In-situ rapid bearing and waterproof integrated structure for soft soil site

Abstract

The utility model relates to a kind of soft soil site in situ quick bearing waterproof integrated structure, including low-strength bottom base, low-strength bottom base bottom lays fiber grid and inserts bamboo reinforcement, high-strength base is equipped in low-strength bottom base upper end, waterproof assembly is equipped in high-strength base upper end, gravel skid-resistant layer is equipped in waterproof assembly upper end, quick hard surface layer is equipped in gravel skid-resistant layer upper end, drainage assembly is equipped in quick hard surface layer upper end.The soft soil site in situ quick bearing waterproof integrated structure can be opened for use after 48h of construction completion, greatly shortens construction period, the integrated structure keeps rate after immersion≥99%, surface layer is without cracking and secondary argillization phenomenon, soft soil of site is fully utilized, avoids replacement construction, reduces the cost of cleaning and transportation, reduces engineering cost, composite waterproof layer prevents water from entering structure inside;And slope drainage channel quickly discharges possibly existing small amount of seepage or surface water, cooperatively constructs a complete water management system.

Description

Technical Field

[0001] This utility model relates to the field of geotechnical engineering foundation treatment technology, specifically to an in-situ rapid bearing and waterproof integrated structure for soft soil sites. Background Technology

[0002] In-situ rapid bearing capacity waterproofing for soft soil sites is a comprehensive construction solution that combines soft soil solidification technology with waterproofing measures. It aims to improve the bearing capacity and waterproofing performance of soft soil foundations through physical and chemical reactions. A smart mixing system mixes solidifying agents (cement, lime, etc.) with soft soil, and the mixing head penetrates deep into the ground for forced mixing, fixing the moisture in the soil in the form of crystal water, reducing the water content and enhancing the bonding strength. After solidification, the soil can quickly form a stable base layer. Through the synergistic effect of solidification and waterproofing, it solves the problems of insufficient bearing capacity and water seepage in soft soil foundations, becoming an efficient and economical solution in modern engineering.

[0003] However, in practical applications, traditional soft soil solidification usually uses lime or cement mixing methods, which have a long solidification cycle and are prone to secondary mudification and slurry heaving when exposed to water. In addition, a single structural layer is difficult to meet the requirements of immediate load-bearing and long-term waterproofing. Therefore, in order to meet the engineering requirements of timely access for equipment and personnel in deep muddy sites with high water content, it is necessary to develop a load-bearing and waterproof integrated structure that can form a walking surface within 48 hours. Based on this, an in-situ rapid load-bearing and waterproof integrated structure for soft soil sites is proposed to solve the above problems. Utility Model Content

[0004] To address the shortcomings of existing technologies, this utility model provides an in-situ rapid load-bearing and waterproof integrated structure for soft soil sites. It has the advantages of rapid load-bearing and waterproof integrated structure and high load-bearing capacity retention rate after immersion in water. It solves the pain points of traditional soft soil solidification cycle, secondary mudification, load-bearing delay, and weak waterproofing in conventional treatment of soft soil sites with high water content.

[0005] To achieve the above objectives, this utility model provides the following technical solution: an in-situ rapid bearing and waterproof integrated structure for soft soil sites, comprising a low-strength subbase, a fiber mesh grid laid at the bottom of the low-strength subbase and bamboo reinforcement inserted therein, a high-strength subbase provided at the top of the low-strength subbase, a waterproof component provided at the top of the high-strength subbase, a gravel anti-slip layer provided at the top of the waterproof component, a quick-hardening surface layer provided at the top of the gravel anti-slip layer, and a drainage component provided at the top of the quick-hardening surface layer.

[0006] Furthermore, the waterproofing components include a composite waterproofing layer disposed between the high-strength base layer and the gravel anti-slip layer, and an edge-sealing waterproofing strip fixedly connected to the side of the composite waterproofing layer.

[0007] Furthermore, the drainage assembly includes a sloping drainage channel disposed on the upper end of the quick-hardening surface layer and a drainage pipe channel connected to the low point of the sloping drainage channel.

[0008] Furthermore, the low-strength subbase includes a low-strength, fast-hardening, fluidized solidified soil subbase, which is prepared by on-site mixing of soft soil, solidifying agent, and water.

[0009] Furthermore, a fiber mesh grid is laid at the bottom of the low-strength, fast-hardening fluidized solidified soil subbase, and bamboo reinforcement is inserted at the bottom of the low-strength, fast-hardening fluidized solidified soil subbase.

