CN111188354A

CN111188354A - Foundation structure and construction method

Info

Publication number: CN111188354A
Application number: CN202010105333.6A
Authority: CN
Inventors: 郭全元; 钟仕兴; 顾慧; 曾胜强
Original assignee: China Railway Siyuan Survey and Design Group Co Ltd; Guangzhou Holding Co of China Railway Siyuan Survey and Design Group Co Ltd
Current assignee: China Railway Siyuan Survey and Design Group Co Ltd; Guangzhou Holding Co of China Railway Siyuan Survey and Design Group Co Ltd
Priority date: 2020-02-20
Filing date: 2020-02-20
Publication date: 2020-05-22

Abstract

The invention is applicable to the technical field of geotechnical engineering and provides a foundation structure and a construction method. The above-mentioned foundation structure includes: the foundation body is arranged in a construction site; the bearing platform is arranged in the construction site and connected to the bottom of the foundation body; one end of the first supporting pile is inserted into a soil body perpendicular to the surface of a construction site, and the other opposite end of the first supporting pile is connected with a bearing platform; the second support piles are arranged at intervals, one ends of the second support piles and the surface of the construction site form included angles and are obliquely inserted into a soil body, and the opposite other ends of the second support piles are connected with the bearing platform; wherein, all be provided with the cavity in first support pile and the second support pile, still be provided with the whitewashing hole with the cavity intercommunication on first support pile and the second support pile respectively. In the invention, the first supporting piles and the second supporting piles form a tree root-shaped structure, so that the bearing capacity and the anti-overturning performance of the foundation structure are improved; and the slurry is injected into the soil body through the slurry spraying holes, so that the physical and mechanical properties of the soil body are improved, and the safety guarantee is provided for the structures.

Description

Foundation structure and construction method

Technical Field

The invention belongs to the technical field of geotechnical engineering, and particularly relates to a foundation structure and a construction method.

Background

The independent foundation and the strip foundation belong to a shallow foundation type, and the foundation of the type can be embedded in a stratum with good geological conditions, high physical and mechanical properties of foundation soil and large bearing capacity. When a foundation needs to be built on a soil body which is poor in physical and mechanical properties and large in soil layer thickness, the shallow foundation type cannot meet the use requirement.

Disclosure of Invention

In view of this, embodiments of the present invention provide a foundation structure and a construction method, so as to solve the problem of the need of building a foundation on a soil body with poor physical and mechanical properties and a thick soil layer.

In order to solve the above problems, the technical solution of the embodiment of the present invention is implemented as follows:

a base structure, comprising: the foundation body is arranged in a construction site and used for bearing a building to be built; the bearing platform is arranged in the construction site, connected to the bottom of the foundation body and used for bearing the foundation body; one end of the first supporting pile is perpendicular to the surface of the construction site and inserted into a soil body, and the other opposite end of the first supporting pile is connected with the bearing platform and used for supporting the bearing platform; the second support piles are arranged at intervals, one ends of the second support piles and the surface of the construction site form included angles and are obliquely inserted into a soil body, and the other opposite ends of the second support piles are connected with the bearing platform and used for supporting the bearing platform; wherein, first support stake with all be provided with in the second support stake and be used for the energy enough strengthen the bolt insert and hold the cavity that is used for forming the thick liquids of strengthening the stake after the bolt is extracted, first support stake with still be provided with respectively on the second support stake with the whitewashing hole of cavity intercommunication.

Preferably, the foundation body is an independent foundation, and the axis of the first supporting pile passes through the center of the bearing platform; each of the second support piles is arranged at intervals around the first support pile.

Preferably, the foundation body is a strip foundation, and a plurality of first supporting piles are arranged; the second supporting piles are respectively arranged at the corners of the bearing platform, and the first supporting piles are distributed on the side edges of the bearing platform.

Preferably, first support stake with the second support stake all includes the tubular pile, the cavity is formed the inside of tubular pile, and follow the length direction of tubular pile extends.

Preferably, the tubular pile includes the pile body and follows the length direction of pile body sets up the inside straight muscle of pile body, straight muscle interval is provided with a plurality ofly, each link to each other through the stirrup between the straight muscle.

