Glass fiber reinforced liquid solidified soil water stop support pile and construction method thereof

Abstract

The invention discloses a glass fiber reinforced liquid solidified soil water stop support pile and a construction method thereof, and relates to the field of civil engineering, the glass fiber reinforced liquid solidified soil water stop support pile comprises a liquid solidified soil pile, and a glass fiber reinforced part is mounted on the inner wall of the liquid solidified soil pile; according to the glass fiber reinforced liquid solidified soil water-stop support pile and the construction method thereof, through the arrangement of the glass fiber reinforcements, the reinforcements are glass fiber reinforcement cages or corrugated plates prefabricated in factories, traditional reinforcement materials are replaced, the self weight of the structure is greatly reduced, transportation and hoisting construction are facilitated, meanwhile, the problem of corrosion of the reinforcements is avoided, and the construction efficiency is improved. Through the synergistic effect of the liquid solidified soil pile body and the glass fiber reinforcement part, the reinforcement part is inserted when the pile body is preliminarily formed and still has flowability, the pile body is lowered to the designed elevation by means of self weight, and the integrity, bending resistance and shearing resistance of the pile body are enhanced; therefore, better structural stability and lateral pressure resistance are realized.

Description

Technical Field

[0001] This invention relates to civil engineering technology, specifically to glass fiber reinforced liquid-solidified soil water-stopping support piles and their construction methods. Background Technology

[0002] In the field of civil engineering, foundation pit support technology, as a key link to ensure the safety of underground engineering construction and the stability of the surrounding environment, has always been a hot topic of industry research. With the acceleration of urbanization and the growth of demand for underground space development, foundation pit support structures not only need to have sufficient strength and stability, but also need to adapt to complex and ever-changing geological conditions and environmental protection requirements. Traditionally, reinforced concrete mixing piles have been widely used due to their wide availability of materials and mature construction technology. This technology forms a support structure with certain bearing capacity and water-stopping performance through the composite action of cement soil and steel cage. However, with the continuous improvement of engineering technology requirements, especially in corrosive soil environments or projects with higher requirements for construction efficiency and environmental protection, traditional reinforced concrete mixing piles have gradually exposed their inherent limitations.

[0003] However, a significant problem facing traditional reinforced concrete mixing piles is the corrosion of the reinforcing steel. In soil environments with high water content or corrosive conditions, the reinforcing cage is highly susceptible to electrochemical corrosion, leading to a decrease in structural strength, a shortened service life, and even safety accidents. Although the corrosion process can be slowed down by adding anti-corrosion coatings or using weathering steel, these methods not only increase costs but also fail to fundamentally solve the long-term durability problem of reinforcing steel in harsh environments. In addition, traditional reinforcing cages are heavy and prone to deformation during hoisting, affecting construction accuracy and efficiency. Furthermore, they require extensive mechanical crushing during dismantling, generating noise and dust pollution, which is inconsistent with the current concept of green construction. Therefore, improvements are needed. Summary of the Invention

[0004] The purpose of this invention is to provide glass fiber reinforced liquid-cured soil water-stopping support piles and their construction methods to solve the problem of insufficient structural durability of traditional reinforced concrete mixing piles in the prior art due to steel corrosion.

[0005] To achieve the above objectives, the present invention provides the following technical solution: a glass fiber reinforced liquid-solidified soil water-stopping support pile, comprising a liquid-solidified soil pile, wherein a glass fiber reinforcement is installed on the inner wall of the liquid-solidified soil pile, and the glass fiber reinforcement is one of a glass fiber steel cage and a glass fiber corrugated plate.

[0006] The construction method of glass fiber reinforced liquid-solidified soil water-stopping support piles includes the following steps:

[0007] S1: Use a mixing pile drilling rig to form holes at the predetermined pile location;

[0008] S2: Liquid solidified soil material is injected into the pile hole through the high-pressure jetting system of the mixing pile drilling rig, and the liquid solidified soil pile body is formed by the mixing action of the drill bit.

[0009] S3: Insert glass fiber reinforcement into the liquid-solidified soil pile.

[0010] Furthermore, in step S3, after the liquid-cured soil pile has been initially formed, the glass fiber reinforcement is inserted into it.

[0011] Furthermore, in step S3, a lifting device is used to hoist the glass fiber reinforcement and lower it to a predetermined position by its own weight.

[0012] Furthermore, in step S1, the mixing pile drilling rig is one of a single-axis mixing pile machine and a three-axis mixing pile machine.

