A precast bamboo pile with cohesiveness for reinforcing soft ground

Abstract

The utility model discloses a kind of for soft weak foundation consolidation's embracing type drainage prefabricated bamboo pile, including reinforcing bamboo pile and drainage bamboo pile, the reinforcing bamboo pile includes a pair of arc-shaped bamboo pile, a pair of the arc-shaped bamboo pile is respectively embraced and attached to the both sides of the drainage bamboo pile, and is integrally connected with the drainage bamboo pile, the cavity surrounded by the inner wall of the arc-shaped bamboo pile and the outer wall of the drainage bamboo pile is filled with reinforcing concrete, drainage hole is arranged on the side of the drainage bamboo pile not covered by the arc-shaped bamboo pile, and drainage sand is filled in the inner cavity of the drainage bamboo pile. The utility model discloses for soft weak foundation consolidation's embracing type drainage prefabricated bamboo pile has the advantages of high integrity, high bearing capacity, efficient drainage etc.

Description

Technical Field

[0001] This utility model belongs to the field of foundation engineering, and particularly relates to a structure for reinforcing weak foundations. Background Technology

[0002] In soft soil foundation reinforcement projects, soft soils such as soft clay, silty soil, and high-moisture-content silty clay are prone to engineering problems such as uneven settlement of buildings and slope slippage due to high pore water pressure, slow consolidation rate, and low bearing capacity. Drainage consolidation has become the core technical approach for this type of foundation reinforcement. Bamboo piles, with their advantages of being renewable, low-cost, easy to construct, and compatible with green infrastructure, are widely used. For example, utility model patent CN222685460U discloses a sleeve-type core concrete-ring sand precast bamboo pile structure for soft soil foundation reinforcement. Because it combines foundation reinforcement and drainage consolidation functions, it is widely used in soft soil foundation projects such as rural infrastructure, riverbank protection, small building foundations, and low-fill roadbeds.

[0003] However, the existing sleeve-nested bamboo piles use direct interlocking of inner and outer piles, which cannot form an effective radial restraint on the inner pile body. The inner and outer piles cannot work together to bear the force, and the structural strength can only be improved by increasing the pile wall thickness and the amount of filler, resulting in redundant waste of materials. At the same time, the inner and outer piles cannot work together to bear the force well, and the pile body has insufficient resistance to splitting and top cracking. Longitudinal cracking is prone to occur during pile driving, resulting in poor pile driving stability.

[0004] Therefore, there is an urgent need to develop a new type of precast bamboo pile structure with advantages such as high integrity, high bearing capacity, efficient drainage, convenient construction, and green economy, so as to meet the reinforcement needs of various soft foundations such as soft soil, silty soil, and silty clay with high water content. 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 a precast bamboo pile for soft foundation reinforcement with advantages such as high integrity, high bearing capacity and efficient drainage.

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

[0007] A precast bamboo pile for reinforcing weak foundations with a clamping drainage system includes reinforcing bamboo piles and drainage bamboo piles. The reinforcing bamboo piles include a pair of arc-shaped bamboo piles, which are clamped and attached to both sides of the drainage bamboo pile and fixed to form a whole. The cavity formed by the inner wall of the arc-shaped bamboo pile and the outer wall of the drainage bamboo pile is filled with reinforcing concrete. Drainage holes are provided on the side of the drainage bamboo pile not covered by the arc-shaped bamboo piles. The inner cavity of the drainage bamboo pile is filled with drainage sand.

[0008] In this invention, a pair of arc-shaped bamboo piles are respectively attached to both sides of the drainage bamboo pile. The pair of arc-shaped bamboo piles are symmetrically arranged, circumferentially attached to but not completely covering the surface of the drainage bamboo pile. The arc-shaped bamboo piles are then fixed to the drainage bamboo pile with sealant and secured with positioning rods. This allows the drainage bamboo pile and the pair of arc-shaped bamboo piles to form a cohesive whole, achieving precise positioning, firm connection, and seepage and leakage prevention. This forms a strongly constrained overall structure, effectively preventing eccentricity, misalignment, radial deformation, and cracking of the reinforced bamboo pile and the drainage bamboo pile. It effectively improves the overall integrity and crack resistance of the pile body, enhances the stability of pile driving, and simplifies construction and assembly, resulting in more stable pile quality.

