Cement soil pile wall and plastic steel sheet pile composite vertical seepage interception system and construction method thereof

Abstract

The invention belongs to the field of engineering foundation seepage prevention, and discloses a cement soil pile wall and plastic steel sheet pile composite vertical seepage interception system and a construction method thereof.The composite vertical seepage interception system comprises a cement soil pile wall formed through stirring in advance, a plastic steel sheet pile formed through macromolecule thermoplastic forming and a connecting structure for connecting the plastic steel sheet pile and a main body; the connecting structure is composed of a rubber water stop strip, a seepage-stopping post-pouring connector, a water stop copper sheet and a flexible water stop material layer, the bottom of the plastic steel plate pile is flush with the bottom face of the cement soil pile wall, and the top of the plastic steel plate pile is exposed out of the top face of the cement soil pile wall. During construction, a special device is selected to pre-form a cement soil pile wall according to the type of a foundation soil layer, a plastic steel sheet pile is implanted before the cement soil pile wall is condensed, and after top surface cleaning and flattening, rubber water stop strip fixing, joint pouring after seepage interception and flexible water stop material layer brushing are conducted, a concrete tooth ridge and a wading building bottom plate are synchronously poured to form a seepage interception closed system. Double seepage interception is formed through the cement soil and the plastic steel sheet pile, and the water stopping reliability and the soil layer adaptability are improved.

Description

Technical Field

[0001] This invention belongs to the field of foundation seepage prevention in water-related engineering, and specifically relates to a composite vertical seepage interception system of cement-soil pile wall and plastic steel sheet pile and its construction method, aiming to solve the foundation seepage prevention problem of water-related buildings. Background Technology

[0002] For structures involving water, the flow of water beneath the foundation leads to the loss of soil particles, causing voids in the substructure and creating seepage channels. This can damage the overall structure and cause engineering failure. Water-related projects typically employ vertical seepage interception systems at the base to prevent seepage damage.

[0003] Water-related structures are prone to soil particle loss due to water flow beneath their foundations, creating seepage channels. Traditional vertical seepage interception systems have the following drawbacks: 1) Limitations of plastic steel sheet piles: low driving efficiency in hard soil and sand layers, high leakage rate at interlocking joints accounting for a high proportion of engineering accidents; difficult to connect with concrete structures, with a high leakage rate at the joints.

[0004] 2) Insufficient single water-stopping structure: Concrete cutoff walls have long construction cycles and high costs; single plastic steel sheet piles have poor water-stopping reliability under complex geological conditions. Summary of the Invention

[0005] The purpose of this invention is to overcome the shortcomings of existing technologies and provide a composite vertical seepage interception system and construction method of cement-soil pile walls and plastic steel sheet piles. It utilizes cement-soil pile wall equipment for pre-forming piles or trenches. Before the cement-soil pile wall solidifies, plastic steel sheet piles are implanted into the cement-soil pile wall using methods such as non-resonance or static pressure, reducing the impact of the construction environment and improving construction efficiency. Simultaneously, a certain range of cement-soil is wrapped within the plastic steel sheet pile structure, forming a dual and reliable water-stopping effect that is both economical and convenient to construct. This invention solves the problem of poor soil adaptability in plastic steel sheet pile construction. Furthermore, the cement-soil and plastic steel sheet piles form a dual and reliable composite vertical seepage interception system, eliminating the potential for localized leakage due to failed interlocking connections of the plastic steel sheet piles. Compared to traditional single water-stopping structures, it has better water-stopping effect, stronger soil adaptability, and more reliable structural connection effectiveness.

