CN108118692A - Fibre reinforced composites regenerate masonry aggregate concrete hollow steel pipe pile - Google Patents

Abstract

The invention discloses a kind of fibre reinforced composites to regenerate masonry aggregate concrete hollow steel pipe pile, including hollow steel pipe, the concrete layer being sheathed on outside the steel pipe, the fibre reinforced composites cloth being sheathed on outside the concrete layer, the fibre reinforced composites cloth is Nian Jie with the concrete layer by epoxy resin layer.In such hollow pile, fibre reinforced composites cloth can ensure the corrosion resistance and bearing capacity of hollow pile, the setting of steel pipe and fibre reinforced composites cloth can reduce the weight of hollow pile, reduce the requirement to pile foundation lifting appliance etc., it is transported convenient for construction, manufacture cost can be reduced, regeneration masonry aggregate concrete can ensure the frost resistance and impact resistance of hollow pile.

Description

Fiber-reinforced composite recycled masonry aggregate concrete steel pipe hollow pile

technical field

The invention relates to the technical field of construction, in particular to a fiber-reinforced composite recycled masonry aggregate concrete steel pipe hollow pile.

Background technique

In current buildings, reinforced concrete piles are generally used for support. When ordinary concrete piles are used, they will be subject to sulfate corrosion, fresh water corrosion, magnesium salt corrosion, carbonic acid corrosion, general acid corrosion, strong alkali corrosion, and compound salts in the environment (such as seawater, groundwater, saline-alkali soil, etc.) Erosion by corrosive substances such as corrosion. In the cold northern regions, especially in the soil environment exposed to water and frozen, multiple freeze-thaw cycles are prone to occur, which will have a negative impact on the durability of concrete piles and reduce their bearing capacity. Under the pressure of the foundation, it breaks and loses its bearing function.

With the rapid development of the world economy, the scale of buildings has also entered a period of rapid development. On the one hand, with the increasingly serious population problem, people’s accommodation contradictions are also deepening, and high-rise buildings and even super high-rise buildings are also built; on the other hand, with the advancement of urbanization, more and more high-rise buildings Large buildings such as shopping malls and hotels are constantly being built. The larger the scale of the building, the higher the requirements for the mechanical properties of the pile such as impact resistance.

Therefore, how to provide a corrosion-resistant and impact-resistant pile body is currently a technical problem to be solved by those skilled in the art.

Contents of the invention

In view of this, the object of the present invention is to provide a fiber-reinforced composite recycled masonry aggregate concrete steel pipe hollow pile, which has better corrosion resistance and stronger impact resistance.

To achieve the above object, the present invention provides the following technical solutions:

A fiber-reinforced composite material regenerated masonry aggregate concrete steel pipe hollow pile, comprising a hollow steel pipe, a concrete layer sheathed outside the steel pipe, a fiber-reinforced composite material cloth sheathed outside the concrete layer, the fiber The reinforced composite material cloth is bonded to the concrete layer through an epoxy resin layer, and the concrete layer is a recycled masonry aggregate concrete layer.

Preferably, several fiber-reinforced composite material cloths are spliced sequentially along the axial direction, and one fiber-reinforced composite material cloth is covered in the gap between axially adjacent fiber-reinforced composite material cloths.

Preferably, the fiber-reinforced composite material cloth is rectangular.

Preferably, the axial width of the fiber-reinforced composite material cloth is larger than the axial width of the fiber-reinforced composite material cloth covered on the edge gap.

Preferably, the fiber-reinforced composite cloth has an axial width of 300 mm and a thickness ranging from 1 mm to 1.5 mm.

Preferably, the end section of the fiber-reinforced composite material cloth is overlapped with the initial section in the circumferential direction.

Preferably, the outer diameter of the steel pipe is 1/2 of the outer diameter of the concrete layer, the wall thickness of the steel pipe is 5 mm, and the steel pipe is a Q235 steel pipe.

Preferably, the fiber-reinforced composite cloth is carbon fiber cloth, aramid fiber cloth, glass fiber cloth or basalt fiber cloth.

