CN109653199A - The partition method of cement base Prestressed Rock soil anchor bolt and anchor rod anchored section and free segment - Google Patents
The partition method of cement base Prestressed Rock soil anchor bolt and anchor rod anchored section and free segment Download PDFInfo
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- CN109653199A CN109653199A CN201910051703.XA CN201910051703A CN109653199A CN 109653199 A CN109653199 A CN 109653199A CN 201910051703 A CN201910051703 A CN 201910051703A CN 109653199 A CN109653199 A CN 109653199A
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- free segment
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- reinforcing steel
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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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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2250/00—Production methods
- E02D2250/0046—Production methods using prestressing techniques
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0004—Synthetics
- E02D2300/0006—Plastics
- E02D2300/0014—PU
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2300/00—Materials
- E02D2300/0004—Synthetics
- E02D2300/0018—Cement used as binder
-
- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D2600/00—Miscellaneous
- E02D2600/30—Miscellaneous comprising anchoring details
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- Engineering & Computer Science (AREA)
- Structural Engineering (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (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
本发明提出的水泥基预应力岩土锚杆及锚杆锚固段和自由段的分区方法，属于岩土工程技术领域，该锚杆包括外锚头及锚杆杆体，锚杆杆体分为锚固段及自由段，自由段分为柔性自由段及刚性自由段，柔性自由段紧贴锚固段设置，分区方法是将软质发泡材料注入基坑或边坡锚杆自由段紧贴锚固段的位置，形成一段能够被压缩的区段，即柔性自由段，当锚杆施加预应力时，滑动体被压缩，由于柔性自由段的存在，自由段以及对应的滑动体能够真正达到被锚杆锁紧荷载压缩，能够在滑动体中建立有效的预压应力，滑动面产生压应力，从而提高滑动面的抗剪能力，使得基坑或边坡的稳定和安全能够得以保证。
The cement-based prestressed rock-soil bolt and the method for partitioning the anchoring section and the free section of the bolt provided by the invention belong to the technical field of geotechnical engineering. The free section is divided into a flexible free section and a rigid free section. The flexible free section is set close to the anchor section. The partition method is to inject the soft foam material into the foundation pit or the position of the slope anchor free section close to the anchor section. , to form a section that can be compressed, that is, a flexible free section. When the anchor rod is prestressed, the sliding body is compressed. Due to the existence of the flexible free section, the free section and the corresponding sliding body can truly be locked by the anchor rod. Load compression can establish an effective pre-compression stress in the sliding body, and the sliding surface generates compressive stress, thereby improving the shear resistance of the sliding surface, so that the stability and safety of the foundation pit or slope can be guaranteed.
Description
Technical field
The invention belongs to Geotechnical Engineering fields, are related to foundation pit and slope project, are related specifically to a kind of cement base
The partition method of Prestressed Rock soil anchor bolt and anchor rod anchored section and free segment.
Background technique
According to the basic principle and foundation pit of soil mechanics or the designing technique standard requirements of side slope, in the sliding of foundation pit or side slope
Anchor bar body should be made into free segment in body section, and anchor bar body should be made into anchoring section in the liptinite section of foundation pit or side slope, pass through
The frictional resistance that anchoring section anchor bar body provides prevents the production of sliding surface plus the effect constraint slide mass that is locked of anchor pole outer end
It is raw, to realize the purpose to match with calculation model for design, to ensure the stabilization of foundation pit or slope project, guarantee engineering peace
Entirely.
The mooring rod technique of existing foundation pit and slope project adds steel to twist using pea gravel concreten or mortar or cement paste
The scheme of line or steel tendon or high tensile reinforcement, the subregion of free segment and anchoring section for anchor bar body, practical engineering application process
In, although having divided free segment and anchoring section in design drawing, do not provide the square partition of free segment and anchoring section mostly
Case, but anchor bar body one is poured into bottom, or even give the partition scheme of free segment and anchoring section, do not reach but
The effect of subregion；Or propose technical solution is of poor quality, low efficiency, at high cost, it is difficult to promote and apply in practical projects.
