Method of construction of a composite pile foundation structure

Abstract

This invention discloses a construction method for a composite pile foundation structure, belonging to the field of pile foundations. The construction method includes: Step 1: Construction positioning and determining structural dimensions; Step 2: Construction site clearing and excavation of the construction pit; Step 3: Construction of the pipe body according to the positioning; Step 4: Construction of fixing components to fix the position of the pipe body; Step 5: Erecting formwork and pouring filling material; Step 6: Removing and recovering the formwork and backfilling the pit. This construction method enables the load of the superstructure to be transferred to a deeper, more resilient soil layer. While meeting the requirements for bearing capacity and settlement, it overcomes the difficulties and dangers of construction caused by complex terrain and steep slopes, thereby improving construction efficiency and saving time and construction costs.

Description

Technical Field

[0001] This invention relates to the field of pile foundations, and in particular to a construction method for a composite pile foundation structure. Background Technology

[0002] A pile foundation refers to a deep foundation consisting of piles and pile caps connecting the pile tops, or a single pile foundation consisting of a column connected to the pile foundation. The conventional pile foundation construction process includes drilling, cleaning the hole, lowering the reinforcing cage, pouring concrete, and inspecting the quality of the completed pile. Among these, drilling, cleaning the hole, lowering the reinforcing cage, and pouring concrete all require large machinery, and the reinforcing cage is huge and difficult to transport.

[0003] In complex and steep terrain, the lack of a working platform makes it impossible to use large machinery for construction, and it is also difficult to transport large steel cages to the site. Therefore, the pile foundation construction is difficult and dangerous, resulting in low construction efficiency and requiring a lot of time and construction costs. Summary of the Invention

[0004] The purpose of this invention is to at least solve one of the technical problems existing in the prior art. To this end, this invention proposes a construction method for a combined pile foundation structure, which can replace the conventional pile foundation construction method in the case of complex terrain and steep slopes, and solves the problems of difficulty in transporting large pile foundation steel cages and lack of working platform for large machinery.

[0005] A construction method for a composite pile foundation structure according to an embodiment of the present invention includes:

[0006] Step 1: Draw construction drawings, combine topographic maps and positioning systems to determine the construction location of the structure, and determine the structural dimensions based on the construction drawings;

[0007] Step 2: Clear the site for construction and excavate the foundation pit within the determined construction location area;

[0008] Step 3: In the foundation pit, a number of pipe bodies are pressed into the underground soil layer in sequence using small compaction machinery, so that the pipe bodies are arranged in a circular array to form a composite pile;

[0009] Step 4: Install the fixing components and secure them to several pipe bodies;

[0010] Step 5: Build a formwork along the outside of the composite pile, and pour in the filling material into the formwork to form a filling layer and a protective layer, so that the composite pile, fixing components, filling layer and protective layer form an integral component;

[0011] Step 6: Remove and reclaim the formwork, backfill the excavated foundation pit, and compact the backfill soil.

[0012] The composite pile foundation structure according to embodiments of the present invention has at least the following beneficial effects: a plurality of pipe bodies are inserted into the soil layer, and the composite piles and the filling layer are connected by fixing components to make the composite piles and the filling layer work together. Then, a protective layer is wrapped around the composite piles, the filling layer and the fixing components to form protection, so that the load of the superstructure is transferred to the deep soil layer with stronger bearing capacity. While meeting the requirements of bearing capacity and settlement, it overcomes the problems of construction difficulties and construction dangers caused by complex terrain and steep terrain, thereby improving construction efficiency and saving time and construction costs.

[0013] According to some embodiments of the present invention, in step two, a foundation pit with a diameter of 3m is excavated with the center of the composite pile as the center, and the excavation depth of the foundation pit is 2m.

[0014] According to some embodiments of the present invention, in step two, a support component is provided on the pit wall to prevent the pit wall from collapsing.

[0015] According to some embodiments of the present invention, in step three, the diameter of the tube is between 5 cm and 15 cm.

