Drainage plate-prefabricated concrete bamboo pile composite structure for reinforcing soft soil foundation
By using a composite structure that wraps bamboo piles with plastic drainage boards and fills them with concrete cores, the problem of insufficient drainage capacity of bamboo materials is solved, achieving efficient reinforcement and stability improvement of soft soil foundations. The materials are environmentally friendly and inexpensive.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-12
- Publication Date
- 2026-04-03
AI Technical Summary
Existing bamboo materials have weak drainage capacity in soft soil foundation treatment, which cannot meet the requirements for pore water drainage, and the construction cost of traditional vertical piles is high.
A composite structure of drainage board and precast concrete bamboo piles is adopted. By wrapping the bamboo piles with plastic drainage boards and setting conical sleeves below, and filling the inside of the bamboo with concrete core, an integrated structure of drainage and reinforcement is formed.
It improves the drainage capacity of soft soil foundations, enhances the stability and bearing capacity of the foundation, reduces construction costs, and the materials are environmentally friendly and renewable.
Smart Images
Figure CN224078128U_ABST
Abstract
Description
Technical Field
[0001] This utility model belongs to the field of foundation engineering, and particularly relates to a soft soil foundation reinforcement structure. Background Technology
[0002] Soft soil is a special soil type widely distributed in my country. However, soft soil foundations have high water content and weak cementation between soil particles, resulting in slow soil consolidation. Sand wells, bagged sand wells, and vertical piles such as sand piles and gravel piles can accelerate foundation drainage and consolidation, but their pile strength is not high and their construction cost is relatively high.
[0003] Bamboo, as a renewable resource, possesses excellent mechanical properties and environmental characteristics, and has a long history of cultivation and utilization in my country. The sustainability and natural, green, organic characteristics of bamboo have led to its widespread application in the construction industry. The advantages of bamboo structures include convenient construction, quick installation, short construction period, and low cost, making them particularly suitable for projects requiring reduced building energy consumption. When using bamboo for soft soil foundation treatment, the internal grouting of concrete can significantly improve the strength and bearing capacity of bamboo piles, and bamboo treatment for soft soil foundations also offers the advantage of low construction costs. However, bamboo has a relatively weak drainage capacity, which cannot meet the requirements for pore water drainage in soft soil foundations; therefore, there is an urgent need to improve the drainage capacity of bamboo. Utility Model Content
[0004] 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 a drainage board-precast concrete bamboo pile composite structure for soft soil foundation reinforcement with good drainage and reinforcement effect.
[0005] To solve the above-mentioned technical problems, the technical solution proposed by this utility model is as follows:
[0006] A drainage board-precast concrete bamboo pile composite structure for soft soil foundation reinforcement includes bamboo piles and a drainage board fixedly wrapped around the bamboo piles. The bamboo piles are filled with a concrete core, and the lower end of the bamboo piles is provided with a conical sleeve to facilitate pile driving. The bamboo piles and the drainage board are fitted into the conical sleeve.
[0007] In the aforementioned drainage board-precast concrete bamboo pile composite structure, preferably, the inner cavity of the bamboo pile is a hollow structure with only the bottom inner bamboo node retained and the other inner bamboo nodes removed, and the concrete core is filled in the hollow structure. Retaining the bottom inner bamboo node and removing the other bamboo nodes makes the inner cavity of the bamboo pile smooth, while the bottom inner bamboo node provides support and sealing. Concrete can be directly poured into the bamboo pile to form the concrete core, eliminating the need for a formwork.
