CN108118684B - Beach reclamation dredger fill silt sand inclusion layer foundation reinforcing structure and construction method - Google Patents
Beach reclamation dredger fill silt sand inclusion layer foundation reinforcing structure and construction method Download PDFInfo
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- CN108118684B CN108118684B CN201711213048.0A CN201711213048A CN108118684B CN 108118684 B CN108118684 B CN 108118684B CN 201711213048 A CN201711213048 A CN 201711213048A CN 108118684 B CN108118684 B CN 108118684B
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/02—Improving by compacting
- E02D3/10—Improving by compacting by watering, draining, de-aerating or blasting, e.g. by installing sand or wick drains
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D19/00—Keeping dry foundation sites or other areas in the ground
- E02D19/06—Restraining of underground water
- E02D19/12—Restraining of underground water by damming or interrupting the passage of underground water
- E02D19/18—Restraining of underground water by damming or interrupting the passage of underground water by making use of sealing aprons, e.g. diaphragms made from bituminous or clay material
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/02—Improving by compacting
- E02D3/08—Improving by compacting by inserting stones or lost bodies, e.g. compaction piles
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- E—FIXED CONSTRUCTIONS
- E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
- E02D—FOUNDATIONS; EXCAVATIONS; EMBANKMENTS; UNDERGROUND OR UNDERWATER STRUCTURES
- E02D3/00—Improving or preserving soil or rock, e.g. preserving permafrost soil
- E02D3/11—Improving or preserving soil or rock, e.g. preserving permafrost soil by thermal, electrical or electro-chemical means
Abstract
The invention relates to a foundation reinforcing structure of a sand inclusion layer of dredger fill silt for beach reclamation, which comprises the following components: spiral steel wire conductive drain pipe, solar power supply, double-row steel sheet pile, self-setting mortar impervious wall, self-setting mortar bearing plate, hydraulic filling silt layer, general soft soil layer and sand inclusion layer; the foundation of the hydraulic filling silt sand-inclusion layer sequentially comprises a hydraulic filling silt layer, a general soft soil layer, a sand-inclusion layer and a general soft soil layer from top to bottom; the spiral steel wire conductive drain pipe comprises a conductive hose, a precast concrete pile tip and a high-elasticity spiral steel wire; high-elasticity spiral steel wires are embedded in the pipe wall of the conductive hose, and drain holes are formed in the whole body of the conductive hose. The beneficial effects of the invention are as follows: the construction working face is formed quickly, so that time is saved and efficiency is high; solves the problem of air leakage of the sand inclusion layer, and can directly perform vacuum preloading; the multifunctional spiral steel wire conductive drain pipe promotes soil layer drainage and stabilizes the foundation; the energy consumption is low, the disassembly and the assembly are convenient, and the maintenance is easy; the conductive hose has high strength, good toughness and good conductivity.
Description
Technical Field
The invention belongs to the technical field of foundation treatment, and particularly relates to a beach reclamation dredger fill silt sand inclusion layer foundation reinforcing structure and a construction method, which are suitable for large-area soft foundation treatment, in particular to foundation reinforcing treatment of a dredger fill silt lower lying sand inclusion layer.
Background
At present, with the rapid development of coastal areas in China, the demand for land is greatly increased, and the common treatment method is a technology for land construction by using mud flat and hydraulic reclamation. However, since the new blow-filled mucky soil is generally "three high-low" (i.e., high water content, high compressibility, high sensitivity, low strength) mucky soil, when the blow-filling is completed, the water content is high, the strength is low, which is one of the most troublesome types in the current foundation treatment. In the construction of a silt area, personnel and mechanical equipment cannot enter the silt area, and the silt area becomes a bottleneck of the whole engineering. In order to meet the construction conditions in the new hydraulic fill sludge region, the hydraulic fill sludge must be subjected to foundation stabilization.
