Production method and construction method of prefabricated high-strength toughness composite precast column pile

Abstract

The application discloses a production method and a construction method of an assembled high-strength toughness composite precast stand column, and belongs to the technical field of foundation pit support.The stand column production method and the construction method of the application mainly comprise a foundation pile section, a bottom plate section, a stand column section and a support section, the foundation pile section, the bottom plate section, the stand column section and the support section of the stand column are produced through a prefabrication production method, the efficient construction of the stand column can be realized through the on-site assembly process of the pile sections, the strength and toughness of the pile sections are combined to enhance the design, the stand column can be constructed by using a static pressure process, the construction efficiency is significantly improved, and the construction process is simpler; meanwhile, the foundation pile section and the stand column section are assembled and connected through the bottom plate section, the stand column sections are assembled and connected through the support section, the connection strength is higher, the on-site operation is convenient, and due to the improvement of the strength and toughness of the stand column, the brittle failure of the stand column in the construction process is avoided, and the stand column section of the stand column is 100% recycled.

Description

TECHNICAL FIELD

[0001] The present application relates to a column pile for deep foundation pit support and its production and construction method, more particularly to a production method and construction method of a fabricated high-strength toughness composite prefabricated column pile. BACKGROUND

[0002] With the acceleration of urbanization and the deepening of underground space development, deep foundation pit engineering plays a crucial role in high-rise buildings, subway tunnels, underground comprehensive pipe galleries and other projects. At the same time, deep foundation pit engineering also faces multiple challenges such as complex stratum adaptation, green construction and intelligent construction. As a key vertical load-bearing component in the foundation pit support system, the performance of the column pile directly determines the stability of the foundation pit, the construction efficiency and the impact on the surrounding environment. However, the traditional column pile technology has many problems in practical application, and it is urgent to achieve breakthroughs through technological innovation to meet the needs of modern engineering construction for high efficiency, environmental protection, economy and sustainable development.

[0003] Traditional column pile technology mainly includes cast-in-place pile, steel pipe pile, stiff composite pile and prefabricated pile, etc. These column piles have many limitations in construction technology, such as:

[0004] Cast-in-place pile is a common form of column pile, which is formed by drilling on site and pouring concrete. Although its bearing capacity is high, the construction period is long, it is greatly affected by geological conditions, and problems such as hole collapse and shrinkage are prone to occur. In addition, a large amount of mud is produced during the construction process of cast-in-place pile, causing environmental pollution, and the pile body cannot be recycled, which does not meet the concept of green construction.

[0005] Steel pipe pile has the advantages of fast construction speed, high bearing capacity and strong anti-deformation ability, but its cost is relatively high and its anti-pulling performance is relatively poor. In the recycling process, steel pipe pile usually needs to be cut, resulting in serious material waste and difficulty in meeting the requirements of sustainable development.

[0006] Stiff composite pile enhances the strength of the pile body by inserting a steel pipe or steel lattice column inside the pile body, but the core problem is the insufficient reliability of the connection between the prefabricated pile and the steel structure. The construction process is complex, the strength and durability of the connection node are difficult to guarantee, and brittle failure is prone to occur under complex geological conditions.

[0007] Prefabricated piles such as prestressed concrete square piles have gradually attracted attention due to their advantages of factory production, fast construction speed and controllable quality. However, the traditional prefabricated pile lacks toughness and is prone to brittle failure under complex geological conditions. In addition, the mechanical connector design between pile segments has a risk of stress concentration, affecting its long-term stability.

[0008] In recent years, although some progress has been made in column pile technology, there are still many unsolved problems, such as:

[0009] High strength and high toughness requirements: In complex geological conditions, the column pile needs to have compression resistance, bending resistance and impact resistance to avoid brittle failure. However, in the prior art, it is difficult to balance high strength and high toughness of the column pile, especially in deep foundation pits and complex geological environments, traditional materials and structural forms have been difficult to meet the engineering requirements.

[0010] Recyclability and economy: Most traditional column piles cannot be recycled, not only causing material waste, but also increasing engineering cost. Although some recyclable technologies have made some progress, their recycling process is complex, difficult to operate, and not highly adaptable, making it difficult to be widely used in actual engineering.

[0011] Optimization of connection nodes: The foundation section of the column pile usually uses cast-in-place piles or pipe piles, and the insufficient strength of the connection nodes has always been a key problem restricting the performance improvement of the column pile. In the prior art, the connection between pile sections mostly uses mechanical connectors, which has the risk of stress concentration, affecting the long-term stability of the column pile.

[0012] Intelligent construction and monitoring: Although the application of intelligent monitoring technology in column piles has gradually increased, the system integration cost is high, and the reuse and maintenance cost of sensors cannot be ignored. In addition, in the prior art, the integration degree of intelligent construction and monitoring system is low, and it is difficult to realize full automation and intelligent control of the construction process.

[0013] In summary, the traditional column pile technology has many problems in construction period, material recyclability, connection stiffness, environmental impact and intelligent construction, and although the existing improved technology has made some progress, it still cannot fully meet the needs of modern engineering construction for high efficiency, environmental protection, economy and sustainable development. Therefore, developing a fabricated column pile technology with high strength, high toughness, recyclability, reliable connection and intelligent construction has become a technical problem to be solved, and is also a key direction to promote the technological progress in the field of foundation pit support engineering. SUMMARY

[0014] 1. Technical problems to be solved by the invention

[0015] The purpose of the present application is to overcome the deficiencies of the existing column pile technology, such as long construction period, poor recyclability, low connection strength, and poor pile body strength and toughness, and to provide a production method and a construction method for a fabricated high-strength and toughness composite prefabricated column pile. By using the technical scheme of the present application, the base pile section, the bottom plate section, the column section and the support section of the column pile are made by a prefabrication production method, and the efficient construction of the column pile can be realized by the on-site assembly process of each pile section. Combined with the strength and toughness enhancement design of each pile section, the column pile can be constructed by static pressure process, the construction efficiency is significantly improved, and the construction process is simpler. At the same time, the base pile section and the column section are assembled and connected through the bottom plate section, and the column sections are assembled and connected through the support section, so that the connection strength is higher, the on-site operation is convenient, and due to the improvement of the strength and toughness of the column pile, brittle failure of the column pile in the construction process is avoided, and 100% recycling of the column section of the column pile is realized.

[0016] 2. Technical scheme

[0017] To achieve the above purpose, the technical scheme provided by the present application is:

[0018] The production method of the fabricated high-strength and toughness composite prefabricated column pile comprises the following steps:

[0019] S1, column pile design: according to the engineering drawings and related data, a column pile design drawing is prepared; the column pile comprises a base pile section, a bottom plate section, a column section and a support section, wherein,

[0020] The base pile section is a prefabricated square pile, which comprises a reinforcement cage, a pile end steel plate welding member and square pile concrete;

[0021] The bottom plate section comprises a rectangular steel frame and a bottom plate section concrete filled in the rectangular steel frame, and a bottom plate section double-direction reinforcement connector for connecting with the reinforcement structure in the cast-in-place foundation pit bottom plate in two directions is pre-embedded in the bottom plate section;

[0022] The column section comprises an outer steel structure layer and an inner net structure located inside the outer steel structure layer, and the outer steel structure layer and the inner net structure are connected by high-strength concrete pouring to form an integral whole;

[0023] The support section comprises a support steel frame and a support section concrete filled in the support steel frame, and a support section double-direction reinforcement connector for connecting with the reinforcement structure in the cast-in-place support beam in two directions is pre-embedded in the support section;

[0024] S2, production of prefabricated parts: according to the column pile design drawing, each pile section component of the base pile section, the bottom plate section, the column section and the support section is made respectively;

[0025] S3, assembly: install each pile segment component into the corresponding mold, respectively pour concrete, and obtain the prefabricated foundation pile segment, bottom plate segment, column segment and support segment after curing.

