Cement solidified composite pile foundation capable of improving horizontal bearing capacity and construction method

Abstract

The invention discloses a cement solidification composite pile foundation capable of improving horizontal bearing capacity and a construction method. The cement solidification composite pile foundation capable of improving the horizontal bearing capacity and the construction method can effectively improve the horizontal bearing capacity of a pile foundation. A cement solidification composite pile foundation capable of improving horizontal bearing capacity comprises a prestress high-strength concrete pipe pile. The upper end of the sludge solidification reinforcement body is flush with or close to the sludge surface, the prestressed high-strength concrete pipe pile penetrates through the sludge solidification reinforcement body, the distance between the top surface and the bottom surface of the sludge solidification reinforcement body is 3-10 times of the outer diameter of the high-strength concrete pipe pile, and the lower end of the prestressed high-strength concrete pipe pile is inserted into a soil layer below the sludge solidification reinforcement body.

Description

Technical Field

[0001] This invention relates to the field of pile foundation technology, specifically to a cement-cured composite pile foundation and construction method for improving horizontal bearing capacity. Background Technology

[0002] Currently, when using traditional pipe piles in soft soil foundations, the low strength and high compressibility of soft soil itself result in limited horizontal bearing capacity of the pipe piles, making it difficult to meet the foundation stability requirements of modern construction projects. Especially in solar-aquaculture hybrid projects using flexible supports, the end anchor piles need to balance the horizontal tension generated by the large-span load-bearing cables. Based on engineering experience, often 2-3 PHC pipe piles (i.e., prestressed high-strength concrete pipe piles) are needed to achieve this balance, leading to a significant increase in the investment cost of photovoltaic power stations. Currently, some invention patents aim to improve the bearing capacity of piles through certain means. For example, Chinese Patent Publication No. CN220789824U, entitled "An End Pile Foundation Structure for Horizontal Bearing Capacity of Pile Foundations," proposes setting anti-horizontal force side plates on the sides of the anchor piles of flexible supports. While this optimizes the end anti-horizontal force measures, in actual construction, it is often difficult to reliably connect the anti-horizontal force side plates to the anchor piles (failing to meet the designed horizontal bearing capacity requirements, affecting the actual horizontal bearing capacity of the pile foundation) and the design life requirements of the foundation. Summary of the Invention

[0003] The purpose of this invention is to provide a cement-cured composite pile foundation and construction method that can effectively improve the horizontal bearing capacity of pile foundations.

[0004] The technical solution of this invention is: A cement-cured composite pile foundation for improving horizontal bearing capacity includes: Prestressed high-strength concrete pipe piles; The silt solidification reinforcement has its upper end flush with or close to the silt surface. Prestressed high-strength concrete pipe piles pass through the silt solidification reinforcement. The distance between the top and bottom surfaces of the silt solidification reinforcement is 3-10 times the outer diameter of the high-strength concrete pipe pile. The lower end of the prestressed high-strength concrete pipe pile is inserted into the soil layer below the silt solidification reinforcement. This scheme proposes a cement-cured composite pile foundation for improving horizontal bearing capacity. It involves constructing a silt-cured reinforcement within the soil layer. Before the initial setting of the silt-cured reinforcement, prestressed high-strength concrete pipe piles are inserted into it, with the lower end of the pipe pile passing through the reinforcement and embedded in the soil layer below. During this process, the prestressed high-strength concrete pipe piles compress the silt-cured reinforcement, resulting in a tighter interface between the piles, the reinforcement, and the surrounding soil. Part of the cured soil or curing agent slurry from the reinforcement splits the surrounding soil, increasing contact and friction between the reinforcement and the soil. Thus, after the silt-cured reinforcement has cured, a strong bond is formed between the prestressed high-strength concrete pipe piles, the reinforcement, and the soil, facilitating load transfer. Furthermore, the prestressed high-strength concrete pipe piles and the reinforcement become a unified whole, jointly bearing the load, thereby effectively improving the horizontal bearing capacity of the pile foundation.

[0005] Meanwhile, since the upper end of the silt-stabilized reinforcement is flush with or close to the silt surface, and the distance between the top and bottom surfaces of the silt-stabilized reinforcement is 3-10 times the outer diameter of the high-strength concrete pipe pile, the lower end of the prestressed high-strength concrete pipe pile is inserted into the soil layer below the silt-stabilized reinforcement. In this way, the construction amount of the silt-stabilized reinforcement can be effectively reduced, the construction period can be shortened, and the construction cost can be reduced while effectively improving the horizontal bearing capacity of the pile foundation. Therefore, the cement-stabilized composite pile foundation with improved horizontal bearing capacity proposed in this scheme has the characteristics of high horizontal bearing capacity, short construction period, and good safety.

[0006] Preferably, the silt-stabilized reinforcement is composed of a pile cap formed by mixing and solidifying cement and soil. This construction method results in a silt-stabilized reinforcement with a relatively regular shape, similar to a pile cap.

[0007] Preferably, the silt solidification reinforcement is composed of multiple high-pressure jet grouting piles interlocking or multiple cement-soil mixing piles interlocking.

[0008] Preferably, the silt-stabilized reinforcement consists of at least two reinforcing pile segments arranged sequentially from top to bottom, with a gap between any two adjacent reinforcing pile segments. Prestressed high-strength concrete pipe piles pass through each reinforcing pile segment sequentially from top to bottom. In this way, the horizontal bearing capacity of the cement-stabilized composite pile foundation can be improved by forming multiple reinforcing pile segments without increasing the amount of silt-stabilized reinforcement work, or with only a slight increase in the amount of silt-stabilized reinforcement work.

