CN215052905U - Major diameter steel pipe friction pile anticorrosion coating - Google Patents

Abstract

The utility model belongs to the technical field of steel pipe slide-resistant pile protection, in particular to an anticorrosive protective layer of a large-diameter steel pipe slide-resistant pile; overcome a great deal of problem that current anticorrosive coating protection and electrochemistry protection exist, this scheme is equipped with the steel pipe including pouring the concrete core pile on the landslide body and sliding bed on the concrete core pile, from interior to exterior is equipped with fiber concrete protective layer, polymer bellows and slip casting body on the steel pipe in proper order. The concrete construction comprises the following steps: mechanically forming or digging a hole, and checking the depth of the hole; hoisting the steel pipe, positioning and temporarily fixing; installing a polymer corrugated pipe; installing and unfolding a positioning bracket; pouring a concrete core pile; pouring a fiber concrete protective layer; and pouring the grouting body. The utility model provides a technique of major diameter steel pipe friction pile anticorrosion protective layer can adopt in the place that has stronger corrosivity, also can use in the higher area of groundwater level, can overcome the poor problem of steel pipe friction pile corrosion resistance, improves its durability and labour performance.

Description

Major diameter steel pipe friction pile anticorrosion coating

Technical Field

The utility model belongs to the technical field of steel pipe friction pile protection, concretely relates to major diameter steel pipe friction pile anticorrosion coating.

Background

The land features of China are various, the difference of the relief of the land is large, with the development of the economic society, the infrastructure is also promoted rapidly, and the construction of various engineering facilities in mountainous areas and hilly areas is increased gradually, such as newly-built roads and railways of various grades, large-scale reservoirs, mineral resource exploitation and the like. With the increase of engineering construction and human activities, various types of landslides also occur, particularly in mountainous regions with rich rainfall, landslide disasters are more frequent, property loss and casualties caused by landslide accidents are also very serious, and meanwhile, landslides can influence the operation of roads and railways, so that engineering reinforcement treatment needs to be carried out on the mountains in an unstable state, and certain anti-skidding measures need to be taken. The anti-slide pile is a horizontal load-bearing pile, penetrates through a sliding surface and goes deep into a sliding bed to support and block the downward sliding of a sliding body and play a role in stabilizing a slope body, is suitable for the landslide of shallow layers and medium and thick layers, is used for balancing the downward sliding thrust of the landslide body by inserting the anti-slide pile into a stable stratum below the sliding surface and utilizing the embedding effect of a stable rock-soil body below a sliding surface to increase the stability of the landslide body, and when the landslide body slides downward, the anti-slide pile is subjected to the impedance of the anti-slide pile to enable the sliding body in front of the pile to reach a stable state.

The large-diameter steel pipe anti-slide pile serves as a novel supporting and retaining structure and is widely applied to emergency rescue and treatment reinforcement of landslides in recent years. Compared with a reinforced concrete slide-resistant pile, the steel pipe has the advantages of high rigidity and bearing capacity, good site adaptability, flexible pile position arrangement, easy guarantee of construction quality, more long and standard pile diameter, flexible design, small disturbance on rock-soil mass, convenient transportation, high construction speed, environmental protection, good economic effect and the like. At present, the diameter of a steel pipe pile commonly used in landslide rescue and treatment is about 200-1000 mm, and the wall thickness is 6-15 mm. The supporting structure is inserted into the steel pipe pile after being formed into a hole through the down-the-hole drill, then concrete is poured into the steel pipe pile, fiber concrete or cement mortar is poured between the steel pipe and the soil body, cement slurry permeates and diffuses into the soil body around the steel pipe pile, the overall strength of the surrounding rock-soil body can be improved, and the supporting and anti-sliding capacity is formed. The steel pipe anti-slide pile is mainly used for supporting landslide, and because the anti-slide pile is mostly arranged underground, the steel pipe pile is easy to corrode under the conditions of soil and underground water, and the corrosion problem of the common steel pipe anti-slide pile is more prominent, it is important to take effective measures to protect the steel pipe pile from being corroded by the soil and the underground water.