[0013] Furthermore, the glass fiber reinforcement is one of a glass fiber reinforced steel cage and a glass fiber corrugated plate prefabricated in a factory.

[0014] Furthermore, the construction method is used to construct a water-stop curtain for foundation pit engineering.

[0015] Compared with the prior art, the glass fiber reinforced liquid solidified soil water-stop support pile and its construction method provided by the present invention, through the setting of glass fiber reinforcement, the reinforcement adopts factory prefabricated glass fiber steel cage or corrugated plate to replace traditional steel reinforcement materials, which greatly reduces the self-weight of the structure, facilitates transportation and hoisting construction, and avoids the problem of steel corrosion, thereby improving the durability and construction convenience of the support structure.

[0016] Through the synergistic effect of liquid-solidified soil pile and glass fiber reinforcement, the reinforcement is inserted when the pile is still fluid in its initial formation. It is then lowered to the design elevation by its own weight, which enhances the integrity, bending and shear resistance of the pile, thereby achieving better structural stability and lateral pressure resistance.

[0017] By integrating the drilling of mixing piles with high-pressure injection of liquid solidified soil, and combining it with the rapid insertion of glass fiber reinforced components, efficient and continuous construction of water-stop support piles has been achieved, shortening the construction period, reducing manual intervention, and thus improving construction efficiency and the controllability of project quality.

[0018] The cutability and lightweight properties of fiberglass materials make the support piles easier to mechanically break during later dismantling, and some materials can be recycled, reducing construction waste and resource waste. This demonstrates good environmental protection and economy, and is particularly suitable for temporary foundation pit projects. Attached Figure Description

[0019] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this invention. For those skilled in the art, other drawings can be obtained based on these drawings.

[0020] Figure 1 This is one of the overall structural schematic diagrams provided in the embodiments of the present invention;

[0021] Figure 2 This is one of the schematic diagrams of a glass fiber reinforced component structure provided in an embodiment of the present invention;

[0022] Figure 3 This is the second overall structural schematic diagram provided for an embodiment of the present invention;

[0023] Figure 4 This is a second schematic diagram of a glass fiber reinforced component structure provided in an embodiment of the present invention;

[0024] Figure 5 A flowchart of the construction method provided in an embodiment of the present invention.

[0025] Explanation of reference numerals in the attached figures:

[0026] 1. Liquid solidified soil pile; 2. Glass fiber reinforced component. Detailed Implementation

[0027] To enable those skilled in the art to better understand the technical solution of the present invention, the present invention will be further described in detail below with reference to the accompanying drawings.

[0028] As attached Figure 1 To be continued Figure 5 As shown:

[0029] Example 1:

[0030] This invention provides a glass fiber reinforced liquid-cured soil water-stopping support pile, wherein the glass fiber reinforcement 2 adopts a factory-prefabricated glass fiber steel cage.

[0031] Construction preparation stage

[0032] Preparatory work before construction is fundamental to ensuring the smooth progress of the project. First, detailed surveying and layout are carried out according to the foundation pit support design drawings. Using high-precision instruments such as a total station, the core position of each support pile is accurately marked and clearly identified with wooden stakes or lime lines. Simultaneously, the construction site is leveled and compacted, and underground obstacles are removed to ensure a stable and unobstructed working surface for the pile driver.

[0033] Regarding material preparation, the core materials required for this embodiment include:

[0034] Liquid solidified soil material: Its main components are excavated soil, solidifying agent (such as cement-based composite solidifying agent), and water. Before construction, soil samples need to be tested to determine their physicochemical properties in order to accurately control the mixing ratio of solidifying agent with soil and water, ensuring that the slurry formed after mixing has suitable fluidity and workability, and ultimately meets the design requirements for strength (usually referring to an unconfined compressive strength of not less than 0.5 MPa after 28 days) and impermeability.

[0035] Fiberglass reinforced concrete (GFRP) cages are prefabricated in a specialized factory according to the pile diameter, length, and reinforcement requirements specified in the design drawings. GFRP bars, with their high tensile strength, light weight (approximately 1 / 4 the weight of equivalent steel reinforcement), corrosion resistance, and ease of cutting and dismantling, are perfectly suited for temporary water-stopping support structures. The diameter and length of the cage must strictly conform to the design requirements. The stirrups and main reinforcement bars are reliably secured using specialized plastic binding straps or fasteners to ensure no permanent deformation occurs during transportation and hoisting. Finished cages should be neatly stacked and protected against rain and dirt.