The conventional methods commonly used for the hydraulic fill silt foundation treatment include a preloading method, a vacuum preloading technology, a flexible pile composite foundation method and the like. The typical trend of the development of the existing foundation treatment is to combine the reinforcement technology, i.e. combine more than one traditional foundation reinforcement technology, and the composite foundation treatment method is more effective than the single method in many research results. Different hydraulic filling silt foundation treatment methods have respective applicable characteristics and limitations due to different self-acting principles. For example, the vacuum electroosmosis preloading combined foundation reinforcement technology is a typical composite reinforcement technology which combines three foundation treatment methods, and solves the problem of combining electroosmosis with vacuum preloading and preloading, so that the three foundation treatment methods of electroosmosis, vacuum preloading and preloading are simultaneously carried out, and the method can greatly shorten the foundation treatment period and improve the treatment effect for a silt soft soil foundation with small permeability coefficient, but does not effectively solve the problems of insufficient bearing capacity of the upper part of hydraulic filling silt and sand inclusion. Moreover, the existing combined use of vacuum preloading and electroosmosis methods requires the use of vacuum membranes to seal the site, which are easily damaged by the electroosmosis system or upper part stacking to cause air leakage. In addition, if the compressed air vacuum preloading method is used for treating the dredging mud with extremely high water content and poor permeability, the effect is poor, the effective reinforcement depth is small, and the strength of a vertical drainage channel for pressing in gas is insufficient, so that huge pressure in the gas pressing-in process can not be met, and the material is broken, so that the actual drainage effect is influenced.
In summary, the existing technology for treating and reinforcing the foundation of the sand inclusion layer under the dredged fill sludge cannot effectively solve the problems of insufficient bearing capacity of the upper part of the dredged fill layer, air leakage of the sand inclusion layer under the dredged fill layer, easy damage to the vacuum film, difficult consolidation and drainage of the dredged fill sludge, poor material performance of the vertical drainage channel and the like, and the actual foundation reinforcing effect is difficult to be well ensured, so that the problem needs to be solved by providing a new technology.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provides a foundation reinforcing structure for a dredger fill silt sand inclusion layer for beach reclamation and a construction method.
Another object of the present invention is to provide a foundation stabilization structure for a beach reclamation dredger fill silt sand inclusion layer. The invention aims at realizing the following technical scheme:
this kind of beach reclamation hydraulic reclamation silt sand inclusion layer foundation stabilization structure includes: spiral steel wire conductive drain pipe, solar power supply, double-row steel sheet pile, self-setting mortar impervious wall, self-setting mortar bearing plate, hydraulic filling silt layer, general soft soil layer and sand inclusion layer; the foundation of the hydraulic filling silt sand-inclusion layer sequentially comprises a hydraulic filling silt layer, a general soft soil layer, a sand-inclusion layer and a general soft soil layer from top to bottom; the spiral steel wire conductive drain pipe comprises a conductive hose, a precast concrete pile tip and a high-elasticity spiral steel wire; the high-elasticity spiral steel wire is embedded in the pipe wall of the conductive hose, a drain hole is formed in the whole body of the conductive hose, the conductive hose is wrapped with filter cloth, the surface of the spiral steel wire conductive drain pipe penetrating through the sand inclusion section is wrapped with insulating adhesive tape, and a precast concrete pile tip is arranged at the bottom end of the spiral steel wire conductive drain pipe; the top of the hydraulic filling silt layer is provided with a self-setting mortar bearing plate, the periphery of the hydraulic filling silt layer foundation is provided with self-setting mortar impervious walls, and the self-setting mortar impervious walls are formed by enclosing double rows of steel sheet piles; the solar power supply is placed on the self-setting mortar bearing plate through the support, the high-elasticity spiral steel wires of the two adjacent spiral steel wire conductive drain pipes are respectively connected with the positive electrode and the negative electrode of the solar power supply through wires, the spiral steel wire conductive drain pipes connected with the positive electrode of the solar power supply are connected with the compression pump through the guide pipe, and the spiral steel wire conductive drain pipes connected with the negative electrode of the solar power supply are connected with the vacuum pump through the guide pipe.
As preferable: the outer diameter of the conductive hose is 30-50mm, and the wall thickness is 2-3 mm.
As a priority: the conductive hose is made of polyethylene, one of epoxy resin and acrylate resin, graphite, carbon black and at least one of copper, aluminum, zinc, iron or nickel powder, and the mass ratio is as follows: 1:0.1-0.2:0.2-0.3:0.05-0.1:0.1-0.2.
As preferable: the spacing between the high-elasticity spiral steel wires of each ring is 10-20 mm; the drain holes are arranged in a spiral manner, and the diameter of each drain hole is 1-2 mm; the maximum diameter of the precast concrete pile tip is 70-120mm.
As preferable: the spiral steel wire conductive drain pipe is inserted into the foundation of the hydraulic filling silt sand inclusion layer according to rectangular or regular triangle arrangement and reaches the foundation treatment depth, and the precast concrete pile tip is driven into a general soft soil layer at the lower part of the sand inclusion layer.