Application No. is 201410030080.5 Chinese patent, a kind of multistage anchoring type resin anchor and its anchoring are disclosed
Method, it includes anchor bar body and aperture preloader, and an anchoring section is equipped at intervals on anchor pole, remaining section is free segment；The point
Anchoring section is that dentation cutting ring is machined on the anchor bar body of this section, and dentation cutting ring housing has a two-component resin anchoring cartridge, double groups
Part resin anchoring cartridge both ends are cased with spacer ring, so that anchor bar body to be successively divided into the first free segment, the since aperture
Some anchoring sections, the second free segment, second point anchoring section, third free segment, thirdly anchoring section, it is desirable that the first free segment is in
The relaxation zone of country rock, thirdly anchoring section is in the elastic region of country rock, remaining section is in the plastic zone of country rock.The technical solution point
The quantity and each section of length of anchoring section and free segment can be adjusted according to pressure from surrounding rock characteristic distributions, dispersed load, avoided
Superpower stress occurs in anchor pole end to concentrate, the body of rod is prevented to be broken or extract anchoring body.The technical solution there are the problem of
Be: complicated for operation, work efficiency is low, quality assurance difficulty is big, at high cost etc., especially quality problems, due to resin mobility and
Permeability is extremely strong, the local sealing to consolidate and being limited in the region of one section of anticipation with the ground on periphery, in rock mass
Has no possibility, resin is inevitable to be overflowed from anchoring section, causes to fail.
Application No. is 201520526632.1 Chinese patents, disclose a kind of water power side slope free section of anchor cable grouting knot
Structure, including side slope surface and the anchor cable being set in side slope surface drilling, the anchor cable drilling is divided into anchoring section and free segment,
Middle free segment is between anchoring section and side slope surface, including being socketed the anchor cable body being set in the anchor cable drilling, the anchor
Grouting Pipe is provided in cable body, the outer rim that anchor cable body is located at the part of free segment is socketed with sealing wrap.The technical solution uses
Geotextiles are that anchor bar body makees housing, it is intended to anchor bar body and rock mass be isolated, to achieve the purpose that reduce side friction, due to drilling
The roughening and cement slurry of side wall can permeate the characteristic of geotextiles, and practical frictional resistance can be bigger, and free segment function is caused to lose
Effect.
Application No. is the Chinese patent of CN201410032446.2, a kind of multistage anchoring type grouting rock bolt and its anchor are disclosed
Solid method, it includes anchor bar body and aperture preloader, and anchor pole is also equipped at intervals with free segment, and the free segment is in the anchor bar body
On be cased with one section of plastic bushing, the both ends contractibility washer of plastic bushing is blocked or is tightened, and is cased with the anchor bar body of plastic bushing
For free segment, the anchor bar body of remaining section is a point anchoring section, thus anchor bar body is successively divided into since aperture the first free segment,
First anchoring section, the second free segment, second point anchoring section, third free segment, thirdly anchoring section, it is desirable that at the first free segment
In the relaxation zone of country rock, thirdly anchoring section is in the elastic region of country rock, remaining section is in the plastic zone of country rock.The technical solution
Attempt that anchor bar body is made to become free segment in its section by plastic bushing, still, due to the frictional resistance between anchor bar body and rock mass
Power or cohesive force still have, and by the transmitting of anchor bar body Compressive Bearing Capacity, the frictional resistance or cohesive force of this section anchor bar body are still
So reinforcing bar, steel tendon or steel strand wires can be passed to by the anchor bar body of adjacent anchoring section, the free segment can not play freedom
The effect of section.
Application No. is 201510434626.8 Chinese patents, disclose a kind of anchor cable subregion anchoring segmentation preload rock stratum control
Method processed, this method implements subregion anchoring using anchor cable, segmentation pre-tightens.Subregion anchoring is directed to fracture area, plastic zone and elasticity
Anchoring section is set separately in area, and anchoring sequence is followed successively by elastic region, plastic zone and fracture area, and elastic region anchoring section uses resin anchoring
Agent anchoring, plastic zone and fracture area are anchored using slip casting；Segmentation pre-tightens after i.e. each anchoring is stablized except the anchoring section of aperture, right
The free segment in anchoring section outer end to aperture carries out tensioning preload.The technical solution can effectively improve the reliability of cable bolting,
Subregion setting anchoring section can effectively avoid whole failure of cable caused by anchor cable is locally broken, and slip casting anchoring has anchoring anchor
Rope and the double action for reinforcing crack country rock；Segmentation, which pre-tightens, has anchor cable overall length compared with high pre-stress, and active support effect is obvious
It improves, CONTROL OF STRATA MOVEMENT effect can be effectively improved.The technical solution is suitable for permanent anchor pole, for facing for base pit engineering
When property anchor pole, this way is complicated for operation, work efficiency is low, long construction period, at high cost.
Realize provisional free section Free Transform effect, free segment must can by Free Compression, and
The frictional resistance or cohesive force of free segment are not transferred to the tensile materials of anchor pole.The prior art is unable to satisfy such requirement, because
This needs the new technical solution of one kind to solve these problems.