[0009] Preferably, the silt-stabilized reinforcement includes at least two reinforcing pile segments distributed sequentially from top to bottom. There is a gap between any two adjacent reinforcing pile segments, and at least two interlocking pile segments are evenly distributed around the circumference of each adjacent reinforcing pile segment between them. These interlocking pile segments connect the corresponding adjacent reinforcing pile segments into a single unit. The prestressed high-strength concrete pipe pile passes through each reinforcing pile segment sequentially from top to bottom. In this way, without increasing the amount of silt-stabilized reinforcement construction, or with only a slight increase, a three-dimensional, suspended structure of silt-stabilized reinforcement is formed by creating multiple reinforcing pile segments and multiple interlocking pile segments. This effectively increases the horizontal and depth space occupied by the silt-stabilized reinforcement, thereby further improving the horizontal bearing capacity of the cement-stabilized composite pile foundation.

[0010] Preferably, prestressed high-strength concrete pipe piles pass through each reinforcing pile segment in sequence. The prestressed high-strength concrete pipe piles are located at the center of the reinforcing pile segments. The outer diameter of the reinforcing pile segments is 300-400mm larger than the outer diameter of the prestressed high-strength concrete pipe piles. The height of each reinforcing pile segment is consistent, and the height of each reinforcing pile segment is 2-4 times the outer diameter of the high-strength concrete pipe pile.

[0011] A construction method for improving the horizontal bearing capacity of cement-cured composite pile foundations includes the following steps: First, the silt solidification reinforcement is constructed by using a powerful mixing head to vertically mix and spray solidification material to form a silt solidification reinforcement in the soil layer. The upper end of the silt solidification reinforcement is flush with or close to the mud surface. Secondly, before the initial setting of the silt-stabilized reinforcement, prestressed high-strength concrete pipe piles are inserted into the silt-stabilized reinforcement. The lower end of the prestressed high-strength concrete pipe pile passes through the silt-stabilized reinforcement and is inserted into the soil layer below it. During the insertion process, the prestressed high-strength concrete pipe piles compress the silt-stabilized reinforcement, resulting in a tighter interface between the prestressed high-strength concrete pipe piles, the silt-stabilized reinforcement, and the surrounding soil. Part of the solidified soil or curing agent slurry in the silt-stabilized reinforcement splits the surrounding soil, increasing the contact and friction between the silt-stabilized reinforcement and the surrounding soil. Thus, after the silt-stabilized reinforcement has solidified, a greater bond force is formed between the prestressed high-strength concrete pipe piles, the silt-stabilized reinforcement, and the surrounding soil, which is beneficial for load transfer. Furthermore, the prestressed high-strength concrete pipe piles and the silt-stabilized reinforcement become a unified whole, jointly bearing the load; thereby effectively improving the horizontal bearing capacity of the pile foundation.

[0012] A construction method for improving the horizontal bearing capacity of cement-cured composite pile foundations includes the following steps: First, construct a silt solidification reinforcement body by using a high-pressure jet grouting pile machine or a cement-soil mixing pile machine to sequentially construct several interlocking high-pressure jet grouting piles or several cement-soil mixing piles in the soil layer to form a silt solidification reinforcement body in the soil layer. The upper end of the silt solidification reinforcement body is flush with or close to the mud surface. Secondly, before the initial setting of the silt-stabilized reinforcement, prestressed high-strength concrete pipe piles are inserted into the silt-stabilized reinforcement. The lower end of the prestressed high-strength concrete pipe pile passes through the silt-stabilized reinforcement and is inserted into the soil layer below it. During the insertion process, the prestressed high-strength concrete pipe piles compress the silt-stabilized reinforcement, resulting in a tighter interface between the prestressed high-strength concrete pipe piles, the silt-stabilized reinforcement, and the surrounding soil. Part of the solidified soil or curing agent slurry in the silt-stabilized reinforcement splits the surrounding soil, increasing the contact and friction between the silt-stabilized reinforcement and the surrounding soil. Thus, after the silt-stabilized reinforcement has solidified, a greater bond force is formed between the prestressed high-strength concrete pipe piles, the silt-stabilized reinforcement, and the surrounding soil, which is beneficial for load transfer. Furthermore, the prestressed high-strength concrete pipe piles and the silt-stabilized reinforcement become a unified whole, jointly bearing the load; thereby effectively improving the horizontal bearing capacity of the pile foundation.