Preferably, the cross section of the steel pipe is circular, rectangular or triangular.

The fiber-reinforced composite material recycled masonry aggregate concrete steel pipe hollow pile includes a hollow steel pipe, a concrete layer sleeved outside the steel pipe, and a fiber-reinforced composite material cloth sleeved outside the concrete layer. The fiber-reinforced composite material cloth is bonded to the concrete layer through an epoxy resin layer. Wherein, the concrete layer is a recycled masonry aggregate concrete layer.

The appearance of the hollow pile is set as fiber reinforced composite material cloth. Fiber Reinforced Plastic (FRP) is an advanced composite material with corrosion resistance and extremely high tensile strength.

The hollow pile is wrapped by a lightweight, high-strength, corrosion-resistant fiber-reinforced composite material cloth, which can protect the hollow pile against corrosion. The fiber-reinforced composite cloth will not be corroded. At the same time, the fiber-reinforced composite cloth also isolates the concrete layer from the external environment, preventing corrosive media from invading into the fiber-reinforced composite cloth, and preventing the concrete layer and the internal steel pipe from being corroded to cause hollowness. The reduction of the bearing capacity of the pile can reduce the maintenance workload of the hollow pile in the later stage, prolong the service life of the hollow pile, and reduce the maintenance cost; the density of the fiber-reinforced composite material cloth is small, and its use can reduce the self-weight of the hollow pile; the fiber-reinforced composite The material cloth has excellent mechanical properties, especially its extremely high tensile strength, which is about ten times that of steel bars. During the compression process of the hollow pile, the core pile body of the hollow pile located in the fiber-reinforced composite material cloth will not only be subjected to axial pressure, but also be subjected to the annular constraint force provided by the outsourcing fiber-reinforced composite material cloth, so that the core pile body is in the Under the state of three-way circumferential force, the compressive strength and ultimate bearing capacity of the core pile body can be greatly improved.

The interior of the hollow pile adopts the combination of steel pipe and concrete layer. The steel pipe can provide a certain degree of ductility for the hollow pile, which can effectively overcome the brittle failure of the concrete layer and improve the seismic performance of the hollow pile, so that the hollow pile can be widely used in multi-shock In disaster-prone areas, at the same time, the combination of steel pipes and concrete layers can reduce the use of concrete layers to a certain extent, reduce the weight of hollow piles, and reduce the cost of hollow piles.

Using recycled masonry aggregate concrete, compared with ordinary concrete, its dead weight is small, and its frost resistance and impact resistance are better.

The epoxy resin layer is used to bond the fiber-reinforced composite material cloth and the concrete layer, and the connection stability is better.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings that need to be used in the description of the embodiments or the prior art. Obviously, the accompanying drawings in the following description are only It is an embodiment of the present invention, and those skilled in the art can also obtain other drawings according to the provided drawings without creative work.

Fig. 1 is the axial sectional view of hollow pile provided by the present invention;

Fig. 2 is a top view of the hollow pile provided by the present invention.

In Fig. 1 to Fig. 2, 1-fiber-reinforced composite material cloth, 2-epoxy resin layer, 3-concrete layer, 4-steel pipe.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

The core of the invention is to provide a fiber-reinforced composite recycled masonry aggregate concrete steel pipe hollow pile, which has good corrosion resistance and strong impact resistance.

Please refer to Figure 1 and Figure 2, Figure 1 is an axial sectional view of the hollow pile provided by the present invention; Figure 2 is a top view of the hollow pile provided by the present invention.