As preferable: the length of the double-row steel sheet piles is 0.5-1.0m higher than the hydraulic filling silt layer, the distance between the double-row steel sheet piles is 0.6-1.5 m, and the double-row steel sheet piles are inserted into a common soft soil layer at the lower part of the hydraulic filling silt layer.
As preferable: the solar power supply is positioned between two adjacent spiral steel wire conductive drain pipes.
As preferable: a row of guide pipes are arranged every 1-2m, one end of each guide pipe is sequentially connected with a compression pump and a vacuum pump, a spiral steel wire conductive drain pipe is arranged every 1-2m on each guide pipe, and the solar power supply is arranged between the two rows of guide pipes.
A construction method of a beach reclamation dredger fill silt sand inclusion layer foundation reinforcing structure comprises the following steps:
firstly, inserting double-row steel sheet piles around a foundation of a hydraulic filling silt sandwich layer, wherein the length of the double-row steel sheet piles higher than that of the hydraulic filling silt layer is 0.5-1.0m, and the distance between the double-row steel sheet piles is 0.6-1.5 m, and the double-row steel sheet piles are inserted into a general soft soil layer at the lower part of the hydraulic filling silt layer;
injecting self-setting mortar above the hydraulic filling silt layer, and setting the self-setting mortar into a self-setting mortar bearing plate;
thirdly, excavating self-setting mortar grooves between the double rows of steel sheet piles by a slurry retaining wall method, wherein the depth of the self-setting mortar grooves penetrates through the sand inclusion layer, the depth of the self-setting mortar grooves enters into a general soft soil layer at the lower part of the sand inclusion layer to be more than 1.0m, and self-setting mortar is poured into the self-setting mortar grooves to be set into a self-setting mortar impermeable wall;
step four, manufacturing a spiral steel wire conductive drain pipe, wrapping insulating adhesive tapes at corresponding positions of the spiral steel wire conductive drain pipe according to the depth of the sand inclusion layer, and arranging precast concrete pile tips at the bottom end of the spiral steel wire conductive drain pipe;
inserting the spiral steel wire conductive drain pipe into the sand-filled silt layer foundation by adopting a steel pipe pile sinking machine according to rectangular or regular triangle arrangement and reaching the designed foundation treatment depth;
step six, connecting high-elasticity spiral steel wires of the conductive drain pipes of the two adjacent spiral steel wires with the positive electrode and the negative electrode of a solar power supply respectively through wires, and placing the solar power supply on a self-hardening mortar bearing plate through a bracket;
step seven, connecting a spiral steel wire conductive drain pipe connected with the positive electrode of the solar power supply with a compression pump through a conduit, and connecting a spiral steel wire conductive drain pipe connected with the negative electrode of the solar power supply with a vacuum pump through a conduit;
starting a vacuum pump to perform vacuum drainage from the spiral steel wire conductive drain pipe to the outside of the foundation of the hydraulic filling silt sand inclusion layer; starting a compression pump to boost pressure in the foundation of the hydraulic filling silt sand inclusion layer from the spiral steel wire conductive drain pipe; starting a solar power supply;
and step nine, dismantling the solar power supply, the air pump and the vacuum pump at the upper part after the drainage treatment of the foundation of the hydraulic filling silt and sand inclusion layer is finished, reserving the spiral steel wire conductive drainage pipe in the foundation of the hydraulic filling silt and sand inclusion layer, connecting the spiral steel wire conductive drainage pipe with the grouting pump through a conduit, and injecting cement into the spiral steel wire conductive drainage pipe to form a flexible slender pile.
As a priority: in the first step, the length of the double-row steel sheet piles, which is higher than the hydraulic filling sludge layer, is 0.5-1.0m, and the distance between the double-row steel sheet piles is 0.6-1.5 m; in the second step, the thickness of the self-setting mortar injected above the hydraulic filling silt layer is 0.5-1.0 m.
The beneficial effects of the invention are as follows:
1) The construction working face is formed quickly, time is saved and efficiency is high
According to the construction method, the self-setting mortar bearing plate is formed by filling the self-setting mortar above the hydraulic filling silt layer, so that the problem that personnel and machinery cannot enter the silt foundation for construction is solved, and the time consumption for waiting for consolidation after the traditional hydraulic filling silt construction is greatly reduced.