The embodiment of the invention also provides a construction method, which is used for the construction of the foundation structure and comprises the following steps: prefabricating the first supporting pile and the second supporting pile, and prefabricating the first supporting pile and the second supporting pile with cavities according to design requirements; the arrangement of the first supporting piles and the second supporting piles is that the first supporting piles and the second supporting piles are pressed into a soil body one by one according to an arrangement rule in the construction site and are respectively grouted to form the reinforcing piles; grouting, namely grouting slurry into the cavities in the first supporting piles and the second supporting piles respectively; constructing the foundation body and the bearing platform, and simultaneously constructing and forming the foundation body and the bearing platform in the construction site according to the arrangement rule; the constructed foundation body is connected above the bearing platform, and the bearing platform is connected with the first supporting piles and the second supporting piles.

Preferably, the prefabrication construction of the first and second support piles comprises: manufacturing the first supporting pile and the second supporting pile, wherein cavities are formed in the first supporting pile and the second supporting pile according to design requirements, forming pointed ends on the ends of the first supporting pile and the second supporting pile, and meanwhile, arranging a plurality of guniting holes communicated with the cavities on the pile bodies of the first supporting pile and the second supporting pile and the pointed ends.

Preferably, the arrangement construction of each of the first support piles and each of the second support piles includes: firstly, determining the pressing-in sequence of the first supporting piles and the second supporting piles, then inserting bolts into cavities of the first supporting piles or the second supporting piles to be pressed in, and then respectively pressing each first supporting pile and each second supporting pile into a soil body in the construction site according to the arrangement rule; the first supporting piles and the second supporting piles can be accurately arranged.

Preferably, the grouting step comprises: injecting slurry into the cavities of the first supporting piles and the second supporting piles according to a grouting sequence, pressurizing to enable the slurry to be sprayed into a soil body through the slurry spraying holes, and injecting the slurry into the cavities to fill the cavities after pressurized grouting is completed so as to form reinforcing piles; and performing circulating grouting operation in such a way to finish grouting of each first supporting pile and each second supporting pile.

Preferably, the construction of the foundation body comprises: and after grouting is finished, constructing the bearing platform and the foundation body simultaneously by using concrete according to an arrangement rule in the field, and simultaneously ensuring that each first supporting pile and each second supporting pile are connected with the bearing platform.

The foundation structure provided by the embodiment of the invention comprises a foundation body, a bearing platform, a first supporting pile and a second supporting pile, wherein the foundation body is arranged on the bearing platform, the bearing platform provides support for the foundation body, and the first supporting pile and the second supporting pile are connected with the bearing platform and used for providing support for the bearing platform. One end of the first supporting pile is vertically inserted into a soil body by adopting, one end of the second supporting pile and the surface of a construction site form an included angle, the first supporting pile and the second supporting pile are obliquely inserted into the soil body, cavities for containing slurry for forming the reinforcing piles are arranged on the first supporting pile and the second supporting pile, and meanwhile, slurry spraying holes communicated with the cavities are arranged on the first supporting pile and the second supporting pile respectively. Therefore, the first support piles and the second support piles form a tree root-shaped structure, and the bearing capacity and the anti-overturning performance of the foundation structure are improved; and the slurry is injected into the soil body through the slurry spraying holes, so that gaps among soil particles are filled, the physical and mechanical properties of the soil body are improved, the settlement deformation is reduced, and the safety guarantee is provided for the normal use of the structures on the foundation structure of the building.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.

FIG. 1 is a front view of an infrastructure provided by an embodiment of the invention;

FIG. 2 is a top view of a base structure provided by an embodiment of the present invention;

FIG. 3 is a top view of another base structure provided by embodiments of the present invention;

FIG. 4 is a top view of a tube pile provided by an embodiment of the present invention;

FIG. 5 is a schematic structural diagram of a tubular pile provided by an embodiment of the present invention;

fig. 6 is a schematic flow chart of a construction method of a foundation structure according to an embodiment of the present invention.