[0036] The main construction machinery includes:

[0037] A three-axis mixing pile machine: As a pile-forming device, its power head has high torque and good stability, which can effectively ensure the quality and efficiency of pile formation in complex strata. Before the pile machine is in place, it is necessary to check whether its power system, mixing system, lifting system and high-pressure jetting system are working properly.

[0038] A truck crane with a suitable rated lifting capacity: used for lifting and lowering fiberglass reinforced steel cages. The crane must be in good working condition.

[0039] Supporting equipment includes a mortar mixing plant, mortar storage tank, delivery pump, and a theodolite or a verticality control system built into the pile driver for controlling the pile position and the verticality of the pile frame.

[0040] Construction steps:

[0041] S1: Drilling Rig Positioning and Hole Formation: First, move the triaxial mixing pile rig to the designated pile position and level the rig body using hydraulic outriggers. Then, the operator uses the rig's own verticality display system or a theodolite to precisely adjust the verticality of the pile frame guide, ensuring a deviation of less than 1 / 150. The drill rod tip is aligned with the center of the pile position, with a center deviation not exceeding 50 mm. After confirmation, start the pile rig motor, causing the three drill rods and drill bit to simultaneously rotate and descend along the guide frame, cutting the soil. During the rig's descent, monitor changes in ground resistance by controlling the motor current or descent speed until the drill bit reaches the designed pile bottom elevation, completing the hole formation operation.

[0042] S2: Preparation and Injection of Liquid Solidified Soil to Form the Pile: After the drill bit sinks to the designed depth, the high-pressure injection system is activated. At this time, the liquid solidified soil slurry, which has been mixed evenly according to the predetermined ratio at the ground slurry station, is pumped to the top of the drill rod through the delivery pipeline by a high-pressure pump and injected from the high-pressure nozzle at the bottom of the drill bit. Simultaneously, the lifting device of the pile driver is activated, and the drill rod is lifted in the opposite direction at a uniform and slow speed (usually controlled at 0.5-1.0 m / min). During this process, the high-pressure injected slurry and the soil loosened by the drill bit blades are fully and forcibly mixed to form a uniform mixed pile body that gradually transforms from liquid to solid. By strictly controlling the matching of the lifting speed and the injection pressure, the pile body is ensured to be continuous, uniform, and without breaks, ultimately forming a complete liquid solidified soil pile 1 in the stratum.

[0043] S3: Inserting the Fiberglass Reinforcing Cage: After step S2, the liquid-stabilized soil pile has been initially formed, but it is still in a plastic state with sufficient fluidity. At this point, the prefabricated fiberglass reinforcing cage should be immediately transported to the pile location. A truck crane should be positioned, and using the main hook and necessary balancing devices (such as a double-point lifting device), the cage should be carefully hooked onto its dedicated lifting point and slowly lifted vertically. Under the direction of a designated person, the crane should accurately move the cage directly above the formed liquid-stabilized soil pile, and then, relying on its own weight, slowly and vertically insert it into the center of the pile. During this process, it is strictly forbidden to use impact, pressure, or other forced methods for lowering, as this may damage the cage structure and the pile shape. Because the liquid-stabilized soil material is still in a fluid plastic state, the lightweight fiberglass reinforcing cage can smoothly sink to the design elevation. Operators should use positioning devices to ensure the cage is centered within the pile and that the protective layer thickness meets design requirements. The insertion process should be continuous until the top of the cage reaches the design elevation.

[0044] Pile Construction and Curing: After the construction of a single support pile is completed, the piling machine is moved to the next pile location, and steps S1 to S3 above are repeated for continuous construction. After all support piles are completed, the piled area must be protected, and heavy equipment should be prohibited from compacting it, allowing the liquid-solidified soil piles to cure under natural conditions. Due to its relatively long strength development period, sufficient curing time (usually 28 days) is required before excavation of the foundation pit. During this period, the liquid-solidified soil slurry gradually hardens and tightly bonds with the internal fiberglass reinforced cage, forming a composite support pile with high bending and shear strength and excellent water-stopping performance.

