CFG pile foundation structure for improving foundation bearing capacity and construction method

Abstract

The invention discloses a CFG pile foundation structure capable of improving foundation bearing capacity and a construction method, and relates to the technical field of pile foundation construction.The CFG pile foundation structure comprises a plurality of GFG pile bodies arranged in a foundation, pile foundation holes are formed in the positions, located on the foundation, of the CFG pile bodies, first supporting assemblies are arranged on the side walls of the CFG pile bodies, the first supporting assemblies make contact with the inner side walls of the pile foundation holes, and the second supporting assemblies make contact with the outer side walls of the pile foundation holes. Pile cap formworks are arranged at the ends, away from the pile foundation holes, of the CFG pile bodies, pile caps are poured in the pile cap formworks and located above the CFG pile bodies, second supporting assemblies are arranged at the ends, away from the CFG pile bodies, of the pile caps, the second supporting assemblies are located on the adjacent CFG pile bodies and connected with the adjacent CFG pile bodies, and fixing assemblies are arranged on the sides, close to the pile caps, of the supporting assemblies. The pile bodies are supported by the first supporting assemblies after pouring of the CFG pile bodies is completed, the bearing area of a foundation is increased through mutual connection of the second supporting assemblies arranged on the adjacent CFG pile bodies, the CFG piles can be evenly stressed, and the bearing capacity of the foundation is improved.

Description

Technical Field

[0001] The present application relates to the technical field of pile foundation construction, and in particular to a CFG pile foundation structure and a construction method for improving the bearing capacity of a foundation. Background Art

[0002] CFG piles are made by pouring a certain proportion of cement, fly ash, crushed stone and stone chips on site. They have relatively good bonding strength, obvious load effect and good construction efficiency. Therefore, they have become one of the commonly used foundation treatment methods for high-speed railway roadbeds in recent years.

[0003] The pile driver uses a long spiral to drill holes. It can pump concrete through the drill rod and complete the CFG pile construction. It can drill holes with one machine at a time. It can also be used for dry drilling, grouting replacement, and deep mixing after changing the drill tool. After the operator pours the CFG pile, the connection between the CFG pile and the foundation is subject to great force. Therefore, after the CFG pile is used for a long time, the pressure between the CFG pile and the foundation will cause the CFG pile to be dislocated, causing the CFG pile to deform, thereby reducing the bearing capacity of the foundation.

[0004] With respect to the above-mentioned related technologies, the inventors believe that after the CFG piles are used for a long time, the pressure between the CFG piles and the foundation will cause the CFG piles to be misaligned, thereby reducing the bearing capacity of the foundation. Summary of the invention

[0005] The purpose of the present application is to provide a CFG pile foundation structure and a construction method for improving the bearing capacity of the foundation, so as to improve the problem that after the CFG piles are used for a long time, the pressure between the CFG piles and the foundation will cause the CFG piles to be misaligned, thereby reducing the bearing capacity of the foundation.

[0006] The present application provides a CFG pile foundation structure and construction method for improving foundation bearing capacity, which adopts the following technical solutions: A CFG pile foundation structure for improving the bearing capacity of the foundation comprises a plurality of CFG pile bodies arranged in the foundation, wherein the CFG pile bodies are located at positions of the foundation and are provided with pile foundation holes, a support component 1 is arranged in the foundation of the side walls of the CFG pile bodies, the support component 1 corresponds to the pile foundation hole, a pile cap template is arranged at one end of the CFG pile body away from the pile foundation hole, a pile cap is arranged above the CFG pile body in the pile cap template, a support component 2 is arranged at one end of the pile cap away from the CFG pile body, the support component 2 is located on adjacent CFG pile bodies and are connected to each other, and a fixing component is arranged on a side of the support component 2 close to the pile cap.

[0007] By adopting the above technical scheme, a pile foundation hole is opened on the foundation by a drilling rig, and the CFG pile body arranged in the pile foundation hole is cast, and the CFG pile body is supported by a supporting component 1 arranged in the foundation to keep the CFG pile body vertical, and the pile cap above the CFG pile body is constructed by a pile cap template installed on the CFG pile body, and the supporting component 2 is connected with the fixing component arranged on the CFG pile body, and the supporting component 2 is fixed, and the supporting component 2 is connected with the pile cap to increase the force-bearing area of ​​the CFG pile body, and the CFG pile body is evenly stressed by the supporting component 2, so as to prevent the CFG pile body from being dislocated and increase the bearing capacity of the foundation.