[0013] A construction method for improving the horizontal bearing capacity of cement-cured composite pile foundations includes the following steps: First, construct the silt solidification reinforcement body. Use a high-pressure jet grouting pile machine to construct at least two reinforcement pile segments in the soil layer from bottom to top to form a silt solidification reinforcement body in the soil layer. Each reinforcement pile segment includes at least two interlocking high-pressure jet grouting pile segments. The upper end of the uppermost reinforcement pile segment is flush with or close to the mud surface. Secondly, before the initial setting of the silt-stabilized reinforcement, prestressed high-strength concrete pipe piles are inserted into the silt-stabilized reinforcement. The prestressed high-strength concrete pipe piles pass through each reinforcement segment sequentially from top to bottom, with their lower ends embedded in the soil layer below the silt-stabilized reinforcement. During the insertion process, the prestressed high-strength concrete pipe piles compress the silt-stabilized reinforcement, resulting in a tighter interface between the prestressed high-strength concrete pipe piles, the silt-stabilized reinforcement, and the surrounding soil. Part of the solidified soil or hardening agent slurry in the silt-stabilized reinforcement splits the surrounding soil, increasing the contact and friction between the silt-stabilized reinforcement and the surrounding soil. Thus, after the silt-stabilized reinforcement has solidified, a greater bond force is formed between the prestressed high-strength concrete pipe piles, the silt-stabilized reinforcement, and the surrounding soil, which is beneficial for load transfer. Furthermore, the prestressed high-strength concrete pipe piles and the silt-stabilized reinforcement become a unified whole, jointly bearing the load, thereby effectively improving the horizontal bearing capacity of the pile foundation.

[0014] On the other hand, the silt solidification reinforcement consists of at least two reinforced pile segments distributed sequentially from top to bottom. In this way, the horizontal bearing capacity of the cement-solidified composite pile foundation can be improved by forming multiple reinforced pile segments without increasing the amount of silt solidification reinforcement construction, or with a small increase in the amount of silt solidification reinforcement construction.

[0015] A construction method for improving the horizontal bearing capacity of cement-cured composite pile foundations includes the following steps: First, the silt is solidified and reinforced. At least two reinforced pile segments are constructed in the soil layer from bottom to top using a high-pressure jet grouting machine. Each reinforced pile segment consists of one high-pressure jet grouting pile segment. The upper end of the uppermost reinforced pile segment is flush with or close to the mud surface. Two interlocking pile segments are constructed between any two adjacent reinforced pile segments, which are evenly distributed around the circumference of the reinforced pile segments. The interlocking pile segments connect the corresponding two adjacent reinforced pile segments into one. Secondly, before the initial setting of the silt-stabilized reinforcement, prestressed high-strength concrete pipe piles are sequentially inserted through each reinforcement pile segment from top to bottom, with the lower end of the prestressed high-strength concrete pipe piles embedded in the soil layer below the silt-stabilized reinforcement. During the insertion of the prestressed high-strength concrete pipe piles into the silt-stabilized reinforcement, the prestressed high-strength concrete pipe piles compress the silt-stabilized reinforcement, resulting in a tighter contact between the prestressed high-strength concrete pipe piles, the silt-stabilized reinforcement, and the surrounding soil. Part of the solidified soil or hardening agent slurry in the silt-stabilized reinforcement splits the surrounding soil, increasing the contact and friction between the silt-stabilized reinforcement and the surrounding soil. Thus, after the silt-stabilized reinforcement has solidified, a greater bond force is formed between the prestressed high-strength concrete pipe piles, the silt-stabilized reinforcement, and the surrounding soil, which is beneficial for load transfer. Furthermore, the prestressed high-strength concrete pipe piles and the silt-stabilized reinforcement become a unified whole, jointly bearing the load; thereby effectively improving the horizontal bearing capacity of the pile foundation.

[0016] On the other hand, without increasing the amount of silt-solidified reinforcement, or with a small increase in the amount of silt-solidified reinforcement, a three-dimensional suspended structure of silt-solidified reinforcement can be formed by creating multiple reinforced pile segments and multiple interlocking pile segments. This can effectively increase the horizontal and depth space occupied by the silt-solidified reinforcement, thereby further improving the horizontal bearing capacity of the cement-solidified composite pile foundation.

[0017] The beneficial effects of this invention are as follows: During the insertion of the prestressed high-strength concrete pipe pile into the silt-solidified reinforcement, the prestressed high-strength concrete pipe pile compresses the silt-solidified reinforcement, making the interface between the prestressed high-strength concrete pipe pile, the silt-solidified reinforcement, and the surrounding soil more tightly connected. Part of the solidified soil or curing agent slurry of the silt-solidified reinforcement splits the surrounding soil, increasing the contact and friction between the silt-solidified reinforcement and the surrounding soil. Thus, after the silt-solidified reinforcement has solidified, a greater bond force is formed between the prestressed high-strength concrete pipe pile, the silt-solidified reinforcement, and the surrounding soil, which is beneficial for load transfer. Furthermore, the prestressed high-strength concrete pipe pile and the silt-solidified reinforcement become a unified whole, jointly bearing the load; thereby effectively improving the horizontal bearing capacity of the pile foundation. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the elevation structure of a cement-cured composite pile foundation for improving horizontal bearing capacity according to the present invention.

[0019] Figure 2 This is a schematic diagram of another elevation structure of a cement-cured composite pile foundation for improving horizontal bearing capacity according to the present invention.

[0020] Figure 3 This is a schematic diagram of the third elevation structure of a cement-cured composite pile foundation for improving horizontal bearing capacity according to the present invention.

[0021] Figure 4 This is a plan view of one embodiment of a cement-cured composite pile foundation for improving horizontal bearing capacity according to the present invention.

[0022] Figure 5 This is a plan view of another embodiment of the cement-cured composite pile foundation for improving horizontal bearing capacity according to the present invention.

[0023] Figure 6 This is a plan view of a third embodiment of the cement-cured composite pile foundation for improving horizontal bearing capacity according to the present invention.

[0024] Figure 7 This is a plan view of the fourth embodiment of a cement-cured composite pile foundation for improving horizontal bearing capacity according to the present invention.