In a specific embodiment of the fiber-reinforced composite material recycled masonry aggregate concrete steel pipe hollow pile provided by the present invention, it includes a hollow steel pipe 4, a concrete layer 3 sleeved outside the steel pipe 4, and a concrete layer sleeved outside the concrete layer 3. Fiber-reinforced composite material cloth 1 , fiber-reinforced composite material cloth 1 is bonded to concrete layer 3 through epoxy resin layer 2 . That is, the hollow pile includes four material layers of steel pipe 4 , concrete layer 3 , epoxy resin layer 2 , and fiber-reinforced composite cloth 1 from inside to outside in the radial direction, and the central axis of the steel pipe 4 is the central axis of the hollow pile. In this embodiment, the fiber-reinforced composite material cloth 1 can ensure the corrosion resistance and bearing capacity of the hollow pile, and the arrangement of the steel pipe 4 and the fiber-reinforced composite material cloth 1 can reduce the weight of the hollow pile and reduce the load on the pile foundation lifting equipment, etc. Requirements, convenient construction and transportation, can reduce manufacturing costs.

Wherein, the concrete layer 3 may be a recycled masonry aggregate concrete layer. Recycled masonry aggregate concrete is made of recycled masonry aggregate after masonry is crushed, which is replaced by a certain proportion of natural aggregate to make recycled masonry aggregate concrete. Recycled masonry aggregate concrete can be any concrete made of masonry aggregate in any proportion instead of natural aggregate. Compared with ordinary concrete, recycled masonry aggregate concrete has lower self-weight, better frost resistance and impact resistance.

Among them, a specific production method of the recycled masonry aggregate concrete layer is: masonry aggregate replaces 50% of the small particle size coarse aggregate (5mm-10mm), and mixes it with a certain amount of water reducing agent in a certain mixing ratio Prepare. The mixing method is to add sand and brick aggregate first, stir for 30 seconds, then add half of the water and stir for 30 seconds to ensure that the brick aggregate is saturated with water; add cement and stir for 60 seconds, then add the other half of water and stir for 60 seconds.

Specifically, several fiber-reinforced composite material cloths 1 can be spliced sequentially along the axial direction, and a fiber-reinforced composite material cloth 1 is covered in the gap between axially adjacent fiber-reinforced composite material cloths 1 . In this embodiment, the fiber-reinforced composite material cloth 1 is equivalent to two layers, and the fiber-reinforced composite material cloth 1 of the outer layer can block the gaps of the fiber-reinforced composite material cloth 1 of the inner layer, so that the hollow pile can be realized. Comprehensive corrosion protection in the axial direction. Wherein, one fiber-reinforced composite material cloth 1 can wrap more than one circle around the concrete layer 3, for example, in the inner fiber-reinforced composite material cloth 1, each fiber-reinforced composite material cloth 1 can be wound four times around the central axis of the hollow pile, or , in the inner fiber-reinforced composite material cloth 1, each fiber-reinforced composite material cloth 1 can be wound three times around the central axis of the hollow pile.

Further, the fiber-reinforced composite material cloth 1 can be in a rectangular shape, which is convenient for processing and assembly. When assembling, it is only necessary to make the width direction of the fiber-reinforced composite material cloth 1 parallel to the central axis of the hollow pile, and along the circumferential direction of the concrete layer 3 Just wrap it around. Certainly, the fiber-reinforced composite material cloth 1 may also be in a circular, triangular or other shape.

Further, the axial width of the fiber-reinforced composite material cloth 1 may be greater than the axial width of the fiber-reinforced composite material cloth 1 covered on the edge gap, and one outer layer of fiber-reinforced composite material cloth 1 only covers two The gaps formed between the fiber-reinforced composite material cloths 1 can reduce the consumption of the fiber-reinforced composite material cloth 1 in the outer layer while ensuring the sealing effect.

Further, the axial width of the fiber-reinforced composite material cloth 1 can be 300 mm, and the thickness ranges from 1 mm to 1.5 mm, and the anti-corrosion effect is better.

Further, the end section and the initial section of the fiber reinforced composite material cloth 1 in the circumferential direction can be stacked, that is, the circumferential length of the fiber reinforced composite material cloth 1 is greater than an integer multiple of the outer diameter of the concrete layer 3 at the corresponding position, so that It can guarantee the comprehensive anti-corrosion of the hollow pile in the circumferential direction.