2) Solves the problem of air leakage of the sand inclusion layer, and can directly perform vacuum preloading
The self-setting mortar impervious wall is built around the foundation pit by using double rows of steel sheet piles, self-setting mortar and the like, so that the air leakage problem of the sand inclusion foundation is effectively solved, and the problem that the cement or slurry stirring wall cannot be constructed on the silt foundation is solved. In addition, the self-setting mortar bearing plate and the self-setting mortar impervious wall form a closed space, a vacuum film adopted by conventional vacuum preloading is eliminated, and the vacuum preloading can be directly carried out in a foundation.
3) Multifunctional spiral steel wire conductive drain pipe for promoting soil layer drainage and stabilizing foundation
The spiral steel wire conductive drain pipes are inserted into the foundation of the hydraulic filling silt sand-inclusion layer according to rectangular or regular triangle arrangement and reach the designed foundation treatment depth. Adjacent two spiral steel wire conductive drain pipes are respectively connected with the anode and the cathode of a solar power supply and serve as an electroosmosis anode and a cathode to form an electroosmosis system; and then connecting the spiral steel wire conductive drain pipe connected with the anode of the solar power supply with a compression pump, and connecting the spiral steel wire conductive drain pipe connected with the cathode of the solar power supply with a vacuum pump to form an air extraction pressure system. When the electroosmosis system starts to work, electroosmosis flow is formed in the hydraulic filling silt sand-inclusion layer foundation, water molecules are promoted to flow from the anode to the cathode, and air compression improves the pore pressure difference in the hydraulic filling silt sand-inclusion layer foundation, improves the foundation drainage effect, and achieves the purpose of reducing the water content in the soil layer. In addition, when the grouting treatment of the hydraulic filling silt sand-inclusion layer foundation after the drainage is completed, a drainage channel is closed, meanwhile, an elongated flexible pile can be formed in the hydraulic filling silt sand-inclusion layer foundation, a pile-soil composite foundation is formed, and the bearing capacity of the hydraulic filling silt sand-inclusion layer foundation is improved.
4) Environment-friendly low energy consumption, convenient disassembly and assembly and easy maintenance
The energy required by the electroosmosis system between the adjacent spiral steel wire conductive drain pipes is provided by a solar power supply arranged between each pair of electrodes. The solar electroosmosis energy consumption is low, the environment is protected, and the cost caused by the corresponding electroosmosis energy consumption is reduced. In addition, the solar power supply is arranged on the self-setting mortar bearing plate, and is fixedly installed by using a bracket on the surface, so that the solar self-setting mortar bearing plate is convenient to disassemble in the later period, is beneficial to construction and maintenance, and is also beneficial to setting of changing the anode and the cathode.
5) The conductive hose has high strength, good toughness and good conductivity
The high-elasticity spiral steel wire embedded in the conductive hose can ensure that the spiral steel wire conductive drain pipe is not extruded or flattened in the air compressing or air extracting process, the embedded steel wire is conductive, the conductive effect of the conductive hose can be improved, and the high-elasticity spiral steel wire can improve the flexibility and strength of the spiral steel wire conductive drain pipe. The conductive hose is made of polyethylene, epoxy resin or acrylic resin, graphite, carbon black and one or more of copper, aluminum, zinc, iron or nickel powder, and has high strength, high toughness and good conductivity.
Drawings
FIG. 1 is a schematic vertical section of a beach reclamation dredger fill silt sand-lined foundation reinforcement structure;
FIG. 2 is a schematic illustration of grouting a spiral wire conductive drain pipe to form a grout pile;
FIG. 3 is a schematic view of the structure of a spiral wire conductive drain;
FIG. 4 is a schematic plan view of a solar electroosmotic drainage system;
reference numerals illustrate: a spiral steel wire conductive drain pipe 1; a tape 2; a filter cloth 3; a conductive hose 4; a drain hole 5; prefabricating a concrete pile tip 6; a high-elasticity spiral steel wire 7; a solar power supply 8; a wire 9; double-row steel sheet piles 10; self setting mortar barrier 11; a self setting mortar carrying board 12; a compression pump 13; a vacuum pump 14; a conduit 15; a grouting pump 16; a hydraulic filling sludge layer 17; a generally soft soil layer 18; sand inclusion layer 19; cement paste 20; a slurry permeation zone 21; a bracket 22.
Detailed Description
The invention is further described below with reference to examples. The following examples are presented only to aid in the understanding of the invention. It should be noted that it will be apparent to those skilled in the art that various modifications and adaptations of the invention can be made without departing from the principles of the invention and these modifications and adaptations are intended to be within the scope of the invention as defined in the following claims.
