and hole wall frictional force are insufficient, when applying prestressing force, then may be used
Directly grouting cable anchor can be pulled out from the soil body；Therefore the present invention using dilatancy concrete slurry carry out grouting and reinforcing, by
Swelling agent is added in slurries, the volume expansion of cement Seed harvest can be promoted to become larger, when the volume expansion of cement grout can be supported
Disappear after self-constriction, continuing increase swelling volume can make slurries generate squeezing action to pore wall, i.e. seif-citing rate acts on, cement grout
Seif-citing rate act in two-dimensional surface, strengthen the frictional force of grouting cable anchor and hole wall, can to grouting cable anchor apply it is biggish
Axial prestress；So the dilatancy cement injection slurries side slope hole soil body generate two-dimensional surface extrusion stress, add
The three-dimensional prestressed reinforcement to the hole soil body is collectively formed in the axial compression stress of prestressing force grouting cable anchor, makes the hole after reinforcing
It is the composite construction of the three-dimensional stress of charges that the gap soil body, which is formed by mesh skeleton, the foramen primum gap soil body of slurries Seed harvest,.
3, since aperture section is provided with plastic bushing, plastic bushing is the 1/2 of cable body length, makes grouting cable anchor and plastic sheath
Pipe can relative motion, pretightning force can be applied, thus formed half section anchoring, half section preload anchor structure.
In short, carrying out three-dimensional prestressing force anchor pouring reinforcement using the method for the present invention side slope hole soil body, slurries calculus can be made
Body and the pre-existent pore soil body form closely knit structure and in three-dimensional stresses, greatly improve side slope hole soil strength,
Overall stability and bearing capacity improve significantly.
Detailed description of the invention
Fig. 1 is side slope hole soil body prestressing force anchor pouring reinforcement schematic diagram of the present invention；
Fig. 2 is the swollen shell-type prestressing force grouting cable anchor structural schematic diagram of the present invention.
In figure, 1, the hole soil body；2, Seed harvest；3, grouting cable anchor；4, stop grouting plug；5, swollen shell anchoring piece；6, anchor cable body；7,
Plastic bushing；8, pallet；9, anchorage.
Specific embodiment
The present invention will be further described below with reference to the drawings.
As shown in Fig. 1 Fig. 2, a kind of side slope hole soil body prestressed anchor note reinforcement means includes the following steps:
One, seif-citing rate injecting paste material is determined
Superfine cement and additive of the dilatancy concrete slurry material by diameter less than 0.4 μm form；Additive includes
Swelling agent, high efficiency water reducing agent and accelerator；Slurries ratio of mud when slip casting is 1:0.4-0.6；
Two, the proportion of injecting paste material additive is determined according to soil body sampling test
At the side slope to need reinforcement, 1 sample of the hole soil body is taken, according to sample porosity type, carries out slip casting in laboratory
Test, the proportion for reaching the injecting paste material additive of following index request is found by grouting test；Index request is as follows: slurries
Swelling stress be 0.5-2.0MPa, the fluidities of slurries is greater than 29cm, and the presetting period of slurries is 8-12 hours, Seed harvest 2
Early strength is greater than 16MPa；
In the present embodiment: take 100 parts by weight of normal silicate superfine cement of 4 μm of average partial size, 11 parts by weight of swelling agent,
0.15 parts by weight of high efficiency water reducing agent, 2.6 parts by weight of accelerator, the slurries ratio of mud are 1:0.5.The index reached are as follows: swelling stress
For 1.4MPa, fluidity 32cm, the presetting period of slurries is 11 hours, and Seed harvest early strength is 18.6MPa；
Swelling agent is made of expansion masterbatch and natural gesso in embodiment.
