A vertical support structure of a stiff composite pile and a column

Abstract

The present application relates to the technical field of stiff composite pile, and discloses a kind of stiff composite pile column integrated vertical support structure, including pile and column, pile includes outer pile and inner pile, inner pile is inserted into outer pile using static pressure drag reduction technology, and outer wall of inner pile is provided with helical groove;The outer wall of the inner pile of the present application is provided with continuous helical groove, the pitch of the helical groove is gradually changed, and the groove is a shallow arc structure, its spiral trajectory is gradually changed from dense to sparse and from shallow to deep from top to bottom, and the stress requirement of different depths of foundation pit is matched, the upper dense rib shallow groove is used to disperse high lateral pressure and reduce stress peak, to avoid cracking of the upper part of the inner pile due to stress concentration, the lower sparse distance deep groove is used to realize strong anchoring and improve the anti-pulling and anti-sliding performance, during the process of static pressure implantation of the inner pile into the outer pile, the filler in the outer pile can be continuously and gaplessly extruded into the helical groove, forming an inclined mechanical mortise and tenon locking structure, effectively solving the common problem of inner pile and outer pile interface debonding and sliding.

Description

Technical Field

[0001] This invention relates to the field of reinforced composite pile technology, and more particularly to a vertical support structure for an integrated reinforced composite pile. Background Technology

[0002] In the construction of foundation pit projects such as urban rail transit, high-rise buildings, and underground integrated pipe corridors, the vertical support system is the core component to ensure the structural safety of the entire process of foundation pit excavation, main structure construction and subsequent long-term use. It not only needs to bear the vertical axial force and bending moment transmitted by the superstructure and the top longitudinal beam, but also needs to resist the horizontal lateral pressure of the soil around the foundation pit and the groundwater seepage pressure. At the same time, it needs to adapt to the reciprocating alternating loads caused by construction vibration and soil displacement. It has extremely high requirements for the structure's bearing capacity, stability, durability and construction adaptability. In traditional reinforced composite piles, the outer piles serve as the water-stopping and retaining function, while the inner piles act as the core load-bearing components. The inner piles often have smooth outer walls or simple textured designs. The bonding force at the interface between the inner piles and the cement-soil and concrete filling materials inside the outer piles is poor. Under long-term vertical pull-out force and horizontal slippage force, the interface is prone to debonding and slippage. The inner piles and outer piles cannot form a cooperative load-bearing system. The lateral restraint effect of the outer piles and the core load-bearing function of the inner piles are disconnected. This not only fails to effectively improve the pull-out and slippage resistance, but also makes it difficult to achieve both water-stopping and load-bearing functions. Summary of the Invention

[0003] The purpose of this invention is to address the shortcomings of existing technologies by proposing a rigid composite pile-column integrated vertical support structure.

[0004] To achieve the above objectives, the present invention adopts the following technical solution: A rigid composite pile-column integrated vertical support structure includes: piles and columns. The piles serve as the foundation components of the vertical support, and the columns serve as the upper support components. The two are connected to form a complete pile-column integrated vertical support system, which jointly bears the vertical load, horizontal lateral pressure, and reciprocating alternating load during the construction and use of the foundation pit, ensuring the overall stability of the foundation pit. The piles consist of outer piles and inner piles. The outer piles form the retaining structure, while the inner piles are the load-bearing core. The inner piles are inserted concentrically into the outer piles using static pressure drag reduction technology to ensure coaxiality between the inner and outer piles and avoid additional bending moments caused by eccentric load distribution. The top of the inner pile extends out from the outer pile, and the extended part is fixedly connected to the bottom of the column to achieve continuous force transmission between the pile and the column. The top of the column is equipped with a top longitudinal beam, and the column is firmly connected to the top longitudinal beam through the top connection structure to form an overall support frame. The inner pile has continuous spiral grooves on its outer wall. The pitch of the spiral grooves is gradually changed, and the grooves are shallow-bottomed arc structures. The spiral trajectory gradually becomes denser and deeper from top to bottom, adapting to the stress requirements of different depths of the foundation pit. The upper dense rib shallow grooves are used to disperse high lateral pressure and reduce stress peaks, preventing cracking of the upper part of the inner pile due to stress concentration. The lower sparse deep grooves are used to achieve strong anchoring and improve pull-out and anti-slip performance. There are streamlined transition micro-protrusions between adjacent spiral grooves to eliminate stress sharp corners at the groove joints. The cross-section of the spiral grooves is a streamlined arc without sharp corners, which is suitable for static pressure drag reduction construction technology. During the static pressure implantation of the inner pile into the outer pile, the filling material in the outer pile can be continuously and seamlessly squeezed into the spiral groove, forming an oblique mechanical tenon and mortise locking structure. This not only ensures low resistance of static pressure pile driving, but also achieves anti-slip effect throughout the entire area of ​​the inner and outer piles, effectively solving the common industry problem of debonding and slippage at the interface between the inner and outer piles.