[0016] According to some embodiments of the present invention, in step three, the diameter of the composite pile is between 80cm and 120cm.

[0017] According to some embodiments of the present invention, in step four, the fixing component includes a plurality of binding parts, which are evenly arranged along the extension direction of a plurality of tubes, and the plurality of binding parts are combined with the plurality of tubes to form a stable structural skeleton.

[0018] According to some embodiments of the present invention, in step four, the distance between two adjacent binding parts is between 0.5m and 1.5m.

[0019] According to some embodiments of the present invention, in step five, the depth of the filling layer buried in the soil layer is between 150cm and 250cm.

[0020] According to some embodiments of the present invention, in step five, the thickness of the protective layer is between 3 cm and 7 cm.

[0021] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0022] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0023] Figure 1 This is a vertical cross-sectional view of the combined pile foundation according to an embodiment of the present invention;

[0024] Figure 2 yes Figure 1Horizontal cross-section view;

[0025] Figure 3 yes Figure 1 A schematic diagram of the construction steps for the construction pipe body and fixing components;

[0026] Figure 4 yes Figure 1 A schematic diagram illustrating the construction steps for setting up templates and supporting components.

[0027] Figure 5 yes Figure 1 A schematic diagram illustrating the construction steps for the filling layer and protective layer in the middle layer;

[0028] Figure 6 yes Figure 5 A schematic diagram of the construction steps for removing the formwork.

[0029] Figure 7 yes Figure 6 A schematic diagram of the construction steps for backfilling the foundation pit;

[0030] Figure 8 yes Figure 1 A schematic diagram of the construction process.

[0031] Figure label:

[0032] Composite pile 100, pipe body 110, cavity 120;

[0033] Fill layer 200;

[0034] Fixing component 300, binding part 310;

[0035] Protective layer 400;

[0036] Soil layer 10, foundation pit 20, support components 30, formwork 40. Detailed Implementation

[0037] This section will describe in detail specific embodiments of the present invention. Preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present invention, but they should not be construed as limiting the scope of protection of the present invention.

[0038] In the description of this invention, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., are based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, a specific orientation structure, or operation. Therefore, they should not be construed as limiting this invention.

[0039] In the description of this invention, "several" means one or more, "more than" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0040] In the description of this invention, unless otherwise explicitly defined, terms such as "set up," "install," and "connect" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this invention in conjunction with the specific content of the technical solution.

[0041] refer to Figures 1 to 8 A combined pile foundation structure according to an embodiment of the present invention is described.

[0042] like Figures 1 to 8 As shown, the construction method of the composite pile foundation structure according to an embodiment of the present invention includes:

[0043] Step 1: Draw construction drawings, combine topographic maps and positioning systems to determine the construction location of the structure, and determine the structural dimensions based on the construction drawings;

[0044] Step 2: Clear the site for construction and excavate the foundation pit within the determined construction location area;

[0045] Step 3: In the foundation pit, a number of pipe bodies are pressed into the underground soil layer in sequence using small compaction machinery, so that the pipe bodies are arranged in a circular array to form a composite pile;

[0046] Step 4: Install the fixing components and secure them to several pipe bodies;

[0047] Step 5: Build a formwork along the outside of the composite pile, and pour in the filling material into the formwork to form a filling layer and a protective layer, so that the composite pile, fixing components, filling layer and protective layer form an integral component;

[0048] Step 6: Remove and reclaim the formwork, backfill the excavated foundation pit, and compact the backfill soil.

[0049] It should be noted that, on the one hand, in conventional pile foundation construction, large steel cages are bulky and difficult to transport in steep and complex terrain. In contrast, the small pipe body 110, as a component of the composite pile 100, is smaller in size and can be transported in complex terrain. On the other hand, in steep and complex terrain, working platforms are very limited. Large steel cages require large machinery for construction, and without sufficient working platforms, large machinery poses significant safety hazards. In contrast, the pipe body 110 can be driven into the soil by hammering or static pressure using only small machinery. Therefore, it overcomes the problems of transportation difficulties, construction difficulties, and construction hazards caused by complex and steep terrain. At the same time, it meets the building's load-bearing requirements while improving construction efficiency and saving time and construction costs.

