CN216948247U

CN216948247U - Steel pipe soil nail with special-shaped spiral anchor

Info

Publication number: CN216948247U
Application number: CN202123350532.2U
Authority: CN
Inventors: 刘小文; 刘耿哲; 周林; 万忠豪
Original assignee: Nanchang University
Current assignee: Nanchang University
Priority date: 2021-12-29
Filing date: 2021-12-29
Publication date: 2022-07-12
Anticipated expiration: 2031-12-29

Abstract

The utility model relates to the technical field of foundation pit supporting, in particular to a steel pipe soil nail with a special-shaped spiral anchor. The utility model can be used in the fields of foundation pit support and the like, and the experimental device solves the defects of poor soil layer adaptability, difficult recovery and the like of the existing soil nails. The soil nail has the advantages of strong soil layer penetrating capability, convenient and flexible construction, no occupation of operation space, less material consumption, low engineering cost and the like, so the soil nail is improved on the basis of the original soil nail, and the application is wider. A proper amount of steel pipe soil nails with special-shaped spiral anchors are driven into a side slope of a foundation pit soil body, cement slurry is injected through the hollow pile body, and the cement slurry permeates into the soil body to enable the soil nails to be tightly combined with the soil body, so that a more stable supporting structure is formed and is widely applied to various construction sites.

Description

Steel pipe soil nail with special-shaped spiral anchor

Technical Field

The utility model relates to the technical field of foundation pit supporting, in particular to a steel pipe soil nail with a special-shaped spiral anchor.

Background

Engineers face many engineering problems in the building construction process, such as collapse of earth along with changes of time and environment during foundation excavation, so that engineering operation cannot be performed orderly, and a large amount of manpower, material resources and material resources are consumed. At present, many foundation pit supporting methods including soil nailing walls have been developed to solve the problem of foundation pit slope collapse. The soil nailing wall is an in-situ soil body reinforcement technology. The slope of the foundation pit is reinforced by soil nails or steel pipes made of steel bars, a steel bar mesh is laid on the surface of the slope, and a layer of concrete surface layer is sprayed on the surface of the slope to combine with the soil slope. Most of materials used by the soil nailing wall are steel, so that the stability of the foundation pit side slope can be enhanced, the soil nailing wall has economy and environmental protection, and is widely used in the aspect of side slope support. However, in actual engineering, soil layers are different in hardness and softness, and it is common to adopt driving-in type steel pipe soil nails for loose soil layers and pore-forming type reinforced soil nails for dense soil layers. When often a soil nail front end is located the hardpan, and the back end is located loose soil layer, if adopt to drive into steel pipe soil nail in the soil nail selection, often appear being located the hardpan in the front end and being difficult to drive into, if adopt pore-forming reinforcing bar soil nail, then pore-forming is difficult again in the loose soil layer of rear end. And the soil nails are difficult to recover.

Based on the reasons, the utility model provides the steel pipe soil nail with the special-shaped spiral anchor.

SUMMERY OF THE UTILITY MODEL

The utility model aims to overcome the defects of the prior art and provides a steel pipe soil nail with a special-shaped spiral anchor.

In order to realize the purpose of the utility model, the utility model adopts the technical scheme that:

the utility model discloses a steel pipe soil nail with a special-shaped spiral anchor, which comprises a spiral anchor and a steel pipe, wherein the spiral anchor is fixed at the inner end of the steel pipe, an annular steel pipe cap is arranged on the outer edge of the outer end of the steel pipe, and a plurality of slurry outlets are arranged on the side wall of the steel pipe.

The inner ring of the steel pipe cap is provided with a cross-shaped cross rod, and four grouting ports are formed between the side wall of the cross rod and the inner ring of the steel pipe cap.

The side wall of the steel pipe is provided with a plurality of slurry outlet groups at equal intervals, and the slurry outlet groups are arranged on the side wall of the steel pipe in an annular array by taking the axis of the steel pipe as an axis through a plurality of slurry outlets.

The outer diameter of the steel pipe cap is larger than that of the steel pipe, and the inner diameter of the steel pipe cap is equal to that of the steel pipe.

The spiral anchor comprises a drill rod and a spiral blade, the drill rod is arranged at the axis of the spiral blade, one end of the drill rod is of a conical structure, the other end of the drill rod is provided with a connecting block, the connecting block is of a square structure, a limiting groove for inserting a connecting rod is formed in the end face of the outer end of the connecting block, the connecting rod is fixed on the end face of the inner end of the steel pipe, and a pin hole for allowing a pin shaft to pass through is formed in the side wall of the connecting rod and the side wall of the connecting block.