Three, the side slope hole soil body 1 carries out slip casting
1, select grouting cable anchor 3 and plastic bushing 7 spare；It is required that grouting cable anchor 3 is swollen shell-type prestressing force grouting cable anchor, note
6 length of anchor cable body for starching anchor cable 3 is not less than 15m, can bear the prestressing force of 5-12T；It is required that the length of plastic bushing 7 is slip casting anchor
The diameter of the half length of rope 3, plastic bushing 7 is matched with the outer diameter of grouting cable anchor 3；
2, several drillings are played on the side slope hole soil body 1, bore diameter is slightly larger than the outer diameter of plastic bushing 7, drilling depth
It is consistent with the length of grouting cable anchor 3；
3, plastic bushing 7 is packed into aperture section first after drilling and grouting cable anchor 3 is installed again, or grouting cable anchor 3 is first filled
Enter in plastic bushing 7, another rise is fitted into drilling；It is required that installing stop grouting plug 4 in 7 front end of plastic bushing, grouting serous fluid is prevented
Into in plastic bushing 7；The front end of grouting cable anchor 3 is fixed on foot of hole by swollen shell anchoring piece 5；And require anchor at aperture
The area of plane of rope pallet 8 is not less than a quarter of shared side slope area, expands anchor cable device to hole by increasing 8 area of pallet
The axial pretightening range of the gap soil body 1；
4, the dilatancy concrete slurry for meeting These parameters requirement, arrangement are prepared according to the experimental result of the first step simultaneously
Grouting pipeline；
5, grouting cable anchor 3 is connect with grouting pipeline, starts slip casing by pressure pump, slip casting, slip casting pressure are carried out to the hole soil body 1
Power is 0.5-3MPa, stops slip casting when grouting pressure occurs and increasing rapidly, and indication slip casting has been expired；
6, it after grouting serous fluid reaches the presetting period, is pre-tightened by the pretightning force that anchorage 9 applies 5-12T to grouting cable anchor 3
Power makes prestressd anchor cable reach setting value.
7, it is solidified completely to slurries, the hole soil body 1 is made to form Seed harvest 2.Later period is carried out reinforcing hole soil with scanning electron microscope
The microstructure of body 1 scans observation, and the hole soil body after discovery is reinforced is formed using slurries Seed harvest as mesh skeleton, foramen primum gap soil
Body is the composite construction of the three-dimensional stress of charges.
Claims (2)
1. a kind of side slope hole soil body prestressed anchor infuses reinforcement means, which comprises the steps of:
Step 1 determines dilatancy concrete slurry material
Dilatancy concrete slurry material is made of superfine cement and additive；Additive include swelling agent, high efficiency water reducing agent and
Accelerator, slurries ratio of mud when slip casting are 1:0.4-0.6；
Step 2, the proportion that injecting paste material additive is determined according to soil body sampling test
At the side slope to need reinforcement, hole soil body sample is taken, according to sample porosity type, carries out grouting test in laboratory,
The proportion for reaching the injecting paste material additive of following index request is found by grouting test；Index request is as follows: slurries it is swollen
Swollen stress is 0.5-2.0MPa, and the fluidity of slurries is greater than 29cm, and the presetting period of slurries is 8-12 hours, and Seed harvest early stage is strong
Degree is greater than 16MPa；
Step 3, the side slope hole soil body carry out slip casting
(1) select grouting cable anchor and plastic bushing spare；It is required that grouting cable anchor is swollen shell-type prestressing force grouting cable anchor, grouting cable anchor
Length be not less than 15m, the prestressing force of 5-12T can be born；It is required that the length of plastic bushing is the half length of grouting cable anchor, modeling
The diameter of material casing is matched with the outer diameter of grouting cable anchor；
(2) several drillings are played on the side slope hole soil body, bore diameter is slightly larger than the outer diameter of plastic bushing, drilling depth and slip casting
The length of anchor cable is consistent；
(3) plastic bushing is packed into aperture section first after drilling and grouting cable anchor is installed again, or grouting cable anchor is initially charged with plastics
In casing, another rise is fitted into drilling；It is required that installing stop grouting plug in plastic bushing front end, prevent grouting serous fluid from entering plastic sheath
In pipe；The front end of grouting cable anchor is fixed on foot of hole by the swollen shell of anchoring piece；And require the plane of the anchor cable pallet at aperture
Area is not less than the 1/4 of shared side slope area, expands anchor cable to the axial pretightening model of the hole soil body by increasing tray area
It encloses；
(4) the dilatancy concrete slurry for meeting These parameters requirement, arrangement note are prepared according to the experimental result of the first step simultaneously
Starch pipeline；
(5) grouting cable anchor is connect with grouting pipeline, starts slip casing by pressure pump, slip casting is carried out to the hole soil body, grouting pressure is
0.5-3MPa, stops slip casting when grouting pressure occurs and increasing rapidly, and indication slip casting has been expired；
(6) after grouting serous fluid initial set, pretightning force is applied to grouting cable anchor, prestressd anchor cable is made to reach setting value；
(7) it is solidified completely to slurries, so that the hole soil body is formed Seed harvest, complete entire engineering section.