[0006] The present invention relates to a composite vertical seepage interception system of cement-soil pile wall and plastic steel sheet pile for foundation seepage prevention of water-related buildings. It has a dual seepage interception system and forms a reliable connection with the main structure. It also has better soil adaptability and has great potential for promotion.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A composite vertical seepage interception system of cement-soil pile wall and plastic-steel sheet pile includes plastic-steel sheet piles, a cement-soil pile wall, and a connection structure for connecting the plastic-steel sheet piles to the main body. The cement-soil pile wall is pre-mixed using specialized equipment. The plastic-steel sheet piles are thermoplastic molded from high-polymer materials. The plastic-steel sheet piles are inserted into the cement-soil pile wall by a pile-planting device, with their bottoms flush with the bottom surface of the cement-soil pile wall and their tops protruding above the top surface of the cement-soil pile wall. The connection structure for connecting the plastic-steel sheet piles to the main body includes a rubber waterstop strip, a post-interception joint, a waterstop copper sheet, and a flexible waterstop material layer. The rubber waterstop strip is installed on both sides of the exposed section of the plastic-steel sheet pile and fixed with through-steel nails. The post-interception joint wraps around the exposed section of the plastic-steel sheet pile, and the waterstop copper sheet is located at the top of the post-interception joint. The flexible waterstop material layer is brushed onto the outer surface of the post-interception joint.

[0008] Furthermore, the specialized equipment may employ axial stirring single or dual-shaft equipment, triaxial or multi-shaft equipment, or channel cutting TRD equipment, or radial cutting dual-wheel milling CSM equipment, etc.

[0009] Furthermore, the pile planting equipment adopts a resonance-free hammer or a static pressure pile planting machine, etc.

[0010] Furthermore, the length of the plastic steel sheet pile exposed above the cement-soil pile wall is not less than 50cm.

[0011] Another object of the present invention is to provide a construction method for a composite vertical seepage interception system of cement-soil pile wall and segmented plastic steel sheet pile, such as... Figure 3 As shown, it includes the following steps: S1. Pre-mixing or pre-grooving to form cement-soil pile walls; Cement-soil pile walls can be formed by pre-mixing or pre-grooving using axial mixing single- or double-shaft equipment, triaxial and multi-shaft equipment, channel cutting TRD equipment, and radial cutting double-wheel milling CSM equipment. If the foundation soil layer is soft soil, 0-5% of the mass of the mixed soil can be added as a curing agent, such as SN201-A; if the foundation soil layer is silty sand, 0-10% of the mass of the mixed soil can be added as a curing agent, such as bentonite.

[0012] S2. Insert the plastic steel sheet piles into the cement-soil pile wall; Before the cement-soil pile wall sets, plastic steel sheet piles are inserted into the cement-soil pile wall using methods such as non-resonant hammers or static pressure pile drivers. The bottom of the plastic steel sheet pile is flush with the bottom surface of the cement-soil pile wall, and the top protrudes from the top surface of the cement-soil pile wall, with an exposed section length of not less than 50cm.

[0013] S3. Level and clean the top surface of the cement-soil pile wall; Remove laitance, debris, and oil stains from the top surface of the cement-soil pile wall. After roughening, the flatness deviation should be ≤5mm. After cleaning, the top surface of the cement-soil pile wall should be moist but without standing water. If necessary, apply an interface agent or lay a bonding layer on the top surface of the cement-soil pile wall.

[0014] S4. Install rubber waterstop strips on both sides of the plastic steel sheet pile and fix them with through steel nails; For the holes of the steel nails, use vulcanized heat bonding or waterproof adhesive to bond them. After fixing, check and ensure that the rubber waterstop strip is not displaced or damaged and that the steel nails are not loose. If necessary, use waterproof sealant to seal the steel nail holes and joint gaps a second time.

[0015] S5. After casting the vertical formwork and cutting off seepage, a water-stop copper plate is pre-embedded at the top of the casting joint; The concrete properties of the joint after seepage interception should not be less than C30F50; the copper waterstop sheet should preferably be made of T2 copper (copper content ≥99.9%), with a thickness of 2mm, tensile strength ≥200MPa, and elongation ≥30%.

[0016] S6. Apply a flexible waterproofing material layer to the outside of the joint after seepage interception; The flexible waterproofing material layer is preferably made of No. 10 asphalt for construction.

[0017] S7. Simultaneously pour concrete toothed sills and the bottom slab of water-related buildings to form a seepage interception and sealing system.