As shown in fig. 1 to 4, the beach reclamation hydraulic reclamation silt sand inclusion layer foundation reinforcing structure includes: the concrete grouting device comprises a spiral steel wire conductive drain pipe 1, a dielectric tape 2, a filter cloth 3, a conductive hose 4, a drain hole 5, a precast concrete pile tip 6, a high-elasticity spiral steel wire 7, a solar power supply 8, a wire 9, a double-row steel sheet pile 10, a self-setting mortar impervious wall 11, a self-setting mortar bearing plate 12, a compression pump 13, a vacuum pump 14, a conduit 15, a grouting pump 16, a blow-filled silt layer 17, a general soft soil layer 18, a sand inclusion layer 19, cement paste 20, a slurry penetration area 21 and a support 22. The hydraulic filling silt sand-lined foundation sequentially comprises a hydraulic filling silt layer 17, a general soft soil layer 18, a sand-lined layer 19 and a general soft soil layer 18 from top to bottom.
As shown in fig. 1 and 3, the spiral steel wire conductive drain pipe 1 comprises a insulating tape 2, a filter cloth 3, a conductive hose 4, a drain hole 5, a precast concrete pile tip 6 and a high-elasticity spiral steel wire 7. The outer diameter of the conductive hose 4 is 30-50mm, the wall thickness is 2-3mm, high-elasticity spiral steel wires 7 are embedded into the wall of the conductive hose 4, and the distance between every two rings of high-elasticity spiral steel wires 7 is 10-20mm. The whole body of the conductive hose 4 is provided with drain holes 5, the drain holes 5 are arranged in a spiral mode, the diameter of each drain hole 5 is 1-2mm, and one drain hole is arranged every 3mm. The conductive hose 4 is wrapped with the filter cloth 3, so that impurities in soil can be effectively filtered, and the drain hole 5 is prevented from being blocked. The bottom end of the spiral steel wire conductive drain pipe 1 is provided with a precast concrete pile tip 6, and the maximum diameter of the precast concrete pile tip 6 is 70-120mm. The spiral steel wire conductive drain pipe 1 is inserted into a sand inclusion layer foundation filled with silt according to rectangular or regular triangle arrangement and reaches the foundation treatment depth, the precast concrete pile tip 6 is driven into a general soft soil layer 18 at the lower part of the sand inclusion layer 19 to a certain depth, and the section surface of the spiral steel wire conductive drain pipe 1 penetrating through the sand inclusion layer 19 is coated with an insulating adhesive tape 2, so that the conductive hose 4 is insulated from the sand inclusion layer 19. The conductive hose 4 is made of polyethylene, epoxy resin or acrylic resin, graphite, carbon black and one or more of copper, aluminum, zinc, iron or nickel powder, and the mass ratio is as follows: 1:0.1-0.2:0.2-0.3:0.05-0.1:0.1:0.2.
As shown in fig. 1, the top of the hydraulic filling sludge layer 17 is provided with a self-setting mortar bearing plate 12, the periphery of the hydraulic filling sludge sand inclusion layer foundation is provided with a self-setting mortar impervious wall 11, the self-setting mortar impervious wall 11 is formed by enclosing double rows of steel sheet piles 10, the problem that the sludge foundation cannot be used for constructing cement or slurry stirring walls is effectively solved, and meanwhile, the self-setting mortar impervious wall 11 effectively solves the problem of air leakage of the sand inclusion layer 19. The length of the double-row steel sheet piles 10 which are higher than the hydraulic filling sludge layer 17 is 0.5-1.0m, the distance between the double-row steel sheet piles 10 is 0.6-1.5 m, and the double-row steel sheet piles 10 are inserted into a common soft soil layer 18 below the hydraulic filling sludge layer 17 to a certain depth. The solar power supply 8 is placed on the self-setting mortar bearing plate 12 through the support 22 and is positioned between two adjacent spiral steel wire conductive drain pipes 1, and the high-elasticity spiral steel wires 7 of the two adjacent spiral steel wire conductive drain pipes 1 are respectively connected with the positive electrode and the negative electrode of the solar power supply 8 through the lead 9 and serve as an electroosmosis anode and a electroosmosis cathode. The spiral steel wire conductive drain pipe 1 connected with the positive electrode of the solar power supply 8 is connected with the air pump 13, the spiral steel wire conductive drain pipe 1 connected with the negative electrode of the solar power supply 8 is connected with the vacuum pump 14, wherein the pressure of the air pump 13 is 0.5-1.0MPa, and the working air pressure of the vacuum pump 14 is 80-90KPa.
