CN114775592A - Distributed bottom-expanding anchor rod device and construction method thereof - Google Patents
Distributed bottom-expanding anchor rod device and construction method thereof Download PDFInfo
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- CN114775592A CN114775592A CN202111607562.9A CN202111607562A CN114775592A CN 114775592 A CN114775592 A CN 114775592A CN 202111607562 A CN202111607562 A CN 202111607562A CN 114775592 A CN114775592 A CN 114775592A
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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
- E02D15/00—Handling building or like materials for hydraulic engineering or foundations
- E02D15/02—Handling of bulk concrete specially for foundation or hydraulic engineering purposes
- E02D15/04—Placing concrete in mould-pipes, pile tubes, bore-holes or narrow shafts
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D31/00—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution
- E02D31/10—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against soil pressure or hydraulic pressure
- E02D31/12—Protective arrangements for foundations or foundation structures; Ground foundation measures for protecting the soil or the subsoil water, e.g. preventing or counteracting oil pollution against soil pressure or hydraulic pressure against upward hydraulic pressure
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- Structural Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Life Sciences & Earth Sciences (AREA)
- Mining & Mineral Resources (AREA)
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- Civil Engineering (AREA)
- Environmental & Geological Engineering (AREA)
- Hydrology & Water Resources (AREA)
- Piles And Underground Anchors (AREA)
Abstract
The invention relates to a distributed bottom-expanding anchor rod device and a construction method thereof, wherein the anchor rod device comprises a bottom-expanding rod body and a common rod body which are fixedly connected; the bottom expanding rod body comprises a steel pipe and an embedded grouting pipe arranged in the steel pipe, a blade base is arranged at the bottom end of the bottom expanding rod body, a rotary fastener and a bottom expanding blade are mounted on the blade base, and a connecting end plate is arranged at the top end of the bottom expanding rod body; the ordinary body of rod includes steel pipe and embedded slip casting pipe, ordinary body of rod bottom and top are equipped with the connection end plate respectively. The anchor rod has higher uplift bearing capacity, can obviously reduce the number of engineering anchor rods and saves materials. In addition, the self protecting wall of the bottom expanding anchor rod device does not need to use slurry, and is more environment-friendly. The anchor rod can be widely applied to soft clay or loose sand layers and the like, and the collapsed stratum can be generated, so that the application range of the anchor rod is greatly expanded.
Description
Technical Field
The invention relates to the field of anti-floating of underground buildings, in particular to a distributed bottom-expanding anchor rod device and a construction method thereof.
Background
The anti-floating anchor rod is one of the anti-floating measures for underground structure in building engineering. The anti-floating construction method is widely applied to solving the anti-floating problem of underground construction due to simple construction and low manufacturing cost. The full section of the common anchor rod is one diameter, and the anchor rod can provide larger anti-pulling force in rock strata or hard plastic strata. However, in soft plastic or plastic soil layers, the pullout resistance provided by common anchor rods is limited, and the length of the anchor rod is often increased to obtain the required pullout resistance bearing capacity. In addition, the ordinary anchor rod needs to be formed into a hole firstly, and when a collapsed stratum is likely to appear, construction measures of mud wall protection or casing follow-up are often needed, so that great environmental pollution is easily caused, or the working procedure is complex, and the manufacturing cost is high.
Disclosure of Invention
The invention aims to solve the technical problem of providing a distributed bottom-expanding anchor rod device and a construction method thereof, wherein the anchor rod has higher uplift bearing capacity, the number of engineering anchor rods can be obviously reduced, and materials are saved.
The technical scheme adopted by the invention for solving the technical problems is as follows: constructing a distributed bottom expanding anchor rod device, which comprises a bottom expanding rod body and a common rod body which are fixedly connected; the bottom expanding rod body comprises a steel pipe and an embedded grouting pipe arranged in the steel pipe, a blade base is arranged at the bottom end of the bottom expanding rod body, a rotary fastener and a bottom expanding blade are mounted on the blade base, and a connecting end plate is arranged at the top end of the bottom expanding rod body; the ordinary body of rod includes steel pipe and embedded slip casting pipe, ordinary body of rod bottom and top are equipped with the connection end plate respectively.
According to the scheme, the end part of the first section of the bottom expanding rod body is provided with the sealing guide cap.
According to the scheme, the connecting end plate is provided with the bolt hole.
According to the scheme, the embedded grouting pipe injects cement paste.
According to the scheme, the steel pipe is provided with the slurry permeating hole.
