Pile wall type soil-proofing structure and construction method thereof

Abstract

The application discloses a pile wall type soil-proof waterproof structure and a construction method thereof. The waterproof structure comprises a plurality of first pile wall combination bodies arranged at intervals and a plurality of second pile wall combination bodies arranged between two adjacent first pile wall combination bodies. The first pile wall combination body is formed by a first rectangular groove section and at least one first reinforcement cage arranged in the first rectangular groove section. A side of the first reinforcement cage near an edge of the first rectangular groove section of the first pile wall combination body is provided with an H-shaped steel as a joint. The second pile wall combination body is connected with the H-shaped steel of the adjacent first pile wall combination body to form a continuous waterproof structure. The first pile wall combination body and the second pile wall combination body are combined, and the H-shaped steel is used as a joint to form the continuous waterproof structure. Compared with a traditional bite cast-in-place pile, the waterproof structure reduces the construction precision requirement, reduces the number of piles and reduces the construction cost.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of building construction, in particular to a pile wall type soil prevention and water stop structure and a construction method thereof. BACKGROUND

[0002] In the field of deep foundation engineering, with the continuous advancement of urban construction, the development and utilization of underground space are increasing, and the scale and complexity of deep foundation engineering are also increasing. As a key component of deep foundation engineering, the performance of the supporting structure is directly related to the safety and stability of the entire project. An effective supporting structure not only ensures the safety of buildings, roads, and underground pipelines around the foundation pit, but also creates favorable conditions for construction within the foundation pit, thereby ensuring the smooth progress of the entire project. Therefore, developing high-performance and reliable supporting structures has always been a research focus and development direction in the field of deep foundation engineering.

[0003] In previous deep foundation engineering, various technical means have been adopted to achieve the purpose of soil retention and water stop. The traditional water stop curtain between piles is one of the more common ways, which prevents the infiltration of groundwater by setting a water stop structure between the piles. The interlocking bored pile is also a commonly used supporting form, which uses plain concrete piles and reinforced concrete piles to overlap and interlock with each other to form a continuous underground wall, thereby achieving the functions of soil retention and water stop. Compared with the traditional water stop curtain between piles, the interlocking bored pile generally performs better in terms of water stop performance and construction reliability. In addition, some other supporting structures and water stop measures, such as underground continuous walls, have also been applied in different engineering scenarios.

[0004] However, the existing supporting structures and construction methods have many problems. As for the interlocking bored pile, the construction precision requirement is extremely high, and the verticality and position deviation of the pile must be strictly controlled to ensure effective interlocking between the piles. Any mistake will result in water stop failure and form a leakage channel. Moreover, the construction efficiency is low, as the number of interlocking piles is large and the density is high, requiring batch construction. The reinforced concrete pile of the latter construction needs to be drilled after the initial setting of the plain concrete pile of the former construction, which greatly reduces the construction efficiency. At the same time, the drilling and cutting operations during construction produce strong noise and vibration, causing significant disturbance to the environment in urban central areas. In addition, the large number of piles and low efficiency directly lead to increased mechanical and labor costs, resulting in high overall project costs. SUMMARY

[0005] To solve the technical problems in the prior art, the present application provides a pile wall type soil prevention and water stop structure and a construction method thereof.

[0006] The pile wall type soil prevention and water stop structure and the construction method thereof provided by the present application adopt the following technical solutions:

[0007] A pile wall type soil-proofing structure and a construction method thereof, comprising:

[0008] a plurality of first pile wall combinations arranged at intervals, each of the first pile wall combinations being formed by pouring concrete into a first rectangular groove segment and at least one first reinforcement cage arranged in the first rectangular groove segment, wherein one side of the first reinforcement cage of the first pile wall combination near an edge of the first rectangular groove segment is provided with an H-shaped steel as a joint;

[0009] a plurality of second pile wall combinations arranged between two adjacent first pile wall combinations, each of the second pile wall combinations being formed by pouring concrete into a second rectangular groove segment and at least one second reinforcement cage arranged in the second rectangular groove segment, and the second pile wall combination being connected with the H-shaped steel of the adjacent first pile wall combination to form a continuous soil-proofing structure.

[0010] In some embodiments, the two sides of the H-shaped steel are welded with a stopper iron sheet to prevent concrete from flowing around during pouring.

[0011] In some embodiments, the first reinforcement cage and the second reinforcement cage are each composed of a longitudinal main reinforcement, a spiral stirrup and a reinforcing stirrup arranged around the main reinforcement.

[0012] In some embodiments, the two sides of the H-shaped steel are welded with a retreat stopper plate.

[0013] In some embodiments, the first pile wall combination or the second pile wall combination is divided into at least two functional zones in a vertical direction, a lower pressure-bearing water-proofing zone at a lower part and an upper permeation purification zone at an upper part.

[0014] At least one embedded intelligent functional module is prearranged in the lower pressure-bearing water-proofing zone, the embedded intelligent functional module being located at a position in contact with a stratum containing corrosive substances to a reinforced concrete structure, and including a module box, a sensor for detecting the content of the corrosive substances and a nozzle for spraying clean water, the sensor and the nozzle being installed in the module box, and a plurality of through holes being provided on a side wall of the module box close to the stratum.

[0015] At least one embedded rainwater filtering and collecting module is prearranged in the upper permeation purification zone, the embedded rainwater filtering and collecting module including a collecting box for collecting rainwater infiltrated through soil and a water pump, an outlet of the water pump being communicated with an inlet of the nozzle via a pre-buried drainage pipeline.

[0016] The pile wall type soil-proofing structure further comprises a control system in communication connection with the sensor and the water pump, for starting the water pump to discharge the rainwater collected in the collecting box via the nozzle to dilute the corrosive substances when the sensor detects that the content of the corrosive substances exceeds a preset value.

[0017] In some embodiments, a one-way valve is arranged on the discharge pipe, which only allows fluid to flow downward.