[0010] Furthermore, the upper side of the bamboo reinforcement surface is buried in the low-strength, fast-hardening, fluidized solidified soil subbase, while the lower side of the bamboo reinforcement surface is inserted into the original soft soil layer at the bottom of the low-strength, fast-hardening, fluidized solidified soil subbase.

[0011] Furthermore, the high-strength base layer includes a high-strength, fast-hardening fluidized solidified soil base layer, which is prepared by on-site mixing of soft soil, solidifying agent, and water. The fast-hardening surface layer includes a fast-hardening, ultra-early-strength, non-shrinkage fiber mortar surface layer.

[0012] Compared with the prior art, the technical solution of this application has the following beneficial effects:

[0013] This in-situ rapid-bearing waterproof integrated structure for soft soil sites can be opened for use 48 hours after construction, significantly shortening the construction period. The integrated structure retains ≥99% of its bearing capacity after immersion in water, with no cracking or secondary mudification on the surface. It makes full use of the soft soil on-site, avoiding replacement construction, reducing cleanup costs, and lowering project costs. The composite waterproof layer prevents water from entering the structure's interior, while the sloping drainage channel quickly drains any possible small amounts of seepage or surface water. Together, they form a complete water management system, significantly improving the structure's adaptability and safety in rainy or high-water-level environments. This ensures that the core bearing layer will not experience strength reduction or secondary mudification due to water intrusion, thus guaranteeing the long-term bearing capacity and stability of the entire foundation. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the structure of the present utility model. Figure 1 ;

[0015] Figure 2 This is a schematic diagram of the quick-setting surface layer and drainage component of this utility model;

[0016] Figure 3 This is a schematic diagram of the waterproof component structure of this utility model;

[0017] Figure 4 This is a schematic diagram of the structure of the present utility model. Figure 2 ;

[0018] Figure 5 This is a schematic diagram of the fiber mesh grid structure of this utility model.

[0019] In the diagram: 1. Hard, ultra-early strength, non-shrink fiber mortar surface layer; 2. Crushed stone anti-slip layer; 3. High-strength, fast-hardening, fluidized solidified soil base layer; 4. Low-strength, fast-hardening, fluidized solidified soil subbase layer; 5. Fiber mesh grid; 6. Bamboo reinforcement; 7. Composite waterproof layer; 8. Edge sealing waterproof strip; 9. Sloping drainage channel; 10. Drainage pipe channel. Detailed Implementation

[0020] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0021] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described below in conjunction with the accompanying drawings and embodiments.

[0022] In the field of geotechnical engineering, the treatment of soft soil foundations has always been a key and challenging issue in engineering construction. Soft soil typically refers to cohesive soils with high natural water content, large void ratio, high compressibility, low shear strength, and poor permeability, and is widely distributed in coastal areas, riverbanks, lakes, and swamps. In my country, soft soil areas are mainly concentrated in economically developed regions such as the southeast coast, the middle and lower reaches of the Yangtze River, and the Pearl River Delta. These areas are precisely where infrastructure construction is intensive and urbanization is rapidly advancing. Therefore, how to efficiently, economically, and safely treat soft soil foundations is directly related to the progress, cost, and safety of engineering construction.

[0023] Traditional methods for treating soft soil foundations mainly include preloading (such as surcharge preloading and vacuum preloading), dynamic compaction, deep mixing (such as cement mixing piles and lime mixing piles), replacement, and pile foundations. Among these, cement or lime mixing and solidification is widely used due to its simple construction and moderate cost. This method involves incorporating cement or lime, or other cementing materials, into the soft soil, utilizing their hydration reaction with the moisture in the soil to form a solidified body with a certain strength, thereby improving the bearing capacity of the foundation. However, this method has many limitations in practical applications. First, the solidification reaction requires a certain time period, typically 7 days or even longer, to reach the design strength, which cannot meet the needs of emergency projects requiring rapid formation of a bearing surface. Second, cement or lime-solidified soil exhibits slow early strength development, especially under high moisture content conditions. Excessive moisture dilutes the cementing materials, affecting the efficiency of the hydration reaction and further slowing down strength growth. Even more seriously, once the solidified soil comes into contact with a large amount of water again, especially when soaked by rainwater, groundwater or construction water, it is prone to secondary mudification or frost heave, resulting in a sharp drop in strength and seriously affecting the stability and durability of the foundation.