[0005] As a further embodiment of the present invention, the inner pile is made by splicing multiple core piles to adapt to the support requirements of different foundation pit depths, and the column is made by splicing multiple column bodies to adapt to the support requirements of different heights. Both ends of the core pile and the column body are fixedly provided with connecting end plates, which are welded to the core pile and the column body to provide a stable force-bearing foundation for the splicing connection and ensure smooth force transmission at the splicing point.

[0006] As a further embodiment of the present invention, an auxiliary end plate is provided between two adjacent core piles. The auxiliary end plate is adapted to the connecting end plate. The two adjacent core piles are fixedly connected by the connecting end plate and the auxiliary end plate, which further enhances the connection strength and integrity of the core pile splicing, avoids loosening or slippage at the splicing, and ensures the continuity of the overall force of the inner pile.

[0007] As a further embodiment of the present invention, two adjacent columns or columns and core piles are fixedly connected by connecting end plates. A closed shear key is provided on the inner wall of the splice. The closed shear key engages with the concrete structure of the splice and bears the main shear force at the splice, preventing shear slippage at the splice. A covering sleeve is provided on the outer wall of the splice. The covering sleeve completely covers the splice gap, playing a role in circumferential restraint and reinforcement. Multiple weld plates are provided on the outer side of the covering sleeve. The weld plates are evenly distributed to further fix the covering sleeve, enhance the lateral stiffness and fatigue resistance of the splice, and prevent the weld at the splice from cracking.

[0008] As a further embodiment of the present invention, the piles are rigid composite piles, which have the dual advantages of flexible enclosure and rigid load bearing. The inner piles are prestressed high-strength concrete pipe piles, which have the characteristics of high strength and high rigidity and can effectively bear vertical axial force and bending moment. The outer piles are cement-soil mixing piles, which can provide good side friction resistance and confining pressure, constrain the deformation of the inner piles, and at the same time play the role of water stop and soil stabilization. The columns are high-strength concrete hollow precast columns, which take into account strength and economy, reduce the self-weight of the structure, and meet the load bearing requirements of vertical support of the foundation pit.

[0009] As a further aspect of the present invention, a reinforced concrete core is provided inside the top of the column. The reinforced concrete core can significantly improve the stiffness, shear resistance and bending resistance of the top of the column, and avoid stress concentration and cracking due to the connection between the top of the column and the top longitudinal beam. A connecting anchor bar is provided at the top of the column, which is anchored into the interior of the top longitudinal beam to achieve a firm anchorage between the column and the top longitudinal beam, ensuring smooth force transmission and forming an overall force-bearing system.

[0010] As a further embodiment of the present invention, multiple steel ribs are arranged circumferentially on the outer wall of the top of the column. The steel ribs serve to strengthen the structural strength of the top of the column. The top of the steel ribs is provided with corbel anchor bars, which are anchored into the interior of the top longitudinal beam and work together with the connecting anchor bars to further improve the connection reliability between the column and the top longitudinal beam, enhance the shear and bending resistance of the connection node, and achieve a stable connection between the column and the top longitudinal beam.

