CN107142933B - The device and method of withdrawal resistance is greatly improved in a kind of anchoring of soil layer - Google Patents
The device and method of withdrawal resistance is greatly improved in a kind of anchoring of soil layer Download PDFInfo
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- CN107142933B CN107142933B CN201710402560.3A CN201710402560A CN107142933B CN 107142933 B CN107142933 B CN 107142933B CN 201710402560 A CN201710402560 A CN 201710402560A CN 107142933 B CN107142933 B CN 107142933B
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- 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
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Abstract
The device of withdrawal resistance is greatly improved in a kind of anchoring of soil layer, bottom including being placed in anchor hole has the anchor pole of rigid disc, rigid disc is placed in anchor hole bottom, anchor hole inner space on rigid disc has poured the first dilatancy cement layer, the second dilatancy cement layer, third dilatancy cement layer ... N dilatancy cement layer respectively from the bottom to top, N >=2, the expansive agent dosage X in dilatancy cement slurry used in the first dilatancy cement layer1Expansive agent dosage X in dilatancy cement slurry used in≤35%, N dilatancy cement layern> 0%, N dilatancy cement layer top have poured cement layer.The device and method of withdrawal resistance is greatly improved in a kind of soil layer anchoring provided by the invention, it can solve the problem of conventional anchor pole anchor pole and anchoring body in Bracing Process slide, greatly improve anti-pulling of anchor bar and supporting effect, and structure is simple, material is easy to get, it is easy to operate, substantially save experimentation cost and period.
Description
Technical field
The present invention relates to soil layers to anchor field, and device and the side of withdrawal resistance are greatly improved in especially a kind of soil layer anchoring
Method.
Background technique
Soil layer anchors technique functions and is derived from 20th century, the 7th international soil mechanics and basic work held in Mexico in 1969
On Cheng Huiyi, subject under discussion once was discussed using soil bolt technology as individual.
After the seventies, in the multiple provincialism international conference held, the experience in relation to mooring rod technique is related to
It is introduced with research.Among the experimental and theoretical study of current mooring rod technique is still evolving.Since the eighties, Sweden, moral
State, the U.S., Britain, Japan and other countries have developed a variety of different types of anchor bolt construction tools and grouting process respectively, and various countries are also
The technical regulation of Soil Anchor Design and construction is respectively formulated.Mooring rod technique is just playing more and more important work in economic construction
With.
Soil bolt has a wide range of applications in fields such as traffic, water conservancy, building, electric power, municipal administration, mining.It is controlled in side slope
In science and engineering journey, suspension roof support is a kind of most commonly seen reinforcing mode, anchor rod anchored technology with its significant technical economic benefit,
It has been widely used.According to incompletely statistics, only domestic and international all kinds of rock-bolts in 2005 are up to more than 600, and usage amount is just
Up to as many as 2.5 hundred million.Improve anti-pulling of anchor bar has high economic benefit in anchor rod anchored engineering.Existing experimental study
Achievement points out that under by confining pressure, ultimate pullout capacity has largely to be increased anchorage body.Therefore, it creates and sharp
With armature boring surrounding rock body lateral pressure, it is of great significance to anti-pulling of anchor bar is improved.
Currently, China is still based on the anchor pole of cement injection in construction method, it is domestic in the anchor pole of cement injection
Anchoring engineering generally uses the ordinary portland cement slurries of 425 labels, and setting time is long, and early strength is low, curing time
It is long, cause the too long problem of construction period, it would be highly desirable to which the new construction technology of one kind changes this status.
Summary of the invention
Technical problem to be solved by the invention is to provide device and sides that withdrawal resistance is greatly improved in a kind of anchoring of soil layer
Method can solve the problem of conventional anchor pole anchor pole and anchoring body in Bracing Process slide, greatly improve anti-pulling of anchor bar
And supporting effect, and structure is simple, and material is easy to get, and it is easy to operate, substantially save experimentation cost and period.