Wherein, each fiber-reinforced composite material cloth 1 can be wound on the concrete layer 3 more than once, and the end face of the fiber-reinforced composite material cloth 1 in the circumferential direction has a certain lap length relative to the initial end face in the circumferential direction. Taking the lap length as 150mm, the thickness of the fiber reinforced composite material cloth 1 as 1mm, and the perimeter of the concrete layer 3 as an example, the thickness of the fiber reinforced composite material cloth 1 can be ignored at this time, and the fiber reinforced composite material cloth 1 surrounds Between one circle and two circles, a length of 150mm will be extended when surrounding the whole circle. At this time, the total circumferential length of the fiber reinforced composite material cloth 1 is 2πr+150mm, and r is the radius of the concrete layer 3; When the composite material cloth 1 wraps between two and three turns, it will extend a length of 150 mm when it goes around two complete turns. At this time, if the thickness of the fiber reinforced composite material cloth 1 is negligible, the circumferential direction of the fiber reinforced composite material cloth 1 The total length is 2×2πr+150mm, r is the radius of the concrete layer 3; when the fiber-reinforced composite material cloth 1 wraps between three and four turns, it will extend out to a length of 150mm when it goes around the full three turns. At this time, if the fiber The thickness of reinforced composite material cloth 1 is negligible, the total circumferential length of fiber reinforced composite material cloth 1 is 3×2πr+150mm, r is the radius of concrete layer 3; and so on, it can be known that fiber reinforced composite material cloth 1 surrounds N Between circles and (N+1) circles, a length of 150 mm will be extended when surrounding the entire N circles. At this time, if the thickness of fiber reinforced composite material cloth 1 is neglected, the total circumferential length of fiber reinforced composite material cloth 1 It is N×2πr+150mm, r is the radius of the concrete layer 3, and N is a positive integer.

Alternatively, the one fiber-reinforced composite material cloth 1 wound at least twice may also be replaced with different fiber-reinforced composite material cloths 1 connected end to end in sequence.

Further, the outer diameter of the steel pipe 4 can be 1/2 of the outer diameter of the concrete layer 3, the wall thickness of the steel pipe 4 can be 5mm, and the steel pipe 4 can be a Q235 steel pipe, which can ensure the bearing capacity of the hollow pile. Wherein, the outer diameter of the concrete layer 3 should be determined according to the specific construction site conditions.

On the basis of any of the above-mentioned embodiments, the fiber-reinforced composite material cloth 1 can be carbon fiber cloth, aramid fiber cloth, glass fiber cloth or basalt fiber cloth. Of course, other types of lightweight, high-strength, corrosion-resistant fiber reinforcements can also be used. Composite material cloth1.

On the basis of any of the above-mentioned embodiments, the cross section of the steel pipe 4 is circular, rectangular or triangular, so as to adapt to different construction environments.

A kind of specific processing mode of hollow pile provided by the present invention is as follows:

Step 1. First make a prefabricated template with a length a, then cut the steel pipe 4 so that the length of the steel pipe 4 is equal to a and connect it to the prefabricated template. At the same time, make the central axis of the steel pipe 4 and the central axis of the pile body, that is, the center of the cylindrical steel mold The axes coincide.

Step 2. Pour the recycled masonry aggregate concrete into the formwork. After the pouring is completed, perform maintenance. After one day of maintenance, the formwork is removed and sent to the construction site for further maintenance.

Step 3. After 7 days of maintenance period, select several fiber reinforced composite material cloths 1 of standard width, start to paste fiber reinforced composite material cloth 1, mix epoxy resin and use wet bonding method, , after one fiber-reinforced composite material cloth 1 is pasted, the upper side of the next fiber-reinforced composite material cloth 1 is close to the lower side of the previous fiber-reinforced composite material cloth 1 and stuck to the concrete layer 3, and this cycle continues After pasting, if the required width of the last fiber-reinforced composite material cloth 1 is less than the above-mentioned standard width, the fiber-reinforced composite material cloth 1 can be cut and pasted after cutting. Wherein, when pasting a certain fiber reinforced composite material cloth 1, the surface of the concrete layer 3 corresponding to the fiber reinforced composite material cloth 1 is filled with epoxy resin with a brush to form an epoxy resin layer 2, and at the same time, it is also coated with epoxy resin. Brush fiber reinforced composite cloth1.

