CN111622212A

CN111622212A - Special-shaped pile

Info

Publication number: CN111622212A
Application number: CN201910153579.8A
Authority: CN
Inventors: 周兆弟
Original assignee: Individual
Current assignee: Individual
Priority date: 2019-02-28
Filing date: 2019-02-28
Publication date: 2020-09-04

Abstract

The invention provides a special-shaped pile, wherein a pile body of the special-shaped pile is provided with at least one pile body section, each pile body section is provided with at least two pile body section units, each pile body section unit is provided with at least one pile body section unit special-shaped part which is not parallel and level relative to a pile body base plane of the pile body section unit, adjacent pile body section units are identical in structure, and coordinate azimuth angles of corresponding pile body base planes of the adjacent pile body section units in a vertical plane of a center line of the pile body are not equal.

Description

Special-shaped pile

Technical Field

The invention relates to the technical field of prefabricated members in the building industry, in particular to a special-shaped pile.

Background

The concrete pile is a common foundation building material in the fields of building, traffic and port construction, and the appearance of the traditional concrete pile is generally a linear square pile or a circular tubular pile. Although the linear prestressed concrete pile has good anti-cracking performance and anti-seismic performance, the outer wall surface of the concrete pile body is a smooth circular surface or a rectangular surface, so that the friction between the pile body and a soil body is small, the pulling resistance and the bearing capacity of the pile body are small, when the large bearing capacity is required to be met, the length, the pile diameter or the number of the piles need to be increased, and the manufacturing cost of the whole pile foundation engineering can be increased.

In order to improve the uplift resistance of the pile body, the pile body of the precast concrete special-shaped pile disclosed in the Chinese patent CN102776880A is provided with the grooves which are continuously arranged along the axial direction, and the specific surface area of the pile body is enlarged by the grooves, so that the side friction force between the pile body and the soil body is greatly increased, and the uplift bearing capacity of the pile body is improved. For further improving the resistance to plucking of the pile body, chinese patent CN104358254B discloses a variable cross-section hollow square pile, which comprises a square pile body, wherein the square pile body comprises large-section square piles and small-section square piles which are arranged alternately, the large-section square piles and the small-section square piles enable the square pile body to form a concave-convex shape, and the concave-convex parts of the pile body block the soil body through occlusion, so that the friction between the square pile body and the soil is greatly improved, and the vertical resistance to plucking bearing capacity of the square pile body is greatly improved. However, in the variable cross-section pile, the diameters of the large-section pile body unit and the small-section pile body unit are different, and the bearing capacity of the two pile body units is greatly different, which affects the structural stability of the pile body to a certain extent.

Disclosure of Invention

The invention provides a special-shaped pile which can meet the requirement of pile body pulling resistance and has similar bearing capacity of each pile body unit, aiming at overcoming the problem of large difference of the bearing capacity of each pile body unit in the existing variable cross-section pile.

According to an embodiment of the present invention, the pile section unit special-shaped portion is a pile section unit concave portion that is concave with respect to the pile base surface of the pile section unit or a pile section unit convex portion that is convex with respect to the pile base surface of the pile section unit.

According to an embodiment of the present invention, the pile shape of the special-shaped pile is a polygon, the pile section unit special-shaped portion is a pile section unit concave portion that is concave relative to the pile section unit pile body base surface or a pile section unit convex portion that is convex relative to the pile section unit pile body base surface, the length of the pile section unit concave portion or the length of the pile section unit convex portion is not greater than the length of the corresponding pile section unit pile body base surface, and the width of the pile section unit concave portion or the width of the pile section unit convex portion is not greater than the width of the corresponding pile section unit pile body base surface.

According to an embodiment of the present invention, the pile shape of the special-shaped pile is a polygon, the pile section unit special-shaped portion is a pile section unit concave portion that is concave relative to a pile section unit base surface, a length of the pile section unit concave portion is identical to a length of a corresponding pile section unit pile base surface, and/or a width of the pile section unit concave portion is less than or equal to a width of the pile section unit pile base surface.

According to an embodiment of the present invention, the pile shape of the special-shaped pile is a polygon, the pile section unit special-shaped portion is a pile section unit concave portion that is concave relative to a pile body base plane of the pile section unit, a length of the pile section unit concave portion is smaller than a length of the corresponding pile body base plane of the pile section unit, and a width of the pile section unit concave portion is equal to a width of the pile body base plane of the pile section unit.

According to an embodiment of the invention the length of the pile section unit recess is larger than the length of the end of the pile section unit recess to the end of the pile section unit.

According to an embodiment of the invention, the average depth or the maximum depth of the pile body segment unit concave part, or the average height or the maximum height of the pile body segment unit convex part is 1/15-1/30 of the pile thickness of the corresponding pile body segment unit.