[0024] Furthermore, traditional foundation treatment methods often separate load-bearing and waterproofing functions. For example, after cement mixing pile construction, multiple layers of structures such as sand and gravel cushions, geotextiles, and waterproof membranes are usually laid to achieve drainage and seepage prevention. This layered design not only increases construction procedures and material costs, but also makes the interfaces between layers prone to becoming weak points, resulting in poor overall integrity and uneven settlement or leakage. Especially in deep soft soil sites with high water content (such as muddy ground with water content exceeding the liquid limit and a depth exceeding 0.5 meters), conventional methods are unable to form a stable, continuous working surface with sufficient load-bearing capacity in a short time, severely restricting the timely entry of equipment and personnel, and thus affecting the overall project schedule.

[0025] In recent years, with the acceleration of urbanization and the frequent occurrence of extreme weather events, higher demands have been placed on soft soil foundation treatment. On the one hand, many emergency projects (such as disaster relief access roads, temporary construction platforms, and military facility deployments) require foundation treatment to be completed and put into use within a very short time (e.g., within 48 hours); on the other hand, the concepts of environmental protection and sustainable development have also prompted the engineering community to seek greener and more efficient foundation treatment technologies. Traditional materials such as cement and lime have high energy consumption and large carbon emissions during production, and their large-scale use may impact the surrounding ecological environment. Therefore, developing a foundation treatment structure that can achieve "on-site, rapid, load-bearing, and waterproof" integration has become an urgent need in the field of geotechnical engineering.

[0026] Against this backdrop, this utility model proposes an integrated structure for in-situ rapid load-bearing and waterproofing in soft soil sites, aiming to overcome the shortcomings of existing technologies. The core idea of ​​this structure is "in-situ utilization, rapid response, and functional integration." "In-situ utilization" refers to making full use of on-site soft soil resources, avoiding large-scale excavation and off-site soil transportation, and reducing environmental disturbance; "rapid response" emphasizes optimizing material ratios and construction processes to enable the foundation to form a stable structure that meets load-bearing requirements in a very short time (e.g., within 48 hours); "functional integration" integrates multiple functions such as load-bearing, waterproofing, and erosion resistance into the same structural system, avoiding interface problems and construction complexity caused by traditional layered structures.

[0027] Specifically, this integrated structure may utilize novel fast-setting materials (such as special cement, alkali-activated materials, and polymers) mixed in situ with soft soil to form a composite soil body with high early strength and good water resistance. Simultaneously, the overall waterproofing performance of the structure is enhanced by adding hydrophobic additives or installing an internal waterproof layer (such as bentonite waterproof blankets or polymer waterproof membranes). The structural design can employ layered composite or gradient functional designs, with the surface layer focusing on wear resistance, compressive strength, and slip resistance; the middle layer providing the main load-bearing capacity; and the bottom layer taking into account drainage and seepage prevention. Furthermore, technologies such as geogrids and fiber reinforcement can be combined to further improve the structure's integrity and deformation resistance.

[0028] Compared with traditional methods, this integrated structure has significant advantages: First, it is fast to construct and can form a stable load-bearing surface in a short time to meet the needs of emergency projects; second, it has high material utilization, reducing the cost of purchasing external materials and transportation; third, it has good structural integrity, with waterproofing and load-bearing functions working together to avoid the interface hazards of traditional layered structures; and fourth, it is environmentally friendly, reducing the use of high-carbon materials such as cement, which is in line with the development direction of green building.

[0029] In conclusion, developing an in-situ, rapidly load-bearing, waterproof integrated structure to address the engineering challenges of soft soil sites with high moisture content is not only a technological innovation but also an inevitable choice to meet the needs of real-world engineering projects. This technology is expected to be widely applied in emergency engineering, temporary facilities, and ecological restoration, driving geotechnical engineering towards a more efficient, intelligent, and sustainable direction.

[0030] Please see Figures 1-5 The in-situ rapid bearing and waterproof integrated structure for soft soil sites in this embodiment includes a low-strength subbase, a fiber mesh grid 5 laid at the bottom of the low-strength subbase and bamboo reinforcement 6 inserted therein, a high-strength subbase at the top of the low-strength subbase, a waterproof component at the top of the high-strength subbase, a gravel anti-slip layer 2 at the top of the waterproof component, a quick-hardening surface layer at the top of the gravel anti-slip layer 2, and a drainage component at the top of the quick-hardening surface layer.