[0008] In the aforementioned drainage board-precast concrete bamboo pile composite structure, preferably, the conical sleeve includes an inverted conical portion and a cylindrical sleeve located above the inverted conical portion. The bamboo pile and the drainage board are adhesively fitted into the cylindrical sleeve. The conical sleeve can be a metal sleeve; when a metal sleeve is used, the inverted conical portion can also be filled with concrete. The inverted conical portion facilitates driving the bamboo pile and drainage board into the soft soil foundation, serving as a guide for the pilot hole. The cylindrical sleeve serves to fix the drainage board and bamboo pile, thus ensuring the integrity of the drainage board and bamboo pile and preventing separation during pile driving. The bamboo pile and drainage board can be adhesively attached to the cylindrical sleeve using epoxy resin adhesive, and the size of the cylindrical sleeve matches the size of the bamboo pile encasing the drainage board.
[0009] In the aforementioned drainage board-precast concrete bamboo pile composite structure, preferably, it further includes multiple bamboo strips. These bamboo strips are vertically arranged on the outer surface of the drainage board, with the lower end of each strip attached to the cylindrical sleeve. The upper end of each strip is flush with the top of the bamboo pile. The multiple bamboo strips are bound together into a single unit using straps. Adding multiple vertical bamboo strips to the outside of the drainage board and binding them together further improves the stability of the drainage board-bamboo pile composite structure. When this composite structure is driven into soft soil, the drainage board is less likely to detach or fold. The number of vertical bamboo strips can be no less than three, for example, four, evenly distributed outside the drainage board. Inserting the lower end of the bamboo strips into the cylindrical sleeve also eliminates the need for binding with straps.
[0010] In the aforementioned drainage board-precast concrete bamboo pile composite structure, preferably, the drainage board is fixedly connected to the outer surface of the bamboo pile using pneumatic nails, and adjacent vertical ends of the drainage board are also fixedly connected using pneumatic nails. The pneumatic nails are driven in using a nail gun, and using pneumatic nails to securely connect the drainage board and bamboo pile is convenient and allows for the use of multiple pneumatic nails for a more robust connection. Furthermore, fixing adjacent vertical ends of the drainage board with pneumatic nails improves overall integrity.
[0011] In the aforementioned drainage board-precast concrete bamboo pile composite structure, preferably, both the inner and outer surfaces of the bamboo piles are coated with an anti-corrosion material layer. The addition of this anti-corrosion material layer helps improve the anti-corrosion performance of the bamboo.
[0012] In the aforementioned drainage board-precast concrete bamboo pile composite structure, the bamboo piles are wrapped with plastic drainage boards. The capillary action of the plastic drainage boards effectively removes pore water from the soft soil foundation, reduces the moisture content in the soil, and improves the bearing capacity of the foundation.
[0013] This utility model's drainage board-precast concrete bamboo pile composite structure consists of three main parts: bamboo piles, plastic drainage boards, and conical sleeves. The bamboo piles, as the main supporting component, utilize bamboo as the raw material. Bamboo possesses high strength and elasticity, and is relatively lightweight, making it suitable for most soft soil foundation projects. The plastic drainage board, by covering the bamboo piles, provides an effective drainage pathway, allowing pore water in the soft soil foundation to drain away, preventing foundation settlement due to excessive moisture. To overcome the potential separation of the plastic drainage board and bamboo piles during pile driving, an additional conical sleeve is added to the end of the composite structure containing the bamboo node. This sleeve is used for static pressure drilling, facilitating the driving of the plastic-covered bamboo pile into the soft soil foundation without damaging the bond between the plastic drainage board and the bamboo pile. This composite structure not only improves the stability of the foundation but also enhances the durability of the bamboo piles themselves, reducing potential physical and chemical corrosion problems during long-term use.