[0026] Further, in step S2, the pile end steel plate welding piece of the foundation pile segment includes a pile end end plate, four pile end connecting angle steels respectively welded and fixed at four corners of the pile end end plate, and a pile end patch plate welded and fixed between adjacent pile end connecting angle steels; in step S3, each end of the steel reinforcement cage is provided with a group of pile end steel plate welding pieces, and the foundation pile segment is one of a prefabricated solid square pile, a prefabricated hollow square pile, a prestressed prefabricated solid square pile and a prestressed prefabricated hollow square pile.

[0027] Further, in step S2, the rectangular steel frame of the bottom plate segment includes a bottom end plate, bottom plate segment angle steels, a top end plate and a bottom plate segment patch plate, the bottom end plate and the top end plate are fixedly connected by four bottom plate segment angle steels, and the four bottom plate segment angle steels are sequentially connected by the bottom plate segment patch plates; the upper and lower ends of the four bottom plate segment angle steels are also respectively provided with bottom plate segment connecting plates for connecting the foundation pile segment and the column segment; the inner side of the rectangular steel frame is also pre-buried with an inner side water stop plate, and the outer side of the bottom plate segment angle steel is also secondarily welded with an outer side water stop plate and a plurality of studs after the foundation pit is excavated.

[0028] Further, in step S2, the inner side net rack structure includes an inner layer fiber net rack, a steel reinforcement net rack and an outer layer fiber net rack, the steel reinforcement net rack is connected by main reinforcement and stirrup, and the inner layer fiber net rack and the outer layer fiber net rack are both made of FRP high-strength fiber grid; in step S3, the outer layer fiber net rack is located on the outer side of the steel reinforcement net rack, and the inner layer fiber net rack is located on the inner side of the steel reinforcement net rack.

[0029] Further, in step S2, the outer side steel structure layer includes a bottom end cover plate, column segment angle steels, a top end cover plate, a bottom end patch plate, a top end patch plate and middle patch plates, the bottom end cover plate and the top end cover plate are connected into a rectangular frame structure by four column segment angle steels, the lower ends of the four column segment angle steels are sequentially connected by the bottom end patch plates, the upper ends are sequentially connected by the top end patch plates, and a plurality of middle patch plates are sequentially arranged between the four column segment angle steels from top to bottom; in step S3, polypropylene fiber reinforced material is added in the high-strength concrete.

[0030] Further, in step S3, the column segment is further provided with a foundation pit section monitoring sensor and a wireless communication module, and the foundation pit section monitoring sensor is in communication connection with a background monitoring system through the wireless communication module.

[0031] Further, in step S2, the supporting steel frame is further provided with a pneumatic fragmentation device, the pneumatic fragmentation device is provided with an outer guide pipe and a cover detachably mounted at the end of the outer guide pipe, the outer guide pipe is provided with a liquid carbon dioxide filling channel, a positive electrode connecting pipe and a negative electrode connecting pipe respectively; in step S3, the outer guide pipe is guided out from one side of the supporting section concrete.

[0032] Further, in step S2, the supporting steel frame comprises a lower end plate, supporting section angle steels, an upper end plate and supporting section plates, the lower end plate and the upper end plate are fixedly connected through four supporting section angle steels, the four supporting section angle steels are sequentially connected through supporting section plates, and the upper and lower ends of the four supporting section angle steels are further respectively provided with supporting section connecting plates for connecting column sections.

[0033] The column pile construction method of the prefabricated high-strength toughness composite prefabricated column pile prepared by the production method comprises the following steps:

[0034] S1, equipment debugging: according to the column pile construction position, a static pressure pile machine is installed, and the static pressure pile machine is debugged to ensure that the hydraulic system, electrical system and walking system of the static pressure pile machine normally operate; a pile feeder is installed on the static pressure pile machine, and the pile feeder is debugged to ensure that the pile feeder can smoothly press the column pile into the design elevation; after the pile feeder debugging is completed, the pile feeder is removed;

[0035] S2, foundation pile section construction: using the static pressure pile machine to press the foundation pile section into the design elevation, the pile pressing speed is controlled at 0.5-1.0 m / min, and the verticality deviation of the foundation pile section is controlled within 0.5%;

[0036] S3, sectional connection and pile pressing: first, the column section is connected through the bottom plate section on the top of the foundation pile section, and the first column section is pressed into the design elevation by using the static pressure pile machine; then the remaining column sections are connected through the supporting sections in sequence, and the column sections are pressed into the design elevation by using the static pressure pile machine; the pile pressing speed of the column section is controlled at 0.5-1.0 m / min;

[0037] S4, pile feeding of the pile feeder: the pile feeder is installed on the static pressure pile machine and connected with the last column section, and the last column section is pressed into the design elevation by using the pile feeder and the static pressure pile machine, at this time, the foundation pile section is located in the foundation pit bottom stratum, and the column section is located in the foundation pit;

[0038] S5, connection of the foundation pit supporting beam: after the column pile pressing is completed, the foundation pit soil is excavated, and the supporting beam is connected with the corresponding supporting section layer by layer from top to bottom to support the foundation pit;

[0039] S6, foundation pit bottom plate construction: after the soil is excavated to the foundation pit bottom, the foundation pit bottom plate construction is started, and the foundation pit bottom plate is connected with the bottom plate section; then the main structure in the foundation pit is constructed layer by layer from bottom to top.

[0040] Further, after the main structure construction in the foundation pit is completed, a disassembly and recovery step S7 is entered; in the disassembly and recovery step S7, the column segment is first removed, and then the support segment and the support beam are removed; the recovered and repaired column segment is matched and designed according to the design requirements of the next project and is reused.

[0041] 3. Beneficial effects

[0042] Compared with the prior art, the technical scheme provided by the present application has the following remarkable effects:

[0043] (1) The production method of the fabricated high-strength and ductile composite prefabricated column pile of the present application comprises steps of column pile design, prefabricated part production and assembly and fabrication, etc. The column pile is mainly composed of a foundation pile segment, a bottom plate segment, a column segment and a support segment. The foundation pile segment, the bottom plate segment, the column segment and the support segment are made by a prefabricated production method, and the high-efficiency construction of the column pile can be realized by the on-site assembly process of each pile segment. The bottom plate segment comprises a rectangular steel frame and a bottom plate segment concrete filled in the rectangular steel frame. The column segment comprises an outer steel structure layer and an inner net structure located inside the outer steel structure layer. The outer steel structure layer and the inner net structure are connected as a whole by high-strength concrete pouring. The support segment comprises a support steel frame and a support segment concrete filled in the support steel frame. The strength and ductility of each pile segment are enhanced to make the column pile be constructed by a static pressure process, significantly improve the construction efficiency and simplify the construction process. Meanwhile, the foundation pile segment and the column segment are assembled and connected through the bottom plate segment, and the column segments are assembled and connected through the support segments, so that the connection strength is higher, the on-site operation is convenient, and due to the improvement of the strength and ductility of the column pile, the brittle failure of the column pile in the construction process is avoided, and the column segment of the column pile is 100% recycled. In addition, the bottom plate segment is pre-buried with a bottom plate segment bidirectional steel bar connector for connecting the steel bar structure in the cast-in-place foundation pit bottom plate in two directions, and the support segment is pre-buried with a support segment bidirectional steel bar connector for connecting the steel bar structure in the cast-in-place support beam in two directions, so that the connection firmness between the foundation pit bottom plate and the column pile and between the foundation pit support beam and the column pile is improved, and the stability of the deep foundation pit support is ensured.