[0018] In some embodiments, in the soil layer close to the embedded rainwater filtering and collecting module, a gravel layer, an activated carbon layer and a fine sand layer are arranged in sequence from top to bottom for multi-stage filtering of ground rainwater; the side wall of the collecting box in contact with the soil is densely provided with water inlet holes, and the inner cavity is divided into a first containing cavity close to the water inlet holes and a second containing cavity away from the water inlet holes by a partition plate, the partition plate is provided with filter holes, and the inlet of the water pump is in communication with the second containing cavity.

[0019] In some embodiments, the pile wall type soil-proof water stop structure further comprises a rainwater buffering mechanism, the rainwater buffering mechanism comprises a buffering box, a connecting pipe for connecting a plurality of the collecting boxes with each other, and a bidirectional water pump connected between one of the collecting boxes and the buffering box; wherein each of the collecting boxes is provided with a first water level sensor; the control system is further configured to control the bidirectional water pump to operate in a forward direction to pump rainwater in the collecting box into the buffering box when the first water level sensor detects that the water level is higher than a first preset water level, and to control the bidirectional water pump to operate in a reverse direction to supplement rainwater in the buffering box to the collecting box when the first water level sensor detects that the water level is lower than a second preset water level; the buffering box is further provided with a second water level sensor, and the buffering box is further in communication with a municipal pipeline system through a discharge pump.

[0020] In some embodiments, at least one closed sewage cavity is further divided in the collecting box; the module box body is further integrated with a pressure sensor and a water pump, wherein the pressure sensor is used to monitor the underground water pressure around the module in real time; the water pump is used to extract deep underground water; the pile wall type soil-proof water stop structure further comprises an upward pumping pipe for connecting the outlet of the water pump with the sewage cavity; the control system is further in communication connection with the pressure sensor and the water pump, and is used to start the water pump to discharge the underground water around the embedded intelligent functional module into the sewage cavity through the upward pumping pipe when the pressure sensor detects that the water pressure exceeds a preset pressure threshold;

[0021] The sewage cavities of a plurality of the collecting boxes are in communication with each other through connecting pipes; the pile wall type soil-proof water stop structure further comprises a sewage pumping assembly, the sewage pumping assembly is in communication with at least one of the sewage cavities, and is used to pump the sewage in the sewage cavity to an external sewage treatment facility.

[0022] The application also provides a construction method of the pile wall type soil-proof water stop structure for constructing the pile wall type soil-proof water stop structure, and comprises the following steps:

[0023] S1, along the designed water stop structure axis, a pair of parallel concrete guide walls are excavated and made on the ground;

[0024] S2, under the guidance of the concrete guide wall and the slot support, a first rectangular slot section is excavated by using a hydraulic trenching machine;

[0025] S3, a first circular hole for precisely positioning a first reinforcement cage is excavated at the bottom of the first rectangular slot section by using a rotary drilling rig at a predetermined interval;

[0026] S4, the first reinforcement cage is lowered into the first rectangular slot section, wherein the first reinforcement cage near the edge of the first rectangular slot section is pre-welded with H-shaped steel;

[0027] S5, concrete is poured in the first rectangular slot section to form a first pile wall combination;

[0028] S6, another first pile wall combination is formed by following the steps S1-S5 at an interval of one slot section;

[0029] S7, after the concrete of the adjacent first pile wall combinations reaches a predetermined strength, a second rectangular slot section between them is excavated under the guidance of the concrete guide wall, and the H-shaped steel is wall brushed to remove the surface mud skin;

[0030] S8, a second reinforcement cage is lowered into the second rectangular slot section, and concrete is poured to form a second pile wall combination connected with the H-shaped steel on both sides.

[0031] In summary, the present application includes at least one of the following beneficial technical effects:

[0032] 1. By combining the first pile wall combination and the second pile wall combination, and using H-shaped steel as a joint, a continuous water stop structure is formed. Compared with the traditional interlocking bored pile, it reduces the construction precision requirement and the water stop problem caused by mistakes in the construction process. At the same time, due to the use of rectangular slot section and reinforcement cage structure, the construction efficiency is higher, and it is not necessary to strictly control the pile forming time in batches like interlocking bored pile. Moreover, this structure reduces the drilling and cutting operations, reduces the impact of noise and vibration on the environment, and reduces the number of piles, reduces the cost of machinery and labor, and has obvious advantages in water stop performance, construction cost, environmental impact, etc.;

[0033] 2. By welding a stop plate on both sides of the H-shaped steel, the shear strength of the structure is improved. In actual engineering, the soil around the deep foundation pit may displace, thereby generating shear force on the pile wall type soil stop structure. The presence of the stop plate prevents the second pile wall combination from separating from the first pile wall combination, ensuring the integrity and stability of the structure, and further improving the reliability and safety of the entire structure;

[0034] 3. By vertically functionally partitioning the pile wall structure and linking with the intelligent system, active and closed-loop defense against chemical corrosion is realized. The embedded intelligent function module in the lower pressure water stop area continuously monitors the concentration of chemical substances in the corrosive soil layer in contact with the structure through its internal sensors. The multi-stage filtration system in the upper layer of the permeable purification area purifies the infiltrated natural rainwater and stores the clean water in the collection tank of the embedded rainwater filtration and collection module. When the sensor detects that the concentration of corrosive substances exceeds the standard, the control system immediately starts the water pump in the collection tank to deliver the purified rainwater to the spray head of the lower module through the discharge pipeline to accurately dilute the corrosion source. This design seamlessly integrates environmental perception, resource recycling, risk warning and active intervention, and transforms the traditional static protection structure into a dynamic intelligent system that can self-regulate and repair according to environmental changes, thereby greatly improving the durability and full life cycle safety of the structure in complex chemical environments.