As shown in fig. 2, after the foundation drainage work of the hydraulic fill silt sandwich layer is completed, the spiral steel wire conductive drain pipe 1 and the grouting pump 16 are connected by the guide pipe 15, and cement slurry 20 is injected into the spiral steel wire conductive drain pipe 1 by the grouting pump 16. Because the spiral steel wire conductive drain pipe 1 is provided with the drain hole 5 on the whole body, cement mortar and surrounding soil body form a slurry permeation area 21, and a cement paste column is formed together, so that the effect of stabilizing foundation soil layers is achieved.
As shown in fig. 4, the solar electroosmotic drainage system is arranged in a flat layout. A row of guide pipes 15 are arranged at intervals of 1-2m, one end of each guide pipe 15 is sequentially connected with a compression pump 13 and a vacuum pump 14, and each guide pipe 15 is provided with a spiral steel wire conductive drain pipe 1 at intervals of 1-2m and connected by the guide pipe 15. A solar power supply 8 is arranged between the two rows of guide pipes 15, and the anode and the cathode of the solar power supply 8 are respectively connected with the spiral steel wire conductive drain pipes 1 at the two sides. When the electroosmosis drainage system starts to work, electroosmosis flow is formed in the sand inclusion layer foundation of the hydraulic filling sludge, and water molecules are promoted to flow from the anode to the cathode.
The construction method of the beach reclamation dredger fill silt sand inclusion layer foundation stabilization structure comprises the following steps:
firstly, inserting double-row steel sheet piles 10 around a foundation of a hydraulic filling silt sandwich layer, wherein the length of the double-row steel sheet piles 10 higher than the hydraulic filling silt layer 17 is 0.5-1.0m, the distance between the double-row steel sheet piles 10 is 0.6-1.5 m, and the double-row steel sheet piles 10 are inserted into a general soft soil layer 18 at the lower part of the hydraulic filling silt layer 17 to a certain depth;
injecting self-setting mortar with the thickness of 0.5-1.0m above the hydraulic filling sludge layer 17, and setting the self-setting mortar into a self-setting mortar bearing plate 12;
thirdly, excavating self-setting mortar grooves between the double rows of steel sheet piles 10 by a slurry retaining wall method, wherein the depth of the self-setting mortar grooves penetrates through the sand inclusion layer 19 and enters a general soft soil layer 18 at the lower part of the sand inclusion layer 19 to be more than 1.0m, and filling self-setting mortar into the self-setting mortar grooves to be set into a self-setting mortar impermeable wall 11;
step four, manufacturing a spiral steel wire conductive drain pipe 1, wrapping insulating adhesive tapes 2 at corresponding positions of the spiral steel wire conductive drain pipe 1 according to the depth of a sand inclusion layer 19, and arranging a precast concrete pile tip 6 at the bottom end of the spiral steel wire conductive drain pipe 1;
fifthly, inserting the spiral steel wire conductive drain pipe 1 into a sand-filled silt layer foundation by adopting a steel pipe pile sinking machine according to rectangular or regular triangle arrangement and reaching the designed foundation treatment depth;
step six, the high-elasticity spiral steel wires 7 of the two adjacent spiral steel wire conductive drain pipes 1 are respectively connected with the positive electrode and the negative electrode of the solar power supply 8 through wires 9, and serve as an electroosmosis anode and a electroosmosis cathode, and the solar power supply 8 is placed on the self-hardening mortar bearing plate 12 through a bracket 22;
step seven, the spiral steel wire conductive drain pipe 1 connected with the positive electrode of the solar power supply 8 is connected with the air pump 13, and the spiral steel wire conductive drain pipe 1 connected with the negative electrode of the solar power supply 8 is connected with the vacuum pump 14;
step eight, starting a vacuum pump 14 to perform vacuum drainage from the spiral steel wire conductive drain pipe 1 to the outside of the foundation of the hydraulic filling silt sand inclusion layer;
step nine, starting a compression pump 13 to boost pressure in the foundation of the hydraulic filling silt sand-inclusion layer from the spiral steel wire conductive drain pipe 1, and increasing the pore water pressure difference between the anode and the cathode;
step ten, starting a solar power supply 8, wherein a row of spiral steel wire conductive drain pipes 1 are used as anodes, and an adjacent row of spiral steel wire conductive drain pipes 1 are used as cathodes, so that electroosmotic flow is formed in a sand inclusion layer foundation of the hydraulic filling sludge, and water molecules are promoted to flow from the anodes to the cathodes;
and step eleven, removing the upper solar power supply 8, the air pump 13 and the vacuum pump 14 after the drainage treatment of the foundation filled with the silt and sand layers is completed, reserving the spiral steel wire conductive drain pipe 1 in the foundation filled with the silt and sand layers, and connecting the spiral steel wire conductive drain pipe 1 with the grouting pump 16 through the guide pipe 15 to inject cement 20 into the spiral steel wire conductive drain pipe 1 to form a flexible slender pile.
