Externally-embedded bamboo pile assembly for soft foundation reinforcement

Abstract

The externally-embedded bamboo pile assembly for reinforcing the soft foundation comprises a first bamboo pile, a second bamboo pile and a bamboo tube, the second bamboo pile is arranged in the first bamboo pile, a plurality of first holes and a plurality of second holes are formed in the first bamboo pile and the second bamboo pile respectively, and the bamboo tube is arranged in the first bamboo pile. The first holes and the second holes are arranged in a one-to-one correspondence manner, the outer ends of the bamboo tubes are arranged in the first holes and do not extend out of the first bamboo pile, and the inner ends of the bamboo tubes are arranged in the second holes and extend into an inner cavity of the second bamboo pile; the externally-embedded bamboo pile assembly further comprises an ejector rod. The externally-embedded bamboo pile assembly has the advantages of being low in cost, convenient to obtain materials, environmentally friendly, capable of synchronously improving the bearing capacity and the pulling resistance of a foundation and the like.

Description

Technical Field

[0001] This utility model belongs to the field of foundation engineering, and in particular relates to a bamboo pile for reinforcing soft foundations. Background Technology

[0002] In civil engineering construction, soft soil is characterized by its loose texture, high porosity, high compressibility, and low shear strength. When used directly as a foundation, it is prone to problems such as uneven settlement, insufficient bearing capacity, and poor pull-out resistance, which seriously threaten the safety and service life of the engineering structure.

[0003] Currently used soft soil foundation reinforcement technologies each have their limitations: the replacement layer method involves a large amount of work and high cost when the soft soil layer is thick; the dynamic compaction method has a significant impact on the surrounding environment due to vibration and is not suitable for highly saturated soft soil; the drainage consolidation method has a long construction period and cannot meet the needs of rapid construction; traditional composite foundation piles (such as reinforced concrete piles, crushed stone piles, etc.) have high material costs, many of which are non-renewable, and some piles have poor compatibility with the foundation soil, resulting in limited pull-out lifting effect.

[0004] With the advancement of ecological protection and low-carbon engineering concepts, the problem of the extensive use of non-renewable materials in traditional technologies is becoming increasingly prominent. Furthermore, in small-scale projects and rural construction, traditional technologies still suffer from challenges such as difficulties in material transportation. Some existing technologies utilize bamboo as load-bearing piles, offering advantages such as low cost, readily available materials, and environmental friendliness. However, traditional bamboo piles often lack sufficient foundation bearing capacity and pull-out resistance. Therefore, there is an urgent need to develop a low-cost, readily available, environmentally friendly soft soil foundation reinforcement technology that can simultaneously improve foundation bearing capacity and pull-out resistance. Utility Model Content

[0005] The technical problem to be solved by this utility model is to overcome the deficiencies and defects mentioned in the background art above, and to provide an externally embedded bamboo pile component for reinforcing weak foundations that is low in cost, easy to obtain materials, environmentally friendly, and can simultaneously improve the bearing capacity and pull-out resistance of the foundation.

[0006] To solve the above-mentioned technical problems, the technical solution proposed by this utility model is as follows:

[0007] An externally embedded bamboo pile assembly for reinforcing weak foundations includes a first bamboo pile, a second bamboo pile, and bamboo tubes. The outer diameter of the second bamboo pile is smaller than the inner diameter of the first bamboo pile. The second bamboo pile is disposed within the first bamboo pile. Both the first and second bamboo piles have multiple first holes and multiple second holes respectively, with the first holes and second holes arranged in a one-to-one correspondence. Multiple bamboo tubes are provided. The outer end of each bamboo tube (i.e., the end closer to the first bamboo pile) is disposed in the first hole and does not extend outward beyond the first bamboo pile. The inner end of each bamboo tube (i.e., the end closer to the second bamboo pile) is disposed in the second hole and extends into the inner cavity of the second bamboo pile. The externally embedded bamboo pile assembly also includes a top rod that acts on the inner end of the bamboo tube to adjust the position of the bamboo tube, so that the outer end of the bamboo tube extends outward beyond the first bamboo pile.