[0025] In the picture: 1. Prestressed high-strength concrete pipe piles; 2. Silt solidification reinforcement body, 2.0. High-pressure jet grouting pile, 2.1. Reinforced pile segment, 2.2. Interlocking pile segment; Mud surface 3; Water surface 4. Detailed Implementation

[0026] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments: Specific Implementation Example 1, such as Figure 1 As shown, a cement-cured composite pile foundation for improving horizontal bearing capacity includes a prestressed high-strength concrete pipe pile 1 and a silt-cured reinforcement 2.

[0027] The upper end of the silt solidification reinforcement 2 is flush with or close to the mud surface 3. In this embodiment, the upper end of the silt solidification reinforcement 2 is flush with the mud surface 3. The distance between the top and bottom surfaces of the silt solidification reinforcement 2 is 3-10 times the outer diameter of the high-strength concrete pipe pile.

[0028] The prestressed high-strength concrete pipe pile 1 penetrates the silt-stabilized reinforcement 2; specifically, before the silt-stabilized reinforcement 2 solidifies, the prestressed high-strength concrete pipe pile 1 is inserted into the silt-stabilized reinforcement 2 from top to bottom and the pile penetrates through the silt-stabilized reinforcement 2. The lower end of the prestressed high-strength concrete pipe pile 1 is inserted into the soil layer below the silt-stabilized reinforcement 2. This embodiment of a cement-solidified composite pile foundation for improving horizontal bearing capacity involves constructing a silt-solidified reinforcement 2 within the soil layer. Before the initial setting of the silt-solidified reinforcement 2, a prestressed high-strength concrete pipe pile 1 is inserted into the silt-solidified reinforcement 2. The lower end of the prestressed high-strength concrete pipe pile 1 passes through the silt-solidified reinforcement 2 and is inserted into the soil layer below it. During this process, the prestressed high-strength concrete pipe pile 1 compresses the silt-solidified reinforcement 2, causing the prestressed high-strength concrete pipe pile 1, the silt-solidified reinforcement 2, and the surrounding soil to form a boundary... The surface contact is closer, and the solidified soil or solidifying agent slurry of the partially solidified silt reinforcement 2 splits the soil around the pile, increasing the contact and friction between the solidified silt reinforcement 2 and the soil around the pile. Thus, after the solidified silt reinforcement 2 is solidified, a large bond force is formed between the prestressed high-strength concrete pipe pile 1, the solidified silt reinforcement 2 and the soil around the pile, which is conducive to the transfer of load. Furthermore, the prestressed high-strength concrete pipe pile 1 and the solidified silt reinforcement 2 become a whole and jointly bear the load, thereby effectively improving the horizontal bearing capacity of the pile foundation.

[0029] Meanwhile, since the upper end of the silt-stabilized reinforcement 2 is flush with or close to the mud surface 3, and the distance between the top and bottom surfaces of the silt-stabilized reinforcement 2 is 3-10 times the outer diameter of the high-strength concrete pipe pile, the lower end of the prestressed high-strength concrete pipe pile 1 is inserted into the soil layer below the silt-stabilized reinforcement 2; thus, the construction volume of the silt-stabilized reinforcement 2 can be effectively reduced, the construction period can be shortened, and the construction cost can be reduced while effectively improving the horizontal bearing capacity of the pile foundation; therefore, the cement-stabilized composite pile foundation with improved horizontal bearing capacity proposed in this scheme has the characteristics of high horizontal bearing capacity, short construction period, and good safety.

[0030] like Figure 1As shown, when a cement-cured composite pile foundation with improved horizontal bearing capacity is applied in a water environment, the top elevation of the prestressed high-strength concrete pipe pile 1 is 300-500mm above the water surface 4.

[0031] Furthermore, the formation mechanism of the sludge solidification reinforcement 2 is as follows: In one implementation, such as Figure 1 , Figure 4 As shown, the silt-stabilized reinforcement 2 is composed of a pile cap formed by cement-soil mixing and solidification. This construction method creates a relatively regularly shaped silt-stabilized reinforcement 2, similar to a pile cap. In this embodiment, the silt-stabilized reinforcement 2 is square, and its width is 4-6 times that of the prestressed high-strength concrete pipe pile 1. In this embodiment, as... Figure 5 As shown, when the spacing between multiple prestressed high-strength concrete pipe piles 1 is less than the width of the silt-solidified reinforcement 2, the silt-solidified reinforcement 2 corresponding to the multiple prestressed high-strength concrete pipe piles 1 can be connected as a single piece, thereby further improving the horizontal bearing capacity. The height of the silt-solidified reinforcement 2 is 3-5 times the outer diameter of the high-strength concrete pipe pile.

[0032] In another implementation, such as Figure 1 , Figure 6 As shown, the sludge solidification reinforcement 2 is composed of multiple high-pressure jet grouting piles 2.0 interlocked. The high-pressure jet grouting piles 2.0 are formed by a high-pressure jet grouting machine. The height of the sludge solidification reinforcement 2 is 3-5 times the outer diameter of the high-strength concrete pipe pile. In this embodiment, as... Figure 7 As shown, when the spacing between multiple prestressed high-strength concrete pipe piles 1 is less than the width of the silt solidification reinforcement 2, the silt solidification reinforcement 2 corresponding to the multiple prestressed high-strength concrete pipe piles 1 can be connected as a single piece, thereby further improving the horizontal bearing capacity.