[0011] As a further embodiment of the present invention, both the inner pile and the column are provided with a steel cage skeleton. The steel cage skeleton is composed of longitudinal main bars and stirrups. The longitudinal main bars bear the main tensile and compressive forces, and the stirrups restrain the longitudinal main bars, thereby enhancing the integrity and crack resistance of the structure. The steel cage skeleton of the inner pile is combined with the inner pile concrete to improve the bearing capacity of the inner pile. The steel cage skeleton of the column works in conjunction with the cast-in-place reinforced concrete core and the precast pipe wall of the column to ensure the structural strength and stability of the column.

[0012] As a further aspect of the present invention, the connecting end plates are fixedly connected by mechanical interlocking and welding. The mechanical interlocking structure achieves initial positioning and anti-slip at the splice, while the welding connection further enhances the splice strength. The dual connection method ensures the integrity and reliability of the splice, avoids loosening or separation at the splice, and ensures the stress safety of the entire support structure.

[0013] As a further embodiment of the present invention, multiple sets of columns are provided under the top longitudinal beam. The multiple sets of columns are evenly distributed and jointly bear the load transmitted by the top longitudinal beam. Shear bracing is used between adjacent sets of columns to ensure horizontal stability. The shear bracing is reliably connected to the columns to form a horizontal support system, which effectively resists the horizontal lateral pressure and reciprocating load of the foundation pit, prevents the columns from horizontally shifting or becoming unstable, and ensures the horizontal stiffness and overall stability of the entire foundation pit vertical support structure.

[0014] Compared with the prior art, the beneficial effects of the present invention are: The inner pile of this invention has a continuous spiral groove on its outer wall. The pitch of the spiral groove is gradually changed, and the groove is a shallow-bottomed arc structure. Its spiral trajectory gradually becomes denser and deeper from top to bottom, adapting to the stress requirements of different depths of the foundation pit. The upper dense rib shallow groove is used to disperse high lateral pressure and reduce stress peaks, avoiding cracking of the upper part of the inner pile due to stress concentration. The lower sparse deep groove is used to achieve strong anchoring and improve pull-out and anti-slip performance. There are streamlined transition micro-protrusion ribs between adjacent spiral grooves to eliminate stress sharp corners at the groove joints. The cross-section of the spiral groove is a streamlined arc without sharp corners, which is suitable for static pressure drag reduction construction technology. During the static pressure implantation of the inner pile into the outer pile, the filling material in the outer pile can be continuously and seamlessly squeezed into the spiral groove to form an oblique mechanical tenon and mortise locking structure. This not only ensures low resistance of static pressure pile driving, but also achieves anti-slip effect throughout the entire area of ​​the inner pile and the outer pile, effectively solving the common industry problem of debonding and slippage at the interface between the inner pile and the outer pile. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of a rigid composite pile-column integrated vertical support structure proposed in this invention. Figure 2 This is a schematic diagram of the erection of a rigid composite pile-column integrated vertical support structure proposed in this invention; Figure 3 This is a schematic diagram of the internal pile of a rigid composite pile-column integrated vertical support structure proposed in this invention; Figure 4 This is a schematic diagram of a column of a rigid composite pile-column integrated vertical support structure proposed in this invention; Figure 5 This is a schematic diagram of the reinforced concrete core of a rigid composite pile-column integrated vertical support structure proposed in this invention. Figure 6 This is a schematic diagram of the encasing sleeve of a rigid composite pile-column integrated vertical support structure proposed in this invention; Figure 7 This invention proposes a rigid composite pile-column integrated vertical support structure. Figure 4 Enlarged diagram of point A in the middle.