In order to solve the above technical problems, the technical scheme adopted by the invention is that: it is greatly improved in a kind of anchoring of soil layer anti-
The device of pull out force, the bottom including being placed in anchor hole have the anchor pole of rigid disc, and rigid disc is placed in anchor hole bottom, rigidity
Anchor hole inner space on disk has poured respectively from the bottom to top
First dilatancy cement layer, the second dilatancy cement layer, third dilatancy cement layer ... N dilatancy cement layer, N
>=2,
First dilatancy cement layer, the second dilatancy cement layer, third dilatancy cement layer ... N dilatancy cement layer institute
It is successively reduced with the expansive agent dosage Xn in dilatancy cement slurry, n=N
Expansive agent dosage Xn=swelling agent quality/(swelling agent quality+cement quality) × 100%,
Expansive agent dosage X in dilatancy cement slurry used in first dilatancy cement layer1≤ 35%, N dilatancy cement
Expansive agent dosage X in dilatancy cement slurry used in layern> 0%,
N dilatancy cement layer top has poured cement layer, and distance of the cement layer top apart from anchor hole hole is 10-
20cm。
Preferably, between each layer dilatancy cement layer, demarcation plate is provided between N dilatancy cement layer and cement layer.
Preferably, the first dilatancy cement layer, the second dilatancy cement layer, third dilatancy cement layer ... N dilatancy
The height of cement layer is 20-30 centimetres.
Preferably, N=3, it is the first dilatancy cement layer, the second dilatancy cement layer, swollen used in third dilatancy cement layer
Expansive agent dosage Xn in swollen property cement slurry successively successively decreases by 5% amount.
A method of multilayer expansion head is formed using above-mentioned apparatus and greatly improves withdrawal resistance, method includes the following steps:
Step 1: drilling: carrying out drilling on slope supported and form anchor hole；
Step 2: production bottom has the anchor pole of rigid disc；
Step 3: preparing the dilatancy cement slurry of different expansive agent dosage Xn, n=1,2,3 ... N, X1、X2、 X3…XnSuccessively
Reduce, X1≤35%, Xn> 0%；
Step 4: planting bar and pour: bottom being vertically put into anchor hole with the anchor pole of rigid disc, guarantees that anchor pole is in anchor
Hole center position, injecting expansive agent dosage into anchor hole using grouting equipment is X1Dilatancy cement slurry formed the first dilatancy
Cement layer places demarcation plate after the completion of slip casting, then pouring expansive agent dosage on demarcation plate is X2Dilatancy cement slurry formed
Second dilatancy cement layer places demarcation plate after the completion of slip casting, and so on, completion expansive agent dosage is XnN dilatancy
Cement layer pours；
Step 5: starching to form cement layer in the top joints cement of N dilatancy cement layer；
First dilatancy cement layer, the second dilatancy cement layer, third dilatancy cement layer ... N dilatancy cement layer body
Product expansion forms the layering of anchoring body multilayer and expands head, greatly improves the withdrawal resistance of anchor pole.
Another form of the invention are as follows:
The device that withdrawal resistance is greatly improved in a kind of anchoring of soil layer, including the bottom that is placed in anchor hole with rigid disc
Anchor pole, rigid disc are placed in anchor hole bottom, and the anchor hole inner space on rigid disc has poured respectively from the bottom to top
First dilatancy cement layer, the second dilatancy cement layer ... N dilatancy cement layer, N >=2,
In dilatancy cement slurry used in first dilatancy cement layer, the second dilatancy cement layer ... N dilatancy cement layer
Expansive agent dosage Xn successively reduce, n=N
Expansive agent dosage Xn=swelling agent quality/(swelling agent quality+cement quality) × 100%,
Expansive agent dosage X in dilatancy cement slurry used in first dilatancy cement layer1≤ 35%, N dilatancy cement
Expansive agent dosage X in dilatancy cement slurry used in layern> 0%,
Cement layer is poured between every two layers of dilatancy cement layer, N dilatancy cement layer top has poured top cement
Layer, distance of the top cement layer top apart from anchor hole hole are 10-20cm.