According to an embodiment of the present invention, a section line of the pile body section unit concave part or the pile body section unit convex part in the direction of the center line of the pile body is a multi-segment straight line or an arc line.

According to an embodiment of the present invention, a section line of the pile body section unit concave portion or the pile body section unit convex portion in the direction of the center line of the pile body forms a trapezoidal profile, and an included angle between the end side wall of the pile body section unit concave portion and the pile body base surface of the corresponding pile body section unit is greater than or equal to 90 degrees and less than 180 degrees.

According to an embodiment of the invention, the pile body section unit special-shaped part is provided with at least one or more convex ridges extending along the axial direction of the pile body, and two ends of each convex ridge respectively extend to two ends of the pile body section unit special-shaped part; or the pile body section unit special-shaped part is provided with at least one or more annular grooves or annular platforms along the circumferential direction of the pile body.

In summary, each pile body section unit in the special-shaped pile provided by the invention has the pile body section unit special-shaped part which is not flush with the pile body base surface of the pile body section unit, and the arrangement of the pile body section unit special-shaped part increases the specific surface area of the pile body section unit. When the pile body is sunk into the foundation, soil in the foundation can be embedded into the special-shaped part of the pile body section unit, so that the side friction force of the pile body is improved. Each pile body section is provided with at least two pile body section units, the adjacent pile body section units have the same structure, the coordinate azimuth angles of the corresponding pile body base planes of the adjacent pile body section units in the vertical plane of the central line of the pile body are unequal, the step is arranged in the special-shaped part of each pile body section unit or formed between the special-shaped part of each pile body section unit and the pile body base plane of the adjacent pile body section unit, when the pile body is sunk into the foundation, the step vertically blocks the soil body embedded into the special-shaped part of the pile body section unit, so that the vertical uplift bearing capacity of the pile body is increased, and the uplift resistance of the pile body is ensured. Further, because the adjacent pile body section units have the same structure, the bearing capacity of each unit is completely the same on the whole pile body. The special-shaped pile provided by the invention has the advantages that the uplift resistance is ensured, and the problem that the bearing capacities of the large-section pile body unit and the small-section pile body unit of the traditional bamboo joint pile are inconsistent is well solved. Further, the same structure of each pile body section unit on the pile body also makes when adopting pile embracing technology to carry out construction, to different pile body section units, pile embracing machine only need rotate certain angle pile embracing can, need not to change the centre gripping interval of embracing the pile arm, the problem that pile embracing made mistakes can not appear.

In the special-shaped pile mould provided by the invention, the special-shaped part of the mould shell section unit which is not flush with the inner wall base surface of the mould shell section unit is arranged in each mould shell section unit, so that the formed special-shaped pile is provided with the special-shaped part of the pile body section unit. The formwork comprises a formwork body and a formwork gasket fixed in the inner cavity of the formwork body, the formwork gasket has a profile matched with the special-shaped part of the pile body section unit, the arrangement enables the formwork gasket to be replaced according to the shapes of the different pile body section unit special-shaped parts when the concrete special-shaped pile is prefabricated, and the use is very convenient. And further, the mould shell body can use a traditional polygonal pile mould body or a tubular pile mould body without independent customization.

In order to make the aforementioned and other objects, features and advantages of the present invention comprehensible, preferred embodiments accompanied with figures are described in detail below.

Drawings

Fig. 1 is a schematic structural view of a special-shaped pile according to an embodiment of the present invention.

Fig. 2a shows a front view of the profiled pile shown in fig. 1.

Figure 2b shows an axial cross-section of the profiled pile shown in figure 1;

fig. 3 is an enlarged view of a pile section at E in fig. 1.

Fig. 4 shows an enlarged schematic view at F in fig. 2 a.

Fig. 5 is a schematic layout view of a special-shaped pile according to a second embodiment of the present invention.

Fig. 6 is a partial schematic view of a profiled pile provided in the third embodiment of the present invention.

Fig. 7 is a schematic structural diagram of a cross section of a special-shaped pile provided by the fourth embodiment of the invention.

Fig. 8 is a schematic structural view of a special-shaped pile mold according to a fifth embodiment of the present invention.

Fig. 9 is a cross-sectional view taken along line C-C of fig. 8.

Fig. 10 is an enlarged schematic view of a membrane shell segment configuration of fig. 9.

Fig. 11 is an enlarged schematic view at G in fig. 10.

Fig. 12 is a schematic structural view of the end plate and the membrane shell of the profiled pile die shown in fig. 8 after being disassembled.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings of the present invention, and it is obvious that the described embodiments are some embodiments of the present invention, but not all embodiments.

In the embodiments of the present invention, the term "more" is 2 or more than 2, and "more" includes "more than" and "less" includes "up to" and "within" and "up to" include "not including" more than "and" more than "does not include" and is not separately indicated below.