[0008] Optionally, a pile foundation groove is provided on the inner wall of the pile foundation hole below the CFG pile body, and the pile foundation groove corresponds to the outer wall of the CFG pile body close to one end of the pile foundation groove. The supporting assembly includes a supporting pipe member arranged in the foundation, and the supporting pipe member is in contact with the inner wall of the pile foundation hole. The supporting pipe member has a side wall that fits the outer wall of the CFG pile body, and the outer wall of the supporting pipe member is provided with a supporting rod inserted in the foundation, and the end of the supporting pipe member away from the pile foundation hole is in contact with the pile cap template.

[0009] By adopting the above technical scheme, the pile foundation groove is set by expanding the hole below the pile foundation hole, so that the contact area between the bottom of the cast bending and sinking fixed CFG pile body and the foundation is large, so the bearing capacity of the CFG pile body is improved, and the supporting pipe is driven into the foundation. The supporting rods set on the outer wall of the supporting pipe are used to keep the supporting pipe vertical in the foundation, and the pile foundation hole is excavated by the supporting pipe, so that the CFG pile body cast in the pile foundation hole is kept vertical to the horizontal foundation, so as to reduce the deviation of the CFG pile body and the possibility of reducing the bearing capacity of the CFG pile body. At the same time, the supporting pipe supports the cast CFG pile body to prevent the CFG pile body from tilting under the pressure of the foundation and damaging the CFG pile body.

[0010] Optionally, the pile cap template includes a fixed bottom template arranged on the CFG pile body, the fixed bottom template is in contact with the supporting pipe, a connecting groove 1 is provided on the fixed bottom template, an inner side wall of the connecting groove 1 is fitted with an outer side wall of the CFG pile body, a pile cap side template is arranged on the side of the fixed bottom template away from the CFG pile body, the fixed bottom template and the pile cap side template are arranged around the outer side wall of the CFG pile body to form the pile cap template, and adjacent side walls of the fixed bottom template are fitted with each other.

[0011] By adopting the above technical scheme, a connecting groove that fits with the side wall of the CFG pile body is opened on the fixed bottom mold, the fixed bottom mold is set around the CFG pile body and fixed on the CFG pile body, and a pile cap side mold is set on the fixed bottom mold, which is set around the CFG pile body together with the fixed bottom mold to form a pile cap template, which is convenient for demoulding after the pile cap is poured.

[0012] Optionally, a connecting plate is provided at one end of the pile cap side formwork, and a connecting groove 2 is opened at the other end of the pile cap side formwork, the connecting plates on the adjacent pile cap side formworks are fitted with the inner wall of the connecting groove 2, and a fixing clamp is provided on the outer wall of the pile cap side formwork, and the inner wall of the fixing clamp is fitted with the outer wall of the pile cap side formwork.

[0013] By adopting the above technical scheme, the pile cap side forms are connected and fixed to each other when they are set around the CFG pile body through the connection groove 2 opened at one end of the pile cap side form and the connection plate set at the other end, so as to prevent leakage when pouring the pile cap. The pile cap formwork is fixed by connecting it to the outer wall of the pile cap side formwork with a fixing clamp ring, so as to prevent the pile cap formwork from being disconnected under the action of concrete when pouring the pile cap, thereby affecting the pouring of the pile cap.

[0014] Optionally, an isolating piece is provided in the connecting groove 1 opened on the fixed bottom mold, and the isolating piece is fitted with the side wall of the CFG pile body. The isolating piece 1 is extended near one end of the supporting pipe and is fitted with the gap between adjacent fixed bottom molds.

[0015] By adopting the above technical solution, the gap between the CFG pile body and the fixed bottom formwork arranged around the CFG pile body is isolated by means of an isolating piece arranged in a connecting groove 1 of the fixed bottom formwork, and the isolating piece is extended at one end close to the supporting pipe fitting and fits with the gap at the position where the fixed bottom formworks are connected to each other, thereby sealing and isolating the gap between the fixed bottom formworks, preventing the pile cap from leaking during pouring, and making it difficult to separate the pile cap template from the pile cap.