Step 4: After a layer of fiber-reinforced composite material cloth 1 is pasted, another fiber-reinforced composite material cloth 1 is pasted on the gap between every two fiber-reinforced composite material cloth 1, specifically, its width is 100mm , the lap length is 150mm, and then continue to maintain.

Step 5. When the age of 28 days is met, transport the hollow pile to the piling place, adjust the position of the pile driver, align the pile tip with the pile position, and drive the pile below the surface by hammering, and the vertical deviation shall not exceed 0.5%. .

Each embodiment in this specification is described in a progressive manner, each embodiment focuses on the difference from other embodiments, and the same and similar parts of each embodiment can be referred to each other.

The fiber-reinforced composite recycled masonry aggregate concrete steel pipe hollow pile provided by the present invention has been introduced in detail above. In this paper, specific examples are used to illustrate the principle and implementation of the present invention, and the descriptions of the above embodiments are only used to help understand the method and core idea of the present invention. It should be pointed out that for those skilled in the art, without departing from the principles of the present invention, some improvements and modifications can be made to the present invention, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims (9)

1. A fiber-reinforced composite material regenerated masonry aggregate concrete steel pipe hollow pile is characterized in that it comprises a hollow steel pipe (4), a concrete layer (3) that is sleeved outside the steel pipe (4), and is sleeved on the steel pipe (4). The fiber reinforced composite material cloth (1) outside the concrete layer (3), the fiber reinforced composite material cloth (1) is bonded to the concrete layer (3) through the epoxy resin layer (2), and the concrete Layer (3) is the recycled masonry aggregate concrete layer. 2. The hollow pile of fiber-reinforced composite material recycled masonry aggregate concrete steel pipe according to claim 1, characterized in that several fiber-reinforced composite material cloths (1) are spliced sequentially along the axial direction, adjacent to each other in the axial direction A fiber-reinforced composite material cloth (1) is covered at the gap between the fiber-reinforced composite material cloths (1). 3. The fiber-reinforced composite material recycled masonry aggregate concrete steel pipe hollow pile according to claim 2, characterized in that the fiber-reinforced composite material cloth (1) is rectangular. 4. The hollow pile of fiber-reinforced composite material recycled masonry aggregate concrete steel pipe according to claim 3, characterized in that, the axial width of the fiber-reinforced composite material cloth (1) is greater than that covered on the edge gap. The axial width of the fiber reinforced composite material cloth (1). 5. The fiber-reinforced composite material recycled masonry aggregate concrete steel pipe hollow pile according to claim 4, characterized in that the axial width of the fiber-reinforced composite material cloth (1) is 300 mm, and the thickness ranges from 1 mm to 1.5 mm. mm. 6. The fiber-reinforced composite material recycled masonry aggregate concrete steel pipe hollow pile according to claim 2, characterized in that, the end section of the fiber-reinforced composite material cloth (1) in the circumferential direction overlaps with the initial section . 7. The fiber-reinforced composite material regenerated masonry aggregate concrete steel pipe hollow pile according to claim 5, characterized in that, the outer diameter of the steel pipe (4) is 1/ of the outer diameter of the concrete layer (3) 2. The wall thickness of the steel pipe (4) is 5 mm, and the steel pipe (4) is a Q235 steel pipe. 8. The fiber-reinforced composite material recycled masonry aggregate concrete steel pipe hollow pile according to any one of claims 1 to 7, wherein the fiber-reinforced composite material cloth (1) is carbon fiber cloth, aramid fiber cloth , glass fiber cloth or basalt fiber cloth. 9. The fiber-reinforced composite material recycled masonry aggregate concrete steel pipe hollow pile according to claim 8, characterized in that the cross section of the steel pipe (4) is circular, rectangular or triangular.