Description of reference numerals:

1. a base structure; 11. a base body; 12. a bearing platform; 13. a first support pile; 14. a second support pile; 15. a cavity; 16. a guniting hole; 17. a tubular pile; 171. a pile body; 172. straightening ribs; 173. hooping; 174. a grouting port; 175. a tip.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is described in further detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

The individual features described in the embodiments can be combined in any suitable manner without departing from the scope, for example different embodiments and aspects can be formed by combining different features. In order to avoid unnecessary repetition, various possible combinations of the specific features of the invention will not be described further.

As shown in fig. 1, a foundation structure 1 provided in the embodiment of the present invention is mainly used in engineering projects with large surface soil thickness, poor physical and mechanical properties of soil bodies, and low natural bearing capacity. The construction of structures in this type of construction site often has the disadvantage of long construction times or high construction costs. Therefore, in order to satisfy the requirements of building the structure in the construction site of the type and simultaneously achieving the settlement deformation of the structure, the foundation structure 1 is arranged to improve the foundation soil, improve the bearing capacity, reduce the settlement deformation and provide safety guarantee for the normal use of the structure.

As shown in fig. 1 and 2, the foundation structure 1 includes a foundation body 11, a cap 12, a first support pile 13, and a second support pile 14. The foundation body 11 is generally constructed of reinforced concrete, and has a strong structural strength. The foundation body 11 is provided in a construction site for carrying a structure to be built, i.e., the structure to be built is built on the foundation body 11, and support is provided by the foundation body 11. The bearing platform 12 is also arranged in the construction site, the bearing platform 12 is usually constructed by reinforced concrete, has a large contact area with the soil body and has reliable anti-settling performance, so that the bearing platform 12 is connected to the bottom of the foundation body 11 and is used for bearing the foundation body 11 and providing support for the foundation body 11. In order to support the bearing platform 12, one end of the first supporting pile 13 is inserted into the soil body perpendicular to the surface of the construction site, and the other opposite end is connected with the bearing platform 12; meanwhile, a plurality of second supporting piles 14 are arranged at intervals, one end of each second supporting pile 14 and the surface of the construction site are obliquely inserted into the soil body at an included angle, and the other opposite end is connected with the bearing platform 12. In this way, the first supporting piles 13 and the second supporting piles 14 are arranged to simultaneously provide support for the bearing platform 12, the first supporting piles 13 and the second supporting piles 14 are inserted into the soil body in different modes, the first supporting piles 13 are vertically inserted, the second supporting piles 14 are obliquely inserted, the combined supporting pile structure is similar to a tree root shape, the supporting stability is good, the settlement can be reduced, and the reliability of the supporting bearing platform 12 is improved. In order to further improve the deformation resistance of the entire foundation structure 1 and reduce the deformation and settlement, in the embodiment of the present invention, cavities 15 for inserting pins capable of enhancing the structural strength and accommodating slurry for forming the reinforcing piles after the pins are extracted are provided in both the first supporting pile 13 and the second supporting pile 14, and slurry injection holes 16 (see fig. 5) communicating with the cavities 15 are further provided in each of the first supporting pile 13 and the second supporting pile 14. Thus, during actual construction, according to construction requirements, the first support pile 13 and the second support pile 14 are correspondingly inserted into a soil body of a construction site through pile pressing equipment, and when the first support pile 13 or the second support pile 14 is pressed into the soil body, a plug is inserted into the cavity 15 of the first support pile 13 or the second support pile 14, and the arrangement of the plug can enhance the integral rigidity of the support pile when the corresponding support pile is inserted into the soil body, so that the corresponding support pile can be smoothly pressed into the soil body, and the plug can plug the reserved grout spraying hole 16 on the support pile, so that soil particles are prevented from entering the cavity 15 along the reserved grout spraying hole 16 to plug the cavity 15 in the process of inserting the support pile into the soil body. After the corresponding support pile is pressed into the soil to a certain depth, the plug can be pulled out of the cavity 15. And reserve the shotcrete hole 16 that sets up on first support pile 13 and second support pile 14, can be after the pile pressing is accomplished, through the pressurization injection thick liquids into cavity 15, make the thick liquids spout by shotcrete hole 16 and pour into the soil body of corresponding position into, filled the space between the soil granule, make thick liquids and soil granule cemented and form unified whole, just can improve the physical and mechanical properties of the soil body, form a layer crust layer in the soil body around the support pile, promoted the end resistance, play and reduce the effect of subsiding the deformation. After the pressurized grouting is completed, the cavity 15 can be filled with slurry to form a reinforcing pile, so that the structural strength of the first supporting pile 13 and the second supporting pile 14 can be further enhanced, and the reliability of the supporting platform 12 can be improved.