[0014] Bamboo, as an environmentally friendly and sustainable building material, is widely used in soft soil foundation engineering, especially in the bamboo pile composite structure of this utility model. The bamboo should be moso bamboo or other high-quality bamboo species free from severe surface defects such as cracks, insect infestation, mold, or dryness. To ensure the stability and durability of the bamboo piles during long-term use, this utility model uses bamboo that has undergone anti-corrosion treatment. These anti-corrosion measures effectively prevent the bamboo from being damaged by natural environmental factors such as moisture, mold, and insect infestation, extending the service life of the bamboo piles. A concrete core is poured into the bamboo, which can be made of recycled concrete to reduce the consumption of natural resources and lower costs. The pouring of recycled concrete enhances the strength and stability of the bamboo piles, enabling them to withstand greater loads and providing good compressive and bending resistance. The plastic drainage board has excellent drainage performance and compressive strength. Its surface typically has numerous drainage holes, which can quickly guide pore water in the soil to drainage channels or pipes, thereby achieving efficient drainage. Therefore, wrapping bamboo piles with plastic drainage boards to form a drainage layer is an effective way to improve the drainage performance of bamboo pile composite foundations, effectively reducing the risk of liquefaction in soft soil foundations and improving foundation stability. The use of plastic drainage boards, especially in soft soil foundation projects, has significant advantages. This invention, through reasonable design and material selection, achieves a bamboo pile composite structure that meets mechanical performance requirements while also considering environmental protection and economy.
[0015] The construction method of the drainage board-precast concrete bamboo pile composite structure of this utility model may include the following steps:
[0016] Step 1: Hollow out the bamboo sections:
[0017] Perform an external inspection of the bamboo to ensure that there are no cracks, insects, mold or other defects on the surface. Then, keep the bamboo node closest to one end of the bamboo and remove the rest of the bamboo nodes. Clean the inner cavity of the bamboo to ensure its flatness and cleanliness.
[0018] Step 2: Bamboo Preservative Treatment
[0019] Soaking bamboo in running or flowing water for a period of time allows soluble sugars and other nutrients on the surface to dissolve, and fills the cells with free water, creating a low-oxygen environment that is unfavorable to mold growth. This inhibits mold growth and reproduction, thus achieving a preservative effect.
[0020] Step 3: Pile filling:
[0021] The end of the bamboo with the node intact is used as the bottom of the bamboo. A grouting pipe is inserted into the cavity of the bamboo, with the front end of the grouting pipe extending to the bottom of the bamboo. Recycled concrete is then poured in from the bottom to the top of the bamboo, ensuring that the cavity of the bamboo is completely filled with recycled concrete.
[0022] Step 4: Roll up the plastic drainage board:
[0023] Cut the plastic drainage board to the required length and width according to the specifications of the pile. The width of the plastic drainage board is determined by the outer perimeter of the pile and should be greater than the outer perimeter of the pile. The length of the plastic drainage board is determined by the length of the pile. Ensure that the two wide sides of the cut plastic drainage board are flush with the two ends of the pile. Then, wrap the wide sides of the plastic drainage board around the outside of the pile and use a pneumatic nail gun to nail the two wide sides of the plastic drainage board to the pile. At the overlapping part of the long side of the plastic drainage board, use a pneumatic nail gun to fix the plastic drainage board to the bamboo pile as a whole from one end of the pile to the other. It is necessary to ensure that the plastic drainage board is tightly attached to the outer wall of the bamboo pile and is not easy to fall off.
[0024] Step 5: Add a conical sleeve:
[0025] Inspect the wrapped bamboo piles to ensure that the drainage board is wrinkle-free and loose, forming a complete coating layer so that the capillary action of the drainage board can function properly. Then, add an extra conical sleeve to the end of the composite structure formed by the plastic drainage board and bamboo pile that retains the bamboo node. This prevents the plastic drainage board and bamboo pile from separating during pile driving and is used for static pressure drilling, making it easier to drive the plastic drainage board-wrapped bamboo pile into the soft soil foundation without damaging the bonding ability between the plastic drainage board and the bamboo pile.