[0009] In this invention, the cavity formed by the inner wall of the arc-shaped bamboo pile and the outer wall of the drainage bamboo pile is filled with reinforced concrete, which, after curing, forms a rigid core pile that bears the main vertical load and greatly improves the vertical bearing capacity of the pile. Drainage sand is added inside the drainage bamboo pile to drain groundwater and consolidate the soft soil foundation.

[0010] In the above-mentioned prefabricated bamboo piles for drainage, preferably, the inner cavity of the drainage bamboo pile and the arc-shaped bamboo pile is a hollow structure with the bottom closed, retaining only the lowest inner bamboo node and removing the other inner bamboo nodes.

[0011] In the aforementioned prefabricated bamboo piles for drainage, preferably, the drainage bamboo pile has a positioning through hole, and the arc-shaped bamboo pile has a positioning locking hole. The drainage bamboo pile and the arc-shaped bamboo pile are also fixed together by a positioning rod, with the middle part of the positioning rod inserted into the positioning through hole and both ends of the positioning rod locked into the positioning locking holes. The positioning rod further assists in forming a stable overall structure between the drainage bamboo pile and the arc-shaped bamboo pile. Sealant can be filled into the positioning through hole and the positioning locking hole to prevent drainage sand from entering the inner cavity of the arc-shaped bamboo pile and to prevent reinforcing concrete from entering the drainage bamboo pile.

[0012] In the aforementioned prefabricated bamboo piles for drainage, preferably, the arc-shaped bamboo pile is fixed to the surface of the drainage bamboo pile by adhesive. The adhesive fixation ensures the arc-shaped bamboo pile is firmly attached to the surface of the drainage bamboo pile, improving the stability of the pile body.

[0013] In the aforementioned precast bamboo piles for drainage, preferably, the bottom surfaces of the drainage bamboo pile and the pair of arc-shaped bamboo piles are integrally machined with beveled pile tips, and the bottoms of the drainage bamboo pile and the pair of arc-shaped bamboo piles are also wrapped with locking straps. The bottom ends of the drainage bamboo pile and the pair of arc-shaped bamboo piles are cut at the same angle and in the same direction to form integral beveled pile tips. The beveled surface is continuous, smooth, and coaxially guided, and fixed with locking straps, which can significantly reduce the resistance to soil penetration and prevent pile deviation. At the same time, the locking straps form a bottom locking constraint, preventing the arc-shaped bamboo piles from opening outwards during construction.

[0014] In the aforementioned precast bamboo piles for drainage, preferably, the drainage holes on the drainage bamboo piles are arranged in a gradient from top to bottom, with the number of drainage holes increasing from top to bottom, and the diameter of the drainage holes increasing from top to bottom. This arrangement of drainage holes can precisely match the distribution characteristics of soft foundations, where deep pore water pressure is higher and drainage demand is greater, significantly improving the overall drainage consolidation efficiency and settlement uniformity of the foundation. In soft foundations, pore water pressure increases significantly with depth; the lower, deeper soil has high water content and high water pressure, while the upper, shallower soil has low water content and low water pressure. Traditional bamboo piles use uniformly perforated holes throughout the pile body, which easily leads to insufficient drainage capacity in the lower part and an excessive number of ineffective perforations in the upper part: too few perforations in the lower part prevent the timely discharge of deep, high-pressure pore water, resulting in slow consolidation of soft soil; too many perforations in the upper part easily cause surface fine soil particles to flow into the pile body, causing clogging of the drainage holes, while also weakening the structural strength of the upper part of the pile body and reducing overall bearing stability.

[0015] In the above-mentioned prefabricated bamboo piles for drainage, preferably, both the inner and outer surfaces of the reinforcing bamboo piles and the drainage bamboo piles are coated with an anti-corrosion material layer to delay the corrosion, mildew, and degradation of the bamboo and extend the service life of the structure.

[0016] In the aforementioned prefabricated bamboo piles for drainage, preferably, the outer surface of the drainage bamboo pile is covered with non-woven geotextile by binding straps to effectively filter out fine soil particles, prevent fine particles from intruding into the drainage sand layer and causing channel blockage, and ensure long-term drainage effect.