[0044] (2) The pile end steel plate welding piece of the foundation pile segment of the production method of the fabricated high-strength and ductile composite prefabricated column pile of the present application comprises a pile end end plate, a pile end connecting angle steel and a pile end plate, and compared with the existing prefabricated square pile, the pile end plate design is added to ensure the connection reliability of the foundation pile segment and the upper column segment.

[0045] (3) The production method of the assembled high-strength toughness composite prefabricated column pile of the application, the rectangular steel frame of the bottom plate section includes a bottom end plate, a bottom plate section angle steel, a top end plate and a bottom plate section patch plate, which ensures the structural strength of the bottom plate section; meanwhile, the inner side of the rectangular steel frame is also pre-buried with an inner side water stop plate, and the outer side of the bottom plate section angle steel is also secondarily welded with an outer side water stop plate and a plurality of studs after the foundation pit is excavated, which solves the water stopping problem of the column pile and the bottom plate and the connection reliability problem of the column pile and the bottom plate, and utilizes the foundation pile section to form effective support on the bottom plate.

[0046] (4) The production method of the assembled high-strength toughness composite prefabricated column pile of the application, the inner side net frame structure of the column section includes an inner layer fiber net frame, a steel bar net frame and an outer layer fiber net frame, the steel bar net frame is connected by main reinforcement and stirrup, the inner layer fiber net frame and the outer layer fiber net frame are both made of FRP high-strength fiber grid, the inner and outer layer fiber net frames and the steel bar net frame can further improve the strength and toughness of the column section, and the column section is composed of four structure layers from inside to outside, which can reduce the overall steel consumption, reduce the manufacturing cost under the condition of improving the structural strength, toughness and tensile strength of the column pile, and make the column pile have compression resistance, bending resistance and impact resistance.

[0047] (5) The production method of the assembled high-strength toughness composite prefabricated column pile of the application, the outer side steel structure layer of the column section includes a bottom end cover plate, a column section angle steel, a top end cover plate, a bottom end patch plate, a top end patch plate and a middle patch plate, compared with the traditional steel lattice column, the column section uses high-strength concrete to connect the outer side steel structure layer and the inner side net frame structure as a whole, so that the steel consumption of the outer side steel structure layer can be less, and the steel consumption cost of the column section is reduced; in addition, the high-strength concrete adds polypropylene fiber reinforced material, which can improve the crack resistance, impact resistance and toughness of the concrete, improve the service life of the column section, and meet the requirements of repeated recycling of the column section.

[0048] (6) The production method of the assembled high-strength toughness composite prefabricated column pile of the application, the column section further has a foundation pit section monitoring sensor and a wireless communication module, the foundation pit section monitoring sensor is in communication connection with a background monitoring system through the wireless communication module, which provides data support for intelligent construction and is beneficial to intelligent control of foundation pit deformation.

[0049] (7) The production method of the assembled high-strength toughness composite prefabricated column pile of the application, the support steel frame further has a pneumatic fragmentation device, which can effectively and conveniently break and remove the support section in the demolition stage, so that the support beam is simple and convenient to remove, and the steel structure of the support section can still be recycled for the second time.

[0050] (8) The construction method of the assembled high-strength toughness composite prefabricated column pile of the application comprises the steps of equipment debugging, foundation pile segment construction, segmented connection and pile pressing, pile feeder pile feeding, foundation pit support beam connection and foundation pit bottom plate construction, etc., and the foundation pile segment, the bottom plate segment and each column segment are segmented and pressed into the foundation pit by using a static pile press, and finally the column pile is pressed into the design elevation by cooperating with the pile feeder, the whole construction process is more simple and efficient, the construction noise is small, the pollution is less, and the construction depth is not limited in principle, which can be used for deep foundation pit support, and the application range is more extensive.

[0051] (9) The construction method of the assembled high-strength toughness composite prefabricated column pile of the application, after the main structure construction in the foundation pit is completed, enters the dismantling and recycling stage, and when the support segment is removed, the support segment can be broken and removed by using the pneumatic fragmentation device, which facilitates the rapid removal of the cast-in-place support beam, reduces the difficulty of dismantling, and improves the dismantling efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0052] Figure 1 The production method flow chart of the assembled high-strength toughness composite prefabricated column pile of the application;

[0053] Figure 2 The assembly structure diagram of the assembled high-strength toughness composite prefabricated column pile of the application;

[0054] Figure 3 The structure and pouring forming diagram of the foundation pile segment in the application;

[0055] Figure 4 The perspective structure diagram of the hollow foundation pile segment in the application;

[0056] Figure 5 The structure and pouring forming diagram of the bottom plate segment in the application;

[0057] Figure 6 The structure and pouring forming diagram of the column segment in the application;

[0058] Figure 7 The perspective structure diagram of the hollow column segment in the application;

[0059] Figure 8 The cross-sectional structure diagram of the hollow column segment in the application;

[0060] Figure 9 The structure and pouring forming diagram of the support segment in the application;

[0061] Figure 10 The outer guide pipe local enlarged structure diagram of the pneumatic fragmentation device in the application;

[0062] Figure 11It is the internal section structure schematic view of outer guide pipe of the pneumatic fragmentation device in the application.

[0063] Figure 12 It is a flow chart of the construction method of the fabricated high-strength toughness composite precast column pile.

[0064] The label in the schematic diagram is explained as follows:

[0065] 1, base pile section; 1-1, steel reinforcement cage; 1-2, pile end steel plate welding part; 1-2-1, pile end plate; 1-2-2, pile end connecting angle steel; 1-2-3, pile end cover plate; 1-3, square pile concrete;

[0066] 2, bottom plate section; 2-1, rectangular steel frame; 2-1-1, bottom end plate; 2-1-2, bottom plate section angle steel; 2-1-3, top end plate; 2-1-4, bottom plate section cover plate; 2-1-5, inner side water stop plate; 2-1-6, bottom plate section connecting plate; 2-2, bottom plate section bidirectional steel reinforcement adapter; 2-3, bottom plate section concrete; 2-4, outer side water stop plate; 2-5, stud;

[0067] 3, column section; 3-1, outer side steel structure layer; 3-1-1, bottom end cover plate; 3-1-2, column section angle steel; 3-1-3, top end cover plate; 3-1-4, bottom end cover plate; 3-1-5, top end cover plate; 3-1-6, middle cover plate; 3-2, inner side net rack structure; 3-2-1, inner layer fiber net rack; 3-2-2, steel reinforcement net rack; 3-2-3, outer layer fiber net rack; 3-3, high-strength concrete;

[0068] 4, support section; 4-1, support steel frame; 4-1-1, lower end plate; 4-1-2, support section angle steel; 4-1-3, upper end plate; 4-1-4, support section cover plate; 4-1-5, support section connecting plate; 4-2, support section bidirectional steel reinforcement adapter; 4-3, support section concrete; 4-4, pneumatic fragmentation device; 4-4-1, outer guide pipe; 4-4-1a, liquid carbon dioxide filling channel; 4-4-1b, positive electrode connecting end; 4-4-1c, negative electrode connecting end; 4-4-2, cover. DETAILED DESCRIPTION

[0069] In order to further understand the content of the application, the application is described in detail in combination with the drawings and examples.