Summary of the invention
The technical problems to be solved by the present invention are: provide a kind of cement base Prestressed Rock soil anchor bolt and anchor rod anchored section and
The partition method of free segment, so that foundation pit or the anchor pole of side slope become in slide mass section can be locked load compression by anchor pole
Free segment, anchor pole locks load and in sliding surface effectively generates compression, improves the shear resistance of sliding surface, it is ensured that foundation pit or side
The stabilization of slope engineering guarantees engineering safety.
The specific present invention adopts the following technical scheme that:
The invention proposes a kind of cement base Prestressed Rock soil anchor bolt, which includes outer anchor head and anchor rod body, described
Anchor rod body include be set to the drilling of foundation pit slope surface or presstressed reinforcing steel in side slope surface drilling, anchoring body, rigid free body and
Flexible free body, the presstressed reinforcing steel are continuous whole reinforcing bar, are divided into two parts, respectively anchoring section presstressed reinforcing steel, freedom
Section presstressed reinforcing steel, anchoring section presstressed reinforcing steel is located at the drilling of foundation pit slope surface or side slope surface drilling is inboard, free segment presstressed reinforcing steel point
For rigid free segment presstressed reinforcing steel and flexible free segment presstressed reinforcing steel, be enclosed with outside free segment presstressed reinforcing steel anti-corrosion separation layer and
Oversheath；The anchoring body is arranged outside anchoring section presstressed reinforcing steel, and anchoring body and anchoring section presstressed reinforcing steel constitute anchor rod body
Anchoring section；The rigidity free body is arranged outside rigid free segment presstressed reinforcing steel, and rigid free body and rigid free segment are pre-
The rigid free segment of stress rib composition anchor rod body；The flexibility free body is arranged outside flexible free segment presstressed reinforcing steel, soft
Free love body and flexible free segment presstressed reinforcing steel constitute the flexible free segment of anchor rod body, and flexible free segment is arranged in anchor rod body
Anchoring section and rigid free segment between；
The material of the anchoring body and rigid free body uses cement base cementitious mixes；
The material of the flexibility free body uses the polyurethane foam plastics of foam-in-place.
The invention also provides the partition method of a kind of cement base Prestressed Rock soil anchor bolt anchoring section and free segment, features
It is, the partition method, comprising the following steps:
Step 1: slope surface drills:
Drill in the slope surface of foundation pit or side slope by design requirement, hole depth be equal to anchoring section and free segment length it
With wherein free segment is made of rigid free segment and flexible free segment two parts, and flexible free segment is close to anchoring section setting；
Step 2: placing presstressed reinforcing steel:
Presstressed reinforcing steel is inserted into the hole being drilled into step 1；
Step 3: cement injection base cementitious mixes:
Cement base cementitious mixes are injected into hole, and full of whole holes；
Step 4: flexible foamed material is perfused:
It before or after step 3, inserts the catheter into hole, and the end that conduit is located inside hole is placed in anchor
Gu the intersection of section and flexible free segment；
After completing cement injection base cementitious mixes, flexible foamed material is injected to flexible free segment by conduit, it will be soft
The cement base cementitious mixes in free love section section are squeezed out to hole lateral direction, are located at outermost cement base gelling in hole
Hole is discharged in mixture, and flexible foamed material forms flexible free body in flexible free segment, and flexible free body riddles flexibility certainly
The hole section as corresponding to section；
So far, the subregion of cement base Prestressed Rock soil anchor bolt anchoring section and free segment is completed.
The partition method of the cement base Prestressed Rock soil anchor bolt anchoring section and free segment, further includes: inserted in presstressed reinforcing steel
Before entering hole, anti-corrosion separation layer and oversheath are superscribed outside the presstressed reinforcing steel corresponding to free segment section in advance.
Flexible foamed material described in the partition method of the cement base Prestressed Rock soil anchor bolt anchoring section and free segment is adopted
With the polyurethane foam plastics of foam-in-place.
Through the above design, the present invention can be brought the following benefits: cement base prestressing force proposed by the present invention
The partition method of rock soil anchor and anchor rod anchored section and free segment is flexible foamed material to be injected to foundation pit or side slope anchor pole is free
Section is close to the position of anchoring section, formed one section can compressed section, i.e., flexible free segment, when anchor pole applies prestressing force,
Slide mass is compressed, and due to the presence of flexible free segment, free segment and corresponding slide mass can be really achieved and be locked by anchor pole
Tight load compression, can establish effective compressive pre-stress, sliding surface generates compression, to improve sliding surface in slide mass
Shear resistance, so that the stabilization of foundation pit or side slope and safety can be guaranteed.