[0035] 4. By adding pressure sensors, water pumps, sewage cavities and linkage control systems, the structure of the present application can actively pump out groundwater to reduce the hydrostatic pressure on the structure when the water pressure of the deep soil is too high, ensuring the safety of the structure. At the same time, the system can work cooperatively with the rainwater purification and spraying system to replace the highly corrosive groundwater, i.e. pumping out harmful groundwater while injecting purified rainwater, thereby fundamentally improving the chemical environment around the structure and further prolonging the service life of the structure. BRIEF DESCRIPTION OF DRAWINGS

[0036] Figure 1 is a structural schematic diagram of the pile wall type soil water stop structure provided by embodiment 1 of the present application;

[0037] Figure 2 is an exploded structural schematic diagram of the second pile wall combination in Figure 1

[0038] Figure 3 is an exploded structural schematic diagram of the first pile wall combination in Figure 1

[0039] Figure 4 is a structural schematic diagram of the H-shaped steel provided with a stop plate according to embodiment 2 of the present application;

[0040] Figure 5 is a structural schematic diagram of the first pile wall combination in Figure 1

[0041] Figure 6 is a structural schematic diagram of the reinforcement cage provided by the present application;

[0042] Figure 7 is a structural schematic diagram of the H-shaped steel provided with a stop plate according to embodiment 2 of the present application; ​​​

[0043] Figure 8 is Figure 7 an enlarged schematic view of part A in FIG. 1;

[0044] Figure 9 is a schematic view of the cross-sectional structure of the intelligent system provided in Embodiment 3 of the present application;

[0045] Figure 10 is Figure 9 an enlarged schematic view of part C in FIG. 1;

[0046] Figure 11 is Figure 9 an enlarged schematic view of part D in FIG. 1;

[0047] Figure 12 is Figure 9 a cross-sectional view of part B-B in FIG. 1;

[0048] Figure 13 is Figure 12 an enlarged schematic view of part E in FIG. 1;

[0049] Figure 14 is Figure 12 a schematic view of the internal structure of the rainwater buffering mechanism in FIG. 1;

[0050] Explanation of reference numerals: 1, first pile-wall combination; 11, first rectangular slot section; 12, first steel reinforcement cage; 121, main reinforcement; 122, spiral stirrup; 123, reinforcing stirrup; 2, second pile-wall combination; 21, second rectangular slot section; 22, second steel reinforcement cage; 3, H-shaped steel; 31, grout stopping iron sheet; 32, retreat stopping plate; 4, embedded intelligent functional module; 41, module box body; 42, sensor; 43, spray head; 44, pressure sensor; 45, water pumping pump; 5, embedded rainwater filtering and collecting module; 51, collecting box; 511, partition plate; 512, first containing cavity; 513, second containing cavity; 514, sewage cavity; 52, water pump; 53, first water level sensor; 6, multi-stage filtering system; 61, sand and gravel layer; 62, activated carbon layer; 63, fine sand layer; 7, discharge pipeline; 71, one-way valve; 8, rainwater buffering mechanism; 81, buffering box; 82, connecting pipe; 83, bidirectional water pump; 831, first water valve; 84, second water level sensor; 85, discharge pump; 851, second water valve; 9, upward pumping pipeline; 10, sewage pumping assembly; L1, stratum with corrosive substances. DETAILED DESCRIPTION

[0051] With reference to the drawings, the technical solutions in the embodiments of the present application will be further described in detail. The described embodiments are only possible technical implementations of the present application, but the present application is not limited to this. Other embodiments obtained by those of ordinary skill in the art without creative effort based on the embodiments of the present application are within the protection scope of the present application.

[0052] The present application mainly adopts pile walls to form a continuous water stop structure, so that the construction efficiency is improved, the cost is reduced, and the environmental protection effect is achieved. The present application will be further described in detail as follows.

[0053] Embodiment 1

[0054] Please refer to Figures 1-6 The pile wall type soil-proof water stop structure provided by the embodiments of the present application comprises a plurality of first pile wall combination bodies 1 arranged at intervals and a plurality of second pile wall combination bodies 2 arranged between adjacent two first pile wall combination bodies 1. The first pile wall combination body 1 and the second pile wall combination body 2 are connected through an H-shaped steel 3 to form a continuous water stop structure. This structure is more reliable in water stopping because the continuous structure reduces the possibility of leakage. Compared with the traditional bite cast-in-place pile, the construction process does not need to strictly control the verticality and position deviation of the pile as the bite cast-in-place pile does, so that the water stop failure caused by construction precision problems can be effectively avoided.

[0055] Specifically, please refer to Figures 1-6 The first pile wall combination body 1 is formed by pouring concrete into a first rectangular groove section 11 and at least one first steel reinforcement cage 12 arranged in the first rectangular groove section 11. The first steel reinforcement cage 12 is composed of a main reinforcement 121 arranged longitudinally, a spiral stirrup 122 arranged around the main reinforcement 121, and a reinforcing stirrup 123. The main reinforcement 121 generally adopts high-strength steel, and is arranged longitudinally to provide the main load-bearing capacity of the pile wall combination body. The spiral stirrup 122 is arranged around the outside of the main reinforcement 121, and has a spiral shape to enhance the integrity of the steel reinforcement cage and prevent the main reinforcement 121 from being displaced under stress. The reinforcing stirrup 123 further reinforces the structure of the steel reinforcement cage to make the steel reinforcement cage more stable. In addition to the above structural components, the main reinforcement 121 can also be made of a composite material under some special geological conditions, as long as the load-bearing and durability requirements are met. The spiral stirrup 122 and the reinforcing stirrup 123 can also be made of corrosion-resistant materials such as stainless steel according to actual conditions. During installation, the main reinforcement 121 is first placed at a predetermined interval and position, then the spiral stirrup 122 is wound around the main reinforcement 121 and fixed by welding or binding. The reinforcing stirrups 123 are arranged at intervals, and are also fixedly connected with the main reinforcement 121 and the spiral stirrup 122.

[0056] The H-shaped steel 3 is provided on one side of the first reinforcement cage 12 near the edge of the first rectangular slot section 11 of the first pile wall combination 1 as a joint. The H-shaped steel 3 has good strength and stability, and is suitable as a connecting component. The H-shaped steel 3 is welded on both sides with a stop grouting sheet 31, which is usually made of thin steel plate. The stop grouting sheet 31 prevents concrete from flowing around to areas that should not be filled during concrete pouring, ensuring the quality of concrete pouring. In some cases where the sealing requirement is higher, the stop grouting sheet 31 can be welded on both sides of the H-shaped steel 3 in a multi-layer stacked manner.