[0016] In the diagram: 100, pile; 110, outer pile; 120, inner pile; 121, spiral groove; 122, transition micro-convex rib; 123, core pile; 200, column; 210, column body; 220, reinforced concrete inner core; 221, connecting anchor bar; 230, steel rib plate; 231, corbel anchor bar; 300, top longitudinal beam; 400, connecting end plate; 500, auxiliary end plate; 600, closed shear key; 700, covering sleeve; 710, welded plate; 800, scissor brace; 900, steel cage skeleton. Detailed Implementation

[0017] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0018] like Figure 1 As shown, a rigid composite pile-column integrated vertical support structure includes: pile 100 and column 200. The pile 100 serves as the foundation component of the entire vertical support system, rooted in the soil layer at the bottom of the foundation pit, providing a stable support foundation for the superstructure. The column 200 serves as the upper support component, connected to the top of the pile 100 and connected to the top longitudinal beam 300. The two are connected to form a complete pile-column integrated vertical support system. During the entire construction process of the foundation pit and its subsequent use, this support system can collaboratively bear vertical loads, horizontal lateral pressures, and reciprocating alternating loads, ensuring the stability of the overall structure of the foundation pit and preventing safety hazards such as collapse and displacement of the foundation pit. like Figure 2 As shown, the pile 100 includes an outer pile 110 and an inner pile 120, which are concentrically arranged to form a rigid composite structure, serving both retaining and load-bearing functions. The outer pile 110, as the retaining structure of the foundation pit, is mainly used to isolate the soil inside and outside the pit and prevent groundwater seepage. It also provides lateral restraint for the inner pile 120, reducing its lateral deformation. The inner pile 120, as the load-bearing core of the entire pile 100, mainly bears vertical axial force, bending moment, and pull-out and anti-slip forces, making it a key component ensuring the bearing capacity of the supporting structure. To achieve precise coaxial arrangement of the inner pile 120 and the outer pile 110 and avoid uneven stress and additional bending moments due to eccentricity, the inner pile 120 is concentrically inserted into the outer pile 110 using static pressure drag reduction technology. This static pressure drag reduction technology effectively reduces the stress during the insertion of the inner pile 120. To reduce resistance and prevent the inner pile 120 from tilting or shifting during the implantation process, and to ensure that the coaxiality of the inner pile 120 and the outer pile 110 meets the design requirements, the problem of additional bending moment caused by eccentricity in traditional pile connections, which leads to structural cracking and instability, is solved from the root. The top of the inner pile 120 extends out to the outer pile 110. The length of the extension is adapted to the connection requirements of the column 200. The extension is fixedly connected to the bottom of the column 200 by welding or other methods to ensure continuous and uniform force transmission between the pile and the column, avoid interruption of force transmission or local stress concentration, realize the coordinated force of the pile 100 and the column 200, and improve the bearing efficiency of the entire support system. The top of the column 200 is provided with a top longitudinal beam 300, which serves as a transverse support component and connects each column 200 to form an overall frame. like Figure 3As shown, the outer wall of the inner pile 120 is provided with continuous spiral grooves 121. The design of the spiral grooves 121 is fully adapted to the stress characteristics of different depths of the foundation pit. The pitch of the grooves is gradually changed, and the grooves adopt a shallow-bottomed arc structure to avoid stress concentration caused by sharp structures. At the same time, it is adapted to the static pressure drag reduction construction process. Specifically, the spiral trajectory of the spiral grooves 121 gradually becomes denser and sparser from top to bottom, and gradually deeper. The upper part of the inner pile 120 corresponds to the upper area of ​​the foundation pit. This area is subject to greater horizontal lateral pressure and is prone to stress concentration. Therefore, the upper part adopts a dense rib shallow groove design. The densely ribbed structure effectively disperses the high lateral pressure from the upper part, reduces stress peaks, and prevents cracking and damage to the upper part of the inner pile 120 due to stress concentration, ensuring the structural integrity of the upper part of the inner pile 120. The lower part of the inner pile 120 corresponds to the lower area of ​​the foundation pit, which needs to bear greater pull-out and anti-slip forces. Therefore, the lower part adopts a sparsely spaced deep trench design. The deep trench structure can achieve strong anchoring with the filling material inside the outer pile 110, greatly improving the pull-out and anti-slip performance of the inner pile 120, ensuring that the vertical pile 100 does not displace or slip under vertical and horizontal loads. To further optimize the stress performance of the inner pile 120, streamlined transition micro-protrusions 122 are provided between adjacent spiral grooves 121. This streamlined transition design eliminates stress sharp angles at the groove joints, preventing cracks caused by stress concentration. Simultaneously, the streamlined structure reduces resistance during the static pressure implantation of the inner pile 120, facilitating construction. The cross-section of the spiral groove 121 is a streamlined arc without sharp angles. This structure not only adapts to the static pressure drag reduction construction process but also allows the filling material (such as cement-soil) within the outer pile 110 to be properly seated during the static pressure implantation of the inner pile 120 into the outer pile 110. Concrete, etc., is continuously and seamlessly squeezed into the spiral groove 121, forming an oblique mechanical tenon-and-mortise locking structure with the spiral groove 121. This locking structure ensures low resistance during the static pressure pile driving process and improves construction efficiency. On the other hand, it achieves anti-slip effect across the entire area of ​​the inner pile 120 and the outer pile 110, making the inner pile 120 and the outer pile 110 tightly connected and synergistically stressed. This effectively solves the common industry problem of easy debonding and slippage at the interface between the inner pile 120 and the outer pile 110 in traditional stiffened composite piles, and improves the overall bearing capacity and stability of the erected pile 100.