Preferably, demarcation plate is provided between each dilatancy cement layer and each cement layer.
Preferably, swollen in dilatancy cement slurry used in N=2, the first dilatancy cement layer and the second dilatancy cement layer
Swollen dose of volume Xn successively successively decreases by 10% amount.
A method of multilayer expansion head is formed using above-mentioned apparatus and greatly improves withdrawal resistance, method includes the following steps:
Step 1: drilling: carrying out drilling on slope supported and form anchor hole；
Step 2: bottom has the anchor pole of rigid disc；
Step 3: preparing the dilatancy cement slurry of different expansive agent dosage Xn, n=1,2 ... N, X1、X2…XnIt is sequentially reduced,
X1≤35%, Xn> 0%；
Step 4: planting bar and pour: bottom being vertically put into anchor hole with the anchor pole of rigid disc, guarantees that anchor pole is in anchor
Hole center position, injecting expansive agent dosage into anchor hole using grouting equipment is X1Dilatancy cement slurry formed the first dilatancy
Cement layer places demarcation plate, then the joints cement layer on demarcation plate after the completion of slip casting, and expansive agent dosage is poured on cement layer is
X2Dilatancy cement slurry form the second dilatancy cement layer, demarcation plate, then joints cement layer are placed after the completion of slip casting, with such
It pushes away, cement layer pours between completion N dilatancy cement layer and two layers of dilatancy cement layer；
Step 5: starching to form top cement layer in the top joints cement of N dilatancy cement layer；
: the first dilatancy cement layer, the second dilatancy cement layer ... N dilatancy cement layer volume expansion form anchoring
Head is expanded in the layering of body multilayer, greatly improves the withdrawal resistance of anchor pole.
The device and method that withdrawal resistance is greatly improved in a kind of soil layer anchoring provided by the invention, has the beneficial effect that:
1, expansive agent dosage in anchor rod anchored section of slurry will be greatly improved for the first time to be applied in soil layer anchorage technology, be broken
Swelling agent is mainly used in static blasting and the engineering of slightly expanded concrete is conventional, establishes the high-strength precompressed anchoring of large dosage swelling agent
Theory and technology system.
2, the expansion cement slurry that different expansive agent dosages are injected in anchor hole expands head effect, shape by dilatancy cement slurry
Be layered at anchoring body multilayer and expand head, in the soil body anti-pulling of anchor bar maximum amplification up to 480%, be greatly reduced anchor pole contact water with
The probability of air, improves the durability of anchor pole, to greatly improve anti-pulling of anchor bar and service life period.
3, the expansion cement slurry of different expansive agent dosages can form multilayer in anchor hole and expand head, with other class anchorage technologies
It compares:
1. saving mechanical anchor head expense；
2. realizing and expanding head in soil automatically, saving, which is purchased, expands head apparatus cost (about 650,000 yuan)；
Expand head process 3. skipping, reduces the anchoring support half duration.
4, rigid disc is set in anchor pole bottom, tension type anchor pole is converted into pressure type anchor rod, to greatly improve anchor
Bar withdrawal resistance and service life period.
5, can substantially save construction cost, shorten the construction period, accelerate construction progress, improve safety stock, have compared with
Wide engineering application prospect.
The present invention can solve the problem of conventional anchor-holding force of anchor bolt deficiency, by expanding head effect automatically using expansion cement slurry,
Changing tension type anchor pole with new process is pressure type anchor rod, and anchor force is reached maximization under minimum cost, can solve routine
The problem of anchor pole anchor pole and anchoring body in Bracing Process slide, greatly improves anti-pulling of anchor bar and supporting effect, and this
Method structure is simple, and material is easy to get, easy to operate, substantially saves experimentation cost and period, be widely used in railway, highway, tunnel,
Hydraulic engineering, coal mining mine tunnel and national defence, base pit engineering, etc. in support engineerings.