[0057] Specifically, please refer to Figures 1-6 The second pile wall combination 2 is formed by pouring concrete into the second rectangular slot section 21 and at least one second reinforcement cage 22 arranged therein. The second reinforcement cage 22 is also composed of longitudinal main reinforcement 121, and spiral stirrups 122 and reinforcing stirrups 123 arranged around the main reinforcement 121, and has similar structure and function to the first reinforcement cage 12. The second pile wall combination 2 is connected with the H-shaped steel 3 of the adjacent first pile wall combination 1, and such a connection mode makes the entire structure a whole, better playing the role of water stop and soil retaining. When connecting, the connection between the H-shaped steel 3 and the second pile wall combination 2 should be tight, and generally a bonding agent can be applied on the surface of the H-shaped steel 3 to enhance the firmness of the connection.

[0058] The implementation principle of the embodiment is that the pile wall type soil and water stop structure of the embodiment forms a continuous water stop structure by the combination of the first pile wall combination 1 and the second pile wall combination 2, and uses the H-shaped steel 3 as a joint. Compared with the traditional interlocking bored pile, it reduces the construction precision requirement and the water stop problem caused by the mistake in the construction process. At the same time, due to the use of the structure of the rectangular slot section and the reinforcement cage, the construction efficiency is higher, and it is not necessary to strictly control the piling time in batches like the interlocking bored pile. Moreover, this structure reduces the drilling and cutting operations, reduces the impact of noise and vibration on the environment, and reduces the number of piles, reduces the mechanical use cost and labor cost, and has obvious advantages in water stop performance, construction cost, environmental impact, etc.

[0059] Embodiment 2

[0060] Please refer to Figures 7-8The difference between this embodiment and the above-mentioned embodiments is that the H-shaped steel 3 is welded with a retreat stop plate 32 on both sides. The retreat stop plate 32 is generally made of steel plate and is welded on both sides of the H-shaped steel 3. After the concrete in the second rectangular groove section 21 solidifies, it will be blocked by the retreat stop plate 32 and thus cannot move away from the first pile wall combination 1. The setting of the retreat stop plate 32 increases the shear strength between the first pile wall combination 1 and the second pile wall combination 2, making the entire structure more stable when subjected to shear force. In some large deep foundation pit projects, there may be a large horizontal shear force, and the role of the retreat stop plate 32 is more obvious.

[0061] The implementation principle of this embodiment is that, on the basis of the original pile wall type soil prevention and water stop structure, the retreat stop plate 32 is welded on both sides of the H-shaped steel 3 to improve the shear strength of the structure. In actual engineering, the soil around the deep foundation pit may displace, thereby generating shear force on the pile wall type soil prevention and water stop structure. The presence of the retreat stop plate 32 prevents the second pile wall combination 2 from separating from the first pile wall combination 1, ensuring the integrity and stability of the structure and further improving the reliability and safety of the entire structure.

[0062] Embodiment 3

[0063] Please refer to Figures 9-14 This embodiment is based on the existing pile wall type soil prevention and water stop structure and aims to solve a key technical problem that has long plagued the field of underground engineering: the chronic corrosion of concrete and internal steel bars by chemical substances in groundwater and soil, as well as the threat of deep groundwater pressure to the structure, which directly affects the safety and design service life of the structure. To this end, this embodiment proposes an innovative “zoned linkage, active defense” design concept, upgrading the traditional passive protection structure to an intelligent system that can actively sense environmental changes and protect itself. The core is to divide the pile wall combination into two regions in the vertical direction: the lower pressure-bearing water stop area in the lower part and the upper permeation purification area in the upper part.

[0064] Lower pressure-bearing water stop area: Construct an active corrosion and pressure monitoring and intervention system

[0065] Technical background: Underground concrete structures have long been subjected to complex chemical environmental erosion. Corrosive substances commonly found in groundwater are the main reason for the premature deterioration and reduced durability of structures. These substances mainly include:

[0066] Sulfate (SO4 2−Sulfate (SO42-): Sulfate ions in groundwater will react with cement hydration products in concrete (such as calcium hydroxide, and aluminate tri-calcium hydrate) to form gypsum (calcium sulfate dihydrate) or ettringite (calcium sulphoaluminate) with crystal water. These products will expand significantly in volume, generating huge crystallization pressure inside the concrete, leading to cracking, spalling, and strength reduction of the concrete.

[0067] Chloride (Cl − ): Chloride ions themselves have relatively light corrosion on concrete, but they have strong permeability, which can penetrate the protective layer of concrete to reach the surface of the internal steel bars. It will destroy the passivation film (a dense oxide protective layer) on the surface of the steel bars. Once the passivation film is destroyed, the steel bars will begin to rust rapidly. The volume of iron rust is much larger than that of iron, which will also generate huge expansion force, leading to cracking and spalling of concrete along the direction of steel bars.

[0068] Magnesium salt (Mg²⁺): Magnesium ions will react with calcium hydroxide in cement stone to form magnesium hydroxide with very low solubility, and also react with hydrated calcium silicate gel to destroy its cementing properties, leading to loss of structural strength and density of concrete, becoming soft. If it is magnesium sulfate, it has the dual damage of sulfate and magnesium salt.

[0069] Traditional protection methods are mostly passive, such as using special cement or adding protective layers, which cannot respond to dynamic changes in the environment.

[0070] The embodiment scheme: In order to realize active defense, at least one embedded intelligent functional module 4 is pre-installed in the lower pressure water stop area of the embodiment.