[0019] like Figure 3As shown, the inner pile 120 is made by splicing multiple core piles 123, adapting to the support requirements of different foundation pit depths. This breaks the size limitations of traditional one-piece inner piles 120. Based on the actual depth of the foundation pit, the total length of the inner pile 120 can be flexibly adjusted by splicing different numbers of core piles 123, meeting the support requirements of different scenarios such as shallow and deep foundation pits. There is no need to design and manufacture inner piles 120 separately for foundation pits of different depths, improving the versatility and adaptability of the structure. Meanwhile, the column 200 is made by splicing multiple columns 210, adapting to the support requirements of different heights. Both ends of the core pile 123 and column 210 are fixedly equipped with connecting end plates 400. The connecting end plates 400 are made of high-strength steel. The connecting end plates 400 are fixedly connected to the core pile 123 and column 210 by welding. The welding process ensures the connection strength between the connecting end plates 400 and the core pile 123 and column 210, provides a stable force foundation for splicing connection, and enables the splice to smoothly transmit vertical axial force, bending moment and horizontal force, avoids interruption of force transmission or stress concentration at the splice, and ensures the continuity and integrity of the force of the entire inner pile 120 and column 200.

[0020] like Figure 3 As shown, an auxiliary end plate 500 is provided between two adjacent core piles 123. The auxiliary end plate 500 is made of high-strength steel that matches the connecting end plate 400. The size and shape of the auxiliary end plate 500 are adapted to the connecting end plate 400 to ensure that the auxiliary end plate 500 can fit tightly with the connecting end plate 400 of the two adjacent core piles 123. The two adjacent core piles 123 are fixedly connected by the connecting end plate 400 and the auxiliary end plate 500. The specific connection method can be bolt connection, welding connection or a combination of bolt and welding. The auxiliary end plate 500 is sandwiched between the connecting end plates 400 of the two adjacent core piles 123 to form a sandwich-like connection structure, which further enhances the connection strength and integrity of the core pile 123 splice, avoids loosening or slippage at the splice due to force, and ensures the continuity of the overall force of the inner pile 120.