[0070] [EXAMPLE]

[0071] In combination with Figure 1 and Figure 2 shown, the production method of the fabricated high-strength toughness composite precast column pile of the embodiment contains the following steps:

[0072] S1, column pile design: according to the engineering drawings and related materials, the column pile design drawing is made; the above-mentioned engineering drawings and related materials include but are not limited to:

[0073] Engineering geological investigation report: detailed description of the geological conditions of the foundation pit area, including soil layer distribution, groundwater level, foundation bearing capacity and other parameters. These information is crucial for determining the structural form, length, diameter and other design parameters of the column pile. For example, in soft soil foundation, column pile needs to have higher compression and uplift resistance to prevent foundation pit deformation and leakage.

[0074] Foundation pit support design drawing: clear the shape, size, depth of foundation pit and the type and arrangement of support structure. As a key component of foundation pit support system, the position, number and spacing of column pile need to be closely matched with the foundation pit support design. For example, in large deep foundation pit engineering, column piles are usually arranged uniformly at certain intervals to ensure the overall stability of the foundation pit.

[0075] Building structure design drawing: understand the structural form, load distribution and bearing requirements of column pile of building. Column pile needs to bear the vertical load of the upper structure and transmit it to the foundation. Therefore, the load parameters in the building structure design drawing are important basis for column pile design. For example, for high-rise buildings, column piles need to have higher bearing capacity to meet the safety requirements of buildings.

[0076] Construction organization design document: including construction schedule, construction technology selection, construction equipment configuration and other contents. These documents help to determine the production schedule and construction sequence of column pile, ensuring the coordination between production and construction.

[0077] Through the collection and analysis of the above engineering drawings and related materials, the designer can fully understand the engineering requirements and site conditions, and provide accurate basis for the design of column pile. The design drawing of column pile should include the structural form of column pile, the size parameters of column pile, the connection node design, the pre-embedded part arrangement and the construction detail description, etc. Referring to Figure 2 The assembled high-strength toughness composite prefabricated column pile of the embodiment includes a foundation pile segment 1, a bottom plate segment 2, a column segment 3, and a support segment 4, wherein,

[0078] The foundation pile segment 1 is a prefabricated square pile, including a reinforcement cage 1-1, a pile end steel plate welding piece 1-2, and square pile concrete 1-3;

[0079] The bottom plate segment 2 includes a rectangular steel frame 2-1 and a bottom plate segment concrete 2-3 filled in the rectangular steel frame 2-1, and a bottom plate segment double-direction reinforcement connector 2-2 is pre-embedded in the bottom plate segment 2 for connecting with the reinforcement structure in the cast-in-place foundation pit bottom plate in two directions;

[0080] The column segment 3 comprises an outer steel structure layer 3-1 and an inner net structure 3-2 inside the outer steel structure layer 3-1, and the outer steel structure layer 3-1 and the inner net structure 3-2 are integrally connected by pouring high-strength concrete 3-3;

[0081] The support segment 4 comprises a support steel frame 4-1 and support segment concrete 4-3 filled in the support steel frame 4-1, and a support segment two-way steel bar connector 4-2 for connecting the steel bar structure in the cast-in-place support beam in two directions is pre-embedded in the support segment 4.

[0082] Each pile segment of the column pile can be designed respectively, and the relevant design drawings are important basis for the production and construction of the column pile, and the accuracy and integrity thereof are directly related to the quality and safety of the project.

[0083] S2, prefabricated part production: according to the column pile design drawings, each pile segment component of the foundation pile segment 1, the bottom plate segment 2, the column segment 3 and the support segment 4 is respectively manufactured. Before starting production, sufficient production preparation is needed, including raw material procurement, production equipment debugging, personnel training and the like. Through sufficient production preparation, a good foundation can be provided for the production of the column pile, and the smooth progress of the production process and the stability of the product quality can be ensured.

[0084] S3, assembly manufacturing: each pile segment component is installed into the corresponding mold, and the concrete is poured and solidified to obtain the prefabricated foundation pile segment 1, the bottom plate segment 2, the column segment 3 and the support segment 4. The inner surface of the mold needs to be smooth and flat to ensure the appearance quality of the column pile.

[0085] The prefabricated high-strength and toughness composite prefabricated column pile production method of the embodiment can manufacture the foundation pile segment 1, the bottom plate segment 2, the column segment 3 and the support segment 4 of the column pile through the prefabricated production method, the high-efficiency construction of the column pile can be realized through the on-site assembly process of each pile segment, the strength and toughness of each pile segment are enhanced, the column pile can be constructed by using the static pressure process, the construction efficiency is significantly improved, and the construction process is simpler; meanwhile, the foundation pile segment 1 and the column segment 3 are assembled and connected through the bottom plate segment 2, the column segments 3 are assembled and connected through the support segment 4, the connection strength is higher, the on-site operation is convenient, and due to the improvement of the strength and toughness of the column pile, the brittle failure of the column pile in the construction process is avoided, and the column segment 100% recycling of the column pile is realized. In addition, the bottom plate segment two-way steel bar connector 2-2 for connecting the steel bar structure in the cast-in-place foundation pit bottom plate in two directions is pre-embedded in the bottom plate segment 2, and the support segment two-way steel bar connector 4-2 for connecting the steel bar structure in the cast-in-place support beam in two directions is pre-embedded in the support segment 4, which can improve the connection firmness between the foundation pit bottom plate and the column pile and between the foundation pit support beam and the column pile, and ensure the stability of the deep foundation pit support.

[0086] AsFigure 3 As shown in the above step S2, the pile end steel plate welding piece 1-2 of the foundation pile section 1 includes a pile end end plate 1-2-1, a pile end connecting angle steel 1-2-2, and a pile end patch plate 1-2-3. The four pile end connecting angle steels 1-2-2 are respectively welded and fixed at the four corners of the pile end end plate 1-2-1, and the pile end patch plate 1-2-3 is welded and fixed between the adjacent pile end connecting angle steels 1-2-2. Compared with the existing prefabricated square pile, the pile end patch plate design is added to ensure the connection reliability of the foundation pile section 1 and the upper column section 3. In step S3, the two ends of the steel reinforcement cage 1-1 are respectively provided with a group of pile end steel plate welding pieces 1-2, and the foundation pile section 1 is one of a prefabricated solid square pile, a prefabricated hollow square pile, a prestressed prefabricated solid square pile, and a prestressed prefabricated hollow square pile. Figure 4 As shown in the above step S2, the pile end steel plate welding piece 1-2 of the foundation pile section 1 includes a pile end end plate 1-2-1, a pile end connecting angle steel 1-2-2, and a pile end patch plate 1-2-3. The four pile end connecting angle steels 1-2-2 are respectively welded and fixed at the four corners of the pile end end plate 1-2-1, and the pile end patch plate 1-2-3 is welded and fixed between the adjacent pile end connecting angle steels 1-2-2. Compared with the existing prefabricated square pile, the pile end patch plate design is added to ensure the connection reliability of the foundation pile section 1 and the upper column section 3. In step S3, the two ends of the steel reinforcement cage 1-1 are respectively provided with a group of pile end steel plate welding pieces 1-2, and the foundation pile section 1 is one of a prefabricated solid square pile, a prefabricated hollow square pile, a prestressed prefabricated solid square pile, and a prestressed prefabricated hollow square pile.