[0071] The module is arranged in contact with stratum L1 containing corrosive substances to reinforced concrete structures known through geotechnical investigation. Its specific configuration is as follows: the module body is a module box 41 with sufficient strength and durability, which integrates sensors 42, spray heads 43, pressure sensors 44 and water pumps 45 inside, wherein the primary role of the module box 41 is to provide a stable, protected microenvironment for internal precision components to prevent damage under concrete pouring and long-term water and soil pressure. The sensor 42 is used to monitor the concentration of corrosive chemicals in real time, and a high-precision chemical sensor that can accurately identify and quantify the concentration of specific chemical ions is used. Its selection is based on local water and soil analysis reports, focusing on monitoring the content of key corrosive substances such as sulfate, chloride and magnesium salt. The design of the through hole enables the sensor 42 to "detect" the soil and groundwater environment outside the module box 41, achieving in-situ and real-time monitoring. The spray head 43 is used to spray purified rainwater to dilute corrosive substances, and the atomizing spray head is preferred. The purpose is to efficiently spray clean water as a diluent when the intervention program is started, so that it can quickly and widely penetrate into the surrounding soil to achieve rapid dilution of the corrosive substance concentration with the lowest water consumption. The pressure sensor 44 is used to monitor the groundwater pressure around the module in real time; the water pump 45 is used to actively extract deep groundwater when necessary. In addition, the module box 41 is provided with a plurality of through holes on the side wall close to the stratum to ensure that the internal sensors 42, spray heads 43, pressure sensors 44 and water pumps 45 can interact with the external soil and groundwater environment.

[0072] Upper permeable purification zone: construction of sustainable rainwater purification, supply and sewage temporary storage system

[0073] Technical background: To achieve active dilution intervention of corrosive substances, a reliable, economical and high-quality water source is needed. Direct use of municipal tap water or groundwater rich in minerals may not be effective, introduce new impurities and increase costs. After purification, rainwater is a natural, low-mineralization "soft water" that is an ideal diluent. At the same time, collecting and using rainwater also conforms to the "sponge city" concept of modern urban construction, and has significant environmental value. In addition, when dealing with deep groundwater problems, a safe space is needed to temporarily store extracted groundwater that may contain high concentrations of corrosive substances, to avoid direct pollution of the upper clean water source or the surface environment.

[0074] Embodiment scheme: Based on the above considerations, at least one embedded rainwater filtration and collection module 5 is preinstalled in the upper permeable purification zone of the embodiment.

[0075] The module works in conjunction with a multi-stage filtration system 6. In the soil layer close to the module, there are, from top to bottom, a gravel layer 61, an activated carbon layer 62, and a fine sand layer 63. The module itself includes a collection tank 51 and a water pump 52, and the outlet of the water pump 52 is connected to the inlet of the nozzle 43 of the lower module through the pre-buried drainage pipe 7.

[0076] Design principles and details:

[0077] Multi-stage filtration system 6: This is an engineering measure to simulate the purification of water bodies in nature. The gravel layer 61 is used to filter out larger particles such as leaves and coarse sand carried by rainwater during infiltration; the activated carbon layer 62 uses its large specific surface area to efficiently adsorb dissolved organic matter, odors, and some pigments in water; the fine sand layer 63 serves as a fine filtration layer to further remove small suspended impurities.

[0078] Collection tank 51: Its side wall in contact with the soil is densely covered with water inlet holes, which facilitates the reception of filtered clean rainwater. Its inner cavity is divided into a first containing cavity 512 and a second containing cavity 513 by a partition plate 511 with filter holes, and an additional independent and sealed sewage cavity 514 is also provided, which is completely isolated from other parts and is used to receive and temporarily store deep groundwater pumped up by the lower water pump 45. This design constitutes a secondary settling and filtration system within the tank and an independent sewage temporary storage system: when the water flows through the first containing cavity 512, the remaining particles can further settle and pass through the filter holes into the second containing cavity 513, thereby ensuring that the water sucked by the water pump 52 is pure enough to prevent the water pump 52, the pipeline, and the lower precision nozzle 43 from being clogged.

[0079] System linkage and intelligent regulation and storage

[0080] The pile wall type soil prevention and water stop structure of the embodiment combines the upper and lower zones and the newly added pressure management function organically through a central control system, achieving intelligent response in multiple targets and multiple scenarios.

[0081] Chemical corrosion active dilution logic: The control system is communicatively connected with the sensor 42 of the lower module and the water pump 52 of the upper module. When the sensor 42 detects that the content of corrosive substances exceeds the preset safety threshold, the control system immediately starts the water pump 52 to deliver the purified rainwater collected in the upper collection tank 51 to the nozzle 43 of the lower module through the pre-buried drainage pipe 7 and discharge it, thereby targeting and diluting the corrosive substances in the target area and protecting the lower reinforced concrete structure.

[0082] Deep water pressure active regulation logic: the pressure sensor 44 of the lower module continuously monitors the water pressure on the structure. When the detected pressure value exceeds the preset threshold of the structure safety, the control system immediately starts the water pump 45 in the module box 41. The water pump 45 pumps the high-pressure underground water around the module up to the closed sewage chamber 514 in the upper collection box 51 through an additional upper pumping pipeline 9. This directly reduces the hydrostatic pressure on the key parts of the structure, ensuring the safety of the structure. The sewage chambers 514 of multiple collection boxes can be connected by pipelines to collect the pumped underground water. The system also provides a sewage pumping assembly 10 which is connected to the sewage chamber. When the water level in the sewage chamber reaches a certain height, the control system starts the sewage pumping assembly 10 to pump the "sewage" containing high concentration of corrosive substances or silt to the sewage treatment equipment on the ground or municipal sewage pipe network for centralized and harmless treatment.

[0083] Water pressure regulation and corrosion prevention coordination logic: the system can achieve more active and complete "underground water replacement" operation. When the sensor 42 detects that the concentration of corrosive substances exceeds the standard and the pressure sensor 44 shows that the water pressure is moderate, the control system can be operated in coordination: first, start the water pump 45 to pump out the "old water" containing high concentration of corrosive substances around the structure and discharge it into the sewage chamber 514; then, start the water pump 52 to inject purified "new water" (i.e. rainwater) through the spray head 43. Through this "pumping and supplementing" method, the water environment around the structure is actively replaced, fundamentally improving the chemical environment of the reinforced concrete.

[0084] System reliability guarantee: the discharge pipeline 7 is provided with a one-way valve 71 which is set to allow fluid to flow downward only. This key design can effectively prevent the backflow of external high-pressure underground water containing corrosive substances into the discharge pipeline 7 and the upper collection box 51 through the spray head 43 in the non-working state, ensuring the purity of the purified water source and the one-way and safe operation of the entire system.