[0033] In the third embodiment, the silt-stabilized reinforcement 2 is composed of multiple interlocking cement-soil mixing piles. The cement-soil mixing piles are constructed using a cement-soil mixing pile machine. The height of the silt-stabilized reinforcement 2 is 3-5 times the outer diameter of the high-strength concrete pipe pile. In this embodiment, when the spacing between multiple prestressed high-strength concrete pipe piles 1 is less than the width of the silt-stabilized reinforcement 2, the silt-stabilized reinforcement 2 corresponding to the multiple prestressed high-strength concrete pipe piles 1 can be connected as a single piece, thereby further improving the horizontal bearing capacity.

[0034] In the fourth embodiment, such as Figure 2As shown, the silt-stabilized reinforcement 2 consists of at least two reinforcing pile segments 2.1 arranged sequentially from top to bottom, with a gap between any two adjacent reinforcing pile segments 2.1. Prestressed high-strength concrete pipe piles 1 pass through each reinforcing pile segment 2.1 sequentially from top to bottom. In this embodiment, the reinforcing pile segments 2.1 are formed by high-pressure jet grouting piles constructed by a high-pressure jet grouting machine, with the same reinforcing pile segment 2.1 formed by the interlocking of one or more high-pressure jet grouting pile segments; or the reinforcing pile segments 2.1 are formed by cement-soil mixing piles constructed by a cement-soil mixing pile machine, with the same reinforcing pile segment 2.1 formed by the interlocking of one or more cement-soil mixing pile segments. Thus, the horizontal bearing capacity of the cement-stabilized composite pile foundation can be improved by forming multiple reinforcing pile segments 2.1 without increasing the amount of silt-stabilized reinforcement 2 constructed, or with a slight increase in the amount of silt-stabilized reinforcement 2 constructed.

[0035] In the fifth implementation, such as Figure 3 As shown, the silt solidification reinforcement 2 includes at least two reinforcing pile segments 2.1 distributed sequentially from top to bottom. There is a gap between any two adjacent reinforcing pile segments 2.1. At least two interlocking pile segments 2.2 are evenly distributed around the circumference of any two adjacent reinforcing pile segments 2.1. The interlocking pile segments 2.2 interlock and connect the corresponding two adjacent reinforcing pile segments 2.1 into a single unit. The prestressed high-strength concrete pipe pile 1 passes through each reinforcing pile segment 2.1 sequentially from top to bottom. The reinforcing pile segments 2.1 and the interlocking pile segments 2.2 are composed of high-pressure jet grouting pile segments constructed by a high-pressure jet grouting machine; or the reinforcing pile segment 2.1 is composed of cement-soil mixing pile segments constructed by a cement-soil mixing machine. In this way, without increasing the amount of silt-solidified reinforcement 2 constructed, or with a slight increase in the amount of silt-solidified reinforcement 2 constructed, a three-dimensional suspended structure of silt-solidified reinforcement 2 can be formed by creating multiple reinforced pile segments 2.1 and multiple interlocking pile segments 2.2. This effectively increases the horizontal and depth space occupied by the silt-solidified reinforcement 2, thereby further improving the horizontal bearing capacity of the cement-solidified composite pile foundation. In this embodiment, the prestressed high-strength concrete pipe pile 1 is located at the center of the reinforced pile segment 2.1. The outer diameter of the reinforced pile segment 2.1 is 300-400 mm larger than the outer diameter of the prestressed high-strength concrete pipe pile 1. The height of each reinforced pile segment 2.1 is consistent, and the height of each reinforced pile segment 2.1 is 2-4 times the outer diameter of the high-strength concrete pipe pile.

[0036] Specific Embodiment Two: A construction method for improving the horizontal bearing capacity of a cement-cured composite pile foundation includes the following steps. First, such as Figure 1 , Figure 4As shown, the silt solidification reinforcement 2 is constructed by using a powerful mixing head to vertically stir and spray solidification material, forming the silt solidification reinforcement 2 in the soil layer. The upper end of the silt solidification reinforcement 2 is flush with or close to the mud surface 3. The height of the silt solidification reinforcement 2 is 3-5 times the outer diameter of the high-strength concrete pipe pile. The specific formula of the solidification material is existing technology and is not the inventive point of this application. Therefore, this application will not elaborate on the specific formula of the solidification material and other conventional technical means.

[0037] Secondly, before the initial setting of the silt-stabilized reinforcement 2, the prestressed high-strength concrete pipe pile 1 is inserted into the silt-stabilized reinforcement 2. The lower end of the prestressed high-strength concrete pipe pile 1 passes through the silt-stabilized reinforcement 2 and is inserted into the soil layer below the silt-stabilized reinforcement 2. During the insertion of the prestressed high-strength concrete pipe pile 1 into the silt-stabilized reinforcement 2, the prestressed high-strength concrete pipe pile 1 compresses the silt-stabilized reinforcement 2, making the interface between the prestressed high-strength concrete pipe pile 1, the silt-stabilized reinforcement 2, and the surrounding soil more tightly connected. Some of the solidified soil or solidifying agent slurry of the silt-stabilized reinforcement 2 splits the surrounding soil, increasing the contact and friction between the silt-stabilized reinforcement 2 and the surrounding soil. Thus, after the silt-stabilized reinforcement 2 has solidified, a large bond force is formed between the interface between the prestressed high-strength concrete pipe pile 1, the silt-stabilized reinforcement 2, and the surrounding soil, which is conducive to load transfer. Furthermore, the prestressed high-strength concrete pipe pile 1 and the silt-stabilized reinforcement 2 become a whole, jointly bearing the load, thereby effectively improving the horizontal bearing capacity of the pile foundation.