The outer diameter of the helical blade is equal to that of the steel pipe.

The outer end of the spiral blade is formed with a transition blade, and the outer diameter of the transition blade is gradually increased from the outer end to the inner end.

The utility model has the beneficial effects that:

(1) the soil nail recovery device can be used in the fields of foundation pit support and the like, and the experimental device overcomes the defects of poor soil layer adaptability, difficulty in recovery and the like of the existing soil nails. The soil nail has the advantages of strong soil layer penetrating capability, convenient and flexible construction, no occupation of operation space, less material consumption, low engineering cost and the like, so the soil nail is improved on the basis of the original soil nail, and the application is wider. A proper amount of steel pipe soil nails with special-shaped spiral anchors are driven into a side slope of a foundation pit soil body, cement slurry is injected through the hollow pile body, and the cement slurry permeates into the soil body to enable the soil nails to be tightly combined with the soil body, so that a more stable supporting structure is formed and is widely applied to various construction sites. Meanwhile, the utility model adopts steel, has strong applicability to soil layers, is convenient to recover and achieves the aim of safe and economic engineering operation;

(2) the utility model combines the operating characteristics of two soil nailing walls, has wider application range and is a first direct driving type, and because the lower part of the utility model is spiral, the utility model can be directly drilled into the soil body by manpower or machines such as a hydraulic drill and the like without pre-drilling, has smaller disturbance to the in-situ soil, has fast construction speed and is very easy to drill into the hard cohesive soil. The second driving-in grouting type has the advantages of direct driving-in of the soil nails and higher pulling resistance, is particularly suitable for soft soil layers such as silt, mucky soil and the like which are difficult to form holes, various filling soils and sandy soils, and has wider application because the upper part of the utility model is the hollow steel pipe, and cement paste is pressed and grouted to form the soil nails after the hollow steel pipe is directly driven into the soil. Therefore, the novel patent has wide application range and is flexibly applied to actual engineering.

Drawings

FIG. 1 is a schematic structural view of the present invention;

fig. 2 is a top view of the present invention.

In the figure: the device comprises a slurry outlet 1, a spiral anchor 2, a steel pipe 3, a steel pipe cap 4, a grouting opening 5, a cross rod 6, a connecting rod 7, a pin shaft 8, a drill rod 21, a spiral blade 22, a connecting block 23 and a transition blade 24.

Detailed Description

The utility model is further illustrated below:

referring to figures 1-2 of the drawings,

the utility model discloses a steel pipe soil nail with a special-shaped spiral anchor, which comprises a spiral anchor 2 and a steel pipe 3, wherein the spiral anchor 2 is fixed at the inner end of the steel pipe 3, an annular steel pipe cap 4 is arranged on the outer edge of the outer end of the steel pipe 3, a plurality of grout outlets 1 are arranged on the side wall of the steel pipe 3, the soil nail is made of steel, the spiral anchor 2 is positioned at the front end of the soil nail, the rear end of the soil nail is made of steel, the steel pipe 3 is of a hollow structure, meanwhile, the grout outlets 1 are arranged on the periphery of the steel pipe 3, the soil nail is easily screwed into a side slope soil body by virtue of the spiral shape, then concrete is injected into the steel pipe 3 at the rear end of the soil nail, and the concrete flows out from the reserved grout outlets 1 to form an anchoring body; the spiral design of the spiral section enables the anchoring force of the soil nails to be more stable, and the soil nails are easy to drill; the steel pipe section can also function without injecting cement paste. The soil nail is simple and convenient to assemble and disassemble, the steel material recovery rate is high if the steel pipe section is not grouted, construction waste can not be generated, the soil nail can be repeatedly used, the soil nail has the functions of protecting the environment and saving materials, and the stratum applicability is stronger and more economical.

The inner ring of the steel pipe cap 4 is provided with a cross-shaped cross rod 6, four grouting ports 5 are formed between the side wall of the cross rod 6 and the inner ring of the steel pipe cap 4, and the drilling tool is used for enabling soil nails to drill into soil by acting on the cross rod 6.