Detailed description of the invention
Present invention will be further explained below with reference to the attached drawings and examples:
Fig. 1 is the structural schematic diagram of one device of the embodiment of the present invention；
Fig. 2 is the schematic diagram that the embodiment of the present invention two forms that multilayer expands head；
Fig. 3 is the expansion cement slurry pressure value that three expansive agent dosage of the embodiment of the present invention is 10%；
Fig. 4 is the expansion cement slurry pressure value that three expansive agent dosage of the embodiment of the present invention is 15%；
Fig. 5 is the expansion cement slurry pressure value that three expansive agent dosage of the embodiment of the present invention is 20%；
Fig. 6 is the structural schematic diagram of four device of the embodiment of the present invention；
Fig. 7 is the schematic diagram that the embodiment of the present invention five forms that multilayer expands head.
Specific embodiment
Embodiment one
As shown in Figure 1, the device of withdrawal resistance is greatly improved in a kind of soil layer anchoring, including the bottom belt being placed in anchor hole 5
There is the anchor pole 1 of rigid disc 8 (preferably iron disk), rigid disc 8 is placed in 5 bottom of anchor hole, the anchor hole 5 on rigid disc 8
Inner space has poured respectively from the bottom to top
First dilatancy cement layer 7, the second dilatancy cement layer 6, third dilatancy cement layer 3,
Expansive agent dosage X in dilatancy cement slurry used in first dilatancy cement layer 71=20%；
Expansive agent dosage X in dilatancy cement slurry used in second dilatancy cement layer 62=15%；
Expansive agent dosage X in dilatancy cement slurry used in third dilatancy cement layer 33=10%；
Expansive agent dosage Xn=swelling agent quality/(swelling agent quality+cement quality) × 100%,
3 top of third dilatancy cement layer has poured cement layer 2, and distance of 2 top of cement layer apart from 5 hole of anchor hole is
10-20cm。
Between each layer dilatancy cement layer, it is provided with demarcation plate 4 between third dilatancy cement layer 3 and cement layer 2, separates
Plate 4 is preferably the round plastic thin plate of center opening, and center bore should be equal to 1 diameter of anchor pole, and outer diameter is less than or equal to anchor hole
Hole diameter.Different content expansion cement slurry slurry when its object is to prevent slip casting avoids influencing expansion effect, reduce to drawing
The influence of power.
First dilatancy cement layer 7, the second dilatancy cement layer 6, third dilatancy cement layer 3 height be 20-30 lis
Rice.
Embodiment two
A method of multilayer expansion head is formed using device described in embodiment one and greatly improves withdrawal resistance, this method includes
Following steps:
Step 1: choosing one piece of stable slope supported, by the eliminating impurities on surface and dig out the Soft Soil Layer on surface；
Step 2: drilling: carrying out drilling on slope supported and form anchor hole 5, the height in anchor hole is 1.5 meters, and diameter is 6 lis
Rice；
Step 3: production bottom has the anchor pole 1 of rigid disc 8, and 1 length of anchor pole is 1.8 meters, and outer diameter is 22 millimeters；
Step 4: preparing the dilatancy cement slurry of different expansive agent dosage Xn, n=1,2,3 ... N, X1=20%, X2=
15%, X3=10%；
Preparation method is as follows:
Preparing bulking agent levels is 10%, 15%, 20% dilatancy cement slurry and the cement slurry without swelling agent take
Ordinary portland cement 1800g, 1700g, 1600g, totally three groups.Swelling agent 200g, 300g, 400g are taken again, then weigh up three groups of temperature
Water (50 degrees centigrade), every group of 700g, and group number is successively labeled as to 1,2,3, the weighed cement of institute, swelling agent are poured into and stirred
Mix bucket stirring it is flat after add water and be stirred, be configured to the expansion cement slurry three of the following swelling agent of different bulking agent levels
Group: 10%, 15%, 20%.In addition 2000g ordinary portland cement and 700g warm water is taken to prepare the cement for being free of swelling agent again
Slurry.