[0008] In the aforementioned externally embedded bamboo pile assembly, preferably, the inner cavity of the first bamboo pile is a hollow structure with the bottom closed, retaining only the lowest inner bamboo node and removing the other inner bamboo nodes; the inner cavity of the second bamboo pile is a hollow structure with all inner bamboo nodes removed. The bottom of the second bamboo pile is located on the lowest inner bamboo node of the first bamboo pile's inner cavity, and the second bamboo pile is located at the center of the first bamboo pile. A concrete bonding layer is provided at the junction of the second bamboo pile and the lowest inner bamboo node of the first bamboo pile's inner cavity. The first bamboo pile retains the lowest inner bamboo node and then removes the other bamboo nodes, which makes the inner cavity of the first bamboo pile smooth, while the lowest inner bamboo node provides support and sealing. The second bamboo pile removes all inner bamboo nodes to ensure good flatness and cleanliness of the inner cavity. The second bamboo pile and the first bamboo pile are fixed together by the concrete bonding layer. This structure firmly combines the first and second bamboo piles into a whole at the lower end, enhancing the structural rigidity and integrity of the assembly's bottom, preventing relative displacement or separation when driven into the soil or under stress, and making the structure of the first and second bamboo piles more stable when driven into the soil.

[0009] In the aforementioned externally embedded bamboo pile assembly, preferably, in the corresponding first and second holes, the second hole is located above the first hole, and the bamboo tube is inclined, with its inner end higher than its outer end. This structure allows the top rod to smoothly push the bamboo tube downwards at an angle, forming a downwardly inclined anchoring arm. This inclined arrangement makes the bamboo tube more evenly stressed when subjected to upward pull-out force, and can more effectively disperse the tensile force to a deeper and more stable soil layer, further improving its pull-out resistance.

[0010] In the aforementioned externally embedded bamboo pile assembly, preferably, both the inner and outer surfaces of the bamboo tube are covered with geotextile fabric to secure the inner and outer ends of the bamboo tube into the second hole and the first hole, respectively. The geotextile fabric acts as a cushion and increases friction, allowing the bamboo tube to be tightly secured in the hole and preventing it from falling off or shifting during transportation and driving.

[0011] In the aforementioned externally embedded bamboo pile assembly, preferably, the outer end of the bamboo tube is sealed and has a downward-facing outward bevel, while the inner end of the bamboo tube is open and has an upward-facing inward bevel. Preferably, the outer diameter of the top rod matches the inner diameter of the second bamboo pile (for example, the outer diameter of the top rod is slightly smaller than the inner diameter of the second bamboo pile), and the lower end of the top rod has a cone angle that matches the inward bevel (for example, the cone angle and the inclination angle of the inward bevel are similar). The sharp design of the outward bevel facilitates the insertion of the bamboo tube into the surrounding soil after it is pushed out, reducing resistance. The matching design of the inward bevel and the cone angle of the top rod allows the lower end of the top rod to be precisely embedded in the inner end of the bamboo tube, applying axial thrust and efficiently converting the downward linear motion into the force of the bamboo tube's oblique motion, ensuring that each bamboo tube can be pushed out smoothly and completely, resulting in a high construction success rate. In addition, the open inner end of the bamboo tube allows concrete to be filled inside the bamboo tube during subsequent concrete grouting, further increasing the anchoring force and bearing capacity.