Example one

The present embodiment provides a special-shaped pile, a pile body of the special-shaped pile has at least one pile body segment, each pile body segment has at least two pile body segment units, each pile body segment unit has at least one pile body segment unit special-shaped portion that is not flush with a pile body base plane of the pile body segment unit, adjacent pile body segment units have the same structure, and coordinate azimuth angles of corresponding pile body base planes of the adjacent pile body segment units in a vertical plane of a center line of the pile body are not equal. The coordinate azimuth refers to an included angle between a certain straight line and a coordinate main shaft (X axis) in a plane rectangular coordinate system, and the included angle is from 0 to 360 degrees in the clockwise direction from the X axis. For convenience, the following is simply expressed as a corner between two piles (it will be understood by those skilled in the art that the corner is only expressed as an angle difference between the two piles in the spatial layout range, and does not limit the production or assembly manner between the two piles).

In the present embodiment, the body of the special-shaped pile has a plurality of pile sections 1, and each pile section 1 has two pile section units, namely a first pile section unit 11 and a second pile section unit 12. Correspondingly, the pile section unit special-shaped portion on the first pile section unit 11 is a first pile section unit special-shaped portion 111, and the second pile section unit special-shaped portion on the second pile section unit 12 is a second pile section unit special-shaped portion 121. However, the present invention is not limited thereto. In other embodiments, the pile body of the profiled pile may have only one pile body segment, and each pile body segment may also have more than three pile body segment units.

In this embodiment, as shown in fig. 1, the special-shaped pile is a square pile, which includes a plurality of pile body segment units connected in sequence and in a strip shape. However, the present invention is not limited thereto. In other embodiments, the shaped piles may be circular piles or other polygonal piles. It should be noted that the connection of pile sections or the connection of pile section units in the embodiments of the present invention refers to static connection (specifically, one-piece connection) of these pile sections or pile section units, and does not refer to dynamic connection of multiple pile sections or pile bodies into one piece. For convenience of description, the following description focuses on the structure of one of the pile body segment units in the profile pile with reference to fig. 3.

In this embodiment, the first pile section unit special-shaped portion 111 is a pile section unit concave portion (e.g., a trapezoid profile surface in fig. 3) recessed relative to a pile base surface (e.g., an i-shaped surface in fig. 3) of the first pile section unit 11. Likewise, the second pile section unit profile 121 is a pile section unit recess that is recessed relative to the pile base of the second pile section unit 12. However, the present invention is not limited thereto. In other embodiments, the pile section unit profile may be a pile section unit protrusion protruding out of the pile base surface of the pile section unit.

In this embodiment, as shown in fig. 1 and 3, the first pile section unit 11 has two first pile section unit profiles 111 thereon and the two first pile section unit profiles 111 are respectively formed on two opposite sides of the first pile section unit 11. The second pile section unit 12 has the same structure as the first pile section unit 11, and also includes two oppositely disposed second pile section unit profiles 121, and the spatial arrangement orientation of the two second pile section unit profiles 121 is different from the spatial arrangement orientation of the two first pile section unit profiles 111, and is represented by a 90-degree difference in fig. 3. At this time, if the coordinate azimuth angles of the pile body base planes where the two first pile body section unit special-shaped portions 111 are located in the vertical plane of the pile body center line are 0 degree and 180 degrees, the azimuth angles of the pile body base planes where the two second pile body section unit special-shaped portions 121 are located in the vertical plane of the pile body center line are 90 degrees and 360 degrees, that is, the coordinate azimuth angles of the pile body base planes where the first pile body section unit special-shaped portions are located and the pile body base planes where the second pile body section unit special-shaped portions are located are not equal. However, in other embodiments, two first pile section unit profiles 111 and two second pile section unit profiles 121 may also be formed on two adjacent sides of the corresponding pile section unit. These pile section unit profiles are in particular arranged on opposite or adjacent sides of the respective pile section units, which is not restricted by the invention.

In the present embodiment, the special-shaped pile is a square pile, so the second pile section unit 12 is rotated by 90 degrees and then connected to the first pile section unit 11. However, the present invention does not limit the rotation angle of the second pile section unit at all. The second pile section unit is rotated to realize that the base surface of the first pile section unit special-shaped part is not coplanar with the base surface of the second pile section unit special-shaped part. In other embodiments, when the profiled pile is a regular triangle pile, the rotation angle of the second pile section unit is 60 degrees. Or when the special-shaped pile is a regular polygon pile with more than five polygons, the rotation angle of the second pile body section unit is integral multiple of the internal angle of the regular triangle or the corresponding regular polygon.