The invention also provides a distributed type bottom expanding anchor rod device and a construction method thereof, wherein the distributed type bottom expanding anchor rod device comprises the following steps:
the method comprises the following steps: calculating the range of the required expanded-base section according to the site stratum condition and the pulling-resistant bearing capacity requirement of a single anchor rod, and selecting and determining the lengths of an expanded-base rod body and a common rod body;
step two: prefabricating a rod body structure of a bottom expanding rod body in a factory, and configuring a bottom expanding blade and a blade base;
step three: adopting a construction mode of pre-hole forming or static pressure, installing a sealing guide cap at the bottom end of the first section of the bottom expanding rod body, and putting the anchor rod body or the static pressure first section of the anchor rod body into the drill hole to enter the stratum;
step four: splicing a second section of the bottom expanding rod body through the connecting end plate, and continuously placing the second section of the bottom expanding rod body into a drill hole or enabling the static pressure rod body to enter the stratum;
step five: repeating the third step and the fourth step until all the bottom-expanding rod bodies and the common rod bodies are pressed into the stratum;
step six: injecting cement slurry into the embedded grouting pipe, wherein the cement slurry is injected into the first section of the bottom expanding rod body to form high pressure, and the high pressure drives the rotary fastener on the blade base to slowly expand the bottom expanding blade to be embedded into a peripheral soil layer to form a bottom expanding section; after the blades of the first section of bottom expanding rod body are completely expanded, high-pressure cement slurry is injected into the second section of rod body and the third section of rod body in sequence, and under the action of the high-pressure cement slurry, the bottom expanding blades of all bottom expanding sections are slowly expanded to a final normal working state respectively to form a multi-section distributed bottom expanding structure;
step seven: after all the expanded base rod bodies are completely grouted, the cement paste continuously flows upwards into the common rod bodies; after the hollow structures of all the rod bodies are filled with cement paste, the grouting is stabilized for a period of time, and the grouting effect is guaranteed.
The distributed bottom-expanding anchor rod device and the construction method thereof have the following beneficial effects:
1. the invention can expand the bottom at different depths in the soil layer according to the ground conditions and the pulling-resistant bearing capacity requirement of a single anchor rod, increase the sectional area of the anchor rod, change the transmission mode of the frictional resistance of the soil body, obviously improve the pulling-resistant bearing capacity, reduce the number of the engineering anchor rods and save materials.
2. The distributed bottom expanding anchor rod device can be constructed in a static pressure or hammering mode, and the self protecting wall of the bottom expanding anchor rod device does not need to use slurry, so that the distributed bottom expanding anchor rod device is more environment-friendly. The anchor rod can be widely applied to soft clay or loose sand layers and the like, collapsed strata are prone to occurring, and the application range of the anchor rod is greatly expanded.
Drawings
The invention will be further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a schematic view of a pedestal body;
FIG. 2 is a schematic view of a conventional stick body;
FIG. 3 is a schematic view of a distributed bellout anchor apparatus for use in harder formations;
fig. 4 is a schematic view illustrating an operating state of the distributed type under-reamed anchor rod device in fig. 3;
FIG. 5 is a schematic view of the enlarged-base mast body of FIG. 3;
FIG. 6 is a sectional view A-A of FIG. 5;
FIG. 7 is a schematic view of the under-reamed blades of FIG. 6 in a retracted state;
FIG. 8 is a schematic view of a distributed under-reamed anchor device for softer strata;
fig. 9 is a schematic view of the distributed type under-reamed anchor rod device in fig. 8 in an operating state;
FIG. 10 is a schematic view of the enlarged base stem of FIG. 8;
FIG. 11 is a sectional view taken along line B-B of FIG. 10;
fig. 12 is a schematic view of the bellowing blade of fig. 11 in a contracted state.
Detailed Description
For a more clear understanding of the technical features, objects and effects of the present invention, embodiments of the present invention will now be described in detail with reference to the accompanying drawings.
As shown in fig. 1 to 12, the distributed type enlarged base anchor apparatus of the present invention is divided into an enlarged base rod body 1 and a general rod body 2, and the enlarged base rod body 1 and the general rod body 2 are spliced together.
The club-footed body 1 comprises a steel pipe 3 and an embedded grouting pipe 4. The bottom end of the bottom expanding rod body is provided with a blade base 5, and a rotary fastener 6 and a bottom expanding blade 7 are installed on the blade base 5. The bottom expanding blade 7 is of a fan blade type or an umbrella blade type. The top end of the bottom expanding rod body is provided with a connecting end plate 8, and a plurality of bolt holes 9 are formed in the connecting end plate 8. The end part of the first section of the bottom expanding rod body 1 is provided with a sealing guide cap 10.
The ordinary body of rod 2 includes steel pipe 3 and embedded slip casting pipe 4, and the ordinary body of rod 2 bottom and top are equipped with respectively and connect end plate 8.
