CN220620078U

CN220620078U - Multi-support-disc composite pile

Info

Publication number: CN220620078U
Application number: CN202321412867.9U
Authority: CN
Inventors: 郭财宝; 蒋建洪; 杨晓军; 李易豪
Original assignee: Individual
Current assignee: Individual
Priority date: 2023-05-29
Filing date: 2023-06-05
Publication date: 2024-03-19
Anticipated expiration: 2033-06-05

Abstract

The utility model provides a multi-support-disc composite pile, which is formed in a pile hole of a stratum, extends downwards from the ground, is divided into a soft soil layer and a non-soft soil layer in a stratum structure, and is particularly divided into a main hole which is penetrated up and down and is distributed at intervals along the longitudinal direction, the reaming is arranged in the range of the non-soft soil layer, the diameter of the main hole is enlarged outwards along the main hole, the enlarged diameter part at the reaming position is called a support disc, the existence of the support disc is convenient for fully utilizing the side friction resistance of the support disc in the non-soft soil layer, the integral pulling-resistant compressive strength of the multi-support-disc composite pile is improved, and the prefabricated pipe pile and cement soil in the pile hole are solidified to jointly form the multi-support-disc composite pile.

Description

Multi-support-disc composite pile

Technical Field

The utility model relates to the field of pile foundation construction, in particular to a multi-support-disc composite pile.

Background

Along with the continuous rapid development of modern construction, the scale of foundation construction is continuously enlarged, the height of a building is continuously increased, piles are required to be driven on the ground to improve the strength and bearing capacity of a foundation during construction of the building, the existing pile foundations which are commonly used are generally divided into two types, namely a cast-in-place pile and a precast pile, the cast-in-place pile is formed on the ground by means of mechanical drilling, steel pipe soil extrusion or manual excavation on an engineering site, a reinforcement cage is placed in the hole, concrete is poured into the reinforcement cage, and the pile foundation supported by the building is obtained after the concrete is solidified; the precast pile is a prefabricated slender concrete member, and is transported to a construction site after being manufactured and pressed into the ground by a pile machine. The construction equipment of the cast-in-place pile is simple, the application range is wide, the operation is convenient, but the problems of long construction period, slurry pollution, high construction cost and the like exist, the construction cost of the precast pile is low, the construction speed is high, but the construction needs large machines, the construction site is large, the soil squeezing effect exists, and the adverse effect on surrounding structures can be caused.

The cement-soil composite pile is developed in the market at present, and combines a cement stirring pile and a prestressed pipe pile, so that the cement-soil composite pile has the advantages of high pile body material strength of the prestressed pipe pile and high pile side resistance of the cement-soil pile, and the soil squeezing problem of the precast pile is effectively solved.

An anchor rod stiff composite pile disclosed in publication No. CN204370406U has large diameter of cement soil piles at the periphery, uniform diameter from top to bottom and high bearing capacity, but cannot show the advantages of large-diameter piles in soft soil layers.

Or as disclosed in publication No. CN102409670B, the static drill root planting pile is enlarged at the lower part of the pile placing hole, so that the bearing capacity of the pile bottom bearing layer can be exerted more greatly, the stirring diameter is smaller, and the manufacturing cost is relatively low. However, if there is a better stratum above the bearing layer, the side friction resistance cannot be fully utilized, and waste is caused.

Disclosure of Invention

In order to solve the technical problems, the utility model aims to provide a multi-support-disc composite pile, wherein in the application process, the construction stratum structure is firstly investigated and surveyed, the distribution of soft soil layers and non-soft soil layers is determined, the diameter of pile holes is designed according to the stratum distribution, the size of main holes which are vertically penetrated is selected in the soft soil layers so as to save cost, the diameter of the non-soft soil layers is enlarged by outward extending counterbores, support discs are formed at the diameter enlarging positions, and the side friction resistance of the support discs in the non-soft soil layers and the end resistance of the upper end surfaces and the lower end surfaces of the support discs are conveniently and fully utilized, so that the whole compression resistance and the pulling resistance bearing capacity of the multi-support-disc composite pile are improved.

The technical scheme of the utility model is realized as follows:

a multi-support-disc composite pile is formed in a pile hole of a stratum, the stratum structure is divided into a soft soil layer and a non-soft soil layer along the depth direction of the pile hole, the pile hole is divided into a main hole which is penetrated up and down and reaming holes which are distributed at intervals along the longitudinal direction, the reaming holes are formed by outwards extending the main hole in a non-soft soil layer, the pile hole is formed by injecting cement paste and soil through stirring and forming, precast piles are implanted in the main hole, the cement paste is mixed with the soil, the precast piles and the cement soil in the pile hole are formed together after being solidified, the composite pile forms a pile body in the main hole, and a supporting disc with the diameter larger than that of the pile body is formed at the reaming hole position.