[0017] This utility model discloses a precast bamboo pile with an interlocking drainage design for reinforcing soft foundations. It features a simple structure, easy assembly, and applicability to various soft foundation reinforcement methods. The interlocking precast bamboo pile is constructed using a combination of factory prefabrication and on-site construction. First, the pile body is prefabricated. All bamboo nodes (except the bottom nodes) are removed from the two curved bamboo piles and the internal drainage bamboo pile. The pile is then leveled and treated with anti-corrosion measures. Following the design angle, the bottom ends of the drainage bamboo pile and the two curved bamboo piles are simultaneously cut into unidirectional beveled surfaces, ensuring that the three components form a single, integrated beveled pile tip after assembly. Subsequently, drainage holes with a gradually increasing gradient are machined into the drainage bamboo pile body. The hole diameter increases from small to large and the spacing increases from sparse to dense along the pile body to accommodate the drainage needs of deep soil layers. After drilling, the outer wall of the drainage bamboo pile is fully wrapped with non-woven geotextile using binding straps, ensuring a tight fit between the geotextile and the pile body, achieving water permeability and soil filtration, and guaranteeing long-term unobstructed drainage. Next, two curved bamboo piles are symmetrically joined from both sides, wrapping around but not completely covering the entire surface of the drainage bamboo pile, so that the bottom beveled surfaces of the three are flush and fit together to form a complete pile body. A positioning rod is then installed to position and fix the reinforcement bamboo pile and the drainage bamboo pile, preventing the joint from loosening. After positioning, sealant is evenly applied to the connection between the positioning rod and the pile wall, the joint of the curved bamboo pile, and the joint of the bottom beveled surface to form a full-section sealed structure, preventing mud and water intrusion, grout leakage, and blockage of the drainage channel. During on-site construction, a static pressure pile driver is used to uniformly press the integrally formed joined bamboo pile into the soft foundation. The integrated beveled surface of the pile tip at the bottom provides guidance and resistance reduction, ensuring that the pile is driven straight, not skewed, and not easily split. After the pile body is pressed to the design elevation, cement grout is densely injected into the inner cavity of the curved bamboo pile, vibrated to compact, and cured to the design strength to form a rigid load-bearing core pile. Drainage sand is then filled into the drainage bamboo pile. Finally, the top of the pile is sealed to prevent debris from entering the drainage channel, thus completing the single pile construction.

[0018] Compared with the prior art, the advantages of this utility model are:

[0019] This invention relates to a precast bamboo pile for soft soil foundation reinforcement, featuring a clamping drainage system. Two arc-shaped bamboo piles symmetrically clamp together, wrapping around but not completely covering the entire surface of the drainage bamboo pile, forming a strong, constricted overall structure. This clamping constraint generates circumferential prestress, significantly optimizing material utilization and stress matching. It effectively forms radial constrictions on the drainage bamboo pile from the outside, generating circumferential prestress. The pile body shares the load, eliminating the need to increase pile wall thickness or filler volume to improve strength, achieving high structural performance with minimal material usage. This completely solves the problems of existing sleeve-type structures such as "lack of clamping constraint, poor stress matching, and low material utilization," significantly improving economic efficiency and green, low-carbon performance.

[0020] This utility model relates to a precast bamboo pile for reinforcing soft foundations with a cohesive drainage system. The pile body has good integrity, and the radial clamping force generated by the cohesion effectively resists the soil pressure during pile driving. The resulting integrated structure can effectively prevent the reinforcement bamboo pile and drainage bamboo pile from becoming eccentric, misaligned, radially deformed, or cracked. It can effectively improve the integrity and crack resistance of the pile body, enhance the stability of pile driving, and make the pile quality more stable.

[0021] This utility model relates to precast bamboo piles for reinforcing soft foundations with a cohesive drainage system. The reinforcement and drainage positions can be flexibly arranged according to the stress direction of the roadbed / embankment. In projects with a clear main stress direction, such as roads and embankments, the curved bamboo piles can be oriented towards the side with greater lateral earth pressure, and the drainage holes can be oriented towards the inside of the soil to achieve optimal stress and drainage efficiency.

[0022] This utility model relates to a precast bamboo pile for reinforcing soft foundations, which combines drainage performance with high load-bearing capacity. The reinforcing concrete bears the main vertical load, greatly improving the vertical bearing capacity of the pile, while the drainage sand is used to drain groundwater, thus possessing excellent drainage performance.

[0023] This utility model discloses a precast bamboo pile for soft soil foundation reinforcement, which fully utilizes renewable and rapidly growing raw bamboo. It has advantages such as low cost, convenient material sourcing, and green and renewable materials. At the same time, the construction method of this precast bamboo pile is simple and quick, and the transportation and construction costs are low, which has good application prospects and promotion value. Attached Figure Description

[0024] 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.