[0085] Rainwater caching and intelligent regulation and storage: to cope with the uneven rainfall conditions, the system also includes a rainwater caching mechanism 8. The mechanism includes a large-capacity caching box 81, a connecting pipe 82 for connecting multiple collection boxes 51 to each other, and a bidirectional water pump 83 connected between a collection box 51 and the caching box 81.

[0086] Each collection box 51 is provided with a first water level sensor 53, and the caching box 81 is provided with a second water level sensor 84.

[0087] The control system has intelligent regulation and storage logic: when a certain collecting tank 51 has water level higher than the first preset water level due to heavy rain, the control system controls the bidirectional water pump 83 to run in the forward direction to pump the excess rainwater in the tank into the buffer tank 81 for storage; and in the dry season, if the water level of a certain collecting tank 51 is lower than the second preset water level, the control system controls the bidirectional water pump 83 to run in the reverse direction to supplement the rainwater stored in the buffer tank 81 to the collecting tank 51. Preferably, one end of the bidirectional water pump 83 is provided with a first water valve 831, which can close the water flow channel of the bidirectional water pump 83 when the bidirectional water pump 83 is not in use.

[0088] In addition, the buffer tank 81 is also connected with the municipal pipeline system through a discharge pump 85, which is used to safely discharge the excess water when the total water storage (detected by the second water level sensor 84) exceeds the system capacity in extreme rainfall weather. Preferably, one end of the discharge pump 85 is provided with a second water valve 851, which can close the water flow channel of the discharge pump 85 when the discharge pump 85 is not in use.

[0089] Summary of implementation principle: By vertically dividing the pile wall structure into functional zones and linking them with an intelligent system, active and closed-loop defense against chemical corrosion is achieved. The embedded intelligent functional module 4 located in the lower pressure water stop zone continuously monitors the concentration of chemical substances in the stratum L1 in contact with the structure through its internal sensor 42. The multi-stage filtration system 6 located in the upper layer of the permeable purification zone purifies the infiltrated natural rainwater and stores the clean water in the collecting tank 51 of the embedded rainwater filtration and collection module 5. When the sensor 42 detects that the concentration of corrosive substances exceeds the standard, the control system immediately starts the water pump 52 in the collecting tank 51 to deliver the purified rainwater to the spray head 43 of the lower module through the discharge pipeline 7 to accurately dilute the corrosion source. This design seamlessly integrates environmental perception, resource recycling, risk warning and active intervention, transforming the traditional static protective structure into a dynamic intelligent system that can self-adjust and repair according to environmental changes, thereby greatly improving the durability and full life cycle safety of the structure in complex chemical environments.

[0090] At the same time, by adding pressure sensing, deep water extraction, sewage temporary storage and discharge, and other functional modules, a leap from "passive defense" to "active management" is achieved. It not only can deal with chemical corrosion through dilution, but also can actively relieve pressure and replace water sources, simultaneously solving the two core problems of physical pressure and chemical corrosion.

[0091] Embodiment 4

[0092] For reference Figures 1-6 The construction method of the pile wall type soil water stop structure provided by the embodiments of the present application comprises the following steps:

[0093] S1, along the axis of the designed water stop structure, a pair of parallel concrete guide walls are excavated and made on the ground. The concrete guide wall plays an important guiding and positioning role in construction, providing an accurate position reference for the subsequent slot section excavation. When excavating, ensure that the depth and width of the excavation meet the design requirements, and the bottom surface is flat. When making concrete guide walls, first bind the steel bars, then install the formwork, and finally pour the concrete. On some soft soil foundations, the foundation may need to be reinforced to ensure the stability of the guide wall.

[0094] S2, under the guidance of the concrete guide wall and the slot support, the first rectangular slot section 11 is excavated using a hydraulic slotting machine. The hydraulic slotting machine has high efficiency and precision, and can excavate the rectangular slot section according to the design requirements. During the excavation process, the running speed and direction of the slotting machine should be controlled to avoid deviation of the slot section. At the same time, the mud and waste in the slot should be cleaned in time to ensure the stability of the slot wall.

[0095] S3, using a rotary drilling rig, first circular drill holes for accurately positioning the first steel reinforcement cage 12 are excavated at the bottom of the first rectangular slot section 11 at a predetermined interval. The rotary drilling rig can accurately drill circular drill holes, which provide accurate positions for the installation of the first steel reinforcement cage 12. When drilling, pay attention to control the depth and diameter of the drill hole to ensure that the first steel reinforcement cage 12 can be installed smoothly.

[0096] S4, the first steel reinforcement cage 12 is lowered into the first rectangular slot section 11, wherein the first steel reinforcement cage 12 near the edge of the first rectangular slot section 11 is pre-welded with H-shaped steel 3. When lowering the first steel reinforcement cage 12, ensure that the first steel reinforcement cage 12 is vertical and stable to avoid colliding with the slot wall. The welding of H-shaped steel 3 should be firm and the position should be accurate to facilitate the connection with the second pile wall combination 2 later.

[0097] S5, concrete is poured in the first rectangular slot section 11 to form the first pile wall combination 1. When pouring concrete, use appropriate pouring methods to ensure that the concrete can uniformly fill the slot section, and it should be vibrated and compacted to avoid defects such as honeycomb and pitted surface.

[0098] S6, at an interval of one slot section position, another first pile wall combination 1 is constructed according to the method of steps S1-S5. This interval construction method can avoid interference between adjacent slot sections and ensure construction quality.

[0099] S7, after the concrete of the adjacent first pile wall combination 1 reaches the predetermined strength, the second rectangular slot section 21 between them is excavated under the guidance of the guide wall, and the H-shaped steel 3 is brushed to remove the surface mud. Brushing is to ensure the connection quality of H-shaped steel 3 and the second pile wall combination 2, and after removing the mud, the connection can be more compact.

[0100] S8, lower the second reinforcement cage 22 in the second rectangular slot section 21, and pour concrete to form the second pile wall combination 2 connected with the H-shaped steel 3 on both sides. When pouring the concrete of the second rectangular slot section 21, attention should also be paid to the quality and process of pouring to ensure that the second pile wall combination 2 is tightly connected with the first pile wall combination 1 through the H-shaped steel 3.