[0012] Preferably, the aforementioned embedded bamboo pile assembly further includes a positioning rod for positioning the bamboo tube when the embedded bamboo pile assembly is driven into the soil. The outer diameter of the positioning rod is smaller than the inner diameter of the second bamboo pile. By using a positioning rod with an outer diameter smaller than the inner diameter of the second bamboo pile, the positioning rod is pre-inserted into the inner cavity of the second bamboo pile during the driving of the entire bamboo pile assembly into the foundation. This provides axial support to the inner end of the bamboo tube, preventing it from retracting inward or falling out of the hole under the enormous driving impact force, thus ensuring the integrity of the prefabricated structure until driving is complete. Preferably, the difference between the outer diameter of the positioning rod and the inner diameter of the second bamboo pile is the same as the length by which the inner end of the bamboo tube extends into the second bamboo pile before being driven into the soil.

[0013] In the aforementioned embedded bamboo stake assembly, preferably, both the inner and outer surfaces of the first and second bamboo stakes are coated with a layer of anti-corrosion material. The addition of this anti-corrosion material layer helps improve the anti-corrosion performance of the bamboo.

[0014] In the aforementioned externally embedded bamboo pile assembly, preferably, the outer surface of the first bamboo pile is wrapped with geotextile. The geotextile serves to prevent soil from entering the first bamboo pile and the bamboo tube. The geotextile can be thinned to allow the bamboo tube to pierce it and enter the soil. Furthermore, after being driven into the soil, the rough surface of the geotextile increases the coefficient of friction between the pile and the surrounding soil, which is beneficial for improving lateral friction resistance.

[0015] In the aforementioned embedded bamboo pile assembly, preferably, the bottom of the first bamboo pile has a pointed corner. Providing a pointed corner at the bottom of the first bamboo pile facilitates driving the bamboo pile assembly into soft soil.

[0016] This utility model also provides an externally embedded bamboo pile, which is obtained by driving the above-mentioned externally embedded bamboo pile component into the soil and injecting concrete grout. The first bamboo pile, the second bamboo pile and the bamboo tube are filled with reinforcing concrete, and the outer end of the bamboo tube extends outward to the first bamboo pile to form an anchoring structure that expands outward in all directions.

[0017] Compared with the prior art, the advantages of this utility model are:

[0018] 1. This utility model's externally embedded bamboo pile component, through its externally embedded double bamboo pile design and pre-installed ejectable bamboo tubes, allows for component prefabrication in a factory or on-site. During construction, simply drive the component into the foundation, then use a jacking rod to eject the bamboo tubes from the inside, and finally inject grout. This process requires no complex machinery, is simple and quick to construct, and is particularly suitable for rural areas or small-scale projects where equipment access is difficult.

[0019] 2. The externally embedded bamboo pile component of this utility model has a significant reinforcement effect. After the bamboo tube is pushed out and injected with grout to solidify, it forms a radially distributed group of micro anchors with enlarged heads in the soil, which greatly increases the contact area and mechanical interlocking force between the bamboo pile and the surrounding soil, thereby significantly improving the vertical bearing capacity and pull-out bearing capacity of the foundation.

[0020] 3. The externally embedded bamboo pile component of this utility model is green, environmentally friendly, and economical. The main material is bamboo, which is widely available, renewable, and low-carbon. Utilizing the tensile strength of bamboo itself and combining it with the compressive strength of concrete, a composite material pile body is formed, with a cost far lower than that of reinforced concrete piles. Attached Figure Description

[0021] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 This is a schematic diagram of the externally embedded bamboo stake assembly in the embodiment (top rod not shown).

[0023] Figure 2 This is a schematic diagram of the connection between the second bamboo stake and the bamboo tube in the externally embedded bamboo stake assembly of the embodiment.

[0024] Figure 3 This is a schematic diagram of the top rod in the externally embedded bamboo pile assembly of the embodiment.

[0025] Figure 4 This is a schematic diagram of the positioning rod in the externally embedded bamboo stake assembly in the embodiment.

[0026] Figure 5 This is a schematic diagram of the externally embedded bamboo stake in the embodiment.

