CN210712824U - Reinforced composite pile based on miniature pile - Google Patents

Abstract

The utility model relates to a reinforcement type composite pile based on miniature stake, it includes miniature stake, miniature stake's periphery is equipped with interior fender section of thick bamboo, interior fender section of thick bamboo's periphery is equipped with outer fender section of thick bamboo, miniature stake's middle part is equipped with drilling along its length direction, place the steel reinforcement cage in the drilling, still place bottom end confined slip casting steel pipe in the drilling, to pour the aggregate into in the drilling, utilize the rotatory mechanical shower nozzle spun injection cutting of high jet from bottom to top, the inner wall that strikes drilling to form the hole enlargement, to successively pour into clear water and cement thick liquid into in the slip casting steel pipe and wash and consolidate, make cement thick liquid and aggregate consolidation form composite pile. The utility model discloses a miniature stake hole enlargement of minor diameter increases stake diameter and surface area, improves single stake bearing capacity by a wide margin, and can improve the ability of horizontal load, reaches foundation reinforcement purpose.

Description

Reinforced composite pile based on miniature pile

Technical Field

The utility model relates to a foundation stabilization handles technical field, especially relates to a reinforcement type composite pile based on miniature stake.

Background

The high-pressure rotary spraying is characterized in that a drilling machine is used for drilling, a grouting steel pipe with a nozzle is inserted to a preset position of a soil layer, high-pressure equipment is used for enabling slurry to be high-pressure jet, the high-pressure slurry is sprayed out from the nozzle, the process of cutting the soil body through rotary lifting impact is adopted, and after the slurry is solidified, a consolidation body and soil among piles are formed in the soil to form a composite foundation, so that the bearing capacity of the foundation is improved, the deformation of the foundation is reduced, and the purpose of foundation consolidation is achieved.

The miniature pile is a small-diameter cast-in-place pile, the diameter of the pile is less than 400mm, the slenderness ratio is more than 30, and the material is generally reinforced concrete. The miniature pile is generally formed by three steps of drilling, placing reinforcing steel bars and grouting to form the pile.

The micro pile transfers friction force to soil layers through grouting to provide bearing capacity, part of load is born by reinforced concrete, the cross section and the surface area of the pile are increased to improve the bearing capacity of the pile, and the volume of steel members in the micro pile is almost half of the volume of a formed hole.

Compared with a large cast-in-place pile, the bearing capacity provided by the miniature pile is relatively small, when the construction of some large cast-in-place piles is limited, the miniature pile can only be adopted, but the bearing capacity of the miniature pile is low, and the design requirement is difficult to meet.

SUMMERY OF THE UTILITY MODEL

To prior art not enough, the utility model provides a reinforcement type composite pile based on miniature stake, through the miniature stake hole enlargement of minor diameter, increase stake diameter and surface area improve single stake bearing capacity by a wide margin, and can improve the ability of horizontal load, reach foundation reinforcement purpose.

The utility model provides a technical scheme that its technical problem adopted is: reinforced composite pile based on miniature stake includes miniature stake, its characterized in that: the method comprises the following steps that an inner protecting cylinder is arranged on the periphery of a miniature pile, an outer protecting cylinder is arranged on the periphery of the inner protecting cylinder, a drill hole is formed in the middle of the miniature pile along the length direction of the miniature pile, a reinforcement cage is placed in the drill hole, a grouting steel pipe with a closed bottom end is placed in the drill hole, aggregate is poured into the drill hole, jet fluid sprayed by a spray head of a high-jet machine rotating and lifting from bottom to top is used for cutting and impacting the inner wall of the drill hole to form expanding, clean water and cement slurry are sequentially injected into the grouting steel pipe for cleaning and solidification, and the cement slurry and the aggregate are solidified to form the composite pile.

In the present invention, the depth of the drilled hole is drilled to the rock-socketed depth in a preferred embodiment of the reinforced composite pile based on the micro pile.

The utility model provides a reinforced composite pile's a preferred embodiment based on miniature stake, the usable shower nozzle high pressure rotation injection fluid pore-forming of drilling, just adopt the dredge pump drainage mud sediment in it in the drilling.

In the utility model provides a reinforced composite pile based on micropile's a preferred embodiment, the mechanical shower nozzle spun of high pressure heater can form the through length hole enlargement or form calabash cluster form hole enlargement or form arbitrary section degree of depth hole enlargement with the drilling.

In a preferred embodiment of the reinforced composite pile based on the micro-pile of the present invention, the injection fluid is a slurry with a ratio of water to cement of 0.8: 1-1: 1.

In the utility model provides a reinforced composite pile's a preferred embodiment based on micropile, the cement thick liquid adopts P.O42.5 cement above grade to can add concrete admixture.