[0050] In some specific embodiments of the present invention, in step two, a foundation pit 20 with a diameter of 3m is excavated with the center of the combined pile 100 as the center, and the excavation depth of the foundation pit 20 is 2m.

[0051] In some specific embodiments of the present invention, in step two, a support component 30 is provided on the pit wall of the foundation pit 20, and the support component 30 is used to prevent the pit wall of the foundation pit 20 from collapsing.

[0052] In some specific embodiments of the present invention, the diameter of the tube 110 is between 15 cm and 25 cm.

[0053] In some specific embodiments of the present invention, the diameter of the composite pile 100 is between 80cm and 120cm.

[0054] like Figure 1 As shown, several tubes 110 are arranged in a circumferential direction. Specifically, the diameter of the tubes 110 is between 15mm and 25mm, and the diameter of the combined pile 100 formed by the several tubes 110 is between 80cm and 120cm. It should be noted that the diameter of the tube 110 is the radial length from the axis of the tube 110 to the outer wall of the tube 110, and the diameter of the combined pile 100 refers to the farthest radial length from the axis of the circumference formed by the several tubes 110 to the outer wall of the tube 110.

[0055] Specifically, in this embodiment, the diameter of the pipe body 110 is 20mm, and the diameter of the combined pile 100 is 100cm. Furthermore, the thickness of the protective layer 400 is 5cm; therefore, the diameter of the combined pile foundation structure in this embodiment is 110cm.

[0056] In some specific embodiments of the present invention, the fixing component 300 includes a plurality of binding parts 310, which are evenly arranged along the extending direction of a plurality of tubes 110, and the plurality of binding parts 310 and the plurality of tubes 110 are combined to form a stable structural skeleton.

[0057] like Figure 2 As shown, the fixing component 300 includes a plurality of binding parts 310, which are evenly arranged in the vertical direction. Specifically, the binding area of ​​the plurality of binding parts 310 coincides with the filling area of ​​the filling layer 200. Thus, the plurality of binding parts 310 are combined with the plurality of tubes 110 to form a stable structural frame extending in the vertical direction to support the load transmitted downward by the building above.

[0058] In some specific embodiments of the present invention, the distance between two adjacent binding portions 310 is between 0.5m and 1.5m.

[0059] like Figure 2 As shown, a plurality of binding parts 310 are disposed on a plurality of pipe bodies 110, and the plurality of binding parts 310 extend in the vertical direction. The distance between two adjacent binding parts 310 is between 50cm and 150cm. Specifically, in this embodiment, the distance between two adjacent binding parts 310 is 100cm, thereby connecting the independent pipe bodies 110 to form a whole and ensuring the integrity of the composite pile 100.

[0060] Specifically, the pipe body 110 is a threaded welded steel pipe, the filling layer 200 is concrete, and the binding part 310 is a spiral stirrup.

[0061] Specifically, threaded welded steel pipes are not easily deformed, are sturdy and durable, and the threaded appearance can further integrate with concrete, enhancing the overall structure.

[0062] Specifically, concrete has excellent plasticity, strong bonding force, and high compressive strength. It can be used to create buildings and components of various shapes by changing the size and shape of the formwork 40. Furthermore, embedding steel bars in concrete can form an integral structure, thus fully ensuring structural safety.

[0063] Specifically, spiral stirrups are continuous and integral steel reinforcement components. Spiral stirrups exhibit excellent stability, are reliable and sturdy, and can automatically support the skeleton during binding for easy positioning, shortening binding operation time and improving construction efficiency.

[0064] In some specific embodiments of the present invention, the filling layer 200 is buried in the soil layer 10 at a depth between 150cm and 250cm.