[0016] Optionally, a connecting groove three is provided on the side of the pile cap side form away from the CFG pile body, and the connecting groove three is in contact with the supporting component two. The supporting component two includes a supporting frame one arranged on the pile cap, and a supporting frame two is arranged on the supporting frame one in horizontal and vertical directions. The side walls of the supporting frame one and the supporting frame two are in contact with the connecting groove three, and the side of the supporting frame one and the supporting frame two away from the CFG pile body are flush with the side of the pile cap side form away from the CFG pile body.

[0017] By adopting the above technical solution, support frame one and support frame two are arranged in connection groove three opened on the pile cap side formwork, and the support frame is supported and fixed by the pile cap formwork, so that the support frame is connected and fixed to the pile cap when the pile cap is cast, thereby increasing the contact area of ​​the pile cap, and by making the support frame flush with the pile cap side formwork, the cast pile cap and the support frame are subjected to force together, thereby preventing the support frame from being damaged by the force alone.

[0018] Optionally, the side walls of the support frame 1 and the support frame 2 are provided with fixing grooves, and connecting rods are provided in the fixing grooves. The connecting rods are connected to the pile cap when the pile cap is cast, and the support frame 1 and the support frame 2 are connected to each other at one end close to each other on the adjacent CFG pile bodies.

[0019] By adopting the above technical solution, connecting rods are inserted into the fixing grooves on the support frame one and the support frame two, so that the pile cap is connected and fixed to the connecting rods during pouring, so as to prevent the support frame from being separated from the pile cap and causing damage to the pile cap. The pile cap is reinforced by the connecting rods, so as to improve the bearing capacity of the pile cap and prevent the pile cap from being damaged under the pressure of the foundation. The support frames on adjacent CFG pile bodies are connected and fixed to each other, so that the CFG pile bodies arranged on the foundation are evenly stressed, and the possibility of dislocation of the CFG pile bodies is reduced.

[0020] Optionally, the fixing assembly includes a fixing rod arranged on one side of the support frame 1 and the support frame 2 close to the CFG pile body, the fixing rod is arranged and distributed along the direction of the support frame 1 and the support frame 2, a positioning groove 1 which fits with the fixing rod is provided on the CFG body, and a positioning groove 2 is provided on the support frame 1 and the support frame 2, and the inner side wall of the positioning groove 2 fits with the fixing rod.

[0021] By adopting the above technical scheme, a positioning groove 1 is opened on the CFG pile body for inserting a fixing rod, which is connected to the support frame 1 and the support frame 2 set on the pile cap template through the fixing rod, and the support frame 1 and the support frame 2 are fixed, so that the support frame 1 and the support frame 2 are connected and fixed to the pile cap after the pile cap is cast, so as to prevent the support frame 1 and the support frame 2 from being separated from the pile cap after the pile cap is cast, thereby preventing the support frame 1 and the support frame 2 from being separated from the pile cap after the pile cap is cast, thereby affecting the CFG pile body structure.

[0022] A construction method of a CFG pile foundation structure for improving foundation bearing capacity comprises the following steps: Level the foundation, drive the supporting pipe of the supporting assembly 1 into the foundation, move the drilling rig to the designated location, and excavate the pile foundation hole on the foundation to make the depth of the pile foundation hole reach the designed depth; The bottom of the pile foundation hole is enlarged to open the pile foundation groove, and then the drill rod of the drilling rig stops rotating, and concrete is pumped into the pile foundation hole through the drill rod of the drilling rig to cast the CFG pile body; After the CFG pile body is solidified, the soil between the piles at the position above the pile foundation hole is excavated to expose a part of the top of the upper CFG pile body, and the pile head of the extra part of the CFG pile body is cut to make the CFG pile body at the same height; Then, the pile cap formwork is erected on the CFG pile body, the pile cap is poured, and the soil between the piles is backfilled.