[0087] As shown in the above step S2, the pile end steel plate welding piece 1-2 of the foundation pile section 1 includes a pile end end plate 1-2-1, a pile end connecting angle steel 1-2-2, and a pile end patch plate 1-2-3. The four pile end connecting angle steels 1-2-2 are respectively welded and fixed at the four corners of the pile end end plate 1-2-1, and the pile end patch plate 1-2-3 is welded and fixed between the adjacent pile end connecting angle steels 1-2-2. Compared with the existing prefabricated square pile, the pile end patch plate design is added to ensure the connection reliability of the foundation pile section 1 and the upper column section 3. In step S3, the two ends of the steel reinforcement cage 1-1 are respectively provided with a group of pile end steel plate welding pieces 1-2, and the foundation pile section 1 is one of a prefabricated solid square pile, a prefabricated hollow square pile, a prestressed prefabricated solid square pile, and a prestressed prefabricated hollow square pile. Figure 5 As shown in the above step S2, the pile end steel plate welding piece 1-2 of the foundation pile section 1 includes a pile end end plate 1-2-1, a pile end connecting angle steel 1-2-2, and a pile end patch plate 1-2-3. The four pile end connecting angle steels 1-2-2 are respectively welded and fixed at the four corners of the pile end end plate 1-2-1, and the pile end patch plate 1-2-3 is welded and fixed between the adjacent pile end connecting angle steels 1-2-2. Compared with the existing prefabricated square pile, the pile end patch plate design is added to ensure the connection reliability of the foundation pile section 1 and the upper column section 3. In step S3, the two ends of the steel reinforcement cage 1-1 are respectively provided with a group of pile end steel plate welding pieces 1-2, and the foundation pile section 1 is one of a prefabricated solid square pile, a prefabricated hollow square pile, a prestressed prefabricated solid square pile, and a prestressed prefabricated hollow square pile.

[0088] As shown in the above step S2, the pile end steel plate welding piece 1-2 of the foundation pile section 1 includes a pile end end plate 1-2-1, a pile end connecting angle steel 1-2-2, and a pile end patch plate 1-2-3. The four pile end connecting angle steels 1-2-2 are respectively welded and fixed at the four corners of the pile end end plate 1-2-1, and the pile end patch plate 1-2-3 is welded and fixed between the adjacent pile end connecting angle steels 1-2-2. Compared with the existing prefabricated square pile, the pile end patch plate design is added to ensure the connection reliability of the foundation pile section 1 and the upper column section 3. In step S3, the two ends of the steel reinforcement cage 1-1 are respectively provided with a group of pile end steel plate welding pieces 1-2, and the foundation pile section 1 is one of a prefabricated solid square pile, a prefabricated hollow square pile, a prestressed prefabricated solid square pile, and a prestressed prefabricated hollow square pile. Figure 6 to Figure 8As shown, in step S2, the column segment 3 adopts a structural layer composite structure, and its inner space frame structure 3-2 is located inside the outer steel structure layer 3-1. The inner space frame structure 3-2 includes an inner fiber space frame 3-2-1, a steel reinforcement space frame 3-2-2, and an outer fiber space frame 3-2-3. The steel reinforcement space frame 3-2-2 is connected by main bars and stirrups. Both the inner fiber space frame 3-2-1 and the outer fiber space frame 3-2-3 are made of FRP high-strength fiber mesh. In step S3, the outer fiber space frame 3-2-3 is located outside the steel reinforcement space frame 3-2-2, and the inner fiber space frame 3-2-1 is located inside the steel reinforcement space frame 3-2-2. The steel bars used in the 3-2-2 steel reinforcement mesh should have good weldability and corrosion resistance to ensure the long-term stability of the column piles. The FRP high-strength fiber mesh has good tensile strength and corrosion resistance, which can effectively improve the toughness of the column piles. In order to ensure the tight connection between the FRP high-strength fiber mesh and the 3-2-2 steel reinforcement mesh (steel cage), a special connector needs to be set between the fiber mesh and the steel cage. The connector can be a metal cable tie or a special fiber-reinforced plastic cable tie to fix the fiber mesh to the steel cage. When fixing, the spacing of the connector should be uniform, usually not greater than 300mm, to ensure that the fiber mesh does not shift during the concrete pouring process. Compared with existing steel lattice columns, steel lattice columns are limited by their own structure and cannot withstand high pressure compression. Especially under static pressure pile clamping or top pressure, steel lattice columns are prone to compressive failure. In addition, in order to prevent brittle failure of lattice columns, they often need to be made of thick steel plates and angle steel welded together. The steel consumption of lattice columns is large and their compressive and bending resistance is limited. In this embodiment, column segment 3 adopts a composite structure. The inner grid structure 3-2 and high-strength concrete 3-3 enhance the strength of the outer steel structure layer 3-1, and at the same time form an integral column segment 3, which together exerts the compressive, bending and impact resistance performance. The use of inner and outer fiber mesh and steel mesh can further improve the strength and toughness of the column segment. Column segment 3 is composed of four structural layers from the inside out (inner fiber mesh 3-2-1, steel mesh 3-2-2, outer fiber mesh 3-2-3, and outer steel structure layer 3-1), which reduces the overall steel consumption. While improving the structural strength, toughness, and tensile strength of the column pile, it lowers the manufacturing cost, giving the column pile compressive, bending, and impact resistance properties. Furthermore, as... Figure 6As shown, in the step S2, the outer steel structure layer 3-1 includes a bottom end cover plate 3-1-1, a column segment angle steel 3-1-2, a top end cover plate 3-1-3, a bottom end batten plate 3-1-4, a top end batten plate 3-1-5 and a middle batten plate 3-1-6, the bottom end cover plate 3-1-1 and the top end cover plate 3-1-3 are connected into a rectangular frame structure by four column segment angle steels 3-1-2, the lower ends of the four column segment angle steels 3-1-2 are connected by the bottom end batten plate 3-1-4 in sequence, the upper ends of the four column segment angle steels 3-1-2 are connected by the top end batten plate 3-1-5 in sequence, and a plurality of middle batten plates 3-1-6 are arranged between the four column segment angle steels 3-1-2 from top to bottom in sequence. The structure of the outer steel structure layer 3-1 is similar to the existing lattice column, and the difference is that the column segment 3 uses high-strength concrete 3-3 to connect the outer steel structure layer 3-1 and the inner net rack structure 3-2 into one body, the size and thickness of the bottom end cover plate 3-1-1, the column segment angle steel 3-1-2, the top end cover plate 3-1-3, the bottom end batten plate 3-1-4, the top end batten plate 3-1-5 and the middle batten plate 3-1-6 can be designed to be smaller, and the batten plate interval can be designed to be larger, thereby reducing the amount of steel and the cost of steel material used in the column segment. In step S3, the high-strength concrete 3-3 is added with polypropylene fiber reinforcing material, which can improve the crack resistance and impact resistance of the concrete, increase the toughness of the concrete, prolong the service life of the column segment 3, and meet the requirements of repeated recycling of the column segment 3. The high-strength concrete 3-3 should have high compressive strength and impermeability, and the polypropylene fiber can improve the crack resistance and toughness of the concrete. During production, the amount of polypropylene fiber should be adjusted according to design requirements, usually 0.1% to 0.2% of the volume of the concrete. The length and diameter of the polypropylene fiber should meet the design requirements to ensure its uniform distribution in the concrete; a special concrete mixing equipment is used to mix the high-strength concrete according to the designed mixing ratio; the mixed high-strength concrete is poured into a mold of a steel reinforcement cage and a FRP fiber grid, and a layered pouring method is used during pouring, with each layer being not more than 300 mm thick to ensure the compactness of the concrete; and a vibrating rod is used for vibrating during pouring, and the vibrating time should be controlled to the time when floating slurry appears on the surface of the concrete without air bubbles.