Preferably, the diameter of the precast pile is smaller than the diameter of the main hole. The diameter of the precast pile is slightly smaller than that of the main hole, and cement soil formed by grouting and stirring before pile planting is filled between the main hole and the outer wall of the precast pile.

Preferably, one or more support disks are provided in the same or in adjacent non-soft soil layers. According to the actual thickness of the non-soft soil layer and specific geological conditions, the number of the supporting discs is selected as required in the same non-soft soil layer or a plurality of adjacent non-soft soil layer depth ranges, and when the thickness of the non-soft soil layer is large, a plurality of supporting discs can be arranged on the pile body along the axial direction.

Preferably, in the same non-soft soil layer or adjacent non-soft soil layers, when a plurality of support disks exist, the height of the support disk and the distance between two adjacent support disks are 1: 1-5. The height of the support disc is 1m-3m, and the clear distance between two adjacent support discs is 1m-15m. The heights of the supporting disks are selected according to the specific thickness of the non-soft soil layer, and the distance between the adjacent supporting disks is set according to the proportion by taking the self heights of the two supporting disks into consideration.

Preferably, the support disc is in an outward convex trapezoid shape, the upper end face of the support disc is a plane or an inclined plane, the side face of the support disc is a vertical longitudinal cylindrical surface, and the bottom face of the support disc is a plane or an inclined plane. The upper end inclined plane or plane of the supporting disc is helpful for increasing the anti-pulling bearing capacity of the pile body, the vertical side surface of the supporting disc is helpful for utilizing side friction resistance, and the plane bottom surface or inclined bottom surface of the supporting disc is helpful for increasing the compression bearing capacity of the supporting disc.

Preferably, the section of the precast pile is round or square or polygonal or irregularly shaped. The precast pile is wrapped in cement soil, and the shape and the structure of the precast pile can be selected according to the actual condition of engineering construction.

Preferably, the bottom of the pile body is provided with an enlarged part, and the diameter of the enlarged part is larger than or equal to the diameter of the supporting disc. The arrangement of the amplifying part is favorable for improving the side friction resistance and the end resistance born by the bottom of the pile, so that the anti-pulling and compression bearing capacity of the multi-disc composite pile is greatly improved, the diameter of the amplifying part can be larger than that of the supporting disc, and the corresponding proper diameter can be selected according to stratum conditions.

Preferably, the precast pile is a combination of various prestressed pipe piles or various prestressed solid and hollow square piles or various prestressed special-shaped piles or prestressed bamboo joint piles or various types of piles, and the precast pile is required to be implanted into pile holes before cement soil is solidified. The selection of the type of the precast pile does not affect the utility of the multi-disc composite pile, and after the precast pile is implanted before the cement soil is solidified, the precast pile stands still for maintenance, and the precast pile and the cement soil are combined and solidified to form the complete multi-disc composite pile.

The principle and beneficial effects of the utility model adopting the technical scheme are as follows:

the utility model provides a multi-support disc composite pile, the stratum structure of which is divided into a soft soil layer and a non-soft soil layer, pile holes required by the stratum extend downwards from the ground, the pile holes are obtained by spraying cement slurry by a spraying drilling tool and continuously stirring with soil, or drilling after high-pressure water, slurry and air are cut and stirred to form cement soil, the pile holes are divided into a main hole which penetrates up and down and reaming holes which are distributed at intervals along the longitudinal direction, the reaming holes are arranged in the range of the non-soft soil layer, the reaming holes can also be arranged in the soft soil layer under special conditions, the diameter is enlarged outwards along the main hole, the diameter is enlarged at the reaming position, the supporting disc is convenient to fully utilize the resistance of the supporting disc in the non-soft soil layer, the compression resistance and the anti-pulling bearing capacity of the whole multi-support disc composite pile are improved, the precast pile and the cement soil in the pile holes are jointly formed into the multi-support disc composite pile after being solidified, the composite pile has few limiting conditions on the engineering construction environment in the use process, the small-diameter pile body can be designed under the requirement of the same bearing capacity, namely the consumption materials are less, the construction cost is low, the protection is helpful, the waste of the mud is reduced, the mud is not wasted, and the composite pile is still has the advantages of large-width and is reduced.

Drawings

FIG. 1 is a pile hole forming diagram of a multi-disc composite pile;

FIG. 2 is a process diagram of a precast pile implanted in a pile hole;

FIG. 3 is a schematic diagram of the final forming structure of a multi-tray composite pile;

the reference numerals are as follows: 1-ground, 2-pile holes, 21-main holes, 22-reaming, 3-supporting discs, 4-cement soil, 5-amplifying parts and 6-precast piles.