[0038] Meanwhile, since the upper end of the silt-solidified reinforcement 2 is flush with or close to the mud surface 3, and the height of the silt-solidified reinforcement 2 is 3-5 times the outer diameter of the high-strength concrete pipe pile, the lower end of the prestressed high-strength concrete pipe pile 1 is inserted into the soil layer below the silt-solidified reinforcement 2; thus, the construction amount of the silt-solidified reinforcement 2 can be effectively reduced, the construction period can be shortened, and the construction cost can be reduced while effectively improving the horizontal bearing capacity of the pile foundation; therefore, the cement-solidified composite pile foundation with improved horizontal bearing capacity proposed in this scheme has the characteristics of high horizontal bearing capacity, short construction period, and good safety.

[0039] like Figure 5 As shown, when the spacing between multiple prestressed high-strength concrete pipe piles 1 is less than the width of the silt solidification reinforcement 2, the silt solidification reinforcement 2 corresponding to the multiple prestressed high-strength concrete pipe piles 1 can be connected as a single piece, thereby further improving the horizontal bearing capacity.

[0040] Specific Embodiment Three: A construction method for improving the horizontal bearing capacity of a cement-cured composite pile foundation, comprising the following steps. like Figure 1 , Figure 6 As shown, a construction method for improving the horizontal bearing capacity of a cement-cured composite pile foundation includes the following steps: First, the silt-stabilized reinforcement body 2 is constructed using a high-pressure jet grouting machine or a cement-soil mixing machine. Several interlocking high-pressure jet grouting piles or cement-soil mixing piles are sequentially constructed in the soil layer to form the silt-stabilized reinforcement body 2. The upper end of the silt-stabilized reinforcement body 2 is flush with or close to the mud surface 3. The height of the silt-stabilized reinforcement body 2 is 3-5 times the outer diameter of the high-strength concrete pipe pile.

[0041] Secondly, before the initial setting of the silt-stabilized reinforcement 2, the prestressed high-strength concrete pipe pile 1 is inserted into the silt-stabilized reinforcement 2. The lower end of the prestressed high-strength concrete pipe pile 1 passes through the silt-stabilized reinforcement 2 and is inserted into the soil layer below the silt-stabilized reinforcement 2. During the insertion of the prestressed high-strength concrete pipe pile 1 into the silt-stabilized reinforcement 2, the prestressed high-strength concrete pipe pile 1 compresses the silt-stabilized reinforcement 2, making the interface between the prestressed high-strength concrete pipe pile 1, the silt-stabilized reinforcement 2, and the surrounding soil more tightly connected. Some of the solidified soil or solidifying agent slurry of the silt-stabilized reinforcement 2 splits the surrounding soil, increasing the contact and friction between the silt-stabilized reinforcement 2 and the surrounding soil. Thus, after the silt-stabilized reinforcement 2 has solidified, a large bond force is formed between the interface between the prestressed high-strength concrete pipe pile 1, the silt-stabilized reinforcement 2, and the surrounding soil, which is conducive to load transfer. Furthermore, the prestressed high-strength concrete pipe pile 1 and the silt-stabilized reinforcement 2 become a whole, jointly bearing the load, thereby effectively improving the horizontal bearing capacity of the pile foundation.

[0042] Meanwhile, since the upper end of the silt-solidified reinforcement 2 is flush with or close to the mud surface 3, and the height of the silt-solidified reinforcement 2 is 3-5 times the outer diameter of the high-strength concrete pipe pile, the lower end of the prestressed high-strength concrete pipe pile 1 is inserted into the soil layer below the silt-solidified reinforcement 2; thus, the construction amount of the silt-solidified reinforcement 2 can be effectively reduced, the construction period can be shortened, and the construction cost can be reduced while effectively improving the horizontal bearing capacity of the pile foundation; therefore, the cement-solidified composite pile foundation with improved horizontal bearing capacity proposed in this scheme has the characteristics of high horizontal bearing capacity, short construction period, and good safety.

[0043] like Figure 7 As shown, when the spacing between multiple prestressed high-strength concrete pipe piles 1 is less than the width of the silt solidification reinforcement 2, the silt solidification reinforcement 2 corresponding to the multiple prestressed high-strength concrete pipe piles 1 can be connected as a single piece, thereby further improving the horizontal bearing capacity.

[0044] Specific Embodiment Four: A construction method for improving the horizontal bearing capacity of a cement-cured composite pile foundation, comprising the following steps. like Figure 2 As shown, a construction method for improving the horizontal bearing capacity of a cement-cured composite pile foundation includes the following steps: First, the silt-solidified reinforcement body 2 is constructed by using a high-pressure jet grouting machine to sequentially construct at least two reinforcement pile segments 2.1 from bottom to top in the soil layer to form the silt-solidified reinforcement body 2. In this embodiment, there are three reinforcement pile segments 2.1, each including at least two interlocking high-pressure jet grouting segments. The uppermost reinforcement pile segment 2.1 has its upper end flush with or close to the mud surface 3. The height of each reinforcement pile segment 2.1 is consistent, and the height of each reinforcement pile segment 2.1 is 2-4 times the outer diameter of the high-strength concrete pipe pile. The spacing between any two adjacent reinforcement pile segments 2.1 is 1-2 times the outer diameter of the high-strength concrete pipe pile.