[0089] In the embodiment, the column segment 3 is a solid or hollow precast pile structure, Figure 7The structural diagram of the hollow column segment is shown. In addition, in step S3, the foundation pit section monitoring sensor and the wireless communication module are also built in the column segment 3. The foundation pit section monitoring sensor communicates with the background monitoring system through the wireless communication module, providing data support for intelligent construction, which is conducive to intelligent control of foundation pit deformation. The foundation pit section monitoring sensor includes stress monitor, displacement monitor and axial force detector and other sensors. Since the column segment 3 can be 100% recycled, the foundation pit section monitoring sensor and the wireless communication module inside it can be reused, reducing the sensor reuse and maintenance cost. Specifically, stress sensors can be arranged in the middle of the pile body and the connection node to monitor the stress of the pile body during construction; displacement sensors are arranged at the top and bottom of the pile to monitor the displacement change of the pile body. The wireless communication module can use 5G or Internet of Things technology to transmit the data collected by the sensor to the background monitoring system in real time. Through the monitoring system, construction personnel can real-time understand the stress, displacement and strain of the column pile, so as to optimize the construction parameters and ensure the construction quality. Further, the monitoring data can be analyzed to establish a dynamic model during construction. Through model analysis, possible problems in the construction process can be predicted and measures can be taken in advance to handle them. In addition, the monitoring data is compared with the construction specification and design requirements to find deviations in time and make adjustments. For example, when the pile body displacement exceeds the allowed value, the deviation can be corrected by adjusting the pile pressing speed or increasing the support measures.

[0090] Referring to Figure 9 As shown in the above step S2, the support segment 4 and the support beam are formed into a support node by cast-in-place. Considering the difficulty of removing the cast-in-place support beam, the pneumatic fragmentation device 4-4 is arranged in the support steel frame 4-1. The support segment 4 can be effectively and conveniently broken and removed during the support removal stage, so that the support beam is simple and convenient to remove, and the steel structure of the support segment 4 can still be recycled for the second time. Specifically, referring to Figure 10 to Figure 11As shown, the pneumatic cracking device 4-4 adopts the principle of gas explosion, and has an outer lead pipe 4-4-1 and a cover 4-4-2 detachably mounted at the end of the outer lead pipe 4-4-1. The outer lead pipe 4-4-1 is respectively provided with a liquid carbon dioxide filling channel 4-4-1a, a positive electrode connecting pipe 4-4-1b and a negative electrode connecting pipe 4-4-1c. In step S3, the outer lead pipe 4-4-1 is led out from one side of the support section concrete 4-3. During the pressing process, the outer lead pipe 4-4-1 is blocked by the cover 4-4-2 to prevent dirt and other impurities from entering the outer lead pipe 4-4-1; when pouring the support beam, according to the position of the support beam, the outer lead pipe 4-4-1 can be connected with the outer hose, and the other end of the outer hose is outside the support beam, which is convenient for subsequent breaking operation; when the support is removed, liquid carbon dioxide is injected into the pneumatic cracking device 4-4 through the liquid carbon dioxide filling channel 4-4-1a, and the power supply is connected through the positive electrode connecting pipe 4-4-1b and the negative electrode connecting pipe 4-4-1c, and the liquid carbon dioxide is converted into high-pressure carbon dioxide gas by electrode heating, so that the concrete of the support section 4 is broken from the inside, and the support beam is removed and the support steel frame in the support section 4 is recycled. Figure 9 As shown, the support steel frame 4-1 includes a lower end plate 4-1-1, a support section angle steel 4-1-2, an upper end plate 4-1-3 and a support section plate 4-1-4. The lower end plate 4-1-1 and the upper end plate 4-1-3 are fixedly connected by four support section angle steels 4-1-2, and the four support section angle steels 4-1-2 are sequentially connected by the support section plates 4-1-4. The lower end plate 4-1-1, the support section angle steel 4-1-2, the upper end plate 4-1-3 and the support section plate 4-1-4 can be connected and fixed by welding process. The upper and lower ends of the four support section angle steels 4-1-2 are respectively provided with support section connecting plates 4-1-5 for connecting the column section 3. The support section connecting plate 4-1-5 can adopt an angle steel structure, which can be connected with the angle steel at the four corners of the column section 3 by a flat head bolt, facilitating the quick disassembly of the column section 3. The length of the column section 3 can be determined according to the floor height of the underground floor, and the number of use can be determined according to the depth of the foundation pit or the number of underground floors. The upper and lower adjacent column sections 3 are connected by the support section 4.

[0091] In addition, in the above column pile production method, corresponding production equipment needs to be used in each production step, such as steel structure processing equipment, steel cage processing equipment, concrete mixing equipment, and mold and forming equipment. The steel structure processing equipment includes angle steel cutting machine, welding robot, drilling machine, etc., which need to be debugged and calibrated to ensure processing accuracy and production efficiency, such as the length error of the cut angle steel should not exceed ±2mm. The steel cage processing equipment includes steel bending machine, steel cutting machine, welding equipment, etc., which need to be maintained and debugged to ensure the processing quality of the steel cage, such as using the steel cutting machine to cut the steel to the designed length, the end of the cut steel should be smooth without burr, and the length error should be controlled within ±5mm. The concrete mixing equipment needs to be tested according to the design mix ratio, and the mixing time and speed need to be adjusted to meet the performance requirements of high-strength concrete. The mold and forming equipment need to be cleaned, inspected and debugged to ensure the dimensional accuracy and forming quality of the mold.

[0092] After the above column pile production is completed, it enters the transportation stage. Before transportation, each pile section of the column pile should be protected to avoid damage to the column pile during transportation; and after the column pile is transported to the construction site, it should be immediately inspected, including the appearance quality, size deviation, fixing condition, etc. of the column pile. After transportation to the construction site, the next step is the construction stage.

[0093] The following will be combined Figure 12 The construction method of the above assembled high-strength toughness composite prefabricated column pile will be described in detail.

[0094] The construction method of the column pile produced by the production method of the assembled high-strength toughness composite prefabricated column pile of the present embodiment comprises the following steps:

[0095] S1, equipment debugging: according to the construction position of the column pile, install the static pile press and debug it to ensure that the hydraulic system, electrical system and walking system of the static pile press are in normal operation; install the pile feeder on the static pile press and debug it to ensure that the pile feeder can smoothly press the column pile into the design elevation; after the pile feeder is debugged, it is removed. It should be noted that before construction, the construction site should be cleaned and leveled to ensure the flatness and stability of the construction site. The construction position of the column pile is lofted, and the lofting accuracy should be controlled within the allowable range. The static pile press should be selected according to the diameter, length and design bearing capacity of the column pile, and its tonnage should meet the pressing requirements of the column pile, while considering the site conditions of the construction site. When installing the static pile press, the level and stability of the equipment should be ensured. During the debugging of the static pile press, pressure test should be performed to ensure that the pile pressing force and speed of the equipment meet the design requirements. The pile feeder is a key tool for pressing the column pile into the design elevation, and the appropriate pile feeder should be selected according to the size and shape of the column pile; the material of the pile feeder should have sufficient strength and stiffness to withstand the reaction force during the pressing process.

[0096] S2, foundation pile section construction: the foundation pile section 1 is the key part of the connection between the column pile and the foundation pit bottom plate, and its construction quality directly affects the stability of the column pile. Before the construction of the foundation pile section 1, the installation position of the column pile should be lofted, and the lofting accuracy should be controlled within the allowable range. The foundation pile section 1 is pressed into the design elevation using the static pile press, and during the pressing process, the pressing speed should be controlled to avoid damage or deflection of the column pile due to excessive pressing speed, and the pressing speed is controlled at 0.5-1.0 m / min; after the pressing is completed, the perpendicularity of the foundation pile section 1 is checked, and the perpendicularity deviation of the foundation pile section 1 is controlled within 0.5%.