[0021] like Figure 4 and Figure 6As shown, adjacent columns 200 or columns 200 and core piles 123 are fixedly connected by connecting end plates 400. The connecting end plates 400 ensure the reliability of the connection between columns 200 and between columns 200 and core piles 123, achieving smooth force transmission. To further improve the shear resistance of the splice, a closed shear key 600 is provided on the inner wall of the splice. The closed shear key 600 is made of steel and tightly interlocks with the concrete structure of the splice. The closed shear key 600 can effectively bear the main shear force at the splice, preventing shear slippage at the splice and avoiding splice failure due to excessive shear force. At the same time, a covering sleeve 700 is provided on the outer wall of the splice. The covering sleeve 700 is made of steel. Made of high-strength steel, the ring structure can completely wrap the splice gap, providing circumferential restraint and reinforcement, preventing lateral deformation and cracking at the splice, and improving the overall rigidity of the splice. Multiple weld plates 710 are provided on the outer side of the covering sleeve 700, which are evenly distributed around the outer periphery of the covering sleeve 700. One end of the weld plate 710 is welded to the covering sleeve 700, and the other end is welded to the outer wall of the column 200 or core pile 123 at the splice, further fixing the covering sleeve 700 and preventing it from loosening or shifting. At the same time, it enhances the lateral stiffness and fatigue resistance of the splice, avoids cracking of the weld at the splice due to vibration and alternating loads, and ensures the long-term stability of the splice.

[0022] Piles 100 are rigid composite piles, combining the advantages of flexible retaining and rigid load bearing. The inner piles 120 are prestressed high-strength concrete pipe piles, which have the characteristics of high strength and high rigidity and can effectively bear vertical axial force and bending moment. The outer piles 110 are cement-soil mixing piles, which can provide good side friction resistance and confining pressure, restrain the deformation of the inner piles 120, and at the same time play the role of water stop and soil stabilization. The columns 200 are high-strength concrete hollow precast columns, which take into account strength and economy, reduce the self-weight of the structure, and meet the stress requirements of vertical support of the foundation pit.

[0023] like Figure 5As shown, a reinforced concrete core 220 is provided inside the top of the column 200. The reinforced concrete core 220 is made of steel bars and concrete. The steel bars are high-strength longitudinal bars and stirrups, and the concrete is high-strength concrete. The reinforced concrete core 220 is tightly integrated with the precast pipe wall of the column 200 to form a synergistic load-bearing structure. The reinforced concrete core 220 can significantly improve the stiffness, shear resistance, and bending resistance of the top of the column 200. Because the top of the column 200 is connected to the top longitudinal beam 300, it is a critical node for load transfer and is prone to stress concentration. The reinforced concrete core 220 can effectively disperse stress and prevent stress concentration at the top of the column 200. To prevent cracks and damage, and to ensure the structural integrity of the top of the column 200, a connecting anchor bar 221 is installed at the top of the column 200. The connecting anchor bar 221 is made of high-strength threaded steel. One end of the connecting anchor bar 221 is pre-embedded in the reinforced concrete core 220 at the top of the column 200, and the other end is anchored into the top longitudinal beam 300. The concrete bond force achieves a firm anchorage between the column 200 and the top longitudinal beam 300, ensuring smooth force transmission between the column 200 and the top longitudinal beam 300, preventing loosening or separation, and making the column 200 and the top longitudinal beam 300 form an integral load-bearing system to jointly bear various loads and improve the stability of the entire support frame.

[0024] like Figure 5 and Figure 6 As shown, multiple steel ribs 230 are circumferentially arranged on the outer wall of the top of the column 200. The steel ribs 230 are made of high-strength steel and have a triangular or rectangular structure. They serve to strengthen the structural strength of the top of the column 200, effectively disperse the stress at the top of the column 200, and prevent local deformation and cracking at the top of the column 200. The top of the steel ribs 230 is provided with corbel anchor bars 231. The corbel anchor bars 231 are made of high-strength threaded steel. One end of the corbel anchor bars 231 is welded and fixed to the steel ribs 230, and the other end is anchored into the interior of the top longitudinal beam 300. They work together with the connecting anchor bars 221 at the top of the column 200 to form a double anchoring structure, which further improves the connection reliability between the column 200 and the top longitudinal beam 300, enhances the shear and bending resistance of the connection node, effectively resists the horizontal force and bending moment transmitted by the top longitudinal beam 300, avoids shear failure and bending deformation of the connection node, achieves stable connection between the column 200 and the top longitudinal beam 300, and ensures the stress safety of the entire support frame.