The profiled pile provided by the embodiment is provided with each pile body as a first pile body section unit 11 and a second pile body section unit 12 which have the same structure and different spatial arrangement orientations. The first pile body section unit 11 is provided with a first pile body section unit special-shaped part 111 which is concave relative to the pile body base surface of the first pile body section unit 11, the specific surface area of the first pile body section unit 11 is increased due to the arrangement of the first pile body section unit special-shaped part 111, and when the pile body is sunk into a base, the specific surface area of the pile body increased by the first pile body section unit special-shaped part 111 increases the side friction between the side wall of the pile body and the soil body, so that the pulling resistance of the pile body is improved. Further, since the first pile section unit profiled portion 111 is recessed with respect to the pile body base surface of the first pile section unit 11, a first step 112 is formed on the first pile section unit; likewise, a second step 122 is also formed on the second pile section unit 12. When the special-shaped pile is sunk into the base, soil in the base is embedded into the special-shaped part 111 of the first pile body section unit and the special-shaped part 121 of the second pile body section unit, and at the moment, the first step 112 and the second step 121 respectively provide blocking force in the vertical direction for the embedded soil, so that the pulling resistance of the special-shaped pile is further improved through the blocking force, namely the special-shaped pile provided by the embodiment has good pulling resistance. Furthermore, because the first pile body section unit 11 and the second pile body section unit 12 have the same shape but different spatial layout orientations, each pile body section unit has the same bearing capacity, the whole pile body realizes the consistency of the bearing capacity of each unit on the pile body on the premise of ensuring the required uplift resistance, and the stability of the pile body structure is greatly improved. As each pile body section unit has higher structural strength compared with the small-diameter part of the original variable cross-section pile, the shearing resistance of the pile body is also improved on the basis of ensuring the pulling resistance.

In addition, the diameter of the large-section pile body unit is different from that of the small-section pile body unit, and the length of the two pile body units is different, and the length of the small-section pile body unit is usually far greater than that of the large-section pile body unit. The variable cross-section precast pile is generally driven by a pile embracing method, and the pile embracing position of a pile embracing machine is a large cross-section pile body unit during construction. Because the soil layer condition differs when piling, it has the difference to lead to advancing stake length and pile body bounce-back condition at every turn, and big cross-section pile body unit will probably no longer be in the pile embracing position of setting for after piling many times, appears the problem that pile embracing position made mistakes from this: if all pile holding positions are small-section pile body units, the pile body can not be held tightly; if the pile holding position is the combination position of the large-section pile body unit and the small-section pile body unit, the pile body of the combination part is damaged due to uneven stress. This embodiment is different from this, because the structure of first pile body section unit 11 and second pile body section unit 12 is the same completely and the reference surface of first pile body section unit abnormal shape portion 111 and the reference surface of second pile body section unit abnormal shape portion 121 are not coplane, there is no longer the pile body size difference of big cross-section pile body unit and small cross-section pile body unit in the pile body structure, so hold the stake machine need not to distinguish and hold big cross-section pile body unit or hold small cross-section pile body unit when adopting the pile-embracing method to carry out construction, only need rotate corresponding angle (the square pile is 90 degrees) on adjacent pile body and can realize holding the stake, the problem that the pile-embracing made mistakes because of the pile body diameter difference can not appear. The pile is very simple, and complex pile design is not needed.

In this embodiment, the length of the first pile section unit special-shaped portion 111 is smaller than the length of the first pile section unit 11, and the length of the first pile section unit special-shaped portion 111 is greater than the length from the end of the first pile section unit special-shaped portion 111 to the end of the first pile section unit 11. Further, the width of the first pile section unit special-shaped part 111 is equal to the width of the pile body base surface of the first pile section unit 11; the specific surface area of the pile body is increased to the maximum extent, demolding is facilitated, and the difficulty in mold design is facilitated to be simplified. However, the present invention is not limited thereto. As shown in the second embodiment, two ends of the first pile section unit special-shaped portion and two ends of the second pile section unit special-shaped portion extend to two ends of the first pile section unit and two ends of the second pile section unit respectively along the length direction of the pile body, that is, the lengths of the two pile section unit special-shaped portions are equal to the lengths of the corresponding pile section units. Alternatively, in other embodiments, the width of the first pile section unit profile and the width of the second pile section unit profile may be less than the width of the corresponding pile section unit pile base.

Furthermore, a plurality of ridges 113 extending along the axial direction of the pile body can be arranged on the first pile body section unit special-shaped part 111 and the second pile body section unit special-shaped part 121, and the arrangement of the ridges 113 can further increase the specific surface area of the pile body, thereby further improving the uplift resistance of the pile body. Of course, the longitudinal ridges 113 may be configured as transverse circumferential grooves or transverse lands.