[0097] S3, sectional connection and pile pressing: first, connect the column section 3 on the top of the foundation pile section 1 through the bottom plate section 2, and press the first column section 3 into the design elevation using the static pile press; the connection method of the foundation pile section 1 and the bottom plate section 2 can be welding or mechanical connection, and the connection method of the bottom plate section 2 and the column section 3 can be bolt connection, and the connection should ensure the firmness and reliability of the connection; then connect the remaining column sections 3 through the support sections 4 in turn, and press the column sections 3 into the design elevation by using the static pile press; the pressing speed of the column section 3 is controlled at 0.5-1.0 m / min. The construction of the support section 4 should be carried out according to the design requirements of the foundation pit support beam, and the connection between the support section 4 and the support beam can be cast-in-place concrete connection or mechanical connection.

[0098] S4, pile driver: install the pile driver on the static pile machine, and connect with the last section of the column 3, use the pile driver and the static pile machine to press the last section of the column 3 into the design elevation, at this time the foundation pile section 1 is located in the foundation pit bottom stratum, and the column section 3 is located in the foundation pit; During the pile driving process, the pile driving speed should be controlled to avoid damage or deflection of the column pile due to excessive pile driving speed. The pile driving speed is generally controlled at 0.5-1.0 m / min. After the pile driving is completed, the verticality of the column pile is checked, and the verticality deviation should not exceed 0.5%; the pressure depth of the column pile is measured, and the pressure depth should meet the design requirements.

[0099] S5, connection of foundation pit support beam: after the column pile is pressed, the soil in the foundation pit is excavated, and the support beam is connected with the corresponding support section 4 from top to bottom layer by layer, and the foundation pit is supported. During construction, the soil in the foundation pit is excavated layer by layer, and the support beam is constructed in turn to support the foundation pit, until the soil is excavated to the bottom. When cast-in-place support beam is used, the steel bars in the support beam are inserted into the support section bidirectional steel bar connector 4-2 of the support section 4 for connection.

[0100] S6, foundation pit bottom plate construction: after the soil is excavated to the foundation pit bottom, the foundation pit bottom plate construction is started, and the foundation pit bottom plate is connected with the bottom plate section 2 together; then the main structure in the foundation pit is constructed layer by layer from bottom to top. During construction, the outer water stop plate 2-4 and the peg 2-5 are welded on the bottom plate section 2, and the peg 2-5 is fixed with the bottom plate, and at the same time the steel bars of the bottom plate are inserted into the bottom plate bidirectional steel bar connector 2-2 for connection.

[0101] The above-mentioned prefabricated high-strength and ductile composite prefabricated column pile construction method is more simple and efficient, has small construction noise and less pollution, and the construction depth is not limited in principle, which can be used for deeper foundation pit support, and has wider application range.

[0102] After the main structure in the foundation pit is constructed, the step S7 of disassembling and recycling is entered. In the step S7 of disassembling and recycling, the column section 3 is first removed, and then the support section 4 and the support beam are removed; the recycled and repaired column section 3 is designed and reused according to the design requirements of the next project. When cast-in-place support beam is used, the pneumatic fragmentation device 4-4 is pre-installed in the support section 4, and the support section 4 is broken by the pneumatic fragmentation device 4-4 during disassembly, which facilitates the rapid disassembly of the cast-in-place support beam, reduces the difficulty of disassembly, and improves the disassembly efficiency. During the disassembly process, special disassembly tools should be used to avoid damage to the column section 3; during disassembly, it should be done from top to bottom in sections, and the disassembled column section 3 should be cleaned and stored in time. During the reuse process, the quality of the column section 3 should be strictly checked to ensure that it meets the requirements of reuse.

[0103] The production method and construction method of the assembled high-strength and ductile composite precast column pile of the present application not only have significant advantages in technology, but also perform well in economy and environmental benefits. Through optimization design and construction technology, the column pile can significantly reduce construction cost and reduce environmental impact.

[0104] The following advantages are shown in economy:

[0105] 1. Reducing material cost: Using high-strength and high-ductility composite materials reduces the amount of traditional materials. For example, by using FRP fiber mesh and high-strength concrete, the amount of steel and ordinary concrete is reduced, and the material cost is reduced. The recyclability design of the column section makes the material can be reused multiple times, further reducing the overall cost of the project. For example, the column section after demolition can be used for the next project after repair and reprocessing, reducing material waste.

[0106] 2. Improve construction efficiency: The factory production and on-site assembly construction of precast column piles significantly shorten the construction period. Compared with traditional cast-in-place piles, the construction speed of precast column piles is increased by 30% to 50%, reducing the rental cost of construction equipment and labor cost. The application of intelligent construction equipment and monitoring technology improves the construction precision and quality, reducing the rework and repair cost in the construction process.

[0107] 3. Long-term economic benefits: The high-strength and high-ductility design of the column pile significantly prolongs its service life in complex geological conditions, reducing the repair and replacement cost due to pile damage. The recyclability design of the column pile makes the material can be reused multiple times, reducing the long-term operation cost of the project.

[0108] The following advantages are shown in environmental benefits:

[0109] 1. Reduce construction pollution: The factory production of precast column piles reduces noise, dust and wastewater discharge at the construction site. Compared with traditional cast-in-place piles, precast column piles produce almost no mud pollution during construction, reducing environmental damage. The application of intelligent construction equipment and monitoring technology reduces energy consumption and waste discharge during construction. For example, by optimizing the pile pressing force and speed, the energy consumption of the equipment is reduced.

[0110] 2. Recyclability of materials: The recyclability design of the column pile makes the material can be reused multiple times, reducing the generation of construction waste. For example, the column pile after demolition can be used for the next project after repair and reprocessing, reducing the exploitation of natural resources. The high-strength and high-ductility design of the column pile makes it more durable during use, reducing material waste due to pile damage.

[0111] 3. Green construction: The design and construction of the prefabricated high-strength toughness composite precast column pile fully embodies the concept of green construction. Through optimization of design and construction technology, the impact on the environment is reduced, meeting the requirements of sustainable development. The intelligent construction and monitoring technology of the column pile further improves the environmental level of the construction process, providing technical support for green construction.

[0112] In summary, the prefabricated high-strength toughness composite precast column pile production method and construction method of the present application is a prefabricated column pile technology with high strength, high toughness, recyclability, reliable connection and intelligent construction. It has significant technical advantages, economic benefits and environmental benefits. Through optimization of design and construction technology, the column pile can significantly improve construction efficiency, reduce construction cost, and reduce the impact on the environment. It effectively solves the problems of long construction period, non-recyclable materials, insufficient connection stiffness of traditional column piles, and meets the requirements of green construction and intelligent construction.