In one possible embodiment, as shown in fig. 2, when the foundation body 11 is an independent foundation, it is adopted that the axis of the first support pile 13 passes through the center of the bearing platform 12, while a plurality of second support piles 14 are spaced around the first support pile 13. In particular, independent foundations are generally referred to as support foundations that are individually set, generally seated at only one cross axis intersection, and used for single-column or high-rise structures. When the foundation body 11 is configured as an independent foundation, the foundation body 11 is generally stacked on the supporting platform 12 in a symmetrical manner, so that by disposing the axis of the first supporting pile 13 through the center of the supporting platform 12, the first supporting pile 13 is also located at the center of the foundation body 11 to provide support for the foundation body 11, and the second supporting piles 14 are equally distributed around the circumference of the first supporting pile 13, and the distance between the second supporting piles 14 is set to be 0.5m to 1 m. In this way, the first supporting piles 13 and the second supporting piles 14 jointly form a tree root-shaped structure, so that the bearing capacity and the anti-overturning performance of the tree root-shaped structure can be improved, and further, the safety use of the structures arranged on the foundation body 11 is guaranteed.

In another possible embodiment, as shown in fig. 3, when the foundation body 11 is a strip-shaped foundation, a plurality of first supporting piles 13 and a plurality of second supporting piles 14 are respectively arranged, and the second supporting piles 14 are respectively arranged at the corners of the supporting platform 12, and the first supporting piles 13 are distributed on the sides of the supporting platform 12. In particular, a strip foundation generally refers to a form of foundation having a length much greater than a width, disposed on one axis and intersecting more than two axes. The strip foundations are generally frame structures. Therefore, it is adopted that the second supporting piles 14 are respectively arranged at each corner of the strip foundation, the first supporting piles 13 are distributed on each side of the bearing platform 12, and the intervals between the supporting piles on the same side (all the first supporting piles 13 and the second supporting piles 14 on the same side of the bearing platform 12) are equal, and the interval between the supporting piles is preferably set to be 1m to 3 m. With the arrangement, the first supporting piles 13 and the second supporting piles 14 are uniformly distributed at the bottom of the foundation body 11, and the first supporting piles 13 and the second supporting piles 14 are arranged in the soil body in the form of tree-root-shaped structures, so that the bearing capacity and the anti-overturning performance are strong, and stable and reliable support can be provided for the foundation body 11.

As shown in fig. 1, in the embodiment of the present invention, the second support piles 14 are arranged in a radial shape along the insertion direction. Specifically, each second support pile 14 is pressed into the soil body at an inclination angle of 15 to 30 degrees with respect to the vertical direction, so that, along the direction in which each second support pile 14 is pressed, the distance between each second support pile 14 and the vertically pressed first support pile 13 is gradually increased and is gradually diffused into a radial shape to form a structure similar to a root pile, and the other ends of the second support piles are connected with the bearing platform 12 to bear the load on the upper part of the bearing platform 12 together.

As shown in fig. 1 and 4, the first support pile 13 and the second support pile 14 each include a pipe pile 17, and the cavity 15 is formed inside the pipe pile 17 and extends in the length direction of the pipe pile 17. Specifically, the dimension of the tubular pile 17 is designed according to the design requirement so as to meet the use requirement. In the embodiment of the present invention, the length of the pipe pile 17 is 2m to 3m, the cavity 15 disposed inside the pipe pile 17 extends along the length direction of the pipe pile 17, and one end of the pipe pile 17 connected to the platform 12 is provided with a grouting port 174 for grouting into the cavity 15 through the grouting port 174. The end of the pipe pile 17 inserted into the soil body is of a closed structure, and the cavity 15 extends to the end position of the end as far as possible on the premise of ensuring the structural strength. Thus, when the guniting hole 16 is arranged on the pile pipe, the guniting hole 16 can be close to the end head of the end as far as possible, so that slurry can be injected into the surrounding soil body at the end head of the pipe pile 17, the physical and mechanical properties of the surrounding soil body at the end head are improved, and the resistance of the end head is improved.