The prestressed concrete pile is manufactured by pouring concrete in a mould in modes of material distribution, pumping and the like, and demoulding the mould after the concrete is solidified to finally form the prestressed concrete pile. Therefore, demoulding is required to be considered when the pile body structure of the special-shaped pile is designed. In this embodiment, as shown in fig. 2, the section lines of the first pile section unit special-shaped portion 111 and the second pile section unit special-shaped portion 121 in the direction of the center line of the pile body form a trapezoidal outline, and the included angle θ between the end side wall of the first pile section unit special-shaped portion 111 and the end side wall of the second pile section unit special-shaped portion 121 and the pile body base surface of the corresponding pile section unit is greater than or equal to 90 degrees and less than 180 degrees. The larger the included angle theta is, the easier the demoulding is; correspondingly, however, the vertical blocking force provided by the step on the pile section unit will be weaker, so that a balance between the two needs to be found. Preferably, as shown in fig. 4, the included angle θ is 145 degrees. However, the present invention is not limited thereto. In other embodiments, the included angle θ may be greater than or equal to 90 degrees and smaller than other angle values within 180 degrees, such as 150 degrees or 120 degrees.

Further, when designing the pile structure, the balance between the pile thickness of the pile and the blocking force of the step also needs to be considered. The greater the depth of the recess of the first pile body section unit special-shaped part and the second pile body section special-shaped part is, the greater the vertical blocking force provided by the step formed by the first pile body section unit special-shaped part and the second pile body section special-shaped part is, but the pile thickness of the corresponding pile body section unit is reduced, and the stability of the pile body is affected. Therefore, the maximum depth dmax of the first pile section unit special-shaped part 111 and the maximum depth dmax of the second pile section unit special-shaped part 111 are 1/15-1/30 of the corresponding pile section unit pile thickness D. Preferably, the maximum depth dmax is set to 1/20 of the pile thickness D. However, the present invention is not limited thereto. In other embodiments, the maximum depth dmax may be other values within 1/15-1/30 of the pile thickness D. Alternatively, in other embodiments, the average depth of the first pile section unit profile and the average depth of the second pile section unit profile may be defined to be 1/15-1/30 corresponding to the thickness of the pile of the corresponding pile section unit.

Example two

As shown in fig. 5, the basic structure of the present embodiment is the same as that of the first embodiment and its variation structure, except that: the two ends of the first pile section unit special-shaped part 111 extend to the two ends of the first pile section unit 11, and the two ends of the second pile section unit special-shaped part 121 extend to the two ends of the second pile section unit 12, that is, the length of the pile section unit special-shaped part is equal to that of the pile section unit. The second pile section unit 12 is connected to the first pile section unit 11 after rotating 90 degrees, which causes a first step 112 to be formed between the first pile section unit profile 111 and the pile base of the second pile section unit 2, and a second step 122 to be formed between the second pile section unit profile 121 and the pile base of the first pile section unit 11. Therefore, pile sections (similar to sections in bamboo joint piles, the section perimeter is larger than other parts) do not exist between the two pile body section units, and the pile embracing design is simpler and more convenient. In this embodiment, the first pile section unit special-shaped portion 111 and the second pile section unit special-shaped portion 121 also increase the specific surface area of the special-shaped pile, thereby improving the friction force of the pile body; the first step 112 and the second step 122 also provide vertical blocking force for soil bodies embedded in the special-shaped portions, and the special-shaped piles have good pulling resistance. Further, in this embodiment, first pile body section unit 11 and second pile body section unit 12 structure are the same completely, not only have the same bearing capacity between two pile body section units and embrace the stake machine when embracing the stake also only need rotate 90 degrees after can realize embracing the stake, the pile body need not to carry out complicated embracing the stake design, and this kind of mode conveniently designs mould structure and drawing of patterns mode also is more simple and convenient.

EXAMPLE III

As shown in fig. 6, the present embodiment is substantially the same as the first embodiment and its modified structure, except that: the first pile section unit 11 has a first pile section unit profile 111; likewise, the second pile section unit 12 also has only one second pile section unit profile 121. The second pile section unit 12 is rotated 180 degrees and then connected to the first pile section unit 11, and the side of the pile where the first pile section unit special-shaped portion 111 is located is parallel to the side of the pile where the second pile section unit special-shaped portion 121 is located. At this time, if the coordinate azimuth angle of the pile body base plane on which the first pile body section unit special-shaped portion is located in the vertical plane of the pile body center line is 0 degree, the azimuth angle of the pile body base plane on which the second pile body section unit special-shaped portion is located in the vertical plane of the pile body center line is 180 degrees, that is, the two coordinate azimuth angles are not equal.

Because the first pile body section unit special-shaped part 111 is concave relative to the pile body base surface of the first pile body section unit, a first step 112 is formed between the first pile body section unit special-shaped part and the first pile body section unit; similarly, a second step 122 is also formed between the second pile section unit profile 121 and the pile body base of the second pile section unit 12. In this embodiment, the first pile section unit special-shaped portion 111 and the second pile section unit special-shaped portion 121 also increase the specific surface area of the special-shaped pile, thereby improving the friction force of the pile body; the first step 112 and the second step 122 also provide vertical blocking force for soil bodies embedded in the special-shaped portions, and the special-shaped piles have good pulling resistance. Further, in the present embodiment,

the first pile body section unit 11 and the second pile body section unit 12 are completely the same in structure, the two units not only have the same bearing capacity, but also can realize pile holding only by rotating the pile holding machine by 90 degrees and shifting the pile holding machine by a small amplitude when the pile is held, and the pile body does not need to carry out complicated pile holding design; furthermore, the mode is convenient for designing the die structure and the demoulding mode is simple.