[0025] Figure 1 This is a schematic diagram of a prefabricated bamboo pile for reinforcing soft foundations, as shown in the embodiment.

[0026] Figure 2 This is a schematic diagram of the structure of the precast bamboo pile for soft foundation reinforcement, without showing the non-woven geotextile and binding straps, as an example.

[0027] Figure 3 for Figure 1 Top view.

[0028] Figure 4 This is a schematic diagram of the positioning rod in a precast bamboo pile for soft foundation reinforcement, as shown in the embodiment.

[0029] Legend

[0030] 1. Reinforced bamboo piles; 2. Drainage bamboo piles; 3. Reinforced concrete; 4. Drainage sand; 5. Binding straps; 6. Positioning rods; 7. Drainage holes; 8. Non-woven geotextile; 9. Integrated oblique-cut pile tip; 10. Locking straps. Detailed Implementation

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] Example:

[0036] like Figures 1-3 As shown, the precast bamboo piles for soft soil foundation reinforcement in this embodiment include reinforcing bamboo piles 1 and drainage bamboo piles 2. The reinforcing bamboo pile 1 includes a pair of arc-shaped bamboo piles, which are respectively attached to both sides of the drainage bamboo pile 2 and fixed together to form a whole. The cavity formed by the inner wall of the arc-shaped bamboo piles and the outer wall of the drainage bamboo pile 2 is filled with reinforcing concrete 3. Drainage holes 7 are provided on the side of the drainage bamboo pile 2 not covered by the arc-shaped bamboo piles. The inner cavity of the drainage bamboo pile 2 is filled with drainage sand 4. The reinforcing concrete 3 bears the main vertical load, significantly improving the vertical bearing capacity of the pile body. The drainage sand 4 filling the drainage bamboo pile 2 forms a continuous and stable drainage system.

[0037] In this embodiment, the inner cavity of the drainage bamboo pile 2 and the arc-shaped bamboo pile is a hollow structure with the bottom closed, retaining only the bottom inner bamboo node and removing the other inner bamboo nodes. The inner cavity is flat and clean, which facilitates the filling of the filler and the unobstructed drainage channel.

[0038] like Figure 4As shown, in this embodiment, the drainage bamboo pile 2 is provided with a positioning through hole, and the arc-shaped bamboo pile is provided with a positioning locking hole. The drainage bamboo pile 2 and the arc-shaped bamboo pile are also fixed by a positioning rod 6. The middle part of the positioning rod 6 is inserted into the positioning through hole, and both ends of the positioning rod 6 are locked in the positioning locking holes. After the positioning rod 6 is installed, sealant can be applied to the positioning through hole and the positioning locking hole to seal the gaps, achieve seepage prevention, leakage prevention, and blockage prevention, and further improve the overall structure.

[0039] In this embodiment, the arc-shaped bamboo pile is fixed to the surface of the drainage bamboo pile 2 by sealing adhesive to form an integral load-bearing structure and improve the load-bearing performance.

[0040] In this embodiment, the bottom surfaces of the drainage bamboo pile 2 and the pair of arc-shaped bamboo piles are integrally machined inclined surface pile tips 9, and the bottoms of the drainage bamboo pile 2 and the pair of arc-shaped bamboo piles are also wrapped with locking straps 10. The inclined surface is smooth and has good guiding properties, which can reduce the resistance to soil penetration and prevent pile deviation and splitting; the bottom is locked with locking straps 10 to further constrain the cohesive structure and improve the overall stability.

[0041] In this embodiment, the drainage holes 7 on the drainage bamboo piles 2 are arranged in a gradient from top to bottom, with the number of drainage holes 7 increasing from top to bottom, and the diameter of the drainage holes 7 increasing from top to bottom. More specifically, in this embodiment, the diameter of the top drainage holes 7 can be 6-8mm, and the center-to-center distance between adjacent drainage holes 7 can be 150-200mm; the diameter of the bottom drainage holes 7 can be 10-12mm, and the center-to-center distance between adjacent drainage holes 7 can be 80-120mm. This can match the drainage needs of different depths in soft foundations and improve drainage consolidation efficiency and uniformity.