[0023] The construction of CFG pile foundation structure includes the following steps: After the supporting pipe is driven into the foundation, the supporting rod of the outer wall of the supporting pipe is also driven into the foundation to support the supporting pipe. The drill bit on the drill rod of the drilling rig corresponds to the inner wall of the supporting pipe to excavate the pile foundation hole of the foundation. After reaching the specified depth, the drilling rig expands the pile foundation groove below the pile foundation hole. After the drill rod of the drilling rig stops rotating, concrete is pumped from the hollow drill rod of the drilling rig into the bottom of the pile foundation hole and the pile foundation groove. Then the drilling rig slowly lifts the drill rod to make the concrete fall into the pile foundation hole and the pile foundation groove, so that the CFG pile body is cast and formed; After the pile head of the CFG pile body is cut, a positioning groove 1 is opened above the CFG pile body, and a fixing rod is inserted into the positioning groove 1 above the CFG pile body, and connected with the supporting frame 1 and the supporting frame 2 installed on the pile cap template; On the CFG pile body, the fixed bottom formwork and the pile cap side cap are spliced ​​around the side wall of the CFG pile body, and the spliced ​​pile cap template is fixed with a fixed clamp. The support frame 1 and the support frame 2 are installed on the pile cap template, flush with the pile cap template, and the support frame 1 and the support frame 2 are connected to the fixed rod inserted on the CFG pile body. The support frame 1 and the support frame 2 on adjacent CFG pile bodies are welded together. The pile cap templates on adjacent CFG pile bodies are at the same height, and then the pile cap is poured.

[0024] In summary, the present application includes at least one of the following beneficial technical effects: 1. Through the pile foundation groove set by the expansion hole below the pile foundation hole, the contact area between the bottom of the cast bending and sinking fixed CFG pile body and the foundation is large, which improves the bearing capacity of the CFG pile body. The supporting pipe is set in the foundation, and the supporting rod set on the outer wall of the supporting pipe is used to keep the supporting pipe vertical in the foundation. The pile foundation hole is excavated through the supporting pipe, so that the CFG pile body cast in the pile foundation hole is kept vertical with the horizontal foundation, which reduces the deviation of the CFG pile body and the possibility of reducing the bearing capacity of the CFG pile body. At the same time, the supporting pipe supports the cast CFG pile body to prevent the CFG pile body from tilting under the pressure of the foundation, which may damage the CFG pile body. 2. The fixed bottom formwork is set around the CFG pile body and then fixed on the CFG pile body. A pile cap side formwork is set on the fixed bottom formwork, and the pile cap formwork is set around the CFG pile body together with the fixed bottom formwork to facilitate demoulding after the pile cap is poured. The pile cap side forms are connected and fixed to each other when they are set around the CFG pile body through the connection groove 2 opened at one end of the pile cap side formwork and the connection plate set at the other end to prevent leakage when pouring the pile cap. The fixed clamp ring is connected to the outer wall of the pile cap side formwork to fix the formed pile cap formwork to prevent the pile cap formwork from being disconnected under the action of concrete when pouring the pile cap, which affects the pouring of the pile cap. 3. Set the support frame 1 and the support frame 2 in the connection groove 3 opened on the pile cap side formwork, support and fix the support frame through the pile cap formwork, so that the support frame is connected and fixed with the pile cap when the pile cap is poured, thereby increasing the contact area of ​​the pile cap. By making the support frame flush with the pile cap side formwork, the poured pile cap and the support frame are stressed together, preventing the support frame from being damaged by the force alone. The support frames on adjacent CFG pile bodies are connected and fixed to each other, so that the CFG pile bodies arranged on the foundation are evenly stressed, thereby reducing the possibility of misalignment of the CFG pile bodies. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is an overall schematic diagram of a CFG pile foundation structure for improving the bearing capacity of the foundation.

[0026] Figure 2 It is a partial schematic diagram of the pile foundation structure.

[0027] Figure 3 It is a partial cross-sectional view of the pile foundation structure.

[0028] Figure 4 yes Figure 3 A partial enlarged view of middle A.

[0029] In the figure, 1, foundation; 12, pile foundation hole; 13, pile foundation groove; 2, CFG pile body; 21, positioning groove one; 3, support component one; 31, support pipe fitting; 32, support rod; 4, pile cap template; 41, fixed bottom template; 411, connecting groove one; 42, pile cap side template; 421, connecting plate; 422, connecting groove two; 423, connecting groove three; 43, fixing clamp; 44, spacer; 5, pile cap; 6, support component two; 61, support frame one; 611, fixed groove; 612, positioning groove two; 62, support frame two; 63, connecting rod; 7, fixing component; 71, fixing rod. DETAILED DESCRIPTION

[0030] The following is combined with Figure 1 -Attached Figure 4 , further details of this application are given.