[0027] Legend

[0028] 1. First bamboo stake; 11. Sharp corner; 2. Second bamboo stake; 3. First hole; 4. Bamboo tube; 5. Reinforcing concrete; 6. Second hole; 100. Top rod; 1001. Conical angle; 200. Positioning rod. Detailed Implementation

[0029] To facilitate understanding of this utility model, it will be described more comprehensively and in detail below with reference to the accompanying drawings and preferred embodiments. However, the scope of protection of this utility model is not limited to the following specific embodiments.

[0030] It should be noted that when a component is described as being "fixed to, attached to, connected to or connected to" another component, it can be directly fixed to, attached to, connected to or connected to the other component, or it can be indirectly fixed to, attached to, connected to or connected to the other component through other intermediate connectors.

[0031] Unless otherwise defined, all technical terms used herein have the same meaning as commonly understood by those skilled in the art. The technical terms used herein are for the purpose of describing particular embodiments only and are not intended to limit the scope of protection of this invention.

[0032] Unless otherwise specified, all raw materials, reagents, instruments and equipment used in this invention can be purchased from the market or prepared by existing methods.

[0033] Example:

[0034] like Figures 1-2 As shown, the externally embedded bamboo pile assembly for reinforcing weak foundations in this embodiment includes a first bamboo pile 1, a second bamboo pile 2, and a bamboo tube 4. The outer diameter of the second bamboo pile 2 is smaller than the inner diameter of the first bamboo pile 1. The second bamboo pile 2 is disposed in the first bamboo pile 1. The first bamboo pile 1 and the second bamboo pile 2 are respectively provided with multiple first holes 3 and multiple second holes 6. The first holes 3 and the second holes 6 are arranged in a one-to-one correspondence. Multiple bamboo tubes 4 are provided. The outer end of the bamboo tube 4 is disposed in the first hole 3 and does not extend outward to the outside of the first bamboo pile 1. The inner end of the bamboo tube 4 is disposed in the second hole 6 and extends into the inner cavity of the second bamboo pile 2. The externally embedded bamboo pile assembly also includes a top rod 100 that acts on the inner end of the bamboo tube 4 to adjust the position of the bamboo tube 4 so that the outer end of the bamboo tube 4 extends outward to the outside of the first bamboo pile 1.

[0035] In this embodiment, the inner cavity of the first bamboo stake 1 is a hollow structure with the bottom closed, retaining only the lowest inner bamboo node and removing the other inner bamboo nodes. The inner cavity of the second bamboo stake 2 is a hollow structure with all inner bamboo nodes removed. The bottom of the second bamboo stake 2 is located on the lowest inner bamboo node of the inner cavity of the first bamboo stake 1. The second bamboo stake 2 is located at the center of the first bamboo stake 1. A concrete bonding layer is provided at the junction of the second bamboo stake 2 and the lowest inner bamboo node of the inner cavity of the first bamboo stake 1 to ensure that the lower ends of the two are connected as one.

[0036] In this embodiment, the first hole 3 and the second hole 6 are arranged in a one-to-one correspondence. The second hole 6 is located above the first hole 3. The bamboo tube 4 is arranged at an angle, with the inner end of the bamboo tube 4 being higher than the outer end. The angle between the bamboo tube 4 and the horizontal plane is preferably 30-45 degrees.

[0037] In this embodiment, both the inner and outer surfaces of the bamboo tube 4 are covered with geotextile fabric for securing the inner and outer ends of the bamboo tube 4 into the second hole 6 and the first hole 3, respectively.

[0038] In this embodiment, the outer end of the bamboo tube 4 is sealed and has an outward bevel facing downwards, while the inner end of the bamboo tube 4 is open and has an inward bevel facing upwards.

[0039] like Figure 3 As shown, in this embodiment, the outer diameter of the top rod 100 is slightly smaller than the inner diameter of the second bamboo stake 2, so as to facilitate the subsequent pulling out of the top rod 100. The lower end of the top rod 100 is provided with a cone angle 1001 to match the inner inclined opening.