Claims (8)
1. The utility model provides a beach reclamation hydraulic reclamation silt sand inclusion layer ground reinforced structure which characterized in that includes: the solar energy self-solidifying mortar water-proof device comprises a spiral steel wire conductive drain pipe (1), a solar energy power supply (8), double-row steel sheet piles (10), a self-solidifying mortar water-proof wall (11), a self-solidifying mortar bearing plate (12), a hydraulic filling silt layer (17), a general soft soil layer (18) and a sand inclusion layer (19); the hydraulic filling silt sand inclusion layer foundation sequentially comprises a hydraulic filling silt layer (17), a general soft soil layer (18), a sand inclusion layer (19) and a general soft soil layer (18) from top to bottom; the spiral steel wire conductive drain pipe (1) comprises a conductive hose (4), a precast concrete pile tip (6) and a high-elasticity spiral steel wire (7); high-elasticity spiral steel wires (7) are embedded in the pipe wall of the conductive hose (4), drain holes (5) are formed in the whole body of the conductive hose (4), filter cloth (3) is wrapped outside the conductive hose (4), insulating adhesive tapes (2) are wrapped on the surface of the section of the spiral steel wire conductive drain pipe (1) penetrating through the sand inclusion layer (19), and precast concrete pile tips (6) are arranged at the bottom end of the spiral steel wire conductive drain pipe (1); the top of the hydraulic filling silt layer (17) is provided with a self-setting mortar bearing plate (12), the periphery of the hydraulic filling silt sand inclusion layer foundation is provided with a self-setting mortar impervious wall (11), and the self-setting mortar impervious wall (11) is surrounded by double rows of steel sheet piles (10); the solar power supply (8) is placed on the self-setting mortar bearing plate (12) through a bracket (22), high-elasticity spiral steel wires (7) of two adjacent spiral steel wire conductive drain pipes (1) are respectively connected with the positive electrode and the negative electrode of the solar power supply (8) through wires (9), the spiral steel wire conductive drain pipe (1) connected with the positive electrode of the solar power supply (8) is connected with the compression pump (13) through a conduit (15), and the spiral steel wire conductive drain pipe (1) connected with the negative electrode of the solar power supply (8) is connected with the vacuum pump (14) through the conduit (15); the outer diameter of the conductive hose (4) is 30-50mm, and the wall thickness is 2-3 mm; the conductive hose (4) is made of at least one of polyethylene, epoxy resin or acrylate resin, graphite, carbon black and copper, aluminum, zinc, iron or nickel powder, and the mass ratio is as follows: 1:0.1-0.2:0.2-0.3:0.05-0.1:0.1-0.2.
2. The beach reclamation hydraulic reclamation silt sand inclusion layer foundation stabilization structure of claim 1, wherein: the space between each ring of high-elasticity spiral steel wires (7) is 10-20 mm; the drain holes (5) are spirally arranged, and the diameter of the drain holes (5) is 1-2 mm; the maximum diameter of the precast concrete pile tip (6) is 70-120mm.
3. The beach reclamation hydraulic reclamation silt sand inclusion layer foundation stabilization structure of claim 1, wherein: the spiral steel wire conductive drain pipe (1) is inserted into a sand inclusion layer foundation of hydraulic filling sludge according to rectangular or regular triangle arrangement and reaches the foundation treatment depth, and the precast concrete pile tip (6) is driven into a general soft soil layer (18) at the lower part of the sand inclusion layer (19).
4. The beach reclamation hydraulic reclamation silt sand inclusion layer foundation stabilization structure of claim 1, wherein: the length of the double-row steel sheet piles (10) higher than the hydraulic filling silt layer (17) is 0.5-1.0m, the distance between the double-row steel sheet piles (10) is 0.6-1.5 m, and the double-row steel sheet piles (10) are inserted into a general soft soil layer (18) at the lower part of the hydraulic filling silt layer (17).