[0045] Final Structure and Effects: Adjacent retaining piles are interlocked using a triaxial mixing pile driving technique, forming a continuous, closed, and seamless glass fiber reinforced liquid-solidified soil cutoff wall around the foundation pit. This wall effectively isolates groundwater from seeping into the pit, ensuring a dry construction environment. Simultaneously, the built-in glass fiber reinforced steel cage significantly enhances the structural integrity of the piles, effectively resisting lateral earth pressure and ensuring the stability of the pit slope. Once the foundation pit construction is complete and backfilling is required, this support structure can be quickly dismantled due to its ease of mechanical breaking and excavation; some materials can also be recycled, demonstrating good economic and environmental benefits.

[0046] Example 2:

[0047] This embodiment is basically the same as the previous embodiment, except that the glass fiber reinforcement 2 is a factory-prefabricated glass fiber corrugated plate. Except for the type, preparation and insertion method of the reinforcement, the rest of the construction preparation, surveying and setting out, site leveling, liquid solidification soil material ratio control, construction machinery selection (such as using a three-axis mixing pile machine), pile driver positioning and leveling, verticality control, hole forming process, and liquid solidification soil slurry injection and mixing pile forming process are all the same as in Embodiment 1.

[0048] Construction preparation stage:

[0049] Material Preparation: Fiberglass Corrugated Sheets: Prefabricated in a specialized factory according to the designed pile diameter, length, and reinforcement requirements. These corrugated sheets use high-performance fiberglass as reinforcement and thermosetting resin as the matrix, manufactured through molding or pultrusion processes. Their surface exhibits a regular wavy or similar structure, a design that significantly increases the contact area and mechanical interlocking force with the liquid-solidified soil, thereby substantially improving the integrity and shear strength of the composite pile. Fiberglass corrugated sheets possess extremely high tensile strength, excellent corrosion resistance, extremely light weight (facilitating manual and mechanical handling), and the ability to be quickly mechanically broken down in the future. The width, length, and crest and trough dimensions of the sheets must strictly conform to design requirements to ensure smooth insertion into the pile and effective lateral restraint. Finished corrugated sheets should be stacked flat to prevent warping and deformation, and properly protected.

[0050] Construction steps:

[0051] S1: Drilling rig positioning and hole formation (the specific operation method and control standards for this step are exactly the same as in Example 1).

[0052] S2: Prepare and inject liquid solidified soil to form a pile (the specific operation method and control standards for this step, including lifting speed, mixing method, etc., are exactly the same as in Example 1).

[0053] S3: Insertion of the Fiberglass Corrugated Plate: After step S2, the liquid-solidified soil pile body has been initially formed and is in a plastic state. At this time, the prefabricated fiberglass corrugated plate is transported to the pile location. Since the corrugated plate is a plate-like structure, its insertion method differs from that of the reinforcing cage. One of the following two methods can be used for insertion:

[0054] Method 1 (Crane Lifting and Insertion): For larger or longer corrugated sheets, a truck crane is used. A specialized lifting device (such as a lifting beam with flexible slings) is reliably connected to the pre-designed lifting holes on the upper part of the corrugated sheet, and it is slowly lifted vertically. Under the guidance of a supervisor, the corrugated sheet is accurately moved directly above the formed pile body, and its orientation is adjusted so that the direction of the sheet surface is aligned with the predetermined direction of the retaining wall (usually parallel). Then, relying on the weight of the corrugated sheet itself, it is smoothly and vertically inserted into the center of the liquid-solidified soil pile body or the designated position. During this process, auxiliary personnel should be present to support it and prevent it from rotating or swaying due to wind loads or impacts, ensuring accurate orientation and vertical lowering.

[0055] Method 2 (Manual Insertion): For corrugated plates with smaller size and weight, manual assistance can be used in conjunction with simple slide rails or guide frames for insertion. Construction workers use leverage principles or small lifting devices to erect the corrugated plate and align it with the pile position, and then press it into the fluidized pile body along the guide device using its own weight.

[0056] Regardless of the method used, the insertion process must ensure that the corrugated plate is ultimately positioned at the required elevation and orientation. Due to its large surface area, the corrugated plate exhibits excellent bonding and interlocking properties with the liquid-solidified soil, rapidly providing significant reinforcement to the pile, particularly in terms of bending and shear strength.

[0057] Pile formation and maintenance (the protection requirements, maintenance methods and strength growth patterns at this stage are the same as in Example 1).