The bottom expanding rod body 1 and the common rod body 2 adopt a hollow structure, and after the hollow rod body is filled with cement paste, the strength and the rigidity of the anchor rod body can be improved. After the anchor rod device is constructed to the designed elevation, high-pressure cement slurry is injected into the anchor rod device with the hollow structure, and the high-pressure cement slurry drives the bottom expanding blades 7 on the blade base 5 to slowly expand to the final working form so as to form a bottom expanding section.
And selecting different forms and construction methods of the bottom expanding blades 7 according to different stratum conditions. When the stratum is hard, the fan blade type bottom expanding blade 7 and the construction method of pre-hole forming can be selected. When the stratum is softer, the bottom-expanding blade 7 with the shape of the umbrella blade can be selected and a static pressure construction method is preferentially adopted.
Preferably, the club-footed body 1 can be arranged in a single section or in multiple sections according to the buried depth of the stratum and the soft and hard state. When the multiple sections are arranged, the bottom expanding sections can be distributed at equal intervals or at non-equal intervals.
Preferably, if high-pressure cement slurry is adopted to force the expanding blades 7 to be blocked in the expanding process, a power device can be arranged at the top of the anchor rod device, so that the anchor rod rotates to drive the expanding blades 7 to rotate, a soil layer is physically cut, and the resistance of the expanding blades 7 in the expanding process is reduced.
Preferably, the outer wall of the steel pipe 3 of the anchor rod device can be properly provided with a plurality of small slurry penetrating holes, and cement slurry can permeate into the surrounding stratum of the steel pipe 3 through the small holes in the grouting and pressure stabilizing stage, so that the frictional resistance between the anchor rod and the soil body is increased, and the pulling resistance bearing capacity of a common rod section is improved.
The bottom expanding blade 7 on the bottom expanding rod body 1 is tightly attached to the blade base 5 or the pipe wall of the steel pipe 3 in the construction process. After construction is finished, the concrete can be completely expanded and embedded into a soil layer under the action of middle cement paste pressure. The contact area of the anchor rods and the soil layer is increased, the transmission mode of the frictional resistance of the soil body is changed, the uplift bearing capacity is obviously improved, the number of the engineering anchor rods is reduced, and materials are saved.
The bottom-expanding anchor rod device can be constructed in a static pressure or hammering mode, and the self wall protection of the bottom-expanding anchor rod device does not need to use mud, so that the bottom-expanding anchor rod device is more environment-friendly. The anchor rod can be widely applied to soft clay or loose sand layers and the like, collapsed strata are prone to occurring, and the application range of the anchor rod is greatly expanded.
The expanding anchor rod device is divided into an expanding base rod body 1 and a common rod body 2. The pedestal rod body 1 and the common rod body 2 can be manufactured in a factory and are simply assembled after being transported to a construction site. The construction speed is fast, saves building materials, and is more green.
The invention further provides a distributed bottom expanding anchor rod device and a construction method thereof, wherein the distributed bottom expanding anchor rod device comprises the following construction steps:
the method comprises the following steps: and calculating the range of the required bottom expanding section according to the site stratum condition and the pulling-resistant bearing capacity requirement of a single anchor rod, and selecting and determining the optimal combination of the bottom expanding rod body and the common rod body.
Step two: a rod body structure of a bottom expanding rod body is prefabricated in a factory, and a proper bottom expanding blade and a blade base are configured.
Step three: and selecting a construction mode of pre-pore forming or static pressure according to the site stratum condition. And installing a sealing guide cap at the bottom end of the first section of the expanded-base rod body, and putting the anchor rod body or static pressure first section of the anchor rod body into the drilled hole to enter the stratum.
Step four: and splicing the second section of the expanded-base rod body through the connecting end plate, and continuously putting the second section of the expanded-base rod body into the drill hole or putting the static-pressure rod body into the stratum.
Step five: and repeating the third step and the fourth step until all the expanded base rod bodies and the common rod bodies are pressed into the stratum.
Step six: grout is injected into the slip casting pipe of formula of inlaying, forms the high pressure after the grout fills the first section and expands the body of the bottom rod, and the high pressure drives the rotatory fastener on the blade base for expand the bottom blade and slowly open, imbed to peripheral soil layer in, form and expand the bottom section. After the blades of the first section of the bottom expanding rod body are expanded, high-pressure cement slurry is injected into the second section of the rod body and the third section of the rod body in sequence, and under the action of the high-pressure slurry, the bottom expanding blades of all the bottom expanding sections are slowly expanded to a final normal working state respectively to form a multi-section distributed bottom expanding structure.