[0045] Second, before the initial setting of the silt solidification reinforcement 2, the prestressed high-strength concrete pipe pile 1 is inserted into the silt solidification reinforcement 2. The prestressed high-strength concrete pipe pile 1 passes through each reinforcement pile segment 2.1 from top to bottom, and the lower end of the prestressed high-strength concrete pipe pile 1 is inserted into the soil layer below the silt solidification reinforcement 2. During the insertion of the prestressed high-strength concrete pipe pile 1 into the silt-solidified reinforcement body 2, the prestressed high-strength concrete pipe pile 1 compresses the silt-solidified reinforcement body 2, making the interface between the prestressed high-strength concrete pipe pile 1, the silt-solidified reinforcement body 2 and the surrounding soil more compact. Part of the solidified soil or solidifying agent grout of the silt-solidified reinforcement body 2 splits the surrounding soil, increasing the contact and friction between the silt-solidified reinforcement body 2 and the surrounding soil. Thus, after the silt-solidified reinforcement body 2 solidifies, a greater bond force is formed between the prestressed high-strength concrete pipe pile 1, the silt-solidified reinforcement body 2 and the surrounding soil, which is beneficial for load transfer. Furthermore, the prestressed high-strength concrete pipe pile 1 and the silt-solidified reinforcement body 2 become a unified whole, jointly bearing the load; thereby effectively improving the horizontal bearing capacity of the pile foundation.

[0046] On the other hand, the silt solidification reinforcement 2 is composed of at least two reinforcement pile segments 2.1 distributed sequentially from top to bottom. In this way, the horizontal bearing capacity of the cement-solidified composite pile foundation can be improved by forming multiple reinforcement pile segments 2.1 without increasing the amount of silt solidification reinforcement 2 construction, or with a small increase in the amount of silt solidification reinforcement 2 construction.

[0047] Specific Embodiment Five: A construction method for improving the horizontal bearing capacity of a cement-cured composite pile foundation, comprising the following steps. like Figure 3 As shown, a construction method for improving the horizontal bearing capacity of a cement-cured composite pile foundation includes the following steps: First, the silt-solidified reinforcement body 2 is constructed by using a high-pressure jet grouting machine to sequentially construct at least two reinforcement pile segments 2.1 from bottom to top in the soil layer. In this embodiment, there are three reinforcement pile segments 2.1, each consisting of one high-pressure jet grouting segment. The uppermost reinforcement pile segment 2.1 has its upper end flush with or close to the mud surface 3. The height of each reinforcement pile segment 2.1 is consistent, and the height of each reinforcement pile segment 2.1 is 2-4 times the outer diameter of the high-strength concrete pipe pile. The spacing between any two adjacent reinforcement pile segments 2.1 is 1-2 times the outer diameter of the high-strength concrete pipe pile.

[0048] Two interlocking pile segments 2.2 are constructed circumferentially between any two adjacent reinforced pile segments 2.1 using a high-pressure jet grouting machine. The interlocking pile segments 2.2 connect the corresponding two adjacent reinforced pile segments 2.1 into one unit.

[0049] Secondly, before the initial setting of the silt-stabilized reinforcement 2, the prestressed high-strength concrete pipe pile 1 is inserted sequentially through each reinforcement pile segment 2.1 from top to bottom, with the lower end of the prestressed high-strength concrete pipe pile 1 inserted into the soil layer below the silt-stabilized reinforcement 2. During the insertion of the prestressed high-strength concrete pipe pile 1 into the silt-stabilized reinforcement 2, the prestressed high-strength concrete pipe pile 1 compresses the silt-stabilized reinforcement 2, making the interface between the prestressed high-strength concrete pipe pile 1, the silt-stabilized reinforcement 2, and the surrounding soil more tightly connected. Some of the solidified soil or solidifying agent slurry of the silt-stabilized reinforcement 2 splits the surrounding soil, increasing the contact and friction between the silt-stabilized reinforcement 2 and the surrounding soil. Thus, after the silt-stabilized reinforcement 2 has solidified, a large bond force is formed between the prestressed high-strength concrete pipe pile 1, the silt-stabilized reinforcement 2, and the surrounding soil, which is beneficial for load transfer. Furthermore, the prestressed high-strength concrete pipe pile 1 and the silt-stabilized reinforcement 2 become a whole, jointly bearing the load, thereby effectively improving the horizontal bearing capacity of the pile foundation.

[0050] On the other hand, without increasing the amount of silt-solidified reinforcement 2, or with a small increase in the amount of silt-solidified reinforcement 2, a three-dimensional suspended structure of silt-solidified reinforcement 2 can be formed by forming multiple reinforced pile segments 2.1 and multiple interlocking pile segments 2.2 to effectively increase the horizontal and depth space occupied by the silt-solidified reinforcement 2, thereby further improving the horizontal bearing capacity of the cement-solidified composite pile foundation.

[0051] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention in any way. Any simple modifications, alterations, and equivalent transformations made to the above embodiments based on the technical essence of the present invention shall still fall within the protection scope of the present invention.