[0025] like Figure 3 and Figure 5As shown, both the inner pile 120 and the column 200 are equipped with a steel cage 900. The steel cage 900 is one of the core load-bearing components of the inner pile 120 and the column 200, used to enhance the structural strength, integrity, and crack resistance of the inner pile 120 and the column 200. The steel cage 900 consists of longitudinal main bars and stirrups. The longitudinal main bars are made of high-strength threaded steel and are evenly distributed on the outer periphery of the steel cage 900. They mainly bear the main tensile and compressive forces on the structure, ensuring that the inner pile 120 and the column 200 can withstand various loads. The stirrups are made of round steel or threaded steel and are wrapped in a ring around the outside of the longitudinal main bars and welded to the longitudinal main bars. The stirrups can effectively restrain the longitudinal main bars and prevent them from buckling or deforming during the stress process. The shape enhances the overall integrity of the steel cage 900, thereby improving the overall structural performance of the inner pile 120 and the column 200. The steel cage 900 of the inner pile 120 is tightly integrated with the concrete of the inner pile 120, and the concrete encapsulates the steel cage 900 to form a synergistic load-bearing structure. This can significantly improve the bearing capacity, crack resistance and durability of the inner pile 120, and prevent the inner pile 120 from cracking or breaking due to excessive stress. The steel cage 900 of the column 200 works in conjunction with the cast-in-place reinforced concrete core 220 and the precast pipe wall of the column 200. The three are tightly integrated and synergistically bear the load transmitted by the top longitudinal beam 300 and smoothly transfer the load to the pile 100.

[0026] The connecting end plates 400 are fixedly connected by mechanical interlocking and welding, forming a double connection structure that balances convenience and reliability. The mechanical interlocking structure uses a convex-concave fit, with bosses and grooves on the connecting end plates 400 or auxiliary end plates 500. The precise fit of the bosses and grooves achieves initial positioning and anti-slip properties at the joint. This mechanical interlocking structure allows for rapid component positioning, facilitating subsequent welding, and also bears some horizontal and shear forces, preventing relative slippage at the joint. The welding connection adopts full welding or intermittent welding to fully weld the gaps between the connecting end plates 400 and between the connecting end plate 400 and the auxiliary end plate 500, further enhancing the splicing strength and ensuring the integrity and reliability of the splice. This dual connection method combines the positioning and anti-slip advantages of mechanical interlocking with the high strength advantage of welding connection, ensuring that the splice is firmly connected, avoiding loosening or separation at the splice, ensuring the stress safety of the entire support structure, enabling the splice to smoothly transmit various loads, and ensuring the overall stress continuity of the inner pile 120 and column 200.

[0027] like Figure 1As shown, multiple sets of columns 200 are installed under the top longitudinal beam 300. These columns 200 are evenly distributed below the top longitudinal beam 300. The number and spacing of the columns 200 are rationally set according to the length of the top longitudinal beam 300, the load size, and the scale of the foundation pit. This ensures that the multiple sets of columns 200 can evenly distribute the load transmitted by the top longitudinal beam 300, avoiding overload, deformation, and instability problems caused by excessive stress on a single column 200. Horizontal stability is ensured by scissor bracing 800 between adjacent sets of columns 200. The scissor bracing 800 is made of high-strength steel and is arranged in a crisscross pattern. Both ends are welded and fixed to the side walls of the two adjacent sets of columns 200, or fixedly connected by connectors, to ensure reliable connection between the scissor brace 800 and the columns 200. The scissor brace 800 and multiple sets of columns 200 together form a horizontal support system. This horizontal support system can effectively resist the horizontal lateral pressure of the foundation pit and the reciprocating alternating load, prevent the columns 200 from horizontally shifting or becoming unstable under the action of horizontal force, and at the same time enhance the horizontal stiffness and overall stability of the entire vertical support structure of the foundation pit, avoid safety hazards such as overall tilting and collapse of the support structure, and ensure the safety of the foundation pit construction and use process.