In addition, the embodiment of the invention can also be provided with other numbers of special-shaped parts, and the special-shaped parts with the same serial number in the pile body segment unit can be ensured to have spatial orientation difference.

Example four

As shown in fig. 7, the present embodiment is substantially the same as the first embodiment and its variations, except that: the special-shaped pile is a round pile. In this embodiment, the first pile section unit 11 has two first pile section unit profile portions 111; likewise, the second pile section unit has two second pile section unit profiles thereon (not shown for reasons of perspective).

The second pile section unit is rotated 90 degrees and then connected to the first pile section unit 11. However, the rotation angle of the second pile section unit of the present invention is not limited at all. In other embodiments, when the profiled pile is a circular pile, the second pile section unit can rotate by other angle values within more than 0 degrees and less than 90 degrees. Alternatively, in other embodiments, when only one first pile section unit profile is provided on the first pile section unit and only one second pile section unit profile is provided on the second pile section unit, the second pile section unit can rotate more than 0 degrees and less than other angular values within 360 degrees, such as 30 degrees, 45 degrees, 180 degrees, etc.

In this embodiment, the first pile section unit special-shaped portion 111 and the second pile section unit special-shaped portion also increase the specific surface area of the special-shaped pile, thereby improving the side friction force of the pile. The first step 112 formed between the first pile body section unit special-shaped part 111 and the pile body base surface of the first pile body section unit 11 and the second step formed between the second pile body section unit special-shaped part and the pile body base surface of the first pile body section unit can also provide vertical blocking force for soil bodies embedded into the special-shaped parts, and the special-shaped pile has good uplift resistance. Further, in this embodiment, the first pile body section unit 11 and the second pile body section unit 12 have the same structure, the two units have the same bearing capacity, and the pile embracing machine can embrace a pile only by rotating 90 degrees when embracing the pile, and the pile body does not need to carry out a complicated pile embracing design; furthermore, the mode is convenient for designing the die structure and the demoulding mode is simple.

EXAMPLE five

As shown in fig. 8 to 12, this embodiment provides a special-shaped pile mold, which includes a detachable elongated form a (split form, generally an upper form and a lower form), and end plates B at two ends of the form, where the form a has a plurality of form sections a1, each form section has at least two form section units, and each form section unit has at least one form section unit special-shaped portion that is not flush with an inner wall base of the form section unit, where adjacent form section units have the same structure, and a coordinate azimuth angle of a corresponding inner wall base of the adjacent form section units in a vertical plane of a form center line is not equal, so that a receiving space of the special-shaped pile in the first forming embodiment is obtained after the form a and the end plates B at two ends are closed. For convenience, it will be simply stated that there is a corner between the two mold shell segments (as will be understood by those skilled in the art, the corner is merely expressed as the angular difference between the two in terms of spatial layout, and is not intended to limit the manner of production or assembly between the two).

Corresponding to the profiled pile in the first embodiment, in the present embodiment, the formwork a has a plurality of formwork sections a1, and each formwork section a1 includes two formwork section units, which are a first formwork section unit a11 and a second formwork section unit a 12. The shell section unit shaped portion on the first shell section unit a11 is a first shell section unit shaped portion a111, and the shell section unit shaped portion on the second shell section unit a12 is a second shell section unit shaped portion a 121. However, the present invention is not limited thereto. In other embodiments, the formwork of the profiled pile mould may have only one formwork section, and each formwork section may also have more than three formwork section units.

In this embodiment, each formwork includes a formwork body a10 and a formwork gasket (block) a20, and the formwork gasket a20 is detachably fixed to an inner cavity of the formwork body a10, and the formwork gasket a20 has a contour matching with the profiled portion of the pile section unit of the profiled pile in the first embodiment. The formwork gasket A20 can be detachably arranged, so that the formwork gasket can be replaced according to the shapes of different pile body section unit special-shaped parts when the concrete special-shaped pile is prefabricated, and the use is very convenient. And further, the mould shell body can be a traditional polygonal pile mould body or a tubular pile mould body, and independent customization is not needed. However, the present invention is not limited thereto. In other embodiments, the profile matching the special-shaped part of the pile section unit can be directly arranged on the inner wall of the formwork, that is, the special-shaped part of the pile section unit can be directly formed by arranging a groove or a boss on the inner wall of the formwork body.