[0031] Embodiment 1 A CFG pile foundation structure that improves the bearing capacity of the foundation, referring to Figure 1 and Figure 3, including a metal support pipe 31 vertically driven into the foundation 1, a metal support rod 32 is welded on the outer wall of the support pipe 31 and driven into the foundation 1 together with the support pipe 31, and a pile foundation hole 12 is excavated on the foundation 1 by aligning a drilling rig with the inner circle of the support pipe 31, the inner wall of the pile foundation hole 12 is fitted with the support pipe 31, so that the inner wall of the pile foundation hole 12 is communicated with the inner wall of the support pipe 31, and a pile foundation groove 13 is formed at the bottom of the pile foundation hole 12, and a CFG pile body 2 is cast and formed in the pile foundation hole 12, the pile foundation groove 13 and the inner wall of the support pipe 31, so as to increase the contact area between the bottom of the CFG pile body 2 and the foundation 1 and improve the bearing capacity of the CFG pile body 2.

[0032] Reference Figures 2 to 4 A fixed bottom mold 41 is installed at one end of the CFG pile body 2 away from the pile foundation hole 12, and a connecting groove 1 411 is provided on the fixed bottom mold 41 to fit with the side wall of the CFG pile body 2. A pile cap side mold 42 is integrally formed on the fixed bottom mold 41, and a connecting groove 2 422 is provided on one side of the pile cap side mold 42. A connecting plate 421 is integrally formed at the other end of the pile cap side mold 42, and the connecting plates 421 on the adjacent pile cap side molds 42 fit with the inner side walls of the connecting groove 2 422; the fixed bottom mold 41 and the pile cap side mold 42 are spliced ​​around the side wall of the CFG pile body 2, The pile cap template 4 is composed, and a metal fixing clamp 43 is sleeved on the outer side wall of the pile cap side template 42 to fix the pile cap template 4 to prevent the pile cap template 4 from separating during the pouring process; an isolation member 44 is installed on the inner side wall of the connecting groove 411 of the fixed bottom template 41, and the isolation member 44 is a rubber isolation gasket. The isolation member 44 contacts the end of the supporting pipe 31 away from the pile foundation hole 12, and the isolation member 44 is extended from the end close to the supporting pipe 31 to fit the gap between the fixed bottom template 41 to prevent leakage caused by the gap of the fixed bottom template 41 when pouring the pile cap 5.

[0033] Reference Figures 2 to 4A connection groove 3 423 is provided on the pile cap side form 42 of the pile cap formwork 4, and the integrally formed metal support frame 1 61 and support frame 2 62 are installed on the pile cap formwork 4, so that the side walls of the support frame 1 61 and support frame 2 62 are fitted with the connection groove 3 423 spliced ​​with each other on the pile cap formwork 4, and the support frame 1 61 and support frame 2 62 on the adjacent CFG pile body 2 are welded and connected to each other; a fixing groove 611 is provided on the support frame 1 61 and support frame 2 62, and a metal connecting rod 63 is inserted into the fixing groove 611, so that the connecting rod 63 is fixed to the pile cap 5 when pouring. Together with the support frame 1 61 and the support frame 2 62, it is fixed to the pile cap 5; a positioning groove 21 is opened on the end of the CFG pile body 2 away from the pile foundation hole 12, and the steel bar serving as the fixing rod 71 is inserted into the positioning groove 21; a positioning groove 212 corresponding to the positioning groove 21 is opened on the support frame 1 61 and the support frame 2 62, so that the fixing rod 71 is connected and fixed to the support frame 1 61 and the support frame 2 through the positioning groove 612, and a release agent is sprayed on the inner wall of the pile cap template 4, and the pile cap 5 is cast, so that the pile cap 5 is connected and fixed to the fixing rod 71 and the support frame.