The utility model provides a reinforced composite pile's a preferred embodiment based on miniature stake, the slip casting steel pipe is located in the steel reinforcement cage or outside the steel reinforcement cage, just the slip casting steel pipe is tied up in the steel reinforcement cage.

The utility model provides a in a preferred embodiment of reinforcement type composite pile based on miniature stake, the slip casting steel pipe can set up a plurality ofly, and in a plurality of slip casting steel pipes can keep somewhere composite pile, just slip casting steel pipe lower part plum blossom is described and is bored and establish the flower eye grout outlet.

In the utility model provides a preferred embodiment of reinforcement type composite pile based on micropile, but the side direction is loosened to interior casing and outer casing all adoption fender section of thick bamboo.

Compared with the prior art, the utility model provides a reinforcement type composite pile based on miniature stake's beneficial effect is: the utility model discloses drill at the middle part of miniature stake and establish the drilling to set up steel reinforcement cage and slip casting steel pipe in the drilling, to pour into the aggregate in the drilling, utilize the rotatory shower nozzle spun of the high jet machinery that promotes from bottom to top to spray the inner wall that the shower nozzle spun and cut, assault the drilling and expand the hole, inject into grout and aggregate consolidation after expanding the hole and form composite pile, can effectively reinforce the ground, and make the pile footpath expand, improve pile body reinforced concrete cross-section and surface area, promote vertical and horizontal bearing load ability, its method is simple, high-efficient, easy to carry; the method is suitable for reinforcing complex foundations, foundations which need to bear large loads and are limited by manual hole digging piles or large mechanical equipment; the pile hole can be expanded to any section of depth, the advantages of the miniature pile and the jet grouting pile are combined, the construction efficiency is high, an operator does not need underground construction compared with a manual hole digging pile, the labor intensity of a constructor is reduced, the pile hole digging device is not limited by a site compared with a large mechanical cast-in-place pile, the bearing capacity of the pile hole digging device is higher than that of a common miniature pile, the foundation is ensured to be reinforced by high-strength slurry, and the bearing capacity of the composite pile foundation is far higher than that of the common miniature pile.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained without inventive work, wherein:

fig. 1 is an initial construction state diagram of a high-pressure jet grouting stage of a reinforced composite pile based on a micro pile provided by the utility model;

fig. 2 is a middle-stage construction state diagram of the high-pressure jet grouting stage of the reinforced composite pile based on the micro-pile provided by the utility model;

fig. 3 is a later stage construction state diagram of the high pressure jet grouting stage of the reinforced composite pile based on the micro-pile provided by the utility model;

fig. 4 is the utility model provides a structure schematic diagram after cement thick liquid of reinforcement type composite pile based on micropile pours into.

Detailed Description

The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus, should not be construed as limiting the present invention; the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; furthermore, unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, as they may be fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

Referring to fig. 1 to 4, the reinforced composite pile based on the micro pile includes a micro pile 11, an inner pile casing 12 is disposed on the periphery of the micro pile 11, an outer pile casing 13 is disposed on the periphery of the inner pile casing 12, the inner pile casing 12 and the outer pile casing 13 in this embodiment both adopt pile casings capable of being laterally loosened, and the distance between the inner pile casing 12 and the outer pile casing 13 is set according to design requirements;

a drill hole 112 is formed in the middle of the micro pile 11 along the length direction of the micro pile, the drill hole 112 is drilled to the rock-socketed depth or the designed depth, the drill hole 112 in the embodiment can be formed by jetting fluid through a nozzle in a high-pressure rotating mode, and sludge in the drill hole 112 is discharged through a sewage pump;

a reinforcement cage 14 is placed in the borehole 112, a grouting steel pipe 15 with a closed bottom is also placed in the borehole 112, in this embodiment, the grouting steel pipe 15 is arranged in the reinforcement cage 14 or outside the reinforcement cage 14, and the grouting steel pipe 15 can be bound to the reinforcement cage;

in this embodiment, a plurality of grouting steel pipes 15 may be provided, a plurality of grouting steel pipes 15 may be left in the composite pile, and a plum blossom-shaped hole (not shown in the figure) is drilled at the lower part of the grouting steel pipe 15;

pouring aggregate 16 into the drill hole 112, and cutting and impacting the inner wall of the drill hole to expand the diameter by using a jet fluid sprayed by a spray head 20 of a high-speed jet machine rotating and lifting from bottom to top, wherein the jet fluid in the embodiment adopts slurry with the ratio of water to cement being 0.8: 1-1: 1, the jet fluid sprayed by the spray head 20 of the high-speed jet machine in the embodiment can expand the diameter of the drill hole in a full length manner or in a gourd string shape or in any section of depth, and clean water and cement slurry are injected into the grouting steel pipe 15 in sequence for cleaning and consolidation, so that the cement slurry and the aggregate 16 are consolidated to form a composite pile, the cement slurry adopts cement with the grade of more than P.O42.5, and concrete additives can be added.