Step 5: planting bar and pour: bottom being vertically put into anchor hole 5 with the anchor pole 1 of rigid disc 8, is guaranteed at anchor pole 1
In 5 center position of anchor hole, injecting expansive agent dosage into anchor hole 5 using grouting equipment is X1Dilatancy cement slurry formed first
Dilatancy cement layer 7 places demarcation plate 4 after the completion of slip casting, then pouring expansive agent dosage on demarcation plate 4 is X2Dilatancy water
Mud forms the second dilatancy cement layer 6, places demarcation plate 4 after the completion of slip casting, and so on, completion expansive agent dosage is X3's
Third dilatancy cement layer 3 pours；
Step 6: starching to form cement layer 2 in the top joints cement of third dilatancy cement layer 3；
First dilatancy cement layer 7, the second dilatancy cement layer 6,3 volume expansion of third dilatancy cement layer form anchor
Head is expanded in solid multi-layer layering, as shown in Fig. 2, realizing the withdrawal resistance for greatly improving anchor pole.
Embodiment three
Pressure test and withdrawal resistance pull-out test are carried out to the device that embodiment two is installed,
Foil gauge is pasted on anchor pole 1 before anchor pole 1 is put into anchor hole: (10 lis equidistant according to anchoring depth l
Rice) foil gauge is pasted, foil gauge lead and conducting wire are welded with soldering, coat 704 sealing glue, and wrapped up with insulating tape
Afterwards, foil gauge resistance measurement (generally 120 ohm) finally are carried out, to detect the sticking effect of foil gauge, by foil gauge and company
It connects conducting wire to be fixed on anchor rod body with insulating tape, to be put into together in anchor hole 5 with anchor pole 1.
Pressure acquisition system is utilized after completing to all slurry slip castings, pressure test is carried out to mounted device, i.e.,
Since expansion cement slurry initial set, the situation of change of the bulbs of pressure is tested.It is uninterruptedly measured in 4 hours after the completion of grouting, to
It is primary every test in 12 hours after slurry final set, until its expansive force is constant；Different depth expansive agent dosage in hole
For 10%, 15%, 20% expansion cement slurry pressure value as shown in Fig. 3,4 and 5.
After maintenance 30 days, using technological means such as drawing instrument, static strain Acquisition Instrument, dial gauges, multistage loadings drawing is carried out
Test is pulled out, the parameters such as withdrawal resistance, strain, the displacement during anchor rod drawing are measured；Different depth swelling agent is mixed in anchor hole hole
The maximum withdrawal resistance of expansion cement slurry and the cement slurry without swelling agent that amount is 10%, 15%, 20% is as shown in table 1:
Maximum compressive and stationary value under the different bulking agent levels of table 1
| Bulking agent levels | (single hole anchor pole) maximum withdrawal resistance kN | Maximum swelling compression MPa | Compression MPa is expanded after stabilization |
| 0 | 127 | — | — |
| 10% | 223 | 5.48 | 5.47 |
| 15% | 239 | 8.28 | 8.26 |
| 20% | 168 | 3.82 | 2.68 |
By the data of Fig. 3-5 and table 1 it is found that not adding the anchor pole of swelling agent and the anchor pole maximum of addition different content swelling agent
Drag differs by about one time, and as the increase anti-pulling of anchor bar of bulking agent levels is presented increasing trend, therefore of the present invention one
The device and method that withdrawal resistance is greatly improved in kind soil layer anchoring, not only improves the withdrawal resistance of anchor pole, reduces anchor rod anchored property
The risk that can be failed, also has broader engineering application prospect.