[0034] Embodiment 2 S100, leveling the foundation 1, driving the support pipe 31 of the support assembly 1 3 into the foundation 1, moving the drilling rig to a designated position, and excavating the pile foundation hole 12 on the foundation 1, so that the depth of the pile foundation hole 12 reaches the designed depth; S110, after the support pipe 31 is driven into the foundation 1, the support rod 32 of the outer wall of the support pipe 31 is also driven into the foundation 1 to support the support pipe 31, and the drill bit on the drill rod of the drilling rig corresponds to the inner wall of the support pipe 31, and the pile foundation hole 12 of the foundation 1 is excavated. After reaching the specified depth, the drilling rig expands the pile foundation groove 13 below the pile foundation hole 12; S200, expanding the bottom of the pile foundation hole 12 to open a pile foundation groove 13, then stopping the drill rod of the drilling rig to pump concrete into the pile foundation hole 12 through the drill rod of the drilling rig to cast the CFG pile body 2; S210, after the drill rod of the drilling rig stops rotating, concrete is pumped from the hollow drill rod of the drilling rig into the bottom of the pile foundation hole 12 and the pile foundation groove 13, and then the drilling rig slowly lifts the drill rod to make the concrete fall into the pile foundation hole 12 and the pile foundation groove 13, so that the CFG pile body 2 is cast and formed; S300, after the CFG pile body 2 is solidified, the soil between the piles at the position above the pile foundation hole 12 of the foundation 1 is excavated to expose a portion of the top of the upper CFG pile body 2, and the pile head of the excess part of the CFG pile body 2 is cut to make the CFG pile body 2 at the same height; S400, then set up the pile cap template 4 on the CFG pile body 2, cast the pile cap 5, and backfill the soil between the piles; S410, after the pile head of the CFG pile body 2 is cut, a positioning groove 21 is opened above the CFG pile body 2, and a fixing rod 71 is inserted into the positioning groove 21 above the CFG pile body 2, and connected to the supporting frame 1 61 and the supporting frame 2 62 installed on the pile cap template 4; S420, on the CFG pile body 2, the fixed bottom formwork 41 and the side cap of the pile cap 5 are spliced ​​around the side wall of the CFG pile body 2, and the spliced ​​pile cap template 4 is fixed with a fixed clamp 43, and the support frame 1 61 and the support frame 2 62 are installed on the pile cap template 4, flush with the pile cap template 4, and the support frame 1 61 and the support frame 2 62 are connected to the fixed rod 71 inserted on the CFG pile body 2, and the support frames 1 61 and the support frames 2 62 on adjacent CFG pile bodies 2 are welded together, and the pile cap templates 4 on adjacent CFG pile bodies 2 are at the same height, and then the pile cap 5 is poured.

[0035] The implementation principle of the embodiment of the present application is: The foundation 1 is leveled, the supporting pipe 31 is driven into the foundation 1, the drilling rig is driven to the designated position, the pile foundation hole 12 on the foundation 1 is excavated, and the depth of the pile foundation hole 12 reaches the designed depth. The drill bit on the drilling rig drill rod corresponds to the inner wall of the supporting pipe 31, and the pile foundation hole 12 of the foundation 1 is excavated. After reaching the designated depth, the drilling rig expands the bottom of the pile foundation hole 12 to form a pile foundation groove 13; finally, the drilling rod of the drilling rig stops rotating, and concrete is pumped from the hollow drilling rod of the drilling rig into the bottom of the pile foundation hole 12 and the pile foundation groove 13. Then, the drilling rig slowly lifts the drilling rod to make the concrete fall into the pile foundation hole 12 and the pile foundation groove 13, so that the CFG pile body 2 is cast and formed, so that the contact area between the bottom of the CFG pile body 2 and the foundation 1 is increased, and the bearing capacity of the CFG pile body 2 is improved; the soil between the piles of the foundation 1 located above the pile foundation hole 12 is excavated to expose the top of the upper part of the CFG pile body 2 A part is pulled out, and the pile head of the CFG pile body 2 is cut so that the CFG pile body 2 is at the same height; a positioning groove 21 is opened above the CFG pile body 2, and a fixing rod 71 is inserted into the positioning groove 21 above the CFG pile body 2, and a fixed bottom mold 41 and a pile cap 5 side cap are spliced ​​around the side wall of the CFG pile body 2 on the CFG pile body 2 to form a pile cap template 4, and a support frame 61 and a support frame 62 are installed in the connecting groove 3 423 on the pile cap template 4, flush with the pile cap template 4, and the support frame 61 and the support frame 62 are connected to the fixing rod 71 inserted on the CFG pile body 2, and the support frames 61 and the support frames 62 on adjacent CFG pile bodies 2 are welded together, and the pile cap templates 4 on adjacent CFG pile bodies 2 are at the same height, and then the pile cap 5 is poured, so that the pile cap 5 is connected and fixed to the support frame and the fixing rod 71, and the soil between the piles is backfilled. By means of the pile cap 5 and the support frame arranged on the CFG pile body 2 , the force bearing area of ​​the CFG pile is increased, the force on the CFG pile is evenly applied, the possibility of misalignment of the CFG pile is reduced, and the bearing capacity of the foundation 1 is increased.