[0018] The beneficial effects of this invention are: 1. Dual guarantee of water-stopping effect: The cement-soil pile wall and the plastic steel sheet pile form a composite seepage interception system. The cement soil fills the gap of the plastic steel sheet pile interlocking, which completely solves the leakage risk of single plastic steel sheet pile interlocking, and greatly improves the reliability of seepage interception.

[0019] 2. Strong adaptability to soil layers: By optimizing construction conditions through cement-soil precast piles / trenching, the limitations of low driving efficiency of plastic steel sheet piles in hard soil and sand layers are overcome, making it suitable for various complex geological conditions such as soft soil and silty sand.

[0020] 3. Highly efficient and economical construction: The use of non-resonance and static pressure pile planting methods reduces construction noise and environmental disturbance; compared with concrete cutoff walls, it can effectively shorten the construction cycle, reduce material and construction costs, and balance economy and convenience.

[0021] 4. More reliable structural connection: Through multiple connection structures such as rubber waterstop strips, waterstop copper sheets, and flexible waterstop layers, the composite seepage interception system is tightly connected to the main building, eliminating the risk of leakage at the connection and ensuring the overall stability of the project.

[0022] 5. Combining durability and environmental protection: Plastic steel sheet piles are made of high-polymer materials through thermoplastic molding, combined with cement soil for solidification and protection, resulting in excellent corrosion resistance and aging resistance; the construction process produces no waste mud pollution, meeting the requirements of green engineering and extending the service life of water-related projects. Attached Figure Description

[0023] Figure 1 This is a schematic diagram of the longitudinal section structure of the system of the present invention; Figure 2 This is a schematic diagram of the cross-sectional structure of the system of the present invention; Figure 3 This is a flowchart of the construction method of the present invention.

[0024] In the diagram: 1-Cement-soil pile wall; 2-Plastic steel sheet pile; 3-Connection structure between plastic steel sheet pile and main structure; 31-Rubber waterstop strip; 32-Pouring joint after seepage interception; 33-Waterstop copper sheet; 34-Flexible waterstop material layer; 4-Base slab of water-related building; 5-Concrete toothed sill. Detailed Implementation

[0025] To make the objectives, technical solutions, and advantages of the present invention clearer, the invention will be further described in detail below with reference to the accompanying drawings and embodiments. However, it should be noted that the specific embodiments described herein are merely illustrative and not intended to limit the scope of the invention. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of the present invention.

[0026] This invention proposes a cement-soil pile wall-plastic steel sheet pile composite vertical seepage interception system, such as... Figure 1 , Figure 2 As shown, the structure includes a cement-soil pile wall 1, plastic-steel sheet piles 2, and a connection structure 3 connecting the plastic-steel sheet piles to the main body. The cement-soil pile wall 1 is pre-mixed using specialized equipment. The plastic-steel sheet piles 2 are thermoplastic molded from high-polymer materials. The plastic-steel sheet piles 2 are inserted into the cement-soil pile wall 1 by a pile-planting device, with their bottom flush with the bottom surface of the cement-soil pile wall 1 and their top exposed above the top surface of the cement-soil pile wall 1. The connection structure 3 connecting the plastic-steel sheet piles to the main body includes a rubber waterstop strip 31, a seepage-stopping post-cast joint 32, a waterstop copper sheet 33, and a flexible waterstop material layer 34. The rubber waterstop strip 31 is set on both sides of the exposed section of the plastic-steel sheet pile 2 and fixed with through-hole steel nails. The seepage-stopping post-cast joint 32 wraps around the exposed section of the plastic-steel sheet pile 2, and the waterstop copper sheet 33 is located on top of the seepage-stopping post-cast joint 32. The flexible waterstop material layer 34 is brushed onto the outer surface of the seepage-stopping post-cast joint 32.