As shown in fig. 4 and 5, in the embodiment of the present invention, the tubular pile 17 includes a pile body 171 and a plurality of straight ribs 172 arranged inside the pile body 171 along the length direction of the pile body 171, the straight ribs 172 are arranged at intervals, and the straight ribs 172 are connected by stirrups 173. Specifically, the pile body 171 is cast of concrete, and the straight ribs 172 and the stirrups 173 are both conventional steel materials, and both the grade specification and the dimension specification need to meet the design specification. The straight ribs 172 are arranged at equal intervals in accordance with the shape distribution of the pile 171. The stirrup 173 is bent according to the shape of the pile 171, and the formed stirrup 173 is connected to each straight rib 172. And a plurality of stirrups 173 are arranged at intervals in the length direction perpendicular to the straight ribs 172 to improve the firmness of the connection. Each straight rib 172 and each stirrup 173 are connected to each other to form a reinforcement cage structure, and are provided inside the pile 171 when the pile 171 is formed by concrete casting, thereby functioning to reinforce the structural strength of the pile 171.

As shown in fig. 4, it is preferable that a plurality of the spouting holes 16 are provided, and the spouting holes 16 are uniformly distributed in the tubular pile 17. Thus, after the pipe pile 17 is pressed in place, concrete slurry can be injected from the grouting opening 174 on the pipe pile 17 at a preset pressure, and then flows into the cavity 15 of the pipe pile 17, and then is sprayed out from the slurry spraying hole 16 to fill the pores among the soil particles in the soil layer, so that the cohesion among the particles can be enhanced, the physical and mechanical properties of the soil body can be improved, and the bearing capacity and the anti-overturning capacity of the soil body can be improved. Specifically, in the actual setting, the grout holes 16 are uniformly distributed on the pipe pile 17, and it is ensured that the grout holes 16 are distributed in a quincunx shape after the pipe pile 17 is unfolded in the width direction.

As another implementation manner of the structure of the tubular pile 17, the tubular pile 17 may be formed by a metal pipe (such as a steel pipe) with structural strength meeting the use requirement, the metal pipe is internally provided with a cavity 15, and the side wall of the metal pipe is also provided with a plurality of grout spraying holes 16 communicated with the cavity 15. After the metal pipe is pressed into the soil body according to the construction requirement, the slurry can be pressurized and injected into the cavity 15 of the metal pipe, so that the slurry is sprayed out of each slurry spraying hole 16 and injected into the soil body, and after the pressurized grouting is finished, the cavity 15 is filled with the slurry to form the reinforcing pile, so that the structural strength of the tubular pile 17 can be enhanced.

In one possible embodiment, as shown in fig. 4, to improve the ease of driving the pipe pile 17 into the ground, a tip 175 is formed at the end of the pipe pile 17 for insertion into the ground. The tip 175 is preferably set to be conical, and through the tip 175, the stress area of the tubular pile 17 in the inserting process can be reduced, and meanwhile, a guiding effect can be provided for the insertion of the tubular pile 17, so that the smoothness of the tubular pile 17 pressed into the soil body is improved. After the tubular pile 17 is inserted into the soil body, the tubular pile 17 and the soil body jointly form a U-shaped pipe which can be communicated with the atmosphere, so that the slurry can be conveniently injected, the diffusion range of the slurry in the soil body is enlarged, the area of the soil body for improving the physical and mechanical properties of the soil body through the slurry is increased, and the support strength of the tubular pile 17 is favorably improved. Also, it is possible to provide the slurry injection holes 16 at the tip 175, and the slurry injection holes 16 are preferably uniformly distributed on the side wall of the tip 175. Therefore, grouting can be performed on the soil body corresponding to the tip 175, so that the soil body around the tip 175 is hardened, the end resistance of the tubular pile 17 is improved, and settlement is reduced. The tip 175 is also generally cast of concrete along with the pilings 171, and a reinforcement cage structure is also provided inside the tip 175 to reinforce the structural strength of the tip 175. The end point in the above is the limit position of the pipe pile 17 in the length direction.