2. side slope hole soil body prestressed anchor as described in claim 1 infuses reinforcement means, which is characterized in that the swelling agent
It is made of expansion masterbatch and natural gesso.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810011323.9A CN108222032B (en) | 2018-01-05 | 2018-01-05 | A kind of side slope hole soil body prestressed anchor note reinforcement means |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810011323.9A CN108222032B (en) | 2018-01-05 | 2018-01-05 | A kind of side slope hole soil body prestressed anchor note reinforcement means |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108222032A CN108222032A (en) | 2018-06-29 |
| CN108222032B true CN108222032B (en) | 2019-10-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810011323.9A Expired - Fee Related CN108222032B (en) | 2018-01-05 | 2018-01-05 | A kind of side slope hole soil body prestressed anchor note reinforcement means |
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| CN110734264A (en) * | 2019-10-10 | 2020-01-31 | 重庆市园林建筑工程（集团）股份有限公司 | Reinforcing material for historic building, preparation method and grouting reinforcement method |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102605779A (en) * | 2012-04-02 | 2012-07-25 | 胡忠志 | High-anti-pulling anchor rod supporting structure for soft soil foundation pit and construction method of high-anti-pulling anchor rod supporting structure |
| CN202519679U (en) * | 2012-04-02 | 2012-11-07 | 胡忠志 | Micro-expandable rock bolting structure of soft soil foundation pit |
| CN102775115A (en) * | 2012-08-03 | 2012-11-14 | 北京中铁润海科技有限公司 | Anchoring mortar and application method thereof |
| CN103133026A (en) * | 2013-03-26 | 2013-06-05 | 安徽理工大学 | Novel expansion shell inverted wedge type grouting anchor rod |
| CN106638594A (en) * | 2017-01-21 | 2017-05-10 | 三峡大学 | Method for rapidly determining optimal adding content of expanding agent and application of method |
-
2018
- 2018-01-05 CN CN201810011323.9A patent/CN108222032B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102605779A (en) * | 2012-04-02 | 2012-07-25 | 胡忠志 | High-anti-pulling anchor rod supporting structure for soft soil foundation pit and construction method of high-anti-pulling anchor rod supporting structure |
| CN202519679U (en) * | 2012-04-02 | 2012-11-07 | 胡忠志 | Micro-expandable rock bolting structure of soft soil foundation pit |
| CN102775115A (en) * | 2012-08-03 | 2012-11-14 | 北京中铁润海科技有限公司 | Anchoring mortar and application method thereof |
| CN103133026A (en) * | 2013-03-26 | 2013-06-05 | 安徽理工大学 | Novel expansion shell inverted wedge type grouting anchor rod |
| CN106638594A (en) * | 2017-01-21 | 2017-05-10 | 三峡大学 | Method for rapidly determining optimal adding content of expanding agent and application of method |
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| CN108222032A (en) | 2018-06-29 |
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Granted publication date: 20191001 |