[0031] In this embodiment, the subbase, composed of low-strength, fast-setting fluidized solidified soil, has a thickness of 50–60 cm. This low-strength, fast-setting fluidized solidified soil is prepared on-site by mixing soft soil with a solidifying agent and water. Its flowability is 220 ± 20 mm, final setting time ≤ 2 h, 24 h unconfined compressive strength ≥ 0.8 MPa, 7 d unconfined compressive strength ≥ 1.2 MPa, and 7 d permeability coefficient ≤ 5 × 10⁻⁶. -8The subbase consists of a fiber mesh grid laid at the bottom with a mesh spacing of 25cm. Bamboo reinforcing bars, 80-100cm long and 4-5cm in diameter, are inserted at 50cm intervals at the bottom of the subbase. One-third of the bamboo reinforcing bar length is buried within the low-strength, fast-setting fluidized solidified soil subbase, while two-thirds are inserted into the existing soft soil layer at the bottom of the subbase. The subbase, composed of high-strength, fast-setting fluidized solidified soil, has a thickness of 20-25cm. This high-strength, fast-setting fluidized solidified soil is prepared by on-site mixing of soft soil, solidifying agent, and water. Its flowability is 220±20mm, final setting time ≤2h, 24h unconfined compressive strength ≥1.5MPa, 7d unconfined compressive strength ≥2MPa, and 7d permeability coefficient ≤5×10⁻⁶. -8 cm / s, crushed stone anti-slip layer, with a thickness of 2-3cm and crushed stone particle size of 10-20mm, and the surface layer composed of fast-hardening ultra-early strength non-shrinkage fiber mortar, with a thickness of 5-6cm, the fast-hardening ultra-early strength non-shrinkage fiber mortar has a flowability of 300±20mm, initial setting time ≤45min, final setting time ≤60min, 2h compressive strength ≥25MPa, 12h flexural strength ≥8MPa, 3d flexural strength ≥12MPa, and 7d impermeability grade ≥P10.

[0032] Please see Figures 1-5 In this embodiment, the waterproofing component includes a composite waterproofing layer 7 disposed between the high-strength base layer and the gravel anti-slip layer 2, and an edge sealing waterproofing strip 8 fixedly connected to the side of the composite waterproofing layer 7. The drainage component includes a sloping drainage channel 9 disposed at the upper end of the quick-hardening surface layer and a drainage pipe channel 10 connected to the low point of the sloping drainage channel 9.

[0033] It should be noted that the composite waterproof layer 7 can be composed of a "high-density polyethylene geomembrane" and a "sodium-based bentonite waterproof blanket", or it can be composed of "two layers of geotextile sandwiching a layer of geomembrane". This composite structure combines the low permeability of geomembrane with the self-healing properties of bentonite when it comes into contact with water, resulting in better waterproofing. The edge sealing waterproof strip 8 can be composed of a sealing strip compatible with the composite waterproof layer material or a waterproof material of the same material that is welded / bonded, ensuring the water tightness of the joint.

[0034] Please see Figures 1-5In this embodiment, the low-strength subbase includes a low-strength, fast-hardening fluidized solidified soil subbase 4, which is prepared by on-site mixing of soft soil, curing agent, and water. A fiber mesh grid 5 is laid at the bottom of the low-strength, fast-hardening fluidized solidified soil subbase 4, and bamboo reinforcement 6 is inserted at the bottom of the low-strength, fast-hardening fluidized solidified soil subbase 4. The upper side of the surface of the bamboo reinforcement 6 is buried in the low-strength, fast-hardening fluidized solidified soil subbase 4, and the lower side of the surface of the bamboo reinforcement 6 is inserted into the original soft soil layer at the bottom of the low-strength, fast-hardening fluidized solidified soil subbase 4. The high-strength subbase includes a high-strength, fast-hardening fluidized solidified soil subbase 3, which is prepared by on-site mixing of soft soil, curing agent, and water. The fast-hardening surface layer includes a fast-hardening, ultra-early-strength, non-shrinkage fiber mortar surface layer 1.

[0035] It should be noted that the main function of the fiber mesh grid 5 is reinforcement and stress diffusion. It can improve the integrity of the low-strength subbase, prevent cracks caused by uneven settlement or stress concentration, and transfer the upper load more evenly to the lower soft soil layer. The mesh grid should be laid on the upper or middle part of the bamboo reinforcement 6. The bamboo reinforcement 6 passes through the mesh grid nodes to form a better spatial reinforcement effect. The bamboo reinforcement 6 has undergone anti-corrosion treatment before use. The main raw materials of the low-strength subbase and high-strength base are soft soil excavated on site, which is prepared by adding a small amount of curing agent (such as cement, fly ash, alkali activator, etc.) and water and mixing in situ.