[0026] Step Six: Drive into the soft soil foundation:
[0027] A composite structure of bamboo piles covered with plastic drainage boards is pressed into the soft soil foundation using static pressure. During construction, it is essential to ensure that the end of the composite structure formed by the plastic drainage board and bamboo piles, with the conical sleeve, is vertically downward. Additionally, the verticality and positioning accuracy of the bamboo piles must be guaranteed. The depth and speed of static pressure are adjusted promptly based on site soil conditions and the size of the bamboo piles to ensure the bamboo piles reach the designed embedment depth. During static pressure, the stability of the bamboo piles is checked regularly to ensure they do not shift or break. After static pressure is completed, the pressed bamboo piles are inspected to ensure their verticality, depth, and stability meet design requirements. Finally, the backfill and surrounding soil are compacted to ensure the overall stability of the bamboo pile composite structure.
[0028] Compared with the prior art, the advantages of this utility model are:
[0029] 1. This utility model's drainage board-precast concrete bamboo pile composite structure, by installing a drainage board on the outside of the bamboo piles, utilizes the capillary action of the drainage board to drain pore water from the top of the bamboo piles in soft soil foundations, thereby improving the drainage capacity of the bamboo pile composite foundation. Simultaneously, the bamboo piles are filled with a concrete core, enhancing their load-bearing capacity. The combination of these two elements achieves both drainage and reinforcement of soft soil foundations, providing a dual function of drainage and load-bearing capacity, and can be widely used for the reinforcement of soft soil foundations. Furthermore, a conical sleeve is installed below the bamboo piles to facilitate driving the bamboo piles into the soft soil foundation.
[0030] 2. The drainage board-precast concrete bamboo pile composite structure of this utility model makes full use of renewable and rapidly growing raw bamboo, and has the advantages of low cost, convenient material sourcing, and green and renewable materials, and has good application prospects and promotion value. Attached Figure Description
[0031] 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.
[0032] Figure 1 This is a schematic diagram of the drainage board-precast concrete bamboo pile composite structure used for soft soil foundation reinforcement in Example 1.
[0033] Figure 2 yes Figure 1 Top view.
[0034] Figure 3 This is a schematic diagram of the drainage board-precast concrete bamboo pile composite structure used for soft soil foundation reinforcement in Example 2.
[0035] Legend:
[0036] 1. Bamboo stake; 2. Drainage board; 3. Concrete core; 4. Conical sleeve; 41. Inverted cone part; 42. Cylindrical sleeve; 5. Bamboo strip; 6. Binding strap. Detailed Implementation
[0037] 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.
[0038] 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.
[0039] 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.
[0040] 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.
[0041] Example 1:
[0042] like Figure 1 and Figure 2 As shown, the drainage board-precast concrete bamboo pile composite structure for soft soil foundation reinforcement in this embodiment includes a bamboo pile 1 and a drainage board 2 fixedly wrapped around the bamboo pile 1. The bamboo pile 1 is filled with a concrete core 3. The lower end of the bamboo pile 1 is also provided with a conical sleeve 4 to facilitate pile driving. The bamboo pile 1 and the drainage board 2 are fitted into the conical sleeve 4.
[0043] In this embodiment, the inner cavity of the 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, and the concrete core 3 is filled in the hollow structure.
[0044] In this embodiment, the conical sleeve 4 includes an inverted conical portion 41 and a cylindrical sleeve 42 located above the inverted conical portion 41. The bamboo stake 1 and the drainage board 2 are glued and fitted into the cylindrical sleeve 42. The conical sleeve 4 can be a metal sleeve.
[0045] In this embodiment, the drainage board 2 is fixedly connected to the outer surface of the bamboo stake 1 by air nails, and the adjacent vertical ends of the drainage board 2 are also fixedly connected by air nails. The air nails can be driven in using an air nail gun.
[0046] In this embodiment, both the inner and outer surfaces of the bamboo stake 1 are coated with a layer of anti-corrosion material.