As shown in FIG. 4, in the concrete arrangement, it is preferable that each of the spouting holes 16 is provided within a range of 1/2 to 2/3 of the length of the tubular pile 17 from the end where the tip 175 is located. In this way, by providing each of the grout injection holes 16 at an appropriate position on the pipe pile 17, the range in which grout is injected into the soil around the support pile can be increased by each of the grout injection holes 16, and the area in which the mechanical properties of the soil are improved can be increased as much as possible. Even when the pipe pile 17 is provided with a plurality of shotcrete holes 16, it can still have sufficient structural strength, and can be pressed into the soil in the construction site with a reliable pressure.

According to the foundation structure provided by the embodiment of the invention, the first supporting piles and the second supporting piles are inserted into the soil body together to form a tree root-shaped structure in a combined manner, so that the bearing capacity and the anti-overturning performance of the foundation structure are improved. And each first supporting pile and each second supporting pile are provided with a cavity and a plurality of grout spraying holes communicated with the cavity, so that the slurry can be injected into the cavity through the cavities, the slurry is sprayed into the soil body through the grout spraying holes, and gaps among soil body particles are filled, so that the physical and mechanical properties of the soil body are improved, and the sprayed slurry forms a hard shell layer in the soil body, thereby improving the end resistance and reducing the settlement deformation. Meanwhile, the cavity arranged on the supporting pile can enhance the integral rigidity of the supporting pile by inserting the bolt into the cavity when the supporting pile is pressed into a soil body, so that the corresponding supporting pile can be smoothly pressed into the soil body, the bolt can also plug the reserved slurry spraying hole on the supporting pile, and soil particles are prevented from entering the cavity along the reserved slurry spraying hole in the process of inserting the supporting pile into the soil body, so that the cavity is blocked, and the design ingeniousness is good.

As shown in fig. 6, the embodiment of the present invention further provides a construction method for constructing the foundation structure 1, the construction method includes prefabrication of the first support piles 13 and the second support piles 14, arrangement of the first support piles 13 and the second support piles 14, and building of the foundation body 11 and the bearing platform 12. Specifically, the prefabrication steps of the first support pile 13 and the second support pile 14 are as follows: the first supporting pile 13 and the second supporting pile 14 with the cavity 15 are prefabricated according to design requirements, and the number, the size, the shape and the like of the prefabricated first supporting pile 13 and the prefabricated second supporting pile 14 need to meet construction requirements. The arrangement steps of each first support pile 13 and each second support pile 14 are as follows: and in a construction site, pressing the first support piles 13 and the second support piles 14 into the soil body one by one according to an arrangement rule, so that the positions of the first support piles 13 and the second support piles 14 pressed into the soil body meet the construction setting requirement. The grouting step is as follows: after the arrangement of each first support pile 13 and each second support pile 14 is completed, slurry is injected into the cavity 15 in each first support pile 13 and each second support pile 14 respectively, so that the slurry can be injected into the soil body and the cavity 15 in each support pile can be filled to form a reinforced pile. The building steps of the foundation body 11 and the bearing platform 12 are as follows: simultaneously constructing and forming a foundation body 11 and a bearing platform 12 in a construction site according to an arrangement rule; and the constructed foundation body 11 is connected above the bearing platform 12, and the bearing platform 12 is kept connected with each first supporting pile 13 and each second supporting pile 14. In this construction, the root-shaped support structure formed by the first support piles 13 and the second support piles 14 is distributed at the bottom of the bearing platform 12, and the foundation body 11 is supported by supporting the bearing platform 12, and further, the structure built on the foundation body 11 is supported. Furthermore, it is achieved that grout can be injected into the soil and that reinforcing piles are formed in the cavities 15 of the support piles. Therefore, the slurry is injected into the soil body to improve the physical and mechanical properties of the soil, a hard shell layer can be formed in the soil body, the side resistance and the end resistance are improved, the formed reinforcing pile can enhance the supporting strength of the supporting pile, the supporting stability of the supporting pile is improved, and the settlement deformation is reduced.