[0101] The implementation principle of the embodiment is that the construction method of the embodiment gradually completes the construction of the pile wall type soil prevention and water stop structure through a series of orderly steps. From the preparation of the concrete guide wall, accurate positioning and guidance are provided for the entire construction process. Advanced equipment such as hydraulic trenching machines and rotary drilling rigs are used to improve construction efficiency and accuracy. The first pile wall combination 1 and the second pile wall combination 2 are constructed in steps, and are connected through the H-shaped steel 3 to ensure the continuity and stability of the structure. Compared with the traditional interlocking cast-in-place pile construction method, this method does not need to strictly control the verticality and position deviation of the pile as it does, and multiple slot sections can be prepared for construction at the same time, greatly improving the construction efficiency, reducing the construction time and cost, and being a more scientific and efficient construction method.

[0102] Embodiment 5

[0103] Please refer to Figures 1-14 , this embodiment is a further description of the specific construction and installation process of the intelligent pile wall type soil prevention and water stop structure disclosed in embodiment 3 based on the construction method described in embodiment 4. The core is to organically integrate the installation of intelligent function modules and supporting systems into the construction process of the pile wall structure.

[0104] In addition to the steps S1 to S8 in embodiment 4, the construction method also particularly includes the following key links:

[0105] (1) Pre-integration of modules and pipelines: Before performing steps S4 (lowering the first reinforcement cage 12) and step S8 (lowering the second reinforcement cage 22), the components of the intelligent system need to be integrated with the reinforcement cage to be lowered. Including:

[0106] Lower module installation: according to the accurate depth of the L1 stratum with corrosive substances determined by the geological survey report, the embedded intelligent function module 4 is firmly fixed at the corresponding position of the first reinforcement cage 12 or the second reinforcement cage 22, and the pressure sensor 44 and the water pump 45 are pre-installed in the module box 41. At the same time, the discharge pipeline 7 is connected with the nozzle 43 of the embedded intelligent function module 4 from bottom to top, the upper suction pipeline 9 is connected with the outlet of the water pump 45, and the discharge pipeline 7 is laid and fixed along the main reinforcement of the reinforcement cage, and the one-way valve 71 is pre-installed on the discharge pipeline 7.

[0107] Upper layer module installation: Fix the embedded rainwater filtration and collection module 5 on the upper part of the reinforcement cage in the predetermined area.

[0108] Pipeline layout: Lay and fix the pipelines connecting the outlet of the water pump 52 with the drainage pipeline 7 and the upper pumping pipeline 9, the connecting pipes 82 connecting each collection tank 51 with the rainwater storage mechanism 8, and the cable harness required by the sensors 42, pressure sensors 44, first water level sensors 53, second water level sensors 84, water pump 52, water suction pump 45, bidirectional water pump 83, and drainage pump 85 along the reinforcement cage, ensuring that they will not be displaced or damaged during the subsequent concrete pouring process.

[0109] (2) Construction of external systems: After the construction of the pile wall structure main body (i.e., the first pile wall combination 1 and the second pile wall combination 2) is completed, install the peripheral supporting systems. This includes:

[0110] Storage mechanism installation: In a suitable location near the foundation pit, excavate and place the storage tank 81 of the rainwater storage mechanism 8, and complete the connection between the storage tank 81 and the pre-arranged connecting pipes 82 of each collection tank 51, as well as the connection with the drainage pump 85 and the municipal pipeline system.

[0111] Filter system laying: During the backfilling operation of the foundation pit, in the soil near the upper permeation purification area, lay the fine sand layer 63, activated carbon layer 62, and gravel layer 61 in sequence from bottom to top, forming a multi-stage filtration system 6.

[0112] Sewage treatment system installation: Connect the sewage cavities 514 of each unit with each other through the pre-arranged pipelines. Install the sewage pumping assembly 10 at the designated location, connect it with the outlet pipeline of the sewage cavity, and connect the final discharge port of the sewage pumping assembly 10 with the designated sewage treatment equipment or municipal sewage pipeline network.

[0113] (3) System commissioning: After all the structural construction and equipment installation are completed, connect the lines of the sensors 42, pressure sensors 44, first water level sensors 53, second water level sensors 84, water pump 52, water suction pump 45, bidirectional water pump 83, drainage pump 85, and sewage pumping assembly 10 to the central control system, and connect the power supply. Finally, conduct a comprehensive joint commissioning of the entire intelligent anti-corrosion and rainwater storage system, test the accuracy of sensor readings, the responsiveness of water pumps and valves, and the correctness of control logic, to ensure that the system can enter an automatic stable operation state.

[0114] The construction method of the present embodiment realizes seamless docking of the intelligent system and the pile wall main structure by pre-integrating the intelligent modules during the reinforcement cage manufacturing stage and installing peripheral facilities in combination with subsequent procedures such as backfilling. This method can effectively ensure the final construction quality and functional realization of the intelligent pile wall type soil waterproof structure.

[0115] The specific embodiments of the present application described above are not meant to be limiting. Any other changes and modifications that one can make to the present application according to the technical concept thereof should be included within the scope of the present application.