In the first embodiment, the special-shaped piles are square piles, so that the inner cavity of the formwork is correspondingly square. However, the present invention is not limited thereto. In other embodiments, the interior of the formwork can be circular or polygonal. In this embodiment, the first form section unit profiled portion A111 is a form section unit convex portion that is convex relative to a first form section unit inner wall base surface. Similarly, the second form section unit profile portion A121 is a form section unit projection that is convex relative to an inner wall base of the second form section unit A12. However, the present invention is not limited to this. In other embodiments, the form section unit profiled portion can be a form section unit recess that is recessed relative to a form section unit interior wall base.

In this embodiment, the second form section unit A12 is rotated 90 degrees and then attached to the first form section unit A11. However, the invention is not limited to the angle of rotation of the second form section unit, and the rotation of the second form section unit A12 is such that the base of the first form section unit profile A111 is not coplanar with the base of the second form section unit profile A121. In other embodiments, when the shaped pile is a regular triangle pile, the rotation angle of the second formwork section unit is 60 degrees. Or when the special-shaped pile is a regular polygon pile with more than five polygons, the rotation angle of the second formwork section unit is an integral multiple of the inner angle of the regular triangle or the corresponding regular polygon.

In this embodiment, the formwork body a10 has four formwork sections, as shown in fig. 12, a first formwork section a10-1 and a third formwork section a10-3 are disposed opposite to each other and both have a first formwork section unit profile portion a 111. The second formwork section A10-2 and the fourth formwork section A10-4 are arranged oppositely and both have a second formwork section unit special-shaped part A121. However, the present invention is not limited thereto. As shown in FIG. 4, the second membrane shell split body A10-2 is provided with two concrete pumping ports A10-2-1 arranged along the length direction of the membrane shell. However, the number of concrete pumping ports and the positions of the concrete pumping ports are not limited in the present invention. In other embodiments, the number of the concrete pumping ports may be one or more than three, and the concrete pumping ports may also be disposed on the first membrane shell division body, the third membrane shell division body, and the fourth membrane shell division body.

The first form section unit a11 has two first form section unit profile portions a111 thereon and the two first form section unit profile portions a111 are formed on two opposing interior walls of the first form section unit a11, respectively. The second form section unit A12 has the same configuration as the first form end unit A11, and also includes two oppositely disposed second form section unit profile portions A121, the spatial arrangement orientation of the two second form section unit profile portions A121 being different from the spatial arrangement orientation of the two first form section unit profile portions A111. However, in other embodiments, two first form section unit profiles A111 and two second form section unit profiles A121 can be formed on adjacent interior walls of the respective form section units. The form section units are particularly arranged on opposite or adjacent side walls of the respective form section unit, which is not a limitation of the present invention.

Further, in this embodiment, the length of the first form section unit shaped portion a111 is less than the length of the inner wall base of the first form section unit a11 and the length of the first form section unit shaped portion a111 is greater than the length from the end of the first form section unit shaped portion a111 to the end of the first form section unit a 11. Further, the width of the corresponding first form section unit special-shaped portion a111 is equal to the width of the pile body base surface of the first form section unit a 11. However, the present invention is not limited thereto. In other embodiments, both ends of the shaped portion of the first form section unit and both ends of the shaped portion of the second form section unit can extend to both ends of the first form section unit and both ends of the second form section unit along the length direction of the mold, respectively, i.e., the lengths of the shaped portions of the two form section units are equal to the lengths of the corresponding form section units. Alternatively, in other embodiments, the width of the profiled portion of the first form section unit and the width of the profiled portion of the second form section unit can be less than the width of the corresponding interior wall base of the form section unit. Further, a plurality of formwork convex ridges a113 extending along the axial direction of the formwork section unit corresponding to the convex ridges 113 in the first embodiment are formed on the special-shaped part of the first formwork section unit and the special-shaped part of the second formwork section unit, and can also be configured as ring grooves.

Further, in order to facilitate the demolding of the pile body, a trapezoidal outline formed by a section line of the first formwork section unit special-shaped portion A111 in the direction of the center line of the mold is arranged, and an included angle between the side wall of the end portion of the first formwork section unit special-shaped portion A111 and the inner wall base plane of the corresponding formwork section unit A11 is 145 degrees. Similarly, the second form section unit profile portion A121 is of the same configuration as the first form section unit profile portion A111. Corresponding to the special-shaped pile of the first embodiment, the maximum height tmax of the bulge of the special-shaped part A111 of the first formwork section unit and the maximum height tmax of the bulge of the special-shaped part A121 of the second formwork section unit are 1/15-1/30 of the width T of the accommodating space at the corresponding formwork section unit. Preferably, the maximum height tmax is set at 1/20 of the width T of the receiving space.