The composite pile body of the embodiment comprises the following steps:

s1: arranging an inner protecting cylinder at the periphery of the miniature pile, wherein the inner diameter of the inner protecting cylinder is not smaller than the pile diameter of the miniature pile, the outer protecting cylinder is protected at the outer side of the inner protecting cylinder, the distance between the outer protecting cylinder and the inner protecting cylinder is determined according to the design distance, and the inner protecting cylinder and the outer protecting cylinder are both higher than the ground of the foundation;

s2: drilling a drill hole in the middle of the miniature pile, and placing a reinforcement cage in the drill hole;

s3: placing the installed guide pipe with the closed bottom end into the hole bottom of the drilled hole, aligning the drilled hole by adopting a high-pressure jet machine, placing a spray head covered by a spray nozzle to a preset depth, and pouring aggregate with a certain particle size to a certain distance above the spray head;

s4: rotating the spray head from bottom to top within the designed depth range to enable high-pressure fluid to pass through the inner wall of the impact drill hole, enabling the fluid to lift mud residues to return from the drill hole, and continuously supplementing aggregate in the process of lifting the spray head to enable the spray head not to extend out of the aggregate;

s5: and after the spray boom is lifted out, injecting clear water into the grouting steel pipe to flush the pipe orifice closure of the grouting steel pipe, cleaning mud in the expanded drill hole upwards to return clear water to the orifice, then injecting thick cement slurry to enable the slurry to flow out of the pipe bottom of the grouting steel pipe and enter the aggregate, shaking and lifting the grouting steel pipe up and down, continuously supplementing the cement slurry to the grouting steel pipe until the thick cement slurry overflows from the drill hole, then supplementing the thick cement slurry at high pressure through the grouting steel pipe, finally lifting the grouting steel pipe or the retaining pile out, and dismantling the protective sleeve.

It is worth noting that: when the spray head enters the inner and outer protective cylinders, the fluid pressure needs to be reduced, and the high-speed spraying out of the aggregate is prevented from hitting personnel or smashing equipment.

The above only is the embodiment of the present invention, not limiting the scope of the present invention, all the equivalent structures or equivalent processes made by the present specification can be changed, or directly or indirectly applied to other related technical fields, and all the same principles are included in the protection scope of the present invention.

Claims (9)

1. The utility model provides a reinforcement type composite pile based on miniature stake, includes miniature stake, its characterized in that: the method comprises the following steps that an inner protecting cylinder is arranged on the periphery of a miniature pile, an outer protecting cylinder is arranged on the periphery of the inner protecting cylinder, a drill hole is formed in the middle of the miniature pile along the length direction of the miniature pile, a reinforcement cage is placed in the drill hole, a grouting steel pipe with a closed bottom end is placed in the drill hole, aggregate is poured into the drill hole, jet fluid sprayed by a spray head of a high-jet machine rotating and lifting from bottom to top is used for cutting and impacting the inner wall of the drill hole to form expanding, clean water and cement slurry are sequentially injected into the grouting steel pipe for cleaning and solidification, and the cement slurry and the aggregate are solidified to form the composite pile.

2. The micropile-based reinforced composite pile of claim 1, wherein: the depth of the bore hole is drilled to the depth of the rock-socketed.

3. The micropile-based reinforced composite pile of claim 1 or 2, wherein: the drill hole can be formed by jetting fluid by utilizing the high-pressure rotation of the spray head, and the sludge in the drill hole is pumped and discharged by adopting a sewage pump.

4. The micropile-based reinforced composite pile of claim 1, wherein: the jet fluid sprayed by the spray head of the high-pressure jet machine can form the through-length diameter expansion of the drill hole, the calabash string-shaped diameter expansion or any section of depth diameter expansion.

5. The micropile-based reinforced composite pile of claim 1 or claim 4, wherein: the spraying fluid is slurry with the ratio of water to cement being 0.8: 1-1: 1.

6. The micropile-based reinforced composite pile of claim 1, wherein: the cement slurry adopts cement with the P.O42.5 grade and can be added with concrete additives.

7. The micropile-based reinforced composite pile of claim 1, wherein: the slip casting steel pipe is arranged in the steel reinforcement cage or outside the steel reinforcement cage, and the slip casting steel pipe is bound to the steel reinforcement cage.

8. The micropile-based reinforced composite pile of claim 1 or 7, wherein: the grouting steel pipes can be arranged in a plurality of numbers, the grouting steel pipes can be kept in the composite pile, and the flower hole grout outlet is drilled in a plum blossom shape at the lower part of the grouting steel pipe.

9. The micropile-based reinforced composite pile of claim 1, wherein: the inner protective cylinder and the outer protective cylinder are both protective cylinders which can be laterally loosened.

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