5. The beach reclamation hydraulic reclamation silt sand inclusion layer foundation stabilization structure of claim 1, wherein: the solar power supply (8) is positioned between two adjacent spiral steel wire conductive drain pipes (1).
6. The beach reclamation hydraulic reclamation silt sand inclusion layer foundation stabilization structure of claim 1, wherein: a row of guide pipes (15) are arranged every 1-2m, one end of each guide pipe (15) is sequentially connected with a compression pump (13) and a vacuum pump (14), a spiral steel wire conductive drain pipe (1) is arranged every 1-2m on each guide pipe (15), and a solar power supply (8) is arranged between the two rows of guide pipes (15).
7. The construction method of the beach reclamation hydraulic reclamation silt sand inclusion layer foundation stabilization structure as claimed in claim 1, which is characterized by comprising the following steps:
firstly, inserting double-row steel sheet piles (10) around a foundation of a hydraulic filling silt sandwich layer, wherein the double-row steel sheet piles (10) are inserted into a general soft soil layer (18) at the lower part of the hydraulic filling silt layer (17);
injecting self-setting mortar above the hydraulic filling silt layer (17), and setting the self-setting mortar into a self-setting mortar bearing plate (12);
thirdly, excavating self-setting mortar grooves between the double-row steel sheet piles (10) through a slurry retaining wall method, wherein the depth of the self-setting mortar grooves penetrates through the sand inclusion layer (19), the depth of a general soft soil layer (18) at the lower part of the sand inclusion layer (19) reaches more than 1.0m, self-setting mortar is poured into the self-setting mortar grooves, and the self-setting mortar is set into a self-setting mortar impervious wall (11);
step four, manufacturing a spiral steel wire conductive drain pipe (1), wrapping insulating adhesive tapes (2) at corresponding positions of the spiral steel wire conductive drain pipe (1) according to the depth of a sand inclusion layer (19), and arranging precast concrete pile tips (6) at the bottom end of the spiral steel wire conductive drain pipe (1);
fifthly, inserting the spiral steel wire conductive drain pipe (1) into the sand-filled silt layer foundation by adopting a steel pipe pile sinking machine according to rectangular or regular triangle arrangement and reaching the designed foundation treatment depth;
step six, connecting high-elasticity spiral steel wires (7) of two adjacent spiral steel wire conductive drain pipes (1) with the positive electrode and the negative electrode of a solar power supply (8) respectively through wires (9), and placing the solar power supply (8) on a self-hardening mortar bearing plate (12) through a bracket (22);
step seven, a spiral steel wire conductive drain pipe (1) connected with the positive electrode of the solar power supply (8) is connected with a compression pump (13) through a conduit (15), and the spiral steel wire conductive drain pipe (1) connected with the negative electrode of the solar power supply (8) is connected with a vacuum pump (14) through the conduit (15);
starting a vacuum pump (14) to perform vacuum drainage from the spiral steel wire conductive drain pipe (1) to the outside of the foundation of the hydraulic filling silt sand inclusion layer; starting a compression pump (13) to pressurize the foundation of the hydraulic filling silt sand inclusion layer from the spiral steel wire conductive drain pipe (1); starting a solar power supply (8);
and step nine, dismantling the solar power supply (8), the compression pump (13) and the vacuum pump (14) at the upper part after the drainage treatment of the foundation of the hydraulic filling silt sand inclusion layer is completed, reserving the spiral steel wire conductive drainage pipe (1) in the foundation of the hydraulic filling silt sand inclusion layer, connecting the spiral steel wire conductive drainage pipe (1) with the grouting pump (16) through the guide pipe (15), and injecting cement slurry (20) into the spiral steel wire conductive drainage pipe (1) to form a flexible slender pile.
8. The construction method of the beach reclamation dredger fill silt sand inclusion layer foundation stabilization structure according to claim 7, wherein the construction method comprises the following steps: in the first step, the length of the double-row steel sheet piles (10) higher than the hydraulic filling sludge layer (17) is 0.5-1.0m, and the interval between the double-row steel sheet piles (10) is 0.6-1.5 m; in the second step, the self-setting mortar injected above the hydraulic filling silt layer (17) has a thickness of 0.5-1.0 m.
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| CN109826189B (en) * | 2019-01-28 | 2020-09-08 | 三峡大学 | Pile making device and method |
| CN111549885B (en) * | 2020-05-15 | 2021-04-30 | 矿冶科技集团有限公司 | Pipe head, and immersed pipe construction device and method in fine grain tailing pond |
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