In summary, each pile body section unit in the special-shaped pile provided by the invention has the pile body section unit special-shaped part which is not flush with the pile body base surface of the pile body section unit, and the arrangement of the pile body section unit special-shaped part increases the specific surface area of the pile body section unit. When the pile body is sunk into the foundation, soil in the foundation can be embedded into the special-shaped part of the pile body section unit, so that the side friction force of the pile body is improved. The method is characterized in that each pile body section is provided with at least two pile body section units, the adjacent pile body section units have the same structure, the coordinate azimuth angles of the corresponding pile body base planes of the adjacent pile body section units in the vertical plane of the central line of the pile body are unequal, the step is formed in the special-shaped part of each pile body section unit or between the special-shaped part of each pile body section unit and the pile body base plane of the adjacent pile body section unit, and when the pile body is sunk into the foundation, the step vertically blocks the soil body embedded into the special-shaped part of the pile body section unit, so that the vertical uplift bearing capacity of the pile body is increased, and the uplift resistance of the pile body is ensured. Further, because the adjacent pile body section units have the same structure, the bearing capacity of each unit is completely the same on the whole pile body. The special-shaped pile provided by the invention has the advantages that the uplift resistance is ensured, and the problem that the bearing capacities of the large-section pile body unit and the small-section pile body unit of the traditional bamboo joint pile are inconsistent is well solved. Further, the same structure of each pile body section unit on the pile body also makes when adopting pile embracing technology to carry out construction, to different pile body section units, pile embracing machine only need rotate certain angle pile embracing can, need not to change pile embracing diameter, the problem that pile embracing made mistakes can not appear.

Although the present invention has been described with reference to the preferred embodiments, it should be understood that various changes and modifications can be made therein by those skilled in the art without departing from the spirit and scope of the invention as defined by the appended claims.

Claims

1. The special-shaped pile is characterized in that a pile body of the special-shaped pile is provided with at least one pile body section, each pile body section is provided with at least two pile body section units, each pile body section unit is provided with at least one pile body section unit special-shaped part which is not level relative to a pile body base plane of each pile body section unit, adjacent pile body section units are identical in structure, and coordinate azimuth angles of corresponding pile body base planes of the adjacent pile body section units in a vertical plane of a center line of the pile body are not equal.

2. A profiled pile as claimed in claim 1, wherein the pile section unit profiled part is a pile section unit concave part that is concave relative to the pile section unit base surface or a pile section unit convex part that is convex relative to the pile section unit base surface.

3. A profiled pile as claimed in claim 1, wherein the profiled pile has a polygonal pile shape, the pile section unit profiled part is a pile section unit concave part that is concave relative to the pile section unit pile body base surface or a pile section unit convex part that is convex relative to the pile section unit pile body base surface, the length of the pile section unit concave part or the length of the pile section unit convex part is not greater than the length of the corresponding pile section unit pile body base surface, and the width of the pile section unit concave part or the width of the pile section unit convex part is not greater than the width of the corresponding pile section unit pile body base surface.

4. A profiled pile as claimed in claim 1, characterized in that the profiled pile has a polygonal pile shape, the pile section unit profiled part is a pile section unit recess recessed relative to the pile section unit base surface, the length of the pile section unit recess corresponds to the length of the corresponding pile section unit pile base surface, and/or the width of the pile section unit recess is equal to or less than the width of the pile section unit pile base surface.

5. A profiled pile as claimed in claim 1, wherein the profiled pile has a polygonal pile shape, the pile section unit profiled part is a pile section unit recess recessed relative to a pile section unit base surface, the length of the pile section unit recess is less than the length of the corresponding pile section unit pile base surface, and the width of the pile section unit recess is equal to the width of the pile section unit pile base surface.

6. A profiled pile as claimed in claim 5, characterised in that the length of the pile section unit recess is greater than the length of the end of the pile section unit recess to the end of the pile section unit.

7. A profiled pile as claimed in claim 2, wherein the average depth or maximum depth of the pile section unit recesses, or the average height or maximum height of the pile section unit projections is 1/15-1/30 of the corresponding pile section unit pile thickness.

8. A profile pile according to claim 2, wherein a section line of the pile body section unit concave part or the pile body section unit convex part in a direction of a center line of the pile body is a multi-segment straight line or an arc line.

9. The profile pile according to claim 8, wherein a section line of the pile body section unit concave portion or the pile body section unit convex portion in the direction of the center line of the pile body forms a trapezoidal profile, and an included angle between the end side wall of the pile body section unit concave portion and the basal plane of the pile body of the corresponding pile body section unit is 90 degrees or more and less than 180 degrees.

10. A profiled pile as claimed in claim 1, characterised in that the pile body section unit profiled portion has at least one or more ridges extending in the axial direction of the pile body, each ridge extending at both ends to the ends of the pile body section unit profiled portion respectively; or the pile body section unit special-shaped part is provided with at least one or more annular grooves or annular platforms along the circumferential direction of the pile body.