[0036] The embodiments of this specific implementation are all preferred embodiments of the present application, and are not intended to limit the protection scope of the present application. The same components are represented by the same figure marks. Therefore, any equivalent changes made based on the structure, shape, and principle of the present application should be included in the protection scope of the present application.

Claims

1. A CFG pile foundation structure for improving the bearing capacity of a foundation, comprising a plurality of CFG pile bodies arranged in a foundation (1), characterized in that: The CFG pile body (2) is located at a position on the foundation (1) and is provided with a pile foundation hole (12); a support assembly (3) is provided in the foundation (1) on the side wall of the CFG pile body (2); the support assembly (3) corresponds to the pile foundation hole (12); a pile cap template (4) is provided at one end of the CFG pile body (2) away from the pile foundation hole (12); a pile cap (5) is provided in the pile cap template (4) above the CFG pile body (2); a support assembly (6) is provided at one end of the pile cap (5) away from the CFG pile body (2); the support assembly (6) is located on adjacent CFG pile bodies (2) and is connected to each other; a fixing assembly (7) is provided on one side of the support assembly (6) close to the pile cap (5).

2. A CFG pile foundation structure for improving foundation bearing capacity according to claim 1, characterized in that: The inner wall of the pile foundation hole (12) located below the CFG pile body (2) is provided with a pile foundation groove (13), and the pile foundation groove (13) corresponds to the outer wall of the CFG pile body (2) close to one end of the pile foundation groove (13). The support assembly (3) comprises a support pipe (31) arranged in the foundation (1), and the support pipe (31) is in contact with the inner wall of the pile foundation hole (12). The side wall of the support pipe (31) is in contact with the outer wall of the CFG pile body (2). The outer wall of the support pipe (31) is provided with a support rod (32) inserted in the foundation (1), and the end of the support pipe (31) away from the pile foundation hole (12) is in contact with the pile cap template (4).

3. A CFG pile foundation structure for improving foundation bearing capacity according to claim 2, characterized in that: The pile cap template (4) comprises a fixed bottom template (41) arranged on the CFG pile body (2), the fixed bottom template (41) being in contact with the supporting pipe (31), a connecting groove (411) being provided on the fixed bottom template (41), an inner side wall of the connecting groove (411) being in contact with an outer side wall of the CFG pile body (2), a pile cap side template (42) being arranged on a side of the fixed bottom template (41) away from the CFG pile body (2), the fixed bottom template (41) and the pile cap side template (42) being arranged around the outer side wall of the CFG pile body (2) to form the pile cap template (4), and adjacent side walls of the fixed bottom template (41) being in contact with each other.

4. A CFG pile foundation structure for improving foundation bearing capacity according to claim 3, characterized in that: A connecting plate (421) is provided at one end of the pile cap side form (42), and a second connecting groove (422) is provided at the other end of the pile cap side form (42). The connecting plates (421) on the adjacent pile cap side forms (42) are fitted with the inner side walls of the second connecting grooves (422). A fixing snap ring (43) is provided on the outer side wall of the pile cap side form (42), and the inner side wall of the fixing snap ring (43) is fitted with the outer side wall of the pile cap side form (42).

5. The CFG pile foundation structure for improving foundation bearing capacity according to claim 3, characterized in that: An isolating member (44) is disposed in the connecting groove (411) formed on the fixed bottom mold (41), and the isolating member (44) is fitted with the side wall of the CFG pile body (2). The isolating member (44) is extended from one end close to the supporting pipe (31) and is fitted with the gap between adjacent fixed bottom molds (41).

6. The CFG pile foundation structure for improving foundation bearing capacity according to claim 4, characterized in that: A connection groove three (423) is provided on a side of the pile cap side formwork (42) away from the CFG pile body (2), and the connection groove three (423) is in contact with the support assembly two (6). The support assembly two (6) comprises a support frame one (61) arranged on the pile cap (5), and a support frame two (62) is arranged on the support frame one (61) in horizontal and vertical directions. The side walls of the support frame one (61) and the support frame two (62) are in contact with the connection groove three (423), and the side of the support frame one (61) and the support frame two (62) away from the CFG pile body (2) is flush with the side of the pile cap side formwork (42) away from the CFG pile body (2).