The side wall of the steel pipe 3 is provided with a plurality of grout outlet groups at equal intervals, and the grout outlet groups are arranged on the side wall of the steel pipe 3 in an annular array by taking the axis of the steel pipe 1 as an axis, so that concrete can uniformly flow out from the grout outlets 1 to form an anchoring body.

The outer diameter of the steel pipe cap 4 is larger than the outer diameter of the steel pipe 3, and the inner diameter of the steel pipe cap is equal to the inner diameter of the steel pipe 3, so that the steel pipe 3 cannot be completely drilled into the soil.

The screw anchor 2 comprises a drill rod 21 and a screw blade 22, the drill rod 21 is arranged on the axis of the screw blade 22, one end of the drill rod 21 is of a conical structure, the other end of the drill rod is provided with a connecting block 23, the connecting block 23 is of a square structure, a limiting groove for inserting a connecting rod 7 is formed in the end face of the outer end of the connecting block, the connecting rod 7 is fixed on the end face of the inner end of the steel pipe 3, a pin hole for allowing a pin shaft 8 to pass through is formed in the side wall of the connecting block 23, and the connecting rod 7 on the end face of the inner end of the steel pipe 3 is connected with the limiting groove in the connecting block 23 through the pin shaft 8 so that the screw anchor 2 can be installed and replaced conveniently.

The outer diameter of the helical blade 22 is equal to that of the steel pipe 3, so that after the screw anchor 2 drills into a soil body, the steel pipe 3 can be screwed into the soil body along with the helical blade, and no large gap is formed between the outer walls of the steel pipe 3.

The outer end of the helical blade 22 is formed with a transition blade 24, and the outer diameter of the transition blade 24 is gradually increased from the outer end to the inner end, so that the helical anchor 2 can be better drilled into a slope soil body.

The above description is only an embodiment of the present invention, and is not intended to limit the scope of the present invention, and all equivalent modifications made by the present invention and the contents of the accompanying drawings or directly or indirectly applied to the related technical fields are included in the scope of the present invention.

Claims

1. The utility model provides a take steel pipe soil nail of dysmorphism screw anchor which characterized in that: including screw anchor (2) and steel pipe (3), screw anchor (2) are fixed in the inner of steel pipe (3), be equipped with on the outer edge of the outer end of steel pipe (3) and be annular steel pipe cap (4), be equipped with a plurality of grout outlets (1) on the lateral wall of steel pipe (3).

2. The steel pipe soil nail with the special-shaped spiral anchor according to claim 1, wherein: the inner ring of the steel pipe cap (4) is provided with a cross-shaped cross rod (6), and four grouting ports (5) are formed between the side wall of the cross rod (6) and the inner ring of the steel pipe cap (4).

3. The steel pipe soil nail with the special-shaped spiral anchor according to claim 2, wherein: the side wall of the steel pipe (3) is provided with a plurality of slurry outlet groups at equal intervals, and the slurry outlet groups are arranged on the side wall of the steel pipe (3) in an annular array by taking the axis of the steel pipe (3) as an axis through a plurality of slurry outlets (1).

4. The steel pipe soil nail with the special-shaped spiral anchor according to claim 1, wherein: the outer diameter of the steel pipe cap (4) is larger than the outer diameter of the steel pipe (3), and the inner diameter of the steel pipe cap is equal to the inner diameter of the steel pipe (3).

5. The steel pipe soil nail with the special-shaped spiral anchor according to claim 1, wherein: the spiral anchor (2) comprises a drill rod (21) and spiral blades (22), the drill rod (21) is arranged at the axis of the spiral blades (22), one end of the drill rod (21) is of a conical structure, the other end of the drill rod is provided with a connecting block (23), the connecting block (23) is of a square structure, a limiting groove used for inserting a connecting rod (7) is formed in the end face of the outer end of the connecting block, the connecting rod (7) is fixed on the end face of the inner end of the steel pipe (3), and a pin hole used for allowing a pin shaft (8) to pass through is formed in the side wall of the connecting block (23).

6. The steel pipe soil nail with the special-shaped spiral anchor according to claim 5, wherein: the outer diameter of the spiral blade (22) is equal to that of the steel pipe (3).

7. The steel pipe soil nail with the special-shaped spiral anchor according to claim 6, wherein: the outer end of the spiral blade (22) is provided with a transition blade (24), and the outer diameter of the transition blade (24) is gradually increased from the outer end to the inner end.