[0065] like Figure 2As shown, the filling layer 200 is disposed within the cavity 120 formed by the enclosure of several pipes 110. The bottom depth of the filling layer 200 is greater than the bottom depth of the pipes 110. Specifically, the depth of the filling layer 200 buried in the soil layer 10 is between 150cm and 250cm. In this specific embodiment, the filling layer 200 is buried in the soil to a depth of 200cm to ensure that it can overcome the shear stress on the pipes 110 and prevent deformation or even breakage of the pipes 110 at the junction of the above-ground and underground surfaces.

[0066] It should be noted that the soil around the pipe 110 below 200cm is the existing soil. After several pipes 110 are inserted into the soil layer 10, the stability is good. Therefore, the filling layer 200 is buried in the soil to a depth of 200cm, and the binding area of ​​the binding part 310 corresponds to 200cm.

[0067] In some specific embodiments of the present invention, the thickness of the protective layer 400 is between 3 cm and 7 cm.

[0068] like Figure 1 As shown, the protective layer 400 is set on the curved surface of the composite pile 100 away from the cavity 120. It should be noted that the thickness of the protective layer 400 refers to the minimum length between the outer wall of the protective layer 400 and the outer wall of the pipe body 110, i.e. Figure 1 The radial length from the dashed line to the outer wall of the protective layer 400. Specifically, the thickness of the protective layer 400 is between 3cm and 7cm. In this specific embodiment, the thickness of the protective layer 400 is 5cm to protect the pipes 110 and the fixing components 300, preventing the pipes 110 and the fixing components from being exposed and thus suffering long-term corrosion.

[0069] The construction method of this corrugated pipe shaft structure is described below with a specific embodiment:

[0070] Step 1: Draw construction drawings, combine topographic maps and positioning systems to determine the construction location of the composite pile foundation structure, and determine the dimensions of the composite pile foundation structure based on the construction drawings;

[0071] Step 2: Clear the site for construction. Within the determined construction location, excavate a circular foundation pit 20 with a diameter of 3m, centered on the center of the composite pile 100, within a depth of 2m underground. Steel supports are fixedly installed on the walls of the foundation pit 20 to prevent the walls of the foundation pit 20 from collapsing.

[0072] Step 3: In the foundation pit 20, use small compaction machinery to press 12 threaded welded steel pipes with a specification of Ф200mm×10mm into the underground soil layer 10 in sequence, and make the threaded welded steel pipes form a circumferential array along the thread seam.

[0073] Step 4: Install spiral stirrups. Tie the spiral stirrups vertically to the threaded welded steel pipe. The spiral stirrups and the threaded welded steel pipe form a stable load-bearing skeleton.

[0074] Step 5: Apply release agent to the inside of the steel formwork 40, and build a circular steel formwork 40 along the outside of the composite pile 100. The circular steel formwork uses two semi-circular steel forms, which are fitted around the composite pile 100 along the circumference formed by the composite pile 100. The shortest radial length between the inner wall of the steel formwork 40 and the threaded welded steel pipe in the composite pile 100 is 5cm. Finally, pour concrete into the steel formwork 40 to fill the cavity 120 and the gap between the steel formwork 40 and the composite pile 100, forming a filling layer 200 and a protective layer 400 respectively. The composite pile 100, the fixing component 300, the filling layer 200 and the protective layer 400 are poured together to form an integral component.

[0075] Step 6: Remove and reclaim the semi-circular steel formwork 40, backfill the excavated foundation pit 20, and compact the backfill soil in the foundation pit 20.