Example IV
As shown in fig. 6, the device of withdrawal resistance is greatly improved in a kind of soil layer anchoring, including the bottom belt being placed in anchor hole 7
Have the anchor pole 1 of rigid disc 6, rigid disc 6 is placed in 7 bottom of anchor hole, 7 inner space of anchor hole on rigid disc 6 by down toward
It is upper to have poured respectively
First dilatancy cement layer 5, the second dilatancy cement layer 3,
Expansive agent dosage X in dilatancy cement slurry used in first dilatancy cement layer 51=20%, second dilatancy water
Expansive agent dosage X in dilatancy cement slurry used in mud layer 32=10%；
Expansive agent dosage Xn=swelling agent quality/(swelling agent quality+cement quality) × 100%,
The cement layer 4 without swelling agent is poured between first dilatancy cement layer 5 and the second dilatancy cement layer 3, the
Two dilatancy cement layers, 3 top has poured top cement layer 2, and distance of cement layer 2 top in top apart from 7 hole of anchor hole is 10-
20cm。
Demarcation plate is provided between each dilatancy cement layer and each cement layer.
Embodiment five
A method of multilayer expansion head is formed using device described in example IV and greatly improves withdrawal resistance, this method includes
Following steps:
Step 1: choosing one piece of stable slope supported, by the eliminating impurities on surface and dig out the Soft Soil Layer on surface；
Step 2: drilling: carrying out drilling on slope supported and form anchor hole 7, the height in anchor hole is 1.5 meters, and diameter is 6 lis
Rice；
Step 3: production bottom has the anchor pole 1 of rigid disc 6, and 1 length of anchor pole is 1.8 meters, and outer diameter is 22 millimeters；
Step 4: preparing the dilatancy cement slurry of different expansive agent dosage Xn, n=1,2,3 ... N, X1=20%, X2=
10%；
Step 5: planting bar and pour: bottom being vertically put into anchor hole 7 with the anchor pole 1 of rigid disc 6, is guaranteed at anchor pole 1
In 7 center position of anchor hole, injecting expansive agent dosage into anchor hole 7 using grouting equipment is X1Dilatancy cement slurry formed first
Dilatancy cement layer 5 places demarcation plate, then the joints cement layer on demarcation plate after the completion of slip casting, expansion is poured on cement layer
Agent volume is X2Dilatancy cement slurry form the second dilatancy cement layer 6, demarcation plate is placed after the completion of slip casting；
Step 6: pouring cement layer 2 at the top of the formation of the cement slurry without swelling agent on the top of the second dilatancy cement layer 6；
First dilatancy cement layer 5,3 volume expansion of the second dilatancy cement layer form the layering of anchoring body multilayer and expand head, such as
Shown in Fig. 7, the withdrawal resistance for greatly improving anchor pole is realized.
Cement used is ordinary portland cement in the various embodiments described above.
The above embodiments are only the preferred technical solution of the present invention, and are not construed as limitation of the invention.This Shen
Please in embodiment and embodiment in feature in the absence of conflict, can mutual any combination.Protection model of the invention
It encloses, the technical solution that should be recorded with claim, the equivalent replacement of technical characteristic in the technical solution recorded including claim
Scheme etc. is protection scope.Equivalent replacement i.e. within this range is improved, also within protection scope of the present invention.
Claims (9)
1. greatly improving the device of withdrawal resistance in a kind of soil layer anchoring, it is characterised in that: including the bottom belt being placed in anchor hole (5)
There is the anchor pole (1) of rigid disc (8), rigid disc (8) is placed in anchor hole (5) bottom, in the anchor hole (5) on rigid disc (8)
Portion space has poured respectively from the bottom to top
First dilatancy cement layer (7), the second dilatancy cement layer (6), third dilatancy cement layer (3) ... N dilatancy water
Mud layer, N >=2,
First dilatancy cement layer (7), the second dilatancy cement layer (6), third dilatancy cement layer (3) ... N dilatancy water
Expansive agent dosage Xn in dilatancy cement slurry used in mud layer is successively reduced, n=N
Expansive agent dosage Xn=swelling agent quality/(swelling agent quality+cement quality) × 100%,
Expansive agent dosage X in dilatancy cement slurry used in first dilatancy cement layer (7)1≤ 35%, N dilatancy cement layer
Expansive agent dosage X in dilatancy cement slurry usedn> 0%,
N dilatancy cement layer top has poured cement layer (2), and distance of cement layer (2) top apart from anchor hole (5) hole is
10-20cm。
2. greatly improving the device of withdrawal resistance in a kind of soil layer anchoring according to claim 1, it is characterised in that: each layer is swollen
Between swollen property cement layer, demarcation plate (4) are provided between N dilatancy cement layer and cement layer (2).