Specifically, the prefabrication construction of the first support pile 13 and the second support pile 14 includes: the first support pile 13 and the second support pile 14, each having the cavity 15 formed therein, are fabricated according to design requirements, and the tip 175 is formed on the ends of the first support pile 13 and the second support pile 14, and at the same time, a plurality of guniting holes 16 communicating with the cavity 15 are formed on the pile body 171 and the tip 175 of the first support pile 13 and the second support pile 14. When prefabrication of the first support pile 13 and the second support pile 14 is performed, the length size and shape of each support pile formed should meet the design requirements, and the shape and size of the tip 175 formed on each support pile should also meet the design requirements. The positions, the number and the distribution of the guniting holes 16 formed in the tip 175 and the pile body 171 are required to meet the design requirements, and it is ensured that the prefabricated first support piles 13 and the prefabricated second support piles 14 can meet the construction and use requirements.

Specifically, the arrangement construction of each first support pile 13 and each second support pile 14 includes: firstly, determining the pressing-in sequence of the first supporting pile 13 and the second supporting pile 14, then inserting a bolt into a cavity 15 of the first supporting pile 13 or the second supporting pile 14 to be pressed in, and then pressing each first supporting pile 13 and each second supporting pile 14 into a soil body in the construction site according to the arrangement rule; enabling the accurate arrangement of each first support pile 13 and each second support pile 14. Specifically, when the foundation body 11 to be set is an independent foundation, the shape of the independent foundation to be set is adopted, the second support piles 14 are pressed into the soil body at an inclination angle of 15-30 degrees relative to the vertical direction around the periphery of the shape of the independent foundation, the first support piles 13 are vertically pressed into the soil body at the central position of the independent foundation, and the distance between the arranged support piles is 0.5-1 m. When the foundation body 11 to be installed is a strip foundation, the second supporting piles 14 are respectively installed at the corners of the supporting platform 12, and then the first supporting piles 13 are distributed on the sides of the supporting platform 12, and the distance between the supporting piles (all the first supporting piles 13 and the second supporting piles 14 on the same side of the supporting platform 12) on the same side is preferably 1m to 3 m. By the arrangement mode, the supporting piles form tree root-shaped structures, the bearing capacity is improved, the deformation of the foundation body 11 can be reduced, and the safety of the structure is guaranteed.

Specifically, the grouting step includes: according to the grouting sequence, slurry is injected into the cavities 15 of the first supporting piles 13 and the second supporting piles 14, the slurry is pressurized to be sprayed into the soil body through the slurry spraying holes 16, gaps among the soil particles are filled with the slurry, and the slurry and the soil particles are cemented to form a unified whole, so that the physical and mechanical properties of the soil body can be improved. After the pressurized grouting is completed, the cavity 15 is filled with the slurry to form the reinforcing pile, so that the structural strength of the supporting pile can be enhanced. In the concrete grouting process, grouting is firstly carried out on the supporting pile positioned in the middle, during grouting, the bolt in the supporting pile is firstly pulled out, then the slurry is injected from the grouting opening 174 on the supporting pile, and predetermined pressure is applied, so that the slurry is jetted from the slurry jetting hole 16 and is injected into the soil body, when the predetermined pressure is exceeded, pressurized grouting is stopped, then the cavity 15 of the supporting pile is filled with the slurry, and thus, the grouting operation is circulated, and the grouting construction of each first supporting pile 13 and each second supporting pile 14 in the construction site is completed.

Specifically, the construction of the foundation body 11 includes: after grouting is completed, concrete is used for building simultaneously to form the bearing platform 12 and the foundation body 11 according to arrangement rules in the field, and the shapes of the bearing platform 12 and the foundation body 11 formed by building the concrete need to meet design requirements, such as forming an independent foundation or a strip foundation, so as to meet the use requirement of building a structure on the foundation body 11. Meanwhile, it is necessary to ensure that each first support pile 13 and each second support pile 14 are connected to the bearing platform 12, so as to provide a supporting force at the bottom of the bearing platform 12, jointly bear an upper load, and provide a guarantee for the safe use of the structure.