Description of the embodiments

In order that the above-recited objects, features and advantages of the present utility model will be more clearly understood, a more particular description of the utility model will be rendered by reference to the appended drawings and appended detailed description. It should be noted that, in the case of no conflict, the embodiments of the present application and the features in the embodiments may be combined with each other.

In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present utility model, however, the present utility model may be practiced in other ways than those described herein, and therefore the scope of the present utility model is not limited to the specific embodiments disclosed below.

The specific embodiments of the present utility model are as follows:

as shown in fig. 1-3, the present utility model provides a multi-supporting-disc composite pile, the composite pile is formed in a pile hole 2 of a stratum, the pile hole 2 extends downwards from the ground 1, the stratum structure along the depth direction of the pile hole 2 is divided into a soft soil layer and a non-soft soil layer, soft soil generally refers to cohesive soil in a soft plastic-plastic state with large natural water content, high compressibility, low bearing capacity and very low shear strength, soft soil is often subdivided into soft cohesive soil, mucky soil, silt, peat soil and the like in engineering, and correspondingly, the stratum except the soft soil layer is collectively referred to as the non-soft soil layer; the pile hole 2 is obtained by spraying cement slurry by a spraying drilling tool and continuously stirring with soil, or drilling after high-pressure water, slurry and air cutting stirring to form cement soil 4, wherein the cement soil 4 is formed by stirring and mixing cement slurry or dry cement with soil, the pile hole 2 is divided into a main hole 21 which is penetrated up and down and reaming 22 which are distributed at intervals along the longitudinal direction, the reaming 22 is formed by radially outwards extending the main hole 21 in a non-soft soil layer, a precast pile 6 is inserted in the main hole 21, the precast pile 6 and the cement soil 4 in the pile hole 2 are solidified to form a composite pile together, a pile body is formed at the position of the main hole 21, and a supporting disc 3 with the diameter larger than that of the pile body is formed at the position of the reaming 22.

Specifically, as shown in fig. 2, the diameter of the precast pile 6 is slightly smaller than that of the main hole 21, and cement soil 4 formed by grouting and stirring during the formation of the pile hole 2 is filled between the outer wall of the precast pile 6 and the main hole 21.

Further, in the same non-soft soil layer or a plurality of adjacent non-soft soil layers, one or a plurality of supporting discs 3 can be arranged according to the actual thickness and specific geological conditions of the non-soft soil layers, and in special cases, the non-soft soil layers can also be arranged in the soft soil layers, as shown in fig. 1-3, when the thickness of the non-soft soil layers is larger, a plurality of supporting discs 3 can be arranged at intervals outside the pile hole 2.

Further, in the same non-soft soil layer or a plurality of adjacent non-soft soil layers, when there are a plurality of support discs 3, the height of the support disc 3 needs to be selected according to the specific thickness of the non-soft soil layer, and the distance between two adjacent support discs 3 needs to be set by considering the respective self heights of the two support discs 3, as shown in fig. 1-3, the height of the support disc 3 and the distance between the two adjacent support discs 3 can be 1:1-5, the height of the support discs 3 being 1-3m, the spacing between two adjacent support discs 3 being 1-15m.

Meanwhile, as shown in fig. 1-3, the shape of the supporting disc 3 is in an outwards convex trapezoid shape, the upper end face of the supporting disc 3 is a plane or an inclined plane, so that the anti-pulling bearing capacity of the pile body is increased, the upward resistance of the supporting disc is increased, the side face of the supporting disc 3 is a vertical longitudinal cylindrical surface, the side friction resistance of the supporting disc is effectively utilized, the bottom face of the supporting disc 3 is a plane or an inclined plane, and the anti-compression bearing capacity of the supporting disc 3 is improved.

Further, the section of the precast pile 6 is circular, square, polygonal or special-shaped, the precast pile 6 is wrapped in the soil cement 4, and the section selection of the precast pile 6, i.e. the geometric shape of the precast pile 6, can be determined according to the stress condition, the construction condition and the construction condition actually required by the engineering.

And as shown in fig. 1-3, the bottom of the pile body is provided with an amplifying part 5, the diameter of the amplifying part 5 is larger than or equal to that of the supporting disc 3, the arrangement of the amplifying part 5 is beneficial to improving the side friction resistance and the end resistance born by the bottom of the pile, so that the compression resistance and the pulling resistance bearing capacity of the multi-disc composite pile are greatly improved, the diameter of the amplifying part 5 can be larger than that of the supporting disc 3, and the corresponding proper diameter is specifically selected according to the stratum condition.