3. greatly improving the device of withdrawal resistance in a kind of soil layer anchoring according to claim 1, it is characterised in that: first is swollen
Swollen property cement layer (7), the second dilatancy cement layer (6), third dilatancy cement layer (3) ... the height of N dilatancy cement layer
It is 20-30 centimetres.
4. greatly improving the device of withdrawal resistance in a kind of soil layer anchoring according to claim 1, it is characterised in that: N=3,
In first dilatancy cement layer (7), the second dilatancy cement layer (6), dilatancy cement slurry used in third dilatancy cement layer (3)
Expansive agent dosage Xn successively successively decrease by 5% amount.
5. a kind of form the side that multilayer expansion head greatly improves withdrawal resistance using device described in any one of the claims 1-3
Method, it is characterised in that method includes the following steps:
Step 1: drilling: carrying out drilling on slope supported and form anchor hole (5)；
Step 2: production bottom has the anchor pole (1) of rigid disc (8)；
Step 3: preparing the dilatancy cement slurry of different expansive agent dosage Xn, n=1,2,3 ... N, X1、X2、X3…XnIt is sequentially reduced,
X1≤35%, Xn> 0%；
Step 4: planting bar and pour: bottom being vertically put into anchor hole (5) with the anchor pole (1) of rigid disc (8), guarantees anchor pole
(1) it is in anchor hole (5) center position, injection expansive agent dosage is X into anchor hole (5) using grouting equipment1Dilatancy cement
Slurry forms the first dilatancy cement layer (7), places demarcation plate (4) after the completion of slip casting, then pour swelling agent on demarcation plate (4) and mix
Amount is X2Dilatancy cement slurry form the second dilatancy cement layer (6), place demarcation plate (4) after the completion of slip casting, and so on,
Completion expansive agent dosage is XnN dilatancy cement layer pour；
Step 5: starching to form cement layer (2) in the top joints cement of N dilatancy cement layer；
First dilatancy cement layer (7), the second dilatancy cement layer (6), third dilatancy cement layer (3) ... N dilatancy water
Mud layer volume expansion forms the layering of anchoring body multilayer and expands head, greatly improves the withdrawal resistance of anchor pole.
6. greatly improving the device of withdrawal resistance in a kind of soil layer anchoring, it is characterised in that: including the bottom belt being placed in anchor hole (7)
There is the anchor pole (1) of rigid disc (6), rigid disc (6) is placed in anchor hole (7) bottom, in the anchor hole (7) on rigid disc (6)
Portion space has poured respectively from the bottom to top
First dilatancy cement layer (5), the second dilatancy cement layer (3) ... N dilatancy cement layer, N >=2,
First dilatancy cement layer (7), second dilatancy cement layer (6) ... dilatancy cement slurry used in N dilatancy cement layer
Interior expansive agent dosage Xn is successively reduced, n=N
Expansive agent dosage Xn=swelling agent quality/(swelling agent quality+cement quality) × 100%,
Expansive agent dosage X in dilatancy cement slurry used in first dilatancy cement layer (7)1≤ 35%, N dilatancy cement layer
(2) expansive agent dosage X in dilatancy cement slurry used inn> 0%,
Cement layer is poured between every two layers of dilatancy cement layer, N dilatancy cement layer top has poured top cement layer, top
Distance of the portion cement layer top apart from anchor hole (5) hole is 10-20cm.
7. greatly improving the device of withdrawal resistance in a kind of soil layer anchoring according to claim 6, it is characterised in that: each expansion
Demarcation plate is provided between property cement layer and each cement layer.