7. A CFG pile foundation structure for improving foundation bearing capacity according to claim 6, characterized in that: The side walls of the support frame 1 (61) and the support frame 2 (62) are provided with fixing grooves (611), and connecting rods (63) are arranged in the fixing grooves (611). The connecting rods (63) are connected to the pile cap (5) when the pile cap (5) is cast. The support frame 1 (61) and the support frame 2 (62) are connected to each other at their ends close to each other on the adjacent CFG pile bodies (2).

8. The CFG pile foundation structure for improving foundation bearing capacity according to claim 1, characterized in that: The fixing assembly (7) comprises a fixing rod (71) arranged on one side of the supporting frame 1 (61) and the supporting frame 2 (62) close to the CFG pile body (2); the fixing rod (71) is arranged and distributed along the direction of the supporting frame 1 (61) and the supporting frame 2 (62); a positioning groove 1 (21) which is in contact with the fixing rod (71) is provided on the CFG body; a positioning groove 2 (612) is provided on the supporting frame 1 (61) and the supporting frame 2 (62); the inner side wall of the positioning groove 2 (612) is in contact with the fixing rod (71).

9. A construction method of a CFG pile foundation structure for improving the bearing capacity of a foundation, characterized in that: A CFG pile foundation structure for improving foundation bearing capacity according to any one of claims 1 to 8, S100, leveling the foundation (1), driving the support pipe (31) of the support assembly (3) into the foundation (1), moving the drilling rig to a designated position, and excavating the pile foundation hole (12) on the foundation (1) so that the depth of the pile foundation hole (12) reaches the designed depth; S200, expanding the bottom of the pile foundation hole (12) to open a pile foundation groove (13), then stopping the rotation of the drill rod of the drilling rig, pumping concrete into the pile foundation hole (12) through the drill rod of the drilling rig, and pouring the CFG pile body (2); S300, after the CFG pile body (2) is solidified, the soil between the piles at the position above the pile foundation hole (12) of the foundation (1) is excavated to expose a portion of the top of the upper CFG pile body (2), and the pile head of the excess part of the CFG pile body (2) is cut to make the CFG pile body (2) at the same height; S400, then a pile cap template (4) is set up on the CFG pile body (2), the pile cap (5) is poured, and the soil between the piles is backfilled.

10. A construction method for a CFG pile foundation structure for improving foundation bearing capacity according to claim 9, characterized in that: S110, after the support pipe (31) is driven into the foundation (1), the support rod (32) on the outer wall of the support pipe (31) is also driven into the foundation (1) to support the support pipe (31), the drill bit on the drill rod of the drilling rig corresponds to the inner wall of the support pipe (31), and the pile foundation hole (12) of the foundation (1) is excavated. After reaching a specified depth, the drilling rig expands the pile foundation groove (13) below the pile foundation hole (12); S210, after the drill rod of the drilling rig stops rotating, concrete is pumped from the hollow drill rod of the drilling rig into the bottom of the pile foundation hole (12) and the pile foundation groove (13), and then the drilling rig slowly lifts the drill rod to make the concrete fall into the pile foundation hole (12) and the pile foundation groove (13), so that the CFG pile body (2) is cast and formed; S410, after the pile head of the CFG pile body (2) is cut, a positioning groove (21) is opened above the CFG pile body (2), and a fixing rod (71) is inserted into the positioning groove (21) above the CFG pile body (2) and connected to a supporting frame (61) and a supporting frame (62) installed on the pile cap template (4); S420, on the CFG pile body (2), the fixed bottom form (41) and the side cap of the pile cap (5) are spliced ​​around the side wall of the CFG pile body (2), the spliced ​​pile cap template (4) is fixed with a fixing clamp (43), the support frame 1 (61) and the support frame 2 (62) are installed on the pile cap template (4) to be flush with the pile cap template (4), the support frame 1 (61) and the support frame 2 (62) are connected to the fixing rod (71) inserted on the CFG pile body (2), the support frame 1 (61) and the support frame 2 (62) on adjacent CFG pile bodies (2) are welded together, the pile cap templates (4) on adjacent CFG pile bodies (2) are at the same height, and then the pile cap (5) is poured.

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