Claims

1. A cement-cured composite pile foundation for improving horizontal bearing capacity, characterized in that, include: Prestressed high-strength concrete pipe piles; The silt solidification reinforcement has its upper end flush with or close to the silt surface. Prestressed high-strength concrete pipe piles pass through the silt solidification reinforcement. The distance between the top and bottom surfaces of the silt solidification reinforcement is 3-10 times the outer diameter of the high-strength concrete pipe pile. The lower end of the prestressed high-strength concrete pipe pile is inserted into the soil layer below the silt solidification reinforcement.

2. The cement-cured composite pile foundation for improving horizontal bearing capacity according to claim 1, characterized in that, The silt solidification reinforcement is composed of a pile cap formed by mixing and solidifying cement and soil.

3. The cement-cured composite pile foundation for improving horizontal bearing capacity according to claim 1, characterized in that, The silt solidification reinforcement is composed of multiple high-pressure jet grouting piles interlocked or multiple cement-soil mixing piles interlocked.

4. A cement-cured composite pile foundation for improving horizontal bearing capacity according to claim 1, 2, or 3, characterized in that, The silt solidification reinforcement consists of at least two reinforcement pile segments distributed sequentially from top to bottom, with a gap between any two adjacent reinforcement pile segments, and prestressed high-strength concrete pipe piles passing through each reinforcement pile segment sequentially from top to bottom.

5. A cement-cured composite pile foundation for improving horizontal bearing capacity according to claim 1, 2, or 3, characterized in that, The silt solidification reinforcement includes at least two reinforcement pile segments distributed sequentially from top to bottom. There is a gap between any two adjacent reinforcement pile segments. At least two interlocking pile segments are provided between any two adjacent reinforcement pile segments, which are evenly distributed around the circumference of the reinforcement pile segments. The interlocking pile segments interlock and connect the corresponding two adjacent reinforcement pile segments into one unit. The prestressed high-strength concrete pipe pile passes through each reinforcement pile segment sequentially from top to bottom.

6. A cement-cured composite pile foundation for improving horizontal bearing capacity according to claim 5, characterized in that, The prestressed high-strength concrete pipe pile is located at the center of the reinforced pile segment. The outer diameter of the reinforced pile segment is 300-400mm larger than that of the prestressed high-strength concrete pipe pile. The height of each reinforced pile segment is consistent, and the height of each reinforced pile segment is 2-4 times the outer diameter of the high-strength concrete pipe pile.

7. A construction method for cement-cured composite pile foundations to improve horizontal bearing capacity, characterized in that, Includes the following steps, First, the silt solidification reinforcement is constructed by using a powerful mixing head to vertically mix and spray solidification material to form a silt solidification reinforcement in the soil layer. The upper end of the silt solidification reinforcement is flush with or close to the mud surface. Second, before the initial setting of the silt solidification reinforcement, prestressed high-strength concrete pipe piles are inserted into the silt solidification reinforcement. The lower end of the prestressed high-strength concrete pipe pile passes through the silt solidification reinforcement and is inserted into the soil layer below the silt solidification reinforcement.

8. A construction method for cement-cured composite pile foundations to improve horizontal bearing capacity, characterized in that, Includes the following steps, First, construct a silt solidification reinforcement body by using a high-pressure jet grouting pile machine or a cement-soil mixing pile machine to sequentially construct several interlocking high-pressure jet grouting piles or several cement-soil mixing piles in the soil layer to form a silt solidification reinforcement body in the soil layer. The upper end of the silt solidification reinforcement body is flush with or close to the mud surface. Second, before the initial setting of the silt solidification reinforcement, prestressed high-strength concrete pipe piles are inserted into the silt solidification reinforcement. The lower end of the prestressed high-strength concrete pipe pile passes through the silt solidification reinforcement and is inserted into the soil layer below the silt solidification reinforcement.

9. A construction method for cement-cured composite pile foundations to improve horizontal bearing capacity, characterized in that, Includes the following steps, First, construct the silt solidification reinforcement body. Use a high-pressure jet grouting pile machine to construct at least two reinforcement pile segments in the soil layer from bottom to top to form a silt solidification reinforcement body in the soil layer. Each reinforcement pile segment includes at least two interlocking high-pressure jet grouting pile segments. The upper end of the uppermost reinforcement pile segment is flush with or close to the mud surface. Second, before the initial setting of the silt solidification reinforcement, prestressed high-strength concrete pipe piles are inserted into the silt solidification reinforcement. The prestressed high-strength concrete pipe piles pass through each reinforcement pile segment from top to bottom, and the lower end of the prestressed high-strength concrete pipe piles is inserted into the soil layer below the silt solidification reinforcement.

10. A construction method for cement-cured composite pile foundations to improve horizontal bearing capacity, characterized in that, Includes the following steps, First, the silt is solidified and reinforced. At least two reinforced pile segments are constructed in the soil layer from bottom to top using a high-pressure jet grouting machine. Each reinforced pile segment consists of one high-pressure jet grouting pile segment. The upper end of the uppermost reinforced pile segment is flush with or close to the mud surface. Two interlocking pile segments are constructed between any two adjacent reinforced pile segments, which are evenly distributed around the circumference of the reinforced pile segments. The interlocking pile segments connect the corresponding two adjacent reinforced pile segments into one. Second, before the initial setting of the silt solidification reinforcement, prestressed high-strength concrete pipe piles are passed through each reinforcement pile segment from top to bottom, with the lower end of the prestressed high-strength concrete pipe pile inserted into the soil layer below the silt solidification reinforcement.

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