[0027] The construction method of the cement-soil pile wall-plastic steel sheet pile composite vertical seepage interception system of the present invention, as follows: Figure 3 As shown, it includes the following steps: S1. Pre-mixing or pre-grooving to form cement-soil pile walls 1; Cement-soil pile walls are formed by pre-mixing or pre-grooving using axial mixing single- or double-shaft equipment, triaxial and multi-shaft equipment, channel cutting TRD equipment, and radial cutting double-wheel milling CSM equipment. If the foundation soil layer is soft soil, 0-5% of the mass of the mixed soil can be added as a curing agent; SN201-A can be selected as the curing agent. If the foundation soil layer is silty sand, 0-10% of the mass of the mixed soil can be added as a curing agent; bentonite can be selected as the curing agent.

[0028] S2. Insert the plastic steel sheet pile 2 into the cement-soil pile wall 1; Before the cement-soil pile wall 1 sets, plastic steel sheet piles 2 are inserted into the cement-soil pile wall 1 using a non-resonant hammer or static pressure pile driver. The bottom of the plastic steel sheet pile 2 is flush with the bottom surface of the cement-soil pile wall 1, and the top protrudes from the top surface of the cement-soil pile wall 1, with an exposed section length of not less than 50cm.

[0029] S3. Level and clean the top surface of cement-soil pile wall 1; Remove the laitance, debris and oil stains from the top surface of cement-soil pile wall 1. After roughening, the flatness deviation should be ≤5mm. After cleaning, the top surface of cement-soil pile wall 1 should be moist but without water accumulation. If necessary, apply an interface agent or lay a bonding layer on the top surface of cement-soil pile wall 1.

[0030] S4. Install rubber waterstop strips 31 on both sides of the plastic steel sheet pile 2 and fix them with through steel nails; For the holes of the steel nails, use vulcanized heat bonding or waterproof adhesive to bond them. After fixing, check and ensure that the rubber waterstop strip 31 is not displaced or damaged and that the steel nails are not loose. If necessary, use waterproof sealant to seal the steel nail holes and joint gaps a second time.

[0031] S5. After casting the vertical formwork and cutting off the seepage, a water-stop copper plate 33 is pre-embedded at its top; The concrete properties of the post-cutoff joint 32 shall not be less than C30F50; the water-stop copper sheet 33 shall preferably be made of T2 copper (copper content ≥99.9%), with a thickness of 2mm, tensile strength ≥200MPa, and elongation ≥30%.

[0032] S6. Apply a flexible water-stopping material layer 34 to the outside of the cut-off joint 32; The flexible water-stopping material layer 34 is preferably made of No. 10 building asphalt.

[0033] S7. Simultaneously pour concrete toothed sill 5 and the bottom slab 4 of the water-related building to form a seepage interception and sealing system.

[0034] The above embodiments have been described with reference to the accompanying drawings, but they should not be construed as limiting the scope of protection of the present invention. It should be noted that for those skilled in the art, any technical solutions obtained by equivalent substitution or equivalent transformation without departing from the concept of the present invention are all within the scope of protection of the present invention.

Claims

1. A composite vertical seepage interception system of cement-soil pile wall and plastic-steel sheet pile, characterized in that: The system includes plastic-steel sheet piles, cement-soil pile walls, and a connection structure between the plastic-steel sheet piles and the main body. The cement-soil pile walls are pre-mixed using specialized equipment. The plastic-steel sheet piles are thermoplastic molded from high-polymer materials. The plastic-steel sheet piles are inserted into the cement-soil pile wall using a pile-planting device, with their bottoms flush with the bottom surface of the cement-soil pile wall and their tops protruding above the top surface of the cement-soil pile wall. The connection structure between the plastic-steel sheet piles and the main body includes rubber waterstops, a seepage-stopping post-cast joint, a waterstop copper sheet, and a flexible waterstop material layer. The rubber waterstops are installed on both sides of the exposed section of the plastic-steel sheet pile and fixed with through-steel nails. The seepage-stopping post-cast joint wraps around the exposed section of the plastic-steel sheet pile, and the waterstop copper sheet is located on top of the seepage-stopping post-cast joint. The flexible waterstop material layer is brushed onto the outer surface of the seepage-stopping post-cast joint.