At present, the main methods for protecting the underground steel structure comprise: and a concrete protective layer, an anticorrosive coating protection layer and an electrochemical protection layer are arranged. The research and application of the protective layer in the reinforced concrete structure are more, and the arrangement of the protective layer in the steel structure and the combined structure is still needed to be researched.

The protection of the anti-corrosion coating is a commonly adopted method at home and abroad, but the anti-corrosion coating has poor durability and short aging period, and is not very suitable for underground structures such as slide-resistant piles; meanwhile, the heavy anti-corrosion coating has higher requirements on surface treatment and construction quality, and the construction quality is difficult to ensure by on-site repair, so that the expected effect of the underground environment cannot be achieved. The electrochemical protection needs a reliable external power supply or a sacrificial anode material, has higher requirement on daily maintenance and management, and is not suitable for being used in a high-resistance environment and a place with stray current.

SUMMERY OF THE UTILITY MODEL

In order to overcome the problem that current anticorrosive coating protection exists the durability and the construction degree of difficulty is big, the utility model provides a major diameter steel pipe friction pile anticorrosion coating's technique can adopt in the place that has stronger corrosivity, also can use in the higher area of groundwater level, can overcome the poor problem of steel pipe friction pile corrosion resistance, improves its durability and labour performance.

In order to achieve the above object, the present invention adopts the following technical solutions:

the utility model provides a major diameter steel pipe friction pile anticorrosion protective layer, is equipped with steel pipe 2, its characterized in that including pouring concrete core pile 1 on the landslide body 7 and slide bed 8 on concrete core pile 1: and the steel pipe 2 is sequentially provided with a fiber concrete protective layer 3, a polymer corrugated pipe 4 and a grouting body 5 from inside to outside.

The fiber concrete protective layer 3 is formed by pouring fine stone fiber concrete, and steel fibers are added into the fine stone fiber concrete.

The diameter of the polymer corrugated pipe 4 is 4-10cm larger than that of the steel pipe 2, and the diameter difference between the polymer corrugated pipe 4 and the steel pipe 2 is the thickness of the fiber concrete protective layer 3.

The cement slurry used by the grouting body 5 comprises cement, fine aggregate, a water reducing agent, an expanding agent and water.

And a plurality of positioning brackets 6 which are uniformly arranged are arranged in the fiber concrete protective layer 3.

The utility model has the advantages that:

1. the utility model provides a steel pipe friction pile anticorrosion protective layer technical scheme has overcome a great deal of defect of anticorrosive coating protection method and electrochemistry protection method, and this scheme is fit for setting up the steel-pipe pile in soil more, and its construction is simple, the dependable performance.

2. The arrangement of the high-molecular corrugated pipe can ensure the thickness of fiber concrete, and eliminates the problems that the thickness of a protective layer cannot meet the requirement, a local protective layer is lost and other quality problems caused by hole collapse or soil block falling in the process of pouring the protective layer. And the polymer corrugated pipe can isolate underground water, avoid the corrosive water and the corrosion action of protective layer concrete in soil, prolong the service time of the steel pipe slide-resistant pile and improve the service performance of the steel pipe slide-resistant pile.

3. The positioning bracket is hoisted after the installation and positioning of the steel pipe and the corrugated pipe are finished, and the positioning pin is pulled out after the inspection is qualified, so that the difficult problems of installation and positioning of the large-diameter corrugated pipe can be solved.

4. The grouting body outside the corrugated pipe can permeate and diffuse to the soil body around the pile under the action of pressure to cement the rock-soil body, so that the overall strength of the surrounding rock-soil body is improved, the supporting and retaining capability of the pile body is improved, and the corrosion of media such as underground water to the steel pipe pile can be further reduced.