Claims

1. A soil retaining and waterproofing structure of a sheet-pile type, characterized by comprising: The invention relates to a pile-wall type soil-proofing structure, comprising: a plurality of first pile-wall combinations (1) arranged at intervals, which are formed by pouring concrete into first rectangular groove sections (11) and at least one first reinforcement cage (12) arranged therein, wherein one side of the first reinforcement cage (12) of the first pile-wall combination (1) near the edge of the first rectangular groove section (11) is provided with an H-shaped steel (3) as a joint; a plurality of second pile-wall combinations (2) arranged between two adjacent first pile-wall combinations (1), which are formed by pouring concrete into second rectangular groove sections (21) and at least one second reinforcement cage (22) arranged therein, and which are connected with the H-shaped steel (3) of the adjacent first pile-wall combination (1) to form a continuous water-stop structure; the first pile-wall combination (1) or the second pile-wall combination (2) is divided into at least two functional areas in the vertical direction: a lower layer pressure-bearing water-stop area at the lower part and an upper layer permeation purification area at the upper part; at least one embedded intelligent functional module (4) is prearranged in the lower layer pressure-bearing water-stop area, which is located at a position in contact with a stratum (L1) containing corrosive substances to the steel reinforced concrete structure, and which comprises a module box (41), a sensor (42) for detecting the content of the corrosive substances, and a spray head (43) for spraying clean water, wherein the sensor (42) and the spray head (43) are both installed in the module box (41), and a plurality of through holes are provided on the side wall of the module box (41) near the stratum; at least one embedded rainwater filtration and collection module (5) is prearranged in the upper layer permeation purification area, which comprises a collection box (51) for collecting rainwater infiltrated through the soil and a water pump (52), wherein the outlet of the water pump (52) is communicated with the inlet of the spray head (43) through a pre-buried drainage pipeline (7); the pile-wall type soil-proofing structure further comprises a control system in communication connection with the sensor (42) and the water pump (52), which is used to start the water pump (52) to discharge the rainwater collected in the collection box (51) through the spray head (43) to dilute the corrosive substances when the sensor (42) detects that the content of the corrosive substances exceeds a preset value; at least one closed sewage cavity (514) is further separated in the collection box (51); the module box (41) is further integrated with a pressure sensor (44) and a water pumping pump (45), wherein the pressure sensor (44) is used to monitor the underground water pressure around the module in real time, and the water pumping pump (45) is used to pump deep underground water. The pile wall type soil-proof waterproof structure further comprises an upper pumping pipeline (9) for connecting the outlet of the water pump (45) with the sewage cavity (514); the control system is further connected with the pressure sensor (44) and the water pump (45) in communication, so as to start the water pump (45) to pump the underground water around the embedded intelligent function module (4) into the sewage cavity (514) through the upper pumping pipeline (9) when the pressure sensor (44) detects that the water pressure exceeds a preset pressure threshold; The sewage cavities (514) of a plurality of the collection boxes (51) are connected with each other through connecting pipelines; the pile wall type soil-proof waterproof structure further comprises a sewage pumping assembly (10) connected with at least one of the sewage cavities (514) for pumping the sewage in the sewage cavity (514) to an external sewage treatment facility.

2. The sheet-pile earth-retaining structure according to claim 1, wherein The H-shaped steel (3) is welded with a stop grouting iron sheet (31) on both sides to prevent concrete from flowing around during pouring.

3. The sheet-pile earth-retaining structure according to claim 1, wherein The first steel reinforcement cage (12) and the second steel reinforcement cage (22) are both composed of longitudinal main reinforcement (121), spiral stirrups (122) and reinforcing stirrups (123) arranged around the main reinforcement (121).

4. The sheet-pile earth-retaining structure according to claim 1, wherein The H-shaped steel (3) is welded with a stop plate (32) on both sides.

5. The sheet-pile earth-retaining structure according to claim 1, wherein A one-way valve (71) is arranged on the discharge pipeline (7), which only allows fluid to flow downward.

6. The sheet-pile earth-retaining structure according to claim 1, wherein In the soil layer close to the embedded rainwater filtering and collecting module (5), a gravel layer (61), an activated carbon layer (62) and a fine sand layer (63) are sequentially arranged from top to bottom for multi-stage filtering of ground rainwater; the side wall of the collection box (51) in contact with the soil is densely provided with water inlet holes, and the inner cavity is divided into a first containing cavity (512) close to the water inlet holes and a second containing cavity (513) away from the water inlet holes by a partition plate (511), the partition plate (511) is provided with filter holes, and the inlet of the water pump (52) is communicated with the second containing cavity (513).

7. The sheet-pile earth-retaining structure according to claim 1, wherein Further comprising a rainwater buffering mechanism (8), the rainwater buffering mechanism (8) comprises a buffering box (81), a connecting pipe (82) connecting a plurality of the collection boxes (51) with each other, and a bidirectional water pump (83) connected between one of the collection boxes (51) and the buffering box (81); wherein each of the collection boxes (51) is provided with a first water level sensor (53); the control system is further used for controlling the bidirectional water pump (83) to operate in a forward direction to pump rainwater in the collection box (51) into the buffering box (81) when the first water level sensor (53) detects that the water level is higher than a first preset water level, and to operate in a reverse direction to supplement rainwater in the buffering box (81) to the collection box (51) when the first water level sensor (53) detects that the water level is lower than a second preset water level; the buffering box (81) is further provided with a second water level sensor (84), and the buffering box (81) is further connected with a municipal pipeline system through a discharge pump (85).

8. A method of constructing a soil retaining and waterproofing structure of the sheet-pile type, characterized in that, The pile wall type soil-proofing structure is used for construction, and comprises the following steps: S1, along the axis of the designed water-proofing structure, a pair of parallel concrete guide walls are excavated and made on the ground; S2, a first rectangular slot section (11) is excavated by using a hydraulic slotting machine under the guidance of the concrete guide walls and with slotting support; S3, a rotary drilling machine is used to excavate first circular drill holes for precisely positioning a first reinforcing cage (12) at a predetermined interval on the slot bottom of the first rectangular slot section (11); S4, the first reinforcing cage (12) is lowered into the first rectangular slot section (11), wherein the first reinforcing cage (12) near the edge of the first rectangular slot section (11) is pre-welded with an H-shaped steel (3); S5, concrete is poured in the first rectangular slot section (11) to form a first pile wall combination (1); S6, another first pile wall combination (1) is constructed by following the steps S1-S5 at an interval of one slot section; S7, after the concrete of the adjacent first pile wall combinations (1) reaches a predetermined strength, a second rectangular slot section (21) between the two is excavated under the guidance of the concrete guide walls, and the H-shaped steel (3) is subjected to wall brushing treatment to remove the surface mud skin; S8, a second reinforcing cage (22) is lowered into the second rectangular slot section (21), and concrete is poured to form a second pile wall combination (2) connected with the H-shaped steels (3) on both sides.

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