[0058] Final Structure and Effect: Adjacent retaining piles overlap to form a continuous water-stop curtain wall. Compared with Example 1 using a steel cage, the composite pile body formed in this example has unique characteristics: the built-in continuous glass fiber corrugated plate acts like a tough "skeleton" within the pile body. It not only provides excellent tensile strength to resist lateral earth pressure, but its large corrugated surface also forms a highly effective synergistic working mechanism with the solidified soil, greatly improving the pile's deformation performance and overall stability. This water-stop curtain reinforced by the corrugated plate effectively stops water and ensures the safety of the foundation pit. When future removal is required, the glass fiber corrugated plate is also easy to cut and process, demonstrating good workability and environmental friendliness.

[0059] Comparative example:

[0060] The pile type commonly used for foundation pit water-stopping support in existing technology is the traditional reinforced concrete mixing pile, whose structure and construction method are as follows:

[0061] Pile structure: The pile body is formed by cement-soil mixing piles, and ordinary steel cages are inserted inside as reinforcements.

[0062] Construction method:

[0063] The process involves using a mixing pile machine to form a hole; injecting cement slurry to mix with the soil to form a pile; inserting a regular steel reinforcement cage before the cement and soil initially set; hoisting with a crane, and using vibration equipment to assist in lowering if necessary; and curing to form a support pile with certain strength and water-stopping properties.

[0064] Existing problems:

[0065] The steel reinforcement cage is heavy, difficult to hoist, and prone to deformation;

[0066] Reinforcing steel is prone to corrosion, which affects its long-term durability;

[0067] Demolition is difficult, requires a large amount of mechanical crushing, and is noisy, inefficient, and costly.

[0068] It has poor environmental performance and the steel bars are difficult to recycle.

[0069] Comparison table between existing technology and Embodiment 1:

[0070]

[0071] Comparison table of prior art and embodiment two:

[0072]

[0073] In summary, the glass fiber reinforced liquid-solidified soil water-stopping support pile and its construction method provided by this invention, by using glass fiber reinforced components (steel cage or corrugated plate), are significantly superior to the existing reinforced concrete mixing pile in terms of lightweight, corrosion resistance, ease of construction, removability and environmental protection. It is particularly suitable for foundation pit projects that are sensitive to corrosion, have short construction cycles and high environmental protection requirements.

[0074] The foregoing has only described certain exemplary embodiments of the present invention by way of illustration. Undoubtedly, those skilled in the art can modify the described embodiments in various ways without departing from the spirit and scope of the present invention. Therefore, the foregoing drawings and descriptions are illustrative in nature and should not be construed as limiting the scope of protection of the claims of the present invention.

Claims

1. A glass fiber reinforced liquid-solidified soil water-stopping support pile, comprising a liquid-solidified soil pile (1), characterized in that, The inner wall of the liquid solidified soil pile (1) is equipped with a glass fiber reinforced member (2), which is one of glass fiber steel cage and glass fiber corrugated plate.

2. A construction method for glass fiber reinforced liquid-solidified soil water-stopping support piles, characterized in that, Includes the following steps: S1: Use a mixing pile drilling rig to form holes at the predetermined pile location; S2: Liquid solidified soil material is injected into the pile hole through the high-pressure jetting system of the mixing pile drilling rig, and the liquid solidified soil pile body is formed by the mixing action of the drill bit. S3: Insert glass fiber reinforcement (2) into the liquid-solidified soil pile.

3. The construction method of the glass fiber reinforced liquid-solidified soil water-stopping support pile according to claim 2, characterized in that, In step S3, after the liquid solidified soil pile (1) is initially formed, the glass fiber reinforcement (2) is inserted into it.

4. The construction method of the glass fiber reinforced liquid-solidified soil water-stopping support pile according to claim 2, characterized in that, In step S3, the glass fiber reinforced member (2) is hoisted using a lifting device and lowered to a predetermined position by its own weight.

5. The construction method of the glass fiber reinforced liquid-solidified soil water-stopping support pile according to claim 2, characterized in that, In step S1, the mixing pile drilling rig is one of a single-axis mixing pile machine and a three-axis mixing pile machine.

6. The construction method of the glass fiber reinforced liquid-solidified soil water-stopping support pile according to claim 2, characterized in that, The glass fiber reinforcement (2) is one of glass fiber steel cage and glass fiber corrugated plate prefabricated in the factory.

7. The construction method of the glass fiber reinforced liquid-solidified soil water-stopping support pile according to claim 2, characterized in that, The construction method described herein is used to construct a water-stop curtain for foundation pit engineering.

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