Drawings

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

FIG. 2 is a top view of the anti-corrosion protective layer of the large-diameter steel pipe slide-resistant pile of the present invention;

FIG. 3 is a sectional view of the anti-corrosion protective layer of the large-diameter steel pipe slide-resistant pile of the present invention;

FIG. 4 is a schematic view of the positioning bracket of the present invention;

shown in the figure: concrete core pile 1, steel pipe 2, fiber concrete protective layer 3, polymer bellows 4, slip casting 5, locating support 6, landslide body 7, smooth bed 8.

Detailed Description

The technical solution of the present invention is further described by the following specific embodiments with reference to the accompanying drawings:

example 1

The utility model provides a major diameter steel pipe friction pile anticorrosion protective layer, including concrete core pile 1, steel pipe 2, fibre concrete protective layer 3, polymer bellows 4 and slip casting body 5 have set gradually outside concrete core pile 1.

The strength grade of the material of the concrete core pile 1 and the wall thickness and the diameter of the steel pipe 2 are determined according to the specific situation of treatment engineering, and the designed bearing capacity requirement needs to be met.

The fiber concrete protective layer 3 is formed by pouring fine stone fiber concrete, wherein steel fibers are added to reduce crack generation and improve the working performance of the protective layer.

The diameter of the polymer corrugated pipe 4 is larger than the diameter of the steel pipe pile by 4-10cm, the diameter difference of the polymer corrugated pipe and the steel pipe pile is the thickness of the fiber concrete protective layer, and the specific diameter is determined by the safety level of engineering, the corrosivity of a site and the diameter of the steel pipe pile.

The cement slurry used for the grouting body 5 comprises cement, fine aggregate, a water reducing agent, an expanding agent and water.

A plurality of positioning brackets 6 which are uniformly arranged are arranged in the fiber concrete protective layer 3. The positioning support 6 compresses the steel ring and is fixed by the bolt before installation, the diameter of the positioning support is reduced, smooth installation of the corrugated pipe is guaranteed, and after the polymer corrugated pipe 4 is installed in place smoothly, the position of the polymer corrugated pipe 4 can be fixed after the bolt steel ring is removed and bounced off. Each group of positioning supports 6 are four compressed steel rings which are uniformly distributed on the circumference, and the vertical distance of the compressed steel rings of the positioning supports is 200 cm. The compression steel ring is made of a thin spring steel band with good elasticity.

The construction steps of the anti-corrosion protective layer of the large-diameter steel pipe slide pile are as follows:

1. holes are mechanically formed or dug and the hole depth is checked. The selection of the drilling mode and the equipment is comprehensively considered by combining the factors such as construction efficiency, construction conditions, geological environment and the like. The drilling positioning is that after the site is leveled, on the basis of a construction drawing, the position of the drilling hole is positioned in advance by adopting a corresponding measuring instrument, and a steel pipe is laid on a bent frame for positioning. In the process of drilling, the quality of the formed hole is ensured, the quality of the formed hole of the drilled hole, including the aperture, the hole depth and the drill hole gradient, is controlled, and meanwhile, when the stability of the hole wall is poor, the hole collapse phenomenon possibly occurs, and corresponding measures are prepared.

2. And hoisting the steel pipe 2, and positioning and temporarily fixing. And (3) checking and accepting the steel pipes according to design requirements, hoisting the steel pipes 2 by using a crane, hoisting the steel pipes into the pile holes in place, preventing the steel pipes from deforming during hoisting, and paying attention to the fact that the steel pipes cannot collide the hole walls. If the steel pipe is too long, the steel pipe can be hoisted in sections, vertical welding is carried out on the hole opening, and the quality of a welding seam is checked; and after the steel pipe is hoisted in place, measuring the steel pipe, and temporarily fixing the steel pipe after the verticality of the steel pipe is qualified.

3. Install polymer bellows 4, strict inspection bellows quality before the hoist and mount guarantees not damaged nothing and warp, and the bellows sets up the height and can confirms according to the design.

4. Installing and expanding a positioning support 6, compressing a steel ring and fixing the steel ring by using a bolt before installing the positioning support 6, and removing the bolt after the steel ring is bounced open to fix the position of the corrugated pipe after the corrugated pipe is smoothly installed in place.