Detailed description of the invention
Fig. 1 is cement base Prestressed Rock soil anchor bolt schematic diagram as mentioned in the embodiments of the present invention.
Respectively mark in figure as follows: 1- anchoring section, 2- rigidity free segment, 3- flexibility free segment, 4- anchoring body, 5- rigidity are freely
Body, 6- flexibility free body, 7- conduit.
Specific embodiment
Below with reference to attached drawing of the invention, technical solution in the embodiment of the present invention carries out clear, complete statement, institute
Stating embodiment is only a part of the embodiment of the present invention, instead of all the embodiments.Based on the embodiments of the present invention, ability
Without making creative work, every other embodiment obtained belongs to the present invention to domain those of ordinary skill
Protection scope.
Refering to fig. 1, cement base Prestressed Rock soil anchor bolt in the present embodiment, the anchor pole include outer anchor head and anchor rod body, institute
Stating anchor rod body includes being set to the drilling of foundation pit slope surface or presstressed reinforcing steel, anchoring body 4, rigid free body in side slope surface drilling
5 and flexible free body 6, the presstressed reinforcing steel be continuous whole reinforcing bar, respectively anchoring section presstressed reinforcing steel, free segment prestressing force
Muscle, anchoring section presstressed reinforcing steel is located at the drilling of foundation pit slope surface or side slope surface drilling is inboard, and free segment presstressed reinforcing steel is divided into rigidity certainly
By section presstressed reinforcing steel and flexible free segment presstressed reinforcing steel, anti-corrosion separation layer and oversheath are enclosed with outside free segment presstressed reinforcing steel；
The anchoring body 4 is arranged outside anchoring section presstressed reinforcing steel, the anchoring of anchoring body 4 and anchoring section presstressed reinforcing steel composition anchor rod body
Section 1；The rigidity free body 5 is arranged outside rigid free segment presstressed reinforcing steel, rigid free body 5 and rigid free segment prestressing force
The rigid free segment 2 of muscle composition anchor rod body；The flexibility free body 6 is arranged outside flexible free segment presstressed reinforcing steel, flexible
Free body 6 and flexible free segment presstressed reinforcing steel constitute the flexible free segment 3 of anchor rod body, and flexible free segment 3 is arranged in anchor pole bar
Between the anchoring section 1 of body and rigid free segment 2；
The material of the anchoring body 4 and rigid free body 5 uses cement base cementitious mixes, and cement base cementitious mixes are
Pea gravel concreten, mortar or cement paste；
The material of the flexibility free body 6 uses the polyurethane foam plastics of foam-in-place.
The presstressed reinforcing steel is the high tensile reinforcement that steel strand wires, steel tendon or tensile strength are greater than 400MPa.
The partition method of cement base Prestressed Rock soil anchor bolt anchoring section and free segment proposed by the present invention, including following step
It is rapid:
Step 1: slope surface drills:
It drills in the slope surface of foundation pit or side slope by design requirement, hole depth is equal to the length of anchoring section 1 and free segment
The sum of, wherein free segment is made of rigid free segment 2 and flexible 3 two parts of free segment, and flexible free segment 3 is close to anchoring section 1
Setting；
Step 2: placing presstressed reinforcing steel:
Presstressed reinforcing steel is inserted into the hole being drilled into step 1；
Step 3: cement injection base cementitious mixes:
Cement base cementitious mixes are injected into hole, and full of whole holes, the cement base cementitious mixes are thin
Stone concrete, mortar or cement paste；
Step 4: flexible foamed material is perfused:
Before or after step 3, conduit 7 is inserted into hole, and the end that conduit 7 is located inside hole is placed in
The intersection of anchoring section 1 and flexible free segment 3；
After completing cement injection base cementitious mixes, flexible foamed material is injected to flexible free segment 3 by conduit 7, it will
The cement base cementitious mixes in flexible 3 section of free segment are squeezed out to hole lateral direction, are located at outermost cement base in hole
Hole is discharged in cementitious mixes, and flexible foamed material forms flexible free body 6 in flexible free segment 3, and flexible free body 6 riddles
Hole section corresponding to flexible free segment 3, flexible foamed material uses the polyurethane foam plastics of foam-in-place, flexible foamed
The injection rate of material is determined by test, so that the length of flexible free segment 3 meets design requirement；The conduit 7 is disposable
Or reusable plastic tube or steel pipe, it is placed on when using disposable conduit 7 in hole and does not take out conduit 7, work as use
Withdrawal conduit 7 when the conduit 7 of recycling are cleaned out rear spare；
So far, the subregion of cement base Prestressed Rock soil anchor bolt anchoring section and free segment is completed.