[0040] like Figure 4 As shown, in this embodiment, a positioning rod 200 is also included for positioning the bamboo tube 4 when the externally embedded bamboo pile assembly is driven into the soil. The outer diameter of the positioning rod 200 is smaller than the inner diameter of the second bamboo pile 2.

[0041] In this embodiment, both the inner and outer surfaces of the first bamboo stake 1 and the second bamboo stake 2 are coated with an anti-corrosion material layer. The choice of anti-corrosion material is not limited; for example, tung oil can be used.

[0042] In this embodiment, the outer surface of the first bamboo pile 1 is wrapped with geotextile, and the bottom of the first bamboo pile 1 is provided with a pointed corner 11.

[0043] like Figure 5 As shown, this embodiment also provides an externally embedded bamboo pile, which is obtained by driving the above-mentioned externally embedded bamboo pile component into the soil and injecting concrete grout. The first bamboo pile 1, the second bamboo pile 2 and the bamboo tube 4 are filled with reinforcing concrete 5. The outer end of the bamboo tube 4 extends outward to the first bamboo pile 1 to form an anchoring structure that expands outward in all directions.

[0044] The construction and working principle of this embodiment are as follows:

[0045] Prefabrication and Assembly: Prefabricate the components according to the above structure and assemble them to form a structure as shown above. Figure 1 The externally mounted bamboo stake assembly is shown. During assembly, the positioning rod 200 can be pre-inserted into the inner cavity of the second bamboo stake 2 to provide support for the inner end of the bamboo tube 4.

[0046] Driving into the foundation: Vertically align the assembled external bamboo pile assembly with the preset pile position in the soft foundation, and use a hammer or pressing device to drive the entire assembly into the designed depth through the force transmission pad at the top of the first bamboo pile 1. During the driving process, the positioning rod 200 prevents the bamboo tube 4 from shrinking inward due to impact.

[0047] Pushing out bamboo tube 4: After driving it into place, pull out the positioning rod 200. Insert the push rod 100 from the top of the second bamboo pile 2, and its lower cone angle 1001 will align and lock into the inner oblique opening of the lower bamboo tube 4 one by one. Continue to press down or hammer the push rod 100, and the axial force of the push rod 100 will be converted into a radial thrust on the bamboo tube 4 through the cone surface, pushing the bamboo tube 4 obliquely out along its axial direction, so that its sharp outer end pierces into the surrounding soil.

[0048] Grouting and Molding: After all bamboo tubes 4 are pushed out, pull out the top rod 100 and inject concrete grout into the inner cavity of the second bamboo pile 2. After the grout fills the inner cavity of the second bamboo pile 2, it flows into the interior of each bamboo tube 4 through the inner end of the opening of the bamboo tube 4, and flows into the interior of the first bamboo pile 1 through the second hole 6 (if the interior of the first bamboo pile 1 is not filled or the filling amount is insufficient, concrete grout can be directly injected into the first bamboo pile 1) until it is full. After the grout solidifies, a core pile body is formed in the first bamboo pile 1 and the second bamboo pile 2, and radially distributed anchor bodies are formed in the bamboo tubes 4. Finally, it combines with the first bamboo pile 1 and the second bamboo pile 2 to form a composite reinforced pile body with multi-directional radial anchor arms (e.g., Figure 5 As shown in the figure, this greatly improves the bearing capacity and pull-out resistance of the foundation.

[0049] The externally embedded bamboo piles in this embodiment interlock tightly with the foundation soil, significantly improving the foundation's bearing capacity and pull-out resistance. This structure is suitable for various soft foundations such as silt, silty clay, and loose sand layers, and is particularly suitable for small-scale projects and rural construction. Construction requires no large equipment, the materials are readily available and environmentally friendly, and the reinforcement effect is stable and reliable.