5. And (5) pouring the concrete core pile 1. The pile body concrete is preferably premixed concrete with the strength grade required by design, before pouring, the slump of the pile body concrete is detected, and at least one group of test blocks is reserved in each pile according to the specification. Pouring into the well by using the chute stringing barrel, and directly moving a concrete pump discharge port into the hole for feeding if the fall of concrete is not more than 2 m. When the depth of the pile hole exceeds 12m, concrete guide pipes are adopted for continuous layered pouring, and the pile is vibrated and compacted.

6. Pouring a fiber concrete protective layer 3, wherein the particle size of a coarse aggregate in the fiber concrete protective layer 3 is preferably 5-20 mm; the mud content of the broken stone is preferably less than or equal to 1.0 percent, the mud block content is preferably less than or equal to 0.5 percent, and the needle and flake content is preferably less than or equal to 10 percent; the embodiment has no special limitation on the strength grade and the fluidity of the fiber concrete, and the design and construction requirements can be met.

7. Grouting, wherein the grouting body used by the grouting body 5 comprises cement, fine aggregate, a water reducing agent, an expanding agent and water; in this example, the types of the water reducing agent and the swelling agent are not particularly limited. In this embodiment, the water reducing agent accounts for preferably 1 to 2% by weight of the cement used in the grout body. The mass percentage of the expanding agent in the cement dosage in the grouting body is preferably 6-8%. The water-to-cement ratio of the slip is preferably 0.8. The grouting pressure is preferably 0.4-2 MPa.

It is obvious to a person skilled in the art that the invention is not restricted to details of the above-described exemplary embodiments, but that it can be implemented in other specific forms without departing from the spirit or essential characteristics of the invention. The present embodiments are therefore to be considered in all respects as illustrative and not restrictive, the scope of the invention being indicated by the appended claims rather than by the foregoing description, and all changes which come within the meaning and range of equivalency of the claims are therefore intended to be embraced therein. Any reference sign in a claim should not be construed as limiting the claim concerned.

Furthermore, it should be understood that although the present description refers to embodiments, not every embodiment may contain only a single embodiment, and such description is for clarity only, and those skilled in the art should integrate the description, and the embodiments may be combined as appropriate to form other embodiments understood by those skilled in the art.

Claims (6)

1. The utility model provides a major diameter steel pipe friction pile anticorrosion protective layer, is equipped with steel pipe, its characterized in that including pouring the concrete core pile on the landslide body and sliding bed on the concrete core pile: and the steel pipe is sequentially provided with a fiber concrete protective layer, a polymer corrugated pipe and a grouting body from inside to outside.

2. The large-diameter steel pipe slide-resistant pile anticorrosion protective layer according to claim 1, characterized in that: the fiber concrete protective layer is formed by pouring fine stone fiber concrete, and steel fibers are added into the fine stone fiber concrete.

3. The large-diameter steel pipe slide-resistant pile anticorrosion protective layer according to claim 1, characterized in that: the diameter of the polymer corrugated pipe is 4-10cm larger than that of the steel pipe, and the diameter difference between the polymer corrugated pipe and the steel pipe is the thickness of the fiber concrete protective layer.

4. The large-diameter steel pipe slide-resistant pile anticorrosion protective layer according to claim 1, characterized in that: the cement paste used for the grouting body comprises cement, fine aggregate, a water reducing agent, an expanding agent and water.

5. The large-diameter steel pipe slide-resistant pile anticorrosion protective layer according to claim 4, characterized in that: the water reducing agent accounts for 1-2% of the cement amount in the grouting body by mass; the expanding agent accounts for 6-8% of the cement consumption in the grouting body by mass percent.

6. The large-diameter steel pipe slide-resistant pile anticorrosion protective layer according to claim 2, characterized in that: and a plurality of positioning brackets which are uniformly arranged are arranged in the fiber concrete protective layer.

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