Claims (4)
1. cement base Prestressed Rock soil anchor bolt, which includes outer anchor head and anchor rod body, which is characterized in that the anchor rod body
Including the presstressed reinforcing steel, anchoring body (4), rigid free body (5) and soft being set in the drilling of foundation pit slope surface or side slope surface drilling
Free love body (6), the presstressed reinforcing steel are continuous whole reinforcing bar, are divided into two parts, respectively anchoring section presstressed reinforcing steel, freedom
Section presstressed reinforcing steel, anchoring section presstressed reinforcing steel is located at the drilling of foundation pit slope surface or side slope surface drilling is inboard, free segment presstressed reinforcing steel point
For rigid free segment presstressed reinforcing steel and flexible free segment presstressed reinforcing steel, be enclosed with outside free segment presstressed reinforcing steel anti-corrosion separation layer and
Oversheath；The anchoring body (4) is arranged outside anchoring section presstressed reinforcing steel, and anchoring body (4) and anchoring section presstressed reinforcing steel constitute anchor
The anchoring section (1) of club shaft；The rigidity free body (5) is arranged outside rigid free segment presstressed reinforcing steel, rigid free body (5)
The rigid free segment (2) of anchor rod body is constituted with rigid free segment presstressed reinforcing steel；The flexibility free body (6) be arranged it is flexible from
Outside section presstressed reinforcing steel, the flexible free segment of flexible free body (6) and flexible free segment presstressed reinforcing steel composition anchor rod body
(3), flexible free segment (3) is arranged between the anchoring section (1) of anchor rod body and rigid free segment (2)；
The material of the anchoring body (4) and rigid free body (5) uses cement base cementitious mixes；
The material of the flexibility free body (6) uses the polyurethane foam plastics of foam-in-place.
2. the partition method of cement base Prestressed Rock soil anchor bolt anchoring section and free segment, which is characterized in that the partition method, including
Following steps:
Step 1: slope surface drills:
Drill in the slope surface of foundation pit or side slope by design requirement, hole depth be equal to anchoring section (1) and free segment length it
With wherein free segment be made of rigid free segment (2) and flexible free segment (3) two parts, and flexible free segment (3) is close to anchor
Section (1) setting；
Step 2: placing presstressed reinforcing steel:
Presstressed reinforcing steel is inserted into the hole being drilled into step 1；
Step 3: cement injection base cementitious mixes:
Cement base cementitious mixes are injected into hole, and full of whole holes；
Step 4: flexible foamed material is perfused:
Before or after step 3, conduit (7) are inserted into hole, and the end that conduit (7) is located inside hole is placed in
The intersection of anchoring section (1) and flexible free segment (3)；
After completing cement injection base cementitious mixes, flexible foamed material is injected to flexible free segment (3) by conduit (7), it will
The cement base cementitious mixes in flexible free segment (3) section are squeezed out to hole lateral direction, are located at outermost cement in hole
Hole is discharged in base cementitious mixes, and flexible foamed material forms flexible free body (6), flexible free body in flexible free segment (3)
(6) hole section corresponding to flexible free segment (3) is riddled；
So far, the subregion of cement base Prestressed Rock soil anchor bolt anchoring section and free segment is completed.
3. the partition method of cement base Prestressed Rock soil anchor bolt anchoring section and free segment according to claim 2, feature
It is: further include: before presstressed reinforcing steel is inserted into hole, superscribed outside the presstressed reinforcing steel corresponding to free segment section in advance
Anti-corrosion separation layer and oversheath.
4. the partition method of cement base Prestressed Rock soil anchor bolt anchoring section and free segment according to claim 2, feature
Be: the flexible foamed material uses the polyurethane foam plastics of foam-in-place.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910051703.XA CN109653199A (en) | 2019-01-21 | 2019-01-21 | The partition method of cement base Prestressed Rock soil anchor bolt and anchor rod anchored section and free segment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910051703.XA CN109653199A (en) | 2019-01-21 | 2019-01-21 | The partition method of cement base Prestressed Rock soil anchor bolt and anchor rod anchored section and free segment |
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| CN109184765A (en) * | 2018-08-03 | 2019-01-11 | 中南大学 | A kind of stable state allow pressure release can detachable hydraulic anchor pole and its method for protecting support |
| CN109083165A (en) * | 2018-09-29 | 2018-12-25 | 沈阳建筑大学 | The application method for the autoclase type cement mortar that foams in anchor pole or anchorage cable anchoring section |
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Application publication date: 20190419 |