8. greatly improving the device of withdrawal resistance in a kind of soil layer anchoring according to claim 6, it is characterised in that: N=2,
Expansive agent dosage Xn in dilatancy cement slurry used in first dilatancy cement layer (5) and the second dilatancy cement layer (3) is pressed
10% amount is successively successively decreased.
9. a kind of form the side that multilayer expansion head greatly improves withdrawal resistance using device described in any one of the claims 6-8
Method, it is characterised in that method includes the following steps:
Step 1: drilling: carrying out drilling on slope supported and form anchor hole (7)；
Step 2: bottom has the anchor pole (1) of rigid disc (6)；
Step 3: preparing the dilatancy cement slurry of different expansive agent dosage Xn, n=1,2 ... N, X1、X2…XnIt is sequentially reduced, X1≤
35%, Xn> 0%；
Step 4: planting bar and pour: bottom being vertically put into anchor hole (7) with the anchor pole (1) of rigid disc (6), guarantees anchor pole
(1) it is in anchor hole (7) center position, injection expansive agent dosage is X into anchor hole (7) using grouting equipment1Dilatancy cement
Slurry forms the first dilatancy cement layer (5), demarcation plate, then the joints cement layer on demarcation plate is placed after the completion of slip casting, in cement
It is X that expansive agent dosage is poured on layer2Dilatancy cement slurry form the second dilatancy cement layer (6), place after the completion of slip casting point
Partition, then joints cement layer, and so on, complete cement layer between N dilatancy cement layer and two layers of dilatancy cement layer
It pours；
Step 5: starching to form top cement layer in the top joints cement of N dilatancy cement layer；
First dilatancy cement layer (5), the second dilatancy cement layer (3) ... N dilatancy cement layer volume expansion form anchoring
Head is expanded in the layering of body multilayer, greatly improves the withdrawal resistance of anchor pole.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710402560.3A CN107142933B (en) | 2017-06-01 | 2017-06-01 | The device and method of withdrawal resistance is greatly improved in a kind of anchoring of soil layer |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710402560.3A CN107142933B (en) | 2017-06-01 | 2017-06-01 | The device and method of withdrawal resistance is greatly improved in a kind of anchoring of soil layer |
Publications (2)
| Publication Number | Publication Date |
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| CN107142933A CN107142933A (en) | 2017-09-08 |
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| CN108051294B (en) * | 2017-11-06 | 2020-04-24 | 三峡大学 | Device and method for simulating rock mass anchoring under conditions of high ground stress and underground water |
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| CN109024607A (en) * | 2018-07-16 | 2018-12-18 | 三峡大学 | Expand the device and method that head effect reinforces deep rock mass difference rupture zone using swelling agent |
| CN113718767B (en) * | 2021-09-22 | 2023-03-31 | 三峡大学 | Eccentric hook-shaped expansion type pre-stressed anchoring structure and anchoring method thereof |
| CN115506424A (en) * | 2022-10-20 | 2022-12-23 | 中铁大桥勘测设计院集团有限公司 | Deviation rectifying method for existing building |
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| GB1602317A (en) * | 1977-03-31 | 1981-11-11 | Booth W S | Method of making ground anchor or pile |
| FR2636084B1 (en) * | 1988-09-08 | 1992-04-24 | Screg Routes & Travaux | METHOD FOR ANCHORING IN THE GROUND OF A HANGING PILE, IN PARTICULAR FOR AN INFLATABLE STRUCTURE |
| CN104790392B (en) * | 2015-03-01 | 2017-03-01 | 宁波鸿晨建设有限公司 | The constructing device of anti-slub type anti-float anchor rod and construction method |
| CN105780772B (en) * | 2016-03-24 | 2017-08-25 | 三峡大学 | A kind of method by studying characteristic progress anchor pole strengthening motoring optimization design of the dilatancy binding material in anchor pole grouting |
| CN106638594B (en) * | 2017-01-21 | 2019-07-26 | 三峡大学 | A kind of method and its application of the most suitable bulking agent levels addition of quick determination |
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