2. The composite vertical seepage interception system of cement-soil pile wall and plastic-steel sheet pile according to claim 1, characterized in that: The specialized equipment includes axial stirring single / double-shaft equipment, triaxial and multi-shaft equipment, or channel cutting TRD equipment, or radial cutting double-wheel milling CSM equipment.

3. The composite vertical seepage interception system of cement-soil pile wall and plastic-steel sheet pile according to claim 1, characterized in that: The pile planting equipment uses a resonance-free hammer or a static pressure pile planting machine.

4. The composite vertical seepage interception system of cement-soil pile wall and plastic-steel sheet pile according to claim 1, characterized in that: The length of the plastic steel sheet pile exposed above the cement-soil pile wall shall not be less than 50cm.

5. The construction method of the composite vertical seepage interception system of cement-soil pile wall and plastic-steel sheet pile according to any one of claims 1 to 4, characterized in that: Includes the following steps: S1. Pre-mixing or pre-grooving to form cement-soil pile walls; Specialized equipment is used to pre-mix or pre-trench to form cement-soil pile walls; S2. Insert the plastic steel sheet piles into the cement-soil pile wall; Before the cement-soil pile wall sets, plastic steel sheet piles are inserted into the cement-soil pile wall using a non-resonant hammer or static pressure pile driver; the bottom of the plastic steel sheet pile is flush with the bottom surface of the cement-soil pile wall, and the top protrudes from the top surface of the cement-soil pile wall. S3. Level and clean the top surface of the cement-soil pile wall; Remove laitance, debris and oil stains from the top surface of the cement-soil pile wall. After roughening, ensure the flatness meets construction requirements. After cleaning, the top surface of the cement-soil pile wall should be moist but without standing water. S4. Install rubber waterstop strips on both sides of the plastic steel sheet pile and fix them with through steel nails; S5. After casting the vertical formwork and cutting off seepage, a water-stop copper plate is pre-embedded at the top of the casting joint; S6. Apply a flexible waterproofing material layer to the outside of the joint after seepage interception; S7. Simultaneously pour concrete toothed sills and the bottom slab of water-related buildings to form a seepage interception and sealing system.

6. The construction method of the composite vertical seepage interception system of cement-soil pile wall and plastic steel sheet pile according to claim 5, characterized in that: In step S1, the special equipment is a single or double-shaft axial mixing device, a triaxial or multi-shaft mixing device, or a TRD cutting device for channel cutting, or a CSM cutting device for radial cutting with double milling wheels. If the foundation soil layer is soft soil, 0-5% of the mass of the mixed soil is added as a curing agent, and the curing agent is SN201-A. If the foundation soil layer is silty sand, 0-10% of the mass of the mixed soil is added as a curing agent, and the curing agent is bentonite.

7. The construction method of the composite vertical seepage interception system of cement-soil pile wall and plastic steel sheet pile according to claim 5, characterized in that: In step S2, the length of the plastic steel sheet pile exposed above the cement-soil pile wall is not less than 50cm.

8. The construction method of the composite vertical seepage interception system of cement-soil pile wall and plastic steel sheet pile according to claim 5, characterized in that: In step S3, the flatness deviation is ≤5mm; the top surface of the cement-soil pile wall is coated with an interface agent or laid with a grouting layer.

9. The construction method of the composite vertical seepage interception system of cement-soil pile wall and plastic-steel sheet pile according to claim 5, characterized in that: In step S4, the perforation of the through nail is bonded by vulcanized heat bonding or waterproof adhesive. After fixing, check and ensure that the rubber waterstop strip is not displaced or damaged and that the nail is not loose. If necessary, waterproof sealant is used to seal the nail hole and joint gap a second time.

10. The construction method of the cement-soil pile wall and plastic-steel sheet pile composite vertical seepage interception system according to claim 5, characterized in that: In step S5, the concrete index of the post-interception joint is not less than C30F50; the water-stop copper sheet is made of T2 copper with a copper content ≥99.9%, a thickness of 2mm, a tensile strength ≥200MPa, and an elongation ≥30%; in step S6, the flexible water-stop material layer is made of No. 10 asphalt.

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