The foundation structure formed by the construction method has short construction time period and low construction cost, realizes the use requirement of the construction of the structures on the soil bodies with different thicknesses, improves the physical and mechanical properties of the soil bodies, further enhances the bearing capacity and the anti-overturning property of the soil bodies, can reliably bear loads and ensures the safe use of the constructed structures.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims

1. An infrastructure, comprising:

the foundation body is arranged in a construction site and used for bearing a building to be built;

the bearing platform is arranged in the construction site, connected to the bottom of the foundation body and used for bearing the foundation body;

one end of the first supporting pile is perpendicular to the surface of the construction site and inserted into a soil body, and the other opposite end of the first supporting pile is connected with the bearing platform and used for supporting the bearing platform;

the second support piles are arranged at intervals, one ends of the second support piles and the surface of the construction site form included angles and are obliquely inserted into a soil body, and the other opposite ends of the second support piles are connected with the bearing platform and used for supporting the bearing platform;

wherein, first support stake with all be provided with in the second support stake and be used for the energy enough strengthen the bolt insert and hold the cavity that is used for forming the thick liquids of strengthening the stake after the bolt is extracted, first support stake with still be provided with respectively on the second support stake with the whitewashing hole of cavity intercommunication.

2. The foundation structure of claim 1 wherein said foundation body is a free-standing foundation, said first support pile having an axis passing through the center of said cap; each of the second support piles is arranged at intervals around the first support pile.

3. The foundation structure as claimed in claim 1, wherein said foundation body is a bar-shaped foundation, and said first supporting piles are provided in plurality; the second supporting piles are respectively arranged at the corners of the bearing platform, and the first supporting piles are distributed on the side edges of the bearing platform.

4. The substructure of any of claims 1 to 3, wherein said first support pile and said second support pile each comprise a tube pile, said cavity being formed inside said tube pile and extending in the direction of the length of said tube pile.

5. The foundation structure of claim 4, wherein the tubular pile comprises a pile body and a plurality of straight ribs arranged inside the pile body along the length direction of the pile body, and the straight ribs are arranged at intervals and connected with each other through stirrups.

6. A construction method for the construction of a foundation structure according to any one of claims 1 to 5, characterized in that it comprises:

prefabricating the first supporting pile and the second supporting pile, and prefabricating the first supporting pile and the second supporting pile with cavities according to design requirements;

the arrangement of the first supporting piles and the second supporting piles is that the first supporting piles and the second supporting piles are pressed into a soil body one by one according to an arrangement rule in the construction site and are respectively grouted to form the reinforcing piles;

grouting, namely grouting slurry into the cavities in the first supporting piles and the second supporting piles respectively;

constructing the foundation body and the bearing platform, and simultaneously constructing and forming the foundation body and the bearing platform in the construction site according to the arrangement rule;

the constructed foundation body is connected above the bearing platform, and the bearing platform is connected with the first supporting piles and the second supporting piles.

7. The construction method according to claim 6, wherein the prefabrication construction of the first and second support piles comprises:

manufacturing the first supporting pile and the second supporting pile, wherein cavities are formed in the first supporting pile and the second supporting pile according to design requirements, forming pointed ends on the ends of the first supporting pile and the second supporting pile, and meanwhile, arranging a plurality of guniting holes communicated with the cavities on the pile bodies of the first supporting pile and the second supporting pile and the pointed ends.

8. The construction method according to claim 6, wherein the arrangement construction of each of the first support piles and each of the second support piles comprises:

firstly, determining the pressing-in sequence of the first supporting piles and the second supporting piles, then inserting bolts into cavities of the first supporting piles or the second supporting piles to be pressed in, and then respectively pressing each first supporting pile and each second supporting pile into a soil body in the construction site according to the arrangement rule; the first supporting piles and the second supporting piles can be accurately arranged.

9. The construction method according to claim 6, wherein the grouting step comprises:

injecting slurry into the cavities of the first supporting piles and the second supporting piles according to a grouting sequence, pressurizing to enable the slurry to be sprayed into a soil body through the slurry spraying holes, and injecting the slurry into the cavities to fill the cavities after pressurized grouting is completed so as to form reinforcing piles; and performing circulating grouting operation in such a way to finish grouting of each first supporting pile and each second supporting pile.

10. The construction method according to claim 7, wherein the construction of the foundation body comprises:

and after grouting is finished, constructing the bearing platform and the foundation body simultaneously by using concrete according to an arrangement rule in the field, and simultaneously ensuring that each first supporting pile and each second supporting pile are connected with the bearing platform.