Still further, the precast pile 6 is a prestressed pipe pile or a prestressed solid, hollow square pile or a prestressed special-shaped pile or a prestressed bamboo joint pile or the mutual combination of various piles, the selection of the type of the precast pile 6 does not affect the utility of the multi-disc composite pile, the precast pile 6 is required to be placed in the pile hole 2 before the cement soil 4 is solidified, the precast pile 6 is required to stand for maintenance after being placed in the precast pile 6, and the precast pile 6 and the cement soil 4 are combined and solidified to finally form the complete multi-disc composite pile.

As shown in fig. 1-3, the multi-disc composite pile is constructed as follows:

step one: geological investigation is carried out in advance on a construction site, distribution of soft soil layers and non-soft soil layers in a stratum structure is determined, parameters such as pile length, pile body diameter, position, height, number and diameter of supporting discs of the multi-disc composite pile are designed according to bearing capacity calculation results, and pile position centers are selected to prepare cement paste.

Step two: starting construction equipment, spraying a drilling tool to stir, drilling and sinking to form a main hole 21 of the pile hole 2 of the multi-disc composite pile, wherein the diameter of the main hole 21 is larger than that of the precast pile 6, spraying the drilling tool to continuously spray cement paste, stirring and mixing the cement paste and soil in the ground to obtain cement soil 4, and continuously injecting the cement soil 4 into the pile hole 2 in the drilling process to stir and mold.

Step three: when the jet drilling tool runs downwards to reach the non-soft soil layer, an expansion stirring blade of the jet drilling tool is opened, or the diameter of the pile hole 2 is expanded by using high-pressure water, slurry and air to obtain a reaming 22, a supporting disc 3 with a trapezoid shape is formed at the reaming 22, and when the jet drilling tool reaches the bottommost part of the target depth, the bottom of the pile hole 2 is expanded to form an amplifying part 5.

Step four: after the pile hole 2 is formed, prefabricated piles 6 prepared in advance are needed to be planted before the cement soil 4 in the pile hole 2 is solidified.

Step five: the precast pile 6 is planted at the bottom of the pile hole 2, stands still for curing, and finally is cured into a plurality of disc composite piles.

The utility model and its embodiments have been described above by way of illustration and not limitation, and the utility model is illustrated in the accompanying drawings and described in the drawings in which the actual structure is not limited thereto. Therefore, if one of ordinary skill in the art is informed by this disclosure, the structural mode and the embodiments similar to the technical scheme are not creatively designed without departing from the gist of the present utility model.

Claims

1. A multi-support-disc composite pile is characterized in that: the composite pile is formed in a pile hole of a stratum, the stratum structure is divided into a soft soil layer and a non-soft soil layer along the depth direction of the pile hole, the pile hole is divided into a main hole which is communicated up and down and reaming holes which are distributed at intervals along the longitudinal direction, the reaming holes are formed by outwards extending the main hole in the non-soft soil layer, the composite pile is formed by solidifying cement soil in a precast pile and the pile hole, the precast pile is implanted into the main hole after the cement soil is injected into the pile hole, the cement soil is formed by mixing cement slurry and soil, the composite pile forms a pile body in the main hole, and a supporting disc with the diameter larger than that of the pile body is formed at the reaming hole position.

2. A multi-disc composite pile according to claim 1, wherein: the diameter or the peripheral dimension of the precast pile is smaller than the diameter or the dimension of the main hole.

3. A multi-disc composite pile according to claim 1, wherein: in the same or adjacent non-soft soil layers, one or more support discs are provided.

4. A multi-disc composite pile according to claim 3, wherein: in the same non-soft soil layer or a plurality of adjacent non-soft soil layers, when a plurality of supporting disks are arranged, the height of the supporting disk and the interval between the two adjacent supporting disks are 1:1-5, the height of the supporting discs is 1m-3m, and the distance between two adjacent supporting discs is 1m-15m.

5. A multi-disc composite pile according to claim 1, wherein: the support disc is in an outward convex trapezoid shape, the upper end face of the support disc is an inclined plane or a plane, the side face of the support disc is a vertical longitudinal face, and the bottom face of the support disc is an inclined plane or a plane.

6. A multi-disc composite pile according to claim 1, wherein: the section appearance of precast pile is circular or square or polygon or dysmorphism.

7. A multi-disc composite pile according to claim 1, wherein: the pile body bottom is equipped with the enlargement portion, the diameter of enlargement portion is greater than or equal to the supporting disk diameter.

8. A multi-disc composite pile according to claim 1, wherein: the precast pile is a prestressed round pile, a hollow square pile, a solid square pile and a special-shaped pile, and the precast pile is implanted into a pile hole before cement soil is solidified.