[0042] In this embodiment, both the inner and outer surfaces of the reinforcing bamboo pile 1 and the drainage bamboo pile 2 are coated with a layer of anti-corrosion material, such as tung oil, ACQ, CCA, asphalt, etc., and are coated 2-3 times to improve the anti-corrosion and anti-mildew properties of the bamboo and extend the service life of the structure.

[0043] In this embodiment, the outer surface of the drainage bamboo pile 2 is covered with non-woven geotextile 8 by binding straps 5, which completely covers the area where the drainage hole 7 is located, and plays the role of filtering soil, preventing blockage, protecting the drainage channel, and ensuring stable long-term drainage effect.

[0044] The precast bamboo piles for soft foundation reinforcement in this embodiment are prefabricated in the factory and constructed on-site using static pressure: First, the bamboo is de-noded, dried, drilled, protected against corrosion, wrapped with non-woven geotextile, assembled, and sealed. Then, the pile body is pressed into the soft foundation at a uniform speed to the design elevation using static pressure equipment. Cement is then poured in, drainage sand is filled, and the top of the pile is then sealed.

[0045] This embodiment makes full use of green and renewable bamboo materials, which are convenient to obtain, low in cost, and easy to construct. Through designs such as cohesive constraint, gradient drainage, sealing protection, and integrated pile tip, the pile body has the dual functions of efficient drainage and high bearing capacity. The integrity, splitting resistance, shear resistance, and anti-slip resistance are significantly improved. The integrated inclined pile tip 9 makes pile driving smoother and reduces construction disturbance. The gradient drainage hole 7 can accelerate the foundation consolidation rate. It is suitable for various soft foundation reinforcement projects such as soft soil, silty soil, and high water content silty clay. It is green, environmentally friendly, and economical, and has good prospects for promotion and application.

[0046] 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 precast bamboo pile for reinforcing soft foundations, characterized in that, The invention includes a reinforcing bamboo pile (1) and a drainage bamboo pile (2). The reinforcing bamboo pile (1) includes a pair of arc-shaped bamboo piles. The pair of arc-shaped bamboo piles are respectively attached to both sides of the drainage bamboo pile (2) and are fixed to the drainage bamboo pile (2) as a whole. The cavity formed by the inner wall of the arc-shaped bamboo pile and the outer wall of the drainage bamboo pile (2) is filled with reinforcing concrete (3). The drainage bamboo pile (2) has drainage holes (7) on the side not covered by the arc-shaped bamboo pile. The inner cavity of the drainage bamboo pile (2) is filled with drainage sand (4).

2. The precast bamboo pile for drainage according to claim 1, characterized in that, The drainage bamboo pile (2) and the arc-shaped bamboo pile have a hollow structure with the bottom closed, retaining only the lowest inner bamboo node and removing the other inner bamboo nodes.

3. The precast bamboo pile for drainage according to claim 1, characterized in that, The drainage bamboo pile (2) is provided with a positioning through hole, and the arc-shaped bamboo pile is provided with a positioning card hole. The drainage bamboo pile (2) and the arc-shaped bamboo pile are also fixed by a positioning rod (6). The middle part of the positioning rod (6) is inserted into the positioning through hole, and the two ends of the positioning rod (6) are locked in the positioning card hole.

4. The precast bamboo pile for drainage according to claim 1, characterized in that, The arc-shaped bamboo stake is fixed to the surface of the drainage bamboo stake (2) by adhesive.

5. The precast bamboo pile for drainage according to claim 1, characterized in that, The bottom surfaces of the drainage bamboo pile (2) and the pair of arc-shaped bamboo piles are integrally cut beveled pile tips (9) obtained by synchronous processing, and the bottom of the drainage bamboo pile (2) and the pair of arc-shaped bamboo piles are also wrapped with locking bands (10).

6. The precast bamboo pile for drainage according to claim 1, characterized in that, The drainage holes (7) on the drainage bamboo stake (2) are arranged in a gradient from top to bottom. The number of drainage holes (7) increases from top to bottom, and the diameter of the drainage holes (7) increases from top to bottom.

7. The precast bamboo pile for drainage according to claim 1, characterized in that, The inner and outer surfaces of the reinforced bamboo pile (1) and the drainage bamboo pile (2) are coated with a layer of anti-corrosion material.

8. The precast bamboo pile for drainage according to claim 1, characterized in that, The outer surface of the drainage bamboo pile (2) is covered with non-woven geotextile (8) by binding straps (5).

Images