[0028] The foregoing has shown and described the basic principles, main features, and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The embodiments and descriptions in the specification are merely illustrative of the principles of the invention. Various changes and modifications can be made to the invention without departing from its spirit and scope, and all such changes and modifications fall within the scope of the claimed invention.

Claims

1. A rigid composite pile-column integrated vertical support structure, characterized in that, include: Piles (100) and columns (200); The pile (100) includes an outer pile (110) and an inner pile (120). The inner pile (120) is inserted concentrically into the outer pile (110) using static pressure drag reduction technology. Its top extends out of the outer pile (110) and is fixedly connected to the bottom of the column (200). The top of the column (200) is provided with a top longitudinal beam (300). The outer wall of the inner pile (120) is provided with a spiral groove (121). The pitch of the spiral groove (121) gradually changes, and it is a shallow bottom arc groove. The spiral trajectory of the spiral groove (121) gradually becomes denser and shallower from top to bottom. There is a transition micro-protrusion rib (122) between adjacent spiral grooves (121). The cross section of the spiral groove (121) is a streamlined arc without sharp corners. When the static pressure is implanted, the filling material in the outer pile (110) is continuously squeezed into the spiral groove (121) to form an oblique mechanical tenon lock, which takes into account both the low pile resistance and the overall anti-slip.

2. The integrated vertical support structure for reinforced composite piles according to claim 1, characterized in that, The inner pile (120) is made by splicing multiple core piles (123), and the column (200) is made by splicing multiple column bodies (210). Both ends of the core pile (123) and the column body (210) are fixedly provided with connecting end plates (400).

3. The integrated vertical support structure for reinforced composite piles according to claim 2, characterized in that, An auxiliary end plate (500) is provided between two adjacent core piles (123), and the two adjacent core piles (123) are fixedly connected by a connecting end plate (400) and an auxiliary end plate (500).

4. The integrated vertical support structure for reinforced composite piles according to claim 3, characterized in that, Two adjacent columns (200) are fixedly connected by a connecting end plate (400) or a column (200) and a core pile (123). A closed shear key (600) is provided on the inner wall of the splice and a covering sleeve (700) is provided on the outer wall. Multiple welding plates (710) are provided on the outer side of the covering sleeve (700).

5. The integrated vertical support structure for reinforced composite piles according to claim 1, characterized in that, The pile (100) is a rigid composite pile, the inner pile (120) is a prestressed high-strength concrete pipe pile, the outer pile (110) is a cement-soil mixing pile, and the column (200) is a high-strength concrete hollow precast column.

6. The integrated vertical support structure for reinforced composite piles according to claim 1, characterized in that, The top of the column (200) is provided with a reinforced concrete core (220), and a connecting anchor bar (221) is provided at its top. The connecting anchor bar (221) is anchored into the top longitudinal beam (300).

7. The integrated vertical support structure for reinforced composite piles according to claim 1, characterized in that, The outer wall of the top of the column (200) is provided with a plurality of steel ribs (230) in a circumferential manner. The top of the steel ribs (230) is provided with corbel anchor bars (231), which are anchored into the interior of the top longitudinal beam (300).

8. The integrated vertical support structure for reinforced composite piles according to claim 1, characterized in that, The inner pile (120) and the column (200) are both equipped with a steel cage (900).

9. The integrated vertical support structure for a rigid composite pile according to claim 3, characterized in that, The connecting end plates (400) are fixedly connected to each other or to the auxiliary end plate (500) by mechanical interlocking and welding.

10. The integrated vertical support structure for reinforced composite piles according to claim 1, characterized in that, Multiple sets of columns (200) are provided under the top longitudinal beam (300), and scissor bracing (800) is provided between adjacent sets of columns (200) to ensure horizontal stability.

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