[0050] The above description is merely a preferred embodiment of this utility model and is not intended to limit the utility model. Various modifications and variations can be made to this utility model by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this utility model should be included within the protection scope of this utility model.

Claims

1. An externally embedded bamboo pile assembly for reinforcing weak foundations, characterized in that, The assembly includes a first bamboo stake (1), a second bamboo stake (2), and a bamboo tube (4). The outer diameter of the second bamboo stake (2) is smaller than the inner diameter of the first bamboo stake (1). The second bamboo stake (2) is located in the first bamboo stake (1). The first bamboo stake (1) and the second bamboo stake (2) are respectively provided with multiple first holes (3) and multiple second holes (6). The first holes (3) and the second holes (6) are arranged in a one-to-one correspondence. The bamboo tube (4) is provided with multiple tubes. The outer end of the bamboo tube (4) is located in the first hole (3) and does not extend outward to the outside of the first bamboo stake (1). The inner end of the bamboo tube (4) is located in the second hole (6) and extends into the inner cavity of the second bamboo stake (2). The externally embedded bamboo stake assembly also includes a top rod (100) that acts on the inner end of the bamboo tube (4) to adjust the position of the bamboo tube (4) so ​​that the outer end of the bamboo tube (4) extends outward to the outside of the first bamboo stake (1).

2. The externally embedded bamboo stake assembly according to claim 1, characterized in that, The inner cavity of the first bamboo stake (1) is a hollow structure with the bottom closed, retaining only the lowest inner bamboo node and removing the other inner bamboo nodes. The inner cavity of the second bamboo stake (2) is a hollow structure with all inner bamboo nodes removed. The bottom of the second bamboo stake (2) is located on the lowest inner bamboo node of the inner cavity of the first bamboo stake (1). The second bamboo stake (2) is located at the center of the first bamboo stake (1). A concrete bonding layer is provided at the junction of the second bamboo stake (2) and the lowest inner bamboo node of the inner cavity of the first bamboo stake (1).

3. The externally embedded bamboo stake assembly according to claim 1, characterized in that, In the first hole (3) and the second hole (6) that are set in a one-to-one correspondence, the second hole (6) is located above the first hole (3), the bamboo tube (4) is set at an angle, and the inner end of the bamboo tube (4) is higher than the outer end.

4. The externally embedded bamboo stake assembly according to claim 1, characterized in that, The inner and outer surfaces of the bamboo tube (4) are covered with geotextile fabric for securing the inner and outer ends of the bamboo tube (4) into the second hole (6) and the first hole (3), respectively.

5. The externally embedded bamboo stake assembly according to claim 1, characterized in that, The outer end of the bamboo tube (4) is sealed and has an outward oblique opening facing downwards. The inner end of the bamboo tube (4) is open and has an inward oblique opening facing upwards.

6. The externally embedded bamboo stake assembly according to claim 5, characterized in that, The outer diameter of the top rod (100) matches the inner diameter of the second bamboo stake (2), and the lower end of the top rod (100) is provided with a cone angle (1001) for matching the inner oblique opening.

7. The externally embedded bamboo stake assembly according to claim 1, characterized in that, It also includes a positioning rod (200) for positioning the bamboo tube (4) when the externally embedded bamboo pile assembly is driven into the soil, the outer diameter of the positioning rod (200) being smaller than the inner diameter of the second bamboo pile (2).

8. The externally embedded bamboo stake assembly according to claim 1, characterized in that, The inner and outer surfaces of the first bamboo stake (1) and the second bamboo stake (2) are coated with a layer of anti-corrosion material.

9. The externally embedded bamboo stake assembly according to claim 1, characterized in that, The outer surface of the first bamboo stake (1) is wrapped with geotextile.

10. The externally embedded bamboo stake assembly according to claim 1, characterized in that, The bottom of the first bamboo stake (1) is provided with a sharp corner (11).

Images