[0047] In this embodiment, the bamboo pile 1 is made of moso bamboo, with the outer diameter increasing from one end to the other, reaching a maximum of 15-17 cm. The entire bamboo pile is 1 meter long and has a wall thickness of 10 mm. Moso bamboo possesses good mechanical properties and durability, making it suitable for pile foundation structures in foundation treatment. By injecting a concrete core 3 inside the bamboo pile 1, the compressive strength and bearing capacity of the bamboo pile 1 can be significantly improved, meeting the requirements for soft soil foundation treatment. The aforementioned concrete core 3 can be made of recycled concrete, composed of recycled aggregate, recycled powder, cement, water, and other auxiliary materials. The recycled aggregate includes recycled coarse aggregate and recycled fine aggregate, which are obtained from waste concrete after recycling and contain natural crushed stone and fragments with attached old mortar. Recycled powder, as another form of waste concrete resource utilization product, has a particle size and chemical composition similar to fly ash. Recycled micro powder refers to recycled materials with a particle size of less than 75 micrometers, which has excellent filling properties and high cementitious activity.
[0048] In this embodiment, the capillary action of the drainage board 2 effectively removes pore water from the soft soil foundation, reducing the moisture content of the soil and improving the bearing capacity of the foundation. Simultaneously, the addition of the conical sleeve 4 facilitates pile driving.
[0049] In this embodiment, the drainage board 2 tightly wraps around the outer periphery of the bamboo pile 1, forming a new composite cylindrical structure. This structure effectively provides drainage while increasing the stability and bearing capacity of the bamboo pile 1. Therefore, the drainage board-precast concrete bamboo pile composite structure for soft soil foundation reinforcement in this embodiment has good drainage performance, effectively removing pore water from the soft soil foundation, reducing moisture accumulation, thereby improving the stability of the foundation and reducing the risk of liquefaction of the soft soil foundation.
[0050] Example 2:
[0051] like Figure 3 As shown, the drainage board-precast concrete bamboo pile composite structure for soft soil foundation reinforcement in this embodiment has the same basic structure as that in Embodiment 1, with the main differences as follows: Figure 3 As shown, in this embodiment, four bamboo strips 5 are also included. The four bamboo strips 5 are vertically arranged on the outer surface of the drainage board 2. The lower end of the bamboo strips 5 is arranged on the cylindrical sleeve 42, and the upper end of the bamboo strips 5 is flush with the top of the bamboo stake 1. The multiple bamboo strips 5 are tied and fixed into a whole by the binding straps 6.
[0052] 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. A composite structure of drainage board and precast concrete bamboo piles for soft soil foundation reinforcement, characterized in that, Includes a bamboo stake (1) and a drainage board (2) fixedly wrapped around the bamboo stake (1). The bamboo stake (1) is filled with a concrete core (3). The lower end of the bamboo stake (1) is also provided with a conical sleeve (4) to facilitate pile driving. The bamboo stake (1) and the drainage board (2) are fitted into the conical sleeve (4). The conical sleeve (4) includes an inverted conical part (41) and a cylindrical sleeve (42) located above the inverted conical part (41). The bamboo stake (1) and the drainage board (2) are glued and fitted in the cylindrical sleeve (42). It also includes multiple bamboo strips (5), which are vertically arranged on the outer surface of the drainage board (2). The lower end of the bamboo strips (5) is located on the cylindrical sleeve (42), and the upper end of the bamboo strips (5) is flush with the top of the bamboo stake (1). The multiple bamboo strips (5) are tied together as a whole by straps (6).
2. The drainage board-precast concrete bamboo pile composite structure according to claim 1, characterized in that, The inner cavity of the 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, and the concrete core (3) is filled in the hollow structure.
3. The drainage board-precast concrete bamboo pile composite structure according to claim 1, characterized in that, The drainage board (2) is fixedly connected to the outer surface of the bamboo stake (1) by air nails, and the adjacent vertical ends of the drainage board (2) are also fixedly connected by air nails.
4. The drainage board-precast concrete bamboo pile composite structure according to any one of claims 1-3, characterized in that, The inner and outer surfaces of the bamboo stake (1) are coated with a layer of anti-corrosion material.