[0036] The working principle of the above embodiments is as follows:

[0037] During use, a low-strength, fast-setting fluidized solidified soil subbase 4, prepared on-site from soft soil, is 60cm thick. A fiber mesh grid 5 with a 25cm grid spacing is laid horizontally 10cm from the bottom surface of the subbase. Bamboo reinforcing bars 6, 90cm long and 5cm in diameter, are inserted at 50cm intervals. 30cm long bamboo reinforcing bars 6 are embedded within the subbase, and the remaining 60cm long bars are inserted into the existing soft soil layer at the bottom of the subbase. Before final setting, a high-strength, fast-setting fluidized solidified soil base 3, also prepared on-site from soft soil, is poured on top of the low-strength, fast-setting fluidized solidified soil subbase 4, with a thickness of 25cm. After final setting, the high-strength, fast-setting fluidized solidified soil base 3... Within 2 hours, a waterproof component was installed on top, and a 20mm crushed stone anti-slip layer 2 was spread on the waterproof component. The crushed stone layer was then gently patted down to 1 / 2 of its thickness and pressed into the high-strength, fast-hardening, fluidized solidified soil base layer 3. Six hours after the crushed stone anti-slip layer 2 was laid, a fast-hardening, ultra-early-strength, non-shrinkage fiber mortar surface layer 1 with a thickness of 5cm was poured. The surface was manually smoothed, and a sloping drainage channel 9 was opened on the surface. Drainage pipe channels 10 were set on the sides to connect with the municipal pipe network. After final setting, the surface was covered with geotextile for curing. Water was sprayed every 4 hours. After 12 hours of curing, the geotextile was removed and the site was opened for use. After a vehicle load test (axle load 10t), there were no cracks or settlement on the structural surface, and the site was soaked in water for 1 day without mudification or frost heaving.

[0038] It should be noted that the control method of this utility model is controlled by a controller. The control circuit of the controller can be implemented by those skilled in the art through simple programming. The power supply is also common knowledge in the art. Therefore, this utility model will not explain the control method and circuit connection in detail.

[0039] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0040] Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the present invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. An in-situ rapid load-bearing and waterproof integrated structure for soft soil sites, comprising a low-strength subbase, characterized in that: A fiber mesh grid (5) is laid at the bottom of the low-strength base layer and bamboo reinforcement (6) is inserted. A high-strength base layer is provided at the top of the low-strength base layer. A waterproof component is provided at the top of the high-strength base layer. A gravel anti-slip layer (2) is provided at the top of the waterproof component. A quick-hardening surface layer is provided at the top of the gravel anti-slip layer (2). A drainage component is provided at the top of the quick-hardening surface layer.

2. The in-situ rapid bearing and waterproof integrated structure for soft soil sites according to claim 1, characterized in that: The waterproofing components include a composite waterproofing layer (7) disposed between the high-strength base layer and the gravel anti-slip layer (2) and an edge sealing waterproofing strip (8) fixedly connected to the side of the composite waterproofing layer (7).

3. The in-situ rapid bearing and waterproof integrated structure for soft soil sites according to claim 1, characterized in that: The drainage assembly includes a sloping drainage channel (9) located at the upper end of the quick-hardening surface layer and a drainage pipe channel (10) connected to the low point of the sloping drainage channel (9).

4. The in-situ rapid bearing and waterproof integrated structure for soft soil sites according to claim 1, characterized in that: The low-strength subbase includes a low-strength, fast-hardening, fluidized solidified soil subbase (4), which is prepared by mixing soft soil, solidifying agent and water on-site.

5. The in-situ rapid bearing and waterproof integrated structure for soft soil sites according to claim 4, characterized in that: The fiber mesh grid (5) is laid at the bottom of the low-strength, fast-hardening fluidized solidified soil subbase (4), and the bamboo reinforcement (6) is inserted at the bottom of the low-strength, fast-hardening fluidized solidified soil subbase (4).

6. The in-situ rapid bearing and waterproof integrated structure for soft soil sites according to claim 5, characterized in that: The upper side of the bamboo reinforcement (6) is buried in the low-strength, fast-hardening, fluidized solidified soil subbase (4), and the lower side of the bamboo reinforcement (6) is inserted into the original soft soil layer at the bottom of the low-strength, fast-hardening, fluidized solidified soil subbase (4).

7. The in-situ rapid bearing and waterproof integrated structure for soft soil sites according to claim 1, characterized in that: The high-strength base layer includes a high-strength, fast-hardening fluidized solidified soil base layer (3), which is prepared by mixing soft soil, solidifying agent and water on-site. The fast-hardening surface layer includes a fast-hardening, ultra-early strength, non-shrinkage fiber mortar surface layer (1).

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