Step seven: after all the bottom expanding rod bodies are grouted, the cement paste continuously flows upwards into the common rod bodies. After the hollow structures of all the rod bodies are filled with cement paste, the grouting is stabilized for a period of time, and the grouting effect is ensured.
While the present invention has been described with reference to the embodiments shown in the drawings, the present invention is not limited to the embodiments, which are illustrative and not restrictive, and it will be apparent to those skilled in the art that various changes and modifications can be made therein without departing from the spirit and scope of the invention as defined in the appended claims.
Claims (6)
1. A distributed bottom-expanding anchor rod device is characterized by comprising a bottom-expanding rod body (1) and a common rod body (2) which are fixedly connected; the bottom expanding rod body (1) comprises a steel pipe (3) and an embedded grouting pipe (4) arranged inside the steel pipe (3), a blade base (5) is arranged at the bottom end of the bottom expanding rod body (1), a rotary fastener (6) and a bottom expanding blade (7) are mounted on the blade base (5), and a connecting end plate (8) is arranged at the top end of the bottom expanding rod body (1); the common rod body (2) comprises a steel pipe (3) and an embedded grouting pipe (4), and the bottom end and the top end of the common rod body (2) are respectively provided with a connecting end plate (8).
2. A distributed type bottom-expanding anchor rod device according to claim 1, characterized in that the end of the first section of the bottom-expanding rod body (1) is provided with a sealing guide cap (10).
3. A distributed bellout anchor rod apparatus as claimed in claim 1, in which the connecting end plate (8) is provided with bolt holes (9).
4. A distributed bottom-expanding anchor device according to claim 1, wherein the in-line grout pipe (4) is injected with grout.
5. A distributed type bottom-expanding anchor rod device according to claim 1, wherein the steel pipe (3) is provided with a slurry-permeable hole.
6. A construction method of the distributed type under-reamed anchor rod device according to claim 1, comprising the steps of:
the method comprises the following steps: calculating the range of the required expanded-base section according to the site stratum condition and the pulling-resistant bearing capacity requirement of a single anchor rod, and selecting and determining the lengths of an expanded-base rod body and a common rod body;
step two: prefabricating a rod body structure of a bottom expanding rod body in a factory, and configuring a bottom expanding blade and a blade base;
step three: adopting a construction mode of pre-pore forming or static pressure, installing a sealing guide cap at the bottom end of the first section of the expanded-base rod body, and placing an anchor rod body or a static pressure first section of the anchor rod body into the ground in the drill hole;
step four: splicing a second section of the bottom expanding rod body through the connecting end plate, and continuously placing the second section of the bottom expanding rod body into a drill hole or enabling the static pressure rod body to enter the stratum;
step five: repeating the third step and the fourth step until all the bottom-expanding rod bodies and the common rod bodies are pressed into the stratum;
step six: injecting cement slurry into the embedded grouting pipe, wherein the cement slurry is injected into the first section of the bottom expanding rod body to form high pressure, and the high pressure drives the rotary fastener on the blade base to slowly expand the bottom expanding blade to be embedded into the peripheral soil layer to form a bottom expanding section; after the blades of the first section of bottom expanding rod body are completely expanded, high-pressure cement slurry is injected into the second section of rod body and the third section of rod body in sequence, and under the action of the high-pressure cement slurry, the bottom expanding blades of all bottom expanding sections are slowly expanded to a final normal working state respectively to form a multi-section distributed bottom expanding structure;
step seven: after all the bottom expanding rod bodies are completely grouted, the cement paste continuously flows upwards into the common rod bodies; after the hollow structures of all the rod bodies are filled with cement paste, the grouting is stabilized for a period of time, and the grouting effect is ensured.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111607562.9A CN114775592A (en) | 2021-12-27 | 2021-12-27 | Distributed bottom-expanding anchor rod device and construction method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111607562.9A CN114775592A (en) | 2021-12-27 | 2021-12-27 | Distributed bottom-expanding anchor rod device and construction method thereof |
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| CN114775592A true CN114775592A (en) | 2022-07-22 |
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| CN202111607562.9A Pending CN114775592A (en) | 2021-12-27 | 2021-12-27 | Distributed bottom-expanding anchor rod device and construction method thereof |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116201112A (en) * | 2023-05-06 | 2023-06-02 | 四川蜀道建筑科技有限公司 | Anti-floating anchor rod structure for preventing water from being reversed |
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2021
- 2021-12-27 CN CN202111607562.9A patent/CN114775592A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116201112A (en) * | 2023-05-06 | 2023-06-02 | 四川蜀道建筑科技有限公司 | Anti-floating anchor rod structure for preventing water from being reversed |
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