Claims

1. A production method of a high-strength and ductile composite precast column pile, characterized in that, The method comprises the following steps: S1, column pile design: according to the engineering drawings and related data, the column pile design drawing is prepared; the column pile comprises a foundation pile section (1), a bottom plate section (2), a column section (3) and a support section (4), wherein, The foundation pile section (1) is a prefabricated square pile, comprising a reinforcement cage (1-1), a pile end steel plate welding part (1-2) and square pile concrete (1-3); The bottom plate section (2) comprises a rectangular steel frame (2-1) and a bottom plate section concrete (2-3) filled in the rectangular steel frame (2-1), and a bottom plate section bidirectional steel bar connector (2-2) for connecting with the steel bar structure in the cast-in-place foundation pit bottom plate in two directions is pre-embedded in the bottom plate section (2); The column section (3) comprises an outer side steel structure layer (3-1) and an inner side net rack structure (3-2) located on the inner side of the outer side steel structure layer (3-1), and the outer side steel structure layer (3-1) and the inner side net rack structure (3-2) are connected into one body by high-strength concrete (3-3) pouring; The support section (4) comprises a support steel frame (4-1) and a support section concrete (4-3) filled in the support steel frame (4-1), and a support section bidirectional steel bar connector (4-2) for connecting with the steel bar structure in the cast-in-place support beam in two directions is pre-embedded in the support section (4); S2, prefabricated part production: according to the column pile design drawing, each pile section component of the foundation pile section (1), the bottom plate section (2), the column section (3) and the support section (4) is respectively made; S3, assembly production: each pile section component is installed into the corresponding mold, and the concrete is poured and solidified to obtain the prefabricated foundation pile section (1), the bottom plate section (2), the column section (3) and the support section (4); wherein: In step S2, the inner side net rack structure (3-2) comprises an inner layer fiber net rack (3-2-1), a steel bar rack (3-2-2) and an outer layer fiber net rack (3-2-3), the steel bar rack (3-2-2) is connected by main reinforcement and stirrup, and the inner layer fiber net rack (3-2-1) and the outer layer fiber net rack (3-2-3) are both made of FRP high-strength fiber grid; in step S3, the outer layer fiber net rack (3-2-3) is located on the outer side of the steel bar rack (3-2-2), and the inner layer fiber net rack (3-2-1) is located on the inner side of the steel bar rack (3-2-2); In step S2, the outer steel structure layer (3-1) includes a bottom end cover plate (3-1-1), a column segment angle steel (3-1-2), a top end cover plate (3-1-3), a bottom end splice plate (3-1-4), a top end splice plate (3-1-5) and a middle splice plate (3-1-6), the bottom end cover plate (3-1-1) and the top end cover plate (3-1-3) are connected into a rectangular frame structure by four column segment angle steels (3-1-2), the lower ends of the four column segment angle steels (3-1-2) are sequentially connected by the bottom end splice plate (3-1-4), the upper ends are sequentially connected by the top end splice plate (3-1-5), and a plurality of middle splice plates (3-1-6) are sequentially arranged between the four column segment angle steels (3-1-2) from top to bottom; in step S3, the high-strength concrete (3-3) is added with polypropylene fiber reinforced material; In step S2, the supporting steel frame (4-1) is further provided with a pneumatic fragmentation device (4-4), the pneumatic fragmentation device (4-4) has an outer guide pipe (4-4-1) and a cover (4-4-2) detachably mounted at the end of the outer guide pipe (4-4-1), the outer guide pipe (4-4-1) is respectively provided with a liquid carbon dioxide filling channel (4-4-1a), a positive electrode connecting pipe (4-4-1b) and a negative electrode connecting pipe (4-4-1c); in step S3, the outer guide pipe (4-4-1) is led out from one side of the supporting segment concrete (4-3).

2. The production method of the fabricated high-strength toughness composite precast column pile according to claim 1, characterized in that: In step S2, the pile end steel plate welding member (1-2) of the foundation pile segment (1) includes a pile end end plate (1-2-1), a pile end connecting angle steel (1-2-2) and a pile end splice plate (1-2-3), four pile end connecting angle steels (1-2-2) are respectively welded and fixed at the four corners of the pile end end plate (1-2-1), and the pile end splice plate (1-2-3) is welded and fixed between adjacent pile end connecting angle steels (1-2-2); in step S3, the steel reinforcement cage (1-1) is provided with a group of pile end steel plate welding members (1-2) at both ends, and the foundation pile segment (1) is one of a prefabricated solid square pile and a prefabricated hollow square pile.

3. The production method of the fabricated high-strength toughness composite precast column pile according to claim 1, characterized in that: In step S2, the rectangular steel frame (2-1) of the bottom plate segment (2) includes a bottom end plate (2-1-1), a bottom plate segment angle steel (2-1-2), a top end plate (2-1-3) and a bottom plate segment splice plate (2-1-4), the bottom end plate (2-1-1) and the top end plate (2-1-3) are fixedly connected by four bottom plate segment angle steels (2-1-2), and the four bottom plate segment angle steels (2-1-2) are sequentially connected by the bottom plate segment splice plate (2-1-4); the upper and lower ends of the four bottom plate segment angle steels (2-1-2) are further respectively provided with bottom plate segment connecting plates (2-1-6) for connecting the foundation pile segment (1) and the column segment (3); the inner side of the rectangular steel frame (2-1) is further pre-buried with an inner side water stop plate (2-1-5), and the outer side of the bottom plate segment angle steel (2-1-2) is further welded with an outer side water stop plate (2-4) and a plurality of studs (2-5) after the foundation pit is excavated.

4. The production method of the fabricated high-strength toughness composite precast column pile according to claim 1, characterized in that: In step S3, the column segment (3) is also internally provided with a foundation pit section monitoring sensor and a wireless communication module, and the foundation pit section monitoring sensor is in communication connection with the background monitoring system through the wireless communication module.

5. The production method of the fabricated high-strength toughness composite precast column pile according to claim 1, characterized in that: In step S2, the support steel frame (4-1) comprises a lower end plate (4-1-1), support segment angle steels (4-1-2), an upper end plate (4-1-3) and support segment patch plates (4-1-4), the lower end plate (4-1-1) and the upper end plate (4-1-3) are fixedly connected through four support segment angle steels (4-1-2), and the four support segment angle steels (4-1-2) are sequentially connected through support segment patch plates (4-1-4); the upper and lower ends of the four support segment angle steels (4-1-2) are also respectively provided with support segment connecting plates (4-1-5) for connecting the column segment (3).

6. A construction method of the column pile prepared by the production method of the fabricated high-strength and ductile composite precast column pile according to any one of claims 1 to 5, characterized in that, Comprise the following steps: S1, equipment debugging: according to the construction position of the column pile, install the static pressure pile machine, and debug the static pressure pile machine to ensure that the hydraulic system, electrical system and walking system of the static pressure pile machine operate normally; install the pile feeder on the static pressure pile machine and debug the pile feeder to ensure that the pile feeder can smoothly press the column pile into the design elevation; After the pile feeder is debugged, it is removed; S2, foundation pile segment construction: use the static pressure pile machine to press the foundation pile segment (1) into the design elevation, and the pressing speed is controlled at 0.5~1.0m / min, and the verticality deviation of the foundation pile segment (1) is controlled within 0.5%; S3, segmented connection and pile pressing: first, connect the column segment (3) to the top of the foundation pile segment (1) through the bottom plate segment (2), and use the static pressure pile machine to press the first column segment (3) into the design elevation; then sequentially connect the remaining column segments (3) through the support segments (4), and use the static pressure pile machine to press the column segments (3) into the design elevation; the pressing speed of the column segment (3) is controlled at 0.5~1.0m / min; S4, pile feeding of the pile feeder: install the pile feeder on the static pressure pile machine and connect it with the last column segment (3), and use the pile feeder and the static pressure pile machine to press the last column segment (3) into the design elevation, at this time the foundation pile segment (1) is located in the foundation pit bottom stratum and the column segment (3) is located in the foundation pit; S5, connection of the foundation pit support beam: after the column pile pressing is completed, the foundation pit soil is excavated, and the support beam is connected with the corresponding support segment (4) layer by layer from top to bottom to support the foundation pit; S6, foundation pit bottom plate construction: after the soil is excavated to the foundation pit bottom, the foundation pit bottom plate construction is started, and the foundation pit bottom plate is connected with the bottom plate segment (2); then the main structure in the foundation pit is constructed layer by layer from bottom to top.

7. A method of construction of a pile according to claim 6, characterised in that: After the main structure in the foundation pit is constructed, the step S7 of disassembly and recovery is entered; in the step S7 of disassembly and recovery, the column segment (3) is first removed, and then the support segment (4) and the support beam are removed; the recovered and repaired column segment (3) is designed and reused according to the design requirements of the next project.

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