[0076] like Figure 1 and Figure 2 As shown, the composite pile 100 is inserted into the soil layer 10. The composite pile 100 includes several pipe bodies 110, all of which are inserted into the soil layer 10. The pipe bodies 110 are evenly arranged along the circumference and enclose a cavity 120. A filling layer 200 is provided in the cavity 120. The filling layer 200 and the pipe bodies 110 form an integral whole to prevent the composite pile 100 formed by the combination of pipe bodies 110 from deforming under the action of lateral shear force. The composite pile 100 is provided with a fixing component 300, which is set on the curved surface of the composite pile 100 away from the cavity 120. The fixing component 300 connects the composite pile 100 and the filling layer 200 to form an integral load-bearing structure, so that the composite pile 100 and the filling layer 200 can work together and play an overall role. A protective layer 400 is provided on the side of the composite pile 100 away from the cavity 120. The protective layer 400 is wrapped around the composite pile 100 in the circumferential direction. The protective layer 400 is used to protect the composite pile 100 and the fixing component 300, prevent the composite pile 100 and the fixing component 300 from environmental erosion, and extend the service life of the composite pile 100 and the fixing component 300.

[0077] Thus, several pipes 110 are inserted into the soil layer 10 to form a composite pile 100. The composite pile 100 is fixed by the fixing component 300 to form a load-bearing frame. The filling layer 200 is filled so that the composite pile 100, the fixing component 300 and the filling layer 200 form an integral component and work together. Then, the protective layer 400 wraps the composite pile 100, the filling layer 200 and the fixing component 300 to form a protection, so that the load of the superstructure is transferred to the deeper soil layer 10 with stronger bearing capacity, thus meeting the requirements for the bearing capacity and settlement of the superstructure.

[0078] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. A construction method for a composite pile foundation structure, characterized in that, include: Step 1: Draw construction drawings, combine topographic maps and positioning systems to determine the construction location of the structure, and determine the structural dimensions based on the construction drawings; Step 2: Clear the site for construction and excavate the foundation pit (20) within the determined construction location area. Step 3: In the foundation pit (20), a number of pipe bodies (110) are pressed into the underground soil layer (10) in sequence using small compaction machinery, so that the pipe bodies (110) are arranged in a circular array to form a composite pile (100), and the pipe bodies (110) are connected to each other to form a whole; Step 4: Install the fixing component (300) and fix the fixing component (300) on a plurality of the pipe bodies (110); Step 5: Build a template (40) along the outside of the combined pile (100), and pour filling material into the template (40) to form a filling layer (200) and a protective layer (400), so that the combined pile (100), the fixing component (300), the filling layer (200) and the protective layer (400) form an integral component; Step 6: Remove and reclaim the formwork (40), backfill the excavated foundation pit (20), and compact the backfill soil in the foundation pit (20); The pipe body (110) is a threaded welded steel pipe, the filling layer (200) is concrete, and the binding part (310) is a spiral stirrup; In step four, the fixing component (300) includes a plurality of binding parts (310), which are evenly arranged along the extension direction of the plurality of tubes (110), and the plurality of binding parts (310) and the plurality of tubes (110) are combined to form a stable structural skeleton.

2. The construction method for the composite pile foundation structure according to claim 1, characterized in that, In step two, a foundation pit (20) with a diameter of 3m is excavated with the center of the combined pile (100) as the center, and the excavation depth of the foundation pit (20) is 2m.

3. The construction method for the composite pile foundation structure according to claim 1, characterized in that, In step two, a support assembly (30) is provided on the pit wall of the foundation pit (20), and the support assembly (30) is used to prevent the pit wall of the foundation pit (20) from collapsing.

4. The construction method for the composite pile foundation structure according to claim 1, characterized in that, In step three, the diameter of the tube (110) is between 5 cm and 15 cm.

5. The construction method for the composite pile foundation structure according to claim 1, characterized in that, In step three, the diameter of the composite pile (100) is between 80cm and 120cm.

6. The construction method for the composite pile foundation structure according to claim 1, characterized in that, In step four, the distance between two adjacent binding parts (310) is between 0.5m and 1.5m.

7. The construction method for the composite pile foundation structure according to claim 1, characterized in that, In step five, the filling layer (200) is buried in the soil layer (10) at a depth between 150cm and 250cm.

8. The construction method for the composite pile foundation structure according to claim 1, characterized in that, In step five, the thickness of the protective layer (400) is between 3 cm and 7 cm.

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